lib/krb5/aname_to_localname.c

   1 /*
   2  * Copyright (c) 1997 - 1999, 2002 - 2003 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "krb5_locl.h"
  35
  36 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
  37 krb5_aname_to_localname (krb5_context context,
  38                          krb5_const_principal aname,
  39                          size_t lnsize,
  40                          char *lname)
  41 {
  42     krb5_error_code ret;
  43     krb5_realm *lrealms, *r;
  44     int valid;
  45     size_t len;
  46     const char *res;
  47
  48     ret = krb5_get_default_realms (context, &lrealms);
  49     if (ret)
  50         return ret;
  51
  52     valid = 0;
  53     for (r = lrealms; *r != NULL; ++r) {
  54         if (strcmp (*r, aname->realm) == 0) {
  55             valid = 1;
  56             break;
  57         }
  58     }
  59     krb5_free_host_realm (context, lrealms);
  60     if (valid == 0)
  61         return KRB5_NO_LOCALNAME;
  62
  63     if (aname->name.name_string.len == 1)
  64         res = aname->name.name_string.val[0];
  65     else if (aname->name.name_string.len == 2
  66              && strcmp (aname->name.name_string.val[1], "root") == 0) {
  67         krb5_principal rootprinc;
  68         krb5_boolean userok;
  69
  70         res = "root";
  71
  72         ret = krb5_copy_principal(context, aname, &rootprinc);
  73         if (ret)
  74             return ret;
  75
  76         userok = krb5_kuserok(context, rootprinc, res);
  77         krb5_free_principal(context, rootprinc);
  78         if (!userok)
  79             return KRB5_NO_LOCALNAME;
  80
  81     } else
  82         return KRB5_NO_LOCALNAME;
  83
  84     len = strlen (res);
  85     if (len >= lnsize)
  86         return ERANGE;
  87     strlcpy (lname, res, lnsize);
  88
  89     return 0;
  90 }