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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "src/core/lib/http/httpcli.h"
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/channel/handshaker_registry.h"
#include "src/core/lib/security/transport/security_handshaker.h"
#include "src/core/lib/slice/slice_internal.h"
#include "src/core/lib/support/string.h"
#include "src/core/tsi/ssl_transport_security.h"
#include "src/core/tsi/transport_security_adapter.h"
typedef struct {
grpc_channel_security_connector base;
tsi_ssl_client_handshaker_factory* handshaker_factory;
char* secure_peer_name;
} grpc_httpcli_ssl_channel_security_connector;
static void httpcli_ssl_destroy(grpc_exec_ctx* exec_ctx,
grpc_security_connector* sc) {
grpc_httpcli_ssl_channel_security_connector* c =
(grpc_httpcli_ssl_channel_security_connector*)sc;
if (c->handshaker_factory != nullptr) {
tsi_ssl_client_handshaker_factory_unref(c->handshaker_factory);
c->handshaker_factory = nullptr;
}
if (c->secure_peer_name != nullptr) gpr_free(c->secure_peer_name);
gpr_free(sc);
}
static void httpcli_ssl_add_handshakers(grpc_exec_ctx* exec_ctx,
grpc_channel_security_connector* sc,
grpc_handshake_manager* handshake_mgr) {
grpc_httpcli_ssl_channel_security_connector* c =
(grpc_httpcli_ssl_channel_security_connector*)sc;
tsi_handshaker* handshaker = nullptr;
if (c->handshaker_factory != nullptr) {
tsi_result result = tsi_ssl_client_handshaker_factory_create_handshaker(
c->handshaker_factory, c->secure_peer_name, &handshaker);
if (result != TSI_OK) {
gpr_log(GPR_ERROR, "Handshaker creation failed with error %s.",
tsi_result_to_string(result));
}
}
grpc_handshake_manager_add(
handshake_mgr,
grpc_security_handshaker_create(
exec_ctx, tsi_create_adapter_handshaker(handshaker), &sc->base));
}
static void httpcli_ssl_check_peer(grpc_exec_ctx* exec_ctx,
grpc_security_connector* sc, tsi_peer peer,
grpc_auth_context** auth_context,
grpc_closure* on_peer_checked) {
grpc_httpcli_ssl_channel_security_connector* c =
(grpc_httpcli_ssl_channel_security_connector*)sc;
grpc_error* error = GRPC_ERROR_NONE;
/* Check the peer name. */
if (c->secure_peer_name != nullptr &&
!tsi_ssl_peer_matches_name(&peer, c->secure_peer_name)) {
char* msg;
gpr_asprintf(&msg, "Peer name %s is not in peer certificate",
c->secure_peer_name);
error = GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg);
gpr_free(msg);
}
GRPC_CLOSURE_SCHED(exec_ctx, on_peer_checked, error);
tsi_peer_destruct(&peer);
}
static int httpcli_ssl_cmp(grpc_security_connector* sc1,
grpc_security_connector* sc2) {
grpc_httpcli_ssl_channel_security_connector* c1 =
(grpc_httpcli_ssl_channel_security_connector*)sc1;
grpc_httpcli_ssl_channel_security_connector* c2 =
(grpc_httpcli_ssl_channel_security_connector*)sc2;
return strcmp(c1->secure_peer_name, c2->secure_peer_name);
}
static grpc_security_connector_vtable httpcli_ssl_vtable = {
httpcli_ssl_destroy, httpcli_ssl_check_peer, httpcli_ssl_cmp};
static grpc_security_status httpcli_ssl_channel_security_connector_create(
grpc_exec_ctx* exec_ctx, const char* pem_root_certs,
const char* secure_peer_name, grpc_channel_security_connector** sc) {
tsi_result result = TSI_OK;
grpc_httpcli_ssl_channel_security_connector* c;
if (secure_peer_name != nullptr && pem_root_certs == nullptr) {
gpr_log(GPR_ERROR,
"Cannot assert a secure peer name without a trust root.");
return GRPC_SECURITY_ERROR;
}
c = (grpc_httpcli_ssl_channel_security_connector*)gpr_zalloc(
sizeof(grpc_httpcli_ssl_channel_security_connector));
gpr_ref_init(&c->base.base.refcount, 1);
c->base.base.vtable = &httpcli_ssl_vtable;
if (secure_peer_name != nullptr) {
c->secure_peer_name = gpr_strdup(secure_peer_name);
}
result = tsi_create_ssl_client_handshaker_factory(
nullptr, pem_root_certs, nullptr, nullptr, 0, &c->handshaker_factory);
if (result != TSI_OK) {
gpr_log(GPR_ERROR, "Handshaker factory creation failed with %s.",
tsi_result_to_string(result));
httpcli_ssl_destroy(exec_ctx, &c->base.base);
*sc = nullptr;
return GRPC_SECURITY_ERROR;
}
// We don't actually need a channel credentials object in this case,
// but we set it to a non-NULL address so that we don't trigger
// assertions in grpc_channel_security_connector_cmp().
c->base.channel_creds = (grpc_channel_credentials*)1;
c->base.add_handshakers = httpcli_ssl_add_handshakers;
*sc = &c->base;
return GRPC_SECURITY_OK;
}
/* handshaker */
typedef struct {
void (*func)(grpc_exec_ctx* exec_ctx, void* arg, grpc_endpoint* endpoint);
void* arg;
grpc_handshake_manager* handshake_mgr;
} on_done_closure;
static void on_handshake_done(grpc_exec_ctx* exec_ctx, void* arg,
grpc_error* error) {
grpc_handshaker_args* args = (grpc_handshaker_args*)arg;
on_done_closure* c = (on_done_closure*)args->user_data;
if (error != GRPC_ERROR_NONE) {
const char* msg = grpc_error_string(error);
gpr_log(GPR_ERROR, "Secure transport setup failed: %s", msg);
c->func(exec_ctx, c->arg, nullptr);
} else {
grpc_channel_args_destroy(exec_ctx, args->args);
grpc_slice_buffer_destroy_internal(exec_ctx, args->read_buffer);
gpr_free(args->read_buffer);
c->func(exec_ctx, c->arg, args->endpoint);
}
grpc_handshake_manager_destroy(exec_ctx, c->handshake_mgr);
gpr_free(c);
}
static void ssl_handshake(grpc_exec_ctx* exec_ctx, void* arg,
grpc_endpoint* tcp, const char* host,
grpc_millis deadline,
void (*on_done)(grpc_exec_ctx* exec_ctx, void* arg,
grpc_endpoint* endpoint)) {
on_done_closure* c = (on_done_closure*)gpr_malloc(sizeof(*c));
const char* pem_root_certs = grpc_get_default_ssl_roots();
if (pem_root_certs == nullptr) {
gpr_log(GPR_ERROR, "Could not get default pem root certs.");
on_done(exec_ctx, arg, nullptr);
gpr_free(c);
return;
}
c->func = on_done;
c->arg = arg;
grpc_channel_security_connector* sc = nullptr;
GPR_ASSERT(httpcli_ssl_channel_security_connector_create(
exec_ctx, pem_root_certs, host, &sc) == GRPC_SECURITY_OK);
grpc_arg channel_arg = grpc_security_connector_to_arg(&sc->base);
grpc_channel_args args = {1, &channel_arg};
c->handshake_mgr = grpc_handshake_manager_create();
grpc_handshakers_add(exec_ctx, HANDSHAKER_CLIENT, &args, c->handshake_mgr);
grpc_handshake_manager_do_handshake(
exec_ctx, c->handshake_mgr, nullptr /* interested_parties */, tcp,
nullptr /* channel_args */, deadline, nullptr /* acceptor */,
on_handshake_done, c /* user_data */);
GRPC_SECURITY_CONNECTOR_UNREF(exec_ctx, &sc->base, "httpcli");
}
const grpc_httpcli_handshaker grpc_httpcli_ssl = {"https", ssl_handshake};
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