Update on MIT-LL Integration

1. Update on MIT-LL Integration Bill Harris and Rich Joiner

2. Schedule: JAM • Deliverables: • Policy for Secure Note application • JAM weaver • Chrome browser modified for enforcement • Weaver/policy delivery planned for 9/3. • Enforcement delivery planned for 9/10.

3. Application: Secure Note • Written by MIT-LL crew • Code comprises • SNote application logic • Midori UI library • Google AES encryption library • http://snote/SNoteSwindler.html

4. Policy • Read-only, write-once for display elements • Write-only, read-once for input elements

5. Policy state machine a: set(%x.textContent) && %x.className === “non-editable” b: set(%x.innerHTML) && %x.className === “non-editable” c: get(%x.textContent) && %x.className === “destructive-read” d: get(%x.innerHTML) && %x.className === “destructive-read” e: set(%x.textContent) && %x.className === “read-only” f: set(%x.textContent) && %x.className === “read-only” g: get(%x.textContent) && %x.className === “write-only” h: get(%x.textContent) && %x.className === “write-only” 1 a|b a|b 0 -1 e|f|g|h c|d c|d 2

6. Policy specification 0,2: set(%x.textContent) && %x.className === "non-editable" 2,-1: set(%x.innerHTML) && %x.className === "non-editable" 0,2: set(%x.innerHTML) && %x.className === "non-editable" 2,-1: set(%x.textContent) && %x.className === "non-editable" 0,-1: set(%x.innerHTML) && %x.className === "read-only“ 0,-1: set(%x.textContent) && %x.className === "read-only" 0,1: get(%x.textContent) && %x.className === "destructive-read" 1,-1: get(%x.textContent) && %x.className === "destructive-read" 0,1: get(%x.innerHTML) && %x.className === "destructive-read" 1,-1: get(%x.innerHTML) && %x.className === "destructive-read" 0,-1: get(%x.textContent) && %x.className === "write-only" 0,-1: get(%x.innerHTML) && %x.className === "write-only"

7. JAM Weaver • To be delivered as a virtual machine image • Compiled JAM binaries • Test cases • Script to download and install dependencies • Documentation • Policy specification language • General usage • Current limitations

9. Enforcement • Checks are evaluated at runtime in an isolated forked process • JavaScript native functions added to trigger the fork and evaluate policy predicates • To be delivered as a stand-alone Chrome binary built on FreeBSD 9.

11. CapWeave in the CRASH System • Overview of CapWeave usage • Sketch of our approach • Discuss deliverables, requirements

15. CapWeave Usage • CRASH server generates web contentby running php scripts • CRASH team defines policy for all php scripts • CRASH team applies CapWeave to rewrite phpinterpreter to enforce policy

16. php workflow filesystem php web_script.cgi web content

17. php Requirements • Whitelist of system libs: read-only • php, MediaWikiconfig. files: read-only • MediaWikiphp scripts: read-only • MediaWiki skin files: read-only • Scratch directories (e.g., /tmp): read-write • Sockets to database server: read-write

18. CapWeave in the CRASH System • Overview of CapWeave usage • Sketch of our approach • Discuss deliverables, requirements

19. UW Challenges • Express requirements in policy language • Rewrite/weave the php to satisfy the policy

20. A Shim for open() intshim_open(char* path, int mode) { intfd = open(path, mode); if (sat_req_1(path)) { cw_act(0); } if (sat_req_2(path)) { … } return fd; }

21. Requirement 1 Policy (* requirement 1 policy: *) let not_fd_read = … in any_act* . (cw_act 0) . (any_prog_actwith not_fd_read)

22. A Weaved shim_open() intshim_open(char* path, int mode) { intfd = open(path, mode); if (sat_req_1(path)) { cw_act(0); lc_limitfd(fd, CAP_READ); } if (sat_req_2(path)) { … } return fd; }

23. CapWeave in the CRASH System • Overview of CapWeave usage • Sketch of our approach • Discuss deliverables, requirements

24. Requirements • Decision functions for each requirement • E.g.: • intis_whitelist_sys_lib(char* path) • intis_mediawiki_config(char* path)

25. Deliverables • Policy regex text file • Capsicum 9 VMWare image with weaved php • Capsicum team recently posted a workingCapsicum VMWare image

26. Extra Slides