Line data    Source code

       1             : /*
       2             :  * Copyright (c) 1997 - 2001 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             : /*
      37             :  * Try to find out what's a reasonable default principal.
      38             :  */
      39             : 
      40             : KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
      41           0 : _krb5_get_default_principal_local (krb5_context context,
      42             :                                    krb5_principal *princ)
      43             : {
      44           0 :     const char *user = NULL;
      45           0 :     const char *second_component = NULL;
      46           0 :     char userbuf[128];
      47             : 
      48           0 :     *princ = NULL;
      49             : 
      50             :     /*
      51             :      * NOTE: We prefer getlogin_r() (via roken_get_loginname()) to using $USER,
      52             :      *       $LOGNAME, or getpwuid_r() (via roken_get_username()), in that
      53             :      *       order, otherwise we won't figure out to output
      54             :      *       <username>/root@DEFAULT_REALM.
      55             :      */
      56             : #ifndef WIN32
      57           0 :     if (geteuid() == 0)
      58           0 :         user = roken_get_loginname(userbuf, sizeof(userbuf));
      59             : #endif
      60           0 :     if (user == NULL)
      61           0 :         user = roken_get_username(userbuf, sizeof(userbuf));
      62           0 :     if (user == NULL) {
      63           0 :         krb5_set_error_message(context, ENOTTY,
      64           0 :                                N_("unable to figure out current principal",
      65             :                                   ""));
      66           0 :         return ENOTTY; /* XXX */
      67             :     }
      68             : 
      69             : #ifndef WIN32
      70           0 :     if (!issuid() && getuid() == 0 && strcmp(user, "root") != 0)
      71           0 :         second_component = "root"; /* We'll use <user>/root */
      72             : #endif
      73           0 :     return krb5_make_principal(context, princ, NULL, user,
      74             :                                second_component, NULL);
      75             : }
      76             : 
      77             : KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
      78           0 : krb5_get_default_principal (krb5_context context,
      79             :                             krb5_principal *princ)
      80             : {
      81           0 :     krb5_error_code ret;
      82           0 :     krb5_ccache id;
      83             : 
      84           0 :     *princ = NULL;
      85             : 
      86           0 :     ret = krb5_cc_default (context, &id);
      87           0 :     if (ret == 0) {
      88           0 :         ret = krb5_cc_get_principal (context, id, princ);
      89           0 :         krb5_cc_close (context, id);
      90           0 :         if (ret == 0)
      91           0 :             return 0;
      92             :     }
      93             : 
      94           0 :     return _krb5_get_default_principal_local(context, princ);
      95             : }