Side B fixes a real security flaw (votes silently falling back to an anonymous actor instead of failing closed when unauthenticated), gates a test-only OAuth bypass behind an explicit env var, adds Secure cookie support and open-redirect hardening with tests, and pins a git dependency by immutable rev instead of a mutable branch — all substantive, lasting improvements. Side A is a correct but narrow bugfix (moving a guard before side effects) with a single test update, valuable but much smaller in scope and impact.
constitution · epochs · watch · epoch 3
comparison
c_abd68b5e771a (tommy-mor) vs c_94135a1c4c58 (tommy-mor)
download prompt · raw event · cmp_8f63c175c7895a
council reasoning
B hardens the auth model (fail-closed vote actor, mock OAuth gate, Secure cookies, tighter return_to sanitization) plus dependency pinning and session-aware nav—broad, lasting security and product design. A is a correct, precise reducer bugfix that drops zero-ratio votes before ensure_item/voted_pairs side effects, but its scope is a single narrow data-integrity edge case.
Side B introduces substantive security hardening across the authentication flow: vote submission now fails closed when no valid session exists, mock OAuth is gated behind an explicit environment flag, Secure cookie attributes are enabled for HTTPS deployments, and return-path sanitization is strengthened with accompanying tests. Side A fixes a real reducer bug by moving the zero-ratio early return ahead of `ensure_item` and `voted_pairs` registration to prevent ghost items and stale voted pairs, but its impact is narrower than the broader authentication and security improvements in Side B.
sides
A — c_abd68b5e771a (tommy-mor)
message
[81de487b] Fix zero-ratio guard in reducer to drop before registering items or pair. Previously the early-return for zero-weight votes happened after ensure_item and voted_pairs.insert, leaving ghost items in the index and the pair incorrectly marked as voted. Move the check to before any side effects. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
diff preview
diff --git a/server/src/reducer.rs b/server/src/reducer.rs
index 6841d35cfc9de2389f340a22b8a45acb335e36c3..0e36979abe0f051493038ff7e652efc7f7a0ac80 100644
--- a/server/src/reducer.rs
+++ b/server/src/reducer.rs
@@ -112,6 +112,10 @@ impl GroupState {
if vote.ratio_right < 0 {
vote.ratio_right = 0;
}
+ if vote.ratio_left == 0 || vote.ratio_right == 0 {
+ // Zero on either side produces no valid edge; drop before registering items or pair.
+ return;
+ }
let a_idx = self.ensure_item(&vote.a);
let b_idx = self.ensure_item(&vote.b);
@@ -121,10 +125,6 @@ impl GroupState {
let w_a = vote.ratio_left as f64;
let w_b = vote.ratio_right as f64;
- if w_a == 0.0 || w_b == 0.0 {
- // Zero on either side produces no valid edge; drop the vote.
- return;
- }
self.add_edge_weight(b_idx, a_idx, w_a);
self.add_edge_weight(a_idx, b_idx, w_b);
diff --git a/server/tests/basic.rs b/server/tests/basic.rs
index cc8c1a0d139f3722ba6ecd13dd001c65be835b67..08159f4a7f0850fd165817a4a1af4f31ced2ad76 100644
--- a/server/tests/basic.rs
+++ b/server/tests/basic.rs
@@ -546,12 +546,10 @@ fn reducer_negative_ratio_clamped_to_zero() {
delegate: Some("00000000-0000-0000-0000-000000000000:test:local/test".to_string()),
thread_tag: "t".to_string(),
});
- // Items are registered, but the zero-clamped vote produces no edges.
- assert_eq!(group.idx_to_item.len(), 2);
- let a_idx = group.item_to_idx[&item_id("https://slug.social/~/t/a")];
- let b_idx = group.item_to_idx[&item_id("https://slug.social/~/t/b")];
- assert!(!group.edges.contains_key(&(a_idx, b_idx)));
- assert!(!group.edges.contains_key(&(b_idx, a_idx)));
+ // Nothing registered: zero-clamped vote is dropped before ensure_item.
+ assert!(group.idx_to_item.is_empty());
+ assert!(group.edges.is_empty());
+ assert!(group.voted_pairs.is_empty());
}
B — c_94135a1c4c58 (tommy-mor)
message
[880eb778] Harden auth: fail-closed votes, mock OAuth gate, Secure cookies. Also show the current alias in the top nav and pin durable by rev. Co-authored-by: Cursor <cursoragent@cursor.com>
diff preview
diff --git a/AGENTS.md b/AGENTS.md
index babb889d6fbfb1fa7176c9e6b7544ae17b61dd2e..6e0fd8ebb65d665c9c1438e3275971d62b98fd95 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -10,11 +10,11 @@ Single Rust web app **`sorter2-server`**: pairwise voting, rank-centrality ranki
- **Bootstrap script**: `./scripts/cursor-env-install.sh` (also run via `.cursor/environment.json` on Cloud Agent boot) installs Playwright Chromium, Babashka, bbin, `clj-paren-repair`, and warms the RocksDB build.
- **Rust 1.88+** is required (`rust-toolchain.toml`). The Cloud Dockerfile and `cursor-env-install.sh` install **rustup** 1.88.0 first so `cargo` works while Playwright/Clojure bootstrap continues. Do not rely on `/usr/local/cargo` (often missing or stale).
-- **RocksDB / `durable`**: Ubuntu’s default `c++` is often **clang** without libc++ headers. Set **`CXX=g++`** and **`RUSTFLAGS="-C linker=g++"`** (or `CC=gcc`) before `cargo build` / `cargo test` — both are set in the bootstrap script and `.cursor/environment.json`.
+- **RocksDB / `durable`**: `durable` is an external git dependency (`tommy-mor/durable`, pinned by rev in `server/Cargo.toml`). Ubuntu’s default `c++` is often **clang** without libc++ headers. Set **`CXX=g++`** and **`RUSTFLAGS="-C linker=g++"`** (or `CC=gcc`) before `cargo build` / `cargo test` — both are set in the bootstrap script and `.cursor/environment.json`.
- **System packages** for builds: `build-essential`, `g++`, `clang`, `libclang-dev`, `pkg-config`, `libssl-dev`, `openjdk-21-jre-headless` (for `reqwest` / OpenSSL, `librocksdb-sys`, `zstd-sys` / bindgen, and **bbin** / Clojure JVM). The bootstrap sets **`JAVA_HOME`** when Java is present.
- **Clojure CLI 1.12.0.1530** (used in CI): install from https://clojure.org/guides/install_clojure — needed for `./scripts/clj-test.sh` / Kaocha tests.
- **Babashka / bbin / clj-paren-repair**: installed by `cursor-env-install.sh` into `~/.local/bin` (bb tasks in `bb.edn`, delimiter repair for Clojure edits).
-- **Playwright** (Spel browser tests in `test/vote_compare.clj`): Chromium via `clojure -M -e "(com.microsoft.playwright.CLI/main ...)"` — run once after clone or use the bootstrap script.
+- **Playwright** (Spel browser tests in `test/vote_compare.clj` / `test/auth_login.clj`): Chromium via `clojure -M -e "(com.microsoft.playwright.CLI/main ...)"` — run once after clone or use the bootstrap script.
### Commands (see also `TEST.sh`)
@@ -34,13 +34,17 @@ Environment variables (defaults in `server/src/state.rs`):
- `PORT` — default `8080`
- `SORTER2_DATA_DIR` — default `./data` (created on startup)
- `SORTER2_EVENT_LOG` — default `{data_dir}/events.jsonl`
+- `SORTER2_BASE_URL` — public origin (also drives Secure cookies when `https://`)
+- `GITHUB_CLIENT_ID` / `GITHUB_CLIENT_SECRET` — GitHub OAuth (optional; login disabled if unset)
+- `SORTER2_ALLOW_MOCK_OAUTH=1` — allow `mock_user` on `/auth/github` (tests only)
Health check: `GET /healthz` → `ok`.
-Core UI flow: `POST /ui` with form field `__rpc__` (JSON). Example vote:
+Core UI flow: `POST /ui` with form field `__rpc__` (JSON). Votes require a session cookie (sign in via `/login`). Example vote:
```bash
curl -sf -X POST http://127.0.0.1:8080/ui \
+ --cookie "sorter2_session=..." \
--data-urlencode '__rpc__={"action":"record_vote","a":"alpha","b":"beta","ratio_left":2,"ratio_right":1}'
```
diff --git a/Cargo.lock b/Cargo.lock
index aa02997ad85777195f135bfd9456bcee0fc9a590..1f8690f3e486d099577a32c2ece48caf57ea7160 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -414,7 +414,7 @@ dependencies = [
[[package]]
name = "durable"
version = "0.2.0"
-source = "git+https://github.com/tommy-mor/durable.git?branch=main#a6c14eaa809693140eea0c22b07ef24d8e74adaf"
+source = "git+https://github.com/tommy-mor/durable.git?rev=a6c14eaa809693140eea0c22b07ef24d8e74adaf#a6c14eaa809693140eea0c22b07ef24d8e74adaf"
dependencies = [
"ciborium",
"durable-derive",
@@ -426,7 +426,7 @@ dependencies = [
[[package]]
name = "durable-derive"
version = "0.2.0"
-source = "git+https://github.com/tommy-mor/durable.git?branch=main#a6c14eaa809693140eea0c22b07ef24d8e74adaf"
+source = "git+https://github.com/tommy-mor/durable.git?rev=a6c14eaa809693140eea0c22b07ef24d8e74adaf#a6c14eaa809693140eea0c22b07ef24d8e74adaf"
dependencies = [
"proc-macro2",
"quote",
diff --git a/server/Cargo.toml b/server/Cargo.toml
index dfa39beddecfa37dcdeaa602cb30f4b547528fbb..bd88687fb0ba47d68f2c08eb5e11d0e08b7c4398 100644
--- a/server/Cargo.toml
+++ b/server/Cargo.toml
@@ -25,7 +25,7 @@ futures-util = { version = "0.3", default-features = false, features = ["std"] }
rand = "0.8"
urlencoding = "2"
url = "2"
-durable = { git = "https://github.com/tommy-mor/durable.git", branch = "main" }
+durable = { git = "https://github.com/tommy-mor/durable.git", rev = "a6c14eaa809693140eea0c22b07ef24d8e74adaf" }
[dev-dependencies]
reqwest = { version = "0.12", features = ["json"] }
diff --git a/server/src/api/ui_html.rs b/server/src/api/ui_html.rs
index b86581b1f337650564274254d840e8a75b49524d..9da62ffbed07eb28729aa3160bf33b07ce0d7945 100644
--- a/server/src/api/ui_html.rs
+++ b/server/src/api/ui_html.rs
@@ -71,10 +71,16 @@ pub async fn post_ui_html(
return resp;
}
let parent = parent_from_scope(&scope);
- let actor = resolve_vote_actor(
+ let actor = match resolve_vote_actor(
state.projection_store.db(),
session_id_from_jar(&jar).as_deref(),
- );
+ ) {
+ Ok(actor) => actor,
+ Err(_) => {
+ return vote_auth_redirect(&state, &jar)
+ .unwrap_or_else(|| login_redirect_js().into_response());
+ }
+ };
if let Err(e) = state
.record_vote(&parent, &a, &b, ratio_left, ratio_right, &actor)
.await
diff --git a/server/src/auth/config.rs b/server/src/auth/config.rs
index a1f042c655bf3e5234eeb87a7d889f64592807fb..a5976af9a52ea207b35ae87bd1fe927c47a477ca 100644
--- a/server/src/auth/config.rs
+++ b/server/src/auth/config.rs
@@ -1,9 +1,42 @@
pub const AUTH_RETURN_COOKIE: &str = "sorter2_auth_return";
+/// Allow `mock_user` on `/auth/github` (test harness only).
+pub fn mock_oauth_allowed() -> bool {
+ matches!(
+ std::env::var("SORTER2_ALLOW_MOCK_OAUTH").as_deref(),
+ Ok("1") | Ok("true") | Ok("TRUE")
+ )
+}
+
+/// Set the Secure flag on auth cookies when serving over HTTPS.
+pub fn cookies_secure() -> bool {
+ std::env::var("SORTER2_BASE_URL")
+ .map(|u| u.starts_with("https://"))
+ .unwrap_or(false)
+}
+
pub fn sanitize_return_to(raw: &str) -> String {
let s = raw.trim();
- if s.is_empty() || !s.starts_with('/') || s.starts_with("//") {
+ if s.is_empty() || !s.starts_with('/') || s.starts_with("//") || s.starts_with("/\\") {
+ return "/".to_string();
+ }
+ // Reject scheme-relative and protocol-smuggling forms.
+ if s.contains("://") || s.contains('\\') {
return "/".to_string();
}
s.to_string()
}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn sanitize_return_to_blocks_open_redirects() {
+ assert_eq!(sanitize_return_to(""), "/");
+ assert_eq!(sanitize_return_to("//evil.com"), "/");
+ assert_eq!(sanitize_return_to("/\\evil.com"), "/");
+ assert_eq!(sanitize_return_to("https://evil.com"), "/");
+ assert_eq!(sanitize_return_to("/vote?parent=x"), "/vote?parent=x");
+ }
+}
diff --git a/server/src/auth/mod.rs b/server/src/auth/mod.rs
index 5ed535ba199fa736f0048c32623b14c3b1e5de2d..d4a85ef52c15dc35148e4c743f0d646cbbdb056d 100644
--- a/server/src/auth/mod.rs
+++ b/server/src/auth/mod.rs
@@ -26,7 +26,7 @@ use crate::{
ui_action::UI_RPC_FIELD,
};
-pub use session::{resolve_vote_actor, session_id_from_jar, VoteActor};
+pub use session::{nav_pseudonym, resolve_vote_actor, session_id_from_jar, VoteActor};
pub fn base_url_from_env(port: u16) -> String {
std::env::var("SORTER2_BASE_URL")
@@ -168,6 +168,10 @@ pub async fn login_page(
"login · sorter2",
login_body(session.as_ref(), &aliases, &providers),
state.views.get_views("/login"),
+ session
+ .as_ref()
+ .filter(|s| !s.pseudonym.trim().is_empty())
+ .map(|s| s.pseudonym.as_str()),
);
(jar, Html(markup.into_string())).into_response()
}
@@ -222,6 +226,7 @@ pub async fn alias_page(
"choose alias · sorter2",
body,
state.views.get_views("/login/alias"),
+ None,
)
.into_string(),
)
@@ -237,7 +242,12 @@ pub async fn github_start(
.ok_or(StatusCode::SERVICE_UNAVAILABLE)?;
let return_to = return_from_query_or_jar(&jar, query.return_to.as_deref());
let state_token = session::new_oauth_state();
- let url = oauth::authorize_url(&cfg, &state_token, query.mock_user.as_deref());
+ let mock_user = if config::mock_oauth_allowed() {
+ query.mock_user.as_deref()
+ } else {
+ None
+ };
+ let url = oauth::authorize_url(&cfg, &state_token, mock_user);
let jar = jar
.add(session::oauth_state_cookie_value(&state_token))
.add(session::auth_return_cookie_value(&return_to));
diff --git a/server/src/auth/session.rs b/server/src/auth/session.rs
index 09659240b9455c6fca12db5652e1d31cf8c2acfc..41df030ded3abcafc0ab3887ab769adf103f9aa0 100644
--- a/server/src/auth/session.rs
+++ b/server/src/auth/session.rs
@@ -5,7 +5,7 @@ use durable::{Db, Durability};
use rand::Rng;
use crate::{
- auth::config::AUTH_RETURN_COOKIE,
+ auth::config::{self, AUTH_RETURN_COOKIE},
fetch::now_ms,
identity::{DEFAULT_ACTOR_UUID, DEFAULT_PSEUDONYM},
storage_dto::{SessionDataV1, SESSION_DATA_VERSION},
@@ -37,6 +37,7 @@ pub struct VoteActor {
}
impl VoteActor {
+ /// Test / bench helper: seed votes as the default pseudonym without a session.
pub fn anon() -> Self {
Self {
pseudonym: DEFAULT_PSEUDONYM.to_string(),
@@ -70,20 +71,51 @@ fn hex_encode(bytes: &[u8]) -> String {
bytes.iter().map(|b| format!("{b:02x}")).collect()
}
-pub fn resolve_vote_actor(db: &Db, session_id: Option<&str>) -> VoteActor {
- let Some(session_id) = session_id else {
- return VoteActor::anon();
- };
- let Ok(Some(session)) = load_session(db, session_id) else {
- return VoteActor::anon();
- };
- if session.expires_at <= now_ms() {
- return VoteActor::anon();
+fn build_cookie(name: &'static str, value: String) -> Cookie<'static> {
+ let mut builder = Cookie::build((name, value))
+ .http_only(true)
+ .same_site(SameSite::Lax)
+ .path("/");
+ if config::cookies_secure() {
+ builder = builder.secure(true);
+ }
+ builder.build()
+}
+
+fn clear_cookie(name: &'static str) -> Cookie<'static> {
+ let mut builder = Cookie::build((name, ""))
+ .http_only(true)
+ .same_site(SameSite::Lax)
+ .path("/")
+ .removal();
+ if config::cookies_secure() {
+ builder = builder.secure(true);
+ }
+ builder.build()
+}
+
+/// Resolve the vote actor from a live session. Fail-closed: never falls back to anon.
+pub fn resolve_vote_actor(db: &Db, session_id: Option<&str>) -> Result<VoteActor, &'static str> {
+ let session_id = session_id.ok_or("sign in to vote")?;
+ let session = load_valid_session(db, session_id).ok_or("session expired")?;
+ if !session_has_pseudonym(&session) {
+ return Err("choose an alias first");
}
let trust_weight = user_trust_weight(db, &session.uuid).unwrap_or(1.0);
- VoteActor {
+ Ok(VoteActor {
pseudonym: session.current_pseudonym,
trust_weight,
+ })
+}
+
+/// Display name for the top nav, if any session is active.
+pub fn nav_pseudonym(db: &Db, jar: &CookieJar) -> Option<String> {
+ let sessio
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