mdw@git.distorted.org.uk Git - disorder/blob - clients/authorize.c

   1 /*
   2  * This file is part of DisOrder
   3  * Copyright (C) 2005 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
  21 #include <config.h>
  22 #include "types.h"
  23
  24 #include <pwd.h>
  25 #include <gcrypt.h>
  26 #include <errno.h>
  27 #include <unistd.h>
  28 #include <sys/stat.h>
  29 #include <fcntl.h>
  30 #include <stdio.h>
  31
  32 #include "authorize.h"
  33 #include "log.h"
  34 #include "configuration.h"
  35 #include "printf.h"
  36 #include "hex.h"
  37
  38 int authorize(const char *user) {
  39   uint8_t pwbin[10];
  40   const struct passwd *pw, *jbpw;
  41   gid_t jbgid;
  42   char *c, *t, *pwhex;
  43   int fd;
  44   FILE *fp;
  45
  46   if(!(jbpw = getpwnam(config->user)))
  47     fatal(0, "cannot find user %s", config->user);
  48   jbgid = jbpw->pw_gid;
  49   if(!(pw = getpwnam(user)))
  50     fatal(0, "no such user as %s", user);
  51   if((c = config_userconf(0, pw)) && access(c, F_OK) == 0) {
  52     error(0, "%s already exists", c);
  53     return -1;
  54   }
  55   if((c = config_usersysconf(pw)) && access(c, F_OK) == 0) {
  56     error(0, "%s already exists", c);
  57     return -1;
  58   }
  59   byte_xasprintf(&t, "%s.new", c);
  60   gcry_randomize(pwbin, sizeof pwbin, GCRY_STRONG_RANDOM);
  61   pwhex = hex(pwbin, sizeof pwbin);
  62
  63   /* create config.USER, to end up with mode 440 user:jukebox */
  64   if((fd = open(t, O_WRONLY|O_CREAT|O_EXCL, 0600)) < 0)
  65     fatal(errno, "error creating %s", t);
  66   if(fchown(fd, pw->pw_uid, -1) < 0)
  67     fatal(errno, "error chowning %s", t);
  68   if(fchmod(fd, 0400) < 0)
  69     fatal(errno, "error chmoding %s", t);
  70   if(!(fp = fdopen(fd, "w")))
  71     fatal(errno, "error calling fdopen");
  72   if(fprintf(fp, "password %s\n", pwhex) < 0
  73      || fclose(fp) < 0)
  74     fatal(errno, "error writing to %s", t);
  75   if(rename(t, c) < 0)
  76     fatal(errno, "error renaming %s to %s", t, c);
  77
  78   /* append to config.private.  We might create it along the way (though this
  79    * is unlikely) in which case it had better be 640 root:jukebox */
  80   if(!(c = config_private()))
  81     fatal(0, "cannot determine private config file");
  82   if((fd = open(c, O_WRONLY|O_APPEND|O_CREAT, 0600)) < 0)
  83     fatal(errno, "error opening %s", c);
  84   if(fchown(fd, 0, jbgid) < 0)
  85     fatal(errno, "error chowning %s", c);
  86   if(fchmod(fd, 0640) < 0)
  87     fatal(errno, "error chmoding %s", t);
  88   if(!(fp = fdopen(fd, "a")))
  89     fatal(errno, "error calling fdopen");
  90   if(fprintf(fp, "allow %s %s\n", user, pwhex) < 0
  91      || fclose(fp) < 0)
  92     fatal(errno, "error appending to %s", c);
  93   return 0;
  94 }
  95
  96 /*
  97 Local Variables:
  98 c-basic-offset:2
  99 comment-column:40
 100 fill-column:79
 101 indent-tabs-mode:nil
 102 End:
 103 */