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ktls: improve messaging around freed handshakes #4346

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merged 3 commits into from
Jan 9, 2024
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ktls: improve messaging around freed handshakes #4346

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ktls: improve messaging around freed handshakes
lrstewart Jan 8, 2024
6e4a2b9
Move check, add comment
lrstewart Jan 9, 2024
b704884
Merge branch 'main' into ktls_fix
lrstewart Jan 9, 2024
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6 changes: 4 additions & 2 deletions api/unstable/ktls.h
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Original file line number Diff line number Diff line change
Expand Up @@ -44,7 +44,8 @@
* Enables sending using kTLS on a given connection.
*
* See above for the limitations on when kTLS can be enabled. Additionally,
* s2n_connection_ktls_enable_send must be called after the handshake completes.
* s2n_connection_ktls_enable_send must be called after the handshake completes
* but before the handshake is freed with s2n_connection_free_handshake.
* It may be called after some application data is sent and received without kTLS,
* but there must be no pending application data that requires flushing. If these
* requirements are not met, enabling kTLS will fail with an error.
Expand Down Expand Up @@ -74,7 +75,8 @@ S2N_API int s2n_connection_ktls_enable_send(struct s2n_connection *conn);
* Enables receiving using kTLS on a given connection.
*
* See above for the limitations on when kTLS can be enabled. Additionally,
* s2n_connection_ktls_enable_recv must be called after the handshake completes.
* s2n_connection_ktls_enable_recv must be called after the handshake completes
* but before the handshake is freed with s2n_connection_free_handshake.
* It may be called after some application data is sent and received without kTLS,
* but there must be no buffered application data that requires draining. If these
* requirements are not met, enabling kTLS will fail with an error.
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1 change: 1 addition & 0 deletions tls/s2n_ktls.c
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Expand Up @@ -160,6 +160,7 @@ static S2N_RESULT s2n_ktls_crypto_info_init(struct s2n_connection *conn, s2n_ktl

switch (conn->actual_protocol_version) {
case S2N_TLS12:
RESULT_ENSURE(conn->prf_space, S2N_ERR_INVALID_STATE);
RESULT_GUARD(s2n_prf_generate_key_material(conn, &key_material));
break;
case S2N_TLS13:
Expand Down
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