đź“… Webinar - Delivering Security on Your Terms: An Intro to Self-Hosted

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đź“… Webinar - Delivering Security on Your Terms: An Intro to Self-Hosted

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My Postmark Token leaked! What should I do?

What is a Postmark Token and how it is used?

A Postmark Token is a unique identifier provided by the Postmark email service that is used to authenticate and authorize API requests for sending emails.

When it comes to using the Postmark Token in development, there are three main use cases:

  • Authentication: The Postmark Token is used for authenticating and authorizing requests to the Postmark API, ensuring that only authorized users can access and interact with the email delivery service.
  • Email Sending: Developers use the Postmark Token to send transactional emails through the Postmark API, allowing for reliable and secure delivery of important messages to users.
  • Tracking and Analytics: The Postmark Token enables developers to track email delivery metrics and analyze the performance of email campaigns, helping them optimize their communication strategies for better engagement and results.

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1. Code snippets to prevent Postmark Token hardcoding using environment variables

Using environment variables for storing sensitive information like Postmark Tokens is a secure practice because:

  • Environment variables are not hardcoded in the codebase, reducing the risk of exposure in case of a breach.
  • Environment variables are stored outside of the code repository, providing an additional layer of security.
  • Environment variables can be easily managed and rotated without needing to modify the code.

How to secure your secrets using environment variables

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2. Code snippet to prevent Postmark Token hardcoding using AWS Secrets Manager

Using AWS Secrets Manager to manage Postmark Tokens is a secure way to handle sensitive data. Here are code snippets in five different programming languages that demonstrate how to retrieve the Postmark Token from AWS Secrets Manager.

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3. Code snippet to prevent Postmark Token hardcoding using HashiCorp Vault

Using HashiCorp Vault for managing Postmark Tokens is a great way to enhance security. Here are code snippets in five different programming languages for securely handling a Postmark Token using HashiCorp Vault.

Remember to replace the VAULT_ADDR and VAULT_TOKEN with your Vault server address and authentication token. The snippets assume that the Postmark Token is stored under the api_key field within Vault. The specifics of the Vault path and field names should be adjusted to match your Vault setup.

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4. Code snippet to prevent Postmark Token hardcoding using CyberArk Conjur

Using CyberArk Conjur to manage Postmark Token is a secure way to handle sensitive data. Here are code snippets in five different programming languages that demonstrate how to retrieve the Postmark Token from CyberArk Conjur.

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How to generate a Postmark Token?

To generate a Postmark Token, follow these steps:

  1. Log in to your Postmark account.
  2. Go to the "Account" section.
  3. Click on "Tokens" in the left menu.
  4. Click on the "Generate Token" button.
  5. Enter a name for your token and select the permissions you want to grant.
  6. Click on the "Create Token" button.

Your Postmark Token will be generated and displayed. Make sure to copy and securely store this token as it will be needed for authenticating API requests to Postmark.

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My Postmark Token leaked, what are the possible reasons?

There are several reasons why a Postmark Token might have been leaked:

  • Improper storage: If the token was stored in a public repository or in a file that was accessible to unauthorized users, it could have been leaked.
  • Weak access controls: If the token was shared with individuals who did not have a legitimate need to access it, or if the access controls were not properly configured, it could have been leaked.
  • Phishing attacks: If a developer fell victim to a phishing attack and unknowingly shared the token with a malicious actor, it could have been leaked.
  • Accidental exposure: Developers may inadvertently include the token in logs, error messages, or other public-facing content, leading to its leakage.

What are the risks of leaking a Postmark Token

When it comes to the Postmark Token, it is crucial for developers to understand the risks associated with leaking this sensitive information. Here are some key points to consider:

  • Postmark Tokens are used for authenticating and authorizing access to the Postmark email delivery service.
  • Leaking a Postmark Token can lead to unauthorized access to your Postmark account, allowing attackers to send emails on your behalf.
  • Attackers could abuse your Postmark account to send spam emails, phishing emails, or other malicious content, damaging your reputation and potentially leading to legal consequences.
  • Exposing your Postmark Token in publicly accessible code repositories or configuration files can result in a data breach and compromise the security of your email communications.

By understanding these risks and following best practices for secret management, developers can help protect their Postmark Tokens and prevent unauthorized access to their Postmark accounts.

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Postmark Token security best practices

  • Avoid embedding the secret directly in your code. Instead, use environment variables or secrets managers‍
  • Secure storage: store the Postmark Token in a secure location, such as a password manager or a secrets management service.
  • Regular rotation: periodically rotate the API key to minimize the risk of long-term exposure.
  • Restrict permissions: apply the principle of least privilege by only granting the key the minimum necessary permissions.
  • Monitor usage: regularly check the usage logs for any unusual activity or unauthorized access attempts.
  • Implement access controls: limit the number of users who have access to the secret and enforce strong authentication measures.
  • Use a secrets manager: utilize secret management tools like CyberArk or AWS Secrets Manager for enhanced security.

By adhering to the best practices, you can significantly reduce the risk associated with Postmark Token usage and improve the overall security of your Postmark Token implementations.

Exposing secrets on GitHub: What to do after leaking Credential and API keys

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Postmark Token leak remediation: what to do

What to do if you expose a secret: How to stay calm and respond to an incident [cheat sheet included]

How to check if Postmark Token was used by malicious actors

  • Review Access Logs: Check the access logs of your Postmark Token account for any unauthorized access or unusual activity. Pay particular attention to access from unfamiliar IP addresses (if you haven’t set up a specific allow list) or at odd hours.
  • Monitor Usage Patterns: Look for anomalies in the usage patterns, such as unexpected spikes in data access or transfer.
  • Check Active Connections and Operations: Review the list of active connections and recent operations on your database. Unusual or unauthorized operations might indicate malicious use.
  • Audit API Usage: If possible, audit the usage of your API key through any logging or monitoring services you have integrated with Postmark Token. This can give insights into any unauthorized use of your key.

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Steps to revoke the Postmark Token

Generate a new Postmark Token:

  • Log into your Postmark Token account.
  • Navigate to the API section and generate a new API key.

Update Services with the new key:

  • Replace the compromised key with the new key in all your services that use this API key.
  • Ensure all your applications and services are updated with the new key before deactivating the old one.

Deactivate the old Postmark Token:

  • Once the new key is in place and everything is functioning correctly, deactivate the old API key.
  • This can typically be done from the same section where you generated the new key.

Monitor after key rotation:

  • After deactivating the old key, monitor your systems closely to ensure that all services are running smoothly and that there are no unauthorized access attempts.

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How to understand which services will stop working

  • Inventory of services: keep an inventory of all services and applications that utilize your Postmark Token.
  • Communication and documentation: Ensure that your team is aware of which services are dependent on the key. Maintain documentation for quick reference.
  • Testing: before deactivating the old key, test your services with the new key in a staging environment. This helps in identifying any services that might face issues post rotation.
  • Fallback strategies: Have a fallback or emergency plan in case a critical service fails after the key rotation. This might include temporary measures or quick rollback procedures.

In summary, the remediation process involves identifying potential misuse, carefully rotating the key, and ensuring minimal disruption to services. Being proactive and having a well-documented process can greatly reduce the risks associated with a compromised API key.

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What about other secrets?

GitGuardian helps developers keep 350+ types of secrets out of source code. GitGuardian’s automated secrets detection and remediation solution secure every step of the development lifecycle, from code to cloud:

  • On developer workstations with git hooks (pre-commit and pre-push);
  • On code sharing platforms like GitHub, GitLab, and Bitbucket;
  • In CI environments (Circle CI, Travis CI, Jenkins CI, GitHub Actions, and many more);
  • In Docker images.

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Environment Variables
Environment Variables
Environment Variables

charge

nullable string

For card errors, the ID of the failed charge.

payment_method_type

nullable string

If the error is specific to the type of payment method, the payment method type that had a problem. This field is only populated for invoice-related errors.

doc_url

nullable string

A URL to more information about the error code reported.

request_log_url

nullable string

A URL to the request log entry in your dashboard.

charge

nullable string

If the error is specific to the type of payment method, the payment method type that had a problem. This field is only populated for invoice-related errors.

Hide
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child attributes

type

enum

For some errors that could be handled programmatically, a short string indicating the error code reported.

charge

nullable string

If the error is specific to the type of payment method, the payment method type that had a problem. This field is only populated for invoice-related errors.

Hide
Show
child attributes

type

enum

For some errors that could be handled programmatically, a short string indicating the error code reported.

payment_intent

nullable object

The PaymentIntent object for errors returned on a request involving a PaymentIntent.

setup_intent

nullable object

The SetupIntent object for errors returned on a request involving a SetupIntent.

Hide
Show
child attributes

type

enum

For some errors that could be handled programmatically, a short string indicating the error code reported.

Hide
Show
child attributes

type

enum

For some errors that could be handled programmatically, a short string indicating the error code reported.

CLIENT LIBRARIES

$ gem install stripe
$ pip install stripe
$ composer require stripe/stripe-php
MAVEN
<dependency>
  <groupId>com.stripe</groupId>
  <artifactId>stripe-java</artifactId>
  <version>24.16.0</version>
</dependency>

GRADLE
compile "com.stripe:stripe-java:24.16.0"
$ npm install --save stripe
$ go get github.com/stripe/stripe-go/v76
$ nuget install Stripe.net
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