257 lines
7.0 KiB
C
257 lines
7.0 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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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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* 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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* 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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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#ifndef lint
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/*static char sccsid[] = "from: @(#)klogin.c 5.11 (Berkeley) 7/12/92";*/
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static char rcsid[] = "$Id: k5login.c,v 1.1 1994/07/25 21:11:09 brezak Exp $";
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#endif /* not lint */
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#ifdef KERBEROS5
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#include <sys/param.h>
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#include <sys/syslog.h>
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#include <com_err.h>
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#include <krb5/krb5.h>
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#include <krb5/ext-proto.h>
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#include <krb5/los-proto.h>
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#include <pwd.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#define KRB5_DEFAULT_OPTIONS 0
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#define KRB5_DEFAULT_LIFE 60*60*10 /* 10 hours */
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krb5_data tgtname = {
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KRB5_TGS_NAME_SIZE,
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KRB5_TGS_NAME
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};
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/*
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* Try no preauthentication first; then try the encrypted timestamp
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*/
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int preauth_search_list[] = {
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0,
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KRB5_PADATA_ENC_TIMESTAMP,
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-1
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};
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extern int notickets;
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extern char *krbtkfile_env;
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extern char *tty;
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static char tkt_location[MAXPATHLEN];
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/*
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* Attempt to log the user in using Kerberos authentication
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*
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* return 0 on success (will be logged in)
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* 1 if Kerberos failed (try local password in login)
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*/
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int
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klogin(pw, instance, localhost, password)
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struct passwd *pw;
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char *instance, *localhost, *password;
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{
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krb5_error_code kerror;
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krb5_address **my_addresses;
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krb5_principal me, server;
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krb5_creds my_creds;
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krb5_timestamp now;
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krb5_ccache ccache = NULL;
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int preauth_type = -1;
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long lifetime = KRB5_DEFAULT_LIFE;
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int options = KRB5_DEFAULT_OPTIONS;
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int i;
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char *realm, *client_name;
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char *principal;
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#ifdef SKEY
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/*
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* We don't do s/key challenge and Kerberos at the same time
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*/
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if (strcasecmp(password, "s/key") == 0) {
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return (1);
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}
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#endif
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krb5_init_ets();
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/*
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* Root logins don't use Kerberos.
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* If we have a realm, try getting a ticket-granting ticket
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* and using it to authenticate. Otherwise, return
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* failure so that we can try the normal passwd file
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* for a password. If that's ok, log the user in
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* without issuing any tickets.
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*/
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if (strcmp(pw->pw_name, "root") == 0 ||
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krb5_get_default_realm(&realm))
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return (1);
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/*
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* get TGT for local realm
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* tickets are stored in a file named TKT_ROOT plus uid
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* except for user.root tickets.
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*/
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if (strcmp(instance, "root") != 0)
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(void)sprintf(tkt_location, "FILE:/tmp/krb5cc_%d.%s",
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pw->pw_uid, tty);
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else
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(void)sprintf(tkt_location, "FILE:/tmp/krb5cc_root_%d.%s",
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pw->pw_uid, tty);
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krbtkfile_env = tkt_location;
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principal = malloc(strlen(pw->pw_name)+strlen(instance)+2);
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strcpy(principal, pw->pw_name);
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if (strlen(instance)) {
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strcat(principal, "/");
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strcat(principal, instance);
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}
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if (kerror = krb5_cc_resolve(tkt_location, &ccache)) {
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syslog(LOG_NOTICE, "warning: %s while getting default ccache",
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error_message(kerror));
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return(1);
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}
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if (kerror = krb5_parse_name(principal, &me)) {
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syslog(LOG_NOTICE, "warning: %s when parsing name %s",
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error_message(kerror), principal);
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return(1);
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}
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if (kerror = krb5_unparse_name(me, &client_name)) {
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syslog(LOG_NOTICE, "warning: %s when unparsing name %s",
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error_message(kerror), principal);
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return(1);
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}
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kerror = krb5_cc_initialize (ccache, me);
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if (kerror != 0) {
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syslog(LOG_NOTICE, "%s when initializing cache %s",
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error_message(kerror), tkt_location);
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return(1);
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}
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memset((char *)&my_creds, 0, sizeof(my_creds));
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my_creds.client = me;
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if (kerror = krb5_build_principal_ext(&server,
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krb5_princ_realm(me)->length,
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krb5_princ_realm(me)->data,
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tgtname.length, tgtname.data,
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krb5_princ_realm(me)->length,
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krb5_princ_realm(me)->data,
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0)) {
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syslog(LOG_NOTICE, "%s while building server name",
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error_message(kerror));
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return(1);
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}
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my_creds.server = server;
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kerror = krb5_os_localaddr(&my_addresses);
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if (kerror != 0) {
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syslog(LOG_NOTICE, "%s when getting my address",
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error_message(kerror));
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return(1);
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}
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if (kerror = krb5_timeofday(&now)) {
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syslog(LOG_NOTICE, "%s while getting time of day",
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error_message(kerror));
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return(1);
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}
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my_creds.times.starttime = 0; /* start timer when request
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gets to KDC */
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my_creds.times.endtime = now + lifetime;
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my_creds.times.renew_till = 0;
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for (i=0; preauth_search_list[i] >= 0; i++) {
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kerror = krb5_get_in_tkt_with_password(options, my_addresses,
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preauth_search_list[i],
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ETYPE_DES_CBC_CRC,
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KEYTYPE_DES,
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password,
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ccache,
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&my_creds, 0);
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if (kerror != KRB5KDC_PREAUTH_FAILED &&
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kerror != KRB5KRB_ERR_GENERIC)
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break;
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}
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krb5_free_principal(server);
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krb5_free_addresses(my_addresses);
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if (chown(&tkt_location[5], pw->pw_uid, pw->pw_gid) < 0)
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syslog(LOG_ERR, "chown tkfile (%s): %m", &tkt_location[5]);
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if (kerror) {
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if (kerror == KRB5KRB_AP_ERR_BAD_INTEGRITY)
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printf("%s: Kerberos Password incorrect\n", principal);
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else
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printf("%s while getting initial credentials\n", error_message(kerror));
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return(1);
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}
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/* Success */
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notickets = 0;
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return(0);
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}
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/*
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* Remove any credentials
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*/
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void
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kdestroy()
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{
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krb5_error_code code;
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krb5_ccache ccache = NULL;
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if (krbtkfile_env == NULL)
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return;
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code = krb5_cc_resolve(krbtkfile_env, &ccache);
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if (!code) {
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code = krb5_cc_destroy(ccache);
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if (!code) {
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krb5_cc_close(ccache);
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}
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}
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}
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#endif
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