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 #ifndef GRPC_CORE_TSI_SSL_TRANSPORT_SECURITY_H
20 #define GRPC_CORE_TSI_SSL_TRANSPORT_SECURITY_H
22 #include <grpc/support/port_platform.h>
24 #include <grpc/grpc_security_constants.h>
25 #include "absl/strings/string_view.h"
26 #include "src/core/tsi/transport_security_interface.h"
29 #include <openssl/x509.h>
32 /* Value for the TSI_CERTIFICATE_TYPE_PEER_PROPERTY property for X509 certs. */
33 #define TSI_X509_CERTIFICATE_TYPE "X509"
35 /* This property is of type TSI_PEER_PROPERTY_STRING. */
36 #define TSI_X509_SUBJECT_COMMON_NAME_PEER_PROPERTY "x509_subject_common_name"
37 #define TSI_X509_SUBJECT_ALTERNATIVE_NAME_PEER_PROPERTY \
38 "x509_subject_alternative_name"
39 #define TSI_SSL_SESSION_REUSED_PEER_PROPERTY "ssl_session_reused"
40 #define TSI_X509_PEM_CERT_PROPERTY "x509_pem_cert"
41 #define TSI_X509_PEM_CERT_CHAIN_PROPERTY "x509_pem_cert_chain"
42 #define TSI_SSL_ALPN_SELECTED_PROTOCOL "ssl_alpn_selected_protocol"
43 #define TSI_X509_DNS_PEER_PROPERTY "x509_dns"
44 #define TSI_X509_URI_PEER_PROPERTY "x509_uri"
45 #define TSI_X509_EMAIL_PEER_PROPERTY "x509_email"
46 #define TSI_X509_IP_PEER_PROPERTY "x509_ip"
48 /* --- tsi_ssl_root_certs_store object ---
50 This object stores SSL root certificates. It can be shared by multiple SSL
52 typedef struct tsi_ssl_root_certs_store tsi_ssl_root_certs_store;
54 /* Given a NULL-terminated string containing the PEM encoding of the root
55 certificates, creates a tsi_ssl_root_certs_store object. */
56 tsi_ssl_root_certs_store* tsi_ssl_root_certs_store_create(
57 const char* pem_roots);
59 /* Destroys the tsi_ssl_root_certs_store object. */
60 void tsi_ssl_root_certs_store_destroy(tsi_ssl_root_certs_store* self);
62 /* --- tsi_ssl_session_cache object ---
64 Cache for SSL sessions for sessions resumption. */
66 typedef struct tsi_ssl_session_cache tsi_ssl_session_cache;
68 /* Create LRU cache for SSL sessions with \a capacity. */
69 tsi_ssl_session_cache* tsi_ssl_session_cache_create_lru(size_t capacity);
71 /* Increment reference counter of \a cache. */
72 void tsi_ssl_session_cache_ref(tsi_ssl_session_cache* cache);
74 /* Decrement reference counter of \a cache. */
75 void tsi_ssl_session_cache_unref(tsi_ssl_session_cache* cache);
77 /* --- tsi_ssl_client_handshaker_factory object ---
79 This object creates a client tsi_handshaker objects implemented in terms of
80 the TLS 1.2 specificiation. */
82 typedef struct tsi_ssl_client_handshaker_factory
83 tsi_ssl_client_handshaker_factory;
85 /* Object that holds a private key / certificate chain pair in PEM format. */
86 struct tsi_ssl_pem_key_cert_pair {
87 /* private_key is the NULL-terminated string containing the PEM encoding of
88 the client's private key. */
89 const char* private_key;
91 /* cert_chain is the NULL-terminated string containing the PEM encoding of
92 the client's certificate chain. */
93 const char* cert_chain;
96 Creates a client handshaker factory.
97 - pem_key_cert_pair is a pointer to the object containing client's private
98 key and certificate chain. This parameter can be NULL if the client does
99 not have such a key/cert pair.
100 - pem_roots_cert is the NULL-terminated string containing the PEM encoding of
101 the server root certificates.
102 - cipher_suites contains an optional list of the ciphers that the client
103 supports. The format of this string is described in:
104 https://www.openssl.org/docs/apps/ciphers.html.
105 This parameter can be set to NULL to use the default set of ciphers.
106 TODO(jboeuf): Revisit the format of this parameter.
107 - alpn_protocols is an array containing the NULL terminated protocol names
108 that the handshakers created with this factory support. This parameter can
110 - num_alpn_protocols is the number of alpn protocols and associated lengths
111 specified. If this parameter is 0, the other alpn parameters must be NULL.
112 - factory is the address of the factory pointer to be created.
114 - This method returns TSI_OK on success or TSI_INVALID_PARAMETER in the case
115 where a parameter is invalid. */
116 tsi_result tsi_create_ssl_client_handshaker_factory(
117 const tsi_ssl_pem_key_cert_pair* pem_key_cert_pair,
118 const char* pem_root_certs, const char* cipher_suites,
119 const char** alpn_protocols, uint16_t num_alpn_protocols,
120 tsi_ssl_client_handshaker_factory** factory);
122 struct tsi_ssl_client_handshaker_options {
123 /* pem_key_cert_pair is a pointer to the object containing client's private
124 key and certificate chain. This parameter can be NULL if the client does
125 not have such a key/cert pair. */
126 const tsi_ssl_pem_key_cert_pair* pem_key_cert_pair;
127 /* pem_roots_cert is the NULL-terminated string containing the PEM encoding of
128 the client root certificates. */
129 const char* pem_root_certs;
130 /* root_store is a pointer to the ssl_root_certs_store object. If root_store
131 is not nullptr and SSL implementation permits, root_store will be used as
132 root certificates. Otherwise, pem_roots_cert will be used to load server
133 root certificates. */
134 const tsi_ssl_root_certs_store* root_store;
135 /* cipher_suites contains an optional list of the ciphers that the client
136 supports. The format of this string is described in:
137 https://www.openssl.org/docs/apps/ciphers.html.
138 This parameter can be set to NULL to use the default set of ciphers.
139 TODO(jboeuf): Revisit the format of this parameter. */
140 const char* cipher_suites;
141 /* alpn_protocols is an array containing the NULL terminated protocol names
142 that the handshakers created with this factory support. This parameter can
144 const char** alpn_protocols;
145 /* num_alpn_protocols is the number of alpn protocols and associated lengths
146 specified. If this parameter is 0, the other alpn parameters must be
148 size_t num_alpn_protocols;
149 /* ssl_session_cache is a cache for reusable client-side sessions. */
150 tsi_ssl_session_cache* session_cache;
152 /* skip server certificate verification. */
153 bool skip_server_certificate_verification;
155 /* The min and max TLS versions that will be negotiated by the handshaker. */
156 tsi_tls_version min_tls_version;
157 tsi_tls_version max_tls_version;
159 tsi_ssl_client_handshaker_options()
160 : pem_key_cert_pair(nullptr),
161 pem_root_certs(nullptr),
163 cipher_suites(nullptr),
164 alpn_protocols(nullptr),
165 num_alpn_protocols(0),
166 session_cache(nullptr),
167 skip_server_certificate_verification(false),
168 min_tls_version(tsi_tls_version::TSI_TLS1_2),
169 max_tls_version(tsi_tls_version::TSI_TLS1_3) {}
172 /* Creates a client handshaker factory.
173 - options is the options used to create a factory.
174 - factory is the address of the factory pointer to be created.
176 - This method returns TSI_OK on success or TSI_INVALID_PARAMETER in the case
177 where a parameter is invalid. */
178 tsi_result tsi_create_ssl_client_handshaker_factory_with_options(
179 const tsi_ssl_client_handshaker_options* options,
180 tsi_ssl_client_handshaker_factory** factory);
182 /* Creates a client handshaker.
183 - factory is the factory from which the handshaker will be created.
184 - server_name_indication indicates the name of the server the client is
185 trying to connect to which will be relayed to the server using the SNI
187 - handshaker is the address of the handshaker pointer to be created.
189 - This method returns TSI_OK on success or TSI_INVALID_PARAMETER in the case
190 where a parameter is invalid. */
191 tsi_result tsi_ssl_client_handshaker_factory_create_handshaker(
192 tsi_ssl_client_handshaker_factory* factory,
193 const char* server_name_indication, tsi_handshaker** handshaker);
195 /* Decrements reference count of the handshaker factory. Handshaker factory will
196 * be destroyed once no references exist. */
197 void tsi_ssl_client_handshaker_factory_unref(
198 tsi_ssl_client_handshaker_factory* factory);
200 /* --- tsi_ssl_server_handshaker_factory object ---
202 This object creates a client tsi_handshaker objects implemented in terms of
203 the TLS 1.2 specificiation. */
205 typedef struct tsi_ssl_server_handshaker_factory
206 tsi_ssl_server_handshaker_factory;
209 Creates a server handshaker factory.
210 - pem_key_cert_pairs is an array private key / certificate chains of the
212 - num_key_cert_pairs is the number of items in the pem_key_cert_pairs array.
213 - pem_root_certs is the NULL-terminated string containing the PEM encoding
214 of the client root certificates. This parameter may be NULL if the server
215 does not want the client to be authenticated with SSL.
216 - cipher_suites contains an optional list of the ciphers that the server
217 supports. The format of this string is described in:
218 https://www.openssl.org/docs/apps/ciphers.html.
219 This parameter can be set to NULL to use the default set of ciphers.
220 TODO(jboeuf): Revisit the format of this parameter.
221 - alpn_protocols is an array containing the NULL terminated protocol names
222 that the handshakers created with this factory support. This parameter can
224 - num_alpn_protocols is the number of alpn protocols and associated lengths
225 specified. If this parameter is 0, the other alpn parameters must be NULL.
226 - factory is the address of the factory pointer to be created.
228 - This method returns TSI_OK on success or TSI_INVALID_PARAMETER in the case
229 where a parameter is invalid. */
230 tsi_result tsi_create_ssl_server_handshaker_factory(
231 const tsi_ssl_pem_key_cert_pair* pem_key_cert_pairs,
232 size_t num_key_cert_pairs, const char* pem_client_root_certs,
233 int force_client_auth, const char* cipher_suites,
234 const char** alpn_protocols, uint16_t num_alpn_protocols,
235 tsi_ssl_server_handshaker_factory** factory);
238 Same as tsi_create_ssl_server_handshaker_factory method except uses
239 tsi_client_certificate_request_type to support more ways to handle client
240 certificate authentication.
241 - client_certificate_request, if set to non-zero will force the client to
242 authenticate with an SSL cert. Note that this option is ignored if
243 pem_client_root_certs is NULL or pem_client_roots_certs_size is 0 */
244 tsi_result tsi_create_ssl_server_handshaker_factory_ex(
245 const tsi_ssl_pem_key_cert_pair* pem_key_cert_pairs,
246 size_t num_key_cert_pairs, const char* pem_client_root_certs,
247 tsi_client_certificate_request_type client_certificate_request,
248 const char* cipher_suites, const char** alpn_protocols,
249 uint16_t num_alpn_protocols, tsi_ssl_server_handshaker_factory** factory);
251 struct tsi_ssl_server_handshaker_options {
252 /* pem_key_cert_pairs is an array private key / certificate chains of the
254 const tsi_ssl_pem_key_cert_pair* pem_key_cert_pairs;
255 /* num_key_cert_pairs is the number of items in the pem_key_cert_pairs
257 size_t num_key_cert_pairs;
258 /* pem_root_certs is the NULL-terminated string containing the PEM encoding
259 of the server root certificates. This parameter may be NULL if the server
260 does not want the client to be authenticated with SSL. */
261 const char* pem_client_root_certs;
262 /* client_certificate_request, if set to non-zero will force the client to
263 authenticate with an SSL cert. Note that this option is ignored if
264 pem_client_root_certs is NULL or pem_client_roots_certs_size is 0. */
265 tsi_client_certificate_request_type client_certificate_request;
266 /* cipher_suites contains an optional list of the ciphers that the server
267 supports. The format of this string is described in:
268 https://www.openssl.org/docs/apps/ciphers.html.
269 This parameter can be set to NULL to use the default set of ciphers.
270 TODO(jboeuf): Revisit the format of this parameter. */
271 const char* cipher_suites;
272 /* alpn_protocols is an array containing the NULL terminated protocol names
273 that the handshakers created with this factory support. This parameter can
275 const char** alpn_protocols;
276 /* num_alpn_protocols is the number of alpn protocols and associated lengths
277 specified. If this parameter is 0, the other alpn parameters must be
279 uint16_t num_alpn_protocols;
280 /* session_ticket_key is optional key for encrypting session keys. If
281 parameter is not specified it must be NULL. */
282 const char* session_ticket_key;
283 /* session_ticket_key_size is a size of session ticket encryption key. */
284 size_t session_ticket_key_size;
285 /* The min and max TLS versions that will be negotiated by the handshaker. */
286 tsi_tls_version min_tls_version;
287 tsi_tls_version max_tls_version;
289 tsi_ssl_server_handshaker_options()
290 : pem_key_cert_pairs(nullptr),
291 num_key_cert_pairs(0),
292 pem_client_root_certs(nullptr),
293 client_certificate_request(TSI_DONT_REQUEST_CLIENT_CERTIFICATE),
294 cipher_suites(nullptr),
295 alpn_protocols(nullptr),
296 num_alpn_protocols(0),
297 session_ticket_key(nullptr),
298 session_ticket_key_size(0),
299 min_tls_version(tsi_tls_version::TSI_TLS1_2),
300 max_tls_version(tsi_tls_version::TSI_TLS1_3) {}
303 /* Creates a server handshaker factory.
304 - options is the options used to create a factory.
305 - factory is the address of the factory pointer to be created.
307 - This method returns TSI_OK on success or TSI_INVALID_PARAMETER in the case
308 where a parameter is invalid. */
309 tsi_result tsi_create_ssl_server_handshaker_factory_with_options(
310 const tsi_ssl_server_handshaker_options* options,
311 tsi_ssl_server_handshaker_factory** factory);
313 /* Creates a server handshaker.
314 - factory is the factory from which the handshaker will be created.
315 - handshaker is the address of the handshaker pointer to be created.
317 - This method returns TSI_OK on success or TSI_INVALID_PARAMETER in the case
318 where a parameter is invalid. */
319 tsi_result tsi_ssl_server_handshaker_factory_create_handshaker(
320 tsi_ssl_server_handshaker_factory* factory, tsi_handshaker** handshaker);
322 /* Decrements reference count of the handshaker factory. Handshaker factory will
323 * be destroyed once no references exist. */
324 void tsi_ssl_server_handshaker_factory_unref(
325 tsi_ssl_server_handshaker_factory* factory);
327 /* Util that checks that an ssl peer matches a specific name.
330 - handle %encoded chars.
331 - handle public suffix wildchar more strictly (e.g. *.co.uk) */
332 int tsi_ssl_peer_matches_name(const tsi_peer* peer, absl::string_view name);
334 /* --- Testing support. ---
336 These functions and typedefs are not intended to be used outside of testing.
339 /* Base type of client and server handshaker factories. */
340 typedef struct tsi_ssl_handshaker_factory tsi_ssl_handshaker_factory;
342 /* Function pointer to handshaker_factory destructor. */
343 typedef void (*tsi_ssl_handshaker_factory_destructor)(
344 tsi_ssl_handshaker_factory* factory);
346 /* Virtual table for tsi_ssl_handshaker_factory. */
347 struct tsi_ssl_handshaker_factory_vtable {
348 tsi_ssl_handshaker_factory_destructor destroy;
350 /* Set destructor of handshaker_factory to new_destructor, returns previous
352 const tsi_ssl_handshaker_factory_vtable* tsi_ssl_handshaker_factory_swap_vtable(
353 tsi_ssl_handshaker_factory* factory,
354 tsi_ssl_handshaker_factory_vtable* new_vtable);
356 /* Exposed for testing only. */
357 tsi_result tsi_ssl_extract_x509_subject_names_from_pem_cert(
358 const char* pem_cert, tsi_peer* peer);
360 /* Exposed for testing only. */
361 tsi_result tsi_ssl_get_cert_chain_contents(STACK_OF(X509) * peer_chain,
362 tsi_peer_property* property);
364 #endif /* GRPC_CORE_TSI_SSL_TRANSPORT_SECURITY_H */