From patchwork Thu Sep 28 17:32:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Lukas Wunner X-Patchwork-Id: 13403372 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1E561CE7AFC for ; Thu, 28 Sep 2023 17:43:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231446AbjI1Rnv (ORCPT ); Thu, 28 Sep 2023 13:43:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35548 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229478AbjI1Rnu (ORCPT ); Thu, 28 Sep 2023 13:43:50 -0400 Received: from mailout3.hostsharing.net (mailout3.hostsharing.net [IPv6:2a01:4f8:150:2161:1:b009:f236:0]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BEA0E199; Thu, 28 Sep 2023 10:43:48 -0700 (PDT) Received: from h08.hostsharing.net (h08.hostsharing.net [IPv6:2a01:37:1000::53df:5f1c:0]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "*.hostsharing.net", Issuer "RapidSSL Global TLS RSA4096 SHA256 2022 CA1" (verified OK)) by mailout3.hostsharing.net (Postfix) with ESMTPS id 8DD0110029AE0; Thu, 28 Sep 2023 19:43:46 +0200 (CEST) Received: from localhost (unknown [89.246.108.87]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by h08.hostsharing.net (Postfix) with ESMTPSA id 4305960E0037; Thu, 28 Sep 2023 19:43:46 +0200 (CEST) X-Mailbox-Line: From 704291cbc90ca3aaaaa56b191017c1400963cf12 Mon Sep 17 00:00:00 2001 Message-Id: <704291cbc90ca3aaaaa56b191017c1400963cf12.1695921657.git.lukas@wunner.de> In-Reply-To: References: From: Lukas Wunner Date: Thu, 28 Sep 2023 19:32:32 +0200 Subject: [PATCH 02/12] X.509: Parse Subject Alternative Name in certificates To: Bjorn Helgaas , David Howells , David Woodhouse , Herbert Xu , "David S. Miller" , Alex Williamson , , , , , , Cc: Jonathan Cameron , , David Box , Dan Williams , Dave Jiang , "Li, Ming" , Zhi Wang , Alistair Francis , Wilfred Mallawa , Alexey Kardashevskiy , Tom Lendacky , Sean Christopherson , Alexander Graf Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org The upcoming support for PCI device authentication with CMA-SPDM (PCIe r6.1 sec 6.31) requires validating the Subject Alternative Name in X.509 certificates. Store a pointer to the Subject Alternative Name upon parsing for consumption by CMA-SPDM. Signed-off-by: Lukas Wunner Reviewed-by: Ilpo Järvinen Reviewed-by: Jonathan Cameron Reviewed-by: Wilfred Mallawa Acked-by: Dan Williams --- crypto/asymmetric_keys/x509_cert_parser.c | 15 +++++++++++++++ include/keys/x509-parser.h | 2 ++ 2 files changed, 17 insertions(+) diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c index 0a7049b470c1..18dfd564740b 100644 --- a/crypto/asymmetric_keys/x509_cert_parser.c +++ b/crypto/asymmetric_keys/x509_cert_parser.c @@ -579,6 +579,21 @@ int x509_process_extension(void *context, size_t hdrlen, return 0; } + if (ctx->last_oid == OID_subjectAltName) { + /* + * A certificate MUST NOT include more than one instance + * of a particular extension (RFC 5280 sec 4.2). + */ + if (ctx->cert->raw_san) { + pr_err("Duplicate Subject Alternative Name\n"); + return -EINVAL; + } + + ctx->cert->raw_san = v; + ctx->cert->raw_san_size = vlen; + return 0; + } + if (ctx->last_oid == OID_keyUsage) { /* * Get hold of the keyUsage bit string diff --git a/include/keys/x509-parser.h b/include/keys/x509-parser.h index 7c2ebc84791f..9c6e7cdf4870 100644 --- a/include/keys/x509-parser.h +++ b/include/keys/x509-parser.h @@ -32,6 +32,8 @@ struct x509_certificate { unsigned raw_subject_size; unsigned raw_skid_size; const void *raw_skid; /* Raw subjectKeyId in ASN.1 */ + const void *raw_san; /* Raw subjectAltName in ASN.1 */ + unsigned raw_san_size; unsigned index; bool seen; /* Infinite recursion prevention */ bool verified;