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https://github.com/gogrlx/nats-server.git
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51ea92d7c7
The nonce feature is useful to custom authentication plugins but at present there is no way to enable a nonce to be presented other than by setting nkey accounts etc. This enables the nonce to always be presented in those situations. Since its primarily useful to embedded scenarios there is no corresponding configuration file behavior for this flag. Signed-off-by: R.I.Pienaar <rip@devco.net>
47 lines
1.3 KiB
Go
47 lines
1.3 KiB
Go
// Copyright 2018 The NATS Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package server
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import (
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"encoding/base64"
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)
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// Raw length of the nonce challenge
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const (
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nonceRawLen = 11
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nonceLen = 15 // base64.RawURLEncoding.EncodedLen(nonceRawLen)
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)
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// NonceRequired tells us if we should send a nonce.
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func (s *Server) NonceRequired() bool {
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s.mu.Lock()
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defer s.mu.Unlock()
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return s.nonceRequired()
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}
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// nonceRequired tells us if we should send a nonce.
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// Lock should be held on entry.
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func (s *Server) nonceRequired() bool {
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return s.opts.AlwaysEnableNonce || len(s.nkeys) > 0 || s.trustedKeys != nil
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}
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// Generate a nonce for INFO challenge.
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// Assumes server lock is held
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func (s *Server) generateNonce(n []byte) {
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var raw [nonceRawLen]byte
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data := raw[:]
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s.prand.Read(data)
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base64.RawURLEncoding.Encode(n, data)
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}
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