为企业中的安全设置实施策略

About policies for security settings in your enterprise

You can enforce policies to control the security settings for organizations owned by your enterprise on GitHub Enterprise Cloud. By default, organization owners can manage security settings.

Requiring two-factor authentication for organizations in your enterprise

Enterprise owners can require that organization members, billing managers, and outside collaborators in all organizations owned by an enterprise use two-factor authentication to secure their user accounts. This policy is not available for enterprises with managed users.

Before you can require 2FA for all organizations owned by your enterprise, you must enable two-factor authentication for your own account. For more information, see "Securing your account with two-factor authentication (2FA)."

Before you require use of two-factor authentication, we recommend notifying organization members, outside collaborators, and billing managers and asking them to set up 2FA for their accounts. Organization owners can see if members and outside collaborators already use 2FA on each organization's People page. For more information, see "Viewing whether users in your organization have 2FA enabled."

1. In the top-right corner of GitHub, click your profile photo.

2. Depending on your environment, click Your enterprise, or click Your enterprises then click the enterprise you want to view.

3. On the left side of the page, in the enterprise account sidebar, click Settings.

4. Under Settings, click Authentication security.

5. Under "Two-factor authentication", review the information about changing the setting. Optionally, to view the current configuration for all organizations in the enterprise account before you change the setting, click View your organizations' current configurations.

   

6. Under "Two-factor authentication", select Require two-factor authentication for all organizations in your business, then click Save.

7. If prompted, read the information about members and outside collaborators who will be removed from the organizations owned by your enterprise. To confirm the change, type your enterprise's name, then click Remove members & require two-factor authentication.

8. Optionally, if any members or outside collaborators are removed from the organizations owned by your enterprise, we recommend sending them an invitation to reinstate their former privileges and access to your organization. Each person must enable two-factor authentication before they can accept your invitation.

Managing SSH certificate authorities for your enterprise

You can use a SSH certificate authority (CA) to allow members of any organization owned by your enterprise to access that organization's repositories using SSH certificates you provide. If your enterprise uses Enterprise Managed Users, enterprise members can also be allowed to use the certificate to access personally-owned repositories. You can require that members use SSH certificates to access organization resources, unless SSH is disabled in your repository. For more information, see "About SSH certificate authorities."

When you issue each client certificate, you must include an extension that specifies which GitHub Enterprise Cloud user the certificate is for. For more information, see "About SSH certificate authorities."

Adding an SSH certificate authority

If you require SSH certificates for your enterprise, enterprise members should use a special URL for Git operations over SSH. For more information, see "About SSH certificate authorities."

Each certificate authority can only be uploaded to one account on GitHub Enterprise Cloud. If an SSH certificate authority has been added to an organization or enterprise account, you cannot add the same certificate authority to another organization or enterprise account on GitHub Enterprise Cloud.

If you add one certificate authority to an enterprise and another certificate authority to an organization in the enterprise, either certificate authority can be used to access the organization's repositories.

1. In the top-right corner of GitHub, click your profile photo.

2. Depending on your environment, click Your enterprise, or click Your enterprises then click the enterprise you want to view.

3. On the left side of the page, in the enterprise account sidebar, click Settings.

4. Under Settings, click Authentication security.

5. To the right of "SSH Certificate Authorities", click New CA.

6. Under "Key," paste your public SSH key.

7. Click Add CA.

8. Optionally, to require members to use SSH certificates, select Require SSH Certificates, then click Save.

   Note: When you require SSH certificates, users will not be able to authenticate to access the organization's repositories over HTTPS or with an unsigned SSH key, regardless of whether the SSH key is authorized for an organization that requires authentication through an external identity system.

   The requirement does not apply to authorized GitHub Apps (including user-to-server tokens), deploy keys, or to GitHub features such as GitHub Actions and Codespaces, which are trusted environments within the GitHub ecosystem.

Managing access to user-owned repositories

You can enable or disable access to user-owned repositories with an SSH certificate if your enterprise uses managed user accounts. However, if your enterprise uses personal accounts on GitHub.com members cannot use the certificate to access personally-owned repositories.

1. In the top-right corner of GitHub, click your profile photo.

2. Depending on your environment, click Your enterprise, or click Your enterprises then click the enterprise you want to view.

3. On the left side of the page, in the enterprise account sidebar, click Settings.

4. Under Settings, click Authentication security.

5. Under "SSH Certificate Authorities", select the Access User Owned Repository checkbox.

Deleting an SSH certificate authority

Deleting a CA cannot be undone. If you want to use the same CA in the future, you'll need to upload the CA again.

1. In the top-right corner of GitHub, click your profile photo.

2. Depending on your environment, click Your enterprise, or click Your enterprises then click the enterprise you want to view.

3. On the left side of the page, in the enterprise account sidebar, click Settings.

4. Under Settings, click Authentication security.

5. Under "SSH Certificate Authorities", to the right of the CA you want to delete, click Delete.

6. Read the warning, then click I understand, please delete this CA.

Upgrading an SSH certificate authority

CAs uploaded to your enterprise prior to March 27th, 2024, allow the use of non-expiring certificates. To learn more about why expirations are now required for new CAs, see "About SSH certificate authorities." You can upgrade an existing CA to prevent it from issuing non-expiring certificates. For best security, we strongly recommend upgrading all your CAs once you validate you're not reliant on non-expiring certificates.

1. In the top-right corner of GitHub, click your profile photo.

2. Depending on your environment, click Your enterprise, or click Your enterprises then click the enterprise you want to view.

3. On the left side of the page, in the enterprise account sidebar, click Settings.

4. Under Settings, click Authentication security.

5. Under "SSH Certificate Authorities", to the right of the CA you want to upgrade, click Upgrade.

6. Read the warning, then click Upgrade.

After upgrading the CA, non-expiring certificates signed by that CA will be rejected.

Managing SSO for unauthenticated users

If your enterprise uses Enterprise Managed Users, you can choose what unauthenticated users see when they attempt to access your enterprise's resources. For more information about Enterprise Managed Users, see "About Enterprise Managed Users."

By default, to hide the existence of private resources, when an unauthenticated user attempts to access your enterprise, GitHub displays a 404 error.

To prevent confusion from your developers, you can change this behavior so that users are automatically redirected to single sign-on (SSO) through your identity provider (IdP). When you enable automatic redirects, anyone who visits the URL for any of your enterprise's resources will be able to see that the resource exists. However, they'll only be able to see the resource if they have appropriate access after authenticating with your IdP.

1. In the top-right corner of GitHub, click your profile photo.

2. Depending on your environment, click Your enterprise, or click Your enterprises then click the enterprise you want to view.

3. On the left side of the page, in the enterprise account sidebar, click Settings.

4. Under Settings, click Authentication security.

5. Under "Single sign-on settings", select or deselect Automatically redirect users to sign in.

Further reading

• "About SAML for enterprise IAM"
• "Accessing compliance reports for your enterprise"
• "Restricting network traffic to your enterprise with an IP allow list"