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spf=tempfail smtp.mailfrom=dm-devel-bounces@redhat.com Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-290-YEOE0WErNb6Q3fysoY6_HA-1; Fri, 11 Dec 2020 06:48:09 -0500 X-MC-Unique: YEOE0WErNb6Q3fysoY6_HA-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id DE643CC621; Fri, 11 Dec 2020 11:48:04 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.20]) by smtp.corp.redhat.com (Postfix) with ESMTPS id BA1D91972B; Fri, 11 Dec 2020 11:48:04 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id 8E8C7180954D; Fri, 11 Dec 2020 11:48:04 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id 0BAMd2a7017800 for ; Thu, 10 Dec 2020 17:39:03 -0500 Received: by smtp.corp.redhat.com (Postfix) id C84BF2166B29; Thu, 10 Dec 2020 22:39:02 +0000 (UTC) Received: from mimecast-mx02.redhat.com (mimecast04.extmail.prod.ext.rdu2.redhat.com [10.11.55.20]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C06872166B2A for ; Thu, 10 Dec 2020 22:39:00 +0000 (UTC) Received: from us-smtp-1.mimecast.com (us-smtp-1.mimecast.com [207.211.31.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A042A1010428 for ; Thu, 10 Dec 2020 22:39:00 +0000 (UTC) Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by relay.mimecast.com with ESMTP id us-mta-421-59FfmwgcNcCtWeQihBxmkA-1; Thu, 10 Dec 2020 17:38:58 -0500 X-MC-Unique: 59FfmwgcNcCtWeQihBxmkA-1 Received: from sequoia (162-237-133-238.lightspeed.rcsntx.sbcglobal.net [162.237.133.238]) by linux.microsoft.com (Postfix) with ESMTPSA id 0893C20B717A; Thu, 10 Dec 2020 14:38:55 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 0893C20B717A Date: Thu, 10 Dec 2020 16:38:54 -0600 From: Tyler Hicks To: Tushar Sugandhi Message-ID: <20201210223854.GG489768@sequoia> References: <20201209194212.5131-1-tusharsu@linux.microsoft.com> <20201209194212.5131-3-tusharsu@linux.microsoft.com> MIME-Version: 1.0 In-Reply-To: <20201209194212.5131-3-tusharsu@linux.microsoft.com> X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 X-loop: dm-devel@redhat.com X-Mailman-Approved-At: Fri, 11 Dec 2020 06:47:16 -0500 Cc: sashal@kernel.org, paul@paul-moore.com, snitzer@redhat.com, selinux@vger.kernel.org, stephen.smalley.work@gmail.com, jmorris@namei.org, zohar@linux.ibm.com, linux-kernel@vger.kernel.org, nramas@linux.microsoft.com, linux-security-module@vger.kernel.org, casey@schaufler-ca.com, linux-integrity@vger.kernel.org, dm-devel@redhat.com, gmazyland@gmail.com, agk@redhat.com Subject: Re: [dm-devel] [PATCH v7 2/8] IMA: add support to measure buffer data hash X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On 2020-12-09 11:42:06, Tushar Sugandhi wrote: > The original IMA buffer data measurement sizes were small (e.g. boot > command line), but the new buffer data measurement use cases have data > sizes that are a lot larger. Just as IMA measures the file data hash, > not the file data, IMA should similarly support the option for measuring > the hash of the buffer data. > > Measuring in-memory buffer-data/buffer-data-hash is different than > measuring file-data/file-data-hash. For the file, IMA stores the > measurements in both measurement log and the file's extended attribute - > which can later be used for appraisal as well. For buffer, the > measurements are only stored in the IMA log, since the buffer has no > extended attributes associated with it. > > Introduce a boolean parameter measure_buf_hash to support measuring > hash of a buffer, which would be much smaller, instead of the buffer > itself. > > Signed-off-by: Tushar Sugandhi > --- > security/integrity/ima/ima.h | 3 +- > security/integrity/ima/ima_appraise.c | 2 +- > security/integrity/ima/ima_asymmetric_keys.c | 2 +- > security/integrity/ima/ima_main.c | 36 +++++++++++++++++--- > security/integrity/ima/ima_queue_keys.c | 3 +- > 5 files changed, 38 insertions(+), 8 deletions(-) > > diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h > index e5622ce8cbb1..fa3044a7539f 100644 > --- a/security/integrity/ima/ima.h > +++ b/security/integrity/ima/ima.h > @@ -268,7 +268,8 @@ void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, > struct ima_template_desc *template_desc); > void process_buffer_measurement(struct inode *inode, const void *buf, int size, > const char *eventname, enum ima_hooks func, > - int pcr, const char *func_data); > + int pcr, const char *func_data, > + bool measure_buf_hash); > void ima_audit_measurement(struct integrity_iint_cache *iint, > const unsigned char *filename); > int ima_alloc_init_template(struct ima_event_data *event_data, > diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c > index 8361941ee0a1..46ffa38bab12 100644 > --- a/security/integrity/ima/ima_appraise.c > +++ b/security/integrity/ima/ima_appraise.c > @@ -352,7 +352,7 @@ int ima_check_blacklist(struct integrity_iint_cache *iint, > if ((rc == -EPERM) && (iint->flags & IMA_MEASURE)) > process_buffer_measurement(NULL, digest, digestsize, > "blacklisted-hash", NONE, > - pcr, NULL); > + pcr, NULL, false); > } > > return rc; > diff --git a/security/integrity/ima/ima_asymmetric_keys.c b/security/integrity/ima/ima_asymmetric_keys.c > index 1c68c500c26f..a74095793936 100644 > --- a/security/integrity/ima/ima_asymmetric_keys.c > +++ b/security/integrity/ima/ima_asymmetric_keys.c > @@ -60,5 +60,5 @@ void ima_post_key_create_or_update(struct key *keyring, struct key *key, > */ > process_buffer_measurement(NULL, payload, payload_len, > keyring->description, KEY_CHECK, 0, > - keyring->description); > + keyring->description, false); > } > diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c > index e76ef4bfd0f4..03aad13e9e70 100644 > --- a/security/integrity/ima/ima_main.c > +++ b/security/integrity/ima/ima_main.c > @@ -779,7 +779,7 @@ int ima_post_load_data(char *buf, loff_t size, > } > > /* > - * process_buffer_measurement - Measure the buffer to ima log. > + * process_buffer_measurement - Measure the buffer or the buffer data hash > * @inode: inode associated with the object being measured (NULL for KEY_CHECK) > * @buf: pointer to the buffer that needs to be added to the log. > * @size: size of buffer(in bytes). > @@ -787,12 +787,23 @@ int ima_post_load_data(char *buf, loff_t size, > * @func: IMA hook > * @pcr: pcr to extend the measurement > * @func_data: private data specific to @func, can be NULL. > + * @measure_buf_hash: measure buffer hash > * > - * Based on policy, the buffer is measured into the ima log. > + * Measure the buffer into the IMA log, and extend the @pcr. > + * > + * Determine what buffers are allowed to be measured, based on the policy rules > + * and the IMA hook passed using @func. > + * > + * Use @func_data, if provided, to match against the measurement policy rule > + * data for @func. > + * > + * If @measure_buf_hash is set to true - measure hash of the buffer data, > + * else measure the buffer data itself. > */ > void process_buffer_measurement(struct inode *inode, const void *buf, int size, > const char *eventname, enum ima_hooks func, > - int pcr, const char *func_data) > + int pcr, const char *func_data, > + bool measure_buf_hash) > { > int ret = 0; > const char *audit_cause = "ENOMEM"; > @@ -807,6 +818,8 @@ void process_buffer_measurement(struct inode *inode, const void *buf, int size, > struct ima_digest_data hdr; > char digest[IMA_MAX_DIGEST_SIZE]; > } hash = {}; > + char buf_hash[IMA_MAX_DIGEST_SIZE]; > + int buf_hash_len = hash_digest_size[ima_hash_algo]; > int violation = 0; > int action = 0; > u32 secid; > @@ -849,6 +862,20 @@ void process_buffer_measurement(struct inode *inode, const void *buf, int size, > goto out; > } > > + if (measure_buf_hash) { > + memcpy(buf_hash, hash.hdr.digest, buf_hash_len); > + > + ret = ima_calc_buffer_hash(buf_hash, buf_hash_len, > + iint.ima_hash); > + if (ret < 0) { > + audit_cause = "measure_buf_hash_error"; > + goto out; > + } > + > + event_data.buf = buf_hash; > + event_data.buf_len = buf_hash_len; > + } > + > ret = ima_alloc_init_template(&event_data, &entry, template); > if (ret < 0) { > audit_cause = "alloc_entry"; A few more lines below, not present in this context, is a call to ima_store_template() with buf as the fourth parameter passed in. That parameter eventually makes its way to integrity_audit_message() and ends up as part of an audit message as the value of the "name=" field. This is usually a filename, the name of a key, or a kexec cmdline. In the case of measuring SELinux policy, do we want the entire buf to be included in the audit message? Tyler > @@ -890,7 +917,8 @@ void ima_kexec_cmdline(int kernel_fd, const void *buf, int size) > return; > > process_buffer_measurement(file_inode(f.file), buf, size, > - "kexec-cmdline", KEXEC_CMDLINE, 0, NULL); > + "kexec-cmdline", KEXEC_CMDLINE, 0, NULL, > + false); > fdput(f); > } > > diff --git a/security/integrity/ima/ima_queue_keys.c b/security/integrity/ima/ima_queue_keys.c > index 69a8626a35c0..c2f2ad34f9b7 100644 > --- a/security/integrity/ima/ima_queue_keys.c > +++ b/security/integrity/ima/ima_queue_keys.c > @@ -162,7 +162,8 @@ void ima_process_queued_keys(void) > entry->payload_len, > entry->keyring_name, > KEY_CHECK, 0, > - entry->keyring_name); > + entry->keyring_name, > + false); > list_del(&entry->list); > ima_free_key_entry(entry); > } > -- > 2.17.1 > -- dm-devel mailing list dm-devel@redhat.com https://www.redhat.com/mailman/listinfo/dm-devel From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-23.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D2F88C1B0E3 for ; Thu, 10 Dec 2020 23:03:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B75D723B85 for ; Thu, 10 Dec 2020 23:03:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728462AbgLJXCO (ORCPT ); Thu, 10 Dec 2020 18:02:14 -0500 Received: from linux.microsoft.com ([13.77.154.182]:34560 "EHLO linux.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731559AbgLJXBz (ORCPT ); Thu, 10 Dec 2020 18:01:55 -0500 Received: from sequoia (162-237-133-238.lightspeed.rcsntx.sbcglobal.net [162.237.133.238]) by linux.microsoft.com (Postfix) with ESMTPSA id 0893C20B717A; Thu, 10 Dec 2020 14:38:55 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 0893C20B717A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1607639937; bh=zCKDPK/Mols2hyMNyMd1n0ZAchRN1KoGVSt3lHhjwgI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=TtVYhy8/vlk0tai1qcfmIrPfRn/7N0V3tXw8VmeVhSonUhtWUwgeUnsBiYzn91XEU V7DP0tM6jSB268GVMOq5Kaivt562tKg5dYdVIIyC72J0koU1634mp88CqlOk47gtf0 J2/Mr+1nY7BWfMfkBw8XpPWwc0AQIzNTQVNjQ3c4= Date: Thu, 10 Dec 2020 16:38:54 -0600 From: Tyler Hicks To: Tushar Sugandhi Cc: zohar@linux.ibm.com, stephen.smalley.work@gmail.com, casey@schaufler-ca.com, agk@redhat.com, snitzer@redhat.com, gmazyland@gmail.com, paul@paul-moore.com, sashal@kernel.org, jmorris@namei.org, nramas@linux.microsoft.com, linux-integrity@vger.kernel.org, selinux@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, dm-devel@redhat.com Subject: Re: [PATCH v7 2/8] IMA: add support to measure buffer data hash Message-ID: <20201210223854.GG489768@sequoia> References: <20201209194212.5131-1-tusharsu@linux.microsoft.com> <20201209194212.5131-3-tusharsu@linux.microsoft.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201209194212.5131-3-tusharsu@linux.microsoft.com> Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org On 2020-12-09 11:42:06, Tushar Sugandhi wrote: > The original IMA buffer data measurement sizes were small (e.g. boot > command line), but the new buffer data measurement use cases have data > sizes that are a lot larger. Just as IMA measures the file data hash, > not the file data, IMA should similarly support the option for measuring > the hash of the buffer data. > > Measuring in-memory buffer-data/buffer-data-hash is different than > measuring file-data/file-data-hash. For the file, IMA stores the > measurements in both measurement log and the file's extended attribute - > which can later be used for appraisal as well. For buffer, the > measurements are only stored in the IMA log, since the buffer has no > extended attributes associated with it. > > Introduce a boolean parameter measure_buf_hash to support measuring > hash of a buffer, which would be much smaller, instead of the buffer > itself. > > Signed-off-by: Tushar Sugandhi > --- > security/integrity/ima/ima.h | 3 +- > security/integrity/ima/ima_appraise.c | 2 +- > security/integrity/ima/ima_asymmetric_keys.c | 2 +- > security/integrity/ima/ima_main.c | 36 +++++++++++++++++--- > security/integrity/ima/ima_queue_keys.c | 3 +- > 5 files changed, 38 insertions(+), 8 deletions(-) > > diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h > index e5622ce8cbb1..fa3044a7539f 100644 > --- a/security/integrity/ima/ima.h > +++ b/security/integrity/ima/ima.h > @@ -268,7 +268,8 @@ void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, > struct ima_template_desc *template_desc); > void process_buffer_measurement(struct inode *inode, const void *buf, int size, > const char *eventname, enum ima_hooks func, > - int pcr, const char *func_data); > + int pcr, const char *func_data, > + bool measure_buf_hash); > void ima_audit_measurement(struct integrity_iint_cache *iint, > const unsigned char *filename); > int ima_alloc_init_template(struct ima_event_data *event_data, > diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c > index 8361941ee0a1..46ffa38bab12 100644 > --- a/security/integrity/ima/ima_appraise.c > +++ b/security/integrity/ima/ima_appraise.c > @@ -352,7 +352,7 @@ int ima_check_blacklist(struct integrity_iint_cache *iint, > if ((rc == -EPERM) && (iint->flags & IMA_MEASURE)) > process_buffer_measurement(NULL, digest, digestsize, > "blacklisted-hash", NONE, > - pcr, NULL); > + pcr, NULL, false); > } > > return rc; > diff --git a/security/integrity/ima/ima_asymmetric_keys.c b/security/integrity/ima/ima_asymmetric_keys.c > index 1c68c500c26f..a74095793936 100644 > --- a/security/integrity/ima/ima_asymmetric_keys.c > +++ b/security/integrity/ima/ima_asymmetric_keys.c > @@ -60,5 +60,5 @@ void ima_post_key_create_or_update(struct key *keyring, struct key *key, > */ > process_buffer_measurement(NULL, payload, payload_len, > keyring->description, KEY_CHECK, 0, > - keyring->description); > + keyring->description, false); > } > diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c > index e76ef4bfd0f4..03aad13e9e70 100644 > --- a/security/integrity/ima/ima_main.c > +++ b/security/integrity/ima/ima_main.c > @@ -779,7 +779,7 @@ int ima_post_load_data(char *buf, loff_t size, > } > > /* > - * process_buffer_measurement - Measure the buffer to ima log. > + * process_buffer_measurement - Measure the buffer or the buffer data hash > * @inode: inode associated with the object being measured (NULL for KEY_CHECK) > * @buf: pointer to the buffer that needs to be added to the log. > * @size: size of buffer(in bytes). > @@ -787,12 +787,23 @@ int ima_post_load_data(char *buf, loff_t size, > * @func: IMA hook > * @pcr: pcr to extend the measurement > * @func_data: private data specific to @func, can be NULL. > + * @measure_buf_hash: measure buffer hash > * > - * Based on policy, the buffer is measured into the ima log. > + * Measure the buffer into the IMA log, and extend the @pcr. > + * > + * Determine what buffers are allowed to be measured, based on the policy rules > + * and the IMA hook passed using @func. > + * > + * Use @func_data, if provided, to match against the measurement policy rule > + * data for @func. > + * > + * If @measure_buf_hash is set to true - measure hash of the buffer data, > + * else measure the buffer data itself. > */ > void process_buffer_measurement(struct inode *inode, const void *buf, int size, > const char *eventname, enum ima_hooks func, > - int pcr, const char *func_data) > + int pcr, const char *func_data, > + bool measure_buf_hash) > { > int ret = 0; > const char *audit_cause = "ENOMEM"; > @@ -807,6 +818,8 @@ void process_buffer_measurement(struct inode *inode, const void *buf, int size, > struct ima_digest_data hdr; > char digest[IMA_MAX_DIGEST_SIZE]; > } hash = {}; > + char buf_hash[IMA_MAX_DIGEST_SIZE]; > + int buf_hash_len = hash_digest_size[ima_hash_algo]; > int violation = 0; > int action = 0; > u32 secid; > @@ -849,6 +862,20 @@ void process_buffer_measurement(struct inode *inode, const void *buf, int size, > goto out; > } > > + if (measure_buf_hash) { > + memcpy(buf_hash, hash.hdr.digest, buf_hash_len); > + > + ret = ima_calc_buffer_hash(buf_hash, buf_hash_len, > + iint.ima_hash); > + if (ret < 0) { > + audit_cause = "measure_buf_hash_error"; > + goto out; > + } > + > + event_data.buf = buf_hash; > + event_data.buf_len = buf_hash_len; > + } > + > ret = ima_alloc_init_template(&event_data, &entry, template); > if (ret < 0) { > audit_cause = "alloc_entry"; A few more lines below, not present in this context, is a call to ima_store_template() with buf as the fourth parameter passed in. That parameter eventually makes its way to integrity_audit_message() and ends up as part of an audit message as the value of the "name=" field. This is usually a filename, the name of a key, or a kexec cmdline. In the case of measuring SELinux policy, do we want the entire buf to be included in the audit message? Tyler > @@ -890,7 +917,8 @@ void ima_kexec_cmdline(int kernel_fd, const void *buf, int size) > return; > > process_buffer_measurement(file_inode(f.file), buf, size, > - "kexec-cmdline", KEXEC_CMDLINE, 0, NULL); > + "kexec-cmdline", KEXEC_CMDLINE, 0, NULL, > + false); > fdput(f); > } > > diff --git a/security/integrity/ima/ima_queue_keys.c b/security/integrity/ima/ima_queue_keys.c > index 69a8626a35c0..c2f2ad34f9b7 100644 > --- a/security/integrity/ima/ima_queue_keys.c > +++ b/security/integrity/ima/ima_queue_keys.c > @@ -162,7 +162,8 @@ void ima_process_queued_keys(void) > entry->payload_len, > entry->keyring_name, > KEY_CHECK, 0, > - entry->keyring_name); > + entry->keyring_name, > + false); > list_del(&entry->list); > ima_free_key_entry(entry); > } > -- > 2.17.1 >