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Copy pathbucket-policy.go
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228 lines (197 loc) · 6.27 KB
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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"encoding/json"
"net/http"
"net/url"
"strconv"
"strings"
"time"
jsoniter "github.com/json-iterator/go"
miniogopolicy "github.com/minio/minio-go/v7/pkg/policy"
"github.com/minio/minio/internal/handlers"
xhttp "github.com/minio/minio/internal/http"
"github.com/minio/minio/internal/logger"
"github.com/minio/pkg/bucket/policy"
)
// PolicySys - policy subsystem.
type PolicySys struct{}
// Get returns stored bucket policy
func (sys *PolicySys) Get(bucket string) (*policy.Policy, error) {
return globalBucketMetadataSys.GetPolicyConfig(bucket)
}
// IsAllowed - checks given policy args is allowed to continue the Rest API.
func (sys *PolicySys) IsAllowed(args policy.Args) bool {
p, err := sys.Get(args.BucketName)
if err == nil {
return p.IsAllowed(args)
}
// Log unhandled errors.
if _, ok := err.(BucketPolicyNotFound); !ok {
logger.LogIf(GlobalContext, err)
}
// As policy is not available for given bucket name, returns IsOwner i.e.
// operation is allowed only for owner.
return args.IsOwner
}
// NewPolicySys - creates new policy system.
func NewPolicySys() *PolicySys {
return &PolicySys{}
}
func getConditionValues(r *http.Request, lc string, username string, claims map[string]interface{}) map[string][]string {
currTime := UTCNow()
principalType := "Anonymous"
if username != "" {
principalType = "User"
if len(claims) > 0 {
principalType = "AssumedRole"
}
if username == globalActiveCred.AccessKey {
principalType = "Account"
}
}
vid := r.Form.Get(xhttp.VersionID)
if vid == "" {
if u, err := url.Parse(r.Header.Get(xhttp.AmzCopySource)); err == nil {
vid = u.Query().Get(xhttp.VersionID)
}
}
authType := getRequestAuthType(r)
var signatureVersion string
switch authType {
case authTypeSignedV2, authTypePresignedV2:
signatureVersion = signV2Algorithm
case authTypeSigned, authTypePresigned, authTypeStreamingSigned, authTypePostPolicy:
signatureVersion = signV4Algorithm
}
var authtype string
switch authType {
case authTypePresignedV2, authTypePresigned:
authtype = "REST-QUERY-STRING"
case authTypeSignedV2, authTypeSigned, authTypeStreamingSigned:
authtype = "REST-HEADER"
case authTypePostPolicy:
authtype = "POST"
}
args := map[string][]string{
"CurrentTime": {currTime.Format(time.RFC3339)},
"EpochTime": {strconv.FormatInt(currTime.Unix(), 10)},
"SecureTransport": {strconv.FormatBool(r.TLS != nil)},
"SourceIp": {handlers.GetSourceIP(r)},
"UserAgent": {r.UserAgent()},
"Referer": {r.Referer()},
"principaltype": {principalType},
"userid": {username},
"username": {username},
"versionid": {vid},
"signatureversion": {signatureVersion},
"authType": {authtype},
}
if lc != "" {
args["LocationConstraint"] = []string{lc}
}
cloneHeader := r.Header.Clone()
for _, objLock := range []string{
xhttp.AmzObjectLockMode,
xhttp.AmzObjectLockLegalHold,
xhttp.AmzObjectLockRetainUntilDate,
} {
if values, ok := cloneHeader[objLock]; ok {
args[strings.TrimPrefix(objLock, "X-Amz-")] = values
}
cloneHeader.Del(objLock)
}
for key, values := range cloneHeader {
if existingValues, found := args[key]; found {
args[key] = append(existingValues, values...)
} else {
args[key] = values
}
}
cloneURLValues := make(url.Values, len(r.Form))
for k, v := range r.Form {
cloneURLValues[k] = v
}
for _, objLock := range []string{
xhttp.AmzObjectLockMode,
xhttp.AmzObjectLockLegalHold,
xhttp.AmzObjectLockRetainUntilDate,
} {
if values, ok := cloneURLValues[objLock]; ok {
args[strings.TrimPrefix(objLock, "X-Amz-")] = values
}
cloneURLValues.Del(objLock)
}
for key, values := range cloneURLValues {
if existingValues, found := args[key]; found {
args[key] = append(existingValues, values...)
} else {
args[key] = values
}
}
// JWT specific values
for k, v := range claims {
vStr, ok := v.(string)
if ok {
// Special case for AD/LDAP STS users
switch k {
case ldapUser:
args["user"] = []string{vStr}
case ldapUserN:
args["username"] = []string{vStr}
default:
args[k] = []string{vStr}
}
}
}
return args
}
// PolicyToBucketAccessPolicy converts a MinIO policy into a minio-go policy data structure.
func PolicyToBucketAccessPolicy(bucketPolicy *policy.Policy) (*miniogopolicy.BucketAccessPolicy, error) {
// Return empty BucketAccessPolicy for empty bucket policy.
if bucketPolicy == nil {
return &miniogopolicy.BucketAccessPolicy{Version: policy.DefaultVersion}, nil
}
data, err := json.Marshal(bucketPolicy)
if err != nil {
// This should not happen because bucketPolicy is valid to convert to JSON data.
return nil, err
}
var policyInfo miniogopolicy.BucketAccessPolicy
json := jsoniter.ConfigCompatibleWithStandardLibrary
if err = json.Unmarshal(data, &policyInfo); err != nil {
// This should not happen because data is valid to JSON data.
return nil, err
}
return &policyInfo, nil
}
// BucketAccessPolicyToPolicy - converts minio-go/policy.BucketAccessPolicy to policy.Policy.
func BucketAccessPolicyToPolicy(policyInfo *miniogopolicy.BucketAccessPolicy) (*policy.Policy, error) {
data, err := json.Marshal(policyInfo)
if err != nil {
// This should not happen because policyInfo is valid to convert to JSON data.
return nil, err
}
var bucketPolicy policy.Policy
json := jsoniter.ConfigCompatibleWithStandardLibrary
if err = json.Unmarshal(data, &bucketPolicy); err != nil {
// This should not happen because data is valid to JSON data.
return nil, err
}
return &bucketPolicy, nil
}