| 1 | /* |
| 2 | * This file is part of DisOrder |
| 3 | * Copyright (C) 2005, 2007 Richard Kettlewell |
| 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 3 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, |
| 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 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | /** @file lib/user.c |
| 19 | * @brief Jukebox user management |
| 20 | */ |
| 21 | |
| 22 | #include "common.h" |
| 23 | |
| 24 | #include <sys/types.h> |
| 25 | #include <sys/stat.h> |
| 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" |
| 34 | #include "mem.h" |
| 35 | |
| 36 | /** @brief Become the jukebox user |
| 37 | * |
| 38 | * If a jukebox user is configured then becomes that user. |
| 39 | */ |
| 40 | void become_mortal(void) { |
| 41 | struct passwd *pw; |
| 42 | |
| 43 | if(config->user) { |
| 44 | if(!(pw = getpwnam(config->user))) |
| 45 | disorder_fatal(0, "cannot find user %s", config->user); |
| 46 | if(pw->pw_uid != getuid()) { |
| 47 | disorder_info("becoming user %u group %u", |
| 48 | (unsigned)pw->pw_uid, |
| 49 | (unsigned)pw->pw_gid); |
| 50 | if(initgroups(config->user, pw->pw_gid)) |
| 51 | disorder_fatal(errno, "error calling initgroups"); |
| 52 | if(setgid(pw->pw_gid) < 0) |
| 53 | disorder_fatal(errno, "error calling setgid"); |
| 54 | if(setuid(pw->pw_uid) < 0) |
| 55 | disorder_fatal(errno, "error calling setgid"); |
| 56 | disorder_info("changed to user %s (uid %lu)", |
| 57 | config->user, (unsigned long)getuid()); |
| 58 | } |
| 59 | /* sanity checks */ |
| 60 | if(getuid() != pw->pw_uid) |
| 61 | disorder_fatal(0, "wrong real uid"); |
| 62 | if(geteuid() != pw->pw_uid) |
| 63 | disorder_fatal(0, "wrong effective uid"); |
| 64 | if(getgid() != pw->pw_gid) |
| 65 | disorder_fatal(0, "wrong real gid"); |
| 66 | if(getegid() != pw->pw_gid) |
| 67 | disorder_fatal(0, "wrong effective gid"); |
| 68 | if(setuid(0) != -1) |
| 69 | disorder_fatal(0, "setuid(0) unexpectedly succeeded"); |
| 70 | if(seteuid(0) != -1) |
| 71 | disorder_fatal(0, "seteuid(0) unexpectedly succeeded"); |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | /** @brief Create the jukebox state directory |
| 76 | * |
| 77 | * If the home directory does not exist then creates it and assigns |
| 78 | * it suitable permissions. |
| 79 | */ |
| 80 | void make_home(void) { |
| 81 | struct stat sb; |
| 82 | struct passwd *pw; |
| 83 | char *home, *p; |
| 84 | |
| 85 | if(stat(config->home, &sb) < 0) { |
| 86 | /* create parent directories */ |
| 87 | home = xstrdup(config->home); |
| 88 | p = home; |
| 89 | while(*p) { |
| 90 | if(*p == '/' && p > home) { |
| 91 | *p = 0; |
| 92 | mkdir(home, 0755); |
| 93 | *p = '/'; |
| 94 | } |
| 95 | ++p; |
| 96 | } |
| 97 | /* create the directory itself */ |
| 98 | if(mkdir(config->home, 02755) < 0) |
| 99 | disorder_fatal(errno, "error creating %s", config->home); |
| 100 | /* make sure it has the right ownership */ |
| 101 | if(config->user) { |
| 102 | if(!(pw = getpwnam(config->user))) |
| 103 | disorder_fatal(0, "cannot find user %s", config->user); |
| 104 | if(chown(config->home, pw->pw_uid, pw->pw_gid) < 0) |
| 105 | disorder_fatal(errno, "error chowning %s", config->home); |
| 106 | } |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | /* |
| 111 | Local Variables: |
| 112 | c-basic-offset:2 |
| 113 | comment-column:40 |
| 114 | fill-column:79 |
| 115 | indent-tabs-mode:nil |
| 116 | End: |
| 117 | */ |