2 * Copyright 2016 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 #include <folly/io/async/ssl/OpenSSLUtils.h>
17 #include <folly/ScopeGuard.h>
18 #include <folly/portability/Sockets.h>
19 #include <glog/logging.h>
20 #include <openssl/bio.h>
21 #include <openssl/err.h>
22 #include <openssl/rand.h>
23 #include <openssl/ssl.h>
24 #include <openssl/x509v3.h>
25 #include <unordered_map>
27 #define OPENSSL_IS_101 (OPENSSL_VERSION_NUMBER >= 0x1000105fL && \
28 OPENSSL_VERSION_NUMBER < 0x1000200fL)
29 #define OPENSSL_IS_102 (OPENSSL_VERSION_NUMBER >= 0x1000200fL && \
30 OPENSSL_VERSION_NUMBER < 0x10100000L)
31 #define OPENSSL_IS_110 (OPENSSL_VERSION_NUMBER >= 0x10100000L)
34 #if defined(OPENSSL_IS_BORINGSSL)
35 // BoringSSL doesn't (as of May 2016) export the equivalent
36 // of BIO_sock_should_retry, so this is one way around it :(
37 static int boringssl_bio_fd_should_retry(int err);
45 bool OpenSSLUtils::getTLSMasterKey(
46 const SSL_SESSION* session,
47 MutableByteRange keyOut) {
48 #if OPENSSL_IS_101 || OPENSSL_IS_102
50 session->master_key_length == static_cast<int>(keyOut.size())) {
51 auto masterKey = session->master_key;
53 masterKey, masterKey + session->master_key_length, keyOut.begin());
60 bool OpenSSLUtils::getTLSClientRandom(
62 MutableByteRange randomOut) {
63 #if OPENSSL_IS_101 || OPENSSL_IS_102
64 if ((SSL_version(ssl) >> 8) == TLS1_VERSION_MAJOR && ssl->s3 &&
65 randomOut.size() == SSL3_RANDOM_SIZE) {
66 auto clientRandom = ssl->s3->client_random;
67 std::copy(clientRandom, clientRandom + SSL3_RANDOM_SIZE, randomOut.begin());
74 bool OpenSSLUtils::getPeerAddressFromX509StoreCtx(X509_STORE_CTX* ctx,
75 sockaddr_storage* addrStorage,
77 // Grab the ssl idx and then the ssl object so that we can get the peer
78 // name to compare against the ips in the subjectAltName
79 auto sslIdx = SSL_get_ex_data_X509_STORE_CTX_idx();
80 auto ssl = reinterpret_cast<SSL*>(X509_STORE_CTX_get_ex_data(ctx, sslIdx));
81 int fd = SSL_get_fd(ssl);
83 LOG(ERROR) << "Inexplicably couldn't get fd from SSL";
87 *addrLen = sizeof(*addrStorage);
88 if (getpeername(fd, reinterpret_cast<sockaddr*>(addrStorage), addrLen) != 0) {
89 PLOG(ERROR) << "Unable to get peer name";
92 CHECK(*addrLen <= sizeof(*addrStorage));
96 bool OpenSSLUtils::validatePeerCertNames(X509* cert,
98 socklen_t /* addrLen */) {
99 // Try to extract the names within the SAN extension from the certificate
100 auto altNames = reinterpret_cast<STACK_OF(GENERAL_NAME)*>(
101 X509_get_ext_d2i(cert, NID_subject_alt_name, nullptr, nullptr));
103 if (altNames != nullptr) {
104 sk_GENERAL_NAME_pop_free(altNames, GENERAL_NAME_free);
107 if (altNames == nullptr) {
108 LOG(WARNING) << "No subjectAltName provided and we only support ip auth";
112 const sockaddr_in* addr4 = nullptr;
113 const sockaddr_in6* addr6 = nullptr;
114 if (addr != nullptr) {
115 if (addr->sa_family == AF_INET) {
116 addr4 = reinterpret_cast<const sockaddr_in*>(addr);
117 } else if (addr->sa_family == AF_INET6) {
118 addr6 = reinterpret_cast<const sockaddr_in6*>(addr);
120 LOG(FATAL) << "Unsupported sockaddr family: " << addr->sa_family;
124 for (int i = 0; i < sk_GENERAL_NAME_num(altNames); i++) {
125 auto name = sk_GENERAL_NAME_value(altNames, i);
126 if ((addr4 != nullptr || addr6 != nullptr) && name->type == GEN_IPADD) {
127 // Extra const-ness for paranoia
128 unsigned char const* const rawIpStr = name->d.iPAddress->data;
129 int const rawIpLen = name->d.iPAddress->length;
131 if (rawIpLen == 4 && addr4 != nullptr) {
132 if (::memcmp(rawIpStr, &addr4->sin_addr, rawIpLen) == 0) {
135 } else if (rawIpLen == 16 && addr6 != nullptr) {
136 if (::memcmp(rawIpStr, &addr6->sin6_addr, rawIpLen) == 0) {
139 } else if (rawIpLen != 4 && rawIpLen != 16) {
140 LOG(WARNING) << "Unexpected IP length: " << rawIpLen;
145 LOG(WARNING) << "Unable to match client cert against alt name ip";
149 static std::unordered_map<uint16_t, std::string> getOpenSSLCipherNames() {
150 std::unordered_map<uint16_t, std::string> ret;
151 SSL_CTX* ctx = nullptr;
154 const SSL_METHOD* meth = SSLv23_server_method();
155 OpenSSL_add_ssl_algorithms();
157 if ((ctx = SSL_CTX_new(meth)) == nullptr) {
164 if ((ssl = SSL_new(ctx)) == nullptr) {
171 STACK_OF(SSL_CIPHER)* sk = SSL_get_ciphers(ssl);
172 for (size_t i = 0; i < (size_t)sk_SSL_CIPHER_num(sk); i++) {
175 c = sk_SSL_CIPHER_value(sk, i);
176 unsigned long id = SSL_CIPHER_get_id(c);
177 // OpenSSL 1.0.2 and prior does weird things such as stuff the SSL/TLS
178 // version into the top 16 bits. Let's ignore those for now. This is
179 // BoringSSL compatible (their id can be cast as uint16_t)
180 uint16_t cipherCode = id & 0xffffL;
181 ret[cipherCode] = SSL_CIPHER_get_name(c);
186 const std::string& OpenSSLUtils::getCipherName(uint16_t cipherCode) {
187 // Having this in a hash map saves the binary search inside OpenSSL
188 static std::unordered_map<uint16_t, std::string> cipherCodeToName(
189 getOpenSSLCipherNames());
191 const auto& iter = cipherCodeToName.find(cipherCode);
192 if (iter != cipherCodeToName.end()) {
195 static std::string empty("");
200 bool OpenSSLUtils::setCustomBioReadMethod(
202 int (*meth)(BIO*, char*, int)) {
205 ret = (BIO_meth_set_read(bioMeth, meth) == 1);
206 #elif (defined(OPENSSL_IS_BORINGSSL) || OPENSSL_IS_101 || OPENSSL_IS_102)
207 bioMeth->bread = meth;
214 bool OpenSSLUtils::setCustomBioWriteMethod(
216 int (*meth)(BIO*, const char*, int)) {
219 ret = (BIO_meth_set_write(bioMeth, meth) == 1);
220 #elif (defined(OPENSSL_IS_BORINGSSL) || OPENSSL_IS_101 || OPENSSL_IS_102)
221 bioMeth->bwrite = meth;
228 int OpenSSLUtils::getBioShouldRetryWrite(int r) {
230 #if defined(OPENSSL_IS_BORINGSSL)
231 ret = boringssl_bio_fd_should_retry(r);
233 ret = BIO_sock_should_retry(r);
238 void OpenSSLUtils::setBioAppData(BIO* b, void* ptr) {
239 #if defined(OPENSSL_IS_BORINGSSL)
240 BIO_set_callback_arg(b, static_cast<char*>(ptr));
242 BIO_set_app_data(b, ptr);
246 void* OpenSSLUtils::getBioAppData(BIO* b) {
247 #if defined(OPENSSL_IS_BORINGSSL)
248 return BIO_get_callback_arg(b);
250 return BIO_get_app_data(b);
254 void OpenSSLUtils::setCustomBioMethod(BIO* b, BIO_METHOD* meth) {
255 #if defined(OPENSSL_IS_BORINGSSL)
262 int OpenSSLUtils::getBioFd(BIO* b, int* fd) {
264 int ret = portability::sockets::socket_to_fd((SOCKET)BIO_get_fd(b, fd));
270 return BIO_get_fd(b, fd);
274 void OpenSSLUtils::setBioFd(BIO* b, int fd, int flags) {
276 SOCKET sock = portability::sockets::fd_to_socket(fd);
280 BIO_set_fd(b, sock, flags);
287 #if defined(OPENSSL_IS_BORINGSSL)
289 static int boringssl_bio_fd_non_fatal_error(int err) {
292 err == EWOULDBLOCK ||
294 #ifdef WSAEWOULDBLOCK
295 err == WSAEWOULDBLOCK ||
310 err == EINPROGRESS ||
321 #if defined(OPENSSL_WINDOWS)
324 #pragma warning(push, 3)
328 int boringssl_bio_fd_should_retry(int i) {
330 return boringssl_bio_fd_non_fatal_error((int)GetLastError());
335 #else // !OPENSSL_WINDOWS
338 int boringssl_bio_fd_should_retry(int i) {
340 return boringssl_bio_fd_non_fatal_error(errno);
344 #endif // OPENSSL_WINDOWS
346 #endif // OEPNSSL_IS_BORINGSSL