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406 lines
12 KiB
406 lines
12 KiB
/* Copyright (c) 2014 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 firmware image library.
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*/
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#include <stdio.h>
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#include "2sysincludes.h"
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#include "2rsa.h"
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#include "file_keys.h"
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#include "host_common.h"
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#include "host_key.h"
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#include "host_keyblock.h"
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#include "host_signature.h"
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#include "vb2_common.h"
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#include "vboot_common.h"
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#include "test_common.h"
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static void resign_keyblock(struct vb2_keyblock *h, const VbPrivateKey *key)
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{
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VbSignature *sig =
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CalculateSignature((const uint8_t *)h,
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h->keyblock_signature.data_size, key);
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SignatureCopy((VbSignature *)&h->keyblock_signature, sig);
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free(sig);
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}
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static void test_verify_keyblock(const VbPublicKey *public_key,
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const VbPrivateKey *private_key,
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const VbPublicKey *data_key)
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{
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uint8_t workbuf[VB2_KEY_BLOCK_VERIFY_WORKBUF_BYTES]
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__attribute__ ((aligned (VB2_WORKBUF_ALIGN)));
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struct vb2_workbuf wb;
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struct vb2_public_key key;
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struct vb2_keyblock *hdr;
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struct vb2_keyblock *h;
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uint32_t hsize;
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vb2_workbuf_init(&wb, workbuf, sizeof(workbuf));
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/* Unpack public key */
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TEST_SUCC(vb2_unpack_key(&key, (uint8_t *)public_key,
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public_key->key_offset + public_key->key_size),
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"vb2_verify_keyblock public key");
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hdr = (struct vb2_keyblock *)
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KeyBlockCreate(data_key, private_key, 0x1234);
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TEST_NEQ((size_t)hdr, 0, "vb2_verify_keyblock() prerequisites");
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if (!hdr)
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return;
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hsize = hdr->keyblock_size;
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h = (struct vb2_keyblock *)malloc(hsize + 2048);
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Memcpy(h, hdr, hsize);
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TEST_SUCC(vb2_verify_keyblock(h, hsize, &key, &wb),
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"vb2_verify_keyblock() ok using key");
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Memcpy(h, hdr, hsize);
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TEST_EQ(vb2_verify_keyblock(h, hsize - 1, &key, &wb),
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VB2_ERROR_KEYBLOCK_SIZE, "vb2_verify_keyblock() size--");
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/* Buffer is allowed to be bigger than keyblock */
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Memcpy(h, hdr, hsize);
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TEST_SUCC(vb2_verify_keyblock(h, hsize + 1, &key, &wb),
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"vb2_verify_keyblock() size++");
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Memcpy(h, hdr, hsize);
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h->magic[0] &= 0x12;
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TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb),
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VB2_ERROR_KEYBLOCK_MAGIC, "vb2_verify_keyblock() magic");
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/* Care about major version but not minor */
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Memcpy(h, hdr, hsize);
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h->header_version_major++;
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resign_keyblock(h, private_key);
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TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb),
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VB2_ERROR_KEYBLOCK_HEADER_VERSION,
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"vb2_verify_keyblock() major++");
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Memcpy(h, hdr, hsize);
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h->header_version_major--;
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resign_keyblock(h, private_key);
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TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb),
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VB2_ERROR_KEYBLOCK_HEADER_VERSION,
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"vb2_verify_keyblock() major--");
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Memcpy(h, hdr, hsize);
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h->header_version_minor++;
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resign_keyblock(h, private_key);
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TEST_SUCC(vb2_verify_keyblock(h, hsize, &key, &wb),
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"vb2_verify_keyblock() minor++");
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Memcpy(h, hdr, hsize);
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h->header_version_minor--;
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resign_keyblock(h, private_key);
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TEST_SUCC(vb2_verify_keyblock(h, hsize, &key, &wb),
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"vb2_verify_keyblock() minor--");
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/* Check signature */
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Memcpy(h, hdr, hsize);
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h->keyblock_signature.sig_offset = hsize;
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resign_keyblock(h, private_key);
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TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb),
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VB2_ERROR_KEYBLOCK_SIG_OUTSIDE,
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"vb2_verify_keyblock() sig off end");
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Memcpy(h, hdr, hsize);
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h->keyblock_signature.sig_size--;
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resign_keyblock(h, private_key);
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TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb),
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VB2_ERROR_KEYBLOCK_SIG_INVALID,
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"vb2_verify_keyblock() sig too small");
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Memcpy(h, hdr, hsize);
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((uint8_t *)vb2_packed_key_data(&h->data_key))[0] ^= 0x34;
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TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb),
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VB2_ERROR_KEYBLOCK_SIG_INVALID,
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"vb2_verify_keyblock() sig mismatch");
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Memcpy(h, hdr, hsize);
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h->keyblock_signature.data_size = h->keyblock_size + 1;
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TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb),
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VB2_ERROR_KEYBLOCK_SIGNED_TOO_MUCH,
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"vb2_verify_keyblock() sig data past end of block");
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/* Check that we signed header and data key */
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Memcpy(h, hdr, hsize);
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h->keyblock_signature.data_size = 4;
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h->data_key.key_offset = 0;
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h->data_key.key_size = 0;
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resign_keyblock(h, private_key);
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TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb),
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VB2_ERROR_KEYBLOCK_SIGNED_TOO_LITTLE,
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"vb2_verify_keyblock() didn't sign header");
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Memcpy(h, hdr, hsize);
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h->data_key.key_offset = hsize;
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resign_keyblock(h, private_key);
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TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb),
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VB2_ERROR_KEYBLOCK_DATA_KEY_OUTSIDE,
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"vb2_verify_keyblock() data key off end");
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/* Corner cases for error checking */
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TEST_EQ(vb2_verify_keyblock(NULL, 4, &key, &wb),
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VB2_ERROR_KEYBLOCK_TOO_SMALL_FOR_HEADER,
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"vb2_verify_keyblock size too small");
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/*
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* TODO: verify parser can support a bigger header (i.e., one where
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* data_key.key_offset is bigger than expected).
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*/
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free(h);
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free(hdr);
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}
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static void resign_fw_preamble(struct vb2_fw_preamble *h,
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const VbPrivateKey *key)
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{
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VbSignature *sig = CalculateSignature(
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(const uint8_t *)h, h->preamble_signature.data_size, key);
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SignatureCopy((VbSignature *)&h->preamble_signature, sig);
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free(sig);
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}
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static void test_verify_fw_preamble(const VbPublicKey *public_key,
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const VbPrivateKey *private_key,
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const VbPublicKey *kernel_subkey)
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{
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struct vb2_fw_preamble *hdr;
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struct vb2_fw_preamble *h;
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struct vb2_public_key rsa;
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uint8_t workbuf[VB2_VERIFY_FIRMWARE_PREAMBLE_WORKBUF_BYTES]
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__attribute__ ((aligned (VB2_WORKBUF_ALIGN)));
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struct vb2_workbuf wb;
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uint32_t hsize;
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vb2_workbuf_init(&wb, workbuf, sizeof(workbuf));
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/* Create a dummy signature */
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VbSignature *body_sig = SignatureAlloc(56, 78);
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TEST_SUCC(vb2_unpack_key(&rsa, (uint8_t *)public_key,
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public_key->key_offset + public_key->key_size),
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"vb2_verify_fw_preamble() prereq key");
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hdr = (struct vb2_fw_preamble *)
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CreateFirmwarePreamble(0x1234, kernel_subkey, body_sig,
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private_key, 0x5678);
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TEST_PTR_NEQ(hdr, NULL,
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"VerifyFirmwarePreamble() prereq test preamble");
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if (!hdr)
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return;
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hsize = (uint32_t) hdr->preamble_size;
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h = (struct vb2_fw_preamble *)malloc(hsize + 16384);
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Memcpy(h, hdr, hsize);
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TEST_SUCC(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
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"vb2_verify_fw_preamble() ok using key");
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Memcpy(h, hdr, hsize);
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TEST_EQ(vb2_verify_fw_preamble(h, 4, &rsa, &wb),
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VB2_ERROR_PREAMBLE_TOO_SMALL_FOR_HEADER,
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"vb2_verify_fw_preamble() size tiny");
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Memcpy(h, hdr, hsize);
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TEST_EQ(vb2_verify_fw_preamble(h, hsize - 1, &rsa, &wb),
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VB2_ERROR_PREAMBLE_SIZE,
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"vb2_verify_fw_preamble() size--");
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/* Buffer is allowed to be bigger than preamble */
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Memcpy(h, hdr, hsize);
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TEST_SUCC(vb2_verify_fw_preamble(h, hsize + 1, &rsa, &wb),
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"vb2_verify_fw_preamble() size++");
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/* Care about major version but not minor */
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Memcpy(h, hdr, hsize);
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h->header_version_major++;
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resign_fw_preamble(h, private_key);
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TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
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VB2_ERROR_PREAMBLE_HEADER_VERSION
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, "vb2_verify_fw_preamble() major++");
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Memcpy(h, hdr, hsize);
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h->header_version_major--;
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resign_fw_preamble(h, private_key);
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TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
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VB2_ERROR_PREAMBLE_HEADER_VERSION,
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"vb2_verify_fw_preamble() major--");
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Memcpy(h, hdr, hsize);
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h->header_version_minor++;
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resign_fw_preamble(h, private_key);
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TEST_SUCC(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
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"vb2_verify_fw_preamble() minor++");
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Memcpy(h, hdr, hsize);
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h->header_version_minor--;
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resign_fw_preamble(h, private_key);
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TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
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VB2_ERROR_PREAMBLE_HEADER_OLD,
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"vb2_verify_fw_preamble() 2.0 not supported");
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/* Check signature */
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Memcpy(h, hdr, hsize);
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h->preamble_signature.sig_offset = hsize;
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resign_fw_preamble(h, private_key);
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TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
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VB2_ERROR_PREAMBLE_SIG_OUTSIDE,
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"vb2_verify_fw_preamble() sig off end");
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Memcpy(h, hdr, hsize);
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h->preamble_signature.sig_size--;
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resign_fw_preamble(h, private_key);
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TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
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VB2_ERROR_PREAMBLE_SIG_INVALID,
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"vb2_verify_fw_preamble() sig too small");
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Memcpy(h, hdr, hsize);
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((uint8_t *)vb2_packed_key_data(&h->kernel_subkey))[0] ^= 0x34;
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TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
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VB2_ERROR_PREAMBLE_SIG_INVALID,
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"vb2_verify_fw_preamble() sig mismatch");
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/* Check that we signed header, kernel subkey, and body sig */
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Memcpy(h, hdr, hsize);
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h->preamble_signature.data_size = 4;
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h->kernel_subkey.key_offset = 0;
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h->kernel_subkey.key_size = 0;
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h->body_signature.sig_offset = 0;
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h->body_signature.sig_size = 0;
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resign_fw_preamble(h, private_key);
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TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
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VB2_ERROR_PREAMBLE_SIGNED_TOO_LITTLE,
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"vb2_verify_fw_preamble() didn't sign header");
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Memcpy(h, hdr, hsize);
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h->kernel_subkey.key_offset = hsize;
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resign_fw_preamble(h, private_key);
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TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
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VB2_ERROR_PREAMBLE_KERNEL_SUBKEY_OUTSIDE,
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"vb2_verify_fw_preamble() kernel subkey off end");
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Memcpy(h, hdr, hsize);
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h->body_signature.sig_offset = hsize;
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resign_fw_preamble(h, private_key);
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TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
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VB2_ERROR_PREAMBLE_BODY_SIG_OUTSIDE,
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"vb2_verify_fw_preamble() body sig off end");
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/* TODO: verify with extra padding at end of header. */
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free(h);
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free(hdr);
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}
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int test_permutation(int signing_key_algorithm, int data_key_algorithm,
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const char *keys_dir)
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{
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char filename[1024];
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int signing_rsa_len = siglen_map[signing_key_algorithm] * 8;
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int data_rsa_len = siglen_map[data_key_algorithm] * 8;
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VbPrivateKey *signing_private_key = NULL;
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VbPublicKey *signing_public_key = NULL;
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VbPublicKey *data_public_key = NULL;
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printf("***Testing signing algorithm: %s\n",
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algo_strings[signing_key_algorithm]);
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printf("***With data key algorithm: %s\n",
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algo_strings[data_key_algorithm]);
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sprintf(filename, "%s/key_rsa%d.pem", keys_dir, signing_rsa_len);
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signing_private_key = PrivateKeyReadPem(filename,
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signing_key_algorithm);
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if (!signing_private_key) {
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fprintf(stderr, "Error reading signing_private_key: %s\n",
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filename);
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return 1;
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}
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sprintf(filename, "%s/key_rsa%d.keyb", keys_dir, signing_rsa_len);
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signing_public_key = PublicKeyReadKeyb(filename,
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signing_key_algorithm, 1);
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if (!signing_public_key) {
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fprintf(stderr, "Error reading signing_public_key: %s\n",
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filename);
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return 1;
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}
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sprintf(filename, "%s/key_rsa%d.keyb", keys_dir, data_rsa_len);
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data_public_key = PublicKeyReadKeyb(filename,
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data_key_algorithm, 1);
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if (!data_public_key) {
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fprintf(stderr, "Error reading data_public_key: %s\n",
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filename);
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return 1;
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}
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test_verify_keyblock(signing_public_key, signing_private_key,
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data_public_key);
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test_verify_fw_preamble(signing_public_key, signing_private_key,
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data_public_key);
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if (signing_public_key)
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free(signing_public_key);
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if (signing_private_key)
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free(signing_private_key);
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if (data_public_key)
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free(data_public_key);
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return 0;
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}
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struct test_perm
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{
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int signing_algorithm;
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int data_key_algorithm;
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};
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/* Permutations of signing and data key algorithms in active use */
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const struct test_perm test_perms[] = {
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{VB2_ALG_RSA4096_SHA256, VB2_ALG_RSA2048_SHA256},
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{VB2_ALG_RSA8192_SHA512, VB2_ALG_RSA2048_SHA256},
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{VB2_ALG_RSA8192_SHA512, VB2_ALG_RSA4096_SHA256},
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};
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int main(int argc, char *argv[])
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{
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if (argc == 2) {
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/* Test only the algorithms we use */
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int i;
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for (i = 0; i < ARRAY_SIZE(test_perms); i++) {
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if (test_permutation(test_perms[i].signing_algorithm,
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test_perms[i].data_key_algorithm,
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argv[1]))
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return 1;
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}
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} else if (argc == 3 && !strcasecmp(argv[2], "--all")) {
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/* Test all the algorithms */
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int sign_alg, data_alg;
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for (sign_alg = 0; sign_alg < VB2_ALG_COUNT; sign_alg++) {
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for (data_alg = 0; data_alg < VB2_ALG_COUNT;
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data_alg++) {
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if (test_permutation(sign_alg, data_alg,
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argv[1]))
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return 1;
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}
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}
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} else {
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fprintf(stderr, "Usage: %s <keys_dir> [--all]", argv[0]);
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return -1;
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}
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return gTestSuccess ? 0 : 255;
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}
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