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| author | Richard Guy Briggs <rgb@redhat.com> | 2014-04-22 21:31:56 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-04-22 21:42:27 -0400 |
| commit | 3a101b8de0d39403b2c7e5c23fd0b005668acf48 (patch) | |
| tree | b7bce9802ac01cfeb96167d3bdc14b90703b9672 | |
| parent | 7774d5e03f4a41ec7c1e736acc108f112003bb4a (diff) | |
| download | linux-3a101b8de0d39403b2c7e5c23fd0b005668acf48.tar.gz linux-3a101b8de0d39403b2c7e5c23fd0b005668acf48.tar.bz2 linux-3a101b8de0d39403b2c7e5c23fd0b005668acf48.zip | |
audit: add netlink audit protocol bind to check capabilities on multicast join
Register a netlink per-protocol bind fuction for audit to check userspace
process capabilities before allowing a multicast group connection.
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/uapi/linux/capability.h | 7 | ||||
| -rw-r--r-- | kernel/audit.c | 10 | ||||
| -rw-r--r-- | security/selinux/include/classmap.h | 2 |
3 files changed, 17 insertions, 2 deletions
diff --git a/include/uapi/linux/capability.h b/include/uapi/linux/capability.h index 154dd6d3c8fe..12c37a197d24 100644 --- a/include/uapi/linux/capability.h +++ b/include/uapi/linux/capability.h @@ -347,7 +347,12 @@ struct vfs_cap_data { #define CAP_BLOCK_SUSPEND 36 -#define CAP_LAST_CAP CAP_BLOCK_SUSPEND +/* Allow reading the audit log via multicast netlink socket */ + +#define CAP_AUDIT_READ 37 + + +#define CAP_LAST_CAP CAP_AUDIT_READ #define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP) diff --git a/kernel/audit.c b/kernel/audit.c index 7c2893602d06..223cb746f141 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -1076,10 +1076,20 @@ static void audit_receive(struct sk_buff *skb) mutex_unlock(&audit_cmd_mutex); } +/* Run custom bind function on netlink socket group connect or bind requests. */ +static int audit_bind(int group) +{ + if (!capable(CAP_AUDIT_READ)) + return -EPERM; + + return 0; +} + static int __net_init audit_net_init(struct net *net) { struct netlink_kernel_cfg cfg = { .input = audit_receive, + .bind = audit_bind, }; struct audit_net *aunet = net_generic(net, audit_net_id); diff --git a/security/selinux/include/classmap.h b/security/selinux/include/classmap.h index 14d04e63b1f0..be491a74c1ed 100644 --- a/security/selinux/include/classmap.h +++ b/security/selinux/include/classmap.h @@ -147,7 +147,7 @@ struct security_class_mapping secclass_map[] = { { "peer", { "recv", NULL } }, { "capability2", { "mac_override", "mac_admin", "syslog", "wake_alarm", "block_suspend", - NULL } }, + "audit_read", NULL } }, { "kernel_service", { "use_as_override", "create_files_as", NULL } }, { "tun_socket", { COMMON_SOCK_PERMS, "attach_queue", NULL } }, |