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The Safe-Tcl Security Model

The Safe-Tcl Security Model. Present by Yu-Chang SHEN 4 May 2001. John K. Ousterout Jacob Y. Levy Brent B. Welch. Outline. Introduction on Safe-Tcl Security issues Summary. Safe-Tcl.

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The Safe-Tcl Security Model

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  1. The Safe-Tcl Security Model Present by Yu-Chang SHEN 4 May 2001 John K. Ousterout Jacob Y. Levy Brent B. Welch

  2. Outline • Introduction on Safe-Tcl • Security issues • Summary

  3. Safe-Tcl • Safe-TCL is a mechanism for executing untrusted program written in Tcl scripts safely and for providing mediated access by such scripts to potentially dangerous functionality

  4. Command 1 Command 1 Command 2 Command 2 Command 3 Hide Command 4 Command 4 Command 5 Command 5 Aliases Command 6 Hide Master Interpreter Safe Interpreter Padded Cell Model

  5. Security issues • Integrity attacks • Privacy attacks • Denial of Service attacks

  6. Prevent the attacks • Denied all operations that modify, read and transmit the state of the host environment • Setup security policies • Different level of trustiness = Different level of rights

  7. Summary • Padded Cell model in general is similar to User/Kernel space model • Safe-Tcl using padded cell model to prevent integrity and privacy attacks • Safe-Tcl can use security policies to regulate permissions that an applet have

  8. Questions • What is the hardest part of designing Safe-Tcl environment?

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