From: Casey Schaufler <casey@schaufler-ca.com>
To: casey.schaufler@intel.com, jmorris@namei.org,
linux-security-module@vger.kernel.org, selinux@vger.kernel.org
Cc: casey@schaufler-ca.com, keescook@chromium.org,
john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp,
paul@paul-moore.com, sds@tycho.nsa.gov
Subject: [PATCH v11 18/25] LSM: security_secid_to_secctx in netlink netfilter
Date: Wed, 13 Nov 2019 09:57:14 -0800 [thread overview]
Message-ID: <20191113175721.2317-19-casey@schaufler-ca.com> (raw)
In-Reply-To: <20191113175721.2317-1-casey@schaufler-ca.com>
Change netlink netfilter interfaces to use lsmcontext
pointers, and remove scaffolding.
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
cc: netdev@vger.kernel.org
---
net/netfilter/nfnetlink_queue.c | 32 +++++++++++++-------------------
1 file changed, 13 insertions(+), 19 deletions(-)
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index 2d6668fd026c..a1296453d8f2 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -301,12 +301,10 @@ static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk)
return -1;
}
-static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
+static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, struct lsmcontext *context)
{
- u32 seclen = 0;
#if IS_ENABLED(CONFIG_NETWORK_SECMARK)
struct lsmblob blob;
- struct lsmcontext context = { };
if (!skb || !sk_fullsock(skb->sk))
return 0;
@@ -314,15 +312,16 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
read_lock_bh(&skb->sk->sk_callback_lock);
if (skb->secmark) {
+ /* Any LSM might be looking for the secmark */
lsmblob_init(&blob, skb->secmark);
- security_secid_to_secctx(&blob, &context);
- *secdata = context.context;
+ security_secid_to_secctx(&blob, context);
}
read_unlock_bh(&skb->sk->sk_callback_lock);
- seclen = context.len;
+ return context->len;
+#else
+ return 0;
#endif
- return seclen;
}
static u32 nfqnl_get_bridge_size(struct nf_queue_entry *entry)
@@ -398,8 +397,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
enum ip_conntrack_info uninitialized_var(ctinfo);
struct nfnl_ct_hook *nfnl_ct;
bool csum_verify;
- struct lsmcontext scaff; /* scaffolding */
- char *secdata = NULL;
+ struct lsmcontext context = { };
u32 seclen = 0;
size = nlmsg_total_size(sizeof(struct nfgenmsg))
@@ -466,7 +464,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
}
if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) {
- seclen = nfqnl_get_sk_secctx(entskb, &secdata);
+ seclen = nfqnl_get_sk_secctx(entskb, &context);
if (seclen)
size += nla_total_size(seclen);
}
@@ -601,7 +599,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
nfqnl_put_sk_uidgid(skb, entskb->sk) < 0)
goto nla_put_failure;
- if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata))
+ if (seclen && nla_put(skb, NFQA_SECCTX, context.len, context.context))
goto nla_put_failure;
if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0)
@@ -629,10 +627,8 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
}
nlh->nlmsg_len = skb->len;
- if (seclen) {
- lsmcontext_init(&scaff, secdata, seclen, 0);
- security_release_secctx(&scaff);
- }
+ if (seclen)
+ security_release_secctx(&context);
return skb;
nla_put_failure:
@@ -640,10 +636,8 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
kfree_skb(skb);
net_err_ratelimited("nf_queue: error creating packet message\n");
nlmsg_failure:
- if (seclen) {
- lsmcontext_init(&scaff, secdata, seclen, 0);
- security_release_secctx(&scaff);
- }
+ if (seclen)
+ security_release_secctx(&context);
return NULL;
}
--
2.20.1
next prev parent reply other threads:[~2019-11-13 17:59 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20191113175721.2317-1-casey.ref@schaufler-ca.com>
2019-11-13 17:56 ` [PATCH v11 00/25] LSM: Module stacking for AppArmor Casey Schaufler
2019-11-13 17:56 ` [PATCH v11 01/25] LSM: Infrastructure management of the sock security Casey Schaufler
2019-11-13 17:56 ` [PATCH v11 02/25] LSM: Create and manage the lsmblob data structure Casey Schaufler
2019-11-21 5:36 ` James Morris
2019-11-13 17:56 ` [PATCH v11 03/25] LSM: Use lsmblob in security_audit_rule_match Casey Schaufler
2019-11-21 5:38 ` James Morris
2019-11-13 17:57 ` [PATCH v11 04/25] LSM: Use lsmblob in security_kernel_act_as Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 05/25] net: Prepare UDS for security module stacking Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 06/25] LSM: Use lsmblob in security_secctx_to_secid Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 07/25] LSM: Use lsmblob in security_secid_to_secctx Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 08/25] LSM: Use lsmblob in security_ipc_getsecid Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 09/25] LSM: Use lsmblob in security_task_getsecid Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 10/25] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 11/25] LSM: Use lsmblob in security_cred_getsecid Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 12/25] IMA: Change internal interfaces to use lsmblobs Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 13/25] LSM: Specify which LSM to display Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 14/25] LSM: Ensure the correct LSM context releaser Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 15/25] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 16/25] LSM: Use lsmcontext in security_dentry_init_security Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 17/25] LSM: Use lsmcontext in security_inode_getsecctx Casey Schaufler
2019-11-21 5:50 ` James Morris
2019-11-13 17:57 ` Casey Schaufler [this message]
2019-11-13 18:24 [PATCH v11 00/25] LSM: Module stacking for AppArmor Casey Schaufler
2019-11-13 18:24 ` [PATCH v11 18/25] LSM: security_secid_to_secctx in netlink netfilter Casey Schaufler
2019-11-21 19:01 ` John Johansen
2019-11-21 20:36 ` James Morris
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