| // Copyright (c) 2016 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "net/spdy/header_coalescer.h" |
| |
| #include <memory> |
| #include <string> |
| #include <utility> |
| |
| #include "base/strings/string_util.h" |
| #include "base/strings/stringprintf.h" |
| #include "base/trace_event/memory_usage_estimator.h" |
| #include "base/values.h" |
| #include "net/http/http_log_util.h" |
| #include "net/http/http_util.h" |
| #include "net/log/net_log_values.h" |
| |
| namespace net { |
| namespace { |
| |
| void NetLogInvalidHeader(const NetLogWithSource& net_log, |
| base::StringPiece header_name, |
| base::StringPiece header_value, |
| const char* error_message) { |
| net_log.AddEvent(NetLogEventType::HTTP2_SESSION_RECV_INVALID_HEADER, |
| [&](NetLogCaptureMode capture_mode) { |
| base::DictionaryValue dict; |
| dict.SetKey("header_name", NetLogStringValue(header_name)); |
| dict.SetKey("header_value", |
| NetLogStringValue(ElideHeaderValueForNetLog( |
| capture_mode, header_name.as_string(), |
| header_value.as_string()))); |
| dict.SetString("error", error_message); |
| return dict; |
| }); |
| } |
| |
| bool ContainsUppercaseAscii(base::StringPiece str) { |
| return std::any_of(str.begin(), str.end(), base::IsAsciiUpper<char>); |
| } |
| |
| } // namespace |
| |
| HeaderCoalescer::HeaderCoalescer(uint32_t max_header_list_size, |
| const NetLogWithSource& net_log) |
| : max_header_list_size_(max_header_list_size), net_log_(net_log) {} |
| |
| void HeaderCoalescer::OnHeader(base::StringPiece key, base::StringPiece value) { |
| if (error_seen_) |
| return; |
| if (!AddHeader(key, value)) |
| error_seen_ = true; |
| } |
| |
| spdy::SpdyHeaderBlock HeaderCoalescer::release_headers() { |
| DCHECK(headers_valid_); |
| headers_valid_ = false; |
| return std::move(headers_); |
| } |
| |
| size_t HeaderCoalescer::EstimateMemoryUsage() const { |
| return base::trace_event::EstimateMemoryUsage(headers_); |
| } |
| |
| bool HeaderCoalescer::AddHeader(base::StringPiece key, |
| base::StringPiece value) { |
| if (key.empty()) { |
| NetLogInvalidHeader(net_log_, key, value, "Header name must not be empty."); |
| return false; |
| } |
| |
| base::StringPiece key_name = key; |
| if (key[0] == ':') { |
| if (regular_header_seen_) { |
| NetLogInvalidHeader(net_log_, key, value, |
| "Pseudo header must not follow regular headers."); |
| return false; |
| } |
| key_name.remove_prefix(1); |
| } else if (!regular_header_seen_) { |
| regular_header_seen_ = true; |
| } |
| |
| if (!HttpUtil::IsValidHeaderName(key_name)) { |
| NetLogInvalidHeader(net_log_, key, value, |
| "Invalid character in header name."); |
| return false; |
| } |
| |
| if (ContainsUppercaseAscii(key_name)) { |
| NetLogInvalidHeader(net_log_, key, value, |
| "Upper case characters in header name."); |
| return false; |
| } |
| |
| // 32 byte overhead according to RFC 7540 Section 6.5.2. |
| header_list_size_ += key.size() + value.size() + 32; |
| if (header_list_size_ > max_header_list_size_) { |
| NetLogInvalidHeader(net_log_, key, value, "Header list too large."); |
| return false; |
| } |
| |
| // RFC 7540 Section 10.3: "Any request or response that contains a character |
| // not permitted in a header field value MUST be treated as malformed (Section |
| // 8.1.2.6). Valid characters are defined by the field-content ABNF rule in |
| // Section 3.2 of [RFC7230]." RFC 7230 Section 3.2 says: |
| // field-content = field-vchar [ 1*( SP / HTAB ) field-vchar ] |
| // field-vchar = VCHAR / obs-text |
| // RFC 5234 Appendix B.1 defines |VCHAR|: |
| // VCHAR = %x21-7E |
| // RFC 7230 Section 3.2.6 defines |obs-text|: |
| // obs-text = %x80-FF |
| // Therefore allowed characters are '\t' (HTAB), x20 (SP), x21-7E, and x80-FF. |
| for (const unsigned char c : value) { |
| if (c < '\t' || ('\t' < c && c < 0x20) || c == 0x7f) { |
| std::string error_line; |
| base::StringAppendF(&error_line, |
| "Invalid character 0x%02X in header value.", c); |
| NetLogInvalidHeader(net_log_, key, value, error_line.c_str()); |
| return false; |
| } |
| } |
| |
| headers_.AppendValueOrAddHeader(key, value); |
| return true; |
| } |
| |
| |
| } // namespace net |