How to Fix \'x509: certificate signed by unknown authority\' Error in Docker Go Images?

Docker Go Image Error: "x509: certificate signed by unknown authority"

When installing packages within a Docker Go image, users may encounter an error message indicating "x509: certificate signed by unknown authority." This issue stems from a lack of trust in the traffic being re-signed by security clients like Cisco AnyConnect "Umbrella."

Solution:

To resolve this error, it is crucial to add the "Cisco Umbrella Root CA" certificate to the Docker file.

Steps:

1. Obtain the Cisco Umbrella certificate:

   • Visit the Cisco certificate download page and retrieve the ".cer" file.

2. Convert the certificate:

   • Convert the ".cer" file to a ".crt" file using the command:

     • openssl x509 -inform DER -in ciscoumbrellaroot.cer -out ciscoumbrellaroot.crt

3. Copy the certificate:

   • Copy the ".crt" file to the certificate folder:

     • cp ciscoumbrellaroot.crt /usr/local/share/ca-certificates/ciscoumbrellaroot.crt

4. Update certificates:

   • Run the command:

     • update-ca-certificates

5. Confirm the update:

   • The terminal should display a message indicating the update was successful.

6. Test the package installation:

   • Reattempt the installation of the desired package:

     • go install google.golang.org/protobuf/cmd/[email protected]

By following these steps, Docker Go images can now successfully install packages without encountering the "x509: certificate signed by unknown authority" error. This solution is applicable to any security client that may be acting as a man-in-the-middle and re-signing traffic.

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