From patchwork Fri Nov 16 20:07:11 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: 10686991 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BE9CB17F3 for ; Fri, 16 Nov 2018 20:09:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B0C4F2CE15 for ; Fri, 16 Nov 2018 20:09:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A3A952D6EA; Fri, 16 Nov 2018 20:09:31 +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=-6.9 required=2.0 tests=BAYES_00,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 4D36D2D6E5 for ; Fri, 16 Nov 2018 20:09:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730092AbeKQGXS (ORCPT ); Sat, 17 Nov 2018 01:23:18 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:38412 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730399AbeKQGXS (ORCPT ); Sat, 17 Nov 2018 01:23:18 -0500 Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id wAGK8vSK020263 for ; Fri, 16 Nov 2018 15:09:29 -0500 Received: from e14.ny.us.ibm.com (e14.ny.us.ibm.com [129.33.205.204]) by mx0a-001b2d01.pphosted.com with ESMTP id 2nt1kmfgwn-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 16 Nov 2018 15:09:29 -0500 Received: from localhost by e14.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 16 Nov 2018 20:09:21 -0000 Received: from b01ledav006.gho.pok.ibm.com (b01ledav006.gho.pok.ibm.com [9.57.199.111]) by b01cxnp22034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id wAGK9Kca66715868 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 16 Nov 2018 20:09:20 GMT Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C363AAC059; Fri, 16 Nov 2018 20:09:20 +0000 (GMT) Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8FF90AC05E; Fri, 16 Nov 2018 20:09:16 +0000 (GMT) Received: from morokweng.localdomain.com (unknown [9.80.224.199]) by b01ledav006.gho.pok.ibm.com (Postfix) with ESMTP; Fri, 16 Nov 2018 20:09:16 +0000 (GMT) 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-doc@vger.kernel.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" , Jonathan Corbet , "AKASHI, Takahiro" , Thiago Jung Bauermann Subject: [PATCH v8 13/14] ima: Write modsig to the measurement list Date: Fri, 16 Nov 2018 18:07:11 -0200 X-Mailer: git-send-email 2.17.2 In-Reply-To: <20181116200712.14154-1-bauerman@linux.ibm.com> References: <20181116200712.14154-1-bauerman@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18111620-0052-0000-0000-000003576A27 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010063; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000270; SDB=6.01118417; UDB=6.00580177; IPR=6.00898525; MB=3.00024196; MTD=3.00000008; XFM=3.00000015; UTC=2018-11-16 20:09:26 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18111620-0053-0000-0000-00005EC974CF Message-Id: <20181116200712.14154-14-bauerman@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-11-16_11:,, 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 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1811160179 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Add modsig support to the "sig" template field, allowing the the contents of the modsig to be included in the measurement list. Suggested-by: Mimi Zohar Signed-off-by: Thiago Jung Bauermann --- security/integrity/ima/ima.h | 7 +++++++ security/integrity/ima/ima_modsig.c | 13 +++++++++++++ security/integrity/ima/ima_template_lib.c | 15 ++++++++++++++- 3 files changed, 34 insertions(+), 1 deletion(-) diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index 7f88e4b86156..8e1b1ddbe14f 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -315,6 +315,7 @@ int ima_read_modsig(enum ima_hooks func, const void *buf, loff_t buf_len, int *xattr_len); int ima_get_modsig_hash(struct evm_ima_xattr_data *hdr, enum hash_algo *algo, const u8 **hash, u8 *len); +int ima_modsig_serialize_data(struct evm_ima_xattr_data **data, int *data_len); int ima_modsig_verify(const unsigned int keyring_id, struct evm_ima_xattr_data *hdr); void ima_free_xattr_data(struct evm_ima_xattr_data *hdr); @@ -339,6 +340,12 @@ static inline int ima_get_modsig_hash(struct evm_ima_xattr_data *hdr, return -EOPNOTSUPP; } +static inline int ima_modsig_serialize_data(struct evm_ima_xattr_data **data, + int *data_len) +{ + return -EOPNOTSUPP; +} + static inline int ima_modsig_verify(const unsigned int keyring_id, struct evm_ima_xattr_data *hdr) { diff --git a/security/integrity/ima/ima_modsig.c b/security/integrity/ima/ima_modsig.c index 584d9d77b2c4..e31ab7dc11db 100644 --- a/security/integrity/ima/ima_modsig.c +++ b/security/integrity/ima/ima_modsig.c @@ -167,6 +167,19 @@ int ima_get_modsig_hash(struct evm_ima_xattr_data *hdr, enum hash_algo *algo, return pkcs7_get_digest(modsig->pkcs7_msg, hash, len); } +int ima_modsig_serialize_data(struct evm_ima_xattr_data **data, int *data_len) +{ + struct modsig_hdr *modsig = (struct modsig_hdr *) *data; + + if (!*data || (*data)->type != IMA_MODSIG) + return -EINVAL; + + *data = &modsig->raw_pkcs7; + *data_len = modsig->raw_pkcs7_len; + + return 0; +} + int ima_modsig_verify(const unsigned int keyring_id, struct evm_ima_xattr_data *hdr) { diff --git a/security/integrity/ima/ima_template_lib.c b/security/integrity/ima/ima_template_lib.c index 36d175816894..417cd153ba60 100644 --- a/security/integrity/ima/ima_template_lib.c +++ b/security/integrity/ima/ima_template_lib.c @@ -411,10 +411,23 @@ int ima_eventsig_init(struct ima_event_data *event_data, struct ima_field_data *field_data) { struct evm_ima_xattr_data *xattr_value = event_data->xattr_value; + int xattr_len = event_data->xattr_len; if (!is_signed(xattr_value)) return 0; - return ima_write_template_field_data(xattr_value, event_data->xattr_len, + /* + * The xattr_value for IMA_MODSIG is a runtime structure containing + * pointers. Get its raw data instead. + */ + if (xattr_value->type == IMA_MODSIG) { + int rc; + + rc = ima_modsig_serialize_data(&xattr_value, &xattr_len); + if (rc) + return rc; + } + + return ima_write_template_field_data(xattr_value, xattr_len, DATA_FMT_HEX, field_data); }