path: root/dom/interfaces/security/nsIContentSecurityPolicy.idl

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISerializable.idl"
#include "nsIContentPolicy.idl"

interface nsIURI;
interface nsIEventTarget;
interface nsILoadInfo;
interface nsIPrincipal;
interface nsICSPEventListener;

webidl Element;
webidl Document;

/**
 * nsIContentSecurityPolicy
 * Describes an XPCOM component used to model and enforce CSPs.  Instances of
 * this class may have multiple policies within them, but there should only be
 * one of these per document/principal.
 */

%{C++
class nsCSPPolicy;
%}

[ptr] native CSPPolicyPtr(const nsCSPPolicy);

[scriptable, builtinclass, uuid(1d632008-6c97-48ae-a51c-16e2daa0f4f6)]
interface nsIContentSecurityPolicy : nsISerializable
{
  /**
   * Directives supported by Content Security Policy.  These are enums for
   * the CSPDirective type.
   * The NO_DIRECTIVE entry is  used for checking default permissions and
   * returning failure when asking CSP which directive to check.
   *
   * NOTE: When implementing a new directive, you will need to add it here but also
   * add it to the CSPStrDirectives array in nsCSPUtils.h.
   */
  cenum CSPDirective : 8 {
    NO_DIRECTIVE                   = 0,
    DEFAULT_SRC_DIRECTIVE          = 1,
    SCRIPT_SRC_DIRECTIVE           = 2,
    OBJECT_SRC_DIRECTIVE           = 3,
    STYLE_SRC_DIRECTIVE            = 4,
    IMG_SRC_DIRECTIVE              = 5,
    MEDIA_SRC_DIRECTIVE            = 6,
    FRAME_SRC_DIRECTIVE            = 7,
    FONT_SRC_DIRECTIVE             = 8,
    CONNECT_SRC_DIRECTIVE          = 9,
    REPORT_URI_DIRECTIVE           = 10,
    FRAME_ANCESTORS_DIRECTIVE      = 11,
    REFLECTED_XSS_DIRECTIVE        = 12,
    BASE_URI_DIRECTIVE             = 13,
    FORM_ACTION_DIRECTIVE          = 14,
    WEB_MANIFEST_SRC_DIRECTIVE     = 15,
    UPGRADE_IF_INSECURE_DIRECTIVE  = 16,
    CHILD_SRC_DIRECTIVE            = 17,
    BLOCK_ALL_MIXED_CONTENT        = 18,
    SANDBOX_DIRECTIVE              = 19,
    WORKER_SRC_DIRECTIVE           = 20,
    NAVIGATE_TO_DIRECTIVE          = 21,
    SCRIPT_SRC_ELEM_DIRECTIVE      = 22,
    SCRIPT_SRC_ATTR_DIRECTIVE      = 23,
    STYLE_SRC_ELEM_DIRECTIVE       = 24,
    STYLE_SRC_ATTR_DIRECTIVE       = 25,
  };

  /**
   * Accessor method for a read-only string version of the policy at a given
   * index.
   */
  [binaryname(GetPolicyString)] AString getPolicy(in unsigned long index);

  /**
   * Accessor method for a read-only pointer the policy object at a given
   * index. Returns a null pointer if the index is larger than the current
   * policy count.
   */
  [noscript,notxpcom,nostdcall] CSPPolicyPtr GetPolicy(in unsigned long index);

  /**
   * Returns the number of policies attached to this CSP instance.  Useful with
   * getPolicy().
   */
  readonly attribute unsigned long policyCount;

  /**
   * Returns whether this policy uses the directive upgrade-insecure-requests.
   * Please note that upgrade-insecure-reqeusts also applies if the parent or
   * including document (context) makes use of the directive.
   */
  readonly attribute bool upgradeInsecureRequests;

  /**
   * Returns whether this policy uses the directive block-all-mixed-content.
   * Please note that block-all-mixed-content takes presedence in case the
   * directive upgrade-insecure-requests is defined in the same policy and
   * will therefore block all mixed content without even trying to perform
   * an upgrade.
   */
  readonly attribute bool blockAllMixedContent;

  /**
   * Returns whether this policy enforces the frame-ancestors directive.
   */
  readonly attribute bool enforcesFrameAncestors;

  /**
   * Parse and install a CSP policy.
   * @param aPolicy
   *        String representation of the policy
   *        (e.g., header value, meta content)
   * @param reportOnly
   *        Should this policy affect content, script and style processing or
   *        just send reports if it is violated?
   * @param deliveredViaMetaTag
   *        Indicates whether the policy was delivered via the meta tag.
   */
  void appendPolicy(in AString policyString,
                    in boolean reportOnly,
                    in boolean deliveredViaMetaTag);

  /*
   * Whether this policy allows inline script or style.
   * @param aContentPolicyType Either SCRIPT_SRC_(ELEM|ATTR)_DIRECTIVE or
   *                           STYLE_SRC_(ELEM|ATTR)_DIRECTIVE.
   * @param aHasUnsafeHash Only hash this when the 'unsafe-hashes' directive is
   *                       also specified.
   * @param aNonce The nonce string to check against the policy
   * @param aParserCreated If the script element was created by the HTML Parser
   * @param aTriggeringElement The script element of the inline resource to
   *        hash. It can be null.
   * @param aContentOfPseudoScript The content of the psuedo-script to compare
   *                               to hash (and compare to the hashes listed in
   *                               the policy)
   * @param aLineNumber The line number of the inline resource
   *        (used for reporting)
   * @param aColumnNumber The column number of the inline resource
   *        (used for reporting)
   * @return
   *     Whether or not the effects of the inline style should be allowed
   *     (block the rules if false).
   */
  boolean getAllowsInline(in nsIContentSecurityPolicy_CSPDirective aDirective,
                          in bool aHasUnsafeHash,
                          in AString aNonce,
                          in boolean aParserCreated,
                          in Element aTriggeringElement,
                          in nsICSPEventListener aCSPEventListener,
                          in AString aContentOfPseudoScript,
                          in unsigned long aLineNumber,
                          in unsigned long aColumnNumber);

  /*
   * Whether this policy allows a navigation subject to the navigate-to
   * policy.
   * @param aURI The target URI
   * @param aIsFormSubmission True if the navigation was initiated by a form submission. This
   *        is important since the form-action directive overrides navigate-to in that case.
   * @param aWasRedirect True if a redirect has happened. Important for path-sensitivity.
   * @param aEnforceAllowlist True if the allowlist of allowed targets must be enforced. If
   *        this is true, the allowlist must be enforced even if 'unsafe-allow-redirects' is
   *        used. If 'unsafe-allow-redirects' is not used then the allowlist is always enforced
   * @return
   *     Whether or not the effects of the navigation is allowed
   */
  boolean getAllowsNavigateTo(in nsIURI aURI,
                              in boolean aIsFormSubmission,
                              in boolean aWasRedirected,
                              in boolean aEnforceAllowlist);

  /**
   * Whether this policy allows eval and eval-like functions
   * such as setTimeout("code string", time).
   * @param shouldReportViolations
   *     Whether or not the use of eval should be reported.
   *     This function returns "true" when violating report-only policies, but
   *     when any policy (report-only or otherwise) is violated,
   *     shouldReportViolations is true as well.
   * @return
   *     Whether or not the effects of the eval call should be allowed
   *     (block the call if false).
   */
  boolean getAllowsEval(out boolean shouldReportViolations);

  /**
   * Whether this policy allows the evaluation (and compilation) of
   * WASM code from functions like `WebAssembly.compile`.
  * @param shouldReportViolations
   *     Whether or not the use of WASM evaluation should be reported.
   *     This function returns "true" when violating report-only policies, but
   *     when any policy (report-only or otherwise) is violated,
   *     shouldReportViolations is true as well.
   * @return
   *     Whether or not the effects of the WASM evaluation should be allowed
   *     (block the call if false).
   */
  boolean getAllowsWasmEval(out boolean shouldReportViolations);

  /**
   * Delegate method called by the service when the protected document is loaded.
   * Returns the union of all the sandbox flags contained in CSP policies. This is the most
   * restrictive interpretation of flags set in multiple policies.
   * See nsSandboxFlags.h for the possible flags.
   *
   * @return
   *    sandbox flags or SANDBOXED_NONE if no sandbox directive exists
   */
  uint32_t getCSPSandboxFlags();

  /**
   * For each violated policy (of type violationType), log policy violation on
   * the Error Console and send a report to report-uris present in the violated
   * policies.
   *
   * @param violationType
   *     one of the VIOLATION_TYPE_* constants, e.g. eval or wasm-eval
   * @param triggeringElement
   *     the element that triggers this CSP violation. It can be null.
   * @param sourceFile
   *     name of the source file containing the violation (if available)
   * @param contentSample
   *     sample of the violating content (to aid debugging)
   * @param lineNum
   *     source line number of the violation (if available)
   * @param columnNum
   *     source column number of the violation (if available)
   * @param aNonce
   *     (optional) If this is a nonce violation, include the nonce so we can
   *     recheck to determine which policies were violated and send the
   *     appropriate reports.
   * @param aContent
   *     (optional) If this is a hash violation, include contents of the inline
   *     resource in the question so we can recheck the hash in order to
   *     determine which policies were violated and send the appropriate
   *     reports.
   */
  void logViolationDetails(in unsigned short violationType,
                           in Element triggeringElement,
                           in nsICSPEventListener aCSPEventListener,
                           in AString sourceFile,
                           in AString scriptSample,
                           in int32_t lineNum,
                           in int32_t columnNum,
                           [optional] in AString nonce,
                           [optional] in AString content);

  const unsigned short VIOLATION_TYPE_EVAL                   = 1;
  const unsigned short VIOLATION_TYPE_WASM_EVAL              = 2;

  /**
   * Called after the CSP object is created to fill in appropriate request
   * context. Either use
   *  * aDocument (preferred), or if no document is available, then provide
   *  * aPrincipal, aSelfURI, aReferrer, aInnerWindowId explicitly.
   */
  [must_use] void setRequestContextWithDocument(in Document aDocument);
  [must_use] void setRequestContextWithPrincipal(in nsIPrincipal aRequestPrincipal,
                                                 in nsIURI aSelfURI,
                                                 in AString aReferrer,
                                                 in unsigned long long aInnerWindowId);

  /**
   * Get the various arguments needed to create a new request context for a CSP.
   */
  [noscript, notxpcom, nostdcall] readonly attribute nsIPrincipal requestPrincipal;
  [noscript, notxpcom, nostdcall] readonly attribute nsIURI selfURI;
  [noscript] readonly attribute AString referrer;
  [noscript, notxpcom, nostdcall] readonly attribute unsigned long long innerWindowID;

  /**
   * Warning: Do not set that attribute unless you know exactly what you are doing!
   *
   * Primarily used to allow Devtools to edit inline styles!
   */
  [noscript, notxpcom, nostdcall] attribute boolean skipAllowInlineStyleCheck;

  /**
   *  Ensure we have a nsIEventTarget to use to label CSPReportSenderRunnable
   */
  [noscript] void ensureEventTarget(in nsIEventTarget aEventTarget);


  /**
   * Verifies ancestry as permitted by the policy.
   *
   * NOTE: Calls to this may trigger violation reports when queried, so this
   * value should not be cached.
   *
   * @param aLoadInfo
   *    The loadinfo of the channel containing the protected resource
   * @return
   *    true if the frame's ancestors are all allowed by policy (except for
   *    report-only policies, which will send reports and then return true
   *    here when violated).
   */
  boolean permitsAncestry(in nsILoadInfo aLoadInfo);


  /**
   * Checks if a specific directive permits loading of a URI.
   *
   * @param aTriggeringElement
   *    The element that triggers this CSP check. It can be null.
   * @param aURI
   *    The URI about to be loaded or used.
   * @param aDir
   *    The CSPDirective to query (see above constants *_DIRECTIVE).
   * @param aSpecific
   *    If "true" and the directive is specified to fall back to "default-src"
   *    when it's not explicitly provided, directivePermits will NOT try
   *    default-src when the specific directive is not used.  Setting this to
   *    "false" allows CSP to fall back to default-src.  This function
   *    behaves the same for both values of canUseDefault when querying
   *    directives that don't fall-back.
   * @param aSendViolationReports
   *    If `true` and the uri is not allowed then trigger violation reports.
   *    This should be `false` for caching or preloads.
   * @return
   *    Whether or not the provided URI is allowed by CSP under the given
   *    directive. (block the pending operation if false).
   */
  boolean permits(in Element aTriggeringElement,
                  in nsICSPEventListener aCSPEventListener,
                  in nsIURI aURI,
                  in nsIContentSecurityPolicy_CSPDirective aDir,
                  in boolean aSpecific,
                  in boolean aSendViolationReports);

  /**
   * Delegate method called by the service when sub-elements of the protected
   * document are being loaded.  Given a bit of information about the request,
   * decides whether or not the policy is satisfied.
   *
   * Calls to this may trigger violation reports when queried, so
   * this value should not be cached.
   *
   * aOriginalURIIfRedirect must be passed only if this loading is the result
   * of a redirect. In this case, aOriginalURIIfRedirect must be the original
   * URL.
   */
  short shouldLoad(in nsContentPolicyType aContentType,
                   in nsICSPEventListener aCSPEventListener,
                   in nsIURI          aContentLocation,
                   in nsIURI          aOriginalURIIfRedirect,
                   in bool            aSendViolationReports,
                   in AString         aNonce,
                   in boolean         aParserCreated);

%{ C++
// nsIObserver topic to fire when the policy encounters a violation.
#define CSP_VIOLATION_TOPIC "csp-on-violate-policy"
%}

  /**
   * Returns the CSP in JSON notation.
   */
  AString toJSON();

};

typedef nsIContentSecurityPolicy_CSPDirective CSPDirective;

/* Listener for security policy violation event */
[function, scriptable, uuid(c3163b14-3a8f-46dd-a4af-bd04680364cd)]
interface nsICSPEventListener : nsISupports
{
  // aJSON is the JSON format of SecurityPolicyViolationEventInit dictionary.
  void onCSPViolationEvent(in AString aJSON);
};