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| User & Date: | bohagan on 2024-02-10 21:04:21 |
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2024-02-10
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| 22:03 | Updated callback info in doc file check-in: a1c3e96ef5 user: bohagan tags: trunk | |
| 21:04 | Updated debug documentation check-in: e8ed4fea49 user: bohagan tags: trunk | |
| 20:37 | Refactored set default CA certificates path and file to allow env vars to override defaults. check-in: cdb6cd6aa6 user: bohagan tags: trunk | |
Changes
Modified doc/tls.html from [ec5645fd47] to [1b5bf51939].
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<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=iso-8859-1">
<meta name="Copyright" content="1999 Matt Newman / 2004 Starfish Systems">
<title>TLS (SSL) TCL Commands</title>
<link rel="stylesheet" href="docs.css" type="text/css" media="all">
</head>
<body class="vsc-initialized">
<h2>Tcl Tls Extension Documentation</h2>
<dl>
<dd><a href="#NAME">NAME</a>
<dl>
<dd><b>tls</b> - binding to <b>OpenSSL</b> library
for socket and I/O channel communications.</dd>
</dl>
</dd>
<dd><a href="#SYNOPSIS">SYNOPSIS</a> </dd>
<dd><dl>
<dd><b>package require Tcl</b> <em>?8.5?</em></dd>
<dd><b>package require tls</b></dd>
<dt> </dt>
<dd><b>tls::init</b> <em>?options?</em> </dd>
<dd><b>tls::socket</b> <em>?options? host port</em></dd>
<dd><b>tls::socket</b> <em>?-server command? ?options? port</em></dd>
<dd><b>tls::handshake</b> <em> channel</em></dd>
<dd><b>tls::status</b> <em>?-local? channel</em></dd>
<dd><b>tls::connection</b> <em>channel</em></dd>
<dd><b>tls::import</b> <em>channel ?options?</em></dd>
<dd><b>tls::unimport</b> <em>channel</em></dd>
<dt> </dt>
<dd><b>tls::protocols</b></dd>
<dd><b>tls::version</b></dd>
</dl>
</dd>
<dd><a href="#COMMANDS">COMMANDS</a></dd>
<dd><a href="#CALLBACK OPTIONS">CALLBACK OPTIONS</a></dd>
<dd><a href="#HTTPS EXAMPLE">HTTPS EXAMPLE</a></dd>
<dd><a href="#SEE ALSO">SPECIAL CONSIDERATIONS</a></dd>
<dd><a href="#SEE ALSO">SEE ALSO</a></dd>
</dl>
<hr>
<h3><a name="NAME">NAME</a></h3>
<p><strong>tls</strong> - binding to <strong>OpenSSL</strong> library
for socket and I/O channel communications.</p>
<h3><a name="SYNOPSIS">SYNOPSIS</a></h3>
<p><b>package require Tcl 8.5</b><br>
<b>package require tls</b><br>
<br>
<a href="#tls::init"><b>tls::init</b> <i>?options?</i></a><br>
<a href="#tls::socket"><b>tls::socket</b> <i>?options? host port</i><br>
<a href="#tls::socket"><b>tls::socket</b> <i>?-server command? ?options? port</i></a><br>
<a href="#tls::status"><b>tls::status</b> <i>?-local? channel</i></a><br>
<a href="#tls::connection"><b>tls::connection</b> <i>channel</i></a><br>
<a href="#tls::handshake"><b>tls::handshake</b> <i>channel</i></a><br>
<a href="#tls::import"><b>tls::import</b> <i>channel ?options?</i></a><br>
<a href="#tls::unimport"><b>tls::unimport</b> <i>channel</i></a><br>
<br>
<a href="#tls::protocols"><b>tls::protocols</b></a><br>
<a href="#tls::version"><b>tls::version</b></a><br>
</p>
<h3><a name="DESCRIPTION">DESCRIPTION</a></h3>
<p>This extension provides a generic binding to <a
href="http://www.openssl.org/">OpenSSL</a>, utilizing the
<strong>Tcl_StackChannel</strong>
|
| ︙ | ︙ | |||
97 98 99 100 101 102 103 |
<dt> </dt>
<dt><a name="tls::socket"><b>tls::socket </b><em>?options?
host port</em></a></dt>
<dt><b>tls::socket</b><em> ?-server command? ?options? port</em></dt>
<dd>This is a helper function that utilizes the underlying
commands (<strong>tls::import</strong>). It behaves
exactly the same as the native Tcl <strong>socket</strong>
| | | | | | | | | 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 |
<dt> </dt>
<dt><a name="tls::socket"><b>tls::socket </b><em>?options?
host port</em></a></dt>
<dt><b>tls::socket</b><em> ?-server command? ?options? port</em></dt>
<dd>This is a helper function that utilizes the underlying
commands (<strong>tls::import</strong>). It behaves
exactly the same as the native Tcl <strong>socket</strong>
command except the options can also include any of the
applicable <a href="#tls::import"><strong>tls:import</strong></a>
options with one additional option:</dd>
<blockquote>
<dl>
<dt><strong>-autoservername</strong> <em>bool</em></dt>
<dd>Automatically set the -servername argument to the <em>host</em>
argument (default is <em>false</em>).</dd>
</dl>
</blockquote>
<dt><a name="tls::import"><b>tls::import </b><i>channel
?options?</i></a></dt>
<dd>Add SSL/TLS encryption to a regular Tcl channel. It need
not be a socket, but must provide bi-directional flow. Also
set session parameters for SSL handshake.</dd>
<blockquote>
<dl>
<dt><strong>-alpn</strong> <em>list</em></dt>
<dd>List of protocols to offer during Application-Layer
Protocol Negotiation (ALPN). For example: <em>h2</em> and
<em>http/1.1</em>, but not <em>h3</em> or <em>quic</em>.</dd>
|
| ︙ | ︙ | |||
135 136 137 138 139 140 141 |
<dt><strong>-certfile</strong> <em>filename</em></dt>
<dd>Specify the filename with the certificate to use.</dd>
<dt><strong>-cert</strong> <em>filename</em></dt>
<dd>Specify the contents of a certificate to use, as a DER
encoded binary value (X.509 DER).</dd>
<dt><strong>-cipher</strong> <em>string</em></dt>
<dd>List of ciphers to use. String is a colon (":") separated list
| | | | | > > | | > | | | < | | > | | | > | | | < | > | | < | 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 |
<dt><strong>-certfile</strong> <em>filename</em></dt>
<dd>Specify the filename with the certificate to use.</dd>
<dt><strong>-cert</strong> <em>filename</em></dt>
<dd>Specify the contents of a certificate to use, as a DER
encoded binary value (X.509 DER).</dd>
<dt><strong>-cipher</strong> <em>string</em></dt>
<dd>List of ciphers to use. String is a colon (":") separated list
of ciphers. Ciphers can be combined
using the <b>+</b> character. Prefixes can be used to permanently
remove ("!"), delete ("-"), or move a cypher to the end of
the list ("+"). Keywords <b>@STRENGTH</b> (sort by algorithm
key length), <b>@SECLEVEL=</b><i>n</i> (set security level to
n), and <b>DEFAULT</b> (use default cipher list, at start only)
can also be specified. See OpenSSL documentation for the full
list of valid values. (TLS 1.2 and earlier only)</dd>
<dt><strong>-ciphersuites</strong> <em>string</em></dt>
<dd>List of cipher suites to use. String is a colon (":")
separated list of cipher suite names. (TLS 1.3 only)</dd>
<dt><strong>-command</strong> <em>callback</em></dt>
<dd>Callback command to invoke at several points during the handshake.
This is used to pass errors and tracing information, and
it can allow Tcl scripts to perform their own certificate
validation in place of the default validation provided by
OpenSSL. See <a href="#CALLBACK OPTIONS">CALLBACK OPTIONS</a>
for further discussion.</dd>
<dt><strong>-dhparams </strong><em>filename</em></dt>
<dd>Specify the Diffie-Hellman parameters file.</dd>
<dt><strong>-keyfile</strong> <em>filename</em></dt>
<dd>Specify the private key file. (default is
value of -certfile)</dd>
<dt><strong>-key</strong> <em>filename</em></dt>
<dd>Specify the private key to use as a DER encoded value (PKCS#1 DER)</dd>
<dt><strong>-model</strong> <em>channel</em></dt>
<dd>Force this channel to share the same <em><strong>SSL_CTX</strong></em>
structure as the specified <em>channel</em>, and
therefore share callbacks etc.</dd>
<dt><strong>-password</strong> <em>callback</em></dt>
<dd>Callback command to invoke when OpenSSL needs to obtain a password.
Typically used to unlock the private key of a certificate. The
callback should return a string which represents the password
to be used. See <a href="#CALLBACK OPTIONS">CALLBACK OPTIONS</a>
for further discussion.</dd>
<dt><strong>-post_handshake</strong> <em>bool</em></dt>
<dd>Allow post-handshake ticket updates.</dd>
<dt><strong>-request </strong><em>bool</em></dt>
<dd>Request a certificate from peer during SSL handshake.
(default is <em>true</em>)</dd>
<dt><strong>-require</strong> <em>bool</em></dt>
<dd>Require a valid certificate from peer during SSL handshake.
If this is set to true, then <strong>-request</strong> must
also be set to true and a either a -cadir, -cafile, or platform
default must be provided in order to validate against.
(default is <em>false</em>)</dd>
<dt><strong>-security_level</strong> <em>integer</em></dt>
<dd>Set security level. Must be 0 to 5. The security level affects
the cipher suite encryption algorithms, supported ECC curves,
supported signature algorithms, DH parameter sizes, certificate
key sizes and signature algorithms. The default is 1.
Level 3 and higher disable support for session tickets and only
accept cipher suites that provide forward secrecy.</dd>
<dt><strong>-server</strong> <em>bool</em></dt>
<dd>Set to act as a server and respond with a server handshake when
a client connects and provides a client handshake.
(default is <em>false</em>)</dd>
<dt><strong>-servername</strong> <em>host</em></dt>
<dd>Specify server's hostname. Used to set the TLS 'Server Name
Indication' (SNI) extension. Set to the expected servername
in the server's certificate or one of the subjectAltName
alternates.</dd>
<dt><strong>-session_id</strong> <em>string</em></dt>
<dd>Session id to resume session.</dd>
<dt><strong>-ssl2</strong> <em>bool</em></dt>
<dd>Enable use of SSL v2. (default is <em>false</em>)</dd>
<dt><strong>-ssl3 </strong><em>bool</em></dt>
<dd>Enable use of SSL v3. (default is <em>false</em>)</dd>
<dt>-<strong>tls1</strong> <em>bool</em></dt>
<dd>Enable use of TLS v1. (default is <em>true</em>)</dd>
<dt>-<strong>tls1.1</strong> <em>bool</em></dt>
<dd>Enable use of TLS v1.1 (default is <em>true</em>)</dd>
<dt>-<strong>tls1.2</strong> <em>bool</em></dt>
<dd>Enable use of TLS v1.2 (default is <em>true</em>)</dd>
<dt>-<strong>tls1.3</strong> <em>bool</em></dt>
<dd>Enable use of TLS v1.3 (default is <em>true</em>)</dd>
<dt><strong>-validatecommand</strong> <em>callback</em></dt>
<dd>Callback command to invoke to verify or validate protocol config
parameters during the protocol negotiation phase. See
<a href="#CALLBACK OPTIONS">CALLBACK OPTIONS</a>
for further discussion.</dd>
</dl>
</blockquote>
<dt><a name="tls::unimport"><b>tls::unimport </b><i>channel</i></a></dt>
<dd>Provided for symmetry to <strong>tls::import</strong>, this
unstacks the encryption of a regular Tcl channel. An error
is thrown if TLS is not the top stacked channel type.</dd>
<dt> </dt>
<dt><a name="tls::handshake"><strong>tls::handshake</strong>
<em>channel</em></a></dt>
<dd>Forces handshake to take place, and returns 0 if
handshake is still in progress (non-blocking), or 1 if
the handshake was successful. If the handshake failed
this routine will throw an error.</dd>
<dt> </dt>
<dt><a name="tls::status"><strong>tls::status</strong>
<em>?</em><b>-local</b><em>? channel</em></a></dt>
<dd>Returns the current status of an SSL channel. The result is a list
of key-value pairs describing the SSL, certificate, and certificate
verification status. If the SSL handshake has not yet completed,
an empty list is returned. If <b>-local</b> is specified, then the
local certificate is used.</dd>
<blockquote>
<b>SSL Status</b>
<dl>
<dt><strong>alpn</strong> <em>protocol</em></dt>
<dd>The protocol selected after Application-Layer Protocol
Negotiation (ALPN).</dd>
<dt><strong>cipher</strong> <em>cipher</em></dt>
<dd>The current cipher in use between for the channel.</dd>
<dt><strong>peername</strong> <em>name</em></dt>
<dd>The peername from the certificate.</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>sbits</strong> <em>n</em></dt>
<dd>The number of bits used for the session key.</dd>
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<dl>
<dt><strong>all</strong> <em>string</em></dt>
<dd>Dump of all certificate info.</dd>
<dt><strong>version</strong> <em>value</em></dt>
<dd>The certificate version.</dd>
<dt><strong>serialNumber</strong> <em>n</em></dt>
| | | 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 |
<dl>
<dt><strong>all</strong> <em>string</em></dt>
<dd>Dump of all certificate info.</dd>
<dt><strong>version</strong> <em>value</em></dt>
<dd>The certificate version.</dd>
<dt><strong>serialNumber</strong> <em>n</em></dt>
<dd>The serial number of the certificate as a hex string.</dd>
<dt><strong>signature</strong> <em>algorithm</em></dt>
<dd>Cipher algorithm used for certificate signature.</dd>
<dt><strong>issuer</strong> <em>dn</em></dt>
<dd>The distinguished name (DN) of the certificate issuer.</dd>
<dt><strong>notBefore</strong> <em>date</em></dt>
<dd>The begin date for the validity of the certificate.</dd>
<dt><strong>notAfter</strong> <em>date</em></dt>
|
| ︙ | ︙ | |||
298 299 300 301 302 303 304 | <dt><strong>num_extensions</strong> <em>n</em></dt> <dd>Number of certificate extensions.</dd> <dt><strong>extensions</strong> <em>list</em></dt> <dd>List of certificate extension names.</dd> <dt><strong>authorityKeyIdentifier</strong> <em>string</em></dt> <dd>(AKI) Key identifier of the Issuing CA certificate that signed | | | | | | | | | | | | < | | > > | > > > | > > | < < < < < < < < < < | | | 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 |
<dt><strong>num_extensions</strong> <em>n</em></dt>
<dd>Number of certificate extensions.</dd>
<dt><strong>extensions</strong> <em>list</em></dt>
<dd>List of certificate extension names.</dd>
<dt><strong>authorityKeyIdentifier</strong> <em>string</em></dt>
<dd>(AKI) Key identifier of the Issuing CA certificate that signed
the SSL certificate as a hex string. This value matches the SKI
value of the Intermediate CA certificate.</dd>
<dt><strong>subjectKeyIdentifier</strong> <em>string</em></dt>
<dd>(SKI) Hash of the public key inside the certificate as a hex
string. Used to identify certificates that contain a particular
public key.</dd>
<dt><strong>subjectAltName</strong> <em>list</em></dt>
<dd>List of all of the alternative domain names, sub domains,
and IP addresses that are secured by the certificate.</dd>
<dt><strong>ocsp</strong> <em>list</em></dt>
<dd>List of all Online Certificate Status Protocol (OCSP) URLs.</dd>
<dt><strong>certificate</strong> <em>cert</em></dt>
<dd>The PEM encoded certificate.</dd>
<dt><strong>signatureAlgorithm</strong> <em>algorithm</em></dt>
<dd>Cipher algorithm used for the certificate signature.</dd>
<dt><strong>signatureValue</strong> <em>string</em></dt>
<dd>Certificate signature as a hex string.</dd>
<dt><strong>signatureDigest</strong> <em>version</em></dt>
<dd>Certificate signing digest as a hex string.</dd>
<dt><strong>publicKeyAlgorithm</strong> <em>algorithm</em></dt>
<dd>Certificate signature public key algorithm.</dd>
<dt><strong>publicKey</strong> <em>string</em></dt>
<dd>Certificate signature public key as a hex string.</dd>
<dt><strong>bits</strong> <em>n</em></dt>
<dd>Number of bits used for certificate signature key.</dd>
<dt><strong>self_signed</strong> <em>boolean</em></dt>
<dd>Whether the certificate signature is self signed.</dd>
<dt><strong>sha1_hash</strong> <em>hash</em></dt>
<dd>The SHA1 hash of the certificate as a hex string.</dd>
<dt><strong>sha256_hash</strong> <em>hash</em></dt>
<dd>The SHA256 hash of the certificate as a hex string.</dd>
</dl>
</blockquote>
<dt><a name="tls::connection"><strong>tls::connection</strong>
<em>channel</em></a></dt>
<dd>Returns the current connection status of an SSL channel. The
result is a list of key-value pairs describing the connection.</dd>
<blockquote>
<b>SSL Status</b>
<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_allowed</strong> <em>boolean</em></dt>
<dd>Whether protocol renegotiation is supported or not.</dd>
<dt><strong>security_level</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 is configured as a server (1) or client (0).</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>caList</strong> <em>list</em></dt>
<dd>List of Certificate Authorities (CA) for X.509 certificate.</dd>
</dl>
</blockquote>
<blockquote>
<b>Cipher Info</b>
<dl>
<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>algorithm_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>cipher_is_aead</strong> <em>boolean</em></dt>
<dd>Whether the cipher is Authenticated Encryption with
Associated Data (AEAD).</dd>
<dt><strong>cipher_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>handshake_digest</strong> <em>boolean</em></dt>
<dd>Digest used during handshake.</dd>
</dl>
</blockquote>
<blockquote>
<b>Session Info</b>
<dl>
<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>Whether the session can 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>binary_string</em></dt>
<dd>Unique session id for use in resuming the session.</dd>
<dt><strong>session_ticket</strong> <em>binary_string</em></dt>
<dd>Unique session ticket for use in resuming the session.</dd>
<dt><strong>ticket_app_data</strong> <em>binary_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>session_cache_mode</strong> <em>mode</em></dt>
<dd>Server cache mode (client, server, or both).</dd>
</dl>
</blockquote>
<dt><a name="tls::protocols"><strong>tls::protocols</strong></a></dt>
<dd>Returns a list of the supported protocols. Valid values are:
<b>ssl2</b>, <b>ssl3</b>, <b>tls1</b>, <b>tls1.1</b>, <b>tls1.2</b>,
and <b>tls1.3</b>. Exact list depends on OpenSSL version and
compile time flags.</dd>
<dt><a name="tls::version"><strong>tls::version</strong></a></dt>
<dd>Returns the OpenSSL version string.</dd>
</dl>
<h3><a name="CALLBACK OPTIONS">CALLBACK OPTIONS</a></h3>
<p>
As indicated above, individual channels can be given their own callbacks
to handle intermediate processing by the OpenSSL library, using the
<strong>-command</strong>, <strong>-password</strong>, and
<strong>-validate_command</strong> options passed to either of
<strong>tls::socket</strong> or <strong>tls::import</strong>.
If the callback generates an error, the <b>bgerror</b> command will be
invoked with the error information.
</p>
<blockquote>
<dl>
<dt><strong>-command</strong> <em>callback</em></dt>
|
| ︙ | ︙ | |||
646 647 648 649 650 651 652 | internally. The default behavior when the <strong>-password</strong> option is not specified is for TLS to process the associated library callbacks by attempting to call <strong>tls::password</strong>. The difference between these two behaviors is a consequence of maintaining compatibility with earlier implementations. </p> | < < < < < < < < > > > > > > > > > > > > > > > > > > > > > | > > > > > | > > > | > > | > > > > > | > > > > | > > > > > > > > > | > | | | | | | 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 |
internally. The default behavior when the <strong>-password</strong> option is not
specified is for TLS to process the associated library callbacks by attempting
to call <strong>tls::password</strong>.
The difference between these two behaviors is a consequence of maintaining
compatibility with earlier implementations.
</p>
<p>
<em>
The use of the reference callbacks <strong>tls::callback</strong>,
<strong>tls::password</strong>, and <strong>tls::validate_command</strong>
is not recommended. They may be removed from future releases.
</em>
</p>
<h3><a name="DEBUG">DEBUG</a></h3>
TLS key logging can be enabled by setting the environment variable
<b>SSLKEYLOGFILE</b> to the name of the file to log to. Then whenever TLS
key material is generated or received it will be logged to the file. This
is useful for logging key data for network logging tools to use to
decrypt the data.
<p>
The <strong>tls::debug</strong> variable provides some additional
control over these reference callbacks. Its value is zero by default.
Higher values produce more diagnostic output, and will also force the
verify method in <strong>tls::callback</strong> to accept the
certificate, even when it is invalid if the <b>tls::validate_command</b>
callback is used for the <b>-validatecommand</b> option.
</p>
<p>
<em>
The use of the variable <strong>tls::debug</strong> is not recommended.
It may be removed from future releases.
</em>
</p>
Example:
<pre><code>
package require http
package require tls
http::register https 443 [list ::tls::socket -autoservername true -require true -cadir /etc/ssl/certs \
-command ::tls::callback -password ::tls::password -validatecommand ::tls::validate_command]
set token [http::geturl "https://www.tcl-lang.org/"]
::http::cleanup $token
</code></pre>
Example #2:
<pre><code>
package require tls
set url "www.tcl-lang.org"
set port 443
set ch [tls::socket -autoservername 1 -servername $url -request 1 -require 1 \
-alpn {http/1.1 h2} -cadir /etc/ssl/certs -command ::tls::callback \
-password ::tls::password -validatecommand ::tls::validate_command $url $port]
chan configure $ch -buffersize 65536
tls::handshake $ch
puts $ch "GET / HTTP/1.1"
flush $ch
after 500
set data [read $ch]
array set status [tls::status $ch]
array set conn [tls::connection $ch]
array set chan [chan configure $ch]
close $ch
parray status
parray conn
parray chan
</code></pre>
<h3><a name="HTTPS EXAMPLE">HTTPS EXAMPLE</a></h3>
<p>This example uses a sample server.pem provided with the TLS release,
courtesy of the <strong>OpenSSL</strong> project.</p>
<pre><code>
package require http
package require tls
http::register https 443 [list ::tls::socket -autoservername true -require true -cadir /etc/ssl/certs]
set token [http::geturl https://www.tcl.tk/]
::http::cleanup $token
</code></pre>
<h3><a name="SPECIAL CONSIDERATIONS">SPECIAL CONSIDERATIONS</a></h3>
<p>The capabilities of this package can vary enormously based upon how the
linked to OpenSSL library was configured and built. New versions may obsolete
older protocol versions, add or remove ciphers, change default values, etc.
Use the <strong>tls::protocols</strong> commands to obtain the supported
protocol versions.</p>
<h3><a name="SEE ALSO">SEE ALSO</a></h3>
<p><strong>socket</strong>, <strong>fileevent, </strong><a
href="http://www.openssl.org/"><strong>OpenSSL</strong></a></p>
<hr>
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