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/*
* utils - miscellaneous device utilities for cryptsetup
*
* Copyright (C) 2004 Jana Saout <jana@saout.de>
* Copyright (C) 2004-2007 Clemens Fruhwirth <clemens@endorphin.org>
* Copyright (C) 2009-2023 Red Hat, Inc. All rights reserved.
* Copyright (C) 2009-2023 Milan Broz
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* 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
* 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.
*/
#include <stdio.h>
#include <errno.h>
#include <sys/mman.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include "internal.h"
size_t crypt_getpagesize(void)
{
long r = sysconf(_SC_PAGESIZE);
return r <= 0 ? DEFAULT_MEM_ALIGNMENT : (size_t)r;
}
unsigned crypt_cpusonline(void)
{
long r = sysconf(_SC_NPROCESSORS_ONLN);
return r < 0 ? 1 : r;
}
uint64_t crypt_getphysmemory_kb(void)
{
long pagesize, phys_pages;
uint64_t phys_memory_kb;
pagesize = sysconf(_SC_PAGESIZE);
phys_pages = sysconf(_SC_PHYS_PAGES);
if (pagesize < 0 || phys_pages < 0)
return 0;
phys_memory_kb = pagesize / 1024;
phys_memory_kb *= phys_pages;
return phys_memory_kb;
}
void crypt_process_priority(struct crypt_device *cd, int *priority, bool raise)
{
int _priority, new_priority;
if (raise) {
_priority = getpriority(PRIO_PROCESS, 0);
if (_priority < 0)
_priority = 0;
if (priority)
*priority = _priority;
/*
* Do not bother checking CAP_SYS_NICE as device activation
* requires CAP_SYSADMIN later anyway.
*/
if (getuid() || geteuid())
new_priority = 0;
else
new_priority = -18;
if (setpriority(PRIO_PROCESS, 0, new_priority))
log_dbg(cd, "Cannot raise process priority.");
} else {
_priority = priority ? *priority : 0;
if (setpriority(PRIO_PROCESS, 0, _priority))
log_dbg(cd, "Cannot reset process priority.");
}
}
/* Keyfile processing */
/*
* A simple call to lseek(3) might not be possible for some inputs (e.g.
* reading from a pipe), so this function instead reads of up to BUFSIZ bytes
* at a time until the specified number of bytes. It returns -1 on read error
* or when it reaches EOF before the requested number of bytes have been
* discarded.
*/
static int keyfile_seek(int fd, uint64_t bytes)
{
char tmp[BUFSIZ];
size_t next_read;
ssize_t bytes_r;
off_t r;
r = lseek(fd, bytes, SEEK_CUR);
if (r > 0)
return 0;
if (r < 0 && errno != ESPIPE)
return -1;
while (bytes > 0) {
/* figure out how much to read */
next_read = bytes > sizeof(tmp) ? sizeof(tmp) : (size_t)bytes;
bytes_r = read(fd, tmp, next_read);
if (bytes_r < 0) {
if (errno == EINTR)
continue;
crypt_safe_memzero(tmp, sizeof(tmp));
/* read error */
return -1;
}
if (bytes_r == 0)
/* EOF */
break;
bytes -= bytes_r;
}
crypt_safe_memzero(tmp, sizeof(tmp));
return bytes == 0 ? 0 : -1;
}
int crypt_keyfile_device_read(struct crypt_device *cd, const char *keyfile,
char **key, size_t *key_size_read,
uint64_t keyfile_offset, size_t key_size,
uint32_t flags)
{
int fd, regular_file, char_to_read = 0, char_read = 0, unlimited_read = 0;
int r = -EINVAL, newline;
char *pass = NULL;
size_t buflen, i;
uint64_t file_read_size;
struct stat st;
if (!key || !key_size_read)
return -EINVAL;
*key = NULL;
*key_size_read = 0;
fd = keyfile ? open(keyfile, O_RDONLY) : STDIN_FILENO;
if (fd < 0) {
log_err(cd, _("Failed to open key file."));
return -EINVAL;
}
if (isatty(fd)) {
log_err(cd, _("Cannot read keyfile from a terminal."));
goto out;
}
/* If not requested otherwise, we limit input to prevent memory exhaustion */
if (key_size == 0) {
key_size = DEFAULT_KEYFILE_SIZE_MAXKB * 1024 + 1;
unlimited_read = 1;
/* use 4k for buffer (page divisor but avoid huge pages) */
buflen = 4096 - 16; /* sizeof(struct safe_allocation); */
} else
buflen = key_size;
regular_file = 0;
if (keyfile) {
if (stat(keyfile, &st) < 0) {
log_err(cd, _("Failed to stat key file."));
goto out;
}
if (S_ISREG(st.st_mode)) {
regular_file = 1;
file_read_size = (uint64_t)st.st_size;
if (keyfile_offset > file_read_size) {
log_err(cd, _("Cannot seek to requested keyfile offset."));
goto out;
}
file_read_size -= keyfile_offset;
/* known keyfile size, alloc it in one step */
if (file_read_size >= (uint64_t)key_size)
buflen = key_size;
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."));
goto out;
}
/* Discard keyfile_offset bytes on input */
if (keyfile_offset && keyfile_seek(fd, keyfile_offset) < 0) {
log_err(cd, _("Cannot seek to requested keyfile offset."));
goto out;
}
for (i = 0, newline = 0; i < key_size; i += char_read) {
if (i == buflen) {
buflen += 4096;
pass = crypt_safe_realloc(pass, buflen);
if (!pass) {
log_err(cd, _("Out of memory while reading passphrase."));
r = -ENOMEM;
goto out;
}
}
if (flags & CRYPT_KEYFILE_STOP_EOL) {
/* If we should stop on newline, we must read the input
* one character at the time. Otherwise we might end up
* having read some bytes after the newline, which we
* promised not to do.
*/
char_to_read = 1;
} else {
/* char_to_read = min(key_size - i, buflen - i) */
char_to_read = key_size < buflen ?
key_size - i : buflen - i;
}
char_read = read_buffer(fd, &pass[i], char_to_read);
if (char_read < 0) {
log_err(cd, _("Error reading passphrase."));
r = -EPIPE;
goto out;
}
if (char_read == 0)
break;
/* Stop on newline only if not requested read from keyfile */
if ((flags & CRYPT_KEYFILE_STOP_EOL) && pass[i] == '\n') {
newline = 1;
pass[i] = '\0';
break;
}
}
/* Fail if piped input dies reading nothing */
if (!i && !regular_file && !newline) {
log_err(cd, _("Nothing to read on input."));
r = -EPIPE;
goto out;
}
/* Fail if we exceeded internal default (no specified size) */
if (unlimited_read && i == key_size) {
log_err(cd, _("Maximum keyfile size exceeded."));
goto out;
}
if (!unlimited_read && i != key_size) {
log_err(cd, _("Cannot read requested amount of data."));
goto out;
}
*key = pass;
*key_size_read = i;
r = 0;
out:
if (fd != STDIN_FILENO)
close(fd);
if (r)
crypt_safe_free(pass);
return r;
}
int crypt_keyfile_read(struct crypt_device *cd, const char *keyfile,
char **key, size_t *key_size_read,
size_t keyfile_offset, size_t keyfile_size_max,
uint32_t flags)
{
return crypt_keyfile_device_read(cd, keyfile, key, key_size_read,
keyfile_offset, keyfile_size_max, flags);
}
int kernel_version(uint64_t *kversion)
{
struct utsname uts;
uint16_t maj, min, patch, rel;
int r = -EINVAL;
if (uname(&uts) < 0)
return r;
if (sscanf(uts.release, "%" SCNu16 ".%" SCNu16 ".%" SCNu16 "-%" SCNu16,
&maj, &min, &patch, &rel) == 4)
r = 0;
else if (sscanf(uts.release, "%" SCNu16 ".%" SCNu16 ".%" SCNu16,
&maj, &min, &patch) == 3) {
rel = 0;
r = 0;
}
if (!r)
*kversion = compact_version(maj, min, patch, rel);
return r;
}
bool crypt_string_in(const char *str, char **list, size_t list_size)
{
size_t i;
for (i = 0; *list && i < list_size; i++, list++)
if (!strcmp(str, *list))
return true;
return false;
}
/* compare two strings (allows NULL values) */
int crypt_strcmp(const char *a, const char *b)
{
if (!a && !b)
return 0;
else if (!a || !b)
return 1;
return strcmp(a, b);
}
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