package auth import ( "context" "fmt" "net/http" "net/url" "strings" goauth "github.com/abbot/go-http-auth" "github.com/traefik/traefik/v3/pkg/config/dynamic" "github.com/traefik/traefik/v3/pkg/middlewares" "github.com/traefik/traefik/v3/pkg/middlewares/accesslog" "github.com/traefik/traefik/v3/pkg/tracing" "go.opentelemetry.io/otel/trace" ) const ( typeNameBasic = "BasicAuth" ) type basicAuth struct { next http.Handler auth *goauth.BasicAuth users map[string]string headerField string removeHeader bool name string } // NewBasic creates a basicAuth middleware. func NewBasic(ctx context.Context, next http.Handler, authConfig dynamic.BasicAuth, name string) (http.Handler, error) { middlewares.GetLogger(ctx, name, typeNameBasic).Debug().Msg("Creating middleware") users, err := getUsers(authConfig.UsersFile, authConfig.Users, basicUserParser) if err != nil { return nil, err } ba := &basicAuth{ next: next, users: users, headerField: authConfig.HeaderField, removeHeader: authConfig.RemoveHeader, name: name, } realm := defaultRealm if len(authConfig.Realm) > 0 { realm = authConfig.Realm } ba.auth = &goauth.BasicAuth{Realm: realm, Secrets: ba.secretBasic} return ba, nil } func (b *basicAuth) GetTracingInformation() (string, string, trace.SpanKind) { return b.name, typeNameBasic, trace.SpanKindInternal } func (b *basicAuth) ServeHTTP(rw http.ResponseWriter, req *http.Request) { logger := middlewares.GetLogger(req.Context(), b.name, typeNameBasic) user, password, ok := req.BasicAuth() if ok { secret := b.auth.Secrets(user, b.auth.Realm) if secret == "" || !goauth.CheckSecret(password, secret) { ok = false } } logData := accesslog.GetLogData(req) if logData != nil { logData.Core[accesslog.ClientUsername] = user } if !ok { logger.Debug().Msg("Authentication failed") tracing.SetStatusErrorf(req.Context(), "Authentication failed") b.auth.RequireAuth(rw, req) return } logger.Debug().Msg("Authentication succeeded") req.URL.User = url.User(user) if b.headerField != "" { req.Header[b.headerField] = []string{user} } if b.removeHeader { logger.Debug().Msg("Removing authorization header") req.Header.Del(authorizationHeader) } b.next.ServeHTTP(rw, req) } func (b *basicAuth) secretBasic(user, realm string) string { if secret, ok := b.users[user]; ok { return secret } return "" } func basicUserParser(user string) (string, string, error) { split := strings.Split(user, ":") if len(split) != 2 { return "", "", fmt.Errorf("error parsing BasicUser: %v", user) } return split[0], split[1], nil }