116 lines
3.4 KiB
C
116 lines
3.4 KiB
C
/*
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* Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "krb5_locl.h"
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RCSID("$Id: get_default_principal.c 14870 2005-04-20 20:53:29Z lha $");
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/*
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* Try to find out what's a reasonable default principal.
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*/
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static const char*
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get_env_user(void)
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{
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const char *user = getenv("USER");
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if(user == NULL)
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user = getenv("LOGNAME");
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if(user == NULL)
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user = getenv("USERNAME");
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return user;
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}
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/*
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* Will only use operating-system dependant operation to get the
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* default principal, for use of functions that in ccache layer to
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* avoid recursive calls.
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*/
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krb5_error_code
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_krb5_get_default_principal_local (krb5_context context,
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krb5_principal *princ)
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{
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krb5_error_code ret;
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const char *user;
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uid_t uid;
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*princ = NULL;
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uid = getuid();
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if(uid == 0) {
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user = getlogin();
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if(user == NULL)
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user = get_env_user();
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if(user != NULL && strcmp(user, "root") != 0)
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ret = krb5_make_principal(context, princ, NULL, user, "root", NULL);
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else
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ret = krb5_make_principal(context, princ, NULL, "root", NULL);
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} else {
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struct passwd *pw = getpwuid(uid);
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if(pw != NULL)
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user = pw->pw_name;
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else {
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user = get_env_user();
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if(user == NULL)
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user = getlogin();
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}
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if(user == NULL) {
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krb5_set_error_string(context,
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"unable to figure out current principal");
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return ENOTTY; /* XXX */
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}
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ret = krb5_make_principal(context, princ, NULL, user, NULL);
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}
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return ret;
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}
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krb5_error_code KRB5_LIB_FUNCTION
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krb5_get_default_principal (krb5_context context,
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krb5_principal *princ)
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{
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krb5_error_code ret;
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krb5_ccache id;
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*princ = NULL;
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ret = krb5_cc_default (context, &id);
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if (ret == 0) {
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ret = krb5_cc_get_principal (context, id, princ);
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krb5_cc_close (context, id);
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if (ret == 0)
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return 0;
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}
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return _krb5_get_default_principal_local(context, princ);
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}
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