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/*
* Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "krb5_locl.h"
RCSID("$Id: get_default_principal.c 23280 2008-06-23 03:26:18Z lha $");
/*
* Try to find out what's a reasonable default principal.
*/
static const char*
get_env_user(void)
{
const char *user = getenv("USER");
if(user == NULL)
user = getenv("LOGNAME");
if(user == NULL)
user = getenv("USERNAME");
return user;
}
/*
* Will only use operating-system dependant operation to get the
* default principal, for use of functions that in ccache layer to
* avoid recursive calls.
*/
krb5_error_code
_krb5_get_default_principal_local (krb5_context context,
krb5_principal *princ)
{
krb5_error_code ret;
const char *user;
uid_t uid;
*princ = NULL;
uid = getuid();
if(uid == 0) {
user = getlogin();
if(user == NULL)
user = get_env_user();
if(user != NULL && strcmp(user, "root") != 0)
ret = krb5_make_principal(context, princ, NULL, user, "root", NULL);
else
ret = krb5_make_principal(context, princ, NULL, "root", NULL);
} else {
struct passwd *pw = getpwuid(uid);
if(pw != NULL)
user = pw->pw_name;
else {
user = get_env_user();
if(user == NULL)
user = getlogin();
}
if(user == NULL) {
krb5_set_error_message(context, ENOTTY,
"unable to figure out current principal");
return ENOTTY; /* XXX */
}
ret = krb5_make_principal(context, princ, NULL, user, NULL);
}
return ret;
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_get_default_principal (krb5_context context,
krb5_principal *princ)
{
krb5_error_code ret;
krb5_ccache id;
*princ = NULL;
ret = krb5_cc_default (context, &id);
if (ret == 0) {
ret = krb5_cc_get_principal (context, id, princ);
krb5_cc_close (context, id);
if (ret == 0)
return 0;
}
return _krb5_get_default_principal_local(context, princ);
}
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