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libsepol: Report all neverallow violations.

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Switch libsepol check_assertions() from only reporting the first violation
to reporting them all.

Change-Id: I45b3502ff96b1d093574e1fecff93a582f8d00bd
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: Steve Lawrence <slawrence@tresys.com>
This commit is contained in:
Stephen Smalley 2014-10-14 13:51:25 -04:00
parent 877acdb31f
commit 9da070f700
1 changed files with 52 additions and 47 deletions
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99
libsepol/src/assertion.c
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@ -27,38 +27,12 @@
#include "debug.h"
static int check_assertion_helper(sepol_handle_t * handle,
policydb_t * p,
avtab_t * te_avtab, avtab_t * te_cond_avtab,
unsigned int stype, unsigned int ttype,
avrule_t * avrule)
static void report_failure(sepol_handle_t *handle, policydb_t *p,
const avrule_t * avrule,
unsigned int stype, unsigned int ttype,
const class_perm_node_t *curperm,
const avtab_ptr_t node)
{
avtab_key_t avkey;
avtab_ptr_t node;
class_perm_node_t *curperm;
for (curperm = avrule->perms; curperm != NULL; curperm = curperm->next) {
avkey.source_type = stype + 1;
avkey.target_type = ttype + 1;
avkey.target_class = curperm->class;
avkey.specified = AVTAB_ALLOWED;
for (node = avtab_search_node(te_avtab, &avkey);
node != NULL;
node = avtab_search_node_next(node, avkey.specified)) {
if (node->datum.data & curperm->data)
goto err;
}
for (node = avtab_search_node(te_cond_avtab, &avkey);
node != NULL;
node = avtab_search_node_next(node, avkey.specified)) {
if (node->datum.data & curperm->data)
goto err;
}
}
return 0;
err:
if (avrule->source_filename) {
ERR(handle, "neverallow on line %lu of %s (or line %lu of policy.conf) violated by allow %s %s:%s {%s };",
avrule->source_line, avrule->source_filename, avrule->line,
@ -76,13 +50,49 @@ static int check_assertion_helper(sepol_handle_t * handle,
node->datum.data & curperm->data));
} else {
ERR(handle, "neverallow violated by allow %s %s:%s {%s };",
p->p_type_val_to_name[stype],
p->p_type_val_to_name[stype],
p->p_type_val_to_name[ttype],
p->p_class_val_to_name[curperm->class - 1],
sepol_av_to_string(p, curperm->class,
node->datum.data & curperm->data));
}
return -1;
}
static unsigned long check_assertion_helper(sepol_handle_t * handle,
policydb_t * p,
avtab_t * te_avtab, avtab_t * te_cond_avtab,
unsigned int stype, unsigned int ttype,
const avrule_t * avrule)
{
avtab_key_t avkey;
avtab_ptr_t node;
class_perm_node_t *curperm;
unsigned long errors = 0;
for (curperm = avrule->perms; curperm != NULL; curperm = curperm->next) {
avkey.source_type = stype + 1;
avkey.target_type = ttype + 1;
avkey.target_class = curperm->class;
avkey.specified = AVTAB_ALLOWED;
for (node = avtab_search_node(te_avtab, &avkey);
node != NULL;
node = avtab_search_node_next(node, avkey.specified)) {
if (node->datum.data & curperm->data) {
report_failure(handle, p, avrule, stype, ttype, curperm, node);
errors++;
}
}
for (node = avtab_search_node(te_cond_avtab, &avkey);
node != NULL;
node = avtab_search_node_next(node, avkey.specified)) {
if (node->datum.data & curperm->data) {
report_failure(handle, p, avrule, stype, ttype, curperm, node);
errors++;
}
}
}
return errors;
}
int check_assertions(sepol_handle_t * handle, policydb_t * p,
@ -92,7 +102,7 @@ int check_assertions(sepol_handle_t * handle, policydb_t * p,
avtab_t te_avtab, te_cond_avtab;
ebitmap_node_t *snode, *tnode;
unsigned int i, j;
int rc;
unsigned long errors = 0;
if (!avrules) {
/* Since assertions are stored in avrules, if it is NULL
@ -127,31 +137,26 @@ int check_assertions(sepol_handle_t * handle, policydb_t * p,
if (!ebitmap_node_get_bit(snode, i))
continue;
if (a->flags & RULE_SELF) {
if (check_assertion_helper
errors += check_assertion_helper
(handle, p, &te_avtab, &te_cond_avtab, i, i,
a)) {
rc = -1;
goto out;
}
a);
}
ebitmap_for_each_bit(ttypes, tnode, j) {
if (!ebitmap_node_get_bit(tnode, j))
continue;
if (check_assertion_helper
errors += check_assertion_helper
(handle, p, &te_avtab, &te_cond_avtab, i, j,
a)) {
rc = -1;
goto out;
}
a);
}
}
}
rc = 0;
out:
if (errors)
ERR(handle, "%lu neverallow failures occurred", errors);
avtab_destroy(&te_avtab);
avtab_destroy(&te_cond_avtab);
return rc;
return errors ? -1 : 0;
oom:
ERR(handle, "Out of memory - unable to check neverallows");