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use alloc::sync::Arc;
use alloc::vec::Vec;
use pki_types::{CertificateDer, CertificateRevocationListDer, UnixTime};
use webpki::{CertRevocationList, ExpirationPolicy, RevocationCheckDepth, UnknownStatusPolicy};
use super::{pki_error, VerifierBuilderError};
#[cfg(doc)]
use crate::crypto;
use crate::crypto::{CryptoProvider, WebPkiSupportedAlgorithms};
#[cfg(doc)]
use crate::server::ServerConfig;
use crate::verify::{
ClientCertVerified, ClientCertVerifier, DigitallySignedStruct, HandshakeSignatureValid,
NoClientAuth,
};
use crate::webpki::parse_crls;
use crate::webpki::verify::{verify_tls12_signature, verify_tls13_signature, ParsedCertificate};
#[cfg(doc)]
use crate::ConfigBuilder;
use crate::{DistinguishedName, Error, RootCertStore, SignatureScheme};
/// A builder for configuring a `webpki` client certificate verifier.
///
/// For more information, see the [`WebPkiClientVerifier`] documentation.
#[derive(Debug, Clone)]
pub struct ClientCertVerifierBuilder {
roots: Arc<RootCertStore>,
root_hint_subjects: Vec<DistinguishedName>,
crls: Vec<CertificateRevocationListDer<'static>>,
revocation_check_depth: RevocationCheckDepth,
unknown_revocation_policy: UnknownStatusPolicy,
revocation_expiration_policy: ExpirationPolicy,
anon_policy: AnonymousClientPolicy,
supported_algs: WebPkiSupportedAlgorithms,
}
impl ClientCertVerifierBuilder {
pub(crate) fn new(
roots: Arc<RootCertStore>,
supported_algs: WebPkiSupportedAlgorithms,
) -> Self {
Self {
root_hint_subjects: roots.subjects(),
roots,
crls: Vec::new(),
anon_policy: AnonymousClientPolicy::Deny,
revocation_check_depth: RevocationCheckDepth::Chain,
unknown_revocation_policy: UnknownStatusPolicy::Deny,
revocation_expiration_policy: ExpirationPolicy::Ignore,
supported_algs,
}
}
/// Clear the list of trust anchor hint subjects.
///
/// By default, the client cert verifier will use the subjects provided by the root cert
/// store configured for client authentication. Calling this function will remove these
/// hint subjects, indicating the client should make a free choice of which certificate
/// to send.
///
/// See [`ClientCertVerifier::root_hint_subjects`] for more information on
/// circumstances where you may want to clear the default hint subjects.
pub fn clear_root_hint_subjects(mut self) -> Self {
self.root_hint_subjects = Vec::default();
self
}
/// Add additional [`DistinguishedName`]s to the list of trust anchor hint subjects.
///
/// By default, the client cert verifier will use the subjects provided by the root cert
/// store configured for client authentication. Calling this function will add to these
/// existing hint subjects. Calling this function with empty `subjects` will have no
/// effect.
///
/// See [`ClientCertVerifier::root_hint_subjects`] for more information on
/// circumstances where you may want to override the default hint subjects.
pub fn add_root_hint_subjects(
mut self,
subjects: impl IntoIterator<Item = DistinguishedName>,
) -> Self {
self.root_hint_subjects.extend(subjects);
self
}
/// Verify the revocation state of presented client certificates against the provided
/// certificate revocation lists (CRLs). Calling `with_crls` multiple times appends the
/// given CRLs to the existing collection.
///
/// By default all certificates in the verified chain built from the presented client
/// certificate to a trust anchor will have their revocation status checked. Calling
/// [`only_check_end_entity_revocation`][Self::only_check_end_entity_revocation] will
/// change this behavior to only check the end entity client certificate.
///
/// By default if a certificate's revocation status can not be determined using the
/// configured CRLs, it will be treated as an error. Calling
/// [`allow_unknown_revocation_status`][Self::allow_unknown_revocation_status] will change
/// this behavior to allow unknown revocation status.
pub fn with_crls(
mut self,
crls: impl IntoIterator<Item = CertificateRevocationListDer<'static>>,
) -> Self {
self.crls.extend(crls);
self
}
/// Only check the end entity certificate revocation status when using CRLs.
///
/// If CRLs are provided using [`with_crls`][Self::with_crls] only check the end entity
/// certificate's revocation status. Overrides the default behavior of checking revocation
/// status for each certificate in the verified chain built to a trust anchor
/// (excluding the trust anchor itself).
///
/// If no CRLs are provided then this setting has no effect. Neither the end entity certificate
/// or any intermediates will have revocation status checked.
pub fn only_check_end_entity_revocation(mut self) -> Self {
self.revocation_check_depth = RevocationCheckDepth::EndEntity;
self
}
/// Allow unauthenticated clients to connect.
///
/// Clients that offer a client certificate issued by a trusted root, and clients that offer no
/// client certificate will be allowed to connect.
pub fn allow_unauthenticated(mut self) -> Self {
self.anon_policy = AnonymousClientPolicy::Allow;
self
}
/// Allow unknown certificate revocation status when using CRLs.
///
/// If CRLs are provided with [`with_crls`][Self::with_crls] and it isn't possible to
/// determine the revocation status of a certificate, do not treat it as an error condition.
/// Overrides the default behavior where unknown revocation status is considered an error.
///
/// If no CRLs are provided then this setting has no effect as revocation status checks
/// are not performed.
pub fn allow_unknown_revocation_status(mut self) -> Self {
self.unknown_revocation_policy = UnknownStatusPolicy::Allow;
self
}
/// Enforce the CRL nextUpdate field (i.e. expiration)
///
/// If CRLs are provided with [`with_crls`][Self::with_crls] and the verification time is
/// beyond the time in the CRL nextUpdate field, it is expired and treated as an error condition.
/// Overrides the default behavior where expired CRLs are not treated as an error condition.
///
/// If no CRLs are provided then this setting has no effect as revocation status checks
/// are not performed.
pub fn enforce_revocation_expiration(mut self) -> Self {
self.revocation_expiration_policy = ExpirationPolicy::Enforce;
self
}
/// Build a client certificate verifier. The built verifier will be used for the server to offer
/// client certificate authentication, to control how offered client certificates are validated,
/// and to determine what to do with anonymous clients that do not respond to the client
/// certificate authentication offer with a client certificate.
///
/// If `with_signature_verification_algorithms` was not called on the builder, a default set of
/// signature verification algorithms is used, controlled by the selected [`CryptoProvider`].
///
/// Once built, the provided `Arc<dyn ClientCertVerifier>` can be used with a Rustls
/// [`ServerConfig`] to configure client certificate validation using
/// [`with_client_cert_verifier`][ConfigBuilder<ClientConfig, WantsVerifier>::with_client_cert_verifier].
///
/// # Errors
/// This function will return a [`VerifierBuilderError`] if:
/// 1. No trust anchors have been provided.
/// 2. DER encoded CRLs have been provided that can not be parsed successfully.
pub fn build(self) -> Result<Arc<dyn ClientCertVerifier>, VerifierBuilderError> {
if self.roots.is_empty() {
return Err(VerifierBuilderError::NoRootAnchors);
}
Ok(Arc::new(WebPkiClientVerifier::new(
self.roots,
self.root_hint_subjects,
parse_crls(self.crls)?,
self.revocation_check_depth,
self.unknown_revocation_policy,
self.revocation_expiration_policy,
self.anon_policy,
self.supported_algs,
)))
}
}
/// A client certificate verifier that uses the `webpki` crate[^1] to perform client certificate
/// validation.
///
/// It must be created via the [`WebPkiClientVerifier::builder()`] or
/// [`WebPkiClientVerifier::builder_with_provider()`] functions.
///
/// Once built, the provided `Arc<dyn ClientCertVerifier>` can be used with a Rustls [`ServerConfig`]
/// to configure client certificate validation using [`with_client_cert_verifier`][ConfigBuilder<ClientConfig, WantsVerifier>::with_client_cert_verifier].
///
/// Example:
///
/// To require all clients present a client certificate issued by a trusted CA:
/// ```no_run
/// # #[cfg(any(feature = "ring", feature = "aws_lc_rs"))] {
/// # use rustls::RootCertStore;
/// # use rustls::server::WebPkiClientVerifier;
/// # let roots = RootCertStore::empty();
/// let client_verifier = WebPkiClientVerifier::builder(roots.into())
/// .build()
/// .unwrap();
/// # }
/// ```
///
/// Or, to allow clients presenting a client certificate authenticated by a trusted CA, or
/// anonymous clients that present no client certificate:
/// ```no_run
/// # #[cfg(any(feature = "ring", feature = "aws_lc_rs"))] {
/// # use rustls::RootCertStore;
/// # use rustls::server::WebPkiClientVerifier;
/// # let roots = RootCertStore::empty();
/// let client_verifier = WebPkiClientVerifier::builder(roots.into())
/// .allow_unauthenticated()
/// .build()
/// .unwrap();
/// # }
/// ```
///
/// If you wish to disable advertising client authentication:
/// ```no_run
/// # use rustls::RootCertStore;
/// # use rustls::server::WebPkiClientVerifier;
/// # let roots = RootCertStore::empty();
/// let client_verifier = WebPkiClientVerifier::no_client_auth();
/// ```
///
/// You can also configure the client verifier to check for certificate revocation with
/// client certificate revocation lists (CRLs):
/// ```no_run
/// # #[cfg(any(feature = "ring", feature = "aws_lc_rs"))] {
/// # use rustls::RootCertStore;
/// # use rustls::server::{WebPkiClientVerifier};
/// # let roots = RootCertStore::empty();
/// # let crls = Vec::new();
/// let client_verifier = WebPkiClientVerifier::builder(roots.into())
/// .with_crls(crls)
/// .build()
/// .unwrap();
/// # }
/// ```
///
/// [^1]: <https://github.com/rustls/webpki>
#[derive(Debug)]
pub struct WebPkiClientVerifier {
roots: Arc<RootCertStore>,
root_hint_subjects: Vec<DistinguishedName>,
crls: Vec<CertRevocationList<'static>>,
revocation_check_depth: RevocationCheckDepth,
unknown_revocation_policy: UnknownStatusPolicy,
revocation_expiration_policy: ExpirationPolicy,
anonymous_policy: AnonymousClientPolicy,
supported_algs: WebPkiSupportedAlgorithms,
}
impl WebPkiClientVerifier {
/// Create a builder for the `webpki` client certificate verifier configuration using
/// the [process-default `CryptoProvider`][CryptoProvider#using-the-per-process-default-cryptoprovider].
///
/// Client certificate authentication will be offered by the server, and client certificates
/// will be verified using the trust anchors found in the provided `roots`. If you
/// wish to disable client authentication use [`WebPkiClientVerifier::no_client_auth()`] instead.
///
/// Use [`Self::builder_with_provider`] if you wish to specify an explicit provider.
///
/// For more information, see the [`ClientCertVerifierBuilder`] documentation.
pub fn builder(roots: Arc<RootCertStore>) -> ClientCertVerifierBuilder {
Self::builder_with_provider(
roots,
Arc::clone(CryptoProvider::get_default_or_install_from_crate_features()),
)
}
/// Create a builder for the `webpki` client certificate verifier configuration using
/// a specified [`CryptoProvider`].
///
/// Client certificate authentication will be offered by the server, and client certificates
/// will be verified using the trust anchors found in the provided `roots`. If you
/// wish to disable client authentication use [WebPkiClientVerifier::no_client_auth()] instead.
///
/// The cryptography used comes from the specified [`CryptoProvider`].
///
/// For more information, see the [`ClientCertVerifierBuilder`] documentation.
pub fn builder_with_provider(
roots: Arc<RootCertStore>,
provider: Arc<CryptoProvider>,
) -> ClientCertVerifierBuilder {
ClientCertVerifierBuilder::new(roots, provider.signature_verification_algorithms)
}
/// Create a new `WebPkiClientVerifier` that disables client authentication. The server will
/// not offer client authentication and anonymous clients will be accepted.
///
/// This is in contrast to using `WebPkiClientVerifier::builder().allow_unauthenticated().build()`,
/// which will produce a verifier that will offer client authentication, but not require it.
pub fn no_client_auth() -> Arc<dyn ClientCertVerifier> {
Arc::new(NoClientAuth {})
}
/// Construct a new `WebpkiClientVerifier`.
///
/// * `roots` is a list of trust anchors to use for certificate validation.
/// * `root_hint_subjects` is a list of distinguished names to use for hinting acceptable
/// certificate authority subjects to a client.
/// * `crls` is a `Vec` of owned certificate revocation lists (CRLs) to use for
/// client certificate validation.
/// * `revocation_check_depth` controls which certificates have their revocation status checked
/// when `crls` are provided.
/// * `unknown_revocation_policy` controls how certificates with an unknown revocation status
/// are handled when `crls` are provided.
/// * `anonymous_policy` controls whether client authentication is required, or if anonymous
/// clients can connect.
/// * `supported_algs` specifies which signature verification algorithms should be used.
pub(crate) fn new(
roots: Arc<RootCertStore>,
root_hint_subjects: Vec<DistinguishedName>,
crls: Vec<CertRevocationList<'static>>,
revocation_check_depth: RevocationCheckDepth,
unknown_revocation_policy: UnknownStatusPolicy,
revocation_expiration_policy: ExpirationPolicy,
anonymous_policy: AnonymousClientPolicy,
supported_algs: WebPkiSupportedAlgorithms,
) -> Self {
Self {
roots,
root_hint_subjects,
crls,
revocation_check_depth,
unknown_revocation_policy,
revocation_expiration_policy,
anonymous_policy,
supported_algs,
}
}
}
impl ClientCertVerifier for WebPkiClientVerifier {
fn offer_client_auth(&self) -> bool {
true
}
fn client_auth_mandatory(&self) -> bool {
match self.anonymous_policy {
AnonymousClientPolicy::Allow => false,
AnonymousClientPolicy::Deny => true,
}
}
fn root_hint_subjects(&self) -> &[DistinguishedName] {
&self.root_hint_subjects
}
fn verify_client_cert(
&self,
end_entity: &CertificateDer<'_>,
intermediates: &[CertificateDer<'_>],
now: UnixTime,
) -> Result<ClientCertVerified, Error> {
let cert = ParsedCertificate::try_from(end_entity)?;
let crl_refs = self.crls.iter().collect::<Vec<_>>();
let revocation = if self.crls.is_empty() {
None
} else {
Some(
webpki::RevocationOptionsBuilder::new(&crl_refs)
// Note: safe to unwrap here - new is only fallible if no CRLs are provided
// and we verify this above.
.unwrap()
.with_depth(self.revocation_check_depth)
.with_status_policy(self.unknown_revocation_policy)
.with_expiration_policy(self.revocation_expiration_policy)
.build(),
)
};
cert.0
.verify_for_usage(
self.supported_algs.all,
&self.roots.roots,
intermediates,
now,
webpki::KeyUsage::client_auth(),
revocation,
None,
)
.map_err(pki_error)
.map(|_| ClientCertVerified::assertion())
}
fn verify_tls12_signature(
&self,
message: &[u8],
cert: &CertificateDer<'_>,
dss: &DigitallySignedStruct,
) -> Result<HandshakeSignatureValid, Error> {
verify_tls12_signature(message, cert, dss, &self.supported_algs)
}
fn verify_tls13_signature(
&self,
message: &[u8],
cert: &CertificateDer<'_>,
dss: &DigitallySignedStruct,
) -> Result<HandshakeSignatureValid, Error> {
verify_tls13_signature(message, cert, dss, &self.supported_algs)
}
fn supported_verify_schemes(&self) -> Vec<SignatureScheme> {
self.supported_algs.supported_schemes()
}
}
/// Controls how the [WebPkiClientVerifier] handles anonymous clients.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub(crate) enum AnonymousClientPolicy {
/// Clients that do not present a client certificate are allowed.
Allow,
/// Clients that do not present a client certificate are denied.
Deny,
}
test_for_each_provider! {
use super::WebPkiClientVerifier;
use crate::server::VerifierBuilderError;
use crate::RootCertStore;
use pki_types::{CertificateDer, CertificateRevocationListDer};
use std::prelude::v1::*;
use std::sync::Arc;
use std::{vec, format, println};
fn load_crls(crls_der: &[&[u8]]) -> Vec<CertificateRevocationListDer<'static>> {
crls_der
.iter()
.map(|pem_bytes| {
rustls_pemfile::crls(&mut &pem_bytes[..])
.next()
.unwrap()
.unwrap()
})
.collect()
}
fn test_crls() -> Vec<CertificateRevocationListDer<'static>> {
load_crls(&[
include_bytes!("../../../test-ca/ecdsa-p256/client.revoked.crl.pem").as_slice(),
include_bytes!("../../../test-ca/rsa-2048/client.revoked.crl.pem").as_slice(),
])
}
fn load_roots(roots_der: &[&[u8]]) -> Arc<RootCertStore> {
let mut roots = RootCertStore::empty();
roots_der.iter().for_each(|der| {
roots
.add(CertificateDer::from(der.to_vec()))
.unwrap()
});
roots.into()
}
fn test_roots() -> Arc<RootCertStore> {
load_roots(&[
include_bytes!("../../../test-ca/ecdsa-p256/ca.der").as_slice(),
include_bytes!("../../../test-ca/rsa-2048/ca.der").as_slice(),
])
}
#[test]
fn test_client_verifier_no_auth() {
// We should be able to build a verifier that turns off client authentication.
WebPkiClientVerifier::no_client_auth();
}
#[test]
fn test_client_verifier_required_auth() {
// We should be able to build a verifier that requires client authentication, and does
// no revocation checking.
let builder = WebPkiClientVerifier::builder_with_provider(
test_roots(),
provider::default_provider().into(),
);
// The builder should be Debug.
println!("{:?}", builder);
builder.build().unwrap();
}
#[test]
fn test_client_verifier_optional_auth() {
// We should be able to build a verifier that allows client authentication, and anonymous
// access, and does no revocation checking.
let builder = WebPkiClientVerifier::builder_with_provider(
test_roots(),
provider::default_provider().into(),
)
.allow_unauthenticated();
// The builder should be Debug.
println!("{:?}", builder);
builder.build().unwrap();
}
#[test]
fn test_client_verifier_without_crls_required_auth() {
// We should be able to build a verifier that requires client authentication, and does
// no revocation checking, that hasn't been configured to determine how to handle
// unauthenticated clients yet.
let builder = WebPkiClientVerifier::builder_with_provider(
test_roots(),
provider::default_provider().into(),
);
// The builder should be Debug.
println!("{:?}", builder);
builder.build().unwrap();
}
#[test]
fn test_client_verifier_without_crls_opptional_auth() {
// We should be able to build a verifier that allows client authentication,
// and anonymous access, that does no revocation checking.
let builder = WebPkiClientVerifier::builder_with_provider(
test_roots(),
provider::default_provider().into(),
)
.allow_unauthenticated();
// The builder should be Debug.
println!("{:?}", builder);
builder.build().unwrap();
}
#[test]
fn test_with_invalid_crls() {
// Trying to build a client verifier with invalid CRLs should error at build time.
let result = WebPkiClientVerifier::builder_with_provider(
test_roots(),
provider::default_provider().into(),
)
.with_crls(vec![CertificateRevocationListDer::from(vec![0xFF])])
.build();
assert!(matches!(result, Err(VerifierBuilderError::InvalidCrl(_))));
}
#[test]
fn test_with_crls_multiple_calls() {
// We should be able to call `with_crls` on a client verifier multiple times.
let initial_crls = test_crls();
let extra_crls =
load_crls(&[
include_bytes!("../../../test-ca/eddsa/client.revoked.crl.pem").as_slice(),
]);
let builder = WebPkiClientVerifier::builder_with_provider(
test_roots(),
provider::default_provider().into(),
)
.with_crls(initial_crls.clone())
.with_crls(extra_crls.clone());
// There should be the expected number of crls.
assert_eq!(builder.crls.len(), initial_crls.len() + extra_crls.len());
// The builder should be Debug.
println!("{:?}", builder);
builder.build().unwrap();
}
#[test]
fn test_client_verifier_with_crls_required_auth_implicit() {
// We should be able to build a verifier that requires client authentication, and that does
// revocation checking with CRLs, and that does not allow any anonymous access.
let builder = WebPkiClientVerifier::builder_with_provider(
test_roots(),
provider::default_provider().into(),
)
.with_crls(test_crls());
// The builder should be Debug.
println!("{:?}", builder);
builder.build().unwrap();
}
#[test]
fn test_client_verifier_with_crls_optional_auth() {
// We should be able to build a verifier that supports client authentication, that does
// revocation checking with CRLs, and that allows anonymous access.
let builder = WebPkiClientVerifier::builder_with_provider(
test_roots(),
provider::default_provider().into(),
)
.with_crls(test_crls())
.allow_unauthenticated();
// The builder should be Debug.
println!("{:?}", builder);
builder.build().unwrap();
}
#[test]
fn test_client_verifier_ee_only() {
// We should be able to build a client verifier that only checks EE revocation status.
let builder = WebPkiClientVerifier::builder_with_provider(
test_roots(),
provider::default_provider().into(),
)
.with_crls(test_crls())
.only_check_end_entity_revocation();
// The builder should be Debug.
println!("{:?}", builder);
builder.build().unwrap();
}
#[test]
fn test_client_verifier_allow_unknown() {
// We should be able to build a client verifier that allows unknown revocation status
let builder = WebPkiClientVerifier::builder_with_provider(
test_roots(),
provider::default_provider().into(),
)
.with_crls(test_crls())
.allow_unknown_revocation_status();
// The builder should be Debug.
println!("{:?}", builder);
builder.build().unwrap();
}
#[test]
fn test_client_verifier_enforce_expiration() {
// We should be able to build a client verifier that allows unknown revocation status
let builder = WebPkiClientVerifier::builder_with_provider(
test_roots(),
provider::default_provider().into(),
)
.with_crls(test_crls())
.enforce_revocation_expiration();
// The builder should be Debug.
println!("{:?}", builder);
builder.build().unwrap();
}
#[test]
fn test_builder_no_roots() {
// Trying to create a client verifier builder with no trust anchors should fail at build time
let result = WebPkiClientVerifier::builder_with_provider(
RootCertStore::empty().into(),
provider::default_provider().into(),
)
.build();
assert!(matches!(result, Err(VerifierBuilderError::NoRootAnchors)));
}
#[test]
fn smoke() {
let all = vec![
VerifierBuilderError::NoRootAnchors,
VerifierBuilderError::InvalidCrl(crate::CertRevocationListError::ParseError),
];
for err in all {
let _ = format!("{:?}", err);
let _ = format!("{}", err);
}
}
}