mdw@git.distorted.org.uk Git - disorder/blob - clients/authorize.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
  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 "client.h"
  33 #include "authorize.h"
  34 #include "log.h"
  35 #include "configuration.h"
  36 #include "printf.h"
  37 #include "hex.h"
  38
  39 /** @brief Create a DisOrder login for the calling user, called @p user
  40  * @param client DisOrder client
  41  * @param user Username to create (UTF-8)
  42  * @param rights Initial rights or NULL for default
  43  * @return 0 on success, non-0 on error
  44  */
  45 int authorize(disorder_client *client, const char *user, const char *rights) {
  46   uint8_t pwbin[10];
  47   const struct passwd *pw, *jbpw;
  48   gid_t jbgid;
  49   char *c, *t, *pwhex;
  50   int fd;
  51   FILE *fp;
  52
  53   if(!(jbpw = getpwnam(config->user)))
  54     fatal(0, "cannot find user %s", config->user);
  55   jbgid = jbpw->pw_gid;
  56   if(!(pw = getpwnam(user)))
  57     fatal(0, "no such user as %s", user);
  58   if((c = config_userconf(0, pw)) && access(c, F_OK) == 0) {
  59     error(0, "%s already exists", c);
  60     return -1;
  61   }
  62   if((c = config_usersysconf(pw)) && access(c, F_OK) == 0) {
  63     error(0, "%s already exists", c);
  64     return -1;
  65   }
  66   byte_xasprintf(&t, "%s.new", c);
  67   gcry_randomize(pwbin, sizeof pwbin, GCRY_STRONG_RANDOM);
  68   pwhex = hex(pwbin, sizeof pwbin);
  69
  70   /* create config.USER, to end up with mode 400 user:<anything> */
  71   if((fd = open(t, O_WRONLY|O_CREAT|O_EXCL, 0600)) < 0)
  72     fatal(errno, "error creating %s", t);
  73   if(fchown(fd, pw->pw_uid, -1) < 0)
  74     fatal(errno, "error chowning %s", t);
  75   if(fchmod(fd, 0400) < 0)
  76     fatal(errno, "error chmoding %s", t);
  77   if(!(fp = fdopen(fd, "w")))
  78     fatal(errno, "error calling fdopen");
  79   if(fprintf(fp, "password %s\n", pwhex) < 0
  80      || fclose(fp) < 0)
  81     fatal(errno, "error writing to %s", t);
  82   if(rename(t, c) < 0)
  83     fatal(errno, "error renaming %s to %s", t, c);
  84
  85   /* create the user on the server */
  86   if(disorder_adduser(client, user, pwhex, rights))
  87     return -1;
  88
  89   return 0;
  90 }
  91
  92 /*
  93 Local Variables:
  94 c-basic-offset:2
  95 comment-column:40
  96 fill-column:79
  97 indent-tabs-mode:nil
  98 End:
  99 */