Files
websitedev/scripts/security-scan.sh
T
Do Siki 8ee5befe10
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fix(security): real newlines in alert details for the ntfy body
The \n in the accumulated alert text was a literal backslash-n, so the
details would have rendered as one garbled line. printf -v now appends
real newlines; the notification body joins header + details with a real
line break.
2026-08-22 14:37:46 +02:00

87 lines
3.7 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 $LOG fájlba is kerülnek.
#
# Env felülírások:
# SECURITY_SCAN_LOG — log fájl útvonala
# SECURITY_SCAN_CPU_THRESHOLD — CPU% határ (alap 200)
# SECURITY_SCAN_NTFY_TOPIC — ntfy topic (alap st_security)
# SECURITY_SCAN_NTFY_CRED — ntfy credential fájl (alap /etc/ntfy/credentials/auth.env)
set -uo pipefail
LOG="${SECURITY_SCAN_LOG:-/home/sadmin/websitedev/security-scan.log}"
CPU_THRESHOLD="${SECURITY_SCAN_CPU_THRESHOLD:-200}"
NTFY_TOPIC="${SECURITY_SCAN_NTFY_TOPIC:-st_limidev_security}"
NTFY_CRED="${SECURITY_SCAN_NTFY_CRED:-/etc/ntfy/credentials/auth.env}"
NTFY_URL="${SECURITY_SCAN_NTFY_URL:-http://127.0.0.1:2586}"
FINDINGS=0
ALERTS=""
alert() {
printf '[%s] %s\n' "$(date '+%F %T')" "$*" | tee -a "$LOG" >&2
printf -v ALERTS '%s%s\n' "$ALERTS" "$*"
FINDINGS=$((FINDINGS + 1))
}
# ntfy push — a helyi ntfy szerverre (127.0.0.1:2586), az si_17t_pro user
# tokenjével (a credential fájlból, sosem kerül kimenetre). A body a konkrét
# találatokat is tartalmazza, ne csak egy számlálót.
notify() {
[ -f "$NTFY_CRED" ] || return 0
local token
token="$(grep '^NTFY_SI_TOKEN=' "$NTFY_CRED" 2>/dev/null | cut -d= -f2- | tr -d '"' | tr -d '[:space:]')"
[ -n "$token" ] || return 0
local body
body="🛡 mozdIT monitoring: ${FINDINGS} eltérés — $(date '+%F %T')"$'\n'"${ALERTS}"
curl -s -o /dev/null --max-time 10 \
-H "Authorization: Bearer $token" \
-H "Title: mozdIT biztonsági riasztás" \
-H "Priority: high" \
-d "$body" \
"$NTFY_URL/$NTFY_TOPIC" || true
}
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>&1 | grep -vE 'cannot exec|is not running|No such container|Error response' || 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"
if [ "$FINDINGS" -gt 0 ]; then
notify
exit 1
fi
exit 0