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util/intelmetool: Add bootguard information dump support

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With this implementation it's possible to detect the state
of bootguard in intel based systems. Currently it's WIP and
in a testphase. Handle it with care!

Changes done:
* Add support for reading msr
* Read ME firmware version
* Print bootguard state for ME > 9.1
* Make argument -s legacy
* Add argument -b for bootguard (and ME) dumping
* Add argument -m for ME dumping
* Opt out early if CPU is non Intel

Change-Id: Ifeec8e20fa8efc35d7db4c6a84be1f118dccfc4a
Signed-off-by: Philipp Deppenwiese <zaolin@das-labor.org>
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/16328
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
This commit is contained in:
Philipp Deppenwiese
2016-08-26 02:10:51 +02:00
committed by Patrick Rudolph
parent 5e9dc37818
commit 73add175cd
7 changed files with 259 additions and 33 deletions
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144
util/intelmetool/intelmetool.c
View File

@@ -16,23 +16,25 @@
#include <stdlib.h>
#include <getopt.h>
#include <unistd.h>
#include <string.h>
#include <cpuid.h>
#ifdef __NetBSD__
#include <machine/sysarch.h>
#endif
#include "intelmetool.h"
#include "me.h"
#include "mmap.h"
#include "intelmetool.h"
#include "msr.h"
#include "rcba.h"
#define FD2 0x3428
#define ME_COMMAND_DELAY 10000
extern int fd_mem;
int debug = 0;
static uint32_t fd2 = 0;
static int ME_major_ver = 0;
static int ME_minor_ver = 0;
static void dumpmem(uint8_t *phys, uint32_t size)
{
@@ -62,6 +64,17 @@ static void dumpmemfile(uint8_t *phys, uint32_t size)
fclose(fp);
}
static int isCPUGenuineIntel(void)
{
regs_t regs;
unsigned int level = 0;
unsigned int eax = 0;
__get_cpuid(level, &eax, &regs.ebx, &regs.ecx, &regs.edx);
return !strncmp((char *)&regs, "GenuineIntel", CPU_ID_SIZE-1);
}
/* You need >4GB total ram, in kernel cmdline, use 'mem=1000m'
* then this code will clone to absolute memory address 0xe0000000
* which can be read using a mmap tool at that offset.
@@ -278,7 +291,7 @@ static void dump_me_info(void)
usleep(ME_COMMAND_DELAY);
mei_reset();
usleep(ME_COMMAND_DELAY);
mkhi_get_fw_version();
mkhi_get_fw_version(&ME_major_ver, &ME_minor_ver);
usleep(ME_COMMAND_DELAY);
mei_reset();
usleep(ME_COMMAND_DELAY);
@@ -288,21 +301,98 @@ static void dump_me_info(void)
rehide_me();
}
static void dump_bootguard_info(void)
{
struct pci_dev *dev;
char namebuf[1024];
const char *name;
uint64_t bootguard = 0;
if (msr_bootguard(&bootguard, debug) < 0)
return;
if (pci_platform_scan())
exit(1);
if (activate_me())
exit(1);
dev = pci_me_interface_scan(&name, namebuf, sizeof(namebuf));
if (!dev) {
printf("Can't access ME PCI device\n");
return;
}
if (debug) {
printf("BootGuard MSR Output: 0x%" PRIx64 "\n", bootguard);
bootguard &= ~0xff;
}
if (ME_major_ver < 9 ||
(ME_major_ver == 9 && ME_minor_ver < 5) ||
!BOOTGUARD_CAPABILITY(bootguard)) {
print_cap("BootGuard ", 0);
printf(CGRN "\nYour system isn't bootguard ready. You can "
"flash other firmware!\n" RESET);
rehide_me();
return;
}
print_cap("BootGuard ", 1);
if (pci_read_long(dev, 0x40) & 0x10)
printf(CYEL "Your southbridge configuration is insecure!! "
"BootGuard keys can be overwritten or wiped, or you are "
"in developer mode.\n"
RESET);
switch (bootguard) {
case BOOTGUARD_DISABLED:
printf("ME Capability: %-43s: " CGRN "%s\n" RESET,
"BootGuard Mode", "Disabled");
printf(CGRN "\nYour system is bootguard ready but your vendor "
"disabled it. You can flash other firmware!\n" RESET);
break;
case BOOTGUARD_ENABLED_COMBI_MODE:
printf("ME Capability: %-43s: " CGRN "%s\n" RESET,
"BootGuard Mode", "Verified & Measured Boot");
printf(CRED "\nVerified boot is enabled. You can't flash other "
"firmware. !\n" RESET);
break;
case BOOTGUARD_ENABLED_MEASUREMENT_MODE:
printf("ME Capability: %-43s: " CGRN "%s\n" RESET,
"BootGuard Mode", "Measured Boot");
printf(CGRN "\nYour system is bootguard ready but only running "
"the measured boot mode. You can flash other firmware!\n"
RESET);
break;
case BOOTGUARD_ENABLED_VERIFIED_MODE:
printf("ME Capability: %-43s: " CGRN "%s\n" RESET,
"BootGuard Mode", "Verified Boot");
printf(CRED "\nVerified boot is enabled! You can't flash other "
"firmware.\n" RESET);
break;
}
rehide_me();
}
static void print_version(void)
{
printf("intelmetool v%s -- ", INTELMETOOL_VERSION);
printf("Copyright (C) 2015 Damien Zammit\n\n");
printf("Copyright (C) 2015 Damien Zammit\n");
printf("Copyright (C) 2017 Philipp Deppenwiese\n");
printf("Copyright (C) 2017 Patrick Rudolph\n\n");
printf(GPLV2COPYRIGHT);
}
static void print_usage(const char *name)
{
printf("usage: %s [-vh?sd]\n", name);
printf("usage: %s [-vh?smdb]\n", name);
printf("\n"
" -v | --version: print the version\n"
" -h | --help: print this help\n\n"
" -s | --show: dump all me information on console\n"
" -d | --debug: enable debug output\n"
" -v | --version: print the version\n"
" -h | --help: print this help\n\n"
" -d | --debug: enable debug output\n"
" -m | --me dump all me information on console\n"
" -b | --bootguard dump bootguard state of the platform\n"
"\n");
exit(1);
}
@@ -315,21 +405,27 @@ int main(int argc, char *argv[])
static struct option long_options[] = {
{"version", 0, 0, 'v'},
{"help", 0, 0, 'h'},
{"show", 0, 0, 's'},
{"me", 0, 0, 'm'},
{"bootguard", 0, 0, 'b'},
{"debug", 0, 0, 'd'},
{0, 0, 0, 0}
};
while ((opt = getopt_long(argc, argv, "vh?sd",
long_options, &option_index)) != EOF) {
while ((opt = getopt_long(argc, argv, "vh?smdb",
long_options, &option_index)) != EOF) {
switch (opt) {
case 'v':
print_version();
exit(0);
break;
case 's':
case 's': /* Legacy fallthrough */
case 'm':
cmd_exec = 1;
break;
case 'b':
cmd_exec = 2;
break;
break;
case 'd':
debug = 1;
break;
@@ -342,6 +438,9 @@ int main(int argc, char *argv[])
}
}
if (!cmd_exec)
print_usage(argv[0]);
#if defined(__FreeBSD__)
if (open("/dev/io", O_RDWR) < 0) {
perror("/dev/io");
@@ -367,16 +466,17 @@ int main(int argc, char *argv[])
perror("Can not open /dev/mem");
exit(1);
}
if (!isCPUGenuineIntel()) {
perror("Error CPU is not from Intel.");
exit(1);
}
#endif
switch(cmd_exec) {
case 1:
if (cmd_exec & 3)
dump_me_info();
break;
default:
print_usage(argv[0]);
break;
}
if (cmd_exec & 2)
dump_bootguard_info();
return 0;
}