Fix code scanning alert - Incorrect conversion between integer types

[2lambda123]

Tracking issue for:

• [ ] https://github.com/2lambda123/waku-org-go-waku/security/code-scanning/3

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First issue by @2lambda123

Issues Details of @2lambda123 in waku-org-go-waku :	OPEN	CLOSED	TOTAL
1	0	1

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Potential solution

The plan to solve the bug involves ensuring that all integer type conversions are safe and appropriate. This includes validating values before conversion, handling potential overflows, and ensuring consistent use of integer types across the codebase. The reasoning behind this solution is to prevent issues such as data loss, overflow, and underflow, which can occur when converting between different integer types, especially between signed and unsigned integers or different integer sizes.

What is causing this bug?

The bug is caused by incorrect conversions between integer types in various parts of the codebase. These conversions can lead to issues such as data loss, overflow, and underflow. Specifically, the following areas are of concern:

1. Scaling resource limits using conversions between float64, int64, and int.
2. Converting options.ClusterID to uint16 without validation.
3. Converting REST server port and cache capacities to uint without validation.
4. Parsing message size from a string to an integer without handling potential overflow.

Code

Here are the implementation details and code snippets to address the identified issues:

1. Scaling Resource Limits: Ensure that the conversions are safe and handle potential overflows or precision loss.

   memLimit := int64(float64(memory.TotalMemory()) * memPerc / 100)
   fdLimit := int(float64(getNumFDs()) * fdPerc / 100)
   scaledLimits := limits.Scale(memLimit, fdLimit)

2. Cluster ID Conversion: Validate options.ClusterID before converting it to uint16.

   if options.ClusterID > math.MaxUint16 {
      return fmt.Errorf("ClusterID exceeds the maximum value for uint16")
   }
   node.WithClusterID(uint16(options.ClusterID))

3. REST Server Port and Cache Capacities: Validate the values before converting them to uint.

   if options.RESTServer.Port < 0 || options.RESTServer.RelayCacheCapacity < 0 || options.RESTServer.FilterCacheCapacity < 0 {
      return fmt.Errorf("REST server port and cache capacities must be non-negative")
   }
   restConfig := rest.RestConfig{
      Address: options.RESTServer.Address,
      Port: uint(options.RESTServer.Port),
      RelayCacheCapacity: uint(options.RESTServer.RelayCacheCapacity),
      FilterCacheCapacity: uint(options.RESTServer.FilterCacheCapacity),
   }

4. Message Size Parsing: Ensure that the parsed message size does not exceed the maximum value for int.

   msgSize, err := humanize.ParseBytes(msgSizeConfig)
   if err != nil {
      msgSize = 0
   }
   if msgSize > math.MaxInt {
      return math.MaxInt
   }
   return int(msgSize)

How to replicate the bug

To replicate the bug, follow these steps:

1. Set up the gowaku application with the current codebase.
2. Configure the application with values that could cause incorrect integer conversions, such as:
   • Setting ClusterID to a value greater than 65535.
   • Setting negative values for REST server port or cache capacities.
   • Setting a very large message size string that exceeds the maximum value for int.
3. Run the application and observe any errors or unexpected behavior related to integer conversions.

By following these steps, you should be able to observe the issues caused by incorrect integer type conversions and validate that the proposed solution addresses these issues.

File paths and functions/variable names

• File: cmd/waku/node.go

  • Function: setupNode
  • Variables: memLimit, fdLimit, scaledLimits, options.ClusterID, restConfig, msgSize

• File: cmd/waku/options.go

  • Structs: NodeOptions, RESTServerOptions

• File: cmd/waku/flags.go

  • Flags: TcpPort, MaxPeerConnections, ClusterID, Discv5UDPPort, MinRelayPeersToPublish, WebsocketPort, WebsocketSecurePort, RESTPort, MetricsServerPort

By implementing the proposed changes, we ensure that all integer type conversions are handled safely and appropriately, preventing potential bugs and vulnerabilities in the gowaku application.

Click here to create a Pull Request with the proposed solution

Files used for this task:

Changes on cmd/waku/main.go

# Analysis Report for `cmd/waku/main.go` ## Overview The file `cmd/waku/main.go` is the entry point for the `gowaku` application. It sets up the command-line interface (CLI) using the `urfave/cli/v2` package, defines various flags, and executes the main application logic. ## Potential Issue: Incorrect Conversion Between Integer Types The issue reported is related to incorrect conversion between integer types. This can lead to potential bugs, especially when dealing with different integer sizes and signed/unsigned types. ## Review of Integer Conversions In the provided code, there are no explicit integer type conversions. However, the CLI flags defined in the `cliFlags` slice may involve integer values. These flags are defined elsewhere and imported into this file. The potential for incorrect integer conversions may lie in the definitions of these flags or in how they are used in the `Execute` function. ### Flags of Interest The following flags are likely to involve integer values: - `TcpPort` - `MaxPeerConnections` - `PeerStoreCapacity` - `WebsocketPort` - `WebsocketSecurePort` - `ResourceScalingMemoryPercent` - `ResourceScalingFDPercent` - `IPColocationLimit` - `MinRelayPeersToPublish` - `MaxRelayMsgSize` - `Discv5UDPPort` - `MetricsServerPort` - `RESTPort` - `RESTRelayCacheCapacity` - `RESTFilterCacheCapacity` ### Next Steps To ensure that all integer conversions are safe and appropriate, the following steps should be taken: 1. **Inspect Flag Definitions**: Review the definitions of the flags listed above in their respective files to ensure that they are correctly typed and that any conversions are handled properly. 2. **Validate Flag Usage**: Check how these flags are used in the `Execute` function and other parts of the application to ensure that there are no unsafe conversions or assumptions about their types. ## Conclusion The `cmd/waku/main.go` file itself does not contain any explicit integer type conversions. The potential issue likely resides in the definitions or usage of the CLI flags. Further inspection of the flag definitions and their usage in the application is necessary to identify and correct any incorrect integer type conversions.

Changes on cmd/waku/options.go

## Analysis of `cmd/waku/options.go` The file `cmd/waku/options.go` defines various configuration options for different protocols and features used in the `go-waku` service. These options are encapsulated in different structs, each representing a specific protocol or feature. The primary struct, `NodeOptions`, aggregates all these individual options. ### Potential Issues with Integer Type Conversions The primary focus is on identifying any incorrect integer type conversions that could lead to potential bugs. Here are the key points of interest: 1. **DiscV5Options** - `Port` is defined as `uint`. 2. **RelayOptions** - `MinRelayPeersToPublish` is defined as `int`. - `MaxMsgSize` is defined as `string` (not an integer, but worth noting for potential parsing issues). 3. **RLNRelayOptions** - `MembershipIndex` is defined as `*uint`. 4. **FilterOptions** - No integer fields. 5. **LightpushOptions** - No integer fields. 6. **StoreOptions** - `RetentionMaxMessages` is defined as `int`. 7. **DNSDiscoveryOptions** - No integer fields. 8. **MetricsOptions** - `Port` is defined as `int`. 9. **RESTServerOptions** - `Port` is defined as `int`. - `RelayCacheCapacity` is defined as `int`. - `FilterCacheCapacity` is defined as `int`. 10. **WSOptions** - `WSPort` is defined as `int`. - `WSSPort` is defined as `int`. 11. **PeerExchangeOptions** - No integer fields. 12. **RendezvousOptions** - No integer fields. 13. **NodeOptions** - `Port` is defined as `int`. - `ClusterID` is defined as `uint`. - `MaxPeerConnections` is defined as `int`. - `PeerStoreCapacity` is defined as `int`. - `IPColocationLimit` is defined as `int`. ### Observations - The use of both `int` and `uint` types for ports and other counts could potentially lead to issues if not handled correctly, especially when converting between these types. - The `MembershipIndex` in `RLNRelayOptions` is a pointer to `uint`, which could lead to nil pointer dereference issues if not properly checked. - The `MaxMsgSize` in `RelayOptions` is a string, which implies it will need to be parsed into an integer type at some point. This parsing needs to be handled carefully to avoid errors. ### Recommendations 1. **Consistent Use of Integer Types**: - Ensure consistent use of integer types across the codebase. For example, if `Port` is `uint` in one struct, it should be `uint` in all structs unless there's a specific reason for the difference. 2. **Safe Conversions**: - When converting between `int` and `uint`, ensure that the values are within the valid range to prevent overflow or underflow errors. - For example, converting a negative `int` to `uint` can result in a very large number, which is likely unintended. 3. **Pointer Safety**: - Ensure that pointers, such as `MembershipIndex`, are checked for nil before dereferencing to avoid runtime panics. 4. **String Parsing**: - Ensure that the `MaxMsgSize` string is parsed safely into an integer, with proper error handling for invalid formats. ### Conclusion The file `cmd/waku/options.go` does not contain any immediate, obvious incorrect integer type conversions. However, the potential for issues exists due to the mixed use of `int` and `uint` types, as well as the use of pointers and string parsing. Careful review and consistent handling of these types throughout the codebase are recommended to prevent potential bugs.

Changes on cmd/waku/node.go

## Analysis Report ### Overview The file `cmd/waku/node.go` is responsible for setting up and executing a Waku node with various configurations. It includes functions for initializing the node, setting up logging, handling database connections, configuring network settings, and managing different Waku protocols. ### Potential Issues The primary concern mentioned in the issue is "Incorrect conversion between integer types." Here are the potential areas where such issues might arise: 1. **Scaling Resource Limits**: ```go scaledLimits := limits.Scale(int64(float64(memory.TotalMemory())*memPerc/100), int(float64(getNumFDs())*fdPerc/100)) ``` - The conversion from `float64` to `int64` and `int` could potentially lead to precision loss or overflow issues. 2. **Cluster ID Conversion**: ```go node.WithClusterID(uint16(options.ClusterID)) ``` - Converting `options.ClusterID` to `uint16` could lead to data loss if `options.ClusterID` exceeds the range of `uint16`. 3. **REST Server Port**: ```go Port: uint(options.RESTServer.Port), RelayCacheCapacity: uint(options.RESTServer.RelayCacheCapacity), FilterCacheCapacity: uint(options.RESTServer.FilterCacheCapacity) ``` - Converting `options.RESTServer.Port`, `options.RESTServer.RelayCacheCapacity`, and `options.RESTServer.FilterCacheCapacity` to `uint` could lead to issues if the original values are negative. 4. **Message Size Parsing**: ```go return int(msgSize) ``` - The conversion from `uint64` (returned by `humanize.ParseBytes`) to `int` could lead to overflow if the message size is too large. ### Recommendations 1. **Scaling Resource Limits**: - Ensure that the conversions are safe and handle potential overflows or precision loss. ```go memLimit := int64(float64(memory.TotalMemory()) * memPerc / 100) fdLimit := int(float64(getNumFDs()) * fdPerc / 100) scaledLimits := limits.Scale(memLimit, fdLimit) ``` 2. **Cluster ID Conversion**: - Validate `options.ClusterID` before converting it to `uint16`. ```go if options.ClusterID > math.MaxUint16 { return fmt.Errorf("ClusterID exceeds the maximum value for uint16") } node.WithClusterID(uint16(options.ClusterID)) ``` 3. **REST Server Port and Cache Capacities**: - Validate the values before converting them to `uint`. ```go if options.RESTServer.Port < 0 || options.RESTServer.RelayCacheCapacity < 0 || options.RESTServer.FilterCacheCapacity < 0 { return fmt.Errorf("REST server port and cache capacities must be non-negative") } restConfig := rest.RestConfig{ Address: options.RESTServer.Address, Port: uint(options.RESTServer.Port), RelayCacheCapacity: uint(options.RESTServer.RelayCacheCapacity), FilterCacheCapacity: uint(options.RESTServer.FilterCacheCapacity), } ``` 4. **Message Size Parsing**: - Ensure that the parsed message size does not exceed the maximum value for `int`. ```go msgSize, err := humanize.ParseBytes(msgSizeConfig) if err != nil { msgSize = 0 } if msgSize > math.MaxInt { return math.MaxInt } return int(msgSize) ``` ### Conclusion The file contains several areas where incorrect integer type conversions could potentially lead to issues. The recommendations provided should help mitigate these risks by ensuring that all conversions are safe and appropriate for their intended use. Further testing and validation are recommended to ensure that these changes address the identified issues.

Changes on cmd/waku/flags.go

## Analysis Report for `cmd/waku/flags.go` ### Overview The file `cmd/waku/flags.go` defines various command-line flags for configuring the Waku node. These flags are used to set options such as ports, addresses, and other configuration parameters. The flags are defined using the `urfave/cli/v2` package and its `altsrc` extension for alternative sources. ### Potential Issues The primary task is to identify any incorrect integer type conversions that could lead to potential issues. Here are the key points of interest: 1. **Integer Flags**: The file uses several integer flags (`cli.IntFlag`, `cli.UintFlag`, etc.). Incorrect conversions between signed and unsigned integers or between different integer sizes could lead to bugs or vulnerabilities. 2. **Default Values and Destinations**: Ensure that the default values and destinations for these flags are appropriate and do not cause any overflow or underflow issues. ### Detailed Review #### Integer Flags 1. **TcpPort**: ```go TcpPort = altsrc.NewIntFlag(&cli.IntFlag{ Name: "tcp-port", Aliases: []string{"port", "p"}, Value: 60000, Usage: "Libp2p TCP listening port (0 for random)", Destination: &options.Port, EnvVars: []string{"WAKUNODE2_TCP_PORT"}, }) ``` - **Type**: `cli.IntFlag` - **Default Value**: 60000 - **Destination**: `options.Port` (assumed to be of type `int`) - **Analysis**: No issues found. The default value is within the valid range for a TCP port. 2. **MaxPeerConnections**: ```go MaxPeerConnections = altsrc.NewIntFlag(&cli.IntFlag{ Name: "max-connections", Value: 50, Usage: "Maximum allowed number of libp2p connections.", Destination: &options.MaxPeerConnections, EnvVars: []string{"WAKUNODE2_MAX_CONNECTIONS"}, }) ``` - **Type**: `cli.IntFlag` - **Default Value**: 50 - **Destination**: `options.MaxPeerConnections` (assumed to be of type `int`) - **Analysis**: No issues found. The default value is reasonable. 3. **ClusterID**: ```go ClusterID = altsrc.NewUintFlag(&cli.UintFlag{ Name: "cluster-id", Value: 0, Usage: "Cluster id that the node is running in. Node in a different cluster id is disconnected.", Destination: &options.ClusterID, EnvVars: []string{"WAKUNODE2_CLUSTER_ID"}, }) ``` - **Type**: `cli.UintFlag` - **Default Value**: 0 - **Destination**: `options.ClusterID` (assumed to be of type `uint`) - **Analysis**: No issues found. The use of `uint` is appropriate for an ID. 4. **Discv5UDPPort**: ```go Discv5UDPPort = altsrc.NewUintFlag(&cli.UintFlag{ Name: "discv5-udp-port", Value: 9000, Usage: "Listening UDP port for Node Discovery v5.", Destination: &options.DiscV5.Port, EnvVars: []string{"WAKUNODE2_DISCV5_UDP_PORT"}, }) ``` - **Type**: `cli.UintFlag` - **Default Value**: 9000 - **Destination**: `options.DiscV5.Port` (assumed to be of type `uint`) - **Analysis**: No issues found. The default value is within the valid range for a UDP port. 5. **MinRelayPeersToPublish**: ```go MinRelayPeersToPublish = altsrc.NewIntFlag(&cli.IntFlag{ Name: "min-relay-peers-to-publish", Value: 1, Usage: "Minimum number of peers to publish to Relay", Destination: &options.Relay.MinRelayPeersToPublish, EnvVars: []string{"WAKUNODE2_MIN_RELAY_PEERS_TO_PUBLISH"}, }) ``` - **Type**: `cli.IntFlag` - **Default Value**: 1 - **Destination**: `options.Relay.MinRelayPeersToPublish` (assumed to be of type `int`) - **Analysis**: No issues found. The default value is reasonable. #### Other Flags - **WebsocketPort**, **WebsocketSecurePort**, **RESTPort**, **MetricsServerPort**: All these flags use `cli.IntFlag` with appropriate default values and destinations. No issues found. ### Conclusion The file `cmd/waku/flags.go` does not contain any apparent incorrect integer type conversions. All integer flags are defined with appropriate types, default values, and destinations. No changes are necessary for this file concerning the reported issue. ### Recommendation Proceed to review the other files (`cmd/waku/main.go`, `cmd/waku/node.go`, `cmd/waku/options.go`) as planned to ensure there are no incorrect integer type conversions in those files.

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