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Description of problem: It is not possible to connect to the Oracle Internet Directory (version 9.0.4) with OpenLDAP using LDAPs. The problem is related to an security fix introduced in OpenSSL version 0.9.6d. (see: Implement a countermeasure against a vulnerability recently found in CBC ciphersuites in SSL 3.0/TLS 1.0 by Bodo Moeller in the openssl changelog). This fix seems not to be compliant with the SSL implementation used by Oracle. Solution would be to set the SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS option within the SSL_CTX of the libldap code. (see the attached patch). This patch on the other side may cause security problems :-(. Version-Release number of selected component (if applicable): Fedora Core 1: OpenLDAP 2.1.22-8 OpenSSL 0.9.7a-33.10 RHEL 3: OpenLDAP 2.0.27-11 OpenSSL 0.9.7a-22.1 How reproducible: always Steps to Reproduce: 1. setup a custom configset for Oracle Internet Directory using SSL Server Authentication 2. create $HOME/ldaprc with: --- TLS_CACERT /home/frank/oid-caroot.pem TLS_REQCERT allow TLS_CIPHERS SSLv3 ssl on tls_checkpeer no --- 3. try to perform the following ldapsearch command: --- ldapsearch -D "cn=orcladmin,cn=Users,dc=fm-berger,dc=de" -w password -H ldaps://fm-berger.de:4055/ -d 7 -b "cn=Users,dc=fm-berger,dc=de" -x "(objectclass=*)" --- see the attached output of this command. Actual results: 1. initial SSL handshake works 2. ldap-bind request is send 3. connection is terminated by OID lapsearch output: --- TLS trace: SSL3 alert read:fatal:close notify ldap_read: want=8, got=0 ldap_perror ldap_bind: Can't contact LDAP server (-1) --- Expected results: successful ldaps connection with result. Additional info: This issue is also filed to Oracle Metalink under the TAR-ID: 3788414.996 (EL 5/20 MORE INFORMATION FOR OID/SSL / TLS SUPPORTED?)
Created attachment 100402 [details] debug output of the ldapsearch command used to show the problem
Created attachment 100403 [details] quick&dirty fix for the problem setting SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS Warning! This patch may cause security problems when applied!
This bug is filed against RHEL 3, which is in maintenance phase. During the maintenance phase, only security errata and select mission critical bug fixes will be released for enterprise products. Since this bug does not meet that criteria, it is now being closed. For more information of the RHEL errata support policy, please visit: http://www.redhat.com/security/updates/errata/ If you feel this bug is indeed mission critical, please contact your support representative. You may be asked to provide detailed information on how this bug is affecting you.