summaryrefslogtreecommitdiff
path: root/netwerk/protocol/about/nsAboutProtocolHandler.cpp
blob: 998fc71f956e392268f5a53ca6f4cc699dfb5ea8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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 "base/basictypes.h"
#include "mozilla/ArrayUtils.h"

#include "nsAboutProtocolHandler.h"
#include "nsIURI.h"
#include "nsIAboutModule.h"
#include "nsString.h"
#include "nsNetCID.h"
#include "nsAboutProtocolUtils.h"
#include "nsError.h"
#include "nsNetUtil.h"
#include "nsIObjectInputStream.h"
#include "nsIObjectOutputStream.h"
#include "nsAutoPtr.h"
#include "nsIWritablePropertyBag2.h"
#include "nsIChannel.h"
#include "nsIScriptError.h"

namespace mozilla {
namespace net {

static NS_DEFINE_CID(kSimpleURICID,     NS_SIMPLEURI_CID);
static NS_DEFINE_CID(kNestedAboutURICID, NS_NESTEDABOUTURI_CID);

static bool IsSafeForUntrustedContent(nsIAboutModule *aModule, nsIURI *aURI) {
  uint32_t flags;
  nsresult rv = aModule->GetURIFlags(aURI, &flags);
  NS_ENSURE_SUCCESS(rv, false);

  return (flags & nsIAboutModule::URI_SAFE_FOR_UNTRUSTED_CONTENT) != 0;
}

static bool IsSafeToLinkForUntrustedContent(nsIAboutModule *aModule, nsIURI *aURI) {
  uint32_t flags;
  nsresult rv = aModule->GetURIFlags(aURI, &flags);
  NS_ENSURE_SUCCESS(rv, false);

  return (flags & nsIAboutModule::URI_SAFE_FOR_UNTRUSTED_CONTENT) && (flags & nsIAboutModule::MAKE_LINKABLE);
}
////////////////////////////////////////////////////////////////////////////////

NS_IMPL_ISUPPORTS(nsAboutProtocolHandler, nsIProtocolHandler,
    nsIProtocolHandlerWithDynamicFlags, nsISupportsWeakReference)

////////////////////////////////////////////////////////////////////////////////
// nsIProtocolHandler methods:

NS_IMETHODIMP
nsAboutProtocolHandler::GetScheme(nsACString &result)
{
    result.AssignLiteral("about");
    return NS_OK;
}

NS_IMETHODIMP
nsAboutProtocolHandler::GetDefaultPort(int32_t *result)
{
    *result = -1;        // no port for about: URLs
    return NS_OK;
}

NS_IMETHODIMP
nsAboutProtocolHandler::GetProtocolFlags(uint32_t *result)
{
    *result = URI_NORELATIVE | URI_NOAUTH | URI_DANGEROUS_TO_LOAD | URI_SCHEME_NOT_SELF_LINKABLE;
    return NS_OK;
}

NS_IMETHODIMP
nsAboutProtocolHandler::GetFlagsForURI(nsIURI* aURI, uint32_t* aFlags)
{
    // First use the default (which is "unsafe for content"):
    GetProtocolFlags(aFlags);

    // Now try to see if this URI overrides the default:
    nsCOMPtr<nsIAboutModule> aboutMod;
    nsresult rv = NS_GetAboutModule(aURI, getter_AddRefs(aboutMod));
    if (NS_FAILED(rv)) {
      // Swallow this and just tell the consumer the default:
      return NS_OK;
    }
    uint32_t aboutModuleFlags = 0;
    rv = aboutMod->GetURIFlags(aURI, &aboutModuleFlags);
    // This should never happen, so pass back the error:
    NS_ENSURE_SUCCESS(rv, rv);

    // Secure (https) pages can load safe about pages without becoming
    // mixed content.
    if (aboutModuleFlags & nsIAboutModule::URI_SAFE_FOR_UNTRUSTED_CONTENT) {
        *aFlags |= URI_SAFE_TO_LOAD_IN_SECURE_CONTEXT;
        // about: pages can only be loaded by unprivileged principals
        // if they are marked as LINKABLE
        if (aboutModuleFlags & nsIAboutModule::MAKE_LINKABLE) {
            // Replace URI_DANGEROUS_TO_LOAD with URI_LOADABLE_BY_ANYONE.
            *aFlags &= ~URI_DANGEROUS_TO_LOAD;
            *aFlags |= URI_LOADABLE_BY_ANYONE;
        }
    }
    return NS_OK;
}

NS_IMETHODIMP
nsAboutProtocolHandler::NewURI(const nsACString &aSpec,
                               const char *aCharset, // ignore charset info
                               nsIURI *aBaseURI,
                               nsIURI **result)
{
    *result = nullptr;
    nsresult rv;

    // Use a simple URI to parse out some stuff first
    nsCOMPtr<nsIURI> url = do_CreateInstance(kSimpleURICID, &rv);
    if (NS_FAILED(rv)) return rv;

    rv = url->SetSpec(aSpec);
    if (NS_FAILED(rv)) {
        return rv;
    }

    // Unfortunately, people create random about: URIs that don't correspond to
    // about: modules...  Since those URIs will never open a channel, might as
    // well consider them unsafe for better perf, and just in case.
    bool isSafe = false;
    
    nsCOMPtr<nsIAboutModule> aboutMod;
    rv = NS_GetAboutModule(url, getter_AddRefs(aboutMod));
    if (NS_SUCCEEDED(rv)) {
        isSafe = IsSafeToLinkForUntrustedContent(aboutMod, url);
    }

    if (isSafe) {
        // We need to indicate that this baby is safe.  Use an inner URI that
        // no one but the security manager will see.  Make sure to preserve our
        // path, in case someone decides to hardcode checks for particular
        // about: URIs somewhere.
        nsAutoCString spec;
        rv = url->GetPath(spec);
        NS_ENSURE_SUCCESS(rv, rv);
        
        spec.Insert("moz-safe-about:", 0);

        nsCOMPtr<nsIURI> inner;
        rv = NS_NewURI(getter_AddRefs(inner), spec);
        NS_ENSURE_SUCCESS(rv, rv);

        nsSimpleNestedURI* outer = new nsNestedAboutURI(inner, aBaseURI);
        NS_ENSURE_TRUE(outer, NS_ERROR_OUT_OF_MEMORY);

        // Take a ref to it in the COMPtr we plan to return
        url = outer;

        rv = outer->SetSpec(aSpec);
        NS_ENSURE_SUCCESS(rv, rv);
    }

    // We don't want to allow mutation, since it would allow safe and
    // unsafe URIs to change into each other...
    NS_TryToSetImmutable(url);
    url.swap(*result);
    return NS_OK;
}

NS_IMETHODIMP
nsAboutProtocolHandler::NewChannel2(nsIURI* uri,
                                    nsILoadInfo* aLoadInfo,
                                    nsIChannel** result)
{
    NS_ENSURE_ARG_POINTER(uri);

    // about:what you ask?
    nsCOMPtr<nsIAboutModule> aboutMod;
    nsresult rv = NS_GetAboutModule(uri, getter_AddRefs(aboutMod));

    nsAutoCString path;
    nsresult rv2 = NS_GetAboutModuleName(uri, path);
    if (NS_SUCCEEDED(rv2) && path.EqualsLiteral("srcdoc")) {
        // about:srcdoc is meant to be unresolvable, yet is included in the 
        // about lookup tables so that it can pass security checks when used in
        // a srcdoc iframe.  To ensure that it stays unresolvable, we pretend
        // that it doesn't exist.
      rv = NS_ERROR_FACTORY_NOT_REGISTERED;
    }

    if (NS_SUCCEEDED(rv)) {
        // The standard return case:
        rv = aboutMod->NewChannel(uri, aLoadInfo, result);
        if (NS_SUCCEEDED(rv)) {
            // Not all implementations of nsIAboutModule::NewChannel()
            // set the LoadInfo on the newly created channel yet, as
            // an interim solution we set the LoadInfo here if not
            // available on the channel. Bug 1087720
            nsCOMPtr<nsILoadInfo> loadInfo = (*result)->GetLoadInfo();
            if (aLoadInfo != loadInfo) {
                if (loadInfo) {
                    NS_ASSERTION(false,
                        "nsIAboutModule->newChannel(aURI, aLoadInfo) needs to set LoadInfo");
                    const char16_t* params[] = {
                        u"nsIAboutModule->newChannel(aURI)",
                        u"nsIAboutModule->newChannel(aURI, aLoadInfo)"
                    };
                    nsContentUtils::ReportToConsole(
                        nsIScriptError::warningFlag,
                        NS_LITERAL_CSTRING("Security by Default"),
                        nullptr, // aDocument
                        nsContentUtils::eNECKO_PROPERTIES,
                        "APIDeprecationWarning",
                        params, mozilla::ArrayLength(params));
                }
                (*result)->SetLoadInfo(aLoadInfo);
            }

            // If this URI is safe for untrusted content, enforce that its
            // principal be based on the channel's originalURI by setting the
            // owner to null.
            // Note: this relies on aboutMod's newChannel implementation
            // having set the proper originalURI, which probably isn't ideal.
            if (IsSafeForUntrustedContent(aboutMod, uri)) {
                (*result)->SetOwner(nullptr);
            }

            RefPtr<nsNestedAboutURI> aboutURI;
            nsresult rv2 = uri->QueryInterface(kNestedAboutURICID,
                                               getter_AddRefs(aboutURI));
            if (NS_SUCCEEDED(rv2) && aboutURI->GetBaseURI()) {
                nsCOMPtr<nsIWritablePropertyBag2> writableBag =
                    do_QueryInterface(*result);
                if (writableBag) {
                    writableBag->
                        SetPropertyAsInterface(NS_LITERAL_STRING("baseURI"),
                                               aboutURI->GetBaseURI());
                }
            }
        }
        return rv;
    }

    // mumble...

    if (rv == NS_ERROR_FACTORY_NOT_REGISTERED) {
        // This looks like an about: we don't know about.  Convert
        // this to an invalid URI error.
        rv = NS_ERROR_MALFORMED_URI;
    }

    return rv;
}

NS_IMETHODIMP
nsAboutProtocolHandler::NewChannel(nsIURI* uri, nsIChannel* *result)
{
    return NewChannel2(uri, nullptr, result);
}

NS_IMETHODIMP 
nsAboutProtocolHandler::AllowPort(int32_t port, const char *scheme, bool *_retval)
{
    // don't override anything.  
    *_retval = false;
    return NS_OK;
}

////////////////////////////////////////////////////////////////////////////////
// Safe about protocol handler impl

NS_IMPL_ISUPPORTS(nsSafeAboutProtocolHandler, nsIProtocolHandler, nsISupportsWeakReference)

// nsIProtocolHandler methods:

NS_IMETHODIMP
nsSafeAboutProtocolHandler::GetScheme(nsACString &result)
{
    result.AssignLiteral("moz-safe-about");
    return NS_OK;
}

NS_IMETHODIMP
nsSafeAboutProtocolHandler::GetDefaultPort(int32_t *result)
{
    *result = -1;        // no port for moz-safe-about: URLs
    return NS_OK;
}

NS_IMETHODIMP
nsSafeAboutProtocolHandler::GetProtocolFlags(uint32_t *result)
{
    *result = URI_NORELATIVE | URI_NOAUTH | URI_LOADABLE_BY_ANYONE | URI_SAFE_TO_LOAD_IN_SECURE_CONTEXT;
    return NS_OK;
}

NS_IMETHODIMP
nsSafeAboutProtocolHandler::NewURI(const nsACString &aSpec,
                                   const char *aCharset, // ignore charset info
                                   nsIURI *aBaseURI,
                                   nsIURI **result)
{
    nsresult rv;

    nsCOMPtr<nsIURI> url = do_CreateInstance(kSimpleURICID, &rv);
    if (NS_FAILED(rv)) return rv;

    rv = url->SetSpec(aSpec);
    if (NS_FAILED(rv)) {
        return rv;
    }

    NS_TryToSetImmutable(url);
    
    *result = nullptr;
    url.swap(*result);
    return rv;
}

NS_IMETHODIMP
nsSafeAboutProtocolHandler::NewChannel2(nsIURI* uri,
                                        nsILoadInfo* aLoadInfo,
                                        nsIChannel** result)
{
    *result = nullptr;
    return NS_ERROR_NOT_AVAILABLE;
}

NS_IMETHODIMP
nsSafeAboutProtocolHandler::NewChannel(nsIURI* uri, nsIChannel* *result)
{
    *result = nullptr;
    return NS_ERROR_NOT_AVAILABLE;
}

NS_IMETHODIMP 
nsSafeAboutProtocolHandler::AllowPort(int32_t port, const char *scheme, bool *_retval)
{
    // don't override anything.  
    *_retval = false;
    return NS_OK;
}

////////////////////////////////////////////////////////////
// nsNestedAboutURI implementation
NS_INTERFACE_MAP_BEGIN(nsNestedAboutURI)
  if (aIID.Equals(kNestedAboutURICID))
      foundInterface = static_cast<nsIURI*>(this);
  else
NS_INTERFACE_MAP_END_INHERITING(nsSimpleNestedURI)

// nsISerializable
NS_IMETHODIMP
nsNestedAboutURI::Read(nsIObjectInputStream* aStream)
{
    nsresult rv = nsSimpleNestedURI::Read(aStream);
    if (NS_FAILED(rv)) return rv;

    bool haveBase;
    rv = aStream->ReadBoolean(&haveBase);
    if (NS_FAILED(rv)) return rv;

    if (haveBase) {
        nsCOMPtr<nsISupports> supports;
        rv = aStream->ReadObject(true, getter_AddRefs(supports));
        if (NS_FAILED(rv)) return rv;

        mBaseURI = do_QueryInterface(supports, &rv);
        if (NS_FAILED(rv)) return rv;
    }

    return NS_OK;
}

NS_IMETHODIMP
nsNestedAboutURI::Write(nsIObjectOutputStream* aStream)
{
    nsresult rv = nsSimpleNestedURI::Write(aStream);
    if (NS_FAILED(rv)) return rv;

    rv = aStream->WriteBoolean(mBaseURI != nullptr);
    if (NS_FAILED(rv)) return rv;

    if (mBaseURI) {
        // A previous iteration of this code wrote out mBaseURI as nsISupports
        // and then read it in as nsIURI, which is non-kosher when mBaseURI
        // implements more than just a single line of interfaces and the
        // canonical nsISupports* isn't the one a static_cast<> of mBaseURI
        // would produce.  For backwards compatibility with existing
        // serializations we continue to write mBaseURI as nsISupports but
        // switch to reading it as nsISupports, with a post-read QI to get to
        // nsIURI.
        rv = aStream->WriteCompoundObject(mBaseURI, NS_GET_IID(nsISupports),
                                          true);
        if (NS_FAILED(rv)) return rv;
    }

    return NS_OK;
}

// nsSimpleURI
/* virtual */ nsSimpleURI*
nsNestedAboutURI::StartClone(nsSimpleURI::RefHandlingEnum aRefHandlingMode,
                             const nsACString& aNewRef)
{
    // Sadly, we can't make use of nsSimpleNestedURI::StartClone here.
    // However, this function is expected to exactly match that function,
    // aside from the "new ns***URI()" call.
    NS_ENSURE_TRUE(mInnerURI, nullptr);

    nsCOMPtr<nsIURI> innerClone;
    nsresult rv;
    if (aRefHandlingMode == eHonorRef) {
        rv = mInnerURI->Clone(getter_AddRefs(innerClone));
    } else if (aRefHandlingMode == eReplaceRef) {
        rv = mInnerURI->CloneWithNewRef(aNewRef, getter_AddRefs(innerClone));
    } else {
        rv = mInnerURI->CloneIgnoringRef(getter_AddRefs(innerClone));
    }

    if (NS_FAILED(rv)) {
        return nullptr;
    }

    nsNestedAboutURI* url = new nsNestedAboutURI(innerClone, mBaseURI);
    SetRefOnClone(url, aRefHandlingMode, aNewRef);
    url->SetMutable(false);

    return url;
}

// nsIClassInfo
NS_IMETHODIMP
nsNestedAboutURI::GetClassIDNoAlloc(nsCID *aClassIDNoAlloc)
{
    *aClassIDNoAlloc = kNestedAboutURICID;
    return NS_OK;
}

} // namespace net
} // namespace mozilla