debian-mirror-gitlab/doc/user/application_security/secret_detection/post_processing.md

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Secret Detection post-processing and revocation (FREE SAAS)

Introduced in GitLab 13.6.

GitLab supports running post-processing hooks after detecting a secret. These hooks can perform actions, like notifying the cloud service that issued the secret. The cloud provider can then confirm the credentials and take remediation actions, like:

• Revoking a secret.
• Reissuing a secret.
• Notifying the creator of the secret.

GitLab SaaS supports post-processing for Amazon Web Services (AWS). Post-processing workflows vary by supported cloud providers.

Post-processing is limited to a project's default branch. The epic Post-processing of leaked secrets. contains:

• Technical details of post-processing secrets.
• Discussions of efforts to support additional branches.

NOTE: Post-processing is currently limited to a project's default branch

High-level architecture

This diagram describes how a post-processing hook revokes a secret within the GitLab application:

sequenceDiagram
    autonumber
    GitLab Rails->>+Sidekiq: gl-secret-detection-report.json
    Sidekiq-->+Sidekiq: StoreSecurityReportsWorker
    Sidekiq-->+RevocationAPI: GET revocable keys types
    RevocationAPI-->>-Sidekiq: OK
    Sidekiq->>+RevocationAPI: POST revoke revocable keys
    RevocationAPI-->>-Sidekiq: ACCEPTED
    RevocationAPI-->>+Cloud Vendor: revoke revocable keys
    Cloud Vendor-->>+RevocationAPI: ACCEPTED

Integrate your cloud provider service with GitLab SaaS

Third party cloud and SaaS providers can express integration interest by filling out this form.

Implement a vendor revocation receiver service

A vendor revocation receiver service integrates with a GitLab instance to receive a web notification and respond to leaked token requests.

To implement a receiver service to revoke leaked tokens:

1. Create a publicly accessible HTTP service matching the corresponding API contract below. Your service should be idempotent and rate-limited.

2. When a pipeline corresponding to its revocable token type (in the example, my_api_token) completes, GitLab sends a request to your receiver service.

3. The included URL should be publicly accessible, and contain the commit where the leaked token can be found. For example:

   POST / HTTP/2
   Accept: */*
   Content-Type: application/json
   X-Gitlab-Token: MYSECRETTOKEN
   
   [
     {"type": "my_api_token", "token":"XXXXXXXXXXXXXXXX","url": "https://example.com/some-repo/blob/abcdefghijklmnop/compromisedfile1.java"}
   ]
   

Implement a revocation service for self-managed

Self-managed instances interested in using the revocation capabilities must:

• Deploy the RevocationAPI.
• Configure the GitLab instance to use the RevocationAPI.

A RevocationAPI must:

• Match a minimal API specification.
• Provide two endpoints:
  • Fetching revocable token types.
  • Revoking leaked tokens.
• Be rate-limited and idempotent.

Requests to the documented endpoints are authenticated via API tokens passed in the Authorization header. Request and response bodies, if present, are expected to have the content type application/json.

All endpoints may return these responses:

• 401 Unauthorized
• 405 Method Not Allowed
• 500 Internal Server Error

GET /v1/revocable_token_types

Returns the valid type values for use in the revoke_tokens endpoint.

NOTE: These values match the concatenation of the secrets analyzer's primary identifier by means of concatenating the primary_identifier.type and primary_identifier.value. In the case below, a finding identifier matches:

{"type": "gitleaks_rule_id", "name": "Gitleaks rule ID GitLab Personal Access Token", "value": "GitLab Personal Access Token"}

Status Code	Description
200	The response body contains the valid token type values.

Example response body:

{
    "types": ["gitleaks_rule_id_gitlab_personal_access_token"]
}

POST /v1/revoke_tokens

Accepts a list of tokens to be revoked by the appropriate provider.

Status Code	Description
204	All submitted tokens have been accepted for eventual revocation.
400	The request body is invalid or one of the submitted token types is not supported. The request should not be retried.
429	The provider has received too many requests. The request should be retried later.

Example request body:

[{
    "type": "gitleaks_rule_id_gitlab_personal_access_token",
    "token": "glpat--8GMtG8Mf4EnMJzmAWDU",
    "location": "https://example.com/some-repo/blob/abcdefghijklmnop/compromisedfile1.java"
},
{
    "type": "gitleaks_rule_id_gitlab_personal_access_token",
    "token": "glpat--tG84EGK33nMLLDE70zU",
    "location": "https://example.com/some-repo/blob/abcdefghijklmnop/compromisedfile2.java"
}]

Configure GitLab to interface with RevocationAPI

You must configure the following database settings in the GitLab instance:

• secret_detection_token_revocation_enabled
• secret_detection_token_revocation_url
• secret_detection_token_revocation_token
• secret_detection_revocation_token_types_url

For example, to configure these values in the Rails console:

::Gitlab::CurrentSettings.update!(secret_detection_token_revocation_token: 'MYSECRETTOKEN')
::Gitlab::CurrentSettings.update!(secret_detection_token_revocation_url: 'https://example.gitlab.com/revocation_service/v1/revoke_tokens')
::Gitlab::CurrentSettings.update!(secret_detection_revocation_token_types_url: 'https://example.gitlab.com/revocation_service/v1/revocable_token_types')
::Gitlab::CurrentSettings.update!(secret_detection_token_revocation_enabled: true)

After you configure these values, completing a pipeline performs these actions:

1. The revocation service is triggered once.
2. A request is made to secret_detection_revocation_token_types_url to fetch a list of revocable tokens.
3. Any Secret Detection findings matching the results of the token_types request are included in the subsequent revocation request.