From patchwork Thu Jul 30 00:31:03 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Deven Bowers X-Patchwork-Id: 11691983 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 40677722 for ; Thu, 30 Jul 2020 00:31:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 253142083E for ; Thu, 30 Jul 2020 00:31:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="Nol/SQau" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728265AbgG3AbU (ORCPT ); Wed, 29 Jul 2020 20:31:20 -0400 Received: from linux.microsoft.com ([13.77.154.182]:54004 "EHLO linux.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728112AbgG3AbU (ORCPT ); Wed, 29 Jul 2020 20:31:20 -0400 Received: from dede-linux-virt.corp.microsoft.com (unknown [131.107.160.54]) by linux.microsoft.com (Postfix) with ESMTPSA id 16B2620B4909; Wed, 29 Jul 2020 17:31:19 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 16B2620B4909 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1596069079; bh=5r88m8tcUXiyScfgzQMHwRZLIt4HBAVPLHZslW/JgqI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Nol/SQau/JZewjOq0QYKhM2OWR0FRCM0HNPrFmz+PMJxdki3NU2PD7nf6S0186HCZ oj42P3Olt2RgBzsqUKUyO6NlxmZiFz8pnCgbp9AX4hZsTEyHiEjqGRExWTcRT7nzMj cQxllHvIJQK2VtHsflC25rz6G9m/t2SQJrp8ped4= From: Deven Bowers To: agk@redhat.com, axboe@kernel.dk, snitzer@redhat.com, jmorris@namei.org, serge@hallyn.com, zohar@linux.ibm.com, viro@zeniv.linux.org.uk, paul@paul-moore.com, eparis@redhat.com, jannh@google.com, dm-devel@redhat.com, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-audit@redhat.com Cc: tyhicks@linux.microsoft.com, linux-kernel@vger.kernel.org, corbet@lwn.net, sashal@kernel.org, jaskarankhurana@linux.microsoft.com, mdsakib@microsoft.com, nramas@linux.microsoft.com, pasha.tatashin@soleen.com Subject: [RFC PATCH v6 01/11] scripts: add ipe tooling to generate boot policy Date: Wed, 29 Jul 2020 17:31:03 -0700 Message-Id: <20200730003113.2561644-2-deven.desai@linux.microsoft.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200730003113.2561644-1-deven.desai@linux.microsoft.com> References: <20200730003113.2561644-1-deven.desai@linux.microsoft.com> MIME-Version: 1.0 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: Add a tool for the generation of an IPE policy to be compiled into the kernel. This policy will be enforced until userland deploys and activates a new policy. Signed-off-by: Deven Bowers --- MAINTAINERS | 6 ++ scripts/Makefile | 1 + scripts/ipe/Makefile | 2 + scripts/ipe/polgen/.gitignore | 1 + scripts/ipe/polgen/Makefile | 7 ++ scripts/ipe/polgen/polgen.c | 136 ++++++++++++++++++++++++++++++++++ 6 files changed, 153 insertions(+) create mode 100644 scripts/ipe/Makefile create mode 100644 scripts/ipe/polgen/.gitignore create mode 100644 scripts/ipe/polgen/Makefile create mode 100644 scripts/ipe/polgen/polgen.c diff --git a/MAINTAINERS b/MAINTAINERS index f0569cf304ca..d29c2e4612e4 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -8580,6 +8580,12 @@ S: Supported T: git git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git F: security/integrity/ima/ +INTEGRITY POLICY ENFORCEMENT (IPE) +M: Deven Bowers +L: linux-integrity@vger.kernel.org +S: Supported +F: scripts/ipe/ + INTEL 810/815 FRAMEBUFFER DRIVER M: Antonino Daplas L: linux-fbdev@vger.kernel.org diff --git a/scripts/Makefile b/scripts/Makefile index 95ecf970c74c..b3c1882fd6dd 100644 --- a/scripts/Makefile +++ b/scripts/Makefile @@ -34,6 +34,7 @@ hostprogs += unifdef subdir-$(CONFIG_GCC_PLUGINS) += gcc-plugins subdir-$(CONFIG_MODVERSIONS) += genksyms subdir-$(CONFIG_SECURITY_SELINUX) += selinux +subdir-$(CONFIG_SECURITY_IPE) += ipe # Let clean descend into subdirs subdir- += basic dtc gdb kconfig mod diff --git a/scripts/ipe/Makefile b/scripts/ipe/Makefile new file mode 100644 index 000000000000..e87553fbb8d6 --- /dev/null +++ b/scripts/ipe/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +subdir-y := polgen diff --git a/scripts/ipe/polgen/.gitignore b/scripts/ipe/polgen/.gitignore new file mode 100644 index 000000000000..80f32f25d200 --- /dev/null +++ b/scripts/ipe/polgen/.gitignore @@ -0,0 +1 @@ +polgen diff --git a/scripts/ipe/polgen/Makefile b/scripts/ipe/polgen/Makefile new file mode 100644 index 000000000000..a519b594e13c --- /dev/null +++ b/scripts/ipe/polgen/Makefile @@ -0,0 +1,7 @@ +# SPDX-License-Identifier: GPL-2.0 +hostprogs-y := polgen +HOST_EXTRACFLAGS += \ + -I$(srctree)/include \ + -I$(srctree)/include/uapi \ + +always := $(hostprogs-y) diff --git a/scripts/ipe/polgen/polgen.c b/scripts/ipe/polgen/polgen.c new file mode 100644 index 000000000000..a80fffe1b27c --- /dev/null +++ b/scripts/ipe/polgen/polgen.c @@ -0,0 +1,136 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) Microsoft Corporation. All rights reserved. + */ + +#include +#include +#include +#include +#include + +static void usage(const char *const name) +{ + printf("Usage: %s OutputFile (PolicyFile)\n", name); + exit(EINVAL); +} + +static int policy_to_buffer(const char *pathname, char **buffer, size_t *size) +{ + int rc = 0; + FILE *fd; + char *lbuf; + size_t fsize; + size_t read; + + fd = fopen(pathname, "r"); + if (!fd) { + rc = errno; + goto out; + } + + fseek(fd, 0, SEEK_END); + fsize = ftell(fd); + rewind(fd); + + lbuf = malloc(fsize); + if (!lbuf) { + rc = ENOMEM; + goto out_close; + } + + read = fread((void *)lbuf, sizeof(*lbuf), fsize, fd); + if (read != fsize) { + rc = -1; + goto out_free; + } + + *buffer = lbuf; + *size = fsize; + fclose(fd); + + return rc; + +out_free: + free(lbuf); +out_close: + fclose(fd); +out: + return rc; +} + +static int write_boot_policy(const char *pathname, const char *buf, size_t size) +{ + FILE *fd; + size_t i; + + fd = fopen(pathname, "w"); + if (!fd) + goto err; + + fprintf(fd, "/* This file is automatically generated."); + fprintf(fd, " Do not edit. */\n"); + fprintf(fd, "#include \n"); + fprintf(fd, "const char *const ipe_boot_policy =\n"); + + if (!buf || size == 0) { + fprintf(fd, "\tNULL;\n"); + fclose(fd); + return 0; + } + + for (i = 0; i < size; ++i) { + if (i == 0) + fprintf(fd, "\t\""); + + switch (buf[i]) { + case '"': + fprintf(fd, "\\\""); + break; + case '\'': + fprintf(fd, "'"); + break; + case '\n': + fprintf(fd, "\\n\"\n\t\""); + break; + case '\\': + fprintf(fd, "\\\\"); + break; + default: + fprintf(fd, "%c", buf[i]); + } + } + fprintf(fd, "\";\n"); + fclose(fd); + + return 0; + +err: + if (fd) + fclose(fd); + return errno; +} + +int main(int argc, const char *argv[]) +{ + int rc = 0; + size_t len = 0; + char *policy = NULL; + + if (argc < 2) + usage(argv[0]); + + if (argc > 2) { + rc = policy_to_buffer(argv[2], &policy, &len); + if (rc != 0) + goto cleanup; + } + + rc = write_boot_policy(argv[1], policy, len); +cleanup: + if (policy) + free(policy); + if (rc != 0) + perror("An error occurred during policy conversion: "); + return rc; +}