mirror of
git://git.gnupg.org/gnupg.git
synced 2025-07-02 22:46:30 +02:00
This commit was manufactured by cvs2svn to create branch
'GNUPG-1-9-BRANCH'.
This commit is contained in:
parent
eba8c18657
commit
9ca4830a5b
76 changed files with 34899 additions and 0 deletions
359
agent/findkey.c
Normal file
359
agent/findkey.c
Normal file
|
@ -0,0 +1,359 @@
|
|||
/* findkey.c - locate the secret key
|
||||
* Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
|
||||
*
|
||||
* This file is part of GnuPG.
|
||||
*
|
||||
* GnuPG 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.
|
||||
*
|
||||
* GnuPG 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
|
||||
*/
|
||||
|
||||
#include <config.h>
|
||||
#include <errno.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <ctype.h>
|
||||
#include <fcntl.h>
|
||||
#include <assert.h>
|
||||
#include <unistd.h>
|
||||
#include <sys/stat.h>
|
||||
#include <assert.h>
|
||||
|
||||
#include "agent.h"
|
||||
|
||||
/* Helper to pass data to the check callback of the unprotect function. */
|
||||
struct try_unprotect_arg_s {
|
||||
const unsigned char *protected_key;
|
||||
unsigned char *unprotected_key;
|
||||
};
|
||||
|
||||
|
||||
|
||||
int
|
||||
agent_write_private_key (const unsigned char *grip,
|
||||
const void *buffer, size_t length, int force)
|
||||
{
|
||||
int i;
|
||||
char *fname;
|
||||
FILE *fp;
|
||||
char hexgrip[40+4+1];
|
||||
|
||||
for (i=0; i < 20; i++)
|
||||
sprintf (hexgrip+2*i, "%02X", grip[i]);
|
||||
strcpy (hexgrip+40, ".key");
|
||||
|
||||
fname = make_filename (opt.homedir, GNUPG_PRIVATE_KEYS_DIR, hexgrip, NULL);
|
||||
if (force)
|
||||
fp = fopen (fname, "wb");
|
||||
else
|
||||
{
|
||||
int fd;
|
||||
|
||||
if (!access (fname, F_OK))
|
||||
{
|
||||
log_error ("secret key file `%s' already exists\n", fname);
|
||||
xfree (fname);
|
||||
return gpg_error (GPG_ERR_GENERAL);
|
||||
}
|
||||
|
||||
/* We would like to create FNAME but only if it does not already
|
||||
exist. We cannot make this guarantee just using POSIX (GNU
|
||||
provides the "x" opentype for fopen, however, this is not
|
||||
portable). Thus, we use the more flexible open function and
|
||||
then use fdopen to obtain a stream.
|
||||
|
||||
The mode parameter to open is what fopen uses. It will be
|
||||
combined with the process' umask automatically. */
|
||||
fd = open (fname, O_CREAT | O_EXCL | O_RDWR,
|
||||
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
|
||||
if (fd < 0)
|
||||
fp = 0;
|
||||
else
|
||||
{
|
||||
fp = fdopen (fd, "wb");
|
||||
if (!fp)
|
||||
{
|
||||
int save_e = errno;
|
||||
close (fd);
|
||||
errno = save_e;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (!fp)
|
||||
{
|
||||
gpg_error_t tmperr = gpg_error (gpg_err_code_from_errno (errno));
|
||||
log_error ("can't create `%s': %s\n", fname, strerror (errno));
|
||||
xfree (fname);
|
||||
return tmperr;
|
||||
}
|
||||
|
||||
if (fwrite (buffer, length, 1, fp) != 1)
|
||||
{
|
||||
gpg_error_t tmperr = gpg_error (gpg_err_code_from_errno (errno));
|
||||
log_error ("error writing `%s': %s\n", fname, strerror (errno));
|
||||
fclose (fp);
|
||||
remove (fname);
|
||||
xfree (fname);
|
||||
return tmperr;
|
||||
}
|
||||
if ( fclose (fp) )
|
||||
{
|
||||
gpg_error_t tmperr = gpg_error (gpg_err_code_from_errno (errno));
|
||||
log_error ("error closing `%s': %s\n", fname, strerror (errno));
|
||||
remove (fname);
|
||||
xfree (fname);
|
||||
return tmperr;
|
||||
}
|
||||
|
||||
xfree (fname);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/* Callback function to try the unprotection from the passpharse query
|
||||
code. */
|
||||
static int
|
||||
try_unprotect_cb (struct pin_entry_info_s *pi)
|
||||
{
|
||||
struct try_unprotect_arg_s *arg = pi->check_cb_arg;
|
||||
size_t dummy;
|
||||
|
||||
assert (!arg->unprotected_key);
|
||||
return agent_unprotect (arg->protected_key, pi->pin,
|
||||
&arg->unprotected_key, &dummy);
|
||||
}
|
||||
|
||||
|
||||
/* Unprotect the canconical encoded S-expression key in KEYBUF. GRIP
|
||||
should be the hex encoded keygrip of that key to be used with the
|
||||
caching mechanism. */
|
||||
static int
|
||||
unprotect (CTRL ctrl,
|
||||
unsigned char **keybuf, const unsigned char *grip, int ignore_cache)
|
||||
{
|
||||
struct pin_entry_info_s *pi;
|
||||
struct try_unprotect_arg_s arg;
|
||||
int rc, i;
|
||||
unsigned char *result;
|
||||
size_t resultlen;
|
||||
char hexgrip[40+1];
|
||||
|
||||
for (i=0; i < 20; i++)
|
||||
sprintf (hexgrip+2*i, "%02X", grip[i]);
|
||||
hexgrip[40] = 0;
|
||||
|
||||
/* first try to get it from the cache - if there is none or we can't
|
||||
unprotect it, we fall back to ask the user */
|
||||
if (!ignore_cache)
|
||||
{
|
||||
void *cache_marker;
|
||||
const char *pw = agent_get_cache (hexgrip, &cache_marker);
|
||||
if (pw)
|
||||
{
|
||||
rc = agent_unprotect (*keybuf, pw, &result, &resultlen);
|
||||
agent_unlock_cache_entry (&cache_marker);
|
||||
if (!rc)
|
||||
{
|
||||
xfree (*keybuf);
|
||||
*keybuf = result;
|
||||
return 0;
|
||||
}
|
||||
rc = 0;
|
||||
}
|
||||
}
|
||||
|
||||
pi = gcry_calloc_secure (1, sizeof (*pi) + 100);
|
||||
pi->max_length = 100;
|
||||
pi->min_digits = 0; /* we want a real passphrase */
|
||||
pi->max_digits = 8;
|
||||
pi->max_tries = 3;
|
||||
pi->check_cb = try_unprotect_cb;
|
||||
arg.protected_key = *keybuf;
|
||||
arg.unprotected_key = NULL;
|
||||
pi->check_cb_arg = &arg;
|
||||
|
||||
rc = agent_askpin (ctrl, NULL, pi);
|
||||
if (!rc)
|
||||
{
|
||||
assert (arg.unprotected_key);
|
||||
agent_put_cache (hexgrip, pi->pin, 0);
|
||||
xfree (*keybuf);
|
||||
*keybuf = arg.unprotected_key;
|
||||
}
|
||||
xfree (pi);
|
||||
return rc;
|
||||
}
|
||||
|
||||
|
||||
|
||||
/* Return the secret key as an S-Exp after locating it using the grip.
|
||||
Returns NULL if key is not available or the operation should be
|
||||
diverted to a token. In the latter case shadow_info will point to
|
||||
an allocated S-Expression with the shadow_info part from the file.
|
||||
With IGNORE_CACHE passed as true the passphrase is not taken from
|
||||
the cache.*/
|
||||
gcry_sexp_t
|
||||
agent_key_from_file (CTRL ctrl,
|
||||
const unsigned char *grip, unsigned char **shadow_info,
|
||||
int ignore_cache)
|
||||
{
|
||||
int i, rc;
|
||||
char *fname;
|
||||
FILE *fp;
|
||||
struct stat st;
|
||||
unsigned char *buf;
|
||||
size_t len, buflen, erroff;
|
||||
gcry_sexp_t s_skey;
|
||||
char hexgrip[40+4+1];
|
||||
|
||||
if (shadow_info)
|
||||
*shadow_info = NULL;
|
||||
|
||||
for (i=0; i < 20; i++)
|
||||
sprintf (hexgrip+2*i, "%02X", grip[i]);
|
||||
strcpy (hexgrip+40, ".key");
|
||||
|
||||
fname = make_filename (opt.homedir, GNUPG_PRIVATE_KEYS_DIR, hexgrip, NULL);
|
||||
fp = fopen (fname, "rb");
|
||||
if (!fp)
|
||||
{
|
||||
log_error ("can't open `%s': %s\n", fname, strerror (errno));
|
||||
xfree (fname);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (fstat (fileno(fp), &st))
|
||||
{
|
||||
log_error ("can't stat `%s': %s\n", fname, strerror (errno));
|
||||
xfree (fname);
|
||||
fclose (fp);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
buflen = st.st_size;
|
||||
buf = xmalloc (buflen+1);
|
||||
if (fread (buf, buflen, 1, fp) != 1)
|
||||
{
|
||||
log_error ("error reading `%s': %s\n", fname, strerror (errno));
|
||||
xfree (fname);
|
||||
fclose (fp);
|
||||
xfree (buf);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
rc = gcry_sexp_sscan (&s_skey, &erroff, buf, buflen);
|
||||
xfree (fname);
|
||||
fclose (fp);
|
||||
xfree (buf);
|
||||
if (rc)
|
||||
{
|
||||
log_error ("failed to build S-Exp (off=%u): %s\n",
|
||||
(unsigned int)erroff, gpg_strerror (rc));
|
||||
return NULL;
|
||||
}
|
||||
len = gcry_sexp_sprint (s_skey, GCRYSEXP_FMT_CANON, NULL, 0);
|
||||
assert (len);
|
||||
buf = xtrymalloc (len);
|
||||
if (!buf)
|
||||
{
|
||||
gcry_sexp_release (s_skey);
|
||||
return NULL;
|
||||
}
|
||||
len = gcry_sexp_sprint (s_skey, GCRYSEXP_FMT_CANON, buf, len);
|
||||
assert (len);
|
||||
gcry_sexp_release (s_skey);
|
||||
|
||||
switch (agent_private_key_type (buf))
|
||||
{
|
||||
case PRIVATE_KEY_CLEAR:
|
||||
break; /* no unprotection needed */
|
||||
case PRIVATE_KEY_PROTECTED:
|
||||
rc = unprotect (ctrl, &buf, grip, ignore_cache);
|
||||
if (rc)
|
||||
log_error ("failed to unprotect the secret key: %s\n",
|
||||
gpg_strerror (rc));
|
||||
break;
|
||||
case PRIVATE_KEY_SHADOWED:
|
||||
if (shadow_info)
|
||||
{
|
||||
const unsigned char *s;
|
||||
size_t n;
|
||||
|
||||
rc = agent_get_shadow_info (buf, &s);
|
||||
if (!rc)
|
||||
{
|
||||
n = gcry_sexp_canon_len (s, 0, NULL,NULL);
|
||||
assert (n);
|
||||
*shadow_info = xtrymalloc (n);
|
||||
if (!*shadow_info)
|
||||
rc = out_of_core ();
|
||||
else
|
||||
{
|
||||
memcpy (*shadow_info, s, n);
|
||||
rc = 0;
|
||||
}
|
||||
}
|
||||
if (rc)
|
||||
log_error ("get_shadow_info failed: %s\n", gpg_strerror (rc));
|
||||
}
|
||||
rc = -1; /* ugly interface: we return an error but keep a value
|
||||
in shadow_info. */
|
||||
break;
|
||||
default:
|
||||
log_error ("invalid private key format\n");
|
||||
rc = gpg_error (GPG_ERR_BAD_SECKEY);
|
||||
break;
|
||||
}
|
||||
if (rc)
|
||||
{
|
||||
xfree (buf);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* arggg FIXME: does scan support secure memory? */
|
||||
rc = gcry_sexp_sscan (&s_skey, &erroff,
|
||||
buf, gcry_sexp_canon_len (buf, 0, NULL, NULL));
|
||||
xfree (buf);
|
||||
if (rc)
|
||||
{
|
||||
log_error ("failed to build S-Exp (off=%u): %s\n",
|
||||
(unsigned int)erroff, gpg_strerror (rc));
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return s_skey;
|
||||
}
|
||||
|
||||
/* Return the secret key as an S-Exp after locating it using the grip.
|
||||
Returns NULL if key is not available. 0 = key is available */
|
||||
int
|
||||
agent_key_available (const unsigned char *grip)
|
||||
{
|
||||
int i;
|
||||
char *fname;
|
||||
char hexgrip[40+4+1];
|
||||
|
||||
for (i=0; i < 20; i++)
|
||||
sprintf (hexgrip+2*i, "%02X", grip[i]);
|
||||
strcpy (hexgrip+40, ".key");
|
||||
|
||||
fname = make_filename (opt.homedir, GNUPG_PRIVATE_KEYS_DIR, hexgrip, NULL);
|
||||
i = !access (fname, R_OK)? 0 : -1;
|
||||
xfree (fname);
|
||||
return i;
|
||||
}
|
||||
|
||||
|
||||
|
Loading…
Add table
Add a link
Reference in a new issue