| /* Copyright 2015 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| * |
| * Tests for kernel verification library, api layer |
| */ |
| |
| #include <stdio.h> |
| |
| #include "2sysincludes.h" |
| #include "2api.h" |
| #include "2common.h" |
| #include "2misc.h" |
| #include "2nvstorage.h" |
| #include "2rsa.h" |
| #include "2secdata.h" |
| #include "vb2_common.h" |
| #include "test_common.h" |
| |
| /* Common context for tests */ |
| static uint8_t workbuf[VB2_KERNEL_WORKBUF_RECOMMENDED_SIZE] |
| __attribute__ ((aligned (VB2_WORKBUF_ALIGN))); |
| static struct vb2_workbuf wb; |
| static struct vb2_context cc; |
| static struct vb2_shared_data *sd; |
| static struct vb2_fw_preamble *fwpre; |
| static struct vb2_kernel_preamble *kpre; |
| static struct vb2_packed_key *kdkey; |
| static const char fw_kernel_key_data[36] = "Test kernel key data"; |
| static char kernel_data[0x4008] = "Sure it's a kernel..."; |
| |
| /* Mocked function data */ |
| |
| static struct { |
| struct vb2_gbb_header h; |
| struct vb2_packed_key recovery_key; |
| char recovery_key_data[32]; |
| } mock_gbb; |
| |
| static int mock_read_res_fail_on_call; |
| static int mock_unpack_key_retval; |
| static int mock_read_gbb_header_retval; |
| static int mock_load_kernel_keyblock_retval; |
| static int mock_load_kernel_preamble_retval; |
| |
| /* Type of test to reset for */ |
| enum reset_type { |
| FOR_PHASE1, |
| FOR_PHASE2, |
| FOR_PHASE3, |
| }; |
| |
| static void reset_common_data(enum reset_type t) |
| { |
| struct vb2_packed_key *k; |
| |
| memset(workbuf, 0xaa, sizeof(workbuf)); |
| |
| memset(&cc, 0, sizeof(cc)); |
| cc.workbuf = workbuf; |
| cc.workbuf_size = sizeof(workbuf); |
| vb2_workbuf_from_ctx(&cc, &wb); |
| |
| vb2_init_context(&cc); |
| sd = vb2_get_sd(&cc); |
| |
| vb2_nv_init(&cc); |
| |
| vb2_secdatak_create(&cc); |
| vb2_secdatak_init(&cc); |
| vb2_secdatak_set(&cc, VB2_SECDATAK_VERSIONS, 0x20002); |
| |
| mock_read_res_fail_on_call = 0; |
| mock_unpack_key_retval = VB2_SUCCESS; |
| mock_read_gbb_header_retval = VB2_SUCCESS; |
| mock_load_kernel_keyblock_retval = VB2_SUCCESS; |
| mock_load_kernel_preamble_retval = VB2_SUCCESS; |
| |
| /* Recovery key in mock GBB */ |
| mock_gbb.recovery_key.algorithm = 11; |
| mock_gbb.recovery_key.key_offset = |
| vb2_offset_of(&mock_gbb.recovery_key, |
| &mock_gbb.recovery_key_data); |
| mock_gbb.recovery_key.key_size = sizeof(mock_gbb.recovery_key_data); |
| strcpy(mock_gbb.recovery_key_data, "The recovery key"); |
| mock_gbb.h.recovery_key_offset = |
| vb2_offset_of(&mock_gbb, &mock_gbb.recovery_key); |
| mock_gbb.h.recovery_key_size = |
| mock_gbb.recovery_key.key_offset + |
| mock_gbb.recovery_key.key_size; |
| |
| if (t == FOR_PHASE1) { |
| uint8_t *kdata; |
| |
| /* Create mock firmware preamble in the context */ |
| sd->workbuf_preamble_offset = cc.workbuf_used; |
| fwpre = (struct vb2_fw_preamble *) |
| (cc.workbuf + sd->workbuf_preamble_offset); |
| k = &fwpre->kernel_subkey; |
| kdata = (uint8_t *)fwpre + sizeof(*fwpre); |
| memcpy(kdata, fw_kernel_key_data, sizeof(fw_kernel_key_data)); |
| k->algorithm = 7; |
| k->key_offset = vb2_offset_of(k, kdata); |
| k->key_size = sizeof(fw_kernel_key_data); |
| sd->workbuf_preamble_size = sizeof(*fwpre) + k->key_size; |
| cc.workbuf_used += sd->workbuf_preamble_size; |
| |
| } else if (t == FOR_PHASE2) { |
| struct vb2_signature *sig; |
| struct vb2_digest_context dc; |
| uint8_t *sdata; |
| |
| /* Create mock kernel data key */ |
| sd->workbuf_data_key_offset = cc.workbuf_used; |
| kdkey = (struct vb2_packed_key *) |
| (cc.workbuf + sd->workbuf_data_key_offset); |
| kdkey->algorithm = VB2_ALG_RSA2048_SHA256; |
| sd->workbuf_data_key_size = sizeof(*kdkey); |
| cc.workbuf_used += sd->workbuf_data_key_size; |
| |
| /* Create mock kernel preamble in the context */ |
| sd->workbuf_preamble_offset = cc.workbuf_used; |
| kpre = (struct vb2_kernel_preamble *) |
| (cc.workbuf + sd->workbuf_preamble_offset); |
| sdata = (uint8_t *)kpre + sizeof(*kpre); |
| |
| sig = &kpre->body_signature; |
| sig->data_size = sizeof(kernel_data); |
| sig->sig_offset = vb2_offset_of(sig, sdata); |
| sig->sig_size = VB2_SHA512_DIGEST_SIZE; |
| |
| vb2_digest_init(&dc, VB2_HASH_SHA256); |
| vb2_digest_extend(&dc, (const uint8_t *)kernel_data, |
| sizeof(kernel_data)); |
| vb2_digest_finalize(&dc, sdata, sig->sig_size); |
| |
| sd->workbuf_preamble_size = sizeof(*kpre) + sig->sig_size; |
| sd->vblock_preamble_offset = |
| 0x10000 - sd->workbuf_preamble_size; |
| cc.workbuf_used += sd->workbuf_preamble_size; |
| |
| } else { |
| /* Set flags and versions for roll-forward */ |
| sd->kernel_version = 0x20004; |
| sd->kernel_version_secdatak = 0x20002; |
| sd->flags |= VB2_SD_FLAG_KERNEL_SIGNED; |
| cc.flags |= VB2_CONTEXT_ALLOW_KERNEL_ROLL_FORWARD; |
| } |
| }; |
| |
| /* Mocked functions */ |
| |
| int vb2ex_read_resource(struct vb2_context *ctx, |
| enum vb2_resource_index index, |
| uint32_t offset, |
| void *buf, |
| uint32_t size) |
| { |
| uint8_t *rptr; |
| uint32_t rsize; |
| |
| if (--mock_read_res_fail_on_call == 0) |
| return VB2_ERROR_MOCK; |
| |
| switch(index) { |
| case VB2_RES_GBB: |
| rptr = (uint8_t *)&mock_gbb; |
| rsize = sizeof(mock_gbb); |
| break; |
| default: |
| return VB2_ERROR_EX_READ_RESOURCE_INDEX; |
| } |
| |
| if (offset > rsize || offset + size > rsize) |
| return VB2_ERROR_EX_READ_RESOURCE_SIZE; |
| |
| memcpy(buf, rptr + offset, size); |
| return VB2_SUCCESS; |
| } |
| |
| int vb2_read_gbb_header(struct vb2_context *ctx, struct vb2_gbb_header *gbb) |
| { |
| memcpy(gbb, &mock_gbb.h, sizeof(*gbb)); |
| return mock_read_gbb_header_retval; |
| } |
| |
| int vb2_load_kernel_keyblock(struct vb2_context *ctx) |
| { |
| return mock_load_kernel_keyblock_retval; |
| } |
| |
| int vb2_load_kernel_preamble(struct vb2_context *ctx) |
| { |
| return mock_load_kernel_preamble_retval; |
| } |
| |
| int vb2_unpack_key_buffer(struct vb2_public_key *key, |
| const uint8_t *buf, |
| uint32_t size) |
| { |
| const struct vb2_packed_key *k = (const struct vb2_packed_key *)buf; |
| |
| key->arrsize = 0; |
| key->hash_alg = vb2_crypto_to_hash(k->algorithm); |
| return mock_unpack_key_retval; |
| } |
| |
| int vb2_verify_digest(const struct vb2_public_key *key, |
| struct vb2_signature *sig, |
| const uint8_t *digest, |
| const struct vb2_workbuf *wb) |
| { |
| if (memcmp(digest, (uint8_t *)sig + sig->sig_offset, sig->sig_size)) |
| return VB2_ERROR_VDATA_VERIFY_DIGEST; |
| |
| return VB2_SUCCESS; |
| } |
| |
| /* Tests */ |
| |
| static void phase1_tests(void) |
| { |
| struct vb2_packed_key *k; |
| uint32_t old_preamble_offset; |
| |
| /* Test successful call */ |
| reset_common_data(FOR_PHASE1); |
| old_preamble_offset = sd->workbuf_preamble_offset; |
| TEST_SUCC(vb2api_kernel_phase1(&cc), "phase1 good"); |
| TEST_EQ(sd->workbuf_preamble_size, 0, " no more fw preamble"); |
| /* Make sure normal key was loaded */ |
| TEST_EQ(sd->workbuf_kernel_key_offset, old_preamble_offset, |
| " workbuf key offset"); |
| k = (struct vb2_packed_key *) |
| (cc.workbuf + sd->workbuf_kernel_key_offset); |
| TEST_EQ(sd->workbuf_kernel_key_size, k->key_offset + k->key_size, |
| " workbuf key size"); |
| TEST_EQ(cc.workbuf_used, sd->workbuf_kernel_key_offset + |
| sd->workbuf_kernel_key_size, " workbuf used"); |
| TEST_EQ(k->algorithm, 7, " key algorithm"); |
| TEST_EQ(k->key_size, sizeof(fw_kernel_key_data), " key_size"); |
| TEST_EQ(memcmp((uint8_t *)k + k->key_offset, fw_kernel_key_data, |
| k->key_size), 0, " key data"); |
| TEST_EQ(sd->kernel_version_secdatak, 0x20002, " secdatak version"); |
| |
| /* Test successful call in recovery mode */ |
| reset_common_data(FOR_PHASE1); |
| cc.flags |= VB2_CONTEXT_RECOVERY_MODE; |
| /* No preamble loaded in recovery mode */ |
| cc.workbuf_used = old_preamble_offset = sd->workbuf_preamble_offset; |
| sd->workbuf_preamble_offset = sd->workbuf_preamble_size = 0; |
| TEST_SUCC(vb2api_kernel_phase1(&cc), "phase1 rec good"); |
| TEST_EQ(sd->workbuf_preamble_size, 0, "no more fw preamble"); |
| /* Make sure recovery key was loaded */ |
| TEST_EQ(sd->workbuf_kernel_key_offset, old_preamble_offset, |
| " workbuf key offset"); |
| k = (struct vb2_packed_key *) |
| (cc.workbuf + sd->workbuf_kernel_key_offset); |
| TEST_EQ(sd->workbuf_kernel_key_size, k->key_offset + k->key_size, |
| " workbuf key size"); |
| TEST_EQ(cc.workbuf_used, sd->workbuf_kernel_key_offset + |
| sd->workbuf_kernel_key_size, " workbuf used"); |
| TEST_EQ(k->algorithm, 11, " key algorithm"); |
| TEST_EQ(k->key_size, sizeof(mock_gbb.recovery_key_data), " key_size"); |
| TEST_EQ(memcmp((uint8_t *)k + k->key_offset, |
| mock_gbb.recovery_key_data, k->key_size), 0, |
| " key data"); |
| TEST_EQ(sd->kernel_version_secdatak, 0x20002, " secdatak version"); |
| |
| /* Bad secdatak causes failure in normal mode only */ |
| reset_common_data(FOR_PHASE1); |
| cc.secdatak[0] ^= 0x33; |
| TEST_EQ(vb2api_kernel_phase1(&cc), VB2_ERROR_SECDATAK_CRC, |
| "phase1 bad secdata"); |
| reset_common_data(FOR_PHASE1); |
| |
| cc.secdatak[0] ^= 0x33; |
| cc.flags |= VB2_CONTEXT_RECOVERY_MODE; |
| TEST_SUCC(vb2api_kernel_phase1(&cc), "phase1 bad secdata rec"); |
| TEST_EQ(sd->kernel_version_secdatak, 0, " secdatak version"); |
| |
| /* Failures while reading recovery key */ |
| reset_common_data(FOR_PHASE1); |
| cc.flags |= VB2_CONTEXT_RECOVERY_MODE; |
| cc.workbuf_used = cc.workbuf_size - sizeof(struct vb2_gbb_header) + 1; |
| TEST_EQ(vb2api_kernel_phase1(&cc), VB2_ERROR_GBB_WORKBUF, |
| "phase1 rec workbuf gbb header"); |
| |
| reset_common_data(FOR_PHASE1); |
| cc.flags |= VB2_CONTEXT_RECOVERY_MODE; |
| mock_read_gbb_header_retval = VB2_ERROR_MOCK; |
| TEST_EQ(vb2api_kernel_phase1(&cc), VB2_ERROR_MOCK, |
| "phase1 rec gbb read header"); |
| |
| reset_common_data(FOR_PHASE1); |
| cc.flags |= VB2_CONTEXT_RECOVERY_MODE; |
| mock_gbb.h.recovery_key_size = cc.workbuf_size - 1; |
| TEST_EQ(vb2api_kernel_phase1(&cc), VB2_ERROR_API_KPHASE1_WORKBUF_REC_KEY, |
| "phase1 rec workbuf key"); |
| |
| reset_common_data(FOR_PHASE1); |
| cc.flags |= VB2_CONTEXT_RECOVERY_MODE; |
| mock_read_res_fail_on_call = 1; |
| TEST_EQ(vb2api_kernel_phase1(&cc), VB2_ERROR_MOCK, |
| "phase1 rec gbb read key"); |
| |
| /* Failures while parsing subkey from firmware preamble */ |
| reset_common_data(FOR_PHASE1); |
| sd->workbuf_preamble_size = 0; |
| TEST_EQ(vb2api_kernel_phase1(&cc), VB2_ERROR_API_KPHASE1_PREAMBLE, |
| "phase1 fw preamble"); |
| } |
| |
| static void load_kernel_vblock_tests(void) |
| { |
| reset_common_data(FOR_PHASE1); |
| TEST_SUCC(vb2api_load_kernel_vblock(&cc), "load vblock good"); |
| |
| reset_common_data(FOR_PHASE1); |
| mock_load_kernel_keyblock_retval = VB2_ERROR_MOCK; |
| TEST_EQ(vb2api_load_kernel_vblock(&cc), VB2_ERROR_MOCK, |
| "load vblock bad keyblock"); |
| |
| reset_common_data(FOR_PHASE1); |
| mock_load_kernel_preamble_retval = VB2_ERROR_MOCK; |
| TEST_EQ(vb2api_load_kernel_vblock(&cc), VB2_ERROR_MOCK, |
| "load vblock bad preamble"); |
| } |
| |
| static void get_kernel_size_tests(void) |
| { |
| uint32_t offs, size; |
| |
| reset_common_data(FOR_PHASE2); |
| offs = size = 0; |
| TEST_SUCC(vb2api_get_kernel_size(&cc, &offs, &size), "get size good"); |
| TEST_EQ(offs, 0x10000, " offset"); |
| TEST_EQ(size, sizeof(kernel_data), " size"); |
| |
| /* Don't need to pass pointers */ |
| reset_common_data(FOR_PHASE2); |
| TEST_SUCC(vb2api_get_kernel_size(&cc, NULL, NULL), "get size null"); |
| |
| reset_common_data(FOR_PHASE2); |
| sd->workbuf_preamble_size = 0; |
| TEST_EQ(vb2api_get_kernel_size(&cc, &offs, &size), |
| VB2_ERROR_API_GET_KERNEL_SIZE_PREAMBLE, |
| "get size no preamble"); |
| } |
| |
| static void verify_kernel_data_tests(void) |
| { |
| reset_common_data(FOR_PHASE2); |
| TEST_SUCC(vb2api_verify_kernel_data(&cc, kernel_data, sizeof(kernel_data)), |
| "verify data good"); |
| |
| reset_common_data(FOR_PHASE2); |
| sd->workbuf_preamble_size = 0; |
| TEST_EQ(vb2api_verify_kernel_data(&cc, kernel_data, sizeof(kernel_data)), |
| VB2_ERROR_API_VERIFY_KDATA_PREAMBLE, "verify no preamble"); |
| |
| reset_common_data(FOR_PHASE2); |
| TEST_EQ(vb2api_verify_kernel_data(&cc, kernel_data, sizeof(kernel_data) + 1), |
| VB2_ERROR_API_VERIFY_KDATA_SIZE, "verify size"); |
| |
| reset_common_data(FOR_PHASE2); |
| cc.workbuf_used = cc.workbuf_size - sizeof(struct vb2_digest_context) + 1; |
| TEST_EQ(vb2api_verify_kernel_data(&cc, kernel_data, sizeof(kernel_data)), |
| VB2_ERROR_API_VERIFY_KDATA_WORKBUF, "verify workbuf"); |
| |
| reset_common_data(FOR_PHASE2); |
| sd->workbuf_data_key_size = 0; |
| TEST_EQ(vb2api_verify_kernel_data(&cc, kernel_data, sizeof(kernel_data)), |
| VB2_ERROR_API_VERIFY_KDATA_KEY, "verify no key"); |
| |
| reset_common_data(FOR_PHASE2); |
| mock_unpack_key_retval = VB2_ERROR_MOCK; |
| TEST_EQ(vb2api_verify_kernel_data(&cc, kernel_data, sizeof(kernel_data)), |
| VB2_ERROR_MOCK, "verify unpack key"); |
| |
| reset_common_data(FOR_PHASE2); |
| kdkey->algorithm = VB2_ALG_COUNT; |
| TEST_EQ(vb2api_verify_kernel_data(&cc, kernel_data, sizeof(kernel_data)), |
| VB2_ERROR_SHA_INIT_ALGORITHM, "verify hash init"); |
| |
| reset_common_data(FOR_PHASE2); |
| cc.workbuf_used = cc.workbuf_size - sizeof(struct vb2_digest_context) - 4; |
| TEST_EQ(vb2api_verify_kernel_data(&cc, kernel_data, sizeof(kernel_data)), |
| VB2_ERROR_API_CHECK_HASH_WORKBUF_DIGEST, "verify hash workbuf"); |
| |
| reset_common_data(FOR_PHASE2); |
| kernel_data[3] ^= 0xd0; |
| TEST_EQ(vb2api_verify_kernel_data(&cc, kernel_data, sizeof(kernel_data)), |
| VB2_ERROR_VDATA_VERIFY_DIGEST, "verify hash digest"); |
| kernel_data[3] ^= 0xd0; |
| } |
| |
| static void phase3_tests(void) |
| { |
| uint32_t v; |
| |
| reset_common_data(FOR_PHASE3); |
| TEST_SUCC(vb2api_kernel_phase3(&cc), "phase3 good"); |
| vb2_secdatak_get(&cc, VB2_SECDATAK_VERSIONS, &v); |
| TEST_EQ(v, 0x20004, " version"); |
| |
| reset_common_data(FOR_PHASE3); |
| sd->kernel_version = 0x20001; |
| TEST_SUCC(vb2api_kernel_phase3(&cc), "phase3 no rollback"); |
| vb2_secdatak_get(&cc, VB2_SECDATAK_VERSIONS, &v); |
| TEST_EQ(v, 0x20002, " version"); |
| |
| reset_common_data(FOR_PHASE3); |
| sd->flags &= ~VB2_SD_FLAG_KERNEL_SIGNED; |
| TEST_SUCC(vb2api_kernel_phase3(&cc), "phase3 unsigned kernel"); |
| vb2_secdatak_get(&cc, VB2_SECDATAK_VERSIONS, &v); |
| TEST_EQ(v, 0x20002, " version"); |
| |
| reset_common_data(FOR_PHASE3); |
| cc.flags |= VB2_CONTEXT_RECOVERY_MODE; |
| TEST_SUCC(vb2api_kernel_phase3(&cc), "phase3 recovery"); |
| vb2_secdatak_get(&cc, VB2_SECDATAK_VERSIONS, &v); |
| TEST_EQ(v, 0x20002, " version"); |
| |
| reset_common_data(FOR_PHASE3); |
| cc.flags &= ~VB2_CONTEXT_ALLOW_KERNEL_ROLL_FORWARD; |
| TEST_SUCC(vb2api_kernel_phase3(&cc), "phase3 no rollforward"); |
| vb2_secdatak_get(&cc, VB2_SECDATAK_VERSIONS, &v); |
| TEST_EQ(v, 0x20002, " version"); |
| |
| reset_common_data(FOR_PHASE3); |
| sd->status &= ~VB2_SD_STATUS_SECDATAK_INIT; |
| TEST_EQ(vb2api_kernel_phase3(&cc), |
| VB2_ERROR_SECDATAK_SET_UNINITIALIZED, "phase3 set fail"); |
| } |
| |
| int main(int argc, char* argv[]) |
| { |
| phase1_tests(); |
| load_kernel_vblock_tests(); |
| get_kernel_size_tests(); |
| verify_kernel_data_tests(); |
| phase3_tests(); |
| |
| return gTestSuccess ? 0 : 255; |
| } |