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Add public key pinning in authorized-keys command #132

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Add public key pinning in authorized-keys command #132

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2 changes: 1 addition & 1 deletion ansible/tasks/userdb/templates/usr/local/bin/authorized-keys.j2
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
#!/bin/sh

user="$(id -u "$1")"
curl -s "{{ userdb_apidomain }}/v1/ssh_public_key?uid=eq.$user&select=type,key" \
curl --pinnedpubkey "QUfPGxRcqlRoehidvMEsF/R1Ee1MXkb3Sxw+MNTARdY=" -s "{{ userdb_apidomain }}/v1/ssh_public_key?uid=eq.$user&select=type,key" \
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what is this pinned to? our private key or letsencrypt?
the former seems dangerous: we don't really have backups and consider it ephemeral
the latter seems dangerous: if shit happens we might want to use something else

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It is the public key from the certificate which corresponds to your private key. It was retrieved with this command: openssl s_client -servername userdb.hashbang.sh -connect userdb.hashbang.sh:443 | openssl x509 -pubkey -noout | openssl pkey -pubin -outform der | openssl dgst -sha256 -binary | openssl enc -base64

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we don't have backups and consider it ephemeral

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Maybe that should be reconsidered.

| jq -r 'map(.type + " " + .key) | .[]'