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Add public keys from github (#254)

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I've added a script that downloads keys from either a line separated file or github public keys into the authorized keys file. I've tested that it's working sucessfully on my UDM Pro while it was running, and with a reset.
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Adam Bolsover 2021-10-21 06:31:17 +01:00 committed by GitHub
parent 2a1631c052
commit 465c4ea4d0
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on-boot-script/examples/udm-files/on_boot.d/15-add-github-ssh-keys.sh Normal file
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#!/bin/sh
## Config Variables - please edit these
# Set to true to download public keys from a github user account
USE_GITHUB_KEYS=true
# Enter your username on github to get the public keys for
GITHUB_USER="<YOUR_USERNAME>"
# File location for the output of the git download
GITHUB_KEY_PATH="/mnt/data/podman/ssh"
GITHUB_KEY_FILE="${GITHUB_KEY_PATH}/github.keys"
# Set to true to use a file containing a key per line in the format ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAA...\n
USE_KEY_FILE=true
# IF using an input file, list it here
INPUT_KEY_PATH="/mnt/data/podman/ssh"
INPUT_KEY_FILE="${INPUT_KEY_PATH}/ssh.keys"
# The target key file for the script
OUTPUT_KEY_PATH="/root/.ssh"
OUTPUT_KEY_FILE="${OUTPUT_KEY_PATH}/authorized_keys"
## Functions
# This function downloads the keys from the selected github user
download_from_github(){
if curl --output /dev/null --silent --head --fail https://github.com/${GITHUB_USER}.keys; then
curl https://github.com/${GITHUB_USER}.keys -o ${GITHUB_KEY_FILE}
echo "Downloaded keys from Github"
else
echo "Could not download ${GITHUB_USER}'s key file from github"
fi
}
# Write line to the output line. Add the input line as an arguement.
write_to_output(){
# Check the file exits
if ! test -f ${OUTPUT_KEY_FILE}; then
echo "File at ${OUTPUT_KEY_FILE} does not exist, creating it"
touch ${OUTPUT_KEY_FILE}
fi
echo "${1}" >> ${OUTPUT_KEY_FILE}
}
# This function reads keys from a file into the requested file. The arguement is the input file.
use_key_from_file(){
if ! test -f $1; then
echo "File $1 does not exist"
return
fi
counter=0;
while IFS= read -r line;
do
write_to_output "${line}"
let "counter++"
done < $1
echo "${counter} number of entries read from "
}
## Script
# Makes paths if they don't exit
mkdir -p ${GITHUB_KEY_PATH} ${INPUT_KEY_PATH} ${OUTPUT_KEY_PATH}
#Check flags to see which files to use
if [ ${USE_GITHUB_KEYS} = true ]; then
download_from_github
use_key_from_file ${GITHUB_KEY_FILE}
fi
if [ ${USE_KEY_FILE} = true ]; then
use_key_from_file ${INPUT_KEY_FILE}
fi