linux-kernel - Re: [PATCH v1 3/6] KEYS: ima hook to measure builtin_trusted

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Message-Id: <1571836931.5104.95.camel@linux.ibm.com>
Date:   Wed, 23 Oct 2019 09:22:11 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
        dhowells@...hat.com, casey@...aufler-ca.com, sashal@...nel.org,
        jamorris@...ux.microsoft.com,
        linux-security-module@...r.kernel.org,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        keyrings@...r.kernel.org
Subject: Re: [PATCH v1 3/6] KEYS: ima hook to measure builtin_trusted_keys

On Tue, 2019-10-22 at 17:18 -0700, Lakshmi Ramasubramanian wrote:
> Add a new ima hook to measure keys added to builtin_trusted_keys
> keyring.

There is no IMA hook in this patch.

> 
> Updated ima_match_rules function to handle the new ima hook.
> This is used to determine if ima policy requires measurement
> of keys added to builtin_trusted_keys keyring.
> 
> Signed-off-by: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
> ---
>  Documentation/ABI/testing/ima_policy | 1 +
>  security/integrity/ima/ima.h         | 1 +
>  security/integrity/ima/ima_api.c     | 1 +
>  security/integrity/ima/ima_policy.c  | 5 ++++-
>  4 files changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/ABI/testing/ima_policy b/Documentation/ABI/testing/ima_policy
> index fc376a323908..25566c74e679 100644
> --- a/Documentation/ABI/testing/ima_policy
> +++ b/Documentation/ABI/testing/ima_policy
> @@ -29,6 +29,7 @@ Description:
>  				[FIRMWARE_CHECK]
>  				[KEXEC_KERNEL_CHECK] [KEXEC_INITRAMFS_CHECK]
>  				[KEXEC_CMDLINE]
> +				[BUILTIN_TRUSTED_KEYS]
>  			mask:= [[^]MAY_READ] [[^]MAY_WRITE] [[^]MAY_APPEND]
>  			       [[^]MAY_EXEC]
>  			fsmagic:= hex value
> diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
> index b6847ee1f47a..0d2908036882 100644
> --- a/security/integrity/ima/ima.h
> +++ b/security/integrity/ima/ima.h
> @@ -189,6 +189,7 @@ static inline unsigned long ima_hash_key(u8 *digest)
>  	hook(KEXEC_INITRAMFS_CHECK)	\
>  	hook(POLICY_CHECK)		\
>  	hook(KEXEC_CMDLINE)		\
> +	hook(BUILTIN_TRUSTED_KEYS)	\
>  	hook(MAX_CHECK)
>  #define __ima_hook_enumify(ENUM)	ENUM,
>  
> diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
> index f614e22bf39f..cc04706b7e7a 100644
> --- a/security/integrity/ima/ima_api.c
> +++ b/security/integrity/ima/ima_api.c
> @@ -175,6 +175,7 @@ void ima_add_violation(struct file *file, const unsigned char *filename,
>   *	subj,obj, and type: are LSM specific.
>   *	func: FILE_CHECK | BPRM_CHECK | CREDS_CHECK | MMAP_CHECK | MODULE_CHECK
>   *	| KEXEC_CMDLINE
> + *	| BUILTIN_TRUSTED_KEYS
>   *	mask: contains the permission mask
>   *	fsmagic: hex value
>   *
> diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
> index 6df7f641ff66..944636076152 100644
> --- a/security/integrity/ima/ima_policy.c
> +++ b/security/integrity/ima/ima_policy.c
> @@ -370,7 +370,7 @@ static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode,
>  {
>  	int i;
>  
> -	if (func == KEXEC_CMDLINE) {
> +	if ((func == KEXEC_CMDLINE) || (func == BUILTIN_TRUSTED_KEYS)) {
>  		if ((rule->flags & IMA_FUNC) && (rule->func == func))
>  			return true;
>  		return false;
> @@ -959,6 +959,9 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
>  				entry->func = POLICY_CHECK;
>  			else if (strcmp(args[0].from, "KEXEC_CMDLINE") == 0)
>  				entry->func = KEXEC_CMDLINE;
> +			else if (strcmp(args[0].from,
> +					"BUILTIN_TRUSTED_KEYS") == 0)
> +				entry->func = BUILTIN_TRUSTED_KEYS;
>  			else
>  				result = -EINVAL;
>  			if (!result)

Any new options need to be displayed as well.

Mimi