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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
//
// A HostSecurityManager gives a hosting application the chance to
// participate in the security decisions in the AppDomain.
//
namespace System.Security {
using System.Collections;
#if FEATURE_CLICKONCE
using System.Deployment.Internal.Isolation;
using System.Deployment.Internal.Isolation.Manifest;
using System.Runtime.Hosting;
#endif
using System.Reflection;
using System.Security;
using System.Security.Permissions;
using System.Security.Policy;
using System.Runtime.Versioning;
using System.Diagnostics.Contracts;
[Serializable]
[Flags]
[System.Runtime.InteropServices.ComVisible(true)]
public enum HostSecurityManagerOptions {
None = 0x0000,
HostAppDomainEvidence = 0x0001,
[Obsolete("AppDomain policy levels are obsolete and will be removed in a future release of the .NET Framework. See http://go.microsoft.com/fwlink/?LinkID=155570 for more information.")]
HostPolicyLevel = 0x0002,
HostAssemblyEvidence = 0x0004,
HostDetermineApplicationTrust = 0x0008,
HostResolvePolicy = 0x0010,
AllFlags = 0x001F
}
[System.Security.SecurityCritical] // auto-generated_required
[Serializable]
#if !FEATURE_CORECLR
[SecurityPermissionAttribute(SecurityAction.InheritanceDemand, Flags=SecurityPermissionFlag.Infrastructure)]
#endif
[System.Runtime.InteropServices.ComVisible(true)]
public class HostSecurityManager {
public HostSecurityManager () {}
// The host can choose which events he wants to participate in. This property can be set when
// the host only cares about a subset of the capabilities exposed through the HostSecurityManager.
public virtual HostSecurityManagerOptions Flags {
get {
// We use AllFlags as the default.
return HostSecurityManagerOptions.AllFlags;
}
}
#if FEATURE_CAS_POLICY
// provide policy for the AppDomain.
[Obsolete("AppDomain policy levels are obsolete and will be removed in a future release of the .NET Framework. See http://go.microsoft.com/fwlink/?LinkID=155570 for more information.")]
public virtual PolicyLevel DomainPolicy {
get {
if (!AppDomain.CurrentDomain.IsLegacyCasPolicyEnabled)
{
throw new NotSupportedException(Environment.GetResourceString("NotSupported_RequiresCasPolicyExplicit"));
}
return null;
}
}
#endif
public virtual Evidence ProvideAppDomainEvidence (Evidence inputEvidence) {
// The default implementation does not modify the input evidence.
return inputEvidence;
}
public virtual Evidence ProvideAssemblyEvidence (Assembly loadedAssembly, Evidence inputEvidence) {
// The default implementation does not modify the input evidence.
return inputEvidence;
}
#if FEATURE_CLICKONCE
[System.Security.SecurityCritical] // auto-generated
[SecurityPermissionAttribute(SecurityAction.Assert, Unrestricted=true)]
public virtual ApplicationTrust DetermineApplicationTrust(Evidence applicationEvidence, Evidence activatorEvidence, TrustManagerContext context)
{
if (applicationEvidence == null)
throw new ArgumentNullException("applicationEvidence");
Contract.EndContractBlock();
// This method looks for a trust decision for the ActivationContext in three locations, in order
// of preference:
//
// 1. Supplied by the host in the AppDomainSetup. If the host supplied a decision this way, it
// will be in the applicationEvidence.
// 2. Reuse the ApplicationTrust from the current AppDomain
// 3. Ask the TrustManager for a trust decision
// get the activation context from the application evidence.
// The default HostSecurityManager does not examine the activatorEvidence
// but other security managers could use it to figure out the
// evidence of the domain attempting to activate the application.
ActivationArguments activationArgs = applicationEvidence.GetHostEvidence<ActivationArguments>();
if (activationArgs == null)
throw new ArgumentException(Environment.GetResourceString("Policy_MissingActivationContextInAppEvidence"));
ActivationContext actCtx = activationArgs.ActivationContext;
if (actCtx == null)
throw new ArgumentException(Environment.GetResourceString("Policy_MissingActivationContextInAppEvidence"));
// Make sure that any ApplicationTrust we find applies to the ActivationContext we're
// creating the new AppDomain for.
ApplicationTrust appTrust = applicationEvidence.GetHostEvidence<ApplicationTrust>();
if (appTrust != null &&
!CmsUtils.CompareIdentities(appTrust.ApplicationIdentity, activationArgs.ApplicationIdentity, ApplicationVersionMatch.MatchExactVersion))
{
appTrust = null;
}
// If there was not a trust decision supplied in the Evidence, we can reuse the existing trust
// decision from this domain if its identity matches the ActivationContext of the new domain.
// Otherwise consult the TrustManager for a trust decision
if (appTrust == null)
{
if (AppDomain.CurrentDomain.ApplicationTrust != null &&
CmsUtils.CompareIdentities(AppDomain.CurrentDomain.ApplicationTrust.ApplicationIdentity, activationArgs.ApplicationIdentity, ApplicationVersionMatch.MatchExactVersion))
{
appTrust = AppDomain.CurrentDomain.ApplicationTrust;
}
else
{
appTrust = ApplicationSecurityManager.DetermineApplicationTrustInternal(actCtx, context);
}
}
// If the trust decision allows the application to run, then it should also have a permission set
// which is at least the permission set the application requested.
ApplicationSecurityInfo appRequest = new ApplicationSecurityInfo(actCtx);
if (appTrust != null &&
appTrust.IsApplicationTrustedToRun &&
!appRequest.DefaultRequestSet.IsSubsetOf(appTrust.DefaultGrantSet.PermissionSet))
{
throw new InvalidOperationException(Environment.GetResourceString("Policy_AppTrustMustGrantAppRequest"));
}
return appTrust;
}
#endif // FEATURE_CLICKONCE
#if FEATURE_CAS_POLICY
// Query the CLR to see what it would have granted a specific set of evidence
public virtual PermissionSet ResolvePolicy(Evidence evidence)
{
if (evidence == null)
throw new ArgumentNullException("evidence");
Contract.EndContractBlock();
//
// If the evidence is from the GAC then the result is full trust.
// In a homogenous domain, then the application trust object provides the grant set.
// When CAS policy is disabled, the result is full trust.
// Otherwise, the result comes from evaluating CAS policy.
//
if (evidence.GetHostEvidence<GacInstalled>() != null)
{
return new PermissionSet(PermissionState.Unrestricted);
}
else if (AppDomain.CurrentDomain.IsHomogenous)
{
return AppDomain.CurrentDomain.GetHomogenousGrantSet(evidence);
}
else if (!AppDomain.CurrentDomain.IsLegacyCasPolicyEnabled)
{
return new PermissionSet(PermissionState.Unrestricted);
}
else
{
return SecurityManager.PolicyManager.CodeGroupResolve(evidence, false);
}
}
#endif
/// <summary>
/// Determine what types of evidence the host might be able to supply for the AppDomain if requested
/// </summary>
/// <returns></returns>
public virtual Type[] GetHostSuppliedAppDomainEvidenceTypes() {
return null;
}
/// <summary>
/// Determine what types of evidence the host might be able to supply for an assembly if requested
/// </summary>
public virtual Type[] GetHostSuppliedAssemblyEvidenceTypes(Assembly assembly) {
return null;
}
/// <summary>
/// Ask the host to supply a specific type of evidence for the AppDomain
/// </summary>
public virtual EvidenceBase GenerateAppDomainEvidence(Type evidenceType) {
return null;
}
/// <summary>
/// Ask the host to supply a specific type of evidence for an assembly
/// </summary>
public virtual EvidenceBase GenerateAssemblyEvidence(Type evidenceType, Assembly assembly) {
return null;
}
}
}
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