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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_mk_safe()
*/
#if !defined(lint) && !defined(SABER)
static char rcsid_mk_safe_c[] =
"$Id$";
#endif /* !lint & !SABER */
#include <krb5/krb5.h>
#include <krb5/asn1.h>
#include <krb5/los-proto.h>
#include <krb5/ext-proto.h>
/*
Formats a KRB_SAFE message into outbuf.
userdata is formatted as the user data in the message.
sumtype specifies the encryption type; key specifies the key which
might be used to seed the checksum; sender_addr and recv_addr specify
the full addresses (host and port) of the sender and receiver.
The host portion of sender_addr is used to form the addresses used in the
KRB_SAFE message.
The outbuf buffer storage is allocated, and should be freed by the
caller when finished.
returns system errors
*/
krb5_error_code
krb5_mk_safe(DECLARG(const krb5_data *, userdata),
DECLARG(const krb5_cksumtype, sumtype),
DECLARG(const krb5_keyblock *, key),
DECLARG(const krb5_address *, sender_addr),
DECLARG(const krb5_address *, recv_addr),
DECLARG(krb5_int32, seq_number),
DECLARG(krb5_int32, safe_flags),
DECLARG(krb5_rcache, rcache),
DECLARG(krb5_data *, outbuf))
OLDDECLARG(const krb5_data *, userdata)
OLDDECLARG(const krb5_cksumtype, sumtype)
OLDDECLARG(const krb5_keyblock *, key)
OLDDECLARG(const krb5_address *, sender_addr)
OLDDECLARG(const krb5_address *, recv_addr)
OLDDECLARG(krb5_int32, seq_number)
OLDDECLARG(krb5_int32, safe_flags)
OLDDECLARG(krb5_rcache, rcache)
OLDDECLARG(krb5_data *, outbuf)
{
krb5_error_code retval;
krb5_safe safemsg;
krb5_octet zero_octet = 0;
krb5_checksum safe_checksum;
krb5_data *scratch;
if (!valid_cksumtype(sumtype))
return KRB5_PROG_SUMTYPE_NOSUPP;
if (!is_coll_proof_cksum(sumtype) || !is_keyed_cksum(sumtype))
return KRB5KRB_AP_ERR_INAPP_CKSUM;
safemsg.user_data = *userdata;
safemsg.s_address = (krb5_address *)sender_addr;
if (recv_addr)
safemsg.r_address = (krb5_address *)recv_addr;
else
safemsg.r_address = 0;
if (!(safe_flags & KRB5_SAFE_NOTIME)) {
if (!rcache)
/* gotta provide an rcache in this case... */
return KRB5_RC_REQUIRED;
if (retval = krb5_us_timeofday(&safemsg.timestamp, &safemsg.usec))
return retval;
} else
safemsg.timestamp = 0, safemsg.usec = 0;
if (safe_flags & KRB5_SAFE_DOSEQUENCE) {
safemsg.seq_number = seq_number;
} else
safemsg.seq_number = 0;
/* to do the checksum stuff, we need to encode the message with a
zero-length zero-type checksum, then checksum the encoding, then
re-encode with the
checksum. */
safe_checksum.checksum_type = 0;
safe_checksum.length = 0;
safe_checksum.contents = &zero_octet;
safemsg.checksum = &safe_checksum;
if (retval = encode_krb5_safe(&safemsg, &scratch))
return retval;
#define clean_scratch() {(void) memset((char *)scratch->data, 0,\
scratch->length); \
krb5_free_data(scratch);}
if (!(safe_checksum.contents =
(krb5_octet *) malloc(krb5_checksum_size(sumtype)))) {
clean_scratch();
return ENOMEM;
}
if (retval = krb5_calculate_checksum(sumtype, scratch->data,
scratch->length,
(krb5_pointer) key->contents,
key->length, &safe_checksum)) {
krb5_xfree(safe_checksum.contents);
clean_scratch();
return retval;
}
safemsg.checksum = &safe_checksum;
clean_scratch();
if (retval = encode_krb5_safe(&safemsg, &scratch)) {
krb5_xfree(safe_checksum.contents);
return retval;
}
krb5_xfree(safe_checksum.contents);
if (!(safe_flags & KRB5_SAFE_NOTIME)) {
krb5_donot_replay replay;
if (retval = krb5_gen_replay_name(sender_addr, "_safe",
&replay.client)) {
clean_scratch();
return retval;
}
replay.server = ""; /* XXX */
replay.cusec = safemsg.usec;
replay.ctime = safemsg.timestamp;
if (retval = krb5_rc_store(rcache, &replay)) {
/* should we really error out here? XXX */
clean_scratch();
krb5_xfree(replay.client);
return retval;
}
krb5_xfree(replay.client);
}
*outbuf = *scratch;
krb5_xfree(scratch);
return 0;
}
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