profile-acls

profile-acls is a Samba configuration parameter used primarily in the [profiles] share to control how NT-style Access Control Lists (ACLs) are applied to roaming profiles. When enabled, it ensures that the ACLs associated with user profiles are preserved and enforced in a way that mirrors Windows behavior, providing a consistent security experience in Active Directory environments.

Purpose

  • Roaming Profile Management: Ensures that user profile data stored on a Samba server retains its Windows ACL settings, so that access permissions are consistent with what is expected in a Windows environment.

  • Consistent Permission Enforcement: Helps maintain the integrity of security descriptors for profiles by applying inherited and explicit ACLs from the parent directory to newly created profile files and directories.

How It Works

  • ACL Preservation: When a user accesses their roaming profile, the profile-acls setting causes Samba to apply the ACLs stored with the profile. This means that if a parent directory has specific ACLs, new files and subdirectories within a user’s profile will inherit those ACLs automatically.

  • Integration with VFS ACL Modules: This parameter typically works in conjunction with other Samba VFS modules that manage ACLs (e.g., vfs_acl_xattr or vfs_acl_tdb). These modules handle the storage and retrieval of ACL information—either in extended attributes or in a TDB file—so that Windows ACLs are properly maintained on Unix filesystems.

Configuration

To enable profile-acls, add it to your [profiles] share definition in the smb.conf file. For example:

[profiles]
   path = /srv/samba/profiles
   read only = no
   browseable = no
   # Enable the use of Windows-style ACLs for roaming profiles
   profile acls = yes

  • profile acls = yes: Activates the feature so that the ACLs for user profiles are preserved and enforced.

  • profile acls = no: Disables the feature, meaning that Samba may apply default or inherited permissions instead.

Use Cases

  • Active Directory Roaming Profiles: In AD environments, users' roaming profiles stored on a Samba server will retain their ACLs as set in Windows, ensuring a consistent security experience across platforms.

  • Security Consistency: For organizations that require strict control over user profile data, enabling profile-acls ensures that access permissions are uniformly enforced, minimizing the risk of unauthorized access.

  • Administrative Efficiency: Automatically applying ACLs based on parent directories reduces the need for manual intervention, simplifying the management of large numbers of roaming profiles.

Considerations

  • Filesystem Support: Ensure that the underlying filesystem supports extended attributes if you are using modules like vfs_acl_xattr, as this is necessary for storing detailed ACL information.

  • Interaction with Other Modules: When using profile-acls, verify that it integrates correctly with other ACL-related VFS modules to prevent conflicts or unexpected permission results.

  • Performance Impact: Managing ACLs may add a slight performance overhead; it is recommended to test the configuration in your environment before deploying it widely.

Conclusion

The profile-acls parameter in Samba is an essential setting for environments using roaming profiles, particularly in Windows Active Directory contexts. By enabling this feature, administrators ensure that NT-style ACLs are properly inherited and enforced for user profile data, leading to a consistent and secure user experience across mixed-OS networks.

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