/* * * Copyright 2015, Google Inc. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following disclaimer * in the documentation and/or other materials provided with the * distribution. * * Neither the name of Google Inc. nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #include "src/core/lib/tsi/ssl_transport_security.h" #include #include #include /* TODO(jboeuf): refactor inet_ntop into a portability header. */ #ifdef GPR_WINSOCK_SOCKET #include #else #include #endif #include #include #include #include #include #include /* For OPENSSL_free */ #include #include #include #include #include "src/core/lib/tsi/ssl_types.h" #include "src/core/lib/tsi/transport_security.h" /* --- Constants. ---*/ #define TSI_SSL_MAX_PROTECTED_FRAME_SIZE_UPPER_BOUND 16384 #define TSI_SSL_MAX_PROTECTED_FRAME_SIZE_LOWER_BOUND 1024 /* Putting a macro like this and littering the source file with #if is really bad practice. TODO(jboeuf): refactor all the #if / #endif in a separate module. */ #ifndef TSI_OPENSSL_ALPN_SUPPORT #define TSI_OPENSSL_ALPN_SUPPORT 1 #endif /* TODO(jboeuf): I have not found a way to get this number dynamically from the SSL structure. This is what we would ultimately want though... */ #define TSI_SSL_MAX_PROTECTION_OVERHEAD 100 /* --- Structure definitions. ---*/ struct tsi_ssl_handshaker_factory { tsi_result (*create_handshaker)(tsi_ssl_handshaker_factory *self, const char *server_name_indication, tsi_handshaker **handshaker); void (*destroy)(tsi_ssl_handshaker_factory *self); }; typedef struct { tsi_ssl_handshaker_factory base; SSL_CTX *ssl_context; unsigned char *alpn_protocol_list; size_t alpn_protocol_list_length; } tsi_ssl_client_handshaker_factory; typedef struct { tsi_ssl_handshaker_factory base; /* Several contexts to support SNI. The tsi_peer array contains the subject names of the server certificates associated with the contexts at the same index. */ SSL_CTX **ssl_contexts; tsi_peer *ssl_context_x509_subject_names; size_t ssl_context_count; unsigned char *alpn_protocol_list; size_t alpn_protocol_list_length; } tsi_ssl_server_handshaker_factory; typedef struct { tsi_handshaker base; SSL *ssl; BIO *into_ssl; BIO *from_ssl; tsi_result result; } tsi_ssl_handshaker; typedef struct { tsi_frame_protector base; SSL *ssl; BIO *into_ssl; BIO *from_ssl; unsigned char *buffer; size_t buffer_size; size_t buffer_offset; } tsi_ssl_frame_protector; /* --- Library Initialization. ---*/ static gpr_once init_openssl_once = GPR_ONCE_INIT; static gpr_mu *openssl_mutexes = NULL; static void openssl_locking_cb(int mode, int type, const char *file, int line) { if (mode & CRYPTO_LOCK) { gpr_mu_lock(&openssl_mutexes[type]); } else { gpr_mu_unlock(&openssl_mutexes[type]); } } static unsigned long openssl_thread_id_cb(void) { return (unsigned long)gpr_thd_currentid(); } static void init_openssl(void) { int i; int num_locks; SSL_library_init(); SSL_load_error_strings(); OpenSSL_add_all_algorithms(); num_locks = CRYPTO_num_locks(); GPR_ASSERT(num_locks > 0); openssl_mutexes = malloc((size_t)num_locks * sizeof(gpr_mu)); GPR_ASSERT(openssl_mutexes != NULL); for (i = 0; i < CRYPTO_num_locks(); i++) { gpr_mu_init(&openssl_mutexes[i]); } CRYPTO_set_locking_callback(openssl_locking_cb); CRYPTO_set_id_callback(openssl_thread_id_cb); } /* --- Ssl utils. ---*/ static const char *ssl_error_string(int error) { switch (error) { case SSL_ERROR_NONE: return "SSL_ERROR_NONE"; case SSL_ERROR_ZERO_RETURN: return "SSL_ERROR_ZERO_RETURN"; case SSL_ERROR_WANT_READ: return "SSL_ERROR_WANT_READ"; case SSL_ERROR_WANT_WRITE: return "SSL_ERROR_WANT_WRITE"; case SSL_ERROR_WANT_CONNECT: return "SSL_ERROR_WANT_CONNECT"; case SSL_ERROR_WANT_ACCEPT: return "SSL_ERROR_WANT_ACCEPT"; case SSL_ERROR_WANT_X509_LOOKUP: return "SSL_ERROR_WANT_X509_LOOKUP"; case SSL_ERROR_SYSCALL: return "SSL_ERROR_SYSCALL"; case SSL_ERROR_SSL: return "SSL_ERROR_SSL"; default: return "Unknown error"; } } /* TODO(jboeuf): Remove when we are past the debugging phase with this code. */ static void ssl_log_where_info(const SSL *ssl, int where, int flag, const char *msg) { if ((where & flag) && tsi_tracing_enabled) { gpr_log(GPR_INFO, "%20.20s - %30.30s - %5.10s", msg, SSL_state_string_long(ssl), SSL_state_string(ssl)); } } /* Used for debugging. TODO(jboeuf): Remove when code is mature enough. */ static void ssl_info_callback(const SSL *ssl, int where, int ret) { if (ret == 0) { gpr_log(GPR_ERROR, "ssl_info_callback: error occured.\n"); return; } ssl_log_where_info(ssl, where, SSL_CB_LOOP, "LOOP"); ssl_log_where_info(ssl, where, SSL_CB_HANDSHAKE_START, "HANDSHAKE START"); ssl_log_where_info(ssl, where, SSL_CB_HANDSHAKE_DONE, "HANDSHAKE DONE"); } /* Returns 1 if name looks like an IP address, 0 otherwise. This is a very rough heuristic, and only handles IPv6 in hexadecimal form. */ static int looks_like_ip_address(const char *name) { size_t i; size_t dot_count = 0; size_t num_size = 0; for (i = 0; i < strlen(name); i++) { if (name[i] == ':') { /* IPv6 Address in hexadecimal form, : is not allowed in DNS names. */ return 1; } if (name[i] >= '0' && name[i] <= '9') { if (num_size > 3) return 0; num_size++; } else if (name[i] == '.') { if (dot_count > 3 || num_size == 0) return 0; dot_count++; num_size = 0; } else { return 0; } } if (dot_count < 3 || num_size == 0) return 0; return 1; } /* Gets the subject CN from an X509 cert. */ static tsi_result ssl_get_x509_common_name(X509 *cert, unsigned char **utf8, size_t *utf8_size) { int common_name_index = -1; X509_NAME_ENTRY *common_name_entry = NULL; ASN1_STRING *common_name_asn1 = NULL; X509_NAME *subject_name = X509_get_subject_name(cert); int utf8_returned_size = 0; if (subject_name == NULL) { gpr_log(GPR_ERROR, "Could not get subject name from certificate."); return TSI_NOT_FOUND; } common_name_index = X509_NAME_get_index_by_NID(subject_name, NID_commonName, -1); if (common_name_index == -1) { gpr_log(GPR_ERROR, "Could not get common name of subject from certificate."); return TSI_NOT_FOUND; } common_name_entry = X509_NAME_get_entry(subject_name, common_name_index); if (common_name_entry == NULL) { gpr_log(GPR_ERROR, "Could not get common name entry from certificate."); return TSI_INTERNAL_ERROR; } common_name_asn1 = X509_NAME_ENTRY_get_data(common_name_entry); if (common_name_asn1 == NULL) { gpr_log(GPR_ERROR, "Could not get common name entry asn1 from certificate."); return TSI_INTERNAL_ERROR; } utf8_returned_size = ASN1_STRING_to_UTF8(utf8, common_name_asn1); if (utf8_returned_size < 0) { gpr_log(GPR_ERROR, "Could not extract utf8 from asn1 string."); return TSI_OUT_OF_RESOURCES; } *utf8_size = (size_t)utf8_returned_size; return TSI_OK; } /* Gets the subject CN of an X509 cert as a tsi_peer_property. */ static tsi_result peer_property_from_x509_common_name( X509 *cert, tsi_peer_property *property) { unsigned char *common_name; size_t common_name_size; tsi_result result = ssl_get_x509_common_name(cert, &common_name, &common_name_size); if (result != TSI_OK) { if (result == TSI_NOT_FOUND) { common_name = NULL; common_name_size = 0; } else { return result; } } result = tsi_construct_string_peer_property( TSI_X509_SUBJECT_COMMON_NAME_PEER_PROPERTY, common_name == NULL ? "" : (const char *)common_name, common_name_size, property); OPENSSL_free(common_name); return result; } /* Gets the X509 cert in PEM format as a tsi_peer_property. */ static tsi_result add_pem_certificate(X509 *cert, tsi_peer_property *property) { BIO *bio = BIO_new(BIO_s_mem()); if (!PEM_write_bio_X509(bio, cert)) { BIO_free(bio); return TSI_INTERNAL_ERROR; } char *contents; long len = BIO_get_mem_data(bio, &contents); if (len <= 0) { BIO_free(bio); return TSI_INTERNAL_ERROR; } tsi_result result = tsi_construct_string_peer_property( TSI_X509_PEM_CERT_PROPERTY, (const char *)contents, (size_t)len, property); BIO_free(bio); return result; } /* Gets the subject SANs from an X509 cert as a tsi_peer_property. */ static tsi_result add_subject_alt_names_properties_to_peer( tsi_peer *peer, GENERAL_NAMES *subject_alt_names, size_t subject_alt_name_count) { size_t i; tsi_result result = TSI_OK; /* Reset for DNS entries filtering. */ peer->property_count -= subject_alt_name_count; for (i = 0; i < subject_alt_name_count; i++) { GENERAL_NAME *subject_alt_name = sk_GENERAL_NAME_value(subject_alt_names, TSI_SIZE_AS_SIZE(i)); /* Filter out the non-dns entries names. */ if (subject_alt_name->type == GEN_DNS) { unsigned char *name = NULL; int name_size; name_size = ASN1_STRING_to_UTF8(&name, subject_alt_name->d.dNSName); if (name_size < 0) { gpr_log(GPR_ERROR, "Could not get utf8 from asn1 string."); result = TSI_INTERNAL_ERROR; break; } result = tsi_construct_string_peer_property( TSI_X509_SUBJECT_ALTERNATIVE_NAME_PEER_PROPERTY, (const char *)name, (size_t)name_size, &peer->properties[peer->property_count++]); OPENSSL_free(name); } else if (subject_alt_name->type == GEN_IPADD) { char ntop_buf[INET6_ADDRSTRLEN]; int af; if (subject_alt_name->d.iPAddress->length == 4) { af = AF_INET; } else if (subject_alt_name->d.iPAddress->length == 16) { af = AF_INET6; } else { gpr_log(GPR_ERROR, "SAN IP Address contained invalid IP"); result = TSI_INTERNAL_ERROR; break; } const char *name = inet_ntop(af, subject_alt_name->d.iPAddress->data, ntop_buf, INET6_ADDRSTRLEN); if (name == NULL) { gpr_log(GPR_ERROR, "Could not get IP string from asn1 octet."); result = TSI_INTERNAL_ERROR; break; } result = tsi_construct_string_peer_property_from_cstring( TSI_X509_SUBJECT_ALTERNATIVE_NAME_PEER_PROPERTY, name, &peer->properties[peer->property_count++]); } if (result != TSI_OK) break; } return result; } /* Gets information about the peer's X509 cert as a tsi_peer object. */ static tsi_result peer_from_x509(X509 *cert, int include_certificate_type, tsi_peer *peer) { /* TODO(jboeuf): Maybe add more properties. */ GENERAL_NAMES *subject_alt_names = X509_get_ext_d2i(cert, NID_subject_alt_name, 0, 0); int subject_alt_name_count = (subject_alt_names != NULL) ? (int)sk_GENERAL_NAME_num(subject_alt_names) : 0; size_t property_count; tsi_result result; GPR_ASSERT(subject_alt_name_count >= 0); property_count = (include_certificate_type ? (size_t)1 : 0) + 2 /* common name, certificate */ + (size_t)subject_alt_name_count; result = tsi_construct_peer(property_count, peer); if (result != TSI_OK) return result; do { if (include_certificate_type) { result = tsi_construct_string_peer_property_from_cstring( TSI_CERTIFICATE_TYPE_PEER_PROPERTY, TSI_X509_CERTIFICATE_TYPE, &peer->properties[0]); if (result != TSI_OK) break; } result = peer_property_from_x509_common_name( cert, &peer->properties[include_certificate_type ? 1 : 0]); if (result != TSI_OK) break; result = add_pem_certificate( cert, &peer->properties[include_certificate_type ? 2 : 1]); if (result != TSI_OK) break; if (subject_alt_name_count != 0) { result = add_subject_alt_names_properties_to_peer( peer, subject_alt_names, (size_t)subject_alt_name_count); if (result != TSI_OK) break; } } while (0); if (subject_alt_names != NULL) { sk_GENERAL_NAME_pop_free(subject_alt_names, GENERAL_NAME_free); } if (result != TSI_OK) tsi_peer_destruct(peer); return result; } /* Logs the SSL error stack. */ static void log_ssl_error_stack(void) { unsigned long err; while ((err = ERR_get_error()) != 0) { char details[256]; ERR_error_string_n((uint32_t)err, details, sizeof(details)); gpr_log(GPR_ERROR, "%s", details); } } /* Performs an SSL_read and handle errors. */ static tsi_result do_ssl_read(SSL *ssl, unsigned char *unprotected_bytes, size_t *unprotected_bytes_size) { int read_from_ssl; GPR_ASSERT(*unprotected_bytes_size <= INT_MAX); read_from_ssl = SSL_read(ssl, unprotected_bytes, (int)*unprotected_bytes_size); if (read_from_ssl == 0) { gpr_log(GPR_ERROR, "SSL_read returned 0 unexpectedly."); return TSI_INTERNAL_ERROR; } if (read_from_ssl < 0) { read_from_ssl = SSL_get_error(ssl, read_from_ssl); switch (read_from_ssl) { case SSL_ERROR_WANT_READ: /* We need more data to finish the frame. */ *unprotected_bytes_size = 0; return TSI_OK; case SSL_ERROR_WANT_WRITE: gpr_log( GPR_ERROR, "Peer tried to renegotiate SSL connection. This is unsupported."); return TSI_UNIMPLEMENTED; case SSL_ERROR_SSL: gpr_log(GPR_ERROR, "Corruption detected."); log_ssl_error_stack(); return TSI_DATA_CORRUPTED; default: gpr_log(GPR_ERROR, "SSL_read failed with error %s.", ssl_error_string(read_from_ssl)); return TSI_PROTOCOL_FAILURE; } } *unprotected_bytes_size = (size_t)read_from_ssl; return TSI_OK; } /* Performs an SSL_write and handle errors. */ static tsi_result do_ssl_write(SSL *ssl, unsigned char *unprotected_bytes, size_t unprotected_bytes_size) { int ssl_write_result; GPR_ASSERT(unprotected_bytes_size <= INT_MAX); ssl_write_result = SSL_write(ssl, unprotected_bytes, (int)unprotected_bytes_size); if (ssl_write_result < 0) { ssl_write_result = SSL_get_error(ssl, ssl_write_result); if (ssl_write_result == SSL_ERROR_WANT_READ) { gpr_log(GPR_ERROR, "Peer tried to renegotiate SSL connection. This is unsupported."); return TSI_UNIMPLEMENTED; } else { gpr_log(GPR_ERROR, "SSL_write failed with error %s.", ssl_error_string(ssl_write_result)); return TSI_INTERNAL_ERROR; } } return TSI_OK; } /* Loads an in-memory PEM certificate chain into the SSL context. */ static tsi_result ssl_ctx_use_certificate_chain( SSL_CTX *context, const unsigned char *pem_cert_chain, size_t pem_cert_chain_size) { tsi_result result = TSI_OK; X509 *certificate = NULL; BIO *pem; GPR_ASSERT(pem_cert_chain_size <= INT_MAX); pem = BIO_new_mem_buf((void *)pem_cert_chain, (int)pem_cert_chain_size); if (pem == NULL) return TSI_OUT_OF_RESOURCES; do { certificate = PEM_read_bio_X509_AUX(pem, NULL, NULL, ""); if (certificate == NULL) { result = TSI_INVALID_ARGUMENT; break; } if (!SSL_CTX_use_certificate(context, certificate)) { result = TSI_INVALID_ARGUMENT; break; } while (1) { X509 *certificate_authority = PEM_read_bio_X509(pem, NULL, NULL, ""); if (certificate_authority == NULL) { ERR_clear_error(); break; /* Done reading. */ } if (!SSL_CTX_add_extra_chain_cert(context, certificate_authority)) { X509_free(certificate_authority); result = TSI_INVALID_ARGUMENT; break; } /* We don't need to free certificate_authority as its ownership has been transfered to the context. That is not the case for certificate though. */ } } while (0); if (certificate != NULL) X509_free(certificate); BIO_free(pem); return result; } /* Loads an in-memory PEM private key into the SSL context. */ static tsi_result ssl_ctx_use_private_key(SSL_CTX *context, const unsigned char *pem_key, size_t pem_key_size) { tsi_result result = TSI_OK; EVP_PKEY *private_key = NULL; BIO *pem; GPR_ASSERT(pem_key_size <= INT_MAX); pem = BIO_new_mem_buf((void *)pem_key, (int)pem_key_size); if (pem == NULL) return TSI_OUT_OF_RESOURCES; do { private_key = PEM_read_bio_PrivateKey(pem, NULL, NULL, ""); if (private_key == NULL) { result = TSI_INVALID_ARGUMENT; break; } if (!SSL_CTX_use_PrivateKey(context, private_key)) { result = TSI_INVALID_ARGUMENT; break; } } while (0); if (private_key != NULL) EVP_PKEY_free(private_key); BIO_free(pem); return result; } /* Loads in-memory PEM verification certs into the SSL context and optionally returns the verification cert names (root_names can be NULL). */ static tsi_result ssl_ctx_load_verification_certs( SSL_CTX *context, const unsigned char *pem_roots, size_t pem_roots_size, STACK_OF(X509_NAME) * *root_names) { tsi_result result = TSI_OK; size_t num_roots = 0; X509 *root = NULL; X509_NAME *root_name = NULL; BIO *pem; X509_STORE *root_store; GPR_ASSERT(pem_roots_size <= INT_MAX); pem = BIO_new_mem_buf((void *)pem_roots, (int)pem_roots_size); root_store = SSL_CTX_get_cert_store(context); if (root_store == NULL) return TSI_INVALID_ARGUMENT; if (pem == NULL) return TSI_OUT_OF_RESOURCES; if (root_names != NULL) { *root_names = sk_X509_NAME_new_null(); if (*root_names == NULL) return TSI_OUT_OF_RESOURCES; } while (1) { root = PEM_read_bio_X509_AUX(pem, NULL, NULL, ""); if (root == NULL) { ERR_clear_error(); break; /* We're at the end of stream. */ } if (root_names != NULL) { root_name = X509_get_subject_name(root); if (root_name == NULL) { gpr_log(GPR_ERROR, "Could not get name from root certificate."); result = TSI_INVALID_ARGUMENT; break; } root_name = X509_NAME_dup(root_name); if (root_name == NULL) { result = TSI_OUT_OF_RESOURCES; break; } sk_X509_NAME_push(*root_names, root_name); root_name = NULL; } if (!X509_STORE_add_cert(root_store, root)) { gpr_log(GPR_ERROR, "Could not add root certificate to ssl context."); result = TSI_INTERNAL_ERROR; break; } X509_free(root); num_roots++; } if (num_roots == 0) { gpr_log(GPR_ERROR, "Could not load any root certificate."); result = TSI_INVALID_ARGUMENT; } if (result != TSI_OK) { if (root != NULL) X509_free(root); if (root_names != NULL) { sk_X509_NAME_pop_free(*root_names, X509_NAME_free); *root_names = NULL; if (root_name != NULL) X509_NAME_free(root_name); } } BIO_free(pem); return result; } /* Populates the SSL context with a private key and a cert chain, and sets the cipher list and the ephemeral ECDH key. */ static tsi_result populate_ssl_context( SSL_CTX *context, const unsigned char *pem_private_key, size_t pem_private_key_size, const unsigned char *pem_certificate_chain, size_t pem_certificate_chain_size, const char *cipher_list) { tsi_result result = TSI_OK; if (pem_certificate_chain != NULL) { result = ssl_ctx_use_certificate_chain(context, pem_certificate_chain, pem_certificate_chain_size); if (result != TSI_OK) { gpr_log(GPR_ERROR, "Invalid cert chain file."); return result; } } if (pem_private_key != NULL) { result = ssl_ctx_use_private_key(context, pem_private_key, pem_private_key_size); if (result != TSI_OK || !SSL_CTX_check_private_key(context)) { gpr_log(GPR_ERROR, "Invalid private key."); return result != TSI_OK ? result : TSI_INVALID_ARGUMENT; } } if ((cipher_list != NULL) && !SSL_CTX_set_cipher_list(context, cipher_list)) { gpr_log(GPR_ERROR, "Invalid cipher list: %s.", cipher_list); return TSI_INVALID_ARGUMENT; } { EC_KEY *ecdh = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1); if (!SSL_CTX_set_tmp_ecdh(context, ecdh)) { gpr_log(GPR_ERROR, "Could not set ephemeral ECDH key."); EC_KEY_free(ecdh); return TSI_INTERNAL_ERROR; } SSL_CTX_set_options(context, SSL_OP_SINGLE_ECDH_USE); EC_KEY_free(ecdh); } return TSI_OK; } /* Extracts the CN and the SANs from an X509 cert as a peer object. */ static tsi_result extract_x509_subject_names_from_pem_cert( const unsigned char *pem_cert, size_t pem_cert_size, tsi_peer *peer) { tsi_result result = TSI_OK; X509 *cert = NULL; BIO *pem; GPR_ASSERT(pem_cert_size <= INT_MAX); pem = BIO_new_mem_buf((void *)pem_cert, (int)pem_cert_size); if (pem == NULL) return TSI_OUT_OF_RESOURCES; cert = PEM_read_bio_X509(pem, NULL, NULL, ""); if (cert == NULL) { gpr_log(GPR_ERROR, "Invalid certificate"); result = TSI_INVALID_ARGUMENT; } else { result = peer_from_x509(cert, 0, peer); } if (cert != NULL) X509_free(cert); BIO_free(pem); return result; } /* Builds the alpn protocol name list according to rfc 7301. */ static tsi_result build_alpn_protocol_name_list( const unsigned char **alpn_protocols, const unsigned char *alpn_protocols_lengths, uint16_t num_alpn_protocols, unsigned char **protocol_name_list, size_t *protocol_name_list_length) { uint16_t i; unsigned char *current; *protocol_name_list = NULL; *protocol_name_list_length = 0; if (num_alpn_protocols == 0) return TSI_INVALID_ARGUMENT; for (i = 0; i < num_alpn_protocols; i++) { if (alpn_protocols_lengths[i] == 0) { gpr_log(GPR_ERROR, "Invalid 0-length protocol name."); return TSI_INVALID_ARGUMENT; } *protocol_name_list_length += (size_t)alpn_protocols_lengths[i] + 1; } *protocol_name_list = malloc(*protocol_name_list_length); if (*protocol_name_list == NULL) return TSI_OUT_OF_RESOURCES; current = *protocol_name_list; for (i = 0; i < num_alpn_protocols; i++) { *(current++) = alpn_protocols_lengths[i]; memcpy(current, alpn_protocols[i], alpn_protocols_lengths[i]); current += alpn_protocols_lengths[i]; } /* Safety check. */ if ((current < *protocol_name_list) || ((uintptr_t)(current - *protocol_name_list) != *protocol_name_list_length)) { return TSI_INTERNAL_ERROR; } return TSI_OK; } /* --- tsi_frame_protector methods implementation. ---*/ static tsi_result ssl_protector_protect(tsi_frame_protector *self, const unsigned char *unprotected_bytes, size_t *unprotected_bytes_size, unsigned char *protected_output_frames, size_t *protected_output_frames_size) { tsi_ssl_frame_protector *impl = (tsi_ssl_frame_protector *)self; int read_from_ssl; size_t available; tsi_result result = TSI_OK; /* First see if we have some pending data in the SSL BIO. */ int pending_in_ssl = (int)BIO_pending(impl->from_ssl); if (pending_in_ssl > 0) { *unprotected_bytes_size = 0; GPR_ASSERT(*protected_output_frames_size <= INT_MAX); read_from_ssl = BIO_read(impl->from_ssl, protected_output_frames, (int)*protected_output_frames_size); if (read_from_ssl < 0) { gpr_log(GPR_ERROR, "Could not read from BIO even though some data is pending"); return TSI_INTERNAL_ERROR; } *protected_output_frames_size = (size_t)read_from_ssl; return TSI_OK; } /* Now see if we can send a complete frame. */ available = impl->buffer_size - impl->buffer_offset; if (available > *unprotected_bytes_size) { /* If we cannot, just copy the data in our internal buffer. */ memcpy(impl->buffer + impl->buffer_offset, unprotected_bytes, *unprotected_bytes_size); impl->buffer_offset += *unprotected_bytes_size; *protected_output_frames_size = 0; return TSI_OK; } /* If we can, prepare the buffer, send it to SSL_write and read. */ memcpy(impl->buffer + impl->buffer_offset, unprotected_bytes, available); result = do_ssl_write(impl->ssl, impl->buffer, impl->buffer_size); if (result != TSI_OK) return result; GPR_ASSERT(*protected_output_frames_size <= INT_MAX); read_from_ssl = BIO_read(impl->from_ssl, protected_output_frames, (int)*protected_output_frames_size); if (read_from_ssl < 0) { gpr_log(GPR_ERROR, "Could not read from BIO after SSL_write."); return TSI_INTERNAL_ERROR; } *protected_output_frames_size = (size_t)read_from_ssl; *unprotected_bytes_size = available; impl->buffer_offset = 0; return TSI_OK; } static tsi_result ssl_protector_protect_flush( tsi_frame_protector *self, unsigned char *protected_output_frames, size_t *protected_output_frames_size, size_t *still_pending_size) { tsi_result result = TSI_OK; tsi_ssl_frame_protector *impl = (tsi_ssl_frame_protector *)self; int read_from_ssl = 0; int pending; if (impl->buffer_offset != 0) { result = do_ssl_write(impl->ssl, impl->buffer, impl->buffer_offset); if (result != TSI_OK) return result; impl->buffer_offset = 0; } pending = (int)BIO_pending(impl->from_ssl); GPR_ASSERT(pending >= 0); *still_pending_size = (size_t)pending; if (*still_pending_size == 0) return TSI_OK; GPR_ASSERT(*protected_output_frames_size <= INT_MAX); read_from_ssl = BIO_read(impl->from_ssl, protected_output_frames, (int)*protected_output_frames_size); if (read_from_ssl <= 0) { gpr_log(GPR_ERROR, "Could not read from BIO after SSL_write."); return TSI_INTERNAL_ERROR; } *protected_output_frames_size = (size_t)read_from_ssl; pending = (int)BIO_pending(impl->from_ssl); GPR_ASSERT(pending >= 0); *still_pending_size = (size_t)pending; return TSI_OK; } static tsi_result ssl_protector_unprotect( tsi_frame_protector *self, const unsigned char *protected_frames_bytes, size_t *protected_frames_bytes_size, unsigned char *unprotected_bytes, size_t *unprotected_bytes_size) { tsi_result result = TSI_OK; int written_into_ssl = 0; size_t output_bytes_size = *unprotected_bytes_size; size_t output_bytes_offset = 0; tsi_ssl_frame_protector *impl = (tsi_ssl_frame_protector *)self; /* First, try to read remaining data from ssl. */ result = do_ssl_read(impl->ssl, unprotected_bytes, unprotected_bytes_size); if (result != TSI_OK) return result; if (*unprotected_bytes_size == output_bytes_size) { /* We have read everything we could and cannot process any more input. */ *protected_frames_bytes_size = 0; return TSI_OK; } output_bytes_offset = *unprotected_bytes_size; unprotected_bytes += output_bytes_offset; *unprotected_bytes_size = output_bytes_size - output_bytes_offset; /* Then, try to write some data to ssl. */ GPR_ASSERT(*protected_frames_bytes_size <= INT_MAX); written_into_ssl = BIO_write(impl->into_ssl, protected_frames_bytes, (int)*protected_frames_bytes_size); if (written_into_ssl < 0) { gpr_log(GPR_ERROR, "Sending protected frame to ssl failed with %d", written_into_ssl); return TSI_INTERNAL_ERROR; } *protected_frames_bytes_size = (size_t)written_into_ssl; /* Now try to read some data again. */ result = do_ssl_read(impl->ssl, unprotected_bytes, unprotected_bytes_size); if (result == TSI_OK) { /* Don't forget to output the total number of bytes read. */ *unprotected_bytes_size += output_bytes_offset; } return result; } static void ssl_protector_destroy(tsi_frame_protector *self) { tsi_ssl_frame_protector *impl = (tsi_ssl_frame_protector *)self; if (impl->buffer != NULL) free(impl->buffer); if (impl->ssl != NULL) SSL_free(impl->ssl); free(self); } static const tsi_frame_protector_vtable frame_protector_vtable = { ssl_protector_protect, ssl_protector_protect_flush, ssl_protector_unprotect, ssl_protector_destroy, }; /* --- tsi_handshaker methods implementation. ---*/ static tsi_result ssl_handshaker_get_bytes_to_send_to_peer(tsi_handshaker *self, unsigned char *bytes, size_t *bytes_size) { tsi_ssl_handshaker *impl = (tsi_ssl_handshaker *)self; int bytes_read_from_ssl = 0; if (bytes == NULL || bytes_size == NULL || *bytes_size == 0 || *bytes_size > INT_MAX) { return TSI_INVALID_ARGUMENT; } GPR_ASSERT(*bytes_size <= INT_MAX); bytes_read_from_ssl = BIO_read(impl->from_ssl, bytes, (int)*bytes_size); if (bytes_read_from_ssl < 0) { *bytes_size = 0; if (!BIO_should_retry(impl->from_ssl)) { impl->result = TSI_INTERNAL_ERROR; return impl->result; } else { return TSI_OK; } } *bytes_size = (size_t)bytes_read_from_ssl; return BIO_pending(impl->from_ssl) == 0 ? TSI_OK : TSI_INCOMPLETE_DATA; } static tsi_result ssl_handshaker_get_result(tsi_handshaker *self) { tsi_ssl_handshaker *impl = (tsi_ssl_handshaker *)self; if ((impl->result == TSI_HANDSHAKE_IN_PROGRESS) && SSL_is_init_finished(impl->ssl)) { impl->result = TSI_OK; } return impl->result; } static tsi_result ssl_handshaker_process_bytes_from_peer( tsi_handshaker *self, const unsigned char *bytes, size_t *bytes_size) { tsi_ssl_handshaker *impl = (tsi_ssl_handshaker *)self; int bytes_written_into_ssl_size = 0; if (bytes == NULL || bytes_size == 0 || *bytes_size > INT_MAX) { return TSI_INVALID_ARGUMENT; } GPR_ASSERT(*bytes_size <= INT_MAX); bytes_written_into_ssl_size = BIO_write(impl->into_ssl, bytes, (int)*bytes_size); if (bytes_written_into_ssl_size < 0) { gpr_log(GPR_ERROR, "Could not write to memory BIO."); impl->result = TSI_INTERNAL_ERROR; return impl->result; } *bytes_size = (size_t)bytes_written_into_ssl_size; if (!tsi_handshaker_is_in_progress(self)) { impl->result = TSI_OK; return impl->result; } else { /* Get ready to get some bytes from SSL. */ int ssl_result = SSL_do_handshake(impl->ssl); ssl_result = SSL_get_error(impl->ssl, ssl_result); switch (ssl_result) { case SSL_ERROR_WANT_READ: if (BIO_pending(impl->from_ssl) == 0) { /* We need more data. */ return TSI_INCOMPLETE_DATA; } else { return TSI_OK; } case SSL_ERROR_NONE: return TSI_OK; default: { char err_str[256]; ERR_error_string_n(ERR_get_error(), err_str, sizeof(err_str)); gpr_log(GPR_ERROR, "Handshake failed with fatal error %s: %s.", ssl_error_string(ssl_result), err_str); impl->result = TSI_PROTOCOL_FAILURE; return impl->result; } } } } static tsi_result ssl_handshaker_extract_peer(tsi_handshaker *self, tsi_peer *peer) { tsi_result result = TSI_OK; const unsigned char *alpn_selected = NULL; unsigned int alpn_selected_len; tsi_ssl_handshaker *impl = (tsi_ssl_handshaker *)self; X509 *peer_cert = SSL_get_peer_certificate(impl->ssl); if (peer_cert != NULL) { result = peer_from_x509(peer_cert, 1, peer); X509_free(peer_cert); if (result != TSI_OK) return result; } #if TSI_OPENSSL_ALPN_SUPPORT SSL_get0_alpn_selected(impl->ssl, &alpn_selected, &alpn_selected_len); #endif /* TSI_OPENSSL_ALPN_SUPPORT */ if (alpn_selected == NULL) { /* Try npn. */ SSL_get0_next_proto_negotiated(impl->ssl, &alpn_selected, &alpn_selected_len); } if (alpn_selected != NULL) { size_t i; tsi_peer_property *new_properties = calloc(1, sizeof(tsi_peer_property) * (peer->property_count + 1)); if (new_properties == NULL) return TSI_OUT_OF_RESOURCES; for (i = 0; i < peer->property_count; i++) { new_properties[i] = peer->properties[i]; } result = tsi_construct_string_peer_property( TSI_SSL_ALPN_SELECTED_PROTOCOL, (const char *)alpn_selected, alpn_selected_len, &new_properties[peer->property_count]); if (result != TSI_OK) { free(new_properties); return result; } if (peer->properties != NULL) free(peer->properties); peer->property_count++; peer->properties = new_properties; } return result; } static tsi_result ssl_handshaker_create_frame_protector( tsi_handshaker *self, size_t *max_output_protected_frame_size, tsi_frame_protector **protector) { size_t actual_max_output_protected_frame_size = TSI_SSL_MAX_PROTECTED_FRAME_SIZE_UPPER_BOUND; tsi_ssl_handshaker *impl = (tsi_ssl_handshaker *)self; tsi_ssl_frame_protector *protector_impl = calloc(1, sizeof(tsi_ssl_frame_protector)); if (protector_impl == NULL) { return TSI_OUT_OF_RESOURCES; } if (max_output_protected_frame_size != NULL) { if (*max_output_protected_frame_size > TSI_SSL_MAX_PROTECTED_FRAME_SIZE_UPPER_BOUND) { *max_output_protected_frame_size = TSI_SSL_MAX_PROTECTED_FRAME_SIZE_UPPER_BOUND; } else if (*max_output_protected_frame_size < TSI_SSL_MAX_PROTECTED_FRAME_SIZE_LOWER_BOUND) { *max_output_protected_frame_size = TSI_SSL_MAX_PROTECTED_FRAME_SIZE_LOWER_BOUND; } actual_max_output_protected_frame_size = *max_output_protected_frame_size; } protector_impl->buffer_size = actual_max_output_protected_frame_size - TSI_SSL_MAX_PROTECTION_OVERHEAD; protector_impl->buffer = malloc(protector_impl->buffer_size); if (protector_impl->buffer == NULL) { gpr_log(GPR_ERROR, "Could not allocated buffer for tsi_ssl_frame_protector."); free(protector_impl); return TSI_INTERNAL_ERROR; } /* Transfer ownership of ssl to the frame protector. It is OK as the caller * cannot call anything else but destroy on the handshaker after this call. */ protector_impl->ssl = impl->ssl; impl->ssl = NULL; protector_impl->into_ssl = impl->into_ssl; protector_impl->from_ssl = impl->from_ssl; protector_impl->base.vtable = &frame_protector_vtable; *protector = &protector_impl->base; return TSI_OK; } static void ssl_handshaker_destroy(tsi_handshaker *self) { tsi_ssl_handshaker *impl = (tsi_ssl_handshaker *)self; SSL_free(impl->ssl); /* The BIO objects are owned by ssl */ free(impl); } static const tsi_handshaker_vtable handshaker_vtable = { ssl_handshaker_get_bytes_to_send_to_peer, ssl_handshaker_process_bytes_from_peer, ssl_handshaker_get_result, ssl_handshaker_extract_peer, ssl_handshaker_create_frame_protector, ssl_handshaker_destroy, }; /* --- tsi_ssl_handshaker_factory common methods. --- */ tsi_result tsi_ssl_handshaker_factory_create_handshaker( tsi_ssl_handshaker_factory *self, const char *server_name_indication, tsi_handshaker **handshaker) { if (self == NULL || handshaker == NULL) return TSI_INVALID_ARGUMENT; return self->create_handshaker(self, server_name_indication, handshaker); } void tsi_ssl_handshaker_factory_destroy(tsi_ssl_handshaker_factory *self) { if (self == NULL) return; self->destroy(self); } static tsi_result create_tsi_ssl_handshaker(SSL_CTX *ctx, int is_client, const char *server_name_indication, tsi_handshaker **handshaker) { SSL *ssl = SSL_new(ctx); BIO *into_ssl = NULL; BIO *from_ssl = NULL; tsi_ssl_handshaker *impl = NULL; *handshaker = NULL; if (ctx == NULL) { gpr_log(GPR_ERROR, "SSL Context is null. Should never happen."); return TSI_INTERNAL_ERROR; } if (ssl == NULL) { return TSI_OUT_OF_RESOURCES; } SSL_set_info_callback(ssl, ssl_info_callback); into_ssl = BIO_new(BIO_s_mem()); from_ssl = BIO_new(BIO_s_mem()); if (into_ssl == NULL || from_ssl == NULL) { gpr_log(GPR_ERROR, "BIO_new failed."); SSL_free(ssl); if (into_ssl != NULL) BIO_free(into_ssl); if (from_ssl != NULL) BIO_free(into_ssl); return TSI_OUT_OF_RESOURCES; } SSL_set_bio(ssl, into_ssl, from_ssl); if (is_client) { int ssl_result; SSL_set_connect_state(ssl); if (server_name_indication != NULL) { if (!SSL_set_tlsext_host_name(ssl, server_name_indication)) { gpr_log(GPR_ERROR, "Invalid server name indication %s.", server_name_indication); SSL_free(ssl); return TSI_INTERNAL_ERROR; } } ssl_result = SSL_do_handshake(ssl); ssl_result = SSL_get_error(ssl, ssl_result); if (ssl_result != SSL_ERROR_WANT_READ) { gpr_log(GPR_ERROR, "Unexpected error received from first SSL_do_handshake call: %s", ssl_error_string(ssl_result)); SSL_free(ssl); return TSI_INTERNAL_ERROR; } } else { SSL_set_accept_state(ssl); } impl = calloc(1, sizeof(tsi_ssl_handshaker)); if (impl == NULL) { SSL_free(ssl); return TSI_OUT_OF_RESOURCES; } impl->ssl = ssl; impl->into_ssl = into_ssl; impl->from_ssl = from_ssl; impl->result = TSI_HANDSHAKE_IN_PROGRESS; impl->base.vtable = &handshaker_vtable; *handshaker = &impl->base; return TSI_OK; } static int select_protocol_list(const unsigned char **out, unsigned char *outlen, const unsigned char *client_list, size_t client_list_len, const unsigned char *server_list, size_t server_list_len) { const unsigned char *client_current = client_list; while ((unsigned int)(client_current - client_list) < client_list_len) { unsigned char client_current_len = *(client_current++); const unsigned char *server_current = server_list; while ((server_current >= server_list) && (uintptr_t)(server_current - server_list) < server_list_len) { unsigned char server_current_len = *(server_current++); if ((client_current_len == server_current_len) && !memcmp(client_current, server_current, server_current_len)) { *out = server_current; *outlen = server_current_len; return SSL_TLSEXT_ERR_OK; } server_current += server_current_len; } client_current += client_current_len; } return SSL_TLSEXT_ERR_NOACK; } /* --- tsi_ssl__client_handshaker_factory methods implementation. --- */ static tsi_result ssl_client_handshaker_factory_create_handshaker( tsi_ssl_handshaker_factory *self, const char *server_name_indication, tsi_handshaker **handshaker) { tsi_ssl_client_handshaker_factory *impl = (tsi_ssl_client_handshaker_factory *)self; return create_tsi_ssl_handshaker(impl->ssl_context, 1, server_name_indication, handshaker); } static void ssl_client_handshaker_factory_destroy( tsi_ssl_handshaker_factory *self) { tsi_ssl_client_handshaker_factory *impl = (tsi_ssl_client_handshaker_factory *)self; if (impl->ssl_context != NULL) SSL_CTX_free(impl->ssl_context); if (impl->alpn_protocol_list != NULL) free(impl->alpn_protocol_list); free(impl); } static int client_handshaker_factory_npn_callback(SSL *ssl, unsigned char **out, unsigned char *outlen, const unsigned char *in, unsigned int inlen, void *arg) { tsi_ssl_client_handshaker_factory *factory = (tsi_ssl_client_handshaker_factory *)arg; return select_protocol_list((const unsigned char **)out, outlen, factory->alpn_protocol_list, factory->alpn_protocol_list_length, in, inlen); } /* --- tsi_ssl_server_handshaker_factory methods implementation. --- */ static tsi_result ssl_server_handshaker_factory_create_handshaker( tsi_ssl_handshaker_factory *self, const char *server_name_indication, tsi_handshaker **handshaker) { tsi_ssl_server_handshaker_factory *impl = (tsi_ssl_server_handshaker_factory *)self; if (impl->ssl_context_count == 0 || server_name_indication != NULL) { return TSI_INVALID_ARGUMENT; } /* Create the handshaker with the first context. We will switch if needed because of SNI in ssl_server_handshaker_factory_servername_callback. */ return create_tsi_ssl_handshaker(impl->ssl_contexts[0], 0, NULL, handshaker); } static void ssl_server_handshaker_factory_destroy( tsi_ssl_handshaker_factory *self) { tsi_ssl_server_handshaker_factory *impl = (tsi_ssl_server_handshaker_factory *)self; size_t i; for (i = 0; i < impl->ssl_context_count; i++) { if (impl->ssl_contexts[i] != NULL) { SSL_CTX_free(impl->ssl_contexts[i]); tsi_peer_destruct(&impl->ssl_context_x509_subject_names[i]); } } if (impl->ssl_contexts != NULL) free(impl->ssl_contexts); if (impl->ssl_context_x509_subject_names != NULL) { free(impl->ssl_context_x509_subject_names); } if (impl->alpn_protocol_list != NULL) free(impl->alpn_protocol_list); free(impl); } static int does_entry_match_name(const char *entry, size_t entry_length, const char *name) { const char *dot; const char *name_subdomain = NULL; size_t name_length = strlen(name); size_t name_subdomain_length; if (entry_length == 0) return 0; /* Take care of '.' terminations. */ if (name[name_length - 1] == '.') { name_length--; } if (entry[entry_length - 1] == '.') { entry_length--; if (entry_length == 0) return 0; } if ((name_length == entry_length) && strncmp(name, entry, entry_length) == 0) { return 1; /* Perfect match. */ } if (entry[0] != '*') return 0; /* Wildchar subdomain matching. */ if (entry_length < 3 || entry[1] != '.') { /* At least *.x */ gpr_log(GPR_ERROR, "Invalid wildchar entry."); return 0; } name_subdomain = strchr(name, '.'); if (name_subdomain == NULL) return 0; name_subdomain_length = strlen(name_subdomain); if (name_subdomain_length < 2) return 0; name_subdomain++; /* Starts after the dot. */ name_subdomain_length--; entry += 2; /* Remove *. */ entry_length -= 2; dot = strchr(name_subdomain, '.'); if ((dot == NULL) || (dot == &name_subdomain[name_subdomain_length - 1])) { gpr_log(GPR_ERROR, "Invalid toplevel subdomain: %s", name_subdomain); return 0; } if (name_subdomain[name_subdomain_length - 1] == '.') { name_subdomain_length--; } return ((entry_length > 0) && (name_subdomain_length == entry_length) && strncmp(entry, name_subdomain, entry_length) == 0); } static int ssl_server_handshaker_factory_servername_callback(SSL *ssl, int *ap, void *arg) { tsi_ssl_server_handshaker_factory *impl = (tsi_ssl_server_handshaker_factory *)arg; size_t i = 0; const char *servername = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name); if (servername == NULL || strlen(servername) == 0) { return SSL_TLSEXT_ERR_NOACK; } for (i = 0; i < impl->ssl_context_count; i++) { if (tsi_ssl_peer_matches_name(&impl->ssl_context_x509_subject_names[i], servername)) { SSL_set_SSL_CTX(ssl, impl->ssl_contexts[i]); return SSL_TLSEXT_ERR_OK; } } gpr_log(GPR_ERROR, "No match found for server name: %s.", servername); return SSL_TLSEXT_ERR_ALERT_WARNING; } #if TSI_OPENSSL_ALPN_SUPPORT static int server_handshaker_factory_alpn_callback( SSL *ssl, const unsigned char **out, unsigned char *outlen, const unsigned char *in, unsigned int inlen, void *arg) { tsi_ssl_server_handshaker_factory *factory = (tsi_ssl_server_handshaker_factory *)arg; return select_protocol_list(out, outlen, in, inlen, factory->alpn_protocol_list, factory->alpn_protocol_list_length); } #endif /* TSI_OPENSSL_ALPN_SUPPORT */ static int server_handshaker_factory_npn_advertised_callback( SSL *ssl, const unsigned char **out, unsigned int *outlen, void *arg) { tsi_ssl_server_handshaker_factory *factory = (tsi_ssl_server_handshaker_factory *)arg; *out = factory->alpn_protocol_list; GPR_ASSERT(factory->alpn_protocol_list_length <= UINT_MAX); *outlen = (unsigned int)factory->alpn_protocol_list_length; return SSL_TLSEXT_ERR_OK; } /* --- tsi_ssl_handshaker_factory constructors. --- */ tsi_result tsi_create_ssl_client_handshaker_factory( const unsigned char *pem_private_key, size_t pem_private_key_size, const unsigned char *pem_cert_chain, size_t pem_cert_chain_size, const unsigned char *pem_root_certs, size_t pem_root_certs_size, const char *cipher_list, const unsigned char **alpn_protocols, const unsigned char *alpn_protocols_lengths, uint16_t num_alpn_protocols, tsi_ssl_handshaker_factory **factory) { SSL_CTX *ssl_context = NULL; tsi_ssl_client_handshaker_factory *impl = NULL; tsi_result result = TSI_OK; gpr_once_init(&init_openssl_once, init_openssl); if (factory == NULL) return TSI_INVALID_ARGUMENT; *factory = NULL; if (pem_root_certs == NULL) return TSI_INVALID_ARGUMENT; ssl_context = SSL_CTX_new(TLSv1_2_method()); if (ssl_context == NULL) { gpr_log(GPR_ERROR, "Could not create ssl context."); return TSI_INVALID_ARGUMENT; } impl = calloc(1, sizeof(tsi_ssl_client_handshaker_factory)); if (impl == NULL) { SSL_CTX_free(ssl_context); return TSI_OUT_OF_RESOURCES; } impl->ssl_context = ssl_context; do { result = populate_ssl_context(ssl_context, pem_private_key, pem_private_key_size, pem_cert_chain, pem_cert_chain_size, cipher_list); if (result != TSI_OK) break; result = ssl_ctx_load_verification_certs(ssl_context, pem_root_certs, pem_root_certs_size, NULL); if (result != TSI_OK) { gpr_log(GPR_ERROR, "Cannot load server root certificates."); break; } if (num_alpn_protocols != 0) { result = build_alpn_protocol_name_list( alpn_protocols, alpn_protocols_lengths, num_alpn_protocols, &impl->alpn_protocol_list, &impl->alpn_protocol_list_length); if (result != TSI_OK) { gpr_log(GPR_ERROR, "Building alpn list failed with error %s.", tsi_result_to_string(result)); break; } #if TSI_OPENSSL_ALPN_SUPPORT GPR_ASSERT(impl->alpn_protocol_list_length < UINT_MAX); if (SSL_CTX_set_alpn_protos( ssl_context, impl->alpn_protocol_list, (unsigned int)impl->alpn_protocol_list_length)) { gpr_log(GPR_ERROR, "Could not set alpn protocol list to context."); result = TSI_INVALID_ARGUMENT; break; } #endif /* TSI_OPENSSL_ALPN_SUPPORT */ SSL_CTX_set_next_proto_select_cb( ssl_context, client_handshaker_factory_npn_callback, impl); } } while (0); if (result != TSI_OK) { ssl_client_handshaker_factory_destroy(&impl->base); return result; } SSL_CTX_set_verify(ssl_context, SSL_VERIFY_PEER, NULL); /* TODO(jboeuf): Add revocation verification. */ impl->base.create_handshaker = ssl_client_handshaker_factory_create_handshaker; impl->base.destroy = ssl_client_handshaker_factory_destroy; *factory = &impl->base; return TSI_OK; } tsi_result tsi_create_ssl_server_handshaker_factory( const unsigned char **pem_private_keys, const size_t *pem_private_keys_sizes, const unsigned char **pem_cert_chains, const size_t *pem_cert_chains_sizes, size_t key_cert_pair_count, const unsigned char *pem_client_root_certs, size_t pem_client_root_certs_size, int force_client_auth, const char *cipher_list, const unsigned char **alpn_protocols, const unsigned char *alpn_protocols_lengths, uint16_t num_alpn_protocols, tsi_ssl_handshaker_factory **factory) { tsi_ssl_server_handshaker_factory *impl = NULL; tsi_result result = TSI_OK; size_t i = 0; gpr_once_init(&init_openssl_once, init_openssl); if (factory == NULL) return TSI_INVALID_ARGUMENT; *factory = NULL; if (key_cert_pair_count == 0 || pem_private_keys == NULL || pem_cert_chains == NULL) { return TSI_INVALID_ARGUMENT; } impl = calloc(1, sizeof(tsi_ssl_server_handshaker_factory)); if (impl == NULL) return TSI_OUT_OF_RESOURCES; impl->base.create_handshaker = ssl_server_handshaker_factory_create_handshaker; impl->base.destroy = ssl_server_handshaker_factory_destroy; impl->ssl_contexts = calloc(key_cert_pair_count, sizeof(SSL_CTX *)); impl->ssl_context_x509_subject_names = calloc(key_cert_pair_count, sizeof(tsi_peer)); if (impl->ssl_contexts == NULL || impl->ssl_context_x509_subject_names == NULL) { tsi_ssl_handshaker_factory_destroy(&impl->base); return TSI_OUT_OF_RESOURCES; } impl->ssl_context_count = key_cert_pair_count; if (num_alpn_protocols > 0) { result = build_alpn_protocol_name_list( alpn_protocols, alpn_protocols_lengths, num_alpn_protocols, &impl->alpn_protocol_list, &impl->alpn_protocol_list_length); if (result != TSI_OK) { tsi_ssl_handshaker_factory_destroy(&impl->base); return result; } } for (i = 0; i < key_cert_pair_count; i++) { do { impl->ssl_contexts[i] = SSL_CTX_new(TLSv1_2_method()); if (impl->ssl_contexts[i] == NULL) { gpr_log(GPR_ERROR, "Could not create ssl context."); result = TSI_OUT_OF_RESOURCES; break; } result = populate_ssl_context( impl->ssl_contexts[i], pem_private_keys[i], pem_private_keys_sizes[i], pem_cert_chains[i], pem_cert_chains_sizes[i], cipher_list); if (result != TSI_OK) break; if (pem_client_root_certs != NULL) { int flags = SSL_VERIFY_PEER; STACK_OF(X509_NAME) *root_names = NULL; result = ssl_ctx_load_verification_certs( impl->ssl_contexts[i], pem_client_root_certs, pem_client_root_certs_size, &root_names); if (result != TSI_OK) { gpr_log(GPR_ERROR, "Invalid verification certs."); break; } SSL_CTX_set_client_CA_list(impl->ssl_contexts[i], root_names); if (force_client_auth) flags |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT; SSL_CTX_set_verify(impl->ssl_contexts[i], flags, NULL); /* TODO(jboeuf): Add revocation verification. */ } result = extract_x509_subject_names_from_pem_cert( pem_cert_chains[i], pem_cert_chains_sizes[i], &impl->ssl_context_x509_subject_names[i]); if (result != TSI_OK) break; SSL_CTX_set_tlsext_servername_callback( impl->ssl_contexts[i], ssl_server_handshaker_factory_servername_callback); SSL_CTX_set_tlsext_servername_arg(impl->ssl_contexts[i], impl); #if TSI_OPENSSL_ALPN_SUPPORT SSL_CTX_set_alpn_select_cb(impl->ssl_contexts[i], server_handshaker_factory_alpn_callback, impl); #endif /* TSI_OPENSSL_ALPN_SUPPORT */ SSL_CTX_set_next_protos_advertised_cb( impl->ssl_contexts[i], server_handshaker_factory_npn_advertised_callback, impl); } while (0); if (result != TSI_OK) { tsi_ssl_handshaker_factory_destroy(&impl->base); return result; } } *factory = &impl->base; return TSI_OK; } /* --- tsi_ssl utils. --- */ int tsi_ssl_peer_matches_name(const tsi_peer *peer, const char *name) { size_t i = 0; size_t san_count = 0; const tsi_peer_property *cn_property = NULL; int like_ip = looks_like_ip_address(name); /* Check the SAN first. */ for (i = 0; i < peer->property_count; i++) { const tsi_peer_property *property = &peer->properties[i]; if (property->name == NULL) continue; if (strcmp(property->name, TSI_X509_SUBJECT_ALTERNATIVE_NAME_PEER_PROPERTY) == 0) { san_count++; if (!like_ip && does_entry_match_name(property->value.data, property->value.length, name)) { return 1; } else if (like_ip && strncmp(name, property->value.data, property->value.length) == 0 && strlen(name) == property->value.length) { /* IP Addresses are exact matches only. */ return 1; } } else if (strcmp(property->name, TSI_X509_SUBJECT_COMMON_NAME_PEER_PROPERTY) == 0) { cn_property = property; } } /* If there's no SAN, try the CN, but only if its not like an IP Address */ if (san_count == 0 && cn_property != NULL && !like_ip) { if (does_entry_match_name(cn_property->value.data, cn_property->value.length, name)) { return 1; } } return 0; /* Not found. */ }