ci: add secret scanning for GitHub, Gitea, and local use

- .gitleaks.toml — extends gitleaks defaults with Pi-hole-specific rules
  for pwhash/totp_secret/app_pwhash; allowlists known-safe patterns
- .github/workflows/secret-scan.yml — GitHub Actions (full history scan)
- .gitea/workflows/secret-scan.yml — Gitea Actions (identical workflow)
- scripts/check-secrets.sh — shared runner used by both CI and local;
  supports --staged-only for pre-commit hook use; falls back to Docker
  if gitleaks isn't on PATH
- scripts/install-hooks.sh — installs pre-commit hook pointing at above
- pihole/sanitize-config.sh — redacts pwhash/totp_secret/app_pwhash
  in pihole.toml in-place before the file is committed
- pihole/pull-config.sh — updated to call sanitize-config.sh
  automatically after every pull so the repo stays clean by default

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XRzqNDrbnYR22ZgZj1Bg3s

.gitea/workflows/secret-scan.yml

@@ -0,0 +1,28 @@
+name: Secret Scan
+
+on:
+  push:
+    branches: ["**"]
+  pull_request:
+    branches: ["**"]
+
+jobs:
+  secret-scan:
+    name: Scan for secrets and sensitive config
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0   # full history for gitleaks git-log scan
+
+      - name: Install gitleaks
+        run: |
+          GITLEAKS_VERSION="8.21.2"
+          curl -sSL "https://github.com/gitleaks/gitleaks/releases/download/v${GITLEAKS_VERSION}/gitleaks_${GITLEAKS_VERSION}_linux_x64.tar.gz" \
+            | tar -xz -C /usr/local/bin gitleaks
+          gitleaks version
+
+      - name: Run secret scan
+        run: bash scripts/check-secrets.sh

.github/workflows/secret-scan.yml

@@ -0,0 +1,28 @@
+name: Secret Scan
+
+on:
+  push:
+    branches: ["**"]
+  pull_request:
+    branches: ["**"]
+
+jobs:
+  secret-scan:
+    name: Scan for secrets and sensitive config
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0   # full history for gitleaks git-log scan
+
+      - name: Install gitleaks
+        run: |
+          GITLEAKS_VERSION="8.21.2"
+          curl -sSL "https://github.com/gitleaks/gitleaks/releases/download/v${GITLEAKS_VERSION}/gitleaks_${GITLEAKS_VERSION}_linux_x64.tar.gz" \
+            | tar -xz -C /usr/local/bin gitleaks
+          gitleaks version
+
+      - name: Run secret scan
+        run: bash scripts/check-secrets.sh

.gitleaks.toml

@@ -0,0 +1,41 @@
+# Gitleaks configuration for debian-configuration repo.
+# Extends the default ruleset with Pi-hole-specific secret patterns.
+# https://github.com/gitleaks/gitleaks
+
+title = "debian-configuration secret scan"
+
+[extend]
+  useDefault = true
+
+# ── Custom rules ───────────────────────────────────────────────────────────────
+
+[[rules]]
+  id          = "pihole-pwhash"
+  description = "Pi-hole password hash (pihole.toml webserver.api.pwhash)"
+  regex       = '''pwhash\s*=\s*"[^"]{10,}"'''
+  tags        = ["pihole", "password"]
+
+[[rules]]
+  id          = "pihole-totp-secret"
+  description = "Pi-hole 2FA TOTP secret"
+  regex       = '''totp_secret\s*=\s*"[^"]{10,}"'''
+  tags        = ["pihole", "2fa"]
+
+[[rules]]
+  id          = "pihole-app-pwhash"
+  description = "Pi-hole app password hash"
+  regex       = '''app_pwhash\s*=\s*"[^"]{10,}"'''
+  tags        = ["pihole", "password"]
+
+# ── Allowlist ──────────────────────────────────────────────────────────────────
+
+[allowlist]
+  description = "Known-safe patterns in this repo"
+  regexes     = [
+    # TLS cert path reference — not the key itself
+    '''cert\s*=\s*"/etc/pihole/tls\.pem"''',
+  ]
+  paths       = [
+    # Example/template files are intentionally non-live
+    '''\.example$''',
+  ]

pihole/pull-config.sh

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
 # Pull Pi-hole configuration from a running instance to a local directory.
+# Sensitive fields (password hashes, TOTP secrets) are redacted automatically.
 #
 # Usage: pull-config.sh <source-host> <dest-dir>
 #   source-host  SSH-reachable hostname or IP of the source Pi-hole
@@ -7,10 +8,12 @@
 #
 # Example:
 #   ./pull-config.sh root@pihole ./config
-#   ./pull-config.sh root@192.168.2.100 /backup/pihole-$(date +%Y%m%d)
+#   ./pull-config.sh root@192.168.2.253 /backup/pihole-$(date +%Y%m%d)
 
 set -euo pipefail
 
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+
 usage() {
   echo "Usage: $(basename "$0") <source-host> <dest-dir>" >&2
   echo "  source-host  SSH target for the source Pi-hole (e.g. root@pihole)" >&2
@@ -30,6 +33,7 @@ mkdir -p "${DEST}/dnsmasq.d"
 # ── pihole.toml ────────────────────────────────────────────────────────────────
 echo "  pihole.toml"
 ssh "${SOURCE}" "cat /etc/pihole/pihole.toml" > "${DEST}/pihole.toml"
+"${SCRIPT_DIR}/sanitize-config.sh" "${DEST}/pihole.toml"
 
 # ── custom dnsmasq drop-ins ────────────────────────────────────────────────────
 # Pi-hole manages its own generated config; we only capture user-added files.

pihole/sanitize-config.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+# Redact sensitive fields from a Pi-hole pihole.toml before committing.
+# Called automatically by pull-config.sh; can also be run manually.
+#
+# Usage: sanitize-config.sh <pihole.toml>
+#   Edits the file in-place, replacing sensitive field values with "".
+
+set -euo pipefail
+
+usage() {
+  echo "Usage: $(basename "$0") <pihole.toml>" >&2
+  exit 1
+}
+
+[[ $# -eq 1 ]] || usage
+FILE="$1"
+[[ -f "$FILE" ]] || { echo "Error: file not found: $FILE" >&2; exit 1; }
+
+REDACTED=0
+
+redact_field() {
+  local field="$1"
+  # Match lines like:  pwhash = "some-value"  and blank the value
+  if grep -qE "^\s+${field}\s*=\s*\"[^\"]{1,}\"" "$FILE"; then
+    sed -i -E "s|^(\s+${field}\s*=\s*)\"[^\"]*\"|\1\"\"|" "$FILE"
+    echo "  redacted: ${field}"
+    REDACTED=$((REDACTED + 1))
+  fi
+}
+
+echo "Sanitizing $(basename "$FILE")..."
+redact_field "pwhash"
+redact_field "app_pwhash"
+redact_field "totp_secret"
+
+if [[ $REDACTED -eq 0 ]]; then
+  echo "  (nothing to redact)"
+else
+  echo "  ${REDACTED} field(s) redacted."
+fi

scripts/check-secrets.sh

@@ -0,0 +1,80 @@
+#!/usr/bin/env bash
+# Scan the repo for secrets and sensitive config values.
+# Runs via CI (GitHub/Gitea Actions) and locally as a pre-commit check.
+#
+# Usage: scripts/check-secrets.sh [--staged-only]
+#   --staged-only  Only check files staged for commit (for pre-commit hook use)
+#
+# Requires gitleaks on PATH, or falls back to Docker if available.
+# Install gitleaks: https://github.com/gitleaks/gitleaks#installing
+
+set -euo pipefail
+
+REPO_ROOT="$(git -C "$(dirname "$0")" rev-parse --show-toplevel)"
+STAGED_ONLY=false
+FAILURES=0
+
+for arg in "$@"; do
+  [[ "$arg" == "--staged-only" ]] && STAGED_ONLY=true
+done
+
+cd "$REPO_ROOT"
+
+# ── Resolve gitleaks binary ────────────────────────────────────────────────────
+if command -v gitleaks &>/dev/null; then
+  GITLEAKS="gitleaks"
+elif command -v docker &>/dev/null; then
+  GITLEAKS="docker run --rm -v ${REPO_ROOT}:/repo zricethezav/gitleaks:latest"
+  # Adjust paths for docker context
+  REPO_ROOT="/repo"
+else
+  echo "ERROR: gitleaks not found. Install it or ensure Docker is available." >&2
+  echo "  https://github.com/gitleaks/gitleaks#installing" >&2
+  exit 1
+fi
+
+echo "=== Secret scan ==="
+
+if [[ "$STAGED_ONLY" == "true" ]]; then
+  # Pre-commit mode: scan only staged content
+  echo "Mode: staged files only"
+  if ! $GITLEAKS protect --staged --config="${REPO_ROOT}/.gitleaks.toml" --source="${REPO_ROOT}" 2>&1; then
+    FAILURES=$((FAILURES + 1))
+  fi
+else
+  # CI mode: scan full git history
+  echo "Mode: full git history"
+  if ! $GITLEAKS detect --config="${REPO_ROOT}/.gitleaks.toml" --source="${REPO_ROOT}" 2>&1; then
+    FAILURES=$((FAILURES + 1))
+  fi
+fi
+
+# ── Pi-hole specific checks ────────────────────────────────────────────────────
+echo ""
+echo "=== Pi-hole config checks ==="
+
+PIHOLE_TOML="${REPO_ROOT}/pihole/config/pihole.toml"
+
+if [[ -f "$PIHOLE_TOML" ]]; then
+  # Check that known sensitive fields are empty
+  for field in pwhash totp_secret app_pwhash; do
+    value=$(grep -E "^\s+${field}\s*=" "$PIHOLE_TOML" | sed 's/.*=\s*"\(.*\)".*/\1/' | tr -d '[:space:]' || true)
+    if [[ -n "$value" && "$value" != '""' ]]; then
+      echo "FAIL: pihole.toml contains a non-empty '${field}' — run pihole/sanitize-config.sh before committing" >&2
+      FAILURES=$((FAILURES + 1))
+    else
+      echo "  OK: ${field} is empty"
+    fi
+  done
+else
+  echo "  (pihole/config/pihole.toml not present, skipping Pi-hole checks)"
+fi
+
+# ── Summary ────────────────────────────────────────────────────────────────────
+echo ""
+if [[ $FAILURES -gt 0 ]]; then
+  echo "FAILED: ${FAILURES} issue(s) found. Fix before committing." >&2
+  exit 1
+else
+  echo "All checks passed."
+fi

scripts/install-hooks.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+# Install git hooks that run the secret scan before every commit.
+# Run once after cloning: bash scripts/install-hooks.sh
+
+set -euo pipefail
+
+REPO_ROOT="$(git -C "$(dirname "$0")" rev-parse --show-toplevel)"
+HOOK="${REPO_ROOT}/.git/hooks/pre-commit"
+
+cat > "$HOOK" << 'HOOK'
+#!/usr/bin/env bash
+exec "$(git rev-parse --show-toplevel)/scripts/check-secrets.sh" --staged-only
+HOOK
+
+chmod +x "$HOOK"
+echo "Installed pre-commit hook → ${HOOK}"
+echo "The secret scan will run automatically before every commit."