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211 lines
4.0 KiB
211 lines
4.0 KiB
/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved. |
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* Use of this source code is governed by a BSD-style license that can be |
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* found in the LICENSE file. |
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* |
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* Routines for verifying a firmware image's signature. |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "2sysincludes.h" |
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#include "2api.h" |
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const char *gbb_fname; |
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const char *vblock_fname; |
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const char *body_fname; |
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/** |
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* Local implementation which reads resources from individual files. Could be |
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* more elegant and read from bios.bin, if we understood the fmap. |
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*/ |
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int vb2ex_read_resource(struct vb2_context *ctx, |
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enum vb2_resource_index index, |
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uint32_t offset, |
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void *buf, |
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uint32_t size) |
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{ |
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const char *fname; |
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FILE *f; |
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int got_size; |
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/* Get the filename for the resource */ |
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switch (index) { |
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case VB2_RES_GBB: |
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fname = gbb_fname; |
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break; |
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case VB2_RES_FW_VBLOCK: |
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fname = vblock_fname; |
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break; |
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default: |
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return VB2_ERROR_UNKNOWN; |
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} |
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/* Open file and seek to the requested offset */ |
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f = fopen(fname, "rb"); |
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if (!f) |
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return VB2_ERROR_UNKNOWN; |
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if (fseek(f, offset, SEEK_SET)) { |
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fclose(f); |
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return VB2_ERROR_UNKNOWN; |
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} |
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/* Read data and close file */ |
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got_size = fread(buf, 1, size, f); |
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fclose(f); |
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/* Return success if we read everything */ |
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return got_size == size ? VB2_SUCCESS : VB2_ERROR_UNKNOWN; |
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} |
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int vb2ex_tpm_clear_owner(struct vb2_context *ctx) |
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{ |
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// TODO: implement |
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return VB2_SUCCESS; |
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} |
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/** |
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* Save non-volatile and/or secure data if needed. |
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*/ |
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static void save_if_needed(struct vb2_context *ctx) |
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{ |
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if (ctx->flags & VB2_CONTEXT_NVDATA_CHANGED) { |
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// TODO: implement |
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ctx->flags &= ~VB2_CONTEXT_NVDATA_CHANGED; |
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} |
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if (ctx->flags & VB2_CONTEXT_SECDATA_CHANGED) { |
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// TODO: implement |
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ctx->flags &= ~VB2_CONTEXT_SECDATA_CHANGED; |
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} |
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} |
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/** |
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* Verify firmware body |
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*/ |
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static int hash_body(struct vb2_context *ctx) |
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{ |
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uint32_t expect_size; |
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uint8_t block[8192]; |
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uint32_t size; |
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FILE *f; |
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int rv; |
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/* Open the body data */ |
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f = fopen(body_fname, "rb"); |
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/* Start the body hash */ |
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rv = vb2api_init_hash(ctx, VB2_HASH_TAG_FW_BODY, &expect_size); |
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if (rv) |
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return rv; |
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printf("Expect %d bytes of body...\n", expect_size); |
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/* Extend over the body */ |
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while (expect_size) { |
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size = sizeof(block); |
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if (size > expect_size) |
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size = expect_size; |
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/* Read next body block */ |
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size = fread(block, 1, size, f); |
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if (size <= 0) |
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break; |
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/* Hash it */ |
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rv = vb2api_extend_hash(ctx, block, size); |
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if (rv) |
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return rv; |
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expect_size -= size; |
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} |
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/* Check the result */ |
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rv = vb2api_check_hash(ctx); |
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if (rv) |
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return rv; |
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return VB2_SUCCESS; |
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} |
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static void print_help(const char *progname) |
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{ |
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printf("Usage: %s <gbb> <vblock> <body>\n", progname); |
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} |
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int main(int argc, char *argv[]) |
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{ |
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struct vb2_context ctx; |
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uint8_t workbuf[16384] __attribute__ ((aligned (VB2_WORKBUF_ALIGN))); |
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int rv; |
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if (argc < 4) { |
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print_help(argv[0]); |
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return 1; |
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} |
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/* Save filenames */ |
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gbb_fname = argv[1]; |
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vblock_fname = argv[2]; |
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body_fname = argv[3]; |
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/* Set up context */ |
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memset(&ctx, 0, sizeof(ctx)); |
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ctx.workbuf = workbuf; |
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ctx.workbuf_size = sizeof(workbuf); |
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/* Initialize secure context */ |
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rv = vb2api_secdata_create(&ctx); |
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if (rv) { |
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fprintf(stderr, |
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"error: vb2api_secdata_create() failed (%d)\n", rv); |
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return 1; |
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} |
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// TODO: optional args to set contents for nvdata, secdata? |
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/* Do early init */ |
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printf("Phase 1...\n"); |
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rv = vb2api_fw_phase1(&ctx); |
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if (rv) { |
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printf("Phase 1 wants recovery mode.\n"); |
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save_if_needed(&ctx); |
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return rv; |
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} |
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/* Determine which firmware slot to boot */ |
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printf("Phase 2...\n"); |
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rv = vb2api_fw_phase2(&ctx); |
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if (rv) { |
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printf("Phase 2 wants reboot.\n"); |
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save_if_needed(&ctx); |
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return rv; |
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} |
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/* Try that slot */ |
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printf("Phase 3...\n"); |
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rv = vb2api_fw_phase3(&ctx); |
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if (rv) { |
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printf("Phase 3 wants reboot.\n"); |
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save_if_needed(&ctx); |
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return rv; |
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} |
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/* Verify body */ |
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printf("Hash body...\n"); |
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rv = hash_body(&ctx); |
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save_if_needed(&ctx); |
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if (rv) { |
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printf("Phase 4 wants reboot.\n"); |
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return rv; |
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} |
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printf("Yaay!\n"); |
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printf("Workbuf used = %d bytes\n", ctx.workbuf_used); |
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return 0; |
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}
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