1/* 2 * Copyright (c) 1997 - 2001 Kungliga Tekniska H��gskolan 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 40static const char* 41get_env_user(void) 42{ 43 const char *user = getenv("USER"); 44 if(user == NULL) 45 user = getenv("LOGNAME"); 46 if(user == NULL) 47 user = getenv("USERNAME"); 48 return user; 49} 50 51/* 52 * Will only use operating-system dependant operation to get the 53 * default principal, for use of functions that in ccache layer to 54 * avoid recursive calls. 55 */ 56 57krb5_error_code 58_krb5_get_default_principal_local (krb5_context context, 59 krb5_principal *princ) 60{ 61 krb5_error_code ret; 62 const char *user; 63 uid_t uid; 64 65 *princ = NULL; 66 67 uid = getuid(); 68 if(uid == 0) { 69 user = getlogin(); 70 if(user == NULL) 71 user = get_env_user(); 72 if(user != NULL && strcmp(user, "root") != 0) 73 ret = krb5_make_principal(context, princ, NULL, user, "root", NULL); 74 else 75 ret = krb5_make_principal(context, princ, NULL, "root", NULL); 76 } else { 77 struct passwd *pw = getpwuid(uid); 78 if(pw != NULL) 79 user = pw->pw_name; 80 else { 81 user = get_env_user(); 82 if(user == NULL) 83 user = getlogin(); 84 } 85 if(user == NULL) { 86 krb5_set_error_message(context, ENOTTY, 87 N_("unable to figure out current " 88 "principal", "")); 89 return ENOTTY; /* XXX */ 90 } 91 ret = krb5_make_principal(context, princ, NULL, user, NULL); 92 } 93 return ret; 94} 95 96krb5_error_code KRB5_LIB_FUNCTION 97krb5_get_default_principal (krb5_context context, 98 krb5_principal *princ) 99{ 100 krb5_error_code ret; 101 krb5_ccache id; 102 103 *princ = NULL; 104 105 ret = krb5_cc_default (context, &id); 106 if (ret == 0) { 107 ret = krb5_cc_get_principal (context, id, princ); 108 krb5_cc_close (context, id); 109 if (ret == 0) 110 return 0; 111 } 112 113 return _krb5_get_default_principal_local(context, princ); 114} 115