Mercurial > dnsbl
annotate src/dnsbl.cpp @ 53:c2371bb6cf84 stable-3-5
3.5 - better error message when rejecting based on ns records on the sbl
| author | carl |
|---|---|
| date | Sat, 17 Jul 2004 11:14:11 -0700 |
| parents | 5ef10dc14457 |
| children | 44babba1a9b9 |
| 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; // "" |
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145 char * host_limit_message; // error message for excessive host names |
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146 int host_limit; // limit on host names |
| 44 | 147 bool host_random; // pick a random selection of host names rather than error for excessive hosts |
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148 char * tag_limit_message; // error message for excessive bad html tags |
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149 int tag_limit; // limit on bad html tags |
| 24 | 150 string_set html_tags; // set of valid html tags |
| 28 | 151 string_set tlds; // set of valid tld components |
| 0 | 152 CONFIG(); |
| 153 ~CONFIG(); | |
| 154 }; | |
| 155 CONFIG::CONFIG() { | |
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156 reference_count = 0; |
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157 generation = 0; |
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158 load_time = 0; |
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159 content_suffix = NULL; |
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160 content_message = NULL; |
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161 host_limit_message = NULL; |
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162 host_limit = 0; |
| 44 | 163 host_random = false; |
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164 tag_limit_message = NULL; |
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165 tag_limit = 0; |
| 0 | 166 } |
| 167 CONFIG::~CONFIG() { | |
| 168 for (dnsblp_map::iterator i=dnsbls.begin(); i!=dnsbls.end(); i++) { | |
| 169 DNSBLP d = (*i).second; | |
| 24 | 170 // delete the underlying DNSBL objects. |
| 0 | 171 delete d; |
| 172 } | |
| 173 for (dnsbllp_map::iterator i=dnsblls.begin(); i!=dnsblls.end(); i++) { | |
| 174 DNSBLLP d = (*i).second; | |
| 24 | 175 // *d is a list of pointers to DNSBL objects, but |
| 176 // the underlying objects have already been deleted above. | |
| 0 | 177 delete d; |
| 178 } | |
| 179 for (from_map::iterator i=env_from.begin(); i!=env_from.end(); i++) { | |
| 180 string_map *d = (*i).second; | |
| 181 delete d; | |
| 182 } | |
| 183 } | |
| 184 | |
| 16 | 185 static bool debug_syslog = false; |
| 18 | 186 static bool loader_run = true; // used to stop the config loader thread |
| 0 | 187 static string_set all_strings; // owns all the strings, only modified by the config loader thread |
| 188 static CONFIG * config = NULL; // protected by the config_mutex | |
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189 static int generation = 0; // protected by the config_mutex |
| 0 | 190 |
| 191 static pthread_mutex_t config_mutex; | |
| 192 static pthread_mutex_t syslog_mutex; | |
| 193 static pthread_mutex_t resolve_mutex; | |
| 194 | |
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195 struct mlfiPriv; |
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196 |
| 0 | 197 |
| 198 //////////////////////////////////////////////// | |
| 34 | 199 // helper to discard the strings and objects held by an ns_map |
| 200 // | |
| 201 static void discard(ns_map &s); | |
| 202 static void discard(ns_map &s) { | |
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203 for (string_map::iterator i=s.ns_host.begin(); i!=s.ns_host.end(); i++) { |
| 34 | 204 char *x = (*i).first; |
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205 char *y = (*i).second; |
| 34 | 206 free(x); |
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207 free(y); |
| 34 | 208 } |
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209 s.ns_ip.clear(); |
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210 s.ns_host.clear(); |
| 34 | 211 } |
| 212 | |
| 213 //////////////////////////////////////////////// | |
| 214 // helper to register a string in an ns_map | |
| 215 // | |
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216 static void register_string(ns_map &s, char *name, char *refer); |
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217 static void register_string(ns_map &s, char *name, char *refer) { |
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218 string_map::iterator i = s.ns_host.find(name); |
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219 if (i != s.ns_host.end()) return; |
| 34 | 220 char *x = strdup(name); |
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221 char *y = strdup(refer); |
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222 s.ns_ip[x] = 0; |
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223 s.ns_host[x] = y; |
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224 |
| 34 | 225 } |
| 226 | |
| 227 //////////////////////////////////////////////// | |
| 8 | 228 // helper to discard the strings held by a string_set |
| 0 | 229 // |
| 9 | 230 static void discard(string_set &s); |
| 231 static void discard(string_set &s) { | |
| 8 | 232 for (string_set::iterator i=s.begin(); i!=s.end(); i++) { |
| 233 free(*i); | |
| 234 } | |
| 9 | 235 s.clear(); |
| 8 | 236 } |
| 0 | 237 |
| 12 | 238 //////////////////////////////////////////////// |
| 239 // helper to register a string in a string set | |
| 240 // | |
| 241 static char* register_string(string_set &s, char *name); | |
| 242 static char* register_string(string_set &s, char *name) { | |
| 243 string_set::iterator i = s.find(name); | |
| 244 if (i != s.end()) return *i; | |
| 245 char *x = strdup(name); | |
| 246 s.insert(x); | |
| 247 return x; | |
| 248 } | |
| 249 | |
| 16 | 250 //////////////////////////////////////////////// |
| 251 // syslog a message | |
| 252 // | |
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253 static void my_syslog(mlfiPriv *priv, char *text); |
| 16 | 254 |
| 255 | |
| 12 | 256 // include the content scanner |
| 257 #include "scanner.cpp" | |
| 258 | |
| 259 | |
| 0 | 260 //////////////////////////////////////////////// |
| 261 // mail filter private data, held for us by sendmail | |
| 262 // | |
| 263 struct mlfiPriv | |
| 264 { | |
| 8 | 265 // connection specific data |
| 266 CONFIG *pc; // global context with our maps | |
| 267 int ip; // ip4 address of the smtp client | |
| 268 map<DNSBLP, status> checked; // status from those lists | |
| 269 // message specific data | |
| 0 | 270 char *mailaddr; // envelope from value |
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271 char *queueid; // sendmail queue id |
| 0 | 272 bool authenticated; // client authenticated? if so, suppress all dnsbl checks |
| 8 | 273 bool have_whites; // have at least one whitelisted recipient? need to accept content and remove all non-whitelisted recipients if it fails |
| 274 bool only_whites; // every recipient is whitelisted? | |
| 24 | 275 string_set non_whites; // remember the non-whitelisted recipients so we can remove them if need be |
| 276 recorder *memory; // memory for the content scanner | |
| 8 | 277 url_scanner *scanner; // object to handle body scanning |
| 0 | 278 mlfiPriv(); |
| 279 ~mlfiPriv(); | |
| 8 | 280 void reset(bool final = false); // for a new message |
| 0 | 281 }; |
| 282 mlfiPriv::mlfiPriv() { | |
| 283 pthread_mutex_lock(&config_mutex); | |
| 284 pc = config; | |
| 285 pc->reference_count++; | |
| 286 pthread_mutex_unlock(&config_mutex); | |
| 8 | 287 ip = 0; |
| 288 mailaddr = NULL; | |
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289 queueid = NULL; |
| 8 | 290 authenticated = false; |
| 291 have_whites = false; | |
| 292 only_whites = true; | |
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293 memory = new recorder(this, &pc->html_tags, &pc->tlds); |
| 24 | 294 scanner = new url_scanner(memory); |
| 0 | 295 } |
| 296 mlfiPriv::~mlfiPriv() { | |
| 297 pthread_mutex_lock(&config_mutex); | |
| 298 pc->reference_count--; | |
| 299 pthread_mutex_unlock(&config_mutex); | |
| 8 | 300 reset(true); |
| 301 } | |
| 302 void mlfiPriv::reset(bool final) { | |
| 0 | 303 if (mailaddr) free(mailaddr); |
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304 if (queueid) free(queueid); |
| 24 | 305 discard(non_whites); |
| 306 delete memory; | |
| 8 | 307 delete scanner; |
| 308 if (!final) { | |
| 309 mailaddr = NULL; | |
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310 queueid = NULL; |
| 8 | 311 authenticated = false; |
| 312 have_whites = false; | |
| 313 only_whites = true; | |
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314 memory = new recorder(this, &pc->html_tags, &pc->tlds); |
| 24 | 315 scanner = new url_scanner(memory); |
| 8 | 316 } |
| 0 | 317 } |
| 318 | |
| 319 #define MLFIPRIV ((struct mlfiPriv *) smfi_getpriv(ctx)) | |
| 320 | |
| 321 | |
| 322 //////////////////////////////////////////////// | |
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323 // syslog a message |
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324 // |
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325 static void my_syslog(mlfiPriv *priv, char *text) { |
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326 char buf[1000]; |
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327 if (priv) { |
| 42 | 328 snprintf(buf, sizeof(buf), "%s: %s", priv->queueid, text); |
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329 text = buf; |
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330 } |
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331 pthread_mutex_lock(&syslog_mutex); |
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332 openlog("dnsbl", LOG_PID, LOG_MAIL); |
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333 syslog(LOG_NOTICE, "%s", text); |
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334 closelog(); |
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335 pthread_mutex_unlock(&syslog_mutex); |
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336 } |
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337 |
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338 static void my_syslog(char *text); |
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339 static void my_syslog(char *text) { |
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340 my_syslog(NULL, text); |
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341 } |
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342 |
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343 //////////////////////////////////////////////// |
| 0 | 344 // register a global string |
| 345 // | |
| 346 static char* register_string(char *name); | |
| 347 static char* register_string(char *name) { | |
| 12 | 348 return register_string(all_strings, name); |
| 0 | 349 } |
| 350 | |
| 351 | |
| 352 static char* next_token(char *delim); | |
| 353 static char* next_token(char *delim) { | |
| 354 char *name = strtok(NULL, delim); | |
| 355 if (!name) return name; | |
| 356 return register_string(name); | |
| 357 } | |
| 358 | |
| 359 | |
| 360 //////////////////////////////////////////////// | |
| 361 // lookup an email address in the env_from or env_to maps | |
| 362 // | |
| 363 static char* lookup1(char *email, string_map map); | |
| 364 static char* lookup1(char *email, string_map map) { | |
| 365 string_map::iterator i = map.find(email); | |
| 366 if (i != map.end()) return (*i).second; | |
| 367 char *x = strchr(email, '@'); | |
| 368 if (!x) return DEFAULT; | |
| 369 x++; | |
| 370 i = map.find(x); | |
| 371 if (i != map.end()) return (*i).second; | |
| 372 return DEFAULT; | |
| 373 } | |
| 374 | |
| 375 | |
| 376 //////////////////////////////////////////////// | |
| 377 // lookup an email address in the env_from or env_to maps | |
| 378 // this email address is passed in from sendmail, and will | |
| 379 // always be enclosed in <>. It may have mixed case, just | |
| 380 // as the mail client sent it. | |
| 381 // | |
| 382 static char* lookup(char* email, string_map map); | |
| 383 static char* lookup(char* email, string_map map) { | |
| 384 int n = strlen(email)-2; | |
| 385 if (n < 1) return DEFAULT; // malformed | |
| 386 char *key = strdup(email+1); | |
| 387 key[n] = '\0'; | |
| 388 for (int i=0; i<n; i++) key[i] = tolower(key[i]); | |
| 389 char *rc = lookup1(key, map); | |
| 390 free(key); | |
| 391 return rc; | |
| 392 } | |
| 393 | |
| 394 | |
| 395 //////////////////////////////////////////////// | |
| 396 // find the dnsbl with a specific name | |
| 397 // | |
| 398 static DNSBLP find_dnsbl(CONFIG &dc, char *name); | |
| 399 static DNSBLP find_dnsbl(CONFIG &dc, char *name) { | |
| 400 dnsblp_map::iterator i = dc.dnsbls.find(name); | |
| 401 if (i == dc.dnsbls.end()) return NULL; | |
| 402 return (*i).second; | |
| 403 } | |
| 404 | |
| 405 | |
| 406 //////////////////////////////////////////////// | |
| 407 // find the dnsbll with a specific name | |
| 408 // | |
| 409 static DNSBLLP find_dnsbll(CONFIG &dc, char *name); | |
| 410 static DNSBLLP find_dnsbll(CONFIG &dc, char *name) { | |
| 411 dnsbllp_map::iterator i = dc.dnsblls.find(name); | |
| 412 if (i == dc.dnsblls.end()) return NULL; | |
| 413 return (*i).second; | |
| 414 } | |
| 415 | |
| 416 | |
| 417 //////////////////////////////////////////////// | |
| 418 // find the envfrom map with a specific name | |
| 419 // | |
| 420 static string_map* find_from_map(CONFIG &dc, char *name); | |
| 421 static string_map* find_from_map(CONFIG &dc, char *name) { | |
| 422 from_map::iterator i = dc.env_from.find(name); | |
| 423 if (i == dc.env_from.end()) return NULL; | |
| 424 return (*i).second; | |
| 425 } | |
| 426 | |
| 427 | |
| 428 static string_map& really_find_from_map(CONFIG &dc, char *name); | |
| 429 static string_map& really_find_from_map(CONFIG &dc, char *name) { | |
| 430 string_map *sm = find_from_map(dc, name); | |
| 431 if (!sm) { | |
| 432 sm = new string_map; | |
| 433 dc.env_from[name] = sm; | |
| 434 } | |
| 435 return *sm; | |
| 436 } | |
| 437 | |
| 438 | |
| 439 //////////////////////////////////////////////// | |
| 8 | 440 // |
| 441 // ask a dns question and get an A record answer - we don't try | |
| 442 // very hard, just using the default resolver retry settings. | |
| 443 // If we cannot get an answer, we just accept the mail. The | |
| 444 // caller must ensure thread safety. | |
| 445 // | |
| 0 | 446 // |
| 34 | 447 static int dns_interface(char *question, bool maybe_ip, ns_map *nameservers); |
| 448 static int dns_interface(char *question, bool maybe_ip, ns_map *nameservers) { | |
| 16 | 449 #ifdef NS_PACKETSZ |
| 8 | 450 u_char answer[NS_PACKETSZ]; |
| 451 int length = res_search(question, ns_c_in, ns_t_a, answer, sizeof(answer)); | |
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452 if (length >= 0) { // no error yet |
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453 // parse the answer |
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454 ns_msg handle; |
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455 ns_rr rr; |
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456 if (ns_initparse(answer, length, &handle) == 0) { |
| 34 | 457 // look for ns names |
| 458 if (nameservers) { | |
| 459 ns_map &ns = *nameservers; | |
| 460 int rrnum = 0; | |
| 461 while (ns_parserr(&handle, ns_s_ns, rrnum++, &rr) == 0) { | |
| 462 if (ns_rr_type(rr) == ns_t_ns) { | |
| 463 char nam[NS_MAXDNAME+1]; | |
| 464 char *n = nam; | |
| 465 const u_char *p = ns_rr_rdata(rr); | |
| 466 while (((n-nam) < NS_MAXDNAME) && ((p-answer) < length) && *p) { | |
| 467 size_t s = *(p++); | |
| 468 if (s > 191) { | |
| 469 // compression pointer | |
| 470 s = (s-192)*256 + *(p++); | |
| 471 if (s >= length) break; // pointer outside bounds of answer | |
| 472 p = answer + s; | |
| 473 s = *(p++); | |
| 474 } | |
| 475 if (s > 0) { | |
| 476 if ((n-nam) >= (NS_MAXDNAME-s)) break; // destination would overflow name buffer | |
| 477 if ((p-answer) >= (length-s)) break; // source outside bounds of answer | |
| 478 memcpy(n, p, s); | |
| 479 n += s; | |
| 480 p += s; | |
| 481 *(n++) = '.'; | |
| 482 } | |
| 483 } | |
| 36 | 484 if (n-nam) n--; // remove trailing . |
| 485 *n = '\0'; // null terminate it | |
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486 register_string(ns, nam, question); // ns host to lookup later |
| 34 | 487 } |
| 488 } | |
| 489 rrnum = 0; | |
| 490 while (ns_parserr(&handle, ns_s_ar, rrnum++, &rr) == 0) { | |
| 491 if (ns_rr_type(rr) == ns_t_a) { | |
| 492 char* nam = (char*)ns_rr_name(rr); | |
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493 ns_mapper::iterator i = ns.ns_ip.find(nam); |
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494 if (i != ns.ns_ip.end()) { |
| 34 | 495 // we want this ip address |
| 496 int address; | |
| 497 memcpy(&address, ns_rr_rdata(rr), sizeof(address)); | |
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498 ns.ns_ip[nam] = address; |
| 34 | 499 } |
| 500 } | |
| 501 } | |
| 502 } | |
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503 int rrnum = 0; |
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504 while (ns_parserr(&handle, ns_s_an, rrnum++, &rr) == 0) { |
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505 if (ns_rr_type(rr) == ns_t_a) { |
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506 int address; |
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507 memcpy(&address, ns_rr_rdata(rr), sizeof(address)); |
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508 return address; |
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509 } |
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510 } |
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511 } |
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512 } |
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513 if (maybe_ip) { |
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514 // might be a bare ip address |
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515 in_addr ip; |
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516 if (inet_aton(question, &ip)) { |
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517 return ip.s_addr; |
| 8 | 518 } |
| 519 } | |
| 520 return 0; | |
| 16 | 521 #else |
| 522 struct hostent *host = gethostbyname(question); | |
| 523 if (!host) return 0; | |
| 524 if (host->h_addrtype != AF_INET) return 0; | |
| 525 int address; | |
| 526 memcpy(&address, host->h_addr, sizeof(address)); | |
| 527 return address; | |
| 528 #endif | |
| 8 | 529 } |
| 530 | |
| 34 | 531 static int protected_dns_interface(char *question, bool maybe_ip, ns_map *nameservers); |
| 532 static int protected_dns_interface(char *question, bool maybe_ip, ns_map *nameservers) { | |
| 8 | 533 int ans; |
| 534 pthread_mutex_lock(&resolve_mutex); | |
| 34 | 535 ans = dns_interface(question, maybe_ip, nameservers); |
| 8 | 536 pthread_mutex_unlock(&resolve_mutex); |
| 537 return ans; | |
| 538 | |
| 539 } | |
| 540 | |
| 541 //////////////////////////////////////////////// | |
| 542 // check a single dnsbl | |
| 543 // | |
| 544 static status check_single(int ip, char *suffix); | |
| 545 static status check_single(int ip, char *suffix) { | |
| 0 | 546 // make a dns question |
| 547 const u_char *src = (const u_char *)&ip; | |
| 548 if (src[0] == 127) return oksofar; // don't do dns lookups on localhost | |
| 16 | 549 #ifdef NS_MAXDNAME |
| 0 | 550 char question[NS_MAXDNAME]; |
| 16 | 551 #else |
| 552 char question[1000]; | |
| 553 #endif | |
| 8 | 554 snprintf(question, sizeof(question), "%u.%u.%u.%u.%s.", src[3], src[2], src[1], src[0], suffix); |
| 555 // ask the question, if we get an A record it implies a blacklisted ip address | |
| 34 | 556 return (protected_dns_interface(question, false, NULL)) ? reject : oksofar; |
| 8 | 557 } |
| 558 | |
| 559 | |
| 560 //////////////////////////////////////////////// | |
| 561 // check a single dnsbl | |
| 562 // | |
| 563 static status check_single(int ip, DNSBL &bl); | |
| 564 static status check_single(int ip, DNSBL &bl) { | |
| 565 return check_single(ip, bl.suffix); | |
| 0 | 566 } |
| 567 | |
| 568 | |
| 569 //////////////////////////////////////////////// | |
| 570 // check the dnsbls specified for this recipient | |
| 571 // | |
| 572 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist); | |
| 573 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist) { | |
| 574 if (priv.authenticated) return oksofar; | |
| 575 if (!dnsbllp) return oksofar; | |
| 576 DNSBLL &dnsbll = *dnsbllp; | |
| 577 for (DNSBLL::iterator i=dnsbll.begin(); i!=dnsbll.end(); i++) { | |
| 578 DNSBLP dp = *i; // non null by construction | |
| 579 status st; | |
| 580 map<DNSBLP, status>::iterator f = priv.checked.find(dp); | |
| 581 if (f == priv.checked.end()) { | |
| 582 // have not checked this list yet | |
| 8 | 583 st = check_single(priv.ip, *dp); |
| 0 | 584 rejectlist = dp; |
| 585 priv.checked[dp] = st; | |
| 586 } | |
| 587 else { | |
| 588 st = (*f).second; | |
| 589 rejectlist = (*f).first; | |
| 590 } | |
| 591 if (st == reject) return st; | |
| 592 } | |
| 593 return oksofar; | |
| 594 } | |
| 595 | |
| 596 | |
| 597 //////////////////////////////////////////////// | |
| 8 | 598 // check the dnsbls specified for this recipient |
| 599 // | |
| 16 | 600 static status check_hosts(mlfiPriv &priv, char *&host, int &ip); |
| 601 static status check_hosts(mlfiPriv &priv, char *&host, int &ip) { | |
| 8 | 602 CONFIG &dc = *priv.pc; |
| 603 if (!dc.content_suffix) return oksofar; | |
| 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 |
| 612 if ((cnt > lim) && (lim > 0) && ran) { | |
| 613 // try to only look at lim/cnt fraction of the available cnt host names | |
| 614 int r = rand() % cnt; | |
| 615 if (r >= lim) { | |
| 616 char buf[1000]; | |
| 617 snprintf(buf, sizeof(buf), "host %s skipped", host); | |
| 618 my_syslog(&priv, buf); | |
| 619 continue; | |
| 620 } | |
| 621 } | |
| 8 | 622 count++; |
| 44 | 623 if ((count > lim) && (lim > 0) && (!ran)) { |
| 34 | 624 discard(nameservers); |
| 625 return reject_host; | |
| 626 } | |
| 44 | 627 ip = protected_dns_interface(host, true, &nameservers); |
| 16 | 628 if (debug_syslog) { |
| 44 | 629 char buf[1000]; |
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630 if (ip) { |
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631 char adr[sizeof "255.255.255.255"]; |
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632 adr[0] = '\0'; |
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633 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); |
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634 snprintf(buf, sizeof(buf), "host %s found at %s", host, adr); |
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635 } |
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636 else { |
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637 snprintf(buf, sizeof(buf), "host %s not found", host); |
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638 } |
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639 my_syslog(&priv, buf); |
| 16 | 640 } |
| 8 | 641 if (ip) { |
| 44 | 642 int_set::iterator i = ips.find(ip); |
| 643 if (i == ips.end()) { | |
| 644 ips.insert(ip); | |
| 645 status st = check_single(ip, dc.content_suffix); | |
| 646 if (st == reject) { | |
| 647 discard(nameservers); | |
| 648 return st; | |
| 649 } | |
| 34 | 650 } |
| 8 | 651 } |
| 652 } | |
| 34 | 653 lim *= 4; // allow average of 3 ns per host name |
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654 for (ns_mapper::iterator i=nameservers.ns_ip.begin(); i!=nameservers.ns_ip.end(); i++) { |
| 34 | 655 count++; |
| 656 if ((count > lim) && (lim > 0)) { | |
| 44 | 657 if (ran) continue; // don't complain |
| 34 | 658 discard(nameservers); |
| 659 return reject_host; | |
| 660 } | |
| 36 | 661 host = (*i).first; // a transient reference that needs to be replaced before we return it |
| 34 | 662 ip = (*i).second; |
| 663 if (!ip) ip = protected_dns_interface(host, false, NULL); | |
| 664 if (debug_syslog) { | |
| 665 char buf[200]; | |
| 666 if (ip) { | |
| 667 char adr[sizeof "255.255.255.255"]; | |
| 668 adr[0] = '\0'; | |
| 669 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
| 670 snprintf(buf, sizeof(buf), "ns %s found at %s", host, adr); | |
| 671 } | |
| 672 else { | |
| 673 snprintf(buf, sizeof(buf), "ns %s not found", host); | |
| 674 } | |
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675 my_syslog(&priv, buf); |
| 34 | 676 } |
| 677 if (ip) { | |
| 44 | 678 int_set::iterator i = ips.find(ip); |
| 679 if (i == ips.end()) { | |
| 680 ips.insert(ip); | |
| 681 status st = check_single(ip, dc.content_suffix); | |
| 682 if (st == reject) { | |
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683 string_map::iterator j = nameservers.ns_host.find(host); |
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684 if (j != nameservers.ns_host.end()) { |
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685 char *refer = (*j).second; |
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686 char buf[1000]; |
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687 snprintf(buf, sizeof(buf), "%s with nameserver %s", refer, host); |
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688 host = register_string(priv.memory->hosts, buf); // put a copy into priv.memory->hosts, and return that reference |
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689 } |
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690 else { |
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691 host = register_string(priv.memory->hosts, host); // put a copy into priv.memory->hosts, and return that reference |
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692 } |
| 44 | 693 discard(nameservers); |
| 694 return st; | |
| 695 } | |
| 34 | 696 } |
| 697 } | |
| 698 } | |
| 699 discard(nameservers); | |
| 24 | 700 host = NULL; |
| 26 | 701 int bin = priv.memory->binary_tags; |
| 24 | 702 int bad = priv.memory->bad_html_tags; |
| 34 | 703 lim = priv.pc->tag_limit; |
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704 if (3*bin > bad) return oksofar; // probably .zip or .tar.gz with random content |
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705 if ((bad > lim) && (lim > 0)) return reject_tag; |
| 9 | 706 return oksofar; |
| 8 | 707 } |
| 708 | |
| 709 | |
| 710 //////////////////////////////////////////////// | |
| 0 | 711 // start of sendmail milter interfaces |
| 712 // | |
| 713 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr) | |
| 714 { | |
| 715 // allocate some private memory | |
| 716 mlfiPriv *priv = new mlfiPriv; | |
| 717 if (hostaddr->sa_family == AF_INET) { | |
| 718 priv->ip = ((struct sockaddr_in *)hostaddr)->sin_addr.s_addr; | |
| 719 } | |
| 720 | |
| 721 // save the private data | |
| 722 smfi_setpriv(ctx, (void*)priv); | |
| 723 | |
| 724 // continue processing | |
| 725 return SMFIS_CONTINUE; | |
| 726 } | |
| 727 | |
| 728 sfsistat mlfi_envfrom(SMFICTX *ctx, char **from) | |
| 729 { | |
| 730 mlfiPriv &priv = *MLFIPRIV; | |
| 731 priv.mailaddr = strdup(from[0]); | |
| 732 priv.authenticated = (smfi_getsymval(ctx, "{auth_authen}") != NULL); | |
| 733 return SMFIS_CONTINUE; | |
| 734 } | |
| 735 | |
| 736 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **rcpt) | |
| 737 { | |
| 738 DNSBLP rejectlist = NULL; // list that caused the reject | |
| 739 status st = oksofar; | |
| 740 mlfiPriv &priv = *MLFIPRIV; | |
| 741 CONFIG &dc = *priv.pc; | |
| 42 | 742 if (!priv.queueid) priv.queueid = strdup(smfi_getsymval(ctx, "i")); |
| 0 | 743 char *rcptaddr = rcpt[0]; |
| 744 char *dnsname = lookup(rcptaddr, dc.env_to_dnsbll); | |
| 745 char *fromname = lookup(rcptaddr, dc.env_to_chkfrom); | |
| 746 if ((strcmp(dnsname, BLACK) == 0) || | |
| 747 (strcmp(fromname, BLACK) == 0)) { | |
| 748 st = black; // two options to blacklist this recipient | |
| 749 } | |
| 750 else if (strcmp(fromname, WHITE) == 0) { | |
| 751 st = white; | |
| 752 } | |
| 753 else { | |
| 754 // check an env_from map | |
| 755 string_map *sm = find_from_map(dc, fromname); | |
| 756 if (sm != NULL) { | |
| 757 fromname = lookup(priv.mailaddr, *sm); // returns default if name not in map | |
| 758 if (strcmp(fromname, BLACK) == 0) { | |
| 759 st = black; // blacklist this envelope from value | |
| 760 } | |
| 761 if (strcmp(fromname, WHITE) == 0) { | |
| 762 st = white; // blacklist this envelope from value | |
| 763 } | |
| 764 } | |
| 765 } | |
| 766 if ((st == oksofar) && (strcmp(dnsname, WHITE) != 0)) { | |
| 767 // check dns lists | |
| 768 st = check_dnsbl(priv, find_dnsbll(dc, dnsname), rejectlist); | |
| 769 } | |
| 770 | |
| 771 if (st == reject) { | |
| 772 // reject the recipient based on some dnsbl | |
| 773 char adr[sizeof "255.255.255.255"]; | |
| 774 adr[0] = '\0'; | |
| 8 | 775 inet_ntop(AF_INET, (const u_char *)&priv.ip, adr, sizeof(adr)); |
| 0 | 776 char buf[2000]; |
| 777 snprintf(buf, sizeof(buf), rejectlist->message, adr, adr); | |
| 778 smfi_setreply(ctx, "550", "5.7.1", buf); | |
| 779 return SMFIS_REJECT; | |
| 780 } | |
| 781 else if (st == black) { | |
| 782 // reject the recipient based on blacklisting either from or to | |
| 783 smfi_setreply(ctx, "550", "5.7.1", "no such user"); | |
| 784 return SMFIS_REJECT; | |
| 785 } | |
| 786 else { | |
| 787 // accept the recipient | |
| 8 | 788 if (st == oksofar) { |
| 789 // but remember the non-whites | |
| 12 | 790 register_string(priv.non_whites, rcptaddr); |
| 8 | 791 priv.only_whites = false; |
| 792 } | |
| 793 if (st == white) { | |
| 794 priv.have_whites = true; | |
| 795 } | |
| 0 | 796 return SMFIS_CONTINUE; |
| 797 } | |
| 798 } | |
| 799 | |
| 8 | 800 sfsistat mlfi_body(SMFICTX *ctx, u_char *data, size_t len) |
| 0 | 801 { |
| 802 mlfiPriv &priv = *MLFIPRIV; | |
| 8 | 803 if (priv.authenticated) return SMFIS_CONTINUE; |
| 804 if (priv.only_whites) return SMFIS_CONTINUE; | |
| 805 priv.scanner->scan(data, len); | |
| 11 | 806 return SMFIS_CONTINUE; |
| 8 | 807 } |
| 808 | |
| 809 sfsistat mlfi_eom(SMFICTX *ctx) | |
| 810 { | |
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811 sfsistat rc; |
| 8 | 812 mlfiPriv &priv = *MLFIPRIV; |
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813 char *host = NULL; |
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814 int ip; |
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815 status st; |
| 8 | 816 // process end of message |
| 817 if (priv.authenticated || | |
| 818 priv.only_whites || | |
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819 ((st=check_hosts(priv, host, ip)) == oksofar)) rc = SMFIS_CONTINUE; |
| 8 | 820 else { |
| 821 if (!priv.have_whites) { | |
| 822 // can reject the entire message | |
| 823 char buf[2000]; | |
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824 if (st == reject_tag) { |
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825 // rejected due to excessive bad html tags |
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826 snprintf(buf, sizeof(buf), priv.pc->tag_limit_message); |
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827 } |
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828 else if (st == reject_host) { |
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829 // rejected due to excessive unique host/urls |
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830 snprintf(buf, sizeof(buf), priv.pc->host_limit_message); |
| 24 | 831 } |
| 832 else { | |
| 833 char adr[sizeof "255.255.255.255"]; | |
| 834 adr[0] = '\0'; | |
| 835 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
| 836 snprintf(buf, sizeof(buf), priv.pc->content_message, host, adr); | |
| 837 } | |
| 8 | 838 smfi_setreply(ctx, "550", "5.7.1", buf); |
| 839 rc = SMFIS_REJECT; | |
| 840 } | |
| 841 else { | |
| 842 // need to accept it but remove the recipients that don't want it | |
| 843 for (string_set::iterator i=priv.non_whites.begin(); i!=priv.non_whites.end(); i++) { | |
| 844 char *rcpt = *i; | |
| 845 smfi_delrcpt(ctx, rcpt); | |
| 846 } | |
| 847 rc = SMFIS_CONTINUE; | |
| 848 } | |
| 0 | 849 } |
| 8 | 850 // reset for a new message on the same connection |
| 851 mlfi_abort(ctx); | |
| 852 return rc; | |
| 853 } | |
| 854 | |
| 855 sfsistat mlfi_abort(SMFICTX *ctx) | |
| 856 { | |
| 857 mlfiPriv &priv = *MLFIPRIV; | |
| 858 priv.reset(); | |
| 0 | 859 return SMFIS_CONTINUE; |
| 860 } | |
| 861 | |
| 862 sfsistat mlfi_close(SMFICTX *ctx) | |
| 863 { | |
| 864 mlfiPriv *priv = MLFIPRIV; | |
| 865 if (!priv) return SMFIS_CONTINUE; | |
| 866 delete priv; | |
| 867 smfi_setpriv(ctx, NULL); | |
| 868 return SMFIS_CONTINUE; | |
| 869 } | |
| 870 | |
| 871 struct smfiDesc smfilter = | |
| 872 { | |
| 873 "DNSBL", // filter name | |
| 874 SMFI_VERSION, // version code -- do not change | |
| 875 SMFIF_DELRCPT, // flags | |
| 876 mlfi_connect, // connection info filter | |
| 877 NULL, // SMTP HELO command filter | |
| 878 mlfi_envfrom, // envelope sender filter | |
| 879 mlfi_envrcpt, // envelope recipient filter | |
| 880 NULL, // header filter | |
| 881 NULL, // end of header | |
| 8 | 882 mlfi_body, // body block filter |
| 883 mlfi_eom, // end of message | |
| 884 mlfi_abort, // message aborted | |
| 0 | 885 mlfi_close, // connection cleanup |
| 886 }; | |
| 887 | |
| 888 | |
| 889 static void dumpit(char *name, string_map map); | |
| 890 static void dumpit(char *name, string_map map) { | |
| 9 | 891 fprintf(stdout, "\n"); |
| 0 | 892 for (string_map::iterator i=map.begin(); i!=map.end(); i++) { |
| 9 | 893 fprintf(stdout, "%s %s->%s\n", name, (*i).first, (*i).second); |
| 0 | 894 } |
| 895 } | |
| 896 | |
| 897 | |
| 898 static void dumpit(from_map map); | |
| 899 static void dumpit(from_map map) { | |
| 900 for (from_map::iterator i=map.begin(); i!=map.end(); i++) { | |
| 3 | 901 char buf[2000]; |
| 902 snprintf(buf, sizeof(buf), "envelope from map for %s", (*i).first); | |
| 0 | 903 string_map *sm = (*i).second; |
| 3 | 904 dumpit(buf, *sm); |
| 0 | 905 } |
| 906 } | |
| 907 | |
| 908 | |
| 3 | 909 static void dumpit(CONFIG &dc); |
| 910 static void dumpit(CONFIG &dc) { | |
| 5 | 911 dumpit(dc.env_from); |
| 912 dumpit("envelope to (dnsbl list)", dc.env_to_dnsbll); | |
| 913 dumpit("envelope to (from map)", dc.env_to_chkfrom); | |
| 9 | 914 fprintf(stdout, "\ndnsbls\n"); |
| 0 | 915 for (dnsblp_map::iterator i=dc.dnsbls.begin(); i!=dc.dnsbls.end(); i++) { |
| 9 | 916 fprintf(stdout, "%s %s %s\n", (*i).first, (*i).second->suffix, (*i).second->message); |
| 0 | 917 } |
| 9 | 918 fprintf(stdout, "\ndnsbl_lists\n"); |
| 0 | 919 for (dnsbllp_map::iterator i=dc.dnsblls.begin(); i!=dc.dnsblls.end(); i++) { |
| 920 char *name = (*i).first; | |
| 921 DNSBLL &dl = *((*i).second); | |
| 9 | 922 fprintf(stdout, "%s", name); |
| 0 | 923 for (DNSBLL::iterator j=dl.begin(); j!=dl.end(); j++) { |
| 924 DNSBL &d = **j; | |
| 9 | 925 fprintf(stdout, " %s", d.suffix); |
| 0 | 926 } |
| 9 | 927 fprintf(stdout, "\n"); |
| 0 | 928 } |
| 9 | 929 if (dc.content_suffix) { |
| 930 fprintf(stdout, "\ncontent filtering enabled with %s %s\n", dc.content_suffix, dc.content_message); | |
| 931 } | |
| 46 | 932 if (dc.host_limit && !dc.host_random) { |
| 933 fprintf(stdout, "\ncontent filtering for host names hard limit %d %s\n", dc.host_limit, dc.host_limit_message); | |
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934 } |
| 46 | 935 if (dc.host_limit && dc.host_random) { |
| 936 fprintf(stdout, "\ncontent filtering for host names soft limit %d\n", dc.host_limit); | |
| 44 | 937 } |
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938 if (dc.tag_limit) { |
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939 fprintf(stdout, "\ncontent filtering for excessive html tags enabled with limit %d %s\n", dc.tag_limit, dc.tag_limit_message); |
| 24 | 940 } |
| 9 | 941 fprintf(stdout, "\nfiles\n"); |
| 3 | 942 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { |
| 943 char *f = *i; | |
| 9 | 944 fprintf(stdout, "config includes %s\n", f); |
| 3 | 945 } |
| 946 } | |
| 947 | |
| 948 | |
| 949 //////////////////////////////////////////////// | |
| 950 // check for redundant or recursive include files | |
| 951 // | |
| 952 static bool ok_to_include(CONFIG &dc, char *fn); | |
| 953 static bool ok_to_include(CONFIG &dc, char *fn) { | |
| 954 if (!fn) return false; | |
| 955 bool ok = true; | |
| 956 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 957 char *f = *i; | |
| 958 if (strcmp(f, fn) == 0) { | |
| 959 my_syslog("redundant or recursive include file detected"); | |
| 960 ok = false; | |
| 961 break; | |
| 962 } | |
| 963 } | |
| 964 return ok; | |
| 0 | 965 } |
| 966 | |
| 967 | |
| 968 //////////////////////////////////////////////// | |
| 969 // load a single config file | |
| 970 // | |
| 3 | 971 static void load_conf_dcc(CONFIG &dc, char *name, char *fn); |
| 972 static void load_conf_dcc(CONFIG &dc, char *name, char *fn) { | |
| 973 ifstream is(fn); | |
| 40 | 974 if (is.fail()) { |
| 975 char buf[1000]; | |
| 976 snprintf(buf, sizeof(buf), "include file %s not found", fn); | |
| 977 my_syslog(buf); | |
| 978 return; | |
| 979 } | |
| 39 | 980 dc.config_files.push_back(fn); |
| 981 const int LINE_SIZE = 2000; | |
| 3 | 982 char line[LINE_SIZE]; |
| 39 | 983 char *list = BLACK; |
| 3 | 984 char *delim = " \t"; |
| 985 int curline = 0; | |
| 986 while (!is.eof()) { | |
| 987 is.getline(line, LINE_SIZE); | |
| 988 curline++; | |
| 989 int n = strlen(line); | |
| 990 if (!n) continue; | |
| 991 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 992 if (line[0] == '#') continue; | |
| 993 char *head = line; | |
| 994 if (strspn(line, delim) == 0) { | |
| 995 // have a leading ok/many tag to fetch | |
| 996 char *cmd = strtok(line, delim); | |
| 997 if (strcmp(cmd, MANY) == 0) list = BLACK; | |
| 998 else if (strcmp(cmd, OK) == 0) list = WHITE; | |
| 999 head = cmd + strlen(cmd) + 1; | |
| 1000 } | |
| 1001 char *cmd = strtok(head, delim); | |
| 1002 if (!cmd) continue; | |
| 1003 if (strcmp(cmd, "env_from") == 0) { | |
| 1004 char *from = next_token(delim); | |
| 1005 if (from) { | |
| 1006 string_map &fm = really_find_from_map(dc, name); | |
| 1007 fm[from] = list; | |
| 1008 } | |
| 1009 } | |
| 1010 else if (strcmp(cmd, "env_to") == 0) { | |
| 1011 char *to = next_token(delim); | |
| 1012 if (to) { | |
| 1013 dc.env_to_dnsbll[to] = list; | |
| 1014 dc.env_to_chkfrom[to] = list; | |
| 1015 } | |
| 1016 } | |
| 1017 else if (strcmp(cmd, "substitute") == 0) { | |
| 1018 char *tag = next_token(delim); | |
| 1019 if (tag && (strcmp(tag, "mail_host") == 0)) { | |
| 1020 char *from = next_token(delim); | |
| 1021 if (from) { | |
| 1022 string_map &fm = really_find_from_map(dc, name); | |
| 1023 fm[from] = list; | |
| 1024 } | |
| 1025 } | |
| 1026 } | |
| 1027 else if (strcmp(cmd, "include") == 0) { | |
| 1028 char *fn = next_token(delim); | |
| 1029 if (ok_to_include(dc, fn)) { | |
| 1030 load_conf_dcc(dc, name, fn); | |
| 1031 } | |
| 1032 } | |
| 1033 | |
| 1034 } | |
| 1035 is.close(); | |
| 1036 } | |
| 1037 | |
| 1038 | |
| 0 | 1039 static void load_conf(CONFIG &dc, char *fn); |
| 1040 static void load_conf(CONFIG &dc, char *fn) { | |
| 39 | 1041 ifstream is(fn); |
| 40 | 1042 if (is.fail()) { |
| 1043 char buf[1000]; | |
| 1044 snprintf(buf, sizeof(buf), "include file %s not found", fn); | |
| 1045 my_syslog(buf); | |
| 1046 return; | |
| 1047 } | |
| 0 | 1048 dc.config_files.push_back(fn); |
| 1049 map<char*, int, ltstr> commands; | |
| 46 | 1050 enum {dummy, tld, content, hostlimit, hostslimit, htmllimit, htmltag, dnsbl, dnsbll, envfrom, envto, include, includedcc}; |
| 1051 commands["tld" ] = tld; | |
| 1052 commands["content" ] = content; | |
| 1053 commands["host_limit" ] = hostlimit; | |
| 1054 commands["host_soft_limit"] = hostslimit; | |
| 1055 commands["html_limit" ] = htmllimit; | |
| 1056 commands["html_tag" ] = htmltag; | |
| 1057 commands["dnsbl" ] = dnsbl; | |
| 1058 commands["dnsbl_list" ] = dnsbll; | |
| 1059 commands["env_from" ] = envfrom; | |
| 1060 commands["env_to" ] = envto; | |
| 1061 commands["include" ] = include; | |
| 1062 commands["include_dcc" ] = includedcc; | |
| 0 | 1063 const int LINE_SIZE = 2000; |
| 1064 char line[LINE_SIZE]; | |
| 1065 char orig[LINE_SIZE]; | |
| 1066 char *delim = " \t"; | |
| 1067 int curline = 0; | |
| 1068 while (!is.eof()) { | |
| 1069 is.getline(line, LINE_SIZE); | |
| 1070 snprintf(orig, sizeof(orig), "%s", line); | |
| 1071 curline++; | |
| 1072 int n = strlen(line); | |
| 1073 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 1074 char *cmd = strtok(line, delim); | |
| 1075 if (cmd && (cmd[0] != '#') && (cmd[0] != '\0')) { | |
| 1076 // have a decent command | |
| 1077 bool processed = false; | |
| 1078 switch (commands[cmd]) { | |
| 28 | 1079 case tld: { |
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1080 char *tld = next_token(delim); |
| 28 | 1081 if (!tld) break; // no tld value |
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1082 dc.tlds.insert(tld); |
| 28 | 1083 processed = true; |
| 1084 } break; | |
| 1085 | |
| 8 | 1086 case content: { |
| 1087 char *suff = strtok(NULL, delim); | |
| 24 | 1088 if (!suff) break; // no dns suffix |
| 8 | 1089 char *msg = suff + strlen(suff); |
| 1090 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 1091 msg = strchr(msg+1, '\''); | |
| 1092 if (!msg) break; // no reply message template | |
| 1093 msg++; // move over the leading ' | |
| 1094 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 1095 char *last = strchr(msg, '\''); | |
| 1096 if (!last) break; // no trailing quote | |
| 1097 *last = '\0'; // make it a null terminator | |
| 1098 dc.content_suffix = register_string(suff); | |
| 1099 dc.content_message = register_string(msg); | |
| 1100 processed = true; | |
| 1101 } break; | |
| 1102 | |
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1103 case hostlimit: { |
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1104 char *limit = strtok(NULL, delim); |
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1105 if (!limit) break; // no integer limit |
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1106 char *msg = limit + strlen(limit); |
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1107 if ((msg - line) >= strlen(orig)) break; // line ended with the limit |
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1108 msg = strchr(msg+1, '\''); |
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1109 if (!msg) break; // no reply message template |
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1110 msg++; // move over the leading ' |
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1111 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote |
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1112 char *last = strchr(msg, '\''); |
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1113 if (!last) break; // no trailing quote |
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1114 *last = '\0'; // make it a null terminator |
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1115 dc.host_limit = atoi(limit); |
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1116 dc.host_limit_message = register_string(msg); |
| 46 | 1117 dc.host_random = false; |
|
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1118 processed = true; |
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1119 } break; |
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1120 |
| 46 | 1121 case hostslimit: { |
| 1122 char *limit = next_token(delim); | |
| 1123 if (!limit) break; // no integer limit | |
| 1124 dc.host_limit = atoi(limit); | |
| 44 | 1125 dc.host_random = true; |
| 1126 processed = true; | |
| 1127 } break; | |
| 1128 | |
| 24 | 1129 case htmllimit: { |
| 1130 char *limit = strtok(NULL, delim); | |
| 1131 if (!limit) break; // no integer limit | |
| 1132 char *msg = limit + strlen(limit); | |
| 1133 if ((msg - line) >= strlen(orig)) break; // line ended with the limit | |
| 1134 msg = strchr(msg+1, '\''); | |
| 1135 if (!msg) break; // no reply message template | |
| 1136 msg++; // move over the leading ' | |
| 1137 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 1138 char *last = strchr(msg, '\''); | |
| 1139 if (!last) break; // no trailing quote | |
| 1140 *last = '\0'; // make it a null terminator | |
|
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1141 dc.tag_limit = atoi(limit); |
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1142 dc.tag_limit_message = register_string(msg); |
| 24 | 1143 processed = true; |
| 1144 } break; | |
| 1145 | |
| 1146 case htmltag: { | |
| 1147 char *tag = next_token(delim); | |
| 1148 if (!tag) break; // no html tag value | |
|
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1149 dc.html_tags.insert(tag); // base version |
| 26 | 1150 char buf[200]; |
| 1151 snprintf(buf, sizeof(buf), "/%s", tag); | |
|
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1152 dc.html_tags.insert(register_string(buf)); // leading / |
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1153 snprintf(buf, sizeof(buf), "%s/", tag); |
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1154 dc.html_tags.insert(register_string(buf)); // trailing / |
| 24 | 1155 processed = true; |
| 1156 } break; | |
| 1157 | |
| 0 | 1158 case dnsbl: { |
| 1159 // have a new dnsbl to use | |
| 1160 char *name = next_token(delim); | |
| 1161 if (!name) break; // no name name | |
| 1162 if (find_dnsbl(dc, name)) break; // duplicate entry | |
| 1163 char *suff = strtok(NULL, delim); | |
| 1164 if (!suff) break; // no dns suffic | |
| 1165 char *msg = suff + strlen(suff); | |
| 1166 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 1167 msg = strchr(msg+1, '\''); | |
| 1168 if (!msg) break; // no reply message template | |
| 1169 msg++; // move over the leading ' | |
| 1170 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 1171 char *last = strchr(msg, '\''); | |
| 1172 if (!last) break; // no trailing quote | |
| 1173 *last = '\0'; // make it a null terminator | |
| 1174 dc.dnsbls[name] = new DNSBL(register_string(suff), register_string(msg)); | |
| 1175 processed = true; | |
| 1176 } break; | |
| 1177 | |
| 1178 case dnsbll: { | |
| 1179 // define a new combination of dnsbls | |
| 1180 char *name = next_token(delim); | |
| 1181 if (!name) break; | |
| 1182 if (find_dnsbll(dc, name)) break; // duplicate entry | |
| 1183 char *list = next_token(delim); | |
| 1184 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 1185 DNSBLLP d = new DNSBLL; | |
| 1186 DNSBLP p = find_dnsbl(dc, list); | |
| 1187 if (p) d->push_back(p); | |
| 1188 while (true) { | |
| 1189 list = next_token(delim); | |
| 1190 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 1191 DNSBLP p = find_dnsbl(dc, list); | |
| 1192 if (p) d->push_back(p); | |
| 1193 } | |
| 1194 dc.dnsblls[name] = d; | |
| 1195 processed = true; | |
| 1196 } break; | |
| 1197 | |
| 1198 case envfrom: { | |
| 1199 // add an entry into the named string_map | |
| 1200 char *name = next_token(delim); | |
| 1201 if (!name) break; | |
| 1202 char *from = next_token(delim); | |
| 1203 if (!from) break; | |
| 1204 char *list = next_token(delim); | |
| 1205 if (!list) break; | |
| 1206 if ((strcmp(list, WHITE) == 0) || | |
| 1207 (strcmp(list, BLACK) == 0)) { | |
| 1208 string_map &fm = really_find_from_map(dc, name); | |
| 1209 fm[from] = list; | |
| 1210 processed = true; | |
| 1211 } | |
| 1212 else { | |
| 1213 // list may be the name of a previously defined from_map | |
| 1214 string_map *m = find_from_map(dc, list); | |
| 1215 if (m && (strcmp(list,name) != 0)) { | |
| 1216 string_map &pm = *m; | |
| 1217 string_map &fm = really_find_from_map(dc, name); | |
| 1218 fm.insert(pm.begin(), pm.end()); | |
| 1219 processed = true; | |
| 1220 } | |
| 1221 } | |
| 1222 } break; | |
| 1223 | |
| 1224 case envto: { | |
| 1225 // define the dnsbl_list and env_from maps to use for this recipient | |
| 1226 char *to = next_token(delim); | |
| 1227 if (!to) break; | |
| 1228 char *list = next_token(delim); | |
| 1229 if (!list) break; | |
| 1230 char *from = next_token(delim); | |
| 1231 if (!from) break; | |
| 1232 dc.env_to_dnsbll[to] = list; | |
| 1233 dc.env_to_chkfrom[to] = from; | |
| 1234 processed = true; | |
| 1235 } break; | |
| 1236 | |
| 1237 case include: { | |
| 1238 char *fn = next_token(delim); | |
| 3 | 1239 if (ok_to_include(dc, fn)) { |
| 1240 load_conf(dc, fn); | |
| 1241 processed = true; | |
| 1242 } | |
| 1243 } break; | |
| 1244 | |
| 1245 case includedcc: { | |
| 1246 char *name = next_token(delim); | |
| 1247 if (!name) break; | |
| 1248 char *fn = next_token(delim); | |
| 1249 if (ok_to_include(dc, fn)) { | |
| 1250 load_conf_dcc(dc, name, fn); | |
| 1251 processed = true; | |
| 0 | 1252 } |
| 1253 } break; | |
| 1254 | |
| 1255 default: { | |
| 1256 } break; | |
| 1257 } | |
| 1258 if (!processed) { | |
| 1259 pthread_mutex_lock(&syslog_mutex); | |
| 1260 openlog("dnsbl", LOG_PID, LOG_MAIL); | |
| 1261 syslog(LOG_ERR, "ignoring file %s line %d : %s\n", fn, curline, orig); | |
| 1262 closelog(); | |
| 1263 pthread_mutex_unlock(&syslog_mutex); | |
| 1264 } | |
| 1265 } | |
| 1266 } | |
| 1267 is.close(); | |
| 1268 } | |
| 1269 | |
| 1270 | |
| 1271 //////////////////////////////////////////////// | |
| 1272 // reload the config | |
| 1273 // | |
| 1274 static CONFIG* new_conf(); | |
| 1275 static CONFIG* new_conf() { | |
| 1276 CONFIG *newc = new CONFIG; | |
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1277 pthread_mutex_lock(&config_mutex); |
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1278 newc->generation = generation++; |
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1279 pthread_mutex_unlock(&config_mutex); |
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1280 char buf[200]; |
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1281 snprintf(buf, sizeof(buf), "loading configuration generation %d", newc->generation); |
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1282 my_syslog(buf); |
| 0 | 1283 load_conf(*newc, "dnsbl.conf"); |
| 1284 newc->load_time = time(NULL); | |
| 1285 return newc; | |
| 1286 } | |
| 1287 | |
| 1288 | |
| 1289 //////////////////////////////////////////////// | |
| 1290 // thread to watch the old config files for changes | |
| 1291 // and reload when needed. we also cleanup old | |
| 1292 // configs whose reference count has gone to zero. | |
| 1293 // | |
| 1294 static void* config_loader(void *arg); | |
| 1295 static void* config_loader(void *arg) { | |
| 1296 typedef set<CONFIG *> configp_set; | |
| 1297 configp_set old_configs; | |
| 18 | 1298 while (loader_run) { |
| 0 | 1299 sleep(180); // look for modifications every 3 minutes |
| 18 | 1300 if (!loader_run) break; |
| 0 | 1301 CONFIG &dc = *config; |
| 1302 time_t then = dc.load_time; | |
| 1303 struct stat st; | |
| 1304 bool reload = false; | |
| 1305 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 1306 char *fn = *i; | |
| 1307 if (stat(fn, &st)) reload = true; // file disappeared | |
| 1308 else if (st.st_mtime > then) reload = true; // file modified | |
| 1309 if (reload) break; | |
| 1310 } | |
| 1311 if (reload) { | |
| 1312 CONFIG *newc = new_conf(); | |
| 1313 // replace the global config pointer | |
| 1314 pthread_mutex_lock(&config_mutex); | |
| 1315 CONFIG *old = config; | |
| 1316 config = newc; | |
| 1317 pthread_mutex_unlock(&config_mutex); | |
| 1318 if (old) old_configs.insert(old); | |
| 1319 } | |
| 1320 // now look for old configs with zero ref counts | |
| 1321 for (configp_set::iterator i=old_configs.begin(); i!=old_configs.end(); ) { | |
| 1322 CONFIG *old = *i; | |
| 1323 if (!old->reference_count) { | |
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1324 char buf[200]; |
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1325 snprintf(buf, sizeof(buf), "freeing memory for old configuration generation %d", old->generation); |
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1326 my_syslog(buf); |
| 0 | 1327 delete old; // destructor does all the work |
| 1328 old_configs.erase(i++); | |
| 1329 } | |
| 1330 else i++; | |
| 1331 } | |
| 1332 } | |
| 18 | 1333 return NULL; |
| 0 | 1334 } |
| 1335 | |
| 1336 | |
| 1337 static void usage(char *prog); | |
| 1338 static void usage(char *prog) | |
| 1339 { | |
| 16 | 1340 fprintf(stderr, "Usage: %s [-d] [-c] -p socket-addr [-t timeout]\n", prog); |
| 0 | 1341 fprintf(stderr, "where socket-addr is for the connection to sendmail and should be one of\n"); |
| 1342 fprintf(stderr, " inet:port@local-ip-address\n"); | |
| 1343 fprintf(stderr, " local:local-domain-socket-file-name\n"); | |
| 9 | 1344 fprintf(stderr, "-c will load and dump the config to stdout\n"); |
| 16 | 1345 fprintf(stderr, "-d will add some syslog debug messages\n"); |
| 0 | 1346 } |
| 1347 | |
| 1348 | |
| 42 | 1349 |
| 1350 static void setup_socket(char *sock); | |
| 1351 static void setup_socket(char *sock) { | |
| 1352 unlink(sock); | |
| 43 | 1353 // sockaddr_un addr; |
| 1354 // memset(&addr, '\0', sizeof addr); | |
| 1355 // addr.sun_family = AF_UNIX; | |
| 1356 // strncpy(addr.sun_path, sock, sizeof(addr.sun_path)-1); | |
| 1357 // int s = socket(AF_UNIX, SOCK_STREAM, 0); | |
| 1358 // bind(s, (sockaddr*)&addr, sizeof(addr)); | |
| 1359 // close(s); | |
| 42 | 1360 } |
| 1361 | |
| 1362 | |
| 0 | 1363 int main(int argc, char**argv) |
| 1364 { | |
| 3 | 1365 bool check = false; |
| 1366 bool setconn = false; | |
| 0 | 1367 int c; |
| 16 | 1368 const char *args = "p:t:hcd"; |
| 0 | 1369 extern char *optarg; |
| 1370 | |
| 1371 // Process command line options | |
| 1372 while ((c = getopt(argc, argv, args)) != -1) { | |
| 1373 switch (c) { | |
| 1374 case 'p': | |
| 1375 if (optarg == NULL || *optarg == '\0') { | |
| 1376 fprintf(stderr, "Illegal conn: %s\n", optarg); | |
| 1377 exit(EX_USAGE); | |
| 1378 } | |
| 1379 if (smfi_setconn(optarg) == MI_FAILURE) { | |
| 1380 fprintf(stderr, "smfi_setconn failed\n"); | |
| 1381 exit(EX_SOFTWARE); | |
| 1382 } | |
| 1383 | |
| 42 | 1384 if (strncasecmp(optarg, "unix:", 5) == 0) setup_socket(optarg + 5); |
| 1385 else if (strncasecmp(optarg, "local:", 6) == 0) setup_socket(optarg + 6); | |
| 3 | 1386 setconn = true; |
| 0 | 1387 break; |
| 1388 | |
| 1389 case 't': | |
| 1390 if (optarg == NULL || *optarg == '\0') { | |
| 1391 fprintf(stderr, "Illegal timeout: %s\n", optarg); | |
| 1392 exit(EX_USAGE); | |
| 1393 } | |
| 1394 if (smfi_settimeout(atoi(optarg)) == MI_FAILURE) { | |
| 1395 fprintf(stderr, "smfi_settimeout failed\n"); | |
| 1396 exit(EX_SOFTWARE); | |
| 1397 } | |
| 1398 break; | |
| 1399 | |
| 3 | 1400 case 'c': |
| 1401 check = true; | |
| 1402 break; | |
| 1403 | |
| 16 | 1404 case 'd': |
| 1405 debug_syslog = true; | |
| 1406 break; | |
| 1407 | |
| 0 | 1408 case 'h': |
| 1409 default: | |
| 1410 usage(argv[0]); | |
| 1411 exit(EX_USAGE); | |
| 1412 } | |
| 1413 } | |
| 5 | 1414 |
| 1415 if (check) { | |
| 1416 CONFIG &dc = *new_conf(); | |
| 1417 dumpit(dc); | |
| 1418 return 0; | |
| 1419 } | |
| 1420 | |
| 0 | 1421 if (!setconn) { |
| 1422 fprintf(stderr, "%s: Missing required -p argument\n", argv[0]); | |
| 1423 usage(argv[0]); | |
| 1424 exit(EX_USAGE); | |
| 1425 } | |
| 5 | 1426 |
| 0 | 1427 if (smfi_register(smfilter) == MI_FAILURE) { |
| 1428 fprintf(stderr, "smfi_register failed\n"); | |
| 1429 exit(EX_UNAVAILABLE); | |
| 1430 } | |
| 1431 | |
| 1432 // switch to background mode | |
| 1433 if (daemon(1,0) < 0) { | |
| 1434 fprintf(stderr, "daemon() call failed\n"); | |
| 1435 exit(EX_UNAVAILABLE); | |
| 1436 } | |
| 1437 | |
| 1438 // write the pid | |
| 1439 const char *pidpath = "/var/run/dnsbl.pid"; | |
| 1440 unlink(pidpath); | |
| 1441 FILE *f = fopen(pidpath, "w"); | |
| 1442 if (f) { | |
| 22 | 1443 #ifdef linux |
| 1444 // from a comment in the DCC source code: | |
| 1445 // Linux threads are broken. Signals given the | |
| 1446 // original process are delivered to only the | |
| 1447 // thread that happens to have that PID. The | |
| 1448 // sendmail libmilter thread that needs to hear | |
| 1449 // SIGINT and other signals does not, and that breaks | |
| 1450 // scripts that need to stop milters. | |
| 1451 // However, signaling the process group works. | |
| 0 | 1452 fprintf(f, "-%d\n", (u_int)getpgrp()); |
| 22 | 1453 #else |
| 1454 fprintf(f, "%d\n", (u_int)getpid()); | |
| 1455 #endif | |
| 0 | 1456 fclose(f); |
| 1457 } | |
| 1458 | |
| 42 | 1459 // drop root privs |
| 1460 struct passwd *pw = getpwnam("dnsbl"); | |
| 1461 if (pw) { | |
| 48 | 1462 if (setgid(pw->pw_gid) == -1) { |
| 1463 my_syslog("failed to switch to group dnsbl"); | |
| 1464 } | |
| 42 | 1465 if (setuid(pw->pw_uid) == -1) { |
| 1466 my_syslog("failed to switch to user dnsbl"); | |
| 1467 } | |
| 1468 } | |
| 1469 | |
| 48 | 1470 // initialize the thread sync objects |
| 1471 pthread_mutex_init(&config_mutex, 0); | |
| 1472 pthread_mutex_init(&syslog_mutex, 0); | |
| 1473 pthread_mutex_init(&resolve_mutex, 0); | |
| 1474 | |
| 1475 // load the initial config | |
| 1476 config = new_conf(); | |
| 1477 | |
| 1478 // only create threads after the fork() in daemon | |
| 1479 pthread_t tid; | |
| 1480 if (pthread_create(&tid, 0, config_loader, 0)) | |
| 1481 my_syslog("failed to create config loader thread"); | |
| 1482 if (pthread_detach(tid)) | |
| 1483 my_syslog("failed to detach config loader thread"); | |
| 1484 | |
| 18 | 1485 time_t starting = time(NULL); |
| 1486 int rc = smfi_main(); | |
| 22 | 1487 if ((rc != MI_SUCCESS) && (time(NULL) > starting+5*60)) { |
| 18 | 1488 my_syslog("trying to restart after smfi_main()"); |
| 1489 loader_run = false; // eventually the config loader thread will terminate | |
| 1490 execvp(argv[0], argv); | |
| 1491 } | |
| 1492 exit((rc == MI_SUCCESS) ? 0 : EX_UNAVAILABLE); | |
| 0 | 1493 } |
| 8 | 1494 |