TclTLS
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Comment:Added master key, is server, and ticket lifetime to connection status. Reordered connection status results for better grouping.
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SHA3-256: 4e75be42e6e5ef2521b67f89d3a0aaf3f2eec8e43e3e11c0e2036945dea093d4
User & Date: bohagan on 2023-06-10 21:25:00
Other Links: branch diff | manifest | tags
Context
2023-06-11
02:27
Added more X509 certificate status info, show algorithm names, list used extensions, etc. check-in: 7265279af2 user: bohagan tags: status_x509
2023-06-10
21:25
Added master key, is server, and ticket lifetime to connection status. Reordered connection status results for better grouping. check-in: 4e75be42e6 user: bohagan tags: status_x509
20:33
Set protocol version method based on client or server option. check-in: 50c71137cb user: bohagan tags: status_x509
Changes
Unified Diff Ignore Whitespace Patch
Modified doc/tls.html from [a8f4986247] to [4bc13cff59].
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    <dd>Returns the current connection status of an SSL channel. The
        result is a list of key-value pairs describing the
        connected peer.</dd>

<blockquote>
    <dl>
        <dt><strong>state</strong> <em>state</em></dt>
        <dd>State of the connection: initializing, handshake, established</dd>
        <dt><strong>servername</strong> <em>name</em></dt>
        <dd>The name of the connected to server.</dd>
        <dt><strong>protocol</strong> <em>version</em></dt>
        <dd>The protocol version used for the connection:
	    SSL2, SSL3, TLS1, TLS1.1, TLS1.2, TLS1.3, or unknown.</dd>
        <dt><strong>renegotiation</strong> <em>state</em></dt>
        <dd>Whether protocol renegotiation is allowed or disallowed.</dd>
        <dt><strong>alpn</strong> <em>protocol</em></dt>
        <dd>The protocol selected after Application-Layer Protocol
	    Negotiation (ALPN).</dd>
        <dt><strong>securitylevel</strong> <em>level</em></dt>
        <dd>The security level used for selection of ciphers, key size, etc.</dd>




        <dt><strong>cipher</strong> <em>cipher</em></dt>
        <dd>The current cipher in use for the connection.</dd>
        <dt><strong>standard_name</strong> <em>name</em></dt>
        <dd>The standard RFC name of cipher.</dd>
        <dt><strong>bits</strong> <em>n</em></dt>
        <dd>The number of processed bits used for cipher.</dd>
        <dt><strong>secret_bits</strong> <em>n</em></dt>
        <dd>The number of secret bits used for cipher.</dd>
        <dt><strong>min_version</strong> <em>version</em></dt>
        <dd>The minimum protocol version for cipher.</dd>


        <dt><strong>description</strong> <em>string</em></dt>
        <dd>A text description of the cipher.</dd>
        <dt><strong>session_reused</strong> <em>boolean</em></dt>
        <dd>Whether the session has been reused or not.</dd>
        <dt><strong>session_id</strong> <em>string</em></dt>
        <dd>Unique session id for use in resuming the session.</dd>
        <dt><strong>session_ticket</strong> <em>string</em></dt>
        <dd>Unique session ticket for use in resuming the session.</dd>
        <dt><strong>resumable</strong> <em>boolean</em></dt>
        <dd>Can the session be resumed or not.</dd>
        <dt><strong>start_time</strong> <em>seconds</em></dt>
        <dd>Time since session started in seconds since epoch.</dd>
        <dt><strong>timeout</strong> <em>seconds</em></dt>
        <dd>Max duration of session in seconds before time-out.</dd>










        <dt><strong>compression</strong> <em>mode</em></dt>
        <dd>Compression method.</dd>
        <dt><strong>expansion</strong> <em>mode</em></dt>
        <dd>Expansion method.</dd>
        <dt><strong>session_cache_mode</strong> <em>mode</em></dt>
        <dd>Server cache mode (client, server, or both).</dd>
    </dl>








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    <dd>Returns the current connection status of an SSL channel. The
        result is a list of key-value pairs describing the
        connected peer.</dd>

<blockquote>
    <dl>
        <dt><strong>state</strong> <em>state</em></dt>
        <dd>State of the connection.</dd>
        <dt><strong>servername</strong> <em>name</em></dt>
        <dd>The name of the connected to server.</dd>
        <dt><strong>protocol</strong> <em>version</em></dt>
        <dd>The protocol version used for the connection:
	    SSL2, SSL3, TLS1, TLS1.1, TLS1.2, TLS1.3, or unknown.</dd>
        <dt><strong>renegotiation</strong> <em>state</em></dt>
        <dd>Whether protocol renegotiation is allowed or disallowed.</dd>



        <dt><strong>securitylevel</strong> <em>level</em></dt>
        <dd>The security level used for selection of ciphers, key size, etc.</dd>
        <dt><strong>session_reused</strong> <em>boolean</em></dt>
        <dd>Whether the session has been reused or not.</dd>
        <dt><strong>is_server</strong> <em>boolean</em></dt>
        <dd>Whether the connection configured as a server or client (false).</dd>
        <dt><strong>cipher</strong> <em>cipher</em></dt>
        <dd>The current cipher in use for the connection.</dd>
        <dt><strong>standard_name</strong> <em>name</em></dt>
        <dd>The standard RFC name of cipher.</dd>
        <dt><strong>bits</strong> <em>n</em></dt>
        <dd>The number of processed bits used for cipher.</dd>
        <dt><strong>secret_bits</strong> <em>n</em></dt>
        <dd>The number of secret bits used for cipher.</dd>
        <dt><strong>min_version</strong> <em>version</em></dt>
        <dd>The minimum protocol version for cipher.</dd>
        <dt><strong>id</strong> <em>id</em></dt>
        <dd>The OpenSSL cipher id.</dd>
        <dt><strong>description</strong> <em>string</em></dt>
        <dd>A text description of the cipher.</dd>


        <dt><strong>alpn</strong> <em>protocol</em></dt>
        <dd>The protocol selected after Application-Layer Protocol

	    Negotiation (ALPN).</dd>
        <dt><strong>resumable</strong> <em>boolean</em></dt>
        <dd>Can the session be resumed or not.</dd>
        <dt><strong>start_time</strong> <em>seconds</em></dt>
        <dd>Time since session started in seconds since epoch.</dd>
        <dt><strong>timeout</strong> <em>seconds</em></dt>
        <dd>Max duration of session in seconds before time-out.</dd>
        <dt><strong>lifetime</strong> <em>seconds</em></dt>
        <dd>Session ticket lifetime hint in seconds.</dd>
        <dt><strong>session_id</strong> <em>string</em></dt>
        <dd>Unique session id for use in resuming the session.</dd>
        <dt><strong>session_ticket</strong> <em>string</em></dt>
        <dd>Unique session ticket for use in resuming the session.</dd>
        <dt><strong>ticket_app_data</strong> <em>string</em></dt>
        <dd>Unique session ticket application data.</dd>
        <dt><strong>master_key</strong> <em>binary_string</em></dt>
        <dd>Unique session master key.</dd>
        <dt><strong>compression</strong> <em>mode</em></dt>
        <dd>Compression method.</dd>
        <dt><strong>expansion</strong> <em>mode</em></dt>
        <dd>Expansion method.</dd>
        <dt><strong>session_cache_mode</strong> <em>mode</em></dt>
        <dd>Server cache mode (client, server, or both).</dd>
    </dl>
︙︙
Modified generic/tls.c from [a24507cd1f] to [34dae888de].
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    X509 *peer;
    Tcl_Obj *objPtr;
    Tcl_Channel chan;
    char *channelName, *ciphers;
    int mode;
    const unsigned char *proto;
    unsigned int len;
    char *peername = NULL;

    dprintf("Called");

    switch (objc) {
	case 2:
	    channelName = Tcl_GetStringFromObj(objv[1], NULL);
	    break;








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    X509 *peer;
    Tcl_Obj *objPtr;
    Tcl_Channel chan;
    char *channelName, *ciphers;
    int mode;
    const unsigned char *proto;
    unsigned int len;


    dprintf("Called");

    switch (objc) {
	case 2:
	    channelName = Tcl_GetStringFromObj(objv[1], NULL);
	    break;
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    /* Peer cert chain (client only) */
    STACK_OF(X509)* ssl_certs = SSL_get_peer_cert_chain(statePtr->ssl);
    if (!peer && (ssl_certs == NULL || sk_X509_num(ssl_certs) == 0)) {
	return TCL_ERROR;
    }

    /* Peer name from cert */
    if (SSL_get_verify_result(statePtr->ssl) == X509_V_OK) {
	peername = SSL_get0_peername(statePtr->ssl);
    }
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("peername", -1));
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(peername, -1));

    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("sbits", -1));
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewIntObj(SSL_get_cipher_bits(statePtr->ssl, NULL)));

    ciphers = (char*)SSL_get_cipher(statePtr->ssl);
    if ((ciphers != NULL) && (strcmp(ciphers, "(NONE)") != 0)) {
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("cipher", -1));








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    /* Peer cert chain (client only) */
    STACK_OF(X509)* ssl_certs = SSL_get_peer_cert_chain(statePtr->ssl);
    if (!peer && (ssl_certs == NULL || sk_X509_num(ssl_certs) == 0)) {
	return TCL_ERROR;
    }

    /* Peer name from cert */



    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("peername", -1));
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_get0_peername(statePtr->ssl), -1));

    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("sbits", -1));
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewIntObj(SSL_get_cipher_bits(statePtr->ssl, NULL)));

    ciphers = (char*)SSL_get_cipher(statePtr->ssl);
    if ((ciphers != NULL) && (strcmp(ciphers, "(NONE)") != 0)) {
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("cipher", -1));
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    }
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(proto, -1));

    /* Report the selected protocol as a result of the negotiation */
    SSL_get0_alpn_selected(statePtr->ssl, &proto, &len);
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("alpn", -1));
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj((char *)proto, (int)len));
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("version", -1));
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_get_version(statePtr->ssl), -1));

    Tcl_SetObjResult(interp, objPtr);
    return TCL_OK;
	clientData = clientData;
}









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    }
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(proto, -1));

    /* Report the selected protocol as a result of the negotiation */
    SSL_get0_alpn_selected(statePtr->ssl, &proto, &len);
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("alpn", -1));
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj((char *)proto, (int)len));
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("protocol", -1));
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_get_version(statePtr->ssl), -1));

    Tcl_SetObjResult(interp, objPtr);
    return TCL_OK;
	clientData = clientData;
}
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    Tcl_Channel chan;		/* The channel to set a mode on. */
    State *statePtr;		/* client state for ssl socket */
    Tcl_Obj *objPtr;
    const SSL *ssl;
    const SSL_CIPHER *cipher;
    const SSL_SESSION *session;
    const unsigned char *proto;
    unsigned int len;
    long mode;

    if (objc != 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "channel");
	return(TCL_ERROR);
    }









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    Tcl_Channel chan;		/* The channel to set a mode on. */
    State *statePtr;		/* client state for ssl socket */
    Tcl_Obj *objPtr;
    const SSL *ssl;
    const SSL_CIPHER *cipher;
    const SSL_SESSION *session;
    const unsigned char *proto;

    long mode;

    if (objc != 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "channel");
	return(TCL_ERROR);
    }
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    statePtr = (State *)Tcl_GetChannelInstanceData(chan);
    ssl = statePtr->ssl;
    if (ssl != NULL) {
	/* connection state */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("state", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_state_string_long(ssl), -1));

	/* Get server name */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("servername", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name), -1));

	/* Get protocol */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("protocol", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_get_version(ssl), -1));

	/* Renegotiation allowed */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("renegotiation", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(
	    SSL_get_secure_renegotiation_support(ssl) ? "supported" : "not supported", -1));

	/* Report the selected protocol as a result of the ALPN negotiation */
	SSL_get0_alpn_selected(ssl, &proto, &len);
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("alpn", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj((char *)proto, (int)len));

	/* Get security level */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("securitylevel", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewIntObj(SSL_get_security_level(ssl)));








    }

    /* Cipher info */
    cipher = SSL_get_current_cipher(ssl);
    if (cipher != NULL) {
	char buf[BUFSIZ] = {0};
	int bits, alg_bits;








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    statePtr = (State *)Tcl_GetChannelInstanceData(chan);
    ssl = statePtr->ssl;
    if (ssl != NULL) {
	/* connection state */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("state", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_state_string_long(ssl), -1));

	/* Get SNI requested server name */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("servername", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name), -1));

	/* Get protocol */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("protocol", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_get_version(ssl), -1));

	/* Renegotiation allowed */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("renegotiation", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(
	    SSL_get_secure_renegotiation_support(ssl) ? "supported" : "not supported", -1));






	/* Get security level */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("securitylevel", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewIntObj(SSL_get_security_level(ssl)));

	/* Session info */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("session_reused", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewBooleanObj(SSL_session_reused(ssl)));

	/* Is server info */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("is_server", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewBooleanObj(SSL_is_server(ssl)));
    }

    /* Cipher info */
    cipher = SSL_get_current_cipher(ssl);
    if (cipher != NULL) {
	char buf[BUFSIZ] = {0};
	int bits, alg_bits;
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	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("secret_bits", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewIntObj(alg_bits));
	/* alg_bits is actual key secret bits. If use bits and secret (algorithm) bits differ,
           the rest of the bits are fixed, i.e. for limited export ciphers (bits < 56) */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("min_version", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_CIPHER_get_version(cipher), -1));





	if (SSL_CIPHER_description(cipher, buf, sizeof(buf)) != NULL) {
	    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("description", -1));
	    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(buf, -1));
	}
    }

    /* Session info */
    session = SSL_get_session(ssl);
    if (session != NULL) {
	const unsigned char *ticket;
	size_t len2;

	const unsigned char *session_id;

	/* Session info */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("session_reused", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewIntObj(SSL_session_reused(ssl)));


	/* Session id */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("session_id", -1));
	session_id = SSL_SESSION_get_id(session, &len);
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(session_id, (int)len));

	/* Session ticket - client only */
	SSL_SESSION_get0_ticket(session, &ticket, &len2);
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("session_ticket", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(ticket, (int) len2));

	/* Resumable session */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("resumable", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewIntObj(SSL_SESSION_is_resumable(session)));

	/* Start time */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("start_time", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewLongObj(SSL_SESSION_get_time(session)));

	/* Timeout value */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("timeout", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewLongObj(SSL_SESSION_get_timeout(session)));
























    }

    /* Compression info */
    if (ssl != NULL) {
#ifdef HAVE_SSL_COMPRESSION
	const COMP_METHOD *comp, *expn;
	comp = SSL_get_current_compression(ssl);








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	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("secret_bits", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewIntObj(alg_bits));
	/* alg_bits is actual key secret bits. If use bits and secret (algorithm) bits differ,
           the rest of the bits are fixed, i.e. for limited export ciphers (bits < 56) */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("min_version", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_CIPHER_get_version(cipher), -1));

	/* Get OpenSSL-specific ID, not IANA ID */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("id", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewIntObj((int) SSL_CIPHER_get_id(cipher)));

	if (SSL_CIPHER_description(cipher, buf, sizeof(buf)) != NULL) {
	    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("description", -1));
	    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(buf, -1));
	}
    }

    /* Session info */
    session = SSL_get_session(ssl);
    if (session != NULL) {
	const unsigned char *ticket;
	size_t len2;
	unsigned int ulen;
	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, &len);
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("alpn", -1));

	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj((char *)proto, (int) len));

	/* Peer */

	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("peer", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_SESSION_get0_peer(session), -1));

	/* Resumable session */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("resumable", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewIntObj(SSL_SESSION_is_resumable(session)));

	/* Start time */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("start_time", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewLongObj(SSL_SESSION_get_time(session)));

	/* Timeout value */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("timeout", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewLongObj(SSL_SESSION_get_timeout(session)));

	/* Lifetime hint */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("lifetime", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewLongObj(SSL_SESSION_get_ticket_lifetime_hint(session)));

	/* Session id */
	session_id = SSL_SESSION_get_id(session, &ulen);
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("session_id", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewByteArrayObj(session_id, (int) ulen));

	/* Session ticket - client only */
	SSL_SESSION_get0_ticket(session, &ticket, &len2);
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("session_ticket", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewByteArrayObj(ticket, (int) len2));

	/* Ticket app data */
	SSL_SESSION_get0_ticket_appdata(session, &ticket, &len2);
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("ticket_app_data", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewByteArrayObj(ticket, (int) len2));

	/* Get master key */
	len2 = SSL_SESSION_get_master_key(session, buffer, SSL_MAX_MASTER_KEY_LENGTH);
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("master_key", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewByteArrayObj(buffer, (int) len2));
    }

    /* Compression info */
    if (ssl != NULL) {
#ifdef HAVE_SSL_COMPRESSION
	const COMP_METHOD *comp, *expn;
	comp = SSL_get_current_compression(ssl);
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