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conntrack: export lsm context rather than internal secid via netlink 

The conntrack code can export the internal secid to userspace.  These are
dynamic, can change on lsm changes, and have no meaning in userspace.  We
should instead be sending lsm contexts to userspace instead.  This patch sends
the secctx (rather than secid) to userspace over the netlink socket.  We use a
new field CTA_SECCTX and stop using the the old CTA_SECMARK field since it did
not send particularly useful information.

Signed-off-by: Eric Paris <eparis@redhat.com>
Reviewed-by: Paul Moore <paul.moore@hp.com>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Eric Paris 2010-10-13 16:24:54 -04:00 committed by James Morris
parent d5630b9d27
commit 1cc63249ad
2 changed files with 45 additions and 11 deletions
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10
include/linux/netfilter/nfnetlink_conntrack.h
View File

@ -39,8 +39,9 @@ enum ctattr_type {
CTA_TUPLE_MASTER,
CTA_NAT_SEQ_ADJ_ORIG,
CTA_NAT_SEQ_ADJ_REPLY,
CTA_SECMARK,
CTA_SECMARK, /* obsolete */
CTA_ZONE,
CTA_SECCTX,
__CTA_MAX
};
#define CTA_MAX (__CTA_MAX - 1)
@ -172,4 +173,11 @@ enum ctattr_help {
};
#define CTA_HELP_MAX (__CTA_HELP_MAX - 1)
enum ctattr_secctx {
CTA_SECCTX_UNSPEC,
CTA_SECCTX_NAME,
__CTA_SECCTX_MAX
};
#define CTA_SECCTX_MAX (__CTA_SECCTX_MAX - 1)
#endif /* _IPCONNTRACK_NETLINK_H */

46
net/netfilter/nf_conntrack_netlink.c
View File

@ -22,6 +22,7 @@
#include <linux/rculist_nulls.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/security.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <linux/netlink.h>
@ -245,16 +246,31 @@ nla_put_failure:
#ifdef CONFIG_NF_CONNTRACK_SECMARK
static inline int
ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
{
NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
return 0;
struct nlattr *nest_secctx;
int len, ret;
char *secctx;
ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
if (ret)
return ret;
ret = -1;
nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
if (!nest_secctx)
goto nla_put_failure;
NLA_PUT_STRING(skb, CTA_SECCTX_NAME, secctx);
nla_nest_end(skb, nest_secctx);
ret = 0;
nla_put_failure:
return -1;
security_release_secctx(secctx, len);
return ret;
}
#else
#define ctnetlink_dump_secmark(a, b) (0)
#define ctnetlink_dump_secctx(a, b) (0)
#endif
#define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
@ -391,7 +407,7 @@ ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
ctnetlink_dump_protoinfo(skb, ct) < 0 ||
ctnetlink_dump_helpinfo(skb, ct) < 0 ||
ctnetlink_dump_mark(skb, ct) < 0 ||
ctnetlink_dump_secmark(skb, ct) < 0 ||
ctnetlink_dump_secctx(skb, ct) < 0 ||
ctnetlink_dump_id(skb, ct) < 0 ||
ctnetlink_dump_use(skb, ct) < 0 ||
ctnetlink_dump_master(skb, ct) < 0 ||
@ -437,6 +453,17 @@ ctnetlink_counters_size(const struct nf_conn *ct)
;
}
#ifdef CONFIG_NF_CONNTRACK_SECMARK
static int ctnetlink_nlmsg_secctx_size(const struct nf_conn *ct)
{
int len;
security_secid_to_secctx(ct->secmark, NULL, &len);
return sizeof(char) * len;
}
#endif
static inline size_t
ctnetlink_nlmsg_size(const struct nf_conn *ct)
{
@ -453,7 +480,8 @@ ctnetlink_nlmsg_size(const struct nf_conn *ct)
+ nla_total_size(0) /* CTA_HELP */
+ nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
#ifdef CONFIG_NF_CONNTRACK_SECMARK
+ nla_total_size(sizeof(u_int32_t)) /* CTA_SECMARK */
+ nla_total_size(0) /* CTA_SECCTX */
+ nla_total_size(ctnetlink_nlmsg_secctx_size(ct)) /* CTA_SECCTX_NAME */
#endif
#ifdef CONFIG_NF_NAT_NEEDED
+ 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
@ -554,11 +582,9 @@ ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
&& ctnetlink_dump_helpinfo(skb, ct) < 0)
goto nla_put_failure;
#ifdef CONFIG_NF_CONNTRACK_SECMARK
if ((events & (1 << IPCT_SECMARK) || ct->secmark)
&& ctnetlink_dump_secmark(skb, ct) < 0)
&& ctnetlink_dump_secctx(skb, ct) < 0)
goto nla_put_failure;
#endif
if (events & (1 << IPCT_RELATED) &&
ctnetlink_dump_master(skb, ct) < 0)