1 /******************************************************************************/
2 /* pfixtools: a collection of postfix related tools */
4 /* ________________________________________________________________________ */
6 /* Redistribution and use in source and binary forms, with or without */
7 /* modification, are permitted provided that the following conditions */
10 /* 1. Redistributions of source code must retain the above copyright */
11 /* notice, this list of conditions and the following disclaimer. */
12 /* 2. Redistributions in binary form must reproduce the above copyright */
13 /* notice, this list of conditions and the following disclaimer in the */
14 /* documentation and/or other materials provided with the distribution. */
15 /* 3. The names of its contributors may not be used to endorse or promote */
16 /* products derived from this software without specific prior written */
19 /* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND */
20 /* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE */
21 /* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
22 /* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS */
23 /* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR */
24 /* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF */
25 /* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS */
26 /* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */
27 /* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) */
28 /* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF */
29 /* THE POSSIBILITY OF SUCH DAMAGE. */
30 /******************************************************************************/
33 * Copyright © 2006-2007 Pierre Habouzit
43 #define DAEMON_NAME "postlicyd"
44 #define DEFAULT_PORT 10000
45 #define RUNAS_USER "nobody"
46 #define RUNAS_GROUP "nogroup"
52 SMTP_HELO = SMTP_EHLO,
61 /* \see http://www.postfix.org/SMTPD_POLICY_README.html */
62 typedef struct query_t {
66 const char *helo_name;
69 const char *recipient;
70 const char *recipient_count;
71 const char *client_address;
72 const char *client_name;
73 const char *reverse_client_name;
77 const char *sasl_method;
78 const char *sasl_username;
79 const char *sasl_sender;
81 const char *ccert_subject;
82 const char *ccert_issuer;
83 const char *ccsert_fingerprint;
86 const char *encryption_protocol;
87 const char *encryption_cipher;
88 const char *encryption_keysize;
89 const char *etrn_domain;
94 typedef struct plicyd_t {
95 unsigned listener : 1;
103 static plicyd_t *plicyd_new(void)
105 plicyd_t *plicyd = p_new(plicyd_t, 1);
110 static void plicyd_delete(plicyd_t **plicyd)
113 if ((*plicyd)->fd >= 0)
114 close((*plicyd)->fd);
115 buffer_wipe(&(*plicyd)->ibuf);
116 buffer_wipe(&(*plicyd)->obuf);
121 static int postfix_parsejob(query_t *query, char *p)
123 #define PARSE_CHECK(expr, error, ...) \
126 syslog(LOG_ERR, error, ##__VA_ARGS__); \
138 p = strchr(k = p, '=');
139 PARSE_CHECK(p, "could not find '=' in line");
140 for (klen = p - k; klen && isblank(k[klen]); klen--);
145 p = strchr(v = p, '\n');
146 PARSE_CHECK(p, "could not find final \\n in line");
147 for (vlen = p - v; vlen && isblank(v[vlen]); vlen--);
148 p += 1; /* skip \n */
150 vtk = tokenize(v, vlen);
151 switch (tokenize(k, klen)) {
152 #define CASE(up, low) case PTK_##up: query->low = v; v[vlen] = '\0'; break;
153 CASE(HELO_NAME, helo_name);
154 CASE(QUEUE_ID, queue_id);
155 CASE(SENDER, sender);
156 CASE(RECIPIENT, recipient);
157 CASE(RECIPIENT_COUNT, recipient_count);
158 CASE(CLIENT_ADDRESS, client_address);
159 CASE(CLIENT_NAME, client_name);
160 CASE(REVERSE_CLIENT_NAME, reverse_client_name);
161 CASE(INSTANCE, instance);
162 CASE(SASL_METHOD, sasl_method);
163 CASE(SASL_USERNAME, sasl_username);
164 CASE(SASL_SENDER, sasl_sender);
166 CASE(CCERT_SUBJECT, ccert_subject);
167 CASE(CCERT_ISSUER, ccert_issuer);
168 CASE(CCSERT_FINGERPRINT, ccsert_fingerprint);
169 CASE(ENCRYPTION_PROTOCOL, encryption_protocol);
170 CASE(ENCRYPTION_CIPHER, encryption_cipher);
171 CASE(ENCRYPTION_KEYSIZE, encryption_keysize);
172 CASE(ETRN_DOMAIN, etrn_domain);
176 PARSE_CHECK(vtk == PTK_SMTPD_ACCESS_POLICY,
177 "unexpected `request' value: %.*s", vlen, v);
180 case PTK_PROTOCOL_NAME:
181 PARSE_CHECK(vtk == PTK_SMTP || vtk == PTK_ESMTP,
182 "unexpected `protocol_name' value: %.*s", vlen, v);
183 query->esmtp = vtk == PTK_ESMTP;
186 case PTK_PROTOCOL_STATE:
188 #define CASE(name) case PTK_##name: query->state = SMTP_##name; break;
195 CASE(END_OF_MESSAGE);
199 PARSE_CHECK(false, "unexpected `protocol_state` value: %.*s",
206 syslog(LOG_WARNING, "unexpected key, skipped: %.*s", klen, k);
211 return query->state == SMTP_UNKNOWN ? -1 : 0;
215 __attribute__((format(printf,2,0)))
216 static void policy_answer(plicyd_t *pcy, const char *fmt, ...)
220 buffer_addvf(&pcy->obuf, fmt, args);
222 buffer_addstr(&pcy->obuf, "\n\n");
223 buffer_consume(&pcy->ibuf, pcy->q.eoq - pcy->ibuf.data);
224 epoll_modify(pcy->fd, EPOLLIN | EPOLLOUT, pcy);
227 static void policy_process(plicyd_t *pcy)
229 policy_answer(pcy, "DUNNO");
232 static int policy_run(plicyd_t *pcy)
234 ssize_t search_offs = MAX(0, pcy->ibuf.len - 1);
235 int nb = buffer_read(&pcy->ibuf, pcy->fd, -1);
239 if (errno == EAGAIN || errno == EINTR)
246 syslog(LOG_ERR, "unexpected end of data");
250 if (!(eoq = strstr(pcy->ibuf.data + search_offs, "\n\n")))
253 if (postfix_parsejob(&pcy->q, pcy->ibuf.data) < 0)
255 pcy->q.eoq = eoq + strlen("\n\n");
256 epoll_modify(pcy->fd, 0, pcy);
261 int start_listener(int port)
263 struct sockaddr_in addr = {
264 .sin_family = AF_INET,
265 .sin_addr = { htonl(INADDR_LOOPBACK) },
270 addr.sin_port = htons(port);
271 sock = tcp_listen_nonblock((const struct sockaddr *)&addr, sizeof(addr));
278 tmp->listener = true;
279 epoll_register(sock, EPOLLIN, tmp);
283 void start_client(plicyd_t *d)
288 sock = accept_nonblock(d->fd);
296 epoll_register(sock, EPOLLIN, tmp);
299 /* administrivia {{{ */
301 static int main_initialize(void)
303 openlog("postlicyd", LOG_PID, LOG_MAIL);
304 signal(SIGPIPE, SIG_IGN);
305 signal(SIGINT, &common_sighandler);
306 signal(SIGTERM, &common_sighandler);
307 signal(SIGHUP, &common_sighandler);
308 signal(SIGSEGV, &common_sighandler);
309 syslog(LOG_INFO, "Starting...");
313 static void main_shutdown(void)
318 module_init(main_initialize);
319 module_exit(main_shutdown);
323 fputs("usage: "DAEMON_NAME" [options] config\n"
326 " -l <port> port to listen to\n"
327 " -p <pidfile> file to write our pid to\n"
328 " -f stay in foreground\n"
334 int main(int argc, char *argv[])
336 const char *pidfile = NULL;
337 bool daemonize = true;
338 int port = DEFAULT_PORT;
340 for (int c = 0; (c = getopt(argc, argv, "hf" "l:p:")) >= 0; ) {
357 if (argc - optind != 1) {
362 if (pidfile_open(pidfile) < 0) {
363 syslog(LOG_CRIT, "unable to write pidfile %s", pidfile);
367 if (drop_privileges(RUNAS_USER, RUNAS_GROUP) < 0) {
368 syslog(LOG_CRIT, "unable to drop privileges");
372 if (daemonize && daemon_detach() < 0) {
373 syslog(LOG_CRIT, "unable to fork");
379 if (start_listener(port) < 0)
383 struct epoll_event evts[1024];
386 n = epoll_select(evts, countof(evts), -1);
388 if (errno != EAGAIN && errno != EINTR) {
389 UNIXERR("epoll_wait");
396 plicyd_t *d = evts[n].data.ptr;
403 if (evts[n].events & EPOLLIN) {
404 if (policy_run(d) < 0) {
410 if ((evts[n].events & EPOLLOUT) && d->obuf.len) {
411 if (buffer_write(&d->obuf, d->fd) < 0) {
416 epoll_modify(d->fd, EPOLLIN, d);
422 syslog(LOG_INFO, "Stopping...");