Mercurial > dnsbl
annotate src/dnsbl.cpp @ 48:5ef10dc14457
properly drop root privs
| author | carl |
|---|---|
| date | Fri, 09 Jul 2004 13:57:59 -0700 |
| parents | 66c66a6ee65f |
| children | c2371bb6cf84 |
| 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; | |
| 44 | 119 typedef set<int> int_set; |
| 0 | 120 typedef list<char *> string_list; |
| 34 | 121 typedef map<char *, int, ltstr> ns_map; |
| 0 | 122 |
| 123 struct CONFIG { | |
| 124 // the only mutable stuff once it has been loaded from the config file | |
| 125 int reference_count; // protected by the global config_mutex | |
| 126 // all the rest is constant after loading from the config file | |
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127 int generation; |
| 0 | 128 time_t load_time; |
| 129 string_list config_files; | |
| 130 dnsblp_map dnsbls; | |
| 131 dnsbllp_map dnsblls; | |
| 132 from_map env_from; | |
| 133 string_map env_to_dnsbll; // map recipient to a named dnsbll | |
| 134 string_map env_to_chkfrom; // map recipient to a named from map | |
| 8 | 135 char * content_suffix; // for sbl url body filtering |
| 9 | 136 char * content_message; // "" |
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137 char * host_limit_message; // error message for excessive host names |
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138 int host_limit; // limit on host names |
| 44 | 139 bool host_random; // pick a random selection of host names rather than error for excessive hosts |
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140 char * tag_limit_message; // error message for excessive bad html tags |
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141 int tag_limit; // limit on bad html tags |
| 24 | 142 string_set html_tags; // set of valid html tags |
| 28 | 143 string_set tlds; // set of valid tld components |
| 0 | 144 CONFIG(); |
| 145 ~CONFIG(); | |
| 146 }; | |
| 147 CONFIG::CONFIG() { | |
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148 reference_count = 0; |
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149 generation = 0; |
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150 load_time = 0; |
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151 content_suffix = NULL; |
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152 content_message = NULL; |
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153 host_limit_message = NULL; |
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154 host_limit = 0; |
| 44 | 155 host_random = false; |
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156 tag_limit_message = NULL; |
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157 tag_limit = 0; |
| 0 | 158 } |
| 159 CONFIG::~CONFIG() { | |
| 160 for (dnsblp_map::iterator i=dnsbls.begin(); i!=dnsbls.end(); i++) { | |
| 161 DNSBLP d = (*i).second; | |
| 24 | 162 // delete the underlying DNSBL objects. |
| 0 | 163 delete d; |
| 164 } | |
| 165 for (dnsbllp_map::iterator i=dnsblls.begin(); i!=dnsblls.end(); i++) { | |
| 166 DNSBLLP d = (*i).second; | |
| 24 | 167 // *d is a list of pointers to DNSBL objects, but |
| 168 // the underlying objects have already been deleted above. | |
| 0 | 169 delete d; |
| 170 } | |
| 171 for (from_map::iterator i=env_from.begin(); i!=env_from.end(); i++) { | |
| 172 string_map *d = (*i).second; | |
| 173 delete d; | |
| 174 } | |
| 175 } | |
| 176 | |
| 16 | 177 static bool debug_syslog = false; |
| 18 | 178 static bool loader_run = true; // used to stop the config loader thread |
| 0 | 179 static string_set all_strings; // owns all the strings, only modified by the config loader thread |
| 180 static CONFIG * config = NULL; // protected by the config_mutex | |
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181 static int generation = 0; // protected by the config_mutex |
| 0 | 182 |
| 183 static pthread_mutex_t config_mutex; | |
| 184 static pthread_mutex_t syslog_mutex; | |
| 185 static pthread_mutex_t resolve_mutex; | |
| 186 | |
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187 struct mlfiPriv; |
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188 |
| 0 | 189 |
| 190 //////////////////////////////////////////////// | |
| 34 | 191 // helper to discard the strings and objects held by an ns_map |
| 192 // | |
| 193 static void discard(ns_map &s); | |
| 194 static void discard(ns_map &s) { | |
| 195 for (ns_map::iterator i=s.begin(); i!=s.end(); i++) { | |
| 196 char *x = (*i).first; | |
| 197 free(x); | |
| 198 } | |
| 199 s.clear(); | |
| 200 } | |
| 201 | |
| 202 //////////////////////////////////////////////// | |
| 203 // helper to register a string in an ns_map | |
| 204 // | |
| 205 static void register_string(ns_map &s, char *name); | |
| 206 static void register_string(ns_map &s, char *name) { | |
| 207 ns_map::iterator i = s.find(name); | |
| 208 if (i != s.end()) return; | |
| 209 char *x = strdup(name); | |
| 210 s[x] = 0; | |
| 211 } | |
| 212 | |
| 213 //////////////////////////////////////////////// | |
| 8 | 214 // helper to discard the strings held by a string_set |
| 0 | 215 // |
| 9 | 216 static void discard(string_set &s); |
| 217 static void discard(string_set &s) { | |
| 8 | 218 for (string_set::iterator i=s.begin(); i!=s.end(); i++) { |
| 219 free(*i); | |
| 220 } | |
| 9 | 221 s.clear(); |
| 8 | 222 } |
| 0 | 223 |
| 12 | 224 //////////////////////////////////////////////// |
| 225 // helper to register a string in a string set | |
| 226 // | |
| 227 static char* register_string(string_set &s, char *name); | |
| 228 static char* register_string(string_set &s, char *name) { | |
| 229 string_set::iterator i = s.find(name); | |
| 230 if (i != s.end()) return *i; | |
| 231 char *x = strdup(name); | |
| 232 s.insert(x); | |
| 233 return x; | |
| 234 } | |
| 235 | |
| 16 | 236 //////////////////////////////////////////////// |
| 237 // syslog a message | |
| 238 // | |
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239 static void my_syslog(mlfiPriv *priv, char *text); |
| 16 | 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 |
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257 char *queueid; // sendmail queue id |
| 0 | 258 bool authenticated; // client authenticated? if so, suppress all dnsbl checks |
| 8 | 259 bool have_whites; // have at least one whitelisted recipient? need to accept content and remove all non-whitelisted recipients if it fails |
| 260 bool only_whites; // every recipient is whitelisted? | |
| 24 | 261 string_set non_whites; // remember the non-whitelisted recipients so we can remove them if need be |
| 262 recorder *memory; // memory for the content scanner | |
| 8 | 263 url_scanner *scanner; // object to handle body scanning |
| 0 | 264 mlfiPriv(); |
| 265 ~mlfiPriv(); | |
| 8 | 266 void reset(bool final = false); // for a new message |
| 0 | 267 }; |
| 268 mlfiPriv::mlfiPriv() { | |
| 269 pthread_mutex_lock(&config_mutex); | |
| 270 pc = config; | |
| 271 pc->reference_count++; | |
| 272 pthread_mutex_unlock(&config_mutex); | |
| 8 | 273 ip = 0; |
| 274 mailaddr = NULL; | |
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275 queueid = NULL; |
| 8 | 276 authenticated = false; |
| 277 have_whites = false; | |
| 278 only_whites = true; | |
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279 memory = new recorder(this, &pc->html_tags, &pc->tlds); |
| 24 | 280 scanner = new url_scanner(memory); |
| 0 | 281 } |
| 282 mlfiPriv::~mlfiPriv() { | |
| 283 pthread_mutex_lock(&config_mutex); | |
| 284 pc->reference_count--; | |
| 285 pthread_mutex_unlock(&config_mutex); | |
| 8 | 286 reset(true); |
| 287 } | |
| 288 void mlfiPriv::reset(bool final) { | |
| 0 | 289 if (mailaddr) free(mailaddr); |
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290 if (queueid) free(queueid); |
| 24 | 291 discard(non_whites); |
| 292 delete memory; | |
| 8 | 293 delete scanner; |
| 294 if (!final) { | |
| 295 mailaddr = NULL; | |
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296 queueid = NULL; |
| 8 | 297 authenticated = false; |
| 298 have_whites = false; | |
| 299 only_whites = true; | |
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300 memory = new recorder(this, &pc->html_tags, &pc->tlds); |
| 24 | 301 scanner = new url_scanner(memory); |
| 8 | 302 } |
| 0 | 303 } |
| 304 | |
| 305 #define MLFIPRIV ((struct mlfiPriv *) smfi_getpriv(ctx)) | |
| 306 | |
| 307 | |
| 308 //////////////////////////////////////////////// | |
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309 // syslog a message |
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310 // |
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311 static void my_syslog(mlfiPriv *priv, char *text) { |
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312 char buf[1000]; |
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313 if (priv) { |
| 42 | 314 snprintf(buf, sizeof(buf), "%s: %s", priv->queueid, text); |
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315 text = buf; |
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316 } |
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317 pthread_mutex_lock(&syslog_mutex); |
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318 openlog("dnsbl", LOG_PID, LOG_MAIL); |
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319 syslog(LOG_NOTICE, "%s", text); |
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320 closelog(); |
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321 pthread_mutex_unlock(&syslog_mutex); |
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322 } |
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323 |
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324 static void my_syslog(char *text); |
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325 static void my_syslog(char *text) { |
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326 my_syslog(NULL, text); |
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327 } |
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328 |
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329 //////////////////////////////////////////////// |
| 0 | 330 // register a global string |
| 331 // | |
| 332 static char* register_string(char *name); | |
| 333 static char* register_string(char *name) { | |
| 12 | 334 return register_string(all_strings, name); |
| 0 | 335 } |
| 336 | |
| 337 | |
| 338 static char* next_token(char *delim); | |
| 339 static char* next_token(char *delim) { | |
| 340 char *name = strtok(NULL, delim); | |
| 341 if (!name) return name; | |
| 342 return register_string(name); | |
| 343 } | |
| 344 | |
| 345 | |
| 346 //////////////////////////////////////////////// | |
| 347 // lookup an email address in the env_from or env_to maps | |
| 348 // | |
| 349 static char* lookup1(char *email, string_map map); | |
| 350 static char* lookup1(char *email, string_map map) { | |
| 351 string_map::iterator i = map.find(email); | |
| 352 if (i != map.end()) return (*i).second; | |
| 353 char *x = strchr(email, '@'); | |
| 354 if (!x) return DEFAULT; | |
| 355 x++; | |
| 356 i = map.find(x); | |
| 357 if (i != map.end()) return (*i).second; | |
| 358 return DEFAULT; | |
| 359 } | |
| 360 | |
| 361 | |
| 362 //////////////////////////////////////////////// | |
| 363 // lookup an email address in the env_from or env_to maps | |
| 364 // this email address is passed in from sendmail, and will | |
| 365 // always be enclosed in <>. It may have mixed case, just | |
| 366 // as the mail client sent it. | |
| 367 // | |
| 368 static char* lookup(char* email, string_map map); | |
| 369 static char* lookup(char* email, string_map map) { | |
| 370 int n = strlen(email)-2; | |
| 371 if (n < 1) return DEFAULT; // malformed | |
| 372 char *key = strdup(email+1); | |
| 373 key[n] = '\0'; | |
| 374 for (int i=0; i<n; i++) key[i] = tolower(key[i]); | |
| 375 char *rc = lookup1(key, map); | |
| 376 free(key); | |
| 377 return rc; | |
| 378 } | |
| 379 | |
| 380 | |
| 381 //////////////////////////////////////////////// | |
| 382 // find the dnsbl with a specific name | |
| 383 // | |
| 384 static DNSBLP find_dnsbl(CONFIG &dc, char *name); | |
| 385 static DNSBLP find_dnsbl(CONFIG &dc, char *name) { | |
| 386 dnsblp_map::iterator i = dc.dnsbls.find(name); | |
| 387 if (i == dc.dnsbls.end()) return NULL; | |
| 388 return (*i).second; | |
| 389 } | |
| 390 | |
| 391 | |
| 392 //////////////////////////////////////////////// | |
| 393 // find the dnsbll with a specific name | |
| 394 // | |
| 395 static DNSBLLP find_dnsbll(CONFIG &dc, char *name); | |
| 396 static DNSBLLP find_dnsbll(CONFIG &dc, char *name) { | |
| 397 dnsbllp_map::iterator i = dc.dnsblls.find(name); | |
| 398 if (i == dc.dnsblls.end()) return NULL; | |
| 399 return (*i).second; | |
| 400 } | |
| 401 | |
| 402 | |
| 403 //////////////////////////////////////////////// | |
| 404 // find the envfrom map with a specific name | |
| 405 // | |
| 406 static string_map* find_from_map(CONFIG &dc, char *name); | |
| 407 static string_map* find_from_map(CONFIG &dc, char *name) { | |
| 408 from_map::iterator i = dc.env_from.find(name); | |
| 409 if (i == dc.env_from.end()) return NULL; | |
| 410 return (*i).second; | |
| 411 } | |
| 412 | |
| 413 | |
| 414 static string_map& really_find_from_map(CONFIG &dc, char *name); | |
| 415 static string_map& really_find_from_map(CONFIG &dc, char *name) { | |
| 416 string_map *sm = find_from_map(dc, name); | |
| 417 if (!sm) { | |
| 418 sm = new string_map; | |
| 419 dc.env_from[name] = sm; | |
| 420 } | |
| 421 return *sm; | |
| 422 } | |
| 423 | |
| 424 | |
| 425 //////////////////////////////////////////////// | |
| 8 | 426 // |
| 427 // ask a dns question and get an A record answer - we don't try | |
| 428 // very hard, just using the default resolver retry settings. | |
| 429 // If we cannot get an answer, we just accept the mail. The | |
| 430 // caller must ensure thread safety. | |
| 431 // | |
| 0 | 432 // |
| 34 | 433 static int dns_interface(char *question, bool maybe_ip, ns_map *nameservers); |
| 434 static int dns_interface(char *question, bool maybe_ip, ns_map *nameservers) { | |
| 16 | 435 #ifdef NS_PACKETSZ |
| 8 | 436 u_char answer[NS_PACKETSZ]; |
| 437 int length = res_search(question, ns_c_in, ns_t_a, answer, sizeof(answer)); | |
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438 if (length >= 0) { // no error yet |
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439 // parse the answer |
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440 ns_msg handle; |
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441 ns_rr rr; |
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442 if (ns_initparse(answer, length, &handle) == 0) { |
| 34 | 443 // look for ns names |
| 444 if (nameservers) { | |
| 445 ns_map &ns = *nameservers; | |
| 446 int rrnum = 0; | |
| 447 while (ns_parserr(&handle, ns_s_ns, rrnum++, &rr) == 0) { | |
| 448 if (ns_rr_type(rr) == ns_t_ns) { | |
| 449 char nam[NS_MAXDNAME+1]; | |
| 450 char *n = nam; | |
| 451 const u_char *p = ns_rr_rdata(rr); | |
| 452 while (((n-nam) < NS_MAXDNAME) && ((p-answer) < length) && *p) { | |
| 453 size_t s = *(p++); | |
| 454 if (s > 191) { | |
| 455 // compression pointer | |
| 456 s = (s-192)*256 + *(p++); | |
| 457 if (s >= length) break; // pointer outside bounds of answer | |
| 458 p = answer + s; | |
| 459 s = *(p++); | |
| 460 } | |
| 461 if (s > 0) { | |
| 462 if ((n-nam) >= (NS_MAXDNAME-s)) break; // destination would overflow name buffer | |
| 463 if ((p-answer) >= (length-s)) break; // source outside bounds of answer | |
| 464 memcpy(n, p, s); | |
| 465 n += s; | |
| 466 p += s; | |
| 467 *(n++) = '.'; | |
| 468 } | |
| 469 } | |
| 36 | 470 if (n-nam) n--; // remove trailing . |
| 471 *n = '\0'; // null terminate it | |
| 34 | 472 register_string(ns, nam); // ns host to lookup later |
| 473 } | |
| 474 } | |
| 475 rrnum = 0; | |
| 476 while (ns_parserr(&handle, ns_s_ar, rrnum++, &rr) == 0) { | |
| 477 if (ns_rr_type(rr) == ns_t_a) { | |
| 478 char* nam = (char*)ns_rr_name(rr); | |
| 479 ns_map::iterator i = ns.find(nam); | |
| 480 if (i != ns.end()) { | |
| 481 // we want this ip address | |
| 482 int address; | |
| 483 memcpy(&address, ns_rr_rdata(rr), sizeof(address)); | |
| 484 ns[nam] = address; | |
| 485 } | |
| 486 } | |
| 487 } | |
| 488 } | |
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489 int rrnum = 0; |
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490 while (ns_parserr(&handle, ns_s_an, rrnum++, &rr) == 0) { |
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491 if (ns_rr_type(rr) == ns_t_a) { |
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492 int address; |
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493 memcpy(&address, ns_rr_rdata(rr), sizeof(address)); |
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494 return address; |
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495 } |
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496 } |
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497 } |
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498 } |
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499 if (maybe_ip) { |
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500 // might be a bare ip address |
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501 in_addr ip; |
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502 if (inet_aton(question, &ip)) { |
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503 return ip.s_addr; |
| 8 | 504 } |
| 505 } | |
| 506 return 0; | |
| 16 | 507 #else |
| 508 struct hostent *host = gethostbyname(question); | |
| 509 if (!host) return 0; | |
| 510 if (host->h_addrtype != AF_INET) return 0; | |
| 511 int address; | |
| 512 memcpy(&address, host->h_addr, sizeof(address)); | |
| 513 return address; | |
| 514 #endif | |
| 8 | 515 } |
| 516 | |
| 34 | 517 static int protected_dns_interface(char *question, bool maybe_ip, ns_map *nameservers); |
| 518 static int protected_dns_interface(char *question, bool maybe_ip, ns_map *nameservers) { | |
| 8 | 519 int ans; |
| 520 pthread_mutex_lock(&resolve_mutex); | |
| 34 | 521 ans = dns_interface(question, maybe_ip, nameservers); |
| 8 | 522 pthread_mutex_unlock(&resolve_mutex); |
| 523 return ans; | |
| 524 | |
| 525 } | |
| 526 | |
| 527 //////////////////////////////////////////////// | |
| 528 // check a single dnsbl | |
| 529 // | |
| 530 static status check_single(int ip, char *suffix); | |
| 531 static status check_single(int ip, char *suffix) { | |
| 0 | 532 // make a dns question |
| 533 const u_char *src = (const u_char *)&ip; | |
| 534 if (src[0] == 127) return oksofar; // don't do dns lookups on localhost | |
| 16 | 535 #ifdef NS_MAXDNAME |
| 0 | 536 char question[NS_MAXDNAME]; |
| 16 | 537 #else |
| 538 char question[1000]; | |
| 539 #endif | |
| 8 | 540 snprintf(question, sizeof(question), "%u.%u.%u.%u.%s.", src[3], src[2], src[1], src[0], suffix); |
| 541 // ask the question, if we get an A record it implies a blacklisted ip address | |
| 34 | 542 return (protected_dns_interface(question, false, NULL)) ? reject : oksofar; |
| 8 | 543 } |
| 544 | |
| 545 | |
| 546 //////////////////////////////////////////////// | |
| 547 // check a single dnsbl | |
| 548 // | |
| 549 static status check_single(int ip, DNSBL &bl); | |
| 550 static status check_single(int ip, DNSBL &bl) { | |
| 551 return check_single(ip, bl.suffix); | |
| 0 | 552 } |
| 553 | |
| 554 | |
| 555 //////////////////////////////////////////////// | |
| 556 // check the dnsbls specified for this recipient | |
| 557 // | |
| 558 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist); | |
| 559 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist) { | |
| 560 if (priv.authenticated) return oksofar; | |
| 561 if (!dnsbllp) return oksofar; | |
| 562 DNSBLL &dnsbll = *dnsbllp; | |
| 563 for (DNSBLL::iterator i=dnsbll.begin(); i!=dnsbll.end(); i++) { | |
| 564 DNSBLP dp = *i; // non null by construction | |
| 565 status st; | |
| 566 map<DNSBLP, status>::iterator f = priv.checked.find(dp); | |
| 567 if (f == priv.checked.end()) { | |
| 568 // have not checked this list yet | |
| 8 | 569 st = check_single(priv.ip, *dp); |
| 0 | 570 rejectlist = dp; |
| 571 priv.checked[dp] = st; | |
| 572 } | |
| 573 else { | |
| 574 st = (*f).second; | |
| 575 rejectlist = (*f).first; | |
| 576 } | |
| 577 if (st == reject) return st; | |
| 578 } | |
| 579 return oksofar; | |
| 580 } | |
| 581 | |
| 582 | |
| 583 //////////////////////////////////////////////// | |
| 8 | 584 // check the dnsbls specified for this recipient |
| 585 // | |
| 16 | 586 static status check_hosts(mlfiPriv &priv, char *&host, int &ip); |
| 587 static status check_hosts(mlfiPriv &priv, char *&host, int &ip) { | |
| 8 | 588 CONFIG &dc = *priv.pc; |
| 589 if (!dc.content_suffix) return oksofar; | |
| 590 int count = 0; | |
| 34 | 591 ns_map nameservers; |
| 44 | 592 bool ran = priv.pc->host_random; |
| 593 int lim = priv.pc->host_limit; // we should not look at more than this many hosts | |
| 594 int cnt = priv.memory->hosts.size(); // number of hosts we could look at | |
| 595 int_set ips; // remove duplicate ip addresses | |
| 24 | 596 for (string_set::iterator i=priv.memory->hosts.begin(); i!=priv.memory->hosts.end(); i++) { |
| 44 | 597 host = *i; // a reference into priv.memory->hosts, which will live until this smtp transaction is closed |
| 598 if ((cnt > lim) && (lim > 0) && ran) { | |
| 599 // try to only look at lim/cnt fraction of the available cnt host names | |
| 600 int r = rand() % cnt; | |
| 601 if (r >= lim) { | |
| 602 char buf[1000]; | |
| 603 snprintf(buf, sizeof(buf), "host %s skipped", host); | |
| 604 my_syslog(&priv, buf); | |
| 605 continue; | |
| 606 } | |
| 607 } | |
| 8 | 608 count++; |
| 44 | 609 if ((count > lim) && (lim > 0) && (!ran)) { |
| 34 | 610 discard(nameservers); |
| 611 return reject_host; | |
| 612 } | |
| 44 | 613 ip = protected_dns_interface(host, true, &nameservers); |
| 16 | 614 if (debug_syslog) { |
| 44 | 615 char buf[1000]; |
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616 if (ip) { |
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617 char adr[sizeof "255.255.255.255"]; |
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618 adr[0] = '\0'; |
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619 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); |
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620 snprintf(buf, sizeof(buf), "host %s found at %s", host, adr); |
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621 } |
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622 else { |
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623 snprintf(buf, sizeof(buf), "host %s not found", host); |
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624 } |
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625 my_syslog(&priv, buf); |
| 16 | 626 } |
| 8 | 627 if (ip) { |
| 44 | 628 int_set::iterator i = ips.find(ip); |
| 629 if (i == ips.end()) { | |
| 630 ips.insert(ip); | |
| 631 status st = check_single(ip, dc.content_suffix); | |
| 632 if (st == reject) { | |
| 633 discard(nameservers); | |
| 634 return st; | |
| 635 } | |
| 34 | 636 } |
| 8 | 637 } |
| 638 } | |
| 34 | 639 lim *= 4; // allow average of 3 ns per host name |
| 640 for (ns_map::iterator i=nameservers.begin(); i!=nameservers.end(); i++) { | |
| 641 count++; | |
| 642 if ((count > lim) && (lim > 0)) { | |
| 44 | 643 if (ran) continue; // don't complain |
| 34 | 644 discard(nameservers); |
| 645 return reject_host; | |
| 646 } | |
| 36 | 647 host = (*i).first; // a transient reference that needs to be replaced before we return it |
| 34 | 648 ip = (*i).second; |
| 649 if (!ip) ip = protected_dns_interface(host, false, NULL); | |
| 650 if (debug_syslog) { | |
| 651 char buf[200]; | |
| 652 if (ip) { | |
| 653 char adr[sizeof "255.255.255.255"]; | |
| 654 adr[0] = '\0'; | |
| 655 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
| 656 snprintf(buf, sizeof(buf), "ns %s found at %s", host, adr); | |
| 657 } | |
| 658 else { | |
| 659 snprintf(buf, sizeof(buf), "ns %s not found", host); | |
| 660 } | |
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661 my_syslog(&priv, buf); |
| 34 | 662 } |
| 663 if (ip) { | |
| 44 | 664 int_set::iterator i = ips.find(ip); |
| 665 if (i == ips.end()) { | |
| 666 ips.insert(ip); | |
| 667 status st = check_single(ip, dc.content_suffix); | |
| 668 if (st == reject) { | |
| 669 host = register_string(priv.memory->hosts, host); // put a copy into priv.memory->hosts, and return that reference | |
| 670 discard(nameservers); | |
| 671 return st; | |
| 672 } | |
| 34 | 673 } |
| 674 } | |
| 675 } | |
| 676 discard(nameservers); | |
| 24 | 677 host = NULL; |
| 26 | 678 int bin = priv.memory->binary_tags; |
| 24 | 679 int bad = priv.memory->bad_html_tags; |
| 34 | 680 lim = priv.pc->tag_limit; |
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681 if (3*bin > bad) return oksofar; // probably .zip or .tar.gz with random content |
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682 if ((bad > lim) && (lim > 0)) return reject_tag; |
| 9 | 683 return oksofar; |
| 8 | 684 } |
| 685 | |
| 686 | |
| 687 //////////////////////////////////////////////// | |
| 0 | 688 // start of sendmail milter interfaces |
| 689 // | |
| 690 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr) | |
| 691 { | |
| 692 // allocate some private memory | |
| 693 mlfiPriv *priv = new mlfiPriv; | |
| 694 if (hostaddr->sa_family == AF_INET) { | |
| 695 priv->ip = ((struct sockaddr_in *)hostaddr)->sin_addr.s_addr; | |
| 696 } | |
| 697 | |
| 698 // save the private data | |
| 699 smfi_setpriv(ctx, (void*)priv); | |
| 700 | |
| 701 // continue processing | |
| 702 return SMFIS_CONTINUE; | |
| 703 } | |
| 704 | |
| 705 sfsistat mlfi_envfrom(SMFICTX *ctx, char **from) | |
| 706 { | |
| 707 mlfiPriv &priv = *MLFIPRIV; | |
| 708 priv.mailaddr = strdup(from[0]); | |
| 709 priv.authenticated = (smfi_getsymval(ctx, "{auth_authen}") != NULL); | |
| 710 return SMFIS_CONTINUE; | |
| 711 } | |
| 712 | |
| 713 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **rcpt) | |
| 714 { | |
| 715 DNSBLP rejectlist = NULL; // list that caused the reject | |
| 716 status st = oksofar; | |
| 717 mlfiPriv &priv = *MLFIPRIV; | |
| 718 CONFIG &dc = *priv.pc; | |
| 42 | 719 if (!priv.queueid) priv.queueid = strdup(smfi_getsymval(ctx, "i")); |
| 0 | 720 char *rcptaddr = rcpt[0]; |
| 721 char *dnsname = lookup(rcptaddr, dc.env_to_dnsbll); | |
| 722 char *fromname = lookup(rcptaddr, dc.env_to_chkfrom); | |
| 723 if ((strcmp(dnsname, BLACK) == 0) || | |
| 724 (strcmp(fromname, BLACK) == 0)) { | |
| 725 st = black; // two options to blacklist this recipient | |
| 726 } | |
| 727 else if (strcmp(fromname, WHITE) == 0) { | |
| 728 st = white; | |
| 729 } | |
| 730 else { | |
| 731 // check an env_from map | |
| 732 string_map *sm = find_from_map(dc, fromname); | |
| 733 if (sm != NULL) { | |
| 734 fromname = lookup(priv.mailaddr, *sm); // returns default if name not in map | |
| 735 if (strcmp(fromname, BLACK) == 0) { | |
| 736 st = black; // blacklist this envelope from value | |
| 737 } | |
| 738 if (strcmp(fromname, WHITE) == 0) { | |
| 739 st = white; // blacklist this envelope from value | |
| 740 } | |
| 741 } | |
| 742 } | |
| 743 if ((st == oksofar) && (strcmp(dnsname, WHITE) != 0)) { | |
| 744 // check dns lists | |
| 745 st = check_dnsbl(priv, find_dnsbll(dc, dnsname), rejectlist); | |
| 746 } | |
| 747 | |
| 748 if (st == reject) { | |
| 749 // reject the recipient based on some dnsbl | |
| 750 char adr[sizeof "255.255.255.255"]; | |
| 751 adr[0] = '\0'; | |
| 8 | 752 inet_ntop(AF_INET, (const u_char *)&priv.ip, adr, sizeof(adr)); |
| 0 | 753 char buf[2000]; |
| 754 snprintf(buf, sizeof(buf), rejectlist->message, adr, adr); | |
| 755 smfi_setreply(ctx, "550", "5.7.1", buf); | |
| 756 return SMFIS_REJECT; | |
| 757 } | |
| 758 else if (st == black) { | |
| 759 // reject the recipient based on blacklisting either from or to | |
| 760 smfi_setreply(ctx, "550", "5.7.1", "no such user"); | |
| 761 return SMFIS_REJECT; | |
| 762 } | |
| 763 else { | |
| 764 // accept the recipient | |
| 8 | 765 if (st == oksofar) { |
| 766 // but remember the non-whites | |
| 12 | 767 register_string(priv.non_whites, rcptaddr); |
| 8 | 768 priv.only_whites = false; |
| 769 } | |
| 770 if (st == white) { | |
| 771 priv.have_whites = true; | |
| 772 } | |
| 0 | 773 return SMFIS_CONTINUE; |
| 774 } | |
| 775 } | |
| 776 | |
| 8 | 777 sfsistat mlfi_body(SMFICTX *ctx, u_char *data, size_t len) |
| 0 | 778 { |
| 779 mlfiPriv &priv = *MLFIPRIV; | |
| 8 | 780 if (priv.authenticated) return SMFIS_CONTINUE; |
| 781 if (priv.only_whites) return SMFIS_CONTINUE; | |
| 782 priv.scanner->scan(data, len); | |
| 11 | 783 return SMFIS_CONTINUE; |
| 8 | 784 } |
| 785 | |
| 786 sfsistat mlfi_eom(SMFICTX *ctx) | |
| 787 { | |
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788 sfsistat rc; |
| 8 | 789 mlfiPriv &priv = *MLFIPRIV; |
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790 char *host = NULL; |
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791 int ip; |
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792 status st; |
| 8 | 793 // process end of message |
| 794 if (priv.authenticated || | |
| 795 priv.only_whites || | |
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796 ((st=check_hosts(priv, host, ip)) == oksofar)) rc = SMFIS_CONTINUE; |
| 8 | 797 else { |
| 798 if (!priv.have_whites) { | |
| 799 // can reject the entire message | |
| 800 char buf[2000]; | |
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801 if (st == reject_tag) { |
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802 // rejected due to excessive bad html tags |
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803 snprintf(buf, sizeof(buf), priv.pc->tag_limit_message); |
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804 } |
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805 else if (st == reject_host) { |
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806 // rejected due to excessive unique host/urls |
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807 snprintf(buf, sizeof(buf), priv.pc->host_limit_message); |
| 24 | 808 } |
| 809 else { | |
| 810 char adr[sizeof "255.255.255.255"]; | |
| 811 adr[0] = '\0'; | |
| 812 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
| 813 snprintf(buf, sizeof(buf), priv.pc->content_message, host, adr); | |
| 814 } | |
| 8 | 815 smfi_setreply(ctx, "550", "5.7.1", buf); |
| 816 rc = SMFIS_REJECT; | |
| 817 } | |
| 818 else { | |
| 819 // need to accept it but remove the recipients that don't want it | |
| 820 for (string_set::iterator i=priv.non_whites.begin(); i!=priv.non_whites.end(); i++) { | |
| 821 char *rcpt = *i; | |
| 822 smfi_delrcpt(ctx, rcpt); | |
| 823 } | |
| 824 rc = SMFIS_CONTINUE; | |
| 825 } | |
| 0 | 826 } |
| 8 | 827 // reset for a new message on the same connection |
| 828 mlfi_abort(ctx); | |
| 829 return rc; | |
| 830 } | |
| 831 | |
| 832 sfsistat mlfi_abort(SMFICTX *ctx) | |
| 833 { | |
| 834 mlfiPriv &priv = *MLFIPRIV; | |
| 835 priv.reset(); | |
| 0 | 836 return SMFIS_CONTINUE; |
| 837 } | |
| 838 | |
| 839 sfsistat mlfi_close(SMFICTX *ctx) | |
| 840 { | |
| 841 mlfiPriv *priv = MLFIPRIV; | |
| 842 if (!priv) return SMFIS_CONTINUE; | |
| 843 delete priv; | |
| 844 smfi_setpriv(ctx, NULL); | |
| 845 return SMFIS_CONTINUE; | |
| 846 } | |
| 847 | |
| 848 struct smfiDesc smfilter = | |
| 849 { | |
| 850 "DNSBL", // filter name | |
| 851 SMFI_VERSION, // version code -- do not change | |
| 852 SMFIF_DELRCPT, // flags | |
| 853 mlfi_connect, // connection info filter | |
| 854 NULL, // SMTP HELO command filter | |
| 855 mlfi_envfrom, // envelope sender filter | |
| 856 mlfi_envrcpt, // envelope recipient filter | |
| 857 NULL, // header filter | |
| 858 NULL, // end of header | |
| 8 | 859 mlfi_body, // body block filter |
| 860 mlfi_eom, // end of message | |
| 861 mlfi_abort, // message aborted | |
| 0 | 862 mlfi_close, // connection cleanup |
| 863 }; | |
| 864 | |
| 865 | |
| 866 static void dumpit(char *name, string_map map); | |
| 867 static void dumpit(char *name, string_map map) { | |
| 9 | 868 fprintf(stdout, "\n"); |
| 0 | 869 for (string_map::iterator i=map.begin(); i!=map.end(); i++) { |
| 9 | 870 fprintf(stdout, "%s %s->%s\n", name, (*i).first, (*i).second); |
| 0 | 871 } |
| 872 } | |
| 873 | |
| 874 | |
| 875 static void dumpit(from_map map); | |
| 876 static void dumpit(from_map map) { | |
| 877 for (from_map::iterator i=map.begin(); i!=map.end(); i++) { | |
| 3 | 878 char buf[2000]; |
| 879 snprintf(buf, sizeof(buf), "envelope from map for %s", (*i).first); | |
| 0 | 880 string_map *sm = (*i).second; |
| 3 | 881 dumpit(buf, *sm); |
| 0 | 882 } |
| 883 } | |
| 884 | |
| 885 | |
| 3 | 886 static void dumpit(CONFIG &dc); |
| 887 static void dumpit(CONFIG &dc) { | |
| 5 | 888 dumpit(dc.env_from); |
| 889 dumpit("envelope to (dnsbl list)", dc.env_to_dnsbll); | |
| 890 dumpit("envelope to (from map)", dc.env_to_chkfrom); | |
| 9 | 891 fprintf(stdout, "\ndnsbls\n"); |
| 0 | 892 for (dnsblp_map::iterator i=dc.dnsbls.begin(); i!=dc.dnsbls.end(); i++) { |
| 9 | 893 fprintf(stdout, "%s %s %s\n", (*i).first, (*i).second->suffix, (*i).second->message); |
| 0 | 894 } |
| 9 | 895 fprintf(stdout, "\ndnsbl_lists\n"); |
| 0 | 896 for (dnsbllp_map::iterator i=dc.dnsblls.begin(); i!=dc.dnsblls.end(); i++) { |
| 897 char *name = (*i).first; | |
| 898 DNSBLL &dl = *((*i).second); | |
| 9 | 899 fprintf(stdout, "%s", name); |
| 0 | 900 for (DNSBLL::iterator j=dl.begin(); j!=dl.end(); j++) { |
| 901 DNSBL &d = **j; | |
| 9 | 902 fprintf(stdout, " %s", d.suffix); |
| 0 | 903 } |
| 9 | 904 fprintf(stdout, "\n"); |
| 0 | 905 } |
| 9 | 906 if (dc.content_suffix) { |
| 907 fprintf(stdout, "\ncontent filtering enabled with %s %s\n", dc.content_suffix, dc.content_message); | |
| 908 } | |
| 46 | 909 if (dc.host_limit && !dc.host_random) { |
| 910 fprintf(stdout, "\ncontent filtering for host names hard limit %d %s\n", dc.host_limit, dc.host_limit_message); | |
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911 } |
| 46 | 912 if (dc.host_limit && dc.host_random) { |
| 913 fprintf(stdout, "\ncontent filtering for host names soft limit %d\n", dc.host_limit); | |
| 44 | 914 } |
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915 if (dc.tag_limit) { |
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916 fprintf(stdout, "\ncontent filtering for excessive html tags enabled with limit %d %s\n", dc.tag_limit, dc.tag_limit_message); |
| 24 | 917 } |
| 9 | 918 fprintf(stdout, "\nfiles\n"); |
| 3 | 919 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { |
| 920 char *f = *i; | |
| 9 | 921 fprintf(stdout, "config includes %s\n", f); |
| 3 | 922 } |
| 923 } | |
| 924 | |
| 925 | |
| 926 //////////////////////////////////////////////// | |
| 927 // check for redundant or recursive include files | |
| 928 // | |
| 929 static bool ok_to_include(CONFIG &dc, char *fn); | |
| 930 static bool ok_to_include(CONFIG &dc, char *fn) { | |
| 931 if (!fn) return false; | |
| 932 bool ok = true; | |
| 933 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 934 char *f = *i; | |
| 935 if (strcmp(f, fn) == 0) { | |
| 936 my_syslog("redundant or recursive include file detected"); | |
| 937 ok = false; | |
| 938 break; | |
| 939 } | |
| 940 } | |
| 941 return ok; | |
| 0 | 942 } |
| 943 | |
| 944 | |
| 945 //////////////////////////////////////////////// | |
| 946 // load a single config file | |
| 947 // | |
| 3 | 948 static void load_conf_dcc(CONFIG &dc, char *name, char *fn); |
| 949 static void load_conf_dcc(CONFIG &dc, char *name, char *fn) { | |
| 950 ifstream is(fn); | |
| 40 | 951 if (is.fail()) { |
| 952 char buf[1000]; | |
| 953 snprintf(buf, sizeof(buf), "include file %s not found", fn); | |
| 954 my_syslog(buf); | |
| 955 return; | |
| 956 } | |
| 39 | 957 dc.config_files.push_back(fn); |
| 958 const int LINE_SIZE = 2000; | |
| 3 | 959 char line[LINE_SIZE]; |
| 39 | 960 char *list = BLACK; |
| 3 | 961 char *delim = " \t"; |
| 962 int curline = 0; | |
| 963 while (!is.eof()) { | |
| 964 is.getline(line, LINE_SIZE); | |
| 965 curline++; | |
| 966 int n = strlen(line); | |
| 967 if (!n) continue; | |
| 968 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 969 if (line[0] == '#') continue; | |
| 970 char *head = line; | |
| 971 if (strspn(line, delim) == 0) { | |
| 972 // have a leading ok/many tag to fetch | |
| 973 char *cmd = strtok(line, delim); | |
| 974 if (strcmp(cmd, MANY) == 0) list = BLACK; | |
| 975 else if (strcmp(cmd, OK) == 0) list = WHITE; | |
| 976 head = cmd + strlen(cmd) + 1; | |
| 977 } | |
| 978 char *cmd = strtok(head, delim); | |
| 979 if (!cmd) continue; | |
| 980 if (strcmp(cmd, "env_from") == 0) { | |
| 981 char *from = next_token(delim); | |
| 982 if (from) { | |
| 983 string_map &fm = really_find_from_map(dc, name); | |
| 984 fm[from] = list; | |
| 985 } | |
| 986 } | |
| 987 else if (strcmp(cmd, "env_to") == 0) { | |
| 988 char *to = next_token(delim); | |
| 989 if (to) { | |
| 990 dc.env_to_dnsbll[to] = list; | |
| 991 dc.env_to_chkfrom[to] = list; | |
| 992 } | |
| 993 } | |
| 994 else if (strcmp(cmd, "substitute") == 0) { | |
| 995 char *tag = next_token(delim); | |
| 996 if (tag && (strcmp(tag, "mail_host") == 0)) { | |
| 997 char *from = next_token(delim); | |
| 998 if (from) { | |
| 999 string_map &fm = really_find_from_map(dc, name); | |
| 1000 fm[from] = list; | |
| 1001 } | |
| 1002 } | |
| 1003 } | |
| 1004 else if (strcmp(cmd, "include") == 0) { | |
| 1005 char *fn = next_token(delim); | |
| 1006 if (ok_to_include(dc, fn)) { | |
| 1007 load_conf_dcc(dc, name, fn); | |
| 1008 } | |
| 1009 } | |
| 1010 | |
| 1011 } | |
| 1012 is.close(); | |
| 1013 } | |
| 1014 | |
| 1015 | |
| 0 | 1016 static void load_conf(CONFIG &dc, char *fn); |
| 1017 static void load_conf(CONFIG &dc, char *fn) { | |
| 39 | 1018 ifstream is(fn); |
| 40 | 1019 if (is.fail()) { |
| 1020 char buf[1000]; | |
| 1021 snprintf(buf, sizeof(buf), "include file %s not found", fn); | |
| 1022 my_syslog(buf); | |
| 1023 return; | |
| 1024 } | |
| 0 | 1025 dc.config_files.push_back(fn); |
| 1026 map<char*, int, ltstr> commands; | |
| 46 | 1027 enum {dummy, tld, content, hostlimit, hostslimit, htmllimit, htmltag, dnsbl, dnsbll, envfrom, envto, include, includedcc}; |
| 1028 commands["tld" ] = tld; | |
| 1029 commands["content" ] = content; | |
| 1030 commands["host_limit" ] = hostlimit; | |
| 1031 commands["host_soft_limit"] = hostslimit; | |
| 1032 commands["html_limit" ] = htmllimit; | |
| 1033 commands["html_tag" ] = htmltag; | |
| 1034 commands["dnsbl" ] = dnsbl; | |
| 1035 commands["dnsbl_list" ] = dnsbll; | |
| 1036 commands["env_from" ] = envfrom; | |
| 1037 commands["env_to" ] = envto; | |
| 1038 commands["include" ] = include; | |
| 1039 commands["include_dcc" ] = includedcc; | |
| 0 | 1040 const int LINE_SIZE = 2000; |
| 1041 char line[LINE_SIZE]; | |
| 1042 char orig[LINE_SIZE]; | |
| 1043 char *delim = " \t"; | |
| 1044 int curline = 0; | |
| 1045 while (!is.eof()) { | |
| 1046 is.getline(line, LINE_SIZE); | |
| 1047 snprintf(orig, sizeof(orig), "%s", line); | |
| 1048 curline++; | |
| 1049 int n = strlen(line); | |
| 1050 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 1051 char *cmd = strtok(line, delim); | |
| 1052 if (cmd && (cmd[0] != '#') && (cmd[0] != '\0')) { | |
| 1053 // have a decent command | |
| 1054 bool processed = false; | |
| 1055 switch (commands[cmd]) { | |
| 28 | 1056 case tld: { |
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1057 char *tld = next_token(delim); |
| 28 | 1058 if (!tld) break; // no tld value |
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1059 dc.tlds.insert(tld); |
| 28 | 1060 processed = true; |
| 1061 } break; | |
| 1062 | |
| 8 | 1063 case content: { |
| 1064 char *suff = strtok(NULL, delim); | |
| 24 | 1065 if (!suff) break; // no dns suffix |
| 8 | 1066 char *msg = suff + strlen(suff); |
| 1067 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 1068 msg = strchr(msg+1, '\''); | |
| 1069 if (!msg) break; // no reply message template | |
| 1070 msg++; // move over the leading ' | |
| 1071 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 1072 char *last = strchr(msg, '\''); | |
| 1073 if (!last) break; // no trailing quote | |
| 1074 *last = '\0'; // make it a null terminator | |
| 1075 dc.content_suffix = register_string(suff); | |
| 1076 dc.content_message = register_string(msg); | |
| 1077 processed = true; | |
| 1078 } break; | |
| 1079 | |
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1080 case hostlimit: { |
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1081 char *limit = strtok(NULL, delim); |
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1082 if (!limit) break; // no integer limit |
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1083 char *msg = limit + strlen(limit); |
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1084 if ((msg - line) >= strlen(orig)) break; // line ended with the limit |
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1085 msg = strchr(msg+1, '\''); |
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1086 if (!msg) break; // no reply message template |
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1087 msg++; // move over the leading ' |
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1088 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote |
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1089 char *last = strchr(msg, '\''); |
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1090 if (!last) break; // no trailing quote |
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1091 *last = '\0'; // make it a null terminator |
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1092 dc.host_limit = atoi(limit); |
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1093 dc.host_limit_message = register_string(msg); |
| 46 | 1094 dc.host_random = false; |
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1095 processed = true; |
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1096 } break; |
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1097 |
| 46 | 1098 case hostslimit: { |
| 1099 char *limit = next_token(delim); | |
| 1100 if (!limit) break; // no integer limit | |
| 1101 dc.host_limit = atoi(limit); | |
| 44 | 1102 dc.host_random = true; |
| 1103 processed = true; | |
| 1104 } break; | |
| 1105 | |
| 24 | 1106 case htmllimit: { |
| 1107 char *limit = strtok(NULL, delim); | |
| 1108 if (!limit) break; // no integer limit | |
| 1109 char *msg = limit + strlen(limit); | |
| 1110 if ((msg - line) >= strlen(orig)) break; // line ended with the limit | |
| 1111 msg = strchr(msg+1, '\''); | |
| 1112 if (!msg) break; // no reply message template | |
| 1113 msg++; // move over the leading ' | |
| 1114 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 1115 char *last = strchr(msg, '\''); | |
| 1116 if (!last) break; // no trailing quote | |
| 1117 *last = '\0'; // make it a null terminator | |
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1118 dc.tag_limit = atoi(limit); |
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1119 dc.tag_limit_message = register_string(msg); |
| 24 | 1120 processed = true; |
| 1121 } break; | |
| 1122 | |
| 1123 case htmltag: { | |
| 1124 char *tag = next_token(delim); | |
| 1125 if (!tag) break; // no html tag value | |
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1126 dc.html_tags.insert(tag); // base version |
| 26 | 1127 char buf[200]; |
| 1128 snprintf(buf, sizeof(buf), "/%s", tag); | |
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1129 dc.html_tags.insert(register_string(buf)); // leading / |
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1130 snprintf(buf, sizeof(buf), "%s/", tag); |
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1131 dc.html_tags.insert(register_string(buf)); // trailing / |
| 24 | 1132 processed = true; |
| 1133 } break; | |
| 1134 | |
| 0 | 1135 case dnsbl: { |
| 1136 // have a new dnsbl to use | |
| 1137 char *name = next_token(delim); | |
| 1138 if (!name) break; // no name name | |
| 1139 if (find_dnsbl(dc, name)) break; // duplicate entry | |
| 1140 char *suff = strtok(NULL, delim); | |
| 1141 if (!suff) break; // no dns suffic | |
| 1142 char *msg = suff + strlen(suff); | |
| 1143 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 1144 msg = strchr(msg+1, '\''); | |
| 1145 if (!msg) break; // no reply message template | |
| 1146 msg++; // move over the leading ' | |
| 1147 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 1148 char *last = strchr(msg, '\''); | |
| 1149 if (!last) break; // no trailing quote | |
| 1150 *last = '\0'; // make it a null terminator | |
| 1151 dc.dnsbls[name] = new DNSBL(register_string(suff), register_string(msg)); | |
| 1152 processed = true; | |
| 1153 } break; | |
| 1154 | |
| 1155 case dnsbll: { | |
| 1156 // define a new combination of dnsbls | |
| 1157 char *name = next_token(delim); | |
| 1158 if (!name) break; | |
| 1159 if (find_dnsbll(dc, name)) break; // duplicate entry | |
| 1160 char *list = next_token(delim); | |
| 1161 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 1162 DNSBLLP d = new DNSBLL; | |
| 1163 DNSBLP p = find_dnsbl(dc, list); | |
| 1164 if (p) d->push_back(p); | |
| 1165 while (true) { | |
| 1166 list = next_token(delim); | |
| 1167 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 1168 DNSBLP p = find_dnsbl(dc, list); | |
| 1169 if (p) d->push_back(p); | |
| 1170 } | |
| 1171 dc.dnsblls[name] = d; | |
| 1172 processed = true; | |
| 1173 } break; | |
| 1174 | |
| 1175 case envfrom: { | |
| 1176 // add an entry into the named string_map | |
| 1177 char *name = next_token(delim); | |
| 1178 if (!name) break; | |
| 1179 char *from = next_token(delim); | |
| 1180 if (!from) break; | |
| 1181 char *list = next_token(delim); | |
| 1182 if (!list) break; | |
| 1183 if ((strcmp(list, WHITE) == 0) || | |
| 1184 (strcmp(list, BLACK) == 0)) { | |
| 1185 string_map &fm = really_find_from_map(dc, name); | |
| 1186 fm[from] = list; | |
| 1187 processed = true; | |
| 1188 } | |
| 1189 else { | |
| 1190 // list may be the name of a previously defined from_map | |
| 1191 string_map *m = find_from_map(dc, list); | |
| 1192 if (m && (strcmp(list,name) != 0)) { | |
| 1193 string_map &pm = *m; | |
| 1194 string_map &fm = really_find_from_map(dc, name); | |
| 1195 fm.insert(pm.begin(), pm.end()); | |
| 1196 processed = true; | |
| 1197 } | |
| 1198 } | |
| 1199 } break; | |
| 1200 | |
| 1201 case envto: { | |
| 1202 // define the dnsbl_list and env_from maps to use for this recipient | |
| 1203 char *to = next_token(delim); | |
| 1204 if (!to) break; | |
| 1205 char *list = next_token(delim); | |
| 1206 if (!list) break; | |
| 1207 char *from = next_token(delim); | |
| 1208 if (!from) break; | |
| 1209 dc.env_to_dnsbll[to] = list; | |
| 1210 dc.env_to_chkfrom[to] = from; | |
| 1211 processed = true; | |
| 1212 } break; | |
| 1213 | |
| 1214 case include: { | |
| 1215 char *fn = next_token(delim); | |
| 3 | 1216 if (ok_to_include(dc, fn)) { |
| 1217 load_conf(dc, fn); | |
| 1218 processed = true; | |
| 1219 } | |
| 1220 } break; | |
| 1221 | |
| 1222 case includedcc: { | |
| 1223 char *name = next_token(delim); | |
| 1224 if (!name) break; | |
| 1225 char *fn = next_token(delim); | |
| 1226 if (ok_to_include(dc, fn)) { | |
| 1227 load_conf_dcc(dc, name, fn); | |
| 1228 processed = true; | |
| 0 | 1229 } |
| 1230 } break; | |
| 1231 | |
| 1232 default: { | |
| 1233 } break; | |
| 1234 } | |
| 1235 if (!processed) { | |
| 1236 pthread_mutex_lock(&syslog_mutex); | |
| 1237 openlog("dnsbl", LOG_PID, LOG_MAIL); | |
| 1238 syslog(LOG_ERR, "ignoring file %s line %d : %s\n", fn, curline, orig); | |
| 1239 closelog(); | |
| 1240 pthread_mutex_unlock(&syslog_mutex); | |
| 1241 } | |
| 1242 } | |
| 1243 } | |
| 1244 is.close(); | |
| 1245 } | |
| 1246 | |
| 1247 | |
| 1248 //////////////////////////////////////////////// | |
| 1249 // reload the config | |
| 1250 // | |
| 1251 static CONFIG* new_conf(); | |
| 1252 static CONFIG* new_conf() { | |
| 1253 CONFIG *newc = new CONFIG; | |
|
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1254 pthread_mutex_lock(&config_mutex); |
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1255 newc->generation = generation++; |
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1256 pthread_mutex_unlock(&config_mutex); |
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1257 char buf[200]; |
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1258 snprintf(buf, sizeof(buf), "loading configuration generation %d", newc->generation); |
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1259 my_syslog(buf); |
| 0 | 1260 load_conf(*newc, "dnsbl.conf"); |
| 1261 newc->load_time = time(NULL); | |
| 1262 return newc; | |
| 1263 } | |
| 1264 | |
| 1265 | |
| 1266 //////////////////////////////////////////////// | |
| 1267 // thread to watch the old config files for changes | |
| 1268 // and reload when needed. we also cleanup old | |
| 1269 // configs whose reference count has gone to zero. | |
| 1270 // | |
| 1271 static void* config_loader(void *arg); | |
| 1272 static void* config_loader(void *arg) { | |
| 1273 typedef set<CONFIG *> configp_set; | |
| 1274 configp_set old_configs; | |
| 18 | 1275 while (loader_run) { |
| 0 | 1276 sleep(180); // look for modifications every 3 minutes |
| 18 | 1277 if (!loader_run) break; |
| 0 | 1278 CONFIG &dc = *config; |
| 1279 time_t then = dc.load_time; | |
| 1280 struct stat st; | |
| 1281 bool reload = false; | |
| 1282 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 1283 char *fn = *i; | |
| 1284 if (stat(fn, &st)) reload = true; // file disappeared | |
| 1285 else if (st.st_mtime > then) reload = true; // file modified | |
| 1286 if (reload) break; | |
| 1287 } | |
| 1288 if (reload) { | |
| 1289 CONFIG *newc = new_conf(); | |
| 1290 // replace the global config pointer | |
| 1291 pthread_mutex_lock(&config_mutex); | |
| 1292 CONFIG *old = config; | |
| 1293 config = newc; | |
| 1294 pthread_mutex_unlock(&config_mutex); | |
| 1295 if (old) old_configs.insert(old); | |
| 1296 } | |
| 1297 // now look for old configs with zero ref counts | |
| 1298 for (configp_set::iterator i=old_configs.begin(); i!=old_configs.end(); ) { | |
| 1299 CONFIG *old = *i; | |
| 1300 if (!old->reference_count) { | |
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1301 char buf[200]; |
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1302 snprintf(buf, sizeof(buf), "freeing memory for old configuration generation %d", old->generation); |
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1303 my_syslog(buf); |
| 0 | 1304 delete old; // destructor does all the work |
| 1305 old_configs.erase(i++); | |
| 1306 } | |
| 1307 else i++; | |
| 1308 } | |
| 1309 } | |
| 18 | 1310 return NULL; |
| 0 | 1311 } |
| 1312 | |
| 1313 | |
| 1314 static void usage(char *prog); | |
| 1315 static void usage(char *prog) | |
| 1316 { | |
| 16 | 1317 fprintf(stderr, "Usage: %s [-d] [-c] -p socket-addr [-t timeout]\n", prog); |
| 0 | 1318 fprintf(stderr, "where socket-addr is for the connection to sendmail and should be one of\n"); |
| 1319 fprintf(stderr, " inet:port@local-ip-address\n"); | |
| 1320 fprintf(stderr, " local:local-domain-socket-file-name\n"); | |
| 9 | 1321 fprintf(stderr, "-c will load and dump the config to stdout\n"); |
| 16 | 1322 fprintf(stderr, "-d will add some syslog debug messages\n"); |
| 0 | 1323 } |
| 1324 | |
| 1325 | |
| 42 | 1326 |
| 1327 static void setup_socket(char *sock); | |
| 1328 static void setup_socket(char *sock) { | |
| 1329 unlink(sock); | |
| 43 | 1330 // sockaddr_un addr; |
| 1331 // memset(&addr, '\0', sizeof addr); | |
| 1332 // addr.sun_family = AF_UNIX; | |
| 1333 // strncpy(addr.sun_path, sock, sizeof(addr.sun_path)-1); | |
| 1334 // int s = socket(AF_UNIX, SOCK_STREAM, 0); | |
| 1335 // bind(s, (sockaddr*)&addr, sizeof(addr)); | |
| 1336 // close(s); | |
| 42 | 1337 } |
| 1338 | |
| 1339 | |
| 0 | 1340 int main(int argc, char**argv) |
| 1341 { | |
| 3 | 1342 bool check = false; |
| 1343 bool setconn = false; | |
| 0 | 1344 int c; |
| 16 | 1345 const char *args = "p:t:hcd"; |
| 0 | 1346 extern char *optarg; |
| 1347 | |
| 1348 // Process command line options | |
| 1349 while ((c = getopt(argc, argv, args)) != -1) { | |
| 1350 switch (c) { | |
| 1351 case 'p': | |
| 1352 if (optarg == NULL || *optarg == '\0') { | |
| 1353 fprintf(stderr, "Illegal conn: %s\n", optarg); | |
| 1354 exit(EX_USAGE); | |
| 1355 } | |
| 1356 if (smfi_setconn(optarg) == MI_FAILURE) { | |
| 1357 fprintf(stderr, "smfi_setconn failed\n"); | |
| 1358 exit(EX_SOFTWARE); | |
| 1359 } | |
| 1360 | |
| 42 | 1361 if (strncasecmp(optarg, "unix:", 5) == 0) setup_socket(optarg + 5); |
| 1362 else if (strncasecmp(optarg, "local:", 6) == 0) setup_socket(optarg + 6); | |
| 3 | 1363 setconn = true; |
| 0 | 1364 break; |
| 1365 | |
| 1366 case 't': | |
| 1367 if (optarg == NULL || *optarg == '\0') { | |
| 1368 fprintf(stderr, "Illegal timeout: %s\n", optarg); | |
| 1369 exit(EX_USAGE); | |
| 1370 } | |
| 1371 if (smfi_settimeout(atoi(optarg)) == MI_FAILURE) { | |
| 1372 fprintf(stderr, "smfi_settimeout failed\n"); | |
| 1373 exit(EX_SOFTWARE); | |
| 1374 } | |
| 1375 break; | |
| 1376 | |
| 3 | 1377 case 'c': |
| 1378 check = true; | |
| 1379 break; | |
| 1380 | |
| 16 | 1381 case 'd': |
| 1382 debug_syslog = true; | |
| 1383 break; | |
| 1384 | |
| 0 | 1385 case 'h': |
| 1386 default: | |
| 1387 usage(argv[0]); | |
| 1388 exit(EX_USAGE); | |
| 1389 } | |
| 1390 } | |
| 5 | 1391 |
| 1392 if (check) { | |
| 1393 CONFIG &dc = *new_conf(); | |
| 1394 dumpit(dc); | |
| 1395 return 0; | |
| 1396 } | |
| 1397 | |
| 0 | 1398 if (!setconn) { |
| 1399 fprintf(stderr, "%s: Missing required -p argument\n", argv[0]); | |
| 1400 usage(argv[0]); | |
| 1401 exit(EX_USAGE); | |
| 1402 } | |
| 5 | 1403 |
| 0 | 1404 if (smfi_register(smfilter) == MI_FAILURE) { |
| 1405 fprintf(stderr, "smfi_register failed\n"); | |
| 1406 exit(EX_UNAVAILABLE); | |
| 1407 } | |
| 1408 | |
| 1409 // switch to background mode | |
| 1410 if (daemon(1,0) < 0) { | |
| 1411 fprintf(stderr, "daemon() call failed\n"); | |
| 1412 exit(EX_UNAVAILABLE); | |
| 1413 } | |
| 1414 | |
| 1415 // write the pid | |
| 1416 const char *pidpath = "/var/run/dnsbl.pid"; | |
| 1417 unlink(pidpath); | |
| 1418 FILE *f = fopen(pidpath, "w"); | |
| 1419 if (f) { | |
| 22 | 1420 #ifdef linux |
| 1421 // from a comment in the DCC source code: | |
| 1422 // Linux threads are broken. Signals given the | |
| 1423 // original process are delivered to only the | |
| 1424 // thread that happens to have that PID. The | |
| 1425 // sendmail libmilter thread that needs to hear | |
| 1426 // SIGINT and other signals does not, and that breaks | |
| 1427 // scripts that need to stop milters. | |
| 1428 // However, signaling the process group works. | |
| 0 | 1429 fprintf(f, "-%d\n", (u_int)getpgrp()); |
| 22 | 1430 #else |
| 1431 fprintf(f, "%d\n", (u_int)getpid()); | |
| 1432 #endif | |
| 0 | 1433 fclose(f); |
| 1434 } | |
| 1435 | |
| 42 | 1436 // drop root privs |
| 1437 struct passwd *pw = getpwnam("dnsbl"); | |
| 1438 if (pw) { | |
| 48 | 1439 if (setgid(pw->pw_gid) == -1) { |
| 1440 my_syslog("failed to switch to group dnsbl"); | |
| 1441 } | |
| 42 | 1442 if (setuid(pw->pw_uid) == -1) { |
| 1443 my_syslog("failed to switch to user dnsbl"); | |
| 1444 } | |
| 1445 } | |
| 1446 | |
| 48 | 1447 // initialize the thread sync objects |
| 1448 pthread_mutex_init(&config_mutex, 0); | |
| 1449 pthread_mutex_init(&syslog_mutex, 0); | |
| 1450 pthread_mutex_init(&resolve_mutex, 0); | |
| 1451 | |
| 1452 // load the initial config | |
| 1453 config = new_conf(); | |
| 1454 | |
| 1455 // only create threads after the fork() in daemon | |
| 1456 pthread_t tid; | |
| 1457 if (pthread_create(&tid, 0, config_loader, 0)) | |
| 1458 my_syslog("failed to create config loader thread"); | |
| 1459 if (pthread_detach(tid)) | |
| 1460 my_syslog("failed to detach config loader thread"); | |
| 1461 | |
| 18 | 1462 time_t starting = time(NULL); |
| 1463 int rc = smfi_main(); | |
| 22 | 1464 if ((rc != MI_SUCCESS) && (time(NULL) > starting+5*60)) { |
| 18 | 1465 my_syslog("trying to restart after smfi_main()"); |
| 1466 loader_run = false; // eventually the config loader thread will terminate | |
| 1467 execvp(argv[0], argv); | |
| 1468 } | |
| 1469 exit((rc == MI_SUCCESS) ? 0 : EX_UNAVAILABLE); | |
| 0 | 1470 } |
| 8 | 1471 |