03656ac1b0
the "core" Kerberos functionality. The rest of the userland will get their own changes later.
326 lines
8.3 KiB
C
326 lines
8.3 KiB
C
/*
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* Copyright (c) 1995, 1996, 1997 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. 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 Kungliga Tekniska
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* Högskolan and its contributors.
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*
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* 4. 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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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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RCSID("$Id: kauth.c,v 1.14 1997/05/07 02:21:30 assar Exp $");
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#include <roken.h>
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#include <des.h>
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#include <krb.h>
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#include <kafs.h>
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#include "extern.h"
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#include "krb4.h"
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#include "auth.h"
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#include "base64.h"
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static KTEXT_ST cip;
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static unsigned int lifetime;
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static time_t local_time;
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static krb_principal pr;
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static int
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save_tkt(char *user, char *instance, char *realm, void *arg,
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int (*key_proc)(char*, char*, char*, void*, des_cblock*), KTEXT *cipp)
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{
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local_time = time(0);
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memmove(&cip, *cipp, sizeof(cip));
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return -1;
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}
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static int
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store_ticket(KTEXT cip)
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{
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char *ptr;
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des_cblock session;
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krb_principal sp;
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unsigned char kvno;
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KTEXT_ST tkt;
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int left = cip->length;
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int kerror;
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time_t kdc_time;
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ptr = (char *) cip->dat;
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/* extract session key */
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memmove(session, ptr, 8);
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ptr += 8;
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left -= 8;
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if (strnlen(ptr, left) == left)
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return(INTK_BADPW);
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/* extract server's name */
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strcpy(sp.name, ptr);
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ptr += strlen(sp.name) + 1;
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left -= strlen(sp.name) + 1;
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if (strnlen(ptr, left) == left)
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return(INTK_BADPW);
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/* extract server's instance */
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strcpy(sp.instance, ptr);
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ptr += strlen(sp.instance) + 1;
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left -= strlen(sp.instance) + 1;
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if (strnlen(ptr, left) == left)
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return(INTK_BADPW);
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/* extract server's realm */
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strcpy(sp.realm,ptr);
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ptr += strlen(sp.realm) + 1;
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left -= strlen(sp.realm) + 1;
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if(left < 3)
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return INTK_BADPW;
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/* extract ticket lifetime, server key version, ticket length */
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/* be sure to avoid sign extension on lifetime! */
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lifetime = (unsigned char) ptr[0];
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kvno = (unsigned char) ptr[1];
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tkt.length = (unsigned char) ptr[2];
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ptr += 3;
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left -= 3;
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if (tkt.length > left)
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return(INTK_BADPW);
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/* extract ticket itself */
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memmove(tkt.dat, ptr, tkt.length);
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ptr += tkt.length;
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left -= tkt.length;
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/* Here is where the time should be verified against the KDC.
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* Unfortunately everything is sent in host byte order (receiver
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* makes wrong) , and at this stage there is no way for us to know
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* which byteorder the KDC has. So we simply ignore the time,
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* there are no security risks with this, the only thing that can
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* happen is that we might receive a replayed ticket, which could
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* at most be useless.
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*/
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#if 0
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/* check KDC time stamp */
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memmove(&kdc_time, ptr, sizeof(kdc_time));
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if (swap_bytes) swap_u_long(kdc_time);
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ptr += 4;
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if (abs((int)(local_time - kdc_time)) > CLOCK_SKEW) {
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return(RD_AP_TIME); /* XXX should probably be better
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code */
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}
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#endif
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/* initialize ticket cache */
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if (tf_create(TKT_FILE) != KSUCCESS)
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return(INTK_ERR);
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if (tf_put_pname(pr.name) != KSUCCESS ||
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tf_put_pinst(pr.instance) != KSUCCESS) {
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tf_close();
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return(INTK_ERR);
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}
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kerror = tf_save_cred(sp.name, sp.instance, sp.realm, session,
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lifetime, kvno, &tkt, local_time);
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tf_close();
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return(kerror);
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}
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void kauth(char *principal, char *ticket)
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{
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char *p;
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int ret;
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ret = krb_parse_name(principal, &pr);
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if(ret){
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reply(500, "Bad principal: %s.", krb_get_err_text(ret));
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return;
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}
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if(pr.realm[0] == 0)
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krb_get_lrealm(pr.realm, 1);
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if(ticket){
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cip.length = base64_decode(ticket, &cip.dat);
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if(cip.length == -1){
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reply(500, "Failed to decode data.");
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return;
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}
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ret = store_ticket(&cip);
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if(ret){
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reply(500, "Kerberos error: %s.", krb_get_err_text(ret));
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memset(&cip, 0, sizeof(cip));
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return;
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}
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if(k_hasafs())
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k_afsklog(0, 0);
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reply(200, "Tickets will be destroyed on exit.");
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return;
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}
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ret = krb_get_in_tkt (pr.name,
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pr.instance,
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pr.realm,
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KRB_TICKET_GRANTING_TICKET,
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pr.realm,
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DEFAULT_TKT_LIFE,
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NULL, save_tkt, NULL);
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if(ret != INTK_BADPW){
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reply(500, "Kerberos error: %s.", krb_get_err_text(ret));
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return;
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}
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base64_encode(cip.dat, cip.length, &p);
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reply(300, "P=%s T=%s", krb_unparse_name(&pr), p);
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free(p);
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memset(&cip, 0, sizeof(cip));
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}
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static char *
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short_date(int32_t dp)
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{
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char *cp;
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time_t t = (time_t)dp;
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if (t == (time_t)(-1L)) return "*** Never *** ";
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cp = ctime(&t) + 4;
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cp[15] = '\0';
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return (cp);
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}
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void klist(void)
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{
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int err;
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char *file = tkt_string();
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krb_principal pr;
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char buf1[128], buf2[128];
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int header = 1;
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CREDENTIALS c;
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err = tf_init(file, R_TKT_FIL);
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if(err != KSUCCESS){
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reply(500, "%s", krb_get_err_text(err));
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return;
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}
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tf_close();
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/*
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* We must find the realm of the ticket file here before calling
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* tf_init because since the realm of the ticket file is not
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* really stored in the principal section of the file, the
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* routine we use must itself call tf_init and tf_close.
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*/
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err = krb_get_tf_realm(file, pr.realm);
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if(err != KSUCCESS){
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reply(500, "%s", krb_get_err_text(err));
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return;
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}
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err = tf_init(file, R_TKT_FIL);
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if(err != KSUCCESS){
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reply(500, "%s", krb_get_err_text(err));
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return;
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}
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err = tf_get_pname(pr.name);
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if(err != KSUCCESS){
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reply(500, "%s", krb_get_err_text(err));
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return;
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}
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err = tf_get_pinst(pr.instance);
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if(err != KSUCCESS){
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reply(500, "%s", krb_get_err_text(err));
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return;
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}
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/*
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* You may think that this is the obvious place to get the
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* realm of the ticket file, but it can't be done here as the
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* routine to do this must open the ticket file. This is why
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* it was done before tf_init.
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*/
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lreply(200, "Principal: %s", krb_unparse_name(&pr));
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while ((err = tf_get_cred(&c)) == KSUCCESS) {
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if (header) {
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lreply(200, "%-15s %-15s %s",
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" Issued", " Expires", " Principal (kvno)");
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header = 0;
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}
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strcpy(buf1, short_date(c.issue_date));
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c.issue_date = krb_life_to_time(c.issue_date, c.lifetime);
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if (time(0) < (unsigned long) c.issue_date)
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strcpy(buf2, short_date(c.issue_date));
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else
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strcpy(buf2, ">>> Expired <<< ");
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lreply(200, "%s %s %s (%d)", buf1, buf2,
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krb_unparse_name_long(c.service, c.instance, c.realm), c.kvno);
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}
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if (header && err == EOF) {
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lreply(200, "No tickets in file.");
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}
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reply(200, "");
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}
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