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
44 #define DAEMON_NAME "postlicyd"
45 #define DEFAULT_PORT 10000
46 #define RUNAS_USER "nobody"
47 #define RUNAS_GROUP "nogroup"
53 SMTP_HELO = SMTP_EHLO,
62 /* \see http://www.postfix.org/SMTPD_POLICY_README.html */
63 typedef struct query_t {
67 const char *helo_name;
70 const char *recipient;
71 const char *recipient_count;
72 const char *client_address;
73 const char *client_name;
74 const char *reverse_client_name;
78 const char *sasl_method;
79 const char *sasl_username;
80 const char *sasl_sender;
82 const char *ccert_subject;
83 const char *ccert_issuer;
84 const char *ccsert_fingerprint;
87 const char *encryption_protocol;
88 const char *encryption_cipher;
89 const char *encryption_keysize;
90 const char *etrn_domain;
95 static void* query_new()
97 return p_new(query_t, 1);
100 static void query_delete(void *arg)
102 query_t **query = arg;
108 static int postfix_parsejob(query_t *query, char *p)
110 #define PARSE_CHECK(expr, error, ...) \
113 syslog(LOG_ERR, error, ##__VA_ARGS__); \
125 p = strchr(k = p, '=');
126 PARSE_CHECK(p, "could not find '=' in line");
127 for (klen = p - k; klen && isblank(k[klen]); klen--);
132 p = strchr(v = p, '\n');
133 PARSE_CHECK(p, "could not find final \\n in line");
134 for (vlen = p - v; vlen && isblank(v[vlen]); vlen--);
135 p += 1; /* skip \n */
137 vtk = tokenize(v, vlen);
138 switch (tokenize(k, klen)) {
139 #define CASE(up, low) case PTK_##up: query->low = v; v[vlen] = '\0'; break;
140 CASE(HELO_NAME, helo_name);
141 CASE(QUEUE_ID, queue_id);
142 CASE(SENDER, sender);
143 CASE(RECIPIENT, recipient);
144 CASE(RECIPIENT_COUNT, recipient_count);
145 CASE(CLIENT_ADDRESS, client_address);
146 CASE(CLIENT_NAME, client_name);
147 CASE(REVERSE_CLIENT_NAME, reverse_client_name);
148 CASE(INSTANCE, instance);
149 CASE(SASL_METHOD, sasl_method);
150 CASE(SASL_USERNAME, sasl_username);
151 CASE(SASL_SENDER, sasl_sender);
153 CASE(CCERT_SUBJECT, ccert_subject);
154 CASE(CCERT_ISSUER, ccert_issuer);
155 CASE(CCSERT_FINGERPRINT, ccsert_fingerprint);
156 CASE(ENCRYPTION_PROTOCOL, encryption_protocol);
157 CASE(ENCRYPTION_CIPHER, encryption_cipher);
158 CASE(ENCRYPTION_KEYSIZE, encryption_keysize);
159 CASE(ETRN_DOMAIN, etrn_domain);
163 PARSE_CHECK(vtk == PTK_SMTPD_ACCESS_POLICY,
164 "unexpected `request' value: %.*s", vlen, v);
167 case PTK_PROTOCOL_NAME:
168 PARSE_CHECK(vtk == PTK_SMTP || vtk == PTK_ESMTP,
169 "unexpected `protocol_name' value: %.*s", vlen, v);
170 query->esmtp = vtk == PTK_ESMTP;
173 case PTK_PROTOCOL_STATE:
175 #define CASE(name) case PTK_##name: query->state = SMTP_##name; break;
182 CASE(END_OF_MESSAGE);
186 PARSE_CHECK(false, "unexpected `protocol_state` value: %.*s",
193 syslog(LOG_WARNING, "unexpected key, skipped: %.*s", klen, k);
198 return query->state == SMTP_UNKNOWN ? -1 : 0;
202 __attribute__((format(printf,2,0)))
203 static void policy_answer(server_t *pcy, const char *fmt, ...)
207 buffer_addvf(&pcy->obuf, fmt, args);
209 buffer_addstr(&pcy->obuf, "\n\n");
210 buffer_consume(&pcy->ibuf, ((query_t*)(pcy->data))->eoq - pcy->ibuf.data);
211 epoll_modify(pcy->fd, EPOLLIN | EPOLLOUT, pcy);
214 static void policy_process(server_t *pcy)
216 policy_answer(pcy, "DUNNO");
219 static int policy_run(server_t *pcy, void* config)
221 ssize_t search_offs = MAX(0, pcy->ibuf.len - 1);
222 int nb = buffer_read(&pcy->ibuf, pcy->fd, -1);
226 if (errno == EAGAIN || errno == EINTR)
233 syslog(LOG_ERR, "unexpected end of data");
237 if (!(eoq = strstr(pcy->ibuf.data + search_offs, "\n\n")))
240 if (postfix_parsejob(pcy->data, pcy->ibuf.data) < 0)
242 ((query_t*)pcy->data)->eoq = eoq + strlen("\n\n");
243 epoll_modify(pcy->fd, 0, pcy);
248 int start_listener(int port)
250 return start_server(port, NULL, NULL);
253 /* administrivia {{{ */
255 static int main_initialize(void)
257 openlog("postlicyd", LOG_PID, LOG_MAIL);
258 signal(SIGPIPE, SIG_IGN);
259 signal(SIGINT, &common_sighandler);
260 signal(SIGTERM, &common_sighandler);
261 signal(SIGHUP, &common_sighandler);
262 signal(SIGSEGV, &common_sighandler);
263 syslog(LOG_INFO, "Starting...");
267 static void main_shutdown(void)
272 module_init(main_initialize);
273 module_exit(main_shutdown);
277 fputs("usage: "DAEMON_NAME" [options] config\n"
280 " -l <port> port to listen to\n"
281 " -p <pidfile> file to write our pid to\n"
282 " -f stay in foreground\n"
288 int main(int argc, char *argv[])
290 const char *pidfile = NULL;
291 bool daemonize = true;
292 int port = DEFAULT_PORT;
294 for (int c = 0; (c = getopt(argc, argv, "hf" "l:p:")) >= 0; ) {
311 if (argc - optind != 1) {
316 if (pidfile_open(pidfile) < 0) {
317 syslog(LOG_CRIT, "unable to write pidfile %s", pidfile);
321 if (drop_privileges(RUNAS_USER, RUNAS_GROUP) < 0) {
322 syslog(LOG_CRIT, "unable to drop privileges");
326 if (daemonize && daemon_detach() < 0) {
327 syslog(LOG_CRIT, "unable to fork");
333 if (start_listener(port) < 0)
336 (void)server_loop(query_new, query_delete, policy_run, NULL);
338 syslog(LOG_INFO, "Stopping...");