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[PATCH] promiscuous mode

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Hi,

When a network interface goes into promiscuous mode, its an important security
issue. The attached patch is intended to capture that action and send an
event to the audit system.

The patch carves out a new block of numbers for kernel detected anomalies.
These are events that may indicate suspicious activity. Other examples of
potential kernel anomalies would be: exceeding disk quota, rlimit violations,
changes to syscall entry table.

Signed-off-by: Steve Grubb <sgrubb@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Steve Grubb 2005-12-03 08:39:35 -05:00 committed by Al Viro
parent a6c043a887
commit 5bdb988680
2 changed files with 13 additions and 1 deletions
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7
include/linux/audit.h
View File

@ -35,7 +35,8 @@
* 1400 - 1499 SE Linux use * 1400 - 1499 SE Linux use
* 1500 - 1599 kernel LSPP events * 1500 - 1599 kernel LSPP events
* 1600 - 1699 kernel crypto events * 1600 - 1699 kernel crypto events
* 1700 - 1999 future kernel use (maybe integrity labels and related events) * 1700 - 1799 kernel anomaly records
* 1800 - 1999 future kernel use (maybe integrity labels and related events)
* 2000 is for otherwise unclassified kernel audit messages (legacy) * 2000 is for otherwise unclassified kernel audit messages (legacy)
* 2001 - 2099 unused (kernel) * 2001 - 2099 unused (kernel)
* 2100 - 2199 user space anomaly records * 2100 - 2199 user space anomaly records
@ -90,6 +91,10 @@
#define AUDIT_MAC_STATUS 1404 /* Changed enforcing,permissive,off */ #define AUDIT_MAC_STATUS 1404 /* Changed enforcing,permissive,off */
#define AUDIT_MAC_CONFIG_CHANGE 1405 /* Changes to booleans */ #define AUDIT_MAC_CONFIG_CHANGE 1405 /* Changes to booleans */
#define AUDIT_FIRST_KERN_ANOM_MSG 1700
#define AUDIT_LAST_KERN_ANOM_MSG 1799
#define AUDIT_ANOM_PROMISCUOUS 1700 /* Device changed promiscuous mode */
#define AUDIT_KERNEL 2000 /* Asynchronous audit record. NOT A REQUEST. */ #define AUDIT_KERNEL 2000 /* Asynchronous audit record. NOT A REQUEST. */
/* Rule flags */ /* Rule flags */

7
net/core/dev.c
View File

@ -115,6 +115,7 @@
#include <net/iw_handler.h> #include <net/iw_handler.h>
#endif /* CONFIG_NET_RADIO */ #endif /* CONFIG_NET_RADIO */
#include <asm/current.h> #include <asm/current.h>
#include <linux/audit.h>
/* /*
* The list of packet types we will receive (as opposed to discard) * The list of packet types we will receive (as opposed to discard)
@ -2120,6 +2121,12 @@ void dev_set_promiscuity(struct net_device *dev, int inc)
printk(KERN_INFO "device %s %s promiscuous mode\n", printk(KERN_INFO "device %s %s promiscuous mode\n",
dev->name, (dev->flags & IFF_PROMISC) ? "entered" : dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
"left"); "left");
audit_log(current->audit_context, GFP_ATOMIC,
AUDIT_ANOM_PROMISCUOUS,
"dev=%s prom=%d old_prom=%d auid=%u",
dev->name, (dev->flags & IFF_PROMISC),
(old_flags & IFF_PROMISC),
audit_get_loginuid(current->audit_context));
} }
} }