fix: send domain name to custom detction rule manager for processing ntw rule - #481
fix: send domain name to custom detction rule manager for processing ntw rule#481Prateek-stepsecurity wants to merge 1 commit into
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Code Comments
dnsproxy.go
- [High]Ensure correct and consistent function arguments based on function expectations
Changing the argument passed toproxy.submitDNSEventfromanswer.Data(presumably an IP address) todomainmight break the expected behavior ifsubmitDNSEventexpects an IP address. This can cause unexpected bugs or compromised data handling. According to the principle of least astonishment (source: "Clean Code" by Robert C. Martin), functions should be used as intended to maintain clarity and reliability. Verify the expected argument type forsubmitDNSEvent. If it expects an IP address, revert the change back toanswer.Data. Otherwise, update the function signature and documentation ofsubmitDNSEventto accept and handle a domain string appropriately. - [Medium]Add error handling or context for asynchronous calls launched via goroutines
The code fires off goroutines forsendDNSRecordandsubmitDNSEventwithout any error capture or propagation. This can lead to silent failures which are difficult to debug or may cause inconsistent system state. According to Google's Go best practices (https://github.com/golang/go/wiki/CodeReviewComments#goroutines), goroutines should ideally signal errors via channels or sync mechanisms. Implement error channels or context cancellation to catch errors fromsendDNSRecordandsubmitDNSEvent. For example, have these functions return errors on a channel that the caller can listen to and handle appropriately. - [Medium]Use explicit variable naming and data passing clarity
The variableanswer.Datais passed in one instance but replaced withdomainin another call tosubmitDNSEvent. This inconsistency may cause confusion for maintainers. According to naming conventions recommended by Effective Go (https://golang.org/doc/effective_go#names), variables and parameters should be named clearly to reflect their actual data. Confirm and consistently use proper variable names and values. IfsubmitDNSEventexpects domain name, pass domain in both places or rename the function to reflect the expected input. - [Low]Document the assumptions and expectations about the data passed to goroutines
Documentation helps in maintaining and auditing code later. Per the Go documentation standards (https://blog.golang.org/godoc-documenting-go-code), functions especially those executed concurrently should have comments that state what data is passed and any thread-safety constraints. Add comments above the goroutine launches describing what data is being passed and any side effects or dependencies.
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…ntw rule Signed-off-by: prateek-stepsecurity <prateek@stepsecurity.io>
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Code Comments
dnsproxy.go
- [High]Avoid spawning goroutines with data races or inconsistent parameters
The original code invoked submitDNSEvent with answer.Data, but the modified code calls submitDNSEvent with domain. If submitDNSEvent expects the IP address (answer.Data) and is now given domain instead, this can lead to inconsistent data being sent and potential race conditions or data integrity issues. According to the Go concurrency patterns outlined in the Go blog and Effective Go, careful attention must be paid to what data is passed into goroutines to avoid race conditions and logic errors. Confirm that submitDNSEvent is intended to process the domain string rather than the IP address. If the function semantic has not changed, revert the argument to answer.Data or adjust the function signature accordingly. Alternatively, refactor submitDNSEvent to clearly document and handle the expected input appropriately to avoid confusion and data mismatch. - [Medium]Handle errors from goroutines or consider context cancellation
The goroutines invoke functions asynchronously without any error handling or context for cancellation. This makes debugging harder if submitDNSEvent or sendDNSRecord fail silently. Best practices advise managing goroutine life cycles with contexts and capturing errors when appropriate. The Go Blog and 'Concurrency in Go' books emphasize graceful error handling in concurrency. Modify submitDNSEvent and sendDNSRecord to accept a context, return errors over channels, or use sync mechanisms to track success or failure. For example, use channels to report errors back to the caller or employ context.Context to allow cancellation and timeouts. - [Low]Document why goroutines are used here
Spawning goroutines for logging or metrics submission (such as submitDNSEvent) should be explicitly commented to provide maintainers context why these are run asynchronously, especially as concurrency is prone to subtle bugs. The Effective Go guidelines recommend clear commenting for concurrency usage. Add comments before the go statements indicating intention, e.g., "// Submit DNS event asynchronously to avoid blocking main flow".
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Code Comments
dnsproxy.go
- [High]Avoid launching goroutines with dynamic input without proper synchronization or context management
Launching goroutines with dynamic input such as domain names or IP addresses without context can lead to race conditions or uncontrolled resource usage if the goroutine depends on variables that may change or if they linger beyond the scope of the request. According to 'Effective Go' and concurrency best practices (Go Blog), goroutines should be controlled or synchronized appropriately. Ensure that context with cancellation or synchronization mechanisms are used when launching goroutines with dynamic input. For example, pass a context.Context down and handle cancellation or errors properly. - [High]Validate and sanitize input parameters passed to asynchronous functions
Passing the domain string directly to submitDNSEvent without validation could lead to processing invalid or malicious input. OWASP Guidelines recommend input validation to prevent injection attacks or logical errors. Add input validation and sanitization on the domain parameter before passing it to submitDNSEvent. Reject or handle empty or malformed domain values appropriately. - [Medium]Avoid launching multiple goroutines without error handling or logging
The goroutine launched for submitDNSEvent executes in the background without any handling for possible errors or panics, which can make debugging difficult and hide runtime problems. Best practices suggest capturing errors and implementing logging for asynchronous processes. Modify submitDNSEvent to return error and wrap the goroutine with recover to prevent panic crashes. Also add logging for errors encountered inside submitDNSEvent. - [Medium]Clarify parameter intent and naming consistency in method calls
The original code passed answer.Data (likely an IP string) to submitDNSEvent, then changed to pass domain string, suggesting confusion about intended parameter. Consistent and clear naming aligned to what submitDNSEvent expects reduces bugs and maintenance issues. According to Clean Code principles (Robert C. Martin), method arguments should be meaningful and clear. Review submitDNSEvent parameter documentation and rename parameters if needed to clarify whether it expects domain or IP. Ensure calls match the expected input consistently. - [Low]Limit use of anonymous goroutines for side-effect-only operations
While launching fire-and-forget goroutines is often convenient, it is preferable to use worker pools or queue-based asynchronous processing, especially for network calls, per 'Go Concurrency Patterns'. That limits unbounded resource usage and provides better flow control. Consider refactoring asynchronous work like submitDNSEvent into a queue or worker pool system rather than spawning goroutines directly.
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