mirror of
git://git.gnupg.org/gnupg.git
synced 2024-11-10 21:38:50 +01:00
0d4b205630
* stringhelp.c (utf8_charcount): New. agent/ * genkey.c (check_passphrase_constraints): Use UTF-8 aware strlen.
314 lines
8.1 KiB
C
314 lines
8.1 KiB
C
/* pksign.c - Generate a keypair
|
||
* Copyright (C) 2002, 2003, 2004 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
|
||
* USA.
|
||
*/
|
||
|
||
#include <config.h>
|
||
#include <errno.h>
|
||
#include <stdio.h>
|
||
#include <stdlib.h>
|
||
#include <string.h>
|
||
#include <ctype.h>
|
||
#include <assert.h>
|
||
|
||
#include "agent.h"
|
||
#include "i18n.h"
|
||
|
||
static int
|
||
store_key (gcry_sexp_t private, const char *passphrase, int force)
|
||
{
|
||
int rc;
|
||
unsigned char *buf;
|
||
size_t len;
|
||
unsigned char grip[20];
|
||
|
||
if ( !gcry_pk_get_keygrip (private, grip) )
|
||
{
|
||
log_error ("can't calculate keygrip\n");
|
||
return gpg_error (GPG_ERR_GENERAL);
|
||
}
|
||
|
||
len = gcry_sexp_sprint (private, GCRYSEXP_FMT_CANON, NULL, 0);
|
||
assert (len);
|
||
buf = gcry_malloc_secure (len);
|
||
if (!buf)
|
||
return out_of_core ();
|
||
len = gcry_sexp_sprint (private, GCRYSEXP_FMT_CANON, buf, len);
|
||
assert (len);
|
||
|
||
if (passphrase)
|
||
{
|
||
unsigned char *p;
|
||
|
||
rc = agent_protect (buf, passphrase, &p, &len);
|
||
if (rc)
|
||
{
|
||
xfree (buf);
|
||
return rc;
|
||
}
|
||
xfree (buf);
|
||
buf = p;
|
||
}
|
||
|
||
rc = agent_write_private_key (grip, buf, len, force);
|
||
xfree (buf);
|
||
return rc;
|
||
}
|
||
|
||
|
||
/* Check whether the passphrase PW is suitable. Returns 0 if the
|
||
passphrase is suitable and true if it is not and the user should be
|
||
asked to provide a different one. */
|
||
int
|
||
check_passphrase_constraints (ctrl_t ctrl, const char *pw)
|
||
{
|
||
gpg_error_t err;
|
||
unsigned int minlen = opt.min_passphrase_len;
|
||
|
||
if (!pw)
|
||
pw = "";
|
||
|
||
if (utf8_charcount (pw) < minlen )
|
||
{
|
||
char *desc = xtryasprintf
|
||
( ngettext ("Warning: You have entered a passphrase that%%0A"
|
||
"is obviously not secure. A passphrase should%%0A"
|
||
"be at least %u character long.",
|
||
"Warning: You have entered a passphrase that%%0A"
|
||
"is obviously not secure. A passphrase should%%0A"
|
||
"be at least %u characters long.", minlen), minlen );
|
||
if (!desc)
|
||
return gpg_error_from_syserror ();
|
||
|
||
err = agent_get_confirmation (ctrl, desc,
|
||
_("Take this one anyway"),
|
||
_("Enter new passphrase"));
|
||
xfree (desc);
|
||
if (err)
|
||
return err;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Callback function to compare the first entered PIN with the one
|
||
currently being entered. */
|
||
static int
|
||
reenter_compare_cb (struct pin_entry_info_s *pi)
|
||
{
|
||
const char *pin1 = pi->check_cb_arg;
|
||
|
||
if (!strcmp (pin1, pi->pin))
|
||
return 0; /* okay */
|
||
return -1;
|
||
}
|
||
|
||
|
||
|
||
/* Generate a new keypair according to the parameters given in
|
||
KEYPARAM */
|
||
int
|
||
agent_genkey (ctrl_t ctrl, const char *keyparam, size_t keyparamlen,
|
||
membuf_t *outbuf)
|
||
{
|
||
gcry_sexp_t s_keyparam, s_key, s_private, s_public;
|
||
struct pin_entry_info_s *pi, *pi2;
|
||
int rc;
|
||
size_t len;
|
||
char *buf;
|
||
|
||
rc = gcry_sexp_sscan (&s_keyparam, NULL, keyparam, keyparamlen);
|
||
if (rc)
|
||
{
|
||
log_error ("failed to convert keyparam: %s\n", gpg_strerror (rc));
|
||
return gpg_error (GPG_ERR_INV_DATA);
|
||
}
|
||
|
||
/* Get the passphrase now, cause key generation may take a while. */
|
||
{
|
||
const char *text1 = _("Please enter the passphrase to%0A"
|
||
"to protect your new key");
|
||
const char *text2 = _("Please re-enter this passphrase");
|
||
const char *initial_errtext = NULL;
|
||
|
||
pi = gcry_calloc_secure (2, sizeof (*pi) + 100);
|
||
pi2 = pi + (sizeof *pi + 100);
|
||
pi->max_length = 100;
|
||
pi->max_tries = 3;
|
||
pi2->max_length = 100;
|
||
pi2->max_tries = 3;
|
||
pi2->check_cb = reenter_compare_cb;
|
||
pi2->check_cb_arg = pi->pin;
|
||
|
||
next_try:
|
||
rc = agent_askpin (ctrl, text1, NULL, initial_errtext, pi);
|
||
initial_errtext = NULL;
|
||
if (!rc)
|
||
{
|
||
if (check_passphrase_constraints (ctrl, pi->pin))
|
||
{
|
||
pi->failed_tries = 0;
|
||
pi2->failed_tries = 0;
|
||
goto next_try;
|
||
}
|
||
rc = agent_askpin (ctrl, text2, NULL, NULL, pi2);
|
||
if (rc == -1)
|
||
{ /* The re-entered one did not match and the user did not
|
||
hit cancel. */
|
||
initial_errtext = _("does not match - try again");
|
||
goto next_try;
|
||
}
|
||
}
|
||
if (rc)
|
||
{
|
||
xfree (pi);
|
||
return rc;
|
||
}
|
||
|
||
if (!*pi->pin)
|
||
{
|
||
xfree (pi);
|
||
pi = NULL; /* User does not want a passphrase. */
|
||
}
|
||
}
|
||
|
||
rc = gcry_pk_genkey (&s_key, s_keyparam );
|
||
gcry_sexp_release (s_keyparam);
|
||
if (rc)
|
||
{
|
||
log_error ("key generation failed: %s\n", gpg_strerror (rc));
|
||
xfree (pi);
|
||
return rc;
|
||
}
|
||
|
||
/* break out the parts */
|
||
s_private = gcry_sexp_find_token (s_key, "private-key", 0);
|
||
if (!s_private)
|
||
{
|
||
log_error ("key generation failed: invalid return value\n");
|
||
gcry_sexp_release (s_key);
|
||
xfree (pi);
|
||
return gpg_error (GPG_ERR_INV_DATA);
|
||
}
|
||
s_public = gcry_sexp_find_token (s_key, "public-key", 0);
|
||
if (!s_public)
|
||
{
|
||
log_error ("key generation failed: invalid return value\n");
|
||
gcry_sexp_release (s_private);
|
||
gcry_sexp_release (s_key);
|
||
xfree (pi);
|
||
return gpg_error (GPG_ERR_INV_DATA);
|
||
}
|
||
gcry_sexp_release (s_key); s_key = NULL;
|
||
|
||
/* store the secret key */
|
||
if (DBG_CRYPTO)
|
||
log_debug ("storing private key\n");
|
||
rc = store_key (s_private, pi? pi->pin:NULL, 0);
|
||
xfree (pi); pi = NULL;
|
||
gcry_sexp_release (s_private);
|
||
if (rc)
|
||
{
|
||
gcry_sexp_release (s_public);
|
||
return rc;
|
||
}
|
||
|
||
/* return the public key */
|
||
if (DBG_CRYPTO)
|
||
log_debug ("returning public key\n");
|
||
len = gcry_sexp_sprint (s_public, GCRYSEXP_FMT_CANON, NULL, 0);
|
||
assert (len);
|
||
buf = xtrymalloc (len);
|
||
if (!buf)
|
||
{
|
||
gpg_error_t tmperr = out_of_core ();
|
||
gcry_sexp_release (s_private);
|
||
gcry_sexp_release (s_public);
|
||
return tmperr;
|
||
}
|
||
len = gcry_sexp_sprint (s_public, GCRYSEXP_FMT_CANON, buf, len);
|
||
assert (len);
|
||
put_membuf (outbuf, buf, len);
|
||
gcry_sexp_release (s_public);
|
||
xfree (buf);
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
|
||
/* Apply a new passpahrse to the key S_SKEY and store it. */
|
||
int
|
||
agent_protect_and_store (ctrl_t ctrl, gcry_sexp_t s_skey)
|
||
{
|
||
struct pin_entry_info_s *pi, *pi2;
|
||
int rc;
|
||
|
||
{
|
||
const char *text1 = _("Please enter the new passphrase");
|
||
const char *text2 = _("Please re-enter this passphrase");
|
||
const char *initial_errtext = NULL;
|
||
|
||
pi = gcry_calloc_secure (2, sizeof (*pi) + 100);
|
||
pi2 = pi + (sizeof *pi + 100);
|
||
pi->max_length = 100;
|
||
pi->max_tries = 3;
|
||
pi2->max_length = 100;
|
||
pi2->max_tries = 3;
|
||
pi2->check_cb = reenter_compare_cb;
|
||
pi2->check_cb_arg = pi->pin;
|
||
|
||
next_try:
|
||
rc = agent_askpin (ctrl, text1, NULL, initial_errtext, pi);
|
||
initial_errtext = NULL;
|
||
if (!rc)
|
||
{
|
||
if (check_passphrase_constraints (ctrl, pi->pin))
|
||
{
|
||
pi->failed_tries = 0;
|
||
pi2->failed_tries = 0;
|
||
goto next_try;
|
||
}
|
||
rc = agent_askpin (ctrl, text2, NULL, NULL, pi2);
|
||
if (rc == -1)
|
||
{ /* The re-entered one did not match and the user did not
|
||
hit cancel. */
|
||
initial_errtext = _("does not match - try again");
|
||
goto next_try;
|
||
}
|
||
}
|
||
if (rc)
|
||
{
|
||
xfree (pi);
|
||
return rc;
|
||
}
|
||
|
||
if (!*pi->pin)
|
||
{
|
||
xfree (pi);
|
||
pi = NULL; /* User does not want a passphrase. */
|
||
}
|
||
}
|
||
|
||
rc = store_key (s_skey, pi? pi->pin:NULL, 1);
|
||
xfree (pi);
|
||
return 0;
|
||
}
|