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libsepol/cil: Validate extended avrules and permissionxs

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Classes used in extended avrules and permissionxs must have an "ioctl"
permission. Add validation to ensure that is the case, or print an error
message otherwise.

Signed-off-by: Steve Lawrence <slawrence@tresys.com>
This commit is contained in:
Steve Lawrence 2015-12-07 11:00:44 -05:00 committed by James Carter
parent a2a3c6d03f
commit f610cac79a
1 changed files with 60 additions and 0 deletions
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60
libsepol/cil/src/cil_verify.c
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@ -43,6 +43,7 @@
#include "cil_mem.h"
#include "cil_tree.h"
#include "cil_list.h"
#include "cil_find.h"
#include "cil_verify.h"
@ -1226,6 +1227,59 @@ exit:
return rc;
}
int __cil_verify_permissionx(struct cil_permissionx *permx, struct cil_tree_node *node)
{
int rc;
struct cil_list *classes = NULL;
struct cil_list_item *item;
struct cil_class *class;
struct cil_symtab_datum *perm_datum;
char *kind_str;
switch (permx->kind) {
case CIL_PERMX_KIND_IOCTL:
kind_str = CIL_KEY_IOCTL;
break;
default:
cil_log(CIL_ERR, "Invalid permissionx kind (%d) at line %d of %s\n", permx->kind, node->line, node->path);
rc = SEPOL_ERR;
goto exit;
}
classes = cil_expand_class(permx->obj);
cil_list_for_each(item, classes) {
class = item->data;
rc = cil_symtab_get_datum(&class->perms, kind_str, &perm_datum);
if (rc == SEPOL_ENOENT) {
if (class->common != NULL) {
rc = cil_symtab_get_datum(&class->common->perms, kind_str, &perm_datum);
}
if (rc == SEPOL_ENOENT) {
cil_log(CIL_ERR, "Invalid permissionx at line %d of %s: %s is not a permission of class %s\n", node->line, node->path, kind_str, class->datum.name);
rc = SEPOL_ERR;
goto exit;
}
}
}
rc = SEPOL_OK;
exit:
if (classes != NULL) {
cil_list_destroy(&classes, CIL_FALSE);
}
return rc;
}
int __cil_verify_avrulex(struct cil_tree_node *node)
{
struct cil_avrule *avrulex = node->data;
return __cil_verify_permissionx(avrulex->perms.x.permx, node);
}
int __cil_verify_class(struct cil_tree_node *node)
{
int rc = SEPOL_ERR;
@ -1420,6 +1474,12 @@ int __cil_verify_helper(struct cil_tree_node *node, uint32_t *finished, void *ex
case CIL_FSUSE:
rc = __cil_verify_fsuse(db, node);
break;
case CIL_AVRULEX:
rc = __cil_verify_avrulex(node);
break;
case CIL_PERMISSIONX:
rc = __cil_verify_permissionx(node->data, node);
break;
case CIL_RANGETRANSITION:
rc = SEPOL_OK;
break;