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https://github.com/minio/minio.git
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Do not list objects unless specified in policy (#6970)
Currently we use GetObject to check if we are allowed to list, this might be a security problem since there are many users now who actively disable a publicly readable listing, anyone who can guess the browser URL can list the objects. This PR turns off this behavior and provides a more expected way based on the policies. This PR also additionally improves the Download() object implementation to use a more streamlined code. These are precursor changes to facilitate federation and web identity support in browser.
This commit is contained in:
Harshavardhana
Nitish Tiwari
parent
50f6f9fe58
commit
c2ed1347d9
@ -271,9 +271,10 @@ func (web *webAPIHandlers) ListBuckets(r *http.Request, args *WebGenericArgs, re
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}
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for _, dnsRecord := range dnsBuckets {
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bucketName := strings.Trim(dnsRecord.Key, "/")
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if globalIAMSys.IsAllowed(iampolicy.Args{
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AccountName: claims.Subject,
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Action: iampolicy.Action(policy.GetObjectAction),
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Action: iampolicy.ListBucketAction,
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BucketName: bucketName,
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ConditionValues: getConditionValues(r, ""),
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IsOwner: owner,
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@ -293,7 +294,7 @@ func (web *webAPIHandlers) ListBuckets(r *http.Request, args *WebGenericArgs, re
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for _, bucket := range buckets {
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if globalIAMSys.IsAllowed(iampolicy.Args{
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AccountName: claims.Subject,
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Action: iampolicy.Action(policy.GetObjectAction),
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Action: iampolicy.ListBucketAction,
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BucketName: bucket.Name,
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ConditionValues: getConditionValues(r, ""),
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IsOwner: owner,
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@ -355,13 +356,17 @@ func (web *webAPIHandlers) ListObjects(r *http.Request, args *ListObjectsArgs, r
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claims, owner, authErr := webRequestAuthenticate(r)
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if authErr != nil {
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if authErr == errNoAuthToken {
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// Add this for checking ListObjects conditional.
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if args.Prefix != "" {
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r.Header.Set("prefix", args.Prefix)
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}
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// Check if anonymous (non-owner) has access to download objects.
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readable := globalPolicySys.IsAllowed(policy.Args{
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Action: policy.GetObjectAction,
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Action: policy.ListBucketAction,
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BucketName: args.BucketName,
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ConditionValues: getConditionValues(r, ""),
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IsOwner: false,
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ObjectName: args.Prefix + "/",
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})
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// Check if anonymous (non-owner) has access to upload objects.
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@ -389,18 +394,22 @@ func (web *webAPIHandlers) ListObjects(r *http.Request, args *ListObjectsArgs, r
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// For authenticated users apply IAM policy.
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if authErr == nil {
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// Add this for checking ListObjects conditional.
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if args.Prefix != "" {
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r.Header.Set("prefix", args.Prefix)
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}
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readable := globalIAMSys.IsAllowed(iampolicy.Args{
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AccountName: claims.Subject,
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Action: iampolicy.Action(policy.GetObjectAction),
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Action: iampolicy.ListBucketAction,
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BucketName: args.BucketName,
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ConditionValues: getConditionValues(r, ""),
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IsOwner: owner,
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ObjectName: args.Prefix + "/",
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})
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writable := globalIAMSys.IsAllowed(iampolicy.Args{
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AccountName: claims.Subject,
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Action: iampolicy.Action(policy.PutObjectAction),
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Action: iampolicy.PutObjectAction,
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BucketName: args.BucketName,
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ConditionValues: getConditionValues(r, ""),
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IsOwner: owner,
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@ -498,7 +507,7 @@ next:
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if !globalIAMSys.IsAllowed(iampolicy.Args{
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AccountName: claims.Subject,
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Action: iampolicy.Action(policy.DeleteObjectAction),
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Action: iampolicy.DeleteObjectAction,
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BucketName: args.BucketName,
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ConditionValues: getConditionValues(r, ""),
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IsOwner: owner,
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@ -515,7 +524,7 @@ next:
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if !globalIAMSys.IsAllowed(iampolicy.Args{
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AccountName: claims.Subject,
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Action: iampolicy.Action(policy.DeleteObjectAction),
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Action: iampolicy.DeleteObjectAction,
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BucketName: args.BucketName,
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ConditionValues: getConditionValues(r, ""),
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IsOwner: owner,
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@ -766,7 +775,7 @@ func (web *webAPIHandlers) Upload(w http.ResponseWriter, r *http.Request) {
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if authErr == nil {
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if !globalIAMSys.IsAllowed(iampolicy.Args{
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AccountName: claims.Subject,
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Action: iampolicy.Action(policy.PutObjectAction),
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Action: iampolicy.PutObjectAction,
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BucketName: bucket,
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ConditionValues: getConditionValues(r, ""),
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IsOwner: owner,
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@ -866,7 +875,6 @@ func (web *webAPIHandlers) Download(w http.ResponseWriter, r *http.Request) {
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defer logger.AuditLog(w, r, "WebDownload", mustGetClaimsFromToken(r))
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var wg sync.WaitGroup
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objectAPI := web.ObjectAPI()
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if objectAPI == nil {
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writeWebErrorResponse(w, errServerNotInitialized)
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@ -902,7 +910,7 @@ func (web *webAPIHandlers) Download(w http.ResponseWriter, r *http.Request) {
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if authErr == nil {
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if !globalIAMSys.IsAllowed(iampolicy.Args{
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AccountName: claims.Subject,
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Action: iampolicy.Action(policy.GetObjectAction),
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Action: iampolicy.GetObjectAction,
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BucketName: bucket,
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ConditionValues: getConditionValues(r, ""),
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IsOwner: owner,
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@ -913,101 +921,67 @@ func (web *webAPIHandlers) Download(w http.ResponseWriter, r *http.Request) {
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}
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}
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opts := ObjectOptions{}
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getObjectInfo := objectAPI.GetObjectInfo
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getObject := objectAPI.GetObject
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getObjectNInfo := objectAPI.GetObjectNInfo
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if web.CacheAPI() != nil {
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getObjectInfo = web.CacheAPI().GetObjectInfo
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getObject = web.CacheAPI().GetObject
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getObjectNInfo = web.CacheAPI().GetObjectNInfo
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}
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objInfo, err := getObjectInfo(ctx, bucket, object, opts)
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var opts ObjectOptions
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gr, err := getObjectNInfo(ctx, bucket, object, nil, r.Header, readLock, opts)
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if err != nil {
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writeWebErrorResponse(w, err)
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return
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}
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length := objInfo.Size
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var actualSize int64
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if objInfo.IsCompressed() {
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// Read the decompressed size from the meta.json.
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actualSize = objInfo.GetActualSize()
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if actualSize < 0 {
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return
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}
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}
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defer gr.Close()
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objInfo := gr.ObjInfo
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if objectAPI.IsEncryptionSupported() {
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if _, err = DecryptObjectInfo(&objInfo, r.Header); err != nil {
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writeWebErrorResponse(w, err)
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return
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}
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}
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// Set encryption response headers
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if objectAPI.IsEncryptionSupported() {
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if crypto.IsEncrypted(objInfo.UserDefined) {
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length, _ = objInfo.DecryptedSize()
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switch {
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case crypto.S3.IsEncrypted(objInfo.UserDefined):
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w.Header().Set(crypto.SSEHeader, crypto.SSEAlgorithmAES256)
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case crypto.SSEC.IsEncrypted(objInfo.UserDefined):
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w.Header().Set(crypto.SSECAlgorithm, r.Header.Get(crypto.SSECAlgorithm))
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w.Header().Set(crypto.SSECKeyMD5, r.Header.Get(crypto.SSECKeyMD5))
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}
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}
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}
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var startOffset int64
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var writer io.Writer
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if objInfo.IsCompressed() {
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// The decompress metrics are set.
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snappyStartOffset := 0
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snappyLength := actualSize
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// Open a pipe for compression
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// Where compressWriter is actually passed to the getObject
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decompressReader, compressWriter := io.Pipe()
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snappyReader := snappy.NewReader(decompressReader)
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// The limit is set to the actual size.
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responseWriter := ioutil.LimitedWriter(w, int64(snappyStartOffset), snappyLength)
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wg.Add(1) //For closures.
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go func() {
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defer wg.Done()
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// Finally, writes to the client.
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_, perr := io.Copy(responseWriter, snappyReader)
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// Close the compressWriter if the data is read already.
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// Closing the pipe, releases the writer passed to the getObject.
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compressWriter.CloseWithError(perr)
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}()
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writer = compressWriter
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} else {
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writer = w
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}
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if objectAPI.IsEncryptionSupported() && crypto.S3.IsEncrypted(objInfo.UserDefined) {
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// Response writer should be limited early on for decryption upto required length,
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// additionally also skipping mod(offset)64KiB boundaries.
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writer = ioutil.LimitedWriter(writer, startOffset%(64*1024), length)
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writer, startOffset, length, err = DecryptBlocksRequest(writer, r, bucket, object, startOffset, length, objInfo, false)
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if err != nil {
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writeWebErrorResponse(w, err)
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return
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}
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w.Header().Set(crypto.SSEHeader, crypto.SSEAlgorithmAES256)
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}
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httpWriter := ioutil.WriteOnClose(writer)
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// Add content disposition.
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w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", path.Base(object)))
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if err = getObject(ctx, bucket, object, 0, -1, httpWriter, "", opts); err != nil {
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httpWriter.Close()
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if objInfo.IsCompressed() {
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wg.Wait()
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}
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/// No need to print error, response writer already written to.
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if err = setObjectHeaders(w, objInfo, nil); err != nil {
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writeWebErrorResponse(w, err)
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return
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}
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// Add content disposition.
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w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", path.Base(objInfo.Name)))
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setHeadGetRespHeaders(w, r.URL.Query())
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httpWriter := ioutil.WriteOnClose(w)
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// Write object content to response body
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if _, err = io.Copy(httpWriter, gr); err != nil {
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if !httpWriter.HasWritten() { // write error response only if no data or headers has been written to client yet
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writeWebErrorResponse(w, err)
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}
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return
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}
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if err = httpWriter.Close(); err != nil {
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if !httpWriter.HasWritten() { // write error response only if no data has been written to client yet
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if !httpWriter.HasWritten() { // write error response only if no data or headers has been written to client yet
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writeWebErrorResponse(w, err)
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return
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}
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}
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if objInfo.IsCompressed() {
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// Wait for decompression go-routine to retire.
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wg.Wait()
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}
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// Get host and port from Request.RemoteAddr.
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host, port, err := net.SplitHostPort(handlers.GetSourceIP(r))
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@ -1093,7 +1067,7 @@ func (web *webAPIHandlers) DownloadZip(w http.ResponseWriter, r *http.Request) {
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for _, object := range args.Objects {
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if !globalIAMSys.IsAllowed(iampolicy.Args{
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AccountName: claims.Subject,
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Action: iampolicy.Action(policy.GetObjectAction),
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Action: iampolicy.GetObjectAction,
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BucketName: args.BucketName,
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ConditionValues: getConditionValues(r, ""),
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IsOwner: owner,
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@ -539,8 +539,8 @@ func testListObjectsWebHandler(obj ObjectLayer, instanceType string, t TestErrHa
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Statements: []policy.Statement{policy.NewStatement(
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policy.Allow,
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policy.NewPrincipal("*"),
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policy.NewActionSet(policy.GetObjectAction),
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policy.NewResourceSet(policy.NewResource(bucketName, "*")),
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policy.NewActionSet(policy.ListBucketAction),
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policy.NewResourceSet(policy.NewResource(bucketName, "")),
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condition.NewFunctions(),
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)},
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}
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