FlowFence: IoT security Mikal Fourrier Internet of Things - PowerPoint PPT Presentation

Sep 22, 2023 •823 likes •1.02k views

FlowFence: IoT security Mikal Fourrier Internet of Things Interconnection of numerous devices which interacts and exchange data Examples: smart home, smart grid Vague term, like the Cloud 2 Study: Samsung SmartThings

FlowFence: IoT security Mikaël Fourrier
Internet of Things ● Interconnection of numerous devices which interacts and exchange data ● Examples: smart home, smart grid ● Vague term, like the Cloud 2
Study: Samsung SmartThings ● Subscribe: abstraction of the hardware ● Polling ● Access control with a device-level granularity 3
Study: Google Fit ● Wearables-oriented ● Only callbacks ● Access control with scopes – Ex: FITNESS_BODY_READ 4
Study: Android Sensor API ● Events: Motion, Environment, Position ● Callback-based except for Position ● No access control except for Position and heart rate 5
Study: IoT architecture ● Hub ● Cloud 6
Problems with IoT ● Lots of devices → hard to secure ● Very sensitive data: health, home locking, cameras ● Third-party applications have few restrictions: a face-recognition door unlocker can send images to the network 7
FlowFence: basic ideas ● Normal execution environment vs sandbox (Quarantined Modules) ● Use of opaque handles ● Enforce declared data use patterns ● Sandbox treated as a black box 8
API example 9
Publisher examples 10
Taint arithmetic 11
Architecture 12
Sandboxes ● Android process with the “isolatedProcess” flag – Disable all rights except IPC for FlowFence ● Cleaned after QM execution 13
Key-value store ● key → (sensible value, taint) ● Polling easy to implement ● Event channels for callbacks ● Device agnostic 14
Overhead ● 3M/sandbox – reasonable ● 100ms if spare sandboxes – same as network call ● 30M/s bandwidth – the Nest camera uses 1M/s, so should be sufficient 15
Ported applications 16
Weaknesses ● QM could forge keys to leak data – Keys must already exist in the QM ● QM can control it's execution time – Asynchronous execution in future version ● Can't prevent user to approve all ● Over-tainting – Taint bound 17

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