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72 lines
2.8 KiB
72 lines
2.8 KiB
1 year ago
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using Microsoft.AspNetCore.Builder;
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using Microsoft.AspNetCore.Http;
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using Microsoft.Extensions.DependencyInjection;
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namespace AuthServer.Host
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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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