BSD 4_4_Lite1 release

[unix-history] / usr / src / usr.sbin / sendmail / src / recipient.c

diff --git a/usr/src/usr.sbin/sendmail/src/recipient.c b/usr/src/usr.sbin/sendmail/src/recipient.c
index 78780a4..c6c15c4 100644 (file)
--- a/usr/src/usr.sbin/sendmail/src/recipient.c
+++ b/usr/src/usr.sbin/sendmail/src/recipient.c
@@ -3,11 +3,37 @@
  * Copyright (c) 1988, 1993
  *     The Regents of the University of California.  All rights reserved.
  *
  * Copyright (c) 1988, 1993
  *     The Regents of the University of California.  All rights reserved.
  *

- * %sccs.include.redist.c%
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.

  */
 
 #ifndef lint
  */
 
 #ifndef lint

-static char sccsid[] = "@(#)recipient.c        8.8 (Berkeley) %G%";
+static char sccsid[] = "@(#)recipient.c        8.44 (Berkeley) 2/28/94";

 #endif /* not lint */
 
 # include "sendmail.h"
 #endif /* not lint */
 
 # include "sendmail.h"


@@ -19,12 +45,6 @@ static char sccsid[] = "@(#)recipient.c      8.8 (Berkeley) %G%";
 **     The parameter is a comma-separated list of people to send to.
 **     This routine arranges to send to all of them.
 **
 **     The parameter is a comma-separated list of people to send to.
 **     This routine arranges to send to all of them.
 **

-**     The `ctladdr' is the address that expanded to be this one,
-**     e.g., in an alias expansion.  This is used for a number of
-**     purposed, most notably inheritance of uid/gid for protection
-**     purposes.  It is also used to detect self-reference in group
-**     expansions and the like.
-**

 **     Parameters:
 **             list -- the send list.
 **             ctladdr -- the address template for the person to
 **     Parameters:
 **             list -- the send list.
 **             ctladdr -- the address template for the person to


@@ -34,10 +54,9 @@ static char sccsid[] = "@(#)recipient.c      8.8 (Berkeley) %G%";
 **             sendq -- a pointer to the head of a queue to put
 **                     these people into.
 **             e -- the envelope in which to add these recipients.
 **             sendq -- a pointer to the head of a queue to put
 **                     these people into.
 **             e -- the envelope in which to add these recipients.

-**             qflags -- special flags to set in the q_flags field.

 **
 **     Returns:
 **
 **     Returns:

-**             pointer to chain of addresses.
+**             The number of addresses actually on the list.

 **
 **     Side Effects:
 **             none.
 **
 **     Side Effects:
 **             none.


@@ -45,13 +64,11 @@ static char sccsid[] = "@(#)recipient.c     8.8 (Berkeley) %G%";
 
 # define MAXRCRSN      10
 
 
 # define MAXRCRSN      10
 

-ADDRESS *
-sendto(list, copyf, ctladdr, qflags)
+sendtolist(list, ctladdr, sendq, e)

        char *list;
        ADDRESS *ctladdr;
        ADDRESS **sendq;
        register ENVELOPE *e;
        char *list;
        ADDRESS *ctladdr;
        ADDRESS **sendq;
        register ENVELOPE *e;

-       u_short qflags;

 {
        register char *p;
        register ADDRESS *al;   /* list of addresses to send to */
 {
        register char *p;
        register ADDRESS *al;   /* list of addresses to send to */


@@ -59,8 +76,12 @@ sendto(list, copyf, ctladdr, qflags)
        char delimiter;         /* the address delimiter */
        int naddrs;
        char *oldto = e->e_to;
        char delimiter;         /* the address delimiter */
        int naddrs;
        char *oldto = e->e_to;

-       ADDRESS *sibl;          /* sibling pointer in tree */
-       ADDRESS *prev;          /* previous sibling */
+
+       if (list == NULL)
+       {
+               syserr("sendtolist: null list");
+               return 0;
+       }

 
        if (tTd(25, 1))
        {
 
        if (tTd(25, 1))
        {


@@ -89,15 +110,12 @@ sendto(list, copyf, ctladdr, qflags)
                /* parse the address */
                while ((isascii(*p) && isspace(*p)) || *p == ',')
                        p++;
                /* parse the address */
                while ((isascii(*p) && isspace(*p)) || *p == ',')
                        p++;

-               a = parseaddr(p, (ADDRESS *) NULL, 1, delimiter, &delimptr, e);
+               a = parseaddr(p, NULLADDR, RF_COPYALL, delimiter, &delimptr, e);

                p = delimptr;
                if (a == NULL)
                        continue;
                a->q_next = al;
                a->q_alias = ctladdr;
                p = delimptr;
                if (a == NULL)
                        continue;
                a->q_next = al;
                a->q_alias = ctladdr;

-               if (ctladdr != NULL)
-                       a->q_flags |= ctladdr->q_flags & ~QPRIMARY;
-               a->q_flags |= qflags;

 
                /* see if this should be marked as a primary address */
                if (ctladdr == NULL ||
 
                /* see if this should be marked as a primary address */
                if (ctladdr == NULL ||


@@ -111,72 +129,21 @@ sendto(list, copyf, ctladdr, qflags)
        }
 
        /* arrange to send to everyone on the local send list */
        }
 
        /* arrange to send to everyone on the local send list */

-       prev = sibl = NULL;
-       if (ctladdr != NULL)
-               prev = ctladdr->q_child;

        while (al != NULL)
        {
                register ADDRESS *a = al;
        while (al != NULL)
        {
                register ADDRESS *a = al;

-               extern ADDRESS *recipient();

 
                al = a->q_next;
 
                al = a->q_next;

-               sibl = recipient(a);
-               if (sibl != NULL)
-               {
-                       extern ADDRESS *addrref();
-
-                       /* inherit full name */
-                       if (sibl->q_fullname == NULL && ctladdr != NULL)
-                               sibl->q_fullname = ctladdr->q_fullname;
+               a = recipient(a, sendq, e);

 
 

-                       /* link tree together (but only if the node is new) */
-                       if (sibl == a)
-                       {
-                               sibl->q_sibling = prev;
-                               prev = sibl;
-                       }
-               }
+               /* arrange to inherit full name */
+               if (a->q_fullname == NULL && ctladdr != NULL)
+                       a->q_fullname = ctladdr->q_fullname;
+               naddrs++;

        }
 
        e->e_to = oldto;
        return (naddrs);
        }
 
        e->e_to = oldto;
        return (naddrs);

-       if (ctladdr != NULL)
-               ctladdr->q_child = prev;
-       return (prev);
-}
-\f/*
-**  ADDRREF -- return pointer to address that references another address.
-**
-**     Parameters:
-**             a -- address to check.
-**             r -- reference to find.
-**
-**     Returns:
-**             address of node in tree rooted at 'a' that references
-**                     'r'.
-**             NULL if no such node exists.
-**
-**     Side Effects:
-**             none.
-*/
-
-ADDRESS *
-addrref(a, r)
-       register ADDRESS *a;
-       register ADDRESS *r;
-{
-       register ADDRESS *q;
-
-       while (a != NULL)
-       {
-               if (a->q_child == r || a->q_sibling == r)
-                       return (a);
-               q = addrref(a->q_child, r);
-               if (q != NULL)
-                       return (q);
-               a = a->q_sibling;
-       }
-       return (NULL);

 }
 \f/*
 **  RECIPIENT -- Designate a message recipient
 }
 \f/*
 **  RECIPIENT -- Designate a message recipient


@@ -191,13 +158,13 @@ addrref(a, r)
 **             e -- the current envelope.
 **
 **     Returns:
 **             e -- the current envelope.
 **
 **     Returns:

-**             pointer to address actually inserted in send list.
+**             The actual address in the queue.  This will be "a" if
+**             the address is not a duplicate, else the original address.

 **
 **     Side Effects:
 **             none.
 */
 
 **
 **     Side Effects:
 **             none.
 */
 

-ADDRESS *

 ADDRESS *
 recipient(a, sendq, e)
        register ADDRESS *a;
 ADDRESS *
 recipient(a, sendq, e)
        register ADDRESS *a;


@@ -222,11 +189,20 @@ recipient(a, sendq, e)
                printaddr(a, FALSE);
        }
 
                printaddr(a, FALSE);
        }
 

+       /* if this is primary, add it to the original recipient list */
+       if (a->q_alias == NULL)
+       {
+               if (e->e_origrcpt == NULL)
+                       e->e_origrcpt = a->q_paddr;
+               else if (e->e_origrcpt != a->q_paddr)
+                       e->e_origrcpt = "";
+       }
+

        /* break aliasing loops */
        if (AliasLevel > MAXRCRSN)
        {
                usrerr("554 aliasing/forwarding loop broken");
        /* break aliasing loops */
        if (AliasLevel > MAXRCRSN)
        {
                usrerr("554 aliasing/forwarding loop broken");

-               return (NULL);
+               return (a);

        }
 
        /*
        }
 
        /*


@@ -246,11 +222,25 @@ recipient(a, sendq, e)
        stripquotes(buf);
 
        /* check for direct mailing to restricted mailers */
        stripquotes(buf);
 
        /* check for direct mailing to restricted mailers */

-       if (a->q_alias == NULL && m == ProgMailer &&
-           !bitset(EF_QUEUERUN, e->e_flags))
+       if (m == ProgMailer)

        {
        {

-               a->q_flags |= QBADADDR;
-               usrerr("550 Cannot mail directly to programs");
+               if (a->q_alias == NULL)
+               {
+                       a->q_flags |= QBADADDR;
+                       usrerr("550 Cannot mail directly to programs");
+               }
+               else if (bitset(QBOGUSSHELL, a->q_alias->q_flags))
+               {
+                       a->q_flags |= QBADADDR;
+                       usrerr("550 User %s@%s doesn't have a valid shell for mailing to programs",
+                               a->q_alias->q_ruser, MyHostName);
+               }
+               else if (bitset(QUNSAFEADDR, a->q_alias->q_flags))
+               {
+                       a->q_flags |= QBADADDR;
+                       usrerr("550 Address %s is unsafe for mailing to programs",
+                               a->q_alias->q_paddr);
+               }

        }
 
        /*
        }
 
        /*


@@ -266,10 +256,6 @@ recipient(a, sendq, e)
        {
                if (sameaddr(q, a))
                {
        {
                if (sameaddr(q, a))
                {

-                       /* if this is a reinsertion, just go ahead */
-                       if (bitset(QVERIFIED, q->q_flags))
-                               break;
-

                        if (tTd(26, 1))
                        {
                                printf("%s in sendq: ", a->q_paddr);
                        if (tTd(26, 1))
                        {
                                printf("%s in sendq: ", a->q_paddr);


@@ -281,20 +267,16 @@ recipient(a, sendq, e)
                                        message("duplicate suppressed");
                                q->q_flags |= a->q_flags;
                        }
                                        message("duplicate suppressed");
                                q->q_flags |= a->q_flags;
                        }

-                       if (!bitset(QPSEUDO, a->q_flags))
-                               q->q_flags &= ~QPSEUDO;
-                       return (q);
+                       else if (bitset(QSELFREF, q->q_flags))
+                               q->q_flags |= a->q_flags & ~QDONTSEND;
+                       a = q;
+                       goto testselfdestruct;

                }
        }
 
        /* add address on list */
                }
        }
 
        /* add address on list */

-       if (*pq != a)
-       {
-               *pq = a;
-               a->q_next = NULL;
-       }
-
-       a->q_flags &= ~QVERIFIED;
+       *pq = a;
+       a->q_next = NULL;

 
        /*
        **  Alias the name and handle special mailer types.
 
        /*
        **  Alias the name and handle special mailer types.


@@ -310,7 +292,7 @@ recipient(a, sendq, e)
        if (m == InclMailer)
        {
                a->q_flags |= QDONTSEND;
        if (m == InclMailer)
        {
                a->q_flags |= QDONTSEND;

-               if (a->q_alias == NULL && !bitset(EF_QUEUERUN, e->e_flags))
+               if (a->q_alias == NULL)

                {
                        a->q_flags |= QBADADDR;
                        usrerr("550 Cannot mail directly to :include:s");
                {
                        a->q_flags |= QBADADDR;
                        usrerr("550 Cannot mail directly to :include:s");


@@ -325,10 +307,12 @@ recipient(a, sendq, e)
                        {
 #ifdef LOG
                                if (LogLevel > 2)
                        {
 #ifdef LOG
                                if (LogLevel > 2)

-                                       syslog(LOG_ERR, "%s: include %s: transient error: %e",
-                                               e->e_id, a->q_user, errstring(ret));
+                                       syslog(LOG_ERR, "%s: include %s: transient error: %s",
+                                               e->e_id == NULL ? "NOQUEUE" : e->e_id,
+                                               a->q_user, errstring(ret));

 #endif
                                a->q_flags |= QQUEUEUP;
 #endif
                                a->q_flags |= QQUEUEUP;

+                               a->q_flags &= ~QDONTSEND;

                                usrerr("451 Cannot open %s: %s",
                                        a->q_user, errstring(ret));
                        }
                                usrerr("451 Cannot open %s: %s",
                                        a->q_user, errstring(ret));
                        }


@@ -342,21 +326,30 @@ recipient(a, sendq, e)
        }
        else if (m == FileMailer)
        {
        }
        else if (m == FileMailer)
        {

-               struct stat stb;

                extern bool writable();
 
                extern bool writable();
 

-               p = strrchr(buf, '/');

                /* check if writable or creatable */
                /* check if writable or creatable */

-               if (a->q_alias == NULL && !bitset(EF_QUEUERUN, e->e_flags))
+               if (a->q_alias == NULL)

                {
                        a->q_flags |= QBADADDR;
                        usrerr("550 Cannot mail directly to files");
                }
                {
                        a->q_flags |= QBADADDR;
                        usrerr("550 Cannot mail directly to files");
                }

-               else if ((stat(buf, &stb) >= 0) ? (!writable(&stb)) :
-                   (*p = '\0', safefile(buf, RealUid, TRUE, S_IWRITE|S_IEXEC) != 0))
+               else if (bitset(QBOGUSSHELL, a->q_alias->q_flags))

                {
                        a->q_flags |= QBADADDR;
                {
                        a->q_flags |= QBADADDR;

-                       giveresponse(EX_CANTCREAT, m, NULL, e);
+                       usrerr("550 User %s@%s doesn't have a valid shell for mailing to files",
+                               a->q_alias->q_ruser, MyHostName);
+               }
+               else if (bitset(QUNSAFEADDR, a->q_alias->q_flags))
+               {
+                       a->q_flags |= QBADADDR;
+                       usrerr("550 Address %s is unsafe for mailing to files",
+                               a->q_alias->q_paddr);
+               }
+               else if (!writable(buf, getctladdr(a), SFF_ANYFILE))
+               {
+                       a->q_flags |= QBADADDR;
+                       giveresponse(EX_CANTCREAT, m, NULL, a->q_alias, e);

                }
        }
 
                }
        }
 


@@ -375,7 +368,6 @@ recipient(a, sendq, e)
        if (!bitset(QDONTSEND|QNOTREMOTE|QVERIFIED, a->q_flags))
        {
                extern int udbexpand();
        if (!bitset(QDONTSEND|QNOTREMOTE|QVERIFIED, a->q_flags))
        {
                extern int udbexpand();

-               extern int errno;

 
                if (udbexpand(a, sendq, e) == EX_TEMPFAIL)
                {
 
                if (udbexpand(a, sendq, e) == EX_TEMPFAIL)
                {


@@ -385,7 +377,8 @@ recipient(a, sendq, e)
 # ifdef LOG
                        if (LogLevel > 8)
                                syslog(LOG_INFO, "%s: deferred: udbexpand: %s",
 # ifdef LOG
                        if (LogLevel > 8)
                                syslog(LOG_INFO, "%s: deferred: udbexpand: %s",

-                                       e->e_id, errstring(errno));
+                                       e->e_id == NULL ? "NOQUEUE" : e->e_id,
+                                       errstring(errno));

 # endif
                        message("queued (user database error): %s",
                                errstring(errno));
 # endif
                        message("queued (user database error): %s",
                                errstring(errno));


@@ -434,7 +427,7 @@ recipient(a, sendq, e)
                if (pw == NULL)
                {
                        a->q_flags |= QBADADDR;
                if (pw == NULL)
                {
                        a->q_flags |= QBADADDR;

-                       giveresponse(EX_NOUSER, m, NULL, e);
+                       giveresponse(EX_NOUSER, m, NULL, a->q_alias, e);

                }
                else
                {
                }
                else
                {


@@ -456,7 +449,10 @@ recipient(a, sendq, e)
                                (void) strcpy(buf, pw->pw_name);
                                goto trylocaluser;
                        }
                                (void) strcpy(buf, pw->pw_name);
                                goto trylocaluser;
                        }

-                       a->q_home = newstr(pw->pw_dir);
+                       if (strcmp(pw->pw_dir, "/") == 0)
+                               a->q_home = "";
+                       else
+                               a->q_home = newstr(pw->pw_dir);

                        a->q_uid = pw->pw_uid;
                        a->q_gid = pw->pw_gid;
                        a->q_ruser = newstr(pw->pw_name);
                        a->q_uid = pw->pw_uid;
                        a->q_gid = pw->pw_gid;
                        a->q_ruser = newstr(pw->pw_name);


@@ -464,6 +460,11 @@ recipient(a, sendq, e)
                        buildfname(pw->pw_gecos, pw->pw_name, nbuf);
                        if (nbuf[0] != '\0')
                                a->q_fullname = newstr(nbuf);
                        buildfname(pw->pw_gecos, pw->pw_name, nbuf);
                        if (nbuf[0] != '\0')
                                a->q_fullname = newstr(nbuf);

+                       if (pw->pw_shell != NULL && pw->pw_shell[0] != '\0' &&
+                           !usershellok(pw->pw_shell))
+                       {
+                               a->q_flags |= QBOGUSSHELL;
+                       }

                        if (!quoted)
                                forward(a, sendq, e);
                }
                        if (!quoted)
                                forward(a, sendq, e);
                }


@@ -472,20 +473,24 @@ recipient(a, sendq, e)
                e->e_nrcpts++;
 
   testselfdestruct:
                e->e_nrcpts++;
 
   testselfdestruct:

-       if (a->q_alias == NULL && a != &e->e_from)
+       if (tTd(26, 8))
+       {
+               printf("testselfdestruct: ");
+               printaddr(a, TRUE);
+       }
+       if (a->q_alias == NULL && a != &e->e_from &&
+           bitset(QDONTSEND, a->q_flags))

        {
        {

-               q = a->q_next;
-               while (q != NULL && bitset(QDONTSEND|QBADADDR, q->q_flags))
+               q = *sendq;
+               while (q != NULL && bitset(QDONTSEND, q->q_flags))

                        q = q->q_next;
                        q = q->q_next;

-               if (bitset(QDONTSEND, a->q_flags) && q == NULL)
+               if (q == NULL)

                {
                        a->q_flags |= QBADADDR;
                        usrerr("554 aliasing/forwarding loop broken");
                }
        }
        return (a);
                {
                        a->q_flags |= QBADADDR;
                        usrerr("554 aliasing/forwarding loop broken");
                }
        }
        return (a);

-
-       return (a);

 }
 \f/*
 **  FINDUSER -- find the password entry for a user.
 }
 \f/*
 **  FINDUSER -- find the password entry for a user.


@@ -525,6 +530,17 @@ finduser(name, fuzzyp)
 
        *fuzzyp = FALSE;
 
 
        *fuzzyp = FALSE;
 

+       /* DEC Hesiod getpwnam accepts numeric strings -- short circuit it */
+       for (p = name; *p != '\0'; p++)
+               if (!isascii(*p) || !isdigit(*p))
+                       break;
+       if (*p == '\0')
+       {
+               if (tTd(29, 4))
+                       printf("failed (numeric input)\n");
+               return NULL;
+       }
+

        /* look up this login name using fast path */
        if ((pw = getpwnam(name)) != NULL)
        {
        /* look up this login name using fast path */
        if ((pw = getpwnam(name)) != NULL)
        {


@@ -553,13 +569,13 @@ finduser(name, fuzzyp)
        {
                char buf[MAXNAME];
 
        {
                char buf[MAXNAME];
 

-               fullname(pw, buf);
+               buildfname(pw->pw_gecos, pw->pw_name, buf);

                if (strchr(buf, ' ') != NULL && !strcasecmp(buf, name))
                {
                        if (tTd(29, 4))
                                printf("fuzzy matches %s\n", pw->pw_name);
                if (strchr(buf, ' ') != NULL && !strcasecmp(buf, name))
                {
                        if (tTd(29, 4))
                                printf("fuzzy matches %s\n", pw->pw_name);

-                               message(Arpa_Info, "sending to %s <%s>",
-                                   buf, pw->pw_name);
+                       message("sending to login name %s", pw->pw_name);
+                       *fuzzyp = TRUE;

                        return (pw);
                }
        }
                        return (pw);
                }
        }


@@ -583,7 +599,9 @@ finduser(name, fuzzyp)
 **     not writable.  This is also enforced by mailfile.
 **
 **     Parameters:
 **     not writable.  This is also enforced by mailfile.
 **
 **     Parameters:

-**             s -- pointer to a stat struct for the file.
+**             filename -- the file name to check.
+**             ctladdr -- the controlling address for this file.
+**             flags -- SFF_* flags to control the function.

 **
 **     Returns:
 **             TRUE -- if we will be able to write this file.
 **
 **     Returns:
 **             TRUE -- if we will be able to write this file.


@@ -594,35 +612,98 @@ finduser(name, fuzzyp)
 */
 
 bool
 */
 
 bool

-writable(s)
-       register struct stat *s;
+writable(filename, ctladdr, flags)
+       char *filename;
+       ADDRESS *ctladdr;
+       int flags;

 {
        uid_t euid;
        gid_t egid;
        int bits;
 {
        uid_t euid;
        gid_t egid;
        int bits;

+       register char *p;
+       char *uname;
+       struct stat stb;
+       extern char RealUserName[];

 
 

-       if (bitset(0111, s->st_mode))
-               return (FALSE);
-       euid = RealUid;
-       egid = RealGid;
-       if (geteuid() == 0)
+       if (tTd(29, 5))
+               printf("writable(%s, %x)\n", filename, flags);
+
+#ifdef HASLSTAT
+       if ((bitset(SFF_NOSLINK, flags) ? lstat(filename, &stb)
+                                       : stat(filename, &stb)) < 0)
+#else
+       if (stat(filename, &stb) < 0)
+#endif

        {
        {

-               if (bitset(S_ISUID, s->st_mode))
-                       euid = s->st_uid;
-               if (bitset(S_ISGID, s->st_mode))
-                       egid = s->st_gid;
+               /* file does not exist -- see if directory is safe */
+               p = strrchr(filename, '/');
+               if (p == NULL)
+               {
+                       errno = ENOTDIR;
+                       return FALSE;
+               }
+               *p = '\0';
+               errno = safefile(filename, RealUid, RealGid, RealUserName,
+                                SFF_MUSTOWN, S_IWRITE|S_IEXEC);
+               *p = '/';
+               return errno == 0;

        }
 
        }
 

+#ifdef SUID_ROOT_FILES_OK
+       /* really ought to be passed down -- and not a good idea */
+       flags |= SFF_ROOTOK;
+#endif
+
+       /*
+       **  File does exist -- check that it is writable.
+       */
+
+       if (bitset(0111, stb.st_mode))
+       {
+               if (tTd(29, 5))
+                       printf("failed (mode %o: x bits)\n", stb.st_mode);
+               errno = EPERM;
+               return (FALSE);
+       }
+
+       if (ctladdr != NULL && geteuid() == 0)
+       {
+               euid = ctladdr->q_uid;
+               egid = ctladdr->q_gid;
+               uname = ctladdr->q_user;
+       }
+       else
+       {
+               euid = RealUid;
+               egid = RealGid;
+               uname = RealUserName;
+       }

        if (euid == 0)
        if (euid == 0)

-               return (TRUE);
-       bits = S_IWRITE;
-       if (euid != s->st_uid)

        {
        {

-               bits >>= 3;
-               if (egid != s->st_gid)
-                       bits >>= 3;
+               euid = DefUid;
+               uname = DefUser;

        }
        }

-       return ((s->st_mode & bits) != 0);
+       if (egid == 0)
+               egid = DefGid;
+       if (geteuid() == 0)
+       {
+               if (bitset(S_ISUID, stb.st_mode) &&
+                   (stb.st_uid != 0 || bitset(SFF_ROOTOK, flags)))
+               {
+                       euid = stb.st_uid;
+                       uname = NULL;
+               }
+               if (bitset(S_ISGID, stb.st_mode) &&
+                   (stb.st_gid != 0 || bitset(SFF_ROOTOK, flags)))
+                       egid = stb.st_gid;
+       }
+
+       if (tTd(29, 5))
+               printf("\teu/gid=%d/%d, st_u/gid=%d/%d\n",
+                       euid, egid, stb.st_uid, stb.st_gid);
+
+       errno = safefile(filename, euid, egid, uname, flags, S_IWRITE);
+       return errno == 0;

 }
 \f/*
 **  INCLUDE -- handle :include: specification.
 }
 \f/*
 **  INCLUDE -- handle :include: specification.


@@ -643,11 +724,28 @@ writable(s)
 **     Side Effects:
 **             reads the :include: file and sends to everyone
 **             listed in that file.
 **     Side Effects:
 **             reads the :include: file and sends to everyone
 **             listed in that file.

+**
+**     Security Note:
+**             If you have restricted chown (that is, you can't
+**             give a file away), it is reasonable to allow programs
+**             and files called from this :include: file to be to be
+**             run as the owner of the :include: file.  This is bogus
+**             if there is any chance of someone giving away a file.
+**             We assume that pre-POSIX systems can give away files.
+**
+**             There is an additional restriction that if you
+**             forward to a :include: file, it will not take on
+**             the ownership of the :include: file.  This may not
+**             be necessary, but shouldn't hurt.

 */
 
 static jmp_buf CtxIncludeTimeout;
 static int     includetimeout();
 
 */
 
 static jmp_buf CtxIncludeTimeout;
 static int     includetimeout();
 

+#ifndef S_IWOTH
+# define S_IWOTH       (S_IWRITE >> 6)
+#endif
+

 int
 include(fname, forwarding, ctladdr, sendq, e)
        char *fname;
 int
 include(fname, forwarding, ctladdr, sendq, e)
        char *fname;


@@ -656,16 +754,38 @@ include(fname, forwarding, ctladdr, sendq, e)
        ADDRESS **sendq;
        ENVELOPE *e;
 {
        ADDRESS **sendq;
        ENVELOPE *e;
 {

-       register FILE *fp;
+       register FILE *fp = NULL;

        char *oldto = e->e_to;
        char *oldfilename = FileName;
        int oldlinenumber = LineNumber;
        register EVENT *ev = NULL;
        int nincludes;
        char *oldto = e->e_to;
        char *oldfilename = FileName;
        int oldlinenumber = LineNumber;
        register EVENT *ev = NULL;
        int nincludes;

-       int ret;
-       ADDRESS *ca;
-       uid_t uid;
+       register ADDRESS *ca;
+       uid_t saveduid, uid;
+       gid_t savedgid, gid;
+       char *uname;
+       int rval = 0;
+       int sfflags = forwarding ? SFF_MUSTOWN : SFF_ANYFILE;
+       struct stat st;

        char buf[MAXLINE];
        char buf[MAXLINE];

+#ifdef _POSIX_CHOWN_RESTRICTED
+# if _POSIX_CHOWN_RESTRICTED == -1
+#  define safechown    FALSE
+# else
+#  define safechown    TRUE
+# endif
+#else
+# ifdef _PC_CHOWN_RESTRICTED
+       bool safechown;
+# else
+#  ifdef BSD
+#   define safechown   TRUE
+#  else
+#   define safechown   FALSE
+#  endif
+# endif
+#endif
+       extern bool chownsafe();

 
        if (tTd(27, 2))
                printf("include(%s)\n", fname);
 
        if (tTd(27, 2))
                printf("include(%s)\n", fname);


@@ -677,66 +797,141 @@ include(fname, forwarding, ctladdr, sendq, e)
                printaddr(ctladdr, FALSE);
        }
 
                printaddr(ctladdr, FALSE);
        }
 

-       /*
-       **  If home directory is remote mounted but server is down,
-       **  this can hang or give errors; use a timeout to avoid this
-       */
+       if (tTd(27, 9))
+               printf("include: old uid = %d/%d\n", getuid(), geteuid());

 
        ca = getctladdr(ctladdr);
        if (ca == NULL)
 
        ca = getctladdr(ctladdr);
        if (ca == NULL)

-               uid = 0;
+       {
+               uid = DefUid;
+               gid = DefGid;
+               uname = DefUser;
+               saveduid = -1;
+       }

        else
        else

+       {

                uid = ca->q_uid;
                uid = ca->q_uid;

+               gid = ca->q_gid;
+               uname = ca->q_user;
+#ifdef HASSETREUID
+               saveduid = geteuid();
+               savedgid = getegid();
+               if (saveduid == 0)
+               {
+                       initgroups(uname, gid);
+                       if (uid != 0)
+                               (void) setreuid(0, uid);
+               }
+#endif                   
+       }
+
+       if (tTd(27, 9))
+               printf("include: new uid = %d/%d\n", getuid(), geteuid());
+
+       /*
+       **  If home directory is remote mounted but server is down,
+       **  this can hang or give errors; use a timeout to avoid this
+       */

 
        if (setjmp(CtxIncludeTimeout) != 0)
        {
                ctladdr->q_flags |= QQUEUEUP;
                errno = 0;
 
        if (setjmp(CtxIncludeTimeout) != 0)
        {
                ctladdr->q_flags |= QQUEUEUP;
                errno = 0;

-               usrerr("451 open timeout on %s", fname);
-               return ETIMEDOUT;
+
+               /* return pseudo-error code */
+               rval = EOPENTIMEOUT;
+               goto resetuid;

        }
        ev = setevent((time_t) 60, includetimeout, 0);
 
        /* the input file must be marked safe */
        }
        ev = setevent((time_t) 60, includetimeout, 0);
 
        /* the input file must be marked safe */

-       if ((ret = safefile(fname, uid, forwarding, S_IREAD)) != 0)
+       rval = safefile(fname, uid, gid, uname, sfflags, S_IREAD);
+       if (rval != 0)

        {
        {

-               /* don't use this .forward file */
-               clrevent(ev);
+               /* don't use this :include: file */

                if (tTd(27, 4))
                        printf("include: not safe (uid=%d): %s\n",
                if (tTd(27, 4))
                        printf("include: not safe (uid=%d): %s\n",

-                               uid, errstring(ret));
-               return ret;
+                               uid, errstring(rval));

        }
        }

-
-       fp = fopen(fname, "r");
-       if (fp == NULL)
+       else

        {
        {

-               int ret = errno;
-
-               clrevent(ev);
-               if (tTd(27, 4))
-                       printf("include: open: %s\n", errstring(ret));
-               return ret;
+               fp = fopen(fname, "r");
+               if (fp == NULL)
+               {
+                       rval = errno;
+                       if (tTd(27, 4))
+                               printf("include: open: %s\n", errstring(rval));
+               }

        }
        }

+       clrevent(ev);

 
 

-       if (ca == NULL)
+resetuid:
+
+#ifdef HASSETREUID
+       if (saveduid == 0)

        {
        {

-               struct stat st;
+               if (uid != 0)
+                       if (setreuid(-1, 0) < 0 || setreuid(RealUid, 0) < 0)
+                               syserr("setreuid(%d, 0) failure (real=%d, eff=%d)",
+                                       RealUid, getuid(), geteuid());
+               setgid(savedgid);
+       }
+#endif

 
 

-               if (fstat(fileno(fp), &st) < 0)
-               {
-                       int ret = errno;
+       if (tTd(27, 9))
+               printf("include: reset uid = %d/%d\n", getuid(), geteuid());

 
 

-                       clrevent(ev);
-                       syserr("Cannot fstat %s!", fname);
-                       return ret;
-               }
+       if (rval == EOPENTIMEOUT)
+               usrerr("451 open timeout on %s", fname);
+
+       if (fp == NULL)
+               return rval;
+
+       if (fstat(fileno(fp), &st) < 0)
+       {
+               rval = errno;
+               syserr("Cannot fstat %s!", fname);
+               return rval;
+       }
+
+#ifndef safechown
+       safechown = chownsafe(fileno(fp));
+#endif
+       if (ca == NULL && safechown)
+       {

                ctladdr->q_uid = st.st_uid;
                ctladdr->q_gid = st.st_gid;
                ctladdr->q_flags |= QGOODUID;
        }
                ctladdr->q_uid = st.st_uid;
                ctladdr->q_gid = st.st_gid;
                ctladdr->q_flags |= QGOODUID;
        }

+       if (ca != NULL && ca->q_uid == st.st_uid)
+       {
+               /* optimization -- avoid getpwuid if we already have info */
+               ctladdr->q_flags |= ca->q_flags & QBOGUSSHELL;
+               ctladdr->q_ruser = ca->q_ruser;
+       }
+       else
+       {
+               char *sh;
+               register struct passwd *pw;

 
 

-       clrevent(ev);
+               sh = "/SENDMAIL/ANY/SHELL/";
+               pw = getpwuid(st.st_uid);
+               if (pw != NULL)
+               {
+                       ctladdr->q_ruser = newstr(pw->pw_name);
+                       if (safechown)
+                               sh = pw->pw_shell;
+               }
+               if (pw == NULL)
+                       ctladdr->q_flags |= QBOGUSSHELL;
+               else if(!usershellok(sh))
+               {
+                       if (safechown)
+                               ctladdr->q_flags |= QBOGUSSHELL;
+                       else
+                               ctladdr->q_flags |= QUNSAFEADDR;
+               }
+       }

 
        if (bitset(EF_VRFYONLY, e->e_flags))
        {
 
        if (bitset(EF_VRFYONLY, e->e_flags))
        {


@@ -744,9 +939,22 @@ include(fname, forwarding, ctladdr, sendq, e)
                ctladdr->q_flags |= QVERIFIED;
                e->e_nrcpts++;
                xfclose(fp, "include", fname);
                ctladdr->q_flags |= QVERIFIED;
                e->e_nrcpts++;
                xfclose(fp, "include", fname);

-               return 0;
+               return rval;

        }
 
        }
 

+       /*
+       ** Check to see if some bad guy can write this file
+       **
+       **      This should really do something clever with group
+       **      permissions; currently we just view world writable
+       **      as unsafe.  Also, we don't check for writable
+       **      directories in the path.  We've got to leave
+       **      something for the local sysad to do.
+       */
+
+       if (bitset(S_IWOTH, st.st_mode))
+               ctladdr->q_flags |= QUNSAFEADDR;
+

        /* read the file -- each line is a comma-separated list. */
        FileName = fname;
        LineNumber = 0;
        /* read the file -- each line is a comma-separated list. */
        FileName = fname;
        LineNumber = 0;


@@ -767,11 +975,12 @@ include(fname, forwarding, ctladdr, sendq, e)
 #ifdef LOG
                if (forwarding && LogLevel > 9)
                        syslog(LOG_INFO, "%s: forward %s => %s",
 #ifdef LOG
                if (forwarding && LogLevel > 9)
                        syslog(LOG_INFO, "%s: forward %s => %s",

-                               e->e_id, oldto, buf);
+                               e->e_id == NULL ? "NOQUEUE" : e->e_id,
+                               oldto, buf);

 #endif
 
                AliasLevel++;
 #endif
 
                AliasLevel++;

-               sendto(buf, 1, ctladdr, 0);
+               nincludes += sendtolist(buf, ctladdr, sendq, e);

                AliasLevel--;
        }
 
                AliasLevel--;
        }
 


@@ -791,7 +1000,7 @@ include(fname, forwarding, ctladdr, sendq, e)
        FileName = oldfilename;
        LineNumber = oldlinenumber;
        e->e_to = oldto;
        FileName = oldfilename;
        LineNumber = oldlinenumber;
        e->e_to = oldto;

-       return 0;
+       return rval;

 }
 
 static
 }
 
 static


@@ -822,7 +1031,7 @@ sendtoargv(argv, e)
 
        while ((p = *argv++) != NULL)
        {
 
        while ((p = *argv++) != NULL)
        {

-               sendto(p, 0, (ADDRESS *) NULL, 0);
+               (void) sendtolist(p, NULLADDR, &e->e_sendqueue, e);

        }
 }
 \f/*
        }
 }
 \f/*