get_default_principal.c revision 78527
155682Smarkm/* 278527Sassar * Copyright (c) 1997 - 2001 Kungliga Tekniska H�gskolan 355682Smarkm * (Royal Institute of Technology, Stockholm, Sweden). 455682Smarkm * All rights reserved. 555682Smarkm * 655682Smarkm * Redistribution and use in source and binary forms, with or without 755682Smarkm * modification, are permitted provided that the following conditions 855682Smarkm * are met: 955682Smarkm * 1055682Smarkm * 1. Redistributions of source code must retain the above copyright 1155682Smarkm * notice, this list of conditions and the following disclaimer. 1255682Smarkm * 1355682Smarkm * 2. Redistributions in binary form must reproduce the above copyright 1455682Smarkm * notice, this list of conditions and the following disclaimer in the 1555682Smarkm * documentation and/or other materials provided with the distribution. 1655682Smarkm * 1755682Smarkm * 3. Neither the name of the Institute nor the names of its contributors 1855682Smarkm * may be used to endorse or promote products derived from this software 1955682Smarkm * without specific prior written permission. 2055682Smarkm * 2155682Smarkm * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 2255682Smarkm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2355682Smarkm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2455682Smarkm * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 2555682Smarkm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2655682Smarkm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2755682Smarkm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2855682Smarkm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2955682Smarkm * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3055682Smarkm * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3155682Smarkm * SUCH DAMAGE. 3255682Smarkm */ 3355682Smarkm 3455682Smarkm#include "krb5_locl.h" 3555682Smarkm 3678527SassarRCSID("$Id: get_default_principal.c,v 1.7 2001/05/14 06:14:46 assar Exp $"); 3755682Smarkm 3855682Smarkm/* 3955682Smarkm * Try to find out what's a reasonable default principal. 4055682Smarkm */ 4155682Smarkm 4278527Sassarstatic const char* 4378527Sassarget_env_user(void) 4478527Sassar{ 4578527Sassar const char *user = getenv("USER"); 4678527Sassar if(user == NULL) 4778527Sassar user = getenv("LOGNAME"); 4878527Sassar if(user == NULL) 4978527Sassar user = getenv("USERNAME"); 5078527Sassar return user; 5178527Sassar} 5278527Sassar 5355682Smarkmkrb5_error_code 5455682Smarkmkrb5_get_default_principal (krb5_context context, 5555682Smarkm krb5_principal *princ) 5655682Smarkm{ 5755682Smarkm krb5_error_code ret; 5855682Smarkm krb5_ccache id; 5955682Smarkm const char *user; 6078527Sassar uid_t uid; 6155682Smarkm 6255682Smarkm ret = krb5_cc_default (context, &id); 6355682Smarkm if (ret == 0) { 6455682Smarkm ret = krb5_cc_get_principal (context, id, princ); 6555682Smarkm krb5_cc_close (context, id); 6655682Smarkm if (ret == 0) 6755682Smarkm return 0; 6855682Smarkm } 6955682Smarkm 7078527Sassar 7178527Sassar uid = getuid(); 7278527Sassar if(uid == 0) { 7378527Sassar user = getlogin(); 7478527Sassar if(user == NULL) 7578527Sassar user = get_env_user(); 7678527Sassar if(user != NULL && strcmp(user, "root") != 0) 7778527Sassar ret = krb5_make_principal(context, princ, NULL, user, "root", NULL); 7878527Sassar else 7978527Sassar ret = krb5_make_principal(context, princ, NULL, "root", NULL); 8055682Smarkm } else { 8178527Sassar struct passwd *pw = getpwuid(uid); 8278527Sassar if(pw != NULL) 8378527Sassar user = pw->pw_name; 8478527Sassar else { 8578527Sassar user = get_env_user(); 8678527Sassar if(user == NULL) 8778527Sassar user = getlogin(); 8878527Sassar } 8978527Sassar if(user == NULL) { 9078527Sassar krb5_set_error_string(context, 9178527Sassar "unable to figure out current principal"); 9278527Sassar return ENOTTY; /* XXX */ 9378527Sassar } 9455682Smarkm ret = krb5_make_principal(context, princ, NULL, user, NULL); 9555682Smarkm } 9678527Sassar 9755682Smarkm return ret; 9855682Smarkm} 99