169 lines
6.6 KiB
Bash
Executable File
169 lines
6.6 KiB
Bash
Executable File
#!/usr/bin/env bash
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# capture-dsh-token.sh — refresh the dsh-web login token WITHOUT restarting dsh-web.
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#
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# Context (CT 112 / tankodhs.sysloggh.net)
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# ----------------------------------------
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# The dsh-web UI (systemd unit `dsh-web.service`, 127.0.0.1:3080) prints a random
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# launch token to the journal on every start:
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#
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# dsh web: http://127.0.0.1:3080/?token=<TOKEN>
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#
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# That token is the only way to bootstrap the authority-bound 30-day browser
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# cookie. It rotates on every dsh-web start, so the Authentik-gated
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# `location = /dsh-web-login` in /etc/nginx/sites-available/dsh must always
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# reference the token of the RUNNING process.
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#
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# This script:
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# 1. reads the LATEST launch token from the running service's journal — it
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# NEVER stops or starts dsh-web,
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# 2. records it in /etc/dsh-web/launch-token,
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# 3. regenerates the nginx include /etc/dsh-web/nginx-login.conf (the
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# `proxy_pass ...?token=` line consumed by /dsh-web-login),
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# 4. reloads nginx ONLY when the token differs from the token nginx actually
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# loaded (tracked in an applied-state stamp written only after a successful
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# reload), rolling the include back on failure so the next run retries,
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# 5. removes the legacy unauthenticated :8081 endpoint if it ever reappears.
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#
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# Idempotent and safe to run at any time (systemd ExecStartPost or timer).
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set -euo pipefail
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umask 077
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PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
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JOURNAL_UNIT="dsh-web.service"
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TOKEN_FILE="/etc/dsh-web/launch-token"
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INCLUDE_FILE="/etc/dsh-web/nginx-login.conf"
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STAMP_FILE="/etc/dsh-web/nginx-login.conf.applied"
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SITE_ENABLED="/etc/nginx/sites-enabled/dsh"
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LEGACY_8081="/etc/nginx/sites-enabled/dsh.token"
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STASH_DIR="/etc/nginx/sites-available"
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log() { printf 'capture-dsh-token: %s\n' "$*" >&2; }
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die() { printf 'capture-dsh-token: ERROR: %s\n' "$*" >&2; exit 1; }
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[ "$(id -u)" -eq 0 ] || die "must run as root"
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# ── 0. Remove the legacy unauthenticated :8081 endpoint, if present ─────────
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# It bypassed Authentik entirely (listened on 0.0.0.0:8081 with no auth_request)
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# and must never come back. Stash it rather than delete so it is auditable.
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if [ -e "$LEGACY_8081" ] || [ -L "$LEGACY_8081" ]; then
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TS="$(date -u +%Y%m%dT%H%M%SZ)"
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STASHED="$STASH_DIR/dsh.token.disabled-$TS"
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mv "$LEGACY_8081" "$STASHED"
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if ! nginx -t >/dev/null 2>&1; then
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die "nginx config test failed after disabling $LEGACY_8081 (kept disabled at $STASHED). Fix the nginx config and rerun; the legacy :8081 endpoint will NOT be restored."
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fi
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if ! nginx -s reload; then
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die "nginx reload failed after disabling $LEGACY_8081 (kept disabled at $STASHED). Fix nginx and rerun; the legacy :8081 endpoint will NOT be restored."
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fi
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log "removed legacy :8081 endpoint -> $STASHED"
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fi
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# ── 1. Read the latest launch token from the RUNNING service ────────────────
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# Scope the journal to the service's CURRENT invocation. While a restarted
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# process is still booting (~25s before it prints the banner), the newest token
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# in the journal still belongs to the PREVIOUS process; without this filter an
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# ExecStartPost run would silently keep the stale token. Never stop/start dsh-web.
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INVOCATION="$(systemctl show -p InvocationID --value "$JOURNAL_UNIT" 2>/dev/null || true)"
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JOURNAL_ARGS=(-u "$JOURNAL_UNIT")
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if [ -n "$INVOCATION" ] && [ "$INVOCATION" != "n/a" ]; then
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JOURNAL_ARGS+=("_SYSTEMD_INVOCATION_ID=$INVOCATION")
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else
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log "WARNING: no invocation id for $JOURNAL_UNIT; using latest journal token"
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fi
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extract_token() {
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grep -oE 'dsh web: https?://[^[:space:]]+[?&]token=[^[:space:]]+' \
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| tail -n1 | sed -E 's/.*[?&]token=//' || true
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}
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TOKEN=""
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for _ in $(seq 1 60); do
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TOKEN="$(journalctl "${JOURNAL_ARGS[@]}" --no-pager -o cat 2>/dev/null | extract_token)"
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[ -n "$TOKEN" ] && break
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sleep 1
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done
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# Fallback: the current invocation's start banner may have been rotated out of
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# the journal; the newest matching line overall is then the best available.
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if [ -z "$TOKEN" ]; then
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log "WARNING: no token for the current invocation; falling back to newest journal token"
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TOKEN="$(journalctl -u "$JOURNAL_UNIT" --no-pager -o cat 2>/dev/null | extract_token)"
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fi
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[ -n "$TOKEN" ] || die "no launch token found in the $JOURNAL_UNIT journal"
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# The token must be safe to embed in a URI and in the nginx config.
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printf '%s' "$TOKEN" | grep -qE '^[A-Za-z0-9._~+/=:@-]+$' \
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|| die "captured token contains unsupported characters"
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# ── 2. Record the token (atomic, private) ──────────────────────────────────
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mkdir -p "$(dirname "$TOKEN_FILE")"
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if ! printf '%s\n' "$TOKEN" | cmp -s - "$TOKEN_FILE" 2>/dev/null; then
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printf '%s\n' "$TOKEN" > "$TOKEN_FILE.tmp"
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chmod 600 "$TOKEN_FILE.tmp"
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mv "$TOKEN_FILE.tmp" "$TOKEN_FILE"
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log "recorded new launch token in $TOKEN_FILE"
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fi
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# ── 3. Regenerate the nginx login include (reload only when it changes) ────
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NEW_INCLUDE="$(mktemp "$INCLUDE_FILE.XXXXXX")"
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printf 'proxy_pass http://127.0.0.1:3080/?token=%s;\n' "$TOKEN" > "$NEW_INCLUDE"
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chmod 600 "$NEW_INCLUDE"
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# The stamp records the token nginx actually loaded. Comparing against it (not
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# the on-disk include) means a failed or interrupted reload is retried on the
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# next run instead of being mistaken for success.
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APPLIED=""
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[ -f "$STAMP_FILE" ] && APPLIED="$(cat "$STAMP_FILE" 2>/dev/null || true)"
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if [ "$APPLIED" = "$TOKEN" ]; then
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if [ -f "$INCLUDE_FILE" ] && cmp -s "$NEW_INCLUDE" "$INCLUDE_FILE"; then
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rm -f "$NEW_INCLUDE"
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log "token unchanged; nginx not reloaded"
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exit 0
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fi
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mv "$NEW_INCLUDE" "$INCLUDE_FILE"
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chmod 600 "$INCLUDE_FILE"
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log "include file repaired to match the token nginx already serves"
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exit 0
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fi
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[ -e "$SITE_ENABLED" ] || { rm -f "$NEW_INCLUDE"; die "$SITE_ENABLED missing; refusing to reload"; }
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RESTORE=""
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if [ -f "$INCLUDE_FILE" ]; then
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RESTORE="$(mktemp "$INCLUDE_FILE.bak.XXXXXX")"
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cp -p "$INCLUDE_FILE" "$RESTORE"
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fi
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mv "$NEW_INCLUDE" "$INCLUDE_FILE"
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chmod 600 "$INCLUDE_FILE"
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if ! nginx -t >/dev/null 2>&1; then
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if [ -n "$RESTORE" ]; then
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mv "$RESTORE" "$INCLUDE_FILE"
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else
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rm -f "$INCLUDE_FILE"
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fi
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die "nginx config test failed; previous include restored"
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fi
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if ! nginx -s reload; then
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if [ -n "$RESTORE" ]; then
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mv "$RESTORE" "$INCLUDE_FILE"
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else
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rm -f "$INCLUDE_FILE"
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fi
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die "nginx reload failed; previous include restored; will retry next run"
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fi
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if [ -n "$RESTORE" ]; then
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rm -f "$RESTORE"
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fi
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printf '%s\n' "$TOKEN" > "$STAMP_FILE.tmp"
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chmod 600 "$STAMP_FILE.tmp"
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mv "$STAMP_FILE.tmp" "$STAMP_FILE"
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log "token changed; nginx reloaded"
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log "login endpoint: https://tankodhs.sysloggh.net/dsh-web-login (Authentik-gated)"
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