diff --git a/crypto/Kconfig b/crypto/Kconfig index c5ef8cac60efa..a30d75997b7e2 100644 --- a/crypto/Kconfig +++ b/crypto/Kconfig @@ -220,6 +220,18 @@ config CRYPTO_AUTHENC Authenc: Combined mode wrapper for IPsec. This is required for IPSec. +config CRYPTO_KRB5ENC + tristate "Kerberos 5 combined hash+cipher support" + select CRYPTO_AEAD + select CRYPTO_SKCIPHER + select CRYPTO_MANAGER + select CRYPTO_HASH + select CRYPTO_NULL + help + Combined hash and cipher support for Kerberos 5 RFC3961 simplified + profile. This is required for Kerberos 5-style encryption, used by + sunrpc/NFS and rxrpc/AFS. + config CRYPTO_TEST tristate "Testing module" depends on m || EXPERT @@ -2148,5 +2160,6 @@ config CRYPTO_HASH_INFO source "drivers/crypto/Kconfig" source "crypto/asymmetric_keys/Kconfig" source "certs/Kconfig" +source "crypto/krb5/Kconfig" endif # if CRYPTO diff --git a/crypto/Makefile b/crypto/Makefile index b5a607a5b1f7f..b2e0488f2d69b 100644 --- a/crypto/Makefile +++ b/crypto/Makefile @@ -155,6 +155,7 @@ obj-$(CONFIG_CRYPTO_CRC32) += crc32_generic.o obj-$(CONFIG_CRYPTO_CRCT10DIF) += crct10dif_common.o crct10dif_generic.o obj-$(CONFIG_CRYPTO_CRC64_ROCKSOFT) += crc64_rocksoft_generic.o obj-$(CONFIG_CRYPTO_AUTHENC) += authenc.o authencesn.o +obj-$(CONFIG_CRYPTO_KRB5ENC) += krb5enc.o obj-$(CONFIG_CRYPTO_LZO) += lzo.o lzo-rle.o obj-$(CONFIG_CRYPTO_LZ4) += lz4.o obj-$(CONFIG_CRYPTO_LZ4HC) += lz4hc.o @@ -202,3 +203,5 @@ obj-$(CONFIG_ASYMMETRIC_KEY_TYPE) += asymmetric_keys/ obj-$(CONFIG_CRYPTO_HASH_INFO) += hash_info.o crypto_simd-y := simd.o obj-$(CONFIG_CRYPTO_SIMD) += crypto_simd.o + +obj-$(CONFIG_CRYPTO_KRB5) += krb5/ diff --git a/crypto/krb5/Kconfig b/crypto/krb5/Kconfig new file mode 100644 index 0000000000000..4d0476e13f3c7 --- /dev/null +++ b/crypto/krb5/Kconfig @@ -0,0 +1,26 @@ +config CRYPTO_KRB5 + tristate "Kerberos 5 crypto" + select CRYPTO_MANAGER + select CRYPTO_KRB5ENC + select CRYPTO_AUTHENC + select CRYPTO_SKCIPHER + select CRYPTO_HASH_INFO + select CRYPTO_HMAC + select CRYPTO_CMAC + select CRYPTO_SHA1 + select CRYPTO_SHA256 + select CRYPTO_SHA512 + select CRYPTO_CBC + select CRYPTO_CTS + select CRYPTO_AES + select CRYPTO_CAMELLIA + help + Provide a library for provision of Kerberos-5-based crypto. This is + intended for network filesystems to use. + +config CRYPTO_KRB5_SELFTESTS + bool "Kerberos 5 crypto selftests" + depends on CRYPTO_KRB5 + help + Turn on some self-testing for the kerberos 5 crypto functions. These + will be performed on module load or boot, if compiled in. diff --git a/crypto/krb5/Makefile b/crypto/krb5/Makefile new file mode 100644 index 0000000000000..d38890c0b2472 --- /dev/null +++ b/crypto/krb5/Makefile @@ -0,0 +1,18 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for asymmetric cryptographic keys +# + +krb5-y += \ + krb5_kdf.o \ + krb5_api.o \ + rfc3961_simplified.o \ + rfc3962_aes.o \ + rfc6803_camellia.o \ + rfc8009_aes2.o + +krb5-$(CONFIG_CRYPTO_KRB5_SELFTESTS) += \ + selftest.o \ + selftest_data.o + +obj-$(CONFIG_CRYPTO_KRB5) += krb5.o diff --git a/crypto/krb5/internal.h b/crypto/krb5/internal.h new file mode 100644 index 0000000000000..a59084ffafe86 --- /dev/null +++ b/crypto/krb5/internal.h @@ -0,0 +1,247 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* Kerberos5 crypto internals + * + * Copyright (C) 2025 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#include +#include +#include +#include + +/* + * Profile used for key derivation and encryption. + */ +struct krb5_crypto_profile { + /* Pseudo-random function */ + int (*calc_PRF)(const struct krb5_enctype *krb5, + const struct krb5_buffer *protocol_key, + const struct krb5_buffer *octet_string, + struct krb5_buffer *result, + gfp_t gfp); + + /* Checksum key derivation */ + int (*calc_Kc)(const struct krb5_enctype *krb5, + const struct krb5_buffer *TK, + const struct krb5_buffer *usage_constant, + struct krb5_buffer *Kc, + gfp_t gfp); + + /* Encryption key derivation */ + int (*calc_Ke)(const struct krb5_enctype *krb5, + const struct krb5_buffer *TK, + const struct krb5_buffer *usage_constant, + struct krb5_buffer *Ke, + gfp_t gfp); + + /* Integrity key derivation */ + int (*calc_Ki)(const struct krb5_enctype *krb5, + const struct krb5_buffer *TK, + const struct krb5_buffer *usage_constant, + struct krb5_buffer *Ki, + gfp_t gfp); + + /* Derive the keys needed for an encryption AEAD object. */ + int (*derive_encrypt_keys)(const struct krb5_enctype *krb5, + const struct krb5_buffer *TK, + unsigned int usage, + struct krb5_buffer *setkey, + gfp_t gfp); + + /* Directly load the keys needed for an encryption AEAD object. */ + int (*load_encrypt_keys)(const struct krb5_enctype *krb5, + const struct krb5_buffer *Ke, + const struct krb5_buffer *Ki, + struct krb5_buffer *setkey, + gfp_t gfp); + + /* Derive the key needed for a checksum hash object. */ + int (*derive_checksum_key)(const struct krb5_enctype *krb5, + const struct krb5_buffer *TK, + unsigned int usage, + struct krb5_buffer *setkey, + gfp_t gfp); + + /* Directly load the keys needed for a checksum hash object. */ + int (*load_checksum_key)(const struct krb5_enctype *krb5, + const struct krb5_buffer *Kc, + struct krb5_buffer *setkey, + gfp_t gfp); + + /* Encrypt data in-place, inserting confounder and checksum. */ + ssize_t (*encrypt)(const struct krb5_enctype *krb5, + struct crypto_aead *aead, + struct scatterlist *sg, unsigned int nr_sg, + size_t sg_len, + size_t data_offset, size_t data_len, + bool preconfounded); + + /* Decrypt data in-place, removing confounder and checksum */ + int (*decrypt)(const struct krb5_enctype *krb5, + struct crypto_aead *aead, + struct scatterlist *sg, unsigned int nr_sg, + size_t *_offset, size_t *_len); + + /* Generate a MIC on part of a packet, inserting the checksum */ + ssize_t (*get_mic)(const struct krb5_enctype *krb5, + struct crypto_shash *shash, + const struct krb5_buffer *metadata, + struct scatterlist *sg, unsigned int nr_sg, + size_t sg_len, + size_t data_offset, size_t data_len); + + /* Verify the MIC on a piece of data, removing the checksum */ + int (*verify_mic)(const struct krb5_enctype *krb5, + struct crypto_shash *shash, + const struct krb5_buffer *metadata, + struct scatterlist *sg, unsigned int nr_sg, + size_t *_offset, size_t *_len); +}; + +/* + * Crypto size/alignment rounding convenience macros. + */ +#define crypto_roundup(X) ((unsigned int)round_up((X), CRYPTO_MINALIGN)) + +#define krb5_aead_size(TFM) \ + crypto_roundup(sizeof(struct aead_request) + crypto_aead_reqsize(TFM)) +#define krb5_aead_ivsize(TFM) \ + crypto_roundup(crypto_aead_ivsize(TFM)) +#define krb5_shash_size(TFM) \ + crypto_roundup(sizeof(struct shash_desc) + crypto_shash_descsize(TFM)) +#define krb5_digest_size(TFM) \ + crypto_roundup(crypto_shash_digestsize(TFM)) +#define round16(x) (((x) + 15) & ~15) + +/* + * Self-testing data. + */ +struct krb5_prf_test { + u32 etype; + const char *name, *key, *octet, *prf; +}; + +struct krb5_key_test_one { + u32 use; + const char *key; +}; + +struct krb5_key_test { + u32 etype; + const char *name, *key; + struct krb5_key_test_one Kc, Ke, Ki; +}; + +struct krb5_enc_test { + u32 etype; + u32 usage; + const char *name, *plain, *conf, *K0, *Ke, *Ki, *ct; +}; + +struct krb5_mic_test { + u32 etype; + u32 usage; + const char *name, *plain, *K0, *Kc, *mic; +}; + +/* + * krb5_api.c + */ +struct crypto_aead *krb5_prepare_encryption(const struct krb5_enctype *krb5, + const struct krb5_buffer *keys, + gfp_t gfp); +struct crypto_shash *krb5_prepare_checksum(const struct krb5_enctype *krb5, + const struct krb5_buffer *Kc, + gfp_t gfp); + +/* + * krb5_kdf.c + */ +int krb5_derive_Kc(const struct krb5_enctype *krb5, const struct krb5_buffer *TK, + u32 usage, struct krb5_buffer *key, gfp_t gfp); +int krb5_derive_Ke(const struct krb5_enctype *krb5, const struct krb5_buffer *TK, + u32 usage, struct krb5_buffer *key, gfp_t gfp); +int krb5_derive_Ki(const struct krb5_enctype *krb5, const struct krb5_buffer *TK, + u32 usage, struct krb5_buffer *key, gfp_t gfp); + +/* + * rfc3961_simplified.c + */ +extern const struct krb5_crypto_profile rfc3961_simplified_profile; + +int crypto_shash_update_sg(struct shash_desc *desc, struct scatterlist *sg, + size_t offset, size_t len); +int authenc_derive_encrypt_keys(const struct krb5_enctype *krb5, + const struct krb5_buffer *TK, + unsigned int usage, + struct krb5_buffer *setkey, + gfp_t gfp); +int authenc_load_encrypt_keys(const struct krb5_enctype *krb5, + const struct krb5_buffer *Ke, + const struct krb5_buffer *Ki, + struct krb5_buffer *setkey, + gfp_t gfp); +int rfc3961_derive_checksum_key(const struct krb5_enctype *krb5, + const struct krb5_buffer *TK, + unsigned int usage, + struct krb5_buffer *setkey, + gfp_t gfp); +int rfc3961_load_checksum_key(const struct krb5_enctype *krb5, + const struct krb5_buffer *Kc, + struct krb5_buffer *setkey, + gfp_t gfp); +ssize_t krb5_aead_encrypt(const struct krb5_enctype *krb5, + struct crypto_aead *aead, + struct scatterlist *sg, unsigned int nr_sg, size_t sg_len, + size_t data_offset, size_t data_len, + bool preconfounded); +int krb5_aead_decrypt(const struct krb5_enctype *krb5, + struct crypto_aead *aead, + struct scatterlist *sg, unsigned int nr_sg, + size_t *_offset, size_t *_len); +ssize_t rfc3961_get_mic(const struct krb5_enctype *krb5, + struct crypto_shash *shash, + const struct krb5_buffer *metadata, + struct scatterlist *sg, unsigned int nr_sg, size_t sg_len, + size_t data_offset, size_t data_len); +int rfc3961_verify_mic(const struct krb5_enctype *krb5, + struct crypto_shash *shash, + const struct krb5_buffer *metadata, + struct scatterlist *sg, unsigned int nr_sg, + size_t *_offset, size_t *_len); + +/* + * rfc3962_aes.c + */ +extern const struct krb5_enctype krb5_aes128_cts_hmac_sha1_96; +extern const struct krb5_enctype krb5_aes256_cts_hmac_sha1_96; + +/* + * rfc6803_camellia.c + */ +extern const struct krb5_enctype krb5_camellia128_cts_cmac; +extern const struct krb5_enctype krb5_camellia256_cts_cmac; + +/* + * rfc8009_aes2.c + */ +extern const struct krb5_enctype krb5_aes128_cts_hmac_sha256_128; +extern const struct krb5_enctype krb5_aes256_cts_hmac_sha384_192; + +/* + * selftest.c + */ +#ifdef CONFIG_CRYPTO_KRB5_SELFTESTS +int krb5_selftest(void); +#else +static inline int krb5_selftest(void) { return 0; } +#endif + +/* + * selftest_data.c + */ +extern const struct krb5_prf_test krb5_prf_tests[]; +extern const struct krb5_key_test krb5_key_tests[]; +extern const struct krb5_enc_test krb5_enc_tests[]; +extern const struct krb5_mic_test krb5_mic_tests[]; diff --git a/crypto/krb5/krb5_api.c b/crypto/krb5/krb5_api.c new file mode 100644 index 0000000000000..dca43744a107f --- /dev/null +++ b/crypto/krb5/krb5_api.c @@ -0,0 +1,452 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Kerberos 5 crypto library. + * + * Copyright (C) 2025 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include "internal.h" + +MODULE_DESCRIPTION("Kerberos 5 crypto"); +MODULE_AUTHOR("Red Hat, Inc."); +MODULE_LICENSE("GPL"); + +static const struct krb5_enctype *const krb5_supported_enctypes[] = { + &krb5_aes128_cts_hmac_sha1_96, + &krb5_aes256_cts_hmac_sha1_96, + &krb5_aes128_cts_hmac_sha256_128, + &krb5_aes256_cts_hmac_sha384_192, + &krb5_camellia128_cts_cmac, + &krb5_camellia256_cts_cmac, +}; + +/** + * crypto_krb5_find_enctype - Find the handler for a Kerberos5 encryption type + * @enctype: The standard Kerberos encryption type number + * + * Look up a Kerberos encryption type by number. If successful, returns a + * pointer to the type tables; returns NULL otherwise. + */ +const struct krb5_enctype *crypto_krb5_find_enctype(u32 enctype) +{ + const struct krb5_enctype *krb5; + size_t i; + + for (i = 0; i < ARRAY_SIZE(krb5_supported_enctypes); i++) { + krb5 = krb5_supported_enctypes[i]; + if (krb5->etype == enctype) + return krb5; + } + + return NULL; +} +EXPORT_SYMBOL(crypto_krb5_find_enctype); + +/** + * crypto_krb5_how_much_buffer - Work out how much buffer is required for an amount of data + * @krb5: The encoding to use. + * @mode: The mode in which to operated (checksum/encrypt) + * @data_size: How much data we want to allow for + * @_offset: Where to place the offset into the buffer + * + * Calculate how much buffer space is required to wrap a given amount of data. + * This allows for a confounder, padding and checksum as appropriate. The + * amount of buffer required is returned and the offset into the buffer at + * which the data will start is placed in *_offset. + */ +size_t crypto_krb5_how_much_buffer(const struct krb5_enctype *krb5, + enum krb5_crypto_mode mode, + size_t data_size, size_t *_offset) +{ + switch (mode) { + case KRB5_CHECKSUM_MODE: + *_offset = krb5->cksum_len; + return krb5->cksum_len + data_size; + + case KRB5_ENCRYPT_MODE: + *_offset = krb5->conf_len; + return krb5->conf_len + data_size + krb5->cksum_len; + + default: + WARN_ON(1); + *_offset = 0; + return 0; + } +} +EXPORT_SYMBOL(crypto_krb5_how_much_buffer); + +/** + * crypto_krb5_how_much_data - Work out how much data can fit in an amount of buffer + * @krb5: The encoding to use. + * @mode: The mode in which to operated (checksum/encrypt) + * @_buffer_size: How much buffer we want to allow for (may be reduced) + * @_offset: Where to place the offset into the buffer + * + * Calculate how much data can be fitted into given amount of buffer. This + * allows for a confounder, padding and checksum as appropriate. The amount of + * data that will fit is returned, the amount of buffer required is shrunk to + * allow for alignment and the offset into the buffer at which the data will + * start is placed in *_offset. + */ +size_t crypto_krb5_how_much_data(const struct krb5_enctype *krb5, + enum krb5_crypto_mode mode, + size_t *_buffer_size, size_t *_offset) +{ + size_t buffer_size = *_buffer_size, data_size; + + switch (mode) { + case KRB5_CHECKSUM_MODE: + if (WARN_ON(buffer_size < krb5->cksum_len + 1)) + goto bad; + *_offset = krb5->cksum_len; + return buffer_size - krb5->cksum_len; + + case KRB5_ENCRYPT_MODE: + if (WARN_ON(buffer_size < krb5->conf_len + 1 + krb5->cksum_len)) + goto bad; + data_size = buffer_size - krb5->cksum_len; + *_offset = krb5->conf_len; + return data_size - krb5->conf_len; + + default: + WARN_ON(1); + goto bad; + } + +bad: + *_offset = 0; + return 0; +} +EXPORT_SYMBOL(crypto_krb5_how_much_data); + +/** + * crypto_krb5_where_is_the_data - Find the data in a decrypted message + * @krb5: The encoding to use. + * @mode: Mode of operation + * @_offset: Offset of the secure blob in the buffer; updated to data offset. + * @_len: The length of the secure blob; updated to data length. + * + * Find the offset and size of the data in a secure message so that this + * information can be used in the metadata buffer which will get added to the + * digest by crypto_krb5_verify_mic(). + */ +void crypto_krb5_where_is_the_data(const struct krb5_enctype *krb5, + enum krb5_crypto_mode mode, + size_t *_offset, size_t *_len) +{ + switch (mode) { + case KRB5_CHECKSUM_MODE: + *_offset += krb5->cksum_len; + *_len -= krb5->cksum_len; + return; + case KRB5_ENCRYPT_MODE: + *_offset += krb5->conf_len; + *_len -= krb5->conf_len + krb5->cksum_len; + return; + default: + WARN_ON_ONCE(1); + return; + } +} +EXPORT_SYMBOL(crypto_krb5_where_is_the_data); + +/* + * Prepare the encryption with derived key data. + */ +struct crypto_aead *krb5_prepare_encryption(const struct krb5_enctype *krb5, + const struct krb5_buffer *keys, + gfp_t gfp) +{ + struct crypto_aead *ci = NULL; + int ret = -ENOMEM; + + ci = crypto_alloc_aead(krb5->encrypt_name, 0, CRYPTO_ALG_ASYNC); + if (IS_ERR(ci)) { + ret = PTR_ERR(ci); + if (ret == -ENOENT) + ret = -ENOPKG; + goto err; + } + + ret = crypto_aead_setkey(ci, keys->data, keys->len); + if (ret < 0) { + pr_err("Couldn't set AEAD key %s: %d\n", krb5->encrypt_name, ret); + goto err_ci; + } + + ret = crypto_aead_setauthsize(ci, krb5->cksum_len); + if (ret < 0) { + pr_err("Couldn't set AEAD authsize %s: %d\n", krb5->encrypt_name, ret); + goto err_ci; + } + + return ci; +err_ci: + crypto_free_aead(ci); +err: + return ERR_PTR(ret); +} + +/** + * crypto_krb5_prepare_encryption - Prepare AEAD crypto object for encryption-mode + * @krb5: The encoding to use. + * @TK: The transport key to use. + * @usage: The usage constant for key derivation. + * @gfp: Allocation flags. + * + * Allocate a crypto object that does all the necessary crypto, key it and set + * its parameters and return the crypto handle to it. This can then be used to + * dispatch encrypt and decrypt operations. + */ +struct crypto_aead *crypto_krb5_prepare_encryption(const struct krb5_enctype *krb5, + const struct krb5_buffer *TK, + u32 usage, gfp_t gfp) +{ + struct crypto_aead *ci = NULL; + struct krb5_buffer keys = {}; + int ret; + + ret = krb5->profile->derive_encrypt_keys(krb5, TK, usage, &keys, gfp); + if (ret < 0) + goto err; + + ci = krb5_prepare_encryption(krb5, &keys, gfp); + if (IS_ERR(ci)) { + ret = PTR_ERR(ci); + goto err; + } + + kfree_sensitive(keys.data); + return ci; +err: + kfree_sensitive(keys.data); + return ERR_PTR(ret); +} +EXPORT_SYMBOL(crypto_krb5_prepare_encryption); + +/* + * Prepare the checksum with derived key data. + */ +struct crypto_shash *krb5_prepare_checksum(const struct krb5_enctype *krb5, + const struct krb5_buffer *Kc, + gfp_t gfp) +{ + struct crypto_shash *ci = NULL; + int ret = -ENOMEM; + + ci = crypto_alloc_shash(krb5->cksum_name, 0, 0); + if (IS_ERR(ci)) { + ret = PTR_ERR(ci); + if (ret == -ENOENT) + ret = -ENOPKG; + goto err; + } + + ret = crypto_shash_setkey(ci, Kc->data, Kc->len); + if (ret < 0) { + pr_err("Couldn't set shash key %s: %d\n", krb5->cksum_name, ret); + goto err_ci; + } + + return ci; +err_ci: + crypto_free_shash(ci); +err: + return ERR_PTR(ret); +} + +/** + * crypto_krb5_prepare_checksum - Prepare AEAD crypto object for checksum-mode + * @krb5: The encoding to use. + * @TK: The transport key to use. + * @usage: The usage constant for key derivation. + * @gfp: Allocation flags. + * + * Allocate a crypto object that does all the necessary crypto, key it and set + * its parameters and return the crypto handle to it. This can then be used to + * dispatch get_mic and verify_mic operations. + */ +struct crypto_shash *crypto_krb5_prepare_checksum(const struct krb5_enctype *krb5, + const struct krb5_buffer *TK, + u32 usage, gfp_t gfp) +{ + struct crypto_shash *ci = NULL; + struct krb5_buffer keys = {}; + int ret; + + ret = krb5->profile->derive_checksum_key(krb5, TK, usage, &keys, gfp); + if (ret < 0) { + pr_err("get_Kc failed %d\n", ret); + goto err; + } + + ci = krb5_prepare_checksum(krb5, &keys, gfp); + if (IS_ERR(ci)) { + ret = PTR_ERR(ci); + goto err; + } + + kfree_sensitive(keys.data); + return ci; +err: + kfree_sensitive(keys.data); + return ERR_PTR(ret); +} +EXPORT_SYMBOL(crypto_krb5_prepare_checksum); + +/** + * crypto_krb5_encrypt - Apply Kerberos encryption and integrity. + * @krb5: The encoding to use. + * @aead: The keyed crypto object to use. + * @sg: Scatterlist defining the crypto buffer. + * @nr_sg: The number of elements in @sg. + * @sg_len: The size of the buffer. + * @data_offset: The offset of the data in the @sg buffer. + * @data_len: The length of the data. + * @preconfounded: True if the confounder is already inserted. + * + * Using the specified Kerberos encoding, insert a confounder and padding as + * needed, encrypt this and the data in place and insert an integrity checksum + * into the buffer. + * + * The buffer must include space for the confounder, the checksum and any + * padding required. The caller can preinsert the confounder into the buffer + * (for testing, for example). + * + * The resulting secured blob may be less than the size of the buffer. + * + * Returns the size of the secure blob if successful, -ENOMEM on an allocation + * failure, -EFAULT if there is insufficient space, -EMSGSIZE if the confounder + * is too short or the data is misaligned. Other errors may also be returned + * from the crypto layer. + */ +ssize_t crypto_krb5_encrypt(const struct krb5_enctype *krb5, + struct crypto_aead *aead, + struct scatterlist *sg, unsigned int nr_sg, + size_t sg_len, + size_t data_offset, size_t data_len, + bool preconfounded) +{ + if (WARN_ON(data_offset > sg_len || + data_len > sg_len || + data_offset > sg_len - data_len)) + return -EMSGSIZE; + return krb5->profile->encrypt(krb5, aead, sg, nr_sg, sg_len, + data_offset, data_len, preconfounded); +} +EXPORT_SYMBOL(crypto_krb5_encrypt); + +/** + * crypto_krb5_decrypt - Validate and remove Kerberos encryption and integrity. + * @krb5: The encoding to use. + * @aead: The keyed crypto object to use. + * @sg: Scatterlist defining the crypto buffer. + * @nr_sg: The number of elements in @sg. + * @_offset: Offset of the secure blob in the buffer; updated to data offset. + * @_len: The length of the secure blob; updated to data length. + * + * Using the specified Kerberos encoding, check and remove the integrity + * checksum and decrypt the secure region, stripping off the confounder. + * + * If successful, @_offset and @_len are updated to outline the region in which + * the data plus the trailing padding are stored. The caller is responsible + * for working out how much padding there is and removing it. + * + * Returns the 0 if successful, -ENOMEM on an allocation failure; sets + * *_error_code and returns -EPROTO if the data cannot be parsed, or -EBADMSG + * if the integrity checksum doesn't match). Other errors may also be returned + * from the crypto layer. + */ +int crypto_krb5_decrypt(const struct krb5_enctype *krb5, + struct crypto_aead *aead, + struct scatterlist *sg, unsigned int nr_sg, + size_t *_offset, size_t *_len) +{ + return krb5->profile->decrypt(krb5, aead, sg, nr_sg, _offset, _len); +} +EXPORT_SYMBOL(crypto_krb5_decrypt); + +/** + * crypto_krb5_get_mic - Apply Kerberos integrity checksum. + * @krb5: The encoding to use. + * @shash: The keyed hash to use. + * @metadata: Metadata to add into the hash before adding the data. + * @sg: Scatterlist defining the crypto buffer. + * @nr_sg: The number of elements in @sg. + * @sg_len: The size of the buffer. + * @data_offset: The offset of the data in the @sg buffer. + * @data_len: The length of the data. + * + * Using the specified Kerberos encoding, calculate and insert an integrity + * checksum into the buffer. + * + * The buffer must include space for the checksum at the front. + * + * Returns the size of the secure blob if successful, -ENOMEM on an allocation + * failure, -EFAULT if there is insufficient space, -EMSGSIZE if the gap for + * the checksum is too short. Other errors may also be returned from the + * crypto layer. + */ +ssize_t crypto_krb5_get_mic(const struct krb5_enctype *krb5, + struct crypto_shash *shash, + const struct krb5_buffer *metadata, + struct scatterlist *sg, unsigned int nr_sg, + size_t sg_len, + size_t data_offset, size_t data_len) +{ + if (WARN_ON(data_offset > sg_len || + data_len > sg_len || + data_offset > sg_len - data_len)) + return -EMSGSIZE; + return krb5->profile->get_mic(krb5, shash, metadata, sg, nr_sg, sg_len, + data_offset, data_len); +} +EXPORT_SYMBOL(crypto_krb5_get_mic); + +/** + * crypto_krb5_verify_mic - Validate and remove Kerberos integrity checksum. + * @krb5: The encoding to use. + * @shash: The keyed hash to use. + * @metadata: Metadata to add into the hash before adding the data. + * @sg: Scatterlist defining the crypto buffer. + * @nr_sg: The number of elements in @sg. + * @_offset: Offset of the secure blob in the buffer; updated to data offset. + * @_len: The length of the secure blob; updated to data length. + * + * Using the specified Kerberos encoding, check and remove the integrity + * checksum. + * + * If successful, @_offset and @_len are updated to outline the region in which + * the data is stored. + * + * Returns the 0 if successful, -ENOMEM on an allocation failure; sets + * *_error_code and returns -EPROTO if the data cannot be parsed, or -EBADMSG + * if the checksum doesn't match). Other errors may also be returned from the + * crypto layer. + */ +int crypto_krb5_verify_mic(const struct krb5_enctype *krb5, + struct crypto_shash *shash, + const struct krb5_buffer *metadata, + struct scatterlist *sg, unsigned int nr_sg, + size_t *_offset, size_t *_len) +{ + return krb5->profile->verify_mic(krb5, shash, metadata, sg, nr_sg, + _offset, _len); +} +EXPORT_SYMBOL(crypto_krb5_verify_mic); + +static int __init crypto_krb5_init(void) +{ + return krb5_selftest(); +} +module_init(crypto_krb5_init); + +static void __exit crypto_krb5_exit(void) +{ +} +module_exit(crypto_krb5_exit); diff --git a/crypto/krb5/krb5_kdf.c b/crypto/krb5/krb5_kdf.c new file mode 100644 index 0000000000000..6699e5469d1be --- /dev/null +++ b/crypto/krb5/krb5_kdf.c @@ -0,0 +1,145 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Kerberos key derivation. + * + * Copyright (C) 2025 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include "internal.h" + +/** + * crypto_krb5_calc_PRFplus - Calculate PRF+ [RFC4402] + * @krb5: The encryption type to use + * @K: The protocol key for the pseudo-random function + * @L: The length of the output + * @S: The input octet string + * @result: Result buffer, sized to krb5->prf_len + * @gfp: Allocation restrictions + * + * Calculate the kerberos pseudo-random function, PRF+() by the following + * method: + * + * PRF+(K, L, S) = truncate(L, T1 || T2 || .. || Tn) + * Tn = PRF(K, n || S) + * [rfc4402 sec 2] + */ +int crypto_krb5_calc_PRFplus(const struct krb5_enctype *krb5, + const struct krb5_buffer *K, + unsigned int L, + const struct krb5_buffer *S, + struct krb5_buffer *result, + gfp_t gfp) +{ + struct krb5_buffer T_series, Tn, n_S; + void *buffer; + int ret, n = 1; + + Tn.len = krb5->prf_len; + T_series.len = 0; + n_S.len = 4 + S->len; + + buffer = kzalloc(round16(L + Tn.len) + round16(n_S.len), gfp); + if (!buffer) + return -ENOMEM; + + T_series.data = buffer; + n_S.data = buffer + round16(L + Tn.len); + memcpy(n_S.data + 4, S->data, S->len); + + while (T_series.len < L) { + *(__be32 *)(n_S.data) = htonl(n); + Tn.data = T_series.data + Tn.len * (n - 1); + ret = krb5->profile->calc_PRF(krb5, K, &n_S, &Tn, gfp); + if (ret < 0) + goto err; + T_series.len += Tn.len; + n++; + } + + /* Truncate to L */ + memcpy(result->data, T_series.data, L); + ret = 0; + +err: + kfree_sensitive(buffer); + return ret; +} +EXPORT_SYMBOL(crypto_krb5_calc_PRFplus); + +/** + * krb5_derive_Kc - Derive key Kc and install into a hash + * @krb5: The encryption type to use + * @TK: The base key + * @usage: The key usage number + * @key: Prepped buffer to store the key into + * @gfp: Allocation restrictions + * + * Derive the Kerberos Kc checksumming key. The key is stored into the + * prepared buffer. + */ +int krb5_derive_Kc(const struct krb5_enctype *krb5, const struct krb5_buffer *TK, + u32 usage, struct krb5_buffer *key, gfp_t gfp) +{ + u8 buf[5] __aligned(CRYPTO_MINALIGN); + struct krb5_buffer usage_constant = { .len = 5, .data = buf }; + + *(__be32 *)buf = cpu_to_be32(usage); + buf[4] = KEY_USAGE_SEED_CHECKSUM; + + key->len = krb5->Kc_len; + return krb5->profile->calc_Kc(krb5, TK, &usage_constant, key, gfp); +} + +/** + * krb5_derive_Ke - Derive key Ke and install into an skcipher + * @krb5: The encryption type to use + * @TK: The base key + * @usage: The key usage number + * @key: Prepped buffer to store the key into + * @gfp: Allocation restrictions + * + * Derive the Kerberos Ke encryption key. The key is stored into the prepared + * buffer. + */ +int krb5_derive_Ke(const struct krb5_enctype *krb5, const struct krb5_buffer *TK, + u32 usage, struct krb5_buffer *key, gfp_t gfp) +{ + u8 buf[5] __aligned(CRYPTO_MINALIGN); + struct krb5_buffer usage_constant = { .len = 5, .data = buf }; + + *(__be32 *)buf = cpu_to_be32(usage); + buf[4] = KEY_USAGE_SEED_ENCRYPTION; + + key->len = krb5->Ke_len; + return krb5->profile->calc_Ke(krb5, TK, &usage_constant, key, gfp); +} + +/** + * krb5_derive_Ki - Derive key Ki and install into a hash + * @krb5: The encryption type to use + * @TK: The base key + * @usage: The key usage number + * @key: Prepped buffer to store the key into + * @gfp: Allocation restrictions + * + * Derive the Kerberos Ki integrity checksum key. The key is stored into the + * prepared buffer. + */ +int krb5_derive_Ki(const struct krb5_enctype *krb5, const struct krb5_buffer *TK, + u32 usage, struct krb5_buffer *key, gfp_t gfp) +{ + u8 buf[5] __aligned(CRYPTO_MINALIGN); + struct krb5_buffer usage_constant = { .len = 5, .data = buf }; + + *(__be32 *)buf = cpu_to_be32(usage); + buf[4] = KEY_USAGE_SEED_INTEGRITY; + + key->len = krb5->Ki_len; + return krb5->profile->calc_Ki(krb5, TK, &usage_constant, key, gfp); +} diff --git a/crypto/krb5/rfc3961_simplified.c b/crypto/krb5/rfc3961_simplified.c new file mode 100644 index 0000000000000..e49cbdec7c404 --- /dev/null +++ b/crypto/krb5/rfc3961_simplified.c @@ -0,0 +1,793 @@ +// SPDX-License-Identifier: BSD-3-Clause +/* rfc3961 Kerberos 5 simplified crypto profile. + * + * Parts borrowed from net/sunrpc/auth_gss/. + */ +/* + * COPYRIGHT (c) 2008 + * The Regents of the University of Michigan + * ALL RIGHTS RESERVED + * + * Permission is granted to use, copy, create derivative works + * and redistribute this software and such derivative works + * for any purpose, so long as the name of The University of + * Michigan is not used in any advertising or publicity + * pertaining to the use of distribution of this software + * without specific, written prior authorization. If the + * above copyright notice or any other identification of the + * University of Michigan is included in any copy of any + * portion of this software, then the disclaimer below must + * also be included. + * + * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION + * FROM THE UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY + * PURPOSE, AND WITHOUT WARRANTY BY THE UNIVERSITY OF + * MICHIGAN OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING + * WITHOUT LIMITATION THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE + * REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE LIABLE + * FOR ANY DAMAGES, INCLUDING SPECIAL, INDIRECT, INCIDENTAL, OR + * CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM ARISING + * OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN + * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGES. + */ + +/* + * Copyright (C) 1998 by the FundsXpress, INC. + * + * All rights reserved. + * + * Export of this software from the United States of America may require + * a specific license from the United States Government. It is the + * responsibility of any person or organization contemplating export to + * obtain such a license before exporting. + * + * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and + * distribute this software and its documentation for any purpose and + * without fee is hereby granted, provided that the above copyright + * notice appear in all copies and that both that copyright notice and + * this permission notice appear in supporting documentation, and that + * the name of FundsXpress. not be used in advertising or publicity pertaining + * to distribution of the software without specific, written prior + * permission. FundsXpress makes no representations about the suitability of + * this software for any purpose. It is provided "as is" without express + * or implied warranty. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + +/* + * Copyright (C) 2025 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "internal.h" + +/* Maximum blocksize for the supported crypto algorithms */ +#define KRB5_MAX_BLOCKSIZE (16) + +int crypto_shash_update_sg(struct shash_desc *desc, struct scatterlist *sg, + size_t offset, size_t len) +{ + struct sg_mapping_iter miter; + size_t i, n; + int ret = 0; + + sg_miter_start(&miter, sg, sg_nents(sg), + SG_MITER_FROM_SG | SG_MITER_LOCAL); + sg_miter_skip(&miter, offset); + for (i = 0; i < len; i += n) { + sg_miter_next(&miter); + n = min(miter.length, len - i); + ret = crypto_shash_update(desc, miter.addr, n); + if (ret < 0) + break; + } + sg_miter_stop(&miter); + return ret; +} + +static int rfc3961_do_encrypt(struct crypto_sync_skcipher *tfm, void *iv, + const struct krb5_buffer *in, struct krb5_buffer *out) +{ + struct scatterlist sg[1]; + u8 local_iv[KRB5_MAX_BLOCKSIZE] __aligned(KRB5_MAX_BLOCKSIZE) = {0}; + SYNC_SKCIPHER_REQUEST_ON_STACK(req, tfm); + int ret; + + if (WARN_ON(in->len != out->len)) + return -EINVAL; + if (out->len % crypto_sync_skcipher_blocksize(tfm) != 0) + return -EINVAL; + + if (crypto_sync_skcipher_ivsize(tfm) > KRB5_MAX_BLOCKSIZE) + return -EINVAL; + + if (iv) + memcpy(local_iv, iv, crypto_sync_skcipher_ivsize(tfm)); + + memcpy(out->data, in->data, out->len); + sg_init_one(sg, out->data, out->len); + + skcipher_request_set_sync_tfm(req, tfm); + skcipher_request_set_callback(req, 0, NULL, NULL); + skcipher_request_set_crypt(req, sg, sg, out->len, local_iv); + + ret = crypto_skcipher_encrypt(req); + skcipher_request_zero(req); + return ret; +} + +/* + * Calculate an unkeyed basic hash. + */ +static int rfc3961_calc_H(const struct krb5_enctype *krb5, + const struct krb5_buffer *data, + struct krb5_buffer *digest, + gfp_t gfp) +{ + struct crypto_shash *tfm; + struct shash_desc *desc; + size_t desc_size; + int ret = -ENOMEM; + + tfm = crypto_alloc_shash(krb5->hash_name, 0, 0); + if (IS_ERR(tfm)) + return (PTR_ERR(tfm) == -ENOENT) ? -ENOPKG : PTR_ERR(tfm); + + desc_size = crypto_shash_descsize(tfm) + sizeof(*desc); + + desc = kzalloc(desc_size, gfp); + if (!desc) + goto error_tfm; + + digest->len = crypto_shash_digestsize(tfm); + digest->data = kzalloc(digest->len, gfp); + if (!digest->data) + goto error_desc; + + desc->tfm = tfm; + ret = crypto_shash_init(desc); + if (ret < 0) + goto error_digest; + + ret = crypto_shash_finup(desc, data->data, data->len, digest->data); + if (ret < 0) + goto error_digest; + + goto error_desc; + +error_digest: + kfree_sensitive(digest->data); +error_desc: + kfree_sensitive(desc); +error_tfm: + crypto_free_shash(tfm); + return ret; +} + +/* + * This is the n-fold function as described in rfc3961, sec 5.1 + * Taken from MIT Kerberos and modified. + */ +static void rfc3961_nfold(const struct krb5_buffer *source, struct krb5_buffer *result) +{ + const u8 *in = source->data; + u8 *out = result->data; + unsigned long ulcm; + unsigned int inbits, outbits; + int byte, i, msbit; + + /* the code below is more readable if I make these bytes instead of bits */ + inbits = source->len; + outbits = result->len; + + /* first compute lcm(n,k) */ + ulcm = lcm(inbits, outbits); + + /* now do the real work */ + memset(out, 0, outbits); + byte = 0; + + /* this will end up cycling through k lcm(k,n)/k times, which + * is correct. + */ + for (i = ulcm-1; i >= 0; i--) { + /* compute the msbit in k which gets added into this byte */ + msbit = ( + /* first, start with the msbit in the first, + * unrotated byte + */ + ((inbits << 3) - 1) + + /* then, for each byte, shift to the right + * for each repetition + */ + (((inbits << 3) + 13) * (i/inbits)) + + /* last, pick out the correct byte within + * that shifted repetition + */ + ((inbits - (i % inbits)) << 3) + ) % (inbits << 3); + + /* pull out the byte value itself */ + byte += (((in[((inbits - 1) - (msbit >> 3)) % inbits] << 8) | + (in[((inbits) - (msbit >> 3)) % inbits])) + >> ((msbit & 7) + 1)) & 0xff; + + /* do the addition */ + byte += out[i % outbits]; + out[i % outbits] = byte & 0xff; + + /* keep around the carry bit, if any */ + byte >>= 8; + } + + /* if there's a carry bit left over, add it back in */ + if (byte) { + for (i = outbits - 1; i >= 0; i--) { + /* do the addition */ + byte += out[i]; + out[i] = byte & 0xff; + + /* keep around the carry bit, if any */ + byte >>= 8; + } + } +} + +/* + * Calculate a derived key, DK(Base Key, Well-Known Constant) + * + * DK(Key, Constant) = random-to-key(DR(Key, Constant)) + * DR(Key, Constant) = k-truncate(E(Key, Constant, initial-cipher-state)) + * K1 = E(Key, n-fold(Constant), initial-cipher-state) + * K2 = E(Key, K1, initial-cipher-state) + * K3 = E(Key, K2, initial-cipher-state) + * K4 = ... + * DR(Key, Constant) = k-truncate(K1 | K2 | K3 | K4 ...) + * [rfc3961 sec 5.1] + */ +static int rfc3961_calc_DK(const struct krb5_enctype *krb5, + const struct krb5_buffer *inkey, + const struct krb5_buffer *in_constant, + struct krb5_buffer *result, + gfp_t gfp) +{ + unsigned int blocksize, keybytes, keylength, n; + struct krb5_buffer inblock, outblock, rawkey; + struct crypto_sync_skcipher *cipher; + int ret = -EINVAL; + + blocksize = krb5->block_len; + keybytes = krb5->key_bytes; + keylength = krb5->key_len; + + if (inkey->len != keylength || result->len != keylength) + return -EINVAL; + if (!krb5->random_to_key && result->len != keybytes) + return -EINVAL; + + cipher = crypto_alloc_sync_skcipher(krb5->derivation_enc, 0, 0); + if (IS_ERR(cipher)) { + ret = (PTR_ERR(cipher) == -ENOENT) ? -ENOPKG : PTR_ERR(cipher); + goto err_return; + } + ret = crypto_sync_skcipher_setkey(cipher, inkey->data, inkey->len); + if (ret < 0) + goto err_free_cipher; + + ret = -ENOMEM; + inblock.data = kzalloc(blocksize * 2 + keybytes, gfp); + if (!inblock.data) + goto err_free_cipher; + + inblock.len = blocksize; + outblock.data = inblock.data + blocksize; + outblock.len = blocksize; + rawkey.data = outblock.data + blocksize; + rawkey.len = keybytes; + + /* initialize the input block */ + + if (in_constant->len == inblock.len) + memcpy(inblock.data, in_constant->data, inblock.len); + else + rfc3961_nfold(in_constant, &inblock); + + /* loop encrypting the blocks until enough key bytes are generated */ + n = 0; + while (n < rawkey.len) { + rfc3961_do_encrypt(cipher, NULL, &inblock, &outblock); + + if (keybytes - n <= outblock.len) { + memcpy(rawkey.data + n, outblock.data, keybytes - n); + break; + } + + memcpy(rawkey.data + n, outblock.data, outblock.len); + memcpy(inblock.data, outblock.data, outblock.len); + n += outblock.len; + } + + /* postprocess the key */ + if (!krb5->random_to_key) { + /* Identity random-to-key function. */ + memcpy(result->data, rawkey.data, rawkey.len); + ret = 0; + } else { + ret = krb5->random_to_key(krb5, &rawkey, result); + } + + kfree_sensitive(inblock.data); +err_free_cipher: + crypto_free_sync_skcipher(cipher); +err_return: + return ret; +} + +/* + * Calculate single encryption, E() + * + * E(Key, octets) + */ +static int rfc3961_calc_E(const struct krb5_enctype *krb5, + const struct krb5_buffer *key, + const struct krb5_buffer *in_data, + struct krb5_buffer *result, + gfp_t gfp) +{ + struct crypto_sync_skcipher *cipher; + int ret; + + cipher = crypto_alloc_sync_skcipher(krb5->derivation_enc, 0, 0); + if (IS_ERR(cipher)) { + ret = (PTR_ERR(cipher) == -ENOENT) ? -ENOPKG : PTR_ERR(cipher); + goto err; + } + + ret = crypto_sync_skcipher_setkey(cipher, key->data, key->len); + if (ret < 0) + goto err_free; + + ret = rfc3961_do_encrypt(cipher, NULL, in_data, result); + +err_free: + crypto_free_sync_skcipher(cipher); +err: + return ret; +} + +/* + * Calculate the pseudo-random function, PRF(). + * + * tmp1 = H(octet-string) + * tmp2 = truncate tmp1 to multiple of m + * PRF = E(DK(protocol-key, prfconstant), tmp2, initial-cipher-state) + * + * The "prfconstant" used in the PRF operation is the three-octet string + * "prf". + * [rfc3961 sec 5.3] + */ +static int rfc3961_calc_PRF(const struct krb5_enctype *krb5, + const struct krb5_buffer *protocol_key, + const struct krb5_buffer *octet_string, + struct krb5_buffer *result, + gfp_t gfp) +{ + static const struct krb5_buffer prfconstant = { 3, "prf" }; + struct krb5_buffer derived_key; + struct krb5_buffer tmp1, tmp2; + unsigned int m = krb5->block_len; + void *buffer; + int ret; + + if (result->len != krb5->prf_len) + return -EINVAL; + + tmp1.len = krb5->hash_len; + derived_key.len = krb5->key_bytes; + buffer = kzalloc(round16(tmp1.len) + round16(derived_key.len), gfp); + if (!buffer) + return -ENOMEM; + + tmp1.data = buffer; + derived_key.data = buffer + round16(tmp1.len); + + ret = rfc3961_calc_H(krb5, octet_string, &tmp1, gfp); + if (ret < 0) + goto err; + + tmp2.len = tmp1.len & ~(m - 1); + tmp2.data = tmp1.data; + + ret = rfc3961_calc_DK(krb5, protocol_key, &prfconstant, &derived_key, gfp); + if (ret < 0) + goto err; + + ret = rfc3961_calc_E(krb5, &derived_key, &tmp2, result, gfp); + +err: + kfree_sensitive(buffer); + return ret; +} + +/* + * Derive the Ke and Ki keys and package them into a key parameter that can be + * given to the setkey of a authenc AEAD crypto object. + */ +int authenc_derive_encrypt_keys(const struct krb5_enctype *krb5, + const struct krb5_buffer *TK, + unsigned int usage, + struct krb5_buffer *setkey, + gfp_t gfp) +{ + struct crypto_authenc_key_param *param; + struct krb5_buffer Ke, Ki; + struct rtattr *rta; + int ret; + + Ke.len = krb5->Ke_len; + Ki.len = krb5->Ki_len; + setkey->len = RTA_LENGTH(sizeof(*param)) + Ke.len + Ki.len; + setkey->data = kzalloc(setkey->len, GFP_KERNEL); + if (!setkey->data) + return -ENOMEM; + + rta = setkey->data; + rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; + rta->rta_len = RTA_LENGTH(sizeof(*param)); + param = RTA_DATA(rta); + param->enckeylen = htonl(Ke.len); + + Ki.data = (void *)(param + 1); + Ke.data = Ki.data + Ki.len; + + ret = krb5_derive_Ke(krb5, TK, usage, &Ke, gfp); + if (ret < 0) { + pr_err("get_Ke failed %d\n", ret); + return ret; + } + ret = krb5_derive_Ki(krb5, TK, usage, &Ki, gfp); + if (ret < 0) + pr_err("get_Ki failed %d\n", ret); + return ret; +} + +/* + * Package predefined Ke and Ki keys and into a key parameter that can be given + * to the setkey of an authenc AEAD crypto object. + */ +int authenc_load_encrypt_keys(const struct krb5_enctype *krb5, + const struct krb5_buffer *Ke, + const struct krb5_buffer *Ki, + struct krb5_buffer *setkey, + gfp_t gfp) +{ + struct crypto_authenc_key_param *param; + struct rtattr *rta; + + setkey->len = RTA_LENGTH(sizeof(*param)) + Ke->len + Ki->len; + setkey->data = kzalloc(setkey->len, GFP_KERNEL); + if (!setkey->data) + return -ENOMEM; + + rta = setkey->data; + rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; + rta->rta_len = RTA_LENGTH(sizeof(*param)); + param = RTA_DATA(rta); + param->enckeylen = htonl(Ke->len); + memcpy((void *)(param + 1), Ki->data, Ki->len); + memcpy((void *)(param + 1) + Ki->len, Ke->data, Ke->len); + return 0; +} + +/* + * Derive the Kc key for checksum-only mode and package it into a key parameter + * that can be given to the setkey of a hash crypto object. + */ +int rfc3961_derive_checksum_key(const struct krb5_enctype *krb5, + const struct krb5_buffer *TK, + unsigned int usage, + struct krb5_buffer *setkey, + gfp_t gfp) +{ + int ret; + + setkey->len = krb5->Kc_len; + setkey->data = kzalloc(setkey->len, GFP_KERNEL); + if (!setkey->data) + return -ENOMEM; + + ret = krb5_derive_Kc(krb5, TK, usage, setkey, gfp); + if (ret < 0) + pr_err("get_Kc failed %d\n", ret); + return ret; +} + +/* + * Package a predefined Kc key for checksum-only mode into a key parameter that + * can be given to the setkey of a hash crypto object. + */ +int rfc3961_load_checksum_key(const struct krb5_enctype *krb5, + const struct krb5_buffer *Kc, + struct krb5_buffer *setkey, + gfp_t gfp) +{ + setkey->len = krb5->Kc_len; + setkey->data = kmemdup(Kc->data, Kc->len, GFP_KERNEL); + if (!setkey->data) + return -ENOMEM; + return 0; +} + +/* + * Apply encryption and checksumming functions to part of a scatterlist. + */ +ssize_t krb5_aead_encrypt(const struct krb5_enctype *krb5, + struct crypto_aead *aead, + struct scatterlist *sg, unsigned int nr_sg, size_t sg_len, + size_t data_offset, size_t data_len, + bool preconfounded) +{ + struct aead_request *req; + ssize_t ret, done; + size_t bsize, base_len, secure_offset, secure_len, pad_len, cksum_offset; + void *buffer; + u8 *iv; + + if (WARN_ON(data_offset != krb5->conf_len)) + return -EINVAL; /* Data is in wrong place */ + + secure_offset = 0; + base_len = krb5->conf_len + data_len; + pad_len = 0; + secure_len = base_len + pad_len; + cksum_offset = secure_len; + if (WARN_ON(cksum_offset + krb5->cksum_len > sg_len)) + return -EFAULT; + + bsize = krb5_aead_size(aead) + + krb5_aead_ivsize(aead); + buffer = kzalloc(bsize, GFP_NOFS); + if (!buffer) + return -ENOMEM; + + /* Insert the confounder into the buffer */ + ret = -EFAULT; + if (!preconfounded) { + get_random_bytes(buffer, krb5->conf_len); + done = sg_pcopy_from_buffer(sg, nr_sg, buffer, krb5->conf_len, + secure_offset); + if (done != krb5->conf_len) + goto error; + } + + /* We may need to pad out to the crypto blocksize. */ + if (pad_len) { + done = sg_zero_buffer(sg, nr_sg, pad_len, data_offset + data_len); + if (done != pad_len) + goto error; + } + + /* Hash and encrypt the message. */ + req = buffer; + iv = buffer + krb5_aead_size(aead); + + aead_request_set_tfm(req, aead); + aead_request_set_callback(req, 0, NULL, NULL); + aead_request_set_crypt(req, sg, sg, secure_len, iv); + ret = crypto_aead_encrypt(req); + if (ret < 0) + goto error; + + ret = secure_len + krb5->cksum_len; + +error: + kfree_sensitive(buffer); + return ret; +} + +/* + * Apply decryption and checksumming functions to a message. The offset and + * length are updated to reflect the actual content of the encrypted region. + */ +int krb5_aead_decrypt(const struct krb5_enctype *krb5, + struct crypto_aead *aead, + struct scatterlist *sg, unsigned int nr_sg, + size_t *_offset, size_t *_len) +{ + struct aead_request *req; + size_t bsize; + void *buffer; + int ret; + u8 *iv; + + if (WARN_ON(*_offset != 0)) + return -EINVAL; /* Can't set offset on aead */ + + if (*_len < krb5->conf_len + krb5->cksum_len) + return -EPROTO; + + bsize = krb5_aead_size(aead) + + krb5_aead_ivsize(aead); + buffer = kzalloc(bsize, GFP_NOFS); + if (!buffer) + return -ENOMEM; + + /* Decrypt the message and verify its checksum. */ + req = buffer; + iv = buffer + krb5_aead_size(aead); + + aead_request_set_tfm(req, aead); + aead_request_set_callback(req, 0, NULL, NULL); + aead_request_set_crypt(req, sg, sg, *_len, iv); + ret = crypto_aead_decrypt(req); + if (ret < 0) + goto error; + + /* Adjust the boundaries of the data. */ + *_offset += krb5->conf_len; + *_len -= krb5->conf_len + krb5->cksum_len; + ret = 0; + +error: + kfree_sensitive(buffer); + return ret; +} + +/* + * Generate a checksum over some metadata and part of an skbuff and insert the + * MIC into the skbuff immediately prior to the data. + */ +ssize_t rfc3961_get_mic(const struct krb5_enctype *krb5, + struct crypto_shash *shash, + const struct krb5_buffer *metadata, + struct scatterlist *sg, unsigned int nr_sg, size_t sg_len, + size_t data_offset, size_t data_len) +{ + struct shash_desc *desc; + ssize_t ret, done; + size_t bsize; + void *buffer, *digest; + + if (WARN_ON(data_offset != krb5->cksum_len)) + return -EMSGSIZE; + + bsize = krb5_shash_size(shash) + + krb5_digest_size(shash); + buffer = kzalloc(bsize, GFP_NOFS); + if (!buffer) + return -ENOMEM; + + /* Calculate the MIC with key Kc and store it into the skb */ + desc = buffer; + desc->tfm = shash; + ret = crypto_shash_init(desc); + if (ret < 0) + goto error; + + if (metadata) { + ret = crypto_shash_update(desc, metadata->data, metadata->len); + if (ret < 0) + goto error; + } + + ret = crypto_shash_update_sg(desc, sg, data_offset, data_len); + if (ret < 0) + goto error; + + digest = buffer + krb5_shash_size(shash); + ret = crypto_shash_final(desc, digest); + if (ret < 0) + goto error; + + ret = -EFAULT; + done = sg_pcopy_from_buffer(sg, nr_sg, digest, krb5->cksum_len, + data_offset - krb5->cksum_len); + if (done != krb5->cksum_len) + goto error; + + ret = krb5->cksum_len + data_len; + +error: + kfree_sensitive(buffer); + return ret; +} + +/* + * Check the MIC on a region of an skbuff. The offset and length are updated + * to reflect the actual content of the secure region. + */ +int rfc3961_verify_mic(const struct krb5_enctype *krb5, + struct crypto_shash *shash, + const struct krb5_buffer *metadata, + struct scatterlist *sg, unsigned int nr_sg, + size_t *_offset, size_t *_len) +{ + struct shash_desc *desc; + ssize_t done; + size_t bsize, data_offset, data_len, offset = *_offset, len = *_len; + void *buffer = NULL; + int ret; + u8 *cksum, *cksum2; + + if (len < krb5->cksum_len) + return -EPROTO; + data_offset = offset + krb5->cksum_len; + data_len = len - krb5->cksum_len; + + bsize = krb5_shash_size(shash) + + krb5_digest_size(shash) * 2; + buffer = kzalloc(bsize, GFP_NOFS); + if (!buffer) + return -ENOMEM; + + cksum = buffer + + krb5_shash_size(shash); + cksum2 = buffer + + krb5_shash_size(shash) + + krb5_digest_size(shash); + + /* Calculate the MIC */ + desc = buffer; + desc->tfm = shash; + ret = crypto_shash_init(desc); + if (ret < 0) + goto error; + + if (metadata) { + ret = crypto_shash_update(desc, metadata->data, metadata->len); + if (ret < 0) + goto error; + } + + crypto_shash_update_sg(desc, sg, data_offset, data_len); + crypto_shash_final(desc, cksum); + + ret = -EFAULT; + done = sg_pcopy_to_buffer(sg, nr_sg, cksum2, krb5->cksum_len, offset); + if (done != krb5->cksum_len) + goto error; + + if (memcmp(cksum, cksum2, krb5->cksum_len) != 0) { + ret = -EBADMSG; + goto error; + } + + *_offset += krb5->cksum_len; + *_len -= krb5->cksum_len; + ret = 0; + +error: + kfree_sensitive(buffer); + return ret; +} + +const struct krb5_crypto_profile rfc3961_simplified_profile = { + .calc_PRF = rfc3961_calc_PRF, + .calc_Kc = rfc3961_calc_DK, + .calc_Ke = rfc3961_calc_DK, + .calc_Ki = rfc3961_calc_DK, + .derive_encrypt_keys = authenc_derive_encrypt_keys, + .load_encrypt_keys = authenc_load_encrypt_keys, + .derive_checksum_key = rfc3961_derive_checksum_key, + .load_checksum_key = rfc3961_load_checksum_key, + .encrypt = krb5_aead_encrypt, + .decrypt = krb5_aead_decrypt, + .get_mic = rfc3961_get_mic, + .verify_mic = rfc3961_verify_mic, +}; diff --git a/crypto/krb5/rfc3962_aes.c b/crypto/krb5/rfc3962_aes.c new file mode 100644 index 0000000000000..5cbf8f4638b9c --- /dev/null +++ b/crypto/krb5/rfc3962_aes.c @@ -0,0 +1,115 @@ +// SPDX-License-Identifier: BSD-3-Clause +/* rfc3962 Advanced Encryption Standard (AES) Encryption for Kerberos 5 + * + * Parts borrowed from net/sunrpc/auth_gss/. + */ +/* + * COPYRIGHT (c) 2008 + * The Regents of the University of Michigan + * ALL RIGHTS RESERVED + * + * Permission is granted to use, copy, create derivative works + * and redistribute this software and such derivative works + * for any purpose, so long as the name of The University of + * Michigan is not used in any advertising or publicity + * pertaining to the use of distribution of this software + * without specific, written prior authorization. If the + * above copyright notice or any other identification of the + * University of Michigan is included in any copy of any + * portion of this software, then the disclaimer below must + * also be included. + * + * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION + * FROM THE UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY + * PURPOSE, AND WITHOUT WARRANTY BY THE UNIVERSITY OF + * MICHIGAN OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING + * WITHOUT LIMITATION THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE + * REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE LIABLE + * FOR ANY DAMAGES, INCLUDING SPECIAL, INDIRECT, INCIDENTAL, OR + * CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM ARISING + * OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN + * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGES. + */ + +/* + * Copyright (C) 1998 by the FundsXpress, INC. + * + * All rights reserved. + * + * Export of this software from the United States of America may require + * a specific license from the United States Government. It is the + * responsibility of any person or organization contemplating export to + * obtain such a license before exporting. + * + * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and + * distribute this software and its documentation for any purpose and + * without fee is hereby granted, provided that the above copyright + * notice appear in all copies and that both that copyright notice and + * this permission notice appear in supporting documentation, and that + * the name of FundsXpress. not be used in advertising or publicity pertaining + * to distribution of the software without specific, written prior + * permission. FundsXpress makes no representations about the suitability of + * this software for any purpose. It is provided "as is" without express + * or implied warranty. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + +/* + * Copyright (C) 2025 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include "internal.h" + +const struct krb5_enctype krb5_aes128_cts_hmac_sha1_96 = { + .etype = KRB5_ENCTYPE_AES128_CTS_HMAC_SHA1_96, + .ctype = KRB5_CKSUMTYPE_HMAC_SHA1_96_AES128, + .name = "aes128-cts-hmac-sha1-96", + .encrypt_name = "krb5enc(hmac(sha1),cts(cbc(aes)))", + .cksum_name = "hmac(sha1)", + .hash_name = "sha1", + .derivation_enc = "cts(cbc(aes))", + .key_bytes = 16, + .key_len = 16, + .Kc_len = 16, + .Ke_len = 16, + .Ki_len = 16, + .block_len = 16, + .conf_len = 16, + .cksum_len = 12, + .hash_len = 20, + .prf_len = 16, + .keyed_cksum = true, + .random_to_key = NULL, /* Identity */ + .profile = &rfc3961_simplified_profile, +}; + +const struct krb5_enctype krb5_aes256_cts_hmac_sha1_96 = { + .etype = KRB5_ENCTYPE_AES256_CTS_HMAC_SHA1_96, + .ctype = KRB5_CKSUMTYPE_HMAC_SHA1_96_AES256, + .name = "aes256-cts-hmac-sha1-96", + .encrypt_name = "krb5enc(hmac(sha1),cts(cbc(aes)))", + .cksum_name = "hmac(sha1)", + .hash_name = "sha1", + .derivation_enc = "cts(cbc(aes))", + .key_bytes = 32, + .key_len = 32, + .Kc_len = 32, + .Ke_len = 32, + .Ki_len = 32, + .block_len = 16, + .conf_len = 16, + .cksum_len = 12, + .hash_len = 20, + .prf_len = 16, + .keyed_cksum = true, + .random_to_key = NULL, /* Identity */ + .profile = &rfc3961_simplified_profile, +}; diff --git a/crypto/krb5/rfc6803_camellia.c b/crypto/krb5/rfc6803_camellia.c new file mode 100644 index 0000000000000..77cd4ce023f18 --- /dev/null +++ b/crypto/krb5/rfc6803_camellia.c @@ -0,0 +1,237 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* rfc6803 Camellia Encryption for Kerberos 5 + * + * Copyright (C) 2025 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include "internal.h" + +/* + * Calculate the key derivation function KDF-FEEDBACK_CMAC(key, constant) + * + * n = ceiling(k / 128) + * K(0) = zeros + * K(i) = CMAC(key, K(i-1) | i | constant | 0x00 | k) + * DR(key, constant) = k-truncate(K(1) | K(2) | ... | K(n)) + * KDF-FEEDBACK-CMAC(key, constant) = random-to-key(DR(key, constant)) + * + * [rfc6803 sec 3] + */ +static int rfc6803_calc_KDF_FEEDBACK_CMAC(const struct krb5_enctype *krb5, + const struct krb5_buffer *key, + const struct krb5_buffer *constant, + struct krb5_buffer *result, + gfp_t gfp) +{ + struct crypto_shash *shash; + struct krb5_buffer K, data; + struct shash_desc *desc; + __be32 tmp; + size_t bsize, offset, seg; + void *buffer; + u32 i = 0, k = result->len * 8; + u8 *p; + int ret = -ENOMEM; + + shash = crypto_alloc_shash(krb5->cksum_name, 0, 0); + if (IS_ERR(shash)) + return (PTR_ERR(shash) == -ENOENT) ? -ENOPKG : PTR_ERR(shash); + ret = crypto_shash_setkey(shash, key->data, key->len); + if (ret < 0) + goto error_shash; + + ret = -ENOMEM; + K.len = crypto_shash_digestsize(shash); + data.len = K.len + 4 + constant->len + 1 + 4; + bsize = krb5_shash_size(shash) + + krb5_digest_size(shash) + + crypto_roundup(K.len) + + crypto_roundup(data.len); + buffer = kzalloc(bsize, GFP_NOFS); + if (!buffer) + goto error_shash; + + desc = buffer; + desc->tfm = shash; + + K.data = buffer + + krb5_shash_size(shash) + + krb5_digest_size(shash); + data.data = buffer + + krb5_shash_size(shash) + + krb5_digest_size(shash) + + crypto_roundup(K.len); + + p = data.data + K.len + 4; + memcpy(p, constant->data, constant->len); + p += constant->len; + *p++ = 0x00; + tmp = htonl(k); + memcpy(p, &tmp, 4); + p += 4; + + ret = -EINVAL; + if (WARN_ON(p - (u8 *)data.data != data.len)) + goto error; + + offset = 0; + do { + i++; + p = data.data; + memcpy(p, K.data, K.len); + p += K.len; + *(__be32 *)p = htonl(i); + + ret = crypto_shash_init(desc); + if (ret < 0) + goto error; + ret = crypto_shash_finup(desc, data.data, data.len, K.data); + if (ret < 0) + goto error; + + seg = min_t(size_t, result->len - offset, K.len); + memcpy(result->data + offset, K.data, seg); + offset += seg; + } while (offset < result->len); + +error: + kfree_sensitive(buffer); +error_shash: + crypto_free_shash(shash); + return ret; +} + +/* + * Calculate the pseudo-random function, PRF(). + * + * Kp = KDF-FEEDBACK-CMAC(protocol-key, "prf") + * PRF = CMAC(Kp, octet-string) + * [rfc6803 sec 6] + */ +static int rfc6803_calc_PRF(const struct krb5_enctype *krb5, + const struct krb5_buffer *protocol_key, + const struct krb5_buffer *octet_string, + struct krb5_buffer *result, + gfp_t gfp) +{ + static const struct krb5_buffer prfconstant = { 3, "prf" }; + struct crypto_shash *shash; + struct krb5_buffer Kp; + struct shash_desc *desc; + size_t bsize; + void *buffer; + int ret; + + Kp.len = krb5->prf_len; + + shash = crypto_alloc_shash(krb5->cksum_name, 0, 0); + if (IS_ERR(shash)) + return (PTR_ERR(shash) == -ENOENT) ? -ENOPKG : PTR_ERR(shash); + + ret = -EINVAL; + if (result->len != crypto_shash_digestsize(shash)) + goto out_shash; + + ret = -ENOMEM; + bsize = krb5_shash_size(shash) + + krb5_digest_size(shash) + + crypto_roundup(Kp.len); + buffer = kzalloc(bsize, GFP_NOFS); + if (!buffer) + goto out_shash; + + Kp.data = buffer + + krb5_shash_size(shash) + + krb5_digest_size(shash); + + ret = rfc6803_calc_KDF_FEEDBACK_CMAC(krb5, protocol_key, &prfconstant, + &Kp, gfp); + if (ret < 0) + goto out; + + ret = crypto_shash_setkey(shash, Kp.data, Kp.len); + if (ret < 0) + goto out; + + desc = buffer; + desc->tfm = shash; + ret = crypto_shash_init(desc); + if (ret < 0) + goto out; + + ret = crypto_shash_finup(desc, octet_string->data, octet_string->len, result->data); + if (ret < 0) + goto out; + +out: + kfree_sensitive(buffer); +out_shash: + crypto_free_shash(shash); + return ret; +} + + +static const struct krb5_crypto_profile rfc6803_crypto_profile = { + .calc_PRF = rfc6803_calc_PRF, + .calc_Kc = rfc6803_calc_KDF_FEEDBACK_CMAC, + .calc_Ke = rfc6803_calc_KDF_FEEDBACK_CMAC, + .calc_Ki = rfc6803_calc_KDF_FEEDBACK_CMAC, + .derive_encrypt_keys = authenc_derive_encrypt_keys, + .load_encrypt_keys = authenc_load_encrypt_keys, + .derive_checksum_key = rfc3961_derive_checksum_key, + .load_checksum_key = rfc3961_load_checksum_key, + .encrypt = krb5_aead_encrypt, + .decrypt = krb5_aead_decrypt, + .get_mic = rfc3961_get_mic, + .verify_mic = rfc3961_verify_mic, +}; + +const struct krb5_enctype krb5_camellia128_cts_cmac = { + .etype = KRB5_ENCTYPE_CAMELLIA128_CTS_CMAC, + .ctype = KRB5_CKSUMTYPE_CMAC_CAMELLIA128, + .name = "camellia128-cts-cmac", + .encrypt_name = "krb5enc(cmac(camellia),cts(cbc(camellia)))", + .cksum_name = "cmac(camellia)", + .hash_name = NULL, + .derivation_enc = "cts(cbc(camellia))", + .key_bytes = 16, + .key_len = 16, + .Kc_len = 16, + .Ke_len = 16, + .Ki_len = 16, + .block_len = 16, + .conf_len = 16, + .cksum_len = 16, + .hash_len = 16, + .prf_len = 16, + .keyed_cksum = true, + .random_to_key = NULL, /* Identity */ + .profile = &rfc6803_crypto_profile, +}; + +const struct krb5_enctype krb5_camellia256_cts_cmac = { + .etype = KRB5_ENCTYPE_CAMELLIA256_CTS_CMAC, + .ctype = KRB5_CKSUMTYPE_CMAC_CAMELLIA256, + .name = "camellia256-cts-cmac", + .encrypt_name = "krb5enc(cmac(camellia),cts(cbc(camellia)))", + .cksum_name = "cmac(camellia)", + .hash_name = NULL, + .derivation_enc = "cts(cbc(camellia))", + .key_bytes = 32, + .key_len = 32, + .Kc_len = 32, + .Ke_len = 32, + .Ki_len = 32, + .block_len = 16, + .conf_len = 16, + .cksum_len = 16, + .hash_len = 16, + .prf_len = 16, + .keyed_cksum = true, + .random_to_key = NULL, /* Identity */ + .profile = &rfc6803_crypto_profile, +}; diff --git a/crypto/krb5/rfc8009_aes2.c b/crypto/krb5/rfc8009_aes2.c new file mode 100644 index 0000000000000..d39851fc3a4ee --- /dev/null +++ b/crypto/krb5/rfc8009_aes2.c @@ -0,0 +1,362 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* rfc8009 AES Encryption with HMAC-SHA2 for Kerberos 5 + * + * Copyright (C) 2025 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include "internal.h" + +static const struct krb5_buffer rfc8009_no_context = { .len = 0, .data = "" }; + +/* + * Calculate the key derivation function KDF-HMAC-SHA2(key, label, [context,] k) + * + * KDF-HMAC-SHA2(key, label, [context,] k) = k-truncate(K1) + * + * Using the appropriate one of: + * K1 = HMAC-SHA-256(key, 0x00000001 | label | 0x00 | k) + * K1 = HMAC-SHA-384(key, 0x00000001 | label | 0x00 | k) + * K1 = HMAC-SHA-256(key, 0x00000001 | label | 0x00 | context | k) + * K1 = HMAC-SHA-384(key, 0x00000001 | label | 0x00 | context | k) + * [rfc8009 sec 3] + */ +static int rfc8009_calc_KDF_HMAC_SHA2(const struct krb5_enctype *krb5, + const struct krb5_buffer *key, + const struct krb5_buffer *label, + const struct krb5_buffer *context, + unsigned int k, + struct krb5_buffer *result, + gfp_t gfp) +{ + struct crypto_shash *shash; + struct krb5_buffer K1, data; + struct shash_desc *desc; + __be32 tmp; + size_t bsize; + void *buffer; + u8 *p; + int ret = -ENOMEM; + + if (WARN_ON(result->len != k / 8)) + return -EINVAL; + + shash = crypto_alloc_shash(krb5->cksum_name, 0, 0); + if (IS_ERR(shash)) + return (PTR_ERR(shash) == -ENOENT) ? -ENOPKG : PTR_ERR(shash); + ret = crypto_shash_setkey(shash, key->data, key->len); + if (ret < 0) + goto error_shash; + + ret = -EINVAL; + if (WARN_ON(crypto_shash_digestsize(shash) * 8 < k)) + goto error_shash; + + ret = -ENOMEM; + data.len = 4 + label->len + 1 + context->len + 4; + bsize = krb5_shash_size(shash) + + krb5_digest_size(shash) + + crypto_roundup(data.len); + buffer = kzalloc(bsize, GFP_NOFS); + if (!buffer) + goto error_shash; + + desc = buffer; + desc->tfm = shash; + ret = crypto_shash_init(desc); + if (ret < 0) + goto error; + + p = data.data = buffer + + krb5_shash_size(shash) + + krb5_digest_size(shash); + *(__be32 *)p = htonl(0x00000001); + p += 4; + memcpy(p, label->data, label->len); + p += label->len; + *p++ = 0; + memcpy(p, context->data, context->len); + p += context->len; + tmp = htonl(k); + memcpy(p, &tmp, 4); + p += 4; + + ret = -EINVAL; + if (WARN_ON(p - (u8 *)data.data != data.len)) + goto error; + + K1.len = crypto_shash_digestsize(shash); + K1.data = buffer + + krb5_shash_size(shash); + + ret = crypto_shash_finup(desc, data.data, data.len, K1.data); + if (ret < 0) + goto error; + + memcpy(result->data, K1.data, result->len); + +error: + kfree_sensitive(buffer); +error_shash: + crypto_free_shash(shash); + return ret; +} + +/* + * Calculate the pseudo-random function, PRF(). + * + * PRF = KDF-HMAC-SHA2(input-key, "prf", octet-string, 256) + * PRF = KDF-HMAC-SHA2(input-key, "prf", octet-string, 384) + * + * The "prfconstant" used in the PRF operation is the three-octet string + * "prf". + * [rfc8009 sec 5] + */ +static int rfc8009_calc_PRF(const struct krb5_enctype *krb5, + const struct krb5_buffer *input_key, + const struct krb5_buffer *octet_string, + struct krb5_buffer *result, + gfp_t gfp) +{ + static const struct krb5_buffer prfconstant = { 3, "prf" }; + + return rfc8009_calc_KDF_HMAC_SHA2(krb5, input_key, &prfconstant, + octet_string, krb5->prf_len * 8, + result, gfp); +} + +/* + * Derive Ke. + * Ke = KDF-HMAC-SHA2(base-key, usage | 0xAA, 128) + * Ke = KDF-HMAC-SHA2(base-key, usage | 0xAA, 256) + * [rfc8009 sec 5] + */ +static int rfc8009_calc_Ke(const struct krb5_enctype *krb5, + const struct krb5_buffer *base_key, + const struct krb5_buffer *usage_constant, + struct krb5_buffer *result, + gfp_t gfp) +{ + return rfc8009_calc_KDF_HMAC_SHA2(krb5, base_key, usage_constant, + &rfc8009_no_context, krb5->key_bytes * 8, + result, gfp); +} + +/* + * Derive Kc/Ki + * Kc = KDF-HMAC-SHA2(base-key, usage | 0x99, 128) + * Ki = KDF-HMAC-SHA2(base-key, usage | 0x55, 128) + * Kc = KDF-HMAC-SHA2(base-key, usage | 0x99, 192) + * Ki = KDF-HMAC-SHA2(base-key, usage | 0x55, 192) + * [rfc8009 sec 5] + */ +static int rfc8009_calc_Ki(const struct krb5_enctype *krb5, + const struct krb5_buffer *base_key, + const struct krb5_buffer *usage_constant, + struct krb5_buffer *result, + gfp_t gfp) +{ + return rfc8009_calc_KDF_HMAC_SHA2(krb5, base_key, usage_constant, + &rfc8009_no_context, krb5->cksum_len * 8, + result, gfp); +} + +/* + * Apply encryption and checksumming functions to a message. Unlike for + * RFC3961, for RFC8009, we have to chuck the starting IV into the hash first. + */ +static ssize_t rfc8009_encrypt(const struct krb5_enctype *krb5, + struct crypto_aead *aead, + struct scatterlist *sg, unsigned int nr_sg, size_t sg_len, + size_t data_offset, size_t data_len, + bool preconfounded) +{ + struct aead_request *req; + struct scatterlist bsg[2]; + ssize_t ret, done; + size_t bsize, base_len, secure_offset, secure_len, pad_len, cksum_offset; + void *buffer; + u8 *iv, *ad; + + if (WARN_ON(data_offset != krb5->conf_len)) + return -EINVAL; /* Data is in wrong place */ + + secure_offset = 0; + base_len = krb5->conf_len + data_len; + pad_len = 0; + secure_len = base_len + pad_len; + cksum_offset = secure_len; + if (WARN_ON(cksum_offset + krb5->cksum_len > sg_len)) + return -EFAULT; + + bsize = krb5_aead_size(aead) + + krb5_aead_ivsize(aead) * 2; + buffer = kzalloc(bsize, GFP_NOFS); + if (!buffer) + return -ENOMEM; + + req = buffer; + iv = buffer + krb5_aead_size(aead); + ad = buffer + krb5_aead_size(aead) + krb5_aead_ivsize(aead); + + /* Insert the confounder into the buffer */ + ret = -EFAULT; + if (!preconfounded) { + get_random_bytes(buffer, krb5->conf_len); + done = sg_pcopy_from_buffer(sg, nr_sg, buffer, krb5->conf_len, + secure_offset); + if (done != krb5->conf_len) + goto error; + } + + /* We may need to pad out to the crypto blocksize. */ + if (pad_len) { + done = sg_zero_buffer(sg, nr_sg, pad_len, data_offset + data_len); + if (done != pad_len) + goto error; + } + + /* We need to include the starting IV in the hash. */ + sg_init_table(bsg, 2); + sg_set_buf(&bsg[0], ad, krb5_aead_ivsize(aead)); + sg_chain(bsg, 2, sg); + + /* Hash and encrypt the message. */ + aead_request_set_tfm(req, aead); + aead_request_set_callback(req, 0, NULL, NULL); + aead_request_set_ad(req, krb5_aead_ivsize(aead)); + aead_request_set_crypt(req, bsg, bsg, secure_len, iv); + ret = crypto_aead_encrypt(req); + if (ret < 0) + goto error; + + ret = secure_len + krb5->cksum_len; + +error: + kfree_sensitive(buffer); + return ret; +} + +/* + * Apply decryption and checksumming functions to a message. Unlike for + * RFC3961, for RFC8009, we have to chuck the starting IV into the hash first. + * + * The offset and length are updated to reflect the actual content of the + * encrypted region. + */ +static int rfc8009_decrypt(const struct krb5_enctype *krb5, + struct crypto_aead *aead, + struct scatterlist *sg, unsigned int nr_sg, + size_t *_offset, size_t *_len) +{ + struct aead_request *req; + struct scatterlist bsg[2]; + size_t bsize; + void *buffer; + int ret; + u8 *iv, *ad; + + if (WARN_ON(*_offset != 0)) + return -EINVAL; /* Can't set offset on aead */ + + if (*_len < krb5->conf_len + krb5->cksum_len) + return -EPROTO; + + bsize = krb5_aead_size(aead) + + krb5_aead_ivsize(aead) * 2; + buffer = kzalloc(bsize, GFP_NOFS); + if (!buffer) + return -ENOMEM; + + req = buffer; + iv = buffer + krb5_aead_size(aead); + ad = buffer + krb5_aead_size(aead) + krb5_aead_ivsize(aead); + + /* We need to include the starting IV in the hash. */ + sg_init_table(bsg, 2); + sg_set_buf(&bsg[0], ad, krb5_aead_ivsize(aead)); + sg_chain(bsg, 2, sg); + + /* Decrypt the message and verify its checksum. */ + aead_request_set_tfm(req, aead); + aead_request_set_callback(req, 0, NULL, NULL); + aead_request_set_ad(req, krb5_aead_ivsize(aead)); + aead_request_set_crypt(req, bsg, bsg, *_len, iv); + ret = crypto_aead_decrypt(req); + if (ret < 0) + goto error; + + /* Adjust the boundaries of the data. */ + *_offset += krb5->conf_len; + *_len -= krb5->conf_len + krb5->cksum_len; + ret = 0; + +error: + kfree_sensitive(buffer); + return ret; +} + +static const struct krb5_crypto_profile rfc8009_crypto_profile = { + .calc_PRF = rfc8009_calc_PRF, + .calc_Kc = rfc8009_calc_Ki, + .calc_Ke = rfc8009_calc_Ke, + .calc_Ki = rfc8009_calc_Ki, + .derive_encrypt_keys = authenc_derive_encrypt_keys, + .load_encrypt_keys = authenc_load_encrypt_keys, + .derive_checksum_key = rfc3961_derive_checksum_key, + .load_checksum_key = rfc3961_load_checksum_key, + .encrypt = rfc8009_encrypt, + .decrypt = rfc8009_decrypt, + .get_mic = rfc3961_get_mic, + .verify_mic = rfc3961_verify_mic, +}; + +const struct krb5_enctype krb5_aes128_cts_hmac_sha256_128 = { + .etype = KRB5_ENCTYPE_AES128_CTS_HMAC_SHA256_128, + .ctype = KRB5_CKSUMTYPE_HMAC_SHA256_128_AES128, + .name = "aes128-cts-hmac-sha256-128", + .encrypt_name = "authenc(hmac(sha256),cts(cbc(aes)))", + .cksum_name = "hmac(sha256)", + .hash_name = "sha256", + .derivation_enc = "cts(cbc(aes))", + .key_bytes = 16, + .key_len = 16, + .Kc_len = 16, + .Ke_len = 16, + .Ki_len = 16, + .block_len = 16, + .conf_len = 16, + .cksum_len = 16, + .hash_len = 20, + .prf_len = 32, + .keyed_cksum = true, + .random_to_key = NULL, /* Identity */ + .profile = &rfc8009_crypto_profile, +}; + +const struct krb5_enctype krb5_aes256_cts_hmac_sha384_192 = { + .etype = KRB5_ENCTYPE_AES256_CTS_HMAC_SHA384_192, + .ctype = KRB5_CKSUMTYPE_HMAC_SHA384_192_AES256, + .name = "aes256-cts-hmac-sha384-192", + .encrypt_name = "authenc(hmac(sha384),cts(cbc(aes)))", + .cksum_name = "hmac(sha384)", + .hash_name = "sha384", + .derivation_enc = "cts(cbc(aes))", + .key_bytes = 32, + .key_len = 32, + .Kc_len = 24, + .Ke_len = 32, + .Ki_len = 24, + .block_len = 16, + .conf_len = 16, + .cksum_len = 24, + .hash_len = 20, + .prf_len = 48, + .keyed_cksum = true, + .random_to_key = NULL, /* Identity */ + .profile = &rfc8009_crypto_profile, +}; diff --git a/crypto/krb5/selftest.c b/crypto/krb5/selftest.c new file mode 100644 index 0000000000000..4519c572d37ef --- /dev/null +++ b/crypto/krb5/selftest.c @@ -0,0 +1,545 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Kerberos library self-testing + * + * Copyright (C) 2025 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include "internal.h" + +#define VALID(X) \ + ({ \ + bool __x = (X); \ + if (__x) { \ + pr_warn("!!! TESTINVAL %s:%u\n", __FILE__, __LINE__); \ + ret = -EBADMSG; \ + } \ + __x; \ + }) + +#define CHECK(X) \ + ({ \ + bool __x = (X); \ + if (__x) { \ + pr_warn("!!! TESTFAIL %s:%u\n", __FILE__, __LINE__); \ + ret = -EBADMSG; \ + } \ + __x; \ + }) + +enum which_key { + TEST_KC, TEST_KE, TEST_KI, +}; + +#if 0 +static void dump_sg(struct scatterlist *sg, unsigned int limit) +{ + unsigned int index = 0, n = 0; + + for (; sg && limit > 0; sg = sg_next(sg)) { + unsigned int off = sg->offset, len = umin(sg->length, limit); + const void *p = kmap_local_page(sg_page(sg)); + + limit -= len; + while (len > 0) { + unsigned int part = umin(len, 32); + + pr_notice("[%x] %04x: %*phN\n", n, index, part, p + off); + index += part; + off += part; + len -= part; + } + + kunmap_local(p); + n++; + } +} +#endif + +static int prep_buf(struct krb5_buffer *buf) +{ + buf->data = kmalloc(buf->len, GFP_KERNEL); + if (!buf->data) + return -ENOMEM; + return 0; +} + +#define PREP_BUF(BUF, LEN) \ + do { \ + (BUF)->len = (LEN); \ + ret = prep_buf((BUF)); \ + if (ret < 0) \ + goto out; \ + } while (0) + +static int load_buf(struct krb5_buffer *buf, const char *from) +{ + size_t len = strlen(from); + int ret; + + if (len > 1 && from[0] == '\'') { + PREP_BUF(buf, len - 1); + memcpy(buf->data, from + 1, len - 1); + ret = 0; + goto out; + } + + if (VALID(len & 1)) + return -EINVAL; + + PREP_BUF(buf, len / 2); + ret = hex2bin(buf->data, from, buf->len); + if (ret < 0) { + VALID(1); + goto out; + } +out: + return ret; +} + +#define LOAD_BUF(BUF, FROM) do { ret = load_buf(BUF, FROM); if (ret < 0) goto out; } while (0) + +static void clear_buf(struct krb5_buffer *buf) +{ + kfree(buf->data); + buf->len = 0; + buf->data = NULL; +} + +/* + * Perform a pseudo-random function check. + */ +static int krb5_test_one_prf(const struct krb5_prf_test *test) +{ + const struct krb5_enctype *krb5 = crypto_krb5_find_enctype(test->etype); + struct krb5_buffer key = {}, octet = {}, result = {}, prf = {}; + int ret; + + if (!krb5) + return -EOPNOTSUPP; + + pr_notice("Running %s %s\n", krb5->name, test->name); + + LOAD_BUF(&key, test->key); + LOAD_BUF(&octet, test->octet); + LOAD_BUF(&prf, test->prf); + PREP_BUF(&result, krb5->prf_len); + + if (VALID(result.len != prf.len)) { + ret = -EINVAL; + goto out; + } + + ret = krb5->profile->calc_PRF(krb5, &key, &octet, &result, GFP_KERNEL); + if (ret < 0) { + CHECK(1); + pr_warn("PRF calculation failed %d\n", ret); + goto out; + } + + if (memcmp(result.data, prf.data, result.len) != 0) { + CHECK(1); + ret = -EKEYREJECTED; + goto out; + } + + ret = 0; + +out: + clear_buf(&result); + clear_buf(&prf); + clear_buf(&octet); + clear_buf(&key); + return ret; +} + +/* + * Perform a key derivation check. + */ +static int krb5_test_key(const struct krb5_enctype *krb5, + const struct krb5_buffer *base_key, + const struct krb5_key_test_one *test, + enum which_key which) +{ + struct krb5_buffer key = {}, result = {}; + int ret; + + LOAD_BUF(&key, test->key); + PREP_BUF(&result, key.len); + + switch (which) { + case TEST_KC: + ret = krb5_derive_Kc(krb5, base_key, test->use, &result, GFP_KERNEL); + break; + case TEST_KE: + ret = krb5_derive_Ke(krb5, base_key, test->use, &result, GFP_KERNEL); + break; + case TEST_KI: + ret = krb5_derive_Ki(krb5, base_key, test->use, &result, GFP_KERNEL); + break; + default: + VALID(1); + ret = -EINVAL; + goto out; + } + + if (ret < 0) { + CHECK(1); + pr_warn("Key derivation failed %d\n", ret); + goto out; + } + + if (memcmp(result.data, key.data, result.len) != 0) { + CHECK(1); + ret = -EKEYREJECTED; + goto out; + } + +out: + clear_buf(&key); + clear_buf(&result); + return ret; +} + +static int krb5_test_one_key(const struct krb5_key_test *test) +{ + const struct krb5_enctype *krb5 = crypto_krb5_find_enctype(test->etype); + struct krb5_buffer base_key = {}; + int ret; + + if (!krb5) + return -EOPNOTSUPP; + + pr_notice("Running %s %s\n", krb5->name, test->name); + + LOAD_BUF(&base_key, test->key); + + ret = krb5_test_key(krb5, &base_key, &test->Kc, TEST_KC); + if (ret < 0) + goto out; + ret = krb5_test_key(krb5, &base_key, &test->Ke, TEST_KE); + if (ret < 0) + goto out; + ret = krb5_test_key(krb5, &base_key, &test->Ki, TEST_KI); + if (ret < 0) + goto out; + +out: + clear_buf(&base_key); + return ret; +} + +/* + * Perform an encryption test. + */ +static int krb5_test_one_enc(const struct krb5_enc_test *test, void *buf) +{ + const struct krb5_enctype *krb5 = crypto_krb5_find_enctype(test->etype); + struct crypto_aead *ci = NULL; + struct krb5_buffer K0 = {}, Ke = {}, Ki = {}, keys = {}; + struct krb5_buffer conf = {}, plain = {}, ct = {}; + struct scatterlist sg[1]; + size_t data_len, data_offset, message_len; + int ret; + + if (!krb5) + return -EOPNOTSUPP; + + pr_notice("Running %s %s\n", krb5->name, test->name); + + /* Load the test data into binary buffers. */ + LOAD_BUF(&conf, test->conf); + LOAD_BUF(&plain, test->plain); + LOAD_BUF(&ct, test->ct); + + if (test->K0) { + LOAD_BUF(&K0, test->K0); + } else { + LOAD_BUF(&Ke, test->Ke); + LOAD_BUF(&Ki, test->Ki); + + ret = krb5->profile->load_encrypt_keys(krb5, &Ke, &Ki, &keys, GFP_KERNEL); + if (ret < 0) + goto out; + } + + if (VALID(conf.len != krb5->conf_len) || + VALID(ct.len != krb5->conf_len + plain.len + krb5->cksum_len)) + goto out; + + data_len = plain.len; + message_len = crypto_krb5_how_much_buffer(krb5, KRB5_ENCRYPT_MODE, + data_len, &data_offset); + + if (CHECK(message_len != ct.len)) { + pr_warn("Encrypted length mismatch %zu != %u\n", message_len, ct.len); + goto out; + } + if (CHECK(data_offset != conf.len)) { + pr_warn("Data offset mismatch %zu != %u\n", data_offset, conf.len); + goto out; + } + + memcpy(buf, conf.data, conf.len); + memcpy(buf + data_offset, plain.data, plain.len); + + /* Allocate a crypto object and set its key. */ + if (test->K0) + ci = crypto_krb5_prepare_encryption(krb5, &K0, test->usage, GFP_KERNEL); + else + ci = krb5_prepare_encryption(krb5, &keys, GFP_KERNEL); + + if (IS_ERR(ci)) { + ret = PTR_ERR(ci); + ci = NULL; + pr_err("Couldn't alloc AEAD %s: %d\n", krb5->encrypt_name, ret); + goto out; + } + + /* Encrypt the message. */ + sg_init_one(sg, buf, message_len); + ret = crypto_krb5_encrypt(krb5, ci, sg, 1, message_len, + data_offset, data_len, true); + if (ret < 0) { + CHECK(1); + pr_warn("Encryption failed %d\n", ret); + goto out; + } + if (ret != message_len) { + CHECK(1); + pr_warn("Encrypted message wrong size %x != %zx\n", ret, message_len); + goto out; + } + + if (memcmp(buf, ct.data, ct.len) != 0) { + CHECK(1); + pr_warn("Ciphertext mismatch\n"); + pr_warn("BUF %*phN\n", ct.len, buf); + pr_warn("CT %*phN\n", ct.len, ct.data); + pr_warn("PT %*phN%*phN\n", conf.len, conf.data, plain.len, plain.data); + ret = -EKEYREJECTED; + goto out; + } + + /* Decrypt the encrypted message. */ + data_offset = 0; + data_len = message_len; + ret = crypto_krb5_decrypt(krb5, ci, sg, 1, &data_offset, &data_len); + if (ret < 0) { + CHECK(1); + pr_warn("Decryption failed %d\n", ret); + goto out; + } + + if (CHECK(data_offset != conf.len) || + CHECK(data_len != plain.len)) + goto out; + + if (memcmp(buf, conf.data, conf.len) != 0) { + CHECK(1); + pr_warn("Confounder mismatch\n"); + pr_warn("ENC %*phN\n", conf.len, buf); + pr_warn("DEC %*phN\n", conf.len, conf.data); + ret = -EKEYREJECTED; + goto out; + } + + if (memcmp(buf + conf.len, plain.data, plain.len) != 0) { + CHECK(1); + pr_warn("Plaintext mismatch\n"); + pr_warn("BUF %*phN\n", plain.len, buf + conf.len); + pr_warn("PT %*phN\n", plain.len, plain.data); + ret = -EKEYREJECTED; + goto out; + } + + ret = 0; + +out: + clear_buf(&ct); + clear_buf(&plain); + clear_buf(&conf); + clear_buf(&keys); + clear_buf(&Ki); + clear_buf(&Ke); + clear_buf(&K0); + if (ci) + crypto_free_aead(ci); + return ret; +} + +/* + * Perform a checksum test. + */ +static int krb5_test_one_mic(const struct krb5_mic_test *test, void *buf) +{ + const struct krb5_enctype *krb5 = crypto_krb5_find_enctype(test->etype); + struct crypto_shash *ci = NULL; + struct scatterlist sg[1]; + struct krb5_buffer K0 = {}, Kc = {}, keys = {}, plain = {}, mic = {}; + size_t offset, len, message_len; + int ret; + + if (!krb5) + return -EOPNOTSUPP; + + pr_notice("Running %s %s\n", krb5->name, test->name); + + /* Allocate a crypto object and set its key. */ + if (test->K0) { + LOAD_BUF(&K0, test->K0); + ci = crypto_krb5_prepare_checksum(krb5, &K0, test->usage, GFP_KERNEL); + } else { + LOAD_BUF(&Kc, test->Kc); + + ret = krb5->profile->load_checksum_key(krb5, &Kc, &keys, GFP_KERNEL); + if (ret < 0) + goto out; + + ci = krb5_prepare_checksum(krb5, &Kc, GFP_KERNEL); + } + if (IS_ERR(ci)) { + ret = PTR_ERR(ci); + ci = NULL; + pr_err("Couldn't alloc shash %s: %d\n", krb5->cksum_name, ret); + goto out; + } + + /* Load the test data into binary buffers. */ + LOAD_BUF(&plain, test->plain); + LOAD_BUF(&mic, test->mic); + + len = plain.len; + message_len = crypto_krb5_how_much_buffer(krb5, KRB5_CHECKSUM_MODE, + len, &offset); + + if (CHECK(message_len != mic.len + plain.len)) { + pr_warn("MIC length mismatch %zu != %u\n", + message_len, mic.len + plain.len); + goto out; + } + + memcpy(buf + offset, plain.data, plain.len); + + /* Generate a MIC generation request. */ + sg_init_one(sg, buf, 1024); + + ret = crypto_krb5_get_mic(krb5, ci, NULL, sg, 1, 1024, + krb5->cksum_len, plain.len); + if (ret < 0) { + CHECK(1); + pr_warn("Get MIC failed %d\n", ret); + goto out; + } + len = ret; + + if (CHECK(len != plain.len + mic.len)) { + pr_warn("MIC length mismatch %zu != %u\n", len, plain.len + mic.len); + goto out; + } + + if (memcmp(buf, mic.data, mic.len) != 0) { + CHECK(1); + pr_warn("MIC mismatch\n"); + pr_warn("BUF %*phN\n", mic.len, buf); + pr_warn("MIC %*phN\n", mic.len, mic.data); + ret = -EKEYREJECTED; + goto out; + } + + /* Generate a verification request. */ + offset = 0; + ret = crypto_krb5_verify_mic(krb5, ci, NULL, sg, 1, &offset, &len); + if (ret < 0) { + CHECK(1); + pr_warn("Verify MIC failed %d\n", ret); + goto out; + } + + if (CHECK(offset != mic.len) || + CHECK(len != plain.len)) + goto out; + + if (memcmp(buf + offset, plain.data, plain.len) != 0) { + CHECK(1); + pr_warn("Plaintext mismatch\n"); + pr_warn("BUF %*phN\n", plain.len, buf + offset); + pr_warn("PT %*phN\n", plain.len, plain.data); + ret = -EKEYREJECTED; + goto out; + } + + ret = 0; + +out: + clear_buf(&mic); + clear_buf(&plain); + clear_buf(&keys); + clear_buf(&K0); + clear_buf(&Kc); + if (ci) + crypto_free_shash(ci); + return ret; +} + +int krb5_selftest(void) +{ + void *buf; + int ret = 0, i; + + buf = kmalloc(4096, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + pr_notice("\n"); + pr_notice("Running selftests\n"); + + for (i = 0; krb5_prf_tests[i].name; i++) { + ret = krb5_test_one_prf(&krb5_prf_tests[i]); + if (ret < 0) { + if (ret != -EOPNOTSUPP) + goto out; + pr_notice("Skipping %s\n", krb5_prf_tests[i].name); + } + } + + for (i = 0; krb5_key_tests[i].name; i++) { + ret = krb5_test_one_key(&krb5_key_tests[i]); + if (ret < 0) { + if (ret != -EOPNOTSUPP) + goto out; + pr_notice("Skipping %s\n", krb5_key_tests[i].name); + } + } + + for (i = 0; krb5_enc_tests[i].name; i++) { + memset(buf, 0x5a, 4096); + ret = krb5_test_one_enc(&krb5_enc_tests[i], buf); + if (ret < 0) { + if (ret != -EOPNOTSUPP) + goto out; + pr_notice("Skipping %s\n", krb5_enc_tests[i].name); + } + } + + for (i = 0; krb5_mic_tests[i].name; i++) { + memset(buf, 0x5a, 4096); + ret = krb5_test_one_mic(&krb5_mic_tests[i], buf); + if (ret < 0) { + if (ret != -EOPNOTSUPP) + goto out; + pr_notice("Skipping %s\n", krb5_mic_tests[i].name); + } + } + + ret = 0; +out: + pr_notice("Selftests %s\n", ret == 0 ? "succeeded" : "failed"); + kfree(buf); + return ret; +} diff --git a/crypto/krb5/selftest_data.c b/crypto/krb5/selftest_data.c new file mode 100644 index 0000000000000..24447ee8bf077 --- /dev/null +++ b/crypto/krb5/selftest_data.c @@ -0,0 +1,291 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Data for Kerberos library self-testing + * + * Copyright (C) 2025 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include "internal.h" + +/* + * Pseudo-random function tests. + */ +const struct krb5_prf_test krb5_prf_tests[] = { + /* rfc8009 Appendix A */ + { + .etype = KRB5_ENCTYPE_AES128_CTS_HMAC_SHA256_128, + .name = "prf", + .key = "3705D96080C17728A0E800EAB6E0D23C", + .octet = "74657374", + .prf = "9D188616F63852FE86915BB840B4A886FF3E6BB0F819B49B893393D393854295", + }, { + .etype = KRB5_ENCTYPE_AES256_CTS_HMAC_SHA384_192, + .name = "prf", + .key = "6D404D37FAF79F9DF0D33568D320669800EB4836472EA8A026D16B7182460C52", + .octet = "74657374", + .prf = + "9801F69A368C2BF675E59521E177D9A07F67EFE1CFDE8D3C8D6F6A0256E3B17D" + "B3C1B62AD1B8553360D17367EB1514D2", + }, + {/* END */} +}; + +/* + * Key derivation tests. + */ +const struct krb5_key_test krb5_key_tests[] = { + /* rfc8009 Appendix A */ + { + .etype = KRB5_ENCTYPE_AES128_CTS_HMAC_SHA256_128, + .name = "key", + .key = "3705D96080C17728A0E800EAB6E0D23C", + .Kc.use = 0x00000002, + .Kc.key = "B31A018A48F54776F403E9A396325DC3", + .Ke.use = 0x00000002, + .Ke.key = "9B197DD1E8C5609D6E67C3E37C62C72E", + .Ki.use = 0x00000002, + .Ki.key = "9FDA0E56AB2D85E1569A688696C26A6C", + }, { + .etype = KRB5_ENCTYPE_AES256_CTS_HMAC_SHA384_192, + .name = "key", + .key = "6D404D37FAF79F9DF0D33568D320669800EB4836472EA8A026D16B7182460C52", + .Kc.use = 0x00000002, + .Kc.key = "EF5718BE86CC84963D8BBB5031E9F5C4BA41F28FAF69E73D", + .Ke.use = 0x00000002, + .Ke.key = "56AB22BEE63D82D7BC5227F6773F8EA7A5EB1C825160C38312980C442E5C7E49", + .Ki.use = 0x00000002, + .Ki.key = "69B16514E3CD8E56B82010D5C73012B622C4D00FFC23ED1F", + }, + /* rfc6803 sec 10 */ + { + .etype = KRB5_ENCTYPE_CAMELLIA128_CTS_CMAC, + .name = "key", + .key = "57D0297298FFD9D35DE5A47FB4BDE24B", + .Kc.use = 0x00000002, + .Kc.key = "D155775A209D05F02B38D42A389E5A56", + .Ke.use = 0x00000002, + .Ke.key = "64DF83F85A532F17577D8C37035796AB", + .Ki.use = 0x00000002, + .Ki.key = "3E4FBDF30FB8259C425CB6C96F1F4635", + }, + { + .etype = KRB5_ENCTYPE_CAMELLIA256_CTS_CMAC, + .name = "key", + .key = "B9D6828B2056B7BE656D88A123B1FAC68214AC2B727ECF5F69AFE0C4DF2A6D2C", + .Kc.use = 0x00000002, + .Kc.key = "E467F9A9552BC7D3155A6220AF9C19220EEED4FF78B0D1E6A1544991461A9E50", + .Ke.use = 0x00000002, + .Ke.key = "412AEFC362A7285FC3966C6A5181E7605AE675235B6D549FBFC9AB6630A4C604", + .Ki.use = 0x00000002, + .Ki.key = "FA624FA0E523993FA388AEFDC67E67EBCD8C08E8A0246B1D73B0D1DD9FC582B0", + }, + {/* END */} +}; + +/* + * Encryption tests. + */ +const struct krb5_enc_test krb5_enc_tests[] = { + /* rfc8009 Appendix A */ + { + .etype = KRB5_ENCTYPE_AES128_CTS_HMAC_SHA256_128, + .name = "enc no plain", + .plain = "", + .conf = "7E5895EAF2672435BAD817F545A37148", + .Ke = "9B197DD1E8C5609D6E67C3E37C62C72E", + .Ki = "9FDA0E56AB2D85E1569A688696C26A6C", + .ct = "EF85FB890BB8472F4DAB20394DCA781DAD877EDA39D50C870C0D5A0A8E48C718", + }, { + .etype = KRB5_ENCTYPE_AES128_CTS_HMAC_SHA256_128, + .name = "enc plain + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct krb5enc_instance_ctx { + struct crypto_ahash_spawn auth; + struct crypto_skcipher_spawn enc; + unsigned int reqoff; +}; + +struct krb5enc_ctx { + struct crypto_ahash *auth; + struct crypto_skcipher *enc; +}; + +struct krb5enc_request_ctx { + struct scatterlist src[2]; + struct scatterlist dst[2]; + char tail[]; +}; + +/** + * crypto_krb5enc_extractkeys - Extract Ke and Ki keys from the key blob. + * @keys: Where to put the key sizes and pointers + * @key: Encoded key material + * @keylen: Amount of key material + * + * Decode the key blob we're given. It starts with an rtattr that indicates + * the format and the length. Format CRYPTO_AUTHENC_KEYA_PARAM is: + * + * rtattr || __be32 enckeylen || authkey || enckey + * + * Note that the rtattr is in cpu-endian form, unlike enckeylen. This must be + * handled correctly in static testmgr data. + */ +int crypto_krb5enc_extractkeys(struct crypto_authenc_keys *keys, const u8 *key, + unsigned int keylen) +{ + struct rtattr *rta = (struct rtattr *)key; + struct crypto_authenc_key_param *param; + + if (!RTA_OK(rta, keylen)) + return -EINVAL; + if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM) + return -EINVAL; + + /* + * RTA_OK() didn't align the rtattr's payload when validating that it + * fits in the buffer. Yet, the keys should start on the next 4-byte + * aligned boundary. To avoid confusion, require that the rtattr + * payload be exactly the param struct, which has a 4-byte aligned size. + */ + if (RTA_PAYLOAD(rta) != sizeof(*param)) + return -EINVAL; + BUILD_BUG_ON(sizeof(*param) % RTA_ALIGNTO); + + param = RTA_DATA(rta); + keys->enckeylen = be32_to_cpu(param->enckeylen); + + key += rta->rta_len; + keylen -= rta->rta_len; + + if (keylen < keys->enckeylen) + return -EINVAL; + + keys->authkeylen = keylen - keys->enckeylen; + keys->authkey = key; + keys->enckey = key + keys->authkeylen; + return 0; +} +EXPORT_SYMBOL(crypto_krb5enc_extractkeys); + +static int krb5enc_setkey(struct crypto_aead *krb5enc, const u8 *key, + unsigned int keylen) +{ + struct crypto_authenc_keys keys; + struct krb5enc_ctx *ctx = crypto_aead_ctx(krb5enc); + struct crypto_skcipher *enc = ctx->enc; + struct crypto_ahash *auth = ctx->auth; + unsigned int flags = crypto_aead_get_flags(krb5enc); + int err = -EINVAL; + + if (crypto_krb5enc_extractkeys(&keys, key, keylen) != 0) + goto out; + + crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK); + crypto_ahash_set_flags(auth, flags & CRYPTO_TFM_REQ_MASK); + err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen); + if (err) + goto out; + + crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK); + crypto_skcipher_set_flags(enc, flags & CRYPTO_TFM_REQ_MASK); + err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen); +out: + memzero_explicit(&keys, sizeof(keys)); + return err; +} + +static void krb5enc_encrypt_done(struct crypto_async_request *areq, int err) +{ + struct aead_request *req = areq->data; + + aead_request_complete(req, err); +} + +/* + * Start the encryption of the plaintext. We skip over the associated data as + * that only gets included in the hash. + */ +static int krb5enc_dispatch_encrypt(struct aead_request *req, + unsigned int flags) +{ + struct crypto_aead *krb5enc = crypto_aead_reqtfm(req); + struct aead_instance *inst = aead_alg_instance(krb5enc); + struct krb5enc_ctx *ctx = crypto_aead_ctx(krb5enc); + struct krb5enc_instance_ctx *ictx = aead_instance_ctx(inst); + struct krb5enc_request_ctx *areq_ctx = aead_request_ctx(req); + struct crypto_skcipher *enc = ctx->enc; + struct skcipher_request *skreq = (void *)(areq_ctx->tail + + ictx->reqoff); + struct scatterlist *src, *dst; + + src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen); + if (req->src == req->dst) + dst = src; + else + dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->assoclen); + + skcipher_request_set_tfm(skreq, enc); + skcipher_request_set_callback(skreq, flags, + krb5enc_encrypt_done, req); + skcipher_request_set_crypt(skreq, src, dst, req->cryptlen, req->iv); + + return crypto_skcipher_encrypt(skreq); +} + +/* + * Insert the hash into the checksum field in the destination buffer directly + * after the encrypted region. + */ +static void krb5enc_insert_checksum(struct aead_request *req, u8 *hash) +{ + struct crypto_aead *krb5enc = crypto_aead_reqtfm(req); + + scatterwalk_map_and_copy(hash, req->dst, + req->assoclen + req->cryptlen, + crypto_aead_authsize(krb5enc), 1); +} + +/* + * Upon completion of an asynchronous digest, transfer the hash to the checksum + * field. + */ +static void krb5enc_encrypt_ahash_done(struct crypto_async_request *areq, + int err) +{ + struct aead_request *req = areq->data; + struct crypto_aead *krb5enc = crypto_aead_reqtfm(req); + struct aead_instance *inst = aead_alg_instance(krb5enc); + struct krb5enc_instance_ctx *ictx = aead_instance_ctx(inst); + struct krb5enc_request_ctx *areq_ctx = aead_request_ctx(req); + struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff); + + if (err) + goto out; + + krb5enc_insert_checksum(req, ahreq->result); + + err = krb5enc_dispatch_encrypt(req, 0); + if (err == -EINPROGRESS) + return; + +out: + aead_request_complete(req, err); +} + +/* + * Start the digest of the plaintext for encryption. In theory, this could be + * run in parallel with the encryption, provided the src and dst buffers don't + * overlap. + */ +static int krb5enc_dispatch_encrypt_hash(struct aead_request *req) +{ + struct crypto_aead *krb5enc = crypto_aead_reqtfm(req); + struct aead_instance *inst = aead_alg_instance(krb5enc); + struct krb5enc_ctx *ctx = crypto_aead_ctx(krb5enc); + struct krb5enc_instance_ctx *ictx = aead_instance_ctx(inst); + struct crypto_ahash *auth = ctx->auth; + struct krb5enc_request_ctx *areq_ctx = aead_request_ctx(req); + struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff); + u8 *hash = areq_ctx->tail; + int err; + + ahash_request_set_callback(ahreq, aead_request_flags(req), + krb5enc_encrypt_ahash_done, req); + ahash_request_set_tfm(ahreq, auth); + ahash_request_set_crypt(ahreq, req->src, hash, req->assoclen + req->cryptlen); + + err = crypto_ahash_digest(ahreq); + if (err) + return err; + + krb5enc_insert_checksum(req, hash); + return 0; +} + +/* + * Process an encryption operation. We can perform the cipher and the hash in + * parallel, provided the src and dst buffers are separate. + */ +static int krb5enc_encrypt(struct aead_request *req) +{ + int err; + + err = krb5enc_dispatch_encrypt_hash(req); + if (err < 0) + return err; + + return krb5enc_dispatch_encrypt(req, aead_request_flags(req)); +} + +static int krb5enc_verify_hash(struct aead_request *req) +{ + struct crypto_aead *krb5enc = crypto_aead_reqtfm(req); + struct aead_instance *inst = aead_alg_instance(krb5enc); + struct krb5enc_instance_ctx *ictx = aead_instance_ctx(inst); + struct krb5enc_request_ctx *areq_ctx = aead_request_ctx(req); + struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff); + unsigned int authsize = crypto_aead_authsize(krb5enc); + u8 *calc_hash = areq_ctx->tail; + u8 *msg_hash = areq_ctx->tail + authsize; + + scatterwalk_map_and_copy(msg_hash, req->src, ahreq->nbytes, authsize, 0); + + if (crypto_memneq(msg_hash, calc_hash, authsize)) + return -EBADMSG; + return 0; +} + +static void krb5enc_decrypt_hash_done(struct crypto_async_request *areq, + int err) +{ + struct aead_request *req = areq->data; + + if (!err) + err = krb5enc_verify_hash(req); + aead_request_complete(req, err); +} + +/* + * Dispatch the hashing of the plaintext after we've done the decryption. + */ +static int krb5enc_dispatch_decrypt_hash(struct aead_request *req, + unsigned int flags) +{ + struct crypto_aead *krb5enc = crypto_aead_reqtfm(req); + struct aead_instance *inst = aead_alg_instance(krb5enc); + struct krb5enc_ctx *ctx = crypto_aead_ctx(krb5enc); + struct krb5enc_instance_ctx *ictx = aead_instance_ctx(inst); + struct krb5enc_request_ctx *areq_ctx = aead_request_ctx(req); + struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff); + struct crypto_ahash *auth = ctx->auth; + unsigned int authsize = crypto_aead_authsize(krb5enc); + u8 *hash = areq_ctx->tail; + int err; + + ahash_request_set_tfm(ahreq, auth); + ahash_request_set_crypt(ahreq, req->dst, hash, + req->assoclen + req->cryptlen - authsize); + ahash_request_set_callback(ahreq, flags, + krb5enc_decrypt_hash_done, req); + + err = crypto_ahash_digest(ahreq); + if (err < 0) + return err; + + return krb5enc_verify_hash(req); +} + +static void krb5enc_decrypt_done(struct crypto_async_request *areq, int err) +{ + struct aead_request *req = areq->data; + + if (err) + goto out; + + err = krb5enc_dispatch_decrypt_hash(req, 0); + if (err == -EINPROGRESS) + return; + +out: + aead_request_complete(req, err); +} + +/* + * Dispatch the decryption of the ciphertext. + */ +static int krb5enc_dispatch_decrypt(struct aead_request *req) +{ + struct crypto_aead *krb5enc = crypto_aead_reqtfm(req); + struct aead_instance *inst = aead_alg_instance(krb5enc); + struct krb5enc_ctx *ctx = crypto_aead_ctx(krb5enc); + struct krb5enc_instance_ctx *ictx = aead_instance_ctx(inst); + struct krb5enc_request_ctx *areq_ctx = aead_request_ctx(req); + struct skcipher_request *skreq = (void *)(areq_ctx->tail + + ictx->reqoff); + unsigned int authsize = crypto_aead_authsize(krb5enc); + struct scatterlist *src, *dst; + + src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen); + dst = src; + + if (req->src != req->dst) + dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->assoclen); + + skcipher_request_set_tfm(skreq, ctx->enc); + skcipher_request_set_callback(skreq, aead_request_flags(req), + krb5enc_decrypt_done, req); + skcipher_request_set_crypt(skreq, src, dst, + req->cryptlen - authsize, req->iv); + + return crypto_skcipher_decrypt(skreq); +} + +static int krb5enc_decrypt(struct aead_request *req) +{ + int err; + + err = krb5enc_dispatch_decrypt(req); + if (err < 0) + return err; + + return krb5enc_dispatch_decrypt_hash(req, aead_request_flags(req)); +} + +static int krb5enc_init_tfm(struct crypto_aead *tfm) +{ + struct aead_instance *inst = aead_alg_instance(tfm); + struct krb5enc_instance_ctx *ictx = aead_instance_ctx(inst); + struct krb5enc_ctx *ctx = crypto_aead_ctx(tfm); + struct crypto_ahash *auth; + struct crypto_skcipher *enc; + int err; + + auth = crypto_spawn_ahash(&ictx->auth); + if (IS_ERR(auth)) + return PTR_ERR(auth); + + enc = crypto_spawn_skcipher(&ictx->enc); + err = PTR_ERR(enc); + if (IS_ERR(enc)) + goto err_free_ahash; + + ctx->auth = auth; + ctx->enc = enc; + + crypto_aead_set_reqsize( + tfm, + sizeof(struct krb5enc_request_ctx) + + ictx->reqoff + /* Space for two checksums */ + umax(sizeof(struct ahash_request) + crypto_ahash_reqsize(auth), + sizeof(struct skcipher_request) + crypto_skcipher_reqsize(enc))); + + return 0; + +err_free_ahash: + crypto_free_ahash(auth); + return err; +} + +static void krb5enc_exit_tfm(struct crypto_aead *tfm) +{ + struct krb5enc_ctx *ctx = crypto_aead_ctx(tfm); + + crypto_free_ahash(ctx->auth); + crypto_free_skcipher(ctx->enc); +} + +static void krb5enc_free(struct aead_instance *inst) +{ + struct krb5enc_instance_ctx *ctx = aead_instance_ctx(inst); + + crypto_drop_skcipher(&ctx->enc); + crypto_drop_ahash(&ctx->auth); + kfree(inst); +} + +/* + * Create an instance of a template for a specific hash and cipher pair. + */ +static int krb5enc_create(struct crypto_template *tmpl, struct rtattr **tb) +{ + struct krb5enc_instance_ctx *ictx; + struct skcipher_alg *enc; + struct hash_alg_common *auth; + struct aead_instance *inst; + struct crypto_alg *auth_base; + u32 mask; + int err; + + err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask); + if (err) { + pr_err("attr_type failed\n"); + return err; + } + + inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL); + if (!inst) + return -ENOMEM; + ictx = aead_instance_ctx(inst); + + err = crypto_grab_ahash(&ictx->auth, aead_crypto_instance(inst), + crypto_attr_alg_name(tb[1]), 0, mask); + if (err) { + pr_err("grab ahash failed\n"); + goto err_free_inst; + } + auth = crypto_spawn_ahash_alg(&ictx->auth); + auth_base = &auth->base; + + err = crypto_grab_skcipher(&ictx->enc, aead_crypto_instance(inst), + crypto_attr_alg_name(tb[2]), 0, mask); + if (err) { + pr_err("grab skcipher failed\n"); + goto err_free_inst; + } + enc = crypto_spawn_skcipher_alg(&ictx->enc); + + ictx->reqoff = 2 * auth->digestsize; + + err = -ENAMETOOLONG; + if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, + "krb5enc(%s,%s)", auth_base->cra_name, + enc->base.cra_name) >= + CRYPTO_MAX_ALG_NAME) + goto err_free_inst; + + if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, + "krb5enc(%s,%s)", auth_base->cra_driver_name, + enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) + goto err_free_inst; + + inst->alg.base.cra_priority = enc->base.cra_priority * 10 + + auth_base->cra_priority; + inst->alg.base.cra_blocksize = enc->base.cra_blocksize; + inst->alg.base.cra_alignmask = enc->base.cra_alignmask; + inst->alg.base.cra_ctxsize = sizeof(struct krb5enc_ctx); + + inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc); + inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc); + inst->alg.maxauthsize = auth->digestsize; + + inst->alg.init = krb5enc_init_tfm; + inst->alg.exit = krb5enc_exit_tfm; + + inst->alg.setkey = krb5enc_setkey; + inst->alg.encrypt = krb5enc_encrypt; + inst->alg.decrypt = krb5enc_decrypt; + + inst->free = krb5enc_free; + + err = aead_register_instance(tmpl, inst); + if (err) { + pr_err("ref failed\n"); + goto err_free_inst; + } + + return 0; + +err_free_inst: + krb5enc_free(inst); + return err; +} + +static struct crypto_template crypto_krb5enc_tmpl = { + .name = "krb5enc", + .create = krb5enc_create, + .module = THIS_MODULE, +}; + +static int __init crypto_krb5enc_module_init(void) +{ + return crypto_register_template(&crypto_krb5enc_tmpl); +} + +static void __exit crypto_krb5enc_module_exit(void) +{ + crypto_unregister_template(&crypto_krb5enc_tmpl); +} + +subsys_initcall(crypto_krb5enc_module_init); +module_exit(crypto_krb5enc_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Simple AEAD wrapper for Kerberos 5 RFC3961"); +MODULE_ALIAS_CRYPTO("krb5enc"); diff --git a/crypto/testmgr.c b/crypto/testmgr.c index 0fd6d0b3bf083..fb21f2d190854 100644 --- a/crypto/testmgr.c +++ b/crypto/testmgr.c @@ -4371,6 +4371,12 @@ static const struct alg_test_desc alg_test_descs[] = { .alg = "authenc(hmac(sha256),ctr(aes))", .test = alg_test_null, .fips_allowed = 1, + }, { + .alg = "authenc(hmac(sha256),cts(cbc(aes)))", + .test = alg_test_aead, + .suite = { + .aead = __VECS(krb5_test_aes128_cts_hmac_sha256_128) + } }, { .alg = "authenc(hmac(sha256),rfc3686(ctr(aes)))", .test = alg_test_null, @@ -4391,6 +4397,12 @@ static const struct alg_test_desc alg_test_descs[] = { .alg = "authenc(hmac(sha384),ctr(aes))", .test = alg_test_null, .fips_allowed = 1, + }, { + .alg = "authenc(hmac(sha384),cts(cbc(aes)))", + .test = alg_test_aead, + .suite = { + .aead = __VECS(krb5_test_aes256_cts_hmac_sha384_192) + } }, { .alg = "authenc(hmac(sha384),rfc3686(ctr(aes)))", .test = alg_test_null, @@ -5235,6 +5247,10 @@ static const struct alg_test_desc alg_test_descs[] = { .alg = "jitterentropy_rng", .fips_allowed = 1, .test = alg_test_null, + }, { + .alg = "krb5enc(cmac(camellia),cts(cbc(camellia)))", + .test = alg_test_aead, + .suite.aead = __VECS(krb5_test_camellia_cts_cmac) }, { .alg = "kw(aes)", .test = alg_test_skcipher, diff --git a/crypto/testmgr.h b/crypto/testmgr.h index 2f25febf45af6..4dfe70cdea529 100644 --- a/crypto/testmgr.h +++ b/crypto/testmgr.h @@ -34103,4 +34103,355 @@ static const struct hash_testvec blakes2s_256_tv_template[] = {{ 0xd5, 0x06, 0xb5, 0x3a, 0x7c, 0x7a, 0x65, 0x1d, }, }}; +#ifdef __LITTLE_ENDIAN +#define AUTHENC_KEY_HEADER(enckeylen) \ + "\x08\x00\x01\x00" /* LE rtattr */ \ + enckeylen /* crypto_authenc_key_param */ +#else +#define AUTHENC_KEY_HEADER(enckeylen) \ + "\x00\x08\x00\x01" /* BE rtattr */ \ + enckeylen /* crypto_authenc_key_param */ +#endif + +static const struct aead_testvec krb5_test_aes128_cts_hmac_sha256_128[] = { + /* rfc8009 Appendix A */ + { + /* "enc no plain" */ + .key = + AUTHENC_KEY_HEADER("\x00\x00\x00\x10") + "\x9F\xDA\x0E\x56\xAB\x2D\x85\xE1\x56\x9A\x68\x86\x96\xC2\x6A\x6C" // Ki + "\x9B\x19\x7D\xD1\xE8\xC5\x60\x9D\x6E\x67\xC3\xE3\x7C\x62\xC7\x2E", // Ke + .klen = 4 + 4 + 16 + 16, + .ptext = + "\x7E\x58\x95\xEA\xF2\x67\x24\x35\xBA\xD8\x17\xF5\x45\xA3\x71\x48" // Confounder + "", // Plain + .plen = 16 + 0, + .ctext = + "\xEF\x85\xFB\x89\x0B\xB8\x47\x2F\x4D\xAB\x20\x39\x4D\xCA\x78\x1D" + "\xAD\x87\x7E\xDA\x39\xD5\x0C\x87\x0C\x0D\x5A\x0A\x8E\x48\xC7\x18", + .clen = 16 + 0 + 16, + .assoc = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", // IV + .alen = 16, + }, { + /* "enc plainblock" */ + .key = + AUTHENC_KEY_HEADER("\x00\x00\x00\x10") + "\x9F\xDA\x0E\x56\xAB\x2D\x85\xE1\x56\x9A\x68\x86\x96\xC2\x6A\x6C" // Ki + "\x9B\x19\x7D\xD1\xE8\xC5\x60\x9D\x6E\x67\xC3\xE3\x7C\x62\xC7\x2E", // Ke + .klen = 4 + 4 + 16 + 16, + .ptext = + "\xA7\xA4\xE2\x9A\x47\x28\xCE\x10\x66\x4F\xB6\x4E\x49\xAD\x3F\xAC" // Confounder + "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0A\x0B\x0C\x0D\x0E\x0F" + "\x10\x11\x12\x13\x14", // Plain + .plen = 16 + 21, + .ctext = + "\x72\x0F\x73\xB1\x8D\x98\x59\xCD\x6C\xCB\x43\x46\x11\x5C\xD3\x36" + "\xC7\x0F\x58\xED\xC0\xC4\x43\x7C\x55\x73\x54\x4C\x31\xC8\x13\xBC" + "\xE1\xE6\xD0\x72\xC1\x86\xB3\x9A\x41\x3C\x2F\x92\xCA\x9B\x83\x34" + "\xA2\x87\xFF\xCB\xFC", + .clen = 16 + 21 + 16, + .assoc = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", // IV + .alen = 16, + }, +}; + +static const struct aead_testvec krb5_test_aes256_cts_hmac_sha384_192[] = { + /* rfc8009 Appendix A */ + { + /* "enc no plain" */ + .key = + AUTHENC_KEY_HEADER("\x00\x00\x00\x20") + "\x69\xB1\x65\x14\xE3\xCD\x8E\x56\xB8\x20\x10\xD5\xC7\x30\x12\xB6" + "\x22\xC4\xD0\x0F\xFC\x23\xED\x1F" // Ki + "\x56\xAB\x22\xBE\xE6\x3D\x82\xD7\xBC\x52\x27\xF6\x77\x3F\x8E\xA7" + "\xA5\xEB\x1C\x82\x51\x60\xC3\x83\x12\x98\x0C\x44\x2E\x5C\x7E\x49", // Ke + .klen = 4 + 4 + 32 + 24, + .ptext = + "\xF7\x64\xE9\xFA\x15\xC2\x76\x47\x8B\x2C\x7D\x0C\x4E\x5F\x58\xE4" // Confounder + "", // Plain + .plen = 16 + 0, + .ctext = + "\x41\xF5\x3F\xA5\xBF\xE7\x02\x6D\x91\xFA\xF9\xBE\x95\x91\x95\xA0" + "\x58\x70\x72\x73\xA9\x6A\x40\xF0\xA0\x19\x60\x62\x1A\xC6\x12\x74" + "\x8B\x9B\xBF\xBE\x7E\xB4\xCE\x3C", + .clen = 16 + 0 + 24, + .assoc = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", // IV + .alen = 16, + }, { + /* "enc plainblock" */ + .key = + AUTHENC_KEY_HEADER("\x00\x00\x00\x20") + "\x69\xB1\x65\x14\xE3\xCD\x8E\x56\xB8\x20\x10\xD5\xC7\x30\x12\xB6" + "\x22\xC4\xD0\x0F\xFC\x23\xED\x1F" // Ki + "\x56\xAB\x22\xBE\xE6\x3D\x82\xD7\xBC\x52\x27\xF6\x77\x3F\x8E\xA7" + "\xA5\xEB\x1C\x82\x51\x60\xC3\x83\x12\x98\x0C\x44\x2E\x5C\x7E\x49", // Ke + .klen = 4 + 4 + 32 + 24, + .ptext = + "\x76\x3E\x65\x36\x7E\x86\x4F\x02\xF5\x51\x53\xC7\xE3\xB5\x8A\xF1" // Confounder + "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0A\x0B\x0C\x0D\x0E\x0F" + "\x10\x11\x12\x13\x14", // Plain + .plen = 16 + 21, + .ctext = + "\x40\x01\x3E\x2D\xF5\x8E\x87\x51\x95\x7D\x28\x78\xBC\xD2\xD6\xFE" + "\x10\x1C\xCF\xD5\x56\xCB\x1E\xAE\x79\xDB\x3C\x3E\xE8\x64\x29\xF2" + "\xB2\xA6\x02\xAC\x86\xFE\xF6\xEC\xB6\x47\xD6\x29\x5F\xAE\x07\x7A" + "\x1F\xEB\x51\x75\x08\xD2\xC1\x6B\x41\x92\xE0\x1F\x62", + .clen = 16 + 21 + 24, + .assoc = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", // IV + .alen = 16, + }, +}; + +static const struct aead_testvec krb5_test_camellia_cts_cmac[] = { + /* rfc6803 sec 10 */ + { + // "enc no plain" + .key = + AUTHENC_KEY_HEADER("\x00\x00\x00\x10") + "\x45\xeb\x66\xe2\xef\xa8\x77\x8f\x7d\xf1\x46\x54\x53\x05\x98\x06" // Ki + "\xe9\x9b\x82\xb3\x6c\x4a\xe8\xea\x19\xe9\x5d\xfa\x9e\xde\x88\x2c", // Ke + .klen = 4 + 4 + 16 * 2, + .ptext = + "\xB6\x98\x22\xA1\x9A\x6B\x09\xC0\xEB\xC8\x55\x7D\x1F\x1B\x6C\x0A" // Confounder + "", // Plain + .plen = 16 + 0, + .ctext = + "\xC4\x66\xF1\x87\x10\x69\x92\x1E\xDB\x7C\x6F\xDE\x24\x4A\x52\xDB" + "\x0B\xA1\x0E\xDC\x19\x7B\xDB\x80\x06\x65\x8C\xA3\xCC\xCE\x6E\xB8", + .clen = 16 + 0 + 16, + }, { + // "enc 1 plain", + .key = + AUTHENC_KEY_HEADER("\x00\x00\x00\x10") + "\x13\x5f\xe7\x11\x6f\x53\xc2\xaa\x36\x12\xb7\xea\xe0\xf2\x84\xaa" // Ki + "\xa7\xed\xcd\x53\x97\xea\x6d\x12\xb0\xaf\xf4\xcb\x8d\xaa\x57\xad", // Ke + .klen = 4 + 4 + 16 * 2, + .ptext = + "\x6F\x2F\xC3\xC2\xA1\x66\xFD\x88\x98\x96\x7A\x83\xDE\x95\x96\xD9" // Confounder + "1", // Plain + .plen = 16 + 1, + .ctext = + "\x84\x2D\x21\xFD\x95\x03\x11\xC0\xDD\x46\x4A\x3F\x4B\xE8\xD6\xDA" + "\x88\xA5\x6D\x55\x9C\x9B\x47\xD3\xF9\xA8\x50\x67\xAF\x66\x15\x59" + "\xB8", + .clen = 16 + 1 + 16, + }, { + // "enc 9 plain", + .key = + AUTHENC_KEY_HEADER("\x00\x00\x00\x10") + "\x10\x2c\x34\xd0\x75\x74\x9f\x77\x8a\x15\xca\xd1\xe9\x7d\xa9\x86" // Ki + "\xdd\xe4\x2e\xca\x7c\xd9\x86\x3f\xc3\xce\x89\xcb\xc9\x43\x62\xd7", // Ke + .klen = 4 + 4 + 16 * 2, + .ptext = + "\xA5\xB4\xA7\x1E\x07\x7A\xEE\xF9\x3C\x87\x63\xC1\x8F\xDB\x1F\x10" // Confounder + "9 bytesss", // Plain + .plen = 16 + 9, + .ctext = + "\x61\x9F\xF0\x72\xE3\x62\x86\xFF\x0A\x28\xDE\xB3\xA3\x52\xEC\x0D" + "\x0E\xDF\x5C\x51\x60\xD6\x63\xC9\x01\x75\x8C\xCF\x9D\x1E\xD3\x3D" + "\x71\xDB\x8F\x23\xAA\xBF\x83\x48\xA0", + .clen = 16 + 9 + 16, + }, { + // "enc 13 plain", + .key = + AUTHENC_KEY_HEADER("\x00\x00\x00\x10") + "\xb8\xc4\x38\xcc\x1a\x00\x60\xfc\x91\x3a\x8e\x07\x16\x96\xbd\x08" // Ki + "\xc3\x11\x3a\x25\x85\x90\xb9\xae\xbf\x72\x1b\x1a\xf6\xb0\xcb\xf8", // Ke + .klen = 4 + 4 + 16 * 2, + .ptext = + "\x19\xFE\xE4\x0D\x81\x0C\x52\x4B\x5B\x22\xF0\x18\x74\xC6\x93\xDA" // Confounder + "13 bytes byte", // Plain + .plen = 16 + 13, + .ctext = + "\xB8\xEC\xA3\x16\x7A\xE6\x31\x55\x12\xE5\x9F\x98\xA7\xC5\x00\x20" + "\x5E\x5F\x63\xFF\x3B\xB3\x89\xAF\x1C\x41\xA2\x1D\x64\x0D\x86\x15" + "\xC9\xED\x3F\xBE\xB0\x5A\xB6\xAC\xB6\x76\x89\xB5\xEA", + .clen = 16 + 13 + 16, + }, { + // "enc 30 plain", + .key = + AUTHENC_KEY_HEADER("\x00\x00\x00\x10") + "\x18\xaf\x19\xb0\x23\x74\x44\xfd\x75\x04\xad\x7d\xbd\x48\xad\xd3" // Ki + "\x8b\x07\xee\xd3\x01\x49\x91\x6a\xa2\x0d\xb3\xf5\xce\xd8\xaf\xad", // Ke + .klen = 4 + 4 + 16 * 2, + .ptext = + "\xCA\x7A\x7A\xB4\xBE\x19\x2D\xAB\xD6\x03\x50\x6D\xB1\x9C\x39\xE2" // Confounder + "30 bytes bytes bytes bytes byt", // Plain + .plen = 16 + 30, + .ctext = + "\xA2\x6A\x39\x05\xA4\xFF\xD5\x81\x6B\x7B\x1E\x27\x38\x0D\x08\x09" + "\x0C\x8E\xC1\xF3\x04\x49\x6E\x1A\xBD\xCD\x2B\xDC\xD1\xDF\xFC\x66" + "\x09\x89\xE1\x17\xA7\x13\xDD\xBB\x57\xA4\x14\x6C\x15\x87\xCB\xA4" + "\x35\x66\x65\x59\x1D\x22\x40\x28\x2F\x58\x42\xB1\x05\xA5", + .clen = 16 + 30 + 16, + }, { + // "enc no plain", + .key = + AUTHENC_KEY_HEADER("\x00\x00\x00\x20") + "\xa2\xb8\x33\xe9\x43\xbb\x10\xee\x53\xb4\xa1\x9b\xc2\xbb\xc7\xe1" + "\x9b\x87\xad\x5d\xe9\x21\x22\xa4\x33\x8b\xe6\xf7\x32\xfd\x8a\x0e" // Ki + "\x6c\xcb\x3f\x25\xd8\xae\x57\xf4\xe8\xf6\xca\x47\x4b\xdd\xef\xf1" + "\x16\xce\x13\x1b\x3f\x71\x01\x2e\x75\x6d\x6b\x1e\x3f\x70\xa7\xf1", // Ke + .klen = 4 + 4 + 32 * 2, + .ptext = + "\x3C\xBB\xD2\xB4\x59\x17\x94\x10\x67\xF9\x65\x99\xBB\x98\x92\x6C" // Confounder + "", // Plain + .plen = 16 + 0, + .ctext = + "\x03\x88\x6D\x03\x31\x0B\x47\xA6\xD8\xF0\x6D\x7B\x94\xD1\xDD\x83" + "\x7E\xCC\xE3\x15\xEF\x65\x2A\xFF\x62\x08\x59\xD9\x4A\x25\x92\x66", + .clen = 16 + 0 + 16, + }, { + // "enc 1 plain", + .key = + AUTHENC_KEY_HEADER("\x00\x00\x00\x20") + "\x84\x61\x4b\xfa\x98\xf1\x74\x8a\xa4\xaf\x99\x2b\x8c\x26\x28\x0d" + "\xc8\x98\x73\x29\xdf\x77\x5c\x1d\xb0\x4a\x43\xf1\x21\xaa\x86\x65" // Ki + "\xe9\x31\x73\xaa\x01\xeb\x3c\x24\x62\x31\xda\xfc\x78\x02\xee\x32" + "\xaf\x24\x85\x1d\x8c\x73\x87\xd1\x8c\xb9\xb2\xc5\xb7\xf5\x70\xb8", // Ke + .klen = 4 + 4 + 32 * 2, + .ptext = + "\xDE\xF4\x87\xFC\xEB\xE6\xDE\x63\x46\xD4\xDA\x45\x21\xBB\xA2\xD2" // Confounder + "1", // Plain + .plen = 16 + 1, + .ctext = + "\x2C\x9C\x15\x70\x13\x3C\x99\xBF\x6A\x34\xBC\x1B\x02\x12\x00\x2F" + "\xD1\x94\x33\x87\x49\xDB\x41\x35\x49\x7A\x34\x7C\xFC\xD9\xD1\x8A" + "\x12", + .clen = 16 + 1 + 16, + }, { + // "enc 9 plain", + .key = + AUTHENC_KEY_HEADER("\x00\x00\x00\x20") + "\x47\xb9\xf5\xba\xd7\x63\x00\x58\x2a\x54\x45\xfa\x0c\x1b\x29\xc3" + "\xaa\x83\xec\x63\xb9\x0b\x4a\xb0\x08\x48\xc1\x85\x67\x4f\x44\xa7" // Ki + "\xcd\xa2\xd3\x9a\x9b\x24\x3f\xfe\xb5\x6e\x8d\x5f\x4b\xd5\x28\x74" + "\x1e\xcb\x52\x0c\x62\x12\x3f\xb0\x40\xb8\x41\x8b\x15\xc7\xd7\x0c", // Ke + .klen = 4 + 4 + 32 * 2, + .ptext = + "\xAD\x4F\xF9\x04\xD3\x4E\x55\x53\x84\xB1\x41\x00\xFC\x46\x5F\x88" // Confounder + "9 bytesss", // Plain + .plen = 16 + 9, + .ctext = + "\x9C\x6D\xE7\x5F\x81\x2D\xE7\xED\x0D\x28\xB2\x96\x35\x57\xA1\x15" + "\x64\x09\x98\x27\x5B\x0A\xF5\x15\x27\x09\x91\x3F\xF5\x2A\x2A\x9C" + "\x8E\x63\xB8\x72\xF9\x2E\x64\xC8\x39", + .clen = 16 + 9 + 16, + }, { + // "enc 13 plain", + .key = + AUTHENC_KEY_HEADER("\x00\x00\x00\x20") + "\x15\x2f\x8c\x9d\xc9\x85\x79\x6e\xb1\x94\xed\x14\xc5\x9e\xac\xdd" + "\x41\x8a\x33\x32\x36\xb7\x8f\xaf\xa7\xc7\x9b\x04\xe0\xac\xe7\xbf" // Ki + "\xcd\x8a\x10\xe2\x79\xda\xdd\xb6\x90\x1e\xc3\x0b\xdf\x98\x73\x25" + "\x0f\x6e\xfc\x6a\x77\x36\x7d\x74\xdc\x3e\xe7\xf7\x4b\xc7\x77\x4e", // Ke + .klen = 4 + 4 + 32 * 2, + .ptext = + "\xCF\x9B\xCA\x6D\xF1\x14\x4E\x0C\x0A\xF9\xB8\xF3\x4C\x90\xD5\x14" // Confounder + "13 bytes byte", + .plen = 16 + 13, + .ctext = + "\xEE\xEC\x85\xA9\x81\x3C\xDC\x53\x67\x72\xAB\x9B\x42\xDE\xFC\x57" + "\x06\xF7\x26\xE9\x75\xDD\xE0\x5A\x87\xEB\x54\x06\xEA\x32\x4C\xA1" + "\x85\xC9\x98\x6B\x42\xAA\xBE\x79\x4B\x84\x82\x1B\xEE", + .clen = 16 + 13 + 16, + }, { + // "enc 30 plain", + .key = + AUTHENC_KEY_HEADER("\x00\x00\x00\x20") + "\x04\x8d\xeb\xf7\xb1\x2c\x09\x32\xe8\xb2\x96\x99\x6c\x23\xf8\xb7" + "\x9d\x59\xb9\x7e\xa1\x19\xfc\x0c\x15\x6b\xf7\x88\xdc\x8c\x85\xe8" // Ki + "\x1d\x51\x47\xf3\x4b\xb0\x01\xa0\x4a\x68\xa7\x13\x46\xe7\x65\x4e" + "\x02\x23\xa6\x0d\x90\xbc\x2b\x79\xb4\xd8\x79\x56\xd4\x7c\xd4\x2a", // Ke + .klen = 4 + 4 + 32 * 2, + .ptext = + "\x64\x4D\xEF\x38\xDA\x35\x00\x72\x75\x87\x8D\x21\x68\x55\xE2\x28" // Confounder + "30 bytes bytes bytes bytes byt", // Plain + .plen = 16 + 30, + .ctext = + "\x0E\x44\x68\x09\x85\x85\x5F\x2D\x1F\x18\x12\x52\x9C\xA8\x3B\xFD" + "\x8E\x34\x9D\xE6\xFD\x9A\xDA\x0B\xAA\xA0\x48\xD6\x8E\x26\x5F\xEB" + "\xF3\x4A\xD1\x25\x5A\x34\x49\x99\xAD\x37\x14\x68\x87\xA6\xC6\x84" + "\x57\x31\xAC\x7F\x46\x37\x6A\x05\x04\xCD\x06\x57\x14\x74", + .clen = 16 + 30 + 16, + }, +}; + #endif /* _CRYPTO_TESTMGR_H */ diff --git a/include/crypto/authenc.h b/include/crypto/authenc.h index 5f92a986083c6..15a9caa2354a1 100644 --- a/include/crypto/authenc.h +++ b/include/crypto/authenc.h @@ -28,5 +28,7 @@ struct crypto_authenc_keys { int crypto_authenc_extractkeys(struct crypto_authenc_keys *keys, const u8 *key, unsigned int keylen); +int crypto_krb5enc_extractkeys(struct crypto_authenc_keys *keys, const u8 *key, + unsigned int keylen); #endif /* _CRYPTO_AUTHENC_H */ diff --git a/include/crypto/krb5.h b/include/crypto/krb5.h new file mode 100644 index 0000000000000..62d998e62f47d --- /dev/null +++ b/include/crypto/krb5.h @@ -0,0 +1,160 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* Kerberos 5 crypto + * + * Copyright (C) 2025 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#ifndef _CRYPTO_KRB5_H +#define _CRYPTO_KRB5_H + +#include +#include +#include + +struct crypto_shash; +struct scatterlist; + +/* + * Per Kerberos v5 protocol spec crypto types from the wire. These get mapped + * to linux kernel crypto routines. + */ +#define KRB5_ENCTYPE_NULL 0x0000 +#define KRB5_ENCTYPE_DES_CBC_CRC 0x0001 /* DES cbc mode with CRC-32 */ +#define KRB5_ENCTYPE_DES_CBC_MD4 0x0002 /* DES cbc mode with RSA-MD4 */ +#define KRB5_ENCTYPE_DES_CBC_MD5 0x0003 /* DES cbc mode with RSA-MD5 */ +#define KRB5_ENCTYPE_DES_CBC_RAW 0x0004 /* DES cbc mode raw */ +/* XXX deprecated? */ +#define KRB5_ENCTYPE_DES3_CBC_SHA 0x0005 /* DES-3 cbc mode with NIST-SHA */ +#define KRB5_ENCTYPE_DES3_CBC_RAW 0x0006 /* DES-3 cbc mode raw */ +#define KRB5_ENCTYPE_DES_HMAC_SHA1 0x0008 +#define KRB5_ENCTYPE_DES3_CBC_SHA1 0x0010 +#define KRB5_ENCTYPE_AES128_CTS_HMAC_SHA1_96 0x0011 +#define KRB5_ENCTYPE_AES256_CTS_HMAC_SHA1_96 0x0012 +#define KRB5_ENCTYPE_AES128_CTS_HMAC_SHA256_128 0x0013 +#define KRB5_ENCTYPE_AES256_CTS_HMAC_SHA384_192 0x0014 +#define KRB5_ENCTYPE_ARCFOUR_HMAC 0x0017 +#define KRB5_ENCTYPE_ARCFOUR_HMAC_EXP 0x0018 +#define KRB5_ENCTYPE_CAMELLIA128_CTS_CMAC 0x0019 +#define KRB5_ENCTYPE_CAMELLIA256_CTS_CMAC 0x001a +#define KRB5_ENCTYPE_UNKNOWN 0x01ff + +#define KRB5_CKSUMTYPE_CRC32 0x0001 +#define KRB5_CKSUMTYPE_RSA_MD4 0x0002 +#define KRB5_CKSUMTYPE_RSA_MD4_DES 0x0003 +#define KRB5_CKSUMTYPE_DESCBC 0x0004 +#define KRB5_CKSUMTYPE_RSA_MD5 0x0007 +#define KRB5_CKSUMTYPE_RSA_MD5_DES 0x0008 +#define KRB5_CKSUMTYPE_NIST_SHA 0x0009 +#define KRB5_CKSUMTYPE_HMAC_SHA1_DES3 0x000c +#define KRB5_CKSUMTYPE_HMAC_SHA1_96_AES128 0x000f +#define KRB5_CKSUMTYPE_HMAC_SHA1_96_AES256 0x0010 +#define KRB5_CKSUMTYPE_CMAC_CAMELLIA128 0x0011 +#define KRB5_CKSUMTYPE_CMAC_CAMELLIA256 0x0012 +#define KRB5_CKSUMTYPE_HMAC_SHA256_128_AES128 0x0013 +#define KRB5_CKSUMTYPE_HMAC_SHA384_192_AES256 0x0014 +#define KRB5_CKSUMTYPE_HMAC_MD5_ARCFOUR -138 /* Microsoft md5 hmac cksumtype */ + +/* + * Constants used for key derivation + */ +/* from rfc3961 */ +#define KEY_USAGE_SEED_CHECKSUM (0x99) +#define KEY_USAGE_SEED_ENCRYPTION (0xAA) +#define KEY_USAGE_SEED_INTEGRITY (0x55) + +/* + * Mode of operation. + */ +enum krb5_crypto_mode { + KRB5_CHECKSUM_MODE, /* Checksum only */ + KRB5_ENCRYPT_MODE, /* Fully encrypted, possibly with integrity checksum */ +}; + +struct krb5_buffer { + unsigned int len; + void *data; +}; + +/* + * Kerberos encoding type definition. + */ +struct krb5_enctype { + int etype; /* Encryption (key) type */ + int ctype; /* Checksum type */ + const char *name; /* "Friendly" name */ + const char *encrypt_name; /* Crypto encrypt+checksum name */ + const char *cksum_name; /* Crypto checksum name */ + const char *hash_name; /* Crypto hash name */ + const char *derivation_enc; /* Cipher used in key derivation */ + u16 block_len; /* Length of encryption block */ + u16 conf_len; /* Length of confounder (normally == block_len) */ + u16 cksum_len; /* Length of checksum */ + u16 key_bytes; /* Length of raw key, in bytes */ + u16 key_len; /* Length of final key, in bytes */ + u16 hash_len; /* Length of hash in bytes */ + u16 prf_len; /* Length of PRF() result in bytes */ + u16 Kc_len; /* Length of Kc in bytes */ + u16 Ke_len; /* Length of Ke in bytes */ + u16 Ki_len; /* Length of Ki in bytes */ + bool keyed_cksum; /* T if a keyed cksum */ + + const struct krb5_crypto_profile *profile; + + int (*random_to_key)(const struct krb5_enctype *krb5, + const struct krb5_buffer *in, + struct krb5_buffer *out); /* complete key generation */ +}; + +/* + * krb5_api.c + */ +const struct krb5_enctype *crypto_krb5_find_enctype(u32 enctype); +size_t crypto_krb5_how_much_buffer(const struct krb5_enctype *krb5, + enum krb5_crypto_mode mode, + size_t data_size, size_t *_offset); +size_t crypto_krb5_how_much_data(const struct krb5_enctype *krb5, + enum krb5_crypto_mode mode, + size_t *_buffer_size, size_t *_offset); +void crypto_krb5_where_is_the_data(const struct krb5_enctype *krb5, + enum krb5_crypto_mode mode, + size_t *_offset, size_t *_len); +struct crypto_aead *crypto_krb5_prepare_encryption(const struct krb5_enctype *krb5, + const struct krb5_buffer *TK, + u32 usage, gfp_t gfp); +struct crypto_shash *crypto_krb5_prepare_checksum(const struct krb5_enctype *krb5, + const struct krb5_buffer *TK, + u32 usage, gfp_t gfp); +ssize_t crypto_krb5_encrypt(const struct krb5_enctype *krb5, + struct crypto_aead *aead, + struct scatterlist *sg, unsigned int nr_sg, + size_t sg_len, + size_t data_offset, size_t data_len, + bool preconfounded); +int crypto_krb5_decrypt(const struct krb5_enctype *krb5, + struct crypto_aead *aead, + struct scatterlist *sg, unsigned int nr_sg, + size_t *_offset, size_t *_len); +ssize_t crypto_krb5_get_mic(const struct krb5_enctype *krb5, + struct crypto_shash *shash, + const struct krb5_buffer *metadata, + struct scatterlist *sg, unsigned int nr_sg, + size_t sg_len, + size_t data_offset, size_t data_len); +int crypto_krb5_verify_mic(const struct krb5_enctype *krb5, + struct crypto_shash *shash, + const struct krb5_buffer *metadata, + struct scatterlist *sg, unsigned int nr_sg, + size_t *_offset, size_t *_len); + +/* + * krb5_kdf.c + */ +int crypto_krb5_calc_PRFplus(const struct krb5_enctype *krb5, + const struct krb5_buffer *K, + unsigned int L, + const struct krb5_buffer *S, + struct krb5_buffer *result, + gfp_t gfp); + +#endif /* _CRYPTO_KRB5_H */ diff --git a/include/linux/ceph/ceph_fs.h b/include/linux/ceph/ceph_fs.h index 45f8ce61e1034..a0df88248ac2b 100644 --- a/include/linux/ceph/ceph_fs.h +++ b/include/linux/ceph/ceph_fs.h @@ -83,8 +83,9 @@ struct ceph_dir_layout { } __attribute__ ((packed)); /* crypto algorithms */ -#define CEPH_CRYPTO_NONE 0x0 -#define CEPH_CRYPTO_AES 0x1 +#define CEPH_CRYPTO_NONE 0x0 +#define CEPH_CRYPTO_AES 0x1 +#define CEPH_CRYPTO_AES256KRB5 0x2 /* AES256-CTS-HMAC384-192 */ #define CEPH_AES_IV "cephsageyudagreg" diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h index e61d164622db4..f00c60f4f3b90 100644 --- a/include/linux/scatterlist.h +++ b/include/linux/scatterlist.h @@ -671,6 +671,7 @@ sg_page_iter_dma_address(struct sg_dma_page_iter *dma_iter) #define SG_MITER_ATOMIC (1 << 0) /* use kmap_atomic */ #define SG_MITER_TO_SG (1 << 1) /* flush back to phys on unmap */ #define SG_MITER_FROM_SG (1 << 2) /* nop */ +#define SG_MITER_LOCAL (1 << 3) /* use kmap_local */ struct sg_mapping_iter { /* the following three fields can be accessed directly */ diff --git a/lib/scatterlist.c b/lib/scatterlist.c index 419db10190dd0..503fbf641f1ec 100644 --- a/lib/scatterlist.c +++ b/lib/scatterlist.c @@ -874,7 +874,7 @@ EXPORT_SYMBOL(sg_miter_skip); * @miter->addr and @miter->length point to the current mapping. * * Context: - * May sleep if !SG_MITER_ATOMIC. + * May sleep if !SG_MITER_ATOMIC && !SG_MITER_LOCAL. * * Returns: * true if @miter contains the next mapping. false if end of sg @@ -896,6 +896,8 @@ bool sg_miter_next(struct sg_mapping_iter *miter) if (miter->__flags & SG_MITER_ATOMIC) miter->addr = kmap_atomic(miter->page) + miter->__offset; + else if (miter->__flags & SG_MITER_LOCAL) + miter->addr = kmap_local_page(miter->page) + miter->__offset; else miter->addr = kmap(miter->page) + miter->__offset; @@ -931,7 +933,9 @@ void sg_miter_stop(struct sg_mapping_iter *miter) if (miter->__flags & SG_MITER_ATOMIC) { WARN_ON_ONCE(!pagefault_disabled()); kunmap_atomic(miter->addr); - } else + } else if (miter->__flags & SG_MITER_LOCAL) + kunmap_local(miter->addr); + else kunmap(miter->page); miter->page = NULL; @@ -960,7 +964,7 @@ size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents, void *buf, { unsigned int offset = 0; struct sg_mapping_iter miter; - unsigned int sg_flags = SG_MITER_ATOMIC; + unsigned int sg_flags = SG_MITER_LOCAL; if (to_buffer) sg_flags |= SG_MITER_FROM_SG; @@ -1075,7 +1079,7 @@ size_t sg_zero_buffer(struct scatterlist *sgl, unsigned int nents, { unsigned int offset = 0; struct sg_mapping_iter miter; - unsigned int sg_flags = SG_MITER_ATOMIC | SG_MITER_TO_SG; + unsigned int sg_flags = SG_MITER_LOCAL | SG_MITER_TO_SG; sg_miter_start(&miter, sgl, nents, sg_flags); diff --git a/net/ceph/Kconfig b/net/ceph/Kconfig index c5c4eef3a9ff1..83b2d6f211016 100644 --- a/net/ceph/Kconfig +++ b/net/ceph/Kconfig @@ -6,6 +6,7 @@ config CEPH_LIB select CRYPTO_AES select CRYPTO_CBC select CRYPTO_GCM + select CRYPTO_KRB5 select CRYPTO_HMAC select CRYPTO_SHA256 select CRYPTO diff --git a/net/ceph/auth_x.c b/net/ceph/auth_x.c index b71b1635916e1..87075dae10f00 100644 --- a/net/ceph/auth_x.c +++ b/net/ceph/auth_x.c @@ -17,6 +17,22 @@ #include "auth_x.h" #include "auth_x_protocol.h" +static const u32 ticket_key_usages[] = { + CEPHX_KEY_USAGE_TICKET_SESSION_KEY, + CEPHX_KEY_USAGE_TICKET_BLOB, + CEPHX_KEY_USAGE_AUTH_CONNECTION_SECRET +}; + +static const u32 authorizer_key_usages[] = { + CEPHX_KEY_USAGE_AUTHORIZE, + CEPHX_KEY_USAGE_AUTHORIZE_CHALLENGE, + CEPHX_KEY_USAGE_AUTHORIZE_REPLY +}; + +static const u32 client_key_usages[] = { + CEPHX_KEY_USAGE_TICKET_SESSION_KEY +}; + static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed); static int ceph_x_is_authenticated(struct ceph_auth_client *ac) @@ -44,28 +60,41 @@ static int ceph_x_should_authenticate(struct ceph_auth_client *ac) return !!need; } -static int ceph_x_encrypt_offset(void) +static int __ceph_x_encrypt_offset(const struct ceph_crypto_key *key) +{ + return ceph_crypt_data_offset(key) + + sizeof(struct ceph_x_encrypt_header); +} + +static int ceph_x_encrypt_offset(const struct ceph_crypto_key *key) { - return sizeof(u32) + sizeof(struct ceph_x_encrypt_header); + return sizeof(u32) + __ceph_x_encrypt_offset(key); } -static int ceph_x_encrypt_buflen(int ilen) +/* + * AES: ciphertext_len | hdr | data... | padding + * AES256KRB5: ciphertext_len | confounder | hdr | data... | hmac + */ +static int ceph_x_encrypt_buflen(const struct ceph_crypto_key *key, + int data_len) { - return ceph_x_encrypt_offset() + ilen + 16; + int encrypt_len = sizeof(struct ceph_x_encrypt_header) + data_len; + return sizeof(u32) + ceph_crypt_buflen(key, encrypt_len); } -static int ceph_x_encrypt(struct ceph_crypto_key *secret, void *buf, - int buf_len, int plaintext_len) +static int ceph_x_encrypt(const struct ceph_crypto_key *key, int usage_slot, + void *buf, int buf_len, int plaintext_len) { - struct ceph_x_encrypt_header *hdr = buf + sizeof(u32); + struct ceph_x_encrypt_header *hdr; int ciphertext_len; int ret; + hdr = buf + sizeof(u32) + ceph_crypt_data_offset(key); hdr->struct_v = 1; hdr->magic = cpu_to_le64(CEPHX_ENC_MAGIC); - ret = ceph_crypt(secret, true, buf + sizeof(u32), buf_len - sizeof(u32), - plaintext_len + sizeof(struct ceph_x_encrypt_header), + ret = ceph_crypt(key, usage_slot, true, buf + sizeof(u32), + buf_len - sizeof(u32), plaintext_len + sizeof(*hdr), &ciphertext_len); if (ret) return ret; @@ -74,18 +103,19 @@ static int ceph_x_encrypt(struct ceph_crypto_key *secret, void *buf, return sizeof(u32) + ciphertext_len; } -static int __ceph_x_decrypt(struct ceph_crypto_key *secret, void *p, - int ciphertext_len) +static int __ceph_x_decrypt(const struct ceph_crypto_key *key, int usage_slot, + void *p, int ciphertext_len) { - struct ceph_x_encrypt_header *hdr = p; + struct ceph_x_encrypt_header *hdr; int plaintext_len; int ret; - ret = ceph_crypt(secret, false, p, ciphertext_len, ciphertext_len, - &plaintext_len); + ret = ceph_crypt(key, usage_slot, false, p, ciphertext_len, + ciphertext_len, &plaintext_len); if (ret) return ret; + hdr = p + ceph_crypt_data_offset(key); if (le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC) { pr_err("%s bad magic\n", __func__); return -EINVAL; @@ -94,7 +124,8 @@ static int __ceph_x_decrypt(struct ceph_crypto_key *secret, void *p, return plaintext_len - sizeof(*hdr); } -static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end) +static int ceph_x_decrypt(const struct ceph_crypto_key *key, int usage_slot, + void **p, void *end) { int ciphertext_len; int ret; @@ -102,7 +133,7 @@ static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end) ceph_decode_32_safe(p, end, ciphertext_len, e_inval); ceph_decode_need(p, end, ciphertext_len, e_inval); - ret = __ceph_x_decrypt(secret, *p, ciphertext_len); + ret = __ceph_x_decrypt(key, usage_slot, *p, ciphertext_len); if (ret < 0) return ret; @@ -193,8 +224,10 @@ static int process_one_ticket(struct ceph_auth_client *ac, } /* blob for me */ - dp = *p + ceph_x_encrypt_offset(); - ret = ceph_x_decrypt(secret, p, end); + dp = *p + ceph_x_encrypt_offset(secret); + ret = ceph_x_decrypt(secret, + 0 /* CEPHX_KEY_USAGE_TICKET_SESSION_KEY */, + p, end); if (ret < 0) goto out; dout(" decrypted %d bytes\n", ret); @@ -208,6 +241,11 @@ static int process_one_ticket(struct ceph_auth_client *ac, if (ret) goto out; + ret = ceph_crypto_key_prepare(&new_session_key, ticket_key_usages, + ARRAY_SIZE(ticket_key_usages)); + if (ret) + goto out; + ceph_decode_need(&dp, dend, sizeof(struct ceph_timespec), bad); ceph_decode_timespec64(&validity, dp); dp += sizeof(struct ceph_timespec); @@ -220,8 +258,10 @@ static int process_one_ticket(struct ceph_auth_client *ac, ceph_decode_8_safe(p, end, is_enc, bad); if (is_enc) { /* encrypted */ - tp = *p + ceph_x_encrypt_offset(); - ret = ceph_x_decrypt(&th->session_key, p, end); + tp = *p + ceph_x_encrypt_offset(&th->session_key); + ret = ceph_x_decrypt(&th->session_key, + 1 /* CEPHX_KEY_USAGE_TICKET_BLOB */, + p, end); if (ret < 0) goto out; dout(" encrypted ticket, decrypted %d bytes\n", ret); @@ -312,7 +352,7 @@ static int encrypt_authorizer(struct ceph_x_authorizer *au, p = (void *)(msg_a + 1) + le32_to_cpu(msg_a->ticket_blob.blob_len); end = au->buf->vec.iov_base + au->buf->vec.iov_len; - msg_b = p + ceph_x_encrypt_offset(); + msg_b = p + ceph_x_encrypt_offset(&au->session_key); msg_b->struct_v = 2; msg_b->nonce = cpu_to_le64(au->nonce); if (server_challenge) { @@ -324,7 +364,9 @@ static int encrypt_authorizer(struct ceph_x_authorizer *au, msg_b->server_challenge_plus_one = 0; } - ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b)); + ret = ceph_x_encrypt(&au->session_key, + 0 /* CEPHX_KEY_USAGE_AUTHORIZE */, + p, end - p, sizeof(*msg_b)); if (ret < 0) return ret; @@ -367,8 +409,13 @@ static int ceph_x_build_authorizer(struct ceph_auth_client *ac, if (ret) goto out_au; + ret = ceph_crypto_key_prepare(&au->session_key, authorizer_key_usages, + ARRAY_SIZE(authorizer_key_usages)); + if (ret) + goto out_au; + maxlen = sizeof(*msg_a) + ticket_blob_len + - ceph_x_encrypt_buflen(sizeof(*msg_b)); + ceph_x_encrypt_buflen(&au->session_key, sizeof(*msg_b)); dout(" need len %d\n", maxlen); if (au->buf && au->buf->alloc_len < maxlen) { ceph_buffer_put(au->buf); @@ -506,8 +553,7 @@ static int ceph_x_build_request(struct ceph_auth_client *ac, if (need & CEPH_ENTITY_TYPE_AUTH) { struct ceph_x_authenticate *auth = (void *)(head + 1); void *enc_buf = xi->auth_authorizer.enc_buf; - struct ceph_x_challenge_blob *blob = enc_buf + - ceph_x_encrypt_offset(); + struct ceph_x_challenge_blob *blob; u64 *u; p = auth + 1; @@ -517,14 +563,32 @@ static int ceph_x_build_request(struct ceph_auth_client *ac, dout(" get_auth_session_key\n"); head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY); - /* encrypt and hash */ + if (xi->secret.type == CEPH_CRYPTO_AES) { + blob = enc_buf + ceph_x_encrypt_offset(&xi->secret); + } else { + BUILD_BUG_ON(SHA256_DIGEST_SIZE + sizeof(*blob) > + CEPHX_AU_ENC_BUF_LEN); + blob = enc_buf + SHA256_DIGEST_SIZE; + } + get_random_bytes(&auth->client_challenge, sizeof(u64)); blob->client_challenge = auth->client_challenge; blob->server_challenge = cpu_to_le64(xi->server_challenge); - ret = ceph_x_encrypt(&xi->secret, enc_buf, CEPHX_AU_ENC_BUF_LEN, - sizeof(*blob)); - if (ret < 0) - return ret; + + if (xi->secret.type == CEPH_CRYPTO_AES) { + ret = ceph_x_encrypt(&xi->secret, 0 /* dummy */, + enc_buf, CEPHX_AU_ENC_BUF_LEN, + sizeof(*blob)); + if (ret < 0) + return ret; + } else { + ret = ceph_hmac_sha256(&xi->secret, blob, sizeof(*blob), + enc_buf); + if (ret) + return ret; + + ret = SHA256_DIGEST_SIZE; + } auth->struct_v = 3; /* nautilus+ */ auth->key = 0; @@ -633,8 +697,10 @@ static int handle_auth_session_key(struct ceph_auth_client *ac, u64 global_id, ceph_decode_32_safe(p, end, len, e_inval); dout("%s connection secret blob len %d\n", __func__, len); if (len > 0) { - dp = *p + ceph_x_encrypt_offset(); - ret = ceph_x_decrypt(&th->session_key, p, *p + len); + dp = *p + ceph_x_encrypt_offset(&th->session_key); + ret = ceph_x_decrypt(&th->session_key, + 2 /* CEPHX_KEY_USAGE_AUTH_CONNECTION_SECRET */, + p, *p + len); if (ret < 0) return ret; @@ -797,12 +863,14 @@ static int decrypt_authorizer_challenge(struct ceph_crypto_key *secret, int ret; /* no leading len */ - ret = __ceph_x_decrypt(secret, challenge, challenge_len); + ret = __ceph_x_decrypt(secret, + 1 /* CEPHX_KEY_USAGE_AUTHORIZE_CHALLENGE */, + challenge, challenge_len); if (ret < 0) return ret; dout("%s decrypted %d bytes\n", __func__, ret); - dp = challenge + sizeof(struct ceph_x_encrypt_header); + dp = challenge + __ceph_x_encrypt_offset(secret); dend = dp + ret; ceph_decode_skip_8(&dp, dend, e_inval); /* struct_v */ @@ -849,8 +917,9 @@ static int decrypt_authorizer_reply(struct ceph_crypto_key *secret, u8 struct_v; int ret; - dp = *p + ceph_x_encrypt_offset(); - ret = ceph_x_decrypt(secret, p, end); + dp = *p + ceph_x_encrypt_offset(secret); + ret = ceph_x_decrypt(secret, 2 /* CEPHX_KEY_USAGE_AUTHORIZE_REPLY */, + p, end); if (ret < 0) return ret; @@ -972,7 +1041,8 @@ static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg, __le32 front_crc; __le32 middle_crc; __le32 data_crc; - } __packed *sigblock = enc_buf + ceph_x_encrypt_offset(); + } __packed *sigblock = enc_buf + + ceph_x_encrypt_offset(&au->session_key); sigblock->len = cpu_to_le32(4*sizeof(u32)); sigblock->header_crc = msg->hdr.crc; @@ -980,8 +1050,9 @@ static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg, sigblock->middle_crc = msg->footer.middle_crc; sigblock->data_crc = msg->footer.data_crc; - ret = ceph_x_encrypt(&au->session_key, enc_buf, - CEPHX_AU_ENC_BUF_LEN, sizeof(*sigblock)); + ret = ceph_x_encrypt(&au->session_key, 0 /* dummy */, + enc_buf, CEPHX_AU_ENC_BUF_LEN, + sizeof(*sigblock)); if (ret < 0) return ret; @@ -996,11 +1067,19 @@ static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg, __le32 data_crc; __le32 data_len; __le32 seq_lower_word; - } __packed *sigblock = enc_buf; + } __packed *sigblock; struct { __le64 a, b, c, d; } __packed *penc = enc_buf; - int ciphertext_len; + + if (au->session_key.type == CEPH_CRYPTO_AES) { + /* no leading len, no ceph_x_encrypt_header */ + sigblock = enc_buf; + } else { + BUILD_BUG_ON(SHA256_DIGEST_SIZE + sizeof(*sigblock) > + CEPHX_AU_ENC_BUF_LEN); + sigblock = enc_buf + SHA256_DIGEST_SIZE; + } sigblock->header_crc = msg->hdr.crc; sigblock->front_crc = msg->footer.front_crc; @@ -1011,12 +1090,20 @@ static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg, sigblock->data_len = msg->hdr.data_len; sigblock->seq_lower_word = *(__le32 *)&msg->hdr.seq; - /* no leading len, no ceph_x_encrypt_header */ - ret = ceph_crypt(&au->session_key, true, enc_buf, - CEPHX_AU_ENC_BUF_LEN, sizeof(*sigblock), - &ciphertext_len); - if (ret) - return ret; + if (au->session_key.type == CEPH_CRYPTO_AES) { + int ciphertext_len; /* unused */ + + ret = ceph_crypt(&au->session_key, 0 /* dummy */, + true, enc_buf, CEPHX_AU_ENC_BUF_LEN, + sizeof(*sigblock), &ciphertext_len); + if (ret) + return ret; + } else { + ret = ceph_hmac_sha256(&au->session_key, sigblock, + sizeof(*sigblock), enc_buf); + if (ret) + return ret; + } *psig = penc->a ^ penc->b ^ penc->c ^ penc->d; } @@ -1090,21 +1177,27 @@ int ceph_x_init(struct ceph_auth_client *ac) int ret; dout("ceph_x_init %p\n", ac); - ret = -ENOMEM; xi = kzalloc(sizeof(*xi), GFP_NOFS); if (!xi) - goto out; + return -ENOMEM; ret = -EINVAL; if (!ac->key) { pr_err("no secret set (for auth_x protocol)\n"); - goto out_nomem; + goto err_xi; } ret = ceph_crypto_key_clone(&xi->secret, ac->key); if (ret < 0) { pr_err("cannot clone key: %d\n", ret); - goto out_nomem; + goto err_xi; + } + + ret = ceph_crypto_key_prepare(&xi->secret, client_key_usages, + ARRAY_SIZE(client_key_usages)); + if (ret) { + pr_err("cannot prepare key: %d\n", ret); + goto err_secret; } xi->starting = true; @@ -1115,8 +1208,9 @@ int ceph_x_init(struct ceph_auth_client *ac) ac->ops = &ceph_x_ops; return 0; -out_nomem: +err_secret: + ceph_crypto_key_destroy(&xi->secret); +err_xi: kfree(xi); -out: return ret; } diff --git a/net/ceph/auth_x_protocol.h b/net/ceph/auth_x_protocol.h index 9c60feeb1bcb6..d097b3651c99e 100644 --- a/net/ceph/auth_x_protocol.h +++ b/net/ceph/auth_x_protocol.h @@ -6,6 +6,44 @@ #define CEPHX_GET_PRINCIPAL_SESSION_KEY 0x0200 #define CEPHX_GET_ROTATING_KEY 0x0400 +/* Client <-> AuthMonitor */ +/* + * The AUTH session's connection secret: encrypted with the AUTH + * ticket session key + */ +#define CEPHX_KEY_USAGE_AUTH_CONNECTION_SECRET 0x03 +/* + * The ticket's blob for the client ("blob for me", contains the + * session key): encrypted with the client's secret key in case of + * the AUTH ticket and the AUTH ticket session key in case of other + * service tickets + */ +#define CEPHX_KEY_USAGE_TICKET_SESSION_KEY 0x04 +/* + * The ticket's blob for the service (ceph_x_ticket_blob): possibly + * encrypted with the old AUTH ticket session key in case of the AUTH + * ticket and not encrypted in case of other service tickets + */ +#define CEPHX_KEY_USAGE_TICKET_BLOB 0x05 + +/* Client <-> Service */ +/* + * The client's authorization request (ceph_x_authorize_b): + * encrypted with the service ticket session key + */ +#define CEPHX_KEY_USAGE_AUTHORIZE 0x10 +/* + * The service's challenge (ceph_x_authorize_challenge): + * encrypted with the service ticket session key + */ +#define CEPHX_KEY_USAGE_AUTHORIZE_CHALLENGE 0x11 +/* + * The service's final reply (ceph_x_authorize_reply + the service + * session's connection secret): encrypted with the service ticket + * session key + */ +#define CEPHX_KEY_USAGE_AUTHORIZE_REPLY 0x12 + /* common bits */ struct ceph_x_ticket_blob { __u8 struct_v; diff --git a/net/ceph/crypto.c b/net/ceph/crypto.c index 051d22c0e4ad4..0af42319e0ff0 100644 --- a/net/ceph/crypto.c +++ b/net/ceph/crypto.c @@ -7,6 +7,7 @@ #include #include #include +#include #include #include #include @@ -16,89 +17,140 @@ #include #include "crypto.h" -/* - * Set ->key and ->tfm. The rest of the key should be filled in before - * this function is called. - */ -static int set_secret(struct ceph_crypto_key *key, void *buf) +static int set_aes_tfm(struct ceph_crypto_key *key) { unsigned int noio_flag; int ret; - key->key = NULL; - key->tfm = NULL; - - switch (key->type) { - case CEPH_CRYPTO_NONE: - return 0; /* nothing to do */ - case CEPH_CRYPTO_AES: - break; - default: - return -ENOTSUPP; + noio_flag = memalloc_noio_save(); + key->aes_tfm = crypto_alloc_sync_skcipher("cbc(aes)", 0, 0); + memalloc_noio_restore(noio_flag); + if (IS_ERR(key->aes_tfm)) { + ret = PTR_ERR(key->aes_tfm); + key->aes_tfm = NULL; + return ret; } - if (!key->len) + ret = crypto_sync_skcipher_setkey(key->aes_tfm, key->key, key->len); + if (ret) + return ret; + + return 0; +} + +static int set_krb5_tfms(struct ceph_crypto_key *key, const u32 *key_usages, + int key_usage_cnt) +{ + struct krb5_buffer TK = { .len = key->len, .data = key->key }; + unsigned int noio_flag; + int ret = 0; + int i; + + if (WARN_ON_ONCE(key_usage_cnt > ARRAY_SIZE(key->krb5_tfms))) return -EINVAL; - key->key = kmemdup(buf, key->len, GFP_NOIO); - if (!key->key) { - ret = -ENOMEM; - goto fail; + key->krb5_type = crypto_krb5_find_enctype( + KRB5_ENCTYPE_AES256_CTS_HMAC_SHA384_192); + if (!key->krb5_type) + return -ENOPKG; + + /* + * Despite crypto_krb5_prepare_encryption() taking a gfp mask, + * crypto_alloc_aead() inside of it allocates with GFP_KERNEL. + */ + noio_flag = memalloc_noio_save(); + for (i = 0; i < key_usage_cnt; i++) { + key->krb5_tfms[i] = crypto_krb5_prepare_encryption( + key->krb5_type, &TK, key_usages[i], + GFP_NOIO); + if (IS_ERR(key->krb5_tfms[i])) { + ret = PTR_ERR(key->krb5_tfms[i]); + key->krb5_tfms[i] = NULL; + goto out_flag; + } } - /* crypto_alloc_sync_skcipher() allocates with GFP_KERNEL */ +out_flag: + memalloc_noio_restore(noio_flag); + return ret; +} + +static int set_hmac_and_krb5_tfms(struct ceph_crypto_key *key, + const u32 *key_usages, int key_usage_cnt) +{ + unsigned int noio_flag; + int ret; + noio_flag = memalloc_noio_save(); - key->tfm = crypto_alloc_sync_skcipher("cbc(aes)", 0, 0); + key->hmac_tfm = crypto_alloc_shash("hmac(sha256)", 0, 0); memalloc_noio_restore(noio_flag); - if (IS_ERR(key->tfm)) { - ret = PTR_ERR(key->tfm); - key->tfm = NULL; - goto fail; + if (IS_ERR(key->hmac_tfm)) { + ret = PTR_ERR(key->hmac_tfm); + key->hmac_tfm = NULL; + return ret; } - ret = crypto_sync_skcipher_setkey(key->tfm, key->key, key->len); + ret = crypto_shash_setkey(key->hmac_tfm, key->key, key->len); if (ret) - goto fail; + return ret; - return 0; + return set_krb5_tfms(key, key_usages, key_usage_cnt); +} -fail: - ceph_crypto_key_destroy(key); - return ret; +int ceph_crypto_key_prepare(struct ceph_crypto_key *key, + const u32 *key_usages, int key_usage_cnt) +{ + switch (key->type) { + case CEPH_CRYPTO_NONE: + return 0; /* nothing to do */ + case CEPH_CRYPTO_AES: + return set_aes_tfm(key); + case CEPH_CRYPTO_AES256KRB5: + return set_hmac_and_krb5_tfms(key, key_usages, key_usage_cnt); + default: + return -ENOTSUPP; + } } +/* + * @dst should be zeroed before this function is called. + */ int ceph_crypto_key_clone(struct ceph_crypto_key *dst, const struct ceph_crypto_key *src) { - memcpy(dst, src, sizeof(struct ceph_crypto_key)); - return set_secret(dst, src->key); -} + dst->type = src->type; + dst->created = src->created; + dst->len = src->len; + + dst->key = kmemdup(src->key, src->len, GFP_NOIO); + if (!dst->key) + return -ENOMEM; -int ceph_crypto_key_encode(struct ceph_crypto_key *key, void **p, void *end) -{ - if (*p + sizeof(u16) + sizeof(key->created) + - sizeof(u16) + key->len > end) - return -ERANGE; - ceph_encode_16(p, key->type); - ceph_encode_copy(p, &key->created, sizeof(key->created)); - ceph_encode_16(p, key->len); - ceph_encode_copy(p, key->key, key->len); return 0; } +/* + * @key should be zeroed before this function is called. + */ int ceph_crypto_key_decode(struct ceph_crypto_key *key, void **p, void *end) { - int ret; - ceph_decode_need(p, end, 2*sizeof(u16) + sizeof(key->created), bad); key->type = ceph_decode_16(p); ceph_decode_copy(p, &key->created, sizeof(key->created)); key->len = ceph_decode_16(p); ceph_decode_need(p, end, key->len, bad); - ret = set_secret(key, *p); + if (key->len > CEPH_MAX_KEY_LEN) { + pr_err("secret too big %d\n", key->len); + return -EINVAL; + } + + key->key = kmemdup(*p, key->len, GFP_NOIO); + if (!key->key) + return -ENOMEM; + memzero_explicit(*p, key->len); *p += key->len; - return ret; + return 0; bad: dout("failed to decode crypto key\n"); @@ -134,12 +186,29 @@ int ceph_crypto_key_unarmor(struct ceph_crypto_key *key, const char *inkey) void ceph_crypto_key_destroy(struct ceph_crypto_key *key) { - if (key) { - kfree_sensitive(key->key); - key->key = NULL; - if (key->tfm) { - crypto_free_sync_skcipher(key->tfm); - key->tfm = NULL; + int i; + + if (!key) + return; + + kfree_sensitive(key->key); + key->key = NULL; + + if (key->type == CEPH_CRYPTO_AES) { + if (key->aes_tfm) { + crypto_free_sync_skcipher(key->aes_tfm); + key->aes_tfm = NULL; + } + } else if (key->type == CEPH_CRYPTO_AES256KRB5) { + if (key->hmac_tfm) { + crypto_free_shash(key->hmac_tfm); + key->hmac_tfm = NULL; + } + for (i = 0; i < ARRAY_SIZE(key->krb5_tfms); i++) { + if (key->krb5_tfms[i]) { + crypto_free_aead(key->krb5_tfms[i]); + key->krb5_tfms[i] = NULL; + } } } } @@ -219,7 +288,7 @@ static void teardown_sgtable(struct sg_table *sgt) static int ceph_aes_crypt(const struct ceph_crypto_key *key, bool encrypt, void *buf, int buf_len, int in_len, int *pout_len) { - SYNC_SKCIPHER_REQUEST_ON_STACK(req, key->tfm); + SYNC_SKCIPHER_REQUEST_ON_STACK(req, key->aes_tfm); struct sg_table sgt; struct scatterlist prealloc_sg; char iv[AES_BLOCK_SIZE] __aligned(8); @@ -235,7 +304,7 @@ static int ceph_aes_crypt(const struct ceph_crypto_key *key, bool encrypt, return ret; memcpy(iv, aes_iv, AES_BLOCK_SIZE); - skcipher_request_set_sync_tfm(req, key->tfm); + skcipher_request_set_sync_tfm(req, key->aes_tfm); skcipher_request_set_callback(req, 0, NULL, NULL); skcipher_request_set_crypt(req, sgt.sgl, sgt.sgl, crypt_len, iv); @@ -280,7 +349,68 @@ static int ceph_aes_crypt(const struct ceph_crypto_key *key, bool encrypt, return ret; } -int ceph_crypt(const struct ceph_crypto_key *key, bool encrypt, +static int ceph_krb5_encrypt(const struct ceph_crypto_key *key, int usage_slot, + void *buf, int buf_len, int in_len, int *pout_len) +{ + struct sg_table sgt; + struct scatterlist prealloc_sg; + int ret; + + if (WARN_ON_ONCE(usage_slot >= ARRAY_SIZE(key->krb5_tfms))) + return -EINVAL; + + ret = setup_sgtable(&sgt, &prealloc_sg, buf, buf_len); + if (ret) + return ret; + + ret = crypto_krb5_encrypt(key->krb5_type, key->krb5_tfms[usage_slot], + sgt.sgl, sgt.nents, buf_len, AES_BLOCK_SIZE, + in_len, false); + if (ret < 0) { + pr_err("%s encrypt failed: %d\n", __func__, ret); + goto out_sgt; + } + + *pout_len = ret; + ret = 0; + +out_sgt: + teardown_sgtable(&sgt); + return ret; +} + +static int ceph_krb5_decrypt(const struct ceph_crypto_key *key, int usage_slot, + void *buf, int buf_len, int in_len, int *pout_len) +{ + struct sg_table sgt; + struct scatterlist prealloc_sg; + size_t data_off = 0; + size_t data_len = in_len; + int ret; + + if (WARN_ON_ONCE(usage_slot >= ARRAY_SIZE(key->krb5_tfms))) + return -EINVAL; + + ret = setup_sgtable(&sgt, &prealloc_sg, buf, in_len); + if (ret) + return ret; + + ret = crypto_krb5_decrypt(key->krb5_type, key->krb5_tfms[usage_slot], + sgt.sgl, sgt.nents, &data_off, &data_len); + if (ret) { + pr_err("%s decrypt failed: %d\n", __func__, ret); + goto out_sgt; + } + + WARN_ON(data_off != AES_BLOCK_SIZE); + *pout_len = data_len; + +out_sgt: + teardown_sgtable(&sgt); + return ret; +} + +int ceph_crypt(const struct ceph_crypto_key *key, int usage_slot, bool encrypt, void *buf, int buf_len, int in_len, int *pout_len) { switch (key->type) { @@ -290,11 +420,64 @@ int ceph_crypt(const struct ceph_crypto_key *key, bool encrypt, case CEPH_CRYPTO_AES: return ceph_aes_crypt(key, encrypt, buf, buf_len, in_len, pout_len); + case CEPH_CRYPTO_AES256KRB5: + return encrypt ? + ceph_krb5_encrypt(key, usage_slot, buf, buf_len, in_len, + pout_len) : + ceph_krb5_decrypt(key, usage_slot, buf, buf_len, in_len, + pout_len); default: return -ENOTSUPP; } } +int ceph_crypt_data_offset(const struct ceph_crypto_key *key) +{ + switch (key->type) { + case CEPH_CRYPTO_NONE: + case CEPH_CRYPTO_AES: + return 0; + case CEPH_CRYPTO_AES256KRB5: + /* confounder */ + return AES_BLOCK_SIZE; + default: + BUG(); + } +} + +int ceph_crypt_buflen(const struct ceph_crypto_key *key, int data_len) +{ + switch (key->type) { + case CEPH_CRYPTO_NONE: + return data_len; + case CEPH_CRYPTO_AES: + /* PKCS#7 padding at the end */ + return data_len + AES_BLOCK_SIZE - + (data_len & (AES_BLOCK_SIZE - 1)); + case CEPH_CRYPTO_AES256KRB5: + /* confounder at the beginning and 192-bit HMAC at the end */ + return AES_BLOCK_SIZE + data_len + 24; + default: + BUG(); + } +} + +int ceph_hmac_sha256(const struct ceph_crypto_key *key, const void *buf, + int buf_len, u8 hmac[SHA256_DIGEST_SIZE]) +{ + switch (key->type) { + case CEPH_CRYPTO_NONE: + case CEPH_CRYPTO_AES: + memset(hmac, 0, SHA256_DIGEST_SIZE); + return 0; + case CEPH_CRYPTO_AES256KRB5: + return crypto_shash_tfm_digest(key->hmac_tfm, buf, buf_len, + hmac); + default: + BUG(); + } +} + static int ceph_key_preparse(struct key_preparsed_payload *prep) { struct ceph_crypto_key *ckey; @@ -307,7 +490,7 @@ static int ceph_key_preparse(struct key_preparsed_payload *prep) goto err; ret = -ENOMEM; - ckey = kmalloc(sizeof(*ckey), GFP_KERNEL); + ckey = kzalloc(sizeof(*ckey), GFP_KERNEL); if (!ckey) goto err; diff --git a/net/ceph/crypto.h b/net/ceph/crypto.h index 13bd526349fa1..4f14c516ed015 100644 --- a/net/ceph/crypto.h +++ b/net/ceph/crypto.h @@ -2,10 +2,11 @@ #ifndef _FS_CEPH_CRYPTO_H #define _FS_CEPH_CRYPTO_H +#include #include #include -#define CEPH_KEY_LEN 16 +#define CEPH_MAX_KEY_LEN 32 #define CEPH_MAX_CON_SECRET_LEN 64 /* @@ -16,19 +17,32 @@ struct ceph_crypto_key { struct ceph_timespec created; int len; void *key; - struct crypto_sync_skcipher *tfm; + + union { + struct crypto_sync_skcipher *aes_tfm; + struct { + struct crypto_shash *hmac_tfm; + const struct krb5_enctype *krb5_type; + struct crypto_aead *krb5_tfms[3]; + }; + }; }; +int ceph_crypto_key_prepare(struct ceph_crypto_key *key, + const u32 *key_usages, int key_usage_cnt); int ceph_crypto_key_clone(struct ceph_crypto_key *dst, const struct ceph_crypto_key *src); -int ceph_crypto_key_encode(struct ceph_crypto_key *key, void **p, void *end); int ceph_crypto_key_decode(struct ceph_crypto_key *key, void **p, void *end); int ceph_crypto_key_unarmor(struct ceph_crypto_key *key, const char *in); void ceph_crypto_key_destroy(struct ceph_crypto_key *key); /* crypto.c */ -int ceph_crypt(const struct ceph_crypto_key *key, bool encrypt, +int ceph_crypt(const struct ceph_crypto_key *key, int usage_slot, bool encrypt, void *buf, int buf_len, int in_len, int *pout_len); +int ceph_crypt_data_offset(const struct ceph_crypto_key *key); +int ceph_crypt_buflen(const struct ceph_crypto_key *key, int data_len); +int ceph_hmac_sha256(const struct ceph_crypto_key *key, const void *buf, + int buf_len, u8 hmac[SHA256_DIGEST_SIZE]); int ceph_crypto_init(void); void ceph_crypto_shutdown(void); diff --git a/net/ceph/messenger_v2.c b/net/ceph/messenger_v2.c index 1cd86fef497ee..1b5a0bf36f5e6 100644 --- a/net/ceph/messenger_v2.c +++ b/net/ceph/messenger_v2.c @@ -2396,7 +2396,7 @@ static int process_auth_reply_more(struct ceph_connection *con, */ static int process_auth_done(struct ceph_connection *con, void *p, void *end) { - u8 session_key_buf[CEPH_KEY_LEN + 16]; + u8 session_key_buf[CEPH_MAX_KEY_LEN + 16]; u8 con_secret_buf[CEPH_MAX_CON_SECRET_LEN + 16]; u8 *session_key = PTR_ALIGN(&session_key_buf[0], 16); u8 *con_secret = PTR_ALIGN(&con_secret_buf[0], 16);