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Merge branch 'next' of git://git.infradead.org/users/pcmoore/selinux into next

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This commit is contained in:
James Morris 2014-10-01 00:45:26 +10:00
commit 858f61c429
5 changed files with 115 additions and 83 deletions
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135
security/selinux/hooks.c
View File

@ -2097,6 +2097,41 @@ static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
/* binprm security operations */
static int check_nnp_nosuid(const struct linux_binprm *bprm,
const struct task_security_struct *old_tsec,
const struct task_security_struct *new_tsec)
{
int nnp = (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS);
int nosuid = (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID);
int rc;
if (!nnp && !nosuid)
return 0; /* neither NNP nor nosuid */
if (new_tsec->sid == old_tsec->sid)
return 0; /* No change in credentials */
/*
* The only transitions we permit under NNP or nosuid
* are transitions to bounded SIDs, i.e. SIDs that are
* guaranteed to only be allowed a subset of the permissions
* of the current SID.
*/
rc = security_bounded_transition(old_tsec->sid, new_tsec->sid);
if (rc) {
/*
* On failure, preserve the errno values for NNP vs nosuid.
* NNP: Operation not permitted for caller.
* nosuid: Permission denied to file.
*/
if (nnp)
return -EPERM;
else
return -EACCES;
}
return 0;
}
static int selinux_bprm_set_creds(struct linux_binprm *bprm)
{
const struct task_security_struct *old_tsec;
@ -2133,14 +2168,10 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm)
/* Reset exec SID on execve. */
new_tsec->exec_sid = 0;
/*
* Minimize confusion: if no_new_privs or nosuid and a
* transition is explicitly requested, then fail the exec.
*/
if (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS)
return -EPERM;
if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID)
return -EACCES;
/* Fail on NNP or nosuid if not an allowed transition. */
rc = check_nnp_nosuid(bprm, old_tsec, new_tsec);
if (rc)
return rc;
} else {
/* Check for a default transition on this program. */
rc = security_transition_sid(old_tsec->sid, isec->sid,
@ -2148,15 +2179,19 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm)
&new_tsec->sid);
if (rc)
return rc;
/*
* Fallback to old SID on NNP or nosuid if not an allowed
* transition.
*/
rc = check_nnp_nosuid(bprm, old_tsec, new_tsec);
if (rc)
new_tsec->sid = old_tsec->sid;
}
ad.type = LSM_AUDIT_DATA_PATH;
ad.u.path = bprm->file->f_path;
if ((bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) ||
(bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS))
new_tsec->sid = old_tsec->sid;
if (new_tsec->sid == old_tsec->sid) {
rc = avc_has_perm(old_tsec->sid, isec->sid,
SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad);
@ -4272,15 +4307,15 @@ static int selinux_socket_unix_may_send(struct socket *sock,
&ad);
}
static int selinux_inet_sys_rcv_skb(int ifindex, char *addrp, u16 family,
u32 peer_sid,
static int selinux_inet_sys_rcv_skb(struct net *ns, int ifindex,
char *addrp, u16 family, u32 peer_sid,
struct common_audit_data *ad)
{
int err;
u32 if_sid;
u32 node_sid;
err = sel_netif_sid(ifindex, &if_sid);
err = sel_netif_sid(ns, ifindex, &if_sid);
if (err)
return err;
err = avc_has_perm(peer_sid, if_sid,
@ -4373,8 +4408,8 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
if (err)
return err;
err = selinux_inet_sys_rcv_skb(skb->skb_iif, addrp, family,
peer_sid, &ad);
err = selinux_inet_sys_rcv_skb(sock_net(sk), skb->skb_iif,
addrp, family, peer_sid, &ad);
if (err) {
selinux_netlbl_err(skb, err, 0);
return err;
@ -4692,10 +4727,9 @@ static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
err = selinux_nlmsg_lookup(sksec->sclass, nlh->nlmsg_type, &perm);
if (err) {
if (err == -EINVAL) {
audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR,
"SELinux: unrecognized netlink message"
" type=%hu for sclass=%hu\n",
nlh->nlmsg_type, sksec->sclass);
WARN_ONCE(1, "selinux_nlmsg_perm: unrecognized netlink message:"
" protocol=%hu nlmsg_type=%hu sclass=%hu\n",
sk->sk_protocol, nlh->nlmsg_type, sksec->sclass);
if (!selinux_enforcing || security_get_allow_unknown())
err = 0;
}
@ -4713,7 +4747,8 @@ out:
#ifdef CONFIG_NETFILTER
static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex,
static unsigned int selinux_ip_forward(struct sk_buff *skb,
const struct net_device *indev,
u16 family)
{
int err;
@ -4739,14 +4774,14 @@ static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex,
ad.type = LSM_AUDIT_DATA_NET;
ad.u.net = &net;
ad.u.net->netif = ifindex;
ad.u.net->netif = indev->ifindex;
ad.u.net->family = family;
if (selinux_parse_skb(skb, &ad, &addrp, 1, NULL) != 0)
return NF_DROP;
if (peerlbl_active) {
err = selinux_inet_sys_rcv_skb(ifindex, addrp, family,
peer_sid, &ad);
err = selinux_inet_sys_rcv_skb(dev_net(indev), indev->ifindex,
addrp, family, peer_sid, &ad);
if (err) {
selinux_netlbl_err(skb, err, 1);
return NF_DROP;
@ -4775,7 +4810,7 @@ static unsigned int selinux_ipv4_forward(const struct nf_hook_ops *ops,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
return selinux_ip_forward(skb, in->ifindex, PF_INET);
return selinux_ip_forward(skb, in, PF_INET);
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
@ -4785,7 +4820,7 @@ static unsigned int selinux_ipv6_forward(const struct nf_hook_ops *ops,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
return selinux_ip_forward(skb, in->ifindex, PF_INET6);
return selinux_ip_forward(skb, in, PF_INET6);
}
#endif /* IPV6 */
@ -4873,11 +4908,13 @@ static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb,
return NF_ACCEPT;
}
static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex,
static unsigned int selinux_ip_postroute(struct sk_buff *skb,
const struct net_device *outdev,
u16 family)
{
u32 secmark_perm;
u32 peer_sid;
int ifindex = outdev->ifindex;
struct sock *sk;
struct common_audit_data ad;
struct lsm_network_audit net = {0,};
@ -4958,6 +4995,7 @@ static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex,
case PF_INET6:
if (IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED)
return NF_ACCEPT;
break;
default:
return NF_DROP_ERR(-ECONNREFUSED);
}
@ -4989,7 +5027,7 @@ static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex,
u32 if_sid;
u32 node_sid;
if (sel_netif_sid(ifindex, &if_sid))
if (sel_netif_sid(dev_net(outdev), ifindex, &if_sid))
return NF_DROP;
if (avc_has_perm(peer_sid, if_sid,
SECCLASS_NETIF, NETIF__EGRESS, &ad))
@ -5011,7 +5049,7 @@ static unsigned int selinux_ipv4_postroute(const struct nf_hook_ops *ops,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
return selinux_ip_postroute(skb, out->ifindex, PF_INET);
return selinux_ip_postroute(skb, out, PF_INET);
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
@ -5021,7 +5059,7 @@ static unsigned int selinux_ipv6_postroute(const struct nf_hook_ops *ops,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
return selinux_ip_postroute(skb, out->ifindex, PF_INET6);
return selinux_ip_postroute(skb, out, PF_INET6);
}
#endif /* IPV6 */
@ -6035,7 +6073,7 @@ security_initcall(selinux_init);
#if defined(CONFIG_NETFILTER)
static struct nf_hook_ops selinux_ipv4_ops[] = {
static struct nf_hook_ops selinux_nf_ops[] = {
{
.hook = selinux_ipv4_postroute,
.owner = THIS_MODULE,
@ -6056,12 +6094,8 @@ static struct nf_hook_ops selinux_ipv4_ops[] = {
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP_PRI_SELINUX_FIRST,
}
};
},
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
static struct nf_hook_ops selinux_ipv6_ops[] = {
{
.hook = selinux_ipv6_postroute,
.owner = THIS_MODULE,
@ -6075,32 +6109,24 @@ static struct nf_hook_ops selinux_ipv6_ops[] = {
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_FORWARD,
.priority = NF_IP6_PRI_SELINUX_FIRST,
}
};
},
#endif /* IPV6 */
};
static int __init selinux_nf_ip_init(void)
{
int err = 0;
int err;
if (!selinux_enabled)
goto out;
return 0;
printk(KERN_DEBUG "SELinux: Registering netfilter hooks\n");
err = nf_register_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops));
err = nf_register_hooks(selinux_nf_ops, ARRAY_SIZE(selinux_nf_ops));
if (err)
panic("SELinux: nf_register_hooks for IPv4: error %d\n", err);
panic("SELinux: nf_register_hooks: error %d\n", err);
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
err = nf_register_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops));
if (err)
panic("SELinux: nf_register_hooks for IPv6: error %d\n", err);
#endif /* IPV6 */
out:
return err;
return 0;
}
__initcall(selinux_nf_ip_init);
@ -6110,10 +6136,7 @@ static void selinux_nf_ip_exit(void)
{
printk(KERN_DEBUG "SELinux: Unregistering netfilter hooks\n");
nf_unregister_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops));
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
nf_unregister_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops));
#endif /* IPV6 */
nf_unregister_hooks(selinux_nf_ops, ARRAY_SIZE(selinux_nf_ops));
}
#endif

4
security/selinux/include/netif.h
View File

@ -17,9 +17,11 @@
#ifndef _SELINUX_NETIF_H_
#define _SELINUX_NETIF_H_
#include <net/net_namespace.h>
void sel_netif_flush(void);
int sel_netif_sid(int ifindex, u32 *sid);
int sel_netif_sid(struct net *ns, int ifindex, u32 *sid);
#endif /* _SELINUX_NETIF_H_ */

2
security/selinux/include/objsec.h
View File

@ -24,6 +24,7 @@
#include <linux/binfmts.h>
#include <linux/in.h>
#include <linux/spinlock.h>
#include <net/net_namespace.h>
#include "flask.h"
#include "avc.h"
@ -78,6 +79,7 @@ struct ipc_security_struct {
};
struct netif_security_struct {
struct net *ns; /* network namespace */
int ifindex; /* device index */
u32 sid; /* SID for this interface */
};

43
security/selinux/netif.c
View File

@ -45,6 +45,7 @@ static struct list_head sel_netif_hash[SEL_NETIF_HASH_SIZE];
/**
* sel_netif_hashfn - Hashing function for the interface table
* @ns: the network namespace
* @ifindex: the network interface
*
* Description:
@ -52,13 +53,14 @@ static struct list_head sel_netif_hash[SEL_NETIF_HASH_SIZE];
* bucket number for the given interface.
*
*/
static inline u32 sel_netif_hashfn(int ifindex)
static inline u32 sel_netif_hashfn(const struct net *ns, int ifindex)
{
return (ifindex & (SEL_NETIF_HASH_SIZE - 1));
return (((uintptr_t)ns + ifindex) & (SEL_NETIF_HASH_SIZE - 1));
}
/**
* sel_netif_find - Search for an interface record
* @ns: the network namespace
* @ifindex: the network interface
*
* Description:
@ -66,15 +68,15 @@ static inline u32 sel_netif_hashfn(int ifindex)
* If an entry can not be found in the table return NULL.
*
*/
static inline struct sel_netif *sel_netif_find(int ifindex)
static inline struct sel_netif *sel_netif_find(const struct net *ns,
int ifindex)
{
int idx = sel_netif_hashfn(ifindex);
int idx = sel_netif_hashfn(ns, ifindex);
struct sel_netif *netif;
list_for_each_entry_rcu(netif, &sel_netif_hash[idx], list)
/* all of the devices should normally fit in the hash, so we
* optimize for that case */
if (likely(netif->nsec.ifindex == ifindex))
if (net_eq(netif->nsec.ns, ns) &&
netif->nsec.ifindex == ifindex)
return netif;
return NULL;
@ -96,7 +98,7 @@ static int sel_netif_insert(struct sel_netif *netif)
if (sel_netif_total >= SEL_NETIF_HASH_MAX)
return -ENOSPC;
idx = sel_netif_hashfn(netif->nsec.ifindex);
idx = sel_netif_hashfn(netif->nsec.ns, netif->nsec.ifindex);
list_add_rcu(&netif->list, &sel_netif_hash[idx]);
sel_netif_total++;
@ -120,6 +122,7 @@ static void sel_netif_destroy(struct sel_netif *netif)
/**
* sel_netif_sid_slow - Lookup the SID of a network interface using the policy
* @ns: the network namespace
* @ifindex: the network interface
* @sid: interface SID
*
@ -130,7 +133,7 @@ static void sel_netif_destroy(struct sel_netif *netif)
* failure.
*
*/
static int sel_netif_sid_slow(int ifindex, u32 *sid)
static int sel_netif_sid_slow(struct net *ns, int ifindex, u32 *sid)
{
int ret;
struct sel_netif *netif;
@ -140,7 +143,7 @@ static int sel_netif_sid_slow(int ifindex, u32 *sid)
/* NOTE: we always use init's network namespace since we don't
* currently support containers */
dev = dev_get_by_index(&init_net, ifindex);
dev = dev_get_by_index(ns, ifindex);
if (unlikely(dev == NULL)) {
printk(KERN_WARNING
"SELinux: failure in sel_netif_sid_slow(),"
@ -149,7 +152,7 @@ static int sel_netif_sid_slow(int ifindex, u32 *sid)
}
spin_lock_bh(&sel_netif_lock);
netif = sel_netif_find(ifindex);
netif = sel_netif_find(ns, ifindex);
if (netif != NULL) {
*sid = netif->nsec.sid;
ret = 0;
@ -163,6 +166,7 @@ static int sel_netif_sid_slow(int ifindex, u32 *sid)
ret = security_netif_sid(dev->name, &new->nsec.sid);
if (ret != 0)
goto out;
new->nsec.ns = ns;
new->nsec.ifindex = ifindex;
ret = sel_netif_insert(new);
if (ret != 0)
@ -184,6 +188,7 @@ out:
/**
* sel_netif_sid - Lookup the SID of a network interface
* @ns: the network namespace
* @ifindex: the network interface
* @sid: interface SID
*
@ -195,12 +200,12 @@ out:
* on failure.
*
*/
int sel_netif_sid(int ifindex, u32 *sid)
int sel_netif_sid(struct net *ns, int ifindex, u32 *sid)
{
struct sel_netif *netif;
rcu_read_lock();
netif = sel_netif_find(ifindex);
netif = sel_netif_find(ns, ifindex);
if (likely(netif != NULL)) {
*sid = netif->nsec.sid;
rcu_read_unlock();
@ -208,11 +213,12 @@ int sel_netif_sid(int ifindex, u32 *sid)
}
rcu_read_unlock();
return sel_netif_sid_slow(ifindex, sid);
return sel_netif_sid_slow(ns, ifindex, sid);
}
/**
* sel_netif_kill - Remove an entry from the network interface table
* @ns: the network namespace
* @ifindex: the network interface
*
* Description:
@ -220,13 +226,13 @@ int sel_netif_sid(int ifindex, u32 *sid)
* table if it exists.
*
*/
static void sel_netif_kill(int ifindex)
static void sel_netif_kill(const struct net *ns, int ifindex)
{
struct sel_netif *netif;
rcu_read_lock();
spin_lock_bh(&sel_netif_lock);
netif = sel_netif_find(ifindex);
netif = sel_netif_find(ns, ifindex);
if (netif)
sel_netif_destroy(netif);
spin_unlock_bh(&sel_netif_lock);
@ -257,11 +263,8 @@ static int sel_netif_netdev_notifier_handler(struct notifier_block *this,
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
if (dev_net(dev) != &init_net)
return NOTIFY_DONE;
if (event == NETDEV_DOWN)
sel_netif_kill(dev->ifindex);
sel_netif_kill(dev_net(dev), dev->ifindex);
return NOTIFY_DONE;
}

14
security/selinux/ss/services.c
View File

@ -728,7 +728,7 @@ static int security_validtrans_handle_fail(struct context *ocontext,
if (context_struct_to_string(tcontext, &t, &tlen))
goto out;
audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
"security_validate_transition: denied for"
"op=security_validate_transition seresult=denied"
" oldcontext=%s newcontext=%s taskcontext=%s tclass=%s",
o, n, t, sym_name(&policydb, SYM_CLASSES, tclass-1));
out:
@ -877,7 +877,7 @@ int security_bounded_transition(u32 old_sid, u32 new_sid)
audit_log(current->audit_context,
GFP_ATOMIC, AUDIT_SELINUX_ERR,
"op=security_bounded_transition "
"result=denied "
"seresult=denied "
"oldcontext=%s newcontext=%s",
old_name, new_name);
}
@ -1351,8 +1351,8 @@ static int compute_sid_handle_invalid_context(
if (context_struct_to_string(newcontext, &n, &nlen))
goto out;
audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
"security_compute_sid: invalid context %s"
" for scontext=%s"
"op=security_compute_sid invalid_context=%s"
" scontext=%s"
" tcontext=%s"
" tclass=%s",
n, s, t, sym_name(&policydb, SYM_CLASSES, tclass-1));
@ -2607,8 +2607,10 @@ int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid)
rc = convert_context_handle_invalid_context(&newcon);
if (rc) {
if (!context_struct_to_string(&newcon, &s, &len)) {
audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
"security_sid_mls_copy: invalid context %s", s);
audit_log(current->audit_context,
GFP_ATOMIC, AUDIT_SELINUX_ERR,
"op=security_sid_mls_copy "
"invalid_context=%s", s);
kfree(s);
}
goto out_unlock;