src/xwalk/application/common/package/xpk_package.cc

   1 // Copyright (c) 2013 Intel Corporation. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "xwalk/application/common/package/xpk_package.h"
   6
   7 #include "base/file_util.h"
   8 #include "base/files/scoped_file.h"
   9 #include "crypto/signature_verifier.h"
  10 #include "xwalk/application/common/id_util.h"
  11
  12 namespace xwalk {
  13 namespace application {
  14
  15 const uint8 kSignatureAlgorithm[15] = {
  16   0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86,
  17   0xf7, 0x0d, 0x01, 0x01, 0x05, 0x05, 0x00
  18 };
  19
  20 const char XPKPackage::kXPKPackageHeaderMagic[] = "CrWk";
  21
  22 XPKPackage::~XPKPackage() {
  23 }
  24
  25 XPKPackage::XPKPackage(const base::FilePath& path)
  26   : Package(path) {
  27   if (!base::PathExists(path))
  28     return;
  29   type_ = XPK;
  30   scoped_ptr<base::ScopedFILE> file(
  31       new base::ScopedFILE(base::OpenFile(path, "rb")));
  32   file_ = file.Pass();
  33   size_t len = fread(&header_, 1, sizeof(header_), file_->get());
  34   is_valid_ = false;
  35   if (len < sizeof(header_))
  36     return;
  37   if (!strncmp(XPKPackage::kXPKPackageHeaderMagic,
  38                header_.magic,
  39                sizeof(header_.magic)) &&
  40       header_.key_size > 0 &&
  41       header_.key_size <= XPKPackage::kMaxPublicKeySize &&
  42       header_.signature_size > 0 &&
  43       header_.signature_size <= XPKPackage::kMaxSignatureKeySize) {
  44       is_valid_ = true;
  45       zip_addr_ = sizeof(header_) + header_.key_size + header_.signature_size;
  46         fseek(file_->get(), sizeof(header_), SEEK_SET);
  47         key_.resize(header_.key_size);
  48         size_t len = fread(
  49             &key_.front(), sizeof(uint8), header_.key_size, file_->get());
  50         if (len < header_.key_size)
  51           is_valid_ = false;
  52
  53         signature_.resize(header_.signature_size);
  54         len = fread(&signature_.front(),
  55                     sizeof(uint8),
  56                     header_.signature_size,
  57                     file_->get());
  58         if (len < header_.signature_size)
  59           is_valid_ = false;
  60
  61         if (!VerifySignature())
  62           is_valid_ = false;
  63
  64         std::string public_key =
  65             std::string(reinterpret_cast<char*>(&key_.front()), key_.size());
  66         id_ = GenerateId(public_key);
  67   }
  68 }
  69
  70 bool XPKPackage::VerifySignature() {
  71 // Set the file read position to the beginning of compressed resource file,
  72 // which is behind the magic header, public key and signature key.
  73   fseek(file_->get(), zip_addr_, SEEK_SET);
  74   crypto::SignatureVerifier verifier;
  75   if (!verifier.VerifyInit(kSignatureAlgorithm,
  76                            sizeof(kSignatureAlgorithm),
  77                            &signature_.front(),
  78                            signature_.size(),
  79                            &key_.front(),
  80                            key_.size()))
  81     return false;
  82   unsigned char buf[1 << 12];
  83   size_t len = 0;
  84   while ((len = fread(buf, 1, sizeof(buf), file_->get())) > 0)
  85     verifier.VerifyUpdate(buf, len);
  86   if (!verifier.VerifyFinal())
  87     return false;
  88
  89   return true;
  90 }
  91
  92 bool XPKPackage::ExtractToTemporaryDir(base::FilePath* target_path) {
  93   if (is_extracted_) {
  94     *target_path = temp_dir_.path();
  95     return true;
  96   }
  97
  98   if (!IsValid()) {
  99     LOG(ERROR) << "The XPK file is not valid.";
 100     return false;
 101   }
 102
 103   return Package::ExtractToTemporaryDir(target_path);
 104 }
 105
 106 }  // namespace application
 107 }  // namespace xwalk