Creating Your Own SSL Certificates For FileMaker

Typically, you buy an SSL certificate for a server from a SSL vendor. However, some companies may decide that they want to issue their own SSL certificates. Often this is because the domain is only used internally, and most vendors don’t easily allow (if at all) the signing of server certificates for non-public domains. Additionally, issuing your own certificates can remove complications caused by the certificate verification process used by most vendors, and there are no fees needed for each certificate.

Although this use case is not supported by FileMaker, I had a client who had no choice but to use their internally signed certificates, and was having issues getting to work on their newly updated server, which had been working fine with FileMaker Server 15. Since I didn’t have access to the server (their security protocols did not allow that), I decided to go through the process of creating my own CA (certificate authority), using it to issue an SSL certificate, and see if I could install it on a test instance of a FileMaker 16 Server.

First step was to create the certificate authority, which I did on a separate macOS system using its Certificate Assistant.

Menu selection used to launch Certificate Assistant

Then started filling out the screens. After the first screen most were left at their default values.

First Certificate Assistant screen for creating a root CA

Once done with the CA, I again used the certificate assistant to create a server SSL certificate using the CA.

First screen for creating server certificate

With that done, I then exported both certificates in p12 format and copied them to my workstation.

In order to load them on to FileMaker Server however, I first had to convert them from .p12 format to .pem format. I used the OpenSSL command to export both the and the certificates.

For the fmtest certificate I also need the key file, so we use a slightly different version for that.

With that, I now imported them in to the FileMaker server. This was a FileMaker Server 16.0v3 system running Windows Server 2016 Standard. Notice that I used the CA certificate as the intermediate certificate in the import dialog.

Importing certificates into FMS

I then restarted the FileMaker Server service. Back on my workstatation, I imported the root CA and marked it as trusted for all certificate types. You’d probably want to be more specific.

Trusting CA using Keychain Access

In order to quickly spoof the hostname without creating actual DNS records I’ve modified my /etc/hosts file so that my workstation will resolve the fmtest hostname to the test server.

I found that I could now go to the site using the hostname with Safari and Chrome and get a SSL lock icon and the expected certificate chain. Here is what it looked like in Safari.

Safari showing the signed certificate

Firefox however did not work. This is at least in part because it manages certificates separately from the OS, so the root certificate was not present when it tried to validate the fmtest certificate. However, importing the certificate at Firefox’s Authorities tab in Certificate Manager wasn’t sufficient, so this remains an outstanding issue.

Possibly more important than Firefox, depending on your usage, was how FileMaker Pro responded. It was strangely conflicted. On one hand, it gave me a warning about being unable to verify the certificate, but when I viewed the certificate information, it indicated a valid certificate.

FileMaker Pro certificate warning

After a bit of digging I found the location for the root CA files in FileMaker Pro and added in my CA certificate there.

Path to root CAs in FileMaker Pro on macOS

I was then able to connect to the server without warnings with FileMaker Pro.


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