LSM: selftests for Linux Security Module syscalls
Add selftests for the three system calls supporting the LSM infrastructure. This set of tests is limited by the differences in access policy enforced by the existing security modules. Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> Reviewed-by: Mickaël Salaün <mic@digikod.net> Tested-by: Mickaël Salaün <mic@digikod.net> Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Casey Schaufler
Paul Moore
parent
762c934317
commit
d3d929a8b0
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@ -19513,6 +19513,7 @@ W: http://kernsec.org/
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T: git git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm.git
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F: include/uapi/linux/lsm.h
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F: security/
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F: tools/testing/selftests/lsm/
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X: security/selinux/
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SELINUX SECURITY MODULE
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@ -43,6 +43,7 @@ TARGETS += landlock
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TARGETS += lib
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TARGETS += livepatch
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TARGETS += lkdtm
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TARGETS += lsm
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TARGETS += membarrier
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TARGETS += memfd
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TARGETS += memory-hotplug
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@ -0,0 +1 @@
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/*_test
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@ -0,0 +1,17 @@
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# SPDX-License-Identifier: GPL-2.0
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#
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# First run: make -C ../../../.. headers_install
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CFLAGS += -Wall -O2 $(KHDR_INCLUDES)
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LOCAL_HDRS += common.h
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TEST_GEN_PROGS := lsm_get_self_attr_test lsm_list_modules_test \
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lsm_set_self_attr_test
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include ../lib.mk
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$(OUTPUT)/lsm_get_self_attr_test: lsm_get_self_attr_test.c common.c
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$(OUTPUT)/lsm_set_self_attr_test: lsm_set_self_attr_test.c common.c
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$(OUTPUT)/lsm_list_modules_test: lsm_list_modules_test.c common.c
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EXTRA_CLEAN = $(OUTPUT)/common.o
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@ -0,0 +1,89 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Linux Security Module infrastructure tests
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*
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* Copyright © 2023 Casey Schaufler <casey@schaufler-ca.com>
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*/
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#define _GNU_SOURCE
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#include <linux/lsm.h>
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#include <fcntl.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include "common.h"
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#define PROCATTR "/proc/self/attr/"
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int read_proc_attr(const char *attr, char *value, size_t size)
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{
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int fd;
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int len;
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char *path;
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len = strlen(PROCATTR) + strlen(attr) + 1;
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path = calloc(len, 1);
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if (path == NULL)
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return -1;
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sprintf(path, "%s%s", PROCATTR, attr);
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fd = open(path, O_RDONLY);
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free(path);
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if (fd < 0)
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return -1;
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len = read(fd, value, size);
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close(fd);
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/* Ensure value is terminated */
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if (len <= 0 || len == size)
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return -1;
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value[len] = '\0';
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path = strchr(value, '\n');
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if (path)
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*path = '\0';
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return 0;
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}
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int read_sysfs_lsms(char *lsms, size_t size)
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{
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FILE *fp;
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size_t red;
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fp = fopen("/sys/kernel/security/lsm", "r");
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if (fp == NULL)
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return -1;
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red = fread(lsms, 1, size, fp);
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fclose(fp);
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if (red <= 0 || red == size)
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return -1;
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lsms[red] = '\0';
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return 0;
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}
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int attr_lsm_count(void)
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{
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char *names = calloc(sysconf(_SC_PAGESIZE), 1);
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int count = 0;
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if (!names)
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return 0;
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if (read_sysfs_lsms(names, sysconf(_SC_PAGESIZE)))
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return 0;
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if (strstr(names, "selinux"))
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count++;
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if (strstr(names, "smack"))
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count++;
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if (strstr(names, "apparmor"))
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count++;
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return count;
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}
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@ -0,0 +1,33 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Linux Security Module infrastructure tests
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*
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* Copyright © 2023 Casey Schaufler <casey@schaufler-ca.com>
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*/
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#ifndef lsm_get_self_attr
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static inline int lsm_get_self_attr(unsigned int attr, struct lsm_ctx *ctx,
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size_t *size, __u32 flags)
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{
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return syscall(__NR_lsm_get_self_attr, attr, ctx, size, flags);
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}
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#endif
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#ifndef lsm_set_self_attr
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static inline int lsm_set_self_attr(unsigned int attr, struct lsm_ctx *ctx,
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size_t size, __u32 flags)
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{
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return syscall(__NR_lsm_set_self_attr, attr, ctx, size, flags);
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}
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#endif
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#ifndef lsm_list_modules
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static inline int lsm_list_modules(__u64 *ids, size_t *size, __u32 flags)
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{
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return syscall(__NR_lsm_list_modules, ids, size, flags);
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}
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#endif
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extern int read_proc_attr(const char *attr, char *value, size_t size);
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extern int read_sysfs_lsms(char *lsms, size_t size);
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int attr_lsm_count(void);
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@ -0,0 +1,3 @@
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CONFIG_SYSFS=y
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CONFIG_SECURITY=y
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CONFIG_SECURITYFS=y
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@ -0,0 +1,275 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Linux Security Module infrastructure tests
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* Tests for the lsm_get_self_attr system call
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*
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* Copyright © 2022 Casey Schaufler <casey@schaufler-ca.com>
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*/
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#define _GNU_SOURCE
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#include <linux/lsm.h>
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#include <fcntl.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include "../kselftest_harness.h"
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#include "common.h"
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static struct lsm_ctx *next_ctx(struct lsm_ctx *ctxp)
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{
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void *vp;
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vp = (void *)ctxp + sizeof(*ctxp) + ctxp->ctx_len;
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return (struct lsm_ctx *)vp;
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}
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TEST(size_null_lsm_get_self_attr)
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{
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const long page_size = sysconf(_SC_PAGESIZE);
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struct lsm_ctx *ctx = calloc(page_size, 1);
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ASSERT_NE(NULL, ctx);
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errno = 0;
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ASSERT_EQ(-1, lsm_get_self_attr(LSM_ATTR_CURRENT, ctx, NULL, 0));
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ASSERT_EQ(EINVAL, errno);
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free(ctx);
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}
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TEST(ctx_null_lsm_get_self_attr)
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{
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const long page_size = sysconf(_SC_PAGESIZE);
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size_t size = page_size;
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int rc;
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rc = lsm_get_self_attr(LSM_ATTR_CURRENT, NULL, &size, 0);
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if (attr_lsm_count()) {
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ASSERT_NE(-1, rc);
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ASSERT_NE(1, size);
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} else {
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ASSERT_EQ(-1, rc);
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}
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}
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TEST(size_too_small_lsm_get_self_attr)
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{
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const long page_size = sysconf(_SC_PAGESIZE);
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struct lsm_ctx *ctx = calloc(page_size, 1);
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size_t size = 1;
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ASSERT_NE(NULL, ctx);
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errno = 0;
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ASSERT_EQ(-1, lsm_get_self_attr(LSM_ATTR_CURRENT, ctx, &size, 0));
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if (attr_lsm_count()) {
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ASSERT_EQ(E2BIG, errno);
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} else {
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ASSERT_EQ(EOPNOTSUPP, errno);
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}
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ASSERT_NE(1, size);
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free(ctx);
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}
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TEST(flags_zero_lsm_get_self_attr)
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{
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const long page_size = sysconf(_SC_PAGESIZE);
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struct lsm_ctx *ctx = calloc(page_size, 1);
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__u64 *syscall_lsms = calloc(page_size, 1);
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size_t size;
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int lsmcount;
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int i;
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ASSERT_NE(NULL, ctx);
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errno = 0;
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size = page_size;
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ASSERT_EQ(-1, lsm_get_self_attr(LSM_ATTR_CURRENT, ctx, &size,
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LSM_FLAG_SINGLE));
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ASSERT_EQ(EINVAL, errno);
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ASSERT_EQ(page_size, size);
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lsmcount = syscall(__NR_lsm_list_modules, syscall_lsms, &size, 0);
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ASSERT_LE(1, lsmcount);
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ASSERT_NE(NULL, syscall_lsms);
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for (i = 0; i < lsmcount; i++) {
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errno = 0;
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size = page_size;
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ctx->id = syscall_lsms[i];
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if (syscall_lsms[i] == LSM_ID_SELINUX ||
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syscall_lsms[i] == LSM_ID_SMACK ||
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syscall_lsms[i] == LSM_ID_APPARMOR) {
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ASSERT_EQ(1, lsm_get_self_attr(LSM_ATTR_CURRENT, ctx,
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&size, LSM_FLAG_SINGLE));
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} else {
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ASSERT_EQ(-1, lsm_get_self_attr(LSM_ATTR_CURRENT, ctx,
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&size,
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LSM_FLAG_SINGLE));
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}
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}
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free(ctx);
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}
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TEST(flags_overset_lsm_get_self_attr)
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{
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const long page_size = sysconf(_SC_PAGESIZE);
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struct lsm_ctx *ctx = calloc(page_size, 1);
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size_t size;
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ASSERT_NE(NULL, ctx);
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errno = 0;
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size = page_size;
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ASSERT_EQ(-1, lsm_get_self_attr(LSM_ATTR_CURRENT | LSM_ATTR_PREV, ctx,
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&size, 0));
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ASSERT_EQ(EOPNOTSUPP, errno);
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errno = 0;
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size = page_size;
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ASSERT_EQ(-1, lsm_get_self_attr(LSM_ATTR_CURRENT, ctx, &size,
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LSM_FLAG_SINGLE |
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(LSM_FLAG_SINGLE << 1)));
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ASSERT_EQ(EINVAL, errno);
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free(ctx);
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}
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TEST(basic_lsm_get_self_attr)
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{
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const long page_size = sysconf(_SC_PAGESIZE);
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size_t size = page_size;
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struct lsm_ctx *ctx = calloc(page_size, 1);
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struct lsm_ctx *tctx = NULL;
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__u64 *syscall_lsms = calloc(page_size, 1);
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char *attr = calloc(page_size, 1);
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int cnt_current = 0;
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int cnt_exec = 0;
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int cnt_fscreate = 0;
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int cnt_keycreate = 0;
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int cnt_prev = 0;
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int cnt_sockcreate = 0;
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int lsmcount;
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int count;
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int i;
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ASSERT_NE(NULL, ctx);
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ASSERT_NE(NULL, syscall_lsms);
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lsmcount = syscall(__NR_lsm_list_modules, syscall_lsms, &size, 0);
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ASSERT_LE(1, lsmcount);
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for (i = 0; i < lsmcount; i++) {
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switch (syscall_lsms[i]) {
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case LSM_ID_SELINUX:
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cnt_current++;
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cnt_exec++;
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cnt_fscreate++;
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cnt_keycreate++;
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cnt_prev++;
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cnt_sockcreate++;
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break;
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case LSM_ID_SMACK:
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cnt_current++;
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break;
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case LSM_ID_APPARMOR:
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cnt_current++;
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cnt_exec++;
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cnt_prev++;
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break;
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default:
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break;
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}
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}
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if (cnt_current) {
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size = page_size;
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count = lsm_get_self_attr(LSM_ATTR_CURRENT, ctx, &size, 0);
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ASSERT_EQ(cnt_current, count);
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tctx = ctx;
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ASSERT_EQ(0, read_proc_attr("current", attr, page_size));
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ASSERT_EQ(0, strcmp((char *)tctx->ctx, attr));
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for (i = 1; i < count; i++) {
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tctx = next_ctx(tctx);
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ASSERT_NE(0, strcmp((char *)tctx->ctx, attr));
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}
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}
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if (cnt_exec) {
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size = page_size;
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count = lsm_get_self_attr(LSM_ATTR_EXEC, ctx, &size, 0);
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ASSERT_GE(cnt_exec, count);
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if (count > 0) {
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tctx = ctx;
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if (read_proc_attr("exec", attr, page_size) == 0)
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ASSERT_EQ(0, strcmp((char *)tctx->ctx, attr));
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}
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for (i = 1; i < count; i++) {
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tctx = next_ctx(tctx);
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ASSERT_NE(0, strcmp((char *)tctx->ctx, attr));
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}
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}
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if (cnt_fscreate) {
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size = page_size;
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count = lsm_get_self_attr(LSM_ATTR_FSCREATE, ctx, &size, 0);
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ASSERT_GE(cnt_fscreate, count);
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if (count > 0) {
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tctx = ctx;
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if (read_proc_attr("fscreate", attr, page_size) == 0)
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ASSERT_EQ(0, strcmp((char *)tctx->ctx, attr));
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}
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for (i = 1; i < count; i++) {
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tctx = next_ctx(tctx);
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ASSERT_NE(0, strcmp((char *)tctx->ctx, attr));
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}
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}
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if (cnt_keycreate) {
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size = page_size;
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count = lsm_get_self_attr(LSM_ATTR_KEYCREATE, ctx, &size, 0);
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ASSERT_GE(cnt_keycreate, count);
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if (count > 0) {
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tctx = ctx;
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if (read_proc_attr("keycreate", attr, page_size) == 0)
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ASSERT_EQ(0, strcmp((char *)tctx->ctx, attr));
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}
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for (i = 1; i < count; i++) {
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tctx = next_ctx(tctx);
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ASSERT_NE(0, strcmp((char *)tctx->ctx, attr));
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}
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}
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if (cnt_prev) {
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size = page_size;
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count = lsm_get_self_attr(LSM_ATTR_PREV, ctx, &size, 0);
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ASSERT_GE(cnt_prev, count);
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if (count > 0) {
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tctx = ctx;
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ASSERT_EQ(0, read_proc_attr("prev", attr, page_size));
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ASSERT_EQ(0, strcmp((char *)tctx->ctx, attr));
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for (i = 1; i < count; i++) {
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tctx = next_ctx(tctx);
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ASSERT_NE(0, strcmp((char *)tctx->ctx, attr));
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}
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}
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}
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if (cnt_sockcreate) {
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size = page_size;
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count = lsm_get_self_attr(LSM_ATTR_SOCKCREATE, ctx, &size, 0);
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ASSERT_GE(cnt_sockcreate, count);
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if (count > 0) {
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tctx = ctx;
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if (read_proc_attr("sockcreate", attr, page_size) == 0)
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ASSERT_EQ(0, strcmp((char *)tctx->ctx, attr));
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}
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for (i = 1; i < count; i++) {
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tctx = next_ctx(tctx);
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ASSERT_NE(0, strcmp((char *)tctx->ctx, attr));
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}
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}
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free(ctx);
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free(attr);
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free(syscall_lsms);
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}
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TEST_HARNESS_MAIN
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@ -0,0 +1,140 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Linux Security Module infrastructure tests
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* Tests for the lsm_list_modules system call
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*
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* Copyright © 2022 Casey Schaufler <casey@schaufler-ca.com>
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*/
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#define _GNU_SOURCE
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#include <linux/lsm.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include "../kselftest_harness.h"
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#include "common.h"
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TEST(size_null_lsm_list_modules)
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{
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const long page_size = sysconf(_SC_PAGESIZE);
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__u64 *syscall_lsms = calloc(page_size, 1);
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ASSERT_NE(NULL, syscall_lsms);
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errno = 0;
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ASSERT_EQ(-1, lsm_list_modules(syscall_lsms, NULL, 0));
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ASSERT_EQ(EFAULT, errno);
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free(syscall_lsms);
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}
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TEST(ids_null_lsm_list_modules)
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{
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||||
const long page_size = sysconf(_SC_PAGESIZE);
|
||||
size_t size = page_size;
|
||||
|
||||
errno = 0;
|
||||
ASSERT_EQ(-1, lsm_list_modules(NULL, &size, 0));
|
||||
ASSERT_EQ(EFAULT, errno);
|
||||
ASSERT_NE(1, size);
|
||||
}
|
||||
|
||||
TEST(size_too_small_lsm_list_modules)
|
||||
{
|
||||
const long page_size = sysconf(_SC_PAGESIZE);
|
||||
__u64 *syscall_lsms = calloc(page_size, 1);
|
||||
size_t size = 1;
|
||||
|
||||
ASSERT_NE(NULL, syscall_lsms);
|
||||
errno = 0;
|
||||
ASSERT_EQ(-1, lsm_list_modules(syscall_lsms, &size, 0));
|
||||
ASSERT_EQ(E2BIG, errno);
|
||||
ASSERT_NE(1, size);
|
||||
|
||||
free(syscall_lsms);
|
||||
}
|
||||
|
||||
TEST(flags_set_lsm_list_modules)
|
||||
{
|
||||
const long page_size = sysconf(_SC_PAGESIZE);
|
||||
__u64 *syscall_lsms = calloc(page_size, 1);
|
||||
size_t size = page_size;
|
||||
|
||||
ASSERT_NE(NULL, syscall_lsms);
|
||||
errno = 0;
|
||||
ASSERT_EQ(-1, lsm_list_modules(syscall_lsms, &size, 7));
|
||||
ASSERT_EQ(EINVAL, errno);
|
||||
ASSERT_EQ(page_size, size);
|
||||
|
||||
free(syscall_lsms);
|
||||
}
|
||||
|
||||
TEST(correct_lsm_list_modules)
|
||||
{
|
||||
const long page_size = sysconf(_SC_PAGESIZE);
|
||||
size_t size = page_size;
|
||||
__u64 *syscall_lsms = calloc(page_size, 1);
|
||||
char *sysfs_lsms = calloc(page_size, 1);
|
||||
char *name;
|
||||
char *cp;
|
||||
int count;
|
||||
int i;
|
||||
|
||||
ASSERT_NE(NULL, sysfs_lsms);
|
||||
ASSERT_NE(NULL, syscall_lsms);
|
||||
ASSERT_EQ(0, read_sysfs_lsms(sysfs_lsms, page_size));
|
||||
|
||||
count = lsm_list_modules(syscall_lsms, &size, 0);
|
||||
ASSERT_LE(1, count);
|
||||
cp = sysfs_lsms;
|
||||
for (i = 0; i < count; i++) {
|
||||
switch (syscall_lsms[i]) {
|
||||
case LSM_ID_CAPABILITY:
|
||||
name = "capability";
|
||||
break;
|
||||
case LSM_ID_SELINUX:
|
||||
name = "selinux";
|
||||
break;
|
||||
case LSM_ID_SMACK:
|
||||
name = "smack";
|
||||
break;
|
||||
case LSM_ID_TOMOYO:
|
||||
name = "tomoyo";
|
||||
break;
|
||||
case LSM_ID_IMA:
|
||||
name = "ima";
|
||||
break;
|
||||
case LSM_ID_APPARMOR:
|
||||
name = "apparmor";
|
||||
break;
|
||||
case LSM_ID_YAMA:
|
||||
name = "yama";
|
||||
break;
|
||||
case LSM_ID_LOADPIN:
|
||||
name = "loadpin";
|
||||
break;
|
||||
case LSM_ID_SAFESETID:
|
||||
name = "safesetid";
|
||||
break;
|
||||
case LSM_ID_LOCKDOWN:
|
||||
name = "lockdown";
|
||||
break;
|
||||
case LSM_ID_BPF:
|
||||
name = "bpf";
|
||||
break;
|
||||
case LSM_ID_LANDLOCK:
|
||||
name = "landlock";
|
||||
break;
|
||||
default:
|
||||
name = "INVALID";
|
||||
break;
|
||||
}
|
||||
ASSERT_EQ(0, strncmp(cp, name, strlen(name)));
|
||||
cp += strlen(name) + 1;
|
||||
}
|
||||
|
||||
free(sysfs_lsms);
|
||||
free(syscall_lsms);
|
||||
}
|
||||
|
||||
TEST_HARNESS_MAIN
|
||||
|
|
@ -0,0 +1,74 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
/*
|
||||
* Linux Security Module infrastructure tests
|
||||
* Tests for the lsm_set_self_attr system call
|
||||
*
|
||||
* Copyright © 2022 Casey Schaufler <casey@schaufler-ca.com>
|
||||
*/
|
||||
|
||||
#define _GNU_SOURCE
|
||||
#include <linux/lsm.h>
|
||||
#include <string.h>
|
||||
#include <stdio.h>
|
||||
#include <unistd.h>
|
||||
#include <sys/types.h>
|
||||
#include "../kselftest_harness.h"
|
||||
#include "common.h"
|
||||
|
||||
TEST(ctx_null_lsm_set_self_attr)
|
||||
{
|
||||
ASSERT_EQ(-1, lsm_set_self_attr(LSM_ATTR_CURRENT, NULL,
|
||||
sizeof(struct lsm_ctx), 0));
|
||||
}
|
||||
|
||||
TEST(size_too_small_lsm_set_self_attr)
|
||||
{
|
||||
const long page_size = sysconf(_SC_PAGESIZE);
|
||||
struct lsm_ctx *ctx = calloc(page_size, 1);
|
||||
size_t size = page_size;
|
||||
|
||||
ASSERT_NE(NULL, ctx);
|
||||
if (attr_lsm_count()) {
|
||||
ASSERT_LE(1, lsm_get_self_attr(LSM_ATTR_CURRENT, ctx, &size,
|
||||
0));
|
||||
}
|
||||
ASSERT_EQ(-1, lsm_set_self_attr(LSM_ATTR_CURRENT, ctx, 1, 0));
|
||||
|
||||
free(ctx);
|
||||
}
|
||||
|
||||
TEST(flags_zero_lsm_set_self_attr)
|
||||
{
|
||||
const long page_size = sysconf(_SC_PAGESIZE);
|
||||
struct lsm_ctx *ctx = calloc(page_size, 1);
|
||||
size_t size = page_size;
|
||||
|
||||
ASSERT_NE(NULL, ctx);
|
||||
if (attr_lsm_count()) {
|
||||
ASSERT_LE(1, lsm_get_self_attr(LSM_ATTR_CURRENT, ctx, &size,
|
||||
0));
|
||||
}
|
||||
ASSERT_EQ(-1, lsm_set_self_attr(LSM_ATTR_CURRENT, ctx, size, 1));
|
||||
|
||||
free(ctx);
|
||||
}
|
||||
|
||||
TEST(flags_overset_lsm_set_self_attr)
|
||||
{
|
||||
const long page_size = sysconf(_SC_PAGESIZE);
|
||||
char *ctx = calloc(page_size, 1);
|
||||
size_t size = page_size;
|
||||
struct lsm_ctx *tctx = (struct lsm_ctx *)ctx;
|
||||
|
||||
ASSERT_NE(NULL, ctx);
|
||||
if (attr_lsm_count()) {
|
||||
ASSERT_LE(1, lsm_get_self_attr(LSM_ATTR_CURRENT, tctx, &size,
|
||||
0));
|
||||
}
|
||||
ASSERT_EQ(-1, lsm_set_self_attr(LSM_ATTR_CURRENT | LSM_ATTR_PREV, tctx,
|
||||
size, 0));
|
||||
|
||||
free(ctx);
|
||||
}
|
||||
|
||||
TEST_HARNESS_MAIN
|
||||
Loading…
Reference in New Issue