/src/suricata8/rust/src/ssh/parser.rs
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1 | | /* Copyright (C) 2020 Open Information Security Foundation |
2 | | * |
3 | | * You can copy, redistribute or modify this Program under the terms of |
4 | | * the GNU General Public License version 2 as published by the Free |
5 | | * Software Foundation. |
6 | | * |
7 | | * This program is distributed in the hope that it will be useful, |
8 | | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
9 | | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
10 | | * GNU General Public License for more details. |
11 | | * |
12 | | * You should have received a copy of the GNU General Public License |
13 | | * version 2 along with this program; if not, write to the Free Software |
14 | | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
15 | | * 02110-1301, USA. |
16 | | */ |
17 | | |
18 | | use digest::Digest; |
19 | | use digest::Update; |
20 | | use md5::Md5; |
21 | | use nom7::branch::alt; |
22 | | use nom7::bytes::streaming::{is_not, tag, take, take_while}; |
23 | | use nom7::character::streaming::char; |
24 | | use nom7::combinator::{complete, eof, not, rest, verify}; |
25 | | use nom7::multi::length_data; |
26 | | use nom7::number::streaming::{be_u32, be_u8}; |
27 | | use nom7::sequence::terminated; |
28 | | use nom7::IResult; |
29 | | use std::fmt; |
30 | | |
31 | | #[derive(PartialEq, Eq, Copy, Clone, Debug)] |
32 | | pub enum MessageCode { |
33 | | Disconnect, |
34 | | Ignore, |
35 | | Unimplemented, |
36 | | Debug, |
37 | | ServiceRequest, |
38 | | ServiceAccept, |
39 | | Kexinit, |
40 | | NewKeys, |
41 | | KexdhInit, |
42 | | KexdhReply, |
43 | | |
44 | | Undefined(u8), |
45 | | } |
46 | | |
47 | | impl MessageCode { |
48 | 1.05k | fn from_u8(value: u8) -> MessageCode { |
49 | 1.05k | match value { |
50 | 24 | 1 => MessageCode::Disconnect, |
51 | 14 | 2 => MessageCode::Ignore, |
52 | 3 | 3 => MessageCode::Unimplemented, |
53 | 19 | 4 => MessageCode::Debug, |
54 | 8 | 5 => MessageCode::ServiceRequest, |
55 | 15 | 6 => MessageCode::ServiceAccept, |
56 | 205 | 20 => MessageCode::Kexinit, |
57 | 37 | 21 => MessageCode::NewKeys, |
58 | 6 | 30 => MessageCode::KexdhInit, |
59 | 152 | 31 => MessageCode::KexdhReply, |
60 | 570 | _ => MessageCode::Undefined(value), |
61 | | } |
62 | 1.05k | } |
63 | | } |
64 | | |
65 | | #[inline] |
66 | 1.02M | fn is_not_lineend(b: u8) -> bool { |
67 | 1.02M | if b == 10 || b == 13 { |
68 | 12.5k | return false; |
69 | 1.01M | } |
70 | 1.01M | return true; |
71 | 1.02M | } |
72 | | |
73 | | //may leave \r at the end to be removed |
74 | 18.3k | pub fn ssh_parse_line(i: &[u8]) -> IResult<&[u8], &[u8]> { |
75 | 3.51k | fn parser(i: &[u8]) -> IResult<&[u8], &[u8]> { |
76 | 3.51k | let (i, bytes) = tag("\r")(i)?; |
77 | 3.51k | let (i, _) = not(eof)(i)?; |
78 | 3.51k | Ok((i, bytes)) |
79 | 3.51k | } |
80 | 18.3k | terminated( |
81 | 18.3k | take_while(is_not_lineend), |
82 | 18.3k | alt((tag("\n"), tag("\r\n"), parser)), |
83 | 18.3k | )(i) |
84 | 18.3k | } |
85 | | |
86 | | #[derive(PartialEq, Eq)] |
87 | | pub struct SshBanner<'a> { |
88 | | pub protover: &'a [u8], |
89 | | pub swver: &'a [u8], |
90 | | } |
91 | | |
92 | | // Could be simplified adding dummy \n at the end |
93 | | // or use nom5 nom::bytes::complete::is_not |
94 | 869 | pub fn ssh_parse_banner(i: &[u8]) -> IResult<&[u8], SshBanner<'_>> { |
95 | 869 | let (i, _) = tag("SSH-")(i)?; |
96 | 725 | let (i, protover) = is_not("-")(i)?; |
97 | 696 | let (i, _) = char('-')(i)?; |
98 | 696 | let (i, swver) = alt((complete(is_not(" \r\n")), rest))(i)?; |
99 | | //remaining after space is comments |
100 | 696 | Ok((i, SshBanner { protover, swver })) |
101 | 869 | } |
102 | | |
103 | | #[derive(PartialEq, Eq)] |
104 | | pub struct SshRecordHeader { |
105 | | pub pkt_len: u32, |
106 | | padding_len: u8, |
107 | | pub msg_code: MessageCode, |
108 | | } |
109 | | |
110 | | impl fmt::Display for SshRecordHeader { |
111 | 0 | fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
112 | 0 | write!( |
113 | 0 | f, |
114 | 0 | "(pkt_len:{}, padding_len:{}, msg_code:{:?})", |
115 | | self.pkt_len, self.padding_len, self.msg_code |
116 | | ) |
117 | 0 | } |
118 | | } |
119 | | |
120 | 2.55k | pub fn ssh_parse_record_header(i: &[u8]) -> IResult<&[u8], SshRecordHeader> { |
121 | 2.55k | let (i, pkt_len) = verify(be_u32, |&val| val > 1)(i)?; |
122 | 1.77k | let (i, padding_len) = be_u8(i)?; |
123 | 1.56k | let (i, msg_code) = be_u8(i)?; |
124 | 768 | Ok(( |
125 | 768 | i, |
126 | 768 | SshRecordHeader { |
127 | 768 | pkt_len, |
128 | 768 | padding_len, |
129 | 768 | msg_code: MessageCode::from_u8(msg_code), |
130 | 768 | }, |
131 | 768 | )) |
132 | 2.55k | } |
133 | | |
134 | | //test for evasion against pkt_len=0or1... |
135 | 2.86k | pub fn ssh_parse_record(i: &[u8]) -> IResult<&[u8], SshRecordHeader> { |
136 | 2.86k | let (i, pkt_len) = verify(be_u32, |&val| val > 1)(i)?; |
137 | 2.06k | let (i, padding_len) = be_u8(i)?; |
138 | 1.84k | let (i, msg_code) = be_u8(i)?; |
139 | 1.05k | let (i, _) = take((pkt_len - 2) as usize)(i)?; |
140 | 285 | Ok(( |
141 | 285 | i, |
142 | 285 | SshRecordHeader { |
143 | 285 | pkt_len, |
144 | 285 | padding_len, |
145 | 285 | msg_code: MessageCode::from_u8(msg_code), |
146 | 285 | }, |
147 | 285 | )) |
148 | 2.86k | } |
149 | | |
150 | | #[derive(Debug, PartialEq, Eq)] |
151 | | pub struct SshPacketKeyExchange<'a> { |
152 | | pub cookie: &'a [u8], |
153 | | pub kex_algs: &'a [u8], |
154 | | pub server_host_key_algs: &'a [u8], |
155 | | pub encr_algs_client_to_server: &'a [u8], |
156 | | pub encr_algs_server_to_client: &'a [u8], |
157 | | pub mac_algs_client_to_server: &'a [u8], |
158 | | pub mac_algs_server_to_client: &'a [u8], |
159 | | pub comp_algs_client_to_server: &'a [u8], |
160 | | pub comp_algs_server_to_client: &'a [u8], |
161 | | pub langs_client_to_server: &'a [u8], |
162 | | pub langs_server_to_client: &'a [u8], |
163 | | pub first_kex_packet_follows: u8, |
164 | | pub reserved: u32, |
165 | | } |
166 | | |
167 | | const SSH_HASSH_STRING_DELIMITER_SLICE: [u8; 1] = *b";"; |
168 | | |
169 | | impl SshPacketKeyExchange<'_> { |
170 | 12 | pub fn generate_hassh( |
171 | 12 | &self, hassh_string: &mut Vec<u8>, hassh: &mut Vec<u8>, to_server: &bool, |
172 | 12 | ) { |
173 | 12 | let slices = if *to_server { |
174 | 10 | [ |
175 | 10 | self.kex_algs, |
176 | 10 | &SSH_HASSH_STRING_DELIMITER_SLICE, |
177 | 10 | self.encr_algs_server_to_client, |
178 | 10 | &SSH_HASSH_STRING_DELIMITER_SLICE, |
179 | 10 | self.mac_algs_server_to_client, |
180 | 10 | &SSH_HASSH_STRING_DELIMITER_SLICE, |
181 | 10 | self.comp_algs_server_to_client, |
182 | 10 | ] |
183 | | } else { |
184 | 2 | [ |
185 | 2 | self.kex_algs, |
186 | 2 | &SSH_HASSH_STRING_DELIMITER_SLICE, |
187 | 2 | self.encr_algs_client_to_server, |
188 | 2 | &SSH_HASSH_STRING_DELIMITER_SLICE, |
189 | 2 | self.mac_algs_client_to_server, |
190 | 2 | &SSH_HASSH_STRING_DELIMITER_SLICE, |
191 | 2 | self.comp_algs_client_to_server, |
192 | 2 | ] |
193 | | }; |
194 | | // reserving memory |
195 | 84 | hassh_string.reserve_exact(slices.iter().fold(0, |acc, x| acc + x.len())); |
196 | | // copying slices to hassh string |
197 | 12 | slices |
198 | 12 | .iter() |
199 | 84 | .for_each(|&x| hassh_string.extend_from_slice(x)); |
200 | 12 | hassh.extend(format!("{:x}", Md5::new().chain(hassh_string).finalize()).as_bytes()); |
201 | 12 | } |
202 | | } |
203 | | |
204 | | #[inline] |
205 | 728 | fn parse_string(i: &[u8]) -> IResult<&[u8], &[u8]> { |
206 | 728 | length_data(be_u32)(i) |
207 | 728 | } |
208 | | |
209 | 181 | pub fn ssh_parse_key_exchange(i: &[u8]) -> IResult<&[u8], SshPacketKeyExchange<'_>> { |
210 | 181 | let (i, cookie) = take(16_usize)(i)?; |
211 | 172 | let (i, kex_algs) = parse_string(i)?; |
212 | 125 | let (i, server_host_key_algs) = parse_string(i)?; |
213 | 110 | let (i, encr_algs_client_to_server) = parse_string(i)?; |
214 | 96 | let (i, encr_algs_server_to_client) = parse_string(i)?; |
215 | 88 | let (i, mac_algs_client_to_server) = parse_string(i)?; |
216 | 35 | let (i, mac_algs_server_to_client) = parse_string(i)?; |
217 | 31 | let (i, comp_algs_client_to_server) = parse_string(i)?; |
218 | 29 | let (i, comp_algs_server_to_client) = parse_string(i)?; |
219 | 24 | let (i, langs_client_to_server) = parse_string(i)?; |
220 | 18 | let (i, langs_server_to_client) = parse_string(i)?; |
221 | 13 | let (i, first_kex_packet_follows) = be_u8(i)?; |
222 | 13 | let (i, reserved) = be_u32(i)?; |
223 | 12 | Ok(( |
224 | 12 | i, |
225 | 12 | SshPacketKeyExchange { |
226 | 12 | cookie, |
227 | 12 | kex_algs, |
228 | 12 | server_host_key_algs, |
229 | 12 | encr_algs_client_to_server, |
230 | 12 | encr_algs_server_to_client, |
231 | 12 | mac_algs_client_to_server, |
232 | 12 | mac_algs_server_to_client, |
233 | 12 | comp_algs_client_to_server, |
234 | 12 | comp_algs_server_to_client, |
235 | 12 | langs_client_to_server, |
236 | 12 | langs_server_to_client, |
237 | 12 | first_kex_packet_follows, |
238 | 12 | reserved, |
239 | 12 | }, |
240 | 12 | )) |
241 | 181 | } |
242 | | |
243 | | #[cfg(test)] |
244 | | mod tests { |
245 | | |
246 | | use super::*; |
247 | | use nom7::{Err, Needed}; |
248 | | |
249 | | /// Simple test of some valid data. |
250 | | #[test] |
251 | | fn test_ssh_parse_banner() { |
252 | | let buf = b"SSH-Single-"; |
253 | | let result = ssh_parse_banner(buf); |
254 | | match result { |
255 | | Ok((_, message)) => { |
256 | | // Check the first message. |
257 | | assert_eq!(message.protover, b"Single"); |
258 | | assert_eq!(message.swver, b""); |
259 | | } |
260 | | Err(err) => { |
261 | | panic!("Result should not be an error: {:?}.", err); |
262 | | } |
263 | | } |
264 | | let buf2 = b"SSH-2.0-Soft"; |
265 | | let result2 = ssh_parse_banner(buf2); |
266 | | match result2 { |
267 | | Ok((_, message)) => { |
268 | | // Check the first message. |
269 | | assert_eq!(message.protover, b"2.0"); |
270 | | assert_eq!(message.swver, b"Soft"); |
271 | | } |
272 | | Err(err) => { |
273 | | panic!("Result should not be an error: {:?}.", err); |
274 | | } |
275 | | } |
276 | | } |
277 | | |
278 | | #[test] |
279 | | fn test_parse_line() { |
280 | | let buf = b"SSH-Single\n"; |
281 | | let result = ssh_parse_line(buf); |
282 | | match result { |
283 | | Ok((_, message)) => { |
284 | | // Check the first message. |
285 | | assert_eq!(message, b"SSH-Single"); |
286 | | } |
287 | | Err(err) => { |
288 | | panic!("Result should not be an error: {:?}.", err); |
289 | | } |
290 | | } |
291 | | let buf2 = b"SSH-Double\r\n"; |
292 | | let result2 = ssh_parse_line(buf2); |
293 | | match result2 { |
294 | | Ok((_, message)) => { |
295 | | // Check the first message. |
296 | | assert_eq!(message, b"SSH-Double"); |
297 | | } |
298 | | Err(err) => { |
299 | | panic!("Result should not be an error: {:?}.", err); |
300 | | } |
301 | | } |
302 | | let buf3 = b"SSH-Oops\rMore\r\n"; |
303 | | let result3 = ssh_parse_line(buf3); |
304 | | match result3 { |
305 | | Ok((rem, message)) => { |
306 | | // Check the first message. |
307 | | assert_eq!(message, b"SSH-Oops"); |
308 | | assert_eq!(rem, b"More\r\n"); |
309 | | } |
310 | | Err(err) => { |
311 | | panic!("Result should not be an error: {:?}.", err); |
312 | | } |
313 | | } |
314 | | let buf4 = b"SSH-Miss\r"; |
315 | | let result4 = ssh_parse_line(buf4); |
316 | | match result4 { |
317 | | Ok((_, _)) => { |
318 | | panic!("Expected incomplete result"); |
319 | | } |
320 | | Err(Err::Incomplete(_)) => { |
321 | | //OK |
322 | | assert_eq!(1, 1); |
323 | | } |
324 | | Err(err) => { |
325 | | panic!("Result should not be an error: {:?}.", err); |
326 | | } |
327 | | } |
328 | | let buf5 = b"\n"; |
329 | | let result5 = ssh_parse_line(buf5); |
330 | | match result5 { |
331 | | Ok((_, message)) => { |
332 | | // Check empty line |
333 | | assert_eq!(message, b""); |
334 | | } |
335 | | Err(err) => { |
336 | | panic!("Result should not be an error: {:?}.", err); |
337 | | } |
338 | | } |
339 | | } |
340 | | #[test] |
341 | | fn test_parse_key_exchange() { |
342 | | let client_key_exchange = [ |
343 | | 0x18, 0x70, 0xCB, 0xA4, 0xA3, 0xD4, 0xDC, 0x88, 0x6F, 0xFD, 0x76, 0x06, 0xCF, 0x36, |
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441 | | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
442 | | ]; |
443 | | let cookie = [ |
444 | | 0x18, 0x70, 0xcb, 0xa4, 0xa3, 0xd4, 0xdc, 0x88, 0x6f, 0xfd, 0x76, 0x06, 0xcf, 0x36, |
445 | | 0x1b, 0xc6, |
446 | | ]; |
447 | | let key_exchange = SshPacketKeyExchange { |
448 | | cookie: &cookie, |
449 | | kex_algs: b"curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c", |
450 | | server_host_key_algs: b"ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa", |
451 | | encr_algs_client_to_server: b"chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com", |
452 | | encr_algs_server_to_client: b"chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com", |
453 | | mac_algs_client_to_server: b"umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1", |
454 | | mac_algs_server_to_client: b"umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1", |
455 | | comp_algs_client_to_server: b"none,zlib@openssh.com,zlib", |
456 | | comp_algs_server_to_client: b"none,zlib@openssh.com,zlib", |
457 | | langs_client_to_server: b"", |
458 | | langs_server_to_client: b"", |
459 | | first_kex_packet_follows: 0, |
460 | | reserved: 0, |
461 | | }; |
462 | | |
463 | | let expected = Ok((b"" as &[u8], key_exchange)); |
464 | | let res = ssh_parse_key_exchange(&client_key_exchange); |
465 | | assert_eq!(res, expected); |
466 | | } |
467 | | |
468 | | #[test] |
469 | | fn test_parse_hassh() { |
470 | | let client_key_exchange = [ |
471 | | 0x18, 0x70, 0xCB, 0xA4, 0xA3, 0xD4, 0xDC, 0x88, 0x6F, 0xFD, 0x76, 0x06, 0xCF, 0x36, |
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569 | | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
570 | | ]; |
571 | | let mut hassh_string: Vec<u8> = vec![]; |
572 | | let mut hassh: Vec<u8> = vec![]; |
573 | | if let Ok((_, key_exchange)) = ssh_parse_key_exchange(&client_key_exchange) { |
574 | | key_exchange.generate_hassh(&mut hassh_string, &mut hassh, &true); |
575 | | } |
576 | | |
577 | | assert_eq!(hassh_string, "curve25519-sha256,curve25519-sha256@libssh.org,\ |
578 | | ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,\ |
579 | | diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,\ |
580 | | diffie-hellman-group14-sha1,ext-info-c;chacha20-poly1305@openssh.com,aes128-ctr,\ |
581 | | aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com;umac-64-etm@openssh.com,\ |
582 | | umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,\ |
583 | | hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,\ |
584 | | hmac-sha2-256,hmac-sha2-512,hmac-sha1;none,zlib@openssh.com,zlib".as_bytes().to_vec()); |
585 | | |
586 | | assert_eq!( |
587 | | hassh, |
588 | | "ec7378c1a92f5a8dde7e8b7a1ddf33d1".as_bytes().to_vec() |
589 | | ); |
590 | | } |
591 | | |
592 | | #[test] |
593 | | fn test_parse_hassh_server() { |
594 | | let server_key_exchange = [ |
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669 | | 0x6e, 0x65, 0x2c, 0x7a, 0x6c, 0x69, 0x62, 0x40, 0x6f, 0x70, 0x65, 0x6e, 0x73, 0x73, |
670 | | 0x68, 0x2e, 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
671 | | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
672 | | ]; |
673 | | let mut hassh_server_string: Vec<u8> = vec![]; |
674 | | let mut hassh_server: Vec<u8> = vec![]; |
675 | | if let Ok((_, key_exchange)) = ssh_parse_key_exchange(&server_key_exchange) { |
676 | | key_exchange.generate_hassh(&mut hassh_server_string, &mut hassh_server, &true); |
677 | | } |
678 | | assert_eq!( |
679 | | hassh_server, |
680 | | "b12d2871a1189eff20364cf5333619ee".as_bytes().to_vec() |
681 | | ); |
682 | | } |
683 | | |
684 | | #[test] |
685 | | fn test_parse_hassh_server_malicious() { |
686 | | let server_key_exchange = [ |
687 | | 0x7d, 0x76, 0x4f, 0x78, 0x81, 0x9e, 0x10, 0xfa, 0x23, 0x72, 0xb5, 0x15, 0x56, 0xba, |
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690 | | 0x32, 0x35, 0x35, 0x31, 0x39, 0x2d, 0x73, 0x68, 0x61, 0x32, 0x35, 0x36, 0x40, 0x6c, |
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762 | | 0x2e, 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
763 | | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
764 | | ]; |
765 | | |
766 | | if let Err(e) = ssh_parse_key_exchange(&server_key_exchange) { |
767 | | assert_eq!(e, Err::Incomplete(Needed::new(15964))); |
768 | | } else { |
769 | | panic!("ssh_parse_key_exchange() parsed malicious key_exchange"); |
770 | | } |
771 | | } |
772 | | } |