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using Microsoft.AspNetCore.Builder; |
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using Microsoft.AspNetCore.Http; |
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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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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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|
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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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