From patchwork Tue Mar 27 13:57:18 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 10310137 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id C20DF60353 for ; Tue, 27 Mar 2018 13:58:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B159726AE3 for ; Tue, 27 Mar 2018 13:58:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A325329789; Tue, 27 Mar 2018 13:58:30 +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=-6.9 required=2.0 tests=BAYES_00,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 096EE26AE3 for ; Tue, 27 Mar 2018 13:58:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752275AbeC0N63 (ORCPT ); Tue, 27 Mar 2018 09:58:29 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:53418 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752816AbeC0N52 (ORCPT ); Tue, 27 Mar 2018 09:57:28 -0400 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w2RDtpSE080107 for ; Tue, 27 Mar 2018 09:57:27 -0400 Received: from e15.ny.us.ibm.com (e15.ny.us.ibm.com [129.33.205.205]) by mx0b-001b2d01.pphosted.com with ESMTP id 2gyp6fknj6-1 (version=TLSv1.2 cipher=AES256-SHA256 bits=256 verify=NOT) for ; Tue, 27 Mar 2018 09:57:27 -0400 Received: from localhost by e15.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Tue, 27 Mar 2018 09:57:23 -0400 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 w2RDvNHC51773608; Tue, 27 Mar 2018 13:57:23 GMT Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2F533B2050; Tue, 27 Mar 2018 10:59:33 -0400 (EDT) Received: from sbct-3.watson.ibm.com (unknown [9.47.158.153]) by b01ledav003.gho.pok.ibm.com (Postfix) with ESMTP id 15B07B204D; Tue, 27 Mar 2018 10:59:33 -0400 (EDT) From: Stefan Berger To: linux-integrity@vger.kernel.org Cc: containers@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, tycho@docker.com, serge@hallyn.com, sunyuqiong1988@gmail.com, david.safford@ge.com, mkayaalp@cs.binghamton.edu, James.Bottomley@HansenPartnership.com, zohar@linux.vnet.ibm.com, ebiederm@xmission.com, Mehmet Kayaalp Subject: [RFC PATCH v3 3/3] ima: mamespace audit status flags Date: Tue, 27 Mar 2018 09:57:18 -0400 X-Mailer: git-send-email 2.5.5 In-Reply-To: <1522159038-14175-1-git-send-email-stefanb@linux.vnet.ibm.com> References: <1522159038-14175-1-git-send-email-stefanb@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18032713-0036-0000-0000-000002D6C82D X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00008753; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000255; SDB=6.01009167; UDB=6.00514062; IPR=6.00788449; MB=3.00020268; MTD=3.00000008; XFM=3.00000015; UTC=2018-03-27 13:57:26 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18032713-0037-0000-0000-000043C73AD8 Message-Id: <1522159038-14175-4-git-send-email-stefanb@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2018-03-27_06:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1803270141 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP From: Mehmet Kayaalp The iint cache stores whether the file is measured, appraised, audited etc. This patch moves the IMA_AUDITED flag into the per-namespace ns_status, enabling IMA audit mechanism to audit the same file each time it is accessed in a new namespace. The ns_status is not looked up if the CONFIG_IMA_NS is disabled or if any of the IMA_NS_STATUS_ACTIONS (currently only IMA_AUDIT) is not enabled. Read and write operations on the iint flags is replaced with function calls. For reading, iint_flags() returns the bitwise AND of iint->flags and ns_status->flags. The ns_status flags are masked with IMA_NS_STATUS_FLAGS (currently only IMA_AUDITED). Similarly set_iint_flags() only writes the masked portion to the ns_status flags, while the iint flags is set as before. The ns_status parameter added to ima_audit_measurement() is used with the above functions to query and set the ns_status flags. Signed-off-by: Mehmet Kayaalp Changelog: v2: * fixed flag calculation in iint_flags() --- init/Kconfig | 4 +++- security/integrity/ima/ima.h | 24 +++++++++++++++++++++++- security/integrity/ima/ima_api.c | 8 +++++--- security/integrity/ima/ima_main.c | 15 ++++++++++++--- security/integrity/ima/ima_ns.c | 22 ++++++++++++++++++++++ 5 files changed, 65 insertions(+), 8 deletions(-) diff --git a/init/Kconfig b/init/Kconfig index a1ad5384e081..f792ae235424 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -938,7 +938,9 @@ config IMA_NS help Allow the creation of IMA namespaces for each mount namespace. Namespaced IMA data enables having IMA features work separately - for each mount namespace. + for each mount namespace. Currently, only the audit status flags + are stored in the namespace, which allows the same file to be + audited each time it is accessed in a new namespace. endif # NAMESPACES diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index e51a39ff75ff..86fd3c1c0caf 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -210,7 +210,8 @@ void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, struct evm_ima_xattr_data *xattr_value, int xattr_len, int pcr); void ima_audit_measurement(struct integrity_iint_cache *iint, - const unsigned char *filename); + const unsigned char *filename, + struct ns_status *status); int ima_alloc_init_template(struct ima_event_data *event_data, struct ima_template_entry **entry); int ima_store_template(struct ima_template_entry *entry, int violation, @@ -299,6 +300,9 @@ static inline int ima_read_xattr(struct dentry *dentry, #endif /* CONFIG_IMA_APPRAISE */ +#define IMA_NS_STATUS_ACTIONS IMA_AUDIT +#define IMA_NS_STATUS_FLAGS IMA_AUDITED + int ima_ns_init(void); struct ima_namespace; int ima_init_namespace(struct ima_namespace *ns); @@ -306,12 +310,30 @@ int ima_init_namespace(struct ima_namespace *ns); #ifdef CONFIG_IMA_NS struct ns_status *ima_get_ns_status(struct ima_namespace *ns, struct inode *inode); +unsigned long iint_flags(struct integrity_iint_cache *iint, + struct ns_status *status); +unsigned long set_iint_flags(struct integrity_iint_cache *iint, + struct ns_status *status, unsigned long flags); #else static inline struct ns_status *ima_get_ns_status(struct ima_namespace *ns, struct inode *inode) { return NULL; } + +static inline unsigned long iint_flags(struct integrity_iint_cache *iint, + struct ns_status *status) +{ + return iint->flags; +} + +static inline unsigned long set_iint_flags(struct integrity_iint_cache *iint, + struct ns_status *status, + unsigned long flags) +{ + iint->flags = flags; + return flags; +} #endif /* CONFIG_IMA_NS */ /* LSM based policy rules require audit */ diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c index c7e8db0ea4c0..ee55dfd6afdb 100644 --- a/security/integrity/ima/ima_api.c +++ b/security/integrity/ima/ima_api.c @@ -304,15 +304,17 @@ void ima_store_measurement(struct integrity_iint_cache *iint, } void ima_audit_measurement(struct integrity_iint_cache *iint, - const unsigned char *filename) + const unsigned char *filename, + struct ns_status *status) { struct audit_buffer *ab; char hash[(iint->ima_hash->length * 2) + 1]; const char *algo_name = hash_algo_name[iint->ima_hash->algo]; char algo_hash[sizeof(hash) + strlen(algo_name) + 2]; int i; + unsigned long flags = iint_flags(iint, status); - if (iint->flags & IMA_AUDITED) + if (flags & IMA_AUDITED) return; for (i = 0; i < iint->ima_hash->length; i++) @@ -333,7 +335,7 @@ void ima_audit_measurement(struct integrity_iint_cache *iint, audit_log_task_info(ab, current); audit_log_end(ab); - iint->flags |= IMA_AUDITED; + set_iint_flags(iint, status, flags | IMA_AUDITED); } /* diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 770654694efc..9328e57d3f09 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -164,6 +164,7 @@ static int process_measurement(struct file *file, char *buf, loff_t size, { struct inode *inode = file_inode(file); struct integrity_iint_cache *iint = NULL; + struct ns_status *status = NULL; struct ima_template_desc *template_desc; char *pathbuf = NULL; char filename[NAME_MAX]; @@ -174,6 +175,7 @@ static int process_measurement(struct file *file, char *buf, loff_t size, int xattr_len = 0; bool violation_check; enum hash_algo hash_algo; + unsigned long flags; if (!ima_policy_flag || !S_ISREG(inode->i_mode)) return 0; @@ -200,6 +202,12 @@ static int process_measurement(struct file *file, char *buf, loff_t size, iint = integrity_inode_get(inode); if (!iint) goto out; + + if (action & IMA_NS_STATUS_ACTIONS) { + status = ima_get_ns_status(get_current_ns(), inode); + if (IS_ERR(status)) + goto out; + } } if (violation_check) { @@ -215,9 +223,10 @@ static int process_measurement(struct file *file, char *buf, loff_t size, * (IMA_MEASURE, IMA_MEASURED, IMA_XXXX_APPRAISE, IMA_XXXX_APPRAISED, * IMA_AUDIT, IMA_AUDITED) */ - iint->flags |= action; + flags = iint_flags(iint, status); + flags = set_iint_flags(iint, status, flags | action); action &= IMA_DO_MASK; - action &= ~((iint->flags & (IMA_DONE_MASK ^ IMA_MEASURED)) >> 1); + action &= ~((flags & (IMA_DONE_MASK ^ IMA_MEASURED)) >> 1); /* If target pcr is already measured, unset IMA_MEASURE action */ if ((action & IMA_MEASURE) && (iint->measured_pcrs & (0x1 << pcr))) @@ -252,7 +261,7 @@ static int process_measurement(struct file *file, char *buf, loff_t size, rc = ima_appraise_measurement(func, iint, file, pathname, xattr_value, xattr_len, opened); if (action & IMA_AUDIT) - ima_audit_measurement(iint, pathname); + ima_audit_measurement(iint, pathname, status); if ((file->f_flags & O_DIRECT) && (iint->flags & IMA_PERMIT_DIRECTIO)) rc = 0; diff --git a/security/integrity/ima/ima_ns.c b/security/integrity/ima/ima_ns.c index ef70fd1e25c6..8e2e388ea808 100644 --- a/security/integrity/ima/ima_ns.c +++ b/security/integrity/ima/ima_ns.c @@ -201,3 +201,25 @@ struct ns_status *ima_get_ns_status(struct ima_namespace *ns, return status; } + +#define IMA_NS_STATUS_ACTIONS IMA_AUDIT +#define IMA_NS_STATUS_FLAGS IMA_AUDITED + +unsigned long iint_flags(struct integrity_iint_cache *iint, + struct ns_status *status) +{ + if (!status) + return iint->flags; + + return (iint->flags & ~IMA_NS_STATUS_FLAGS) | (status->flags & IMA_NS_STATUS_FLAGS); +} + +unsigned long set_iint_flags(struct integrity_iint_cache *iint, + struct ns_status *status, unsigned long flags) +{ + iint->flags = flags; + if (status) + status->flags = flags & IMA_NS_STATUS_FLAGS; + + return flags; +}