| /* |
| * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org) |
| * Copyright (C) 2006-2017 Apple Inc. All rights reserved. |
| * Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/ |
| * Copyright (C) 2009 Google Inc. All rights reserved. |
| * Copyright (C) 2011 Apple Inc. All Rights Reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of Apple Inc. ("Apple") nor the names of |
| * its contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "HTTPParsers.h" |
| |
| #include "HTTPHeaderField.h" |
| #include "HTTPHeaderNames.h" |
| #include "ParsedContentType.h" |
| #include <wtf/DateMath.h> |
| #include <wtf/Language.h> |
| #include <wtf/NeverDestroyed.h> |
| #include <wtf/Optional.h> |
| #include <wtf/text/StringBuilder.h> |
| #include <wtf/unicode/CharacterNames.h> |
| |
| |
| namespace WebCore { |
| |
| // True if characters which satisfy the predicate are present, incrementing |
| // "pos" to the next character which does not satisfy the predicate. |
| // Note: might return pos == str.length(). |
| static inline bool skipWhile(const String& str, unsigned& pos, const WTF::Function<bool(const UChar)>& predicate) |
| { |
| const unsigned start = pos; |
| const unsigned len = str.length(); |
| while (pos < len && predicate(str[pos])) |
| ++pos; |
| return pos != start; |
| } |
| |
| // true if there is more to parse, after incrementing pos past whitespace. |
| // Note: Might return pos == str.length() |
| static inline bool skipWhiteSpace(const String& str, unsigned& pos) |
| { |
| skipWhile(str, pos, RFC7230::isWhitespace); |
| return pos < str.length(); |
| } |
| |
| // Returns true if the function can match the whole token (case insensitive) |
| // incrementing pos on match, otherwise leaving pos unchanged. |
| // Note: Might return pos == str.length() |
| static inline bool skipToken(const String& str, unsigned& pos, const char* token) |
| { |
| unsigned len = str.length(); |
| unsigned current = pos; |
| |
| while (current < len && *token) { |
| if (toASCIILower(str[current]) != *token++) |
| return false; |
| ++current; |
| } |
| |
| if (*token) |
| return false; |
| |
| pos = current; |
| return true; |
| } |
| |
| // True if the expected equals sign is seen and there is more to follow. |
| static inline bool skipEquals(const String& str, unsigned &pos) |
| { |
| return skipWhiteSpace(str, pos) && str[pos++] == '=' && skipWhiteSpace(str, pos); |
| } |
| |
| // True if a value present, incrementing pos to next space or semicolon, if any. |
| // Note: might return pos == str.length(). |
| static inline bool skipValue(const String& str, unsigned& pos) |
| { |
| unsigned start = pos; |
| unsigned len = str.length(); |
| while (pos < len) { |
| if (str[pos] == ' ' || str[pos] == '\t' || str[pos] == ';') |
| break; |
| ++pos; |
| } |
| return pos != start; |
| } |
| |
| // See RFC 7230, Section 3.1.2. |
| bool isValidReasonPhrase(const String& value) |
| { |
| for (unsigned i = 0; i < value.length(); ++i) { |
| UChar c = value[i]; |
| if (c == 0x7F || !isLatin1(c) || (c < 0x20 && c != '\t')) |
| return false; |
| } |
| return true; |
| } |
| |
| // See https://fetch.spec.whatwg.org/#concept-header |
| bool isValidHTTPHeaderValue(const String& value) |
| { |
| UChar c = value[0]; |
| if (c == ' ' || c == '\t') |
| return false; |
| c = value[value.length() - 1]; |
| if (c == ' ' || c == '\t') |
| return false; |
| for (unsigned i = 0; i < value.length(); ++i) { |
| c = value[i]; |
| ASSERT(isLatin1(c)); |
| if (c == 0x00 || c == 0x0A || c == 0x0D) |
| return false; |
| } |
| return true; |
| } |
| |
| // See RFC 7231, Section 5.3.2. |
| bool isValidAcceptHeaderValue(const String& value) |
| { |
| for (unsigned i = 0; i < value.length(); ++i) { |
| UChar c = value[i]; |
| |
| // First check for alphanumeric for performance reasons then whitelist four delimiter characters. |
| if (isASCIIAlphanumeric(c) || c == ',' || c == '/' || c == ';' || c == '=') |
| continue; |
| |
| ASSERT(isLatin1(c)); |
| if (c == 0x7F || (c < 0x20 && c != '\t')) |
| return false; |
| |
| if (RFC7230::isDelimiter(c)) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| static bool containsCORSUnsafeRequestHeaderBytes(const String& value) |
| { |
| for (unsigned i = 0; i < value.length(); ++i) { |
| UChar c = value[i]; |
| // https://fetch.spec.whatwg.org/#cors-unsafe-request-header-byte |
| if ((c < 0x20 && c != '\t') || (c == '"' || c == '(' || c == ')' || c == ':' || c == '<' || c == '>' || c == '?' |
| || c == '@' || c == '[' || c == '\\' || c == ']' || c == 0x7B || c == '{' || c == '}' || c == 0x7F)) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| // See RFC 7231, Section 5.3.5 and 3.1.3.2. |
| bool isValidLanguageHeaderValue(const String& value) |
| { |
| for (unsigned i = 0; i < value.length(); ++i) { |
| UChar c = value[i]; |
| if (isASCIIAlphanumeric(c) || c == ' ' || c == '*' || c == ',' || c == '-' || c == '.' || c == ';' || c == '=') |
| continue; |
| return false; |
| } |
| |
| // FIXME: Validate further by splitting into language tags and optional quality |
| // values (q=) and then check each language tag. |
| // Language tags https://tools.ietf.org/html/rfc7231#section-3.1.3.1 |
| // Language tag syntax https://tools.ietf.org/html/bcp47#section-2.1 |
| return true; |
| } |
| |
| // See RFC 7230, Section 3.2.6. |
| bool isValidHTTPToken(const String& value) |
| { |
| if (value.isEmpty()) |
| return false; |
| auto valueStringView = StringView(value); |
| for (UChar c : valueStringView.codeUnits()) { |
| if (!RFC7230::isTokenCharacter(c)) |
| return false; |
| } |
| return true; |
| } |
| |
| // True if the character at the given position satisifies a predicate, incrementing "pos" by one. |
| // Note: Might return pos == str.length() |
| static inline bool skipCharacter(const String& value, unsigned& pos, WTF::Function<bool(const UChar)>&& predicate) |
| { |
| if (pos < value.length() && predicate(value[pos])) { |
| ++pos; |
| return true; |
| } |
| return false; |
| } |
| |
| // True if the "expected" character is at the given position, incrementing "pos" by one. |
| // Note: Might return pos == str.length() |
| static inline bool skipCharacter(const String& value, unsigned& pos, const UChar expected) |
| { |
| return skipCharacter(value, pos, [expected](const UChar c) { |
| return c == expected; |
| }); |
| } |
| |
| // True if a quoted pair is present, incrementing "pos" to the position after the quoted pair. |
| // Note: Might return pos == str.length() |
| // See RFC 7230, Section 3.2.6. |
| static constexpr auto QuotedPairStartCharacter = '\\'; |
| static bool skipQuotedPair(const String& value, unsigned& pos) |
| { |
| // quoted-pair = "\" ( HTAB / SP / VCHAR / obs-text ) |
| return skipCharacter(value, pos, QuotedPairStartCharacter) |
| && skipCharacter(value, pos, RFC7230::isQuotedPairSecondOctet); |
| } |
| |
| // True if a comment is present, incrementing "pos" to the position after the comment. |
| // Note: Might return pos == str.length() |
| // See RFC 7230, Section 3.2.6. |
| static constexpr auto CommentStartCharacter = '('; |
| static constexpr auto CommentEndCharacter = ')'; |
| static bool skipComment(const String& value, unsigned& pos) |
| { |
| // comment = "(" *( ctext / quoted-pair / comment ) ")" |
| // ctext = HTAB / SP / %x21-27 / %x2A-5B / %x5D-7E / obs-text |
| if (!skipCharacter(value, pos, CommentStartCharacter)) |
| return false; |
| |
| const unsigned end = value.length(); |
| while (pos < end && value[pos] != CommentEndCharacter) { |
| switch (value[pos]) { |
| case CommentStartCharacter: |
| if (!skipComment(value, pos)) |
| return false; |
| break; |
| case QuotedPairStartCharacter: |
| if (!skipQuotedPair(value, pos)) |
| return false; |
| break; |
| default: |
| if (!skipWhile(value, pos, RFC7230::isCommentText)) |
| return false; |
| } |
| } |
| return skipCharacter(value, pos, CommentEndCharacter); |
| } |
| |
| // True if an HTTP header token is present, incrementing "pos" to the position after it. |
| // Note: Might return pos == str.length() |
| // See RFC 7230, Section 3.2.6. |
| static bool skipHTTPToken(const String& value, unsigned& pos) |
| { |
| return skipWhile(value, pos, RFC7230::isTokenCharacter); |
| } |
| |
| // True if a product specifier (as in an User-Agent header) is present, incrementing "pos" to the position after it. |
| // Note: Might return pos == str.length() |
| // See RFC 7231, Section 5.5.3. |
| static bool skipUserAgentProduct(const String& value, unsigned& pos) |
| { |
| // product = token ["/" product-version] |
| // product-version = token |
| if (!skipHTTPToken(value, pos)) |
| return false; |
| if (skipCharacter(value, pos, '/')) |
| return skipHTTPToken(value, pos); |
| return true; |
| } |
| |
| // See RFC 7231, Section 5.5.3 |
| bool isValidUserAgentHeaderValue(const String& value) |
| { |
| // User-Agent = product *( RWS ( product / comment ) ) |
| unsigned pos = 0; |
| if (!skipUserAgentProduct(value, pos)) |
| return false; |
| |
| while (pos < value.length()) { |
| if (!skipWhiteSpace(value, pos)) |
| return false; |
| if (value[pos] == CommentStartCharacter) { |
| if (!skipComment(value, pos)) |
| return false; |
| } else { |
| if (!skipUserAgentProduct(value, pos)) |
| return false; |
| } |
| } |
| |
| return pos == value.length(); |
| } |
| |
| static const size_t maxInputSampleSize = 128; |
| static String trimInputSample(const char* p, size_t length) |
| { |
| String s = String(p, std::min<size_t>(length, maxInputSampleSize)); |
| if (length > maxInputSampleSize) |
| s.append(horizontalEllipsis); |
| return s; |
| } |
| |
| Optional<WallTime> parseHTTPDate(const String& value) |
| { |
| double dateInMillisecondsSinceEpoch = parseDateFromNullTerminatedCharacters(value.utf8().data()); |
| if (!std::isfinite(dateInMillisecondsSinceEpoch)) |
| return WTF::nullopt; |
| // This assumes system_clock epoch equals Unix epoch which is true for all implementations but unspecified. |
| // FIXME: The parsing function should be switched to WallTime too. |
| return WallTime::fromRawSeconds(dateInMillisecondsSinceEpoch / 1000.0); |
| } |
| |
| // FIXME: This function doesn't comply with RFC 6266. |
| // For example, this function doesn't handle the interaction between " and ; |
| // that arises from quoted-string, nor does this function properly unquote |
| // attribute values. Further this function appears to process parameter names |
| // in a case-sensitive manner. (There are likely other bugs as well.) |
| String filenameFromHTTPContentDisposition(const String& value) |
| { |
| for (auto& keyValuePair : value.split(';')) { |
| size_t valueStartPos = keyValuePair.find('='); |
| if (valueStartPos == notFound) |
| continue; |
| |
| String key = keyValuePair.left(valueStartPos).stripWhiteSpace(); |
| |
| if (key.isEmpty() || key != "filename") |
| continue; |
| |
| String value = keyValuePair.substring(valueStartPos + 1).stripWhiteSpace(); |
| |
| // Remove quotes if there are any |
| if (value[0] == '\"') |
| value = value.substring(1, value.length() - 2); |
| |
| return value; |
| } |
| |
| return String(); |
| } |
| |
| String extractMIMETypeFromMediaType(const String& mediaType) |
| { |
| unsigned position = 0; |
| unsigned length = mediaType.length(); |
| |
| for (; position < length; ++position) { |
| UChar c = mediaType[position]; |
| if (c != '\t' && c != ' ') |
| break; |
| } |
| |
| if (position == length) |
| return mediaType; |
| |
| unsigned typeStart = position; |
| |
| unsigned typeEnd = position; |
| for (; position < length; ++position) { |
| UChar c = mediaType[position]; |
| |
| // While RFC 2616 does not allow it, other browsers allow multiple values in the HTTP media |
| // type header field, Content-Type. In such cases, the media type string passed here may contain |
| // the multiple values separated by commas. For now, this code ignores text after the first comma, |
| // which prevents it from simply failing to parse such types altogether. Later for better |
| // compatibility we could consider using the first or last valid MIME type instead. |
| // See https://bugs.webkit.org/show_bug.cgi?id=25352 for more discussion. |
| if (c == ',') |
| break; |
| |
| if (c == '\t' || c == ' ' || c == ';') |
| break; |
| |
| typeEnd = position + 1; |
| } |
| |
| return mediaType.substring(typeStart, typeEnd - typeStart); |
| } |
| |
| String extractCharsetFromMediaType(const String& mediaType) |
| { |
| unsigned int pos, len; |
| findCharsetInMediaType(mediaType, pos, len); |
| return mediaType.substring(pos, len); |
| } |
| |
| void findCharsetInMediaType(const String& mediaType, unsigned int& charsetPos, unsigned int& charsetLen, unsigned int start) |
| { |
| charsetPos = start; |
| charsetLen = 0; |
| |
| size_t pos = start; |
| unsigned length = mediaType.length(); |
| |
| while (pos < length) { |
| pos = mediaType.findIgnoringASCIICase("charset", pos); |
| if (pos == notFound || pos == 0) { |
| charsetLen = 0; |
| return; |
| } |
| |
| // is what we found a beginning of a word? |
| if (mediaType[pos-1] > ' ' && mediaType[pos-1] != ';') { |
| pos += 7; |
| continue; |
| } |
| |
| pos += 7; |
| |
| // skip whitespace |
| while (pos != length && mediaType[pos] <= ' ') |
| ++pos; |
| |
| if (mediaType[pos++] != '=') // this "charset" substring wasn't a parameter name, but there may be others |
| continue; |
| |
| while (pos != length && (mediaType[pos] <= ' ' || mediaType[pos] == '"' || mediaType[pos] == '\'')) |
| ++pos; |
| |
| // we don't handle spaces within quoted parameter values, because charset names cannot have any |
| unsigned endpos = pos; |
| while (pos != length && mediaType[endpos] > ' ' && mediaType[endpos] != '"' && mediaType[endpos] != '\'' && mediaType[endpos] != ';') |
| ++endpos; |
| |
| charsetPos = pos; |
| charsetLen = endpos - pos; |
| return; |
| } |
| } |
| |
| XSSProtectionDisposition parseXSSProtectionHeader(const String& header, String& failureReason, unsigned& failurePosition, String& reportURL) |
| { |
| static NeverDestroyed<String> failureReasonInvalidToggle(MAKE_STATIC_STRING_IMPL("expected 0 or 1")); |
| static NeverDestroyed<String> failureReasonInvalidSeparator(MAKE_STATIC_STRING_IMPL("expected semicolon")); |
| static NeverDestroyed<String> failureReasonInvalidEquals(MAKE_STATIC_STRING_IMPL("expected equals sign")); |
| static NeverDestroyed<String> failureReasonInvalidMode(MAKE_STATIC_STRING_IMPL("invalid mode directive")); |
| static NeverDestroyed<String> failureReasonInvalidReport(MAKE_STATIC_STRING_IMPL("invalid report directive")); |
| static NeverDestroyed<String> failureReasonDuplicateMode(MAKE_STATIC_STRING_IMPL("duplicate mode directive")); |
| static NeverDestroyed<String> failureReasonDuplicateReport(MAKE_STATIC_STRING_IMPL("duplicate report directive")); |
| static NeverDestroyed<String> failureReasonInvalidDirective(MAKE_STATIC_STRING_IMPL("unrecognized directive")); |
| |
| unsigned pos = 0; |
| |
| if (!skipWhiteSpace(header, pos)) |
| return XSSProtectionDisposition::Enabled; |
| |
| if (header[pos] == '0') |
| return XSSProtectionDisposition::Disabled; |
| |
| if (header[pos++] != '1') { |
| failureReason = failureReasonInvalidToggle; |
| return XSSProtectionDisposition::Invalid; |
| } |
| |
| XSSProtectionDisposition result = XSSProtectionDisposition::Enabled; |
| bool modeDirectiveSeen = false; |
| bool reportDirectiveSeen = false; |
| |
| while (1) { |
| // At end of previous directive: consume whitespace, semicolon, and whitespace. |
| if (!skipWhiteSpace(header, pos)) |
| return result; |
| |
| if (header[pos++] != ';') { |
| failureReason = failureReasonInvalidSeparator; |
| failurePosition = pos; |
| return XSSProtectionDisposition::Invalid; |
| } |
| |
| if (!skipWhiteSpace(header, pos)) |
| return result; |
| |
| // At start of next directive. |
| if (skipToken(header, pos, "mode")) { |
| if (modeDirectiveSeen) { |
| failureReason = failureReasonDuplicateMode; |
| failurePosition = pos; |
| return XSSProtectionDisposition::Invalid; |
| } |
| modeDirectiveSeen = true; |
| if (!skipEquals(header, pos)) { |
| failureReason = failureReasonInvalidEquals; |
| failurePosition = pos; |
| return XSSProtectionDisposition::Invalid; |
| } |
| if (!skipToken(header, pos, "block")) { |
| failureReason = failureReasonInvalidMode; |
| failurePosition = pos; |
| return XSSProtectionDisposition::Invalid; |
| } |
| result = XSSProtectionDisposition::BlockEnabled; |
| } else if (skipToken(header, pos, "report")) { |
| if (reportDirectiveSeen) { |
| failureReason = failureReasonDuplicateReport; |
| failurePosition = pos; |
| return XSSProtectionDisposition::Invalid; |
| } |
| reportDirectiveSeen = true; |
| if (!skipEquals(header, pos)) { |
| failureReason = failureReasonInvalidEquals; |
| failurePosition = pos; |
| return XSSProtectionDisposition::Invalid; |
| } |
| size_t startPos = pos; |
| if (!skipValue(header, pos)) { |
| failureReason = failureReasonInvalidReport; |
| failurePosition = pos; |
| return XSSProtectionDisposition::Invalid; |
| } |
| reportURL = header.substring(startPos, pos - startPos); |
| failurePosition = startPos; // If later semantic check deems unacceptable. |
| } else { |
| failureReason = failureReasonInvalidDirective; |
| failurePosition = pos; |
| return XSSProtectionDisposition::Invalid; |
| } |
| } |
| } |
| |
| ContentTypeOptionsDisposition parseContentTypeOptionsHeader(StringView header) |
| { |
| StringView leftToken = header.left(header.find(',')); |
| if (equalLettersIgnoringASCIICase(stripLeadingAndTrailingHTTPSpaces(leftToken), "nosniff")) |
| return ContentTypeOptionsNosniff; |
| return ContentTypeOptionsNone; |
| } |
| |
| // For example: "HTTP/1.1 200 OK" => "OK". |
| // Note that HTTP/2 does not include a reason phrase, so we return the empty atom. |
| AtomString extractReasonPhraseFromHTTPStatusLine(const String& statusLine) |
| { |
| StringView view = statusLine; |
| size_t spacePos = view.find(' '); |
| |
| // Remove status code from the status line. |
| spacePos = view.find(' ', spacePos + 1); |
| if (spacePos == notFound) |
| return emptyAtom(); |
| |
| return view.substring(spacePos + 1).toAtomString(); |
| } |
| |
| XFrameOptionsDisposition parseXFrameOptionsHeader(const String& header) |
| { |
| XFrameOptionsDisposition result = XFrameOptionsNone; |
| |
| if (header.isEmpty()) |
| return result; |
| |
| for (auto& currentHeader : header.split(',')) { |
| currentHeader = currentHeader.stripWhiteSpace(); |
| XFrameOptionsDisposition currentValue = XFrameOptionsNone; |
| if (equalLettersIgnoringASCIICase(currentHeader, "deny")) |
| currentValue = XFrameOptionsDeny; |
| else if (equalLettersIgnoringASCIICase(currentHeader, "sameorigin")) |
| currentValue = XFrameOptionsSameOrigin; |
| else if (equalLettersIgnoringASCIICase(currentHeader, "allowall")) |
| currentValue = XFrameOptionsAllowAll; |
| else |
| currentValue = XFrameOptionsInvalid; |
| |
| if (result == XFrameOptionsNone) |
| result = currentValue; |
| else if (result != currentValue) |
| return XFrameOptionsConflict; |
| } |
| return result; |
| } |
| |
| bool parseRange(const String& range, long long& rangeOffset, long long& rangeEnd, long long& rangeSuffixLength) |
| { |
| // The format of "Range" header is defined in RFC 2616 Section 14.35.1. |
| // http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35.1 |
| // We don't support multiple range requests. |
| |
| rangeOffset = rangeEnd = rangeSuffixLength = -1; |
| |
| // The "bytes" unit identifier should be present. |
| static const unsigned bytesLength = 6; |
| if (!startsWithLettersIgnoringASCIICase(range, "bytes=")) |
| return false; |
| // FIXME: The rest of this should use StringView. |
| String byteRange = range.substring(bytesLength); |
| |
| // The '-' character needs to be present. |
| int index = byteRange.find('-'); |
| if (index == -1) |
| return false; |
| |
| // If the '-' character is at the beginning, the suffix length, which specifies the last N bytes, is provided. |
| // Example: |
| // -500 |
| if (!index) { |
| String suffixLengthString = byteRange.substring(index + 1).stripWhiteSpace(); |
| bool ok; |
| long long value = suffixLengthString.toInt64Strict(&ok); |
| if (ok) |
| rangeSuffixLength = value; |
| return true; |
| } |
| |
| // Otherwise, the first-byte-position and the last-byte-position are provied. |
| // Examples: |
| // 0-499 |
| // 500- |
| String firstBytePosStr = byteRange.left(index).stripWhiteSpace(); |
| bool ok; |
| long long firstBytePos = firstBytePosStr.toInt64Strict(&ok); |
| if (!ok) |
| return false; |
| |
| String lastBytePosStr = byteRange.substring(index + 1).stripWhiteSpace(); |
| long long lastBytePos = -1; |
| if (!lastBytePosStr.isEmpty()) { |
| lastBytePos = lastBytePosStr.toInt64Strict(&ok); |
| if (!ok) |
| return false; |
| } |
| |
| if (firstBytePos < 0 || !(lastBytePos == -1 || lastBytePos >= firstBytePos)) |
| return false; |
| |
| rangeOffset = firstBytePos; |
| rangeEnd = lastBytePos; |
| return true; |
| } |
| |
| // HTTP/1.1 - RFC 2616 |
| // http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1 |
| // Request-Line = Method SP Request-URI SP HTTP-Version CRLF |
| size_t parseHTTPRequestLine(const char* data, size_t length, String& failureReason, String& method, String& url, HTTPVersion& httpVersion) |
| { |
| method = String(); |
| url = String(); |
| httpVersion = Unknown; |
| |
| const char* space1 = 0; |
| const char* space2 = 0; |
| const char* p; |
| size_t consumedLength; |
| |
| for (p = data, consumedLength = 0; consumedLength < length; p++, consumedLength++) { |
| if (*p == ' ') { |
| if (!space1) |
| space1 = p; |
| else if (!space2) |
| space2 = p; |
| } else if (*p == '\n') |
| break; |
| } |
| |
| // Haven't finished header line. |
| if (consumedLength == length) { |
| failureReason = "Incomplete Request Line"_s; |
| return 0; |
| } |
| |
| // RequestLine does not contain 3 parts. |
| if (!space1 || !space2) { |
| failureReason = "Request Line does not appear to contain: <Method> <Url> <HTTPVersion>."_s; |
| return 0; |
| } |
| |
| // The line must end with "\r\n". |
| const char* end = p + 1; |
| if (*(end - 2) != '\r') { |
| failureReason = "Request line does not end with CRLF"_s; |
| return 0; |
| } |
| |
| // Request Method. |
| method = String(data, space1 - data); // For length subtract 1 for space, but add 1 for data being the first character. |
| |
| // Request URI. |
| url = String(space1 + 1, space2 - space1 - 1); // For length subtract 1 for space. |
| |
| // HTTP Version. |
| String httpVersionString(space2 + 1, end - space2 - 3); // For length subtract 1 for space, and 2 for "\r\n". |
| if (httpVersionString.length() != 8 || !httpVersionString.startsWith("HTTP/1.")) |
| httpVersion = Unknown; |
| else if (httpVersionString[7] == '0') |
| httpVersion = HTTP_1_0; |
| else if (httpVersionString[7] == '1') |
| httpVersion = HTTP_1_1; |
| else |
| httpVersion = Unknown; |
| |
| return end - data; |
| } |
| |
| static inline bool isValidHeaderNameCharacter(const char* character) |
| { |
| // https://tools.ietf.org/html/rfc7230#section-3.2 |
| // A header name should only contain one or more of |
| // alphanumeric or ! # $ % & ' * + - . ^ _ ` | ~ |
| if (isASCIIAlphanumeric(*character)) |
| return true; |
| switch (*character) { |
| case '!': |
| case '#': |
| case '$': |
| case '%': |
| case '&': |
| case '\'': |
| case '*': |
| case '+': |
| case '-': |
| case '.': |
| case '^': |
| case '_': |
| case '`': |
| case '|': |
| case '~': |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| size_t parseHTTPHeader(const char* start, size_t length, String& failureReason, StringView& nameStr, String& valueStr, bool strict) |
| { |
| const char* p = start; |
| const char* end = start + length; |
| |
| Vector<char> name; |
| Vector<char> value; |
| |
| bool foundFirstNameChar = false; |
| const char* namePtr = nullptr; |
| size_t nameSize = 0; |
| |
| nameStr = StringView(); |
| valueStr = String(); |
| |
| for (; p < end; p++) { |
| switch (*p) { |
| case '\r': |
| if (name.isEmpty()) { |
| if (p + 1 < end && *(p + 1) == '\n') |
| return (p + 2) - start; |
| failureReason = makeString("CR doesn't follow LF in header name at ", trimInputSample(p, end - p)); |
| return 0; |
| } |
| failureReason = makeString("Unexpected CR in header name at ", trimInputSample(name.data(), name.size())); |
| return 0; |
| case '\n': |
| failureReason = makeString("Unexpected LF in header name at ", trimInputSample(name.data(), name.size())); |
| return 0; |
| case ':': |
| break; |
| default: |
| if (!isValidHeaderNameCharacter(p)) { |
| if (name.size() < 1) |
| failureReason = "Unexpected start character in header name"; |
| else |
| failureReason = makeString("Unexpected character in header name at ", trimInputSample(name.data(), name.size())); |
| return 0; |
| } |
| name.append(*p); |
| if (!foundFirstNameChar) { |
| namePtr = p; |
| foundFirstNameChar = true; |
| } |
| continue; |
| } |
| if (*p == ':') { |
| ++p; |
| break; |
| } |
| } |
| |
| nameSize = name.size(); |
| nameStr = StringView(namePtr, nameSize); |
| |
| for (; p < end && *p == 0x20; p++) { } |
| |
| for (; p < end; p++) { |
| switch (*p) { |
| case '\r': |
| break; |
| case '\n': |
| if (strict) { |
| failureReason = makeString("Unexpected LF in header value at ", trimInputSample(value.data(), value.size())); |
| return 0; |
| } |
| break; |
| default: |
| value.append(*p); |
| } |
| if (*p == '\r' || (!strict && *p == '\n')) { |
| ++p; |
| break; |
| } |
| } |
| if (p >= end || (strict && *p != '\n')) { |
| failureReason = makeString("CR doesn't follow LF after header value at ", trimInputSample(p, end - p)); |
| return 0; |
| } |
| valueStr = String::fromUTF8(value.data(), value.size()); |
| if (valueStr.isNull()) { |
| failureReason = "Invalid UTF-8 sequence in header value"_s; |
| return 0; |
| } |
| return p - start; |
| } |
| |
| size_t parseHTTPRequestBody(const char* data, size_t length, Vector<unsigned char>& body) |
| { |
| body.clear(); |
| body.append(data, length); |
| |
| return length; |
| } |
| |
| // Implements <https://fetch.spec.whatwg.org/#forbidden-header-name>. |
| bool isForbiddenHeaderName(const String& name) |
| { |
| HTTPHeaderName headerName; |
| if (findHTTPHeaderName(name, headerName)) { |
| switch (headerName) { |
| case HTTPHeaderName::AcceptCharset: |
| case HTTPHeaderName::AcceptEncoding: |
| case HTTPHeaderName::AccessControlRequestHeaders: |
| case HTTPHeaderName::AccessControlRequestMethod: |
| case HTTPHeaderName::Connection: |
| case HTTPHeaderName::ContentLength: |
| case HTTPHeaderName::Cookie: |
| case HTTPHeaderName::Cookie2: |
| case HTTPHeaderName::Date: |
| case HTTPHeaderName::DNT: |
| case HTTPHeaderName::Expect: |
| case HTTPHeaderName::Host: |
| case HTTPHeaderName::KeepAlive: |
| case HTTPHeaderName::Origin: |
| case HTTPHeaderName::Referer: |
| case HTTPHeaderName::TE: |
| case HTTPHeaderName::Trailer: |
| case HTTPHeaderName::TransferEncoding: |
| case HTTPHeaderName::Upgrade: |
| case HTTPHeaderName::Via: |
| return true; |
| default: |
| break; |
| } |
| } |
| return startsWithLettersIgnoringASCIICase(name, "sec-") || startsWithLettersIgnoringASCIICase(name, "proxy-"); |
| } |
| |
| // Implements <https://fetch.spec.whatwg.org/#no-cors-safelisted-request-header-name>. |
| bool isNoCORSSafelistedRequestHeaderName(const String& name) |
| { |
| HTTPHeaderName headerName; |
| if (findHTTPHeaderName(name, headerName)) { |
| switch (headerName) { |
| case HTTPHeaderName::Accept: |
| case HTTPHeaderName::AcceptLanguage: |
| case HTTPHeaderName::ContentLanguage: |
| case HTTPHeaderName::ContentType: |
| return true; |
| default: |
| break; |
| } |
| } |
| return false; |
| } |
| |
| // Implements <https://fetch.spec.whatwg.org/#privileged-no-cors-request-header-name>. |
| bool isPriviledgedNoCORSRequestHeaderName(const String& name) |
| { |
| return equalLettersIgnoringASCIICase(name, "range"); |
| } |
| |
| // Implements <https://fetch.spec.whatwg.org/#forbidden-response-header-name>. |
| bool isForbiddenResponseHeaderName(const String& name) |
| { |
| return equalLettersIgnoringASCIICase(name, "set-cookie") || equalLettersIgnoringASCIICase(name, "set-cookie2"); |
| } |
| |
| // Implements <https://fetch.spec.whatwg.org/#forbidden-method>. |
| bool isForbiddenMethod(const String& name) |
| { |
| return equalLettersIgnoringASCIICase(name, "connect") || equalLettersIgnoringASCIICase(name, "trace") || equalLettersIgnoringASCIICase(name, "track"); |
| } |
| |
| bool isSimpleHeader(const String& name, const String& value) |
| { |
| HTTPHeaderName headerName; |
| if (!findHTTPHeaderName(name, headerName)) |
| return false; |
| return isCrossOriginSafeRequestHeader(headerName, value); |
| } |
| |
| bool isCrossOriginSafeHeader(HTTPHeaderName name, const HTTPHeaderSet& accessControlExposeHeaderSet) |
| { |
| switch (name) { |
| case HTTPHeaderName::CacheControl: |
| case HTTPHeaderName::ContentLanguage: |
| case HTTPHeaderName::ContentLength: |
| case HTTPHeaderName::ContentType: |
| case HTTPHeaderName::Expires: |
| case HTTPHeaderName::LastModified: |
| case HTTPHeaderName::Pragma: |
| case HTTPHeaderName::Accept: |
| return true; |
| case HTTPHeaderName::SetCookie: |
| case HTTPHeaderName::SetCookie2: |
| return false; |
| default: |
| break; |
| } |
| return accessControlExposeHeaderSet.contains(httpHeaderNameString(name).toStringWithoutCopying()); |
| } |
| |
| bool isCrossOriginSafeHeader(const String& name, const HTTPHeaderSet& accessControlExposeHeaderSet) |
| { |
| #ifndef ASSERT_DISABLED |
| HTTPHeaderName headerName; |
| ASSERT(!findHTTPHeaderName(name, headerName)); |
| #endif |
| return accessControlExposeHeaderSet.contains(name); |
| } |
| |
| // Implements https://fetch.spec.whatwg.org/#cors-safelisted-request-header |
| bool isCrossOriginSafeRequestHeader(HTTPHeaderName name, const String& value) |
| { |
| switch (name) { |
| case HTTPHeaderName::Accept: |
| if (!isValidAcceptHeaderValue(value)) |
| return false; |
| break; |
| case HTTPHeaderName::AcceptLanguage: |
| case HTTPHeaderName::ContentLanguage: |
| if (!isValidLanguageHeaderValue(value)) |
| return false; |
| break; |
| case HTTPHeaderName::ContentType: { |
| // Preflight is required for MIME types that can not be sent via form submission. |
| if (containsCORSUnsafeRequestHeaderBytes(value)) |
| return false; |
| auto parsedContentType = ParsedContentType::create(value); |
| if (!parsedContentType) |
| return false; |
| String mimeType = parsedContentType->mimeType(); |
| if (!(equalLettersIgnoringASCIICase(mimeType, "application/x-www-form-urlencoded") || equalLettersIgnoringASCIICase(mimeType, "multipart/form-data") || equalLettersIgnoringASCIICase(mimeType, "text/plain"))) |
| return false; |
| break; |
| } |
| default: |
| // FIXME: Should we also make safe other headers (DPR, Downlink, Save-Data...)? That would require validating their values. |
| return false; |
| } |
| return value.length() <= 128; |
| } |
| |
| // Implements <https://fetch.spec.whatwg.org/#concept-method-normalize>. |
| String normalizeHTTPMethod(const String& method) |
| { |
| const ASCIILiteral methods[] = { "DELETE"_s, "GET"_s, "HEAD"_s, "OPTIONS"_s, "POST"_s, "PUT"_s }; |
| for (auto value : methods) { |
| if (equalIgnoringASCIICase(method, value.characters())) { |
| // Don't bother allocating a new string if it's already all uppercase. |
| if (method == value) |
| break; |
| return value; |
| } |
| } |
| return method; |
| } |
| |
| CrossOriginResourcePolicy parseCrossOriginResourcePolicyHeader(StringView header) |
| { |
| auto strippedHeader = stripLeadingAndTrailingHTTPSpaces(header); |
| |
| if (strippedHeader.isEmpty()) |
| return CrossOriginResourcePolicy::None; |
| |
| if (strippedHeader == "same-origin") |
| return CrossOriginResourcePolicy::SameOrigin; |
| |
| if (strippedHeader == "same-site") |
| return CrossOriginResourcePolicy::SameSite; |
| |
| return CrossOriginResourcePolicy::Invalid; |
| } |
| |
| } |
