How to Suppress the Password Dialog for a Private Key in Apple Keychain

To prevent the password dialog from being shown when you use a private key in the Apple Keychain, you need to adjust the key’s access control settings. Specifically, you can configure the key to allow applications to access it without prompting the user.

Here’s how to achieve this:

Steps to Prevent Password Dialogs

1. Open Keychain Access

1. Launch Keychain Access:
   • Search for it in Spotlight (“Cmd + Space” > type “Keychain Access”) or navigate to Applications > Utilities > Keychain Access.

2. Locate the Private Key

1. Select the appropriate keychain (e.g., Login, System).
2. In the search bar, enter the name or identifier of the private key you are trying to use.
3. Ensure you are looking at Keys (not certificates).

3. Adjust Access Control

1. Right-click on the private key and select Get Info.
2. Go to the Access Control tab.

4. Modify Access Control Settings

1. Allow All Applications:
   • Select “Allow all applications to access this item.”
   • This setting allows any application to use the key without prompting for a password.
2. Specify Allowed Applications (Optional):
   • If you prefer more control, select “Confirm before allowing access”, then add specific applications by clicking the “+” button and choosing the desired applications.
3. Click Save Changes:
   • You may be prompted to authenticate with your macOS password to save these changes.
     

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5. Test the Changes

• The first time you test, a dialog may appear with an option to “Always Allow.” Selecting “Always Allow” will prevent future dialogs.
• Use the application that accesses the private key to confirm the password dialog no longer appears.
• If you encounter issues, revisit the Access Control tab to verify your settings.
  

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Important Notes

1. Security Implications:
   • Allowing all applications to access a private key can expose it to unauthorized usage if malicious software is present on your system. Use this option only if the key is not highly sensitive.
   • Limiting access to specific applications provides a balance between usability and security.
2. System Keychain:
   • If the key resides in the System keychain, you may need administrator privileges to change access control settings.
3. Persistent Prompts:
   • If the password dialog still appears, ensure that:
     • The private key and certificate are properly linked in Keychain Access.
     • The application is using the correct key.
       

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By modifying the access control settings, you can eliminate password prompts and streamline the usage of your private key.