Initial Commit

executor.go

@@ -0,0 +1,108 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"os/exec"
+	"strings"
+	"time"
+)
+
+// CommandExecutor handles safe execution of diagnostic commands
+type CommandExecutor struct {
+	timeout time.Duration
+}
+
+// NewCommandExecutor creates a new command executor with specified timeout
+func NewCommandExecutor(timeout time.Duration) *CommandExecutor {
+	return &CommandExecutor{
+		timeout: timeout,
+	}
+}
+
+// Execute executes a command safely with timeout and validation
+func (ce *CommandExecutor) Execute(cmd Command) CommandResult {
+	result := CommandResult{
+		ID:      cmd.ID,
+		Command: cmd.Command,
+	}
+
+	// Validate command safety
+	if err := ce.validateCommand(cmd.Command); err != nil {
+		result.Error = fmt.Sprintf("unsafe command: %s", err.Error())
+		result.ExitCode = 1
+		return result
+	}
+
+	// Create context with timeout
+	ctx, cancel := context.WithTimeout(context.Background(), ce.timeout)
+	defer cancel()
+
+	// Execute command using shell for proper handling of pipes, redirects, etc.
+	execCmd := exec.CommandContext(ctx, "/bin/bash", "-c", cmd.Command)
+
+	output, err := execCmd.CombinedOutput()
+	result.Output = string(output)
+
+	if err != nil {
+		result.Error = err.Error()
+		if exitError, ok := err.(*exec.ExitError); ok {
+			result.ExitCode = exitError.ExitCode()
+		} else {
+			result.ExitCode = 1
+		}
+	} else {
+		result.ExitCode = 0
+	}
+
+	return result
+}
+
+// validateCommand checks if a command is safe to execute
+func (ce *CommandExecutor) validateCommand(command string) error {
+	// Convert to lowercase for case-insensitive checking
+	cmd := strings.ToLower(strings.TrimSpace(command))
+
+	// List of dangerous commands/patterns
+	dangerousPatterns := []string{
+		"rm ", "rm\t", "rm\n",
+		"mv ", "mv\t", "mv\n",
+		"dd ", "dd\t", "dd\n",
+		"mkfs", "fdisk", "parted",
+		"shutdown", "reboot", "halt", "poweroff",
+		"passwd", "userdel", "usermod",
+		"chmod", "chown", "chgrp",
+		"systemctl stop", "systemctl disable", "systemctl mask",
+		"service stop", "service disable",
+		"kill ", "killall", "pkill",
+		"crontab -r", "crontab -e",
+		"iptables -F", "iptables -D", "iptables -I",
+		"umount ", "unmount ", // Allow mount but not umount
+		"wget ", "curl ", // Prevent network operations
+		"| dd", "| rm", "| mv", // Prevent piping to dangerous commands
+	}
+
+	// Check for dangerous patterns
+	for _, pattern := range dangerousPatterns {
+		if strings.Contains(cmd, pattern) {
+			return fmt.Errorf("command contains dangerous pattern: %s", pattern)
+		}
+	}
+
+	// Additional checks for commands that start with dangerous operations
+	if strings.HasPrefix(cmd, "rm ") || strings.HasPrefix(cmd, "rm\t") {
+		return fmt.Errorf("rm command not allowed")
+	}
+
+	// Check for sudo usage (we want to avoid automated sudo commands)
+	if strings.HasPrefix(cmd, "sudo ") {
+		return fmt.Errorf("sudo commands not allowed for automated execution")
+	}
+
+	// Check for dangerous redirections (but allow safe ones like 2>/dev/null)
+	if strings.Contains(cmd, ">") && !strings.Contains(cmd, "2>/dev/null") && !strings.Contains(cmd, ">/dev/null") {
+		return fmt.Errorf("file redirection not allowed except to /dev/null")
+	}
+
+	return nil
+}