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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/cert/cert_verify_proc_openssl.h"
#include <openssl/x509v3.h>
#include <string>
#include <vector>
#include "base/logging.h"
#include "base/sha1.h"
#include "crypto/openssl_util.h"
#include "crypto/sha2.h"
#include "net/base/net_errors.h"
#include "net/cert/asn1_util.h"
#include "net/cert/cert_status_flags.h"
#include "net/cert/cert_verifier.h"
#include "net/cert/cert_verify_result.h"
#include "net/cert/test_root_certs.h"
#include "net/cert/x509_certificate.h"
namespace net {
namespace {
// Maps X509_STORE_CTX_get_error() return values to our cert status flags.
CertStatus MapCertErrorToCertStatus(int err) {
switch (err) {
case X509_V_ERR_SUBJECT_ISSUER_MISMATCH:
return CERT_STATUS_COMMON_NAME_INVALID;
case X509_V_ERR_CERT_NOT_YET_VALID:
case X509_V_ERR_CERT_HAS_EXPIRED:
case X509_V_ERR_CRL_NOT_YET_VALID:
case X509_V_ERR_CRL_HAS_EXPIRED:
case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
return CERT_STATUS_DATE_INVALID;
case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
case X509_V_ERR_UNABLE_TO_GET_CRL:
case X509_V_ERR_INVALID_CA:
case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
case X509_V_ERR_INVALID_NON_CA:
case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
return CERT_STATUS_AUTHORITY_INVALID;
#if 0
// TODO(bulach): what should we map to these status?
return CERT_STATUS_NO_REVOCATION_MECHANISM;
return CERT_STATUS_UNABLE_TO_CHECK_REVOCATION;
#endif
case X509_V_ERR_CERT_REVOKED:
return CERT_STATUS_REVOKED;
// All these status are mapped to CERT_STATUS_INVALID.
case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
case X509_V_ERR_CERT_SIGNATURE_FAILURE:
case X509_V_ERR_CRL_SIGNATURE_FAILURE:
case X509_V_ERR_OUT_OF_MEM:
case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
case X509_V_ERR_CERT_CHAIN_TOO_LONG:
case X509_V_ERR_PATH_LENGTH_EXCEEDED:
case X509_V_ERR_INVALID_PURPOSE:
case X509_V_ERR_CERT_UNTRUSTED:
case X509_V_ERR_CERT_REJECTED:
case X509_V_ERR_AKID_SKID_MISMATCH:
case X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH:
case X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION:
case X509_V_ERR_KEYUSAGE_NO_CERTSIGN:
case X509_V_ERR_KEYUSAGE_NO_CRL_SIGN:
case X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION:
case X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED:
case X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE:
case X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED:
case X509_V_ERR_INVALID_EXTENSION:
case X509_V_ERR_INVALID_POLICY_EXTENSION:
case X509_V_ERR_NO_EXPLICIT_POLICY:
case X509_V_ERR_UNNESTED_RESOURCE:
case X509_V_ERR_APPLICATION_VERIFICATION:
return CERT_STATUS_INVALID;
default:
NOTREACHED() << "Invalid X509 err " << err;
return CERT_STATUS_INVALID;
}
}
// sk_X509_free is a function-style macro, so can't be used as a template
// param directly.
void sk_X509_free_fn(STACK_OF(X509)* st) {
sk_X509_free(st);
}
void GetCertChainInfo(X509_STORE_CTX* store_ctx,
CertVerifyResult* verify_result) {
STACK_OF(X509)* chain = X509_STORE_CTX_get_chain(store_ctx);
X509* verified_cert = NULL;
std::vector<X509*> verified_chain;
for (int i = 0; i < sk_X509_num(chain); ++i) {
X509* cert = sk_X509_value(chain, i);
if (i == 0) {
verified_cert = cert;
} else {
verified_chain.push_back(cert);
}
// Only check the algorithm status for certificates that are not in the
// trust store.
if (i < store_ctx->last_untrusted) {
int sig_alg = OBJ_obj2nid(cert->sig_alg->algorithm);
if (sig_alg == NID_md2WithRSAEncryption) {
verify_result->has_md2 = true;
} else if (sig_alg == NID_md4WithRSAEncryption) {
verify_result->has_md4 = true;
} else if (sig_alg == NID_md5WithRSAEncryption) {
verify_result->has_md5 = true;
}
}
}
// Set verify_result->verified_cert and
// verify_result->is_issued_by_known_root.
if (verified_cert) {
verify_result->verified_cert =
X509Certificate::CreateFromHandle(verified_cert, verified_chain);
// For OpenSSL builds, only certificates used for unit tests are treated
// as not issued by known roots. The only way to determine whether a
// certificate is issued by a known root using OpenSSL is to examine
// distro-and-release specific hardcoded lists.
verify_result->is_issued_by_known_root = true;
if (TestRootCerts::HasInstance()) {
X509* root = NULL;
if (verified_chain.empty()) {
root = verified_cert;
} else {
root = verified_chain.back();
}
TestRootCerts* root_certs = TestRootCerts::GetInstance();
if (root_certs->Contains(root))
verify_result->is_issued_by_known_root = false;
}
}
}
void AppendPublicKeyHashes(X509_STORE_CTX* store_ctx,
HashValueVector* hashes) {
STACK_OF(X509)* chain = X509_STORE_CTX_get_chain(store_ctx);
for (int i = 0; i < sk_X509_num(chain); ++i) {
X509* cert = sk_X509_value(chain, i);
std::string der_data;
if (!X509Certificate::GetDEREncoded(cert, &der_data))
continue;
base::StringPiece der_bytes(der_data);
base::StringPiece spki_bytes;
if (!asn1::ExtractSPKIFromDERCert(der_bytes, &spki_bytes))
continue;
HashValue sha1(HASH_VALUE_SHA1);
base::SHA1HashBytes(reinterpret_cast<const uint8*>(spki_bytes.data()),
spki_bytes.size(), sha1.data());
hashes->push_back(sha1);
HashValue sha256(HASH_VALUE_SHA256);
crypto::SHA256HashString(spki_bytes, sha256.data(), crypto::kSHA256Length);
hashes->push_back(sha256);
}
}
} // namespace
CertVerifyProcOpenSSL::CertVerifyProcOpenSSL() {}
CertVerifyProcOpenSSL::~CertVerifyProcOpenSSL() {}
bool CertVerifyProcOpenSSL::SupportsAdditionalTrustAnchors() const {
return false;
}
int CertVerifyProcOpenSSL::VerifyInternal(
X509Certificate* cert,
const std::string& hostname,
int flags,
CRLSet* crl_set,
const CertificateList& additional_trust_anchors,
CertVerifyResult* verify_result) {
crypto::EnsureOpenSSLInit();
if (!cert->VerifyNameMatch(hostname,
&verify_result->common_name_fallback_used)) {
verify_result->cert_status |= CERT_STATUS_COMMON_NAME_INVALID;
}
crypto::ScopedOpenSSL<X509_STORE_CTX, X509_STORE_CTX_free> ctx(
X509_STORE_CTX_new());
crypto::ScopedOpenSSL<STACK_OF(X509), sk_X509_free_fn> intermediates(
sk_X509_new_null());
if (!intermediates.get())
return ERR_OUT_OF_MEMORY;
const X509Certificate::OSCertHandles& os_intermediates =
cert->GetIntermediateCertificates();
for (X509Certificate::OSCertHandles::const_iterator it =
os_intermediates.begin(); it != os_intermediates.end(); ++it) {
if (!sk_X509_push(intermediates.get(), *it))
return ERR_OUT_OF_MEMORY;
}
if (X509_STORE_CTX_init(ctx.get(), X509Certificate::cert_store(),
cert->os_cert_handle(), intermediates.get()) != 1) {
NOTREACHED();
return ERR_FAILED;
}
if (X509_verify_cert(ctx.get()) != 1) {
int x509_error = X509_STORE_CTX_get_error(ctx.get());
CertStatus cert_status = MapCertErrorToCertStatus(x509_error);
LOG(ERROR) << "X509 Verification error "
<< X509_verify_cert_error_string(x509_error)
<< " : " << x509_error
<< " : " << X509_STORE_CTX_get_error_depth(ctx.get())
<< " : " << cert_status;
verify_result->cert_status |= cert_status;
}
GetCertChainInfo(ctx.get(), verify_result);
AppendPublicKeyHashes(ctx.get(), &verify_result->public_key_hashes);
if (IsCertStatusError(verify_result->cert_status))
return MapCertStatusToNetError(verify_result->cert_status);
return OK;
}
} // namespace net
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