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# spnego.cnf
# spnego conformation file
#.EXPORTS
#.PDU
#.NO_EMIT ONLY_VALS
NegotiationToken
#.FN_BODY NegotiationToken/negTokenInit
gboolean is_response = actx->pinfo->ptype == PT_TCP &&
actx->pinfo->srcport < 1024;
/*
* We decode as negTokenInit2 or negTokenInit depending on whether or not
* we are in a response or a request. That is essentially what MS-SPNG
* says.
*/
if (is_response) {
return dissect_spnego_NegTokenInit2(%(IMPLICIT_TAG)s, %(TVB)s, %(OFFSET)s,
%(ACTX)s, %(TREE)s, %(HF_INDEX)s);
} else {
return dissect_spnego_NegTokenInit(%(IMPLICIT_TAG)s, %(TVB)s, %(OFFSET)s,
%(ACTX)s, %(TREE)s, %(HF_INDEX)s);
}
#.FN_PARS MechType
FN_VARIANT = _str VAL_PTR = &MechType_oid
#.FN_BODY MechType
gssapi_oid_value *value;
%(DEFAULT_BODY)s
value = gssapi_lookup_oid_str(MechType_oid);
/*
* Tell our caller the first mechanism we see, so that if
* this is a negTokenInit with a mechToken, it can interpret
* the mechToken according to the first mechType. (There
* might not have been any indication of the mechType
* in prior frames, so we can't necessarily use the
* mechanism from the conversation; i.e., a negTokenInit
* can contain the initial security token for the desired
* mechanism of the initiator - that's the first mechanism
* in the list.)
*/
if (!saw_mechanism) {
if (value)
next_level_value = value;
saw_mechanism = TRUE;
}
#.FN_BODY InnerContextToken
gssapi_oid_value *next_level_value_lcl;
proto_item *item;
proto_tree *subtree;
tvbuff_t *token_tvb;
int len;
/*
* XXX - what should we do if this OID doesn't match the value
* attached to the frame or conversation? (That would be
* bogus, but that's not impossible - some broken implementation
* might negotiate some security mechanism but put the OID
* for some other security mechanism in GSS_Wrap tokens.)
* Does it matter?
*/
next_level_value_lcl = gssapi_lookup_oid_str(MechType_oid);
/*
* Now dissect the GSS_Wrap token; it's assumed to be in the
* rest of the tvbuff.
*/
item = proto_tree_add_item(tree, hf_spnego_wraptoken, tvb, offset, -1, ENC_NA);
subtree = proto_item_add_subtree(item, ett_spnego_wraptoken);
/*
* Now, we should be able to dispatch after creating a new TVB.
* The subdissector must return the length of the part of the
* token it dissected, so we can return the length of the part
* we (and it) dissected.
*/
token_tvb = tvb_new_subset_remaining(tvb, offset);
if (next_level_value_lcl && next_level_value_lcl->wrap_handle) {
len = call_dissector(next_level_value_lcl->wrap_handle, token_tvb, actx->pinfo,
subtree);
if (len == 0)
offset = tvb_reported_length(tvb);
else
offset = offset + len;
} else
offset = tvb_reported_length(tvb);
#.FN_BODY MechTypeList
conversation_t *conversation;
saw_mechanism = FALSE;
%(DEFAULT_BODY)s
/*
* If we saw a mechType we need to store it in case the negTokenTarg
* does not provide a supportedMech.
*/
if(saw_mechanism){
conversation = find_or_create_conversation(actx->pinfo);
conversation_add_proto_data(conversation, proto_spnego, next_level_value);
}
#.FN_PARS NegTokenInit/mechToken
VAL_PTR = &mechToken_tvb
#.FN_BODY NegTokenInit/mechToken
tvbuff_t *mechToken_tvb = NULL;
%(DEFAULT_BODY)s
/*
* Now, we should be able to dispatch, if we've gotten a tvbuff for
* the token and we have information on how to dissect its contents.
*/
if (mechToken_tvb && next_level_value)
call_dissector(next_level_value->handle, mechToken_tvb, actx->pinfo, tree);
#.FN_BODY NegTokenTarg/supportedMech
conversation_t *conversation;
saw_mechanism = FALSE;
%(DEFAULT_BODY)s
/*
* If we saw an explicit mechType we store this in the conversation so that
* it will override any mechType we might have picked up from the
* negTokenInit.
*/
if(saw_mechanism){
conversation = find_or_create_conversation(actx->pinfo);
conversation_add_proto_data(conversation, proto_spnego, next_level_value);
}
#.FN_PARS NegTokenTarg/responseToken
VAL_PTR = &responseToken_tvb
#.FN_BODY NegTokenTarg/responseToken
tvbuff_t *responseToken_tvb;
%(DEFAULT_BODY)s
/*
* Now, we should be able to dispatch, if we've gotten a tvbuff for
* the token and we have information on how to dissect its contents.
* However, we should make sure that there is something in the
* response token ...
*/
if (responseToken_tvb && (tvb_reported_length(responseToken_tvb) > 0) ){
gssapi_oid_value *value=next_level_value;
if(value){
call_dissector(value->handle, responseToken_tvb, actx->pinfo, tree);
}
}
#.END
#
# Editor modelines - https://www.wireshark.org/tools/modelines.html
#
# Local variables:
# c-basic-offset: 2
# tab-width: 8
# indent-tabs-mode: nil
# End:
#
# vi: set shiftwidth=2 tabstop=8 expandtab:
# :indentSize=2:tabSize=8:noTabs=true:
#
|
