Nitish Tiwari
6 years ago
committed by
kannappanr
parent
28d526bc68
commit
36c39d04da
File diff suppressed because it is too large
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@ -0,0 +1,65 @@ |
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package httpguts provides functions implementing various details
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// of the HTTP specification.
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//
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// This package is shared by the standard library (which vendors it)
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// and x/net/http2. It comes with no API stability promise.
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package httpguts |
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import ( |
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"net/textproto" |
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"strings" |
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) |
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// SniffedContentType reports whether ct is a Content-Type that is known
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// to cause client-side content sniffing.
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//
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// This provides just a partial implementation of mime.ParseMediaType
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// with the assumption that the Content-Type is not attacker controlled.
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func SniffedContentType(ct string) bool { |
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if i := strings.Index(ct, ";"); i != -1 { |
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ct = ct[:i] |
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} |
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ct = strings.ToLower(strings.TrimSpace(ct)) |
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return ct == "text/plain" || ct == "application/octet-stream" || |
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ct == "application/unknown" || ct == "unknown/unknown" || ct == "*/*" || |
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!strings.Contains(ct, "/") |
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} |
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// ValidTrailerHeader reports whether name is a valid header field name to appear
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// in trailers.
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// See RFC 7230, Section 4.1.2
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func ValidTrailerHeader(name string) bool { |
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name = textproto.CanonicalMIMEHeaderKey(name) |
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if strings.HasPrefix(name, "If-") || badTrailer[name] { |
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return false |
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} |
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return true |
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} |
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var badTrailer = map[string]bool{ |
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"Authorization": true, |
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"Cache-Control": true, |
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"Connection": true, |
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"Content-Encoding": true, |
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"Content-Length": true, |
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"Content-Range": true, |
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"Content-Type": true, |
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"Expect": true, |
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"Host": true, |
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"Keep-Alive": true, |
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"Max-Forwards": true, |
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"Pragma": true, |
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"Proxy-Authenticate": true, |
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"Proxy-Authorization": true, |
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"Proxy-Connection": true, |
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"Range": true, |
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"Realm": true, |
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"Te": true, |
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"Trailer": true, |
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"Transfer-Encoding": true, |
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"Www-Authenticate": true, |
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} |
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@ -0,0 +1,346 @@ |
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package httpguts |
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import ( |
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"net" |
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"strings" |
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"unicode/utf8" |
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"golang.org/x/net/idna" |
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) |
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var isTokenTable = [127]bool{ |
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'!': true, |
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'#': true, |
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'$': true, |
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'%': true, |
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'&': true, |
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'\'': true, |
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'*': true, |
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'+': true, |
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'-': true, |
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'.': true, |
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'0': true, |
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'1': true, |
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'2': true, |
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'3': true, |
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'4': true, |
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'5': true, |
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'6': true, |
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'7': true, |
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'8': true, |
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'9': true, |
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'A': true, |
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'B': true, |
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'C': true, |
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'D': true, |
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'E': true, |
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'F': true, |
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'G': true, |
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'H': true, |
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'I': true, |
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'J': true, |
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'K': true, |
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'L': true, |
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'M': true, |
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'N': true, |
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'O': true, |
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'P': true, |
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'Q': true, |
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'R': true, |
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'S': true, |
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'T': true, |
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'U': true, |
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'W': true, |
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'V': true, |
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'X': true, |
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'Y': true, |
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'Z': true, |
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'^': true, |
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'_': true, |
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'`': true, |
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'a': true, |
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'b': true, |
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'c': true, |
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'd': true, |
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'e': true, |
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'f': true, |
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'g': true, |
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'h': true, |
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'i': true, |
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'j': true, |
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'k': true, |
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'l': true, |
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'm': true, |
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'n': true, |
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'o': true, |
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'p': true, |
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'q': true, |
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'r': true, |
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's': true, |
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't': true, |
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'u': true, |
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'v': true, |
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'w': true, |
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'x': true, |
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'y': true, |
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'z': true, |
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'|': true, |
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'~': true, |
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} |
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func IsTokenRune(r rune) bool { |
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i := int(r) |
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return i < len(isTokenTable) && isTokenTable[i] |
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} |
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func isNotToken(r rune) bool { |
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return !IsTokenRune(r) |
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} |
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// HeaderValuesContainsToken reports whether any string in values
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// contains the provided token, ASCII case-insensitively.
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func HeaderValuesContainsToken(values []string, token string) bool { |
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for _, v := range values { |
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if headerValueContainsToken(v, token) { |
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return true |
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} |
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} |
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return false |
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} |
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// isOWS reports whether b is an optional whitespace byte, as defined
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// by RFC 7230 section 3.2.3.
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func isOWS(b byte) bool { return b == ' ' || b == '\t' } |
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// trimOWS returns x with all optional whitespace removes from the
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// beginning and end.
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func trimOWS(x string) string { |
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// TODO: consider using strings.Trim(x, " \t") instead,
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// if and when it's fast enough. See issue 10292.
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// But this ASCII-only code will probably always beat UTF-8
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// aware code.
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for len(x) > 0 && isOWS(x[0]) { |
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x = x[1:] |
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} |
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for len(x) > 0 && isOWS(x[len(x)-1]) { |
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x = x[:len(x)-1] |
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} |
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return x |
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} |
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// headerValueContainsToken reports whether v (assumed to be a
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// 0#element, in the ABNF extension described in RFC 7230 section 7)
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// contains token amongst its comma-separated tokens, ASCII
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// case-insensitively.
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func headerValueContainsToken(v string, token string) bool { |
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v = trimOWS(v) |
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if comma := strings.IndexByte(v, ','); comma != -1 { |
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return tokenEqual(trimOWS(v[:comma]), token) || headerValueContainsToken(v[comma+1:], token) |
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} |
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return tokenEqual(v, token) |
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} |
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// lowerASCII returns the ASCII lowercase version of b.
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func lowerASCII(b byte) byte { |
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if 'A' <= b && b <= 'Z' { |
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return b + ('a' - 'A') |
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} |
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return b |
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} |
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// tokenEqual reports whether t1 and t2 are equal, ASCII case-insensitively.
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func tokenEqual(t1, t2 string) bool { |
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if len(t1) != len(t2) { |
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return false |
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} |
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for i, b := range t1 { |
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if b >= utf8.RuneSelf { |
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// No UTF-8 or non-ASCII allowed in tokens.
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return false |
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} |
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if lowerASCII(byte(b)) != lowerASCII(t2[i]) { |
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return false |
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} |
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} |
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return true |
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} |
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// isLWS reports whether b is linear white space, according
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// to http://www.w3.org/Protocols/rfc2616/rfc2616-sec2.html#sec2.2
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// LWS = [CRLF] 1*( SP | HT )
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func isLWS(b byte) bool { return b == ' ' || b == '\t' } |
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// isCTL reports whether b is a control byte, according
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// to http://www.w3.org/Protocols/rfc2616/rfc2616-sec2.html#sec2.2
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// CTL = <any US-ASCII control character
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// (octets 0 - 31) and DEL (127)>
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func isCTL(b byte) bool { |
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const del = 0x7f // a CTL
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return b < ' ' || b == del |
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} |
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// ValidHeaderFieldName reports whether v is a valid HTTP/1.x header name.
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// HTTP/2 imposes the additional restriction that uppercase ASCII
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// letters are not allowed.
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//
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// RFC 7230 says:
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// header-field = field-name ":" OWS field-value OWS
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// field-name = token
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// token = 1*tchar
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// tchar = "!" / "#" / "$" / "%" / "&" / "'" / "*" / "+" / "-" / "." /
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// "^" / "_" / "`" / "|" / "~" / DIGIT / ALPHA
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func ValidHeaderFieldName(v string) bool { |
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if len(v) == 0 { |
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return false |
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} |
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for _, r := range v { |
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if !IsTokenRune(r) { |
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return false |
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} |
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} |
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return true |
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} |
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// ValidHostHeader reports whether h is a valid host header.
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func ValidHostHeader(h string) bool { |
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// The latest spec is actually this:
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//
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// http://tools.ietf.org/html/rfc7230#section-5.4
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// Host = uri-host [ ":" port ]
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//
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// Where uri-host is:
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// http://tools.ietf.org/html/rfc3986#section-3.2.2
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//
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// But we're going to be much more lenient for now and just
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// search for any byte that's not a valid byte in any of those
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// expressions.
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for i := 0; i < len(h); i++ { |
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if !validHostByte[h[i]] { |
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return false |
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} |
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} |
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return true |
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} |
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// See the validHostHeader comment.
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var validHostByte = [256]bool{ |
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'0': true, '1': true, '2': true, '3': true, '4': true, '5': true, '6': true, '7': true, |
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'8': true, '9': true, |
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'a': true, 'b': true, 'c': true, 'd': true, 'e': true, 'f': true, 'g': true, 'h': true, |
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'i': true, 'j': true, 'k': true, 'l': true, 'm': true, 'n': true, 'o': true, 'p': true, |
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'q': true, 'r': true, 's': true, 't': true, 'u': true, 'v': true, 'w': true, 'x': true, |
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'y': true, 'z': true, |
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'A': true, 'B': true, 'C': true, 'D': true, 'E': true, 'F': true, 'G': true, 'H': true, |
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'I': true, 'J': true, 'K': true, 'L': true, 'M': true, 'N': true, 'O': true, 'P': true, |
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'Q': true, 'R': true, 'S': true, 'T': true, 'U': true, 'V': true, 'W': true, 'X': true, |
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'Y': true, 'Z': true, |
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'!': true, // sub-delims
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'$': true, // sub-delims
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'%': true, // pct-encoded (and used in IPv6 zones)
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'&': true, // sub-delims
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'(': true, // sub-delims
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')': true, // sub-delims
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'*': true, // sub-delims
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'+': true, // sub-delims
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',': true, // sub-delims
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'-': true, // unreserved
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'.': true, // unreserved
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':': true, // IPv6address + Host expression's optional port
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';': true, // sub-delims
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'=': true, // sub-delims
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'[': true, |
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'\'': true, // sub-delims
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']': true, |
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'_': true, // unreserved
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'~': true, // unreserved
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} |
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// ValidHeaderFieldValue reports whether v is a valid "field-value" according to
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// http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2 :
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//
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// message-header = field-name ":" [ field-value ]
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// field-value = *( field-content | LWS )
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// field-content = <the OCTETs making up the field-value
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// and consisting of either *TEXT or combinations
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// of token, separators, and quoted-string>
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//
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// http://www.w3.org/Protocols/rfc2616/rfc2616-sec2.html#sec2.2 :
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//
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// TEXT = <any OCTET except CTLs,
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// but including LWS>
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// LWS = [CRLF] 1*( SP | HT )
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// CTL = <any US-ASCII control character
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// (octets 0 - 31) and DEL (127)>
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//
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// RFC 7230 says:
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// field-value = *( field-content / obs-fold )
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// obj-fold = N/A to http2, and deprecated
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// field-content = field-vchar [ 1*( SP / HTAB ) field-vchar ]
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// field-vchar = VCHAR / obs-text
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// obs-text = %x80-FF
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// VCHAR = "any visible [USASCII] character"
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//
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// http2 further says: "Similarly, HTTP/2 allows header field values
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// that are not valid. While most of the values that can be encoded
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// will not alter header field parsing, carriage return (CR, ASCII
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// 0xd), line feed (LF, ASCII 0xa), and the zero character (NUL, ASCII
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// 0x0) might be exploited by an attacker if they are translated
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// verbatim. Any request or response that contains a character not
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// permitted in a header field value MUST be treated as malformed
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// (Section 8.1.2.6). Valid characters are defined by the
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// field-content ABNF rule in Section 3.2 of [RFC7230]."
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//
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// This function does not (yet?) properly handle the rejection of
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// strings that begin or end with SP or HTAB.
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func ValidHeaderFieldValue(v string) bool { |
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for i := 0; i < len(v); i++ { |
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b := v[i] |
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if isCTL(b) && !isLWS(b) { |
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return false |
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} |
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} |
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return true |
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} |
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func isASCII(s string) bool { |
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for i := 0; i < len(s); i++ { |
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if s[i] >= utf8.RuneSelf { |
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return false |
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} |
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} |
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return true |
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} |
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// PunycodeHostPort returns the IDNA Punycode version
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// of the provided "host" or "host:port" string.
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func PunycodeHostPort(v string) (string, error) { |
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if isASCII(v) { |
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return v, nil |
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} |
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host, port, err := net.SplitHostPort(v) |
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if err != nil { |
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// The input 'v' argument was just a "host" argument,
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// without a port. This error should not be returned
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// to the caller.
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host = v |
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port = "" |
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} |
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host, err = idna.ToASCII(host) |
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if err != nil { |
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// Non-UTF-8? Not representable in Punycode, in any
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// case.
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return "", err |
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} |
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if port == "" { |
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return host, nil |
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} |
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return net.JoinHostPort(host, port), nil |
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} |
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