/// <exception cref="Org.Apache.Hadoop.Security.AccessControlException"/>
private void Check(INodeAttributes inode, string path, FsAction access)
{
if (inode == null)
{
return;
}
FsPermission mode = inode.GetFsPermission();
AclFeature aclFeature = inode.GetAclFeature();
if (aclFeature != null)
{
// It's possible that the inode has a default ACL but no access ACL.
int firstEntry = aclFeature.GetEntryAt(0);
if (AclEntryStatusFormat.GetScope(firstEntry) == AclEntryScope.Access)
{
CheckAccessAcl(inode, path, access, mode, aclFeature);
return;
}
}
if (GetUser().Equals(inode.GetUserName()))
{
//user class
if (mode.GetUserAction().Implies(access))
{
return;
}
}
else
{
if (GetGroups().Contains(inode.GetGroupName()))
{
//group class
if (mode.GetGroupAction().Implies(access))
{
return;
}
}
else
{
//other class
if (mode.GetOtherAction().Implies(access))
{
return;
}
}
}
throw new AccessControlException(ToAccessControlString(inode, path, access, mode)
);
}
private static FsImageProto.INodeSection.AclFeatureProto.Builder BuildAclEntries(
AclFeature f, FSImageFormatProtobuf.SaverContext.DeduplicationMap <string> map)
{
FsImageProto.INodeSection.AclFeatureProto.Builder b = FsImageProto.INodeSection.AclFeatureProto
.NewBuilder();
for (int pos = 0; pos < f.GetEntriesSize(); pos++)
{
e = f.GetEntryAt(pos);
int nameId = map.GetId(AclEntryStatusFormat.GetName(e));
int v = ((nameId & AclEntryNameMask) << AclEntryNameOffset) | ((int)(AclEntryStatusFormat
.GetType(e)) << AclEntryTypeOffset) | ((int)(AclEntryStatusFormat.GetScope(e)) <<
AclEntryScopeOffset) | ((int)(AclEntryStatusFormat.GetPermission(e)));
b.AddEntries(v);
}
return(b);
}
/// <summary>Checks requested access against an Access Control List.</summary>
/// <remarks>
/// Checks requested access against an Access Control List. This method relies
/// on finding the ACL data in the relevant portions of
/// <see cref="Org.Apache.Hadoop.FS.Permission.FsPermission"/>
/// and
/// <see cref="AclFeature"/>
/// as implemented in the logic of
/// <see cref="AclStorage"/>
/// . This
/// method also relies on receiving the ACL entries in sorted order. This is
/// assumed to be true, because the ACL modification methods in
/// <see cref="AclTransformation"/>
/// sort the resulting entries.
/// More specifically, this method depends on these invariants in an ACL:
/// - The list must be sorted.
/// - Each entry in the list must be unique by scope + type + name.
/// - There is exactly one each of the unnamed user/group/other entries.
/// - The mask entry must not have a name.
/// - The other entry must not have a name.
/// - Default entries may be present, but they are ignored during enforcement.
/// </remarks>
/// <param name="inode">INodeAttributes accessed inode</param>
/// <param name="snapshotId">int snapshot ID</param>
/// <param name="access">FsAction requested permission</param>
/// <param name="mode">FsPermission mode from inode</param>
/// <param name="aclFeature">AclFeature of inode</param>
/// <exception cref="Org.Apache.Hadoop.Security.AccessControlException">if the ACL denies permission
/// </exception>
private void CheckAccessAcl(INodeAttributes inode, string path, FsAction access,
FsPermission mode, AclFeature aclFeature)
{
bool foundMatch = false;
// Use owner entry from permission bits if user is owner.
if (GetUser().Equals(inode.GetUserName()))
{
if (mode.GetUserAction().Implies(access))
{
return;
}
foundMatch = true;
}
// Check named user and group entries if user was not denied by owner entry.
if (!foundMatch)
{
for (int pos = 0; pos < aclFeature.GetEntriesSize(); pos++)
{
entry = aclFeature.GetEntryAt(pos);
if (AclEntryStatusFormat.GetScope(entry) == AclEntryScope.Default)
{
break;
}
AclEntryType type = AclEntryStatusFormat.GetType(entry);
string name = AclEntryStatusFormat.GetName(entry);
if (type == AclEntryType.User)
{
// Use named user entry with mask from permission bits applied if user
// matches name.
if (GetUser().Equals(name))
{
FsAction masked = AclEntryStatusFormat.GetPermission(entry).And(mode.GetGroupAction
());
if (masked.Implies(access))
{
return;
}
foundMatch = true;
break;
}
}
else
{
if (type == AclEntryType.Group)
{
// Use group entry (unnamed or named) with mask from permission bits
// applied if user is a member and entry grants access. If user is a
// member of multiple groups that have entries that grant access, then
// it doesn't matter which is chosen, so exit early after first match.
string group = name == null?inode.GetGroupName() : name;
if (GetGroups().Contains(group))
{
FsAction masked = AclEntryStatusFormat.GetPermission(entry).And(mode.GetGroupAction
());
if (masked.Implies(access))
{
return;
}
foundMatch = true;
}
}
}
}
}
// Use other entry if user was not denied by an earlier match.
if (!foundMatch && mode.GetOtherAction().Implies(access))
{
return;
}
throw new AccessControlException(ToAccessControlString(inode, path, access, mode)
);
}