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/****************************************************************
* acm_policy.c
*
* Copyright (C) 2005 IBM Corporation
*
* Author:
* Reiner Sailer <sailer@watson.ibm.com>
*
* Contributions:
* Stefan Berger <stefanb@watson.ibm.com>
* support for network-byte-order binary policies
*
* 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 policy management for Xen.
* This interface allows policy tools in authorized
* domains to interact with the Xen access control module
*
*/
#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 <public/policy_ops.h>
#include <acm/acm_core.h>
#include <acm/acm_hooks.h>
#include <acm/acm_endian.h>
int
acm_set_policy(void *buf, u16 buf_size, u16 policy)
{
u8 *policy_buffer = NULL;
struct acm_policy_buffer *pol;
if (policy != ACM_USE_SECURITY_POLICY) {
printk("%s: Loading incompatible policy (running: %s).\n", __func__,
ACM_POLICY_NAME(ACM_USE_SECURITY_POLICY));
return -EFAULT;
}
/* now check correct buffer sizes for policy combinations */
if (policy == ACM_NULL_POLICY) {
printkd("%s: NULL Policy, no policy needed.\n", __func__);
goto out;
}
if (buf_size < sizeof(struct acm_policy_buffer))
return -EFAULT;
/* 1. copy buffer from domain */
if ((policy_buffer = xmalloc_array(u8, buf_size)) == NULL)
goto error_free;
if (copy_from_user(policy_buffer, buf, buf_size)) {
printk("%s: Error copying!\n",__func__);
goto error_free;
}
/* 2. some sanity checking */
pol = (struct acm_policy_buffer *)policy_buffer;
if ((ntohl(pol->magic) != ACM_MAGIC) ||
(ntohs(pol->primary_policy_code) != acm_bin_pol.primary_policy_code) ||
(ntohs(pol->secondary_policy_code) != acm_bin_pol.secondary_policy_code)) {
printkd("%s: Wrong policy magics!\n", __func__);
goto error_free;
}
if (buf_size != ntohl(pol->len)) {
printk("%s: ERROR in buf size.\n", __func__);
goto error_free;
}
/* get bin_policy lock and rewrite policy (release old one) */
write_lock(&acm_bin_pol_rwlock);
/* 3. now get/set primary policy data */
if (acm_primary_ops->set_binary_policy(buf + ntohs(pol->primary_buffer_offset),
ntohs(pol->secondary_buffer_offset) -
ntohs(pol->primary_buffer_offset))) {
goto error_lock_free;
}
/* 4. now get/set secondary policy data */
if (acm_secondary_ops->set_binary_policy(buf + ntohs(pol->secondary_buffer_offset),
ntohl(pol->len) -
ntohs(pol->secondary_buffer_offset))) {
goto error_lock_free;
}
write_unlock(&acm_bin_pol_rwlock);
out:
printk("%s: Done .\n", __func__);
if (policy_buffer != NULL)
xfree(policy_buffer);
return ACM_OK;
error_lock_free:
write_unlock(&acm_bin_pol_rwlock);
error_free:
printk("%s: Error setting policy.\n", __func__);
if (policy_buffer != NULL)
xfree(policy_buffer);
return -ENOMEM;
}
int
acm_get_policy(void *buf, u16 buf_size)
{
u8 *policy_buffer;
int ret;
struct acm_policy_buffer *bin_pol;
if ((policy_buffer = xmalloc_array(u8, buf_size)) == NULL)
return -ENOMEM;
read_lock(&acm_bin_pol_rwlock);
/* future: read policy from file and set it */
bin_pol = (struct acm_policy_buffer *)policy_buffer;
bin_pol->magic = htonl(ACM_MAGIC);
bin_pol->policyversion = htonl(POLICY_INTERFACE_VERSION);
bin_pol->primary_policy_code = htons(acm_bin_pol.primary_policy_code);
bin_pol->secondary_policy_code = htons(acm_bin_pol.secondary_policy_code);
bin_pol->len = htonl(sizeof(struct acm_policy_buffer));
bin_pol->primary_buffer_offset = htons(ntohl(bin_pol->len));
bin_pol->secondary_buffer_offset = htons(ntohl(bin_pol->len));
ret = acm_primary_ops->dump_binary_policy (policy_buffer + ntohs(bin_pol->primary_buffer_offset),
buf_size - ntohs(bin_pol->primary_buffer_offset));
if (ret < 0) {
printk("%s: ERROR creating chwallpolicy buffer.\n", __func__);
read_unlock(&acm_bin_pol_rwlock);
return -1;
}
bin_pol->len = htonl(ntohl(bin_pol->len) + ret);
bin_pol->secondary_buffer_offset = htons(ntohl(bin_pol->len));
ret = acm_secondary_ops->dump_binary_policy(policy_buffer + ntohs(bin_pol->secondary_buffer_offset),
buf_size - ntohs(bin_pol->secondary_buffer_offset));
if (ret < 0) {
printk("%s: ERROR creating chwallpolicy buffer.\n", __func__);
read_unlock(&acm_bin_pol_rwlock);
return -1;
}
bin_pol->len = htonl(ntohl(bin_pol->len) + ret);
read_unlock(&acm_bin_pol_rwlock);
if (copy_to_user(buf, policy_buffer, ntohl(bin_pol->len)))
return -EFAULT;
xfree(policy_buffer);
return ACM_OK;
}
int
acm_dump_statistics(void *buf, u16 buf_size)
{
/* send stats to user space */
u8 *stats_buffer;
int len1, len2;
struct acm_stats_buffer acm_stats;
if ((stats_buffer = xmalloc_array(u8, buf_size)) == NULL)
return -ENOMEM;
read_lock(&acm_bin_pol_rwlock);
len1 = acm_primary_ops->dump_statistics(stats_buffer + sizeof(struct acm_stats_buffer),
buf_size - sizeof(struct acm_stats_buffer));
if (len1 < 0)
goto error_lock_free;
len2 = acm_secondary_ops->dump_statistics(stats_buffer + sizeof(struct acm_stats_buffer) + len1,
buf_size - sizeof(struct acm_stats_buffer) - len1);
if (len2 < 0)
goto error_lock_free;
acm_stats.magic = htonl(ACM_MAGIC);
acm_stats.policyversion = htonl(POLICY_INTERFACE_VERSION);
acm_stats.primary_policy_code = htons(acm_bin_pol.primary_policy_code);
acm_stats.secondary_policy_code = htons(acm_bin_pol.secondary_policy_code);
acm_stats.primary_stats_offset = htons(sizeof(struct acm_stats_buffer));
acm_stats.secondary_stats_offset = htons(sizeof(struct acm_stats_buffer) + len1);
acm_stats.len = htonl(sizeof(struct acm_stats_buffer) + len1 + len2);
memcpy(stats_buffer, &acm_stats, sizeof(struct acm_stats_buffer));
if (copy_to_user(buf, stats_buffer, sizeof(struct acm_stats_buffer) + len1 + len2))
goto error_lock_free;
read_unlock(&acm_bin_pol_rwlock);
xfree(stats_buffer);
return ACM_OK;
error_lock_free:
read_unlock(&acm_bin_pol_rwlock);
xfree(stats_buffer);
return -EFAULT;
}
/*eof*/
|
