summaryrefslogtreecommitdiffstats
path: root/dom/media/gmp/GMPLoader.cpp
blob: c10208a49bea0269c903e124cc8a0042ebc3bb32 (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
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: sw=4 ts=4 et :
 * 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 "GMPLoader.h"
#include <stdio.h>
#include "mozilla/Attributes.h"
#include "gmp-entrypoints.h"
#include "prlink.h"
#include "prenv.h"

#include <string>

#ifdef XP_WIN
#include "windows.h"
#endif

#include "GMPDeviceBinding.h"

namespace mozilla {
namespace gmp {

class GMPLoaderImpl : public GMPLoader {
public:
  explicit GMPLoaderImpl(SandboxStarter* aStarter)
    : mSandboxStarter(aStarter)
    , mAdapter(nullptr)
  {}
  virtual ~GMPLoaderImpl() {}

  bool Load(const char* aUTF8LibPath,
            uint32_t aUTF8LibPathLen,
            char* aOriginSalt,
            uint32_t aOriginSaltLen,
            const GMPPlatformAPI* aPlatformAPI,
            GMPAdapter* aAdapter) override;

  GMPErr GetAPI(const char* aAPIName,
                void* aHostAPI,
                void** aPluginAPI,
                uint32_t aDecryptorId) override;

  void Shutdown() override;

#if defined(XP_MACOSX) && defined(MOZ_GMP_SANDBOX)
  void SetSandboxInfo(MacSandboxInfo* aSandboxInfo) override;
#endif

private:
  SandboxStarter* mSandboxStarter;
  UniquePtr<GMPAdapter> mAdapter;
};

UniquePtr<GMPLoader> CreateGMPLoader(SandboxStarter* aStarter) {
  return MakeUnique<GMPLoaderImpl>(aStarter);
}

class PassThroughGMPAdapter : public GMPAdapter {
public:
  ~PassThroughGMPAdapter() {
    // Ensure we're always shutdown, even if caller forgets to call GMPShutdown().
    GMPShutdown();
  }

  void SetAdaptee(PRLibrary* aLib) override
  {
    mLib = aLib;
  }

  GMPErr GMPInit(const GMPPlatformAPI* aPlatformAPI) override
  {
    if (!mLib) {
      return GMPGenericErr;
    }
    GMPInitFunc initFunc = reinterpret_cast<GMPInitFunc>(PR_FindFunctionSymbol(mLib, "GMPInit"));
    if (!initFunc) {
      return GMPNotImplementedErr;
    }
    return initFunc(aPlatformAPI);
  }

  GMPErr GMPGetAPI(const char* aAPIName,
                   void* aHostAPI,
                   void** aPluginAPI,
                   uint32_t aDecryptorId) override
  {
    if (!mLib) {
      return GMPGenericErr;
    }
    GMPGetAPIFunc getapiFunc = reinterpret_cast<GMPGetAPIFunc>(PR_FindFunctionSymbol(mLib, "GMPGetAPI"));
    if (!getapiFunc) {
      return GMPNotImplementedErr;
    }
    return getapiFunc(aAPIName, aHostAPI, aPluginAPI);
  }

  void GMPShutdown() override
  {
    if (mLib) {
      GMPShutdownFunc shutdownFunc = reinterpret_cast<GMPShutdownFunc>(PR_FindFunctionSymbol(mLib, "GMPShutdown"));
      if (shutdownFunc) {
        shutdownFunc();
      }
      PR_UnloadLibrary(mLib);
      mLib = nullptr;
    }
  }

  void GMPSetNodeId(const char* aNodeId, uint32_t aLength) override
  {
    if (!mLib) {
      return;
    }
    GMPSetNodeIdFunc setNodeIdFunc = reinterpret_cast<GMPSetNodeIdFunc>(PR_FindFunctionSymbol(mLib, "GMPSetNodeId"));
    if (setNodeIdFunc) {
      setNodeIdFunc(aNodeId, aLength);
    }
  }

private:
  PRLibrary* mLib = nullptr;
};

bool
GMPLoaderImpl::Load(const char* aUTF8LibPath,
                    uint32_t aUTF8LibPathLen,
                    char* aOriginSalt,
                    uint32_t aOriginSaltLen,
                    const GMPPlatformAPI* aPlatformAPI,
                    GMPAdapter* aAdapter)
{
  std::string nodeId;
  if (!CalculateGMPDeviceId(aOriginSalt, aOriginSaltLen, nodeId)) {
    return false;
  }

  // Start the sandbox now that we've generated the device bound node id.
  // This must happen after the node id is bound to the device id, as
  // generating the device id requires privileges.
  if (mSandboxStarter && !mSandboxStarter->Start(aUTF8LibPath)) {
    return false;
  }

  // Load the GMP.
  PRLibSpec libSpec;
#ifdef XP_WIN
  int pathLen = MultiByteToWideChar(CP_UTF8, 0, aUTF8LibPath, -1, nullptr, 0);
  if (pathLen == 0) {
    return false;
  }

  auto widePath = MakeUnique<wchar_t[]>(pathLen);
  if (MultiByteToWideChar(CP_UTF8, 0, aUTF8LibPath, -1, widePath.get(), pathLen) == 0) {
    return false;
  }

  libSpec.value.pathname_u = widePath.get();
  libSpec.type = PR_LibSpec_PathnameU;
#else
  libSpec.value.pathname = aUTF8LibPath;
  libSpec.type = PR_LibSpec_Pathname;
#endif
  PRLibrary* lib = PR_LoadLibraryWithFlags(libSpec, 0);
  if (!lib) {
    return false;
  }

  GMPInitFunc initFunc = reinterpret_cast<GMPInitFunc>(PR_FindFunctionSymbol(lib, "GMPInit"));
  if ((initFunc && aAdapter) ||
      (!initFunc && !aAdapter)) {
    // Ensure that if we're dealing with a GMP we do *not* use an adapter
    // provided from the outside world. This is important as it means we
    // don't call code not covered by Adobe's plugin-container voucher
    // before we pass the node Id to Adobe's GMP.
    return false;
  }

  // Note: PassThroughGMPAdapter's code must remain in this file so that it's
  // covered by Adobe's plugin-container voucher.
  mAdapter.reset((!aAdapter) ? new PassThroughGMPAdapter() : aAdapter);
  mAdapter->SetAdaptee(lib);

  if (mAdapter->GMPInit(aPlatformAPI) != GMPNoErr) {
    return false;
  }

  mAdapter->GMPSetNodeId(nodeId.c_str(), nodeId.size());

  return true;
}

GMPErr
GMPLoaderImpl::GetAPI(const char* aAPIName,
                      void* aHostAPI,
                      void** aPluginAPI,
                      uint32_t aDecryptorId)
{
  return mAdapter->GMPGetAPI(aAPIName, aHostAPI, aPluginAPI, aDecryptorId);
}

void
GMPLoaderImpl::Shutdown()
{
  if (mAdapter) {
    mAdapter->GMPShutdown();
  }
}

#if defined(XP_MACOSX) && defined(MOZ_GMP_SANDBOX)
void
GMPLoaderImpl::SetSandboxInfo(MacSandboxInfo* aSandboxInfo)
{
  if (mSandboxStarter) {
    mSandboxStarter->SetSandboxInfo(aSandboxInfo);
  }
}
#endif
} // namespace gmp
} // namespace mozilla