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105 lines
3.2 KiB
C++
105 lines
3.2 KiB
C++
// Copyright (c) 2010 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "net/cert/pem_tokenizer.h"
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#include "base/base64.h"
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#include "base/strings/string_util.h"
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#include "base/strings/stringprintf.h"
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namespace {
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const char kPEMSearchBlock[] = "-----BEGIN ";
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const char kPEMBeginBlock[] = "-----BEGIN %s-----";
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const char kPEMEndBlock[] = "-----END %s-----";
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} // namespace
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namespace net {
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using base::StringPiece;
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struct PEMTokenizer::PEMType {
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std::string type;
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std::string header;
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std::string footer;
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};
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PEMTokenizer::PEMTokenizer(
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const StringPiece& str,
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const std::vector<std::string>& allowed_block_types) {
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Init(str, allowed_block_types);
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}
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PEMTokenizer::~PEMTokenizer() = default;
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bool PEMTokenizer::GetNext() {
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while (pos_ != StringPiece::npos) {
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// Scan for the beginning of the next PEM encoded block.
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pos_ = str_.find(kPEMSearchBlock, pos_);
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if (pos_ == StringPiece::npos)
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return false; // No more PEM blocks
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std::vector<PEMType>::const_iterator it;
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// Check to see if it is of an acceptable block type.
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for (it = block_types_.begin(); it != block_types_.end(); ++it) {
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if (!str_.substr(pos_).starts_with(it->header))
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continue;
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// Look for a footer matching the header. If none is found, then all
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// data following this point is invalid and should not be parsed.
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StringPiece::size_type footer_pos = str_.find(it->footer, pos_);
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if (footer_pos == StringPiece::npos) {
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pos_ = StringPiece::npos;
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return false;
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}
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// Chop off the header and footer and parse the data in between.
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StringPiece::size_type data_begin = pos_ + it->header.size();
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pos_ = footer_pos + it->footer.size();
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block_type_ = it->type;
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StringPiece encoded = str_.substr(data_begin,
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footer_pos - data_begin);
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if (!base::Base64Decode(base::CollapseWhitespaceASCII(encoded.as_string(),
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true), &data_)) {
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// The most likely cause for a decode failure is a datatype that
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// includes PEM headers, which are not supported.
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break;
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}
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return true;
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}
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// If the block did not match any acceptable type, move past it and
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// continue the search. Otherwise, |pos_| has been updated to the most
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// appropriate search position to continue searching from and should not
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// be adjusted.
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if (it == block_types_.end())
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pos_ += sizeof(kPEMSearchBlock);
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}
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return false;
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}
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void PEMTokenizer::Init(
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const StringPiece& str,
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const std::vector<std::string>& allowed_block_types) {
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str_ = str;
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pos_ = 0;
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// Construct PEM header/footer strings for all the accepted types, to
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// reduce parsing later.
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for (std::vector<std::string>::const_iterator it =
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allowed_block_types.begin(); it != allowed_block_types.end(); ++it) {
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PEMType allowed_type;
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allowed_type.type = *it;
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allowed_type.header = base::StringPrintf(kPEMBeginBlock, it->c_str());
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allowed_type.footer = base::StringPrintf(kPEMEndBlock, it->c_str());
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block_types_.push_back(allowed_type);
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}
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}
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} // namespace net
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