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agent
agent.exe
!agent/
proxy
proxy.exe
!proxy/
config.json
*-config.json
.DS_Store
.cursor/
*.txt
__blobstorage__/
__azurite*.json
LICENSE
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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.
Makefile
+18
View File
@@ -0,0 +1,18 @@
.PHONY: all clean proxy agent
ifndef TOKEN
CONN_STRING ?=
else
CONN_STRING = -X 'main.ConnString=$(TOKEN)'
endif
all: clean proxy agent
proxy:
go build -ldflags="-s -w" -trimpath -o proxy cmd/proxy/main.go
agent:
go build -ldflags="-s -w $(CONN_STRING)" -trimpath -o agent cmd/agent/main.go
clean:
rm -f proxy agent
README.md
+383
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@@ -0,0 +1,383 @@
# ProxyBlob
<p align="center">
<img src="docs/logo.png" alt="ProxyBlob logo" width="300"/>
</p>
<p align="center"><i>SOCKS proxy over Azure Storage Blob service</i></p>
## Overview
ProxyBlob is a tool designed to create SOCKS proxy tunnels through Azure Blob Storage service. This is particularly useful in environments where direct network connectivity is restricted but `*.blob.core.windows.net` is accessible.
The system consists of two components:
1. **Proxy Server**: Runs on your local machine and provides a SOCKS interface for your applications
2. **Agent**: Runs inside the target network and communicates with the proxy through Azure Blob Storage
## Features
- SOCKS5 protocol (CONNECT and UDP ASSOCIATE)
- Communication through Azure Blob Storage
- Interactive CLI with auto-completion
- Multiple agent management
- Local proxy server
## Prerequisites
- Go 1.23 or higher
- An Azure Storage Account
### Storage Account
#### Azure
In order to use ProxyBlob, you will need an Azure Subscription to create an Azure Storage Account. Once you have a subscription, you can create a storage account in the Azure Portal or using the Azure CLI.
Here are the steps to create a storage account using the Azure Portal:
1. Go to [https://portal.azure.com](https://portal.azure.com)
2. Login with your Azure account
3. In the top Search bar, type "Storage accounts"
4. Click on "+ Create"
5. Fill in the required fields
6. Click on "Review + create"
7. Click on "Create"
Storage account settings:
- **Subscription**: Select your Azure subscription
- **Resource Group**: Create new Resource Group or select existing
- **Storage account name**: Choose a name for your storage account
- **Location**: Select a location near you
- **Performance**: Premium ⚠️ we will require low latency and high throughput
- **Premium account type**: Block blobs (high transaction rates)
- **Redundancy**: Locally-redundant Storage (LRS)
<p align="center">
<img src="docs/create-storage-account.png" alt="Create Storage Account" width="600"/>
</p>
Once the deployment is complete, you will see the newly created storage account in the list.
<p align="center">
<img src="docs/list-storage-accounts.png" alt="List of Storage accounts" />
</p>
Finally, click on "Security + networking" and then "Access keys" to get the storage account key.
<p align="center">
<img src="docs/access-keys.png" alt="Access Keys" />
</p>
Here are the steps to create a storage account using the Azure CLI:
```bash
# Login to Azure
az login
# Create a resource group
az group create --name "proxyblob-resource-group" --location "Central US"
# Create a storage account
az storage account create --name "myproxyblob" --resource-group "proxyblob-resource-group" --location "Central US" --sku "Premium_LRS" --kind BlockBlobStorage
# Get the storage account key
az storage account keys list --account-name "myproxyblob" --output table
```
You should see displayed the storage account keys.
#### Azurite
If you want to test the tool, you can also use [Azurite] (https://github.com/Azure/Azurite), a lightweight server clone of Azure Storage that can be run locally. To install Azurite, I recommend using either [Visual Studio Code extension](https://marketplace.visualstudio.com/items?itemName=Azurite.azurite) or [Docker](https://hub.docker.com/r/microsoft/azure-storage-azurite).
For the extension, installation is straightforward:
1. Go to the Extensions tab
2. Search for `Azurite.azurite`
3. Click "Install"
You should see down right of your editor 3 buttons like this:
```
[Azurite Table Service] [Azurie Queue Service] [Azurite Blob Service]
```
Press on the `[Azurite Blob Service]` and the service should be running.
For Docker, you will have to pull the image and run it:
```
docker pull mcr.microsoft.com/azure-storage/azurite
docker run -p 10000:10000 mcr.microsoft.com/azure-storage/azurite
```
The default storage account name is `devstoreaccount1` and the account key is `Eby8vdM02xNOcqFlqUwJPLlmEtlCDXJ1OUzFT50uSRZ6IFsuFq2UVErCz4I6tq/K1SZFPTOtr/KBHBeksoGMGw==`.
## Installation
```bash
# Clone the repository
git clone https://github.com/quarkslab/proxyblob
cd proxyblob
# Build both components
make
```
This will produce the following binaries:
- `proxy` - the proxy server running on your machine
- `agent` - the agent running on the target
## Configuration
Create a `config.json` file based on the [example](example_config.json) with your Azure Storage credentials:
```json
{
"storage_url": "http://localhost:10000/", // omit if using Azure
"storage_account_name": "your-storage-account-name",
"storage_account_key": "your-storage-account-key"
}
```
## Usage
### Starting the Proxy Server
```bash
./proxy -c my-config.json # if omitted, config.json is used by default
```
This will start an interactive CLI with the following commands:
```
Commands:
clear clear the screen
create, new create a new agent container and generate its connection string
delete, rm delete an existing agent container
exit exit the shell
help use 'help [command]' for command help
list, ls list all existing agent containers
select, use select an agent for subsequent commands
start, proxy start SOCKS proxy server
stop stop running proxy for the selected agent
```
Once the proxy server is running, you can create a new agent container by using the `create` command.
```
proxyblob » create
16:28:37 INF Agent container created successfully container_id=5f5250e9-5518-4682-90ea-f61abf797654
16:28:37 INF Connection string generated connection_string=aHR0cDovL2xvY2FsaG9zdDoxMDAwMC9kZXZzdG9yZWFjY291bnQxLzVmNTI1MGU5LTU1MTgtNDY4Mi05MGVhLWY2MWFiZjc5NzY1ND9zZT0yMDI1LTA0LTI0VDE0JTNBMjglM0EzN1omc2lnPXpjNUNVYVZKJTJGS1duY3RtbnlNZ0clMkZZNkNrRzZHYXJzMXRFTXkxR0ZiTVVZJTNEJnNwPXJ3JnNwcj1odHRwcyUyQ2h0dHAmc3I9YyZzdD0yMDI1LTA0LTE3VDE0JTNBMjMlM0EzN1omc3Y9MjAyMC0xMC0wMg
```
Use the connection string generated with the agent (see below [Starting the Agent](#starting-the-agent)). If the agent connects successfully, you should see the “Agent Info” column filled in when you list the agents with the `list` command.
```
proxyblob » list
╭──────────────────────────────────────┬────────────┬────────────┬─────────────────────┬─────────────────────╮
│ CONTAINER ID │ AGENT INFO │ PROXY PORT │ FIRST SEEN │ LAST SEEN │
├──────────────────────────────────────┼────────────┼────────────┼─────────────────────┼─────────────────────┤
│ 5f5250e9-5518-4682-90ea-f61abf797654 │ atsika@qb │ │ 2025-04-17 14:28:37 │ 2025-04-17 14:28:37 │
╰──────────────────────────────────────┴────────────┴────────────┴─────────────────────┴─────────────────────╯
```
Select the agent using `select <container id>` and start the proxy listener (by default it listens on localhost:1080) by using the `start` command.
```
atsika@qb » select 5f5250e9-5518-4682-90ea-f61abf797654
17:17:51 INF Agent selected agent=atsika@qb
atsika@qb » start
17:17:58 INF Proxy started successfully agent=atsika@qb port=1080
```
You can now use for example [proxychains](https://github.com/rofl0r/proxychains-ng) to tunnel the traffic through the SOCKS proxy.
```bash
proxychains xfreerdp /v:dc01.domain.local /u:Administrator
```
### Starting the Agent
In order to run, the agent requires a connection string that can be generated using the proxy. You can pass it as an argument or directly embed it at compile-time.
```bash
# Via argument
./agent -c <generated-connection-string>
# Build the agent with embedded connection string
make agent TOKEN=<generated-connection-string>
./agent
```
## Architecture
The communication flow works like this:
1. The agent periodically polls an Azure Blob container for encoded packets in a request blob
2. The proxy writes encoded packets to the Azure Blob container in a request blob
3. When the agent finds a packet, it processes it and writes the response back to a response blob
4. The proxy reads the response and maintains the SOCKS connection with client applications
The global flow is the following:
```mermaid
graph TB
%% Client applications
Client1[Client Application] -->|SOCKS5 Request| SocksServer
Client2[Web Browser] -->|SOCKS5 Request| SocksServer
%% Proxy Server Components
subgraph "Proxy Server (Local Machine)"
SocksServer[SOCKS5 Server]
CLI[Interactive CLI]
ProxyHandler[Proxy Handler]
TransportP[Blob Transport]
end
%% Connection between components
CLI -->|Commands| SocksServer
SocksServer -->|Process Request| ProxyHandler
ProxyHandler -->|Encode Packets| TransportP
TransportP -->|Receive Responses| ProxyHandler
ProxyHandler -->|Return Data| SocksServer
%% Azure Blob Storage
subgraph "Azure Blob Storage"
RequestBlob[Request Blob]
ResponseBlob[Response Blob]
end
%% Connection to Azure
TransportP -->|Write| RequestBlob
ResponseBlob -->|Read| TransportP
%% Agent Components
subgraph "Agent (Target Network)"
AgentPoller[Polling Component]
TransportA[Blob Transport]
SocksHandler[SOCKS Handler]
CommandProcessor[Command Processor]
end
%% Agent connections
RequestBlob -->|Poll| AgentPoller
AgentPoller -->|Process| TransportA
TransportA -->|Decode Packets| SocksHandler
SocksHandler -->|Process Commands| CommandProcessor
%% Command Processing - Fixed syntax
subgraph "Command Processing"
Connect["CONNECT"]
Bind["TODO: BIND"]
UDP["UDP ASSOCIATE"]
end
CommandProcessor -->|Route| Connect
CommandProcessor -->|Route| Bind
CommandProcessor -->|Route| UDP
%% Target Connections
Connect -->|TCP Connection| TargetServer1[Target Server]
UDP -->|UDP Connection| TargetServer2[Target Server]
%% Return path
TargetServer1 -->|Response Data| SocksHandler
TargetServer2 -->|UDP Data| SocksHandler
SocksHandler -->|Encode Response| TransportA
TransportA -->|Write| ResponseBlob
```
An example of a CONNECT operation is the following:
```mermaid
sequenceDiagram
participant Client as Client Application
participant Proxy as Proxy Server
participant AzureStor as Azure Blob Storage
participant Agent as Agent
participant Target as Target Server
Note over Client,Target: SOCKS5 Protocol Flow
%% Proxy Server and Agent Initialization
Proxy->>AzureStor: Initialize connection
Agent->>AzureStor: Start polling for requests
%% Client Connection and Authentication
Client->>Proxy: TCP Connection
Proxy->>Client: Auth methods (NoAuth supported)
Client->>Proxy: Select Auth method
%% Command Processing
Client->>Proxy: CONNECT command + target address
Proxy->>AzureStor: Write CONNECT request packet to Request Blob
Agent->>AzureStor: Poll and retrieve CONNECT request
%% Target Connection
Agent->>Target: Establish TCP connection
Target->>Agent: Connection established
Agent->>AzureStor: Write connection success to Response Blob
Proxy->>AzureStor: Poll and retrieve response
Proxy->>Client: CONNECT success response
%% Data Transfer (Bidirectional)
Client->>Proxy: Send data
Proxy->>AzureStor: Write data packet to Request Blob
Agent->>AzureStor: Poll and retrieve data packet
Agent->>Target: Forward data
Target->>Agent: Response data
Agent->>AzureStor: Write response data to Response Blob
Proxy->>AzureStor: Poll and retrieve response data
Proxy->>Client: Forward response data
```
## Troubleshooting
**Why does my agent immediately stop running ?**
There might be several reasons why your agent stops immediately after you run it. Check its exit code:
```sh
# Bash
echo $?
```
```cmd
REM CMD
echo %ERRORLEVEL%
```
```pwsh
# PowerShell
echo $LastExitCode
```
Each exit code describes why the agent stopped running:
| Exit code | Reason |
| --------- | ------------------------------------------- |
| 0 | No error |
| 1 | The context has been canceled |
| 2 | The connection string is missing |
| 3 | The connection string is invalid or expired |
| 4 | The agent failed to write its metadata |
| 5 | The agent container is not found |
If you encounter issues:
1. Check Azure credentials and permissions
2. Verify connectivity to Azure Blob Storage
3. Check for any firewall rules blocking outbound connections
4. Ensure the agent is running and properly connected
## TODO
- BIND command implementation (currently not working)
- Enhanced error handling and recovery
- Improve proxy speed
## License
[GNU GPLv3 License](LICENSE)
cmd/agent/main.go
+283
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@@ -0,0 +1,283 @@
// Package main implements the SOCKS proxy agent.
package main
import (
"bytes"
"context"
"encoding/base64"
"errors"
"flag"
"fmt"
"net/url"
"os"
"os/signal"
"os/user"
"strings"
"syscall"
"time"
"github.com/Azure/azure-storage-blob-go/azblob"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
"proxyblob/pkg/protocol"
proxy "proxyblob/pkg/proxy/socks"
"proxyblob/pkg/transport"
)
// Exit codes.
const (
Success = 0 // success
ErrContextCanceled = 1 // context canceled
ErrNoConnectionString = 2 // missing connection string
ErrConnectionStringError = 3 // invalid connection string
ErrInfoBlobError = 4 // info blob write failed
ErrContainerNotFound = 5 // container not found
)
// ConnString holds the Azure connection string.
// Can be set at compile time or via command line flag.
var ConnString string
// Blob names for proxy-agent communication.
const (
InfoBlobName = "info" // agent metadata
RequestBlobName = "request" // proxy-to-agent traffic
ResponseBlobName = "response" // agent-to-proxy traffic
)
// InfoKey defines the XOR encryption key for agent information
// Security Note: Changing this key requires synchronized updates on both proxy and agent
var (
InfoKey = []byte{0xDE, 0xAD, 0xB1, 0x0B}
)
// Agent manages proxy operations and blob storage communication.
type Agent struct {
ContainerURL azblob.ContainerURL // Azure container access
Handler *proxy.SocksHandler // SOCKS handler
}
// NewAgent creates an agent from a connection string.
func NewAgent(ctx context.Context, connString string) (*Agent, int) {
storageURL, containerID, sasToken, errCode := ParseConnectionString(connString)
if errCode != Success {
return nil, errCode
}
pipeline := azblob.NewPipeline(
azblob.NewAnonymousCredential(),
azblob.PipelineOptions{},
)
fullURL := fmt.Sprintf("%s/%s?%s", storageURL, containerID, sasToken)
containerURL, err := url.Parse(fullURL)
if err != nil {
return nil, ErrConnectionStringError
}
container := azblob.NewContainerURL(*containerURL, pipeline)
blobTransport := transport.NewBlobTransport(
container.NewBlockBlobURL(RequestBlobName), // read
container.NewBlockBlobURL(ResponseBlobName), // write
)
handler := proxy.NewSocksHandler(ctx, blobTransport)
agent := &Agent{
ContainerURL: container,
Handler: handler,
}
return agent, Success
}
// Start begins processing proxy requests.
func (a *Agent) Start(ctx context.Context) int {
// Push agent information to blob storage
if err := a.WriteInfoBlob(ctx); err != Success {
a.Stop()
return ErrContainerNotFound
}
// Start the container monitoring goroutine
go a.healthCheck(ctx)
// Start the handler
a.Handler.Start("")
// Wait for handler context to be done
<-a.Handler.Ctx.Done()
// Check if context was canceled externally
if errors.Is(ctx.Err(), context.Canceled) {
return ErrContextCanceled
}
return Success
}
// Stop terminates agent operations.
func (a *Agent) Stop() {
a.Handler.Stop()
}
// healthCheck verifies container existence every 30s and stops the agent if it's unavailable.
func (a *Agent) healthCheck(ctx context.Context) {
ticker := time.NewTicker(30 * time.Second)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return
case <-ticker.C:
blobURL := a.ContainerURL.NewBlockBlobURL(InfoBlobName)
_, err := blobURL.GetProperties(ctx, azblob.BlobAccessConditions{}, azblob.ClientProvidedKeyOptions{})
if err != nil {
if storageErr, ok := err.(azblob.StorageError); ok {
if storageErr.ServiceCode() == azblob.ServiceCodeContainerNotFound ||
storageErr.ServiceCode() == azblob.ServiceCodeContainerBeingDeleted {
a.Stop()
return
}
}
}
}
}
}
// WriteInfoBlob updates agent metadata.
func (a *Agent) WriteInfoBlob(ctx context.Context) int {
info := GetCurrentInfo()
encryptedInfo := protocol.Xor([]byte(info), InfoKey)
blobURL := a.ContainerURL.NewBlockBlobURL(InfoBlobName)
_, err := blobURL.Upload(
ctx,
bytes.NewReader(encryptedInfo),
azblob.BlobHTTPHeaders{ContentType: "text/plain"},
azblob.Metadata{},
azblob.BlobAccessConditions{},
azblob.DefaultAccessTier,
nil,
azblob.ClientProvidedKeyOptions{},
azblob.ImmutabilityPolicyOptions{},
)
if err != nil {
// Check for context cancellation first
if errors.Is(ctx.Err(), context.Canceled) {
return ErrContextCanceled
}
// Check for container deletion
if storageErr, ok := err.(azblob.StorageError); ok {
if storageErr.ServiceCode() == azblob.ServiceCodeContainerNotFound ||
storageErr.ServiceCode() == azblob.ServiceCodeContainerBeingDeleted {
return ErrContainerNotFound
}
// Other storage errors
return ErrInfoBlobError
}
return ErrInfoBlobError
}
return Success
}
// ParseConnectionString extracts storage URL, container ID and SAS token from a connection string.
func ParseConnectionString(connString string) (string, string, string, int) {
// Check for empty string first
if connString == "" {
return "", "", "", ErrNoConnectionString
}
// Try to decode the base64 encoded string
decoded, err := base64.RawStdEncoding.DecodeString(connString)
if err != nil {
return "", "", "", ErrConnectionStringError
}
// Parse the URL and extract components
u, err := url.Parse(string(decoded))
if err != nil {
return "", "", "", ErrConnectionStringError
}
// Extract path components and query string
path := strings.TrimPrefix(u.Path, "/")
if path == "" {
return "", "", "", ErrConnectionStringError
}
if u.RawQuery == "" {
return "", "", "", ErrConnectionStringError
}
// Return the storage URL, container ID and SAS token
storageURL := fmt.Sprintf("%s://%s", u.Scheme, u.Host)
return storageURL, path, u.RawQuery, Success
}
// GetCurrentInfo returns username@hostname.
func GetCurrentInfo() string {
hostname, err := os.Hostname()
if err != nil {
hostname = "unknown"
}
currentUser, err := user.Current()
if err != nil {
currentUser = &user.User{
Username: "unknown",
}
}
return fmt.Sprintf("%s@%s", currentUser.Username, hostname)
}
// init configures logging with zerolog
// Sets up console output and INFO level logging
func init() {
// Configure logging
zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
zerolog.SetGlobalLevel(zerolog.InfoLevel)
// Use a more human-friendly output for console
log.Logger = log.Output(zerolog.ConsoleWriter{Out: os.Stderr})
}
// main is the entry point for the agent process
// Handles command-line flags, signal management, and agent lifecycle
func main() {
// Parse command line flags
flag.StringVar(&ConnString, "c", ConnString, "Connection string")
flag.Parse()
if ConnString == "" {
os.Exit(ErrNoConnectionString)
}
// Create context that can be cancelled with CTRL+C
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
// Handle SIGINT (CTRL+C) and SIGTERM
sig := make(chan os.Signal, 1)
signal.Notify(sig, syscall.SIGINT, syscall.SIGTERM)
go func() {
<-sig
cancel()
}()
// Create the agent
agent, err := NewAgent(ctx, ConnString)
if err != Success {
os.Exit(err)
}
// Start the agent
ErrCode := agent.Start(ctx)
os.Exit(ErrCode)
}
cmd/proxy/main.go
+782
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@@ -0,0 +1,782 @@
// Package main implements the SOCKS proxy server.
package main
import (
"context"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"net"
"net/url"
"os"
"path/filepath"
"strings"
"sync"
"time"
"github.com/Azure/azure-storage-blob-go/azblob"
"github.com/desertbit/grumble"
"github.com/google/uuid"
"github.com/jedib0t/go-pretty/table"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
"proxyblob/pkg/protocol"
proxy "proxyblob/pkg/proxy/server"
"proxyblob/pkg/transport"
)
// CLI banner with version.
const banner = `
____ ____ _ _
| _ \ _ __ _____ ___ _| __ )| | ___ | |__
| |_) | '__/ _ \ \/ / | | | _ \| |/ _ \| '_ \
| __/| | | (_) > <| |_| | |_) | | (_) | |_) |
|_| |_| \___/_/\_\\__, |____/|_|\___/|_.__/
|___/
SOCKS Proxy over Azure Blob Storage (v1.0)
------------------------------------------
`
// Blob names for proxy-agent communication.
const (
InfoBlobName = "info" // agent metadata
RequestBlobName = "request" // proxy-to-agent traffic
ResponseBlobName = "response" // agent-to-proxy traffic
)
// InfoKey defines the XOR encryption key for agent information
// Security Note: Changing this key requires synchronized updates on both proxy and agent
var (
InfoKey = []byte{0xDE, 0xAD, 0xB1, 0x0B}
)
// Config holds Azure Storage credentials.
type Config struct {
StorageAccountName string `json:"storage_account_name"` // account ID
StorageAccountKey string `json:"storage_account_key"` // access key
StorageURL string `json:"storage_url,omitempty"` // custom endpoint (for development purposes)
}
// StorageManager handles Azure Storage operations.
type StorageManager struct {
ServiceURL *azblob.ServiceURL // storage endpoint
SharedKeyCredential *azblob.SharedKeyCredential // auth credentials
}
// ContainerInfo tracks proxy agent metadata.
type ContainerInfo struct {
ID string // container ID
AgentInfo string // username@hostname
ProxyPort string // SOCKS port
CreatedAt time.Time // creation time
LastActivity time.Time // last operation
}
// Global state.
var (
config *Config // app config
storageManager *StorageManager // storage access
selectedAgent string // current agent
runningProxies sync.Map // active proxies
)
// LoadConfig reads and parses config file.
func LoadConfig(configPath string) (*Config, error) {
// Use default config path (./config.json) if none provided
if configPath == "" {
configPath = "./config.json"
}
// Get absolute path for clearer error messages
absPath, err := filepath.Abs(configPath)
if err != nil {
return nil, fmt.Errorf("failed to resolve config path: %v", err)
}
// Check if config file exists
if _, err := os.Stat(absPath); os.IsNotExist(err) {
return nil, fmt.Errorf("configuration file not found at %s", absPath)
}
// Read and parse the configuration file
data, err := os.ReadFile(absPath)
if err != nil {
return nil, fmt.Errorf("failed to read config file %s: %v", absPath, err)
}
config := new(Config)
if err := json.Unmarshal(data, config); err != nil {
return nil, fmt.Errorf("failed to parse config file %s: %v", absPath, err)
}
// Validate configuration
if err := config.Validate(); err != nil {
return nil, err
}
return config, nil
}
// Validate checks required config fields.
func (config *Config) Validate() error {
if config.StorageAccountName == "" {
return fmt.Errorf("storage_account_name is required")
}
if config.StorageAccountKey == "" {
return fmt.Errorf("storage_account_key is required")
}
return nil
}
// NewStorageManager creates Azure Storage client.
func NewStorageManager(config *Config) (*StorageManager, error) {
// Create credentials using the storage account name and key
credential, err := azblob.NewSharedKeyCredential(
config.StorageAccountName,
config.StorageAccountKey,
)
if err != nil {
return nil, fmt.Errorf("failed to create storage credentials: %v", err)
}
// Create a pipeline for storage operations
pipeline := azblob.NewPipeline(
credential,
azblob.PipelineOptions{},
)
// Build the service URL for the storage account
var serviceURL *url.URL
if config.StorageURL != "" {
// Use the custom storage URL provided in the config (for Azurite support)
serviceURL, err = url.Parse(config.StorageURL)
if err != nil {
return nil, fmt.Errorf("failed to parse storage URL: %v", err)
}
serviceURL = serviceURL.JoinPath(config.StorageAccountName)
} else {
// Use the default Azure Storage URL format
serviceURL, err = url.Parse(fmt.Sprintf("https://%s.blob.core.windows.net/", config.StorageAccountName))
if err != nil {
return nil, fmt.Errorf("failed to parse service URL: %v", err)
}
}
service := azblob.NewServiceURL(*serviceURL, pipeline)
return &StorageManager{
ServiceURL: &service,
SharedKeyCredential: credential,
}, nil
}
// CreateAgentContainer creates a new container for agent communication.
// Returns the container ID and connection string that should be provided to the agent.
func (sm *StorageManager) CreateAgentContainer(expiry time.Duration) (string, string, error) {
// Generate a unique ID for the container
containerID := uuid.New().String()
containerURL := sm.ServiceURL.NewContainerURL(containerID)
ctx := context.Background()
// Create the container with private access level
_, err := containerURL.Create(ctx, azblob.Metadata{}, azblob.PublicAccessNone)
if err != nil {
return "", "", fmt.Errorf("failed to create container: %v", err)
}
// Initialize the required blobs
blobNames := []string{InfoBlobName, RequestBlobName, ResponseBlobName}
for _, blobName := range blobNames {
blobURL := containerURL.NewBlockBlobURL(blobName)
// Create an empty blob - it will be populated later by the agent or proxy
_, err := blobURL.Upload(
ctx,
strings.NewReader(""), // Empty content initially
azblob.BlobHTTPHeaders{
ContentType: "application/octet-stream",
},
azblob.Metadata{
"created": time.Now().UTC().Format(time.RFC3339),
},
azblob.BlobAccessConditions{},
azblob.DefaultAccessTier,
azblob.BlobTagsMap{}, // No initial tags
azblob.ClientProvidedKeyOptions{}, // No client-provided encryption
azblob.ImmutabilityPolicyOptions{}, // No immutability policy
)
if err != nil {
// If blob creation fails, attempt to clean up the container
if _, delErr := containerURL.Delete(ctx, azblob.ContainerAccessConditions{}); delErr != nil {
return "", "", fmt.Errorf("failed to delete container after blob creation failed: %v", delErr)
}
return "", "", fmt.Errorf("failed to create %s blob: %v", blobName, err)
}
}
// Generate a SAS token for the container
sasToken, err := sm.GenerateSASToken(containerID, expiry)
if err != nil {
// If SAS token generation fails, clean up the container
if _, delErr := containerURL.Delete(ctx, azblob.ContainerAccessConditions{}); delErr != nil {
return "", "", fmt.Errorf("failed to delete container after SAS token generation failed")
}
return "", "", fmt.Errorf("failed to generate SAS token")
}
connectionString, _ := url.Parse(storageManager.ServiceURL.String())
connectionString = connectionString.JoinPath(containerID)
connString := connectionString.String() + "?" + sasToken
return containerID, connString, nil
}
// GenerateSASToken creates a Shared Access Signature token for container access.
// The token provides limited-time read/write access to specific container resources.
func (sm *StorageManager) GenerateSASToken(containerName string, expiry time.Duration) (string, error) {
// Start time is 5 minutes before now to avoid clock skew issues
startTime := time.Now().UTC().Add(-5 * time.Minute)
// Set expiry time (default 7 days)
expiryTime := time.Now().UTC().Add(expiry)
// Define the permissions for the SAS token
permissions := azblob.ContainerSASPermissions{
Read: true,
Write: true,
}
// Generate the SAS signature
sasQueryParams, err := azblob.BlobSASSignatureValues{
Protocol: azblob.SASProtocolHTTPSandHTTP,
StartTime: startTime,
ExpiryTime: expiryTime,
ContainerName: containerName,
Permissions: permissions.String(),
}.NewSASQueryParameters(sm.SharedKeyCredential)
if err != nil {
return "", fmt.Errorf("failed to create SAS query parameters: %v", err)
}
// Convert the SAS query parameters to a string
sasToken := sasQueryParams.Encode()
return sasToken, nil
}
// ListAgentContainers retrieves information about all agent containers.
// It fetches container metadata and agent information, sorted by creation time.
func (sm *StorageManager) ListAgentContainers(ctx context.Context) ([]ContainerInfo, error) {
var containers []ContainerInfo
// List all containers in the storage account
for marker := (azblob.Marker{}); marker.NotDone(); {
// Get a segment of containers (up to 100 at a time)
listResponse, err := sm.ServiceURL.ListContainersSegment(ctx, marker, azblob.ListContainersSegmentOptions{
Prefix: "",
MaxResults: 0,
})
if err != nil {
return nil, fmt.Errorf("failed to list containers: %v", err)
}
// Update marker for next iteration
marker = listResponse.NextMarker
// Process each container
for _, containerItem := range listResponse.ContainerItems {
// Create container URL for accessing blobs
containerURL := sm.ServiceURL.NewContainerURL(containerItem.Name)
// Try to get the info blob
blobURL := containerURL.NewBlockBlobURL(InfoBlobName)
downloadResponse, err := blobURL.Download(ctx, 0, azblob.CountToEnd, azblob.BlobAccessConditions{}, false, azblob.ClientProvidedKeyOptions{})
// Skip containers that don't have our expected structure
if err != nil {
continue
}
// Read the info blob content
bodyReader := downloadResponse.Body(azblob.RetryReaderOptions{MaxRetryRequests: 3})
agentInfo, err := io.ReadAll(bodyReader)
bodyReader.Close()
if err != nil {
log.Warn().Err(err).Str("container", containerItem.Name).Msg("Failed to read info blob")
continue
}
agentInfo = protocol.Xor(agentInfo, InfoKey)
// Get last activity from response blob
responseBlob := containerURL.NewBlockBlobURL(ResponseBlobName)
responseProps, err := responseBlob.GetProperties(ctx, azblob.BlobAccessConditions{}, azblob.ClientProvidedKeyOptions{})
// Get the last modified time, defaulting to container creation time if not available
var lastActivity time.Time
if err != nil {
lastActivity = containerItem.Properties.LastModified
} else {
lastActivity = responseProps.LastModified()
}
// Check if the container has an active proxy
var proxyPort string
if value, running := runningProxies.Load(containerItem.Name); running {
// Try to get the port from the server object
if server, ok := value.(*proxy.ProxyServer); ok && server.Listener != nil {
_, portStr, err := net.SplitHostPort(server.Listener.Addr().String())
if err == nil {
proxyPort = portStr
}
}
}
// Add the container to our list
containers = append(containers, ContainerInfo{
ID: containerItem.Name,
AgentInfo: string(agentInfo),
ProxyPort: proxyPort,
CreatedAt: containerItem.Properties.LastModified,
LastActivity: lastActivity,
})
}
}
return containers, nil
}
// RenderAgentTable formats container information into a human-readable table.
// The table includes container ID, agent info, proxy port, and timing information.
func RenderAgentTable(containers []ContainerInfo) string {
t := table.NewWriter()
t.SetStyle(table.StyleRounded)
// Set up headers
t.AppendHeader(table.Row{
"Container ID",
"Agent info",
"Proxy port",
"First seen",
"Last seen",
})
// Add rows for each container
for _, c := range containers {
// Add the container information as a row
t.AppendRow(table.Row{
c.ID,
c.AgentInfo,
c.ProxyPort,
c.CreatedAt.Format("2006-01-02 15:04:05"),
c.LastActivity.Format("2006-01-02 15:04:05"),
})
}
// Configure column options for better readability
t.SetColumnConfigs([]table.ColumnConfig{
{Number: 1}, // Container ID
{Number: 2}, // Agent Info
{Number: 3}, // Proxy port
{Number: 4}, // Created At
{Number: 5}, // Last Activity
})
return t.Render()
}
// DeleteAgentContainer removes a container and its associated blobs.
// This terminates the connection with the remote agent.
func (sm *StorageManager) DeleteAgentContainer(ctx context.Context, containerID string) error {
// Stop any running proxy for this container
if server, running := runningProxies.Load(containerID); running {
if proxyServer, ok := server.(*proxy.ProxyServer); ok {
proxyServer.Stop()
}
runningProxies.Delete(containerID)
}
// Create URL for the container we want to delete
containerURL := sm.ServiceURL.NewContainerURL(containerID)
// Delete the container and all its contents
_, err := containerURL.Delete(ctx, azblob.ContainerAccessConditions{})
if err != nil {
return fmt.Errorf("failed to delete container")
}
return nil
}
// ValidateAgent checks if an agent container exists and is properly configured.
// Returns error if the container is missing.
func (sm *StorageManager) ValidateAgent(ctx context.Context, containerID string) error {
containerURL := sm.ServiceURL.NewContainerURL(containerID)
blobURL := containerURL.NewBlockBlobURL(InfoBlobName)
// Try to get the info blob to verify this is a valid agent container
_, err := blobURL.GetProperties(ctx, azblob.BlobAccessConditions{}, azblob.ClientProvidedKeyOptions{})
if err != nil {
if serr, ok := err.(azblob.StorageError); ok {
if serr.ServiceCode() == azblob.ServiceCodeContainerNotFound {
return fmt.Errorf("agent container %s does not exist", containerID)
}
}
return fmt.Errorf("invalid agent container %s: %v", containerID, err)
}
return nil
}
// GetSelectedAgentInfo retrieves the metadata for the currently selected agent.
// Returns error if no agent is selected or the agent information is unavailable.
func (sm *StorageManager) GetSelectedAgentInfo(ctx context.Context) (string, error) {
if selectedAgent == "" {
return "", fmt.Errorf("no agent selected. Use 'agent use <container-id>' first")
}
containerURL := sm.ServiceURL.NewContainerURL(selectedAgent)
blobURL := containerURL.NewBlockBlobURL(InfoBlobName)
// Download the info blob
response, err := blobURL.Download(ctx, 0, azblob.CountToEnd, azblob.BlobAccessConditions{}, false, azblob.ClientProvidedKeyOptions{})
if err != nil {
return "", fmt.Errorf("failed to get agent info: %v", err)
}
// Read the agent info
agentInfo, err := io.ReadAll(response.Body(azblob.RetryReaderOptions{MaxRetryRequests: 3}))
if err != nil {
return "", fmt.Errorf("failed to read agent info: %v", err)
}
agentInfo = protocol.Xor(agentInfo, InfoKey)
return string(agentInfo), nil
}
// AddCommands registers all CLI commands with the application.
// This includes commands for agent management, proxy control, and configuration.
func AddCommands(app *grumble.App) {
// Command to create a new agent
app.AddCommand(&grumble.Command{
Name: "create",
Aliases: []string{"new"},
Help: "create a new agent container and generate its connection string",
Flags: func(f *grumble.Flags) {
f.Duration("d", "duration", 7*24*time.Hour, "duration for the SAS token. by default the token will be valid for 7 days")
},
Run: func(c *grumble.Context) error {
expiry := c.Flags.Duration("duration")
containerID, connString, err := storageManager.CreateAgentContainer(expiry)
if err != nil {
log.Error().Err(err).Msg("Failed to create agent container")
return nil
}
log.Info().Str("container_id", containerID).Msg("Agent container created successfully")
log.Info().Str("connection_string", base64.RawStdEncoding.EncodeToString([]byte(connString))).Msg("Connection string generated")
return nil
},
})
// Command to list existing agents
app.AddCommand(&grumble.Command{
Name: "list",
Aliases: []string{"ls"},
Help: "list all existing agent containers",
Run: func(c *grumble.Context) error {
ctx := context.Background()
// Retrieve all containers
containers, err := storageManager.ListAgentContainers(ctx)
if err != nil {
log.Error().Err(err).Msg("Failed to list containers")
return nil
}
// Display message if no containers found
if len(containers) == 0 {
log.Info().Msg("No agent containers found")
return nil
}
// Display the container table
c.App.Println(RenderAgentTable(containers))
return nil
},
})
// Command to delete an agent
app.AddCommand(&grumble.Command{
Name: "delete",
Aliases: []string{"rm"},
Help: "delete an existing agent container",
Args: func(a *grumble.Args) {
a.StringList("containers-id", "ID of the containers to delete")
},
Completer: CompleteAgents,
Run: func(c *grumble.Context) error {
containerIDs := c.Args.StringList("containers-id")
if len(containerIDs) == 0 {
containerIDs = append(containerIDs, selectedAgent)
}
for _, containerID := range containerIDs {
// Ask for confirmation before deletion
log.Info().Str("container_id", containerID).Msg("Are you sure you want to delete container? [y/N]")
var response string
fmt.Scanln(&response)
if strings.ToLower(response) != "y" {
log.Info().Msg("Deletion cancelled")
return nil
}
// Proceed with deletion
ctx := context.Background()
if err := storageManager.DeleteAgentContainer(ctx, containerID); err != nil {
log.Error().Err(err).Str("container_id", containerID).Msg("Failed to delete container")
return nil
}
if selectedAgent == containerID {
selectedAgent = ""
c.App.SetPrompt("proxyblob » ")
}
log.Info().Str("container_id", containerID).Msg("Container deleted successfully")
}
return nil
},
})
// Command to select an agent
app.AddCommand(&grumble.Command{
Name: "select",
Aliases: []string{"use"},
Help: "select an agent for subsequent commands",
Args: func(a *grumble.Args) {
a.String("container-id", "ID of the container to select")
},
Completer: CompleteAgents,
Run: func(c *grumble.Context) error {
ctx := context.Background()
containerID := c.Args.String("container-id")
// Validate the agent exists
if err := storageManager.ValidateAgent(ctx, containerID); err != nil {
log.Error().Err(err).Msg("Failed to validate agent")
return nil
}
// Store the selected agent
selectedAgent = containerID
// Get and display agent info
agentInfo, err := storageManager.GetSelectedAgentInfo(ctx)
if err != nil {
log.Error().Err(err).Msg("Failed to get agent info")
return nil
}
if agentInfo == "" {
agentInfo = "unknown@host"
}
log.Info().Str("agent", agentInfo).Msg("Agent selected")
c.App.SetPrompt(agentInfo + " » ")
return nil
},
})
// Command to start the proxy server over the current selected agent
app.AddCommand(&grumble.Command{
Name: "start",
Aliases: []string{"proxy"},
Help: "start SOCKS proxy server",
Flags: func(f *grumble.Flags) {
f.String("l", "listen", "127.0.0.1:1080", "listen address for SOCKS server")
},
Run: func(c *grumble.Context) error {
if selectedAgent == "" {
log.Warn().Msg("No agent selected. Use 'select <container-id>' first")
return nil
}
if _, exists := runningProxies.Load(selectedAgent); exists {
log.Warn().Msg("Proxy already running for this agent")
return nil
}
// Verify the container still exists before starting a proxy
ctx := context.Background()
// Check if the container exists
if err := storageManager.ValidateAgent(ctx, selectedAgent); err != nil {
log.Error().Err(err).Msg("Cannot start proxy")
return nil
}
containerURL := storageManager.ServiceURL.NewContainerURL(selectedAgent)
transport := transport.NewBlobTransport(
containerURL.NewBlockBlobURL(ResponseBlobName),
containerURL.NewBlockBlobURL(RequestBlobName),
)
server := proxy.NewProxyServer(ctx, transport)
listenAddr := c.Flags.String("listen")
runningProxies.Store(selectedAgent, server)
server.Start(listenAddr)
// Log the port info for user feedback
if server.Listener != nil {
_, portStr, _ := net.SplitHostPort(server.Listener.Addr().String())
// Get agent info for notification
agentInfo, err := storageManager.GetSelectedAgentInfo(context.Background())
if err != nil || agentInfo == "" {
agentInfo = selectedAgent // Fallback to container ID if we can't get agent info
}
log.Info().Str("agent", agentInfo).Str("port", portStr).Msg("Proxy started successfully")
}
return nil
},
})
// Command to stop the proxy server running the current selected agent
app.AddCommand(&grumble.Command{
Name: "stop",
Help: "stop running proxy for the selected agent",
Run: func(c *grumble.Context) error {
if selectedAgent == "" {
log.Warn().Msg("No agent selected. Use 'select <container-id>' first")
return nil
}
// Retrieve and remove the value from the map in one atomic operation
value, exists := runningProxies.LoadAndDelete(selectedAgent)
if !exists {
log.Warn().Msg("No proxy running for this agent")
return nil
}
// Try to stop the proxy gracefully
server, _ := value.(*proxy.ProxyServer)
server.Stop()
// Get agent info for notification
agentInfo, err := storageManager.GetSelectedAgentInfo(context.Background())
if err != nil || agentInfo == "" {
agentInfo = selectedAgent // Fallback to container ID if we can't get agent info
}
log.Info().Str("agent", agentInfo).Msg("Proxy stopped")
return nil
},
})
}
// CompleteAgents provides tab completion for agent IDs.
// Returns a list of available agent container IDs.
func CompleteAgents(_ string, _ []string) []string {
containers, err := storageManager.ListAgentContainers(context.Background())
if err != nil {
return []string{} // Return empty slice on error
}
var completions []string
for _, container := range containers {
completions = append(completions, container.ID)
}
return completions
}
// -----------------------------------------------------------------------------
// Main Application Entry
// -----------------------------------------------------------------------------
// main is the entry point for the application.
// It sets up the CLI, configuration, and command handlers.
func main() {
// Set up logging
configureLogging()
// Configure and create the CLI app
app := setupCLI()
// Add all command handlers
AddCommands(app)
// Run the application and handle any errors
if err := app.Run(); err != nil {
log.Fatal().Msg(err.Error())
}
}
// configureLogging sets up zerolog with appropriate formatting and level.
func configureLogging() {
// Configure zerolog with a pretty console writer for interactive use
log.Logger = log.Output(zerolog.ConsoleWriter{
Out: os.Stdout,
TimeFormat: "15:04:05",
})
// Set reasonable default log level
zerolog.SetGlobalLevel(zerolog.InfoLevel)
}
// setupCLI initializes the command-line interface with basic configuration.
// Returns a configured grumble App instance.
func setupCLI() *grumble.App {
// Determine history file location
var histFile string
home, err := os.UserHomeDir()
if err != nil {
histFile = ".proxyblob" // current working directory
} else {
histFile = filepath.Join(home, ".proxyblob") // home directory
}
// Create and configure the CLI app
app := grumble.New(&grumble.Config{
Name: "proxyblob",
HistoryFile: histFile,
Flags: func(f *grumble.Flags) {
f.String("c", "config", "config.json", "path to configuration file")
},
})
// Set up our ASCII art banner
app.SetPrintASCIILogo(func(a *grumble.App) {
fmt.Print(banner)
})
// Initialize configuration when the app starts
app.OnInit(func(a *grumble.App, flags grumble.FlagMap) error {
// Load configuration from file
var err error
config, err = LoadConfig(flags.String("config"))
if err != nil {
return fmt.Errorf("failed to load configuration: %v", err)
}
// Validate the configuration
if err := config.Validate(); err != nil {
return fmt.Errorf("invalid configuration: %v", err)
}
// Initialize the storage manager
storageManager, err = NewStorageManager(config)
if err != nil {
return fmt.Errorf("failed to initialize storage manager: %v", err)
}
return nil
})
return app
}
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example_config.json
+4
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{
"storage_account_name": "storage-name",
"storage_account_key": "storage-access-key"
}
go.mod
+40
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@@ -0,0 +1,40 @@
module proxyblob
go 1.23.4
require (
github.com/desertbit/grumble v1.1.3
github.com/google/uuid v1.6.0
golang.org/x/crypto v0.33.0
)
require (
github.com/Azure/azure-pipeline-go v0.2.3 // indirect
github.com/Azure/go-autorest/autorest/adal v0.9.24 // indirect
github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 // indirect
github.com/go-openapi/errors v0.22.0 // indirect
github.com/go-openapi/strfmt v0.23.0 // indirect
github.com/golang-jwt/jwt/v4 v4.5.1 // indirect
github.com/mattn/go-ieproxy v0.0.12 // indirect
github.com/mattn/go-runewidth v0.0.16 // indirect
github.com/mitchellh/mapstructure v1.5.0 // indirect
github.com/oklog/ulid v1.3.1 // indirect
github.com/rivo/uniseg v0.4.7 // indirect
go.mongodb.org/mongo-driver v1.17.3 // indirect
golang.org/x/net v0.35.0 // indirect
golang.org/x/text v0.22.0 // indirect
)
require (
github.com/Azure/azure-storage-blob-go v0.15.0
github.com/desertbit/closer/v3 v3.7.5 // indirect
github.com/desertbit/columnize v2.1.0+incompatible // indirect
github.com/desertbit/go-shlex v0.1.1 // indirect
github.com/desertbit/readline v1.5.1 // indirect
github.com/fatih/color v1.18.0 // indirect
github.com/jedib0t/go-pretty v4.3.0+incompatible
github.com/mattn/go-colorable v0.1.14 // indirect
github.com/mattn/go-isatty v0.0.20 // indirect
github.com/rs/zerolog v1.33.0
golang.org/x/sys v0.30.0 // indirect
)
go.sum
+193
View File
@@ -0,0 +1,193 @@
github.com/Azure/azure-pipeline-go v0.2.3 h1:7U9HBg1JFK3jHl5qmo4CTZKFTVgMwdFHMVtCdfBE21U=
github.com/Azure/azure-pipeline-go v0.2.3/go.mod h1:x841ezTBIMG6O3lAcl8ATHnsOPVl2bqk7S3ta6S6u4k=
github.com/Azure/azure-storage-blob-go v0.15.0 h1:rXtgp8tN1p29GvpGgfJetavIG0V7OgcSXPpwp3tx6qk=
github.com/Azure/azure-storage-blob-go v0.15.0/go.mod h1:vbjsVbX0dlxnRc4FFMPsS9BsJWPcne7GB7onqlPvz58=
github.com/Azure/go-autorest v14.2.0+incompatible h1:V5VMDjClD3GiElqLWO7mz2MxNAK/vTfRHdAubSIPRgs=
github.com/Azure/go-autorest v14.2.0+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
github.com/Azure/go-autorest/autorest/adal v0.9.13/go.mod h1:W/MM4U6nLxnIskrw4UwWzlHfGjwUS50aOsc/I3yuU8M=
github.com/Azure/go-autorest/autorest/adal v0.9.24 h1:BHZfgGsGwdkHDyZdtQRQk1WeUdW0m2WPAwuHZwUi5i4=
github.com/Azure/go-autorest/autorest/adal v0.9.24/go.mod h1:7T1+g0PYFmACYW5LlG2fcoPiPlFHjClyRGL7dRlP5c8=
github.com/Azure/go-autorest/autorest/date v0.3.0 h1:7gUk1U5M/CQbp9WoqinNzJar+8KY+LPI6wiWrP/myHw=
github.com/Azure/go-autorest/autorest/date v0.3.0/go.mod h1:BI0uouVdmngYNUzGWeSYnokU+TrmwEsOqdt8Y6sso74=
github.com/Azure/go-autorest/autorest/mocks v0.4.1/go.mod h1:LTp+uSrOhSkaKrUy935gNZuuIPPVsHlr9DSOxSayd+k=
github.com/Azure/go-autorest/logger v0.2.1 h1:IG7i4p/mDa2Ce4TRyAO8IHnVhAVF3RFU+ZtXWSmf4Tg=
github.com/Azure/go-autorest/logger v0.2.1/go.mod h1:T9E3cAhj2VqvPOtCYAvby9aBXkZmbF5NWuPV8+WeEW8=
github.com/Azure/go-autorest/tracing v0.6.0 h1:TYi4+3m5t6K48TGI9AUdb+IzbnSxvnvUMfuitfgcfuo=
github.com/Azure/go-autorest/tracing v0.6.0/go.mod h1:+vhtPC754Xsa23ID7GlGsrdKBpUA79WCAKPPZVC2DeU=
github.com/Netflix/go-expect v0.0.0-20180615182759-c93bf25de8e8/go.mod h1:oX5x61PbNXchhh0oikYAH+4Pcfw5LKv21+Jnpr6r6Pc=
github.com/Netflix/go-expect v0.0.0-20190729225929-0e00d9168667/go.mod h1:oX5x61PbNXchhh0oikYAH+4Pcfw5LKv21+Jnpr6r6Pc=
github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 h1:DklsrG3dyBCFEj5IhUbnKptjxatkF07cF2ak3yi77so=
github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2/go.mod h1:WaHUgvxTVq04UNunO+XhnAqY/wQc+bxr74GqbsZ/Jqw=
github.com/chzyer/logex v1.1.10 h1:Swpa1K6QvQznwJRcfTfQJmTE72DqScAa40E+fbHEXEE=
github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1 h1:q763qf9huN11kDQavWsoZXJNW3xEE4JJyHa5Q25/sd8=
github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/desertbit/closer/v3 v3.1.2/go.mod h1:AAC4KRd8DC40nwvV967J/kDFhujMEiuwIKQfN0IDxXw=
github.com/desertbit/closer/v3 v3.7.5 h1:tJ3BXDeflcWjGSacIQFiFOZf3ep7kit9HMxM87qXVLc=
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github.com/desertbit/columnize v2.1.0+incompatible h1:h55rYmdrWoTj7w9aAnCkxzM3C2Eb8zuFa2W41t0o5j0=
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github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
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github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
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github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
github.com/mattn/go-runewidth v0.0.16 h1:E5ScNMtiwvlvB5paMFdw9p4kSQzbXFikJ5SQO6TULQc=
github.com/mattn/go-runewidth v0.0.16/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
github.com/mgutz/ansi v0.0.0-20170206155736-9520e82c474b/go.mod h1:01TrycV0kFyexm33Z7vhZRXopbI8J3TDReVlkTgMUxE=
github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY=
github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
github.com/nbutton23/zxcvbn-go v0.0.0-20180912185939-ae427f1e4c1d/go.mod h1:o96djdrsSGy3AWPyBgZMAGfxZNfgntdJG+11KU4QvbU=
github.com/oklog/ulid v1.3.1 h1:EGfNDEx6MqHz8B3uNV6QAib1UR2Lm97sHi3ocA6ESJ4=
github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn4U=
github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
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github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
github.com/rs/xid v1.5.0/go.mod h1:trrq9SKmegXys3aeAKXMUTdJsYXVwGY3RLcfgqegfbg=
github.com/rs/zerolog v1.33.0 h1:1cU2KZkvPxNyfgEmhHAz/1A9Bz+llsdYzklWFzgp0r8=
github.com/rs/zerolog v1.33.0/go.mod h1:/7mN4D5sKwJLZQ2b/znpjC3/GQWY/xaDXUM0kKWRHss=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
github.com/stretchr/testify v1.2.1/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
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github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
go.mongodb.org/mongo-driver v1.17.3 h1:TQyXhnsWfWtgAhMtOgtYHMTkZIfBTpMTsMnd9ZBeHxQ=
go.mongodb.org/mongo-driver v1.17.3/go.mod h1:Hy04i7O2kC4RS06ZrhPRqj/u4DTYkFDAAccj+rVKqgQ=
golang.org/x/crypto v0.0.0-20190123085648-057139ce5d2b/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20201002170205-7f63de1d35b0/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
golang.org/x/crypto v0.17.0/go.mod h1:gCAAfMLgwOJRpTjQ2zCCt2OcSfYMTeZVSRtQlPC7Nq4=
golang.org/x/crypto v0.33.0 h1:IOBPskki6Lysi0lo9qQvbxiQ+FvsCC/YWOecCHAixus=
golang.org/x/crypto v0.33.0/go.mod h1:bVdXmD7IV/4GdElGPozy6U7lWdRXA4qyRVGJV57uQ5M=
golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20191112182307-2180aed22343/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
golang.org/x/net v0.0.0-20210610132358-84b48f89b13b/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
golang.org/x/net v0.35.0 h1:T5GQRQb2y08kTAByq9L4/bz8cipCdA8FbRTXewonqY8=
golang.org/x/net v0.35.0/go.mod h1:EglIi67kWsHKlRzzVMUD93VMSWGFOMSZgxFjparz1Qk=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20180606202747-9527bec2660b/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20191112214154-59a1497f0cea/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20201009025420-dfb3f7c4e634/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20201214210602-f9fddec55a1e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.15.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
golang.org/x/term v0.8.0/go.mod h1:xPskH00ivmX89bAKVGSKKtLOWNx2+17Eiy94tnKShWo=
golang.org/x/term v0.15.0/go.mod h1:BDl952bC7+uMoWR75FIrCDx79TPU9oHkTZ9yRbYOrX0=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
golang.org/x/text v0.22.0 h1:bofq7m3/HAFvbF51jz3Q9wLg3jkvSPuiZu/pD1XwgtM=
golang.org/x/text v0.22.0/go.mod h1:YRoo4H8PVmsu+E3Ou7cqLVH8oXWIHVoX0jqUWALQhfY=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
gopkg.in/AlecAivazis/survey.v1 v1.8.5/go.mod h1:iBNOmqKz/NUbZx3bA+4hAGLRC7fSK7tgtVDT4tB22XA=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
pkg/protocol/base.go
+264
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@@ -0,0 +1,264 @@
package protocol
import (
"context"
"sync"
"time"
"proxyblob/pkg/transport"
"github.com/google/uuid"
)
// PacketHandler processes protocol packets and manages connection lifecycle.
// Implementations must be safe for concurrent use by multiple goroutines.
type PacketHandler interface {
// Start begins packet processing and listens on the specified address (listen only on proxy side)
Start(string)
// Stop gracefully terminates all connections and processing
Stop()
// ReceiveLoop processes incoming packets until stopped
ReceiveLoop()
// OnNew handles connection establishment request
OnNew(uuid.UUID, []byte) byte
// OnAck handles connection establishment acknowledgment
OnAck(uuid.UUID, []byte) byte
// OnData handles payload transfer for established connection
OnData(uuid.UUID, []byte) byte
// OnClose handles connection termination request
OnClose(uuid.UUID, byte) byte
}
// BaseHandler implements common protocol functionality for proxy and agent.
// It provides connection management, packet routing, and error handling.
type BaseHandler struct {
// transport handles underlying packet transmission
transport transport.Transport
// Connections maps UUIDs to active Connection objects
Connections sync.Map
// Ctx controls handler lifecycle
Ctx context.Context
// Cancel terminates handler context
Cancel context.CancelFunc
// PacketHandler routes packets to specific handlers
PacketHandler
}
// NewBaseHandler creates a handler with specified context and transport.
// Uses background context if parent context is nil.
func NewBaseHandler(parentCtx context.Context, transport transport.Transport) *BaseHandler {
if parentCtx == nil {
parentCtx = context.Background()
}
ctx, cancel := context.WithCancel(parentCtx)
return &BaseHandler{
transport: transport,
Ctx: ctx,
Cancel: cancel,
}
}
// ReceiveLoop processes incoming packets until context cancellation.
// Implements exponential backoff for consecutive errors.
func (h *BaseHandler) ReceiveLoop() {
consecutiveErrors := 0
maxConsecutiveErrors := 5
for {
select {
case <-h.Ctx.Done():
return
default:
data, errCode := h.transport.Receive(h.Ctx)
if errCode != ErrNone {
if h.transport.IsClosed(errCode) {
h.Stop()
return
}
if h.Ctx.Err() == nil && errCode != ErrTransportError {
consecutiveErrors++
if consecutiveErrors == maxConsecutiveErrors {
return // Too many errors, just exit
}
time.Sleep(time.Duration(consecutiveErrors*50) * time.Millisecond)
}
continue
}
consecutiveErrors = 0
if len(data) == 0 {
continue
}
packet := Decode(data)
if packet == nil {
continue
}
errCode = h.handlePacket(packet)
if errCode != ErrNone {
if h.Ctx.Err() != nil && errCode == ErrConnectionClosed {
continue
}
h.SendClose(packet.ConnectionID, errCode)
}
}
}
}
// handlePacket routes packet to appropriate handler based on command.
// Returns error code indicating success or specific failure.
func (h *BaseHandler) handlePacket(packet *Packet) byte {
switch packet.Command {
case CmdNew:
return h.PacketHandler.OnNew(packet.ConnectionID, packet.Data)
case CmdAck:
return h.PacketHandler.OnAck(packet.ConnectionID, packet.Data)
case CmdData:
return h.PacketHandler.OnData(packet.ConnectionID, packet.Data)
case CmdClose:
return h.PacketHandler.OnClose(packet.ConnectionID, packet.Data[0])
default:
return ErrInvalidCommand
}
}
// SendNewConnection initiates key exchange for new connection.
// Returns error code indicating success or specific failure.
func (h *BaseHandler) SendNewConnection(connectionID uuid.UUID) byte {
privateKey, publicKey := GenerateKeyPair()
nonce := GenerateNonce()
connObj, exists := h.Connections.Load(connectionID)
if !exists {
return ErrConnectionNotFound
}
conn := connObj.(*Connection)
// Store nonce and private key for key derivation during ACK
tempData := make([]byte, len(nonce)+len(privateKey))
copy(tempData[:len(nonce)], nonce)
copy(tempData[len(nonce):], privateKey)
conn.SecretKey = tempData
// Send nonce and public key to peer
data := make([]byte, len(nonce)+len(publicKey))
copy(data[:len(nonce)], nonce)
copy(data[len(nonce):], publicKey)
return h.sendPacket(CmdNew, connectionID, data)
}
// SendConnAck completes key exchange by deriving shared key.
// Returns error code indicating success or specific failure.
func (h *BaseHandler) SendConnAck(connectionID uuid.UUID) byte {
connObj, exists := h.Connections.Load(connectionID)
if !exists {
return ErrConnectionNotFound
}
conn := connObj.(*Connection)
privateKey, publicKey := GenerateKeyPair()
// The first 24 bytes of SecretKey should be the nonce,
// and the server's public key should be in the data field from OnNew
serverData := conn.SecretKey
nonce := serverData[:24]
serverPublicKey := serverData[24:]
symmetricKey, errCode := DeriveKey(privateKey, serverPublicKey, nonce)
if errCode != ErrNone {
return errCode
}
conn.SecretKey = symmetricKey
// Send public key in CmdAck
return h.sendPacket(CmdAck, connectionID, publicKey)
}
func (h *BaseHandler) SendData(connectionID uuid.UUID, data []byte) byte {
// Get connection
connObj, exists := h.Connections.Load(connectionID)
if !exists {
return ErrConnectionNotFound
}
conn := connObj.(*Connection)
encrypted, errCode := Encrypt(conn.SecretKey, data)
if errCode != ErrNone {
return errCode
}
data = encrypted
return h.sendPacket(CmdData, connectionID, data)
}
// SendClose sends a connection termination packet with an error code.
func (h *BaseHandler) SendClose(connectionID uuid.UUID, errCode byte) byte {
connObj, exists := h.Connections.Load(connectionID)
if !exists {
return ErrConnectionNotFound
}
conn := connObj.(*Connection)
conn.Close()
return h.sendPacket(CmdClose, connectionID, []byte{errCode})
}
// sendPacket is the internal method that encodes and sends all packet types.
// It handles error checking and context checking.
func (h *BaseHandler) sendPacket(cmd byte, connectionID uuid.UUID, data []byte) byte {
if h.Ctx.Err() != nil {
return ErrHandlerStopped
}
packet := NewPacket(cmd, connectionID, data)
if packet == nil {
return ErrInvalidPacket
}
encoded := packet.Encode()
if encoded == nil {
return ErrInvalidPacket
}
errCode := h.transport.Send(h.Ctx, encoded)
if errCode != ErrNone {
// Check if this is a transport closure
if h.transport.IsClosed(errCode) {
return ErrTransportClosed
}
return ErrPacketSendFailed
}
return ErrNone
}
func (h *BaseHandler) CloseAllConnections() {
h.Connections.Range(func(key, value interface{}) bool {
conn := value.(*Connection)
// Only notify if not already closed
select {
case <-conn.Closed:
// Already closed
default:
conn.Close()
}
return true
})
}
pkg/protocol/connection.go
+89
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@@ -0,0 +1,89 @@
package protocol
import (
"net"
"time"
"github.com/google/uuid"
)
// ConnectionState tracks the lifecycle of a proxy connection
type ConnectionState int
const (
// StateNew indicates a pending connection awaiting establishment
StateNew ConnectionState = iota
// StateConnected indicates an active connection with data flow
StateConnected
// StateClosed indicates a terminated connection
StateClosed
)
// Connection manages a proxy connection between client and target.
// It is safe for concurrent use by multiple goroutines.
type Connection struct {
// ID uniquely identifies the connection
ID uuid.UUID
// State indicates current connection lifecycle phase
State ConnectionState
// Conn holds the network connection (optional)
Conn net.Conn
// ReadBuffer receives data from the remote endpoint
ReadBuffer chan []byte
// Closed signals connection termination
Closed chan struct{}
// CreatedAt records connection creation time
CreatedAt time.Time
// LastActivity tracks most recent data transfer
LastActivity time.Time
// SecretKey holds encryption key for secure communication
SecretKey []byte
}
// NewConnection creates a connection with specified ID.
// Initializes channels and sets initial timestamps.
func NewConnection(id uuid.UUID) *Connection {
return &Connection{
ID: id,
State: StateNew,
ReadBuffer: make(chan []byte),
Closed: make(chan struct{}),
CreatedAt: time.Now(),
LastActivity: time.Now(),
}
}
// Close terminates the connection and its resources.
// Safe to call multiple times. Returns ErrNone on success.
func (c *Connection) Close() byte {
if c.State == StateClosed {
return ErrNone
}
c.State = StateClosed
select {
case <-c.Closed:
// Already closed
default:
close(c.Closed)
}
if c.Conn != nil {
err := c.Conn.Close()
if err != nil {
return ErrConnectionClosed
}
}
return ErrNone
}
pkg/protocol/crypto.go
+98
View File
@@ -0,0 +1,98 @@
package protocol
import (
"crypto/rand"
"io"
"golang.org/x/crypto/chacha20poly1305"
"golang.org/x/crypto/curve25519"
"golang.org/x/crypto/hkdf"
"golang.org/x/crypto/sha3"
)
// GenerateKeyPair creates a new X25519 key pair for key exchange.
// Returns a properly clamped private key and its corresponding public key.
func GenerateKeyPair() (privateKey, publicKey []byte) {
privateKey = make([]byte, curve25519.ScalarSize)
io.ReadFull(rand.Reader, privateKey)
// Clamp private key according to X25519 spec
privateKey[0] &= 248
privateKey[31] &= 127
privateKey[31] |= 64
publicKey, _ = curve25519.X25519(privateKey, curve25519.Basepoint)
return privateKey, publicKey
}
// GenerateNonce creates a random nonce for ChaCha20-Poly1305.
// Returns a cryptographically secure random nonce.
func GenerateNonce() []byte {
nonce := make([]byte, chacha20poly1305.NonceSizeX)
io.ReadFull(rand.Reader, nonce)
return nonce
}
// DeriveKey performs X25519 key exchange and HKDF key derivation.
// Returns a symmetric key and status code. Key is nil on error.
func DeriveKey(privateKey, peerPublicKey, nonce []byte) ([]byte, byte) {
// Derive shared secret using X25519
sharedSecret, err := curve25519.X25519(privateKey, peerPublicKey)
if err != nil {
return nil, ErrInvalidCrypto
}
// Derive symmetric key using HKDF-SHA3
kdf := hkdf.New(sha3.New256, sharedSecret, nonce, nil)
symmetricKey := make([]byte, chacha20poly1305.KeySize)
if _, err := io.ReadFull(kdf, symmetricKey); err != nil {
return nil, ErrInvalidCrypto
}
return symmetricKey, ErrNone
}
// Encrypt performs authenticated encryption using ChaCha20-Poly1305.
// Returns (nonce || ciphertext || tag) or nil on error.
func Encrypt(key, plaintext []byte) ([]byte, byte) {
aead, err := chacha20poly1305.NewX(key)
if err != nil {
return nil, ErrInvalidCrypto
}
nonce := GenerateNonce()
ciphertext := aead.Seal(nonce, nonce, plaintext, nil)
return ciphertext, ErrNone
}
// Decrypt performs authenticated decryption using ChaCha20-Poly1305.
// Returns decrypted plaintext or nil if authentication fails.
func Decrypt(key, ciphertext []byte) ([]byte, byte) {
aead, err := chacha20poly1305.NewX(key)
if err != nil {
return nil, ErrInvalidCrypto
}
if len(ciphertext) < chacha20poly1305.NonceSizeX {
return nil, ErrInvalidCrypto
}
nonce := ciphertext[:chacha20poly1305.NonceSizeX]
ciphertextBody := ciphertext[chacha20poly1305.NonceSizeX:]
plaintext, err := aead.Open(nil, nonce, ciphertextBody, nil)
if err != nil {
return nil, ErrInvalidCrypto
}
return plaintext, ErrNone
}
// Xor performs byte-wise XOR of data with a repeating key.
// Warning: This is NOT cryptographically secure, use only for basic obfuscation.
func Xor(data []byte, key []byte) []byte {
for i := range data {
data[i] ^= key[i%len(key)]
}
return data
}
pkg/protocol/errors.go
+44
View File
@@ -0,0 +1,44 @@
// Package protocol defines the communication protocol between proxy and agent.
package protocol
import (
"proxyblob/pkg/transport"
)
// Protocol error codes for agent-server communication.
// Uses byte values to minimize binary size and network traffic.
const (
// General errors (0-9)
ErrNone byte = 0 // Operation completed successfully
ErrInvalidCommand byte = 1 // Command type is not recognized
ErrContextCanceled byte = 2 // Context canceled
// Connection errors (10-19)
ErrConnectionClosed byte = 10 // Connection was terminated
ErrConnectionNotFound byte = 11 // Connection ID does not exist
ErrConnectionExists byte = 12 // Connection ID already in use
ErrInvalidState byte = 13 // Connection in wrong state for operation
ErrPacketSendFailed byte = 14 // Packet transmission failed
ErrHandlerStopped byte = 15 // Protocol handler is not running
ErrUnexpectedPacket byte = 16 // Received unexpected packet type
// Transport errors (20-29)
ErrTransportClosed byte = transport.ErrTransportClosed // Transport layer terminated
ErrTransportTimeout byte = transport.ErrTransportTimeout // Transport operation timed out
ErrTransportError byte = transport.ErrTransportError // Transport operation failed
// SOCKS errors (30-39)
ErrInvalidSocksVersion byte = 30 // Unsupported SOCKS protocol version
ErrUnsupportedCommand byte = 31 // SOCKS command not implemented
ErrHostUnreachable byte = 32 // Target host not accessible
ErrConnectionRefused byte = 33 // Target refused connection
ErrNetworkUnreachable byte = 34 // Network path not accessible
ErrAddressNotSupported byte = 35 // Address format not supported
ErrTTLExpired byte = 36 // Time-to-live exceeded
ErrGeneralSocksFailure byte = 37 // Unspecified SOCKS failure
ErrAuthFailed byte = 38 // Authentication rejected
// Packet errors (40-49)
ErrInvalidPacket byte = 40 // Malformed packet structure
ErrInvalidCrypto byte = 41 // Cryptographic operation failed
)
pkg/protocol/protocol.go
+108
View File
@@ -0,0 +1,108 @@
// Package protocol implements the communication protocol between proxy server and agent.
// It provides packet encoding/decoding, connection management, and secure data transfer
// using ChaCha20-Poly1305.
//
// The protocol uses a binary packet format with fixed-size headers and variable-length
// payloads. Each packet contains a command type, connection ID, and optional data.
package protocol
import (
"bytes"
"encoding/binary"
"github.com/google/uuid"
)
// Command types for protocol operations.
const (
CmdNew byte = iota + 1 // Request new connection
CmdAck // Acknowledge connection
CmdData // Transfer data
CmdClose // Terminate connection
)
// Protocol packet field sizes in bytes.
const (
CommandSize = 1 // Command field
UUIDSize = 16 // Connection ID field
DataLengthSize = 4 // Payload length field
HeaderSize = CommandSize + UUIDSize + DataLengthSize
)
// Packet represents a protocol message with the following binary format:
//
// +---------+----------------+--------------+---------+
// | Command | Connection ID | Data Length | Payload |
// +---------+----------------+--------------+---------+
// | 1B | 16B | 4B | var |
type Packet struct {
Command byte // Operation type (CmdNew, CmdAck, etc.)
ConnectionID uuid.UUID // Unique connection identifier
Data []byte // Optional payload data
}
// NewPacket creates a protocol packet with the given parameters.
// The data parameter is optional and may be nil.
func NewPacket(command byte, connectionID uuid.UUID, data []byte) *Packet {
return &Packet{
Command: command,
ConnectionID: connectionID,
Data: data,
}
}
// Encode serializes the packet into a byte slice following the protocol format.
// Returns nil if any encoding operation fails.
func (p *Packet) Encode() []byte {
buf := bytes.NewBuffer(make([]byte, 0, HeaderSize+len(p.Data)))
if err := buf.WriteByte(p.Command); err != nil {
return nil
}
if _, err := buf.Write(p.ConnectionID[:]); err != nil {
return nil
}
if err := binary.Write(buf, binary.BigEndian, uint32(len(p.Data))); err != nil {
return nil
}
if len(p.Data) > 0 {
if _, err := buf.Write(p.Data); err != nil {
return nil
}
}
return buf.Bytes()
}
// Decode deserializes a byte slice into a protocol packet.
// Returns nil if the data is malformed, incomplete, or contains an invalid command.
// The input must contain at least HeaderSize bytes and match the encoded length.
func Decode(data []byte) *Packet {
if len(data) < HeaderSize {
return nil
}
command := data[0]
if command < CmdNew || command > CmdClose {
return nil
}
var id uuid.UUID
copy(id[:], data[CommandSize:CommandSize+UUIDSize])
dataLength := binary.BigEndian.Uint32(data[CommandSize+UUIDSize : HeaderSize])
if uint32(len(data)) != uint32(HeaderSize)+dataLength {
return nil
}
var packetData []byte
if dataLength > 0 {
packetData = make([]byte, dataLength)
copy(packetData, data[HeaderSize:])
}
return NewPacket(command, id, packetData)
}
pkg/proxy/server/errors.go
+44
View File
@@ -0,0 +1,44 @@
// Package proxy implements a SOCKS proxy server.
package proxy
import (
"proxyblob/pkg/protocol"
)
// ErrToString maps protocol error codes to human-readable messages.
// These messages are only used on the server side for logging and debugging.
var ErrToString = map[byte]string{
// General errors
protocol.ErrNone: "no error",
protocol.ErrInvalidCommand: "invalid command",
protocol.ErrContextCanceled: "context canceled",
// Connection state errors
protocol.ErrConnectionClosed: "connection closed",
protocol.ErrConnectionNotFound: "connection not found",
protocol.ErrConnectionExists: "connection already exists",
protocol.ErrInvalidState: "invalid connection state",
protocol.ErrPacketSendFailed: "failed to send packet",
protocol.ErrHandlerStopped: "handler stopped",
protocol.ErrUnexpectedPacket: "unexpected packet received",
// Transport layer errors
protocol.ErrTransportClosed: "transport closed",
protocol.ErrTransportTimeout: "transport timeout",
protocol.ErrTransportError: "general transport error",
// SOCKS reply codes
protocol.ErrInvalidSocksVersion: "invalid SOCKS version",
protocol.ErrUnsupportedCommand: "unsupported command",
protocol.ErrHostUnreachable: "host unreachable",
protocol.ErrConnectionRefused: "connection refused",
protocol.ErrNetworkUnreachable: "network unreachable",
protocol.ErrAddressNotSupported: "address type not supported",
protocol.ErrTTLExpired: "TTL expired",
protocol.ErrGeneralSocksFailure: "general SOCKS server failure",
protocol.ErrAuthFailed: "authentication failed",
// Protocol packet errors
protocol.ErrInvalidPacket: "invalid protocol packet structure",
protocol.ErrInvalidCrypto: "invalid cryptographic operation",
}
pkg/proxy/server/server.go
+302
View File
@@ -0,0 +1,302 @@
// Package proxy implements a SOCKS proxy server.
// It accepts client connections and forwards traffic through transport channels
// to remote agents. The server manages connection lifecycle, encryption, and
// bidirectional data transfer.
package proxy
import (
"context"
"errors"
"io"
"net"
"proxyblob/pkg/protocol"
"proxyblob/pkg/transport"
"time"
"github.com/google/uuid"
"github.com/rs/zerolog/log"
)
// ProxyServer implements a SOCKS proxy server that forwards traffic transparently.
// It accepts client connections and manages the protocol flow between clients and
// remote agents.
type ProxyServer struct {
// BaseHandler provides common protocol functionality
*protocol.BaseHandler
// Listener accepts incoming TCP connections
Listener net.Listener
}
// NewProxyServer creates a proxy server instance with the given transport.
// The transport is used for communication with remote agents.
func NewProxyServer(ctx context.Context, transport transport.Transport) *ProxyServer {
server := &ProxyServer{}
server.BaseHandler = protocol.NewBaseHandler(ctx, transport)
server.PacketHandler = server
return server
}
// Start begins listening for client connections on the specified address.
// It launches background goroutines for accepting connections and processing
// protocol messages. If listening fails, the server is stopped.
func (s *ProxyServer) Start(address string) {
var err error
s.Listener, err = net.Listen("tcp", address)
if err != nil {
log.Error().Err(err).Str("addr", address).Msg("Failed to listen on address")
s.Stop()
return
}
go s.ReceiveLoop()
go s.acceptLoop()
}
// Stop gracefully terminates the proxy server by closing all active
// connections, canceling the handler's context, and stopping the listener.
func (s *ProxyServer) Stop() {
s.CloseAllConnections()
s.Cancel()
if s.Listener != nil {
s.Listener.Close()
}
}
// OnNew handles new connection requests. The server is the only one initiating
// connections, so this always returns ErrUnexpectedPacket.
func (s *ProxyServer) OnNew(connectionID uuid.UUID, data []byte) byte {
return protocol.ErrUnexpectedPacket
}
// OnAck processes connection acknowledgments from agents. It derives a shared
// encryption key using the agent's public key and updates the connection state.
// Returns an error code indicating success or failure.
func (s *ProxyServer) OnAck(connectionID uuid.UUID, data []byte) byte {
value, ok := s.Connections.Load(connectionID)
if !ok {
return protocol.ErrConnectionNotFound
}
conn := value.(*protocol.Connection)
if conn.State != protocol.StateNew {
return protocol.ErrInvalidState
}
clientPublicKey := data[:32]
// At this point,conn.SecretKey contains [24B nonce][32B server private key]
nonce := conn.SecretKey[:24]
serverPrivateKey := conn.SecretKey[24:]
// Derive the shared key
symmetricKey, errCode := protocol.DeriveKey(serverPrivateKey, clientPublicKey, nonce)
if errCode != protocol.ErrNone {
return errCode
}
// Store the symmetric key
conn.SecretKey = symmetricKey
// Signal connection acknowledgment (non-blocking)
conn.ReadBuffer <- []byte{}
conn.State = protocol.StateConnected
conn.LastActivity = time.Now()
return protocol.ErrNone
}
// OnData processes data received from agents. It decrypts the data and forwards
// it to the client. Returns an error code indicating success or failure.
func (s *ProxyServer) OnData(connectionID uuid.UUID, data []byte) byte {
value, ok := s.Connections.Load(connectionID)
if !ok {
return protocol.ErrConnectionNotFound
}
conn := value.(*protocol.Connection)
conn.LastActivity = time.Now()
decrypted, errCode := protocol.Decrypt(conn.SecretKey, data)
if errCode != protocol.ErrNone {
return errCode
}
data = decrypted
// Writing to client is handled by forwardToClient goroutine
select {
case <-s.Ctx.Done():
return protocol.ErrConnectionClosed
case conn.ReadBuffer <- data:
return protocol.ErrNone
}
}
// OnClose handles connection termination from agents. It cleans up the
// connection state.
func (s *ProxyServer) OnClose(connectionID uuid.UUID, errorCode byte) byte {
value, ok := s.Connections.Load(connectionID)
if !ok {
return protocol.ErrNone // Connection already removed, nothing to do
}
conn := value.(*protocol.Connection)
conn.Close()
s.Connections.Delete(connectionID)
return errorCode
}
// acceptLoop accepts incoming TCP connections and spawns goroutines to handle
// each one. It continues until the context is canceled or a non-temporary
// error occurs.
func (s *ProxyServer) acceptLoop() {
for {
select {
case <-s.Ctx.Done():
return
default:
conn, err := s.Listener.Accept()
if err != nil {
if s.Ctx.Err() != nil {
return // Exit quietly on shutdown
}
if _, ok := err.(net.Error); ok {
continue // Retry on temporary network errors
}
return
}
go s.handleConnection(conn)
}
}
}
// handleConnection processes a new client connection by:
// - Generating a unique connection ID
// - Initiating connection with remote agent
// - Setting up bidirectional data forwarding
// - Managing connection lifecycle and cleanup
func (s *ProxyServer) handleConnection(clientConn net.Conn) {
defer clientConn.Close()
connID := uuid.New()
proxyConn := protocol.NewConnection(connID)
s.Connections.Store(proxyConn.ID, proxyConn)
// 1. Initiate connection with the agent
errCode := s.SendNewConnection(connID)
if errCode != protocol.ErrNone {
s.Connections.Delete(connID)
return
}
// 2. Wait for agent acknowledgment with timeout
select {
case <-s.Ctx.Done():
s.SendClose(connID, protocol.ErrHandlerStopped)
s.Connections.Delete(connID)
return
case <-time.After(5 * time.Second):
s.SendClose(connID, protocol.ErrTransportTimeout)
s.Connections.Delete(connID)
return
case <-proxyConn.ReadBuffer:
// Agent acknowledged connection
}
// 3. Connection established, start bidirectional forwarding
proxyConn.State = protocol.StateConnected
proxyConn.LastActivity = time.Now()
errCh := make(chan byte, 2)
go s.forwardToAgent(clientConn, proxyConn, errCh)
go s.forwardToClient(clientConn, proxyConn, errCh)
// Wait for error, closed connection, or context cancellation
select {
case <-s.Ctx.Done():
// Context cancelled, closing connection
case <-proxyConn.Closed:
// Connection closed by agent
case errCode := <-errCh:
if errCode != protocol.ErrNone && errCode != protocol.ErrConnectionClosed {
log.Error().Str("msg", ErrToString[errCode]).Msg("Connection error")
}
}
// Clean up the connection
s.SendClose(connID, protocol.ErrConnectionClosed)
proxyConn.Close()
s.Connections.Delete(connID)
}
// forwardToAgent reads data from the client connection and forwards it to
// the remote agent. It continues until an error occurs or the connection
// is closed.
func (s *ProxyServer) forwardToAgent(clientConn net.Conn, proxyConn *protocol.Connection, errCh chan<- byte) {
buffer := make([]byte, 64*1024)
for {
// Check early termination conditions
if proxyConn.State == protocol.StateClosed {
return
}
select {
case <-s.Ctx.Done():
return
case <-proxyConn.Closed:
return
default:
// Continue processing
}
n, err := clientConn.Read(buffer)
if err != nil {
if errors.Is(err, io.EOF) {
errCh <- protocol.ErrConnectionClosed
} else if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
errCh <- protocol.ErrTransportTimeout
} else {
// General network error
errCh <- protocol.ErrNetworkUnreachable
}
return
}
errCode := s.SendData(proxyConn.ID, buffer[:n])
if errCode != protocol.ErrNone {
errCh <- protocol.ErrPacketSendFailed
return
}
proxyConn.LastActivity = time.Now()
}
}
// forwardToClient reads data from the connection's read buffer and forwards
// it to the client. It continues until an error occurs or the connection
// is closed.
func (s *ProxyServer) forwardToClient(clientConn net.Conn, proxyConn *protocol.Connection, errCh chan<- byte) {
for {
select {
case <-s.Ctx.Done():
return
case <-proxyConn.Closed:
return
case data := <-proxyConn.ReadBuffer:
proxyConn.LastActivity = time.Now()
_, err := clientConn.Write(data)
if err != nil {
if errors.Is(err, io.EOF) {
errCh <- protocol.ErrConnectionClosed
} else if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
errCh <- protocol.ErrTransportTimeout
} else {
// General network error
errCh <- protocol.ErrNetworkUnreachable
}
return
}
}
}
}
pkg/proxy/socks/address.go
+97
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@@ -0,0 +1,97 @@
// Package proxy implements SOCKS5 proxy functionality.
package proxy
import (
"encoding/binary"
"fmt"
"net"
"proxyblob/pkg/protocol"
)
// ParseAddress extracts a target address from SOCKS5 address data.
// It returns the address in host:port format and any error encountered.
// The address format follows RFC 1928 Section 4.
func ParseAddress(data []byte) (string, byte) {
addr, _, err := ParseNetworkAddress(data[0], data[1:])
if err != protocol.ErrNone {
return "", err
}
return addr, protocol.ErrNone
}
// ParseNetworkAddress parses a network address from SOCKS5 formatted data.
// The format is:
//
// +------+----------+----------+
// | ATYP | DST.ADDR | DST.PORT |
// +------+----------+----------+
// | 1 | Variable | 2 |
//
// Returns the address string in host:port format, bytes consumed, and any error.
func ParseNetworkAddress(addrType byte, data []byte) (string, int, byte) {
cursor := 0
var addr string
switch addrType {
case IPv4:
if len(data) < cursor+4+2 { // 4 bytes IPv4 + 2 bytes port
return "", 0, protocol.ErrAddressNotSupported
}
ip := net.IPv4(data[cursor], data[cursor+1], data[cursor+2], data[cursor+3])
addr = ip.String()
cursor += 4
case IPv6:
if len(data) < cursor+16+2 { // 16 bytes IPv6 + 2 bytes port
return "", 0, protocol.ErrAddressNotSupported
}
ip := net.IP(data[cursor : cursor+16])
addr = fmt.Sprintf("[%s]", ip.String())
cursor += 16
case Domain:
if len(data) < cursor+1 { // Need length byte
return "", 0, protocol.ErrAddressNotSupported
}
domainLen := int(data[cursor])
cursor++
if len(data) < cursor+domainLen+2 { // +2 for port
return "", 0, protocol.ErrAddressNotSupported
}
addr = string(data[cursor : cursor+domainLen])
cursor += domainLen
default:
return "", 0, protocol.ErrAddressNotSupported
}
if len(data) < cursor+2 {
return "", 0, protocol.ErrAddressNotSupported
}
port := binary.BigEndian.Uint16(data[cursor : cursor+2])
cursor += 2
return fmt.Sprintf("%s:%d", addr, port), cursor, protocol.ErrNone
}
// ExtractUDPHeader parses a SOCKS5 UDP datagram header and returns the target address.
// The format is:
//
// +-----+------+------+----------+----------+----------+
// | RSV | FRAG | ATYP | DST.ADDR | DST.PORT | DATA |
// +-----+------+------+----------+----------+----------+
// | 2 | 1 | 1 | Variable | 2 | Variable |
//
// Returns the target address, header length, and any error encountered.
func ExtractUDPHeader(data []byte) (string, int, byte) {
headerLen := 4 // RSV(2) + FRAG(1) + ATYP(1)
// Parse the address part of the header
addr, addrLen, err := ParseNetworkAddress(data[3], data[4:]) // Use ATYP and pass remaining data
if err != protocol.ErrNone {
return "", 0, err
}
return addr, headerLen + addrLen, protocol.ErrNone
}
pkg/proxy/socks/bind.go
+15
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@@ -0,0 +1,15 @@
package proxy
import (
"proxyblob/pkg/protocol"
)
// handleBind processes the SOCKS5 BIND command.
// The BIND command is used to accept incoming TCP connections
// on behalf of the client. This implementation returns
// ErrUnsupportedCommand as BIND is not currently supported.
//
// The command format follows RFC 1928 Section 4.
func (h *SocksHandler) handleBind(conn *protocol.Connection, data []byte) byte {
return protocol.ErrUnsupportedCommand
}
pkg/proxy/socks/connect.go
+172
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@@ -0,0 +1,172 @@
package proxy
import (
"encoding/binary"
"io"
"net"
"time"
"proxyblob/pkg/protocol"
)
// handleConnect processes the SOCKS5 CONNECT command.
// It establishes a TCP connection to the requested target and
// sets up bidirectional data transfer between client and target.
//
// The CONNECT command format is:
//
// +-----+-----+-----+------+----------+----------+
// | VER | CMD | RSV | ATYP | DST.ADDR | DST.PORT |
// +-----+-----+-----+------+----------+----------+
// | 1 | 1 | 1 | 1 | Variable | 2 |
//
// Returns an error code indicating success or specific failure reason.
func (h *SocksHandler) handleConnect(conn *protocol.Connection, cmdData []byte) byte {
if len(cmdData) < 4 {
// Send malformed request response
response := []byte{Version5, GeneralFailure, 0x00, IPv4, 0, 0, 0, 0, 0, 0}
h.SendData(conn.ID, response)
return protocol.ErrAddressNotSupported
}
// Parse target address
target, errCode := ParseAddress(cmdData[3:])
if errCode != protocol.ErrNone {
h.SendError(conn, errCode)
return errCode
}
// Establish TCP connection to target
targetConn, err := net.DialTimeout("tcp", target, 10*time.Second)
if err != nil {
// Map network error to appropriate SOCKS5 error code
if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
errCode = protocol.ErrTTLExpired
} else if opErr, ok := err.(*net.OpError); ok {
if opErr.Op == "dial" {
errCode = protocol.ErrNetworkUnreachable
} else if opErr.Op == "read" {
errCode = protocol.ErrHostUnreachable
}
} else if _, ok := err.(*net.DNSError); ok {
errCode = protocol.ErrHostUnreachable
} else {
errCode = protocol.ErrConnectionRefused
}
// Send failure response with appropriate code
h.SendError(conn, errCode)
return errCode
}
// Send success response
localAddr := targetConn.LocalAddr().(*net.TCPAddr)
response := make([]byte, 10)
response[0] = Version5
response[1] = Succeeded
response[2] = 0x00
response[3] = IPv4
copy(response[4:8], localAddr.IP.To4())
binary.BigEndian.PutUint16(response[8:], uint16(localAddr.Port))
errCode = h.SendData(conn.ID, response)
if errCode != protocol.ErrNone {
targetConn.Close()
return protocol.ErrPacketSendFailed
}
// Store connection and set state
conn.Conn = targetConn
conn.State = protocol.StateConnected
// Start data transfer
return h.handleTCPDataTransfer(conn, targetConn)
}
// handleTCPDataTransfer manages bidirectional data transfer for TCP connections.
// It spawns two goroutines:
// - One reads from client and writes to target
// - One reads from target and writes to client
//
// The transfer continues until either:
// - The connection is closed by either end
// - The context is canceled
// - An error occurs
func (h *SocksHandler) handleTCPDataTransfer(conn *protocol.Connection, tcpConn net.Conn) byte {
// Create channels for communication
clientToTarget := make(chan []byte)
targetToClient := make(chan []byte)
errorCh := make(chan byte, 2)
// Read from SOCKS client and forward to target
go func() {
for {
select {
case <-conn.Closed:
return
case <-h.Ctx.Done():
return
case data, ok := <-conn.ReadBuffer:
if !ok {
return
}
clientToTarget <- data
}
}
}()
// Read from target and forward to SOCKS client
go func() {
buffer := make([]byte, 128*1024)
for {
n, err := tcpConn.Read(buffer)
if err != nil {
if err == io.EOF {
errorCh <- protocol.ErrConnectionClosed
} else if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
errorCh <- protocol.ErrTTLExpired
} else {
errorCh <- protocol.ErrHostUnreachable
}
return
}
// Copy data since buffer will be reused
data := make([]byte, n)
copy(data, buffer[:n])
targetToClient <- data
}
}()
// Main data transfer loop
for {
select {
case <-conn.Closed:
tcpConn.Close()
return protocol.ErrNone
case <-h.Ctx.Done():
tcpConn.Close()
return protocol.ErrHandlerStopped
case errCode := <-errorCh:
tcpConn.Close()
return errCode
case data := <-clientToTarget:
_, err := tcpConn.Write(data)
if err != nil {
tcpConn.Close()
if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
return protocol.ErrTTLExpired
}
return protocol.ErrHostUnreachable
}
case data := <-targetToClient:
errCode := h.SendData(conn.ID, data)
if errCode != protocol.ErrNone {
tcpConn.Close()
return protocol.ErrPacketSendFailed
}
}
}
}
pkg/proxy/socks/constants.go
+48
View File
@@ -0,0 +1,48 @@
// Package proxy implements SOCKS5 proxy functionality.
package proxy
// SOCKS protocol versions.
const (
Version5 byte = 0x05 // SOCKS Protocol Version 5
)
// Authentication methods as defined in RFC 1928.
const (
NoAuth byte = 0x00 // No authentication required
GSSAPI byte = 0x01 // GSSAPI
UsernamePassword byte = 0x02 // Username/Password (RFC 1929)
NoAcceptableMethods byte = 0xFF // No acceptable methods
)
// SOCKS5 commands that clients may request.
const (
Connect byte = 0x01 // Establish TCP/IP stream connection
Bind byte = 0x02 // Listen for incoming TCP connection
UDPAssociate byte = 0x03 // Set up UDP relay
)
// Address types for target addresses.
const (
IPv4 byte = 0x01 // IPv4 address (4 bytes)
Domain byte = 0x03 // Domain name (variable length)
IPv6 byte = 0x04 // IPv6 address (16 bytes)
)
// Reply codes sent from server to client.
const (
Succeeded byte = 0x00 // Request granted
GeneralFailure byte = 0x01 // General failure
ConnectionNotAllowed byte = 0x02 // Connection not allowed by ruleset
NetworkUnreachable byte = 0x03 // Network unreachable
HostUnreachable byte = 0x04 // Host unreachable
ConnectionRefused byte = 0x05 // Connection refused by destination
TTLExpired byte = 0x06 // TTL expired
CommandNotSupported byte = 0x07 // Command not supported
AddressTypeNotSupported byte = 0x08 // Address type not supported
)
// Buffer size limits.
const (
MaxSocksHeaderSize = 262 // Maximum size of SOCKS header in bytes
MaxUDPPacketSize = 65535 // Maximum size of UDP datagram in bytes
)
pkg/proxy/socks/socks.go
+264
View File
@@ -0,0 +1,264 @@
// Package proxy implements SOCKS5 proxy functionality.
// It provides a complete SOCKS5 implementation following RFC 1928, supporting
// CONNECT and UDP ASSOCIATE (BIND not implemented) commands with NoAuth authentication.
package proxy
import (
"context"
"slices"
"proxyblob/pkg/protocol"
"proxyblob/pkg/transport"
"github.com/google/uuid"
)
// SocksHandler implements a SOCKS5 protocol handler.
// It processes authentication, commands, and data transfer between clients
// and remote targets. The handler is safe for concurrent use.
type SocksHandler struct {
*protocol.BaseHandler
}
// NewSocksHandler creates a SOCKS5 handler with the given transport.
// The transport is used for sending and receiving protocol messages.
func NewSocksHandler(ctx context.Context, transport transport.Transport) *SocksHandler {
handler := &SocksHandler{}
handler.BaseHandler = protocol.NewBaseHandler(ctx, transport)
handler.PacketHandler = handler
return handler
}
// Start begins processing SOCKS5 requests. The address parameter is ignored
// as there are no listeners on the agent side.
func (h *SocksHandler) Start(address string) {
go h.ReceiveLoop()
}
// Stop gracefully terminates the handler, closing all active connections
// and canceling the context.
func (h *SocksHandler) Stop() {
h.CloseAllConnections()
h.Cancel()
}
// OnNew handles new connection requests by initializing it and
// starting the SOCKS5 protocol flow.
func (h *SocksHandler) OnNew(connectionID uuid.UUID, data []byte) byte {
// Check if the connection already exists
if _, ok := h.Connections.Load(connectionID); ok {
return protocol.ErrConnectionExists
}
// Create new connection
conn := protocol.NewConnection(connectionID)
h.Connections.Store(conn.ID, conn)
// Process the server's nonce and public key from data
if len(data) >= 24+32 {
// Extract nonce and server public key
nonce := data[:24]
serverPublicKey := data[24 : 24+32]
// Store temporary data for key derivation during ACK
tmp := make([]byte, len(nonce)+len(serverPublicKey))
copy(tmp[:len(nonce)], nonce)
copy(tmp[len(nonce):], serverPublicKey)
conn.SecretKey = tmp
}
// Send connection acknowledgment
errCode := h.SendConnAck(connectionID)
if errCode != protocol.ErrNone {
return errCode
}
// Process the connection
go h.processConnection(conn)
return protocol.ErrNone
}
// OnAck reports ErrUnexpectedPacket as the agent only accepts incoming
// connections and does not initiate them.
func (h *SocksHandler) OnAck(connectionID uuid.UUID, data []byte) byte {
return protocol.ErrUnexpectedPacket
}
// OnData processes incoming data for a connection.
// It decrypts the data and forwards it to the connection's read buffer.
func (h *SocksHandler) OnData(connectionID uuid.UUID, data []byte) byte {
value, ok := h.Connections.Load(connectionID)
if !ok {
return protocol.ErrConnectionNotFound
}
conn := value.(*protocol.Connection)
decrypted, errCode := protocol.Decrypt(conn.SecretKey, data)
if errCode != protocol.ErrNone {
h.SendClose(connectionID, protocol.ErrInvalidCrypto)
return errCode
}
data = decrypted
select {
case <-h.Ctx.Done():
return protocol.ErrConnectionClosed
case conn.ReadBuffer <- data:
return protocol.ErrNone
}
}
// OnClose cleans up resources associated with a connection.
// It is safe to call multiple times.
func (h *SocksHandler) OnClose(connectionID uuid.UUID, errorCode byte) byte {
value, ok := h.Connections.Load(connectionID)
if !ok {
return protocol.ErrNone // Connection already removed, nothing to do
}
conn := value.(*protocol.Connection)
conn.Close()
h.Connections.Delete(connectionID)
return protocol.ErrNone
}
// processConnection handles the SOCKS5 protocol flow for a single connection.
// The flow consists of three phases:
//
// 1. Authentication method negotiation
// 2. Command processing (CONNECT, UDP ASSOCIATE)
// 3. Data transfer between client and target
func (h *SocksHandler) processConnection(conn *protocol.Connection) {
// SOCKS protocol has 3 sequential phases
errCode := h.handleAuthNegotiation(conn)
if errCode != protocol.ErrNone {
h.SendClose(conn.ID, errCode)
return
}
errCode = h.handleCommand(conn)
if errCode != protocol.ErrNone {
h.SendClose(conn.ID, errCode)
return
}
errCode = h.handleDataTransfer(conn)
if errCode != protocol.ErrNone {
h.SendClose(conn.ID, errCode)
return
}
}
// SendError sends a SOCKS5 error reply to the client.
// It maps internal error codes to SOCKS5 reply codes as defined in RFC 1928.
func (h *SocksHandler) SendError(conn *protocol.Connection, errCode byte) {
// Default to general failure
socksReplyCode := GeneralFailure
// Map internal error codes to SOCKS reply codes
switch errCode {
case protocol.ErrNone:
socksReplyCode = Succeeded
case protocol.ErrNetworkUnreachable:
socksReplyCode = NetworkUnreachable
case protocol.ErrHostUnreachable:
socksReplyCode = HostUnreachable
case protocol.ErrConnectionRefused:
socksReplyCode = ConnectionRefused
case protocol.ErrTTLExpired:
socksReplyCode = TTLExpired
case protocol.ErrUnsupportedCommand:
socksReplyCode = CommandNotSupported
case protocol.ErrAddressNotSupported:
socksReplyCode = AddressTypeNotSupported
case protocol.ErrAuthFailed:
socksReplyCode = NoAcceptableMethods
}
// Build and send error response
response := []byte{Version5, socksReplyCode, 0x00, IPv4, 0, 0, 0, 0, 0, 0}
h.SendData(conn.ID, response)
}
// handleAuthNegotiation processes the client's authentication method selection.
// Currently only the NO AUTHENTICATION REQUIRED (0x00) method is supported.
func (h *SocksHandler) handleAuthNegotiation(conn *protocol.Connection) byte {
select {
case methods := <-conn.ReadBuffer:
// Currently we only support NoAuth (0x00)
if !slices.Contains(methods, NoAuth) {
h.SendError(conn, protocol.ErrAuthFailed)
return protocol.ErrAuthFailed
}
// Send response
errCode := h.SendData(conn.ID, []byte{Version5, NoAuth})
if errCode != protocol.ErrNone {
return errCode
}
return protocol.ErrNone
case <-conn.Closed:
return protocol.ErrConnectionClosed
case <-h.Ctx.Done():
return protocol.ErrHandlerStopped
}
}
// handleCommand processes SOCKS5 commands from the client.
// Supported commands are:
//
// - CONNECT (0x01): Establish TCP/IP stream connection
// - UDP ASSOCIATE (0x03): UDP relay
//
// Unsupported commands are:
//
// - BIND (0x02): TCP/IP port binding
func (h *SocksHandler) handleCommand(conn *protocol.Connection) byte {
select {
case cmdData := <-conn.ReadBuffer:
// Validate command format
if len(cmdData) < 4 {
h.SendError(conn, protocol.ErrInvalidPacket)
return protocol.ErrInvalidPacket
}
// Check SOCKS version
if cmdData[0] != Version5 {
h.SendError(conn, protocol.ErrInvalidSocksVersion)
return protocol.ErrInvalidSocksVersion
}
var errCode byte
switch cmdData[1] {
case Connect:
errCode = h.handleConnect(conn, cmdData)
case Bind:
errCode = h.handleBind(conn, cmdData)
case UDPAssociate:
errCode = h.handleUDPAssociate(conn)
default:
h.SendError(conn, protocol.ErrUnsupportedCommand)
return protocol.ErrUnsupportedCommand
}
return errCode
case <-conn.Closed:
return protocol.ErrConnectionClosed
case <-h.Ctx.Done():
return protocol.ErrHandlerStopped
}
}
// handleDataTransfer manages the flow of data between client and target.
// Each command handler implements its own data transfer mechanism.
func (h *SocksHandler) handleDataTransfer(conn *protocol.Connection) byte {
// Each command handler takes care of data transfer
// Just wait for connection to be closed
<-conn.Closed
return protocol.ErrNone
}
pkg/proxy/socks/udp_associate.go
+323
View File
@@ -0,0 +1,323 @@
package proxy
import (
"encoding/binary"
"errors"
"net"
"time"
"proxyblob/pkg/protocol"
)
// handleUDPAssociate processes the SOCKS5 UDP ASSOCIATE command.
// It creates a UDP relay that allows clients to send and receive
// UDP datagrams through the SOCKS server.
//
// The process involves:
// 1. Creating a UDP socket for client communication
// 2. Sending the socket address back to the client
// 3. Maintaining the TCP control connection
// 4. Relaying UDP datagrams between client and targets
//
// The command format follows RFC 1928 Section 4.
func (h *SocksHandler) handleUDPAssociate(conn *protocol.Connection) byte {
// Create UDP socket
udpAddr, err := net.ResolveUDPAddr("udp", "0.0.0.0:0")
if err != nil {
// Send network unreachable error
h.SendError(conn, protocol.ErrNetworkUnreachable)
return protocol.ErrNetworkUnreachable
}
udpConn, err := net.ListenUDP("udp", udpAddr)
if err != nil {
// Determine specific error type
errCode := protocol.ErrGeneralSocksFailure
if opErr, ok := err.(*net.OpError); ok {
if errors.Is(opErr, net.ErrClosed) {
errCode = protocol.ErrTransportClosed
} else if opErr.Op == "listen" {
errCode = protocol.ErrNetworkUnreachable
}
}
// Send appropriate error response
h.SendError(conn, errCode)
return errCode
}
// Get the allocated port
localAddr := udpConn.LocalAddr().(*net.UDPAddr)
port := localAddr.Port
// Create response
// Format: |VER|REP|RSV|ATYP|BND.ADDR|BND.PORT|
response := []byte{
Version5, // VER
Succeeded, // REP - success
0, // RSV - reserved, must be 0
IPv4, // ATYP - IPv4
0, 0, 0, 0, // BND.ADDR - 0.0.0.0 (any address)
byte(port >> 8), // BND.PORT - high byte
byte(port & 0xff), // BND.PORT - low byte
}
errCode := h.SendData(conn.ID, response)
if errCode != protocol.ErrNone {
udpConn.Close()
return protocol.ErrPacketSendFailed
}
// Store UDP connection and start handling packets
conn.Conn = udpConn
conn.State = protocol.StateConnected
go h.handleUDPPackets(conn)
// Keep the control connection open until it's closed elsewhere
select {
case <-conn.Closed:
// Control connection closed, UDP associate terminated
case <-h.Ctx.Done():
udpConn.Close()
}
return protocol.ErrNone
}
// handleUDPPackets manages the UDP relay for a client.
// It:
// - Receives UDP packets from the client
// - Extracts target addresses from SOCKS headers
// - Forwards packets to targets
// - Receives responses from targets
// - Wraps responses in SOCKS headers
// - Returns them to the client
//
// The relay operates until the control connection closes or
// the context is canceled.
func (h *SocksHandler) handleUDPPackets(conn *protocol.Connection) {
udpConn := conn.Conn.(*net.UDPConn)
buffer := make([]byte, 64*1024)
var clientAddr *net.UDPAddr
// Create a UDP connection for sending to targets
targetConn, err := net.ListenUDP("udp", nil)
if err != nil {
h.SendClose(conn.ID, protocol.ErrNetworkUnreachable)
return
}
// Ensure connections are properly closed when this handler exits
defer targetConn.Close()
// Map to track target addresses and their corresponding responses
type targetInfo struct {
addr *net.UDPAddr
lastActive time.Time
}
targets := make(map[string]*targetInfo)
// Channel for receiving UDP responses
responses := make(chan struct {
data []byte
addr *net.UDPAddr
}, 100)
// Start a goroutine to handle responses
go func() {
respBuf := make([]byte, 128*1024)
for {
// Check for cancellation
select {
case <-h.Ctx.Done():
return
case <-conn.Closed:
return
default:
// Continue processing
}
// Set read deadline
if err := targetConn.SetReadDeadline(time.Now().Add(300 * time.Millisecond)); err != nil {
if errors.Is(err, net.ErrClosed) {
return
}
continue // Non-fatal, just retry
}
n, addr, err := targetConn.ReadFromUDP(respBuf)
if err != nil {
if errors.Is(err, net.ErrClosed) {
return
}
continue
}
if n > 0 {
// Make a copy of the data since respBuf will be reused
data := make([]byte, n)
copy(data, respBuf[:n])
// Send response through channel
select {
case responses <- struct {
data []byte
addr *net.UDPAddr
}{data, addr}:
// Successfully sent
default:
// Channel full, log and continue
}
}
}
}()
// Timeout to clean up inactive targets
ticker := time.NewTicker(30 * time.Second)
defer ticker.Stop()
for {
select {
case <-h.Ctx.Done():
return
case <-conn.Closed:
return
case resp := <-responses:
// Find the target that matches this response
var found bool
for _, target := range targets {
if target.addr.IP.Equal(resp.addr.IP) && target.addr.Port == resp.addr.Port {
// Update last active time
target.lastActive = time.Now()
found = true
break
}
}
if !found {
// Skip unknown targets
continue
}
if clientAddr == nil {
// Skip client address not set
continue
}
// Create response packet with appropriate header
// For simplicity, we'll just use a minimal header with the correct address type
var respHeader []byte
// Determine address type
var addrType byte
if resp.addr.IP.To4() != nil {
addrType = IPv4
} else {
addrType = IPv6
}
// header: RSV(2) + FRAG(0) + ATYP(1) + ADDR + PORT(2)
respHeader = append(respHeader, 0, 0, 0, addrType)
if addrType == IPv4 {
respHeader = append(respHeader, resp.addr.IP.To4()...)
} else {
respHeader = append(respHeader, resp.addr.IP.To16()...)
}
// Add port
portBytes := make([]byte, 2)
binary.BigEndian.PutUint16(portBytes, uint16(resp.addr.Port))
respHeader = append(respHeader, portBytes...)
// Combine header and payload
respPacket := append(respHeader, resp.data...)
_, err = udpConn.WriteToUDP(respPacket, clientAddr)
if err != nil {
if errors.Is(err, net.ErrClosed) {
return
}
}
case <-ticker.C:
// Clean up inactive targets
now := time.Now()
for targetKey, targetInfo := range targets {
if now.Sub(targetInfo.lastActive) > 1*time.Minute {
delete(targets, targetKey)
}
}
default:
// Set read deadline to prevent blocking forever
if err := udpConn.SetReadDeadline(time.Now().Add(300 * time.Millisecond)); err != nil {
if errors.Is(err, net.ErrClosed) {
return
}
continue // Non-fatal
}
n, remoteAddr, err := udpConn.ReadFromUDP(buffer)
if err != nil {
// Handle various error conditions
if errors.Is(err, net.ErrClosed) {
return
}
if netErr, ok := err.(net.Error); ok {
if netErr.Timeout() {
// This is expected due to deadline, don't log
continue
}
}
h.SendClose(conn.ID, protocol.ErrNetworkUnreachable)
return
}
// Store client address from first packet
if clientAddr == nil {
clientAddr = remoteAddr
}
// Only accept packets from original client
if !remoteAddr.IP.Equal(clientAddr.IP) {
continue
}
// Handle UDP packet
if n > 3 {
// Extract target address from UDP header
targetAddr, headerLen, errCode := ExtractUDPHeader(buffer[:n])
if errCode != protocol.ErrNone {
continue
}
// Resolve target address
targetUDPAddr, err := net.ResolveUDPAddr("udp", targetAddr)
if err != nil {
continue
}
// Store target information
targetKey := targetAddr
targets[targetKey] = &targetInfo{
addr: targetUDPAddr,
lastActive: time.Now(),
}
// Send payload to target
_, err = targetConn.WriteToUDP(buffer[headerLen:n], targetUDPAddr)
if err != nil {
if errors.Is(err, net.ErrClosed) {
return
}
continue
}
}
}
}
}
pkg/transport/blob.go
+266
View File
@@ -0,0 +1,266 @@
// Package transport provides interfaces and implementations for communication
// between proxy components. It abstracts the underlying transport mechanism
// and ensures reliable data transfer with proper error handling.
package transport
import (
"bytes"
"context"
"errors"
"io"
"time"
"github.com/Azure/azure-storage-blob-go/azblob"
)
// Retry configuration for blob operations.
const (
InitialRetryDelay = 50 * time.Millisecond // Starting delay between retries
MaxRetryDelay = 3 * time.Second // Maximum delay between retries
BackoffFactor = 1.5 // Multiplier for exponential backoff
)
// BlobTransport implements the Transport interface using Azure Blob Storage.
// It uses separate blobs for reading and writing to provide bidirectional
// communication. All operations are retried with exponential backoff.
type BlobTransport struct {
readBlob azblob.BlockBlobURL // Blob for receiving data
writeBlob azblob.BlockBlobURL // Blob for sending data
}
// NewBlobTransport creates a transport that uses the provided blobs for
// bidirectional communication. The readBlob is used for receiving data,
// and the writeBlob is used for sending data.
func NewBlobTransport(readBlob, writeBlob azblob.BlockBlobURL) *BlobTransport {
return &BlobTransport{
readBlob: readBlob,
writeBlob: writeBlob,
}
}
// Send writes data to the write blob. It blocks until the data is written
// or the context is canceled. Returns an error code indicating success or
// specific failure reason.
func (t *BlobTransport) Send(ctx context.Context, data []byte) byte {
return WriteBlob(ctx, t.writeBlob, data)
}
// Receive reads and clears data from the read blob. It blocks until data
// is available or the context is canceled. Returns the read data and an
// error code indicating success or failure reason.
func (t *BlobTransport) Receive(ctx context.Context) ([]byte, byte) {
return WaitForData(ctx, t.readBlob)
}
// IsClosed reports whether the transport is permanently closed.
func (t *BlobTransport) IsClosed(errCode byte) bool {
return errCode == ErrTransportClosed
}
// WriteBlob attempts to write data to a blob with retry and exponential backoff.
// The operation is retried until successful or the context is canceled.
// Returns an error code indicating success or specific failure reason.
func WriteBlob(ctx context.Context, blobURL azblob.BlockBlobURL, data []byte) byte {
retryDelay := InitialRetryDelay
// Try the operation with unlimited retries
for {
// Check if blob is empty
isEmpty, errCode := IsBlobEmpty(ctx, blobURL)
if errCode != ErrNone {
return errCode
}
if !isEmpty {
// If the blob isn't empty, wait before retrying
retryDelay, errCode = WaitDelay(ctx, retryDelay)
if errCode != ErrNone {
return errCode
}
continue
}
// Reset delay when we find empty blob
retryDelay = InitialRetryDelay
// Upload data to the blob
_, err := blobURL.Upload(
ctx,
bytes.NewReader(data),
azblob.BlobHTTPHeaders{ContentType: "application/octet-stream"},
azblob.Metadata{},
azblob.BlobAccessConditions{},
azblob.DefaultAccessTier,
nil,
azblob.ClientProvidedKeyOptions{},
azblob.ImmutabilityPolicyOptions{},
)
if err != nil {
// If upload fails, check context and retry
if ctx.Err() != nil {
return ErrContextCanceled
}
// Wait before retrying with exponential backoff
retryDelay, errCode = WaitDelay(ctx, retryDelay)
if errCode != ErrNone {
return errCode
}
continue
}
// Success
return ErrNone
}
}
// WaitForData polls a blob until data is available, then reads and clears it.
// The operation is retried with exponential backoff until data is found or
// the context is canceled. Returns the read data and an error code indicating
// success or failure reason.
func WaitForData(ctx context.Context, blobURL azblob.BlockBlobURL) ([]byte, byte) {
var data []byte
retryDelay := InitialRetryDelay
for {
// Check for cancellation
if ctx.Err() != nil {
return nil, ErrContextCanceled
}
// Poll until the blob contains data
isEmpty, errCode := IsBlobEmpty(ctx, blobURL)
if errCode != ErrNone {
return nil, errCode
}
if isEmpty {
// If empty, wait before checking again with exponential backoff
retryDelay, errCode = WaitDelay(ctx, retryDelay)
if errCode != ErrNone {
return nil, errCode
}
continue
}
// Reset delay when we find data
retryDelay = InitialRetryDelay
// Found data, download the blob content
response, err := blobURL.Download(ctx, 0, azblob.CountToEnd, azblob.BlobAccessConditions{}, false, azblob.ClientProvidedKeyOptions{})
if err != nil {
return nil, BlobError(err)
}
bodyReader := response.Body(azblob.RetryReaderOptions{MaxRetryRequests: 3})
defer bodyReader.Close()
// Read the data
data, err = io.ReadAll(bodyReader)
if err != nil {
return nil, ErrTransportError
}
// Clear the blob - no retries here
errCode = ClearBlob(ctx, blobURL)
if errCode != ErrNone {
return nil, errCode
}
return data, ErrNone
}
}
// IsBlobEmpty checks if a blob is empty by retrieving its properties.
// Returns true if the blob has zero content length, and an error code
// indicating success or failure reason.
func IsBlobEmpty(ctx context.Context, blobURL azblob.BlockBlobURL) (bool, byte) {
// Check for cancelation
props, err := blobURL.GetProperties(ctx, azblob.BlobAccessConditions{}, azblob.ClientProvidedKeyOptions{})
if err != nil {
return false, BlobError(err)
}
return props.ContentLength() == 0, ErrNone
}
// ClearBlob empties a blob's contents by uploading an empty byte slice.
// The operation is retried with exponential backoff until successful or
// the context is canceled. Returns an error code indicating success or
// specific failure reason.
func ClearBlob(ctx context.Context, blobURL azblob.BlockBlobURL) byte {
var errCode byte
retryDelay := InitialRetryDelay
// Try the operation with unlimited retries
for {
_, err := blobURL.Upload(
ctx,
bytes.NewReader([]byte{}),
azblob.BlobHTTPHeaders{ContentType: "application/octet-stream"},
azblob.Metadata{},
azblob.BlobAccessConditions{},
azblob.DefaultAccessTier,
nil,
azblob.ClientProvidedKeyOptions{},
azblob.ImmutabilityPolicyOptions{},
)
if err == nil {
// Success, no error
return ErrNone
}
// Wait before retrying with exponential backoff
retryDelay, errCode = WaitDelay(ctx, retryDelay)
if errCode != ErrNone {
return errCode
}
}
}
// BlobError maps Azure Blob Storage errors to transport error codes.
// It handles common error cases like container not found, network issues,
// and authentication failures.
func BlobError(err error) byte {
// Quick check for nil
if err == nil {
return ErrNone
}
// Check for context cancellation
if errors.Is(err, context.Canceled) {
return ErrContextCanceled
}
// Check for container-related errors (indicating transport is closed)
if storageErr, ok := err.(azblob.StorageError); ok {
serviceCode := storageErr.ServiceCode()
if serviceCode == azblob.ServiceCodeContainerNotFound ||
serviceCode == azblob.ServiceCodeContainerBeingDeleted ||
serviceCode == azblob.ServiceCodeAccountBeingCreated {
return ErrTransportClosed
}
}
// All other errors are treated as general transport errors
return ErrTransportError
}
// WaitDelay implements exponential backoff for retry operations.
// It sleeps for the current delay and returns the next delay duration,
// which is the current delay multiplied by BackoffFactor, capped at
// MaxRetryDelay. Returns an error code if the context is canceled.
func WaitDelay(ctx context.Context, retryDelay time.Duration) (time.Duration, byte) {
select {
case <-ctx.Done():
return 0, ErrContextCanceled
case <-time.After(retryDelay):
retryDelay = time.Duration(float64(retryDelay) * BackoffFactor)
if retryDelay > MaxRetryDelay {
retryDelay = MaxRetryDelay
}
return retryDelay, ErrNone
}
}
pkg/transport/transport.go
+38
View File
@@ -0,0 +1,38 @@
// Package transport provides interfaces and implementations for communication
// between proxy components. It abstracts the underlying transport mechanism
// and ensures reliable data transfer with proper error handling.
package transport
import (
"context"
)
// Error codes for transport operations.
const (
ErrNone byte = 0 // Operation completed successfully
ErrContextCanceled byte = 2 // Context was canceled during operation
// Transport errors (20-29)
ErrTransportClosed byte = 20 // Transport is permanently closed
ErrTransportTimeout byte = 21 // Operation exceeded time limit
ErrTransportError byte = 22 // Generic transport error
)
// Transport defines an interface for bidirectional packet communication.
// Implementations must ensure reliable delivery and proper error handling.
// All methods are safe for concurrent use.
type Transport interface {
// Send transmits data to the recipient. It blocks until the data is sent
// or the context is canceled. Returns an error code indicating success
// or specific failure reason.
Send(ctx context.Context, data []byte) byte
// Receive waits for and returns available data. It blocks until data
// is available or the context is canceled. Returns the received data
// and an error code indicating success or failure reason.
Receive(ctx context.Context) ([]byte, byte)
// IsClosed reports whether the transport is permanently closed.
// The error code parameter helps determine the closure reason.
IsClosed(byte) bool
}