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@@ +use ssh_key::Algorithm; +use thiserror::Error; +use x509_parser::prelude::X509Error; + +#[derive(Error, Debug)] +pub enum Error { + #[error("Attestation decoding failed: {0}")] + AttestationDecodeError(ssh_encoding::Error), + #[error("Attestation auth data invalid")] + AttestationInvalidAuthData, + #[error("Attestation certificate decoding failed: {0}")] + AttestationCertDecodeError(X509Error), + #[error("SSH public key not FIDO backed")] + NonFidoSshKey, + #[error("Attestation verification failed")] + AttestationVerificationFailed, + #[error("Attestation certificate signature invalid")] + InvalidAttestationCertSignature, + #[error("Invalid root CA {0}")] + InvalidRootCa(String), + #[error("FIDO public key type unsupported")] + UnsupportedFidoKeyType, + #[error("SSH public key type {} does not match FIDO public key type {}", .ssh.as_str(), .fido.as_str())] + SshFidoTypeMismatch { ssh: Algorithm, fido: Algorithm }, + #[error("SSH public key des not match FIDO public key")] + SshFidoKeyMismatch, +} diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..373d6d4 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,90 @@ +mod error; +mod ssh_attest; + +use ctap_hid_fido2::{ + public_key::PublicKeyType, + verifier, +}; +pub use error::Error; +use ssh_attest::SshAttestationInfo; +use ssh_encoding::Decode; +use ssh_key::{public::KeyData, Algorithm, PublicKey}; +pub use x509_parser; +use x509_parser::{prelude::*, x509::X509Name}; + +fn get_first_cn_as_str<'a>(name: &'a X509Name<'_>) -> Option<&'a str> { + name.iter_common_name() + .next() + .and_then(|cn| cn.as_str().ok()) +} + + +pub fn verify_attestation( + root_cas: Vec>, + ssh_attest: Vec, + challenge: Vec, + ssh_pubkey: PublicKey, +) -> Result<(), Error> { + // Decode the SSH attestation file + let attestation = SshAttestationInfo::decode(&mut ssh_attest.as_slice()) + .map_err(|e| Error::AttestationDecodeError(e))?; + let attestation_cert = attestation + .decode_cert() + .map_err(|e| Error::AttestationCertDecodeError(e))?; + let attestation = attestation.to_fido_attestation().map_err(|_e| Error::AttestationInvalidAuthData)?; + + // Extract the RPID from the SSH public key + let application = match ssh_pubkey.key_data() { + KeyData::SkEcdsaSha2NistP256(pubkey) => pubkey.application(), + KeyData::SkEd25519(pubkey) => pubkey.application(), + _ => return Err(Error::NonFidoSshKey.into()), + }; + + // Verify the attestation RPID & signature + let verify_result = verifier::verify_attestation(&application, &challenge, &attestation); + if !verify_result.is_success { + return Err(Error::AttestationVerificationFailed); + } + + // Verify the attestation certificate + let attest_issuing_cn = get_first_cn_as_str(attestation_cert.tbs_certificate.issuer()).unwrap(); + let root_ca = root_cas + .iter() + .find(|root_ca| { + get_first_cn_as_str(root_ca.tbs_certificate.subject()).unwrap() == attest_issuing_cn + }) + .ok_or_else(|| Error::InvalidRootCa(attest_issuing_cn.to_string()))?; + if !attestation_cert + .verify_signature(Some(&root_ca.tbs_certificate.subject_pki)) + .is_ok() + { + return Err(Error::InvalidAttestationCertSignature.into()); + } + + let fido_pubkey = &verify_result.credential_public_key; + + // Verify the FIDO public key is the same type as the SSH public key + let fido_pubkey_alg = match fido_pubkey.key_type { + PublicKeyType::Ecdsa256 => Algorithm::SkEcdsaSha2NistP256, + PublicKeyType::Ed25519 => Algorithm::SkEd25519, + PublicKeyType::Unknown => return Err(Error::UnsupportedFidoKeyType), + }; + + if fido_pubkey_alg != ssh_pubkey.algorithm() { + return Err(Error::SshFidoTypeMismatch { + ssh: ssh_pubkey.algorithm(), + fido: fido_pubkey_alg, + }); + } + + // Verify that the SSH public key data matches the FIDO public key data + let key_data = match ssh_pubkey.key_data() { + KeyData::SkEcdsaSha2NistP256(key) => key.ec_point().as_bytes(), + KeyData::SkEd25519(key) => key.public_key().0.as_slice(), + _ => unreachable!(), + }; + if key_data != fido_pubkey.der { + return Err(Error::SshFidoKeyMismatch.into()); + } + Ok(()) +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..e9b909c --- /dev/null +++ b/src/main.rs @@ -0,0 +1,37 @@ +use std::path::Path; + +use anyhow::anyhow; +use ssh_attest_verifier::verify_attestation; +use x509_parser::prelude::*; + +fn main() -> anyhow::Result<()> { + let root_cas = std::fs::read_dir("root_cas")?.collect::, _>>()?; + let root_cas = root_cas + .into_iter() + .map(|entry| -> Result<_, anyhow::Error> { + let root_ca = std::fs::read(entry.path())?; + let entry_path = entry.path().to_string_lossy().into_owned(); + let root_ca = match parse_x509_pem(&root_ca) { + Ok((rem, pem)) => { + assert!(rem.is_empty()); + if pem.label != "CERTIFICATE" { + return Err(anyhow!("{} is not a certificate", entry_path)); + } + parse_x509_certificate(pem.contents.leak()) + .map_err(|e| anyhow!("X.509 parsing failed for {}: {:?}", entry_path, e))? + .1 + } + Err(e) => Err(anyhow!("PEM parsing failed for {}: {:?}", entry_path, e))?, + }; + Ok(root_ca) + }) + .collect::, _>>()?; + + let ssh_attest = std::fs::read("id_ecdsa_rustgen_sk_attest.bin")?; + let challenge = std::fs::read("id_ecdsa_rustgen_sk_attest_chall.bin")?; + let ssh_pubkey = ssh_key::PublicKey::read_openssh_file(Path::new("id_ecdsa_rustgen_sk.pub"))?; + + verify_attestation(root_cas, ssh_attest, challenge, ssh_pubkey)?; + println!("Attestation verified successfully"); + Ok(()) +} diff --git a/src/ssh_attest.rs b/src/ssh_attest.rs new file mode 100644 index 0000000..006d6d0 --- /dev/null +++ b/src/ssh_attest.rs @@ -0,0 +1,109 @@ +use std::str::FromStr; + +use ciborium::Value; +use ctap_hid_fido2::fidokey::make_credential::{Attestation, make_credential_response}; +use ssh_encoding::{Decode, Label, LabelError}; +use x509_parser::{nom::Finish, prelude::*}; + +#[non_exhaustive] +#[derive(Clone, Copy, Debug, PartialEq, Eq)] +pub enum Version { + V00, + V01, +} + +impl AsRef for Version { + fn as_ref(&self) -> &str { + match self { + Self::V00 => "ssh-sk-attest-v00", + Self::V01 => "ssh-sk-attest-v01", + } + } +} + +impl FromStr for Version { + type Err = LabelError; + + fn from_str(s: &str) -> Result { + match s { + "ssh-sk-attest-v00" => Ok(Self::V00), + "ssh-sk-attest-v01" => Ok(Self::V01), + _ => Err(LabelError::new(s.into())), + } + } +} + +impl Label for Version {} + +#[non_exhaustive] +pub struct SshAttestationInfo { + pub version: Version, + pub attestation_cert: Vec, + pub enroll_sig: Vec, + pub auth_data: Option>, +} + +impl SshAttestationInfo { + pub fn decode_cert(&self) -> Result, X509Error> { + X509Certificate::from_der(&self.attestation_cert) + .finish() + .map(|(_, cert)| cert) + } + + pub fn to_fido_attestation(&self) -> Result { + let mut attestation_map_bytes = Vec::new(); + ciborium::into_writer( + &Value::from( + [ + (0x01.into(), "packed".into()), + ( + 0x02.into(), + self.auth_data.as_deref().unwrap().into(), + ), + ( + 0x03.into(), + [ + // TODO: Don't hardcode algorithm + // -7: ECDSA P256 + ("alg".into(), (-7).into()), + ("sig".into(), self.enroll_sig.as_slice().into()), + ( + "x5c".into(), + [Value::from(self.attestation_cert.as_slice())] + .as_slice() + .into(), + ), + ] + .as_slice() + .into(), + ), + ] + .as_slice(), + ), + &mut attestation_map_bytes, + ) + .expect("Failed to serialize CBOR attestation info"); + make_credential_response::parse_cbor(&attestation_map_bytes) + + } +} + +impl Decode for SshAttestationInfo { + type Error = ssh_encoding::Error; + + fn decode(reader: &mut impl ssh_encoding::Reader) -> core::result::Result { + let version = Version::decode(reader)?; + let attestation_cert = Vec::decode(reader)?; + let enroll_sig = Vec::decode(reader)?; + let auth_data = match version { + Version::V00 => None, + Version::V01 => Some(Vec::decode(reader)?), + }; + Ok(Self { + version, + attestation_cert, + enroll_sig, + auth_data, + }) + } +}