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Annotation of 43BSDReno/usr.sbin/sendmail/src/recipient.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Eric P. Allman
        !             3:  * Copyright (c) 1988 Regents of the University of California.
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * Redistribution and use in source and binary forms are permitted provided
        !             7:  * that: (1) source distributions retain this entire copyright notice and
        !             8:  * comment, and (2) distributions including binaries display the following
        !             9:  * acknowledgement:  ``This product includes software developed by the
        !            10:  * University of California, Berkeley and its contributors'' in the
        !            11:  * documentation or other materials provided with the distribution and in
        !            12:  * all advertising materials mentioning features or use of this software.
        !            13:  * Neither the name of the University nor the names of its contributors may
        !            14:  * be used to endorse or promote products derived from this software without
        !            15:  * specific prior written permission.
        !            16:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            19:  */
        !            20: 
        !            21: #ifndef lint
        !            22: static char sccsid[] = "@(#)recipient.c        5.18 (Berkeley) 6/1/90";
        !            23: #endif /* not lint */
        !            24: 
        !            25: # include <sys/types.h>
        !            26: # include <sys/stat.h>
        !            27: # include <pwd.h>
        !            28: # include "sendmail.h"
        !            29: 
        !            30: /*
        !            31: **  SENDTOLIST -- Designate a send list.
        !            32: **
        !            33: **     The parameter is a comma-separated list of people to send to.
        !            34: **     This routine arranges to send to all of them.
        !            35: **
        !            36: **     Parameters:
        !            37: **             list -- the send list.
        !            38: **             ctladdr -- the address template for the person to
        !            39: **                     send to -- effective uid/gid are important.
        !            40: **                     This is typically the alias that caused this
        !            41: **                     expansion.
        !            42: **             sendq -- a pointer to the head of a queue to put
        !            43: **                     these people into.
        !            44: **
        !            45: **     Returns:
        !            46: **             none
        !            47: **
        !            48: **     Side Effects:
        !            49: **             none.
        !            50: */
        !            51: 
        !            52: # define MAXRCRSN      10
        !            53: 
        !            54: sendtolist(list, ctladdr, sendq)
        !            55:        char *list;
        !            56:        ADDRESS *ctladdr;
        !            57:        ADDRESS **sendq;
        !            58: {
        !            59:        register char *p;
        !            60:        register ADDRESS *al;   /* list of addresses to send to */
        !            61:        bool firstone;          /* set on first address sent */
        !            62:        bool selfref;           /* set if this list includes ctladdr */
        !            63:        char delimiter;         /* the address delimiter */
        !            64: 
        !            65:        if (tTd(25, 1))
        !            66:        {
        !            67:                printf("sendto: %s\n   ctladdr=", list);
        !            68:                printaddr(ctladdr, FALSE);
        !            69:        }
        !            70: 
        !            71:        /* heuristic to determine old versus new style addresses */
        !            72:        if (ctladdr == NULL &&
        !            73:            (index(list, ',') != NULL || index(list, ';') != NULL ||
        !            74:             index(list, '<') != NULL || index(list, '(') != NULL))
        !            75:                CurEnv->e_flags &= ~EF_OLDSTYLE;
        !            76:        delimiter = ' ';
        !            77:        if (!bitset(EF_OLDSTYLE, CurEnv->e_flags) || ctladdr != NULL)
        !            78:                delimiter = ',';
        !            79: 
        !            80:        firstone = TRUE;
        !            81:        selfref = FALSE;
        !            82:        al = NULL;
        !            83: 
        !            84:        for (p = list; *p != '\0'; )
        !            85:        {
        !            86:                register ADDRESS *a;
        !            87:                extern char *DelimChar;         /* defined in prescan */
        !            88: 
        !            89:                /* parse the address */
        !            90:                while (isspace(*p) || *p == ',')
        !            91:                        p++;
        !            92:                a = parseaddr(p, (ADDRESS *) NULL, 1, delimiter);
        !            93:                p = DelimChar;
        !            94:                if (a == NULL)
        !            95:                        continue;
        !            96:                a->q_next = al;
        !            97:                a->q_alias = ctladdr;
        !            98: 
        !            99:                /* see if this should be marked as a primary address */
        !           100:                if (ctladdr == NULL ||
        !           101:                    (firstone && *p == '\0' && bitset(QPRIMARY, ctladdr->q_flags)))
        !           102:                        a->q_flags |= QPRIMARY;
        !           103: 
        !           104:                /* put on send queue or suppress self-reference */
        !           105:                if (ctladdr != NULL && sameaddr(ctladdr, a))
        !           106:                        selfref = TRUE;
        !           107:                else
        !           108:                        al = a;
        !           109:                firstone = FALSE;
        !           110:        }
        !           111: 
        !           112:        /* if this alias doesn't include itself, delete ctladdr */
        !           113:        if (!selfref && ctladdr != NULL)
        !           114:                ctladdr->q_flags |= QDONTSEND;
        !           115: 
        !           116:        /* arrange to send to everyone on the local send list */
        !           117:        while (al != NULL)
        !           118:        {
        !           119:                register ADDRESS *a = al;
        !           120:                extern ADDRESS *recipient();
        !           121: 
        !           122:                al = a->q_next;
        !           123:                setctladdr(a);
        !           124:                a = recipient(a, sendq);
        !           125: 
        !           126:                /* arrange to inherit full name */
        !           127:                if (a->q_fullname == NULL && ctladdr != NULL)
        !           128:                        a->q_fullname = ctladdr->q_fullname;
        !           129:        }
        !           130: 
        !           131:        CurEnv->e_to = NULL;
        !           132: }
        !           133: /*
        !           134: **  RECIPIENT -- Designate a message recipient
        !           135: **
        !           136: **     Saves the named person for future mailing.
        !           137: **
        !           138: **     Parameters:
        !           139: **             a -- the (preparsed) address header for the recipient.
        !           140: **             sendq -- a pointer to the head of a queue to put the
        !           141: **                     recipient in.  Duplicate supression is done
        !           142: **                     in this queue.
        !           143: **
        !           144: **     Returns:
        !           145: **             The actual address in the queue.  This will be "a" if
        !           146: **             the address is not a duplicate, else the original address.
        !           147: **
        !           148: **     Side Effects:
        !           149: **             none.
        !           150: */
        !           151: 
        !           152: ADDRESS *
        !           153: recipient(a, sendq)
        !           154:        register ADDRESS *a;
        !           155:        register ADDRESS **sendq;
        !           156: {
        !           157:        register ADDRESS *q;
        !           158:        ADDRESS **pq;
        !           159:        register struct mailer *m;
        !           160:        register char *p;
        !           161:        bool quoted = FALSE;            /* set if the addr has a quote bit */
        !           162:        char buf[MAXNAME];              /* unquoted image of the user name */
        !           163:        extern ADDRESS *getctladdr();
        !           164:        extern bool safefile();
        !           165: 
        !           166:        CurEnv->e_to = a->q_paddr;
        !           167:        m = a->q_mailer;
        !           168:        errno = 0;
        !           169:        if (tTd(26, 1))
        !           170:        {
        !           171:                printf("\nrecipient: ");
        !           172:                printaddr(a, FALSE);
        !           173:        }
        !           174: 
        !           175:        /* break aliasing loops */
        !           176:        if (AliasLevel > MAXRCRSN)
        !           177:        {
        !           178:                usrerr("aliasing/forwarding loop broken");
        !           179:                return (a);
        !           180:        }
        !           181: 
        !           182:        /*
        !           183:        **  Finish setting up address structure.
        !           184:        */
        !           185: 
        !           186:        /* set the queue timeout */
        !           187:        a->q_timeout = TimeOut;
        !           188: 
        !           189:        /* map user & host to lower case if requested on non-aliases */
        !           190:        if (a->q_alias == NULL)
        !           191:                loweraddr(a);
        !           192: 
        !           193:        /* get unquoted user for file, program or user.name check */
        !           194:        (void) strcpy(buf, a->q_user);
        !           195:        for (p = buf; *p != '\0' && !quoted; p++)
        !           196:        {
        !           197:                if (!isascii(*p) && (*p & 0377) != (SpaceSub & 0377))
        !           198:                        quoted = TRUE;
        !           199:        }
        !           200:        stripquotes(buf, TRUE);
        !           201: 
        !           202:        /* do sickly crude mapping for program mailing, etc. */
        !           203:        if (m == LocalMailer && buf[0] == '|')
        !           204:        {
        !           205:                a->q_mailer = m = ProgMailer;
        !           206:                a->q_user++;
        !           207:                if (a->q_alias == NULL && !QueueRun && !ForceMail)
        !           208:                {
        !           209:                        a->q_flags |= QDONTSEND|QBADADDR;
        !           210:                        usrerr("Cannot mail directly to programs");
        !           211:                }
        !           212:        }
        !           213: 
        !           214:        /*
        !           215:        **  Look up this person in the recipient list.
        !           216:        **      If they are there already, return, otherwise continue.
        !           217:        **      If the list is empty, just add it.  Notice the cute
        !           218:        **      hack to make from addresses suppress things correctly:
        !           219:        **      the QDONTSEND bit will be set in the send list.
        !           220:        **      [Please note: the emphasis is on "hack."]
        !           221:        */
        !           222: 
        !           223:        for (pq = sendq; (q = *pq) != NULL; pq = &q->q_next)
        !           224:        {
        !           225:                if (!ForceMail && sameaddr(q, a))
        !           226:                {
        !           227:                        if (tTd(26, 1))
        !           228:                        {
        !           229:                                printf("%s in sendq: ", a->q_paddr);
        !           230:                                printaddr(q, FALSE);
        !           231:                        }
        !           232:                        if (!bitset(QDONTSEND, a->q_flags))
        !           233:                                message(Arpa_Info, "duplicate suppressed");
        !           234:                        if (!bitset(QPRIMARY, q->q_flags))
        !           235:                                q->q_flags |= a->q_flags;
        !           236:                        return (q);
        !           237:                }
        !           238:        }
        !           239: 
        !           240:        /* add address on list */
        !           241:        *pq = a;
        !           242:        a->q_next = NULL;
        !           243:        CurEnv->e_nrcpts++;
        !           244: 
        !           245:        /*
        !           246:        **  Alias the name and handle :include: specs.
        !           247:        */
        !           248: 
        !           249:        if (m == LocalMailer && !bitset(QDONTSEND, a->q_flags))
        !           250:        {
        !           251:                if (strncmp(a->q_user, ":include:", 9) == 0)
        !           252:                {
        !           253:                        a->q_flags |= QDONTSEND;
        !           254:                        if (a->q_alias == NULL && !QueueRun && !ForceMail)
        !           255:                        {
        !           256:                                a->q_flags |= QBADADDR;
        !           257:                                usrerr("Cannot mail directly to :include:s");
        !           258:                        }
        !           259:                        else
        !           260:                        {
        !           261:                                message(Arpa_Info, "including file %s", &a->q_user[9]);
        !           262:                                include(&a->q_user[9], " sending", a, sendq);
        !           263:                        }
        !           264:                }
        !           265:                else
        !           266:                        alias(a, sendq);
        !           267:        }
        !           268: 
        !           269:        /*
        !           270:        **  If the user is local and still being sent, verify that
        !           271:        **  the address is good.  If it is, try to forward.
        !           272:        **  If the address is already good, we have a forwarding
        !           273:        **  loop.  This can be broken by just sending directly to
        !           274:        **  the user (which is probably correct anyway).
        !           275:        */
        !           276: 
        !           277:        if (!bitset(QDONTSEND, a->q_flags) && m == LocalMailer)
        !           278:        {
        !           279:                struct stat stb;
        !           280:                extern bool writable();
        !           281: 
        !           282:                /* see if this is to a file */
        !           283:                if (buf[0] == '/')
        !           284:                {
        !           285:                        p = rindex(buf, '/');
        !           286:                        /* check if writable or creatable */
        !           287:                        if (a->q_alias == NULL && !QueueRun && !ForceMail)
        !           288:                        {
        !           289:                                a->q_flags |= QDONTSEND|QBADADDR;
        !           290:                                usrerr("Cannot mail directly to files");
        !           291:                        }
        !           292:                        else if ((stat(buf, &stb) >= 0) ? (!writable(&stb)) :
        !           293:                            (*p = '\0', !safefile(buf, getruid(), S_IWRITE|S_IEXEC)))
        !           294:                        {
        !           295:                                a->q_flags |= QBADADDR;
        !           296:                                giveresponse(EX_CANTCREAT, m, CurEnv);
        !           297:                        }
        !           298:                }
        !           299:                else
        !           300:                {
        !           301:                        register struct passwd *pw;
        !           302:                        extern struct passwd *finduser();
        !           303: 
        !           304:                        /* warning -- finduser may trash buf */
        !           305:                        pw = finduser(buf);
        !           306:                        if (pw == NULL)
        !           307:                        {
        !           308:                                a->q_flags |= QBADADDR;
        !           309:                                giveresponse(EX_NOUSER, m, CurEnv);
        !           310:                        }
        !           311:                        else
        !           312:                        {
        !           313:                                char nbuf[MAXNAME];
        !           314: 
        !           315:                                if (strcmp(a->q_user, pw->pw_name) != 0)
        !           316:                                {
        !           317:                                        a->q_user = newstr(pw->pw_name);
        !           318:                                        (void) strcpy(buf, pw->pw_name);
        !           319:                                }
        !           320:                                a->q_home = newstr(pw->pw_dir);
        !           321:                                a->q_uid = pw->pw_uid;
        !           322:                                a->q_gid = pw->pw_gid;
        !           323:                                a->q_flags |= QGOODUID;
        !           324:                                buildfname(pw->pw_gecos, pw->pw_name, nbuf);
        !           325:                                if (nbuf[0] != '\0')
        !           326:                                        a->q_fullname = newstr(nbuf);
        !           327:                                if (!quoted)
        !           328:                                        forward(a, sendq);
        !           329:                        }
        !           330:                }
        !           331:        }
        !           332:        return (a);
        !           333: }
        !           334: /*
        !           335: **  FINDUSER -- find the password entry for a user.
        !           336: **
        !           337: **     This looks a lot like getpwnam, except that it may want to
        !           338: **     do some fancier pattern matching in /etc/passwd.
        !           339: **
        !           340: **     This routine contains most of the time of many sendmail runs.
        !           341: **     It deserves to be optimized.
        !           342: **
        !           343: **     Parameters:
        !           344: **             name -- the name to match against.
        !           345: **
        !           346: **     Returns:
        !           347: **             A pointer to a pw struct.
        !           348: **             NULL if name is unknown or ambiguous.
        !           349: **
        !           350: **     Side Effects:
        !           351: **             may modify name.
        !           352: */
        !           353: 
        !           354: struct passwd *
        !           355: finduser(name)
        !           356:        char *name;
        !           357: {
        !           358:        register struct passwd *pw;
        !           359:        register char *p;
        !           360:        extern struct passwd *getpwent();
        !           361:        extern struct passwd *getpwnam();
        !           362: 
        !           363:        /* map upper => lower case */
        !           364:        for (p = name; *p != '\0'; p++)
        !           365:        {
        !           366:                if (isascii(*p) && isupper(*p))
        !           367:                        *p = tolower(*p);
        !           368:        }
        !           369: 
        !           370:        /* look up this login name using fast path */
        !           371:        if ((pw = getpwnam(name)) != NULL)
        !           372:                return (pw);
        !           373: 
        !           374:        /* search for a matching full name instead */
        !           375:        for (p = name; *p != '\0'; p++)
        !           376:        {
        !           377:                if (*p == (SpaceSub & 0177) || *p == '_')
        !           378:                        *p = ' ';
        !           379:        }
        !           380:        (void) setpwent();
        !           381:        while ((pw = getpwent()) != NULL)
        !           382:        {
        !           383:                char buf[MAXNAME];
        !           384: 
        !           385:                buildfname(pw->pw_gecos, pw->pw_name, buf);
        !           386:                if (index(buf, ' ') != NULL && !strcasecmp(buf, name))
        !           387:                {
        !           388:                        message(Arpa_Info, "sending to login name %s", pw->pw_name);
        !           389:                        return (pw);
        !           390:                }
        !           391:        }
        !           392:        return (NULL);
        !           393: }
        !           394: /*
        !           395: **  WRITABLE -- predicate returning if the file is writable.
        !           396: **
        !           397: **     This routine must duplicate the algorithm in sys/fio.c.
        !           398: **     Unfortunately, we cannot use the access call since we
        !           399: **     won't necessarily be the real uid when we try to
        !           400: **     actually open the file.
        !           401: **
        !           402: **     Notice that ANY file with ANY execute bit is automatically
        !           403: **     not writable.  This is also enforced by mailfile.
        !           404: **
        !           405: **     Parameters:
        !           406: **             s -- pointer to a stat struct for the file.
        !           407: **
        !           408: **     Returns:
        !           409: **             TRUE -- if we will be able to write this file.
        !           410: **             FALSE -- if we cannot write this file.
        !           411: **
        !           412: **     Side Effects:
        !           413: **             none.
        !           414: */
        !           415: 
        !           416: bool
        !           417: writable(s)
        !           418:        register struct stat *s;
        !           419: {
        !           420:        int euid, egid;
        !           421:        int bits;
        !           422: 
        !           423:        if (bitset(0111, s->st_mode))
        !           424:                return (FALSE);
        !           425:        euid = getruid();
        !           426:        egid = getrgid();
        !           427:        if (geteuid() == 0)
        !           428:        {
        !           429:                if (bitset(S_ISUID, s->st_mode))
        !           430:                        euid = s->st_uid;
        !           431:                if (bitset(S_ISGID, s->st_mode))
        !           432:                        egid = s->st_gid;
        !           433:        }
        !           434: 
        !           435:        if (euid == 0)
        !           436:                return (TRUE);
        !           437:        bits = S_IWRITE;
        !           438:        if (euid != s->st_uid)
        !           439:        {
        !           440:                bits >>= 3;
        !           441:                if (egid != s->st_gid)
        !           442:                        bits >>= 3;
        !           443:        }
        !           444:        return ((s->st_mode & bits) != 0);
        !           445: }
        !           446: /*
        !           447: **  INCLUDE -- handle :include: specification.
        !           448: **
        !           449: **     Parameters:
        !           450: **             fname -- filename to include.
        !           451: **             msg -- message to print in verbose mode.
        !           452: **             ctladdr -- address template to use to fill in these
        !           453: **                     addresses -- effective user/group id are
        !           454: **                     the important things.
        !           455: **             sendq -- a pointer to the head of the send queue
        !           456: **                     to put these addresses in.
        !           457: **
        !           458: **     Returns:
        !           459: **             none.
        !           460: **
        !           461: **     Side Effects:
        !           462: **             reads the :include: file and sends to everyone
        !           463: **             listed in that file.
        !           464: */
        !           465: 
        !           466: include(fname, msg, ctladdr, sendq)
        !           467:        char *fname;
        !           468:        char *msg;
        !           469:        ADDRESS *ctladdr;
        !           470:        ADDRESS **sendq;
        !           471: {
        !           472:        char buf[MAXLINE];
        !           473:        register FILE *fp;
        !           474:        char *oldto = CurEnv->e_to;
        !           475:        char *oldfilename = FileName;
        !           476:        int oldlinenumber = LineNumber;
        !           477: 
        !           478:        fp = fopen(fname, "r");
        !           479:        if (fp == NULL)
        !           480:        {
        !           481:                usrerr("Cannot open %s", fname);
        !           482:                return;
        !           483:        }
        !           484:        if (getctladdr(ctladdr) == NULL)
        !           485:        {
        !           486:                struct stat st;
        !           487: 
        !           488:                if (fstat(fileno(fp), &st) < 0)
        !           489:                        syserr("Cannot fstat %s!", fname);
        !           490:                ctladdr->q_uid = st.st_uid;
        !           491:                ctladdr->q_gid = st.st_gid;
        !           492:                ctladdr->q_flags |= QGOODUID;
        !           493:        }
        !           494: 
        !           495:        /* read the file -- each line is a comma-separated list. */
        !           496:        FileName = fname;
        !           497:        LineNumber = 0;
        !           498:        while (fgets(buf, sizeof buf, fp) != NULL)
        !           499:        {
        !           500:                register char *p = index(buf, '\n');
        !           501: 
        !           502:                LineNumber++;
        !           503:                if (p != NULL)
        !           504:                        *p = '\0';
        !           505:                if (buf[0] == '\0')
        !           506:                        continue;
        !           507:                CurEnv->e_to = oldto;
        !           508:                message(Arpa_Info, "%s to %s", msg, buf);
        !           509:                AliasLevel++;
        !           510:                sendtolist(buf, ctladdr, sendq);
        !           511:                AliasLevel--;
        !           512:        }
        !           513: 
        !           514:        (void) fclose(fp);
        !           515:        FileName = oldfilename;
        !           516:        LineNumber = oldlinenumber;
        !           517: }
        !           518: /*
        !           519: **  SENDTOARGV -- send to an argument vector.
        !           520: **
        !           521: **     Parameters:
        !           522: **             argv -- argument vector to send to.
        !           523: **
        !           524: **     Returns:
        !           525: **             none.
        !           526: **
        !           527: **     Side Effects:
        !           528: **             puts all addresses on the argument vector onto the
        !           529: **                     send queue.
        !           530: */
        !           531: 
        !           532: sendtoargv(argv)
        !           533:        register char **argv;
        !           534: {
        !           535:        register char *p;
        !           536: 
        !           537:        while ((p = *argv++) != NULL)
        !           538:        {
        !           539:                if (argv[0] != NULL && argv[1] != NULL && !strcasecmp(argv[0], "at"))
        !           540:                {
        !           541:                        char nbuf[MAXNAME];
        !           542: 
        !           543:                        if (strlen(p) + strlen(argv[1]) + 2 > sizeof nbuf)
        !           544:                                usrerr("address overflow");
        !           545:                        else
        !           546:                        {
        !           547:                                (void) strcpy(nbuf, p);
        !           548:                                (void) strcat(nbuf, "@");
        !           549:                                (void) strcat(nbuf, argv[1]);
        !           550:                                p = newstr(nbuf);
        !           551:                                argv += 2;
        !           552:                        }
        !           553:                }
        !           554:                sendtolist(p, (ADDRESS *) NULL, &CurEnv->e_sendqueue);
        !           555:        }
        !           556: }
        !           557: /*
        !           558: **  GETCTLADDR -- get controlling address from an address header.
        !           559: **
        !           560: **     If none, get one corresponding to the effective userid.
        !           561: **
        !           562: **     Parameters:
        !           563: **             a -- the address to find the controller of.
        !           564: **
        !           565: **     Returns:
        !           566: **             the controlling address.
        !           567: **
        !           568: **     Side Effects:
        !           569: **             none.
        !           570: */
        !           571: 
        !           572: ADDRESS *
        !           573: getctladdr(a)
        !           574:        register ADDRESS *a;
        !           575: {
        !           576:        while (a != NULL && !bitset(QGOODUID, a->q_flags))
        !           577:                a = a->q_alias;
        !           578:        return (a);
        !           579: }

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