On Wed, Jan 09, 2013 at 01:08:01PM +0400, Konstantin Kolinko wrote: >2013/1/9 Baron Fujimoto <ba...@hawaii.edu>: >> I'm attempting to mitigate BEAST (CVE-2011-3389) attacks on Tomcat 6.0.35. >> My understanding is that the attack applies only to CBC ciphers, and that >> RC4 ciphers are not vulnerable, so I am attempting to restrict the set of >> ciphers that Tomcat uses with the following config for a connector: >> >> <Connector protocol="HTTP/1.1" SSLEnabled="true" >> address="0.0.0.0" >> port="8443" >> maxThreads="150" scheme="https" secure="true" >> keystoreFile="/path/to/keystore" >> keystoreType="pkcs12" >> ciphers="TLS_RSA_WITH_RC4_128_SHA, >> TLS_RSA_WITH_RC4_128_MD5, >> SSL_CK_RC4_128_WITH_MD5" >> clientAuth="false" sslProtocol="TLS" /> >> >> However, when I test this by attempting connections with a script[*] that >> iterates through the set of ciphers available to openssl, it appears to >> successfully connect with the following set of ciphers: >> >> AES128-SHA >> DES-CBC-SHA >> DES-CBC3-SHA >> DHE-RSA-AES128-SHA >> EDH-RSA-DES-CBC-SHA >> EDH-RSA-DES-CBC3-SHA >> EXP-DES-CBC-SHA >> EXP-EDH-RSA-DES-CBC-SHA >> EXP-RC4-MD5 >> EXP-RC4-MD5 >> RC4-MD5 >> RC4-MD5 >> RC4-SHA >> >> [*] The script basically parses the output of the following command: >> openssl s_client -cipher "$cipher" -connect $SERVER >> >> Am I misunderstanding the use of the "ciphers" parameter? Or is there >> perhaps something in my testing methodology that accounts for these >> unexpected results? Any advice would be appreciated. >> > >As can be seen from your usage of "keystoreType" attribute, you are >using Java implementation of the Connector, not openssl/APR one. > >You should look into Java documentation for their cipher names. > >See this thread from October 2009: >http://markmail.org/message/zn4namfhypyxum23
Ahh, that was it! It did not occur to me that OpenSSL and Java might name the ciphers differently. If I restrict the ciphers to those from the (differently named) set used by Java, it works as expected. Mahalo! ciphers="SSL_RSA_WITH_RC4_128_MD5, SSL_RSA_WITH_RC4_128_SHA, TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, TLS_ECDHE_RSA_WITH_RC4_128_SHA, TLS_ECDH_ECDSA_WITH_RC4_128_SHA, TLS_ECDH_RSA_WITH_RC4_128_SHA" -baron -- Baron Fujimoto <ba...@hawaii.edu> :: UH Information Technology Services minutas cantorum, minutas balorum, minutas carboratum desendus pantorum --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org