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72 lines
2.6 KiB
Go
72 lines
2.6 KiB
Go
package ssh
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const (
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// This is a constant representing a script to install and uninstall public
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// key in remote hosts.
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DefaultPublicKeyInstallScript = `
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#!/bin/bash
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#
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# This is a default script which installs or uninstalls an RSA public key to/from
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# authorized_keys file in a typical linux machine.
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#
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# If the platform differs or if the binaries used in this script are not available
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# in target machine, use the 'install_script' parameter with 'roles/' endpoint to
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# register a custom script (applicable for Dynamic type only).
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#
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# Vault server runs this script on the target machine with the following params:
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#
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# $1:INSTALL_OPTION: "install" or "uninstall"
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#
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# $2:PUBLIC_KEY_FILE: File name containing public key to be installed. Vault server
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# uses UUID as name to avoid collisions with public keys generated for other requests.
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#
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# $3:AUTH_KEYS_FILE: Absolute path of the authorized_keys file.
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# Currently, vault uses /home/<username>/.ssh/authorized_keys as the path.
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#
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# [Note: This script will be run by Vault using the registered admin username.
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# Notice that some commands below are run as 'sudo'. For graceful execution of
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# this script there should not be any password prompts. So, disable password
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# prompt for the admin username registered with Vault.
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set -e
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# Storing arguments into variables, to increase readability of the script.
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INSTALL_OPTION=$1
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PUBLIC_KEY_FILE=$2
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AUTH_KEYS_FILE=$3
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# Delete the public key file and the temporary file
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function cleanup
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{
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rm -f "$PUBLIC_KEY_FILE" temp_$PUBLIC_KEY_FILE
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}
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# 'cleanup' will be called if the script ends or if any command fails.
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trap cleanup EXIT
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# Return if the option is anything other than 'install' or 'uninstall'.
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if [ "$INSTALL_OPTION" != "install" ] && [ "$INSTALL_OPTION" != "uninstall" ]; then
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exit 1
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fi
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# use locking to avoid parallel script execution
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(
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flock --timeout 10 200
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# Create the .ssh directory and authorized_keys file if it does not exist
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SSH_DIR=$(dirname $AUTH_KEYS_FILE)
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sudo mkdir -p "$SSH_DIR"
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sudo touch "$AUTH_KEYS_FILE"
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# Remove the key from authorized_keys file if it is already present.
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# This step is common for both install and uninstall. Note that grep's
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# return code is ignored, thus if grep fails all keys will be removed
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# rather than none and it fails secure
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sudo grep -vFf "$PUBLIC_KEY_FILE" "$AUTH_KEYS_FILE" > temp_$PUBLIC_KEY_FILE || true
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cat temp_$PUBLIC_KEY_FILE | sudo tee "$AUTH_KEYS_FILE"
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# Append the new public key to authorized_keys file
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if [ "$INSTALL_OPTION" == "install" ]; then
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cat "$PUBLIC_KEY_FILE" | sudo tee --append "$AUTH_KEYS_FILE"
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fi
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) 200> ${AUTH_KEYS_FILE}.lock
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`
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)
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