


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:
-
Obtain the Cisco Umbrella certificate:
- Visit the Cisco certificate download page and retrieve the ".cer" file.
-
Convert the certificate:
-
Convert the ".cer" file to a ".crt" file using the command:
- openssl x509 -inform DER -in ciscoumbrellaroot.cer -out ciscoumbrellaroot.crt
-
-
Copy the certificate:
-
Copy the ".crt" file to the certificate folder:
- cp ciscoumbrellaroot.crt /usr/local/share/ca-certificates/ciscoumbrellaroot.crt
-
-
Update certificates:
-
Run the command:
- update-ca-certificates
-
-
Confirm the update:
- The terminal should display a message indicating the update was successful.
-
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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