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Add algo signer to support openssl as of recent (#12438) 

"algorithm_signer": "rsa-sha2-256"
to prevent /var/log/auth.log `userauth_pubkey: certificate signature algorithm ssh-rsa: signature algorithm not supported [preauth]` due to vault defaulting to ssh-rsa which is insecure
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Mike Green 2022-01-19 16:37:00 -07:00 committed by GitHub
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commit 364d7a9be1
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website/content/docs/secrets/ssh/signed-ssh-certificates.mdx
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@ -114,6 +114,7 @@ team, or configuration management tooling.
```text
$ vault write ssh-client-signer/roles/my-role -<<"EOH"
{
"algorithm_signer": "rsa-sha2-256",
"allow_user_certificates": true,
"allowed_users": "*",
"allowed_extensions": "permit-pty,permit-port-forwarding",