From patchwork Tue Nov 22 19:40:37 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Jurgens X-Patchwork-Id: 9442007 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 5E2796075D for ; Tue, 22 Nov 2016 19:41:36 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4B0311FF0B for ; Tue, 22 Nov 2016 19:41:36 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3D1FB1FF12; Tue, 22 Nov 2016 19:41:36 +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 BE1381FF12 for ; Tue, 22 Nov 2016 19:41:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933861AbcKVTlb (ORCPT ); Tue, 22 Nov 2016 14:41:31 -0500 Received: from mail-il-dmz.mellanox.com ([193.47.165.129]:36428 "EHLO mellanox.co.il" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S933884AbcKVTlT (ORCPT ); Tue, 22 Nov 2016 14:41:19 -0500 Received: from Internal Mail-Server by MTLPINE1 (envelope-from danielj@mellanox.com) with ESMTPS (AES256-SHA encrypted); 22 Nov 2016 21:41:17 +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 uAMJenMc005134; Tue, 22 Nov 2016 21:41:14 +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 v5 8/9] selinux: Add IB Port SMP access vector Date: Tue, 22 Nov 2016 21:40:37 +0200 Message-Id: <1479843638-67136-9-git-send-email-danielj@mellanox.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1479843638-67136-1-git-send-email-danielj@mellanox.com> References: <1479843638-67136-1-git-send-email-danielj@mellanox.com> Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP From: Daniel Jurgens Add a type for Infiniband ports and an access vector for subnet management packets. Implement the ib_port_smp hook to check that the caller has permission to send and receive SMPs on the end port specified by the device name and port. Add interface to query the SID for a IB port, which walks the IB_PORT ocontexts to find an entry for the given name and port. Signed-off-by: Daniel Jurgens --- v2: - Shorted ib_end_port. Paul Moore - Pass void blobs to security hooks. Paul Moore - Log specific IB port info in audit log. Paul Moore - Don't create a new intial sid, use unlabeled. Stephen Smalley - Changed "smp" to "manage_subnet". Paul Moore v3: - ib_port -> ib_endport. Paul Moore - Don't log device name as untrusted string. Paul Moore - Reorder parameters of LSM hook. Paul Moore --- include/linux/lsm_audit.h | 8 +++++++ security/lsm_audit.c | 5 +++++ security/selinux/hooks.c | 25 ++++++++++++++++++++++ security/selinux/include/classmap.h | 2 ++ security/selinux/include/security.h | 2 ++ security/selinux/ss/services.c | 42 +++++++++++++++++++++++++++++++++++++ 6 files changed, 84 insertions(+) diff --git a/include/linux/lsm_audit.h b/include/linux/lsm_audit.h index 402b770..7047b4c 100644 --- a/include/linux/lsm_audit.h +++ b/include/linux/lsm_audit.h @@ -21,6 +21,7 @@ #include #include #include +#include struct lsm_network_audit { int netif; @@ -50,6 +51,11 @@ struct lsm_pkey_audit { u16 pkey; }; +struct lsm_ib_endport_audit { + char dev_name[IB_DEVICE_NAME_MAX]; + u8 port_num; +}; + /* Auxiliary data to use in generating the audit record. */ struct common_audit_data { char type; @@ -66,6 +72,7 @@ struct common_audit_data { #define LSM_AUDIT_DATA_IOCTL_OP 11 #define LSM_AUDIT_DATA_FILE 12 #define LSM_AUDIT_DATA_PKEY 13 +#define LSM_AUDIT_DATA_IB_ENDPORT 14 union { struct path path; struct dentry *dentry; @@ -84,6 +91,7 @@ struct common_audit_data { struct lsm_ioctlop_audit *op; struct file *file; struct lsm_pkey_audit *pkey; + struct lsm_ib_endport_audit *ib_endport; } u; /* this union contains LSM specific data */ union { diff --git a/security/lsm_audit.c b/security/lsm_audit.c index b18d277..549fe9d 100644 --- a/security/lsm_audit.c +++ b/security/lsm_audit.c @@ -423,6 +423,11 @@ static void dump_common_audit_data(struct audit_buffer *ab, a->u.pkey->pkey, &sbn_pfx); break; } + case LSM_AUDIT_DATA_IB_ENDPORT: + audit_log_format(ab, " device=%s port_num=%u", + a->u.ib_endport->dev_name, + a->u.ib_endport->port_num); + break; } /* switch (a->type) */ } diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index e21f7690..0954dfe 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -6108,6 +6108,29 @@ static int selinux_ib_pkey_access(void *ib_sec, u64 subnet_prefix, u16 pkey_val) INFINIBAND_PKEY__ACCESS, &ad); } +static int selinux_ib_endport_manage_subnet(void *ib_sec, const char *dev_name, + u8 port_num) +{ + struct common_audit_data ad; + int err; + u32 sid = 0; + struct ib_security_struct *sec = ib_sec; + struct lsm_ib_endport_audit ib_endport; + + err = security_ib_endport_sid(dev_name, port_num, &sid); + + if (err) + return err; + + ad.type = LSM_AUDIT_DATA_IB_ENDPORT; + strncpy(ib_endport.dev_name, dev_name, sizeof(ib_endport.dev_name)); + ib_endport.port_num = port_num; + ad.u.ib_endport = &ib_endport; + return avc_has_perm(sec->sid, sid, + SECCLASS_INFINIBAND_ENDPORT, + INFINIBAND_ENDPORT__MANAGE_SUBNET, &ad); +} + static int selinux_ib_alloc_security(void **ib_sec) { struct ib_security_struct *sec; @@ -6313,6 +6336,8 @@ static struct security_hook_list selinux_hooks[] = { LSM_HOOK_INIT(tun_dev_open, selinux_tun_dev_open), #ifdef CONFIG_SECURITY_INFINIBAND LSM_HOOK_INIT(ib_pkey_access, selinux_ib_pkey_access), + LSM_HOOK_INIT(ib_endport_manage_subnet, + selinux_ib_endport_manage_subnet), LSM_HOOK_INIT(ib_alloc_security, selinux_ib_alloc_security), LSM_HOOK_INIT(ib_free_security, selinux_ib_free_security), #endif diff --git a/security/selinux/include/classmap.h b/security/selinux/include/classmap.h index d42dd4d..f93b64b 100644 --- a/security/selinux/include/classmap.h +++ b/security/selinux/include/classmap.h @@ -167,5 +167,7 @@ struct security_class_mapping secclass_map[] = { { COMMON_CAP2_PERMS, NULL } }, { "infiniband_pkey", { "access", NULL } }, + { "infiniband_endport", + { "manage_subnet", NULL } }, { NULL } }; diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h index 17afb7c..8a6e5e7 100644 --- a/security/selinux/include/security.h +++ b/security/selinux/include/security.h @@ -178,6 +178,8 @@ int security_port_sid(u8 protocol, u16 port, u32 *out_sid); int security_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid); +int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid); + int security_netif_sid(char *name, u32 *if_sid); int security_node_sid(u16 domain, void *addr, u32 addrlen, diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index 085c54b..db40ce7 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -2244,6 +2244,48 @@ int security_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid) } /** + * security_ib_endport_sid - Obtain the SID for a subnet management interface. + * @dev_name: device name + * @port: port number + * @out_sid: security identifier + */ +int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid) +{ + struct ocontext *c; + int rc = 0; + + read_lock(&policy_rwlock); + + c = policydb.ocontexts[OCON_IB_ENDPORT]; + while (c) { + if (c->u.ib_endport.port_num == port_num && + !strncmp(c->u.ib_endport.dev_name, + dev_name, + IB_DEVICE_NAME_MAX)) + break; + + c = c->next; + } + + if (c) { + if (!c->sid[0]) { + rc = sidtab_context_to_sid(&sidtab, + &c->context[0], + &c->sid[0]); + if (rc) + goto out; + } + *out_sid = c->sid[0]; + } else { + *out_sid = SECINITSID_UNLABELED; + } + +out: + read_unlock(&policy_rwlock); + return rc; +} + +/** * security_netif_sid - Obtain the SID for a network interface. * @name: interface name * @if_sid: interface SID