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package db
import (
"crypto"
"crypto/rsa"
"crypto/sha256"
"crypto/x509"
"encoding/base64"
"encoding/pem"
"strings"
"time"
"github.com/FChannel0/FChannel-Server/activitypub"
"github.com/FChannel0/FChannel-Server/webfinger"
"github.com/gofiber/fiber/v2"
)
func VerifyHeaderSignature(ctx *fiber.Ctx, actor activitypub.Actor) bool {
s := activitypub.ParseHeaderSignature(ctx.Get("Signature"))
var method string
var path string
var host string
var date string
var digest string
var contentLength string
var sig string
for i, e := range s.Headers {
var nl string
if i < len(s.Headers)-1 {
nl = "\n"
}
switch e {
case "(request-target)":
method = strings.ToLower(ctx.Method())
path = ctx.Path()
sig += "(request-target): " + method + " " + path + "" + nl
break
case "host":
host = ctx.Hostname()
sig += "host: " + host + "" + nl
break
case "date":
date = ctx.Get("date")
sig += "date: " + date + "" + nl
break
case "digest":
digest = ctx.Get("digest")
sig += "digest: " + digest + "" + nl
break
case "content-length":
contentLength = ctx.Get("content-length")
sig += "content-length: " + contentLength + "" + nl
break
}
}
if s.KeyId != actor.PublicKey.Id {
return false
}
t, _ := time.Parse(time.RFC1123, date)
if time.Now().UTC().Sub(t).Seconds() > 75 {
return false
}
if ActivityVerify(actor, s.Signature, sig) != nil {
return false
}
return true
}
func ActivityVerify(actor activitypub.Actor, signature string, verify string) error {
sig, _ := base64.StdEncoding.DecodeString(signature)
if actor.PublicKey.PublicKeyPem == "" {
_actor, err := webfinger.FingerActor(actor.Id)
if err != nil {
return err
}
actor = _actor
}
block, _ := pem.Decode([]byte(actor.PublicKey.PublicKeyPem))
pub, _ := x509.ParsePKIXPublicKey(block.Bytes)
hashed := sha256.New()
hashed.Write([]byte(verify))
return rsa.VerifyPKCS1v15(pub.(*rsa.PublicKey), crypto.SHA256, hashed.Sum(nil), sig)
}
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