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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* cryptsetup LUKS2 custom mutator fuzz target
*
* Copyright (C) 2022-2024 Daniel Zatovic <daniel.zatovic@gmail.com>
* Copyright (C) 2022-2024 Red Hat, Inc. All rights reserved.
*/
#include "plain_json_proto_to_luks2_converter.h"
#include "json_proto_converter.h"
extern "C" {
#include "src/cryptsetup.h"
#include "luks2/luks2.h"
#include <err.h>
}
namespace json_proto {
void LUKS2ProtoConverter::emit_luks2_binary_header(const LUKS2_header &header_proto, int fd, uint64_t offset, uint64_t seqid, const std::string &json_text) {
struct luks2_hdr_disk hdr = {};
size_t hdr_json_area_len, write_size;
uint8_t csum[LUKS2_CHECKSUM_L];
int r;
if (hd)
crypt_hash_destroy(hd);
if (crypt_hash_init(&hd, "sha256"))
err(EXIT_FAILURE, "crypt_hash_init failed");
r = lseek(fd, offset, SEEK_SET);
if (r == -1)
err(EXIT_FAILURE, "lseek failed");
switch (header_proto.magic()) {
case INVALID:
memset(&hdr.magic, 0, LUKS2_MAGIC_L);
break;
case FIRST:
memcpy(&hdr.magic, LUKS2_MAGIC_1ST, LUKS2_MAGIC_L);
break;
case SECOND:
memcpy(&hdr.magic, LUKS2_MAGIC_2ND, LUKS2_MAGIC_L);
break;
}
hdr.version = cpu_to_be16(header_proto.version());
hdr.hdr_size = cpu_to_be64(header_proto.hdr_size());
hdr.seqid = cpu_to_be64(seqid);
strncpy(hdr.checksum_alg, "sha256", LUKS2_CHECKSUM_ALG_L);
hdr.checksum_alg[LUKS2_CHECKSUM_ALG_L - 1] = '\0';
strncpy(hdr.uuid, "af7f64ea-3233-4581-946b-6187d812841e", LUKS2_UUID_L);
memset(hdr.salt, 1, LUKS2_SALT_L);
if (header_proto.has_selected_offset())
hdr.hdr_offset = cpu_to_be64(header_proto.selected_offset());
else
hdr.hdr_offset = cpu_to_be64(offset);
if (write_buffer(fd, &hdr, LUKS2_HDR_BIN_LEN) != LUKS2_HDR_BIN_LEN)
err(EXIT_FAILURE, "write_buffer failed");
if (crypt_hash_write(hd, (char*)&hdr, LUKS2_HDR_BIN_LEN))
err(EXIT_FAILURE, "crypt_hash_write failed");
if (header_proto.hdr_size() <= LUKS2_HDR_BIN_LEN ||
header_proto.hdr_size() > LUKS2_DEFAULT_HDR_SIZE)
hdr_json_area_len = LUKS2_DEFAULT_HDR_SIZE - LUKS2_HDR_BIN_LEN;
else
hdr_json_area_len = header_proto.hdr_size() - LUKS2_HDR_BIN_LEN;
write_size = json_text.length() > hdr_json_area_len - 1 ? hdr_json_area_len - 1 : json_text.length();
if (write_buffer(fd, json_text.c_str(), write_size) != (ssize_t)write_size)
err(EXIT_FAILURE, "write_buffer failed");
if (crypt_hash_write(hd, json_text.c_str(), write_size))
err(EXIT_FAILURE, "crypt_hash_write failed");
for (size_t i = 0; i < (hdr_json_area_len - write_size); i++) {
if (crypt_hash_write(hd, "\0", 1))
err(EXIT_FAILURE, "crypt_hash_write failed");
}
if (header_proto.use_correct_checksum()) {
if (lseek(fd, offset + offsetof(luks2_hdr_disk, csum), SEEK_SET) == -1)
err(EXIT_FAILURE, "lseek failed");
int hash_size = crypt_hash_size("sha256");
if (hash_size <= 0)
err(EXIT_FAILURE, "crypt_hash_size failed");
if (crypt_hash_final(hd, (char*)csum, (size_t)hash_size))
err(EXIT_FAILURE, "crypt_hash_final failed");
if (write_buffer(fd, csum, hash_size) != hash_size)
err(EXIT_FAILURE, "write_buffer failed");
}
}
void LUKS2ProtoConverter::set_write_headers_only(bool headers_only) {
write_headers_only = headers_only;
}
void LUKS2ProtoConverter::convert(const LUKS2_both_headers &headers, int fd) {
uint64_t primary_seqid, secondary_seqid;
int result;
size_t out_size = headers.primary_header().hdr_size() + headers.secondary_header().hdr_size();
if (out_size < 4096 || out_size > 2 * LUKS2_DEFAULT_HDR_SIZE)
out_size = LUKS2_DEFAULT_HDR_SIZE;
if (!write_headers_only)
out_size += KEYSLOTS_SIZE + DATA_SIZE;
result = ftruncate(fd, out_size);
if (result == -1)
err(EXIT_FAILURE, "truncate failed");
result = lseek(fd, 0, SEEK_SET);
if (result == -1)
err(EXIT_FAILURE, "lseek failed");
switch (headers.seqid()) {
case EQUAL:
primary_seqid = 1;
secondary_seqid = 1;
break;
case PRIMARY_GREATER:
primary_seqid = 2;
secondary_seqid = 1;
break;
case SECONDARY_GREATER:
primary_seqid = 1;
secondary_seqid = 2;
break;
}
JsonProtoConverter converter;
std::string json_text = converter.Convert(headers.json_area());
emit_luks2_binary_header(headers.primary_header(), fd, 0, primary_seqid, json_text);
emit_luks2_binary_header(headers.secondary_header(), fd, headers.primary_header().hdr_size(), secondary_seqid, json_text);
}
LUKS2ProtoConverter::~LUKS2ProtoConverter() {
if (hd)
crypt_hash_destroy(hd);
}
} // namespace LUKS2_proto
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