+/*
+ * 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) 2009-2012, Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2009-2012, 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 <string.h>
#include <stdlib.h>
-#include <stddef.h>
-#include <stdarg.h>
#include <errno.h>
-#include <linux/fs.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/ioctl.h>
-#include <fcntl.h>
-#include <termios.h>
-
-#include "libcryptsetup.h"
-#include "internal.h"
-
-
-struct safe_allocation {
- size_t size;
- char data[1];
-};
-
-static char *error=NULL;
+#include <sys/mman.h>
+#include <sys/resource.h>
-void set_error_va(const char *fmt, va_list va)
-{
-
- if(error) {
- free(error);
- error=NULL;
- }
-
- if(!fmt) return;
-
- if (vasprintf(&error, fmt, va) < 0) {
- free(error);
- error = NULL;
- }
-}
-
-void set_error(const char *fmt, ...)
-{
- va_list va;
-
- va_start(va, fmt);
- set_error_va(fmt, va);
- va_end(va);
-}
-
-const char *get_error(void)
-{
- return error;
-}
-
-void *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 safe_free(void *data)
-{
- struct safe_allocation *alloc;
-
- if (!data)
- return;
-
- alloc = data - offsetof(struct safe_allocation, data);
-
- memset(data, 0, alloc->size);
-
- alloc->size = 0x55aa55aa;
- free(alloc);
-}
-
-void *safe_realloc(void *data, size_t size)
-{
- void *new_data;
-
- new_data = safe_alloc(size);
-
- if (new_data && data) {
- struct safe_allocation *alloc;
-
- alloc = data - offsetof(struct safe_allocation, data);
-
- if (size > alloc->size)
- size = alloc->size;
-
- memcpy(new_data, data, size);
- }
-
- safe_free(data);
- return new_data;
-}
+#include "internal.h"
-char *safe_strdup(const char *s)
+unsigned crypt_getpagesize(void)
{
- char *s2 = safe_alloc(strlen(s) + 1);
-
- if (!s2)
- return NULL;
-
- return strcpy(s2, s);
+ long r = sysconf(_SC_PAGESIZE);
+ return r < 0 ? DEFAULT_MEM_ALIGNMENT : r;
}
static int get_alignment(int fd)
{
- int alignment = DEFAULT_ALIGNMENT;
+ int alignment = DEFAULT_MEM_ALIGNMENT;
#ifdef _PC_REC_XFER_ALIGN
alignment = fpathconf(fd, _PC_REC_XFER_ALIGN);
if (alignment < 0)
- alignment = DEFAULT_ALIGNMENT;
+ alignment = DEFAULT_MEM_ALIGNMENT;
#endif
return alignment;
}
return ptr;
#endif
}
-static int sector_size(int fd)
-{
- int bsize;
- if (ioctl(fd,BLKSSZGET, &bsize) < 0)
- return -EINVAL;
- else
- return bsize;
-}
-
-int sector_size_for_device(const char *device)
-{
- int fd = open(device, O_RDONLY);
- int r;
- if(fd < 0)
- return -EINVAL;
- r = sector_size(fd);
- close(fd);
- return r;
-}
-ssize_t write_blockwise(int fd, const void *orig_buf, size_t count)
+ssize_t write_blockwise(int fd, int bsize, void *orig_buf, size_t count)
{
void *hangover_buf, *hangover_buf_base = NULL;
void *buf, *buf_base = NULL;
- int r, hangover, solid, bsize, alignment;
+ int r, hangover, solid, alignment;
ssize_t ret = -1;
- if ((bsize = sector_size(fd)) < 0)
- return bsize;
+ if (fd == -1 || !orig_buf || bsize <= 0)
+ return -1;
hangover = count % bsize;
solid = count - hangover;
goto out;
memcpy(buf, orig_buf, count);
} else
- buf = (void *)orig_buf;
+ buf = orig_buf;
r = write(fd, buf, solid);
if (r < 0 || r != solid)
goto out;
r = read(fd, hangover_buf, bsize);
- if(r < 0 || r != bsize) goto out;
+ if (r < 0 || r < hangover)
+ goto out;
+
+ if (r < bsize)
+ bsize = r;
r = lseek(fd, -bsize, SEEK_CUR);
if (r < 0)
goto out;
- memcpy(hangover_buf, buf + solid, hangover);
+ memcpy(hangover_buf, (char*)buf + solid, hangover);
r = write(fd, hangover_buf, bsize);
- if(r < 0 || r != bsize) goto out;
- free(hangover_buf_base);
+ if (r < 0 || r < hangover)
+ goto out;
}
ret = count;
- out:
+out:
+ free(hangover_buf_base);
if (buf != orig_buf)
free(buf_base);
return ret;
}
-ssize_t read_blockwise(int fd, void *orig_buf, size_t count) {
- void *hangover_buf, *hangover_buf_base;
+ssize_t read_blockwise(int fd, int bsize, void *orig_buf, size_t count) {
+ void *hangover_buf, *hangover_buf_base = NULL;
void *buf, *buf_base = NULL;
- int r, hangover, solid, bsize, alignment;
+ int r, hangover, solid, alignment;
ssize_t ret = -1;
- if ((bsize = sector_size(fd)) < 0)
- return bsize;
+ if (fd == -1 || !orig_buf || bsize <= 0)
+ return -1;
hangover = count % bsize;
solid = count - hangover;
if ((long)orig_buf & (alignment - 1)) {
buf = aligned_malloc(&buf_base, count, alignment);
if (!buf)
- goto out;
+ return -1;
} else
buf = orig_buf;
r = read(fd, buf, solid);
- if(r < 0 || r != solid) {
- set_error("read failed in read_blockwise.\n");
+ if(r < 0 || r != solid)
goto out;
- }
if (hangover) {
hangover_buf = aligned_malloc(&hangover_buf_base, bsize, alignment);
if (!hangover_buf)
goto out;
r = read(fd, hangover_buf, bsize);
- if (r < 0 || r != bsize)
+ if (r < 0 || r < hangover)
goto out;
- memcpy(buf + solid, hangover_buf, hangover);
- free(hangover_buf_base);
+ memcpy((char *)buf + solid, hangover_buf, hangover);
}
ret = count;
- out:
+out:
+ free(hangover_buf_base);
if (buf != orig_buf) {
memcpy(orig_buf, buf, count);
free(buf_base);
return ret;
}
-/*
+/*
* Combines llseek with blockwise write. write_blockwise can already deal with short writes
* but we also need a function to deal with short writes at the start. But this information
- * is implicitly included in the read/write offset, which can not be set to non-aligned
+ * is implicitly included in the read/write offset, which can not be set to non-aligned
* boundaries. Hence, we combine llseek with write.
*/
+ssize_t write_lseek_blockwise(int fd, int bsize, char *buf, size_t count, off_t offset) {
+ char *frontPadBuf;
+ void *frontPadBuf_base = NULL;
+ int r, frontHang;
+ size_t innerCount = 0;
+ ssize_t ret = -1;
-ssize_t write_lseek_blockwise(int fd, const char *buf, size_t count, off_t offset) {
- int bsize = sector_size(fd);
- const char *orig_buf = buf;
- char frontPadBuf[bsize];
- int frontHang = offset % bsize;
- int r;
- int innerCount = count < bsize ? count : bsize;
-
- if (bsize < 0)
- return bsize;
-
- lseek(fd, offset - frontHang, SEEK_SET);
- if(offset % bsize) {
- r = read(fd,frontPadBuf,bsize);
- if(r < 0) return -1;
+ if (fd == -1 || !buf || bsize <= 0)
+ return -1;
- memcpy(frontPadBuf+frontHang, buf, innerCount);
+ frontHang = offset % bsize;
- lseek(fd, offset - frontHang, SEEK_SET);
- r = write(fd,frontPadBuf,bsize);
- if(r < 0) return -1;
+ if (lseek(fd, offset - frontHang, SEEK_SET) < 0)
+ goto out;
- buf += innerCount;
- count -= innerCount;
- }
- if(count <= 0) return buf - orig_buf;
+ if (frontHang) {
+ frontPadBuf = aligned_malloc(&frontPadBuf_base,
+ bsize, get_alignment(fd));
+ if (!frontPadBuf)
+ goto out;
- return write_blockwise(fd, buf, count) + innerCount;
-}
+ r = read(fd, frontPadBuf, bsize);
+ if (r < 0 || r != bsize)
+ goto out;
-/* Password reading helpers */
+ innerCount = bsize - frontHang;
+ if (innerCount > count)
+ innerCount = count;
-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;
-}
+ memcpy(frontPadBuf + frontHang, buf, innerCount);
-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);
- else
- set_error("Operation timed out");
- 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 (lseek(fd, offset - frontHang, SEEK_SET) < 0)
+ goto out;
- if (maxlen < 1)
- goto out_err;
+ r = write(fd, frontPadBuf, bsize);
+ if (r < 0 || r != bsize)
+ goto out;
- /* Read and write to /dev/tty if available */
- if ((infd = outfd = open("/dev/tty", O_RDWR)) == -1) {
- infd = STDIN_FILENO;
- outfd = STDERR_FILENO;
+ buf += innerCount;
+ count -= innerCount;
}
- if (tcgetattr(infd, &orig)) {
- set_error("Unable to get terminal");
- goto out_err;
- }
- memcpy(&tmp, &orig, sizeof(tmp));
- tmp.c_lflag &= ~ECHO;
-
- if (write(outfd, prompt, strlen(prompt)) < 0)
- goto out_err;
-
- tcsetattr(infd, TCSAFLUSH, &tmp);
- if (timeout)
- failed = timed_read(infd, pass, maxlen, timeout);
- else
- failed = untimed_read(infd, pass, maxlen);
- tcsetattr(infd, TCSAFLUSH, &orig);
-
-out_err:
- if (!failed)
- (void)write(outfd, "\n", 1);
- if (infd != STDIN_FILENO)
- close(infd);
- return failed;
+ ret = count ? write_blockwise(fd, bsize, buf, count) : 0;
+ if (ret >= 0)
+ ret += innerCount;
+out:
+ free(frontPadBuf_base);
+
+ return ret;
}
-/*
- * Password reading behaviour matrix of get_key
- *
- * p v n h
- * -----------------+---+---+---+---
- * interactive | Y | Y | Y | Inf
- * from fd | N | N | Y | Inf
- * from binary file | N | N | N | Inf or options->key_size
- *
- * Legend: p..prompt, v..can verify, n..newline-stop, h..read horizon
- *
- * Note: --key-file=- is interpreted as a read from a binary file (stdin)
- *
- * Returns true when more keys are available (that is when password
- * reading can be retried as for interactive terminals).
- */
+/* MEMLOCK */
+#define DEFAULT_PROCESS_PRIORITY -18
+
+static int _priority;
+static int _memlock_count = 0;
-int get_key(char *prompt, char **key, unsigned int *passLen, int key_size,
- const char *key_file, int passphrase_fd, int timeout, int how2verify)
+// return 1 if memory is locked
+int crypt_memlock_inc(struct crypt_device *ctx)
{
- int fd;
- const int verify = how2verify & CRYPT_FLAG_VERIFY;
- const int verify_if_possible = how2verify & CRYPT_FLAG_VERIFY_IF_POSSIBLE;
- char *pass = NULL;
- int newline_stop;
- int read_horizon;
-
- if(key_file && !strcmp(key_file, "-")) {
- /* Allow binary reading from stdin */
- fd = passphrase_fd;
- newline_stop = 0;
- read_horizon = 0;
- } else if (key_file) {
- fd = open(key_file, O_RDONLY);
- if (fd < 0) {
- char buf[128];
- set_error("Error opening key file: %s",
- strerror_r(errno, buf, 128));
- goto out_err;
+ if (!_memlock_count++) {
+ log_dbg("Locking memory.");
+ if (mlockall(MCL_CURRENT | MCL_FUTURE) == -1) {
+ log_dbg("Cannot lock memory with mlockall.");
+ _memlock_count--;
+ return 0;
}
- newline_stop = 0;
-
- /* This can either be 0 (LUKS) or the actually number
- * of key bytes (default or passed by -s) */
- read_horizon = key_size;
- } else {
- fd = passphrase_fd;
- newline_stop = 1;
- read_horizon = 0; /* Infinite, if read from terminal or fd */
+ errno = 0;
+ if (((_priority = getpriority(PRIO_PROCESS, 0)) == -1) && errno)
+ log_err(ctx, _("Cannot get process priority.\n"));
+ else
+ if (setpriority(PRIO_PROCESS, 0, DEFAULT_PROCESS_PRIORITY))
+ log_dbg("setpriority %d failed: %s",
+ DEFAULT_PROCESS_PRIORITY, strerror(errno));
}
+ return _memlock_count ? 1 : 0;
+}
- /* Interactive case */
- if(isatty(fd)) {
- int i;
-
- pass = safe_alloc(512);
- if (!pass || (i = interactive_pass(prompt, pass, 512, timeout))) {
- set_error("Error reading passphrase");
- goto out_err;
- }
- if (verify || verify_if_possible) {
- char pass_verify[512];
- i = interactive_pass("Verify passphrase: ", pass_verify, sizeof(pass_verify), timeout);
- if (i || strcmp(pass, pass_verify) != 0) {
- set_error("Passphrases do not match");
- goto out_err;
- }
- memset(pass_verify, 0, sizeof(pass_verify));
- }
- *passLen = strlen(pass);
- *key = pass;
- } else {
- /*
- * This is either a fd-input or a file, in neither case we can verify the input,
- * however we don't stop on new lines if it's a binary file.
- */
- int buflen, i;
-
- if(verify) {
- set_error("Can't do passphrase verification on non-tty inputs");
- goto out_err;
- }
- /* The following for control loop does an exhausting
- * read on the key material file, if requested with
- * key_size == 0, as it's done by LUKS. However, we
- * should warn the user, if it's a non-regular file,
- * such as /dev/random, because in this case, the loop
- * will read forever.
- */
- if(key_file && strcmp(key_file, "-") && read_horizon == 0) {
- struct stat st;
- if(stat(key_file, &st) < 0) {
- set_error("Can't stat key file");
- goto out_err;
- }
- if(!S_ISREG(st.st_mode)) {
- // set_error("Can't do exhausting read on non regular files");
- // goto out_err;
- fprintf(stderr,"Warning: exhausting read requested, but key file is not a regular file, function might never return.\n");
- }
- }
- buflen = 0;
- for(i = 0; read_horizon == 0 || i < read_horizon; i++) {
- if(i >= buflen - 1) {
- buflen += 128;
- pass = safe_realloc(pass, buflen);
- if (!pass) {
- set_error("Not enough memory while "
- "reading passphrase");
- goto out_err;
- }
- }
- if(read(fd, pass + i, 1) != 1 || (newline_stop && pass[i] == '\n'))
- break;
- }
- if(key_file)
- close(fd);
- pass[i] = 0;
- *key = pass;
- *passLen = i;
+int crypt_memlock_dec(struct crypt_device *ctx)
+{
+ if (_memlock_count && (!--_memlock_count)) {
+ log_dbg("Unlocking memory.");
+ if (munlockall() == -1)
+ log_err(ctx, _("Cannot unlock memory.\n"));
+ if (setpriority(PRIO_PROCESS, 0, _priority))
+ log_dbg("setpriority %d failed: %s", _priority, strerror(errno));
}
-
- return isatty(fd); /* Return true, when password reading can be tried on interactive fds */
-
-out_err:
- if(pass)
- safe_free(pass);
- *key = NULL;
- *passLen = 0;
- return 0;
+ return _memlock_count ? 1 : 0;
}
-
projects / platform / upstream / cryptsetup.git / blobdiff