c3dc549ceb
This is modtly (to try) preventing malicious client-side code, like browser extensions, from reading social media tokens easily. Since this application doesn't have a database, this is the best that can be done.
105 lines
1.9 KiB
Go
105 lines
1.9 KiB
Go
package middlewares
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"encoding/base64"
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"net/http"
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"strings"
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)
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type CookiesCryptoMiddleware struct {
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Key string
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}
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func (m CookiesCryptoMiddleware) Serve(handler http.HandlerFunc) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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m.decryptCookies(r)
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handler(w, r)
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m.encryptCookies(w)
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}
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}
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func (m CookiesCryptoMiddleware) encrypt(pt string) string {
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aes, err := aes.NewCipher([]byte(m.Key))
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if err != nil {
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panic(err)
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}
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gcm, err := cipher.NewGCM(aes)
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if err != nil {
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panic(err)
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}
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nonce := make([]byte, gcm.NonceSize())
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_, err = rand.Read(nonce)
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if err != nil {
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panic(err)
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}
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ct := gcm.Seal(nonce, nonce, []byte(pt), nil)
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return base64.URLEncoding.EncodeToString(ct)
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}
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func (m CookiesCryptoMiddleware) encryptCookies(w http.ResponseWriter) {
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cookies := w.Header().Values("Set-Cookie")
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w.Header().Del("Set-Cookie")
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for _, c := range cookies {
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cv := strings.Split(c, ";")
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var c, attrs string
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if len(cv) > 1 {
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c, attrs = cv[0], strings.Join(cv[1:], ";")
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} else {
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c = cv[0]
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}
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cn, v := strings.Split(c, "=")[0], strings.Split(c, "=")[1]
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v = m.encrypt(strings.Trim(v, "\""))
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c = cn + "=\"" + v + "\";" + attrs
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w.Header().Add("Set-Cookie", c)
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}
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}
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func (m CookiesCryptoMiddleware) decrypt(ct string) string {
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cb, err := base64.URLEncoding.DecodeString(ct)
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if err != nil {
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panic(err)
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}
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ct = string(cb)
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aes, err := aes.NewCipher([]byte(m.Key))
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if err != nil {
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panic(err)
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}
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gcm, err := cipher.NewGCM(aes)
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if err != nil {
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panic(err)
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}
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nonceSize := gcm.NonceSize()
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nonce, ct := ct[:nonceSize], ct[nonceSize:]
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pt, err := gcm.Open(nil, []byte(nonce), []byte(ct), nil)
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if err != nil {
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panic(err)
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}
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return string(pt)
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}
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func (m CookiesCryptoMiddleware) decryptCookies(r *http.Request) {
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rcookies := r.Cookies()
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r.Header.Del("Cookie")
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for _, c := range rcookies {
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c.Value = m.decrypt(c.Value)
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r.AddCookie(c)
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}
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}
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