RepoMirrors/selinux
1
0
Fork 0
mirror of https://github.com/SELinuxProject/selinux synced 2024-12-15 18:44:40 +00:00
Code Issues Packages Projects Releases Wiki Activity

libsepol/cil: Cleanup neverallow checking and fail if bounds checking fails

Browse Source 
For both neverallow and bounds checking keep neverallow and bounds
failures separate from program faults.

Have secilc exit with an error (and fail to build a binary policy)
when bounds checks fail.

Signed-off-by: James Carter <jwcart2@tycho.nsa.gov>
This commit is contained in:
James Carter 2016-04-13 13:42:08 -04:00
parent a7604ba7eb
commit acd61984df
1 changed files with 28 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
libsepol/cil/src/cil_binary.c
View File

@ -4383,10 +4383,9 @@ exit:
return rc;
}
static int cil_check_neverallow(const struct cil_db *db, policydb_t *pdb, struct cil_tree_node *node)
static int cil_check_neverallow(const struct cil_db *db, policydb_t *pdb, struct cil_tree_node *node, int *violation)
{
int rc = SEPOL_ERR;
int ret = CIL_FALSE;
int rc = SEPOL_OK;
struct cil_avrule *cil_rule = node->data;
struct cil_symtab_datum *tgt = cil_rule->tgt;
uint32_t kind;
@ -4425,11 +4424,11 @@ static int cil_check_neverallow(const struct cil_db *db, policydb_t *pdb, struct
rc = check_assertion(pdb, rule);
if (rc == CIL_TRUE) {
*violation = CIL_TRUE;
rc = __cil_print_neverallow_failure(db, node);
if (rc != SEPOL_OK) {
goto exit;
}
ret = CIL_TRUE;
}
} else {
@ -4447,12 +4446,11 @@ static int cil_check_neverallow(const struct cil_db *db, policydb_t *pdb, struct
rule->xperms = item->data;
rc = check_assertion(pdb, rule);
if (rc == CIL_TRUE) {
*violation = CIL_TRUE;
rc = __cil_print_neverallow_failure(db, node);
if (rc != SEPOL_OK) {
goto exit;
}
ret = CIL_TRUE;
goto exit;
}
}
}
@ -4469,34 +4467,23 @@ exit:
rule->xperms = NULL;
__cil_destroy_sepol_avrules(rule);
if (rc) {
return rc;
} else {
return ret;
}
return rc;
}
static int cil_check_neverallows(const struct cil_db *db, policydb_t *pdb, struct cil_list *neverallows)
static int cil_check_neverallows(const struct cil_db *db, policydb_t *pdb, struct cil_list *neverallows, int *violation)
{
int rc = SEPOL_OK;
int ret = CIL_FALSE;
struct cil_list_item *item;
cil_list_for_each(item, neverallows) {
rc = cil_check_neverallow(db, pdb, item->data);
if (rc < 0) {
rc = cil_check_neverallow(db, pdb, item->data, violation);
if (rc != SEPOL_OK) {
goto exit;
} else if (rc > 0) {
ret = CIL_TRUE;
}
}
exit:
if (rc || ret) {
return SEPOL_ERR;
} else {
return SEPOL_OK;
}
return rc;
}
static struct cil_list *cil_classperms_from_sepol(policydb_t *pdb, uint16_t class, uint32_t data, struct cil_class *class_value_to_cil[], struct cil_perm **perm_value_to_cil[])
@ -4551,7 +4538,7 @@ exit:
return rc;
}
static int cil_check_type_bounds(const struct cil_db *db, policydb_t *pdb, void *type_value_to_cil, struct cil_class *class_value_to_cil[], struct cil_perm **perm_value_to_cil[])
static int cil_check_type_bounds(const struct cil_db *db, policydb_t *pdb, void *type_value_to_cil, struct cil_class *class_value_to_cil[], struct cil_perm **perm_value_to_cil[], int *violation)
{
int rc = SEPOL_OK;
int i;
@ -4579,6 +4566,8 @@ static int cil_check_type_bounds(const struct cil_db *db, policydb_t *pdb, void
struct cil_avrule target;
struct cil_tree_node *n1 = NULL;
*violation = CIL_TRUE;
target.is_extended = 0;
target.rule_kind = CIL_AVRULE_ALLOWED;
target.src_str = NULL;
@ -4759,20 +4748,32 @@ int cil_binary_create_allocated_pdb(const struct cil_db *db, sepol_policydb_t *p
__cil_set_conditional_state_and_flags(pdb);
if (db->disable_neverallow != CIL_TRUE) {
int violation = CIL_FALSE;
cil_log(CIL_INFO, "Checking Neverallows\n");
rc = cil_check_neverallows(db, pdb, neverallows);
rc = cil_check_neverallows(db, pdb, neverallows, &violation);
if (rc != SEPOL_OK) goto exit;
cil_log(CIL_INFO, "Checking User Bounds\n");
bounds_check_users(NULL, pdb);
rc = bounds_check_users(NULL, pdb);
if (rc) {
violation = CIL_TRUE;
}
cil_log(CIL_INFO, "Checking Role Bounds\n");
bounds_check_roles(NULL, pdb);
rc = bounds_check_roles(NULL, pdb);
if (rc) {
violation = CIL_TRUE;
}
cil_log(CIL_INFO, "Checking Type Bounds\n");
rc = cil_check_type_bounds(db, pdb, type_value_to_cil, class_value_to_cil, perm_value_to_cil);
rc = cil_check_type_bounds(db, pdb, type_value_to_cil, class_value_to_cil, perm_value_to_cil, &violation);
if (rc != SEPOL_OK) goto exit;
if (violation == CIL_TRUE) {
rc = SEPOL_ERR;
goto exit;
}
}
rc = SEPOL_OK;