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
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#![cfg_attr(feature = "deny-warnings", deny(warnings))]
#![warn(clippy::use_self)]
mod common;
use std::convert::TryFrom;
use common::{
apply_header_protection, decode_initial_header, initial_aead_and_hp, remove_header_protection,
};
use neqo_common::{Datagram, Decoder, Encoder, Role};
use neqo_transport::{ConnectionError, ConnectionParameters, Error, State, Version};
use test_fixture::{self, default_client, default_server, new_client, now, split_datagram};
#[test]
fn connect() {
let (_client, _server) = test_fixture::connect();
}
#[test]
fn truncate_long_packet() {
let mut client = default_client();
let mut server = default_server();
let out = client.process(None, now());
assert!(out.as_dgram_ref().is_some());
let out = server.process(out.as_dgram_ref(), now());
assert!(out.as_dgram_ref().is_some());
// This will truncate the Handshake packet from the server.
let dupe = out.as_dgram_ref().unwrap().clone();
// Count the padding in the packet, plus 1.
let tail = dupe.iter().rev().take_while(|b| **b == 0).count() + 1;
let truncated = Datagram::new(
dupe.source(),
dupe.destination(),
dupe.tos(),
dupe.ttl(),
&dupe[..(dupe.len() - tail)],
);
let hs_probe = client.process(Some(&truncated), now()).dgram();
assert!(hs_probe.is_some());
// Now feed in the untruncated packet.
let out = client.process(out.as_dgram_ref(), now());
assert!(out.as_dgram_ref().is_some()); // Throw this ACK away.
assert!(test_fixture::maybe_authenticate(&mut client));
let out = client.process(None, now());
assert!(out.as_dgram_ref().is_some());
assert!(client.state().connected());
let out = server.process(out.as_dgram_ref(), now());
assert!(out.as_dgram_ref().is_some());
assert!(server.state().connected());
}
/// Test that reordering parts of the server Initial doesn't change things.
#[test]
fn reorder_server_initial() {
// A simple ACK frame for a single packet with packet number 0.
const ACK_FRAME: &[u8] = &[0x02, 0x00, 0x00, 0x00, 0x00];
let mut client = new_client(
ConnectionParameters::default().versions(Version::Version1, vec![Version::Version1]),
);
let mut server = default_server();
let client_initial = client.process_output(now());
let (_, client_dcid, _, _) =
decode_initial_header(client_initial.as_dgram_ref().unwrap(), Role::Client);
let client_dcid = client_dcid.to_owned();
let server_packet = server.process(client_initial.as_dgram_ref(), now()).dgram();
let (server_initial, server_hs) = split_datagram(server_packet.as_ref().unwrap());
let (protected_header, _, _, payload) = decode_initial_header(&server_initial, Role::Server);
// Now decrypt the packet.
let (aead, hp) = initial_aead_and_hp(&client_dcid, Role::Server);
let (header, pn) = remove_header_protection(&hp, protected_header, payload);
assert_eq!(pn, 0);
let pn_len = header.len() - protected_header.len();
let mut buf = vec![0; payload.len()];
let mut plaintext = aead
.decrypt(pn, &header, &payload[pn_len..], &mut buf)
.unwrap()
.to_owned();
// Now we need to find the frames. Make some really strong assumptions.
let mut dec = Decoder::new(&plaintext[..]);
assert_eq!(dec.decode(ACK_FRAME.len()), Some(ACK_FRAME));
assert_eq!(dec.decode_varint(), Some(0x06)); // CRYPTO
assert_eq!(dec.decode_varint(), Some(0x00)); // offset
dec.skip_vvec(); // Skip over the payload.
let end = dec.offset();
// Move the ACK frame after the CRYPTO frame.
plaintext[..end].rotate_left(ACK_FRAME.len());
// And rebuild a packet.
let mut packet = header.clone();
packet.resize(1200, 0);
aead.encrypt(pn, &header, &plaintext, &mut packet[header.len()..])
.unwrap();
apply_header_protection(&hp, &mut packet, protected_header.len()..header.len());
let reordered = Datagram::new(
server_initial.source(),
server_initial.destination(),
server_initial.tos(),
server_initial.ttl(),
packet,
);
// Now a connection can be made successfully.
// Though we modified the server's Initial packet, we get away with it.
// TLS only authenticates the content of the CRYPTO frame, which was untouched.
client.process_input(&reordered, now());
client.process_input(&server_hs.unwrap(), now());
assert!(test_fixture::maybe_authenticate(&mut client));
let finished = client.process_output(now());
assert_eq!(*client.state(), State::Connected);
let done = server.process(finished.as_dgram_ref(), now());
assert_eq!(*server.state(), State::Confirmed);
client.process_input(done.as_dgram_ref().unwrap(), now());
assert_eq!(*client.state(), State::Confirmed);
}
/// Overflow the crypto buffer.
#[test]
fn overflow_crypto() {
let mut client = new_client(
ConnectionParameters::default().versions(Version::Version1, vec![Version::Version1]),
);
let mut server = default_server();
let client_initial = client.process_output(now()).dgram();
let (_, client_dcid, _, _) =
decode_initial_header(client_initial.as_ref().unwrap(), Role::Client);
let client_dcid = client_dcid.to_owned();
let server_packet = server.process(client_initial.as_ref(), now()).dgram();
let (server_initial, _) = split_datagram(server_packet.as_ref().unwrap());
// Now decrypt the server packet to get AEAD and HP instances.
// We won't be using the packet, but making new ones.
let (aead, hp) = initial_aead_and_hp(&client_dcid, Role::Server);
let (_, server_dcid, server_scid, _) = decode_initial_header(&server_initial, Role::Server);
// Send in 100 packets, each with 1000 bytes of crypto frame data each,
// eventually this will overrun the buffer we keep for crypto data.
let mut payload = Encoder::with_capacity(1024);
for pn in 0..100_u64 {
payload.truncate(0);
payload
.encode_varint(0x06_u64) // CRYPTO frame type.
.encode_varint(pn * 1000 + 1) // offset
.encode_varint(1000_u64); // length
let plen = payload.len();
payload.pad_to(plen + 1000, 44);
let mut packet = Encoder::with_capacity(1200);
packet
.encode_byte(0xc1) // Initial with packet number length of 2.
.encode_uint(4, Version::Version1.wire_version())
.encode_vec(1, server_dcid)
.encode_vec(1, server_scid)
.encode_vvec(&[]) // token
.encode_varint(u64::try_from(2 + payload.len() + aead.expansion()).unwrap()); // length
let pn_offset = packet.len();
packet.encode_uint(2, pn);
let mut packet = Vec::from(packet);
let header = packet.clone();
packet.resize(header.len() + payload.len() + aead.expansion(), 0);
aead.encrypt(pn, &header, payload.as_ref(), &mut packet[header.len()..])
.unwrap();
apply_header_protection(&hp, &mut packet, pn_offset..(pn_offset + 2));
packet.resize(1200, 0); // Initial has to be 1200 bytes!
let dgram = Datagram::new(
server_initial.source(),
server_initial.destination(),
server_initial.tos(),
server_initial.ttl(),
packet,
);
client.process_input(&dgram, now());
if let State::Closing { error, .. } = client.state() {
assert!(
matches!(
error,
ConnectionError::Transport(Error::CryptoBufferExceeded),
),
"the connection need to abort on crypto buffer"
);
assert!(pn > 64, "at least 64000 bytes of data is buffered");
return;
}
}
panic!("Was not able to overflow the crypto buffer");
}
|
