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ssh-env-config.sh
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ssh-env-config.sh
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#!/bin/bash
# This command wrapper sets up SSH config files based on the following
# environment variables:
#
# SSH_CONFIG - contents of an SSH config file
# SSH_KNOWN_HOSTS - contents of a SSH known_hosts file
# SSH_PRIVATE_DSA_KEY - contents of an SSH private DSA key
# SSH_PRIVATE_ECDSA_KEY - contents of an SSH private ECDSA key
# SSH_PRIVATE_ED25519_KEY - contents of an SSH private ED25519 key
# SSH_PRIVATE_RSA_KEY - contents of an SSH private RSA key
# SSH_DEBUG - switch to a high debug level 3 for all hosts, to help solve SSH issues
#
# The environment variables are unset after the files are created to help
# prevent accidental output in logs
set -e
if [ -z "$SSH_CONFIG" ] && \
[ -z "$SSH_CONFIG_B64" ] && \
[ -z "$SSH_CONFIG_PATH" ] && \
[ -z "$SSH_KNOWN_HOSTS" ] && \
[ -z "$SSH_KNOWN_HOSTS_B64" ] && \
[ -z "$SSH_KNOWN_HOSTS_PATH" ] && \
[ -z "$SSH_PRIVATE_DSA_KEY" ] && \
[ -z "$SSH_PRIVATE_DSA_KEY_B64" ] && \
[ -z "$SSH_PRIVATE_DSA_KEY_PATH" ] && \
[ -z "$SSH_PRIVATE_ECDSA_KEY" ] && \
[ -z "$SSH_PRIVATE_ECDSA_KEY_B64" ] && \
[ -z "$SSH_PRIVATE_ECDSA_KEY_PATH" ] && \
[ -z "$SSH_PRIVATE_ED25519_KEY" ] && \
[ -z "$SSH_PRIVATE_ED25519_KEY_B64" ] && \
[ -z "$SSH_PRIVATE_ED25519_KEY_PATH" ] && \
[ -z "$SSH_PRIVATE_RSA_KEY" ] && \
[ -z "$SSH_PRIVATE_RSA_KEY_B64" ] && \
[ -z "$SSH_PRIVATE_RSA_KEY_PATH" ] && \
[ -z "$SSH_DEBUG" ]; then
# none of the ENV vars we care about found, so skip the logic in this script
[[ $1 ]] && exec "$@"
fi
mkdir -p ~/.ssh
chmod 700 ~/.ssh
decode_base64() {
# Determine the platform dependent base64 decode argument
if [ "$(echo 'eA==' | base64 -d 2> /dev/null)" = 'x' ]; then
local BASE64_DECODE_ARG='-d'
else
local BASE64_DECODE_ARG='--decode'
fi
echo "$1" | tr -d '\n' | base64 "$BASE64_DECODE_ARG"
}
## ~/.ssh/config
[[ ! -z "$SSH_CONFIG" ]] && \
echo "$SSH_CONFIG" > ~/.ssh/config && \
chmod 600 ~/.ssh/config && \
unset SSH_CONFIG
[[ ! -z "$SSH_CONFIG_B64" ]] && \
decode_base64 "$SSH_CONFIG_B64" > ~/.ssh/config && \
chmod 600 ~/.ssh/config && \
unset SSH_CONFIG_B64
[[ ! -z "$SSH_CONFIG_PATH" && ! -a ~/.ssh/config ]] && \
cp "$SSH_CONFIG_PATH" ~/.ssh/config && \
chmod 600 ~/.ssh/config && \
unset SSH_CONFIG_PATH
## ~/.ssh/known_hosts
[[ ! -z "$SSH_KNOWN_HOSTS" ]] && \
echo "$SSH_KNOWN_HOSTS" > ~/.ssh/known_hosts && \
chmod 600 ~/.ssh/known_hosts && \
unset SSH_KNOWN_HOSTS
[[ ! -z "$SSH_KNOWN_HOSTS_B64" ]] && \
decode_base64 "$SSH_KNOWN_HOSTS_B64" > ~/.ssh/known_hosts && \
chmod 600 ~/.ssh/known_hosts && \
unset SSH_KNOWN_HOSTS_B64
[[ ! -z "$SSH_KNOWN_HOSTS_PATH" && ! -a ~/.ssh/known_hosts ]] && \
cp "$SSH_KNOWN_HOSTS_PATH" ~/.ssh/known_hosts && \
chmod 600 ~/.ssh/known_hosts && \
unset SSH_KNOWN_HOSTS_PATH
## ~/.ssh/id_dsa
[[ ! -z "$SSH_PRIVATE_DSA_KEY" ]] && \
echo "$SSH_PRIVATE_DSA_KEY" > ~/.ssh/id_dsa && \
chmod 600 ~/.ssh/id_dsa && \
unset SSH_PRIVATE_DSA_KEY
[[ ! -z "$SSH_PRIVATE_DSA_KEY_B64" ]] && \
decode_base64 "$SSH_PRIVATE_DSA_KEY_B64" > ~/.ssh/id_dsa && \
chmod 600 ~/.ssh/id_dsa && \
unset SSH_PRIVATE_DSA_KEY_B64
[[ ! -z "$SSH_PRIVATE_DSA_KEY_PATH" && ! -a ~/.ssh/id_dsa ]] && \
cp "$SSH_PRIVATE_DSA_KEY_PATH" ~/.ssh/id_dsa && \
chmod 600 ~/.ssh/id_dsa && \
unset SSH_PRIVATE_DSA_KEY_PATH
## ~/.ssh/id_ecdsa
[[ ! -z "$SSH_PRIVATE_ECDSA_KEY" ]] && \
echo "$SSH_PRIVATE_ECDSA_KEY" > ~/.ssh/id_ecdsa && \
chmod 600 ~/.ssh/id_ecdsa && \
unset SSH_PRIVATE_ECDSA_KEY
[[ ! -z "$SSH_PRIVATE_ECDSA_KEY_B64" ]] && \
decode_base64 "$SSH_PRIVATE_ECDSA_KEY_B64" > ~/.ssh/id_ecdsa && \
chmod 600 ~/.ssh/id_ecdsa && \
unset SSH_PRIVATE_ECDSA_KEY_B64
[[ ! -z "$SSH_PRIVATE_ECDSA_KEY_PATH" && ! -a ~/.ssh/id_ecdsa ]] && \
cp "$SSH_PRIVATE_ECDSA_KEY_PATH" ~/.ssh/id_ecdsa && \
chmod 600 ~/.ssh/id_ecdsa && \
unset SSH_PRIVATE_ECDSA_KEY_PATH
## ~/.ssh/id_ed25519
[[ ! -z "$SSH_PRIVATE_ED25519_KEY" ]] && \
echo "$SSH_PRIVATE_ED25519_KEY" > ~/.ssh/id_ed25519 && \
chmod 600 ~/.ssh/id_ed25519 && \
unset SSH_PRIVATE_ED25519_KEY
[[ ! -z "$SSH_PRIVATE_ED25519_KEY_B64" ]] && \
decode_base64 "$SSH_PRIVATE_ED25519_KEY_B64" > ~/.ssh/id_ed25519 && \
chmod 600 ~/.ssh/id_ed25519 && \
unset SSH_PRIVATE_ED25519_KEY_B64
[[ ! -z "$SSH_PRIVATE_ED25519_KEY_PATH" && ! -a ~/.ssh/id_ed25519 ]] && \
cp "$SSH_PRIVATE_ED25519_KEY_PATH" ~/.ssh/id_ed25519 && \
chmod 600 ~/.ssh/id_ed25519 && \
unset SSH_PRIVATE_ED25519_KEY_PATH
## ~/.ssh/id_rsa
[[ ! -z "$SSH_PRIVATE_RSA_KEY" ]] && \
echo "$SSH_PRIVATE_RSA_KEY" > ~/.ssh/id_rsa && \
chmod 600 ~/.ssh/id_rsa && \
unset SSH_PRIVATE_RSA_KEY
[[ ! -z "$SSH_PRIVATE_RSA_KEY_B64" ]] && \
decode_base64 "$SSH_PRIVATE_RSA_KEY_B64" > ~/.ssh/id_rsa && \
chmod 600 ~/.ssh/id_rsa && \
unset SSH_PRIVATE_RSA_KEY_B64
[[ ! -z "$SSH_PRIVATE_RSA_KEY_PATH" && ! -a ~/.ssh/id_rsa ]] && \
cp "$SSH_PRIVATE_RSA_KEY_PATH" ~/.ssh/id_rsa && \
chmod 600 ~/.ssh/id_rsa && \
unset SSH_PRIVATE_RSA_KEY_PATH
## ssh debug mode
[[ ! -z "$SSH_DEBUG" ]] && \
touch ~/.ssh/config && \
chmod 600 ~/.ssh/config && \
echo -e "Host *\n LogLevel DEBUG3" >> ~/.ssh/config && \
unset SSH_DEBUG
[[ $1 ]] && exec "$@"