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// Copyright 2025 Lablup Inc. and Jeongkyu Shin
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//! Tests for jump host timeout calculation
//!
//! These tests verify the security fixes implemented by pr-reviewer:
//! - Integer overflow prevention using saturating arithmetic
//! - Maximum timeout cap of 600 seconds (10 minutes)
//! - Correct timeout scaling based on hop count
/// Calculate timeout for jump host connections
///
/// This replicates the timeout calculation logic from interactive.rs
/// to ensure security properties are maintained.
fn calculate_jump_host_timeout(hop_count: usize) -> u64 {
const BASE_TIMEOUT: u64 = 30;
const PER_HOP_TIMEOUT: u64 = 15;
const MAX_TIMEOUT_SECS: u64 = 600; // 10 minutes max
// SECURITY: Use saturating arithmetic to prevent integer overflow
BASE_TIMEOUT
.saturating_add(PER_HOP_TIMEOUT.saturating_mul(hop_count as u64))
.min(MAX_TIMEOUT_SECS)
}
#[test]
fn test_timeout_calculation_no_hops() {
// Direct connection (0 hops) should use base timeout
let timeout = calculate_jump_host_timeout(0);
assert_eq!(
timeout, 30,
"Direct connection should use 30 second timeout"
);
}
#[test]
fn test_timeout_calculation_single_hop() {
// 1 hop: 30 + (15 * 1) = 45 seconds
let timeout = calculate_jump_host_timeout(1);
assert_eq!(timeout, 45, "Single hop should be 45 seconds");
}
#[test]
fn test_timeout_calculation_multiple_hops() {
// Test various hop counts
assert_eq!(calculate_jump_host_timeout(2), 60); // 30 + 30 = 60
assert_eq!(calculate_jump_host_timeout(3), 75); // 30 + 45 = 75
assert_eq!(calculate_jump_host_timeout(5), 105); // 30 + 75 = 105
assert_eq!(calculate_jump_host_timeout(10), 180); // 30 + 150 = 180
}
#[test]
fn test_timeout_calculation_max_allowed_hops() {
// Maximum allowed hops (10) should not exceed max timeout
let timeout = calculate_jump_host_timeout(10);
assert_eq!(timeout, 180); // 30 + 150 = 180 (under 600 max)
assert!(
timeout <= 600,
"Timeout should never exceed 600 seconds, got {timeout}"
);
}
#[test]
fn test_timeout_calculation_cap_at_600() {
// Test that timeout is capped at 600 seconds (10 minutes)
// With BASE=30 and PER_HOP=15, we need 38 hops to reach 600
// 30 + (15 * 38) = 30 + 570 = 600
let timeout_38_hops = calculate_jump_host_timeout(38);
assert_eq!(timeout_38_hops, 600, "38 hops should hit max timeout");
let timeout_39_hops = calculate_jump_host_timeout(39);
assert_eq!(
timeout_39_hops, 600,
"39 hops should be capped at max timeout"
);
let timeout_100_hops = calculate_jump_host_timeout(100);
assert_eq!(
timeout_100_hops, 600,
"100 hops should be capped at max timeout"
);
}
#[test]
fn test_timeout_calculation_prevents_integer_overflow() {
// SECURITY TEST: Verify saturating arithmetic prevents overflow
// Test with extremely large hop counts that would overflow without saturation
// usize::MAX would cause overflow without saturation
let timeout = calculate_jump_host_timeout(usize::MAX);
assert_eq!(
timeout, 600,
"Extreme hop count should be capped at max timeout, not overflow"
);
// Test various large numbers
let timeout = calculate_jump_host_timeout(1_000_000);
assert_eq!(timeout, 600, "Very large hop count should be capped");
let timeout = calculate_jump_host_timeout(u64::MAX as usize);
assert_eq!(timeout, 600, "u64::MAX hop count should be capped");
}
#[test]
fn test_timeout_calculation_boundary_conditions() {
// Test values around the 600 second boundary
// 30 + (15 * hop_count) <= 600
// 15 * hop_count <= 570
// hop_count <= 38
// Just under the boundary (38 hops = exactly 600)
assert_eq!(calculate_jump_host_timeout(37), 585); // 30 + 555 = 585
assert_eq!(calculate_jump_host_timeout(38), 600); // 30 + 570 = 600
// Just over the boundary (should cap at 600)
assert_eq!(calculate_jump_host_timeout(39), 600); // Would be 615, capped at 600
assert_eq!(calculate_jump_host_timeout(40), 600); // Would be 630, capped at 600
}
#[test]
fn test_timeout_calculation_consistency() {
// Verify timeout calculation is monotonic and consistent
let mut prev_timeout = 0;
for hop_count in 0..=50 {
let timeout = calculate_jump_host_timeout(hop_count);
// Timeout should never decrease
assert!(
timeout >= prev_timeout,
"Timeout should be monotonic: hop_count={hop_count}, timeout={timeout}, prev={prev_timeout}"
);
// Timeout should never exceed max
assert!(
timeout <= 600,
"Timeout should never exceed 600: hop_count={hop_count}, timeout={timeout}"
);
prev_timeout = timeout;
}
// After enough hops, timeout should stabilize at max
assert_eq!(prev_timeout, 600, "Should reach and maintain max timeout");
}
#[test]
fn test_timeout_calculation_realistic_scenarios() {
// Test realistic jump host scenarios
// Single bastion (most common)
assert_eq!(calculate_jump_host_timeout(1), 45);
// Double bastion (common in high-security environments)
assert_eq!(calculate_jump_host_timeout(2), 60);
// Triple bastion (less common but used)
assert_eq!(calculate_jump_host_timeout(3), 75);
// Maximum allowed by MAX_JUMP_HOSTS (10)
let max_allowed_timeout = calculate_jump_host_timeout(10);
assert!(
max_allowed_timeout <= 600,
"Even max allowed hops should be reasonable"
);
assert_eq!(max_allowed_timeout, 180); // Well under 600 seconds
}
#[test]
fn test_timeout_formula_correctness() {
// Verify the formula: timeout = BASE + (PER_HOP * hop_count), capped at MAX
for hop_count in 0..=100 {
let timeout = calculate_jump_host_timeout(hop_count);
let expected_uncapped = 30 + (15 * hop_count as u64);
let expected = expected_uncapped.min(600);
assert_eq!(
timeout, expected,
"Formula mismatch at hop_count={hop_count}: got {timeout}, expected {expected}"
);
}
}