This document describes the changes made to the SSL application.

## SSL 8.1

### Fixed Bugs and Malfunctions

List of possible anonymous suites, never supported by default, where incorrect for some TLS versions.

Own Id: OTP-13926

### Improvements and New Features

Experimental version of DTLS. It is runnable but not complete and cannot be considered reliable for production usage.

Own Id: OTP-12982

Add API options to handle ECC curve selection.

Own Id: OTP-13959

## SSL 8.0.3

### Fixed Bugs and Malfunctions

A timing related bug in event handling could cause interoperability problems between an erlang TLS server and some TLS clients, especially noticed with Firefox as TLS client.

Own Id: OTP-13917

Correct ECC curve selection, the error could cause the default to always be selected.

Own Id: OTP-13918

## SSL 8.0.2

### Fixed Bugs and Malfunctions

Correctly formed handshake messages received out of order will now correctly fail the connection with unexpected message.

Own Id: OTP-13853

### Improvements and New Features

ssl application now behaves gracefully also on partially incorrect input from peer.

Own Id: OTP-13834

Add application environment configuration bypass_pem_cache. This can be used as a workaround for the current implementation of the PEM-cache that has proven to be a bottleneck.

Own Id: OTP-13883

## SSL 8.0.1

### Fixed Bugs and Malfunctions

The TLS/SSL protocol version selection for the SSL server has been corrected to follow RFC 5246 Appendix E.1 especially in case where the list of supported versions has gaps. Now the server selects the highest protocol version it supports that is not higher than what the client supports.

Own Id: OTP-13753 Aux Id: seq13150

## SSL 8.0

### Fixed Bugs and Malfunctions

Server now rejects, a not requested client cert, as an incorrect handshake message and ends the connection.

Own Id: OTP-13651

### Improvements and New Features

Remove default support for DES cipher suites

*** POTENTIAL INCOMPATIBILITY ***

Own Id: OTP-13195

Deprecate the function crypto:rand_bytes and make sure that crypto:strong_rand_bytes is used in all places that are cryptographically significant.

Own Id: OTP-13214

Better error handling of user error during TLS upgrade. ERL-69 is solved by gen_statem rewrite of ssl application.

Own Id: OTP-13255

Provide user friendly error message when crypto rejects a key

Own Id: OTP-13256

Add ssl:getstat/1 and ssl:getstat/2

Own Id: OTP-13415

TLS distribution connections now allow specifying the options verify_fun, crl_check and crl_cache. See the documentation. GitHub pull req #956 contributed by Magnus Henoch.

Own Id: OTP-13429 Aux Id: Pull#956

Remove confusing error message when closing a distributed erlang node running over TLS

Own Id: OTP-13431

Remove default support for use of md5 in TLS 1.2 signature algorithms

Own Id: OTP-13463

ssl now uses gen_statem instead of gen_fsm to implement the ssl connection process, this solves some timing issues in addition to making the code more intuitive as the behaviour can be used cleanly instead of having a lot of workaround for shortcomings of the behaviour.

Own Id: OTP-13464

Phase out interoperability with clients that offer SSLv2. By default they are no longer supported, but an option to provide interoperability is offered.

*** POTENTIAL INCOMPATIBILITY ***

Own Id: OTP-13465

OpenSSL has functions to generate short (eight hex digits) hashes of issuers of certificates and CRLs. These hashes are used by the "c_rehash" script to populate directories of CA certificates and CRLs, e.g. in the Apache web server. Add functionality to let an Erlang program find the right CRL for a given certificate in such a directory.

Own Id: OTP-13530

Some legacy TLS 1.0 software does not tolerate the 1/n-1 content split BEAST mitigation technique. Add a beast_mitigation SSL option (defaulting to one_n_minus_one) to select or disable the BEAST mitigation technique.

Own Id: OTP-13629

Enhance error log messages to facilitate for users to understand the error

Own Id: OTP-13632

Increased default DH params to 2048-bit

Own Id: OTP-13636

Propagate CRL unknown CA error so that public_key validation process continues correctly and determines what should happen.

Own Id: OTP-13656

Introduce a flight concept for handshake packages. This is a preparation for enabling DTLS, however it can also have a positive effects for TLS on slow and unreliable networks.

Own Id: OTP-13678

## SSL 7.3.3

### Fixed Bugs and Malfunctions

Correct ssl:prf/5 to use the negotiated cipher suite's prf function in ssl:prf/5 instead of the default prf.

Own Id: OTP-13546

Timeouts may have the value 0, guards have been corrected to allow this

Own Id: OTP-13635

Change of internal handling of hash sign pairs as the used one enforced to much restrictions making some valid combinations unavailable.

Own Id: OTP-13670

### Improvements and New Features

Create a little randomness in sending of session invalidation messages, to mitigate load when whole table is invalidated.

Own Id: OTP-13490

## SSL 7.3.2

### Fixed Bugs and Malfunctions

Correct cipher suites conversion and gaurd expression. Caused problems with GCM cipher suites and client side option to set signature_algorithms extention values.

Own Id: OTP-13525

## SSL 7.3.1

### Fixed Bugs and Malfunctions

Corrections to cipher suite handling using the 3 and 4 tuple format in addition to commit 89d7e21cf4ae988c57c8ef047bfe85127875c70c

Own Id: OTP-13511

### Improvements and New Features

Make values for the TLS-1.2 signature_algorithms extension configurable

Own Id: OTP-13261

## SSL 7.3

### Fixed Bugs and Malfunctions

Make sure there is only one poller validator at a time for validating the session cache.

Own Id: OTP-13185

A timing related issue could cause ssl to hang, especially happened with newer versions of OpenSSL in combination with ECC ciphers.

Own Id: OTP-13253

Work around a race condition in the TLS distribution start.

Own Id: OTP-13268

Big handshake messages are now correctly fragmented in the TLS record layer.

Own Id: OTP-13306

Improve portability of ECC tests in Crypto and SSL for "exotic" OpenSSL versions.

Own Id: OTP-13311

Certificate extensions marked as critical are ignored when using verify_none

Own Id: OTP-13377

If a certificate doesn't contain a CRL Distribution Points extension, and the relevant CRL is not in the cache, and the crl_check option is not set to best_effort , the revocation check should fail.

Own Id: OTP-13378

Enable TLS distribution over IPv6

Own Id: OTP-13391

### Improvements and New Features

Improve error reporting for TLS distribution

Own Id: OTP-13219

Include options from connect, listen and accept in connection_information/1,2

Own Id: OTP-13232

Allow adding extra options for outgoing TLS distribution connections, as supported for plain TCP connections.

Own Id: OTP-13285

Use loopback as server option in TLS-distribution module

Own Id: OTP-13300

Verify certificate signature against original certificate binary.

This avoids bugs due to encoding errors when re-encoding a decode certificate. As there exists several decode step and using of different ASN.1 specification this is a risk worth avoiding.

Own Id: OTP-13334

Use application:ensure_all_started/2 instead of hard-coding dependencies

Own Id: OTP-13363

## SSL 7.2

### Fixed Bugs and Malfunctions

Honor distribution port range options

Own Id: OTP-12838

Correct supervisor specification in TLS distribution.

Own Id: OTP-13134

Correct cache timeout

Own Id: OTP-13141

Avoid crash and restart of ssl process when key file does not exist.

Own Id: OTP-13144

Enable passing of raw socket options on the format {raw,_,_,_} to the underlying socket.

Own Id: OTP-13166

Hibernation with small or a zero timeout will now work as expected

Own Id: OTP-13189

### Improvements and New Features

Add upper limit for session cache, configurable on ssl application level.

If upper limit is reached, invalidate the current cache entries, e.i the session lifetime is the max time a session will be keept, but it may be invalidated earlier if the max limit for the table is reached. This will keep the ssl manager process well behaved, not exhusting memeory. Invalidating the entries will incrementally empty the cache to make room for fresh sessions entries.

Own Id: OTP-12392

Use new time functions to measure passed time.

Own Id: OTP-12457

Improved error handling in TLS distribution

Own Id: OTP-13142

Distribution over TLS now honors the nodelay distribution flag

Own Id: OTP-13143

## SSL 7.1

### Fixed Bugs and Malfunctions

Add DER encoded ECPrivateKey as valid input format for key option.

Own Id: OTP-12974

Correct return value of default session callback module

This error had the symptom that the client check for unique session would always fail, potentially making the client session table grow a lot and causing long setup times.

Own Id: OTP-12980

### Improvements and New Features

Add possibility to downgrade an SSL/TLS connection to a tcp connection, and give back the socket control to a user process.

This also adds the possibility to specify a timeout to the ssl:close function.

Own Id: OTP-11397

Add application setting to be able to change fatal alert shutdown timeout, also shorten the default timeout. The fatal alert timeout is the number of milliseconds between sending of a fatal alert and closing the connection. Waiting a little while improves the peers chances to properly receiving the alert so it may shutdown gracefully.

Own Id: OTP-12832

## SSL 7.0

### Fixed Bugs and Malfunctions

Ignore signature_algorithm (TLS 1.2 extension) sent to TLS 1.0 or TLS 1.1 server

Own Id: OTP-12670

Improve error handling in TLS distribution module to avoid lingering sockets.

Own Id: OTP-12799 Aux Id: Tom Briden

Add option {client_renegotiation, boolean()} option to the server-side of the SSL application.

Own Id: OTP-12815

### Improvements and New Features

Add new API functions to handle CRL-verification

Own Id: OTP-10362 Aux Id: kunagi-215 [126]

Remove default support for SSL-3.0, due to Poodle vunrability in protocol specification.

Add padding check for TLS-1.0 to remove Poodle vunrability from TLS 1.0, also add the option padding_check. This option only affects TLS-1.0 connections and if set to false it disables the block cipher padding check to be able to interoperate with legacy software.

Remove default support for RC4 cipher suites, as they are consider too weak.

*** POTENTIAL INCOMPATIBILITY ***

Own Id: OTP-12390

Add support for TLS ALPN (Application-Layer Protocol Negotiation) extension.

Own Id: OTP-12580

Add SNI (Server Name Indication) support for the server side.

Own Id: OTP-12736

## SSL 6.0.1.1

### Fixed Bugs and Malfunctions

Gracefully ignore proprietary hash_sign algorithms

Own Id: OTP-12829

## SSL 6.0.1

### Fixed Bugs and Malfunctions

Terminate gracefully when receving bad input to premaster secret calculation

Own Id: OTP-12783

## SSL 6.0

### Fixed Bugs and Malfunctions

Exclude self-signed trusted anchor certificates from certificate prospective certification path according to RFC 3280.

This will avoid some unnecessary certificate processing.

Own Id: OTP-12449

### Improvements and New Features

Separate client and server session cache internally.

Avoid session table growth when client starts many connections in such a manner that many connections are started before session reuse is possible. Only save a new session in client if there is no equivalent session already stored.

Own Id: OTP-11365

The PEM cache is now validated by a background process, instead of always keeping it if it is small enough and clearing it otherwise. That strategy required that small caches where cleared by API function if a file changes on disk.

However export the API function to clear the cache as it may still be useful.

Own Id: OTP-12391

Add padding check for TLS-1.0 to remove Poodle vulnerability from TLS 1.0, also add the option padding_check. This option only affects TLS-1.0 connections and if set to false it disables the block cipher padding check to be able to interoperate with legacy software.

*** POTENTIAL INCOMPATIBILITY ***

Own Id: OTP-12420

Add support for TLS_FALLBACK_SCSV used to prevent undesired TLS version downgrades. If used by a client that is vulnerable to the POODLE attack, and the server also supports TLS_FALLBACK_SCSV, the attack can be prevented.

Own Id: OTP-12458

## SSL 5.3.8

### Fixed Bugs and Malfunctions

Make sure the clean rule for ssh, ssl, eunit and otp_mibs actually removes generated files.

Own Id: OTP-12200

### Improvements and New Features

Change code to reflect that state data may be secret to avoid breaking dialyzer contracts.

Own Id: OTP-12341

## SSL 5.3.7

### Fixed Bugs and Malfunctions

Handle the fact that servers may send an empty SNI extension to the client.

Own Id: OTP-12198

## SSL 5.3.6

### Fixed Bugs and Malfunctions

Corrected handling of ECC certificates, there where several small issues with the handling of such certificates in the ssl and public_key application. Now ECC signed ECC certificates shall work and not only RSA signed ECC certificates.

Own Id: OTP-12026

Check that the certificate chain ends with a trusted ROOT CA e.i. a self-signed certificate, but provide an option partial_chain to enable the application to define an intermediat CA as trusted.

Own Id: OTP-12149

### Improvements and New Features

Add decode functions for SNI (Server Name Indication)

Own Id: OTP-12048

## SSL 5.3.5

### Fixed Bugs and Malfunctions

ssl:recv now returns {error, einval} if applied to a non passive socket, the same as gen_tcp:recv.

Thanks to Danil Zagoskin for reporting this issue

Own Id: OTP-11878

Corrected handling of default values for signature_algorithms extension in TLS-1.2 and corresponding values used in previous versions that does not support this extension.

Thanks to Danil Zagoskin

Own Id: OTP-11886

Handle socket option inheritance when pooling of accept sockets is used

Own Id: OTP-11897

Make sure that the list of versions, possibly supplied in the versions option, is not order dependent.

Thanks to Ransom Richardson for reporting this issue

Own Id: OTP-11912

Reject connection if the next_protocol message is sent twice.

Own Id: OTP-11926

Correct options handling when ssl:ssl_accept/3 is called with new ssl options after calling ssl:listen/2

Own Id: OTP-11950

### Improvements and New Features

Gracefully handle unknown alerts

Thanks to Atul Atri for reporting this issue

Own Id: OTP-11874

Gracefully ignore cipher suites sent by client not supported by the SSL/TLS version that the client has negotiated.

Thanks to Danil Zagoskin for reporting this issue

Own Id: OTP-11875

Gracefully handle structured garbage, i.e a client sends some garbage in a ssl record instead of a valid fragment.

Thanks to Danil Zagoskin

Own Id: OTP-11880

Gracefully handle invalid alerts

Own Id: OTP-11890

Generalize handling of default ciphers

Thanks to Andreas Schultz

Own Id: OTP-11966

Make sure change cipher spec is correctly handled

Own Id: OTP-11975

## SSL 5.3.4

### Fixed Bugs and Malfunctions

Fix incorrect dialyzer spec and types, also enhance documentation.

Thanks to Ayaz Tuncer.

Own Id: OTP-11627

Fix possible mismatch between SSL/TLS version and default ciphers. Could happen when you specified SSL/TLS-version in optionlist to listen or accept.

Own Id: OTP-11712

Application upgrade (appup) files are corrected for the following applications:

asn1, common_test, compiler, crypto, debugger, dialyzer, edoc, eldap, erl_docgen, et, eunit, gs, hipe, inets, observer, odbc, os_mon, otp_mibs, parsetools, percept, public_key, reltool, runtime_tools, ssh, syntax_tools, test_server, tools, typer, webtool, wx, xmerl

A new test utility for testing appup files is added to test_server. This is now used by most applications in OTP.

(Thanks to Tobias Schlager)

Own Id: OTP-11744

### Improvements and New Features

Moved elliptic curve definition from the crypto NIF/OpenSSL into Erlang code, adds the RFC-5639 brainpool curves and makes TLS use them (RFC-7027).

Thanks to Andreas Schultz

Own Id: OTP-11578

Unicode adaptations

Own Id: OTP-11620

Added option honor_cipher_order. This instructs the server to prefer its own cipher ordering rather than the client's and can help protect against things like BEAST while maintaining compatability with clients which only support older ciphers.

Thanks to Andrew Thompson for the implementation, and Andreas Schultz for the test cases.

Own Id: OTP-11621

Replace boolean checking in validate_option with is_boolean guard.

Thanks to Andreas Schultz.

Own Id: OTP-11634

Some function specs are corrected or moved and some edoc comments are corrected in order to allow use of edoc. (Thanks to Pierre Fenoll)

Own Id: OTP-11702

Correct clean up of certificate database when certs are inputed in pure DER format.The incorrect code could cause a memory leek when certs where inputed in DER. Thanks to Bernard Duggan for reporting this.

Own Id: OTP-11733

Improved documentation of the cacertfile option

Own Id: OTP-11759 Aux Id: seq12535

Avoid next protocol negotiation failure due to incorrect option format.

Own Id: OTP-11760

Handle v1 CRLs, with no extensions and fixes issues with IDP (Issuing Distribution Point) comparison during CRL validation.

Thanks to Andrew Thompson

Own Id: OTP-11761

Server now ignores client ECC curves that it does not support instead of crashing.

Thanks to Danil Zagoskin for reporting the issue and suggesting a solution.

Own Id: OTP-11780

Handle SNI (Server Name Indication) alert unrecognized_name and gracefully deal with unexpected alerts.

Thanks to Masatake Daimon for reporting this.

Own Id: OTP-11815

Add possibility to specify ssl options when calling ssl:ssl_accept

Own Id: OTP-11837

## SSL 5.3.3

### Fixed Bugs and Malfunctions

Add missing validation of the server_name_indication option and test for its explicit use. It was not possible to set or disable the default server_name_indication as the validation of the option was missing.

Own Id: OTP-11567

Elliptic curve selection in server mode now properly selects a curve suggested by the client, if possible, and the fallback alternative is changed to a more widely supported curve.

Own Id: OTP-11575

Bug in the TLS hello extension handling caused the server to behave as it did not understand secure renegotiation.

Own Id: OTP-11595

## SSL 5.3.2

### Fixed Bugs and Malfunctions

Honors the clients advertised support of elliptic curves and no longer sends incorrect elliptic curve extension in server hello.

Own Id: OTP-11370

Fix initialization of DTLS fragment reassembler, in previously contributed code, for future support of DTLS . Thanks to Andreas Schultz.

Own Id: OTP-11376

Corrected type error in client_preferred_next_protocols documentation. Thanks to Julien Barbot.

Own Id: OTP-11457

### Improvements and New Features

TLS code has been refactored to prepare for future DTLS support. Also some DTLS code is in place but not yet runnable, some of it contributed by Andreas Schultz and some of it written by the OTP team. Thanks to to Andreas for his participation.

Own Id: OTP-11292

Remove extraneous dev debug code left in the close function. Thanks to Ken Key.

Own Id: OTP-11447

Add SSL Server Name Indication (SNI) client support. Thanks to Julien Barbot.

Own Id: OTP-11460

## SSL 5.3.1

### Fixed Bugs and Malfunctions

Setopts during renegotiation caused the renegotiation to be unsuccessful.

If calling setopts during a renegotiation the FSM state might change during the handling of the setopts messages, this is now handled correctly.

Own Id: OTP-11228

Now handles signature_algorithm field in digitally_signed properly with proper defaults. Prior to this change some elliptic curve cipher suites could fail reporting the error "bad certificate".

Own Id: OTP-11229

The code emulating the inet header option was changed in the belief that it made it inet compatible. However the testing is a bit hairy as the inet option is actually broken, now the tests are corrected and the header option should work in the same broken way as inet again, preferably use the bitsyntax instead.

Own Id: OTP-11230

### Improvements and New Features

Make the ssl manager name for erlang distribution over SSL/TLS relative to the module name of the ssl_manager.

This can be beneficial when making tools that rename modules for internal processing in the tool.

Own Id: OTP-11255

Add documentation regarding log_alert option.

Own Id: OTP-11271

## SSL 5.3

### Fixed Bugs and Malfunctions

Honor the versions option to ssl:connect and ssl:listen.

Own Id: OTP-10905

Next protocol negotiation with reused sessions will now succeed

Own Id: OTP-10909

### Improvements and New Features

Add support for PSK (Pre Shared Key) and SRP (Secure Remote Password) chipher suits, thanks to Andreas Schultz.

Own Id: OTP-10450 Aux Id: kunagi-269 [180]

Fix SSL Next Protocol Negotiation documentation. Thanks to Julien Barbot.

Own Id: OTP-10955

Fix ssl_connection to support reading proxy/chain certificates. Thanks to Valentin Kuznetsov.

Own Id: OTP-10980

Integrate elliptic curve contribution from Andreas Schultz

In order to be able to support elliptic curve cipher suites in SSL/TLS, additions to handle elliptic curve infrastructure has been added to public_key and crypto.

This also has resulted in a rewrite of the crypto API to gain consistency and remove unnecessary overhead. All OTP applications using crypto has been updated to use the new API.

Impact: Elliptic curve cryptography (ECC) offers equivalent security with smaller key sizes than other public key algorithms. Smaller key sizes result in savings for power, memory, bandwidth, and computational cost that make ECC especially attractive for constrained environments.

Own Id: OTP-11009

## SSL 5.2.1

### Improvements and New Features

Transport callback handling is changed so that gen_tcp is treated as a special case where inet will be called directly for functions such as setopts, as gen_tcp does not have its own setopts. This will enable users to use the transport callback for other customizations such as websockets.

Own Id: OTP-10847

Follow up to OTP-10451 solved in ssl-5.2 R16A. Make sure format_error return good strings. Replace confusing legacy atoms with more descriptive atoms.

Own Id: OTP-10864

## SSL 5.1.2.1

### Improvements and New Features

Make log_alert configurable as option in ssl, SSLLogLevel added as option to inets conf file

Own Id: OTP-11259

## SSL 5.2

### Fixed Bugs and Malfunctions

SSL: TLS 1.2, advertise sha224 support, thanks to Andreas Schultz.

Own Id: OTP-10586

If an ssl server is restarted with new options and a client tries to reuse a session the server must make sure that it complies to the new options before agreeing to reuse it.

Own Id: OTP-10595

Now handles cleaning of CA-certificate database correctly so that there will be no memory leek, bug was introduced in ssl- 5.1 when changing implementation to increase parallel execution.

Impact: Improved memory usage, especially if you have many different certificates and upgrade tcp-connections to TLS-connections.

Own Id: OTP-10710

### Improvements and New Features

Support Next Protocol Negotiation in TLS, thanks to Ben Murphy for the contribution.

Impact: Could give performance benefit if used as it saves a round trip.

Own Id: OTP-10361 Aux Id: kunagi-214 [125]

TLS 1.2 will now be the default TLS version if sufficient crypto support is available otherwise TLS 1.1 will be default.

Impact: A default TLS connection will have higher security and hence it may be perceived as slower then before.

Own Id: OTP-10425 Aux Id: kunagi-275 [186]

It is now possible to call controlling_process on a listen socket, same as in gen_tcp.

Own Id: OTP-10447

Remove filter mechanisms that made error messages backwards compatible with old ssl but hid information about what actually happened.

This does not break the documented API however other reason terms may be returned, so code that matches on the reason part of {error, Reason} may fail.

*** POTENTIAL INCOMPATIBILITY ***

Own Id: OTP-10451 Aux Id: kunagi-270 [181]

Added missing dependencies to Makefile

Own Id: OTP-10594

Removed deprecated function ssl:pid/0, it has been pointless since R14 but has been keep for backwards compatibility.

*** POTENTIAL INCOMPATIBILITY ***

Own Id: OTP-10613 Aux Id: kunagi-331 [242]

Refactor to simplify addition of key exchange methods, thanks to Andreas Schultz.

Own Id: OTP-10709

## SSL 5.1.2

### Fixed Bugs and Malfunctions

ssl:ssl_accept/2 timeout is no longer ignored

Own Id: OTP-10600

## SSL 5.1.1

### Fixed Bugs and Malfunctions

ssl:recv/3 could "loose" data when the timeout occurs. If the timout in ssl:connect or ssl:ssl_accept expired the ssl connection process was not terminated as it should, this due to gen_fsm:send_all_state_event timout is a client side time out. These timouts are now handled by the gen_fsm-procss instead.

Own Id: OTP-10569

### Improvements and New Features

Better termination handling that avoids hanging.

Own Id: OTP-10574

## SSL 5.1

### Fixed Bugs and Malfunctions

Sometimes the client process could receive an extra {error, closed} message after ssl:recv had returned {error, closed}.

Own Id: OTP-10118

ssl v3 alert number 41 (no_certificate_RESERVED) is now recognized

Own Id: OTP-10196

### Improvements and New Features

Experimental support for TLS 1.1 is now available, will be officially supported from OTP-R16. Thanks to Andreas Schultz for implementing the first version.

Own Id: OTP-8871

Experimental support for TLS 1.2 is now available, will be officially supported from OTP-R16. Thanks to Andreas Schultz for implementing the first version.

Own Id: OTP-8872

Removed some bottlenecks increasing the applications parallelism especially for the client side.

Own Id: OTP-10113

Workaround for handling certificates that wrongly encode X509countryname in utf-8 when the actual value is a valid ASCCI value of length 2. Such certificates are accepted by many browsers such as Chrome and Fierfox so for interoperability reasons we will too.

Own Id: OTP-10222

## SSL 5.0.1

### Fixed Bugs and Malfunctions

Robustness and improvement to distribution over SSL

Fix a bug where ssl_tls_dist_proxy would crash at caller timeout. Fix a bug where a timeout from the SSL layer would block the distribution indefinately. Run the proxy exclusively on the loopback interface. (Thanks to Paul Guyot)

Own Id: OTP-9915

Fix setup loop of SSL TLS dist proxy

Fix potential leak of processes waiting indefinately for data from closed sockets during socket setup phase. (Thanks to Paul Guyot)

Own Id: OTP-9916

Correct spelling of registered (Thanks to Richard Carlsson)

Own Id: OTP-9925

Added TLS PRF function to the SSL API for generation of additional key material from a TLS session. (Thanks to Andreas Schultz)

Own Id: OTP-10024

## SSL 5.0

### Fixed Bugs and Malfunctions

Invalidation handling of sessions could cause the time_stamp field in the session record to be set to undefined crashing the session clean up process. This did not affect the connections but would result in that the session table would grow.

Own Id: OTP-9696 Aux Id: seq11947

Changed code to use ets:foldl and throw instead of ets:next traversal, avoiding the need to explicitly call ets:safe_fixtable. It was possible to get a badarg-crash under special circumstances.

Own Id: OTP-9703 Aux Id: seq11947

Send ssl_closed notification to active ssl user when a tcp error occurs.

Own Id: OTP-9734 Aux Id: seq11946

If a passive receive was ongoing during a renegotiation the process evaluating ssl:recv could be left hanging for ever.

Own Id: OTP-9744

### Improvements and New Features

Support for the old ssl implementation is dropped and the code is removed.

Own Id: OTP-7048

The erlang distribution can now be run over the new ssl implementation. All options can currently not be set but it is enough to replace to old ssl implementation.

Own Id: OTP-7053

public_key, ssl and crypto now supports PKCS-8

Own Id: OTP-9312

Implements a CBC timing attack counter measure. Thanks to Andreas Schultz for providing the patch.

Own Id: OTP-9683

Mitigates an SSL/TLS Computational DoS attack by disallowing the client to renegotiate many times in a row in a short time interval, thanks to Tuncer Ayaz for alerting us about this.

Own Id: OTP-9739

Implements the 1/n-1 splitting countermeasure to the Rizzo Duong BEAST attack, affects SSL 3.0 and TLS 1.0. Thanks to Tuncer Ayaz for alerting us about this.

Own Id: OTP-9750

## SSL 4.1.6

### Fixed Bugs and Malfunctions

replace "a ssl" with "an ssl" reindent pkix_path_validation/3 Trivial documentation fixes (Thanks to Christian von Roques )

Own Id: OTP-9464

### Improvements and New Features

Adds function clause to avoid denial of service attack. Thanks to Vinod for reporting this vulnerability.

Own Id: OTP-9364

Error handling code now takes care of inet:getopts/2 and inets:setopts/2 crashes. Thanks to Richard Jones for reporting this.

Own Id: OTP-9382

Support explicit use of packet option httph and httph_bin

Own Id: OTP-9461

Decoding of hello extensions could fail to come to the correct conclusion due to an error in a binary match pattern. Thanks to Ben Murphy.

Own Id: OTP-9589

## SSL 4.1.5

### Improvements and New Features

Calling gen_tcp:connect with option {ip, {127,0,0,1}} results in an exit with reason badarg. Neither SSL nor INETS This was not catched, resulting in crashes with incomprehensible reasons.

Own Id: OTP-9289 Aux Id: seq11845

## SSL 4.1.3

### Fixed Bugs and Malfunctions

Fixed error in cache-handling fix from ssl-4.1.2

Own Id: OTP-9018 Aux Id: seq11739

Verification of a critical extended_key_usage-extension corrected

Own Id: OTP-9029 Aux Id: seq11541

## SSL 4.1.2

### Fixed Bugs and Malfunctions

The ssl application caches certificate files, it will now invalidate cache entries if the diskfile is changed.

Own Id: OTP-8965 Aux Id: seq11739

Now runs the terminate function before returning from the call made by ssl:close/1, as before the caller of ssl:close/1 could get problems with the reuseaddr option.

Own Id: OTP-8992

## SSL 4.1.1

### Fixed Bugs and Malfunctions

Correct handling of client certificate verify message When checking the client certificate verify message the server used the wrong algorithm identifier to determine the signing algorithm, causing a function clause error in the public_key application when the key-exchange algorithm and the public key algorithm of the client certificate happen to differ.

Own Id: OTP-8897

### Improvements and New Features

For testing purposes ssl now also support some anonymous cipher suites when explicitly configured to do so.

Own Id: OTP-8870

Sends an error alert instead of crashing if a crypto function for the selected cipher suite fails.

Own Id: OTP-8930 Aux Id: seq11720

## SSL 4.1

### Improvements and New Features

Updated ssl to ignore CA certs that violate the asn1-spec for a certificate, and updated public key asn1 spec to handle inherited DSS-params.

Own Id: OTP-7884

Changed ssl implementation to retain backwards compatibility for old option {verify, 0} that shall be equivalent to {verify, verify_none}, also separate the cases unknown ca and selfsigned peer cert, and restored return value of deprecated function public_key:pem_to_der/1.

Own Id: OTP-8858

Changed the verify fun so that it differentiate between the peer certificate and CA certificates by using valid_peer or valid as the second argument to the verify fun. It may not always be trivial or even possible to know when the peer certificate is reached otherwise.

*** POTENTIAL INCOMPATIBILITY ***

Own Id: OTP-8873

## SSL 4.0.1

### Fixed Bugs and Malfunctions

The server now verifies the client certificate verify message correctly, instead of causing a case-clause.

Own Id: OTP-8721

The client hello message now always include ALL available cipher suites (or those specified by the ciphers option). Previous implementation would filter them based on the client certificate key usage extension (such filtering only makes sense for the server certificate).

Own Id: OTP-8772

Fixed handling of the option {mode, list} that was broken for some packet types for instance line.

Own Id: OTP-8785

Empty packets were not delivered to the client.

Own Id: OTP-8790

Building in a source tree without prebuilt platform independent build results failed on the SSL examples when:

cross building. This has been solved by not building the SSL examples during a cross build. building on Windows.

Own Id: OTP-8791

Fixed a handshake error which occurred on some ssl implementations.

Own Id: OTP-8793

### Improvements and New Features

Revise the public_key API - Cleaned up and documented the public_key API to make it useful for general use, also changed ssl to use the new API.

Own Id: OTP-8722

Added support for inputing certificates and keys directly in DER format these options will override the pem-file options if specified.

Own Id: OTP-8723

To gain interoperability ssl will not check for padding errors when using TLS 1.0. It is first in TLS 1.1 that checking the padding is an requirement.

Own Id: OTP-8740

Changed the semantics of the verify_fun option in the ssl-application so that it takes care of both application handling of path validation errors and verification of application specific extensions. This means that it is now possible for the server application in verify_peer mode to handle path validation errors. This change moved some functionality earlier in ssl to the public_key application.

Own Id: OTP-8770

Added the functionality so that the verification fun will be called when a certificate is considered valid by the path validation to allow access to each certificate in the path to the user application. Also try to verify subject-AltName, if unable to verify it let the application verify it.

Own Id: OTP-8825

## SSL 4.0

### Improvements and New Features

New ssl now support client/server-certificates signed by dsa keys.

Own Id: OTP-8587

Ssl has now switched default implementation and removed deprecated certificate handling. All certificate handling is done by the public_key application.

Own Id: OTP-8695