Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752896AbdGFWSz (ORCPT ); Thu, 6 Jul 2017 18:18:55 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:44408 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752856AbdGFWSv (ORCPT ); Thu, 6 Jul 2017 18:18:51 -0400 From: Thiago Jung Bauermann To: linux-security-module@vger.kernel.org Cc: linux-ima-devel@lists.sourceforge.net, 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 , Rusty Russell , Herbert Xu , "David S. Miller" , "AKASHI, Takahiro" , Thiago Jung Bauermann Subject: [PATCH v3 4/7] integrity: Introduce integrity_keyring_from_id Date: Thu, 6 Jul 2017 19:17:50 -0300 X-Mailer: git-send-email 2.13.0 In-Reply-To: <20170706221753.17380-1-bauerman@linux.vnet.ibm.com> References: <20170706221753.17380-1-bauerman@linux.vnet.ibm.com> X-TM-AS-MML: disable x-cbid: 17070622-1523-0000-0000-000002B2B5BB X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17070622-1524-0000-0000-00002A4BC596 Message-Id: <20170706221753.17380-5-bauerman@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-07-06_14:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=1 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1703280000 definitions=main-1707060380 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2546 Lines: 77 IMA will need to obtain the keyring used to verify file signatures so that it can verify the module-style signature appended to files. Signed-off-by: Thiago Jung Bauermann --- security/integrity/digsig.c | 28 +++++++++++++++++++--------- security/integrity/integrity.h | 1 + 2 files changed, 20 insertions(+), 9 deletions(-) diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c index 06554c448dce..bb5328ba2848 100644 --- a/security/integrity/digsig.c +++ b/security/integrity/digsig.c @@ -48,11 +48,10 @@ static bool init_keyring __initdata; #define restrict_link_to_ima restrict_link_by_builtin_trusted #endif -int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, - const char *digest, int digestlen) +struct key *integrity_keyring_from_id(const unsigned int id) { - if (id >= INTEGRITY_KEYRING_MAX || siglen < 2) - return -EINVAL; + if (id >= INTEGRITY_KEYRING_MAX) + return ERR_PTR(-EINVAL); if (!keyring[id]) { keyring[id] = @@ -61,18 +60,29 @@ int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, int err = PTR_ERR(keyring[id]); pr_err("no %s keyring: %d\n", keyring_name[id], err); keyring[id] = NULL; - return err; + return ERR_PTR(err); } } + return keyring[id]; +} + +int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, + const char *digest, int digestlen) +{ + struct key *keyring = integrity_keyring_from_id(id); + + if (IS_ERR(keyring) || siglen < 2) + return PTR_ERR(keyring); + switch (sig[1]) { case 1: /* v1 API expect signature without xattr type */ - return digsig_verify(keyring[id], sig + 1, siglen - 1, - digest, digestlen); + return digsig_verify(keyring, sig + 1, siglen - 1, digest, + digestlen); case 2: - return asymmetric_verify(keyring[id], sig, siglen, - digest, digestlen); + return asymmetric_verify(keyring, sig, siglen, digest, + digestlen); } return -EOPNOTSUPP; diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h index 874211aba6e9..ba5f13f94ed3 100644 --- a/security/integrity/integrity.h +++ b/security/integrity/integrity.h @@ -129,6 +129,7 @@ int __init integrity_read_file(const char *path, char **data); #ifdef CONFIG_INTEGRITY_SIGNATURE +struct key *integrity_keyring_from_id(const unsigned int id); int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, const char *digest, int digestlen); -- 2.13.0