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/*
*
* 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 <grpc/grpc.h>
#include <string.h>
#include "src/core/channel/channel_args.h"
#include "src/core/channel/http_server_filter.h"
#include "src/core/iomgr/endpoint.h"
#include "src/core/iomgr/resolve_address.h"
#include "src/core/iomgr/tcp_server.h"
#include "src/core/security/auth_filters.h"
#include "src/core/security/credentials.h"
#include "src/core/security/security_connector.h"
#include "src/core/security/security_context.h"
#include "src/core/surface/api_trace.h"
#include "src/core/surface/server.h"
#include "src/core/transport/chttp2_transport.h"
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
#include <grpc/support/useful.h>
typedef struct tcp_endpoint_list {
grpc_endpoint *tcp_endpoint;
struct tcp_endpoint_list *next;
} tcp_endpoint_list;
typedef struct grpc_server_secure_state {
grpc_server *server;
grpc_tcp_server *tcp;
grpc_security_connector *sc;
grpc_server_credentials *creds;
tcp_endpoint_list *handshaking_tcp_endpoints;
int is_shutdown;
gpr_mu mu;
gpr_refcount refcount;
grpc_closure destroy_closure;
grpc_closure *destroy_callback;
} grpc_server_secure_state;
static void state_ref(grpc_server_secure_state *state) {
gpr_ref(&state->refcount);
}
static void state_unref(grpc_server_secure_state *state) {
if (gpr_unref(&state->refcount)) {
/* ensure all threads have unlocked */
gpr_mu_lock(&state->mu);
gpr_mu_unlock(&state->mu);
/* clean up */
GRPC_SECURITY_CONNECTOR_UNREF(state->sc, "server");
grpc_server_credentials_unref(state->creds);
gpr_free(state);
}
}
static void setup_transport(grpc_exec_ctx *exec_ctx, void *statep,
grpc_transport *transport, grpc_mdctx *mdctx) {
static grpc_channel_filter const *extra_filters[] = {
&grpc_server_auth_filter, &grpc_http_server_filter};
grpc_server_secure_state *state = statep;
grpc_channel_args *args_copy;
grpc_arg args_to_add[2];
args_to_add[0] = grpc_server_credentials_to_arg(state->creds);
args_to_add[1] =
grpc_auth_context_to_arg(state->sc->auth_context);
args_copy = grpc_channel_args_copy_and_add(
grpc_server_get_channel_args(state->server), args_to_add,
GPR_ARRAY_SIZE(args_to_add));
grpc_server_setup_transport(exec_ctx, state->server, transport, extra_filters,
GPR_ARRAY_SIZE(extra_filters), mdctx, args_copy);
grpc_channel_args_destroy(args_copy);
}
static int remove_tcp_from_list_locked(grpc_server_secure_state *state,
grpc_endpoint *tcp) {
tcp_endpoint_list *node = state->handshaking_tcp_endpoints;
tcp_endpoint_list *tmp = NULL;
if (node && node->tcp_endpoint == tcp) {
state->handshaking_tcp_endpoints = state->handshaking_tcp_endpoints->next;
gpr_free(node);
return 0;
}
while (node) {
if (node->next->tcp_endpoint == tcp) {
tmp = node->next;
node->next = node->next->next;
gpr_free(tmp);
return 0;
}
node = node->next;
}
return -1;
}
static void on_secure_handshake_done(grpc_exec_ctx *exec_ctx, void *statep,
grpc_security_status status,
grpc_endpoint *wrapped_endpoint,
grpc_endpoint *secure_endpoint) {
grpc_server_secure_state *state = statep;
grpc_transport *transport;
grpc_mdctx *mdctx;
if (status == GRPC_SECURITY_OK) {
gpr_mu_lock(&state->mu);
remove_tcp_from_list_locked(state, wrapped_endpoint);
if (!state->is_shutdown) {
mdctx = grpc_mdctx_create();
transport = grpc_create_chttp2_transport(
exec_ctx, grpc_server_get_channel_args(state->server),
secure_endpoint, mdctx, 0);
setup_transport(exec_ctx, state, transport, mdctx);
grpc_chttp2_transport_start_reading(exec_ctx, transport, NULL, 0);
} else {
/* We need to consume this here, because the server may already have gone
* away. */
grpc_endpoint_destroy(exec_ctx, secure_endpoint);
}
gpr_mu_unlock(&state->mu);
} else {
gpr_mu_lock(&state->mu);
remove_tcp_from_list_locked(state, wrapped_endpoint);
gpr_mu_unlock(&state->mu);
gpr_log(GPR_ERROR, "Secure transport failed with error %d", status);
}
state_unref(state);
}
static void on_accept(grpc_exec_ctx *exec_ctx, void *statep,
grpc_endpoint *tcp) {
grpc_server_secure_state *state = statep;
tcp_endpoint_list *node;
state_ref(state);
node = gpr_malloc(sizeof(tcp_endpoint_list));
node->tcp_endpoint = tcp;
gpr_mu_lock(&state->mu);
node->next = state->handshaking_tcp_endpoints;
state->handshaking_tcp_endpoints = node;
gpr_mu_unlock(&state->mu);
grpc_security_connector_do_handshake(exec_ctx, state->sc, tcp,
on_secure_handshake_done, state);
}
/* Server callback: start listening on our ports */
static void start(grpc_exec_ctx *exec_ctx, grpc_server *server, void *statep,
grpc_pollset **pollsets, size_t pollset_count) {
grpc_server_secure_state *state = statep;
grpc_tcp_server_start(exec_ctx, state->tcp, pollsets, pollset_count,
on_accept, state);
}
static void destroy_done(grpc_exec_ctx *exec_ctx, void *statep, int success) {
grpc_server_secure_state *state = statep;
state->destroy_callback->cb(exec_ctx, state->destroy_callback->cb_arg,
success);
gpr_mu_lock(&state->mu);
while (state->handshaking_tcp_endpoints != NULL) {
grpc_endpoint_shutdown(exec_ctx,
state->handshaking_tcp_endpoints->tcp_endpoint);
remove_tcp_from_list_locked(state,
state->handshaking_tcp_endpoints->tcp_endpoint);
}
gpr_mu_unlock(&state->mu);
state_unref(state);
}
/* Server callback: destroy the tcp listener (so we don't generate further
callbacks) */
static void destroy(grpc_exec_ctx *exec_ctx, grpc_server *server, void *statep,
grpc_closure *callback) {
grpc_server_secure_state *state = statep;
grpc_tcp_server *tcp;
gpr_mu_lock(&state->mu);
state->is_shutdown = 1;
state->destroy_callback = callback;
tcp = state->tcp;
gpr_mu_unlock(&state->mu);
grpc_closure_init(&state->destroy_closure, destroy_done, state);
grpc_tcp_server_destroy(exec_ctx, tcp, &state->destroy_closure);
}
int grpc_server_add_secure_http2_port(grpc_server *server, const char *addr,
grpc_server_credentials *creds) {
grpc_resolved_addresses *resolved = NULL;
grpc_tcp_server *tcp = NULL;
grpc_server_secure_state *state = NULL;
size_t i;
unsigned count = 0;
int port_num = -1;
int port_temp;
grpc_security_status status = GRPC_SECURITY_ERROR;
grpc_security_connector *sc = NULL;
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
GRPC_API_TRACE(
"grpc_server_add_secure_http2_port("
"server=%p, addr=%s, creds=%p)",
3, (server, addr, creds));
/* create security context */
if (creds == NULL) goto error;
status = grpc_server_credentials_create_security_connector(creds, &sc);
if (status != GRPC_SECURITY_OK) {
gpr_log(GPR_ERROR,
"Unable to create secure server with credentials of type %s.",
creds->type);
goto error;
}
/* resolve address */
resolved = grpc_blocking_resolve_address(addr, "https");
if (!resolved) {
goto error;
}
tcp = grpc_tcp_server_create();
if (!tcp) {
goto error;
}
for (i = 0; i < resolved->naddrs; i++) {
port_temp = grpc_tcp_server_add_port(
tcp, (struct sockaddr *)&resolved->addrs[i].addr,
resolved->addrs[i].len);
if (port_temp >= 0) {
if (port_num == -1) {
port_num = port_temp;
} else {
GPR_ASSERT(port_num == port_temp);
}
count++;
}
}
if (count == 0) {
gpr_log(GPR_ERROR, "No address added out of total %d resolved",
resolved->naddrs);
goto error;
}
if (count != resolved->naddrs) {
gpr_log(GPR_ERROR, "Only %d addresses added out of total %d resolved",
count, resolved->naddrs);
/* if it's an error, don't we want to goto error; here ? */
}
grpc_resolved_addresses_destroy(resolved);
state = gpr_malloc(sizeof(*state));
memset(state, 0, sizeof(*state));
state->server = server;
state->tcp = tcp;
state->sc = sc;
state->creds = grpc_server_credentials_ref(creds);
state->handshaking_tcp_endpoints = NULL;
state->is_shutdown = 0;
gpr_mu_init(&state->mu);
gpr_ref_init(&state->refcount, 1);
/* Register with the server only upon success */
grpc_server_add_listener(&exec_ctx, server, state, start, destroy);
grpc_exec_ctx_finish(&exec_ctx);
return port_num;
/* Error path: cleanup and return */
error:
if (sc) {
GRPC_SECURITY_CONNECTOR_UNREF(sc, "server");
}
if (resolved) {
grpc_resolved_addresses_destroy(resolved);
}
if (tcp) {
grpc_tcp_server_destroy(&exec_ctx, tcp, NULL);
}
if (state) {
gpr_free(state);
}
grpc_exec_ctx_finish(&exec_ctx);
return 0;
}
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