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211 lines
6.8 KiB
211 lines
6.8 KiB
/*
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* Minio Cloud Storage, (C) 2015, 2016, 2017 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"crypto/hmac"
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"encoding/hex"
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"net/http"
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"regexp"
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"strconv"
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"strings"
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"unicode/utf8"
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"github.com/minio/sha256-simd"
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)
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// http Header "x-amz-content-sha256" == "UNSIGNED-PAYLOAD" indicates that the
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// client did not calculate sha256 of the payload.
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const unsignedPayload = "UNSIGNED-PAYLOAD"
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// skipContentSha256Cksum returns true if caller needs to skip
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// payload checksum, false if not.
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func skipContentSha256Cksum(r *http.Request) bool {
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var (
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v []string
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ok bool
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)
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if isRequestPresignedSignatureV4(r) {
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v, ok = r.URL.Query()["X-Amz-Content-Sha256"]
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} else {
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v, ok = r.Header["X-Amz-Content-Sha256"]
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}
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// If x-amz-content-sha256 is set and the value is not
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// 'UNSIGNED-PAYLOAD' we should validate the content sha256.
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return !(ok && v[0] != unsignedPayload)
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}
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// Returns SHA256 for calculating canonical-request.
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func getContentSha256Cksum(r *http.Request) string {
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var (
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defaultSha256Cksum string
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v []string
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ok bool
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)
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// For a presigned request we look at the query param for sha256.
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if isRequestPresignedSignatureV4(r) {
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// X-Amz-Content-Sha256, if not set in presigned requests, checksum
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// will default to 'UNSIGNED-PAYLOAD'.
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defaultSha256Cksum = unsignedPayload
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v, ok = r.URL.Query()["X-Amz-Content-Sha256"]
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} else {
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// X-Amz-Content-Sha256, if not set in signed requests, checksum
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// will default to sha256([]byte("")).
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defaultSha256Cksum = emptySHA256
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v, ok = r.Header["X-Amz-Content-Sha256"]
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}
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// We found 'X-Amz-Content-Sha256' return the captured value.
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if ok {
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return v[0]
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}
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// We couldn't find 'X-Amz-Content-Sha256'.
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return defaultSha256Cksum
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}
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// isValidRegion - verify if incoming region value is valid with configured Region.
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func isValidRegion(reqRegion string, confRegion string) bool {
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if confRegion == "" {
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return true
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}
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if confRegion == "US" {
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confRegion = globalMinioDefaultRegion
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}
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// Some older s3 clients set region as "US" instead of
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// globalMinioDefaultRegion, handle it.
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if reqRegion == "US" {
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reqRegion = globalMinioDefaultRegion
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}
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return reqRegion == confRegion
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}
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// sumHMAC calculate hmac between two input byte array.
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func sumHMAC(key []byte, data []byte) []byte {
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hash := hmac.New(sha256.New, key)
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hash.Write(data)
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return hash.Sum(nil)
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}
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// Reserved string regexp.
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var reservedNames = regexp.MustCompile("^[a-zA-Z0-9-_.~/]+$")
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// getURLEncodedName encode the strings from UTF-8 byte representations to HTML hex escape sequences
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//
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// This is necessary since regular url.Parse() and url.Encode() functions do not support UTF-8
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// non english characters cannot be parsed due to the nature in which url.Encode() is written
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//
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// This function on the other hand is a direct replacement for url.Encode() technique to support
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// pretty much every UTF-8 character.
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func getURLEncodedName(name string) string {
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// if object matches reserved string, no need to encode them
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if reservedNames.MatchString(name) {
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return name
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}
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var encodedName string
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for _, s := range name {
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if 'A' <= s && s <= 'Z' || 'a' <= s && s <= 'z' || '0' <= s && s <= '9' { // §2.3 Unreserved characters (mark)
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encodedName = encodedName + string(s)
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continue
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}
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switch s {
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case '-', '_', '.', '~', '/': // §2.3 Unreserved characters (mark)
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encodedName = encodedName + string(s)
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continue
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default:
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len := utf8.RuneLen(s)
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if len > 0 {
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u := make([]byte, len)
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utf8.EncodeRune(u, s)
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for _, r := range u {
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hex := hex.EncodeToString([]byte{r})
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encodedName = encodedName + "%" + strings.ToUpper(hex)
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}
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}
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}
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}
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return encodedName
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}
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// extractSignedHeaders extract signed headers from Authorization header
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func extractSignedHeaders(signedHeaders []string, r *http.Request) (http.Header, APIErrorCode) {
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reqHeaders := r.Header
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// find whether "host" is part of list of signed headers.
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// if not return ErrUnsignedHeaders. "host" is mandatory.
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if !contains(signedHeaders, "host") {
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return nil, ErrUnsignedHeaders
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}
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extractedSignedHeaders := make(http.Header)
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for _, header := range signedHeaders {
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// `host` will not be found in the headers, can be found in r.Host.
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// but its alway necessary that the list of signed headers containing host in it.
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val, ok := reqHeaders[http.CanonicalHeaderKey(header)]
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if ok {
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for _, enc := range val {
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extractedSignedHeaders.Add(header, enc)
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}
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continue
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}
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switch header {
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case "expect":
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// Golang http server strips off 'Expect' header, if the
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// client sent this as part of signed headers we need to
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// handle otherwise we would see a signature mismatch.
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// `aws-cli` sets this as part of signed headers.
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//
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// According to
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// http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.20
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// Expect header is always of form:
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//
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// Expect = "Expect" ":" 1#expectation
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// expectation = "100-continue" | expectation-extension
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//
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// So it safe to assume that '100-continue' is what would
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// be sent, for the time being keep this work around.
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// Adding a *TODO* to remove this later when Golang server
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// doesn't filter out the 'Expect' header.
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extractedSignedHeaders.Set(header, "100-continue")
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case "host":
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// Go http server removes "host" from Request.Header
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extractedSignedHeaders.Set(header, r.Host)
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case "transfer-encoding":
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// Go http server removes "host" from Request.Header
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for _, enc := range r.TransferEncoding {
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extractedSignedHeaders.Add(header, enc)
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}
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case "content-length":
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// Signature-V4 spec excludes Content-Length from signed headers list for signature calculation.
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// But some clients deviate from this rule. Hence we consider Content-Length for signature
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// calculation to be compatible with such clients.
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extractedSignedHeaders.Set(header, strconv.FormatInt(r.ContentLength, 10))
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default:
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return nil, ErrUnsignedHeaders
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}
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}
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return extractedSignedHeaders, ErrNone
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}
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// Trim leading and trailing spaces and replace sequential spaces with one space, following Trimall()
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// in http://docs.aws.amazon.com/general/latest/gr/sigv4-create-canonical-request.html
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func signV4TrimAll(input string) string {
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// Compress adjacent spaces (a space is determined by
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// unicode.IsSpace() internally here) to one space and return
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return strings.Join(strings.Fields(input), " ")
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}
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