feat(server): v2 secure-session-core Task 4 - rate limit + single-use codes
SPEC-002 Phase 1 Task 4 (the final keystone task), code-reviewed APPROVED. Closes the audit's reusable-code HIGH and rate-limiting-disabled HIGH. - Rebuilt rate limiting as a self-contained in-memory per-IP limiter (replaces the non-compiling tower_governor; removed that dep). Fixed-window caps wired to login (8/min), change-password (5/min), code-validate (15/min) -> 429; per-IP lockout after 10 consecutive failed code validations (15-min cooldown). - Single-use support codes: atomic consume on first agent bind (in-memory Pending->Connected under write lock + DB conditional UPDATE), rejecting a second presenter; validate/preview does not consume. - Widened code format: XXX-XXX-XXX, 31-char unambiguous alphabet (no 0/O/1/I/L), CSPRNG + rejection sampling, ~44.6 bits (replaces 6-digit numeric); migration 006 widens the code columns to TEXT. Completes the keystone (Tasks 1-4): every audit CRITICAL + HIGH in the secure auth/session core is now addressed. Known follow-up todos (not blocking): (1) trusted-proxy client-IP extraction (NPM-on-loopback collapses clients to 127.0.0.1); (2) multi-instance fail-closed DB single-use gate. Not cargo-check-verified locally - build-host/CI verification follows this commit. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
@@ -13,7 +13,9 @@ tokio = { version = "1", features = ["full", "sync", "time", "rt-multi-thread",
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axum = { version = "0.7", features = ["ws", "macros"] }
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tower = "0.5"
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tower-http = { version = "0.6", features = ["cors", "trace", "compression-gzip", "fs"] }
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tower_governor = { version = "0.4", features = ["axum"] }
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# NOTE: tower_governor removed in Task 4 — its rate-limit layer never compiled in
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# this codebase (the GovernorLayer generic signature it required is not in the
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# crate's public API). Replaced by the in-memory limiter in middleware/rate_limit.rs.
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# WebSocket
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futures-util = "0.3"
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21
server/migrations/006_widen_support_code.sql
Normal file
21
server/migrations/006_widen_support_code.sql
Normal file
@@ -0,0 +1,21 @@
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-- Migration: 006_widen_support_code.sql
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-- Purpose: v2 Task 4 — widen the support-code column to hold the new
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-- higher-entropy human-readable code.
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--
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-- v1 generated a 6-digit numeric code; the column was VARCHAR(10) (001). Task 4
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-- replaces it with a grouped base32-style code `XXX-XXX-XXX` (9 symbols + 2
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-- hyphens = 11 chars), which does NOT fit in VARCHAR(10). Widen to TEXT so the
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-- column can hold the new code (and any future longer format) without truncation.
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--
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-- connect_sessions.support_code (also VARCHAR(10) in 001) stores the same value
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-- on a support session record, so it is widened too.
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--
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-- Idempotent: ALTER ... TYPE TEXT is a no-op if the column is already TEXT.
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-- Applied on server startup by sqlx::migrate!(); never pre-applied via psql.
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-- See .claude/standards/gururmm/sqlx-migrations.md.
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ALTER TABLE connect_support_codes
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ALTER COLUMN code TYPE TEXT;
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ALTER TABLE connect_sessions
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ALTER COLUMN support_code TYPE TEXT;
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@@ -58,7 +58,11 @@ pub async fn get_support_code(
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.await
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}
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/// Update support code when client connects
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/// Update support code when client connects.
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///
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/// Superseded by [`consume_code_for_bind`] for the single-use bind path (Task 4);
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/// retained for any non-bind callers / future managed-session flows.
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#[allow(dead_code)]
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pub async fn mark_code_connected(
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pool: &PgPool,
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code: &str,
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@@ -86,6 +90,59 @@ pub async fn mark_code_connected(
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Ok(())
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}
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/// Atomically CONSUME a support code for a first-time agent bind (single-use).
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///
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/// This is the durable single-use guarantee (Task 4 — closes the reusable-code
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/// HIGH). It is a single conditional UPDATE: the row is updated ONLY if the code
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/// has never been consumed (`consumed_at IS NULL`) AND is still `pending`. On
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/// success it stamps `consumed_at = NOW()`, flips `status` to `'connected'`, and
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/// records the binding session/client, returning the row's id.
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///
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/// If ZERO rows match (code already consumed, already connected, completed,
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/// cancelled, expired, or nonexistent) it returns `Ok(None)` — the caller MUST
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/// reject the bind. Because the guard is in the `WHERE` clause, two concurrent
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/// presenters of the same code cannot both succeed: PostgreSQL serializes the
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/// row update, so the second sees `consumed_at` already set (or status no longer
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/// `pending`) and matches zero rows.
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///
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/// Returns `Ok(Some(id))` if THIS call consumed the code, `Ok(None)` if it was
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/// not available for consumption.
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pub async fn consume_code_for_bind(
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pool: &PgPool,
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code: &str,
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session_id: Option<Uuid>,
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client_name: Option<&str>,
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client_machine: Option<&str>,
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) -> Result<Option<Uuid>, sqlx::Error> {
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// The expiry guard mirrors the existing validity semantics: a code with an
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// `expires_at` in the past is not consumable. `expires_at IS NULL` means no
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// expiry was set (legacy/ad-hoc codes) and is allowed.
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let id: Option<Uuid> = sqlx::query_scalar(
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r#"
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UPDATE connect_support_codes
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SET status = 'connected',
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consumed_at = NOW(),
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session_id = $1,
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client_name = $2,
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client_machine = $3,
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connected_at = NOW()
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WHERE code = $4
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AND consumed_at IS NULL
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AND status = 'pending'
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AND (expires_at IS NULL OR expires_at > NOW())
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RETURNING id
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"#,
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)
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.bind(session_id)
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.bind(client_name)
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.bind(client_machine)
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.bind(code)
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.fetch_optional(pool)
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.await?;
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Ok(id)
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}
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/// Mark support code as completed
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pub async fn mark_code_completed(pool: &PgPool, code: &str) -> Result<(), sqlx::Error> {
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sqlx::query("UPDATE connect_support_codes SET status = 'completed' WHERE code = $1")
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@@ -21,7 +21,7 @@ pub mod proto {
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use anyhow::Result;
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use axum::http::{HeaderValue, Method};
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use axum::{
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extract::{Json, Path, Query, Request, State},
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extract::{ConnectInfo, Json, Path, Query, Request, State},
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http::StatusCode,
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middleware::{self as axum_middleware, Next},
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response::{Html, IntoResponse},
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@@ -58,6 +58,9 @@ pub struct AppState {
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pub registry: Arc<std::sync::Mutex<Registry>>,
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/// Server start time
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pub start_time: Arc<std::time::Instant>,
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/// Per-IP rate limiters + brute-force lockout (Task 4). Shared (Arc-backed
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/// internally) so cloning AppState shares the same counters.
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pub rate_limits: middleware::RateLimitState,
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}
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/// Middleware to inject JWT config and token blacklist into request extensions
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@@ -263,6 +266,7 @@ async fn main() -> Result<()> {
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metrics,
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registry,
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start_time,
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rate_limits: middleware::RateLimitState::new(),
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};
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// Build router
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@@ -271,11 +275,21 @@ async fn main() -> Result<()> {
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.route("/health", get(health))
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// Prometheus metrics (no auth required - for monitoring)
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.route("/metrics", get(prometheus_metrics))
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// Auth endpoints (TODO: Add rate limiting - see SEC2_RATE_LIMITING_TODO.md)
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.route("/api/auth/login", post(api::auth::login))
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// Auth endpoints. Per-IP rate limiting (Task 4) is attached per-route via
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// `route_layer` so it applies ONLY to these endpoints, not the whole app.
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.route(
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"/api/auth/login",
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post(api::auth::login).route_layer(axum_middleware::from_fn_with_state(
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state.clone(),
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middleware::login_rate_limit,
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)),
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)
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.route(
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"/api/auth/change-password",
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post(api::auth::change_password),
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post(api::auth::change_password).route_layer(axum_middleware::from_fn_with_state(
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state.clone(),
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middleware::change_password_rate_limit,
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)),
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)
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.route("/api/auth/me", get(api::auth::get_me))
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.route("/api/auth/logout", post(api::auth_logout::logout))
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@@ -306,10 +320,17 @@ async fn main() -> Result<()> {
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put(api::users::set_permissions),
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)
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.route("/api/users/:id/clients", put(api::users::set_client_access))
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// Portal API - Support codes (TODO: Add rate limiting)
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// Portal API - Support codes. The unauthenticated validate route is rate
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// limited + brute-force locked out per IP (Task 4).
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.route("/api/codes", post(create_code))
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.route("/api/codes", get(list_codes))
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.route("/api/codes/:code/validate", get(validate_code))
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.route(
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"/api/codes/:code/validate",
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get(validate_code).route_layer(axum_middleware::from_fn_with_state(
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state.clone(),
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middleware::code_validate_rate_limit,
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)),
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)
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.route("/api/codes/:code/cancel", post(cancel_code))
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// WebSocket endpoints
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.route("/ws/agent", get(relay::agent_ws_handler))
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@@ -450,7 +471,24 @@ async fn create_code(
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Json(request): Json<CreateCodeRequest>,
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) -> Json<SupportCode> {
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let code = state.support_codes.create_code(request).await;
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info!("Created support code: {}", code.code);
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// Persist the code to the database so the DURABLE single-use guard
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// (`db::support_codes::consume_code_for_bind`, Task 4) has a row to act on at
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// agent-bind time. The in-memory manager remains the live source of truth for
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// the auth decision; the DB row is the durable single-use record (and audit
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// trail) that also survives a server restart. A DB failure here is non-fatal:
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// the in-memory single-use consume still protects against reuse within this
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// process lifetime.
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if let Some(ref db) = state.db {
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if let Err(e) =
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db::support_codes::create_support_code(db.pool(), &code.code, &code.created_by).await
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{
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tracing::warn!("Failed to persist support code to database: {}", e);
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}
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}
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// Do not log the code value (it is a bearer credential for the session).
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info!("Created support code for {}", code.created_by);
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Json(code)
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}
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@@ -469,9 +507,29 @@ struct ValidateParams {
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async fn validate_code(
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State(state): State<AppState>,
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ConnectInfo(addr): ConnectInfo<SocketAddr>,
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Path(code): Path<String>,
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) -> Json<CodeValidation> {
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Json(state.support_codes.validate_code(&code).await)
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let ip = addr.ip();
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// PREVIEW ONLY: validate_code inspects the in-memory code state and does NOT
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// consume the code (single-use consumption happens at agent BIND, in
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// relay::handle_agent_connection). A valid preview here must not flip the
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// code to connected/consumed.
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let result = state.support_codes.validate_code(&code).await;
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// Feed the per-IP brute-force lockout (Task 4): a failed validation counts
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// toward the streak; a success resets it. The middleware
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// (`code_validate_rate_limit`) enforces the lockout BEFORE this handler runs,
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// so an already-locked IP never reaches here.
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if result.valid {
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state.rate_limits.code_validate_lockout.record_success(ip);
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} else {
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state.rate_limits.code_validate_lockout.record_failure(ip);
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tracing::warn!("Failed support-code validation from {}", ip);
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}
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Json(result)
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}
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async fn cancel_code(
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@@ -1,14 +1,13 @@
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//! Middleware modules
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// DISABLED: Rate limiting not yet functional due to type signature issues
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// See SEC2_RATE_LIMITING_TODO.md
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// pub mod rate_limit;
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//
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// pub use rate_limit::{
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// auth_rate_limiter,
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// support_code_rate_limiter,
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// api_rate_limiter,
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// };
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// Task 4: in-memory per-IP rate limiting + brute-force lockout. The v1
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// tower_governor-based limiter never compiled; this is a small self-contained
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// replacement. See rate_limit.rs.
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pub mod rate_limit;
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pub use rate_limit::{
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change_password_rate_limit, code_validate_rate_limit, login_rate_limit, RateLimitState,
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};
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// SEC-7 & SEC-12: Security headers middleware
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pub mod security_headers;
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@@ -1,59 +1,524 @@
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//! Rate limiting middleware using tower-governor
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//! In-memory rate limiting middleware (Task 4).
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//!
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//! Protects against brute force attacks on authentication endpoints.
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//! The v1 implementation leaned on `tower_governor` and never compiled (the
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//! `GovernorLayer` generic signature it tried to name does not exist in the
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//! crate's public API). Rather than fight those generics, this is a small,
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//! self-contained per-IP limiter behind a `Mutex<HashMap<…>>` — no new
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//! dependency, easy to reason about, and trivially unit-testable.
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//!
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//! Two protections are provided, both keyed by client IP:
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//!
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//! 1. **Fixed-window rate limit** ([`RateLimiter`]): at most `max_requests`
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//! per `window`. Over the cap → `429 Too Many Requests` (standard error
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//! envelope). Wired onto `POST /api/auth/login`,
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//! `POST /api/auth/change-password`, and the support-code validate route.
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//!
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//! 2. **Consecutive-failure lockout** ([`FailureLockout`]): after
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//! `max_failures` consecutive *failed* attempts from one IP, that IP is
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//! locked out for `cooldown`. A single success resets the counter. This is
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//! the brute-force defense for the support-code space (the code-validate
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//! route reports per-attempt success/failure into it).
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//!
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//! Client IP is taken from axum's [`ConnectInfo<SocketAddr>`] (the same source
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//! the relay uses for `client_ip`). `X-Forwarded-For` is intentionally NOT
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//! trusted here: the server terminates behind a known reverse proxy (NPM), and
|
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//! honoring a client-settable header would let an attacker trivially rotate the
|
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//! limiter key. If/when per-proxy XFF handling is needed it must be gated on a
|
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//! trusted-proxy allowlist — tracked as a follow-up, not done blindly here.
|
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//!
|
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//! Memory is bounded by pruning expired entries opportunistically on each call
|
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//! and capping the map size; an unbounded attacker rotating source IPs cannot
|
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//! grow the maps without bound.
|
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|
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use tower_governor::{
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governor::GovernorConfigBuilder,
|
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GovernorLayer,
|
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use std::collections::HashMap;
|
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use std::net::IpAddr;
|
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use std::sync::Mutex;
|
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use std::time::{Duration, Instant};
|
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|
||||
use axum::{
|
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extract::{ConnectInfo, State},
|
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http::StatusCode,
|
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response::{IntoResponse, Response},
|
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Json,
|
||||
};
|
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use serde::Serialize;
|
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use std::net::SocketAddr;
|
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|
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/// Create rate limiting layer for authentication endpoints
|
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// ============================================================================
|
||||
// Tunables (named constants — no magic numbers at the call sites)
|
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// ============================================================================
|
||||
|
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/// Login: window length for the fixed-window counter.
|
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pub const LOGIN_WINDOW: Duration = Duration::from_secs(60);
|
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/// Login: max requests per window per IP. Comfortable for a human retyping a
|
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/// password, hostile for a credential-stuffing loop.
|
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pub const LOGIN_MAX_PER_WINDOW: u32 = 8;
|
||||
|
||||
/// Change-password: window length.
|
||||
pub const CHANGE_PASSWORD_WINDOW: Duration = Duration::from_secs(60);
|
||||
/// Change-password: max requests per window per IP. Tighter than login — a user
|
||||
/// changes their password rarely, and this endpoint already requires a valid
|
||||
/// session, so a low cap costs nothing legitimate.
|
||||
pub const CHANGE_PASSWORD_MAX_PER_WINDOW: u32 = 5;
|
||||
|
||||
/// Support-code validate: window length.
|
||||
pub const CODE_VALIDATE_WINDOW: Duration = Duration::from_secs(60);
|
||||
/// Support-code validate: max requests per window per IP. Tight, because the
|
||||
/// code space is small relative to a password and this route is the brute-force
|
||||
/// surface for it.
|
||||
pub const CODE_VALIDATE_MAX_PER_WINDOW: u32 = 15;
|
||||
|
||||
/// Support-code validate: consecutive failed validations from one IP that trip
|
||||
/// the lockout.
|
||||
pub const CODE_VALIDATE_MAX_FAILURES: u32 = 10;
|
||||
/// Support-code validate: how long an IP stays locked out once tripped.
|
||||
pub const CODE_VALIDATE_LOCKOUT: Duration = Duration::from_secs(15 * 60);
|
||||
|
||||
/// Hard cap on the number of distinct IPs tracked by any single limiter map.
|
||||
/// Prevents an IP-rotating attacker from growing memory without bound. When the
|
||||
/// cap is hit, the oldest-windowed entries are pruned. Generous for a real MSP
|
||||
/// fleet; an attacker hitting it is already being throttled per-IP.
|
||||
const MAX_TRACKED_IPS: usize = 100_000;
|
||||
|
||||
// ============================================================================
|
||||
// Fixed-window rate limiter
|
||||
// ============================================================================
|
||||
|
||||
/// One IP's fixed-window counter.
|
||||
#[derive(Debug, Clone, Copy)]
|
||||
struct Window {
|
||||
/// When the current window started.
|
||||
started: Instant,
|
||||
/// Requests counted in the current window.
|
||||
count: u32,
|
||||
}
|
||||
|
||||
/// Per-IP fixed-window rate limiter. Cheap, lock-guarded, self-pruning.
|
||||
///
|
||||
/// Allows 5 requests per minute per IP address
|
||||
pub fn auth_rate_limiter() -> impl tower::Layer<tower::service_fn::ServiceFn<impl Fn(axum::http::Request<axum::body::Body>) -> std::future::Future<Output = Result<axum::http::Response<axum::body::Body>, std::convert::Infallible>>>> {
|
||||
let governor_conf = Box::new(
|
||||
GovernorConfigBuilder::default()
|
||||
.per_millisecond(60000 / 5) // 5 requests per minute
|
||||
.burst_size(5)
|
||||
.finish()
|
||||
.unwrap()
|
||||
);
|
||||
/// Cloneable: the inner state is shared via `Arc`-less `&'static`/`State`
|
||||
/// ownership in this app, but we keep an explicit `Arc` so it can live in
|
||||
/// `AppState` and be cloned with it.
|
||||
#[derive(Clone)]
|
||||
pub struct RateLimiter {
|
||||
inner: std::sync::Arc<Mutex<HashMap<IpAddr, Window>>>,
|
||||
max_requests: u32,
|
||||
window: Duration,
|
||||
}
|
||||
|
||||
GovernorLayer {
|
||||
config: Box::leak(governor_conf),
|
||||
impl RateLimiter {
|
||||
/// Create a limiter allowing `max_requests` per `window` per IP.
|
||||
pub fn new(max_requests: u32, window: Duration) -> Self {
|
||||
Self {
|
||||
inner: std::sync::Arc::new(Mutex::new(HashMap::new())),
|
||||
max_requests,
|
||||
window,
|
||||
}
|
||||
}
|
||||
|
||||
/// Record a request from `ip` and report whether it is allowed.
|
||||
///
|
||||
/// Returns `true` if the request is within the cap (and counts it), `false`
|
||||
/// if the IP is over the cap for the current window. Uses `now` as the clock
|
||||
/// so the window logic is unit-testable without sleeping.
|
||||
fn check_at(&self, ip: IpAddr, now: Instant) -> bool {
|
||||
let mut map = self.inner.lock().unwrap_or_else(|e| e.into_inner());
|
||||
|
||||
// Opportunistic prune: if the map has grown large, drop entries whose
|
||||
// window has fully elapsed (they would reset on next touch anyway).
|
||||
if map.len() >= MAX_TRACKED_IPS {
|
||||
let window = self.window;
|
||||
map.retain(|_, w| now.duration_since(w.started) < window);
|
||||
}
|
||||
|
||||
let entry = map.entry(ip).or_insert(Window {
|
||||
started: now,
|
||||
count: 0,
|
||||
});
|
||||
|
||||
// Roll the window forward if it has elapsed.
|
||||
if now.duration_since(entry.started) >= self.window {
|
||||
entry.started = now;
|
||||
entry.count = 0;
|
||||
}
|
||||
|
||||
if entry.count >= self.max_requests {
|
||||
false
|
||||
} else {
|
||||
entry.count += 1;
|
||||
true
|
||||
}
|
||||
}
|
||||
|
||||
/// Record a request from `ip` (using the real clock) and report whether it
|
||||
/// is allowed.
|
||||
pub fn check(&self, ip: IpAddr) -> bool {
|
||||
self.check_at(ip, Instant::now())
|
||||
}
|
||||
}
|
||||
|
||||
/// Create rate limiting layer for support code validation
|
||||
///
|
||||
/// Allows 10 requests per minute per IP address
|
||||
pub fn support_code_rate_limiter() -> impl tower::Layer<tower::service_fn::ServiceFn<impl Fn(axum::http::Request<axum::body::Body>) -> std::future::Future<Output = Result<axum::http::Response<axum::body::Body>, std::convert::Infallible>>>> {
|
||||
let governor_conf = Box::new(
|
||||
GovernorConfigBuilder::default()
|
||||
.per_millisecond(60000 / 10) // 10 requests per minute
|
||||
.burst_size(10)
|
||||
.finish()
|
||||
.unwrap()
|
||||
);
|
||||
// ============================================================================
|
||||
// Consecutive-failure lockout
|
||||
// ============================================================================
|
||||
|
||||
GovernorLayer {
|
||||
config: Box::leak(governor_conf),
|
||||
/// One IP's failure-streak state.
|
||||
#[derive(Debug, Clone, Copy)]
|
||||
struct FailState {
|
||||
/// Consecutive failures since the last success / lockout.
|
||||
failures: u32,
|
||||
/// If `Some`, the IP is locked out until this instant.
|
||||
locked_until: Option<Instant>,
|
||||
/// Last time this entry was touched (for pruning).
|
||||
last_seen: Instant,
|
||||
}
|
||||
|
||||
/// Per-IP consecutive-failure lockout. After `max_failures` consecutive
|
||||
/// failures the IP is locked out for `cooldown`; a success resets the streak.
|
||||
#[derive(Clone)]
|
||||
pub struct FailureLockout {
|
||||
inner: std::sync::Arc<Mutex<HashMap<IpAddr, FailState>>>,
|
||||
max_failures: u32,
|
||||
cooldown: Duration,
|
||||
}
|
||||
|
||||
impl FailureLockout {
|
||||
/// Create a lockout that trips after `max_failures` consecutive failures and
|
||||
/// holds for `cooldown`.
|
||||
pub fn new(max_failures: u32, cooldown: Duration) -> Self {
|
||||
Self {
|
||||
inner: std::sync::Arc::new(Mutex::new(HashMap::new())),
|
||||
max_failures,
|
||||
cooldown,
|
||||
}
|
||||
}
|
||||
|
||||
/// Is `ip` currently locked out? (clock injected for tests)
|
||||
fn is_locked_at(&self, ip: IpAddr, now: Instant) -> bool {
|
||||
let mut map = self.inner.lock().unwrap_or_else(|e| e.into_inner());
|
||||
match map.get(&ip) {
|
||||
Some(state) => match state.locked_until {
|
||||
Some(until) if now < until => true,
|
||||
Some(_) => {
|
||||
// Lockout elapsed — clear it so the IP gets a fresh start.
|
||||
if let Some(s) = map.get_mut(&ip) {
|
||||
s.locked_until = None;
|
||||
s.failures = 0;
|
||||
}
|
||||
false
|
||||
}
|
||||
None => false,
|
||||
},
|
||||
None => false,
|
||||
}
|
||||
}
|
||||
|
||||
/// Is `ip` currently locked out? (real clock)
|
||||
pub fn is_locked(&self, ip: IpAddr) -> bool {
|
||||
self.is_locked_at(ip, Instant::now())
|
||||
}
|
||||
|
||||
/// Record a failed attempt from `ip`. Trips the lockout once the streak
|
||||
/// reaches `max_failures`. (clock injected for tests)
|
||||
fn record_failure_at(&self, ip: IpAddr, now: Instant) {
|
||||
let mut map = self.inner.lock().unwrap_or_else(|e| e.into_inner());
|
||||
|
||||
if map.len() >= MAX_TRACKED_IPS {
|
||||
let cooldown = self.cooldown;
|
||||
map.retain(|_, s| {
|
||||
s.locked_until.map(|u| now < u).unwrap_or(false)
|
||||
|| now.duration_since(s.last_seen) < cooldown
|
||||
});
|
||||
}
|
||||
|
||||
let state = map.entry(ip).or_insert(FailState {
|
||||
failures: 0,
|
||||
locked_until: None,
|
||||
last_seen: now,
|
||||
});
|
||||
state.last_seen = now;
|
||||
state.failures = state.failures.saturating_add(1);
|
||||
if state.failures >= self.max_failures {
|
||||
state.locked_until = Some(now + self.cooldown);
|
||||
}
|
||||
}
|
||||
|
||||
/// Record a failed attempt from `ip` (real clock).
|
||||
pub fn record_failure(&self, ip: IpAddr) {
|
||||
self.record_failure_at(ip, Instant::now());
|
||||
}
|
||||
|
||||
/// Record a successful attempt from `ip`, resetting its failure streak.
|
||||
pub fn record_success(&self, ip: IpAddr) {
|
||||
let mut map = self.inner.lock().unwrap_or_else(|e| e.into_inner());
|
||||
if let Some(state) = map.get_mut(&ip) {
|
||||
state.failures = 0;
|
||||
state.locked_until = None;
|
||||
state.last_seen = Instant::now();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Create rate limiting layer for API endpoints
|
||||
///
|
||||
/// Allows 60 requests per minute per IP address
|
||||
pub fn api_rate_limiter() -> impl tower::Layer<tower::service_fn::ServiceFn<impl Fn(axum::http::Request<axum::body::Body>) -> std::future::Future<Output = Result<axum::http::Response<axum::body::Body>, std::convert::Infallible>>>> {
|
||||
let governor_conf = Box::new(
|
||||
GovernorConfigBuilder::default()
|
||||
.per_millisecond(1000) // 1 request per second
|
||||
.burst_size(60)
|
||||
.finish()
|
||||
.unwrap()
|
||||
);
|
||||
// ============================================================================
|
||||
// Shared rate-limit state (lives in AppState)
|
||||
// ============================================================================
|
||||
|
||||
GovernorLayer {
|
||||
config: Box::leak(governor_conf),
|
||||
/// Bundle of limiters carried in `AppState` and consumed by the middleware.
|
||||
#[derive(Clone)]
|
||||
pub struct RateLimitState {
|
||||
/// `POST /api/auth/login`
|
||||
pub login: RateLimiter,
|
||||
/// `POST /api/auth/change-password`
|
||||
pub change_password: RateLimiter,
|
||||
/// `GET /api/codes/:code/validate` (request-rate cap)
|
||||
pub code_validate: RateLimiter,
|
||||
/// Per-IP lockout on repeated failed code validations (brute-force defense).
|
||||
pub code_validate_lockout: FailureLockout,
|
||||
}
|
||||
|
||||
impl RateLimitState {
|
||||
pub fn new() -> Self {
|
||||
Self {
|
||||
login: RateLimiter::new(LOGIN_MAX_PER_WINDOW, LOGIN_WINDOW),
|
||||
change_password: RateLimiter::new(
|
||||
CHANGE_PASSWORD_MAX_PER_WINDOW,
|
||||
CHANGE_PASSWORD_WINDOW,
|
||||
),
|
||||
code_validate: RateLimiter::new(CODE_VALIDATE_MAX_PER_WINDOW, CODE_VALIDATE_WINDOW),
|
||||
code_validate_lockout: FailureLockout::new(
|
||||
CODE_VALIDATE_MAX_FAILURES,
|
||||
CODE_VALIDATE_LOCKOUT,
|
||||
),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Default for RateLimitState {
|
||||
fn default() -> Self {
|
||||
Self::new()
|
||||
}
|
||||
}
|
||||
|
||||
// ============================================================================
|
||||
// 429 response (standard error envelope)
|
||||
// ============================================================================
|
||||
|
||||
#[derive(Debug, Serialize)]
|
||||
struct RateLimitError {
|
||||
detail: String,
|
||||
error_code: String,
|
||||
status_code: u16,
|
||||
}
|
||||
|
||||
/// Build a `429 Too Many Requests` response using the standard error envelope.
|
||||
fn too_many_requests(detail: &str, error_code: &str) -> Response {
|
||||
(
|
||||
StatusCode::TOO_MANY_REQUESTS,
|
||||
Json(RateLimitError {
|
||||
detail: detail.to_string(),
|
||||
error_code: error_code.to_string(),
|
||||
status_code: StatusCode::TOO_MANY_REQUESTS.as_u16(),
|
||||
}),
|
||||
)
|
||||
.into_response()
|
||||
}
|
||||
|
||||
// ============================================================================
|
||||
// Axum middleware functions (one per protected route)
|
||||
// ============================================================================
|
||||
|
||||
/// Selects which limiter from [`RateLimitState`] a middleware uses.
|
||||
///
|
||||
/// Each protected route gets its own `from_fn_with_state` middleware pointing at
|
||||
/// the matching limiter; keeping them as distinct functions avoids threading an
|
||||
/// extra "which limiter" parameter through the layer and keeps the wiring in
|
||||
/// `main.rs` self-documenting.
|
||||
|
||||
/// Rate-limit middleware for `POST /api/auth/login`.
|
||||
pub async fn login_rate_limit(
|
||||
State(state): State<crate::AppState>,
|
||||
ConnectInfo(addr): ConnectInfo<SocketAddr>,
|
||||
request: axum::extract::Request,
|
||||
next: axum::middleware::Next,
|
||||
) -> Response {
|
||||
let ip = addr.ip();
|
||||
if !state.rate_limits.login.check(ip) {
|
||||
tracing::warn!("Rate limit exceeded on /api/auth/login from {}", ip);
|
||||
return too_many_requests(
|
||||
"Too many login attempts. Please wait a minute and try again.",
|
||||
"RATE_LIMITED",
|
||||
);
|
||||
}
|
||||
next.run(request).await
|
||||
}
|
||||
|
||||
/// Rate-limit middleware for `POST /api/auth/change-password`.
|
||||
pub async fn change_password_rate_limit(
|
||||
State(state): State<crate::AppState>,
|
||||
ConnectInfo(addr): ConnectInfo<SocketAddr>,
|
||||
request: axum::extract::Request,
|
||||
next: axum::middleware::Next,
|
||||
) -> Response {
|
||||
let ip = addr.ip();
|
||||
if !state.rate_limits.change_password.check(ip) {
|
||||
tracing::warn!(
|
||||
"Rate limit exceeded on /api/auth/change-password from {}",
|
||||
ip
|
||||
);
|
||||
return too_many_requests(
|
||||
"Too many password-change attempts. Please wait a minute and try again.",
|
||||
"RATE_LIMITED",
|
||||
);
|
||||
}
|
||||
next.run(request).await
|
||||
}
|
||||
|
||||
/// Rate-limit + brute-force-lockout middleware for the support-code validate
|
||||
/// route (`GET /api/codes/:code/validate`).
|
||||
///
|
||||
/// Two gates run here:
|
||||
/// 1. If the IP is currently locked out (too many consecutive failed
|
||||
/// validations), reject immediately with 429 — before the handler runs, so
|
||||
/// the code is never even looked up.
|
||||
/// 2. Otherwise apply the per-window request cap.
|
||||
///
|
||||
/// The success/failure that drives the lockout is reported by the handler
|
||||
/// itself (it knows whether the code was valid), via
|
||||
/// [`RateLimitState::code_validate_lockout`].
|
||||
pub async fn code_validate_rate_limit(
|
||||
State(state): State<crate::AppState>,
|
||||
ConnectInfo(addr): ConnectInfo<SocketAddr>,
|
||||
request: axum::extract::Request,
|
||||
next: axum::middleware::Next,
|
||||
) -> Response {
|
||||
let ip = addr.ip();
|
||||
|
||||
// 1. Brute-force lockout takes precedence.
|
||||
if state.rate_limits.code_validate_lockout.is_locked(ip) {
|
||||
tracing::warn!(
|
||||
"Code-validate request from locked-out IP {} (too many failed attempts)",
|
||||
ip
|
||||
);
|
||||
return too_many_requests(
|
||||
"Too many invalid codes from this address. Try again later.",
|
||||
"RATE_LIMITED_LOCKOUT",
|
||||
);
|
||||
}
|
||||
|
||||
// 2. Per-window request cap.
|
||||
if !state.rate_limits.code_validate.check(ip) {
|
||||
tracing::warn!("Rate limit exceeded on code-validate from {}", ip);
|
||||
return too_many_requests(
|
||||
"Too many code validation attempts. Please wait a minute and try again.",
|
||||
"RATE_LIMITED",
|
||||
);
|
||||
}
|
||||
|
||||
next.run(request).await
|
||||
}
|
||||
|
||||
// ============================================================================
|
||||
// Tests
|
||||
// ============================================================================
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
|
||||
fn ip(n: u8) -> IpAddr {
|
||||
IpAddr::from([10, 0, 0, n])
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn fixed_window_allows_up_to_cap_then_blocks() {
|
||||
let limiter = RateLimiter::new(3, Duration::from_secs(60));
|
||||
let t0 = Instant::now();
|
||||
let a = ip(1);
|
||||
|
||||
assert!(limiter.check_at(a, t0)); // 1
|
||||
assert!(limiter.check_at(a, t0)); // 2
|
||||
assert!(limiter.check_at(a, t0)); // 3
|
||||
assert!(!limiter.check_at(a, t0)); // 4 -> blocked
|
||||
assert!(!limiter.check_at(a, t0)); // still blocked
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn fixed_window_resets_after_window_elapses() {
|
||||
let limiter = RateLimiter::new(2, Duration::from_secs(60));
|
||||
let t0 = Instant::now();
|
||||
let a = ip(2);
|
||||
|
||||
assert!(limiter.check_at(a, t0));
|
||||
assert!(limiter.check_at(a, t0));
|
||||
assert!(!limiter.check_at(a, t0)); // over cap
|
||||
|
||||
// Advance past the window — counter resets.
|
||||
let t1 = t0 + Duration::from_secs(61);
|
||||
assert!(limiter.check_at(a, t1));
|
||||
assert!(limiter.check_at(a, t1));
|
||||
assert!(!limiter.check_at(a, t1));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn fixed_window_is_per_ip() {
|
||||
let limiter = RateLimiter::new(1, Duration::from_secs(60));
|
||||
let t0 = Instant::now();
|
||||
|
||||
assert!(limiter.check_at(ip(3), t0));
|
||||
assert!(!limiter.check_at(ip(3), t0)); // ip3 over cap
|
||||
assert!(limiter.check_at(ip(4), t0)); // ip4 independent
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn lockout_trips_after_consecutive_failures() {
|
||||
let lockout = FailureLockout::new(3, Duration::from_secs(600));
|
||||
let t0 = Instant::now();
|
||||
let a = ip(5);
|
||||
|
||||
assert!(!lockout.is_locked_at(a, t0));
|
||||
lockout.record_failure_at(a, t0); // 1
|
||||
assert!(!lockout.is_locked_at(a, t0));
|
||||
lockout.record_failure_at(a, t0); // 2
|
||||
assert!(!lockout.is_locked_at(a, t0));
|
||||
lockout.record_failure_at(a, t0); // 3 -> trips
|
||||
assert!(lockout.is_locked_at(a, t0));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn lockout_success_resets_streak() {
|
||||
let lockout = FailureLockout::new(3, Duration::from_secs(600));
|
||||
let t0 = Instant::now();
|
||||
let a = ip(6);
|
||||
|
||||
lockout.record_failure_at(a, t0);
|
||||
lockout.record_failure_at(a, t0);
|
||||
lockout.record_success(a); // streak reset
|
||||
lockout.record_failure_at(a, t0);
|
||||
lockout.record_failure_at(a, t0);
|
||||
// Only two failures since the reset — not yet locked.
|
||||
assert!(!lockout.is_locked_at(a, t0));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn lockout_expires_after_cooldown() {
|
||||
let lockout = FailureLockout::new(2, Duration::from_secs(600));
|
||||
let t0 = Instant::now();
|
||||
let a = ip(7);
|
||||
|
||||
lockout.record_failure_at(a, t0);
|
||||
lockout.record_failure_at(a, t0); // trips
|
||||
assert!(lockout.is_locked_at(a, t0));
|
||||
|
||||
// After the cooldown the lock clears.
|
||||
let t1 = t0 + Duration::from_secs(601);
|
||||
assert!(!lockout.is_locked_at(a, t1));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn lockout_is_per_ip() {
|
||||
let lockout = FailureLockout::new(1, Duration::from_secs(600));
|
||||
let t0 = Instant::now();
|
||||
|
||||
lockout.record_failure_at(ip(8), t0); // trips ip8
|
||||
assert!(lockout.is_locked_at(ip(8), t0));
|
||||
assert!(!lockout.is_locked_at(ip(9), t0)); // ip9 unaffected
|
||||
}
|
||||
}
|
||||
|
||||
@@ -128,17 +128,46 @@ pub async fn agent_ws_handler(
|
||||
return Err(StatusCode::UNAUTHORIZED);
|
||||
}
|
||||
|
||||
// Validate support code if provided
|
||||
// Validate AND CONSUME the support code if provided (single-use, Task 4).
|
||||
//
|
||||
// SINGLE-USE (closes the reusable-code HIGH): a support code is consumed
|
||||
// ATOMICALLY on the FIRST successful agent bind. `consume_for_bind` accepts
|
||||
// the code only if it is currently `Pending` (never used) and flips it to
|
||||
// `Connected` under the manager's write lock; a SECOND presenter of the same
|
||||
// code sees it already `Connected` and is rejected here, before the socket is
|
||||
// upgraded. This replaces the v1 check that accepted `pending` OR `connected`
|
||||
// (which let any number of agents reuse one code).
|
||||
//
|
||||
// AUTHORITATIVE single-use gate = the in-memory atomic consume. The in-memory
|
||||
// manager is the live source of truth for a code's joinable state (it is what
|
||||
// the portal create + validate paths use), and it is empty on a fresh process,
|
||||
// so a code from a previous run is already unknown here and rejected. A second
|
||||
// presenter within this run loses the `Pending → Connected` race and is
|
||||
// rejected. This single check closes the reusable-code HIGH.
|
||||
//
|
||||
// The database additionally carries a DURABLE single-use marker
|
||||
// (`consume_code_for_bind`: a conditional UPDATE guarded by `consumed_at IS
|
||||
// NULL AND status = 'pending'`). It is applied best-effort AFTER the
|
||||
// authoritative in-memory consume — it stamps `consumed_at` for the audit
|
||||
// trail and cross-restart durability, but a missing/uninsertable DB row must
|
||||
// NOT veto an agent the in-memory layer already admitted (the DB row is only
|
||||
// populated opportunistically by the portal create path).
|
||||
if let Some(ref code) = support_code {
|
||||
// Check if it's a valid, pending support code
|
||||
let code_info = state.support_codes.get_status(code).await;
|
||||
if code_info.is_none() {
|
||||
let consumed = state
|
||||
.support_codes
|
||||
.consume_for_bind(code, Some(agent_name.clone()), Some(agent_id.clone()))
|
||||
.await;
|
||||
|
||||
if !consumed {
|
||||
warn!(
|
||||
"Agent connection rejected: {} from {} - invalid support code {}",
|
||||
agent_id, client_ip, code
|
||||
"Agent connection rejected: {} from {} - support code already used, \
|
||||
invalid, expired, or cancelled",
|
||||
agent_id, client_ip
|
||||
);
|
||||
|
||||
// Log failed connection attempt
|
||||
// Log failed connection attempt. We cannot distinguish reuse from a
|
||||
// nonexistent code without leaking timing, so log the generic
|
||||
// invalid-code event (never log the code value itself).
|
||||
if let Some(ref db) = state.db {
|
||||
let _ = db::events::log_event(
|
||||
db.pool(),
|
||||
@@ -147,8 +176,7 @@ pub async fn agent_ws_handler(
|
||||
None,
|
||||
Some(&agent_id),
|
||||
Some(serde_json::json!({
|
||||
"reason": "invalid_code",
|
||||
"support_code": code,
|
||||
"reason": "code_unavailable_or_already_used",
|
||||
"agent_id": agent_id
|
||||
})),
|
||||
Some(client_ip),
|
||||
@@ -158,42 +186,46 @@ pub async fn agent_ws_handler(
|
||||
|
||||
return Err(StatusCode::UNAUTHORIZED);
|
||||
}
|
||||
let status = code_info.unwrap();
|
||||
if status != "pending" && status != "connected" {
|
||||
warn!(
|
||||
"Agent connection rejected: {} from {} - support code {} has status {}",
|
||||
agent_id, client_ip, code, status
|
||||
);
|
||||
|
||||
// Log failed connection attempt (expired/cancelled code)
|
||||
if let Some(ref db) = state.db {
|
||||
let event_type = if status == "cancelled" {
|
||||
db::events::EventTypes::CONNECTION_REJECTED_CANCELLED_CODE
|
||||
} else {
|
||||
db::events::EventTypes::CONNECTION_REJECTED_EXPIRED_CODE
|
||||
};
|
||||
|
||||
let _ = db::events::log_event(
|
||||
db.pool(),
|
||||
Uuid::new_v4(),
|
||||
event_type,
|
||||
None,
|
||||
Some(&agent_id),
|
||||
Some(serde_json::json!({
|
||||
"reason": status,
|
||||
"support_code": code,
|
||||
"agent_id": agent_id
|
||||
})),
|
||||
Some(client_ip),
|
||||
)
|
||||
.await;
|
||||
// Durable single-use marker in the database (best-effort; see above). The
|
||||
// real session_id is attached later in `handle_agent_connection` once the
|
||||
// socket has upgraded; here we only stamp `consumed_at` on the row if it
|
||||
// exists. `Ok(None)` (no consumable row) and `Err` are logged, not fatal —
|
||||
// the in-memory consume already authorized this bind.
|
||||
if let Some(ref db) = state.db {
|
||||
match db::support_codes::consume_code_for_bind(
|
||||
db.pool(),
|
||||
code,
|
||||
None,
|
||||
Some(&agent_name),
|
||||
Some(&agent_id),
|
||||
)
|
||||
.await
|
||||
{
|
||||
Ok(Some(_id)) => { /* durable consume recorded */ }
|
||||
Ok(None) => {
|
||||
// No consumable DB row (the code may not have been persisted,
|
||||
// or was already consumed in the DB). Non-fatal: the in-memory
|
||||
// layer is authoritative for this process.
|
||||
tracing::debug!(
|
||||
"No durable support-code row to consume for agent {} (in-memory \
|
||||
consume already authoritative)",
|
||||
agent_id
|
||||
);
|
||||
}
|
||||
Err(e) => {
|
||||
tracing::warn!(
|
||||
"Database error stamping durable support-code consume for {}: {}",
|
||||
agent_id,
|
||||
e
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
return Err(StatusCode::UNAUTHORIZED);
|
||||
}
|
||||
|
||||
info!(
|
||||
"Agent {} from {} authenticated via support code {}",
|
||||
agent_id, client_ip, code
|
||||
"Agent {} from {} authenticated via single-use support code",
|
||||
agent_id, client_ip
|
||||
);
|
||||
}
|
||||
|
||||
@@ -568,24 +600,21 @@ async fn handle_agent_connection(
|
||||
None
|
||||
};
|
||||
|
||||
// If a support code was provided, mark it as connected
|
||||
// If a support code was provided, link it to the real session.
|
||||
//
|
||||
// The code was already CONSUMED atomically (single-use) in `agent_ws_handler`
|
||||
// before this upgrade — it is already `Connected`/`consumed_at` set in both
|
||||
// the in-memory manager and (if a DB is configured) the database. Here we only
|
||||
// establish the mapping to the REAL session_id, which is not known until the
|
||||
// socket has upgraded and `register_agent` has run. We do NOT re-consume or
|
||||
// re-flip status (that would defeat the single-use guard).
|
||||
if let Some(ref code) = support_code {
|
||||
info!("Linking support code {} to session {}", code, session_id);
|
||||
support_codes
|
||||
.mark_connected(code, Some(agent_name.clone()), Some(agent_id.clone()))
|
||||
.await;
|
||||
info!("Linking support code to session {}", session_id);
|
||||
support_codes.link_session(code, session_id).await;
|
||||
|
||||
// Database: update support code
|
||||
// Database: attach the real session_id to the already-consumed code row.
|
||||
if let Some(ref db) = db {
|
||||
let _ = db::support_codes::mark_code_connected(
|
||||
db.pool(),
|
||||
code,
|
||||
Some(session_id),
|
||||
Some(&agent_name),
|
||||
Some(&agent_id),
|
||||
)
|
||||
.await;
|
||||
let _ = db::support_codes::link_session_to_code(db.pool(), code, session_id).await;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
@@ -1,16 +1,74 @@
|
||||
//! Support session codes management
|
||||
//!
|
||||
//! Handles generation and validation of 6-digit support codes
|
||||
//! for one-time remote support sessions.
|
||||
//! Handles generation and validation of high-entropy, human-readable support
|
||||
//! codes for one-time remote support sessions.
|
||||
//!
|
||||
//! ## Code format (Task 4)
|
||||
//!
|
||||
//! v1 used a 6-digit numeric code (~20 bits, trivially brute-forceable). v2 uses
|
||||
//! a grouped base32-style code drawn from an UNAMBIGUOUS alphabet (no `0`/`O`,
|
||||
//! `1`/`I`/`L`) so a human reading it aloud cannot mistranscribe it:
|
||||
//!
|
||||
//! ```text
|
||||
//! XXX-XXX-XXX e.g. K7P-3MQ-Z9F
|
||||
//! ```
|
||||
//!
|
||||
//! 9 symbols over a 31-character alphabet ≈ **44.6 bits** of entropy, generated
|
||||
//! with a CSPRNG ([`OsRng`]). Combined with the per-IP rate limiting + lockout on
|
||||
//! the validate route (Task 4) and single-use consumption on bind, the code space
|
||||
//! is no longer practically brute-forceable.
|
||||
|
||||
use chrono::{DateTime, Utc};
|
||||
use rand::Rng;
|
||||
use rand::rngs::OsRng;
|
||||
use rand::RngCore;
|
||||
use serde::{Deserialize, Serialize};
|
||||
use std::collections::HashMap;
|
||||
use std::sync::Arc;
|
||||
use tokio::sync::RwLock;
|
||||
use uuid::Uuid;
|
||||
|
||||
/// Unambiguous code alphabet: digits 2-9 and A-Z, EXCLUDING the visually
|
||||
/// confusable `0`/`O`, `1`/`I`/`L`. 31 distinct symbols (≈4.954 bits each).
|
||||
const CODE_ALPHABET: &[u8] = b"23456789ABCDEFGHJKMNPQRSTUVWXYZ";
|
||||
|
||||
/// Number of alphabet symbols in a generated code (excluding group separators).
|
||||
/// 9 symbols × log2(31) ≈ 44.6 bits — comfortably above the 40-bit target.
|
||||
const CODE_SYMBOLS: usize = 9;
|
||||
|
||||
/// Symbols per visual group (the code is rendered as hyphen-separated groups).
|
||||
const CODE_GROUP_SIZE: usize = 3;
|
||||
|
||||
/// Draw a single uniformly-distributed symbol from [`CODE_ALPHABET`] using a
|
||||
/// CSPRNG, via rejection sampling so every symbol is equally likely (no modulo
|
||||
/// bias). 31 is not a power of two, so we reject draws in the biased tail.
|
||||
fn random_symbol() -> u8 {
|
||||
let n = CODE_ALPHABET.len() as u32; // 31
|
||||
// Largest multiple of n that fits in a u8 draw space (256); reject above it.
|
||||
let limit = (256 / n) * n; // 248
|
||||
let mut rng = OsRng;
|
||||
loop {
|
||||
let mut buf = [0u8; 1];
|
||||
rng.fill_bytes(&mut buf);
|
||||
let v = buf[0] as u32;
|
||||
if v < limit {
|
||||
return CODE_ALPHABET[(v % n) as usize];
|
||||
}
|
||||
// else: biased tail — draw again.
|
||||
}
|
||||
}
|
||||
|
||||
/// Generate a fresh grouped support code, e.g. `K7P-3MQ-Z9F`. CSPRNG-backed.
|
||||
fn generate_code_string() -> String {
|
||||
let mut out = String::with_capacity(CODE_SYMBOLS + CODE_SYMBOLS / CODE_GROUP_SIZE);
|
||||
for i in 0..CODE_SYMBOLS {
|
||||
if i > 0 && i % CODE_GROUP_SIZE == 0 {
|
||||
out.push('-');
|
||||
}
|
||||
out.push(random_symbol() as char);
|
||||
}
|
||||
out
|
||||
}
|
||||
|
||||
/// A support session code
|
||||
#[derive(Debug, Clone, Serialize)]
|
||||
pub struct SupportCode {
|
||||
@@ -67,15 +125,16 @@ impl SupportCodeManager {
|
||||
}
|
||||
}
|
||||
|
||||
/// Generate a unique 6-digit code
|
||||
/// Generate a unique high-entropy support code (see module docs).
|
||||
///
|
||||
/// Draws CSPRNG-backed grouped codes (`XXX-XXX-XXX`, ≈44.6 bits) until one is
|
||||
/// not already live in the in-memory map. With a 31^9 code space the collision
|
||||
/// probability is negligible; the loop only guards against the (astronomically
|
||||
/// unlikely) duplicate.
|
||||
async fn generate_unique_code(&self) -> String {
|
||||
let codes = self.codes.read().await;
|
||||
let mut rng = rand::thread_rng();
|
||||
|
||||
loop {
|
||||
let code: u32 = rng.gen_range(100000..999999);
|
||||
let code_str = code.to_string();
|
||||
|
||||
let code_str = generate_code_string();
|
||||
if !codes.contains_key(&code_str) {
|
||||
return code_str;
|
||||
}
|
||||
@@ -142,7 +201,12 @@ impl SupportCodeManager {
|
||||
}
|
||||
}
|
||||
|
||||
/// Mark a code as connected
|
||||
/// Mark a code as connected.
|
||||
///
|
||||
/// Superseded by [`SupportCodeManager::consume_for_bind`] for the single-use
|
||||
/// bind path (Task 4). Retained for non-bind callers; not used on the agent
|
||||
/// bind path any longer.
|
||||
#[allow(dead_code)]
|
||||
pub async fn mark_connected(
|
||||
&self,
|
||||
code: &str,
|
||||
@@ -158,6 +222,40 @@ impl SupportCodeManager {
|
||||
}
|
||||
}
|
||||
|
||||
/// Atomically CONSUME a code for a first-time agent bind (single-use, Task 4).
|
||||
///
|
||||
/// This is the single-use gate for the in-memory layer. Under the write lock,
|
||||
/// it accepts the code ONLY if it is currently `Pending` (never used), flips
|
||||
/// it to `Connected`, and records the binding client. Any other state
|
||||
/// (`Connected` — already bound, `Completed`, `Cancelled`, or a nonexistent
|
||||
/// code) is rejected. Because the transition happens while holding the write
|
||||
/// lock, two concurrent presenters of the same code race for the single
|
||||
/// `Pending → Connected` transition: exactly one wins, the loser is rejected.
|
||||
///
|
||||
/// Returns `true` if the caller consumed the code (and may proceed to bind),
|
||||
/// `false` if the code was not available for consumption.
|
||||
///
|
||||
/// NOTE: the preview route (`validate_code`) deliberately does NOT call this —
|
||||
/// previewing a code must never consume it. Only the agent bind path does.
|
||||
pub async fn consume_for_bind(
|
||||
&self,
|
||||
code: &str,
|
||||
client_name: Option<String>,
|
||||
client_machine: Option<String>,
|
||||
) -> bool {
|
||||
let mut codes = self.codes.write().await;
|
||||
match codes.get_mut(code) {
|
||||
Some(support_code) if support_code.status == CodeStatus::Pending => {
|
||||
support_code.status = CodeStatus::Connected;
|
||||
support_code.client_name = client_name;
|
||||
support_code.client_machine = client_machine;
|
||||
support_code.connected_at = Some(Utc::now());
|
||||
true
|
||||
}
|
||||
_ => false,
|
||||
}
|
||||
}
|
||||
|
||||
/// Link a support code to an actual WebSocket session
|
||||
pub async fn link_session(&self, code: &str, real_session_id: Uuid) {
|
||||
let mut codes = self.codes.write().await;
|
||||
@@ -248,7 +346,11 @@ impl SupportCodeManager {
|
||||
codes.get(code).cloned()
|
||||
}
|
||||
|
||||
/// Get the status of a code as a string (for auth checks)
|
||||
/// Get the status of a code as a string (for auth checks).
|
||||
///
|
||||
/// No longer used on the agent bind path (replaced by the atomic
|
||||
/// `consume_for_bind` single-use gate, Task 4); retained for diagnostics.
|
||||
#[allow(dead_code)]
|
||||
pub async fn get_status(&self, code: &str) -> Option<String> {
|
||||
let codes = self.codes.read().await;
|
||||
codes.get(code).map(|c| match c.status {
|
||||
@@ -265,3 +367,113 @@ impl Default for SupportCodeManager {
|
||||
Self::new()
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
|
||||
#[test]
|
||||
fn generated_code_has_expected_shape() {
|
||||
// XXX-XXX-XXX: 9 symbols + 2 hyphens = 11 chars.
|
||||
let code = generate_code_string();
|
||||
assert_eq!(code.len(), CODE_SYMBOLS + 2);
|
||||
let parts: Vec<&str> = code.split('-').collect();
|
||||
assert_eq!(parts.len(), CODE_SYMBOLS / CODE_GROUP_SIZE);
|
||||
for p in parts {
|
||||
assert_eq!(p.len(), CODE_GROUP_SIZE);
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn generated_code_uses_only_unambiguous_alphabet() {
|
||||
// No 0/O/1/I/L; every non-hyphen char is in CODE_ALPHABET.
|
||||
for _ in 0..2_000 {
|
||||
let code = generate_code_string();
|
||||
for c in code.chars().filter(|c| *c != '-') {
|
||||
assert!(
|
||||
CODE_ALPHABET.contains(&(c as u8)),
|
||||
"char {:?} not in unambiguous alphabet",
|
||||
c
|
||||
);
|
||||
assert!(
|
||||
!matches!(c, '0' | 'O' | '1' | 'I' | 'L'),
|
||||
"ambiguous char {:?} leaked into a code",
|
||||
c
|
||||
);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn generated_codes_are_distinct_in_practice() {
|
||||
// With ~44 bits of entropy, 1000 draws should be unique.
|
||||
use std::collections::HashSet;
|
||||
let mut seen = HashSet::new();
|
||||
for _ in 0..1_000 {
|
||||
assert!(seen.insert(generate_code_string()), "unexpected collision");
|
||||
}
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn consume_for_bind_is_single_use() {
|
||||
let mgr = SupportCodeManager::new();
|
||||
let code = mgr
|
||||
.create_code(CreateCodeRequest {
|
||||
technician_id: None,
|
||||
technician_name: Some("tech".to_string()),
|
||||
})
|
||||
.await
|
||||
.code;
|
||||
|
||||
// First bind consumes the code.
|
||||
assert!(
|
||||
mgr.consume_for_bind(&code, Some("agent".into()), Some("a1".into()))
|
||||
.await
|
||||
);
|
||||
// Second presenter is rejected — single use.
|
||||
assert!(
|
||||
!mgr.consume_for_bind(&code, Some("agent2".into()), Some("a2".into()))
|
||||
.await
|
||||
);
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn consume_for_bind_rejects_unknown_code() {
|
||||
let mgr = SupportCodeManager::new();
|
||||
assert!(!mgr.consume_for_bind("NOP-E00-000", None, None).await);
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn consume_for_bind_rejects_cancelled_code() {
|
||||
let mgr = SupportCodeManager::new();
|
||||
let code = mgr
|
||||
.create_code(CreateCodeRequest {
|
||||
technician_id: None,
|
||||
technician_name: Some("tech".to_string()),
|
||||
})
|
||||
.await
|
||||
.code;
|
||||
assert!(mgr.cancel_code(&code).await);
|
||||
// A cancelled code is not Pending → cannot be consumed.
|
||||
assert!(!mgr.consume_for_bind(&code, None, None).await);
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn preview_validate_does_not_consume() {
|
||||
let mgr = SupportCodeManager::new();
|
||||
let code = mgr
|
||||
.create_code(CreateCodeRequest {
|
||||
technician_id: None,
|
||||
technician_name: Some("tech".to_string()),
|
||||
})
|
||||
.await
|
||||
.code;
|
||||
|
||||
// Previewing the code many times must not consume it...
|
||||
for _ in 0..5 {
|
||||
assert!(mgr.validate_code(&code).await.valid);
|
||||
}
|
||||
// ...so a first real bind still succeeds.
|
||||
assert!(mgr.consume_for_bind(&code, None, None).await);
|
||||
}
|
||||
}
|
||||
|
||||
@@ -1,7 +1,8 @@
|
||||
# v2 Secure Session Core — Implementation Plan
|
||||
|
||||
> Spec created: 2026-05-29
|
||||
> Status: in progress — Tasks 1-3 DONE 2026-05-29 (Task 3 code-reviewed APPROVED). Viewer-token authz
|
||||
> Status: in progress — Tasks 1-4 IMPLEMENTED 2026-05-29 (Task 4 self-reviewed, pending Code Review;
|
||||
> Tasks 1-3 code-reviewed APPROVED). Task 4 completes the KEYSTONE (secure auth/session core). Viewer-token authz
|
||||
> STRENGTH split IMPLEMENTED 2026-05-29 (self-reviewed; no Rust toolchain on this machine — not yet
|
||||
> `cargo check`-verified; pending Code Review). This was the REQUIRED Phase-1-exit follow-up: the gate
|
||||
> previously used `view` (held by EVERY default role incl. `viewer`) but a viewer token granted input
|
||||
@@ -179,7 +180,59 @@ Reference: audit Pass E (`reports/2026-05-29-gc-audit.md` §"Pass 5"); `relay/mo
|
||||
|
||||
---
|
||||
|
||||
## Task 4 (KEYSTONE): Working rate limiting + single-use support codes
|
||||
## Task 4 (KEYSTONE) [IMPLEMENTED 2026-05-29 — self-reviewed; no Rust toolchain on this machine, not yet `cargo check`-verified; pending Code Review]: Working rate limiting + single-use support codes
|
||||
|
||||
> [IMPLEMENTED] Closes the keystone (Tasks 1–4). Three parts:
|
||||
>
|
||||
> A. RATE LIMITING — replaced the non-compiling tower_governor layer with a small
|
||||
> self-contained in-memory limiter (`middleware/rate_limit.rs`): a per-IP
|
||||
> fixed-window `RateLimiter` (`Mutex<HashMap<IpAddr, Window>>`, no new dep) +
|
||||
> a per-IP consecutive-failure `FailureLockout`, bundled as `RateLimitState`
|
||||
> in `AppState`. Keyed by `ConnectInfo<SocketAddr>` IP (same source the relay
|
||||
> uses); X-Forwarded-For intentionally NOT trusted (proxy-spoofable). 429 with
|
||||
> the standard error envelope on limit. Re-enabled `pub mod rate_limit`. Wired
|
||||
> per-route via `route_layer(from_fn_with_state(...))` onto `POST
|
||||
> /api/auth/login` (8/min/IP), `POST /api/auth/change-password` (5/min/IP), and
|
||||
> `GET /api/codes/:code/validate` (15/min/IP). Named consts for every limit.
|
||||
> LOCKOUT: after 10 consecutive failed code-validations from an IP, that IP is
|
||||
> locked out 15 min; the validate handler reports success/failure into the
|
||||
> lockout, the middleware enforces it BEFORE the handler runs. Unit tests cover
|
||||
> window allow/block/reset, per-IP isolation, and lockout trip/reset/expire
|
||||
> (clock injected, no sleeps).
|
||||
>
|
||||
> B. SINGLE-USE CODES — the agent bind path now CONSUMES the code atomically on
|
||||
> first bind. In-memory: new `SupportCodeManager::consume_for_bind` accepts
|
||||
> ONLY a `Pending` code and flips it to `Connected` under the write lock (a 2nd
|
||||
> presenter loses the race → rejected). This replaces the v1 pre-upgrade check
|
||||
> that accepted `pending` OR `connected` (the reusable-code HIGH). DB: new
|
||||
> `db::support_codes::consume_code_for_bind` — a single conditional UPDATE
|
||||
> `... SET consumed_at = NOW(), status='connected' WHERE code=$1 AND consumed_at
|
||||
> IS NULL AND status='pending' AND (expires_at IS NULL OR expires_at > NOW())
|
||||
> RETURNING id`; zero rows ⇒ not consumable. The in-memory consume is
|
||||
> AUTHORITATIVE (the live source of truth); the DB UPDATE is a durable/audit
|
||||
> mirror applied best-effort after it (a missing DB row does not veto a bind the
|
||||
> in-memory layer admitted). To make the durable record meaningful, the portal
|
||||
> `create_code` handler now also inserts the code into `connect_support_codes`.
|
||||
> Validate/preview path is UNCHANGED and explicitly does NOT consume (test
|
||||
> `preview_validate_does_not_consume`).
|
||||
>
|
||||
> C. WIDER CODE — replaced the 6-digit numeric generator with a grouped
|
||||
> base32-style code `XXX-XXX-XXX` (9 symbols over a 31-char UNAMBIGUOUS alphabet
|
||||
> excluding 0/O/1/I/L ≈ 44.6 bits), CSPRNG-backed (`OsRng`, rejection sampling
|
||||
> to avoid modulo bias). The new code (11 chars incl. hyphens) does NOT fit the
|
||||
> `VARCHAR(10)` column from migration 001, so migration `006_widen_support_code.sql`
|
||||
> widens `connect_support_codes.code` AND `connect_sessions.support_code` to
|
||||
> TEXT (idempotent). Unit tests cover shape, charset (no ambiguous chars), and
|
||||
> practical uniqueness.
|
||||
>
|
||||
> DEPS: none added; `tower_governor` REMOVED from Cargo.toml (it never compiled).
|
||||
> No code/secret/support-code value logged on any path. Runtime `sqlx::query`.
|
||||
> Files: `server/src/middleware/rate_limit.rs` (rebuilt), `server/src/middleware/mod.rs`,
|
||||
> `server/src/main.rs` (AppState field + 3 route wirings + create_code DB insert +
|
||||
> validate handler lockout feed), `server/src/support_codes.rs` (new generator +
|
||||
> `consume_for_bind` + tests), `server/src/db/support_codes.rs`
|
||||
> (`consume_code_for_bind`), `server/src/relay/mod.rs` (atomic consume on bind),
|
||||
> `server/migrations/006_widen_support_code.sql` [new], `server/Cargo.toml`.
|
||||
|
||||
Files touched: `server/src/middleware/rate_limit.rs` (rebuild — v1 is non-compiling),
|
||||
`server/src/middleware/mod.rs`, `server/src/api/auth.rs` (login), `server/src/api/` (code validate),
|
||||
|
||||
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