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selinux: Fix missing calls to netlbl_skbuff_err()

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At some point I think I messed up and dropped the calls to netlbl_skbuff_err()
which are necessary for CIPSO to send error notifications to remote systems.
This patch re-introduces the error handling calls into the SELinux code.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Acked-by: James Morris <jmorris@namei.org>
This commit is contained in:
Paul Moore 2008-10-10 10:16:31 -04:00
parent 99d854d231
commit dfaebe9825
5 changed files with 50 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/net/netlabel.h
View File

@ -382,7 +382,7 @@ int netlbl_sock_getattr(struct sock *sk,
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);
void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway);
/*
* LSM label mapping cache operations
@ -454,7 +454,9 @@ static inline int netlbl_skbuff_getattr(const struct sk_buff *skb,
{
return -ENOSYS;
}
static inline void netlbl_skbuff_err(struct sk_buff *skb, int error)
static inline void netlbl_skbuff_err(struct sk_buff *skb,
int error,
int gateway)
{
return;
}

5
net/netlabel/netlabel_kapi.c
View File

@ -490,6 +490,7 @@ int netlbl_skbuff_getattr(const struct sk_buff *skb,
* netlbl_skbuff_err - Handle a LSM error on a sk_buff
* @skb: the packet
* @error: the error code
* @gateway: true if host is acting as a gateway, false otherwise
*
* Description:
* Deal with a LSM problem when handling the packet in @skb, typically this is
@ -497,10 +498,10 @@ int netlbl_skbuff_getattr(const struct sk_buff *skb,
* according to the packet's labeling protocol.
*
*/
void netlbl_skbuff_err(struct sk_buff *skb, int error)
void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
{
if (CIPSO_V4_OPTEXIST(skb))
cipso_v4_error(skb, error, 0);
cipso_v4_error(skb, error, gateway);
}
/**

19
security/selinux/hooks.c
View File

@ -4101,6 +4101,8 @@ static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
return err;
err = avc_has_perm(sk_sid, peer_sid,
SECCLASS_PEER, PEER__RECV, &ad);
if (err)
selinux_netlbl_err(skb, err, 0);
} else {
err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad);
if (err)
@ -4156,10 +4158,14 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
return err;
err = selinux_inet_sys_rcv_skb(skb->iif, addrp, family,
peer_sid, &ad);
if (err)
if (err) {
selinux_netlbl_err(skb, err, 0);
return err;
}
err = avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER,
PEER__RECV, &ad);
if (err)
selinux_netlbl_err(skb, err, 0);
}
if (secmark_active) {
@ -4396,6 +4402,7 @@ out:
static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex,
u16 family)
{
int err;
char *addrp;
u32 peer_sid;
struct avc_audit_data ad;
@ -4419,10 +4426,14 @@ static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex,
if (selinux_parse_skb(skb, &ad, &addrp, 1, NULL) != 0)
return NF_DROP;
if (peerlbl_active)
if (selinux_inet_sys_rcv_skb(ifindex, addrp, family,
peer_sid, &ad) != 0)
if (peerlbl_active) {
err = selinux_inet_sys_rcv_skb(ifindex, addrp, family,
peer_sid, &ad);
if (err) {
selinux_netlbl_err(skb, err, 1);
return NF_DROP;
}
}
if (secmark_active)
if (avc_has_perm(peer_sid, skb->secmark,

9
security/selinux/include/netlabel.h
View File

@ -39,6 +39,8 @@
#ifdef CONFIG_NETLABEL
void selinux_netlbl_cache_invalidate(void);
void selinux_netlbl_err(struct sk_buff *skb, int error, int gateway);
void selinux_netlbl_sk_security_reset(struct sk_security_struct *ssec,
int family);
@ -63,6 +65,13 @@ static inline void selinux_netlbl_cache_invalidate(void)
return;
}
static inline void selinux_netlbl_err(struct sk_buff *skb,
int error,
int gateway)
{
return;
}
static inline void selinux_netlbl_sk_security_reset(
struct sk_security_struct *ssec,
int family)

20
security/selinux/netlabel.c
View File

@ -107,6 +107,24 @@ void selinux_netlbl_cache_invalidate(void)
netlbl_cache_invalidate();
}
/**
* selinux_netlbl_err - Handle a NetLabel packet error
* @skb: the packet
* @error: the error code
* @gateway: true if host is acting as a gateway, false otherwise
*
* Description:
* When a packet is dropped due to a call to avc_has_perm() pass the error
* code to the NetLabel subsystem so any protocol specific processing can be
* done. This is safe to call even if you are unsure if NetLabel labeling is
* present on the packet, NetLabel is smart enough to only act when it should.
*
*/
void selinux_netlbl_err(struct sk_buff *skb, int error, int gateway)
{
netlbl_skbuff_err(skb, error, gateway);
}
/**
* selinux_netlbl_sk_security_reset - Reset the NetLabel fields
* @ssec: the sk_security_struct
@ -289,7 +307,7 @@ int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
return 0;
if (nlbl_sid != SECINITSID_UNLABELED)
netlbl_skbuff_err(skb, rc);
netlbl_skbuff_err(skb, rc, 0);
return rc;
}