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[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>
This commit is contained in:
Steve Grubb 2006-04-03 09:08:13 -04:00 committed by Al Viro
parent 9c7aa6aa74
commit e7c3497013
5 changed files with 49 additions and 3 deletions
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1
include/linux/netlink.h
View File

@ -143,6 +143,7 @@ struct netlink_skb_parms
__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))

16
include/linux/selinux.h
View File

@ -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_inode_sid(const struct inode *inode, u32 *sid);
*/
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 @@ static inline void selinux_get_ipc_sid(const struct kern_ipc_perm *ipcp, u32 *si
*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 */

22
kernel/audit.c
View File

@ -390,7 +390,7 @@ static int audit_netlink_ok(kernel_cap_t eff_cap, u16 msg_type)
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 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
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 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
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);
}

2
net/netlink/af_netlink.c
View File

@ -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 @@ static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock,
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

11
security/selinux/exports.c
View File

@ -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 @@ void selinux_get_ipc_sid(const struct kern_ipc_perm *ipcp, u32 *sid)
*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;
}