static ssize_t sel_write_load(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
ssize_t length;
void *data = NULL;
mutex_lock(&sel_mutex);
length = task_has_security(current, SECURITY__LOAD_POLICY);
if (length)
goto out;
/* No partial writes. */
length = -EINVAL;
if (*ppos != 0)
goto out;
length = -EFBIG;
if (count > 64 * 1024 * 1024)
goto out;
length = -ENOMEM;
data = vmalloc(count);
if (!data)
goto out;
length = -EFAULT;
if (copy_from_user(data, buf, count) != 0)
goto out;
length = security_load_policy(data, count);
if (length)
goto out;
length = sel_make_bools();
if (length)
goto out1;
length = sel_make_classes();
if (length)
goto out1;
length = sel_make_policycap();
if (length)
goto out1;
length = count;
out1:
audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
"policy loaded auid=%u ses=%u",
audit_get_loginuid(current),
audit_get_sessionid(current));
out:
mutex_unlock(&sel_mutex);
vfree(data);
return length;
}
static int flask_security_load(struct xen_flask_load *load)
{
int ret;
void *buf = NULL;
bool is_reload = ss_initialized;
ret = domain_has_security(current->domain, SECURITY__LOAD_POLICY);
if ( ret )
return ret;
if ( load->size > MAX_POLICY_SIZE )
return -EINVAL;
buf = xmalloc_bytes(load->size);
if ( !buf )
return -ENOMEM;
if ( _copy_from_guest(buf, load->buffer, load->size) )
{
ret = -EFAULT;
goto out_free;
}
spin_lock(&sel_sem);
ret = security_load_policy(buf, load->size);
if ( ret )
goto out;
if ( !is_reload )
printk(XENLOG_INFO "Flask: Policy loaded, continuing in %s mode.\n",
flask_enforcing ? "enforcing" : "permissive");
xfree(bool_pending_values);
bool_pending_values = NULL;
ret = 0;
out:
spin_unlock(&sel_sem);
out_free:
xfree(buf);
return ret;
}
int selinux_mkload_policy(int preservebools)
{
int kernvers = security_policyvers();
int maxvers = kernvers, minvers = DEFAULT_POLICY_VERSION, vers;
int setlocaldefs = load_setlocaldefs;
char path[PATH_MAX];
struct stat sb;
struct utsname uts;
size_t size;
void *map, *data;
int fd, rc = -1, prot;
sepol_policydb_t *policydb;
sepol_policy_file_t *pf;
int usesepol = 0;
int (*vers_max)(void) = NULL;
int (*vers_min)(void) = NULL;
int (*policy_file_create)(sepol_policy_file_t **) = NULL;
void (*policy_file_free)(sepol_policy_file_t *) = NULL;
void (*policy_file_set_mem)(sepol_policy_file_t *, char*, size_t) = NULL;
int (*policydb_create)(sepol_policydb_t **) = NULL;
void (*policydb_free)(sepol_policydb_t *) = NULL;
int (*policydb_read)(sepol_policydb_t *, sepol_policy_file_t *) = NULL;
int (*policydb_set_vers)(sepol_policydb_t *, unsigned int) = NULL;
int (*policydb_to_image)(sepol_handle_t *, sepol_policydb_t *, void **, size_t *) = NULL;
int (*genbools_array)(void *data, size_t len, char **names, int *values, int nel) = NULL;
int (*genusers)(void *data, size_t len, const char *usersdir, void **newdata, size_t * newlen) = NULL;
int (*genbools)(void *data, size_t len, char *boolpath) = NULL;
#ifdef SHARED
char *errormsg = NULL;
void *libsepolh = NULL;
libsepolh = dlopen("libsepol.so.1", RTLD_NOW);
if (libsepolh) {
usesepol = 1;
dlerror();
#define DLERR() if ((errormsg = dlerror())) goto dlclose;
vers_max = dlsym(libsepolh, "sepol_policy_kern_vers_max");
DLERR();
vers_min = dlsym(libsepolh, "sepol_policy_kern_vers_min");
DLERR();
policy_file_create = dlsym(libsepolh, "sepol_policy_file_create");
DLERR();
policy_file_free = dlsym(libsepolh, "sepol_policy_file_free");
DLERR();
policy_file_set_mem = dlsym(libsepolh, "sepol_policy_file_set_mem");
DLERR();
policydb_create = dlsym(libsepolh, "sepol_policydb_create");
DLERR();
policydb_free = dlsym(libsepolh, "sepol_policydb_free");
DLERR();
policydb_read = dlsym(libsepolh, "sepol_policydb_read");
DLERR();
policydb_set_vers = dlsym(libsepolh, "sepol_policydb_set_vers");
DLERR();
policydb_to_image = dlsym(libsepolh, "sepol_policydb_to_image");
DLERR();
genbools_array = dlsym(libsepolh, "sepol_genbools_array");
DLERR();
genusers = dlsym(libsepolh, "sepol_genusers");
DLERR();
genbools = dlsym(libsepolh, "sepol_genbools");
DLERR();
#undef DLERR
}
#else
usesepol = 1;
vers_max = sepol_policy_kern_vers_max;
vers_min = sepol_policy_kern_vers_min;
policy_file_create = sepol_policy_file_create;
policy_file_free = sepol_policy_file_free;
policy_file_set_mem = sepol_policy_file_set_mem;
policydb_create = sepol_policydb_create;
policydb_free = sepol_policydb_free;
policydb_read = sepol_policydb_read;
policydb_set_vers = sepol_policydb_set_vers;
policydb_to_image = sepol_policydb_to_image;
genbools_array = sepol_genbools_array;
genusers = sepol_genusers;
genbools = sepol_genbools;
#endif
/*
* Check whether we need to support local boolean and user definitions.
*/
if (setlocaldefs) {
if (access(selinux_booleans_path(), F_OK) == 0)
goto checkbool;
snprintf(path, sizeof path, "%s.local", selinux_booleans_path());
if (access(path, F_OK) == 0)
goto checkbool;
snprintf(path, sizeof path, "%s/local.users", selinux_users_path());
if (access(path, F_OK) == 0)
goto checkbool;
/* No local definition files, so disable setlocaldefs. */
setlocaldefs = 0;
}
checkbool:
/*
* As of Linux 2.6.22, the kernel preserves boolean
* values across a reload, so we do not need to
* preserve them in userspace.
*/
if (preservebools && uname(&uts) == 0 && strverscmp(uts.release, "2.6.22") >= 0)
preservebools = 0;
if (usesepol) {
maxvers = vers_max();
minvers = vers_min();
if (!setlocaldefs && !preservebools)
maxvers = max(kernvers, maxvers);
}
vers = maxvers;
search:
snprintf(path, sizeof(path), "%s.%d",
selinux_binary_policy_path(), vers);
fd = open(path, O_RDONLY);
while (fd < 0 && errno == ENOENT
&& --vers >= minvers) {
/* Check prior versions to see if old policy is available */
snprintf(path, sizeof(path), "%s.%d",
selinux_binary_policy_path(), vers);
fd = open(path, O_RDONLY);
}
if (fd < 0) {
fprintf(stderr,
"SELinux: Could not open policy file <= %s.%d: %s\n",
selinux_binary_policy_path(), maxvers, strerror(errno));
goto dlclose;
}
if (fstat(fd, &sb) < 0) {
fprintf(stderr,
"SELinux: Could not stat policy file %s: %s\n",
path, strerror(errno));
goto close;
}
prot = PROT_READ;
if (setlocaldefs || preservebools)
prot |= PROT_WRITE;
size = sb.st_size;
data = map = mmap(NULL, size, prot, MAP_PRIVATE, fd, 0);
if (map == MAP_FAILED) {
fprintf(stderr,
"SELinux: Could not map policy file %s: %s\n",
path, strerror(errno));
goto close;
}
if (vers > kernvers && usesepol) {
/* Need to downgrade to kernel-supported version. */
if (policy_file_create(&pf))
goto unmap;
if (policydb_create(&policydb)) {
policy_file_free(pf);
goto unmap;
}
policy_file_set_mem(pf, data, size);
if (policydb_read(policydb, pf)) {
policy_file_free(pf);
policydb_free(policydb);
goto unmap;
}
if (policydb_set_vers(policydb, kernvers) ||
policydb_to_image(NULL, policydb, &data, &size)) {
/* Downgrade failed, keep searching. */
fprintf(stderr,
"SELinux: Could not downgrade policy file %s, searching for an older version.\n",
path);
policy_file_free(pf);
policydb_free(policydb);
munmap(map, sb.st_size);
close(fd);
vers--;
goto search;
}
policy_file_free(pf);
policydb_free(policydb);
}
if (usesepol) {
if (setlocaldefs) {
void *olddata = data;
size_t oldsize = size;
rc = genusers(olddata, oldsize, selinux_users_path(),
&data, &size);
if (rc < 0) {
/* Fall back to the prior image if genusers failed. */
data = olddata;
size = oldsize;
rc = 0;
} else {
if (olddata != map)
free(olddata);
}
}
#ifndef DISABLE_BOOL
if (preservebools) {
int *values, len, i;
char **names;
rc = security_get_boolean_names(&names, &len);
if (!rc) {
values = malloc(sizeof(int) * len);
if (!values)
goto unmap;
for (i = 0; i < len; i++)
values[i] =
security_get_boolean_active(names[i]);
(void)genbools_array(data, size, names, values,
len);
free(values);
for (i = 0; i < len; i++)
free(names[i]);
free(names);
}
} else if (setlocaldefs) {
(void)genbools(data, size,
(char *)selinux_booleans_path());
}
#endif
}
rc = security_load_policy(data, size);
if (rc)
fprintf(stderr,
"SELinux: Could not load policy file %s: %s\n",
path, strerror(errno));
unmap:
if (data != map)
free(data);
munmap(map, sb.st_size);
close:
close(fd);
dlclose:
#ifdef SHARED
if (errormsg)
fprintf(stderr, "libselinux: %s\n", errormsg);
if (libsepolh)
dlclose(libsepolh);
#endif
return rc;
}
static ssize_t sel_write_load(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
ssize_t length;
void *data = NULL;
mutex_lock(&sel_mutex);
length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
if (length)
goto out;
/* No partial writes. */
length = -EINVAL;
if (*ppos != 0)
goto out;
length = -EFBIG;
if (count > 64 * 1024 * 1024)
goto out;
length = -ENOMEM;
data = vmalloc(count);
if (!data)
goto out;
length = -EFAULT;
if (copy_from_user(data, buf, count) != 0)
goto out;
length = security_load_policy(data, count);
if (length) {
pr_warn_ratelimited("SELinux: failed to load policy\n");
goto out;
}
length = sel_make_bools();
if (length) {
pr_err("SELinux: failed to load policy booleans\n");
goto out1;
}
length = sel_make_classes();
if (length) {
pr_err("SELinux: failed to load policy classes\n");
goto out1;
}
length = sel_make_policycap();
if (length) {
pr_err("SELinux: failed to load policy capabilities\n");
goto out1;
}
length = count;
out1:
audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
"policy loaded auid=%u ses=%u",
from_kuid(&init_user_ns, audit_get_loginuid(current)),
audit_get_sessionid(current));
out:
mutex_unlock(&sel_mutex);
vfree(data);
return length;
}
