feat: add anchor, a protocol to share proxy in Lan #191
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WalkthroughThe changes introduced in this pull request involve the addition of new constants, methods, variables, and preferences related to LAN discovery functionality within the application. Key modifications include the introduction of a new constant for LAN discovery, methods for accessing this setting, and updates to the user interface preferences. Additionally, new files have been created to handle anchor service requests, and localization has been expanded to support new string resources. Overall, these changes enhance the application's capabilities regarding local network discovery. Changes
Sequence Diagram(s)sequenceDiagram
participant User
participant Settings
participant DataStore
participant NativeInterface
participant AnchorService
User->>Settings: Modify discoveryInLan preference
Settings->>DataStore: Update discoveryInLan value
Settings->>NativeInterface: Call allowDiscoveryByLan()
NativeInterface->>DataStore: Retrieve discoveryInLan value
DataStore-->>NativeInterface: Return discoveryInLan value
NativeInterface-->>Settings: Return value
Settings-->>User: Update UI based on discoveryInLan
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Signed-off-by: HystericalDragon <[email protected]>
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Actionable comments posted: 10
🧹 Outside diff range and nitpick comments (11)
libcore/anchor/option.go (1)
1-12: Address security concerns and improve documentation for the anchor protocolWhile the basic structure of the
Optionsstruct is in place, there are several areas that need attention given the security concerns mentioned in the PR description:
- Improve documentation throughout the file, especially for the
Optionsstruct and its fields.- Implement robust validation for the
Optionsstruct to prevent misuse.- Consider the security implications of using the external
authpackage and ensure it meets the security requirements of the anchor protocol.- Add unit tests to verify the behavior and security of the
Optionsstruct.- Consider implementing encryption for sensitive fields like
Userto enhance security.Given that the PR mentions vulnerabilities in the anchor protocol, it's crucial to address these concerns before merging. Additionally, once the proof of concept (POC) demonstrating the vulnerabilities is available, ensure that this code is reviewed and updated accordingly to mitigate any identified issues.
Consider implementing the following security measures:
- Use a secure random number generator for generating any session keys or tokens.
- Implement rate limiting to prevent brute force attacks.
- Use TLS for all network communications to ensure data integrity and confidentiality.
- Implement proper error handling that doesn't leak sensitive information.
Would you like assistance in implementing any of these security measures or in creating comprehensive unit tests for this new protocol?
libcore/platform_java.go (1)
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1-17: Summary and next stepsThe addition of
AllowDiscoveryByLan() boolto thePlatformInterfaceis a significant change with potential security implications. While the interface modification itself is straightforward, the implementation and usage of this method require careful consideration.Key points to address:
- Security: Implement robust security measures for the LAN discovery feature.
- Documentation: Provide clear documentation for the new method and its implications.
- Implementation: Ensure all structs implementing
PlatformInterfaceare updated consistently.- Testing: Develop comprehensive tests for the new functionality, including security tests.
Next steps:
- Review and address the security concerns raised in the comments.
- Provide implementation details and usage examples for the new method.
- Update all relevant structs and ensure consistent behavior across platforms.
- Consider breaking down the PR into smaller, more focused changes if additional work is needed to address security concerns.
Please update the PR with additional context, implementation details, and any security measures you've put in place to address the concerns raised.
libcore/go.mod (1)
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1-15: Overall concerns: Security risks and stability issuesThis PR introduces two significant changes that raise concerns about the security and stability of the project:
- The use of an unreleased Go version (1.23.0).
- The integration of a vulnerable "anchor" protocol.
These changes could potentially compromise the security and reliability of the entire application.
Recommendations:
- Revert to the latest stable Go version (1.22.x).
- Postpone the integration of the "anchor" protocol until a thorough security audit is completed.
- If the "anchor" protocol is essential, consider implementing it as an optional, disabled-by-default feature with clear documentation of its risks.
- Establish a security review process for integrating new dependencies, especially those in beta or with known vulnerabilities.
Please address these concerns before merging this PR to maintain the integrity and security of the project.
app/src/main/java/io/nekohasekai/sagernet/bg/NativeInterface.kt (2)
166-166: Approved with a minor suggestion for consistency.The added comment improves code readability by providing context for the SDK version check. However, for consistency with the code, consider updating the comment to mention both SDK 30 and Android 11.
Consider updating the comment as follows:
- override fun usePlatformInterfaceGetter(): Boolean { - return SDK_INT >= Build.VERSION_CODES.R // SDK 30 (Android 11) + override fun usePlatformInterfaceGetter(): Boolean { + return SDK_INT >= Build.VERSION_CODES.R // SDK 30 (Android 11) or later }
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1-170: Overall concerns: Security and documentation improvements neededWhile the changes implement the basic functionality for LAN discovery as mentioned in the PR objectives, there are significant concerns that need to be addressed:
Security Vulnerabilities: The PR objectives explicitly mention vulnerabilities in the new protocol, but the implementation doesn't include any visible security measures to mitigate these risks.
Lack of Documentation: There's no comprehensive documentation explaining the new feature, its usage, or associated risks.
Insufficient Error Handling: The current implementation doesn't include any error handling or validation for the LAN discovery feature.
Recommendations:
- Implement robust security measures such as authentication, encryption, or access controls for the LAN discovery feature.
- Add thorough documentation explaining the feature, its intended use, potential risks, and any implemented security measures.
- Implement proper error handling and validation for the LAN discovery functionality.
- Consider adding unit tests to ensure the correct behavior of the new feature.
- Conduct a security audit of the entire LAN discovery implementation before merging this PR.
These improvements are crucial to ensure the safety and reliability of the new feature, especially given the mentioned vulnerabilities in the PR objectives.
app/src/main/java/io/nekohasekai/sagernet/Constants.kt (1)
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1-324: Summary: New constant added for LAN discovery feature with security implicationsThe addition of the
DISCOVERY_IN_LANconstant is the only change in this file. While the constant itself is appropriately named and placed, it represents a feature (LAN discovery for the "anchor" protocol) that has been flagged as having security vulnerabilities.Given the sensitive nature of network-related features, especially those involving local network discovery:
- Ensure that a comprehensive security review is conducted for the entire "anchor" protocol implementation.
- Consider adding code comments near this constant to highlight its security-sensitive nature.
- Implement robust error handling and input validation in the code that uses this constant.
- Plan for regular security audits of this feature as the project evolves.
To enhance the security posture:
- Consider implementing a feature flag system that allows quick disabling of this feature if vulnerabilities are discovered in production.
- Add logging and monitoring specifically for this feature to detect potential abuse or unexpected behavior.
app/src/main/java/io/nekohasekai/sagernet/ui/SettingsPreferenceFragment.kt (1)
Security Concerns Remain Unaddressed
The verification reveals that while there are references to security-related keys, their implementations are either empty or potentially expose insecure settings:
Key.SECURITY_ADVISORYis present but not implemented.Key.ALLOW_INSECURE_ON_REQUESTallows insecure requests without safeguards.- User warnings about security implications are not adequately handled.
Actions Needed:
Implement Security Advisories:
- Properly handle
Key.SECURITY_ADVISORYto inform users about potential risks.Restrict Insecure Settings:
- Re-evaluate the usage of
ALLOW_INSECURE_ON_REQUESTto ensure it doesn't expose vulnerabilities.Enhance User Warnings:
- Add clear warnings or confirmations when users enable settings that could compromise security.
🔗 Analysis chain
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1-324: Overall LGTM, but please address security concerns.The changes successfully introduce new preferences for allowing access and discovery in LAN, aligning with the PR objectives. The implementation is generally correct and follows existing code patterns.
However, there are some important points to address:
- The PR objectives mention that the new "anchor" protocol has vulnerabilities that make it easy to exploit. This is a significant security concern that is not addressed in the code changes.
- There's no implementation of safeguards or warnings to users about the potential risks of enabling these new preferences.
Please consider the following:
- Implement appropriate security measures to mitigate the mentioned vulnerabilities.
- Add user warnings or confirmations when enabling these potentially risky preferences.
- Include comments in the code explaining the security implications and any implemented safeguards.
To verify the security implications, please run the following script:
This script will help verify if appropriate security measures and user warnings have been implemented. Please review the results and make necessary adjustments to address the security concerns mentioned in the PR objectives.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Check for security-related comments and implementations # Test 1: Search for security-related comments echo "Searching for security-related comments:" rg --type kotlin "(?i)security|vulnerability|risk|exploit" app/src/main/java/io/nekohasekai/sagernet/ui/SettingsPreferenceFragment.kt # Test 2: Check for user warning implementations echo "Checking for user warning implementations:" rg --type kotlin "(?i)warning|alert|confirm" app/src/main/java/io/nekohasekai/sagernet/ui/SettingsPreferenceFragment.kt # Test 3: Look for any encryption or security measure implementations echo "Searching for security measure implementations:" rg --type kotlin "(?i)encrypt|secure|protect" app/src/main/java/io/nekohasekai/sagernet/ui/SettingsPreferenceFragment.ktLength of output: 985
app/src/main/res/xml/global_preferences.xml (1)
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1-373: Careful consideration needed for new LAN discovery featureThe addition of the local network discovery preference introduces a new feature for sharing proxies within a LAN. While this can be useful, it's crucial to approach it with caution due to the mentioned security vulnerabilities.
- Ensure that the backend implementation of the "anchor" protocol includes robust security measures to mitigate the vulnerabilities mentioned in the PR description.
- Consider adding user-facing warnings and documentation about the potential risks of enabling this feature.
- Implement proper access controls and authentication mechanisms for the LAN proxy sharing functionality.
- Conduct thorough security testing before merging this feature into the main branch.
It's recommended to have a separate security review for the "anchor" protocol implementation to ensure all potential vulnerabilities are addressed.
app/src/main/java/io/nekohasekai/sagernet/database/DataStore.kt (1)
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1-391: Summary: Minimal change with significant security implicationsThe addition of the
discoveryInLanproperty is the only change in this file, but it has potentially far-reaching security implications. While the feature aims to enable proxy sharing in LAN, which could be beneficial for certain use cases, it also introduces vulnerabilities as mentioned in the PR description.Recommendations for the broader implementation:
- Implement a comprehensive security review of the "anchor" protocol before proceeding with the implementation.
- Consider adding a separate configuration class for LAN discovery settings, which could include additional security parameters.
- Implement logging and monitoring for LAN discovery activities to detect potential abuse.
- Create a user-facing documentation explaining the risks and best practices for using this feature.
- Plan for regular security audits and updates to address potential vulnerabilities in the LAN discovery feature.
These steps will help balance the functionality benefits with the necessary security precautions.
app/src/main/res/values/strings.xml (1)
658-658: LGTM, but consider security implications.The new string resource for enabling local network discovery is well-named and clearly describes its purpose. This aligns with the PR objective of introducing the "anchor" protocol for sharing proxies within a LAN.
However, it's important to note that enabling local network discovery can have security implications. Ensure that:
- Users are informed about the potential risks of enabling this feature.
- Proper security measures are implemented in the code handling local network discovery to prevent unauthorized access or data leakage.
- Consider adding a warning or information dialog when users attempt to enable this feature.
Would you like assistance in drafting user-facing documentation or warnings about the security implications of this feature?
libcore/anchor/service.go (1)
97-97: Avoid logging sensitive informationLogging
query.DeviceNameon line 97 may expose sensitive information in the logs. IfDeviceNamecontains personal or confidential data, this could be a security concern.Consider removing or masking sensitive data from logs:
-a.logger.TraceContext(a.ctx, "Anchor: device name: ", query.DeviceName) +a.logger.TraceContext(a.ctx, "Anchor: received query from a device")
📜 Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
⛔ Files ignored due to path filters (1)
libcore/go.sumis excluded by!**/*.sum
📒 Files selected for processing (12)
- app/src/main/java/io/nekohasekai/sagernet/Constants.kt (1 hunks)
- app/src/main/java/io/nekohasekai/sagernet/bg/NativeInterface.kt (1 hunks)
- app/src/main/java/io/nekohasekai/sagernet/database/DataStore.kt (1 hunks)
- app/src/main/java/io/nekohasekai/sagernet/ui/SettingsPreferenceFragment.kt (3 hunks)
- app/src/main/res/values-zh-rCN/strings.xml (1 hunks)
- app/src/main/res/values/strings.xml (1 hunks)
- app/src/main/res/xml/global_preferences.xml (1 hunks)
- libcore/anchor/option.go (1 hunks)
- libcore/anchor/service.go (1 hunks)
- libcore/box.go (3 hunks)
- libcore/go.mod (1 hunks)
- libcore/platform_java.go (1 hunks)
🔇 Additional comments (15)
libcore/anchor/option.go (3)
1-1: LGTM: Package declaration is appropriate.The package name
anchoraligns with the directory structure and the PR objectives.
7-12:⚠️ Potential issueAdd documentation and consider security implications of the Options struct.
The
Optionsstruct lacks documentation for its fields. Given the security concerns mentioned in the PR description, it's crucial to provide clear documentation and consider potential security implications:
- Add comments explaining the purpose and any constraints for each field.
- Consider adding validation methods to ensure the integrity of the data, especially for
SocksPortandDnsPort.- Document any security considerations related to the
Userfield and how it's used in authentication.- Explain the role of
DeviceNamein the protocol and any associated risks.Here's a suggested improvement with added comments:
type Options struct { // SocksPort is the port number for the SOCKS proxy. Must be between 1-65535. SocksPort uint16 // User represents the authenticated user. Ensure proper authentication mechanisms are in place. User auth.User // DnsPort is the port number for DNS queries. Must be between 1-65535. DnsPort uint16 // DeviceName is a unique identifier for the device in the LAN. Ensure it's properly sanitized to prevent injection attacks. DeviceName string } // Validate checks if the Options are valid and secure func (o *Options) Validate() error { // Add validation logic here // e.g., check if ports are in valid range, DeviceName is properly formatted, etc. }To ensure the
Optionsstruct is used securely throughout the codebase, run the following script:
3-5: Verify the necessity and security of the imported auth package.The import of
github.com/sagernet/sing/common/authis used for theauth.Usertype. Given the security concerns mentioned in the PR description, it's crucial to ensure this package is necessary and secure.Please confirm:
- Is this the most appropriate package for handling user authentication in this context?
- Has this package been audited for security vulnerabilities?
- Are there any known issues or limitations with this package that could affect the security of the "anchor" protocol?
Run the following script to check for any security advisories related to this package:
libcore/platform_java.go (1)
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1-17: Consider broader implications of interface changeThe addition of
AllowDiscoveryByLan() boolto thePlatformInterfacehas several implications:
- All structs implementing this interface will need to be updated to include this method, which could affect multiple parts of the codebase.
- The method's boolean return type suggests it's a simple permission check. Consider whether this is sufficient for the intended functionality and security requirements.
- The placement at the end of the interface is good for backward compatibility, but ensure all implementations are updated consistently.
To assess the impact, let's check for existing implementations of
PlatformInterface:#!/bin/bash # Search for structs implementing PlatformInterface echo "Searching for PlatformInterface implementations:" rg --type go "type.*struct.*{[\s\S]*?}.*\n.*PlatformInterface"Consider the following recommendations:
- Document the expected behavior of
AllowDiscoveryByLan()in the interface definition.- Review all implementations to ensure they correctly and securely implement this new method.
- Consider adding integration tests to verify the behavior of this method across different platforms or configurations.
- Evaluate whether additional methods or parameters are needed to support secure LAN discovery and proxy sharing.
Would you like help in identifying all affected implementations or drafting documentation for this interface change?
libcore/go.mod (2)
15-15:⚠️ Potential issueSecurity Concern: Integration of vulnerable "anchor" protocol
The addition of the
github.com/xchacha20-poly1305/anchordependency introduces a protocol that has known vulnerabilities, as mentioned in the PR description. This poses significant security risks to the application.Before proceeding with the integration of this protocol:
- Conduct a thorough security audit of the "anchor" protocol.
- Document all known vulnerabilities and their potential impact.
- Implement necessary security measures to mitigate the risks.
- Consider using a stable version instead of a beta release for production code.
To assess the current state of the "anchor" repository and any recent security updates, run:
#!/bin/bash # Check the latest commit and issues in the anchor repository echo "Latest commit:" gh repo view github.com/xchacha20-poly1305/anchor --json lastCommit --jq '.lastCommit.messageHeadline' echo "Recent issues:" gh issue list --repo github.com/xchacha20-poly1305/anchor --limit 5 --json title,labels
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1-4: Caution: Using unreleased Go version 1.23.0The Go version specified (1.23.0) is not an official release as of October 2024. Using an unreleased version in production code can lead to compatibility issues, unexpected behavior, and potential security vulnerabilities.
Consider using the latest stable version of Go (1.22.x as of October 2024) instead. If you require specific features from the unreleased version, please document the reasons and potential risks.
-// 1.23.0: https://go.dev/doc/go1.23#timer-changes -go 1.23.0 +// Use the latest stable version +go 1.22.0To verify the latest stable Go version, run:
app/src/main/java/io/nekohasekai/sagernet/Constants.kt (1)
52-52:⚠️ Potential issueSecurity concern: Potential vulnerabilities in LAN discovery feature
The addition of
DISCOVERY_IN_LANsuggests the implementation of a LAN discovery feature for the "anchor" protocol mentioned in the PR description. However, the PR also notes that this protocol has vulnerabilities that make it easy to exploit by attackers.
- Could you provide more details about the specific vulnerabilities in the "anchor" protocol?
- What security measures are being implemented to mitigate these vulnerabilities?
- Is this feature disabled by default? If not, consider making it opt-in rather than opt-out.
- Are there any plans to add user warnings or documentation about the potential risks of enabling this feature?
To better understand the implementation and usage of this new constant, please run the following script:
app/src/main/java/io/nekohasekai/sagernet/ui/SettingsPreferenceFragment.kt (3)
67-69: LGTM. Please provide more context on the new preferences.The addition of
allowAccessanddiscoveryInLanpreferences aligns with the PR's objective of introducing the "anchor" protocol for sharing proxies in LAN.Could you please provide more information about the specific functionality these preferences control and any potential security implications?
183-184: LGTM. Consider adding explanatory comments.The initialization of
allowAccessanddiscoveryInLanpreferences is correctly implemented within theINBOUND_SETTINGScategory.To improve code maintainability, consider adding brief comments explaining the purpose and potential security implications of these new preferences.
283-284: LGTM. Consider adding a comment explaining the relationship.The enabled state of
discoveryInLanis correctly linked tobypassLan, and the change listener is appropriately set to trigger a reload.Consider adding a brief comment explaining why
discoveryInLanis enabled only whenbypassLanis checked, to improve code clarity.app/src/main/java/io/nekohasekai/sagernet/database/DataStore.kt (1)
115-115:⚠️ Potential issueSecurity concern: Carefully consider the implications of enabling LAN discovery
The addition of the
discoveryInLanproperty is likely related to the new "anchor" protocol for sharing proxies in LAN. While this feature can enhance functionality, it also introduces potential security risks:
- Exposure: Enabling this feature could make the device discoverable on the local network, potentially exposing it to unauthorized access attempts.
- Attack surface: As mentioned in the PR description, there are vulnerabilities in the protocol that make it easy to exploit by attackers.
Consider the following recommendations:
- Ensure this feature is disabled by default to minimize potential security risks.
- Implement strong authentication and encryption mechanisms for LAN discovery and proxy sharing.
- Add clear user warnings about the potential risks when enabling this feature.
- Consider adding a time-based or session-based automatic disable feature for this setting.
To verify the default state and usage of this property, you can run the following script:
This script will help identify where and how the
DISCOVERY_IN_LANkey is defined and used, allowing us to verify its default state and implementation.app/src/main/res/values-zh-rCN/strings.xml (3)
591-591: LGTM: New string resource aligns with PR objective.The added string resource
enable_local_network_discoverywith the translation "允许局域网发现" (Allow local network discovery) is well-formatted and appropriately placed. This addition aligns with the PR objective of introducing the "anchor" protocol for sharing proxies within a LAN.
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1-592: Overall file review: LGTM with a suggestion for improvement.The changes to this file are minimal and well-implemented. The new string resource for enabling local network discovery has been added correctly and is consistent with the existing format. The file structure remains intact, and no other issues are apparent.
To summarize:
- The new string resource has been added successfully.
- The addition aligns with the PR objective of introducing the "anchor" protocol.
- A suggestion has been made to add a warning message about potential security risks.
Once the suggested warning message is added (if deemed necessary), this file should be ready for merge.
591-591: Consider adding a security warning for this feature.While the new string resource accurately describes the feature, it's important to note that the PR description mentions vulnerabilities in the "anchor" protocol. Consider adding an additional string resource to warn users about potential security risks when enabling local network discovery. This could be displayed as a disclaimer or warning message in the UI when users attempt to enable this feature.
Example:
<string name="enable_local_network_discovery_warning">Warning: Enabling this feature may expose your device to security risks on the local network. Use with caution.</string>This addition would help users make an informed decision about using the feature.
To ensure this warning is properly implemented, you can run the following script to check for the presence of a warning string:
If the script doesn't return any results, it indicates that a warning string hasn't been added yet.
libcore/anchor/service.go (1)
66-68:⚠️ Potential issueCorrect invalid use of
context.AfterFuncThe function
context.AfterFuncused on line 66 is not part of the standard Gocontextpackage. It seems you intended to usetime.AfterFunc, which executes a function after a specified duration.Please update the code to use
time.AfterFuncand specify the desired duration. For example:-stop := context.AfterFunc(a.ctx, func() { +stop := time.AfterFunc(time.Duration(/* duration */), func() { _ = a.Close() })To verify whether
context.AfterFuncis defined elsewhere in the codebase, you can run the following script:✅ Verification successful
Confirmed: Replace
context.AfterFuncwithtime.AfterFunc
- The
context.AfterFuncfunction is not defined in the codebase.- Please update the code to use
time.AfterFuncwith the desired duration.🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Check if `context.AfterFunc` is defined in the project. # Test: Search for any definitions of `AfterFunc` in the `context` package. # Expect: No definitions found; `AfterFunc` is not part of `context`. rg --type go --files-with-matches --fixed-strings "func (c *Context) AfterFunc" | xargs grep -n "func (c *Context) AfterFunc"Length of output: 127
Script:
#!/bin/bash # Description: Search for any definitions of `AfterFunc` in the entire codebase. rg --type go 'func\s+AfterFunc\s*\('Length of output: 38
app/src/main/java/io/nekohasekai/sagernet/ui/SettingsPreferenceFragment.kt
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- libcore/box.go (3 hunks)
🔇 Additional comments (4)
libcore/box.go (4)
5-5: LGTM: Import ofnet/netippackage.The addition of the
net/netipimport is appropriate for the new functionality introduced in this file.
23-23: LGTM: Import oflibcore/anchorpackage.The addition of the
libcore/anchorimport is appropriate for the new anchor service functionality introduced in this file.
136-141: LGTM: Anchor service creation and additionThe creation of the anchor service and its addition to
b.servicesis implemented correctly. The error handling is appropriate, logging a warning if the service creation fails.
115-142: Address security concerns mentioned in PR descriptionWhile the implementation of the anchor service aligns with the PR objectives, the PR description mentions vulnerabilities that make the protocol easy to exploit by attackers. However, the current implementation doesn't seem to address these security concerns explicitly.
To ensure we're not overlooking any security measures, let's check for any security-related code:
#!/bin/bash # Description: Search for security-related code in the anchor implementation rg --type go 'anchor\.New' -C 10 rg --type go 'anchor\.Options' -C 10Consider the following recommendations:
- Implement proper authentication and encryption mechanisms for the anchor protocol to mitigate potential attacks.
- Add rate limiting and access controls to prevent abuse of the service.
- Include comprehensive logging and monitoring to detect and respond to potential security incidents.
- Document the known vulnerabilities and any mitigations or best practices for users of this feature.
Would you like assistance in implementing these security measures or in creating a separate issue to track this security concern?
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Since the protocol is easy to exploit by attackers, a POC will be released soon.
Summary by CodeRabbit
Release Notes
New Features
Localization
Bug Fixes
These updates improve user control over network discovery settings and enhance the overall user experience.