SSL Release Notes

SSL 9.3

Fixed Bugs and Malfunctions

The distribution handshake with TLS distribution (inet_tls_dist) does now utilize the socket option {nodelay, true}, which decreases the distribution setup time significantly.

Own Id: OTP-14792

Correct shutdown reason to avoid an incorrect crash report

Own Id: OTP-15710 Aux Id: ERL-893

Enhance documentation and type specifications.

Own Id: OTP-15746 Aux Id: ERIERL-333

Improvements and New Features

TLS-1.0, TLS-1.1 and DTLS-1.0 are now considered legacy and not supported by default

*** POTENTIAL INCOMPATIBILITY ***

Own Id: OTP-14865

Use new logger API in ssl. Introduce log levels and verbose debug logging for SSL.

Own Id: OTP-15055

Add new API function str_to_suite/1, cipher_suites/3 (list cipher suites as rfc or OpenSSL name strings) and suite_to_openssl_str/1

Own Id: OTP-15483 Aux Id: ERL-924

Basic support for TLS 1.3 Server for experimental use. The client is not yet functional, for more information see the Standards Compliance chapter of the User's Guide.

Own Id: OTP-15591

Add support for PSK CCM ciphers from RFC 6655

Own Id: OTP-15626

SSL 9.2

Fixed Bugs and Malfunctions

Fix bug that an incorrect return value for gen_statem could be created when alert was a result of handling renegotiation info extension

Own Id: OTP-15502

Correct check for 3des_ede_cbc, could cause ssl to claim to support 3des_ede_cbc when cryptolib does not.

Own Id: OTP-15539

Improved DTLS error handling, avoids unexpected connection failure in rare cases.

Own Id: OTP-15561

Corrected active once emulation bug that could cause the ssl_closed meassage to not be sent. Bug introduced by OTP-15449

Own Id: OTP-15666 Aux Id: ERIERL-316,

Improvements and New Features

Add client option {reuse_session, SessionID::binary()} that can be used together with new option value {reuse_sessions, save}. This makes it possible to reuse a session from a specific connection establishment.

Own Id: OTP-15369

The Reason part of of the error return from the functions connect and handshake has a better and documented format. This will sometimes differ from previous returned reasons, however those where only documented as term() and should for that reason not be relied on.

*** POTENTIAL INCOMPATIBILITY ***

Own Id: OTP-15423

Refactor of state handling to improve TLS application data throughput and reduce CPU overhead

Own Id: OTP-15445

The SSL code has been optimized in many small ways to reduce CPU load for encryption/decryption, especially for Erlang's distribution protocol over TLS.

Own Id: OTP-15529

Add support for active N

Own Id: OTP-15665 Aux Id: ERL-811, PR-2072

SSL 9.1

Fixed Bugs and Malfunctions

PEM cache was not evicting expired entries due to due to timezone confusion.

Own Id: OTP-15368

Make sure an error is returned if a "transport_accept socket" is used in some other call than ssl:handshake* or ssl:controlling_process

Own Id: OTP-15384 Aux Id: ERL-756

Fix timestamp handling in the PEM-cache could cause entries to not be invalidated at the correct time.

Own Id: OTP-15402

Extend check for undelivered data at closing, could under some circumstances fail to deliver all data that was actually received.

Own Id: OTP-15412 Aux Id: ERL-731

Correct signature check for TLS-1.2 that allows different algorithms for signature of peer cert and peer cert key. Not all allowed combinations where accepted.

Own Id: OTP-15415 Aux Id: ERL-763

Correct gen_statem return value, could cause renegotiation to fail.

Own Id: OTP-15418 Aux Id: ERL-770

Improvements and New Features

Add engine support for RSA key exchange

Own Id: OTP-15420 Aux Id: ERIERL-268

ssl now uses active n internally to boost performance. Old active once behavior can be restored by setting application variable see manual page for ssl application (man 6).

*** POTENTIAL INCOMPATIBILITY ***

Own Id: OTP-15449

SSL 9.0.2

Fixed Bugs and Malfunctions

Use separate processes for sending and receiving application data for TLS connections to avoid potential deadlock that was most likely to occur when using TLS for Erlang distribution. Note does not change the API.

Own Id: OTP-15122

Correct handling of empty server SNI extension

Own Id: OTP-15168

Correct PSK cipher suite handling and add selected_cipher_suite to connection information

Own Id: OTP-15172

Adopt to the fact that cipher suite sign restriction are relaxed in TLS-1.2

Own Id: OTP-15173

Enhance error handling of non existing PEM files

Own Id: OTP-15174

Correct close handling of transport accepted sockets in the error state

Own Id: OTP-15216

Correct PEM cache to not add references to empty entries when PEM file does not exist.

Own Id: OTP-15224

Correct handling of all PSK cipher suites

Before only some PSK suites would be correctly negotiated and most PSK ciphers suites would fail the connection.

Own Id: OTP-15285

Improvements and New Features

TLS will now try to order certificate chains if they appear to be unordered. That is prior to TLS 1.3, “certificate_list” ordering was required to be strict, however some implementations already allowed for some flexibility. For maximum compatibility, all implementations SHOULD be prepared to handle potentially extraneous certificates and arbitrary orderings from any TLS version.

Own Id: OTP-12983

TLS will now try to reconstructed an incomplete certificate chains from its local CA-database and use that data for the certificate path validation. This especially makes sense for partial chains as then the peer might not send an intermediate CA as it is considered the trusted root in that case.

Own Id: OTP-15060

Option keyfile defaults to certfile and should be trumped with key. This failed for engine keys.

Own Id: OTP-15193

Error message improvement when own certificate has decoding issues, see also issue ERL-668.

Own Id: OTP-15234

Correct dialyzer spec for key option

Own Id: OTP-15281

SSL 9.0

Fixed Bugs and Malfunctions

Correct handling of ECDH suites.

Own Id: OTP-14974

Proper handling of clients that choose to send an empty answer to a certificate request

Own Id: OTP-15050

Improvements and New Features

Distribution over SSL (inet_tls) has, to improve performance, been rewritten to not use intermediate processes and ports.

Own Id: OTP-14465

Add suport for ECDHE_PSK cipher suites

Own Id: OTP-14547

For security reasons no longer support 3-DES cipher suites by default

*** INCOMPATIBILITY with possibly ***

Own Id: OTP-14768

For security reasons RSA-key exchange cipher suites are no longer supported by default

*** INCOMPATIBILITY with possible ***

Own Id: OTP-14769

The interoperability option to fallback to insecure renegotiation now has to be explicitly turned on.

*** INCOMPATIBILITY with possibly ***

Own Id: OTP-14789

Drop support for SSLv2 enabled clients. SSLv2 has been broken for decades and never supported by the Erlang SSL/TLS implementation. This option was by default disabled and enabling it has proved to sometimes break connections not using SSLv2 enabled clients.

*** POTENTIAL INCOMPATIBILITY ***

Own Id: OTP-14824

Remove CHACHA20_POLY1305 ciphers form default for now. We have discovered interoperability problems, ERL-538, that we believe needs to be solved in crypto.

*** INCOMPATIBILITY with possibly ***

Own Id: OTP-14882

Generalize DTLS packet multiplexing to make it easier to add future DTLS features and uses.

Own Id: OTP-14888

Use uri_string module instead of http_uri.

Own Id: OTP-14902

The SSL distribution protocol -proto inet_tls has stopped setting the SSL option server_name_indication. New verify funs for client and server in inet_tls_dist has been added, not documented yet, that checks node name if present in peer certificate. Usage is still also yet to be documented.

Own Id: OTP-14969 Aux Id: OTP-14465, ERL-598

Deprecate ssl:ssl_accept/[1,2,3] in favour of ssl:handshake/[1,2,3]

Own Id: OTP-15056

Customizes the hostname verification of the peer certificate, as different protocols that use TLS such as HTTP or LDAP may want to do it differently

Own Id: OTP-15102 Aux Id: ERL-542, OTP-14962

Add utility function for converting erlang cipher suites to a string represenation (ERL-600).

Own Id: OTP-15106

First version with support for DTLS

Own Id: OTP-15142

SSL 8.2.4

Fixed Bugs and Malfunctions

Optimization of bad merge conflict resolution causing dubble decode

Own Id: OTP-14843

Restore error propagation to OTP-19.3 behaviour, in OTP-20.2 implementation adjustments to gen_statem needed some further adjustments to avoid a race condition. This could cause a TLS server to not always report file path errors correctly.

Own Id: OTP-14852

Corrected RC4 suites listing function to regard TLS version

Own Id: OTP-14871

Fix alert handling so that unexpected messages are logged and alerted correctly

Own Id: OTP-14919

Correct handling of anonymous cipher suites

Own Id: OTP-14952

Improvements and New Features

Added new API functions to facilitate cipher suite handling

Own Id: OTP-14760

Correct TLS_FALLBACK_SCSV handling so that this special flag suite is always placed last in the cipher suite list in accordance with the specs. Also make sure this functionality is used in DTLS.

Own Id: OTP-14828

Add TLS record version sanity check for early as possible error detection and consistency in ALERT codes generated

Own Id: OTP-14892

SSL 8.2.3

Fixed Bugs and Malfunctions

Packet options cannot be supported for unreliable transports, that is, packet option for DTLS over udp will not be supported.

Own Id: OTP-14664

Ensure data delivery before close if possible. This fix is related to fix in PR-1479.

Own Id: OTP-14794

Improvements and New Features

The crypto API is extended to use private/public keys stored in an Engine for sign/verify or encrypt/decrypt operations.

The ssl application provides an API to use this new engine concept in TLS.

Own Id: OTP-14448

Implemented renegotiation for DTLS

Own Id: OTP-14563

A new command line option -ssl_dist_optfile has been added to facilitate specifying the many options needed when using SSL as the distribution protocol.

Own Id: OTP-14657

SSL 8.2.2

Fixed Bugs and Malfunctions

TLS sessions must be registered with SNI if provided, so that sessions where client hostname verification would fail cannot connect reusing a session created when the server name verification succeeded.

Own Id: OTP-14632

An erlang TLS server configured with cipher suites using rsa key exchange, may be vulnerable to an Adaptive Chosen Ciphertext attack (AKA Bleichenbacher attack) against RSA, which when exploited, may result in plaintext recovery of encrypted messages and/or a Man-in-the-middle (MiTM) attack, despite the attacker not having gained access to the server’s private key itself. CVE-2017-1000385

Exploiting this vulnerability to perform plaintext recovery of encrypted messages will, in most practical cases, allow an attacker to read the plaintext only after the session has completed. Only TLS sessions established using RSA key exchange are vulnerable to this attack.

Exploiting this vulnerability to conduct a MiTM attack requires the attacker to complete the initial attack, which may require thousands of server requests, during the handshake phase of the targeted session within the window of the configured handshake timeout. This attack may be conducted against any TLS session using RSA signatures, but only if cipher suites using RSA key exchange are also enabled on the server. The limited window of opportunity, limitations in bandwidth, and latency make this attack significantly more difficult to execute.

RSA key exchange is enabled by default although least prioritized if server order is honored. For such a cipher suite to be chosen it must also be supported by the client and probably the only shared cipher suite.

Captured TLS sessions encrypted with ephemeral cipher suites (DHE or ECDHE) are not at risk for subsequent decryption due to this vulnerability.

As a workaround if default cipher suite configuration was used you can configure the server to not use vulnerable suites with the ciphers option like this:

{ciphers, [Suite || Suite <- ssl:cipher_suites(), element(1,Suite) =/= rsa]}

that is your code will look somethingh like this:

ssl:listen(Port, [{ciphers, [Suite || Suite <- ssl:cipher_suites(), element(1,S) =/= rsa]} | Options]).

Thanks to Hanno Böck, Juraj Somorovsky and Craig Young for reporting this vulnerability.

Own Id: OTP-14748

Improvements and New Features

If no SNI is available and the hostname is an IP-address also check for IP-address match. This check is not as good as a DNS hostname check and certificates using IP-address are not recommended.

Own Id: OTP-14655

SSL 8.2

Fixed Bugs and Malfunctions

ECDH-ECDSA key exchange supported, was accidently dismissed in earlier versions.

Own Id: OTP-14421

Correct close semantics for active once connections. This was a timing dependent bug the resulted in the close message not always reaching the ssl user process.

Own Id: OTP-14443

Improvements and New Features

TLS-1.2 clients will now always send hello messages on its own format, as opposed to earlier versions that will send the hello on the lowest supported version, this is a change supported by the latest RFC.

This will make interoperability with some newer servers smoother. Potentially, but unlikely, this could cause a problem with older servers if they do not adhere to the RFC and ignore unknown extensions.

*** POTENTIAL INCOMPATIBILITY ***

Own Id: OTP-13820

Allow Erlang/OTP to use OpenSSL in FIPS-140 mode, in order to satisfy specific security requirements (mostly by different parts of the US federal government).

See the new crypto users guide "FIPS mode" chapter about building and using the FIPS support which is disabled by default.

(Thanks to dszoboszlay and legoscia)

Own Id: OTP-13921 Aux Id: PR-1180

Implemented DTLS cookie generation, required by spec, instead of using a hardcoded value.

Own Id: OTP-14076

Implement sliding window replay protection of DTLS records.

Own Id: OTP-14077

TLS client processes will by default call public_key:pkix_verify_hostname/2 to verify the hostname of the connection with the server certificates specified hostname during certificate path validation. The user may explicitly disables it. Also if the hostname cannot be derived from the first argument to connect or is not supplied by the server name indication option, the check will not be performed.

Own Id: OTP-14197

Extend connection_information/[1,2] . The values session_id, master_secret, client_random and server_random can no be accessed by connection_information/2. Note only session_id will be added to connection_information/1. The rational is that values concerning the connection security should have to be explicitly requested.

Own Id: OTP-14291

Chacha cipher suites are currently not tested enough to be most preferred ones

Own Id: OTP-14382

Basic support for DTLS that been tested together with OpenSSL.

Test by providing the option {protocol, dtls} to the ssl API functions connect and listen.

Own Id: OTP-14388

SSL 8.1.3.1

Fixed Bugs and Malfunctions

Captured TLS sessions encrypted with ephemeral cipher suites (DHE or ECDHE) are not at risk for subsequent decryption due to this vulnerability.

As a workaround if default cipher suite configuration was used you can configure the server to not use vulnerable suites with the ciphers option like this:

{ciphers, [Suite || Suite <- ssl:cipher_suites(), element(1,Suite) =/= rsa]}

that is your code will look somethingh like this:

ssl:listen(Port, [{ciphers, [Suite || Suite <- ssl:cipher_suites(), element(1,S) =/= rsa]} | Options]).

Thanks to Hanno Böck, Juraj Somorovsky and Craig Young for reporting this vulnerability.

Own Id: OTP-14748

SSL 8.1.1

Fixed Bugs and Malfunctions

Corrected termination behavior, that caused a PEM cache bug and sometimes resulted in connection failures.

Own Id: OTP-14100

Fix bug that could hang ssl connection processes when failing to require more data for very large handshake packages. Add option max_handshake_size to mitigate DoS attacks.

Own Id: OTP-14138

Improved support for CRL handling that could fail to work as intended when an id-ce-extKeyUsage was present in the certificate. Also improvements where needed to distributionpoint handling so that all revocations actually are found and not deemed to be not determinable.

Own Id: OTP-14141

A TLS handshake might accidentally match old sslv2 format and ssl application would incorrectly aborted TLS handshake with ssl_v2_client_hello_no_supported. Parsing was altered to avoid this problem.

Own Id: OTP-14222

Correct default cipher list to prefer AES 128 before 3DES

Own Id: OTP-14235

Improvements and New Features

Move PEM cache to a dedicated process, to avoid making the SSL manager process a bottleneck. This improves scalability of TLS connections.

Own Id: OTP-13874

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

Correct handling of signature algorithm selection

Own Id: OTP-13711

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

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 7.3.3.2

Fixed Bugs and Malfunctions

Captured TLS sessions encrypted with ephemeral cipher suites (DHE or ECDHE) are not at risk for subsequent decryption due to this vulnerability.

As a workaround if default cipher suite configuration was used you can configure the server to not use vulnerable suites with the ciphers option like this:

{ciphers, [Suite || Suite <- ssl:cipher_suites(), element(1,Suite) =/= rsa]}

that is your code will look somethingh like this:

ssl:listen(Port, [{ciphers, [Suite || Suite <- ssl:cipher_suites(), element(1,S) =/= rsa]} | Options]).

Thanks to Hanno Böck, Juraj Somorovsky and Craig Young for reporting this vulnerability.

Own Id: OTP-14748

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

SSL 7.3.3.0.1

Fixed Bugs and Malfunctions

Captured TLS sessions encrypted with ephemeral cipher suites (DHE or ECDHE) are not at risk for subsequent decryption due to this vulnerability.

As a workaround if default cipher suite configuration was used you can configure the server to not use vulnerable suites with the ciphers option like this:

{ciphers, [Suite || Suite <- ssl:cipher_suites(), element(1,Suite) =/= rsa]}

that is your code will look somethingh like this:

ssl:listen(Port, [{ciphers, [Suite || Suite <- ssl:cipher_suites(), element(1,S) =/= rsa]} | Options]).

Thanks to Hanno Böck, Juraj Somorovsky and Craig Young for reporting this vulnerability.

Own Id: OTP-14748

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

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

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 5.3.5

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 5.3.2

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

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

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 4.1.1

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