Api Key Exposure in Echo Go with Cockroachdb

When building HTTP services in Go with the Echo framework and CockroachDB as the backend, developers often embed database credentials and service-specific API keys in configuration files or environment variables. If these values are inadvertently exposed through debug endpoints, verbose error messages, or improper logging, the combination of Echo Go and CockroachDB can lead to direct API key exposure.

Echo Go applications frequently expose sensitive information in several ways when interacting with CockroachDB. For example, database connection strings containing API keys for cloud CockroachDB clusters might be passed through environment variables to the initialization code. If an attacker triggers an unhandled panic or misconfigured route, Echo can return detailed stack traces that include the full connection string, revealing embedded API keys. Additionally, developers sometimes log incoming requests alongside database query parameters; if these logs include authentication tokens or API keys used for CockroachDB authentication, the logs become an exposure vector.

Another common pattern is the use of middleware in Echo Go that attaches authentication information to the request context for downstream CockroachDB calls. If this middleware does not properly sanitize error responses or propagate secure context, API keys used for CockroachDB authentication may be reflected back to the client in error payloads. This can happen when developers inadvertently include sensitive configuration values in JSON error responses or when validation failures expose internal paths that contain key material.

The specific risk pattern involves an Echo Go route handler that establishes a CockroachDB connection using an API key retrieved from an environment variable. If the handler does not validate and sanitize inputs before using these credentials, an attacker might manipulate request parameters to trigger code paths that expose the connection details. For instance, improperly handled query parameters could lead to SQL injection attempts that, when logged or returned in error messages, reveal the underlying CockroachDB API key structure.

Consider a scenario where an Echo Go service connects to CockroachDB using a certificate-based authentication flow that requires an API key for additional service integrations. If the service bundles this API key within HTTP response bodies during error conditions, or includes it in logs written to standard output, the key becomes accessible to anyone who can view those logs or trigger the error conditions. This exposure can lead to unauthorized access to CockroachDB clusters or associated cloud services that rely on the same key for authentication.

To identify such issues, scanning an Echo Go service that uses CockroachDB with middleBrick can reveal whether API keys appear in error messages, logs, or response payloads. The tool checks for improper error handling, unsafe logging practices, and potential leakage of sensitive configuration values during database interactions. By analyzing both the runtime behavior and the OpenAPI specification when available, middleBrick can highlight specific endpoints where credential exposure is likely to occur in this technology stack.

Remediation focuses on ensuring that API keys used for CockroachDB authentication never appear in error responses, logs, or client-facing payloads. The following code examples demonstrate secure patterns for an Echo Go application connecting to CockroachDB.

First, use environment variables for sensitive configuration but ensure they are never included in error outputs:

package main

import (
    "context"
    "log"
    "os"

    "github.com/labstack/echo/v4"
    "github.com/jackc/pgx/v5/pgxpool"
)

func main() {
    e := echo.New()

    // Load CockroachDB connection parameters securely
    dbURL := os.Getenv("COCKROACH_DATABASE_URL")
    if dbURL == "" {
        log.Fatal("COCKROACH_DATABASE_URL environment variable not set")
    }

    // Create connection pool without exposing credentials in logs
    config, err := pgxpool.ParseConfig(dbURL)
    if err != nil {
        log.Printf("failed to parse database config: %v", err)
        return
    }

    pool, err := pgxpool.NewWithConfig(context.Background(), config)
    if err != nil {
        log.Printf("failed to connect to CockroachDB: %v", err)
        return
    }
    defer pool.Close()

    e.GET("/data", func(c echo.Context) error {
        var result string
        err := pool.QueryRow(c.Request().Context(), "SELECT current_database()").Scan(&result)
        if err != nil {
            // Return generic error without database details
            return c.JSON(500, map[string]string{"error": "internal server error"})
        }
        return c.JSON(200, map[string]string{"database": result})
    })

    e.Start(":8080")
}

This pattern ensures that database connection details, including any API keys used for CockroachDB authentication, remain within server-side environment variables and are never serialized into error responses.

Second, implement structured logging that redacts sensitive information:

package main

import (
    "os"

    "github.com/labstack/echo/v4"
    "github.com/sirupsen/logrus"
)

func secureLogger(next echo.HandlerFunc) echo.HandlerFunc {
    return func(c echo.Context) error {
        // Process request without logging sensitive parameters
        err := next(c)
        if err != nil {
            // Log error without request parameters that might contain keys
            logrus.WithFields(logrus.Fields{
                "path":   c.Request().URL.Path,
                "status": c.Response().Status,
            }).Error("request failed")
        }
        return err
    }
}

func main() {
    e := echo.New()
    e.Use(secureLogger)

    e.GET("/health", func(c echo.Context) error {
        return c.String(200, "OK")
    })

    e.Start(":8080")
}

Finally, when using CockroachDB-specific features like secure connection strings with API keys, ensure that these values are referenced only in server-side configuration and are never included in HTTP responses:

package main

import (
    "context"
    "log"
    "os"

    "github.com/labstack/echo/v4"
    "github.com/jackc/pgx/v5"
)

func getDBConnection(c echo.Context) (*pgx.Conn, error) {
    // Retrieve connection string from secure source
    connStr := os.Getenv("COCKROACH_CONN_STRING")
    if connStr == "" {
        return nil, logError("database configuration missing")
    }

    conn, err := pgx.Connect(c.Request().Context(), connStr)
    if err != nil {
        // Do not include connStr in error
        return nil, logError("database connection failed")
    }
    return conn, nil
}

func logError(message string) error {
    log.Printf("%s: %s", message, "see server logs")
    return echo.ErrInternalServerError
}

These remediation steps ensure that API keys used for CockroachDB authentication remain protected and are not inadvertently exposed through the Echo Go application’s error handling, logging, or response mechanisms.