[Bug 1127577] New: IO::Socket::SSL overrides OpensSSL default cipher list to 'ALL:!LOW' undermining aim for system-wide settings

[bugzilla at redhat.com]

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 at city-fan.org
          Reporter: ppisar at redhat.com
        QA Contact: extras-qa at fedoraproject.org
                CC: antti at utu.fi, ddas at redhat.com, gabe.fahl at gmail.com,
                    john.a.wagner at wellsfargo.com,
                    jose.p.oliveira.oss at gmail.com, paul at city-fan.org,
                    perl-devel at lists.fedoraproject.org, ppisar at redhat.com,
                    psabata at redhat.com, qe-baseos-security at redhat.com,
                    tmraz at redhat.com
            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
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