diff options
Diffstat (limited to 'lib/ssl/doc')
| -rw-r--r-- | lib/ssl/doc/src/notes.xml | 151 | ||||
| -rw-r--r-- | lib/ssl/doc/src/ssl.xml | 8 | ||||
| -rw-r--r-- | lib/ssl/doc/src/ssl_session_cache_api.xml | 31 |
3 files changed, 182 insertions, 8 deletions
diff --git a/lib/ssl/doc/src/notes.xml b/lib/ssl/doc/src/notes.xml index 29b8e8ff67..d37a180f54 100644 --- a/lib/ssl/doc/src/notes.xml +++ b/lib/ssl/doc/src/notes.xml @@ -28,6 +28,157 @@ <p>This document describes the changes made to the SSL application.</p> +<section><title>SSL 8.1.3.1</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> 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. <url + href="https://nvd.nist.gov/vuln/detail/CVE-2017-1000385">CVE-2017-1000385</url> + </p> <p> 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. </p> <p> 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. </p> <p> 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. </p> <p> Captured TLS sessions + encrypted with ephemeral cipher suites (DHE or ECDHE) are + not at risk for subsequent decryption due to this + vulnerability. </p> <p> 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: </p> <c> {ciphers, [Suite || Suite <- + ssl:cipher_suites(), element(1,Suite) =/= rsa]} </c> <p> + that is your code will look somethingh like this: </p> + <c> ssl:listen(Port, [{ciphers, [Suite || Suite <- + ssl:cipher_suites(), element(1,S) =/= rsa]} | Options]). + </c> <p> Thanks to Hanno Böck, Juraj Somorovsky and + Craig Young for reporting this vulnerability. </p> + <p> + Own Id: OTP-14748</p> + </item> + </list> + </section> + +</section> + +<section><title>SSL 8.1.3</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Remove debug printout</p> + <p> + Own Id: OTP-14396</p> + </item> + </list> + </section> + +</section> + +<section><title>SSL 8.1.2</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Correct active once emulation, for TLS. Now all data + received by the connection process will be delivered + through active once, even when the active once arrives + after that the gen_tcp socket is closed by the peer.</p> + <p> + Own Id: OTP-14300</p> + </item> + </list> + </section> + +</section> + +<section><title>SSL 8.1.1</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Corrected termination behavior, that caused a PEM cache + bug and sometimes resulted in connection failures.</p> + <p> + Own Id: OTP-14100</p> + </item> + <item> + <p> + 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.</p> + <p> + Own Id: OTP-14138</p> + </item> + <item> + <p> + 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.</p> + <p> + Own Id: OTP-14141</p> + </item> + <item> + <p> + 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.</p> + <p> + Own Id: OTP-14222</p> + </item> + <item> + <p> + Correct default cipher list to prefer AES 128 before 3DES</p> + <p> + Own Id: OTP-14235</p> + </item> + </list> + </section> + + + <section><title>Improvements and New Features</title> + <list> + <item> + <p> + Move PEM cache to a dedicated process, to avoid making + the SSL manager process a bottleneck. This improves + scalability of TLS connections.</p> + <p> + Own Id: OTP-13874</p> + </item> + </list> + </section> + +</section> + <section><title>SSL 8.1</title> <section><title>Fixed Bugs and Malfunctions</title> diff --git a/lib/ssl/doc/src/ssl.xml b/lib/ssl/doc/src/ssl.xml index edc7e0d8b2..916b41742e 100644 --- a/lib/ssl/doc/src/ssl.xml +++ b/lib/ssl/doc/src/ssl.xml @@ -424,6 +424,14 @@ marker="public_key:public_key#pkix_path_validation-3">public_key:pkix_path_valid </taglist> </item> + + <tag><c>max_handshake_size</c></tag> + <item> + <p>Integer (24 bits unsigned). Used to limit the size of + valid TLS handshake packets to avoid DoS attacks. + Defaults to 256*1024.</p> + </item> + </taglist> </item> diff --git a/lib/ssl/doc/src/ssl_session_cache_api.xml b/lib/ssl/doc/src/ssl_session_cache_api.xml index b85d8fb284..a84a3dfce9 100644 --- a/lib/ssl/doc/src/ssl_session_cache_api.xml +++ b/lib/ssl/doc/src/ssl_session_cache_api.xml @@ -4,14 +4,14 @@ <erlref> <header> <copyright> - <year>1999</year><year>2015</year> + <year>1999</year><year>2017</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at - + http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software @@ -62,8 +62,8 @@ </taglist> </section> - - <funcs> + + <funcs> <func> <name>delete(Cache, Key) -> _</name> @@ -134,7 +134,7 @@ </p> </desc> </func> - + <func> <name>select_session(Cache, PartialKey) -> [session()]</name> <fsummary>Selects sessions that can be reused.</fsummary> @@ -151,6 +151,21 @@ </func> <func> + <name>size(Cache) -> integer()</name> + <fsummary>Returns the number of sessions in the cache.</fsummary> + <type> + <v>Cache = cache_ref()</v> + </type> + <desc> + <p>Returns the number of sessions in the cache. If size + exceeds the maximum number of sessions, the current cache + entries will be invalidated regardless of their remaining + lifetime. Is to be callable from any process. + </p> + </desc> + </func> + + <func> <name>terminate(Cache) -> _</name> <fsummary>Called by the process that handles the cache when it is about to terminate.</fsummary> @@ -178,7 +193,7 @@ </p> </desc> </func> - - </funcs> - + + </funcs> + </erlref> |