mirror of
https://github.com/blakeblackshear/frigate.git
synced 2026-10-01 12:26:50 +03:00
Josh Hawkins
46c189fced
/config is owned by the unprivileged runtime user after the ownership sweep, so root operations on files there could be redirected by a planted symlink. - go2rtc HomeKit setup: replace the root yq/jq normalization and chown with an O_NOFOLLOW helper (prepare_homekit.py), so a symlink at go2rtc_homekit.yml can't redirect a root write or chown onto another file - go2rtc binary override: ignore /config/go2rtc whenever the service runs as root, so a planted binary can't exec as root under FRIGATE_ROOT_SERVICES - sweep sentinel: read and write it through safe-sentinel, which trusts only a root-owned regular file and never follows a symlink, so it can't be forged to skip the migration or symlinked to clobber a root file - ownership sweep: chown with -execdir so a parent directory swapped for a symlink mid-walk can't redirect the chown out of the volume - validate inputs: restrict DEVICE_ACL_PATHS to /dev, require nonzero numeric EXTRA_GROUPS, and reject PUID/PGID that collide with the go2rtc ids - docs: correct the TLS key ownership note to match what actually happens
96 lines
3.6 KiB
Plaintext
Executable File
96 lines
3.6 KiB
Plaintext
Executable File
#!/command/with-contenv bash
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# shellcheck shell=bash
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# Remap the frigate user to PUID/PGID and register EXTRA_GROUPS.
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# No-op when: started with --user (euid != 0), FRIGATE_RUN_AS_ROOT=true,
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# or PUID/PGID already match. FRIGATE_ROOT_SERVICES is validated here too.
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set -o errexit -o nounset -o pipefail
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if [[ "$(id -u)" -ne 0 ]]; then
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# Started with docker --user; the host owns UID mapping entirely.
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exit 0
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fi
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if [[ "${FRIGATE_RUN_AS_ROOT:-false}" == "true" ]]; then
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if [[ -n "${FRIGATE_ROOT_SERVICES:-}" ]]; then
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echo "[INFO] FRIGATE_RUN_AS_ROOT=true: ignoring FRIGATE_ROOT_SERVICES"
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fi
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echo "[INFO] FRIGATE_RUN_AS_ROOT=true: skipping user remapping"
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exit 0
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fi
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# a typo must fail the boot, not silently drop a service to non-root
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if [[ -n "${FRIGATE_ROOT_SERVICES:-}" ]]; then
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IFS=',' read -ra root_services <<< "${FRIGATE_ROOT_SERVICES}"
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for entry in "${root_services[@]}"; do
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entry="${entry//[[:space:]]/}"
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if [[ -z "$entry" ]]; then
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continue
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fi
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case "$entry" in
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frigate|go2rtc|nginx) ;;
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*)
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echo "[ERROR] FRIGATE_ROOT_SERVICES contains unknown service '${entry}'; valid names are frigate, go2rtc, nginx" >&2
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exit 1
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;;
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esac
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done
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fi
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puid="${PUID:-1000}"
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pgid="${PGID:-1000}"
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if ! [[ "$puid" =~ ^[0-9]+$ && "$pgid" =~ ^[0-9]+$ ]]; then
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echo "[ERROR] PUID and PGID must be numeric, got '${puid}' and '${pgid}'" >&2
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exit 1
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fi
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# Remapping to 0 would make the frigate user root, so every service would keep
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# full privilege while reporting a successful migration.
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if [[ "$puid" -eq 0 || "$pgid" -eq 0 ]]; then
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echo "[ERROR] PUID/PGID 0 would run the services as root and defeat the privilege separation." >&2
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echo "[ERROR] Set FRIGATE_RUN_AS_ROOT=true if you want to keep running as root." >&2
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exit 1
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fi
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# Colliding with the go2rtc ids would merge the two users and collapse the
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# separation between the main process and the network-facing restreamer.
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go2rtc_uid="$(id -u go2rtc)"
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go2rtc_gid="$(id -g go2rtc)"
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if [[ "$puid" -eq "$go2rtc_uid" || "$pgid" -eq "$go2rtc_gid" ]]; then
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echo "[ERROR] PUID/PGID must not equal the go2rtc service ids (${go2rtc_uid}:${go2rtc_gid})." >&2
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exit 1
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fi
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current_uid="$(id -u frigate)"
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current_gid="$(id -g frigate)"
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if [[ "$puid" != "$current_uid" || "$pgid" != "$current_gid" ]]; then
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if [[ ! -w /etc/passwd ]]; then
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echo "[ERROR] PUID/PGID remapping needs a writable /etc and is not compatible with read_only: true." >&2
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echo "[ERROR] Either remove read_only and keep PUID, or drop PUID/PGID and use docker's user: ${puid}:${pgid} instead." >&2
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echo "[ERROR] See https://docs.frigate.video/configuration/non_root for the compatibility matrix." >&2
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exit 1
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fi
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echo "[INFO] Remapping frigate user to ${puid}:${pgid}"
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groupmod -o -g "$pgid" frigate
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usermod -o -u "$puid" frigate
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fi
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# EXTRA_GROUPS: numeric host GIDs granting device access (e.g. host render/video)
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if [[ -n "${EXTRA_GROUPS:-}" ]]; then
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for gid in ${EXTRA_GROUPS//,/ }; do
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if ! [[ "$gid" =~ ^[0-9]+$ ]] || [[ "$gid" -eq 0 ]]; then
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echo "[ERROR] EXTRA_GROUPS must be nonzero numeric GIDs, got '${gid}'" >&2
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exit 1
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fi
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if ! getent group "$gid" >/dev/null; then
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groupadd -o -g "$gid" "frigate-extra-${gid}"
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fi
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group_name="$(getent group "$gid" | cut -d: -f1)"
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usermod -aG "$group_name" frigate
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usermod -aG "$group_name" go2rtc
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echo "[INFO] Added frigate and go2rtc to supplementary group ${group_name} (gid ${gid})"
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done
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fi
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