static void test_verify_fw_preamble(const VbPublicKey *public_key, const VbPrivateKey *private_key, const VbPublicKey *kernel_subkey) { struct vb2_fw_preamble *hdr; struct vb2_fw_preamble *h; struct vb2_public_key rsa; uint8_t workbuf[VB2_VERIFY_FIRMWARE_PREAMBLE_WORKBUF_BYTES] __attribute__ ((aligned (VB2_WORKBUF_ALIGN))); struct vb2_workbuf wb; uint32_t hsize; vb2_workbuf_init(&wb, workbuf, sizeof(workbuf)); /* Create a dummy signature */ VbSignature *body_sig = SignatureAlloc(56, 78); TEST_SUCC(vb2_unpack_key(&rsa, (uint8_t *)public_key, public_key->key_offset + public_key->key_size), "vb2_verify_fw_preamble() prereq key"); hdr = (struct vb2_fw_preamble *) CreateFirmwarePreamble(0x1234, kernel_subkey, body_sig, private_key, 0x5678); TEST_PTR_NEQ(hdr, NULL, "VerifyFirmwarePreamble() prereq test preamble"); if (!hdr) return; hsize = (uint32_t) hdr->preamble_size; h = (struct vb2_fw_preamble *)malloc(hsize + 16384); Memcpy(h, hdr, hsize); TEST_SUCC(vb2_verify_fw_preamble(h, hsize, &rsa, &wb), "vb2_verify_fw_preamble() ok using key"); Memcpy(h, hdr, hsize); TEST_EQ(vb2_verify_fw_preamble(h, 4, &rsa, &wb), VB2_ERROR_PREAMBLE_TOO_SMALL_FOR_HEADER, "vb2_verify_fw_preamble() size tiny"); Memcpy(h, hdr, hsize); TEST_EQ(vb2_verify_fw_preamble(h, hsize - 1, &rsa, &wb), VB2_ERROR_PREAMBLE_SIZE, "vb2_verify_fw_preamble() size--"); /* Buffer is allowed to be bigger than preamble */ Memcpy(h, hdr, hsize); TEST_SUCC(vb2_verify_fw_preamble(h, hsize + 1, &rsa, &wb), "vb2_verify_fw_preamble() size++"); /* Care about major version but not minor */ Memcpy(h, hdr, hsize); h->header_version_major++; resign_fw_preamble(h, private_key); TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_HEADER_VERSION , "vb2_verify_fw_preamble() major++"); Memcpy(h, hdr, hsize); h->header_version_major--; resign_fw_preamble(h, private_key); TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_HEADER_VERSION, "vb2_verify_fw_preamble() major--"); Memcpy(h, hdr, hsize); h->header_version_minor++; resign_fw_preamble(h, private_key); TEST_SUCC(vb2_verify_fw_preamble(h, hsize, &rsa, &wb), "vb2_verify_fw_preamble() minor++"); Memcpy(h, hdr, hsize); h->header_version_minor--; resign_fw_preamble(h, private_key); TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_HEADER_OLD, "vb2_verify_fw_preamble() 2.0 not supported"); /* Check signature */ Memcpy(h, hdr, hsize); h->preamble_signature.sig_offset = hsize; resign_fw_preamble(h, private_key); TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_SIG_OUTSIDE, "vb2_verify_fw_preamble() sig off end"); Memcpy(h, hdr, hsize); h->preamble_signature.sig_size--; resign_fw_preamble(h, private_key); TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_SIG_INVALID, "vb2_verify_fw_preamble() sig too small"); Memcpy(h, hdr, hsize); ((uint8_t *)vb2_packed_key_data(&h->kernel_subkey))[0] ^= 0x34; TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_SIG_INVALID, "vb2_verify_fw_preamble() sig mismatch"); /* Check that we signed header, kernel subkey, and body sig */ Memcpy(h, hdr, hsize); h->preamble_signature.data_size = 4; h->kernel_subkey.key_offset = 0; h->kernel_subkey.key_size = 0; h->body_signature.sig_offset = 0; h->body_signature.sig_size = 0; resign_fw_preamble(h, private_key); TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_SIGNED_TOO_LITTLE, "vb2_verify_fw_preamble() didn't sign header"); Memcpy(h, hdr, hsize); h->kernel_subkey.key_offset = hsize; resign_fw_preamble(h, private_key); TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_KERNEL_SUBKEY_OUTSIDE, "vb2_verify_fw_preamble() kernel subkey off end"); Memcpy(h, hdr, hsize); h->body_signature.sig_offset = hsize; resign_fw_preamble(h, private_key); TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_BODY_SIG_OUTSIDE, "vb2_verify_fw_preamble() body sig off end"); /* TODO: verify with extra padding at end of header. */ free(h); free(hdr); }
static void test_verify_keyblock(const VbPublicKey *public_key, const VbPrivateKey *private_key, const VbPublicKey *data_key) { uint8_t workbuf[VB2_KEY_BLOCK_VERIFY_WORKBUF_BYTES] __attribute__ ((aligned (VB2_WORKBUF_ALIGN))); struct vb2_workbuf wb; struct vb2_public_key key; struct vb2_keyblock *hdr; struct vb2_keyblock *h; uint32_t hsize; vb2_workbuf_init(&wb, workbuf, sizeof(workbuf)); /* Unpack public key */ TEST_SUCC(vb2_unpack_key(&key, (uint8_t *)public_key, public_key->key_offset + public_key->key_size), "vb2_verify_keyblock public key"); hdr = (struct vb2_keyblock *) KeyBlockCreate(data_key, private_key, 0x1234); TEST_NEQ((size_t)hdr, 0, "vb2_verify_keyblock() prerequisites"); if (!hdr) return; hsize = hdr->keyblock_size; h = (struct vb2_keyblock *)malloc(hsize + 2048); Memcpy(h, hdr, hsize); TEST_SUCC(vb2_verify_keyblock(h, hsize, &key, &wb), "vb2_verify_keyblock() ok using key"); Memcpy(h, hdr, hsize); TEST_EQ(vb2_verify_keyblock(h, hsize - 1, &key, &wb), VB2_ERROR_KEYBLOCK_SIZE, "vb2_verify_keyblock() size--"); /* Buffer is allowed to be bigger than keyblock */ Memcpy(h, hdr, hsize); TEST_SUCC(vb2_verify_keyblock(h, hsize + 1, &key, &wb), "vb2_verify_keyblock() size++"); Memcpy(h, hdr, hsize); h->magic[0] &= 0x12; TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb), VB2_ERROR_KEYBLOCK_MAGIC, "vb2_verify_keyblock() magic"); /* Care about major version but not minor */ Memcpy(h, hdr, hsize); h->header_version_major++; resign_keyblock(h, private_key); TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb), VB2_ERROR_KEYBLOCK_HEADER_VERSION, "vb2_verify_keyblock() major++"); Memcpy(h, hdr, hsize); h->header_version_major--; resign_keyblock(h, private_key); TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb), VB2_ERROR_KEYBLOCK_HEADER_VERSION, "vb2_verify_keyblock() major--"); Memcpy(h, hdr, hsize); h->header_version_minor++; resign_keyblock(h, private_key); TEST_SUCC(vb2_verify_keyblock(h, hsize, &key, &wb), "vb2_verify_keyblock() minor++"); Memcpy(h, hdr, hsize); h->header_version_minor--; resign_keyblock(h, private_key); TEST_SUCC(vb2_verify_keyblock(h, hsize, &key, &wb), "vb2_verify_keyblock() minor--"); /* Check signature */ Memcpy(h, hdr, hsize); h->keyblock_signature.sig_offset = hsize; resign_keyblock(h, private_key); TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb), VB2_ERROR_KEYBLOCK_SIG_OUTSIDE, "vb2_verify_keyblock() sig off end"); Memcpy(h, hdr, hsize); h->keyblock_signature.sig_size--; resign_keyblock(h, private_key); TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb), VB2_ERROR_KEYBLOCK_SIG_INVALID, "vb2_verify_keyblock() sig too small"); Memcpy(h, hdr, hsize); ((uint8_t *)vb2_packed_key_data(&h->data_key))[0] ^= 0x34; TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb), VB2_ERROR_KEYBLOCK_SIG_INVALID, "vb2_verify_keyblock() sig mismatch"); Memcpy(h, hdr, hsize); h->keyblock_signature.data_size = h->keyblock_size + 1; TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb), VB2_ERROR_KEYBLOCK_SIGNED_TOO_MUCH, "vb2_verify_keyblock() sig data past end of block"); /* Check that we signed header and data key */ Memcpy(h, hdr, hsize); h->keyblock_signature.data_size = 4; h->data_key.key_offset = 0; h->data_key.key_size = 0; resign_keyblock(h, private_key); TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb), VB2_ERROR_KEYBLOCK_SIGNED_TOO_LITTLE, "vb2_verify_keyblock() didn't sign header"); Memcpy(h, hdr, hsize); h->data_key.key_offset = hsize; resign_keyblock(h, private_key); TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb), VB2_ERROR_KEYBLOCK_DATA_KEY_OUTSIDE, "vb2_verify_keyblock() data key off end"); /* Corner cases for error checking */ TEST_EQ(vb2_verify_keyblock(NULL, 4, &key, &wb), VB2_ERROR_KEYBLOCK_TOO_SMALL_FOR_HEADER, "vb2_verify_keyblock size too small"); /* * TODO: verify parser can support a bigger header (i.e., one where * data_key.key_offset is bigger than expected). */ free(h); free(hdr); }
static void test_verify_kernel_preamble( const struct vb2_packed_key *public_key, const struct vb2_private_key *private_key) { struct vb2_public_key rsa; // TODO: how many workbuf bytes? uint8_t workbuf[VB2_VERIFY_FIRMWARE_PREAMBLE_WORKBUF_BYTES] __attribute__ ((aligned (VB2_WORKBUF_ALIGN))); struct vb2_workbuf wb; uint32_t hsize; vb2_workbuf_init(&wb, workbuf, sizeof(workbuf)); /* Create a dummy signature */ struct vb2_signature *body_sig = vb2_alloc_signature(56, 0x214000); TEST_SUCC(vb2_unpack_key(&rsa, public_key), "vb2_verify_kernel_preamble() prereq key"); struct vb2_kernel_preamble *hdr = vb2_create_kernel_preamble(0x1234, 0x100000, 0x300000, 0x4000, body_sig, 0x304000, 0x10000, 0, 0, private_key); TEST_PTR_NEQ(hdr, NULL, "vb2_verify_kernel_preamble() prereq test preamble"); if (!hdr) { free(body_sig); return; } hsize = (uint32_t) hdr->preamble_size; struct vb2_kernel_preamble *h = (struct vb2_kernel_preamble *)malloc(hsize + 16384); memcpy(h, hdr, hsize); TEST_SUCC(vb2_verify_kernel_preamble(h, hsize, &rsa, &wb), "vb2_verify_kernel_preamble() ok using key"); memcpy(h, hdr, hsize); TEST_EQ(vb2_verify_kernel_preamble(h, 4, &rsa, &wb), VB2_ERROR_PREAMBLE_TOO_SMALL_FOR_HEADER, "vb2_verify_kernel_preamble() size tiny"); memcpy(h, hdr, hsize); TEST_EQ(vb2_verify_kernel_preamble(h, hsize - 1, &rsa, &wb), VB2_ERROR_PREAMBLE_SIZE, "vb2_verify_kernel_preamble() size--"); /* Buffer is allowed to be bigger than preamble */ memcpy(h, hdr, hsize); TEST_SUCC(vb2_verify_kernel_preamble(h, hsize + 1, &rsa, &wb), "vb2_verify_kernel_preamble() size++"); /* Care about major version but not minor */ memcpy(h, hdr, hsize); h->header_version_major++; resign_kernel_preamble(h, private_key); TEST_EQ(vb2_verify_kernel_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_HEADER_VERSION , "vb2_verify_kernel_preamble() major++"); memcpy(h, hdr, hsize); h->header_version_major--; resign_kernel_preamble(h, private_key); TEST_EQ(vb2_verify_kernel_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_HEADER_VERSION, "vb2_verify_kernel_preamble() major--"); memcpy(h, hdr, hsize); h->header_version_minor++; resign_kernel_preamble(h, private_key); TEST_SUCC(vb2_verify_kernel_preamble(h, hsize, &rsa, &wb), "vb2_verify_kernel_preamble() minor++"); /* Check signature */ memcpy(h, hdr, hsize); h->preamble_signature.sig_offset = hsize; resign_kernel_preamble(h, private_key); TEST_EQ(vb2_verify_kernel_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_SIG_OUTSIDE, "vb2_verify_kernel_preamble() sig off end"); memcpy(h, hdr, hsize); h->preamble_signature.sig_size--; resign_kernel_preamble(h, private_key); TEST_EQ(vb2_verify_kernel_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_SIG_INVALID, "vb2_verify_kernel_preamble() sig too small"); memcpy(h, hdr, hsize); h->flags++; TEST_EQ(vb2_verify_kernel_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_SIG_INVALID, "vb2_verify_kernel_preamble() sig mismatch"); /* Check that we signed header and body sig */ memcpy(h, hdr, hsize); h->preamble_signature.data_size = 4; h->body_signature.sig_offset = 0; h->body_signature.sig_size = 0; resign_kernel_preamble(h, private_key); TEST_EQ(vb2_verify_kernel_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_SIGNED_TOO_LITTLE, "vb2_verify_kernel_preamble() didn't sign header"); memcpy(h, hdr, hsize); h->body_signature.sig_offset = hsize; resign_kernel_preamble(h, private_key); TEST_EQ(vb2_verify_kernel_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_BODY_SIG_OUTSIDE, "vb2_verify_kernel_preamble() body sig off end"); /* Check bootloader inside signed body */ memcpy(h, hdr, hsize); h->bootloader_address = h->body_load_address - 1; resign_kernel_preamble(h, private_key); TEST_EQ(vb2_verify_kernel_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_BOOTLOADER_OUTSIDE, "vb2_verify_kernel_preamble() bootloader before body"); memcpy(h, hdr, hsize); h->bootloader_address = h->body_load_address + h->body_signature.data_size + 1; resign_kernel_preamble(h, private_key); TEST_EQ(vb2_verify_kernel_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_BOOTLOADER_OUTSIDE, "vb2_verify_kernel_preamble() bootloader off end of body"); memcpy(h, hdr, hsize); h->bootloader_address = h->body_load_address + h->body_signature.data_size + 1; h->bootloader_size = 0; resign_kernel_preamble(h, private_key); TEST_SUCC(vb2_verify_kernel_preamble(h, hsize, &rsa, &wb), "vb2_verify_kernel_preamble() no bootloader"); /* Check vmlinuz inside signed body */ memcpy(h, hdr, hsize); h->vmlinuz_header_address = h->body_load_address - 1; resign_kernel_preamble(h, private_key); TEST_EQ(vb2_verify_kernel_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_VMLINUZ_HEADER_OUTSIDE, "vb2_verify_kernel_preamble() vmlinuz_header before body"); memcpy(h, hdr, hsize); h->vmlinuz_header_address = h->body_load_address + h->body_signature.data_size + 1; resign_kernel_preamble(h, private_key); TEST_EQ(vb2_verify_kernel_preamble(h, hsize, &rsa, &wb), VB2_ERROR_PREAMBLE_VMLINUZ_HEADER_OUTSIDE, "vb2_verify_kernel_preamble() vmlinuz_header off end of body"); memcpy(h, hdr, hsize); h->vmlinuz_header_address = h->body_load_address + h->body_signature.data_size + 1; h->vmlinuz_header_size = 0; resign_kernel_preamble(h, private_key); TEST_SUCC(vb2_verify_kernel_preamble(h, hsize, &rsa, &wb), "vb2_verify_kernel_preamble() no vmlinuz_header"); /* TODO: verify with extra padding at end of header. */ free(h); free(hdr); free(body_sig); }