chiark / gitweb /
(Slightly scrappy) new playlist box
[disorder] / lib / user.c
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460b9539 1/*
2 * This file is part of DisOrder
659d87e8 3 * Copyright (C) 2005, 2007 Richard Kettlewell
460b9539 4 *
e7eb3a27 5 * This program is free software: you can redistribute it and/or modify
460b9539 6 * it under the terms of the GNU General Public License as published by
e7eb3a27 7 * the Free Software Foundation, either version 3 of the License, or
460b9539 8 * (at your option) any later version.
e7eb3a27
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9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
460b9539 15 * You should have received a copy of the GNU General Public License
e7eb3a27 16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
460b9539 17 */
659d87e8
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18/** @file lib/user.c
19 * @brief Jukebox user management
20 */
460b9539 21
05b75f8d 22#include "common.h"
460b9539 23
24#include <sys/types.h>
659d87e8 25#include <sys/stat.h>
460b9539 26#include <errno.h>
27#include <pwd.h>
28#include <grp.h>
29#include <unistd.h>
30
31#include "user.h"
32#include "log.h"
33#include "configuration.h"
659d87e8 34#include "mem.h"
460b9539 35
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36/** @brief Become the jukebox user
37 *
38 * If a jukebox user is configured then becomes that user.
39 */
460b9539 40void become_mortal(void) {
41 struct passwd *pw;
42
43 if(config->user) {
44 if(!(pw = getpwnam(config->user)))
2e9ba080 45 disorder_fatal(0, "cannot find user %s", config->user);
460b9539 46 if(pw->pw_uid != getuid()) {
47 if(initgroups(config->user, pw->pw_gid))
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48 disorder_fatal(errno, "error calling initgroups");
49 if(setgid(pw->pw_gid) < 0)
50 disorder_fatal(errno, "error calling setgid");
51 if(setuid(pw->pw_uid) < 0)
52 disorder_fatal(errno, "error calling setgid");
53 disorder_info("changed to user %s (uid %lu)",
54 config->user, (unsigned long)getuid());
460b9539 55 }
56 /* sanity checks */
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57 if(getuid() != pw->pw_uid)
58 disorder_fatal(0, "wrong real uid");
59 if(geteuid() != pw->pw_uid)
60 disorder_fatal(0, "wrong effective uid");
61 if(getgid() != pw->pw_gid)
62 disorder_fatal(0, "wrong real gid");
63 if(getegid() != pw->pw_gid)
64 disorder_fatal(0, "wrong effective gid");
65 if(setuid(0) != -1)
66 disorder_fatal(0, "setuid(0) unexpectedly succeeded");
67 if(seteuid(0) != -1)
68 disorder_fatal(0, "seteuid(0) unexpectedly succeeded");
460b9539 69 }
70}
71
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72/** @brief Create the jukebox state directory
73 *
74 * If the home directory does not exist then creates it and assigns
75 * it suitable permissions.
76 */
77void make_home(void) {
78 struct stat sb;
79 struct passwd *pw;
80 char *home, *p;
81
82 if(stat(config->home, &sb) < 0) {
83 /* create parent directories */
84 home = xstrdup(config->home);
85 p = home;
86 while(*p) {
87 if(*p == '/' && p > home) {
88 *p = 0;
89 mkdir(home, 0755);
90 *p = '/';
91 }
92 ++p;
93 }
94 /* create the directory itself */
95 if(mkdir(config->home, 02755) < 0)
2e9ba080 96 disorder_fatal(errno, "error creating %s", config->home);
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97 /* make sure it has the right ownership */
98 if(config->user) {
99 if(!(pw = getpwnam(config->user)))
2e9ba080 100 disorder_fatal(0, "cannot find user %s", config->user);
659d87e8 101 if(chown(config->home, pw->pw_uid, pw->pw_gid) < 0)
2e9ba080 102 disorder_fatal(errno, "error chowning %s", config->home);
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103 }
104 }
105}
106
460b9539 107/*
108Local Variables:
109c-basic-offset:2
110comment-column:40
111fill-column:79
112indent-tabs-mode:nil
113End:
114*/