LibWeb/CSP: Implement the font-src directive

Author: https://github.com/Lubrsi
Commit: e899438907
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5276
Reviewed-by: https://github.com/shannonbooth ✅

Libraries/LibWeb/CMakeLists.txt

@@ -40,6 +40,7 @@ set(SOURCES
     ContentSecurityPolicy/Directives/Directive.cpp
     ContentSecurityPolicy/Directives/DirectiveFactory.cpp
     ContentSecurityPolicy/Directives/DirectiveOperations.cpp
+    ContentSecurityPolicy/Directives/FontSourceDirective.cpp
     ContentSecurityPolicy/Directives/KeywordSources.cpp
     ContentSecurityPolicy/Directives/Names.cpp
     ContentSecurityPolicy/Directives/SerializedDirective.cpp

Libraries/LibWeb/ContentSecurityPolicy/Directives/DirectiveFactory.cpp

@@ -8,6 +8,7 @@
 #include <LibWeb/ContentSecurityPolicy/Directives/ConnectSourceDirective.h>
 #include <LibWeb/ContentSecurityPolicy/Directives/Directive.h>
 #include <LibWeb/ContentSecurityPolicy/Directives/DirectiveFactory.h>
+#include <LibWeb/ContentSecurityPolicy/Directives/FontSourceDirective.h>
 #include <LibWeb/ContentSecurityPolicy/Directives/Names.h>
 
 namespace Web::ContentSecurityPolicy::Directives {
@@ -17,6 +18,9 @@ GC::Ref<Directive> create_directive(GC::Heap& heap, String name, Vector<String>
     if (name == Names::ConnectSrc)
         return heap.allocate<ConnectSourceDirective>(move(name), move(value));
 
+    if (name == Names::FontSrc)
+        return heap.allocate<FontSourceDirective>(move(name), move(value));
+
     return heap.allocate<Directive>(move(name), move(value));
 }
 

Libraries/LibWeb/ContentSecurityPolicy/Directives/FontSourceDirective.cpp

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2024, Luke Wilde <luke@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/ContentSecurityPolicy/Directives/DirectiveOperations.h>
+#include <LibWeb/ContentSecurityPolicy/Directives/FontSourceDirective.h>
+#include <LibWeb/ContentSecurityPolicy/Directives/Names.h>
+#include <LibWeb/Fetch/Infrastructure/HTTP/Requests.h>
+
+namespace Web::ContentSecurityPolicy::Directives {
+
+GC_DEFINE_ALLOCATOR(FontSourceDirective);
+
+FontSourceDirective::FontSourceDirective(String name, Vector<String> value)
+    : Directive(move(name), move(value))
+{
+}
+
+// https://w3c.github.io/webappsec-csp/#font-src-pre-request
+Directive::Result FontSourceDirective::pre_request_check(GC::Heap&, GC::Ref<Fetch::Infrastructure::Request const> request, GC::Ref<Policy const> policy) const
+{
+    // 1. Let name be the result of executing § 6.8.1 Get the effective directive for request on request.
+    auto name = get_the_effective_directive_for_request(request);
+
+    // 2. If the result of executing § 6.8.4 Should fetch directive execute on name, font-src and policy is "No",
+    //    return "Allowed".
+    if (should_fetch_directive_execute(name, Names::FontSrc, policy) == ShouldExecute::No)
+        return Result::Allowed;
+
+    // 3. If the result of executing § 6.7.2.5 Does request match source list? on request, this directive’s value,
+    //    and policy, is "Does Not Match", return "Blocked".
+    if (does_request_match_source_list(request, value(), policy) == MatchResult::DoesNotMatch)
+        return Result::Blocked;
+
+    // 4. Return "Allowed".
+    return Result::Allowed;
+}
+
+// https://w3c.github.io/webappsec-csp/#font-src-post-request
+Directive::Result FontSourceDirective::post_request_check(GC::Heap&, GC::Ref<Fetch::Infrastructure::Request const> request, GC::Ref<Fetch::Infrastructure::Response const> response, GC::Ref<Policy const> policy) const
+{
+    // 1. Let name be the result of executing § 6.8.1 Get the effective directive for request on request.
+    auto name = get_the_effective_directive_for_request(request);
+
+    // 2. If the result of executing § 6.8.4 Should fetch directive execute on name, font-src and policy is "No",
+    //    return "Allowed".
+    if (should_fetch_directive_execute(name, Names::FontSrc, policy) == ShouldExecute::No)
+        return Result::Allowed;
+
+    // 3. If the result of executing § 6.7.2.6 Does response to request match source list? on response, request, this
+    //    directive’s value, and policy, is "Does Not Match", return "Blocked".
+    if (does_response_match_source_list(response, request, value(), policy) == MatchResult::DoesNotMatch)
+        return Result::Blocked;
+
+    // 4. Return "Allowed".
+    return Result::Allowed;
+}
+
+}

Libraries/LibWeb/ContentSecurityPolicy/Directives/FontSourceDirective.h

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2024, Luke Wilde <luke@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/ContentSecurityPolicy/Directives/Directive.h>
+
+namespace Web::ContentSecurityPolicy::Directives {
+
+// https://w3c.github.io/webappsec-csp/#directive-font-src
+class FontSourceDirective final : public Directive {
+    GC_CELL(FontSourceDirective, Directive)
+    GC_DECLARE_ALLOCATOR(FontSourceDirective);
+
+public:
+    virtual ~FontSourceDirective() = default;
+
+    [[nodiscard]] virtual Result pre_request_check(GC::Heap&, GC::Ref<Fetch::Infrastructure::Request const>, GC::Ref<Policy const>) const override;
+    [[nodiscard]] virtual Result post_request_check(GC::Heap&, GC::Ref<Fetch::Infrastructure::Request const>, GC::Ref<Fetch::Infrastructure::Response const>, GC::Ref<Policy const>) const override;
+
+private:
+    FontSourceDirective(String name, Vector<String> value);
+};
+
+}

Libraries/LibWeb/Forward.h

@@ -132,6 +132,7 @@ namespace Web::ContentSecurityPolicy::Directives {
 
 class ConnectSourceDirective;
 class Directive;
+class FontSourceDirective;
 struct SerializedDirective;
 
 }