src/src/malware.c

   1 /* $Cambridge: exim/src/src/malware.c,v 1.18 2009/11/11 10:08:01 nm4 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-???? */
   8 /* License: GPL */
   9
  10 /* Code for calling virus (malware) scanners. Called from acl.c. */
  11
  12 #include "exim.h"
  13 #ifdef WITH_CONTENT_SCAN
  14
  15 /* declaration of private routines */
  16 int mksd_scan_packed(int sock);
  17
  18 /* SHUT_WR seems to be undefined on Unixware? */
  19 #ifndef SHUT_WR
  20 #define SHUT_WR 1
  21 #endif
  22
  23
  24 #define        MALWARE_TIMEOUT             120
  25
  26
  27 #define DRWEBD_SCAN_CMD             (1)     /* scan file, buffer or diskfile */
  28 #define DRWEBD_RETURN_VIRUSES       (1<<0)   /* ask daemon return to us viruses names from report */
  29 #define DRWEBD_IS_MAIL              (1<<19)  /* say to daemon that format is "archive MAIL" */
  30
  31 #define DERR_READ_ERR               (1<<0)   /* read error */
  32 #define DERR_NOMEMORY               (1<<2)   /* no memory */
  33 #define DERR_TIMEOUT                (1<<9)   /* scan timeout has run out */
  34 #define DERR_BAD_CALL               (1<<15)  /* wrong command */
  35
  36 /* Routine to check whether a system is big- or litte-endian.
  37    Ripped from http://www.faqs.org/faqs/graphics/fileformats-faq/part4/section-7.html
  38    Needed for proper kavdaemon implementation. Sigh. */
  39 #define BIG_MY_ENDIAN      0
  40 #define LITTLE_MY_ENDIAN   1
  41 int test_byte_order(void);
  42 int test_byte_order() {
  43       short int word = 0x0001;
  44       char *byte = (char *) &word;
  45       return(byte[0] ? LITTLE_MY_ENDIAN : BIG_MY_ENDIAN);
  46 }
  47
  48 uschar malware_name_buffer[256];
  49 int malware_ok = 0;
  50
  51 int malware(uschar **listptr) {
  52   int sep = 0;
  53   uschar *list = *listptr;
  54   uschar *av_scanner_work = av_scanner;
  55   uschar *scanner_name;
  56   uschar scanner_name_buffer[16];
  57   uschar *malware_regex;
  58   uschar malware_regex_buffer[64];
  59   uschar malware_regex_default[] = ".+";
  60   unsigned long mbox_size;
  61   FILE *mbox_file;
  62   int roffset;
  63   const pcre *re;
  64   const uschar *rerror;
  65
  66   /* make sure the eml mbox file is spooled up */
  67   mbox_file = spool_mbox(&mbox_size);
  68   if (mbox_file == NULL) {
  69     /* error while spooling */
  70     log_write(0, LOG_MAIN|LOG_PANIC,
  71            "malware acl condition: error while creating mbox spool file");
  72     return DEFER;
  73   };
  74   /* none of our current scanners need the mbox
  75      file as a stream, so we can close it right away */
  76   (void)fclose(mbox_file);
  77
  78   /* extract the malware regex to match against from the option list */
  79   if ((malware_regex = string_nextinlist(&list, &sep,
  80                                          malware_regex_buffer,
  81                                          sizeof(malware_regex_buffer))) != NULL) {
  82
  83     /* parse 1st option */
  84     if ( (strcmpic(malware_regex,US"false") == 0) ||
  85          (Ustrcmp(malware_regex,"0") == 0) ) {
  86       /* explicitly no matching */
  87       return FAIL;
  88     };
  89
  90     /* special cases (match anything except empty) */
  91     if ( (strcmpic(malware_regex,US"true") == 0) ||
  92          (Ustrcmp(malware_regex,"*") == 0) ||
  93          (Ustrcmp(malware_regex,"1") == 0) ) {
  94       malware_regex = malware_regex_default;
  95     };
  96   }
  97   else {
  98     /* empty means "don't match anything" */
  99     return FAIL;
 100   };
 101
 102   /* Reset sep that is set by previous string_nextinlist() call */
 103   sep = 0;
 104
 105   /* compile the regex, see if it works */
 106   re = pcre_compile(CS malware_regex, PCRE_COPT, (const char **)&rerror, &roffset, NULL);
 107   if (re == NULL) {
 108     log_write(0, LOG_MAIN|LOG_PANIC,
 109              "malware acl condition: regular expression error in '%s': %s at offset %d", malware_regex, rerror, roffset);
 110     return DEFER;
 111   };
 112
 113   /* if av_scanner starts with a dollar, expand it first */
 114   if (*av_scanner == '$') {
 115     av_scanner_work = expand_string(av_scanner);
 116     if (av_scanner_work == NULL) {
 117       log_write(0, LOG_MAIN|LOG_PANIC,
 118            "malware acl condition: av_scanner starts with $, but expansion failed: %s", expand_string_message);
 119       return DEFER;
 120     }
 121     else {
 122       debug_printf("Expanded av_scanner global: %s\n", av_scanner_work);
 123       /* disable result caching in this case */
 124       malware_name = NULL;
 125       malware_ok = 0;
 126     };
 127   }
 128
 129   /* Do not scan twice. */
 130   if (malware_ok == 0) {
 131
 132     /* find the scanner type from the av_scanner option */
 133     if ((scanner_name = string_nextinlist(&av_scanner_work, &sep,
 134                                           scanner_name_buffer,
 135                                           sizeof(scanner_name_buffer))) == NULL) {
 136       /* no scanner given */
 137       log_write(0, LOG_MAIN|LOG_PANIC,
 138              "malware acl condition: av_scanner configuration variable is empty");
 139       return DEFER;
 140     };
 141
 142   /* "f-protd" scanner type ----------------------------------------------- */
 143   if (strcmpic(scanner_name, US"f-protd") == 0) {
 144     uschar *fp_options, *fp_scan_option;
 145     uschar fp_scan_option_buffer[1024];
 146     uschar fp_options_buffer[1024];
 147     uschar fp_options_default[] = "localhost 10200-10204";
 148     uschar hostname[256];
 149     unsigned int port, portlow, porthigh, connect_ok=0, detected=0, par_count = 0;
 150     struct hostent *he;
 151     struct in_addr in;
 152     int sock;
 153     uschar scanrequest[2048], buf[32768], *strhelper, *strhelper2;
 154
 155     if ((fp_options = string_nextinlist(&av_scanner_work, &sep,
 156       fp_options_buffer, sizeof(fp_options_buffer))) == NULL) {
 157       /* no options supplied, use default options */
 158       fp_options = fp_options_default;
 159     };
 160
 161     /* extract host and port part */
 162     if ( sscanf(CS fp_options, "%s %u-%u", hostname, &portlow, &porthigh) != 3 ) {
 163       if ( sscanf(CS fp_options, "%s %u", hostname, &portlow) != 2 ) {
 164         log_write(0, LOG_MAIN|LOG_PANIC,
 165           "malware acl condition: f-protd: invalid socket '%s'", fp_options);
 166         return DEFER;
 167       }
 168       porthigh = portlow;
 169     }
 170
 171     /* Lookup the host */
 172     if((he = gethostbyname(CS hostname)) == 0) {
 173       log_write(0, LOG_MAIN|LOG_PANIC,
 174         "malware acl condition: f-protd: failed to lookup host '%s'", hostname);
 175       return DEFER;
 176     }
 177
 178     in = *(struct in_addr *) he->h_addr_list[0];
 179     port = portlow;
 180
 181
 182     /* Open the f-protd TCP socket */
 183     if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) {
 184       log_write(0, LOG_MAIN|LOG_PANIC,
 185         "malware acl condition: f-protd: unable to acquire socket (%s)",
 186         strerror(errno));
 187       return DEFER;
 188     }
 189
 190     /* Try to connect to all portslow-high until connection is established */
 191     for (port = portlow; !connect_ok && port < porthigh; port++) {
 192       if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(in), port, 5) >= 0) {
 193         connect_ok = 1;
 194       }
 195     }
 196
 197     if ( !connect_ok ) {
 198       log_write(0, LOG_MAIN|LOG_PANIC,
 199         "malware acl condition: f-protd: connection to %s, port %u-%u failed (%s)",
 200         inet_ntoa(in), portlow, porthigh, strerror(errno));
 201       (void)close(sock);
 202       return DEFER;
 203     }
 204
 205     (void)string_format(scanrequest, 1024, CS"GET %s/scan/%s/%s.eml",
 206           spool_directory, message_id, message_id);
 207
 208     while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep,
 209       fp_scan_option_buffer, sizeof(fp_scan_option_buffer))) != NULL) {
 210       if ( par_count ) {
 211         Ustrcat(scanrequest, "%20");
 212       } else {
 213         Ustrcat(scanrequest, "?");
 214       }
 215       Ustrcat(scanrequest, fp_scan_option);
 216       par_count++;
 217     }
 218     Ustrcat(scanrequest, " HTTP/1.0\r\n\r\n");
 219
 220     /* send scan request */
 221     if (send(sock, &scanrequest, Ustrlen(scanrequest)+1, 0) < 0) {
 222       (void)close(sock);
 223       log_write(0, LOG_MAIN|LOG_PANIC,
 224         "malware acl condition: f-protd: unable to send command to socket (%s)", scanrequest);
 225       return DEFER;
 226     }
 227
 228     /* We get a lot of empty lines, so we need this hack to check for any data at all */
 229     while( recv(sock, buf, 1, MSG_PEEK) > 0 ) {
 230       if ( recv_line(sock, buf, 32768) > 0) {
 231         if ( Ustrstr(buf, US"<detected type=\"") != NULL ) {
 232           detected = 1;
 233         } else if ( detected && (strhelper = Ustrstr(buf, US"<name>")) ) {
 234           if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) {
 235             *strhelper2 = '\0';
 236             Ustrcpy(malware_name_buffer, strhelper + 6);
 237           }
 238         } else if ( Ustrstr(buf, US"<summary code=\"") ) {
 239           if ( Ustrstr(buf, US"<summary code=\"11\">") ) {
 240             malware_name = malware_name_buffer;
 241           } else {
 242             malware_name = NULL;
 243           }
 244         }
 245       }
 246     }
 247     (void)close(sock);
 248   }
 249   /* "drweb" scanner type ----------------------------------------------- */
 250   /* v0.1 - added support for tcp sockets          */
 251   /* v0.0 - initial release -- support for unix sockets      */
 252   else if (strcmpic(scanner_name,US"drweb") == 0) {
 253     uschar *drweb_options;
 254     uschar drweb_options_buffer[1024];
 255     uschar drweb_options_default[] = "/usr/local/drweb/run/drwebd.sock";
 256     struct sockaddr_un server;
 257     int sock, result, ovector[30];
 258     unsigned int port, fsize;
 259     uschar tmpbuf[1024], *drweb_fbuf;
 260     uschar scanrequest[1024];
 261     uschar drweb_match_string[128];
 262     int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd,
 263         drweb_vnum, drweb_slen, drweb_fin = 0x0000;
 264     unsigned long bread;
 265     uschar hostname[256];
 266     struct hostent *he;
 267     struct in_addr in;
 268     pcre *drweb_re;
 269
 270     if ((drweb_options = string_nextinlist(&av_scanner_work, &sep,
 271       drweb_options_buffer, sizeof(drweb_options_buffer))) == NULL) {
 272       /* no options supplied, use default options */
 273       drweb_options = drweb_options_default;
 274     };
 275
 276     if (*drweb_options != '/') {
 277
 278       /* extract host and port part */
 279       if( sscanf(CS drweb_options, "%s %u", hostname, &port) != 2 ) {
 280         log_write(0, LOG_MAIN|LOG_PANIC,
 281           "malware acl condition: drweb: invalid socket '%s'", drweb_options);
 282         return DEFER;
 283       }
 284
 285       /* Lookup the host */
 286       if((he = gethostbyname(CS hostname)) == 0) {
 287         log_write(0, LOG_MAIN|LOG_PANIC,
 288           "malware acl condition: drweb: failed to lookup host '%s'", hostname);
 289         return DEFER;
 290       }
 291
 292       in = *(struct in_addr *) he->h_addr_list[0];
 293
 294       /* Open the drwebd TCP socket */
 295       if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) {
 296         log_write(0, LOG_MAIN|LOG_PANIC,
 297           "malware acl condition: drweb: unable to acquire socket (%s)",
 298           strerror(errno));
 299         return DEFER;
 300       }
 301
 302       if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) {
 303         (void)close(sock);
 304         log_write(0, LOG_MAIN|LOG_PANIC,
 305           "malware acl condition: drweb: connection to %s, port %u failed (%s)",
 306           inet_ntoa(in), port, strerror(errno));
 307         return DEFER;
 308       }
 309
 310       /* prepare variables */
 311       drweb_cmd = htonl(DRWEBD_SCAN_CMD);
 312       drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL);
 313       (void)string_format(scanrequest, 1024,CS"%s/scan/%s/%s.eml",
 314             spool_directory, message_id, message_id);
 315
 316       /* calc file size */
 317       drweb_fd = open(CS scanrequest, O_RDONLY);
 318       if (drweb_fd == -1) {
 319         (void)close(sock);
 320         log_write(0, LOG_MAIN|LOG_PANIC,
 321           "malware acl condition: drweb: can't open spool file %s: %s",
 322           scanrequest, strerror(errno));
 323         return DEFER;
 324       }
 325       fsize = lseek(drweb_fd, 0, SEEK_END);
 326       if (fsize == -1) {
 327         (void)close(sock);
 328         (void)close(drweb_fd);
 329         log_write(0, LOG_MAIN|LOG_PANIC,
 330           "malware acl condition: drweb: can't seek spool file %s: %s",
 331           scanrequest, strerror(errno));
 332         return DEFER;
 333       }
 334       drweb_slen = htonl(fsize);
 335       lseek(drweb_fd, 0, SEEK_SET);
 336
 337       /* send scan request */
 338       if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
 339           (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
 340           (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) ||
 341           (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) {
 342         (void)close(sock);
 343         (void)close(drweb_fd);
 344         log_write(0, LOG_MAIN|LOG_PANIC,
 345           "malware acl condition: drweb: unable to send commands to socket (%s)", drweb_options);
 346         return DEFER;
 347       }
 348
 349       drweb_fbuf = (uschar *) malloc (fsize);
 350       if (!drweb_fbuf) {
 351         (void)close(sock);
 352         (void)close(drweb_fd);
 353         log_write(0, LOG_MAIN|LOG_PANIC,
 354           "malware acl condition: drweb: unable to allocate memory %u for file (%s)",
 355           fsize, scanrequest);
 356         return DEFER;
 357       }
 358
 359       result = read (drweb_fd, drweb_fbuf, fsize);
 360       if (result == -1) {
 361         (void)close(sock);
 362         (void)close(drweb_fd);
 363         free(drweb_fbuf);
 364         log_write(0, LOG_MAIN|LOG_PANIC,
 365           "malware acl condition: drweb: can't read spool file %s: %s",
 366           scanrequest, strerror(errno));
 367         return DEFER;
 368       }
 369       (void)close(drweb_fd);
 370
 371       /* send file body to socket */
 372       if (send(sock, drweb_fbuf, fsize, 0) < 0) {
 373         (void)close(sock);
 374         free(drweb_fbuf);
 375         log_write(0, LOG_MAIN|LOG_PANIC,
 376           "malware acl condition: drweb: unable to send file body to socket (%s)", drweb_options);
 377         return DEFER;
 378       }
 379       (void)close(drweb_fd);
 380     }
 381     else {
 382       /* open the drwebd UNIX socket */
 383       sock = socket(AF_UNIX, SOCK_STREAM, 0);
 384       if (sock < 0) {
 385         log_write(0, LOG_MAIN|LOG_PANIC,
 386           "malware acl condition: drweb: can't open UNIX socket");
 387         return DEFER;
 388       }
 389       server.sun_family = AF_UNIX;
 390       Ustrcpy(server.sun_path, drweb_options);
 391       if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
 392         (void)close(sock);
 393         log_write(0, LOG_MAIN|LOG_PANIC,
 394           "malware acl condition: drweb: unable to connect to socket (%s). errno=%d", drweb_options, errno);
 395         return DEFER;
 396       }
 397
 398       /* prepare variables */
 399       drweb_cmd = htonl(DRWEBD_SCAN_CMD);
 400       drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL);
 401       (void)string_format(scanrequest, 1024,CS"%s/scan/%s/%s.eml", spool_directory, message_id, message_id);
 402       drweb_slen = htonl(Ustrlen(scanrequest));
 403
 404       /* send scan request */
 405       if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
 406           (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
 407           (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) ||
 408           (send(sock, scanrequest, Ustrlen(scanrequest), 0) < 0) ||
 409           (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0)) {
 410         (void)close(sock);
 411         log_write(0, LOG_MAIN|LOG_PANIC,
 412           "malware acl condition: drweb: unable to send commands to socket (%s)", drweb_options);
 413         return DEFER;
 414       }
 415     }
 416
 417     /* wait for result */
 418     if ((bread = recv(sock, &drweb_rc, sizeof(drweb_rc), 0) != sizeof(drweb_rc))) {
 419       (void)close(sock);
 420       log_write(0, LOG_MAIN|LOG_PANIC,
 421         "malware acl condition: drweb: unable to read return code");
 422       return DEFER;
 423     }
 424     drweb_rc = ntohl(drweb_rc);
 425
 426     if ((bread = recv(sock, &drweb_vnum, sizeof(drweb_vnum), 0) != sizeof(drweb_vnum))) {
 427       (void)close(sock);
 428       log_write(0, LOG_MAIN|LOG_PANIC,
 429         "malware acl condition: drweb: unable to read the number of viruses");
 430       return DEFER;
 431     }
 432     drweb_vnum = ntohl(drweb_vnum);
 433
 434     /* "virus(es) found" if virus number is > 0 */
 435     if (drweb_vnum)
 436     {
 437       int i;
 438       uschar pre_malware_nb[256];
 439
 440       malware_name = malware_name_buffer;
 441
 442       /* setup default virus name */
 443       Ustrcpy(malware_name_buffer,"unknown");
 444
 445       /* read and concatenate virus names into one string */
 446       for (i=0;i<drweb_vnum;i++)
 447       {
 448         /* read the size of report */
 449         if ((bread = recv(sock, &drweb_slen, sizeof(drweb_slen), 0) != sizeof(drweb_slen))) {
 450           (void)close(sock);
 451           log_write(0, LOG_MAIN|LOG_PANIC,
 452             "malware acl condition: drweb: cannot read report size");
 453           return DEFER;
 454         };
 455         drweb_slen = ntohl(drweb_slen);
 456
 457         /* read report body */
 458         if ((bread = recv(sock, tmpbuf, drweb_slen, 0)) != drweb_slen) {
 459           (void)close(sock);
 460           log_write(0, LOG_MAIN|LOG_PANIC,
 461             "malware acl condition: drweb: cannot read report string");
 462           return DEFER;
 463         };
 464         tmpbuf[drweb_slen] = '\0';
 465
 466         /* set up match regex, depends on retcode */
 467         Ustrcpy(drweb_match_string, "infected\\swith\\s*(.+?)$");
 468
 469         drweb_re = pcre_compile( CS drweb_match_string,
 470           PCRE_COPT,
 471           (const char **)&rerror,
 472           &roffset,
 473           NULL );
 474
 475         /* try matcher on the line, grab substring */
 476         result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0, ovector, 30);
 477         if (result >= 2) {
 478           pcre_copy_substring(CS tmpbuf, ovector, result, 1, CS pre_malware_nb, 255);
 479         }
 480         /* the first name we just copy to malware_name */
 481         if (i==0)
 482           Ustrcpy(CS malware_name_buffer, CS pre_malware_nb);
 483         else {
 484           /* concatenate each new virus name to previous */
 485           int slen = Ustrlen(malware_name_buffer);
 486           if (slen < (slen+Ustrlen(pre_malware_nb))) {
 487             Ustrcat(malware_name_buffer, "/");
 488             Ustrcat(malware_name_buffer, pre_malware_nb);
 489           }
 490         }
 491       }
 492     }
 493     else {
 494       char *drweb_s = NULL;
 495
 496       if (drweb_rc & DERR_READ_ERR) drweb_s = "read error";
 497       if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory";
 498       if (drweb_rc & DERR_TIMEOUT)  drweb_s = "timeout";
 499       if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command";
 500       /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED.
 501        * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM,
 502        * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR
 503        * and others are ignored */
 504       if (drweb_s) {
 505         log_write(0, LOG_MAIN|LOG_PANIC,
 506           "malware acl condition: drweb: drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s);
 507         (void)close(sock);
 508         return DEFER;
 509       }
 510       /* no virus found */
 511       malware_name = NULL;
 512     };
 513     (void)close(sock);
 514   }
 515   /* ----------------------------------------------------------------------- */
 516     else if (strcmpic(scanner_name,US"aveserver") == 0) {
 517       uschar *kav_options;
 518       uschar kav_options_buffer[1024];
 519       uschar kav_options_default[] = "/var/run/aveserver";
 520       uschar buf[32768];
 521       struct sockaddr_un server;
 522       int sock;
 523       int result;
 524
 525       if ((kav_options = string_nextinlist(&av_scanner_work, &sep,
 526                                            kav_options_buffer,
 527                                            sizeof(kav_options_buffer))) == NULL) {
 528         /* no options supplied, use default options */
 529         kav_options = kav_options_default;
 530       };
 531
 532       /* open the aveserver socket */
 533       sock = socket(AF_UNIX, SOCK_STREAM, 0);
 534       if (sock < 0) {
 535         log_write(0, LOG_MAIN|LOG_PANIC,
 536              "malware acl condition: can't open UNIX socket.");
 537         return DEFER;
 538       }
 539       server.sun_family = AF_UNIX;
 540       Ustrcpy(server.sun_path, kav_options);
 541       if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
 542         (void)close(sock);
 543         log_write(0, LOG_MAIN|LOG_PANIC,
 544              "malware acl condition: unable to connect to aveserver UNIX socket (%s). errno=%d", kav_options, errno);
 545         return DEFER;
 546       }
 547
 548       /* read aveserver's greeting and see if it is ready (2xx greeting) */
 549       recv_line(sock, buf, 32768);
 550
 551       if (buf[0] != '2') {
 552         /* aveserver is having problems */
 553         (void)close(sock);
 554         log_write(0, LOG_MAIN|LOG_PANIC,
 555              "malware acl condition: aveserver is unavailable (Responded: %s).", ((buf[0] != 0) ? buf : (uschar *)"nothing") );
 556         return DEFER;
 557       };
 558
 559       /* prepare our command */
 560       (void)string_format(buf, 32768, "SCAN bPQRSTUW %s/scan/%s/%s.eml\r\n", spool_directory, message_id, message_id);
 561
 562       /* and send it */
 563       if (send(sock, buf, Ustrlen(buf), 0) < 0) {
 564         (void)close(sock);
 565         log_write(0, LOG_MAIN|LOG_PANIC,
 566              "malware acl condition: unable to write to aveserver UNIX socket (%s)", kav_options);
 567         return DEFER;
 568       }
 569
 570       malware_name = NULL;
 571       result = 0;
 572       /* read response lines, find malware name and final response */
 573       while (recv_line(sock, buf, 32768) > 0) {
 574         debug_printf("aveserver: %s\n", buf);
 575         if (buf[0] == '2') {
 576     break;
 577   } else if (buf[0] == '5') {
 578           /* aveserver is having problems */
 579           log_write(0, LOG_MAIN|LOG_PANIC,
 580              "malware acl condition: unable to scan file %s/scan/%s/%s.eml (Responded: %s).",
 581        spool_directory, message_id, message_id, buf);
 582           result = DEFER;
 583     break;
 584   } else if (Ustrncmp(buf,"322",3) == 0) {
 585           uschar *p = Ustrchr(&buf[4],' ');
 586           *p = '\0';
 587           Ustrcpy(malware_name_buffer,&buf[4]);
 588           malware_name = malware_name_buffer;
 589   };
 590       }
 591
 592       /* prepare our command */
 593       (void)string_format(buf, 32768, "quit\r\n");
 594
 595       /* and send it */
 596       if (send(sock, buf, Ustrlen(buf), 0) < 0) {
 597         (void)close(sock);
 598         log_write(0, LOG_MAIN|LOG_PANIC,
 599              "malware acl condition: unable to write to aveserver UNIX socket (%s)", kav_options);
 600         return DEFER;
 601       }
 602
 603       /* read aveserver's greeting and see if it is ready (2xx greeting) */
 604       recv_line(sock, buf, 32768);
 605
 606       if (buf[0] != '2') {
 607         /* aveserver is having problems */
 608         (void)close(sock);
 609         log_write(0, LOG_MAIN|LOG_PANIC,
 610              "malware acl condition: unable to quit aveserver dialogue (Responded: %s).", ((buf[0] != 0) ? buf : (uschar *)"nothing") );
 611         return DEFER;
 612       };
 613
 614       (void)close(sock);
 615
 616       if (result == DEFER) return DEFER;
 617     }
 618     /* "fsecure" scanner type ------------------------------------------------- */
 619     else if (strcmpic(scanner_name,US"fsecure") == 0) {
 620       uschar *fsecure_options;
 621       uschar fsecure_options_buffer[1024];
 622       uschar fsecure_options_default[] = "/var/run/.fsav";
 623       struct sockaddr_un server;
 624       int sock, i, j, bread = 0;
 625       uschar file_name[1024];
 626       uschar av_buffer[1024];
 627       pcre *fs_inf;
 628       static uschar *cmdoptions[] = { US"CONFIGURE\tARCHIVE\t1\n",
 629                                       US"CONFIGURE\tTIMEOUT\t0\n",
 630                                       US"CONFIGURE\tMAXARCH\t5\n",
 631                                       US"CONFIGURE\tMIME\t1\n" };
 632
 633       malware_name = NULL;
 634       if ((fsecure_options = string_nextinlist(&av_scanner_work, &sep,
 635                                                fsecure_options_buffer,
 636                                                sizeof(fsecure_options_buffer))) == NULL) {
 637          /* no options supplied, use default options */
 638          fsecure_options = fsecure_options_default;
 639       };
 640
 641       /* open the fsecure socket */
 642       sock = socket(AF_UNIX, SOCK_STREAM, 0);
 643       if (sock < 0) {
 644         log_write(0, LOG_MAIN|LOG_PANIC,
 645                   "malware acl condition: unable to open fsecure socket %s (%s)",
 646                   fsecure_options, strerror(errno));
 647         return DEFER;
 648       }
 649       server.sun_family = AF_UNIX;
 650       Ustrcpy(server.sun_path, fsecure_options);
 651       if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
 652         (void)close(sock);
 653         log_write(0, LOG_MAIN|LOG_PANIC,
 654                   "malware acl condition: unable to connect to fsecure socket %s (%s)",
 655                   fsecure_options, strerror(errno));
 656         return DEFER;
 657       }
 658
 659       /* pass options */
 660       memset(av_buffer, 0, sizeof(av_buffer));
 661       for (i=0; i != 4; i++) {
 662         /* debug_printf("send option \"%s\"",cmdoptions[i]); */
 663         if (write(sock, cmdoptions[i], Ustrlen(cmdoptions[i])) < 0) {
 664           (void)close(sock);
 665           log_write(0, LOG_MAIN|LOG_PANIC,
 666                     "malware acl condition: unable to write fsecure option %d to %s (%s)",
 667                     i, fsecure_options, strerror(errno));
 668           return DEFER;
 669         };
 670
 671         bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
 672         if (bread >0) av_buffer[bread]='\0';
 673         if (bread < 0) {
 674           (void)close(sock);
 675           log_write(0, LOG_MAIN|LOG_PANIC,
 676                     "malware acl condition: unable to read fsecure answer %d (%s)", i, strerror(errno));
 677           return DEFER;
 678         };
 679         for (j=0;j<bread;j++) if((av_buffer[j]=='\r')||(av_buffer[j]=='\n')) av_buffer[j] ='@';
 680         /* debug_printf("read answer %d read=%d \"%s\"\n", i, bread, av_buffer ); */
 681         /* while (Ustrstr(av_buffer, "OK\tServer configured.@") == NULL); */
 682       };
 683
 684       /* pass the mailfile to fsecure */
 685       (void)string_format(file_name,1024,"SCAN\t%s/scan/%s/%s.eml\n", spool_directory, message_id, message_id);
 686       /* debug_printf("send scan %s",file_name); */
 687       if (write(sock, file_name, Ustrlen(file_name)) < 0) {
 688         (void)close(sock);
 689         log_write(0, LOG_MAIN|LOG_PANIC,
 690                   "malware acl condition: unable to write fsecure scan to %s (%s)",
 691                   fsecure_options, strerror(errno));
 692         return DEFER;
 693       };
 694
 695       /* set up match */
 696       /* todo also SUSPICION\t */
 697       fs_inf = pcre_compile("\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$", PCRE_COPT, (const char **)&rerror, &roffset, NULL);
 698
 699       /* read report, linewise */
 700       do {
 701         int ovector[30];
 702         i = 0;
 703         memset(av_buffer, 0, sizeof(av_buffer));
 704         do {
 705           bread=ip_recv(sock, &av_buffer[i], 1, MALWARE_TIMEOUT);
 706           if (bread < 0) {
 707             (void)close(sock);
 708             log_write(0, LOG_MAIN|LOG_PANIC,
 709                       "malware acl condition: unable to read fsecure result (%s)", strerror(errno));
 710             return DEFER;
 711           };
 712           i++;
 713         }
 714         while ((i < sizeof(av_buffer)-1 ) && (av_buffer[i-1] != '\n'));
 715         av_buffer[i-1] = '\0';
 716         /* debug_printf("got line \"%s\"\n",av_buffer); */
 717
 718         /* Really search for virus again? */
 719         if (malware_name == NULL) {
 720           /* try matcher on the line, grab substring */
 721           i = pcre_exec(fs_inf, NULL, CS av_buffer, Ustrlen(av_buffer), 0, 0, ovector, 30);
 722           if (i >= 2) {
 723             /* Got it */
 724             pcre_copy_substring(CS av_buffer, ovector, i, 1, CS malware_name_buffer, 255);
 725             malware_name = malware_name_buffer;
 726           };
 727         };
 728       }
 729       while (Ustrstr(av_buffer, "OK\tScan ok.") == NULL);
 730       (void)close(sock);
 731     }
 732     /* ----------------------------------------------------------------------- */
 733
 734     /* "kavdaemon" scanner type ------------------------------------------------ */
 735     else if (strcmpic(scanner_name,US"kavdaemon") == 0) {
 736       uschar *kav_options;
 737       uschar kav_options_buffer[1024];
 738       uschar kav_options_default[] = "/var/run/AvpCtl";
 739       struct sockaddr_un server;
 740       int sock;
 741       time_t t;
 742       uschar tmpbuf[1024];
 743       uschar scanrequest[1024];
 744       uschar kav_match_string[128];
 745       int kav_rc;
 746       unsigned long kav_reportlen, bread;
 747       pcre *kav_re;
 748
 749       if ((kav_options = string_nextinlist(&av_scanner_work, &sep,
 750                                            kav_options_buffer,
 751                                            sizeof(kav_options_buffer))) == NULL) {
 752         /* no options supplied, use default options */
 753         kav_options = kav_options_default;
 754       };
 755
 756       /* open the kavdaemon socket */
 757       sock = socket(AF_UNIX, SOCK_STREAM, 0);
 758       if (sock < 0) {
 759         log_write(0, LOG_MAIN|LOG_PANIC,
 760              "malware acl condition: can't open UNIX socket.");
 761         return DEFER;
 762       }
 763       server.sun_family = AF_UNIX;
 764       Ustrcpy(server.sun_path, kav_options);
 765       if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
 766         (void)close(sock);
 767         log_write(0, LOG_MAIN|LOG_PANIC,
 768              "malware acl condition: unable to connect to kavdaemon UNIX socket (%s). errno=%d", kav_options, errno);
 769         return DEFER;
 770       }
 771
 772       /* get current date and time, build scan request */
 773       time(&t);
 774       strftime(CS tmpbuf, sizeof(tmpbuf), "<0>%d %b %H:%M:%S:%%s/scan/%%s", localtime(&t));
 775       (void)string_format(scanrequest, 1024,CS tmpbuf, spool_directory, message_id);
 776
 777       /* send scan request */
 778       if (send(sock, scanrequest, Ustrlen(scanrequest)+1, 0) < 0) {
 779         (void)close(sock);
 780         log_write(0, LOG_MAIN|LOG_PANIC,
 781              "malware acl condition: unable to write to kavdaemon UNIX socket (%s)", kav_options);
 782         return DEFER;
 783       }
 784
 785       /* wait for result */
 786       if ((bread = recv(sock, tmpbuf, 2, 0) != 2)) {
 787         (void)close(sock);
 788         log_write(0, LOG_MAIN|LOG_PANIC,
 789              "malware acl condition: unable to read 2 bytes from kavdaemon socket.");
 790         return DEFER;
 791       }
 792
 793       /* get errorcode from one nibble */
 794       if (test_byte_order() == LITTLE_MY_ENDIAN) {
 795         kav_rc = tmpbuf[0] & 0x0F;
 796       }
 797       else {
 798         kav_rc = tmpbuf[1] & 0x0F;
 799       };
 800
 801       /* improper kavdaemon configuration */
 802       if ( (kav_rc == 5) || (kav_rc == 6) ) {
 803         (void)close(sock);
 804         log_write(0, LOG_MAIN|LOG_PANIC,
 805              "malware acl condition: please reconfigure kavdaemon to NOT disinfect or remove infected files.");
 806         return DEFER;
 807       };
 808
 809       if (kav_rc == 1) {
 810         (void)close(sock);
 811         log_write(0, LOG_MAIN|LOG_PANIC,
 812              "malware acl condition: kavdaemon reported 'scanning not completed' (code 1).");
 813         return DEFER;
 814       };
 815
 816       if (kav_rc == 7) {
 817         (void)close(sock);
 818         log_write(0, LOG_MAIN|LOG_PANIC,
 819              "malware acl condition: kavdaemon reported 'kavdaemon damaged' (code 7).");
 820         return DEFER;
 821       };
 822
 823       /* code 8 is not handled, since it is ambigous. It appears mostly on
 824       bounces where part of a file has been cut off */
 825
 826       /* "virus found" return codes (2-4) */
 827       if ((kav_rc > 1) && (kav_rc < 5)) {
 828         int report_flag = 0;
 829
 830         /* setup default virus name */
 831         Ustrcpy(malware_name_buffer,"unknown");
 832         malware_name = malware_name_buffer;
 833
 834         if (test_byte_order() == LITTLE_MY_ENDIAN) {
 835           report_flag = tmpbuf[1];
 836         }
 837         else {
 838           report_flag = tmpbuf[0];
 839         };
 840
 841         /* read the report, if available */
 842         if( report_flag == 1 ) {
 843           /* read report size */
 844           if ((bread = recv(sock, &kav_reportlen, 4, 0)) != 4) {
 845             (void)close(sock);
 846             log_write(0, LOG_MAIN|LOG_PANIC,
 847                   "malware acl condition: cannot read report size from kavdaemon");
 848             return DEFER;
 849           };
 850
 851           /* it's possible that avp returns av_buffer[1] == 1 but the
 852           reportsize is 0 (!?) */
 853           if (kav_reportlen > 0) {
 854             /* set up match regex, depends on retcode */
 855             if( kav_rc == 3 )
 856               Ustrcpy(kav_match_string, "suspicion:\\s*(.+?)\\s*$");
 857             else
 858               Ustrcpy(kav_match_string, "infected:\\s*(.+?)\\s*$");
 859
 860             kav_re = pcre_compile( CS kav_match_string,
 861                                    PCRE_COPT,
 862                                    (const char **)&rerror,
 863                                    &roffset,
 864                                    NULL );
 865
 866             /* read report, linewise */
 867             while (kav_reportlen > 0) {
 868               int result = 0;
 869               int ovector[30];
 870
 871               bread = 0;
 872               while ( recv(sock, &tmpbuf[bread], 1, 0) == 1 ) {
 873                 kav_reportlen--;
 874                 if ( (tmpbuf[bread] == '\n') || (bread > 1021) ) break;
 875                 bread++;
 876               };
 877               bread++;
 878               tmpbuf[bread] = '\0';
 879
 880               /* try matcher on the line, grab substring */
 881               result = pcre_exec(kav_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0, ovector, 30);
 882               if (result >= 2) {
 883                 pcre_copy_substring(CS tmpbuf, ovector, result, 1, CS malware_name_buffer, 255);
 884                 break;
 885               };
 886             };
 887           };
 888         };
 889       }
 890       else {
 891         /* no virus found */
 892         malware_name = NULL;
 893       };
 894
 895       (void)close(sock);
 896     }
 897     /* ----------------------------------------------------------------------- */
 898
 899
 900     /* "cmdline" scanner type ------------------------------------------------ */
 901     else if (strcmpic(scanner_name,US"cmdline") == 0) {
 902       uschar *cmdline_scanner;
 903       uschar cmdline_scanner_buffer[1024];
 904       uschar *cmdline_trigger;
 905       uschar cmdline_trigger_buffer[1024];
 906       const pcre *cmdline_trigger_re;
 907       uschar *cmdline_regex;
 908       uschar cmdline_regex_buffer[1024];
 909       const pcre *cmdline_regex_re;
 910       uschar file_name[1024];
 911       uschar commandline[1024];
 912       void (*eximsigchld)(int);
 913       void (*eximsigpipe)(int);
 914       FILE *scanner_out = NULL;
 915       FILE *scanner_record = NULL;
 916       uschar linebuffer[32767];
 917       int trigger = 0;
 918       int result;
 919       int ovector[30];
 920
 921       /* find scanner command line */
 922       if ((cmdline_scanner = string_nextinlist(&av_scanner_work, &sep,
 923                                           cmdline_scanner_buffer,
 924                                           sizeof(cmdline_scanner_buffer))) == NULL) {
 925         /* no command line supplied */
 926         log_write(0, LOG_MAIN|LOG_PANIC,
 927              "malware acl condition: missing commandline specification for cmdline scanner type.");
 928         return DEFER;
 929       };
 930
 931       /* find scanner output trigger */
 932       if ((cmdline_trigger = string_nextinlist(&av_scanner_work, &sep,
 933                                           cmdline_trigger_buffer,
 934                                           sizeof(cmdline_trigger_buffer))) == NULL) {
 935         /* no trigger regex supplied */
 936         log_write(0, LOG_MAIN|LOG_PANIC,
 937              "malware acl condition: missing trigger specification for cmdline scanner type.");
 938         return DEFER;
 939       };
 940
 941       /* precompile trigger regex */
 942       cmdline_trigger_re = pcre_compile(CS cmdline_trigger, PCRE_COPT, (const char **)&rerror, &roffset, NULL);
 943       if (cmdline_trigger_re == NULL) {
 944         log_write(0, LOG_MAIN|LOG_PANIC,
 945                  "malware acl condition: regular expression error in '%s': %s at offset %d", cmdline_trigger_re, rerror, roffset);
 946         return DEFER;
 947       };
 948
 949       /* find scanner name regex */
 950       if ((cmdline_regex = string_nextinlist(&av_scanner_work, &sep,
 951                                              cmdline_regex_buffer,
 952                                              sizeof(cmdline_regex_buffer))) == NULL) {
 953         /* no name regex supplied */
 954         log_write(0, LOG_MAIN|LOG_PANIC,
 955              "malware acl condition: missing virus name regex specification for cmdline scanner type.");
 956         return DEFER;
 957       };
 958
 959       /* precompile name regex */
 960       cmdline_regex_re = pcre_compile(CS cmdline_regex, PCRE_COPT, (const char **)&rerror, &roffset, NULL);
 961       if (cmdline_regex_re == NULL) {
 962         log_write(0, LOG_MAIN|LOG_PANIC,
 963                  "malware acl condition: regular expression error in '%s': %s at offset %d", cmdline_regex_re, rerror, roffset);
 964         return DEFER;
 965       };
 966
 967       /* prepare scanner call */
 968       (void)string_format(file_name,1024,"%s/scan/%s", spool_directory, message_id);
 969       (void)string_format(commandline,1024, CS cmdline_scanner,file_name);
 970       /* redirect STDERR too */
 971       Ustrcat(commandline," 2>&1");
 972
 973       /* store exims signal handlers */
 974       eximsigchld = signal(SIGCHLD,SIG_DFL);
 975       eximsigpipe = signal(SIGPIPE,SIG_DFL);
 976
 977       scanner_out = popen(CS commandline,"r");
 978       if (scanner_out == NULL) {
 979         log_write(0, LOG_MAIN|LOG_PANIC,
 980                  "malware acl condition: calling cmdline scanner (%s) failed: %s.", commandline, strerror(errno));
 981         signal(SIGCHLD,eximsigchld);
 982         signal(SIGPIPE,eximsigpipe);
 983         return DEFER;
 984       };
 985
 986       (void)string_format(file_name,1024,"%s/scan/%s/%s_scanner_output", spool_directory, message_id, message_id);
 987       scanner_record = modefopen(file_name,"wb",SPOOL_MODE);
 988
 989       if (scanner_record == NULL) {
 990         log_write(0, LOG_MAIN|LOG_PANIC,
 991                  "malware acl condition: opening scanner output file (%s) failed: %s.", file_name, strerror(errno));
 992         pclose(scanner_out);
 993         signal(SIGCHLD,eximsigchld);
 994         signal(SIGPIPE,eximsigpipe);
 995         return DEFER;
 996       };
 997
 998       /* look for trigger while recording output */
 999       while(fgets(CS linebuffer,32767,scanner_out) != NULL) {
1000         if ( Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record) ) {
1001           /* short write */
1002           log_write(0, LOG_MAIN|LOG_PANIC,
1003                  "malware acl condition: short write on scanner output file (%s).", file_name);
1004           pclose(scanner_out);
1005           signal(SIGCHLD,eximsigchld);
1006           signal(SIGPIPE,eximsigpipe);
1007           return DEFER;
1008         };
1009         /* try trigger match */
1010         if (!trigger && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1))
1011           trigger = 1;
1012       };
1013
1014       (void)fclose(scanner_record);
1015       pclose(scanner_out);
1016       signal(SIGCHLD,eximsigchld);
1017       signal(SIGPIPE,eximsigpipe);
1018
1019       if (trigger) {
1020         /* setup default virus name */
1021         Ustrcpy(malware_name_buffer,"unknown");
1022         malware_name = malware_name_buffer;
1023
1024         /* re-open the scanner output file, look for name match */
1025         scanner_record = fopen(CS file_name,"rb");
1026         while(fgets(CS linebuffer,32767,scanner_record) != NULL) {
1027           /* try match */
1028           result = pcre_exec(cmdline_regex_re, NULL, CS linebuffer, Ustrlen(linebuffer), 0, 0, ovector, 30);
1029           if (result >= 2) {
1030             pcre_copy_substring(CS linebuffer, ovector, result, 1, CS malware_name_buffer, 255);
1031           };
1032         };
1033         (void)fclose(scanner_record);
1034       }
1035       else {
1036         /* no virus found */
1037         malware_name = NULL;
1038       };
1039     }
1040     /* ----------------------------------------------------------------------- */
1041
1042
1043     /* "sophie" scanner type ------------------------------------------------- */
1044     else if (strcmpic(scanner_name,US"sophie") == 0) {
1045       uschar *sophie_options;
1046       uschar sophie_options_buffer[1024];
1047       uschar sophie_options_default[] = "/var/run/sophie";
1048       int bread = 0;
1049       struct sockaddr_un server;
1050       int sock;
1051       uschar file_name[1024];
1052       uschar av_buffer[1024];
1053
1054       if ((sophie_options = string_nextinlist(&av_scanner_work, &sep,
1055                                           sophie_options_buffer,
1056                                           sizeof(sophie_options_buffer))) == NULL) {
1057         /* no options supplied, use default options */
1058         sophie_options = sophie_options_default;
1059       };
1060
1061       /* open the sophie socket */
1062       sock = socket(AF_UNIX, SOCK_STREAM, 0);
1063       if (sock < 0) {
1064         log_write(0, LOG_MAIN|LOG_PANIC,
1065              "malware acl condition: can't open UNIX socket.");
1066         return DEFER;
1067       }
1068       server.sun_family = AF_UNIX;
1069       Ustrcpy(server.sun_path, sophie_options);
1070       if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
1071         (void)close(sock);
1072         log_write(0, LOG_MAIN|LOG_PANIC,
1073              "malware acl condition: unable to connect to sophie UNIX socket (%s). errno=%d", sophie_options, errno);
1074         return DEFER;
1075       }
1076
1077       /* pass the scan directory to sophie */
1078       (void)string_format(file_name,1024,"%s/scan/%s", spool_directory, message_id);
1079       if (write(sock, file_name, Ustrlen(file_name)) < 0) {
1080         (void)close(sock);
1081         log_write(0, LOG_MAIN|LOG_PANIC,
1082              "malware acl condition: unable to write to sophie UNIX socket (%s)", sophie_options);
1083         return DEFER;
1084       };
1085
1086       (void)write(sock, "\n", 1);
1087
1088       /* wait for result */
1089       memset(av_buffer, 0, sizeof(av_buffer));
1090       if ((!(bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT)) > 0)) {
1091         (void)close(sock);
1092         log_write(0, LOG_MAIN|LOG_PANIC,
1093              "malware acl condition: unable to read from sophie UNIX socket (%s)", sophie_options);
1094         return DEFER;
1095       };
1096
1097       (void)close(sock);
1098
1099       /* infected ? */
1100       if (av_buffer[0] == '1') {
1101         if (Ustrchr(av_buffer, '\n')) *Ustrchr(av_buffer, '\n') = '\0';
1102         Ustrcpy(malware_name_buffer,&av_buffer[2]);
1103         malware_name = malware_name_buffer;
1104       }
1105       else if (!strncmp(CS av_buffer, "-1", 2)) {
1106         log_write(0, LOG_MAIN|LOG_PANIC,
1107              "malware acl condition: malware acl condition: sophie reported error");
1108         return DEFER;
1109       }
1110       else {
1111         /* all ok, no virus */
1112         malware_name = NULL;
1113       };
1114     }
1115     /* ----------------------------------------------------------------------- */
1116
1117
1118     /* "clamd" scanner type ------------------------------------------------- */
1119     /* This code was contributed by David Saez */
1120     else if (strcmpic(scanner_name,US"clamd") == 0) {
1121       uschar *clamd_options;
1122       uschar clamd_options_buffer[1024];
1123       uschar clamd_options_default[] = "/tmp/clamd";
1124       uschar *p,*vname;
1125       struct sockaddr_un server;
1126       int sock,bread=0;
1127       unsigned int port;
1128       uschar file_name[1024];
1129       uschar av_buffer[1024];
1130       uschar hostname[256];
1131       struct hostent *he;
1132       struct in_addr in;
1133       uschar *clamd_options2;
1134       uschar clamd_options2_buffer[1024];
1135       uschar clamd_options2_default[] = "";
1136       uschar av_buffer2[1024];
1137       uschar *clamav_fbuf;
1138       uschar scanrequest[1024];
1139       int sockData, clam_fd, result;
1140       unsigned int fsize;
1141
1142       if ((clamd_options = string_nextinlist(&av_scanner_work, &sep,
1143                                              clamd_options_buffer,
1144                                              sizeof(clamd_options_buffer))) == NULL) {
1145         /* no options supplied, use default options */
1146         clamd_options = clamd_options_default;
1147       }
1148       if ((clamd_options2 = string_nextinlist(&av_scanner_work, &sep,
1149                                              clamd_options2_buffer,
1150                                              sizeof(clamd_options2_buffer))) == NULL) {
1151         clamd_options2 = clamd_options2_default;
1152       }
1153
1154       /* socket does not start with '/' -> network socket */
1155       if (*clamd_options != '/') {
1156
1157         /* extract host and port part */
1158         if( sscanf(CS clamd_options, "%s %u", hostname, &port) != 2 ) {
1159           log_write(0, LOG_MAIN|LOG_PANIC,
1160                     "malware acl condition: clamd: invalid socket '%s'", clamd_options);
1161           return DEFER;
1162         };
1163
1164         /* Lookup the host */
1165         if((he = gethostbyname(CS hostname)) == 0) {
1166           log_write(0, LOG_MAIN|LOG_PANIC,
1167                     "malware acl condition: clamd: failed to lookup host '%s'", hostname);
1168           return DEFER;
1169         }
1170
1171         in = *(struct in_addr *) he->h_addr_list[0];
1172
1173         /* Open the ClamAV Socket */
1174         if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) {
1175           log_write(0, LOG_MAIN|LOG_PANIC,
1176                     "malware acl condition: clamd: unable to acquire socket (%s)",
1177                     strerror(errno));
1178           return DEFER;
1179         }
1180
1181         if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) {
1182           (void)close(sock);
1183           log_write(0, LOG_MAIN|LOG_PANIC,
1184                     "malware acl condition: clamd: connection to %s, port %u failed (%s)",
1185                     inet_ntoa(in), port, strerror(errno));
1186           return DEFER;
1187         }
1188
1189         if (strcmpic(clamd_options2,US"local") == 0) {
1190
1191       /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */
1192
1193           (void)string_format(file_name,1024,"SCAN %s/scan/%s\n", spool_directory, message_id);
1194
1195           if (send(sock, file_name, Ustrlen(file_name), 0) < 0) {
1196             (void)close(sock);
1197             log_write(0, LOG_MAIN|LOG_PANIC,"malware acl condition: clamd: unable to write to socket (%s)",
1198                   strerror(errno));
1199             return DEFER;
1200           }
1201         } else {
1202
1203       /* Pass the string to ClamAV (7 = "STREAM\n") */
1204
1205           if (send(sock, "STREAM\n", 7, 0) < 0) {
1206             (void)close(sock);
1207             log_write(0, LOG_MAIN|LOG_PANIC,"malware acl condition: clamd: unable to write to socket (%s)",
1208                   strerror(errno));
1209             return DEFER;
1210           }
1211           memset(av_buffer2, 0, sizeof(av_buffer2));
1212           bread = ip_recv(sock, av_buffer2, sizeof(av_buffer2), MALWARE_TIMEOUT);
1213
1214           if (bread < 0) {
1215             log_write(0, LOG_MAIN|LOG_PANIC,
1216                   "malware acl condition: clamd: unable to read PORT from socket (%s)",
1217                   strerror(errno));
1218             return DEFER;
1219           }
1220
1221           if (bread == sizeof(av_buffer)) {
1222             log_write(0, LOG_MAIN|LOG_PANIC,
1223                   "malware acl condition: clamd: buffer too small");
1224             return DEFER;
1225           }
1226
1227           if (!(*av_buffer2)) {
1228             log_write(0, LOG_MAIN|LOG_PANIC,
1229                   "malware acl condition: clamd: ClamAV returned null");
1230             return DEFER;
1231           }
1232
1233           av_buffer2[bread] = '\0';
1234           if( sscanf(CS av_buffer2, "PORT %u\n", &port) != 1 ) {
1235             log_write(0, LOG_MAIN|LOG_PANIC,
1236                     "malware acl condition: clamd: Expected port information from clamd, got '%s'", av_buffer2);
1237             return DEFER;
1238           };
1239
1240           if ( (sockData = ip_socket(SOCK_STREAM, AF_INET)) < 0) {
1241             log_write(0, LOG_MAIN|LOG_PANIC,
1242                     "malware acl condition: clamd: unable to acquire socket (%s)",
1243                     strerror(errno));
1244             return DEFER;
1245           }
1246
1247           if (ip_connect(sockData, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) {
1248             (void)close(sockData);
1249             log_write(0, LOG_MAIN|LOG_PANIC,
1250                     "malware acl condition: clamd: connection to %s, port %u failed (%s)",
1251                     inet_ntoa(in), port, strerror(errno));
1252             return DEFER;
1253           }
1254
1255       (void)string_format(scanrequest, 1024,CS"%s/scan/%s/%s.eml",
1256       spool_directory, message_id, message_id);
1257
1258     /* calc file size */
1259     clam_fd = open(CS scanrequest, O_RDONLY);
1260     if (clam_fd == -1) {
1261       log_write(0, LOG_MAIN|LOG_PANIC,
1262         "malware acl condition: clamd: can't open spool file %s: %s",
1263         scanrequest, strerror(errno));
1264       return DEFER;
1265     }
1266     fsize = lseek(clam_fd, 0, SEEK_END);
1267     if (fsize == -1) {
1268       log_write(0, LOG_MAIN|LOG_PANIC,
1269         "malware acl condition: clamd: can't seek spool file %s: %s",
1270         scanrequest, strerror(errno));
1271       return DEFER;
1272     }
1273     lseek(clam_fd, 0, SEEK_SET);
1274
1275     clamav_fbuf = (uschar *) malloc (fsize);
1276     if (!clamav_fbuf) {
1277       (void)close(sockData);
1278       (void)close(clam_fd);
1279       log_write(0, LOG_MAIN|LOG_PANIC,
1280         "malware acl condition: clamd: unable to allocate memory %u for file (%s)",
1281         fsize, scanrequest);
1282       return DEFER;
1283     }
1284
1285     result = read (clam_fd, clamav_fbuf, fsize);
1286     if (result == -1) {
1287       (void)close(sockData);
1288       (void)close(clam_fd);
1289       free(clamav_fbuf);
1290       log_write(0, LOG_MAIN|LOG_PANIC,
1291         "malware acl condition: clamd: can't read spool file %s: %s",
1292         scanrequest, strerror(errno));
1293       return DEFER;
1294     }
1295     (void)close(clam_fd);
1296
1297     /* send file body to socket */
1298     if (send(sockData, clamav_fbuf, fsize, 0) < 0) {
1299       (void)close(sockData);
1300       free(clamav_fbuf);
1301       log_write(0, LOG_MAIN|LOG_PANIC,
1302         "malware acl condition: clamd: unable to send file body to socket (%s:%u)", hostname, port);
1303       return DEFER;
1304     }
1305     free(clamav_fbuf);
1306           (void)close(sockData);
1307         }
1308       }
1309       else {
1310         /* open the local socket */
1311         if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
1312           log_write(0, LOG_MAIN|LOG_PANIC,
1313                     "malware acl condition: clamd: unable to acquire socket (%s)",
1314                     strerror(errno));
1315           return DEFER;
1316         }
1317
1318         server.sun_family = AF_UNIX;
1319         Ustrcpy(server.sun_path, clamd_options);
1320
1321         if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
1322           (void)close(sock);
1323           log_write(0, LOG_MAIN|LOG_PANIC,
1324                     "malware acl condition: clamd: unable to connect to UNIX socket %s (%s)",
1325                     clamd_options, strerror(errno) );
1326           return DEFER;
1327         }
1328       }
1329
1330       /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */
1331
1332       (void)string_format(file_name,1024,"SCAN %s/scan/%s\n", spool_directory, message_id);
1333
1334       if (send(sock, file_name, Ustrlen(file_name), 0) < 0) {
1335         (void)close(sock);
1336         log_write(0, LOG_MAIN|LOG_PANIC,"malware acl condition: clamd: unable to write to socket (%s)",
1337                   strerror(errno));
1338         return DEFER;
1339       }
1340
1341       /*
1342         We're done sending, close socket for writing.
1343
1344         One user reported that clamd 0.70 does not like this any more ...
1345
1346       */
1347
1348       /* shutdown(sock, SHUT_WR); */
1349
1350       /* Read the result */
1351       memset(av_buffer, 0, sizeof(av_buffer));
1352       bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
1353       (void)close(sock);
1354
1355       if (!(bread  > 0)) {
1356         log_write(0, LOG_MAIN|LOG_PANIC,
1357                   "malware acl condition: clamd: unable to read from socket (%s)",
1358                   strerror(errno));
1359         return DEFER;
1360       }
1361
1362       if (bread == sizeof(av_buffer)) {
1363         log_write(0, LOG_MAIN|LOG_PANIC,
1364                   "malware acl condition: clamd: buffer too small");
1365         return DEFER;
1366       }
1367
1368       /* Check the result. ClamAV Returns
1369          infected: -> "<filename>: <virusname> FOUND"
1370          not-infected: -> "<filename>: OK"
1371     error: -> "<filename>: <errcode> ERROR */
1372
1373       if (!(*av_buffer)) {
1374         log_write(0, LOG_MAIN|LOG_PANIC,
1375                   "malware acl condition: clamd: ClamAV returned null");
1376         return DEFER;
1377       }
1378
1379       /* strip newline at the end */
1380       p = av_buffer + Ustrlen(av_buffer) - 1;
1381       if( *p == '\n' ) *p = '\0';
1382
1383       /* colon in returned output? */
1384       if((p = Ustrrchr(av_buffer,':')) == NULL) {
1385         log_write(0, LOG_MAIN|LOG_PANIC,
1386                   "malware acl condition: clamd: ClamAV returned malformed result: %s",
1387                   av_buffer);
1388         return DEFER;
1389       }
1390
1391       /* strip filename */
1392       ++p;
1393       while (*p == ' ') ++p;
1394       vname = p;
1395       if ((p = Ustrstr(vname, "FOUND"))!=NULL) {
1396            *p=0;
1397            for (--p;p>vname && *p<=32;p--) *p=0;
1398            for (;*vname==32;vname++);
1399            Ustrcpy(malware_name_buffer,vname);
1400            malware_name = malware_name_buffer;
1401       }
1402       else {
1403            if (Ustrstr(vname, "ERROR")!=NULL) {
1404               /* ClamAV reports ERROR
1405               Find line start */
1406               for (;*vname!='\n' && vname>av_buffer; vname--);
1407               if (*vname=='\n') vname++;
1408
1409               log_write(0, LOG_MAIN|LOG_PANIC,
1410                      "malware acl condition: clamd: ClamAV returned %s",vname);
1411               return DEFER;
1412            }
1413            else {
1414               /* Everything should be OK */
1415               malware_name = NULL;
1416            }
1417       }
1418     }
1419     /* ----------------------------------------------------------------------- */
1420
1421
1422     /* "mksd" scanner type --------------------------------------------------- */
1423     else if (strcmpic(scanner_name,US"mksd") == 0) {
1424       uschar *mksd_options;
1425       char *mksd_options_end;
1426       uschar mksd_options_buffer[32];
1427       int mksd_maxproc = 1;  /* default, if no option supplied */
1428       struct sockaddr_un server;
1429       int sock;
1430       int retval;
1431
1432       if ((mksd_options = string_nextinlist(&av_scanner_work, &sep,
1433                                             mksd_options_buffer,
1434                                             sizeof(mksd_options_buffer))) != NULL) {
1435         mksd_maxproc = (int) strtol(CS mksd_options, &mksd_options_end, 10);
1436         if ((*mksd_options == '\0') || (*mksd_options_end != '\0') ||
1437       (mksd_maxproc < 1) || (mksd_maxproc > 32)) {
1438           log_write(0, LOG_MAIN|LOG_PANIC,
1439                     "malware acl condition: mksd: invalid option '%s'", mksd_options);
1440           return DEFER;
1441         }
1442       }
1443
1444       /* open the mksd socket */
1445       sock = socket(AF_UNIX, SOCK_STREAM, 0);
1446       if (sock < 0) {
1447         log_write(0, LOG_MAIN|LOG_PANIC,
1448              "malware acl condition: can't open UNIX socket.");
1449         return DEFER;
1450       }
1451       server.sun_family = AF_UNIX;
1452       Ustrcpy(server.sun_path, "/var/run/mksd/socket");
1453       if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
1454         (void)close(sock);
1455         log_write(0, LOG_MAIN|LOG_PANIC,
1456              "malware acl condition: unable to connect to mksd UNIX socket (/var/run/mksd/socket). errno=%d", errno);
1457         return DEFER;
1458       }
1459
1460       malware_name = NULL;
1461
1462       retval = mksd_scan_packed(sock);
1463
1464       if (retval != OK)
1465         return retval;
1466     }
1467     /* ----------------------------------------------------------------------- */
1468
1469     /* "unknown" scanner type ------------------------------------------------- */
1470     else {
1471       log_write(0, LOG_MAIN|LOG_PANIC,
1472              "malware condition: unknown scanner type '%s'", scanner_name);
1473       return DEFER;
1474     };
1475     /* ----------------------------------------------------------------------- */
1476
1477     /* set "been here, done that" marker */
1478     malware_ok = 1;
1479   };
1480
1481   /* match virus name against pattern (caseless ------->----------v) */
1482   if ( (malware_name != NULL) &&
1483        (regex_match_and_setup(re, malware_name, 0, -1)) ) {
1484     return OK;
1485   }
1486   else {
1487     return FAIL;
1488   };
1489 }
1490
1491
1492 /* simple wrapper for reading lines from sockets */
1493 int recv_line(int sock, uschar *buffer, int size) {
1494   uschar *p = buffer;
1495
1496   memset(buffer,0,size);
1497   /* read until \n */
1498   while(recv(sock,p,1,0) > -1) {
1499     if ((p-buffer) > (size-2)) break;
1500     if (*p == '\n') break;
1501     if (*p != '\r') p++;
1502   };
1503   *p = '\0';
1504
1505   return (p-buffer);
1506 }
1507
1508
1509 /* ============= private routines for the "mksd" scanner type ============== */
1510
1511 #include <sys/uio.h>
1512
1513 int mksd_writev (int sock, struct iovec *iov, int iovcnt)
1514 {
1515   int i;
1516
1517   for (;;) {
1518     do
1519       i = writev (sock, iov, iovcnt);
1520     while ((i < 0) && (errno == EINTR));
1521     if (i <= 0) {
1522       close (sock);
1523       log_write(0, LOG_MAIN|LOG_PANIC,
1524                 "malware acl condition: unable to write to mksd UNIX socket (/var/run/mksd/socket)");
1525       return -1;
1526     }
1527
1528     for (;;)
1529       if (i >= iov->iov_len) {
1530         if (--iovcnt == 0)
1531           return 0;
1532         i -= iov->iov_len;
1533         iov++;
1534       } else {
1535         iov->iov_len -= i;
1536         iov->iov_base = CS iov->iov_base + i;
1537         break;
1538       }
1539   }
1540 }
1541
1542 int mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size)
1543 {
1544   int offset = 0;
1545   int i;
1546
1547   do {
1548     if ((i = recv (sock, av_buffer+offset, av_buffer_size-offset, 0)) <= 0) {
1549       close (sock);
1550       log_write(0, LOG_MAIN|LOG_PANIC,
1551                 "malware acl condition: unable to read from mksd UNIX socket (/var/run/mksd/socket)");
1552       return -1;
1553     }
1554
1555     offset += i;
1556     /* offset == av_buffer_size -> buffer full */
1557     if (offset == av_buffer_size) {
1558       close (sock);
1559       log_write(0, LOG_MAIN|LOG_PANIC,
1560                 "malware acl condition: malformed reply received from mksd");
1561       return -1;
1562     }
1563   } while (av_buffer[offset-1] != '\n');
1564
1565   av_buffer[offset] = '\0';
1566   return offset;
1567 }
1568
1569 int mksd_parse_line (char *line)
1570 {
1571   char *p;
1572
1573   switch (*line) {
1574     case 'O':
1575       /* OK */
1576       return OK;
1577     case 'E':
1578     case 'A':
1579       /* ERR */
1580       if ((p = strchr (line, '\n')) != NULL)
1581         (*p) = '\0';
1582       log_write(0, LOG_MAIN|LOG_PANIC,
1583                 "malware acl condition: mksd scanner failed: %s", line);
1584       return DEFER;
1585     default:
1586       /* VIR */
1587       if ((p = strchr (line, '\n')) != NULL) {
1588         (*p) = '\0';
1589         if (((p-line) > 5) && ((p-line) < sizeof (malware_name_buffer)) && (line[3] == ' '))
1590           if (((p = strchr (line+4, ' ')) != NULL) && ((p-line) > 4)) {
1591             (*p) = '\0';
1592             Ustrcpy (malware_name_buffer, line+4);
1593       malware_name = malware_name_buffer;
1594             return OK;
1595           }
1596       }
1597       log_write(0, LOG_MAIN|LOG_PANIC,
1598                 "malware acl condition: malformed reply received from mksd: %s", line);
1599       return DEFER;
1600   }
1601 }
1602
1603 int mksd_scan_packed (int sock)
1604 {
1605   struct iovec iov[7];
1606   char *cmd = "MSQ/scan/.eml\n";
1607   uschar av_buffer[1024];
1608
1609   iov[0].iov_base = cmd;
1610   iov[0].iov_len = 3;
1611   iov[1].iov_base = CS spool_directory;
1612   iov[1].iov_len = Ustrlen (spool_directory);
1613   iov[2].iov_base = cmd + 3;
1614   iov[2].iov_len = 6;
1615   iov[3].iov_base = iov[5].iov_base = CS message_id;
1616   iov[3].iov_len = iov[5].iov_len = Ustrlen (message_id);
1617   iov[4].iov_base = cmd + 3;
1618   iov[4].iov_len = 1;
1619   iov[6].iov_base = cmd + 9;
1620   iov[6].iov_len = 5;
1621
1622   if (mksd_writev (sock, iov, 7) < 0)
1623     return DEFER;
1624
1625   if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer)) < 0)
1626     return DEFER;
1627
1628   close (sock);
1629
1630   return mksd_parse_line (CS av_buffer);
1631 }
1632
1633 #endif