Recursive Sandboxes: Extending Systrace To Empower Applications
The systrace system-call interposition mechanism has become a popular method for containing untrusted code through program-specific policies enforced by user-level daemons. We describe our extensions to systrace that allow sandboxed processes to further limit their children processes by issuing dynamically constructed policies. We discuss our extensions to the systrace daemon and the OpenBSD kernel, as well as a simple API for constructing simple policies. We present two separate implementations of our scheme, and compare their performance with the base systrace system. We show how our extensions can be used by processes such as ftpd, sendmail, and sshd.
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Also Published In
- Security and protection in information processing systems: IFIP 18th world computer congress: TC11 19th international information security conference, 22-27 August 2004, Toulouse, France.
More About This Work
- Academic Units
- Computer Science
- Kluwer Academic Publishers
- IFIP International Federation for Information Processing, 147
- Published Here
- July 5, 2012