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Diffstat (limited to 'security/selinux/hooks.c')
-rw-r--r--security/selinux/hooks.c296
1 files changed, 210 insertions, 86 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 03fc6a81ae32..576e51199079 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -291,6 +291,7 @@ static void sk_free_security(struct sock *sk)
struct sk_security_struct *ssec = sk->sk_security;
sk->sk_security = NULL;
+ selinux_netlbl_sk_security_free(ssec);
kfree(ssec);
}
@@ -324,7 +325,7 @@ enum {
Opt_rootcontext = 4,
};
-static match_table_t tokens = {
+static const match_table_t tokens = {
{Opt_context, CONTEXT_STR "%s"},
{Opt_fscontext, FSCONTEXT_STR "%s"},
{Opt_defcontext, DEFCONTEXT_STR "%s"},
@@ -957,7 +958,8 @@ out_err:
return rc;
}
-void selinux_write_opts(struct seq_file *m, struct security_mnt_opts *opts)
+static void selinux_write_opts(struct seq_file *m,
+ struct security_mnt_opts *opts)
{
int i;
char *prefix;
@@ -1290,7 +1292,7 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
/* Default to the fs superblock SID. */
isec->sid = sbsec->sid;
- if (sbsec->proc) {
+ if (sbsec->proc && !S_ISLNK(inode->i_mode)) {
struct proc_inode *proci = PROC_I(inode);
if (proci->pde) {
isec->sclass = inode_mode_to_security_class(inode->i_mode);
@@ -2120,7 +2122,6 @@ static inline void flush_unauthorized_files(struct files_struct *files)
long j = -1;
int drop_tty = 0;
- mutex_lock(&tty_mutex);
tty = get_current_tty();
if (tty) {
file_list_lock();
@@ -2138,8 +2139,8 @@ static inline void flush_unauthorized_files(struct files_struct *files)
}
}
file_list_unlock();
+ tty_kref_put(tty);
}
- mutex_unlock(&tty_mutex);
/* Reset controlling tty. */
if (drop_tty)
no_tty();
@@ -3548,38 +3549,44 @@ out:
#endif /* IPV6 */
static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad,
- char **addrp, int src, u8 *proto)
+ char **_addrp, int src, u8 *proto)
{
- int ret = 0;
+ char *addrp;
+ int ret;
switch (ad->u.net.family) {
case PF_INET:
ret = selinux_parse_skb_ipv4(skb, ad, proto);
- if (ret || !addrp)
- break;
- *addrp = (char *)(src ? &ad->u.net.v4info.saddr :
- &ad->u.net.v4info.daddr);
- break;
+ if (ret)
+ goto parse_error;
+ addrp = (char *)(src ? &ad->u.net.v4info.saddr :
+ &ad->u.net.v4info.daddr);
+ goto okay;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
case PF_INET6:
ret = selinux_parse_skb_ipv6(skb, ad, proto);
- if (ret || !addrp)
- break;
- *addrp = (char *)(src ? &ad->u.net.v6info.saddr :
- &ad->u.net.v6info.daddr);
- break;
+ if (ret)
+ goto parse_error;
+ addrp = (char *)(src ? &ad->u.net.v6info.saddr :
+ &ad->u.net.v6info.daddr);
+ goto okay;
#endif /* IPV6 */
default:
- break;
+ addrp = NULL;
+ goto okay;
}
- if (unlikely(ret))
- printk(KERN_WARNING
- "SELinux: failure in selinux_parse_skb(),"
- " unable to parse packet\n");
-
+parse_error:
+ printk(KERN_WARNING
+ "SELinux: failure in selinux_parse_skb(),"
+ " unable to parse packet\n");
return ret;
+
+okay:
+ if (_addrp)
+ *_addrp = addrp;
+ return 0;
}
/**
@@ -3794,6 +3801,7 @@ out:
static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen)
{
+ struct sock *sk = sock->sk;
struct inode_security_struct *isec;
int err;
@@ -3807,7 +3815,6 @@ static int selinux_socket_connect(struct socket *sock, struct sockaddr *address,
isec = SOCK_INODE(sock)->i_security;
if (isec->sclass == SECCLASS_TCP_SOCKET ||
isec->sclass == SECCLASS_DCCP_SOCKET) {
- struct sock *sk = sock->sk;
struct avc_audit_data ad;
struct sockaddr_in *addr4 = NULL;
struct sockaddr_in6 *addr6 = NULL;
@@ -3841,6 +3848,8 @@ static int selinux_socket_connect(struct socket *sock, struct sockaddr *address,
goto out;
}
+ err = selinux_netlbl_socket_connect(sk, address);
+
out:
return err;
}
@@ -4070,20 +4079,28 @@ static int selinux_sock_rcv_skb_iptables_compat(struct sock *sk,
}
static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
- struct avc_audit_data *ad,
- u16 family, char *addrp)
+ u16 family)
{
int err;
struct sk_security_struct *sksec = sk->sk_security;
u32 peer_sid;
u32 sk_sid = sksec->sid;
+ struct avc_audit_data ad;
+ char *addrp;
+
+ AVC_AUDIT_DATA_INIT(&ad, NET);
+ ad.u.net.netif = skb->iif;
+ ad.u.net.family = family;
+ err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL);
+ if (err)
+ return err;
if (selinux_compat_net)
- err = selinux_sock_rcv_skb_iptables_compat(sk, skb, ad,
+ err = selinux_sock_rcv_skb_iptables_compat(sk, skb, &ad,
family, addrp);
else
err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
- PACKET__RECV, ad);
+ PACKET__RECV, &ad);
if (err)
return err;
@@ -4092,12 +4109,14 @@ static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
if (err)
return err;
err = avc_has_perm(sk_sid, peer_sid,
- SECCLASS_PEER, PEER__RECV, ad);
+ SECCLASS_PEER, PEER__RECV, &ad);
+ if (err)
+ selinux_netlbl_err(skb, err, 0);
} else {
- err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, ad);
+ err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad);
if (err)
return err;
- err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, ad);
+ err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad);
}
return err;
@@ -4111,6 +4130,8 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
u32 sk_sid = sksec->sid;
struct avc_audit_data ad;
char *addrp;
+ u8 secmark_active;
+ u8 peerlbl_active;
if (family != PF_INET && family != PF_INET6)
return 0;
@@ -4119,6 +4140,18 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
family = PF_INET;
+ /* If any sort of compatibility mode is enabled then handoff processing
+ * to the selinux_sock_rcv_skb_compat() function to deal with the
+ * special handling. We do this in an attempt to keep this function
+ * as fast and as clean as possible. */
+ if (selinux_compat_net || !selinux_policycap_netpeer)
+ return selinux_sock_rcv_skb_compat(sk, skb, family);
+
+ secmark_active = selinux_secmark_enabled();
+ peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled();
+ if (!secmark_active && !peerlbl_active)
+ return 0;
+
AVC_AUDIT_DATA_INIT(&ad, NET);
ad.u.net.netif = skb->iif;
ad.u.net.family = family;
@@ -4126,15 +4159,7 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
if (err)
return err;
- /* If any sort of compatibility mode is enabled then handoff processing
- * to the selinux_sock_rcv_skb_compat() function to deal with the
- * special handling. We do this in an attempt to keep this function
- * as fast and as clean as possible. */
- if (selinux_compat_net || !selinux_policycap_netpeer)
- return selinux_sock_rcv_skb_compat(sk, skb, &ad,
- family, addrp);
-
- if (netlbl_enabled() || selinux_xfrm_enabled()) {
+ if (peerlbl_active) {
u32 peer_sid;
err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
@@ -4142,13 +4167,17 @@ 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 (selinux_secmark_enabled()) {
+ if (secmark_active) {
err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
PACKET__RECV, &ad);
if (err)
@@ -4207,10 +4236,12 @@ static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *
u32 peer_secid = SECSID_NULL;
u16 family;
- if (sock)
+ if (skb && skb->protocol == htons(ETH_P_IP))
+ family = PF_INET;
+ else if (skb && skb->protocol == htons(ETH_P_IPV6))
+ family = PF_INET6;
+ else if (sock)
family = sock->sk->sk_family;
- else if (skb && skb->sk)
- family = skb->sk->sk_family;
else
goto out;
@@ -4268,8 +4299,6 @@ static void selinux_sock_graft(struct sock *sk, struct socket *parent)
sk->sk_family == PF_UNIX)
isec->sid = sksec->sid;
sksec->sclass = isec->sclass;
-
- selinux_netlbl_sock_graft(sk, parent);
}
static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
@@ -4277,10 +4306,15 @@ static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
{
struct sk_security_struct *sksec = sk->sk_security;
int err;
+ u16 family = sk->sk_family;
u32 newsid;
u32 peersid;
- err = selinux_skb_peerlbl_sid(skb, sk->sk_family, &peersid);
+ /* handle mapped IPv4 packets arriving via IPv6 sockets */
+ if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
+ family = PF_INET;
+
+ err = selinux_skb_peerlbl_sid(skb, family, &peersid);
if (err)
return err;
if (peersid == SECSID_NULL) {
@@ -4315,12 +4349,18 @@ static void selinux_inet_csk_clone(struct sock *newsk,
selinux_netlbl_sk_security_reset(newsksec, req->rsk_ops->family);
}
-static void selinux_inet_conn_established(struct sock *sk,
- struct sk_buff *skb)
+static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb)
{
+ u16 family = sk->sk_family;
struct sk_security_struct *sksec = sk->sk_security;
- selinux_skb_peerlbl_sid(skb, sk->sk_family, &sksec->peer_sid);
+ /* handle mapped IPv4 packets arriving via IPv6 sockets */
+ if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
+ family = PF_INET;
+
+ selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid);
+
+ selinux_netlbl_inet_conn_established(sk, family);
}
static void selinux_req_classify_flow(const struct request_sock *req,
@@ -4370,39 +4410,54 @@ 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;
u8 secmark_active;
+ u8 netlbl_active;
u8 peerlbl_active;
if (!selinux_policycap_netpeer)
return NF_ACCEPT;
secmark_active = selinux_secmark_enabled();
- peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled();
+ netlbl_active = netlbl_enabled();
+ peerlbl_active = netlbl_active || selinux_xfrm_enabled();
if (!secmark_active && !peerlbl_active)
return NF_ACCEPT;
+ if (selinux_skb_peerlbl_sid(skb, family, &peer_sid) != 0)
+ return NF_DROP;
+
AVC_AUDIT_DATA_INIT(&ad, NET);
ad.u.net.netif = ifindex;
ad.u.net.family = family;
if (selinux_parse_skb(skb, &ad, &addrp, 1, NULL) != 0)
return NF_DROP;
- if (selinux_skb_peerlbl_sid(skb, family, &peer_sid) != 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,
SECCLASS_PACKET, PACKET__FORWARD_IN, &ad))
return NF_DROP;
+ if (netlbl_active)
+ /* we do this in the FORWARD path and not the POST_ROUTING
+ * path because we want to make sure we apply the necessary
+ * labeling before IPsec is applied so we can leverage AH
+ * protection */
+ if (selinux_netlbl_skbuff_setsid(skb, family, peer_sid) != 0)
+ return NF_DROP;
+
return NF_ACCEPT;
}
@@ -4426,6 +4481,37 @@ static unsigned int selinux_ipv6_forward(unsigned int hooknum,
}
#endif /* IPV6 */
+static unsigned int selinux_ip_output(struct sk_buff *skb,
+ u16 family)
+{
+ u32 sid;
+
+ if (!netlbl_enabled())
+ return NF_ACCEPT;
+
+ /* we do this in the LOCAL_OUT path and not the POST_ROUTING path
+ * because we want to make sure we apply the necessary labeling
+ * before IPsec is applied so we can leverage AH protection */
+ if (skb->sk) {
+ struct sk_security_struct *sksec = skb->sk->sk_security;
+ sid = sksec->sid;
+ } else
+ sid = SECINITSID_KERNEL;
+ if (selinux_netlbl_skbuff_setsid(skb, family, sid) != 0)
+ return NF_DROP;
+
+ return NF_ACCEPT;
+}
+
+static unsigned int selinux_ipv4_output(unsigned int hooknum,
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ return selinux_ip_output(skb, PF_INET);
+}
+
static int selinux_ip_postroute_iptables_compat(struct sock *sk,
int ifindex,
struct avc_audit_data *ad,
@@ -4493,30 +4579,36 @@ static int selinux_ip_postroute_iptables_compat(struct sock *sk,
static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb,
int ifindex,
- struct avc_audit_data *ad,
- u16 family,
- char *addrp,
- u8 proto)
+ u16 family)
{
struct sock *sk = skb->sk;
struct sk_security_struct *sksec;
+ struct avc_audit_data ad;
+ char *addrp;
+ u8 proto;
if (sk == NULL)
return NF_ACCEPT;
sksec = sk->sk_security;
+ AVC_AUDIT_DATA_INIT(&ad, NET);
+ ad.u.net.netif = ifindex;
+ ad.u.net.family = family;
+ if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto))
+ return NF_DROP;
+
if (selinux_compat_net) {
if (selinux_ip_postroute_iptables_compat(skb->sk, ifindex,
- ad, family, addrp))
+ &ad, family, addrp))
return NF_DROP;
} else {
if (avc_has_perm(sksec->sid, skb->secmark,
- SECCLASS_PACKET, PACKET__SEND, ad))
+ SECCLASS_PACKET, PACKET__SEND, &ad))
return NF_DROP;
}
if (selinux_policycap_netpeer)
- if (selinux_xfrm_postroute_last(sksec->sid, skb, ad, proto))
+ if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto))
return NF_DROP;
return NF_ACCEPT;
@@ -4530,23 +4622,15 @@ static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex,
struct sock *sk;
struct avc_audit_data ad;
char *addrp;
- u8 proto;
u8 secmark_active;
u8 peerlbl_active;
- AVC_AUDIT_DATA_INIT(&ad, NET);
- ad.u.net.netif = ifindex;
- ad.u.net.family = family;
- if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto))
- return NF_DROP;
-
/* If any sort of compatibility mode is enabled then handoff processing
* to the selinux_ip_postroute_compat() function to deal with the
* special handling. We do this in an attempt to keep this function
* as fast and as clean as possible. */
if (selinux_compat_net || !selinux_policycap_netpeer)
- return selinux_ip_postroute_compat(skb, ifindex, &ad,
- family, addrp, proto);
+ return selinux_ip_postroute_compat(skb, ifindex, family);
/* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec
* packet transformation so allow the packet to pass without any checks
@@ -4562,21 +4646,45 @@ static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex,
if (!secmark_active && !peerlbl_active)
return NF_ACCEPT;
- /* if the packet is locally generated (skb->sk != NULL) then use the
- * socket's label as the peer label, otherwise the packet is being
- * forwarded through this system and we need to fetch the peer label
- * directly from the packet */
+ /* if the packet is being forwarded then get the peer label from the
+ * packet itself; otherwise check to see if it is from a local
+ * application or the kernel, if from an application get the peer label
+ * from the sending socket, otherwise use the kernel's sid */
sk = skb->sk;
- if (sk) {
+ if (sk == NULL) {
+ switch (family) {
+ case PF_INET:
+ if (IPCB(skb)->flags & IPSKB_FORWARDED)
+ secmark_perm = PACKET__FORWARD_OUT;
+ else
+ secmark_perm = PACKET__SEND;
+ break;
+ case PF_INET6:
+ if (IP6CB(skb)->flags & IP6SKB_FORWARDED)
+ secmark_perm = PACKET__FORWARD_OUT;
+ else
+ secmark_perm = PACKET__SEND;
+ break;
+ default:
+ return NF_DROP;
+ }
+ if (secmark_perm == PACKET__FORWARD_OUT) {
+ if (selinux_skb_peerlbl_sid(skb, family, &peer_sid))
+ return NF_DROP;
+ } else
+ peer_sid = SECINITSID_KERNEL;
+ } else {
struct sk_security_struct *sksec = sk->sk_security;
peer_sid = sksec->sid;
secmark_perm = PACKET__SEND;
- } else {
- if (selinux_skb_peerlbl_sid(skb, family, &peer_sid))
- return NF_DROP;
- secmark_perm = PACKET__FORWARD_OUT;
}
+ AVC_AUDIT_DATA_INIT(&ad, NET);
+ ad.u.net.netif = ifindex;
+ ad.u.net.family = family;
+ if (selinux_parse_skb(skb, &ad, &addrp, 0, NULL))
+ return NF_DROP;
+
if (secmark_active)
if (avc_has_perm(peer_sid, skb->secmark,
SECCLASS_PACKET, secmark_perm, &ad))
@@ -5219,8 +5327,12 @@ static int selinux_setprocattr(struct task_struct *p,
if (sid == 0)
return -EINVAL;
-
- /* Only allow single threaded processes to change context */
+ /*
+ * SELinux allows to change context in the following case only.
+ * - Single threaded processes.
+ * - Multi threaded processes intend to change its context into
+ * more restricted domain (defined by TYPEBOUNDS statement).
+ */
if (atomic_read(&p->mm->mm_users) != 1) {
struct task_struct *g, *t;
struct mm_struct *mm = p->mm;
@@ -5228,11 +5340,16 @@ static int selinux_setprocattr(struct task_struct *p,
do_each_thread(g, t) {
if (t->mm == mm && t != p) {
read_unlock(&tasklist_lock);
- return -EPERM;
+ error = security_bounded_transition(tsec->sid, sid);
+ if (!error)
+ goto boundary_ok;
+
+ return error;
}
} while_each_thread(g, t);
read_unlock(&tasklist_lock);
}
+boundary_ok:
/* Check permissions for the transition. */
error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
@@ -5641,6 +5758,13 @@ static struct nf_hook_ops selinux_ipv4_ops[] = {
.pf = PF_INET,
.hooknum = NF_INET_FORWARD,
.priority = NF_IP_PRI_SELINUX_FIRST,
+ },
+ {
+ .hook = selinux_ipv4_output,
+ .owner = THIS_MODULE,
+ .pf = PF_INET,
+ .hooknum = NF_INET_LOCAL_OUT,
+ .priority = NF_IP_PRI_SELINUX_FIRST,
}
};
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-23 11:34:17 +0300