264 lines
7.5 KiB
C
264 lines
7.5 KiB
C
/*
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* Copyright (c) 1995, 1996, 1997, 1998 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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#include "krb_locl.h"
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RCSID("$Id: mk_req.c,v 1.20 1998/06/09 19:25:23 joda Exp $");
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static int lifetime = 255; /* But no longer than TGT says. */
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static int
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build_request(KTEXT req, char *name, char *inst, char *realm,
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u_int32_t checksum)
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{
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struct timeval tv;
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unsigned char *p = req->dat;
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int tmp;
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size_t rem = sizeof(req->dat);
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tmp = krb_put_nir(name, inst, realm, 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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tmp = krb_put_int(checksum, 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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/* Fill in the times on the request id */
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krb_kdctimeofday(&tv);
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if (rem < 1)
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return KFAILURE;
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*p++ = tv.tv_usec / 5000; /* 5ms */
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--rem;
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tmp = krb_put_int(tv.tv_sec, 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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/* Fill to a multiple of 8 bytes for DES */
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req->length = ((p - req->dat + 7)/8) * 8;
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return 0;
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}
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/*
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* krb_mk_req takes a text structure in which an authenticator is to
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* be built, the name of a service, an instance, a realm,
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* and a checksum. It then retrieves a ticket for
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* the desired service and creates an authenticator in the text
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* structure passed as the first argument. krb_mk_req returns
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* KSUCCESS on success and a Kerberos error code on failure.
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*
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* The peer procedure on the other end is krb_rd_req. When making
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* any changes to this routine it is important to make corresponding
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* changes to krb_rd_req.
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*
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* The authenticator consists of the following:
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*
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* authent->dat
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*
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* unsigned char KRB_PROT_VERSION protocol version no.
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* unsigned char AUTH_MSG_APPL_REQUEST message type
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* (least significant
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* bit of above) HOST_BYTE_ORDER local byte ordering
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* unsigned char kvno from ticket server's key version
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* string realm server's realm
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* unsigned char tl ticket length
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* unsigned char idl request id length
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* text ticket->dat ticket for server
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* text req_id->dat request id
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*
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* The ticket information is retrieved from the ticket cache or
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* fetched from Kerberos. The request id (called the "authenticator"
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* in the papers on Kerberos) contains the following:
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*
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* req_id->dat
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*
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* string cr.pname {name, instance, and
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* string cr.pinst realm of principal
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* string myrealm making this request}
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* 4 bytes checksum checksum argument given
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* unsigned char tv_local.tf_usec time (milliseconds)
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* 4 bytes tv_local.tv_sec time (seconds)
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*
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* req_id->length = 3 strings + 3 terminating nulls + 5 bytes for time,
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* all rounded up to multiple of 8.
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*/
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int
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krb_mk_req(KTEXT authent, char *service, char *instance, char *realm,
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int32_t checksum)
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{
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KTEXT_ST req_st;
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KTEXT req_id = &req_st;
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CREDENTIALS cr; /* Credentials used by retr */
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KTEXT ticket = &(cr.ticket_st); /* Pointer to tkt_st */
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int retval; /* Returned by krb_get_cred */
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char myrealm[REALM_SZ];
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unsigned char *p = authent->dat;
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int rem = sizeof(authent->dat);
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int tmp;
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tmp = krb_put_int(KRB_PROT_VERSION, 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_int(AUTH_MSG_APPL_REQUEST, 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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/* Get the ticket and move it into the authenticator */
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if (krb_ap_req_debug)
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krb_warning("Realm: %s\n", realm);
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retval = krb_get_cred(service,instance,realm,&cr);
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if (retval == RET_NOTKT) {
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retval = get_ad_tkt(service, instance, realm, lifetime);
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if (retval == KSUCCESS)
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retval = krb_get_cred(service, instance, realm, &cr);
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}
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if (retval != KSUCCESS)
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return retval;
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/*
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* With multi realm ticket files either find a matching TGT or
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* else use the first TGT for inter-realm authentication.
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*
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* In myrealm hold the realm of the principal "owning" the
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* corresponding ticket-granting-ticket.
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*/
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retval = krb_get_cred(KRB_TICKET_GRANTING_TICKET, realm, realm, 0);
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if (retval == KSUCCESS) {
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strcpy_truncate(myrealm, realm, REALM_SZ);
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} else
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retval = krb_get_tf_realm(TKT_FILE, myrealm);
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if (retval != KSUCCESS)
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return retval;
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if (krb_ap_req_debug)
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krb_warning("serv=%s.%s@%s princ=%s.%s@%s\n", service, instance, realm,
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cr.pname, cr.pinst, myrealm);
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tmp = krb_put_int(cr.kvno, 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_string(realm, 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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tmp = krb_put_int(ticket->length, 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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retval = build_request(req_id, cr.pname, cr.pinst, myrealm, checksum);
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if (retval != KSUCCESS)
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return retval;
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encrypt_ktext(req_id, &cr.session, DES_ENCRYPT);
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tmp = krb_put_int(req_id->length, 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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if (rem < ticket->length + req_id->length)
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return KFAILURE;
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memcpy(p, ticket->dat, ticket->length);
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p += ticket->length;
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rem -= ticket->length;
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memcpy(p, req_id->dat, req_id->length);
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p += req_id->length;
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rem -= req_id->length;
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authent->length = p - authent->dat;
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memset(&cr, 0, sizeof(cr));
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memset(&req_st, 0, sizeof(req_st));
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if (krb_ap_req_debug)
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krb_warning("Authent->length = %d\n", authent->length);
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return KSUCCESS;
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}
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/*
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* krb_set_lifetime sets the default lifetime for additional tickets
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* obtained via krb_mk_req().
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*
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* It returns the previous value of the default lifetime.
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*/
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int
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krb_set_lifetime(int newval)
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{
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int olife = lifetime;
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lifetime = newval;
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return(olife);
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}
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