*
* Added validation of kernel classes and permissions
*
+ * Updated: KaiGai Kohei <kaigai@ak.jp.nec.com>
+ *
+ * Added support for bounds domain and audit messaged on masked permissions
+ *
+ * Updated: Guido Trentalancia <guido@trentalancia.com>
+ *
+ * Added support for runtime switching of the policy type
+ *
+ * Copyright (C) 2008, 2009 NEC Corporation
* Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P.
* Copyright (C) 2004-2006 Trusted Computer Solutions, Inc.
* Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC
#include <linux/audit.h>
#include <linux/mutex.h>
#include <linux/selinux.h>
+#include <linux/flex_array.h>
+#include <linux/vmalloc.h>
#include <net/netlabel.h>
#include "flask.h"
#include "audit.h"
extern void selnl_notify_policyload(u32 seqno);
-unsigned int policydb_loaded_version;
int selinux_policycap_netpeer;
int selinux_policycap_openperm;
-/*
- * This is declared in avc.c
- */
-extern const struct selinux_class_perm selinux_class_perm;
-
static DEFINE_RWLOCK(policy_rwlock);
-static DEFINE_MUTEX(load_mutex);
static struct sidtab sidtab;
struct policydb policydb;
static int context_struct_to_string(struct context *context, char **scontext,
u32 *scontext_len);
+static void context_struct_compute_av(struct context *scontext,
+ struct context *tcontext,
+ u16 tclass,
+ struct av_decision *avd);
+
+struct selinux_mapping {
+ u16 value; /* policy value */
+ unsigned num_perms;
+ u32 perms[sizeof(u32) * 8];
+};
+
+static struct selinux_mapping *current_mapping;
+static u16 current_mapping_size;
+
+static int selinux_set_mapping(struct policydb *pol,
+ struct security_class_mapping *map,
+ struct selinux_mapping **out_map_p,
+ u16 *out_map_size)
+{
+ struct selinux_mapping *out_map = NULL;
+ size_t size = sizeof(struct selinux_mapping);
+ u16 i, j;
+ unsigned k;
+ bool print_unknown_handle = false;
+
+ /* Find number of classes in the input mapping */
+ if (!map)
+ return -EINVAL;
+ i = 0;
+ while (map[i].name)
+ i++;
+
+ /* Allocate space for the class records, plus one for class zero */
+ out_map = kcalloc(++i, size, GFP_ATOMIC);
+ if (!out_map)
+ return -ENOMEM;
+
+ /* Store the raw class and permission values */
+ j = 0;
+ while (map[j].name) {
+ struct security_class_mapping *p_in = map + (j++);
+ struct selinux_mapping *p_out = out_map + j;
+
+ /* An empty class string skips ahead */
+ if (!strcmp(p_in->name, "")) {
+ p_out->num_perms = 0;
+ continue;
+ }
+
+ p_out->value = string_to_security_class(pol, p_in->name);
+ if (!p_out->value) {
+ printk(KERN_INFO
+ "SELinux: Class %s not defined in policy.\n",
+ p_in->name);
+ if (pol->reject_unknown)
+ goto err;
+ p_out->num_perms = 0;
+ print_unknown_handle = true;
+ continue;
+ }
+
+ k = 0;
+ while (p_in->perms && p_in->perms[k]) {
+ /* An empty permission string skips ahead */
+ if (!*p_in->perms[k]) {
+ k++;
+ continue;
+ }
+ p_out->perms[k] = string_to_av_perm(pol, p_out->value,
+ p_in->perms[k]);
+ if (!p_out->perms[k]) {
+ printk(KERN_INFO
+ "SELinux: Permission %s in class %s not defined in policy.\n",
+ p_in->perms[k], p_in->name);
+ if (pol->reject_unknown)
+ goto err;
+ print_unknown_handle = true;
+ }
+
+ k++;
+ }
+ p_out->num_perms = k;
+ }
+
+ if (print_unknown_handle)
+ printk(KERN_INFO "SELinux: the above unknown classes and permissions will be %s\n",
+ pol->allow_unknown ? "allowed" : "denied");
+
+ *out_map_p = out_map;
+ *out_map_size = i;
+ return 0;
+err:
+ kfree(out_map);
+ return -EINVAL;
+}
+
+/*
+ * Get real, policy values from mapped values
+ */
+
+static u16 unmap_class(u16 tclass)
+{
+ if (tclass < current_mapping_size)
+ return current_mapping[tclass].value;
+
+ return tclass;
+}
+
+static void map_decision(u16 tclass, struct av_decision *avd,
+ int allow_unknown)
+{
+ if (tclass < current_mapping_size) {
+ unsigned i, n = current_mapping[tclass].num_perms;
+ u32 result;
+
+ for (i = 0, result = 0; i < n; i++) {
+ if (avd->allowed & current_mapping[tclass].perms[i])
+ result |= 1<<i;
+ if (allow_unknown && !current_mapping[tclass].perms[i])
+ result |= 1<<i;
+ }
+ avd->allowed = result;
+
+ for (i = 0, result = 0; i < n; i++)
+ if (avd->auditallow & current_mapping[tclass].perms[i])
+ result |= 1<<i;
+ avd->auditallow = result;
+
+ for (i = 0, result = 0; i < n; i++) {
+ if (avd->auditdeny & current_mapping[tclass].perms[i])
+ result |= 1<<i;
+ if (!allow_unknown && !current_mapping[tclass].perms[i])
+ result |= 1<<i;
+ }
+ /*
+ * In case the kernel has a bug and requests a permission
+ * between num_perms and the maximum permission number, we
+ * should audit that denial
+ */
+ for (; i < (sizeof(u32)*8); i++)
+ result |= 1<<i;
+ avd->auditdeny = result;
+ }
+}
+
+int security_mls_enabled(void)
+{
+ return policydb.mls_enabled;
+}
+
/*
* Return the boolean value of a constraint expression
* when it is applied to the specified source and target
case CEXPR_AND:
BUG_ON(sp < 1);
sp--;
- s[sp] &= s[sp+1];
+ s[sp] &= s[sp + 1];
break;
case CEXPR_OR:
BUG_ON(sp < 1);
sp--;
- s[sp] |= s[sp+1];
+ s[sp] |= s[sp + 1];
break;
case CEXPR_ATTR:
- if (sp == (CEXPR_MAXDEPTH-1))
+ if (sp == (CEXPR_MAXDEPTH - 1))
return 0;
switch (e->attr) {
case CEXPR_USER:
}
/*
- * Compute access vectors based on a context structure pair for
- * the permissions in a particular class.
+ * security_dump_masked_av - dumps masked permissions during
+ * security_compute_av due to RBAC, MLS/Constraint and Type bounds.
+ */
+static int dump_masked_av_helper(void *k, void *d, void *args)
+{
+ struct perm_datum *pdatum = d;
+ char **permission_names = args;
+
+ BUG_ON(pdatum->value < 1 || pdatum->value > 32);
+
+ permission_names[pdatum->value - 1] = (char *)k;
+
+ return 0;
+}
+
+static void security_dump_masked_av(struct context *scontext,
+ struct context *tcontext,
+ u16 tclass,
+ u32 permissions,
+ const char *reason)
+{
+ struct common_datum *common_dat;
+ struct class_datum *tclass_dat;
+ struct audit_buffer *ab;
+ char *tclass_name;
+ char *scontext_name = NULL;
+ char *tcontext_name = NULL;
+ char *permission_names[32];
+ int index;
+ u32 length;
+ bool need_comma = false;
+
+ if (!permissions)
+ return;
+
+ tclass_name = policydb.p_class_val_to_name[tclass - 1];
+ tclass_dat = policydb.class_val_to_struct[tclass - 1];
+ common_dat = tclass_dat->comdatum;
+
+ /* init permission_names */
+ if (common_dat &&
+ hashtab_map(common_dat->permissions.table,
+ dump_masked_av_helper, permission_names) < 0)
+ goto out;
+
+ if (hashtab_map(tclass_dat->permissions.table,
+ dump_masked_av_helper, permission_names) < 0)
+ goto out;
+
+ /* get scontext/tcontext in text form */
+ if (context_struct_to_string(scontext,
+ &scontext_name, &length) < 0)
+ goto out;
+
+ if (context_struct_to_string(tcontext,
+ &tcontext_name, &length) < 0)
+ goto out;
+
+ /* audit a message */
+ ab = audit_log_start(current->audit_context,
+ GFP_ATOMIC, AUDIT_SELINUX_ERR);
+ if (!ab)
+ goto out;
+
+ audit_log_format(ab, "op=security_compute_av reason=%s "
+ "scontext=%s tcontext=%s tclass=%s perms=",
+ reason, scontext_name, tcontext_name, tclass_name);
+
+ for (index = 0; index < 32; index++) {
+ u32 mask = (1 << index);
+
+ if ((mask & permissions) == 0)
+ continue;
+
+ audit_log_format(ab, "%s%s",
+ need_comma ? "," : "",
+ permission_names[index]
+ ? permission_names[index] : "????");
+ need_comma = true;
+ }
+ audit_log_end(ab);
+out:
+ /* release scontext/tcontext */
+ kfree(tcontext_name);
+ kfree(scontext_name);
+
+ return;
+}
+
+/*
+ * security_boundary_permission - drops violated permissions
+ * on boundary constraint.
*/
-static int context_struct_compute_av(struct context *scontext,
+static void type_attribute_bounds_av(struct context *scontext,
struct context *tcontext,
u16 tclass,
- u32 requested,
struct av_decision *avd)
{
+ struct context lo_scontext;
+ struct context lo_tcontext;
+ struct av_decision lo_avd;
+ struct type_datum *source;
+ struct type_datum *target;
+ u32 masked = 0;
+
+ source = flex_array_get_ptr(policydb.type_val_to_struct_array,
+ scontext->type - 1);
+ BUG_ON(!source);
+
+ target = flex_array_get_ptr(policydb.type_val_to_struct_array,
+ tcontext->type - 1);
+ BUG_ON(!target);
+
+ if (source->bounds) {
+ memset(&lo_avd, 0, sizeof(lo_avd));
+
+ memcpy(&lo_scontext, scontext, sizeof(lo_scontext));
+ lo_scontext.type = source->bounds;
+
+ context_struct_compute_av(&lo_scontext,
+ tcontext,
+ tclass,
+ &lo_avd);
+ if ((lo_avd.allowed & avd->allowed) == avd->allowed)
+ return; /* no masked permission */
+ masked = ~lo_avd.allowed & avd->allowed;
+ }
+
+ if (target->bounds) {
+ memset(&lo_avd, 0, sizeof(lo_avd));
+
+ memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext));
+ lo_tcontext.type = target->bounds;
+
+ context_struct_compute_av(scontext,
+ &lo_tcontext,
+ tclass,
+ &lo_avd);
+ if ((lo_avd.allowed & avd->allowed) == avd->allowed)
+ return; /* no masked permission */
+ masked = ~lo_avd.allowed & avd->allowed;
+ }
+
+ if (source->bounds && target->bounds) {
+ memset(&lo_avd, 0, sizeof(lo_avd));
+ /*
+ * lo_scontext and lo_tcontext are already
+ * set up.
+ */
+
+ context_struct_compute_av(&lo_scontext,
+ &lo_tcontext,
+ tclass,
+ &lo_avd);
+ if ((lo_avd.allowed & avd->allowed) == avd->allowed)
+ return; /* no masked permission */
+ masked = ~lo_avd.allowed & avd->allowed;
+ }
+
+ if (masked) {
+ /* mask violated permissions */
+ avd->allowed &= ~masked;
+
+ /* audit masked permissions */
+ security_dump_masked_av(scontext, tcontext,
+ tclass, masked, "bounds");
+ }
+}
+
+/*
+ * Compute access vectors based on a context structure pair for
+ * the permissions in a particular class.
+ */
+static void context_struct_compute_av(struct context *scontext,
+ struct context *tcontext,
+ u16 tclass,
+ struct av_decision *avd)
+{
struct constraint_node *constraint;
struct role_allow *ra;
struct avtab_key avkey;
struct class_datum *tclass_datum;
struct ebitmap *sattr, *tattr;
struct ebitmap_node *snode, *tnode;
- const struct selinux_class_perm *kdefs = &selinux_class_perm;
unsigned int i, j;
- /*
- * Remap extended Netlink classes for old policy versions.
- * Do this here rather than socket_type_to_security_class()
- * in case a newer policy version is loaded, allowing sockets
- * to remain in the correct class.
- */
- if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS)
- if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET &&
- tclass <= SECCLASS_NETLINK_DNRT_SOCKET)
- tclass = SECCLASS_NETLINK_SOCKET;
-
- /*
- * Initialize the access vectors to the default values.
- */
avd->allowed = 0;
- avd->decided = 0xffffffff;
avd->auditallow = 0;
avd->auditdeny = 0xffffffff;
- avd->seqno = latest_granting;
- /*
- * Check for all the invalid cases.
- * - tclass 0
- * - tclass > policy and > kernel
- * - tclass > policy but is a userspace class
- * - tclass > policy but we do not allow unknowns
- */
- if (unlikely(!tclass))
- goto inval_class;
- if (unlikely(tclass > policydb.p_classes.nprim))
- if (tclass > kdefs->cts_len ||
- !kdefs->class_to_string[tclass] ||
- !policydb.allow_unknown)
- goto inval_class;
-
- /*
- * Kernel class and we allow unknown so pad the allow decision
- * the pad will be all 1 for unknown classes.
- */
- if (tclass <= kdefs->cts_len && policydb.allow_unknown)
- avd->allowed = policydb.undefined_perms[tclass - 1];
-
- /*
- * Not in policy. Since decision is completed (all 1 or all 0) return.
- */
- if (unlikely(tclass > policydb.p_classes.nprim))
- return 0;
+ if (unlikely(!tclass || tclass > policydb.p_classes.nprim)) {
+ if (printk_ratelimit())
+ printk(KERN_WARNING "SELinux: Invalid class %hu\n", tclass);
+ return;
+ }
tclass_datum = policydb.class_val_to_struct[tclass - 1];
*/
avkey.target_class = tclass;
avkey.specified = AVTAB_AV;
- sattr = &policydb.type_attr_map[scontext->type - 1];
- tattr = &policydb.type_attr_map[tcontext->type - 1];
+ sattr = flex_array_get(policydb.type_attr_map_array, scontext->type - 1);
+ BUG_ON(!sattr);
+ tattr = flex_array_get(policydb.type_attr_map_array, tcontext->type - 1);
+ BUG_ON(!tattr);
ebitmap_for_each_positive_bit(sattr, snode, i) {
ebitmap_for_each_positive_bit(tattr, tnode, j) {
avkey.source_type = i + 1;
avkey.target_type = j + 1;
for (node = avtab_search_node(&policydb.te_avtab, &avkey);
- node != NULL;
+ node;
node = avtab_search_node_next(node, avkey.specified)) {
if (node->key.specified == AVTAB_ALLOWED)
avd->allowed |= node->datum.data;
if ((constraint->permissions & (avd->allowed)) &&
!constraint_expr_eval(scontext, tcontext, NULL,
constraint->expr)) {
- avd->allowed = (avd->allowed) & ~(constraint->permissions);
+ avd->allowed &= ~(constraint->permissions);
}
constraint = constraint->next;
}
* role is changing, then check the (current_role, new_role)
* pair.
*/
- if (tclass == SECCLASS_PROCESS &&
- (avd->allowed & (PROCESS__TRANSITION | PROCESS__DYNTRANSITION)) &&
+ if (tclass == policydb.process_class &&
+ (avd->allowed & policydb.process_trans_perms) &&
scontext->role != tcontext->role) {
for (ra = policydb.role_allow; ra; ra = ra->next) {
if (scontext->role == ra->role &&
break;
}
if (!ra)
- avd->allowed = (avd->allowed) & ~(PROCESS__TRANSITION |
- PROCESS__DYNTRANSITION);
+ avd->allowed &= ~policydb.process_trans_perms;
}
- return 0;
-
-inval_class:
- printk(KERN_ERR "SELinux: %s: unrecognized class %d\n", __func__,
- tclass);
- return -EINVAL;
-}
-
-/*
- * Given a sid find if the type has the permissive flag set
- */
-int security_permissive_sid(u32 sid)
-{
- struct context *context;
- u32 type;
- int rc;
-
- read_lock(&policy_rwlock);
-
- context = sidtab_search(&sidtab, sid);
- BUG_ON(!context);
-
- type = context->type;
/*
- * we are intentionally using type here, not type-1, the 0th bit may
- * someday indicate that we are globally setting permissive in policy.
+ * If the given source and target types have boundary
+ * constraint, lazy checks have to mask any violated
+ * permission and notice it to userspace via audit.
*/
- rc = ebitmap_get_bit(&policydb.permissive_map, type);
-
- read_unlock(&policy_rwlock);
- return rc;
+ type_attribute_bounds_av(scontext, tcontext,
+ tclass, avd);
}
static int security_validtrans_handle_fail(struct context *ocontext,
char *o = NULL, *n = NULL, *t = NULL;
u32 olen, nlen, tlen;
- if (context_struct_to_string(ocontext, &o, &olen) < 0)
+ if (context_struct_to_string(ocontext, &o, &olen))
goto out;
- if (context_struct_to_string(ncontext, &n, &nlen) < 0)
+ if (context_struct_to_string(ncontext, &n, &nlen))
goto out;
- if (context_struct_to_string(tcontext, &t, &tlen) < 0)
+ 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"
}
int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
- u16 tclass)
+ u16 orig_tclass)
{
struct context *ocontext;
struct context *ncontext;
struct context *tcontext;
struct class_datum *tclass_datum;
struct constraint_node *constraint;
+ u16 tclass;
int rc = 0;
if (!ss_initialized)
read_lock(&policy_rwlock);
- /*
- * Remap extended Netlink classes for old policy versions.
- * Do this here rather than socket_type_to_security_class()
- * in case a newer policy version is loaded, allowing sockets
- * to remain in the correct class.
- */
- if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS)
- if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET &&
- tclass <= SECCLASS_NETLINK_DNRT_SOCKET)
- tclass = SECCLASS_NETLINK_SOCKET;
+ tclass = unmap_class(orig_tclass);
if (!tclass || tclass > policydb.p_classes.nprim) {
printk(KERN_ERR "SELinux: %s: unrecognized class %d\n",
return rc;
}
+/*
+ * security_bounded_transition - check whether the given
+ * transition is directed to bounded, or not.
+ * It returns 0, if @newsid is bounded by @oldsid.
+ * Otherwise, it returns error code.
+ *
+ * @oldsid : current security identifier
+ * @newsid : destinated security identifier
+ */
+int security_bounded_transition(u32 old_sid, u32 new_sid)
+{
+ struct context *old_context, *new_context;
+ struct type_datum *type;
+ int index;
+ int rc;
+
+ read_lock(&policy_rwlock);
+
+ rc = -EINVAL;
+ old_context = sidtab_search(&sidtab, old_sid);
+ if (!old_context) {
+ printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n",
+ __func__, old_sid);
+ goto out;
+ }
+
+ rc = -EINVAL;
+ new_context = sidtab_search(&sidtab, new_sid);
+ if (!new_context) {
+ printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n",
+ __func__, new_sid);
+ goto out;
+ }
+
+ rc = 0;
+ /* type/domain unchanged */
+ if (old_context->type == new_context->type)
+ goto out;
+
+ index = new_context->type;
+ while (true) {
+ type = flex_array_get_ptr(policydb.type_val_to_struct_array,
+ index - 1);
+ BUG_ON(!type);
+
+ /* not bounded anymore */
+ rc = -EPERM;
+ if (!type->bounds)
+ break;
+
+ /* @newsid is bounded by @oldsid */
+ rc = 0;
+ if (type->bounds == old_context->type)
+ break;
+
+ index = type->bounds;
+ }
+
+ if (rc) {
+ char *old_name = NULL;
+ char *new_name = NULL;
+ u32 length;
+
+ if (!context_struct_to_string(old_context,
+ &old_name, &length) &&
+ !context_struct_to_string(new_context,
+ &new_name, &length)) {
+ audit_log(current->audit_context,
+ GFP_ATOMIC, AUDIT_SELINUX_ERR,
+ "op=security_bounded_transition "
+ "result=denied "
+ "oldcontext=%s newcontext=%s",
+ old_name, new_name);
+ }
+ kfree(new_name);
+ kfree(old_name);
+ }
+out:
+ read_unlock(&policy_rwlock);
+
+ return rc;
+}
+
+static void avd_init(struct av_decision *avd)
+{
+ avd->allowed = 0;
+ avd->auditallow = 0;
+ avd->auditdeny = 0xffffffff;
+ avd->seqno = latest_granting;
+ avd->flags = 0;
+}
+
+
/**
* security_compute_av - Compute access vector decisions.
* @ssid: source security identifier
* @tsid: target security identifier
* @tclass: target security class
- * @requested: requested permissions
* @avd: access vector decisions
*
* Compute a set of access vector decisions based on the
* SID pair (@ssid, @tsid) for the permissions in @tclass.
- * Return -%EINVAL if any of the parameters are invalid or %0
- * if the access vector decisions were computed successfully.
*/
-int security_compute_av(u32 ssid,
- u32 tsid,
- u16 tclass,
- u32 requested,
- struct av_decision *avd)
+void security_compute_av(u32 ssid,
+ u32 tsid,
+ u16 orig_tclass,
+ struct av_decision *avd)
{
+ u16 tclass;
struct context *scontext = NULL, *tcontext = NULL;
- int rc = 0;
- if (!ss_initialized) {
- avd->allowed = 0xffffffff;
- avd->decided = 0xffffffff;
- avd->auditallow = 0;
- avd->auditdeny = 0xffffffff;
- avd->seqno = latest_granting;
- return 0;
+ read_lock(&policy_rwlock);
+ avd_init(avd);
+ if (!ss_initialized)
+ goto allow;
+
+ scontext = sidtab_search(&sidtab, ssid);
+ if (!scontext) {
+ printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
+ __func__, ssid);
+ goto out;
+ }
+
+ /* permissive domain? */
+ if (ebitmap_get_bit(&policydb.permissive_map, scontext->type))
+ avd->flags |= AVD_FLAGS_PERMISSIVE;
+
+ tcontext = sidtab_search(&sidtab, tsid);
+ if (!tcontext) {
+ printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
+ __func__, tsid);
+ goto out;
+ }
+
+ tclass = unmap_class(orig_tclass);
+ if (unlikely(orig_tclass && !tclass)) {
+ if (policydb.allow_unknown)
+ goto allow;
+ goto out;
}
+ context_struct_compute_av(scontext, tcontext, tclass, avd);
+ map_decision(orig_tclass, avd, policydb.allow_unknown);
+out:
+ read_unlock(&policy_rwlock);
+ return;
+allow:
+ avd->allowed = 0xffffffff;
+ goto out;
+}
+
+void security_compute_av_user(u32 ssid,
+ u32 tsid,
+ u16 tclass,
+ struct av_decision *avd)
+{
+ struct context *scontext = NULL, *tcontext = NULL;
read_lock(&policy_rwlock);
+ avd_init(avd);
+ if (!ss_initialized)
+ goto allow;
scontext = sidtab_search(&sidtab, ssid);
if (!scontext) {
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
__func__, ssid);
- rc = -EINVAL;
goto out;
}
+
+ /* permissive domain? */
+ if (ebitmap_get_bit(&policydb.permissive_map, scontext->type))
+ avd->flags |= AVD_FLAGS_PERMISSIVE;
+
tcontext = sidtab_search(&sidtab, tsid);
if (!tcontext) {
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
__func__, tsid);
- rc = -EINVAL;
goto out;
}
- rc = context_struct_compute_av(scontext, tcontext, tclass,
- requested, avd);
-out:
+ if (unlikely(!tclass)) {
+ if (policydb.allow_unknown)
+ goto allow;
+ goto out;
+ }
+
+ context_struct_compute_av(scontext, tcontext, tclass, avd);
+ out:
read_unlock(&policy_rwlock);
- return rc;
+ return;
+allow:
+ avd->allowed = 0xffffffff;
+ goto out;
}
/*
{
char *scontextp;
- *scontext = NULL;
+ if (scontext)
+ *scontext = NULL;
*scontext_len = 0;
if (context->len) {
*scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1;
*scontext_len += mls_compute_context_len(context);
+ if (!scontext)
+ return 0;
+
/* Allocate space for the context; caller must free this space. */
scontextp = kmalloc(*scontext_len, GFP_ATOMIC);
if (!scontextp)
struct context *context;
int rc = 0;
- *scontext = NULL;
+ if (scontext)
+ *scontext = NULL;
*scontext_len = 0;
if (!ss_initialized) {
char *scontextp;
*scontext_len = strlen(initial_sid_to_string[sid]) + 1;
+ if (!scontext)
+ goto out;
scontextp = kmalloc(*scontext_len, GFP_ATOMIC);
if (!scontextp) {
rc = -ENOMEM;
*p++ = 0;
typdatum = hashtab_search(pol->p_types.table, scontextp);
- if (!typdatum)
+ if (!typdatum || typdatum->attribute)
goto out;
ctx->type = typdatum->value;
if (rc)
goto out;
- if ((p - scontext) < scontext_len) {
- rc = -EINVAL;
+ rc = -EINVAL;
+ if ((p - scontext) < scontext_len)
goto out;
- }
/* Check the validity of the new context. */
- if (!policydb_context_isvalid(pol, ctx)) {
- rc = -EINVAL;
- context_destroy(ctx);
+ if (!policydb_context_isvalid(pol, ctx))
goto out;
- }
rc = 0;
out:
+ if (rc)
+ context_destroy(ctx);
return rc;
}
*sid = SECSID_NULL;
/* Copy the string so that we can modify the copy as we parse it. */
- scontext2 = kmalloc(scontext_len+1, gfp_flags);
+ scontext2 = kmalloc(scontext_len + 1, gfp_flags);
if (!scontext2)
return -ENOMEM;
memcpy(scontext2, scontext, scontext_len);
if (force) {
/* Save another copy for storing in uninterpreted form */
+ rc = -ENOMEM;
str = kstrdup(scontext2, gfp_flags);
- if (!str) {
- kfree(scontext2);
- return -ENOMEM;
- }
+ if (!str)
+ goto out;
}
read_lock(&policy_rwlock);
- rc = string_to_context_struct(&policydb, &sidtab,
- scontext2, scontext_len,
- &context, def_sid);
+ rc = string_to_context_struct(&policydb, &sidtab, scontext2,
+ scontext_len, &context, def_sid);
if (rc == -EINVAL && force) {
context.str = str;
context.len = scontext_len;
str = NULL;
} else if (rc)
- goto out;
+ goto out_unlock;
rc = sidtab_context_to_sid(&sidtab, &context, sid);
- if (rc)
- context_destroy(&context);
-out:
+ context_destroy(&context);
+out_unlock:
read_unlock(&policy_rwlock);
+out:
kfree(scontext2);
kfree(str);
return rc;
char *s = NULL, *t = NULL, *n = NULL;
u32 slen, tlen, nlen;
- if (context_struct_to_string(scontext, &s, &slen) < 0)
+ if (context_struct_to_string(scontext, &s, &slen))
goto out;
- if (context_struct_to_string(tcontext, &t, &tlen) < 0)
+ if (context_struct_to_string(tcontext, &t, &tlen))
goto out;
- if (context_struct_to_string(newcontext, &n, &nlen) < 0)
+ 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"
static int security_compute_sid(u32 ssid,
u32 tsid,
- u16 tclass,
+ u16 orig_tclass,
u32 specified,
- u32 *out_sid)
+ u32 *out_sid,
+ bool kern)
{
struct context *scontext = NULL, *tcontext = NULL, newcontext;
struct role_trans *roletr = NULL;
struct avtab_key avkey;
struct avtab_datum *avdatum;
struct avtab_node *node;
+ u16 tclass;
int rc = 0;
if (!ss_initialized) {
- switch (tclass) {
- case SECCLASS_PROCESS:
+ switch (orig_tclass) {
+ case SECCLASS_PROCESS: /* kernel value */
*out_sid = ssid;
break;
default:
read_lock(&policy_rwlock);
+ if (kern)
+ tclass = unmap_class(orig_tclass);
+ else
+ tclass = orig_tclass;
+
scontext = sidtab_search(&sidtab, ssid);
if (!scontext) {
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
}
/* Set the role and type to default values. */
- switch (tclass) {
- case SECCLASS_PROCESS:
+ if (tclass == policydb.process_class) {
/* Use the current role and type of process. */
newcontext.role = scontext->role;
newcontext.type = scontext->type;
- break;
- default:
+ } else {
/* Use the well-defined object role. */
newcontext.role = OBJECT_R_VAL;
/* Use the type of the related object. */
/* If no permanent rule, also check for enabled conditional rules */
if (!avdatum) {
node = avtab_search_node(&policydb.te_cond_avtab, &avkey);
- for (; node != NULL; node = avtab_search_node_next(node, specified)) {
+ for (; node; node = avtab_search_node_next(node, specified)) {
if (node->key.specified & AVTAB_ENABLED) {
avdatum = &node->datum;
break;
}
/* Check for class-specific changes. */
- switch (tclass) {
- case SECCLASS_PROCESS:
+ if (tclass == policydb.process_class) {
if (specified & AVTAB_TRANSITION) {
/* Look for a role transition rule. */
for (roletr = policydb.role_tr; roletr;
}
}
}
- break;
- default:
- break;
}
/* Set the MLS attributes.
u16 tclass,
u32 *out_sid)
{
- return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, out_sid);
+ return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION,
+ out_sid, true);
+}
+
+int security_transition_sid_user(u32 ssid,
+ u32 tsid,
+ u16 tclass,
+ u32 *out_sid)
+{
+ return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION,
+ out_sid, false);
}
/**
u16 tclass,
u32 *out_sid)
{
- return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid);
+ return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid,
+ false);
}
/**
u16 tclass,
u32 *out_sid)
{
- return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid);
-}
-
-/*
- * Verify that each kernel class that is defined in the
- * policy is correct
- */
-static int validate_classes(struct policydb *p)
-{
- int i, j;
- struct class_datum *cladatum;
- struct perm_datum *perdatum;
- u32 nprim, tmp, common_pts_len, perm_val, pol_val;
- u16 class_val;
- const struct selinux_class_perm *kdefs = &selinux_class_perm;
- const char *def_class, *def_perm, *pol_class;
- struct symtab *perms;
-
- if (p->allow_unknown) {
- u32 num_classes = kdefs->cts_len;
- p->undefined_perms = kcalloc(num_classes, sizeof(u32), GFP_KERNEL);
- if (!p->undefined_perms)
- return -ENOMEM;
- }
-
- for (i = 1; i < kdefs->cts_len; i++) {
- def_class = kdefs->class_to_string[i];
- if (!def_class)
- continue;
- if (i > p->p_classes.nprim) {
- printk(KERN_INFO
- "SELinux: class %s not defined in policy\n",
- def_class);
- if (p->reject_unknown)
- return -EINVAL;
- if (p->allow_unknown)
- p->undefined_perms[i-1] = ~0U;
- continue;
- }
- pol_class = p->p_class_val_to_name[i-1];
- if (strcmp(pol_class, def_class)) {
- printk(KERN_ERR
- "SELinux: class %d is incorrect, found %s but should be %s\n",
- i, pol_class, def_class);
- return -EINVAL;
- }
- }
- for (i = 0; i < kdefs->av_pts_len; i++) {
- class_val = kdefs->av_perm_to_string[i].tclass;
- perm_val = kdefs->av_perm_to_string[i].value;
- def_perm = kdefs->av_perm_to_string[i].name;
- if (class_val > p->p_classes.nprim)
- continue;
- pol_class = p->p_class_val_to_name[class_val-1];
- cladatum = hashtab_search(p->p_classes.table, pol_class);
- BUG_ON(!cladatum);
- perms = &cladatum->permissions;
- nprim = 1 << (perms->nprim - 1);
- if (perm_val > nprim) {
- printk(KERN_INFO
- "SELinux: permission %s in class %s not defined in policy\n",
- def_perm, pol_class);
- if (p->reject_unknown)
- return -EINVAL;
- if (p->allow_unknown)
- p->undefined_perms[class_val-1] |= perm_val;
- continue;
- }
- perdatum = hashtab_search(perms->table, def_perm);
- if (perdatum == NULL) {
- printk(KERN_ERR
- "SELinux: permission %s in class %s not found in policy, bad policy\n",
- def_perm, pol_class);
- return -EINVAL;
- }
- pol_val = 1 << (perdatum->value - 1);
- if (pol_val != perm_val) {
- printk(KERN_ERR
- "SELinux: permission %s in class %s has incorrect value\n",
- def_perm, pol_class);
- return -EINVAL;
- }
- }
- for (i = 0; i < kdefs->av_inherit_len; i++) {
- class_val = kdefs->av_inherit[i].tclass;
- if (class_val > p->p_classes.nprim)
- continue;
- pol_class = p->p_class_val_to_name[class_val-1];
- cladatum = hashtab_search(p->p_classes.table, pol_class);
- BUG_ON(!cladatum);
- if (!cladatum->comdatum) {
- printk(KERN_ERR
- "SELinux: class %s should have an inherits clause but does not\n",
- pol_class);
- return -EINVAL;
- }
- tmp = kdefs->av_inherit[i].common_base;
- common_pts_len = 0;
- while (!(tmp & 0x01)) {
- common_pts_len++;
- tmp >>= 1;
- }
- perms = &cladatum->comdatum->permissions;
- for (j = 0; j < common_pts_len; j++) {
- def_perm = kdefs->av_inherit[i].common_pts[j];
- if (j >= perms->nprim) {
- printk(KERN_INFO
- "SELinux: permission %s in class %s not defined in policy\n",
- def_perm, pol_class);
- if (p->reject_unknown)
- return -EINVAL;
- if (p->allow_unknown)
- p->undefined_perms[class_val-1] |= (1 << j);
- continue;
- }
- perdatum = hashtab_search(perms->table, def_perm);
- if (perdatum == NULL) {
- printk(KERN_ERR
- "SELinux: permission %s in class %s not found in policy, bad policy\n",
- def_perm, pol_class);
- return -EINVAL;
- }
- if (perdatum->value != j + 1) {
- printk(KERN_ERR
- "SELinux: permission %s in class %s has incorrect value\n",
- def_perm, pol_class);
- return -EINVAL;
- }
- }
- }
- return 0;
+ return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid,
+ false);
}
/* Clone the SID into the new SID table. */
{
struct sidtab *s = arg;
- return sidtab_insert(s, sid, context);
+ if (sid > SECINITSID_NUM)
+ return sidtab_insert(s, sid, context);
+ else
+ return 0;
}
static inline int convert_context_handle_invalid_context(struct context *context)
{
- int rc = 0;
+ char *s;
+ u32 len;
- if (selinux_enforcing) {
- rc = -EINVAL;
- } else {
- char *s;
- u32 len;
-
- if (!context_struct_to_string(context, &s, &len)) {
- printk(KERN_WARNING
- "SELinux: Context %s would be invalid if enforcing\n",
- s);
- kfree(s);
- }
+ if (selinux_enforcing)
+ return -EINVAL;
+
+ if (!context_struct_to_string(context, &s, &len)) {
+ printk(KERN_WARNING "SELinux: Context %s would be invalid if enforcing\n", s);
+ kfree(s);
}
- return rc;
+ return 0;
}
struct convert_context_args {
{
struct convert_context_args *args;
struct context oldc;
+ struct ocontext *oc;
+ struct mls_range *range;
struct role_datum *role;
struct type_datum *typdatum;
struct user_datum *usrdatum;
char *s;
u32 len;
- int rc;
+ int rc = 0;
+
+ if (key <= SECINITSID_NUM)
+ goto out;
args = p;
if (c->str) {
struct context ctx;
+
+ rc = -ENOMEM;
s = kstrdup(c->str, GFP_KERNEL);
- if (!s) {
- rc = -ENOMEM;
+ if (!s)
goto out;
- }
+
rc = string_to_context_struct(args->newp, NULL, s,
c->len, &ctx, SECSID_NULL);
kfree(s);
if (!rc) {
- printk(KERN_INFO
- "SELinux: Context %s became valid (mapped).\n",
+ printk(KERN_INFO "SELinux: Context %s became valid (mapped).\n",
c->str);
/* Replace string with mapped representation. */
kfree(c->str);
goto out;
} else {
/* Other error condition, e.g. ENOMEM. */
- printk(KERN_ERR
- "SELinux: Unable to map context %s, rc = %d.\n",
+ printk(KERN_ERR "SELinux: Unable to map context %s, rc = %d.\n",
c->str, -rc);
goto out;
}
if (rc)
goto out;
- rc = -EINVAL;
-
/* Convert the user. */
+ rc = -EINVAL;
usrdatum = hashtab_search(args->newp->p_users.table,
args->oldp->p_user_val_to_name[c->user - 1]);
if (!usrdatum)
c->user = usrdatum->value;
/* Convert the role. */
+ rc = -EINVAL;
role = hashtab_search(args->newp->p_roles.table,
args->oldp->p_role_val_to_name[c->role - 1]);
if (!role)
c->role = role->value;
/* Convert the type. */
+ rc = -EINVAL;
typdatum = hashtab_search(args->newp->p_types.table,
args->oldp->p_type_val_to_name[c->type - 1]);
if (!typdatum)
goto bad;
c->type = typdatum->value;
- rc = mls_convert_context(args->oldp, args->newp, c);
- if (rc)
- goto bad;
+ /* Convert the MLS fields if dealing with MLS policies */
+ if (args->oldp->mls_enabled && args->newp->mls_enabled) {
+ rc = mls_convert_context(args->oldp, args->newp, c);
+ if (rc)
+ goto bad;
+ } else if (args->oldp->mls_enabled && !args->newp->mls_enabled) {
+ /*
+ * Switching between MLS and non-MLS policy:
+ * free any storage used by the MLS fields in the
+ * context for all existing entries in the sidtab.
+ */
+ mls_context_destroy(c);
+ } else if (!args->oldp->mls_enabled && args->newp->mls_enabled) {
+ /*
+ * Switching between non-MLS and MLS policy:
+ * ensure that the MLS fields of the context for all
+ * existing entries in the sidtab are filled in with a
+ * suitable default value, likely taken from one of the
+ * initial SIDs.
+ */
+ oc = args->newp->ocontexts[OCON_ISID];
+ while (oc && oc->sid[0] != SECINITSID_UNLABELED)
+ oc = oc->next;
+ rc = -EINVAL;
+ if (!oc) {
+ printk(KERN_ERR "SELinux: unable to look up"
+ " the initial SIDs list\n");
+ goto bad;
+ }
+ range = &oc->context[0].range;
+ rc = mls_range_set(c, range);
+ if (rc)
+ goto bad;
+ }
/* Check the validity of the new context. */
if (!policydb_context_isvalid(args->newp, c)) {
}
context_destroy(&oldc);
+
rc = 0;
out:
return rc;
bad:
/* Map old representation to string and save it. */
- if (context_struct_to_string(&oldc, &s, &len))
- return -ENOMEM;
+ rc = context_struct_to_string(&oldc, &s, &len);
+ if (rc)
+ return rc;
context_destroy(&oldc);
context_destroy(c);
c->str = s;
c->len = len;
- printk(KERN_INFO
- "SELinux: Context %s became invalid (unmapped).\n",
+ printk(KERN_INFO "SELinux: Context %s became invalid (unmapped).\n",
c->str);
rc = 0;
goto out;
{
struct policydb oldpolicydb, newpolicydb;
struct sidtab oldsidtab, newsidtab;
+ struct selinux_mapping *oldmap, *map = NULL;
struct convert_context_args args;
u32 seqno;
+ u16 map_size;
int rc = 0;
struct policy_file file = { data, len }, *fp = &file;
- mutex_lock(&load_mutex);
-
if (!ss_initialized) {
avtab_cache_init();
- if (policydb_read(&policydb, fp)) {
- mutex_unlock(&load_mutex);
+ rc = policydb_read(&policydb, fp);
+ if (rc) {
avtab_cache_destroy();
- return -EINVAL;
+ return rc;
}
- if (policydb_load_isids(&policydb, &sidtab)) {
- mutex_unlock(&load_mutex);
+
+ policydb.len = len;
+ rc = selinux_set_mapping(&policydb, secclass_map,
+ ¤t_mapping,
+ ¤t_mapping_size);
+ if (rc) {
policydb_destroy(&policydb);
avtab_cache_destroy();
- return -EINVAL;
+ return rc;
}
- /* Verify that the kernel defined classes are correct. */
- if (validate_classes(&policydb)) {
- printk(KERN_ERR
- "SELinux: the definition of a class is incorrect\n");
- mutex_unlock(&load_mutex);
- sidtab_destroy(&sidtab);
+
+ rc = policydb_load_isids(&policydb, &sidtab);
+ if (rc) {
policydb_destroy(&policydb);
avtab_cache_destroy();
- return -EINVAL;
+ return rc;
}
+
security_load_policycaps();
- policydb_loaded_version = policydb.policyvers;
ss_initialized = 1;
seqno = ++latest_granting;
- mutex_unlock(&load_mutex);
selinux_complete_init();
avc_ss_reset(seqno);
selnl_notify_policyload(seqno);
+ selinux_status_update_policyload(seqno);
selinux_netlbl_cache_invalidate();
selinux_xfrm_notify_policyload();
return 0;
sidtab_hash_eval(&sidtab, "sids");
#endif
- if (policydb_read(&newpolicydb, fp)) {
- mutex_unlock(&load_mutex);
- return -EINVAL;
- }
+ rc = policydb_read(&newpolicydb, fp);
+ if (rc)
+ return rc;
+
+ newpolicydb.len = len;
+ /* If switching between different policy types, log MLS status */
+ if (policydb.mls_enabled && !newpolicydb.mls_enabled)
+ printk(KERN_INFO "SELinux: Disabling MLS support...\n");
+ else if (!policydb.mls_enabled && newpolicydb.mls_enabled)
+ printk(KERN_INFO "SELinux: Enabling MLS support...\n");
- if (sidtab_init(&newsidtab)) {
- mutex_unlock(&load_mutex);
+ rc = policydb_load_isids(&newpolicydb, &newsidtab);
+ if (rc) {
+ printk(KERN_ERR "SELinux: unable to load the initial SIDs\n");
policydb_destroy(&newpolicydb);
- return -ENOMEM;
+ return rc;
}
- /* Verify that the kernel defined classes are correct. */
- if (validate_classes(&newpolicydb)) {
- printk(KERN_ERR
- "SELinux: the definition of a class is incorrect\n");
- rc = -EINVAL;
+ rc = selinux_set_mapping(&newpolicydb, secclass_map, &map, &map_size);
+ if (rc)
goto err;
- }
rc = security_preserve_bools(&newpolicydb);
if (rc) {
/* Clone the SID table. */
sidtab_shutdown(&sidtab);
- if (sidtab_map(&sidtab, clone_sid, &newsidtab)) {
- rc = -ENOMEM;
+
+ rc = sidtab_map(&sidtab, clone_sid, &newsidtab);
+ if (rc)
goto err;
- }
/*
* Convert the internal representations of contexts
args.oldp = &policydb;
args.newp = &newpolicydb;
rc = sidtab_map(&newsidtab, convert_context, &args);
- if (rc)
+ if (rc) {
+ printk(KERN_ERR "SELinux: unable to convert the internal"
+ " representation of contexts in the new SID"
+ " table\n");
goto err;
+ }
/* Save the old policydb and SID table to free later. */
memcpy(&oldpolicydb, &policydb, sizeof policydb);
memcpy(&policydb, &newpolicydb, sizeof policydb);
sidtab_set(&sidtab, &newsidtab);
security_load_policycaps();
+ oldmap = current_mapping;
+ current_mapping = map;
+ current_mapping_size = map_size;
seqno = ++latest_granting;
- policydb_loaded_version = policydb.policyvers;
write_unlock_irq(&policy_rwlock);
- mutex_unlock(&load_mutex);
/* Free the old policydb and SID table. */
policydb_destroy(&oldpolicydb);
sidtab_destroy(&oldsidtab);
+ kfree(oldmap);
avc_ss_reset(seqno);
selnl_notify_policyload(seqno);
+ selinux_status_update_policyload(seqno);
selinux_netlbl_cache_invalidate();
selinux_xfrm_notify_policyload();
return 0;
err:
- mutex_unlock(&load_mutex);
+ kfree(map);
sidtab_destroy(&newsidtab);
policydb_destroy(&newpolicydb);
return rc;
}
+size_t security_policydb_len(void)
+{
+ size_t len;
+
+ read_lock(&policy_rwlock);
+ len = policydb.len;
+ read_unlock(&policy_rwlock);
+
+ return len;
+}
+
/**
* security_port_sid - Obtain the SID for a port.
* @protocol: protocol number
u32 addrlen,
u32 *out_sid)
{
- int rc = 0;
+ int rc;
struct ocontext *c;
read_lock(&policy_rwlock);
case AF_INET: {
u32 addr;
- if (addrlen != sizeof(u32)) {
- rc = -EINVAL;
+ rc = -EINVAL;
+ if (addrlen != sizeof(u32))
goto out;
- }
addr = *((u32 *)addrp);
}
case AF_INET6:
- if (addrlen != sizeof(u64) * 2) {
- rc = -EINVAL;
+ rc = -EINVAL;
+ if (addrlen != sizeof(u64) * 2)
goto out;
- }
c = policydb.ocontexts[OCON_NODE6];
while (c) {
if (match_ipv6_addrmask(addrp, c->u.node6.addr,
break;
default:
+ rc = 0;
*out_sid = SECINITSID_NODE;
goto out;
}
*out_sid = SECINITSID_NODE;
}
+ rc = 0;
out:
read_unlock(&policy_rwlock);
return rc;
context_init(&usercon);
+ rc = -EINVAL;
fromcon = sidtab_search(&sidtab, fromsid);
- if (!fromcon) {
- rc = -EINVAL;
+ if (!fromcon)
goto out_unlock;
- }
+ rc = -EINVAL;
user = hashtab_search(policydb.p_users.table, username);
- if (!user) {
- rc = -EINVAL;
+ if (!user)
goto out_unlock;
- }
+
usercon.user = user->value;
+ rc = -ENOMEM;
mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC);
- if (!mysids) {
- rc = -ENOMEM;
+ if (!mysids)
goto out_unlock;
- }
ebitmap_for_each_positive_bit(&user->roles, rnode, i) {
role = policydb.role_val_to_struct[i];
- usercon.role = i+1;
+ usercon.role = i + 1;
ebitmap_for_each_positive_bit(&role->types, tnode, j) {
- usercon.type = j+1;
+ usercon.type = j + 1;
if (mls_setup_user_range(fromcon, user, &usercon))
continue;
if (mynel < maxnel) {
mysids[mynel++] = sid;
} else {
+ rc = -ENOMEM;
maxnel += SIDS_NEL;
mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC);
- if (!mysids2) {
- rc = -ENOMEM;
+ if (!mysids2)
goto out_unlock;
- }
memcpy(mysids2, mysids, mynel * sizeof(*mysids2));
kfree(mysids);
mysids = mysids2;
}
}
}
-
+ rc = 0;
out_unlock:
read_unlock(&policy_rwlock);
if (rc || !mynel) {
goto out;
}
+ rc = -ENOMEM;
mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL);
if (!mysids2) {
- rc = -ENOMEM;
kfree(mysids);
goto out;
}
for (i = 0, j = 0; i < mynel; i++) {
rc = avc_has_perm_noaudit(fromsid, mysids[i],
- SECCLASS_PROCESS,
+ SECCLASS_PROCESS, /* kernel value */
PROCESS__TRANSITION, AVC_STRICT,
NULL);
if (!rc)
*/
int security_genfs_sid(const char *fstype,
char *path,
- u16 sclass,
+ u16 orig_sclass,
u32 *sid)
{
int len;
+ u16 sclass;
struct genfs *genfs;
struct ocontext *c;
- int rc = 0, cmp = 0;
+ int rc, cmp = 0;
while (path[0] == '/' && path[1] == '/')
path++;
read_lock(&policy_rwlock);
+ sclass = unmap_class(orig_sclass);
+ *sid = SECINITSID_UNLABELED;
+
for (genfs = policydb.genfs; genfs; genfs = genfs->next) {
cmp = strcmp(fstype, genfs->fstype);
if (cmp <= 0)
break;
}
- if (!genfs || cmp) {
- *sid = SECINITSID_UNLABELED;
- rc = -ENOENT;
+ rc = -ENOENT;
+ if (!genfs || cmp)
goto out;
- }
for (c = genfs->head; c; c = c->next) {
len = strlen(c->u.name);
break;
}
- if (!c) {
- *sid = SECINITSID_UNLABELED;
- rc = -ENOENT;
+ rc = -ENOENT;
+ if (!c)
goto out;
- }
if (!c->sid[0]) {
- rc = sidtab_context_to_sid(&sidtab,
- &c->context[0],
- &c->sid[0]);
+ rc = sidtab_context_to_sid(&sidtab, &c->context[0], &c->sid[0]);
if (rc)
goto out;
}
*sid = c->sid[0];
+ rc = 0;
out:
read_unlock(&policy_rwlock);
return rc;
if (c) {
*behavior = c->v.behavior;
if (!c->sid[0]) {
- rc = sidtab_context_to_sid(&sidtab,
- &c->context[0],
+ rc = sidtab_context_to_sid(&sidtab, &c->context[0],
&c->sid[0]);
if (rc)
goto out;
int security_get_bools(int *len, char ***names, int **values)
{
- int i, rc = -ENOMEM;
+ int i, rc;
read_lock(&policy_rwlock);
*names = NULL;
*values = NULL;
+ rc = 0;
*len = policydb.p_bools.nprim;
- if (!*len) {
- rc = 0;
+ if (!*len)
goto out;
- }
- *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC);
+ rc = -ENOMEM;
+ *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC);
if (!*names)
goto err;
- *values = kcalloc(*len, sizeof(int), GFP_ATOMIC);
+ rc = -ENOMEM;
+ *values = kcalloc(*len, sizeof(int), GFP_ATOMIC);
if (!*values)
goto err;
for (i = 0; i < *len; i++) {
size_t name_len;
+
(*values)[i] = policydb.bool_val_to_struct[i]->state;
name_len = strlen(policydb.p_bool_val_to_name[i]) + 1;
- (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC);
+
+ rc = -ENOMEM;
+ (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC);
if (!(*names)[i])
goto err;
+
strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len);
(*names)[i][name_len - 1] = 0;
}
int security_set_bools(int len, int *values)
{
- int i, rc = 0;
+ int i, rc;
int lenp, seqno = 0;
struct cond_node *cur;
write_lock_irq(&policy_rwlock);
+ rc = -EFAULT;
lenp = policydb.p_bools.nprim;
- if (len != lenp) {
- rc = -EFAULT;
+ if (len != lenp)
goto out;
- }
for (i = 0; i < len; i++) {
if (!!values[i] != policydb.bool_val_to_struct[i]->state) {
policydb.bool_val_to_struct[i]->state = 0;
}
- for (cur = policydb.cond_list; cur != NULL; cur = cur->next) {
+ for (cur = policydb.cond_list; cur; cur = cur->next) {
rc = evaluate_cond_node(&policydb, cur);
if (rc)
goto out;
}
seqno = ++latest_granting;
-
+ rc = 0;
out:
write_unlock_irq(&policy_rwlock);
if (!rc) {
avc_ss_reset(seqno);
selnl_notify_policyload(seqno);
+ selinux_status_update_policyload(seqno);
selinux_xfrm_notify_policyload();
}
return rc;
int security_get_bool_value(int bool)
{
- int rc = 0;
+ int rc;
int len;
read_lock(&policy_rwlock);
+ rc = -EFAULT;
len = policydb.p_bools.nprim;
- if (bool >= len) {
- rc = -EFAULT;
+ if (bool >= len)
goto out;
- }
rc = policydb.bool_val_to_struct[bool]->state;
out:
if (booldatum)
booldatum->state = bvalues[i];
}
- for (cur = p->cond_list; cur != NULL; cur = cur->next) {
+ for (cur = p->cond_list; cur; cur = cur->next) {
rc = evaluate_cond_node(p, cur);
if (rc)
goto out;
struct context newcon;
char *s;
u32 len;
- int rc = 0;
+ int rc;
- if (!ss_initialized || !selinux_mls_enabled) {
+ rc = 0;
+ if (!ss_initialized || !policydb.mls_enabled) {
*new_sid = sid;
goto out;
}
context_init(&newcon);
read_lock(&policy_rwlock);
+
+ rc = -EINVAL;
context1 = sidtab_search(&sidtab, sid);
if (!context1) {
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
__func__, sid);
- rc = -EINVAL;
goto out_unlock;
}
+ rc = -EINVAL;
context2 = sidtab_search(&sidtab, mls_sid);
if (!context2) {
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
__func__, mls_sid);
- rc = -EINVAL;
goto out_unlock;
}
/* Check the validity of the new context. */
if (!policydb_context_isvalid(&policydb, &newcon)) {
rc = convert_context_handle_invalid_context(&newcon);
- if (rc)
- goto bad;
+ 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);
+ kfree(s);
+ }
+ goto out_unlock;
+ }
}
rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid);
- goto out_unlock;
-
-bad:
- 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);
- kfree(s);
- }
-
out_unlock:
read_unlock(&policy_rwlock);
context_destroy(&newcon);
struct context *nlbl_ctx;
struct context *xfrm_ctx;
+ *peer_sid = SECSID_NULL;
+
/* handle the common (which also happens to be the set of easy) cases
* right away, these two if statements catch everything involving a
* single or absent peer SID/label */
/* we don't need to check ss_initialized here since the only way both
* nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the
* security server was initialized and ss_initialized was true */
- if (!selinux_mls_enabled) {
- *peer_sid = SECSID_NULL;
+ if (!policydb.mls_enabled)
return 0;
- }
read_lock(&policy_rwlock);
+ rc = -EINVAL;
nlbl_ctx = sidtab_search(&sidtab, nlbl_sid);
if (!nlbl_ctx) {
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
__func__, nlbl_sid);
- rc = -EINVAL;
- goto out_slowpath;
+ goto out;
}
+ rc = -EINVAL;
xfrm_ctx = sidtab_search(&sidtab, xfrm_sid);
if (!xfrm_ctx) {
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
__func__, xfrm_sid);
- rc = -EINVAL;
- goto out_slowpath;
+ goto out;
}
rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES);
+ if (rc)
+ goto out;
-out_slowpath:
+ /* at present NetLabel SIDs/labels really only carry MLS
+ * information so if the MLS portion of the NetLabel SID
+ * matches the MLS portion of the labeled XFRM SID/label
+ * then pass along the XFRM SID as it is the most
+ * expressive */
+ *peer_sid = xfrm_sid;
+out:
read_unlock(&policy_rwlock);
- if (rc == 0)
- /* at present NetLabel SIDs/labels really only carry MLS
- * information so if the MLS portion of the NetLabel SID
- * matches the MLS portion of the labeled XFRM SID/label
- * then pass along the XFRM SID as it is the most
- * expressive */
- *peer_sid = xfrm_sid;
- else
- *peer_sid = SECSID_NULL;
return rc;
}
int security_get_classes(char ***classes, int *nclasses)
{
- int rc = -ENOMEM;
+ int rc;
read_lock(&policy_rwlock);
+ rc = -ENOMEM;
*nclasses = policydb.p_classes.nprim;
- *classes = kcalloc(*nclasses, sizeof(*classes), GFP_ATOMIC);
+ *classes = kcalloc(*nclasses, sizeof(**classes), GFP_ATOMIC);
if (!*classes)
goto out;
rc = hashtab_map(policydb.p_classes.table, get_classes_callback,
*classes);
- if (rc < 0) {
+ if (rc) {
int i;
for (i = 0; i < *nclasses; i++)
kfree((*classes)[i]);
int security_get_permissions(char *class, char ***perms, int *nperms)
{
- int rc = -ENOMEM, i;
+ int rc, i;
struct class_datum *match;
read_lock(&policy_rwlock);
+ rc = -EINVAL;
match = hashtab_search(policydb.p_classes.table, class);
if (!match) {
printk(KERN_ERR "SELinux: %s: unrecognized class %s\n",
__func__, class);
- rc = -EINVAL;
goto out;
}
+ rc = -ENOMEM;
*nperms = match->permissions.nprim;
- *perms = kcalloc(*nperms, sizeof(*perms), GFP_ATOMIC);
+ *perms = kcalloc(*nperms, sizeof(**perms), GFP_ATOMIC);
if (!*perms)
goto out;
if (match->comdatum) {
rc = hashtab_map(match->comdatum->permissions.table,
get_permissions_callback, *perms);
- if (rc < 0)
+ if (rc)
goto err;
}
rc = hashtab_map(match->permissions.table, get_permissions_callback,
*perms);
- if (rc < 0)
+ if (rc)
goto err;
out:
case AUDIT_OBJ_ROLE:
case AUDIT_OBJ_TYPE:
/* only 'equals' and 'not equals' fit user, role, and type */
- if (op != AUDIT_EQUAL && op != AUDIT_NOT_EQUAL)
+ if (op != Audit_equal && op != Audit_not_equal)
return -EINVAL;
break;
case AUDIT_SUBJ_SEN:
switch (field) {
case AUDIT_SUBJ_USER:
case AUDIT_OBJ_USER:
+ rc = -EINVAL;
userdatum = hashtab_search(policydb.p_users.table, rulestr);
if (!userdatum)
- rc = -EINVAL;
- else
- tmprule->au_ctxt.user = userdatum->value;
+ goto out;
+ tmprule->au_ctxt.user = userdatum->value;
break;
case AUDIT_SUBJ_ROLE:
case AUDIT_OBJ_ROLE:
+ rc = -EINVAL;
roledatum = hashtab_search(policydb.p_roles.table, rulestr);
if (!roledatum)
- rc = -EINVAL;
- else
- tmprule->au_ctxt.role = roledatum->value;
+ goto out;
+ tmprule->au_ctxt.role = roledatum->value;
break;
case AUDIT_SUBJ_TYPE:
case AUDIT_OBJ_TYPE:
+ rc = -EINVAL;
typedatum = hashtab_search(policydb.p_types.table, rulestr);
if (!typedatum)
- rc = -EINVAL;
- else
- tmprule->au_ctxt.type = typedatum->value;
+ goto out;
+ tmprule->au_ctxt.type = typedatum->value;
break;
case AUDIT_SUBJ_SEN:
case AUDIT_SUBJ_CLR:
case AUDIT_OBJ_LEV_LOW:
case AUDIT_OBJ_LEV_HIGH:
rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC);
+ if (rc)
+ goto out;
break;
}
-
+ rc = 0;
+out:
read_unlock(&policy_rwlock);
if (rc) {
case AUDIT_SUBJ_USER:
case AUDIT_OBJ_USER:
switch (op) {
- case AUDIT_EQUAL:
+ case Audit_equal:
match = (ctxt->user == rule->au_ctxt.user);
break;
- case AUDIT_NOT_EQUAL:
+ case Audit_not_equal:
match = (ctxt->user != rule->au_ctxt.user);
break;
}
case AUDIT_SUBJ_ROLE:
case AUDIT_OBJ_ROLE:
switch (op) {
- case AUDIT_EQUAL:
+ case Audit_equal:
match = (ctxt->role == rule->au_ctxt.role);
break;
- case AUDIT_NOT_EQUAL:
+ case Audit_not_equal:
match = (ctxt->role != rule->au_ctxt.role);
break;
}
case AUDIT_SUBJ_TYPE:
case AUDIT_OBJ_TYPE:
switch (op) {
- case AUDIT_EQUAL:
+ case Audit_equal:
match = (ctxt->type == rule->au_ctxt.type);
break;
- case AUDIT_NOT_EQUAL:
+ case Audit_not_equal:
match = (ctxt->type != rule->au_ctxt.type);
break;
}
field == AUDIT_OBJ_LEV_LOW) ?
&ctxt->range.level[0] : &ctxt->range.level[1]);
switch (op) {
- case AUDIT_EQUAL:
+ case Audit_equal:
match = mls_level_eq(&rule->au_ctxt.range.level[0],
level);
break;
- case AUDIT_NOT_EQUAL:
+ case Audit_not_equal:
match = !mls_level_eq(&rule->au_ctxt.range.level[0],
level);
break;
- case AUDIT_LESS_THAN:
+ case Audit_lt:
match = (mls_level_dom(&rule->au_ctxt.range.level[0],
level) &&
!mls_level_eq(&rule->au_ctxt.range.level[0],
level));
break;
- case AUDIT_LESS_THAN_OR_EQUAL:
+ case Audit_le:
match = mls_level_dom(&rule->au_ctxt.range.level[0],
level);
break;
- case AUDIT_GREATER_THAN:
+ case Audit_gt:
match = (mls_level_dom(level,
&rule->au_ctxt.range.level[0]) &&
!mls_level_eq(level,
&rule->au_ctxt.range.level[0]));
break;
- case AUDIT_GREATER_THAN_OR_EQUAL:
+ case Audit_ge:
match = mls_level_dom(level,
&rule->au_ctxt.range.level[0]);
break;
int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
u32 *sid)
{
- int rc = -EIDRM;
+ int rc;
struct context *ctx;
struct context ctx_new;
read_lock(&policy_rwlock);
- if (secattr->flags & NETLBL_SECATTR_CACHE) {
+ if (secattr->flags & NETLBL_SECATTR_CACHE)
*sid = *(u32 *)secattr->cache->data;
- rc = 0;
- } else if (secattr->flags & NETLBL_SECATTR_SECID) {
+ else if (secattr->flags & NETLBL_SECATTR_SECID)
*sid = secattr->attr.secid;
- rc = 0;
- } else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) {
+ else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) {
+ rc = -EIDRM;
ctx = sidtab_search(&sidtab, SECINITSID_NETMSG);
if (ctx == NULL)
- goto netlbl_secattr_to_sid_return;
+ goto out;
+ context_init(&ctx_new);
ctx_new.user = ctx->user;
ctx_new.role = ctx->role;
ctx_new.type = ctx->type;
mls_import_netlbl_lvl(&ctx_new, secattr);
if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {
- if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat,
- secattr->attr.mls.cat) != 0)
- goto netlbl_secattr_to_sid_return;
- ctx_new.range.level[1].cat.highbit =
- ctx_new.range.level[0].cat.highbit;
- ctx_new.range.level[1].cat.node =
- ctx_new.range.level[0].cat.node;
- } else {
- ebitmap_init(&ctx_new.range.level[0].cat);
- ebitmap_init(&ctx_new.range.level[1].cat);
+ rc = ebitmap_netlbl_import(&ctx_new.range.level[0].cat,
+ secattr->attr.mls.cat);
+ if (rc)
+ goto out;
+ memcpy(&ctx_new.range.level[1].cat,
+ &ctx_new.range.level[0].cat,
+ sizeof(ctx_new.range.level[0].cat));
}
- if (mls_context_isvalid(&policydb, &ctx_new) != 1)
- goto netlbl_secattr_to_sid_return_cleanup;
+ rc = -EIDRM;
+ if (!mls_context_isvalid(&policydb, &ctx_new))
+ goto out_free;
rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid);
- if (rc != 0)
- goto netlbl_secattr_to_sid_return_cleanup;
+ if (rc)
+ goto out_free;
security_netlbl_cache_add(secattr, *sid);
ebitmap_destroy(&ctx_new.range.level[0].cat);
- } else {
+ } else
*sid = SECSID_NULL;
- rc = 0;
- }
-netlbl_secattr_to_sid_return:
read_unlock(&policy_rwlock);
- return rc;
-netlbl_secattr_to_sid_return_cleanup:
+ return 0;
+out_free:
ebitmap_destroy(&ctx_new.range.level[0].cat);
- goto netlbl_secattr_to_sid_return;
+out:
+ read_unlock(&policy_rwlock);
+ return rc;
}
/**
*/
int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr)
{
- int rc = -ENOENT;
+ int rc;
struct context *ctx;
if (!ss_initialized)
return 0;
read_lock(&policy_rwlock);
+
+ rc = -ENOENT;
ctx = sidtab_search(&sidtab, sid);
if (ctx == NULL)
- goto netlbl_sid_to_secattr_failure;
+ goto out;
+
+ rc = -ENOMEM;
secattr->domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1],
GFP_ATOMIC);
- secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY;
+ if (secattr->domain == NULL)
+ goto out;
+
+ secattr->attr.secid = sid;
+ secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID;
mls_export_netlbl_lvl(ctx, secattr);
rc = mls_export_netlbl_cat(ctx, secattr);
- if (rc != 0)
- goto netlbl_sid_to_secattr_failure;
+out:
read_unlock(&policy_rwlock);
+ return rc;
+}
+#endif /* CONFIG_NETLABEL */
- return 0;
+/**
+ * security_read_policy - read the policy.
+ * @data: binary policy data
+ * @len: length of data in bytes
+ *
+ */
+int security_read_policy(void **data, ssize_t *len)
+{
+ int rc;
+ struct policy_file fp;
-netlbl_sid_to_secattr_failure:
+ if (!ss_initialized)
+ return -EINVAL;
+
+ *len = security_policydb_len();
+
+ *data = vmalloc_user(*len);
+ if (!*data)
+ return -ENOMEM;
+
+ fp.data = *data;
+ fp.len = *len;
+
+ read_lock(&policy_rwlock);
+ rc = policydb_write(&policydb, &fp);
read_unlock(&policy_rwlock);
- return rc;
+
+ if (rc)
+ return rc;
+
+ *len = (unsigned long)fp.data - (unsigned long)*data;
+ return 0;
+
}
-#endif /* CONFIG_NETLABEL */
projects / linux-flexiantxendom0-natty.git / blobdiff