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517 lines
17 KiB
517 lines
17 KiB
/*
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* MinIO Cloud Storage, (C) 2015-2018 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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"bytes"
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"context"
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"crypto/subtle"
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"encoding/base64"
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"encoding/hex"
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"errors"
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"io"
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"io/ioutil"
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"net/http"
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"strings"
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xhttp "github.com/minio/minio/cmd/http"
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xjwt "github.com/minio/minio/cmd/jwt"
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"github.com/minio/minio/cmd/logger"
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"github.com/minio/minio/pkg/auth"
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"github.com/minio/minio/pkg/bucket/policy"
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"github.com/minio/minio/pkg/hash"
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iampolicy "github.com/minio/minio/pkg/iam/policy"
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)
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// Verify if request has JWT.
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func isRequestJWT(r *http.Request) bool {
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return strings.HasPrefix(r.Header.Get(xhttp.Authorization), jwtAlgorithm)
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}
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// Verify if request has AWS Signature Version '4'.
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func isRequestSignatureV4(r *http.Request) bool {
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return strings.HasPrefix(r.Header.Get(xhttp.Authorization), signV4Algorithm)
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}
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// Verify if request has AWS Signature Version '2'.
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func isRequestSignatureV2(r *http.Request) bool {
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return (!strings.HasPrefix(r.Header.Get(xhttp.Authorization), signV4Algorithm) &&
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strings.HasPrefix(r.Header.Get(xhttp.Authorization), signV2Algorithm))
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}
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// Verify if request has AWS PreSign Version '4'.
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func isRequestPresignedSignatureV4(r *http.Request) bool {
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_, ok := r.URL.Query()[xhttp.AmzCredential]
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return ok
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}
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// Verify request has AWS PreSign Version '2'.
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func isRequestPresignedSignatureV2(r *http.Request) bool {
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_, ok := r.URL.Query()[xhttp.AmzAccessKeyID]
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return ok
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}
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// Verify if request has AWS Post policy Signature Version '4'.
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func isRequestPostPolicySignatureV4(r *http.Request) bool {
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return strings.Contains(r.Header.Get(xhttp.ContentType), "multipart/form-data") &&
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r.Method == http.MethodPost
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}
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// Verify if the request has AWS Streaming Signature Version '4'. This is only valid for 'PUT' operation.
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func isRequestSignStreamingV4(r *http.Request) bool {
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return r.Header.Get(xhttp.AmzContentSha256) == streamingContentSHA256 &&
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r.Method == http.MethodPut
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}
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// Authorization type.
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type authType int
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// List of all supported auth types.
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const (
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authTypeUnknown authType = iota
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authTypeAnonymous
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authTypePresigned
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authTypePresignedV2
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authTypePostPolicy
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authTypeStreamingSigned
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authTypeSigned
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authTypeSignedV2
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authTypeJWT
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authTypeSTS
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)
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// Get request authentication type.
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func getRequestAuthType(r *http.Request) authType {
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if isRequestSignatureV2(r) {
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return authTypeSignedV2
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} else if isRequestPresignedSignatureV2(r) {
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return authTypePresignedV2
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} else if isRequestSignStreamingV4(r) {
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return authTypeStreamingSigned
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} else if isRequestSignatureV4(r) {
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return authTypeSigned
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} else if isRequestPresignedSignatureV4(r) {
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return authTypePresigned
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} else if isRequestJWT(r) {
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return authTypeJWT
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} else if isRequestPostPolicySignatureV4(r) {
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return authTypePostPolicy
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} else if _, ok := r.URL.Query()[xhttp.Action]; ok {
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return authTypeSTS
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} else if _, ok := r.Header[xhttp.Authorization]; !ok {
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return authTypeAnonymous
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}
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return authTypeUnknown
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}
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// checkAdminRequestAuthType checks whether the request is a valid signature V2 or V4 request.
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// It does not accept presigned or JWT or anonymous requests.
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func checkAdminRequestAuthType(ctx context.Context, r *http.Request, action iampolicy.AdminAction, region string) (auth.Credentials, APIErrorCode) {
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var cred auth.Credentials
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var owner bool
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s3Err := ErrAccessDenied
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if _, ok := r.Header[xhttp.AmzContentSha256]; ok &&
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getRequestAuthType(r) == authTypeSigned && !skipContentSha256Cksum(r) {
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// We only support admin credentials to access admin APIs.
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cred, owner, s3Err = getReqAccessKeyV4(r, region, serviceS3)
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if s3Err != ErrNone {
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return cred, s3Err
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}
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// we only support V4 (no presign) with auth body
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s3Err = isReqAuthenticated(ctx, r, region, serviceS3)
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}
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if s3Err != ErrNone {
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reqInfo := (&logger.ReqInfo{}).AppendTags("requestHeaders", dumpRequest(r))
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ctx := logger.SetReqInfo(ctx, reqInfo)
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logger.LogIf(ctx, errors.New(getAPIError(s3Err).Description), logger.Application)
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}
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var claims map[string]interface{}
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claims, s3Err = checkClaimsFromToken(r, cred)
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if s3Err != ErrNone {
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return cred, s3Err
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}
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if globalIAMSys.IsAllowed(iampolicy.Args{
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AccountName: cred.AccessKey,
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Action: iampolicy.Action(action),
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ConditionValues: getConditionValues(r, "", cred.AccessKey, claims),
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IsOwner: owner,
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Claims: claims,
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}) {
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// Request is allowed return the appropriate access key.
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return cred, ErrNone
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}
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return cred, ErrAccessDenied
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}
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// Fetch the security token set by the client.
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func getSessionToken(r *http.Request) (token string) {
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token = r.Header.Get(xhttp.AmzSecurityToken)
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if token != "" {
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return token
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}
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return r.URL.Query().Get(xhttp.AmzSecurityToken)
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}
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// Fetch claims in the security token returned by the client, doesn't return
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// errors - upon errors the returned claims map will be empty.
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func mustGetClaimsFromToken(r *http.Request) map[string]interface{} {
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claims, _ := getClaimsFromToken(r)
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return claims
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}
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// Fetch claims in the security token returned by the client.
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func getClaimsFromToken(r *http.Request) (map[string]interface{}, error) {
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claims := xjwt.NewMapClaims()
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token := getSessionToken(r)
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if token == "" {
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return claims.Map(), nil
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}
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stsTokenCallback := func(claims *xjwt.MapClaims) ([]byte, error) {
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// JWT token for x-amz-security-token is signed with admin
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// secret key, temporary credentials become invalid if
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// server admin credentials change. This is done to ensure
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// that clients cannot decode the token using the temp
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// secret keys and generate an entirely new claim by essentially
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// hijacking the policies. We need to make sure that this is
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// based an admin credential such that token cannot be decoded
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// on the client side and is treated like an opaque value.
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return []byte(globalActiveCred.SecretKey), nil
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}
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if err := xjwt.ParseWithClaims(token, claims, stsTokenCallback); err != nil {
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return nil, errAuthentication
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}
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if globalPolicyOPA == nil {
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// If OPA is not set and if ldap claim key is set, allow the claim.
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if _, ok := claims.Lookup(ldapUser); ok {
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return claims.Map(), nil
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}
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// If OPA is not set, session token should
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// have a policy and its mandatory, reject
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// requests without policy claim.
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_, pokOpenID := claims.Lookup(iamPolicyClaimNameOpenID())
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_, pokSA := claims.Lookup(iamPolicyClaimNameSA())
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if !pokOpenID && !pokSA {
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return nil, errAuthentication
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}
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sp, spok := claims.Lookup(iampolicy.SessionPolicyName)
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if !spok {
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return claims.Map(), nil
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}
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// Looks like subpolicy is set and is a string, if set then its
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// base64 encoded, decode it. Decoding fails reject such requests.
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spBytes, err := base64.StdEncoding.DecodeString(sp)
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if err != nil {
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// Base64 decoding fails, we should log to indicate
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// something is malforming the request sent by client.
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logger.LogIf(r.Context(), err, logger.Application)
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return nil, errAuthentication
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}
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claims.MapClaims[iampolicy.SessionPolicyName] = string(spBytes)
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}
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return claims.Map(), nil
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}
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// Fetch claims in the security token returned by the client and validate the token.
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func checkClaimsFromToken(r *http.Request, cred auth.Credentials) (map[string]interface{}, APIErrorCode) {
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token := getSessionToken(r)
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if token != "" && cred.AccessKey == "" {
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return nil, ErrNoAccessKey
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}
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if subtle.ConstantTimeCompare([]byte(token), []byte(cred.SessionToken)) != 1 {
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return nil, ErrInvalidToken
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}
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claims, err := getClaimsFromToken(r)
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if err != nil {
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return nil, toAPIErrorCode(r.Context(), err)
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}
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return claims, ErrNone
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}
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// Check request auth type verifies the incoming http request
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// - validates the request signature
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// - validates the policy action if anonymous tests bucket policies if any,
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// for authenticated requests validates IAM policies.
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// returns APIErrorCode if any to be replied to the client.
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func checkRequestAuthType(ctx context.Context, r *http.Request, action policy.Action, bucketName, objectName string) (s3Err APIErrorCode) {
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_, _, s3Err = checkRequestAuthTypeToAccessKey(ctx, r, action, bucketName, objectName)
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return s3Err
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}
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// Check request auth type verifies the incoming http request
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// - validates the request signature
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// - validates the policy action if anonymous tests bucket policies if any,
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// for authenticated requests validates IAM policies.
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// returns APIErrorCode if any to be replied to the client.
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// Additionally returns the accessKey used in the request, and if this request is by an admin.
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func checkRequestAuthTypeToAccessKey(ctx context.Context, r *http.Request, action policy.Action, bucketName, objectName string) (accessKey string, owner bool, s3Err APIErrorCode) {
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var cred auth.Credentials
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switch getRequestAuthType(r) {
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case authTypeUnknown, authTypeStreamingSigned:
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return accessKey, owner, ErrAccessDenied
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case authTypePresignedV2, authTypeSignedV2:
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if s3Err = isReqAuthenticatedV2(r); s3Err != ErrNone {
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return accessKey, owner, s3Err
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}
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cred, owner, s3Err = getReqAccessKeyV2(r)
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case authTypeSigned, authTypePresigned:
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region := globalServerRegion
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switch action {
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case policy.GetBucketLocationAction, policy.ListAllMyBucketsAction:
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region = ""
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}
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if s3Err = isReqAuthenticated(ctx, r, region, serviceS3); s3Err != ErrNone {
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return accessKey, owner, s3Err
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}
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cred, owner, s3Err = getReqAccessKeyV4(r, region, serviceS3)
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}
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if s3Err != ErrNone {
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return accessKey, owner, s3Err
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}
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var claims map[string]interface{}
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claims, s3Err = checkClaimsFromToken(r, cred)
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if s3Err != ErrNone {
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return accessKey, owner, s3Err
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}
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// LocationConstraint is valid only for CreateBucketAction.
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var locationConstraint string
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if action == policy.CreateBucketAction {
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// To extract region from XML in request body, get copy of request body.
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payload, err := ioutil.ReadAll(io.LimitReader(r.Body, maxLocationConstraintSize))
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if err != nil {
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logger.LogIf(ctx, err, logger.Application)
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return accessKey, owner, ErrMalformedXML
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}
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// Populate payload to extract location constraint.
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r.Body = ioutil.NopCloser(bytes.NewReader(payload))
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var s3Error APIErrorCode
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locationConstraint, s3Error = parseLocationConstraint(r)
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if s3Error != ErrNone {
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return accessKey, owner, s3Error
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}
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// Populate payload again to handle it in HTTP handler.
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r.Body = ioutil.NopCloser(bytes.NewReader(payload))
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}
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if cred.AccessKey == "" {
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if globalPolicySys.IsAllowed(policy.Args{
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AccountName: cred.AccessKey,
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Action: action,
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BucketName: bucketName,
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ConditionValues: getConditionValues(r, locationConstraint, "", nil),
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IsOwner: false,
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ObjectName: objectName,
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}) {
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// Request is allowed return the appropriate access key.
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return cred.AccessKey, owner, ErrNone
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}
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return accessKey, owner, ErrAccessDenied
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}
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if globalIAMSys.IsAllowed(iampolicy.Args{
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AccountName: cred.AccessKey,
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Action: iampolicy.Action(action),
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BucketName: bucketName,
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ConditionValues: getConditionValues(r, "", cred.AccessKey, claims),
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ObjectName: objectName,
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IsOwner: owner,
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Claims: claims,
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}) {
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// Request is allowed return the appropriate access key.
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return cred.AccessKey, owner, ErrNone
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}
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return accessKey, owner, ErrAccessDenied
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}
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// Verify if request has valid AWS Signature Version '2'.
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func isReqAuthenticatedV2(r *http.Request) (s3Error APIErrorCode) {
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if isRequestSignatureV2(r) {
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return doesSignV2Match(r)
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}
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return doesPresignV2SignatureMatch(r)
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}
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func reqSignatureV4Verify(r *http.Request, region string, stype serviceType) (s3Error APIErrorCode) {
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sha256sum := getContentSha256Cksum(r, stype)
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switch {
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case isRequestSignatureV4(r):
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return doesSignatureMatch(sha256sum, r, region, stype)
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case isRequestPresignedSignatureV4(r):
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return doesPresignedSignatureMatch(sha256sum, r, region, stype)
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default:
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return ErrAccessDenied
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}
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}
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// Verify if request has valid AWS Signature Version '4'.
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func isReqAuthenticated(ctx context.Context, r *http.Request, region string, stype serviceType) (s3Error APIErrorCode) {
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if errCode := reqSignatureV4Verify(r, region, stype); errCode != ErrNone {
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return errCode
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}
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var (
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err error
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contentMD5, contentSHA256 []byte
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)
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// Extract 'Content-Md5' if present.
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contentMD5, err = checkValidMD5(r.Header)
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if err != nil {
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return ErrInvalidDigest
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}
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// Extract either 'X-Amz-Content-Sha256' header or 'X-Amz-Content-Sha256' query parameter (if V4 presigned)
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// Do not verify 'X-Amz-Content-Sha256' if skipSHA256.
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if skipSHA256 := skipContentSha256Cksum(r); !skipSHA256 && isRequestPresignedSignatureV4(r) {
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if sha256Sum, ok := r.URL.Query()[xhttp.AmzContentSha256]; ok && len(sha256Sum) > 0 {
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contentSHA256, err = hex.DecodeString(sha256Sum[0])
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if err != nil {
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return ErrContentSHA256Mismatch
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}
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}
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} else if _, ok := r.Header[xhttp.AmzContentSha256]; !skipSHA256 && ok {
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contentSHA256, err = hex.DecodeString(r.Header.Get(xhttp.AmzContentSha256))
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if err != nil || len(contentSHA256) == 0 {
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return ErrContentSHA256Mismatch
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}
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}
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// Verify 'Content-Md5' and/or 'X-Amz-Content-Sha256' if present.
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// The verification happens implicit during reading.
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reader, err := hash.NewReader(r.Body, -1, hex.EncodeToString(contentMD5),
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hex.EncodeToString(contentSHA256), -1, globalCLIContext.StrictS3Compat)
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if err != nil {
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return toAPIErrorCode(ctx, err)
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}
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r.Body = ioutil.NopCloser(reader)
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return ErrNone
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}
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// authHandler - handles all the incoming authorization headers and validates them if possible.
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type authHandler struct {
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handler http.Handler
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}
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// setAuthHandler to validate authorization header for the incoming request.
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func setAuthHandler(h http.Handler) http.Handler {
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return authHandler{h}
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}
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// List of all support S3 auth types.
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var supportedS3AuthTypes = map[authType]struct{}{
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authTypeAnonymous: {},
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authTypePresigned: {},
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authTypePresignedV2: {},
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authTypeSigned: {},
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authTypeSignedV2: {},
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authTypePostPolicy: {},
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authTypeStreamingSigned: {},
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}
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// Validate if the authType is valid and supported.
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func isSupportedS3AuthType(aType authType) bool {
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_, ok := supportedS3AuthTypes[aType]
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return ok
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}
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// handler for validating incoming authorization headers.
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func (a authHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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aType := getRequestAuthType(r)
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if isSupportedS3AuthType(aType) {
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// Let top level caller validate for anonymous and known signed requests.
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a.handler.ServeHTTP(w, r)
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return
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} else if aType == authTypeJWT {
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// Validate Authorization header if its valid for JWT request.
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if _, _, authErr := webRequestAuthenticate(r); authErr != nil {
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w.WriteHeader(http.StatusUnauthorized)
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return
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}
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a.handler.ServeHTTP(w, r)
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return
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} else if aType == authTypeSTS {
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a.handler.ServeHTTP(w, r)
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return
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}
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writeErrorResponse(r.Context(), w, errorCodes.ToAPIErr(ErrSignatureVersionNotSupported), r.URL, guessIsBrowserReq(r))
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}
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// isPutActionAllowed - check if PUT operation is allowed on the resource, this
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// call verifies bucket policies and IAM policies, supports multi user
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// checks etc.
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func isPutActionAllowed(atype authType, bucketName, objectName string, r *http.Request, action iampolicy.Action) (s3Err APIErrorCode) {
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var cred auth.Credentials
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var owner bool
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switch atype {
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case authTypeUnknown:
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return ErrAccessDenied
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case authTypeSignedV2, authTypePresignedV2:
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cred, owner, s3Err = getReqAccessKeyV2(r)
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case authTypeStreamingSigned, authTypePresigned, authTypeSigned:
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region := globalServerRegion
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cred, owner, s3Err = getReqAccessKeyV4(r, region, serviceS3)
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}
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if s3Err != ErrNone {
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return s3Err
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}
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|
|
claims, s3Err := checkClaimsFromToken(r, cred)
|
|
if s3Err != ErrNone {
|
|
return s3Err
|
|
}
|
|
|
|
if cred.AccessKey == "" {
|
|
if globalPolicySys.IsAllowed(policy.Args{
|
|
AccountName: cred.AccessKey,
|
|
Action: policy.PutObjectAction,
|
|
BucketName: bucketName,
|
|
ConditionValues: getConditionValues(r, "", "", nil),
|
|
IsOwner: false,
|
|
ObjectName: objectName,
|
|
}) {
|
|
return ErrNone
|
|
}
|
|
return ErrAccessDenied
|
|
}
|
|
|
|
if globalIAMSys.IsAllowed(iampolicy.Args{
|
|
AccountName: cred.AccessKey,
|
|
Action: action,
|
|
BucketName: bucketName,
|
|
ConditionValues: getConditionValues(r, "", cred.AccessKey, claims),
|
|
ObjectName: objectName,
|
|
IsOwner: owner,
|
|
Claims: claims,
|
|
}) {
|
|
return ErrNone
|
|
}
|
|
return ErrAccessDenied
|
|
}
|
|
|