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timing.go
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65 lines (51 loc) · 1.7 KB
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package main
import (
"crypto/subtle"
"fmt"
"net/http"
"strings"
)
func bad(w http.ResponseWriter, req *http.Request) (interface{}, error) {
secret := "MySuperSecretPasscode"
secretHeader := "X-Secret"
headerSecret := req.Header.Get(secretHeader)
secretStr := string(secret)
if len(headerSecret) != 0 && headerSecret != secretStr {
return nil, fmt.Errorf("header %s=%s did not match expected secret", secretHeader, headerSecret)
}
return nil, nil
}
func bad2(w http.ResponseWriter, req *http.Request) (interface{}, error) {
secret := "MySuperSecretPasscode"
secretHeader := "X-Secret"
headerSecret := req.Header.Get(secretHeader)
secretStr := string(secret)
if len(headerSecret) != 0 && strings.Compare(headerSecret, secretStr) != 0 {
return nil, fmt.Errorf("header %s=%s did not match expected secret", secretHeader, headerSecret)
}
return nil, nil
}
func bad4(w http.ResponseWriter, req *http.Request) (interface{}, error) {
secret := "MySuperSecretPasscode"
secretHeader := "X-Secret"
headerSecret := req.Header.Get(secretHeader)
if len(secret) != 0 && headerSecret != "SecretStringLiteral" {
return nil, fmt.Errorf("header %s=%s did not match expected secret", secretHeader, headerSecret)
}
return nil, nil
}
func good(w http.ResponseWriter, req *http.Request) (interface{}, error) {
secret := []byte("MySuperSecretPasscode")
secretHeader := "X-Secret"
headerSecret := req.Header.Get(secretHeader)
if len(secret) != 0 && subtle.ConstantTimeCompare(secret, []byte(headerSecret)) != 1 {
return nil, fmt.Errorf("header %s=%s did not match expected secret", secretHeader, headerSecret)
}
return nil, nil
}
func main() {
bad(nil, nil)
good(nil, nil)
bad2(nil, nil)
bad4(nil, nil)
}