From patchwork Wed May 23 00:12:41 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thiago Jung Bauermann X-Patchwork-Id: 10419939 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A957D6016C for ; Wed, 23 May 2018 00:29:52 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9927128DAE for ; Wed, 23 May 2018 00:29:52 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8DB7E28E17; Wed, 23 May 2018 00:29:52 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CF7A328DAE for ; Wed, 23 May 2018 00:29:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753441AbeEWAZw (ORCPT ); Tue, 22 May 2018 20:25:52 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:35276 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753588AbeEWAZs (ORCPT ); Tue, 22 May 2018 20:25:48 -0400 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w4N0K5DR050122 for ; Tue, 22 May 2018 20:25:48 -0400 Received: from e32.co.us.ibm.com (e32.co.us.ibm.com [32.97.110.150]) by mx0b-001b2d01.pphosted.com with ESMTP id 2j4ueuvrpg-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 22 May 2018 20:25:47 -0400 Received: from localhost by e32.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Tue, 22 May 2018 18:25:43 -0600 Received: from b01ledav006.gho.pok.ibm.com (b01ledav006.gho.pok.ibm.com [9.57.199.111]) by b01cxnp23033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w4N0ERbj58064994; Wed, 23 May 2018 00:14:27 GMT Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 38C6CAC041; Tue, 22 May 2018 20:15:57 -0400 (EDT) Received: from morokweng.localdomain.com (unknown [9.80.193.181]) by b01ledav006.gho.pok.ibm.com (Postfix) with ESMTP id 8C053AC046; Tue, 22 May 2018 20:15:51 -0400 (EDT) From: Thiago Jung Bauermann To: linux-integrity@vger.kernel.org Cc: linux-security-module@vger.kernel.org, keyrings@vger.kernel.org, linux-crypto@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Mimi Zohar , Dmitry Kasatkin , James Morris , "Serge E. Hallyn" , David Howells , David Woodhouse , Jessica Yu , Herbert Xu , "David S. Miller" , "AKASHI, Takahiro" , Thiago Jung Bauermann Subject: [PATCH v7 02/14] PKCS#7: Refactor verify_pkcs7_signature() and add pkcs7_get_message_sig() Date: Tue, 22 May 2018 21:12:41 -0300 X-Mailer: git-send-email 2.16.2 In-Reply-To: <20180523001253.15247-1-bauerman@linux.ibm.com> References: <20180523001253.15247-1-bauerman@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18052300-0004-0000-0000-000014237B78 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009068; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000261; SDB=6.01036241; UDB=6.00530093; IPR=6.00815369; MB=3.00021248; MTD=3.00000008; XFM=3.00000015; UTC=2018-05-23 00:25:46 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18052300-0005-0000-0000-000087514955 Message-Id: <20180523001253.15247-3-bauerman@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2018-05-22_09:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=3 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1805230002 Sender: linux-integrity-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP IMA will need to verify a PKCS#7 which has already been parsed. For this reason, factor out the code which does that from verify_pkcs7_signature() into a new function which takes a struct pkcs7_message instead of a data buffer. In addition, IMA will need to know the key that signed a given PKCS#7 message, so add pkcs7_get_message_sig(). Signed-off-by: Thiago Jung Bauermann Reviewed-by: Mimi Zohar Cc: David Howells Cc: David Woodhouse Cc: Herbert Xu Cc: "David S. Miller" --- certs/system_keyring.c | 61 ++++++++++++++++++++++++++--------- crypto/asymmetric_keys/pkcs7_parser.c | 16 +++++++++ include/crypto/pkcs7.h | 2 ++ include/linux/verification.h | 10 ++++++ 4 files changed, 73 insertions(+), 16 deletions(-) diff --git a/certs/system_keyring.c b/certs/system_keyring.c index 6251d1b27f0c..7ddc8b7a3062 100644 --- a/certs/system_keyring.c +++ b/certs/system_keyring.c @@ -190,33 +190,27 @@ late_initcall(load_system_certificate_list); #ifdef CONFIG_SYSTEM_DATA_VERIFICATION /** - * verify_pkcs7_signature - Verify a PKCS#7-based signature on system data. + * verify_pkcs7_message_sig - Verify a PKCS#7-based signature on system data. * @data: The data to be verified (NULL if expecting internal data). * @len: Size of @data. - * @raw_pkcs7: The PKCS#7 message that is the signature. - * @pkcs7_len: The size of @raw_pkcs7. + * @pkcs7: The PKCS#7 message that is the signature. * @trusted_keys: Trusted keys to use (NULL for builtin trusted keys only, * (void *)1UL for all trusted keys). * @usage: The use to which the key is being put. * @view_content: Callback to gain access to content. * @ctx: Context for callback. */ -int verify_pkcs7_signature(const void *data, size_t len, - const void *raw_pkcs7, size_t pkcs7_len, - struct key *trusted_keys, - enum key_being_used_for usage, - int (*view_content)(void *ctx, - const void *data, size_t len, - size_t asn1hdrlen), - void *ctx) +int verify_pkcs7_message_sig(const void *data, size_t len, + struct pkcs7_message *pkcs7, + struct key *trusted_keys, + enum key_being_used_for usage, + int (*view_content)(void *ctx, + const void *data, size_t len, + size_t asn1hdrlen), + void *ctx) { - struct pkcs7_message *pkcs7; int ret; - pkcs7 = pkcs7_parse_message(raw_pkcs7, pkcs7_len); - if (IS_ERR(pkcs7)) - return PTR_ERR(pkcs7); - /* The data should be detached - so we need to supply it. */ if (data && pkcs7_supply_detached_data(pkcs7, data, len) < 0) { pr_err("PKCS#7 signature with non-detached data\n"); @@ -258,6 +252,41 @@ int verify_pkcs7_signature(const void *data, size_t len, } error: + pr_devel("<==%s() = %d\n", __func__, ret); + return ret; +} + +/** + * verify_pkcs7_signature - Verify a PKCS#7-based signature on system data. + * @data: The data to be verified (NULL if expecting internal data). + * @len: Size of @data. + * @raw_pkcs7: The PKCS#7 message that is the signature. + * @pkcs7_len: The size of @raw_pkcs7. + * @trusted_keys: Trusted keys to use (NULL for builtin trusted keys only, + * (void *)1UL for all trusted keys). + * @usage: The use to which the key is being put. + * @view_content: Callback to gain access to content. + * @ctx: Context for callback. + */ +int verify_pkcs7_signature(const void *data, size_t len, + const void *raw_pkcs7, size_t pkcs7_len, + struct key *trusted_keys, + enum key_being_used_for usage, + int (*view_content)(void *ctx, + const void *data, size_t len, + size_t asn1hdrlen), + void *ctx) +{ + struct pkcs7_message *pkcs7; + int ret; + + pkcs7 = pkcs7_parse_message(raw_pkcs7, pkcs7_len); + if (IS_ERR(pkcs7)) + return PTR_ERR(pkcs7); + + ret = verify_pkcs7_message_sig(data, len, pkcs7, trusted_keys, usage, + view_content, ctx); + pkcs7_free_message(pkcs7); pr_devel("<==%s() = %d\n", __func__, ret); return ret; diff --git a/crypto/asymmetric_keys/pkcs7_parser.c b/crypto/asymmetric_keys/pkcs7_parser.c index 0f134162cef4..4c7a00734e03 100644 --- a/crypto/asymmetric_keys/pkcs7_parser.c +++ b/crypto/asymmetric_keys/pkcs7_parser.c @@ -683,3 +683,19 @@ int pkcs7_note_signed_info(void *context, size_t hdrlen, return -ENOMEM; return 0; } + +/** + * pkcs7_get_message_sig - get signature in @pkcs7 + */ +const struct public_key_signature *pkcs7_get_message_sig( + const struct pkcs7_message *pkcs7) +{ + /* + * This function doesn't support messages with more than one signature, + * so don't return anything in that case. + */ + if (pkcs7->signed_infos == NULL || pkcs7->signed_infos->next != NULL) + return NULL; + + return pkcs7->signed_infos->sig; +} diff --git a/include/crypto/pkcs7.h b/include/crypto/pkcs7.h index 583f199400a3..6f51d0cb6d12 100644 --- a/include/crypto/pkcs7.h +++ b/include/crypto/pkcs7.h @@ -28,6 +28,8 @@ extern void pkcs7_free_message(struct pkcs7_message *pkcs7); extern int pkcs7_get_content_data(const struct pkcs7_message *pkcs7, const void **_data, size_t *_datalen, size_t *_headerlen); +extern const struct public_key_signature *pkcs7_get_message_sig( + const struct pkcs7_message *pkcs7); /* * pkcs7_trust.c diff --git a/include/linux/verification.h b/include/linux/verification.h index a10549a6c7cd..f04dac2728ec 100644 --- a/include/linux/verification.h +++ b/include/linux/verification.h @@ -29,6 +29,7 @@ extern const char *const key_being_used_for[NR__KEY_BEING_USED_FOR]; #ifdef CONFIG_SYSTEM_DATA_VERIFICATION struct key; +struct pkcs7_message; extern int verify_pkcs7_signature(const void *data, size_t len, const void *raw_pkcs7, size_t pkcs7_len, @@ -38,6 +39,15 @@ extern int verify_pkcs7_signature(const void *data, size_t len, const void *data, size_t len, size_t asn1hdrlen), void *ctx); +extern int verify_pkcs7_message_sig(const void *data, size_t len, + struct pkcs7_message *pkcs7, + struct key *trusted_keys, + enum key_being_used_for usage, + int (*view_content)(void *ctx, + const void *data, + size_t len, + size_t asn1hdrlen), + void *ctx); #ifdef CONFIG_SIGNED_PE_FILE_VERIFICATION extern int verify_pefile_signature(const void *pebuf, unsigned pelen,