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From: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
To: Tyler Hicks <tyhicks@linux.microsoft.com>,
	Mimi Zohar <zohar@linux.ibm.com>,
	Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
Cc: James Morris <jmorris@namei.org>,
	"Serge E . Hallyn" <serge@hallyn.com>,
	Prakhar Srivastava <prsriva02@gmail.com>,
	linux-kernel@vger.kernel.org, linux-integrity@vger.kernel.org,
	linux-security-module@vger.kernel.org
Subject: Re: [PATCH v2 09/11] ima: Move validation of the keyrings conditional into ima_validate_rule()
Date: Sat, 27 Jun 2020 16:49:46 -0700
Message-ID: <0e7012e7-e1df-466d-9d51-a691f779570a@linux.microsoft.com> (raw)
In-Reply-To: <20200626223900.253615-10-tyhicks@linux.microsoft.com>

On 6/26/20 3:38 PM, Tyler Hicks wrote:

> Use ima_validate_rule() to ensure that the combination of a hook
> function and the keyrings conditional is valid and that the keyrings
> conditional is not specified without an explicit KEY_CHECK func
> conditional. This is a code cleanup and has no user-facing change.

In addition to checking for func=KEY_CHECK and the keyrings conditional, 
the patch also validates the flags for other IMA hooks (such as 
KEXEC_KERNEL_CHECK, POLICY_CHECK, etc.) Would be good to mention that in 
the patch description.

  -lakshmi

> 
> Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com>
> ---
> 
> * v2
>    - Allowed IMA_DIGSIG_REQUIRED, IMA_PERMIT_DIRECTIO,
>      IMA_MODSIG_ALLOWED, and IMA_CHECK_BLACKLIST conditionals to be
>      present in the rule entry flags for non-buffer hook functions.
> 
>   security/integrity/ima/ima_policy.c | 13 +++++++++++--
>   1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
> index 8cdca2399d59..43d49ad958fb 100644
> --- a/security/integrity/ima/ima_policy.c
> +++ b/security/integrity/ima/ima_policy.c
> @@ -1000,6 +1000,15 @@ static bool ima_validate_rule(struct ima_rule_entry *entry)
>   		case KEXEC_KERNEL_CHECK:
>   		case KEXEC_INITRAMFS_CHECK:
>   		case POLICY_CHECK:
> +			if (entry->flags & ~(IMA_FUNC | IMA_MASK | IMA_FSMAGIC |
> +					     IMA_UID | IMA_FOWNER | IMA_FSUUID |
> +					     IMA_INMASK | IMA_EUID | IMA_PCR |
> +					     IMA_FSNAME | IMA_DIGSIG_REQUIRED |
> +					     IMA_PERMIT_DIRECTIO |
> +					     IMA_MODSIG_ALLOWED |
> +					     IMA_CHECK_BLACKLIST))
> +				return false;
> +
>   			break;
>   		case KEXEC_CMDLINE:
>   			if (entry->action & ~(MEASURE | DONT_MEASURE))
> @@ -1027,7 +1036,8 @@ static bool ima_validate_rule(struct ima_rule_entry *entry)
>   		default:
>   			return false;
>   		}
> -	}
> +	} else if (entry->flags & IMA_KEYRINGS)
> +		return false;
>   
>   	return true;
>   }
> @@ -1209,7 +1219,6 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
>   			keyrings_len = strlen(args[0].from) + 1;
>   
>   			if ((entry->keyrings) ||
> -			    (entry->func != KEY_CHECK) ||
>   			    (keyrings_len < 2)) {
>   				result = -EINVAL;
>   				break;
> 


  reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-26 22:38 [PATCH v2 00/11] ima: Fix rule parsing bugs and extend KEXEC_CMDLINE rule support Tyler Hicks
2020-06-26 22:38 ` [PATCH v2 01/11] ima: Have the LSM free its audit rule Tyler Hicks
2020-06-26 22:38 ` [PATCH v2 02/11] ima: Free the entire rule when deleting a list of rules Tyler Hicks
2020-06-26 22:38 ` [PATCH v2 03/11] ima: Free the entire rule if it fails to parse Tyler Hicks
2020-06-26 22:38 ` [PATCH v2 04/11] ima: Fail rule parsing when buffer hook functions have an invalid action Tyler Hicks
2020-06-26 22:38 ` [PATCH v2 05/11] ima: Fail rule parsing when the KEXEC_CMDLINE hook is combined with an invalid cond Tyler Hicks
2020-06-27 23:40   ` Lakshmi Ramasubramanian
2020-06-26 22:38 ` [PATCH v2 06/11] ima: Fail rule parsing when the KEY_CHECK " Tyler Hicks
2020-06-27 23:39   ` Lakshmi Ramasubramanian
2020-06-26 22:38 ` [PATCH v2 07/11] ima: Shallow copy the args_p member of ima_rule_entry.lsm elements Tyler Hicks
2020-06-26 22:38 ` [PATCH v2 08/11] ima: Use correct type for " Tyler Hicks
2020-06-26 22:38 ` [PATCH v2 09/11] ima: Move validation of the keyrings conditional into ima_validate_rule() Tyler Hicks
2020-06-27 23:49   ` Lakshmi Ramasubramanian [this message]
2020-06-29 14:16     ` Tyler Hicks
2020-06-30 23:07   ` Mimi Zohar
2020-07-02 22:16     ` Tyler Hicks
2020-07-03 14:15       ` Mimi Zohar
2020-07-06 13:18         ` Tyler Hicks
2020-07-07  3:18           ` Mimi Zohar
2020-06-26 22:38 ` [PATCH v2 10/11] ima: Use the common function to detect LSM conditionals in a rule Tyler Hicks
2020-06-26 22:39 ` [PATCH v2 11/11] ima: Support additional conditionals in the KEXEC_CMDLINE hook function Tyler Hicks
2020-06-28  0:03   ` Lakshmi Ramasubramanian
2020-07-01  8:04   ` Dave Young
2020-07-01 14:38     ` Tyler Hicks
2020-07-01  0:29 ` [PATCH v2 00/11] ima: Fix rule parsing bugs and extend KEXEC_CMDLINE rule support Mimi Zohar

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