/*
* utils_crypt - cipher utilities for cryptsetup
*
- * Copyright (C) 2004-2007, Clemens Fruhwirth <clemens@endorphin.org>
- * Copyright (C) 2009-2012, Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2004-2007 Clemens Fruhwirth <clemens@endorphin.org>
+ * Copyright (C) 2009-2020 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2009-2020 Milan Broz
*
* 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.
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
*/
#include <stdlib.h>
-#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
-#include <ctype.h>
-#include <limits.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <termios.h>
#include "libcryptsetup.h"
-#include "nls.h"
#include "utils_crypt.h"
-#define log_dbg(x) crypt_log(NULL, CRYPT_LOG_DEBUG, x)
-#define log_err(cd, x) crypt_log(cd, CRYPT_LOG_ERROR, x)
-
-struct safe_allocation {
- size_t size;
- char data[0];
-};
-
int crypt_parse_name_and_mode(const char *s, char *cipher, int *key_nums,
char *cipher_mode)
{
+ if (!s || !cipher || !cipher_mode)
+ return -EINVAL;
+
if (sscanf(s, "%" MAX_CIPHER_LEN_STR "[^-]-%" MAX_CIPHER_LEN_STR "s",
cipher, cipher_mode) == 2) {
if (!strcmp(cipher_mode, "plain"))
- strncpy(cipher_mode, "cbc-plain", 10);
+ strcpy(cipher_mode, "cbc-plain");
if (key_nums) {
char *tmp = strchr(cipher, ':');
*key_nums = tmp ? atoi(++tmp) : 1;
}
/* Short version for "empty" cipher */
- if (!strcmp(s, "null")) {
- strncpy(cipher, "cipher_null", MAX_CIPHER_LEN);
- strncpy(cipher_mode, "ecb", 9);
+ if (!strcmp(s, "null") || !strcmp(s, "cipher_null")) {
+ strcpy(cipher, "cipher_null");
+ strcpy(cipher_mode, "ecb");
if (key_nums)
*key_nums = 0;
return 0;
}
if (sscanf(s, "%" MAX_CIPHER_LEN_STR "[^-]", cipher) == 1) {
- strncpy(cipher_mode, "cbc-plain", 10);
+ strcpy(cipher_mode, "cbc-plain");
if (key_nums)
*key_nums = 1;
return 0;
return -EINVAL;
}
-/* safe allocations */
-void *crypt_safe_alloc(size_t size)
-{
- struct safe_allocation *alloc;
-
- if (!size)
- return NULL;
-
- alloc = malloc(size + offsetof(struct safe_allocation, data));
- if (!alloc)
- return NULL;
-
- alloc->size = size;
-
- return &alloc->data;
-}
-
-void crypt_safe_free(void *data)
-{
- struct safe_allocation *alloc;
-
- if (!data)
- return;
-
- alloc = (struct safe_allocation *)
- ((char *)data - offsetof(struct safe_allocation, data));
-
- memset(data, 0, alloc->size);
-
- alloc->size = 0x55aa55aa;
- free(alloc);
-}
-
-void *crypt_safe_realloc(void *data, size_t size)
+int crypt_parse_hash_integrity_mode(const char *s, char *integrity)
{
- struct safe_allocation *alloc;
- void *new_data;
-
- new_data = crypt_safe_alloc(size);
+ char mode[MAX_CIPHER_LEN], hash[MAX_CIPHER_LEN];
+ int r;
- if (new_data && data) {
-
- alloc = (struct safe_allocation *)
- ((char *)data - offsetof(struct safe_allocation, data));
-
- if (size > alloc->size)
- size = alloc->size;
-
- memcpy(new_data, data, size);
- }
-
- crypt_safe_free(data);
- return new_data;
-}
-
-/* Password reading helpers */
-static int untimed_read(int fd, char *pass, size_t maxlen)
-{
- ssize_t i;
-
- i = read(fd, pass, maxlen);
- if (i > 0) {
- pass[i-1] = '\0';
- i = 0;
- } else if (i == 0) { /* EOF */
- *pass = 0;
- i = -1;
- }
- return i;
-}
-
-static int timed_read(int fd, char *pass, size_t maxlen, long timeout)
-{
- struct timeval t;
- fd_set fds;
- int failed = -1;
-
- FD_ZERO(&fds);
- FD_SET(fd, &fds);
- t.tv_sec = timeout;
- t.tv_usec = 0;
-
- if (select(fd+1, &fds, NULL, NULL, &t) > 0)
- failed = untimed_read(fd, pass, maxlen);
-
- return failed;
-}
-
-static int interactive_pass(const char *prompt, char *pass, size_t maxlen,
- long timeout)
-{
- struct termios orig, tmp;
- int failed = -1;
- int infd = STDIN_FILENO, outfd;
-
- if (maxlen < 1)
- goto out_err;
-
- /* Read and write to /dev/tty if available */
- if ((infd = outfd = open("/dev/tty", O_RDWR)) == -1) {
- infd = STDIN_FILENO;
- outfd = STDERR_FILENO;
- }
-
- if (tcgetattr(infd, &orig))
- goto out_err;
-
- memcpy(&tmp, &orig, sizeof(tmp));
- tmp.c_lflag &= ~ECHO;
-
- if (prompt && write(outfd, prompt, strlen(prompt)) < 0)
- goto out_err;
+ if (!s || !integrity || strchr(s, '(') || strchr(s, ')'))
+ return -EINVAL;
- tcsetattr(infd, TCSAFLUSH, &tmp);
- if (timeout)
- failed = timed_read(infd, pass, maxlen, timeout);
+ r = sscanf(s, "%" MAX_CIPHER_LEN_STR "[^-]-%" MAX_CIPHER_LEN_STR "s", mode, hash);
+ if (r == 2)
+ r = snprintf(integrity, MAX_CIPHER_LEN, "%s(%s)", mode, hash);
+ else if (r == 1)
+ r = snprintf(integrity, MAX_CIPHER_LEN, "%s", mode);
else
- failed = untimed_read(infd, pass, maxlen);
- tcsetattr(infd, TCSAFLUSH, &orig);
+ return -EINVAL;
-out_err:
- if (!failed && write(outfd, "\n", 1)) {};
+ if (r < 0 || r == MAX_CIPHER_LEN)
+ return -EINVAL;
- if (infd != STDIN_FILENO)
- close(infd);
- return failed;
+ return 0;
}
-static int crypt_get_key_tty(const char *prompt,
- char **key, size_t *key_size,
- int timeout, int verify,
- struct crypt_device *cd)
+int crypt_parse_integrity_mode(const char *s, char *integrity,
+ int *integrity_key_size)
{
- int key_size_max = DEFAULT_PASSPHRASE_SIZE_MAX;
- int r = -EINVAL;
- char *pass = NULL, *pass_verify = NULL;
-
- log_dbg("Interactive passphrase entry requested.");
-
- pass = crypt_safe_alloc(key_size_max + 1);
- if (!pass) {
- log_err(cd, _("Out of memory while reading passphrase.\n"));
- return -ENOMEM;
- }
-
- if (interactive_pass(prompt, pass, key_size_max, timeout)) {
- log_err(cd, _("Error reading passphrase from terminal.\n"));
- goto out_err;
- }
- pass[key_size_max] = '\0';
+ int ks = 0, r = 0;
- if (verify) {
- pass_verify = crypt_safe_alloc(key_size_max);
- if (!pass_verify) {
- log_err(cd, _("Out of memory while reading passphrase.\n"));
- r = -ENOMEM;
- goto out_err;
- }
-
- if (interactive_pass(_("Verify passphrase: "),
- pass_verify, key_size_max, timeout)) {
- log_err(cd, _("Error reading passphrase from terminal.\n"));
- goto out_err;
- }
+ if (!s || !integrity)
+ return -EINVAL;
- if (strncmp(pass, pass_verify, key_size_max)) {
- log_err(cd, _("Passphrases do not match.\n"));
- r = -EPERM;
- goto out_err;
- }
- }
+ // FIXME: do not hardcode it here
+
+ /* AEAD modes */
+ if (!strcmp(s, "aead") ||
+ !strcmp(s, "poly1305") ||
+ !strcmp(s, "none")) {
+ strncpy(integrity, s, MAX_CIPHER_LEN);
+ ks = 0;
+ } else if (!strcmp(s, "hmac-sha1")) {
+ strncpy(integrity, "hmac(sha1)", MAX_CIPHER_LEN);
+ ks = 20;
+ } else if (!strcmp(s, "hmac-sha256")) {
+ strncpy(integrity, "hmac(sha256)", MAX_CIPHER_LEN);
+ ks = 32;
+ } else if (!strcmp(s, "hmac-sha512")) {
+ ks = 64;
+ strncpy(integrity, "hmac(sha512)", MAX_CIPHER_LEN);
+ } else if (!strcmp(s, "cmac-aes")) {
+ ks = 16;
+ strncpy(integrity, "cmac(aes)", MAX_CIPHER_LEN);
+ } else
+ r = -EINVAL;
+
+ if (integrity_key_size)
+ *integrity_key_size = ks;
- *key = pass;
- *key_size = strlen(pass);
- r = 0;
-out_err:
- crypt_safe_free(pass_verify);
- if (r)
- crypt_safe_free(pass);
return r;
}
-/*
- * Note: --key-file=- is interpreted as a read from a binary file (stdin)
- * key_size_max == 0 means detect maximum according to input type (tty/file)
- * timeout and verify options only applies to tty input
- */
-int crypt_get_key(const char *prompt,
- char **key, size_t *key_size,
- size_t keyfile_offset, size_t keyfile_size_max,
- const char *key_file, int timeout, int verify,
- struct crypt_device *cd)
+int crypt_parse_pbkdf(const char *s, const char **pbkdf)
{
- int fd, regular_file, read_stdin, char_read, unlimited_read = 0;
- int r = -EINVAL;
- char *pass = NULL, tmp;
- size_t buflen, i, file_read_size;
- struct stat st;
+ const char *tmp = NULL;
- *key = NULL;
- *key_size = 0;
-
- /* Passphrase read from stdin? */
- read_stdin = (!key_file || !strcmp(key_file, "-")) ? 1 : 0;
-
- if (read_stdin && isatty(STDIN_FILENO)) {
- if (keyfile_offset) {
- log_err(cd, _("Cannot use offset with terminal input.\n"));
- return -EINVAL;
- }
- return crypt_get_key_tty(prompt, key, key_size, timeout, verify, cd);
- }
-
- if (read_stdin)
- log_dbg("STDIN descriptor passphrase entry requested.");
- else
- log_dbg("File descriptor passphrase entry requested.");
-
- /* If not requsted otherwise, we limit input to prevent memory exhaustion */
- if (keyfile_size_max == 0) {
- keyfile_size_max = DEFAULT_KEYFILE_SIZE_MAXKB * 1024;
- unlimited_read = 1;
- }
-
- fd = read_stdin ? STDIN_FILENO : open(key_file, O_RDONLY);
- if (fd < 0) {
- log_err(cd, _("Failed to open key file.\n"));
+ if (!s)
return -EINVAL;
- }
- /* use 4k for buffer (page divisor but avoid huge pages) */
- buflen = 4096 - sizeof(struct safe_allocation);
- regular_file = 0;
- if(!read_stdin) {
- if(stat(key_file, &st) < 0) {
- log_err(cd, _("Failed to stat key file.\n"));
- goto out_err;
- }
- if(S_ISREG(st.st_mode)) {
- regular_file = 1;
- file_read_size = (size_t)st.st_size;
-
- if (keyfile_offset > file_read_size) {
- log_err(cd, _("Cannot seek to requested keyfile offset.\n"));
- goto out_err;
- }
- file_read_size -= keyfile_offset;
-
- /* known keyfile size, alloc it in one step */
- if (file_read_size >= keyfile_size_max)
- buflen = keyfile_size_max;
- else if (file_read_size)
- buflen = file_read_size;
- }
- }
-
- pass = crypt_safe_alloc(buflen);
- if (!pass) {
- log_err(cd, _("Out of memory while reading passphrase.\n"));
- goto out_err;
- }
-
- /* Discard keyfile_offset bytes on input */
- for(i = 0; i < keyfile_offset; i++)
- if (read(fd, &tmp, 1) != 1) {
- log_err(cd, _("Cannot seek to requested keyfile offset.\n"));
- goto out_err;
- }
-
- for(i = 0; i < keyfile_size_max; i++) {
- if(i == buflen) {
- buflen += 4096;
- pass = crypt_safe_realloc(pass, buflen);
- if (!pass) {
- log_err(cd, _("Out of memory while reading passphrase.\n"));
- r = -ENOMEM;
- goto out_err;
- }
- }
-
- char_read = read(fd, &pass[i], 1);
- if (char_read < 0) {
- log_err(cd, _("Error reading passphrase.\n"));
- goto out_err;
- }
-
- /* Stop on newline only if not requested read from keyfile */
- if(char_read == 0 || (!key_file && pass[i] == '\n'))
- break;
- }
+ if (!strcasecmp(s, CRYPT_KDF_PBKDF2))
+ tmp = CRYPT_KDF_PBKDF2;
+ else if (!strcasecmp(s, CRYPT_KDF_ARGON2I))
+ tmp = CRYPT_KDF_ARGON2I;
+ else if (!strcasecmp(s, CRYPT_KDF_ARGON2ID))
+ tmp = CRYPT_KDF_ARGON2ID;
- /* Fail if piped input dies reading nothing */
- if(!i && !regular_file) {
- log_dbg("Nothing read on input.");
- r = -EPIPE;
- goto out_err;
- }
-
- /* Fail if we exceeded internal default (no specified size) */
- if (unlimited_read && i == keyfile_size_max) {
- log_err(cd, _("Maximum keyfile size exceeded.\n"));
- goto out_err;
- }
-
- if (!unlimited_read && i != keyfile_size_max) {
- log_err(cd, _("Cannot read requested amount of data.\n"));
- goto out_err;
- }
+ if (!tmp)
+ return -EINVAL;
- *key = pass;
- *key_size = i;
- r = 0;
-out_err:
- if(fd != STDIN_FILENO)
- close(fd);
+ if (pbkdf)
+ *pbkdf = tmp;
- if (r)
- crypt_safe_free(pass);
- return r;
+ return 0;
}
ssize_t crypt_hex_to_bytes(const char *hex, char **result, int safe_alloc)
*result = bytes;
return i;
}
-
-/*
- * Device size string parsing, suffixes:
- * s|S - 512 bytes sectors
- * k |K |m |M |g |G |t |T - 1024 base
- * kiB|KiB|miB|MiB|giB|GiB|tiB|TiB - 1024 base
- * kb |KB |mM |MB |gB |GB |tB |TB - 1000 base
- */
-int crypt_string_to_size(struct crypt_device *cd, const char *s, uint64_t *size)
-{
- char *endp = NULL;
- size_t len;
- uint64_t mult_base, mult, tmp;
-
- *size = strtoull(s, &endp, 10);
- if (!isdigit(s[0]) ||
- (errno == ERANGE && *size == ULLONG_MAX) ||
- (errno != 0 && *size == 0))
- return -EINVAL;
-
- if (!endp)
- return 0;
-
- len = strlen(endp);
- /* Allow "B" and "iB" suffixes */
- if (len > 3 ||
- (len == 3 && (endp[1] != 'i' || endp[2] != 'B')) ||
- (len == 2 && endp[1] != 'B'))
- return -EINVAL;
-
- if (len == 1 || len == 3)
- mult_base = 1024;
- else
- mult_base = 1000;
-
- mult = 1;
- switch (endp[0]) {
- case 's':
- case 'S': mult = 512;
- break;
- case 't':
- case 'T': mult *= mult_base;
- case 'g':
- case 'G': mult *= mult_base;
- case 'm':
- case 'M': mult *= mult_base;
- case 'k':
- case 'K': mult *= mult_base;
- break;
- default:
- return -EINVAL;
- }
-
- tmp = *size * mult;
- if ((tmp / *size) != mult) {
- log_dbg("Device size overflow.");
- return -EINVAL;
- }
-
- *size = tmp;
- return 0;
-}
projects / platform / upstream / cryptsetup.git / blobdiff