/// <inheritdoc />
public void CacheSystemIdentity(User user, ISystemIdentity systemIdentity, DateTimeOffset expiry)
{
if (user == null)
{
throw new ArgumentNullException(nameof(user));
}
if (systemIdentity == null)
{
throw new ArgumentNullException(nameof(systemIdentity));
}
lock (cachedIdentities)
{
var uid = systemIdentity.Uid;
logger.LogDebug("Caching system identity {0} of user {1}", uid, user.Id);
if (cachedIdentities.TryGetValue(user.Id.Value, out var identCache))
{
logger.LogTrace("Expiring previously cached identity...");
identCache.Dispose(); // also clears it out
}
identCache = new IdentityCacheObject(systemIdentity.Clone(), asyncDelayer, () =>
{
logger.LogDebug("Expiring system identity cache for user {1}", uid, user.Id);
lock (cachedIdentities)
cachedIdentities.Remove(user.Id.Value);
}, expiry);
cachedIdentities.Add(user.Id.Value, identCache);
}
}
/// <summary>
/// Construct an <see cref="IdentityCache"/>
/// </summary>
/// <param name="systemIdentity">The value of <see cref="SystemIdentity"/></param>
/// <param name="onExpiry">The <see cref="Action"/> to take on expiry</param>
/// <param name="expiry">The <see cref="DateTimeOffset"/></param>
public IdentityCacheObject(ISystemIdentity systemIdentity, Action onExpiry, DateTimeOffset expiry)
{
SystemIdentity = systemIdentity ?? throw new ArgumentNullException(nameof(systemIdentity));
if (onExpiry == null)
{
throw new ArgumentNullException(nameof(onExpiry));
}
var now = DateTimeOffset.Now;
if (expiry < now)
{
throw new ArgumentOutOfRangeException(nameof(expiry), expiry, "expiry must be greater than DateTimeOffset.Now!");
}
cancellationTokenSource = new CancellationTokenSource();
async Task DisposeOnExipiry(CancellationToken cancellationToken)
{
using (SystemIdentity)
try
{
await Task.Delay(expiry - now, cancellationToken).ConfigureAwait(false);
}
finally
{
onExpiry();
}
}
task = DisposeOnExipiry(cancellationTokenSource.Token);
}
/// <summary>
/// Construct an <see cref="AuthenticationContext"/>
/// </summary>
/// <param name="systemIdentity">The value of <see cref="SystemIdentity"/></param>
/// <param name="user">The value of <see cref="User"/></param>
/// <param name="instanceUser">The value of <see cref="InstanceUser"/></param>
public AuthenticationContext(ISystemIdentity systemIdentity, User user, InstanceUser instanceUser)
{
this.user = user ?? throw new ArgumentNullException(nameof(user));
if (systemIdentity == null && User.SystemIdentifier != null)
{
throw new ArgumentNullException(nameof(systemIdentity));
}
InstanceUser = instanceUser;
SystemIdentity = systemIdentity;
}
/// <summary>
/// If a <see cref="ForbidResult"/> should be returned from actions due to conflicts with one or both of the <see cref="Api.Models.Instance.ConfigurationType"/> or the <see cref="IAuthenticationContext.SystemIdentity"/> or a given <paramref name="path"/> tries to access parent directories
/// </summary>
/// <param name="path">The path to validate if any</param>
/// <param name="systemIdentityToUse">The <see cref="ISystemIdentity"/> to use when calling into <see cref="Components.StaticFiles.IConfiguration"/></param>
/// <returns><see langword="true"/> if a <see cref="ForbidResult"/> should be returned, <see langword="false"/> otherwise</returns>
bool ForbidDueToModeConflicts(string path, out ISystemIdentity systemIdentityToUse)
{
if (Instance.ConfigurationType == ConfigurationType.Disallowed || (Instance.ConfigurationType == ConfigurationType.SystemIdentityWrite && AuthenticationContext.SystemIdentity == null) || (path != null && ioManager.PathContainsParentAccess(path)))
{
systemIdentityToUse = null;
return(true);
}
systemIdentityToUse = Instance.ConfigurationType == ConfigurationType.SystemIdentityWrite ? AuthenticationContext.SystemIdentity : null;
return(false);
}
/// <summary>
/// Construct an <see cref="AuthenticationContext"/>
/// </summary>
/// <param name="systemIdentity">The value of <see cref="SystemIdentity"/></param>
/// <param name="user">The value of <see cref="User"/></param>
/// <param name="instanceUser">The value of <see cref="InstancePermissionSet"/></param>
public AuthenticationContext(ISystemIdentity systemIdentity, User user, InstancePermissionSet instanceUser)
{
User = user ?? throw new ArgumentNullException(nameof(user));
if (systemIdentity == null && User.SystemIdentifier != null)
{
throw new ArgumentNullException(nameof(systemIdentity));
}
PermissionSet = user.PermissionSet
?? user.Group.PermissionSet
?? throw new ArgumentException("No PermissionSet provider", nameof(user));
InstancePermissionSet = instanceUser;
SystemIdentity = systemIdentity;
}
/// <inheritdoc />
public async Task <bool> CreateDirectory(string configurationRelativePath, ISystemIdentity systemIdentity, CancellationToken cancellationToken)
{
await EnsureDirectories(cancellationToken).ConfigureAwait(false);
var path = ValidateConfigRelativePath(configurationRelativePath);
bool?result = null;
void DoCreate() => result = synchronousIOManager.CreateDirectory(path, cancellationToken);
if (systemIdentity == null)
{
await Task.Factory.StartNew(DoCreate, cancellationToken, TaskCreationOptions.LongRunning, TaskScheduler.Current).ConfigureAwait(false);
}
else
{
await systemIdentity.RunImpersonated(DoCreate, cancellationToken).ConfigureAwait(false);
}
return(result.Value);
}
/// <inheritdoc />
public async Task <bool> DeleteDirectory(string configurationRelativePath, ISystemIdentity systemIdentity, CancellationToken cancellationToken)
{
await EnsureDirectories(cancellationToken).ConfigureAwait(false);
var path = ValidateConfigRelativePath(configurationRelativePath);
var result = false;
using (await SemaphoreSlimContext.Lock(semaphore, cancellationToken).ConfigureAwait(false))
{
void CheckDeleteImpl() => result = synchronousIOManager.DeleteDirectory(path);
if (systemIdentity != null)
{
await systemIdentity.RunImpersonated(CheckDeleteImpl, cancellationToken).ConfigureAwait(false);
}
else
{
CheckDeleteImpl();
}
}
return(result);
}
/// <inheritdoc />
public void CacheSystemIdentity(User user, ISystemIdentity systemIdentity, DateTimeOffset expiry)
{
if (user == null)
{
throw new ArgumentNullException(nameof(user));
}
if (systemIdentity == null)
{
throw new ArgumentNullException(nameof(systemIdentity));
}
lock (cachedIdentities)
{
if (cachedIdentities.TryGetValue(user.Id, out var identCache))
{
identCache.Dispose(); //also clears it out
}
identCache = new IdentityCacheObject(systemIdentity.Clone(), () =>
{
lock (cachedIdentities)
cachedIdentities.Remove(user.Id);
}, expiry);
cachedIdentities.Add(user.Id, identCache);
}
}
/// <inheritdoc />
public async Task <ConfigurationFile> Write(string configurationRelativePath, ISystemIdentity systemIdentity, byte[] data, string previousHash, CancellationToken cancellationToken)
{
await EnsureDirectories(cancellationToken).ConfigureAwait(false);
var path = ValidateConfigRelativePath(configurationRelativePath);
ConfigurationFile result = null;
void WriteImpl()
{
lock (this)
try
{
var fileHash = previousHash;
var success = synchronousIOManager.WriteFileChecked(path, data, ref fileHash, cancellationToken);
if (!success)
{
return;
}
result = new ConfigurationFile
{
Content = data,
IsDirectory = false,
LastReadHash = fileHash,
AccessDenied = false,
Path = configurationRelativePath
};
}
catch (UnauthorizedAccessException)
{
//this happens on windows, dunno about linux
bool isDirectory;
try
{
isDirectory = synchronousIOManager.IsDirectory(path);
}
catch
{
isDirectory = false;
}
result = new ConfigurationFile
{
Path = configurationRelativePath
};
if (!isDirectory)
{
result.AccessDenied = true;
}
else
{
result.IsDirectory = true;
}
}
}
using (await SemaphoreSlimContext.Lock(semaphore, cancellationToken).ConfigureAwait(false))
if (systemIdentity == null)
{
await Task.Factory.StartNew(WriteImpl, cancellationToken, TaskCreationOptions.LongRunning, TaskScheduler.Current).ConfigureAwait(false);
}
else
{
await systemIdentity.RunImpersonated(WriteImpl, cancellationToken).ConfigureAwait(false);
}
return(result);
}
/// <inheritdoc />
public async Task <ConfigurationFile> Read(string configurationRelativePath, ISystemIdentity systemIdentity, CancellationToken cancellationToken)
{
await EnsureDirectories(cancellationToken).ConfigureAwait(false);
var path = ValidateConfigRelativePath(configurationRelativePath);
ConfigurationFile result = null;
void ReadImpl()
{
lock (this)
try
{
var content = synchronousIOManager.ReadFile(path);
string sha1String;
#pragma warning disable CA5350 // Do not use insecure cryptographic algorithm SHA1.
using (var sha1 = new SHA1Managed())
#pragma warning restore CA5350 // Do not use insecure cryptographic algorithm SHA1.
sha1String = String.Join("", sha1.ComputeHash(content).Select(b => b.ToString("x2", CultureInfo.InvariantCulture)));
result = new ConfigurationFile
{
Content = content,
IsDirectory = false,
LastReadHash = sha1String,
AccessDenied = false,
Path = configurationRelativePath
};
}
catch (UnauthorizedAccessException)
{
//this happens on windows, dunno about linux
bool isDirectory;
try
{
isDirectory = synchronousIOManager.IsDirectory(path);
}
catch
{
isDirectory = false;
}
result = new ConfigurationFile
{
Path = configurationRelativePath
};
if (!isDirectory)
{
result.AccessDenied = true;
}
else
{
result.IsDirectory = true;
}
}
}
using (await SemaphoreSlimContext.Lock(semaphore, cancellationToken).ConfigureAwait(false))
if (systemIdentity == null)
{
await Task.Factory.StartNew(ReadImpl, cancellationToken, TaskCreationOptions.LongRunning, TaskScheduler.Current).ConfigureAwait(false);
}
else
{
await systemIdentity.RunImpersonated(ReadImpl, cancellationToken).ConfigureAwait(false);
}
return(result);
}
/// <inheritdoc />
public async Task <IReadOnlyList <ConfigurationFile> > ListDirectory(string configurationRelativePath, ISystemIdentity systemIdentity, CancellationToken cancellationToken)
{
await EnsureDirectories(cancellationToken).ConfigureAwait(false);
var path = ValidateConfigRelativePath(configurationRelativePath);
if (configurationRelativePath == null)
{
configurationRelativePath = "/";
}
List <ConfigurationFile> result = new List <ConfigurationFile>();
void ListImpl()
{
var enumerator = synchronousIOManager.GetDirectories(path, cancellationToken);
try
{
result.AddRange(enumerator.Select(x => new ConfigurationFile
{
IsDirectory = true,
Path = ioManager.ConcatPath(configurationRelativePath, x),
}));
}
catch (IOException e)
{
logger.LogDebug("IOException while writing {0}: {1}", path, e);
result = null;
return;
}
enumerator = synchronousIOManager.GetFiles(path, cancellationToken);
result.AddRange(enumerator.Select(x => new ConfigurationFile
{
IsDirectory = false,
Path = ioManager.ConcatPath(configurationRelativePath, x),
}));
}
using (await SemaphoreSlimContext.Lock(semaphore, cancellationToken).ConfigureAwait(false))
if (systemIdentity == null)
{
ListImpl();
}
else
{
await systemIdentity.RunImpersonated(ListImpl, cancellationToken).ConfigureAwait(false);
}
return(result);
}
#pragma warning disable CA1506 // TODO: Decomplexify
public async Task <IActionResult> CreateToken(CancellationToken cancellationToken)
{
if (ApiHeaders == null)
{
Response.Headers.Add(HeaderNames.WWWAuthenticate, new StringValues("basic realm=\"Create TGS4 bearer token\""));
return(HeadersIssue(false));
}
if (ApiHeaders.IsTokenAuthentication)
{
return(BadRequest(new ErrorMessage(ErrorCode.TokenWithToken)));
}
var oAuthLogin = ApiHeaders.OAuthProvider.HasValue;
ISystemIdentity systemIdentity = null;
if (!oAuthLogin)
{
try
{
// trust the system over the database because a user's name can change while still having the same SID
systemIdentity = await systemIdentityFactory.CreateSystemIdentity(ApiHeaders.Username, ApiHeaders.Password, cancellationToken).ConfigureAwait(false);
}
catch (NotImplementedException ex)
{
Logger.LogTrace(ex, "System identities not implemented!");
}
}
using (systemIdentity)
{
// Get the user from the database
IQueryable <Models.User> query = DatabaseContext.Users.AsQueryable();
if (oAuthLogin)
{
string externalUserId;
try
{
var validator = oAuthProviders
.GetValidator(ApiHeaders.OAuthProvider.Value);
if (validator == null)
{
return(BadRequest(new ErrorMessage(ErrorCode.OAuthProviderDisabled)));
}
externalUserId = await validator
.ValidateResponseCode(ApiHeaders.Token, cancellationToken)
.ConfigureAwait(false);
}
catch (RateLimitExceededException ex)
{
return(RateLimit(ex));
}
if (externalUserId == null)
{
return(Unauthorized());
}
query = query.Where(
x => x.OAuthConnections.Any(
y => y.Provider == ApiHeaders.OAuthProvider.Value &&
y.ExternalUserId == externalUserId));
}
else
{
string canonicalName = Models.User.CanonicalizeName(ApiHeaders.Username);
if (systemIdentity == null)
{
query = query.Where(x => x.CanonicalName == canonicalName);
}
else
{
query = query.Where(x => x.CanonicalName == canonicalName || x.SystemIdentifier == systemIdentity.Uid);
}
}
var users = await query.Select(x => new Models.User
{
Id = x.Id,
PasswordHash = x.PasswordHash,
Enabled = x.Enabled,
Name = x.Name
}).ToListAsync(cancellationToken).ConfigureAwait(false);
// Pick the DB user first
var user = users
.OrderByDescending(dbUser => dbUser.PasswordHash != null)
.FirstOrDefault();
// No user? You're not allowed
if (user == null)
{
return(Unauthorized());
}
// A system user may have had their name AND password changed to one in our DB...
// Or a DB user was created that had the same user/pass as a system user
// Dumb admins...
// FALLBACK TO THE DB USER HERE, DO NOT REVEAL A SYSTEM LOGIN!!!
// This of course, allows system users to discover TGS users in this (HIGHLY IMPROBABLE) case but that is not our fault
var originalHash = user.PasswordHash;
var isDbUser = originalHash != null;
bool usingSystemIdentity = systemIdentity != null && !isDbUser;
if (!oAuthLogin)
{
if (!usingSystemIdentity)
{
// DB User password check and update
if (!cryptographySuite.CheckUserPassword(user, ApiHeaders.Password))
{
return(Unauthorized());
}
if (user.PasswordHash != originalHash)
{
Logger.LogDebug("User ID {0}'s password hash needs a refresh, updating database.", user.Id);
var updatedUser = new Models.User
{
Id = user.Id
};
DatabaseContext.Users.Attach(updatedUser);
updatedUser.PasswordHash = user.PasswordHash;
await DatabaseContext.Save(cancellationToken).ConfigureAwait(false);
}
}
else if (systemIdentity.Username != user.Name)
{
// System identity username change update
Logger.LogDebug("User ID {0}'s system identity needs a refresh, updating database.", user.Id);
DatabaseContext.Users.Attach(user);
user.Name = systemIdentity.Username;
user.CanonicalName = Models.User.CanonicalizeName(user.Name);
await DatabaseContext.Save(cancellationToken).ConfigureAwait(false);
}
}
// Now that the bookeeping is done, tell them to f**k off if necessary
if (!user.Enabled.Value)
{
Logger.LogTrace("Not logging in disabled user {0}.", user.Id);
return(Forbid());
}
var token = await tokenFactory.CreateToken(user, oAuthLogin, cancellationToken).ConfigureAwait(false);
if (usingSystemIdentity)
{
// expire the identity slightly after the auth token in case of lag
var identExpiry = token.ExpiresAt;
identExpiry += tokenFactory.ValidationParameters.ClockSkew;
identExpiry += TimeSpan.FromSeconds(15);
identityCache.CacheSystemIdentity(user, systemIdentity, identExpiry);
}
Logger.LogDebug("Successfully logged in user {0}!", user.Id);
return(Json(token));
}
}