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//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.IdentityModel.Selectors
{
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Text;
using System.IdentityModel.Claims;
using System.IdentityModel.Tokens;
using System.IdentityModel.Policy;
using System.Security.Principal;
using System.Security;
public class SamlSecurityTokenAuthenticator : SecurityTokenAuthenticator
{
List<SecurityTokenAuthenticator> supportingAuthenticators;
Collection<string> allowedAudienceUris;
AudienceUriMode audienceUriMode;
TimeSpan maxClockSkew;
public SamlSecurityTokenAuthenticator(IList<SecurityTokenAuthenticator> supportingAuthenticators)
: this(supportingAuthenticators, TimeSpan.Zero)
{ }
public SamlSecurityTokenAuthenticator(IList<SecurityTokenAuthenticator> supportingAuthenticators, TimeSpan maxClockSkew)
{
if (supportingAuthenticators == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("supportingAuthenticators");
this.supportingAuthenticators = new List<SecurityTokenAuthenticator>(supportingAuthenticators.Count);
for (int i = 0; i < supportingAuthenticators.Count; ++i)
{
this.supportingAuthenticators.Add(supportingAuthenticators[i]);
}
this.maxClockSkew = maxClockSkew;
this.audienceUriMode = AudienceUriMode.Always;
this.allowedAudienceUris = new Collection<string>();
}
public AudienceUriMode AudienceUriMode
{
get { return this.audienceUriMode; }
set
{
AudienceUriModeValidationHelper.Validate(audienceUriMode);
this.audienceUriMode = value;
}
}
public IList<string> AllowedAudienceUris
{
get { return this.allowedAudienceUris; }
}
protected override bool CanValidateTokenCore(SecurityToken token)
{
return token is SamlSecurityToken;
}
protected override ReadOnlyCollection<IAuthorizationPolicy> ValidateTokenCore(SecurityToken token)
{
if (token == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("token");
SamlSecurityToken samlToken = token as SamlSecurityToken;
if (samlToken == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SamlTokenAuthenticatorCanOnlyProcessSamlTokens, token.GetType().ToString())));
if (samlToken.Assertion.Signature == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SamlTokenMissingSignature)));
if (!this.IsCurrentlyTimeEffective(samlToken))
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLTokenTimeInvalid, DateTime.UtcNow.ToUniversalTime(), samlToken.ValidFrom.ToString(), samlToken.ValidTo.ToString())));
if (samlToken.Assertion.SigningToken == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SamlSigningTokenMissing)));
// Build the Issuer ClaimSet for this Saml token.
ClaimSet issuer = null;
bool canBeValidated = false;
for (int i = 0; i < this.supportingAuthenticators.Count; ++i)
{
canBeValidated = this.supportingAuthenticators[i].CanValidateToken(samlToken.Assertion.SigningToken);
if (canBeValidated)
break;
}
if (!canBeValidated)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SamlInvalidSigningToken)));
issuer = ResolveClaimSet(samlToken.Assertion.SigningToken) ?? ClaimSet.Anonymous;
List<IAuthorizationPolicy> policies = new List<IAuthorizationPolicy>();
for (int i = 0; i < samlToken.Assertion.Statements.Count; ++i)
{
policies.Add(samlToken.Assertion.Statements[i].CreatePolicy(issuer, this));
}
// Check AudienceUri if required
// AudienceUriMode != Never - don't need to check can only be one of three
// AudienceUriMode == Always
// AudienceUriMode == BearerKey and there are no proof keys
//
if ((this.audienceUriMode == AudienceUriMode.Always)
|| (this.audienceUriMode == AudienceUriMode.BearerKeyOnly) && (samlToken.SecurityKeys.Count < 1))
{
// throws if not found.
bool foundAudienceCondition = false;
if (this.allowedAudienceUris == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAudienceUrisNotFound)));
}
for (int i = 0; i < samlToken.Assertion.Conditions.Conditions.Count; i++)
{
SamlAudienceRestrictionCondition audienceCondition = samlToken.Assertion.Conditions.Conditions[i] as SamlAudienceRestrictionCondition;
if (audienceCondition == null)
continue;
foundAudienceCondition = true;
if (!ValidateAudienceRestriction(audienceCondition))
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAudienceUriValidationFailed)));
}
}
if (!foundAudienceCondition)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLAudienceUriValidationFailed)));
}
return policies.AsReadOnly();
}
protected virtual bool ValidateAudienceRestriction(SamlAudienceRestrictionCondition audienceRestrictionCondition)
{
for (int i = 0; i < audienceRestrictionCondition.Audiences.Count; i++)
{
if (audienceRestrictionCondition.Audiences[i] == null)
continue;
for (int j = 0; j < this.allowedAudienceUris.Count; j++)
{
if (StringComparer.Ordinal.Compare(audienceRestrictionCondition.Audiences[i].AbsoluteUri, this.allowedAudienceUris[j]) == 0)
return true;
else if (Uri.IsWellFormedUriString(this.allowedAudienceUris[j], UriKind.Absolute))
{
Uri uri = new Uri(this.allowedAudienceUris[j]);
if (audienceRestrictionCondition.Audiences[i].Equals(uri))
return true;
}
}
}
return false;
}
public virtual ClaimSet ResolveClaimSet(SecurityToken token)
{
if (token == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("token");
for (int i = 0; i < this.supportingAuthenticators.Count; ++i)
{
if (this.supportingAuthenticators[i].CanValidateToken(token))
{
ReadOnlyCollection<IAuthorizationPolicy> authorizationPolicies = this.supportingAuthenticators[i].ValidateToken(token);
AuthorizationContext authContext = AuthorizationContext.CreateDefaultAuthorizationContext(authorizationPolicies);
if (authContext.ClaimSets.Count > 0)
{
return authContext.ClaimSets[0];
}
}
}
return null;
}
public virtual ClaimSet ResolveClaimSet(SecurityKeyIdentifier keyIdentifier)
{
if (keyIdentifier == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifier");
RsaKeyIdentifierClause rsaKeyIdentifierClause;
EncryptedKeyIdentifierClause encryptedKeyIdentifierClause;
if (keyIdentifier.TryFind<RsaKeyIdentifierClause>(out rsaKeyIdentifierClause))
{
return new DefaultClaimSet(new Claim(ClaimTypes.Rsa, rsaKeyIdentifierClause.Rsa, Rights.PossessProperty));
}
else if (keyIdentifier.TryFind<EncryptedKeyIdentifierClause>(out encryptedKeyIdentifierClause))
{
return new DefaultClaimSet(Claim.CreateHashClaim(encryptedKeyIdentifierClause.GetBuffer()));
}
return null;
}
public virtual IIdentity ResolveIdentity(SecurityToken token)
{
if (token == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("token");
for (int i = 0; i < this.supportingAuthenticators.Count; ++i)
{
if (this.supportingAuthenticators[i].CanValidateToken(token))
{
ReadOnlyCollection<IAuthorizationPolicy> authorizationPolicies = this.supportingAuthenticators[i].ValidateToken(token);
if (authorizationPolicies != null && authorizationPolicies.Count != 0)
{
for (int j = 0; j < authorizationPolicies.Count; ++j)
{
IAuthorizationPolicy policy = authorizationPolicies[j];
if (policy is UnconditionalPolicy)
{
return ((UnconditionalPolicy)policy).PrimaryIdentity;
}
}
}
}
}
return null;
}
public virtual IIdentity ResolveIdentity(SecurityKeyIdentifier keyIdentifier)
{
if (keyIdentifier == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifier");
RsaKeyIdentifierClause rsaKeyIdentifierClause;
if (keyIdentifier.TryFind<RsaKeyIdentifierClause>(out rsaKeyIdentifierClause))
{
return SecurityUtils.CreateIdentity(rsaKeyIdentifierClause.Rsa.ToXmlString(false), this.GetType().Name);
}
return null;
}
bool IsCurrentlyTimeEffective(SamlSecurityToken token)
{
if (token.Assertion.Conditions != null)
{
return SecurityUtils.IsCurrentlyTimeEffective(token.Assertion.Conditions.NotBefore, token.Assertion.Conditions.NotOnOrAfter, this.maxClockSkew);
}
// If SAML Condition is not present then the assertion is valid at any given time.
return true;
}
}
}
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