From patchwork Thu Feb 14 16:56:38 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 10813211 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EC9756C2 for ; Thu, 14 Feb 2019 16:56:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D71C42EC3A for ; Thu, 14 Feb 2019 16:56:44 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C80322EC3F; Thu, 14 Feb 2019 16:56:44 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5DDBB2EC3A for ; Thu, 14 Feb 2019 16:56:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2395356AbfBNQ4n (ORCPT ); Thu, 14 Feb 2019 11:56:43 -0500 Received: from mx1.redhat.com ([209.132.183.28]:9047 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728698AbfBNQ4n (ORCPT ); Thu, 14 Feb 2019 11:56:43 -0500 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 46BF23C2CD0; Thu, 14 Feb 2019 16:56:43 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-121-129.rdu2.redhat.com [10.10.121.129]) by smtp.corp.redhat.com (Postfix) with ESMTP id A958E600C1; Thu, 14 Feb 2019 16:56:39 +0000 (UTC) Subject: [RFC PATCH 0/9] keys: Namespacing From: David Howells To: keyrings@vger.kernel.org Cc: linux-security-module@vger.kernel.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, linux-fsdevel@vger.kernel.org, rgb@redhat.com, dhowells@redhat.com, linux-kernel@vger.kernel.org Date: Thu, 14 Feb 2019 16:56:38 +0000 Message-ID: <155016339876.11489.901851271827069026.stgit@warthog.procyon.org.uk> User-Agent: StGit/unknown-version MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Thu, 14 Feb 2019 16:56:43 +0000 (UTC) Sender: linux-cifs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Here are some development patches to make keys and keyrings namespace aware by the following means: (1) Firstly some miscellaneous patches to make it simpler: (a) Invalidate rather than revoke request_key() authentication keys to recycle them more quickly. (b) Remove request_key_async*() as they aren't used and would have to be namespaced. (c) Simplify key index_key handling so that the word-sized chunks assoc_array requires don't have to be shifted about, making it easier to add more bits into the key. (d) Cache the hash value so that we don't have to calculate on every key we examine during a search (it involves a bunch of multiplications). [Note: Some of these want to be split out and sent separately] (2) Make it possible to include the target namespace in which the key shall operate in the index_key. This will allow the possibility of multiple keys with the same description, but different target domains to be held in the same keyring. (3) Make it so that keys are effectively invalidated by removal of a domain tag, causing them to be garbage collected. (4) Institute a network namespace domain tag that allows keys to be differentiated by the network namespace in which they operate. New keys that are of a type marked 'KEY_TYPE_NET_DOMAIN' are assigned the network domain in force when they are created. (5) Make it so that the desired network namespace can be handed down into the request_key() mechanism. This allows AFS, NFS, etc. to request keys specific to the network namespace of the superblock. This also means that the keys in the DNS record cache are thenceforth namespaced, provided network filesystems pass the appropriate network namespace down into dns_query(). For DNS, AFS and NFS are good; CIFS and Ceph are not. Other cache keyrings, such as idmapper keyrings, also need to set the domain tag. (6) Make it so that keyring names are per-user-namespace so that they're not accessible cross-user-namespace. The patches can be found on the following branch: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h=keys-namespace David --- David Howells (9): keys: Invalidate used request_key authentication keys keys: Kill off request_key_async{,_with_auxdata} keys: Simplify key description management keys: Cache the hash value to avoid lots of recalculation keys: Include target namespace in match criteria keys: Garbage collect keys for which the domain has been removed keys: Network namespace domain tag keys: Pass the network namespace into request_key mechanism KEYS: Namespace keyring names fs/afs/addr_list.c | 4 - fs/afs/dynroot.c | 7 + fs/cifs/dns_resolve.c | 3 fs/nfs/dns_resolve.c | 2 include/linux/dns_resolver.h | 3 include/linux/key-type.h | 3 include/linux/key.h | 46 ++++++- include/linux/user_namespace.h | 5 + include/net/net_namespace.h | 4 + kernel/user.c | 3 kernel/user_namespace.c | 7 + net/ceph/messenger.c | 3 net/core/net_namespace.c | 18 +++ net/dns_resolver/dns_key.c | 1 net/dns_resolver/dns_query.c | 6 + net/rxrpc/key.c | 6 + security/keys/gc.c | 2 security/keys/internal.h | 6 + security/keys/key.c | 9 + security/keys/keyctl.c | 2 security/keys/keyring.c | 248 ++++++++++++++++++++++------------------ security/keys/persistent.c | 2 security/keys/request_key.c | 90 +++++++-------- 23 files changed, 288 insertions(+), 192 deletions(-)