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c1ebccb4 SS |
1 | /* |
2 | * Copyright (c) 2010 Simon Schubert <2@0x2c.org> | |
3 | * Copyright (c) 2008 The DragonFly Project. All rights reserved. | |
4 | * | |
5 | * This code is derived from software contributed to The DragonFly Project | |
6 | * by Simon 'corecode' Schubert <corecode@fs.ei.tum.de>. | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
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 | |
17 | * distribution. | |
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. | |
21 | * | |
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 | |
33 | * SUCH DAMAGE. | |
34 | */ | |
35 | ||
36 | /* | |
37 | * This binary is setuid root. Use extreme caution when touching | |
38 | * user-supplied information. Keep the root window as small as possible. | |
39 | */ | |
40 | ||
41 | #include <sys/param.h> | |
42 | #include <sys/stat.h> | |
43 | ||
9ffd73f0 | 44 | #include <errno.h> |
c1ebccb4 SS |
45 | #include <fcntl.h> |
46 | #include <grp.h> | |
47 | #include <paths.h> | |
48 | #include <pwd.h> | |
49 | #include <stdio.h> | |
9ffd73f0 | 50 | #include <syslog.h> |
c1ebccb4 SS |
51 | #include <unistd.h> |
52 | ||
53 | #include "dma.h" | |
54 | ||
9ffd73f0 SS |
55 | |
56 | static void | |
57 | logfail(const char *fmt, ...) | |
58 | { | |
59 | int oerrno = errno; | |
60 | va_list ap; | |
61 | char outs[1024]; | |
62 | ||
63 | outs[0] = 0; | |
64 | if (fmt != NULL) { | |
65 | va_start(ap, fmt); | |
66 | vsnprintf(outs, sizeof(outs), fmt, ap); | |
67 | va_end(ap); | |
68 | } | |
69 | ||
70 | errno = oerrno; | |
71 | if (*outs != 0) | |
72 | syslog(LOG_ERR, errno ? "%s: %m" : "%s", outs); | |
73 | else | |
74 | syslog(LOG_ERR, errno ? "%m" : "unknown error"); | |
75 | ||
76 | exit(1); | |
77 | } | |
78 | ||
c1ebccb4 SS |
79 | /* |
80 | * Create a mbox in /var/mail for a given user, or make sure | |
81 | * the permissions are correct for dma. | |
82 | */ | |
83 | ||
84 | int | |
85 | main(int argc, char **argv) | |
86 | { | |
87 | const char *user; | |
88 | struct passwd *pw; | |
89 | struct group *gr; | |
90 | uid_t user_uid; | |
91 | gid_t mail_gid; | |
92 | int error; | |
93 | char fn[PATH_MAX+1]; | |
94 | int f; | |
95 | ||
9ffd73f0 SS |
96 | openlog("dma-mbox-create", 0, LOG_MAIL); |
97 | ||
98 | errno = 0; | |
99 | gr = getgrnam(DMA_GROUP); | |
100 | if (!gr) | |
101 | logfail("cannot find dma group `%s'", DMA_GROUP); | |
102 | ||
103 | mail_gid = gr->gr_gid; | |
104 | ||
105 | if (setgid(mail_gid) != 0) | |
106 | logfail("cannot set gid to %d (%s)", mail_gid, DMA_GROUP); | |
107 | if (getegid() != mail_gid) | |
108 | logfail("cannot set gid to %d (%s), still at %d", mail_gid, DMA_GROUP, getegid()); | |
109 | ||
c1ebccb4 SS |
110 | /* |
111 | * We take exactly one argument: the username. | |
112 | */ | |
9ffd73f0 SS |
113 | if (argc != 2) { |
114 | errno = 0; | |
115 | logfail("no arguments"); | |
116 | } | |
c1ebccb4 SS |
117 | user = argv[1]; |
118 | ||
9ffd73f0 SS |
119 | syslog(LOG_NOTICE, "creating mbox for `%s'", user); |
120 | ||
c1ebccb4 | 121 | /* the username may not contain a pathname separator */ |
9ffd73f0 SS |
122 | if (strchr(user, '/')) { |
123 | errno = 0; | |
124 | logfail("path separator in username `%s'", user); | |
125 | exit(1); | |
126 | } | |
c1ebccb4 SS |
127 | |
128 | /* verify the user exists */ | |
9ffd73f0 | 129 | errno = 0; |
c1ebccb4 SS |
130 | pw = getpwnam(user); |
131 | if (!pw) | |
9ffd73f0 | 132 | logfail("cannot find user `%s'", user); |
c1ebccb4 SS |
133 | |
134 | user_uid = pw->pw_uid; | |
135 | ||
c1ebccb4 | 136 | error = snprintf(fn, sizeof(fn), "%s/%s", _PATH_MAILDIR, user); |
9ffd73f0 SS |
137 | if (error < 0 || (size_t)error >= sizeof(fn)) { |
138 | if (error >= 0) { | |
139 | errno = 0; | |
140 | logfail("mbox path too long"); | |
141 | } | |
142 | logfail("cannot build mbox path for `%s/%s'", _PATH_MAILDIR, user); | |
143 | } | |
c1ebccb4 SS |
144 | |
145 | f = open(fn, O_RDONLY|O_CREAT, 0600); | |
146 | if (f < 0) | |
9ffd73f0 | 147 | logfail("cannot open mbox `%s'", fn); |
c1ebccb4 SS |
148 | |
149 | if (fchown(f, user_uid, mail_gid)) | |
9ffd73f0 | 150 | logfail("cannot change owner of mbox `%s'", fn); |
c1ebccb4 | 151 | |
b7f06fda | 152 | if (fchmod(f, 0620)) |
9ffd73f0 | 153 | logfail("cannot change permissions of mbox `%s'", fn); |
c1ebccb4 SS |
154 | |
155 | /* file should be present with the right owner and permissions */ | |
156 | ||
9ffd73f0 SS |
157 | syslog(LOG_NOTICE, "successfully created mbox for `%s'", user); |
158 | ||
c1ebccb4 SS |
159 | return (0); |
160 | } |