Remove legacy auth code (#1677)

* Remove legacy auth code

* Adds tests so we don't break PasswordHash (again)
* Clean up interfaces
* Remove duplicate code

* Use auto properties

* static using

* Don't use 'this'

* Fix build

5 files changed, 215 insertions, 1 deletions

diff --git a/MediaBrowser.Common/Cryptography/Constants.cs b/MediaBrowser.Common/Cryptography/Constants.cs
new file mode 100644
index 000000000..354114232
--- /dev/null
+++ b/MediaBrowser.Common/Cryptography/Constants.cs
@@ -0,0 +1,18 @@
+namespace MediaBrowser.Common.Cryptography
+{
+    /// <summary>
+    /// Class containing global constants for Jellyfin Cryptography.
+    /// </summary>
+    public static class Constants
+    {
+        /// <summary>
+        /// The default length for new salts.
+        /// </summary>
+        public const int DefaultSaltLength = 64;
+
+        /// <summary>
+        /// The default amount of iterations for hashing passwords.
+        /// </summary>
+        public const int DefaultIterations = 1000;
+    }
+}
diff --git a/MediaBrowser.Common/Cryptography/Extensions.cs b/MediaBrowser.Common/Cryptography/Extensions.cs
new file mode 100644
index 000000000..1e32a6d1a
--- /dev/null
+++ b/MediaBrowser.Common/Cryptography/Extensions.cs
@@ -0,0 +1,35 @@
+using System.Collections.Generic;
+using System.Globalization;
+using System.Text;
+using MediaBrowser.Model.Cryptography;
+using static MediaBrowser.Common.Cryptography.Constants;
+
+namespace MediaBrowser.Common.Cryptography
+{
+    /// <summary>
+    /// Class containing extension methods for working with Jellyfin cryptography objects.
+    /// </summary>
+    public static class Extensions
+    {
+        /// <summary>
+        /// Creates a new <see cref="PasswordHash" /> instance.
+        /// </summary>
+        /// <param name="cryptoProvider">The <see cref="ICryptoProvider" /> instance used.</param>
+        /// <param name="password">The password that will be hashed.</param>
+        /// <returns>A <see cref="PasswordHash" /> instance with the hash method, hash, salt and number of iterations.</returns>
+        public static PasswordHash CreatePasswordHash(this ICryptoProvider cryptoProvider, string password)
+        {
+            byte[] salt = cryptoProvider.GenerateSalt();
+            return new PasswordHash(
+                cryptoProvider.DefaultHashMethod,
+                cryptoProvider.ComputeHashWithDefaultMethod(
+                    Encoding.UTF8.GetBytes(password),
+                    salt),
+                salt,
+                new Dictionary<string, string>
+                {
+                    { "iterations", DefaultIterations.ToString(CultureInfo.InvariantCulture) }
+                });
+        }
+    }
+}
diff --git a/MediaBrowser.Common/Cryptography/PasswordHash.cs b/MediaBrowser.Common/Cryptography/PasswordHash.cs
new file mode 100644
index 000000000..5b28d344f
--- /dev/null
+++ b/MediaBrowser.Common/Cryptography/PasswordHash.cs
@@ -0,0 +1,155 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+using static MediaBrowser.Common.HexHelper;
+
+namespace MediaBrowser.Common.Cryptography
+{
+    // Defined from this hash storage spec
+    // https://github.com/P-H-C/phc-string-format/blob/master/phc-sf-spec.md
+    // $<id>[$<param>=<value>(,<param>=<value>)*][$<salt>[$<hash>]]
+    // with one slight amendment to ease the transition, we're writing out the bytes in hex
+    // rather than making them a BASE64 string with stripped padding
+    public class PasswordHash
+    {
+        private readonly Dictionary<string, string> _parameters;
+
+        public PasswordHash(string id, byte[] hash)
+            : this(id, hash, Array.Empty<byte>())
+        {
+
+        }
+
+        public PasswordHash(string id, byte[] hash, byte[] salt)
+            : this(id, hash, salt, new Dictionary<string, string>())
+        {
+
+        }
+
+        public PasswordHash(string id, byte[] hash, byte[] salt, Dictionary<string, string> parameters)
+        {
+            Id = id;
+            Hash = hash;
+            Salt = salt;
+            _parameters = parameters;
+        }
+
+        /// <summary>
+        /// Gets the symbolic name for the function used.
+        /// </summary>
+        /// <value>Returns the symbolic name for the function used.</value>
+        public string Id { get; }
+
+        /// <summary>
+        /// Gets the additional parameters used by the hash function.
+        /// </summary>
+        /// <value></value>
+        public IReadOnlyDictionary<string, string> Parameters => _parameters;
+
+        /// <summary>
+        /// Gets the salt used for hashing the password.
+        /// </summary>
+        /// <value>Returns the salt used for hashing the password.</value>
+        public byte[] Salt { get; }
+
+        /// <summary>
+        /// Gets the hashed password.
+        /// </summary>
+        /// <value>Return the hashed password.</value>
+        public byte[] Hash { get; }
+
+        public static PasswordHash Parse(string storageString)
+        {
+            string[] splitted = storageString.Split('$');
+            // The string should at least contain the hash function and the hash itself
+            if (splitted.Length < 3)
+            {
+                throw new ArgumentException("String doesn't contain enough segments", nameof(storageString));
+            }
+
+            // Start at 1, the first index shouldn't contain any data
+            int index = 1;
+
+            // Name of the hash function
+            string id = splitted[index++];
+
+            // Optional parameters
+            Dictionary<string, string> parameters = new Dictionary<string, string>();
+            if (splitted[index].IndexOf('=') != -1)
+            {
+                foreach (string paramset in splitted[index++].Split(','))
+                {
+                    if (string.IsNullOrEmpty(paramset))
+                    {
+                        continue;
+                    }
+
+                    string[] fields = paramset.Split('=');
+                    if (fields.Length != 2)
+                    {
+                        throw new InvalidDataException($"Malformed parameter in password hash string {paramset}");
+                    }
+
+                    parameters.Add(fields[0], fields[1]);
+                }
+            }
+
+            byte[] hash;
+            byte[] salt;
+            // Check if the string also contains a salt
+            if (splitted.Length - index == 2)
+            {
+                salt = FromHexString(splitted[index++]);
+                hash = FromHexString(splitted[index++]);
+            }
+            else
+            {
+                salt = Array.Empty<byte>();
+                hash = FromHexString(splitted[index++]);
+            }
+
+            return new PasswordHash(id, hash, salt, parameters);
+        }
+
+        private void SerializeParameters(StringBuilder stringBuilder)
+        {
+            if (_parameters.Count == 0)
+            {
+                return;
+            }
+
+            stringBuilder.Append('$');
+            foreach (var pair in _parameters)
+            {
+                stringBuilder.Append(pair.Key);
+                stringBuilder.Append('=');
+                stringBuilder.Append(pair.Value);
+                stringBuilder.Append(',');
+            }
+
+            // Remove last ','
+            stringBuilder.Length -= 1;
+        }
+
+        /// <inheritdoc />
+        public override string ToString()
+        {
+            var str = new StringBuilder();
+            str.Append('$');
+            str.Append(Id);
+            SerializeParameters(str);
+
+            if (Salt.Length != 0)
+            {
+                str.Append('$');
+                str.Append(ToHexString(Salt));
+            }
+
+            str.Append('$');
+            str.Append(ToHexString(Hash));
+
+            return str.ToString();
+        }
+    }
+}
diff --git a/MediaBrowser.Common/Extensions/HexHelper.cs b/MediaBrowser.Common/HexHelper.cs
index 3d80d94ac..5587c03fd 100644
--- a/MediaBrowser.Common/Extensions/HexHelper.cs
+++ b/MediaBrowser.Common/HexHelper.cs
@@ -1,7 +1,7 @@
 using System;
 using System.Globalization;
 
-namespace MediaBrowser.Common.Extensions
+namespace MediaBrowser.Common
 {
     public static class HexHelper
     {
diff --git a/MediaBrowser.Common/MediaBrowser.Common.csproj b/MediaBrowser.Common/MediaBrowser.Common.csproj
index 91ab066f9..1a40f5ea2 100644
--- a/MediaBrowser.Common/MediaBrowser.Common.csproj
+++ b/MediaBrowser.Common/MediaBrowser.Common.csproj
@@ -31,4 +31,10 @@
     <LangVersion>latest</LangVersion>
   </PropertyGroup>
 
+  <ItemGroup>
+    <AssemblyAttribute Include="System.Runtime.CompilerServices.InternalsVisibleTo">
+      <_Parameter1>Jellyfin.Common.Tests</_Parameter1>
+    </AssemblyAttribute>
+  </ItemGroup>
+
 </Project>