From patchwork Thu Aug 31 11:37:58 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 13371393 X-Patchwork-Delegate: paul@paul-moore.com 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 1248EC83F34 for ; Thu, 31 Aug 2023 11:39:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344036AbjHaLjZ (ORCPT ); Thu, 31 Aug 2023 07:39:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53550 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231672AbjHaLjY (ORCPT ); Thu, 31 Aug 2023 07:39:24 -0400 Received: from frasgout11.his.huawei.com (unknown [14.137.139.23]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2F776BC; Thu, 31 Aug 2023 04:39:21 -0700 (PDT) Received: from mail02.huawei.com (unknown [172.18.147.229]) by frasgout11.his.huawei.com (SkyGuard) with ESMTP id 4RbzQr3hldz9xFQH; Thu, 31 Aug 2023 19:27:16 +0800 (CST) Received: from huaweicloud.com (unknown [10.204.63.22]) by APP1 (Coremail) with SMTP id LxC2BwDHebm+e_BkHQreAQ--.24451S2; Thu, 31 Aug 2023 12:38:52 +0100 (CET) From: Roberto Sassu To: viro@zeniv.linux.org.uk, brauner@kernel.org, chuck.lever@oracle.com, jlayton@kernel.org, neilb@suse.de, kolga@netapp.com, Dai.Ngo@oracle.com, tom@talpey.com, zohar@linux.ibm.com, dmitry.kasatkin@gmail.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, dhowells@redhat.com, jarkko@kernel.org, stephen.smalley.work@gmail.com, eparis@parisplace.org, casey@schaufler-ca.com Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, keyrings@vger.kernel.org, selinux@vger.kernel.org, Roberto Sassu , Stefan Berger Subject: [PATCH v2 20/25] security: Introduce key_post_create_or_update hook Date: Thu, 31 Aug 2023 13:37:58 +0200 Message-Id: <20230831113803.910630-1-roberto.sassu@huaweicloud.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230831104136.903180-1-roberto.sassu@huaweicloud.com> References: <20230831104136.903180-1-roberto.sassu@huaweicloud.com> MIME-Version: 1.0 X-CM-TRANSID: LxC2BwDHebm+e_BkHQreAQ--.24451S2 X-Coremail-Antispam: 1UD129KBjvJXoWxCFWruF13Jw45ZFWUJr4Utwb_yoWrWw18pa yYk3W5K3yFkFyaqrZxAF17Way5t3y0gry7K39xWw1rtFnYqa1xXr42kFn8CrW3XryfA340 va17Zr43GrnFyrJanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUkFb4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4 vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Jr0_JF4l84ACjcxK6xIIjxv20xvEc7Cj xVAFwI0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVWxJVW8Jr1l84ACjcxK6I8E87Iv6xkF7I 0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40E x7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x 0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lFIxGxcIEc7CjxVA2Y2ka0xkIwI1l42xK82IY c2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s 026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r4a6rW5MIIYrxkI7VAKI48JMIIF 0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0x vE42xK8VAvwI8IcIk0rVWrJr0_WFyUJwCI42IY6I8E87Iv67AKxVW8JVWxJwCI42IY6I8E 87Iv6xkF7I0E14v26rxl6s0DYxBIdaVFxhVjvjDU0xZFpf9x07UAkuxUUUUU= X-CM-SenderInfo: purev21wro2thvvxqx5xdzvxpfor3voofrz/1tbiAgAGBF1jj49drAAAsP X-CFilter-Loop: Reflected Precedence: bulk List-ID: From: Roberto Sassu In preparation for moving IMA and EVM to the LSM infrastructure, introduce the key_post_create_or_update hook. Signed-off-by: Roberto Sassu Reviewed-by: Stefan Berger --- include/linux/lsm_hook_defs.h | 3 +++ include/linux/security.h | 11 +++++++++++ security/keys/key.c | 7 ++++++- security/security.c | 19 +++++++++++++++++++ 4 files changed, 39 insertions(+), 1 deletion(-) diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h index eedc26790a07..7512b4c46aa8 100644 --- a/include/linux/lsm_hook_defs.h +++ b/include/linux/lsm_hook_defs.h @@ -399,6 +399,9 @@ LSM_HOOK(void, LSM_RET_VOID, key_free, struct key *key) LSM_HOOK(int, 0, key_permission, key_ref_t key_ref, const struct cred *cred, enum key_need_perm need_perm) LSM_HOOK(int, 0, key_getsecurity, struct key *key, char **buffer) +LSM_HOOK(void, LSM_RET_VOID, key_post_create_or_update, struct key *keyring, + struct key *key, const void *payload, size_t payload_len, + unsigned long flags, bool create) #endif /* CONFIG_KEYS */ #ifdef CONFIG_AUDIT diff --git a/include/linux/security.h b/include/linux/security.h index e543ae80309b..f50b78481753 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -1959,6 +1959,9 @@ void security_key_free(struct key *key); int security_key_permission(key_ref_t key_ref, const struct cred *cred, enum key_need_perm need_perm); int security_key_getsecurity(struct key *key, char **_buffer); +void security_key_post_create_or_update(struct key *keyring, struct key *key, + const void *payload, size_t payload_len, + unsigned long flags, bool create); #else @@ -1986,6 +1989,14 @@ static inline int security_key_getsecurity(struct key *key, char **_buffer) return 0; } +static inline void security_key_post_create_or_update(struct key *keyring, + struct key *key, + const void *payload, + size_t payload_len, + unsigned long flags, + bool create) +{ } + #endif #endif /* CONFIG_KEYS */ diff --git a/security/keys/key.c b/security/keys/key.c index 5c0c7df833f8..0f9c6faf3491 100644 --- a/security/keys/key.c +++ b/security/keys/key.c @@ -934,6 +934,8 @@ static key_ref_t __key_create_or_update(key_ref_t keyring_ref, goto error_link_end; } + security_key_post_create_or_update(keyring, key, payload, plen, flags, + true); ima_post_key_create_or_update(keyring, key, payload, plen, flags, true); @@ -967,10 +969,13 @@ static key_ref_t __key_create_or_update(key_ref_t keyring_ref, key_ref = __key_update(key_ref, &prep); - if (!IS_ERR(key_ref)) + if (!IS_ERR(key_ref)) { + security_key_post_create_or_update(keyring, key, payload, plen, + flags, false); ima_post_key_create_or_update(keyring, key, payload, plen, flags, false); + } goto error_free_prep; } diff --git a/security/security.c b/security/security.c index 32c3dc34432e..e6783c2f0c65 100644 --- a/security/security.c +++ b/security/security.c @@ -5169,6 +5169,25 @@ int security_key_getsecurity(struct key *key, char **buffer) *buffer = NULL; return call_int_hook(key_getsecurity, 0, key, buffer); } + +/** + * security_key_post_create_or_update() - Notification of key create or update + * @keyring: keyring to which the key is linked to + * @key: created or updated key + * @payload: data used to instantiate or update the key + * @payload_len: length of payload + * @flags: key flags + * @create: flag indicating whether the key was created or updated + * + * Notify the caller of a key creation or update. + */ +void security_key_post_create_or_update(struct key *keyring, struct key *key, + const void *payload, size_t payload_len, + unsigned long flags, bool create) +{ + call_void_hook(key_post_create_or_update, keyring, key, payload, + payload_len, flags, create); +} #endif /* CONFIG_KEYS */ #ifdef CONFIG_AUDIT