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ScramSha1Authenticator.cs
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ScramSha1Authenticator.cs
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/* Copyright 2015-present MongoDB Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using System.Security.Cryptography;
using System.Text;
using MongoDB.Driver.Core.Misc;
// Use our vendored version of Rfc2898DeriveBytes for .NET Standard 2.0
// because this target does not support a version of Rfc2898DeriveBytes that allows to specify the hash algorithm
#if NETSTANDARD2_0
using Rfc2898DeriveBytes = MongoDB.Driver.Core.Authentication.Vendored.Rfc2898DeriveBytes;
#else
using Rfc2898DeriveBytes = System.Security.Cryptography.Rfc2898DeriveBytes;
#endif
namespace MongoDB.Driver.Core.Authentication
{
/// <summary>
/// A SCRAM-SHA1 SASL authenticator.
/// </summary>
public sealed class ScramSha1Authenticator : ScramShaAuthenticator
{
// static properties
/// <summary>
/// Gets the name of the mechanism.
/// </summary>
/// <value>
/// The name of the mechanism.
/// </value>
public static string MechanismName => "SCRAM-SHA-1";
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="ScramSha1Authenticator"/> class.
/// </summary>
/// <param name="credential">The credential.</param>
[Obsolete("Use the newest overload instead.")]
public ScramSha1Authenticator(UsernamePasswordCredential credential)
: this(credential, serverApi: null)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="ScramSha1Authenticator"/> class.
/// </summary>
/// <param name="credential">The credential.</param>
/// <param name="serverApi">The server API.</param>
public ScramSha1Authenticator(UsernamePasswordCredential credential, ServerApi serverApi)
: this(credential, new DefaultRandomStringGenerator(), serverApi)
{
}
internal ScramSha1Authenticator(
UsernamePasswordCredential credential,
IRandomStringGenerator randomStringGenerator,
ServerApi serverApi)
: base(credential, HashAlgorithmName.SHA1, randomStringGenerator, H1, Hi1, Hmac1, new ScramCache(), serverApi)
{
}
private static byte[] H1(byte[] data)
{
using (var sha1 = SHA1.Create())
{
return sha1.ComputeHash(data);
}
}
private static byte[] Hi1(UsernamePasswordCredential credential, byte[] salt, int iterations)
{
var passwordDigest = AuthenticationHelper.MongoPasswordDigest(credential.Username, credential.Password);
using (var deriveBytes = new Rfc2898DeriveBytes(passwordDigest, salt, iterations, HashAlgorithmName.SHA1))
{
// 20 is the length of output of a sha-1 hmac
return deriveBytes.GetBytes(20);
}
}
private static byte[] Hmac1(UTF8Encoding encoding, byte[] data, string key)
{
using (var hmac = new HMACSHA1(data, useManagedSha1: true))
{
return hmac.ComputeHash(encoding.GetBytes(key));
}
}
}
}