mirror of https://gitee.com/openkylin/linux.git
557 lines
12 KiB
C
557 lines
12 KiB
C
/*
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* Copyright (C) 2005 IBM Corporation
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*
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* Authors:
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* Seiji Munetoh <munetoh@jp.ibm.com>
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* Stefan Berger <stefanb@us.ibm.com>
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* Reiner Sailer <sailer@watson.ibm.com>
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* Kylene Hall <kjhall@us.ibm.com>
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*
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* Maintained by: <tpmdd-devel@lists.sourceforge.net>
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*
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* Access to the eventlog extended by the TCG BIOS of PC platform
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/seq_file.h>
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#include <linux/fs.h>
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#include <linux/security.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <acpi/acpi.h>
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#include "tpm.h"
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#define TCG_EVENT_NAME_LEN_MAX 255
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#define MAX_TEXT_EVENT 1000 /* Max event string length */
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#define ACPI_TCPA_SIG "TCPA" /* 0x41504354 /'TCPA' */
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enum bios_platform_class {
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BIOS_CLIENT = 0x00,
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BIOS_SERVER = 0x01,
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};
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struct tpm_bios_log {
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void *bios_event_log;
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void *bios_event_log_end;
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};
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struct acpi_tcpa {
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struct acpi_table_header hdr;
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u16 platform_class;
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union {
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struct client_hdr {
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u32 log_max_len __attribute__ ((packed));
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u64 log_start_addr __attribute__ ((packed));
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} client;
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struct server_hdr {
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u16 reserved;
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u64 log_max_len __attribute__ ((packed));
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u64 log_start_addr __attribute__ ((packed));
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} server;
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};
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};
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struct tcpa_event {
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u32 pcr_index;
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u32 event_type;
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u8 pcr_value[20]; /* SHA1 */
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u32 event_size;
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u8 event_data[0];
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};
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enum tcpa_event_types {
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PREBOOT = 0,
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POST_CODE,
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UNUSED,
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NO_ACTION,
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SEPARATOR,
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ACTION,
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EVENT_TAG,
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SCRTM_CONTENTS,
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SCRTM_VERSION,
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CPU_MICROCODE,
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PLATFORM_CONFIG_FLAGS,
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TABLE_OF_DEVICES,
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COMPACT_HASH,
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IPL,
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IPL_PARTITION_DATA,
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NONHOST_CODE,
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NONHOST_CONFIG,
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NONHOST_INFO,
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};
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static const char* tcpa_event_type_strings[] = {
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"PREBOOT",
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"POST CODE",
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"",
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"NO ACTION",
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"SEPARATOR",
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"ACTION",
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"EVENT TAG",
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"S-CRTM Contents",
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"S-CRTM Version",
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"CPU Microcode",
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"Platform Config Flags",
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"Table of Devices",
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"Compact Hash",
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"IPL",
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"IPL Partition Data",
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"Non-Host Code",
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"Non-Host Config",
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"Non-Host Info"
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};
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struct tcpa_pc_event {
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u32 event_id;
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u32 event_size;
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u8 event_data[0];
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};
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enum tcpa_pc_event_ids {
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SMBIOS = 1,
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BIS_CERT,
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POST_BIOS_ROM,
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ESCD,
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CMOS,
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NVRAM,
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OPTION_ROM_EXEC,
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OPTION_ROM_CONFIG,
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OPTION_ROM_MICROCODE = 10,
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S_CRTM_VERSION,
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S_CRTM_CONTENTS,
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POST_CONTENTS,
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HOST_TABLE_OF_DEVICES,
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};
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static const char* tcpa_pc_event_id_strings[] = {
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"",
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"SMBIOS",
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"BIS Certificate",
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"POST BIOS ",
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"ESCD ",
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"CMOS",
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"NVRAM",
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"Option ROM",
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"Option ROM config",
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"",
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"Option ROM microcode ",
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"S-CRTM Version",
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"S-CRTM Contents ",
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"POST Contents ",
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"Table of Devices",
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};
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/* returns pointer to start of pos. entry of tcg log */
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static void *tpm_bios_measurements_start(struct seq_file *m, loff_t *pos)
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{
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loff_t i;
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struct tpm_bios_log *log = m->private;
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void *addr = log->bios_event_log;
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void *limit = log->bios_event_log_end;
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struct tcpa_event *event;
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/* read over *pos measurements */
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for (i = 0; i < *pos; i++) {
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event = addr;
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if ((addr + sizeof(struct tcpa_event)) < limit) {
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if (event->event_type == 0 && event->event_size == 0)
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return NULL;
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addr += sizeof(struct tcpa_event) + event->event_size;
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}
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}
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/* now check if current entry is valid */
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if ((addr + sizeof(struct tcpa_event)) >= limit)
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return NULL;
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event = addr;
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if ((event->event_type == 0 && event->event_size == 0) ||
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((addr + sizeof(struct tcpa_event) + event->event_size) >= limit))
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return NULL;
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return addr;
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}
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static void *tpm_bios_measurements_next(struct seq_file *m, void *v,
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loff_t *pos)
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{
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struct tcpa_event *event = v;
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struct tpm_bios_log *log = m->private;
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void *limit = log->bios_event_log_end;
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v += sizeof(struct tcpa_event) + event->event_size;
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/* now check if current entry is valid */
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if ((v + sizeof(struct tcpa_event)) >= limit)
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return NULL;
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event = v;
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if (event->event_type == 0 && event->event_size == 0)
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return NULL;
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if ((event->event_type == 0 && event->event_size == 0) ||
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((v + sizeof(struct tcpa_event) + event->event_size) >= limit))
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return NULL;
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(*pos)++;
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return v;
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}
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static void tpm_bios_measurements_stop(struct seq_file *m, void *v)
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{
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}
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static int get_event_name(char *dest, struct tcpa_event *event,
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unsigned char * event_entry)
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{
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const char *name = "";
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/* 41 so there is room for 40 data and 1 nul */
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char data[41] = "";
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int i, n_len = 0, d_len = 0;
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struct tcpa_pc_event *pc_event;
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switch(event->event_type) {
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case PREBOOT:
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case POST_CODE:
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case UNUSED:
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case NO_ACTION:
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case SCRTM_CONTENTS:
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case SCRTM_VERSION:
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case CPU_MICROCODE:
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case PLATFORM_CONFIG_FLAGS:
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case TABLE_OF_DEVICES:
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case COMPACT_HASH:
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case IPL:
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case IPL_PARTITION_DATA:
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case NONHOST_CODE:
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case NONHOST_CONFIG:
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case NONHOST_INFO:
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name = tcpa_event_type_strings[event->event_type];
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n_len = strlen(name);
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break;
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case SEPARATOR:
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case ACTION:
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if (MAX_TEXT_EVENT > event->event_size) {
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name = event_entry;
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n_len = event->event_size;
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}
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break;
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case EVENT_TAG:
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pc_event = (struct tcpa_pc_event *)event_entry;
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/* ToDo Row data -> Base64 */
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switch (pc_event->event_id) {
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case SMBIOS:
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case BIS_CERT:
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case CMOS:
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case NVRAM:
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case OPTION_ROM_EXEC:
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case OPTION_ROM_CONFIG:
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case S_CRTM_VERSION:
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name = tcpa_pc_event_id_strings[pc_event->event_id];
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n_len = strlen(name);
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break;
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/* hash data */
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case POST_BIOS_ROM:
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case ESCD:
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case OPTION_ROM_MICROCODE:
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case S_CRTM_CONTENTS:
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case POST_CONTENTS:
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name = tcpa_pc_event_id_strings[pc_event->event_id];
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n_len = strlen(name);
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for (i = 0; i < 20; i++)
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d_len += sprintf(&data[2*i], "%02x",
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pc_event->event_data[i]);
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break;
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default:
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break;
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}
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default:
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break;
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}
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return snprintf(dest, MAX_TEXT_EVENT, "[%.*s%.*s]",
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n_len, name, d_len, data);
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}
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static int tpm_binary_bios_measurements_show(struct seq_file *m, void *v)
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{
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struct tcpa_event *event = v;
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char *data = v;
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int i;
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for (i = 0; i < sizeof(struct tcpa_event) + event->event_size; i++)
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seq_putc(m, data[i]);
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return 0;
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}
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static int tpm_bios_measurements_release(struct inode *inode,
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struct file *file)
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{
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struct seq_file *seq = file->private_data;
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struct tpm_bios_log *log = seq->private;
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if (log) {
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kfree(log->bios_event_log);
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kfree(log);
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}
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return seq_release(inode, file);
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}
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static int tpm_ascii_bios_measurements_show(struct seq_file *m, void *v)
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{
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int len = 0;
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int i;
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char *eventname;
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struct tcpa_event *event = v;
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unsigned char *event_entry =
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(unsigned char *) (v + sizeof(struct tcpa_event));
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eventname = kmalloc(MAX_TEXT_EVENT, GFP_KERNEL);
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if (!eventname) {
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printk(KERN_ERR "%s: ERROR - No Memory for event name\n ",
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__func__);
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return -EFAULT;
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}
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seq_printf(m, "%2d ", event->pcr_index);
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/* 2nd: SHA1 */
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for (i = 0; i < 20; i++)
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seq_printf(m, "%02x", event->pcr_value[i]);
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/* 3rd: event type identifier */
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seq_printf(m, " %02x", event->event_type);
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len += get_event_name(eventname, event, event_entry);
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/* 4th: eventname <= max + \'0' delimiter */
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seq_printf(m, " %s\n", eventname);
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kfree(eventname);
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return 0;
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}
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static const struct seq_operations tpm_ascii_b_measurments_seqops = {
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.start = tpm_bios_measurements_start,
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.next = tpm_bios_measurements_next,
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.stop = tpm_bios_measurements_stop,
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.show = tpm_ascii_bios_measurements_show,
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};
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static const struct seq_operations tpm_binary_b_measurments_seqops = {
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.start = tpm_bios_measurements_start,
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.next = tpm_bios_measurements_next,
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.stop = tpm_bios_measurements_stop,
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.show = tpm_binary_bios_measurements_show,
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};
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/* read binary bios log */
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static int read_log(struct tpm_bios_log *log)
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{
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struct acpi_tcpa *buff;
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acpi_status status;
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struct acpi_table_header *virt;
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u64 len, start;
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if (log->bios_event_log != NULL) {
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printk(KERN_ERR
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"%s: ERROR - Eventlog already initialized\n",
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__func__);
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return -EFAULT;
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}
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/* Find TCPA entry in RSDT (ACPI_LOGICAL_ADDRESSING) */
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status = acpi_get_table(ACPI_SIG_TCPA, 1,
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(struct acpi_table_header **)&buff);
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if (ACPI_FAILURE(status)) {
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printk(KERN_ERR "%s: ERROR - Could not get TCPA table\n",
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__func__);
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return -EIO;
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}
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switch(buff->platform_class) {
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case BIOS_SERVER:
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len = buff->server.log_max_len;
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start = buff->server.log_start_addr;
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break;
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case BIOS_CLIENT:
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default:
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len = buff->client.log_max_len;
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start = buff->client.log_start_addr;
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break;
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}
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if (!len) {
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printk(KERN_ERR "%s: ERROR - TCPA log area empty\n", __func__);
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return -EIO;
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}
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/* malloc EventLog space */
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log->bios_event_log = kmalloc(len, GFP_KERNEL);
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if (!log->bios_event_log) {
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printk("%s: ERROR - Not enough Memory for BIOS measurements\n",
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__func__);
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return -ENOMEM;
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}
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log->bios_event_log_end = log->bios_event_log + len;
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virt = acpi_os_map_memory(start, len);
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memcpy(log->bios_event_log, virt, len);
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acpi_os_unmap_memory(virt, len);
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return 0;
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}
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static int tpm_ascii_bios_measurements_open(struct inode *inode,
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struct file *file)
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{
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int err;
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struct tpm_bios_log *log;
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struct seq_file *seq;
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log = kzalloc(sizeof(struct tpm_bios_log), GFP_KERNEL);
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if (!log)
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return -ENOMEM;
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if ((err = read_log(log)))
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goto out_free;
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/* now register seq file */
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err = seq_open(file, &tpm_ascii_b_measurments_seqops);
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if (!err) {
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seq = file->private_data;
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seq->private = log;
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} else {
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goto out_free;
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}
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out:
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return err;
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out_free:
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kfree(log->bios_event_log);
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kfree(log);
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goto out;
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}
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static const struct file_operations tpm_ascii_bios_measurements_ops = {
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.open = tpm_ascii_bios_measurements_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = tpm_bios_measurements_release,
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};
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static int tpm_binary_bios_measurements_open(struct inode *inode,
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struct file *file)
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{
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int err;
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struct tpm_bios_log *log;
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struct seq_file *seq;
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log = kzalloc(sizeof(struct tpm_bios_log), GFP_KERNEL);
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if (!log)
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return -ENOMEM;
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if ((err = read_log(log)))
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goto out_free;
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/* now register seq file */
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err = seq_open(file, &tpm_binary_b_measurments_seqops);
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if (!err) {
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seq = file->private_data;
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seq->private = log;
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} else {
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goto out_free;
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}
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out:
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return err;
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out_free:
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kfree(log->bios_event_log);
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kfree(log);
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goto out;
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}
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static const struct file_operations tpm_binary_bios_measurements_ops = {
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.open = tpm_binary_bios_measurements_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = tpm_bios_measurements_release,
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};
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static int is_bad(void *p)
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{
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if (!p)
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return 1;
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if (IS_ERR(p) && (PTR_ERR(p) != -ENODEV))
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return 1;
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return 0;
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}
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struct dentry **tpm_bios_log_setup(char *name)
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{
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struct dentry **ret = NULL, *tpm_dir, *bin_file, *ascii_file;
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tpm_dir = securityfs_create_dir(name, NULL);
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if (is_bad(tpm_dir))
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goto out;
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bin_file =
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securityfs_create_file("binary_bios_measurements",
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S_IRUSR | S_IRGRP, tpm_dir, NULL,
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&tpm_binary_bios_measurements_ops);
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if (is_bad(bin_file))
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goto out_tpm;
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ascii_file =
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securityfs_create_file("ascii_bios_measurements",
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S_IRUSR | S_IRGRP, tpm_dir, NULL,
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&tpm_ascii_bios_measurements_ops);
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if (is_bad(ascii_file))
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goto out_bin;
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ret = kmalloc(3 * sizeof(struct dentry *), GFP_KERNEL);
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if (!ret)
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goto out_ascii;
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ret[0] = ascii_file;
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ret[1] = bin_file;
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ret[2] = tpm_dir;
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return ret;
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out_ascii:
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securityfs_remove(ascii_file);
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out_bin:
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securityfs_remove(bin_file);
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out_tpm:
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securityfs_remove(tpm_dir);
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out:
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return NULL;
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}
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EXPORT_SYMBOL_GPL(tpm_bios_log_setup);
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void tpm_bios_log_teardown(struct dentry **lst)
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{
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int i;
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for (i = 0; i < 3; i++)
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securityfs_remove(lst[i]);
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|
}
|
|
EXPORT_SYMBOL_GPL(tpm_bios_log_teardown);
|
|
MODULE_LICENSE("GPL");
|