--- /dev/null
+/*
+ * veritysetup - setup cryptographic volumes for dm-verity
+ *
+ * Copyright (C) 2012, Red Hat, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#define _FILE_OFFSET_BITS 64
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/mount.h>
+#include <arpa/inet.h>
+#include <popt.h>
+
+#include "crypto_backend.h"
+
+#define DEFAULT_BLOCK_SIZE 4096
+#define DM_VERITY_MAX_LEVELS 63
+
+#define DEFAULT_SALT_SIZE 32
+#define MAX_SALT_SIZE 384
+
+#define MODE_VERIFY 0
+#define MODE_CREATE 1
+#define MODE_ACTIVATE 2
+
+#define MAX_FORMAT_VERSION 1
+
+static int mode = -1;
+static int use_superblock = 1;
+
+static const char *dm_device;
+static const char *data_device;
+static const char *hash_device;
+static const char *hash_algorithm = NULL;
+static const char *root_hash;
+
+static int version = -1;
+static int data_block_size = 0;
+static int hash_block_size = 0;
+static char *data_blocks_string = NULL;
+static long long data_blocks = 0;
+static char *hash_start_string = NULL;
+static long long hash_start = 0;
+static const char *salt_string = NULL;
+
+static FILE *data_file;
+static FILE *hash_file;
+
+static off_t data_file_blocks;
+static off_t hash_file_blocks;
+static off_t used_hash_blocks;
+
+static char *root_hash_bytes;
+static char *calculated_digest;
+
+static char *salt_bytes;
+static unsigned salt_size;
+
+static unsigned digest_size;
+static unsigned char digest_size_bits;
+static unsigned char levels;
+static unsigned char hash_per_block_bits;
+
+static off_t hash_level_block[DM_VERITY_MAX_LEVELS];
+static off_t hash_level_size[DM_VERITY_MAX_LEVELS];
+
+static off_t superblock_position;
+
+static int retval = 0;
+
+static int opt_debug = 0;
+
+struct superblock {
+ uint8_t signature[8];
+ uint8_t version;
+ uint8_t data_block_bits;
+ uint8_t hash_block_bits;
+ uint8_t pad1[1];
+ uint16_t salt_size;
+ uint8_t pad2[2];
+ uint32_t data_blocks_hi;
+ uint32_t data_blocks_lo;
+ uint8_t algorithm[16];
+ uint8_t salt[MAX_SALT_SIZE];
+ uint8_t pad3[88];
+};
+
+#define DM_VERITY_SIGNATURE "verity\0\0"
+#define DM_VERITY_VERSION 0
+
+__attribute__((format(printf, 5, 6)))
+void logger(struct crypt_device *cd, int level, const char *file,
+ int line, const char *format, ...)
+{
+ va_list argp;
+ char *target = NULL;
+
+ va_start(argp, format);
+
+ if (vasprintf(&target, format, argp) > 0) {
+ if (level >= 0) {
+ printf("%s\n", target);
+ } else if (opt_debug)
+ printf("# %s\n", target);
+ }
+
+ va_end(argp);
+ free(target);
+}
+
+__attribute__((__noreturn__))
+static void help(poptContext popt_context,
+ enum poptCallbackReason reason,
+ struct poptOption *key,
+ const char *arg,
+ void *data)
+{
+ if (!strcmp(key->longName, "help")) {
+ poptPrintHelp(popt_context, stdout, 0);
+ } else {
+ printf("veritysetup");
+ printf("\n");
+ }
+ exit(0);
+}
+
+static struct poptOption popt_help_options[] = {
+ { NULL, 0, POPT_ARG_CALLBACK, help, 0, NULL, NULL },
+ { "help", 'h', POPT_ARG_NONE, NULL, 0, "Show help", NULL },
+ { "version", 0, POPT_ARG_NONE, NULL, 0, "Show version", NULL },
+ POPT_TABLEEND
+};
+
+static struct poptOption popt_options[] = {
+ { NULL, '\0', POPT_ARG_INCLUDE_TABLE, popt_help_options, 0, NULL, NULL },
+ { "create", 'c', POPT_ARG_VAL, &mode, MODE_CREATE, "Create hash", NULL },
+ { "verify", 'v', POPT_ARG_VAL, &mode, MODE_VERIFY, "Verify integrity", NULL },
+ { "activate", 'a', POPT_ARG_VAL, &mode, MODE_ACTIVATE, "Activate the device", NULL },
+ { "no-superblock", 0, POPT_ARG_VAL, &use_superblock, 0, "Do not create/use superblock" },
+ { "format", 0, POPT_ARG_INT, &version, 0, "Format version (1 - normal format, 0 - original Chromium OS format)", "number" },
+ { "data-block-size", 0, POPT_ARG_INT, &data_block_size, 0, "Block size on the data device", "bytes" },
+ { "hash-block-size", 0, POPT_ARG_INT, &hash_block_size, 0, "Block size on the hash device", "bytes" },
+ { "data-blocks", 0, POPT_ARG_STRING, &data_blocks_string, 0, "The number of blocks in the data file", "blocks" },
+ { "hash-start", 0, POPT_ARG_STRING, &hash_start_string, 0, "Starting block on the hash device", "512-byte sectors" },
+ { "algorithm", 0, POPT_ARG_STRING, &hash_algorithm, 0, "Hash algorithm (default sha256)", "string" },
+ { "salt", 0, POPT_ARG_STRING, &salt_string, 0, "Salt", "hex string" },
+ POPT_TABLEEND
+};
+
+__attribute__((__format__(__printf__, 1, 2), __noreturn__))
+static void exit_err(const char *msg, ...)
+{
+ va_list args;
+ va_start(args, msg);
+ vfprintf(stderr, msg, args);
+ va_end(args);
+ fputc('\n', stderr);
+ exit(2);
+}
+
+__attribute__((__noreturn__))
+static void stream_err(FILE *f, const char *msg)
+{
+ if (ferror(f)) {
+ perror(msg);
+ exit(2);
+ } else if (feof(f)) {
+ exit_err("eof on %s", msg);
+ } else {
+ exit_err("unknown error on %s", msg);
+ }
+}
+
+static void *xmalloc(size_t s)
+{
+ void *ptr = malloc(!s ? 1 : s);
+ if (!ptr) exit_err("out of memory");
+ return ptr;
+}
+
+static char *xstrdup(const char *str)
+{
+ return strcpy(xmalloc(strlen(str) + 1), str);
+}
+
+static char *xprint(unsigned long long num)
+{
+ size_t s = snprintf(NULL, 0, "%llu", num);
+ char *p = xmalloc(s + 1);
+ snprintf(p, s + 1, "%llu", num);
+ return p;
+}
+
+static char *xhexprint(char *bytes, size_t len)
+{
+ size_t i;
+ char *p = xmalloc(len * 2 + 1);
+ p[0] = 0;
+ for (i = 0; i < len; i++)
+ snprintf(p + i * 2, 3, "%02x", bytes[i]);
+ return p;
+}
+
+static off_t get_size(FILE *f, const char *name)
+{
+ struct stat st;
+ int h = fileno(f);
+ if (h < 0) {
+ perror("fileno");
+ exit(2);
+ }
+ if (fstat(h, &st)) {
+ perror("fstat");
+ exit(2);
+ }
+ if (S_ISREG(st.st_mode)) {
+ return st.st_size;
+ } else if (S_ISBLK(st.st_mode)) {
+ unsigned long long size64;
+ unsigned long sizeul;
+ if (!ioctl(h, BLKGETSIZE64, &size64)) {
+ return_size64:
+ if ((off_t)size64 < 0 || (off_t)size64 != size64) {
+ size_overflow:
+ exit_err("%s: device size overflow", name);
+ }
+ return size64;
+ }
+ if (!ioctl(h, BLKGETSIZE, &sizeul)) {
+ size64 = (unsigned long long)sizeul * 512;
+ if (size64 / 512 != sizeul) goto size_overflow;
+ goto return_size64;
+ }
+ perror("BLKGETSIZE");
+ exit(2);
+ } else {
+ exit_err("%s is not a file or a block device", name);
+ }
+ return -1; /* never reached, shut up warning */
+}
+
+static void block_fseek(FILE *f, off_t block, int block_size)
+{
+ unsigned long long pos = (unsigned long long)block * block_size;
+ if (pos / block_size != block ||
+ (off_t)pos < 0 ||
+ (off_t)pos != pos)
+ exit_err("seek position overflow");
+ if (fseeko(f, pos, SEEK_SET)) {
+ perror("fseek");
+ exit(2);
+ }
+}
+
+static off_t verity_position_at_level(off_t block, int level)
+{
+ return block >> (level * hash_per_block_bits);
+}
+
+static void calculate_positions(void)
+{
+ unsigned long long hash_position;
+ int i;
+
+ digest_size_bits = 0;
+ while (1 << digest_size_bits < digest_size)
+ digest_size_bits++;
+ hash_per_block_bits = 0;
+ while (((hash_block_size / digest_size) >> hash_per_block_bits) > 1)
+ hash_per_block_bits++;
+ if (!hash_per_block_bits)
+ exit_err("at least two hashes must fit in a hash file block");
+ levels = 0;
+
+ if (data_file_blocks) {
+ while (hash_per_block_bits * levels < 64 &&
+ (unsigned long long)(data_file_blocks - 1) >>
+ (hash_per_block_bits * levels))
+ levels++;
+ }
+
+ if (levels > DM_VERITY_MAX_LEVELS)
+ exit_err("too many tree levels");
+
+ hash_position = hash_start * 512 / hash_block_size;
+ for (i = levels - 1; i >= 0; i--) {
+ off_t s;
+ hash_level_block[i] = hash_position;
+ s = verity_position_at_level(data_file_blocks, i);
+ s = (s >> hash_per_block_bits) +
+ !!(s & ((1 << hash_per_block_bits) - 1));
+ hash_level_size[i] = s;
+ if (hash_position + s < hash_position ||
+ (off_t)(hash_position + s) < 0 ||
+ (off_t)(hash_position + s) != hash_position + s)
+ exit_err("hash device offset overflow");
+ hash_position += s;
+ }
+ used_hash_blocks = hash_position;
+}
+
+static void create_or_verify_zero(FILE *wr, char *left_block, unsigned left_bytes)
+{
+ if (left_bytes) {
+ if (mode != MODE_CREATE) {
+ unsigned x;
+ if (fread(left_block, left_bytes, 1, wr) != 1)
+ stream_err(wr, "read");
+ for (x = 0; x < left_bytes; x++) if (left_block[x]) {
+ retval = 1;
+ fprintf(stderr, "spare area is not zeroed at position %lld\n", (long long)ftello(wr) - left_bytes);
+ }
+ } else {
+ if (fwrite(left_block, left_bytes, 1, wr) != 1)
+ stream_err(wr, "write");
+ }
+ }
+}
+
+static void create_or_verify_stream(FILE *rd, FILE *wr, int block_size, off_t blocks)
+{
+ char *left_block = xmalloc(hash_block_size);
+ char *data_buffer = xmalloc(block_size);
+ char *read_digest = mode != MODE_CREATE ? xmalloc(digest_size) : NULL;
+ off_t blocks_to_write = (blocks >> hash_per_block_bits) +
+ !!(blocks & ((1 << hash_per_block_bits) - 1));
+ struct crypt_hash *ctx = NULL;
+
+ if (crypt_hash_init(&ctx, hash_algorithm))
+ exit_err("hash_init failed");
+
+ memset(left_block, 0, hash_block_size);
+ while (blocks_to_write--) {
+ unsigned x;
+ unsigned left_bytes = hash_block_size;
+ for (x = 0; x < 1 << hash_per_block_bits; x++) {
+ if (!blocks)
+ break;
+ blocks--;
+ if (fread(data_buffer, block_size, 1, rd) != 1)
+ stream_err(rd, "read");
+ if (version >= 1) {
+ if (crypt_hash_write(ctx, salt_bytes, salt_size))
+ exit_err("hash_write failed");
+ }
+ if (crypt_hash_write(ctx, data_buffer, block_size))
+ exit_err("hash_write failed");
+ if (!version) {
+ if (crypt_hash_write(ctx, salt_bytes, salt_size))
+ exit_err("hash_write failed");
+ }
+ if (crypt_hash_final(ctx, calculated_digest, digest_size))
+ exit_err("hash_final failed");
+ if (!wr)
+ break;
+ if (mode != MODE_CREATE) {
+ if (fread(read_digest, digest_size, 1, wr) != 1)
+ stream_err(wr, "read");
+ if (memcmp(read_digest, calculated_digest, digest_size)) {
+ retval = 1;
+ fprintf(stderr, "verification failed at position %lld in %s file\n", (long long)ftello(rd) - block_size, rd == data_file ? "data" : "metadata");
+ }
+ } else {
+ if (fwrite(calculated_digest, digest_size, 1, wr) != 1)
+ stream_err(wr, "write");
+ }
+ if (!version) {
+ left_bytes -= digest_size;
+ } else {
+ create_or_verify_zero(wr, left_block, (1 << digest_size_bits) - digest_size);
+ left_bytes -= 1 << digest_size_bits;
+ }
+ }
+ if (wr)
+ create_or_verify_zero(wr, left_block, left_bytes);
+ }
+ if (mode == MODE_CREATE && wr) {
+ if (fflush(wr)) {
+ perror("fflush");
+ exit(1);
+ }
+ if (ferror(wr)) {
+ stream_err(wr, "write");
+ }
+ }
+ crypt_hash_destroy(ctx);
+ free(left_block);
+ free(data_buffer);
+ if (mode != MODE_CREATE)
+ free(read_digest);
+}
+
+static char **make_target_line(void)
+{
+ const int line_elements = 14;
+ char **line = xmalloc(line_elements * sizeof(char *));
+ int i = 0;
+ char *algorithm_copy = xstrdup(hash_algorithm);
+ /* transform ripemdXXX to rmdXXX */
+ if (!strncmp(algorithm_copy, "ripemd", 6))
+ memmove(algorithm_copy + 1, algorithm_copy + 4, strlen(algorithm_copy + 4) + 1);
+ if (!strcmp(algorithm_copy, "whirlpool"))
+ strcpy(algorithm_copy, "wp512");
+ line[i++] = xstrdup("0");
+ line[i++] = xprint((unsigned long long)data_file_blocks * data_block_size / 512);
+ line[i++] = xstrdup("verity");
+ line[i++] = xprint(version);
+ line[i++] = xstrdup(data_device);
+ line[i++] = xstrdup(hash_device);
+ line[i++] = xprint(data_block_size);
+ line[i++] = xprint(hash_block_size);
+ line[i++] = xprint(data_file_blocks);
+ line[i++] = xprint(hash_start * 512 / hash_block_size);
+ line[i++] = algorithm_copy;
+ line[i++] = xhexprint(calculated_digest, digest_size);
+ line[i++] = !salt_size ? xstrdup("-") : xhexprint(salt_bytes, salt_size);
+ line[i++] = NULL;
+ if (i > line_elements)
+ exit_err("INTERNAL ERROR: insufficient array size");
+ return line;
+}
+
+static void free_target_line(char **line)
+{
+ int i;
+ for (i = 0; line[i]; i++)
+ free(line[i]);
+ free(line);
+}
+
+static void create_or_verify(void)
+{
+ int i;
+
+ memset(calculated_digest, 0, digest_size);
+ if (mode != MODE_ACTIVATE)
+ for (i = 0; i < levels; i++) {
+ block_fseek(hash_file, hash_level_block[i], hash_block_size);
+ if (!i) {
+ block_fseek(data_file, 0, data_block_size);
+ create_or_verify_stream(data_file, hash_file, data_block_size, data_file_blocks);
+ } else {
+ FILE *hash_file_2 = fopen(hash_device, "r");
+ if (!hash_file_2) {
+ perror(hash_device);
+ exit(2);
+ }
+ block_fseek(hash_file_2, hash_level_block[i - 1], hash_block_size);
+ create_or_verify_stream(hash_file_2, hash_file, hash_block_size, hash_level_size[i - 1]);
+ fclose(hash_file_2);
+ }
+ }
+
+ if (levels) {
+ block_fseek(hash_file, hash_level_block[levels - 1], hash_block_size);
+ create_or_verify_stream(hash_file, NULL, hash_block_size, 1);
+ } else {
+ block_fseek(data_file, 0, data_block_size);
+ create_or_verify_stream(data_file, NULL, data_block_size, data_file_blocks);
+ }
+
+ if (mode != MODE_CREATE) {
+ if (memcmp(calculated_digest, root_hash_bytes, digest_size)) {
+ fprintf(stderr, "verification failed in the root block\n");
+ retval = 1;
+ }
+ if (!retval && mode == MODE_VERIFY)
+ fprintf(stderr, "hash successfully verified\n");
+ } else {
+ char **target_line;
+ char *p;
+ if (fsync(fileno(hash_file))) {
+ perror("fsync");
+ exit(1);
+ }
+ printf("hash device size: %llu\n", (unsigned long long)used_hash_blocks * hash_block_size);
+ printf("data block size %u, hash block size %u, %u tree levels\n", data_block_size, hash_block_size, levels);
+ if (salt_size)
+ p = xhexprint(salt_bytes, salt_size);
+ else
+ p = xstrdup("-");
+ printf("salt: %s\n", p);
+ free(p);
+ p = xhexprint(calculated_digest, digest_size);
+ printf("root hash: %s\n", p);
+ free(p);
+ printf("target line:");
+ target_line = make_target_line();
+ for (i = 0; target_line[i]; i++)
+ printf(" %s", target_line[i]);
+ free_target_line(target_line);
+ printf("\n");
+ }
+}
+
+__attribute__((__noreturn__))
+static void activate(void)
+{
+ int i;
+ size_t len = 1;
+ char *table_arg;
+ char **target_line = make_target_line();
+ for (i = 0; target_line[i]; i++) {
+ if (i)
+ len++;
+ len += strlen(target_line[i]);
+ }
+ table_arg = xmalloc(len);
+ table_arg[0] = 0;
+ for (i = 0; target_line[i]; i++) {
+ if (i)
+ strcat(table_arg, " ");
+ strcat(table_arg, target_line[i]);
+ }
+ free_target_line(target_line);
+ execlp("dmsetup", "dmsetup", "-r", "create", dm_device, "--table", table_arg, NULL);
+ perror("dmsetup");
+ exit(2);
+}
+
+static void get_hex(const char *string, char **result, size_t len, const char *description)
+{
+ size_t rl = strlen(string);
+ unsigned u;
+ if (strspn(string, "0123456789ABCDEFabcdef") != rl)
+ exit_err("invalid %s", description);
+ if (rl != len * 2)
+ exit_err("invalid length of %s", description);
+ *result = xmalloc(len);
+ memset(*result, 0, len);
+ for (u = 0; u < rl; u++) {
+ unsigned char c = (string[u] & 15) + (string[u] > '9' ? 9 : 0);
+ (*result)[u / 2] |= c << (((u & 1) ^ 1) << 2);
+ }
+}
+
+static struct superblock superblock;
+
+static void load_superblock(void)
+{
+ long long sb_data_blocks;
+
+ block_fseek(hash_file, superblock_position, 1);
+ if (fread(&superblock, sizeof(struct superblock), 1, hash_file) != 1)
+ stream_err(hash_file, "read");
+ if (memcmp(superblock.signature, DM_VERITY_SIGNATURE, sizeof(superblock.signature)))
+ exit_err("superblock not found on the hash device");
+ if (superblock.version > MAX_FORMAT_VERSION)
+ exit_err("unknown version");
+ if (superblock.data_block_bits < 9 || superblock.data_block_bits >= 31)
+ exit_err("invalid data_block_bits in the superblock");
+ if (superblock.hash_block_bits < 9 || superblock.hash_block_bits >= 31)
+ exit_err("invalid data_block_bits in the superblock");
+ sb_data_blocks = ((unsigned long long)ntohl(superblock.data_blocks_hi) << 31 << 1) | ntohl(superblock.data_blocks_lo);
+ if (sb_data_blocks < 0 || (off_t)sb_data_blocks < 0 || (off_t)sb_data_blocks != sb_data_blocks)
+ exit_err("invalid data blocks in the superblock");
+ if (!memchr(superblock.algorithm, 0, sizeof(superblock.algorithm)))
+ exit_err("invalid hash algorithm in the superblock");
+ if (ntohs(superblock.salt_size) > MAX_SALT_SIZE)
+ exit_err("invalid salt_size in the superblock");
+
+ if (version == -1) {
+ version = superblock.version;
+ } else {
+ if (version != superblock.version)
+ exit_err("version (%d) does not match superblock value (%d)", version, superblock.version);
+ }
+
+ if (!data_block_size) {
+ data_block_size = 1 << superblock.data_block_bits;
+ } else {
+ if (data_block_size != 1 << superblock.data_block_bits)
+ exit_err("data block size (%d) does not match superblock value (%d)", data_block_size, 1 << superblock.data_block_bits);
+ }
+
+ if (!hash_block_size) {
+ hash_block_size = 1 << superblock.hash_block_bits;
+ } else {
+ if (hash_block_size != 1 << superblock.hash_block_bits)
+ exit_err("hash block size (%d) does not match superblock value (%d)", hash_block_size, 1 << superblock.hash_block_bits);
+ }
+
+ if (!data_blocks_string) {
+ data_blocks = sb_data_blocks;
+ data_blocks_string = (char *)"";
+ } else {
+ if (data_blocks != sb_data_blocks)
+ exit_err("data blocks (%lld) does not match superblock value (%lld)", data_blocks, sb_data_blocks);
+ }
+
+ if (!hash_algorithm) {
+ hash_algorithm = (char *)superblock.algorithm;
+ } else {
+ if (strcmp(hash_algorithm, (char *)superblock.algorithm))
+ exit_err("hash algorithm (%s) does not match superblock value (%s)", hash_algorithm, superblock.algorithm);
+ }
+
+ if (!salt_bytes) {
+ salt_size = ntohs(superblock.salt_size);
+ salt_bytes = xmalloc(salt_size);
+ memcpy(salt_bytes, superblock.salt, salt_size);
+ } else {
+ if (salt_size != ntohs(superblock.salt_size) ||
+ memcmp(salt_bytes, superblock.salt, salt_size))
+ exit_err("salt does not match superblock value");
+ }
+}
+
+static void save_superblock(void)
+{
+ memset(&superblock, 0, sizeof(struct superblock));
+
+ memcpy(&superblock.signature, DM_VERITY_SIGNATURE, sizeof(superblock.signature));
+ superblock.version = version;
+ superblock.data_block_bits = ffs(data_block_size) - 1;
+ superblock.hash_block_bits = ffs(hash_block_size) - 1;
+ superblock.salt_size = htons(salt_size);
+ superblock.data_blocks_hi = htonl(data_file_blocks >> 31 >> 1);
+ superblock.data_blocks_lo = htonl(data_file_blocks & 0xFFFFFFFF);
+ strncpy((char *)superblock.algorithm, hash_algorithm, sizeof superblock.algorithm);
+ memcpy(superblock.salt, salt_bytes, salt_size);
+
+ block_fseek(hash_file, superblock_position, 1);
+ if (fwrite(&superblock, sizeof(struct superblock), 1, hash_file) != 1)
+ stream_err(hash_file, "write");
+}
+
+int main(int argc, const char **argv)
+{
+ poptContext popt_context;
+ int r;
+ const char *s;
+ char *end;
+
+ if (sizeof(struct superblock) != 512)
+ exit_err("INTERNAL ERROR: bad superblock size %ld", (long)sizeof(struct superblock));
+
+ popt_context = poptGetContext("verity", argc, argv, popt_options, 0);
+
+ poptSetOtherOptionHelp(popt_context, "[-c | -v | -a] [<device name> if activating] <data device> <hash device> [<root hash> if activating or verifying] [OPTION...]");
+
+ if (argc <= 1) {
+ poptPrintHelp(popt_context, stdout, 0);
+ exit(1);
+ }
+
+ r = poptGetNextOpt(popt_context);
+ if (r < -1)
+ exit_err("bad option %s", poptBadOption(popt_context, 0));
+
+ if (mode < 0)
+ exit_err("verify, create or activate mode not specified");
+
+ if (mode == MODE_ACTIVATE) {
+ dm_device = poptGetArg(popt_context);
+ if (!dm_device)
+ exit_err("device name is missing");
+ if (!*dm_device || strchr(dm_device, '/'))
+ exit_err("invalid device name to activate");
+ }
+
+ data_device = poptGetArg(popt_context);
+ if (!data_device)
+ exit_err("data device is missing");
+
+ hash_device = poptGetArg(popt_context);
+ if (!hash_device)
+ exit_err("metadata device is missing");
+
+ if (mode != MODE_CREATE) {
+ root_hash = poptGetArg(popt_context);
+ if (!root_hash)
+ exit_err("root hash not specified");
+ }
+
+ s = poptGetArg(popt_context);
+ if (s)
+ exit_err("extra argument %s", s);
+
+ data_file = fopen(data_device, "r");
+ if (!data_file) {
+ perror(data_device);
+ exit(2);
+ }
+
+ hash_file = fopen(hash_device, mode != MODE_CREATE ? "r" : "r+");
+ if (!hash_file && errno == ENOENT && mode == MODE_CREATE)
+ hash_file = fopen(hash_device, "w+");
+ if (!hash_file) {
+ perror(hash_device);
+ exit(2);
+ }
+
+ if (data_blocks_string) {
+ data_blocks = strtoll(data_blocks_string, &end, 10);
+ if (!*data_blocks_string || *end)
+ exit_err("invalid number of data blocks");
+ }
+
+ if (hash_start_string) {
+ hash_start = strtoll(hash_start_string, &end, 10);
+ if (!*hash_start_string || *end)
+ exit_err("invalid hash start");
+ }
+
+ if (hash_start < 0 ||
+ (unsigned long long)hash_start * 512 / 512 != hash_start ||
+ (off_t)(hash_start * 512) < 0 ||
+ (off_t)(hash_start * 512) != hash_start * 512) exit_err("invalid hash start");
+
+ if (salt_string || !use_superblock) {
+ if (!salt_string || !strcmp(salt_string, "-"))
+ salt_string = "";
+ salt_size = strlen(salt_string) / 2;
+ if (salt_size > MAX_SALT_SIZE)
+ exit_err("too long salt (max %d bytes)", MAX_SALT_SIZE);
+ get_hex(salt_string, &salt_bytes, salt_size, "salt");
+ }
+
+ if (use_superblock) {
+ superblock_position = hash_start * 512;
+ if (mode != MODE_CREATE)
+ load_superblock();
+ }
+
+ if (version == -1)
+ version = MAX_FORMAT_VERSION;
+ if (version < 0 || version > MAX_FORMAT_VERSION)
+ exit_err("invalid format version");
+
+ if (!data_block_size)
+ data_block_size = DEFAULT_BLOCK_SIZE;
+ if (!hash_block_size)
+ hash_block_size = data_block_size;
+
+ if (data_block_size < 512 || (data_block_size & (data_block_size - 1)) || data_block_size >= 1U << 31)
+ exit_err("invalid data block size");
+
+ if (hash_block_size < 512 || (hash_block_size & (hash_block_size - 1)) || hash_block_size >= 1U << 31)
+ exit_err("invalid hash block size");
+
+ if (data_blocks < 0 || (off_t)data_blocks < 0 || (off_t)data_blocks != data_blocks)
+ exit_err("invalid number of data blocks");
+
+ data_file_blocks = get_size(data_file, data_device) / data_block_size;
+ hash_file_blocks = get_size(hash_file, hash_device) / hash_block_size;
+
+ if (data_file_blocks < data_blocks)
+ exit_err("data file is too small");
+ if (data_blocks_string)
+ data_file_blocks = data_blocks;
+
+ if (use_superblock) {
+ hash_start = hash_start + (sizeof(struct superblock) + 511) / 512;
+ hash_start = (hash_start + (hash_block_size / 512 - 1)) & ~(long long)(hash_block_size / 512 - 1);
+ }
+
+ if ((unsigned long long)hash_start * 512 % hash_block_size)
+ exit_err("hash start not aligned on block size");
+
+ if (!hash_algorithm)
+ hash_algorithm = "sha256";
+ if (strlen(hash_algorithm) >= sizeof(superblock.algorithm) && use_superblock)
+ exit_err("hash algorithm name is too long");
+
+ if (crypt_backend_init(NULL))
+ exit_err("cannot initialize crypto backend");
+
+ digest_size = crypt_hash_size(hash_algorithm);
+ if (!digest_size) exit_err("hash algorithm %s not found", hash_algorithm);
+
+ if (!salt_bytes) {
+ salt_size = DEFAULT_SALT_SIZE;
+ salt_bytes = xmalloc(salt_size);
+ if (crypt_backend_rng(salt_bytes, salt_size, CRYPT_RND_SALT, 0))
+ exit_err("rng failed");
+ }
+
+ calculated_digest = xmalloc(digest_size);
+
+ if (mode != MODE_CREATE) {
+ get_hex(root_hash, &root_hash_bytes, digest_size, "root_hash");
+ }
+
+ calculate_positions();
+
+ create_or_verify();
+
+ if (use_superblock) {
+ if (mode == MODE_CREATE)
+ save_superblock();
+ }
+
+ fclose(data_file);
+ fclose(hash_file);
+
+ if (mode == MODE_ACTIVATE && !retval)
+ activate();
+
+ free(salt_bytes);
+ free(calculated_digest);
+ if (mode != MODE_CREATE)
+ free(root_hash_bytes);
+ poptFreeContext(popt_context);
+
+ return retval;
+}
projects / platform / upstream / cryptsetup.git / commitdiff