Add tests for neverallow assertion checks.
This creates a foundation for the status quo, and enables to spot
regressions in future changes to the - quite complex - assertion logic.
One example is the support for not-self rules.
Signed-off-by: Christian Göttsche <cgzones@xxxxxxxxxxxxxx>
---
libsepol/tests/libsepol-tests.c | 2 +
.../policies/test-neverallow/policy.conf | 298 ++++++++++++++++++
libsepol/tests/test-neverallow.c | 172 ++++++++++
libsepol/tests/test-neverallow.h | 10 +
4 files changed, 482 insertions(+)
create mode 100644 libsepol/tests/policies/test-neverallow/policy.conf
create mode 100644 libsepol/tests/test-neverallow.c
create mode 100644 libsepol/tests/test-neverallow.h
diff --git a/libsepol/tests/libsepol-tests.c b/libsepol/tests/libsepol-tests.c
index 5ae6bedc..968e3cc2 100644
--- a/libsepol/tests/libsepol-tests.c
+++ b/libsepol/tests/libsepol-tests.c
@@ -24,6 +24,7 @@
#include "test-expander.h"
#include "test-deps.h"
#include "test-downgrade.h"
+#include "test-neverallow.h"
#include <CUnit/Basic.h>
#include <CUnit/Console.h>
@@ -71,6 +72,7 @@ static bool do_tests(int interactive, int verbose)
DECLARE_SUITE(expander);
DECLARE_SUITE(deps);
DECLARE_SUITE(downgrade);
+ DECLARE_SUITE(neverallow);
if (verbose)
CU_basic_set_mode(CU_BRM_VERBOSE);
diff --git a/libsepol/tests/policies/test-neverallow/policy.conf b/libsepol/tests/policies/test-neverallow/policy.conf
new file mode 100644
index 00000000..67a16372
--- /dev/null
+++ b/libsepol/tests/policies/test-neverallow/policy.conf
@@ -0,0 +1,298 @@
+class process
+class blk_file
+class chr_file
+class dir
+class fifo_file
+class file
+class lnk_file
+class sock_file
+
+sid kernel
+sid security
+sid unlabeled
+sid file
+sid port
+sid netif
+sid netmsg
+sid node
+sid devnull
+
+class process { dyntransition transition }
+class file { getattr ioctl open read write }
+
+ifdef(`enable_mls',`
+sensitivity s0;
+dominance { s0 }
+category c0; category c1; category c2; category c3;
+category c4; category c5; category c6; category c7;
+category c8; category c9; category c10; category c11;
+category c12; category c13; category c14; category c15;
+category c16; category c17; category c18; category c19;
+category c20; category c21; category c22; category c23;
+
+level s0:c0.c23;
+
+mlsconstrain file { write } ( h1 dom h2 );
+')
+
+
+########################################
+#
+# Test start
+#
+########################################
+
+
+## Test 1 (basic)
+
+type test1_t;
+allow test1_t test1_t : file { read write };
+neverallow test1_t test1_t : file read;
+
+
+## Test 2 (wildcard permission)
+
+type test2_t;
+allow test2_t test2_t : file { read write };
+neverallow test2_t test2_t : file *;
+
+
+## Test 3 (complement permission)
+
+type test3_t;
+allow test3_t test3_t : file { read write };
+neverallow test3_t test3_t : file ~{ write };
+
+
+## Test 4 (wildcard source)
+
+type test4_t;
+allow test4_t test4_t : file { read write };
+neverallow * test4_t : file read;
+
+
+## Test 5 (wildcard target)
+
+type test5_t;
+allow test5_t test5_t : file { read write };
+neverallow test5_t * : file read;
+
+
+## Test 6 (complement source)
+
+type test6_1_t;
+type test6_2_t;
+allow { test6_1_t test6_2_t } { test6_1_t test6_2_t } : file { read write };
+neverallow ~{ test6_2_t } test6_1_t : file read;
+
+
+## Test 7 (complement target)
+
+type test7_1_t;
+type test7_2_t;
+allow { test7_1_t test7_2_t } { test7_1_t test7_2_t } : file { read write };
+neverallow test7_1_t ~{ test7_2_t } : file read;
+
+
+## Test 8 (source attribute)
+
+attribute test8_a;
+type test8_t, test8_a;
+allow test8_a test8_a : file read;
+allow test8_t test8_t : file write;
+neverallow test8_a test8_t : file { read write };
+
+
+## Test 9 (target attribute)
+
+attribute test9_a;
+type test9_t, test9_a;
+allow test9_a test9_a : file read;
+allow test9_t test9_t : file write;
+neverallow test9_t test9_a : file { read write };
+
+
+## Test 10 (self)
+
+attribute test10_a;
+type test10_1_t, test10_a;
+type test10_2_t;
+allow { test10_1_t test10_2_t } { test10_1_t test10_2_t } : file read;
+neverallow test10_a self : file *;
+
+
+## Test 11 (wildcard)
+
+type test11_t;
+allow test11_t self : process *;
+neverallow * * : process *;
+
+
+## Test 12 (complement attributes)
+
+attribute test12_1_a;
+attribute test12_2_a;
+attribute test12_3_a;
+type test12_1_t, test12_1_a;
+type test12_2_t, test12_2_a;
+type test12_3_t, test12_3_a;
+allow { test12_1_a test12_2_a test12_3_a } { test12_1_a test12_2_a test12_3_a } : file *;
+neverallow ~{ test12_1_a test12_2_t } ~{ test12_3_a } : file getattr;
+neverallow ~{ test12_1_a } ~{ test12_2_a test12_3_t } : file open;
+
+
+## Test 13 (excludes)
+
+attribute test13_1_a;
+attribute test13_2_a;
+attribute test13_3_a;
+type test13_1_t, test13_1_a;
+type test13_2_t, test13_2_a;
+type test13_3_t, test13_3_a;
+allow { test13_1_a test13_2_a test13_3_a } { test13_1_a test13_2_a test13_3_a } : file { read write };
+neverallow { test13_1_a test13_2_a test13_3_a -test13_2_a -test13_3_t } { test13_1_a test13_2_a test13_3_a -test13_2_t -test13_3_a } : file read;
+
+
+## Test 14 (misc avrules)
+
+type test14_t;
+auditallow test14_t test14_t : file read;
+dontaudit test14_t test14_t : file write;
+neverallow test14_t test14_t : file { read write };
+type_transition test14_t test14_t : file test14_t;
+type_transition test14_t test14_t : file test14_t "objname";
+neverallow test14_t test14_t : file *; # nofail
+
+
+## Test 15 (extended permissions - standard allow)
+
+type test15_t;
+allow test15_t self : file ioctl;
+neverallowxperm test15_t self : file ioctl 0x1111;
+
+
+## Test 16 (extended permissions - allowxperm)
+
+type test16_t;
+allow test16_t self : file ioctl;
+allowxperm test16_t self : file ioctl 0x1111;
+neverallowxperm test16_t self : file ioctl 0x1111;
+
+
+## Test 17 (extended permissions - allowxperm mismatch)
+
+type test17_t;
+allow test17_t self : file ioctl;
+allowxperm test17_t self : file ioctl 0x1111;
+neverallowxperm test17_t self : file ioctl 0x2222; # nofail
+
+
+## Test 18 (extended permissions - allowxperm range I)
+
+type test18_t;
+allow test18_t self : file ioctl;
+allowxperm test18_t self : file ioctl { 0x1100-0x1300 };
+neverallowxperm test18_t self : file ioctl 0x1111;
+
+
+## Test 19 (extended permissions - allowxperm range II)
+
+type test19_t;
+allow test19_t self : file ioctl;
+allowxperm test19_t self : file ioctl 0x1111;
+neverallowxperm test19_t self : file ioctl { 0x1100-0x1300 };
+
+
+## Test 20 (extended permissions - misc targets I)
+
+attribute test20_a;
+type test20_t, test20_a;
+
+allow test20_a test20_a : file ioctl;
+allowxperm test20_a test20_a : file ioctl 0x1111;
+neverallowxperm test20_a self : file ioctl 0x1111;
+
+
+## Test 21 (extended permissions - misc targets II)
+
+attribute test21_1_a;
+attribute test21_2_a;
+type test21_t, test21_1_a, test21_2_a;
+
+allow test21_1_a test21_1_a : file ioctl;
+allowxperm test21_1_a test21_2_a : file ioctl 0x1111;
+neverallowxperm test21_1_a self : file ioctl 0x1111;
+
+
+## Test 22 (extended permissions - misc targets III)
+
+attribute test22_a;
+type test22_t, test22_a;
+
+allow test22_a test22_a : file ioctl;
+allowxperm test22_t self : file ioctl 0x1111;
+neverallowxperm test22_a self : file ioctl 0x1111;
+
+
+## Test 23 (extended permissions - misc targets IV)
+
+attribute test23_a;
+type test23_t, test23_a;
+
+allow test23_a test23_a : file ioctl;
+allowxperm test23_t test23_t : file ioctl 0x1111;
+neverallowxperm test23_a self : file ioctl 0x1111;
+
+
+## Test 24 (extended permissions - misc targets V)
+
+attribute test24_a;
+type test24_t, test24_a;
+
+allow test24_a test24_a : file ioctl;
+allowxperm test24_t test24_a : file ioctl 0x1111;
+neverallowxperm test24_a self : file ioctl 0x1111;
+
+
+## Test 25 (extended permissions - misc targets VI)
+
+attribute test25_a;
+type test25_t, test25_a;
+
+allow test25_a test25_a : file ioctl;
+allowxperm test25_a self : file ioctl 0x1111;
+neverallowxperm test25_a self : file ioctl 0x1111;
+
+
+## Test 26 (extended permissions - assert twice)
+
+attribute test26_a;
+type test26_1_t, test26_a;
+type test26_2_t, test26_a;
+allow test26_a test26_a : file ioctl;
+allowxperm test26_a test26_a : file ioctl 0x1111;
+neverallowxperm test26_1_t test26_a : file ioctl 0x1111;
+
+
+########################################
+#
+# Test End
+#
+########################################
+
+
+type sys_isid;
+role sys_role;
+role sys_role types sys_isid;
+gen_user(sys_user,, sys_role, s0, s0 - s0:c0.c23)
+sid kernel gen_context(sys_user:sys_role:sys_isid, s0)
+sid security gen_context(sys_user:sys_role:sys_isid, s0)
+sid unlabeled gen_context(sys_user:sys_role:sys_isid, s0)
+sid file gen_context(sys_user:sys_role:sys_isid, s0)
+sid port gen_context(sys_user:sys_role:sys_isid, s0)
+sid netif gen_context(sys_user:sys_role:sys_isid, s0)
+sid netmsg gen_context(sys_user:sys_role:sys_isid, s0)
+sid node gen_context(sys_user:sys_role:sys_isid, s0)
+sid devnull gen_context(sys_user:sys_role:sys_isid, s0)
+fs_use_trans devpts gen_context(sys_user:sys_role:sys_isid, s0);
+fs_use_trans devtmpfs gen_context(sys_user:sys_role:sys_isid, s0);
diff --git a/libsepol/tests/test-neverallow.c b/libsepol/tests/test-neverallow.c
new file mode 100644
index 00000000..d973a0e3
--- /dev/null
+++ b/libsepol/tests/test-neverallow.c
@@ -0,0 +1,172 @@
+#define _GNU_SOURCE /* vasprintf(3) */
+
+#include "test-neverallow.h"
+
+#include "helpers.h"
+#include "test-common.h"
+
+#include <sepol/debug.h>
+#include <sepol/policydb/link.h>
+#include <sepol/policydb/expand.h>
+
+#include <stdio.h>
+#include <stdarg.h>
+
+extern int mls;
+
+int neverallow_test_init(void)
+{
+ return 0;
+}
+
+int neverallow_test_cleanup(void)
+{
+ return 0;
+}
+
+static struct msg_list {
+ char *msg;
+ struct msg_list *next;
+} *messages;
+
+static void messages_clean(void)
+{
+ while (messages) {
+ struct msg_list *n = messages->next;
+ free(messages->msg);
+ free(messages);
+ messages = n;
+ }
+}
+
+static void messages_check(unsigned count, const char *const expected[count])
+{
+ unsigned i;
+ const struct msg_list *m = messages;
+
+ for (i = 0; i < count; i++, m = m->next) {
+ if (!m) {
+ CU_FAIL("less messages than expected");
+ fprintf(stderr, "\n<expected %u, got %u>\n", count, i);
+ return;
+ }
+
+ if (strcmp(expected[i], m->msg) != 0) {
+ CU_FAIL("messages differ from expected");
+ fprintf(stderr, "\n<expected: '''%s''', got: '''%s'''>\n", expected[i], m->msg);
+ }
+ }
+
+ if (m) {
+ CU_FAIL("more messages than expected");
+ fprintf(stderr, "\n<expected %u; next message: '''%s'''>\n", count, m->msg);
+ }
+}
+
+__attribute__ ((format(printf, 3, 4)))
+static void msg_handler(void *varg __attribute__ ((unused)),
+ sepol_handle_t * handle __attribute__ ((unused)),
+ const char *fmt, ...)
+{
+ char *msg;
+ va_list ap;
+ int r;
+
+ va_start(ap, fmt);
+ r = vasprintf(&msg, fmt, ap);
+ if (r < 0)
+ CU_FAIL_FATAL("oom");
+ va_end(ap);
+
+ struct msg_list *new = malloc(sizeof(*new));
+ if (!new)
+ CU_FAIL_FATAL("oom");
+ new->msg = msg;
+ new->next = messages;
+ messages = new;
+}
+
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof(*a))
+
+static void test_neverallow_basic(void)
+{
+ policydb_t basemod, base_expanded;
+ sepol_handle_t *handle;
+ static const char *const expected_messages[] = {
+ "30 neverallow failures occurred",
+ "neverallow on line 53 of policies/test-neverallow/policy.conf.std (or line 53 of policies/test-neverallow/policy.conf.std) violated by allow test1_t test1_t:file { read };",
+ "neverallow on line 60 of policies/test-neverallow/policy.conf.std (or line 60 of policies/test-neverallow/policy.conf.std) violated by allow test2_t test2_t:file { read write };",
+ "neverallow on line 67 of policies/test-neverallow/policy.conf.std (or line 67 of policies/test-neverallow/policy.conf.std) violated by allow test3_t test3_t:file { read };",
+ "neverallow on line 74 of policies/test-neverallow/policy.conf.std (or line 74 of policies/test-neverallow/policy.conf.std) violated by allow test4_t test4_t:file { read };",
+ "neverallow on line 81 of policies/test-neverallow/policy.conf.std (or line 81 of policies/test-neverallow/policy.conf.std) violated by allow test5_t test5_t:file { read };",
+ "neverallow on line 89 of policies/test-neverallow/policy.conf.std (or line 89 of policies/test-neverallow/policy.conf.std) violated by allow test6_1_t test6_1_t:file { read };",
+ "neverallow on line 97 of policies/test-neverallow/policy.conf.std (or line 97 of policies/test-neverallow/policy.conf.std) violated by allow test7_1_t test7_1_t:file { read };",
+ "neverallow on line 106 of policies/test-neverallow/policy.conf.std (or line 106 of policies/test-neverallow/policy.conf.std) violated by allow test8_t test8_t:file { write };",
+ "neverallow on line 106 of policies/test-neverallow/policy.conf.std (or line 106 of policies/test-neverallow/policy.conf.std) violated by allow test8_t test8_t:file { read };",
+ "neverallow on line 115 of policies/test-neverallow/policy.conf.std (or line 115 of policies/test-neverallow/policy.conf.std) violated by allow test9_t test9_t:file { read };",
+ "neverallow on line 115 of policies/test-neverallow/policy.conf.std (or line 115 of policies/test-neverallow/policy.conf.std) violated by allow test9_t test9_t:file { write };",
+ "neverallow on line 124 of policies/test-neverallow/policy.conf.std (or line 124 of policies/test-neverallow/policy.conf.std) violated by allow test10_1_t test10_1_t:file { read };",
+ "neverallow on line 131 of policies/test-neverallow/policy.conf.std (or line 131 of policies/test-neverallow/policy.conf.std) violated by allow test11_t test11_t:process { dyntransition transition };",
+ "neverallow on line 143 of policies/test-neverallow/policy.conf.std (or line 143 of policies/test-neverallow/policy.conf.std) violated by allow test12_3_t test12_1_t:file { getattr };",
+ "neverallow on line 143 of policies/test-neverallow/policy.conf.std (or line 143 of policies/test-neverallow/policy.conf.std) violated by allow test12_3_t test12_2_t:file { getattr };",
+ "neverallow on line 144 of policies/test-neverallow/policy.conf.std (or line 144 of policies/test-neverallow/policy.conf.std) violated by allow test12_3_t test12_1_t:file { open };",
+ "neverallow on line 144 of policies/test-neverallow/policy.conf.std (or line 144 of policies/test-neverallow/policy.conf.std) violated by allow test12_2_t test12_1_t:file { open };",
+ "neverallow on line 156 of policies/test-neverallow/policy.conf.std (or line 156 of policies/test-neverallow/policy.conf.std) violated by allow test13_1_t test13_1_t:file { read };",
+ "neverallowxperm on line 174 of policies/test-neverallow/policy.conf.std (or line 174 of policies/test-neverallow/policy.conf.std) violated by\nallow test15_t test15_t:file { ioctl };",
+ "neverallowxperm on line 182 of policies/test-neverallow/policy.conf.std (or line 182 of policies/test-neverallow/policy.conf.std) violated by\nallowxperm test16_t test16_t:file ioctl { 0x1111 };",
+ "neverallowxperm on line 198 of policies/test-neverallow/policy.conf.std (or line 198 of policies/test-neverallow/policy.conf.std) violated by\nallowxperm test18_t test18_t:file ioctl { 0x1111 };",
+ "neverallowxperm on line 206 of policies/test-neverallow/policy.conf.std (or line 206 of policies/test-neverallow/policy.conf.std) violated by\nallowxperm test19_t test19_t:file ioctl { 0x1111 };",
+ "neverallowxperm on line 216 of policies/test-neverallow/policy.conf.std (or line 216 of policies/test-neverallow/policy.conf.std) violated by\nallowxperm test20_a test20_a:file ioctl { 0x1111 };",
+ "neverallowxperm on line 227 of policies/test-neverallow/policy.conf.std (or line 227 of policies/test-neverallow/policy.conf.std) violated by\nallowxperm test21_1_a test21_2_a:file ioctl { 0x1111 };",
+ "neverallowxperm on line 237 of policies/test-neverallow/policy.conf.std (or line 237 of policies/test-neverallow/policy.conf.std) violated by\nallowxperm test22_t test22_t:file ioctl { 0x1111 };",
+ "neverallowxperm on line 247 of policies/test-neverallow/policy.conf.std (or line 247 of policies/test-neverallow/policy.conf.std) violated by\nallowxperm test23_t test23_t:file ioctl { 0x1111 };",
+ "neverallowxperm on line 257 of policies/test-neverallow/policy.conf.std (or line 257 of policies/test-neverallow/policy.conf.std) violated by\nallowxperm test24_t test24_a:file ioctl { 0x1111 };",
+ "neverallowxperm on line 267 of policies/test-neverallow/policy.conf.std (or line 267 of policies/test-neverallow/policy.conf.std) violated by\nallowxperm test25_t test25_t:file ioctl { 0x1111 };",
+ "neverallowxperm on line 277 of policies/test-neverallow/policy.conf.std (or line 277 of policies/test-neverallow/policy.conf.std) violated by\nallowxperm test26_a test26_a:file ioctl { 0x1111 };",
+ "neverallowxperm on line 277 of policies/test-neverallow/policy.conf.std (or line 277 of policies/test-neverallow/policy.conf.std) violated by\nallowxperm test26_a test26_a:file ioctl { 0x1111 };",
+ };
+
+ if (policydb_init(&base_expanded))
+ CU_FAIL_FATAL("Failed to initialize policy");
+
+ if (test_load_policy(&basemod, POLICY_BASE, mls, "test-neverallow", "policy.conf"))
+ CU_FAIL_FATAL("Failed to load policy");
+
+ if (link_modules(NULL, &basemod, NULL, 0, 0))
+ CU_FAIL_FATAL("Failed to link base module");
+
+ if (expand_module(NULL, &basemod, &base_expanded, 0, 0))
+ CU_FAIL_FATAL("Failed to expand policy");
+
+ if ((handle = sepol_handle_create()) == NULL)
+ CU_FAIL_FATAL("Failed to initialize handle");
+
+ sepol_msg_set_callback(handle, msg_handler, NULL);
+
+ if (check_assertions(handle, &base_expanded, base_expanded.global->branch_list->avrules) != -1)
+ CU_FAIL("Assertions did not trigger");
+
+ messages_check(ARRAY_SIZE(expected_messages), expected_messages);
+
+ sepol_handle_destroy(handle);
+ messages_clean();
+ policydb_destroy(&basemod);
+ policydb_destroy(&base_expanded);
+}
+
+int neverallow_add_tests(CU_pSuite suite)
+{
+ /*
+ * neverallow rules operate only on types and are unaffected by MLS
+ * (avoid adjusting the messages for std and mls)
+ */
+ if (mls)
+ return 0;
+
+ if (NULL == CU_add_test(suite, "neverallow_basic", test_neverallow_basic)) {
+ CU_cleanup_registry();
+ return CU_get_error();
+ }
+
+ return 0;
+}
diff --git a/libsepol/tests/test-neverallow.h b/libsepol/tests/test-neverallow.h
new file mode 100644
index 00000000..d3c2a74e
--- /dev/null
+++ b/libsepol/tests/test-neverallow.h
@@ -0,0 +1,10 @@
+#ifndef TEST_NEVERALLOW_H__
+#define TEST_NEVERALLOW_H__
+
+#include <CUnit/Basic.h>
+
+int neverallow_test_init(void);
+int neverallow_test_cleanup(void);
+int neverallow_add_tests(CU_pSuite suite);
+
+#endif /* TEST_NEVERALLOW_H__ */
--
2.38.1
