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"
49 SMTP_HELO = SMTP_EHLO,
58 /* \see http://www.postfix.org/SMTPD_POLICY_README.html */
59 typedef struct query_t {
63 const char *helo_name;
66 const char *recipient;
67 const char *recipient_count;
68 const char *client_address;
69 const char *client_name;
70 const char *rclient_name;
74 const char *sasl_method;
75 const char *sasl_username;
76 const char *sasl_sender;
78 const char *ccert_subject;
79 const char *ccert_issuer;
80 const char *ccsert_fingerprint;
83 const char *encryption_protocol;
84 const char *encryption_cipher;
85 const char *encryption_keysize;
86 const char *etrn_domain;
91 static query_t *query_init(query_t *rq) {
92 memset(rq, 0, offsetof(query_t, data));
93 buffer_init(&rq->data);
96 static void query_wipe(query_t *rq) {
97 buffer_wipe(&rq->data);
100 static int postfix_parsejob(query_t *query)
102 #define PARSE_CHECK(expr, error, ...) \
105 syslog(LOG_ERR, error, ##__VA_ARGS__); \
110 char *p = vskipspaces(query->data.data);
112 memset(query, 0, offsetof(query_t, data));
113 while (p[0] != '\r' || p[1] != '\n') {
119 p = strchr(k = p, '=');
120 PARSE_CHECK(p, "could not find '=' in line");
121 for (klen = p - k; klen && isblank(k[klen]); klen--);
126 p = strstr(v = p, "\r\n");
127 PARSE_CHECK(p, "could not find final \\r\\n in line");
128 for (vlen = p - v; vlen && isblank(v[vlen]); vlen--);
129 p += 2; /* skip \r\n */
131 vtk = tokenize(v, vlen);
132 switch (tokenize(k, klen)) {
133 #define CASE(up, low) case PTK_##up: query->low = v; v[vlen] = '\0'; break;
134 CASE(HELO_NAME, helo_name);
135 CASE(QUEUE_ID, queue_id);
136 CASE(SENDER, sender);
137 CASE(RECIPIENT, recipient);
138 CASE(RECIPIENT_COUNT, recipient_count);
139 CASE(CLIENT_ADDRESS, client_address);
140 CASE(CLIENT_NAME, client_name);
141 CASE(RCLIENT_NAME, rclient_name);
142 CASE(INSTANCE, instance);
143 CASE(SASL_METHOD, sasl_method);
144 CASE(SASL_USERNAME, sasl_username);
145 CASE(SASL_SENDER, sasl_sender);
147 CASE(CCERT_SUBJECT, ccert_subject);
148 CASE(CCERT_ISSUER, ccert_issuer);
149 CASE(CCSERT_FINGERPRINT, ccsert_fingerprint);
150 CASE(ENCRYPTION_PROTOCOL, encryption_protocol);
151 CASE(ENCRYPTION_CIPHER, encryption_cipher);
152 CASE(ENCRYPTION_KEYSIZE, encryption_keysize);
153 CASE(ETRN_DOMAIN, etrn_domain);
157 PARSE_CHECK(vtk == PTK_SMTPD_ACCESS_POLICY,
158 "unexpected `request' value: %.*s", vlen, v);
161 case PTK_PROTOCOL_NAME:
162 PARSE_CHECK(vtk == PTK_SMTP || vtk == PTK_ESMTP,
163 "unexpected `protocol_name' value: %.*s", vlen, v);
164 query->esmtp = vtk == PTK_ESMTP;
167 case PTK_PROTOCOL_STATE:
169 #define CASE(name) case PTK_##name: query->state = SMTP_##name; break;
176 CASE(END_OF_MESSAGE);
180 PARSE_CHECK(false, "unexpected `protocol_state` value: %.*s",
187 syslog(LOG_WARNING, "unexpected key, skipped: %.*s", klen, k);
192 return query->state == SMTP_UNKNOWN ? -1 : 0;
196 static void *policy_run(int fd, void *data)
202 int nb = buffer_read(&q.data, fd, -1);
206 if (errno == EAGAIN || errno == EINTR)
213 syslog(LOG_ERR, "unexpected end of data");
217 eoq = strstr(q.data.data + MAX(0, q.data.len - 3), "\r\n\r\n");
221 if (postfix_parsejob(&q) < 0)
224 buffer_consume(&q.data, eoq + strlen("\r\n\r\n") - q.data.data);
225 if (xwrite(fd, "DUNNO\r\n", strlen("DUNNO\r\n"))) {
236 static int main_loop(void)
238 int exitcode = EXIT_SUCCESS;
242 int fd = accept(sock, NULL, 0);
244 if (errno != EINTR || errno != EAGAIN)
249 thread_launch(policy_run, fd, NULL);
257 /* administrivia {{{ */
259 static int main_initialize(void)
261 openlog("postlicyd", LOG_PID, LOG_MAIL);
262 signal(SIGPIPE, SIG_IGN);
263 signal(SIGINT, &common_sighandler);
264 signal(SIGTERM, &common_sighandler);
265 signal(SIGSEGV, &common_sighandler);
266 syslog(LOG_INFO, "Starting...");
270 static void main_shutdown(void)
275 module_init(main_initialize);
276 module_exit(main_shutdown);
280 fputs("usage: "DAEMON_NAME" [options] config\n"
283 " -p <pidfile> file to write our pid to\n"
289 int main(int argc, char *argv[])
291 const char *pidfile = NULL;
294 for (int c = 0; (c = getopt(argc, argv, "h" "p:")) >= 0; ) {
305 if (argc - optind != 1) {
310 if (pidfile_open(pidfile) < 0) {
311 syslog(LOG_CRIT, "unable to write pidfile %s", pidfile);
315 if (daemon_detach() < 0) {
316 syslog(LOG_CRIT, "unable to fork");
322 syslog(LOG_INFO, "Stopping...");