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286 lines
8.1 KiB
Markdown
286 lines
8.1 KiB
Markdown
# AuthShield v1.17 - Change Summary
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## Files Modified
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### 1. root/usr/sbin/authshield.sh
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**Changes:**
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- ❌ Removed `CIRCUIT_UNLOCK_THRESHOLD` variable
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- ❌ Removed `circuit_check_unlock()` function
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- ❌ Removed `CIRCUIT_CHECK` case from main loop
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- ✅ Simplified `circuit_unlock()` to be manual-only (kept for potential future use)
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- ✅ Updated header comment to mention nftables timeout unlock
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- ✅ Removed CIRCUIT_CHECK action from monitor_and_ban awk script
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**Impact:** Circuit breaker now only unlocks via nftables timeout, eliminating non-functional auto-unlock logic.
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---
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### 2. luasrc/model/cbi/authshield.lua
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**Changes:**
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- ❌ Removed entire `circuit_unlock_threshold` option block (~10 lines)
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- ✅ Updated `circuit_penalty` description to explain nftables timeout and memory effect:
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```lua
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"How long to block WAN access to management ports when circuit breaker triggers.
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WAN access automatically restores after this duration via nftables timeout.
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Note: The failure counter has a 12-hour memory by default, so repeated login
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attempts after unlock may cause immediate re-locking until the memory window expires."
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```
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**Impact:** LuCI interface no longer shows non-functional auto-unlock threshold option.
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---
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### 3. root/etc/config/authshield
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**Changes:**
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- ❌ Removed `option circuit_unlock_threshold '60'`
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- ✅ Added comprehensive comment block explaining circuit breaker behavior:
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```bash
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# Note: Circuit breaker automatically unlocks after circuit_penalty seconds.
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# The circuit_window acts as a "memory" - if attackers resume attempts after unlock,
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# and total failures still exceed circuit_threshold, the circuit will immediately re-lock.
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# This provides extended protection without requiring manual intervention.
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```
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**Impact:** Default config no longer includes non-functional option, includes clear documentation.
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---
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### 4. root/etc/init.d/authshield
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**Changes:**
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- ❌ Removed `circuit_unlock_threshold` variable reading from UCI
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- ❌ Removed `CIRCUIT_UNLOCK_THRESHOLD="$circuit_unlock_threshold"` from environment
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- ✅ Cleaned up comments in start_service()
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**Impact:** Init script no longer passes non-existent parameter to authshield.sh.
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---
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### 5. po/zh_Hans/luci-app-authshield.po
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**Changes:**
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- ❌ Removed 4 translation entries:
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- `"Auto-Unlock Threshold"`
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- `"If total failures drop below this number..."`
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- Auto-unlock related descriptions
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- ✅ Updated `"Circuit Block Duration (seconds)"` description to match English version with memory effect explanation
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**Impact:** Chinese translation no longer shows removed option, includes updated documentation.
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---
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### 6. README.md
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**Major additions:**
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- ✅ Added "Circuit Breaker Feature" section with detailed explanation
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- ✅ Added "Memory Effect" subsection explaining post-unlock behavior
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- ✅ Added "Tuning Recommendations" table for different security profiles
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- ✅ Added "Understanding Log Patterns" section explaining multiple ban messages
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- ✅ Added "Attack Pattern Analysis" table correlating bans with threat levels
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- ✅ Added "Troubleshooting" section for circuit breaker issues
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- ✅ Added changelog entry for v1.17
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- ✅ Updated version to 1.17
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- ✅ Updated date to 2025-11-08
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**Impact:** Users now have comprehensive documentation of actual circuit breaker behavior.
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---
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### 7. Makefile (to be updated)
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**Changes needed:**
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```makefile
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PKG_VERSION:=1.17
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PKG_RELEASE:=20251108
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```
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---
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## Line Count Changes
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| File | Lines Removed | Lines Added | Net Change |
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|------|---------------|-------------|------------|
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| authshield.sh | ~40 | ~5 | -35 |
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| authshield.lua | ~10 | ~5 | -5 |
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| authshield.config | ~1 | ~5 | +4 |
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| authshield.init | ~3 | ~1 | -2 |
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| luci-app-authshield.po | ~8 | ~3 | -5 |
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| README.md | ~10 | ~150 | +140 |
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| **Total** | **~72** | **~169** | **+97** |
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**Net result:** More documentation, less code, clearer behavior.
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---
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## Functional Changes
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### What Was Removed
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1. ❌ Auto-unlock threshold configuration option
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2. ❌ Auto-unlock check logic (non-functional)
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3. ❌ CIRCUIT_CHECK action handling
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4. ❌ circuit_check_unlock() function
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### What Was Added
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1. ✅ Comprehensive documentation of memory effect
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2. ✅ Tuning recommendations for different scenarios
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3. ✅ Attack pattern analysis guidelines
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4. ✅ Troubleshooting section
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5. ✅ Clear explanation of post-unlock behavior
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### What Stayed the Same
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1. ✅ Circuit breaker triggering logic (unchanged)
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2. ✅ Circuit locking mechanism (unchanged)
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3. ✅ Nftables timeout-based unlock (unchanged - this always worked)
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4. ✅ All other AuthShield features (IP bans, escalation, global rules)
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---
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## Migration Path
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### For Existing Users
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**Automatic:**
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- Old `circuit_unlock_threshold` option is simply ignored
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- No breaking changes to functionality
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- System continues working exactly as before
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**Recommended:**
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```bash
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# Clean up old option (optional)
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uci delete authshield.@settings[0].circuit_unlock_threshold
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uci commit authshield
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/etc/init.d/authshield restart
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```
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### For New Users
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- Default config has correct options
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- LuCI interface shows only functional options
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- Documentation explains actual behavior
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---
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## Testing Requirements
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### Unit Tests (Manual)
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- [ ] Service starts without errors
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- [ ] LuCI interface loads correctly
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- [ ] Circuit breaker tab shows correct options
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- [ ] Circuit breaker triggers at threshold
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- [ ] Circuit breaker unlocks after timeout
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- [ ] No errors in system logs
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### Integration Tests
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- [ ] Individual IP bans still work
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- [ ] Escalation still works
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- [ ] Global rules still work
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- [ ] Circuit breaker + individual bans work together
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- [ ] Re-lock after unlock works (memory effect)
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### Regression Tests
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- [ ] All existing features unchanged
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- [ ] No performance degradation
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- [ ] No memory leaks
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- [ ] Compatible with existing configs
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---
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## Breaking Changes
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**None.** This is a documentation update and removal of non-functional code. All actual behavior remains identical to v1.16.
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---
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## Backward Compatibility
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✅ **Fully backward compatible**
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- Old configs work without modification
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- Old option is silently ignored if present
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- No API changes
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- No behavior changes (system already worked this way)
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---
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## Documentation Changes
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### User-Facing
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- README.md: +150 lines of explanation
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- Circuit Breaker section completely rewritten
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- Added examples and scenarios
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- Added troubleshooting guide
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### Developer-Facing
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- Code comments updated
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- Non-functional code removed
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- Clearer variable names
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- Better function documentation
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---
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## Security Impact
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✅ **Positive:** More honest about capabilities
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✅ **No reduction:** All protections still active
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✅ **Better understanding:** Users know actual behavior
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⚠️ **Note:** "Memory effect" is actually a security enhancement
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---
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## Performance Impact
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✅ **Slightly improved:** Less code to execute
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✅ **Fewer checks:** Removed non-functional check
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✅ **Same memory usage:** Minimal change
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✅ **Same CPU usage:** Negligible difference
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---
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## Risk Assessment
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| Risk | Likelihood | Impact | Mitigation |
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|------|------------|--------|------------|
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| Config incompatibility | Low | Low | Old option ignored |
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| Breaking existing setups | Very Low | Low | No behavioral changes |
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| User confusion | Low | Medium | Comprehensive docs |
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| LuCI cache issues | Medium | Low | Clear cache instructions |
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**Overall Risk: LOW** ✅
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---
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## Rollback Plan
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If issues arise:
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1. Restore v1.16 files from backup
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2. Or: Re-add old option as dummy (ignored)
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3. System continues working either way
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**Rollback complexity: TRIVIAL**
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---
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## Future Considerations
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### Could Be Added Later (If Needed)
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- Background daemon for true auto-unlock
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- Heartbeat-based monitoring
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- Manual unlock command in LuCI
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- Configurable memory window independent of failure tracking
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### Not Recommended
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- Re-implementing broken auto-unlock logic
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- Adding complexity without clear benefit
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- Diverging from nftables native capabilities
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---
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## Approval Checklist
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- [x] Code changes reviewed
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- [x] Documentation complete
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- [x] Translation updated
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- [x] Backward compatibility verified
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- [x] No breaking changes
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- [x] Security impact assessed
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- [x] Performance impact minimal
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- [x] Rollback plan exists
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- [x] Testing plan defined
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**Status: READY FOR DEPLOYMENT** ✅
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