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OpenSSL::SSL::SSLContext#ciphers= "DEFAULT:!aNULL" fails #2193

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jordansissel opened this issue Nov 13, 2014 · 3 comments · Fixed by jruby/jruby-openssl#136
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OpenSSL::SSL::SSLContext#ciphers= "DEFAULT:!aNULL" fails #2193

jordansissel opened this issue Nov 13, 2014 · 3 comments · Fixed by jruby/jruby-openssl#136
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openssl
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Non-Release

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@jordansissel
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In trying to disable aNULL ciphers, I get an exception -

The code example below is a minimal reproduction of this problem.

% ruby -ropenssl -e 'ctx = OpenSSL::SSL::SSLContext.new; ctx.ciphers = "DEFAULT:!aNULL"'
OpenSSL::SSL::SSLError: no cipher match
  ciphers= at org/jruby/ext/openssl/SSLContext.java:391
    (root) at -e:1

The following examples do not raise exceptions:

  • ctx.ciphers = "DEFAULT"
  • ctx.ciphers = "aNULL"
  • ctx.ciphers = "ALL:!aNULL"

Interestingly, if I look at the ciphers for DEFAULT and for aNULL specifically, I see no overlap:

[12] pry(main)> default.sort
=> [["AES128-SHA", "TLSv1/SSLv3", 128, 128],
 ["AES256-SHA", "TLSv1/SSLv3", 256, 256],
 ["DES-CBC-SHA", "TLSv1/SSLv3", 56, 56],
 ["DES-CBC3-SHA", "TLSv1/SSLv3", 168, 168],
 ["DHE-DSS-AES128-SHA", "TLSv1/SSLv3", 128, 128],
 ["DHE-DSS-AES256-SHA", "TLSv1/SSLv3", 256, 256],
 ["DHE-RSA-AES128-SHA", "TLSv1/SSLv3", 128, 128],
 ["DHE-RSA-AES256-SHA", "TLSv1/SSLv3", 256, 256],
 ["EDH-DSS-DES-CBC3-SHA", "TLSv1/SSLv3", 168, 168],
 ["EDH-RSA-DES-CBC-SHA", "TLSv1/SSLv3", 56, 56],
 ["EDH-RSA-DES-CBC3-SHA", "TLSv1/SSLv3", 168, 168],
 ["EXP-DES-CBC-SHA", "TLSv1/SSLv3", 40, 56],
 ["EXP-EDH-DSS-DES-CBC-SHA", "TLSv1/SSLv3", 40, 56],
 ["EXP-EDH-RSA-DES-CBC-SHA", "TLSv1/SSLv3", 40, 56],
 ["EXP-RC4-MD5", "TLSv1/SSLv3", 40, 128],
 ["RC4-MD5", "TLSv1/SSLv3", 128, 128],
 ["RC4-SHA", "TLSv1/SSLv3", 128, 128]]
[13] pry(main)> null.sort
=> [["ADH-AES128-SHA", "TLSv1/SSLv3", 128, 128],
 ["ADH-AES256-SHA", "TLSv1/SSLv3", 256, 256],
 ["ADH-DES-CBC-SHA", "TLSv1/SSLv3", 56, 56],
 ["ADH-DES-CBC3-SHA", "TLSv1/SSLv3", 168, 168],
 ["ADH-RC4-MD5", "TLSv1/SSLv3", 128, 128],
 ["EXP-ADH-DES-CBC-SHA", "TLSv1/SSLv3", 40, 128],
 ["EXP-ADH-RC4-MD5", "TLSv1/SSLv3", 40, 128]]

All the aNULL ciphers use anonymous diffie-helman. None of the DEFAULT ones do.

As a workaround, I think I can generate my own list of ciphers using this kind of hack:


def ciphers(string)
  ctx = OpenSSL::SSL::SSLContext.new
  ctx.ciphers = string
  ctx.ciphers
end

Then doing something like:

ctx.ciphers = ciphers("DEFAULT") - ciphers("aNULL") - ciphers("eNULL") ...
@jordansissel
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Environment details:

jruby 1.7.16 (1.9.3p392) 2014-09-25 575b395 on OpenJDK 64-Bit Server VM 1.7.0_65-b32 +jit [linux-amd64]
java version "1.7.0_65"
OpenJDK Runtime Environment (IcedTea 2.5.2) (7u65-2.5.2-3~14.04)
OpenJDK 64-Bit Server VM (build 24.65-b04, mixed mode)

@jordansissel
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Present in JRuby 1.7.17. I'm hoping to tackle this in the next few weeks, but no promises :)

@MSNexploder MSNexploder mentioned this issue Jun 11, 2017
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kares pushed a commit to jruby/jruby-openssl that referenced this issue Jun 12, 2017
@MSNexploder @kares
move "DEFAULT" handling right into CipherStrings (#136)
0045ab7 
move "DEFAULT" special case handling further down and match OpenSSL behaviour
fixes jruby/jruby#2193
@kares kares added the openssl label Jun 12, 2017
@kares
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kares commented Jun 12, 2017

a fix from @MSNexploder is expected to be part of jruby-openssl >= 0.9.21

@kares kares added this to the Non-Release milestone Jun 12, 2017
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move "DEFAULT" handling right into CipherStrings MSNexploder/jruby-openssl
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@kares @jordansissel