https://bugzilla.redhat.com/show_bug.cgi?id=1127577 Bug ID: 1127577 Summary: IO::Socket::SSL overrides OpensSSL default cipher list to 'ALL:!LOW' undermining aim for system-wide settings Product: Fedora Version: rawhide Component: perl-IO-Socket-SSL Severity: medium Assignee: paul@xxxxxxxxxxxx Reporter: ppisar@xxxxxxxxxx QA Contact: extras-qa@xxxxxxxxxxxxxxxxx CC: antti@xxxxxx, ddas@xxxxxxxxxx, gabe.fahl@xxxxxxxxx, john.a.wagner@xxxxxxxxxxxxxx, jose.p.oliveira.oss@xxxxxxxxx, paul@xxxxxxxxxxxx, perl-devel@xxxxxxxxxxxxxxxxxxxxxxx, ppisar@xxxxxxxxxx, psabata@xxxxxxxxxx, qe-baseos-security@xxxxxxxxxx, tmraz@xxxxxxxxxx Blocks: 1076390 External Bug ID: CPAN 97816 External Bug ID: CPAN 97816 +++ This bug was initially created as a clone of Bug #1127322 +++ +++ This bug was initially created as a clone of Bug #1091316 +++ +++ This bug was initially created as a clone of Bug #1090966 +++ +++ This bug was initially created as a clone of Bug #1044401 +++ [...] --- Additional comment from Tomas Mraz on 2014-04-24 12:55:23 GMT --- The SSL_version setting is probably no problem. However the ALL cipher list string really should not be used. Either the cipher list should not be set at all or the 'DEFAULT' string could be used. [...] --- Additional comment from Petr Pisar on 2014-04-25 07:08:43 GMT --- How to test: (1) Start an SSL server. (2) Run a simple Net::LDAPS client without `ciphers' option against the server. (3) Compare list of ciphers advertised by the client to the server against DEFAULT OpenSSL list (see `openssl ciphers DEFAULT' command output). Before: The lists differ. After: The lists are identical. [...] --- Additional comment from Petr Pisar on 2014-08-06 16:08:46 GMT --- See bug #1090966 for testing instructions. However please note that current IO::Socket:SSL Perl module (perl-IO-Socket-SSL-1.94-3.el7.noarch) does not respect OpenSSL defaults and overrides it: SSL_cipher_list If this option is set the cipher list for the connection will be set to the given value, e.g. something like 'ALL:!LOW:!EXP:!ADH'. Look into the OpenSSL documentation (<http://www.openssl.org/docs/apps/ciphers.html#CIPHER_STRINGS>) for more details. If this option is not set 'ALL:!LOW' will be used. To use OpenSSL builtin default (whatever this is) set it to ''. This undermines this perl-Net-LDAP fix and causes sneaking some ciphers into Net::LDAP application: --- default.sorted 2014-08-06 16:36:58.176000000 +0200 +++ fixed.sorted 2014-08-06 16:35:23.573000000 +0200 @@ -1,3 +1,18 @@ +ADH-AES128-GCM-SHA256 +ADH-AES128-SHA +ADH-AES128-SHA256 +ADH-AES256-GCM-SHA384 +ADH-AES256-SHA +ADH-AES256-SHA256 +ADH-CAMELLIA128-SHA +ADH-CAMELLIA256-SHA +ADH-DES-CBC3-SHA +ADH-RC4-MD5 +ADH-SEED-SHA +AECDH-AES128-SHA +AECDH-AES256-SHA +AECDH-DES-CBC3-SHA +AECDH-RC4-SHA AES128-GCM-SHA256 AES128-SHA AES128-SHA256 @@ -59,17 +74,15 @@ ECDH-RSA-RC4-SHA EDH-DSS-DES-CBC3-SHA EDH-RSA-DES-CBC3-SHA +EXP-ADH-DES-CBC-SHA +EXP-ADH-RC4-MD5 +EXP-DES-CBC-SHA +EXP-EDH-DSS-DES-CBC-SHA +EXP-EDH-RSA-DES-CBC-SHA +EXP-RC2-CBC-MD5 +EXP-RC4-MD5 IDEA-CBC-SHA -KRB5-DES-CBC3-MD5 -KRB5-DES-CBC3-SHA -KRB5-IDEA-CBC-MD5 -KRB5-IDEA-CBC-SHA -KRB5-RC4-MD5 -KRB5-RC4-SHA - -3DES-EDE-CBC-SHA -PSK-AES128-CBC-SHA -PSK-AES256-CBC-SHA -PSK-RC4-SHA RC4-MD5 RC4-SHA SEED-SHA The erroneous cipher-suites are the ADH and AECDH and EXP ones. I will report bug against perl-IO-Socket-SSL. (The KRB5 and PSK ones are not present in the Net::LDAP client because no Kerberos, nor PSK TLS authentication has been available when running the client. These misses are fine.) ---- Fedora (perl-IO-Socket-SSL-1.997-1) is affected too. Current IO::Socket::SSL uses stronger cipher list than ALL:!LOW, but it still diverts from the OpenSSL default: [...] The default setting prefers ciphers with forward secrecy, disables anonymous authentication and disables known insecure ciphers like MD5, DES etc. This gives a grade A result at the tests of SSL Labs. To use the less secure OpenSSL builtin default (whatever this is) set SSL_cipher_list to ''. Referenced Bugs: https://bugzilla.redhat.com/show_bug.cgi?id=1076390 [Bug 1076390] System-wide crypto policy -- You are receiving this mail because: You are on the CC list for the bug. Unsubscribe from this bug https://bugzilla.redhat.com/token.cgi?t=UtQxJ3Zvr2&a=cc_unsubscribe -- Fedora Extras Perl SIG http://www.fedoraproject.org/wiki/Extras/SIGs/Perl perl-devel mailing list perl-devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/perl-devel
