Peer-to-Peer Secure Update for Heterogeneous Edge Devices
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1 Peer-to-Peer Secure Update for Heterogeneous Edge Devices E. Band, H. Herry, C. Perkins, J. Singer School of Computing Science University of Glasgow 1
2 FRµIT: Federated RaspberryPi µ-infrastructure Testbed ( Massive aggregation of low-cost, low-power, commodity infrastructure can form an efficient and effective compute fabric for key distributed applications Applications: edge-compute, IoT, portable data-center, expendablecompute Traditional: few big data-centers vs FRµIT: many micro data-centers Funded by UK-EPSRC 2
3 Problem: Updating Remote System Update system is critical Security patch Deploy firmware, software, configurations Regular update Limited (or no) physical access Remote locations Mobile Private residential locations Existing tools Requires direct SSH access Needs well-connected server 3
4 Problem: Updating Remote System Heterogeneous Network Some nodes are behind NATs (e.g. residential) or Firewalls (e.g. university) Single-point of failure Scalability Denial of Service attack on update server Linux distributions: dedicated mirror servers Randomized download slot-times [Pollock et.al.] 4
5 Our Approach Decentralized management framework using Peer-to-Peer overlay network A gossip protocol to distribute secured update notifications (torrent-file) STUN-based UDP hole punching to discover and open NAT bindings (NAT-TM) BitTorrent to securely distribute updates (software, management scripts, etc) Contribution: our system assumes partial network connectivity, and works in the presence of NATs or firewalls 5
6 Our Approach Other advantages Bandwidth sharing Updates can reach indirectly connected nodes Resilient to single point of failure and attacks We may not need a dedicated update server 6
7 Architecture P2P Update System Agent STUN Server NAT-TM BTClient (Transmission) Puppet Deployer Chef Shell NAT OS 7
8 Target resource identifier Distinguish different target resources Version (monotonically increasing) Help agent to ignore outdated update existing in the network Digital Signature Admin holds a private-key Each node has a public-key Signature = encrypt(sha512(torrent-file), private-key) sha512(torrent-file) =? decrypt(signature, public-key) Torrent-file (Standard) Tracker/s File-name File-length Piece-length Cryptographic-hashes of file pieces Target resource identifier Version Digital signature 8
9 2 Updated- 9
10 2 Updated- 10
11 IP2:Port2 2 Updated- 11
12 IP2:Port2 2 Updated- 12
13 IP2:Port2 2 Updated- 13
14 IP2:Port2 2 Updated- 14
15 STUN Server Updated- NAT NAT 4 5 IP4:Port4 3 15
16 Updated- NAT (EIP4:EPort4) STUN Server NAT (EIP3:EPort3) 4 5 IP4:Port4 3 16
17 Updated- NAT (EIP4:EPort4) STUN Server NAT (EIP3:EPort3) 4 5 IP4:Port4 3 17
18 Updated- NAT (EIP4:EPort4) STUN Server NAT (EIP3:EPort3) IP5:Port5 4 5 IP4:Port4 3 18
19 Updated- NAT (EIP4:EPort4) STUN Server NAT (EIP3:EPort3) IP5:Port5 4 5 IP4:Port4 3 19
20 Updated- NAT (EIP4:EPort4) STUN Server NAT (EIP3:EPort3) IP5:Port5 4 5 IP4:Port4 3 20
21 Updated- NAT (EIP4:EPort4) STUN Server NAT (EIP3:EPort3) IP5:Port5 4 5 IP4:Port4 3 21
22 Updated- NAT (EIP4:EPort4) STUN Server NAT (EIP3:EPort3) IP5:Port5 4 5 IP4:Port4 3 22
23 STUN Server Updated- Firewall 6 23
24 STUN Server Updated- Firewall (EIP6:EPort6) (Admin modifies the rules) 6 24
25 STUN Server EIP6:EPort6,IP6:Port6 Updated- Firewall (EIP6:EPort6) (Admin modifies the rules) 6 25
26 EIP6:EPort6,IP6:Port6 STUN Server EIP6:EPort6,IP6:Port6 Updated- Firewall (EIP6:EPort6) (Admin modifies the rules) 6 26
27 EIP6:EPort6,IP6:Port6 STUN Server EIP6:EPort6,IP6:Port6 Updated- Firewall (EIP6:EPort6) (Admin modifies the rules) 6 27
28 EIP6:EPort6,IP6:Port6 STUN Server EIP6:EPort6,IP6:Port6 Updated- Firewall (EIP6:EPort6) (Admin modifies the rules) 6 28
29 EIP6:EPort6,IP6:Port6 STUN Server EIP6:EPort6,IP6:Port6 Updated- Firewall (EIP6:EPort6) (Admin modifies the rules) 6 29
30 EIP6:EPort6,IP6:Port6 STUN Server EIP6:EPort6,IP6:Port6 Updated- Firewall (EIP6:EPort6) (Admin modifies the rules) 6 30
31 Preliminary Experiment 6 Raspberry-Pis 2/3 Residential networks (Home NAT) Sky, BT Firewall Network School of Computing Science (University of Glasgow) STUN Server on Google Compute Engine VM Update: web server with static files Puppet manifest, puppet-modules, software packages, html files Result: successful updates on all-nodes, including behind home NATs and firewall 31
32 Shortcomings Not work with all NAT types e.g. Symmetric NAT 32
33 Conclusion & Future Work Our (prototype) framework can update securely the system with partial network connectivity, and works in the presence of NATs or firewalls Integrate this P2P secure update framework into FRµIT Testbed Large-scale experiments on FRµIT Testbed 33
34 Do you have an unused Raspberry Pi board locked away in a cupboard? Please donate it for scientific research. 34
35 Thank you! 35
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