161 lines
4.4 KiB
C
161 lines
4.4 KiB
C
/*
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* Copyright (c) 2010-2014, Simon Schubert <2@0x2c.org>.
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* Copyright (c) 2008 The DragonFly Project. All rights reserved.
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*
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* This code is derived from software contributed to The DragonFly Project
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* by Simon Schubert <2@0x2c.org>.
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name of The DragonFly Project nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific, prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* 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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/*
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* This binary is setuid root. Use extreme caution when touching
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* user-supplied information. Keep the root window as small as possible.
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*/
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <paths.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <syslog.h>
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#include <unistd.h>
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#include "dma.h"
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static void
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logfail(int exitcode, const char *fmt, ...)
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{
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int oerrno = errno;
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va_list ap;
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char outs[1024];
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outs[0] = 0;
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if (fmt != NULL) {
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va_start(ap, fmt);
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vsnprintf(outs, sizeof(outs), fmt, ap);
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va_end(ap);
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}
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errno = oerrno;
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if (*outs != 0)
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syslog(LOG_ERR, errno ? "%s: %m" : "%s", outs);
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else
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syslog(LOG_ERR, errno ? "%m" : "unknown error");
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exit(exitcode);
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}
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/*
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* Create a mbox in /var/mail for a given user, or make sure
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* the permissions are correct for dma.
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*/
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int
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main(int argc, char **argv)
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{
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const char *user;
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struct passwd *pw;
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struct group *gr;
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uid_t user_uid;
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gid_t mail_gid;
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int error;
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char fn[PATH_MAX+1];
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int f;
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openlog("dma-mbox-create", 0, LOG_MAIL);
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errno = 0;
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gr = getgrnam(DMA_GROUP);
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if (!gr)
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logfail(EX_CONFIG, "cannot find dma group `%s'", DMA_GROUP);
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mail_gid = gr->gr_gid;
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if (setgid(mail_gid) != 0)
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logfail(EX_NOPERM, "cannot set gid to %d (%s)", mail_gid, DMA_GROUP);
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if (getegid() != mail_gid)
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logfail(EX_NOPERM, "cannot set gid to %d (%s), still at %d", mail_gid, DMA_GROUP, getegid());
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/*
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* We take exactly one argument: the username.
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*/
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if (argc != 2) {
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errno = 0;
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logfail(EX_USAGE, "no arguments");
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}
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user = argv[1];
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syslog(LOG_NOTICE, "creating mbox for `%s'", user);
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/* the username may not contain a pathname separator */
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if (strchr(user, '/')) {
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errno = 0;
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logfail(EX_DATAERR, "path separator in username `%s'", user);
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exit(1);
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}
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/* verify the user exists */
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errno = 0;
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pw = getpwnam(user);
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if (!pw)
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logfail(EX_NOUSER, "cannot find user `%s'", user);
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user_uid = pw->pw_uid;
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error = snprintf(fn, sizeof(fn), "%s/%s", _PATH_MAILDIR, user);
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if (error < 0 || (size_t)error >= sizeof(fn)) {
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if (error >= 0) {
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errno = 0;
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logfail(EX_USAGE, "mbox path too long");
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}
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logfail(EX_CANTCREAT, "cannot build mbox path for `%s/%s'", _PATH_MAILDIR, user);
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}
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f = open(fn, O_RDONLY|O_CREAT, 0600);
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if (f < 0)
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logfail(EX_NOINPUT, "cannt open mbox `%s'", fn);
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if (fchown(f, user_uid, mail_gid))
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logfail(EX_OSERR, "cannot change owner of mbox `%s'", fn);
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if (fchmod(f, 0620))
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logfail(EX_OSERR, "cannot change permissions of mbox `%s'", fn);
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/* file should be present with the right owner and permissions */
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syslog(LOG_NOTICE, "successfully created mbox for `%s'", user);
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return (0);
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}
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