Single Sign On with Portal to SAP Backend Systems

Single Sign On (SSO) is good documented in the SAP world. This guide to give you a complete working example of how you can enable SSO in your environment.
Step 1 - Setting the logon method as Single Sign on
1.1 Log in to your Portal as a System Administrator.
1.2 Choose System Administration --> System Configuration --> System Landscape
1.3 Find the system you want to assign Single Sign on to and open it
1.4 Choose User Management as Property Category
1.5 Set Logon Method to SAPLOGONTICKET

What we have done now is to set the system you want to use as a Single Sign On logon method. Do this to each system you want to connect.

Step 2 - Create a Portal Certificate
1.1 Log in to the Visual Administrator
1.2 Choose Server --> Services --> KeyStorage --> TicketKeystore
1.3 Delete SAPLogonTicketKeypair-cert and SAPLogonTicketKeypair
1.4 Choose Create (Create button in the Entry field) and
type in the following information:
a. mark Store Certificate
b. Common Name: Your <SID> (just example)
c. Entry Name: SAPLogonTicketKeypair
d. Store Certificate: Mark it
e. Key Length: 1024
f. Algorithm: DSA
g. Press Generate
Now you will have two entries in the TicketKeyStore:
SAPLogonTicketKeypair
SAPLogonTicketKeypair-cert
Step 3 - Export the Portal certificate
3.1 Choose Server --> Services --> KeyStorage --> TicketKeystore
3.2 Choose SAPLogonTicketKeypair-cert and press Export (Export button in the Entry field)
a. Fill in a name of the Certificate
To keep track of your certificate, call it the SID of the Portal
b. Choose either X.509 or Base64 Encoded Format
Step 4 - Import the Portal certificate to the Backend System
4.1 Log in to the Backend System
In my example, I log in to ERP 2004
4.2 Run transaction STRUSTSSO2
4.3 Press Import Certificate (Button in the Certificate field)
a. Open the generated certificate from step 3 with the right file format that you choosed in step 3.4
4.5 Press Add to Certificate List button (Button in the Certificate field)
4.6 Press Add to ACL button (Button in the Certificate field)
a. Enter the <SID> of your Portal
b. Enter Client 000
4.7 Press Save
Step 5 - Export the Backend certificate to your Portal
5.1 You are still in the transaction STRUSTSSO2. Doubleclick the Owner Certificate and choose Export and store in on the file system
5.2 Log into Visual Administrator
Choose Server --> Services --> KeyStorage --> TicketKeystore and press Load and choose the Certificate
5.3 Set the Backend System as "ACL" in the Portal
Choose Server --> Services --> Security --> Provider --> Ticket
Choose the Authentication tab and add the following on the com.sap.security.core.server.jass.EvaluateTicketLoginModule:
�› trustedsys<Number>=<ABAP_SID>, <CLIENT> (for example, ABA, 200)
�› trustediss<Number>=<ISSUER_DISTINGUISHED_NAME> (for example, CN= ABA)
�› trusteddn<Number>=<SUBJECT_DISTINGUISHED_NAME> (for example, CN=ABA)

You have set up a trusted relationship between your portal and the backend system. To do so with several system, run this guide again from step 4.