| 1 | #include "sig.h" |
| 2 | #include "readwrite.h" |
| 3 | #include "getln.h" |
| 4 | #include "stralloc.h" |
| 5 | #include "substdio.h" |
| 6 | #include "alloc.h" |
| 7 | #include "auto_qmail.h" |
| 8 | #include "control.h" |
| 9 | #include "received.h" |
| 10 | #include "constmap.h" |
| 11 | #include "error.h" |
| 12 | #include "ipme.h" |
| 13 | #include "ip.h" |
| 14 | #include "qmail.h" |
| 15 | #include "str.h" |
| 16 | #include "fmt.h" |
| 17 | #include "byte.h" |
| 18 | #include "case.h" |
| 19 | #include "env.h" |
| 20 | #include "now.h" |
| 21 | #include "exit.h" |
| 22 | |
| 23 | #define MAXHOPS 100 |
| 24 | int timeout = 1200; |
| 25 | |
| 26 | char ssoutbuf[512]; |
| 27 | substdio ssout = SUBSTDIO_FDBUF(write,1,ssoutbuf,sizeof(ssoutbuf)); |
| 28 | |
| 29 | void die() { substdio_flush(&ssout); _exit(1); } |
| 30 | void flush() { if (substdio_flush(&ssout) == -1) _exit(1); } |
| 31 | void out(s) char *s; { if (substdio_puts(&ssout,s) == -1) die(); } |
| 32 | |
| 33 | int timeoutread(fd,buf,n) int fd; char *buf; int n; |
| 34 | { |
| 35 | int r; int saveerrno; |
| 36 | flush(); |
| 37 | alarm(timeout); |
| 38 | r = read(fd,buf,n); saveerrno = errno; |
| 39 | alarm(0); |
| 40 | errno = saveerrno; return r; |
| 41 | } |
| 42 | |
| 43 | char ssinbuf[1024]; |
| 44 | substdio ssin = SUBSTDIO_FDBUF(timeoutread,0,ssinbuf,sizeof(ssinbuf)); |
| 45 | |
| 46 | |
| 47 | void outofmem() { out("421 out of memory (#4.3.0)\r\n"); die(); } |
| 48 | void sigalrm() { out("451 timeout (#4.4.2)\r\n"); die(); } |
| 49 | |
| 50 | struct qmail qqt; |
| 51 | stralloc greeting = {0}; |
| 52 | int liphostok = 0; |
| 53 | stralloc liphost = {0}; |
| 54 | int rhok = 0; |
| 55 | stralloc rcpthosts = {0}; |
| 56 | struct constmap maprcpthosts; |
| 57 | int bmfok = 0; |
| 58 | stralloc bmf = {0}; |
| 59 | int relayhostsok = 0; |
| 60 | stralloc relayhosts = {0}; |
| 61 | struct constmap maprelayhosts; |
| 62 | struct constmap mapbmf; |
| 63 | int flagbarf; /* defined if seenmail */ |
| 64 | |
| 65 | stralloc helohost = {0}; |
| 66 | stralloc mailfrom = {0}; |
| 67 | stralloc rcptto = {0}; |
| 68 | int seenmail = 0; |
| 69 | |
| 70 | stralloc addr = {0}; /* will be 0-terminated, if addrparse returns 1 */ |
| 71 | |
| 72 | char *remoteip; |
| 73 | char *remotehost; |
| 74 | char *remoteinfo; |
| 75 | char *local; |
| 76 | char *relayclient; |
| 77 | |
| 78 | void dohelo(arg) char *arg; |
| 79 | { |
| 80 | if (!stralloc_copys(&helohost,arg)) outofmem(); |
| 81 | if (!stralloc_0(&helohost)) outofmem(); |
| 82 | } |
| 83 | |
| 84 | void getenvs() |
| 85 | { |
| 86 | remoteip = env_get("TCPREMOTEIP"); |
| 87 | if (!remoteip) remoteip = "unknown"; |
| 88 | local = env_get("TCPLOCALHOST"); |
| 89 | if (!local) local = env_get("TCPLOCALIP"); |
| 90 | if (!local) local = "unknown"; |
| 91 | remotehost = env_get("TCPREMOTEHOST"); |
| 92 | if (!remotehost) remotehost = "unknown"; |
| 93 | remoteinfo = env_get("TCPREMOTEINFO"); |
| 94 | relayclient = env_get("RELAYCLIENT"); |
| 95 | if (!relayclient && relayhostsok) { |
| 96 | int j; |
| 97 | int l = str_len(remotehost); |
| 98 | relayclient = constmap(&maprelayhosts, remotehost, l); |
| 99 | if (!relayclient) for (j = 0; j < l; ++j) { |
| 100 | if (remotehost[j] == '.' && |
| 101 | (relayclient = constmap(&maprelayhosts, |
| 102 | remotehost + j, |
| 103 | l - j)) != 0) |
| 104 | break; |
| 105 | } |
| 106 | } |
| 107 | dohelo(remotehost); |
| 108 | } |
| 109 | |
| 110 | void straynewline() |
| 111 | { |
| 112 | out("451 \ |
| 113 | Put ,E=\\r\\n at the end of Mether, Mtcp, or Msmtp in sendmail.cf \ |
| 114 | if you are using Solaris 2.5 (fixed in 2.5.1). \ |
| 115 | I cannot accept messages with stray newlines. \ |
| 116 | Many SMTP servers will time out waiting for \\r\\n.\\r\\n.\ |
| 117 | \r\n"); |
| 118 | die(); |
| 119 | } |
| 120 | |
| 121 | void blast(ssfrom,hops) |
| 122 | substdio *ssfrom; |
| 123 | int *hops; |
| 124 | { |
| 125 | char ch; |
| 126 | int state; |
| 127 | int flaginheader; |
| 128 | int pos; /* number of bytes since most recent \n, if fih */ |
| 129 | int flagmaybex; /* 1 if this line might match RECEIVED, if fih */ |
| 130 | int flagmaybey; /* 1 if this line might match \r\n, if fih */ |
| 131 | int flagmaybez; /* 1 if this line might match DELIVERED, if fih */ |
| 132 | |
| 133 | state = 1; |
| 134 | *hops = 0; |
| 135 | flaginheader = 1; |
| 136 | pos = 0; flagmaybex = flagmaybey = flagmaybez = 1; |
| 137 | for (;;) |
| 138 | { |
| 139 | if (substdio_get(ssfrom,&ch,1) <= 0) die(); |
| 140 | if (flaginheader) |
| 141 | { |
| 142 | if (pos < 9) |
| 143 | { |
| 144 | if (ch != "delivered"[pos]) if (ch != "DELIVERED"[pos]) flagmaybez = 0; |
| 145 | if (flagmaybez) if (pos == 8) ++*hops; |
| 146 | if (pos < 8) |
| 147 | if (ch != "received"[pos]) if (ch != "RECEIVED"[pos]) flagmaybex = 0; |
| 148 | if (flagmaybex) if (pos == 7) ++*hops; |
| 149 | if (pos < 2) if (ch != "\r\n"[pos]) flagmaybey = 0; |
| 150 | if (flagmaybey) if (pos == 1) flaginheader = 0; |
| 151 | } |
| 152 | ++pos; |
| 153 | if (ch == '\n') { pos = 0; flagmaybex = flagmaybey = flagmaybez = 1; } |
| 154 | } |
| 155 | switch(state) |
| 156 | { |
| 157 | case 0: |
| 158 | if (ch == '\n') straynewline(); |
| 159 | if (ch == '\r') { state = 4; continue; } |
| 160 | break; |
| 161 | case 1: /* \r\n */ |
| 162 | if (ch == '\n') straynewline(); |
| 163 | if (ch == '.') { state = 2; continue; } |
| 164 | if (ch == '\r') { state = 4; continue; } |
| 165 | state = 0; |
| 166 | break; |
| 167 | case 2: /* \r\n + . */ |
| 168 | if (ch == '\n') straynewline(); |
| 169 | if (ch == '\r') { state = 3; continue; } |
| 170 | state = 0; |
| 171 | break; |
| 172 | case 3: /* \r\n + .\r */ |
| 173 | if (ch == '\n') return; |
| 174 | qmail_put(&qqt,".\r",2); |
| 175 | if (ch == '\r') { state = 4; continue; } |
| 176 | state = 0; |
| 177 | break; |
| 178 | case 4: /* + \r */ |
| 179 | if (ch == '\n') { state = 1; break; } |
| 180 | if (ch != '\r') { qmail_put(&qqt,"\r",1); state = 0; } |
| 181 | } |
| 182 | qmail_put(&qqt,&ch,1); |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | int addrparse(arg) |
| 187 | char *arg; |
| 188 | { |
| 189 | int i; |
| 190 | char ch; |
| 191 | struct ip_address ip; |
| 192 | int flagesc; |
| 193 | int flagquoted; |
| 194 | |
| 195 | arg += str_chr(arg,'<'); |
| 196 | if (*arg != '<') return 0; |
| 197 | ++arg; |
| 198 | |
| 199 | /* strip source route */ |
| 200 | if (*arg == '@') while (*arg) if (*arg++ == ':') break; |
| 201 | |
| 202 | if (!*arg) return 0; |
| 203 | if (!stralloc_copys(&addr,"")) outofmem(); |
| 204 | flagesc = 0; |
| 205 | flagquoted = 0; |
| 206 | for (i = 0;ch = arg[i];++i) /* copy arg to addr, stripping quotes */ |
| 207 | { |
| 208 | if (flagesc) |
| 209 | { if (!stralloc_append(&addr,&ch)) outofmem(); flagesc = 0; } |
| 210 | else |
| 211 | { |
| 212 | if (!flagquoted && (ch == '>')) break; |
| 213 | switch(ch) |
| 214 | { |
| 215 | case '\\': flagesc = 1; break; |
| 216 | case '"': flagquoted = !flagquoted; break; |
| 217 | default: if (!stralloc_append(&addr,&ch)) outofmem(); |
| 218 | } |
| 219 | } |
| 220 | } |
| 221 | if (!ch) return 0; |
| 222 | if (!stralloc_append(&addr,"")) outofmem(); |
| 223 | ++i; |
| 224 | while (arg[i]) |
| 225 | { |
| 226 | if (!case_diffs(arg + i," BODY=8BITMIME")) i += 14; |
| 227 | else if (!case_diffs(arg + i," BODY=7BIT")) i += 10; |
| 228 | else return 0; |
| 229 | } |
| 230 | |
| 231 | if (liphostok) |
| 232 | { |
| 233 | i = byte_rchr(addr.s,addr.len,'@'); |
| 234 | if (i < addr.len) /* if not, partner should go read rfc 821 */ |
| 235 | if (addr.s[i + 1] == '[') |
| 236 | if (!addr.s[i + 1 + ip_scanbracket(addr.s + i + 1,&ip)]) |
| 237 | if (ipme_is(&ip)) |
| 238 | { |
| 239 | addr.len = i + 1; |
| 240 | if (!stralloc_cat(&addr,&liphost)) outofmem(); |
| 241 | if (!stralloc_0(&addr)) outofmem(); |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | return 1; |
| 246 | } |
| 247 | |
| 248 | int addrallowed() |
| 249 | { |
| 250 | int j; |
| 251 | if (!rhok) return 1; |
| 252 | j = byte_rchr(addr.s,addr.len,'@'); |
| 253 | if (j >= addr.len) return 1; /* can be taken care of by envnoathost */ |
| 254 | if (constmap(&maprcpthosts,addr.s + j + 1,addr.len - j - 2)) return 1; |
| 255 | for (;j < addr.len;++j) |
| 256 | if (addr.s[j] == '.') |
| 257 | if (constmap(&maprcpthosts,addr.s + j,addr.len - j - 1)) return 1; |
| 258 | return 0; |
| 259 | } |
| 260 | |
| 261 | void bmfcheck() |
| 262 | { |
| 263 | int j; |
| 264 | flagbarf = 0; |
| 265 | if (!bmfok) return; |
| 266 | if (constmap(&mapbmf,addr.s,addr.len - 1)) { flagbarf = 1; return; } |
| 267 | j = byte_rchr(addr.s,addr.len,'@'); |
| 268 | if (j < addr.len) |
| 269 | if (constmap(&mapbmf,addr.s + j,addr.len - j - 1)) flagbarf = 1; |
| 270 | } |
| 271 | |
| 272 | void smtp_greet(code) char *code; { |
| 273 | if (substdio_puts(&ssout,code) == -1) die(); |
| 274 | if (substdio_put(&ssout,greeting.s,greeting.len) == -1) die(); } |
| 275 | void smtp_quit() { smtp_greet("221 "); out("\r\n"); die(); } |
| 276 | void smtp_help() { out("214-qmail home page: http://pobox.com/~djb/qmail.html\r\n214 send comments to qmail@pobox.com\r\n"); } |
| 277 | void err_syntax() { out("555 syntax error (#5.5.4)\r\n"); } |
| 278 | void err_bmf() { out("553 sorry, your envelope sender is in my badmailfrom list (#5.7.1)\r\n"); } |
| 279 | void err_nogateway() { out("553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)\r\n"); } |
| 280 | void err_unimpl() { out("502 unimplemented (#5.5.1)\r\n"); } |
| 281 | void err_seenmail() { out("503 one MAIL per message (#5.5.1)\r\n"); } |
| 282 | void err_wantmail() { out("503 MAIL first (#5.5.1)\r\n"); } |
| 283 | void err_wantrcpt() { out("503 RCPT first (#5.5.1)\r\n"); } |
| 284 | void err_noop() { out("250 ok\r\n"); } |
| 285 | void err_vrfy() { out("252 send some mail, i'll try my best\r\n"); } |
| 286 | void err_qqt() { out("451 qqt failure (#4.3.0)\r\n"); } |
| 287 | void smtp_helo(arg) char *arg; { |
| 288 | smtp_greet("250-"); out("\r\n250-PIPELINING\r\n250 8BITMIME\r\n"); |
| 289 | seenmail = 0; |
| 290 | dohelo(arg ? arg : ""); } |
| 291 | void smtp_rset() { |
| 292 | seenmail = 0; |
| 293 | out("250 flushed\r\n"); } |
| 294 | void smtp_mail(arg) char *arg; { |
| 295 | if (seenmail) { err_seenmail(); return; } |
| 296 | if (!arg) { err_syntax(); return; } |
| 297 | if (!addrparse(arg)) { err_syntax(); return; } |
| 298 | bmfcheck(); |
| 299 | seenmail = 1; out("250 ok\r\n"); |
| 300 | if (!stralloc_copys(&rcptto,"")) outofmem(); |
| 301 | if (!stralloc_copys(&mailfrom,addr.s)) outofmem(); |
| 302 | if (!stralloc_0(&mailfrom)) outofmem(); } |
| 303 | void smtp_rcpt(arg) char *arg; { |
| 304 | if (!seenmail) { err_wantmail(); return; } |
| 305 | if (!arg) { err_syntax(); return; } |
| 306 | if (!addrparse(arg)) { err_syntax(); return; } |
| 307 | if (flagbarf) { err_bmf(); return; } |
| 308 | if (relayclient) |
| 309 | { |
| 310 | --addr.len; |
| 311 | if (!stralloc_cats(&addr,relayclient)) outofmem(); |
| 312 | if (!stralloc_0(&addr)) outofmem(); |
| 313 | } |
| 314 | else |
| 315 | if (!addrallowed()) { err_nogateway(); return; } |
| 316 | out("250 ok\r\n"); |
| 317 | if (!stralloc_cats(&rcptto,"T")) outofmem(); |
| 318 | if (!stralloc_cats(&rcptto,addr.s)) outofmem(); |
| 319 | if (!stralloc_0(&rcptto)) outofmem(); } |
| 320 | |
| 321 | char accept_buf[FMT_ULONG]; |
| 322 | void acceptmessage(qp) unsigned long qp; |
| 323 | { |
| 324 | datetime_sec when; |
| 325 | when = now(); |
| 326 | out("250 ok "); |
| 327 | accept_buf[fmt_ulong(accept_buf,(unsigned long) when)] = 0; |
| 328 | out(accept_buf); |
| 329 | out(" qp "); |
| 330 | accept_buf[fmt_ulong(accept_buf,qp)] = 0; |
| 331 | out(accept_buf); |
| 332 | out("\r\n"); |
| 333 | } |
| 334 | |
| 335 | void smtp_data() { |
| 336 | int hops; int r; unsigned long qp; |
| 337 | if (!seenmail) { err_wantmail(); return; } |
| 338 | if (!rcptto.len) { err_wantrcpt(); return; } |
| 339 | seenmail = 0; |
| 340 | if (qmail_open(&qqt) == -1) { err_qqt(); return; } |
| 341 | qp = qmail_qp(&qqt); |
| 342 | out("354 go ahead\r\n"); |
| 343 | |
| 344 | received(&qqt,"SMTP",local,remoteip,remotehost,remoteinfo,case_diffs(remotehost,helohost.s) ? helohost.s : 0); |
| 345 | blast(&ssin,&hops); |
| 346 | hops = (hops >= MAXHOPS); |
| 347 | if (hops) qmail_fail(&qqt); |
| 348 | qmail_from(&qqt,mailfrom.s); |
| 349 | qmail_put(&qqt,rcptto.s,rcptto.len); |
| 350 | |
| 351 | r = qmail_close(&qqt); |
| 352 | if (!r) { acceptmessage(qp); return; } |
| 353 | if (hops) { out("554 too many hops, this message is looping (#5.4.6)\r\n"); return; } |
| 354 | switch(r) |
| 355 | { |
| 356 | case QMAIL_TOOLONG: out("554 address too long (#5.1.3)\r\n"); return; |
| 357 | case QMAIL_SYS: out("451 qq system error (#4.3.0)\r\n"); return; |
| 358 | case QMAIL_READ: out("451 qq read error (#4.3.0)\r\n"); return; |
| 359 | case QMAIL_WRITE: out("451 qq write error or disk full (#4.3.0)\r\n"); return; |
| 360 | case QMAIL_NOMEM: out("451 qq out of memory (#4.3.0)\r\n"); return; |
| 361 | case QMAIL_EXECSOFT: out("451 could not exec qq (#4.3.0)\r\n"); return; |
| 362 | case QMAIL_TIMEOUT: out("451 qq timeout (#4.3.0)\r\n"); return; |
| 363 | case QMAIL_WAITPID: out("451 qq waitpid surprise (#4.3.0)\r\n"); return; |
| 364 | case QMAIL_CRASHED: out("451 qq crashed (#4.3.0)\r\n"); return; |
| 365 | case QMAIL_USAGE: out("451 qq usage surprise (#4.3.0)\r\n"); return; |
| 366 | default: out("451 qq internal bug (#4.3.0)\r\n"); return; |
| 367 | } |
| 368 | } |
| 369 | |
| 370 | static struct { void (*fun)(); char *text; int flagflush; } smtpcmd[] = { |
| 371 | { smtp_rcpt, "rcpt", 0 } |
| 372 | , { smtp_mail, "mail", 0 } |
| 373 | , { smtp_data, "data", 1 } |
| 374 | , { smtp_quit, "quit", 1 } |
| 375 | , { smtp_helo, "helo", 1 } |
| 376 | , { smtp_helo, "ehlo", 1 } |
| 377 | , { smtp_rset, "rset", 0 } |
| 378 | , { smtp_help, "help", 1 } |
| 379 | , { err_noop, "noop", 1 } |
| 380 | , { err_vrfy, "vrfy", 1 } |
| 381 | , { 0, 0, 0 } |
| 382 | }; |
| 383 | |
| 384 | void doit(cmd) |
| 385 | char *cmd; |
| 386 | { |
| 387 | int i; |
| 388 | int j; |
| 389 | char ch; |
| 390 | |
| 391 | for (i = 0;smtpcmd[i].fun;++i) |
| 392 | { |
| 393 | for (j = 0;ch = smtpcmd[i].text[j];++j) |
| 394 | if ((cmd[j] != ch) && (cmd[j] != ch - 32)) |
| 395 | break; |
| 396 | if (!ch) |
| 397 | if (!cmd[j] || (cmd[j] == ' ')) |
| 398 | { |
| 399 | while (cmd[j] == ' ') ++j; |
| 400 | if (!cmd[j]) |
| 401 | smtpcmd[i].fun((char *) 0); |
| 402 | else |
| 403 | smtpcmd[i].fun(cmd + j); |
| 404 | if (smtpcmd[i].flagflush) flush(); |
| 405 | return; |
| 406 | } |
| 407 | } |
| 408 | err_unimpl(); |
| 409 | flush(); |
| 410 | } |
| 411 | |
| 412 | void getcontrols() |
| 413 | { |
| 414 | if (control_init() == -1) die(); |
| 415 | if (control_rldef(&greeting,"control/smtpgreeting",1,(char *) 0) != 1) die(); |
| 416 | switch(control_rldef(&liphost,"control/localiphost",1,(char *) 0)) |
| 417 | { case -1: die(); case 1: liphostok = 1; } |
| 418 | if (control_readint(&timeout,"control/timeoutsmtpd") == -1) die(); |
| 419 | if (timeout <= 0) timeout = 1; |
| 420 | switch(control_readfile(&rcpthosts,"control/rcpthosts",0)) |
| 421 | { |
| 422 | case -1: die(); |
| 423 | case 1: |
| 424 | rhok = 1; |
| 425 | if (!constmap_init(&maprcpthosts,rcpthosts.s,rcpthosts.len,0)) die(); |
| 426 | } |
| 427 | switch(control_readfile(&bmf,"control/badmailfrom",0)) |
| 428 | { |
| 429 | case -1: die(); |
| 430 | case 1: |
| 431 | bmfok = 1; |
| 432 | if (!constmap_init(&mapbmf,bmf.s,bmf.len,0)) die(); |
| 433 | } |
| 434 | switch (control_readfile(&relayhosts, "control/relayhosts", 0)) { |
| 435 | case -1: |
| 436 | die(); |
| 437 | case 1: |
| 438 | relayhostsok = 1; |
| 439 | if (!constmap_init(&maprelayhosts, relayhosts.s, relayhosts.len, 1)) |
| 440 | die(); |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | void main() |
| 445 | { |
| 446 | static stralloc cmd = {0}; |
| 447 | int match; |
| 448 | |
| 449 | sig_alarmcatch(sigalrm); |
| 450 | sig_pipeignore(); |
| 451 | |
| 452 | if (chdir(auto_qmail) == -1) die(); |
| 453 | getcontrols(); |
| 454 | getenvs(); |
| 455 | |
| 456 | if (ipme_init() != 1) die(); |
| 457 | |
| 458 | smtp_greet("220 "); |
| 459 | out(" ESMTP\r\n"); |
| 460 | |
| 461 | for (;;) |
| 462 | { |
| 463 | /* XXX: recipient can contain quoted lf. aargh. */ |
| 464 | if (getln(&ssin,&cmd,&match,'\n') == -1) die(); |
| 465 | if (!match) die(); |
| 466 | if (cmd.len == 0) die(); |
| 467 | if (cmd.s[--cmd.len] != '\n') die(); |
| 468 | if ((cmd.len > 0) && (cmd.s[cmd.len - 1] == '\r')) --cmd.len; |
| 469 | cmd.s[cmd.len++] = 0; |
| 470 | doit(cmd.s); |
| 471 | } |
| 472 | } |