cKey
4 years ago
11 changed files with 106 additions and 193 deletions
@ -1,163 +1,70 @@ |
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using Microsoft.AspNetCore.Builder; |
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using Microsoft.AspNetCore.Http; |
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using System; |
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/* |
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* See: https://community.abp.io/articles/patch-for-chrome-login-issue-identityserver4-samesite-cookie-problem-weypwp3n
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*/ |
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namespace Microsoft.Extensions.DependencyInjection |
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{ |
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public static class SameSiteCookiesServiceCollectionExtensions |
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{ |
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/// <summary>
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/// -1 defines the unspecified value, which tells ASPNET Core to NOT
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/// send the SameSite attribute. With ASPNET Core 3.1 the
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/// <seealso cref="SameSiteMode" /> enum will have a definition for
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/// Unspecified.
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/// </summary>
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private const SameSiteMode Unspecified = (SameSiteMode)(-1); |
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/// <summary>
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/// Configures a cookie policy to properly set the SameSite attribute
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/// for Browsers that handle unknown values as Strict. Ensure that you
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/// add the <seealso cref="Microsoft.AspNetCore.CookiePolicy.CookiePolicyMiddleware" />
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/// into the pipeline before sending any cookies!
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/// </summary>
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/// <remarks>
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/// Minimum ASPNET Core Version required for this code:
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/// - 2.1.14
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/// - 2.2.8
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/// - 3.0.1
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/// - 3.1.0-preview1
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/// Starting with version 80 of Chrome (to be released in February 2020)
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/// cookies with NO SameSite attribute are treated as SameSite=Lax.
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/// In order to always get the cookies send they need to be set to
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/// SameSite=None. But since the current standard only defines Lax and
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/// Strict as valid values there are some browsers that treat invalid
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/// values as SameSite=Strict. We therefore need to check the browser
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/// and either send SameSite=None or prevent the sending of SameSite=None.
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/// Relevant links:
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/// - https://tools.ietf.org/html/draft-west-first-party-cookies-07#section-4.1
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/// - https://tools.ietf.org/html/draft-west-cookie-incrementalism-00
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/// - https://www.chromium.org/updates/same-site
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/// - https://devblogs.microsoft.com/aspnet/upcoming-samesite-cookie-changes-in-asp-net-and-asp-net-core/
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/// - https://bugs.webkit.org/show_bug.cgi?id=198181
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/// </remarks>
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/// <param name="services">The service collection to register <see cref="CookiePolicyOptions" /> into.</param>
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/// <returns>The modified <see cref="IServiceCollection" />.</returns>
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public static IServiceCollection ConfigureNonBreakingSameSiteCookies(this IServiceCollection services) |
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{ |
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services.Configure<CookiePolicyOptions>(options => |
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{ |
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options.MinimumSameSitePolicy = Unspecified; |
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options.OnAppendCookie = cookieContext => |
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CheckSameSite(cookieContext.Context, cookieContext.CookieOptions); |
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options.OnDeleteCookie = cookieContext => |
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CheckSameSite(cookieContext.Context, cookieContext.CookieOptions); |
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}); |
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return services; |
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} |
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private static void CheckSameSite(HttpContext httpContext, CookieOptions options) |
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{ |
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if (options.SameSite == SameSiteMode.None) |
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{ |
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var userAgent = httpContext.Request.Headers["User-Agent"].ToString(); |
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if (DisallowsSameSiteNone(userAgent)) |
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{ |
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options.SameSite = Unspecified; |
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} |
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} |
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} |
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/// <summary>
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/// Checks if the UserAgent is known to interpret an unknown value as Strict.
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/// For those the <see cref="CookieOptions.SameSite" /> property should be
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/// set to <see cref="Unspecified" />.
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/// </summary>
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/// <remarks>
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/// This code is taken from Microsoft:
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/// https://devblogs.microsoft.com/aspnet/upcoming-samesite-cookie-changes-in-asp-net-and-asp-net-core/
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/// </remarks>
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/// <param name="userAgent">The user agent string to check.</param>
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/// <returns>Whether the specified user agent (browser) accepts SameSite=None or not.</returns>
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private static bool DisallowsSameSiteNone(string userAgent) |
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{ |
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// Cover all iOS based browsers here. This includes:
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// - Safari on iOS 12 for iPhone, iPod Touch, iPad
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// - WkWebview on iOS 12 for iPhone, iPod Touch, iPad
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// - Chrome on iOS 12 for iPhone, iPod Touch, iPad
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// All of which are broken by SameSite=None, because they use the
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// iOS networking stack.
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// Notes from Thinktecture:
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// Regarding https://caniuse.com/#search=samesite iOS versions lower
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// than 12 are not supporting SameSite at all. Starting with version 13
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// unknown values are NOT treated as strict anymore. Therefore we only
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// need to check version 12.
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if (userAgent.Contains("CPU iPhone OS 12") |
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|| userAgent.Contains("iPad; CPU OS 12")) |
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{ |
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return true; |
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} |
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// Cover Mac OS X based browsers that use the Mac OS networking stack.
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// This includes:
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// - Safari on Mac OS X.
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// This does not include:
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// - Chrome on Mac OS X
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// because they do not use the Mac OS networking stack.
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// Notes from Thinktecture:
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// Regarding https://caniuse.com/#search=samesite MacOS X versions lower
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// than 10.14 are not supporting SameSite at all. Starting with version
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// 10.15 unknown values are NOT treated as strict anymore. Therefore we
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// only need to check version 10.14.
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if (userAgent.Contains("Safari") |
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&& userAgent.Contains("Macintosh; Intel Mac OS X 10_14") |
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&& userAgent.Contains("Version/")) |
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{ |
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return true; |
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} |
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// Cover Chrome 50-69, because some versions are broken by SameSite=None
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// and none in this range require it.
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// Note: this covers some pre-Chromium Edge versions,
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// but pre-Chromium Edge does not require SameSite=None.
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// Notes from Thinktecture:
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// We can not validate this assumption, but we trust Microsofts
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// evaluation. And overall not sending a SameSite value equals to the same
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// behavior as SameSite=None for these old versions anyways.
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if (userAgent.Contains("Chrome/5") || userAgent.Contains("Chrome/6")) |
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{ |
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return true; |
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} |
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if (GetChromeVersion(userAgent) >= 80) |
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{ |
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return true; |
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} |
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return false; |
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} |
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private static int GetChromeVersion(string userAgent) |
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{ |
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try |
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{ |
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string version = "0"; |
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var chromeAgents = userAgent.Split("Chrome/"); |
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if (chromeAgents.Length > 1 && chromeAgents[1].Split('.').Length > 0) |
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{ |
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version = chromeAgents[1].Split('.')[0]; |
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} |
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return Convert.ToInt32(version); |
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} |
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catch (Exception) |
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{ |
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return 0; |
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} |
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} |
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} |
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using Microsoft.AspNetCore.Builder; |
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using Microsoft.AspNetCore.Http; |
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namespace Microsoft.Extensions.DependencyInjection |
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{ |
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public static class SameSiteCookiesServiceCollectionExtensions |
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{ |
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public static IServiceCollection AddSameSiteCookiePolicy(this IServiceCollection services) |
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{ |
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services.Configure<CookiePolicyOptions>(options => |
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{ |
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options.MinimumSameSitePolicy = SameSiteMode.Unspecified; |
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options.OnAppendCookie = cookieContext => |
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CheckSameSite(cookieContext.Context, cookieContext.CookieOptions); |
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options.OnDeleteCookie = cookieContext => |
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CheckSameSite(cookieContext.Context, cookieContext.CookieOptions); |
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}); |
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return services; |
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} |
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private static void CheckSameSite(HttpContext httpContext, CookieOptions options) |
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{ |
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if (options.SameSite == SameSiteMode.None) |
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{ |
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var userAgent = httpContext.Request.Headers["User-Agent"].ToString(); |
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if (!httpContext.Request.IsHttps || DisallowsSameSiteNone(userAgent)) |
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{ |
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// For .NET Core < 3.1 set SameSite = (SameSiteMode)(-1)
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options.SameSite = SameSiteMode.Unspecified; |
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} |
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} |
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} |
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private static bool DisallowsSameSiteNone(string userAgent) |
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{ |
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// Cover all iOS based browsers here. This includes:
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// - Safari on iOS 12 for iPhone, iPod Touch, iPad
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// - WkWebview on iOS 12 for iPhone, iPod Touch, iPad
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// - Chrome on iOS 12 for iPhone, iPod Touch, iPad
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// All of which are broken by SameSite=None, because they use the iOS networking stack
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if (userAgent.Contains("CPU iPhone OS 12") || userAgent.Contains("iPad; CPU OS 12")) |
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{ |
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return true; |
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} |
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// Cover Mac OS X based browsers that use the Mac OS networking stack. This includes:
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// - Safari on Mac OS X.
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// This does not include:
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// - Chrome on Mac OS X
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// Because they do not use the Mac OS networking stack.
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if (userAgent.Contains("Macintosh; Intel Mac OS X 10_14") && |
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userAgent.Contains("Version/") && userAgent.Contains("Safari")) |
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{ |
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return true; |
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} |
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// Cover Chrome 50-69, because some versions are broken by SameSite=None,
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// and none in this range require it.
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// Note: this covers some pre-Chromium Edge versions,
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// but pre-Chromium Edge does not require SameSite=None.
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if (userAgent.Contains("Chrome/5") || userAgent.Contains("Chrome/6")) |
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{ |
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return true; |
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} |
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return false; |
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} |
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} |
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} |
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