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
|
/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#include "tls/s2n_quic_support.h"
#include "tls/s2n_connection.h"
#include "tls/s2n_tls13.h"
#include "tls/s2n_tls.h"
#include "utils/s2n_mem.h"
#include "utils/s2n_safety.h"
/* When reading and writing records with TCP, S2N sets its input and output buffers
* to the maximum record fragment size to prevent resizing those buffers later.
*
* However, because S2N with QUIC reads and writes messages instead of records,
* the "maximum size" for the input and output buffers would be the maximum message size: 64k.
* Since most messages are MUCH smaller than that (<3k), setting the buffer that large is wasteful.
*
* Instead, we intentionally choose a smaller size and accept that an abnormally large message
* could cause the buffer to resize. */
#define S2N_EXPECTED_QUIC_MESSAGE_SIZE S2N_DEFAULT_FRAGMENT_LENGTH
S2N_RESULT s2n_read_in_bytes(struct s2n_connection *conn, struct s2n_stuffer *output, uint32_t length);
int s2n_config_enable_quic(struct s2n_config *config)
{
notnull_check(config);
config->quic_enabled = true;
return S2N_SUCCESS;
}
int s2n_connection_set_quic_transport_parameters(struct s2n_connection *conn,
const uint8_t *data_buffer, uint16_t data_len)
{
notnull_check(conn);
GUARD(s2n_free(&conn->our_quic_transport_parameters));
GUARD(s2n_alloc(&conn->our_quic_transport_parameters, data_len));
memcpy_check(conn->our_quic_transport_parameters.data, data_buffer, data_len);
return S2N_SUCCESS;
}
int s2n_connection_get_quic_transport_parameters(struct s2n_connection *conn,
const uint8_t **data_buffer, uint16_t *data_len)
{
notnull_check(conn);
notnull_check(data_buffer);
notnull_check(data_len);
*data_buffer = conn->peer_quic_transport_parameters.data;
*data_len = conn->peer_quic_transport_parameters.size;
return S2N_SUCCESS;
}
int s2n_connection_set_secret_callback(struct s2n_connection *conn, s2n_secret_cb cb_func, void *ctx)
{
notnull_check(conn);
notnull_check(cb_func);
conn->secret_cb = cb_func;
conn->secret_cb_context = ctx;
return S2N_SUCCESS;
}
/* When using QUIC, S2N reads unencrypted handshake messages instead of encrypted records.
* This method sets up the S2N input buffers to match the results of using s2n_read_full_record.
*/
S2N_RESULT s2n_quic_read_handshake_message(struct s2n_connection *conn, uint8_t *message_type)
{
ENSURE_REF(conn);
/* Allocate stuffer space now so that we don't have to realloc later in the handshake. */
GUARD_AS_RESULT(s2n_stuffer_resize_if_empty(&conn->in, S2N_EXPECTED_QUIC_MESSAGE_SIZE));
GUARD_RESULT(s2n_read_in_bytes(conn, &conn->handshake.io, TLS_HANDSHAKE_HEADER_LENGTH));
uint32_t message_len;
GUARD_AS_RESULT(s2n_handshake_parse_header(conn, message_type, &message_len));
GUARD_AS_RESULT(s2n_stuffer_reread(&conn->handshake.io));
ENSURE(message_len < S2N_MAXIMUM_HANDSHAKE_MESSAGE_LENGTH, S2N_ERR_BAD_MESSAGE);
GUARD_RESULT(s2n_read_in_bytes(conn, &conn->in, message_len));
return S2N_RESULT_OK;
}
/* When using QUIC, S2N writes unencrypted handshake messages instead of encrypted records.
* This method sets up the S2N output buffer to match the result of using s2n_record_write.
*/
S2N_RESULT s2n_quic_write_handshake_message(struct s2n_connection *conn, struct s2n_blob *in)
{
ENSURE_REF(conn);
/* Allocate stuffer space now so that we don't have to realloc later in the handshake. */
GUARD_AS_RESULT(s2n_stuffer_resize_if_empty(&conn->out, S2N_EXPECTED_QUIC_MESSAGE_SIZE));
GUARD_AS_RESULT(s2n_stuffer_write(&conn->out, in));
return S2N_RESULT_OK;
}
|
