107 lines
3.2 KiB
Bash
Executable File
107 lines
3.2 KiB
Bash
Executable File
#!/usr/bin/env ash
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# Modified version of https://github.com/panubo/docker-sshd/blob/55d24e99655e0f18a0c65d9e6bed251c7e1bc097/entry.sh
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# which is published under the MIT license.
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set -e
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[ "$DEBUG" == 'true' ] && set -x
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DAEMON=sshd
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echo "> Starting SSHD"
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# Copy default config from cache, if required
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if [ ! "$(ls -A /etc/ssh)" ]; then
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cp -a /etc/ssh.cache/* /etc/ssh/
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fi
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set_hostkeys() {
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printf '%s\n' \
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'set /files/etc/ssh/sshd_config/HostKey[1] /etc/ssh/keys/ssh_host_rsa_key' \
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'set /files/etc/ssh/sshd_config/HostKey[2] /etc/ssh/keys/ssh_host_dsa_key' \
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'set /files/etc/ssh/sshd_config/HostKey[3] /etc/ssh/keys/ssh_host_ecdsa_key' \
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'set /files/etc/ssh/sshd_config/HostKey[4] /etc/ssh/keys/ssh_host_ed25519_key' \
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}
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print_fingerprints() {
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local BASE_DIR=${1-'/etc/ssh'}
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for item in dsa rsa ecdsa ed25519; do
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echo ">>> Fingerprints for ${item} host key"
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ssh-keygen -E md5 -lf ${BASE_DIR}/ssh_host_${item}_key
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ssh-keygen -E sha256 -lf ${BASE_DIR}/ssh_host_${item}_key
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ssh-keygen -E sha512 -lf ${BASE_DIR}/ssh_host_${item}_key
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done
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}
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check_authorized_key_ownership() {
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local file="$1"
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local _uid="$2"
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local _gid="$3"
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local uid_found="$(stat -c %u ${file})"
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local gid_found="$(stat -c %g ${file})"
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if ! [ "$uid_found" == "$_uid" && "$gid_found" == "$_gid" ] || [ "$uid_found" == "0" && "$gid_found" == "0" ] ; then
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echo "WARNING: Incorrect ownership for ${file}. Expected uid/gid: ${_uid}/${_gid}, found uid/gid: ${uid_found}/${gid_found}. File uid/gid must match SSH_USERS or be root owned."
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fi
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}
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# Generate Host keys, if required
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if ls /etc/ssh/keys/ssh_host_* 1> /dev/null 2>&1; then
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echo ">> Found host keys in keys directory"
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set_hostkeys
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print_fingerprints /etc/ssh/keys
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elif ls /etc/ssh/ssh_host_* 1> /dev/null 2>&1; then
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echo ">> Found Host keys in default location"
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# Don't do anything
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print_fingerprints
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else
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echo ">> Generating new host keys"
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mkdir -p /etc/ssh/keys
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ssh-keygen -A
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mv /etc/ssh/ssh_host_* /etc/ssh/keys/
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set_hostkeys
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print_fingerprints /etc/ssh/keys
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fi
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# Fix permissions, if writable.
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# NB ownership of /etc/authorized_keys are not changed
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if [ -w ~/.ssh ]; then
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chown root:root ~/.ssh && chmod 700 ~/.ssh/
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fi
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if [ -w ~/.ssh/authorized_keys ]; then
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chown root:root ~/.ssh/authorized_keys
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chmod 600 ~/.ssh/authorized_keys
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fi
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if [ -w /etc/authorized_keys ]; then
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chown root:root /etc/authorized_keys
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chmod 755 /etc/authorized_keys
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# test for writability before attempting chmod
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for f in $(find /etc/authorized_keys/ -type f -maxdepth 1); do
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[ -w "${f}" ] && chmod 644 "${f}"
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done
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fi
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stop() {
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echo "Received SIGINT or SIGTERM. Shutting down $DAEMON"
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# Get PID
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local pid=$(cat /var/run/$DAEMON/$DAEMON.pid)
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# Set TERM
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kill -SIGTERM "${pid}"
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# Wait for exit
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wait "${pid}"
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# All done.
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echo "Done."
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}
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echo "Running $@"
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if [ "$(basename $1)" == "$DAEMON" ]; then
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trap stop SIGINT SIGTERM
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$@ &
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pid="$!"
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mkdir -p /var/run/$DAEMON && echo "${pid}" > /var/run/$DAEMON/$DAEMON.pid
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wait "${pid}"
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exit $?
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else
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exec "$@"
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fi |