mdw@git.distorted.org.uk Git - disorder/blob - lib/user.c

   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 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  */
  20 /** @file lib/user.c
  21  * @brief Jukebox user management
  22  */
  23
  24 #include <config.h>
  25 #include "types.h"
  26
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  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"
  37 #include "mem.h"
  38
  39 /** @brief Become the jukebox user
  40  *
  41  * If a jukebox user is configured then becomes that user.
  42  */
  43 void 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
  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  */
  71 void 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
 101 /*
 102 Local Variables:
 103 c-basic-offset:2
 104 comment-column:40
 105 fill-column:79
 106 indent-tabs-mode:nil
 107 End:
 108 */