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CorsGin.go
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package main
import (
"net/http"
"time"
"github.com/gin-contrib/cors"
"github.com/gin-gonic/gin"
)
// Function is vulnerable due to AllowAllOrigins = true aka Access-Control-Allow-Origin: null
func vulnerable1() {
router := gin.Default()
// CORS for https://foo.com and null
// - PUT and PATCH methods
// - Origin header
// - Credentials share
// - Preflight requests cached for 12 hours
config_vulnerable := cors.Config{
AllowMethods: []string{"PUT", "PATCH"},
AllowHeaders: []string{"Origin"},
ExposeHeaders: []string{"Content-Length"},
AllowCredentials: true,
MaxAge: 12 * time.Hour,
}
config_vulnerable.AllowOrigins = []string{"null", "https://foo.com"} // $ Alert
router.Use(cors.New(config_vulnerable))
router.GET("/", func(c *gin.Context) {
c.String(http.StatusOK, "hello world")
})
router.Run()
}
// Function is vulnerable due to AllowAllOrigins = true aka Access-Control-Allow-Origin: null
func vulnerable2() {
router := gin.Default()
// CORS for https://foo.com and null
// - PUT and PATCH methods
// - Origin header
// - Credentials share
// - Preflight requests cached for 12 hours
config_vulnerable := cors.Config{
AllowMethods: []string{"PUT", "PATCH"},
AllowHeaders: []string{"Origin"},
ExposeHeaders: []string{"Content-Length"},
AllowCredentials: true,
AllowOrigins: []string{"null", "https://foo.com"}, // $ Alert
MaxAge: 12 * time.Hour,
}
router.Use(cors.New(config_vulnerable))
router.GET("/", func(c *gin.Context) {
c.String(http.StatusOK, "hello world")
})
router.Run()
}
// Function is safe due to hardcoded origin and AllowCredentials: true
func safe() {
router := gin.Default()
// CORS for https://foo.com origin, allowing:
// - PUT and PATCH methods
// - Origin header
// - Credentials share
// - Preflight requests cached for 12 hours
config_safe := cors.Config{
AllowMethods: []string{"PUT", "PATCH"},
AllowHeaders: []string{"Origin"},
ExposeHeaders: []string{"Content-Length"},
AllowCredentials: true,
MaxAge: 12 * time.Hour,
}
config_safe.AllowOrigins = []string{"https://foo.com"}
router.Use(cors.New(config_safe))
router.GET("/", func(c *gin.Context) {
c.String(http.StatusOK, "hello world")
})
router.Run()
}
// Function is safe due to AllowAllOrigins = true aka Access-Control-Allow-Origin: *
func AllowAllTrue1() {
router := gin.Default()
// CORS for "*" origin, allowing:
// - PUT and PATCH methods
// - Origin header
// - Credentials share
// - Preflight requests cached for 12 hours
config_allowall := cors.Config{
AllowMethods: []string{"PUT", "PATCH"},
AllowHeaders: []string{"Origin"},
ExposeHeaders: []string{"Content-Length"},
AllowCredentials: true,
MaxAge: 12 * time.Hour,
}
config_allowall.AllowOrigins = []string{"null"}
config_allowall.AllowAllOrigins = true
router.Use(cors.New(config_allowall))
router.GET("/", func(c *gin.Context) {
c.String(http.StatusOK, "hello world")
})
router.Run()
}
// Function is safe due to AllowAllOrigins = true aka Access-Control-Allow-Origin: *
func AllowAllTrue2() {
router := gin.Default()
// CORS for "*" origin, allowing:
// - PUT and PATCH methods
// - Origin header
// - Credentials share
// - Preflight requests cached for 12 hours
config_allowall := cors.Config{
AllowMethods: []string{"PUT", "PATCH"},
AllowHeaders: []string{"Origin"},
ExposeHeaders: []string{"Content-Length"},
AllowAllOrigins: true,
AllowCredentials: true,
MaxAge: 12 * time.Hour,
}
config_allowall.AllowOrigins = []string{"null"}
router.Use(cors.New(config_allowall))
router.GET("/", func(c *gin.Context) {
c.String(http.StatusOK, "hello world")
})
router.Run()
}
func NoVariableVulnerable() {
router := gin.Default()
// CORS for https://foo.com origin, allowing:
// - PUT and PATCH methods
// - Origin header
// - Credentials share
// - Preflight requests cached for 12 hours
router.Use(cors.New(cors.Config{
AllowMethods: []string{"GET", "POST"},
AllowHeaders: []string{"Origin"},
ExposeHeaders: []string{"Content-Length"},
AllowOrigins: []string{"null", "https://foo.com"}, // $ Alert
AllowCredentials: true,
MaxAge: 12 * time.Hour,
}))
router.GET("/", func(c *gin.Context) {
c.String(http.StatusOK, "hello world")
})
router.Run()
}
var global_config1 = cors.Config{
AllowMethods: []string{"PUT", "PATCH"},
AllowHeaders: []string{"Origin"},
ExposeHeaders: []string{"Content-Length"},
AllowCredentials: true,
AllowOrigins: []string{"null", "https://foo.com"}, // $ Alert
MaxAge: 12 * time.Hour,
}
func vulnerableGlobal1() {
router := gin.Default()
router.Use(cors.New(global_config1))
router.GET("/", func(c *gin.Context) {
c.String(http.StatusOK, "hello world")
})
router.Run()
}
var global_config2 = cors.Config{
AllowMethods: []string{"PUT", "PATCH"},
AllowHeaders: []string{"Origin"},
ExposeHeaders: []string{"Content-Length"},
AllowCredentials: true,
MaxAge: 12 * time.Hour,
}
func vulnerableGlobal2() {
router := gin.Default()
global_config2.AllowOrigins = []string{"null", "https://foo.com"} // $ MISSING: Alert
router.Use(cors.New(global_config2))
router.GET("/", func(c *gin.Context) {
c.String(http.StatusOK, "hello world")
})
router.Run()
}