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/*-
* Copyright 2016 Vsevolod Stakhov
*
* 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 "config.h"
#include "libutil/util.h"
#include "libutil/map.h"
#include "libutil/upstream.h"
#include "libserver/protocol.h"
#include "libserver/cfg_file.h"
#include "libserver/url.h"
#include "libserver/dns.h"
#include "libmime/message.h"
#include "rspamd.h"
#include "libserver/worker_util.h"
#include "keypairs_cache.h"
#include "ottery.h"
#include "unix-std.h"
/* Rotate keys each minute by default */
#define DEFAULT_ROTATION_TIME 60.0
gpointer init_http_proxy (struct rspamd_config *cfg);
void start_http_proxy (struct rspamd_worker *worker);
worker_t http_proxy_worker = {
"http_proxy", /* Name */
init_http_proxy, /* Init function */
start_http_proxy, /* Start function */
RSPAMD_WORKER_HAS_SOCKET | RSPAMD_WORKER_KILLABLE,
SOCK_STREAM, /* TCP socket */
RSPAMD_WORKER_VER
};
struct rspamd_http_upstream {
gchar *name;
struct upstream_list *u;
struct rspamd_cryptobox_pubkey *key;
};
struct http_proxy_ctx {
gdouble timeout;
struct timeval io_tv;
struct rspamd_config *cfg;
/* DNS resolver */
struct rspamd_dns_resolver *resolver;
/* Events base */
struct event_base *ev_base;
/* Encryption key for clients */
struct rspamd_cryptobox_keypair *key;
/* Keys cache */
struct rspamd_keypair_cache *keys_cache;
/* Upstreams to use */
GHashTable *upstreams;
/* Default upstream */
struct rspamd_http_upstream *default_upstream;
/* Local rotating keypair for upstreams */
struct rspamd_cryptobox_keypair *local_key;
struct event rotate_ev;
gdouble rotate_tm;
};
struct http_proxy_session {
struct http_proxy_ctx *ctx;
struct event_base *ev_base;
struct rspamd_cryptobox_keypair *local_key;
struct rspamd_cryptobox_pubkey *remote_key;
struct upstream *up;
gint client_sock;
gint backend_sock;
rspamd_inet_addr_t *client_addr;
struct rspamd_http_connection *client_conn;
struct rspamd_http_connection *backend_conn;
struct rspamd_dns_resolver *resolver;
gboolean replied;
};
static GQuark
http_proxy_quark (void)
{
return g_quark_from_static_string ("http-proxy");
}
static gboolean
http_proxy_parse_upstream (rspamd_mempool_t *pool,
const ucl_object_t *obj,
gpointer ud,
struct rspamd_rcl_section *section,
GError **err)
{
const ucl_object_t *elt;
struct rspamd_http_upstream *up = NULL;
struct http_proxy_ctx *ctx;
struct rspamd_rcl_struct_parser *pd = ud;
ctx = pd->user_struct;
if (ucl_object_type (obj) != UCL_OBJECT) {
g_set_error (err, http_proxy_quark (), 100,
"upstream option must be an object");
return FALSE;
}
elt = ucl_object_lookup (obj, "name");
if (elt == NULL) {
g_set_error (err, http_proxy_quark (), 100,
"upstream option must have some name definition");
return FALSE;
}
up = g_slice_alloc0 (sizeof (*up));
up->name = g_strdup (ucl_object_tostring (elt));
elt = ucl_object_lookup (obj, "key");
if (elt != NULL) {
up->key = rspamd_pubkey_from_base32 (ucl_object_tostring (elt), 0,
RSPAMD_KEYPAIR_KEX, RSPAMD_CRYPTOBOX_MODE_25519);
if (up->key == NULL) {
g_set_error (err, http_proxy_quark (), 100,
"cannot read upstream key");
goto err;
}
}
elt = ucl_object_lookup (obj, "hosts");
if (elt == NULL) {
g_set_error (err, http_proxy_quark (), 100,
"upstream option must have some hosts definition");
goto err;
}
up->u = rspamd_upstreams_create (ctx->cfg->ups_ctx);
if (!rspamd_upstreams_from_ucl (up->u, elt, 11333, NULL)) {
g_set_error (err, http_proxy_quark (), 100,
"upstream has bad hosts definition");
goto err;
}
elt = ucl_object_lookup (obj, "default");
if (elt && ucl_object_toboolean (elt)) {
ctx->default_upstream = up;
}
g_hash_table_insert (ctx->upstreams, up->name, up);
return TRUE;
err:
if (up) {
g_free (up->name);
rspamd_upstreams_destroy (up->u);
if (up->key) {
rspamd_pubkey_unref (up->key);
}
g_slice_free1 (sizeof (*up), up);
}
return FALSE;
}
gpointer
init_http_proxy (struct rspamd_config *cfg)
{
struct http_proxy_ctx *ctx;
GQuark type;
type = g_quark_try_string ("http_proxy");
ctx = g_malloc0 (sizeof (struct http_proxy_ctx));
ctx->timeout = 5.0;
ctx->upstreams = g_hash_table_new (rspamd_strcase_hash, rspamd_strcase_equal);
ctx->rotate_tm = DEFAULT_ROTATION_TIME;
ctx->cfg = cfg;
rspamd_rcl_register_worker_option (cfg,
type,
"timeout",
rspamd_rcl_parse_struct_time,
ctx,
G_STRUCT_OFFSET (struct http_proxy_ctx,
timeout),
RSPAMD_CL_FLAG_TIME_FLOAT,
"IO timeout");
rspamd_rcl_register_worker_option (cfg,
type,
"rotate",
rspamd_rcl_parse_struct_time,
ctx,
G_STRUCT_OFFSET (struct http_proxy_ctx,
rotate_tm),
RSPAMD_CL_FLAG_TIME_FLOAT,
"Rotation keys time, default: "
G_STRINGIFY (DEFAULT_ROTATION_TIME) " seconds");
rspamd_rcl_register_worker_option (cfg,
type,
"keypair",
rspamd_rcl_parse_struct_keypair,
ctx,
G_STRUCT_OFFSET (struct http_proxy_ctx,
key),
0,
"Server's keypair");
rspamd_rcl_register_worker_option (cfg,
type,
"upstream",
http_proxy_parse_upstream,
ctx,
0,
0,
"List of upstreams");
return ctx;
}
static void
proxy_session_cleanup (struct http_proxy_session *session)
{
rspamd_inet_address_destroy (session->client_addr);
if (session->backend_conn) {
rspamd_http_connection_unref (session->backend_conn);
}
if (session->client_conn) {
rspamd_http_connection_unref (session->client_conn);
}
close (session->backend_sock);
close (session->client_sock);
g_slice_free1 (sizeof (*session), session);
}
static void
proxy_client_write_error (struct http_proxy_session *session, gint code)
{
struct rspamd_http_message *reply;
reply = rspamd_http_new_message (HTTP_RESPONSE);
reply->code = code;
rspamd_http_connection_write_message (session->client_conn,
reply, NULL, NULL, session, session->client_sock,
&session->ctx->io_tv, session->ev_base);
}
static void
proxy_backend_error_handler (struct rspamd_http_connection *conn, GError *err)
{
struct http_proxy_session *session = conn->ud;
msg_info ("abnormally closing connection from backend: %s, error: %s",
rspamd_inet_address_to_string (rspamd_upstream_addr (session->up)),
err->message);
rspamd_http_connection_reset (session->backend_conn);
/* Terminate session immediately */
proxy_client_write_error (session, err->code);
}
static gint
proxy_backend_finish_handler (struct rspamd_http_connection *conn,
struct rspamd_http_message *msg)
{
struct http_proxy_session *session = conn->ud;
rspamd_http_connection_steal_msg (session->backend_conn);
rspamd_http_message_remove_header (msg, "Content-Length");
rspamd_http_message_remove_header (msg, "Key");
rspamd_http_connection_reset (session->backend_conn);
rspamd_http_connection_write_message (session->client_conn,
msg, NULL, NULL, session, session->client_sock,
&session->ctx->io_tv, session->ev_base);
return 0;
}
static void
proxy_client_error_handler (struct rspamd_http_connection *conn, GError *err)
{
struct http_proxy_session *session = conn->ud;
msg_info ("abnormally closing connection from: %s, error: %s",
rspamd_inet_address_to_string (session->client_addr), err->message);
/* Terminate session immediately */
proxy_session_cleanup (session);
}
static gint
proxy_client_finish_handler (struct rspamd_http_connection *conn,
struct rspamd_http_message *msg)
{
struct http_proxy_session *session = conn->ud;
struct rspamd_http_upstream *backend = NULL;
const rspamd_ftok_t *host;
gchar hostbuf[512];
if (!session->replied) {
host = rspamd_http_message_find_header (msg, "Host");
if (host == NULL) {
backend = session->ctx->default_upstream;
}
else {
rspamd_strlcpy (hostbuf, host->begin, MIN(host->len + 1, sizeof (hostbuf)));
backend = g_hash_table_lookup (session->ctx->upstreams, hostbuf);
if (backend == NULL) {
backend = session->ctx->default_upstream;
}
}
if (backend == NULL) {
/* No backend */
msg_err ("cannot find upstream for %s", host ? hostbuf : "default");
goto err;
}
else {
session->up = rspamd_upstream_get (backend->u,
RSPAMD_UPSTREAM_ROUND_ROBIN, NULL, 0);
if (session->up == NULL) {
msg_err ("cannot select upstream for %s", host ? hostbuf : "default");
goto err;
}
session->backend_sock = rspamd_inet_address_connect (
rspamd_upstream_addr (session->up), SOCK_STREAM, TRUE);
if (session->backend_sock == -1) {
msg_err ("cannot connect upstream for %s", host ? hostbuf : "default");
rspamd_upstream_fail (session->up);
goto err;
}
rspamd_http_connection_steal_msg (session->client_conn);
rspamd_http_message_remove_header (msg, "Content-Length");
rspamd_http_message_remove_header (msg, "Key");
rspamd_http_connection_reset (session->client_conn);
session->backend_conn = rspamd_http_connection_new (
NULL,
proxy_backend_error_handler,
proxy_backend_finish_handler,
RSPAMD_HTTP_CLIENT_SIMPLE,
RSPAMD_HTTP_CLIENT,
session->ctx->keys_cache);
rspamd_http_connection_set_key (session->backend_conn,
session->ctx->local_key);
msg->peer_key = rspamd_pubkey_ref (backend->key);
session->replied = TRUE;
rspamd_http_connection_write_message (session->backend_conn,
msg, NULL, NULL, session, session->backend_sock,
&session->ctx->io_tv, session->ev_base);
}
}
else {
proxy_session_cleanup (session);
}
return 0;
err:
session->replied = TRUE;
proxy_client_write_error (session, 404);
return 0;
}
static void
proxy_accept_socket (gint fd, short what, void *arg)
{
struct rspamd_worker *worker = (struct rspamd_worker *) arg;
struct http_proxy_ctx *ctx;
rspamd_inet_addr_t *addr;
struct http_proxy_session *session;
gint nfd;
ctx = worker->ctx;
if ((nfd =
rspamd_accept_from_socket (fd, &addr)) == -1) {
msg_warn ("accept failed: %s", strerror (errno));
return;
}
/* Check for EAGAIN */
if (nfd == 0) {
return;
}
msg_info ("accepted connection from %s port %d",
rspamd_inet_address_to_string (addr),
rspamd_inet_address_get_port (addr));
session = g_slice_alloc0 (sizeof (*session));
session->client_sock = nfd;
session->client_addr = addr;
session->resolver = ctx->resolver;
session->client_conn = rspamd_http_connection_new (
NULL,
proxy_client_error_handler,
proxy_client_finish_handler,
0,
RSPAMD_HTTP_SERVER,
ctx->keys_cache);
session->ev_base = ctx->ev_base;
session->ctx = ctx;
if (ctx->key) {
rspamd_http_connection_set_key (session->client_conn, ctx->key);
}
rspamd_http_connection_read_message (session->client_conn,
session,
nfd,
&ctx->io_tv,
ctx->ev_base);
}
static void
proxy_rotate_key (gint fd, short what, void *arg)
{
struct timeval rot_tv;
struct http_proxy_ctx *ctx = arg;
gpointer kp;
double_to_tv (ctx->rotate_tm, &rot_tv);
rot_tv.tv_sec += ottery_rand_range (rot_tv.tv_sec);
event_del (&ctx->rotate_ev);
event_add (&ctx->rotate_ev, &rot_tv);
kp = ctx->local_key;
ctx->local_key = rspamd_keypair_new (RSPAMD_KEYPAIR_KEX,
RSPAMD_CRYPTOBOX_MODE_25519);
rspamd_keypair_unref (kp);
}
void
start_http_proxy (struct rspamd_worker *worker)
{
struct http_proxy_ctx *ctx = worker->ctx;
struct timeval rot_tv;
ctx->ev_base = rspamd_prepare_worker (worker, "http_proxy",
proxy_accept_socket);
ctx->resolver = dns_resolver_init (worker->srv->logger,
ctx->ev_base,
worker->srv->cfg);
double_to_tv (ctx->timeout, &ctx->io_tv);
rspamd_map_watch (worker->srv->cfg, ctx->ev_base, ctx->resolver);
rspamd_upstreams_library_config (worker->srv->cfg, ctx->cfg->ups_ctx,
ctx->ev_base, ctx->resolver->r);
/* XXX: stupid default */
ctx->keys_cache = rspamd_keypair_cache_new (256);
ctx->local_key = rspamd_keypair_new (RSPAMD_KEYPAIR_KEX,
RSPAMD_CRYPTOBOX_MODE_25519);
double_to_tv (ctx->rotate_tm, &rot_tv);
rot_tv.tv_sec += ottery_rand_range (rot_tv.tv_sec);
event_set (&ctx->rotate_ev, -1, EV_TIMEOUT, proxy_rotate_key, ctx);
event_base_set (ctx->ev_base, &ctx->rotate_ev);
event_add (&ctx->rotate_ev, &rot_tv);
event_base_loop (ctx->ev_base, 0);
rspamd_worker_block_signals ();
g_mime_shutdown ();
rspamd_log_close (worker->srv->logger);
if (ctx->key) {
rspamd_keypair_unref (ctx->key);
}
rspamd_keypair_cache_destroy (ctx->keys_cache);
exit (EXIT_SUCCESS);
}
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