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 query_t *query_new()
97 return p_new(query_t, 1);
100 static void query_delete(query_t **query)
107 static int postfix_parsejob(query_t *query, char *p)
109 #define PARSE_CHECK(expr, error, ...) \
112 syslog(LOG_ERR, error, ##__VA_ARGS__); \
124 p = strchr(k = p, '=');
125 PARSE_CHECK(p, "could not find '=' in line");
126 for (klen = p - k; klen && isblank(k[klen]); klen--);
131 p = strchr(v = p, '\n');
132 PARSE_CHECK(p, "could not find final \\n in line");
133 for (vlen = p - v; vlen && isblank(v[vlen]); vlen--);
134 p += 1; /* skip \n */
136 vtk = tokenize(v, vlen);
137 switch (tokenize(k, klen)) {
138 #define CASE(up, low) case PTK_##up: query->low = v; v[vlen] = '\0'; break;
139 CASE(HELO_NAME, helo_name);
140 CASE(QUEUE_ID, queue_id);
141 CASE(SENDER, sender);
142 CASE(RECIPIENT, recipient);
143 CASE(RECIPIENT_COUNT, recipient_count);
144 CASE(CLIENT_ADDRESS, client_address);
145 CASE(CLIENT_NAME, client_name);
146 CASE(REVERSE_CLIENT_NAME, reverse_client_name);
147 CASE(INSTANCE, instance);
148 CASE(SASL_METHOD, sasl_method);
149 CASE(SASL_USERNAME, sasl_username);
150 CASE(SASL_SENDER, sasl_sender);
152 CASE(CCERT_SUBJECT, ccert_subject);
153 CASE(CCERT_ISSUER, ccert_issuer);
154 CASE(CCSERT_FINGERPRINT, ccsert_fingerprint);
155 CASE(ENCRYPTION_PROTOCOL, encryption_protocol);
156 CASE(ENCRYPTION_CIPHER, encryption_cipher);
157 CASE(ENCRYPTION_KEYSIZE, encryption_keysize);
158 CASE(ETRN_DOMAIN, etrn_domain);
162 PARSE_CHECK(vtk == PTK_SMTPD_ACCESS_POLICY,
163 "unexpected `request' value: %.*s", vlen, v);
166 case PTK_PROTOCOL_NAME:
167 PARSE_CHECK(vtk == PTK_SMTP || vtk == PTK_ESMTP,
168 "unexpected `protocol_name' value: %.*s", vlen, v);
169 query->esmtp = vtk == PTK_ESMTP;
172 case PTK_PROTOCOL_STATE:
174 #define CASE(name) case PTK_##name: query->state = SMTP_##name; break;
181 CASE(END_OF_MESSAGE);
185 PARSE_CHECK(false, "unexpected `protocol_state` value: %.*s",
192 syslog(LOG_WARNING, "unexpected key, skipped: %.*s", klen, k);
197 return query->state == SMTP_UNKNOWN ? -1 : 0;
201 __attribute__((format(printf,2,0)))
202 static void policy_answer(server_t *pcy, const char *fmt, ...)
206 buffer_addvf(&pcy->obuf, fmt, args);
208 buffer_addstr(&pcy->obuf, "\n\n");
209 buffer_consume(&pcy->ibuf, ((query_t*)(pcy->data))->eoq - pcy->ibuf.data);
210 epoll_modify(pcy->fd, EPOLLIN | EPOLLOUT, pcy);
213 static void policy_process(server_t *pcy)
215 policy_answer(pcy, "DUNNO");
218 static int policy_run(server_t *pcy, void* config)
220 ssize_t search_offs = MAX(0, pcy->ibuf.len - 1);
221 int nb = buffer_read(&pcy->ibuf, pcy->fd, -1);
225 if (errno == EAGAIN || errno == EINTR)
232 syslog(LOG_ERR, "unexpected end of data");
236 if (!(eoq = strstr(pcy->ibuf.data + search_offs, "\n\n")))
239 if (postfix_parsejob(pcy->data, pcy->ibuf.data) < 0)
241 ((query_t*)pcy->data)->eoq = eoq + strlen("\n\n");
242 epoll_modify(pcy->fd, 0, pcy);
247 int start_listener(int port)
249 return start_server(port, NULL, NULL);
252 /* administrivia {{{ */
254 static int main_initialize(void)
256 openlog("postlicyd", LOG_PID, LOG_MAIL);
257 signal(SIGPIPE, SIG_IGN);
258 signal(SIGINT, &common_sighandler);
259 signal(SIGTERM, &common_sighandler);
260 signal(SIGHUP, &common_sighandler);
261 signal(SIGSEGV, &common_sighandler);
262 syslog(LOG_INFO, "Starting...");
266 static void main_shutdown(void)
271 module_init(main_initialize);
272 module_exit(main_shutdown);
276 fputs("usage: "DAEMON_NAME" [options] config\n"
279 " -l <port> port to listen to\n"
280 " -p <pidfile> file to write our pid to\n"
281 " -f stay in foreground\n"
287 int main(int argc, char *argv[])
289 const char *pidfile = NULL;
290 bool daemonize = true;
291 int port = DEFAULT_PORT;
293 for (int c = 0; (c = getopt(argc, argv, "hf" "l:p:")) >= 0; ) {
310 if (argc - optind != 1) {
315 if (pidfile_open(pidfile) < 0) {
316 syslog(LOG_CRIT, "unable to write pidfile %s", pidfile);
320 if (drop_privileges(RUNAS_USER, RUNAS_GROUP) < 0) {
321 syslog(LOG_CRIT, "unable to drop privileges");
325 if (daemonize && daemon_detach() < 0) {
326 syslog(LOG_CRIT, "unable to fork");
332 if (start_listener(port) < 0)
335 (void)server_loop((start_client_t)query_new, (delete_client_t)query_delete,
338 syslog(LOG_INFO, "Stopping...");