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Merge from disorder.dev.
[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
RK
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
RK
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
659d87e8
RK
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)))
45 fatal(0, "cannot find user %s", config->user);
46 if(pw->pw_uid != getuid()) {
47 if(initgroups(config->user, pw->pw_gid))
48 fatal(errno, "error calling initgroups");
49 if(setgid(pw->pw_gid) < 0) fatal(errno, "error calling setgid");
50 if(setuid(pw->pw_uid) < 0) fatal(errno, "error calling setgid");
51 info("changed to user %s (uid %lu)", config->user, (unsigned long)getuid());
52 }
53 /* sanity checks */
54 if(getuid() != pw->pw_uid) fatal(0, "wrong real uid");
55 if(geteuid() != pw->pw_uid) fatal(0, "wrong effective uid");
56 if(getgid() != pw->pw_gid) fatal(0, "wrong real gid");
57 if(getegid() != pw->pw_gid) fatal(0, "wrong effective gid");
58 if(setuid(0) != -1) fatal(0, "setuid(0) unexpectedly succeeded");
59 if(seteuid(0) != -1) fatal(0, "seteuid(0) unexpectedly succeeded");
60 }
61}
62
659d87e8
RK
63/** @brief Create the jukebox state directory
64 *
65 * If the home directory does not exist then creates it and assigns
66 * it suitable permissions.
67 */
68void make_home(void) {
69 struct stat sb;
70 struct passwd *pw;
71 char *home, *p;
72
73 if(stat(config->home, &sb) < 0) {
74 /* create parent directories */
75 home = xstrdup(config->home);
76 p = home;
77 while(*p) {
78 if(*p == '/' && p > home) {
79 *p = 0;
80 mkdir(home, 0755);
81 *p = '/';
82 }
83 ++p;
84 }
85 /* create the directory itself */
86 if(mkdir(config->home, 02755) < 0)
87 fatal(errno, "error creating %s", config->home);
88 /* make sure it has the right ownership */
89 if(config->user) {
90 if(!(pw = getpwnam(config->user)))
91 fatal(0, "cannot find user %s", config->user);
92 if(chown(config->home, pw->pw_uid, pw->pw_gid) < 0)
93 fatal(errno, "error chowning %s", config->home);
94 }
95 }
96}
97
460b9539 98/*
99Local Variables:
100c-basic-offset:2
101comment-column:40
102fill-column:79
103indent-tabs-mode:nil
104End:
105*/