Reentrancy Guards

[Kaylahray]

User Story

• As a Dev, I want to prevent reentrancy attacks during transfers.

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Description

• Implement a lock pattern for functions that send tokens to prevent reentrancy attacks.

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Files to Create / Edit

• contracts/geev-core/src/
  • utils.rs

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Functional Requirements

• Lock

  • Set a temporary flag before execution

• Unlock

  • Remove flag after execution

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Suggested Implementation

• Function: with_reentrancy_guard(env, lambda)

  1. Check if 'Lock' key exists in Temporary Storage. If so, panic!
  2. Set 'Lock' key to true
  3. Execute the lambda function (the main logic)
  4. Remove 'Lock' key

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Acceptance Criteria

• Applied to distribute_prize and withdraw_aid

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Submission Guidelines

• Branch: security/reentrancy