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cookie.go
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cookie.go
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package csrf
import (
"net/http"
"github.com/openshift/origin/pkg/oauthserver/server/crypto"
)
type cookieCsrf struct {
name string
path string
domain string
secure bool
}
// NewCookieCSRF stores random CSRF tokens in a cookie created with the given options.
// Empty CSRF tokens or tokens that do not match the value of the cookie on the request
// are rejected.
func NewCookieCSRF(name, path, domain string, secure bool) CSRF {
return &cookieCsrf{
name: name,
path: path,
domain: domain,
secure: secure,
}
}
// Generate implements the CSRF interface
func (c *cookieCsrf) Generate(w http.ResponseWriter, req *http.Request) string {
// reuse the session cookie if we already have one
// this makes us more tolerant of multiple clicks against the login page
cookie, err := req.Cookie(c.name)
if err == nil && len(cookie.Value) > 0 {
return cookie.Value
}
// do not set Expires or MaxAge to make this a session cookie
cookie = &http.Cookie{
Name: c.name,
Value: crypto.Random256BitsString(),
Path: c.path,
Domain: c.domain,
Secure: c.secure,
HttpOnly: true,
}
http.SetCookie(w, cookie)
return cookie.Value
}
// Check implements the CSRF interface
func (c *cookieCsrf) Check(req *http.Request, value string) bool {
if len(value) == 0 {
return false
}
cookie, err := req.Cookie(c.name)
if err != nil { // the only error returned here is ErrNoCookie
return false
}
return crypto.IsEqualConstantTime(cookie.Value, value)
}