From patchwork Sun Dec 11 05:35:33 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nayna X-Patchwork-Id: 9469583 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id AA21B60231 for ; Sun, 11 Dec 2016 05:36:20 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9A8C928305 for ; Sun, 11 Dec 2016 05:36:20 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8FA03283ED; Sun, 11 Dec 2016 05:36:20 +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=-6.4 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RCVD_IN_SORBS_SPAM 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 C3EEB28307 for ; Sun, 11 Dec 2016 05:36:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752864AbcLKFf5 (ORCPT ); Sun, 11 Dec 2016 00:35:57 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:40942 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752437AbcLKFfy (ORCPT ); Sun, 11 Dec 2016 00:35:54 -0500 Received: from pps.filterd (m0098417.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id uBB5YjmM132619 for ; Sun, 11 Dec 2016 00:35:54 -0500 Received: from e23smtp01.au.ibm.com (e23smtp01.au.ibm.com [202.81.31.143]) by mx0a-001b2d01.pphosted.com with ESMTP id 2790bf0nmc-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Sun, 11 Dec 2016 00:35:54 -0500 Received: from localhost by e23smtp01.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Sun, 11 Dec 2016 15:35:48 +1000 Received: from d23relay10.au.ibm.com (d23relay10.au.ibm.com [9.190.26.77]) by d23dlp01.au.ibm.com (Postfix) with ESMTP id 2EBE62CE8056; Sun, 11 Dec 2016 16:35:48 +1100 (EST) Received: from d23av02.au.ibm.com (d23av02.au.ibm.com [9.190.235.138]) by d23relay10.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id uBB5ZmBf65273990; Sun, 11 Dec 2016 16:35:48 +1100 Received: from d23av02.au.ibm.com (localhost [127.0.0.1]) by d23av02.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id uBB5Zl3R008889; Sun, 11 Dec 2016 16:35:48 +1100 Received: from c365f16u1b3.pok.stglabs.ibm.com (c365f16u1b3.pok.stglabs.ibm.com [9.47.77.42]) by d23av02.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id uBB5ZaJr008790; Sun, 11 Dec 2016 16:35:45 +1100 From: Nayna Jain To: tpmdd-devel@lists.sourceforge.net Cc: peterhuewe@gmx.de, tpmdd@selhorst.net, jarkko.sakkinen@linux.intel.com, jgunthorpe@obsidianresearch.com, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, Nayna Jain Subject: [PATCH v7 2/2] tpm: add securityfs support for TPM 2.0 firmware event log Date: Sun, 11 Dec 2016 00:35:33 -0500 X-Mailer: git-send-email 2.5.0 In-Reply-To: <1481434533-3453-1-git-send-email-nayna@linux.vnet.ibm.com> References: <1481434533-3453-1-git-send-email-nayna@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16121105-1617-0000-0000-0000018C36F6 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16121105-1618-0000-0000-000047552E8F Message-Id: <1481434533-3453-3-git-send-email-nayna@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2016-12-11_03:, , 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=8.0.1-1609300000 definitions=main-1612110068 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Unlike the device driver support for TPM 1.2, the TPM 2.0 does not support the securityfs pseudo files for displaying the firmware event log. This patch enables support for providing the TPM 2.0 event log in binary form. TPM 2.0 event log supports a crypto agile format that records multiple digests, which is different from TPM 1.2. This patch enables the tpm_bios_log_setup for TPM 2.0 and adds the event log parser which understand the TPM 2.0 crypto agile format. Signed-off-by: Nayna Jain --- drivers/char/tpm/Makefile | 2 +- .../char/tpm/{tpm_eventlog.c => tpm1_eventlog.c} | 35 ++-- drivers/char/tpm/tpm2_eventlog.c | 203 +++++++++++++++++++++ drivers/char/tpm/tpm_eventlog.h | 70 +++++++ 4 files changed, 295 insertions(+), 15 deletions(-) rename drivers/char/tpm/{tpm_eventlog.c => tpm1_eventlog.c} (95%) create mode 100644 drivers/char/tpm/tpm2_eventlog.c diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile index a05b1eb..3d386a8 100644 --- a/drivers/char/tpm/Makefile +++ b/drivers/char/tpm/Makefile @@ -3,7 +3,7 @@ # obj-$(CONFIG_TCG_TPM) += tpm.o tpm-y := tpm-interface.o tpm-dev.o tpm-sysfs.o tpm-chip.o tpm2-cmd.o \ - tpm_eventlog.o + tpm1_eventlog.o tpm2_eventlog.o tpm-$(CONFIG_ACPI) += tpm_ppi.o tpm_acpi.o tpm-$(CONFIG_OF) += tpm_of.o obj-$(CONFIG_TCG_TIS_CORE) += tpm_tis_core.o diff --git a/drivers/char/tpm/tpm_eventlog.c b/drivers/char/tpm/tpm1_eventlog.c similarity index 95% rename from drivers/char/tpm/tpm_eventlog.c rename to drivers/char/tpm/tpm1_eventlog.c index 11bb113..9a8605e 100644 --- a/drivers/char/tpm/tpm_eventlog.c +++ b/drivers/char/tpm/tpm1_eventlog.c @@ -390,9 +390,6 @@ int tpm_bios_log_setup(struct tpm_chip *chip) unsigned int cnt; int rc = 0; - if (chip->flags & TPM_CHIP_FLAG_TPM2) - return 0; - rc = tpm_read_log(chip); if (rc) return rc; @@ -407,7 +404,13 @@ int tpm_bios_log_setup(struct tpm_chip *chip) cnt++; chip->bin_log_seqops.chip = chip; - chip->bin_log_seqops.seqops = &tpm_binary_b_measurements_seqops; + if (chip->flags & TPM_CHIP_FLAG_TPM2) + chip->bin_log_seqops.seqops = + &tpm2_binary_b_measurements_seqops; + else + chip->bin_log_seqops.seqops = + &tpm_binary_b_measurements_seqops; + chip->bios_dir[cnt] = securityfs_create_file("binary_bios_measurements", @@ -418,17 +421,21 @@ int tpm_bios_log_setup(struct tpm_chip *chip) goto err; cnt++; - chip->ascii_log_seqops.chip = chip; - chip->ascii_log_seqops.seqops = &tpm_ascii_b_measurements_seqops; + if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) { - chip->bios_dir[cnt] = - securityfs_create_file("ascii_bios_measurements", - 0440, chip->bios_dir[0], - (void *)&chip->ascii_log_seqops, - &tpm_bios_measurements_ops); - if (IS_ERR(chip->bios_dir[cnt])) - goto err; - cnt++; + chip->ascii_log_seqops.chip = chip; + chip->ascii_log_seqops.seqops = + &tpm_ascii_b_measurements_seqops; + + chip->bios_dir[cnt] = + securityfs_create_file("ascii_bios_measurements", + 0440, chip->bios_dir[0], + (void *)&chip->ascii_log_seqops, + &tpm_bios_measurements_ops); + if (IS_ERR(chip->bios_dir[cnt])) + goto err; + cnt++; + } return 0; diff --git a/drivers/char/tpm/tpm2_eventlog.c b/drivers/char/tpm/tpm2_eventlog.c new file mode 100644 index 0000000..63690d3 --- /dev/null +++ b/drivers/char/tpm/tpm2_eventlog.c @@ -0,0 +1,203 @@ +/* + * Copyright (C) 2016 IBM Corporation + * + * Authors: + * Nayna Jain + * + * Access to TPM 2.0 event log as written by Firmware. + * It assumes that writer of event log has followed TCG Specification + * for Family "2.0" and written the event data in little endian. + * With that, it doesn't need any endian conversion for structure + * content. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include +#include +#include +#include +#include + +#include "tpm.h" +#include "tpm_eventlog.h" + +static int calc_tpm2_event_size(struct tcg_pcr_event2 *event, + struct tcg_pcr_event *event_header) +{ + struct tcg_efi_specid_event *efispecid; + struct tcg_event_field *event_field; + void *marker; + void *marker_start; + int i; + int j; + u16 halg; + u32 halg_size; + size_t size; + + /* + * TPM 2.0 supports extend to multiple PCR Banks. This implies + * event log also has multiple digest values, one for each PCR Bank. + * This is called Crypto Agile Log Entry Format. + * Below code implements the procedure defined in TCG EFI Protocol + * Specification Family "2.0" to parse the event log in Crypto Agile + * Log Entry Format. + */ + + marker = event; + marker_start = marker; + marker = marker + sizeof(event->pcr_idx) + sizeof(event->event_type) + + sizeof(event->digests.count); + + efispecid = (struct tcg_efi_specid_event *) event_header->event; + + for (i = 0; (i < event->digests.count) && (i < TPM2_ACTIVE_PCR_BANKS); + i++) { + halg_size = sizeof(event->digests.digests[i].alg_id); + memcpy(&halg, marker, halg_size); + marker = marker + halg_size; + for (j = 0; (j < efispecid->num_algs); j++) { + if (halg == efispecid->digest_sizes[j].alg_id) { + marker = marker + + efispecid->digest_sizes[j].digest_size; + break; + } + } + } + + event_field = (struct tcg_event_field *) marker; + marker = marker + sizeof(event_field->event_size) + + event_field->event_size; + size = marker - marker_start; + + if ((event->event_type == 0) && (event_field->event_size == 0)) + return 0; + + return size; +} + +static void *tpm2_bios_measurements_start(struct seq_file *m, loff_t *pos) +{ + struct tpm_chip *chip = m->private; + struct tpm_bios_log *log = &chip->log; + void *addr = log->bios_event_log; + void *limit = log->bios_event_log_end; + struct tcg_pcr_event *event_header; + struct tcg_pcr_event2 *event; + int i; + size_t size; + + event_header = addr; + size = sizeof(struct tcg_pcr_event) - sizeof(event_header->event) + + event_header->event_size; + + if (*pos == 0) { + if (addr + size < limit) { + if ((event_header->event_type == 0) && + (event_header->event_size == 0)) + return NULL; + return SEQ_START_TOKEN; + } + } + + if (*pos > 0) { + addr += size; + event = addr; + size = calc_tpm2_event_size(event, event_header); + if ((addr + size >= limit) || (size == 0)) + return NULL; + } + + for (i = 0; i < (*pos - 1); i++) { + event = addr; + size = calc_tpm2_event_size(event, event_header); + + if ((addr + size >= limit) || (size == 0)) + return NULL; + addr += size; + } + + return addr; +} + +static void *tpm2_bios_measurements_next(struct seq_file *m, void *v, + loff_t *pos) +{ + struct tcg_pcr_event *event_header; + struct tcg_pcr_event2 *event; + struct tpm_chip *chip = m->private; + struct tpm_bios_log *log = &chip->log; + void *limit = log->bios_event_log_end; + void *marker; + size_t event_size; + + event_header = log->bios_event_log; + + if (v == SEQ_START_TOKEN) { + event_size = sizeof(struct tcg_pcr_event) + - sizeof(event_header->event) + + event_header->event_size; + marker = event_header; + } else { + event = v; + event_size = calc_tpm2_event_size(event, event_header); + if (event_size == 0) + return NULL; + marker = event; + } + + marker = marker + event_size; + if (marker >= limit) + return NULL; + v = marker; + event = v; + + event_size = calc_tpm2_event_size(event, event_header); + if (((v + event_size) >= limit) || (event_size == 0)) + return NULL; + + (*pos)++; + return v; +} + +static void tpm2_bios_measurements_stop(struct seq_file *m, void *v) +{ +} + +static int tpm2_binary_bios_measurements_show(struct seq_file *m, void *v) +{ + struct tpm_chip *chip = m->private; + struct tpm_bios_log *log = &chip->log; + struct tcg_pcr_event *event_header = log->bios_event_log; + struct tcg_pcr_event2 *event = v; + void *temp_ptr; + size_t size; + + if (v == SEQ_START_TOKEN) { + size = sizeof(struct tcg_pcr_event) + - sizeof(event_header->event) + + event_header->event_size; + + temp_ptr = event_header; + + if (size > 0) + seq_write(m, temp_ptr, size); + } else { + size = calc_tpm2_event_size(event, event_header); + temp_ptr = event; + if (size > 0) + seq_write(m, temp_ptr, size); + } + + return 0; +} + +const struct seq_operations tpm2_binary_b_measurements_seqops = { + .start = tpm2_bios_measurements_start, + .next = tpm2_bios_measurements_next, + .stop = tpm2_bios_measurements_stop, + .show = tpm2_binary_bios_measurements_show, +}; diff --git a/drivers/char/tpm/tpm_eventlog.h b/drivers/char/tpm/tpm_eventlog.h index 1660d74..6886a11 100644 --- a/drivers/char/tpm/tpm_eventlog.h +++ b/drivers/char/tpm/tpm_eventlog.h @@ -2,9 +2,12 @@ #ifndef __TPM_EVENTLOG_H__ #define __TPM_EVENTLOG_H__ +#include + #define TCG_EVENT_NAME_LEN_MAX 255 #define MAX_TEXT_EVENT 1000 /* Max event string length */ #define ACPI_TCPA_SIG "TCPA" /* 0x41504354 /'TCPA' */ +#define TPM2_ACTIVE_PCR_BANKS 3 #ifdef CONFIG_PPC64 #define do_endian_conversion(x) be32_to_cpu(x) @@ -73,6 +76,73 @@ enum tcpa_pc_event_ids { HOST_TABLE_OF_DEVICES, }; +/* + * All the structures related to TPM 2.0 Event Log are taken from TCG EFI + * Protocol Specification, Family "2.0". Document is available on link + * http://www.trustedcomputinggroup.org/tcg-efi-protocol-specification/ . + * Information is also available on TCG PC Client Platform Firmware Profile + * Specification, Family "2.0". + * Detailed digest structures for TPM 2.0 are defined in document + * Trusted Platform Module Library Part 2: Structures, Family "2.0". + */ + +/* TPM 2.0 Event log header algorithm spec. */ +struct tcg_efi_specid_event_algs { + u16 alg_id; + u16 digest_size; +} __packed; + +/* TPM 2.0 Event log header data. */ +struct tcg_efi_specid_event { + u8 signature[16]; + u32 platform_class; + u8 spec_version_minor; + u8 spec_version_major; + u8 spec_errata; + u8 uintnsize; + u32 num_algs; + struct tcg_efi_specid_event_algs digest_sizes[TPM2_ACTIVE_PCR_BANKS]; + u8 vendor_info_size; + u8 vendor_info[0]; +} __packed; + +/* TPM 2.0 Event Log Header. */ +struct tcg_pcr_event { + u32 pcr_idx; + u32 event_type; + u8 digest[20]; + u32 event_size; + u8 event[0]; +} __packed; + +/* TPM 2.0 Crypto agile algorithm and respective digest. */ +struct tpmt_ha { + u16 alg_id; + u8 digest[SHA384_DIGEST_SIZE]; +} __packed; + +/* TPM 2.0 Crypto agile digests list. */ +struct tpml_digest_values { + u32 count; + struct tpmt_ha digests[TPM2_ACTIVE_PCR_BANKS]; +} __packed; + +/* TPM 2.0 Event field structure. */ +struct tcg_event_field { + u32 event_size; + u8 event[0]; +} __packed; + +/* TPM 2.0 Crypto agile log entry format. */ +struct tcg_pcr_event2 { + u32 pcr_idx; + u32 event_type; + struct tpml_digest_values digests; + struct tcg_event_field event; +} __packed; + +extern const struct seq_operations tpm2_binary_b_measurements_seqops; + #if defined(CONFIG_ACPI) int tpm_read_log_acpi(struct tpm_chip *chip); #else