Dr cleaner for mac 10.9 manual#
Dr cleaner for mac 10.9 code#

The keychain system and parental controls are examples of such usage. Stability is determined through the designated requirement (DR) mechanism, and does not depend on the nature of the certificate authority used. (Gatekeeper is a notable exception.) They care only whether the program is validly signed and stable. Many parts of macOS do not care about the identity of the signer. However, this does not happen by default. This means that trusted anchor requirements can be attached to keychain items, either with explicit API calls, or by creating an item with an application whose designated requirement has been explicitly set to require a trusted anchor.

Dr cleaner for mac 10.9 code#

Note: The keychain access controls can allow you to associate arbitrary code signing requirements with keychain items. The keychain acts on the tracking policy by default but it can also allow arbitrary requirement-bearing ACLs to be added to express arbitrary policies determined by the owner of a specific keychain item. Parental controls show that you don't have to even use code signing at all in order to craft a usable policy.Īpplication Firewall uses code signing for both its initial and tracking policy decisions. It simply applies a set requirement to every requester without needing to retain any information. For instance:ĭTA doesn't even have a tracking policy. In addition, it highlights the diversity in how code signing can be used by a specific subsystem to carry out policy. The above examples also further emphasize the fact that all policy decisions are determined by a specific subsystem and not by code signing itself. Restrict what programs are allowed to call DTA APIs (task_for_pid, etc.) The creating application is automatically trusted with its item, and determines the access policy using code signing requirements.įree access to the keychain item by the creating application and tracked with its DR (No automatic tracking for custom ACLs). Restrict what applications a managed user can run.Įxplicit administrator decision (no code signing involved in the initial decision).Ĭontrols what applications can do with specific keychain items. Restrict inbound network access by applications.Īllow if a trusted anchor check succeeds otherwise prompt the user.

None (each request is evaluated by policy). Restrict launching of applications from unidentified developersĪ configurable trusted anchor check (Developer ID or Mac App Store). Initial policy decision is verified against the application's DR. Gate access to system resources based on entitlements.Īllow if entitlement is present in the app's code signature. Table 1 Examples of macOS subsystems that verify the validity of code. For a concrete example, below is a list of commonly-used subsystems that verify code signatures: Subsystem tracking alludes to how the subsystem verifies an identity after the initial policy decision has been acted upon. Additionally, some subsystems track identities and some don't.

In general, most subsystems do not care that your identity certificate chain leads to a trusted anchor, however, some do. You have to ask based on the subsystem, and it is more meaningful to ask whether a specific subsystem trusts your signature. Thus, it makes no sense to ask whether code signing trusts a particular signature. Each macOS subsystem has its own policy, and makes this determination separately. A security trust policy determines whether a particular code identity, which is essentially the designated requirement (DR) for the code, should be accepted for allowing something to happen on the system, e.g., access to a resource or service, after testing for validity. However, policy is mostly set by the specific subsystem carrying out validation any policy decisions outside of those implemented by macOS subsystems are left up to you and your end users in how you interoperate between a specific set of subsystems.

Code signing does implement some policy checks. In short, code signing is a technology that allows you to dictate how validating mechanisms will interpret your code. While tools like Xcode handle much of the certificate management, you can also maintain your signing certificates yourself if your situation calls for it. Most code signing certificates are provided by Apple or internally provisioned by enterprise IT departments.

Dr cleaner for mac 10.9 manual#

Apple provides the tools necessary to sign your programs (see the codesign manual page).Ĭode signing on macOS is an integral part of the development process. Document Revision History Code Signing RecapĬode signing is a facility by which developers can assign a digital identity to their programs.