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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/krb5/krb/ser_actx.c - Serialize krb5_auth_context structure */
/*
* Copyright 1995, 2008 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 "int-proto.h"
#include "auth_con.h"
#define TOKEN_RADDR 950916
#define TOKEN_RPORT 950917
#define TOKEN_LADDR 950918
#define TOKEN_LPORT 950919
#define TOKEN_KEYBLOCK 950920
#define TOKEN_LSKBLOCK 950921
#define TOKEN_RSKBLOCK 950922
/*
* Routines to deal with externalizing the krb5_auth_context:
* krb5_auth_context_size();
* krb5_auth_context_externalize();
* krb5_auth_context_internalize();
*/
static krb5_error_code krb5_auth_context_size
(krb5_context, krb5_pointer, size_t *);
static krb5_error_code krb5_auth_context_externalize
(krb5_context, krb5_pointer, krb5_octet **, size_t *);
static krb5_error_code krb5_auth_context_internalize
(krb5_context,krb5_pointer *, krb5_octet **, size_t *);
/*
* Other metadata serialization initializers.
*/
/* Local data */
static const krb5_ser_entry krb5_auth_context_ser_entry = {
KV5M_AUTH_CONTEXT, /* Type */
krb5_auth_context_size, /* Sizer routine */
krb5_auth_context_externalize, /* Externalize routine */
krb5_auth_context_internalize /* Internalize routine */
};
/*
* krb5_auth_context_size() - Determine the size required to externalize
* the krb5_auth_context.
*/
static krb5_error_code
krb5_auth_context_size(krb5_context kcontext, krb5_pointer arg, size_t *sizep)
{
krb5_error_code kret;
krb5_auth_context auth_context;
size_t required;
/*
* krb5_auth_context requires at minimum:
* krb5_int32 for KV5M_AUTH_CONTEXT
* krb5_int32 for auth_context_flags
* krb5_int32 for remote_seq_number
* krb5_int32 for local_seq_number
* krb5_int32 for req_cksumtype
* krb5_int32 for safe_cksumtype
* krb5_int32 for size of i_vector
* krb5_int32 for KV5M_AUTH_CONTEXT
*/
kret = EINVAL;
if ((auth_context = (krb5_auth_context) arg)) {
kret = 0;
required = auth_context->cstate.length;
required += sizeof(krb5_int32)*8;
/* Calculate size required by remote_addr, if appropriate */
if (!kret && auth_context->remote_addr) {
kret = krb5_size_opaque(kcontext,
KV5M_ADDRESS,
(krb5_pointer) auth_context->remote_addr,
&required);
if (!kret)
required += sizeof(krb5_int32);
}
/* Calculate size required by remote_port, if appropriate */
if (!kret && auth_context->remote_port) {
kret = krb5_size_opaque(kcontext,
KV5M_ADDRESS,
(krb5_pointer) auth_context->remote_port,
&required);
if (!kret)
required += sizeof(krb5_int32);
}
/* Calculate size required by local_addr, if appropriate */
if (!kret && auth_context->local_addr) {
kret = krb5_size_opaque(kcontext,
KV5M_ADDRESS,
(krb5_pointer) auth_context->local_addr,
&required);
if (!kret)
required += sizeof(krb5_int32);
}
/* Calculate size required by local_port, if appropriate */
if (!kret && auth_context->local_port) {
kret = krb5_size_opaque(kcontext,
KV5M_ADDRESS,
(krb5_pointer) auth_context->local_port,
&required);
if (!kret)
required += sizeof(krb5_int32);
}
/* Calculate size required by key, if appropriate */
if (!kret && auth_context->key) {
kret = krb5_size_opaque(kcontext,
KV5M_KEYBLOCK, (krb5_pointer)
&auth_context->key->keyblock,
&required);
if (!kret)
required += sizeof(krb5_int32);
}
/* Calculate size required by send_subkey, if appropriate */
if (!kret && auth_context->send_subkey) {
kret = krb5_size_opaque(kcontext,
KV5M_KEYBLOCK, (krb5_pointer)
&auth_context->send_subkey->keyblock,
&required);
if (!kret)
required += sizeof(krb5_int32);
}
/* Calculate size required by recv_subkey, if appropriate */
if (!kret && auth_context->recv_subkey) {
kret = krb5_size_opaque(kcontext,
KV5M_KEYBLOCK, (krb5_pointer)
&auth_context->recv_subkey->keyblock,
&required);
if (!kret)
required += sizeof(krb5_int32);
}
/* Calculate size required by authentp, if appropriate */
if (!kret && auth_context->authentp)
kret = krb5_size_opaque(kcontext,
KV5M_AUTHENTICATOR,
(krb5_pointer) auth_context->authentp,
&required);
}
if (!kret)
*sizep += required;
return(kret);
}
/*
* krb5_auth_context_externalize() - Externalize the krb5_auth_context.
*/
static krb5_error_code
krb5_auth_context_externalize(krb5_context kcontext, krb5_pointer arg, krb5_octet **buffer, size_t *lenremain)
{
krb5_error_code kret;
krb5_auth_context auth_context;
size_t required;
krb5_octet *bp;
size_t remain;
required = 0;
bp = *buffer;
remain = *lenremain;
kret = EINVAL;
if ((auth_context = (krb5_auth_context) arg)) {
kret = ENOMEM;
if (!krb5_auth_context_size(kcontext, arg, &required) &&
(required <= remain)) {
/* Write fixed portion */
(void) krb5_ser_pack_int32(KV5M_AUTH_CONTEXT, &bp, &remain);
(void) krb5_ser_pack_int32(auth_context->auth_context_flags,
&bp, &remain);
(void) krb5_ser_pack_int32(auth_context->remote_seq_number,
&bp, &remain);
(void) krb5_ser_pack_int32(auth_context->local_seq_number,
&bp, &remain);
(void) krb5_ser_pack_int32((krb5_int32) auth_context->req_cksumtype,
&bp, &remain);
(void) krb5_ser_pack_int32((krb5_int32) auth_context->safe_cksumtype,
&bp, &remain);
/* Write the cipher state */
(void) krb5_ser_pack_int32(auth_context->cstate.length, &bp,
&remain);
(void) krb5_ser_pack_bytes((krb5_octet *)auth_context->cstate.data,
auth_context->cstate.length,
&bp, &remain);
kret = 0;
/* Now handle remote_addr, if appropriate */
if (!kret && auth_context->remote_addr) {
(void) krb5_ser_pack_int32(TOKEN_RADDR, &bp, &remain);
kret = krb5_externalize_opaque(kcontext,
KV5M_ADDRESS,
(krb5_pointer)
auth_context->remote_addr,
&bp,
&remain);
}
/* Now handle remote_port, if appropriate */
if (!kret && auth_context->remote_port) {
(void) krb5_ser_pack_int32(TOKEN_RPORT, &bp, &remain);
kret = krb5_externalize_opaque(kcontext,
KV5M_ADDRESS,
(krb5_pointer)
auth_context->remote_addr,
&bp,
&remain);
}
/* Now handle local_addr, if appropriate */
if (!kret && auth_context->local_addr) {
(void) krb5_ser_pack_int32(TOKEN_LADDR, &bp, &remain);
kret = krb5_externalize_opaque(kcontext,
KV5M_ADDRESS,
(krb5_pointer)
auth_context->local_addr,
&bp,
&remain);
}
/* Now handle local_port, if appropriate */
if (!kret && auth_context->local_port) {
(void) krb5_ser_pack_int32(TOKEN_LPORT, &bp, &remain);
kret = krb5_externalize_opaque(kcontext,
KV5M_ADDRESS,
(krb5_pointer)
auth_context->local_addr,
&bp,
&remain);
}
/* Now handle keyblock, if appropriate */
if (!kret && auth_context->key) {
(void) krb5_ser_pack_int32(TOKEN_KEYBLOCK, &bp, &remain);
kret = krb5_externalize_opaque(kcontext,
KV5M_KEYBLOCK,
(krb5_pointer)
&auth_context->key->keyblock,
&bp,
&remain);
}
/* Now handle subkey, if appropriate */
if (!kret && auth_context->send_subkey) {
(void) krb5_ser_pack_int32(TOKEN_LSKBLOCK, &bp, &remain);
kret = krb5_externalize_opaque(kcontext,
KV5M_KEYBLOCK,
(krb5_pointer) &auth_context->
send_subkey->keyblock,
&bp,
&remain);
}
/* Now handle subkey, if appropriate */
if (!kret && auth_context->recv_subkey) {
(void) krb5_ser_pack_int32(TOKEN_RSKBLOCK, &bp, &remain);
kret = krb5_externalize_opaque(kcontext,
KV5M_KEYBLOCK,
(krb5_pointer) &auth_context->
recv_subkey->keyblock,
&bp,
&remain);
}
/* Now handle authentp, if appropriate */
if (!kret && auth_context->authentp)
kret = krb5_externalize_opaque(kcontext,
KV5M_AUTHENTICATOR,
(krb5_pointer)
auth_context->authentp,
&bp,
&remain);
/*
* If we were successful, write trailer then update the pointer and
* remaining length;
*/
if (!kret) {
/* Write our trailer */
(void) krb5_ser_pack_int32(KV5M_AUTH_CONTEXT, &bp, &remain);
*buffer = bp;
*lenremain = remain;
}
}
}
return(kret);
}
/* Internalize a keyblock and convert it to a key. */
static krb5_error_code
intern_key(krb5_context ctx, krb5_key *key, krb5_octet **bp, size_t *sp)
{
krb5_keyblock *keyblock;
krb5_error_code ret;
ret = krb5_internalize_opaque(ctx, KV5M_KEYBLOCK,
(krb5_pointer *) &keyblock, bp, sp);
if (ret != 0)
return ret;
ret = krb5_k_create_key(ctx, keyblock, key);
krb5_free_keyblock(ctx, keyblock);
return ret;
}
/*
* krb5_auth_context_internalize() - Internalize the krb5_auth_context.
*/
static krb5_error_code
krb5_auth_context_internalize(krb5_context kcontext, krb5_pointer *argp, krb5_octet **buffer, size_t *lenremain)
{
krb5_error_code kret;
krb5_auth_context auth_context;
krb5_int32 ibuf;
krb5_octet *bp;
size_t remain;
krb5_int32 cstate_len;
krb5_int32 tag;
bp = *buffer;
remain = *lenremain;
kret = EINVAL;
/* Read our magic number */
if (krb5_ser_unpack_int32(&ibuf, &bp, &remain))
ibuf = 0;
if (ibuf == KV5M_AUTH_CONTEXT) {
kret = ENOMEM;
/* Get memory for the auth_context */
if ((remain >= (5*sizeof(krb5_int32))) &&
(auth_context = (krb5_auth_context)
calloc(1, sizeof(struct _krb5_auth_context)))) {
/* Get auth_context_flags */
(void) krb5_ser_unpack_int32(&ibuf, &bp, &remain);
auth_context->auth_context_flags = ibuf;
/* Get remote_seq_number */
(void) krb5_ser_unpack_int32(&ibuf, &bp, &remain);
auth_context->remote_seq_number = ibuf;
/* Get local_seq_number */
(void) krb5_ser_unpack_int32(&ibuf, &bp, &remain);
auth_context->local_seq_number = ibuf;
/* Get req_cksumtype */
(void) krb5_ser_unpack_int32(&ibuf, &bp, &remain);
auth_context->req_cksumtype = (krb5_cksumtype) ibuf;
/* Get safe_cksumtype */
(void) krb5_ser_unpack_int32(&ibuf, &bp, &remain);
auth_context->safe_cksumtype = (krb5_cksumtype) ibuf;
/* Get length of cstate */
(void) krb5_ser_unpack_int32(&cstate_len, &bp, &remain);
if (cstate_len) {
kret = alloc_data(&auth_context->cstate, cstate_len);
if (!kret) {
kret = krb5_ser_unpack_bytes((krb5_octet *)
auth_context->cstate.data,
cstate_len, &bp, &remain);
}
}
else
kret = 0;
/* Peek at next token */
tag = 0;
if (!kret)
kret = krb5_ser_unpack_int32(&tag, &bp, &remain);
/* This is the remote_addr */
if (!kret && (tag == TOKEN_RADDR)) {
if (!(kret = krb5_internalize_opaque(kcontext,
KV5M_ADDRESS,
(krb5_pointer *)
&auth_context->
remote_addr,
&bp,
&remain)))
kret = krb5_ser_unpack_int32(&tag, &bp, &remain);
}
/* This is the remote_port */
if (!kret && (tag == TOKEN_RPORT)) {
if (!(kret = krb5_internalize_opaque(kcontext,
KV5M_ADDRESS,
(krb5_pointer *)
&auth_context->
remote_port,
&bp,
&remain)))
kret = krb5_ser_unpack_int32(&tag, &bp, &remain);
}
/* This is the local_addr */
if (!kret && (tag == TOKEN_LADDR)) {
if (!(kret = krb5_internalize_opaque(kcontext,
KV5M_ADDRESS,
(krb5_pointer *)
&auth_context->
local_addr,
&bp,
&remain)))
kret = krb5_ser_unpack_int32(&tag, &bp, &remain);
}
/* This is the local_port */
if (!kret && (tag == TOKEN_LPORT)) {
if (!(kret = krb5_internalize_opaque(kcontext,
KV5M_ADDRESS,
(krb5_pointer *)
&auth_context->
local_port,
&bp,
&remain)))
kret = krb5_ser_unpack_int32(&tag, &bp, &remain);
}
/* This is the keyblock */
if (!kret && (tag == TOKEN_KEYBLOCK)) {
if (!(kret = intern_key(kcontext,
&auth_context->key,
&bp,
&remain)))
kret = krb5_ser_unpack_int32(&tag, &bp, &remain);
}
/* This is the send_subkey */
if (!kret && (tag == TOKEN_LSKBLOCK)) {
if (!(kret = intern_key(kcontext,
&auth_context->send_subkey,
&bp,
&remain)))
kret = krb5_ser_unpack_int32(&tag, &bp, &remain);
}
/* This is the recv_subkey */
if (!kret) {
if (tag == TOKEN_RSKBLOCK) {
kret = intern_key(kcontext,
&auth_context->recv_subkey,
&bp,
&remain);
}
else {
/*
* We read the next tag, but it's not of any use here, so
* we effectively 'unget' it here.
*/
bp -= sizeof(krb5_int32);
remain += sizeof(krb5_int32);
}
}
/* Now find the authentp */
if (!kret) {
if ((kret = krb5_internalize_opaque(kcontext,
KV5M_AUTHENTICATOR,
(krb5_pointer *)
&auth_context->authentp,
&bp,
&remain))) {
if (kret == EINVAL)
kret = 0;
}
}
/* Finally, find the trailer */
if (!kret) {
kret = krb5_ser_unpack_int32(&ibuf, &bp, &remain);
if (!kret && (ibuf != KV5M_AUTH_CONTEXT))
kret = EINVAL;
}
if (!kret) {
*buffer = bp;
*lenremain = remain;
auth_context->magic = KV5M_AUTH_CONTEXT;
*argp = (krb5_pointer) auth_context;
}
else
krb5_auth_con_free(kcontext, auth_context);
}
}
return(kret);
}
/*
* Register the auth_context serializer.
*/
krb5_error_code KRB5_CALLCONV
krb5_ser_auth_context_init(krb5_context kcontext)
{
krb5_error_code kret;
kret = krb5_register_serializer(kcontext, &krb5_auth_context_ser_entry);
if (!kret)
kret = krb5_ser_authdata_init(kcontext);
if (!kret)
kret = krb5_ser_address_init(kcontext);
#ifndef LEAN_CLIENT
if (!kret)
kret = krb5_ser_authenticator_init(kcontext);
#endif
if (!kret)
kret = krb5_ser_checksum_init(kcontext);
if (!kret)
kret = krb5_ser_keyblock_init(kcontext);
if (!kret)
kret = krb5_ser_principal_init(kcontext);
if (!kret)
kret = krb5_ser_authdata_context_init(kcontext);
return(kret);
}
|
