158 lines
3.6 KiB
Go
158 lines
3.6 KiB
Go
package server
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import (
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"bytes"
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"context"
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"crypto/sha256"
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"errors"
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"io/ioutil"
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"strings"
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"time"
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"forge.cadoles.com/wpetit/go-http-peering/crypto"
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peering "forge.cadoles.com/wpetit/go-http-peering"
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jwt "github.com/dgrijalva/jwt-go"
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"net/http"
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)
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const (
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AuthorizationType = "Bearer"
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KeyPeerID ContextKey = "peerID"
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)
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var (
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ErrInvalidClaims = errors.New("invalid claims")
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ErrInvalidChecksum = errors.New("invalid checksum")
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ErrNotPeered = errors.New("not peered")
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)
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type ContextKey string
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func Authenticate(store peering.Store, funcs ...OptionFunc) func(http.Handler) http.Handler {
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options := createOptions(funcs...)
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logger := options.Logger
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middleware := func(next http.Handler) http.Handler {
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fn := func(w http.ResponseWriter, r *http.Request) {
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authorization := r.Header.Get("Authorization")
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if authorization == "" {
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sendError(w, http.StatusUnauthorized)
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return
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}
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parts := strings.SplitN(authorization, " ", 2)
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if len(parts) != 2 || parts[0] != AuthorizationType {
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sendError(w, http.StatusUnauthorized)
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return
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}
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token, err := jwt.ParseWithClaims(parts[1], &peering.PeerClaims{}, func(token *jwt.Token) (interface{}, error) {
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claims, ok := token.Claims.(*peering.PeerClaims)
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if !ok {
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return nil, ErrInvalidClaims
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}
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peerID := peering.PeerID(claims.Issuer)
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peer, err := store.Get(peerID)
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if err != nil {
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return nil, err
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}
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if peer.Status == peering.StatusRejected {
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return nil, ErrPeerRejected
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}
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if peer.Status != peering.StatusPeered {
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return nil, ErrNotPeered
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}
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publicKey, err := crypto.DecodePEMToPublicKey(peer.PublicKey)
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if err != nil {
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return nil, err
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}
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return publicKey, nil
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})
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if err != nil || !token.Valid {
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logger.Printf("[ERROR] %s", err)
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if err == ErrPeerRejected {
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sendError(w, http.StatusForbidden)
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} else {
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sendError(w, http.StatusUnauthorized)
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}
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return
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}
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claims, ok := token.Claims.(*peering.PeerClaims)
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if !ok {
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logger.Printf("[ERROR] %s", ErrInvalidClaims)
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sendError(w, http.StatusUnauthorized)
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return
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}
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body, err := ioutil.ReadAll(r.Body)
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if err != nil {
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logger.Printf("[ERROR] %s", err)
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sendError(w, http.StatusInternalServerError)
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return
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}
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if err := r.Body.Close(); err != nil {
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logger.Printf("[ERROR] %s", err)
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sendError(w, http.StatusInternalServerError)
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return
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}
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match, err := compareChecksum(body, claims.BodySum)
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if err != nil {
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logger.Printf("[ERROR] %s", err)
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sendError(w, http.StatusUnauthorized)
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return
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}
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if !match {
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logger.Printf("[ERROR] %s", ErrInvalidChecksum)
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sendError(w, http.StatusBadRequest)
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return
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}
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peerID := peering.PeerID(claims.Issuer)
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if err := store.UpdateLastContact(peerID, r.RemoteAddr, time.Now()); err != nil {
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logger.Printf("[ERROR] %s", err)
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sendError(w, http.StatusInternalServerError)
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return
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}
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ctx := context.WithValue(r.Context(), KeyPeerID, peerID)
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r = r.WithContext(ctx)
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r.Body = ioutil.NopCloser(bytes.NewBuffer(body))
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next.ServeHTTP(w, r)
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}
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return http.HandlerFunc(fn)
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}
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return middleware
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}
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func GetPeerID(r *http.Request) (peering.PeerID, error) {
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peerID, ok := r.Context().Value(KeyPeerID).(peering.PeerID)
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if !ok {
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return "", ErrUnauthorized
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}
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return peerID, nil
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}
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func sendError(w http.ResponseWriter, status int) {
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http.Error(w, http.StatusText(status), status)
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}
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func compareChecksum(body []byte, sum []byte) (bool, error) {
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sha := sha256.New()
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_, err := sha.Write(body)
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if err != nil {
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return false, err
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}
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return bytes.Equal(sum, sha.Sum(nil)), nil
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}
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