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
34 * Copyright © 2008 Florent Bruneau
45 #define DAEMON_NAME "postlicyd"
46 #define DEFAULT_PORT 10000
47 #define RUNAS_USER "nobody"
48 #define RUNAS_GROUP "nogroup"
56 SMTP_HELO = SMTP_EHLO,
65 /* \see http://www.postfix.org/SMTPD_POLICY_README.html */
66 typedef struct query_t {
70 const char *helo_name;
73 const char *recipient;
74 const char *recipient_count;
75 const char *client_address;
76 const char *client_name;
77 const char *reverse_client_name;
81 const char *sasl_method;
82 const char *sasl_username;
83 const char *sasl_sender;
85 const char *ccert_subject;
86 const char *ccert_issuer;
87 const char *ccert_fingerprint;
90 const char *encryption_protocol;
91 const char *encryption_cipher;
92 const char *encryption_keysize;
93 const char *etrn_domain;
101 static query_t *query_new(void)
103 return p_new(query_t, 1);
106 static void query_delete(query_t **query)
113 static void *query_starter(server_t* server)
118 static int postfix_parsejob(query_t *query, char *p)
120 #define PARSE_CHECK(expr, error, ...) \
123 syslog(LOG_ERR, error, ##__VA_ARGS__); \
135 p = strchr(k = p, '=');
136 PARSE_CHECK(p, "could not find '=' in line");
137 for (klen = p - k; klen && isblank(k[klen]); klen--);
142 p = strchr(v = p, '\n');
143 PARSE_CHECK(p, "could not find final \\n in line");
144 for (vlen = p - v; vlen && isblank(v[vlen]); vlen--);
145 p += 1; /* skip \n */
147 vtk = tokenize(v, vlen);
148 switch (tokenize(k, klen)) {
149 #define CASE(up, low) case PTK_##up: query->low = v; v[vlen] = '\0'; break;
150 CASE(HELO_NAME, helo_name);
151 CASE(QUEUE_ID, queue_id);
152 CASE(SENDER, sender);
153 CASE(RECIPIENT, recipient);
154 CASE(RECIPIENT_COUNT, recipient_count);
155 CASE(CLIENT_ADDRESS, client_address);
156 CASE(CLIENT_NAME, client_name);
157 CASE(REVERSE_CLIENT_NAME, reverse_client_name);
158 CASE(INSTANCE, instance);
159 CASE(SASL_METHOD, sasl_method);
160 CASE(SASL_USERNAME, sasl_username);
161 CASE(SASL_SENDER, sasl_sender);
163 CASE(CCERT_SUBJECT, ccert_subject);
164 CASE(CCERT_ISSUER, ccert_issuer);
165 CASE(CCERT_FINGERPRINT, ccert_fingerprint);
166 CASE(ENCRYPTION_PROTOCOL, encryption_protocol);
167 CASE(ENCRYPTION_CIPHER, encryption_cipher);
168 CASE(ENCRYPTION_KEYSIZE, encryption_keysize);
169 CASE(ETRN_DOMAIN, etrn_domain);
170 CASE(STRESS, stress);
174 PARSE_CHECK(vtk == PTK_SMTPD_ACCESS_POLICY,
175 "unexpected `request' value: %.*s", vlen, v);
178 case PTK_PROTOCOL_NAME:
179 PARSE_CHECK(vtk == PTK_SMTP || vtk == PTK_ESMTP,
180 "unexpected `protocol_name' value: %.*s", vlen, v);
181 query->esmtp = vtk == PTK_ESMTP;
184 case PTK_PROTOCOL_STATE:
186 #define CASE(name) case PTK_##name: query->state = SMTP_##name; break;
193 CASE(END_OF_MESSAGE);
197 PARSE_CHECK(false, "unexpected `protocol_state` value: %.*s",
204 syslog(LOG_WARNING, "unexpected key, skipped: %.*s", klen, k);
209 return query->state == SMTP_UNKNOWN ? -1 : 0;
213 __attribute__((format(printf,2,0)))
214 static void policy_answer(server_t *pcy, const char *fmt, ...)
217 const query_t* query = pcy->data;
219 buffer_addstr(&pcy->obuf, "action=");
221 buffer_addvf(&pcy->obuf, fmt, args);
223 buffer_addstr(&pcy->obuf, "\n\n");
224 buffer_consume(&pcy->ibuf, query->eoq - pcy->ibuf.data);
225 epoll_modify(pcy->fd, EPOLLIN | EPOLLOUT, pcy);
228 static bool policy_run_filter(const query_t* query, void* filter, void* conf)
233 static void policy_process(server_t *pcy)
235 const query_t* query = pcy->data;
236 if (!policy_run_filter(query, NULL, NULL)) {
237 policy_answer(pcy, "DUNNO");
241 static int policy_run(server_t *pcy, void* config)
243 ssize_t search_offs = MAX(0, pcy->ibuf.len - 1);
244 int nb = buffer_read(&pcy->ibuf, pcy->fd, -1);
246 query_t* query = pcy->data;
249 if (errno == EAGAIN || errno == EINTR)
256 syslog(LOG_ERR, "unexpected end of data");
260 if (!(eoq = strstr(pcy->ibuf.data + search_offs, "\n\n")))
263 if (postfix_parsejob(pcy->data, pcy->ibuf.data) < 0)
265 query->eoq = eoq + strlen("\n\n");
266 epoll_modify(pcy->fd, 0, pcy);
271 int start_listener(int port)
273 return start_server(port, NULL, NULL);
276 /* administrivia {{{ */
280 fputs("usage: "DAEMON_NAME" [options] config\n"
283 " -l <port> port to listen to\n"
284 " -p <pidfile> file to write our pid to\n"
285 " -f stay in foreground\n"
291 int main(int argc, char *argv[])
294 const char *pidfile = NULL;
295 bool daemonize = true;
296 int port = DEFAULT_PORT;
298 for (int c = 0; (c = getopt(argc, argv, "hf" "l:p:")) >= 0; ) {
318 if (argc - optind != 1) {
323 if (common_setup(pidfile, false, RUNAS_USER, RUNAS_GROUP,
324 daemonize) != EXIT_SUCCESS
325 || start_listener(port) < 0) {
328 return server_loop(query_starter, (delete_client_t)query_delete,