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/*
* lib/krb5/krb/get_in_tkt.c
*
* Copyright 1995 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.
*/
#define NEED_SOCKETS
#include "k5-int.h"
#include <memory.h>
/* helper function: convert flags to necessary KDC options */
#define flags2options(flags) (flags & KDC_TKT_COMMON_MASK)
/* Get a TGT for use at the remote host */
krb5_error_code
krb5_fwd_tgt_creds(context, auth_context, rhost, client, server, cc,
forwardable, outbuf)
krb5_context context;
krb5_auth_context auth_context;
char *rhost;
krb5_principal client;
krb5_principal server;
krb5_ccache cc;
int forwardable; /* Should forwarded TGT also be forwardable? */
krb5_data *outbuf;
{
krb5_replay_data replaydata;
krb5_data * scratch = 0;
krb5_address **addrs = 0;
krb5_error_code retval;
krb5_creds creds, tgt;
krb5_creds *pcreds;
krb5_flags kdcoptions;
int close_cc = 0;
int free_rhost = 0;
memset((char *)&creds, 0, sizeof(creds));
memset((char *)&tgt, 0, sizeof(creds));
if (rhost == NULL) {
if (krb5_princ_type(context, server) != KRB5_NT_SRV_HST)
return(KRB5_FWD_BAD_PRINCIPAL);
if (krb5_princ_size(context, server) < 2)
return (KRB5_CC_BADNAME);
rhost = malloc(server->data[1].length+1);
if (!rhost)
return ENOMEM;
free_rhost = 1;
memcpy(rhost, server->data[1].data, server->data[1].length);
rhost[server->data[1].length] = '\0';
}
retval = krb5_os_hostaddr(context, rhost, &addrs);
if (retval)
goto errout;
if ((retval = krb5_copy_principal(context, client, &creds.client)))
goto errout;
if ((retval = krb5_build_principal_ext(context, &creds.server,
server->realm.length,
server->realm.data,
KRB5_TGS_NAME_SIZE,
KRB5_TGS_NAME,
client->realm.length,
client->realm.data,
0)))
goto errout;
if (cc == 0) {
if ((retval = krb5_cc_default(context, &cc)))
goto errout;
close_cc = 1;
}
/* fetch tgt directly from cache */
retval = krb5_cc_retrieve_cred (context, cc, KRB5_TC_MATCH_SRV_NAMEONLY,
&creds, &tgt);
if (retval)
goto errout;
/* tgt->client must be equal to creds.client */
if (!krb5_principal_compare(context, tgt.client, creds.client)) {
retval = KRB5_PRINC_NOMATCH;
goto errout;
}
if (!tgt.ticket.length) {
retval = KRB5_NO_TKT_SUPPLIED;
goto errout;
}
creds.times = tgt.times;
creds.times.starttime = 0;
kdcoptions = flags2options(tgt.ticket_flags)|KDC_OPT_FORWARDED;
if (!forwardable) /* Reset KDC_OPT_FORWARDABLE */
kdcoptions &= ~(KDC_OPT_FORWARDABLE);
if ((retval = krb5_get_cred_via_tkt(context, &tgt, kdcoptions,
addrs, &creds, &pcreds)))
goto errout;
retval = krb5_mk_1cred(context, auth_context, pcreds,
&scratch, &replaydata);
krb5_free_creds(context, pcreds);
if (retval) {
if (scratch)
krb5_free_data(context, scratch);
} else {
*outbuf = *scratch;
krb5_xfree(scratch);
}
errout:
if (addrs)
krb5_free_addresses(context, addrs);
if (close_cc)
krb5_cc_close(context, cc);
if (free_rhost)
free(rhost);
krb5_free_cred_contents(context, &creds);
krb5_free_cred_contents(context, &tgt);
return retval;
}
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