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KostLinux
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| Original file line number | Diff line number | Diff line change |
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| # Example of a secure web application with Gin | ||
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| This is an example of a secure web application with Gin. It includes the following security headers: | ||
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| - Content-Security-Policy | ||
| - Permissions-Policy | ||
| - Referrer-Policy | ||
| - Strict-Transport-Security | ||
| - X-Frame-Options | ||
| - X-Xss-Protection | ||
| - X-Content-Type-Options | ||
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| Also the web application has strict Host Header to avoid SSRF and Host Header Injection. | ||
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| 1. Security Headers Example | ||
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| ``` | ||
| christofherkost at L-EEM091 in ~/D/s/c/gin-examples | ||
| ↪ curl http://localhost:8080 -I | ||
| HTTP/1.1 404 Not Found | ||
| Content-Security-Policy: default-src 'self'; connect-src *; font-src *; script-src-elem * 'unsafe-inline'; img-src * data:; style-src * 'unsafe-inline'; | ||
| Content-Type: text/plain | ||
| Permissions-Policy: geolocation=(),midi=(),sync-xhr=(),microphone=(),camera=(),magnetometer=(),gyroscope=(),fullscreen=(self),payment=() | ||
| Referrer-Policy: strict-origin | ||
| Strict-Transport-Security: max-age=31536000; includeSubDomains; preload | ||
| X-Content-Type-Options: nosniff | ||
| X-Frame-Options: DENY | ||
| X-Xss-Protection: 1; mode=block | ||
| Date: Thu, 28 Mar 2024 11:38:05 GMT | ||
| Content-Length: 18 | ||
| ``` | ||
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| 2. Host Header Injection Example | ||
| ``` | ||
| christofherkost at L-EEM091 in ~/D/s/c/gin-examples | ||
| ↪ curl http://localhost:8080 -I -H "Host:neti.ee" | ||
| HTTP/1.1 400 Bad Request | ||
| Content-Type: application/json; charset=utf-8 | ||
| Date: Thu, 28 Mar 2024 11:38:23 GMT | ||
| Content-Length: 31 | ||
| ``` |
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| package main | ||
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| import ( | ||
| "log" | ||
| "net/http" | ||
| "os" | ||
| "time" | ||
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| "github.com/gin-contrib/static" | ||
| "github.com/gin-gonic/gin" | ||
| ) | ||
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| func NewRouter() *gin.Engine { | ||
| // Set the router as the default one shipped with Gin | ||
| router := gin.Default() | ||
| expectedHost := "localhost:8080" | ||
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| // Setup Security Headers | ||
| router.Use(func(c *gin.Context) { | ||
| if c.Request.Host != expectedHost { | ||
| c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "Invalid host header"}) | ||
| return | ||
| } | ||
| c.Header("X-Frame-Options", "DENY") | ||
| c.Header("Content-Security-Policy", "default-src 'self'; connect-src *; font-src *; script-src-elem * 'unsafe-inline'; img-src * data:; style-src * 'unsafe-inline';") | ||
| c.Header("X-XSS-Protection", "1; mode=block") | ||
| c.Header("Strict-Transport-Security", "max-age=31536000; includeSubDomains; preload") | ||
| c.Header("Referrer-Policy", "strict-origin") | ||
| c.Header("X-Content-Type-Options", "nosniff") | ||
| c.Header("Permissions-Policy", "geolocation=(),midi=(),sync-xhr=(),microphone=(),camera=(),magnetometer=(),gyroscope=(),fullscreen=(self),payment=()") | ||
| c.Next() | ||
| }) | ||
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| // Serve frontend static files | ||
| router.Use(static.Serve("/", static.LocalFile("./public/", true))) | ||
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| // Setup route group for the API | ||
| api := router.Group("/api") | ||
| { | ||
| apiHandler := func(c *gin.Context) { | ||
| c.JSON(http.StatusOK, gin.H{ | ||
| "message": "Uniform API", | ||
| }) | ||
| } | ||
| api.GET("", apiHandler) | ||
| api.GET("/", apiHandler) | ||
| } | ||
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| return router | ||
| } | ||
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| func main() { | ||
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| httpPort := os.Getenv("API_PORT") | ||
| if httpPort == "" { | ||
| httpPort = "8080" | ||
| } | ||
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| // Initialize router | ||
| router := NewRouter() | ||
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| // Create server with timeout | ||
| srv := &http.Server{ | ||
| Addr: ":" + httpPort, | ||
| Handler: router, | ||
| // set timeout due CWE-400 - Potential Slowloris Attack | ||
| ReadHeaderTimeout: 5 * time.Second, | ||
| } | ||
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| if err := srv.ListenAndServe(); err != nil { | ||
| log.Printf("Failed to start server: %v", err) | ||
| } | ||
| } |