- /*
- * Copyright 2024 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 "milter.h"
- #include "milter_internal.h"
- #include "email_addr.h"
- #include "addr.h"
- #include "unix-std.h"
- #include "logger.h"
- #include "ottery.h"
- #include "libserver/http/http_connection.h"
- #include "libserver/http/http_private.h"
- #include "libserver/protocol_internal.h"
- #include "libserver/cfg_file_private.h"
- #include "libmime/scan_result.h"
- #include "libserver/worker_util.h"
- #include "utlist.h"
-
- #define msg_err_milter(...) rspamd_default_log_function(G_LOG_LEVEL_CRITICAL, \
- "milter", priv->pool->tag.uid, \
- RSPAMD_LOG_FUNC, \
- __VA_ARGS__)
- #define msg_warn_milter(...) rspamd_default_log_function(G_LOG_LEVEL_WARNING, \
- "milter", priv->pool->tag.uid, \
- RSPAMD_LOG_FUNC, \
- __VA_ARGS__)
- #define msg_info_milter(...) rspamd_default_log_function(G_LOG_LEVEL_INFO, \
- "milter", priv->pool->tag.uid, \
- RSPAMD_LOG_FUNC, \
- __VA_ARGS__)
- #define msg_debug_milter(...) rspamd_conditional_debug_fast(NULL, NULL, \
- rspamd_milter_log_id, "milter", priv->pool->tag.uid, \
- RSPAMD_LOG_FUNC, \
- __VA_ARGS__)
-
- INIT_LOG_MODULE(milter)
-
- static const struct rspamd_milter_context *milter_ctx = NULL;
-
- static gboolean rspamd_milter_handle_session(
- struct rspamd_milter_session *session,
- struct rspamd_milter_private *priv);
- static inline void rspamd_milter_plan_io(struct rspamd_milter_session *session,
- struct rspamd_milter_private *priv, gshort what);
-
- static GQuark
- rspamd_milter_quark(void)
- {
- return g_quark_from_static_string("milter");
- }
-
- static void
- rspamd_milter_obuf_free(struct rspamd_milter_outbuf *obuf)
- {
- if (obuf) {
- if (obuf->buf) {
- rspamd_fstring_free(obuf->buf);
- }
-
- g_free(obuf);
- }
- }
-
- #define RSPAMD_MILTER_RESET_COMMON (1 << 0)
- #define RSPAMD_MILTER_RESET_IO (1 << 1)
- #define RSPAMD_MILTER_RESET_ADDR (1 << 2)
- #define RSPAMD_MILTER_RESET_MACRO (1 << 3)
- #define RSPAMD_MILTER_RESET_ALL (RSPAMD_MILTER_RESET_COMMON | \
- RSPAMD_MILTER_RESET_IO | \
- RSPAMD_MILTER_RESET_ADDR | \
- RSPAMD_MILTER_RESET_MACRO)
- #define RSPAMD_MILTER_RESET_QUIT_NC (RSPAMD_MILTER_RESET_COMMON | \
- RSPAMD_MILTER_RESET_ADDR | \
- RSPAMD_MILTER_RESET_MACRO)
- #define RSPAMD_MILTER_RESET_ABORT (RSPAMD_MILTER_RESET_COMMON)
-
- static void
- rspamd_milter_session_reset(struct rspamd_milter_session *session,
- unsigned int how)
- {
- struct rspamd_milter_outbuf *obuf, *obuf_tmp;
- struct rspamd_milter_private *priv = session->priv;
- struct rspamd_email_address *cur;
- unsigned int i;
-
- if (how & RSPAMD_MILTER_RESET_IO) {
- msg_debug_milter("cleanup IO on abort");
-
- DL_FOREACH_SAFE(priv->out_chain, obuf, obuf_tmp)
- {
- rspamd_milter_obuf_free(obuf);
- }
-
- priv->out_chain = NULL;
-
- if (priv->parser.buf) {
- priv->parser.buf->len = 0;
- }
- }
-
- if (how & RSPAMD_MILTER_RESET_COMMON) {
- msg_debug_milter("cleanup common data on abort");
-
- if (session->message) {
- session->message->len = 0;
- msg_debug_milter("cleanup message on abort");
- }
-
- if (session->rcpts) {
- PTR_ARRAY_FOREACH(session->rcpts, i, cur)
- {
- rspamd_email_address_free(cur);
- }
-
- msg_debug_milter("cleanup %d recipients on abort",
- (int) session->rcpts->len);
-
- g_ptr_array_free(session->rcpts, TRUE);
- session->rcpts = NULL;
- }
-
- if (session->from) {
- msg_debug_milter("cleanup from");
- rspamd_email_address_free(session->from);
- session->from = NULL;
- }
-
- if (priv->headers) {
- msg_debug_milter("cleanup headers");
- char *k;
- GArray *ar;
-
- kh_foreach(priv->headers, k, ar, {
- g_free(k);
- g_array_free(ar, TRUE);
- });
-
- kh_clear(milter_headers_hash_t, priv->headers);
- }
-
- priv->cur_hdr = 0;
- }
-
- if (how & RSPAMD_MILTER_RESET_ADDR) {
- if (session->addr) {
- msg_debug_milter("cleanup addr");
- rspamd_inet_address_free(session->addr);
- session->addr = NULL;
- }
- if (session->hostname) {
- msg_debug_milter("cleanup hostname");
- session->hostname->len = 0;
- }
- }
-
- if (how & RSPAMD_MILTER_RESET_MACRO) {
- if (session->macros) {
- msg_debug_milter("cleanup macros");
- g_hash_table_unref(session->macros);
- session->macros = NULL;
- }
- }
- }
-
- static void
- rspamd_milter_session_dtor(struct rspamd_milter_session *session)
- {
- struct rspamd_milter_private *priv;
-
- if (session) {
- priv = session->priv;
- msg_debug_milter("destroying milter session");
-
- rspamd_ev_watcher_stop(priv->event_loop, &priv->ev);
- rspamd_milter_session_reset(session, RSPAMD_MILTER_RESET_ALL);
- close(priv->fd);
-
- if (priv->parser.buf) {
- rspamd_fstring_free(priv->parser.buf);
- }
-
- if (session->message) {
- rspamd_fstring_free(session->message);
- }
-
- if (session->helo) {
- rspamd_fstring_free(session->helo);
- }
-
- if (session->hostname) {
- rspamd_fstring_free(session->hostname);
- }
-
- if (priv->headers) {
- char *k;
- GArray *ar;
-
- kh_foreach(priv->headers, k, ar, {
- g_free(k);
- g_array_free(ar, TRUE);
- });
-
- kh_destroy(milter_headers_hash_t, priv->headers);
- }
-
- if (milter_ctx->sessions_cache) {
- rspamd_worker_session_cache_remove(milter_ctx->sessions_cache,
- session);
- }
-
- rspamd_mempool_delete(priv->pool);
- g_free(priv);
- g_free(session);
- }
- }
-
- static void
- rspamd_milter_on_protocol_error(struct rspamd_milter_session *session,
- struct rspamd_milter_private *priv, GError *err)
- {
- msg_debug_milter("protocol error: %e", err);
- priv->state = RSPAMD_MILTER_WANNA_DIE;
- REF_RETAIN(session);
- priv->err_cb(priv->fd, session, priv->ud, err);
- REF_RELEASE(session);
- g_error_free(err);
-
- rspamd_milter_plan_io(session, priv, EV_WRITE);
- }
-
- static void
- rspamd_milter_on_protocol_ping(struct rspamd_milter_session *session,
- struct rspamd_milter_private *priv)
- {
- GError *err = NULL;
- static const char reply[] = "HTTP/1.1 200 OK\r\n"
- "Connection: close\r\n"
- "Server: rspamd/2.7 (milter mode)\r\n"
- "Content-Length: 6\r\n"
- "Content-Type: text/plain\r\n"
- "\r\n"
- "pong\r\n";
-
- if (write(priv->fd, reply, sizeof(reply)) == -1) {
- int serrno = errno;
- msg_err_milter("cannot write pong reply: %s", strerror(serrno));
- g_set_error(&err, rspamd_milter_quark(), serrno, "ping command IO error: %s",
- strerror(serrno));
- priv->state = RSPAMD_MILTER_WANNA_DIE;
- REF_RETAIN(session);
- priv->err_cb(priv->fd, session, priv->ud, err);
- REF_RELEASE(session);
- g_error_free(err);
- }
- else {
- priv->state = RSPAMD_MILTER_PONG_AND_DIE;
- rspamd_milter_plan_io(session, priv, EV_WRITE);
- }
- }
-
- static int
- rspamd_milter_http_on_url(http_parser *parser, const char *at, size_t length)
- {
- GString *url = (GString *) parser->data;
-
- g_string_append_len(url, at, length);
-
- return 0;
- }
-
- static void
- rspamd_milter_io_handler(int fd, gshort what, void *ud)
- {
- struct rspamd_milter_session *session = ud;
- struct rspamd_milter_private *priv;
- GError *err;
-
- priv = session->priv;
-
- if (what == EV_TIMEOUT) {
- msg_debug_milter("connection timed out");
- err = g_error_new(rspamd_milter_quark(), ETIMEDOUT, "connection "
- "timed out");
- rspamd_milter_on_protocol_error(session, priv, err);
- }
- else {
- rspamd_milter_handle_session(session, priv);
- }
- }
-
- static inline void
- rspamd_milter_plan_io(struct rspamd_milter_session *session,
- struct rspamd_milter_private *priv, gshort what)
- {
- rspamd_ev_watcher_reschedule(priv->event_loop, &priv->ev, what);
- }
-
-
- #define READ_INT_32(pos, var) \
- do { \
- memcpy(&(var), (pos), sizeof(var)); \
- (pos) += sizeof(var); \
- (var) = ntohl(var); \
- } while (0)
- #define READ_INT_16(pos, var) \
- do { \
- memcpy(&(var), (pos), sizeof(var)); \
- (pos) += sizeof(var); \
- (var) = ntohs(var); \
- } while (0)
-
- static gboolean
- rspamd_milter_process_command(struct rspamd_milter_session *session,
- struct rspamd_milter_private *priv)
- {
- GError *err;
- rspamd_fstring_t *buf;
- const unsigned char *pos, *end, *zero;
- unsigned int cmdlen;
- uint32_t version, actions, protocol;
-
- buf = priv->parser.buf;
- pos = buf->str + priv->parser.cmd_start;
- cmdlen = priv->parser.datalen;
- end = pos + cmdlen;
-
- switch (priv->parser.cur_cmd) {
- case RSPAMD_MILTER_CMD_ABORT:
- msg_debug_milter("got abort command");
- rspamd_milter_session_reset(session, RSPAMD_MILTER_RESET_ABORT);
- break;
- case RSPAMD_MILTER_CMD_BODY:
- if (!session->message) {
- session->message = rspamd_fstring_sized_new(
- RSPAMD_MILTER_MESSAGE_CHUNK);
- }
-
- msg_debug_milter("got body chunk: %d bytes", (int) cmdlen);
- session->message = rspamd_fstring_append(session->message,
- pos, cmdlen);
- break;
- case RSPAMD_MILTER_CMD_CONNECT:
- msg_debug_milter("got connect command");
-
- /*
- * char hostname[]: Hostname, NUL terminated
- * char family: Protocol family
- * uint16 port: Port number (SMFIA_INET or SMFIA_INET6 only)
- * char address[]: IP address (ASCII) or unix socket path, NUL terminated
- */
- zero = memchr(pos, '\0', cmdlen);
-
- if (zero == NULL || zero > (end - sizeof(uint16_t) + 1)) {
- err = g_error_new(rspamd_milter_quark(), EINVAL, "invalid "
- "connect command (no name)");
- rspamd_milter_on_protocol_error(session, priv, err);
-
- return FALSE;
- }
- else {
- unsigned char proto;
- uint16_t port;
- char ip6_str[INET6_ADDRSTRLEN + 3];
- gsize r;
-
- /*
- * Important notice: Postfix do NOT use this command to pass
- * client's info (e.g. hostname is not really here)
- * Sendmail will pass it here
- */
- if (session->hostname == NULL) {
- session->hostname = rspamd_fstring_new_init(pos, zero - pos);
- msg_debug_milter("got hostname on connect phase: %V",
- session->hostname);
- }
- else {
- session->hostname = rspamd_fstring_assign(session->hostname,
- pos, zero - pos);
- msg_debug_milter("rewrote hostname on connect phase: %V",
- session->hostname);
- }
-
- pos = zero + 1;
- proto = *pos++;
-
- if (proto == RSPAMD_MILTER_CONN_UNKNOWN) {
- /* We have no information about host */
- msg_debug_milter("unknown connect address");
- }
- else {
- READ_INT_16(pos, port);
-
- if (pos >= end) {
- /* No IP somehow */
- msg_debug_milter("unknown connect IP/socket");
- }
- else {
- zero = memchr(pos, '\0', end - pos);
-
- if (zero == NULL) {
- err = g_error_new(rspamd_milter_quark(), EINVAL, "invalid "
- "connect command (no zero terminated IP)");
- rspamd_milter_on_protocol_error(session, priv, err);
-
- return FALSE;
- }
-
- switch (proto) {
- case RSPAMD_MILTER_CONN_UNIX:
- session->addr = rspamd_inet_address_new(AF_UNIX,
- pos);
- break;
-
- case RSPAMD_MILTER_CONN_INET:
- session->addr = rspamd_inet_address_new(AF_INET, NULL);
-
- if (!rspamd_parse_inet_address_ip(pos, zero - pos,
- session->addr)) {
- err = g_error_new(rspamd_milter_quark(), EINVAL,
- "invalid connect command (bad IPv4)");
- rspamd_milter_on_protocol_error(session, priv,
- err);
-
- return FALSE;
- }
-
- rspamd_inet_address_set_port(session->addr, port);
- break;
-
- case RSPAMD_MILTER_CONN_INET6:
- session->addr = rspamd_inet_address_new(AF_INET6, NULL);
-
- if (zero - pos > sizeof("IPv6:") &&
- rspamd_lc_cmp(pos, "IPv6:",
- sizeof("IPv6:") - 1) == 0) {
- /* Kill sendmail please */
- pos += sizeof("IPv6:") - 1;
-
- if (*pos != '[') {
- /* Add explicit braces */
- r = rspamd_snprintf(ip6_str, sizeof(ip6_str),
- "[%*s]", (int) (zero - pos), pos);
- }
- else {
- r = rspamd_strlcpy(ip6_str, pos, sizeof(ip6_str));
- }
- }
- else {
- r = rspamd_strlcpy(ip6_str, pos, sizeof(ip6_str));
- }
-
- if (!rspamd_parse_inet_address_ip(ip6_str, r,
- session->addr)) {
- err = g_error_new(rspamd_milter_quark(), EINVAL,
- "invalid connect command (bad IPv6)");
- rspamd_milter_on_protocol_error(session, priv,
- err);
-
- return FALSE;
- }
-
- rspamd_inet_address_set_port(session->addr, port);
- break;
-
- default:
- err = g_error_new(rspamd_milter_quark(), EINVAL,
- "invalid connect command (bad protocol: %c)",
- proto);
- rspamd_milter_on_protocol_error(session, priv,
- err);
-
- return FALSE;
- }
- }
- }
-
- msg_info_milter("got connection from %s",
- rspamd_inet_address_to_string_pretty(session->addr));
- }
- break;
- case RSPAMD_MILTER_CMD_MACRO:
- msg_debug_milter("got macro command");
- /*
- * Format is
- * 1 byte - command associated (we don't care about it)
- * 0-terminated name
- * 0-terminated value
- * ...
- */
- if (session->macros == NULL) {
- session->macros = g_hash_table_new_full(rspamd_ftok_icase_hash,
- rspamd_ftok_icase_equal,
- rspamd_fstring_mapped_ftok_free,
- rspamd_fstring_mapped_ftok_free);
- }
-
- /* Ignore one byte */
- pos++;
-
- while (pos < end) {
- zero = memchr(pos, '\0', cmdlen);
-
- if (zero == NULL || zero >= end) {
- err = g_error_new(rspamd_milter_quark(), EINVAL, "invalid "
- "macro command (no name)");
- rspamd_milter_on_protocol_error(session, priv, err);
-
- return FALSE;
- }
- else {
- rspamd_fstring_t *name, *value;
- rspamd_ftok_t *name_tok, *value_tok;
- const unsigned char *zero_val;
-
- zero_val = memchr(zero + 1, '\0', end - zero - 1);
-
- if (zero_val != NULL && end > zero_val) {
- name = rspamd_fstring_new_init(pos, zero - pos);
- value = rspamd_fstring_new_init(zero + 1,
- zero_val - zero - 1);
- name_tok = rspamd_ftok_map(name);
- value_tok = rspamd_ftok_map(value);
-
- g_hash_table_replace(session->macros, name_tok, value_tok);
- msg_debug_milter("got macro: %T -> %T",
- name_tok, value_tok);
-
- cmdlen -= zero_val - pos;
- pos = zero_val + 1;
- }
- else {
- err = g_error_new(rspamd_milter_quark(), EINVAL,
- "invalid macro command (bad value)");
- rspamd_milter_on_protocol_error(session, priv, err);
-
- return FALSE;
- }
- }
- }
- break;
- case RSPAMD_MILTER_CMD_BODYEOB:
- msg_debug_milter("got eob command");
- REF_RETAIN(session);
- priv->fin_cb(priv->fd, session, priv->ud);
- REF_RELEASE(session);
- break;
- case RSPAMD_MILTER_CMD_HELO:
- msg_debug_milter("got helo command");
-
- if (end > pos && *(end - 1) == '\0') {
- if (session->helo == NULL) {
- session->helo = rspamd_fstring_new_init(pos, cmdlen - 1);
- }
- else {
- session->helo = rspamd_fstring_assign(session->helo,
- pos, cmdlen - 1);
- }
- }
- else if (end > pos) {
- /* Should not happen */
- if (session->helo == NULL) {
- session->helo = rspamd_fstring_new_init(pos, cmdlen);
- }
- else {
- session->helo = rspamd_fstring_assign(session->helo,
- pos, cmdlen);
- }
- }
-
- msg_debug_milter("got helo value: %V", session->helo);
-
- break;
- case RSPAMD_MILTER_CMD_QUIT_NC:
- /* We need to reset session and start over */
- msg_debug_milter("got quit_nc command");
- rspamd_milter_session_reset(session, RSPAMD_MILTER_RESET_QUIT_NC);
- break;
- case RSPAMD_MILTER_CMD_HEADER:
- msg_debug_milter("got header command");
- if (!session->message) {
- session->message = rspamd_fstring_sized_new(
- RSPAMD_MILTER_MESSAGE_CHUNK);
- }
- zero = memchr(pos, '\0', cmdlen);
-
- if (zero == NULL) {
- err = g_error_new(rspamd_milter_quark(), EINVAL, "invalid "
- "header command (no name)");
- rspamd_milter_on_protocol_error(session, priv, err);
-
- return FALSE;
- }
- else {
- if (end > zero && *(end - 1) == '\0') {
- khiter_t k;
- int res;
-
- k = kh_get(milter_headers_hash_t, priv->headers, (char *) pos);
-
- if (k == kh_end(priv->headers)) {
- GArray *ar;
-
- k = kh_put(milter_headers_hash_t, priv->headers,
- g_strdup(pos), &res);
- ar = g_array_new(FALSE, FALSE, sizeof(int));
- g_array_append_val(ar, priv->cur_hdr);
- kh_value(priv->headers, k) = ar;
- }
- else {
- g_array_append_val(kh_value(priv->headers, k),
- priv->cur_hdr);
- }
-
- rspamd_printf_fstring(&session->message, "%*s: %*s\r\n",
- (int) (zero - pos), pos,
- (int) (end - zero - 2), zero + 1);
- priv->cur_hdr++;
- }
- else {
- err = g_error_new(rspamd_milter_quark(), EINVAL, "invalid "
- "header command (bad value)");
- rspamd_milter_on_protocol_error(session, priv, err);
-
- return FALSE;
- }
- }
- break;
- case RSPAMD_MILTER_CMD_MAIL:
- msg_debug_milter("mail command");
-
- while (pos < end) {
- struct rspamd_email_address *addr;
- char *cpy;
-
- zero = memchr(pos, '\0', end - pos);
-
- if (zero && zero > pos) {
- cpy = rspamd_mempool_alloc(priv->pool, zero - pos);
- memcpy(cpy, pos, zero - pos);
- msg_debug_milter("got mail: %*s", (int) (zero - pos), cpy);
- addr = rspamd_email_address_from_smtp(cpy, zero - pos);
-
- if (addr) {
- session->from = addr;
- }
-
- /* TODO: parse esmtp arguments */
- break;
- }
- else {
- msg_debug_milter("got weird from: %*s", (int) (end - pos),
- pos);
- /* That actually should not happen */
- cpy = rspamd_mempool_alloc(priv->pool, end - pos);
- memcpy(cpy, pos, end - pos);
- addr = rspamd_email_address_from_smtp(cpy, end - pos);
-
- if (addr) {
- session->from = addr;
- }
-
- break;
- }
- }
- break;
- case RSPAMD_MILTER_CMD_EOH:
- msg_debug_milter("got eoh command");
-
- if (!session->message) {
- session->message = rspamd_fstring_sized_new(
- RSPAMD_MILTER_MESSAGE_CHUNK);
- }
-
- session->message = rspamd_fstring_append(session->message,
- "\r\n", 2);
- break;
- case RSPAMD_MILTER_CMD_OPTNEG:
- if (cmdlen != sizeof(uint32_t) * 3) {
- err = g_error_new(rspamd_milter_quark(), EINVAL, "invalid "
- "optneg command");
- rspamd_milter_on_protocol_error(session, priv, err);
-
- return FALSE;
- }
-
- READ_INT_32(pos, version);
- READ_INT_32(pos, actions);
- READ_INT_32(pos, protocol);
-
- msg_debug_milter("optneg: version: %d, actions: %d, protocol: %d",
- version, actions, protocol);
-
- if (version < RSPAMD_MILTER_PROTO_VER) {
- msg_warn_milter("MTA specifies too old protocol: %d, "
- "aborting connection",
- version);
-
- err = g_error_new(rspamd_milter_quark(), EINVAL, "invalid "
- "protocol version: %d",
- version);
- rspamd_milter_on_protocol_error(session, priv, err);
-
- return FALSE;
- }
-
- version = RSPAMD_MILTER_PROTO_VER;
- actions |= RSPAMD_MILTER_ACTIONS_MASK;
- protocol = RSPAMD_MILTER_FLAG_NOREPLY_MASK;
-
- return rspamd_milter_send_action(session, RSPAMD_MILTER_OPTNEG,
- version, actions, protocol);
- break;
- case RSPAMD_MILTER_CMD_QUIT:
- if (priv->out_chain) {
- msg_debug_milter("quit command, refcount: %d, "
- "some output buffers left - draining",
- session->ref.refcount);
-
- priv->state = RSPAMD_MILTER_WRITE_AND_DIE;
- }
- else {
- msg_debug_milter("quit command, refcount: %d",
- session->ref.refcount);
-
- priv->state = RSPAMD_MILTER_WANNA_DIE;
- REF_RETAIN(session);
- priv->fin_cb(priv->fd, session, priv->ud);
- REF_RELEASE(session);
- return FALSE;
- }
- break;
- case RSPAMD_MILTER_CMD_RCPT:
- msg_debug_milter("rcpt command");
-
- while (pos < end) {
- struct rspamd_email_address *addr;
- char *cpy;
-
- zero = memchr(pos, '\0', end - pos);
-
- if (zero && zero > pos) {
- cpy = rspamd_mempool_alloc(priv->pool, end - pos);
- memcpy(cpy, pos, end - pos);
-
- msg_debug_milter("got rcpt: %*s", (int) (zero - pos), cpy);
- addr = rspamd_email_address_from_smtp(cpy, zero - pos);
-
- if (addr) {
- if (!session->rcpts) {
- session->rcpts = g_ptr_array_sized_new(1);
- }
-
- g_ptr_array_add(session->rcpts, addr);
- }
-
- pos = zero + 1;
- }
- else {
- cpy = rspamd_mempool_alloc(priv->pool, end - pos);
- memcpy(cpy, pos, end - pos);
-
- msg_debug_milter("got weird rcpt: %*s", (int) (end - pos),
- pos);
- /* That actually should not happen */
- addr = rspamd_email_address_from_smtp(cpy, end - pos);
-
- if (addr) {
- if (!session->rcpts) {
- session->rcpts = g_ptr_array_sized_new(1);
- }
-
- g_ptr_array_add(session->rcpts, addr);
- }
-
- break;
- }
- }
- break;
- case RSPAMD_MILTER_CMD_DATA:
- if (!session->message) {
- session->message = rspamd_fstring_sized_new(
- RSPAMD_MILTER_MESSAGE_CHUNK);
- }
- msg_debug_milter("got data command");
- /* We do not need reply as specified */
- break;
- default:
- msg_debug_milter("got bad command: %c", priv->parser.cur_cmd);
- break;
- }
-
- return TRUE;
- }
-
- static gboolean
- rspamd_milter_is_valid_cmd(unsigned char c)
- {
- switch (c) {
- case RSPAMD_MILTER_CMD_ABORT:
- case RSPAMD_MILTER_CMD_BODY:
- case RSPAMD_MILTER_CMD_CONNECT:
- case RSPAMD_MILTER_CMD_MACRO:
- case RSPAMD_MILTER_CMD_BODYEOB:
- case RSPAMD_MILTER_CMD_HELO:
- case RSPAMD_MILTER_CMD_QUIT_NC:
- case RSPAMD_MILTER_CMD_HEADER:
- case RSPAMD_MILTER_CMD_MAIL:
- case RSPAMD_MILTER_CMD_EOH:
- case RSPAMD_MILTER_CMD_OPTNEG:
- case RSPAMD_MILTER_CMD_QUIT:
- case RSPAMD_MILTER_CMD_RCPT:
- case RSPAMD_MILTER_CMD_DATA:
- case RSPAMD_MILTER_CMD_UNKNOWN:
- return TRUE;
- default:
- break;
- }
-
- return FALSE;
- }
-
- static gboolean
- rspamd_milter_consume_input(struct rspamd_milter_session *session,
- struct rspamd_milter_private *priv)
- {
- const unsigned char *p, *end;
- GError *err;
-
- p = priv->parser.buf->str + priv->parser.pos;
- end = priv->parser.buf->str + priv->parser.buf->len;
-
- while (p < end) {
- msg_debug_milter("offset: %d, state: %d",
- (int) (p - (const unsigned char *) priv->parser.buf->str),
- priv->parser.state);
-
- switch (priv->parser.state) {
- case st_len_1:
- /* The first length byte in big endian order */
- priv->parser.datalen = 0;
- priv->parser.datalen |= ((gsize) *p) << 24;
- priv->parser.state = st_len_2;
- p++;
- break;
- case st_len_2:
- /* The second length byte in big endian order */
- priv->parser.datalen |= ((gsize) *p) << 16;
- priv->parser.state = st_len_3;
- p++;
- break;
- case st_len_3:
- /* The third length byte in big endian order */
- priv->parser.datalen |= ((gsize) *p) << 8;
- priv->parser.state = st_len_4;
- p++;
- break;
- case st_len_4:
- /* The fourth length byte in big endian order */
- priv->parser.datalen |= ((gsize) *p);
- priv->parser.state = st_read_cmd;
- p++;
- break;
- case st_read_cmd:
- priv->parser.cur_cmd = *p;
- priv->parser.state = st_read_data;
-
- if (priv->parser.datalen < 1) {
- err = g_error_new(rspamd_milter_quark(), EINVAL,
- "Command length is too short");
- rspamd_milter_on_protocol_error(session, priv, err);
-
- return FALSE;
- }
- else {
- /* Eat command itself */
- priv->parser.datalen--;
- }
-
- p++;
- priv->parser.cmd_start = p - (const unsigned char *) priv->parser.buf->str;
- break;
- case st_read_data:
- /* We might need some more data in buffer for further steps */
- if (priv->parser.datalen >
- RSPAMD_MILTER_MESSAGE_CHUNK * 2) {
- /* Check if we have HTTP input instead of milter */
- if (priv->parser.buf->len > sizeof("GET") &&
- memcmp(priv->parser.buf->str, "GET", 3) == 0) {
- struct http_parser http_parser;
- struct http_parser_settings http_callbacks;
- GString *url = g_string_new(NULL);
-
- /* Hack, hack, hack */
- /*
- * This code is assumed to read `/ping` command and
- * handle it to monitor port's availability since
- * milter protocol is stupid and does not allow to do that
- * This code also assumes that HTTP request can be read
- * as as single data chunk which is not true in some cases
- * In general, don't use it for anything but ping checks
- */
- memset(&http_callbacks, 0, sizeof(http_callbacks));
- http_parser.data = url;
- http_parser_init(&http_parser, HTTP_REQUEST);
- http_callbacks.on_url = rspamd_milter_http_on_url;
- http_parser_execute(&http_parser, &http_callbacks,
- priv->parser.buf->str, priv->parser.buf->len);
-
- if (url->len == sizeof("/ping") - 1 &&
- rspamd_lc_cmp(url->str, "/ping", url->len) == 0) {
- rspamd_milter_on_protocol_ping(session, priv);
- g_string_free(url, TRUE);
-
- return TRUE;
- }
- else {
- err = g_error_new(rspamd_milter_quark(), EINVAL,
- "HTTP GET request is not supported in milter mode, url: %s",
- url->str);
- }
-
- g_string_free(url, TRUE);
- }
- else if (priv->parser.buf->len > sizeof("POST") &&
- memcmp(priv->parser.buf->str, "POST", 4) == 0) {
- err = g_error_new(rspamd_milter_quark(), EINVAL,
- "HTTP POST request is not supported in milter mode");
- }
- else {
- err = g_error_new(rspamd_milter_quark(), E2BIG,
- "Command length is too big: %zd",
- priv->parser.datalen);
- }
-
- rspamd_milter_on_protocol_error(session, priv, err);
-
- return FALSE;
- }
- if (!rspamd_milter_is_valid_cmd(priv->parser.cur_cmd)) {
- err = g_error_new(rspamd_milter_quark(), E2BIG,
- "Unvalid command: %c",
- priv->parser.cur_cmd);
- rspamd_milter_on_protocol_error(session, priv, err);
-
- return FALSE;
- }
- if (priv->parser.buf->allocated < priv->parser.datalen) {
- priv->parser.pos = p - (const unsigned char *) priv->parser.buf->str;
- priv->parser.buf = rspamd_fstring_grow(priv->parser.buf,
- priv->parser.buf->len + priv->parser.datalen);
- /* This can realloc buffer */
- rspamd_milter_plan_io(session, priv, EV_READ);
- goto end;
- }
- else {
- /* We may have the full command available */
- if (p + priv->parser.datalen <= end) {
- /* We can process command */
- if (!rspamd_milter_process_command(session, priv)) {
- return FALSE;
- }
-
- p += priv->parser.datalen;
- priv->parser.state = st_len_1;
- priv->parser.cur_cmd = '\0';
- priv->parser.cmd_start = 0;
- }
- else {
- /* Need to read more */
- priv->parser.pos = p - (const unsigned char *) priv->parser.buf->str;
- rspamd_milter_plan_io(session, priv, EV_READ);
- goto end;
- }
- }
- break;
- }
- }
-
- /* Leftover */
- switch (priv->parser.state) {
- case st_read_data:
- if (p + priv->parser.datalen <= end) {
- if (!rspamd_milter_process_command(session, priv)) {
- return FALSE;
- }
-
- priv->parser.state = st_len_1;
- priv->parser.cur_cmd = '\0';
- priv->parser.cmd_start = 0;
- }
- break;
- default:
- /* No need to do anything */
- break;
- }
-
- if (p == end) {
- priv->parser.buf->len = 0;
- priv->parser.pos = 0;
- priv->parser.cmd_start = 0;
- }
-
- if (priv->out_chain) {
- rspamd_milter_plan_io(session, priv, EV_READ | EV_WRITE);
- }
- else {
- rspamd_milter_plan_io(session, priv, EV_READ);
- }
- end:
-
- return TRUE;
- }
-
- static gboolean
- rspamd_milter_handle_session(struct rspamd_milter_session *session,
- struct rspamd_milter_private *priv)
- {
- struct rspamd_milter_outbuf *obuf, *obuf_tmp;
- gssize r, to_write;
- GError *err;
-
- g_assert(session != NULL);
-
- switch (priv->state) {
- case RSPAMD_MILTER_READ_MORE:
- if (priv->parser.buf->len >= priv->parser.buf->allocated) {
- priv->parser.buf = rspamd_fstring_grow(priv->parser.buf,
- priv->parser.buf->len * 2);
- }
-
- r = read(priv->fd, priv->parser.buf->str + priv->parser.buf->len,
- priv->parser.buf->allocated - priv->parser.buf->len);
-
- msg_debug_milter("read %z bytes, %z remain, %z allocated",
- r, priv->parser.buf->len, priv->parser.buf->allocated);
-
- if (r == -1) {
- if (errno == EAGAIN || errno == EINTR) {
- rspamd_milter_plan_io(session, priv, EV_READ);
-
- return TRUE;
- }
- else {
- /* Fatal IO error */
- err = g_error_new(rspamd_milter_quark(), errno,
- "IO read error: %s", strerror(errno));
- REF_RETAIN(session);
- priv->err_cb(priv->fd, session, priv->ud, err);
- REF_RELEASE(session);
- g_error_free(err);
-
- REF_RELEASE(session);
-
- return FALSE;
- }
- }
- else if (r == 0) {
- err = g_error_new(rspamd_milter_quark(), ECONNRESET,
- "Unexpected EOF");
- REF_RETAIN(session);
- priv->err_cb(priv->fd, session, priv->ud, err);
- REF_RELEASE(session);
- g_error_free(err);
-
- REF_RELEASE(session);
-
- return FALSE;
- }
- else {
- priv->parser.buf->len += r;
-
- return rspamd_milter_consume_input(session, priv);
- }
-
- break;
- case RSPAMD_MILTER_WRITE_REPLY:
- case RSPAMD_MILTER_WRITE_AND_DIE:
- if (priv->out_chain == NULL) {
- if (priv->state == RSPAMD_MILTER_WRITE_AND_DIE) {
- /* Finished writing, let's die finally */
- msg_debug_milter("output drained, terminating, refcount: %d",
- session->ref.refcount);
-
- /* Session should be destroyed by fin_cb... */
- REF_RETAIN(session);
- priv->fin_cb(priv->fd, session, priv->ud);
- REF_RELEASE(session);
-
- return FALSE;
- }
- else {
- /* We have written everything, so we can read something */
- priv->state = RSPAMD_MILTER_READ_MORE;
- rspamd_milter_plan_io(session, priv, EV_READ);
- }
- }
- else {
- DL_FOREACH_SAFE(priv->out_chain, obuf, obuf_tmp)
- {
- to_write = obuf->buf->len - obuf->pos;
-
- g_assert(to_write > 0);
-
- r = write(priv->fd, obuf->buf->str + obuf->pos, to_write);
-
- if (r == -1) {
- if (errno == EAGAIN || errno == EINTR) {
- rspamd_milter_plan_io(session, priv, EV_WRITE);
- }
- else {
- /* Fatal IO error */
- err = g_error_new(rspamd_milter_quark(), errno,
- "IO write error: %s", strerror(errno));
- REF_RETAIN(session);
- priv->err_cb(priv->fd, session, priv->ud, err);
- REF_RELEASE(session);
- g_error_free(err);
-
- REF_RELEASE(session);
-
- return FALSE;
- }
- }
- else if (r == 0) {
- err = g_error_new(rspamd_milter_quark(), ECONNRESET,
- "Unexpected EOF");
- REF_RETAIN(session);
- priv->err_cb(priv->fd, session, priv->ud, err);
- REF_RELEASE(session);
- g_error_free(err);
-
- REF_RELEASE(session);
-
- return FALSE;
- }
- else {
- if (r == to_write) {
- /* We have done with this buf */
- DL_DELETE(priv->out_chain, obuf);
- rspamd_milter_obuf_free(obuf);
- }
- else {
- /* We need to plan another write */
- obuf->pos += r;
- rspamd_milter_plan_io(session, priv, EV_WRITE);
-
- return TRUE;
- }
- }
- }
-
- /* Here we have written everything, so we can plan reading */
- priv->state = RSPAMD_MILTER_READ_MORE;
- rspamd_milter_plan_io(session, priv, EV_READ);
- }
- break;
- case RSPAMD_MILTER_WANNA_DIE:
- /* We are here after processing everything, so release session */
- REF_RELEASE(session);
- return FALSE;
- break;
- case RSPAMD_MILTER_PONG_AND_DIE:
- err = g_error_new(rspamd_milter_quark(), 0,
- "ping command");
- REF_RETAIN(session);
- priv->err_cb(priv->fd, session, priv->ud, err);
- REF_RELEASE(session);
- g_error_free(err);
- REF_RELEASE(session);
- return FALSE;
- break;
- }
-
- return TRUE;
- }
-
-
- gboolean
- rspamd_milter_handle_socket(int fd, ev_tstamp timeout,
- rspamd_mempool_t *pool,
- struct ev_loop *ev_base, rspamd_milter_finish finish_cb,
- rspamd_milter_error error_cb, void *ud)
- {
- struct rspamd_milter_session *session;
- struct rspamd_milter_private *priv;
- int nfd = dup(fd);
-
- if (nfd == -1) {
- GError *err = g_error_new(rspamd_milter_quark(), errno,
- "dup failed: %s", strerror(errno));
- error_cb(fd, NULL, ud, err);
-
- return FALSE;
- }
-
- g_assert(finish_cb != NULL);
- g_assert(error_cb != NULL);
- g_assert(milter_ctx != NULL);
-
- session = g_malloc0(sizeof(*session));
- priv = g_malloc0(sizeof(*priv));
- priv->fd = nfd;
- priv->ud = ud;
- priv->fin_cb = finish_cb;
- priv->err_cb = error_cb;
- priv->parser.state = st_len_1;
- priv->parser.buf = rspamd_fstring_sized_new(RSPAMD_MILTER_MESSAGE_CHUNK + 5);
- priv->event_loop = ev_base;
- priv->state = RSPAMD_MILTER_READ_MORE;
- priv->pool = rspamd_mempool_new(rspamd_mempool_suggest_size(), "milter", 0);
- priv->discard_on_reject = milter_ctx->discard_on_reject;
- priv->quarantine_on_reject = milter_ctx->quarantine_on_reject;
- priv->ev.timeout = timeout;
-
- rspamd_ev_watcher_init(&priv->ev, priv->fd, EV_READ | EV_WRITE,
- rspamd_milter_io_handler, session);
-
- if (pool) {
- /* Copy tag */
- memcpy(priv->pool->tag.uid, pool->tag.uid, sizeof(pool->tag.uid));
- }
-
- priv->headers = kh_init(milter_headers_hash_t);
- kh_resize(milter_headers_hash_t, priv->headers, 32);
-
- session->priv = priv;
- REF_INIT_RETAIN(session, rspamd_milter_session_dtor);
-
- if (milter_ctx->sessions_cache) {
- rspamd_worker_session_cache_add(milter_ctx->sessions_cache,
- priv->pool->tag.uid, &session->ref.refcount, session);
- }
-
- return rspamd_milter_handle_session(session, priv);
- }
-
- gboolean
- rspamd_milter_set_reply(struct rspamd_milter_session *session,
- rspamd_fstring_t *rcode,
- rspamd_fstring_t *xcode,
- rspamd_fstring_t *reply)
- {
- GString *buf;
- gboolean ret;
-
- buf = g_string_sized_new(xcode->len + rcode->len + reply->len + 2);
- rspamd_printf_gstring(buf, "%V %V %V", rcode, xcode, reply);
- ret = rspamd_milter_send_action(session, RSPAMD_MILTER_REPLYCODE,
- buf);
- g_string_free(buf, TRUE);
-
- return ret;
- }
-
- #define SET_COMMAND(cmd, sz, reply, pos) \
- do { \
- uint32_t _len; \
- _len = (sz) + 1; \
- (reply) = rspamd_fstring_sized_new(sizeof(_len) + _len); \
- (reply)->len = sizeof(_len) + _len; \
- _len = htonl(_len); \
- memcpy((reply)->str, &_len, sizeof(_len)); \
- (reply)->str[sizeof(_len)] = (cmd); \
- (pos) = (unsigned char *) (reply)->str + sizeof(_len) + 1; \
- } while (0)
-
- gboolean
- rspamd_milter_send_action(struct rspamd_milter_session *session,
- enum rspamd_milter_reply act, ...)
- {
- uint32_t ver, actions, protocol, idx;
- va_list ap;
- unsigned char cmd, *pos;
- rspamd_fstring_t *reply = NULL;
- gsize len;
- GString *name, *value;
- const char *body_str;
- struct rspamd_milter_outbuf *obuf;
- struct rspamd_milter_private *priv = session->priv;
- const rspamd_fstring_t *reason;
-
- va_start(ap, act);
- cmd = act;
-
- switch (act) {
- case RSPAMD_MILTER_ACCEPT:
- case RSPAMD_MILTER_CONTINUE:
- case RSPAMD_MILTER_DISCARD:
- case RSPAMD_MILTER_PROGRESS:
- case RSPAMD_MILTER_REJECT:
- case RSPAMD_MILTER_TEMPFAIL:
- /* No additional arguments */
- msg_debug_milter("send %c command", cmd);
- SET_COMMAND(cmd, 0, reply, pos);
- break;
- case RSPAMD_MILTER_QUARANTINE:
- reason = va_arg(ap, const rspamd_fstring_t *);
-
- if (reason != NULL) {
- len = reason->len;
- msg_debug_milter("send quarantine action %*s", (int) len, reason->str);
- SET_COMMAND(cmd, len + 1, reply, pos);
- memcpy(pos, reason->str, len);
- pos[len] = '\0';
- }
- else {
- msg_debug_milter("send quarantine action with no specific string");
- SET_COMMAND(cmd, 1, reply, pos);
- *pos = '\0';
- }
-
- break;
- case RSPAMD_MILTER_ADDHEADER:
- name = va_arg(ap, GString *);
- value = va_arg(ap, GString *);
-
- /* Name and value must be zero terminated */
- msg_debug_milter("add header command - \"%v\"=\"%v\"", name, value);
- SET_COMMAND(cmd, name->len + value->len + 2, reply, pos);
- memcpy(pos, name->str, name->len + 1);
- pos += name->len + 1;
- memcpy(pos, value->str, value->len + 1);
- break;
- case RSPAMD_MILTER_CHGHEADER:
- case RSPAMD_MILTER_INSHEADER:
- idx = va_arg(ap, uint32_t);
- name = va_arg(ap, GString *);
- value = va_arg(ap, GString *);
-
- msg_debug_milter("change/insert header command pos = %d- \"%v\"=\"%v\"",
- idx, name, value);
- /* Name and value must be zero terminated */
- SET_COMMAND(cmd, name->len + value->len + 2 + sizeof(uint32_t),
- reply, pos);
- idx = htonl(idx);
- memcpy(pos, &idx, sizeof(idx));
- pos += sizeof(idx);
- memcpy(pos, name->str, name->len + 1);
- pos += name->len + 1;
- memcpy(pos, value->str, value->len + 1);
- break;
- case RSPAMD_MILTER_REPLBODY:
- len = va_arg(ap, gsize);
- body_str = va_arg(ap, const char *);
- msg_debug_milter("want to change body; size = %uz",
- len);
- SET_COMMAND(cmd, len, reply, pos);
- memcpy(pos, body_str, len);
- break;
- case RSPAMD_MILTER_REPLYCODE:
- case RSPAMD_MILTER_ADDRCPT:
- case RSPAMD_MILTER_DELRCPT:
- case RSPAMD_MILTER_CHGFROM:
- /* Single GString * argument */
- value = va_arg(ap, GString *);
- msg_debug_milter("command %c; value=%v", cmd, value);
- SET_COMMAND(cmd, value->len + 1, reply, pos);
- memcpy(pos, value->str, value->len + 1);
- break;
- case RSPAMD_MILTER_OPTNEG:
- ver = va_arg(ap, uint32_t);
- actions = va_arg(ap, uint32_t);
- protocol = va_arg(ap, uint32_t);
-
- msg_debug_milter("optneg reply: ver=%d, actions=%d, protocol=%d",
- ver, actions, protocol);
- ver = htonl(ver);
- actions = htonl(actions);
- protocol = htonl(protocol);
- SET_COMMAND(cmd, sizeof(uint32_t) * 3, reply, pos);
- memcpy(pos, &ver, sizeof(ver));
- pos += sizeof(ver);
- memcpy(pos, &actions, sizeof(actions));
- pos += sizeof(actions);
- memcpy(pos, &protocol, sizeof(protocol));
- break;
- default:
- msg_err_milter("invalid command: %c", cmd);
- break;
- }
-
- va_end(ap);
-
- if (reply) {
- obuf = g_malloc(sizeof(*obuf));
- obuf->buf = reply;
- obuf->pos = 0;
- DL_APPEND(priv->out_chain, obuf);
- priv->state = RSPAMD_MILTER_WRITE_REPLY;
- rspamd_milter_plan_io(session, priv, EV_WRITE);
-
- return TRUE;
- }
-
- return FALSE;
- }
-
- gboolean
- rspamd_milter_add_header(struct rspamd_milter_session *session,
- GString *name, GString *value)
- {
- return rspamd_milter_send_action(session, RSPAMD_MILTER_ADDHEADER,
- name, value);
- }
-
- gboolean
- rspamd_milter_del_header(struct rspamd_milter_session *session,
- GString *name)
- {
- GString value;
- uint32_t idx = 1;
-
- value.str = (char *) "";
- value.len = 0;
-
- return rspamd_milter_send_action(session, RSPAMD_MILTER_CHGHEADER,
- idx, name, &value);
- }
-
- void rspamd_milter_session_unref(struct rspamd_milter_session *session)
- {
- REF_RELEASE(session);
- }
-
- struct rspamd_milter_session *
- rspamd_milter_session_ref(struct rspamd_milter_session *session)
- {
- REF_RETAIN(session);
-
- return session;
- }
-
- #define IF_MACRO(lit) \
- RSPAMD_FTOK_ASSIGN(&srch, (lit)); \
- found = g_hash_table_lookup(session->macros, &srch); \
- if (found)
-
- static void
- rspamd_milter_macro_http(struct rspamd_milter_session *session,
- struct rspamd_http_message *msg)
- {
- rspamd_ftok_t *found, srch;
- struct rspamd_milter_private *priv = session->priv;
-
- /*
- * We assume postfix macros here, sendmail ones might be slightly
- * different
- */
-
- if (!session->macros) {
- return;
- }
-
- IF_MACRO("{i}")
- {
- rspamd_http_message_add_header_len(msg, QUEUE_ID_HEADER,
- found->begin, found->len);
- }
- else
- {
- IF_MACRO("i")
- {
- rspamd_http_message_add_header_len(msg, QUEUE_ID_HEADER,
- found->begin, found->len);
- }
- }
-
- IF_MACRO("{v}")
- {
- rspamd_http_message_add_header_len(msg, USER_AGENT_HEADER,
- found->begin, found->len);
- }
- else
- {
- IF_MACRO("v")
- {
- rspamd_http_message_add_header_len(msg, USER_AGENT_HEADER,
- found->begin, found->len);
- }
- }
-
- IF_MACRO("{cipher}")
- {
- rspamd_http_message_add_header_len(msg, TLS_CIPHER_HEADER,
- found->begin, found->len);
- }
-
- IF_MACRO("{tls_version}")
- {
- rspamd_http_message_add_header_len(msg, TLS_VERSION_HEADER,
- found->begin, found->len);
- }
-
- IF_MACRO("{auth_authen}")
- {
- rspamd_http_message_add_header_len(msg, USER_HEADER,
- found->begin, found->len);
- }
-
- IF_MACRO("{rcpt_mailer}")
- {
- rspamd_http_message_add_header_len(msg, MAILER_HEADER,
- found->begin, found->len);
- }
-
- if (milter_ctx->client_ca_name) {
- IF_MACRO("{cert_issuer}")
- {
- rspamd_http_message_add_header_len(msg, CERT_ISSUER_HEADER,
- found->begin, found->len);
-
- if (found->len == strlen(milter_ctx->client_ca_name) &&
- rspamd_cryptobox_memcmp(found->begin,
- milter_ctx->client_ca_name, found->len) == 0) {
- msg_debug_milter("process certificate issued by %T", found);
- IF_MACRO("{cert_subject}")
- {
- rspamd_http_message_add_header_len(msg, USER_HEADER,
- found->begin, found->len);
- }
- }
- else {
- msg_debug_milter("skip certificate issued by %T", found);
- }
- }
- }
- else {
- IF_MACRO("{cert_issuer}")
- {
- rspamd_http_message_add_header_len(msg, CERT_ISSUER_HEADER,
- found->begin, found->len);
- }
- }
-
- if (!session->hostname || session->hostname->len == 0) {
- IF_MACRO("{client_name}")
- {
- if (!(found->len == sizeof("unknown") - 1 &&
- memcmp(found->begin, "unknown",
- sizeof("unknown") - 1) == 0)) {
- rspamd_http_message_add_header_len(msg, HOSTNAME_HEADER,
- found->begin, found->len);
- }
- else {
- msg_debug_milter("skip unknown hostname from being added");
- }
- }
- }
-
- IF_MACRO("{daemon_name}")
- {
- /* Postfix style */
- rspamd_http_message_add_header_len(msg, MTA_NAME_HEADER,
- found->begin, found->len);
- }
- else
- {
- /* Sendmail style */
- IF_MACRO("{j}")
- {
- rspamd_http_message_add_header_len(msg, MTA_NAME_HEADER,
- found->begin, found->len);
- }
- else
- {
- IF_MACRO("j")
- {
- rspamd_http_message_add_header_len(msg, MTA_NAME_HEADER,
- found->begin, found->len);
- }
- }
- }
- }
-
- struct rspamd_http_message *
- rspamd_milter_to_http(struct rspamd_milter_session *session)
- {
- struct rspamd_http_message *msg;
- unsigned int i;
- struct rspamd_email_address *rcpt;
- struct rspamd_milter_private *priv = session->priv;
-
- g_assert(session != NULL);
-
- msg = rspamd_http_new_message(HTTP_REQUEST);
-
- msg->url = rspamd_fstring_assign(msg->url, "/" MSG_CMD_CHECK_V2,
- sizeof("/" MSG_CMD_CHECK_V2) - 1);
-
- if (session->message) {
- rspamd_http_message_set_body_from_fstring_steal(msg, session->message);
- session->message = NULL;
- }
-
- if (session->hostname && RSPAMD_FSTRING_LEN(session->hostname) > 0) {
- if (!(session->hostname->len == sizeof("unknown") - 1 &&
- memcmp(RSPAMD_FSTRING_DATA(session->hostname), "unknown",
- sizeof("unknown") - 1) == 0)) {
- rspamd_http_message_add_header_fstr(msg, HOSTNAME_HEADER,
- session->hostname);
- }
- else {
- msg_debug_milter("skip unknown hostname from being added");
- }
- }
-
- if (session->helo && session->helo->len > 0) {
- rspamd_http_message_add_header_fstr(msg, HELO_HEADER,
- session->helo);
- }
-
- if (session->from) {
- rspamd_http_message_add_header_len(msg, FROM_HEADER,
- session->from->raw, session->from->raw_len);
- }
-
- if (session->rcpts) {
- PTR_ARRAY_FOREACH(session->rcpts, i, rcpt)
- {
- rspamd_http_message_add_header_len(msg, RCPT_HEADER,
- rcpt->raw, rcpt->raw_len);
- }
- }
-
- if (session->addr) {
- if (rspamd_inet_address_get_af(session->addr) != AF_UNIX) {
- rspamd_http_message_add_header(msg, IP_ADDR_HEADER,
- rspamd_inet_address_to_string_pretty(session->addr));
- }
- else {
- rspamd_http_message_add_header(msg, IP_ADDR_HEADER,
- rspamd_inet_address_to_string(session->addr));
- }
- }
-
- rspamd_milter_macro_http(session, msg);
- rspamd_http_message_add_header(msg, FLAGS_HEADER, "milter,body_block");
-
- return msg;
- }
-
- void *
- rspamd_milter_update_userdata(struct rspamd_milter_session *session,
- void *ud)
- {
- struct rspamd_milter_private *priv = session->priv;
- void *prev_ud;
-
- prev_ud = priv->ud;
- priv->ud = ud;
-
- return prev_ud;
- }
-
- static void
- rspamd_milter_remove_header_safe(struct rspamd_milter_session *session,
- const char *key, int nhdr)
- {
- int i;
- GString *hname, *hvalue;
- struct rspamd_milter_private *priv = session->priv;
- khiter_t k;
- GArray *ar;
-
- k = kh_get(milter_headers_hash_t, priv->headers, (char *) key);
-
- if (k != kh_end(priv->headers)) {
- ar = kh_val(priv->headers, k);
-
- hname = g_string_new(key);
- hvalue = g_string_new("");
-
- if (nhdr > 0) {
- if (ar->len >= nhdr) {
- rspamd_milter_send_action(session,
- RSPAMD_MILTER_CHGHEADER,
- nhdr, hname, hvalue);
- priv->cur_hdr--;
- }
- }
- else if (nhdr == 0) {
- /* We need to clear all headers */
- for (i = ar->len; i > 0; i--) {
- rspamd_milter_send_action(session,
- RSPAMD_MILTER_CHGHEADER,
- i, hname, hvalue);
- priv->cur_hdr--;
- }
- }
- else {
- /* Remove from the end */
- if (nhdr >= -(ar->len)) {
- rspamd_milter_send_action(session,
- RSPAMD_MILTER_CHGHEADER,
- ar->len + nhdr + 1, hname, hvalue);
- priv->cur_hdr--;
- }
- }
-
- g_string_free(hname, TRUE);
- g_string_free(hvalue, TRUE);
-
- if (priv->cur_hdr < 0) {
- msg_err_milter("negative header count after removing %s", key);
- priv->cur_hdr = 0;
- }
- }
- }
-
- static void
- rspamd_milter_extract_single_header(struct rspamd_milter_session *session,
- const char *hdr, const ucl_object_t *obj)
- {
- GString *hname, *hvalue;
- struct rspamd_milter_private *priv = session->priv;
- int idx = -1;
- const ucl_object_t *val;
-
- val = ucl_object_lookup(obj, "value");
-
- if (val && ucl_object_type(val) == UCL_STRING) {
- const ucl_object_t *idx_obj;
- gboolean has_idx = FALSE;
-
- idx_obj = ucl_object_lookup_any(obj, "order",
- "index", NULL);
-
- if (idx_obj && (ucl_object_type(idx_obj) == UCL_INT || ucl_object_type(idx_obj) == UCL_FLOAT)) {
- idx = ucl_object_toint(idx_obj);
- has_idx = TRUE;
- }
-
- hname = g_string_new(hdr);
- hvalue = g_string_new(ucl_object_tostring(val));
-
- if (has_idx) {
- if (idx >= 0) {
- rspamd_milter_send_action(session,
- RSPAMD_MILTER_INSHEADER,
- idx,
- hname, hvalue);
- }
- else {
- /* Calculate negative offset */
-
- if (idx == -1) {
- rspamd_milter_send_action(session,
- RSPAMD_MILTER_ADDHEADER,
- hname, hvalue);
- }
- else if (-idx <= priv->cur_hdr) {
- /*
- * Note: We should account MTA's own "Received:" field
- * which wasn't passed by Milter's header command.
- */
- rspamd_milter_send_action(session,
- RSPAMD_MILTER_INSHEADER,
- priv->cur_hdr + idx + 2,
- hname, hvalue);
- }
- else {
- rspamd_milter_send_action(session,
- RSPAMD_MILTER_INSHEADER,
- 0,
- hname, hvalue);
- }
- }
- }
- else {
- rspamd_milter_send_action(session,
- RSPAMD_MILTER_ADDHEADER,
- hname, hvalue);
- }
-
- priv->cur_hdr++;
-
- g_string_free(hname, TRUE);
- g_string_free(hvalue, TRUE);
- }
- }
-
- /*
- * Returns `TRUE` if action has been processed internally by this function
- */
- static gboolean
- rspamd_milter_process_milter_block(struct rspamd_milter_session *session,
- const ucl_object_t *obj, struct rspamd_action *action)
- {
- const ucl_object_t *elt, *cur;
- ucl_object_iter_t it;
- struct rspamd_milter_private *priv = session->priv;
- GString *hname, *hvalue;
-
- if (obj && ucl_object_type(obj) == UCL_OBJECT) {
- elt = ucl_object_lookup(obj, "remove_headers");
- /*
- * remove_headers: {"name": 1, ... }
- * where number is the header's position starting from '1'
- */
- if (elt && ucl_object_type(elt) == UCL_OBJECT) {
- it = NULL;
-
- while ((cur = ucl_object_iterate(elt, &it, true)) != NULL) {
- if (ucl_object_type(cur) == UCL_INT) {
- rspamd_milter_remove_header_safe(session,
- ucl_object_key(cur),
- ucl_object_toint(cur));
- }
- }
- }
-
- elt = ucl_object_lookup(obj, "add_headers");
- /*
- * add_headers: {"name": "value", ... }
- * name could have multiple values
- * -or- (since 1.7)
- * {"name": {"value": "val", "order": 0}, ... }
- */
- if (elt && ucl_object_type(elt) == UCL_OBJECT) {
- it = NULL;
-
- while ((cur = ucl_object_iterate(elt, &it, true)) != NULL) {
-
- const char *key_name = ucl_object_key(cur);
-
- if (ucl_object_type(cur) == UCL_STRING) {
- /*
- * Legacy support of {"name": "value", ... } with
- * multiple names under the same name
- */
- ucl_object_iter_t *elt_it;
- const ucl_object_t *cur_elt;
-
- elt_it = ucl_object_iterate_new(cur);
- while ((cur_elt = ucl_object_iterate_safe(elt_it, false)) != NULL) {
- if (ucl_object_type(cur_elt) == UCL_STRING) {
- hname = g_string_new(key_name);
- hvalue = g_string_new(ucl_object_tostring(cur_elt));
-
- rspamd_milter_send_action(session,
- RSPAMD_MILTER_ADDHEADER,
- hname, hvalue);
- g_string_free(hname, TRUE);
- g_string_free(hvalue, TRUE);
- }
- else {
- msg_warn_milter("legacy header with name %s, that has not a string value: %s",
- key_name, ucl_object_type_to_string(cur_elt->type));
- }
- }
- ucl_object_iterate_free(elt_it);
- }
- else {
- if (ucl_object_type(cur) == UCL_OBJECT) {
- rspamd_milter_extract_single_header(session,
- key_name, cur);
- }
- else if (ucl_object_type(cur) == UCL_ARRAY) {
- /* Multiple values for the same key */
- ucl_object_iter_t *array_it;
- const ucl_object_t *array_elt;
-
- array_it = ucl_object_iterate_new(cur);
-
- while ((array_elt = ucl_object_iterate_safe(array_it,
- true)) != NULL) {
- rspamd_milter_extract_single_header(session,
- key_name, array_elt);
- }
-
- ucl_object_iterate_free(array_it);
- }
- else {
- msg_warn_milter("non-legacy header with name %s, that has unsupported value type: %s",
- key_name, ucl_object_type_to_string(cur->type));
- }
- }
- }
- }
-
- elt = ucl_object_lookup(obj, "change_from");
-
- if (elt && ucl_object_type(elt) == UCL_STRING) {
- hvalue = g_string_new(ucl_object_tostring(elt));
- rspamd_milter_send_action(session,
- RSPAMD_MILTER_CHGFROM,
- hvalue);
- g_string_free(hvalue, TRUE);
- }
-
- elt = ucl_object_lookup(obj, "add_rcpt");
-
- if (elt && ucl_object_type(elt) == UCL_ARRAY) {
- it = NULL;
-
- while ((cur = ucl_object_iterate(elt, &it, true)) != NULL) {
- hvalue = g_string_new(ucl_object_tostring(cur));
- rspamd_milter_send_action(session,
- RSPAMD_MILTER_ADDRCPT,
- hvalue);
- g_string_free(hvalue, TRUE);
- }
- }
-
- elt = ucl_object_lookup(obj, "del_rcpt");
-
- if (elt && ucl_object_type(elt) == UCL_ARRAY) {
- it = NULL;
-
- while ((cur = ucl_object_iterate(elt, &it, true)) != NULL) {
- hvalue = g_string_new(ucl_object_tostring(cur));
- rspamd_milter_send_action(session,
- RSPAMD_MILTER_DELRCPT,
- hvalue);
- g_string_free(hvalue, TRUE);
- }
- }
-
- elt = ucl_object_lookup(obj, "reject");
-
- if (elt && ucl_object_type(elt) == UCL_STRING) {
- if (strcmp(ucl_object_tostring(elt), "discard") == 0) {
- priv->discard_on_reject = TRUE;
- msg_info_milter("discard message instead of rejection");
- }
- else if (strcmp(ucl_object_tostring(elt), "quarantine") == 0) {
- priv->quarantine_on_reject = TRUE;
- msg_info_milter("quarantine message instead of rejection");
- }
- else {
- priv->discard_on_reject = FALSE;
- priv->quarantine_on_reject = FALSE;
- }
- }
-
- elt = ucl_object_lookup(obj, "no_action");
-
- if (elt && ucl_object_type(elt) == UCL_BOOLEAN) {
- priv->no_action = ucl_object_toboolean(elt);
- }
- }
-
- if (action->action_type == METRIC_ACTION_ADD_HEADER) {
- elt = ucl_object_lookup(obj, "spam_header");
-
- if (elt) {
- if (ucl_object_type(elt) == UCL_STRING) {
- rspamd_milter_remove_header_safe(session,
- milter_ctx->spam_header,
- 0);
-
- hname = g_string_new(milter_ctx->spam_header);
- hvalue = g_string_new(ucl_object_tostring(elt));
- rspamd_milter_send_action(session, RSPAMD_MILTER_CHGHEADER,
- (uint32_t) 1, hname, hvalue);
- g_string_free(hname, TRUE);
- g_string_free(hvalue, TRUE);
- rspamd_milter_send_action(session, RSPAMD_MILTER_ACCEPT);
-
- return TRUE;
- }
- else if (ucl_object_type(elt) == UCL_OBJECT) {
- it = NULL;
-
- while ((cur = ucl_object_iterate(elt, &it, true)) != NULL) {
- rspamd_milter_remove_header_safe(session,
- ucl_object_key(cur),
- 0);
-
- hname = g_string_new(ucl_object_key(cur));
- hvalue = g_string_new(ucl_object_tostring(cur));
- rspamd_milter_send_action(session, RSPAMD_MILTER_CHGHEADER,
- (uint32_t) 1, hname, hvalue);
- g_string_free(hname, TRUE);
- g_string_free(hvalue, TRUE);
- }
-
- rspamd_milter_send_action(session, RSPAMD_MILTER_ACCEPT);
-
- return TRUE;
- }
- }
- }
-
- return FALSE;
- }
-
- void rspamd_milter_send_task_results(struct rspamd_milter_session *session,
- const ucl_object_t *results,
- const char *new_body,
- gsize bodylen)
- {
- const ucl_object_t *elt;
- struct rspamd_milter_private *priv = session->priv;
- const char *str_action;
- struct rspamd_action *action;
- rspamd_fstring_t *xcode = NULL, *rcode = NULL, *reply = NULL;
- GString *hname, *hvalue;
- gboolean processed = FALSE;
-
- if (results == NULL) {
- msg_err_milter("cannot find scan results, tempfail");
- rspamd_milter_send_action(session, RSPAMD_MILTER_TEMPFAIL);
-
- goto cleanup;
- }
-
- elt = ucl_object_lookup(results, "action");
-
- if (!elt) {
- msg_err_milter("cannot find action in results, tempfail");
- rspamd_milter_send_action(session, RSPAMD_MILTER_TEMPFAIL);
-
- goto cleanup;
- }
-
- str_action = ucl_object_tostring(elt);
- action = rspamd_config_get_action(milter_ctx->cfg, str_action);
-
- if (action == NULL) {
- msg_err_milter("action %s has not been registered", str_action);
- rspamd_milter_send_action(session, RSPAMD_MILTER_TEMPFAIL);
-
- goto cleanup;
- }
-
- elt = ucl_object_lookup(results, "messages");
- if (elt) {
- const ucl_object_t *smtp_res;
- const char *msg;
- gsize len = 0;
-
- smtp_res = ucl_object_lookup(elt, "smtp_message");
-
- if (smtp_res) {
- msg = ucl_object_tolstring(smtp_res, &len);
- reply = rspamd_fstring_new_init(msg, len);
- }
- }
-
- /* Deal with milter headers */
- elt = ucl_object_lookup(results, "milter");
-
- if (elt) {
- processed = rspamd_milter_process_milter_block(session, elt, action);
- }
-
- /* DKIM-Signature */
- elt = ucl_object_lookup(results, "dkim-signature");
-
- if (elt) {
- hname = g_string_new(RSPAMD_MILTER_DKIM_HEADER);
-
- if (ucl_object_type(elt) == UCL_STRING) {
- hvalue = g_string_new(ucl_object_tostring(elt));
-
- rspamd_milter_send_action(session, RSPAMD_MILTER_INSHEADER,
- 1, hname, hvalue);
-
- g_string_free(hvalue, TRUE);
- }
- else {
- ucl_object_iter_t it;
- const ucl_object_t *cur;
- int i = 1;
-
- it = ucl_object_iterate_new(elt);
-
- while ((cur = ucl_object_iterate_safe(it, true)) != NULL) {
- hvalue = g_string_new(ucl_object_tostring(cur));
-
- rspamd_milter_send_action(session, RSPAMD_MILTER_INSHEADER,
- i++, hname, hvalue);
-
- g_string_free(hvalue, TRUE);
- }
-
- ucl_object_iterate_free(it);
- }
-
- g_string_free(hname, TRUE);
- }
-
- if (processed) {
- goto cleanup;
- }
-
- if (new_body) {
- rspamd_milter_send_action(session, RSPAMD_MILTER_REPLBODY,
- bodylen, new_body);
- }
-
- if (priv->no_action) {
- msg_info_milter("do not apply action %s, no_action is set",
- str_action);
- hname = g_string_new(RSPAMD_MILTER_ACTION_HEADER);
- hvalue = g_string_new(str_action);
-
- rspamd_milter_send_action(session, RSPAMD_MILTER_ADDHEADER,
- hname, hvalue);
- g_string_free(hname, TRUE);
- g_string_free(hvalue, TRUE);
- rspamd_milter_send_action(session, RSPAMD_MILTER_ACCEPT);
-
- goto cleanup;
- }
-
- switch (action->action_type) {
- case METRIC_ACTION_REJECT:
- if (priv->discard_on_reject) {
- rspamd_milter_send_action(session, RSPAMD_MILTER_DISCARD);
- }
- else if (priv->quarantine_on_reject) {
- if (!reply) {
- if (milter_ctx->quarantine_message == NULL) {
- reply = rspamd_fstring_new_init(
- RSPAMD_MILTER_QUARANTINE_MESSAGE,
- sizeof(RSPAMD_MILTER_QUARANTINE_MESSAGE) - 1);
- }
- else {
- reply = rspamd_fstring_new_init(milter_ctx->quarantine_message,
- strlen(milter_ctx->quarantine_message));
- }
- rspamd_milter_send_action(session, RSPAMD_MILTER_QUARANTINE, reply);
- }
-
- /* Quarantine also requires accept action, all hail Sendmail */
- rspamd_milter_send_action(session, RSPAMD_MILTER_ACCEPT);
- }
- else {
- rcode = rspamd_fstring_new_init(RSPAMD_MILTER_RCODE_REJECT,
- sizeof(RSPAMD_MILTER_RCODE_REJECT) - 1);
- xcode = rspamd_fstring_new_init(RSPAMD_MILTER_XCODE_REJECT,
- sizeof(RSPAMD_MILTER_XCODE_REJECT) - 1);
-
- if (!reply) {
- if (milter_ctx->reject_message == NULL) {
- reply = rspamd_fstring_new_init(
- RSPAMD_MILTER_REJECT_MESSAGE,
- sizeof(RSPAMD_MILTER_REJECT_MESSAGE) - 1);
- }
- else {
- reply = rspamd_fstring_new_init(milter_ctx->reject_message,
- strlen(milter_ctx->reject_message));
- }
- }
-
- rspamd_milter_set_reply(session, rcode, xcode, reply);
- }
- break;
- case METRIC_ACTION_SOFT_REJECT:
- rcode = rspamd_fstring_new_init(RSPAMD_MILTER_RCODE_TEMPFAIL,
- sizeof(RSPAMD_MILTER_RCODE_TEMPFAIL) - 1);
- xcode = rspamd_fstring_new_init(RSPAMD_MILTER_XCODE_TEMPFAIL,
- sizeof(RSPAMD_MILTER_XCODE_TEMPFAIL) - 1);
-
- if (!reply) {
- if (milter_ctx->tempfail_message == NULL) {
- reply = rspamd_fstring_new_init(
- RSPAMD_MILTER_TEMPFAIL_MESSAGE,
- sizeof(RSPAMD_MILTER_TEMPFAIL_MESSAGE) - 1);
- }
- else {
- reply = rspamd_fstring_new_init(milter_ctx->tempfail_message,
- strlen(milter_ctx->tempfail_message));
- }
- }
-
- rspamd_milter_set_reply(session, rcode, xcode, reply);
- break;
-
- case METRIC_ACTION_REWRITE_SUBJECT:
- elt = ucl_object_lookup(results, "subject");
-
- if (elt) {
- hname = g_string_new("Subject");
- hvalue = g_string_new(ucl_object_tostring(elt));
-
- rspamd_milter_send_action(session, RSPAMD_MILTER_CHGHEADER,
- (uint32_t) 1, hname, hvalue);
- g_string_free(hname, TRUE);
- g_string_free(hvalue, TRUE);
- }
-
- rspamd_milter_send_action(session, RSPAMD_MILTER_ACCEPT);
- break;
-
- case METRIC_ACTION_ADD_HEADER:
- /* Remove existing headers */
- rspamd_milter_remove_header_safe(session,
- milter_ctx->spam_header,
- 0);
-
- hname = g_string_new(milter_ctx->spam_header);
- hvalue = g_string_new("Yes");
- rspamd_milter_send_action(session, RSPAMD_MILTER_CHGHEADER,
- (uint32_t) 1, hname, hvalue);
- g_string_free(hname, TRUE);
- g_string_free(hvalue, TRUE);
- rspamd_milter_send_action(session, RSPAMD_MILTER_ACCEPT);
- break;
-
- case METRIC_ACTION_QUARANTINE:
- if (!reply) {
- if (milter_ctx->quarantine_message == NULL) {
- reply = rspamd_fstring_new_init(
- RSPAMD_MILTER_QUARANTINE_MESSAGE,
- sizeof(RSPAMD_MILTER_QUARANTINE_MESSAGE) - 1);
- }
- else {
- reply = rspamd_fstring_new_init(milter_ctx->quarantine_message,
- strlen(milter_ctx->quarantine_message));
- }
- rspamd_milter_send_action(session, RSPAMD_MILTER_QUARANTINE, reply);
- }
-
- /* Quarantine also requires accept action, all hail Sendmail */
- rspamd_milter_send_action(session, RSPAMD_MILTER_ACCEPT);
- break;
- case METRIC_ACTION_DISCARD:
- rspamd_milter_send_action(session, RSPAMD_MILTER_DISCARD);
- break;
- case METRIC_ACTION_GREYLIST:
- case METRIC_ACTION_NOACTION:
- default:
- rspamd_milter_send_action(session, RSPAMD_MILTER_ACCEPT);
- break;
- }
-
- cleanup:
- rspamd_fstring_free(rcode);
- rspamd_fstring_free(xcode);
- rspamd_fstring_free(reply);
-
- rspamd_milter_session_reset(session, RSPAMD_MILTER_RESET_ABORT);
- }
-
- void rspamd_milter_init_library(const struct rspamd_milter_context *ctx)
- {
- milter_ctx = ctx;
- }
-
- rspamd_mempool_t *
- rspamd_milter_get_session_pool(struct rspamd_milter_session *session)
- {
- struct rspamd_milter_private *priv = session->priv;
-
- return priv->pool;
- }
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