Security/Sandbox/Deny Filesystem Access
A place for us to record everything we know about turning off filesystem access from the content process.
Status of filesystem access from the content process in Nightly:
| Platform | Status in Nightly |
|---|---|
| Windows | TBD |
| OS X | Some directories are read/write protected, but this will not provide real security until the bulk of the $HOME directory is fully write protected.
On OS X, the Firefox Profile directory is stored within ~/Library/Application Support/Firefox/Profiles/. ~/Library is read/write protected with a few exceptions for some specific subdirectories. Access to $HOME and other areas of the filesystem is not restricted. i.e., the content process can read and write to/from anywhere the OS permits: $HOME and temporary directories. The ~/Library read/write prevention could be bypassed because the rest of the $HOME is read/write accessible. For example, a compromised process could add malicious commands to ~/.login-type files to copy data from ~/Library when a user logs in. |
| Linux | No filesystem policy enabled |
| Other | No filesystem policy enabled |