204 lines
6.3 KiB
C
204 lines
6.3 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. 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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#include "krb_locl.h"
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RCSID("$Id: get_ad_tkt.c,v 1.22 1999/12/02 16:58:41 joda Exp $");
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/*
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* get_ad_tkt obtains a new service ticket from Kerberos, using
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* the ticket-granting ticket which must be in the ticket file.
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* It is typically called by krb_mk_req() when the client side
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* of an application is creating authentication information to be
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* sent to the server side.
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*
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* get_ad_tkt takes four arguments: three pointers to strings which
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* contain the name, instance, and realm of the service for which the
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* ticket is to be obtained; and an integer indicating the desired
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* lifetime of the ticket.
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*
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* It returns an error status if the ticket couldn't be obtained,
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* or AD_OK if all went well. The ticket is stored in the ticket
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* cache.
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*
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* The request sent to the Kerberos ticket-granting service looks
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* like this:
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*
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* pkt->dat
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*
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* TEXT original contents of authenticator+ticket
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* pkt->dat built in krb_mk_req call
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*
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* 4 bytes time_ws always 0 (?)
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* char lifetime lifetime argument passed
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* string service service name argument
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* string sinstance service instance arg.
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*
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* See "prot.h" for the reply packet layout and definitions of the
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* extraction macros like pkt_version(), pkt_msg_type(), etc.
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*/
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int
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get_ad_tkt(char *service, char *sinstance, char *realm, int lifetime)
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{
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static KTEXT_ST pkt_st;
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KTEXT pkt = & pkt_st; /* Packet to KDC */
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static KTEXT_ST rpkt_st;
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KTEXT rpkt = &rpkt_st; /* Returned packet */
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CREDENTIALS cr;
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char lrealm[REALM_SZ];
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u_int32_t time_ws = 0;
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int kerror;
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unsigned char *p;
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size_t rem;
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int tmp;
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/*
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* First check if we have a "real" TGT for the corresponding
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* realm, if we don't, use ordinary inter-realm authentication.
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*/
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kerror = krb_get_cred(KRB_TICKET_GRANTING_TICKET, realm, realm, &cr);
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if (kerror == KSUCCESS) {
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strlcpy(lrealm, realm, REALM_SZ);
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} else
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kerror = krb_get_tf_realm(TKT_FILE, lrealm);
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if (kerror != KSUCCESS)
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return(kerror);
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/*
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* Look for the session key (and other stuff we don't need)
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* in the ticket file for krbtgt.realm@lrealm where "realm"
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* is the service's realm (passed in "realm" argument) and
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* lrealm is the realm of our initial ticket. If we don't
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* have this, we will try to get it.
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*/
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if ((kerror = krb_get_cred(KRB_TICKET_GRANTING_TICKET,
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realm, lrealm, &cr)) != KSUCCESS) {
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/*
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* If realm == lrealm, we have no hope, so let's not even try.
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*/
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if ((strncmp(realm, lrealm, REALM_SZ)) == 0)
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return(AD_NOTGT);
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else{
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if ((kerror =
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get_ad_tkt(KRB_TICKET_GRANTING_TICKET,
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realm, lrealm, lifetime)) != KSUCCESS) {
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if (kerror == KDC_PR_UNKNOWN)
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return(AD_INTR_RLM_NOTGT);
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else
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return(kerror);
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}
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if ((kerror = krb_get_cred(KRB_TICKET_GRANTING_TICKET,
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realm, lrealm, &cr)) != KSUCCESS)
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return(kerror);
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}
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}
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/*
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* Make up a request packet to the "krbtgt.realm@lrealm".
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* Start by calling krb_mk_req() which puts ticket+authenticator
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* into "pkt". Then tack other stuff on the end.
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*/
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kerror = krb_mk_req(pkt,
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KRB_TICKET_GRANTING_TICKET,
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realm,lrealm,0L);
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if (kerror)
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return(AD_NOTGT);
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p = pkt->dat + pkt->length;
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rem = sizeof(pkt->dat) - pkt->length;
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tmp = krb_put_int(time_ws, p, rem, 4);
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if (tmp < 0)
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return KFAILURE;
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p += tmp;
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rem -= tmp;
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tmp = krb_put_int(lifetime, p, rem, 1);
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if (tmp < 0)
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return KFAILURE;
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p += tmp;
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rem -= tmp;
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tmp = krb_put_nir(service, sinstance, NULL, p, rem);
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if (tmp < 0)
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return KFAILURE;
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p += tmp;
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rem -= tmp;
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pkt->length = p - pkt->dat;
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rpkt->length = 0;
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/* Send the request to the local ticket-granting server */
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if ((kerror = send_to_kdc(pkt, rpkt, realm))) return(kerror);
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/* check packet version of the returned packet */
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{
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KTEXT_ST cip;
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CREDENTIALS cred;
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struct timeval tv;
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kerror = kdc_reply_cipher(rpkt, &cip);
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if(kerror != KSUCCESS)
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return kerror;
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encrypt_ktext(&cip, &cr.session, DES_DECRYPT);
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kerror = kdc_reply_cred(&cip, &cred);
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if(kerror != KSUCCESS)
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return kerror;
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if (strcmp(cred.service, service) || strcmp(cred.instance, sinstance) ||
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strcmp(cred.realm, realm)) /* not what we asked for */
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return INTK_ERR; /* we need a better code here XXX */
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krb_kdctimeofday(&tv);
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if (abs((int)(tv.tv_sec - cred.issue_date)) > CLOCK_SKEW) {
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return RD_AP_TIME; /* XXX should probably be better code */
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}
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kerror = save_credentials(cred.service, cred.instance, cred.realm,
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cred.session, cred.lifetime, cred.kvno,
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&cred.ticket_st, tv.tv_sec);
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return kerror;
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}
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}
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