[PATCH] Reworked patch for labels on user space messages
The below patch should be applied after the inode and ipc sid patches.
This patch is a reworking of Tim's patch that has been updated to match
the inode and ipc patches since its similar.
[updated:
> Stephen Smalley also wanted to change a variable from isec to tsec in the
> user sid patch. ]
Signed-off-by: Steve Grubb <sgrubb@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index f8f3d1c..87b8a57 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -143,6 +143,7 @@
__u32 dst_group;
kernel_cap_t eff_cap;
__u32 loginuid; /* Login (audit) uid */
+ __u32 sid; /* SELinux security id */
};
#define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
diff --git a/include/linux/selinux.h b/include/linux/selinux.h
index 413d667..4047bcd 100644
--- a/include/linux/selinux.h
+++ b/include/linux/selinux.h
@@ -5,6 +5,7 @@
*
* Copyright (C) 2005 Red Hat, Inc., James Morris <jmorris@redhat.com>
* Copyright (C) 2006 Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
+ * Copyright (C) 2006 IBM Corporation, Timothy R. Chavez <tinytim@us.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2,
@@ -108,6 +109,16 @@
*/
void selinux_get_ipc_sid(const struct kern_ipc_perm *ipcp, u32 *sid);
+/**
+ * selinux_get_task_sid - return the SID of task
+ * @tsk: the task whose SID will be returned
+ * @sid: pointer to security context ID to be filled in.
+ *
+ * Returns nothing
+ */
+void selinux_get_task_sid(struct task_struct *tsk, u32 *sid);
+
+
#else
static inline int selinux_audit_rule_init(u32 field, u32 op,
@@ -156,6 +167,11 @@
*sid = 0;
}
+static inline void selinux_get_task_sid(struct task_struct *tsk, u32 *sid)
+{
+ *sid = 0;
+}
+
#endif /* CONFIG_SECURITY_SELINUX */
#endif /* _LINUX_SELINUX_H */
diff --git a/kernel/audit.c b/kernel/audit.c
index 9060be7..7ec9cca 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -390,7 +390,7 @@
static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
{
- u32 uid, pid, seq;
+ u32 uid, pid, seq, sid;
void *data;
struct audit_status *status_get, status_set;
int err;
@@ -416,6 +416,7 @@
pid = NETLINK_CREDS(skb)->pid;
uid = NETLINK_CREDS(skb)->uid;
loginuid = NETLINK_CB(skb).loginuid;
+ sid = NETLINK_CB(skb).sid;
seq = nlh->nlmsg_seq;
data = NLMSG_DATA(nlh);
@@ -468,8 +469,23 @@
ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
if (ab) {
audit_log_format(ab,
- "user pid=%d uid=%u auid=%u msg='%.1024s'",
- pid, uid, loginuid, (char *)data);
+ "user pid=%d uid=%u auid=%u",
+ pid, uid, loginuid);
+ if (sid) {
+ char *ctx = NULL;
+ u32 len;
+ if (selinux_ctxid_to_string(
+ sid, &ctx, &len)) {
+ audit_log_format(ab,
+ " subj=%u", sid);
+ /* Maybe call audit_panic? */
+ } else
+ audit_log_format(ab,
+ " subj=%s", ctx);
+ kfree(ctx);
+ }
+ audit_log_format(ab, " msg='%.1024s'",
+ (char *)data);
audit_set_pid(ab, pid);
audit_log_end(ab);
}
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 2a233ff..09fbc4b 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -56,6 +56,7 @@
#include <linux/mm.h>
#include <linux/types.h>
#include <linux/audit.h>
+#include <linux/selinux.h>
#include <net/sock.h>
#include <net/scm.h>
@@ -1157,6 +1158,7 @@
NETLINK_CB(skb).dst_pid = dst_pid;
NETLINK_CB(skb).dst_group = dst_group;
NETLINK_CB(skb).loginuid = audit_get_loginuid(current->audit_context);
+ selinux_get_task_sid(current, &(NETLINK_CB(skb).sid));
memcpy(NETLINK_CREDS(skb), &siocb->scm->creds, sizeof(struct ucred));
/* What can I do? Netlink is asynchronous, so that
diff --git a/security/selinux/exports.c b/security/selinux/exports.c
index 7357cf2..ae4c73e 100644
--- a/security/selinux/exports.c
+++ b/security/selinux/exports.c
@@ -5,6 +5,7 @@
*
* Copyright (C) 2005 Red Hat, Inc., James Morris <jmorris@redhat.com>
* Copyright (C) 2006 Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
+ * Copyright (C) 2006 IBM Corporation, Timothy R. Chavez <tinytim@us.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2,
@@ -61,3 +62,13 @@
*sid = 0;
}
+void selinux_get_task_sid(struct task_struct *tsk, u32 *sid)
+{
+ if (selinux_enabled) {
+ struct task_security_struct *tsec = tsk->security;
+ *sid = tsec->sid;
+ return;
+ }
+ *sid = 0;
+}
+
