Mercurial > dnsbl
annotate src/dnsbl.cpp @ 36:95607fbef608
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| author | carl |
|---|---|
| date | Sun, 30 May 2004 18:38:36 -0700 |
| parents | d718dca81bc9 |
| children | 6e9d0b2d0720 |
| 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 | |
| 182 | |
| 183 //////////////////////////////////////////////// | |
| 34 | 184 // helper to discard the strings and objects held by an ns_map |
| 185 // | |
| 186 static void discard(ns_map &s); | |
| 187 static void discard(ns_map &s) { | |
| 188 for (ns_map::iterator i=s.begin(); i!=s.end(); i++) { | |
| 189 char *x = (*i).first; | |
| 190 free(x); | |
| 191 } | |
| 192 s.clear(); | |
| 193 } | |
| 194 | |
| 195 //////////////////////////////////////////////// | |
| 196 // helper to register a string in an ns_map | |
| 197 // | |
| 198 static void register_string(ns_map &s, char *name); | |
| 199 static void register_string(ns_map &s, char *name) { | |
| 200 ns_map::iterator i = s.find(name); | |
| 201 if (i != s.end()) return; | |
| 202 char *x = strdup(name); | |
| 203 s[x] = 0; | |
| 204 } | |
| 205 | |
| 206 //////////////////////////////////////////////// | |
| 8 | 207 // helper to discard the strings held by a string_set |
| 0 | 208 // |
| 9 | 209 static void discard(string_set &s); |
| 210 static void discard(string_set &s) { | |
| 8 | 211 for (string_set::iterator i=s.begin(); i!=s.end(); i++) { |
| 212 free(*i); | |
| 213 } | |
| 9 | 214 s.clear(); |
| 8 | 215 } |
| 0 | 216 |
| 12 | 217 //////////////////////////////////////////////// |
| 218 // helper to register a string in a string set | |
| 219 // | |
| 220 static char* register_string(string_set &s, char *name); | |
| 221 static char* register_string(string_set &s, char *name) { | |
| 222 string_set::iterator i = s.find(name); | |
| 223 if (i != s.end()) return *i; | |
| 224 char *x = strdup(name); | |
| 225 s.insert(x); | |
| 226 return x; | |
| 227 } | |
| 228 | |
| 16 | 229 //////////////////////////////////////////////// |
| 230 // syslog a message | |
| 231 // | |
| 232 static void my_syslog(char *text); | |
| 233 static void my_syslog(char *text) { | |
| 234 pthread_mutex_lock(&syslog_mutex); | |
| 235 openlog("dnsbl", LOG_PID, LOG_MAIL); | |
| 236 syslog(LOG_NOTICE, "%s", text); | |
| 237 closelog(); | |
| 238 pthread_mutex_unlock(&syslog_mutex); | |
| 239 } | |
| 240 | |
| 241 | |
| 12 | 242 // include the content scanner |
| 243 #include "scanner.cpp" | |
| 244 | |
| 245 | |
| 0 | 246 //////////////////////////////////////////////// |
| 247 // mail filter private data, held for us by sendmail | |
| 248 // | |
| 249 struct mlfiPriv | |
| 250 { | |
| 8 | 251 // connection specific data |
| 252 CONFIG *pc; // global context with our maps | |
| 253 int ip; // ip4 address of the smtp client | |
| 254 map<DNSBLP, status> checked; // status from those lists | |
| 255 // message specific data | |
| 0 | 256 char *mailaddr; // envelope from value |
| 257 bool authenticated; // client authenticated? if so, suppress all dnsbl checks | |
| 8 | 258 bool have_whites; // have at least one whitelisted recipient? need to accept content and remove all non-whitelisted recipients if it fails |
| 259 bool only_whites; // every recipient is whitelisted? | |
| 24 | 260 string_set non_whites; // remember the non-whitelisted recipients so we can remove them if need be |
| 261 recorder *memory; // memory for the content scanner | |
| 8 | 262 url_scanner *scanner; // object to handle body scanning |
| 0 | 263 mlfiPriv(); |
| 264 ~mlfiPriv(); | |
| 8 | 265 void reset(bool final = false); // for a new message |
| 0 | 266 }; |
| 267 mlfiPriv::mlfiPriv() { | |
| 268 pthread_mutex_lock(&config_mutex); | |
| 269 pc = config; | |
| 270 pc->reference_count++; | |
| 271 pthread_mutex_unlock(&config_mutex); | |
| 8 | 272 ip = 0; |
| 273 mailaddr = NULL; | |
| 274 authenticated = false; | |
| 275 have_whites = false; | |
| 276 only_whites = true; | |
| 28 | 277 memory = new recorder(&pc->html_tags, &pc->tlds); |
| 24 | 278 scanner = new url_scanner(memory); |
| 0 | 279 } |
| 280 mlfiPriv::~mlfiPriv() { | |
| 281 pthread_mutex_lock(&config_mutex); | |
| 282 pc->reference_count--; | |
| 283 pthread_mutex_unlock(&config_mutex); | |
| 8 | 284 reset(true); |
| 285 } | |
| 286 void mlfiPriv::reset(bool final) { | |
| 0 | 287 if (mailaddr) free(mailaddr); |
| 24 | 288 discard(non_whites); |
| 289 delete memory; | |
| 8 | 290 delete scanner; |
| 291 if (!final) { | |
| 292 mailaddr = NULL; | |
| 293 authenticated = false; | |
| 294 have_whites = false; | |
| 295 only_whites = true; | |
| 28 | 296 memory = new recorder(&pc->html_tags, &pc->tlds); |
| 24 | 297 scanner = new url_scanner(memory); |
| 8 | 298 } |
| 0 | 299 } |
| 300 | |
| 301 #define MLFIPRIV ((struct mlfiPriv *) smfi_getpriv(ctx)) | |
| 302 | |
| 303 | |
| 304 //////////////////////////////////////////////// | |
| 305 // register a global string | |
| 306 // | |
| 307 static char* register_string(char *name); | |
| 308 static char* register_string(char *name) { | |
| 12 | 309 return register_string(all_strings, name); |
| 0 | 310 } |
| 311 | |
| 312 | |
| 313 static char* next_token(char *delim); | |
| 314 static char* next_token(char *delim) { | |
| 315 char *name = strtok(NULL, delim); | |
| 316 if (!name) return name; | |
| 317 return register_string(name); | |
| 318 } | |
| 319 | |
| 320 | |
| 321 //////////////////////////////////////////////// | |
| 322 // lookup an email address in the env_from or env_to maps | |
| 323 // | |
| 324 static char* lookup1(char *email, string_map map); | |
| 325 static char* lookup1(char *email, string_map map) { | |
| 326 string_map::iterator i = map.find(email); | |
| 327 if (i != map.end()) return (*i).second; | |
| 328 char *x = strchr(email, '@'); | |
| 329 if (!x) return DEFAULT; | |
| 330 x++; | |
| 331 i = map.find(x); | |
| 332 if (i != map.end()) return (*i).second; | |
| 333 return DEFAULT; | |
| 334 } | |
| 335 | |
| 336 | |
| 337 //////////////////////////////////////////////// | |
| 338 // lookup an email address in the env_from or env_to maps | |
| 339 // this email address is passed in from sendmail, and will | |
| 340 // always be enclosed in <>. It may have mixed case, just | |
| 341 // as the mail client sent it. | |
| 342 // | |
| 343 static char* lookup(char* email, string_map map); | |
| 344 static char* lookup(char* email, string_map map) { | |
| 345 int n = strlen(email)-2; | |
| 346 if (n < 1) return DEFAULT; // malformed | |
| 347 char *key = strdup(email+1); | |
| 348 key[n] = '\0'; | |
| 349 for (int i=0; i<n; i++) key[i] = tolower(key[i]); | |
| 350 char *rc = lookup1(key, map); | |
| 351 free(key); | |
| 352 return rc; | |
| 353 } | |
| 354 | |
| 355 | |
| 356 //////////////////////////////////////////////// | |
| 357 // find the dnsbl with a specific name | |
| 358 // | |
| 359 static DNSBLP find_dnsbl(CONFIG &dc, char *name); | |
| 360 static DNSBLP find_dnsbl(CONFIG &dc, char *name) { | |
| 361 dnsblp_map::iterator i = dc.dnsbls.find(name); | |
| 362 if (i == dc.dnsbls.end()) return NULL; | |
| 363 return (*i).second; | |
| 364 } | |
| 365 | |
| 366 | |
| 367 //////////////////////////////////////////////// | |
| 368 // find the dnsbll with a specific name | |
| 369 // | |
| 370 static DNSBLLP find_dnsbll(CONFIG &dc, char *name); | |
| 371 static DNSBLLP find_dnsbll(CONFIG &dc, char *name) { | |
| 372 dnsbllp_map::iterator i = dc.dnsblls.find(name); | |
| 373 if (i == dc.dnsblls.end()) return NULL; | |
| 374 return (*i).second; | |
| 375 } | |
| 376 | |
| 377 | |
| 378 //////////////////////////////////////////////// | |
| 379 // find the envfrom map with a specific name | |
| 380 // | |
| 381 static string_map* find_from_map(CONFIG &dc, char *name); | |
| 382 static string_map* find_from_map(CONFIG &dc, char *name) { | |
| 383 from_map::iterator i = dc.env_from.find(name); | |
| 384 if (i == dc.env_from.end()) return NULL; | |
| 385 return (*i).second; | |
| 386 } | |
| 387 | |
| 388 | |
| 389 static string_map& really_find_from_map(CONFIG &dc, char *name); | |
| 390 static string_map& really_find_from_map(CONFIG &dc, char *name) { | |
| 391 string_map *sm = find_from_map(dc, name); | |
| 392 if (!sm) { | |
| 393 sm = new string_map; | |
| 394 dc.env_from[name] = sm; | |
| 395 } | |
| 396 return *sm; | |
| 397 } | |
| 398 | |
| 399 | |
| 400 //////////////////////////////////////////////// | |
| 8 | 401 // |
| 402 // ask a dns question and get an A record answer - we don't try | |
| 403 // very hard, just using the default resolver retry settings. | |
| 404 // If we cannot get an answer, we just accept the mail. The | |
| 405 // caller must ensure thread safety. | |
| 406 // | |
| 0 | 407 // |
| 34 | 408 static int dns_interface(char *question, bool maybe_ip, ns_map *nameservers); |
| 409 static int dns_interface(char *question, bool maybe_ip, ns_map *nameservers) { | |
| 16 | 410 #ifdef NS_PACKETSZ |
| 8 | 411 u_char answer[NS_PACKETSZ]; |
| 412 int length = res_search(question, ns_c_in, ns_t_a, answer, sizeof(answer)); | |
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413 if (length >= 0) { // no error yet |
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414 // parse the answer |
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415 ns_msg handle; |
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416 ns_rr rr; |
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417 if (ns_initparse(answer, length, &handle) == 0) { |
| 34 | 418 // look for ns names |
| 419 if (nameservers) { | |
| 420 ns_map &ns = *nameservers; | |
| 421 int rrnum = 0; | |
| 422 while (ns_parserr(&handle, ns_s_ns, rrnum++, &rr) == 0) { | |
| 423 if (ns_rr_type(rr) == ns_t_ns) { | |
| 424 char nam[NS_MAXDNAME+1]; | |
| 425 char *n = nam; | |
| 426 const u_char *p = ns_rr_rdata(rr); | |
| 427 while (((n-nam) < NS_MAXDNAME) && ((p-answer) < length) && *p) { | |
| 428 size_t s = *(p++); | |
| 429 if (s > 191) { | |
| 430 // compression pointer | |
| 431 s = (s-192)*256 + *(p++); | |
| 432 if (s >= length) break; // pointer outside bounds of answer | |
| 433 p = answer + s; | |
| 434 s = *(p++); | |
| 435 } | |
| 436 if (s > 0) { | |
| 437 if ((n-nam) >= (NS_MAXDNAME-s)) break; // destination would overflow name buffer | |
| 438 if ((p-answer) >= (length-s)) break; // source outside bounds of answer | |
| 439 memcpy(n, p, s); | |
| 440 n += s; | |
| 441 p += s; | |
| 442 *(n++) = '.'; | |
| 443 } | |
| 444 } | |
| 36 | 445 if (n-nam) n--; // remove trailing . |
| 446 *n = '\0'; // null terminate it | |
| 34 | 447 register_string(ns, nam); // ns host to lookup later |
| 448 } | |
| 449 } | |
| 450 rrnum = 0; | |
| 451 while (ns_parserr(&handle, ns_s_ar, rrnum++, &rr) == 0) { | |
| 452 if (ns_rr_type(rr) == ns_t_a) { | |
| 453 char* nam = (char*)ns_rr_name(rr); | |
| 454 ns_map::iterator i = ns.find(nam); | |
| 455 if (i != ns.end()) { | |
| 456 // we want this ip address | |
| 457 int address; | |
| 458 memcpy(&address, ns_rr_rdata(rr), sizeof(address)); | |
| 459 ns[nam] = address; | |
| 460 } | |
| 461 } | |
| 462 } | |
| 463 } | |
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464 int rrnum = 0; |
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465 while (ns_parserr(&handle, ns_s_an, rrnum++, &rr) == 0) { |
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466 if (ns_rr_type(rr) == ns_t_a) { |
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467 int address; |
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468 memcpy(&address, ns_rr_rdata(rr), sizeof(address)); |
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469 return address; |
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470 } |
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471 } |
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472 } |
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473 } |
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474 if (maybe_ip) { |
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475 // might be a bare ip address |
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476 in_addr ip; |
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477 if (inet_aton(question, &ip)) { |
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478 return ip.s_addr; |
| 8 | 479 } |
| 480 } | |
| 481 return 0; | |
| 16 | 482 #else |
| 483 struct hostent *host = gethostbyname(question); | |
| 484 if (!host) return 0; | |
| 485 if (host->h_addrtype != AF_INET) return 0; | |
| 486 int address; | |
| 487 memcpy(&address, host->h_addr, sizeof(address)); | |
| 488 return address; | |
| 489 #endif | |
| 8 | 490 } |
| 491 | |
| 34 | 492 static int protected_dns_interface(char *question, bool maybe_ip, ns_map *nameservers); |
| 493 static int protected_dns_interface(char *question, bool maybe_ip, ns_map *nameservers) { | |
| 8 | 494 int ans; |
| 495 pthread_mutex_lock(&resolve_mutex); | |
| 34 | 496 ans = dns_interface(question, maybe_ip, nameservers); |
| 8 | 497 pthread_mutex_unlock(&resolve_mutex); |
| 498 return ans; | |
| 499 | |
| 500 } | |
| 501 | |
| 502 //////////////////////////////////////////////// | |
| 503 // check a single dnsbl | |
| 504 // | |
| 505 static status check_single(int ip, char *suffix); | |
| 506 static status check_single(int ip, char *suffix) { | |
| 0 | 507 // make a dns question |
| 508 const u_char *src = (const u_char *)&ip; | |
| 509 if (src[0] == 127) return oksofar; // don't do dns lookups on localhost | |
| 16 | 510 #ifdef NS_MAXDNAME |
| 0 | 511 char question[NS_MAXDNAME]; |
| 16 | 512 #else |
| 513 char question[1000]; | |
| 514 #endif | |
| 8 | 515 snprintf(question, sizeof(question), "%u.%u.%u.%u.%s.", src[3], src[2], src[1], src[0], suffix); |
| 516 // ask the question, if we get an A record it implies a blacklisted ip address | |
| 34 | 517 return (protected_dns_interface(question, false, NULL)) ? reject : oksofar; |
| 8 | 518 } |
| 519 | |
| 520 | |
| 521 //////////////////////////////////////////////// | |
| 522 // check a single dnsbl | |
| 523 // | |
| 524 static status check_single(int ip, DNSBL &bl); | |
| 525 static status check_single(int ip, DNSBL &bl) { | |
| 526 return check_single(ip, bl.suffix); | |
| 0 | 527 } |
| 528 | |
| 529 | |
| 530 //////////////////////////////////////////////// | |
| 531 // check the dnsbls specified for this recipient | |
| 532 // | |
| 533 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist); | |
| 534 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist) { | |
| 535 if (priv.authenticated) return oksofar; | |
| 536 if (!dnsbllp) return oksofar; | |
| 537 DNSBLL &dnsbll = *dnsbllp; | |
| 538 for (DNSBLL::iterator i=dnsbll.begin(); i!=dnsbll.end(); i++) { | |
| 539 DNSBLP dp = *i; // non null by construction | |
| 540 status st; | |
| 541 map<DNSBLP, status>::iterator f = priv.checked.find(dp); | |
| 542 if (f == priv.checked.end()) { | |
| 543 // have not checked this list yet | |
| 8 | 544 st = check_single(priv.ip, *dp); |
| 0 | 545 rejectlist = dp; |
| 546 priv.checked[dp] = st; | |
| 547 } | |
| 548 else { | |
| 549 st = (*f).second; | |
| 550 rejectlist = (*f).first; | |
| 551 } | |
| 552 if (st == reject) return st; | |
| 553 } | |
| 554 return oksofar; | |
| 555 } | |
| 556 | |
| 557 | |
| 558 //////////////////////////////////////////////// | |
| 8 | 559 // check the dnsbls specified for this recipient |
| 560 // | |
| 16 | 561 static status check_hosts(mlfiPriv &priv, char *&host, int &ip); |
| 562 static status check_hosts(mlfiPriv &priv, char *&host, int &ip) { | |
| 8 | 563 CONFIG &dc = *priv.pc; |
| 564 if (!dc.content_suffix) return oksofar; | |
| 565 int count = 0; | |
| 34 | 566 ns_map nameservers; |
| 567 int lim = priv.pc->host_limit; | |
| 24 | 568 for (string_set::iterator i=priv.memory->hosts.begin(); i!=priv.memory->hosts.end(); i++) { |
| 8 | 569 count++; |
| 34 | 570 if ((count > lim) && (lim > 0)) { |
| 571 discard(nameservers); | |
| 572 return reject_host; | |
| 573 } | |
| 35 | 574 host = *i; // a reference into priv.memory->hosts, which will live until this smtp transaction is closed |
| 34 | 575 ip = protected_dns_interface(host, true, &nameservers); |
| 16 | 576 if (debug_syslog) { |
| 577 char buf[200]; | |
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578 if (ip) { |
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579 char adr[sizeof "255.255.255.255"]; |
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580 adr[0] = '\0'; |
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581 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); |
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582 snprintf(buf, sizeof(buf), "host %s found at %s", host, adr); |
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583 } |
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584 else { |
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585 snprintf(buf, sizeof(buf), "host %s not found", host); |
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586 } |
| 16 | 587 my_syslog(buf); |
| 588 } | |
| 8 | 589 if (ip) { |
| 590 status st = check_single(ip, dc.content_suffix); | |
| 34 | 591 if (st == reject) { |
| 592 discard(nameservers); | |
| 593 return st; | |
| 594 } | |
| 8 | 595 } |
| 596 } | |
| 34 | 597 lim *= 4; // allow average of 3 ns per host name |
| 598 for (ns_map::iterator i=nameservers.begin(); i!=nameservers.end(); i++) { | |
| 599 count++; | |
| 600 if ((count > lim) && (lim > 0)) { | |
| 601 discard(nameservers); | |
| 602 return reject_host; | |
| 603 } | |
| 36 | 604 host = (*i).first; // a transient reference that needs to be replaced before we return it |
| 34 | 605 ip = (*i).second; |
| 606 if (!ip) ip = protected_dns_interface(host, false, NULL); | |
| 607 if (debug_syslog) { | |
| 608 char buf[200]; | |
| 609 if (ip) { | |
| 610 char adr[sizeof "255.255.255.255"]; | |
| 611 adr[0] = '\0'; | |
| 612 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
| 613 snprintf(buf, sizeof(buf), "ns %s found at %s", host, adr); | |
| 614 } | |
| 615 else { | |
| 616 snprintf(buf, sizeof(buf), "ns %s not found", host); | |
| 617 } | |
| 618 my_syslog(buf); | |
| 619 } | |
| 620 if (ip) { | |
| 621 status st = check_single(ip, dc.content_suffix); | |
| 622 if (st == reject) { | |
| 36 | 623 host = register_string(priv.memory->hosts, host); // put a copy into priv.memory->hosts, and return that reference |
| 34 | 624 discard(nameservers); |
| 625 return st; | |
| 626 } | |
| 627 } | |
| 628 } | |
| 629 discard(nameservers); | |
| 24 | 630 host = NULL; |
| 26 | 631 int bin = priv.memory->binary_tags; |
| 24 | 632 int bad = priv.memory->bad_html_tags; |
| 34 | 633 lim = priv.pc->tag_limit; |
| 26 | 634 if (bin > bad) return oksofar; // probably .zip or .tar.gz with random content |
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635 if ((bad > lim) && (lim > 0)) return reject_tag; |
| 9 | 636 return oksofar; |
| 8 | 637 } |
| 638 | |
| 639 | |
| 640 //////////////////////////////////////////////// | |
| 0 | 641 // start of sendmail milter interfaces |
| 642 // | |
| 643 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr) | |
| 644 { | |
| 645 // allocate some private memory | |
| 646 mlfiPriv *priv = new mlfiPriv; | |
| 647 if (hostaddr->sa_family == AF_INET) { | |
| 648 priv->ip = ((struct sockaddr_in *)hostaddr)->sin_addr.s_addr; | |
| 649 } | |
| 650 | |
| 651 // save the private data | |
| 652 smfi_setpriv(ctx, (void*)priv); | |
| 653 | |
| 654 // continue processing | |
| 655 return SMFIS_CONTINUE; | |
| 656 } | |
| 657 | |
| 658 sfsistat mlfi_envfrom(SMFICTX *ctx, char **from) | |
| 659 { | |
| 660 mlfiPriv &priv = *MLFIPRIV; | |
| 661 priv.mailaddr = strdup(from[0]); | |
| 662 priv.authenticated = (smfi_getsymval(ctx, "{auth_authen}") != NULL); | |
| 663 return SMFIS_CONTINUE; | |
| 664 } | |
| 665 | |
| 666 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **rcpt) | |
| 667 { | |
| 668 DNSBLP rejectlist = NULL; // list that caused the reject | |
| 669 status st = oksofar; | |
| 670 mlfiPriv &priv = *MLFIPRIV; | |
| 671 CONFIG &dc = *priv.pc; | |
| 672 char *rcptaddr = rcpt[0]; | |
| 673 char *dnsname = lookup(rcptaddr, dc.env_to_dnsbll); | |
| 674 char *fromname = lookup(rcptaddr, dc.env_to_chkfrom); | |
| 675 if ((strcmp(dnsname, BLACK) == 0) || | |
| 676 (strcmp(fromname, BLACK) == 0)) { | |
| 677 st = black; // two options to blacklist this recipient | |
| 678 } | |
| 679 else if (strcmp(fromname, WHITE) == 0) { | |
| 680 st = white; | |
| 681 } | |
| 682 else { | |
| 683 // check an env_from map | |
| 684 string_map *sm = find_from_map(dc, fromname); | |
| 685 if (sm != NULL) { | |
| 686 fromname = lookup(priv.mailaddr, *sm); // returns default if name not in map | |
| 687 if (strcmp(fromname, BLACK) == 0) { | |
| 688 st = black; // blacklist this envelope from value | |
| 689 } | |
| 690 if (strcmp(fromname, WHITE) == 0) { | |
| 691 st = white; // blacklist this envelope from value | |
| 692 } | |
| 693 } | |
| 694 } | |
| 695 if ((st == oksofar) && (strcmp(dnsname, WHITE) != 0)) { | |
| 696 // check dns lists | |
| 697 st = check_dnsbl(priv, find_dnsbll(dc, dnsname), rejectlist); | |
| 698 } | |
| 699 | |
| 700 if (st == reject) { | |
| 701 // reject the recipient based on some dnsbl | |
| 702 char adr[sizeof "255.255.255.255"]; | |
| 703 adr[0] = '\0'; | |
| 8 | 704 inet_ntop(AF_INET, (const u_char *)&priv.ip, adr, sizeof(adr)); |
| 0 | 705 char buf[2000]; |
| 706 snprintf(buf, sizeof(buf), rejectlist->message, adr, adr); | |
| 707 smfi_setreply(ctx, "550", "5.7.1", buf); | |
| 708 return SMFIS_REJECT; | |
| 709 } | |
| 710 else if (st == black) { | |
| 711 // reject the recipient based on blacklisting either from or to | |
| 712 smfi_setreply(ctx, "550", "5.7.1", "no such user"); | |
| 713 return SMFIS_REJECT; | |
| 714 } | |
| 715 else { | |
| 716 // accept the recipient | |
| 8 | 717 if (st == oksofar) { |
| 718 // but remember the non-whites | |
| 12 | 719 register_string(priv.non_whites, rcptaddr); |
| 8 | 720 priv.only_whites = false; |
| 721 } | |
| 722 if (st == white) { | |
| 723 priv.have_whites = true; | |
| 724 } | |
| 0 | 725 return SMFIS_CONTINUE; |
| 726 } | |
| 727 } | |
| 728 | |
| 8 | 729 sfsistat mlfi_body(SMFICTX *ctx, u_char *data, size_t len) |
| 0 | 730 { |
| 731 mlfiPriv &priv = *MLFIPRIV; | |
| 8 | 732 if (priv.authenticated) return SMFIS_CONTINUE; |
| 733 if (priv.only_whites) return SMFIS_CONTINUE; | |
| 734 priv.scanner->scan(data, len); | |
| 11 | 735 return SMFIS_CONTINUE; |
| 8 | 736 } |
| 737 | |
| 738 sfsistat mlfi_eom(SMFICTX *ctx) | |
| 739 { | |
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740 sfsistat rc; |
| 8 | 741 mlfiPriv &priv = *MLFIPRIV; |
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742 char *host = NULL; |
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743 int ip; |
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744 status st; |
| 8 | 745 // process end of message |
| 746 if (priv.authenticated || | |
| 747 priv.only_whites || | |
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748 ((st=check_hosts(priv, host, ip)) == oksofar)) rc = SMFIS_CONTINUE; |
| 8 | 749 else { |
| 750 if (!priv.have_whites) { | |
| 751 // can reject the entire message | |
| 752 char buf[2000]; | |
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753 if (st == reject_tag) { |
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754 // rejected due to excessive bad html tags |
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755 snprintf(buf, sizeof(buf), priv.pc->tag_limit_message); |
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756 } |
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757 else if (st == reject_host) { |
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758 // rejected due to excessive unique host/urls |
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759 snprintf(buf, sizeof(buf), priv.pc->host_limit_message); |
| 24 | 760 } |
| 761 else { | |
| 762 char adr[sizeof "255.255.255.255"]; | |
| 763 adr[0] = '\0'; | |
| 764 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
| 765 snprintf(buf, sizeof(buf), priv.pc->content_message, host, adr); | |
| 766 } | |
| 8 | 767 smfi_setreply(ctx, "550", "5.7.1", buf); |
| 768 rc = SMFIS_REJECT; | |
| 769 } | |
| 770 else { | |
| 771 // need to accept it but remove the recipients that don't want it | |
| 772 for (string_set::iterator i=priv.non_whites.begin(); i!=priv.non_whites.end(); i++) { | |
| 773 char *rcpt = *i; | |
| 774 smfi_delrcpt(ctx, rcpt); | |
| 775 } | |
| 776 rc = SMFIS_CONTINUE; | |
| 777 } | |
| 0 | 778 } |
| 8 | 779 // reset for a new message on the same connection |
| 780 mlfi_abort(ctx); | |
| 781 return rc; | |
| 782 } | |
| 783 | |
| 784 sfsistat mlfi_abort(SMFICTX *ctx) | |
| 785 { | |
| 786 mlfiPriv &priv = *MLFIPRIV; | |
| 787 priv.reset(); | |
| 0 | 788 return SMFIS_CONTINUE; |
| 789 } | |
| 790 | |
| 791 sfsistat mlfi_close(SMFICTX *ctx) | |
| 792 { | |
| 793 mlfiPriv *priv = MLFIPRIV; | |
| 794 if (!priv) return SMFIS_CONTINUE; | |
| 795 delete priv; | |
| 796 smfi_setpriv(ctx, NULL); | |
| 797 return SMFIS_CONTINUE; | |
| 798 } | |
| 799 | |
| 800 struct smfiDesc smfilter = | |
| 801 { | |
| 802 "DNSBL", // filter name | |
| 803 SMFI_VERSION, // version code -- do not change | |
| 804 SMFIF_DELRCPT, // flags | |
| 805 mlfi_connect, // connection info filter | |
| 806 NULL, // SMTP HELO command filter | |
| 807 mlfi_envfrom, // envelope sender filter | |
| 808 mlfi_envrcpt, // envelope recipient filter | |
| 809 NULL, // header filter | |
| 810 NULL, // end of header | |
| 8 | 811 mlfi_body, // body block filter |
| 812 mlfi_eom, // end of message | |
| 813 mlfi_abort, // message aborted | |
| 0 | 814 mlfi_close, // connection cleanup |
| 815 }; | |
| 816 | |
| 817 | |
| 818 static void dumpit(char *name, string_map map); | |
| 819 static void dumpit(char *name, string_map map) { | |
| 9 | 820 fprintf(stdout, "\n"); |
| 0 | 821 for (string_map::iterator i=map.begin(); i!=map.end(); i++) { |
| 9 | 822 fprintf(stdout, "%s %s->%s\n", name, (*i).first, (*i).second); |
| 0 | 823 } |
| 824 } | |
| 825 | |
| 826 | |
| 827 static void dumpit(from_map map); | |
| 828 static void dumpit(from_map map) { | |
| 829 for (from_map::iterator i=map.begin(); i!=map.end(); i++) { | |
| 3 | 830 char buf[2000]; |
| 831 snprintf(buf, sizeof(buf), "envelope from map for %s", (*i).first); | |
| 0 | 832 string_map *sm = (*i).second; |
| 3 | 833 dumpit(buf, *sm); |
| 0 | 834 } |
| 835 } | |
| 836 | |
| 837 | |
| 3 | 838 static void dumpit(CONFIG &dc); |
| 839 static void dumpit(CONFIG &dc) { | |
| 5 | 840 dumpit(dc.env_from); |
| 841 dumpit("envelope to (dnsbl list)", dc.env_to_dnsbll); | |
| 842 dumpit("envelope to (from map)", dc.env_to_chkfrom); | |
| 9 | 843 fprintf(stdout, "\ndnsbls\n"); |
| 0 | 844 for (dnsblp_map::iterator i=dc.dnsbls.begin(); i!=dc.dnsbls.end(); i++) { |
| 9 | 845 fprintf(stdout, "%s %s %s\n", (*i).first, (*i).second->suffix, (*i).second->message); |
| 0 | 846 } |
| 9 | 847 fprintf(stdout, "\ndnsbl_lists\n"); |
| 0 | 848 for (dnsbllp_map::iterator i=dc.dnsblls.begin(); i!=dc.dnsblls.end(); i++) { |
| 849 char *name = (*i).first; | |
| 850 DNSBLL &dl = *((*i).second); | |
| 9 | 851 fprintf(stdout, "%s", name); |
| 0 | 852 for (DNSBLL::iterator j=dl.begin(); j!=dl.end(); j++) { |
| 853 DNSBL &d = **j; | |
| 9 | 854 fprintf(stdout, " %s", d.suffix); |
| 0 | 855 } |
| 9 | 856 fprintf(stdout, "\n"); |
| 0 | 857 } |
| 9 | 858 if (dc.content_suffix) { |
| 859 fprintf(stdout, "\ncontent filtering enabled with %s %s\n", dc.content_suffix, dc.content_message); | |
| 860 } | |
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861 if (dc.host_limit) { |
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862 fprintf(stdout, "\ncontent filtering for host names enabled with limit %d %s\n", dc.host_limit, dc.host_limit_message); |
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863 } |
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864 if (dc.tag_limit) { |
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865 fprintf(stdout, "\ncontent filtering for excessive html tags enabled with limit %d %s\n", dc.tag_limit, dc.tag_limit_message); |
| 24 | 866 } |
| 9 | 867 fprintf(stdout, "\nfiles\n"); |
| 3 | 868 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { |
| 869 char *f = *i; | |
| 9 | 870 fprintf(stdout, "config includes %s\n", f); |
| 3 | 871 } |
| 872 } | |
| 873 | |
| 874 | |
| 875 //////////////////////////////////////////////// | |
| 876 // check for redundant or recursive include files | |
| 877 // | |
| 878 static bool ok_to_include(CONFIG &dc, char *fn); | |
| 879 static bool ok_to_include(CONFIG &dc, char *fn) { | |
| 880 if (!fn) return false; | |
| 881 bool ok = true; | |
| 882 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 883 char *f = *i; | |
| 884 if (strcmp(f, fn) == 0) { | |
| 885 my_syslog("redundant or recursive include file detected"); | |
| 886 ok = false; | |
| 887 break; | |
| 888 } | |
| 889 } | |
| 890 return ok; | |
| 0 | 891 } |
| 892 | |
| 893 | |
| 894 //////////////////////////////////////////////// | |
| 895 // load a single config file | |
| 896 // | |
| 3 | 897 static void load_conf_dcc(CONFIG &dc, char *name, char *fn); |
| 898 static void load_conf_dcc(CONFIG &dc, char *name, char *fn) { | |
| 899 dc.config_files.push_back(fn); | |
| 900 char *list = BLACK; | |
| 901 const int LINE_SIZE = 2000; | |
| 902 ifstream is(fn); | |
| 903 if (is.fail()) return; | |
| 904 char line[LINE_SIZE]; | |
| 905 char *delim = " \t"; | |
| 906 int curline = 0; | |
| 907 while (!is.eof()) { | |
| 908 is.getline(line, LINE_SIZE); | |
| 909 curline++; | |
| 910 int n = strlen(line); | |
| 911 if (!n) continue; | |
| 912 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 913 if (line[0] == '#') continue; | |
| 914 char *head = line; | |
| 915 if (strspn(line, delim) == 0) { | |
| 916 // have a leading ok/many tag to fetch | |
| 917 char *cmd = strtok(line, delim); | |
| 918 if (strcmp(cmd, MANY) == 0) list = BLACK; | |
| 919 else if (strcmp(cmd, OK) == 0) list = WHITE; | |
| 920 head = cmd + strlen(cmd) + 1; | |
| 921 } | |
| 922 char *cmd = strtok(head, delim); | |
| 923 if (!cmd) continue; | |
| 924 if (strcmp(cmd, "env_from") == 0) { | |
| 925 char *from = next_token(delim); | |
| 926 if (from) { | |
| 927 string_map &fm = really_find_from_map(dc, name); | |
| 928 fm[from] = list; | |
| 929 } | |
| 930 } | |
| 931 else if (strcmp(cmd, "env_to") == 0) { | |
| 932 char *to = next_token(delim); | |
| 933 if (to) { | |
| 934 dc.env_to_dnsbll[to] = list; | |
| 935 dc.env_to_chkfrom[to] = list; | |
| 936 } | |
| 937 } | |
| 938 else if (strcmp(cmd, "substitute") == 0) { | |
| 939 char *tag = next_token(delim); | |
| 940 if (tag && (strcmp(tag, "mail_host") == 0)) { | |
| 941 char *from = next_token(delim); | |
| 942 if (from) { | |
| 943 string_map &fm = really_find_from_map(dc, name); | |
| 944 fm[from] = list; | |
| 945 } | |
| 946 } | |
| 947 } | |
| 948 else if (strcmp(cmd, "include") == 0) { | |
| 949 char *fn = next_token(delim); | |
| 950 if (ok_to_include(dc, fn)) { | |
| 951 load_conf_dcc(dc, name, fn); | |
| 952 } | |
| 953 } | |
| 954 | |
| 955 } | |
| 956 is.close(); | |
| 957 } | |
| 958 | |
| 959 | |
| 0 | 960 static void load_conf(CONFIG &dc, char *fn); |
| 961 static void load_conf(CONFIG &dc, char *fn) { | |
| 962 dc.config_files.push_back(fn); | |
| 963 map<char*, int, ltstr> commands; | |
| 28 | 964 enum {dummy, tld, content, hostlimit, htmllimit, htmltag, dnsbl, dnsbll, envfrom, envto, include, includedcc}; |
| 965 commands["tld" ] = tld; | |
| 8 | 966 commands["content" ] = content; |
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967 commands["host_limit" ] = hostlimit; |
| 24 | 968 commands["html_limit" ] = htmllimit; |
| 969 commands["html_tag" ] = htmltag; | |
| 3 | 970 commands["dnsbl" ] = dnsbl; |
| 971 commands["dnsbl_list" ] = dnsbll; | |
| 972 commands["env_from" ] = envfrom; | |
| 973 commands["env_to" ] = envto; | |
| 974 commands["include" ] = include; | |
| 975 commands["include_dcc"] = includedcc; | |
| 0 | 976 const int LINE_SIZE = 2000; |
| 977 ifstream is(fn); | |
| 978 if (is.fail()) return; | |
| 979 char line[LINE_SIZE]; | |
| 980 char orig[LINE_SIZE]; | |
| 981 char *delim = " \t"; | |
| 982 int curline = 0; | |
| 983 while (!is.eof()) { | |
| 984 is.getline(line, LINE_SIZE); | |
| 985 snprintf(orig, sizeof(orig), "%s", line); | |
| 986 curline++; | |
| 987 int n = strlen(line); | |
| 988 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 989 char *cmd = strtok(line, delim); | |
| 990 if (cmd && (cmd[0] != '#') && (cmd[0] != '\0')) { | |
| 991 // have a decent command | |
| 992 bool processed = false; | |
| 993 switch (commands[cmd]) { | |
| 28 | 994 case tld: { |
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995 char *tld = next_token(delim); |
| 28 | 996 if (!tld) break; // no tld value |
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997 dc.tlds.insert(tld); |
| 28 | 998 processed = true; |
| 999 } break; | |
| 1000 | |
| 8 | 1001 case content: { |
| 1002 char *suff = strtok(NULL, delim); | |
| 24 | 1003 if (!suff) break; // no dns suffix |
| 8 | 1004 char *msg = suff + strlen(suff); |
| 1005 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 1006 msg = strchr(msg+1, '\''); | |
| 1007 if (!msg) break; // no reply message template | |
| 1008 msg++; // move over the leading ' | |
| 1009 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 1010 char *last = strchr(msg, '\''); | |
| 1011 if (!last) break; // no trailing quote | |
| 1012 *last = '\0'; // make it a null terminator | |
| 1013 dc.content_suffix = register_string(suff); | |
| 1014 dc.content_message = register_string(msg); | |
| 1015 processed = true; | |
| 1016 } break; | |
| 1017 | |
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1018 case hostlimit: { |
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1019 char *limit = strtok(NULL, delim); |
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1020 if (!limit) break; // no integer limit |
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1021 char *msg = limit + strlen(limit); |
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1022 if ((msg - line) >= strlen(orig)) break; // line ended with the limit |
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1023 msg = strchr(msg+1, '\''); |
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1024 if (!msg) break; // no reply message template |
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1025 msg++; // move over the leading ' |
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1026 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote |
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1027 char *last = strchr(msg, '\''); |
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1028 if (!last) break; // no trailing quote |
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1029 *last = '\0'; // make it a null terminator |
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1030 dc.host_limit = atoi(limit); |
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1031 dc.host_limit_message = register_string(msg); |
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1032 processed = true; |
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1033 } break; |
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1034 |
| 24 | 1035 case htmllimit: { |
| 1036 char *limit = strtok(NULL, delim); | |
| 1037 if (!limit) break; // no integer limit | |
| 1038 char *msg = limit + strlen(limit); | |
| 1039 if ((msg - line) >= strlen(orig)) break; // line ended with the limit | |
| 1040 msg = strchr(msg+1, '\''); | |
| 1041 if (!msg) break; // no reply message template | |
| 1042 msg++; // move over the leading ' | |
| 1043 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 1044 char *last = strchr(msg, '\''); | |
| 1045 if (!last) break; // no trailing quote | |
| 1046 *last = '\0'; // make it a null terminator | |
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1047 dc.tag_limit = atoi(limit); |
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1048 dc.tag_limit_message = register_string(msg); |
| 24 | 1049 processed = true; |
| 1050 } break; | |
| 1051 | |
| 1052 case htmltag: { | |
| 1053 char *tag = next_token(delim); | |
| 1054 if (!tag) break; // no html tag value | |
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1055 dc.html_tags.insert(tag); // base version |
| 26 | 1056 char buf[200]; |
| 1057 snprintf(buf, sizeof(buf), "/%s", tag); | |
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1058 dc.html_tags.insert(register_string(buf)); // leading / |
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1059 snprintf(buf, sizeof(buf), "%s/", tag); |
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1060 dc.html_tags.insert(register_string(buf)); // trailing / |
| 24 | 1061 processed = true; |
| 1062 } break; | |
| 1063 | |
| 0 | 1064 case dnsbl: { |
| 1065 // have a new dnsbl to use | |
| 1066 char *name = next_token(delim); | |
| 1067 if (!name) break; // no name name | |
| 1068 if (find_dnsbl(dc, name)) break; // duplicate entry | |
| 1069 char *suff = strtok(NULL, delim); | |
| 1070 if (!suff) break; // no dns suffic | |
| 1071 char *msg = suff + strlen(suff); | |
| 1072 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 1073 msg = strchr(msg+1, '\''); | |
| 1074 if (!msg) break; // no reply message template | |
| 1075 msg++; // move over the leading ' | |
| 1076 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 1077 char *last = strchr(msg, '\''); | |
| 1078 if (!last) break; // no trailing quote | |
| 1079 *last = '\0'; // make it a null terminator | |
| 1080 dc.dnsbls[name] = new DNSBL(register_string(suff), register_string(msg)); | |
| 1081 processed = true; | |
| 1082 } break; | |
| 1083 | |
| 1084 case dnsbll: { | |
| 1085 // define a new combination of dnsbls | |
| 1086 char *name = next_token(delim); | |
| 1087 if (!name) break; | |
| 1088 if (find_dnsbll(dc, name)) break; // duplicate entry | |
| 1089 char *list = next_token(delim); | |
| 1090 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 1091 DNSBLLP d = new DNSBLL; | |
| 1092 DNSBLP p = find_dnsbl(dc, list); | |
| 1093 if (p) d->push_back(p); | |
| 1094 while (true) { | |
| 1095 list = next_token(delim); | |
| 1096 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 1097 DNSBLP p = find_dnsbl(dc, list); | |
| 1098 if (p) d->push_back(p); | |
| 1099 } | |
| 1100 dc.dnsblls[name] = d; | |
| 1101 processed = true; | |
| 1102 } break; | |
| 1103 | |
| 1104 case envfrom: { | |
| 1105 // add an entry into the named string_map | |
| 1106 char *name = next_token(delim); | |
| 1107 if (!name) break; | |
| 1108 char *from = next_token(delim); | |
| 1109 if (!from) break; | |
| 1110 char *list = next_token(delim); | |
| 1111 if (!list) break; | |
| 1112 if ((strcmp(list, WHITE) == 0) || | |
| 1113 (strcmp(list, BLACK) == 0)) { | |
| 1114 string_map &fm = really_find_from_map(dc, name); | |
| 1115 fm[from] = list; | |
| 1116 processed = true; | |
| 1117 } | |
| 1118 else { | |
| 1119 // list may be the name of a previously defined from_map | |
| 1120 string_map *m = find_from_map(dc, list); | |
| 1121 if (m && (strcmp(list,name) != 0)) { | |
| 1122 string_map &pm = *m; | |
| 1123 string_map &fm = really_find_from_map(dc, name); | |
| 1124 fm.insert(pm.begin(), pm.end()); | |
| 1125 processed = true; | |
| 1126 } | |
| 1127 } | |
| 1128 } break; | |
| 1129 | |
| 1130 case envto: { | |
| 1131 // define the dnsbl_list and env_from maps to use for this recipient | |
| 1132 char *to = next_token(delim); | |
| 1133 if (!to) break; | |
| 1134 char *list = next_token(delim); | |
| 1135 if (!list) break; | |
| 1136 char *from = next_token(delim); | |
| 1137 if (!from) break; | |
| 1138 dc.env_to_dnsbll[to] = list; | |
| 1139 dc.env_to_chkfrom[to] = from; | |
| 1140 processed = true; | |
| 1141 } break; | |
| 1142 | |
| 1143 case include: { | |
| 1144 char *fn = next_token(delim); | |
| 3 | 1145 if (ok_to_include(dc, fn)) { |
| 1146 load_conf(dc, fn); | |
| 1147 processed = true; | |
| 1148 } | |
| 1149 } break; | |
| 1150 | |
| 1151 case includedcc: { | |
| 1152 char *name = next_token(delim); | |
| 1153 if (!name) break; | |
| 1154 char *fn = next_token(delim); | |
| 1155 if (ok_to_include(dc, fn)) { | |
| 1156 load_conf_dcc(dc, name, fn); | |
| 1157 processed = true; | |
| 0 | 1158 } |
| 1159 } break; | |
| 1160 | |
| 1161 default: { | |
| 1162 } break; | |
| 1163 } | |
| 1164 if (!processed) { | |
| 1165 pthread_mutex_lock(&syslog_mutex); | |
| 1166 openlog("dnsbl", LOG_PID, LOG_MAIL); | |
| 1167 syslog(LOG_ERR, "ignoring file %s line %d : %s\n", fn, curline, orig); | |
| 1168 closelog(); | |
| 1169 pthread_mutex_unlock(&syslog_mutex); | |
| 1170 } | |
| 1171 } | |
| 1172 } | |
| 1173 is.close(); | |
| 1174 } | |
| 1175 | |
| 1176 | |
| 1177 //////////////////////////////////////////////// | |
| 1178 // reload the config | |
| 1179 // | |
| 1180 static CONFIG* new_conf(); | |
| 1181 static CONFIG* new_conf() { | |
| 1182 CONFIG *newc = new CONFIG; | |
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1183 pthread_mutex_lock(&config_mutex); |
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1184 newc->generation = generation++; |
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1185 pthread_mutex_unlock(&config_mutex); |
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1186 char buf[200]; |
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1187 snprintf(buf, sizeof(buf), "loading configuration generation %d", newc->generation); |
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1188 my_syslog(buf); |
| 0 | 1189 load_conf(*newc, "dnsbl.conf"); |
| 1190 newc->load_time = time(NULL); | |
| 1191 return newc; | |
| 1192 } | |
| 1193 | |
| 1194 | |
| 1195 //////////////////////////////////////////////// | |
| 1196 // thread to watch the old config files for changes | |
| 1197 // and reload when needed. we also cleanup old | |
| 1198 // configs whose reference count has gone to zero. | |
| 1199 // | |
| 1200 static void* config_loader(void *arg); | |
| 1201 static void* config_loader(void *arg) { | |
| 1202 typedef set<CONFIG *> configp_set; | |
| 1203 configp_set old_configs; | |
| 18 | 1204 while (loader_run) { |
| 0 | 1205 sleep(180); // look for modifications every 3 minutes |
| 18 | 1206 if (!loader_run) break; |
| 0 | 1207 CONFIG &dc = *config; |
| 1208 time_t then = dc.load_time; | |
| 1209 struct stat st; | |
| 1210 bool reload = false; | |
| 1211 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 1212 char *fn = *i; | |
| 1213 if (stat(fn, &st)) reload = true; // file disappeared | |
| 1214 else if (st.st_mtime > then) reload = true; // file modified | |
| 1215 if (reload) break; | |
| 1216 } | |
| 1217 if (reload) { | |
| 1218 CONFIG *newc = new_conf(); | |
| 1219 // replace the global config pointer | |
| 1220 pthread_mutex_lock(&config_mutex); | |
| 1221 CONFIG *old = config; | |
| 1222 config = newc; | |
| 1223 pthread_mutex_unlock(&config_mutex); | |
| 1224 if (old) old_configs.insert(old); | |
| 1225 } | |
| 1226 // now look for old configs with zero ref counts | |
| 1227 for (configp_set::iterator i=old_configs.begin(); i!=old_configs.end(); ) { | |
| 1228 CONFIG *old = *i; | |
| 1229 if (!old->reference_count) { | |
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1230 char buf[200]; |
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1231 snprintf(buf, sizeof(buf), "freeing memory for old configuration generation %d", old->generation); |
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1232 my_syslog(buf); |
| 0 | 1233 delete old; // destructor does all the work |
| 1234 old_configs.erase(i++); | |
| 1235 } | |
| 1236 else i++; | |
| 1237 } | |
| 1238 } | |
| 18 | 1239 return NULL; |
| 0 | 1240 } |
| 1241 | |
| 1242 | |
| 1243 static void usage(char *prog); | |
| 1244 static void usage(char *prog) | |
| 1245 { | |
| 16 | 1246 fprintf(stderr, "Usage: %s [-d] [-c] -p socket-addr [-t timeout]\n", prog); |
| 0 | 1247 fprintf(stderr, "where socket-addr is for the connection to sendmail and should be one of\n"); |
| 1248 fprintf(stderr, " inet:port@local-ip-address\n"); | |
| 1249 fprintf(stderr, " local:local-domain-socket-file-name\n"); | |
| 9 | 1250 fprintf(stderr, "-c will load and dump the config to stdout\n"); |
| 16 | 1251 fprintf(stderr, "-d will add some syslog debug messages\n"); |
| 0 | 1252 } |
| 1253 | |
| 1254 | |
| 1255 int main(int argc, char**argv) | |
| 1256 { | |
| 3 | 1257 bool check = false; |
| 1258 bool setconn = false; | |
| 0 | 1259 int c; |
| 16 | 1260 const char *args = "p:t:hcd"; |
| 0 | 1261 extern char *optarg; |
| 1262 | |
| 1263 // Process command line options | |
| 1264 while ((c = getopt(argc, argv, args)) != -1) { | |
| 1265 switch (c) { | |
| 1266 case 'p': | |
| 1267 if (optarg == NULL || *optarg == '\0') { | |
| 1268 fprintf(stderr, "Illegal conn: %s\n", optarg); | |
| 1269 exit(EX_USAGE); | |
| 1270 } | |
| 1271 if (smfi_setconn(optarg) == MI_FAILURE) { | |
| 1272 fprintf(stderr, "smfi_setconn failed\n"); | |
| 1273 exit(EX_SOFTWARE); | |
| 1274 } | |
| 1275 | |
| 1276 if (strncasecmp(optarg, "unix:", 5) == 0) unlink(optarg + 5); | |
| 1277 else if (strncasecmp(optarg, "local:", 6) == 0) unlink(optarg + 6); | |
| 3 | 1278 setconn = true; |
| 0 | 1279 break; |
| 1280 | |
| 1281 case 't': | |
| 1282 if (optarg == NULL || *optarg == '\0') { | |
| 1283 fprintf(stderr, "Illegal timeout: %s\n", optarg); | |
| 1284 exit(EX_USAGE); | |
| 1285 } | |
| 1286 if (smfi_settimeout(atoi(optarg)) == MI_FAILURE) { | |
| 1287 fprintf(stderr, "smfi_settimeout failed\n"); | |
| 1288 exit(EX_SOFTWARE); | |
| 1289 } | |
| 1290 break; | |
| 1291 | |
| 3 | 1292 case 'c': |
| 1293 check = true; | |
| 1294 break; | |
| 1295 | |
| 16 | 1296 case 'd': |
| 1297 debug_syslog = true; | |
| 1298 break; | |
| 1299 | |
| 0 | 1300 case 'h': |
| 1301 default: | |
| 1302 usage(argv[0]); | |
| 1303 exit(EX_USAGE); | |
| 1304 } | |
| 1305 } | |
| 5 | 1306 |
| 1307 if (check) { | |
| 1308 CONFIG &dc = *new_conf(); | |
| 1309 dumpit(dc); | |
| 1310 return 0; | |
| 1311 } | |
| 1312 | |
| 0 | 1313 if (!setconn) { |
| 1314 fprintf(stderr, "%s: Missing required -p argument\n", argv[0]); | |
| 1315 usage(argv[0]); | |
| 1316 exit(EX_USAGE); | |
| 1317 } | |
| 5 | 1318 |
| 0 | 1319 if (smfi_register(smfilter) == MI_FAILURE) { |
| 1320 fprintf(stderr, "smfi_register failed\n"); | |
| 1321 exit(EX_UNAVAILABLE); | |
| 1322 } | |
| 1323 | |
| 1324 // switch to background mode | |
| 1325 if (daemon(1,0) < 0) { | |
| 1326 fprintf(stderr, "daemon() call failed\n"); | |
| 1327 exit(EX_UNAVAILABLE); | |
| 1328 } | |
| 1329 | |
| 1330 // initialize the thread sync objects | |
| 1331 pthread_mutex_init(&config_mutex, 0); | |
| 1332 pthread_mutex_init(&syslog_mutex, 0); | |
| 1333 pthread_mutex_init(&resolve_mutex, 0); | |
| 1334 | |
| 1335 // load the initial config | |
| 1336 config = new_conf(); | |
| 1337 | |
| 1338 // only create threads after the fork() in daemon | |
| 1339 pthread_t tid; | |
| 1340 if (pthread_create(&tid, 0, config_loader, 0)) | |
| 1341 my_syslog("failed to create config loader thread"); | |
| 1342 if (pthread_detach(tid)) | |
| 1343 my_syslog("failed to detach config loader thread"); | |
| 1344 | |
| 1345 // write the pid | |
| 1346 const char *pidpath = "/var/run/dnsbl.pid"; | |
| 1347 unlink(pidpath); | |
| 1348 FILE *f = fopen(pidpath, "w"); | |
| 1349 if (f) { | |
| 22 | 1350 #ifdef linux |
| 1351 // from a comment in the DCC source code: | |
| 1352 // Linux threads are broken. Signals given the | |
| 1353 // original process are delivered to only the | |
| 1354 // thread that happens to have that PID. The | |
| 1355 // sendmail libmilter thread that needs to hear | |
| 1356 // SIGINT and other signals does not, and that breaks | |
| 1357 // scripts that need to stop milters. | |
| 1358 // However, signaling the process group works. | |
| 0 | 1359 fprintf(f, "-%d\n", (u_int)getpgrp()); |
| 22 | 1360 #else |
| 1361 fprintf(f, "%d\n", (u_int)getpid()); | |
| 1362 #endif | |
| 0 | 1363 fclose(f); |
| 1364 } | |
| 1365 | |
| 18 | 1366 time_t starting = time(NULL); |
| 1367 int rc = smfi_main(); | |
| 22 | 1368 if ((rc != MI_SUCCESS) && (time(NULL) > starting+5*60)) { |
| 18 | 1369 my_syslog("trying to restart after smfi_main()"); |
| 1370 loader_run = false; // eventually the config loader thread will terminate | |
| 1371 execvp(argv[0], argv); | |
| 1372 } | |
| 1373 exit((rc == MI_SUCCESS) ? 0 : EX_UNAVAILABLE); | |
| 0 | 1374 } |
| 8 | 1375 |