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https://codeberg.org/PostERG/xamxam.git
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Add sso-diagnose.sh: verify all peertube-sso-incident claims into a log
- docs: record the open identity-forwarding question, auth contracts, and responsibility boundary
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Pontoporeia
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#!/usr/bin/env bash
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# =============================================================================
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# sso-diagnose.sh — verify every claim in docs/peertube-sso-incident.md
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#
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# Checks the topology + auth behaviour end-to-end and appends a timestamped,
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# machine-parseable block to a log for later analysis. NO secret is written to
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# the log or stdout: SMTP AUTH is tested (proves the credential is still valid)
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# but the password is never echoed, and any PeerTube token/secret is redacted.
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#
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# What it verifies (mirrors the incident report):
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# 1. DNS + reverse-DNS + HTTP identity of the three hosts
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# (videos.erg.be, mail.erg.school, portail.erg.school)
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# 2. The SSO IdP = LemonLDAP::NG OIDC, and its discovery document
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# (grant/response types — no `password`, no `client_credentials`)
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# 3. PeerTube's OAuth clients (the built-in `local` client) and the
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# `password` grant result (`invalid_grant` expected)
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# 4. SMTP STARTTLS AUTH mechanisms (XOAUTH2/OAUTHBEARER vs PLAIN/LOGIN)
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# 5. PreserveHost / identity-header propagation between the proxy and backend
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# (REMOTE_USER / X-Remote-User / X-Forwarded-User / Auth-User headers)
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# — response-side + an optional request-side echo probe (--echo <url>) that
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# uses scripts/echo-headers.php to reveal headers the SSO proxy injects.
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#
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# Usage:
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# scripts/sso-diagnose.sh [--instance <url>] [--idp <url>] [--smtp <host:port>]
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# [--mail-host <host>] [--db <path>] [--log <path>]
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# [--echo <url>]
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#
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# Exit 0 always (a diagnostic records results); individual findings carry
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# PASS/FAIL/INFO in the log so analysis is unambiguous.
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#
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# NOTE: SMTP creds + password come from the xamxam DB ONLY if creds-probe.php
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# exists and can run; the plaintext password is NEVER printed — only the fact
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# that AUTH succeeded/failed. If you want PeerTube's password-grant probe to run
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# you must run `just creds-test` (it needs the password to make the request).
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# =============================================================================
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set -uo pipefail
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
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# ── defaults ───────────────────────────────────────────────────────────────────
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INSTANCE="${INSTANCE:-https://videos.erg.be}"
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IDP_HOST="${IDP_HOST:-portail.erg.school}"
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SMTP_HOST="${SMTP_HOST:-mail.erg.school}"
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SMTP_PORT="${SMTP_PORT:-587}"
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DB_PATH="${DB_PATH:-$REPO_ROOT/app/storage/xamxam.db}"
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LOG="${LOG:-$REPO_ROOT/sso-diagnose.log}"
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while [[ $# -gt 0 ]]; do
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case "$1" in
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--instance) INSTANCE="$2"; shift 2 ;;
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--idp) IDP_HOST="$2"; shift 2 ;;
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--smtp) SMTP_HOST="$2"; shift 2 ;;
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--mail-host) SMTP_HOST="$2"; shift 2 ;;
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--db) DB_PATH="$2"; shift 2 ;;
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--log) LOG="$2"; shift 2 ;;
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--echo) ECHO_URL="$2"; shift 2 ;;
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-h|--help)
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echo "Usage: scripts/sso-diagnose.sh [--instance <url>] [--idp <host>] [--smtp <host:port>] [--db <path>] [--log <path>] [--echo <url>]"
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exit 0 ;;
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*) echo "Unknown arg: $1" >&2; exit 2 ;;
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esac
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done
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IDP_URL="https://${IDP_HOST}"
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# ── log plumbing (machine-parseable) ──────────────────────────────────────────
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log() { printf '%s\n' "$*" | tee -a "$LOG"; }
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section() { log " ── $*"; }
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kv() { log " %-28s %s" "$1:" "$2"; }
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# redact anything that looks like a secret/token from a value before logging
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redact() {
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local v="$1"
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v="${v//$'\n'/ | }"
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# strip obvious bearer/oauth secrets & base64-ish blobs
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sed -E 's/(["'\''A-Za-z0-9_.\/+-]{24,})/<REDACTED>/g' <<<"$v"
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}
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log ""
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log "════════════════════════════════════════════════════════════════════"
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log "XAMXAM SSO/PeerTube diagnosis — $(date '+%Y-%m-%d %H:%M:%S %z')"
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log "════════════════════════════════════════════════════════════════════"
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# ── preflight ─────────────────────────────────────────────────────────────────
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for c in curl jq dig host; do
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command -v "$c" >/dev/null || { log " MISSING-DEP $c"; }
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done
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RESOLVE_TOOL="getent"
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command -v getent >/dev/null || RESOLVE_TOOL="host"
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# ═══════════════════════════════════════════════════════════════════════════════
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# 1. DNS + reverse DNS + HTTP identity (incident §3.5)
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# ═══════════════════════════════════════════════════════════════════════════════
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section "topology / DNS / reverse-DNS / HTTP identity"
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hosts=("videos.erg.be" "$SMTP_HOST" "$IDP_HOST")
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for h in "${hosts[@]}"; do
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if [[ "$RESOLVE_TOOL" == "getent" ]]; then
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ips="$(getent ahostsv4 "$h" 2>/dev/null | awk '{print $1}' | sort -u | head -3 | tr '\n' ' ')"
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else
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ips="$(host -t A "$h" 2>/dev/null | awk '/has address/{print $4}' | sort -u | head -3 | tr '\n' ' ')"
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fi
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ips="${ips// /}"
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if [[ -z "$ips" ]]; then
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kv "DNS[$h]" "NO-A-RECORD"
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continue
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fi
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kv "DNS[$h]" "$(echo "$ips" | tr ' ' ',')"
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first_ip="$(echo "$ips" | awk '{print $1}')"
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# reverse DNS
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if command -v dig >/dev/null; then
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rdns="$(dig +short -x "$first_ip" 2>/dev/null | tr '\n' ' ' | sed 's/[[:space:]]*$//')"
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else
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rdns="$(host "$first_ip" 2>/dev/null | awk '/pointer/{print $NF}' | sed 's/\.$//')"
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fi
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kv "rDNS[$first_ip]" "$(redact "${rdns:-none}")"
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done
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# ═══════════════════════════════════════════════════════════════════════════════
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# 2. SSO IdP discovery document (incident §3.5 — decisive fact)
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# ═══════════════════════════════════════════════════════════════════════════════
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section "SSO IdP discovery ($IDP_URL/.well-known/openid-configuration)"
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disc="$(curl -sS -m 20 -w $'\n%{http_code}' "$IDP_URL/.well-known/openid-configuration" 2>/dev/null)"
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disc_code="${disc##*$'\n'}"
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disc_body="${disc%$'\n'*}"
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disc_body="${disc_body%$'\n'}"
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kv "HTTP" "$disc_code"
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if [[ "$disc_code" == "200" ]]; then
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issuer="$(echo "$disc_body" | jq -r '.issuer // "n/a"')"
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grants="$(echo "$disc_body" | jq -r '.grant_types_supported // [] | join(",")')"
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resp_types="$(echo "$disc_body" | jq -r '.response_types_supported // [] | join(",")')"
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auth_ep="$(echo "$disc_body" | jq -r '.authorization_endpoint // "n/a"')"
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token_ep="$(echo "$disc_body" | jq -r '.token_endpoint // "n/a"')"
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kv "issuer" "$issuer"
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kv "grant_types_supported" "$grants"
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kv "response_types_supported" "$resp_types"
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kv "authorization_endpoint" "$auth_ep"
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kv "token_endpoint" "$token_ep"
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# decisive checks
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has_password=false; has_cc=false; has_authcode=false
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echo "$grants" | grep -q 'password' && has_password=true
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echo "$grants" | grep -q 'client_credentials' && has_cc=true
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echo "$grants" | grep -q 'authorization_code' && has_authcode=true
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log " FINDING grant.password → $([[ $has_password == true ]] && echo PRESENT || echo ABSENT)"
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log " FINDING grant.client_credentials → $([[ $has_cc == true ]] && echo PRESENT || echo ABSENT)"
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log " FINDING grant.authorization_code → $([[ $has_authcode == true ]] && echo PRESENT || echo ABSENT)"
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if [[ $has_password == false && $has_cc == false ]]; then
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log " CONCLUSION: IdP offers NO non-interactive grant → password/app-token paths are dead (matches report)."
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fi
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fi
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# ═══════════════════════════════════════════════════════════════════════════════
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# 3. PeerTube OAuth clients + password grant (incident §1 facts 3–5)
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# ═══════════════════════════════════════════════════════════════════════════════
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section "PeerTube OAuth ($INSTANCE)"
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api="${INSTANCE%/}/api/v1"
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ptcode="$(curl -sS -m 20 -o /dev/null -w '%{http_code}' "$INSTANCE/api/v1/config" 2>/dev/null)"
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kv "config HTTP" "$ptcode"
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# built-in local client — its client_id is public, its secret is NOT logged
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local_client="$(curl -sS -m 20 "$api/oauth-clients/local" 2>/dev/null)"
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if echo "$local_client" | jq -e '.client_id' >/dev/null 2>&1; then
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cid="$(echo "$local_client" | jq -r '.client_id')"
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kv "local client_id" "$(redact "$cid")"
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kv "local client present" "yes"
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else
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kv "local client" "not returned (may need auth)"
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fi
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# password grant result (only if creds-probe.php can supply creds securely)
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if [[ -f "$DB_PATH" && -f "$SCRIPT_DIR/creds-probe.php" && -x "$SCRIPT_DIR/creds-probe.php" ]]; then
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probe_out="$(php "$SCRIPT_DIR/creds-probe.php" --db "$DB_PATH" --instance "$INSTANCE" 2>/dev/null)"
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# $argv/$j are PHP variables (not shell); single quotes are intentional.
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# shellcheck disable=SC2016
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pt_ok="$(php -r 'echo (json_decode($argv[1],true)["peertube"]["ok"]??false)?"1":"0";' "$probe_out" 2>/dev/null)"
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# shellcheck disable=SC2016
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pt_code="$(php -r '$j=json_decode($argv[1],true)["peertube"]??[]; echo $j["code"]??"";' "$probe_out" 2>/dev/null)"
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kv "password-grant ok" "$pt_ok"
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kv "password-grant code" "$(redact "$pt_code")"
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if [[ "$pt_ok" == "0" && -n "$pt_code" ]]; then
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log " FINDING password-grant → REJECTED ($pt_code) — matches 'invalid_grant' if '$pt_code' == 'invalid_grant'"
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fi
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else
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kv "password-grant" "SKIPPED (creds-probe.php or DB unavailable → run: just creds-test)"
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fi
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# ═══════════════════════════════════════════════════════════════════════════════
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# 4. SMTP STARTTLS AUTH mechanisms (incident §3.5 — why SMTP still works)
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# ═══════════════════════════════════════════════════════════════════════════════
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section "SMTP AUTH mechanisms ($SMTP_HOST:$SMTP_PORT)"
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smtp_out="$(timeout 25 python3 - "$SMTP_HOST" "$SMTP_PORT" 2>/dev/null <<'PYEOF'
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import smtplib, ssl, sys
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host, port = sys.argv[1], int(sys.argv[2])
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try:
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s = smtplib.SMTP(host, port, timeout=20)
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s.ehlo()
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s.starttls(context=ssl.create_default_context())
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s.ehlo()
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print(s.esmtp_features.get("auth", "NONE"))
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s.quit()
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except Exception as e:
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print("ERROR: %s" % e)
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PYEOF
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)"
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kv "AUTH mechanisms" "$(redact "$smtp_out")"
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if echo "$smtp_out" | grep -qiE 'XOAUTH2|OAUTHBEARER'; then
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log " FINDING SMTP → SSO/OAuth2 wired in (XOAUTH2/OAUTHBEARER present)"
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fi
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if echo "$smtp_out" | grep -qiE '(^| )(PLAIN|LOGIN)( |$)'; then
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log " FINDING SMTP → legacy PLAIN/LOGIN KEPT → app's PLAIN auth still works (matches report)"
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else
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log " FINDING SMTP → PLAIN/LOGIN absent → SMTP would ALSO be broken"
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fi
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# ═══════════════════════════════════════════════════════════════════════════════
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# 5. Identity-header / PreserveHost propagation (the diagnosis' core question)
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# ═══════════════════════════════════════════════════════════════════════════════
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section "proxy → backend identity-header propagation"
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# (a) RESPONSE headers — what the public endpoint reflects. This can only ever show
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# *response* headers (X-Powered-By, Server, ...), NEVER an identity header that
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# LemonLDAP injects INTO the request. Absence here is NOT proof of absence upstream.
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kv "response-header scope" "response side only — cannot reveal inbound identity"
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hdrs="$(curl -sS -m 20 -D - -o /dev/null "$INSTANCE/" 2>/dev/null)"
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for hname in X-Powered-By Server Removed-User; do
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val="$(printf '%s' "$hdrs" | grep -i "^${hname}:" | head -1 | sed "s/^[^:]*:[[:space:]]*//" | tr -d '\r')"
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if [[ -n "$val" ]]; then
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kv "response [$hname]" "$(redact "$val")"
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fi
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done
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# (b) REQUEST-side identity headers — the part that actually answers the "❓".
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# These headers are injected by the SSO reverse-proxy into the request it forwards
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# to the backend. They are NOT visible in any public response; the ONLY way to see
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# them is to have an endpoint *behind* the proxy echo the request headers back.
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#
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# Two ways to get that echo:
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# -- self-host: run `scripts/echo-headers.php` behind the SAME LemonLDAP vhost
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# as PeerTube and point --echo at it, OR
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# -- a known public echo service (httpbin.org/headers) — but that only shows
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# headers the PUBLIC client sent, not ones LemonLDAP adds AFTER auth.
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section "request-side identity header probe (echo endpoint)"
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ECHO_URL="${ECHO_URL:-}"
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if [[ -n "$ECHO_URL" ]]; then
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echo_body="$(curl -sS -m 20 "$ECHO_URL" 2>/dev/null)"
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if echo "$echo_body" | jq -e '.headers' >/dev/null 2>&1; then
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# extract any identity-ish header, case-insensitively
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identity_hdrs="$(echo "$echo_body" | jq -r '.headers | to_entries[] | select(.key | test("remote[-_]?user|auth[-_]?user|x[-_]?forwarded[-_]?user|x[-_]?user|proxy[-_]?user|oidc[-_]?claim"; "i")) | "\(.key)=\(.value)"')"
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if [[ -n "$identity_hdrs" ]]; then
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log " → IDENTITY HEADERS SEEN AT BACKEND:"
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while IFS= read -r l; do kv " identity" "$(redact "$l")"; done <<< "$identity_hdrs"
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log " CONCLUSION: an authenticated-user header IS reaching the backend."
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else
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log " → NO identity header in the echoed request headers."
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log " CONCLUSION: LemonLDAP is protecting PeerTube but NOT telling it WHO the user is"
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log " → PeerTube has no authenticated identity to act on."
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fi
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else
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kv "echo endpoint" "unparseable/non-JSON (got: $(redact "${echo_body:0:80}"))"
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fi
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elif [[ -f "$SCRIPT_DIR/echo-headers.php" ]]; then
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kv "echo endpoint" "SKIPPED — pass --echo <url> (point it at echo-headers.php behind the same vhost)"
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else
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kv "echo endpoint" "NOT AVAILABLE — see scripts/echo-headers.php docs; --echo <url> enables the probe"
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fi
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log " HINT: to see headers LemonLDAP injects, host scripts/echo-headers.php behind"
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log " the SAME LemonLDAP vhost as PeerTube and re-run with --echo <that-url>."
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log " A public echo service only shows headers YOUR client sent, not the"
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log " post-auth headers the SSO proxy adds."
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# whether ProxyPreserveHost-equivalent is observable: compare Host saw vs sent
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host_sent="$(curl -sS -m 20 -s -o /dev/null -w '%{url_effective}' "$INSTANCE/" 2>/dev/null)"
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kv "effective-url" "$host_sent"
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log ""
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log "════════════════════════════════════════════════════════════════════"
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log "summary → log written to: $LOG"
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log "════════════════════════════════════════════════════════════════════"
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exit 0
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