Commit | Line | Data |
---|---|---|
2117e02e MW |
1 | #include "sig.h" |
2 | #include "readwrite.h" | |
2117e02e MW |
3 | #include "stralloc.h" |
4 | #include "substdio.h" | |
5 | #include "alloc.h" | |
6 | #include "auto_qmail.h" | |
7 | #include "control.h" | |
8 | #include "received.h" | |
9 | #include "constmap.h" | |
10 | #include "error.h" | |
11 | #include "ipme.h" | |
12 | #include "ip.h" | |
13 | #include "qmail.h" | |
14 | #include "str.h" | |
15 | #include "fmt.h" | |
212b6f5d | 16 | #include "scan.h" |
2117e02e MW |
17 | #include "byte.h" |
18 | #include "case.h" | |
19 | #include "env.h" | |
20 | #include "now.h" | |
21 | #include "exit.h" | |
212b6f5d MW |
22 | #include "rcpthosts.h" |
23 | #include "timeoutread.h" | |
24 | #include "timeoutwrite.h" | |
25 | #include "commands.h" | |
2117e02e MW |
26 | |
27 | #define MAXHOPS 100 | |
212b6f5d | 28 | unsigned int databytes = 0; |
2117e02e MW |
29 | int timeout = 1200; |
30 | ||
212b6f5d | 31 | int safewrite(fd,buf,len) int fd; char *buf; int len; |
2117e02e | 32 | { |
212b6f5d MW |
33 | int r; |
34 | r = timeoutwrite(timeout,fd,buf,len); | |
35 | if (r <= 0) _exit(1); | |
36 | return r; | |
2117e02e MW |
37 | } |
38 | ||
212b6f5d MW |
39 | char ssoutbuf[512]; |
40 | substdio ssout = SUBSTDIO_FDBUF(safewrite,1,ssoutbuf,sizeof ssoutbuf); | |
2117e02e | 41 | |
212b6f5d MW |
42 | void flush() { substdio_flush(&ssout); } |
43 | void out(s) char *s; { substdio_puts(&ssout,s); } | |
2117e02e | 44 | |
212b6f5d MW |
45 | void die_read() { _exit(1); } |
46 | void die_alarm() { out("451 timeout (#4.4.2)\r\n"); flush(); _exit(1); } | |
47 | void die_nomem() { out("421 out of memory (#4.3.0)\r\n"); flush(); _exit(1); } | |
48 | void die_control() { out("421 unable to read controls (#4.3.0)\r\n"); flush(); _exit(1); } | |
49 | void die_ipme() { out("421 unable to figure out my IP addresses (#4.3.0)\r\n"); flush(); _exit(1); } | |
50 | void straynewline() { out("451 See http://pobox.com/~djb/docs/smtplf.html.\r\n"); flush(); _exit(1); } | |
2117e02e | 51 | |
212b6f5d MW |
52 | void err_bmf() { out("553 sorry, your envelope sender is in my badmailfrom list (#5.7.1)\r\n"); } |
53 | void err_nogateway() { out("553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)\r\n"); } | |
54 | void err_unimpl() { out("502 unimplemented (#5.5.1)\r\n"); } | |
55 | void err_syntax() { out("555 syntax error (#5.5.4)\r\n"); } | |
56 | void err_wantmail() { out("503 MAIL first (#5.5.1)\r\n"); } | |
57 | void err_wantrcpt() { out("503 RCPT first (#5.5.1)\r\n"); } | |
58 | void err_noop() { out("250 ok\r\n"); } | |
59 | void err_vrfy() { out("252 send some mail, i'll try my best\r\n"); } | |
60 | void err_qqt() { out("451 qqt failure (#4.3.0)\r\n"); } | |
2117e02e | 61 | |
2117e02e | 62 | |
212b6f5d MW |
63 | stralloc greeting = {0}; |
64 | ||
65 | void smtp_greet(code) char *code; | |
66 | { | |
67 | substdio_puts(&ssout,code); | |
68 | substdio_put(&ssout,greeting.s,greeting.len); | |
69 | } | |
70 | void smtp_help() | |
71 | { | |
72 | out("214 qmail home page: http://pobox.com/~djb/qmail.html\r\n"); | |
73 | } | |
74 | void smtp_quit() | |
75 | { | |
76 | smtp_greet("221 "); out("\r\n"); flush(); _exit(0); | |
77 | } | |
2117e02e MW |
78 | |
79 | char *remoteip; | |
80 | char *remotehost; | |
81 | char *remoteinfo; | |
82 | char *local; | |
83 | char *relayclient; | |
84 | ||
212b6f5d MW |
85 | stralloc helohost = {0}; |
86 | char *fakehelo; /* pointer into helohost, or 0 */ | |
2117e02e | 87 | |
212b6f5d MW |
88 | void dohelo(arg) char *arg; { |
89 | if (!stralloc_copys(&helohost,arg)) die_nomem(); | |
90 | if (!stralloc_0(&helohost)) die_nomem(); | |
91 | fakehelo = case_diffs(remotehost,helohost.s) ? helohost.s : 0; | |
2117e02e MW |
92 | } |
93 | ||
212b6f5d MW |
94 | int liphostok = 0; |
95 | stralloc liphost = {0}; | |
9f4f7869 MW |
96 | int relayhostsok = 0; |
97 | stralloc relayhosts = {0}; | |
98 | struct constmap maprelayhosts; | |
212b6f5d MW |
99 | int bmfok = 0; |
100 | stralloc bmf = {0}; | |
101 | struct constmap mapbmf; | |
2117e02e | 102 | |
212b6f5d | 103 | void setup() |
2117e02e | 104 | { |
212b6f5d MW |
105 | char *x; |
106 | unsigned long u; | |
107 | ||
108 | if (control_init() == -1) die_control(); | |
109 | if (control_rldef(&greeting,"control/smtpgreeting",1,(char *) 0) != 1) | |
110 | die_control(); | |
111 | liphostok = control_rldef(&liphost,"control/localiphost",1,(char *) 0); | |
112 | if (liphostok == -1) die_control(); | |
113 | if (control_readint(&timeout,"control/timeoutsmtpd") == -1) die_control(); | |
114 | if (timeout <= 0) timeout = 1; | |
115 | ||
116 | if (rcpthosts_init() == -1) die_control(); | |
117 | ||
118 | bmfok = control_readfile(&bmf,"control/badmailfrom",0); | |
119 | if (bmfok == -1) die_control(); | |
120 | if (bmfok) | |
121 | if (!constmap_init(&mapbmf,bmf.s,bmf.len,0)) die_nomem(); | |
9f4f7869 MW |
122 | |
123 | switch (control_readfile(&relayhosts, "control/relayhosts", 0)) { | |
124 | case -1: | |
125 | die_control(); | |
126 | case 1: | |
127 | relayhostsok = 1; | |
128 | if (!constmap_init(&maprelayhosts, relayhosts.s, relayhosts.len, 1)) | |
129 | die_nomem(); | |
130 | } | |
131 | ||
212b6f5d MW |
132 | |
133 | if (control_readint(&databytes,"control/databytes") == -1) die_control(); | |
134 | x = env_get("DATABYTES"); | |
135 | if (x) { scan_ulong(x,&u); databytes = u; } | |
136 | if (!(databytes + 1)) --databytes; | |
137 | ||
138 | remoteip = env_get("TCPREMOTEIP"); | |
139 | if (!remoteip) remoteip = "unknown"; | |
140 | local = env_get("TCPLOCALHOST"); | |
141 | if (!local) local = env_get("TCPLOCALIP"); | |
142 | if (!local) local = "unknown"; | |
143 | remotehost = env_get("TCPREMOTEHOST"); | |
144 | if (!remotehost) remotehost = "unknown"; | |
145 | remoteinfo = env_get("TCPREMOTEINFO"); | |
146 | relayclient = env_get("RELAYCLIENT"); | |
9f4f7869 MW |
147 | if (!relayclient && relayhostsok) { |
148 | int j; | |
149 | int l = str_len(remotehost); | |
150 | relayclient = constmap(&maprelayhosts, remotehost, l); | |
151 | if (!relayclient) for (j = 0; j < l; ++j) { | |
152 | if (remotehost[j] == '.' && | |
153 | (relayclient = constmap(&maprelayhosts, | |
154 | remotehost + j, | |
155 | l - j)) != 0) | |
156 | break; | |
2117e02e | 157 | } |
2117e02e | 158 | } |
212b6f5d | 159 | dohelo(remotehost); |
2117e02e MW |
160 | } |
161 | ||
212b6f5d MW |
162 | |
163 | stralloc addr = {0}; /* will be 0-terminated, if addrparse returns 1 */ | |
164 | ||
2117e02e MW |
165 | int addrparse(arg) |
166 | char *arg; | |
167 | { | |
212b6f5d MW |
168 | int i; |
169 | char ch; | |
170 | char terminator; | |
171 | struct ip_address ip; | |
172 | int flagesc; | |
173 | int flagquoted; | |
174 | ||
175 | terminator = '>'; | |
176 | i = str_chr(arg,'<'); | |
177 | if (arg[i]) | |
178 | arg += i + 1; | |
179 | else { /* partner should go read rfc 821 */ | |
180 | terminator = ' '; | |
181 | arg += str_chr(arg,':'); | |
182 | if (*arg == ':') ++arg; | |
183 | while (*arg == ' ') ++arg; | |
184 | } | |
185 | ||
186 | /* strip source route */ | |
187 | if (*arg == '@') while (*arg) if (*arg++ == ':') break; | |
188 | ||
189 | if (!stralloc_copys(&addr,"")) die_nomem(); | |
190 | flagesc = 0; | |
191 | flagquoted = 0; | |
192 | for (i = 0;ch = arg[i];++i) { /* copy arg to addr, stripping quotes */ | |
193 | if (flagesc) { | |
194 | if (!stralloc_append(&addr,&ch)) die_nomem(); | |
195 | flagesc = 0; | |
196 | } | |
197 | else { | |
198 | if (!flagquoted && (ch == terminator)) break; | |
199 | switch(ch) { | |
200 | case '\\': flagesc = 1; break; | |
201 | case '"': flagquoted = !flagquoted; break; | |
202 | default: if (!stralloc_append(&addr,&ch)) die_nomem(); | |
2117e02e MW |
203 | } |
204 | } | |
205 | } | |
212b6f5d MW |
206 | /* could check for termination failure here, but why bother? */ |
207 | if (!stralloc_append(&addr,"")) die_nomem(); | |
208 | ||
209 | if (liphostok) { | |
210 | i = byte_rchr(addr.s,addr.len,'@'); | |
211 | if (i < addr.len) /* if not, partner should go read rfc 821 */ | |
212 | if (addr.s[i + 1] == '[') | |
213 | if (!addr.s[i + 1 + ip_scanbracket(addr.s + i + 1,&ip)]) | |
214 | if (ipme_is(&ip)) { | |
215 | addr.len = i + 1; | |
216 | if (!stralloc_cat(&addr,&liphost)) die_nomem(); | |
217 | if (!stralloc_0(&addr)) die_nomem(); | |
2117e02e MW |
218 | } |
219 | } | |
220 | ||
212b6f5d MW |
221 | if (addr.len > 900) return 0; |
222 | return 1; | |
2117e02e MW |
223 | } |
224 | ||
212b6f5d | 225 | int bmfcheck() |
2117e02e | 226 | { |
212b6f5d MW |
227 | int j; |
228 | if (!bmfok) return 0; | |
229 | if (constmap(&mapbmf,addr.s,addr.len - 1)) return 1; | |
230 | j = byte_rchr(addr.s,addr.len,'@'); | |
231 | if (j < addr.len) | |
232 | if (constmap(&mapbmf,addr.s + j,addr.len - j - 1)) return 1; | |
233 | return 0; | |
2117e02e MW |
234 | } |
235 | ||
212b6f5d | 236 | int addrallowed() |
2117e02e | 237 | { |
212b6f5d MW |
238 | int r; |
239 | r = rcpthosts(addr.s,str_len(addr.s)); | |
240 | if (r == -1) die_control(); | |
241 | return r; | |
2117e02e MW |
242 | } |
243 | ||
212b6f5d MW |
244 | |
245 | int seenmail = 0; | |
246 | int flagbarf; /* defined if seenmail */ | |
247 | stralloc mailfrom = {0}; | |
248 | stralloc rcptto = {0}; | |
249 | ||
250 | void smtp_helo(arg) char *arg; | |
251 | { | |
252 | smtp_greet("250 "); out("\r\n"); | |
253 | seenmail = 0; dohelo(arg); | |
254 | } | |
255 | void smtp_ehlo(arg) char *arg; | |
256 | { | |
257 | smtp_greet("250-"); out("\r\n250-PIPELINING\r\n250 8BITMIME\r\n"); | |
258 | seenmail = 0; dohelo(arg); | |
259 | } | |
260 | void smtp_rset() | |
261 | { | |
262 | seenmail = 0; | |
263 | out("250 flushed\r\n"); | |
264 | } | |
265 | void smtp_mail(arg) char *arg; | |
266 | { | |
267 | if (!addrparse(arg)) { err_syntax(); return; } | |
268 | flagbarf = bmfcheck(); | |
269 | seenmail = 1; | |
270 | if (!stralloc_copys(&rcptto,"")) die_nomem(); | |
271 | if (!stralloc_copys(&mailfrom,addr.s)) die_nomem(); | |
272 | if (!stralloc_0(&mailfrom)) die_nomem(); | |
273 | out("250 ok\r\n"); | |
274 | } | |
2117e02e | 275 | void smtp_rcpt(arg) char *arg; { |
212b6f5d MW |
276 | if (!seenmail) { err_wantmail(); return; } |
277 | if (!addrparse(arg)) { err_syntax(); return; } | |
278 | if (flagbarf) { err_bmf(); return; } | |
279 | if (relayclient) { | |
280 | --addr.len; | |
281 | if (!stralloc_cats(&addr,relayclient)) die_nomem(); | |
282 | if (!stralloc_0(&addr)) die_nomem(); | |
2117e02e | 283 | } |
212b6f5d MW |
284 | else |
285 | if (!addrallowed()) { err_nogateway(); return; } | |
286 | if (!stralloc_cats(&rcptto,"T")) die_nomem(); | |
287 | if (!stralloc_cats(&rcptto,addr.s)) die_nomem(); | |
288 | if (!stralloc_0(&rcptto)) die_nomem(); | |
289 | out("250 ok\r\n"); | |
290 | } | |
2117e02e | 291 | |
212b6f5d MW |
292 | |
293 | int saferead(fd,buf,len) int fd; char *buf; int len; | |
2117e02e | 294 | { |
212b6f5d MW |
295 | int r; |
296 | flush(); | |
297 | r = timeoutread(timeout,fd,buf,len); | |
298 | if (r == -1) if (errno == error_timeout) die_alarm(); | |
299 | if (r <= 0) die_read(); | |
300 | return r; | |
2117e02e MW |
301 | } |
302 | ||
212b6f5d MW |
303 | char ssinbuf[1024]; |
304 | substdio ssin = SUBSTDIO_FDBUF(saferead,0,ssinbuf,sizeof ssinbuf); | |
305 | ||
306 | struct qmail qqt; | |
307 | unsigned int bytestooverflow = 0; | |
308 | ||
309 | void put(ch) | |
310 | char *ch; | |
311 | { | |
312 | if (bytestooverflow) | |
313 | if (!--bytestooverflow) | |
314 | qmail_fail(&qqt); | |
315 | qmail_put(&qqt,ch,1); | |
2117e02e MW |
316 | } |
317 | ||
212b6f5d MW |
318 | void blast(hops) |
319 | int *hops; | |
2117e02e | 320 | { |
212b6f5d MW |
321 | char ch; |
322 | int state; | |
323 | int flaginheader; | |
324 | int pos; /* number of bytes since most recent \n, if fih */ | |
325 | int flagmaybex; /* 1 if this line might match RECEIVED, if fih */ | |
326 | int flagmaybey; /* 1 if this line might match \r\n, if fih */ | |
327 | int flagmaybez; /* 1 if this line might match DELIVERED, if fih */ | |
328 | ||
329 | state = 1; | |
330 | *hops = 0; | |
331 | flaginheader = 1; | |
332 | pos = 0; flagmaybex = flagmaybey = flagmaybez = 1; | |
333 | for (;;) { | |
334 | substdio_get(&ssin,&ch,1); | |
335 | if (flaginheader) { | |
336 | if (pos < 9) { | |
337 | if (ch != "delivered"[pos]) if (ch != "DELIVERED"[pos]) flagmaybez = 0; | |
338 | if (flagmaybez) if (pos == 8) ++*hops; | |
339 | if (pos < 8) | |
340 | if (ch != "received"[pos]) if (ch != "RECEIVED"[pos]) flagmaybex = 0; | |
341 | if (flagmaybex) if (pos == 7) ++*hops; | |
342 | if (pos < 2) if (ch != "\r\n"[pos]) flagmaybey = 0; | |
343 | if (flagmaybey) if (pos == 1) flaginheader = 0; | |
2117e02e | 344 | } |
212b6f5d MW |
345 | ++pos; |
346 | if (ch == '\n') { pos = 0; flagmaybex = flagmaybey = flagmaybez = 1; } | |
347 | } | |
348 | switch(state) { | |
349 | case 0: | |
350 | if (ch == '\n') straynewline(); | |
351 | if (ch == '\r') { state = 4; continue; } | |
352 | break; | |
353 | case 1: /* \r\n */ | |
354 | if (ch == '\n') straynewline(); | |
355 | if (ch == '.') { state = 2; continue; } | |
356 | if (ch == '\r') { state = 4; continue; } | |
357 | state = 0; | |
358 | break; | |
359 | case 2: /* \r\n + . */ | |
360 | if (ch == '\n') straynewline(); | |
361 | if (ch == '\r') { state = 3; continue; } | |
362 | state = 0; | |
363 | break; | |
364 | case 3: /* \r\n + .\r */ | |
365 | if (ch == '\n') return; | |
366 | put("."); | |
367 | put("\r"); | |
368 | if (ch == '\r') { state = 4; continue; } | |
369 | state = 0; | |
370 | break; | |
371 | case 4: /* + \r */ | |
372 | if (ch == '\n') { state = 1; break; } | |
373 | if (ch != '\r') { put("\r"); state = 0; } | |
374 | } | |
375 | put(&ch); | |
2117e02e | 376 | } |
2117e02e MW |
377 | } |
378 | ||
212b6f5d MW |
379 | char accept_buf[FMT_ULONG]; |
380 | void acceptmessage(qp) unsigned long qp; | |
2117e02e | 381 | { |
212b6f5d MW |
382 | datetime_sec when; |
383 | when = now(); | |
384 | out("250 ok "); | |
385 | accept_buf[fmt_ulong(accept_buf,(unsigned long) when)] = 0; | |
386 | out(accept_buf); | |
387 | out(" qp "); | |
388 | accept_buf[fmt_ulong(accept_buf,qp)] = 0; | |
389 | out(accept_buf); | |
390 | out("\r\n"); | |
391 | } | |
392 | ||
393 | void smtp_data() { | |
394 | int hops; | |
395 | unsigned long qp; | |
396 | char *qqx; | |
397 | ||
398 | if (!seenmail) { err_wantmail(); return; } | |
399 | if (!rcptto.len) { err_wantrcpt(); return; } | |
400 | seenmail = 0; | |
401 | if (databytes) bytestooverflow = databytes + 1; | |
402 | if (qmail_open(&qqt) == -1) { err_qqt(); return; } | |
403 | qp = qmail_qp(&qqt); | |
404 | out("354 go ahead\r\n"); | |
405 | ||
406 | received(&qqt,"SMTP",local,remoteip,remotehost,remoteinfo,fakehelo); | |
407 | blast(&hops); | |
408 | hops = (hops >= MAXHOPS); | |
409 | if (hops) qmail_fail(&qqt); | |
410 | qmail_from(&qqt,mailfrom.s); | |
411 | qmail_put(&qqt,rcptto.s,rcptto.len); | |
412 | ||
413 | qqx = qmail_close(&qqt); | |
414 | if (!*qqx) { acceptmessage(qp); return; } | |
415 | if (hops) { out("554 too many hops, this message is looping (#5.4.6)\r\n"); return; } | |
416 | if (databytes) if (!bytestooverflow) { out("552 sorry, that message size exceeds my databytes limit (#5.3.4)\r\n"); return; } | |
417 | if (*qqx == 'D') out("554 "); else out("451 "); | |
418 | out(qqx + 1); | |
419 | out("\r\n"); | |
2117e02e MW |
420 | } |
421 | ||
212b6f5d MW |
422 | struct commands smtpcommands[] = { |
423 | { "rcpt", smtp_rcpt, 0 } | |
424 | , { "mail", smtp_mail, 0 } | |
425 | , { "data", smtp_data, flush } | |
426 | , { "quit", smtp_quit, flush } | |
427 | , { "helo", smtp_helo, flush } | |
428 | , { "ehlo", smtp_ehlo, flush } | |
429 | , { "rset", smtp_rset, 0 } | |
430 | , { "help", smtp_help, flush } | |
431 | , { "noop", err_noop, flush } | |
432 | , { "vrfy", err_vrfy, flush } | |
433 | , { 0, err_unimpl, flush } | |
434 | } ; | |
435 | ||
2117e02e MW |
436 | void main() |
437 | { | |
212b6f5d MW |
438 | sig_pipeignore(); |
439 | if (chdir(auto_qmail) == -1) die_control(); | |
440 | setup(); | |
441 | if (ipme_init() != 1) die_ipme(); | |
442 | smtp_greet("220 "); | |
443 | out(" ESMTP\r\n"); | |
444 | if (commands(&ssin,&smtpcommands) == 0) die_read(); | |
445 | die_nomem(); | |
2117e02e | 446 | } |