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/*
* lib/krb5/krb/gc_2tgt.c
*
* Copyright 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.
*
*
* Given two tgts, get a ticket.
*/
#include <krb5/krb5.h>
#include <krb5/asn1.h> /* needed for some macros */
#include <krb5/los-proto.h>
#include <krb5/ext-proto.h>
#include "int-proto.h"
krb5_error_code INTERFACE
krb5_get_cred_via_2tgt (context, tgt, kdcoptions, sumtype, in_cred, out_cred)
krb5_context context;
krb5_creds *tgt;
const krb5_flags kdcoptions;
const krb5_cksumtype sumtype;
krb5_creds * in_cred;
krb5_creds ** out_cred;
{
krb5_error_code retval;
#if 0
krb5_principal tempprinc;
#endif
krb5_data *scratch;
krb5_kdc_rep *dec_rep;
krb5_error *err_reply;
krb5_response tgsrep;
krb5_enctype etype;
/* tgt->client must be equal to in_cred->client */
/* tgt->server must be equal to krbtgt/realmof(cred->client) */
if (!krb5_principal_compare(context, tgt->client, in_cred->client))
return KRB5_PRINC_NOMATCH;
if (!tgt->ticket.length)
return(KRB5_NO_TKT_SUPPLIED);
if (!in_cred->second_ticket.length)
return(KRB5_NO_2ND_TKT);
#if 0 /* What does this do? */
if (retval = krb5_tgtname(context, krb5_princ_realm(in_cred->server),
krb5_princ_realm(context, in_cred->client), &tempprinc))
return(retval);
if (!krb5_principal_compare(context, tempprinc, tgt->server)) {
krb5_free_principal(context, tempprinc);
return KRB5_PRINC_NOMATCH;
}
krb5_free_principal(context, tempprinc);
#endif
if (!(kdcoptions & KDC_OPT_ENC_TKT_IN_SKEY))
return KRB5_INVALID_FLAGS;
if (retval = krb5_send_tgs(context, kdcoptions, &in_cred->times, NULL,
sumtype, in_cred->server, tgt->addresses,
in_cred->authdata,
0, /* no padata */
&in_cred->second_ticket, tgt, &tgsrep))
return retval;
if (tgsrep.message_type != KRB5_TGS_REP)
{
if (!krb5_is_krb_error(&tgsrep.response)) {
free(tgsrep.response.data);
return KRB5KRB_AP_ERR_MSG_TYPE;
}
retval = decode_krb5_error(&tgsrep.response, &err_reply);
if (retval) {
free(tgsrep.response.data);
return retval;
}
retval = err_reply->error + ERROR_TABLE_BASE_krb5;
krb5_free_error(context, err_reply);
free(tgsrep.response.data);
return retval;
}
etype = tgt->keyblock.etype;
retval = krb5_decode_kdc_rep(context, &tgsrep.response, &tgt->keyblock,
etype, &dec_rep);
free(tgsrep.response.data);
if (retval)
return retval;
if (dec_rep->msg_type != KRB5_TGS_REP) {
retval = KRB5KRB_AP_ERR_MSG_TYPE;
goto errout;
}
/* now it's decrypted and ready for prime time */
if (!krb5_principal_compare(context, dec_rep->client, tgt->client)) {
retval = KRB5_KDCREP_MODIFIED;
goto errout;
}
/*
* get a cred structure
* The caller is responsible for cleaning up
*/
if (((*out_cred) = (krb5_creds *)malloc(sizeof(krb5_creds))) == NULL) {
retval = ENOMEM;
goto errout;
}
/* Copy the client straig from in_cred */
if (retval = krb5_copy_principal(context, in_cred->client,
&(*out_cred)->client)) {
goto errout;
}
/* put pieces into out_cred-> */
(*out_cred)->keyblock.magic = KV5M_KEYBLOCK;
(*out_cred)->keyblock.etype = dec_rep->ticket->enc_part.etype;
if (retval = krb5_copy_keyblock_contents(context,
dec_rep->enc_part2->session,
&(*out_cred)->keyblock))
goto errout;
/* Should verify that the ticket is what we asked for. */
(*out_cred)->times = dec_rep->enc_part2->times;
(*out_cred)->ticket_flags = dec_rep->enc_part2->flags;
(*out_cred)->is_skey = TRUE;
if (dec_rep->enc_part2->caddrs)
retval = krb5_copy_addresses(context, dec_rep->enc_part2->caddrs,
&(*out_cred)->addresses);
else
/* no addresses in the list means we got what we had */
retval = krb5_copy_addresses(context, tgt->addresses, &(*out_cred)->addresses);
if (retval)
goto errout;
if (retval = krb5_copy_principal(context, dec_rep->enc_part2->server,
&(*out_cred)->server))
goto errout;
if (retval = encode_krb5_ticket(dec_rep->ticket, &scratch))
goto errout;
(*out_cred)->ticket = *scratch;
krb5_xfree(scratch);
errout:
if (retval) {
if (*out_cred) {
if ((*out_cred)->keyblock.contents) {
memset((*out_cred)->keyblock.contents, 0,
(*out_cred)->keyblock.length);
krb5_xfree((*out_cred)->keyblock.contents);
(*out_cred)->keyblock.contents = 0;
}
if ((*out_cred)->addresses) {
krb5_free_addresses(context, (*out_cred)->addresses);
(*out_cred)->addresses = 0;
}
if ((*out_cred)->server) {
krb5_free_principal(context, (*out_cred)->server);
(*out_cred)->server = 0;
}
krb5_free_creds(context, *out_cred);
}
}
memset((char *)dec_rep->enc_part2->session->contents, 0,
dec_rep->enc_part2->session->length);
krb5_free_kdc_rep(context, dec_rep);
return retval;
}
/*
* Local variables:
* mode:c
* eval: (make-local-variable (quote c-indent-level))
* eval: (make-local-variable (quote c-continued-statement-offset))
* eval: (setq c-indent-level 4 c-continued-statement-offset 4)
* End:
*/
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