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* ext/openssl/ossl_ssl.c: Add SSL constants and allow to unset SSL 

option to prevent BEAST attack. See [Bug #5353].

  In OpenSSL, OP_DONT_INSERT_EMPTY_FRAGMENTS is used to prevent
  TLS-CBC-IV vulunerability described at
  http://www.openssl.org/~bodo/tls-cbc.txt
  It's known issue of TLSv1/SSLv3 but it attracts lots of attention
  these days as BEAST attack. (CVE-2011-3389)

  Until now ossl sets OP_ALL at SSLContext allocation and call
  SSL_CTX_set_options at connection.  SSL_CTX_set_options updates the
  value by using |= so bits set by OP_ALL cannot be unset afterwards.

  This commit changes to call SSL_CTX_set_options only 1 time for each
  SSLContext. It sets the specified value if SSLContext#options= are
  called and sets OP_ALL if not.

  To help users to unset bits in OP_ALL, this commit also adds several
  constant to SSL such as
  OpenSSL::SSL::OP_DONT_INSERT_EMPTY_FRAGMENTS.  These constants were
  not exposed in Ruby because there's no way to unset bits in OP_ALL
  before.

  Following is an example to enable 0/n split for BEAST prevention.

    ctx.options = OP_ALL & ~OP_DONT_INSERT_EMPTY_FRAGMENTS

* test/openssl/test_ssl.rb: Test above option exists.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@34482 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nahi 2012-02-08 05:27:14 +00:00
Родитель 45706e70c9
Коммит 3ff2f9f3a3
3 изменённых файлов: 64 добавлений и 13 удалений
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31
ChangeLog
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@ -1,3 +1,34 @@
Wed Feb 8 14:06:59 2012 Hiroshi Nakamura <nahi@ruby-lang.org>
* ext/openssl/ossl_ssl.c: Add SSL constants and allow to unset SSL
option to prevent BEAST attack. See [Bug #5353].
In OpenSSL, OP_DONT_INSERT_EMPTY_FRAGMENTS is used to prevent
TLS-CBC-IV vulunerability described at
http://www.openssl.org/~bodo/tls-cbc.txt
It's known issue of TLSv1/SSLv3 but it attracts lots of attention
these days as BEAST attack. (CVE-2011-3389)
Until now ossl sets OP_ALL at SSLContext allocation and call
SSL_CTX_set_options at connection. SSL_CTX_set_options updates the
value by using |= so bits set by OP_ALL cannot be unset afterwards.
This commit changes to call SSL_CTX_set_options only 1 time for each
SSLContext. It sets the specified value if SSLContext#options= are
called and sets OP_ALL if not.
To help users to unset bits in OP_ALL, this commit also adds several
constant to SSL such as
OpenSSL::SSL::OP_DONT_INSERT_EMPTY_FRAGMENTS. These constants were
not exposed in Ruby because there's no way to unset bits in OP_ALL
before.
Following is an example to enable 0/n split for BEAST prevention.
ctx.options = OP_ALL & ~OP_DONT_INSERT_EMPTY_FRAGMENTS
* test/openssl/test_ssl.rb: Test above option exists.
Wed Feb 8 13:12:02 2012 Martin Bosslet <Martin.Bosslet@googlemail.com>
* ext/openssl/ossl_x509name.c: Use the numerical representation of

31
ext/openssl/ossl_ssl.c
Просмотреть файл

@ -151,7 +151,6 @@ ossl_sslctx_s_alloc(VALUE klass)
ossl_raise(eSSLError, "SSL_CTX_new");
}
SSL_CTX_set_mode(ctx, mode);
SSL_CTX_set_options(ctx, SSL_OP_ALL);
return Data_Wrap_Struct(klass, 0, ossl_sslctx_free, ctx);
}
@ -643,7 +642,11 @@ ossl_sslctx_setup(VALUE self)
if(!NIL_P(val)) SSL_CTX_set_verify_depth(ctx, NUM2INT(val));
val = ossl_sslctx_get_options(self);
if(!NIL_P(val)) SSL_CTX_set_options(ctx, NUM2LONG(val));
if(!NIL_P(val)) {
SSL_CTX_set_options(ctx, NUM2LONG(val));
} else {
SSL_CTX_set_options(ctx, SSL_OP_ALL);
}
rb_obj_freeze(self);
val = ossl_sslctx_get_sess_id_ctx(self);
@ -1967,18 +1970,20 @@ Init_ossl_ssl()
ossl_ssl_def_const(VERIFY_PEER);
ossl_ssl_def_const(VERIFY_FAIL_IF_NO_PEER_CERT);
ossl_ssl_def_const(VERIFY_CLIENT_ONCE);
/* Not introduce constants included in OP_ALL such as...
* ossl_ssl_def_const(OP_MICROSOFT_SESS_ID_BUG);
* ossl_ssl_def_const(OP_NETSCAPE_CHALLENGE_BUG);
* ossl_ssl_def_const(OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG);
* ossl_ssl_def_const(OP_SSLREF2_REUSE_CERT_TYPE_BUG);
* ossl_ssl_def_const(OP_MICROSOFT_BIG_SSLV3_BUFFER);
* ossl_ssl_def_const(OP_MSIE_SSLV2_RSA_PADDING);
* ossl_ssl_def_const(OP_SSLEAY_080_CLIENT_DH_BUG);
* ossl_ssl_def_const(OP_TLS_D5_BUG);
* ossl_ssl_def_const(OP_TLS_BLOCK_PADDING_BUG);
* ossl_ssl_def_const(OP_DONT_INSERT_EMPTY_FRAGMENTS);
/* Introduce constants included in OP_ALL. These constants are mostly for
* unset some bits in OP_ALL such as;
* ctx.options = OP_ALL & ~OP_DONT_INSERT_EMPTY_FRAGMENTS
*/
ossl_ssl_def_const(OP_MICROSOFT_SESS_ID_BUG);
ossl_ssl_def_const(OP_NETSCAPE_CHALLENGE_BUG);
ossl_ssl_def_const(OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG);
ossl_ssl_def_const(OP_SSLREF2_REUSE_CERT_TYPE_BUG);
ossl_ssl_def_const(OP_MICROSOFT_BIG_SSLV3_BUFFER);
ossl_ssl_def_const(OP_MSIE_SSLV2_RSA_PADDING);
ossl_ssl_def_const(OP_SSLEAY_080_CLIENT_DH_BUG);
ossl_ssl_def_const(OP_TLS_D5_BUG);
ossl_ssl_def_const(OP_TLS_BLOCK_PADDING_BUG);
ossl_ssl_def_const(OP_DONT_INSERT_EMPTY_FRAGMENTS);
ossl_ssl_def_const(OP_ALL);
#if defined(SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)
ossl_ssl_def_const(OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION);

15
test/openssl/test_ssl.rb
Просмотреть файл

@ -422,6 +422,21 @@ class OpenSSL::TestSSL < OpenSSL::SSLTestCase
}
}
end
def test_unset_OP_ALL
ctx_proc = Proc.new { |ctx|
ctx.options = OpenSSL::SSL::OP_ALL & ~OpenSSL::SSL::OP_DONT_INSERT_EMPTY_FRAGMENTS
}
start_server(PORT, OpenSSL::SSL::VERIFY_NONE, true, :ctx_proc => ctx_proc){|server, port|
sock = TCPSocket.new("127.0.0.1", port)
ssl = OpenSSL::SSL::SSLSocket.new(sock)
ssl.sync_close = true
ssl.connect
ssl.puts('hello')
assert_equal("hello\n", ssl.gets)
ssl.close
}
end
end
end