chiark / gitweb /
avoid crashes on log client teardown
[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 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
18 * USA
19 */
659d87e8
RK
20/** @file lib/user.c
21 * @brief Jukebox user management
22 */
460b9539 23
24#include <config.h>
25#include "types.h"
26
27#include <sys/types.h>
659d87e8 28#include <sys/stat.h>
460b9539 29#include <errno.h>
30#include <pwd.h>
31#include <grp.h>
32#include <unistd.h>
33
34#include "user.h"
35#include "log.h"
36#include "configuration.h"
659d87e8 37#include "mem.h"
460b9539 38
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RK
39/** @brief Become the jukebox user
40 *
41 * If a jukebox user is configured then becomes that user.
42 */
460b9539 43void become_mortal(void) {
44 struct passwd *pw;
45
46 if(config->user) {
47 if(!(pw = getpwnam(config->user)))
48 fatal(0, "cannot find user %s", config->user);
49 if(pw->pw_uid != getuid()) {
50 if(initgroups(config->user, pw->pw_gid))
51 fatal(errno, "error calling initgroups");
52 if(setgid(pw->pw_gid) < 0) fatal(errno, "error calling setgid");
53 if(setuid(pw->pw_uid) < 0) fatal(errno, "error calling setgid");
54 info("changed to user %s (uid %lu)", config->user, (unsigned long)getuid());
55 }
56 /* sanity checks */
57 if(getuid() != pw->pw_uid) fatal(0, "wrong real uid");
58 if(geteuid() != pw->pw_uid) fatal(0, "wrong effective uid");
59 if(getgid() != pw->pw_gid) fatal(0, "wrong real gid");
60 if(getegid() != pw->pw_gid) fatal(0, "wrong effective gid");
61 if(setuid(0) != -1) fatal(0, "setuid(0) unexpectedly succeeded");
62 if(seteuid(0) != -1) fatal(0, "seteuid(0) unexpectedly succeeded");
63 }
64}
65
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66/** @brief Create the jukebox state directory
67 *
68 * If the home directory does not exist then creates it and assigns
69 * it suitable permissions.
70 */
71void make_home(void) {
72 struct stat sb;
73 struct passwd *pw;
74 char *home, *p;
75
76 if(stat(config->home, &sb) < 0) {
77 /* create parent directories */
78 home = xstrdup(config->home);
79 p = home;
80 while(*p) {
81 if(*p == '/' && p > home) {
82 *p = 0;
83 mkdir(home, 0755);
84 *p = '/';
85 }
86 ++p;
87 }
88 /* create the directory itself */
89 if(mkdir(config->home, 02755) < 0)
90 fatal(errno, "error creating %s", config->home);
91 /* make sure it has the right ownership */
92 if(config->user) {
93 if(!(pw = getpwnam(config->user)))
94 fatal(0, "cannot find user %s", config->user);
95 if(chown(config->home, pw->pw_uid, pw->pw_gid) < 0)
96 fatal(errno, "error chowning %s", config->home);
97 }
98 }
99}
100
460b9539 101/*
102Local Variables:
103c-basic-offset:2
104comment-column:40
105fill-column:79
106indent-tabs-mode:nil
107End:
108*/