1 /*
2 * Copyright 2014 The Chromium OS Authors. All rights reserved.
3 * Use of this source code is governed by a BSD-style license that can be
4 * found in the LICENSE file.
5 */
6
7 #include <errno.h>
8 #include <inttypes.h> /* For PRIu64 */
9 #include <stdio.h>
10 #include <string.h>
11 #include <unistd.h>
12 #include <openssl/rsa.h>
13
14 #include "file_type.h"
15 #include "futility.h"
16 #include "host_common.h"
17 #include "kernel_blob.h"
18 #include "util_misc.h"
19 #include "vb1_helper.h"
20
21 /****************************************************************************/
22 /* Here are globals containing all the bits & pieces I'm working on.
23 *
24 * kernel vblock = keyblock + kernel preamble + padding to 64K (or whatever)
25 * kernel blob = 32-bit kernel + config file + params + bootloader stub +
26 * vmlinuz_header
27 * kernel partition = kernel vblock + kernel blob
28 *
29 * The VbKernelPreambleHeader.preamble_size includes the padding.
30 */
31
32 /* The keyblock, preamble, and kernel blob are kept in separate places. */
33 static VbKeyBlockHeader *g_keyblock;
34 static VbKernelPreambleHeader *g_preamble;
35 static uint8_t *g_kernel_blob_data;
36 static uint64_t g_kernel_blob_size;
37
38 /* These refer to individual parts within the kernel blob. */
39 static uint8_t *g_kernel_data;
40 static uint64_t g_kernel_size;
41 static uint8_t *g_config_data;
42 static uint64_t g_config_size;
43 static uint8_t *g_param_data;
44 static uint64_t g_param_size;
45 static uint8_t *g_bootloader_data;
46 static uint64_t g_bootloader_size;
47 static uint8_t *g_vmlinuz_header_data;
48 static uint64_t g_vmlinuz_header_size;
49
50 static uint64_t g_ondisk_bootloader_addr;
51 static uint64_t g_ondisk_vmlinuz_header_addr;
52
53
54 /*
55 * Read the kernel command line from a file. Get rid of \n characters along
56 * the way and verify that the line fits into a 4K buffer.
57 *
58 * Return the buffer contaning the line on success (and set the line length
59 * using the passed in parameter), or NULL in case something goes wrong.
60 */
ReadConfigFile(const char * config_file,uint64_t * config_size)61 uint8_t *ReadConfigFile(const char *config_file, uint64_t *config_size)
62 {
63 uint8_t *config_buf;
64 int i;
65
66 config_buf = ReadFile(config_file, config_size);
67 if (!config_buf)
68 return NULL;
69 Debug(" config file size=0x%" PRIx64 "\n", *config_size);
70 if (CROS_CONFIG_SIZE <= *config_size) { /* room for trailing '\0' */
71 fprintf(stderr, "Config file %s is too large (>= %d bytes)\n",
72 config_file, CROS_CONFIG_SIZE);
73 return NULL;
74 }
75
76 /* Replace newlines with spaces */
77 for (i = 0; i < *config_size; i++)
78 if ('\n' == config_buf[i])
79 config_buf[i] = ' ';
80
81 return config_buf;
82 }
83
84 /****************************************************************************/
85
86 /* Return the smallest integral multiple of [alignment] that is equal
87 * to or greater than [val]. Used to determine the number of
88 * pages/sectors/blocks/whatever needed to contain [val]
89 * items/bytes/etc. */
roundup(uint64_t val,uint64_t alignment)90 static uint64_t roundup(uint64_t val, uint64_t alignment)
91 {
92 uint64_t rem = val % alignment;
93 if (rem)
94 return val + (alignment - rem);
95 return val;
96 }
97
98 /* Match regexp /\b--\b/ to delimit the start of the kernel commandline. If we
99 * don't find one, we'll use the whole thing. */
find_cmdline_start(uint8_t * buf_ptr,unsigned int max_len)100 static unsigned int find_cmdline_start(uint8_t *buf_ptr, unsigned int max_len)
101 {
102 char *input = (char *)buf_ptr;
103 int start = 0;
104 int i;
105 for (i = 0; i < max_len - 1 && input[i]; i++) {
106 if ('-' == input[i] && '-' == input[i + 1]) {
107 if ((i == 0 || ' ' == input[i - 1]) &&
108 (i + 2 >= max_len || ' ' == input[i + 2])) {
109 /* found "--" with nothing before or after it */
110 start = i + 2; /* hope for a trailing '\0' */
111 break;
112 }
113 }
114 }
115 while (' ' == input[start]) /* skip leading spaces */
116 start++;
117
118 return start;
119 }
120
121 /* Offset of kernel command line string from the start of the kernel blob */
KernelCmdLineOffset(VbKernelPreambleHeader * preamble)122 uint64_t KernelCmdLineOffset(VbKernelPreambleHeader *preamble)
123 {
124 return preamble->bootloader_address - preamble->body_load_address -
125 CROS_CONFIG_SIZE - CROS_PARAMS_SIZE;
126 }
127
128 /* Returns the size of the 32-bit kernel, or negative on error. */
KernelSize(uint8_t * kernel_buf,uint64_t kernel_size,enum arch_t arch)129 static int KernelSize(uint8_t *kernel_buf, uint64_t kernel_size,
130 enum arch_t arch)
131 {
132 uint64_t kernel32_start = 0;
133 struct linux_kernel_params *lh;
134
135 /* Except for x86, the kernel is the kernel. */
136 if (arch != ARCH_X86)
137 return kernel_size;
138
139 /* The first part of the x86 vmlinuz is a header, followed by
140 * a real-mode boot stub. We only want the 32-bit part. */
141 lh = (struct linux_kernel_params *)kernel_buf;
142 kernel32_start = (lh->setup_sects + 1) << 9;
143 if (kernel32_start >= kernel_size) {
144 fprintf(stderr, "Malformed kernel\n");
145 return -1;
146 }
147 return kernel_size - kernel32_start;
148 }
149
150 /* This extracts g_kernel_* and g_param_* from a standard vmlinuz file.
151 * It returns nonzero on error. */
PickApartVmlinuz(uint8_t * kernel_buf,uint64_t kernel_size,enum arch_t arch,uint64_t kernel_body_load_address)152 static int PickApartVmlinuz(uint8_t *kernel_buf, uint64_t kernel_size,
153 enum arch_t arch,
154 uint64_t kernel_body_load_address)
155 {
156 uint64_t kernel32_start = 0;
157 uint64_t kernel32_size = kernel_size;
158 struct linux_kernel_params *lh, *params;
159
160 /* Except for x86, the kernel is the kernel. */
161 if (arch == ARCH_X86) {
162 /* The first part of the x86 vmlinuz is a header, followed by
163 * a real-mode boot stub. We only want the 32-bit part. */
164 lh = (struct linux_kernel_params *)kernel_buf;
165 kernel32_start = (lh->setup_sects + 1) << 9;
166 if (kernel32_start >= kernel_size) {
167 fprintf(stderr, "Malformed kernel\n");
168 return -1;
169 }
170 kernel32_size = kernel_size - kernel32_start;
171
172 Debug(" kernel16_start=0x%" PRIx64 "\n", 0);
173 Debug(" kernel16_size=0x%" PRIx64 "\n", kernel32_start);
174
175 /* Copy the original zeropage data from kernel_buf into
176 * g_param_data, then tweak a few fields for our purposes */
177 params = (struct linux_kernel_params *)(g_param_data);
178 Memcpy(&(params->setup_sects), &(lh->setup_sects),
179 offsetof(struct linux_kernel_params, e820_entries)
180 - offsetof(struct linux_kernel_params, setup_sects));
181 params->boot_flag = 0;
182 params->ramdisk_image = 0; /* we don't support initrd */
183 params->ramdisk_size = 0;
184 params->type_of_loader = 0xff;
185 /* We need to point to the kernel commandline arg. On disk, it
186 * will come right after the 32-bit part of the kernel. */
187 params->cmd_line_ptr = kernel_body_load_address +
188 roundup(kernel32_size, CROS_ALIGN) +
189 find_cmdline_start(g_config_data, g_config_size);
190 Debug(" cmdline_addr=0x%x\n", params->cmd_line_ptr);
191 Debug(" version=0x%x\n", params->version);
192 Debug(" kernel_alignment=0x%x\n", params->kernel_alignment);
193 Debug(" relocatable_kernel=0x%x\n", params->relocatable_kernel);
194 /* Add a fake e820 memory map with 2 entries. */
195 params->n_e820_entry = 2;
196 params->e820_entries[0].start_addr = 0x00000000;
197 params->e820_entries[0].segment_size = 0x00001000;
198 params->e820_entries[0].segment_type = E820_TYPE_RAM;
199 params->e820_entries[1].start_addr = 0xfffff000;
200 params->e820_entries[1].segment_size = 0x00001000;
201 params->e820_entries[1].segment_type = E820_TYPE_RESERVED;
202 }
203
204 Debug(" kernel32_start=0x%" PRIx64 "\n", kernel32_start);
205 Debug(" kernel32_size=0x%" PRIx64 "\n", kernel32_size);
206
207 /* Keep just the 32-bit kernel. */
208 if (kernel32_size) {
209 g_kernel_size = kernel32_size;
210 Memcpy(g_kernel_data, kernel_buf + kernel32_start,
211 g_kernel_size);
212 }
213
214 /* done */
215 return 0;
216 }
217
218 /* Split a kernel blob into separate g_kernel, g_param, g_config,
219 * g_bootloader, and g_vmlinuz_header parts. */
UnpackKernelBlob(uint8_t * kernel_blob_data)220 static void UnpackKernelBlob(uint8_t *kernel_blob_data)
221 {
222 uint64_t now;
223 uint64_t vmlinuz_header_size = 0;
224 uint64_t vmlinuz_header_address = 0;
225
226 /* We have to work backwards from the end, because the preamble
227 only describes the bootloader and vmlinuz stubs. */
228
229 /* Vmlinuz Header is at the end */
230 if (VbGetKernelVmlinuzHeader(g_preamble,
231 &vmlinuz_header_address,
232 &vmlinuz_header_size)
233 != VBOOT_SUCCESS) {
234 fprintf(stderr, "Unable to retrieve Vmlinuz Header!");
235 return;
236 }
237 if (vmlinuz_header_size) {
238 now = vmlinuz_header_address - g_preamble->body_load_address;
239 g_vmlinuz_header_size = vmlinuz_header_size;
240 g_vmlinuz_header_data = kernel_blob_data + now;
241
242 Debug("vmlinuz_header_size = 0x%" PRIx64 "\n",
243 g_vmlinuz_header_size);
244 Debug("vmlinuz_header_ofs = 0x%" PRIx64 "\n", now);
245 }
246
247 /* Where does the bootloader stub begin? */
248 now = g_preamble->bootloader_address - g_preamble->body_load_address;
249
250 /* Bootloader is at the end */
251 g_bootloader_size = g_preamble->bootloader_size;
252 g_bootloader_data = kernel_blob_data + now;
253 /* TODO: What to do if this is beyond the end of the blob? */
254
255 Debug("bootloader_size = 0x%" PRIx64 "\n", g_bootloader_size);
256 Debug("bootloader_ofs = 0x%" PRIx64 "\n", now);
257
258 /* Before that is the params */
259 now -= CROS_PARAMS_SIZE;
260 g_param_size = CROS_PARAMS_SIZE;
261 g_param_data = kernel_blob_data + now;
262 Debug("param_ofs = 0x%" PRIx64 "\n", now);
263
264 /* Before that is the config */
265 now -= CROS_CONFIG_SIZE;
266 g_config_size = CROS_CONFIG_SIZE;
267 g_config_data = kernel_blob_data + now;
268 Debug("config_ofs = 0x%" PRIx64 "\n", now);
269
270 /* The kernel starts at offset 0 and extends up to the config */
271 g_kernel_data = kernel_blob_data;
272 g_kernel_size = now;
273 Debug("kernel_size = 0x%" PRIx64 "\n", g_kernel_size);
274 }
275
276
277 /* Replaces the config section of the specified kernel blob.
278 * Return nonzero on error. */
UpdateKernelBlobConfig(uint8_t * kblob_data,uint64_t kblob_size,uint8_t * config_data,uint64_t config_size)279 int UpdateKernelBlobConfig(uint8_t *kblob_data, uint64_t kblob_size,
280 uint8_t *config_data, uint64_t config_size)
281 {
282 /* We should have already examined this blob. If not, we could do it
283 * again, but it's more likely due to an error. */
284 if (kblob_data != g_kernel_blob_data ||
285 kblob_size != g_kernel_blob_size) {
286 fprintf(stderr, "Trying to update some other blob\n");
287 return -1;
288 }
289
290 Memset(g_config_data, 0, g_config_size);
291 Memcpy(g_config_data, config_data, config_size);
292
293 return 0;
294 }
295
296 /* Split a kernel partition into separate vblock and blob parts. */
UnpackKPart(uint8_t * kpart_data,uint64_t kpart_size,uint64_t padding,VbKeyBlockHeader ** keyblock_ptr,VbKernelPreambleHeader ** preamble_ptr,uint64_t * blob_size_ptr)297 uint8_t *UnpackKPart(uint8_t *kpart_data, uint64_t kpart_size,
298 uint64_t padding,
299 VbKeyBlockHeader **keyblock_ptr,
300 VbKernelPreambleHeader **preamble_ptr,
301 uint64_t *blob_size_ptr)
302 {
303 VbKeyBlockHeader *keyblock;
304 VbKernelPreambleHeader *preamble;
305 uint64_t vmlinuz_header_size = 0;
306 uint64_t vmlinuz_header_address = 0;
307 uint64_t now = 0;
308 uint32_t flags = 0;
309
310 /* Sanity-check the keyblock */
311 keyblock = (VbKeyBlockHeader *)kpart_data;
312 Debug("Keyblock is 0x%" PRIx64 " bytes\n", keyblock->key_block_size);
313 now += keyblock->key_block_size;
314 if (now > kpart_size) {
315 fprintf(stderr,
316 "key_block_size advances past the end of the blob\n");
317 return NULL;
318 }
319 if (now > padding) {
320 fprintf(stderr,
321 "key_block_size advances past %" PRIu64
322 " byte padding\n",
323 padding);
324 return NULL;
325 }
326
327 /* LGTM */
328 g_keyblock = keyblock;
329
330 /* And the preamble */
331 preamble = (VbKernelPreambleHeader *)(kpart_data + now);
332 Debug("Preamble is 0x%" PRIx64 " bytes\n", preamble->preamble_size);
333 now += preamble->preamble_size;
334 if (now > kpart_size) {
335 fprintf(stderr,
336 "preamble_size advances past the end of the blob\n");
337 return NULL;
338 }
339 if (now > padding) {
340 fprintf(stderr, "preamble_size advances past %" PRIu64
341 " byte padding\n", padding);
342 return NULL;
343 }
344 /* LGTM */
345 Debug(" kernel_version = %d\n", preamble->kernel_version);
346 Debug(" bootloader_address = 0x%" PRIx64 "\n",
347 preamble->bootloader_address);
348 Debug(" bootloader_size = 0x%" PRIx64 "\n", preamble->bootloader_size);
349 Debug(" kern_blob_size = 0x%" PRIx64 "\n",
350 preamble->body_signature.data_size);
351
352 if (VbKernelHasFlags(preamble) == VBOOT_SUCCESS)
353 flags = preamble->flags;
354 Debug(" flags = 0x%" PRIx32 "\n", flags);
355
356 g_preamble = preamble;
357 g_ondisk_bootloader_addr = g_preamble->bootloader_address;
358
359 if (VbGetKernelVmlinuzHeader(preamble,
360 &vmlinuz_header_address,
361 &vmlinuz_header_size)
362 != VBOOT_SUCCESS) {
363 fprintf(stderr, "Unable to retrieve Vmlinuz Header!");
364 return NULL;
365 }
366 if (vmlinuz_header_size) {
367 Debug(" vmlinuz_header_address = 0x%" PRIx64 "\n",
368 vmlinuz_header_address);
369 Debug(" vmlinuz_header_size = 0x%" PRIx64 "\n",
370 vmlinuz_header_size);
371 g_ondisk_vmlinuz_header_addr = vmlinuz_header_address;
372 }
373
374 Debug("kernel blob is at offset 0x%" PRIx64 "\n", now);
375 g_kernel_blob_data = kpart_data + now;
376 g_kernel_blob_size = preamble->body_signature.data_size;
377
378 /* Sanity check */
379 if (g_kernel_blob_size < preamble->body_signature.data_size)
380 fprintf(stderr,
381 "Warning: kernel file only has 0x%" PRIx64 " bytes\n",
382 g_kernel_blob_size);
383
384 /* Update the blob pointers */
385 UnpackKernelBlob(g_kernel_blob_data);
386
387 if (keyblock_ptr)
388 *keyblock_ptr = keyblock;
389 if (preamble_ptr)
390 *preamble_ptr = preamble;
391 if (blob_size_ptr)
392 *blob_size_ptr = g_kernel_blob_size;
393
394 return g_kernel_blob_data;
395 }
396
SignKernelBlob(uint8_t * kernel_blob,uint64_t kernel_size,uint64_t padding,int version,uint64_t kernel_body_load_address,VbKeyBlockHeader * keyblock,VbPrivateKey * signpriv_key,uint32_t flags,uint64_t * vblock_size_ptr)397 uint8_t *SignKernelBlob(uint8_t *kernel_blob, uint64_t kernel_size,
398 uint64_t padding,
399 int version, uint64_t kernel_body_load_address,
400 VbKeyBlockHeader *keyblock, VbPrivateKey *signpriv_key,
401 uint32_t flags, uint64_t *vblock_size_ptr)
402 {
403 VbSignature *body_sig;
404 VbKernelPreambleHeader *preamble;
405 uint64_t min_size = padding > keyblock->key_block_size
406 ? padding - keyblock->key_block_size : 0;
407 void *outbuf;
408 uint64_t outsize;
409
410 /* Sign the kernel data */
411 body_sig = CalculateSignature(kernel_blob, kernel_size, signpriv_key);
412 if (!body_sig) {
413 fprintf(stderr, "Error calculating body signature\n");
414 return NULL;
415 }
416
417 /* Create preamble */
418 preamble = CreateKernelPreamble(version,
419 kernel_body_load_address,
420 g_ondisk_bootloader_addr,
421 g_bootloader_size,
422 body_sig,
423 g_ondisk_vmlinuz_header_addr,
424 g_vmlinuz_header_size,
425 flags,
426 min_size,
427 signpriv_key);
428 if (!preamble) {
429 fprintf(stderr, "Error creating preamble.\n");
430 return 0;
431 }
432
433 outsize = keyblock->key_block_size + preamble->preamble_size;
434 outbuf = malloc(outsize);
435 Memset(outbuf, 0, outsize);
436 Memcpy(outbuf, keyblock, keyblock->key_block_size);
437 Memcpy(outbuf + keyblock->key_block_size,
438 preamble, preamble->preamble_size);
439
440 if (vblock_size_ptr)
441 *vblock_size_ptr = outsize;
442 return outbuf;
443 }
444
445 /* Returns zero on success */
WriteSomeParts(const char * outfile,void * part1_data,uint64_t part1_size,void * part2_data,uint64_t part2_size)446 int WriteSomeParts(const char *outfile,
447 void *part1_data, uint64_t part1_size,
448 void *part2_data, uint64_t part2_size)
449 {
450 FILE *f;
451
452 /* Write the output file */
453 Debug("writing %s with 0x%" PRIx64 ", 0x%" PRIx64 "\n",
454 outfile, part1_size, part2_size);
455
456 f = fopen(outfile, "wb");
457 if (!f) {
458 fprintf(stderr, "Can't open output file %s: %s\n",
459 outfile, strerror(errno));
460 return -1;
461 }
462
463 if (part1_data && part1_size) {
464 if (1 != fwrite(part1_data, part1_size, 1, f)) {
465 fprintf(stderr, "Can't write output file %s: %s\n",
466 outfile, strerror(errno));
467 fclose(f);
468 unlink(outfile);
469 return -1;
470 }
471 }
472
473 if (part2_data && part2_size) {
474 if (1 != fwrite(part2_data, part2_size, 1, f)) {
475 fprintf(stderr, "Can't write output file %s: %s\n",
476 outfile, strerror(errno));
477 fclose(f);
478 unlink(outfile);
479 return -1;
480 }
481 }
482
483 fclose(f);
484
485 /* Success */
486 return 0;
487 }
488
489 /* Returns 0 on success */
VerifyKernelBlob(uint8_t * kernel_blob,uint64_t kernel_size,VbPublicKey * signpub_key,const char * keyblock_outfile,uint64_t min_version)490 int VerifyKernelBlob(uint8_t *kernel_blob,
491 uint64_t kernel_size,
492 VbPublicKey *signpub_key,
493 const char *keyblock_outfile,
494 uint64_t min_version)
495 {
496 VbPublicKey *data_key;
497 RSAPublicKey *rsa;
498 int rv = -1;
499 uint64_t vmlinuz_header_size = 0;
500 uint64_t vmlinuz_header_address = 0;
501
502 if (0 != KeyBlockVerify(g_keyblock, g_keyblock->key_block_size,
503 signpub_key, (0 == signpub_key))) {
504 fprintf(stderr, "Error verifying key block.\n");
505 goto done;
506 }
507
508 printf("Key block:\n");
509 data_key = &g_keyblock->data_key;
510 printf(" Signature: %s\n",
511 signpub_key ? "valid" : "ignored");
512 printf(" Size: 0x%" PRIx64 "\n",
513 g_keyblock->key_block_size);
514 printf(" Flags: %" PRIu64 " ",
515 g_keyblock->key_block_flags);
516 if (g_keyblock->key_block_flags & KEY_BLOCK_FLAG_DEVELOPER_0)
517 printf(" !DEV");
518 if (g_keyblock->key_block_flags & KEY_BLOCK_FLAG_DEVELOPER_1)
519 printf(" DEV");
520 if (g_keyblock->key_block_flags & KEY_BLOCK_FLAG_RECOVERY_0)
521 printf(" !REC");
522 if (g_keyblock->key_block_flags & KEY_BLOCK_FLAG_RECOVERY_1)
523 printf(" REC");
524 printf("\n");
525 printf(" Data key algorithm: %" PRIu64 " %s\n", data_key->algorithm,
526 (data_key->algorithm < kNumAlgorithms ?
527 algo_strings[data_key->algorithm] : "(invalid)"));
528 printf(" Data key version: %" PRIu64 "\n", data_key->key_version);
529 printf(" Data key sha1sum: ");
530 PrintPubKeySha1Sum(data_key);
531 printf("\n");
532
533 if (keyblock_outfile) {
534 FILE *f = NULL;
535 f = fopen(keyblock_outfile, "wb");
536 if (!f) {
537 fprintf(stderr, "Can't open key block file %s: %s\n",
538 keyblock_outfile, strerror(errno));
539 goto done;
540 }
541 if (1 != fwrite(g_keyblock, g_keyblock->key_block_size, 1, f)) {
542 fprintf(stderr, "Can't write key block file %s: %s\n",
543 keyblock_outfile, strerror(errno));
544 fclose(f);
545 goto done;
546 }
547 fclose(f);
548 }
549
550 if (data_key->key_version < (min_version >> 16)) {
551 fprintf(stderr, "Data key version %" PRIu64
552 " is lower than minimum %" PRIu64 ".\n",
553 data_key->key_version, (min_version >> 16));
554 goto done;
555 }
556
557 rsa = PublicKeyToRSA(data_key);
558 if (!rsa) {
559 fprintf(stderr, "Error parsing data key.\n");
560 goto done;
561 }
562
563 /* Verify preamble */
564 if (0 != VerifyKernelPreamble(g_preamble,
565 g_preamble->preamble_size, rsa)) {
566 fprintf(stderr, "Error verifying preamble.\n");
567 goto done;
568 }
569
570 printf("Preamble:\n");
571 printf(" Size: 0x%" PRIx64 "\n",
572 g_preamble->preamble_size);
573 printf(" Header version: %" PRIu32 ".%" PRIu32 "\n",
574 g_preamble->header_version_major,
575 g_preamble->header_version_minor);
576 printf(" Kernel version: %" PRIu64 "\n",
577 g_preamble->kernel_version);
578 printf(" Body load address: 0x%" PRIx64 "\n",
579 g_preamble->body_load_address);
580 printf(" Body size: 0x%" PRIx64 "\n",
581 g_preamble->body_signature.data_size);
582 printf(" Bootloader address: 0x%" PRIx64 "\n",
583 g_preamble->bootloader_address);
584 printf(" Bootloader size: 0x%" PRIx64 "\n",
585 g_preamble->bootloader_size);
586
587 if (VbGetKernelVmlinuzHeader(g_preamble,
588 &vmlinuz_header_address,
589 &vmlinuz_header_size)
590 != VBOOT_SUCCESS) {
591 fprintf(stderr, "Unable to retrieve Vmlinuz Header!");
592 goto done;
593 }
594 if (vmlinuz_header_size) {
595 printf(" Vmlinuz header address: 0x%" PRIx64 "\n",
596 vmlinuz_header_address);
597 printf(" Vmlinuz header size: 0x%" PRIx64 "\n",
598 vmlinuz_header_size);
599 }
600
601 if (VbKernelHasFlags(g_preamble) == VBOOT_SUCCESS)
602 printf(" Flags : 0x%" PRIx32 "\n",
603 g_preamble->flags);
604
605 if (g_preamble->kernel_version < (min_version & 0xFFFF)) {
606 fprintf(stderr,
607 "Kernel version %" PRIu64 " is lower than minimum %"
608 PRIu64 ".\n", g_preamble->kernel_version,
609 (min_version & 0xFFFF));
610 goto done;
611 }
612
613 /* Verify body */
614 if (0 != VerifyData(kernel_blob, kernel_size,
615 &g_preamble->body_signature, rsa)) {
616 fprintf(stderr, "Error verifying kernel body.\n");
617 goto done;
618 }
619 printf("Body verification succeeded.\n");
620
621 printf("Config:\n%s\n", kernel_blob + KernelCmdLineOffset(g_preamble));
622
623 rv = 0;
624 done:
625 return rv;
626 }
627
628
CreateKernelBlob(uint8_t * vmlinuz_buf,uint64_t vmlinuz_size,enum arch_t arch,uint64_t kernel_body_load_address,uint8_t * config_data,uint64_t config_size,uint8_t * bootloader_data,uint64_t bootloader_size,uint64_t * blob_size_ptr)629 uint8_t *CreateKernelBlob(uint8_t *vmlinuz_buf, uint64_t vmlinuz_size,
630 enum arch_t arch, uint64_t kernel_body_load_address,
631 uint8_t *config_data, uint64_t config_size,
632 uint8_t *bootloader_data, uint64_t bootloader_size,
633 uint64_t *blob_size_ptr)
634 {
635 uint64_t now = 0;
636 int tmp;
637
638 /* We have all the parts. How much room do we need? */
639 tmp = KernelSize(vmlinuz_buf, vmlinuz_size, arch);
640 if (tmp < 0)
641 return NULL;
642 g_kernel_size = tmp;
643 g_config_size = CROS_CONFIG_SIZE;
644 g_param_size = CROS_PARAMS_SIZE;
645 g_bootloader_size = roundup(bootloader_size, CROS_ALIGN);
646 g_vmlinuz_header_size = vmlinuz_size-g_kernel_size;
647 g_kernel_blob_size =
648 roundup(g_kernel_size, CROS_ALIGN) +
649 g_config_size +
650 g_param_size +
651 g_bootloader_size +
652 g_vmlinuz_header_size;
653 Debug("g_kernel_blob_size 0x%" PRIx64 "\n", g_kernel_blob_size);
654
655 /* Allocate space for the blob. */
656 g_kernel_blob_data = malloc(g_kernel_blob_size);
657 Memset(g_kernel_blob_data, 0, g_kernel_blob_size);
658
659 /* Assign the sub-pointers */
660 g_kernel_data = g_kernel_blob_data + now;
661 Debug("g_kernel_size 0x%" PRIx64 " ofs 0x%" PRIx64 "\n",
662 g_kernel_size, now);
663 now += roundup(g_kernel_size, CROS_ALIGN);
664
665 g_config_data = g_kernel_blob_data + now;
666 Debug("g_config_size 0x%" PRIx64 " ofs 0x%" PRIx64 "\n",
667 g_config_size, now);
668 now += g_config_size;
669
670 g_param_data = g_kernel_blob_data + now;
671 Debug("g_param_size 0x%" PRIx64 " ofs 0x%" PRIx64 "\n",
672 g_param_size, now);
673 now += g_param_size;
674
675 g_bootloader_data = g_kernel_blob_data + now;
676 Debug("g_bootloader_size 0x%" PRIx64 " ofs 0x%" PRIx64 "\n",
677 g_bootloader_size, now);
678 g_ondisk_bootloader_addr = kernel_body_load_address + now;
679 Debug("g_ondisk_bootloader_addr 0x%" PRIx64 "\n",
680 g_ondisk_bootloader_addr);
681 now += g_bootloader_size;
682
683 if (g_vmlinuz_header_size) {
684 g_vmlinuz_header_data = g_kernel_blob_data + now;
685 Debug("g_vmlinuz_header_size 0x%" PRIx64 " ofs 0x%" PRIx64 "\n",
686 g_vmlinuz_header_size, now);
687 g_ondisk_vmlinuz_header_addr = kernel_body_load_address + now;
688 Debug("g_ondisk_vmlinuz_header_addr 0x%" PRIx64 "\n",
689 g_ondisk_vmlinuz_header_addr);
690 }
691
692 Debug("end of kern_blob at kern_blob+0x%" PRIx64 "\n", now);
693
694 /* Copy the kernel and params bits into the correct places */
695 if (0 != PickApartVmlinuz(vmlinuz_buf, vmlinuz_size,
696 arch, kernel_body_load_address)) {
697 fprintf(stderr, "Error picking apart kernel file.\n");
698 free(g_kernel_blob_data);
699 g_kernel_blob_data = NULL;
700 g_kernel_blob_size = 0;
701 return NULL;
702 }
703
704 /* Copy the other bits too */
705 Memcpy(g_config_data, config_data, config_size);
706 Memcpy(g_bootloader_data, bootloader_data, bootloader_size);
707 if (g_vmlinuz_header_size) {
708 Memcpy(g_vmlinuz_header_data,
709 vmlinuz_buf,
710 g_vmlinuz_header_size);
711 }
712
713 if (blob_size_ptr)
714 *blob_size_ptr = g_kernel_blob_size;
715 return g_kernel_blob_data;
716 }
717
recognize_vblock1(uint8_t * buf,uint32_t len)718 enum futil_file_type recognize_vblock1(uint8_t *buf, uint32_t len)
719 {
720 VbKeyBlockHeader *key_block = (VbKeyBlockHeader *)buf;
721 VbPublicKey *pubkey = (VbPublicKey *)buf;
722 VbFirmwarePreambleHeader *fw_preamble;
723 VbKernelPreambleHeader *kern_preamble;
724 RSAPublicKey *rsa;
725
726 if (VBOOT_SUCCESS == KeyBlockVerify(key_block, len, NULL, 1)) {
727 rsa = PublicKeyToRSA(&key_block->data_key);
728 uint32_t more = key_block->key_block_size;
729
730 /* and firmware preamble too? */
731 fw_preamble = (VbFirmwarePreambleHeader *)(buf + more);
732 if (VBOOT_SUCCESS ==
733 VerifyFirmwarePreamble(fw_preamble, len - more, rsa))
734 return FILE_TYPE_FW_PREAMBLE;
735
736 /* or maybe kernel preamble? */
737 kern_preamble = (VbKernelPreambleHeader *)(buf + more);
738 if (VBOOT_SUCCESS ==
739 VerifyKernelPreamble(kern_preamble, len - more, rsa))
740 return FILE_TYPE_KERN_PREAMBLE;
741
742 /* no, just keyblock */
743 return FILE_TYPE_KEYBLOCK;
744 }
745
746 /* Maybe just a VbPublicKey? */
747 if (PublicKeyLooksOkay(pubkey, len))
748 return FILE_TYPE_PUBKEY;
749
750 return FILE_TYPE_UNKNOWN;
751 }
752
recognize_privkey(uint8_t * buf,uint32_t len)753 enum futil_file_type recognize_privkey(uint8_t *buf, uint32_t len)
754 {
755 VbPrivateKey key;
756 const unsigned char *start;
757
758 if (len < sizeof(key.algorithm))
759 return FILE_TYPE_UNKNOWN;
760
761 key.algorithm = *(typeof(key.algorithm) *)buf;
762 start = buf + sizeof(key.algorithm);
763 key.rsa_private_key = d2i_RSAPrivateKey(NULL, &start,
764 len - sizeof(key.algorithm));
765
766 if (key.rsa_private_key) {
767 RSA_free(key.rsa_private_key);
768 return FILE_TYPE_PRIVKEY;
769 }
770
771 return FILE_TYPE_UNKNOWN;
772 }
773