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Enable gs-root-shell.service to automatically configure the secret #104

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Enable gs-root-shell.service to automatically configure the secret #104

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9601745
gs-init-secret: add new script
Flowdalic May 28, 2024
756a515
gs-root-shell.service: use gs-init-secret
Flowdalic May 28, 2024
5e72deb
gs-root-shell.service: drop Type=simple, as it is the default
Flowdalic May 28, 2024
9aa3a85
gs-root-shell.service: set RestartSteps=10 and cap restart delays at …
Flowdalic May 28, 2024
24eb0d5
gs-root-shell.service: configure service to await network-online.target
Flowdalic May 28, 2024
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9 changes: 6 additions & 3 deletions examples/systemd-root-shell/gs-root-shell.service
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Original file line number Diff line number Diff line change
@@ -1,13 +1,16 @@
[Unit]
Description=Global Socket Root Shell
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
Restart=always
RestartSec=10
RestartSteps=10
RestartMaxDelaySec=30m
WorkingDirectory=/root
ExecStart=gs-netcat -k /etc/systemd/gs-root-shell-key.txt -il
ExecStartPre=gs-init-secret /etc/gsocket/gs-root-shell-key
ExecStart=gs-netcat -k /etc/gsocket/gs-root-shell-key -il

[Install]
WantedBy=multi-user.target
2 changes: 1 addition & 1 deletion tools/Makefile.am
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Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,7 @@ gs_netcat_SOURCES = 4_gs-netcat.c utils.c socks.c console.c ids.c event_mgr.c pk
gs_netcat_LDADD = ../lib/libgsocket.a @LDADD_STATIC@
gs_netcat_CFLAGS = @CFLAGS_STATIC@

dist_bin_SCRIPTS = blitz gs-sftp gs-mount gsocket
dist_bin_SCRIPTS = blitz gs-sftp gs-mount gsocket gs-init-secret

gsocket_uchroot_dso_so_0_SOURCES = gsocket_uchroot_dso.c
gsocket_uchroot_dso_so_0_CFLAGS = -shared -fPIC
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33 changes: 33 additions & 0 deletions tools/gs-init-secret
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Original file line number Diff line number Diff line change
@@ -0,0 +1,33 @@
#!/usr/bin/env bash
set -eu

if [[ $# -eq 2 ]]; then
>&2 echo "ERROR: Must provide exactly one argument"
exit 1
fi

SECRET_FILE="${1}"

if [[ -f "${SECRET_FILE}" ]]; then
SECRET_FILE_PERMS="$(stat -c %a "${SECRET_FILE}")"
if [[ ${SECRET_FILE_PERMS} != [0-9][0-9]0 ]]; then
>&2 echo "ERROR: ${SECRET_FILE} has world-permissions set (${SECRET_FILE_PERMS})"
exit 1
fi

exit
fi

TARGET_DIR="$(dirname "${SECRET_FILE}")"
if [[ ! -d "${TARGET_DIR}" ]]; then
mkdir -p "${TARGET_DIR}"
fi

MY_TMPDIR=$(mktemp -d --tmpdir="${TMPDIR:-/tmp}")
trap 'rm -rf ${MY_TMPDIR}' EXIT

SECRET_FILE_TMP="${MY_TMPDIR}/secret"

gs-netcat -g > "${SECRET_FILE_TMP}"

install --mode=400 "${SECRET_FILE_TMP}" "${SECRET_FILE}"