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576 lines
19 KiB
C++
576 lines
19 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsCSPUtils_h___
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#define nsCSPUtils_h___
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#include "nsCOMPtr.h"
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#include "nsIContentPolicy.h"
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#include "nsIContentSecurityPolicy.h"
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#include "nsIURI.h"
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#include "nsString.h"
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#include "nsTArray.h"
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#include "nsUnicharUtils.h"
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#include "mozilla/Logging.h"
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namespace mozilla {
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namespace dom {
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struct CSP;
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} // namespace dom
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} // namespace mozilla
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/* =============== Logging =================== */
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void CSP_LogLocalizedStr(const char16_t* aName,
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const char16_t** aParams,
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uint32_t aLength,
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const nsAString& aSourceName,
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const nsAString& aSourceLine,
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uint32_t aLineNumber,
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uint32_t aColumnNumber,
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uint32_t aFlags,
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const char* aCategory,
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uint32_t aInnerWindowID);
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void CSP_GetLocalizedStr(const char16_t* aName,
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const char16_t** aParams,
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uint32_t aLength,
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char16_t** outResult);
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void CSP_LogStrMessage(const nsAString& aMsg);
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void CSP_LogMessage(const nsAString& aMessage,
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const nsAString& aSourceName,
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const nsAString& aSourceLine,
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uint32_t aLineNumber,
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uint32_t aColumnNumber,
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uint32_t aFlags,
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const char* aCategory,
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uint32_t aInnerWindowID);
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/* =============== Constant and Type Definitions ================== */
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#define INLINE_STYLE_VIOLATION_OBSERVER_TOPIC "violated base restriction: Inline Stylesheets will not apply"
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#define INLINE_SCRIPT_VIOLATION_OBSERVER_TOPIC "violated base restriction: Inline Scripts will not execute"
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#define EVAL_VIOLATION_OBSERVER_TOPIC "violated base restriction: Code will not be created from strings"
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#define SCRIPT_NONCE_VIOLATION_OBSERVER_TOPIC "Inline Script had invalid nonce"
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#define STYLE_NONCE_VIOLATION_OBSERVER_TOPIC "Inline Style had invalid nonce"
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#define SCRIPT_HASH_VIOLATION_OBSERVER_TOPIC "Inline Script had invalid hash"
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#define STYLE_HASH_VIOLATION_OBSERVER_TOPIC "Inline Style had invalid hash"
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#define REQUIRE_SRI_SCRIPT_VIOLATION_OBSERVER_TOPIC "Missing required Subresource Integrity for Script"
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#define REQUIRE_SRI_STYLE_VIOLATION_OBSERVER_TOPIC "Missing required Subresource Integrity for Style"
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// these strings map to the CSPDirectives in nsIContentSecurityPolicy
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// NOTE: When implementing a new directive, you will need to add it here but also
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// add a corresponding entry to the constants in nsIContentSecurityPolicy.idl
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// and also create an entry for the new directive in
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// nsCSPDirective::toDomCSPStruct() and add it to CSPDictionaries.webidl.
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// Order of elements below important! Make sure it matches the order as in
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// nsIContentSecurityPolicy.idl
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static const char* CSPStrDirectives[] = {
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"-error-", // NO_DIRECTIVE
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"default-src", // DEFAULT_SRC_DIRECTIVE
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"script-src", // SCRIPT_SRC_DIRECTIVE
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"object-src", // OBJECT_SRC_DIRECTIVE
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"style-src", // STYLE_SRC_DIRECTIVE
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"img-src", // IMG_SRC_DIRECTIVE
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"media-src", // MEDIA_SRC_DIRECTIVE
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"frame-src", // FRAME_SRC_DIRECTIVE
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"font-src", // FONT_SRC_DIRECTIVE
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"connect-src", // CONNECT_SRC_DIRECTIVE
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"report-uri", // REPORT_URI_DIRECTIVE
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"frame-ancestors", // FRAME_ANCESTORS_DIRECTIVE
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"reflected-xss", // REFLECTED_XSS_DIRECTIVE
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"base-uri", // BASE_URI_DIRECTIVE
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"form-action", // FORM_ACTION_DIRECTIVE
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"referrer", // REFERRER_DIRECTIVE
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"manifest-src", // MANIFEST_SRC_DIRECTIVE
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"upgrade-insecure-requests", // UPGRADE_IF_INSECURE_DIRECTIVE
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"child-src", // CHILD_SRC_DIRECTIVE
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"block-all-mixed-content", // BLOCK_ALL_MIXED_CONTENT
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"require-sri-for" // REQUIRE_SRI_FOR
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};
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inline const char* CSP_CSPDirectiveToString(CSPDirective aDir)
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{
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return CSPStrDirectives[static_cast<uint32_t>(aDir)];
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}
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inline CSPDirective CSP_StringToCSPDirective(const nsAString& aDir)
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{
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nsString lowerDir = PromiseFlatString(aDir);
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ToLowerCase(lowerDir);
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uint32_t numDirs = (sizeof(CSPStrDirectives) / sizeof(CSPStrDirectives[0]));
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for (uint32_t i = 1; i < numDirs; i++) {
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if (lowerDir.EqualsASCII(CSPStrDirectives[i])) {
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return static_cast<CSPDirective>(i);
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}
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}
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NS_ASSERTION(false, "Can not convert unknown Directive to Integer");
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return nsIContentSecurityPolicy::NO_DIRECTIVE;
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}
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// Please add any new enum items not only to CSPKeyword, but also add
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// a string version for every enum >> using the same index << to
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// CSPStrKeywords underneath.
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enum CSPKeyword {
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CSP_SELF = 0,
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CSP_UNSAFE_INLINE,
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CSP_UNSAFE_EVAL,
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CSP_NONE,
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CSP_NONCE,
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CSP_REQUIRE_SRI_FOR,
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// CSP_LAST_KEYWORD_VALUE always needs to be the last element in the enum
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// because we use it to calculate the size for the char* array.
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CSP_LAST_KEYWORD_VALUE,
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// Putting CSP_HASH after the delimitor, because CSP_HASH is not a valid
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// keyword (hash uses e.g. sha256, sha512) but we use CSP_HASH internally
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// to identify allowed hashes in ::allows.
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CSP_HASH
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};
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static const char* CSPStrKeywords[] = {
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"'self'", // CSP_SELF = 0
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"'unsafe-inline'", // CSP_UNSAFE_INLINE
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"'unsafe-eval'", // CSP_UNSAFE_EVAL
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"'none'", // CSP_NONE
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"'nonce-", // CSP_NONCE
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"require-sri-for" // CSP_REQUIRE_SRI_FOR
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// Remember: CSP_HASH is not supposed to be used
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};
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inline const char* CSP_EnumToKeyword(enum CSPKeyword aKey)
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{
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// Make sure all elements in enum CSPKeyword got added to CSPStrKeywords.
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static_assert((sizeof(CSPStrKeywords) / sizeof(CSPStrKeywords[0]) ==
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static_cast<uint32_t>(CSP_LAST_KEYWORD_VALUE)),
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"CSP_LAST_KEYWORD_VALUE does not match length of CSPStrKeywords");
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if (static_cast<uint32_t>(aKey) < static_cast<uint32_t>(CSP_LAST_KEYWORD_VALUE)) {
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return CSPStrKeywords[static_cast<uint32_t>(aKey)];
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}
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return "error: invalid keyword in CSP_EnumToKeyword";
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}
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inline CSPKeyword CSP_KeywordToEnum(const nsAString& aKey)
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{
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nsString lowerKey = PromiseFlatString(aKey);
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ToLowerCase(lowerKey);
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static_assert(CSP_LAST_KEYWORD_VALUE ==
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(sizeof(CSPStrKeywords) / sizeof(CSPStrKeywords[0])),
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"CSP_LAST_KEYWORD_VALUE does not match length of CSPStrKeywords");
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for (uint32_t i = 0; i < CSP_LAST_KEYWORD_VALUE; i++) {
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if (lowerKey.EqualsASCII(CSPStrKeywords[i])) {
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return static_cast<CSPKeyword>(i);
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}
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}
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NS_ASSERTION(false, "Can not convert unknown Keyword to Enum");
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return CSP_LAST_KEYWORD_VALUE;
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}
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/* =============== Helpers ================== */
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class nsCSPHostSrc;
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nsCSPHostSrc* CSP_CreateHostSrcFromURI(nsIURI* aURI);
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bool CSP_IsValidDirective(const nsAString& aDir);
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bool CSP_IsDirective(const nsAString& aValue, CSPDirective aDir);
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bool CSP_IsKeyword(const nsAString& aValue, enum CSPKeyword aKey);
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bool CSP_IsQuotelessKeyword(const nsAString& aKey);
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CSPDirective CSP_ContentTypeToDirective(nsContentPolicyType aType);
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class nsCSPSrcVisitor;
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/* =============== nsCSPSrc ================== */
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class nsCSPBaseSrc {
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public:
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nsCSPBaseSrc();
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virtual ~nsCSPBaseSrc();
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virtual bool permits(nsIURI* aUri, const nsAString& aNonce, bool aWasRedirected,
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bool aReportOnly, bool aUpgradeInsecure) const;
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virtual bool allows(enum CSPKeyword aKeyword, const nsAString& aHashOrNonce) const;
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virtual bool visit(nsCSPSrcVisitor* aVisitor) const = 0;
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virtual void toString(nsAString& outStr) const = 0;
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};
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/* =============== nsCSPSchemeSrc ============ */
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class nsCSPSchemeSrc : public nsCSPBaseSrc {
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public:
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explicit nsCSPSchemeSrc(const nsAString& aScheme);
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virtual ~nsCSPSchemeSrc();
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bool permits(nsIURI* aUri, const nsAString& aNonce, bool aWasRedirected,
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bool aReportOnly, bool aUpgradeInsecure) const;
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bool visit(nsCSPSrcVisitor* aVisitor) const;
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void toString(nsAString& outStr) const;
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inline void getScheme(nsAString& outStr) const
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{ outStr.Assign(mScheme); };
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private:
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nsString mScheme;
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};
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/* =============== nsCSPHostSrc ============== */
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class nsCSPHostSrc : public nsCSPBaseSrc {
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public:
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explicit nsCSPHostSrc(const nsAString& aHost);
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virtual ~nsCSPHostSrc();
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bool permits(nsIURI* aUri, const nsAString& aNonce, bool aWasRedirected,
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bool aReportOnly, bool aUpgradeInsecure) const;
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bool visit(nsCSPSrcVisitor* aVisitor) const;
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void toString(nsAString& outStr) const;
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void setScheme(const nsAString& aScheme);
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void setPort(const nsAString& aPort);
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void appendPath(const nsAString &aPath);
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inline void getScheme(nsAString& outStr) const
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{ outStr.Assign(mScheme); };
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inline void getHost(nsAString& outStr) const
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{ outStr.Assign(mHost); };
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inline void getPort(nsAString& outStr) const
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{ outStr.Assign(mPort); };
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inline void getPath(nsAString& outStr) const
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{ outStr.Assign(mPath); };
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private:
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nsString mScheme;
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nsString mHost;
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nsString mPort;
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nsString mPath;
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};
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/* =============== nsCSPKeywordSrc ============ */
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class nsCSPKeywordSrc : public nsCSPBaseSrc {
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public:
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explicit nsCSPKeywordSrc(CSPKeyword aKeyword);
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virtual ~nsCSPKeywordSrc();
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bool allows(enum CSPKeyword aKeyword, const nsAString& aHashOrNonce) const;
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bool visit(nsCSPSrcVisitor* aVisitor) const;
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void toString(nsAString& outStr) const;
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void invalidate();
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inline CSPKeyword getKeyword() const
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{ return mKeyword; };
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private:
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CSPKeyword mKeyword;
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// invalidate 'unsafe-inline' if nonce- or hash-source specified
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bool mInvalidated;
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};
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/* =============== nsCSPNonceSource =========== */
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class nsCSPNonceSrc : public nsCSPBaseSrc {
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public:
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explicit nsCSPNonceSrc(const nsAString& aNonce);
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virtual ~nsCSPNonceSrc();
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bool permits(nsIURI* aUri, const nsAString& aNonce, bool aWasRedirected,
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bool aReportOnly, bool aUpgradeInsecure) const;
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bool allows(enum CSPKeyword aKeyword, const nsAString& aHashOrNonce) const;
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bool visit(nsCSPSrcVisitor* aVisitor) const;
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void toString(nsAString& outStr) const;
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inline void getNonce(nsAString& outStr) const
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{ outStr.Assign(mNonce); };
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private:
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nsString mNonce;
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};
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/* =============== nsCSPHashSource ============ */
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class nsCSPHashSrc : public nsCSPBaseSrc {
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public:
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nsCSPHashSrc(const nsAString& algo, const nsAString& hash);
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virtual ~nsCSPHashSrc();
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bool allows(enum CSPKeyword aKeyword, const nsAString& aHashOrNonce) const;
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void toString(nsAString& outStr) const;
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bool visit(nsCSPSrcVisitor* aVisitor) const;
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inline void getAlgorithm(nsAString& outStr) const
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{ outStr.Assign(mAlgorithm); };
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inline void getHash(nsAString& outStr) const
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{ outStr.Assign(mHash); };
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private:
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nsString mAlgorithm;
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nsString mHash;
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};
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/* =============== nsCSPReportURI ============ */
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class nsCSPReportURI : public nsCSPBaseSrc {
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public:
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explicit nsCSPReportURI(nsIURI* aURI);
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virtual ~nsCSPReportURI();
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bool visit(nsCSPSrcVisitor* aVisitor) const;
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void toString(nsAString& outStr) const;
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private:
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nsCOMPtr<nsIURI> mReportURI;
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};
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/* =============== nsCSPSrcVisitor ================== */
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class nsCSPSrcVisitor {
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public:
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virtual bool visitSchemeSrc(const nsCSPSchemeSrc& src) = 0;
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virtual bool visitHostSrc(const nsCSPHostSrc& src) = 0;
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virtual bool visitKeywordSrc(const nsCSPKeywordSrc& src) = 0;
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virtual bool visitNonceSrc(const nsCSPNonceSrc& src) = 0;
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virtual bool visitHashSrc(const nsCSPHashSrc& src) = 0;
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protected:
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explicit nsCSPSrcVisitor() {};
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virtual ~nsCSPSrcVisitor() {};
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};
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/* =============== nsCSPDirective ============= */
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class nsCSPDirective {
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public:
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explicit nsCSPDirective(CSPDirective aDirective);
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virtual ~nsCSPDirective();
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virtual bool permits(nsIURI* aUri, const nsAString& aNonce, bool aWasRedirected,
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bool aReportOnly, bool aUpgradeInsecure) const;
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virtual bool allows(enum CSPKeyword aKeyword, const nsAString& aHashOrNonce) const;
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virtual void toString(nsAString& outStr) const;
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void toDomCSPStruct(mozilla::dom::CSP& outCSP) const;
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virtual void addSrcs(const nsTArray<nsCSPBaseSrc*>& aSrcs)
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{ mSrcs = aSrcs; }
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virtual bool restrictsContentType(nsContentPolicyType aContentType) const;
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inline bool isDefaultDirective() const
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{ return mDirective == nsIContentSecurityPolicy::DEFAULT_SRC_DIRECTIVE; }
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virtual bool equals(CSPDirective aDirective) const;
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void getReportURIs(nsTArray<nsString> &outReportURIs) const;
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bool visitSrcs(nsCSPSrcVisitor* aVisitor) const;
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private:
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CSPDirective mDirective;
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nsTArray<nsCSPBaseSrc*> mSrcs;
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};
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/* =============== nsCSPChildSrcDirective ============= */
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/*
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* In CSP 2, the child-src directive covers both workers and
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* subdocuments (i.e., frames and iframes). Workers were removed
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* from script-src, but frames can be controlled by either child-src
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* or frame-src directives, so child-src needs to know whether it should
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* also restrict frames. When both are present the frame-src directive
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* takes precedent.
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*/
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class nsCSPChildSrcDirective : public nsCSPDirective {
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public:
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explicit nsCSPChildSrcDirective(CSPDirective aDirective);
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virtual ~nsCSPChildSrcDirective();
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void setHandleFrameSrc();
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virtual bool restrictsContentType(nsContentPolicyType aContentType) const;
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virtual bool equals(CSPDirective aDirective) const;
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private:
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bool mHandleFrameSrc;
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};
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/* =============== nsBlockAllMixedContentDirective === */
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class nsBlockAllMixedContentDirective : public nsCSPDirective {
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public:
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explicit nsBlockAllMixedContentDirective(CSPDirective aDirective);
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~nsBlockAllMixedContentDirective();
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bool permits(nsIURI* aUri, const nsAString& aNonce, bool aWasRedirected,
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bool aReportOnly, bool aUpgradeInsecure) const
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{ return false; }
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bool permits(nsIURI* aUri) const
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{ return false; }
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bool allows(enum CSPKeyword aKeyword, const nsAString& aHashOrNonce) const
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{ return false; }
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void toString(nsAString& outStr) const;
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void addSrcs(const nsTArray<nsCSPBaseSrc*>& aSrcs)
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{ MOZ_ASSERT(false, "block-all-mixed-content does not hold any srcs"); }
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};
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/* =============== nsUpgradeInsecureDirective === */
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/*
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* Upgrading insecure requests includes the following actors:
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* (1) CSP:
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* The CSP implementation whitelists the http-request
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* in case the policy is executed in enforcement mode.
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* The CSP implementation however does not allow http
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* requests to succeed if executed in report-only mode.
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* In such a case the CSP implementation reports the
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* error back to the page.
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*
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* (2) MixedContent:
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* The evalution of MixedContent whitelists all http
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* requests with the promise that the http requests
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* gets upgraded to https before any data is fetched
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* from the network.
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*
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* (3) CORS:
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* Does not consider the http request to be of a
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* different origin in case the scheme is the only
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* difference in otherwise matching URIs.
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*
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* (4) nsHttpChannel:
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* Before connecting, the channel gets redirected
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* to use https.
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*
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* (5) WebSocketChannel:
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* Similar to the httpChannel, the websocketchannel
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* gets upgraded from ws to wss.
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*/
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class nsUpgradeInsecureDirective : public nsCSPDirective {
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public:
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explicit nsUpgradeInsecureDirective(CSPDirective aDirective);
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~nsUpgradeInsecureDirective();
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bool permits(nsIURI* aUri, const nsAString& aNonce, bool aWasRedirected,
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bool aReportOnly, bool aUpgradeInsecure) const
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{ return false; }
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bool permits(nsIURI* aUri) const
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{ return false; }
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bool allows(enum CSPKeyword aKeyword, const nsAString& aHashOrNonce) const
|
|
{ return false; }
|
|
|
|
void toString(nsAString& outStr) const;
|
|
|
|
void addSrcs(const nsTArray<nsCSPBaseSrc*>& aSrcs)
|
|
{ MOZ_ASSERT(false, "upgrade-insecure-requests does not hold any srcs"); }
|
|
};
|
|
|
|
/* ===== nsRequireSRIForDirective ========================= */
|
|
|
|
class nsRequireSRIForDirective : public nsCSPDirective {
|
|
public:
|
|
explicit nsRequireSRIForDirective(CSPDirective aDirective);
|
|
~nsRequireSRIForDirective();
|
|
|
|
void toString(nsAString& outStr) const;
|
|
|
|
void addType(nsContentPolicyType aType)
|
|
{ mTypes.AppendElement(aType); }
|
|
bool hasType(nsContentPolicyType aType) const;
|
|
bool restrictsContentType(nsContentPolicyType aType) const;
|
|
bool allows(enum CSPKeyword aKeyword, const nsAString& aHashOrNonce) const;
|
|
|
|
private:
|
|
nsTArray<nsContentPolicyType> mTypes;
|
|
};
|
|
|
|
/* =============== nsCSPPolicy ================== */
|
|
|
|
class nsCSPPolicy {
|
|
public:
|
|
nsCSPPolicy();
|
|
virtual ~nsCSPPolicy();
|
|
|
|
bool permits(CSPDirective aDirective,
|
|
nsIURI* aUri,
|
|
const nsAString& aNonce,
|
|
bool aWasRedirected,
|
|
bool aSpecific,
|
|
nsAString& outViolatedDirective) const;
|
|
bool permits(CSPDirective aDir,
|
|
nsIURI* aUri,
|
|
bool aSpecific) const;
|
|
bool allows(nsContentPolicyType aContentType,
|
|
enum CSPKeyword aKeyword,
|
|
const nsAString& aHashOrNonce) const;
|
|
bool allows(nsContentPolicyType aContentType,
|
|
enum CSPKeyword aKeyword) const;
|
|
void toString(nsAString& outStr) const;
|
|
void toDomCSPStruct(mozilla::dom::CSP& outCSP) const;
|
|
|
|
inline void addDirective(nsCSPDirective* aDir)
|
|
{ mDirectives.AppendElement(aDir); }
|
|
|
|
inline void addUpgradeInsecDir(nsUpgradeInsecureDirective* aDir)
|
|
{
|
|
mUpgradeInsecDir = aDir;
|
|
addDirective(aDir);
|
|
}
|
|
|
|
bool hasDirective(CSPDirective aDir) const;
|
|
|
|
inline void setReportOnlyFlag(bool aFlag)
|
|
{ mReportOnly = aFlag; }
|
|
|
|
inline bool getReportOnlyFlag() const
|
|
{ return mReportOnly; }
|
|
|
|
inline void setReferrerPolicy(const nsAString* aValue)
|
|
{ mReferrerPolicy = *aValue; }
|
|
|
|
inline void getReferrerPolicy(nsAString& outPolicy) const
|
|
{ outPolicy.Assign(mReferrerPolicy); }
|
|
|
|
void getReportURIs(nsTArray<nsString> &outReportURIs) const;
|
|
|
|
void getDirectiveStringForContentType(nsContentPolicyType aContentType,
|
|
nsAString& outDirective) const;
|
|
|
|
void getDirectiveAsString(CSPDirective aDir, nsAString& outDirective) const;
|
|
|
|
bool requireSRIForType(nsContentPolicyType aContentType);
|
|
|
|
inline uint32_t getNumDirectives() const
|
|
{ return mDirectives.Length(); }
|
|
|
|
bool visitDirectiveSrcs(CSPDirective aDir, nsCSPSrcVisitor* aVisitor) const;
|
|
|
|
private:
|
|
nsUpgradeInsecureDirective* mUpgradeInsecDir;
|
|
nsTArray<nsCSPDirective*> mDirectives;
|
|
bool mReportOnly;
|
|
nsString mReferrerPolicy;
|
|
};
|
|
|
|
#endif /* nsCSPUtils_h___ */
|