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|
# spnego.cnf
# spnego conformation file
# $Id$
#.EXPORTS
#.PDU
#.NO_EMIT
#.TYPE_RENAME
NegTokenInit/mechListMIC T_NegTokenInit_mechListMIC
#.FIELD_RENAME
NegTokenInit/mechListMIC negTokenInit_mechListMIC
#.FN_PARS MechType
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;
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 = 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, FALSE);
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(tvb, offset, -1, -1);
if (next_level_value && next_level_value->wrap_handle) {
len = call_dissector(next_level_value->wrap_handle, token_tvb, pinfo,
subtree);
if (len == 0)
offset = tvb_length(tvb);
else
offset = offset + len;
} else
offset = tvb_length(tvb);
#.FN_HDR MechTypeList
saw_mechanism = FALSE;
#.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, pinfo, tree);
#.FN_BODY NegTokenInit/mechListMIC
gint8 class;
gboolean pc;
gint32 tag;
tvbuff_t *mechListMIC_tvb;
/*
* There seems to be two different forms this can take,
* one as an octet string, and one as a general string in a
* sequence.
*
* Peek at the header, and then decide which it is we're seeing.
*/
get_ber_identifier(tvb, offset, &class, &pc, &tag);
if (class == BER_CLASS_UNI && pc && tag == BER_UNI_TAG_SEQUENCE) {
/*
* It's a sequence.
*/
return dissect_spnego_PrincipalSeq(FALSE, tvb, offset, pinfo, tree,
hf_spnego_mechListMIC);
} else {
/*
* It's not a sequence, so dissect it as an octet string,
* which is what it's supposed to be; that'll cause the
* right error report if it's not an octet string, either.
*/
offset = dissect_ber_octet_string(FALSE, pinfo, tree, tvb, offset,
hf_spnego_mechListMIC, &mechListMIC_tvb);
/*
* Now, we should be able to dispatch with that tvbuff.
*/
if (mechListMIC_tvb && next_level_value)
call_dissector(next_level_value->handle, mechListMIC_tvb, pinfo, tree);
return offset;
}
#.FN_BODY NegTokenTarg/supportedMech
conversation_t *conversation;
saw_mechanism = FALSE;
%(DEFAULT_BODY)s
/*
* Now, we need to save this in per-proto info in the
* conversation if it exists. We also should create a
* conversation if one does not exist. FIXME!
* Hmmm, might need to be smarter, because there can be
* multiple mechTypes in a negTokenInit with one being the
* default used in the Token if present. Then the negTokenTarg
* could override that. :-(
*/
if ((conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst,
pinfo->ptype, pinfo->srcport,
pinfo->destport, 0))) {
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 && next_level_value) {
if (tvb_reported_length(responseToken_tvb) > 0)
call_dissector(next_level_value->handle, responseToken_tvb, pinfo, tree);
}
#.FN_PARS NegTokenTarg/mechListMIC
VAL_PTR = &mechListMIC_tvb
#.FN_BODY NegTokenTarg/mechListMIC
tvbuff_t *mechListMIC_tvb;
%(DEFAULT_BODY)s
/*
* Now, we should be able to dispatch, if we've gotten a tvbuff for
* the MIC and we have information on how to dissect its contents.
*/
if (mechListMIC_tvb && next_level_value)
call_dissector(next_level_value->handle, mechListMIC_tvb, pinfo, tree);
#.END
|
