max / makenotwork

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1	//! Handlers triggered by clicking email links, plus the forms that initiate them.
2
3	mod account;
4	mod acknowledge;
5	mod links;
6	mod password;
7
8	use axum::routing::get;
9	use tower_governor::GovernorLayer;
10
11	use crate::{
12	AppState, constants,
13	csrf::{CsrfRouter, post_csrf_skip, with_csrf, with_csrf_skip},
14	helpers::rate_limiter_ms,
15	};
16
17	/// Register email action routes.
18	///
19	/// Returns a `CsrfRouter` so each mutating route MUST declare a CSRF posture,
20	/// the group can no longer be merged into the page tree as a bare `Router` that
21	/// silently skips the envelope (the Run #16/#17 CHRONIC: `/forgot-password`
22	/// rendered a CSRF token it never validated). Postures:
23	/// - `/forgot-password`, auto-validated. It carries no signed-link token, so
24	/// the session CSRF token IS its protection.
25	/// - `/reset-password`, `/confirm-delete`, `/unsubscribe`, CSRF skip: each
26	/// carries HMAC signed-link fields (user/expires/sig) re-validated in the
27	/// handler, which an attacker cannot forge. That signature is the CSRF
28	/// defense; a session token would add nothing for a logged-out email-link
29	/// flow.
30	/// - `/acknowledge/:token`, CSRF skip: the token is an HMAC over the signing
31	/// secret, so holding it is the authorisation, exactly as for the links
32	/// above. The POST records only that a person read a message; there is
33	/// nothing an attacker who already holds the link gains by forging it.
34	/// - `/verify-email`, `/login-link`, GET-only (read-method, no posture).
35	///
36	/// Every route is unauthenticated (reached from email links or pre-login forms)
37	/// so the whole router carries one per-IP auth rate limiter. The tokens are
38	/// 256-bit CSPRNG / HMAC so this was never a brute-force risk, the cap closes
39	/// the abuse/amplification angle. Burst 5 + 500ms replenish comfortably covers
40	/// the legitimate forgot -> reset -> login click sequence (~3 requests).
41	pub(super) fn email_action_routes(limits: constants::RateLimits) -> CsrfRouter<AppState> {
42	let auth_rate_limit = rate_limiter_ms(limits.auth_ms, limits.auth_burst);
43
44	CsrfRouter::new()
45	.route(
46	"/forgot-password",
47	with_csrf(get(password::forgot_password_page).post(password::forgot_password_handler)),
48	)
49	.route(
50	"/reset-password",
51	with_csrf_skip(
52	"signed link: user/expires/sig HMAC re-validated in handler",
53	get(password::reset_password_page).post(password::reset_password_handler),
54	),
55	)
56	.route_get("/verify-email", get(links::verify_email_handler))
57	.route_get("/login-link", get(links::login_link_handler))
58	.route(
59	"/confirm-delete",
60	with_csrf_skip(
61	"signed link: user/expires/sig HMAC re-validated in handler",
62	get(account::confirm_delete_page).post(account::confirm_delete_handler),
63	),
64	)
65	.route(
66	"/unsubscribe",
67	with_csrf_skip(
68	"signed link: sig HMAC verified in handler",
69	get(account::unsubscribe_page).post(account::unsubscribe_handler),
70	),
71	)
72	// The preferences page's own actions. Sessionless like the page, and
73	// authorised by the same signed token, which is re-verified in each
74	// handler; a CSRF cookie would require the login this page exists to
75	// avoid.
76	.route(
77	"/unsubscribe/list",
78	post_csrf_skip(
79	"signed link: sig HMAC verified in handler",
80	account::preferences_toggle,
81	),
82	)
83	.route(
84	"/unsubscribe/all",
85	post_csrf_skip(
86	"signed link: sig HMAC verified in handler",
87	account::preferences_unsubscribe_all,
88	),
89	)
90	.route(
91	"/acknowledge/{token}",
92	with_csrf_skip(
93	"signed link: the token is an HMAC over the signing secret",
94	get(acknowledge::acknowledge_page).post(acknowledge::acknowledge_handler),
95	),
96	)
97	.layer(GovernorLayer::new(auth_rate_limit))
98	}
99