postlicyd/main-postlicyd.c

   1 /******************************************************************************/
   2 /*          pfixtools: a collection of postfix related tools                  */
   3 /*          ~~~~~~~~~                                                         */
   4 /*  ________________________________________________________________________  */
   5 /*                                                                            */
   6 /*  Redistribution and use in source and binary forms, with or without        */
   7 /*  modification, are permitted provided that the following conditions        */
   8 /*  are met:                                                                  */
   9 /*                                                                            */
  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     */
  17 /*     permission.                                                            */
  18 /*                                                                            */
  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 /******************************************************************************/
  31
  32 /*
  33  * Copyright © 2006-2007 Pierre Habouzit
  34  * Copyright © 2008 Florent Bruneau
  35  */
  36
  37 #include <getopt.h>
  38
  39 #include "buffer.h"
  40 #include "common.h"
  41 #include "epoll.h"
  42 #include "policy_tokens.h"
  43 #include "server.h"
  44 #include "query.h"
  45
  46 #define DAEMON_NAME             "postlicyd"
  47 #define DEFAULT_PORT            10000
  48 #define RUNAS_USER              "nobody"
  49 #define RUNAS_GROUP             "nogroup"
  50
  51 DECLARE_MAIN
  52
  53 static void *query_starter(server_t* server)
  54 {
  55     return query_new();
  56 }
  57
  58 static int postfix_parsejob(query_t *query, char *p)
  59 {
  60 #define PARSE_CHECK(expr, error, ...)                                        \
  61     do {                                                                     \
  62         if (!(expr)) {                                                       \
  63             syslog(LOG_ERR, error, ##__VA_ARGS__);                           \
  64             return -1;                                                       \
  65         }                                                                    \
  66     } while (0)
  67
  68     p_clear(query, 1);
  69     while (*p != '\n') {
  70         char *k, *v;
  71         int klen, vlen, vtk;
  72
  73         while (isblank(*p))
  74             p++;
  75         p = strchr(k = p, '=');
  76         PARSE_CHECK(p, "could not find '=' in line");
  77         for (klen = p - k; klen && isblank(k[klen]); klen--);
  78         p += 1; /* skip = */
  79
  80         while (isblank(*p))
  81             p++;
  82         p = strchr(v = p, '\n');
  83         PARSE_CHECK(p, "could not find final \\n in line");
  84         for (vlen = p - v; vlen && isblank(v[vlen]); vlen--);
  85         p += 1; /* skip \n */
  86
  87         vtk = policy_tokenize(v, vlen);
  88         switch (policy_tokenize(k, klen)) {
  89 #define CASE(up, low)  case PTK_##up: query->low = v; v[vlen] = '\0'; break;
  90             CASE(HELO_NAME,           helo_name);
  91             CASE(QUEUE_ID,            queue_id);
  92             CASE(SENDER,              sender);
  93             CASE(RECIPIENT,           recipient);
  94             CASE(RECIPIENT_COUNT,     recipient_count);
  95             CASE(CLIENT_ADDRESS,      client_address);
  96             CASE(CLIENT_NAME,         client_name);
  97             CASE(REVERSE_CLIENT_NAME, reverse_client_name);
  98             CASE(INSTANCE,            instance);
  99             CASE(SASL_METHOD,         sasl_method);
 100             CASE(SASL_USERNAME,       sasl_username);
 101             CASE(SASL_SENDER,         sasl_sender);
 102             CASE(SIZE,                size);
 103             CASE(CCERT_SUBJECT,       ccert_subject);
 104             CASE(CCERT_ISSUER,        ccert_issuer);
 105             CASE(CCERT_FINGERPRINT,   ccert_fingerprint);
 106             CASE(ENCRYPTION_PROTOCOL, encryption_protocol);
 107             CASE(ENCRYPTION_CIPHER,   encryption_cipher);
 108             CASE(ENCRYPTION_KEYSIZE,  encryption_keysize);
 109             CASE(ETRN_DOMAIN,         etrn_domain);
 110             CASE(STRESS,              stress);
 111 #undef CASE
 112
 113           case PTK_REQUEST:
 114             PARSE_CHECK(vtk == PTK_SMTPD_ACCESS_POLICY,
 115                         "unexpected `request' value: %.*s", vlen, v);
 116             break;
 117
 118           case PTK_PROTOCOL_NAME:
 119             PARSE_CHECK(vtk == PTK_SMTP || vtk == PTK_ESMTP,
 120                         "unexpected `protocol_name' value: %.*s", vlen, v);
 121             query->esmtp = vtk == PTK_ESMTP;
 122             break;
 123
 124           case PTK_PROTOCOL_STATE:
 125             switch (vtk) {
 126 #define CASE(name)  case PTK_##name: query->state = SMTP_##name; break;
 127                 CASE(CONNECT);
 128                 CASE(EHLO);
 129                 CASE(HELO);
 130                 CASE(MAIL);
 131                 CASE(RCPT);
 132                 CASE(DATA);
 133                 CASE(END_OF_MESSAGE);
 134                 CASE(VRFY);
 135                 CASE(ETRN);
 136               default:
 137                 PARSE_CHECK(false, "unexpected `protocol_state` value: %.*s",
 138                             vlen, v);
 139 #undef CASE
 140             }
 141             break;
 142
 143           default:
 144             syslog(LOG_WARNING, "unexpected key, skipped: %.*s", klen, k);
 145             continue;
 146         }
 147     }
 148
 149     return query->state == SMTP_UNKNOWN ? -1 : 0;
 150 #undef PARSE_CHECK
 151 }
 152
 153 __attribute__((format(printf,2,0)))
 154 static void policy_answer(server_t *pcy, const char *fmt, ...)
 155 {
 156     va_list args;
 157     const query_t* query = pcy->data;
 158
 159     buffer_addstr(&pcy->obuf, "action=");
 160     va_start(args, fmt);
 161     buffer_addvf(&pcy->obuf, fmt, args);
 162     va_end(args);
 163     buffer_addstr(&pcy->obuf, "\n\n");
 164     buffer_consume(&pcy->ibuf, query->eoq - pcy->ibuf.data);
 165     epoll_modify(pcy->fd, EPOLLIN | EPOLLOUT, pcy);
 166 }
 167
 168 static bool policy_run_filter(const query_t* query, void* filter, void* conf)
 169 {
 170     return false;
 171 }
 172
 173 static void policy_process(server_t *pcy)
 174 {
 175     const query_t* query = pcy->data;
 176     if (!policy_run_filter(query, NULL, NULL)) {
 177         policy_answer(pcy, "DUNNO");
 178     }
 179 }
 180
 181 static int policy_run(server_t *pcy, void* config)
 182 {
 183     ssize_t search_offs = MAX(0, pcy->ibuf.len - 1);
 184     int nb = buffer_read(&pcy->ibuf, pcy->fd, -1);
 185     const char *eoq;
 186     query_t* query = pcy->data;
 187
 188     if (nb < 0) {
 189         if (errno == EAGAIN || errno == EINTR)
 190             return 0;
 191         UNIXERR("read");
 192         return -1;
 193     }
 194     if (nb == 0) {
 195         if (pcy->ibuf.len)
 196             syslog(LOG_ERR, "unexpected end of data");
 197         return -1;
 198     }
 199
 200     if (!(eoq = strstr(pcy->ibuf.data + search_offs, "\n\n")))
 201         return 0;
 202
 203     if (postfix_parsejob(pcy->data, pcy->ibuf.data) < 0)
 204         return -1;
 205     query->eoq = eoq + strlen("\n\n");
 206     epoll_modify(pcy->fd, 0, pcy);
 207     policy_process(pcy);
 208     return 0;
 209 }
 210
 211 int start_listener(int port)
 212 {
 213     return start_server(port, NULL, NULL);
 214 }
 215
 216 /* administrivia {{{ */
 217
 218 void usage(void)
 219 {
 220     fputs("usage: "DAEMON_NAME" [options] config\n"
 221           "\n"
 222           "Options:\n"
 223           "    -l <port>    port to listen to\n"
 224           "    -p <pidfile> file to write our pid to\n"
 225           "    -f           stay in foreground\n"
 226          , stderr);
 227 }
 228
 229 /* }}} */
 230
 231 int main(int argc, char *argv[])
 232 {
 233     bool unsafe = false;
 234     const char *pidfile = NULL;
 235     bool daemonize = true;
 236     int port = DEFAULT_PORT;
 237
 238     for (int c = 0; (c = getopt(argc, argv, "hf" "l:p:")) >= 0; ) {
 239         switch (c) {
 240           case 'p':
 241             pidfile = optarg;
 242             break;
 243           case 'u':
 244             unsafe = true;
 245             break;
 246           case 'l':
 247             port = atoi(optarg);
 248             break;
 249           case 'f':
 250             daemonize = false;
 251             break;
 252           default:
 253             usage();
 254             return EXIT_FAILURE;
 255         }
 256     }
 257
 258     if (argc - optind != 1) {
 259         usage();
 260         return EXIT_FAILURE;
 261     }
 262
 263     if (common_setup(pidfile, false, RUNAS_USER, RUNAS_GROUP,
 264                      daemonize) != EXIT_SUCCESS
 265         || start_listener(port) < 0) {
 266         return EXIT_FAILURE;
 267     }
 268     return server_loop(query_starter, (delete_client_t)query_delete,
 269                        policy_run, NULL);
 270 }