From patchwork Tue Apr 30 15:06:31 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 10923795 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 EA99B92A for ; Tue, 30 Apr 2019 15:06:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DB4FE285E8 for ; Tue, 30 Apr 2019 15:06:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CED64287FA; Tue, 30 Apr 2019 15:06:54 +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=unavailable 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 67EDD285E8 for ; Tue, 30 Apr 2019 15:06:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726280AbfD3PGj (ORCPT ); Tue, 30 Apr 2019 11:06:39 -0400 Received: from mx1.redhat.com ([209.132.183.28]:43850 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726101AbfD3PGi (ORCPT ); Tue, 30 Apr 2019 11:06:38 -0400 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 550DE83F3B; Tue, 30 Apr 2019 15:06:38 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-120-61.rdu2.redhat.com [10.10.120.61]) by smtp.corp.redhat.com (Postfix) with ESMTP id F006B600C2; Tue, 30 Apr 2019 15:06:32 +0000 (UTC) Subject: [PATCH 00/11] keys: Namespacing [ver #2] From: David Howells To: ebiederm@xmission.com Cc: linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, linux-afs@lists.infradead.org, Jann Horn , keyrings@vger.kernel.org, dhowells@redhat.com, linux-security-module@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, dwalsh@redhat.com, vgoyal@redhat.com Date: Tue, 30 Apr 2019 16:06:31 +0100 Message-ID: <155663679069.31331.3777091898004242996.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 [10.5.110.27]); Tue, 30 Apr 2019 15:06:38 +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 patches to make keys and keyrings more namespace aware. Note that the branch is dependent on security/next-general. Firstly some miscellaneous patches to make the process easier: (1) Invalidate rather than revoke request_key() authentication keys to recycle them more quickly. (2) Remove request_key_async*() as they aren't used and would have to be namespaced. (3) 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. (4) 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). (5) Allow keying_search() to search non-recursively. Then the main patches: (6) Make it so that keyring names are per-user_namespace from the point of view of KEYCTL_JOIN_SESSION_KEYRING so that they're not accessible cross-user_namespace. (7) Move the user and user-session keyrings to the user_namespace rather than the user_struct. This prevents them propagating directly across user_namespaces boundaries (ie. the KEY_SPEC_* flags will only pick from the current user_namespace). (8) 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. (9) Make it so that keys are implicitly invalidated by removal of a domain tag, causing them to be garbage collected. (10) 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. (11) 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. Changes: V2 fixes: - Missing initialisation of net key_domain usage count. - Missing barriering on the keyring register pointer. - Use snprintf() rather than sprintf(). - Incorrect error handling in search_my_process_keyrings(). - Incorrect error handling in call_sbin_request_key(). 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 (11): 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: Add a 'recurse' flag for keyring searches keys: Namespace keyring names keys: Move the user and user-session keyrings to the user_namespace 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 Documentation/security/keys/core.rst | 10 + certs/blacklist.c | 2 crypto/asymmetric_keys/asymmetric_type.c | 2 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 | 50 ++++-- include/linux/sched/user.h | 14 -- include/linux/user_namespace.h | 12 + include/net/net_namespace.h | 4 kernel/user.c | 10 - kernel/user_namespace.c | 9 - lib/digsig.c | 2 net/ceph/messenger.c | 3 net/core/net_namespace.c | 19 ++ net/dns_resolver/dns_key.c | 1 net/dns_resolver/dns_query.c | 6 - net/rxrpc/key.c | 6 - net/rxrpc/security.c | 2 security/integrity/digsig_asymmetric.c | 4 security/keys/gc.c | 2 security/keys/internal.h | 10 + security/keys/key.c | 9 + security/keys/keyctl.c | 4 security/keys/keyring.c | 263 +++++++++++++++++------------- security/keys/persistent.c | 10 + security/keys/proc.c | 3 security/keys/process_keys.c | 252 ++++++++++++++++++----------- security/keys/request_key.c | 113 +++++++------ security/keys/request_key_auth.c | 3 33 files changed, 508 insertions(+), 339 deletions(-)