1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
# spnego.cnf
# spnego conformation file
#.EXPORTS
#.PDU
#.NO_EMIT ONLY_VALS
NegotiationToken
#.FN_BODY NegotiationToken/negTokenInit
bool 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);
}
}
#.FN_BODY NegTokenTarg/mechListMIC VAL_PTR = &mechListMIC_tvb
tvbuff_t *mechListMIC_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 (mechListMIC_tvb && (tvb_reported_length(mechListMIC_tvb) > 0) ){
gssapi_oid_value *value=next_level_value;
if(value){
call_dissector(value->handle, mechListMIC_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:
#
|
