Code:
/ WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / ServiceModel / System / ServiceModel / Security / SecurityTimestamp.cs / 1 / SecurityTimestamp.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace System.ServiceModel.Security { using System.Diagnostics; using System.ServiceModel.Channels; using System.Globalization; using System.Xml; sealed class SecurityTimestamp { const string DefaultFormat = "yyyy-MM-ddTHH:mm:ss.fffZ"; // 012345678901234567890123 internal static readonly TimeSpan defaultTimeToLive = SecurityProtocolFactory.defaultTimestampValidityDuration; char[] computedCreationTimeUtc; char[] computedExpiryTimeUtc; DateTime creationTimeUtc; DateTime expiryTimeUtc; readonly string id; readonly string digestAlgorithm; readonly byte[] digest; public SecurityTimestamp(DateTime creationTimeUtc, DateTime expiryTimeUtc, string id) : this(creationTimeUtc, expiryTimeUtc, id, null, null) { } internal SecurityTimestamp(DateTime creationTimeUtc, DateTime expiryTimeUtc, string id, string digestAlgorithm, byte[] digest) { DiagnosticUtility.DebugAssert(creationTimeUtc.Kind == DateTimeKind.Utc, "creation time must be in UTC"); DiagnosticUtility.DebugAssert(expiryTimeUtc.Kind == DateTimeKind.Utc, "expiry time must be in UTC"); if (creationTimeUtc > expiryTimeUtc) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new ArgumentOutOfRangeException("recordedExpiryTime",SR.GetString(SR.CreationTimeUtcIsAfterExpiryTime))); } this.creationTimeUtc = creationTimeUtc; this.expiryTimeUtc = expiryTimeUtc; this.id = id; this.digestAlgorithm = digestAlgorithm; this.digest = digest; } public DateTime CreationTimeUtc { get { return this.creationTimeUtc; } } public DateTime ExpiryTimeUtc { get { return this.expiryTimeUtc; } } public string Id { get { return this.id; } } public string DigestAlgorithm { get { return this.digestAlgorithm; } } internal byte[] GetDigest() { return this.digest; } internal char[] GetCreationTimeChars() { if (this.computedCreationTimeUtc == null) { this.computedCreationTimeUtc = ToChars(ref this.creationTimeUtc); } return this.computedCreationTimeUtc; } internal char[] GetExpiryTimeChars() { if (this.computedExpiryTimeUtc == null) { this.computedExpiryTimeUtc = ToChars(ref this.expiryTimeUtc); } return this.computedExpiryTimeUtc; } static char[] ToChars(ref DateTime utcTime) { char[] buffer = new char[DefaultFormat.Length]; int offset = 0; ToChars(utcTime.Year, buffer, ref offset, 4); buffer[offset++] = '-'; ToChars(utcTime.Month, buffer, ref offset, 2); buffer[offset++] = '-'; ToChars(utcTime.Day, buffer, ref offset, 2); buffer[offset++] = 'T'; ToChars(utcTime.Hour, buffer, ref offset, 2); buffer[offset++] = ':'; ToChars(utcTime.Minute, buffer, ref offset, 2); buffer[offset++] = ':'; ToChars(utcTime.Second, buffer, ref offset, 2); buffer[offset++] = '.'; ToChars(utcTime.Millisecond, buffer, ref offset, 3); buffer[offset++] = 'Z'; return buffer; } static void ToChars(int n, char[] buffer, ref int offset, int count) { for (int i = offset + count - 1; i >= offset; i--) { buffer[i] = (char) ('0' + (n % 10)); n /= 10; } DiagnosticUtility.DebugAssert(n == 0, "Overflow in encoding timestamp field"); offset += count; } public override string ToString() { return string.Format( CultureInfo.InvariantCulture, "SecurityTimestamp: Id={0}, CreationTimeUtc={1}, ExpirationTimeUtc={2}", this.Id, XmlConvert.ToString(this.CreationTimeUtc, XmlDateTimeSerializationMode.RoundtripKind), XmlConvert.ToString(this.ExpiryTimeUtc, XmlDateTimeSerializationMode.RoundtripKind)); } ////// Internal method that checks if the timestamp is fresh with respect to the /// timeToLive and allowedClockSkew values passed in. /// Throws if the timestamp is stale. /// /// /// internal void ValidateRangeAndFreshness(TimeSpan timeToLive, TimeSpan allowedClockSkew) { // Check that the creation time is less than expiry time if (this.CreationTimeUtc >= this.ExpiryTimeUtc) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new MessageSecurityException(SR.GetString(SR.TimeStampHasCreationAheadOfExpiry, this.CreationTimeUtc.ToString(DefaultFormat, CultureInfo.CurrentCulture), this.ExpiryTimeUtc.ToString(DefaultFormat, CultureInfo.CurrentCulture)))); } ValidateFreshness(timeToLive, allowedClockSkew); } internal void ValidateFreshness(TimeSpan timeToLive, TimeSpan allowedClockSkew) { DateTime now = DateTime.UtcNow; // check that the message has not expired if (this.ExpiryTimeUtc <= TimeoutHelper.Subtract(now, allowedClockSkew)) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new MessageSecurityException(SR.GetString(SR.TimeStampHasExpiryTimeInPast, this.ExpiryTimeUtc.ToString(DefaultFormat, CultureInfo.CurrentCulture), now.ToString(DefaultFormat, CultureInfo.CurrentCulture), allowedClockSkew))); } // check that creation time is not in the future (modulo clock skew) if (this.CreationTimeUtc >= TimeoutHelper.Add(now, allowedClockSkew)) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new MessageSecurityException(SR.GetString(SR.TimeStampHasCreationTimeInFuture, this.CreationTimeUtc.ToString(DefaultFormat, CultureInfo.CurrentCulture), now.ToString(DefaultFormat, CultureInfo.CurrentCulture), allowedClockSkew))); } // check that the creation time is not more than timeToLive in the past if (this.CreationTimeUtc <= TimeoutHelper.Subtract(now, TimeoutHelper.Add(timeToLive, allowedClockSkew))) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new MessageSecurityException(SR.GetString(SR.TimeStampWasCreatedTooLongAgo, this.CreationTimeUtc.ToString(DefaultFormat, CultureInfo.CurrentCulture), now.ToString(DefaultFormat, CultureInfo.CurrentCulture), timeToLive, allowedClockSkew))); } // this is a fresh timestamp } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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