From patchwork Wed Mar 18 15:04:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 11445531 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A416A1874 for ; Wed, 18 Mar 2020 15:04:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 837C820776 for ; Wed, 18 Mar 2020 15:04:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="GpesNmLm" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727036AbgCRPE6 (ORCPT ); Wed, 18 Mar 2020 11:04:58 -0400 Received: from us-smtp-delivery-74.mimecast.com ([63.128.21.74]:42208 "EHLO us-smtp-delivery-74.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727279AbgCRPEz (ORCPT ); Wed, 18 Mar 2020 11:04:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1584543894; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GYqs55E1Ag/7cWCZRLCD3SOlOYIsSxXI9S5iSV593oI=; b=GpesNmLmqhRyb8zyTtMWsV+6jADGYj2sX5Clb6PPn3RCiIfhz1ggD88uDhql7PdoAiuDDs JETa+yKuOIdtGcxbQTZXhE1JxPaHaHEggeH51j+oTXmE/1r3y486/lN67N2GlaBgb+GgON 1brhMiwDTPjycSUgxmIr1VL16h8I8cY= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-8--qGXNCO2NCm-jRDcZi9q9A-1; Wed, 18 Mar 2020 11:04:51 -0400 X-MC-Unique: -qGXNCO2NCm-jRDcZi9q9A-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B3BA7107ACC7; Wed, 18 Mar 2020 15:04:49 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-113-126.rdu2.redhat.com [10.10.113.126]) by smtp.corp.redhat.com (Postfix) with ESMTP id 150B960BEC; Wed, 18 Mar 2020 15:04:46 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 10/17] selinux: Implement the watch_key security hook [ver #5] From: David Howells To: torvalds@linux-foundation.org, viro@zeniv.linux.org.uk Cc: Stephen Smalley , dhowells@redhat.com, casey@schaufler-ca.com, sds@tycho.nsa.gov, nicolas.dichtel@6wind.com, raven@themaw.net, christian@brauner.io, andres@anarazel.de, jlayton@redhat.com, dray@redhat.com, kzak@redhat.com, keyrings@vger.kernel.org, linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 18 Mar 2020 15:04:46 +0000 Message-ID: <158454388633.2863966.17799427202351674141.stgit@warthog.procyon.org.uk> In-Reply-To: <158454378820.2863966.10496767254293183123.stgit@warthog.procyon.org.uk> References: <158454378820.2863966.10496767254293183123.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.21 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: Implement the watch_key security hook to make sure that a key grants the caller View permission in order to set a watch on a key. For the moment, the watch_devices security hook is left unimplemented as it's not obvious what the object should be since the queue is global and didn't previously exist. Signed-off-by: David Howells Acked-by: Stephen Smalley Reviewed-by: James Morris --- security/selinux/hooks.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 1659b59fb5d7..2c19ac4d7894 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -6563,6 +6563,17 @@ static int selinux_key_getsecurity(struct key *key, char **_buffer) *_buffer = context; return rc; } + +#ifdef CONFIG_KEY_NOTIFICATIONS +static int selinux_watch_key(struct key *key) +{ + struct key_security_struct *ksec = key->security; + u32 sid = current_sid(); + + return avc_has_perm(&selinux_state, + sid, ksec->sid, SECCLASS_KEY, KEY_NEED_VIEW, NULL); +} +#endif #endif #ifdef CONFIG_SECURITY_INFINIBAND @@ -7078,6 +7089,9 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(key_free, selinux_key_free), LSM_HOOK_INIT(key_permission, selinux_key_permission), LSM_HOOK_INIT(key_getsecurity, selinux_key_getsecurity), +#ifdef CONFIG_KEY_NOTIFICATIONS + LSM_HOOK_INIT(watch_key, selinux_watch_key), +#endif #endif #ifdef CONFIG_AUDIT