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NetLabel: Add IP address family information to the netlbl_skbuff_getattr() function 

In order to do any sort of IP header inspection of incoming packets we need to
know which address family, AF_INET/AF_INET6/etc., it belongs to and since the
sk_buff structure does not store this information we need to pass along the
address family separate from the packet itself.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Paul Moore 2008-01-29 08:38:04 -05:00 committed by James Morris
parent 16efd45435
commit 75e22910cf
5 changed files with 42 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/netlabel.h
View File

@ -363,6 +363,7 @@ int netlbl_sock_setattr(struct sock *sk,
int netlbl_sock_getattr(struct sock *sk,
struct netlbl_lsm_secattr *secattr);
int netlbl_skbuff_getattr(const struct sk_buff *skb,
u16 family,
struct netlbl_lsm_secattr *secattr);
void netlbl_skbuff_err(struct sk_buff *skb, int error);
@ -415,6 +416,7 @@ static inline int netlbl_sock_getattr(struct sock *sk,
return -ENOSYS;
}
static inline int netlbl_skbuff_getattr(const struct sk_buff *skb,
u16 family,
struct netlbl_lsm_secattr *secattr)
{
return -ENOSYS;

2
net/netlabel/netlabel_kapi.c
View File

@ -332,6 +332,7 @@ int netlbl_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
/**
* netlbl_skbuff_getattr - Determine the security attributes of a packet
* @skb: the packet
* @family: protocol family
* @secattr: the security attributes
*
* Description:
@ -342,6 +343,7 @@ int netlbl_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
*
*/
int netlbl_skbuff_getattr(const struct sk_buff *skb,
u16 family,
struct netlbl_lsm_secattr *secattr)
{
if (CIPSO_V4_OPTEXIST(skb) &&

33
security/selinux/hooks.c
View File

@ -3429,6 +3429,7 @@ static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad,
/**
* selinux_skb_extlbl_sid - Determine the external label of a packet
* @skb: the packet
* @family: protocol family
* @sid: the packet's SID
*
* Description:
@ -3441,13 +3442,16 @@ static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad,
* selinux_netlbl_skbuff_getsid().
*
*/
static void selinux_skb_extlbl_sid(struct sk_buff *skb, u32 *sid)
static void selinux_skb_extlbl_sid(struct sk_buff *skb,
u16 family,
u32 *sid)
{
u32 xfrm_sid;
u32 nlbl_sid;
selinux_skb_xfrm_sid(skb, &xfrm_sid);
if (selinux_netlbl_skbuff_getsid(skb,
family,
(xfrm_sid == SECSID_NULL ?
SECINITSID_NETMSG : xfrm_sid),
&nlbl_sid) != 0)
@ -3940,7 +3944,7 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
if (err)
goto out;
err = selinux_netlbl_sock_rcv_skb(sksec, skb, &ad);
err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad);
if (err)
goto out;
@ -3996,18 +4000,25 @@ out:
static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
{
u32 peer_secid = SECSID_NULL;
int err = 0;
u16 family;
if (sock && sock->sk->sk_family == PF_UNIX)
if (sock)
family = sock->sk->sk_family;
else if (skb && skb->sk)
family = skb->sk->sk_family;
else
goto out;
if (sock && family == PF_UNIX)
selinux_get_inode_sid(SOCK_INODE(sock), &peer_secid);
else if (skb)
selinux_skb_extlbl_sid(skb, &peer_secid);
selinux_skb_extlbl_sid(skb, family, &peer_secid);
if (peer_secid == SECSID_NULL)
err = -EINVAL;
out:
*secid = peer_secid;
return err;
if (peer_secid == SECSID_NULL)
return -EINVAL;
return 0;
}
static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority)
@ -4062,7 +4073,7 @@ static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
u32 newsid;
u32 peersid;
selinux_skb_extlbl_sid(skb, &peersid);
selinux_skb_extlbl_sid(skb, sk->sk_family, &peersid);
if (peersid == SECSID_NULL) {
req->secid = sksec->sid;
req->peer_secid = SECSID_NULL;
@ -4100,7 +4111,7 @@ static void selinux_inet_conn_established(struct sock *sk,
{
struct sk_security_struct *sksec = sk->sk_security;
selinux_skb_extlbl_sid(skb, &sksec->peer_sid);
selinux_skb_extlbl_sid(skb, sk->sk_family, &sksec->peer_sid);
}
static void selinux_req_classify_flow(const struct request_sock *req,

8
security/selinux/include/netlabel.h
View File

@ -46,13 +46,17 @@ void selinux_netlbl_sk_security_init(struct sk_security_struct *ssec,
void selinux_netlbl_sk_security_clone(struct sk_security_struct *ssec,
struct sk_security_struct *newssec);
int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, u32 base_sid, u32 *sid);
int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
u16 family,
u32 base_sid,
u32 *sid);
void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock);
int selinux_netlbl_socket_post_create(struct socket *sock);
int selinux_netlbl_inode_permission(struct inode *inode, int mask);
int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
struct sk_buff *skb,
u16 family,
struct avc_audit_data *ad);
int selinux_netlbl_socket_setsockopt(struct socket *sock,
int level,
@ -83,6 +87,7 @@ static inline void selinux_netlbl_sk_security_clone(
}
static inline int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
u16 family,
u32 base_sid,
u32 *sid)
{
@ -106,6 +111,7 @@ static inline int selinux_netlbl_inode_permission(struct inode *inode,
}
static inline int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
struct sk_buff *skb,
u16 family,
struct avc_audit_data *ad)
{
return 0;

12
security/selinux/netlabel.c
View File

@ -144,6 +144,7 @@ void selinux_netlbl_sk_security_clone(struct sk_security_struct *ssec,
/**
* selinux_netlbl_skbuff_getsid - Get the sid of a packet using NetLabel
* @skb: the packet
* @family: protocol family
* @base_sid: the SELinux SID to use as a context for MLS only attributes
* @sid: the SID
*
@ -153,7 +154,10 @@ void selinux_netlbl_sk_security_clone(struct sk_security_struct *ssec,
* assign to the packet. Returns zero on success, negative values on failure.
*
*/
int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, u32 base_sid, u32 *sid)
int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
u16 family,
u32 base_sid,
u32 *sid)
{
int rc;
struct netlbl_lsm_secattr secattr;
@ -164,7 +168,7 @@ int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, u32 base_sid, u32 *sid)
}
netlbl_secattr_init(&secattr);
rc = netlbl_skbuff_getattr(skb, &secattr);
rc = netlbl_skbuff_getattr(skb, family, &secattr);
if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) {
rc = security_netlbl_secattr_to_sid(&secattr, base_sid, sid);
if (rc == 0 &&
@ -292,6 +296,7 @@ int selinux_netlbl_inode_permission(struct inode *inode, int mask)
* selinux_netlbl_sock_rcv_skb - Do an inbound access check using NetLabel
* @sksec: the sock's sk_security_struct
* @skb: the packet
* @family: protocol family
* @ad: the audit data
*
* Description:
@ -302,6 +307,7 @@ int selinux_netlbl_inode_permission(struct inode *inode, int mask)
*/
int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
struct sk_buff *skb,
u16 family,
struct avc_audit_data *ad)
{
int rc;
@ -313,7 +319,7 @@ int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
return 0;
netlbl_secattr_init(&secattr);
rc = netlbl_skbuff_getattr(skb, &secattr);
rc = netlbl_skbuff_getattr(skb, family, &secattr);
if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) {
rc = security_netlbl_secattr_to_sid(&secattr,
SECINITSID_NETMSG,