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Diffstat (limited to 'src/core/lib/security/security_connector.c')
| -rw-r--r-- | src/core/lib/security/security_connector.c | 812 |
1 files changed, 812 insertions, 0 deletions
diff --git a/src/core/lib/security/security_connector.c b/src/core/lib/security/security_connector.c new file mode 100644 index 0000000000..5474bc3a9e --- /dev/null +++ b/src/core/lib/security/security_connector.c @@ -0,0 +1,812 @@ +/* + * + * Copyright 2015-2016, 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/security/security_connector.h" + +#include <stdbool.h> +#include <string.h> + +#include <grpc/support/alloc.h> +#include <grpc/support/host_port.h> +#include <grpc/support/log.h> +#include <grpc/support/slice_buffer.h> +#include <grpc/support/string_util.h> + +#include "src/core/lib/security/credentials.h" +#include "src/core/lib/security/handshake.h" +#include "src/core/lib/security/secure_endpoint.h" +#include "src/core/lib/security/security_context.h" +#include "src/core/lib/support/env.h" +#include "src/core/lib/support/load_file.h" +#include "src/core/lib/support/string.h" +#include "src/core/lib/transport/chttp2/alpn.h" +#include "src/core/lib/tsi/fake_transport_security.h" +#include "src/core/lib/tsi/ssl_transport_security.h" + +/* -- Constants. -- */ + +#ifndef INSTALL_PREFIX +static const char *installed_roots_path = "/usr/share/grpc/roots.pem"; +#else +static const char *installed_roots_path = + INSTALL_PREFIX "/share/grpc/roots.pem"; +#endif + +/* -- Overridden default roots. -- */ + +static grpc_ssl_roots_override_callback ssl_roots_override_cb = NULL; + +void grpc_set_ssl_roots_override_callback(grpc_ssl_roots_override_callback cb) { + ssl_roots_override_cb = cb; +} + +/* -- Cipher suites. -- */ + +/* Defines the cipher suites that we accept by default. All these cipher suites + are compliant with HTTP2. */ +#define GRPC_SSL_CIPHER_SUITES \ + "ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-" \ + "SHA384:ECDHE-RSA-AES256-GCM-SHA384" + +static gpr_once cipher_suites_once = GPR_ONCE_INIT; +static const char *cipher_suites = NULL; + +static void init_cipher_suites(void) { + char *overridden = gpr_getenv("GRPC_SSL_CIPHER_SUITES"); + cipher_suites = overridden != NULL ? overridden : GRPC_SSL_CIPHER_SUITES; +} + +static const char *ssl_cipher_suites(void) { + gpr_once_init(&cipher_suites_once, init_cipher_suites); + return cipher_suites; +} + +/* -- Common methods. -- */ + +/* Returns the first property with that name. */ +const tsi_peer_property *tsi_peer_get_property_by_name(const tsi_peer *peer, + const char *name) { + size_t i; + if (peer == NULL) return NULL; + for (i = 0; i < peer->property_count; i++) { + const tsi_peer_property *property = &peer->properties[i]; + if (name == NULL && property->name == NULL) { + return property; + } + if (name != NULL && property->name != NULL && + strcmp(property->name, name) == 0) { + return property; + } + } + return NULL; +} + +void grpc_server_security_connector_shutdown( + grpc_exec_ctx *exec_ctx, grpc_server_security_connector *connector) { + grpc_security_connector_handshake_list *tmp; + gpr_mu_lock(&connector->mu); + while (connector->handshaking_handshakes) { + tmp = connector->handshaking_handshakes; + grpc_security_handshake_shutdown( + exec_ctx, connector->handshaking_handshakes->handshake); + connector->handshaking_handshakes = tmp->next; + gpr_free(tmp); + } + gpr_mu_unlock(&connector->mu); +} + +void grpc_channel_security_connector_do_handshake( + grpc_exec_ctx *exec_ctx, grpc_channel_security_connector *sc, + grpc_endpoint *nonsecure_endpoint, grpc_security_handshake_done_cb cb, + void *user_data) { + if (sc == NULL || nonsecure_endpoint == NULL) { + cb(exec_ctx, user_data, GRPC_SECURITY_ERROR, NULL, NULL); + } else { + sc->do_handshake(exec_ctx, sc, nonsecure_endpoint, cb, user_data); + } +} + +void grpc_server_security_connector_do_handshake( + grpc_exec_ctx *exec_ctx, grpc_server_security_connector *sc, + grpc_tcp_server_acceptor *acceptor, grpc_endpoint *nonsecure_endpoint, + grpc_security_handshake_done_cb cb, void *user_data) { + if (sc == NULL || nonsecure_endpoint == NULL) { + cb(exec_ctx, user_data, GRPC_SECURITY_ERROR, NULL, NULL); + } else { + sc->do_handshake(exec_ctx, sc, acceptor, nonsecure_endpoint, cb, user_data); + } +} + +void grpc_security_connector_check_peer(grpc_exec_ctx *exec_ctx, + grpc_security_connector *sc, + tsi_peer peer, + grpc_security_peer_check_cb cb, + void *user_data) { + if (sc == NULL) { + cb(exec_ctx, user_data, GRPC_SECURITY_ERROR, NULL); + tsi_peer_destruct(&peer); + } else { + sc->vtable->check_peer(exec_ctx, sc, peer, cb, user_data); + } +} + +void grpc_channel_security_connector_check_call_host( + grpc_exec_ctx *exec_ctx, grpc_channel_security_connector *sc, + const char *host, grpc_auth_context *auth_context, + grpc_security_call_host_check_cb cb, void *user_data) { + if (sc == NULL || sc->check_call_host == NULL) { + cb(exec_ctx, user_data, GRPC_SECURITY_ERROR); + } else { + sc->check_call_host(exec_ctx, sc, host, auth_context, cb, user_data); + } +} + +#ifdef GRPC_SECURITY_CONNECTOR_REFCOUNT_DEBUG +grpc_security_connector *grpc_security_connector_ref( + grpc_security_connector *sc, const char *file, int line, + const char *reason) { + if (sc == NULL) return NULL; + gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, + "SECURITY_CONNECTOR:%p ref %d -> %d %s", sc, + (int)sc->refcount.count, (int)sc->refcount.count + 1, reason); +#else +grpc_security_connector *grpc_security_connector_ref( + grpc_security_connector *sc) { + if (sc == NULL) return NULL; +#endif + gpr_ref(&sc->refcount); + return sc; +} + +#ifdef GRPC_SECURITY_CONNECTOR_REFCOUNT_DEBUG +void grpc_security_connector_unref(grpc_security_connector *sc, + const char *file, int line, + const char *reason) { + if (sc == NULL) return; + gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, + "SECURITY_CONNECTOR:%p unref %d -> %d %s", sc, + (int)sc->refcount.count, (int)sc->refcount.count - 1, reason); +#else +void grpc_security_connector_unref(grpc_security_connector *sc) { + if (sc == NULL) return; +#endif + if (gpr_unref(&sc->refcount)) sc->vtable->destroy(sc); +} + +static void connector_pointer_arg_destroy(void *p) { + GRPC_SECURITY_CONNECTOR_UNREF(p, "connector_pointer_arg"); +} + +static void *connector_pointer_arg_copy(void *p) { + return GRPC_SECURITY_CONNECTOR_REF(p, "connector_pointer_arg"); +} + +static int connector_pointer_cmp(void *a, void *b) { return GPR_ICMP(a, b); } + +static const grpc_arg_pointer_vtable connector_pointer_vtable = { + connector_pointer_arg_copy, connector_pointer_arg_destroy, + connector_pointer_cmp}; + +grpc_arg grpc_security_connector_to_arg(grpc_security_connector *sc) { + grpc_arg result; + result.type = GRPC_ARG_POINTER; + result.key = GRPC_SECURITY_CONNECTOR_ARG; + result.value.pointer.vtable = &connector_pointer_vtable; + result.value.pointer.p = sc; + return result; +} + +grpc_security_connector *grpc_security_connector_from_arg(const grpc_arg *arg) { + if (strcmp(arg->key, GRPC_SECURITY_CONNECTOR_ARG)) return NULL; + if (arg->type != GRPC_ARG_POINTER) { + gpr_log(GPR_ERROR, "Invalid type %d for arg %s", arg->type, + GRPC_SECURITY_CONNECTOR_ARG); + return NULL; + } + return arg->value.pointer.p; +} + +grpc_security_connector *grpc_find_security_connector_in_args( + const grpc_channel_args *args) { + size_t i; + if (args == NULL) return NULL; + for (i = 0; i < args->num_args; i++) { + grpc_security_connector *sc = + grpc_security_connector_from_arg(&args->args[i]); + if (sc != NULL) return sc; + } + return NULL; +} + +/* -- Fake implementation. -- */ + +static void fake_channel_destroy(grpc_security_connector *sc) { + grpc_channel_security_connector *c = (grpc_channel_security_connector *)sc; + grpc_call_credentials_unref(c->request_metadata_creds); + gpr_free(sc); +} + +static void fake_server_destroy(grpc_security_connector *sc) { + grpc_server_security_connector *c = (grpc_server_security_connector *)sc; + gpr_mu_destroy(&c->mu); + gpr_free(sc); +} + +static void fake_check_peer(grpc_exec_ctx *exec_ctx, + grpc_security_connector *sc, tsi_peer peer, + grpc_security_peer_check_cb cb, void *user_data) { + const char *prop_name; + grpc_security_status status = GRPC_SECURITY_OK; + grpc_auth_context *auth_context = NULL; + if (peer.property_count != 1) { + gpr_log(GPR_ERROR, "Fake peers should only have 1 property."); + status = GRPC_SECURITY_ERROR; + goto end; + } + prop_name = peer.properties[0].name; + if (prop_name == NULL || + strcmp(prop_name, TSI_CERTIFICATE_TYPE_PEER_PROPERTY)) { + gpr_log(GPR_ERROR, "Unexpected property in fake peer: %s.", + prop_name == NULL ? "<EMPTY>" : prop_name); + status = GRPC_SECURITY_ERROR; + goto end; + } + if (strncmp(peer.properties[0].value.data, TSI_FAKE_CERTIFICATE_TYPE, + peer.properties[0].value.length)) { + gpr_log(GPR_ERROR, "Invalid value for cert type property."); + status = GRPC_SECURITY_ERROR; + goto end; + } + auth_context = grpc_auth_context_create(NULL); + grpc_auth_context_add_cstring_property( + auth_context, GRPC_TRANSPORT_SECURITY_TYPE_PROPERTY_NAME, + GRPC_FAKE_TRANSPORT_SECURITY_TYPE); + +end: + cb(exec_ctx, user_data, status, auth_context); + grpc_auth_context_unref(auth_context); + tsi_peer_destruct(&peer); +} + +static void fake_channel_check_call_host(grpc_exec_ctx *exec_ctx, + grpc_channel_security_connector *sc, + const char *host, + grpc_auth_context *auth_context, + grpc_security_call_host_check_cb cb, + void *user_data) { + cb(exec_ctx, user_data, GRPC_SECURITY_OK); +} + +static void fake_channel_do_handshake(grpc_exec_ctx *exec_ctx, + grpc_channel_security_connector *sc, + grpc_endpoint *nonsecure_endpoint, + grpc_security_handshake_done_cb cb, + void *user_data) { + grpc_do_security_handshake(exec_ctx, tsi_create_fake_handshaker(1), &sc->base, + true, nonsecure_endpoint, cb, user_data); +} + +static void fake_server_do_handshake(grpc_exec_ctx *exec_ctx, + grpc_server_security_connector *sc, + grpc_tcp_server_acceptor *acceptor, + grpc_endpoint *nonsecure_endpoint, + grpc_security_handshake_done_cb cb, + void *user_data) { + grpc_do_security_handshake(exec_ctx, tsi_create_fake_handshaker(0), &sc->base, + false, nonsecure_endpoint, cb, user_data); +} + +static grpc_security_connector_vtable fake_channel_vtable = { + fake_channel_destroy, fake_check_peer}; + +static grpc_security_connector_vtable fake_server_vtable = {fake_server_destroy, + fake_check_peer}; + +grpc_channel_security_connector *grpc_fake_channel_security_connector_create( + grpc_call_credentials *request_metadata_creds) { + grpc_channel_security_connector *c = gpr_malloc(sizeof(*c)); + memset(c, 0, sizeof(*c)); + gpr_ref_init(&c->base.refcount, 1); + c->base.url_scheme = GRPC_FAKE_SECURITY_URL_SCHEME; + c->base.vtable = &fake_channel_vtable; + c->request_metadata_creds = grpc_call_credentials_ref(request_metadata_creds); + c->check_call_host = fake_channel_check_call_host; + c->do_handshake = fake_channel_do_handshake; + return c; +} + +grpc_server_security_connector *grpc_fake_server_security_connector_create( + void) { + grpc_server_security_connector *c = + gpr_malloc(sizeof(grpc_server_security_connector)); + memset(c, 0, sizeof(*c)); + gpr_ref_init(&c->base.refcount, 1); + c->base.vtable = &fake_server_vtable; + c->base.url_scheme = GRPC_FAKE_SECURITY_URL_SCHEME; + c->do_handshake = fake_server_do_handshake; + gpr_mu_init(&c->mu); + return c; +} + +/* --- Ssl implementation. --- */ + +typedef struct { + grpc_channel_security_connector base; + tsi_ssl_handshaker_factory *handshaker_factory; + char *target_name; + char *overridden_target_name; +} grpc_ssl_channel_security_connector; + +typedef struct { + grpc_server_security_connector base; + tsi_ssl_handshaker_factory *handshaker_factory; +} grpc_ssl_server_security_connector; + +static void ssl_channel_destroy(grpc_security_connector *sc) { + grpc_ssl_channel_security_connector *c = + (grpc_ssl_channel_security_connector *)sc; + grpc_call_credentials_unref(c->base.request_metadata_creds); + if (c->handshaker_factory != NULL) { + tsi_ssl_handshaker_factory_destroy(c->handshaker_factory); + } + if (c->target_name != NULL) gpr_free(c->target_name); + if (c->overridden_target_name != NULL) gpr_free(c->overridden_target_name); + gpr_free(sc); +} + +static void ssl_server_destroy(grpc_security_connector *sc) { + grpc_ssl_server_security_connector *c = + (grpc_ssl_server_security_connector *)sc; + + if (c->handshaker_factory != NULL) { + tsi_ssl_handshaker_factory_destroy(c->handshaker_factory); + } + gpr_mu_destroy(&c->base.mu); + gpr_free(sc); +} + +static grpc_security_status ssl_create_handshaker( + tsi_ssl_handshaker_factory *handshaker_factory, bool is_client, + const char *peer_name, tsi_handshaker **handshaker) { + tsi_result result = TSI_OK; + if (handshaker_factory == NULL) return GRPC_SECURITY_ERROR; + result = tsi_ssl_handshaker_factory_create_handshaker( + handshaker_factory, is_client ? peer_name : NULL, handshaker); + if (result != TSI_OK) { + gpr_log(GPR_ERROR, "Handshaker creation failed with error %s.", + tsi_result_to_string(result)); + return GRPC_SECURITY_ERROR; + } + return GRPC_SECURITY_OK; +} + +static void ssl_channel_do_handshake(grpc_exec_ctx *exec_ctx, + grpc_channel_security_connector *sc, + grpc_endpoint *nonsecure_endpoint, + grpc_security_handshake_done_cb cb, + void *user_data) { + grpc_ssl_channel_security_connector *c = + (grpc_ssl_channel_security_connector *)sc; + tsi_handshaker *handshaker; + grpc_security_status status = ssl_create_handshaker( + c->handshaker_factory, true, + c->overridden_target_name != NULL ? c->overridden_target_name + : c->target_name, + &handshaker); + if (status != GRPC_SECURITY_OK) { + cb(exec_ctx, user_data, status, NULL, NULL); + } else { + grpc_do_security_handshake(exec_ctx, handshaker, &sc->base, true, + nonsecure_endpoint, cb, user_data); + } +} + +static void ssl_server_do_handshake(grpc_exec_ctx *exec_ctx, + grpc_server_security_connector *sc, + grpc_tcp_server_acceptor *acceptor, + grpc_endpoint *nonsecure_endpoint, + grpc_security_handshake_done_cb cb, + void *user_data) { + grpc_ssl_server_security_connector *c = + (grpc_ssl_server_security_connector *)sc; + tsi_handshaker *handshaker; + grpc_security_status status = + ssl_create_handshaker(c->handshaker_factory, false, NULL, &handshaker); + if (status != GRPC_SECURITY_OK) { + cb(exec_ctx, user_data, status, NULL, NULL); + } else { + grpc_do_security_handshake(exec_ctx, handshaker, &sc->base, false, + nonsecure_endpoint, cb, user_data); + } +} + +static int ssl_host_matches_name(const tsi_peer *peer, const char *peer_name) { + char *allocated_name = NULL; + int r; + + if (strchr(peer_name, ':') != NULL) { + char *ignored_port; + gpr_split_host_port(peer_name, &allocated_name, &ignored_port); + gpr_free(ignored_port); + peer_name = allocated_name; + if (!peer_name) return 0; + } + r = tsi_ssl_peer_matches_name(peer, peer_name); + gpr_free(allocated_name); + return r; +} + +grpc_auth_context *tsi_ssl_peer_to_auth_context(const tsi_peer *peer) { + size_t i; + grpc_auth_context *ctx = NULL; + const char *peer_identity_property_name = NULL; + + /* The caller has checked the certificate type property. */ + GPR_ASSERT(peer->property_count >= 1); + ctx = grpc_auth_context_create(NULL); + grpc_auth_context_add_cstring_property( + ctx, GRPC_TRANSPORT_SECURITY_TYPE_PROPERTY_NAME, + GRPC_SSL_TRANSPORT_SECURITY_TYPE); + for (i = 0; i < peer->property_count; i++) { + const tsi_peer_property *prop = &peer->properties[i]; + if (prop->name == NULL) continue; + if (strcmp(prop->name, TSI_X509_SUBJECT_COMMON_NAME_PEER_PROPERTY) == 0) { + /* If there is no subject alt name, have the CN as the identity. */ + if (peer_identity_property_name == NULL) { + peer_identity_property_name = GRPC_X509_CN_PROPERTY_NAME; + } + grpc_auth_context_add_property(ctx, GRPC_X509_CN_PROPERTY_NAME, + prop->value.data, prop->value.length); + } else if (strcmp(prop->name, + TSI_X509_SUBJECT_ALTERNATIVE_NAME_PEER_PROPERTY) == 0) { + peer_identity_property_name = GRPC_X509_SAN_PROPERTY_NAME; + grpc_auth_context_add_property(ctx, GRPC_X509_SAN_PROPERTY_NAME, + prop->value.data, prop->value.length); + } else if (strcmp(prop->name, TSI_X509_PEM_CERT_PROPERTY) == 0) { + grpc_auth_context_add_property(ctx, GRPC_X509_PEM_CERT_PROPERTY_NAME, + prop->value.data, prop->value.length); + } + } + if (peer_identity_property_name != NULL) { + GPR_ASSERT(grpc_auth_context_set_peer_identity_property_name( + ctx, peer_identity_property_name) == 1); + } + return ctx; +} + +static grpc_security_status ssl_check_peer(grpc_security_connector *sc, + const char *peer_name, + const tsi_peer *peer, + grpc_auth_context **auth_context) { + /* Check the ALPN. */ + const tsi_peer_property *p = + tsi_peer_get_property_by_name(peer, TSI_SSL_ALPN_SELECTED_PROTOCOL); + if (p == NULL) { + gpr_log(GPR_ERROR, "Missing selected ALPN property."); + return GRPC_SECURITY_ERROR; + } + if (!grpc_chttp2_is_alpn_version_supported(p->value.data, p->value.length)) { + gpr_log(GPR_ERROR, "Invalid ALPN value."); + return GRPC_SECURITY_ERROR; + } + + /* Check the peer name if specified. */ + if (peer_name != NULL && !ssl_host_matches_name(peer, peer_name)) { + gpr_log(GPR_ERROR, "Peer name %s is not in peer certificate", peer_name); + return GRPC_SECURITY_ERROR; + } + *auth_context = tsi_ssl_peer_to_auth_context(peer); + return GRPC_SECURITY_OK; +} + +static void ssl_channel_check_peer(grpc_exec_ctx *exec_ctx, + grpc_security_connector *sc, tsi_peer peer, + grpc_security_peer_check_cb cb, + void *user_data) { + grpc_ssl_channel_security_connector *c = + (grpc_ssl_channel_security_connector *)sc; + grpc_security_status status; + grpc_auth_context *auth_context = NULL; + status = ssl_check_peer(sc, c->overridden_target_name != NULL + ? c->overridden_target_name + : c->target_name, + &peer, &auth_context); + cb(exec_ctx, user_data, status, auth_context); + grpc_auth_context_unref(auth_context); + tsi_peer_destruct(&peer); +} + +static void ssl_server_check_peer(grpc_exec_ctx *exec_ctx, + grpc_security_connector *sc, tsi_peer peer, + grpc_security_peer_check_cb cb, + void *user_data) { + grpc_auth_context *auth_context = NULL; + grpc_security_status status = ssl_check_peer(sc, NULL, &peer, &auth_context); + tsi_peer_destruct(&peer); + cb(exec_ctx, user_data, status, auth_context); + grpc_auth_context_unref(auth_context); +} + +static void add_shallow_auth_property_to_peer(tsi_peer *peer, + const grpc_auth_property *prop, + const char *tsi_prop_name) { + tsi_peer_property *tsi_prop = &peer->properties[peer->property_count++]; + tsi_prop->name = (char *)tsi_prop_name; + tsi_prop->value.data = prop->value; + tsi_prop->value.length = prop->value_length; +} + +tsi_peer tsi_shallow_peer_from_ssl_auth_context( + const grpc_auth_context *auth_context) { + size_t max_num_props = 0; + grpc_auth_property_iterator it; + const grpc_auth_property *prop; + tsi_peer peer; + memset(&peer, 0, sizeof(peer)); + + it = grpc_auth_context_property_iterator(auth_context); + while (grpc_auth_property_iterator_next(&it) != NULL) max_num_props++; + + if (max_num_props > 0) { + peer.properties = gpr_malloc(max_num_props * sizeof(tsi_peer_property)); + it = grpc_auth_context_property_iterator(auth_context); + while ((prop = grpc_auth_property_iterator_next(&it)) != NULL) { + if (strcmp(prop->name, GRPC_X509_SAN_PROPERTY_NAME) == 0) { + add_shallow_auth_property_to_peer( + &peer, prop, TSI_X509_SUBJECT_ALTERNATIVE_NAME_PEER_PROPERTY); + } else if (strcmp(prop->name, GRPC_X509_CN_PROPERTY_NAME) == 0) { + add_shallow_auth_property_to_peer( + &peer, prop, TSI_X509_SUBJECT_COMMON_NAME_PEER_PROPERTY); + } else if (strcmp(prop->name, GRPC_X509_PEM_CERT_PROPERTY_NAME) == 0) { + add_shallow_auth_property_to_peer(&peer, prop, + TSI_X509_PEM_CERT_PROPERTY); + } + } + } + return peer; +} + +void tsi_shallow_peer_destruct(tsi_peer *peer) { + if (peer->properties != NULL) gpr_free(peer->properties); +} + +static void ssl_channel_check_call_host(grpc_exec_ctx *exec_ctx, + grpc_channel_security_connector *sc, + const char *host, + grpc_auth_context *auth_context, + grpc_security_call_host_check_cb cb, + void *user_data) { + grpc_ssl_channel_security_connector *c = + (grpc_ssl_channel_security_connector *)sc; + grpc_security_status status = GRPC_SECURITY_ERROR; + tsi_peer peer = tsi_shallow_peer_from_ssl_auth_context(auth_context); + if (ssl_host_matches_name(&peer, host)) status = GRPC_SECURITY_OK; + + /* If the target name was overridden, then the original target_name was + 'checked' transitively during the previous peer check at the end of the + handshake. */ + if (c->overridden_target_name != NULL && strcmp(host, c->target_name) == 0) { + status = GRPC_SECURITY_OK; + } + cb(exec_ctx, user_data, status); + tsi_shallow_peer_destruct(&peer); +} + +static grpc_security_connector_vtable ssl_channel_vtable = { + ssl_channel_destroy, ssl_channel_check_peer}; + +static grpc_security_connector_vtable ssl_server_vtable = { + ssl_server_destroy, ssl_server_check_peer}; + +static gpr_slice compute_default_pem_root_certs_once(void) { + gpr_slice result = gpr_empty_slice(); + + /* First try to load the roots from the environment. */ + char *default_root_certs_path = + gpr_getenv(GRPC_DEFAULT_SSL_ROOTS_FILE_PATH_ENV_VAR); + if (default_root_certs_path != NULL) { + result = gpr_load_file(default_root_certs_path, 0, NULL); + gpr_free(default_root_certs_path); + } + + /* Try overridden roots if needed. */ + grpc_ssl_roots_override_result ovrd_res = GRPC_SSL_ROOTS_OVERRIDE_FAIL; + if (GPR_SLICE_IS_EMPTY(result) && ssl_roots_override_cb != NULL) { + char *pem_root_certs = NULL; + ovrd_res = ssl_roots_override_cb(&pem_root_certs); + if (ovrd_res == GRPC_SSL_ROOTS_OVERRIDE_OK) { + GPR_ASSERT(pem_root_certs != NULL); + result = gpr_slice_new(pem_root_certs, strlen(pem_root_certs), gpr_free); + } + } + + /* Fall back to installed certs if needed. */ + if (GPR_SLICE_IS_EMPTY(result) && + ovrd_res != GRPC_SSL_ROOTS_OVERRIDE_FAIL_PERMANENTLY) { + result = gpr_load_file(installed_roots_path, 0, NULL); + } + return result; +} + +static gpr_slice default_pem_root_certs; + +static void init_default_pem_root_certs(void) { + default_pem_root_certs = compute_default_pem_root_certs_once(); +} + +gpr_slice grpc_get_default_ssl_roots_for_testing(void) { + return compute_default_pem_root_certs_once(); +} + +size_t grpc_get_default_ssl_roots(const unsigned char **pem_root_certs) { + /* TODO(jboeuf@google.com): Maybe revisit the approach which consists in + loading all the roots once for the lifetime of the process. */ + static gpr_once once = GPR_ONCE_INIT; + gpr_once_init(&once, init_default_pem_root_certs); + *pem_root_certs = GPR_SLICE_START_PTR(default_pem_root_certs); + return GPR_SLICE_LENGTH(default_pem_root_certs); +} + +grpc_security_status grpc_ssl_channel_security_connector_create( + grpc_call_credentials *request_metadata_creds, + const grpc_ssl_config *config, const char *target_name, + const char *overridden_target_name, grpc_channel_security_connector **sc) { + size_t num_alpn_protocols = grpc_chttp2_num_alpn_versions(); + const unsigned char **alpn_protocol_strings = + gpr_malloc(sizeof(const char *) * num_alpn_protocols); + unsigned char *alpn_protocol_string_lengths = + gpr_malloc(sizeof(unsigned char) * num_alpn_protocols); + tsi_result result = TSI_OK; + grpc_ssl_channel_security_connector *c; + size_t i; + const unsigned char *pem_root_certs; + size_t pem_root_certs_size; + char *port; + + for (i = 0; i < num_alpn_protocols; i++) { + alpn_protocol_strings[i] = + (const unsigned char *)grpc_chttp2_get_alpn_version_index(i); + alpn_protocol_string_lengths[i] = + (unsigned char)strlen(grpc_chttp2_get_alpn_version_index(i)); + } + + if (config == NULL || target_name == NULL) { + gpr_log(GPR_ERROR, "An ssl channel needs a config and a target name."); + goto error; + } + if (config->pem_root_certs == NULL) { + pem_root_certs_size = grpc_get_default_ssl_roots(&pem_root_certs); + if (pem_root_certs == NULL || pem_root_certs_size == 0) { + gpr_log(GPR_ERROR, "Could not get default pem root certs."); + goto error; + } + } else { + pem_root_certs = config->pem_root_certs; + pem_root_certs_size = config->pem_root_certs_size; + } + + c = gpr_malloc(sizeof(grpc_ssl_channel_security_connector)); + memset(c, 0, sizeof(grpc_ssl_channel_security_connector)); + + gpr_ref_init(&c->base.base.refcount, 1); + c->base.base.vtable = &ssl_channel_vtable; + c->base.base.url_scheme = GRPC_SSL_URL_SCHEME; + c->base.request_metadata_creds = + grpc_call_credentials_ref(request_metadata_creds); + c->base.check_call_host = ssl_channel_check_call_host; + c->base.do_handshake = ssl_channel_do_handshake; + gpr_split_host_port(target_name, &c->target_name, &port); + gpr_free(port); + if (overridden_target_name != NULL) { + c->overridden_target_name = gpr_strdup(overridden_target_name); + } + result = tsi_create_ssl_client_handshaker_factory( + config->pem_private_key, config->pem_private_key_size, + config->pem_cert_chain, config->pem_cert_chain_size, pem_root_certs, + pem_root_certs_size, ssl_cipher_suites(), alpn_protocol_strings, + alpn_protocol_string_lengths, (uint16_t)num_alpn_protocols, + &c->handshaker_factory); + if (result != TSI_OK) { + gpr_log(GPR_ERROR, "Handshaker factory creation failed with %s.", + tsi_result_to_string(result)); + ssl_channel_destroy(&c->base.base); + *sc = NULL; + goto error; + } + *sc = &c->base; + gpr_free((void *)alpn_protocol_strings); + gpr_free(alpn_protocol_string_lengths); + return GRPC_SECURITY_OK; + +error: + gpr_free((void *)alpn_protocol_strings); + gpr_free(alpn_protocol_string_lengths); + return GRPC_SECURITY_ERROR; +} + +grpc_security_status grpc_ssl_server_security_connector_create( + const grpc_ssl_server_config *config, grpc_server_security_connector **sc) { + size_t num_alpn_protocols = grpc_chttp2_num_alpn_versions(); + const unsigned char **alpn_protocol_strings = + gpr_malloc(sizeof(const char *) * num_alpn_protocols); + unsigned char *alpn_protocol_string_lengths = + gpr_malloc(sizeof(unsigned char) * num_alpn_protocols); + tsi_result result = TSI_OK; + grpc_ssl_server_security_connector *c; + size_t i; + + for (i = 0; i < num_alpn_protocols; i++) { + alpn_protocol_strings[i] = + (const unsigned char *)grpc_chttp2_get_alpn_version_index(i); + alpn_protocol_string_lengths[i] = + (unsigned char)strlen(grpc_chttp2_get_alpn_version_index(i)); + } + + if (config == NULL || config->num_key_cert_pairs == 0) { + gpr_log(GPR_ERROR, "An SSL server needs a key and a cert."); + goto error; + } + c = gpr_malloc(sizeof(grpc_ssl_server_security_connector)); + memset(c, 0, sizeof(grpc_ssl_server_security_connector)); + + gpr_ref_init(&c->base.base.refcount, 1); + c->base.base.url_scheme = GRPC_SSL_URL_SCHEME; + c->base.base.vtable = &ssl_server_vtable; + result = tsi_create_ssl_server_handshaker_factory( + (const unsigned char **)config->pem_private_keys, + config->pem_private_keys_sizes, + (const unsigned char **)config->pem_cert_chains, + config->pem_cert_chains_sizes, config->num_key_cert_pairs, + config->pem_root_certs, config->pem_root_certs_size, + config->force_client_auth, ssl_cipher_suites(), alpn_protocol_strings, + alpn_protocol_string_lengths, (uint16_t)num_alpn_protocols, + &c->handshaker_factory); + if (result != TSI_OK) { + gpr_log(GPR_ERROR, "Handshaker factory creation failed with %s.", + tsi_result_to_string(result)); + ssl_server_destroy(&c->base.base); + *sc = NULL; + goto error; + } + gpr_mu_init(&c->base.mu); + c->base.do_handshake = ssl_server_do_handshake; + *sc = &c->base; + gpr_free((void *)alpn_protocol_strings); + gpr_free(alpn_protocol_string_lengths); + return GRPC_SECURITY_OK; + +error: + gpr_free((void *)alpn_protocol_strings); + gpr_free(alpn_protocol_string_lengths); + return GRPC_SECURITY_ERROR; +} |