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
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
|
/* Copyright (C) 2018 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
use crate::kerberos::*;
use crate::smb::ntlmssp_records::*;
use crate::smb::smb::*;
use nom7::{Err, IResult};
use der_parser6::ber::BerObjectContent;
use der_parser6::der::{parse_der_oid, parse_der_sequence};
fn parse_secblob_get_spnego(blob: &[u8]) -> IResult<&[u8], &[u8], SecBlobError>
{
let (rem, base_o) = der_parser6::parse_der(blob).map_err(Err::convert)?;
SCLogDebug!("parse_secblob_get_spnego: base_o {:?}", base_o);
let d = match base_o.content.as_slice() {
Err(_) => { return Err(Err::Error(SecBlobError::NotSpNego)); },
Ok(d) => d,
};
let (next, o) = parse_der_oid(d).map_err(Err::convert)?;
SCLogDebug!("parse_secblob_get_spnego: sub_o {:?}", o);
let oid = match o.content.as_oid() {
Ok(oid) => oid,
Err(_) => {
return Err(Err::Error(SecBlobError::NotSpNego));
},
};
SCLogDebug!("oid {}", oid.to_string());
match oid.to_string().as_str() {
"1.3.6.1.5.5.2" => {
SCLogDebug!("SPNEGO {}", oid);
},
_ => {
return Err(Err::Error(SecBlobError::NotSpNego));
},
}
SCLogDebug!("parse_secblob_get_spnego: next {:?}", next);
SCLogDebug!("parse_secblob_get_spnego: DONE");
Ok((rem, next))
}
fn parse_secblob_spnego_start(blob: &[u8]) -> IResult<&[u8], &[u8], SecBlobError>
{
let (rem, o) = der_parser6::parse_der(blob).map_err(Err::convert)?;
let d = match o.content.as_slice() {
Ok(d) => {
SCLogDebug!("d: next data len {}",d.len());
d
},
_ => {
return Err(Err::Error(SecBlobError::NotSpNego));
},
};
Ok((rem, d))
}
#[derive(Debug, PartialEq)]
pub struct SpnegoRequest {
pub krb: Option<Kerberos5Ticket>,
pub ntlmssp: Option<NtlmsspData>,
}
fn parse_secblob_spnego(blob: &[u8]) -> Option<SpnegoRequest>
{
let mut have_ntlmssp = false;
let mut have_kerberos = false;
let mut kticket : Option<Kerberos5Ticket> = None;
let mut ntlmssp : Option<NtlmsspData> = None;
let o = match parse_der_sequence(blob) {
Ok((_, o)) => o,
_ => { return None; },
};
for s in o {
SCLogDebug!("s {:?}", s);
let n = match s.content.as_slice() {
Ok(s) => s,
_ => { continue; },
};
let o = match der_parser6::parse_der(n) {
Ok((_,x)) => x,
_ => { continue; },
};
SCLogDebug!("o {:?}", o);
match o.content {
BerObjectContent::Sequence(ref seq) => {
for se in seq {
SCLogDebug!("SEQ {:?}", se);
match se.content {
BerObjectContent::OID(ref oid) => {
SCLogDebug!("OID {:?}", oid);
match oid.to_string().as_str() {
"1.2.840.48018.1.2.2" => { SCLogDebug!("Microsoft Kerberos 5"); },
"1.2.840.113554.1.2.2" => { SCLogDebug!("Kerberos 5"); have_kerberos = true; },
"1.2.840.113554.1.2.2.1" => { SCLogDebug!("krb5-name"); },
"1.2.840.113554.1.2.2.2" => { SCLogDebug!("krb5-principal"); },
"1.2.840.113554.1.2.2.3" => { SCLogDebug!("krb5-user-to-user-mech"); },
"1.3.6.1.4.1.311.2.2.10" => { SCLogDebug!("NTLMSSP"); have_ntlmssp = true; },
"1.3.6.1.4.1.311.2.2.30" => { SCLogDebug!("NegoEx"); },
_ => { SCLogDebug!("unexpected OID {:?}", oid); },
}
},
_ => { SCLogDebug!("expected OID, got {:?}", se); },
}
}
},
BerObjectContent::OctetString(os) => {
if have_kerberos {
if let Ok((_, t)) = parse_kerberos5_request(os) {
kticket = Some(t)
}
}
if have_ntlmssp && kticket.is_none() {
SCLogDebug!("parsing expected NTLMSSP");
ntlmssp = parse_ntlmssp_blob(os);
}
},
_ => {},
}
}
let s = SpnegoRequest {
krb: kticket,
ntlmssp,
};
Some(s)
}
#[derive(Debug,PartialEq, Eq)]
pub struct NtlmsspData {
pub host: Vec<u8>,
pub user: Vec<u8>,
pub domain: Vec<u8>,
pub version: Option<NTLMSSPVersion>,
pub warning: bool,
}
/// take in blob, search for the header and parse it
fn parse_ntlmssp_blob(blob: &[u8]) -> Option<NtlmsspData>
{
let mut ntlmssp_data : Option<NtlmsspData> = None;
SCLogDebug!("NTLMSSP {:?}", blob);
if let Ok((_, nd)) = parse_ntlmssp(blob) {
SCLogDebug!("NTLMSSP TYPE {}/{} nd {:?}",
nd.msg_type, &ntlmssp_type_string(nd.msg_type), nd);
match nd.msg_type {
NTLMSSP_NEGOTIATE => {
},
NTLMSSP_AUTH => {
if let Ok((_, ad)) = parse_ntlm_auth_record(nd.data) {
SCLogDebug!("auth data {:?}", ad);
let mut host = ad.host.to_vec();
host.retain(|&i|i != 0x00);
let mut user = ad.user.to_vec();
user.retain(|&i|i != 0x00);
let mut domain = ad.domain.to_vec();
domain.retain(|&i|i != 0x00);
let d = NtlmsspData {
host,
user,
domain,
warning: ad.warning,
version: ad.version,
};
ntlmssp_data = Some(d);
}
},
_ => {},
}
}
return ntlmssp_data;
}
// if spnego parsing fails try to fall back to ntlmssp
pub fn parse_secblob(blob: &[u8]) -> Option<SpnegoRequest>
{
match parse_secblob_get_spnego(blob) {
Ok((_, spnego)) => {
match parse_secblob_spnego_start(spnego) {
Ok((_, spnego_start)) => {
parse_secblob_spnego(spnego_start)
},
_ => {
match parse_ntlmssp_blob(blob) {
Some(n) => {
let s = SpnegoRequest {
krb: None,
ntlmssp: Some(n),
};
Some(s)
},
None => { None },
}
},
}
},
_ => {
match parse_ntlmssp_blob(blob) {
Some(n) => {
let s = SpnegoRequest {
krb: None,
ntlmssp: Some(n),
};
Some(s)
},
None => { None },
}
},
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_parse_secblob() {
// smb2.security_blob
let blob = hex::decode("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").unwrap();
let result = parse_secblob(&blob);
assert_eq!(
result,
Some(SpnegoRequest {
krb: None,
ntlmssp: Some(NtlmsspData {
host: b"DESKTOP-2AEFM7G".to_vec(),
user: b"user".to_vec(),
domain: b"DESKTOP-2AEFM7G".to_vec(),
version: Some(NTLMSSPVersion {
ver_major: 10,
ver_minor: 0,
ver_build: 10586,
ver_ntlm_rev: 15,
},),
warning: false,
}),
})
);
}
}
|
