549 lines
13 KiB
C
549 lines
13 KiB
C
/*-
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* Copyright (c) 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: mail.local.c,v 1.15 1997/12/24 19:38:18 imp Exp $
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1990, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)mail.local.c 8.6 (Berkeley) 4/8/94";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <syslog.h>
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#include <time.h>
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#include <unistd.h>
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#if __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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#include "pathnames.h"
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int eval = EX_OK; /* sysexits.h error value. */
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void deliver __P((int, char *, int));
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void e_to_sys __P((int));
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void err __P((const char *, ...)) __dead2;
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void notifybiff __P((char *));
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int store __P((char *));
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void usage __P((void));
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void vwarn __P((const char *, _BSD_VA_LIST_));
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void warn __P((const char *, ...));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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struct passwd *pw;
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int ch, fd, nobiff;
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uid_t uid;
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char *from;
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openlog("mail.local", 0, LOG_MAIL);
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from = NULL;
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nobiff = 0;
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while ((ch = getopt(argc, argv, "bdf:r:")) != -1)
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switch(ch) {
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case 'b':
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nobiff++;
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break;
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case 'd': /* Backward compatible. */
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break;
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case 'f':
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case 'r': /* Backward compatible. */
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if (from != NULL) {
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warn("multiple -f options");
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usage();
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}
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from = optarg;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (!*argv)
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usage();
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/*
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* If from not specified, use the name from getlogin() if the
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* uid matches, otherwise, use the name from the password file
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* corresponding to the uid.
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*/
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uid = getuid();
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if (!from && (!(from = getlogin()) ||
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!(pw = getpwnam(from)) || pw->pw_uid != uid))
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from = (pw = getpwuid(uid)) ? pw->pw_name : "???";
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/*
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* There is no way to distinguish the error status of one delivery
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* from the rest of the deliveries. So, if we failed hard on one
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* or more deliveries, but had no failures on any of the others, we
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* return a hard failure. If we failed temporarily on one or more
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* deliveries, we return a temporary failure regardless of the other
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* failures. This results in the delivery being reattempted later
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* at the expense of repeated failures and multiple deliveries.
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*/
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for (fd = store(from); *argv; ++argv)
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deliver(fd, *argv, nobiff);
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exit(eval);
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}
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int
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store(from)
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char *from;
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{
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FILE *fp;
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time_t tval;
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int fd, eline;
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char *tn, line[2048];
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tn = strdup(_PATH_LOCTMP);
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if ((fd = mkstemp(tn)) == -1 || (fp = fdopen(fd, "w+")) == NULL) {
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e_to_sys(errno);
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err("unable to open temporary file");
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}
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(void)unlink(tn);
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free(tn);
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(void)time(&tval);
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(void)fprintf(fp, "From %s %s", from, ctime(&tval));
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line[0] = '\0';
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for (eline = 1; fgets(line, sizeof(line), stdin);) {
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if (line[0] == '\n')
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eline = 1;
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else {
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if (eline && line[0] == 'F' &&
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!memcmp(line, "From ", 5))
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(void)putc('>', fp);
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eline = 0;
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}
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(void)fprintf(fp, "%s", line);
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if (ferror(fp)) {
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e_to_sys(errno);
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err("temporary file write error");
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}
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}
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/* If message not newline terminated, need an extra. */
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if (!strchr(line, '\n'))
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(void)putc('\n', fp);
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/* Output a newline; note, empty messages are allowed. */
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(void)putc('\n', fp);
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if (fflush(fp) == EOF || ferror(fp)) {
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e_to_sys(errno);
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err("temporary file write error");
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}
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return (fd);
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}
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void
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deliver(fd, name, nobiff)
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int fd, nobiff;
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char *name;
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{
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struct stat fsb, sb;
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struct passwd *pw;
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int mbfd, nr, nw, off;
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char biffmsg[100], buf[8*1024], path[MAXPATHLEN];
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off_t curoff;
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uid_t saveeuid;
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/*
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* Disallow delivery to unknown names -- special mailboxes can be
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* handled in the sendmail aliases file.
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*/
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if (!(pw = getpwnam(name))) {
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if (eval != EX_TEMPFAIL)
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eval = EX_UNAVAILABLE;
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warn("unknown name: %s", name);
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return;
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}
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(void)snprintf(path, sizeof(path), "%s/%s", _PATH_MAILDIR, name);
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/*
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* If the mailbox is linked or a symlink, fail. There's an obvious
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* race here, that the file was replaced with a symbolic link after
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* the lstat returned, but before the open. We attempt to detect
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* this by comparing the original stat information and information
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* returned by an fstat of the file descriptor returned by the open.
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*
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* NB: this is a symptom of a larger problem, that the mail spooling
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* directory is writeable by the wrong users. If that directory is
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* writeable, system security is compromised for other reasons, and
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* it cannot be fixed here.
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*
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* If we created the mailbox, set the owner/group. If that fails,
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* just return. Another process may have already opened it, so we
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* can't unlink it. Historically, binmail set the owner/group at
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* each mail delivery. We no longer do this, assuming that if the
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* ownership or permissions were changed there was a reason.
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*
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* XXX
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* open(2) should support flock'ing the file.
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*/
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saveeuid=geteuid();
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tryagain:
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if (lstat(path, &sb)) {
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mbfd = open(path,
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O_APPEND|O_CREAT|O_EXCL|O_WRONLY, S_IRUSR|S_IWUSR);
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if (mbfd == -1) {
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if (errno == EEXIST)
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goto tryagain;
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} else if (fchown(mbfd, pw->pw_uid, pw->pw_gid)) {
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e_to_sys(errno);
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warn("chown %u.%u: %s", pw->pw_uid, pw->pw_gid, name);
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return;
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}
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/*
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* Now that the box is created and permissions are correct, we
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* close it and go back to the top so that we will come in
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* and write as the user. We dont seteuid() before the above
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* open, because we have to be root/bin to write in var/mail
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* -Crh (henrich@msu.edu)
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*/
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close(mbfd);
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goto tryagain;
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} else if (sb.st_nlink != 1 || S_ISLNK(sb.st_mode)) {
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e_to_sys(errno);
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warn("%s: linked file", path);
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return;
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} else {
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/* Become the user, so quota enforcement will occur */
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if(seteuid(pw->pw_uid) != 0) {
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warn("Unable to seteuid()");
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return;
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}
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mbfd = open(path, O_APPEND|O_WRONLY, 0);
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if (mbfd != -1 &&
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(fstat(mbfd, &fsb) || fsb.st_nlink != 1 ||
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S_ISLNK(fsb.st_mode) || sb.st_dev != fsb.st_dev ||
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sb.st_ino != fsb.st_ino)) {
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warn("%s: file changed after open", path);
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(void)close(mbfd);
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seteuid(saveeuid);
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return;
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}
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}
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if (mbfd == -1) {
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e_to_sys(errno);
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warn("%s: %s", path, strerror(errno));
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seteuid(saveeuid);
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return;
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}
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/* Wait until we can get a lock on the file. */
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if (flock(mbfd, LOCK_EX)) {
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e_to_sys(errno);
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warn("%s: %s", path, strerror(errno));
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goto err1;
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}
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curoff = lseek(mbfd, (off_t)0, SEEK_END);
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if (!nobiff) {
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(void)snprintf(biffmsg, sizeof(biffmsg), "%s@%qd\n",
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name, curoff);
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}
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/* Copy the message into the file. */
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if (lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) {
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e_to_sys(errno);
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warn("temporary file: %s", strerror(errno));
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goto err1;
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}
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while ((nr = read(fd, buf, sizeof(buf))) > 0)
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for (off = 0; off < nr; nr -= nw, off += nw)
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if ((nw = write(mbfd, buf + off, nr)) < 0) {
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e_to_sys(errno);
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warn("%s: %s", path, strerror(errno));
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goto err2;
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}
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if (nr < 0) {
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e_to_sys(errno);
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warn("temporary file: %s", strerror(errno));
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err2: (void)ftruncate(mbfd, curoff);
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err1: (void)close(mbfd);
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seteuid(saveeuid);
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return;
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}
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#ifndef DONT_FSYNC
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/* Flush to disk, don't wait for update. */
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if (fsync(mbfd)) {
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e_to_sys(errno);
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warn("%s: %s", path, strerror(errno));
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goto err2;
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}
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#endif
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/* Close and check -- NFS doesn't write until the close. */
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if (close(mbfd)) {
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e_to_sys(errno);
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warn("%s: %s", path, strerror(errno));
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seteuid(saveeuid);
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return;
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}
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seteuid(saveeuid);
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if (!nobiff)
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notifybiff(biffmsg);
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}
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void
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notifybiff(msg)
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char *msg;
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{
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static struct sockaddr_in addr;
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static int f = -1;
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struct hostent *hp;
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struct servent *sp;
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int len;
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if (!addr.sin_family) {
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/* Be silent if biff service not available. */
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if (!(sp = getservbyname("biff", "udp")))
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return;
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if (!(hp = gethostbyname("localhost"))) {
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warn("localhost: %s", strerror(errno));
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return;
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}
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addr.sin_family = hp->h_addrtype;
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memmove(&addr.sin_addr, hp->h_addr,
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MIN(hp->h_length,sizeof(addr.sin_addr)));
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addr.sin_port = sp->s_port;
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}
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if (f < 0 && (f = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
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warn("socket: %s", strerror(errno));
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return;
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}
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len = strlen(msg) + 1;
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if (sendto(f, msg, len, 0, (struct sockaddr *)&addr, sizeof(addr))
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!= len)
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warn("sendto biff: %s", strerror(errno));
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}
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void
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usage()
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{
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eval = EX_USAGE;
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err("usage: mail.local [-b] [-f from] user ...");
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}
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#if __STDC__
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void
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err(const char *fmt, ...)
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#else
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void
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err(fmt, va_alist)
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const char *fmt;
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va_dcl
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#endif
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{
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va_list ap;
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#if __STDC__
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va_start(ap, fmt);
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#else
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va_start(ap);
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#endif
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vwarn(fmt, ap);
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va_end(ap);
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exit(eval);
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}
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void
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#if __STDC__
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warn(const char *fmt, ...)
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#else
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warn(fmt, va_alist)
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const char *fmt;
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va_dcl
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#endif
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{
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va_list ap;
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#if __STDC__
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va_start(ap, fmt);
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#else
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va_start(ap);
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#endif
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vwarn(fmt, ap);
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va_end(ap);
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}
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void
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vwarn(fmt, ap)
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const char *fmt;
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_BSD_VA_LIST_ ap;
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{
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/*
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* Log the message to stderr.
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*
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* Don't use LOG_PERROR as an openlog() flag to do this,
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* it's not portable enough.
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*/
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if (eval != EX_USAGE)
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(void)fprintf(stderr, "mail.local: ");
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(void)vfprintf(stderr, fmt, ap);
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(void)fprintf(stderr, "\n");
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/* Log the message to syslog. */
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vsyslog(LOG_ERR, fmt, ap);
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}
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/*
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* e_to_sys --
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* Guess which errno's are temporary. Gag me.
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*/
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void
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e_to_sys(num)
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int num;
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{
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/* Temporary failures override hard errors. */
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if (eval == EX_TEMPFAIL)
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return;
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switch(num) { /* Hopefully temporary errors. */
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#ifdef EAGAIN
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case EAGAIN: /* Resource temporarily unavailable */
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#endif
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#ifdef EDQUOT
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case EDQUOT: /* Disc quota exceeded */
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#endif
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#ifdef EBUSY
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case EBUSY: /* Device busy */
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#endif
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#ifdef EPROCLIM
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case EPROCLIM: /* Too many processes */
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#endif
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#ifdef EUSERS
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case EUSERS: /* Too many users */
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#endif
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#ifdef ECONNABORTED
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case ECONNABORTED: /* Software caused connection abort */
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#endif
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#ifdef ECONNREFUSED
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case ECONNREFUSED: /* Connection refused */
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#endif
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#ifdef ECONNRESET
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case ECONNRESET: /* Connection reset by peer */
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#endif
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#ifdef EDEADLK
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case EDEADLK: /* Resource deadlock avoided */
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#endif
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#ifdef EFBIG
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case EFBIG: /* File too large */
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#endif
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#ifdef EHOSTDOWN
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case EHOSTDOWN: /* Host is down */
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#endif
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#ifdef EHOSTUNREACH
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case EHOSTUNREACH: /* No route to host */
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#endif
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#ifdef EMFILE
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case EMFILE: /* Too many open files */
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#endif
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#ifdef ENETDOWN
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case ENETDOWN: /* Network is down */
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#endif
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#ifdef ENETRESET
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case ENETRESET: /* Network dropped connection on reset */
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#endif
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#ifdef ENETUNREACH
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case ENETUNREACH: /* Network is unreachable */
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#endif
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#ifdef ENFILE
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case ENFILE: /* Too many open files in system */
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#endif
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#ifdef ENOBUFS
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case ENOBUFS: /* No buffer space available */
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#endif
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#ifdef ENOMEM
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case ENOMEM: /* Cannot allocate memory */
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#endif
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#ifdef ENOSPC
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case ENOSPC: /* No space left on device */
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#endif
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#ifdef EROFS
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case EROFS: /* Read-only file system */
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#endif
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#ifdef ESTALE
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case ESTALE: /* Stale NFS file handle */
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#endif
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#ifdef ETIMEDOUT
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case ETIMEDOUT: /* Connection timed out */
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#endif
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#if defined(EWOULDBLOCK) && (EWOULDBLOCK != EAGAIN)
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|
case EWOULDBLOCK: /* Operation would block. */
|
|
#endif
|
|
eval = EX_TEMPFAIL;
|
|
break;
|
|
default:
|
|
eval = EX_UNAVAILABLE;
|
|
break;
|
|
}
|
|
}
|