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;
92 static int postfix_parsejob(query_t *query, char *p)
94 #define PARSE_CHECK(expr, error, ...) \
97 syslog(LOG_ERR, error, ##__VA_ARGS__); \
109 p = strchr(k = p, '=');
110 PARSE_CHECK(p, "could not find '=' in line");
111 for (klen = p - k; klen && isblank(k[klen]); klen--);
116 p = strchr(v = p, '\n');
117 PARSE_CHECK(p, "could not find final \\n in line");
118 for (vlen = p - v; vlen && isblank(v[vlen]); vlen--);
119 p += 1; /* skip \n */
121 vtk = tokenize(v, vlen);
122 switch (tokenize(k, klen)) {
123 #define CASE(up, low) case PTK_##up: query->low = v; v[vlen] = '\0'; break;
124 CASE(HELO_NAME, helo_name);
125 CASE(QUEUE_ID, queue_id);
126 CASE(SENDER, sender);
127 CASE(RECIPIENT, recipient);
128 CASE(RECIPIENT_COUNT, recipient_count);
129 CASE(CLIENT_ADDRESS, client_address);
130 CASE(CLIENT_NAME, client_name);
131 CASE(REVERSE_CLIENT_NAME, reverse_client_name);
132 CASE(INSTANCE, instance);
133 CASE(SASL_METHOD, sasl_method);
134 CASE(SASL_USERNAME, sasl_username);
135 CASE(SASL_SENDER, sasl_sender);
137 CASE(CCERT_SUBJECT, ccert_subject);
138 CASE(CCERT_ISSUER, ccert_issuer);
139 CASE(CCSERT_FINGERPRINT, ccsert_fingerprint);
140 CASE(ENCRYPTION_PROTOCOL, encryption_protocol);
141 CASE(ENCRYPTION_CIPHER, encryption_cipher);
142 CASE(ENCRYPTION_KEYSIZE, encryption_keysize);
143 CASE(ETRN_DOMAIN, etrn_domain);
147 PARSE_CHECK(vtk == PTK_SMTPD_ACCESS_POLICY,
148 "unexpected `request' value: %.*s", vlen, v);
151 case PTK_PROTOCOL_NAME:
152 PARSE_CHECK(vtk == PTK_SMTP || vtk == PTK_ESMTP,
153 "unexpected `protocol_name' value: %.*s", vlen, v);
154 query->esmtp = vtk == PTK_ESMTP;
157 case PTK_PROTOCOL_STATE:
159 #define CASE(name) case PTK_##name: query->state = SMTP_##name; break;
166 CASE(END_OF_MESSAGE);
170 PARSE_CHECK(false, "unexpected `protocol_state` value: %.*s",
177 syslog(LOG_WARNING, "unexpected key, skipped: %.*s", klen, k);
182 return query->state == SMTP_UNKNOWN ? -1 : 0;
186 static void *policy_run(int fd, void *data)
192 ssize_t search_offs = MAX(0, buf.len - 1);
193 int nb = buffer_read(&buf, fd, -1);
198 if (errno == EAGAIN || errno == EINTR)
205 syslog(LOG_ERR, "unexpected end of data");
209 eoq = strstr(buf.data + search_offs, "\n\n");
213 if (postfix_parsejob(&q, buf.data) < 0)
216 buffer_consume(&buf, eoq + strlen("\n\n") - buf.data);
217 if (xwrite(fd, "DUNNO\n\n", strlen("DUNNO\n\n"))) {
228 /* administrivia {{{ */
230 static int main_initialize(void)
234 openlog("postlicyd", LOG_PID, LOG_MAIL);
235 signal(SIGPIPE, SIG_IGN);
236 sigaction(SIGINT, NULL, &sa);
237 sa.sa_handler = &common_sighandler;
238 sa.sa_flags &= ~SA_RESTART;
239 sigaction(SIGINT, &sa, NULL);
240 signal(SIGTERM, &common_sighandler);
241 signal(SIGHUP, &common_sighandler);
242 signal(SIGSEGV, &common_sighandler);
243 syslog(LOG_INFO, "Starting...");
247 static void main_shutdown(void)
252 module_init(main_initialize);
253 module_exit(main_shutdown);
257 fputs("usage: "DAEMON_NAME" [options] config\n"
260 " -l <port> port to listen to\n"
261 " -p <pidfile> file to write our pid to\n"
262 " -f stay in foreground\n"
268 int main(int argc, char *argv[])
270 struct sockaddr_in addr = {
271 .sin_family = AF_INET,
272 .sin_addr = { htonl(INADDR_LOOPBACK) },
274 const char *pidfile = NULL;
275 bool daemonize = true;
276 int port = DEFAULT_PORT;
279 for (int c = 0; (c = getopt(argc, argv, "hf" "l:p:")) >= 0; ) {
296 if (argc - optind != 1) {
301 if (pidfile_open(pidfile) < 0) {
302 syslog(LOG_CRIT, "unable to write pidfile %s", pidfile);
306 if (drop_privileges(RUNAS_USER, RUNAS_GROUP) < 0) {
307 syslog(LOG_CRIT, "unable to drop privileges");
311 if (daemonize && daemon_detach() < 0) {
312 syslog(LOG_CRIT, "unable to fork");
318 addr.sin_port = htons(port);
319 sock = tcp_listen((struct sockaddr *)&addr, sizeof(addr));
324 int fd = accept(sock, NULL, 0);
326 if (errno != EINTR && errno != EAGAIN)
330 thread_launch(policy_run, fd, NULL);
335 syslog(LOG_INFO, "Stopping...");