3 * Copyright 2015 gRPC authors.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
19 #include <grpc/support/port_platform.h>
21 #include "src/core/lib/security/security_connector/ssl_utils.h"
23 #include <grpc/slice_buffer.h>
24 #include <grpc/support/alloc.h>
25 #include <grpc/support/log.h>
26 #include <grpc/support/string_util.h>
28 #include "src/core/ext/transport/chttp2/alpn/alpn.h"
29 #include "src/core/lib/channel/channel_args.h"
30 #include "src/core/lib/gpr/string.h"
31 #include "src/core/lib/gprpp/host_port.h"
32 #include "src/core/lib/gprpp/ref_counted_ptr.h"
33 #include "src/core/lib/iomgr/load_file.h"
34 #include "src/core/lib/security/context/security_context.h"
35 #include "src/core/lib/security/security_connector/load_system_roots.h"
36 #include "src/core/lib/security/security_connector/ssl_utils_config.h"
37 #include "src/core/tsi/ssl_transport_security.h"
39 /* -- Constants. -- */
41 #ifndef INSTALL_PREFIX
42 static const char* installed_roots_path = "/usr/share/grpc/roots.pem";
44 static const char* installed_roots_path =
45 INSTALL_PREFIX "/share/grpc/roots.pem";
48 #ifndef TSI_OPENSSL_ALPN_SUPPORT
49 #define TSI_OPENSSL_ALPN_SUPPORT 1
52 /* -- Overridden default roots. -- */
54 static grpc_ssl_roots_override_callback ssl_roots_override_cb = nullptr;
56 void grpc_set_ssl_roots_override_callback(grpc_ssl_roots_override_callback cb) {
57 ssl_roots_override_cb = cb;
60 /* -- Cipher suites. -- */
62 static gpr_once cipher_suites_once = GPR_ONCE_INIT;
63 static const char* cipher_suites = nullptr;
65 // All cipher suites for default are compliant with HTTP2.
66 GPR_GLOBAL_CONFIG_DEFINE_STRING(
67 grpc_ssl_cipher_suites,
68 "ECDHE-ECDSA-AES128-GCM-SHA256:"
69 "ECDHE-ECDSA-AES256-GCM-SHA384:"
70 "ECDHE-RSA-AES128-GCM-SHA256:"
71 "ECDHE-RSA-AES256-GCM-SHA384",
72 "A colon separated list of cipher suites to use with OpenSSL")
74 static void init_cipher_suites(void) {
75 grpc_core::UniquePtr<char> value =
76 GPR_GLOBAL_CONFIG_GET(grpc_ssl_cipher_suites);
77 cipher_suites = value.release();
82 const char* grpc_get_ssl_cipher_suites(void) {
83 gpr_once_init(&cipher_suites_once, init_cipher_suites);
87 tsi_client_certificate_request_type
88 grpc_get_tsi_client_certificate_request_type(
89 grpc_ssl_client_certificate_request_type grpc_request_type) {
90 switch (grpc_request_type) {
91 case GRPC_SSL_DONT_REQUEST_CLIENT_CERTIFICATE:
92 return TSI_DONT_REQUEST_CLIENT_CERTIFICATE;
94 case GRPC_SSL_REQUEST_CLIENT_CERTIFICATE_BUT_DONT_VERIFY:
95 return TSI_REQUEST_CLIENT_CERTIFICATE_BUT_DONT_VERIFY;
97 case GRPC_SSL_REQUEST_CLIENT_CERTIFICATE_AND_VERIFY:
98 return TSI_REQUEST_CLIENT_CERTIFICATE_AND_VERIFY;
100 case GRPC_SSL_REQUEST_AND_REQUIRE_CLIENT_CERTIFICATE_BUT_DONT_VERIFY:
101 return TSI_REQUEST_AND_REQUIRE_CLIENT_CERTIFICATE_BUT_DONT_VERIFY;
103 case GRPC_SSL_REQUEST_AND_REQUIRE_CLIENT_CERTIFICATE_AND_VERIFY:
104 return TSI_REQUEST_AND_REQUIRE_CLIENT_CERTIFICATE_AND_VERIFY;
107 return TSI_DONT_REQUEST_CLIENT_CERTIFICATE;
111 grpc_error* grpc_ssl_check_alpn(const tsi_peer* peer) {
112 #if TSI_OPENSSL_ALPN_SUPPORT
113 /* Check the ALPN if ALPN is supported. */
114 const tsi_peer_property* p =
115 tsi_peer_get_property_by_name(peer, TSI_SSL_ALPN_SELECTED_PROTOCOL);
117 return GRPC_ERROR_CREATE_FROM_STATIC_STRING(
118 "Cannot check peer: missing selected ALPN property.");
120 if (!grpc_chttp2_is_alpn_version_supported(p->value.data, p->value.length)) {
121 return GRPC_ERROR_CREATE_FROM_STATIC_STRING(
122 "Cannot check peer: invalid ALPN value.");
124 #endif /* TSI_OPENSSL_ALPN_SUPPORT */
125 return GRPC_ERROR_NONE;
128 grpc_error* grpc_ssl_check_peer_name(grpc_core::StringView peer_name,
129 const tsi_peer* peer) {
130 /* Check the peer name if specified. */
131 if (!peer_name.empty() && !grpc_ssl_host_matches_name(peer, peer_name)) {
133 gpr_asprintf(&msg, "Peer name %s is not in peer certificate",
135 grpc_error* error = GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg);
139 return GRPC_ERROR_NONE;
142 bool grpc_ssl_check_call_host(grpc_core::StringView host,
143 grpc_core::StringView target_name,
144 grpc_core::StringView overridden_target_name,
145 grpc_auth_context* auth_context,
146 grpc_closure* on_call_host_checked,
147 grpc_error** error) {
148 grpc_security_status status = GRPC_SECURITY_ERROR;
149 tsi_peer peer = grpc_shallow_peer_from_ssl_auth_context(auth_context);
150 if (grpc_ssl_host_matches_name(&peer, host)) status = GRPC_SECURITY_OK;
151 if (!overridden_target_name.empty() && host == target_name) {
152 status = GRPC_SECURITY_OK;
154 if (status != GRPC_SECURITY_OK) {
155 *error = GRPC_ERROR_CREATE_FROM_STATIC_STRING(
156 "call host does not match SSL server name");
158 grpc_shallow_peer_destruct(&peer);
162 const char** grpc_fill_alpn_protocol_strings(size_t* num_alpn_protocols) {
163 GPR_ASSERT(num_alpn_protocols != nullptr);
164 *num_alpn_protocols = grpc_chttp2_num_alpn_versions();
165 const char** alpn_protocol_strings = static_cast<const char**>(
166 gpr_malloc(sizeof(const char*) * (*num_alpn_protocols)));
167 for (size_t i = 0; i < *num_alpn_protocols; i++) {
168 alpn_protocol_strings[i] = grpc_chttp2_get_alpn_version_index(i);
170 return alpn_protocol_strings;
173 int grpc_ssl_host_matches_name(const tsi_peer* peer,
174 grpc_core::StringView peer_name) {
175 grpc_core::StringView allocated_name;
176 grpc_core::StringView ignored_port;
177 grpc_core::SplitHostPort(peer_name, &allocated_name, &ignored_port);
178 if (allocated_name.empty()) return 0;
180 // IPv6 zone-id should not be included in comparisons.
181 const size_t zone_id = allocated_name.find('%');
182 if (zone_id != grpc_core::StringView::npos) {
183 allocated_name.remove_suffix(allocated_name.size() - zone_id);
185 return tsi_ssl_peer_matches_name(peer, allocated_name);
188 int grpc_ssl_cmp_target_name(
189 grpc_core::StringView target_name, grpc_core::StringView other_target_name,
190 grpc_core::StringView overridden_target_name,
191 grpc_core::StringView other_overridden_target_name) {
192 int c = target_name.cmp(other_target_name);
193 if (c != 0) return c;
194 return overridden_target_name.cmp(other_overridden_target_name);
197 grpc_core::RefCountedPtr<grpc_auth_context> grpc_ssl_peer_to_auth_context(
198 const tsi_peer* peer) {
200 const char* peer_identity_property_name = nullptr;
202 /* The caller has checked the certificate type property. */
203 GPR_ASSERT(peer->property_count >= 1);
204 grpc_core::RefCountedPtr<grpc_auth_context> ctx =
205 grpc_core::MakeRefCounted<grpc_auth_context>(nullptr);
206 grpc_auth_context_add_cstring_property(
207 ctx.get(), GRPC_TRANSPORT_SECURITY_TYPE_PROPERTY_NAME,
208 GRPC_SSL_TRANSPORT_SECURITY_TYPE);
209 for (i = 0; i < peer->property_count; i++) {
210 const tsi_peer_property* prop = &peer->properties[i];
211 if (prop->name == nullptr) continue;
212 if (strcmp(prop->name, TSI_X509_SUBJECT_COMMON_NAME_PEER_PROPERTY) == 0) {
213 /* If there is no subject alt name, have the CN as the identity. */
214 if (peer_identity_property_name == nullptr) {
215 peer_identity_property_name = GRPC_X509_CN_PROPERTY_NAME;
217 grpc_auth_context_add_property(ctx.get(), GRPC_X509_CN_PROPERTY_NAME,
218 prop->value.data, prop->value.length);
219 } else if (strcmp(prop->name,
220 TSI_X509_SUBJECT_ALTERNATIVE_NAME_PEER_PROPERTY) == 0) {
221 peer_identity_property_name = GRPC_X509_SAN_PROPERTY_NAME;
222 grpc_auth_context_add_property(ctx.get(), GRPC_X509_SAN_PROPERTY_NAME,
223 prop->value.data, prop->value.length);
224 } else if (strcmp(prop->name, TSI_X509_PEM_CERT_PROPERTY) == 0) {
225 grpc_auth_context_add_property(ctx.get(),
226 GRPC_X509_PEM_CERT_PROPERTY_NAME,
227 prop->value.data, prop->value.length);
228 } else if (strcmp(prop->name, TSI_SSL_SESSION_REUSED_PEER_PROPERTY) == 0) {
229 grpc_auth_context_add_property(ctx.get(),
230 GRPC_SSL_SESSION_REUSED_PROPERTY,
231 prop->value.data, prop->value.length);
234 if (peer_identity_property_name != nullptr) {
235 GPR_ASSERT(grpc_auth_context_set_peer_identity_property_name(
236 ctx.get(), peer_identity_property_name) == 1);
241 static void add_shallow_auth_property_to_peer(tsi_peer* peer,
242 const grpc_auth_property* prop,
243 const char* tsi_prop_name) {
244 tsi_peer_property* tsi_prop = &peer->properties[peer->property_count++];
245 tsi_prop->name = const_cast<char*>(tsi_prop_name);
246 tsi_prop->value.data = prop->value;
247 tsi_prop->value.length = prop->value_length;
250 tsi_peer grpc_shallow_peer_from_ssl_auth_context(
251 const grpc_auth_context* auth_context) {
252 size_t max_num_props = 0;
253 grpc_auth_property_iterator it;
254 const grpc_auth_property* prop;
256 memset(&peer, 0, sizeof(peer));
258 it = grpc_auth_context_property_iterator(auth_context);
259 while (grpc_auth_property_iterator_next(&it) != nullptr) max_num_props++;
261 if (max_num_props > 0) {
262 peer.properties = static_cast<tsi_peer_property*>(
263 gpr_malloc(max_num_props * sizeof(tsi_peer_property)));
264 it = grpc_auth_context_property_iterator(auth_context);
265 while ((prop = grpc_auth_property_iterator_next(&it)) != nullptr) {
266 if (strcmp(prop->name, GRPC_X509_SAN_PROPERTY_NAME) == 0) {
267 add_shallow_auth_property_to_peer(
268 &peer, prop, TSI_X509_SUBJECT_ALTERNATIVE_NAME_PEER_PROPERTY);
269 } else if (strcmp(prop->name, GRPC_X509_CN_PROPERTY_NAME) == 0) {
270 add_shallow_auth_property_to_peer(
271 &peer, prop, TSI_X509_SUBJECT_COMMON_NAME_PEER_PROPERTY);
272 } else if (strcmp(prop->name, GRPC_X509_PEM_CERT_PROPERTY_NAME) == 0) {
273 add_shallow_auth_property_to_peer(&peer, prop,
274 TSI_X509_PEM_CERT_PROPERTY);
281 void grpc_shallow_peer_destruct(tsi_peer* peer) {
282 if (peer->properties != nullptr) gpr_free(peer->properties);
285 grpc_security_status grpc_ssl_tsi_client_handshaker_factory_init(
286 tsi_ssl_pem_key_cert_pair* pem_key_cert_pair, const char* pem_root_certs,
287 tsi_ssl_session_cache* ssl_session_cache,
288 tsi_ssl_client_handshaker_factory** handshaker_factory) {
289 const char* root_certs;
290 const tsi_ssl_root_certs_store* root_store;
291 if (pem_root_certs == nullptr) {
292 // Use default root certificates.
293 root_certs = grpc_core::DefaultSslRootStore::GetPemRootCerts();
294 if (root_certs == nullptr) {
295 gpr_log(GPR_ERROR, "Could not get default pem root certs.");
296 return GRPC_SECURITY_ERROR;
298 root_store = grpc_core::DefaultSslRootStore::GetRootStore();
300 root_certs = pem_root_certs;
301 root_store = nullptr;
303 bool has_key_cert_pair = pem_key_cert_pair != nullptr &&
304 pem_key_cert_pair->private_key != nullptr &&
305 pem_key_cert_pair->cert_chain != nullptr;
306 tsi_ssl_client_handshaker_options options;
307 GPR_DEBUG_ASSERT(root_certs != nullptr);
308 options.pem_root_certs = root_certs;
309 options.root_store = root_store;
310 options.alpn_protocols =
311 grpc_fill_alpn_protocol_strings(&options.num_alpn_protocols);
312 if (has_key_cert_pair) {
313 options.pem_key_cert_pair = pem_key_cert_pair;
315 options.cipher_suites = grpc_get_ssl_cipher_suites();
316 options.session_cache = ssl_session_cache;
317 const tsi_result result =
318 tsi_create_ssl_client_handshaker_factory_with_options(&options,
320 gpr_free((void*)options.alpn_protocols);
321 if (result != TSI_OK) {
322 gpr_log(GPR_ERROR, "Handshaker factory creation failed with %s.",
323 tsi_result_to_string(result));
324 return GRPC_SECURITY_ERROR;
326 return GRPC_SECURITY_OK;
329 grpc_security_status grpc_ssl_tsi_server_handshaker_factory_init(
330 tsi_ssl_pem_key_cert_pair* pem_key_cert_pairs, size_t num_key_cert_pairs,
331 const char* pem_root_certs,
332 grpc_ssl_client_certificate_request_type client_certificate_request,
333 tsi_ssl_server_handshaker_factory** handshaker_factory) {
334 size_t num_alpn_protocols = 0;
335 const char** alpn_protocol_strings =
336 grpc_fill_alpn_protocol_strings(&num_alpn_protocols);
337 tsi_ssl_server_handshaker_options options;
338 options.pem_key_cert_pairs = pem_key_cert_pairs;
339 options.num_key_cert_pairs = num_key_cert_pairs;
340 options.pem_client_root_certs = pem_root_certs;
341 options.client_certificate_request =
342 grpc_get_tsi_client_certificate_request_type(client_certificate_request);
343 options.cipher_suites = grpc_get_ssl_cipher_suites();
344 options.alpn_protocols = alpn_protocol_strings;
345 options.num_alpn_protocols = static_cast<uint16_t>(num_alpn_protocols);
346 const tsi_result result =
347 tsi_create_ssl_server_handshaker_factory_with_options(&options,
349 gpr_free((void*)alpn_protocol_strings);
350 if (result != TSI_OK) {
351 gpr_log(GPR_ERROR, "Handshaker factory creation failed with %s.",
352 tsi_result_to_string(result));
353 return GRPC_SECURITY_ERROR;
355 return GRPC_SECURITY_OK;
358 /* --- Ssl cache implementation. --- */
360 grpc_ssl_session_cache* grpc_ssl_session_cache_create_lru(size_t capacity) {
361 tsi_ssl_session_cache* cache = tsi_ssl_session_cache_create_lru(capacity);
362 return reinterpret_cast<grpc_ssl_session_cache*>(cache);
365 void grpc_ssl_session_cache_destroy(grpc_ssl_session_cache* cache) {
366 tsi_ssl_session_cache* tsi_cache =
367 reinterpret_cast<tsi_ssl_session_cache*>(cache);
368 tsi_ssl_session_cache_unref(tsi_cache);
371 static void* grpc_ssl_session_cache_arg_copy(void* p) {
372 tsi_ssl_session_cache* tsi_cache =
373 reinterpret_cast<tsi_ssl_session_cache*>(p);
374 // destroy call below will unref the pointer.
375 tsi_ssl_session_cache_ref(tsi_cache);
379 static void grpc_ssl_session_cache_arg_destroy(void* p) {
380 tsi_ssl_session_cache* tsi_cache =
381 reinterpret_cast<tsi_ssl_session_cache*>(p);
382 tsi_ssl_session_cache_unref(tsi_cache);
385 static int grpc_ssl_session_cache_arg_cmp(void* p, void* q) {
386 return GPR_ICMP(p, q);
389 grpc_arg grpc_ssl_session_cache_create_channel_arg(
390 grpc_ssl_session_cache* cache) {
391 static const grpc_arg_pointer_vtable vtable = {
392 grpc_ssl_session_cache_arg_copy,
393 grpc_ssl_session_cache_arg_destroy,
394 grpc_ssl_session_cache_arg_cmp,
396 return grpc_channel_arg_pointer_create(
397 const_cast<char*>(GRPC_SSL_SESSION_CACHE_ARG), cache, &vtable);
400 /* --- Default SSL root store implementation. --- */
402 namespace grpc_core {
404 tsi_ssl_root_certs_store* DefaultSslRootStore::default_root_store_;
405 grpc_slice DefaultSslRootStore::default_pem_root_certs_;
407 const tsi_ssl_root_certs_store* DefaultSslRootStore::GetRootStore() {
409 return default_root_store_;
412 const char* DefaultSslRootStore::GetPemRootCerts() {
414 return GRPC_SLICE_IS_EMPTY(default_pem_root_certs_)
416 : reinterpret_cast<const char*>
417 GRPC_SLICE_START_PTR(default_pem_root_certs_);
420 grpc_slice DefaultSslRootStore::ComputePemRootCerts() {
421 grpc_slice result = grpc_empty_slice();
422 const bool not_use_system_roots =
423 GPR_GLOBAL_CONFIG_GET(grpc_not_use_system_ssl_roots);
424 // First try to load the roots from the configuration.
425 UniquePtr<char> default_root_certs_path =
426 GPR_GLOBAL_CONFIG_GET(grpc_default_ssl_roots_file_path);
427 if (strlen(default_root_certs_path.get()) > 0) {
429 "load_file", grpc_load_file(default_root_certs_path.get(), 1, &result));
431 // Try overridden roots if needed.
432 grpc_ssl_roots_override_result ovrd_res = GRPC_SSL_ROOTS_OVERRIDE_FAIL;
433 if (GRPC_SLICE_IS_EMPTY(result) && ssl_roots_override_cb != nullptr) {
434 char* pem_root_certs = nullptr;
435 ovrd_res = ssl_roots_override_cb(&pem_root_certs);
436 if (ovrd_res == GRPC_SSL_ROOTS_OVERRIDE_OK) {
437 GPR_ASSERT(pem_root_certs != nullptr);
438 result = grpc_slice_from_copied_buffer(
440 strlen(pem_root_certs) + 1); // nullptr terminator.
442 gpr_free(pem_root_certs);
444 // Try loading roots from OS trust store if flag is enabled.
445 if (GRPC_SLICE_IS_EMPTY(result) && !not_use_system_roots) {
446 result = LoadSystemRootCerts();
448 // Fallback to roots manually shipped with gRPC.
449 if (GRPC_SLICE_IS_EMPTY(result) &&
450 ovrd_res != GRPC_SSL_ROOTS_OVERRIDE_FAIL_PERMANENTLY) {
451 GRPC_LOG_IF_ERROR("load_file",
452 grpc_load_file(installed_roots_path, 1, &result));
457 void DefaultSslRootStore::InitRootStore() {
458 static gpr_once once = GPR_ONCE_INIT;
459 gpr_once_init(&once, DefaultSslRootStore::InitRootStoreOnce);
462 void DefaultSslRootStore::InitRootStoreOnce() {
463 default_pem_root_certs_ = ComputePemRootCerts();
464 if (!GRPC_SLICE_IS_EMPTY(default_pem_root_certs_)) {
465 default_root_store_ =
466 tsi_ssl_root_certs_store_create(reinterpret_cast<const char*>(
467 GRPC_SLICE_START_PTR(default_pem_root_certs_)));
471 } // namespace grpc_core