diff options
Diffstat (limited to 'src/Agent.Windows/Security')
| -rw-r--r-- | src/Agent.Windows/Security/AppContainerProfile.cs | 8 | ||||
| -rw-r--r-- | src/Agent.Windows/Security/TaskAclManager.cs | 27 |
2 files changed, 34 insertions, 1 deletions
diff --git a/src/Agent.Windows/Security/AppContainerProfile.cs b/src/Agent.Windows/Security/AppContainerProfile.cs index 47aa64e..97258ec 100644 --- a/src/Agent.Windows/Security/AppContainerProfile.cs +++ b/src/Agent.Windows/Security/AppContainerProfile.cs @@ -27,6 +27,14 @@ public sealed partial class AppContainerProfile } } + public static AppContainerProfile DeriveFixed() + { + int result = Native.DeriveAppContainerSidFromAppContainerName(FixedName, out nint sidPointer); + if (result < 0) Marshal.ThrowExceptionForHR(result); + try { return new(FixedName, new SecurityIdentifier(sidPointer)); } + finally { if (sidPointer != 0) _ = Native.FreeSid(sidPointer); } + } + private static partial class Native { [LibraryImport("userenv.dll", StringMarshalling = StringMarshalling.Utf16)] diff --git a/src/Agent.Windows/Security/TaskAclManager.cs b/src/Agent.Windows/Security/TaskAclManager.cs index be0080d..6534e5a 100644 --- a/src/Agent.Windows/Security/TaskAclManager.cs +++ b/src/Agent.Windows/Security/TaskAclManager.cs @@ -1,13 +1,34 @@ +using System.ComponentModel; +using System.Runtime.InteropServices; using System.Security.AccessControl; using System.Security.Principal; using Agent.Windows.Recovery; +using Microsoft.Win32.SafeHandles; namespace Agent.Windows.Security; public sealed record AclSnapshot(string Path, byte[] SecurityDescriptor, Guid? JournalEntryId = null); -public sealed class TaskAclManager(SecurityIdentifier appContainerSid, ISecurityAuditSink audit, TaskResourceJournal? journal = null) +public sealed partial class TaskAclManager(SecurityIdentifier appContainerSid, ISecurityAuditSink audit, TaskResourceJournal? journal = null) { + private const uint WriteDac = 0x00040000; + private const uint ShareReadWriteDelete = 0x00000007; + private const uint OpenExisting = 3; + private const uint BackupSemantics = 0x02000000; + + public static void DemandWriteDac(string path) + { + string canonical = ResolvedPath.Resolve(path); + uint flags = Directory.Exists(canonical) ? BackupSemantics : 0; + using SafeFileHandle handle = CreateFile(canonical, WriteDac, ShareReadWriteDelete, 0, OpenExisting, flags, 0); + if (!handle.IsInvalid) return; + int error = Marshal.GetLastPInvokeError(); + throw new SandboxPolicyException("sandbox.access_denied", + $"The current user cannot open '{canonical}' with WRITE_DAC ({new Win32Exception(error).Message}).", + "acl", canonical, "WRITE_DAC", + "Use a root owned by the current user or grant that user WRITE_DAC; elevation does not bypass this requirement."); + } + public AclSnapshot Grant(Guid taskId, string path, FileCapability capabilities) { string canonical = ResolvedPath.Resolve(path); @@ -112,4 +133,8 @@ public sealed class TaskAclManager(SecurityIdentifier appContainerSid, ISecurity if ((capabilities & FileCapability.Delete) != 0) rights |= FileSystemRights.Delete | FileSystemRights.DeleteSubdirectoriesAndFiles; return rights; } + + [LibraryImport("kernel32.dll", EntryPoint = "CreateFileW", SetLastError = true, StringMarshalling = StringMarshalling.Utf16)] + private static partial SafeFileHandle CreateFile(string fileName, uint desiredAccess, uint shareMode, + nint securityAttributes, uint creationDisposition, uint flagsAndAttributes, nint templateFile); } |