Files
websitedev/scripts/security-scan.sh
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Do Siki 28778aef88
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feat(security): lightweight cryptominer/backdoor detection script
Periodic host+container sweep for the exact indicators seen in the staging
miner incident: decoy process names (redis-server/kworkerd/xmrig/ssl_client/
init.sh), /tmp/.kworkerd and .redis-server.pid artifacts, and high-CPU
containers. Findings are logged and exit 1 for cron MAILTO alerting.

Closes MITHOME-82
2026-08-22 13:39:46 +02:00

59 lines
2.5 KiB
Bash
Executable File

#!/usr/bin/env bash
# Biztonsági monitoring (könnyűsúlyú): kriptominer / backdoor indikátorok
# detektálása a Docker hoszton és a konténerekben.
#
# Cronnal futtatandó (pl. */5 * * * *). Találat esetén exit 1 (a cron MAILTO
# riasztáshoz használhatja) és a sorok a $LOG fájlba is kerülnek.
#
# Env felülírások:
# SECURITY_SCAN_LOG — log fájl útvonala
# SECURITY_SCAN_CPU_THRESHOLD — CPU% határ (alap 200)
set -uo pipefail
LOG="${SECURITY_SCAN_LOG:-/home/sadmin/websitedev/security-scan.log}"
CPU_THRESHOLD="${SECURITY_SCAN_CPU_THRESHOLD:-200}"
FINDINGS=0
alert() {
printf '[%s] %s\n' "$(date '+%F %T')" "$*" | tee -a "$LOG" >&2
FINDINGS=$((FINDINGS + 1))
}
printf '[%s] scan start\n' "$(date '+%F %T')" >> "$LOG"
# 1) Hoszt: álcázott / ismert miner folyamatnevek
HOST_HITS="$(ps -eo comm 2>/dev/null | grep -iE 'kworkerd|xmrig|minerd|kdevtmpfsi|ssl_client|\.redis-server' | grep -v grep || true)"
[ -n "$HOST_HITS" ] && alert "HOST decoy processes: $(printf '%s ' $HOST_HITS)"
# 2) Konténerenként: decoy folyamatok + miner-maradványok a /tmp-ben
for cid in $(docker ps -q 2>/dev/null); do
name="$(docker inspect --format '{{.Name}}' "$cid" 2>/dev/null | sed 's|^/||')"
[ -n "$name" ] || continue
# A legitim redis-konténereket kihagyjuk (pl. plane-plane-redis-1).
decoys=""
if [[ "$name" != *redis* ]]; then
decoys="$(docker top "$cid" 2>/dev/null | tail -n +2 | grep -iE 'redis-server|kworkerd|xmrig|minerd|kdevtmpfsi|ssl_client|init\.sh|\.redis-server' | grep -v grep || true)"
else
decoys="$(docker top "$cid" 2>/dev/null | tail -n +2 | grep -iE 'kworkerd|xmrig|minerd|kdevtmpfsi|ssl_client|init\.sh' | grep -v grep || true)"
fi
[ -n "$decoys" ] && alert "container $name decoy: $(printf '%s' "$decoys" | tr '\n' ' ')"
arts="$(docker exec "$cid" sh -c 'ls /tmp/.kworkerd /tmp/.redis-server.pid 2>/dev/null' 2>/dev/null || true)"
[ -n "$arts" ] && alert "container $name /tmp artifacts: $(printf '%s ' $arts)"
done
# 3) Magas CPU-jú konténerek (figyelmeztetés)
HIGH_CPU="$(docker stats --no-stream --format '{{.Name}} {{.CPUPerc}}' 2>/dev/null \
| awk -v t="$CPU_THRESHOLD" '{ sub(/%/,"",$2); if ($2+0 > t) printf "%s %.0f%% ", $1, $2 }' || true)"
[ -n "$HIGH_CPU" ] && alert "high CPU: $HIGH_CPU"
# 4) Hoszt /tmp maradványok
HOST_ARTS="$(ls /tmp/.kworkerd /tmp/.redis-server.pid 2>/dev/null || true)"
[ -n "$HOST_ARTS" ] && alert "HOST /tmp artifacts: $(printf '%s ' $HOST_ARTS)"
printf '[%s] scan end (findings=%d)\n' "$(date '+%F %T')" "$FINDINGS" >> "$LOG"
[ "$FINDINGS" -eq 0 ] && exit 0
exit 1