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HDFS-10276. HDFS should not expose path info that user has no permission to see. (Yuanbo Liu via Yongjun Zhang) 

(cherry picked from commit 5ea6fd85c7)
This commit is contained in:
Yongjun Zhang 2016-05-27 10:02:02 -07:00
parent 01e7c2bbe4
commit 3e4c7906c2
2 changed files with 26 additions and 11 deletions
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24
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSPermissionChecker.java
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@ -196,9 +196,9 @@ class FSPermissionChecker implements AccessControlEnforcer {
* Check whether exception e is due to an ancestor inode's not being * Check whether exception e is due to an ancestor inode's not being
* directory. * directory.
*/ */
private void checkAncestorType(INode[] inodes, int ancestorIndex, private void checkAncestorType(INode[] inodes, int checkedAncestorIndex,
AccessControlException e) throws AccessControlException { AccessControlException e) throws AccessControlException {
for (int i = 0; i <= ancestorIndex; i++) { for (int i = 0; i <= checkedAncestorIndex; i++) {
if (inodes[i] == null) { if (inodes[i] == null) {
break; break;
} }
@ -221,11 +221,8 @@ class FSPermissionChecker implements AccessControlEnforcer {
throws AccessControlException { throws AccessControlException {
for(; ancestorIndex >= 0 && inodes[ancestorIndex] == null; for(; ancestorIndex >= 0 && inodes[ancestorIndex] == null;
ancestorIndex--); ancestorIndex--);
try {
checkTraverse(inodeAttrs, path, ancestorIndex); checkTraverse(inodeAttrs, inodes, path, ancestorIndex);
} catch (AccessControlException e) {
checkAncestorType(inodes, ancestorIndex, e);
}
final INodeAttributes last = inodeAttrs[inodeAttrs.length - 1]; final INodeAttributes last = inodeAttrs[inodeAttrs.length - 1];
if (parentAccess != null && parentAccess.implies(FsAction.WRITE) if (parentAccess != null && parentAccess.implies(FsAction.WRITE)
@ -276,10 +273,15 @@ class FSPermissionChecker implements AccessControlEnforcer {
} }
/** Guarded by {@link FSNamesystem#readLock()} */ /** Guarded by {@link FSNamesystem#readLock()} */
private void checkTraverse(INodeAttributes[] inodes, String path, int last private void checkTraverse(INodeAttributes[] inodeAttrs, INode[] inodes,
) throws AccessControlException { String path, int last) throws AccessControlException {
for(int j = 0; j <= last; j++) { int j = 0;
check(inodes[j], path, FsAction.EXECUTE); try {
for (; j <= last; j++) {
check(inodeAttrs[j], path, FsAction.EXECUTE);
}
} catch (AccessControlException e) {
checkAncestorType(inodes, j, e);
} }
} }

13
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSPermission.java
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@ -560,6 +560,19 @@ public class TestDFSPermission {
+ "a directory, when checked on /existing_file/non_existing_name", + "a directory, when checked on /existing_file/non_existing_name",
e.getMessage().contains("is not a directory")); e.getMessage().contains("is not a directory"));
} }
rootFs.setPermission(p4, new FsPermission("600"));
try {
fs.exists(nfpath);
fail("The exists call should have failed.");
} catch (AccessControlException e) {
assertTrue("Permission denied messages must carry file path",
e.getMessage().contains(fpath.getName()));
assertFalse("Permission denied messages should not specify existing_file"
+ " is not a directory, since the user does not have permission"
+ " on /p4",
e.getMessage().contains("is not a directory"));
}
} }
/* Check if namenode performs permission checking correctly /* Check if namenode performs permission checking correctly