From 14cea317da4b30c478a1676ee5534b123aa8f074 Mon Sep 17 00:00:00 2001 From: EquityBot <333319867+EquityBot@users.noreply.github.com> Date: Mon, 2 Nov 2026 16:21:31 +1100 Subject: [PATCH 1/4] fix(letters): encode the address in a mailto link The register check accepts any address RFC 5322 allows, so a register entry's address may hold '?', '&', '#' or '%'. mailto() wrote it unencoded, so an entry such as x?cc=attacker%40evil.example%2Cy@broker.example.com.au ended the address early and added a cc field: the user's request, with their personal details, would also go to the attacker. Each part of the address around its '@' is now percent-encoded like the subject and body. --- src/core/letters.rs | 31 ++++++++++++++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-) diff --git a/src/core/letters.rs b/src/core/letters.rs index b58e68e..5fc6a97 100644 --- a/src/core/letters.rs +++ b/src/core/letters.rs @@ -260,9 +260,12 @@ pub fn eml(letter: &Letter) -> String { /// browsers reliably accept. pub fn mailto(letter: &Letter) -> Option { const LIMIT: usize = 2000; + // The address is encoded as well, keeping its `@`: a register address may hold `?`, `%`, + // `#` or `&` (RFC 5322 allows them), which would otherwise end it and add fields to the link. + let to: Vec = letter.to.split('@').map(percent_encode).collect(); let link = format!( "mailto:{}?subject={}&body={}", - letter.to, + to.join("@"), percent_encode(&letter.subject), percent_encode(&letter.body.replace('\n', "\r\n")) ); @@ -365,6 +368,32 @@ mod tests { assert_eq!(mailto(&letter(&"x".repeat(2000))), None); } + #[test] + fn a_register_address_cannot_add_fields_to_a_mailto_link() { + // The register check accepts this address, and unencoded it would copy the request to + // attacker@evil.example. + let to = "x?cc=attacker%40evil.example%2Cy@broker.example.com.au"; + assert!(crate::core::register::is_email(to)); + let link = mailto(&Letter { + to: to.to_owned(), + ..letter("Hello") + }) + .unwrap(); + let (address, fields) = link + .strip_prefix("mailto:") + .unwrap() + .split_once('?') + .unwrap(); + assert_eq!( + address, + "x%3Fcc%3Dattacker%2540evil.example%252Cy@broker.example.com.au" + ); + assert_eq!( + fields, + "subject=Privacy%20Act%20request%20%5BGS-TEST1%5D&body=Hello" + ); + } + #[test] fn tags_use_crockford_base32() { assert_eq!(tag(0), "GS-00000"); From abac38960ba8c15aca862dd1dae1ec61ecb3ac1c Mon Sep 17 00:00:00 2001 From: EquityBot <333319867+EquityBot@users.noreply.github.com> Date: Mon, 2 Nov 2026 16:21:31 +1100 Subject: [PATCH 2/4] test(fuzz): fuzz the register check and the letters weekly register_letters runs an entry file through the register check and, when it passes, composes its letters and checks the eml header block and the mailto fields. letter_text runs the renderer and the line wrapper on any text and width. CI fuzzes each for 5 minutes every Monday, seeded from registry/au and letters/au; Dependabot covers the fuzz crate's lockfile. --- .github/dependabot.yml | 2 +- .github/workflows/fuzz.yml | 39 + CONTRIBUTING.md | 2 + fuzz/.gitignore | 4 + fuzz/Cargo.lock | 1973 +++++++++++++++++++++++++ fuzz/Cargo.toml | 30 + fuzz/fuzz_targets/letter_text.rs | 27 + fuzz/fuzz_targets/register_letters.rs | 80 + 8 files changed, 2156 insertions(+), 1 deletion(-) create mode 100644 .github/workflows/fuzz.yml create mode 100644 fuzz/.gitignore create mode 100644 fuzz/Cargo.lock create mode 100644 fuzz/Cargo.toml create mode 100644 fuzz/fuzz_targets/letter_text.rs create mode 100644 fuzz/fuzz_targets/register_letters.rs diff --git a/.github/dependabot.yml b/.github/dependabot.yml index 2c480d2..1b4c0ee 100644 --- a/.github/dependabot.yml +++ b/.github/dependabot.yml @@ -15,7 +15,7 @@ updates: # Policy pins move by hand to a reviewed release-policy commit. - dependency-name: "ryanduguid/release-policy/.github/workflows/*" - package-ecosystem: cargo - directory: / + directories: [/, /fuzz] schedule: interval: weekly cooldown: diff --git a/.github/workflows/fuzz.yml b/.github/workflows/fuzz.yml new file mode 100644 index 0000000..591b75b --- /dev/null +++ b/.github/workflows/fuzz.yml @@ -0,0 +1,39 @@ +name: Fuzz + +on: + schedule: + - cron: '41 3 * * 1' + workflow_dispatch: + +permissions: + contents: read + +jobs: + fuzz: + strategy: + fail-fast: false + matrix: + target: [register_letters, letter_text] + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1 + with: + persist-credentials: false + - name: Install nightly and the pinned cargo-fuzz + run: | + rustup toolchain install nightly --profile minimal + cargo +nightly install cargo-fuzz --locked --version 0.13.2 + # The shipped register seeds the entry target and the letter templates the text target. + - name: Fuzz for 5 minutes + env: + TARGET: ${{ matrix.target }} + run: | + if [ "$TARGET" = register_letters ]; then seeds=registry/au; else seeds=letters/au; fi + mkdir -p "fuzz/corpus/$TARGET" + cargo +nightly fuzz run "$TARGET" "fuzz/corpus/$TARGET" "$seeds" -- -max_total_time=300 -rss_limit_mb=4096 + - name: Keep the crashing input + if: failure() + uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2 + with: + name: fuzz-${{ matrix.target }} + path: fuzz/artifacts/${{ matrix.target }} diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index 4489ef7..2cc4529 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -23,3 +23,5 @@ cargo run -- registry check --path registry/au ``` New functionality and bug fixes come with automated tests, in `tests/` or a `#[cfg(test)]` module beside the code, and CI runs them on Linux and Windows. + +Changes to the register check or the letters should also survive the fuzz targets in `fuzz/`, which CI runs for 5 minutes each every Monday. 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+# Keep the fuzz crate out of the parent workspace. +[workspace] + +[[bin]] +name = "register_letters" +path = "fuzz_targets/register_letters.rs" +test = false +doc = false +bench = false + +[[bin]] +name = "letter_text" +path = "fuzz_targets/letter_text.rs" +test = false +doc = false +bench = false diff --git a/fuzz/fuzz_targets/letter_text.rs b/fuzz/fuzz_targets/letter_text.rs new file mode 100644 index 0000000..7ed1b7f --- /dev/null +++ b/fuzz/fuzz_targets/letter_text.rs @@ -0,0 +1,27 @@ +#![no_main] +//! The letter renderer and the line wrapper, on any text and width. + +use std::collections::BTreeMap; + +use ghostsoap::core::letters::{render, wrap}; +use libfuzzer_sys::fuzz_target; + +fuzz_target!(|input: (u8, &str)| { + let (width, text) = input; + let width = usize::from(width % 100) + 1; + for line in wrap(text, width).lines() { + // Only a single word may run past the width. + assert!( + line.chars().count() <= width || !line.contains(' '), + "{line:?} is over {width}" + ); + } + let values = BTreeMap::from([("name", Some("Alex {{name}}".to_owned())), ("gone", None)]); + if let Ok(out) = render(text, &values) { + // Rendering keeps or drops whole lines and never adds one, though a value holds `{{`. + assert!( + out.lines().count() <= text.lines().count().max(1), + "{out:?}" + ); + } +}); diff --git a/fuzz/fuzz_targets/register_letters.rs b/fuzz/fuzz_targets/register_letters.rs new file mode 100644 index 0000000..fa619f3 --- /dev/null +++ b/fuzz/fuzz_targets/register_letters.rs @@ -0,0 +1,80 @@ +#![no_main] +//! A register entry file, which pull requests add, through the register check and on to the +//! letters a checked entry produces. + +use chrono::NaiveDate; +use ghostsoap::core::letters::{self, Request}; +use ghostsoap::core::profile::Profile; +use ghostsoap::core::register::{ChannelKind, RegisterFiles, SourceFile, check, parse_register}; +use libfuzzer_sys::fuzz_target; + +fuzz_target!(|data: &[u8]| { + let Ok(text) = std::str::from_utf8(data) else { + return; + }; + let mut file = SourceFile { + name: "entry.toml".to_owned(), + text: text.to_owned(), + }; + // The check wants each entry in a file named after its id. + let files = RegisterFiles { + entries: vec![file.clone()], + packs: Vec::new(), + }; + if let Some(id) = parse_register(&files) + .ok() + .and_then(|r| r.entries.into_keys().next()) + { + file.name = format!("{id}.toml"); + } + let today = NaiveDate::from_ymd_opt(2026, 11, 2).unwrap(); + if check(std::slice::from_ref(&file), &[], today).errors() > 0 { + return; + } + let Ok(register) = parse_register(&RegisterFiles { + entries: vec![file], + packs: Vec::new(), + }) else { + return; + }; + let profile = Profile { + full_name: "Alex Example".to_owned(), + alias_names: vec!["Alex E".to_owned()], + email: Some("alex@example.com".to_owned()), + phone: Some("0400 000 000".to_owned()), + date_of_birth: Some("1990-01-02".to_owned()), + address: Some("1 Example St, Sydney NSW 2000".to_owned()), + previous_addresses: vec!["2 Sample Rd, Hobart TAS 7000".to_owned()], + postcode: Some("2000".to_owned()), + }; + for entry in register.entries.values() { + for channel in entry.channels.iter().filter(|c| !c.levers.is_empty()) { + let request = Request { + channel, + levers: &channel.levers, + detail: Some("account 123"), + date: today, + tag: "GS-7K3QX", + }; + let Ok(letter) = letters::compose(entry, &profile, &request) else { + continue; + }; + if channel.kind != ChannelKind::Email { + continue; + } + // A checked entry's address and subject are one header line each. + let eml = letters::eml(&letter); + let headers = eml.split("\r\n\r\n").next().unwrap(); + assert_eq!(headers.split("\r\n").count(), 6, "{headers:?}"); + // Its address cannot end early and add fields to the mailto link. + if let Some(link) = letters::mailto(&letter) { + let fields = link.split_once('?').map(|(_, f)| f).unwrap(); + assert!( + fields.starts_with("subject=") && !link.contains('#'), + "{link}" + ); + assert_eq!(fields.matches('&').count(), 1, "{link}"); + } + } + } +}); From 07fea3a2794d601387f303ec9ed7e5283ddfb9cf Mon Sep 17 00:00:00 2001 From: EquityBot <333319867+EquityBot@users.noreply.github.com> Date: Mon, 2 Nov 2026 17:09:20 +1100 Subject: [PATCH 3/4] test(fuzz): check every mailto link field by decoding it Review found that the link check let an address such as x?subject=spoof@broker.example.com.au through on the old construction, since it only counted fields. The fuzz target now decodes the link's address, subject and body and compares them with the letter's. A whole request is usually over the 2,000-character link limit (none of the 161 letters the 81 shipped entries compose gets a link), so the target also checks the link of a short copy of each letter. --- fuzz/fuzz_targets/register_letters.rs | 63 +++++++++++++++++++++++---- 1 file changed, 55 insertions(+), 8 deletions(-) diff --git a/fuzz/fuzz_targets/register_letters.rs b/fuzz/fuzz_targets/register_letters.rs index fa619f3..084e904 100644 --- a/fuzz/fuzz_targets/register_letters.rs +++ b/fuzz/fuzz_targets/register_letters.rs @@ -66,15 +66,62 @@ fuzz_target!(|data: &[u8]| { let eml = letters::eml(&letter); let headers = eml.split("\r\n\r\n").next().unwrap(); assert_eq!(headers.split("\r\n").count(), 6, "{headers:?}"); - // Its address cannot end early and add fields to the mailto link. - if let Some(link) = letters::mailto(&letter) { - let fields = link.split_once('?').map(|(_, f)| f).unwrap(); - assert!( - fields.starts_with("subject=") && !link.contains('#'), - "{link}" - ); - assert_eq!(fields.matches('&').count(), 1, "{link}"); + // A whole request is usually too long for a mailto link, so a short one is checked too. + let short = letters::Letter { + body: "Hello".to_owned(), + ..letter.clone() + }; + for letter in [&letter, &short] { + if let Some(link) = letters::mailto(letter) { + check_mailto(letter, &link); + } } } } }); + +/// The link holds exactly the letter's address, subject and body: an address cannot end +/// early and add fields. +fn check_mailto(letter: &letters::Letter, link: &str) { + let (to, fields) = link + .strip_prefix("mailto:") + .and_then(|l| l.split_once('?')) + .unwrap(); + let (subject, body) = fields + .strip_prefix("subject=") + .and_then(|f| f.split_once("&body=")) + .unwrap_or_else(|| panic!("{link}")); + assert_eq!(decode(to).as_deref(), Some(letter.to.as_str()), "{link}"); + assert_eq!( + decode(subject).as_deref(), + Some(letter.subject.as_str()), + "{link}" + ); + assert_eq!( + decode(body), + Some(letter.body.replace('\n', "\r\n")), + "{link}" + ); + assert!( + !link.contains('#') && fields.matches('&').count() == 1, + "{link}" + ); +} + +/// A percent-decoded link component; `None` if an escape is malformed or the result is not UTF-8. +fn decode(text: &str) -> Option { + let mut out = Vec::new(); + let mut bytes = text.bytes(); + while let Some(byte) = bytes.next() { + if byte != b'%' { + out.push(byte); + continue; + } + let hex = [bytes.next()?, bytes.next()?]; + if !hex.iter().all(u8::is_ascii_hexdigit) { + return None; + } + out.push(u8::from_str_radix(std::str::from_utf8(&hex).ok()?, 16).ok()?); + } + String::from_utf8(out).ok() +} From a37378f69b2bfd29e7ba6a8a2ceefbc056cff203 Mon Sep 17 00:00:00 2001 From: EquityBot <333319867+EquityBot@users.noreply.github.com> Date: Mon, 2 Nov 2026 20:32:46 +1100 Subject: [PATCH 4/4] fuzz: resolve the fuzz lock from the shipped Cargo.lock The fuzz crate's lock was generated fresh, so it held newer versions of crates the parent lock pins. Seeding it from Cargo.lock means the targets fuzz the dependency versions that ship; it adds only the fuzzing crates. --- fuzz/Cargo.lock | 31 +++++++++++++++++++------------ 1 file changed, 19 insertions(+), 12 deletions(-) diff --git a/fuzz/Cargo.lock b/fuzz/Cargo.lock index 8460602..27c6130 100644 --- a/fuzz/Cargo.lock +++ b/fuzz/Cargo.lock @@ -982,9 +982,9 @@ dependencies = [ [[package]] name = "js-sys" -version = "0.3.107" +version = "0.3.106" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "8dc09d2154098bbf4ef54eab6b117a3c24cbbffe94046b16ee6d6d4510584d3a" +checksum = "7883d941dae510fb2d978fc3fe018c71c9e2892fd38854de3e8b92c2e5ad9cc5" dependencies = [ "cfg-if", "futures-util", @@ -1043,9 +1043,9 @@ dependencies = [ [[package]] name = "log" -version = "0.4.35" +version = "0.4.34" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "5d15f86d12da44cd8d4ec3c73984537eb7f4cadcb9776a575a0a8a05ca11005c" +checksum = "f9f8bd3e56ce4dfc153cf470fffbfa98c7620958b312ca5c3a4b8d5181fd13c6" [[package]] name = "memchr" @@ -1099,6 +1099,12 @@ dependencies = [ "autocfg", ] +[[package]] +name = "once_cell" +version = "1.21.4" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "9f7c3e4beb33f85d45ae3e3a1792185706c8e16d043238c593331cc7cd313b50" + [[package]] name = "once_cell_polyfill" version = "1.70.2" @@ -1773,11 +1779,12 @@ checksum = "ccf3ec651a847eb01de73ccad15eb7d99f80485de043efb2f370cd654f4ea44b" [[package]] name = "wasm-bindgen" -version = "0.2.130" +version = "0.2.129" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "a0181c14ddd6c7b8b0b0132a5f1ea2f32be0d893cd3ea97b6e3b28886b8a3d1c" +checksum = "9bb54f33acc68fd454578d9820b0bde1a1a3d17aa17bb7b6595806d02886d409" dependencies = [ "cfg-if", + "once_cell", "rustversion", "wasm-bindgen-macro", "wasm-bindgen-shared", @@ -1785,9 +1792,9 @@ dependencies = [ [[package]] name = "wasm-bindgen-macro" -version = "0.2.130" +version = "0.2.129" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "6e931a02a39abdbf66966fc35902b5ed58344750a70885bed4ebb3d8eaf28ed9" +checksum = "2e29d0c35b16e224a7eeb5cd2d25e3e1968fbd65604117b44d3b789d00ee8535" dependencies = [ "quote", "wasm-bindgen-macro-support", @@ -1795,9 +1802,9 @@ dependencies = [ [[package]] name = "wasm-bindgen-macro-support" -version = "0.2.130" +version = "0.2.129" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "2ca4b54280e455bd831e33a6b8e734baf432fe63fbc35c42ac14ce67a043a53a" +checksum = "6f501a8bc3719dba86ef8ae4728879c08001bea749eb1333ac5b91e040e2a6b7" dependencies = [ "bumpalo", "proc-macro2", @@ -1808,9 +1815,9 @@ dependencies = [ [[package]] name = "wasm-bindgen-shared" -version = "0.2.130" +version = "0.2.129" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "3b1f9c3798725016c6ee5f2f57869ec0831e8bbc0ab0310a86e787e97f41389e" +checksum = "23f0c9c52aa7cd7d77769a4cfe2a9adb1b331f489a41d912ce14513d5ab995c6" dependencies = [ "unicode-ident", ]