Tuesday, September 30, 2014

EBS,SSO -- enabling SSL on SSO due to security vulnerability

Some day or another, your security team may indicate a vulnerability in EBS login..
They may record this vulnerability according to security findings, especially when they listen the client machine and get the password used while the client user logging with his/her credentials..
That is ; an attacker who traces the client machine, could obtain the user and password information supplied by the users during EBS logins through the web browser.
If EBS is not a SSO integrated EBS, this should be considered as an EBS security vulnerability, and can be fixed using EBS SSL implementation, as I documented in the following link;

On the other hand; If  a SSO server (Oracle SSO) is integrated to EBS, this should be considered as a SSO security vulnerability, and can be fixed using SSO SSL implementation and this will be the subject of this post..

Okay, when you integrate SSO to your EBS system, your login page comes from the SSO server. SSO servers the login..
So , actually the client supplies the user and/pass to the SSO system ..
That's why , the traffic between the client and the SSO server should be encrypted  to encyrpt the user/pass information transferred from client to server.. Ofcourse, to be in the safe side -> SSL should be implemented in EBS and OID , too.. However; these kind of operations are not in the scope of this post.

Following diagram represent an EBS R12 environment , which utilizes integrated SSO 10g and OID 11g products.

So , as you see above, SSO serves the login page and user/pass info flows unencyrpted through the line.
In order to fix this; it is obvious that, SSO server should be configured to work with SSL.

To implement SSL in SSO 10g, we can follow the action plan below;

Create a wallet , export certificate request and send them to the security admins who are responsible for producing the corresponding certificate files. Once you got the certificate files, import them to your wallet.
Note that: you need to use the owm binary located in your SSO 10G Oracle Home.. So set your path accordingly.. If you use owm binary located in another Oracle Home ,for example: OID 11g Home(suppose you have OID 11g and SSO 10G running on the same server), you ll encounter problems..

In SSO Server;
In opmn.xml, change the value for the start-mode parameter to ssl-enabled.

<ias-component id="HTTP_Server">
<process-type id="HTTP_Server" module-id="OHS">
<category id="start-parameters">
<data id="start-mode" value="ssl-enabled"/>
<process-set id="HTTP_Server" numprocs="1"/>

In SSO Server;
Note that: If you are using Distributed Configuration Management; update your distributed cluster management database using -> $ORACLE_HOME/dcm/bin/dcmctl updateconfig -ct opmn

Reload the modified opmn configuration file:
$ORACLE_HOME/opmn/bin/opmnctl reload

In SSO Server;
Restart Oracle HTTP Server.

$ORACLE_HOME/opmn/bin/opmnctl stopproc process-type=HTTP_Server
$ORACLE_HOME/opmn/bin/opmnctl startproc process-type=HTTP_Server

In SSO Server;
Change single server urls using ssocfg.sh
$ORACLE_HOME/sso/bin/ssocfg.sh protocol host ssl_port
For ex: ssocfg.sh https ermanhost.domain 4443

Check, OID odsm;open cn=OracleContext>cn=Products>cn=DA and select cn=OperationURLs, The right hand pane will display a number of fields or attributes. The last field will be orcldasurlbase and will
should be set to sso server and its https port.
Clear the cache of OID, just in case;

Clear oid cache by connecting to OID database using sqlplus.. (with orasso user) and executing the following;
sqlplus orasso/(orasso_password) --> find it first

-To find Orasso Password:

echo "enter username :\c "
read username
echo "enter orcladmin password :\c "
read orclpass
echo "enter oid port :\c "
read oid_port
host=`uname -n`
ldapsearch -D cn=orcladmin -w $orclpass -p $oid_port -h $host \
-b "cn=IAS,cn=Products,cn=OracleContext" \
-s sub -v OrclresourceName=$username | grep orclpasswordattribute |cut -d= -f

In SSO Server;
update $ORACLE_HOME/sysman/emd/targets.xml file.

Update the three attributes this way:
<Property NAME="HTTPMachine" VALUE="ermanhost.domain"/>
<Property NAME="HTTPPort" VALUE="4443"/>
<Property NAME="HTTPProtocol" VALUE="HTTPS"/>

and reload the conf.. -> $ORACLE_HOME/bin/emctl reload

In SSO Server;
Restart your HTTP Server and OC4J Security processes..
$ORACLE_HOME/opmn/bin/opmnctl restartproc process-type=HTTP_Server
$ORACLE_HOME/opmn/bin/opmnctl restartproc process-type=OC4J_SECURITY

From the client's browser; 
Check and see that you can reach the SSO server using https.. https://host:ssl_port.
Once you are able to reach the SSO Server  using https without any certificate errors or warnings, continue with the next step

In EBS Server; 
Deregister and register your EBS;
“txkrun.pl -script=SetSSOReg -deregister=Yes”
“txkrun.pl -script=SetSSOReg -removereferences=Yes”
Scripts above, will  deregister SSO & OID from Apps & 10g AS Infrastructure Tier. 

$FND_TOP/bin/txkrun.pl -script=SetSSOReg , and this script will register SSO again.
That 's it.. Now check you EBS.. Your login page should be served by SSO via https..

No comments :

Post a Comment

If you will ask a question, please don't comment here..

For your questions, please create an issue into my forum.

Forum Link: http://ermanarslan.blogspot.com.tr/p/forum.html

Register and create an issue in the related category.
I will support you from there.