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
|
// 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.
use std::{
ffi::CString,
os::raw::{c_char, c_uint},
ptr::{addr_of_mut, null_mut},
};
use neqo_common::qtrace;
use crate::{
err::{ssl::SSL_ERROR_ECH_RETRY_WITH_ECH, Error, Res},
experimental_api, null_safe_slice,
p11::{
self, Item, PrivateKey, PublicKey, SECITEM_FreeItem, SECItem, SECKEYPrivateKey,
SECKEYPublicKey, Slot,
},
ssl::{PRBool, PRFileDesc},
};
pub use crate::{
p11::{HpkeAeadId as AeadId, HpkeKdfId as KdfId, HpkeKemId as KemId},
ssl::HpkeSymmetricSuite as SymmetricSuite,
};
experimental_api!(SSL_EnableTls13GreaseEch(
fd: *mut PRFileDesc,
enabled: PRBool,
));
experimental_api!(SSL_GetEchRetryConfigs(
fd: *mut PRFileDesc,
config: *mut SECItem,
));
experimental_api!(SSL_SetClientEchConfigs(
fd: *mut PRFileDesc,
config_list: *const u8,
config_list_len: c_uint,
));
experimental_api!(SSL_SetServerEchConfigs(
fd: *mut PRFileDesc,
pk: *const SECKEYPublicKey,
sk: *const SECKEYPrivateKey,
record: *const u8,
record_len: c_uint,
));
experimental_api!(SSL_EncodeEchConfigId(
config_id: u8,
public_name: *const c_char,
max_name_len: c_uint,
kem_id: KemId::Type,
pk: *const SECKEYPublicKey,
hpke_suites: *const SymmetricSuite,
hpke_suite_count: c_uint,
out: *mut u8,
out_len: *mut c_uint,
max_len: c_uint,
));
/// Convert any result that contains an ECH error into a result with an `EchRetry`.
pub fn convert_ech_error(fd: *mut PRFileDesc, err: Error) -> Error {
if let Error::NssError {
code: SSL_ERROR_ECH_RETRY_WITH_ECH,
..
} = &err
{
let mut item = Item::make_empty();
if unsafe { SSL_GetEchRetryConfigs(fd, &mut item).is_err() } {
return Error::InternalError;
}
let buf = unsafe {
let slc = null_safe_slice(item.data, item.len);
let buf = Vec::from(slc);
SECITEM_FreeItem(&mut item, PRBool::from(false));
buf
};
Error::EchRetry(buf)
} else {
err
}
}
/// Generate a key pair for encrypted client hello (ECH).
///
/// # Errors
///
/// When NSS fails to generate a key pair or when the KEM is not supported.
///
/// # Panics
///
/// When underlying types aren't large enough to hold keys. So never.
pub fn generate_keys() -> Res<(PrivateKey, PublicKey)> {
let slot = Slot::internal()?;
let oid_data = unsafe { p11::SECOID_FindOIDByTag(p11::SECOidTag::SEC_OID_CURVE25519) };
let oid = unsafe { oid_data.as_ref() }.ok_or(Error::InternalError)?;
let oid_slc = unsafe { null_safe_slice(oid.oid.data, oid.oid.len) };
let mut params: Vec<u8> = Vec::with_capacity(oid_slc.len() + 2);
params.push(u8::try_from(p11::SEC_ASN1_OBJECT_ID).unwrap());
params.push(u8::try_from(oid.oid.len).unwrap());
params.extend_from_slice(oid_slc);
let mut public_ptr: *mut SECKEYPublicKey = null_mut();
let mut param_item = Item::wrap(¶ms);
// If we have tracing on, try to ensure that key data can be read.
let insensitive_secret_ptr = if log::log_enabled!(log::Level::Trace) {
unsafe {
p11::PK11_GenerateKeyPairWithOpFlags(
*slot,
p11::CK_MECHANISM_TYPE::from(p11::CKM_EC_KEY_PAIR_GEN),
addr_of_mut!(param_item).cast(),
&mut public_ptr,
p11::PK11_ATTR_SESSION | p11::PK11_ATTR_INSENSITIVE | p11::PK11_ATTR_PUBLIC,
p11::CK_FLAGS::from(p11::CKF_DERIVE),
p11::CK_FLAGS::from(p11::CKF_DERIVE),
null_mut(),
)
}
} else {
null_mut()
};
assert_eq!(insensitive_secret_ptr.is_null(), public_ptr.is_null());
let secret_ptr = if insensitive_secret_ptr.is_null() {
unsafe {
p11::PK11_GenerateKeyPairWithOpFlags(
*slot,
p11::CK_MECHANISM_TYPE::from(p11::CKM_EC_KEY_PAIR_GEN),
addr_of_mut!(param_item).cast(),
&mut public_ptr,
p11::PK11_ATTR_SESSION | p11::PK11_ATTR_SENSITIVE | p11::PK11_ATTR_PRIVATE,
p11::CK_FLAGS::from(p11::CKF_DERIVE),
p11::CK_FLAGS::from(p11::CKF_DERIVE),
null_mut(),
)
}
} else {
insensitive_secret_ptr
};
assert_eq!(secret_ptr.is_null(), public_ptr.is_null());
let sk = PrivateKey::from_ptr(secret_ptr)?;
let pk = PublicKey::from_ptr(public_ptr)?;
qtrace!("Generated key pair: sk={:?} pk={:?}", sk, pk);
Ok((sk, pk))
}
/// Encode a configuration for encrypted client hello (ECH).
///
/// # Errors
///
/// When NSS fails to generate a valid configuration encoding (i.e., unlikely).
pub fn encode_config(config: u8, public_name: &str, pk: &PublicKey) -> Res<Vec<u8>> {
// A sensible fixed value for the maximum length of a name.
const MAX_NAME_LEN: c_uint = 64;
// Enable a selection of suites.
// NSS supports SHA-512 as well, which could be added here.
const SUITES: &[SymmetricSuite] = &[
SymmetricSuite {
kdfId: KdfId::HpkeKdfHkdfSha256,
aeadId: AeadId::HpkeAeadAes128Gcm,
},
SymmetricSuite {
kdfId: KdfId::HpkeKdfHkdfSha256,
aeadId: AeadId::HpkeAeadChaCha20Poly1305,
},
SymmetricSuite {
kdfId: KdfId::HpkeKdfHkdfSha384,
aeadId: AeadId::HpkeAeadAes128Gcm,
},
SymmetricSuite {
kdfId: KdfId::HpkeKdfHkdfSha384,
aeadId: AeadId::HpkeAeadChaCha20Poly1305,
},
];
let name = CString::new(public_name)?;
let mut encoded = [0; 1024];
let mut encoded_len = 0;
unsafe {
SSL_EncodeEchConfigId(
config,
name.as_ptr(),
MAX_NAME_LEN,
KemId::HpkeDhKemX25519Sha256,
**pk,
SUITES.as_ptr(),
c_uint::try_from(SUITES.len())?,
encoded.as_mut_ptr(),
&mut encoded_len,
c_uint::try_from(encoded.len())?,
)?;
}
Ok(Vec::from(&encoded[..usize::try_from(encoded_len)?]))
}
|
