507 lines
12 KiB
C
507 lines
12 KiB
C
/* intelmetool Dump interesting things about Management Engine even if hidden */
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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#include <stdio.h>
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#include <inttypes.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <unistd.h>
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#include <string.h>
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#include <cpuid.h>
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#include <sys/io.h>
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#ifdef __NetBSD__
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#include <machine/sysarch.h>
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#endif
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#include "intelmetool.h"
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#include "me.h"
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#include "mmap.h"
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#include "msr.h"
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#include "rcba.h"
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extern int fd_mem;
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int debug = 0;
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static uint32_t fd2 = 0;
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static int ME_major_ver = 0;
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static int ME_minor_ver = 0;
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static void dumpmem(uint8_t *phys, uint32_t size)
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{
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uint32_t i;
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printf("Dumping cloned ME memory:\n");
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for (i = 0; i < size; i++) {
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printf("%02X",*((uint8_t *) (phys + i)));
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}
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printf("\n");
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}
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static void zeroit(uint8_t *phys, uint32_t size)
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{
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uint32_t i;
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for (i = 0; i < size; i++) {
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*((uint8_t *) (phys + i)) = 0x00;
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}
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}
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static void dumpmemfile(uint8_t *phys, uint32_t size)
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{
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FILE *fp = fopen("medump.bin", "w");
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uint32_t i;
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for (i = 0; i < size; i++) {
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fprintf(fp, "%c", *((uint8_t *) (phys + i)));
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}
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fclose(fp);
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}
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static int isCPUGenuineIntel(void)
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{
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regs_t regs;
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unsigned int level = 0;
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unsigned int eax = 0;
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__get_cpuid(level, &eax, ®s.ebx, ®s.ecx, ®s.edx);
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return !strncmp((char *)®s, "GenuineIntel", CPU_ID_SIZE-1);
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}
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/* You need >4GB total ram, in kernel cmdline, use 'mem=1000m'
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* then this code will clone to absolute memory address 0xe0000000
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* which can be read using a mmap tool at that offset.
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* Real ME memory is located around top of memory minus 64MB. (I think)
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* so we avoid cloning to this part.
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*/
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static void dump_me_memory(void)
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{
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uintptr_t me_clone = 0x60000000;
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uint8_t *dump;
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dump = map_physical_exact((off_t)me_clone, (void *)me_clone, 0x2000000);
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if (dump == NULL) {
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printf("Could not map ME memory\n");
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return;
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}
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zeroit(dump, 0x2000000);
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printf("Send magic command for memory clone\n");
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mei_reset();
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usleep(ME_COMMAND_DELAY);
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void* ptr = &me_clone;
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int err = mkhi_debug_me_memory(ptr);
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if (!err) {
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printf("Wait a second...");
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usleep(ME_COMMAND_DELAY);
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printf("done\n\nHere are the first bytes:\n");
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dumpmemfile(dump, 0x2000000);
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//printf("Try reading 0x%zx with other mmap tool...\n"
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// "Press enter to quit, you only get one chance to run"
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// "this tool before reboot required for some reason\n",
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// me_clone);
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while (getc(stdin) != '\n') {};
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unmap_physical(dump, 0x2000000);
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}
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}
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static int pci_platform_scan(void)
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{
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struct pci_access *pacc;
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struct pci_dev *dev;
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char namebuf[1024];
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const char *name;
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pacc = pci_alloc();
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pacc->method = PCI_ACCESS_I386_TYPE1;
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pci_init(pacc);
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pci_scan_bus(pacc);
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for (dev=pacc->devices; dev; dev=dev->next) {
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pci_fill_info(dev, PCI_FILL_IDENT | PCI_FILL_BASES |
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PCI_FILL_SIZES | PCI_FILL_CLASS);
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name = pci_lookup_name(pacc, namebuf, sizeof(namebuf),
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PCI_LOOKUP_DEVICE, dev->vendor_id, dev->device_id);
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if (name == NULL)
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name = "<unknown>";
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if (dev->vendor_id != PCI_VENDOR_ID_INTEL)
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continue;
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if (PCI_DEV_NO_ME(dev->device_id)) {
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printf(CGRN "Good news, you have a `%s` so you have "
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"no ME present at all, continuing...\n\n"
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RESET, name);
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break;
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} else if (PCI_DEV_HAS_ME_DISABLE(dev->device_id)) {
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printf(CGRN "Good news, you have a `%s` so ME is "
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"present but can be disabled, continuing...\n\n"
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RESET, name);
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break;
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} else if (PCI_DEV_HAS_ME_DIFFICULT(dev->device_id)) {
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printf(CRED "Bad news, you have a `%s` so you have ME "
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"hardware on board and you can't control or "
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"disable it, continuing...\n\n" RESET, name);
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break;
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} else if (PCI_DEV_CAN_DISABLE_ME_IF_PRESENT(dev->device_id)) {
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printf(CYEL "Not sure if ME hardware is present "
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"because you have a `%s`, but it is possible to "
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"disable it if you do, continuing...\n\n" RESET,
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name);
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break;
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} else if (PCI_DEV_ME_NOT_SURE(dev->device_id)) {
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printf(CYEL "Found `%s`. Not sure whether you have ME "
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"hardware, exiting\n\n" RESET, name);
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pci_cleanup(pacc);
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return 1;
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}
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}
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if (dev != NULL &&
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!PCI_DEV_HAS_ME_DISABLE(dev->device_id) &&
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!PCI_DEV_HAS_ME_DIFFICULT(dev->device_id) &&
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!PCI_DEV_CAN_DISABLE_ME_IF_PRESENT(dev->device_id) &&
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!PCI_DEV_ME_NOT_SURE(dev->device_id)) {
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printf(CCYN "ME is not present on your board or unknown\n\n"
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RESET);
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pci_cleanup(pacc);
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return 1;
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}
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pci_cleanup(pacc);
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return 0;
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}
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static int activate_me(void)
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{
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const uint32_t rcba = get_rcba_phys();
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if (debug)
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printf("RCBA addr: 0x%08x\n", rcba);
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if (rcba > 0) {
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if (read_rcba32(FD2, &fd2)) {
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printf("Error reading RCBA\n");
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return 1;
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}
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if (write_rcba32(FD2, fd2 & ~0x2)) {
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printf("Error writing RCBA\n");
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return 1;
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}
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if (debug && (fd2 & 0x2))
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printf("MEI was hidden on PCI, now unlocked\n");
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else if (debug)
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printf("MEI not hidden on PCI, checking if visible\n");
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}
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return 0;
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}
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static void rehide_me(void)
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{
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const uint32_t rcba = get_rcba_phys();
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if (rcba > 0) {
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if (fd2 & 0x2) {
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if (debug)
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printf("Re-hiding MEI device...");
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if (read_rcba32(FD2, &fd2)) {
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printf("Error reading RCBA\n");
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return;
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}
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if (write_rcba32(FD2, fd2 | 0x2)) {
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printf("Error writing RCBA\n");
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return;
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}
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if (debug)
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printf("done\n");
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}
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}
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}
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static struct pci_dev *pci_me_interface_scan(const char **name, char *namebuf,
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int namebuf_size)
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{
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struct pci_access *pacc;
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struct pci_dev *dev;
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int me = 0;
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pacc = pci_alloc();
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pacc->method = PCI_ACCESS_I386_TYPE1;
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pci_init(pacc);
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pci_scan_bus(pacc);
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for (dev=pacc->devices; dev; dev=dev->next) {
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pci_fill_info(dev, PCI_FILL_IDENT | PCI_FILL_BASES |
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PCI_FILL_SIZES | PCI_FILL_CLASS);
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*name = pci_lookup_name(pacc, namebuf, namebuf_size,
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PCI_LOOKUP_DEVICE, dev->vendor_id, dev->device_id);
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if (dev->vendor_id != PCI_VENDOR_ID_INTEL)
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continue;
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if (PCI_DEV_HAS_SUPPORTED_ME(dev->device_id)) {
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me = 1;
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break;
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}
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}
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if (!me) {
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rehide_me();
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pci_cleanup(pacc);
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return NULL;
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}
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return dev;
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}
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static void dump_me_info(void)
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{
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struct pci_dev *dev;
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uint32_t stat, stat2;
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char namebuf[1024];
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const char *name = NULL;
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if (pci_platform_scan())
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return;
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dev = pci_me_interface_scan(&name, namebuf, sizeof(namebuf));
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if (!dev) {
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if (debug)
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printf("ME PCI device is hidden\n");
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if (activate_me())
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return;
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dev = pci_me_interface_scan(&name, namebuf, sizeof(namebuf));
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if (!dev) {
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printf("Can't find ME PCI device\n");
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return;
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}
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}
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if (name == NULL)
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name = "<unknown>";
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printf("MEI found: [%x:%x] %s\n\n",
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dev->vendor_id, dev->device_id, name);
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stat = pci_read_long(dev, 0x40);
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printf("ME Status : 0x%x\n", stat);
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stat2 = pci_read_long(dev, 0x48);
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printf("ME Status 2 : 0x%x\n\n", stat2);
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intel_me_status(stat, stat2);
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printf("\n");
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intel_me_extend_valid(dev);
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printf("\n");
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if (stat & 0xf000)
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printf("ME: has a broken implementation on your board with"
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"this firmware\n");
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if (intel_mei_setup(dev))
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goto out;
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usleep(ME_COMMAND_DELAY);
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mei_reset();
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usleep(ME_COMMAND_DELAY);
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if (mkhi_get_fw_version(&ME_major_ver, &ME_minor_ver))
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goto out;
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usleep(ME_COMMAND_DELAY);
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mei_reset();
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usleep(ME_COMMAND_DELAY);
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if (mkhi_get_fwcaps())
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goto out;
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usleep(ME_COMMAND_DELAY);
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out:
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rehide_me();
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}
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static void dump_bootguard_info(void)
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{
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struct pci_dev *dev;
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char namebuf[1024];
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const char *name = NULL;
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uint64_t bootguard = 0;
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if (pci_platform_scan())
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return;
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dev = pci_me_interface_scan(&name, namebuf, sizeof(namebuf));
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if (!dev) {
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if (debug)
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printf("ME PCI device is hidden\n");
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if (activate_me())
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return;
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dev = pci_me_interface_scan(&name, namebuf, sizeof(namebuf));
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if (!dev) {
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printf("Can't find ME PCI device\n");
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return;
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}
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}
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/* ME_major_ver is zero on some platforms (Mac) */
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if (ME_major_ver &&
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(ME_major_ver < 9 ||
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(ME_major_ver == 9 && ME_minor_ver < 5))) {
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print_cap("BootGuard ", 0);
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printf(CGRN "\nYour system isn't bootguard ready. You can "
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"flash other firmware!\n" RESET);
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rehide_me();
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return;
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}
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if (msr_bootguard(&bootguard, debug) < 0) {
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printf("ME Capability: %-43s: " CCYN "%s\n" RESET,
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"BootGuard Mode", "Unknown");
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rehide_me();
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return;
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}
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if (debug) {
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printf("BootGuard MSR Output: 0x%" PRIx64 "\n", bootguard);
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bootguard &= ~0xff;
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}
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print_cap("BootGuard ", 1);
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if (pci_read_long(dev, 0x40) & 0x10)
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printf(CYEL "Your southbridge configuration is insecure!! "
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"BootGuard keys can be overwritten or wiped, or you are "
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"in developer mode.\n"
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RESET);
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rehide_me();
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switch (bootguard) {
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case BOOTGUARD_DISABLED:
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printf("ME Capability: %-43s: " CGRN "%s\n" RESET,
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"BootGuard Mode", "Disabled");
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printf(CGRN "\nYour system is bootguard ready but your vendor "
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"disabled it. You can flash other firmware!\n" RESET);
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break;
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case BOOTGUARD_ENABLED_COMBI_MODE:
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printf("ME Capability: %-43s: " CGRN "%s\n" RESET,
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"BootGuard Mode", "Verified & Measured Boot");
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printf(CRED "\nVerified boot is enabled. You can't flash other "
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"firmware. !\n" RESET);
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break;
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case BOOTGUARD_ENABLED_MEASUREMENT_MODE:
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printf("ME Capability: %-43s: " CGRN "%s\n" RESET,
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"BootGuard Mode", "Measured Boot");
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printf(CGRN "\nYour system is bootguard ready but only running "
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"the measured boot mode. You can flash other firmware!\n"
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RESET);
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break;
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case BOOTGUARD_ENABLED_VERIFIED_MODE:
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printf("ME Capability: %-43s: " CGRN "%s\n" RESET,
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"BootGuard Mode", "Verified Boot");
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printf(CRED "\nVerified boot is enabled! You can't flash other "
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"firmware.\n" RESET);
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break;
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}
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}
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static void print_version(void)
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{
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printf("intelmetool v%s -- ", INTELMETOOL_VERSION);
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printf("Copyright (C) 2015 Damien Zammit\n");
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printf("Copyright (C) 2017 Philipp Deppenwiese\n");
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printf("Copyright (C) 2017 Patrick Rudolph\n\n");
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printf(GPLV2COPYRIGHT);
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}
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static void print_usage(const char *name)
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{
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printf("usage: %s [-vh?smdb]\n", name);
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printf("\n"
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" -v | --version: print the version\n"
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" -h | --help: print this help\n\n"
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" -d | --debug: enable debug output\n"
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" -m | --me dump all me information on console\n"
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" -b | --bootguard dump bootguard state of the platform\n"
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"\n");
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exit(1);
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}
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int main(int argc, char *argv[])
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{
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int opt, option_index = 0;
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unsigned cmd_exec = 0;
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static struct option long_options[] = {
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{"version", 0, 0, 'v'},
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{"help", 0, 0, 'h'},
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{"me", 0, 0, 'm'},
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{"bootguard", 0, 0, 'b'},
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{"debug", 0, 0, 'd'},
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{0, 0, 0, 0}
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};
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while ((opt = getopt_long(argc, argv, "vh?smdb",
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long_options, &option_index)) != EOF) {
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switch (opt) {
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case 'v':
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print_version();
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exit(0);
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break;
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case 's': /* Legacy fallthrough */
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case 'm':
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cmd_exec = 1;
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break;
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case 'b':
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cmd_exec = 2;
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break;
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break;
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case 'd':
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debug = 1;
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break;
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case 'h':
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case '?':
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default:
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print_usage(argv[0]);
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exit(0);
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break;
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}
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}
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if (!cmd_exec)
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print_usage(argv[0]);
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#if defined(__FreeBSD__)
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if (open("/dev/io", O_RDWR) < 0) {
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perror("/dev/io");
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#elif defined(__NetBSD__)
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# ifdef __i386__
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if (i386_iopl(3)) {
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perror("iopl");
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# else
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if (x86_64_iopl(3)) {
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perror("iopl");
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# endif
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#else
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if (iopl(3)) {
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perror("iopl");
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#endif
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printf("You need to be root.\n");
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exit(1);
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}
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#ifndef __DARWIN__
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fd_mem = open("/dev/mem", O_RDWR);
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if (fd_mem < 0) {
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perror("Can not open /dev/mem. Do you have disabled "
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"Secure Boot ?");
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exit(1);
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}
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if (!isCPUGenuineIntel()) {
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perror("Error CPU is not from Intel.");
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exit(1);
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}
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#endif
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if (cmd_exec & 3)
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dump_me_info();
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if (cmd_exec & 2)
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dump_bootguard_info();
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return 0;
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}
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