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[NetLabel]: correct improper handling of non-NetLabel peer contexts 

Fix a problem where NetLabel would always set the value of 
sk_security_struct->peer_sid in selinux_netlbl_sock_graft() to the context of
the socket, causing problems when users would query the context of the
connection.  This patch fixes this so that the value in
sk_security_struct->peer_sid is only set when the connection is NetLabel based,
otherwise the value is untouched.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul Moore 2006-09-25 15:52:01 -07:00 committed by David S. Miller
parent 597811ec16
commit 14a72f53fb
5 changed files with 101 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/net/cipso_ipv4.h
View File

@ -205,6 +205,7 @@ void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
int cipso_v4_socket_setattr(const struct socket *sock,
const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr);
int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
int cipso_v4_socket_getattr(const struct socket *sock,
struct netlbl_lsm_secattr *secattr);
int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
@ -225,6 +226,12 @@ static inline int cipso_v4_socket_setattr(const struct socket *sock,
return -ENOSYS;
}
static inline int cipso_v4_sock_getattr(struct sock *sk,
struct netlbl_lsm_secattr *secattr)
{
return -ENOSYS;
}
static inline int cipso_v4_socket_getattr(const struct socket *sock,
struct netlbl_lsm_secattr *secattr)
{

8
include/net/netlabel.h
View File

@ -238,6 +238,8 @@ static inline void netlbl_secattr_free(struct netlbl_lsm_secattr *secattr,
#ifdef CONFIG_NETLABEL
int netlbl_socket_setattr(const struct socket *sock,
const struct netlbl_lsm_secattr *secattr);
int netlbl_sock_getattr(struct sock *sk,
struct netlbl_lsm_secattr *secattr);
int netlbl_socket_getattr(const struct socket *sock,
struct netlbl_lsm_secattr *secattr);
int netlbl_skbuff_getattr(const struct sk_buff *skb,
@ -250,6 +252,12 @@ static inline int netlbl_socket_setattr(const struct socket *sock,
return -ENOSYS;
}
static inline int netlbl_sock_getattr(struct sock *sk,
struct netlbl_lsm_secattr *secattr)
{
return -ENOSYS;
}
static inline int netlbl_socket_getattr(const struct socket *sock,
struct netlbl_lsm_secattr *secattr)
{

86
net/ipv4/cipso_ipv4.c
View File

@ -1485,6 +1485,54 @@ int cipso_v4_socket_setattr(const struct socket *sock,
return ret_val;
}
/**
* cipso_v4_sock_getattr - Get the security attributes from a sock
* @sk: the sock
* @secattr: the security attributes
*
* Description:
* Query @sk to see if there is a CIPSO option attached to the sock and if
* there is return the CIPSO security attributes in @secattr. This function
* requires that @sk be locked, or privately held, but it does not do any
* locking itself. Returns zero on success and negative values on failure.
*
*/
int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
{
int ret_val = -ENOMSG;
struct inet_sock *sk_inet;
unsigned char *cipso_ptr;
u32 doi;
struct cipso_v4_doi *doi_def;
sk_inet = inet_sk(sk);
if (sk_inet->opt == NULL || sk_inet->opt->cipso == 0)
return -ENOMSG;
cipso_ptr = sk_inet->opt->__data + sk_inet->opt->cipso -
sizeof(struct iphdr);
ret_val = cipso_v4_cache_check(cipso_ptr, cipso_ptr[1], secattr);
if (ret_val == 0)
return ret_val;
doi = ntohl(*(u32 *)&cipso_ptr[2]);
rcu_read_lock();
doi_def = cipso_v4_doi_getdef(doi);
if (doi_def == NULL) {
rcu_read_unlock();
return -ENOMSG;
}
switch (cipso_ptr[6]) {
case CIPSO_V4_TAG_RBITMAP:
ret_val = cipso_v4_parsetag_rbm(doi_def,
&cipso_ptr[6],
secattr);
break;
}
rcu_read_unlock();
return ret_val;
}
/**
* cipso_v4_socket_getattr - Get the security attributes from a socket
* @sock: the socket
@ -1499,42 +1547,12 @@ int cipso_v4_socket_setattr(const struct socket *sock,
int cipso_v4_socket_getattr(const struct socket *sock,
struct netlbl_lsm_secattr *secattr)
{
int ret_val = -ENOMSG;
struct sock *sk;
struct inet_sock *sk_inet;
unsigned char *cipso_ptr;
u32 doi;
struct cipso_v4_doi *doi_def;
int ret_val;
sk = sock->sk;
lock_sock(sk);
sk_inet = inet_sk(sk);
if (sk_inet->opt == NULL || sk_inet->opt->cipso == 0)
goto socket_getattr_return;
cipso_ptr = sk_inet->opt->__data + sk_inet->opt->cipso -
sizeof(struct iphdr);
ret_val = cipso_v4_cache_check(cipso_ptr, cipso_ptr[1], secattr);
if (ret_val == 0)
goto socket_getattr_return;
lock_sock(sock->sk);
ret_val = cipso_v4_sock_getattr(sock->sk, secattr);
release_sock(sock->sk);
doi = ntohl(*(u32 *)&cipso_ptr[2]);
rcu_read_lock();
doi_def = cipso_v4_doi_getdef(doi);
if (doi_def == NULL) {
rcu_read_unlock();
goto socket_getattr_return;
}
switch (cipso_ptr[6]) {
case CIPSO_V4_TAG_RBITMAP:
ret_val = cipso_v4_parsetag_rbm(doi_def,
&cipso_ptr[6],
secattr);
break;
}
rcu_read_unlock();
socket_getattr_return:
release_sock(sk);
return ret_val;
}

23
net/netlabel/netlabel_kapi.c
View File

@ -84,6 +84,29 @@ int netlbl_socket_setattr(const struct socket *sock,
return ret_val;
}
/**
* netlbl_sock_getattr - Determine the security attributes of a sock
* @sk: the sock
* @secattr: the security attributes
*
* Description:
* Examines the given sock to see any NetLabel style labeling has been
* applied to the sock, if so it parses the socket label and returns the
* security attributes in @secattr. Returns zero on success, negative values
* on failure.
*
*/
int netlbl_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
{
int ret_val;
ret_val = cipso_v4_sock_getattr(sk, secattr);
if (ret_val == 0)
return 0;
return netlbl_unlabel_getattr(secattr);
}
/**
* netlbl_socket_getattr - Determine the security attributes of a socket
* @sock: the socket

12
security/selinux/ss/services.c
View File

@ -2502,14 +2502,24 @@ void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock)
{
struct inode_security_struct *isec = SOCK_INODE(sock)->i_security;
struct sk_security_struct *sksec = sk->sk_security;
struct netlbl_lsm_secattr secattr;
u32 nlbl_peer_sid;
sksec->sclass = isec->sclass;
if (sk->sk_family != PF_INET)
return;
netlbl_secattr_init(&secattr);
if (netlbl_sock_getattr(sk, &secattr) == 0 &&
selinux_netlbl_secattr_to_sid(NULL,
&secattr,
sksec->sid,
&nlbl_peer_sid) == 0)
sksec->peer_sid = nlbl_peer_sid;
netlbl_secattr_destroy(&secattr, 0);
sksec->nlbl_state = NLBL_REQUIRE;
sksec->peer_sid = sksec->sid;
/* Try to set the NetLabel on the socket to save time later, if we fail
* here we will pick up the pieces in later calls to