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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 0F0FEC11F66 for ; Thu, 1 Jul 2021 01:13:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E85E6613FC for ; Thu, 1 Jul 2021 01:13:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238311AbhGABQG (ORCPT ); Wed, 30 Jun 2021 21:16:06 -0400 Received: from vmicros1.altlinux.org ([194.107.17.57]:48174 "EHLO vmicros1.altlinux.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238272AbhGABQG (ORCPT ); Wed, 30 Jun 2021 21:16:06 -0400 Received: from imap.altlinux.org (imap.altlinux.org [194.107.17.38]) by vmicros1.altlinux.org (Postfix) with ESMTP id C85B372C8B4; Thu, 1 Jul 2021 04:13:35 +0300 (MSK) Received: from beacon.altlinux.org (unknown [193.43.10.250]) by imap.altlinux.org (Postfix) with ESMTPSA id A307A4A46ED; Thu, 1 Jul 2021 04:13:35 +0300 (MSK) From: Vitaly Chikunov To: Mimi Zohar , Dmitry Kasatkin , linux-integrity@vger.kernel.org Cc: Elvira Khabirova , Stefan Berger Subject: [PATCH v7 1/3] ima-evm-utils: Allow manual setting keyid for signing Date: Thu, 1 Jul 2021 04:13:21 +0300 Message-Id: <20210701011323.2377251-2-vt@altlinux.org> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20210701011323.2377251-1-vt@altlinux.org> References: <20210701011323.2377251-1-vt@altlinux.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org Allow user to set signature's keyid using `--keyid' option. Keyid should correspond to SKID in certificate, when keyid is calculated using SHA-1 in libimaevm it may mismatch keyid extracted by the kernel from SKID of certificate (the way public key is presented to the kernel), thus making signatures not verifiable. This may happen when certificate is using non SHA-1 SKID (see rfc7093) or just 'unique number' (see rfc5280 4.2.1.2). As a last resort user may specify arbitrary keyid using the new option. This commit creates ABI change for libimaevm, because of adding additional parameter to imaevm_params - newer libimaevm cannot work with older clients. Signed-off-by: Vitaly Chikunov Reported-by: Elvira Khabirova Reviewed-by: Stefan Berger --- README | 1 + src/evmctl.c | 20 ++++++++++++++++++++ src/imaevm.h | 1 + src/libimaevm.c | 8 +++++--- tests/sign_verify.test | 1 + 5 files changed, 28 insertions(+), 3 deletions(-) diff --git a/README b/README index 321045d..20fa009 100644 --- a/README +++ b/README @@ -48,6 +48,7 @@ OPTIONS --xattr-user store xattrs in user namespace (for testing purposes) --rsa use RSA key type and signing scheme v1 -k, --key path to signing key (default: /etc/keys/{privkey,pubkey}_evm.pem) + --keyid n overwrite signature keyid with a 32-bit value in hex (for signing) -o, --portable generate portable EVM signatures -p, --pass password for encrypted signing key -r, --recursive recurse into directories (sign) diff --git a/src/evmctl.c b/src/evmctl.c index 7a6f202..f272250 100644 --- a/src/evmctl.c +++ b/src/evmctl.c @@ -2514,6 +2514,7 @@ static void usage(void) " --xattr-user store xattrs in user namespace (for testing purposes)\n" " --rsa use RSA key type and signing scheme v1\n" " -k, --key path to signing key (default: /etc/keys/{privkey,pubkey}_evm.pem)\n" + " --keyid n overwrite signature keyid with a 32-bit value in hex (for signing)\n" " -o, --portable generate portable EVM signatures\n" " -p, --pass password for encrypted signing key\n" " -r, --recursive recurse into directories (sign)\n" @@ -2594,6 +2595,7 @@ static struct option opts[] = { {"ignore-violations", 0, 0, 141}, {"pcrs", 1, 0, 142}, {"verify-bank", 2, 0, 143}, + {"keyid", 1, 0, 144}, {} }; @@ -2638,6 +2640,8 @@ int main(int argc, char *argv[]) { int err = 0, c, lind; ENGINE *eng = NULL; + unsigned long keyid; + char *eptr; #if !(OPENSSL_VERSION_NUMBER < 0x10100000) OPENSSL_init_crypto( @@ -2785,6 +2789,22 @@ int main(int argc, char *argv[]) case 143: verify_bank = optarg; break; + case 144: + errno = 0; + keyid = strtoul(optarg, &eptr, 16); + /* + * ULONG_MAX is error from strtoul(3), + * UINT_MAX is `imaevm_params.keyid' maximum value, + * 0 is reserved for keyid being unset. + */ + if (errno || eptr - optarg != strlen(optarg) || + keyid == ULONG_MAX || keyid > UINT_MAX || + keyid == 0) { + log_err("Invalid keyid value.\n"); + exit(1); + } + imaevm_params.keyid = keyid; + break; case '?': exit(1); break; diff --git a/src/imaevm.h b/src/imaevm.h index 4503919..fe244f1 100644 --- a/src/imaevm.h +++ b/src/imaevm.h @@ -196,6 +196,7 @@ struct libimaevm_params { const char *hash_algo; const char *keyfile; const char *keypass; + uint32_t keyid; /* keyid overriding value, unless 0. (Host order.) */ }; struct RSA_ASN1_template { diff --git a/src/libimaevm.c b/src/libimaevm.c index 2856270..e8e0d0e 100644 --- a/src/libimaevm.c +++ b/src/libimaevm.c @@ -45,6 +45,7 @@ #include #include #include +#include #include #include #include @@ -891,7 +892,6 @@ static int sign_hash_v2(const char *algo, const unsigned char *hash, const EVP_MD *md; size_t sigsize; const char *st; - uint32_t keyid; if (!hash) { log_err("sign_hash_v2: hash is null\n"); @@ -929,8 +929,10 @@ static int sign_hash_v2(const char *algo, const unsigned char *hash, return -1; } - calc_keyid_v2(&keyid, name, pkey); - hdr->keyid = keyid; + if (imaevm_params.keyid) + hdr->keyid = htonl(imaevm_params.keyid); + else + calc_keyid_v2(&hdr->keyid, name, pkey); st = "EVP_PKEY_CTX_new"; if (!(ctx = EVP_PKEY_CTX_new(pkey, NULL))) diff --git a/tests/sign_verify.test b/tests/sign_verify.test index 3d7aa51..eccf5fa 100755 --- a/tests/sign_verify.test +++ b/tests/sign_verify.test @@ -365,6 +365,7 @@ sign_verify rsa1024 sha256 0x0301 --rsa sign_verify rsa1024 md5 0x030201:K:0080 sign_verify rsa1024 sha1 0x030202:K:0080 sign_verify rsa1024 sha224 0x030207:K:0080 +expect_pass check_sign TYPE=ima KEY=rsa1024 ALG=sha256 PREFIX=0x030204aabbccdd0080 OPTS=--keyid=aabbccdd sign_verify rsa1024 sha256 0x030204:K:0080 try_different_keys try_different_sigs -- 2.11.0