478 lines
14 KiB
C
478 lines
14 KiB
C
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/* Copyright 2015 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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* Tests for kernel verification library
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*/
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#include <stdio.h>
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#include "2api.h"
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#include "2common.h"
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#include "2misc.h"
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#include "2nvstorage.h"
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#include "2rsa.h"
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#include "2secdata.h"
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#include "2sysincludes.h"
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#include "test_common.h"
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#include "vb2_common.h"
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/* Common context for tests */
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static uint8_t workbuf[VB2_KERNEL_WORKBUF_RECOMMENDED_SIZE]
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__attribute__ ((aligned (VB2_WORKBUF_ALIGN)));
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static struct vb2_workbuf wb;
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static struct vb2_context *ctx;
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static struct vb2_shared_data *sd;
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/* Mocked function data */
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static struct {
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struct vb2_gbb_header h;
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struct vb2_packed_key recovery_key;
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char recovery_key_data[32];
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} mock_gbb;
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static struct {
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/* Keyblock */
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struct {
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struct vb2_keyblock kb;
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char data_key_data[16];
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uint8_t kbdata[128];
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uint8_t hash[VB2_SHA512_DIGEST_SIZE];
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} k;
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/* Preamble follows keyblock */
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struct {
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struct vb2_kernel_preamble pre;
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uint8_t predata[128];
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} p;
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} mock_vblock;
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static int mock_read_res_fail_on_call;
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static int mock_unpack_key_retval;
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static int mock_verify_keyblock_retval;
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static int mock_verify_preamble_retval;
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/* Type of test to reset for */
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enum reset_type {
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FOR_KEYBLOCK,
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FOR_PREAMBLE
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};
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static void rehash_keyblock(void)
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{
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struct vb2_keyblock *kb = &mock_vblock.k.kb;
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struct vb2_signature *hashsig = &mock_vblock.k.kb.keyblock_hash;
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struct vb2_digest_context dc;
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hashsig->sig_offset = vb2_offset_of(hashsig, mock_vblock.k.hash);
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hashsig->sig_size = sizeof(mock_vblock.k.hash);
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hashsig->data_size = hashsig->sig_offset;
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vb2_digest_init(&dc, VB2_HASH_SHA512);
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vb2_digest_extend(&dc, (const uint8_t *)kb, hashsig->data_size);
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vb2_digest_finalize(&dc, mock_vblock.k.hash, hashsig->sig_size);
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}
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static void reset_common_data(enum reset_type t)
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{
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struct vb2_keyblock *kb = &mock_vblock.k.kb;
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struct vb2_kernel_preamble *pre = &mock_vblock.p.pre;
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memset(workbuf, 0xaa, sizeof(workbuf));
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TEST_SUCC(vb2api_init(workbuf, sizeof(workbuf), &ctx),
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"vb2api_init failed");
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vb2_workbuf_from_ctx(ctx, &wb);
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sd = vb2_get_sd(ctx);
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vb2_nv_init(ctx);
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vb2api_secdata_kernel_create(ctx);
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vb2_secdata_kernel_init(ctx);
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mock_read_res_fail_on_call = 0;
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mock_unpack_key_retval = VB2_SUCCESS;
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mock_verify_keyblock_retval = VB2_SUCCESS;
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mock_verify_preamble_retval = VB2_SUCCESS;
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/* Set up mock data for verifying keyblock */
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sd->kernel_version_secdata = 0x20002;
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vb2_secdata_kernel_set(ctx, VB2_SECDATA_KERNEL_VERSIONS, 0x20002);
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mock_gbb.recovery_key.algorithm = 11;
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mock_gbb.recovery_key.key_offset =
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vb2_offset_of(&mock_gbb.recovery_key,
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&mock_gbb.recovery_key_data);
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mock_gbb.recovery_key.key_size = sizeof(mock_gbb.recovery_key_data);
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kb->keyblock_size = sizeof(mock_vblock.k);
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memcpy(kb->magic, VB2_KEYBLOCK_MAGIC, VB2_KEYBLOCK_MAGIC_SIZE);
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kb->keyblock_flags = VB2_KEYBLOCK_FLAG_DEVELOPER_1 |
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VB2_KEYBLOCK_FLAG_DEVELOPER_0 |
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VB2_KEYBLOCK_FLAG_RECOVERY_1 | VB2_KEYBLOCK_FLAG_RECOVERY_0;
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kb->header_version_major = VB2_KEYBLOCK_VERSION_MAJOR;
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kb->header_version_minor = VB2_KEYBLOCK_VERSION_MINOR;
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kb->data_key.algorithm = 7;
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kb->data_key.key_version = 2;
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kb->data_key.key_offset =
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vb2_offset_of(&mock_vblock.k, &mock_vblock.k.data_key_data) -
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vb2_offset_of(&mock_vblock.k, &kb->data_key);
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kb->data_key.key_size = sizeof(mock_vblock.k.data_key_data);
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strcpy(mock_vblock.k.data_key_data, "data key data!!");
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rehash_keyblock();
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pre->preamble_size = sizeof(mock_vblock.p);
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pre->kernel_version = 2;
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/* If verifying preamble, verify keyblock first to set up data key */
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if (t == FOR_PREAMBLE)
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vb2_load_kernel_keyblock(ctx);
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};
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/* Mocked functions */
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vb2_error_t vb2ex_read_resource(struct vb2_context *c,
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enum vb2_resource_index index, uint32_t offset,
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void *buf, uint32_t size)
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{
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uint8_t *rptr;
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uint32_t rsize;
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if (--mock_read_res_fail_on_call == 0)
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return VB2_ERROR_MOCK;
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switch(index) {
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case VB2_RES_GBB:
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rptr = (uint8_t *)&mock_gbb;
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rsize = sizeof(mock_gbb);
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break;
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case VB2_RES_KERNEL_VBLOCK:
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rptr = (uint8_t *)&mock_vblock;
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rsize = sizeof(mock_vblock);
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break;
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default:
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return VB2_ERROR_EX_READ_RESOURCE_INDEX;
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}
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if (offset > rsize || offset + size > rsize)
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return VB2_ERROR_EX_READ_RESOURCE_SIZE;
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memcpy(buf, rptr + offset, size);
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return VB2_SUCCESS;
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}
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vb2_error_t vb2_unpack_key_buffer(struct vb2_public_key *key,
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const uint8_t *buf, uint32_t size)
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{
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key->arrsize = 0;
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return mock_unpack_key_retval;
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}
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vb2_error_t vb2_verify_keyblock(struct vb2_keyblock *block, uint32_t size,
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const struct vb2_public_key *key,
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const struct vb2_workbuf *w)
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{
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return mock_verify_keyblock_retval;
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}
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vb2_error_t vb2_verify_kernel_preamble(struct vb2_kernel_preamble *preamble,
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uint32_t size,
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const struct vb2_public_key *key,
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const struct vb2_workbuf *w)
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{
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return mock_verify_preamble_retval;
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}
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/* Tests */
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static void verify_keyblock_hash_tests(void)
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{
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struct vb2_keyblock *kb = &mock_vblock.k.kb;
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/* Test successful call */
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reset_common_data(FOR_KEYBLOCK);
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TEST_SUCC(vb2_verify_keyblock_hash(kb, kb->keyblock_size, &wb),
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"Keyblock hash good");
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/* Sanity check keyblock */
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reset_common_data(FOR_KEYBLOCK);
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kb->magic[0] ^= 0xd0;
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TEST_EQ(vb2_verify_keyblock_hash(kb, kb->keyblock_size, &wb),
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VB2_ERROR_KEYBLOCK_MAGIC, "Keyblock sanity check");
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/*
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* Sanity check should be looking at the keyblock hash struct, not the
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* keyblock signature struct.
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*/
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reset_common_data(FOR_KEYBLOCK);
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kb->keyblock_hash.data_size = sizeof(*kb) - 1;
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TEST_EQ(vb2_verify_keyblock_hash(kb, kb->keyblock_size, &wb),
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VB2_ERROR_KEYBLOCK_SIGNED_TOO_LITTLE,
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"Keyblock check hash sig");
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reset_common_data(FOR_KEYBLOCK);
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wb.size = VB2_SHA512_DIGEST_SIZE - 1;
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TEST_EQ(vb2_verify_keyblock_hash(kb, kb->keyblock_size, &wb),
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VB2_ERROR_VDATA_WORKBUF_DIGEST,
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"Keyblock check hash workbuf digest");
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reset_common_data(FOR_KEYBLOCK);
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wb.size = VB2_SHA512_DIGEST_SIZE +
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sizeof(struct vb2_digest_context) - 1;
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TEST_EQ(vb2_verify_keyblock_hash(kb, kb->keyblock_size, &wb),
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VB2_ERROR_VDATA_WORKBUF_HASHING,
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"Keyblock check hash workbuf hashing");
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reset_common_data(FOR_KEYBLOCK);
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mock_vblock.k.data_key_data[0] ^= 0xa0;
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TEST_EQ(vb2_verify_keyblock_hash(kb, kb->keyblock_size, &wb),
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VB2_ERROR_KEYBLOCK_SIG_INVALID,
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"Keyblock check hash invalid");
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}
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static void load_kernel_keyblock_tests(void)
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{
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struct vb2_keyblock *kb = &mock_vblock.k.kb;
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struct vb2_packed_key *k;
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int expected_offset;
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/* Test successful call */
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reset_common_data(FOR_KEYBLOCK);
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expected_offset = sd->workbuf_used;
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TEST_SUCC(vb2_load_kernel_keyblock(ctx), "Kernel keyblock good");
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TEST_NEQ(sd->flags & VB2_SD_FLAG_KERNEL_SIGNED, 0, " Kernel signed");
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TEST_EQ(sd->kernel_version, 0x20000, "keyblock version");
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TEST_EQ(sd->vblock_preamble_offset, sizeof(mock_vblock.k),
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"preamble offset");
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TEST_EQ(sd->data_key_offset, expected_offset,
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"keyblock data key offset");
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TEST_EQ(sd->workbuf_used,
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vb2_wb_round_up(sd->data_key_offset +
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sd->data_key_size),
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"workbuf used");
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/* Make sure data key was properly saved */
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k = vb2_member_of(sd, sd->data_key_offset);
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TEST_EQ(k->algorithm, 7, "data key algorithm");
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TEST_EQ(k->key_version, 2, "data key version");
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TEST_EQ(k->key_size, sizeof(mock_vblock.k.data_key_data),
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"data key size");
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TEST_EQ(memcmp(vb2_member_of(k, k->key_offset),
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mock_vblock.k.data_key_data,
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sizeof(mock_vblock.k.data_key_data)),
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0, "data key data");
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TEST_EQ(sd->workbuf_used,
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vb2_wb_round_up(sd->data_key_offset +
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sd->data_key_size),
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"workbuf used after");
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/* Test failures */
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reset_common_data(FOR_KEYBLOCK);
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mock_unpack_key_retval = VB2_ERROR_MOCK;
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TEST_EQ(vb2_load_kernel_keyblock(ctx),
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VB2_ERROR_MOCK, "Kernel keyblock unpack key");
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reset_common_data(FOR_KEYBLOCK);
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sd->workbuf_used = sd->workbuf_size + VB2_WORKBUF_ALIGN -
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vb2_wb_round_up(sizeof(*kb));
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TEST_EQ(vb2_load_kernel_keyblock(ctx),
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VB2_ERROR_KERNEL_KEYBLOCK_WORKBUF_HEADER,
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"Kernel keyblock workbuf header");
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reset_common_data(FOR_KEYBLOCK);
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mock_read_res_fail_on_call = 1;
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TEST_EQ(vb2_load_kernel_keyblock(ctx),
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VB2_ERROR_MOCK, "Kernel keyblock read header");
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reset_common_data(FOR_KEYBLOCK);
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sd->workbuf_used = sd->workbuf_size + VB2_WORKBUF_ALIGN -
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vb2_wb_round_up(kb->keyblock_size);
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TEST_EQ(vb2_load_kernel_keyblock(ctx),
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VB2_ERROR_KERNEL_KEYBLOCK_WORKBUF,
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"Kernel keyblock workbuf");
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reset_common_data(FOR_KEYBLOCK);
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mock_read_res_fail_on_call = 2;
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TEST_EQ(vb2_load_kernel_keyblock(ctx),
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VB2_ERROR_MOCK, "Kernel keyblock read");
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/* Normally, require signed keyblock */
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reset_common_data(FOR_KEYBLOCK);
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mock_verify_keyblock_retval = VB2_ERROR_MOCK;
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TEST_EQ(vb2_load_kernel_keyblock(ctx),
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VB2_ERROR_MOCK, "Verify keyblock");
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/* Not in dev mode */
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reset_common_data(FOR_KEYBLOCK);
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ctx->flags |= VB2_CONTEXT_DEVELOPER_MODE;
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mock_verify_keyblock_retval = VB2_ERROR_MOCK;
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TEST_SUCC(vb2_load_kernel_keyblock(ctx), "Kernel keyblock hash good");
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TEST_EQ(sd->flags & VB2_SD_FLAG_KERNEL_SIGNED, 0, " Kernel signed");
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/* But we do in dev+rec mode */
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reset_common_data(FOR_KEYBLOCK);
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ctx->flags |= VB2_CONTEXT_DEVELOPER_MODE | VB2_CONTEXT_RECOVERY_MODE;
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mock_verify_keyblock_retval = VB2_ERROR_MOCK;
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TEST_EQ(vb2_load_kernel_keyblock(ctx),
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VB2_ERROR_MOCK, "Kernel keyblock dev+rec");
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/* Test keyblock flags matching mode */
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reset_common_data(FOR_KEYBLOCK);
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kb->keyblock_flags &= ~VB2_KEYBLOCK_FLAG_DEVELOPER_0;
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TEST_EQ(vb2_load_kernel_keyblock(ctx),
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VB2_ERROR_KERNEL_KEYBLOCK_DEV_FLAG,
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"Kernel keyblock dev only");
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reset_common_data(FOR_KEYBLOCK);
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kb->keyblock_flags &= ~VB2_KEYBLOCK_FLAG_RECOVERY_0;
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TEST_EQ(vb2_load_kernel_keyblock(ctx),
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VB2_ERROR_KERNEL_KEYBLOCK_REC_FLAG,
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"Kernel keyblock rec only");
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reset_common_data(FOR_KEYBLOCK);
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kb->keyblock_flags &= ~VB2_KEYBLOCK_FLAG_RECOVERY_1;
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ctx->flags |= VB2_CONTEXT_RECOVERY_MODE;
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TEST_EQ(vb2_load_kernel_keyblock(ctx),
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VB2_ERROR_KERNEL_KEYBLOCK_REC_FLAG,
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|
|
"Kernel keyblock not rec");
|
||
|
|
|
||
|
|
reset_common_data(FOR_KEYBLOCK);
|
||
|
|
kb->keyblock_flags &= ~VB2_KEYBLOCK_FLAG_DEVELOPER_0;
|
||
|
|
kb->keyblock_flags &= ~VB2_KEYBLOCK_FLAG_RECOVERY_0;
|
||
|
|
ctx->flags |= VB2_CONTEXT_RECOVERY_MODE;
|
||
|
|
TEST_EQ(vb2_load_kernel_keyblock(ctx),
|
||
|
|
VB2_ERROR_KERNEL_KEYBLOCK_DEV_FLAG,
|
||
|
|
"Kernel keyblock rec but not dev+rec");
|
||
|
|
|
||
|
|
reset_common_data(FOR_KEYBLOCK);
|
||
|
|
kb->keyblock_flags &= ~VB2_KEYBLOCK_FLAG_DEVELOPER_0;
|
||
|
|
kb->keyblock_flags &= ~VB2_KEYBLOCK_FLAG_RECOVERY_0;
|
||
|
|
ctx->flags |= VB2_CONTEXT_DEVELOPER_MODE | VB2_CONTEXT_RECOVERY_MODE;
|
||
|
|
TEST_SUCC(vb2_load_kernel_keyblock(ctx),
|
||
|
|
"Kernel keyblock flags dev+rec");
|
||
|
|
|
||
|
|
/* System in dev mode ignores flags */
|
||
|
|
reset_common_data(FOR_KEYBLOCK);
|
||
|
|
ctx->flags |= VB2_CONTEXT_DEVELOPER_MODE;
|
||
|
|
kb->keyblock_flags = 0;
|
||
|
|
TEST_SUCC(vb2_load_kernel_keyblock(ctx), "Kernel keyblock dev flags");
|
||
|
|
|
||
|
|
/* Test rollback */
|
||
|
|
reset_common_data(FOR_KEYBLOCK);
|
||
|
|
kb->data_key.key_version = 0x10000;
|
||
|
|
TEST_EQ(vb2_load_kernel_keyblock(ctx),
|
||
|
|
VB2_ERROR_KERNEL_KEYBLOCK_VERSION_RANGE,
|
||
|
|
"Kernel keyblock version range");
|
||
|
|
|
||
|
|
reset_common_data(FOR_KEYBLOCK);
|
||
|
|
kb->data_key.key_version = 1;
|
||
|
|
TEST_EQ(vb2_load_kernel_keyblock(ctx),
|
||
|
|
VB2_ERROR_KERNEL_KEYBLOCK_VERSION_ROLLBACK,
|
||
|
|
"Kernel keyblock rollback");
|
||
|
|
|
||
|
|
/* Rollback ok in developer mode */
|
||
|
|
reset_common_data(FOR_KEYBLOCK);
|
||
|
|
kb->data_key.key_version = 1;
|
||
|
|
ctx->flags |= VB2_CONTEXT_DEVELOPER_MODE;
|
||
|
|
TEST_SUCC(vb2_load_kernel_keyblock(ctx),
|
||
|
|
"Kernel keyblock rollback dev");
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Recovery keyblocks aren't versioned (and even if they were, it
|
||
|
|
* wouldn't be with the same version as a normal kernel).
|
||
|
|
*/
|
||
|
|
reset_common_data(FOR_KEYBLOCK);
|
||
|
|
kb->data_key.key_version = 1;
|
||
|
|
ctx->flags |= VB2_CONTEXT_RECOVERY_MODE;
|
||
|
|
TEST_SUCC(vb2_load_kernel_keyblock(ctx),
|
||
|
|
"Kernel keyblock rollback rec");
|
||
|
|
}
|
||
|
|
|
||
|
|
static void load_kernel_preamble_tests(void)
|
||
|
|
{
|
||
|
|
struct vb2_kernel_preamble *pre = &mock_vblock.p.pre;
|
||
|
|
int expected_offset;
|
||
|
|
//uint32_t v;
|
||
|
|
|
||
|
|
/* Test successful call */
|
||
|
|
reset_common_data(FOR_PREAMBLE);
|
||
|
|
expected_offset = sd->workbuf_used;
|
||
|
|
TEST_SUCC(vb2_load_kernel_preamble(ctx), "preamble good");
|
||
|
|
TEST_EQ(sd->kernel_version, 0x20002, "combined version");
|
||
|
|
TEST_EQ(sd->preamble_offset, expected_offset,
|
||
|
|
"preamble offset");
|
||
|
|
TEST_EQ(sd->preamble_size, pre->preamble_size, "preamble size");
|
||
|
|
TEST_EQ(sd->workbuf_used,
|
||
|
|
vb2_wb_round_up(sd->preamble_offset +
|
||
|
|
sd->preamble_size),
|
||
|
|
"workbuf used");
|
||
|
|
|
||
|
|
/* Expected failures */
|
||
|
|
reset_common_data(FOR_PREAMBLE);
|
||
|
|
sd->data_key_size = 0;
|
||
|
|
TEST_EQ(vb2_load_kernel_preamble(ctx),
|
||
|
|
VB2_ERROR_KERNEL_PREAMBLE2_DATA_KEY,
|
||
|
|
"preamble no data key");
|
||
|
|
|
||
|
|
reset_common_data(FOR_PREAMBLE);
|
||
|
|
mock_unpack_key_retval = VB2_ERROR_UNPACK_KEY_HASH_ALGORITHM;
|
||
|
|
TEST_EQ(vb2_load_kernel_preamble(ctx),
|
||
|
|
VB2_ERROR_UNPACK_KEY_HASH_ALGORITHM,
|
||
|
|
"preamble unpack data key");
|
||
|
|
|
||
|
|
reset_common_data(FOR_PREAMBLE);
|
||
|
|
sd->workbuf_used = sd->workbuf_size + VB2_WORKBUF_ALIGN -
|
||
|
|
vb2_wb_round_up(sizeof(struct vb2_kernel_preamble));
|
||
|
|
TEST_EQ(vb2_load_kernel_preamble(ctx),
|
||
|
|
VB2_ERROR_KERNEL_PREAMBLE2_WORKBUF_HEADER,
|
||
|
|
"preamble not enough workbuf for header");
|
||
|
|
|
||
|
|
reset_common_data(FOR_PREAMBLE);
|
||
|
|
sd->vblock_preamble_offset = sizeof(mock_vblock);
|
||
|
|
TEST_EQ(vb2_load_kernel_preamble(ctx),
|
||
|
|
VB2_ERROR_EX_READ_RESOURCE_SIZE,
|
||
|
|
"preamble read header");
|
||
|
|
|
||
|
|
reset_common_data(FOR_PREAMBLE);
|
||
|
|
sd->workbuf_used = sd->workbuf_size + VB2_WORKBUF_ALIGN -
|
||
|
|
vb2_wb_round_up(sizeof(mock_vblock.p));
|
||
|
|
TEST_EQ(vb2_load_kernel_preamble(ctx),
|
||
|
|
VB2_ERROR_KERNEL_PREAMBLE2_WORKBUF,
|
||
|
|
"preamble not enough workbuf");
|
||
|
|
|
||
|
|
reset_common_data(FOR_PREAMBLE);
|
||
|
|
pre->preamble_size = sizeof(mock_vblock);
|
||
|
|
TEST_EQ(vb2_load_kernel_preamble(ctx),
|
||
|
|
VB2_ERROR_EX_READ_RESOURCE_SIZE,
|
||
|
|
"preamble read full");
|
||
|
|
|
||
|
|
reset_common_data(FOR_PREAMBLE);
|
||
|
|
mock_verify_preamble_retval = VB2_ERROR_MOCK;
|
||
|
|
TEST_EQ(vb2_load_kernel_preamble(ctx),
|
||
|
|
VB2_ERROR_MOCK,
|
||
|
|
"preamble verify");
|
||
|
|
|
||
|
|
reset_common_data(FOR_PREAMBLE);
|
||
|
|
pre->kernel_version = 0x10000;
|
||
|
|
TEST_EQ(vb2_load_kernel_preamble(ctx),
|
||
|
|
VB2_ERROR_KERNEL_PREAMBLE_VERSION_RANGE,
|
||
|
|
"preamble version range");
|
||
|
|
|
||
|
|
reset_common_data(FOR_PREAMBLE);
|
||
|
|
pre->kernel_version = 1;
|
||
|
|
TEST_EQ(vb2_load_kernel_preamble(ctx),
|
||
|
|
VB2_ERROR_KERNEL_PREAMBLE_VERSION_ROLLBACK,
|
||
|
|
"preamble version rollback");
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char* argv[])
|
||
|
|
{
|
||
|
|
verify_keyblock_hash_tests();
|
||
|
|
load_kernel_keyblock_tests();
|
||
|
|
load_kernel_preamble_tests();
|
||
|
|
|
||
|
|
return gTestSuccess ? 0 : 255;
|
||
|
|
}
|