Mercurial > dnsbl
annotate src/dnsbl.cpp @ 41:d95af8129dfa
updates for 3.2, changing file layout, add queueid to messages
| author | carl |
|---|---|
| date | Mon, 05 Jul 2004 10:52:02 -0700 |
| parents | dc3d8d1aa2d2 |
| children | afcf403709ef |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 | |
| 3 Copyright (c) 2004 Carl Byington - 510 Software Group, released under | |
| 4 the GPL version 2 or any later version at your choice available at | |
| 5 http://www.fsf.org/licenses/gpl.txt | |
| 6 | |
| 7 Based on a sample milter Copyright (c) 2000-2003 Sendmail, Inc. and its | |
| 8 suppliers. Inspired by the DCC by Rhyolite Software | |
| 9 | |
| 10 -p port The port through which the MTA will connect to this milter. | |
| 11 -t sec The timeout value. | |
| 9 | 12 -c Check the config, and print a copy to stdout. Don't start the |
| 4 | 13 milter or do anything with the socket. |
| 16 | 14 -d Add debug syslog entries |
| 15 | |
| 0 | 16 |
| 13 | 17 TODO: |
| 18 1) Add config for max_recipients for each mail domain. Recipients in | |
| 19 excess of that limit will be rejected, and the entire data will be | |
| 20 rejected if it is sent. | |
| 21 | |
| 22 2) Add config for poison addresses. If any recipient is poison, all | |
| 23 recipients are rejected even if they would be whitelisted, and the | |
| 24 data is rejected if sent. | |
| 25 | |
| 34 | 26 3) Add option to only allow one recipient if the return path is empty. |
| 27 | |
| 0 | 28 */ |
| 29 | |
| 30 | |
| 31 // from sendmail sample | |
| 32 #include <sys/types.h> | |
| 33 #include <sys/stat.h> | |
| 34 #include <errno.h> | |
| 35 #include <sysexits.h> | |
| 36 #include <unistd.h> | |
| 37 | |
| 38 // needed for socket io | |
| 39 #include <sys/ioctl.h> | |
| 40 #include <net/if.h> | |
| 41 #include <arpa/inet.h> | |
| 42 #include <netinet/in.h> | |
| 43 #include <netinet/tcp.h> | |
| 44 #include <netdb.h> | |
| 45 #include <sys/socket.h> | |
| 46 | |
| 47 // needed for thread | |
| 48 #include <pthread.h> | |
| 49 | |
| 50 // needed for std c++ collections | |
| 51 #include <set> | |
| 52 #include <map> | |
| 53 #include <list> | |
| 54 | |
| 55 // for the dns resolver | |
| 56 #include <netinet/in.h> | |
| 57 #include <arpa/nameser.h> | |
| 58 #include <resolv.h> | |
| 59 | |
| 60 // misc stuff needed here | |
| 61 #include <ctype.h> | |
| 62 #include <fstream> | |
| 63 #include <syslog.h> | |
| 64 | |
| 8 | 65 static char* dnsbl_version="$Id$"; |
| 0 | 66 |
| 8 | 67 #define DEFAULT "default" |
| 68 #define WHITE "white" | |
| 69 #define BLACK "black" | |
| 70 #define OK "ok" | |
| 71 #define MANY "many" | |
| 72 | |
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73 enum status {oksofar, // not rejected yet |
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74 white, // whitelisted by envelope from |
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75 black, // blacklisted by envelope from or to |
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76 reject, // rejected by a dns list |
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77 reject_tag, // too many bad html tags |
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78 reject_host}; // too many hosts/urls in body |
| 1 | 79 |
| 0 | 80 using namespace std; |
| 81 | |
| 82 extern "C" { | |
| 83 #include "libmilter/mfapi.h" | |
| 84 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr); | |
| 85 sfsistat mlfi_envfrom(SMFICTX *ctx, char **argv); | |
| 86 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **argv); | |
| 8 | 87 sfsistat mlfi_body(SMFICTX *ctx, u_char *data, size_t len); |
| 88 sfsistat mlfi_eom(SMFICTX *ctx); | |
| 89 sfsistat mlfi_abort(SMFICTX *ctx); | |
| 0 | 90 sfsistat mlfi_close(SMFICTX *ctx); |
| 91 } | |
| 92 | |
| 93 struct ltstr { | |
| 94 bool operator()(char* s1, char* s2) const { | |
| 95 return strcmp(s1, s2) < 0; | |
| 96 } | |
| 97 }; | |
| 98 | |
| 99 struct DNSBL { | |
| 100 char *suffix; // blacklist suffix like blackholes.five-ten-sg.com | |
| 101 char *message; // error message with one or two %s operators for the ip address replacement | |
| 102 DNSBL(char *s, char *m); | |
| 103 }; | |
| 104 DNSBL::DNSBL(char *s, char *m) { | |
| 105 suffix = s; | |
| 106 message = m; | |
| 107 } | |
| 108 | |
| 109 typedef DNSBL * DNSBLP; | |
| 110 typedef list<DNSBLP> DNSBLL; | |
| 111 typedef DNSBLL * DNSBLLP; | |
| 112 typedef map<char *, char *, ltstr> string_map; | |
| 113 typedef map<char *, string_map *, ltstr> from_map; | |
| 114 typedef map<char *, DNSBLP, ltstr> dnsblp_map; | |
| 115 typedef map<char *, DNSBLLP, ltstr> dnsbllp_map; | |
| 116 typedef set<char *, ltstr> string_set; | |
| 117 typedef list<char *> string_list; | |
| 34 | 118 typedef map<char *, int, ltstr> ns_map; |
| 0 | 119 |
| 120 struct CONFIG { | |
| 121 // the only mutable stuff once it has been loaded from the config file | |
| 122 int reference_count; // protected by the global config_mutex | |
| 123 // all the rest is constant after loading from the config file | |
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124 int generation; |
| 0 | 125 time_t load_time; |
| 126 string_list config_files; | |
| 127 dnsblp_map dnsbls; | |
| 128 dnsbllp_map dnsblls; | |
| 129 from_map env_from; | |
| 130 string_map env_to_dnsbll; // map recipient to a named dnsbll | |
| 131 string_map env_to_chkfrom; // map recipient to a named from map | |
| 8 | 132 char * content_suffix; // for sbl url body filtering |
| 9 | 133 char * content_message; // "" |
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134 char * host_limit_message; // error message for excessive host names |
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135 int host_limit; // limit on host names |
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136 char * tag_limit_message; // error message for excessive bad html tags |
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137 int tag_limit; // limit on bad html tags |
| 24 | 138 string_set html_tags; // set of valid html tags |
| 28 | 139 string_set tlds; // set of valid tld components |
| 0 | 140 CONFIG(); |
| 141 ~CONFIG(); | |
| 142 }; | |
| 143 CONFIG::CONFIG() { | |
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144 reference_count = 0; |
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145 generation = 0; |
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146 load_time = 0; |
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147 content_suffix = NULL; |
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148 content_message = NULL; |
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149 host_limit_message = NULL; |
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150 host_limit = 0; |
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151 tag_limit_message = NULL; |
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152 tag_limit = 0; |
| 0 | 153 } |
| 154 CONFIG::~CONFIG() { | |
| 155 for (dnsblp_map::iterator i=dnsbls.begin(); i!=dnsbls.end(); i++) { | |
| 156 DNSBLP d = (*i).second; | |
| 24 | 157 // delete the underlying DNSBL objects. |
| 0 | 158 delete d; |
| 159 } | |
| 160 for (dnsbllp_map::iterator i=dnsblls.begin(); i!=dnsblls.end(); i++) { | |
| 161 DNSBLLP d = (*i).second; | |
| 24 | 162 // *d is a list of pointers to DNSBL objects, but |
| 163 // the underlying objects have already been deleted above. | |
| 0 | 164 delete d; |
| 165 } | |
| 166 for (from_map::iterator i=env_from.begin(); i!=env_from.end(); i++) { | |
| 167 string_map *d = (*i).second; | |
| 168 delete d; | |
| 169 } | |
| 170 } | |
| 171 | |
| 16 | 172 static bool debug_syslog = false; |
| 18 | 173 static bool loader_run = true; // used to stop the config loader thread |
| 0 | 174 static string_set all_strings; // owns all the strings, only modified by the config loader thread |
| 175 static CONFIG * config = NULL; // protected by the config_mutex | |
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176 static int generation = 0; // protected by the config_mutex |
| 0 | 177 |
| 178 static pthread_mutex_t config_mutex; | |
| 179 static pthread_mutex_t syslog_mutex; | |
| 180 static pthread_mutex_t resolve_mutex; | |
| 181 | |
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182 struct mlfiPriv; |
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183 |
| 0 | 184 |
| 185 //////////////////////////////////////////////// | |
| 34 | 186 // helper to discard the strings and objects held by an ns_map |
| 187 // | |
| 188 static void discard(ns_map &s); | |
| 189 static void discard(ns_map &s) { | |
| 190 for (ns_map::iterator i=s.begin(); i!=s.end(); i++) { | |
| 191 char *x = (*i).first; | |
| 192 free(x); | |
| 193 } | |
| 194 s.clear(); | |
| 195 } | |
| 196 | |
| 197 //////////////////////////////////////////////// | |
| 198 // helper to register a string in an ns_map | |
| 199 // | |
| 200 static void register_string(ns_map &s, char *name); | |
| 201 static void register_string(ns_map &s, char *name) { | |
| 202 ns_map::iterator i = s.find(name); | |
| 203 if (i != s.end()) return; | |
| 204 char *x = strdup(name); | |
| 205 s[x] = 0; | |
| 206 } | |
| 207 | |
| 208 //////////////////////////////////////////////// | |
| 8 | 209 // helper to discard the strings held by a string_set |
| 0 | 210 // |
| 9 | 211 static void discard(string_set &s); |
| 212 static void discard(string_set &s) { | |
| 8 | 213 for (string_set::iterator i=s.begin(); i!=s.end(); i++) { |
| 214 free(*i); | |
| 215 } | |
| 9 | 216 s.clear(); |
| 8 | 217 } |
| 0 | 218 |
| 12 | 219 //////////////////////////////////////////////// |
| 220 // helper to register a string in a string set | |
| 221 // | |
| 222 static char* register_string(string_set &s, char *name); | |
| 223 static char* register_string(string_set &s, char *name) { | |
| 224 string_set::iterator i = s.find(name); | |
| 225 if (i != s.end()) return *i; | |
| 226 char *x = strdup(name); | |
| 227 s.insert(x); | |
| 228 return x; | |
| 229 } | |
| 230 | |
| 16 | 231 //////////////////////////////////////////////// |
| 232 // syslog a message | |
| 233 // | |
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234 static void my_syslog(mlfiPriv *priv, char *text); |
| 16 | 235 |
| 236 | |
| 12 | 237 // include the content scanner |
| 238 #include "scanner.cpp" | |
| 239 | |
| 240 | |
| 0 | 241 //////////////////////////////////////////////// |
| 242 // mail filter private data, held for us by sendmail | |
| 243 // | |
| 244 struct mlfiPriv | |
| 245 { | |
| 8 | 246 // connection specific data |
| 247 CONFIG *pc; // global context with our maps | |
| 248 int ip; // ip4 address of the smtp client | |
| 249 map<DNSBLP, status> checked; // status from those lists | |
| 250 // message specific data | |
| 0 | 251 char *mailaddr; // envelope from value |
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252 char *queueid; // sendmail queue id |
| 0 | 253 bool authenticated; // client authenticated? if so, suppress all dnsbl checks |
| 8 | 254 bool have_whites; // have at least one whitelisted recipient? need to accept content and remove all non-whitelisted recipients if it fails |
| 255 bool only_whites; // every recipient is whitelisted? | |
| 24 | 256 string_set non_whites; // remember the non-whitelisted recipients so we can remove them if need be |
| 257 recorder *memory; // memory for the content scanner | |
| 8 | 258 url_scanner *scanner; // object to handle body scanning |
| 0 | 259 mlfiPriv(); |
| 260 ~mlfiPriv(); | |
| 8 | 261 void reset(bool final = false); // for a new message |
| 0 | 262 }; |
| 263 mlfiPriv::mlfiPriv() { | |
| 264 pthread_mutex_lock(&config_mutex); | |
| 265 pc = config; | |
| 266 pc->reference_count++; | |
| 267 pthread_mutex_unlock(&config_mutex); | |
| 8 | 268 ip = 0; |
| 269 mailaddr = NULL; | |
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270 queueid = NULL; |
| 8 | 271 authenticated = false; |
| 272 have_whites = false; | |
| 273 only_whites = true; | |
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274 memory = new recorder(this, &pc->html_tags, &pc->tlds); |
| 24 | 275 scanner = new url_scanner(memory); |
| 0 | 276 } |
| 277 mlfiPriv::~mlfiPriv() { | |
| 278 pthread_mutex_lock(&config_mutex); | |
| 279 pc->reference_count--; | |
| 280 pthread_mutex_unlock(&config_mutex); | |
| 8 | 281 reset(true); |
| 282 } | |
| 283 void mlfiPriv::reset(bool final) { | |
| 0 | 284 if (mailaddr) free(mailaddr); |
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285 if (queueid) free(queueid); |
| 24 | 286 discard(non_whites); |
| 287 delete memory; | |
| 8 | 288 delete scanner; |
| 289 if (!final) { | |
| 290 mailaddr = NULL; | |
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291 queueid = NULL; |
| 8 | 292 authenticated = false; |
| 293 have_whites = false; | |
| 294 only_whites = true; | |
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295 memory = new recorder(this, &pc->html_tags, &pc->tlds); |
| 24 | 296 scanner = new url_scanner(memory); |
| 8 | 297 } |
| 0 | 298 } |
| 299 | |
| 300 #define MLFIPRIV ((struct mlfiPriv *) smfi_getpriv(ctx)) | |
| 301 | |
| 302 | |
| 303 //////////////////////////////////////////////// | |
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304 // syslog a message |
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305 // |
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306 static void my_syslog(mlfiPriv *priv, char *text) { |
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307 char buf[1000]; |
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308 if (priv) { |
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309 snprintf(buf, sizeof(buf), "%s %s", priv->queueid, text); |
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310 text = buf; |
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311 } |
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312 pthread_mutex_lock(&syslog_mutex); |
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313 openlog("dnsbl", LOG_PID, LOG_MAIL); |
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314 syslog(LOG_NOTICE, "%s", text); |
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315 closelog(); |
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316 pthread_mutex_unlock(&syslog_mutex); |
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317 } |
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318 |
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319 static void my_syslog(char *text); |
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320 static void my_syslog(char *text) { |
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321 my_syslog(NULL, text); |
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322 } |
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323 |
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324 //////////////////////////////////////////////// |
| 0 | 325 // register a global string |
| 326 // | |
| 327 static char* register_string(char *name); | |
| 328 static char* register_string(char *name) { | |
| 12 | 329 return register_string(all_strings, name); |
| 0 | 330 } |
| 331 | |
| 332 | |
| 333 static char* next_token(char *delim); | |
| 334 static char* next_token(char *delim) { | |
| 335 char *name = strtok(NULL, delim); | |
| 336 if (!name) return name; | |
| 337 return register_string(name); | |
| 338 } | |
| 339 | |
| 340 | |
| 341 //////////////////////////////////////////////// | |
| 342 // lookup an email address in the env_from or env_to maps | |
| 343 // | |
| 344 static char* lookup1(char *email, string_map map); | |
| 345 static char* lookup1(char *email, string_map map) { | |
| 346 string_map::iterator i = map.find(email); | |
| 347 if (i != map.end()) return (*i).second; | |
| 348 char *x = strchr(email, '@'); | |
| 349 if (!x) return DEFAULT; | |
| 350 x++; | |
| 351 i = map.find(x); | |
| 352 if (i != map.end()) return (*i).second; | |
| 353 return DEFAULT; | |
| 354 } | |
| 355 | |
| 356 | |
| 357 //////////////////////////////////////////////// | |
| 358 // lookup an email address in the env_from or env_to maps | |
| 359 // this email address is passed in from sendmail, and will | |
| 360 // always be enclosed in <>. It may have mixed case, just | |
| 361 // as the mail client sent it. | |
| 362 // | |
| 363 static char* lookup(char* email, string_map map); | |
| 364 static char* lookup(char* email, string_map map) { | |
| 365 int n = strlen(email)-2; | |
| 366 if (n < 1) return DEFAULT; // malformed | |
| 367 char *key = strdup(email+1); | |
| 368 key[n] = '\0'; | |
| 369 for (int i=0; i<n; i++) key[i] = tolower(key[i]); | |
| 370 char *rc = lookup1(key, map); | |
| 371 free(key); | |
| 372 return rc; | |
| 373 } | |
| 374 | |
| 375 | |
| 376 //////////////////////////////////////////////// | |
| 377 // find the dnsbl with a specific name | |
| 378 // | |
| 379 static DNSBLP find_dnsbl(CONFIG &dc, char *name); | |
| 380 static DNSBLP find_dnsbl(CONFIG &dc, char *name) { | |
| 381 dnsblp_map::iterator i = dc.dnsbls.find(name); | |
| 382 if (i == dc.dnsbls.end()) return NULL; | |
| 383 return (*i).second; | |
| 384 } | |
| 385 | |
| 386 | |
| 387 //////////////////////////////////////////////// | |
| 388 // find the dnsbll with a specific name | |
| 389 // | |
| 390 static DNSBLLP find_dnsbll(CONFIG &dc, char *name); | |
| 391 static DNSBLLP find_dnsbll(CONFIG &dc, char *name) { | |
| 392 dnsbllp_map::iterator i = dc.dnsblls.find(name); | |
| 393 if (i == dc.dnsblls.end()) return NULL; | |
| 394 return (*i).second; | |
| 395 } | |
| 396 | |
| 397 | |
| 398 //////////////////////////////////////////////// | |
| 399 // find the envfrom map with a specific name | |
| 400 // | |
| 401 static string_map* find_from_map(CONFIG &dc, char *name); | |
| 402 static string_map* find_from_map(CONFIG &dc, char *name) { | |
| 403 from_map::iterator i = dc.env_from.find(name); | |
| 404 if (i == dc.env_from.end()) return NULL; | |
| 405 return (*i).second; | |
| 406 } | |
| 407 | |
| 408 | |
| 409 static string_map& really_find_from_map(CONFIG &dc, char *name); | |
| 410 static string_map& really_find_from_map(CONFIG &dc, char *name) { | |
| 411 string_map *sm = find_from_map(dc, name); | |
| 412 if (!sm) { | |
| 413 sm = new string_map; | |
| 414 dc.env_from[name] = sm; | |
| 415 } | |
| 416 return *sm; | |
| 417 } | |
| 418 | |
| 419 | |
| 420 //////////////////////////////////////////////// | |
| 8 | 421 // |
| 422 // ask a dns question and get an A record answer - we don't try | |
| 423 // very hard, just using the default resolver retry settings. | |
| 424 // If we cannot get an answer, we just accept the mail. The | |
| 425 // caller must ensure thread safety. | |
| 426 // | |
| 0 | 427 // |
| 34 | 428 static int dns_interface(char *question, bool maybe_ip, ns_map *nameservers); |
| 429 static int dns_interface(char *question, bool maybe_ip, ns_map *nameservers) { | |
| 16 | 430 #ifdef NS_PACKETSZ |
| 8 | 431 u_char answer[NS_PACKETSZ]; |
| 432 int length = res_search(question, ns_c_in, ns_t_a, answer, sizeof(answer)); | |
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433 if (length >= 0) { // no error yet |
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434 // parse the answer |
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435 ns_msg handle; |
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436 ns_rr rr; |
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437 if (ns_initparse(answer, length, &handle) == 0) { |
| 34 | 438 // look for ns names |
| 439 if (nameservers) { | |
| 440 ns_map &ns = *nameservers; | |
| 441 int rrnum = 0; | |
| 442 while (ns_parserr(&handle, ns_s_ns, rrnum++, &rr) == 0) { | |
| 443 if (ns_rr_type(rr) == ns_t_ns) { | |
| 444 char nam[NS_MAXDNAME+1]; | |
| 445 char *n = nam; | |
| 446 const u_char *p = ns_rr_rdata(rr); | |
| 447 while (((n-nam) < NS_MAXDNAME) && ((p-answer) < length) && *p) { | |
| 448 size_t s = *(p++); | |
| 449 if (s > 191) { | |
| 450 // compression pointer | |
| 451 s = (s-192)*256 + *(p++); | |
| 452 if (s >= length) break; // pointer outside bounds of answer | |
| 453 p = answer + s; | |
| 454 s = *(p++); | |
| 455 } | |
| 456 if (s > 0) { | |
| 457 if ((n-nam) >= (NS_MAXDNAME-s)) break; // destination would overflow name buffer | |
| 458 if ((p-answer) >= (length-s)) break; // source outside bounds of answer | |
| 459 memcpy(n, p, s); | |
| 460 n += s; | |
| 461 p += s; | |
| 462 *(n++) = '.'; | |
| 463 } | |
| 464 } | |
| 36 | 465 if (n-nam) n--; // remove trailing . |
| 466 *n = '\0'; // null terminate it | |
| 34 | 467 register_string(ns, nam); // ns host to lookup later |
| 468 } | |
| 469 } | |
| 470 rrnum = 0; | |
| 471 while (ns_parserr(&handle, ns_s_ar, rrnum++, &rr) == 0) { | |
| 472 if (ns_rr_type(rr) == ns_t_a) { | |
| 473 char* nam = (char*)ns_rr_name(rr); | |
| 474 ns_map::iterator i = ns.find(nam); | |
| 475 if (i != ns.end()) { | |
| 476 // we want this ip address | |
| 477 int address; | |
| 478 memcpy(&address, ns_rr_rdata(rr), sizeof(address)); | |
| 479 ns[nam] = address; | |
| 480 } | |
| 481 } | |
| 482 } | |
| 483 } | |
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484 int rrnum = 0; |
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485 while (ns_parserr(&handle, ns_s_an, rrnum++, &rr) == 0) { |
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486 if (ns_rr_type(rr) == ns_t_a) { |
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487 int address; |
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488 memcpy(&address, ns_rr_rdata(rr), sizeof(address)); |
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489 return address; |
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490 } |
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491 } |
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492 } |
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493 } |
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494 if (maybe_ip) { |
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495 // might be a bare ip address |
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496 in_addr ip; |
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497 if (inet_aton(question, &ip)) { |
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498 return ip.s_addr; |
| 8 | 499 } |
| 500 } | |
| 501 return 0; | |
| 16 | 502 #else |
| 503 struct hostent *host = gethostbyname(question); | |
| 504 if (!host) return 0; | |
| 505 if (host->h_addrtype != AF_INET) return 0; | |
| 506 int address; | |
| 507 memcpy(&address, host->h_addr, sizeof(address)); | |
| 508 return address; | |
| 509 #endif | |
| 8 | 510 } |
| 511 | |
| 34 | 512 static int protected_dns_interface(char *question, bool maybe_ip, ns_map *nameservers); |
| 513 static int protected_dns_interface(char *question, bool maybe_ip, ns_map *nameservers) { | |
| 8 | 514 int ans; |
| 515 pthread_mutex_lock(&resolve_mutex); | |
| 34 | 516 ans = dns_interface(question, maybe_ip, nameservers); |
| 8 | 517 pthread_mutex_unlock(&resolve_mutex); |
| 518 return ans; | |
| 519 | |
| 520 } | |
| 521 | |
| 522 //////////////////////////////////////////////// | |
| 523 // check a single dnsbl | |
| 524 // | |
| 525 static status check_single(int ip, char *suffix); | |
| 526 static status check_single(int ip, char *suffix) { | |
| 0 | 527 // make a dns question |
| 528 const u_char *src = (const u_char *)&ip; | |
| 529 if (src[0] == 127) return oksofar; // don't do dns lookups on localhost | |
| 16 | 530 #ifdef NS_MAXDNAME |
| 0 | 531 char question[NS_MAXDNAME]; |
| 16 | 532 #else |
| 533 char question[1000]; | |
| 534 #endif | |
| 8 | 535 snprintf(question, sizeof(question), "%u.%u.%u.%u.%s.", src[3], src[2], src[1], src[0], suffix); |
| 536 // ask the question, if we get an A record it implies a blacklisted ip address | |
| 34 | 537 return (protected_dns_interface(question, false, NULL)) ? reject : oksofar; |
| 8 | 538 } |
| 539 | |
| 540 | |
| 541 //////////////////////////////////////////////// | |
| 542 // check a single dnsbl | |
| 543 // | |
| 544 static status check_single(int ip, DNSBL &bl); | |
| 545 static status check_single(int ip, DNSBL &bl) { | |
| 546 return check_single(ip, bl.suffix); | |
| 0 | 547 } |
| 548 | |
| 549 | |
| 550 //////////////////////////////////////////////// | |
| 551 // check the dnsbls specified for this recipient | |
| 552 // | |
| 553 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist); | |
| 554 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist) { | |
| 555 if (priv.authenticated) return oksofar; | |
| 556 if (!dnsbllp) return oksofar; | |
| 557 DNSBLL &dnsbll = *dnsbllp; | |
| 558 for (DNSBLL::iterator i=dnsbll.begin(); i!=dnsbll.end(); i++) { | |
| 559 DNSBLP dp = *i; // non null by construction | |
| 560 status st; | |
| 561 map<DNSBLP, status>::iterator f = priv.checked.find(dp); | |
| 562 if (f == priv.checked.end()) { | |
| 563 // have not checked this list yet | |
| 8 | 564 st = check_single(priv.ip, *dp); |
| 0 | 565 rejectlist = dp; |
| 566 priv.checked[dp] = st; | |
| 567 } | |
| 568 else { | |
| 569 st = (*f).second; | |
| 570 rejectlist = (*f).first; | |
| 571 } | |
| 572 if (st == reject) return st; | |
| 573 } | |
| 574 return oksofar; | |
| 575 } | |
| 576 | |
| 577 | |
| 578 //////////////////////////////////////////////// | |
| 8 | 579 // check the dnsbls specified for this recipient |
| 580 // | |
| 16 | 581 static status check_hosts(mlfiPriv &priv, char *&host, int &ip); |
| 582 static status check_hosts(mlfiPriv &priv, char *&host, int &ip) { | |
| 8 | 583 CONFIG &dc = *priv.pc; |
| 584 if (!dc.content_suffix) return oksofar; | |
| 585 int count = 0; | |
| 34 | 586 ns_map nameservers; |
| 587 int lim = priv.pc->host_limit; | |
| 24 | 588 for (string_set::iterator i=priv.memory->hosts.begin(); i!=priv.memory->hosts.end(); i++) { |
| 8 | 589 count++; |
| 34 | 590 if ((count > lim) && (lim > 0)) { |
| 591 discard(nameservers); | |
| 592 return reject_host; | |
| 593 } | |
| 35 | 594 host = *i; // a reference into priv.memory->hosts, which will live until this smtp transaction is closed |
| 34 | 595 ip = protected_dns_interface(host, true, &nameservers); |
| 16 | 596 if (debug_syslog) { |
| 597 char buf[200]; | |
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598 if (ip) { |
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599 char adr[sizeof "255.255.255.255"]; |
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600 adr[0] = '\0'; |
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601 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); |
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602 snprintf(buf, sizeof(buf), "host %s found at %s", host, adr); |
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603 } |
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604 else { |
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605 snprintf(buf, sizeof(buf), "host %s not found", host); |
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606 } |
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607 my_syslog(&priv, buf); |
| 16 | 608 } |
| 8 | 609 if (ip) { |
| 610 status st = check_single(ip, dc.content_suffix); | |
| 34 | 611 if (st == reject) { |
| 612 discard(nameservers); | |
| 613 return st; | |
| 614 } | |
| 8 | 615 } |
| 616 } | |
| 34 | 617 lim *= 4; // allow average of 3 ns per host name |
| 618 for (ns_map::iterator i=nameservers.begin(); i!=nameservers.end(); i++) { | |
| 619 count++; | |
| 620 if ((count > lim) && (lim > 0)) { | |
| 621 discard(nameservers); | |
| 622 return reject_host; | |
| 623 } | |
| 36 | 624 host = (*i).first; // a transient reference that needs to be replaced before we return it |
| 34 | 625 ip = (*i).second; |
| 626 if (!ip) ip = protected_dns_interface(host, false, NULL); | |
| 627 if (debug_syslog) { | |
| 628 char buf[200]; | |
| 629 if (ip) { | |
| 630 char adr[sizeof "255.255.255.255"]; | |
| 631 adr[0] = '\0'; | |
| 632 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
| 633 snprintf(buf, sizeof(buf), "ns %s found at %s", host, adr); | |
| 634 } | |
| 635 else { | |
| 636 snprintf(buf, sizeof(buf), "ns %s not found", host); | |
| 637 } | |
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638 my_syslog(&priv, buf); |
| 34 | 639 } |
| 640 if (ip) { | |
| 641 status st = check_single(ip, dc.content_suffix); | |
| 642 if (st == reject) { | |
| 36 | 643 host = register_string(priv.memory->hosts, host); // put a copy into priv.memory->hosts, and return that reference |
| 34 | 644 discard(nameservers); |
| 645 return st; | |
| 646 } | |
| 647 } | |
| 648 } | |
| 649 discard(nameservers); | |
| 24 | 650 host = NULL; |
| 26 | 651 int bin = priv.memory->binary_tags; |
| 24 | 652 int bad = priv.memory->bad_html_tags; |
| 34 | 653 lim = priv.pc->tag_limit; |
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654 if (3*bin > bad) return oksofar; // probably .zip or .tar.gz with random content |
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655 if ((bad > lim) && (lim > 0)) return reject_tag; |
| 9 | 656 return oksofar; |
| 8 | 657 } |
| 658 | |
| 659 | |
| 660 //////////////////////////////////////////////// | |
| 0 | 661 // start of sendmail milter interfaces |
| 662 // | |
| 663 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr) | |
| 664 { | |
| 665 // allocate some private memory | |
| 666 mlfiPriv *priv = new mlfiPriv; | |
| 667 if (hostaddr->sa_family == AF_INET) { | |
| 668 priv->ip = ((struct sockaddr_in *)hostaddr)->sin_addr.s_addr; | |
| 669 } | |
| 670 | |
| 671 // save the private data | |
| 672 smfi_setpriv(ctx, (void*)priv); | |
| 673 | |
| 674 // continue processing | |
| 675 return SMFIS_CONTINUE; | |
| 676 } | |
| 677 | |
| 678 sfsistat mlfi_envfrom(SMFICTX *ctx, char **from) | |
| 679 { | |
| 680 mlfiPriv &priv = *MLFIPRIV; | |
| 681 priv.mailaddr = strdup(from[0]); | |
| 682 priv.authenticated = (smfi_getsymval(ctx, "{auth_authen}") != NULL); | |
| 683 return SMFIS_CONTINUE; | |
| 684 } | |
| 685 | |
| 686 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **rcpt) | |
| 687 { | |
| 688 DNSBLP rejectlist = NULL; // list that caused the reject | |
| 689 status st = oksofar; | |
| 690 mlfiPriv &priv = *MLFIPRIV; | |
| 691 CONFIG &dc = *priv.pc; | |
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692 if (!priv.queueid) priv.queueid = strdup(smfi_getsymval(ctx, "i"); |
| 0 | 693 char *rcptaddr = rcpt[0]; |
| 694 char *dnsname = lookup(rcptaddr, dc.env_to_dnsbll); | |
| 695 char *fromname = lookup(rcptaddr, dc.env_to_chkfrom); | |
| 696 if ((strcmp(dnsname, BLACK) == 0) || | |
| 697 (strcmp(fromname, BLACK) == 0)) { | |
| 698 st = black; // two options to blacklist this recipient | |
| 699 } | |
| 700 else if (strcmp(fromname, WHITE) == 0) { | |
| 701 st = white; | |
| 702 } | |
| 703 else { | |
| 704 // check an env_from map | |
| 705 string_map *sm = find_from_map(dc, fromname); | |
| 706 if (sm != NULL) { | |
| 707 fromname = lookup(priv.mailaddr, *sm); // returns default if name not in map | |
| 708 if (strcmp(fromname, BLACK) == 0) { | |
| 709 st = black; // blacklist this envelope from value | |
| 710 } | |
| 711 if (strcmp(fromname, WHITE) == 0) { | |
| 712 st = white; // blacklist this envelope from value | |
| 713 } | |
| 714 } | |
| 715 } | |
| 716 if ((st == oksofar) && (strcmp(dnsname, WHITE) != 0)) { | |
| 717 // check dns lists | |
| 718 st = check_dnsbl(priv, find_dnsbll(dc, dnsname), rejectlist); | |
| 719 } | |
| 720 | |
| 721 if (st == reject) { | |
| 722 // reject the recipient based on some dnsbl | |
| 723 char adr[sizeof "255.255.255.255"]; | |
| 724 adr[0] = '\0'; | |
| 8 | 725 inet_ntop(AF_INET, (const u_char *)&priv.ip, adr, sizeof(adr)); |
| 0 | 726 char buf[2000]; |
| 727 snprintf(buf, sizeof(buf), rejectlist->message, adr, adr); | |
| 728 smfi_setreply(ctx, "550", "5.7.1", buf); | |
| 729 return SMFIS_REJECT; | |
| 730 } | |
| 731 else if (st == black) { | |
| 732 // reject the recipient based on blacklisting either from or to | |
| 733 smfi_setreply(ctx, "550", "5.7.1", "no such user"); | |
| 734 return SMFIS_REJECT; | |
| 735 } | |
| 736 else { | |
| 737 // accept the recipient | |
| 8 | 738 if (st == oksofar) { |
| 739 // but remember the non-whites | |
| 12 | 740 register_string(priv.non_whites, rcptaddr); |
| 8 | 741 priv.only_whites = false; |
| 742 } | |
| 743 if (st == white) { | |
| 744 priv.have_whites = true; | |
| 745 } | |
| 0 | 746 return SMFIS_CONTINUE; |
| 747 } | |
| 748 } | |
| 749 | |
| 8 | 750 sfsistat mlfi_body(SMFICTX *ctx, u_char *data, size_t len) |
| 0 | 751 { |
| 752 mlfiPriv &priv = *MLFIPRIV; | |
| 8 | 753 if (priv.authenticated) return SMFIS_CONTINUE; |
| 754 if (priv.only_whites) return SMFIS_CONTINUE; | |
| 755 priv.scanner->scan(data, len); | |
| 11 | 756 return SMFIS_CONTINUE; |
| 8 | 757 } |
| 758 | |
| 759 sfsistat mlfi_eom(SMFICTX *ctx) | |
| 760 { | |
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761 sfsistat rc; |
| 8 | 762 mlfiPriv &priv = *MLFIPRIV; |
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763 char *host = NULL; |
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764 int ip; |
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765 status st; |
| 8 | 766 // process end of message |
| 767 if (priv.authenticated || | |
| 768 priv.only_whites || | |
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769 ((st=check_hosts(priv, host, ip)) == oksofar)) rc = SMFIS_CONTINUE; |
| 8 | 770 else { |
| 771 if (!priv.have_whites) { | |
| 772 // can reject the entire message | |
| 773 char buf[2000]; | |
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774 if (st == reject_tag) { |
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775 // rejected due to excessive bad html tags |
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776 snprintf(buf, sizeof(buf), priv.pc->tag_limit_message); |
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777 } |
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778 else if (st == reject_host) { |
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779 // rejected due to excessive unique host/urls |
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780 snprintf(buf, sizeof(buf), priv.pc->host_limit_message); |
| 24 | 781 } |
| 782 else { | |
| 783 char adr[sizeof "255.255.255.255"]; | |
| 784 adr[0] = '\0'; | |
| 785 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
| 786 snprintf(buf, sizeof(buf), priv.pc->content_message, host, adr); | |
| 787 } | |
| 8 | 788 smfi_setreply(ctx, "550", "5.7.1", buf); |
| 789 rc = SMFIS_REJECT; | |
| 790 } | |
| 791 else { | |
| 792 // need to accept it but remove the recipients that don't want it | |
| 793 for (string_set::iterator i=priv.non_whites.begin(); i!=priv.non_whites.end(); i++) { | |
| 794 char *rcpt = *i; | |
| 795 smfi_delrcpt(ctx, rcpt); | |
| 796 } | |
| 797 rc = SMFIS_CONTINUE; | |
| 798 } | |
| 0 | 799 } |
| 8 | 800 // reset for a new message on the same connection |
| 801 mlfi_abort(ctx); | |
| 802 return rc; | |
| 803 } | |
| 804 | |
| 805 sfsistat mlfi_abort(SMFICTX *ctx) | |
| 806 { | |
| 807 mlfiPriv &priv = *MLFIPRIV; | |
| 808 priv.reset(); | |
| 0 | 809 return SMFIS_CONTINUE; |
| 810 } | |
| 811 | |
| 812 sfsistat mlfi_close(SMFICTX *ctx) | |
| 813 { | |
| 814 mlfiPriv *priv = MLFIPRIV; | |
| 815 if (!priv) return SMFIS_CONTINUE; | |
| 816 delete priv; | |
| 817 smfi_setpriv(ctx, NULL); | |
| 818 return SMFIS_CONTINUE; | |
| 819 } | |
| 820 | |
| 821 struct smfiDesc smfilter = | |
| 822 { | |
| 823 "DNSBL", // filter name | |
| 824 SMFI_VERSION, // version code -- do not change | |
| 825 SMFIF_DELRCPT, // flags | |
| 826 mlfi_connect, // connection info filter | |
| 827 NULL, // SMTP HELO command filter | |
| 828 mlfi_envfrom, // envelope sender filter | |
| 829 mlfi_envrcpt, // envelope recipient filter | |
| 830 NULL, // header filter | |
| 831 NULL, // end of header | |
| 8 | 832 mlfi_body, // body block filter |
| 833 mlfi_eom, // end of message | |
| 834 mlfi_abort, // message aborted | |
| 0 | 835 mlfi_close, // connection cleanup |
| 836 }; | |
| 837 | |
| 838 | |
| 839 static void dumpit(char *name, string_map map); | |
| 840 static void dumpit(char *name, string_map map) { | |
| 9 | 841 fprintf(stdout, "\n"); |
| 0 | 842 for (string_map::iterator i=map.begin(); i!=map.end(); i++) { |
| 9 | 843 fprintf(stdout, "%s %s->%s\n", name, (*i).first, (*i).second); |
| 0 | 844 } |
| 845 } | |
| 846 | |
| 847 | |
| 848 static void dumpit(from_map map); | |
| 849 static void dumpit(from_map map) { | |
| 850 for (from_map::iterator i=map.begin(); i!=map.end(); i++) { | |
| 3 | 851 char buf[2000]; |
| 852 snprintf(buf, sizeof(buf), "envelope from map for %s", (*i).first); | |
| 0 | 853 string_map *sm = (*i).second; |
| 3 | 854 dumpit(buf, *sm); |
| 0 | 855 } |
| 856 } | |
| 857 | |
| 858 | |
| 3 | 859 static void dumpit(CONFIG &dc); |
| 860 static void dumpit(CONFIG &dc) { | |
| 5 | 861 dumpit(dc.env_from); |
| 862 dumpit("envelope to (dnsbl list)", dc.env_to_dnsbll); | |
| 863 dumpit("envelope to (from map)", dc.env_to_chkfrom); | |
| 9 | 864 fprintf(stdout, "\ndnsbls\n"); |
| 0 | 865 for (dnsblp_map::iterator i=dc.dnsbls.begin(); i!=dc.dnsbls.end(); i++) { |
| 9 | 866 fprintf(stdout, "%s %s %s\n", (*i).first, (*i).second->suffix, (*i).second->message); |
| 0 | 867 } |
| 9 | 868 fprintf(stdout, "\ndnsbl_lists\n"); |
| 0 | 869 for (dnsbllp_map::iterator i=dc.dnsblls.begin(); i!=dc.dnsblls.end(); i++) { |
| 870 char *name = (*i).first; | |
| 871 DNSBLL &dl = *((*i).second); | |
| 9 | 872 fprintf(stdout, "%s", name); |
| 0 | 873 for (DNSBLL::iterator j=dl.begin(); j!=dl.end(); j++) { |
| 874 DNSBL &d = **j; | |
| 9 | 875 fprintf(stdout, " %s", d.suffix); |
| 0 | 876 } |
| 9 | 877 fprintf(stdout, "\n"); |
| 0 | 878 } |
| 9 | 879 if (dc.content_suffix) { |
| 880 fprintf(stdout, "\ncontent filtering enabled with %s %s\n", dc.content_suffix, dc.content_message); | |
| 881 } | |
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882 if (dc.host_limit) { |
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883 fprintf(stdout, "\ncontent filtering for host names enabled with limit %d %s\n", dc.host_limit, dc.host_limit_message); |
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884 } |
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885 if (dc.tag_limit) { |
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886 fprintf(stdout, "\ncontent filtering for excessive html tags enabled with limit %d %s\n", dc.tag_limit, dc.tag_limit_message); |
| 24 | 887 } |
| 9 | 888 fprintf(stdout, "\nfiles\n"); |
| 3 | 889 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { |
| 890 char *f = *i; | |
| 9 | 891 fprintf(stdout, "config includes %s\n", f); |
| 3 | 892 } |
| 893 } | |
| 894 | |
| 895 | |
| 896 //////////////////////////////////////////////// | |
| 897 // check for redundant or recursive include files | |
| 898 // | |
| 899 static bool ok_to_include(CONFIG &dc, char *fn); | |
| 900 static bool ok_to_include(CONFIG &dc, char *fn) { | |
| 901 if (!fn) return false; | |
| 902 bool ok = true; | |
| 903 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 904 char *f = *i; | |
| 905 if (strcmp(f, fn) == 0) { | |
| 906 my_syslog("redundant or recursive include file detected"); | |
| 907 ok = false; | |
| 908 break; | |
| 909 } | |
| 910 } | |
| 911 return ok; | |
| 0 | 912 } |
| 913 | |
| 914 | |
| 915 //////////////////////////////////////////////// | |
| 916 // load a single config file | |
| 917 // | |
| 3 | 918 static void load_conf_dcc(CONFIG &dc, char *name, char *fn); |
| 919 static void load_conf_dcc(CONFIG &dc, char *name, char *fn) { | |
| 920 ifstream is(fn); | |
| 40 | 921 if (is.fail()) { |
| 922 char buf[1000]; | |
| 923 snprintf(buf, sizeof(buf), "include file %s not found", fn); | |
| 924 my_syslog(buf); | |
| 925 return; | |
| 926 } | |
| 39 | 927 dc.config_files.push_back(fn); |
| 928 const int LINE_SIZE = 2000; | |
| 3 | 929 char line[LINE_SIZE]; |
| 39 | 930 char *list = BLACK; |
| 3 | 931 char *delim = " \t"; |
| 932 int curline = 0; | |
| 933 while (!is.eof()) { | |
| 934 is.getline(line, LINE_SIZE); | |
| 935 curline++; | |
| 936 int n = strlen(line); | |
| 937 if (!n) continue; | |
| 938 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 939 if (line[0] == '#') continue; | |
| 940 char *head = line; | |
| 941 if (strspn(line, delim) == 0) { | |
| 942 // have a leading ok/many tag to fetch | |
| 943 char *cmd = strtok(line, delim); | |
| 944 if (strcmp(cmd, MANY) == 0) list = BLACK; | |
| 945 else if (strcmp(cmd, OK) == 0) list = WHITE; | |
| 946 head = cmd + strlen(cmd) + 1; | |
| 947 } | |
| 948 char *cmd = strtok(head, delim); | |
| 949 if (!cmd) continue; | |
| 950 if (strcmp(cmd, "env_from") == 0) { | |
| 951 char *from = next_token(delim); | |
| 952 if (from) { | |
| 953 string_map &fm = really_find_from_map(dc, name); | |
| 954 fm[from] = list; | |
| 955 } | |
| 956 } | |
| 957 else if (strcmp(cmd, "env_to") == 0) { | |
| 958 char *to = next_token(delim); | |
| 959 if (to) { | |
| 960 dc.env_to_dnsbll[to] = list; | |
| 961 dc.env_to_chkfrom[to] = list; | |
| 962 } | |
| 963 } | |
| 964 else if (strcmp(cmd, "substitute") == 0) { | |
| 965 char *tag = next_token(delim); | |
| 966 if (tag && (strcmp(tag, "mail_host") == 0)) { | |
| 967 char *from = next_token(delim); | |
| 968 if (from) { | |
| 969 string_map &fm = really_find_from_map(dc, name); | |
| 970 fm[from] = list; | |
| 971 } | |
| 972 } | |
| 973 } | |
| 974 else if (strcmp(cmd, "include") == 0) { | |
| 975 char *fn = next_token(delim); | |
| 976 if (ok_to_include(dc, fn)) { | |
| 977 load_conf_dcc(dc, name, fn); | |
| 978 } | |
| 979 } | |
| 980 | |
| 981 } | |
| 982 is.close(); | |
| 983 } | |
| 984 | |
| 985 | |
| 0 | 986 static void load_conf(CONFIG &dc, char *fn); |
| 987 static void load_conf(CONFIG &dc, char *fn) { | |
| 39 | 988 ifstream is(fn); |
| 40 | 989 if (is.fail()) { |
| 990 char buf[1000]; | |
| 991 snprintf(buf, sizeof(buf), "include file %s not found", fn); | |
| 992 my_syslog(buf); | |
| 993 return; | |
| 994 } | |
| 0 | 995 dc.config_files.push_back(fn); |
| 996 map<char*, int, ltstr> commands; | |
| 28 | 997 enum {dummy, tld, content, hostlimit, htmllimit, htmltag, dnsbl, dnsbll, envfrom, envto, include, includedcc}; |
| 998 commands["tld" ] = tld; | |
| 8 | 999 commands["content" ] = content; |
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1000 commands["host_limit" ] = hostlimit; |
| 24 | 1001 commands["html_limit" ] = htmllimit; |
| 1002 commands["html_tag" ] = htmltag; | |
| 3 | 1003 commands["dnsbl" ] = dnsbl; |
| 1004 commands["dnsbl_list" ] = dnsbll; | |
| 1005 commands["env_from" ] = envfrom; | |
| 1006 commands["env_to" ] = envto; | |
| 1007 commands["include" ] = include; | |
| 1008 commands["include_dcc"] = includedcc; | |
| 0 | 1009 const int LINE_SIZE = 2000; |
| 1010 char line[LINE_SIZE]; | |
| 1011 char orig[LINE_SIZE]; | |
| 1012 char *delim = " \t"; | |
| 1013 int curline = 0; | |
| 1014 while (!is.eof()) { | |
| 1015 is.getline(line, LINE_SIZE); | |
| 1016 snprintf(orig, sizeof(orig), "%s", line); | |
| 1017 curline++; | |
| 1018 int n = strlen(line); | |
| 1019 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 1020 char *cmd = strtok(line, delim); | |
| 1021 if (cmd && (cmd[0] != '#') && (cmd[0] != '\0')) { | |
| 1022 // have a decent command | |
| 1023 bool processed = false; | |
| 1024 switch (commands[cmd]) { | |
| 28 | 1025 case tld: { |
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1026 char *tld = next_token(delim); |
| 28 | 1027 if (!tld) break; // no tld value |
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1028 dc.tlds.insert(tld); |
| 28 | 1029 processed = true; |
| 1030 } break; | |
| 1031 | |
| 8 | 1032 case content: { |
| 1033 char *suff = strtok(NULL, delim); | |
| 24 | 1034 if (!suff) break; // no dns suffix |
| 8 | 1035 char *msg = suff + strlen(suff); |
| 1036 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 1037 msg = strchr(msg+1, '\''); | |
| 1038 if (!msg) break; // no reply message template | |
| 1039 msg++; // move over the leading ' | |
| 1040 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 1041 char *last = strchr(msg, '\''); | |
| 1042 if (!last) break; // no trailing quote | |
| 1043 *last = '\0'; // make it a null terminator | |
| 1044 dc.content_suffix = register_string(suff); | |
| 1045 dc.content_message = register_string(msg); | |
| 1046 processed = true; | |
| 1047 } break; | |
| 1048 | |
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1049 case hostlimit: { |
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1050 char *limit = strtok(NULL, delim); |
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1051 if (!limit) break; // no integer limit |
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1052 char *msg = limit + strlen(limit); |
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1053 if ((msg - line) >= strlen(orig)) break; // line ended with the limit |
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1054 msg = strchr(msg+1, '\''); |
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1055 if (!msg) break; // no reply message template |
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1056 msg++; // move over the leading ' |
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1057 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote |
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1058 char *last = strchr(msg, '\''); |
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1059 if (!last) break; // no trailing quote |
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1060 *last = '\0'; // make it a null terminator |
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1061 dc.host_limit = atoi(limit); |
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1062 dc.host_limit_message = register_string(msg); |
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1063 processed = true; |
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1064 } break; |
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1065 |
| 24 | 1066 case htmllimit: { |
| 1067 char *limit = strtok(NULL, delim); | |
| 1068 if (!limit) break; // no integer limit | |
| 1069 char *msg = limit + strlen(limit); | |
| 1070 if ((msg - line) >= strlen(orig)) break; // line ended with the limit | |
| 1071 msg = strchr(msg+1, '\''); | |
| 1072 if (!msg) break; // no reply message template | |
| 1073 msg++; // move over the leading ' | |
| 1074 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 1075 char *last = strchr(msg, '\''); | |
| 1076 if (!last) break; // no trailing quote | |
| 1077 *last = '\0'; // make it a null terminator | |
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1078 dc.tag_limit = atoi(limit); |
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1079 dc.tag_limit_message = register_string(msg); |
| 24 | 1080 processed = true; |
| 1081 } break; | |
| 1082 | |
| 1083 case htmltag: { | |
| 1084 char *tag = next_token(delim); | |
| 1085 if (!tag) break; // no html tag value | |
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1086 dc.html_tags.insert(tag); // base version |
| 26 | 1087 char buf[200]; |
| 1088 snprintf(buf, sizeof(buf), "/%s", tag); | |
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1089 dc.html_tags.insert(register_string(buf)); // leading / |
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1090 snprintf(buf, sizeof(buf), "%s/", tag); |
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1091 dc.html_tags.insert(register_string(buf)); // trailing / |
| 24 | 1092 processed = true; |
| 1093 } break; | |
| 1094 | |
| 0 | 1095 case dnsbl: { |
| 1096 // have a new dnsbl to use | |
| 1097 char *name = next_token(delim); | |
| 1098 if (!name) break; // no name name | |
| 1099 if (find_dnsbl(dc, name)) break; // duplicate entry | |
| 1100 char *suff = strtok(NULL, delim); | |
| 1101 if (!suff) break; // no dns suffic | |
| 1102 char *msg = suff + strlen(suff); | |
| 1103 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 1104 msg = strchr(msg+1, '\''); | |
| 1105 if (!msg) break; // no reply message template | |
| 1106 msg++; // move over the leading ' | |
| 1107 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 1108 char *last = strchr(msg, '\''); | |
| 1109 if (!last) break; // no trailing quote | |
| 1110 *last = '\0'; // make it a null terminator | |
| 1111 dc.dnsbls[name] = new DNSBL(register_string(suff), register_string(msg)); | |
| 1112 processed = true; | |
| 1113 } break; | |
| 1114 | |
| 1115 case dnsbll: { | |
| 1116 // define a new combination of dnsbls | |
| 1117 char *name = next_token(delim); | |
| 1118 if (!name) break; | |
| 1119 if (find_dnsbll(dc, name)) break; // duplicate entry | |
| 1120 char *list = next_token(delim); | |
| 1121 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 1122 DNSBLLP d = new DNSBLL; | |
| 1123 DNSBLP p = find_dnsbl(dc, list); | |
| 1124 if (p) d->push_back(p); | |
| 1125 while (true) { | |
| 1126 list = next_token(delim); | |
| 1127 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 1128 DNSBLP p = find_dnsbl(dc, list); | |
| 1129 if (p) d->push_back(p); | |
| 1130 } | |
| 1131 dc.dnsblls[name] = d; | |
| 1132 processed = true; | |
| 1133 } break; | |
| 1134 | |
| 1135 case envfrom: { | |
| 1136 // add an entry into the named string_map | |
| 1137 char *name = next_token(delim); | |
| 1138 if (!name) break; | |
| 1139 char *from = next_token(delim); | |
| 1140 if (!from) break; | |
| 1141 char *list = next_token(delim); | |
| 1142 if (!list) break; | |
| 1143 if ((strcmp(list, WHITE) == 0) || | |
| 1144 (strcmp(list, BLACK) == 0)) { | |
| 1145 string_map &fm = really_find_from_map(dc, name); | |
| 1146 fm[from] = list; | |
| 1147 processed = true; | |
| 1148 } | |
| 1149 else { | |
| 1150 // list may be the name of a previously defined from_map | |
| 1151 string_map *m = find_from_map(dc, list); | |
| 1152 if (m && (strcmp(list,name) != 0)) { | |
| 1153 string_map &pm = *m; | |
| 1154 string_map &fm = really_find_from_map(dc, name); | |
| 1155 fm.insert(pm.begin(), pm.end()); | |
| 1156 processed = true; | |
| 1157 } | |
| 1158 } | |
| 1159 } break; | |
| 1160 | |
| 1161 case envto: { | |
| 1162 // define the dnsbl_list and env_from maps to use for this recipient | |
| 1163 char *to = next_token(delim); | |
| 1164 if (!to) break; | |
| 1165 char *list = next_token(delim); | |
| 1166 if (!list) break; | |
| 1167 char *from = next_token(delim); | |
| 1168 if (!from) break; | |
| 1169 dc.env_to_dnsbll[to] = list; | |
| 1170 dc.env_to_chkfrom[to] = from; | |
| 1171 processed = true; | |
| 1172 } break; | |
| 1173 | |
| 1174 case include: { | |
| 1175 char *fn = next_token(delim); | |
| 3 | 1176 if (ok_to_include(dc, fn)) { |
| 1177 load_conf(dc, fn); | |
| 1178 processed = true; | |
| 1179 } | |
| 1180 } break; | |
| 1181 | |
| 1182 case includedcc: { | |
| 1183 char *name = next_token(delim); | |
| 1184 if (!name) break; | |
| 1185 char *fn = next_token(delim); | |
| 1186 if (ok_to_include(dc, fn)) { | |
| 1187 load_conf_dcc(dc, name, fn); | |
| 1188 processed = true; | |
| 0 | 1189 } |
| 1190 } break; | |
| 1191 | |
| 1192 default: { | |
| 1193 } break; | |
| 1194 } | |
| 1195 if (!processed) { | |
| 1196 pthread_mutex_lock(&syslog_mutex); | |
| 1197 openlog("dnsbl", LOG_PID, LOG_MAIL); | |
| 1198 syslog(LOG_ERR, "ignoring file %s line %d : %s\n", fn, curline, orig); | |
| 1199 closelog(); | |
| 1200 pthread_mutex_unlock(&syslog_mutex); | |
| 1201 } | |
| 1202 } | |
| 1203 } | |
| 1204 is.close(); | |
| 1205 } | |
| 1206 | |
| 1207 | |
| 1208 //////////////////////////////////////////////// | |
| 1209 // reload the config | |
| 1210 // | |
| 1211 static CONFIG* new_conf(); | |
| 1212 static CONFIG* new_conf() { | |
| 1213 CONFIG *newc = new CONFIG; | |
|
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1214 pthread_mutex_lock(&config_mutex); |
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1215 newc->generation = generation++; |
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1216 pthread_mutex_unlock(&config_mutex); |
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1217 char buf[200]; |
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1218 snprintf(buf, sizeof(buf), "loading configuration generation %d", newc->generation); |
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1219 my_syslog(buf); |
| 0 | 1220 load_conf(*newc, "dnsbl.conf"); |
| 1221 newc->load_time = time(NULL); | |
| 1222 return newc; | |
| 1223 } | |
| 1224 | |
| 1225 | |
| 1226 //////////////////////////////////////////////// | |
| 1227 // thread to watch the old config files for changes | |
| 1228 // and reload when needed. we also cleanup old | |
| 1229 // configs whose reference count has gone to zero. | |
| 1230 // | |
| 1231 static void* config_loader(void *arg); | |
| 1232 static void* config_loader(void *arg) { | |
| 1233 typedef set<CONFIG *> configp_set; | |
| 1234 configp_set old_configs; | |
| 18 | 1235 while (loader_run) { |
| 0 | 1236 sleep(180); // look for modifications every 3 minutes |
| 18 | 1237 if (!loader_run) break; |
| 0 | 1238 CONFIG &dc = *config; |
| 1239 time_t then = dc.load_time; | |
| 1240 struct stat st; | |
| 1241 bool reload = false; | |
| 1242 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 1243 char *fn = *i; | |
| 1244 if (stat(fn, &st)) reload = true; // file disappeared | |
| 1245 else if (st.st_mtime > then) reload = true; // file modified | |
| 1246 if (reload) break; | |
| 1247 } | |
| 1248 if (reload) { | |
| 1249 CONFIG *newc = new_conf(); | |
| 1250 // replace the global config pointer | |
| 1251 pthread_mutex_lock(&config_mutex); | |
| 1252 CONFIG *old = config; | |
| 1253 config = newc; | |
| 1254 pthread_mutex_unlock(&config_mutex); | |
| 1255 if (old) old_configs.insert(old); | |
| 1256 } | |
| 1257 // now look for old configs with zero ref counts | |
| 1258 for (configp_set::iterator i=old_configs.begin(); i!=old_configs.end(); ) { | |
| 1259 CONFIG *old = *i; | |
| 1260 if (!old->reference_count) { | |
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1261 char buf[200]; |
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1262 snprintf(buf, sizeof(buf), "freeing memory for old configuration generation %d", old->generation); |
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1263 my_syslog(buf); |
| 0 | 1264 delete old; // destructor does all the work |
| 1265 old_configs.erase(i++); | |
| 1266 } | |
| 1267 else i++; | |
| 1268 } | |
| 1269 } | |
| 18 | 1270 return NULL; |
| 0 | 1271 } |
| 1272 | |
| 1273 | |
| 1274 static void usage(char *prog); | |
| 1275 static void usage(char *prog) | |
| 1276 { | |
| 16 | 1277 fprintf(stderr, "Usage: %s [-d] [-c] -p socket-addr [-t timeout]\n", prog); |
| 0 | 1278 fprintf(stderr, "where socket-addr is for the connection to sendmail and should be one of\n"); |
| 1279 fprintf(stderr, " inet:port@local-ip-address\n"); | |
| 1280 fprintf(stderr, " local:local-domain-socket-file-name\n"); | |
| 9 | 1281 fprintf(stderr, "-c will load and dump the config to stdout\n"); |
| 16 | 1282 fprintf(stderr, "-d will add some syslog debug messages\n"); |
| 0 | 1283 } |
| 1284 | |
| 1285 | |
| 1286 int main(int argc, char**argv) | |
| 1287 { | |
| 3 | 1288 bool check = false; |
| 1289 bool setconn = false; | |
| 0 | 1290 int c; |
| 16 | 1291 const char *args = "p:t:hcd"; |
| 0 | 1292 extern char *optarg; |
| 1293 | |
| 1294 // Process command line options | |
| 1295 while ((c = getopt(argc, argv, args)) != -1) { | |
| 1296 switch (c) { | |
| 1297 case 'p': | |
| 1298 if (optarg == NULL || *optarg == '\0') { | |
| 1299 fprintf(stderr, "Illegal conn: %s\n", optarg); | |
| 1300 exit(EX_USAGE); | |
| 1301 } | |
| 1302 if (smfi_setconn(optarg) == MI_FAILURE) { | |
| 1303 fprintf(stderr, "smfi_setconn failed\n"); | |
| 1304 exit(EX_SOFTWARE); | |
| 1305 } | |
| 1306 | |
| 1307 if (strncasecmp(optarg, "unix:", 5) == 0) unlink(optarg + 5); | |
| 1308 else if (strncasecmp(optarg, "local:", 6) == 0) unlink(optarg + 6); | |
| 3 | 1309 setconn = true; |
| 0 | 1310 break; |
| 1311 | |
| 1312 case 't': | |
| 1313 if (optarg == NULL || *optarg == '\0') { | |
| 1314 fprintf(stderr, "Illegal timeout: %s\n", optarg); | |
| 1315 exit(EX_USAGE); | |
| 1316 } | |
| 1317 if (smfi_settimeout(atoi(optarg)) == MI_FAILURE) { | |
| 1318 fprintf(stderr, "smfi_settimeout failed\n"); | |
| 1319 exit(EX_SOFTWARE); | |
| 1320 } | |
| 1321 break; | |
| 1322 | |
| 3 | 1323 case 'c': |
| 1324 check = true; | |
| 1325 break; | |
| 1326 | |
| 16 | 1327 case 'd': |
| 1328 debug_syslog = true; | |
| 1329 break; | |
| 1330 | |
| 0 | 1331 case 'h': |
| 1332 default: | |
| 1333 usage(argv[0]); | |
| 1334 exit(EX_USAGE); | |
| 1335 } | |
| 1336 } | |
| 5 | 1337 |
| 1338 if (check) { | |
| 1339 CONFIG &dc = *new_conf(); | |
| 1340 dumpit(dc); | |
| 1341 return 0; | |
| 1342 } | |
| 1343 | |
| 0 | 1344 if (!setconn) { |
| 1345 fprintf(stderr, "%s: Missing required -p argument\n", argv[0]); | |
| 1346 usage(argv[0]); | |
| 1347 exit(EX_USAGE); | |
| 1348 } | |
| 5 | 1349 |
| 0 | 1350 if (smfi_register(smfilter) == MI_FAILURE) { |
| 1351 fprintf(stderr, "smfi_register failed\n"); | |
| 1352 exit(EX_UNAVAILABLE); | |
| 1353 } | |
| 1354 | |
| 1355 // switch to background mode | |
| 1356 if (daemon(1,0) < 0) { | |
| 1357 fprintf(stderr, "daemon() call failed\n"); | |
| 1358 exit(EX_UNAVAILABLE); | |
| 1359 } | |
| 1360 | |
| 1361 // initialize the thread sync objects | |
| 1362 pthread_mutex_init(&config_mutex, 0); | |
| 1363 pthread_mutex_init(&syslog_mutex, 0); | |
| 1364 pthread_mutex_init(&resolve_mutex, 0); | |
| 1365 | |
| 1366 // load the initial config | |
| 1367 config = new_conf(); | |
| 1368 | |
| 1369 // only create threads after the fork() in daemon | |
| 1370 pthread_t tid; | |
| 1371 if (pthread_create(&tid, 0, config_loader, 0)) | |
| 1372 my_syslog("failed to create config loader thread"); | |
| 1373 if (pthread_detach(tid)) | |
| 1374 my_syslog("failed to detach config loader thread"); | |
| 1375 | |
| 1376 // write the pid | |
| 1377 const char *pidpath = "/var/run/dnsbl.pid"; | |
| 1378 unlink(pidpath); | |
| 1379 FILE *f = fopen(pidpath, "w"); | |
| 1380 if (f) { | |
| 22 | 1381 #ifdef linux |
| 1382 // from a comment in the DCC source code: | |
| 1383 // Linux threads are broken. Signals given the | |
| 1384 // original process are delivered to only the | |
| 1385 // thread that happens to have that PID. The | |
| 1386 // sendmail libmilter thread that needs to hear | |
| 1387 // SIGINT and other signals does not, and that breaks | |
| 1388 // scripts that need to stop milters. | |
| 1389 // However, signaling the process group works. | |
| 0 | 1390 fprintf(f, "-%d\n", (u_int)getpgrp()); |
| 22 | 1391 #else |
| 1392 fprintf(f, "%d\n", (u_int)getpid()); | |
| 1393 #endif | |
| 0 | 1394 fclose(f); |
| 1395 } | |
| 1396 | |
| 18 | 1397 time_t starting = time(NULL); |
| 1398 int rc = smfi_main(); | |
| 22 | 1399 if ((rc != MI_SUCCESS) && (time(NULL) > starting+5*60)) { |
| 18 | 1400 my_syslog("trying to restart after smfi_main()"); |
| 1401 loader_run = false; // eventually the config loader thread will terminate | |
| 1402 execvp(argv[0], argv); | |
| 1403 } | |
| 1404 exit((rc == MI_SUCCESS) ? 0 : EX_UNAVAILABLE); | |
| 0 | 1405 } |
| 8 | 1406 |