diff --git a/.github/workflows/fuzz_build.yml b/.github/workflows/fuzz_build.yml new file mode 100644 index 00000000..610e6edd --- /dev/null +++ b/.github/workflows/fuzz_build.yml @@ -0,0 +1,27 @@ +name: fuzz-build + +on: + pull_request: + paths: + - "fuzz/**" + push: + branches: master + +defaults: + run: + working-directory: fuzz + +env: + CARGO_INCREMENTAL: 0 + RUSTFLAGS: "-Dwarnings" + +jobs: + build: + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v4 + - uses: RustCrypto/actions/cargo-cache@master + - uses: dtolnay/rust-toolchain@master + with: + toolchain: stable + - run: cargo build diff --git a/Cargo.toml b/Cargo.toml index a61f628e..6c986962 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -10,7 +10,7 @@ members = [ "sha-crypt", "yescrypt" ] -exclude = ["benches"] +exclude = ["benches", "fuzz"] [profile.dev] opt-level = 2 diff --git a/fuzz/.gitignore b/fuzz/.gitignore new file mode 100644 index 00000000..1a45eee7 --- /dev/null +++ b/fuzz/.gitignore @@ -0,0 +1,4 @@ +target +corpus +artifacts +coverage diff --git a/fuzz/Cargo.toml b/fuzz/Cargo.toml new file mode 100644 index 00000000..fe54effb --- /dev/null +++ b/fuzz/Cargo.toml @@ -0,0 +1,19 @@ +[package] +name = "fuzz" +version = "0.0.0" +publish = false +edition = "2018" + +[package.metadata] +cargo-fuzz = true + +[dependencies] +libfuzzer-sys = "0.4" +scrypt = { path = "../scrypt", features = ["simple"]} + +[[bin]] +name = "scrypt" +path = "fuzz_targets/scrypt.rs" +test = false +doc = false +bench = false diff --git a/fuzz/LICENSE-APACHE b/fuzz/LICENSE-APACHE new file mode 100644 index 00000000..78173fa2 --- /dev/null +++ b/fuzz/LICENSE-APACHE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + +TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + +1. 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IN NO EVENT +SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY +CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR +IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER +DEALINGS IN THE SOFTWARE. diff --git a/fuzz/fuzz_targets/scrypt.rs b/fuzz/fuzz_targets/scrypt.rs new file mode 100644 index 00000000..48916dab --- /dev/null +++ b/fuzz/fuzz_targets/scrypt.rs @@ -0,0 +1,50 @@ +#![no_main] +use libfuzzer_sys::arbitrary::{Arbitrary, Result, Unstructured}; +use libfuzzer_sys::fuzz_target; +use scrypt::password_hash::{ + Ident, PasswordHash, PasswordHasher, PasswordVerifier, Salt, SaltString, +}; +use scrypt::{scrypt, Scrypt}; + +#[derive(Debug)] +pub struct ScryptRandParams(pub scrypt::Params); + +impl<'a> Arbitrary<'a> for ScryptRandParams { + fn arbitrary(u: &mut Unstructured<'a>) -> Result { + let log_n = u.int_in_range(0..=15)?; + let r = u.int_in_range(1..=32)?; + let p = u.int_in_range(1..=16)?; + let len = u.int_in_range(10..=64)?; + + let params = scrypt::Params::new(log_n, r, p, len).unwrap(); + Ok(Self(params)) + } +} + +fuzz_target!(|data: (&[u8], &[u8], ScryptRandParams)| { + let (password, salt, ScryptRandParams(params)) = data; + + // Check direct hashing + let mut result = [0u8; 64]; + scrypt(password, salt, ¶ms, &mut result).unwrap(); + + // Check PHC hashing + if salt.len() < Salt::MIN_LENGTH { + return; + } + let salt_string = SaltString::encode_b64(salt).unwrap(); + let phc_hash = Scrypt + .hash_password_customized( + password, + Some(Ident::new_unwrap("scrypt")), + None, + params, + &salt_string, + ) + .unwrap() + .to_string(); + + // Check PHC verification + let hash = PasswordHash::new(&phc_hash).unwrap(); + Scrypt.verify_password(password, &hash).unwrap(); +});