impr(proxy): Decouple ip_allowlist from the CancelClosure (#10199)

This PR removes the direct dependency of the IP allowlist from
CancelClosure, allowing for more scalable and flexible IP restrictions
and enabling the future use of Redis-based CancelMap storage.

Changes:
- Introduce a new BackendAuth async trait that retrieves the IP
allowlist through existing authentication methods;
- Improve cancellation error handling by instrument() async
cancel_sesion() rather than dropping it.
- Set and store IP allowlist for SCRAM Proxy to consistently perform IP
allowance check
 
 Relates to #9660

proxy/src/auth/backend/console_redirect.rs

@@ -1,16 +1,18 @@
 use async_trait::async_trait;
 use postgres_client::config::SslMode;
 use pq_proto::BeMessage as Be;
+use std::fmt;
 use thiserror::Error;
 use tokio::io::{AsyncRead, AsyncWrite};
 use tracing::{info, info_span};
 
-use super::ComputeCredentialKeys;
+use super::{ComputeCredentialKeys, ControlPlaneApi};
+use crate::auth::backend::{BackendIpAllowlist, ComputeUserInfo};
 use crate::auth::IpPattern;
 use crate::cache::Cached;
 use crate::config::AuthenticationConfig;
 use crate::context::RequestContext;
-use crate::control_plane::{self, CachedNodeInfo, NodeInfo};
+use crate::control_plane::{self, client::cplane_proxy_v1, CachedNodeInfo, NodeInfo};
 use crate::error::{ReportableError, UserFacingError};
 use crate::proxy::connect_compute::ComputeConnectBackend;
 use crate::stream::PqStream;
@@ -31,6 +33,13 @@ pub(crate) enum ConsoleRedirectError {
 #[derive(Debug)]
 pub struct ConsoleRedirectBackend {
     console_uri: reqwest::Url,
+    api: cplane_proxy_v1::NeonControlPlaneClient,
+}
+
+impl fmt::Debug for cplane_proxy_v1::NeonControlPlaneClient {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "NeonControlPlaneClient")
+    }
 }
 
 impl UserFacingError for ConsoleRedirectError {
@@ -71,9 +80,24 @@ pub(crate) fn new_psql_session_id() -> String {
     hex::encode(rand::random::<[u8; 8]>())
 }
 
+#[async_trait]
+impl BackendIpAllowlist for ConsoleRedirectBackend {
+    async fn get_allowed_ips(
+        &self,
+        ctx: &RequestContext,
+        user_info: &ComputeUserInfo,
+    ) -> auth::Result<Vec<auth::IpPattern>> {
+        self.api
+            .get_allowed_ips_and_secret(ctx, user_info)
+            .await
+            .map(|(ips, _)| ips.as_ref().clone())
+            .map_err(|e| e.into())
+    }
+}
+
 impl ConsoleRedirectBackend {
-    pub fn new(console_uri: reqwest::Url) -> Self {
-        Self { console_uri }
+    pub fn new(console_uri: reqwest::Url, api: cplane_proxy_v1::NeonControlPlaneClient) -> Self {
+        Self { console_uri, api }
     }
 
     pub(crate) async fn authenticate(

proxy/src/auth/backend/mod.rs

@@ -16,7 +16,9 @@ use tokio::io::{AsyncRead, AsyncWrite};
 use tracing::{debug, info, warn};
 
 use crate::auth::credentials::check_peer_addr_is_in_list;
-use crate::auth::{self, validate_password_and_exchange, AuthError, ComputeUserInfoMaybeEndpoint};
+use crate::auth::{
+    self, validate_password_and_exchange, AuthError, ComputeUserInfoMaybeEndpoint, IpPattern,
+};
 use crate::cache::Cached;
 use crate::config::AuthenticationConfig;
 use crate::context::RequestContext;
@@ -131,7 +133,7 @@ pub(crate) struct ComputeUserInfoNoEndpoint {
     pub(crate) options: NeonOptions,
 }
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Default)]
 pub(crate) struct ComputeUserInfo {
     pub(crate) endpoint: EndpointId,
     pub(crate) user: RoleName,
@@ -244,6 +246,15 @@ impl AuthenticationConfig {
     }
 }
 
+#[async_trait::async_trait]
+pub(crate) trait BackendIpAllowlist {
+    async fn get_allowed_ips(
+        &self,
+        ctx: &RequestContext,
+        user_info: &ComputeUserInfo,
+    ) -> auth::Result<Vec<auth::IpPattern>>;
+}
+
 /// True to its name, this function encapsulates our current auth trade-offs.
 /// Here, we choose the appropriate auth flow based on circumstances.
 ///
@@ -256,7 +267,7 @@ async fn auth_quirks(
     allow_cleartext: bool,
     config: &'static AuthenticationConfig,
     endpoint_rate_limiter: Arc<EndpointRateLimiter>,
-) -> auth::Result<ComputeCredentials> {
+) -> auth::Result<(ComputeCredentials, Option<Vec<IpPattern>>)> {
     // If there's no project so far, that entails that client doesn't
     // support SNI or other means of passing the endpoint (project) name.
     // We now expect to see a very specific payload in the place of password.
@@ -315,7 +326,7 @@ async fn auth_quirks(
     )
     .await
     {
-        Ok(keys) => Ok(keys),
+        Ok(keys) => Ok((keys, Some(allowed_ips.as_ref().clone()))),
         Err(e) => {
             if e.is_password_failed() {
                 // The password could have been changed, so we invalidate the cache.
@@ -385,7 +396,7 @@ impl<'a> Backend<'a, ComputeUserInfoMaybeEndpoint> {
         allow_cleartext: bool,
         config: &'static AuthenticationConfig,
         endpoint_rate_limiter: Arc<EndpointRateLimiter>,
-    ) -> auth::Result<Backend<'a, ComputeCredentials>> {
+    ) -> auth::Result<(Backend<'a, ComputeCredentials>, Option<Vec<IpPattern>>)> {
         let res = match self {
             Self::ControlPlane(api, user_info) => {
                 debug!(
@@ -394,7 +405,7 @@ impl<'a> Backend<'a, ComputeUserInfoMaybeEndpoint> {
                     "performing authentication using the console"
                 );
 
-                let credentials = auth_quirks(
+                let (credentials, ip_allowlist) = auth_quirks(
                     ctx,
                     &*api,
                     user_info,
@@ -404,7 +415,7 @@ impl<'a> Backend<'a, ComputeUserInfoMaybeEndpoint> {
                     endpoint_rate_limiter,
                 )
                 .await?;
-                Backend::ControlPlane(api, credentials)
+                Ok((Backend::ControlPlane(api, credentials), ip_allowlist))
             }
             Self::Local(_) => {
                 return Err(auth::AuthError::bad_auth_method("invalid for local proxy"))
@@ -413,7 +424,7 @@ impl<'a> Backend<'a, ComputeUserInfoMaybeEndpoint> {
 
         // TODO: replace with some metric
         info!("user successfully authenticated");
-        Ok(res)
+        res
     }
 }
 
@@ -441,6 +452,24 @@ impl Backend<'_, ComputeUserInfo> {
     }
 }
 
+#[async_trait::async_trait]
+impl BackendIpAllowlist for Backend<'_, ()> {
+    async fn get_allowed_ips(
+        &self,
+        ctx: &RequestContext,
+        user_info: &ComputeUserInfo,
+    ) -> auth::Result<Vec<auth::IpPattern>> {
+        let auth_data = match self {
+            Self::ControlPlane(api, ()) => api.get_allowed_ips_and_secret(ctx, user_info).await,
+            Self::Local(_) => Ok((Cached::new_uncached(Arc::new(vec![])), None)),
+        };
+
+        auth_data
+            .map(|(ips, _)| ips.as_ref().clone())
+            .map_err(|e| e.into())
+    }
+}
+
 #[async_trait::async_trait]
 impl ComputeConnectBackend for Backend<'_, ComputeCredentials> {
     async fn wake_compute(
@@ -786,7 +815,7 @@ mod tests {
         .await
         .unwrap();
 
-        assert_eq!(creds.info.endpoint, "my-endpoint");
+        assert_eq!(creds.0.info.endpoint, "my-endpoint");
 
         handle.await.unwrap();
     }