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
use crate::cipher::{make_nonce, Iv, MessageDecrypter, MessageEncrypter};
use crate::enums::ContentType;
use crate::enums::{CipherSuite, ProtocolVersion};
use crate::error::{Error, PeerMisbehaved};
use crate::msgs::base::Payload;
use crate::msgs::codec::Codec;
use crate::msgs::fragmenter::MAX_FRAGMENT_LEN;
use crate::msgs::message::{BorrowedPlainMessage, OpaqueMessage, PlainMessage};
use crate::suites::{BulkAlgorithm, CipherSuiteCommon, SupportedCipherSuite};
use ring::aead;
use std::fmt;
pub(crate) mod key_schedule;
pub static TLS13_CHACHA20_POLY1305_SHA256: SupportedCipherSuite =
SupportedCipherSuite::Tls13(TLS13_CHACHA20_POLY1305_SHA256_INTERNAL);
pub(crate) static TLS13_CHACHA20_POLY1305_SHA256_INTERNAL: &Tls13CipherSuite = &Tls13CipherSuite {
common: CipherSuiteCommon {
suite: CipherSuite::TLS13_CHACHA20_POLY1305_SHA256,
bulk: BulkAlgorithm::Chacha20Poly1305,
aead_algorithm: &ring::aead::CHACHA20_POLY1305,
},
hkdf_algorithm: ring::hkdf::HKDF_SHA256,
#[cfg(feature = "quic")]
confidentiality_limit: u64::MAX,
#[cfg(feature = "quic")]
integrity_limit: 1 << 36,
};
pub static TLS13_AES_256_GCM_SHA384: SupportedCipherSuite =
SupportedCipherSuite::Tls13(&Tls13CipherSuite {
common: CipherSuiteCommon {
suite: CipherSuite::TLS13_AES_256_GCM_SHA384,
bulk: BulkAlgorithm::Aes256Gcm,
aead_algorithm: &ring::aead::AES_256_GCM,
},
hkdf_algorithm: ring::hkdf::HKDF_SHA384,
#[cfg(feature = "quic")]
confidentiality_limit: 1 << 23,
#[cfg(feature = "quic")]
integrity_limit: 1 << 52,
});
pub static TLS13_AES_128_GCM_SHA256: SupportedCipherSuite =
SupportedCipherSuite::Tls13(TLS13_AES_128_GCM_SHA256_INTERNAL);
pub(crate) static TLS13_AES_128_GCM_SHA256_INTERNAL: &Tls13CipherSuite = &Tls13CipherSuite {
common: CipherSuiteCommon {
suite: CipherSuite::TLS13_AES_128_GCM_SHA256,
bulk: BulkAlgorithm::Aes128Gcm,
aead_algorithm: &ring::aead::AES_128_GCM,
},
hkdf_algorithm: ring::hkdf::HKDF_SHA256,
#[cfg(feature = "quic")]
confidentiality_limit: 1 << 23,
#[cfg(feature = "quic")]
integrity_limit: 1 << 52,
};
pub struct Tls13CipherSuite {
pub common: CipherSuiteCommon,
pub(crate) hkdf_algorithm: ring::hkdf::Algorithm,
#[cfg(feature = "quic")]
pub(crate) confidentiality_limit: u64,
#[cfg(feature = "quic")]
pub(crate) integrity_limit: u64,
}
impl Tls13CipherSuite {
pub fn hash_algorithm(&self) -> &'static ring::digest::Algorithm {
self.hkdf_algorithm
.hmac_algorithm()
.digest_algorithm()
}
pub fn can_resume_from(&self, prev: &'static Self) -> Option<&'static Self> {
(prev.hash_algorithm() == self.hash_algorithm()).then(|| prev)
}
}
impl From<&'static Tls13CipherSuite> for SupportedCipherSuite {
fn from(s: &'static Tls13CipherSuite) -> Self {
Self::Tls13(s)
}
}
impl PartialEq for Tls13CipherSuite {
fn eq(&self, other: &Self) -> bool {
self.common.suite == other.common.suite
}
}
impl fmt::Debug for Tls13CipherSuite {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Tls13CipherSuite")
.field("suite", &self.common.suite)
.field("bulk", &self.common.bulk)
.finish()
}
}
struct Tls13MessageEncrypter {
enc_key: aead::LessSafeKey,
iv: Iv,
}
struct Tls13MessageDecrypter {
dec_key: aead::LessSafeKey,
iv: Iv,
}
fn unpad_tls13(v: &mut Vec<u8>) -> ContentType {
loop {
match v.pop() {
Some(0) => {}
Some(content_type) => return ContentType::from(content_type),
None => return ContentType::Unknown(0),
}
}
}
fn make_tls13_aad(len: usize) -> ring::aead::Aad<[u8; TLS13_AAD_SIZE]> {
ring::aead::Aad::from([
0x17, 0x3, 0x3, (len >> 8) as u8,
len as u8,
])
}
const TLS13_AAD_SIZE: usize = 1 + 2 + 2;
impl MessageEncrypter for Tls13MessageEncrypter {
fn encrypt(&self, msg: BorrowedPlainMessage, seq: u64) -> Result<OpaqueMessage, Error> {
let total_len = msg.payload.len() + 1 + self.enc_key.algorithm().tag_len();
let mut payload = Vec::with_capacity(total_len);
payload.extend_from_slice(msg.payload);
msg.typ.encode(&mut payload);
let nonce = make_nonce(&self.iv, seq);
let aad = make_tls13_aad(total_len);
self.enc_key
.seal_in_place_append_tag(nonce, aad, &mut payload)
.map_err(|_| Error::General("encrypt failed".to_string()))?;
Ok(OpaqueMessage {
typ: ContentType::ApplicationData,
version: ProtocolVersion::TLSv1_2,
payload: Payload::new(payload),
})
}
}
impl MessageDecrypter for Tls13MessageDecrypter {
fn decrypt(&self, mut msg: OpaqueMessage, seq: u64) -> Result<PlainMessage, Error> {
let payload = &mut msg.payload.0;
if payload.len() < self.dec_key.algorithm().tag_len() {
return Err(Error::DecryptError);
}
let nonce = make_nonce(&self.iv, seq);
let aad = make_tls13_aad(payload.len());
let plain_len = self
.dec_key
.open_in_place(nonce, aad, payload)
.map_err(|_| Error::DecryptError)?
.len();
payload.truncate(plain_len);
if payload.len() > MAX_FRAGMENT_LEN + 1 {
return Err(Error::PeerSentOversizedRecord);
}
msg.typ = unpad_tls13(payload);
if msg.typ == ContentType::Unknown(0) {
return Err(PeerMisbehaved::IllegalTlsInnerPlaintext.into());
}
if payload.len() > MAX_FRAGMENT_LEN {
return Err(Error::PeerSentOversizedRecord);
}
msg.version = ProtocolVersion::TLSv1_3;
Ok(msg.into_plain_message())
}
}