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| 1 // Copyright (c) 2010 The Chromium Authors. 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 "net/base/pem_tokenizer.h" | |
| 6 | |
| 7 #include "base/base64.h" | |
| 8 #include "base/string_util.h" | |
| 9 | |
| 10 namespace { | |
| 11 | |
| 12 const char kPEMSearchBlock[] = "-----BEGIN "; | |
| 13 const char kPEMBeginBlock[] = "-----BEGIN %s-----"; | |
| 14 const char kPEMEndBlock[] = "-----END %s-----"; | |
| 15 | |
| 16 } // namespace | |
| 17 | |
| 18 namespace net { | |
| 19 | |
| 20 using base::StringPiece; | |
| 21 | |
| 22 PEMTokenizer::PEMTokenizer( | |
| 23 const StringPiece& str, | |
| 24 const std::vector<std::string>& allowed_block_types) { | |
| 25 Init(str, allowed_block_types); | |
| 26 } | |
| 27 | |
| 28 bool PEMTokenizer::GetNext() { | |
| 29 while (pos_ != StringPiece::npos) { | |
| 30 // Scan for the beginning of the next PEM encoded block. | |
| 31 pos_ = str_.find(kPEMSearchBlock, pos_); | |
| 32 if (pos_ == StringPiece::npos) | |
| 33 return false; // No more PEM blocks | |
| 34 | |
| 35 std::vector<PEMType>::const_iterator it; | |
| 36 // Check to see if it is of an acceptable block type. | |
| 37 for (it = block_types_.begin(); it != block_types_.end(); ++it) { | |
| 38 if (!str_.substr(pos_).starts_with(it->header)) | |
| 39 continue; | |
| 40 | |
| 41 // Look for a footer matching the header. If none is found, then all | |
| 42 // data following this point is invalid and should not be parsed. | |
| 43 StringPiece::size_type footer_pos = str_.find(it->footer, pos_); | |
| 44 if (footer_pos == StringPiece::npos) { | |
| 45 pos_ = StringPiece::npos; | |
| 46 return false; | |
| 47 } | |
| 48 | |
| 49 // Chop off the header and footer and parse the data in between. | |
| 50 StringPiece::size_type data_begin = pos_ + it->header.size(); | |
| 51 pos_ = footer_pos + it->footer.size(); | |
| 52 block_type_ = it->type; | |
| 53 | |
| 54 StringPiece encoded = str_.substr(data_begin, | |
| 55 footer_pos - data_begin); | |
| 56 if (!base::Base64Decode(CollapseWhitespaceASCII(encoded.as_string(), | |
| 57 true), &data_)) { | |
| 58 // The most likely cause for a decode failure is a datatype that | |
| 59 // includes PEM headers, which are not supported. | |
| 60 break; | |
| 61 } | |
| 62 | |
| 63 return true; | |
| 64 } | |
| 65 | |
| 66 // If the block did not match any acceptable type, move past it and | |
| 67 // continue the search. Otherwise, |pos_| has been updated to the most | |
| 68 // appropriate search position to continue searching from and should not | |
| 69 // be adjusted. | |
| 70 if (it == block_types_.end()) | |
| 71 pos_ += sizeof(kPEMSearchBlock); | |
| 72 } | |
| 73 | |
| 74 return false; | |
| 75 } | |
| 76 | |
| 77 void PEMTokenizer::Init( | |
| 78 const StringPiece& str, | |
| 79 const std::vector<std::string>& allowed_block_types) { | |
| 80 str_ = str; | |
| 81 pos_ = 0; | |
| 82 | |
| 83 // Construct PEM header/footer strings for all the accepted types, to | |
| 84 // reduce parsing later. | |
| 85 for (std::vector<std::string>::const_iterator it = | |
| 86 allowed_block_types.begin(); it != allowed_block_types.end(); ++it) { | |
| 87 PEMType allowed_type; | |
| 88 allowed_type.type = *it; | |
| 89 allowed_type.header = StringPrintf(kPEMBeginBlock, it->c_str()); | |
| 90 allowed_type.footer = StringPrintf(kPEMEndBlock, it->c_str()); | |
| 91 block_types_.push_back(allowed_type); | |
| 92 } | |
| 93 } | |
| 94 | |
| 95 } // namespace net | |
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Chromium Code Reviews
Issue 2812064:
Revert 52799 - Add support for parsing certificate formats other than raw, DE... (Closed)
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