Mercurial > dnsbl
annotate src/dnsbl.cpp @ 58:7bb8bbf79285
changes to handle 5iantlavalamp.com
| author | carl |
|---|---|
| date | Thu, 28 Oct 2004 22:54:34 -0700 |
| parents | 419e00901570 |
| children | 510a511ad554 |
| 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 | |
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28 4) Check if the envelope from domain name primary MX points 127.0.0.0/8 |
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29 |
| 0 | 30 */ |
| 31 | |
| 32 | |
| 33 // from sendmail sample | |
| 34 #include <sys/types.h> | |
| 35 #include <sys/stat.h> | |
| 36 #include <errno.h> | |
| 37 #include <sysexits.h> | |
| 38 #include <unistd.h> | |
| 39 | |
| 40 // needed for socket io | |
| 41 #include <sys/ioctl.h> | |
| 42 #include <net/if.h> | |
| 43 #include <arpa/inet.h> | |
| 44 #include <netinet/in.h> | |
| 45 #include <netinet/tcp.h> | |
| 46 #include <netdb.h> | |
| 47 #include <sys/socket.h> | |
| 42 | 48 #include <sys/un.h> |
| 0 | 49 |
| 50 // needed for thread | |
| 51 #include <pthread.h> | |
| 52 | |
| 53 // needed for std c++ collections | |
| 54 #include <set> | |
| 55 #include <map> | |
| 56 #include <list> | |
| 57 | |
| 58 // for the dns resolver | |
| 59 #include <netinet/in.h> | |
| 60 #include <arpa/nameser.h> | |
| 61 #include <resolv.h> | |
| 62 | |
| 63 // misc stuff needed here | |
| 64 #include <ctype.h> | |
| 65 #include <fstream> | |
| 66 #include <syslog.h> | |
| 42 | 67 #include <pwd.h> |
| 0 | 68 |
| 8 | 69 static char* dnsbl_version="$Id$"; |
| 0 | 70 |
| 8 | 71 #define DEFAULT "default" |
| 72 #define WHITE "white" | |
| 73 #define BLACK "black" | |
| 74 #define OK "ok" | |
| 75 #define MANY "many" | |
| 76 | |
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77 enum status {oksofar, // not rejected yet |
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78 white, // whitelisted by envelope from |
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79 black, // blacklisted by envelope from or to |
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80 reject, // rejected by a dns list |
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81 reject_tag, // too many bad html tags |
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82 reject_host}; // too many hosts/urls in body |
| 1 | 83 |
| 0 | 84 using namespace std; |
| 85 | |
| 86 extern "C" { | |
| 87 #include "libmilter/mfapi.h" | |
| 88 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr); | |
| 89 sfsistat mlfi_envfrom(SMFICTX *ctx, char **argv); | |
| 90 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **argv); | |
| 8 | 91 sfsistat mlfi_body(SMFICTX *ctx, u_char *data, size_t len); |
| 92 sfsistat mlfi_eom(SMFICTX *ctx); | |
| 93 sfsistat mlfi_abort(SMFICTX *ctx); | |
| 0 | 94 sfsistat mlfi_close(SMFICTX *ctx); |
| 95 } | |
| 96 | |
| 97 struct ltstr { | |
| 98 bool operator()(char* s1, char* s2) const { | |
| 99 return strcmp(s1, s2) < 0; | |
| 100 } | |
| 101 }; | |
| 102 | |
| 103 struct DNSBL { | |
| 104 char *suffix; // blacklist suffix like blackholes.five-ten-sg.com | |
| 105 char *message; // error message with one or two %s operators for the ip address replacement | |
| 106 DNSBL(char *s, char *m); | |
| 107 }; | |
| 108 DNSBL::DNSBL(char *s, char *m) { | |
| 109 suffix = s; | |
| 110 message = m; | |
| 111 } | |
| 112 | |
| 113 typedef DNSBL * DNSBLP; | |
| 114 typedef list<DNSBLP> DNSBLL; | |
| 115 typedef DNSBLL * DNSBLLP; | |
| 116 typedef map<char *, char *, ltstr> string_map; | |
| 117 typedef map<char *, string_map *, ltstr> from_map; | |
| 118 typedef map<char *, DNSBLP, ltstr> dnsblp_map; | |
| 119 typedef map<char *, DNSBLLP, ltstr> dnsbllp_map; | |
| 120 typedef set<char *, ltstr> string_set; | |
| 44 | 121 typedef set<int> int_set; |
| 0 | 122 typedef list<char *> string_list; |
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123 typedef map<char *, int, ltstr> ns_mapper; |
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124 |
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125 struct ns_map { |
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126 // all the strings are owned by the keys/values in the ns_host string map |
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127 string_map ns_host; // nameserver name -> host name that uses this name server |
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128 ns_mapper ns_ip; // nameserver name -> ip address of the name server |
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129 }; |
| 0 | 130 |
| 131 struct CONFIG { | |
| 132 // the only mutable stuff once it has been loaded from the config file | |
| 133 int reference_count; // protected by the global config_mutex | |
| 134 // all the rest is constant after loading from the config file | |
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135 int generation; |
| 0 | 136 time_t load_time; |
| 137 string_list config_files; | |
| 138 dnsblp_map dnsbls; | |
| 139 dnsbllp_map dnsblls; | |
| 140 from_map env_from; | |
| 141 string_map env_to_dnsbll; // map recipient to a named dnsbll | |
| 142 string_map env_to_chkfrom; // map recipient to a named from map | |
| 8 | 143 char * content_suffix; // for sbl url body filtering |
| 9 | 144 char * content_message; // "" |
| 57 | 145 string_set content_host_ignore;// hosts to ignore for content sbl checking |
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146 char * host_limit_message; // error message for excessive host names |
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147 int host_limit; // limit on host names |
| 44 | 148 bool host_random; // pick a random selection of host names rather than error for excessive hosts |
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149 char * tag_limit_message; // error message for excessive bad html tags |
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150 int tag_limit; // limit on bad html tags |
| 24 | 151 string_set html_tags; // set of valid html tags |
| 28 | 152 string_set tlds; // set of valid tld components |
| 0 | 153 CONFIG(); |
| 154 ~CONFIG(); | |
| 155 }; | |
| 156 CONFIG::CONFIG() { | |
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157 reference_count = 0; |
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158 generation = 0; |
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159 load_time = 0; |
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160 content_suffix = NULL; |
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161 content_message = NULL; |
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162 host_limit_message = NULL; |
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163 host_limit = 0; |
| 44 | 164 host_random = false; |
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165 tag_limit_message = NULL; |
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166 tag_limit = 0; |
| 0 | 167 } |
| 168 CONFIG::~CONFIG() { | |
| 169 for (dnsblp_map::iterator i=dnsbls.begin(); i!=dnsbls.end(); i++) { | |
| 170 DNSBLP d = (*i).second; | |
| 24 | 171 // delete the underlying DNSBL objects. |
| 0 | 172 delete d; |
| 173 } | |
| 174 for (dnsbllp_map::iterator i=dnsblls.begin(); i!=dnsblls.end(); i++) { | |
| 175 DNSBLLP d = (*i).second; | |
| 24 | 176 // *d is a list of pointers to DNSBL objects, but |
| 177 // the underlying objects have already been deleted above. | |
| 0 | 178 delete d; |
| 179 } | |
| 180 for (from_map::iterator i=env_from.begin(); i!=env_from.end(); i++) { | |
| 181 string_map *d = (*i).second; | |
| 182 delete d; | |
| 183 } | |
| 184 } | |
| 185 | |
| 16 | 186 static bool debug_syslog = false; |
| 18 | 187 static bool loader_run = true; // used to stop the config loader thread |
| 0 | 188 static string_set all_strings; // owns all the strings, only modified by the config loader thread |
| 189 static CONFIG * config = NULL; // protected by the config_mutex | |
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190 static int generation = 0; // protected by the config_mutex |
| 0 | 191 |
| 192 static pthread_mutex_t config_mutex; | |
| 193 static pthread_mutex_t syslog_mutex; | |
| 194 static pthread_mutex_t resolve_mutex; | |
| 195 | |
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196 struct mlfiPriv; |
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197 |
| 0 | 198 |
| 199 //////////////////////////////////////////////// | |
| 34 | 200 // helper to discard the strings and objects held by an ns_map |
| 201 // | |
| 202 static void discard(ns_map &s); | |
| 203 static void discard(ns_map &s) { | |
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204 for (string_map::iterator i=s.ns_host.begin(); i!=s.ns_host.end(); i++) { |
| 34 | 205 char *x = (*i).first; |
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206 char *y = (*i).second; |
| 34 | 207 free(x); |
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208 free(y); |
| 34 | 209 } |
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210 s.ns_ip.clear(); |
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211 s.ns_host.clear(); |
| 34 | 212 } |
| 213 | |
| 214 //////////////////////////////////////////////// | |
| 215 // helper to register a string in an ns_map | |
| 216 // | |
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217 static void register_string(ns_map &s, char *name, char *refer); |
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218 static void register_string(ns_map &s, char *name, char *refer) { |
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219 string_map::iterator i = s.ns_host.find(name); |
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220 if (i != s.ns_host.end()) return; |
| 34 | 221 char *x = strdup(name); |
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222 char *y = strdup(refer); |
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223 s.ns_ip[x] = 0; |
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224 s.ns_host[x] = y; |
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225 |
| 34 | 226 } |
| 227 | |
| 228 //////////////////////////////////////////////// | |
| 8 | 229 // helper to discard the strings held by a string_set |
| 0 | 230 // |
| 9 | 231 static void discard(string_set &s); |
| 232 static void discard(string_set &s) { | |
| 8 | 233 for (string_set::iterator i=s.begin(); i!=s.end(); i++) { |
| 234 free(*i); | |
| 235 } | |
| 9 | 236 s.clear(); |
| 8 | 237 } |
| 0 | 238 |
| 12 | 239 //////////////////////////////////////////////// |
| 240 // helper to register a string in a string set | |
| 241 // | |
| 242 static char* register_string(string_set &s, char *name); | |
| 243 static char* register_string(string_set &s, char *name) { | |
| 244 string_set::iterator i = s.find(name); | |
| 245 if (i != s.end()) return *i; | |
| 246 char *x = strdup(name); | |
| 247 s.insert(x); | |
| 248 return x; | |
| 249 } | |
| 250 | |
| 16 | 251 //////////////////////////////////////////////// |
| 252 // syslog a message | |
| 253 // | |
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254 static void my_syslog(mlfiPriv *priv, char *text); |
| 16 | 255 |
| 256 | |
| 12 | 257 // include the content scanner |
| 258 #include "scanner.cpp" | |
| 259 | |
| 260 | |
| 0 | 261 //////////////////////////////////////////////// |
| 262 // mail filter private data, held for us by sendmail | |
| 263 // | |
| 264 struct mlfiPriv | |
| 265 { | |
| 8 | 266 // connection specific data |
| 267 CONFIG *pc; // global context with our maps | |
| 268 int ip; // ip4 address of the smtp client | |
| 269 map<DNSBLP, status> checked; // status from those lists | |
| 270 // message specific data | |
| 0 | 271 char *mailaddr; // envelope from value |
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272 char *queueid; // sendmail queue id |
| 0 | 273 bool authenticated; // client authenticated? if so, suppress all dnsbl checks |
| 8 | 274 bool have_whites; // have at least one whitelisted recipient? need to accept content and remove all non-whitelisted recipients if it fails |
| 275 bool only_whites; // every recipient is whitelisted? | |
| 24 | 276 string_set non_whites; // remember the non-whitelisted recipients so we can remove them if need be |
| 277 recorder *memory; // memory for the content scanner | |
| 8 | 278 url_scanner *scanner; // object to handle body scanning |
| 0 | 279 mlfiPriv(); |
| 280 ~mlfiPriv(); | |
| 8 | 281 void reset(bool final = false); // for a new message |
| 0 | 282 }; |
| 283 mlfiPriv::mlfiPriv() { | |
| 284 pthread_mutex_lock(&config_mutex); | |
| 285 pc = config; | |
| 286 pc->reference_count++; | |
| 287 pthread_mutex_unlock(&config_mutex); | |
| 8 | 288 ip = 0; |
| 289 mailaddr = NULL; | |
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290 queueid = NULL; |
| 8 | 291 authenticated = false; |
| 292 have_whites = false; | |
| 293 only_whites = true; | |
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294 memory = new recorder(this, &pc->html_tags, &pc->tlds); |
| 24 | 295 scanner = new url_scanner(memory); |
| 0 | 296 } |
| 297 mlfiPriv::~mlfiPriv() { | |
| 298 pthread_mutex_lock(&config_mutex); | |
| 299 pc->reference_count--; | |
| 300 pthread_mutex_unlock(&config_mutex); | |
| 8 | 301 reset(true); |
| 302 } | |
| 303 void mlfiPriv::reset(bool final) { | |
| 0 | 304 if (mailaddr) free(mailaddr); |
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305 if (queueid) free(queueid); |
| 24 | 306 discard(non_whites); |
| 307 delete memory; | |
| 8 | 308 delete scanner; |
| 309 if (!final) { | |
| 310 mailaddr = NULL; | |
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311 queueid = NULL; |
| 8 | 312 authenticated = false; |
| 313 have_whites = false; | |
| 314 only_whites = true; | |
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315 memory = new recorder(this, &pc->html_tags, &pc->tlds); |
| 24 | 316 scanner = new url_scanner(memory); |
| 8 | 317 } |
| 0 | 318 } |
| 319 | |
| 320 #define MLFIPRIV ((struct mlfiPriv *) smfi_getpriv(ctx)) | |
| 321 | |
| 322 | |
| 323 //////////////////////////////////////////////// | |
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324 // syslog a message |
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325 // |
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326 static void my_syslog(mlfiPriv *priv, char *text) { |
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327 char buf[1000]; |
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328 if (priv) { |
| 42 | 329 snprintf(buf, sizeof(buf), "%s: %s", priv->queueid, text); |
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330 text = buf; |
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331 } |
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332 pthread_mutex_lock(&syslog_mutex); |
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333 openlog("dnsbl", LOG_PID, LOG_MAIL); |
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334 syslog(LOG_NOTICE, "%s", text); |
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335 closelog(); |
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336 pthread_mutex_unlock(&syslog_mutex); |
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337 } |
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338 |
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339 static void my_syslog(char *text); |
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340 static void my_syslog(char *text) { |
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341 my_syslog(NULL, text); |
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342 } |
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343 |
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344 //////////////////////////////////////////////// |
| 0 | 345 // register a global string |
| 346 // | |
| 347 static char* register_string(char *name); | |
| 348 static char* register_string(char *name) { | |
| 12 | 349 return register_string(all_strings, name); |
| 0 | 350 } |
| 351 | |
| 352 | |
| 353 static char* next_token(char *delim); | |
| 354 static char* next_token(char *delim) { | |
| 355 char *name = strtok(NULL, delim); | |
| 356 if (!name) return name; | |
| 357 return register_string(name); | |
| 358 } | |
| 359 | |
| 360 | |
| 361 //////////////////////////////////////////////// | |
| 362 // lookup an email address in the env_from or env_to maps | |
| 363 // | |
| 364 static char* lookup1(char *email, string_map map); | |
| 365 static char* lookup1(char *email, string_map map) { | |
| 366 string_map::iterator i = map.find(email); | |
| 367 if (i != map.end()) return (*i).second; | |
| 368 char *x = strchr(email, '@'); | |
| 369 if (!x) return DEFAULT; | |
| 370 x++; | |
| 371 i = map.find(x); | |
| 372 if (i != map.end()) return (*i).second; | |
| 373 return DEFAULT; | |
| 374 } | |
| 375 | |
| 376 | |
| 377 //////////////////////////////////////////////// | |
| 378 // lookup an email address in the env_from or env_to maps | |
| 379 // this email address is passed in from sendmail, and will | |
| 380 // always be enclosed in <>. It may have mixed case, just | |
| 381 // as the mail client sent it. | |
| 382 // | |
| 383 static char* lookup(char* email, string_map map); | |
| 384 static char* lookup(char* email, string_map map) { | |
| 385 int n = strlen(email)-2; | |
| 386 if (n < 1) return DEFAULT; // malformed | |
| 387 char *key = strdup(email+1); | |
| 388 key[n] = '\0'; | |
| 389 for (int i=0; i<n; i++) key[i] = tolower(key[i]); | |
| 390 char *rc = lookup1(key, map); | |
| 391 free(key); | |
| 392 return rc; | |
| 393 } | |
| 394 | |
| 395 | |
| 396 //////////////////////////////////////////////// | |
| 397 // find the dnsbl with a specific name | |
| 398 // | |
| 399 static DNSBLP find_dnsbl(CONFIG &dc, char *name); | |
| 400 static DNSBLP find_dnsbl(CONFIG &dc, char *name) { | |
| 401 dnsblp_map::iterator i = dc.dnsbls.find(name); | |
| 402 if (i == dc.dnsbls.end()) return NULL; | |
| 403 return (*i).second; | |
| 404 } | |
| 405 | |
| 406 | |
| 407 //////////////////////////////////////////////// | |
| 408 // find the dnsbll with a specific name | |
| 409 // | |
| 410 static DNSBLLP find_dnsbll(CONFIG &dc, char *name); | |
| 411 static DNSBLLP find_dnsbll(CONFIG &dc, char *name) { | |
| 412 dnsbllp_map::iterator i = dc.dnsblls.find(name); | |
| 413 if (i == dc.dnsblls.end()) return NULL; | |
| 414 return (*i).second; | |
| 415 } | |
| 416 | |
| 417 | |
| 418 //////////////////////////////////////////////// | |
| 419 // find the envfrom map with a specific name | |
| 420 // | |
| 421 static string_map* find_from_map(CONFIG &dc, char *name); | |
| 422 static string_map* find_from_map(CONFIG &dc, char *name) { | |
| 423 from_map::iterator i = dc.env_from.find(name); | |
| 424 if (i == dc.env_from.end()) return NULL; | |
| 425 return (*i).second; | |
| 426 } | |
| 427 | |
| 428 | |
| 429 static string_map& really_find_from_map(CONFIG &dc, char *name); | |
| 430 static string_map& really_find_from_map(CONFIG &dc, char *name) { | |
| 431 string_map *sm = find_from_map(dc, name); | |
| 432 if (!sm) { | |
| 433 sm = new string_map; | |
| 434 dc.env_from[name] = sm; | |
| 435 } | |
| 436 return *sm; | |
| 437 } | |
| 438 | |
| 439 | |
| 440 //////////////////////////////////////////////// | |
| 8 | 441 // |
| 442 // ask a dns question and get an A record answer - we don't try | |
| 443 // very hard, just using the default resolver retry settings. | |
| 444 // If we cannot get an answer, we just accept the mail. The | |
| 445 // caller must ensure thread safety. | |
| 446 // | |
| 0 | 447 // |
| 34 | 448 static int dns_interface(char *question, bool maybe_ip, ns_map *nameservers); |
| 449 static int dns_interface(char *question, bool maybe_ip, ns_map *nameservers) { | |
| 16 | 450 #ifdef NS_PACKETSZ |
| 8 | 451 u_char answer[NS_PACKETSZ]; |
| 452 int length = res_search(question, ns_c_in, ns_t_a, answer, sizeof(answer)); | |
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453 if (length >= 0) { // no error yet |
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454 // parse the answer |
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455 ns_msg handle; |
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456 ns_rr rr; |
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457 if (ns_initparse(answer, length, &handle) == 0) { |
| 34 | 458 // look for ns names |
| 459 if (nameservers) { | |
| 460 ns_map &ns = *nameservers; | |
| 461 int rrnum = 0; | |
| 462 while (ns_parserr(&handle, ns_s_ns, rrnum++, &rr) == 0) { | |
| 463 if (ns_rr_type(rr) == ns_t_ns) { | |
| 464 char nam[NS_MAXDNAME+1]; | |
| 465 char *n = nam; | |
| 466 const u_char *p = ns_rr_rdata(rr); | |
| 467 while (((n-nam) < NS_MAXDNAME) && ((p-answer) < length) && *p) { | |
| 468 size_t s = *(p++); | |
| 469 if (s > 191) { | |
| 470 // compression pointer | |
| 471 s = (s-192)*256 + *(p++); | |
| 472 if (s >= length) break; // pointer outside bounds of answer | |
| 473 p = answer + s; | |
| 474 s = *(p++); | |
| 475 } | |
| 476 if (s > 0) { | |
| 477 if ((n-nam) >= (NS_MAXDNAME-s)) break; // destination would overflow name buffer | |
| 478 if ((p-answer) >= (length-s)) break; // source outside bounds of answer | |
| 479 memcpy(n, p, s); | |
| 480 n += s; | |
| 481 p += s; | |
| 482 *(n++) = '.'; | |
| 483 } | |
| 484 } | |
| 36 | 485 if (n-nam) n--; // remove trailing . |
| 486 *n = '\0'; // null terminate it | |
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487 register_string(ns, nam, question); // ns host to lookup later |
| 34 | 488 } |
| 489 } | |
| 490 rrnum = 0; | |
| 491 while (ns_parserr(&handle, ns_s_ar, rrnum++, &rr) == 0) { | |
| 492 if (ns_rr_type(rr) == ns_t_a) { | |
| 493 char* nam = (char*)ns_rr_name(rr); | |
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494 ns_mapper::iterator i = ns.ns_ip.find(nam); |
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495 if (i != ns.ns_ip.end()) { |
| 34 | 496 // we want this ip address |
| 497 int address; | |
| 498 memcpy(&address, ns_rr_rdata(rr), sizeof(address)); | |
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499 ns.ns_ip[nam] = address; |
| 34 | 500 } |
| 501 } | |
| 502 } | |
| 503 } | |
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504 int rrnum = 0; |
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505 while (ns_parserr(&handle, ns_s_an, rrnum++, &rr) == 0) { |
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506 if (ns_rr_type(rr) == ns_t_a) { |
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507 int address; |
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508 memcpy(&address, ns_rr_rdata(rr), sizeof(address)); |
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509 return address; |
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510 } |
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511 } |
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512 } |
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513 } |
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514 if (maybe_ip) { |
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515 // might be a bare ip address |
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516 in_addr ip; |
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517 if (inet_aton(question, &ip)) { |
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518 return ip.s_addr; |
| 8 | 519 } |
| 520 } | |
| 521 return 0; | |
| 16 | 522 #else |
| 523 struct hostent *host = gethostbyname(question); | |
| 524 if (!host) return 0; | |
| 525 if (host->h_addrtype != AF_INET) return 0; | |
| 526 int address; | |
| 527 memcpy(&address, host->h_addr, sizeof(address)); | |
| 528 return address; | |
| 529 #endif | |
| 8 | 530 } |
| 531 | |
| 34 | 532 static int protected_dns_interface(char *question, bool maybe_ip, ns_map *nameservers); |
| 533 static int protected_dns_interface(char *question, bool maybe_ip, ns_map *nameservers) { | |
| 8 | 534 int ans; |
| 535 pthread_mutex_lock(&resolve_mutex); | |
| 34 | 536 ans = dns_interface(question, maybe_ip, nameservers); |
| 8 | 537 pthread_mutex_unlock(&resolve_mutex); |
| 538 return ans; | |
| 539 | |
| 540 } | |
| 541 | |
| 542 //////////////////////////////////////////////// | |
| 543 // check a single dnsbl | |
| 544 // | |
| 545 static status check_single(int ip, char *suffix); | |
| 546 static status check_single(int ip, char *suffix) { | |
| 0 | 547 // make a dns question |
| 548 const u_char *src = (const u_char *)&ip; | |
| 549 if (src[0] == 127) return oksofar; // don't do dns lookups on localhost | |
| 16 | 550 #ifdef NS_MAXDNAME |
| 0 | 551 char question[NS_MAXDNAME]; |
| 16 | 552 #else |
| 553 char question[1000]; | |
| 554 #endif | |
| 8 | 555 snprintf(question, sizeof(question), "%u.%u.%u.%u.%s.", src[3], src[2], src[1], src[0], suffix); |
| 556 // ask the question, if we get an A record it implies a blacklisted ip address | |
| 34 | 557 return (protected_dns_interface(question, false, NULL)) ? reject : oksofar; |
| 8 | 558 } |
| 559 | |
| 560 | |
| 561 //////////////////////////////////////////////// | |
| 562 // check a single dnsbl | |
| 563 // | |
| 564 static status check_single(int ip, DNSBL &bl); | |
| 565 static status check_single(int ip, DNSBL &bl) { | |
| 566 return check_single(ip, bl.suffix); | |
| 0 | 567 } |
| 568 | |
| 569 | |
| 570 //////////////////////////////////////////////// | |
| 571 // check the dnsbls specified for this recipient | |
| 572 // | |
| 573 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist); | |
| 574 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist) { | |
| 575 if (priv.authenticated) return oksofar; | |
| 576 if (!dnsbllp) return oksofar; | |
| 577 DNSBLL &dnsbll = *dnsbllp; | |
| 578 for (DNSBLL::iterator i=dnsbll.begin(); i!=dnsbll.end(); i++) { | |
| 579 DNSBLP dp = *i; // non null by construction | |
| 580 status st; | |
| 581 map<DNSBLP, status>::iterator f = priv.checked.find(dp); | |
| 582 if (f == priv.checked.end()) { | |
| 583 // have not checked this list yet | |
| 8 | 584 st = check_single(priv.ip, *dp); |
| 0 | 585 rejectlist = dp; |
| 586 priv.checked[dp] = st; | |
| 587 } | |
| 588 else { | |
| 589 st = (*f).second; | |
| 590 rejectlist = (*f).first; | |
| 591 } | |
| 592 if (st == reject) return st; | |
| 593 } | |
| 594 return oksofar; | |
| 595 } | |
| 596 | |
| 597 | |
| 598 //////////////////////////////////////////////// | |
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599 // check the hosts from the body against the content dnsbl |
| 8 | 600 // |
| 16 | 601 static status check_hosts(mlfiPriv &priv, char *&host, int &ip); |
| 602 static status check_hosts(mlfiPriv &priv, char *&host, int &ip) { | |
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603 CONFIG &dc = *priv.pc; |
| 8 | 604 int count = 0; |
| 34 | 605 ns_map nameservers; |
| 44 | 606 bool ran = priv.pc->host_random; |
| 607 int lim = priv.pc->host_limit; // we should not look at more than this many hosts | |
| 608 int cnt = priv.memory->hosts.size(); // number of hosts we could look at | |
| 609 int_set ips; // remove duplicate ip addresses | |
| 24 | 610 for (string_set::iterator i=priv.memory->hosts.begin(); i!=priv.memory->hosts.end(); i++) { |
| 44 | 611 host = *i; // a reference into priv.memory->hosts, which will live until this smtp transaction is closed |
| 58 | 612 |
| 613 // don't bother looking up hosts on the ignore list | |
| 57 | 614 string_set::iterator j = priv.pc->content_host_ignore.find(host); |
| 58 | 615 if (j != priv.pc->content_host_ignore.end()) continue; |
| 616 | |
| 617 // try to only look at lim/cnt fraction of the available cnt host names in random mode | |
| 44 | 618 if ((cnt > lim) && (lim > 0) && ran) { |
| 619 int r = rand() % cnt; | |
| 620 if (r >= lim) { | |
| 621 char buf[1000]; | |
| 622 snprintf(buf, sizeof(buf), "host %s skipped", host); | |
| 623 my_syslog(&priv, buf); | |
| 624 continue; | |
| 625 } | |
| 626 } | |
| 8 | 627 count++; |
| 44 | 628 if ((count > lim) && (lim > 0) && (!ran)) { |
| 34 | 629 discard(nameservers); |
| 630 return reject_host; | |
| 631 } | |
| 44 | 632 ip = protected_dns_interface(host, true, &nameservers); |
| 16 | 633 if (debug_syslog) { |
| 44 | 634 char buf[1000]; |
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635 if (ip) { |
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636 char adr[sizeof "255.255.255.255"]; |
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637 adr[0] = '\0'; |
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638 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); |
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639 snprintf(buf, sizeof(buf), "host %s found at %s", host, adr); |
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640 } |
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641 else { |
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642 snprintf(buf, sizeof(buf), "host %s not found", host); |
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643 } |
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644 my_syslog(&priv, buf); |
| 16 | 645 } |
| 8 | 646 if (ip) { |
| 44 | 647 int_set::iterator i = ips.find(ip); |
| 648 if (i == ips.end()) { | |
| 649 ips.insert(ip); | |
| 650 status st = check_single(ip, dc.content_suffix); | |
| 651 if (st == reject) { | |
| 652 discard(nameservers); | |
| 653 return st; | |
| 654 } | |
| 34 | 655 } |
| 8 | 656 } |
| 657 } | |
| 34 | 658 lim *= 4; // allow average of 3 ns per host name |
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659 for (ns_mapper::iterator i=nameservers.ns_ip.begin(); i!=nameservers.ns_ip.end(); i++) { |
| 34 | 660 count++; |
| 661 if ((count > lim) && (lim > 0)) { | |
| 44 | 662 if (ran) continue; // don't complain |
| 34 | 663 discard(nameservers); |
| 664 return reject_host; | |
| 665 } | |
| 36 | 666 host = (*i).first; // a transient reference that needs to be replaced before we return it |
| 34 | 667 ip = (*i).second; |
| 668 if (!ip) ip = protected_dns_interface(host, false, NULL); | |
| 669 if (debug_syslog) { | |
| 670 char buf[200]; | |
| 671 if (ip) { | |
| 672 char adr[sizeof "255.255.255.255"]; | |
| 673 adr[0] = '\0'; | |
| 674 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
| 675 snprintf(buf, sizeof(buf), "ns %s found at %s", host, adr); | |
| 676 } | |
| 677 else { | |
| 678 snprintf(buf, sizeof(buf), "ns %s not found", host); | |
| 679 } | |
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680 my_syslog(&priv, buf); |
| 34 | 681 } |
| 682 if (ip) { | |
| 44 | 683 int_set::iterator i = ips.find(ip); |
| 684 if (i == ips.end()) { | |
| 685 ips.insert(ip); | |
| 686 status st = check_single(ip, dc.content_suffix); | |
| 687 if (st == reject) { | |
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688 string_map::iterator j = nameservers.ns_host.find(host); |
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689 if (j != nameservers.ns_host.end()) { |
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690 char *refer = (*j).second; |
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691 char buf[1000]; |
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692 snprintf(buf, sizeof(buf), "%s with nameserver %s", refer, host); |
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693 host = register_string(priv.memory->hosts, buf); // put a copy into priv.memory->hosts, and return that reference |
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694 } |
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695 else { |
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696 host = register_string(priv.memory->hosts, host); // put a copy into priv.memory->hosts, and return that reference |
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697 } |
| 44 | 698 discard(nameservers); |
| 699 return st; | |
| 700 } | |
| 34 | 701 } |
| 702 } | |
| 703 } | |
| 704 discard(nameservers); | |
| 24 | 705 host = NULL; |
| 26 | 706 int bin = priv.memory->binary_tags; |
| 24 | 707 int bad = priv.memory->bad_html_tags; |
| 34 | 708 lim = priv.pc->tag_limit; |
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709 if (3*bin > bad) return oksofar; // probably .zip or .tar.gz with random content |
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710 if ((bad > lim) && (lim > 0)) return reject_tag; |
| 9 | 711 return oksofar; |
| 8 | 712 } |
| 713 | |
| 714 | |
| 715 //////////////////////////////////////////////// | |
| 0 | 716 // start of sendmail milter interfaces |
| 717 // | |
| 718 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr) | |
| 719 { | |
| 720 // allocate some private memory | |
| 721 mlfiPriv *priv = new mlfiPriv; | |
| 722 if (hostaddr->sa_family == AF_INET) { | |
| 723 priv->ip = ((struct sockaddr_in *)hostaddr)->sin_addr.s_addr; | |
| 724 } | |
| 725 | |
| 726 // save the private data | |
| 727 smfi_setpriv(ctx, (void*)priv); | |
| 728 | |
| 729 // continue processing | |
| 730 return SMFIS_CONTINUE; | |
| 731 } | |
| 732 | |
| 733 sfsistat mlfi_envfrom(SMFICTX *ctx, char **from) | |
| 734 { | |
| 735 mlfiPriv &priv = *MLFIPRIV; | |
| 736 priv.mailaddr = strdup(from[0]); | |
| 737 priv.authenticated = (smfi_getsymval(ctx, "{auth_authen}") != NULL); | |
| 738 return SMFIS_CONTINUE; | |
| 739 } | |
| 740 | |
| 741 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **rcpt) | |
| 742 { | |
| 743 DNSBLP rejectlist = NULL; // list that caused the reject | |
| 744 status st = oksofar; | |
| 745 mlfiPriv &priv = *MLFIPRIV; | |
| 746 CONFIG &dc = *priv.pc; | |
| 42 | 747 if (!priv.queueid) priv.queueid = strdup(smfi_getsymval(ctx, "i")); |
| 0 | 748 char *rcptaddr = rcpt[0]; |
| 749 char *dnsname = lookup(rcptaddr, dc.env_to_dnsbll); | |
| 750 char *fromname = lookup(rcptaddr, dc.env_to_chkfrom); | |
| 751 if ((strcmp(dnsname, BLACK) == 0) || | |
| 752 (strcmp(fromname, BLACK) == 0)) { | |
| 753 st = black; // two options to blacklist this recipient | |
| 754 } | |
| 755 else if (strcmp(fromname, WHITE) == 0) { | |
| 756 st = white; | |
| 757 } | |
| 758 else { | |
| 759 // check an env_from map | |
| 760 string_map *sm = find_from_map(dc, fromname); | |
| 761 if (sm != NULL) { | |
| 762 fromname = lookup(priv.mailaddr, *sm); // returns default if name not in map | |
| 763 if (strcmp(fromname, BLACK) == 0) { | |
| 764 st = black; // blacklist this envelope from value | |
| 765 } | |
| 766 if (strcmp(fromname, WHITE) == 0) { | |
| 767 st = white; // blacklist this envelope from value | |
| 768 } | |
| 769 } | |
| 770 } | |
| 771 if ((st == oksofar) && (strcmp(dnsname, WHITE) != 0)) { | |
| 772 // check dns lists | |
| 773 st = check_dnsbl(priv, find_dnsbll(dc, dnsname), rejectlist); | |
| 774 } | |
| 775 | |
| 776 if (st == reject) { | |
| 777 // reject the recipient based on some dnsbl | |
| 778 char adr[sizeof "255.255.255.255"]; | |
| 779 adr[0] = '\0'; | |
| 8 | 780 inet_ntop(AF_INET, (const u_char *)&priv.ip, adr, sizeof(adr)); |
| 0 | 781 char buf[2000]; |
| 782 snprintf(buf, sizeof(buf), rejectlist->message, adr, adr); | |
| 783 smfi_setreply(ctx, "550", "5.7.1", buf); | |
| 784 return SMFIS_REJECT; | |
| 785 } | |
| 786 else if (st == black) { | |
| 787 // reject the recipient based on blacklisting either from or to | |
| 788 smfi_setreply(ctx, "550", "5.7.1", "no such user"); | |
| 789 return SMFIS_REJECT; | |
| 790 } | |
| 791 else { | |
| 792 // accept the recipient | |
| 8 | 793 if (st == oksofar) { |
| 794 // but remember the non-whites | |
| 12 | 795 register_string(priv.non_whites, rcptaddr); |
| 8 | 796 priv.only_whites = false; |
| 797 } | |
| 798 if (st == white) { | |
| 799 priv.have_whites = true; | |
| 800 } | |
| 0 | 801 return SMFIS_CONTINUE; |
| 802 } | |
| 803 } | |
| 804 | |
| 8 | 805 sfsistat mlfi_body(SMFICTX *ctx, u_char *data, size_t len) |
| 0 | 806 { |
| 807 mlfiPriv &priv = *MLFIPRIV; | |
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808 if (priv.authenticated) return SMFIS_CONTINUE; |
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809 if (priv.only_whites) return SMFIS_CONTINUE; |
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810 if (!priv.pc->content_suffix) return SMFIS_CONTINUE; |
| 8 | 811 priv.scanner->scan(data, len); |
| 11 | 812 return SMFIS_CONTINUE; |
| 8 | 813 } |
| 814 | |
| 815 sfsistat mlfi_eom(SMFICTX *ctx) | |
| 816 { | |
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817 sfsistat rc; |
| 8 | 818 mlfiPriv &priv = *MLFIPRIV; |
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819 char *host = NULL; |
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820 int ip; |
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821 status st; |
| 8 | 822 // process end of message |
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823 if (priv.authenticated || |
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824 priv.only_whites || |
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825 (!priv.pc->content_suffix) || |
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826 ((st=check_hosts(priv, host, ip)) == oksofar)) rc = SMFIS_CONTINUE; |
| 8 | 827 else { |
| 828 if (!priv.have_whites) { | |
| 829 // can reject the entire message | |
| 830 char buf[2000]; | |
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831 if (st == reject_tag) { |
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832 // rejected due to excessive bad html tags |
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833 snprintf(buf, sizeof(buf), priv.pc->tag_limit_message); |
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834 } |
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835 else if (st == reject_host) { |
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836 // rejected due to excessive unique host/urls |
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837 snprintf(buf, sizeof(buf), priv.pc->host_limit_message); |
| 24 | 838 } |
| 839 else { | |
| 840 char adr[sizeof "255.255.255.255"]; | |
| 841 adr[0] = '\0'; | |
| 842 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
| 843 snprintf(buf, sizeof(buf), priv.pc->content_message, host, adr); | |
| 844 } | |
| 8 | 845 smfi_setreply(ctx, "550", "5.7.1", buf); |
| 846 rc = SMFIS_REJECT; | |
| 847 } | |
| 848 else { | |
| 849 // need to accept it but remove the recipients that don't want it | |
| 850 for (string_set::iterator i=priv.non_whites.begin(); i!=priv.non_whites.end(); i++) { | |
| 851 char *rcpt = *i; | |
| 852 smfi_delrcpt(ctx, rcpt); | |
| 853 } | |
| 854 rc = SMFIS_CONTINUE; | |
| 855 } | |
| 0 | 856 } |
| 8 | 857 // reset for a new message on the same connection |
| 858 mlfi_abort(ctx); | |
| 859 return rc; | |
| 860 } | |
| 861 | |
| 862 sfsistat mlfi_abort(SMFICTX *ctx) | |
| 863 { | |
| 864 mlfiPriv &priv = *MLFIPRIV; | |
| 865 priv.reset(); | |
| 0 | 866 return SMFIS_CONTINUE; |
| 867 } | |
| 868 | |
| 869 sfsistat mlfi_close(SMFICTX *ctx) | |
| 870 { | |
| 871 mlfiPriv *priv = MLFIPRIV; | |
| 872 if (!priv) return SMFIS_CONTINUE; | |
| 873 delete priv; | |
| 874 smfi_setpriv(ctx, NULL); | |
| 875 return SMFIS_CONTINUE; | |
| 876 } | |
| 877 | |
| 878 struct smfiDesc smfilter = | |
| 879 { | |
| 880 "DNSBL", // filter name | |
| 881 SMFI_VERSION, // version code -- do not change | |
| 882 SMFIF_DELRCPT, // flags | |
| 883 mlfi_connect, // connection info filter | |
| 884 NULL, // SMTP HELO command filter | |
| 885 mlfi_envfrom, // envelope sender filter | |
| 886 mlfi_envrcpt, // envelope recipient filter | |
| 887 NULL, // header filter | |
| 888 NULL, // end of header | |
| 8 | 889 mlfi_body, // body block filter |
| 890 mlfi_eom, // end of message | |
| 891 mlfi_abort, // message aborted | |
| 0 | 892 mlfi_close, // connection cleanup |
| 893 }; | |
| 894 | |
| 895 | |
| 896 static void dumpit(char *name, string_map map); | |
| 897 static void dumpit(char *name, string_map map) { | |
| 9 | 898 fprintf(stdout, "\n"); |
| 0 | 899 for (string_map::iterator i=map.begin(); i!=map.end(); i++) { |
| 9 | 900 fprintf(stdout, "%s %s->%s\n", name, (*i).first, (*i).second); |
| 0 | 901 } |
| 902 } | |
| 903 | |
| 904 | |
| 905 static void dumpit(from_map map); | |
| 906 static void dumpit(from_map map) { | |
| 907 for (from_map::iterator i=map.begin(); i!=map.end(); i++) { | |
| 3 | 908 char buf[2000]; |
| 909 snprintf(buf, sizeof(buf), "envelope from map for %s", (*i).first); | |
| 0 | 910 string_map *sm = (*i).second; |
| 3 | 911 dumpit(buf, *sm); |
| 0 | 912 } |
| 913 } | |
| 914 | |
| 915 | |
| 3 | 916 static void dumpit(CONFIG &dc); |
| 917 static void dumpit(CONFIG &dc) { | |
| 5 | 918 dumpit(dc.env_from); |
| 919 dumpit("envelope to (dnsbl list)", dc.env_to_dnsbll); | |
| 920 dumpit("envelope to (from map)", dc.env_to_chkfrom); | |
| 9 | 921 fprintf(stdout, "\ndnsbls\n"); |
| 0 | 922 for (dnsblp_map::iterator i=dc.dnsbls.begin(); i!=dc.dnsbls.end(); i++) { |
| 9 | 923 fprintf(stdout, "%s %s %s\n", (*i).first, (*i).second->suffix, (*i).second->message); |
| 0 | 924 } |
| 9 | 925 fprintf(stdout, "\ndnsbl_lists\n"); |
| 0 | 926 for (dnsbllp_map::iterator i=dc.dnsblls.begin(); i!=dc.dnsblls.end(); i++) { |
| 927 char *name = (*i).first; | |
| 928 DNSBLL &dl = *((*i).second); | |
| 9 | 929 fprintf(stdout, "%s", name); |
| 0 | 930 for (DNSBLL::iterator j=dl.begin(); j!=dl.end(); j++) { |
| 931 DNSBL &d = **j; | |
| 9 | 932 fprintf(stdout, " %s", d.suffix); |
| 0 | 933 } |
| 9 | 934 fprintf(stdout, "\n"); |
| 0 | 935 } |
| 9 | 936 if (dc.content_suffix) { |
| 937 fprintf(stdout, "\ncontent filtering enabled with %s %s\n", dc.content_suffix, dc.content_message); | |
| 938 } | |
| 57 | 939 for (string_set::iterator i=dc.content_host_ignore.begin(); i!=dc.content_host_ignore.end(); i++) { |
| 940 fprintf(stdout, "ignore %s\n", (*i)); | |
| 941 } | |
| 46 | 942 if (dc.host_limit && !dc.host_random) { |
| 943 fprintf(stdout, "\ncontent filtering for host names hard limit %d %s\n", dc.host_limit, dc.host_limit_message); | |
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944 } |
| 46 | 945 if (dc.host_limit && dc.host_random) { |
| 946 fprintf(stdout, "\ncontent filtering for host names soft limit %d\n", dc.host_limit); | |
| 44 | 947 } |
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948 if (dc.tag_limit) { |
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949 fprintf(stdout, "\ncontent filtering for excessive html tags enabled with limit %d %s\n", dc.tag_limit, dc.tag_limit_message); |
| 24 | 950 } |
| 9 | 951 fprintf(stdout, "\nfiles\n"); |
| 3 | 952 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { |
| 953 char *f = *i; | |
| 9 | 954 fprintf(stdout, "config includes %s\n", f); |
| 3 | 955 } |
| 956 } | |
| 957 | |
| 958 | |
| 959 //////////////////////////////////////////////// | |
| 960 // check for redundant or recursive include files | |
| 961 // | |
| 962 static bool ok_to_include(CONFIG &dc, char *fn); | |
| 963 static bool ok_to_include(CONFIG &dc, char *fn) { | |
| 964 if (!fn) return false; | |
| 965 bool ok = true; | |
| 966 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 967 char *f = *i; | |
| 968 if (strcmp(f, fn) == 0) { | |
| 969 my_syslog("redundant or recursive include file detected"); | |
| 970 ok = false; | |
| 971 break; | |
| 972 } | |
| 973 } | |
| 974 return ok; | |
| 0 | 975 } |
| 976 | |
| 977 | |
| 978 //////////////////////////////////////////////// | |
| 979 // load a single config file | |
| 980 // | |
| 3 | 981 static void load_conf_dcc(CONFIG &dc, char *name, char *fn); |
| 982 static void load_conf_dcc(CONFIG &dc, char *name, char *fn) { | |
| 983 ifstream is(fn); | |
| 40 | 984 if (is.fail()) { |
| 985 char buf[1000]; | |
| 986 snprintf(buf, sizeof(buf), "include file %s not found", fn); | |
| 987 my_syslog(buf); | |
| 988 return; | |
| 989 } | |
| 39 | 990 dc.config_files.push_back(fn); |
| 991 const int LINE_SIZE = 2000; | |
| 3 | 992 char line[LINE_SIZE]; |
| 39 | 993 char *list = BLACK; |
| 3 | 994 char *delim = " \t"; |
| 995 int curline = 0; | |
| 996 while (!is.eof()) { | |
| 997 is.getline(line, LINE_SIZE); | |
| 998 curline++; | |
| 999 int n = strlen(line); | |
| 1000 if (!n) continue; | |
| 1001 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 1002 if (line[0] == '#') continue; | |
| 1003 char *head = line; | |
| 1004 if (strspn(line, delim) == 0) { | |
| 1005 // have a leading ok/many tag to fetch | |
| 1006 char *cmd = strtok(line, delim); | |
| 1007 if (strcmp(cmd, MANY) == 0) list = BLACK; | |
| 1008 else if (strcmp(cmd, OK) == 0) list = WHITE; | |
| 1009 head = cmd + strlen(cmd) + 1; | |
| 1010 } | |
| 1011 char *cmd = strtok(head, delim); | |
| 1012 if (!cmd) continue; | |
| 1013 if (strcmp(cmd, "env_from") == 0) { | |
| 1014 char *from = next_token(delim); | |
| 1015 if (from) { | |
| 1016 string_map &fm = really_find_from_map(dc, name); | |
| 1017 fm[from] = list; | |
| 1018 } | |
| 1019 } | |
| 1020 else if (strcmp(cmd, "env_to") == 0) { | |
| 1021 char *to = next_token(delim); | |
| 1022 if (to) { | |
| 1023 dc.env_to_dnsbll[to] = list; | |
| 1024 dc.env_to_chkfrom[to] = list; | |
| 1025 } | |
| 1026 } | |
| 1027 else if (strcmp(cmd, "substitute") == 0) { | |
| 1028 char *tag = next_token(delim); | |
| 1029 if (tag && (strcmp(tag, "mail_host") == 0)) { | |
| 1030 char *from = next_token(delim); | |
| 1031 if (from) { | |
| 1032 string_map &fm = really_find_from_map(dc, name); | |
| 1033 fm[from] = list; | |
| 1034 } | |
| 1035 } | |
| 1036 } | |
| 1037 else if (strcmp(cmd, "include") == 0) { | |
| 1038 char *fn = next_token(delim); | |
| 1039 if (ok_to_include(dc, fn)) { | |
| 1040 load_conf_dcc(dc, name, fn); | |
| 1041 } | |
| 1042 } | |
| 1043 | |
| 1044 } | |
| 1045 is.close(); | |
| 1046 } | |
| 1047 | |
| 1048 | |
| 0 | 1049 static void load_conf(CONFIG &dc, char *fn); |
| 1050 static void load_conf(CONFIG &dc, char *fn) { | |
| 39 | 1051 ifstream is(fn); |
| 40 | 1052 if (is.fail()) { |
| 1053 char buf[1000]; | |
| 1054 snprintf(buf, sizeof(buf), "include file %s not found", fn); | |
| 1055 my_syslog(buf); | |
| 1056 return; | |
| 1057 } | |
| 0 | 1058 dc.config_files.push_back(fn); |
| 1059 map<char*, int, ltstr> commands; | |
| 57 | 1060 enum {dummy, tld, content, ignore, hostlimit, hostslimit, htmllimit, htmltag, dnsbl, dnsbll, envfrom, envto, include, includedcc}; |
| 46 | 1061 commands["tld" ] = tld; |
| 1062 commands["content" ] = content; | |
| 57 | 1063 commands["ignore" ] = ignore; |
| 46 | 1064 commands["host_limit" ] = hostlimit; |
| 1065 commands["host_soft_limit"] = hostslimit; | |
| 1066 commands["html_limit" ] = htmllimit; | |
| 1067 commands["html_tag" ] = htmltag; | |
| 1068 commands["dnsbl" ] = dnsbl; | |
| 1069 commands["dnsbl_list" ] = dnsbll; | |
| 1070 commands["env_from" ] = envfrom; | |
| 1071 commands["env_to" ] = envto; | |
| 1072 commands["include" ] = include; | |
| 1073 commands["include_dcc" ] = includedcc; | |
| 0 | 1074 const int LINE_SIZE = 2000; |
| 1075 char line[LINE_SIZE]; | |
| 1076 char orig[LINE_SIZE]; | |
| 1077 char *delim = " \t"; | |
| 1078 int curline = 0; | |
| 1079 while (!is.eof()) { | |
| 1080 is.getline(line, LINE_SIZE); | |
| 1081 snprintf(orig, sizeof(orig), "%s", line); | |
| 1082 curline++; | |
| 1083 int n = strlen(line); | |
| 1084 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 1085 char *cmd = strtok(line, delim); | |
| 1086 if (cmd && (cmd[0] != '#') && (cmd[0] != '\0')) { | |
| 1087 // have a decent command | |
| 1088 bool processed = false; | |
| 1089 switch (commands[cmd]) { | |
| 28 | 1090 case tld: { |
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1091 char *tld = next_token(delim); |
| 28 | 1092 if (!tld) break; // no tld value |
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1093 dc.tlds.insert(tld); |
| 28 | 1094 processed = true; |
| 1095 } break; | |
| 1096 | |
| 8 | 1097 case content: { |
| 1098 char *suff = strtok(NULL, delim); | |
| 24 | 1099 if (!suff) break; // no dns suffix |
| 8 | 1100 char *msg = suff + strlen(suff); |
| 1101 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 1102 msg = strchr(msg+1, '\''); | |
| 1103 if (!msg) break; // no reply message template | |
| 1104 msg++; // move over the leading ' | |
| 1105 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 1106 char *last = strchr(msg, '\''); | |
| 1107 if (!last) break; // no trailing quote | |
| 1108 *last = '\0'; // make it a null terminator | |
| 1109 dc.content_suffix = register_string(suff); | |
| 1110 dc.content_message = register_string(msg); | |
| 1111 processed = true; | |
| 1112 } break; | |
| 1113 | |
| 57 | 1114 case ignore: { |
| 1115 char *host = next_token(delim); | |
| 1116 if (!host) break; | |
| 1117 dc.content_host_ignore.insert(host); | |
| 1118 processed = true; | |
| 1119 } break; | |
| 1120 | |
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1121 case hostlimit: { |
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1122 char *limit = strtok(NULL, delim); |
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1123 if (!limit) break; // no integer limit |
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1124 char *msg = limit + strlen(limit); |
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1125 if ((msg - line) >= strlen(orig)) break; // line ended with the limit |
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1126 msg = strchr(msg+1, '\''); |
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1127 if (!msg) break; // no reply message template |
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1128 msg++; // move over the leading ' |
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1129 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote |
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1130 char *last = strchr(msg, '\''); |
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1131 if (!last) break; // no trailing quote |
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1132 *last = '\0'; // make it a null terminator |
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1133 dc.host_limit = atoi(limit); |
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1134 dc.host_limit_message = register_string(msg); |
| 46 | 1135 dc.host_random = false; |
|
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1136 processed = true; |
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1137 } break; |
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1138 |
| 46 | 1139 case hostslimit: { |
| 1140 char *limit = next_token(delim); | |
| 1141 if (!limit) break; // no integer limit | |
| 1142 dc.host_limit = atoi(limit); | |
| 44 | 1143 dc.host_random = true; |
| 1144 processed = true; | |
| 1145 } break; | |
| 1146 | |
| 24 | 1147 case htmllimit: { |
| 1148 char *limit = strtok(NULL, delim); | |
| 1149 if (!limit) break; // no integer limit | |
| 1150 char *msg = limit + strlen(limit); | |
| 1151 if ((msg - line) >= strlen(orig)) break; // line ended with the limit | |
| 1152 msg = strchr(msg+1, '\''); | |
| 1153 if (!msg) break; // no reply message template | |
| 1154 msg++; // move over the leading ' | |
| 1155 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 1156 char *last = strchr(msg, '\''); | |
| 1157 if (!last) break; // no trailing quote | |
| 1158 *last = '\0'; // make it a null terminator | |
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1159 dc.tag_limit = atoi(limit); |
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1160 dc.tag_limit_message = register_string(msg); |
| 24 | 1161 processed = true; |
| 1162 } break; | |
| 1163 | |
| 1164 case htmltag: { | |
| 1165 char *tag = next_token(delim); | |
| 1166 if (!tag) break; // no html tag value | |
|
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1167 dc.html_tags.insert(tag); // base version |
| 26 | 1168 char buf[200]; |
| 1169 snprintf(buf, sizeof(buf), "/%s", tag); | |
|
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1170 dc.html_tags.insert(register_string(buf)); // leading / |
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1171 snprintf(buf, sizeof(buf), "%s/", tag); |
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1172 dc.html_tags.insert(register_string(buf)); // trailing / |
| 24 | 1173 processed = true; |
| 1174 } break; | |
| 1175 | |
| 0 | 1176 case dnsbl: { |
| 1177 // have a new dnsbl to use | |
| 1178 char *name = next_token(delim); | |
| 1179 if (!name) break; // no name name | |
| 1180 if (find_dnsbl(dc, name)) break; // duplicate entry | |
| 1181 char *suff = strtok(NULL, delim); | |
| 1182 if (!suff) break; // no dns suffic | |
| 1183 char *msg = suff + strlen(suff); | |
| 1184 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 1185 msg = strchr(msg+1, '\''); | |
| 1186 if (!msg) break; // no reply message template | |
| 1187 msg++; // move over the leading ' | |
| 1188 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 1189 char *last = strchr(msg, '\''); | |
| 1190 if (!last) break; // no trailing quote | |
| 1191 *last = '\0'; // make it a null terminator | |
| 1192 dc.dnsbls[name] = new DNSBL(register_string(suff), register_string(msg)); | |
| 1193 processed = true; | |
| 1194 } break; | |
| 1195 | |
| 1196 case dnsbll: { | |
| 1197 // define a new combination of dnsbls | |
| 1198 char *name = next_token(delim); | |
| 1199 if (!name) break; | |
| 1200 if (find_dnsbll(dc, name)) break; // duplicate entry | |
| 1201 char *list = next_token(delim); | |
| 1202 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 1203 DNSBLLP d = new DNSBLL; | |
| 1204 DNSBLP p = find_dnsbl(dc, list); | |
| 1205 if (p) d->push_back(p); | |
| 1206 while (true) { | |
| 1207 list = next_token(delim); | |
| 1208 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 1209 DNSBLP p = find_dnsbl(dc, list); | |
| 1210 if (p) d->push_back(p); | |
| 1211 } | |
| 1212 dc.dnsblls[name] = d; | |
| 1213 processed = true; | |
| 1214 } break; | |
| 1215 | |
| 1216 case envfrom: { | |
| 1217 // add an entry into the named string_map | |
| 1218 char *name = next_token(delim); | |
| 1219 if (!name) break; | |
| 1220 char *from = next_token(delim); | |
| 1221 if (!from) break; | |
| 1222 char *list = next_token(delim); | |
| 1223 if (!list) break; | |
| 1224 if ((strcmp(list, WHITE) == 0) || | |
| 1225 (strcmp(list, BLACK) == 0)) { | |
| 1226 string_map &fm = really_find_from_map(dc, name); | |
| 1227 fm[from] = list; | |
| 1228 processed = true; | |
| 1229 } | |
| 1230 else { | |
| 1231 // list may be the name of a previously defined from_map | |
| 1232 string_map *m = find_from_map(dc, list); | |
| 1233 if (m && (strcmp(list,name) != 0)) { | |
| 1234 string_map &pm = *m; | |
| 1235 string_map &fm = really_find_from_map(dc, name); | |
| 1236 fm.insert(pm.begin(), pm.end()); | |
| 1237 processed = true; | |
| 1238 } | |
| 1239 } | |
| 1240 } break; | |
| 1241 | |
| 1242 case envto: { | |
| 1243 // define the dnsbl_list and env_from maps to use for this recipient | |
| 1244 char *to = next_token(delim); | |
| 1245 if (!to) break; | |
| 1246 char *list = next_token(delim); | |
| 1247 if (!list) break; | |
| 1248 char *from = next_token(delim); | |
| 1249 if (!from) break; | |
| 1250 dc.env_to_dnsbll[to] = list; | |
| 1251 dc.env_to_chkfrom[to] = from; | |
| 1252 processed = true; | |
| 1253 } break; | |
| 1254 | |
| 1255 case include: { | |
| 1256 char *fn = next_token(delim); | |
| 3 | 1257 if (ok_to_include(dc, fn)) { |
| 1258 load_conf(dc, fn); | |
| 1259 processed = true; | |
| 1260 } | |
| 1261 } break; | |
| 1262 | |
| 1263 case includedcc: { | |
| 1264 char *name = next_token(delim); | |
| 1265 if (!name) break; | |
| 1266 char *fn = next_token(delim); | |
| 1267 if (ok_to_include(dc, fn)) { | |
| 1268 load_conf_dcc(dc, name, fn); | |
| 1269 processed = true; | |
| 0 | 1270 } |
| 1271 } break; | |
| 1272 | |
| 1273 default: { | |
| 1274 } break; | |
| 1275 } | |
| 1276 if (!processed) { | |
| 1277 pthread_mutex_lock(&syslog_mutex); | |
| 1278 openlog("dnsbl", LOG_PID, LOG_MAIL); | |
| 1279 syslog(LOG_ERR, "ignoring file %s line %d : %s\n", fn, curline, orig); | |
| 1280 closelog(); | |
| 1281 pthread_mutex_unlock(&syslog_mutex); | |
| 1282 } | |
| 1283 } | |
| 1284 } | |
| 1285 is.close(); | |
| 1286 } | |
| 1287 | |
| 1288 | |
| 1289 //////////////////////////////////////////////// | |
| 1290 // reload the config | |
| 1291 // | |
| 1292 static CONFIG* new_conf(); | |
| 1293 static CONFIG* new_conf() { | |
| 1294 CONFIG *newc = new CONFIG; | |
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1295 pthread_mutex_lock(&config_mutex); |
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1296 newc->generation = generation++; |
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1297 pthread_mutex_unlock(&config_mutex); |
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1298 char buf[200]; |
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1299 snprintf(buf, sizeof(buf), "loading configuration generation %d", newc->generation); |
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1300 my_syslog(buf); |
| 0 | 1301 load_conf(*newc, "dnsbl.conf"); |
| 1302 newc->load_time = time(NULL); | |
| 1303 return newc; | |
| 1304 } | |
| 1305 | |
| 1306 | |
| 1307 //////////////////////////////////////////////// | |
| 1308 // thread to watch the old config files for changes | |
| 1309 // and reload when needed. we also cleanup old | |
| 1310 // configs whose reference count has gone to zero. | |
| 1311 // | |
| 1312 static void* config_loader(void *arg); | |
| 1313 static void* config_loader(void *arg) { | |
| 1314 typedef set<CONFIG *> configp_set; | |
| 1315 configp_set old_configs; | |
| 18 | 1316 while (loader_run) { |
| 0 | 1317 sleep(180); // look for modifications every 3 minutes |
| 18 | 1318 if (!loader_run) break; |
| 0 | 1319 CONFIG &dc = *config; |
| 1320 time_t then = dc.load_time; | |
| 1321 struct stat st; | |
| 1322 bool reload = false; | |
| 1323 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 1324 char *fn = *i; | |
| 1325 if (stat(fn, &st)) reload = true; // file disappeared | |
| 1326 else if (st.st_mtime > then) reload = true; // file modified | |
| 1327 if (reload) break; | |
| 1328 } | |
| 1329 if (reload) { | |
| 1330 CONFIG *newc = new_conf(); | |
| 1331 // replace the global config pointer | |
| 1332 pthread_mutex_lock(&config_mutex); | |
| 1333 CONFIG *old = config; | |
| 1334 config = newc; | |
| 1335 pthread_mutex_unlock(&config_mutex); | |
| 1336 if (old) old_configs.insert(old); | |
| 1337 } | |
| 1338 // now look for old configs with zero ref counts | |
| 1339 for (configp_set::iterator i=old_configs.begin(); i!=old_configs.end(); ) { | |
| 1340 CONFIG *old = *i; | |
| 1341 if (!old->reference_count) { | |
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1342 char buf[200]; |
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1343 snprintf(buf, sizeof(buf), "freeing memory for old configuration generation %d", old->generation); |
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1344 my_syslog(buf); |
| 0 | 1345 delete old; // destructor does all the work |
| 1346 old_configs.erase(i++); | |
| 1347 } | |
| 1348 else i++; | |
| 1349 } | |
| 1350 } | |
| 18 | 1351 return NULL; |
| 0 | 1352 } |
| 1353 | |
| 1354 | |
| 1355 static void usage(char *prog); | |
| 1356 static void usage(char *prog) | |
| 1357 { | |
| 16 | 1358 fprintf(stderr, "Usage: %s [-d] [-c] -p socket-addr [-t timeout]\n", prog); |
| 0 | 1359 fprintf(stderr, "where socket-addr is for the connection to sendmail and should be one of\n"); |
| 1360 fprintf(stderr, " inet:port@local-ip-address\n"); | |
| 1361 fprintf(stderr, " local:local-domain-socket-file-name\n"); | |
| 9 | 1362 fprintf(stderr, "-c will load and dump the config to stdout\n"); |
| 16 | 1363 fprintf(stderr, "-d will add some syslog debug messages\n"); |
| 0 | 1364 } |
| 1365 | |
| 1366 | |
| 42 | 1367 |
| 1368 static void setup_socket(char *sock); | |
| 1369 static void setup_socket(char *sock) { | |
| 1370 unlink(sock); | |
| 43 | 1371 // sockaddr_un addr; |
| 1372 // memset(&addr, '\0', sizeof addr); | |
| 1373 // addr.sun_family = AF_UNIX; | |
| 1374 // strncpy(addr.sun_path, sock, sizeof(addr.sun_path)-1); | |
| 1375 // int s = socket(AF_UNIX, SOCK_STREAM, 0); | |
| 1376 // bind(s, (sockaddr*)&addr, sizeof(addr)); | |
| 1377 // close(s); | |
| 42 | 1378 } |
| 1379 | |
| 1380 | |
| 0 | 1381 int main(int argc, char**argv) |
| 1382 { | |
| 3 | 1383 bool check = false; |
| 1384 bool setconn = false; | |
| 0 | 1385 int c; |
| 16 | 1386 const char *args = "p:t:hcd"; |
| 0 | 1387 extern char *optarg; |
| 1388 | |
| 1389 // Process command line options | |
| 1390 while ((c = getopt(argc, argv, args)) != -1) { | |
| 1391 switch (c) { | |
| 1392 case 'p': | |
| 1393 if (optarg == NULL || *optarg == '\0') { | |
| 1394 fprintf(stderr, "Illegal conn: %s\n", optarg); | |
| 1395 exit(EX_USAGE); | |
| 1396 } | |
| 1397 if (smfi_setconn(optarg) == MI_FAILURE) { | |
| 1398 fprintf(stderr, "smfi_setconn failed\n"); | |
| 1399 exit(EX_SOFTWARE); | |
| 1400 } | |
| 1401 | |
| 42 | 1402 if (strncasecmp(optarg, "unix:", 5) == 0) setup_socket(optarg + 5); |
| 1403 else if (strncasecmp(optarg, "local:", 6) == 0) setup_socket(optarg + 6); | |
| 3 | 1404 setconn = true; |
| 0 | 1405 break; |
| 1406 | |
| 1407 case 't': | |
| 1408 if (optarg == NULL || *optarg == '\0') { | |
| 1409 fprintf(stderr, "Illegal timeout: %s\n", optarg); | |
| 1410 exit(EX_USAGE); | |
| 1411 } | |
| 1412 if (smfi_settimeout(atoi(optarg)) == MI_FAILURE) { | |
| 1413 fprintf(stderr, "smfi_settimeout failed\n"); | |
| 1414 exit(EX_SOFTWARE); | |
| 1415 } | |
| 1416 break; | |
| 1417 | |
| 3 | 1418 case 'c': |
| 1419 check = true; | |
| 1420 break; | |
| 1421 | |
| 16 | 1422 case 'd': |
| 1423 debug_syslog = true; | |
| 1424 break; | |
| 1425 | |
| 0 | 1426 case 'h': |
| 1427 default: | |
| 1428 usage(argv[0]); | |
| 1429 exit(EX_USAGE); | |
| 1430 } | |
| 1431 } | |
| 5 | 1432 |
| 1433 if (check) { | |
| 1434 CONFIG &dc = *new_conf(); | |
| 1435 dumpit(dc); | |
| 1436 return 0; | |
| 1437 } | |
| 1438 | |
| 0 | 1439 if (!setconn) { |
| 1440 fprintf(stderr, "%s: Missing required -p argument\n", argv[0]); | |
| 1441 usage(argv[0]); | |
| 1442 exit(EX_USAGE); | |
| 1443 } | |
| 5 | 1444 |
| 0 | 1445 if (smfi_register(smfilter) == MI_FAILURE) { |
| 1446 fprintf(stderr, "smfi_register failed\n"); | |
| 1447 exit(EX_UNAVAILABLE); | |
| 1448 } | |
| 1449 | |
| 1450 // switch to background mode | |
| 1451 if (daemon(1,0) < 0) { | |
| 1452 fprintf(stderr, "daemon() call failed\n"); | |
| 1453 exit(EX_UNAVAILABLE); | |
| 1454 } | |
| 1455 | |
| 1456 // write the pid | |
| 1457 const char *pidpath = "/var/run/dnsbl.pid"; | |
| 1458 unlink(pidpath); | |
| 1459 FILE *f = fopen(pidpath, "w"); | |
| 1460 if (f) { | |
| 22 | 1461 #ifdef linux |
| 1462 // from a comment in the DCC source code: | |
| 1463 // Linux threads are broken. Signals given the | |
| 1464 // original process are delivered to only the | |
| 1465 // thread that happens to have that PID. The | |
| 1466 // sendmail libmilter thread that needs to hear | |
| 1467 // SIGINT and other signals does not, and that breaks | |
| 1468 // scripts that need to stop milters. | |
| 1469 // However, signaling the process group works. | |
| 0 | 1470 fprintf(f, "-%d\n", (u_int)getpgrp()); |
| 22 | 1471 #else |
| 1472 fprintf(f, "%d\n", (u_int)getpid()); | |
| 1473 #endif | |
| 0 | 1474 fclose(f); |
| 1475 } | |
| 1476 | |
| 42 | 1477 // drop root privs |
| 1478 struct passwd *pw = getpwnam("dnsbl"); | |
| 1479 if (pw) { | |
| 48 | 1480 if (setgid(pw->pw_gid) == -1) { |
| 1481 my_syslog("failed to switch to group dnsbl"); | |
| 1482 } | |
| 42 | 1483 if (setuid(pw->pw_uid) == -1) { |
| 1484 my_syslog("failed to switch to user dnsbl"); | |
| 1485 } | |
| 1486 } | |
| 1487 | |
| 48 | 1488 // initialize the thread sync objects |
| 1489 pthread_mutex_init(&config_mutex, 0); | |
| 1490 pthread_mutex_init(&syslog_mutex, 0); | |
| 1491 pthread_mutex_init(&resolve_mutex, 0); | |
| 1492 | |
| 1493 // load the initial config | |
| 1494 config = new_conf(); | |
| 1495 | |
| 1496 // only create threads after the fork() in daemon | |
| 1497 pthread_t tid; | |
| 1498 if (pthread_create(&tid, 0, config_loader, 0)) | |
| 1499 my_syslog("failed to create config loader thread"); | |
| 1500 if (pthread_detach(tid)) | |
| 1501 my_syslog("failed to detach config loader thread"); | |
| 1502 | |
| 18 | 1503 time_t starting = time(NULL); |
| 1504 int rc = smfi_main(); | |
| 22 | 1505 if ((rc != MI_SUCCESS) && (time(NULL) > starting+5*60)) { |
| 18 | 1506 my_syslog("trying to restart after smfi_main()"); |
| 1507 loader_run = false; // eventually the config loader thread will terminate | |
| 1508 execvp(argv[0], argv); | |
| 1509 } | |
| 1510 exit((rc == MI_SUCCESS) ? 0 : EX_UNAVAILABLE); | |
| 0 | 1511 } |
| 8 | 1512 |