alice.pds.demo.boltless.dev
This repository has no description
implement two-way signature verification
author
Akshay
date
(Jan 31, 2025, 1:51 PM UTC)
commit
df542a02
df542a029ba2ff40f5b4af23441bfd462c0b8281
parent
3d4f9f0f
3d4f9f0f4abe1f42c13863705fb0bc08fd796e70
+62
-18
+4
-2
appview/db/db.go
+4
-2
appview/db/db.go
+45
-12
appview/state/state.go
+45
-12
appview/state/state.go
···
4
4
"crypto/hmac"
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5
"crypto/sha256"
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"encoding/hex"
7
+
"fmt"
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"log"
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9
"net/http"
9
-
"net/url"
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"time"
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"github.com/go-chi/chi/v5"
···
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// check if domain is valid url, and strip extra bits down to just host
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domain := r.FormValue("domain")
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-
url, err := url.Parse(domain)
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if domain == "" || err != nil {
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+
log.Println(err)
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http.Error(w, "Invalid form", http.StatusBadRequest)
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return
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}
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-
key, err := s.Db.GenerateRegistrationKey(url.Host, did)
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+
key, err := s.Db.GenerateRegistrationKey(domain, did)
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if err != nil {
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log.Println(err)
···
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return
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}
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+
log.Println("checking ", domain)
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+
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secret, err := s.Db.GetRegistrationKey(domain)
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if err != nil {
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log.Printf("no key found for domain %s: %s\n", domain, err)
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return
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}
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-
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-
hmac := hmac.New(sha256.New, []byte(secret))
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-
signature := hex.EncodeToString(hmac.Sum(nil))
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+
log.Println("has secret ", secret)
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// make a request do the knotserver with an empty body and above signature
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-
url, _ := url.Parse(domain)
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-
url = url.JoinPath("check")
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-
pingRequest, err := http.NewRequest("GET", url.String(), nil)
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+
url := fmt.Sprintf("http://%s/internal/health", domain)
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+
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+
pingRequest, err := buildPingRequest(url, secret)
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if err != nil {
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-
log.Println("failed to create ping request for ", url.String())
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log.Println("failed to build ping request", err)
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return
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}
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-
pingRequest.Header.Set("X-Signature", signature)
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client := &http.Client{
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Timeout: 5 * time.Second,
···
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}
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if resp.StatusCode != http.StatusOK {
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-
log.Println("status nok")
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+
log.Println("status nok", resp.StatusCode)
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w.Write([]byte("no dice"))
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return
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}
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+
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+
// verify response mac
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+
signature := resp.Header.Get("X-Signature")
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+
signatureBytes, err := hex.DecodeString(signature)
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+
if err != nil {
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+
return
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+
}
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+
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+
expectedMac := hmac.New(sha256.New, []byte(secret))
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+
expectedMac.Write([]byte("ok"))
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+
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+
if !hmac.Equal(expectedMac.Sum(nil), signatureBytes) {
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+
log.Printf("response body signature mismatch: %x\n", signatureBytes)
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+
return
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+
}
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+
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w.Write([]byte("check success"))
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// mark as registered
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s.Db.Register(domain)
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return
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+
}
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+
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+
func buildPingRequest(url, secret string) (*http.Request, error) {
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+
pingRequest, err := http.NewRequest("GET", url, nil)
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+
if err != nil {
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+
return nil, err
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+
}
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+
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+
timestamp := time.Now().Format(time.RFC3339)
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+
mac := hmac.New(sha256.New, []byte(secret))
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+
message := pingRequest.Method + pingRequest.URL.Path + timestamp
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+
mac.Write([]byte(message))
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+
signature := hex.EncodeToString(mac.Sum(nil))
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+
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pingRequest.Header.Set("X-Signature", signature)
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+
pingRequest.Header.Set("X-Timestamp", timestamp)
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+
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return pingRequest, nil
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}
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func (s *State) Router() http.Handler {
+3
-4
cmd/knotserver/main.go
+3
-4
cmd/knotserver/main.go
···
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7
"log/slog"
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8
"net/http"
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9
"os"
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-
"os/signal"
11
-
"syscall"
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10
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"github.com/icyphox/bild/knotserver"
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"github.com/icyphox/bild/knotserver/config"
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)
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func main() {
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-
ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
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-
defer stop()
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+
ctx := context.Background()
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+
// ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
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+
// defer stop()
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slog.SetDefault(slog.New(slog.NewTextHandler(os.Stdout, nil)))
22
21
+2
knotserver/middleware.go
+2
knotserver/middleware.go
···
4
4
"crypto/hmac"
5
5
"crypto/sha256"
6
6
"encoding/hex"
7
+
"log"
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8
"net/http"
8
9
"time"
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)
···
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func (h *Handle) VerifySignature(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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signature := r.Header.Get("X-Signature")
15
+
log.Println(signature)
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if signature == "" || !h.verifyHMAC(signature, r) {
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writeError(w, "signature verification failed", http.StatusForbidden)
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return
+8
knotserver/routes.go
+8
knotserver/routes.go
···
2
2
3
3
import (
4
4
"compress/gzip"
5
+
"crypto/hmac"
6
+
"crypto/sha256"
7
+
"encoding/hex"
5
8
"encoding/json"
6
9
"errors"
7
10
"fmt"
···
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// }
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func (h *Handle) Health(w http.ResponseWriter, r *http.Request) {
410
+
log.Println("got health check")
411
+
mac := hmac.New(sha256.New, []byte(h.c.Secret))
412
+
mac.Write([]byte("ok"))
413
+
w.Header().Add("X-Signature", hex.EncodeToString(mac.Sum(nil)))
414
+
407
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w.Write([]byte("ok"))
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416
}