1/* 2 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_LICENSE_HEADER_START@ 5 * 6 * "Portions Copyright (c) 1999 Apple Computer, Inc. All Rights 7 * Reserved. This file contains Original Code and/or Modifications of 8 * Original Code as defined in and that are subject to the Apple Public 9 * Source License Version 1.0 (the 'License'). You may not use this file 10 * except in compliance with the License. Please obtain a copy of the 11 * License at http://www.apple.com/publicsource and read it before using 12 * this file. 13 * 14 * The Original Code and all software distributed under the License are 15 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 16 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 17 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the 19 * License for the specific language governing rights and limitations 20 * under the License." 21 * 22 * @APPLE_LICENSE_HEADER_END@ 23 */ 24/*- 25 * Copyright (c) 1990, 1993, 1994 26 * The Regents of the University of California. All rights reserved. 27 * 28 * Redistribution and use in source and binary forms, with or without 29 * modification, are permitted provided that the following conditions 30 * are met: 31 * 1. Redistributions of source code must retain the above copyright 32 * notice, this list of conditions and the following disclaimer. 33 * 2. Redistributions in binary form must reproduce the above copyright 34 * notice, this list of conditions and the following disclaimer in the 35 * documentation and/or other materials provided with the distribution. 36 * 3. All advertising materials mentioning features or use of this software 37 * must display the following acknowledgement: 38 * This product includes software developed by the University of 39 * California, Berkeley and its contributors. 40 * 4. Neither the name of the University nor the names of its contributors 41 * may be used to endorse or promote products derived from this software 42 * without specific prior written permission. 43 * 44 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 45 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 46 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 47 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 48 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 49 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 50 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 51 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 52 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 53 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 54 * SUCH DAMAGE. 55 */ 56 57#ifdef KERBEROS 58#include <sys/param.h> 59#include <sys/syslog.h> 60#include <kerberosIV/des.h> 61#include <kerberosIV/krb.h> 62 63#include <err.h> 64#include <netdb.h> 65#include <pwd.h> 66#include <stdio.h> 67#include <stdlib.h> 68#include <string.h> 69#include <unistd.h> 70 71#define INITIAL_TICKET "krbtgt" 72#define VERIFY_SERVICE "rcmd" 73 74extern int notickets; 75extern char *krbtkfile_env; 76 77/* 78 * Attempt to log the user in using Kerberos authentication 79 * 80 * return 0 on success (will be logged in) 81 * 1 if Kerberos failed (try local password in login) 82 */ 83int 84klogin(pw, instance, localhost, password) 85 struct passwd *pw; 86 char *instance, *localhost, *password; 87{ 88 int kerror; 89 AUTH_DAT authdata; 90 KTEXT_ST ticket; 91 struct hostent *hp; 92 unsigned long faddr; 93 char realm[REALM_SZ], savehost[MAXHOSTNAMELEN]; 94 char tkt_location[MAXPATHLEN]; 95 char *krb_get_phost(); 96 97 /* 98 * Root logins don't use Kerberos. 99 * If we have a realm, try getting a ticket-granting ticket 100 * and using it to authenticate. Otherwise, return 101 * failure so that we can try the normal passwd file 102 * for a password. If that's ok, log the user in 103 * without issuing any tickets. 104 */ 105 if (strcmp(pw->pw_name, "root") == 0 || 106 krb_get_lrealm(realm, 0) != KSUCCESS) 107 return (1); 108 109 /* 110 * get TGT for local realm 111 * tickets are stored in a file named TKT_ROOT plus uid 112 * except for user.root tickets. 113 */ 114 115 if (strcmp(instance, "root") != 0) 116 (void)sprintf(tkt_location, "%s%d", TKT_ROOT, pw->pw_uid); 117 else { 118 (void)sprintf(tkt_location, "%s_root_%d", TKT_ROOT, pw->pw_uid); 119 krbtkfile_env = tkt_location; 120 } 121 (void)krb_set_tkt_string(tkt_location); 122 123 /* 124 * Set real as well as effective ID to 0 for the moment, 125 * to make the kerberos library do the right thing. 126 */ 127 if (setuid(0) < 0) { 128 warnx("setuid"); 129 return (1); 130 } 131 kerror = krb_get_pw_in_tkt(pw->pw_name, instance, 132 realm, INITIAL_TICKET, realm, DEFAULT_TKT_LIFE, password); 133 /* 134 * If we got a TGT, get a local "rcmd" ticket and check it so as to 135 * ensure that we are not talking to a bogus Kerberos server. 136 * 137 * There are 2 cases where we still allow a login: 138 * 1: the VERIFY_SERVICE doesn't exist in the KDC 139 * 2: local host has no srvtab, as (hopefully) indicated by a 140 * return value of RD_AP_UNDEC from krb_rd_req(). 141 */ 142 if (kerror != INTK_OK) { 143 if (kerror != INTK_BADPW && kerror != KDC_PR_UNKNOWN) { 144 syslog(LOG_ERR, "Kerberos intkt error: %s", 145 krb_err_txt[kerror]); 146 dest_tkt(); 147 } 148 return (1); 149 } 150 151 if (chown(TKT_FILE, pw->pw_uid, pw->pw_gid) < 0) 152 syslog(LOG_ERR, "chown tkfile (%s): %m", TKT_FILE); 153 154 (void)strncpy(savehost, krb_get_phost(localhost), sizeof(savehost)); 155 savehost[sizeof(savehost)-1] = NULL; 156 157 /* 158 * if the "VERIFY_SERVICE" doesn't exist in the KDC for this host, 159 * still allow login with tickets, but log the error condition. 160 */ 161 162 kerror = krb_mk_req(&ticket, VERIFY_SERVICE, savehost, realm, 33); 163 if (kerror == KDC_PR_UNKNOWN) { 164 syslog(LOG_NOTICE, 165 "warning: TGT not verified (%s); %s.%s not registered, or srvtab is wrong?", 166 krb_err_txt[kerror], VERIFY_SERVICE, savehost); 167 notickets = 0; 168 return (0); 169 } 170 171 if (kerror != KSUCCESS) { 172 warnx("unable to use TGT: (%s)", krb_err_txt[kerror]); 173 syslog(LOG_NOTICE, "unable to use TGT: (%s)", 174 krb_err_txt[kerror]); 175 dest_tkt(); 176 return (1); 177 } 178 179 if (!(hp = gethostbyname(localhost))) { 180 syslog(LOG_ERR, "couldn't get local host address"); 181 dest_tkt(); 182 return (1); 183 } 184 185 memmove((void *)&faddr, (void *)hp->h_addr, sizeof(faddr)); 186 187 kerror = krb_rd_req(&ticket, VERIFY_SERVICE, savehost, faddr, 188 &authdata, ""); 189 190 if (kerror == KSUCCESS) { 191 notickets = 0; 192 return (0); 193 } 194 195 /* undecipherable: probably didn't have a srvtab on the local host */ 196 if (kerror = RD_AP_UNDEC) { 197 syslog(LOG_NOTICE, "krb_rd_req: (%s)\n", krb_err_txt[kerror]); 198 dest_tkt(); 199 return (1); 200 } 201 /* failed for some other reason */ 202 warnx("unable to verify %s ticket: (%s)", VERIFY_SERVICE, 203 krb_err_txt[kerror]); 204 syslog(LOG_NOTICE, "couldn't verify %s ticket: %s", VERIFY_SERVICE, 205 krb_err_txt[kerror]); 206 dest_tkt(); 207 return (1); 208} 209#endif 210