blob: bdccbabfea3458a4cd2e912aecebe1cd8d610af3 [file] [log] [blame]
/*
*
* 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/security/security_connector.h"
#include <string.h>
#include "src/core/security/credentials.h"
#include "src/core/security/handshake.h"
#include "src/core/security/secure_endpoint.h"
#include "src/core/security/security_context.h"
#include "src/core/support/env.h"
#include "src/core/support/file.h"
#include "src/core/support/string.h"
#include "src/core/transport/chttp2/alpn.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/tsi/fake_transport_security.h"
#include "src/core/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_security_connector_shutdown(grpc_exec_ctx *exec_ctx,
grpc_security_connector *connector) {
grpc_security_connector_handshake_list *tmp;
if (!connector->is_client_side) {
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_security_connector_do_handshake(grpc_exec_ctx *exec_ctx,
grpc_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->vtable->do_handshake(exec_ctx, sc, 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");
}
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.destroy = connector_pointer_arg_destroy;
result.value.pointer.copy = connector_pointer_arg_copy;
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) {
gpr_mu_destroy(&sc->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_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,
nonsecure_endpoint, cb, user_data);
}
static void fake_server_do_handshake(grpc_exec_ctx *exec_ctx,
grpc_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(0), sc,
nonsecure_endpoint, cb, user_data);
}
static grpc_security_connector_vtable fake_channel_vtable = {
fake_channel_destroy, fake_channel_do_handshake, fake_check_peer};
static grpc_security_connector_vtable fake_server_vtable = {
fake_server_destroy, fake_server_do_handshake, 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.is_client_side = 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;
return c;
}
grpc_security_connector *grpc_fake_server_security_connector_create(void) {
grpc_security_connector *c = gpr_malloc(sizeof(grpc_security_connector));
memset(c, 0, sizeof(grpc_security_connector));
gpr_ref_init(&c->refcount, 1);
c->is_client_side = 0;
c->vtable = &fake_server_vtable;
c->url_scheme = GRPC_FAKE_SECURITY_URL_SCHEME;
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_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(&sc->mu);
gpr_free(sc);
}
static grpc_security_status ssl_create_handshaker(
tsi_ssl_handshaker_factory *handshaker_factory, int 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_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, 1,
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, nonsecure_endpoint, cb,
user_data);
}
}
static void ssl_server_do_handshake(grpc_exec_ctx *exec_ctx,
grpc_security_connector *sc,
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, 0, NULL, &handshaker);
if (status != GRPC_SECURITY_OK) {
cb(exec_ctx, user_data, status, NULL, NULL);
} else {
grpc_do_security_handshake(exec_ctx, handshaker, sc, 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);
}
}
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_shalow_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_shalow_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_shalow_auth_property_to_peer(
&peer, prop, TSI_X509_SUBJECT_COMMON_NAME_PEER_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_do_handshake, ssl_channel_check_peer};
static grpc_security_connector_vtable ssl_server_vtable = {
ssl_server_destroy, ssl_server_do_handshake, 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.is_client_side = 1;
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;
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_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.refcount, 1);
c->base.url_scheme = GRPC_SSL_URL_SCHEME;
c->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);
*sc = NULL;
goto error;
}
gpr_mu_init(&c->base.mu);
*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;
}