1 # include <pwd.h>
2 # include "sendmail.h"
3 # include <sys/stat.h>
4 
5 SCCSID(@(#)recipient.c	3.53		05/20/83);
6 
7 /*
8 **  SENDTOLIST -- Designate a send list.
9 **
10 **	The parameter is a comma-separated list of people to send to.
11 **	This routine arranges to send to all of them.
12 **
13 **	Parameters:
14 **		list -- the send list.
15 **		ctladdr -- the address template for the person to
16 **			send to -- effective uid/gid are important.
17 **			This is typically the alias that caused this
18 **			expansion.
19 **		sendq -- a pointer to the head of a queue to put
20 **			these people into.
21 **
22 **	Returns:
23 **		none
24 **
25 **	Side Effects:
26 **		none.
27 */
28 
29 # define MAXRCRSN	10
30 
31 sendtolist(list, ctladdr, sendq)
32 	char *list;
33 	ADDRESS *ctladdr;
34 	ADDRESS **sendq;
35 {
36 	register char *p;
37 	register ADDRESS *al;	/* list of addresses to send to */
38 	bool firstone;		/* set on first address sent */
39 	bool selfref;		/* set if this list includes ctladdr */
40 	char delimiter;		/* the address delimiter */
41 
42 # ifdef DEBUG
43 	if (tTd(25, 1))
44 	{
45 		printf("sendto: %s\n   ctladdr=", list);
46 		printaddr(ctladdr, FALSE);
47 	}
48 # endif DEBUG
49 
50 	/* heuristic to determine old versus new style addresses */
51 	if (ctladdr == NULL &&
52 	    (index(list, ',') != NULL || index(list, ';') != NULL ||
53 	     index(list, '<') != NULL || index(list, '(') != NULL))
54 		CurEnv->e_flags &= ~EF_OLDSTYLE;
55 	delimiter = ' ';
56 	if (!bitset(EF_OLDSTYLE, CurEnv->e_flags) || ctladdr != NULL)
57 		delimiter = ',';
58 
59 	firstone = TRUE;
60 	selfref = FALSE;
61 	al = NULL;
62 
63 	for (p = list; *p != '\0'; )
64 	{
65 		register ADDRESS *a;
66 		extern char *DelimChar;		/* defined in prescan */
67 
68 		/* parse the address */
69 		while (isspace(*p) || *p == ',')
70 			p++;
71 		a = parseaddr(p, (ADDRESS *) NULL, 1, delimiter);
72 		p = DelimChar;
73 		if (a == NULL)
74 			continue;
75 		a->q_next = al;
76 		a->q_alias = ctladdr;
77 
78 		/* see if this should be marked as a primary address */
79 		if (ctladdr == NULL ||
80 		    (firstone && *p == '\0' && bitset(QPRIMARY, ctladdr->q_flags)))
81 			a->q_flags |= QPRIMARY;
82 
83 		/* put on send queue or suppress self-reference */
84 		if (ctladdr != NULL && sameaddr(ctladdr, a))
85 			selfref = TRUE;
86 		else
87 			al = a;
88 		firstone = FALSE;
89 	}
90 
91 	/* if this alias doesn't include itself, delete ctladdr */
92 	if (!selfref && ctladdr != NULL)
93 		ctladdr->q_flags |= QDONTSEND;
94 
95 	/* arrange to send to everyone on the local send list */
96 	while (al != NULL)
97 	{
98 		register ADDRESS *a = al;
99 		extern ADDRESS *recipient();
100 
101 		al = a->q_next;
102 		a = recipient(a, sendq);
103 
104 		/* arrange to inherit full name */
105 		if (a->q_fullname == NULL && ctladdr != NULL)
106 			a->q_fullname = ctladdr->q_fullname;
107 	}
108 
109 	CurEnv->e_to = NULL;
110 }
111 /*
112 **  RECIPIENT -- Designate a message recipient
113 **
114 **	Saves the named person for future mailing.
115 **
116 **	Parameters:
117 **		a -- the (preparsed) address header for the recipient.
118 **		sendq -- a pointer to the head of a queue to put the
119 **			recipient in.  Duplicate supression is done
120 **			in this queue.
121 **
122 **	Returns:
123 **		The actual address in the queue.  This will be "a" if
124 **		the address is not a duplicate, else the original address.
125 **
126 **	Side Effects:
127 **		none.
128 */
129 
130 ADDRESS *
131 recipient(a, sendq)
132 	register ADDRESS *a;
133 	register ADDRESS **sendq;
134 {
135 	register ADDRESS *q;
136 	ADDRESS **pq;
137 	register struct mailer *m;
138 	register char *p;
139 	bool quoted = FALSE;		/* set if the addr has a quote bit */
140 	char buf[MAXNAME];		/* unquoted image of the user name */
141 	extern ADDRESS *getctladdr();
142 	extern bool safefile();
143 
144 	CurEnv->e_to = a->q_paddr;
145 	m = a->q_mailer;
146 	errno = 0;
147 # ifdef DEBUG
148 	if (tTd(26, 1))
149 	{
150 		printf("\nrecipient: ");
151 		printaddr(a, FALSE);
152 	}
153 # endif DEBUG
154 
155 	/* break aliasing loops */
156 	if (AliasLevel > MAXRCRSN)
157 	{
158 		usrerr("aliasing/forwarding loop broken");
159 		return (a);
160 	}
161 
162 	/*
163 	**  Finish setting up address structure.
164 	*/
165 
166 	a->q_timeout = TimeOut;
167 
168 	(void) strcpy(buf, a->q_user);
169 	for (p = buf; *p != '\0' && !quoted; p++)
170 	{
171 		if (!isascii(*p) && (*p & 0377) != (SpaceSub & 0377))
172 			quoted = TRUE;
173 	}
174 	stripquotes(buf, TRUE);
175 
176 	/* do sickly crude mapping for program mailing, etc. */
177 	if (m == LocalMailer && buf[0] == '|')
178 	{
179 		a->q_mailer = m = ProgMailer;
180 		a->q_user++;
181 		if (a->q_alias == NULL && !tTd(0, 1) && !QueueRun && !ForceMail)
182 		{
183 			usrerr("Cannot mail directly to programs");
184 			a->q_flags |= QDONTSEND;
185 		}
186 	}
187 
188 	/*
189 	**  Look up this person in the recipient list.
190 	**	If they are there already, return, otherwise continue.
191 	**	If the list is empty, just add it.  Notice the cute
192 	**	hack to make from addresses suppress things correctly:
193 	**	the QDONTSEND bit will be set in the send list.
194 	**	[Please note: the emphasis is on "hack."]
195 	*/
196 
197 	for (pq = sendq; (q = *pq) != NULL; pq = &q->q_next)
198 	{
199 		if (!ForceMail && sameaddr(q, a))
200 		{
201 # ifdef DEBUG
202 			if (tTd(26, 1))
203 			{
204 				printf("%s in sendq: ", a->q_paddr);
205 				printaddr(q, FALSE);
206 			}
207 # endif DEBUG
208 			if (!bitset(QDONTSEND, a->q_flags))
209 				message(Arpa_Info, "duplicate suppressed");
210 			if (!bitset(QPRIMARY, q->q_flags))
211 				q->q_flags |= a->q_flags;
212 			return (q);
213 		}
214 	}
215 
216 	/* add address on list */
217 	*pq = a;
218 	a->q_next = NULL;
219 
220 	/*
221 	**  Alias the name and handle :include: specs.
222 	*/
223 
224 	if (m == LocalMailer && !bitset(QDONTSEND, a->q_flags))
225 	{
226 		if (strncmp(a->q_user, ":include:", 9) == 0)
227 		{
228 			a->q_flags |= QDONTSEND;
229 			if (a->q_alias == NULL && !tTd(0, 1) && !QueueRun && !ForceMail)
230 				usrerr("Cannot mail directly to :include:s");
231 			else
232 			{
233 				message(Arpa_Info, "including file %s", &a->q_user[9]);
234 				include(&a->q_user[9], " sending", a, sendq);
235 			}
236 		}
237 		else
238 			alias(a, sendq);
239 	}
240 
241 	/*
242 	**  If the user is local and still being sent, verify that
243 	**  the address is good.  If it is, try to forward.
244 	**  If the address is already good, we have a forwarding
245 	**  loop.  This can be broken by just sending directly to
246 	**  the user (which is probably correct anyway).
247 	*/
248 
249 	if (!bitset(QDONTSEND, a->q_flags) && m == LocalMailer)
250 	{
251 		struct stat stb;
252 		extern bool writable();
253 
254 		/* see if this is to a file */
255 		if (buf[0] == '/')
256 		{
257 			p = rindex(buf, '/');
258 			/* check if writable or creatable */
259 			if (a->q_alias == NULL && !tTd(0, 1) && !QueueRun && !ForceMail)
260 			{
261 				usrerr("Cannot mail directly to files");
262 				a->q_flags |= QDONTSEND;
263 			}
264 			else if ((stat(buf, &stb) >= 0) ? (!writable(&stb)) :
265 			    (*p = '\0', !safefile(buf, getruid(), S_IWRITE|S_IEXEC)))
266 			{
267 				a->q_flags |= QBADADDR;
268 				giveresponse(EX_CANTCREAT, m, CurEnv);
269 			}
270 		}
271 		else
272 		{
273 			register struct passwd *pw;
274 			extern struct passwd *finduser();
275 
276 			/* warning -- finduser may trash buf */
277 			pw = finduser(buf);
278 			if (pw == NULL)
279 			{
280 				a->q_flags |= QBADADDR;
281 				giveresponse(EX_NOUSER, m, CurEnv);
282 			}
283 			else
284 			{
285 				char nbuf[MAXNAME];
286 
287 				if (strcmp(a->q_user, pw->pw_name) != 0)
288 				{
289 					a->q_user = newstr(pw->pw_name);
290 					(void) strcpy(buf, pw->pw_name);
291 				}
292 				a->q_home = newstr(pw->pw_dir);
293 				a->q_uid = pw->pw_uid;
294 				a->q_gid = pw->pw_gid;
295 				a->q_flags |= QGOODUID;
296 				buildfname(pw->pw_gecos, pw->pw_name, nbuf);
297 				if (nbuf[0] != '\0')
298 					a->q_fullname = newstr(nbuf);
299 				if (!quoted)
300 					forward(a, sendq);
301 			}
302 		}
303 	}
304 	return (a);
305 }
306 /*
307 **  FINDUSER -- find the password entry for a user.
308 **
309 **	This looks a lot like getpwnam, except that it may want to
310 **	do some fancier pattern matching in /etc/passwd.
311 **
312 **	This routine contains most of the time of many sendmail runs.
313 **	It deserves to be optimized.
314 **
315 **	Parameters:
316 **		name -- the name to match against.
317 **
318 **	Returns:
319 **		A pointer to a pw struct.
320 **		NULL if name is unknown or ambiguous.
321 **
322 **	Side Effects:
323 **		may modify name.
324 */
325 
326 struct passwd *
327 finduser(name)
328 	char *name;
329 {
330 	extern struct passwd *getpwent();
331 	register struct passwd *pw;
332 	register char *p;
333 
334 	/*
335 	**  Make name canonical.
336 	*/
337 
338 	for (p = name; *p != '\0'; p++)
339 	{
340 		if (*p == (SpaceSub & 0177) || *p == '_')
341 			*p = ' ';
342 	}
343 
344 	setpwent();
345 	while ((pw = getpwent()) != NULL)
346 	{
347 		char buf[MAXNAME];
348 		extern bool sameword();
349 
350 		if (strcmp(pw->pw_name, name) == 0)
351 			return (pw);
352 		buildfname(pw->pw_gecos, pw->pw_name, buf);
353 		if (index(buf, ' ') != NULL && sameword(buf, name))
354 		{
355 			message(Arpa_Info, "sending to login name %s", pw->pw_name);
356 			return (pw);
357 		}
358 	}
359 	return (NULL);
360 }
361 /*
362 **  WRITABLE -- predicate returning if the file is writable.
363 **
364 **	This routine must duplicate the algorithm in sys/fio.c.
365 **	Unfortunately, we cannot use the access call since we
366 **	won't necessarily be the real uid when we try to
367 **	actually open the file.
368 **
369 **	Notice that ANY file with ANY execute bit is automatically
370 **	not writable.  This is also enforced by mailfile.
371 **
372 **	Parameters:
373 **		s -- pointer to a stat struct for the file.
374 **
375 **	Returns:
376 **		TRUE -- if we will be able to write this file.
377 **		FALSE -- if we cannot write this file.
378 **
379 **	Side Effects:
380 **		none.
381 */
382 
383 bool
384 writable(s)
385 	register struct stat *s;
386 {
387 	int euid, egid;
388 	int bits;
389 
390 	if (bitset(0111, s->st_mode))
391 		return (FALSE);
392 	euid = getruid();
393 	egid = getrgid();
394 	if (geteuid() == 0)
395 	{
396 		if (bitset(S_ISUID, s->st_mode))
397 			euid = s->st_uid;
398 		if (bitset(S_ISGID, s->st_mode))
399 			egid = s->st_gid;
400 	}
401 
402 	if (euid == 0)
403 		return (TRUE);
404 	bits = S_IWRITE;
405 	if (euid != s->st_uid)
406 	{
407 		bits >>= 3;
408 		if (egid != s->st_gid)
409 			bits >>= 3;
410 	}
411 	return ((s->st_mode & bits) != 0);
412 }
413 /*
414 **  INCLUDE -- handle :include: specification.
415 **
416 **	Parameters:
417 **		fname -- filename to include.
418 **		msg -- message to print in verbose mode.
419 **		ctladdr -- address template to use to fill in these
420 **			addresses -- effective user/group id are
421 **			the important things.
422 **		sendq -- a pointer to the head of the send queue
423 **			to put these addresses in.
424 **
425 **	Returns:
426 **		none.
427 **
428 **	Side Effects:
429 **		reads the :include: file and sends to everyone
430 **		listed in that file.
431 */
432 
433 include(fname, msg, ctladdr, sendq)
434 	char *fname;
435 	char *msg;
436 	ADDRESS *ctladdr;
437 	ADDRESS **sendq;
438 {
439 	char buf[MAXLINE];
440 	register FILE *fp;
441 	char *oldto = CurEnv->e_to;
442 	char *oldfilename = FileName;
443 	int oldlinenumber = LineNumber;
444 
445 	fp = fopen(fname, "r");
446 	if (fp == NULL)
447 	{
448 		usrerr("Cannot open %s", fname);
449 		return;
450 	}
451 	if (getctladdr(ctladdr) == NULL)
452 	{
453 		struct stat st;
454 
455 		if (fstat(fileno(fp), &st) < 0)
456 			syserr("Cannot fstat %s!", fname);
457 		ctladdr->q_uid = st.st_uid;
458 		ctladdr->q_gid = st.st_gid;
459 		ctladdr->q_flags |= QGOODUID;
460 	}
461 
462 	/* read the file -- each line is a comma-separated list. */
463 	FileName = fname;
464 	LineNumber = 0;
465 	while (fgets(buf, sizeof buf, fp) != NULL)
466 	{
467 		register char *p = index(buf, '\n');
468 
469 		if (p != NULL)
470 			*p = '\0';
471 		if (buf[0] == '\0')
472 			continue;
473 		CurEnv->e_to = oldto;
474 		message(Arpa_Info, "%s to %s", msg, buf);
475 		AliasLevel++;
476 		sendtolist(buf, ctladdr, sendq);
477 		AliasLevel--;
478 	}
479 
480 	(void) fclose(fp);
481 	FileName = oldfilename;
482 	LineNumber = oldlinenumber;
483 }
484 /*
485 **  SENDTOARGV -- send to an argument vector.
486 **
487 **	Parameters:
488 **		argv -- argument vector to send to.
489 **
490 **	Returns:
491 **		none.
492 **
493 **	Side Effects:
494 **		puts all addresses on the argument vector onto the
495 **			send queue.
496 */
497 
498 sendtoargv(argv)
499 	register char **argv;
500 {
501 	register char *p;
502 	extern bool sameword();
503 
504 	while ((p = *argv++) != NULL)
505 	{
506 		if (argv[0] != NULL && argv[1] != NULL && sameword(argv[0], "at"))
507 		{
508 			char nbuf[MAXNAME];
509 
510 			if (strlen(p) + strlen(argv[1]) + 2 > sizeof nbuf)
511 				usrerr("address overflow");
512 			else
513 			{
514 				(void) strcpy(nbuf, p);
515 				(void) strcat(nbuf, "@");
516 				(void) strcat(nbuf, argv[1]);
517 				p = newstr(nbuf);
518 				argv += 2;
519 			}
520 		}
521 		sendtolist(p, (ADDRESS *) NULL, &CurEnv->e_sendqueue);
522 	}
523 }
524 /*
525 **  GETCTLADDR -- get controlling address from an address header.
526 **
527 **	If none, get one corresponding to the effective userid.
528 **
529 **	Parameters:
530 **		a -- the address to find the controller of.
531 **
532 **	Returns:
533 **		the controlling address.
534 **
535 **	Side Effects:
536 **		none.
537 */
538 
539 ADDRESS *
540 getctladdr(a)
541 	register ADDRESS *a;
542 {
543 	while (a != NULL && !bitset(QGOODUID, a->q_flags))
544 		a = a->q_alias;
545 	return (a);
546 }
547