From patchwork Wed Nov 23 14:17:25 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Jurgens X-Patchwork-Id: 9443417 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 56BB260779 for ; Wed, 23 Nov 2016 14:18:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 449D4267EC for ; Wed, 23 Nov 2016 14:18:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3970C2679B; Wed, 23 Nov 2016 14:18:28 +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, UNPARSEABLE_RELAY 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 AE7FD2675C for ; Wed, 23 Nov 2016 14:18:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S938717AbcKWOS0 (ORCPT ); Wed, 23 Nov 2016 09:18:26 -0500 Received: from mail-il-dmz.mellanox.com ([193.47.165.129]:34474 "EHLO mellanox.co.il" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S935393AbcKWOSZ (ORCPT ); Wed, 23 Nov 2016 09:18:25 -0500 Received: from Internal Mail-Server by MTLPINE1 (envelope-from danielj@mellanox.com) with ESMTPS (AES256-SHA encrypted); 23 Nov 2016 16:18:19 +0200 Received: from x-vnc01.mtx.labs.mlnx. (x-vnc01.mtx.labs.mlnx [10.12.150.16]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id uANEHdrN021742; Wed, 23 Nov 2016 16:18:11 +0200 From: Dan Jurgens To: chrisw@sous-sol.org, paul@paul-moore.com, sds@tycho.nsa.gov, eparis@parisplace.org, dledford@redhat.com, sean.hefty@intel.com, hal.rosenstock@gmail.com Cc: selinux@tycho.nsa.gov, linux-security-module@vger.kernel.org, linux-rdma@vger.kernel.org, yevgenyp@mellanox.com, Daniel Jurgens Subject: [PATCH v6 3/9] selinux lsm IB/core: Implement LSM notification system Date: Wed, 23 Nov 2016 16:17:25 +0200 Message-Id: <1479910651-43246-4-git-send-email-danielj@mellanox.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1479910651-43246-1-git-send-email-danielj@mellanox.com> References: <1479910651-43246-1-git-send-email-danielj@mellanox.com> Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Daniel Jurgens Add a generic notificaiton mechanism in the LSM. Interested consumers can register a callback with the LSM and security modules can produce events. Because access to Infiniband QPs are enforced in the setup phase of a connection security should be enforced again if the policy changes. Register infiniband devices for policy change notification and check all QPs on that device when the notification is received. Add a call to the notification mechanism from SELinux when the AVC cache changes or setenforce is cleared. Signed-off-by: Daniel Jurgens --- v2: - new patch that has the generic notification, replaces selinux and IB/core patches related to the ib_flush callback. Yuval Shaia and Paul Moore v3: - use notifier chains. Paul Moore v4: - Seperate avc callback for LSM notifier. Paul Moore v5: - Fix link error when CONFIG_SECURITY is not set. Build Robot --- drivers/infiniband/core/device.c | 53 ++++++++++++++++++++++++++++++++++++++++ include/linux/security.h | 23 +++++++++++++++++ security/security.c | 20 +++++++++++++++ security/selinux/hooks.c | 11 +++++++++ security/selinux/selinuxfs.c | 2 ++ 5 files changed, 109 insertions(+) diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c index 5b42e83..7b6fd06 100644 --- a/drivers/infiniband/core/device.c +++ b/drivers/infiniband/core/device.c @@ -39,6 +39,8 @@ #include #include #include +#include +#include #include #include #include @@ -82,6 +84,14 @@ static LIST_HEAD(client_list); static DEFINE_MUTEX(device_mutex); static DECLARE_RWSEM(lists_rwsem); +static int ib_security_change(struct notifier_block *nb, unsigned long event, + void *lsm_data); +static void ib_policy_change_task(struct work_struct *work); +static DECLARE_WORK(ib_policy_change_work, ib_policy_change_task); + +static struct notifier_block ibdev_lsm_nb = { + .notifier_call = ib_security_change, +}; static int ib_device_check_mandatory(struct ib_device *device) { @@ -344,6 +354,40 @@ static int setup_port_pkey_list(struct ib_device *device) return 0; } +static void ib_policy_change_task(struct work_struct *work) +{ + struct ib_device *dev; + + down_read(&lists_rwsem); + list_for_each_entry(dev, &device_list, core_list) { + int i; + + for (i = rdma_start_port(dev); i <= rdma_end_port(dev); i++) { + u64 sp; + int ret = ib_get_cached_subnet_prefix(dev, + i, + &sp); + + WARN_ONCE(ret, + "ib_get_cached_subnet_prefix err: %d, this should never happen here\n", + ret); + ib_security_cache_change(dev, i, sp); + } + } + up_read(&lists_rwsem); +} + +static int ib_security_change(struct notifier_block *nb, unsigned long event, + void *lsm_data) +{ + if (event != LSM_POLICY_CHANGE) + return NOTIFY_DONE; + + schedule_work(&ib_policy_change_work); + + return NOTIFY_OK; +} + /** * ib_register_device - Register an IB device with IB core * @device:Device to register @@ -1075,10 +1119,18 @@ static int __init ib_core_init(void) goto err_sa; } + ret = register_lsm_notifier(&ibdev_lsm_nb); + if (ret) { + pr_warn("Couldn't register LSM notifier. ret %d\n", ret); + goto err_ibnl_clients; + } + ib_cache_setup(); return 0; +err_ibnl_clients: + ib_remove_ibnl_clients(); err_sa: ib_sa_cleanup(); err_mad: @@ -1098,6 +1150,7 @@ static int __init ib_core_init(void) static void __exit ib_core_cleanup(void) { + unregister_lsm_notifier(&ibdev_lsm_nb); ib_cache_cleanup(); ib_remove_ibnl_clients(); ib_sa_cleanup(); diff --git a/include/linux/security.h b/include/linux/security.h index 342ca4c..0a5de0c 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -69,6 +69,10 @@ struct audit_krule; struct user_namespace; struct timezone; +enum lsm_event { + LSM_POLICY_CHANGE, +}; + /* These functions are in security/commoncap.c */ extern int cap_capable(const struct cred *cred, struct user_namespace *ns, int cap, int audit); @@ -161,6 +165,10 @@ struct security_mnt_opts { int num_mnt_opts; }; +int call_lsm_notifier(enum lsm_event event, void *data); +int register_lsm_notifier(struct notifier_block *nb); +int unregister_lsm_notifier(struct notifier_block *nb); + static inline void security_init_mnt_opts(struct security_mnt_opts *opts) { opts->mnt_opts = NULL; @@ -377,6 +385,21 @@ int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen); struct security_mnt_opts { }; +static inline int call_lsm_notifier(enum lsm_event event, void *data) +{ + return 0; +} + +static inline int register_lsm_notifier(struct notifier_block *nb) +{ + return 0; +} + +static inline int unregister_lsm_notifier(struct notifier_block *nb) +{ + return 0; +} + static inline void security_init_mnt_opts(struct security_mnt_opts *opts) { } diff --git a/security/security.c b/security/security.c index 7d3bf2f..40326d4 100644 --- a/security/security.c +++ b/security/security.c @@ -33,6 +33,8 @@ /* Maximum number of letters for an LSM name string */ #define SECURITY_NAME_MAX 10 +static ATOMIC_NOTIFIER_HEAD(lsm_notifier_chain); + /* Boot-time LSM user choice */ static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] = CONFIG_DEFAULT_SECURITY; @@ -98,6 +100,24 @@ int __init security_module_enable(const char *module) return !strcmp(module, chosen_lsm); } +int call_lsm_notifier(enum lsm_event event, void *data) +{ + return atomic_notifier_call_chain(&lsm_notifier_chain, event, data); +} +EXPORT_SYMBOL(call_lsm_notifier); + +int register_lsm_notifier(struct notifier_block *nb) +{ + return atomic_notifier_chain_register(&lsm_notifier_chain, nb); +} +EXPORT_SYMBOL(register_lsm_notifier); + +int unregister_lsm_notifier(struct notifier_block *nb) +{ + return atomic_notifier_chain_unregister(&lsm_notifier_chain, nb); +} +EXPORT_SYMBOL(unregister_lsm_notifier); + /* * Hook list operation macros. * diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 09fd610..2d7a7c1 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -170,6 +170,14 @@ static int selinux_netcache_avc_callback(u32 event) return 0; } +static int selinux_lsm_notifier_avc_callback(u32 event) +{ + if (event == AVC_CALLBACK_RESET) + call_lsm_notifier(LSM_POLICY_CHANGE, NULL); + + return 0; +} + /* * initialise the security for the init task */ @@ -6325,6 +6333,9 @@ static __init int selinux_init(void) if (avc_add_callback(selinux_netcache_avc_callback, AVC_CALLBACK_RESET)) panic("SELinux: Unable to register AVC netcache callback\n"); + if (avc_add_callback(selinux_lsm_notifier_avc_callback, AVC_CALLBACK_RESET)) + panic("SELinux: Unable to register AVC LSM notifier callback\n"); + if (selinux_enforcing) printk(KERN_DEBUG "SELinux: Starting in enforcing mode\n"); else diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c index 72c145d..d3f9192 100644 --- a/security/selinux/selinuxfs.c +++ b/security/selinux/selinuxfs.c @@ -177,6 +177,8 @@ static ssize_t sel_write_enforce(struct file *file, const char __user *buf, avc_ss_reset(0); selnl_notify_setenforce(selinux_enforcing); selinux_status_update_setenforce(selinux_enforcing); + if (!selinux_enforcing) + call_lsm_notifier(LSM_POLICY_CHANGE, NULL); } length = count; out: