From patchwork Wed Mar 2 11:13:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 12765805 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D901FC433F5 for ; Wed, 2 Mar 2022 11:15:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241469AbiCBLQB (ORCPT ); Wed, 2 Mar 2022 06:16:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53290 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241323AbiCBLPw (ORCPT ); Wed, 2 Mar 2022 06:15:52 -0500 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 028DA606FB; Wed, 2 Mar 2022 03:14:34 -0800 (PST) Received: from fraeml714-chm.china.huawei.com (unknown [172.18.147.207]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4K7s1J3Kcnz67Kvs; Wed, 2 Mar 2022 19:13:24 +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 15.1.2308.21; Wed, 2 Mar 2022 12:14:31 +0100 From: Roberto Sassu To: , , , , , , , , CC: , , , , , , Roberto Sassu , Shuah Khan Subject: [PATCH v3 1/9] ima: Fix documentation-related warnings in ima_main.c Date: Wed, 2 Mar 2022 12:13:56 +0100 Message-ID: <20220302111404.193900-2-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220302111404.193900-1-roberto.sassu@huawei.com> References: <20220302111404.193900-1-roberto.sassu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.204.63.22] X-ClientProxiedBy: lhreml751-chm.china.huawei.com (10.201.108.201) To fraeml714-chm.china.huawei.com (10.206.15.33) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org Fix the following warnings in ima_main.c, displayed with W=n make argument: security/integrity/ima/ima_main.c:432: warning: Function parameter or member 'vma' not described in 'ima_file_mprotect' security/integrity/ima/ima_main.c:636: warning: Function parameter or member 'inode' not described in 'ima_post_create_tmpfile' security/integrity/ima/ima_main.c:636: warning: Excess function parameter 'file' description in 'ima_post_create_tmpfile' security/integrity/ima/ima_main.c:843: warning: Function parameter or member 'load_id' not described in 'ima_post_load_data' security/integrity/ima/ima_main.c:843: warning: Excess function parameter 'id' description in 'ima_post_load_data' Also, fix some style issues in the description of ima_post_create_tmpfile() and ima_post_path_mknod(). Reviewed-by: Shuah Khan Signed-off-by: Roberto Sassu Reviewed-by: Mimi Zohar --- security/integrity/ima/ima_main.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 8c6e4514d494..946ba8a12eab 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -418,6 +418,7 @@ int ima_file_mmap(struct file *file, unsigned long prot) /** * ima_file_mprotect - based on policy, limit mprotect change + * @vma: vm_area_struct protection is set to * @prot: contains the protection that will be applied by the kernel. * * Files can be mmap'ed read/write and later changed to execute to circumvent @@ -610,8 +611,8 @@ EXPORT_SYMBOL_GPL(ima_inode_hash); /** * ima_post_create_tmpfile - mark newly created tmpfile as new - * @mnt_userns: user namespace of the mount the inode was found from - * @file : newly created tmpfile + * @mnt_userns: user namespace of the mount the inode was found from + * @inode: inode of the newly created tmpfile * * No measuring, appraising or auditing of newly created tmpfiles is needed. * Skip calling process_measurement(), but indicate which newly, created @@ -643,7 +644,7 @@ void ima_post_create_tmpfile(struct user_namespace *mnt_userns, /** * ima_post_path_mknod - mark as a new inode - * @mnt_userns: user namespace of the mount the inode was found from + * @mnt_userns: user namespace of the mount the inode was found from * @dentry: newly created dentry * * Mark files created via the mknodat syscall as new, so that the @@ -814,8 +815,8 @@ int ima_load_data(enum kernel_load_data_id id, bool contents) * ima_post_load_data - appraise decision based on policy * @buf: pointer to in memory file contents * @size: size of in memory file contents - * @id: kernel load data caller identifier - * @description: @id-specific description of contents + * @load_id: kernel load data caller identifier + * @description: @load_id-specific description of contents * * Measure/appraise/audit in memory buffer based on policy. Policy rules * are written in terms of a policy identifier. From patchwork Wed Mar 2 11:13:57 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 12765803 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DD2A9C433EF for ; Wed, 2 Mar 2022 11:15:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241461AbiCBLQA (ORCPT ); Wed, 2 Mar 2022 06:16:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54934 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241344AbiCBLPw (ORCPT ); Wed, 2 Mar 2022 06:15:52 -0500 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C0F4060DAF; Wed, 2 Mar 2022 03:14:35 -0800 (PST) Received: from fraeml714-chm.china.huawei.com (unknown [172.18.147.226]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4K7s1K3cK2z67NJM; Wed, 2 Mar 2022 19:13:25 +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 15.1.2308.21; Wed, 2 Mar 2022 12:14:32 +0100 From: Roberto Sassu To: , , , , , , , , CC: , , , , , , Roberto Sassu Subject: [PATCH v3 2/9] ima: Always return a file measurement in ima_file_hash() Date: Wed, 2 Mar 2022 12:13:57 +0100 Message-ID: <20220302111404.193900-3-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220302111404.193900-1-roberto.sassu@huawei.com> References: <20220302111404.193900-1-roberto.sassu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.204.63.22] X-ClientProxiedBy: lhreml751-chm.china.huawei.com (10.201.108.201) To fraeml714-chm.china.huawei.com (10.206.15.33) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org __ima_inode_hash() checks if a digest has been already calculated by looking for the integrity_iint_cache structure associated to the passed inode. Users of ima_file_hash() (e.g. eBPF) might be interested in obtaining the information without having to setup an IMA policy so that the digest is always available at the time they call this function. In addition, they likely expect the digest to be fresh, e.g. recalculated by IMA after a file write. Although getting the digest from the bprm_committed_creds hook (as in the eBPF test) ensures that the digest is fresh, as the IMA hook is executed before that hook, this is not always the case (e.g. for the mmap_file hook). Call ima_collect_measurement() in __ima_inode_hash(), if the file descriptor is available (passed by ima_file_hash()) and the digest is not available/not fresh, and store the file measurement in a temporary integrity_iint_cache structure. This change does not cause memory usage increase, due to using the temporary integrity_iint_cache structure, and due to freeing the ima_digest_data structure inside integrity_iint_cache before exiting from __ima_inode_hash(). For compatibility reasons, the behavior of ima_inode_hash() remains unchanged. Signed-off-by: Roberto Sassu Reviewed-by: Mimi Zohar --- security/integrity/ima/ima_main.c | 46 ++++++++++++++++++++++--------- 1 file changed, 33 insertions(+), 13 deletions(-) diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 946ba8a12eab..ed1a82f1def3 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -520,20 +520,38 @@ int ima_file_check(struct file *file, int mask) } EXPORT_SYMBOL_GPL(ima_file_check); -static int __ima_inode_hash(struct inode *inode, char *buf, size_t buf_size) +static int __ima_inode_hash(struct inode *inode, struct file *file, char *buf, + size_t buf_size) { - struct integrity_iint_cache *iint; - int hash_algo; + struct integrity_iint_cache *iint = NULL, tmp_iint; + int rc, hash_algo; - if (!ima_policy_flag) - return -EOPNOTSUPP; + if (ima_policy_flag) { + iint = integrity_iint_find(inode); + if (iint) + mutex_lock(&iint->mutex); + } + + if ((!iint || !(iint->flags & IMA_COLLECTED)) && file) { + if (iint) + mutex_unlock(&iint->mutex); + + memset(&tmp_iint, 0, sizeof(tmp_iint)); + tmp_iint.inode = inode; + mutex_init(&tmp_iint.mutex); + + rc = ima_collect_measurement(&tmp_iint, file, NULL, 0, + ima_hash_algo, NULL); + if (rc < 0) + return -EOPNOTSUPP; + + iint = &tmp_iint; + mutex_lock(&iint->mutex); + } - iint = integrity_iint_find(inode); if (!iint) return -EOPNOTSUPP; - mutex_lock(&iint->mutex); - /* * ima_file_hash can be called when ima_collect_measurement has still * not been called, we might not always have a hash. @@ -552,12 +570,14 @@ static int __ima_inode_hash(struct inode *inode, char *buf, size_t buf_size) hash_algo = iint->ima_hash->algo; mutex_unlock(&iint->mutex); + if (iint == &tmp_iint) + kfree(iint->ima_hash); + return hash_algo; } /** - * ima_file_hash - return the stored measurement if a file has been hashed and - * is in the iint cache. + * ima_file_hash - return a measurement of the file * @file: pointer to the file * @buf: buffer in which to store the hash * @buf_size: length of the buffer @@ -570,7 +590,7 @@ static int __ima_inode_hash(struct inode *inode, char *buf, size_t buf_size) * The file hash returned is based on the entire file, including the appended * signature. * - * If IMA is disabled or if no measurement is available, return -EOPNOTSUPP. + * If the measurement cannot be performed, return -EOPNOTSUPP. * If the parameters are incorrect, return -EINVAL. */ int ima_file_hash(struct file *file, char *buf, size_t buf_size) @@ -578,7 +598,7 @@ int ima_file_hash(struct file *file, char *buf, size_t buf_size) if (!file) return -EINVAL; - return __ima_inode_hash(file_inode(file), buf, buf_size); + return __ima_inode_hash(file_inode(file), file, buf, buf_size); } EXPORT_SYMBOL_GPL(ima_file_hash); @@ -605,7 +625,7 @@ int ima_inode_hash(struct inode *inode, char *buf, size_t buf_size) if (!inode) return -EINVAL; - return __ima_inode_hash(inode, buf, buf_size); + return __ima_inode_hash(inode, NULL, buf, buf_size); } EXPORT_SYMBOL_GPL(ima_inode_hash); From patchwork Wed Mar 2 11:13:58 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 12765807 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 56165C433EF for ; Wed, 2 Mar 2022 11:15:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241424AbiCBLQH (ORCPT ); Wed, 2 Mar 2022 06:16:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51592 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241382AbiCBLPz (ORCPT ); Wed, 2 Mar 2022 06:15:55 -0500 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B201BA27AF; Wed, 2 Mar 2022 03:14:36 -0800 (PST) Received: from fraeml714-chm.china.huawei.com (unknown [172.18.147.200]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4K7s1F49Mvz67xLj; Wed, 2 Mar 2022 19:13:21 +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 15.1.2308.21; Wed, 2 Mar 2022 12:14:34 +0100 From: Roberto Sassu To: , , , , , , , , CC: , , , , , , Roberto Sassu Subject: [PATCH v3 3/9] bpf-lsm: Introduce new helper bpf_ima_file_hash() Date: Wed, 2 Mar 2022 12:13:58 +0100 Message-ID: <20220302111404.193900-4-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220302111404.193900-1-roberto.sassu@huawei.com> References: <20220302111404.193900-1-roberto.sassu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.204.63.22] X-ClientProxiedBy: lhreml751-chm.china.huawei.com (10.201.108.201) To fraeml714-chm.china.huawei.com (10.206.15.33) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org ima_file_hash() has been modified to calculate the measurement of a file on demand, if it has not been already performed by IMA or the measurement is not fresh. For compatibility reasons, ima_inode_hash() remains unchanged. Keep the same approach in eBPF and introduce the new helper bpf_ima_file_hash() to take advantage of the modified behavior of ima_file_hash(). Signed-off-by: Roberto Sassu --- include/uapi/linux/bpf.h | 11 +++++++++++ kernel/bpf/bpf_lsm.c | 20 ++++++++++++++++++++ tools/include/uapi/linux/bpf.h | 11 +++++++++++ 3 files changed, 42 insertions(+) diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index b0383d371b9a..87d996e954d4 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -5018,6 +5018,16 @@ union bpf_attr { * * Return * The number of arguments of the traced function. + * + * long bpf_ima_file_hash(struct file *file, void *dst, u32 size) + * Description + * Returns a calculated IMA hash of the *file*. + * If the hash is larger than *size*, then only *size* + * bytes will be copied to *dst* + * Return + * The **hash_algo** is returned on success, + * **-EOPNOTSUP** if the hash calculation failed or **-EINVAL** if + * invalid arguments are passed. */ #define __BPF_FUNC_MAPPER(FN) \ FN(unspec), \ @@ -5206,6 +5216,7 @@ union bpf_attr { FN(get_func_arg), \ FN(get_func_ret), \ FN(get_func_arg_cnt), \ + FN(ima_file_hash), \ /* */ /* integer value in 'imm' field of BPF_CALL instruction selects which helper diff --git a/kernel/bpf/bpf_lsm.c b/kernel/bpf/bpf_lsm.c index 9e4ecc990647..e8d27af5bbcc 100644 --- a/kernel/bpf/bpf_lsm.c +++ b/kernel/bpf/bpf_lsm.c @@ -99,6 +99,24 @@ static const struct bpf_func_proto bpf_ima_inode_hash_proto = { .allowed = bpf_ima_inode_hash_allowed, }; +BPF_CALL_3(bpf_ima_file_hash, struct file *, file, void *, dst, u32, size) +{ + return ima_file_hash(file, dst, size); +} + +BTF_ID_LIST_SINGLE(bpf_ima_file_hash_btf_ids, struct, file) + +static const struct bpf_func_proto bpf_ima_file_hash_proto = { + .func = bpf_ima_file_hash, + .gpl_only = false, + .ret_type = RET_INTEGER, + .arg1_type = ARG_PTR_TO_BTF_ID, + .arg1_btf_id = &bpf_ima_file_hash_btf_ids[0], + .arg2_type = ARG_PTR_TO_UNINIT_MEM, + .arg3_type = ARG_CONST_SIZE, + .allowed = bpf_ima_inode_hash_allowed, +}; + static const struct bpf_func_proto * bpf_lsm_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) { @@ -121,6 +139,8 @@ bpf_lsm_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) return &bpf_bprm_opts_set_proto; case BPF_FUNC_ima_inode_hash: return prog->aux->sleepable ? &bpf_ima_inode_hash_proto : NULL; + case BPF_FUNC_ima_file_hash: + return prog->aux->sleepable ? &bpf_ima_file_hash_proto : NULL; default: return tracing_prog_func_proto(func_id, prog); } diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index b0383d371b9a..87d996e954d4 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -5018,6 +5018,16 @@ union bpf_attr { * * Return * The number of arguments of the traced function. + * + * long bpf_ima_file_hash(struct file *file, void *dst, u32 size) + * Description + * Returns a calculated IMA hash of the *file*. + * If the hash is larger than *size*, then only *size* + * bytes will be copied to *dst* + * Return + * The **hash_algo** is returned on success, + * **-EOPNOTSUP** if the hash calculation failed or **-EINVAL** if + * invalid arguments are passed. */ #define __BPF_FUNC_MAPPER(FN) \ FN(unspec), \ @@ -5206,6 +5216,7 @@ union bpf_attr { FN(get_func_arg), \ FN(get_func_ret), \ FN(get_func_arg_cnt), \ + FN(ima_file_hash), \ /* */ /* integer value in 'imm' field of BPF_CALL instruction selects which helper From patchwork Wed Mar 2 11:13:59 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 12765806 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 48BDEC433EF for ; Wed, 2 Mar 2022 11:15:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241388AbiCBLQG (ORCPT ); Wed, 2 Mar 2022 06:16:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54414 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241433AbiCBLPz (ORCPT ); Wed, 2 Mar 2022 06:15:55 -0500 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DEA38606EA; Wed, 2 Mar 2022 03:14:38 -0800 (PST) Received: from fraeml714-chm.china.huawei.com (unknown [172.18.147.206]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4K7s1G60fNz67nGY; Wed, 2 Mar 2022 19:13:22 +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 15.1.2308.21; Wed, 2 Mar 2022 12:14:34 +0100 From: Roberto Sassu To: , , , , , , , , CC: , , , , , , Roberto Sassu Subject: [PATCH v3 4/9] selftests/bpf: Move sample generation code to ima_test_common() Date: Wed, 2 Mar 2022 12:13:59 +0100 Message-ID: <20220302111404.193900-5-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220302111404.193900-1-roberto.sassu@huawei.com> References: <20220302111404.193900-1-roberto.sassu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.204.63.22] X-ClientProxiedBy: lhreml751-chm.china.huawei.com (10.201.108.201) To fraeml714-chm.china.huawei.com (10.206.15.33) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org Move sample generator code to ima_test_common() so that the new function can be called by multiple LSM hooks. Signed-off-by: Roberto Sassu --- tools/testing/selftests/bpf/progs/ima.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/bpf/progs/ima.c b/tools/testing/selftests/bpf/progs/ima.c index 96060ff4ffc6..b5a0de50d1b4 100644 --- a/tools/testing/selftests/bpf/progs/ima.c +++ b/tools/testing/selftests/bpf/progs/ima.c @@ -18,8 +18,7 @@ struct { char _license[] SEC("license") = "GPL"; -SEC("lsm.s/bprm_committed_creds") -void BPF_PROG(ima, struct linux_binprm *bprm) +static void ima_test_common(struct file *file) { u64 ima_hash = 0; u64 *sample; @@ -28,7 +27,7 @@ void BPF_PROG(ima, struct linux_binprm *bprm) pid = bpf_get_current_pid_tgid() >> 32; if (pid == monitored_pid) { - ret = bpf_ima_inode_hash(bprm->file->f_inode, &ima_hash, + ret = bpf_ima_inode_hash(file->f_inode, &ima_hash, sizeof(ima_hash)); if (ret < 0 || ima_hash == 0) return; @@ -43,3 +42,9 @@ void BPF_PROG(ima, struct linux_binprm *bprm) return; } + +SEC("lsm.s/bprm_committed_creds") +void BPF_PROG(bprm_committed_creds, struct linux_binprm *bprm) +{ + ima_test_common(bprm->file); +} From patchwork Wed Mar 2 11:14:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 12765812 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 621A1C433EF for ; Wed, 2 Mar 2022 11:18:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241402AbiCBLT2 (ORCPT ); Wed, 2 Mar 2022 06:19:28 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51724 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241726AbiCBLSa (ORCPT ); Wed, 2 Mar 2022 06:18:30 -0500 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 24FCAC4B62; Wed, 2 Mar 2022 03:16:04 -0800 (PST) Received: from fraeml714-chm.china.huawei.com (unknown [172.18.147.206]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4K7s2n1t9Zz67Z6v; Wed, 2 Mar 2022 19:14:41 +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 15.1.2308.21; Wed, 2 Mar 2022 12:15:48 +0100 From: Roberto Sassu To: , , , , , , , , CC: , , , , , , Roberto Sassu Subject: [PATCH v3 5/9] selftests/bpf: Add test for bpf_ima_file_hash() Date: Wed, 2 Mar 2022 12:14:00 +0100 Message-ID: <20220302111404.193900-6-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220302111404.193900-1-roberto.sassu@huawei.com> References: <20220302111404.193900-1-roberto.sassu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.204.63.22] X-ClientProxiedBy: lhreml751-chm.china.huawei.com (10.201.108.201) To fraeml714-chm.china.huawei.com (10.206.15.33) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org Add new test to ensure that bpf_ima_file_hash() returns the digest of the executed files. Signed-off-by: Roberto Sassu --- .../selftests/bpf/prog_tests/test_ima.c | 43 +++++++++++++++++-- tools/testing/selftests/bpf/progs/ima.c | 10 ++++- 2 files changed, 47 insertions(+), 6 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/test_ima.c b/tools/testing/selftests/bpf/prog_tests/test_ima.c index 97d8a6f84f4a..acc911ba63fd 100644 --- a/tools/testing/selftests/bpf/prog_tests/test_ima.c +++ b/tools/testing/selftests/bpf/prog_tests/test_ima.c @@ -13,6 +13,8 @@ #include "ima.skel.h" +#define MAX_SAMPLES 2 + static int run_measured_process(const char *measured_dir, u32 *monitored_pid) { int child_pid, child_status; @@ -32,14 +34,25 @@ static int run_measured_process(const char *measured_dir, u32 *monitored_pid) return -EINVAL; } -static u64 ima_hash_from_bpf; +static u64 ima_hash_from_bpf[MAX_SAMPLES]; +static int ima_hash_from_bpf_idx; static int process_sample(void *ctx, void *data, size_t len) { - ima_hash_from_bpf = *((u64 *)data); + if (ima_hash_from_bpf_idx >= MAX_SAMPLES) + return -ENOSPC; + + ima_hash_from_bpf[ima_hash_from_bpf_idx++] = *((u64 *)data); return 0; } +static void test_init(struct ima__bss *bss) +{ + ima_hash_from_bpf_idx = 0; + + bss->use_ima_file_hash = false; +} + void test_test_ima(void) { char measured_dir_template[] = "/tmp/ima_measuredXXXXXX"; @@ -72,13 +85,35 @@ void test_test_ima(void) if (CHECK(err, "failed to run command", "%s, errno = %d\n", cmd, errno)) goto close_clean; + /* + * Test #1 + * - Goal: obtain a sample with the bpf_ima_inode_hash() helper + * - Expected result: 1 sample (/bin/true) + */ + test_init(skel->bss); err = run_measured_process(measured_dir, &skel->bss->monitored_pid); - if (CHECK(err, "run_measured_process", "err = %d\n", err)) + if (CHECK(err, "run_measured_process #1", "err = %d\n", err)) goto close_clean; err = ring_buffer__consume(ringbuf); ASSERT_EQ(err, 1, "num_samples_or_err"); - ASSERT_NEQ(ima_hash_from_bpf, 0, "ima_hash"); + ASSERT_NEQ(ima_hash_from_bpf[0], 0, "ima_hash"); + + /* + * Test #2 + * - Goal: obtain samples with the bpf_ima_file_hash() helper + * - Expected result: 2 samples (./ima_setup.sh, /bin/true) + */ + test_init(skel->bss); + skel->bss->use_ima_file_hash = true; + err = run_measured_process(measured_dir, &skel->bss->monitored_pid); + if (CHECK(err, "run_measured_process #2", "err = %d\n", err)) + goto close_clean; + + err = ring_buffer__consume(ringbuf); + ASSERT_EQ(err, 2, "num_samples_or_err"); + ASSERT_NEQ(ima_hash_from_bpf[0], 0, "ima_hash"); + ASSERT_NEQ(ima_hash_from_bpf[1], 0, "ima_hash"); close_clean: snprintf(cmd, sizeof(cmd), "./ima_setup.sh cleanup %s", measured_dir); diff --git a/tools/testing/selftests/bpf/progs/ima.c b/tools/testing/selftests/bpf/progs/ima.c index b5a0de50d1b4..e0b073dcfb5d 100644 --- a/tools/testing/selftests/bpf/progs/ima.c +++ b/tools/testing/selftests/bpf/progs/ima.c @@ -18,6 +18,8 @@ struct { char _license[] SEC("license") = "GPL"; +bool use_ima_file_hash; + static void ima_test_common(struct file *file) { u64 ima_hash = 0; @@ -27,8 +29,12 @@ static void ima_test_common(struct file *file) pid = bpf_get_current_pid_tgid() >> 32; if (pid == monitored_pid) { - ret = bpf_ima_inode_hash(file->f_inode, &ima_hash, - sizeof(ima_hash)); + if (!use_ima_file_hash) + ret = bpf_ima_inode_hash(file->f_inode, &ima_hash, + sizeof(ima_hash)); + else + ret = bpf_ima_file_hash(file, &ima_hash, + sizeof(ima_hash)); if (ret < 0 || ima_hash == 0) return; From patchwork Wed Mar 2 11:14:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 12765810 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 602CFC41535 for ; Wed, 2 Mar 2022 11:18:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240399AbiCBLTB (ORCPT ); Wed, 2 Mar 2022 06:19:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54542 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241738AbiCBLSf (ORCPT ); Wed, 2 Mar 2022 06:18:35 -0500 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B037AC4B69; Wed, 2 Mar 2022 03:16:04 -0800 (PST) Received: from fraeml714-chm.china.huawei.com (unknown [172.18.147.206]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4K7s2j4DqTz67r9d; Wed, 2 Mar 2022 19:14:37 +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 15.1.2308.21; Wed, 2 Mar 2022 12:15:49 +0100 From: Roberto Sassu To: , , , , , , , , CC: , , , , , , Roberto Sassu Subject: [PATCH v3 6/9] selftests/bpf: Check if the digest is refreshed after a file write Date: Wed, 2 Mar 2022 12:14:01 +0100 Message-ID: <20220302111404.193900-7-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220302111404.193900-1-roberto.sassu@huawei.com> References: <20220302111404.193900-1-roberto.sassu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.204.63.22] X-ClientProxiedBy: lhreml751-chm.china.huawei.com (10.201.108.201) To fraeml714-chm.china.huawei.com (10.206.15.33) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org Verify that bpf_ima_inode_hash() returns a non-fresh digest after a file write, and that bpf_ima_file_hash() returns a fresh digest. Verification is done by requesting the digest from the bprm_creds_for_exec hook, called before ima_bprm_check(). Signed-off-by: Roberto Sassu --- tools/testing/selftests/bpf/ima_setup.sh | 24 ++++++- .../selftests/bpf/prog_tests/test_ima.c | 72 ++++++++++++++++++- tools/testing/selftests/bpf/progs/ima.c | 11 +++ 3 files changed, 103 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/bpf/ima_setup.sh b/tools/testing/selftests/bpf/ima_setup.sh index 8e62581113a3..a3de1cd43ba0 100755 --- a/tools/testing/selftests/bpf/ima_setup.sh +++ b/tools/testing/selftests/bpf/ima_setup.sh @@ -12,7 +12,7 @@ LOG_FILE="$(mktemp /tmp/ima_setup.XXXX.log)" usage() { - echo "Usage: $0 " + echo "Usage: $0 " exit 1 } @@ -77,6 +77,24 @@ run() exec "${copied_bin_path}" } +modify_bin() +{ + local tmp_dir="$1" + local mount_dir="${tmp_dir}/mnt" + local copied_bin_path="${mount_dir}/$(basename ${TEST_BINARY})" + + echo "mod" >> "${copied_bin_path}" +} + +restore_bin() +{ + local tmp_dir="$1" + local mount_dir="${tmp_dir}/mnt" + local copied_bin_path="${mount_dir}/$(basename ${TEST_BINARY})" + + truncate -s -4 "${copied_bin_path}" +} + catch() { local exit_code="$1" @@ -105,6 +123,10 @@ main() cleanup "${tmp_dir}" elif [[ "${action}" == "run" ]]; then run "${tmp_dir}" + elif [[ "${action}" == "modify-bin" ]]; then + modify_bin "${tmp_dir}" + elif [[ "${action}" == "restore-bin" ]]; then + restore_bin "${tmp_dir}" else echo "Unknown action: ${action}" exit 1 diff --git a/tools/testing/selftests/bpf/prog_tests/test_ima.c b/tools/testing/selftests/bpf/prog_tests/test_ima.c index acc911ba63fd..a0cfba0b4273 100644 --- a/tools/testing/selftests/bpf/prog_tests/test_ima.c +++ b/tools/testing/selftests/bpf/prog_tests/test_ima.c @@ -13,16 +13,17 @@ #include "ima.skel.h" -#define MAX_SAMPLES 2 +#define MAX_SAMPLES 4 -static int run_measured_process(const char *measured_dir, u32 *monitored_pid) +static int _run_measured_process(const char *measured_dir, u32 *monitored_pid, + const char *cmd) { int child_pid, child_status; child_pid = fork(); if (child_pid == 0) { *monitored_pid = getpid(); - execlp("./ima_setup.sh", "./ima_setup.sh", "run", measured_dir, + execlp("./ima_setup.sh", "./ima_setup.sh", cmd, measured_dir, NULL); exit(errno); @@ -34,6 +35,11 @@ static int run_measured_process(const char *measured_dir, u32 *monitored_pid) return -EINVAL; } +static int run_measured_process(const char *measured_dir, u32 *monitored_pid) +{ + return _run_measured_process(measured_dir, monitored_pid, "run"); +} + static u64 ima_hash_from_bpf[MAX_SAMPLES]; static int ima_hash_from_bpf_idx; @@ -51,6 +57,7 @@ static void test_init(struct ima__bss *bss) ima_hash_from_bpf_idx = 0; bss->use_ima_file_hash = false; + bss->enable_bprm_creds_for_exec = false; } void test_test_ima(void) @@ -58,6 +65,7 @@ void test_test_ima(void) char measured_dir_template[] = "/tmp/ima_measuredXXXXXX"; struct ring_buffer *ringbuf = NULL; const char *measured_dir; + u64 bin_true_sample; char cmd[256]; int err, duration = 0; @@ -114,6 +122,64 @@ void test_test_ima(void) ASSERT_EQ(err, 2, "num_samples_or_err"); ASSERT_NEQ(ima_hash_from_bpf[0], 0, "ima_hash"); ASSERT_NEQ(ima_hash_from_bpf[1], 0, "ima_hash"); + bin_true_sample = ima_hash_from_bpf[1]; + + /* + * Test #3 + * - Goal: confirm that bpf_ima_inode_hash() returns a non-fresh digest + * - Expected result: 2 samples (/bin/true: non-fresh, fresh) + */ + test_init(skel->bss); + + err = _run_measured_process(measured_dir, &skel->bss->monitored_pid, + "modify-bin"); + if (CHECK(err, "modify-bin #3", "err = %d\n", err)) + goto close_clean; + + skel->bss->enable_bprm_creds_for_exec = true; + err = run_measured_process(measured_dir, &skel->bss->monitored_pid); + if (CHECK(err, "run_measured_process #3", "err = %d\n", err)) + goto close_clean; + + err = ring_buffer__consume(ringbuf); + ASSERT_EQ(err, 2, "num_samples_or_err"); + ASSERT_NEQ(ima_hash_from_bpf[0], 0, "ima_hash"); + ASSERT_NEQ(ima_hash_from_bpf[1], 0, "ima_hash"); + ASSERT_EQ(ima_hash_from_bpf[0], bin_true_sample, "sample_equal_or_err"); + /* IMA refreshed the digest. */ + ASSERT_NEQ(ima_hash_from_bpf[1], bin_true_sample, + "sample_different_or_err"); + + /* + * Test #4 + * - Goal: verify that bpf_ima_file_hash() returns a fresh digest + * - Expected result: 4 samples (./ima_setup.sh: fresh, fresh; + * /bin/true: fresh, fresh) + */ + test_init(skel->bss); + skel->bss->use_ima_file_hash = true; + skel->bss->enable_bprm_creds_for_exec = true; + err = run_measured_process(measured_dir, &skel->bss->monitored_pid); + if (CHECK(err, "run_measured_process #4", "err = %d\n", err)) + goto close_clean; + + err = ring_buffer__consume(ringbuf); + ASSERT_EQ(err, 4, "num_samples_or_err"); + ASSERT_NEQ(ima_hash_from_bpf[0], 0, "ima_hash"); + ASSERT_NEQ(ima_hash_from_bpf[1], 0, "ima_hash"); + ASSERT_NEQ(ima_hash_from_bpf[2], 0, "ima_hash"); + ASSERT_NEQ(ima_hash_from_bpf[3], 0, "ima_hash"); + ASSERT_NEQ(ima_hash_from_bpf[2], bin_true_sample, + "sample_different_or_err"); + ASSERT_EQ(ima_hash_from_bpf[3], ima_hash_from_bpf[2], + "sample_equal_or_err"); + + skel->bss->use_ima_file_hash = false; + skel->bss->enable_bprm_creds_for_exec = false; + err = _run_measured_process(measured_dir, &skel->bss->monitored_pid, + "restore-bin"); + if (CHECK(err, "restore-bin #3", "err = %d\n", err)) + goto close_clean; close_clean: snprintf(cmd, sizeof(cmd), "./ima_setup.sh cleanup %s", measured_dir); diff --git a/tools/testing/selftests/bpf/progs/ima.c b/tools/testing/selftests/bpf/progs/ima.c index e0b073dcfb5d..9633e5f2453d 100644 --- a/tools/testing/selftests/bpf/progs/ima.c +++ b/tools/testing/selftests/bpf/progs/ima.c @@ -19,6 +19,7 @@ struct { char _license[] SEC("license") = "GPL"; bool use_ima_file_hash; +bool enable_bprm_creds_for_exec; static void ima_test_common(struct file *file) { @@ -54,3 +55,13 @@ void BPF_PROG(bprm_committed_creds, struct linux_binprm *bprm) { ima_test_common(bprm->file); } + +SEC("lsm.s/bprm_creds_for_exec") +int BPF_PROG(bprm_creds_for_exec, struct linux_binprm *bprm) +{ + if (!enable_bprm_creds_for_exec) + return 0; + + ima_test_common(bprm->file); + return 0; +} From patchwork Wed Mar 2 11:14:02 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 12765809 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2182BC4167D for ; Wed, 2 Mar 2022 11:18:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239721AbiCBLTA (ORCPT ); Wed, 2 Mar 2022 06:19:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52426 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241736AbiCBLSf (ORCPT ); Wed, 2 Mar 2022 06:18:35 -0500 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 21F6FC4B78; Wed, 2 Mar 2022 03:16:04 -0800 (PST) Received: from fraeml714-chm.china.huawei.com (unknown [172.18.147.206]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4K7s2q1N2yz67bJc; Wed, 2 Mar 2022 19:14:43 +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 15.1.2308.21; Wed, 2 Mar 2022 12:15:50 +0100 From: Roberto Sassu To: , , , , , , , , CC: , , , , , , Roberto Sassu Subject: [PATCH v3 7/9] bpf-lsm: Make bpf_lsm_kernel_read_file() as sleepable Date: Wed, 2 Mar 2022 12:14:02 +0100 Message-ID: <20220302111404.193900-8-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220302111404.193900-1-roberto.sassu@huawei.com> References: <20220302111404.193900-1-roberto.sassu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.204.63.22] X-ClientProxiedBy: lhreml751-chm.china.huawei.com (10.201.108.201) To fraeml714-chm.china.huawei.com (10.206.15.33) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org Make bpf_lsm_kernel_read_file() as sleepable, so that bpf_ima_inode_hash() or bpf_ima_file_hash() can be called inside the implementation of this hook. Signed-off-by: Roberto Sassu --- kernel/bpf/bpf_lsm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/bpf/bpf_lsm.c b/kernel/bpf/bpf_lsm.c index e8d27af5bbcc..064eccba641d 100644 --- a/kernel/bpf/bpf_lsm.c +++ b/kernel/bpf/bpf_lsm.c @@ -187,6 +187,7 @@ BTF_ID(func, bpf_lsm_inode_setxattr) BTF_ID(func, bpf_lsm_inode_symlink) BTF_ID(func, bpf_lsm_inode_unlink) BTF_ID(func, bpf_lsm_kernel_module_request) +BTF_ID(func, bpf_lsm_kernel_read_file) BTF_ID(func, bpf_lsm_kernfs_init_security) #ifdef CONFIG_KEYS From patchwork Wed Mar 2 11:14:03 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 12765811 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 75EE1C3525A for ; Wed, 2 Mar 2022 11:18:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238457AbiCBLTA (ORCPT ); Wed, 2 Mar 2022 06:19:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51584 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241739AbiCBLSf (ORCPT ); Wed, 2 Mar 2022 06:18:35 -0500 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 21FDFC4B7B; Wed, 2 Mar 2022 03:16:05 -0800 (PST) Received: from fraeml714-chm.china.huawei.com (unknown [172.18.147.200]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4K7s2l3lsFz67xDf; Wed, 2 Mar 2022 19:14:39 +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 15.1.2308.21; Wed, 2 Mar 2022 12:15:51 +0100 From: Roberto Sassu To: , , , , , , , , CC: , , , , , , Roberto Sassu Subject: [PATCH v3 8/9] selftests/bpf: Add test for bpf_lsm_kernel_read_file() Date: Wed, 2 Mar 2022 12:14:03 +0100 Message-ID: <20220302111404.193900-9-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220302111404.193900-1-roberto.sassu@huawei.com> References: <20220302111404.193900-1-roberto.sassu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.204.63.22] X-ClientProxiedBy: lhreml751-chm.china.huawei.com (10.201.108.201) To fraeml714-chm.china.huawei.com (10.206.15.33) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org Test the ability of bpf_lsm_kernel_read_file() to call the sleepable functions bpf_ima_inode_hash() or bpf_ima_file_hash() to obtain a measurement of a loaded IMA policy. Signed-off-by: Roberto Sassu --- tools/testing/selftests/bpf/ima_setup.sh | 13 ++++++++++++- .../selftests/bpf/prog_tests/test_ima.c | 19 +++++++++++++++++++ tools/testing/selftests/bpf/progs/ima.c | 18 ++++++++++++++++++ 3 files changed, 49 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/ima_setup.sh b/tools/testing/selftests/bpf/ima_setup.sh index a3de1cd43ba0..8ecead4ccad0 100755 --- a/tools/testing/selftests/bpf/ima_setup.sh +++ b/tools/testing/selftests/bpf/ima_setup.sh @@ -12,7 +12,7 @@ LOG_FILE="$(mktemp /tmp/ima_setup.XXXX.log)" usage() { - echo "Usage: $0 " + echo "Usage: $0 " exit 1 } @@ -51,6 +51,7 @@ setup() ensure_mount_securityfs echo "measure func=BPRM_CHECK fsuuid=${mount_uuid}" > ${IMA_POLICY_FILE} + echo "measure func=BPRM_CHECK fsuuid=${mount_uuid}" > ${mount_dir}/policy_test } cleanup() { @@ -95,6 +96,14 @@ restore_bin() truncate -s -4 "${copied_bin_path}" } +load_policy() +{ + local tmp_dir="$1" + local mount_dir="${tmp_dir}/mnt" + + echo ${mount_dir}/policy_test > ${IMA_POLICY_FILE} 2> /dev/null +} + catch() { local exit_code="$1" @@ -127,6 +136,8 @@ main() modify_bin "${tmp_dir}" elif [[ "${action}" == "restore-bin" ]]; then restore_bin "${tmp_dir}" + elif [[ "${action}" == "load-policy" ]]; then + load_policy "${tmp_dir}" else echo "Unknown action: ${action}" exit 1 diff --git a/tools/testing/selftests/bpf/prog_tests/test_ima.c b/tools/testing/selftests/bpf/prog_tests/test_ima.c index a0cfba0b4273..b13a141c4220 100644 --- a/tools/testing/selftests/bpf/prog_tests/test_ima.c +++ b/tools/testing/selftests/bpf/prog_tests/test_ima.c @@ -58,6 +58,7 @@ static void test_init(struct ima__bss *bss) bss->use_ima_file_hash = false; bss->enable_bprm_creds_for_exec = false; + bss->enable_kernel_read_file = false; } void test_test_ima(void) @@ -181,6 +182,24 @@ void test_test_ima(void) if (CHECK(err, "restore-bin #3", "err = %d\n", err)) goto close_clean; + /* + * Test #5 + * - Goal: obtain a sample from the kernel_read_file hook + * - Expected result: 2 samples (./ima_setup.sh, policy_test) + */ + test_init(skel->bss); + skel->bss->use_ima_file_hash = true; + skel->bss->enable_kernel_read_file = true; + err = _run_measured_process(measured_dir, &skel->bss->monitored_pid, + "load-policy"); + if (CHECK(err, "run_measured_process #5", "err = %d\n", err)) + goto close_clean; + + err = ring_buffer__consume(ringbuf); + ASSERT_EQ(err, 2, "num_samples_or_err"); + ASSERT_NEQ(ima_hash_from_bpf[0], 0, "ima_hash"); + ASSERT_NEQ(ima_hash_from_bpf[1], 0, "ima_hash"); + close_clean: snprintf(cmd, sizeof(cmd), "./ima_setup.sh cleanup %s", measured_dir); err = system(cmd); diff --git a/tools/testing/selftests/bpf/progs/ima.c b/tools/testing/selftests/bpf/progs/ima.c index 9633e5f2453d..e3ce943c5c3d 100644 --- a/tools/testing/selftests/bpf/progs/ima.c +++ b/tools/testing/selftests/bpf/progs/ima.c @@ -20,6 +20,7 @@ char _license[] SEC("license") = "GPL"; bool use_ima_file_hash; bool enable_bprm_creds_for_exec; +bool enable_kernel_read_file; static void ima_test_common(struct file *file) { @@ -65,3 +66,20 @@ int BPF_PROG(bprm_creds_for_exec, struct linux_binprm *bprm) ima_test_common(bprm->file); return 0; } + +SEC("lsm.s/kernel_read_file") +int BPF_PROG(kernel_read_file, struct file *file, enum kernel_read_file_id id, + bool contents) +{ + if (!enable_kernel_read_file) + return 0; + + if (!contents) + return 0; + + if (id != READING_POLICY) + return 0; + + ima_test_common(file); + return 0; +} From patchwork Wed Mar 2 11:14:04 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 12765808 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B2DEAC433EF for ; Wed, 2 Mar 2022 11:18:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236525AbiCBLS7 (ORCPT ); Wed, 2 Mar 2022 06:18:59 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54540 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241746AbiCBLSf (ORCPT ); Wed, 2 Mar 2022 06:18:35 -0500 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4A5EDC4B7C; Wed, 2 Mar 2022 03:16:05 -0800 (PST) Received: from fraeml714-chm.china.huawei.com (unknown [172.18.147.226]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4K7s4158THz67vZB; Wed, 2 Mar 2022 19:15:45 +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 15.1.2308.21; Wed, 2 Mar 2022 12:15:52 +0100 From: Roberto Sassu To: , , , , , , , , CC: , , , , , , Roberto Sassu Subject: [PATCH v3 9/9] selftests/bpf: Check that bpf_kernel_read_file() denies reading IMA policy Date: Wed, 2 Mar 2022 12:14:04 +0100 Message-ID: <20220302111404.193900-10-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220302111404.193900-1-roberto.sassu@huawei.com> References: <20220302111404.193900-1-roberto.sassu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.204.63.22] X-ClientProxiedBy: lhreml751-chm.china.huawei.com (10.201.108.201) To fraeml714-chm.china.huawei.com (10.206.15.33) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org Check that bpf_kernel_read_file() denies the reading of an IMA policy, by ensuring that ima_setup.sh exits with an error. Signed-off-by: Roberto Sassu --- .../selftests/bpf/prog_tests/test_ima.c | 17 +++++++++++++++++ tools/testing/selftests/bpf/progs/ima.c | 18 ++++++++++++++++++ 2 files changed, 35 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/test_ima.c b/tools/testing/selftests/bpf/prog_tests/test_ima.c index b13a141c4220..b13feceb38f1 100644 --- a/tools/testing/selftests/bpf/prog_tests/test_ima.c +++ b/tools/testing/selftests/bpf/prog_tests/test_ima.c @@ -59,6 +59,7 @@ static void test_init(struct ima__bss *bss) bss->use_ima_file_hash = false; bss->enable_bprm_creds_for_exec = false; bss->enable_kernel_read_file = false; + bss->test_deny = false; } void test_test_ima(void) @@ -200,6 +201,22 @@ void test_test_ima(void) ASSERT_NEQ(ima_hash_from_bpf[0], 0, "ima_hash"); ASSERT_NEQ(ima_hash_from_bpf[1], 0, "ima_hash"); + /* + * Test #6 + * - Goal: ensure that the kernel_read_file hook denies an operation + * - Expected result: 0 samples + */ + test_init(skel->bss); + skel->bss->enable_kernel_read_file = true; + skel->bss->test_deny = true; + err = _run_measured_process(measured_dir, &skel->bss->monitored_pid, + "load-policy"); + if (CHECK(!err, "run_measured_process #6", "err = %d\n", err)) + goto close_clean; + + err = ring_buffer__consume(ringbuf); + ASSERT_EQ(err, 0, "num_samples_or_err"); + close_clean: snprintf(cmd, sizeof(cmd), "./ima_setup.sh cleanup %s", measured_dir); err = system(cmd); diff --git a/tools/testing/selftests/bpf/progs/ima.c b/tools/testing/selftests/bpf/progs/ima.c index e3ce943c5c3d..e16a2c208481 100644 --- a/tools/testing/selftests/bpf/progs/ima.c +++ b/tools/testing/selftests/bpf/progs/ima.c @@ -21,6 +21,7 @@ char _license[] SEC("license") = "GPL"; bool use_ima_file_hash; bool enable_bprm_creds_for_exec; bool enable_kernel_read_file; +bool test_deny; static void ima_test_common(struct file *file) { @@ -51,6 +52,17 @@ static void ima_test_common(struct file *file) return; } +static int ima_test_deny(void) +{ + u32 pid; + + pid = bpf_get_current_pid_tgid() >> 32; + if (pid == monitored_pid && test_deny) + return -EPERM; + + return 0; +} + SEC("lsm.s/bprm_committed_creds") void BPF_PROG(bprm_committed_creds, struct linux_binprm *bprm) { @@ -71,6 +83,8 @@ SEC("lsm.s/kernel_read_file") int BPF_PROG(kernel_read_file, struct file *file, enum kernel_read_file_id id, bool contents) { + int ret; + if (!enable_kernel_read_file) return 0; @@ -80,6 +94,10 @@ int BPF_PROG(kernel_read_file, struct file *file, enum kernel_read_file_id id, if (id != READING_POLICY) return 0; + ret = ima_test_deny(); + if (ret < 0) + return ret; + ima_test_common(file); return 0; }