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/*
* $Source$
* $Author$
*
* Copyright 1990,1991 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* krb5_send_tgs()
*/
#if !defined(lint) && !defined(SABER)
static char rcsid_send_tgs_c[] =
"$Id$";
#endif /* !lint & !SABER */
#include <krb5/krb5.h>
#include <krb5/asn1.h>
#include <krb5/los-proto.h>
#include <krb5/ext-proto.h>
/*
Sends a request to the TGS and waits for a response.
options is used for the options in the KRB_TGS_REQ.
timestruct values are used for from, till, rtime " " "
etype is used for etype " " ", and to encrypt the authorization data, if present
sumtype is used for the checksum in the AP_REQ in the KRB_TGS_REQ
sname is used for sname " " "
addrs, if non-NULL, is used for addresses " " "
authorization_dat, if non-NULL, is used for authorization_dat " " "
second_ticket, if required by options, is used for the 2nd ticket in the req.
usecred is used for the ticket & session key in the KRB_AP_REQ header " " "
(the KDC realm is extracted from usecred->server's realm)
The response is placed into *rep.
rep->response.data is set to point at allocated storage which should be
freed by the caller when finished.
returns system errors
*/
krb5_error_code
krb5_send_tgs(DECLARG(const krb5_flags, kdcoptions),
DECLARG(const krb5_ticket_times *,timestruct),
DECLARG(const krb5_enctype, etype),
DECLARG(const krb5_cksumtype, sumtype),
DECLARG(krb5_const_principal, sname),
DECLARG(krb5_address * const *, addrs),
DECLARG(krb5_authdata * const *,authorization_data),
DECLARG(krb5_pa_data * const *, padata),
DECLARG(const krb5_data *,second_ticket),
DECLARG(krb5_creds *,usecred),
DECLARG(krb5_response *,rep))
OLDDECLARG(const krb5_flags, kdcoptions)
OLDDECLARG(const krb5_ticket_times *,timestruct)
OLDDECLARG(const krb5_enctype, etype)
OLDDECLARG(const krb5_cksumtype, sumtype)
OLDDECLARG(krb5_const_principal, sname)
OLDDECLARG(krb5_address * const *, addrs)
OLDDECLARG(krb5_authdata * const *,authorization_data)
OLDDECLARG(krb5_pa_data * const *, padata)
OLDDECLARG(const krb5_data *,second_ticket)
OLDDECLARG(krb5_creds *,usecred)
OLDDECLARG(krb5_response *,rep)
{
krb5_error_code retval;
krb5_kdc_req tgsreq;
krb5_checksum ap_checksum;
krb5_data *scratch, scratch2;
krb5_ticket *sec_ticket = 0;
krb5_ticket *sec_ticket_arr[2];
krb5_enctype etypes[1];
krb5_timestamp time_now;
krb5_pa_data **combined_padata;
krb5_pa_data ap_req_padata;
if (!valid_etype(etype))
return KRB5_PROG_ETYPE_NOSUPP;
memset((char *)&tgsreq, 0, sizeof(tgsreq));
tgsreq.kdc_options = kdcoptions;
tgsreq.server = (krb5_principal) sname;
tgsreq.from = timestruct->starttime;
tgsreq.till = timestruct->endtime;
tgsreq.rtime = timestruct->renew_till;
if (retval = krb5_timeofday(&time_now))
return(retval);
/* XXX we know they are the same size... */
tgsreq.nonce = (krb5_int32) time_now;
etypes[0] = etype;
tgsreq.etype = etypes;
tgsreq.netypes = 1;
tgsreq.addresses = (krb5_address **) addrs;
if (authorization_data) {
/* need to encrypt it in the request */
krb5_encrypt_block eblock;
if (retval = encode_krb5_authdata(authorization_data, &scratch))
return(retval);
krb5_use_cstype(&eblock, etype);
tgsreq.authorization_data.etype = etype;
tgsreq.authorization_data.kvno = 0; /* ticket session key has */
/* no version */
tgsreq.authorization_data.ciphertext.length =
krb5_encrypt_size(scratch->length,
eblock.crypto_entry);
/* add padding area, and zero it */
if (!(scratch->data = realloc(scratch->data,
tgsreq.authorization_data.ciphertext.length))) {
/* may destroy scratch->data */
xfree(scratch);
return ENOMEM;
}
memset(scratch->data + scratch->length, 0,
tgsreq.authorization_data.ciphertext.length - scratch->length);
if (!(tgsreq.authorization_data.ciphertext.data =
malloc(tgsreq.authorization_data.ciphertext.length))) {
krb5_free_data(scratch);
return ENOMEM;
}
if (retval = krb5_process_key(&eblock, &usecred->keyblock)) {
krb5_free_data(scratch);
return retval;
}
/* call the encryption routine */
if (retval = krb5_encrypt((krb5_pointer) scratch->data,
(krb5_pointer) tgsreq.authorization_data.ciphertext.data,
scratch->length, &eblock, 0)) {
(void) krb5_finish_key(&eblock);
xfree(tgsreq.authorization_data.ciphertext.data);
krb5_free_data(scratch);
return retval;
}
krb5_free_data(scratch);
if (retval = krb5_finish_key(&eblock)) {
xfree(tgsreq.authorization_data.ciphertext.data);
return retval;
}
}
#define cleanup_authdata() { if (tgsreq.authorization_data.ciphertext.data) {\
(void) memset(tgsreq.authorization_data.ciphertext.data, 0,\
tgsreq.authorization_data.ciphertext.length); \
xfree(tgsreq.authorization_data.ciphertext.data);}}
if (second_ticket) {
if (retval = decode_krb5_ticket(second_ticket, &sec_ticket)) {
cleanup_authdata();
return retval;
}
sec_ticket_arr[0] = sec_ticket;
sec_ticket_arr[1] = 0;
tgsreq.second_ticket = sec_ticket_arr;
} else
tgsreq.second_ticket = 0;
/* encode the body; then checksum it */
retval = encode_krb5_kdc_req_body(&tgsreq, &scratch);
if (retval) {
if (sec_ticket)
krb5_free_ticket(sec_ticket);
cleanup_authdata();
return(retval);
}
if (!(ap_checksum.contents = (krb5_octet *)
malloc(krb5_checksum_size(sumtype)))) {
if (sec_ticket)
krb5_free_ticket(sec_ticket);
krb5_free_data(scratch);
cleanup_authdata();
return ENOMEM;
}
if (retval = krb5_calculate_checksum(sumtype,
scratch->data,
scratch->length,
(krb5_pointer) usecred->keyblock.contents,
usecred->keyblock.length,
&ap_checksum)) {
if (sec_ticket)
krb5_free_ticket(sec_ticket);
xfree(ap_checksum.contents);
krb5_free_data(scratch);
cleanup_authdata();
return retval;
}
/* done with body */
krb5_free_data(scratch);
#define cleanup() {xfree(ap_checksum.contents);\
if (sec_ticket) krb5_free_ticket(sec_ticket);}
/* attach ap_req to the tgsreq */
/*
* Get an ap_req.
*/
if (retval = krb5_mk_req_extended (0L /* no ap options */,
&ap_checksum,
0L, /* don't need kdc_options for this */
0, /* no initial sequence */
0, /* no new key */
0, /* no ccache--already have creds */
usecred,
0, /* don't need authenticator */
&scratch2)) {
cleanup();
cleanup_authdata();
return retval;
}
ap_req_padata.pa_type = KRB5_PADATA_AP_REQ;
ap_req_padata.length = scratch2.length;
ap_req_padata.contents = (krb5_octet *)scratch2.data;
/* combine in any other supplied padata */
if (padata) {
krb5_pa_data * const * counter;
register int i = 0;
for (counter = padata; *counter; counter++, i++);
combined_padata = (krb5_pa_data **)malloc(i+2);
if (!combined_padata) {
cleanup();
cleanup_authdata();
xfree(ap_req_padata.contents);
return ENOMEM;
}
combined_padata[0] = &ap_req_padata;
for (i = 1, counter = padata; *counter; counter++, i++)
combined_padata[i] = (krb5_pa_data *) *counter;
combined_padata[i] = 0;
} else {
combined_padata = (krb5_pa_data **)malloc(2*sizeof(*combined_padata));
if (!combined_padata) {
cleanup();
cleanup_authdata();
xfree(ap_req_padata.contents);
return ENOMEM;
}
combined_padata[0] = &ap_req_padata;
combined_padata[1] = 0;
}
tgsreq.padata = combined_padata;
/* the TGS_REQ is assembled in tgsreq, so encode it */
if (retval = encode_krb5_tgs_req(&tgsreq, &scratch)) {
cleanup();
cleanup_authdata();
xfree(combined_padata);
xfree(ap_req_padata.contents);
return(retval);
}
if (sec_ticket)
krb5_free_ticket(sec_ticket);
cleanup_authdata();
xfree(combined_padata);
xfree(ap_req_padata.contents);
#undef cleanup_authdata
#undef cleanup
#define cleanup() {xfree(ap_checksum.contents);}
/* now send request & get response from KDC */
retval = krb5_sendto_kdc(scratch, krb5_princ_realm(sname),
&rep->response);
krb5_free_data(scratch);
cleanup();
if (retval) {
return retval;
}
#undef cleanup
if (krb5_is_tgs_rep(&rep->response))
rep->message_type = KRB5_TGS_REP;
else /* assume it's an error */
rep->message_type = KRB5_ERROR;
return 0;
}
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