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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #include "net/base/keygen_handler.h" | 5 #include "net/base/keygen_handler.h" |
| 6 | 6 |
| 7 #include <windows.h> | 7 #include <windows.h> |
| 8 #include <wincrypt.h> | 8 #include <wincrypt.h> |
| 9 #pragma comment(lib, "crypt32.lib") | 9 #pragma comment(lib, "crypt32.lib") |
| 10 #include <rpc.h> | 10 #include <rpc.h> |
| 11 #pragma comment(lib, "rpcrt4.lib") | 11 #pragma comment(lib, "rpcrt4.lib") |
| 12 | 12 |
| 13 #include <list> | 13 #include <list> |
| 14 #include <string> | 14 #include <string> |
| 15 #include <vector> | 15 #include <vector> |
| 16 | 16 |
| 17 #include "base/base64.h" | 17 #include "base/base64.h" |
| 18 #include "base/basictypes.h" | 18 #include "base/basictypes.h" |
| 19 #include "base/logging.h" | 19 #include "base/logging.h" |
| 20 #include "base/strings/string_piece.h" | 20 #include "base/strings/string_piece.h" |
| 21 #include "base/strings/string_util.h" | 21 #include "base/strings/string_util.h" |
| 22 #include "base/strings/utf_string_conversions.h" | 22 #include "base/strings/utf_string_conversions.h" |
| 23 #include "crypto/capi_util.h" | 23 #include "crypto/capi_util.h" |
| 24 #include "crypto/scoped_capi_types.h" | 24 #include "crypto/scoped_capi_types.h" |
| 25 | 25 |
| 26 | |
| 27 namespace net { | 26 namespace net { |
| 28 | 27 |
| 29 // Assigns the contents of a CERT_PUBLIC_KEY_INFO structure for the signing | 28 // Assigns the contents of a CERT_PUBLIC_KEY_INFO structure for the signing |
| 30 // key in |prov| to |output|. Returns true if encoding was successful. | 29 // key in |prov| to |output|. Returns true if encoding was successful. |
| 31 bool GetSubjectPublicKeyInfo(HCRYPTPROV prov, std::vector<BYTE>* output) { | 30 bool GetSubjectPublicKeyInfo(HCRYPTPROV prov, std::vector<BYTE>* output) { |
| 32 BOOL ok; | 31 BOOL ok; |
| 33 DWORD size = 0; | 32 DWORD size = 0; |
| 34 | 33 |
| 35 // From the private key stored in HCRYPTPROV, obtain the public key, stored | 34 // From the private key stored in HCRYPTPROV, obtain the public key, stored |
| 36 // as a CERT_PUBLIC_KEY_INFO structure. Currently, only RSA public keys are | 35 // as a CERT_PUBLIC_KEY_INFO structure. Currently, only RSA public keys are |
| 37 // supported. | 36 // supported. |
| 38 ok = CryptExportPublicKeyInfoEx(prov, AT_KEYEXCHANGE, X509_ASN_ENCODING, | 37 ok = CryptExportPublicKeyInfoEx(prov, |
| 39 const_cast<char*>(szOID_RSA_RSA), 0, NULL, | 38 AT_KEYEXCHANGE, |
| 40 NULL, &size); | 39 X509_ASN_ENCODING, |
| 40 const_cast<char*>(szOID_RSA_RSA), |
| 41 0, |
| 42 NULL, |
| 43 NULL, |
| 44 &size); |
| 41 DCHECK(ok); | 45 DCHECK(ok); |
| 42 if (!ok) | 46 if (!ok) |
| 43 return false; | 47 return false; |
| 44 | 48 |
| 45 output->resize(size); | 49 output->resize(size); |
| 46 | 50 |
| 47 PCERT_PUBLIC_KEY_INFO public_key_casted = | 51 PCERT_PUBLIC_KEY_INFO public_key_casted = |
| 48 reinterpret_cast<PCERT_PUBLIC_KEY_INFO>(&(*output)[0]); | 52 reinterpret_cast<PCERT_PUBLIC_KEY_INFO>(&(*output)[0]); |
| 49 ok = CryptExportPublicKeyInfoEx(prov, AT_KEYEXCHANGE, X509_ASN_ENCODING, | 53 ok = CryptExportPublicKeyInfoEx(prov, |
| 50 const_cast<char*>(szOID_RSA_RSA), 0, NULL, | 54 AT_KEYEXCHANGE, |
| 51 public_key_casted, &size); | 55 X509_ASN_ENCODING, |
| 56 const_cast<char*>(szOID_RSA_RSA), |
| 57 0, |
| 58 NULL, |
| 59 public_key_casted, |
| 60 &size); |
| 52 DCHECK(ok); | 61 DCHECK(ok); |
| 53 if (!ok) | 62 if (!ok) |
| 54 return false; | 63 return false; |
| 55 | 64 |
| 56 output->resize(size); | 65 output->resize(size); |
| 57 | 66 |
| 58 return true; | 67 return true; |
| 59 } | 68 } |
| 60 | 69 |
| 61 // Generates a DER encoded SignedPublicKeyAndChallenge structure from the | 70 // Generates a DER encoded SignedPublicKeyAndChallenge structure from the |
| (...skipping 19 matching lines...) Expand all Loading... |
| 81 *reinterpret_cast<PCERT_PUBLIC_KEY_INFO>(&spki[0]); | 90 *reinterpret_cast<PCERT_PUBLIC_KEY_INFO>(&spki[0]); |
| 82 pkac.pwszChallengeString = const_cast<wchar_t*>(wide_challenge.c_str()); | 91 pkac.pwszChallengeString = const_cast<wchar_t*>(wide_challenge.c_str()); |
| 83 | 92 |
| 84 CRYPT_ALGORITHM_IDENTIFIER sig_alg; | 93 CRYPT_ALGORITHM_IDENTIFIER sig_alg; |
| 85 memset(&sig_alg, 0, sizeof(sig_alg)); | 94 memset(&sig_alg, 0, sizeof(sig_alg)); |
| 86 sig_alg.pszObjId = const_cast<char*>(szOID_RSA_MD5RSA); | 95 sig_alg.pszObjId = const_cast<char*>(szOID_RSA_MD5RSA); |
| 87 | 96 |
| 88 BOOL ok; | 97 BOOL ok; |
| 89 DWORD size = 0; | 98 DWORD size = 0; |
| 90 std::vector<BYTE> signed_pkac; | 99 std::vector<BYTE> signed_pkac; |
| 91 ok = CryptSignAndEncodeCertificate(prov, AT_KEYEXCHANGE, X509_ASN_ENCODING, | 100 ok = CryptSignAndEncodeCertificate(prov, |
| 101 AT_KEYEXCHANGE, |
| 102 X509_ASN_ENCODING, |
| 92 X509_KEYGEN_REQUEST_TO_BE_SIGNED, | 103 X509_KEYGEN_REQUEST_TO_BE_SIGNED, |
| 93 &pkac, &sig_alg, NULL, | 104 &pkac, |
| 94 NULL, &size); | 105 &sig_alg, |
| 106 NULL, |
| 107 NULL, |
| 108 &size); |
| 95 DCHECK(ok); | 109 DCHECK(ok); |
| 96 if (!ok) | 110 if (!ok) |
| 97 return false; | 111 return false; |
| 98 | 112 |
| 99 signed_pkac.resize(size); | 113 signed_pkac.resize(size); |
| 100 ok = CryptSignAndEncodeCertificate(prov, AT_KEYEXCHANGE, X509_ASN_ENCODING, | 114 ok = CryptSignAndEncodeCertificate(prov, |
| 115 AT_KEYEXCHANGE, |
| 116 X509_ASN_ENCODING, |
| 101 X509_KEYGEN_REQUEST_TO_BE_SIGNED, | 117 X509_KEYGEN_REQUEST_TO_BE_SIGNED, |
| 102 &pkac, &sig_alg, NULL, | 118 &pkac, |
| 103 &signed_pkac[0], &size); | 119 &sig_alg, |
| 120 NULL, |
| 121 &signed_pkac[0], |
| 122 &size); |
| 104 DCHECK(ok); | 123 DCHECK(ok); |
| 105 if (!ok) | 124 if (!ok) |
| 106 return false; | 125 return false; |
| 107 | 126 |
| 108 output->assign(reinterpret_cast<char*>(&signed_pkac[0]), size); | 127 output->assign(reinterpret_cast<char*>(&signed_pkac[0]), size); |
| 109 return true; | 128 return true; |
| 110 } | 129 } |
| 111 | 130 |
| 112 // Generates a unique name for the container which will store the key that is | 131 // Generates a unique name for the container which will store the key that is |
| 113 // generated. The traditional Windows approach is to use a GUID here. | 132 // generated. The traditional Windows approach is to use a GUID here. |
| 114 std::wstring GetNewKeyContainerId() { | 133 std::wstring GetNewKeyContainerId() { |
| 115 RPC_STATUS status = RPC_S_OK; | 134 RPC_STATUS status = RPC_S_OK; |
| 116 std::wstring result; | 135 std::wstring result; |
| 117 | 136 |
| 118 UUID id = { 0 }; | 137 UUID id = {0}; |
| 119 status = UuidCreateSequential(&id); | 138 status = UuidCreateSequential(&id); |
| 120 if (status != RPC_S_OK && status != RPC_S_UUID_LOCAL_ONLY) | 139 if (status != RPC_S_OK && status != RPC_S_UUID_LOCAL_ONLY) |
| 121 return result; | 140 return result; |
| 122 | 141 |
| 123 RPC_WSTR rpc_string = NULL; | 142 RPC_WSTR rpc_string = NULL; |
| 124 status = UuidToString(&id, &rpc_string); | 143 status = UuidToString(&id, &rpc_string); |
| 125 if (status != RPC_S_OK) | 144 if (status != RPC_S_OK) |
| 126 return result; | 145 return result; |
| 127 | 146 |
| 128 // RPC_WSTR is unsigned short*. wchar_t is a built-in type of Visual C++, | 147 // RPC_WSTR is unsigned short*. wchar_t is a built-in type of Visual C++, |
| 129 // so the type cast is necessary. | 148 // so the type cast is necessary. |
| 130 result.assign(reinterpret_cast<wchar_t*>(rpc_string)); | 149 result.assign(reinterpret_cast<wchar_t*>(rpc_string)); |
| 131 RpcStringFree(&rpc_string); | 150 RpcStringFree(&rpc_string); |
| 132 | 151 |
| 133 return result; | 152 return result; |
| 134 } | 153 } |
| 135 | 154 |
| 136 // This is a helper struct designed to optionally delete a key after releasing | 155 // This is a helper struct designed to optionally delete a key after releasing |
| 137 // the associated provider. | 156 // the associated provider. |
| 138 struct KeyContainer { | 157 struct KeyContainer { |
| 139 public: | 158 public: |
| 140 explicit KeyContainer(bool delete_keyset) | 159 explicit KeyContainer(bool delete_keyset) : delete_keyset_(delete_keyset) {} |
| 141 : delete_keyset_(delete_keyset) {} | |
| 142 | 160 |
| 143 ~KeyContainer() { | 161 ~KeyContainer() { |
| 144 if (provider_) { | 162 if (provider_) { |
| 145 provider_.reset(); | 163 provider_.reset(); |
| 146 if (delete_keyset_ && !key_id_.empty()) { | 164 if (delete_keyset_ && !key_id_.empty()) { |
| 147 HCRYPTPROV provider; | 165 HCRYPTPROV provider; |
| 148 crypto::CryptAcquireContextLocked(&provider, key_id_.c_str(), NULL, | 166 crypto::CryptAcquireContextLocked(&provider, |
| 149 PROV_RSA_FULL, CRYPT_SILENT | CRYPT_DELETEKEYSET); | 167 key_id_.c_str(), |
| 168 NULL, |
| 169 PROV_RSA_FULL, |
| 170 CRYPT_SILENT | CRYPT_DELETEKEYSET); |
| 150 } | 171 } |
| 151 } | 172 } |
| 152 } | 173 } |
| 153 | 174 |
| 154 crypto::ScopedHCRYPTPROV provider_; | 175 crypto::ScopedHCRYPTPROV provider_; |
| 155 std::wstring key_id_; | 176 std::wstring key_id_; |
| 156 | 177 |
| 157 private: | 178 private: |
| 158 bool delete_keyset_; | 179 bool delete_keyset_; |
| 159 }; | 180 }; |
| (...skipping 12 matching lines...) Expand all Loading... |
| 172 // creating their own keys, they should ensure unique naming schemes to | 193 // creating their own keys, they should ensure unique naming schemes to |
| 173 // prevent overlap with any other applications or consumers of CSPs, and | 194 // prevent overlap with any other applications or consumers of CSPs, and |
| 174 // *should not* store new keys within the default, NULL key container. | 195 // *should not* store new keys within the default, NULL key container. |
| 175 key_container.key_id_ = GetNewKeyContainerId(); | 196 key_container.key_id_ = GetNewKeyContainerId(); |
| 176 if (key_container.key_id_.empty()) | 197 if (key_container.key_id_.empty()) |
| 177 return std::string(); | 198 return std::string(); |
| 178 | 199 |
| 179 // Only create new key containers, so that existing key containers are not | 200 // Only create new key containers, so that existing key containers are not |
| 180 // overwritten. | 201 // overwritten. |
| 181 if (crypto::CryptAcquireContextLocked(key_container.provider_.receive(), | 202 if (crypto::CryptAcquireContextLocked(key_container.provider_.receive(), |
| 182 key_container.key_id_.c_str(), NULL, PROV_RSA_FULL, | 203 key_container.key_id_.c_str(), |
| 183 CRYPT_SILENT | CRYPT_NEWKEYSET)) | 204 NULL, |
| 205 PROV_RSA_FULL, |
| 206 CRYPT_SILENT | CRYPT_NEWKEYSET)) |
| 184 break; | 207 break; |
| 185 | 208 |
| 186 if (GetLastError() != NTE_BAD_KEYSET) { | 209 if (GetLastError() != NTE_BAD_KEYSET) { |
| 187 LOG(ERROR) << "Keygen failed: Couldn't acquire a CryptoAPI provider " | 210 LOG(ERROR) << "Keygen failed: Couldn't acquire a CryptoAPI provider " |
| 188 "context: " << GetLastError(); | 211 "context: " << GetLastError(); |
| 189 return std::string(); | 212 return std::string(); |
| 190 } | 213 } |
| 191 } | 214 } |
| 192 if (attempt == kMaxAttempts) { | 215 if (attempt == kMaxAttempts) { |
| 193 LOG(ERROR) << "Keygen failed: Couldn't acquire a CryptoAPI provider " | 216 LOG(ERROR) << "Keygen failed: Couldn't acquire a CryptoAPI provider " |
| 194 "context: Max retries exceeded"; | 217 "context: Max retries exceeded"; |
| 195 return std::string(); | 218 return std::string(); |
| 196 } | 219 } |
| 197 | 220 |
| 198 { | 221 { |
| 199 crypto::ScopedHCRYPTKEY key; | 222 crypto::ScopedHCRYPTKEY key; |
| 200 if (!CryptGenKey(key_container.provider_, CALG_RSA_KEYX, | 223 if (!CryptGenKey(key_container.provider_, |
| 201 (key_size_in_bits_ << 16) | CRYPT_EXPORTABLE, key.receive())) { | 224 CALG_RSA_KEYX, |
| 225 (key_size_in_bits_ << 16) | CRYPT_EXPORTABLE, |
| 226 key.receive())) { |
| 202 LOG(ERROR) << "Keygen failed: Couldn't generate an RSA key"; | 227 LOG(ERROR) << "Keygen failed: Couldn't generate an RSA key"; |
| 203 return std::string(); | 228 return std::string(); |
| 204 } | 229 } |
| 205 | 230 |
| 206 std::string spkac; | 231 std::string spkac; |
| 207 if (!GetSignedPublicKeyAndChallenge(key_container.provider_, challenge_, | 232 if (!GetSignedPublicKeyAndChallenge( |
| 208 &spkac)) { | 233 key_container.provider_, challenge_, &spkac)) { |
| 209 LOG(ERROR) << "Keygen failed: Couldn't generate the signed public key " | 234 LOG(ERROR) << "Keygen failed: Couldn't generate the signed public key " |
| 210 "and challenge"; | 235 "and challenge"; |
| 211 return std::string(); | 236 return std::string(); |
| 212 } | 237 } |
| 213 | 238 |
| 214 std::string result; | 239 std::string result; |
| 215 base::Base64Encode(spkac, &result); | 240 base::Base64Encode(spkac, &result); |
| 216 | 241 |
| 217 VLOG(1) << "Keygen succeeded"; | 242 VLOG(1) << "Keygen succeeded"; |
| 218 return result; | 243 return result; |
| 219 } | 244 } |
| 220 } | 245 } |
| 221 | 246 |
| 222 } // namespace net | 247 } // namespace net |
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