diff options
Diffstat (limited to 'Emby.Server.Implementations/Plugins/PluginManager.cs')
| -rw-r--r-- | Emby.Server.Implementations/Plugins/PluginManager.cs | 147 |
1 files changed, 142 insertions, 5 deletions
diff --git a/Emby.Server.Implementations/Plugins/PluginManager.cs b/Emby.Server.Implementations/Plugins/PluginManager.cs index f14f87ccd..48584ae0c 100644 --- a/Emby.Server.Implementations/Plugins/PluginManager.cs +++ b/Emby.Server.Implementations/Plugins/PluginManager.cs @@ -1,5 +1,6 @@ using System; using System.Collections.Generic; +using System.Data; using System.Globalization; using System.IO; using System.Linq; @@ -9,6 +10,8 @@ using System.Runtime.Loader; using System.Text; using System.Text.Json; using System.Threading.Tasks; +using Emby.Server.Implementations.Library; +using Jellyfin.Extensions; using Jellyfin.Extensions.Json; using Jellyfin.Extensions.Json.Converters; using MediaBrowser.Common; @@ -29,6 +32,8 @@ namespace Emby.Server.Implementations.Plugins /// </summary> public class PluginManager : IPluginManager { + private const string MetafileName = "meta.json"; + private readonly string _pluginsPath; private readonly Version _appVersion; private readonly List<AssemblyLoadContext> _assemblyLoadContexts; @@ -44,7 +49,7 @@ namespace Emby.Server.Implementations.Plugins /// <summary> /// Initializes a new instance of the <see cref="PluginManager"/> class. /// </summary> - /// <param name="logger">The <see cref="ILogger"/>.</param> + /// <param name="logger">The <see cref="ILogger{PluginManager}"/>.</param> /// <param name="appHost">The <see cref="IApplicationHost"/>.</param> /// <param name="config">The <see cref="ServerConfiguration"/>.</param> /// <param name="pluginsPath">The plugin path.</param> @@ -371,7 +376,7 @@ namespace Emby.Server.Implementations.Plugins try { var data = JsonSerializer.Serialize(manifest, _jsonOptions); - File.WriteAllText(Path.Combine(path, "meta.json"), data); + File.WriteAllText(Path.Combine(path, MetafileName), data); return true; } catch (ArgumentException e) @@ -382,7 +387,7 @@ namespace Emby.Server.Implementations.Plugins } /// <inheritdoc/> - public async Task<bool> GenerateManifest(PackageInfo packageInfo, Version version, string path, PluginStatus status) + public async Task<bool> PopulateManifest(PackageInfo packageInfo, Version version, string path, PluginStatus status) { var versionInfo = packageInfo.Versions.First(v => v.Version == version.ToString()); var imagePath = string.Empty; @@ -427,10 +432,72 @@ namespace Emby.Server.Implementations.Plugins ImagePath = imagePath }; + if (!await ReconcileManifest(manifest, path)) + { + // An error occurred during reconciliation and saving could be undesirable. + return false; + } + return SaveManifest(manifest, path); } /// <summary> + /// Reconciles the manifest against any properties that exist locally in a pre-packaged meta.json found at the path. + /// If no file is found, no reconciliation occurs. + /// </summary> + /// <param name="manifest">The <see cref="PluginManifest"/> to reconcile against.</param> + /// <param name="path">The plugin path.</param> + /// <returns>The reconciled <see cref="PluginManifest"/>.</returns> + private async Task<bool> ReconcileManifest(PluginManifest manifest, string path) + { + try + { + var metafile = Path.Combine(path, MetafileName); + if (!File.Exists(metafile)) + { + _logger.LogInformation("No local manifest exists for plugin {Plugin}. Skipping manifest reconciliation.", manifest.Name); + return true; + } + + using var metaStream = File.OpenRead(metafile); + var localManifest = await JsonSerializer.DeserializeAsync<PluginManifest>(metaStream, _jsonOptions); + localManifest ??= new PluginManifest(); + + if (!Equals(localManifest.Id, manifest.Id)) + { + _logger.LogError("The manifest ID {LocalUUID} did not match the package info ID {PackageUUID}.", localManifest.Id, manifest.Id); + manifest.Status = PluginStatus.Malfunctioned; + } + + if (localManifest.Version != manifest.Version) + { + // Package information provides the version and is the source of truth. Pre-packages meta.json is assumed to be a mistake in this regard. + _logger.LogWarning("The version of the local manifest was {LocalVersion}, but {PackageVersion} was expected. The value will be replaced.", localManifest.Version, manifest.Version); + } + + // Explicitly mapping properties instead of using reflection is preferred here. + manifest.Category = string.IsNullOrEmpty(localManifest.Category) ? manifest.Category : localManifest.Category; + manifest.AutoUpdate = localManifest.AutoUpdate; // Preserve whatever is local. Package info does not have this property. + manifest.Changelog = string.IsNullOrEmpty(localManifest.Changelog) ? manifest.Changelog : localManifest.Changelog; + manifest.Description = string.IsNullOrEmpty(localManifest.Description) ? manifest.Description : localManifest.Description; + manifest.Name = string.IsNullOrEmpty(localManifest.Name) ? manifest.Name : localManifest.Name; + manifest.Overview = string.IsNullOrEmpty(localManifest.Overview) ? manifest.Overview : localManifest.Overview; + manifest.Owner = string.IsNullOrEmpty(localManifest.Owner) ? manifest.Owner : localManifest.Owner; + manifest.TargetAbi = string.IsNullOrEmpty(localManifest.TargetAbi) ? manifest.TargetAbi : localManifest.TargetAbi; + manifest.Timestamp = localManifest.Timestamp.Equals(default) ? manifest.Timestamp : localManifest.Timestamp; + manifest.ImagePath = string.IsNullOrEmpty(localManifest.ImagePath) ? manifest.ImagePath : localManifest.ImagePath; + manifest.Assemblies = localManifest.Assemblies; + + return true; + } + catch (Exception e) + { + _logger.LogWarning(e, "Unable to reconcile plugin manifest due to an error. {Path}", path); + return false; + } + } + + /// <summary> /// Changes a plugin's load status. /// </summary> /// <param name="plugin">The <see cref="LocalPlugin"/> instance.</param> @@ -594,7 +661,7 @@ namespace Emby.Server.Implementations.Plugins { Version? version; PluginManifest? manifest = null; - var metafile = Path.Combine(dir, "meta.json"); + var metafile = Path.Combine(dir, MetafileName); if (File.Exists(metafile)) { // Only path where this stays null is when File.ReadAllBytes throws an IOException @@ -688,7 +755,15 @@ namespace Emby.Server.Implementations.Plugins var entry = versions[x]; if (!string.Equals(lastName, entry.Name, StringComparison.OrdinalIgnoreCase)) { - entry.DllFiles = Directory.GetFiles(entry.Path, "*.dll", SearchOption.AllDirectories); + if (!TryGetPluginDlls(entry, out var allowedDlls)) + { + _logger.LogError("One or more assembly paths was invalid. Marking plugin {Plugin} as \"Malfunctioned\".", entry.Name); + ChangePluginState(entry, PluginStatus.Malfunctioned); + continue; + } + + entry.DllFiles = allowedDlls; + if (entry.IsEnabledAndSupported) { lastName = entry.Name; @@ -735,6 +810,68 @@ namespace Emby.Server.Implementations.Plugins } /// <summary> + /// Attempts to retrieve valid DLLs from the plugin path. This method will consider the assembly whitelist + /// from the manifest. + /// </summary> + /// <remarks> + /// Loading DLLs from externally supplied paths introduces a path traversal risk. This method + /// uses a safelisting tactic of considering DLLs from the plugin directory and only using + /// the plugin's canonicalized assembly whitelist for comparison. See + /// <see href="https://owasp.org/www-community/attacks/Path_Traversal"/> for more details. + /// </remarks> + /// <param name="plugin">The plugin.</param> + /// <param name="whitelistedDlls">The whitelisted DLLs. If the method returns <see langword="false"/>, this will be empty.</param> + /// <returns> + /// <see langword="true"/> if all assemblies listed in the manifest were available in the plugin directory. + /// <see langword="false"/> if any assemblies were invalid or missing from the plugin directory. + /// </returns> + /// <exception cref="ArgumentNullException">If the <see cref="LocalPlugin"/> is null.</exception> + private bool TryGetPluginDlls(LocalPlugin plugin, out IReadOnlyList<string> whitelistedDlls) + { + ArgumentNullException.ThrowIfNull(nameof(plugin)); + + IReadOnlyList<string> pluginDlls = Directory.GetFiles(plugin.Path, "*.dll", SearchOption.AllDirectories); + + whitelistedDlls = Array.Empty<string>(); + if (pluginDlls.Count > 0 && plugin.Manifest.Assemblies.Count > 0) + { + _logger.LogInformation("Registering whitelisted assemblies for plugin \"{Plugin}\"...", plugin.Name); + + var canonicalizedPaths = new List<string>(); + foreach (var path in plugin.Manifest.Assemblies) + { + var canonicalized = Path.Combine(plugin.Path, path).Canonicalize(); + + // Ensure we stay in the plugin directory. + if (!canonicalized.StartsWith(plugin.Path.NormalizePath(), StringComparison.Ordinal)) + { + _logger.LogError("Assembly path {Path} is not inside the plugin directory.", path); + return false; + } + + canonicalizedPaths.Add(canonicalized); + } + + var intersected = pluginDlls.Intersect(canonicalizedPaths).ToList(); + + if (intersected.Count != canonicalizedPaths.Count) + { + _logger.LogError("Plugin {Plugin} contained assembly paths that were not found in the directory.", plugin.Name); + return false; + } + + whitelistedDlls = intersected; + } + else + { + // No whitelist, default to loading all DLLs in plugin directory. + whitelistedDlls = pluginDlls; + } + + return true; + } + + /// <summary> /// Changes the status of the other versions of the plugin to "Superceded". /// </summary> /// <param name="plugin">The <see cref="LocalPlugin"/> that's master.</param> |