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Simulate closing the connection mid-message

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Simulate the server closing the connection after a partial handshake
message.

These test cases don't send a close_notify alert. The test cases
"insert alert record" exercise what happens if the server sends an alert.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2025-03-10 14:16:46 +01:00 committed by Manuel Pégourié-Gonnard
parent 5e3c0bd82b
commit 84ccbd8002
2 changed files with 55 additions and 0 deletions
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47
tests/suites/test_suite_ssl.function
View File

@ -109,6 +109,7 @@ static void resize_buffers(int mfl, int renegotiation, int legacy_renegotiation,
typedef enum {
RECOMBINE_NOMINAL, /* param: ignored */
RECOMBINE_SPLIT_FIRST, /* param: offset of split (<=0 means from end) */
RECOMBINE_TRUNCATE_FIRST, /* param: offset of truncation (<=0 means from end) */
RECOMBINE_INSERT_EMPTY, /* param: offset (<0 means from end) */
RECOMBINE_INSERT_RECORD, /* param: record type */
RECOMBINE_COALESCE, /* param: min number of records */
@ -160,6 +161,39 @@ exit:
return -1;
}
/* Truncate the first record, keeping only the first offset bytes.
* If offset is zero or negative, count from the end of the record.
* Remove the subsequent records.
*/
static int recombine_truncate_first_record(mbedtls_test_ssl_buffer *buf,
int offset)
{
const size_t header_length = 5;
TEST_LE_U(header_length, buf->content_length);
size_t record_length = MBEDTLS_GET_UINT16_BE(buf->buffer, header_length - 2);
if (offset > 0) {
TEST_LE_S(offset, record_length);
} else {
TEST_LE_S(-offset, record_length);
offset = record_length + offset;
}
/* Adjust the length of the first record */
MBEDTLS_PUT_UINT16_BE(offset, buf->buffer, header_length - 2);
/* Wipe the rest */
size_t truncated_end = header_length + offset;
memset(buf->buffer + truncated_end, '!',
buf->content_length - truncated_end);
buf->content_length = truncated_end;
return 0;
exit:
return -1;
}
/* Insert an empty record at the given offset. If offset is negative,
* count from the end of the first record. */
static int recombine_insert_record(mbedtls_test_ssl_buffer *buf,
@ -307,6 +341,11 @@ static int recombine_records(mbedtls_test_ssl_endpoint *server,
TEST_LE_S(0, ret);
break;
case RECOMBINE_TRUNCATE_FIRST:
ret = recombine_truncate_first_record(buf, param);
TEST_LE_S(0, ret);
break;
case RECOMBINE_INSERT_EMPTY:
/* Insert an empty handshake record. */
ret = recombine_insert_record(buf, param, MBEDTLS_SSL_MSG_HANDSHAKE);
@ -3204,6 +3243,14 @@ void recombine_server_first_flight(int version,
/* Server: parse the first flight from the client
* and emit the second flight from the server */
if (instruction == RECOMBINE_TRUNCATE_FIRST) {
/* Close without a notification. The case of closing with a
* notification is tested via RECOMBINE_INSERT_RECORD to insert
* an alert record (which we reject, making the client SSL
* context become invalid). */
mbedtls_test_mock_socket_close(&server.socket);
goto goal_reached;
}
while (ret == 0 && !mbedtls_ssl_is_handshake_over(&server.ssl)) {
mbedtls_test_set_step(1000 + server.ssl.state);
ret = mbedtls_ssl_handshake_step(&server.ssl);

8
tests/suites/test_suite_ssl.records.data
View File

@ -67,6 +67,14 @@ Recombine server flight 1: TLS 1.3, split first at 1 (bad)
depends_on:MBEDTLS_SSL_PROTO_TLS1_3
recombine_server_first_flight:MBEDTLS_SSL_VERSION_TLS1_3:RECOMBINE_SPLIT_FIRST:1:"handshake message too short\: 1":"":MBEDTLS_SSL_SERVER_HELLO:MBEDTLS_ERR_SSL_INVALID_RECORD
Recombine server flight 1: TLS 1.2, truncate at 4 (bad)
depends_on:MBEDTLS_SSL_PROTO_TLS1_2
recombine_server_first_flight:MBEDTLS_SSL_VERSION_TLS1_2:RECOMBINE_TRUNCATE_FIRST:4:"initial handshake fragment\: 4, 0..4 of":"":MBEDTLS_SSL_SERVER_HELLO:MBEDTLS_ERR_SSL_WANT_READ
Recombine server flight 1: TLS 1.3, truncate at 4 (bad)
depends_on:MBEDTLS_SSL_PROTO_TLS1_3
recombine_server_first_flight:MBEDTLS_SSL_VERSION_TLS1_3:RECOMBINE_TRUNCATE_FIRST:4:"initial handshake fragment\: 4, 0..4 of":"":MBEDTLS_SSL_SERVER_HELLO:MBEDTLS_ERR_SSL_WANT_READ
Recombine server flight 1: TLS 1.2, insert empty record after first (bad)
depends_on:MBEDTLS_SSL_PROTO_TLS1_2
recombine_server_first_flight:MBEDTLS_SSL_VERSION_TLS1_2:RECOMBINE_SPLIT_FIRST:0:"rejecting empty record":"":MBEDTLS_SSL_SERVER_CERTIFICATE:MBEDTLS_ERR_SSL_INVALID_RECORD