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/*
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* Minio Cloud Storage, (C) 2015 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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"net/http"
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"net/url"
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"strings"
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"time"
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"github.com/minio/minio/pkg/auth"
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)
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// credentialHeader data type represents structured form of Credential
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// string from authorization header.
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type credentialHeader struct {
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accessKey string
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scope struct {
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date time.Time
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region string
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service string
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request string
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}
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}
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// Return scope string.
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func (c credentialHeader) getScope() string {
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return strings.Join([]string{
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c.scope.date.Format(yyyymmdd),
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c.scope.region,
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c.scope.service,
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c.scope.request,
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}, "/")
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}
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func getReqAccessKeyV4(r *http.Request, region string, stype serviceType) (auth.Credentials, bool, APIErrorCode) {
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ch, err := parseCredentialHeader("Credential="+r.URL.Query().Get("X-Amz-Credential"), region, stype)
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if err != ErrNone {
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// Strip off the Algorithm prefix.
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v4Auth := strings.TrimPrefix(r.Header.Get("Authorization"), signV4Algorithm)
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authFields := strings.Split(strings.TrimSpace(v4Auth), ",")
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if len(authFields) != 3 {
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return auth.Credentials{}, false, ErrMissingFields
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}
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ch, err = parseCredentialHeader(authFields[0], region, stype)
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if err != ErrNone {
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return auth.Credentials{}, false, err
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}
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}
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return checkKeyValid(ch.accessKey)
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}
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// parse credentialHeader string into its structured form.
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func parseCredentialHeader(credElement string, region string, stype serviceType) (ch credentialHeader, aec APIErrorCode) {
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creds := strings.SplitN(strings.TrimSpace(credElement), "=", 2)
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if len(creds) != 2 {
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return ch, ErrMissingFields
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}
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if creds[0] != "Credential" {
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return ch, ErrMissingCredTag
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}
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credElements := strings.Split(strings.TrimSpace(creds[1]), "/")
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if len(credElements) < 5 {
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return ch, ErrCredMalformed
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}
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accessKey := strings.Join(credElements[:len(credElements)-4], "/") // The access key may contain one or more `/`
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if !auth.IsAccessKeyValid(accessKey) {
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return ch, ErrInvalidAccessKeyID
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}
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// Save access key id.
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cred := credentialHeader{
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accessKey: accessKey,
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}
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credElements = credElements[len(credElements)-4:]
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var e error
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cred.scope.date, e = time.Parse(yyyymmdd, credElements[0])
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if e != nil {
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return ch, ErrMalformedCredentialDate
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}
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cred.scope.region = credElements[1]
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// Verify if region is valid.
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sRegion := cred.scope.region
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// Region is set to be empty, we use whatever was sent by the
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// request and proceed further. This is a work-around to address
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// an important problem for ListBuckets() getting signed with
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// different regions.
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if region == "" {
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region = sRegion
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}
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// Should validate region, only if region is set.
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if !isValidRegion(sRegion, region) {
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return ch, ErrAuthorizationHeaderMalformed
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}
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if credElements[2] != string(stype) {
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return ch, ErrInvalidService
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}
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cred.scope.service = credElements[2]
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if credElements[3] != "aws4_request" {
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return ch, ErrInvalidRequestVersion
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}
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cred.scope.request = credElements[3]
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return cred, ErrNone
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}
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// Parse signature from signature tag.
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func parseSignature(signElement string) (string, APIErrorCode) {
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signFields := strings.Split(strings.TrimSpace(signElement), "=")
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if len(signFields) != 2 {
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return "", ErrMissingFields
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}
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if signFields[0] != "Signature" {
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return "", ErrMissingSignTag
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}
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if signFields[1] == "" {
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return "", ErrMissingFields
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}
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signature := signFields[1]
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return signature, ErrNone
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}
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// Parse slice of signed headers from signed headers tag.
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func parseSignedHeader(signedHdrElement string) ([]string, APIErrorCode) {
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signedHdrFields := strings.Split(strings.TrimSpace(signedHdrElement), "=")
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if len(signedHdrFields) != 2 {
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return nil, ErrMissingFields
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}
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if signedHdrFields[0] != "SignedHeaders" {
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return nil, ErrMissingSignHeadersTag
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}
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if signedHdrFields[1] == "" {
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return nil, ErrMissingFields
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}
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signedHeaders := strings.Split(signedHdrFields[1], ";")
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return signedHeaders, ErrNone
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}
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// signValues data type represents structured form of AWS Signature V4 header.
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type signValues struct {
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Credential credentialHeader
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SignedHeaders []string
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Signature string
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}
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// preSignValues data type represents structued form of AWS Signature V4 query string.
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type preSignValues struct {
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signValues
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Date time.Time
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Expires time.Duration
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}
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// Parses signature version '4' query string of the following form.
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//
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// querystring = X-Amz-Algorithm=algorithm
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// querystring += &X-Amz-Credential= urlencode(accessKey + '/' + credential_scope)
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// querystring += &X-Amz-Date=date
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// querystring += &X-Amz-Expires=timeout interval
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// querystring += &X-Amz-SignedHeaders=signed_headers
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// querystring += &X-Amz-Signature=signature
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//
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// verifies if any of the necessary query params are missing in the presigned request.
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func doesV4PresignParamsExist(query url.Values) APIErrorCode {
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v4PresignQueryParams := []string{"X-Amz-Algorithm", "X-Amz-Credential", "X-Amz-Signature", "X-Amz-Date", "X-Amz-SignedHeaders", "X-Amz-Expires"}
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for _, v4PresignQueryParam := range v4PresignQueryParams {
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if _, ok := query[v4PresignQueryParam]; !ok {
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return ErrInvalidQueryParams
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}
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}
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return ErrNone
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}
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// Parses all the presigned signature values into separate elements.
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func parsePreSignV4(query url.Values, region string, stype serviceType) (psv preSignValues, aec APIErrorCode) {
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// verify whether the required query params exist.
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err := doesV4PresignParamsExist(query)
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if err != ErrNone {
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return psv, err
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}
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// Verify if the query algorithm is supported or not.
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if query.Get("X-Amz-Algorithm") != signV4Algorithm {
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return psv, ErrInvalidQuerySignatureAlgo
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}
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// Initialize signature version '4' structured header.
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preSignV4Values := preSignValues{}
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// Save credential.
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preSignV4Values.Credential, err = parseCredentialHeader("Credential="+query.Get("X-Amz-Credential"), region, stype)
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if err != ErrNone {
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return psv, err
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}
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var e error
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// Save date in native time.Time.
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preSignV4Values.Date, e = time.Parse(iso8601Format, query.Get("X-Amz-Date"))
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if e != nil {
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return psv, ErrMalformedPresignedDate
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}
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// Save expires in native time.Duration.
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preSignV4Values.Expires, e = time.ParseDuration(query.Get("X-Amz-Expires") + "s")
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if e != nil {
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return psv, ErrMalformedExpires
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}
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if preSignV4Values.Expires < 0 {
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return psv, ErrNegativeExpires
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}
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// Check if Expiry time is less than 7 days (value in seconds).
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if preSignV4Values.Expires.Seconds() > 604800 {
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return psv, ErrMaximumExpires
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}
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// Save signed headers.
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preSignV4Values.SignedHeaders, err = parseSignedHeader("SignedHeaders=" + query.Get("X-Amz-SignedHeaders"))
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if err != ErrNone {
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return psv, err
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}
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// Save signature.
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preSignV4Values.Signature, err = parseSignature("Signature=" + query.Get("X-Amz-Signature"))
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if err != ErrNone {
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return psv, err
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}
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// Return structed form of signature query string.
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return preSignV4Values, ErrNone
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}
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// Parses signature version '4' header of the following form.
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//
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// Authorization: algorithm Credential=accessKeyID/credScope, \
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// SignedHeaders=signedHeaders, Signature=signature
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//
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func parseSignV4(v4Auth string, region string, stype serviceType) (sv signValues, aec APIErrorCode) {
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// Replace all spaced strings, some clients can send spaced
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// parameters and some won't. So we pro-actively remove any spaces
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// to make parsing easier.
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v4Auth = strings.Replace(v4Auth, " ", "", -1)
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if v4Auth == "" {
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return sv, ErrAuthHeaderEmpty
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}
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// Verify if the header algorithm is supported or not.
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if !strings.HasPrefix(v4Auth, signV4Algorithm) {
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return sv, ErrSignatureVersionNotSupported
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}
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// Strip off the Algorithm prefix.
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v4Auth = strings.TrimPrefix(v4Auth, signV4Algorithm)
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authFields := strings.Split(strings.TrimSpace(v4Auth), ",")
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if len(authFields) != 3 {
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return sv, ErrMissingFields
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}
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// Initialize signature version '4' structured header.
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signV4Values := signValues{}
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var err APIErrorCode
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// Save credentail values.
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signV4Values.Credential, err = parseCredentialHeader(authFields[0], region, stype)
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if err != ErrNone {
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return sv, err
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}
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// Save signed headers.
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signV4Values.SignedHeaders, err = parseSignedHeader(authFields[1])
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if err != ErrNone {
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return sv, err
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}
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// Save signature.
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signV4Values.Signature, err = parseSignature(authFields[2])
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if err != ErrNone {
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return sv, err
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}
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// Return the structure here.
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return signV4Values, ErrNone
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}
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