After the server certificate is installed, ICM should automatically make use of it. To see if SSL/TLS connections are now working, two tests should be executed:
Check SSL port setup
Access service using TLS
1. Making Sure the SSL Port is set up correctly
This step checks that ICM is configured to accept TLS connections. SAP Help
Select: Goto from the menu and then Services.
Check that HTTPS is listed and note the port number. Here: 8100.
2. Testing the Connection for SSL Server Authentication
With ICM configured to accept TLS connections on port 8100, the last test is to check if it works with a browser. SAP Help. Open a service in your web browser. To check that the service Works, open it first in normal HTTP.
After the CA issued the certificate, it must be imported into the PSE that issued the CSR. During the import step a verification of the private / public key will happen. This ensures that you import the right public key into the PSE. This also means that you cannot use another PSE for the CSR, as the private key would be different. SAP Help
Switch on edit mode and select import certificate.
Inform the path to the CRT.
Select load as local file. If the CA exported the certificate as P7B, the content is in Base64 format. If the CA gave you another format, you`ll have to transform the certificate first to Base64. Would be nice if the import wizard of STRUST would do all that work for you, but somehow Basis guys must also defend their working time …
Confirm the import. To see if the certificate was imported, double click on Subject
This shows the certificate information in the certificate section.
The PSE contains now a private key and a valid public key, signed by a CA. Now ICF can use this certificate without having browsers complain about the certificate.
The certificate request created in the previous step must be send to a CA. The CA is responsible to create a valid server certificate based on the information provided by the CSR.
Important: the certificate emitted by the CA must follow the PKCS#7 certificate chain format. The response file must contain the public key certificate of the ABAP server as well as the CA’s root certificate. SAP Help
The following screenshots are taking from my own CA.
Add an end entity for the server.
Save as p12 (PKCS#7)
You now have a P7B file that contains the signed certificate for the server in Baes64 format.
In the previous step a new PSE for SSL server was created, but the containing server certificate is self-signed. This means that no sane web browser will accept your certificate without showing a warning message to the user. To have a valid server certificate, it must be signed by a CA. To do so, a certificate request must be created. SAP Help
Open SSL Server Standard node and select server
Create a certificate request.
Copy content to a file (via clipboard) and send it to your CA.
You now have the CSR file for the server PSE that can be submitted to a CA.
SAP stores certificates in PSE files (for the Java guys: JKS). By default, there are several PSEs available, one for each use case (system, SSL, web service, etc). A PSE has a subject which stands for the name of the server. Changes are good that the subject value created by SAP does not match your reality. The following steps show how to create a PSE for your SSL server. SAP Help
Change into edit mode:
Select the SSL Server PSE:
Right click to open the context menu and select replace
Give information about the new PSE. This creates a private and public key for the server CN informed for this PSE. The key will be automatically self-signed, but as the PSE contains the private key, it is no problem to create a certificate request and get the certificate signed by a CA.
The data informed here MUST match the data of the HTTPS server. The name field is the CN of the certificate; therefore this field MUST be the same as the FQDN of the server. That is, when the server is accessed by browsers as https://nwgw74.tobias.de, the field MUST be nwgw74.tobias.de.
Confirm the information. Make sure the CN name is correct. This changes the PSE for SSL Server.
You now have a PSE with a private and public key for the CN nwgw74.tobias.de. This certificate is self-signed. While you can now access ICF via HTTPS, each and every browser will give you a warning message that the certificate used is not trustworthy. To change that, a CSR must be created and signed by a CA.
You now have a PSE for the server nwgw74.tobias.de with a private key and a self-signed certificate.
For ICM to work with SSL, some parameters must be set in the profile. These parameters define which PSE and algorithms to use. Normally these parameters are already set to default values. To see if these are acceptable to you and match the location of your CommonCryptoLib 8 installation, you can use transaction RZ11. SAP Help, Central note for CommonCryptoLib.
Here you can enter the name of a parameter and see the currently configured value of it.
Select: Select right OS. In my case, Linux x86 64 bit
Download the latest version
Install SAP Cryptographic Library on the AS ABAP
After downloading the SAP Cryptographic Library it is time to install it on the NW ABAP system. By default, there should already be a version installed. As SAP is constantly releasing a new version, it makes sense to install a newer version and not to use the one delivered with NW ABAP. Copy the downloaded SAR file to your server und “unsar” it. The content of the SAR file will look like:
Copy the files to the executable directory of you instance. In my case, the SID of my ABAP system is GWD. Therefore, the path is /usr/sap/GWD/SYS/exe/run
Command: cp * -Rv /usr/sap/GWD/SYS/exe/run
With this, the latest version is installed on SAP NetWeaver ABAP system.
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