Mercurial > dnsbl
annotate src/dnsbl.cpp @ 42:afcf403709ef
updates for 3.2, try to drop root privileges
| author | carl |
|---|---|
| date | Mon, 05 Jul 2004 13:09:44 -0700 |
| parents | d95af8129dfa |
| children | acbe44bbba22 |
| 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> | |
| 42 | 46 #include <sys/un.h> |
| 0 | 47 |
| 48 // needed for thread | |
| 49 #include <pthread.h> | |
| 50 | |
| 51 // needed for std c++ collections | |
| 52 #include <set> | |
| 53 #include <map> | |
| 54 #include <list> | |
| 55 | |
| 56 // for the dns resolver | |
| 57 #include <netinet/in.h> | |
| 58 #include <arpa/nameser.h> | |
| 59 #include <resolv.h> | |
| 60 | |
| 61 // misc stuff needed here | |
| 62 #include <ctype.h> | |
| 63 #include <fstream> | |
| 64 #include <syslog.h> | |
| 42 | 65 #include <pwd.h> |
| 0 | 66 |
| 8 | 67 static char* dnsbl_version="$Id$"; |
| 0 | 68 |
| 8 | 69 #define DEFAULT "default" |
| 70 #define WHITE "white" | |
| 71 #define BLACK "black" | |
| 72 #define OK "ok" | |
| 73 #define MANY "many" | |
| 74 | |
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75 enum status {oksofar, // not rejected yet |
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76 white, // whitelisted by envelope from |
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77 black, // blacklisted by envelope from or to |
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78 reject, // rejected by a dns list |
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79 reject_tag, // too many bad html tags |
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80 reject_host}; // too many hosts/urls in body |
| 1 | 81 |
| 0 | 82 using namespace std; |
| 83 | |
| 84 extern "C" { | |
| 85 #include "libmilter/mfapi.h" | |
| 86 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr); | |
| 87 sfsistat mlfi_envfrom(SMFICTX *ctx, char **argv); | |
| 88 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **argv); | |
| 8 | 89 sfsistat mlfi_body(SMFICTX *ctx, u_char *data, size_t len); |
| 90 sfsistat mlfi_eom(SMFICTX *ctx); | |
| 91 sfsistat mlfi_abort(SMFICTX *ctx); | |
| 0 | 92 sfsistat mlfi_close(SMFICTX *ctx); |
| 93 } | |
| 94 | |
| 95 struct ltstr { | |
| 96 bool operator()(char* s1, char* s2) const { | |
| 97 return strcmp(s1, s2) < 0; | |
| 98 } | |
| 99 }; | |
| 100 | |
| 101 struct DNSBL { | |
| 102 char *suffix; // blacklist suffix like blackholes.five-ten-sg.com | |
| 103 char *message; // error message with one or two %s operators for the ip address replacement | |
| 104 DNSBL(char *s, char *m); | |
| 105 }; | |
| 106 DNSBL::DNSBL(char *s, char *m) { | |
| 107 suffix = s; | |
| 108 message = m; | |
| 109 } | |
| 110 | |
| 111 typedef DNSBL * DNSBLP; | |
| 112 typedef list<DNSBLP> DNSBLL; | |
| 113 typedef DNSBLL * DNSBLLP; | |
| 114 typedef map<char *, char *, ltstr> string_map; | |
| 115 typedef map<char *, string_map *, ltstr> from_map; | |
| 116 typedef map<char *, DNSBLP, ltstr> dnsblp_map; | |
| 117 typedef map<char *, DNSBLLP, ltstr> dnsbllp_map; | |
| 118 typedef set<char *, ltstr> string_set; | |
| 119 typedef list<char *> string_list; | |
| 34 | 120 typedef map<char *, int, ltstr> ns_map; |
| 0 | 121 |
| 122 struct CONFIG { | |
| 123 // the only mutable stuff once it has been loaded from the config file | |
| 124 int reference_count; // protected by the global config_mutex | |
| 125 // all the rest is constant after loading from the config file | |
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126 int generation; |
| 0 | 127 time_t load_time; |
| 128 string_list config_files; | |
| 129 dnsblp_map dnsbls; | |
| 130 dnsbllp_map dnsblls; | |
| 131 from_map env_from; | |
| 132 string_map env_to_dnsbll; // map recipient to a named dnsbll | |
| 133 string_map env_to_chkfrom; // map recipient to a named from map | |
| 8 | 134 char * content_suffix; // for sbl url body filtering |
| 9 | 135 char * content_message; // "" |
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136 char * host_limit_message; // error message for excessive host names |
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137 int host_limit; // limit on host names |
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138 char * tag_limit_message; // error message for excessive bad html tags |
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139 int tag_limit; // limit on bad html tags |
| 24 | 140 string_set html_tags; // set of valid html tags |
| 28 | 141 string_set tlds; // set of valid tld components |
| 0 | 142 CONFIG(); |
| 143 ~CONFIG(); | |
| 144 }; | |
| 145 CONFIG::CONFIG() { | |
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146 reference_count = 0; |
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147 generation = 0; |
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148 load_time = 0; |
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149 content_suffix = NULL; |
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150 content_message = NULL; |
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151 host_limit_message = NULL; |
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152 host_limit = 0; |
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153 tag_limit_message = NULL; |
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154 tag_limit = 0; |
| 0 | 155 } |
| 156 CONFIG::~CONFIG() { | |
| 157 for (dnsblp_map::iterator i=dnsbls.begin(); i!=dnsbls.end(); i++) { | |
| 158 DNSBLP d = (*i).second; | |
| 24 | 159 // delete the underlying DNSBL objects. |
| 0 | 160 delete d; |
| 161 } | |
| 162 for (dnsbllp_map::iterator i=dnsblls.begin(); i!=dnsblls.end(); i++) { | |
| 163 DNSBLLP d = (*i).second; | |
| 24 | 164 // *d is a list of pointers to DNSBL objects, but |
| 165 // the underlying objects have already been deleted above. | |
| 0 | 166 delete d; |
| 167 } | |
| 168 for (from_map::iterator i=env_from.begin(); i!=env_from.end(); i++) { | |
| 169 string_map *d = (*i).second; | |
| 170 delete d; | |
| 171 } | |
| 172 } | |
| 173 | |
| 16 | 174 static bool debug_syslog = false; |
| 18 | 175 static bool loader_run = true; // used to stop the config loader thread |
| 0 | 176 static string_set all_strings; // owns all the strings, only modified by the config loader thread |
| 177 static CONFIG * config = NULL; // protected by the config_mutex | |
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178 static int generation = 0; // protected by the config_mutex |
| 0 | 179 |
| 180 static pthread_mutex_t config_mutex; | |
| 181 static pthread_mutex_t syslog_mutex; | |
| 182 static pthread_mutex_t resolve_mutex; | |
| 183 | |
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184 struct mlfiPriv; |
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185 |
| 0 | 186 |
| 187 //////////////////////////////////////////////// | |
| 34 | 188 // helper to discard the strings and objects held by an ns_map |
| 189 // | |
| 190 static void discard(ns_map &s); | |
| 191 static void discard(ns_map &s) { | |
| 192 for (ns_map::iterator i=s.begin(); i!=s.end(); i++) { | |
| 193 char *x = (*i).first; | |
| 194 free(x); | |
| 195 } | |
| 196 s.clear(); | |
| 197 } | |
| 198 | |
| 199 //////////////////////////////////////////////// | |
| 200 // helper to register a string in an ns_map | |
| 201 // | |
| 202 static void register_string(ns_map &s, char *name); | |
| 203 static void register_string(ns_map &s, char *name) { | |
| 204 ns_map::iterator i = s.find(name); | |
| 205 if (i != s.end()) return; | |
| 206 char *x = strdup(name); | |
| 207 s[x] = 0; | |
| 208 } | |
| 209 | |
| 210 //////////////////////////////////////////////// | |
| 8 | 211 // helper to discard the strings held by a string_set |
| 0 | 212 // |
| 9 | 213 static void discard(string_set &s); |
| 214 static void discard(string_set &s) { | |
| 8 | 215 for (string_set::iterator i=s.begin(); i!=s.end(); i++) { |
| 216 free(*i); | |
| 217 } | |
| 9 | 218 s.clear(); |
| 8 | 219 } |
| 0 | 220 |
| 12 | 221 //////////////////////////////////////////////// |
| 222 // helper to register a string in a string set | |
| 223 // | |
| 224 static char* register_string(string_set &s, char *name); | |
| 225 static char* register_string(string_set &s, char *name) { | |
| 226 string_set::iterator i = s.find(name); | |
| 227 if (i != s.end()) return *i; | |
| 228 char *x = strdup(name); | |
| 229 s.insert(x); | |
| 230 return x; | |
| 231 } | |
| 232 | |
| 16 | 233 //////////////////////////////////////////////// |
| 234 // syslog a message | |
| 235 // | |
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236 static void my_syslog(mlfiPriv *priv, char *text); |
| 16 | 237 |
| 238 | |
| 12 | 239 // include the content scanner |
| 240 #include "scanner.cpp" | |
| 241 | |
| 242 | |
| 0 | 243 //////////////////////////////////////////////// |
| 244 // mail filter private data, held for us by sendmail | |
| 245 // | |
| 246 struct mlfiPriv | |
| 247 { | |
| 8 | 248 // connection specific data |
| 249 CONFIG *pc; // global context with our maps | |
| 250 int ip; // ip4 address of the smtp client | |
| 251 map<DNSBLP, status> checked; // status from those lists | |
| 252 // message specific data | |
| 0 | 253 char *mailaddr; // envelope from value |
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254 char *queueid; // sendmail queue id |
| 0 | 255 bool authenticated; // client authenticated? if so, suppress all dnsbl checks |
| 8 | 256 bool have_whites; // have at least one whitelisted recipient? need to accept content and remove all non-whitelisted recipients if it fails |
| 257 bool only_whites; // every recipient is whitelisted? | |
| 24 | 258 string_set non_whites; // remember the non-whitelisted recipients so we can remove them if need be |
| 259 recorder *memory; // memory for the content scanner | |
| 8 | 260 url_scanner *scanner; // object to handle body scanning |
| 0 | 261 mlfiPriv(); |
| 262 ~mlfiPriv(); | |
| 8 | 263 void reset(bool final = false); // for a new message |
| 0 | 264 }; |
| 265 mlfiPriv::mlfiPriv() { | |
| 266 pthread_mutex_lock(&config_mutex); | |
| 267 pc = config; | |
| 268 pc->reference_count++; | |
| 269 pthread_mutex_unlock(&config_mutex); | |
| 8 | 270 ip = 0; |
| 271 mailaddr = NULL; | |
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272 queueid = NULL; |
| 8 | 273 authenticated = false; |
| 274 have_whites = false; | |
| 275 only_whites = true; | |
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276 memory = new recorder(this, &pc->html_tags, &pc->tlds); |
| 24 | 277 scanner = new url_scanner(memory); |
| 0 | 278 } |
| 279 mlfiPriv::~mlfiPriv() { | |
| 280 pthread_mutex_lock(&config_mutex); | |
| 281 pc->reference_count--; | |
| 282 pthread_mutex_unlock(&config_mutex); | |
| 8 | 283 reset(true); |
| 284 } | |
| 285 void mlfiPriv::reset(bool final) { | |
| 0 | 286 if (mailaddr) free(mailaddr); |
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287 if (queueid) free(queueid); |
| 24 | 288 discard(non_whites); |
| 289 delete memory; | |
| 8 | 290 delete scanner; |
| 291 if (!final) { | |
| 292 mailaddr = NULL; | |
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293 queueid = NULL; |
| 8 | 294 authenticated = false; |
| 295 have_whites = false; | |
| 296 only_whites = true; | |
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297 memory = new recorder(this, &pc->html_tags, &pc->tlds); |
| 24 | 298 scanner = new url_scanner(memory); |
| 8 | 299 } |
| 0 | 300 } |
| 301 | |
| 302 #define MLFIPRIV ((struct mlfiPriv *) smfi_getpriv(ctx)) | |
| 303 | |
| 304 | |
| 305 //////////////////////////////////////////////// | |
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306 // syslog a message |
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307 // |
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308 static void my_syslog(mlfiPriv *priv, char *text) { |
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309 char buf[1000]; |
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310 if (priv) { |
| 42 | 311 snprintf(buf, sizeof(buf), "%s: %s", priv->queueid, text); |
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312 text = buf; |
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313 } |
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314 pthread_mutex_lock(&syslog_mutex); |
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315 openlog("dnsbl", LOG_PID, LOG_MAIL); |
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316 syslog(LOG_NOTICE, "%s", text); |
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317 closelog(); |
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318 pthread_mutex_unlock(&syslog_mutex); |
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319 } |
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320 |
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321 static void my_syslog(char *text); |
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322 static void my_syslog(char *text) { |
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323 my_syslog(NULL, text); |
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324 } |
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325 |
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326 //////////////////////////////////////////////// |
| 0 | 327 // register a global string |
| 328 // | |
| 329 static char* register_string(char *name); | |
| 330 static char* register_string(char *name) { | |
| 12 | 331 return register_string(all_strings, name); |
| 0 | 332 } |
| 333 | |
| 334 | |
| 335 static char* next_token(char *delim); | |
| 336 static char* next_token(char *delim) { | |
| 337 char *name = strtok(NULL, delim); | |
| 338 if (!name) return name; | |
| 339 return register_string(name); | |
| 340 } | |
| 341 | |
| 342 | |
| 343 //////////////////////////////////////////////// | |
| 344 // lookup an email address in the env_from or env_to maps | |
| 345 // | |
| 346 static char* lookup1(char *email, string_map map); | |
| 347 static char* lookup1(char *email, string_map map) { | |
| 348 string_map::iterator i = map.find(email); | |
| 349 if (i != map.end()) return (*i).second; | |
| 350 char *x = strchr(email, '@'); | |
| 351 if (!x) return DEFAULT; | |
| 352 x++; | |
| 353 i = map.find(x); | |
| 354 if (i != map.end()) return (*i).second; | |
| 355 return DEFAULT; | |
| 356 } | |
| 357 | |
| 358 | |
| 359 //////////////////////////////////////////////// | |
| 360 // lookup an email address in the env_from or env_to maps | |
| 361 // this email address is passed in from sendmail, and will | |
| 362 // always be enclosed in <>. It may have mixed case, just | |
| 363 // as the mail client sent it. | |
| 364 // | |
| 365 static char* lookup(char* email, string_map map); | |
| 366 static char* lookup(char* email, string_map map) { | |
| 367 int n = strlen(email)-2; | |
| 368 if (n < 1) return DEFAULT; // malformed | |
| 369 char *key = strdup(email+1); | |
| 370 key[n] = '\0'; | |
| 371 for (int i=0; i<n; i++) key[i] = tolower(key[i]); | |
| 372 char *rc = lookup1(key, map); | |
| 373 free(key); | |
| 374 return rc; | |
| 375 } | |
| 376 | |
| 377 | |
| 378 //////////////////////////////////////////////// | |
| 379 // find the dnsbl with a specific name | |
| 380 // | |
| 381 static DNSBLP find_dnsbl(CONFIG &dc, char *name); | |
| 382 static DNSBLP find_dnsbl(CONFIG &dc, char *name) { | |
| 383 dnsblp_map::iterator i = dc.dnsbls.find(name); | |
| 384 if (i == dc.dnsbls.end()) return NULL; | |
| 385 return (*i).second; | |
| 386 } | |
| 387 | |
| 388 | |
| 389 //////////////////////////////////////////////// | |
| 390 // find the dnsbll with a specific name | |
| 391 // | |
| 392 static DNSBLLP find_dnsbll(CONFIG &dc, char *name); | |
| 393 static DNSBLLP find_dnsbll(CONFIG &dc, char *name) { | |
| 394 dnsbllp_map::iterator i = dc.dnsblls.find(name); | |
| 395 if (i == dc.dnsblls.end()) return NULL; | |
| 396 return (*i).second; | |
| 397 } | |
| 398 | |
| 399 | |
| 400 //////////////////////////////////////////////// | |
| 401 // find the envfrom map with a specific name | |
| 402 // | |
| 403 static string_map* find_from_map(CONFIG &dc, char *name); | |
| 404 static string_map* find_from_map(CONFIG &dc, char *name) { | |
| 405 from_map::iterator i = dc.env_from.find(name); | |
| 406 if (i == dc.env_from.end()) return NULL; | |
| 407 return (*i).second; | |
| 408 } | |
| 409 | |
| 410 | |
| 411 static string_map& really_find_from_map(CONFIG &dc, char *name); | |
| 412 static string_map& really_find_from_map(CONFIG &dc, char *name) { | |
| 413 string_map *sm = find_from_map(dc, name); | |
| 414 if (!sm) { | |
| 415 sm = new string_map; | |
| 416 dc.env_from[name] = sm; | |
| 417 } | |
| 418 return *sm; | |
| 419 } | |
| 420 | |
| 421 | |
| 422 //////////////////////////////////////////////// | |
| 8 | 423 // |
| 424 // ask a dns question and get an A record answer - we don't try | |
| 425 // very hard, just using the default resolver retry settings. | |
| 426 // If we cannot get an answer, we just accept the mail. The | |
| 427 // caller must ensure thread safety. | |
| 428 // | |
| 0 | 429 // |
| 34 | 430 static int dns_interface(char *question, bool maybe_ip, ns_map *nameservers); |
| 431 static int dns_interface(char *question, bool maybe_ip, ns_map *nameservers) { | |
| 16 | 432 #ifdef NS_PACKETSZ |
| 8 | 433 u_char answer[NS_PACKETSZ]; |
| 434 int length = res_search(question, ns_c_in, ns_t_a, answer, sizeof(answer)); | |
|
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435 if (length >= 0) { // no error yet |
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436 // parse the answer |
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437 ns_msg handle; |
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438 ns_rr rr; |
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439 if (ns_initparse(answer, length, &handle) == 0) { |
| 34 | 440 // look for ns names |
| 441 if (nameservers) { | |
| 442 ns_map &ns = *nameservers; | |
| 443 int rrnum = 0; | |
| 444 while (ns_parserr(&handle, ns_s_ns, rrnum++, &rr) == 0) { | |
| 445 if (ns_rr_type(rr) == ns_t_ns) { | |
| 446 char nam[NS_MAXDNAME+1]; | |
| 447 char *n = nam; | |
| 448 const u_char *p = ns_rr_rdata(rr); | |
| 449 while (((n-nam) < NS_MAXDNAME) && ((p-answer) < length) && *p) { | |
| 450 size_t s = *(p++); | |
| 451 if (s > 191) { | |
| 452 // compression pointer | |
| 453 s = (s-192)*256 + *(p++); | |
| 454 if (s >= length) break; // pointer outside bounds of answer | |
| 455 p = answer + s; | |
| 456 s = *(p++); | |
| 457 } | |
| 458 if (s > 0) { | |
| 459 if ((n-nam) >= (NS_MAXDNAME-s)) break; // destination would overflow name buffer | |
| 460 if ((p-answer) >= (length-s)) break; // source outside bounds of answer | |
| 461 memcpy(n, p, s); | |
| 462 n += s; | |
| 463 p += s; | |
| 464 *(n++) = '.'; | |
| 465 } | |
| 466 } | |
| 36 | 467 if (n-nam) n--; // remove trailing . |
| 468 *n = '\0'; // null terminate it | |
| 34 | 469 register_string(ns, nam); // ns host to lookup later |
| 470 } | |
| 471 } | |
| 472 rrnum = 0; | |
| 473 while (ns_parserr(&handle, ns_s_ar, rrnum++, &rr) == 0) { | |
| 474 if (ns_rr_type(rr) == ns_t_a) { | |
| 475 char* nam = (char*)ns_rr_name(rr); | |
| 476 ns_map::iterator i = ns.find(nam); | |
| 477 if (i != ns.end()) { | |
| 478 // we want this ip address | |
| 479 int address; | |
| 480 memcpy(&address, ns_rr_rdata(rr), sizeof(address)); | |
| 481 ns[nam] = address; | |
| 482 } | |
| 483 } | |
| 484 } | |
| 485 } | |
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486 int rrnum = 0; |
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487 while (ns_parserr(&handle, ns_s_an, rrnum++, &rr) == 0) { |
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488 if (ns_rr_type(rr) == ns_t_a) { |
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489 int address; |
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490 memcpy(&address, ns_rr_rdata(rr), sizeof(address)); |
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491 return address; |
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492 } |
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493 } |
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494 } |
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495 } |
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496 if (maybe_ip) { |
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497 // might be a bare ip address |
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498 in_addr ip; |
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499 if (inet_aton(question, &ip)) { |
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500 return ip.s_addr; |
| 8 | 501 } |
| 502 } | |
| 503 return 0; | |
| 16 | 504 #else |
| 505 struct hostent *host = gethostbyname(question); | |
| 506 if (!host) return 0; | |
| 507 if (host->h_addrtype != AF_INET) return 0; | |
| 508 int address; | |
| 509 memcpy(&address, host->h_addr, sizeof(address)); | |
| 510 return address; | |
| 511 #endif | |
| 8 | 512 } |
| 513 | |
| 34 | 514 static int protected_dns_interface(char *question, bool maybe_ip, ns_map *nameservers); |
| 515 static int protected_dns_interface(char *question, bool maybe_ip, ns_map *nameservers) { | |
| 8 | 516 int ans; |
| 517 pthread_mutex_lock(&resolve_mutex); | |
| 34 | 518 ans = dns_interface(question, maybe_ip, nameservers); |
| 8 | 519 pthread_mutex_unlock(&resolve_mutex); |
| 520 return ans; | |
| 521 | |
| 522 } | |
| 523 | |
| 524 //////////////////////////////////////////////// | |
| 525 // check a single dnsbl | |
| 526 // | |
| 527 static status check_single(int ip, char *suffix); | |
| 528 static status check_single(int ip, char *suffix) { | |
| 0 | 529 // make a dns question |
| 530 const u_char *src = (const u_char *)&ip; | |
| 531 if (src[0] == 127) return oksofar; // don't do dns lookups on localhost | |
| 16 | 532 #ifdef NS_MAXDNAME |
| 0 | 533 char question[NS_MAXDNAME]; |
| 16 | 534 #else |
| 535 char question[1000]; | |
| 536 #endif | |
| 8 | 537 snprintf(question, sizeof(question), "%u.%u.%u.%u.%s.", src[3], src[2], src[1], src[0], suffix); |
| 538 // ask the question, if we get an A record it implies a blacklisted ip address | |
| 34 | 539 return (protected_dns_interface(question, false, NULL)) ? reject : oksofar; |
| 8 | 540 } |
| 541 | |
| 542 | |
| 543 //////////////////////////////////////////////// | |
| 544 // check a single dnsbl | |
| 545 // | |
| 546 static status check_single(int ip, DNSBL &bl); | |
| 547 static status check_single(int ip, DNSBL &bl) { | |
| 548 return check_single(ip, bl.suffix); | |
| 0 | 549 } |
| 550 | |
| 551 | |
| 552 //////////////////////////////////////////////// | |
| 553 // check the dnsbls specified for this recipient | |
| 554 // | |
| 555 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist); | |
| 556 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist) { | |
| 557 if (priv.authenticated) return oksofar; | |
| 558 if (!dnsbllp) return oksofar; | |
| 559 DNSBLL &dnsbll = *dnsbllp; | |
| 560 for (DNSBLL::iterator i=dnsbll.begin(); i!=dnsbll.end(); i++) { | |
| 561 DNSBLP dp = *i; // non null by construction | |
| 562 status st; | |
| 563 map<DNSBLP, status>::iterator f = priv.checked.find(dp); | |
| 564 if (f == priv.checked.end()) { | |
| 565 // have not checked this list yet | |
| 8 | 566 st = check_single(priv.ip, *dp); |
| 0 | 567 rejectlist = dp; |
| 568 priv.checked[dp] = st; | |
| 569 } | |
| 570 else { | |
| 571 st = (*f).second; | |
| 572 rejectlist = (*f).first; | |
| 573 } | |
| 574 if (st == reject) return st; | |
| 575 } | |
| 576 return oksofar; | |
| 577 } | |
| 578 | |
| 579 | |
| 580 //////////////////////////////////////////////// | |
| 8 | 581 // check the dnsbls specified for this recipient |
| 582 // | |
| 16 | 583 static status check_hosts(mlfiPriv &priv, char *&host, int &ip); |
| 584 static status check_hosts(mlfiPriv &priv, char *&host, int &ip) { | |
| 8 | 585 CONFIG &dc = *priv.pc; |
| 586 if (!dc.content_suffix) return oksofar; | |
| 587 int count = 0; | |
| 34 | 588 ns_map nameservers; |
| 589 int lim = priv.pc->host_limit; | |
| 24 | 590 for (string_set::iterator i=priv.memory->hosts.begin(); i!=priv.memory->hosts.end(); i++) { |
| 8 | 591 count++; |
| 34 | 592 if ((count > lim) && (lim > 0)) { |
| 593 discard(nameservers); | |
| 594 return reject_host; | |
| 595 } | |
| 35 | 596 host = *i; // a reference into priv.memory->hosts, which will live until this smtp transaction is closed |
| 34 | 597 ip = protected_dns_interface(host, true, &nameservers); |
| 16 | 598 if (debug_syslog) { |
| 599 char buf[200]; | |
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600 if (ip) { |
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601 char adr[sizeof "255.255.255.255"]; |
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602 adr[0] = '\0'; |
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603 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); |
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604 snprintf(buf, sizeof(buf), "host %s found at %s", host, adr); |
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605 } |
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606 else { |
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607 snprintf(buf, sizeof(buf), "host %s not found", host); |
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608 } |
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609 my_syslog(&priv, buf); |
| 16 | 610 } |
| 8 | 611 if (ip) { |
| 612 status st = check_single(ip, dc.content_suffix); | |
| 34 | 613 if (st == reject) { |
| 614 discard(nameservers); | |
| 615 return st; | |
| 616 } | |
| 8 | 617 } |
| 618 } | |
| 34 | 619 lim *= 4; // allow average of 3 ns per host name |
| 620 for (ns_map::iterator i=nameservers.begin(); i!=nameservers.end(); i++) { | |
| 621 count++; | |
| 622 if ((count > lim) && (lim > 0)) { | |
| 623 discard(nameservers); | |
| 624 return reject_host; | |
| 625 } | |
| 36 | 626 host = (*i).first; // a transient reference that needs to be replaced before we return it |
| 34 | 627 ip = (*i).second; |
| 628 if (!ip) ip = protected_dns_interface(host, false, NULL); | |
| 629 if (debug_syslog) { | |
| 630 char buf[200]; | |
| 631 if (ip) { | |
| 632 char adr[sizeof "255.255.255.255"]; | |
| 633 adr[0] = '\0'; | |
| 634 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
| 635 snprintf(buf, sizeof(buf), "ns %s found at %s", host, adr); | |
| 636 } | |
| 637 else { | |
| 638 snprintf(buf, sizeof(buf), "ns %s not found", host); | |
| 639 } | |
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640 my_syslog(&priv, buf); |
| 34 | 641 } |
| 642 if (ip) { | |
| 643 status st = check_single(ip, dc.content_suffix); | |
| 644 if (st == reject) { | |
| 36 | 645 host = register_string(priv.memory->hosts, host); // put a copy into priv.memory->hosts, and return that reference |
| 34 | 646 discard(nameservers); |
| 647 return st; | |
| 648 } | |
| 649 } | |
| 650 } | |
| 651 discard(nameservers); | |
| 24 | 652 host = NULL; |
| 26 | 653 int bin = priv.memory->binary_tags; |
| 24 | 654 int bad = priv.memory->bad_html_tags; |
| 34 | 655 lim = priv.pc->tag_limit; |
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656 if (3*bin > bad) return oksofar; // probably .zip or .tar.gz with random content |
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657 if ((bad > lim) && (lim > 0)) return reject_tag; |
| 9 | 658 return oksofar; |
| 8 | 659 } |
| 660 | |
| 661 | |
| 662 //////////////////////////////////////////////// | |
| 0 | 663 // start of sendmail milter interfaces |
| 664 // | |
| 665 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr) | |
| 666 { | |
| 667 // allocate some private memory | |
| 668 mlfiPriv *priv = new mlfiPriv; | |
| 669 if (hostaddr->sa_family == AF_INET) { | |
| 670 priv->ip = ((struct sockaddr_in *)hostaddr)->sin_addr.s_addr; | |
| 671 } | |
| 672 | |
| 673 // save the private data | |
| 674 smfi_setpriv(ctx, (void*)priv); | |
| 675 | |
| 676 // continue processing | |
| 677 return SMFIS_CONTINUE; | |
| 678 } | |
| 679 | |
| 680 sfsistat mlfi_envfrom(SMFICTX *ctx, char **from) | |
| 681 { | |
| 682 mlfiPriv &priv = *MLFIPRIV; | |
| 683 priv.mailaddr = strdup(from[0]); | |
| 684 priv.authenticated = (smfi_getsymval(ctx, "{auth_authen}") != NULL); | |
| 685 return SMFIS_CONTINUE; | |
| 686 } | |
| 687 | |
| 688 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **rcpt) | |
| 689 { | |
| 690 DNSBLP rejectlist = NULL; // list that caused the reject | |
| 691 status st = oksofar; | |
| 692 mlfiPriv &priv = *MLFIPRIV; | |
| 693 CONFIG &dc = *priv.pc; | |
| 42 | 694 if (!priv.queueid) priv.queueid = strdup(smfi_getsymval(ctx, "i")); |
| 0 | 695 char *rcptaddr = rcpt[0]; |
| 696 char *dnsname = lookup(rcptaddr, dc.env_to_dnsbll); | |
| 697 char *fromname = lookup(rcptaddr, dc.env_to_chkfrom); | |
| 698 if ((strcmp(dnsname, BLACK) == 0) || | |
| 699 (strcmp(fromname, BLACK) == 0)) { | |
| 700 st = black; // two options to blacklist this recipient | |
| 701 } | |
| 702 else if (strcmp(fromname, WHITE) == 0) { | |
| 703 st = white; | |
| 704 } | |
| 705 else { | |
| 706 // check an env_from map | |
| 707 string_map *sm = find_from_map(dc, fromname); | |
| 708 if (sm != NULL) { | |
| 709 fromname = lookup(priv.mailaddr, *sm); // returns default if name not in map | |
| 710 if (strcmp(fromname, BLACK) == 0) { | |
| 711 st = black; // blacklist this envelope from value | |
| 712 } | |
| 713 if (strcmp(fromname, WHITE) == 0) { | |
| 714 st = white; // blacklist this envelope from value | |
| 715 } | |
| 716 } | |
| 717 } | |
| 718 if ((st == oksofar) && (strcmp(dnsname, WHITE) != 0)) { | |
| 719 // check dns lists | |
| 720 st = check_dnsbl(priv, find_dnsbll(dc, dnsname), rejectlist); | |
| 721 } | |
| 722 | |
| 723 if (st == reject) { | |
| 724 // reject the recipient based on some dnsbl | |
| 725 char adr[sizeof "255.255.255.255"]; | |
| 726 adr[0] = '\0'; | |
| 8 | 727 inet_ntop(AF_INET, (const u_char *)&priv.ip, adr, sizeof(adr)); |
| 0 | 728 char buf[2000]; |
| 729 snprintf(buf, sizeof(buf), rejectlist->message, adr, adr); | |
| 730 smfi_setreply(ctx, "550", "5.7.1", buf); | |
| 731 return SMFIS_REJECT; | |
| 732 } | |
| 733 else if (st == black) { | |
| 734 // reject the recipient based on blacklisting either from or to | |
| 735 smfi_setreply(ctx, "550", "5.7.1", "no such user"); | |
| 736 return SMFIS_REJECT; | |
| 737 } | |
| 738 else { | |
| 739 // accept the recipient | |
| 8 | 740 if (st == oksofar) { |
| 741 // but remember the non-whites | |
| 12 | 742 register_string(priv.non_whites, rcptaddr); |
| 8 | 743 priv.only_whites = false; |
| 744 } | |
| 745 if (st == white) { | |
| 746 priv.have_whites = true; | |
| 747 } | |
| 0 | 748 return SMFIS_CONTINUE; |
| 749 } | |
| 750 } | |
| 751 | |
| 8 | 752 sfsistat mlfi_body(SMFICTX *ctx, u_char *data, size_t len) |
| 0 | 753 { |
| 754 mlfiPriv &priv = *MLFIPRIV; | |
| 8 | 755 if (priv.authenticated) return SMFIS_CONTINUE; |
| 756 if (priv.only_whites) return SMFIS_CONTINUE; | |
| 757 priv.scanner->scan(data, len); | |
| 11 | 758 return SMFIS_CONTINUE; |
| 8 | 759 } |
| 760 | |
| 761 sfsistat mlfi_eom(SMFICTX *ctx) | |
| 762 { | |
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763 sfsistat rc; |
| 8 | 764 mlfiPriv &priv = *MLFIPRIV; |
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765 char *host = NULL; |
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766 int ip; |
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767 status st; |
| 8 | 768 // process end of message |
| 769 if (priv.authenticated || | |
| 770 priv.only_whites || | |
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771 ((st=check_hosts(priv, host, ip)) == oksofar)) rc = SMFIS_CONTINUE; |
| 8 | 772 else { |
| 773 if (!priv.have_whites) { | |
| 774 // can reject the entire message | |
| 775 char buf[2000]; | |
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776 if (st == reject_tag) { |
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777 // rejected due to excessive bad html tags |
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778 snprintf(buf, sizeof(buf), priv.pc->tag_limit_message); |
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779 } |
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780 else if (st == reject_host) { |
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781 // rejected due to excessive unique host/urls |
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782 snprintf(buf, sizeof(buf), priv.pc->host_limit_message); |
| 24 | 783 } |
| 784 else { | |
| 785 char adr[sizeof "255.255.255.255"]; | |
| 786 adr[0] = '\0'; | |
| 787 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
| 788 snprintf(buf, sizeof(buf), priv.pc->content_message, host, adr); | |
| 789 } | |
| 8 | 790 smfi_setreply(ctx, "550", "5.7.1", buf); |
| 791 rc = SMFIS_REJECT; | |
| 792 } | |
| 793 else { | |
| 794 // need to accept it but remove the recipients that don't want it | |
| 795 for (string_set::iterator i=priv.non_whites.begin(); i!=priv.non_whites.end(); i++) { | |
| 796 char *rcpt = *i; | |
| 797 smfi_delrcpt(ctx, rcpt); | |
| 798 } | |
| 799 rc = SMFIS_CONTINUE; | |
| 800 } | |
| 0 | 801 } |
| 8 | 802 // reset for a new message on the same connection |
| 803 mlfi_abort(ctx); | |
| 804 return rc; | |
| 805 } | |
| 806 | |
| 807 sfsistat mlfi_abort(SMFICTX *ctx) | |
| 808 { | |
| 809 mlfiPriv &priv = *MLFIPRIV; | |
| 810 priv.reset(); | |
| 0 | 811 return SMFIS_CONTINUE; |
| 812 } | |
| 813 | |
| 814 sfsistat mlfi_close(SMFICTX *ctx) | |
| 815 { | |
| 816 mlfiPriv *priv = MLFIPRIV; | |
| 817 if (!priv) return SMFIS_CONTINUE; | |
| 818 delete priv; | |
| 819 smfi_setpriv(ctx, NULL); | |
| 820 return SMFIS_CONTINUE; | |
| 821 } | |
| 822 | |
| 823 struct smfiDesc smfilter = | |
| 824 { | |
| 825 "DNSBL", // filter name | |
| 826 SMFI_VERSION, // version code -- do not change | |
| 827 SMFIF_DELRCPT, // flags | |
| 828 mlfi_connect, // connection info filter | |
| 829 NULL, // SMTP HELO command filter | |
| 830 mlfi_envfrom, // envelope sender filter | |
| 831 mlfi_envrcpt, // envelope recipient filter | |
| 832 NULL, // header filter | |
| 833 NULL, // end of header | |
| 8 | 834 mlfi_body, // body block filter |
| 835 mlfi_eom, // end of message | |
| 836 mlfi_abort, // message aborted | |
| 0 | 837 mlfi_close, // connection cleanup |
| 838 }; | |
| 839 | |
| 840 | |
| 841 static void dumpit(char *name, string_map map); | |
| 842 static void dumpit(char *name, string_map map) { | |
| 9 | 843 fprintf(stdout, "\n"); |
| 0 | 844 for (string_map::iterator i=map.begin(); i!=map.end(); i++) { |
| 9 | 845 fprintf(stdout, "%s %s->%s\n", name, (*i).first, (*i).second); |
| 0 | 846 } |
| 847 } | |
| 848 | |
| 849 | |
| 850 static void dumpit(from_map map); | |
| 851 static void dumpit(from_map map) { | |
| 852 for (from_map::iterator i=map.begin(); i!=map.end(); i++) { | |
| 3 | 853 char buf[2000]; |
| 854 snprintf(buf, sizeof(buf), "envelope from map for %s", (*i).first); | |
| 0 | 855 string_map *sm = (*i).second; |
| 3 | 856 dumpit(buf, *sm); |
| 0 | 857 } |
| 858 } | |
| 859 | |
| 860 | |
| 3 | 861 static void dumpit(CONFIG &dc); |
| 862 static void dumpit(CONFIG &dc) { | |
| 5 | 863 dumpit(dc.env_from); |
| 864 dumpit("envelope to (dnsbl list)", dc.env_to_dnsbll); | |
| 865 dumpit("envelope to (from map)", dc.env_to_chkfrom); | |
| 9 | 866 fprintf(stdout, "\ndnsbls\n"); |
| 0 | 867 for (dnsblp_map::iterator i=dc.dnsbls.begin(); i!=dc.dnsbls.end(); i++) { |
| 9 | 868 fprintf(stdout, "%s %s %s\n", (*i).first, (*i).second->suffix, (*i).second->message); |
| 0 | 869 } |
| 9 | 870 fprintf(stdout, "\ndnsbl_lists\n"); |
| 0 | 871 for (dnsbllp_map::iterator i=dc.dnsblls.begin(); i!=dc.dnsblls.end(); i++) { |
| 872 char *name = (*i).first; | |
| 873 DNSBLL &dl = *((*i).second); | |
| 9 | 874 fprintf(stdout, "%s", name); |
| 0 | 875 for (DNSBLL::iterator j=dl.begin(); j!=dl.end(); j++) { |
| 876 DNSBL &d = **j; | |
| 9 | 877 fprintf(stdout, " %s", d.suffix); |
| 0 | 878 } |
| 9 | 879 fprintf(stdout, "\n"); |
| 0 | 880 } |
| 9 | 881 if (dc.content_suffix) { |
| 882 fprintf(stdout, "\ncontent filtering enabled with %s %s\n", dc.content_suffix, dc.content_message); | |
| 883 } | |
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884 if (dc.host_limit) { |
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885 fprintf(stdout, "\ncontent filtering for host names enabled with limit %d %s\n", dc.host_limit, dc.host_limit_message); |
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886 } |
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887 if (dc.tag_limit) { |
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888 fprintf(stdout, "\ncontent filtering for excessive html tags enabled with limit %d %s\n", dc.tag_limit, dc.tag_limit_message); |
| 24 | 889 } |
| 9 | 890 fprintf(stdout, "\nfiles\n"); |
| 3 | 891 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { |
| 892 char *f = *i; | |
| 9 | 893 fprintf(stdout, "config includes %s\n", f); |
| 3 | 894 } |
| 895 } | |
| 896 | |
| 897 | |
| 898 //////////////////////////////////////////////// | |
| 899 // check for redundant or recursive include files | |
| 900 // | |
| 901 static bool ok_to_include(CONFIG &dc, char *fn); | |
| 902 static bool ok_to_include(CONFIG &dc, char *fn) { | |
| 903 if (!fn) return false; | |
| 904 bool ok = true; | |
| 905 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 906 char *f = *i; | |
| 907 if (strcmp(f, fn) == 0) { | |
| 908 my_syslog("redundant or recursive include file detected"); | |
| 909 ok = false; | |
| 910 break; | |
| 911 } | |
| 912 } | |
| 913 return ok; | |
| 0 | 914 } |
| 915 | |
| 916 | |
| 917 //////////////////////////////////////////////// | |
| 918 // load a single config file | |
| 919 // | |
| 3 | 920 static void load_conf_dcc(CONFIG &dc, char *name, char *fn); |
| 921 static void load_conf_dcc(CONFIG &dc, char *name, char *fn) { | |
| 922 ifstream is(fn); | |
| 40 | 923 if (is.fail()) { |
| 924 char buf[1000]; | |
| 925 snprintf(buf, sizeof(buf), "include file %s not found", fn); | |
| 926 my_syslog(buf); | |
| 927 return; | |
| 928 } | |
| 39 | 929 dc.config_files.push_back(fn); |
| 930 const int LINE_SIZE = 2000; | |
| 3 | 931 char line[LINE_SIZE]; |
| 39 | 932 char *list = BLACK; |
| 3 | 933 char *delim = " \t"; |
| 934 int curline = 0; | |
| 935 while (!is.eof()) { | |
| 936 is.getline(line, LINE_SIZE); | |
| 937 curline++; | |
| 938 int n = strlen(line); | |
| 939 if (!n) continue; | |
| 940 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 941 if (line[0] == '#') continue; | |
| 942 char *head = line; | |
| 943 if (strspn(line, delim) == 0) { | |
| 944 // have a leading ok/many tag to fetch | |
| 945 char *cmd = strtok(line, delim); | |
| 946 if (strcmp(cmd, MANY) == 0) list = BLACK; | |
| 947 else if (strcmp(cmd, OK) == 0) list = WHITE; | |
| 948 head = cmd + strlen(cmd) + 1; | |
| 949 } | |
| 950 char *cmd = strtok(head, delim); | |
| 951 if (!cmd) continue; | |
| 952 if (strcmp(cmd, "env_from") == 0) { | |
| 953 char *from = next_token(delim); | |
| 954 if (from) { | |
| 955 string_map &fm = really_find_from_map(dc, name); | |
| 956 fm[from] = list; | |
| 957 } | |
| 958 } | |
| 959 else if (strcmp(cmd, "env_to") == 0) { | |
| 960 char *to = next_token(delim); | |
| 961 if (to) { | |
| 962 dc.env_to_dnsbll[to] = list; | |
| 963 dc.env_to_chkfrom[to] = list; | |
| 964 } | |
| 965 } | |
| 966 else if (strcmp(cmd, "substitute") == 0) { | |
| 967 char *tag = next_token(delim); | |
| 968 if (tag && (strcmp(tag, "mail_host") == 0)) { | |
| 969 char *from = next_token(delim); | |
| 970 if (from) { | |
| 971 string_map &fm = really_find_from_map(dc, name); | |
| 972 fm[from] = list; | |
| 973 } | |
| 974 } | |
| 975 } | |
| 976 else if (strcmp(cmd, "include") == 0) { | |
| 977 char *fn = next_token(delim); | |
| 978 if (ok_to_include(dc, fn)) { | |
| 979 load_conf_dcc(dc, name, fn); | |
| 980 } | |
| 981 } | |
| 982 | |
| 983 } | |
| 984 is.close(); | |
| 985 } | |
| 986 | |
| 987 | |
| 0 | 988 static void load_conf(CONFIG &dc, char *fn); |
| 989 static void load_conf(CONFIG &dc, char *fn) { | |
| 39 | 990 ifstream is(fn); |
| 40 | 991 if (is.fail()) { |
| 992 char buf[1000]; | |
| 993 snprintf(buf, sizeof(buf), "include file %s not found", fn); | |
| 994 my_syslog(buf); | |
| 995 return; | |
| 996 } | |
| 0 | 997 dc.config_files.push_back(fn); |
| 998 map<char*, int, ltstr> commands; | |
| 28 | 999 enum {dummy, tld, content, hostlimit, htmllimit, htmltag, dnsbl, dnsbll, envfrom, envto, include, includedcc}; |
| 1000 commands["tld" ] = tld; | |
| 8 | 1001 commands["content" ] = content; |
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1002 commands["host_limit" ] = hostlimit; |
| 24 | 1003 commands["html_limit" ] = htmllimit; |
| 1004 commands["html_tag" ] = htmltag; | |
| 3 | 1005 commands["dnsbl" ] = dnsbl; |
| 1006 commands["dnsbl_list" ] = dnsbll; | |
| 1007 commands["env_from" ] = envfrom; | |
| 1008 commands["env_to" ] = envto; | |
| 1009 commands["include" ] = include; | |
| 1010 commands["include_dcc"] = includedcc; | |
| 0 | 1011 const int LINE_SIZE = 2000; |
| 1012 char line[LINE_SIZE]; | |
| 1013 char orig[LINE_SIZE]; | |
| 1014 char *delim = " \t"; | |
| 1015 int curline = 0; | |
| 1016 while (!is.eof()) { | |
| 1017 is.getline(line, LINE_SIZE); | |
| 1018 snprintf(orig, sizeof(orig), "%s", line); | |
| 1019 curline++; | |
| 1020 int n = strlen(line); | |
| 1021 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 1022 char *cmd = strtok(line, delim); | |
| 1023 if (cmd && (cmd[0] != '#') && (cmd[0] != '\0')) { | |
| 1024 // have a decent command | |
| 1025 bool processed = false; | |
| 1026 switch (commands[cmd]) { | |
| 28 | 1027 case tld: { |
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1028 char *tld = next_token(delim); |
| 28 | 1029 if (!tld) break; // no tld value |
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1030 dc.tlds.insert(tld); |
| 28 | 1031 processed = true; |
| 1032 } break; | |
| 1033 | |
| 8 | 1034 case content: { |
| 1035 char *suff = strtok(NULL, delim); | |
| 24 | 1036 if (!suff) break; // no dns suffix |
| 8 | 1037 char *msg = suff + strlen(suff); |
| 1038 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 1039 msg = strchr(msg+1, '\''); | |
| 1040 if (!msg) break; // no reply message template | |
| 1041 msg++; // move over the leading ' | |
| 1042 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 1043 char *last = strchr(msg, '\''); | |
| 1044 if (!last) break; // no trailing quote | |
| 1045 *last = '\0'; // make it a null terminator | |
| 1046 dc.content_suffix = register_string(suff); | |
| 1047 dc.content_message = register_string(msg); | |
| 1048 processed = true; | |
| 1049 } break; | |
| 1050 | |
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1051 case hostlimit: { |
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1052 char *limit = strtok(NULL, delim); |
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1053 if (!limit) break; // no integer limit |
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1054 char *msg = limit + strlen(limit); |
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1055 if ((msg - line) >= strlen(orig)) break; // line ended with the limit |
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1056 msg = strchr(msg+1, '\''); |
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1057 if (!msg) break; // no reply message template |
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1058 msg++; // move over the leading ' |
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1059 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote |
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1060 char *last = strchr(msg, '\''); |
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1061 if (!last) break; // no trailing quote |
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1062 *last = '\0'; // make it a null terminator |
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1063 dc.host_limit = atoi(limit); |
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1064 dc.host_limit_message = register_string(msg); |
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1065 processed = true; |
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1066 } break; |
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1067 |
| 24 | 1068 case htmllimit: { |
| 1069 char *limit = strtok(NULL, delim); | |
| 1070 if (!limit) break; // no integer limit | |
| 1071 char *msg = limit + strlen(limit); | |
| 1072 if ((msg - line) >= strlen(orig)) break; // line ended with the limit | |
| 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 | |
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1080 dc.tag_limit = atoi(limit); |
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1081 dc.tag_limit_message = register_string(msg); |
| 24 | 1082 processed = true; |
| 1083 } break; | |
| 1084 | |
| 1085 case htmltag: { | |
| 1086 char *tag = next_token(delim); | |
| 1087 if (!tag) break; // no html tag value | |
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1088 dc.html_tags.insert(tag); // base version |
| 26 | 1089 char buf[200]; |
| 1090 snprintf(buf, sizeof(buf), "/%s", tag); | |
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1091 dc.html_tags.insert(register_string(buf)); // leading / |
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1092 snprintf(buf, sizeof(buf), "%s/", tag); |
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1093 dc.html_tags.insert(register_string(buf)); // trailing / |
| 24 | 1094 processed = true; |
| 1095 } break; | |
| 1096 | |
| 0 | 1097 case dnsbl: { |
| 1098 // have a new dnsbl to use | |
| 1099 char *name = next_token(delim); | |
| 1100 if (!name) break; // no name name | |
| 1101 if (find_dnsbl(dc, name)) break; // duplicate entry | |
| 1102 char *suff = strtok(NULL, delim); | |
| 1103 if (!suff) break; // no dns suffic | |
| 1104 char *msg = suff + strlen(suff); | |
| 1105 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 1106 msg = strchr(msg+1, '\''); | |
| 1107 if (!msg) break; // no reply message template | |
| 1108 msg++; // move over the leading ' | |
| 1109 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 1110 char *last = strchr(msg, '\''); | |
| 1111 if (!last) break; // no trailing quote | |
| 1112 *last = '\0'; // make it a null terminator | |
| 1113 dc.dnsbls[name] = new DNSBL(register_string(suff), register_string(msg)); | |
| 1114 processed = true; | |
| 1115 } break; | |
| 1116 | |
| 1117 case dnsbll: { | |
| 1118 // define a new combination of dnsbls | |
| 1119 char *name = next_token(delim); | |
| 1120 if (!name) break; | |
| 1121 if (find_dnsbll(dc, name)) break; // duplicate entry | |
| 1122 char *list = next_token(delim); | |
| 1123 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 1124 DNSBLLP d = new DNSBLL; | |
| 1125 DNSBLP p = find_dnsbl(dc, list); | |
| 1126 if (p) d->push_back(p); | |
| 1127 while (true) { | |
| 1128 list = next_token(delim); | |
| 1129 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 1130 DNSBLP p = find_dnsbl(dc, list); | |
| 1131 if (p) d->push_back(p); | |
| 1132 } | |
| 1133 dc.dnsblls[name] = d; | |
| 1134 processed = true; | |
| 1135 } break; | |
| 1136 | |
| 1137 case envfrom: { | |
| 1138 // add an entry into the named string_map | |
| 1139 char *name = next_token(delim); | |
| 1140 if (!name) break; | |
| 1141 char *from = next_token(delim); | |
| 1142 if (!from) break; | |
| 1143 char *list = next_token(delim); | |
| 1144 if (!list) break; | |
| 1145 if ((strcmp(list, WHITE) == 0) || | |
| 1146 (strcmp(list, BLACK) == 0)) { | |
| 1147 string_map &fm = really_find_from_map(dc, name); | |
| 1148 fm[from] = list; | |
| 1149 processed = true; | |
| 1150 } | |
| 1151 else { | |
| 1152 // list may be the name of a previously defined from_map | |
| 1153 string_map *m = find_from_map(dc, list); | |
| 1154 if (m && (strcmp(list,name) != 0)) { | |
| 1155 string_map &pm = *m; | |
| 1156 string_map &fm = really_find_from_map(dc, name); | |
| 1157 fm.insert(pm.begin(), pm.end()); | |
| 1158 processed = true; | |
| 1159 } | |
| 1160 } | |
| 1161 } break; | |
| 1162 | |
| 1163 case envto: { | |
| 1164 // define the dnsbl_list and env_from maps to use for this recipient | |
| 1165 char *to = next_token(delim); | |
| 1166 if (!to) break; | |
| 1167 char *list = next_token(delim); | |
| 1168 if (!list) break; | |
| 1169 char *from = next_token(delim); | |
| 1170 if (!from) break; | |
| 1171 dc.env_to_dnsbll[to] = list; | |
| 1172 dc.env_to_chkfrom[to] = from; | |
| 1173 processed = true; | |
| 1174 } break; | |
| 1175 | |
| 1176 case include: { | |
| 1177 char *fn = next_token(delim); | |
| 3 | 1178 if (ok_to_include(dc, fn)) { |
| 1179 load_conf(dc, fn); | |
| 1180 processed = true; | |
| 1181 } | |
| 1182 } break; | |
| 1183 | |
| 1184 case includedcc: { | |
| 1185 char *name = next_token(delim); | |
| 1186 if (!name) break; | |
| 1187 char *fn = next_token(delim); | |
| 1188 if (ok_to_include(dc, fn)) { | |
| 1189 load_conf_dcc(dc, name, fn); | |
| 1190 processed = true; | |
| 0 | 1191 } |
| 1192 } break; | |
| 1193 | |
| 1194 default: { | |
| 1195 } break; | |
| 1196 } | |
| 1197 if (!processed) { | |
| 1198 pthread_mutex_lock(&syslog_mutex); | |
| 1199 openlog("dnsbl", LOG_PID, LOG_MAIL); | |
| 1200 syslog(LOG_ERR, "ignoring file %s line %d : %s\n", fn, curline, orig); | |
| 1201 closelog(); | |
| 1202 pthread_mutex_unlock(&syslog_mutex); | |
| 1203 } | |
| 1204 } | |
| 1205 } | |
| 1206 is.close(); | |
| 1207 } | |
| 1208 | |
| 1209 | |
| 1210 //////////////////////////////////////////////// | |
| 1211 // reload the config | |
| 1212 // | |
| 1213 static CONFIG* new_conf(); | |
| 1214 static CONFIG* new_conf() { | |
| 1215 CONFIG *newc = new CONFIG; | |
|
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1216 pthread_mutex_lock(&config_mutex); |
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1217 newc->generation = generation++; |
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1218 pthread_mutex_unlock(&config_mutex); |
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1219 char buf[200]; |
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1220 snprintf(buf, sizeof(buf), "loading configuration generation %d", newc->generation); |
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1221 my_syslog(buf); |
| 0 | 1222 load_conf(*newc, "dnsbl.conf"); |
| 1223 newc->load_time = time(NULL); | |
| 1224 return newc; | |
| 1225 } | |
| 1226 | |
| 1227 | |
| 1228 //////////////////////////////////////////////// | |
| 1229 // thread to watch the old config files for changes | |
| 1230 // and reload when needed. we also cleanup old | |
| 1231 // configs whose reference count has gone to zero. | |
| 1232 // | |
| 1233 static void* config_loader(void *arg); | |
| 1234 static void* config_loader(void *arg) { | |
| 1235 typedef set<CONFIG *> configp_set; | |
| 1236 configp_set old_configs; | |
| 18 | 1237 while (loader_run) { |
| 0 | 1238 sleep(180); // look for modifications every 3 minutes |
| 18 | 1239 if (!loader_run) break; |
| 0 | 1240 CONFIG &dc = *config; |
| 1241 time_t then = dc.load_time; | |
| 1242 struct stat st; | |
| 1243 bool reload = false; | |
| 1244 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 1245 char *fn = *i; | |
| 1246 if (stat(fn, &st)) reload = true; // file disappeared | |
| 1247 else if (st.st_mtime > then) reload = true; // file modified | |
| 1248 if (reload) break; | |
| 1249 } | |
| 1250 if (reload) { | |
| 1251 CONFIG *newc = new_conf(); | |
| 1252 // replace the global config pointer | |
| 1253 pthread_mutex_lock(&config_mutex); | |
| 1254 CONFIG *old = config; | |
| 1255 config = newc; | |
| 1256 pthread_mutex_unlock(&config_mutex); | |
| 1257 if (old) old_configs.insert(old); | |
| 1258 } | |
| 1259 // now look for old configs with zero ref counts | |
| 1260 for (configp_set::iterator i=old_configs.begin(); i!=old_configs.end(); ) { | |
| 1261 CONFIG *old = *i; | |
| 1262 if (!old->reference_count) { | |
|
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1263 char buf[200]; |
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1264 snprintf(buf, sizeof(buf), "freeing memory for old configuration generation %d", old->generation); |
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1265 my_syslog(buf); |
| 0 | 1266 delete old; // destructor does all the work |
| 1267 old_configs.erase(i++); | |
| 1268 } | |
| 1269 else i++; | |
| 1270 } | |
| 1271 } | |
| 18 | 1272 return NULL; |
| 0 | 1273 } |
| 1274 | |
| 1275 | |
| 1276 static void usage(char *prog); | |
| 1277 static void usage(char *prog) | |
| 1278 { | |
| 16 | 1279 fprintf(stderr, "Usage: %s [-d] [-c] -p socket-addr [-t timeout]\n", prog); |
| 0 | 1280 fprintf(stderr, "where socket-addr is for the connection to sendmail and should be one of\n"); |
| 1281 fprintf(stderr, " inet:port@local-ip-address\n"); | |
| 1282 fprintf(stderr, " local:local-domain-socket-file-name\n"); | |
| 9 | 1283 fprintf(stderr, "-c will load and dump the config to stdout\n"); |
| 16 | 1284 fprintf(stderr, "-d will add some syslog debug messages\n"); |
| 0 | 1285 } |
| 1286 | |
| 1287 | |
| 42 | 1288 |
| 1289 static void setup_socket(char *sock); | |
| 1290 static void setup_socket(char *sock) { | |
| 1291 unlink(sock); | |
| 1292 sockaddr_un addr; | |
| 1293 memset(&addr, '\0', sizeof addr); | |
| 1294 addr.sun_family = AF_UNIX; | |
| 1295 strncpy(addr.sun_path, sock, sizeof(addr.sun_path)-1); | |
| 1296 int s = socket(AF_UNIX, SOCK_STREAM, 0); | |
| 1297 bind(s, (sockaddr*)&addr, sizeof(addr)); | |
| 1298 close(s); | |
| 1299 } | |
| 1300 | |
| 1301 | |
| 0 | 1302 int main(int argc, char**argv) |
| 1303 { | |
| 3 | 1304 bool check = false; |
| 1305 bool setconn = false; | |
| 0 | 1306 int c; |
| 16 | 1307 const char *args = "p:t:hcd"; |
| 0 | 1308 extern char *optarg; |
| 1309 | |
| 1310 // Process command line options | |
| 1311 while ((c = getopt(argc, argv, args)) != -1) { | |
| 1312 switch (c) { | |
| 1313 case 'p': | |
| 1314 if (optarg == NULL || *optarg == '\0') { | |
| 1315 fprintf(stderr, "Illegal conn: %s\n", optarg); | |
| 1316 exit(EX_USAGE); | |
| 1317 } | |
| 1318 if (smfi_setconn(optarg) == MI_FAILURE) { | |
| 1319 fprintf(stderr, "smfi_setconn failed\n"); | |
| 1320 exit(EX_SOFTWARE); | |
| 1321 } | |
| 1322 | |
| 42 | 1323 if (strncasecmp(optarg, "unix:", 5) == 0) setup_socket(optarg + 5); |
| 1324 else if (strncasecmp(optarg, "local:", 6) == 0) setup_socket(optarg + 6); | |
| 3 | 1325 setconn = true; |
| 0 | 1326 break; |
| 1327 | |
| 1328 case 't': | |
| 1329 if (optarg == NULL || *optarg == '\0') { | |
| 1330 fprintf(stderr, "Illegal timeout: %s\n", optarg); | |
| 1331 exit(EX_USAGE); | |
| 1332 } | |
| 1333 if (smfi_settimeout(atoi(optarg)) == MI_FAILURE) { | |
| 1334 fprintf(stderr, "smfi_settimeout failed\n"); | |
| 1335 exit(EX_SOFTWARE); | |
| 1336 } | |
| 1337 break; | |
| 1338 | |
| 3 | 1339 case 'c': |
| 1340 check = true; | |
| 1341 break; | |
| 1342 | |
| 16 | 1343 case 'd': |
| 1344 debug_syslog = true; | |
| 1345 break; | |
| 1346 | |
| 0 | 1347 case 'h': |
| 1348 default: | |
| 1349 usage(argv[0]); | |
| 1350 exit(EX_USAGE); | |
| 1351 } | |
| 1352 } | |
| 5 | 1353 |
| 1354 if (check) { | |
| 1355 CONFIG &dc = *new_conf(); | |
| 1356 dumpit(dc); | |
| 1357 return 0; | |
| 1358 } | |
| 1359 | |
| 0 | 1360 if (!setconn) { |
| 1361 fprintf(stderr, "%s: Missing required -p argument\n", argv[0]); | |
| 1362 usage(argv[0]); | |
| 1363 exit(EX_USAGE); | |
| 1364 } | |
| 5 | 1365 |
| 0 | 1366 if (smfi_register(smfilter) == MI_FAILURE) { |
| 1367 fprintf(stderr, "smfi_register failed\n"); | |
| 1368 exit(EX_UNAVAILABLE); | |
| 1369 } | |
| 1370 | |
| 1371 // switch to background mode | |
| 1372 if (daemon(1,0) < 0) { | |
| 1373 fprintf(stderr, "daemon() call failed\n"); | |
| 1374 exit(EX_UNAVAILABLE); | |
| 1375 } | |
| 1376 | |
| 1377 // initialize the thread sync objects | |
| 1378 pthread_mutex_init(&config_mutex, 0); | |
| 1379 pthread_mutex_init(&syslog_mutex, 0); | |
| 1380 pthread_mutex_init(&resolve_mutex, 0); | |
| 1381 | |
| 1382 // load the initial config | |
| 1383 config = new_conf(); | |
| 1384 | |
| 1385 // only create threads after the fork() in daemon | |
| 1386 pthread_t tid; | |
| 1387 if (pthread_create(&tid, 0, config_loader, 0)) | |
| 1388 my_syslog("failed to create config loader thread"); | |
| 1389 if (pthread_detach(tid)) | |
| 1390 my_syslog("failed to detach config loader thread"); | |
| 1391 | |
| 1392 // write the pid | |
| 1393 const char *pidpath = "/var/run/dnsbl.pid"; | |
| 1394 unlink(pidpath); | |
| 1395 FILE *f = fopen(pidpath, "w"); | |
| 1396 if (f) { | |
| 22 | 1397 #ifdef linux |
| 1398 // from a comment in the DCC source code: | |
| 1399 // Linux threads are broken. Signals given the | |
| 1400 // original process are delivered to only the | |
| 1401 // thread that happens to have that PID. The | |
| 1402 // sendmail libmilter thread that needs to hear | |
| 1403 // SIGINT and other signals does not, and that breaks | |
| 1404 // scripts that need to stop milters. | |
| 1405 // However, signaling the process group works. | |
| 0 | 1406 fprintf(f, "-%d\n", (u_int)getpgrp()); |
| 22 | 1407 #else |
| 1408 fprintf(f, "%d\n", (u_int)getpid()); | |
| 1409 #endif | |
| 0 | 1410 fclose(f); |
| 1411 } | |
| 1412 | |
| 42 | 1413 |
| 1414 // drop root privs | |
| 1415 struct passwd *pw = getpwnam("dnsbl"); | |
| 1416 if (pw) { | |
| 1417 if (setuid(pw->pw_uid) == -1) { | |
| 1418 my_syslog("failed to switch to user dnsbl"); | |
| 1419 } | |
| 1420 } | |
| 1421 | |
| 18 | 1422 time_t starting = time(NULL); |
| 1423 int rc = smfi_main(); | |
| 22 | 1424 if ((rc != MI_SUCCESS) && (time(NULL) > starting+5*60)) { |
| 18 | 1425 my_syslog("trying to restart after smfi_main()"); |
| 1426 loader_run = false; // eventually the config loader thread will terminate | |
| 1427 execvp(argv[0], argv); | |
| 1428 } | |
| 1429 exit((rc == MI_SUCCESS) ? 0 : EX_UNAVAILABLE); | |
| 0 | 1430 } |
| 8 | 1431 |