Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D3F01C433FE for ; Tue, 30 Nov 2021 16:08:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229773AbhK3QLW (ORCPT ); Tue, 30 Nov 2021 11:11:22 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:26506 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243202AbhK3QK6 (ORCPT ); Tue, 30 Nov 2021 11:10:58 -0500 Received: from pps.filterd (m0098393.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 1AUFlVUC001271; Tue, 30 Nov 2021 16:07:16 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=ORsOqvHhu0hXyxnTJElDo6KuCG4EgLSfJ6yy5k2gfw0=; b=VgMVrDP7fCKiBOSPEoeJYN7t3DP//ACcp3lEfSgFlEIsO1vQWkm87557pT6ArP4TC9kj pUeEMcq4Q3iw3dk2ZLP4rJI74qm4xMpKHlvZbysdhxBDgqPzjs7jRdUQozzrkWKxZZ9S bAnkpJlOPpCl5RefK9nl/0LoiVlxxQwqvBYwTPDQ4SosepbNt55KYkq4v9B7D7bTU7X1 sqzntdNRXVylcuuTULopH9Br3vtIldELHVTnWJhHtCq8EBZeoADWfEyCqJ6SawRL9t5Y AV4R9J+W4So7o6/+hp4s43tVPoUnFY6mmVecqpCQ+JJueyXqxG5JlXXde6arUQMe6g+k iA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 3cnpwm0gve-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 30 Nov 2021 16:07:15 +0000 Received: from m0098393.ppops.net (m0098393.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 1AUFn00t005435; Tue, 30 Nov 2021 16:07:15 GMT Received: from ppma02dal.us.ibm.com (a.bd.3ea9.ip4.static.sl-reverse.com [169.62.189.10]) by mx0a-001b2d01.pphosted.com with ESMTP id 3cnpwm0gv0-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 30 Nov 2021 16:07:15 +0000 Received: from pps.filterd (ppma02dal.us.ibm.com [127.0.0.1]) by ppma02dal.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 1AUG4NsE023584; Tue, 30 Nov 2021 16:07:14 GMT Received: from b01cxnp22034.gho.pok.ibm.com (b01cxnp22034.gho.pok.ibm.com [9.57.198.24]) by ppma02dal.us.ibm.com with ESMTP id 3cn5ey2826-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 30 Nov 2021 16:07:14 +0000 Received: from b01ledav003.gho.pok.ibm.com (b01ledav003.gho.pok.ibm.com [9.57.199.108]) by b01cxnp22034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 1AUG7C2852166926 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 30 Nov 2021 16:07:12 GMT Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 356CEB209E; Tue, 30 Nov 2021 16:07:12 +0000 (GMT) Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 203B4B2074; Tue, 30 Nov 2021 16:07:12 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b01ledav003.gho.pok.ibm.com (Postfix) with ESMTP; Tue, 30 Nov 2021 16:07:12 +0000 (GMT) From: Stefan Berger To: linux-integrity@vger.kernel.org Cc: zohar@linux.ibm.com, serge@hallyn.com, christian.brauner@ubuntu.com, containers@lists.linux.dev, dmitry.kasatkin@gmail.com, ebiederm@xmission.com, krzysztof.struczynski@huawei.com, roberto.sassu@huawei.com, mpeters@redhat.com, lhinds@redhat.com, lsturman@redhat.com, puiterwi@redhat.com, jejb@linux.ibm.com, jamjoom@us.ibm.com, linux-kernel@vger.kernel.org, paul@paul-moore.com, rgb@redhat.com, linux-security-module@vger.kernel.org, jmorris@namei.org, Stefan Berger Subject: [RFC 10/20] ima: Implement hierarchical processing of file accesses Date: Tue, 30 Nov 2021 11:06:44 -0500 Message-Id: <20211130160654.1418231-11-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211130160654.1418231-1-stefanb@linux.ibm.com> References: <20211130160654.1418231-1-stefanb@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: olY2uukC-vW7BjoKv2512FBOJzNLKugZ X-Proofpoint-GUID: hI2lGVSoQuVVRbQEZhUSuTO6kUvtS6v4 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.0.607.475 definitions=2021-11-30_09,2021-11-28_01,2020-04-07_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 malwarescore=0 mlxlogscore=999 spamscore=0 priorityscore=1501 lowpriorityscore=0 suspectscore=0 impostorscore=0 adultscore=0 bulkscore=0 clxscore=1015 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2111300084 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Implement hierarchical processing of file accesses in IMA namespaces by walking the list of IMA namespaces towards the init_ima_ns. This way file accesses can be audited in an IMA namespace and also be evaluated against the IMA policies of parent IMA namespaces. Signed-off-by: Stefan Berger --- security/integrity/ima/ima_main.c | 29 +++++++++++++++++++++++++---- 1 file changed, 25 insertions(+), 4 deletions(-) diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index d692c9d53a98..42cbcaf2dc1e 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -199,10 +199,10 @@ void ima_file_free(struct file *file) ima_check_last_writer(iint, inode, file); } -static int process_measurement(struct ima_namespace *ns, - struct file *file, const struct cred *cred, - u32 secid, char *buf, loff_t size, int mask, - enum ima_hooks func) +static int _process_measurement(struct ima_namespace *ns, + struct file *file, const struct cred *cred, + u32 secid, char *buf, loff_t size, int mask, + enum ima_hooks func) { struct inode *inode = file_inode(file); struct integrity_iint_cache *iint = NULL; @@ -404,6 +404,27 @@ static int process_measurement(struct ima_namespace *ns, return 0; } +static int process_measurement(struct ima_namespace *ns, + struct file *file, const struct cred *cred, + u32 secid, char *buf, loff_t size, int mask, + enum ima_hooks func) +{ + int ret = 0; + struct user_namespace *user_ns; + + do { + ret = _process_measurement(ns, file, cred, secid, buf, size, mask, func); + if (ret) + break; + user_ns = ns->user_ns->parent; + if (!user_ns) + break; + ns = user_ns->ima_ns; + } while (1); + + return ret; +} + /** * ima_file_mmap - based on policy, collect/store measurement. * @file: pointer to the file to be measured (May be NULL) -- 2.31.1