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Mon, 25 Apr 2022 22:21:31 +0000 Received: from CH2PR10MB4150.namprd10.prod.outlook.com ([fe80::7ded:5b3:a28f:2e55]) by CH2PR10MB4150.namprd10.prod.outlook.com ([fe80::7ded:5b3:a28f:2e55%5]) with mapi id 15.20.5186.021; Mon, 25 Apr 2022 22:21:31 +0000 From: Eric Snowberg To: zohar@linux.ibm.com Cc: dmitry.kasatkin@gmail.com, jmorris@namei.org, serge@hallyn.com, eric.snowberg@oracle.com, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] integrity: Allow ima_appraise bootparam to be set when SB is enabled Date: Mon, 25 Apr 2022 18:21:20 -0400 Message-Id: <20220425222120.1998888-1-eric.snowberg@oracle.com> X-Mailer: git-send-email 2.27.0 X-ClientProxiedBy: BY3PR04CA0016.namprd04.prod.outlook.com (2603:10b6:a03:217::21) To CH2PR10MB4150.namprd10.prod.outlook.com (2603:10b6:610:ac::13) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: e2974f27-cf64-46e9-8f7f-08da2709f25a X-MS-TrafficTypeDiagnostic: DM6PR10MB3228:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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When booting with Secure Boot enabled, all modes are ignored except enforce. To use log or fix, Secure Boot must be disabled. With a policy such as: appraise func=BPRM_CHECK appraise_type=imasig A user may just want to audit signature validation. Not all users are interested in full enforcement and find the audit log appropriate for their use case. Add a new IMA_APPRAISE_SB_BOOTPARAM config allowing "ima_appraise=" to work when Secure Boot is enabled. Signed-off-by: Eric Snowberg --- security/integrity/ima/Kconfig | 9 +++++++++ security/integrity/ima/ima_appraise.c | 2 +- 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig index f3a9cc201c8c..66d25345e478 100644 --- a/security/integrity/ima/Kconfig +++ b/security/integrity/ima/Kconfig @@ -237,6 +237,15 @@ config IMA_APPRAISE_BOOTPARAM This option enables the different "ima_appraise=" modes (eg. fix, log) from the boot command line. +config IMA_APPRAISE_SB_BOOTPARAM + bool "ima_appraise secure boot parameter" + depends on IMA_APPRAISE_BOOTPARAM + default n + help + This option enables the different "ima_appraise=" modes + (eg. fix, log) from the boot command line when booting + with Secure Boot enabled. + config IMA_APPRAISE_MODSIG bool "Support module-style signatures for appraisal" depends on IMA_APPRAISE diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c index 17232bbfb9f9..a66b1e271806 100644 --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -43,7 +43,7 @@ void __init ima_appraise_parse_cmdline(void) /* If appraisal state was changed, but secure boot is enabled, * keep its default */ - if (sb_state) { + if (sb_state && !IS_ENABLED(CONFIG_IMA_APPRAISE_SB_BOOTPARAM)) { if (!(appraisal_state & IMA_APPRAISE_ENFORCE)) pr_info("Secure boot enabled: ignoring ima_appraise=%s option", str);