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/****************************************************************
* acm_core.c
*
* Copyright (C) 2005 IBM Corporation
*
* Author:
* Reiner Sailer <sailer@watson.ibm.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2 of the
* License.
*
* sHype access control module (ACM)
* This file handles initialization of the ACM
* as well as initializing/freeing security
* identifiers for domains (it calls on active
* policy hook functions).
*
*/
#include <xen/config.h>
#include <xen/errno.h>
#include <xen/types.h>
#include <xen/lib.h>
#include <xen/delay.h>
#include <xen/sched.h>
#include <acm/acm_hooks.h>
#include <acm/acm_endian.h>
/* debug:
* include/acm/acm_hooks.h defines a constant ACM_TRACE_MODE;
* define/undefine this constant to receive / suppress any
* security hook debug output of sHype
*
* include/public/acm.h defines a constant ACM_DEBUG
* define/undefine this constant to receive non-hook-related
* debug output.
*/
/* function prototypes */
void acm_init_chwall_policy(void);
void acm_init_ste_policy(void);
extern struct acm_operations acm_chinesewall_ops,
acm_simple_type_enforcement_ops, acm_null_ops;
/* global ops structs called by the hooks */
struct acm_operations *acm_primary_ops = NULL;
/* called in hook if-and-only-if primary succeeds */
struct acm_operations *acm_secondary_ops = NULL;
/* acm global binary policy (points to 'local' primary and secondary policies */
struct acm_binary_policy acm_bin_pol;
/* acm binary policy lock */
rwlock_t acm_bin_pol_rwlock = RW_LOCK_UNLOCKED;
/* until we have endian support in Xen, we discover it at runtime */
u8 little_endian = 1;
void acm_set_endian(void)
{
u32 test = 1;
if (*((u8 *)&test) == 1) {
printk("ACM module running in LITTLE ENDIAN.\n");
little_endian = 1;
} else {
printk("ACM module running in BIG ENDIAN.\n");
little_endian = 0;
}
}
/* initialize global security policy for Xen; policy write-locked already */
static void
acm_init_binary_policy(void *primary, void *secondary)
{
acm_bin_pol.primary_policy_code = 0;
acm_bin_pol.secondary_policy_code = 0;
acm_bin_pol.primary_binary_policy = primary;
acm_bin_pol.secondary_binary_policy = secondary;
}
int
acm_init(void)
{
int ret = -EINVAL;
acm_set_endian();
write_lock(&acm_bin_pol_rwlock);
if (ACM_USE_SECURITY_POLICY == ACM_CHINESE_WALL_POLICY) {
acm_init_binary_policy(NULL, NULL);
acm_init_chwall_policy();
acm_bin_pol.primary_policy_code = ACM_CHINESE_WALL_POLICY;
acm_primary_ops = &acm_chinesewall_ops;
acm_bin_pol.secondary_policy_code = ACM_NULL_POLICY;
acm_secondary_ops = &acm_null_ops;
ret = ACM_OK;
} else if (ACM_USE_SECURITY_POLICY == ACM_SIMPLE_TYPE_ENFORCEMENT_POLICY) {
acm_init_binary_policy(NULL, NULL);
acm_init_ste_policy();
acm_bin_pol.primary_policy_code = ACM_SIMPLE_TYPE_ENFORCEMENT_POLICY;
acm_primary_ops = &acm_simple_type_enforcement_ops;
acm_bin_pol.secondary_policy_code = ACM_NULL_POLICY;
acm_secondary_ops = &acm_null_ops;
ret = ACM_OK;
} else if (ACM_USE_SECURITY_POLICY == ACM_CHINESE_WALL_AND_SIMPLE_TYPE_ENFORCEMENT_POLICY) {
acm_init_binary_policy(NULL, NULL);
acm_init_chwall_policy();
acm_init_ste_policy();
acm_bin_pol.primary_policy_code = ACM_CHINESE_WALL_POLICY;
acm_primary_ops = &acm_chinesewall_ops;
acm_bin_pol.secondary_policy_code = ACM_SIMPLE_TYPE_ENFORCEMENT_POLICY;
acm_secondary_ops = &acm_simple_type_enforcement_ops;
ret = ACM_OK;
} else if (ACM_USE_SECURITY_POLICY == ACM_NULL_POLICY) {
acm_init_binary_policy(NULL, NULL);
acm_bin_pol.primary_policy_code = ACM_NULL_POLICY;
acm_primary_ops = &acm_null_ops;
acm_bin_pol.secondary_policy_code = ACM_NULL_POLICY;
acm_secondary_ops = &acm_null_ops;
ret = ACM_OK;
}
write_unlock(&acm_bin_pol_rwlock);
if (ret != ACM_OK)
return -EINVAL;
printk("%s: Enforcing Primary %s, Secondary %s.\n", __func__,
ACM_POLICY_NAME(acm_bin_pol.primary_policy_code), ACM_POLICY_NAME(acm_bin_pol.secondary_policy_code));
return ACM_OK;
}
int
acm_init_domain_ssid(domid_t id, ssidref_t ssidref)
{
struct acm_ssid_domain *ssid;
struct domain *subj = find_domain_by_id(id);
int ret1, ret2;
if (subj == NULL) {
printk("%s: ACM_NULL_POINTER ERROR (id=%x).\n", __func__, id);
return ACM_NULL_POINTER_ERROR;
}
if ((ssid = xmalloc(struct acm_ssid_domain)) == NULL)
return ACM_INIT_SSID_ERROR;
ssid->datatype = DOMAIN;
ssid->subject = subj;
ssid->domainid = subj->domain_id;
ssid->primary_ssid = NULL;
ssid->secondary_ssid = NULL;
if (ACM_USE_SECURITY_POLICY != ACM_NULL_POLICY)
ssid->ssidref = ssidref;
else
ssid->ssidref = ACM_DEFAULT_SSID;
subj->ssid = ssid;
/* now fill in primary and secondary parts; we only get here through hooks */
if (acm_primary_ops->init_domain_ssid != NULL)
ret1 = acm_primary_ops->init_domain_ssid(&(ssid->primary_ssid), ssidref);
else
ret1 = ACM_OK;
if (acm_secondary_ops->init_domain_ssid != NULL)
ret2 = acm_secondary_ops->init_domain_ssid(&(ssid->secondary_ssid), ssidref);
else
ret2 = ACM_OK;
if ((ret1 != ACM_OK) || (ret2 != ACM_OK)) {
printk("%s: ERROR instantiating individual ssids for domain 0x%02x.\n",
__func__, subj->domain_id);
acm_free_domain_ssid(ssid);
put_domain(subj);
return ACM_INIT_SSID_ERROR;
}
printk("%s: assigned domain %x the ssidref=%x.\n", __func__, id, ssid->ssidref);
put_domain(subj);
return ACM_OK;
}
int
acm_free_domain_ssid(struct acm_ssid_domain *ssid)
{
domid_t id;
/* domain is already gone, just ssid is left */
if (ssid == NULL) {
printk("%s: ACM_NULL_POINTER ERROR.\n", __func__);
return ACM_NULL_POINTER_ERROR;
}
id = ssid->domainid;
ssid->subject = NULL;
if (acm_primary_ops->free_domain_ssid != NULL) /* null policy */
acm_primary_ops->free_domain_ssid(ssid->primary_ssid);
ssid->primary_ssid = NULL;
if (acm_secondary_ops->free_domain_ssid != NULL)
acm_secondary_ops->free_domain_ssid(ssid->secondary_ssid);
ssid->secondary_ssid = NULL;
xfree(ssid);
printkd("%s: Freed individual domain ssid (domain=%02x).\n",__func__, id);
return ACM_OK;
}
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