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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/krb5/krb/mk_priv.c */
/*
* 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. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* 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.
*/
#include "k5-int.h"
#include "cleanup.h"
#include "auth_con.h"
static krb5_error_code
mk_priv_basic(krb5_context context, const krb5_data *userdata,
krb5_key key, krb5_replay_data *replaydata,
krb5_address *local_addr, krb5_address *remote_addr,
krb5_data *cstate, krb5_data *outbuf)
{
krb5_enctype enctype = krb5_k_key_enctype(context, key);
krb5_error_code retval;
krb5_priv privmsg;
krb5_priv_enc_part privmsg_enc_part;
krb5_data *scratch1, *scratch2;
size_t enclen;
privmsg.enc_part.kvno = 0; /* XXX allow user-set? */
privmsg.enc_part.enctype = enctype;
privmsg_enc_part.user_data = *userdata;
privmsg_enc_part.s_address = local_addr;
privmsg_enc_part.r_address = remote_addr;
/* We should check too make sure one exists. */
privmsg_enc_part.timestamp = replaydata->timestamp;
privmsg_enc_part.usec = replaydata->usec;
privmsg_enc_part.seq_number = replaydata->seq;
/* start by encoding to-be-encrypted part of the message */
if ((retval = encode_krb5_enc_priv_part(&privmsg_enc_part, &scratch1)))
return retval;
/* put together an eblock for this encryption */
if ((retval = krb5_c_encrypt_length(context, enctype,
scratch1->length, &enclen)))
goto clean_scratch;
privmsg.enc_part.ciphertext.length = enclen;
if (!(privmsg.enc_part.ciphertext.data =
malloc(privmsg.enc_part.ciphertext.length))) {
retval = ENOMEM;
goto clean_scratch;
}
if ((retval = krb5_k_encrypt(context, key,
KRB5_KEYUSAGE_KRB_PRIV_ENCPART,
(cstate->length > 0) ? cstate : NULL,
scratch1, &privmsg.enc_part)))
goto clean_encpart;
if ((retval = encode_krb5_priv(&privmsg, &scratch2)))
goto clean_encpart;
*outbuf = *scratch2;
free(scratch2);
retval = 0;
clean_encpart:
memset(privmsg.enc_part.ciphertext.data, 0,
privmsg.enc_part.ciphertext.length);
free(privmsg.enc_part.ciphertext.data);
privmsg.enc_part.ciphertext.length = 0;
privmsg.enc_part.ciphertext.data = 0;
clean_scratch:
memset(scratch1->data, 0, scratch1->length);
krb5_free_data(context, scratch1);
return retval;
}
krb5_error_code KRB5_CALLCONV
krb5_mk_priv(krb5_context context, krb5_auth_context auth_context,
const krb5_data *userdata, krb5_data *outbuf,
krb5_replay_data *outdata)
{
krb5_error_code retval;
krb5_key key;
krb5_replay_data replaydata;
krb5_data buf = empty_data();
*outbuf = empty_data();
/* Clear replaydata block */
memset(&replaydata, 0, sizeof(krb5_replay_data));
/* Get keyblock */
if ((key = auth_context->send_subkey) == NULL)
key = auth_context->key;
/* Get replay info */
if ((auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_DO_TIME) &&
(auth_context->rcache == NULL))
return KRB5_RC_REQUIRED;
if (((auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_RET_TIME) ||
(auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_RET_SEQUENCE)) &&
(outdata == NULL))
/* Need a better error */
return KRB5_RC_REQUIRED;
if (!auth_context->local_addr)
return KRB5_LOCAL_ADDR_REQUIRED;
if ((auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_DO_TIME) ||
(auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_RET_TIME)) {
if ((retval = krb5_us_timeofday(context, &replaydata.timestamp,
&replaydata.usec)))
return retval;
if (auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_RET_TIME) {
outdata->timestamp = replaydata.timestamp;
outdata->usec = replaydata.usec;
}
}
if ((auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) ||
(auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_RET_SEQUENCE)) {
replaydata.seq = auth_context->local_seq_number++;
if (auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_RET_SEQUENCE)
outdata->seq = replaydata.seq;
}
{
krb5_address * premote_fulladdr = NULL;
krb5_address * plocal_fulladdr;
krb5_address remote_fulladdr;
krb5_address local_fulladdr;
CLEANUP_INIT(2);
if (auth_context->local_port) {
if (!(retval = krb5_make_fulladdr(context, auth_context->local_addr,
auth_context->local_port,
&local_fulladdr))) {
CLEANUP_PUSH(local_fulladdr.contents, free);
plocal_fulladdr = &local_fulladdr;
} else {
goto error;
}
} else {
plocal_fulladdr = auth_context->local_addr;
}
if (auth_context->remote_addr) {
if (auth_context->remote_port) {
if (!(retval = krb5_make_fulladdr(context,auth_context->remote_addr,
auth_context->remote_port,
&remote_fulladdr))){
CLEANUP_PUSH(remote_fulladdr.contents, free);
premote_fulladdr = &remote_fulladdr;
} else {
CLEANUP_DONE();
goto error;
}
} else {
premote_fulladdr = auth_context->remote_addr;
}
}
if ((retval = mk_priv_basic(context, userdata, key, &replaydata,
plocal_fulladdr, premote_fulladdr,
&auth_context->cstate, &buf))) {
CLEANUP_DONE();
goto error;
}
CLEANUP_DONE();
}
if (auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_DO_TIME) {
krb5_donot_replay replay;
if ((retval = krb5_gen_replay_name(context, auth_context->local_addr,
"_priv", &replay.client)))
goto error;
replay.server = ""; /* XXX */
replay.msghash = NULL;
replay.cusec = replaydata.usec;
replay.ctime = replaydata.timestamp;
if ((retval = krb5_rc_store(context, auth_context->rcache, &replay))) {
/* should we really error out here? XXX */
free(replay.client);
goto error;
}
free(replay.client);
}
*outbuf = buf;
return 0;
error:
krb5_free_data_contents(context, &buf);
if ((auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) ||
(auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_RET_SEQUENCE))
auth_context->local_seq_number--;
return retval;
}
|
