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selinux: Implement Infiniband PKey "Access" access vector

Browse source 
Add a type and access vector for PKeys. Implement the ib_pkey_access
hook to check that the caller has permission to access the PKey on the
given subnet prefix. Add an interface to get the PKey SID. Walk the PKey
ocontexts to find an entry for the given subnet prefix and pkey.

Signed-off-by: Daniel Jurgens <[email protected]>
Reviewed-by: James Morris <[email protected]>
Acked-by: Doug Ledford <[email protected]>
Signed-off-by: Paul Moore <[email protected]>
This commit is contained in:
Daniel Jurgens 2017-05-19 15:48:57 +03:00 • committed by Paul Moore
commit cfc4d882d4
6 changed files with 84 additions and 0 deletions
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22
security/selinux/hooks.c
View file

@ -6148,6 +6148,27 @@ static int selinux_key_getsecurity(struct key *key, char **_buffer)
#endif
#ifdef CONFIG_SECURITY_INFINIBAND
static int selinux_ib_pkey_access(void *ib_sec, u64 subnet_prefix, u16 pkey_val)
{
struct common_audit_data ad;
int err;
u32 sid = 0;
struct ib_security_struct *sec = ib_sec;
struct lsm_ibpkey_audit ibpkey;
err = security_ib_pkey_sid(subnet_prefix, pkey_val, &sid);
if (err)
return err;
ad.type = LSM_AUDIT_DATA_IBPKEY;
ibpkey.subnet_prefix = subnet_prefix;
ibpkey.pkey = pkey_val;
ad.u.ibpkey = &ibpkey;
return avc_has_perm(sec->sid, sid,
SECCLASS_INFINIBAND_PKEY,
INFINIBAND_PKEY__ACCESS, &ad);
}
static int selinux_ib_alloc_security(void **ib_sec)
{
struct ib_security_struct *sec;
@ -6352,6 +6373,7 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(tun_dev_attach, selinux_tun_dev_attach),
LSM_HOOK_INIT(tun_dev_open, selinux_tun_dev_open),
#ifdef CONFIG_SECURITY_INFINIBAND
LSM_HOOK_INIT(ib_pkey_access, selinux_ib_pkey_access),
LSM_HOOK_INIT(ib_alloc_security, selinux_ib_alloc_security),
LSM_HOOK_INIT(ib_free_security, selinux_ib_free_security),
#endif

2
security/selinux/include/classmap.h
View file

@ -231,6 +231,8 @@ struct security_class_mapping secclass_map[] = {
{ COMMON_SOCK_PERMS, NULL } },
{ "smc_socket",
{ COMMON_SOCK_PERMS, NULL } },
{ "infiniband_pkey",
{ "access", NULL } },
{ NULL }
};

2
security/selinux/include/security.h
View file

@ -181,6 +181,8 @@ int security_get_user_sids(u32 callsid, char *username,
int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
int security_netif_sid(char *name, u32 *if_sid);
int security_node_sid(u16 domain, void *addr, u32 addrlen,

40
security/selinux/ss/services.c
View file

@ -2232,6 +2232,46 @@ out:
return rc;
}
/**
* security_pkey_sid - Obtain the SID for a pkey.
* @subnet_prefix: Subnet Prefix
* @pkey_num: pkey number
* @out_sid: security identifier
*/
int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid)
{
struct ocontext *c;
int rc = 0;
read_lock(&policy_rwlock);
c = policydb.ocontexts[OCON_IBPKEY];
while (c) {
if (c->u.ibpkey.low_pkey <= pkey_num &&
c->u.ibpkey.high_pkey >= pkey_num &&
c->u.ibpkey.subnet_prefix == subnet_prefix)
break;
c = c->next;
}
if (c) {
if (!c->sid[0]) {
rc = sidtab_context_to_sid(&sidtab,
&c->context[0],
&c->sid[0]);
if (rc)
goto out;
}
*out_sid = c->sid[0];
} else
*out_sid = SECINITSID_UNLABELED;
out:
read_unlock(&policy_rwlock);
return rc;
}
/**
* security_netif_sid - Obtain the SID for a network interface.
* @name: interface name