Terraform Registry: Use signing keys provided from the Registry #19389
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When verifying the signature of the SHA256SUMS file, we have been hardcoding HashiCorp's public GPG key and using it as the keyring. Going forward, Terraform will get a list of valid public keys for a provider from the Terraform Registry (registry.terraform.io), and use them as the keyring for the openpgp verification func.
This is so that any errors output from the checksum/signature verification show up in the expected place in the output.
When GPG verification fails, display a helpful message to the user instead of the generic openpgp error.
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#19389 introduced a change to the provider GPG signature verification process, and removed the hardcoded HashiCorp GPG key. While the changes were intended and are still planned for a future release, we should still be verifying all providers in the TF 0.12.0 release against the HashiCorp GPG key until a more robust key verification procedure is in place. Fixes #20527
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When downloading providers from the Terraform Registry, the API response contains a list of ASCII-armor GPG public keys for the provider publisher.
https://registry.terraform.io/v1/providers/terraform-providers/aws/1.42.0/download/linux/amd64
This changes Terraform to use these returned keys, instead of the previously-hardcoded HashiCorp key, for verifying the signature of the shasums file.
Failure message with a hardcoded bad token:
Success output (unchanged):