[v4,7/9] selinux: Implement Infiniband PKey "Access" access vector

Message ID	1478639185-47521-8-git-send-email-danielj@mellanox.com (mailing list archive)
State	Superseded
Headers	show Return-Path: <linux-rdma-owner@kernel.org> From: Dan Jurgens <danielj@mellanox.com> 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, liranl@mellanox.com, leonro@mellanox.com, Daniel Jurgens <danielj@mellanox.com> Subject: [PATCH v4 7/9] selinux: Implement Infiniband PKey "Access" access vector Date: Tue, 8 Nov 2016 23:06:23 +0200 Message-Id: <1478639185-47521-8-git-send-email-danielj@mellanox.com> In-Reply-To: <1478639185-47521-1-git-send-email-danielj@mellanox.com> References: <1478639185-47521-1-git-send-email-danielj@mellanox.com> Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk

diff --git a/include/linux/lsm_audit.h b/include/linux/lsm_audit.h index e58e577..402b770 100644 --- a/include/linux/lsm_audit.h +++ b/include/linux/lsm_audit.h @@ -45,6 +45,11 @@ struct lsm_ioctlop_audit { u16 cmd; }; +struct lsm_pkey_audit { + u64 subnet_prefix; + u16 pkey; +}; + /* Auxiliary data to use in generating the audit record. */ struct common_audit_data { char type; @@ -60,6 +65,7 @@ struct common_audit_data { #define LSM_AUDIT_DATA_DENTRY 10 #define LSM_AUDIT_DATA_IOCTL_OP 11 #define LSM_AUDIT_DATA_FILE 12 +#define LSM_AUDIT_DATA_PKEY 13 union { struct path path; struct dentry *dentry; @@ -77,6 +83,7 @@ struct common_audit_data { char *kmod_name; struct lsm_ioctlop_audit *op; struct file *file; + struct lsm_pkey_audit *pkey; } u; /* this union contains LSM specific data */ union { diff --git a/security/lsm_audit.c b/security/lsm_audit.c index 37f04da..b18d277 100644 --- a/security/lsm_audit.c +++ b/security/lsm_audit.c @@ -410,6 +410,19 @@ static void dump_common_audit_data(struct audit_buffer *ab, audit_log_format(ab, " kmod="); audit_log_untrustedstring(ab, a->u.kmod_name); break; + case LSM_AUDIT_DATA_PKEY: { + struct in6_addr sbn_pfx; + + memset(&sbn_pfx.s6_addr, 0, + sizeof(sbn_pfx.s6_addr)); + + memcpy(&sbn_pfx.s6_addr, &a->u.pkey->subnet_prefix, + sizeof(a->u.pkey->subnet_prefix)); + + audit_log_format(ab, " pkey=0x%x subnet_prefix=%pI6c", + a->u.pkey->pkey, &sbn_pfx); + break; + } } /* switch (a->type) */ } diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index f48759d..20fb292 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -6086,6 +6086,28 @@ static int selinux_key_getsecurity(struct key *key, char **_buffer) #endif #ifdef CONFIG_SECURITY_INFINIBAND +static int selinux_ib_pkey_access(void *ib_sec, u64 subnet_prefix, u16 pkey_val) +{ + struct common_audit_data ad; + int err; + u32 sid = 0; + struct ib_security_struct *sec = ib_sec; + struct lsm_pkey_audit pkey; + + err = security_pkey_sid(subnet_prefix, pkey_val, &sid); + + if (err) + return err; + + ad.type = LSM_AUDIT_DATA_PKEY; + pkey.subnet_prefix = subnet_prefix; + pkey.pkey = pkey_val; + ad.u.pkey = &pkey; + return avc_has_perm(sec->sid, sid, + SECCLASS_INFINIBAND_PKEY, + INFINIBAND_PKEY__ACCESS, &ad); +} + static int selinux_ib_alloc_security(void **ib_sec) { struct ib_security_struct *sec; @@ -6290,6 +6312,7 @@ static void selinux_ib_free_security(void *ib_sec) LSM_HOOK_INIT(tun_dev_attach, selinux_tun_dev_attach), 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_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 1f1f4b2..d42dd4d 100644 --- a/security/selinux/include/classmap.h +++ b/security/selinux/include/classmap.h @@ -165,5 +165,7 @@ struct security_class_mapping secclass_map[] = { { COMMON_CAP_PERMS, NULL } }, { "cap2_userns", { COMMON_CAP2_PERMS, NULL } }, + { "infiniband_pkey", + { "access", NULL } }, { NULL } }; diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h index 6bb9b0a..17afb7c 100644 --- a/security/selinux/include/security.h +++ b/security/selinux/include/security.h @@ -176,6 +176,8 @@ int security_get_user_sids(u32 callsid, char *username, 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_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 082b20c..085c54b 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -2203,6 +2203,47 @@ int security_port_sid(u8 protocol, u16 port, u32 *out_sid) } /** + * security_pkey_sid - Obtain the SID for a pkey. + * @subnet_prefix: Subnet Prefix + * @pkey_num: pkey number + * @out_sid: security identifier + */ +int security_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid) +{ + struct ocontext *c; + int rc = 0; + + read_lock(&policy_rwlock); + + c = policydb.ocontexts[OCON_PKEY]; + while (c) { + if (c->u.pkey.low_pkey <= pkey_num && + c->u.pkey.high_pkey >= pkey_num && + c->u.pkey.subnet_prefix == subnet_prefix) + 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

[v4,7/9] selinux: Implement Infiniband PKey "Access" access vector

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