Add agent distribution system

aggregator-server/cmd/server/main.go

@@ -101,6 +101,7 @@ func main() {
 	dockerHandler := handlers.NewDockerHandler(updateQueries, agentQueries, commandQueries)
 	registrationTokenHandler := handlers.NewRegistrationTokenHandler(registrationTokenQueries, agentQueries, cfg)
 	rateLimitHandler := handlers.NewRateLimitHandler(rateLimiter)
+	downloadHandler := handlers.NewDownloadHandler(filepath.Join(".", "redflag-agent"))
 
 	// Setup router
 	router := gin.Default()
@@ -181,6 +182,10 @@ func main() {
 			dashboard.POST("/docker/containers/:container_id/images/:image_id/reject", dockerHandler.RejectUpdate)
 			dashboard.POST("/docker/containers/:container_id/images/:image_id/install", dockerHandler.InstallUpdate)
 
+			// Download routes (authenticated)
+			dashboard.GET("/downloads/:platform", downloadHandler.DownloadAgent)
+			dashboard.GET("/install/:platform", downloadHandler.InstallScript)
+
 			// Admin/Registration Token routes (for agent enrollment management)
 			admin := dashboard.Group("/admin")
 			{

aggregator-server/internal/api/handlers/downloads.go

@@ -0,0 +1,127 @@
+package handlers
+
+import (
+	"net/http"
+	"path/filepath"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
+// DownloadHandler handles agent binary downloads
+type DownloadHandler struct {
+	agentDir string
+}
+
+func NewDownloadHandler(agentDir string) *DownloadHandler {
+	return &DownloadHandler{
+		agentDir: agentDir,
+	}
+}
+
+// DownloadAgent serves agent binaries for different platforms
+func (h *DownloadHandler) DownloadAgent(c *gin.Context) {
+	platform := c.Param("platform")
+
+	// Validate platform to prevent directory traversal
+	validPlatforms := map[string]bool{
+		"linux-amd64":   true,
+		"linux-arm64":   true,
+		"windows-amd64": true,
+		"windows-arm64": true,
+		"darwin-amd64":  true,
+		"darwin-arm64":  true,
+	}
+
+	if !validPlatforms[platform] {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid platform"})
+		return
+	}
+
+	filename := "redflag-agent"
+	if strings.HasPrefix(platform, "windows") {
+		filename += ".exe"
+	}
+
+	agentPath := filepath.Join(h.agentDir, filename)
+	c.File(agentPath)
+}
+
+// InstallScript serves the installation script
+func (h *DownloadHandler) InstallScript(c *gin.Context) {
+	platform := c.Param("platform")
+
+	// Validate platform
+	validPlatforms := map[string]bool{
+		"linux": true,
+		"darwin": true,
+		"windows": true,
+	}
+
+	if !validPlatforms[platform] {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid platform"})
+		return
+	}
+
+	scriptContent := h.generateInstallScript(platform, c.Request.Host)
+	c.Header("Content-Type", "text/plain")
+	c.String(http.StatusOK, scriptContent)
+}
+
+func (h *DownloadHandler) generateInstallScript(platform, serverHost string) string {
+	baseURL := "http://" + serverHost
+
+	switch platform {
+	case "linux":
+		return `#!/bin/bash
+set -e
+
+REDFLAG_SERVER="` + baseURL + `"
+AGENT_DIR="/usr/local/bin"
+SERVICE_NAME="redflag-agent"
+
+# Check if running as root
+if [ "$EUID" -ne 0 ]; then
+    echo "Please run as root or with sudo"
+    exit 1
+fi
+
+echo "Installing RedFlag agent from ${REDFLAG_SERVER}..."
+
+# Download agent
+curl -sfL "${REDFLAG_SERVER}/api/v1/downloads/linux-amd64" -o "${AGENT_DIR}/redflag-agent"
+chmod +x "${AGENT_DIR}/redflag-agent"
+
+echo "Agent downloaded. Please visit ${REDFLAG_SERVER}/admin to get a registration token."
+echo "Then run: ${AGENT_DIR}/redflag-agent --server ${REDFLAG_SERVER} --token <YOUR_TOKEN>"`
+
+	case "darwin":
+		return `#!/bin/bash
+set -e
+
+REDFLAG_SERVER="` + baseURL + `"
+AGENT_DIR="/usr/local/bin"
+
+echo "Installing RedFlag agent from ${REDFLAG_SERVER}..."
+
+# Download agent
+curl -sfL "${REDFLAG_SERVER}/api/v1/downloads/darwin-amd64" -o "${AGENT_DIR}/redflag-agent"
+chmod +x "${AGENT_DIR}/redflag-agent"
+
+echo "Agent downloaded. Please visit ${REDFLAG_SERVER}/admin to get a registration token."
+echo "Then run: ${AGENT_DIR}/redflag-agent --server ${REDFLAG_SERVER} --token <YOUR_TOKEN>"`
+
+	case "windows":
+		return `@echo off
+set REDFLAG_SERVER=` + baseURL + `
+
+echo Downloading RedFlag agent from %REDFLAG_SERVER%...
+curl -sfL "%REDFLAG_SERVER%/api/v1/downloads/windows-amd64" -o redflag-agent.exe
+
+echo Agent downloaded. Please visit %REDFLAG_SERVER%/admin to get a registration token.
+echo Then run: redflag-agent.exe --server %REDFLAG_SERVER% --token <YOUR_TOKEN%`
+
+	default:
+		return "# Unsupported platform"
+	}
+}