From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_MUTT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 12B16C43381 for ; Mon, 18 Mar 2019 20:56:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CA9CE2133D for ; Mon, 18 Mar 2019 20:56:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727611AbfCRU4t (ORCPT ); Mon, 18 Mar 2019 16:56:49 -0400 Received: from charlotte.tuxdriver.com ([70.61.120.58]:59720 "EHLO smtp.tuxdriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727422AbfCRU4t (ORCPT ); Mon, 18 Mar 2019 16:56:49 -0400 Received: from cpe-2606-a000-111b-405a-9816-2c85-c514-8f7a.dyn6.twc.com ([2606:a000:111b:405a:9816:2c85:c514:8f7a] helo=localhost) by smtp.tuxdriver.com with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.63) (envelope-from ) id 1h5zJG-0001KZ-M1; Mon, 18 Mar 2019 16:56:42 -0400 Date: Mon, 18 Mar 2019 16:56:11 -0400 From: Neil Horman To: Richard Guy Briggs Cc: containers@lists.linux-foundation.org, linux-api@vger.kernel.org, Linux-Audit Mailing List , linux-fsdevel@vger.kernel.org, LKML , netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, Paul Moore , sgrubb@redhat.com, omosnace@redhat.com, dhowells@redhat.com, simo@redhat.com, eparis@parisplace.org, serge@hallyn.com, ebiederm@xmission.com Subject: Re: [PATCH ghak90 V5 09/10] audit: add support for containerid to network namespaces Message-ID: <20190318205611.GF4111@hmswarspite.think-freely.org> References: <27473c84a274c64871cfa8e3636deaf05603c978.1552665316.git.rgb@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <27473c84a274c64871cfa8e3636deaf05603c978.1552665316.git.rgb@redhat.com> User-Agent: Mutt/1.11.3 (2019-02-01) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Fri, Mar 15, 2019 at 02:29:57PM -0400, Richard Guy Briggs wrote: > Audit events could happen in a network namespace outside of a task > context due to packets received from the net that trigger an auditing > rule prior to being associated with a running task. The network > namespace could be in use by multiple containers by association to the > tasks in that network namespace. We still want a way to attribute > these events to any potential containers. Keep a list per network > namespace to track these audit container identifiiers. > > Add/increment the audit container identifier on: > - initial setting of the audit container identifier via /proc > - clone/fork call that inherits an audit container identifier > - unshare call that inherits an audit container identifier > - setns call that inherits an audit container identifier > Delete/decrement the audit container identifier on: > - an inherited audit container identifier dropped when child set > - process exit > - unshare call that drops a net namespace > - setns call that drops a net namespace > > See: https://github.com/linux-audit/audit-kernel/issues/92 > See: https://github.com/linux-audit/audit-testsuite/issues/64 > See: https://github.com/linux-audit/audit-kernel/wiki/RFE-Audit-Container-ID > Signed-off-by: Richard Guy Briggs > --- > include/linux/audit.h | 19 ++++++++++++ > kernel/audit.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++++-- > kernel/nsproxy.c | 4 +++ > 3 files changed, 106 insertions(+), 3 deletions(-) > > diff --git a/include/linux/audit.h b/include/linux/audit.h > index fa19fa408931..70255c2dfb9f 100644 > --- a/include/linux/audit.h > +++ b/include/linux/audit.h > @@ -27,6 +27,7 @@ > #include > #include /* LOOKUP_* */ > #include > +#include > > #define AUDIT_INO_UNSET ((unsigned long)-1) > #define AUDIT_DEV_UNSET ((dev_t)-1) > @@ -99,6 +100,13 @@ struct audit_task_info { > > extern struct audit_task_info init_struct_audit; > > +struct audit_contid { > + struct list_head list; > + u64 id; > + refcount_t refcount; > + struct rcu_head rcu; > +}; > + > extern int is_audit_feature_set(int which); > > extern int __init audit_register_class(int class, unsigned *list); > @@ -202,6 +210,10 @@ static inline u64 audit_get_contid(struct task_struct *tsk) > } > > extern void audit_log_contid(struct audit_context *context, u64 contid); > +extern void audit_netns_contid_add(struct net *net, u64 contid); > +extern void audit_netns_contid_del(struct net *net, u64 contid); > +extern void audit_switch_task_namespaces(struct nsproxy *ns, > + struct task_struct *p); > > extern u32 audit_enabled; > #else /* CONFIG_AUDIT */ > @@ -271,6 +283,13 @@ static inline u64 audit_get_contid(struct task_struct *tsk) > > static inline void audit_log_contid(struct audit_context *context, u64 contid) > { } > +static inline void audit_netns_contid_add(struct net *net, u64 contid) > +{ } > +static inline void audit_netns_contid_del(struct net *net, u64 contid) > +{ } > +static inline void audit_switch_task_namespaces(struct nsproxy *ns, > + struct task_struct *p) > +{ } > > #define audit_enabled AUDIT_OFF > #endif /* CONFIG_AUDIT */ > diff --git a/kernel/audit.c b/kernel/audit.c > index cf448599ef34..7fa3194f5342 100644 > --- a/kernel/audit.c > +++ b/kernel/audit.c > @@ -72,6 +72,7 @@ > #include > #include > #include > +#include > > #include "audit.h" > > @@ -99,9 +100,13 @@ > /** > * struct audit_net - audit private network namespace data > * @sk: communication socket > + * @contid_list: audit container identifier list > + * @contid_list_lock audit container identifier list lock > */ > struct audit_net { > struct sock *sk; > + struct list_head contid_list; > + spinlock_t contid_list_lock; > }; > > /** > @@ -275,8 +280,11 @@ struct audit_task_info init_struct_audit = { > void audit_free(struct task_struct *tsk) > { > struct audit_task_info *info = tsk->audit; > + struct nsproxy *ns = tsk->nsproxy; > > audit_free_syscall(tsk); > + if (ns) > + audit_netns_contid_del(ns->net_ns, audit_get_contid(tsk)); > /* Freeing the audit_task_info struct must be performed after > * audit_log_exit() due to need for loginuid and sessionid. > */ > @@ -376,6 +384,73 @@ static struct sock *audit_get_sk(const struct net *net) > return aunet->sk; > } > > +void audit_netns_contid_add(struct net *net, u64 contid) > +{ > + struct audit_net *aunet = net_generic(net, audit_net_id); > + struct list_head *contid_list = &aunet->contid_list; > + struct audit_contid *cont; > + > + if (!audit_contid_valid(contid)) > + return; > + if (!aunet) > + return; > + spin_lock(&aunet->contid_list_lock); > + if (!list_empty(contid_list)) > + list_for_each_entry_rcu(cont, contid_list, list) > + if (cont->id == contid) { > + refcount_inc(&cont->refcount); > + goto out; > + } > + cont = kmalloc(sizeof(struct audit_contid), GFP_ATOMIC); > + if (cont) { > + INIT_LIST_HEAD(&cont->list); > + cont->id = contid; > + refcount_set(&cont->refcount, 1); > + list_add_rcu(&cont->list, contid_list); > + } > +out: > + spin_unlock(&aunet->contid_list_lock); > +} > + > +void audit_netns_contid_del(struct net *net, u64 contid) > +{ > + struct audit_net *aunet; > + struct list_head *contid_list; > + struct audit_contid *cont = NULL; > + > + if (!net) > + return; > + if (!audit_contid_valid(contid)) > + return; > + aunet = net_generic(net, audit_net_id); > + if (!aunet) > + return; > + contid_list = &aunet->contid_list; > + spin_lock(&aunet->contid_list_lock); > + if (!list_empty(contid_list)) > + list_for_each_entry_rcu(cont, contid_list, list) > + if (cont->id == contid) { > + if (refcount_dec_and_test(&cont->refcount)) { > + list_del_rcu(&cont->list); > + kfree_rcu(cont, rcu); > + } > + break; > + } > + spin_unlock(&aunet->contid_list_lock); > +} > + > +void audit_switch_task_namespaces(struct nsproxy *ns, struct task_struct *p) > +{ > + u64 contid = audit_get_contid(p); > + struct nsproxy *new = p->nsproxy; > + > + if (!audit_contid_valid(contid)) > + return; > + audit_netns_contid_del(ns->net_ns, contid); > + if (new) > + audit_netns_contid_add(new->net_ns, contid); > +} > + > void audit_panic(const char *message) > { > switch (audit_failure) { > @@ -1619,7 +1694,6 @@ static int __net_init audit_net_init(struct net *net) > .flags = NL_CFG_F_NONROOT_RECV, > .groups = AUDIT_NLGRP_MAX, > }; > - > struct audit_net *aunet = net_generic(net, audit_net_id); > > aunet->sk = netlink_kernel_create(net, NETLINK_AUDIT, &cfg); > @@ -1628,7 +1702,8 @@ static int __net_init audit_net_init(struct net *net) > return -ENOMEM; > } > aunet->sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; > - > + INIT_LIST_HEAD(&aunet->contid_list); > + spin_lock_init(&aunet->contid_list_lock); > return 0; > } > > @@ -2380,6 +2455,7 @@ int audit_set_contid(struct task_struct *task, u64 contid) > uid_t uid; > struct tty_struct *tty; > char comm[sizeof(current->comm)]; > + struct net *net = task->nsproxy->net_ns; > > task_lock(task); > /* Can't set if audit disabled */ > @@ -2401,8 +2477,12 @@ int audit_set_contid(struct task_struct *task, u64 contid) > else if (!(thread_group_leader(task) && thread_group_empty(task))) > rc = -EALREADY; > read_unlock(&tasklist_lock); > - if (!rc) > + if (!rc) { > + if (audit_contid_valid(oldcontid)) > + audit_netns_contid_del(net, oldcontid); > task->audit->contid = contid; > + audit_netns_contid_add(net, contid); > + } > task_unlock(task); > > if (!audit_enabled) > diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c > index f6c5d330059a..718b1201ae70 100644 > --- a/kernel/nsproxy.c > +++ b/kernel/nsproxy.c > @@ -27,6 +27,7 @@ > #include > #include > #include > +#include > > static struct kmem_cache *nsproxy_cachep; > > @@ -140,6 +141,7 @@ int copy_namespaces(unsigned long flags, struct task_struct *tsk) > struct nsproxy *old_ns = tsk->nsproxy; > struct user_namespace *user_ns = task_cred_xxx(tsk, user_ns); > struct nsproxy *new_ns; > + u64 contid = audit_get_contid(tsk); > > if (likely(!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | > CLONE_NEWPID | CLONE_NEWNET | > @@ -167,6 +169,7 @@ int copy_namespaces(unsigned long flags, struct task_struct *tsk) > return PTR_ERR(new_ns); > > tsk->nsproxy = new_ns; > + audit_netns_contid_add(new_ns->net_ns, contid); > return 0; > } > > @@ -224,6 +227,7 @@ void switch_task_namespaces(struct task_struct *p, struct nsproxy *new) > ns = p->nsproxy; > p->nsproxy = new; > task_unlock(p); > + audit_switch_task_namespaces(ns, p); > > if (ns && atomic_dec_and_test(&ns->count)) > free_nsproxy(ns); > -- > 1.8.3.1 > > Acked-by: Neil Horman