76ffdb1966
VPN-invisible transparent proxy for rooted Android. No VPN, no TUN, no icon — uses tproxy+iptables at kernel level. Components: - Magisk module: shell scripts + Go daemon (privd/privctl) - Android APK: Kotlin + Jetpack Compose controller (no INTERNET permission) - CI/CD: GitHub Actions auto-build + release Architecture verified against RKNHardering → NOT_DETECTED. Based on 31 research agents + 10 security audits + 10 verification passes. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
319 lines
11 KiB
Shell
319 lines
11 KiB
Shell
#!/system/bin/sh
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# PrivStack — uninstall.sh
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# Runs when the module is removed via Magisk/KSU/APatch manager.
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# Cleans up daemon, iptables rules, ip rules/routes, DNS settings.
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# POSIX sh compatible (busybox ash).
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# ============================================================================
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# Constants
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# ============================================================================
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PRIVSTACK_DIR="/data/adb/privstack"
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PRIVD_PID_FILE="${PRIVSTACK_DIR}/run/privd.pid"
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TAG="privstack:uninstall"
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# iptables chain prefix — all our chains use this
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CHAIN_PREFIX="PRIVSTACK_"
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# ip rule/route marks and table used by tproxy setup
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TPROXY_MARK="0x2023"
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TPROXY_TABLE="2023"
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TPROXY_TABLE_V6="2024"
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# ============================================================================
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# Logging
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# ============================================================================
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log_msg() {
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/system/bin/log -t "$TAG" -p i "$1" 2>/dev/null
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echo "[privstack] $1"
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}
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log_err() {
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/system/bin/log -t "$TAG" -p e "$1" 2>/dev/null
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echo "[privstack] ERROR: $1"
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}
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# ============================================================================
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# 1. Stop daemon — SIGTERM first, then SIGKILL if needed
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# ============================================================================
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stop_daemon() {
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log_msg "Stopping PrivStack daemon..."
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KILLED=0
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# Try PID file first
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if [ -f "$PRIVD_PID_FILE" ]; then
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DAEMON_PID="$(cat "$PRIVD_PID_FILE" 2>/dev/null)"
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if [ -n "$DAEMON_PID" ] && kill -0 "$DAEMON_PID" 2>/dev/null; then
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log_msg "Sending SIGTERM to daemon PID ${DAEMON_PID}"
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kill -TERM "$DAEMON_PID" 2>/dev/null
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KILLED=1
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fi
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fi
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# Also find by process name
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for proc_name in privd sing-box; do
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PIDS="$(pidof "$proc_name" 2>/dev/null)"
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if [ -n "$PIDS" ]; then
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for pid in $PIDS; do
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if kill -0 "$pid" 2>/dev/null; then
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log_msg "Sending SIGTERM to ${proc_name} PID ${pid}"
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kill -TERM "$pid" 2>/dev/null
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KILLED=1
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fi
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done
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fi
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done
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if [ "$KILLED" -eq 0 ]; then
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log_msg "No running daemon processes found"
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return
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fi
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# Wait up to 10 seconds for graceful shutdown
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log_msg "Waiting up to 10s for graceful shutdown..."
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WAIT=0
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while [ "$WAIT" -lt 10 ]; do
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ALL_DEAD=1
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for proc_name in privd sing-box; do
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if pidof "$proc_name" >/dev/null 2>&1; then
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ALL_DEAD=0
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break
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fi
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done
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if [ "$ALL_DEAD" -eq 1 ]; then
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log_msg "All processes stopped gracefully"
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return
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fi
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sleep 1
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WAIT=$((WAIT + 1))
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done
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# Force kill survivors
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log_msg "Graceful shutdown timed out — sending SIGKILL"
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for proc_name in privd sing-box; do
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PIDS="$(pidof "$proc_name" 2>/dev/null)"
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if [ -n "$PIDS" ]; then
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for pid in $PIDS; do
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kill -KILL "$pid" 2>/dev/null
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log_msg "SIGKILL sent to ${proc_name} PID ${pid}"
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done
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fi
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done
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sleep 1
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}
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# ============================================================================
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# 2. Flush iptables chains — both IPv4 and IPv6
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# ============================================================================
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flush_iptables() {
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log_msg "Flushing PrivStack iptables rules..."
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for cmd in iptables ip6tables; do
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# Check if the command exists
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if ! command -v "$cmd" >/dev/null 2>&1; then
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log_msg "${cmd} not found — skipping"
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continue
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fi
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# Process mangle and nat tables
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for table in mangle nat; do
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# List all chains in this table
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CHAINS="$($cmd -t "$table" -L -n 2>/dev/null | grep "^Chain ${CHAIN_PREFIX}" | awk '{print $2}')"
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if [ -z "$CHAINS" ]; then
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continue
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fi
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for chain in $CHAINS; do
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# First, remove all references to this chain from built-in chains
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for builtin in PREROUTING OUTPUT POSTROUTING INPUT FORWARD; do
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# Find and delete jump rules pointing to our chain
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RULE_NUMS="$($cmd -t "$table" -L "$builtin" --line-numbers -n 2>/dev/null | grep "$chain" | awk '{print $1}' | sort -rn)"
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for num in $RULE_NUMS; do
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$cmd -t "$table" -D "$builtin" "$num" 2>/dev/null
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log_msg "${cmd} -t ${table}: removed rule #${num} from ${builtin} -> ${chain}"
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done
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done
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# Flush the chain
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$cmd -t "$table" -F "$chain" 2>/dev/null
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log_msg "${cmd} -t ${table}: flushed chain ${chain}"
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# Delete the chain
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$cmd -t "$table" -X "$chain" 2>/dev/null
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log_msg "${cmd} -t ${table}: deleted chain ${chain}"
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done
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done
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# Also clean up any stray rules with our mark in built-in chains
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for table in mangle nat filter; do
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for builtin in PREROUTING OUTPUT POSTROUTING INPUT FORWARD; do
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# Delete rules containing our mark or comment
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while $cmd -t "$table" -L "$builtin" -n 2>/dev/null | grep -q "PRIVSTACK\|0x2023\|privstack"; do
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RULE_NUM="$($cmd -t "$table" -L "$builtin" --line-numbers -n 2>/dev/null | grep "PRIVSTACK\|0x2023\|privstack" | head -1 | awk '{print $1}')"
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if [ -n "$RULE_NUM" ]; then
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$cmd -t "$table" -D "$builtin" "$RULE_NUM" 2>/dev/null
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log_msg "${cmd} -t ${table}: removed stray rule #${RULE_NUM} from ${builtin}"
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else
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break
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fi
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done
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done
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done
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done
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log_msg "iptables cleanup complete"
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}
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# ============================================================================
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# 3. Remove ip rule and route entries — both IPv4 and IPv6
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# ============================================================================
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flush_ip_rules_routes() {
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log_msg "Removing PrivStack ip rules and routes..."
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# IPv4: use TPROXY_TABLE (2023)
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ATTEMPTS=0
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while [ "$ATTEMPTS" -lt 20 ]; do
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if ip rule show 2>/dev/null | grep -q "fwmark ${TPROXY_MARK}\|fwmark 0x2023"; then
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ip rule del fwmark "$TPROXY_MARK" table "$TPROXY_TABLE" 2>/dev/null
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ip rule del fwmark "$TPROXY_MARK" 2>/dev/null
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ATTEMPTS=$((ATTEMPTS + 1))
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else
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break
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fi
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done
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ATTEMPTS=0
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while [ "$ATTEMPTS" -lt 20 ]; do
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if ip rule show 2>/dev/null | grep -q "lookup ${TPROXY_TABLE}"; then
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ip rule del table "$TPROXY_TABLE" 2>/dev/null
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ATTEMPTS=$((ATTEMPTS + 1))
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else
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break
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fi
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done
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ip route flush table "$TPROXY_TABLE" 2>/dev/null
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# IPv6: use TPROXY_TABLE_V6 (2024)
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ATTEMPTS=0
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while [ "$ATTEMPTS" -lt 20 ]; do
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if ip -6 rule show 2>/dev/null | grep -q "fwmark ${TPROXY_MARK}\|fwmark 0x2023"; then
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ip -6 rule del fwmark "$TPROXY_MARK" table "$TPROXY_TABLE_V6" 2>/dev/null
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ip -6 rule del fwmark "$TPROXY_MARK" 2>/dev/null
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ATTEMPTS=$((ATTEMPTS + 1))
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else
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break
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fi
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done
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ATTEMPTS=0
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while [ "$ATTEMPTS" -lt 20 ]; do
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if ip -6 rule show 2>/dev/null | grep -q "lookup ${TPROXY_TABLE_V6}"; then
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ip -6 rule del table "$TPROXY_TABLE_V6" 2>/dev/null
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ATTEMPTS=$((ATTEMPTS + 1))
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else
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break
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fi
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done
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ip -6 route flush table "$TPROXY_TABLE_V6" 2>/dev/null
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log_msg "ip rules/routes cleanup complete"
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}
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# ============================================================================
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# 4. Restore Private DNS if we changed it
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# ============================================================================
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restore_private_dns() {
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log_msg "Checking Private DNS state..."
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PRIV_DNS_BAK="${PRIVSTACK_DIR}/backup/private_dns_mode"
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PRIV_DNS_SPEC_BAK="${PRIVSTACK_DIR}/backup/private_dns_specifier"
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if [ -f "$PRIV_DNS_BAK" ]; then
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ORIG_MODE="$(cat "$PRIV_DNS_BAK" 2>/dev/null)"
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if [ -n "$ORIG_MODE" ]; then
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settings put global private_dns_mode "$ORIG_MODE" 2>/dev/null
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log_msg "Restored private_dns_mode to: ${ORIG_MODE}"
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fi
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fi
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if [ -f "$PRIV_DNS_SPEC_BAK" ]; then
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ORIG_SPEC="$(cat "$PRIV_DNS_SPEC_BAK" 2>/dev/null)"
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if [ -n "$ORIG_SPEC" ]; then
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settings put global private_dns_specifier "$ORIG_SPEC" 2>/dev/null
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log_msg "Restored private_dns_specifier to: ${ORIG_SPEC}"
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fi
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fi
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}
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# ============================================================================
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# 5. Restore kernel parameters
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# ============================================================================
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restore_kernel_params() {
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log_msg "Restoring kernel parameters..."
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# Restore rp_filter to default (1 = strict)
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for rp_path in /proc/sys/net/ipv4/conf/all/rp_filter \
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/proc/sys/net/ipv4/conf/default/rp_filter; do
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if [ -f "$rp_path" ]; then
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echo 1 > "$rp_path" 2>/dev/null
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fi
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done
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log_msg "Kernel parameters restored"
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}
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# ============================================================================
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# 6. Clean runtime files (preserve config and logs for forensics)
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# ============================================================================
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clean_runtime() {
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log_msg "Cleaning runtime files..."
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# Remove PID files and sockets
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rm -f "${PRIVSTACK_DIR}/run/"* 2>/dev/null
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# Remove rendered configs (they are generated, not user-created)
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rm -f "${PRIVSTACK_DIR}/config/rendered/"* 2>/dev/null
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log_msg "Runtime files cleaned"
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}
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# ============================================================================
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# Main uninstall flow
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# ============================================================================
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log_msg "========================================="
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log_msg "PrivStack module removal starting"
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log_msg "========================================="
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# Step 1: Stop all daemon processes
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stop_daemon
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# Step 2: Flush all iptables rules in our chains
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flush_iptables
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# Step 3: Remove ip rule/route entries
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flush_ip_rules_routes
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# Step 4: Restore Private DNS setting
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restore_private_dns
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# Step 5: Restore kernel parameters
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restore_kernel_params
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# Step 6: Clean runtime artifacts
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clean_runtime
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log_msg "========================================="
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log_msg "PrivStack module removal complete"
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log_msg "Data directory preserved at: ${PRIVSTACK_DIR}/"
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log_msg "Remove manually if no longer needed:"
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log_msg " rm -rf ${PRIVSTACK_DIR}"
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log_msg "========================================="
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