1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "net/cert/cert_verify_proc_openssl.h"
7 #include <openssl/x509v3.h>
12 #include "base/logging.h"
13 #include "base/sha1.h"
14 #include "crypto/openssl_util.h"
15 #include "crypto/sha2.h"
16 #include "net/base/net_errors.h"
17 #include "net/cert/asn1_util.h"
18 #include "net/cert/cert_status_flags.h"
19 #include "net/cert/cert_verifier.h"
20 #include "net/cert/cert_verify_result.h"
21 #include "net/cert/x509_certificate.h"
27 // Maps X509_STORE_CTX_get_error() return values to our cert status flags.
28 CertStatus MapCertErrorToCertStatus(int err) {
30 case X509_V_ERR_SUBJECT_ISSUER_MISMATCH:
31 return CERT_STATUS_COMMON_NAME_INVALID;
32 case X509_V_ERR_CERT_NOT_YET_VALID:
33 case X509_V_ERR_CERT_HAS_EXPIRED:
34 case X509_V_ERR_CRL_NOT_YET_VALID:
35 case X509_V_ERR_CRL_HAS_EXPIRED:
36 case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
37 case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
38 case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
39 case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
40 return CERT_STATUS_DATE_INVALID;
41 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
42 case X509_V_ERR_UNABLE_TO_GET_CRL:
43 case X509_V_ERR_INVALID_CA:
44 case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
45 case X509_V_ERR_INVALID_NON_CA:
46 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
47 case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
48 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
49 return CERT_STATUS_AUTHORITY_INVALID;
51 // TODO(bulach): what should we map to these status?
52 return CERT_STATUS_NO_REVOCATION_MECHANISM;
53 return CERT_STATUS_UNABLE_TO_CHECK_REVOCATION;
55 case X509_V_ERR_CERT_REVOKED:
56 return CERT_STATUS_REVOKED;
57 // All these status are mapped to CERT_STATUS_INVALID.
58 case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
59 case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
60 case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
61 case X509_V_ERR_CERT_SIGNATURE_FAILURE:
62 case X509_V_ERR_CRL_SIGNATURE_FAILURE:
63 case X509_V_ERR_OUT_OF_MEM:
64 case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
65 case X509_V_ERR_CERT_CHAIN_TOO_LONG:
66 case X509_V_ERR_PATH_LENGTH_EXCEEDED:
67 case X509_V_ERR_INVALID_PURPOSE:
68 case X509_V_ERR_CERT_UNTRUSTED:
69 case X509_V_ERR_CERT_REJECTED:
70 case X509_V_ERR_AKID_SKID_MISMATCH:
71 case X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH:
72 case X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION:
73 case X509_V_ERR_KEYUSAGE_NO_CERTSIGN:
74 case X509_V_ERR_KEYUSAGE_NO_CRL_SIGN:
75 case X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION:
76 case X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED:
77 case X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE:
78 case X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED:
79 case X509_V_ERR_INVALID_EXTENSION:
80 case X509_V_ERR_INVALID_POLICY_EXTENSION:
81 case X509_V_ERR_NO_EXPLICIT_POLICY:
82 case X509_V_ERR_UNNESTED_RESOURCE:
83 case X509_V_ERR_APPLICATION_VERIFICATION:
84 return CERT_STATUS_INVALID;
86 NOTREACHED() << "Invalid X509 err " << err;
87 return CERT_STATUS_INVALID;
91 // sk_X509_free is a function-style macro, so can't be used as a template
93 void sk_X509_free_fn(STACK_OF(X509)* st) {
97 void GetCertChainInfo(X509_STORE_CTX* store_ctx,
98 CertVerifyResult* verify_result) {
99 STACK_OF(X509)* chain = X509_STORE_CTX_get_chain(store_ctx);
100 X509* verified_cert = NULL;
101 std::vector<X509*> verified_chain;
102 for (int i = 0; i < sk_X509_num(chain); ++i) {
103 X509* cert = sk_X509_value(chain, i);
105 verified_cert = cert;
107 verified_chain.push_back(cert);
110 // Only check the algorithm status for certificates that are not in the
112 if (i < store_ctx->last_untrusted) {
113 int sig_alg = OBJ_obj2nid(cert->sig_alg->algorithm);
114 if (sig_alg == NID_md2WithRSAEncryption) {
115 verify_result->has_md2 = true;
116 } else if (sig_alg == NID_md4WithRSAEncryption) {
117 verify_result->has_md4 = true;
118 } else if (sig_alg == NID_md5WithRSAEncryption) {
119 verify_result->has_md5 = true;
125 verify_result->verified_cert =
126 X509Certificate::CreateFromHandle(verified_cert, verified_chain);
130 void AppendPublicKeyHashes(X509_STORE_CTX* store_ctx,
131 HashValueVector* hashes) {
132 STACK_OF(X509)* chain = X509_STORE_CTX_get_chain(store_ctx);
133 for (int i = 0; i < sk_X509_num(chain); ++i) {
134 X509* cert = sk_X509_value(chain, i);
136 std::string der_data;
137 if (!X509Certificate::GetDEREncoded(cert, &der_data))
140 base::StringPiece der_bytes(der_data);
141 base::StringPiece spki_bytes;
142 if (!asn1::ExtractSPKIFromDERCert(der_bytes, &spki_bytes))
145 HashValue sha1(HASH_VALUE_SHA1);
146 base::SHA1HashBytes(reinterpret_cast<const uint8*>(spki_bytes.data()),
147 spki_bytes.size(), sha1.data());
148 hashes->push_back(sha1);
150 HashValue sha256(HASH_VALUE_SHA256);
151 crypto::SHA256HashString(spki_bytes, sha256.data(), crypto::kSHA256Length);
152 hashes->push_back(sha256);
158 CertVerifyProcOpenSSL::CertVerifyProcOpenSSL() {}
160 CertVerifyProcOpenSSL::~CertVerifyProcOpenSSL() {}
162 bool CertVerifyProcOpenSSL::SupportsAdditionalTrustAnchors() const {
166 int CertVerifyProcOpenSSL::VerifyInternal(
167 X509Certificate* cert,
168 const std::string& hostname,
171 const CertificateList& additional_trust_anchors,
172 CertVerifyResult* verify_result) {
173 crypto::EnsureOpenSSLInit();
175 if (!cert->VerifyNameMatch(hostname,
176 &verify_result->common_name_fallback_used)) {
177 verify_result->cert_status |= CERT_STATUS_COMMON_NAME_INVALID;
180 crypto::ScopedOpenSSL<X509_STORE_CTX, X509_STORE_CTX_free> ctx(
181 X509_STORE_CTX_new());
183 crypto::ScopedOpenSSL<STACK_OF(X509), sk_X509_free_fn> intermediates(
185 if (!intermediates.get())
186 return ERR_OUT_OF_MEMORY;
188 const X509Certificate::OSCertHandles& os_intermediates =
189 cert->GetIntermediateCertificates();
190 for (X509Certificate::OSCertHandles::const_iterator it =
191 os_intermediates.begin(); it != os_intermediates.end(); ++it) {
192 if (!sk_X509_push(intermediates.get(), *it))
193 return ERR_OUT_OF_MEMORY;
195 if (X509_STORE_CTX_init(ctx.get(), X509Certificate::cert_store(),
196 cert->os_cert_handle(), intermediates.get()) != 1) {
201 if (X509_verify_cert(ctx.get()) != 1) {
202 int x509_error = X509_STORE_CTX_get_error(ctx.get());
203 CertStatus cert_status = MapCertErrorToCertStatus(x509_error);
204 LOG(ERROR) << "X509 Verification error "
205 << X509_verify_cert_error_string(x509_error)
206 << " : " << x509_error
207 << " : " << X509_STORE_CTX_get_error_depth(ctx.get())
208 << " : " << cert_status;
209 verify_result->cert_status |= cert_status;
212 GetCertChainInfo(ctx.get(), verify_result);
213 AppendPublicKeyHashes(ctx.get(), &verify_result->public_key_hashes);
214 if (IsCertStatusError(verify_result->cert_status))
215 return MapCertStatusToNetError(verify_result->cert_status);
217 // Currently we only ues OpenSSL's default root CA paths, so treat all
218 // correctly verified certs as being from a known root.
219 // TODO(joth): if the motivations described in
220 // http://src.chromium.org/viewvc/chrome?view=rev&revision=80778 become an
221 // issue on OpenSSL builds, we will need to embed a hardcoded list of well
222 // known root CAs, as per the _mac and _win versions.
223 verify_result->is_issued_by_known_root = true;