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285 lines
8.3 KiB
285 lines
8.3 KiB
/*
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* Minio Cloud Storage, (C) 2015, 2016 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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"encoding/json"
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"io"
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"sync"
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)
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const (
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// Static prefix to be used while constructing bucket ARN.
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// refer to S3 docs for more info.
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bucketARNPrefix = "arn:" + eventSource + ":::"
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// Bucket policy config name.
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bucketPolicyConfig = "policy.json"
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)
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// Variable represents bucket policies in memory.
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var globalBucketPolicies *bucketPolicies
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// Global bucket policies list, policies are enforced on each bucket looking
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// through the policies here.
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type bucketPolicies struct {
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rwMutex *sync.RWMutex
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// Collection of 'bucket' policies.
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bucketPolicyConfigs map[string]*bucketPolicy
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}
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// Represent a policy change
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type policyChange struct {
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// isRemove is true if the policy change is to delete the
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// policy on a bucket.
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IsRemove bool
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// represents the new policy for the bucket
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BktPolicy *bucketPolicy
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}
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// Fetch bucket policy for a given bucket.
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func (bp bucketPolicies) GetBucketPolicy(bucket string) *bucketPolicy {
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bp.rwMutex.RLock()
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defer bp.rwMutex.RUnlock()
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return bp.bucketPolicyConfigs[bucket]
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}
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// Set a new bucket policy for a bucket, this operation will overwrite
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// any previous bucket policies for the bucket.
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func (bp *bucketPolicies) SetBucketPolicy(bucket string, pCh policyChange) error {
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bp.rwMutex.Lock()
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defer bp.rwMutex.Unlock()
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if pCh.IsRemove {
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delete(bp.bucketPolicyConfigs, bucket)
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} else {
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if pCh.BktPolicy == nil {
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return errInvalidArgument
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}
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bp.bucketPolicyConfigs[bucket] = pCh.BktPolicy
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}
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return nil
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}
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// Loads all bucket policies from persistent layer.
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func loadAllBucketPolicies(objAPI ObjectLayer) (policies map[string]*bucketPolicy, err error) {
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// List buckets to proceed loading all notification configuration.
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buckets, err := objAPI.ListBuckets()
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errorIf(err, "Unable to list buckets.")
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if err != nil {
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return nil, errorCause(err)
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}
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policies = make(map[string]*bucketPolicy)
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var pErrs []error
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// Loads bucket policy.
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for _, bucket := range buckets {
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policy, pErr := readBucketPolicy(bucket.Name, objAPI)
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if pErr != nil {
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// net.Dial fails for rpc client or any
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// other unexpected errors during net.Dial.
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if !isErrIgnored(pErr, errDiskNotFound) {
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if !isErrBucketPolicyNotFound(pErr) {
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pErrs = append(pErrs, pErr)
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}
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}
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// Continue to load other bucket policies if possible.
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continue
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}
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policies[bucket.Name] = policy
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}
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// Look for any errors occurred while reading bucket policies.
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for _, pErr := range pErrs {
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if pErr != nil {
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return policies, pErr
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}
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}
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// Success.
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return policies, nil
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}
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// Intialize all bucket policies.
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func initBucketPolicies(objAPI ObjectLayer) error {
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if objAPI == nil {
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return errInvalidArgument
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}
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// Read all bucket policies.
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policies, err := loadAllBucketPolicies(objAPI)
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if err != nil {
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return err
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}
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// Populate global bucket collection.
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globalBucketPolicies = &bucketPolicies{
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rwMutex: &sync.RWMutex{},
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bucketPolicyConfigs: policies,
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}
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// Success.
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return nil
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}
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// readBucketPolicyJSON - reads bucket policy for an input bucket, returns BucketPolicyNotFound
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// if bucket policy is not found.
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func readBucketPolicyJSON(bucket string, objAPI ObjectLayer) (bucketPolicyReader io.Reader, err error) {
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policyPath := pathJoin(bucketConfigPrefix, bucket, bucketPolicyConfig)
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// Acquire a read lock on policy config before reading.
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objLock := globalNSMutex.NewNSLock(minioMetaBucket, policyPath)
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if err = objLock.GetRLock(globalOperationTimeout); err != nil {
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return nil, err
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}
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defer objLock.RUnlock()
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var buffer bytes.Buffer
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err = objAPI.GetObject(minioMetaBucket, policyPath, 0, -1, &buffer)
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if err != nil {
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if isErrObjectNotFound(err) || isErrIncompleteBody(err) {
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return nil, BucketPolicyNotFound{Bucket: bucket}
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}
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errorIf(err, "Unable to load policy for the bucket %s.", bucket)
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return nil, errorCause(err)
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}
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return &buffer, nil
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}
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// readBucketPolicy - reads bucket policy for an input bucket, returns BucketPolicyNotFound
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// if bucket policy is not found. This function also parses the bucket policy into an object.
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func readBucketPolicy(bucket string, objAPI ObjectLayer) (*bucketPolicy, error) {
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// Read bucket policy JSON.
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bucketPolicyReader, err := readBucketPolicyJSON(bucket, objAPI)
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if err != nil {
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return nil, err
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}
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// Parse the saved policy.
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var policy = &bucketPolicy{}
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err = parseBucketPolicy(bucketPolicyReader, policy)
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if err != nil {
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return nil, err
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}
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return policy, nil
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}
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// removeBucketPolicy - removes any previously written bucket policy. Returns BucketPolicyNotFound
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// if no policies are found.
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func removeBucketPolicy(bucket string, objAPI ObjectLayer) error {
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policyPath := pathJoin(bucketConfigPrefix, bucket, bucketPolicyConfig)
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// Acquire a write lock on policy config before modifying.
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objLock := globalNSMutex.NewNSLock(minioMetaBucket, policyPath)
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if err := objLock.GetLock(globalOperationTimeout); err != nil {
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return err
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}
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defer objLock.Unlock()
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if err := objAPI.DeleteObject(minioMetaBucket, policyPath); err != nil {
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errorIf(err, "Unable to remove bucket-policy on bucket %s.", bucket)
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err = errorCause(err)
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if _, ok := err.(ObjectNotFound); ok {
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return BucketPolicyNotFound{Bucket: bucket}
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}
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return err
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}
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return nil
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}
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// writeBucketPolicy - save a bucket policy that is assumed to be validated.
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func writeBucketPolicy(bucket string, objAPI ObjectLayer, bpy *bucketPolicy) error {
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buf, err := json.Marshal(bpy)
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if err != nil {
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errorIf(err, "Unable to marshal bucket policy '%v' to JSON", *bpy)
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return err
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}
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policyPath := pathJoin(bucketConfigPrefix, bucket, bucketPolicyConfig)
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// Acquire a write lock on policy config before modifying.
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objLock := globalNSMutex.NewNSLock(minioMetaBucket, policyPath)
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if err := objLock.GetLock(globalOperationTimeout); err != nil {
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return err
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}
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defer objLock.Unlock()
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if _, err := objAPI.PutObject(minioMetaBucket, policyPath, int64(len(buf)), bytes.NewReader(buf), nil, ""); err != nil {
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errorIf(err, "Unable to set policy for the bucket %s", bucket)
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return errorCause(err)
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}
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return nil
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}
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func parseAndPersistBucketPolicy(bucket string, policyBytes []byte, objAPI ObjectLayer) APIErrorCode {
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// Parse bucket policy.
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var policy = &bucketPolicy{}
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err := parseBucketPolicy(bytes.NewReader(policyBytes), policy)
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if err != nil {
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errorIf(err, "Unable to parse bucket policy.")
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return ErrInvalidPolicyDocument
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}
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// Parse check bucket policy.
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if s3Error := checkBucketPolicyResources(bucket, policy); s3Error != ErrNone {
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return s3Error
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}
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// Acquire a write lock on bucket before modifying its configuration.
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bucketLock := globalNSMutex.NewNSLock(bucket, "")
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if bucketLock.GetLock(globalOperationTimeout) != nil {
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return ErrOperationTimedOut
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}
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// Release lock after notifying peers
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defer bucketLock.Unlock()
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// Save bucket policy.
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if err = persistAndNotifyBucketPolicyChange(bucket, policyChange{false, policy}, objAPI); err != nil {
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switch err.(type) {
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case BucketNameInvalid:
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return ErrInvalidBucketName
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case BucketNotFound:
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return ErrNoSuchBucket
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default:
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errorIf(err, "Unable to save bucket policy.")
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return ErrInternalError
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}
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}
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return ErrNone
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}
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// persistAndNotifyBucketPolicyChange - takes a policyChange argument,
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// persists it to storage, and notify nodes in the cluster about the
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// change. In-memory state is updated in response to the notification.
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func persistAndNotifyBucketPolicyChange(bucket string, pCh policyChange, objAPI ObjectLayer) error {
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if pCh.IsRemove {
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if err := removeBucketPolicy(bucket, objAPI); err != nil {
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return err
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}
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} else {
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if pCh.BktPolicy == nil {
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return errInvalidArgument
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}
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if err := writeBucketPolicy(bucket, objAPI, pCh.BktPolicy); err != nil {
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return err
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}
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}
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// Notify all peers (including self) to update in-memory state
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S3PeersUpdateBucketPolicy(bucket, pCh)
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return nil
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}
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