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/*
* 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.
*
*
* krb5_mk_priv()
*/
#include "k5-int.h"
#include "cleanup.h"
#include "auth_con.h"
static krb5_error_code
krb5_mk_priv_basic(context, userdata, keyblock, replaydata, local_addr,
remote_addr, i_vector, outbuf)
krb5_context context;
const krb5_data * userdata;
const krb5_keyblock * keyblock;
krb5_replay_data * replaydata;
krb5_address * local_addr;
krb5_address * remote_addr;
krb5_pointer i_vector;
krb5_data * outbuf;
{
krb5_error_code retval;
krb5_priv privmsg;
krb5_priv_enc_part privmsg_enc_part;
krb5_data *scratch1, *scratch2, ivdata;
size_t blocksize, enclen;
privmsg.enc_part.kvno = 0; /* XXX allow user-set? */
privmsg.enc_part.enctype = keyblock->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, keyblock->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;
}
/* call the encryption routine */
if (i_vector) {
if ((retval = krb5_c_block_size(context, keyblock->enctype,
&blocksize)))
goto clean_encpart;
ivdata.length = blocksize;
ivdata.data = i_vector;
}
if ((retval = krb5_c_encrypt(context, keyblock,
KRB5_KEYUSAGE_KRB_PRIV_ENCPART,
i_vector?&ivdata:0,
scratch1, &privmsg.enc_part)))
goto clean_encpart;
if ((retval = encode_krb5_priv(&privmsg, &scratch2)))
goto clean_encpart;
*outbuf = *scratch2;
krb5_xfree(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(context, auth_context, userdata, outbuf, outdata)
krb5_context context;
krb5_auth_context auth_context;
const krb5_data * userdata;
krb5_data * outbuf;
krb5_replay_data * outdata;
{
krb5_error_code retval;
krb5_keyblock * keyblock;
krb5_replay_data replaydata;
/* Clear replaydata block */
memset((char *) &replaydata, 0, sizeof(krb5_replay_data));
/* Get keyblock */
if ((keyblock = auth_context->local_subkey) == NULL)
if ((keyblock = auth_context->remote_subkey) == NULL)
keyblock = auth_context->keyblock;
/* 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->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_DO_SEQUENCE) {
auth_context->local_seq_number++;
} else {
outdata->seq = replaydata.seq;
}
}
{
krb5_address * premote_fulladdr = NULL;
krb5_address * plocal_fulladdr = NULL;
krb5_address remote_fulladdr;
krb5_address local_fulladdr;
CLEANUP_INIT(2);
if (auth_context->local_addr) {
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 = krb5_mk_priv_basic(context, userdata, keyblock, &replaydata,
plocal_fulladdr, premote_fulladdr,
auth_context->i_vector, outbuf))) {
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))) {
krb5_xfree(outbuf);
goto error;
}
replay.server = ""; /* XXX */
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 */
krb5_xfree(replay.client);
goto error;
}
krb5_xfree(replay.client);
}
return 0;
error:
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;
}
|
