From patchwork Wed Aug 9 19:53:13 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nayna Jain X-Patchwork-Id: 13348438 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 AF6ADC0015E for ; Wed, 9 Aug 2023 19:54:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231298AbjHITx4 (ORCPT ); Wed, 9 Aug 2023 15:53:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32992 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230497AbjHITxw (ORCPT ); Wed, 9 Aug 2023 15:53:52 -0400 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E715810DC; Wed, 9 Aug 2023 12:53:51 -0700 (PDT) Received: from pps.filterd (m0353723.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 379JrMXm025237; Wed, 9 Aug 2023 19:53:44 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=2K+xOl9iCiEdHbs8U9vWbwZhgSfvBN7iaw7oWsKkQPc=; b=Ih8MoIR6k2J1Xn+pNxWJcL+GvRA86qstbQVvgssiSAMpnNISG6SCK8sRTAagXPN6Afg4 MuRTXXnF/Q140GaDY6P1qgUfWiN4nHz9+lonOzrMyBpg/7GxKomX/Ps2rTbKf6locc/i hzkvFXAREYbTzPblJTabFqj9gXEydY4wzpOFAHS/GxYV45FpJ8BvB8tlK50IZ8HyF56H lWHd++xTckUdpF5H9UyLYUIBbkwZfHCaVEnuJxeOfffAgrlMQqpi0AZRI+ZMifys97vg 8IIT6+JhXW6pa4rAKDsC5zi/hGyquqGUE1w/08CcnbyCvFCGDgY5W5k3XfCbhSTkRA1+ 6A== Received: from ppma22.wdc07v.mail.ibm.com (5c.69.3da9.ip4.static.sl-reverse.com [169.61.105.92]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3schbn8071-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 09 Aug 2023 19:53:43 +0000 Received: from pps.filterd (ppma22.wdc07v.mail.ibm.com [127.0.0.1]) by ppma22.wdc07v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 379IaVjG007573; Wed, 9 Aug 2023 19:53:43 GMT Received: from smtprelay06.fra02v.mail.ibm.com ([9.218.2.230]) by ppma22.wdc07v.mail.ibm.com (PPS) with ESMTPS id 3sa14ykjxj-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 09 Aug 2023 19:53:42 +0000 Received: from smtpav01.fra02v.mail.ibm.com (smtpav01.fra02v.mail.ibm.com [10.20.54.100]) by smtprelay06.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 379Jrdsx32703162 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 9 Aug 2023 19:53:40 GMT Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D48EE20043; Wed, 9 Aug 2023 19:53:39 +0000 (GMT) Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B623E20040; Wed, 9 Aug 2023 19:53:37 +0000 (GMT) Received: from li-4b5937cc-25c4-11b2-a85c-cea3a66903e4.ibm.com (unknown [9.61.3.84]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 9 Aug 2023 19:53:37 +0000 (GMT) From: Nayna Jain To: linux-integrity@vger.kernel.org Cc: Mimi Zohar , Jarkko Sakkinen , Eric Snowberg , Paul Moore , linuxppc-dev , linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, Nayna Jain Subject: [PATCH v2 4/6] integrity: check whether imputed trust is enabled Date: Wed, 9 Aug 2023 15:53:13 -0400 Message-Id: <20230809195315.1085656-5-nayna@linux.ibm.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20230809195315.1085656-1-nayna@linux.ibm.com> References: <20230809195315.1085656-1-nayna@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: YkRxITWoHoezWme_NbkY_sfwWuSH0JQy X-Proofpoint-ORIG-GUID: YkRxITWoHoezWme_NbkY_sfwWuSH0JQy X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-08-09_17,2023-08-09_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 lowpriorityscore=0 mlxlogscore=999 impostorscore=0 bulkscore=0 malwarescore=0 clxscore=1015 priorityscore=1501 suspectscore=0 mlxscore=0 spamscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2306200000 definitions=main-2308090171 Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org trust_moklist() is specific to UEFI enabled systems. Other platforms rely only on the Kconfig. Define a generic wrapper named imputed_trust_enabled(). Signed-off-by: Nayna Jain Reviewed-off-by: Mimi Zohar --- security/integrity/digsig.c | 2 +- security/integrity/integrity.h | 5 +++-- .../integrity/platform_certs/keyring_handler.c | 3 ++- .../integrity/platform_certs/machine_keyring.c | 18 ++++++++++++++++-- 4 files changed, 22 insertions(+), 6 deletions(-) diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c index d0704b1597d4..df387de29bfa 100644 --- a/security/integrity/digsig.c +++ b/security/integrity/digsig.c @@ -113,7 +113,7 @@ static int __init __integrity_init_keyring(const unsigned int id, } else { if (id == INTEGRITY_KEYRING_PLATFORM) set_platform_trusted_keys(keyring[id]); - if (id == INTEGRITY_KEYRING_MACHINE && trust_moklist()) + if (id == INTEGRITY_KEYRING_MACHINE && imputed_trust_enabled()) set_machine_trusted_keys(keyring[id]); if (id == INTEGRITY_KEYRING_IMA) load_module_cert(keyring[id]); diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h index 7167a6e99bdc..d7553c93f5c0 100644 --- a/security/integrity/integrity.h +++ b/security/integrity/integrity.h @@ -320,13 +320,14 @@ static inline void __init add_to_platform_keyring(const char *source, #ifdef CONFIG_INTEGRITY_MACHINE_KEYRING void __init add_to_machine_keyring(const char *source, const void *data, size_t len); -bool __init trust_moklist(void); +bool __init imputed_trust_enabled(void); #else static inline void __init add_to_machine_keyring(const char *source, const void *data, size_t len) { } -static inline bool __init trust_moklist(void) + +static inline bool __init imputed_trust_enabled(void) { return false; } diff --git a/security/integrity/platform_certs/keyring_handler.c b/security/integrity/platform_certs/keyring_handler.c index 1649d047e3b8..586027b9a3f5 100644 --- a/security/integrity/platform_certs/keyring_handler.c +++ b/security/integrity/platform_certs/keyring_handler.c @@ -61,7 +61,8 @@ __init efi_element_handler_t get_handler_for_db(const efi_guid_t *sig_type) __init efi_element_handler_t get_handler_for_mok(const efi_guid_t *sig_type) { if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0) { - if (IS_ENABLED(CONFIG_INTEGRITY_MACHINE_KEYRING) && trust_moklist()) + if (IS_ENABLED(CONFIG_INTEGRITY_MACHINE_KEYRING) && + imputed_trust_enabled()) return add_to_machine_keyring; else return add_to_platform_keyring; diff --git a/security/integrity/platform_certs/machine_keyring.c b/security/integrity/platform_certs/machine_keyring.c index 9482e16cb2ca..a401640a63cd 100644 --- a/security/integrity/platform_certs/machine_keyring.c +++ b/security/integrity/platform_certs/machine_keyring.c @@ -34,7 +34,8 @@ void __init add_to_machine_keyring(const char *source, const void *data, size_t * If the restriction check does not pass and the platform keyring * is configured, try to add it into that keyring instead. */ - if (rc && efi_enabled(EFI_BOOT) && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING)) + if (rc && efi_enabled(EFI_BOOT) && + IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING)) rc = integrity_load_cert(INTEGRITY_KEYRING_PLATFORM, source, data, len, perm); @@ -60,7 +61,7 @@ static __init bool uefi_check_trust_mok_keys(void) return false; } -bool __init trust_moklist(void) +static bool __init trust_moklist(void) { static bool initialized; static bool trust_mok; @@ -75,3 +76,16 @@ bool __init trust_moklist(void) return trust_mok; } + +/* + * Provides platform specific check for trusting imputed keys before loading + * on .machine keyring. UEFI systems enable this trust based on a variable, + * and for other platforms, it is always enabled. + */ +bool __init imputed_trust_enabled(void) +{ + if (efi_enabled(EFI_BOOT)) + return trust_moklist(); + + return true; +}