caps/nsIPrincipal.idl

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 /* Defines the abstract interface for a principal. */
   7
   8 #include "nsISerializable.idl"
   9
  10 %{C++
  11 struct JSPrincipals;
  12 #include "nsCOMPtr.h"
  13 #include "nsTArray.h"
  14 %}
  15
  16 interface nsIURI;
  17 interface nsIContentSecurityPolicy;
  18
  19 [ptr] native JSContext(JSContext);
  20 [ptr] native JSPrincipals(JSPrincipals);
  21 [ptr] native PrincipalArray(nsTArray<nsCOMPtr<nsIPrincipal> >);
  22
  23 [scriptable, builtinclass, uuid(204555e7-04ad-4cc8-9f0e-840615cc43e8)]
  24 interface nsIPrincipal : nsISerializable
  25 {
  26     /**
  27      * Returns whether the other principal is equivalent to this principal.
  28      * Principals are considered equal if they are the same principal, or
  29      * they have the same origin.
  30      */
  31     boolean equals(in nsIPrincipal other);
  32
  33     /**
  34      * Like equals, but takes document.domain changes into account.
  35      */
  36     boolean equalsConsideringDomain(in nsIPrincipal other);
  37
  38     %{C++
  39     inline bool Equals(nsIPrincipal* aOther) {
  40       bool equal = false;
  41       return NS_SUCCEEDED(Equals(aOther, &equal)) && equal;
  42     }
  43
  44     inline bool EqualsConsideringDomain(nsIPrincipal* aOther) {
  45       bool equal = false;
  46       return NS_SUCCEEDED(EqualsConsideringDomain(aOther, &equal)) && equal;
  47     }
  48     %}
  49
  50     /**
  51      * Returns a hash value for the principal.
  52      */
  53     [noscript] readonly attribute unsigned long hashValue;
  54
  55     /**
  56      * The codebase URI to which this principal pertains.  This is
  57      * generally the document URI.
  58      */
  59     readonly attribute nsIURI URI;
  60
  61     /**
  62      * The domain URI to which this principal pertains.
  63      * This is congruent with HTMLDocument.domain, and may be null.
  64      * Setting this has no effect on the URI.
  65      */
  66     [noscript] attribute nsIURI domain;
  67
  68     /**
  69      * The origin of this principal's codebase URI.
  70      * An origin is defined as: scheme + host + port.
  71      */
  72     // XXXcaa this should probably be turned into an nsIURI.
  73     // The system principal's origin should be some caps namespace
  74     // with a chrome URI.  All of chrome should probably be the same.
  75     readonly attribute string origin;
  76
  77     /**
  78      * Returns whether the other principal is equal to or weaker than this
  79      * principal. Principals are equal if they are the same object or they
  80      * have the same origin.
  81      *
  82      * Thus a principal always subsumes itself.
  83      *
  84      * The system principal subsumes itself and all other principals.
  85      *
  86      * A null principal (corresponding to an unknown, hence assumed minimally
  87      * privileged, security context) is not equal to any other principal
  88      * (including other null principals), and therefore does not subsume
  89      * anything but itself.
  90      */
  91     boolean subsumes(in nsIPrincipal other);
  92
  93     /**
  94      * Same as the previous method, subsumes(), but takes document.domain into
  95      * account.
  96      */
  97     boolean subsumesConsideringDomain(in nsIPrincipal other);
  98
  99     %{C++
 100     inline bool Subsumes(nsIPrincipal* aOther) {
 101       bool subsumes = false;
 102       return NS_SUCCEEDED(Subsumes(aOther, &subsumes)) && subsumes;
 103     }
 104
 105     inline bool SubsumesConsideringDomain(nsIPrincipal* aOther) {
 106       bool subsumes = false;
 107       return NS_SUCCEEDED(SubsumesConsideringDomain(aOther, &subsumes)) && subsumes;
 108     }
 109     %}
 110
 111     /**
 112      * Checks whether this principal is allowed to load the network resource
 113      * located at the given URI under the same-origin policy. This means that
 114      * codebase principals are only allowed to load resources from the same
 115      * domain, the system principal is allowed to load anything, and null
 116      * principals are not allowed to load anything. This is changed slightly
 117      * by the optional flag allowIfInheritsPrincipal (which defaults to false)
 118      * which allows the load of a data: URI (which inherits the principal of
 119      * its loader) or a URI with the same principal as its loader (eg. a
 120      * Blob URI).
 121      * In these cases, with allowIfInheritsPrincipal set to true, the URI can
 122      * be loaded by a null principal.
 123      *
 124      * If the load is allowed this function does nothing. If the load is not
 125      * allowed the function throws NS_ERROR_DOM_BAD_URI.
 126      *
 127      * NOTE: Other policies might override this, such as the Access-Control
 128      *       specification.
 129      * NOTE: The 'domain' attribute has no effect on the behaviour of this
 130      *       function.
 131      *
 132      *
 133      * @param uri    The URI about to be loaded.
 134      * @param report If true, will report a warning to the console service
 135      *               if the load is not allowed.
 136      * @param allowIfInheritsPrincipal   If true, the load is allowed if the
 137      *                                   loadee inherits the principal of the
 138      *                                   loader.
 139      * @throws NS_ERROR_DOM_BAD_URI if the load is not allowed.
 140      */
 141     void checkMayLoad(in nsIURI uri, in boolean report,
 142                       in boolean allowIfInheritsPrincipal);
 143
 144     /**
 145      * A Content Security Policy associated with this principal.
 146      */
 147     [noscript] attribute nsIContentSecurityPolicy csp;
 148
 149     /**
 150      * Returns the jar prefix of the principal.
 151      * The jar prefix is a string that can be used to isolate data or
 152      * permissions between different principals while taking into account
 153      * parameters like the app id or the fact that the principal is embedded in
 154      * a mozbrowser.
 155      * Some principals will return an empty string.
 156      * Some principals will assert if you try to access the jarPrefix.
 157      *
 158      * The jarPrefix is intended to be an opaque identifier. It is currently
 159      * "human-readable" but no callers should assume it will stay as is and
 160      * it might be crypto-hashed at some point.
 161      */
 162     readonly attribute AUTF8String jarPrefix;
 163
 164     /**
 165      * The base domain of the codebase URI to which this principal pertains
 166      * (generally the document URI), handling null principals and
 167      * non-hierarchical schemes correctly.
 168      */
 169     readonly attribute ACString baseDomain;
 170
 171     const short APP_STATUS_NOT_INSTALLED = 0;
 172     const short APP_STATUS_INSTALLED     = 1;
 173     const short APP_STATUS_PRIVILEGED    = 2;
 174     const short APP_STATUS_CERTIFIED     = 3;
 175
 176     /**
 177      * Gets the principal's app status, which indicates whether the principal
 178      * corresponds to "app code", and if it does, how privileged that code is.
 179      * This method returns one of the APP_STATUS constants above.
 180      *
 181      * Note that a principal may have
 182      *
 183      *   appId != nsIScriptSecurityManager::NO_APP_ID &&
 184      *   appId != nsIScriptSecurityManager::UNKNOWN_APP_ID
 185      *
 186      * and still have appStatus == APP_STATUS_NOT_INSTALLED.  That's because
 187      * appId identifies the app that contains this principal, but a window
 188      * might be contained in an app and not be running code that the app has
 189      * vouched for.  For example, the window might be inside an <iframe
 190      * mozbrowser>, or the window's origin might not match the app's origin.
 191      *
 192      * If you're doing a check to determine "does this principal correspond to
 193      * app code?", you must check appStatus; checking appId != NO_APP_ID is not
 194      * sufficient.
 195      */
 196     [infallible] readonly attribute unsigned short appStatus;
 197
 198     /**
 199      * Gets the id of the app this principal is inside.  If this principal is
 200      * not inside an app, returns nsIScriptSecurityManager::NO_APP_ID.
 201      *
 202      * Note that this principal does not necessarily have the permissions of
 203      * the app identified by appId.  For example, this principal might
 204      * correspond to an iframe whose origin differs from that of the app frame
 205      * containing it.  In this case, the iframe will have the appId of its
 206      * containing app frame, but the iframe must not run with the app's
 207      * permissions.
 208      *
 209      * Similarly, this principal might correspond to an <iframe mozbrowser>
 210      * inside an app frame; in this case, the content inside the iframe should
 211      * not have any of the app's permissions, even if the iframe is at the same
 212      * origin as the app.
 213      *
 214      * If you're doing a security check based on appId, you must check
 215      * appStatus as well.
 216      */
 217     [infallible] readonly attribute unsigned long appId;
 218
 219     /**
 220      * Returns true iff the principal is inside a browser element.  (<iframe
 221      * mozbrowser mozapp> does not count as a browser element.)
 222      */
 223     [infallible] readonly attribute boolean isInBrowserElement;
 224
 225     /**
 226      * Returns true if this principal has an unknown appId. This shouldn't
 227      * generally be used. We only expose it due to not providing the correct
 228      * appId everywhere where we construct principals.
 229      */
 230     [infallible] readonly attribute boolean unknownAppId;
 231
 232     /**
 233      * Returns true iff this principal is a null principal (corresponding to an
 234      * unknown, hence assumed minimally privileged, security context).
 235      */
 236     [infallible] readonly attribute boolean isNullPrincipal;
 237 };
 238
 239 /**
 240  * If nsSystemPrincipal is too risky to use, but we want a principal to access
 241  * more than one origin, nsExpandedPrincipals letting us define an array of
 242  * principals it subsumes. So script with an nsExpandedPrincipals will gain
 243  * same origin access when at least one of its principals it contains gained
 244  * sameorigin acccess. An nsExpandedPrincipal will be subsumed by the system
 245  * principal, and by another nsExpandedPrincipal that has all its principals.
 246  * It is added for jetpack content-scripts to let them interact with the
 247  * content and a well defined set of other domains, without the risk of
 248  * leaking out a system principal to the content. See: Bug 734891
 249  */
 250 [uuid(f3e177Df-6a5e-489f-80a7-2dd1481471d8)]
 251 interface nsIExpandedPrincipal : nsISupports
 252 {
 253   /**
 254    * An array of principals that the expanded principal subsumes.
 255    * Note: this list is not reference counted, it is shared, so
 256    * should not be changed and should only be used ephemerally.
 257    */
 258   [noscript] readonly attribute PrincipalArray whiteList;
 259 };