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package main
import (
"crypto/sha256"
"crypto/subtle"
"fmt"
"log"
"net"
"net/http"
)
func auth(w http.ResponseWriter, r *http.Request) (string, bool) {
if len(users) == 0 {
return "n/a", *noPwdDbRW
}
ip, _, err := net.SplitHostPort(r.RemoteAddr)
if err != nil {
log.Print(err)
return "", false
}
if f2b.check(ip) {
log.Printf("auth: %v is banned", ip)
http.Error(w, "Too many bad username/password attempts", http.StatusTooManyRequests)
return "", false
}
u, p, ok := r.BasicAuth()
if !ok || u == "" {
log.Printf("no auth header for %v (u=%v)", ip, u)
goto unauth
}
for _, usr := range users {
if subtle.ConstantTimeCompare([]byte(u), []byte(usr.User)) != 1 {
continue
}
s := fmt.Sprintf("%x", sha256.Sum256([]byte(usr.Salt+p)))
if subtle.ConstantTimeCompare([]byte(s), []byte(usr.Hash)) == 1 {
go f2b.unban(ip)
return usr.User, usr.RW
}
}
log.Printf("auth: found no matching usr/pwd ip=%v u=%v)", ip, u)
f2b.ban(ip)
// ideally we should return here but firefox keeps feeding wrong creds
// setting authenticate header instead to force new user/pass window
// empty username will not ban the client so it will work at second try
unauth:
w.Header().Set("WWW-Authenticate", "Basic realm=\"wfm\"")
http.Error(w, "Unauthorized", http.StatusUnauthorized)
return "", false
}
// this doesn't really work
func logout(w http.ResponseWriter) {
http.Error(w, "Logged out", http.StatusUnauthorized)
}
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