Overview
| Comment: | Added Next Protocol Negotiation (NPN) for TLS 1.0 to TLS 1.2. |
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| Timelines: | family | ancestors | descendants | both | errors_and_callbacks |
| Files: | files | file ages | folders |
| SHA3-256: |
f7b84d671ab40c58415240b69b4a6552 |
| User & Date: | bohagan on 2023-07-16 18:41:20 |
| Other Links: | branch diff | manifest | tags |
Context
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2023-07-21
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| 23:01 | Added new option -validatecommand to handle callbacks that require a return value. Consolidated evaluate callback commands into one function EvalCallback. Return alert codes for callbacks. Added more comments to callback functions. check-in: 91ff651d51 user: bohagan tags: errors_and_callbacks | |
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2023-07-16
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| 18:41 | Added Next Protocol Negotiation (NPN) for TLS 1.0 to TLS 1.2. check-in: f7b84d671a user: bohagan tags: errors_and_callbacks | |
| 17:26 | Added alert type to info callback parameters and refactored code. check-in: 0aa8ad9487 user: bohagan tags: errors_and_callbacks | |
Changes
Modified generic/tls.c from [a232f29e3c] to [6f8aac6c9a].
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Tcl_Release((ClientData) statePtr);
Tcl_Release((ClientData) interp); return 0;
}
/*
*-------------------------------------------------------------------
*
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Tcl_DecrRefCount(cmdPtr);
Tcl_Release((ClientData) statePtr);
Tcl_Release((ClientData) interp);
return res;
}
/*
*-------------------------------------------------------------------
*
* Advertise Protocols Callback for Servers Next Protocol Negotiation --
*
* called when a TLS server needs a list of supported protocols for Next
* Protocol Negotiation.
*
* Results:
* None
*
* Side effects:
*
* Return codes:
* SSL_TLSEXT_ERR_OK: NPN protocol selected. The connection continues.
* SSL_TLSEXT_ERR_NOACK: NPN protocol not selected. The connection continues.
*
*-------------------------------------------------------------------
*/
#ifdef USE_NPN
static int
NPNCallback(const SSL *ssl, const unsigned char **out, unsigned int *outlen, void *arg) {
State *statePtr = (State*)arg;
dprintf("Called");
if (ssl == NULL || arg == NULL) {
return SSL_TLSEXT_ERR_NOACK;
}
/* Set protocols list */
if (statePtr->protos != NULL) {
*out = statePtr->protos;
*outlen = statePtr->protos_len;
} else {
*out = NULL;
*outlen = 0;
return SSL_TLSEXT_ERR_NOACK;
}
return SSL_TLSEXT_ERR_OK;
}
#endif
/*
*-------------------------------------------------------------------
*
* SNI Callback for Servers --
*
* Perform server-side SNI hostname selection after receiving SNI header.
* Called after hello callback but before ALPN callback.
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if (server) {
/* Server callbacks */
SSL_CTX_set_tlsext_servername_arg(statePtr->ctx, (void *)statePtr);
SSL_CTX_set_tlsext_servername_callback(statePtr->ctx, SNICallback);
SSL_CTX_set_client_hello_cb(statePtr->ctx, HelloCallback, (void *)statePtr);
if (statePtr->protos != NULL) {
SSL_CTX_set_alpn_select_cb(statePtr->ctx, ALPNCallback, (void *)statePtr);
#ifdef USE_NPN
SSL_CTX_set_next_protos_advertised_cb(statePtr->ctx, NPNCallback, (void *)statePtr);
#endif
}
/* Enable server to send cert request after handshake (TLS 1.3 only) */
if (request && post_handshake) {
SSL_verify_client_post_handshake(statePtr->ssl);
}
statePtr->flags |= TLS_TCL_SERVER;
SSL_set_accept_state(statePtr->ssl);
} else {
/* Client callbacks */
if (statePtr->protos != NULL) {
#ifdef USE_NPN
SSL_CTX_set_next_proto_select_cb(statePtr->ctx, ALPNCallback, (void *)statePtr);
#endif
}
/* Session caching */
SSL_CTX_set_session_cache_mode(statePtr->ctx, SSL_SESS_CACHE_CLIENT | SSL_SESS_CACHE_NO_INTERNAL_STORE);
SSL_CTX_sess_set_new_cb(statePtr->ctx, SessionCallback);
/* Enable post handshake Authentication extension. TLS 1.3 only, not http/2. */
if (request && post_handshake) {
SSL_set_post_handshake_auth(statePtr->ssl, 1);
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const unsigned char *session_id;
char buffer[SSL_MAX_MASTER_KEY_LENGTH];
/* Report the selected protocol as a result of the ALPN negotiation */
SSL_SESSION_get0_alpn_selected(session, &proto, &len2);
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("alpn", -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj((char *)proto, (int) len2));
/* Report the selected protocol as a result of the NPN negotiation */
#ifdef USE_NPN
SSL_get0_next_proto_negotiated(ssl, &proto, &ulen);
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("npn", -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj((char *)proto, (int) ulen));
#endif
/* Resumable session */
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("resumable", -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewIntObj(SSL_SESSION_is_resumable(session)));
/* Session start time (seconds since epoch) */
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("start_time", -1));
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