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From: Bruno Meneguele <bmeneg@redhat.com>
To: Maurizio Drocco <maurizio.drocco@ibm.com>
Cc: zohar@linux.ibm.com, Silviu.Vlasceanu@huawei.com,
	dmitry.kasatkin@gmail.com, jejb@linux.ibm.com, jmorris@namei.org,
	linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	mdrocco@linux.vnet.ibm.com, roberto.sassu@huawei.com,
	serge@hallyn.com
Subject: Re: [PATCH v2] ima_evm_utils: extended calc_bootaggr to PCRs 8 - 9
Date: Tue, 23 Jun 2020 15:13:57 -0300
Message-ID: <20200623181357.GC4983@glitch> (raw)
In-Reply-To: <20200623180122.209-1-maurizio.drocco@ibm.com>


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On Tue, Jun 23, 2020 at 02:01:22PM -0400, Maurizio Drocco wrote:
> From: Maurizio <maurizio.drocco@ibm.com>
> 
> If PCRs 8 - 9 are set (i.e. not all-zeros), cal_bootaggr should include
> them into the digest.
> 
> Signed-off-by: Maurizio Drocco <maurizio.drocco@ibm.com>
> ---
> Changelog:
> v2:
> - Always include PCRs 8 & 9 to non-sha1 hashes
> v1:
> - Include non-zero PCRs 8 & 9 to boot aggregates 
> 
>  src/evmctl.c | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/src/evmctl.c b/src/evmctl.c
> index 1d065ce..46b7092 100644
> --- a/src/evmctl.c
> +++ b/src/evmctl.c
> @@ -1930,6 +1930,16 @@ static void calc_bootaggr(struct tpm_bank_info *bank)
>  		}
>  	}
>  
> +	if (strcmp(bank->algo_name, "sha1") != 0) {
> +		for (i = 8; i < 10; i++) {
> +			err = EVP_DigestUpdate(pctx, bank->pcr[i], bank->digest_size);
> +			if (!err) {
> +				log_err("EVP_DigestUpdate() failed\n");
> +				return;
> +			}
> +		}
> +	}
> +
>  	err = EVP_DigestFinal(pctx, bank->digest, &mdlen);
>  	if (!err) {
>  		log_err("EVP_DigestFinal() failed\n");
> @@ -1972,8 +1982,9 @@ static int append_bootaggr(char *bootaggr, struct tpm_bank_info *tpm_banks)
>  /*
>   * The IMA measurement list boot_aggregate is the link between the preboot
>   * event log and the IMA measurement list.  Read and calculate all the
> - * possible per TPM bank boot_aggregate digests based on the existing
> - * PCRs 0 - 7 to validate against the IMA boot_aggregate record.
> + * possible per TPM bank boot_aggregate digests based on the existing PCRs
> + * 0 - 9 to validate against the IMA boot_aggregate record. If the digest
> + * algorithm is SHA1, only PCRs 0 - 7 are considered to avoid ambiguity.
>   */
>  static int cmd_ima_bootaggr(struct command *cmd)
>  {
> -- 
> 2.17.1
> 

Reviewed-by: Bruno Meneguele <bmeneg@redhat.com>

-- 
bmeneg 
PGP Key: http://bmeneg.com/pubkey.txt

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  reply index

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-11 19:54 [PATCH] extend IMA boot_aggregate with kernel measurements Maurizio Drocco
2020-06-12  0:29 ` Mimi Zohar
2020-06-12 14:38   ` Maurizio Drocco
2020-06-12 15:11     ` Roberto Sassu
2020-06-12 17:14       ` James Bottomley
2020-06-16 17:29         ` Roberto Sassu
2020-06-16 18:11           ` Mimi Zohar
2020-06-18 12:38             ` Roberto Sassu
2020-06-18 20:11               ` Maurizio Drocco
2020-06-18 20:11                 ` [PATCH] ima_evm_utils: extended calc_bootaggr to PCRs 8 - 9 Maurizio Drocco
2020-06-22 20:14                   ` Mimi Zohar
2020-06-22  4:50                     ` [PATCH] ima: extend boot_aggregate with kernel measurements Maurizio Drocco
2020-06-23 14:03                       ` Mimi Zohar
2020-06-23 15:57                         ` [PATCH v4] " Maurizio Drocco
2020-06-23 18:53                           ` Bruno Meneguele
2020-06-23 18:01                     ` [PATCH v2] ima_evm_utils: extended calc_bootaggr to PCRs 8 - 9 Maurizio Drocco
2020-06-23 18:13                       ` Bruno Meneguele [this message]
2020-06-24 21:17                         ` Stefan Berger
2020-06-24 21:33                           ` [PATCH] " Maurizio Drocco
2020-06-24 21:33                           ` [PATCH v2] " Bruno Meneguele
2020-06-24 21:35                             ` [PATCH v3] " Maurizio Drocco
2020-06-24 21:50                               ` Bruno Meneguele

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