From patchwork Wed Sep 15 16:31:40 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 12496739 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CA5ECC4332F for ; Wed, 15 Sep 2021 16:34:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B660A610D1 for ; Wed, 15 Sep 2021 16:34:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229956AbhIOQgQ (ORCPT ); Wed, 15 Sep 2021 12:36:16 -0400 Received: from frasgout.his.huawei.com ([185.176.79.56]:3827 "EHLO frasgout.his.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229894AbhIOQeK (ORCPT ); Wed, 15 Sep 2021 12:34:10 -0400 Received: from fraeml714-chm.china.huawei.com (unknown [172.18.147.226]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4H8m0c3vhRz67yV7; Thu, 16 Sep 2021 00:30:24 +0800 (CST) Received: from roberto-ThinkStation-P620.huawei.com (10.204.63.22) by fraeml714-chm.china.huawei.com (10.206.15.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.8; Wed, 15 Sep 2021 18:32:48 +0200 From: Roberto Sassu To: , , CC: , , , , , Roberto Sassu Subject: [RFC][PATCH 4/9] diglim: Tests - LSM Date: Wed, 15 Sep 2021 18:31:40 +0200 Message-ID: <20210915163145.1046505-5-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210915163145.1046505-1-roberto.sassu@huawei.com> References: <20210915163145.1046505-1-roberto.sassu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.204.63.22] X-ClientProxiedBy: lhreml753-chm.china.huawei.com (10.201.108.203) To fraeml714-chm.china.huawei.com (10.206.15.33) X-CFilter-Loop: Reflected Precedence: bulk List-ID: Introduce more tests to ensure that DIGLIM LSM works as expected: - digest_list_add_del_test_parser_upload; - digest_list_add_del_test_parser_upload_not_measured; - digest_list_add_del_test_parser_upload_write; - digest_list_add_del_test_parser_upload_read; - digest_list_add_del_test_parser_upload_char_dev. The tests are in tools/testing/selftests/diglim/selftest.c. A description of the tests can be found in Documentation/security/diglim/tests.rst. Signed-off-by: Roberto Sassu --- Documentation/security/diglim/tests.rst | 18 +- tools/testing/selftests/diglim/Makefile | 12 +- tools/testing/selftests/diglim/common.h | 9 + tools/testing/selftests/diglim/selftest.c | 357 +++++++++++++++++++++- 4 files changed, 378 insertions(+), 18 deletions(-) diff --git a/Documentation/security/diglim/tests.rst b/Documentation/security/diglim/tests.rst index 899e7d6683cf..21874918433d 100644 --- a/Documentation/security/diglim/tests.rst +++ b/Documentation/security/diglim/tests.rst @@ -14,7 +14,12 @@ expected: - ``digest_list_add_del_test_file_upload_measured``; - ``digest_list_add_del_test_file_upload_measured_chown``; - ``digest_list_check_measurement_list_test_file_upload``; -- ``digest_list_check_measurement_list_test_buffer_upload``. +- ``digest_list_check_measurement_list_test_buffer_upload``; +- ``digest_list_add_del_test_parser_upload``; +- ``digest_list_add_del_test_parser_upload_not_measured`` +- ``digest_list_add_del_test_parser_upload_write``; +- ``digest_list_add_del_test_parser_upload_read``; +- ``digest_list_add_del_test_parser_upload_char_dev``. The tests are in ``tools/testing/selftests/diglim/selftest.c``. @@ -68,3 +73,14 @@ addition. The ``file_upload`` variant uploads a file, while the ``buffer_upload`` variant uploads a buffer. + +The ``digest_list_add_del_test_parser`` tests verify the correctness of +DIGLIM LSM. The ``upload`` variant ensures that files opened by the parser +are evaluated and the actions are copied to the converted digest list. The +``upload_not_measured`` variant ensures that the IMA measure action is not +set to the converted digest list if the parser read a file not measured. +The ``upload_write`` variant ensures that the parser cannot access a file +concurrently written by another process. The ``upload_read`` variant +ensures that files being read by the parser cannot be written by other +processes. Finally, the ``upload_char_dev`` variant ensures that the parser +cannot access files without measurable content (e.g. character device). diff --git a/tools/testing/selftests/diglim/Makefile b/tools/testing/selftests/diglim/Makefile index 100c219955d7..0e68d8363dd3 100644 --- a/tools/testing/selftests/diglim/Makefile +++ b/tools/testing/selftests/diglim/Makefile @@ -7,13 +7,19 @@ LDLIBS += -lpthread OVERRIDE_TARGETS = 1 -TEST_GEN_PROGS = selftest -TEST_GEN_PROGS_EXTENDED = libcommon.so +TEST_GEN_PROGS = selftest manage_digest_lists +TEST_GEN_PROGS_EXTENDED = libcommon.so libcommon.a common.o include ../lib.mk $(OUTPUT)/libcommon.so: common.c $(CC) $(CFLAGS) -shared -fPIC $< $(LDLIBS) -o $@ +$(OUTPUT)/libcommon.a: common.o + ar rcs libcommon.a common.o + $(OUTPUT)/selftest: selftest.c $(TEST_GEN_PROGS_EXTENDED) - $(CC) $(CFLAGS) $< -o $@ $(LDFLAGS) -lcommon + $(CC) $(CFLAGS) -DOUTPUT=\"$(OUTPUT)\" $< -o $@ $(LDFLAGS) -lcommon + +$(OUTPUT)/manage_digest_lists: manage_digest_lists.c $(TEST_GEN_PROGS_EXTENDED) + $(CC) $(CFLAGS) -static $< -o $@ $(LDFLAGS) -lcommon diff --git a/tools/testing/selftests/diglim/common.h b/tools/testing/selftests/diglim/common.h index 6c7979f4182e..b71031adb830 100644 --- a/tools/testing/selftests/diglim/common.h +++ b/tools/testing/selftests/diglim/common.h @@ -26,6 +26,15 @@ #define BUFFER_SIZE 1024 +#define INTEGRITY_DIR "/sys/kernel/security/integrity" +#define DIGEST_LIST_DIR INTEGRITY_DIR "/diglim" +#define DIGEST_QUERY_PATH DIGEST_LIST_DIR "/digest_query" +#define DIGEST_LABEL_PATH DIGEST_LIST_DIR "/digest_list_label" +#define DIGEST_LIST_ADD_PATH DIGEST_LIST_DIR "/digest_list_add" +#define DIGEST_LIST_DEL_PATH DIGEST_LIST_DIR "/digest_list_del" +#define DIGEST_LISTS_LOADED_PATH DIGEST_LIST_DIR "/digest_lists_loaded" +#define DIGESTS_COUNT DIGEST_LIST_DIR "/digests_count" + int write_buffer(char *path, char *buffer, size_t buffer_len, int uid); int read_buffer(char *path, char **buffer, size_t *buffer_len, bool alloc, bool is_char); diff --git a/tools/testing/selftests/diglim/selftest.c b/tools/testing/selftests/diglim/selftest.c index 273ba80c43fd..af7a590c445f 100644 --- a/tools/testing/selftests/diglim/selftest.c +++ b/tools/testing/selftests/diglim/selftest.c @@ -63,16 +63,6 @@ typedef uint64_t u64; #define DIGEST_LIST_PATH_TEMPLATE "/tmp/digest_list.XXXXXX" -#define INTEGRITY_DIR "/sys/kernel/security/integrity" - -#define DIGEST_LIST_DIR INTEGRITY_DIR "/diglim" -#define DIGEST_QUERY_PATH DIGEST_LIST_DIR "/digest_query" -#define DIGEST_LABEL_PATH DIGEST_LIST_DIR "/digest_list_label" -#define DIGEST_LIST_ADD_PATH DIGEST_LIST_DIR "/digest_list_add" -#define DIGEST_LIST_DEL_PATH DIGEST_LIST_DIR "/digest_list_del" -#define DIGEST_LISTS_LOADED_PATH DIGEST_LIST_DIR "/digest_lists_loaded" -#define DIGESTS_COUNT DIGEST_LIST_DIR "/digests_count" - #define IMA_POLICY_PATH INTEGRITY_DIR "/ima/policy" #define IMA_MEASUREMENTS_PATH INTEGRITY_DIR "/ima/ascii_runtime_measurements" @@ -94,7 +84,11 @@ typedef uint64_t u64; #define MAX_DIGEST_LIST_SIZE 10000 #define NUM_ITERATIONS 100000 -enum upload_types { UPLOAD_FILE, UPLOAD_FILE_CHOWN, UPLOAD_BUFFER }; +#define DIGEST_LIST_PARSER_PATH OUTPUT "/manage_digest_lists" +#define DIGEST_LIST_PARSER_PATH_COPY "/tmp/diglim/manage_digest_lists" + +enum upload_types { UPLOAD_FILE, UPLOAD_FILE_CHOWN, UPLOAD_BUFFER, + UPLOAD_PARSER, UPLOAD_PARSER_CHOWN, NO_UPLOAD }; const char *const hash_algo_name[HASH_ALGO__LAST] = { [HASH_ALGO_MD4] = "md4", @@ -486,6 +480,69 @@ static struct digest_list_item *digest_list_generate_random(void) return !ret ? digest_list : NULL; } +static struct digest_list_item *digest_list_generate_file(char *file_path, + enum compact_types type) +{ + struct digest_list_item *digest_list; + struct compact_list_hdr *hdr; + u8 digest[64]; + int ret; + + digest_list = calloc(1, sizeof(*digest_list)); + if (!digest_list) + return NULL; + + digest_list->size = sizeof(struct compact_list_hdr) + + hash_digest_size[HASH_ALGO_SHA256]; + digest_list->buf = calloc(digest_list->size, sizeof(unsigned char)); + if (!digest_list->buf) { + ret = -ENOMEM; + goto out; + } + + hdr = (struct compact_list_hdr *)digest_list->buf; + + hdr->version = 1; + hdr->_reserved = 0; + hdr->type = type; + hdr->modifiers = 0; + hdr->algo = HASH_ALGO_SHA256; + hdr->count = 1; + hdr->datalen = hash_digest_size[hdr->algo]; + + hdr->type = __cpu_to_le16(hdr->type); + hdr->algo = __cpu_to_le16(hdr->algo); + hdr->count = __cpu_to_le32(hdr->count); + hdr->datalen = __cpu_to_le32(hdr->datalen); + + ret = calc_file_digest(digest_list->buf + sizeof(*hdr), file_path, + HASH_ALGO_SHA256); + if (ret < 0) + goto out; + + digest_list->algo = get_ima_hash_algo(); + if (digest_list->algo == HASH_ALGO__LAST) { + ret = -ENOENT; + goto out; + } + + ret = calc_digest(digest, digest_list->buf, digest_list->size, + digest_list->algo); + if (ret < 0) + goto out; + + _bin2hex(digest_list->digest_str, digest, + hash_digest_size[digest_list->algo]); +out: + if (ret < 0) { + free(digest_list->buf); + free(digest_list); + return NULL; + } + + return digest_list; +} + static int digest_list_upload(struct digest_list_item *digest_list, enum ops op, enum upload_types upload_type, int uid) { @@ -494,16 +551,20 @@ static int digest_list_upload(struct digest_list_item *digest_list, enum ops op, unsigned char *buffer = digest_list->buf; size_t buffer_len = digest_list->size; unsigned char rnd[3]; - int ret = 0, fd; + int ret = 0, fd, status; if (op == DIGEST_LIST_ADD) { if (upload_type == UPLOAD_FILE || - upload_type == UPLOAD_FILE_CHOWN) { + upload_type == UPLOAD_FILE_CHOWN || + upload_type == UPLOAD_PARSER || + upload_type == UPLOAD_PARSER_CHOWN || + upload_type == NO_UPLOAD) { fd = mkstemp(path_template); if (fd < 0) return -EPERM; - if (upload_type == UPLOAD_FILE_CHOWN) + if (upload_type == UPLOAD_FILE_CHOWN || + upload_type == UPLOAD_PARSER_CHOWN) ret = fchown(fd, 3000, -1); fchmod(fd, 0644); @@ -550,6 +611,25 @@ static int digest_list_upload(struct digest_list_item *digest_list, enum ops op, strlen(basename), -1); if (ret < 0) goto out; + } else if (upload_type == UPLOAD_PARSER || + upload_type == UPLOAD_PARSER_CHOWN) { + if (fork() == 0) { + execlp(DIGEST_LIST_PARSER_PATH_COPY, + DIGEST_LIST_PARSER_PATH_COPY, + path_template, path_upload, NULL); + exit(1); + } + + ret = 0; + + wait(&status); + if (WEXITSTATUS(status) != 0) + ret = -EINVAL; + + goto out; + } else if (upload_type == NO_UPLOAD) { + ret = 0; + goto out; } ret = write_buffer(path_upload, (char *)buffer, buffer_len, uid); @@ -1439,4 +1519,253 @@ TEST_F_TIMEOUT(test_measure, UPLOAD_BUFFER); } +FIXTURE(test_parser) +{ + struct digest_list_item *digest_list; +}; + +#define PARSER_RULES "measure func=DIGEST_LIST_CHECK fowner=3000 \n" + +FIXTURE_SETUP(test_parser) +{ + int ret; + + ret = load_ima_policy(PARSER_RULES); + ASSERT_EQ(0, ret) { + TH_LOG("load_ima_policy() failed"); + } + + unlink(DIGEST_LIST_PARSER_PATH_COPY); + mkdir("/tmp/diglim", 0700); + + ret = copy_file(DIGEST_LIST_PARSER_PATH, DIGEST_LIST_PARSER_PATH_COPY); + ASSERT_EQ(0, ret) { + TH_LOG("copy_file() failed"); + } + + ret = chown(DIGEST_LIST_PARSER_PATH_COPY, 3000, -1); + ASSERT_EQ(0, ret) { + TH_LOG("chown() failed"); + } + + chmod(DIGEST_LIST_PARSER_PATH_COPY, 0755); + + self->digest_list = digest_list_generate_file( + DIGEST_LIST_PARSER_PATH_COPY, + COMPACT_PARSER); + ASSERT_NE(NULL, self->digest_list) { + TH_LOG("Cannot generate digest list"); + } + + self->digest_list->actions |= (1 << COMPACT_ACTION_IMA_MEASURED); + + ret = digest_list_upload(self->digest_list, DIGEST_LIST_ADD, + UPLOAD_FILE, 1000); + ASSERT_EQ(0, ret) { + TH_LOG("digest_list_upload() failed"); + } + + ret = digest_list_check(self->digest_list, DIGEST_LIST_ADD); + ASSERT_EQ(0, ret) { + TH_LOG("digest_list_check() failed"); + } +} + +FIXTURE_TEARDOWN(test_parser) +{ + int ret; + + ret = digest_list_upload(self->digest_list, DIGEST_LIST_DEL, + UPLOAD_FILE, 1000); + ASSERT_EQ(0, ret) { + TH_LOG("digest_list_upload() failed"); + } + + free(self->digest_list->buf); + free(self->digest_list); +} + +TEST_F_TIMEOUT(test_parser, digest_list_add_del_test_parser_upload, UINT_MAX) +{ + struct digest_list_item *digest_list; + int ret; + + digest_list = digest_list_generate_file("/bin/cat", COMPACT_FILE); + ASSERT_NE(NULL, digest_list) { + TH_LOG("Cannot generate digest list"); + } + + digest_list->actions |= (1 << COMPACT_ACTION_IMA_MEASURED); + + ret = digest_list_upload(digest_list, DIGEST_LIST_ADD, + UPLOAD_PARSER_CHOWN, -1); + ASSERT_EQ(0, ret) { + TH_LOG("digest_list_upload() failed"); + } + + ret = digest_list_check(digest_list, DIGEST_LIST_ADD); + ASSERT_EQ(0, ret) { + TH_LOG("digest_list_check() failed"); + } + + ret = digest_list_upload(digest_list, DIGEST_LIST_DEL, + UPLOAD_PARSER_CHOWN, -1); + ASSERT_EQ(0, ret) { + TH_LOG("digest_list_upload() failed"); + } + + ret = digest_list_check(digest_list, DIGEST_LIST_DEL); + ASSERT_EQ(0, ret) { + TH_LOG("digest_list_check() failed"); + } + + free(digest_list); +} + +TEST_F_TIMEOUT(test_parser, digest_list_add_del_test_parser_upload_not_measured, + UINT_MAX) +{ + struct digest_list_item *digest_list; + int ret; + + digest_list = digest_list_generate_file("/bin/cat", COMPACT_FILE); + ASSERT_NE(NULL, digest_list) { + TH_LOG("Cannot generate digest list"); + } + + ret = digest_list_upload(digest_list, DIGEST_LIST_ADD, + UPLOAD_PARSER, -1); + ASSERT_EQ(0, ret) { + TH_LOG("digest_list_upload() failed"); + } + + ret = digest_list_check(digest_list, DIGEST_LIST_ADD); + ASSERT_EQ(0, ret) { + TH_LOG("digest_list_check() failed"); + } + + ret = digest_list_upload(digest_list, DIGEST_LIST_DEL, + UPLOAD_PARSER, -1); + ASSERT_EQ(0, ret) { + TH_LOG("digest_list_upload() failed"); + } + + ret = digest_list_check(digest_list, DIGEST_LIST_DEL); + ASSERT_EQ(0, ret) { + TH_LOG("digest_list_check() failed"); + } + + free(digest_list); +} + +TEST_F_TIMEOUT(test_parser, digest_list_add_del_test_parser_upload_write, + UINT_MAX) +{ + char path_template[] = DIGEST_LIST_PATH_TEMPLATE; + struct digest_list_item *digest_list; + int ret, fd, status, fds[2]; + char c = 0; + + digest_list = digest_list_generate_file("/bin/cat", COMPACT_FILE); + ASSERT_NE(NULL, digest_list) { + TH_LOG("Cannot generate digest list"); + } + + digest_list->actions |= (1 << COMPACT_ACTION_IMA_MEASURED); + + ret = digest_list_upload(digest_list, DIGEST_LIST_ADD, NO_UPLOAD, -1); + ASSERT_EQ(0, ret) { + TH_LOG("digest_list_upload() failed"); + } + + memcpy(path_template + sizeof(DIGEST_LIST_PATH_TEMPLATE) - 7, + digest_list->filename_suffix, 6); + + ret = pipe(fds); + ASSERT_EQ(0, ret) { + TH_LOG("pipe() failed"); + } + + if (fork() == 0) { + fd = open(path_template, O_WRONLY); + if (fd < 0) + exit(1); + + close(fds[1]); + ret = read(fds[0], &c, sizeof(c)); + exit(1); + } + + close(fds[0]); + + if (fork() == 0) { + execlp(DIGEST_LIST_PARSER_PATH, DIGEST_LIST_PARSER_PATH, + path_template, DIGEST_LIST_ADD_PATH, NULL); + exit(1); + } + + wait(&status); + ASSERT_EQ(1, WEXITSTATUS(status)) { + TH_LOG("digest list parser unexpected exit code %d", + WEXITSTATUS(status)); + } + + free(digest_list); +} + +TEST_F_TIMEOUT(test_parser, digest_list_add_del_test_parser_upload_read, + UINT_MAX) +{ + char path_template[] = DIGEST_LIST_PATH_TEMPLATE; + struct digest_list_item *digest_list; + int ret, fd; + + digest_list = digest_list_generate_file("/bin/cat", COMPACT_FILE); + ASSERT_NE(NULL, digest_list) { + TH_LOG("Cannot generate digest list"); + } + + ret = digest_list_upload(digest_list, DIGEST_LIST_ADD, NO_UPLOAD, -1); + ASSERT_EQ(0, ret) { + TH_LOG("digest_list_upload() failed"); + } + + memcpy(path_template + sizeof(DIGEST_LIST_PATH_TEMPLATE) - 7, + digest_list->filename_suffix, 6); + + if (fork() == 0) { + execlp(DIGEST_LIST_PARSER_PATH, DIGEST_LIST_PARSER_PATH, + path_template, DIGEST_LIST_ADD_PATH, "open_and_wait", + NULL); + exit(1); + } + + fd = open(path_template, O_WRONLY); + ASSERT_LT(0, fd) { + TH_LOG("digest list open success unexpected"); + close(fd); + } + + wait(NULL); + free(digest_list); + unlink(path_template); +} + +TEST_F_TIMEOUT(test_parser, digest_list_add_del_test_parser_upload_char_dev, + UINT_MAX) +{ + int status; + + if (fork() == 0) { + execlp(DIGEST_LIST_PARSER_PATH, DIGEST_LIST_PARSER_PATH, + "/dev/null", DIGEST_LIST_ADD_PATH, NULL); + exit(1); + } + + wait(&status); + ASSERT_NE(0, WEXITSTATUS(status)) { + TH_LOG("digest list parser success unexpected"); + } +} + TEST_HARNESS_MAIN