src/plugins/spamassassin/spamassassin.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2006 Hiroyuki Yamamoto and the Sylpheed-Claws Team
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #  include "config.h"
  22 #endif
  23
  24 #include "defs.h"
  25
  26 #include <sys/types.h>
  27 #include <sys/wait.h>
  28
  29 #include <glib.h>
  30 #include <glib/gi18n.h>
  31
  32 #if HAVE_LOCALE_H
  33 #  include <locale.h>
  34 #endif
  35
  36 #include "common/sylpheed.h"
  37 #include "common/version.h"
  38 #include "plugin.h"
  39 #include "common/utils.h"
  40 #include "hooks.h"
  41 #include "procmsg.h"
  42 #include "folder.h"
  43 #include "prefs.h"
  44 #include "prefs_gtk.h"
  45
  46 #include "libspamc.h"
  47 #include "spamassassin.h"
  48 #include "inc.h"
  49 #include "log.h"
  50 #include "prefs_common.h"
  51
  52 #ifdef HAVE_SYSEXITS_H
  53 #include <sysexits.h>
  54 #endif
  55 #ifdef HAVE_ERRNO_H
  56 #include <errno.h>
  57 #endif
  58 #ifdef HAVE_SYS_ERRNO_H
  59 #include <sys/errno.h>
  60 #endif
  61 #ifdef HAVE_TIME_H
  62 #include <time.h>
  63 #endif
  64 #ifdef HAVE_SYS_TIME_H
  65 #include <sys/time.h>
  66 #endif
  67 #ifdef HAVE_SIGNAL_H
  68 #include <signal.h>
  69 #endif
  70 #ifdef HAVE_PWD_H
  71 #include <pwd.h>
  72 #endif
  73
  74 enum {
  75     CHILD_RUNNING = 1 << 0,
  76     TIMEOUT_RUNNING = 1 << 1,
  77 };
  78
  79 static guint hook_id = -1;
  80 static int flags = SPAMC_RAW_MODE | SPAMC_SAFE_FALLBACK | SPAMC_CHECK_ONLY;
  81 static MessageCallback message_callback;
  82
  83 static SpamAssassinConfig config;
  84
  85 static PrefParam param[] = {
  86         {"enable", "FALSE", &config.enable, P_BOOL,
  87         NULL, NULL, NULL},
  88         {"transport", "0", &config.transport, P_INT,
  89          NULL, NULL, NULL},
  90         {"hostname", "localhost", &config.hostname, P_STRING,
  91          NULL, NULL, NULL},
  92         {"port", "783", &config.port, P_INT,
  93          NULL, NULL, NULL},
  94         {"socket", "", &config.socket, P_STRING,
  95          NULL, NULL, NULL},
  96         {"process_emails", "TRUE", &config.process_emails, P_BOOL,
  97          NULL, NULL, NULL},
  98         {"receive_spam", "TRUE", &config.receive_spam, P_BOOL,
  99          NULL, NULL, NULL},
 100         {"save_folder", NULL, &config.save_folder, P_STRING,
 101          NULL, NULL, NULL},
 102         {"max_size", "250", &config.max_size, P_INT,
 103          NULL, NULL, NULL},
 104         {"timeout", "30", &config.timeout, P_INT,
 105          NULL, NULL, NULL},
 106         {"username", "", &config.username, P_STRING,
 107          NULL, NULL, NULL},
 108
 109         {NULL, NULL, NULL, P_OTHER, NULL, NULL, NULL}
 110 };
 111
 112 gboolean timeout_func(gpointer data)
 113 {
 114         gint *running = (gint *) data;
 115
 116         if (*running & CHILD_RUNNING)
 117                 return TRUE;
 118
 119         *running &= ~TIMEOUT_RUNNING;
 120         return FALSE;
 121 }
 122
 123 static gboolean msg_is_spam(FILE *fp)
 124 {
 125         struct transport trans;
 126         struct message m;
 127         gboolean is_spam = FALSE;
 128
 129         if (!config.enable)
 130                 return FALSE;
 131
 132         transport_init(&trans);
 133         switch (config.transport) {
 134         case SPAMASSASSIN_TRANSPORT_LOCALHOST:
 135                 trans.type = TRANSPORT_LOCALHOST;
 136                 trans.port = config.port;
 137                 break;
 138         case SPAMASSASSIN_TRANSPORT_TCP:
 139                 trans.type = TRANSPORT_TCP;
 140                 trans.hostname = config.hostname;
 141                 trans.port = config.port;
 142                 break;
 143         case SPAMASSASSIN_TRANSPORT_UNIX:
 144                 trans.type = TRANSPORT_UNIX;
 145                 trans.socketpath = config.socket;
 146                 break;
 147         default:
 148                 return FALSE;
 149         }
 150
 151         if (transport_setup(&trans, flags) != EX_OK) {
 152                 log_error("Spamassassin plugin couldn't connect to spamd.\n");
 153                 debug_print("failed to setup transport\n");
 154                 return FALSE;
 155         }
 156
 157         m.type = MESSAGE_NONE;
 158         m.max_len = config.max_size * 1024;
 159         m.timeout = config.timeout;
 160
 161         if (message_read(fileno(fp), flags, &m) != EX_OK) {
 162                 debug_print("failed to read message\n");
 163                 message_cleanup(&m);
 164                 return FALSE;
 165         }
 166
 167         if (message_filter(&trans, config.username, flags, &m) != EX_OK) {
 168                 debug_print("filtering the message failed\n");
 169                 message_cleanup(&m);
 170                 return FALSE;
 171         }
 172
 173         if (m.is_spam == EX_ISSPAM)
 174                 is_spam = TRUE;
 175
 176         message_cleanup(&m);
 177
 178         return is_spam;
 179 }
 180
 181 static gboolean mail_filtering_hook(gpointer source, gpointer data)
 182 {
 183         MailFilteringData *mail_filtering_data = (MailFilteringData *) source;
 184         MsgInfo *msginfo = mail_filtering_data->msginfo;
 185         gboolean is_spam = FALSE;
 186         FILE *fp = NULL;
 187         int pid = 0;
 188         int status;
 189
 190         /* SPAMASSASSIN_DISABLED : keep test for compatibility purpose */
 191         if (!config.enable || config.transport == SPAMASSASSIN_DISABLED) {
 192                 log_error("Spamassassin plugin is disabled by its preferences.\n");
 193                 return FALSE;
 194         }
 195         debug_print("Filtering message %d\n", msginfo->msgnum);
 196         if (message_callback != NULL)
 197                 message_callback(_("SpamAssassin: filtering message..."));
 198
 199         if ((fp = procmsg_open_message(msginfo)) == NULL) {
 200                 debug_print("failed to open message file\n");
 201                 return FALSE;
 202         }
 203
 204         pid = fork();
 205         if (pid == 0) {
 206                 _exit(msg_is_spam(fp) ? 1 : 0);
 207         } else {
 208                 gint running = 0;
 209
 210                 running |= CHILD_RUNNING;
 211
 212                 g_timeout_add(50, timeout_func, &running);
 213                 running |= TIMEOUT_RUNNING;
 214
 215                 while(running & CHILD_RUNNING) {
 216                         int ret;
 217
 218                         ret = waitpid(pid, &status, WNOHANG);
 219                         if (ret == pid) {
 220                                 if (WIFEXITED(status)) {
 221                                         running &= ~CHILD_RUNNING;
 222                                         is_spam = WEXITSTATUS(status) == 1 ? TRUE : FALSE;
 223                                 }
 224                         } if (ret < 0) {
 225                                 running &= ~CHILD_RUNNING;
 226                         } /* ret == 0 continue */
 227
 228                         g_main_iteration(TRUE);
 229                 }
 230
 231                 while (running & TIMEOUT_RUNNING)
 232                         g_main_iteration(TRUE);
 233         }
 234
 235         fclose(fp);
 236
 237         if (is_spam) {
 238                 debug_print("message is spam\n");
 239                 procmsg_msginfo_set_flags(msginfo, MSG_SPAM, 0);
 240                 if (config.receive_spam) {
 241                         FolderItem *save_folder;
 242
 243                         if ((!config.save_folder) ||
 244                             (config.save_folder[0] == '\0') ||
 245                             ((save_folder = folder_find_item_from_identifier(config.save_folder)) == NULL))
 246                                 save_folder = folder_get_default_trash();
 247
 248                         procmsg_msginfo_unset_flags(msginfo, ~0, 0);
 249                         procmsg_msginfo_set_flags(msginfo, MSG_SPAM, 0);
 250                         folder_item_move_msg(save_folder, msginfo);
 251                 } else {
 252                         folder_item_remove_msg(msginfo->folder, msginfo->msgnum);
 253                 }
 254
 255                 return TRUE;
 256         } else {
 257                 debug_print("message is ham\n");
 258                 procmsg_msginfo_unset_flags(msginfo, MSG_SPAM, 0);
 259         }
 260         return FALSE;
 261 }
 262
 263 SpamAssassinConfig *spamassassin_get_config(void)
 264 {
 265         return &config;
 266 }
 267
 268 gchar* spamassassin_create_tmp_spamc_wrapper(gboolean spam)
 269 {
 270         gchar *contents;
 271         gchar *fname = get_tmp_file();
 272
 273         if (fname != NULL) {
 274                 contents = g_strdup_printf(
 275                                                 "spamc -d %s -p %u -u %s -t %u -s %u -L %s<\"$*\";exit $?",
 276                                                 config.hostname, config.port,
 277                                                 config.username, config.timeout,
 278                                                 config.max_size * 1024, spam?"spam":"ham");
 279                 if (str_write_to_file(contents, fname) < 0) {
 280                         g_free(fname);
 281                         fname = NULL;
 282                 }
 283                 g_free(contents);
 284         }
 285         /* returned pointer must be free'ed by caller */
 286         return fname;
 287 }
 288
 289 int spamassassin_learn(MsgInfo *msginfo, GSList *msglist, gboolean spam)
 290 {
 291         gchar *cmd = NULL;
 292         gchar *file = NULL;
 293         const gchar *shell = g_getenv("SHELL");
 294         gchar *spamc_wrapper = NULL;
 295
 296         if (msginfo == NULL && msglist == NULL) {
 297                 return -1;
 298         }
 299
 300         if (config.transport == SPAMASSASSIN_TRANSPORT_TCP
 301         &&  prefs_common.work_offline
 302         &&  !inc_offline_should_override(
 303                 _("Sylpheed-Claws needs network access in order "
 304                   "to feed this mail(s) to the remote learner."))) {
 305                 return -1;
 306         }
 307
 308         if (msginfo) {
 309                 file = procmsg_get_message_file(msginfo);
 310                 if (file == NULL) {
 311                         return -1;
 312                 }
 313                 if (config.transport == SPAMASSASSIN_TRANSPORT_TCP) {
 314                         spamc_wrapper = spamassassin_create_tmp_spamc_wrapper(spam);
 315                         if (spamc_wrapper != NULL) {
 316                                 cmd = g_strconcat(shell?shell:"sh", " ",
 317                                                                 spamc_wrapper, " ", file, NULL);
 318                         }
 319                 } else {
 320                         cmd = g_strdup_printf("sa-learn -u %s %s %s %s",
 321                                                         config.username,
 322                                                         prefs_common.work_offline?"-L":"",
 323                                                         spam?"--spam":"--ham", file);
 324                 }
 325         }
 326         if (msglist) {
 327                 GSList *cur = msglist;
 328                 MsgInfo *info;
 329
 330                 if (config.transport == SPAMASSASSIN_TRANSPORT_TCP) {
 331                         /* execute n-times the spamc command */
 332                         for (; cur; cur = cur->next) {
 333                                 info = (MsgInfo *)cur->data;
 334                                 gchar *tmpcmd = NULL;
 335                                 gchar *tmpfile = get_tmp_file();
 336
 337                                 if (spamc_wrapper == NULL) {
 338                                         spamc_wrapper = spamassassin_create_tmp_spamc_wrapper(spam);
 339                                 }
 340
 341                                 if (spamc_wrapper && tmpfile &&
 342                                 copy_file(procmsg_get_message_file(info), tmpfile, TRUE) == 0) {
 343                                         tmpcmd = g_strconcat(shell?shell:"sh", " ", spamc_wrapper, " ",
 344                                                                                 tmpfile, NULL);
 345                                         debug_print("%s\n", tmpcmd);
 346                                         execute_command_line(tmpcmd, FALSE);
 347                                         g_free(tmpcmd);
 348                                 }
 349                                 if (tmpfile != NULL) {
 350                                         g_free(tmpfile);
 351                                 }
 352                         }
 353                         if (spamc_wrapper != NULL) {
 354                                 g_free(spamc_wrapper);
 355                         }
 356                         return 0;
 357                 } else {
 358                         cmd = g_strdup_printf("sa-learn -u %s %s %s",
 359                                         config.username,
 360                                         prefs_common.work_offline?"-L":"",
 361                                         spam?"--spam":"--ham");
 362
 363                         /* concatenate all message tmpfiles to the sa-learn command-line */
 364                         for (; cur; cur = cur->next) {
 365                                 info = (MsgInfo *)cur->data;
 366                                 gchar *tmpcmd = NULL;
 367                                 gchar *tmpfile = get_tmp_file();
 368
 369                                 if (tmpfile &&
 370                                 copy_file(procmsg_get_message_file(info), tmpfile, TRUE) == 0) {
 371                                         tmpcmd = g_strconcat(cmd, " ", tmpfile, NULL);
 372                                         g_free(cmd);
 373                                         cmd = tmpcmd;
 374                                 }
 375                                 if (tmpfile != NULL) {
 376                                         g_free(tmpfile);
 377                                 }
 378                         }
 379                 }
 380         }
 381         if (cmd == NULL) {
 382                 return -1;
 383         }
 384         debug_print("%s\n", cmd);
 385         /* only run sync calls to sa-learn/spamc to prevent system lockdown */
 386         execute_command_line(cmd, FALSE);
 387         g_free(cmd);
 388         if (spamc_wrapper != NULL) {
 389                 g_free(spamc_wrapper);
 390         }
 391         return 0;
 392 }
 393
 394 void spamassassin_save_config(void)
 395 {
 396         PrefFile *pfile;
 397         gchar *rcpath;
 398
 399         debug_print("Saving SpamAssassin Page\n");
 400
 401         rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S, COMMON_RC, NULL);
 402         pfile = prefs_write_open(rcpath);
 403         g_free(rcpath);
 404         if (!pfile || (prefs_set_block_label(pfile, "SpamAssassin") < 0))
 405                 return;
 406
 407         if (prefs_write_param(param, pfile->fp) < 0) {
 408                 g_warning("Failed to write SpamAssassin configuration to file\n");
 409                 prefs_file_close_revert(pfile);
 410                 return;
 411         }
 412         fprintf(pfile->fp, "\n");
 413
 414         prefs_file_close(pfile);
 415 }
 416
 417 gboolean spamassassin_check_username(void)
 418 {
 419         if (config.username == NULL || config.username[0] == '\0') {
 420                 config.username = (gchar*)g_get_user_name();
 421                 if (config.username == NULL) {
 422                         if (hook_id != -1) {
 423                                 spamassassin_unregister_hook();
 424                         }
 425                         procmsg_unregister_spam_learner(spamassassin_learn);
 426                         procmsg_spam_set_folder(NULL);
 427                         return FALSE;
 428                 }
 429         }
 430         return TRUE;
 431 }
 432
 433 void spamassassin_set_message_callback(MessageCallback callback)
 434 {
 435         message_callback = callback;
 436 }
 437
 438 gint plugin_init(gchar **error)
 439 {
 440         gchar *rcpath;
 441
 442         hook_id = -1;
 443
 444         if ((sylpheed_get_version() > VERSION_NUMERIC)) {
 445                 *error = g_strdup("Your version of Sylpheed-Claws is newer than the version the SpamAssassin plugin was built with");
 446                 return -1;
 447         }
 448
 449         if ((sylpheed_get_version() < MAKE_NUMERIC_VERSION(0, 9, 3, 86))) {
 450                 *error = g_strdup("Your version of Sylpheed-Claws is too old for the SpamAssassin plugin");
 451                 return -1;
 452         }
 453
 454         prefs_set_default(param);
 455         rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S, COMMON_RC, NULL);
 456         prefs_read_config(param, "SpamAssassin", rcpath, NULL);
 457         g_free(rcpath);
 458         if (!spamassassin_check_username()) {
 459                 *error = g_strdup("Failed to get username");
 460                 return -1;
 461         }
 462         spamassassin_gtk_init();
 463
 464         debug_print("Spamassassin plugin loaded\n");
 465
 466         if (config.process_emails) {
 467                 spamassassin_register_hook();
 468         }
 469
 470         if (!config.enable || config.transport == SPAMASSASSIN_DISABLED) {
 471                 log_error("Spamassassin plugin is loaded but disabled by its preferences.\n");
 472         }
 473         else {
 474                 if (config.transport == SPAMASSASSIN_TRANSPORT_TCP)
 475                         debug_print("Enabling learner with a remote spamassassin server requires spamc/spamd 3.1.x\n");
 476                 procmsg_register_spam_learner(spamassassin_learn);
 477                 procmsg_spam_set_folder(config.save_folder);
 478         }
 479
 480         return 0;
 481
 482 }
 483
 484 void plugin_done(void)
 485 {
 486         if (hook_id != -1) {
 487                 spamassassin_unregister_hook();
 488         }
 489         g_free(config.hostname);
 490         g_free(config.save_folder);
 491         spamassassin_gtk_done();
 492         procmsg_unregister_spam_learner(spamassassin_learn);
 493         procmsg_spam_set_folder(NULL);
 494         debug_print("Spamassassin plugin unloaded\n");
 495 }
 496
 497 const gchar *plugin_name(void)
 498 {
 499         return _("SpamAssassin");
 500 }
 501
 502 const gchar *plugin_desc(void)
 503 {
 504         return _("This plugin checks all messages that are received from an "
 505                  "IMAP, LOCAL or POP account for spam using a SpamAssassin "
 506                  "server. You will need a SpamAssassin Server (spamd) running "
 507                  "somewhere.\n"
 508                  "\n"
 509                  "When a message is identified as spam it can be deleted or "
 510                  "saved into a special folder.\n"
 511                  "\n");
 512 }
 513
 514 const gchar *plugin_type(void)
 515 {
 516         return "GTK2";
 517 }
 518
 519 const gchar *plugin_licence(void)
 520 {
 521         return "GPL";
 522 }
 523
 524 const gchar *plugin_version(void)
 525 {
 526         return VERSION;
 527 }
 528
 529 void spamassassin_register_hook(void)
 530 {
 531         hook_id = hooks_register_hook(MAIL_FILTERING_HOOKLIST, mail_filtering_hook, NULL);
 532         if (hook_id == -1) {
 533                 g_warning("Failed to register mail filtering hook");
 534                 config.process_emails = FALSE;
 535         }
 536 }
 537
 538 void spamassassin_unregister_hook(void)
 539 {
 540         if (hook_id != -1) {
 541                 hooks_unregister_hook(MAIL_FILTERING_HOOKLIST, hook_id);
 542         }
 543 }