From: Lakshmi Ramasubramanian <nramas@linux.microsoft.com> To: zohar@linux.ibm.com, dhowells@redhat.com, matthewgarrett@google.com, sashal@kernel.org, jamorris@linux.microsoft.com, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, keyrings@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 03/10] IMA: Added keyrings= option in IMA policy to only measure keys added to the specified keyrings. Date: Wed, 6 Nov 2019 11:01:09 -0800 Message-ID: <20191106190116.2578-4-nramas@linux.microsoft.com> (raw) In-Reply-To: <20191106190116.2578-1-nramas@linux.microsoft.com> IMA policy needs to support measuring only those keys linked to a specific set of keyrings. This patch defines a new IMA policy option namely "keyrings=" that can be used to specify a set of keyrings. If this option is specified in the policy for func=KEYRING_CHECK then only the keys linked to the keyrings given in "keyrings=" option are measured. If "keyrings=" option is not specified for func=KEYRING_CHECK then all keys are measured. Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com> --- Documentation/ABI/testing/ima_policy | 10 +++++++++- security/integrity/ima/ima_policy.c | 2 ++ 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/Documentation/ABI/testing/ima_policy b/Documentation/ABI/testing/ima_policy index 341df49b5ad1..be2874fa3928 100644 --- a/Documentation/ABI/testing/ima_policy +++ b/Documentation/ABI/testing/ima_policy @@ -25,7 +25,7 @@ Description: lsm: [[subj_user=] [subj_role=] [subj_type=] [obj_user=] [obj_role=] [obj_type=]] option: [[appraise_type=]] [template=] [permit_directio] - [appraise_flag=] + [appraise_flag=] [keyrings=] base: func:= [BPRM_CHECK][MMAP_CHECK][CREDS_CHECK][FILE_CHECK][MODULE_CHECK] [FIRMWARE_CHECK] [KEXEC_KERNEL_CHECK] [KEXEC_INITRAMFS_CHECK] @@ -43,6 +43,9 @@ Description: appraise_flag:= [check_blacklist] Currently, blacklist check is only for files signed with appended signature. + keyrings:= list of keyrings + (eg, .builtin_trusted_keys|.ima). Only valid + when action is "measure" and func is KEYRING_CHECK. template:= name of a defined IMA template type (eg, ima-ng). Only valid when action is "measure". pcr:= decimal value @@ -119,3 +122,8 @@ Description: all keys: measure func=KEYRING_CHECK + + Example of measure rule using KEYRING_CHECK to only measure + keys added to .builtin_trusted_keys or .ima keyring: + + measure func=KEYRING_CHECK keyrings=.builtin_trusted_keys|.ima diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index 4344b7354fc5..4d68ad8ed91c 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -34,6 +34,7 @@ #define IMA_EUID 0x0080 #define IMA_PCR 0x0100 #define IMA_FSNAME 0x0200 +#define IMA_KEYRINGS 0x0400 #define UNKNOWN 0 #define MEASURE 0x0001 /* same as IMA_MEASURE */ @@ -79,6 +80,7 @@ struct ima_rule_entry { int type; /* audit type */ } lsm[MAX_LSM_RULES]; char *fsname; + char *keyrings; /* Measure keys added to these keyrings */ struct ima_template_desc *template; }; -- 2.17.1
next prev parent reply index Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-11-06 19:01 [PATCH v4 0/10] KEYS: Measure keys when they are created or updated Lakshmi Ramasubramanian 2019-11-06 19:01 ` [PATCH v4 01/10] IMA: Defined an IMA hook to measure keys on key create or update Lakshmi Ramasubramanian 2019-11-06 22:43 ` Mimi Zohar 2019-11-07 0:21 ` Lakshmi Ramasubramanian 2019-11-07 3:40 ` Mimi Zohar 2019-11-07 18:42 ` Lakshmi Ramasubramanian 2019-11-07 20:53 ` Mimi Zohar 2019-11-07 21:12 ` Lakshmi Ramasubramanian 2019-11-06 19:01 ` [PATCH v4 02/10] IMA: Added KEYRING_CHECK func in IMA policy to measure keys Lakshmi Ramasubramanian 2019-11-06 19:01 ` Lakshmi Ramasubramanian [this message] 2019-11-06 19:01 ` [PATCH v4 04/10] IMA: Read keyrings= option from the IMA policy into ima_rule_entry Lakshmi Ramasubramanian 2019-11-06 19:01 ` [PATCH v4 05/10] IMA: Updated IMA policy functions to return keyrings option read from the policy Lakshmi Ramasubramanian 2019-11-06 19:01 ` [PATCH v4 06/10] IMA: Measure key if the IMA policy allows measurement for the keyring to which the key is linked to Lakshmi Ramasubramanian 2019-11-06 19:01 ` [PATCH v4 07/10] IMA: Added a boolean flag to track IMA initialization status Lakshmi Ramasubramanian 2019-11-06 19:01 ` [PATCH v4 08/10] IMA: Defined functions to queue and dequeue keys for measurement Lakshmi Ramasubramanian 2019-11-06 22:44 ` Mimi Zohar 2019-11-06 23:52 ` Lakshmi Ramasubramanian 2019-11-07 2:20 ` Lakshmi Ramasubramanian 2019-11-06 19:01 ` [PATCH v4 09/10] IMA: Call queue and dequeue functions to measure keys Lakshmi Ramasubramanian 2019-11-06 19:01 ` [PATCH v4 10/10] KEYS: Call the IMA hook to measure key when a new key is created or an existing key is updated Lakshmi Ramasubramanian
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