Token Leakage in Actix with Cockroachdb

Token leakage in an Actix application using CockroachDB typically occurs when authentication tokens, session identifiers, or API keys are inadvertently exposed in logs, error messages, or through insecure data handling between the Actix runtime and the database layer. Because CockroachDB supports distributed SQL and often serves as a backend for stateful services, tokens may be present in query strings, connection parameters, or ORM entity mappings. If these values are logged at DEBUG or INFO levels, serialized into error responses, or reflected in API outputs, they become accessible to unauthorized parties.

Actix-web does not automatically sanitize data passed to or from database drivers. If a developer binds a token value into a SQL query via string interpolation or constructs dynamic queries, the token may appear in query logs on the CockroachDB side or in Actix response payloads when errors bubble up. For example, including a bearer token in a header and then constructing a SQL string like format!("SELECT * FROM sessions WHERE token = '{}'", token) can expose the token in logs if the query fails or is logged by the database.

The combination increases risk because CockroachDB’s wire protocol and storage layer can retain query metadata, and Actix applications often run in clustered or multithreaded environments where logs are aggregated centrally. If an attacker gains access to application logs, Kubernetes event streams, or database audit trails, they can reconstruct valid tokens. This violates the principle of least privilege and may enable horizontal privilege escalation across service boundaries, a pattern commonly flagged as BOLA/IDOR in middleBrick scans.

Moreover, serialization formats used to marshal data between Actix extractors and CockroachDB rows can inadvertently surface tokens. For instance, if a struct intended for database insertion includes a field tagged as #[serde(skip_serializing)] but is later printed for debugging without the same guard, the token may appear in console output or trace data. middleBrick’s Data Exposure and Unsafe Consumption checks specifically flag such insecure handling by correlating runtime responses with OpenAPI specifications and detecting sensitive data in unauthenticated endpoints.

To contextualize within real-world attack patterns, token leakage here aligns with OWASP API Top 10 A07:2021 — Identification and Authentication Failures, and can intersect with PCI-DSS controls around credential exposure. middleBrick’s LLM/AI Security module does not test this vector directly, but its Inventory Management and Property Authorization checks can identify endpoints where tokens are accepted as input without proper validation or authorization, providing prioritized remediation guidance to tighten data handling between Actix and CockroachDB.

Remediation focuses on ensuring tokens are never interpolated into SQL strings, are omitted from logs, and are handled through typed, parameterized interactions. Use prepared statements with strongly typed structs and avoid raw formatting macros when constructing queries that involve authentication material.

// Unsafe: token interpolated into query string
// let query = format!("UPDATE tokens SET used = true WHERE value = '{}'", token);

// Safe: parameterized query using sqlx with CockroachDB
use sqlx::postgres::PgPool;
use sqlx::FromRow;

#[derive(FromRow, Debug)]
struct TokenRecord {
    id: i32,
    #[sqlx(rename = "token")]
    value: String,
    used: bool,
}

async fn mark_token_used(pool: &PgPool, token: &str) -> Result<(), sqlx::Error> {
    sqlx::query_as!(TokenRecord, "UPDATE tokens SET used = true WHERE value = $1 RETURNING id, token, used", token)
        .fetch_one(pool)
        .await?;
    Ok(())
}

Ensure logging configurations in Actix exclude sensitive fields. For example, configure the tracing subscriber to filter fields named token, api_key, or authorization at the DEBUG level.

// In main.rs or logging initialization
use tracing_subscriber::filter::LevelFilter;
use tracing_subscriber::EnvFilter;

fn init_logger() {
    let filter = EnvFilter::builder()
        .with_default_directive(LevelFilter::INFO.into())
        .from_filter_str("info,actix_web=info,tower_http=info,sqlx=warn")
        .unwrap();
    tracing_subscriber::fmt()
        .with_env_filter(filter)
        .without_time()
        .init();
}

Apply serde attributes to prevent token serialization in responses or debug output.

use serde::{Serialize, Deserialize};

#[derive(Serialize, Deserialize, Debug)]
pub struct Session {
    pub user_id: i32,
    #[serde(skip_serializing)]
    pub access_token: String,
    #[serde(skip_deserializing)]
    pub refresh_token: String,
}

Leverage middleware to strip or mask sensitive headers before they reach logging or error handlers.

// In Actix middleware to redact tokens
use actix_web::{dev::{ServiceRequest, ServiceResponse}, Error};
use actix_web::middleware::Next;

pub struct TokenRedactor;

impl actix_web::middleware::Transform for TokenRedactor {
    type Response = ServiceResponse;
    type InitError = ();
    type Transform = RedactorMiddleware;
    type Future = std::future::Ready>;

    fn new_transform(&self, service: S) -> Self::Future {
        std::future::ready(Ok(RedactorMiddleware { service }))
    }
}

pub struct RedactorMiddleware {
    service: S,
}

impl actix_web::dev::Service for RedactorMiddleware
where
    S: actix_web::dev::Service,
{
    type Response = ServiceResponse;
    type Error = Error;
    type Future = std::pin::Pin>>>;

    fn poll_ready(&mut self, cx: &mut std::task::Context<'_>) -> std::task::Poll> {
        self.service.poll_ready(cx)
    }

    fn call(&mut self, req: ServiceRequest) -> Self::Future {
        // Redact token from headers in logs
        let headers = req.headers();
        if let Some(token) = headers.get("Authorization") {
            tracing::debug!(redacted_authorization = "***", "header redacted");
        }
        let fut = self.service.call(req);
        Box::pin(async move {
            let res = fut.await?;
            Ok(res)
        })
    }
}