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git.ipfire.org Git - people/ms/dma.git/blob - dma-mbox-create.c
2 * Copyright (c) 2010-2014, Simon Schubert <2@0x2c.org>.
3 * Copyright (c) 2008 The DragonFly Project. All rights reserved.
5 * This code is derived from software contributed to The DragonFly Project
6 * by Simon Schubert <2@0x2c.org>.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * This binary is setuid root. Use extreme caution when touching
38 * user-supplied information. Keep the root window as small as possible.
41 #include <sys/param.h>
57 logfail(int exitcode
, const char *fmt
, ...)
66 vsnprintf(outs
, sizeof(outs
), fmt
, ap
);
72 syslog(LOG_ERR
, errno
? "%s: %m" : "%s", outs
);
74 syslog(LOG_ERR
, errno
? "%m" : "unknown error");
80 * Create a mbox in /var/mail for a given user, or make sure
81 * the permissions are correct for dma.
85 main(int argc
, char **argv
)
94 openlog("dma-mbox-create", 0, LOG_MAIL
);
97 gr
= getgrnam(DMA_GROUP
);
99 logfail(EX_CONFIG
, "cannot find dma group `%s'", DMA_GROUP
);
101 mail_gid
= gr
->gr_gid
;
103 if (setgid(mail_gid
) != 0)
104 logfail(EX_NOPERM
, "cannot set gid to %d (%s)", mail_gid
, DMA_GROUP
);
105 if (getegid() != mail_gid
)
106 logfail(EX_NOPERM
, "cannot set gid to %d (%s), still at %d", mail_gid
, DMA_GROUP
, getegid());
109 * We take exactly one argument: the username.
113 logfail(EX_USAGE
, "no arguments");
117 syslog(LOG_NOTICE
, "creating mbox for `%s'", user
);
119 /* the username may not contain a pathname separator */
120 if (strchr(user
, '/')) {
122 logfail(EX_DATAERR
, "path separator in username `%s'", user
);
126 /* verify the user exists */
130 logfail(EX_NOUSER
, "cannot find user `%s'", user
);
132 maildirfd
= open(_PATH_MAILDIR
, O_RDONLY
);
134 logfail(EX_NOINPUT
, "cannot open maildir %s", _PATH_MAILDIR
);
136 user_uid
= pw
->pw_uid
;
138 f
= openat(maildirfd
, user
, O_RDONLY
|O_CREAT
|O_NOFOLLOW
, 0600);
140 logfail(EX_NOINPUT
, "cannot open mbox `%s'", user
);
142 if (fchown(f
, user_uid
, mail_gid
))
143 logfail(EX_OSERR
, "cannot change owner of mbox `%s'", user
);
146 logfail(EX_OSERR
, "cannot change permissions of mbox `%s'",
149 /* file should be present with the right owner and permissions */
151 syslog(LOG_NOTICE
, "successfully created mbox for `%s'", user
);