1 // Copyright 2013 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.
4
5 #include "net/quic/crypto/proof_verifier_chromium.h"
6
7 #include "base/bind.h"
8 #include "base/bind_helpers.h"
9 #include "base/callback_helpers.h"
10 #include "base/compiler_specific.h"
11 #include "base/logging.h"
12 #include "base/strings/stringprintf.h"
13 #include "crypto/signature_verifier.h"
14 #include "net/base/net_errors.h"
15 #include "net/base/net_log.h"
16 #include "net/cert/asn1_util.h"
17 #include "net/cert/cert_status_flags.h"
18 #include "net/cert/cert_verifier.h"
19 #include "net/cert/cert_verify_result.h"
20 #include "net/cert/single_request_cert_verifier.h"
21 #include "net/cert/x509_certificate.h"
22 #include "net/cert/x509_util.h"
23 #include "net/quic/crypto/crypto_protocol.h"
24 #include "net/ssl/ssl_config_service.h"
25
26 using base::StringPiece;
27 using base::StringPrintf;
28 using std::string;
29 using std::vector;
30
31 namespace net {
32
ProofVerifierChromium(CertVerifier * cert_verifier,const BoundNetLog & net_log)33 ProofVerifierChromium::ProofVerifierChromium(CertVerifier* cert_verifier,
34 const BoundNetLog& net_log)
35 : cert_verifier_(cert_verifier),
36 next_state_(STATE_NONE),
37 net_log_(net_log) {
38 }
39
~ProofVerifierChromium()40 ProofVerifierChromium::~ProofVerifierChromium() {
41 verifier_.reset();
42 }
43
VerifyProof(const string & hostname,const string & server_config,const vector<string> & certs,const string & signature,std::string * error_details,scoped_ptr<ProofVerifyDetails> * details,ProofVerifierCallback * callback)44 ProofVerifierChromium::Status ProofVerifierChromium::VerifyProof(
45 const string& hostname,
46 const string& server_config,
47 const vector<string>& certs,
48 const string& signature,
49 std::string* error_details,
50 scoped_ptr<ProofVerifyDetails>* details,
51 ProofVerifierCallback* callback) {
52 DCHECK(error_details);
53 DCHECK(details);
54 DCHECK(callback);
55
56 callback_.reset(callback);
57 error_details->clear();
58
59 DCHECK_EQ(STATE_NONE, next_state_);
60 if (STATE_NONE != next_state_) {
61 *error_details = "Certificate is already set and VerifyProof has begun";
62 DLOG(WARNING) << *error_details;
63 return FAILURE;
64 }
65
66 verify_details_.reset(new ProofVerifyDetailsChromium);
67
68 if (certs.empty()) {
69 *error_details = "Failed to create certificate chain. Certs are empty.";
70 DLOG(WARNING) << *error_details;
71 verify_details_->cert_verify_result.cert_status = CERT_STATUS_INVALID;
72 details->reset(verify_details_.release());
73 return FAILURE;
74 }
75
76 // Convert certs to X509Certificate.
77 vector<StringPiece> cert_pieces(certs.size());
78 for (unsigned i = 0; i < certs.size(); i++) {
79 cert_pieces[i] = base::StringPiece(certs[i]);
80 }
81 cert_ = X509Certificate::CreateFromDERCertChain(cert_pieces);
82 if (!cert_.get()) {
83 *error_details = "Failed to create certificate chain";
84 DLOG(WARNING) << *error_details;
85 verify_details_->cert_verify_result.cert_status = CERT_STATUS_INVALID;
86 details->reset(verify_details_.release());
87 return FAILURE;
88 }
89
90 // We call VerifySignature first to avoid copying of server_config and
91 // signature.
92 if (!VerifySignature(server_config, signature, certs[0])) {
93 *error_details = "Failed to verify signature of server config";
94 DLOG(WARNING) << *error_details;
95 verify_details_->cert_verify_result.cert_status = CERT_STATUS_INVALID;
96 details->reset(verify_details_.release());
97 return FAILURE;
98 }
99
100 hostname_ = hostname;
101
102 next_state_ = STATE_VERIFY_CERT;
103 switch (DoLoop(OK)) {
104 case OK:
105 details->reset(verify_details_.release());
106 return SUCCESS;
107 case ERR_IO_PENDING:
108 return PENDING;
109 default:
110 *error_details = error_details_;
111 details->reset(verify_details_.release());
112 return FAILURE;
113 }
114 }
115
DoLoop(int last_result)116 int ProofVerifierChromium::DoLoop(int last_result) {
117 int rv = last_result;
118 do {
119 State state = next_state_;
120 next_state_ = STATE_NONE;
121 switch (state) {
122 case STATE_VERIFY_CERT:
123 DCHECK(rv == OK);
124 rv = DoVerifyCert(rv);
125 break;
126 case STATE_VERIFY_CERT_COMPLETE:
127 rv = DoVerifyCertComplete(rv);
128 break;
129 case STATE_NONE:
130 default:
131 rv = ERR_UNEXPECTED;
132 LOG(DFATAL) << "unexpected state " << state;
133 break;
134 }
135 } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);
136 return rv;
137 }
138
OnIOComplete(int result)139 void ProofVerifierChromium::OnIOComplete(int result) {
140 int rv = DoLoop(result);
141 if (rv != ERR_IO_PENDING) {
142 scoped_ptr<ProofVerifyDetails> scoped_details(verify_details_.release());
143 callback_->Run(rv == OK, error_details_, &scoped_details);
144 callback_.reset();
145 }
146 }
147
DoVerifyCert(int result)148 int ProofVerifierChromium::DoVerifyCert(int result) {
149 next_state_ = STATE_VERIFY_CERT_COMPLETE;
150
151 int flags = 0;
152 verifier_.reset(new SingleRequestCertVerifier(cert_verifier_));
153 return verifier_->Verify(
154 cert_.get(),
155 hostname_,
156 flags,
157 SSLConfigService::GetCRLSet().get(),
158 &verify_details_->cert_verify_result,
159 base::Bind(&ProofVerifierChromium::OnIOComplete,
160 base::Unretained(this)),
161 net_log_);
162 }
163
DoVerifyCertComplete(int result)164 int ProofVerifierChromium::DoVerifyCertComplete(int result) {
165 verifier_.reset();
166
167 if (result <= ERR_FAILED) {
168 error_details_ = StringPrintf("Failed to verify certificate chain: %s",
169 ErrorToString(result));
170 DLOG(WARNING) << error_details_;
171 result = ERR_FAILED;
172 }
173
174 // Exit DoLoop and return the result to the caller to VerifyProof.
175 DCHECK_EQ(STATE_NONE, next_state_);
176 return result;
177 }
178
VerifySignature(const string & signed_data,const string & signature,const string & cert)179 bool ProofVerifierChromium::VerifySignature(const string& signed_data,
180 const string& signature,
181 const string& cert) {
182 StringPiece spki;
183 if (!asn1::ExtractSPKIFromDERCert(cert, &spki)) {
184 DLOG(WARNING) << "ExtractSPKIFromDERCert failed";
185 return false;
186 }
187
188 crypto::SignatureVerifier verifier;
189
190 size_t size_bits;
191 X509Certificate::PublicKeyType type;
192 X509Certificate::GetPublicKeyInfo(cert_->os_cert_handle(), &size_bits,
193 &type);
194 if (type == X509Certificate::kPublicKeyTypeRSA) {
195 crypto::SignatureVerifier::HashAlgorithm hash_alg =
196 crypto::SignatureVerifier::SHA256;
197 crypto::SignatureVerifier::HashAlgorithm mask_hash_alg = hash_alg;
198 unsigned int hash_len = 32; // 32 is the length of a SHA-256 hash.
199
200 bool ok = verifier.VerifyInitRSAPSS(
201 hash_alg, mask_hash_alg, hash_len,
202 reinterpret_cast<const uint8*>(signature.data()), signature.size(),
203 reinterpret_cast<const uint8*>(spki.data()), spki.size());
204 if (!ok) {
205 DLOG(WARNING) << "VerifyInitRSAPSS failed";
206 return false;
207 }
208 } else if (type == X509Certificate::kPublicKeyTypeECDSA) {
209 // This is the algorithm ID for ECDSA with SHA-256. Parameters are ABSENT.
210 // RFC 5758:
211 // ecdsa-with-SHA256 OBJECT IDENTIFIER ::= { iso(1) member-body(2)
212 // us(840) ansi-X9-62(10045) signatures(4) ecdsa-with-SHA2(3) 2 }
213 // ...
214 // When the ecdsa-with-SHA224, ecdsa-with-SHA256, ecdsa-with-SHA384, or
215 // ecdsa-with-SHA512 algorithm identifier appears in the algorithm field
216 // as an AlgorithmIdentifier, the encoding MUST omit the parameters
217 // field. That is, the AlgorithmIdentifier SHALL be a SEQUENCE of one
218 // component, the OID ecdsa-with-SHA224, ecdsa-with-SHA256, ecdsa-with-
219 // SHA384, or ecdsa-with-SHA512.
220 // See also RFC 5480, Appendix A.
221 static const uint8 kECDSAWithSHA256AlgorithmID[] = {
222 0x30, 0x0a,
223 0x06, 0x08,
224 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x04, 0x03, 0x02,
225 };
226
227 if (!verifier.VerifyInit(
228 kECDSAWithSHA256AlgorithmID, sizeof(kECDSAWithSHA256AlgorithmID),
229 reinterpret_cast<const uint8*>(signature.data()),
230 signature.size(),
231 reinterpret_cast<const uint8*>(spki.data()),
232 spki.size())) {
233 DLOG(WARNING) << "VerifyInit failed";
234 return false;
235 }
236 } else {
237 LOG(ERROR) << "Unsupported public key type " << type;
238 return false;
239 }
240
241 verifier.VerifyUpdate(reinterpret_cast<const uint8*>(kProofSignatureLabel),
242 sizeof(kProofSignatureLabel));
243 verifier.VerifyUpdate(reinterpret_cast<const uint8*>(signed_data.data()),
244 signed_data.size());
245
246 if (!verifier.VerifyFinal()) {
247 DLOG(WARNING) << "VerifyFinal failed";
248 return false;
249 }
250
251 DVLOG(1) << "VerifyFinal success";
252 return true;
253 }
254
255 } // namespace net
256