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333 lines
8.7 KiB
C
333 lines
8.7 KiB
C
/* pksign.c - Generate a keypair
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* Copyright (C) 2002, 2003, 2004, 2007 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <assert.h>
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#include "agent.h"
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#include "i18n.h"
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static int
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store_key (gcry_sexp_t private, const char *passphrase, int force)
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{
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int rc;
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unsigned char *buf;
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size_t len;
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unsigned char grip[20];
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if ( !gcry_pk_get_keygrip (private, grip) )
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{
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log_error ("can't calculate keygrip\n");
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return gpg_error (GPG_ERR_GENERAL);
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}
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len = gcry_sexp_sprint (private, GCRYSEXP_FMT_CANON, NULL, 0);
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assert (len);
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buf = gcry_malloc_secure (len);
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if (!buf)
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return out_of_core ();
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len = gcry_sexp_sprint (private, GCRYSEXP_FMT_CANON, buf, len);
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assert (len);
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if (passphrase)
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{
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unsigned char *p;
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rc = agent_protect (buf, passphrase, &p, &len);
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if (rc)
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{
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xfree (buf);
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return rc;
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}
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xfree (buf);
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buf = p;
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}
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rc = agent_write_private_key (grip, buf, len, force);
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xfree (buf);
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return rc;
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}
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/* Check whether the passphrase PW is suitable. Returns 0 if the
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passphrase is suitable and true if it is not and the user should be
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asked to provide a different one. */
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int
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check_passphrase_constraints (ctrl_t ctrl, const char *pw)
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{
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gpg_error_t err;
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unsigned int minlen = opt.min_passphrase_len;
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if (!pw)
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pw = "";
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if (utf8_charcount (pw) < minlen )
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{
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char *desc = xtryasprintf
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( ngettext ("Warning: You have entered a passphrase that%%0A"
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"is obviously not secure. A passphrase should%%0A"
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"be at least %u character long.",
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"Warning: You have entered a passphrase that%%0A"
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"is obviously not secure. A passphrase should%%0A"
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"be at least %u characters long.", minlen), minlen );
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if (!desc)
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return gpg_error_from_syserror ();
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err = agent_get_confirmation (ctrl, desc,
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_("Take this one anyway"),
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_("Enter new passphrase"));
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xfree (desc);
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if (err)
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return err;
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}
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if (!*pw)
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{
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const char *desc = _("You have not entered a passphrase - "
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"this is in general a bad idea!%0A"
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"Please confirm that you do not want to "
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"have any protection on your key.");
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err = agent_get_confirmation (ctrl, desc,
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_("Yes, protection is not needed"),
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_("Enter new passphrase"));
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if (err)
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return err;
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}
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return 0;
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}
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/* Callback function to compare the first entered PIN with the one
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currently being entered. */
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static int
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reenter_compare_cb (struct pin_entry_info_s *pi)
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{
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const char *pin1 = pi->check_cb_arg;
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if (!strcmp (pin1, pi->pin))
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return 0; /* okay */
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return -1;
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}
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/* Generate a new keypair according to the parameters given in
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KEYPARAM */
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int
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agent_genkey (ctrl_t ctrl, const char *keyparam, size_t keyparamlen,
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membuf_t *outbuf)
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{
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gcry_sexp_t s_keyparam, s_key, s_private, s_public;
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struct pin_entry_info_s *pi, *pi2;
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int rc;
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size_t len;
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char *buf;
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rc = gcry_sexp_sscan (&s_keyparam, NULL, keyparam, keyparamlen);
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if (rc)
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{
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log_error ("failed to convert keyparam: %s\n", gpg_strerror (rc));
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return gpg_error (GPG_ERR_INV_DATA);
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}
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/* Get the passphrase now, cause key generation may take a while. */
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{
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const char *text1 = _("Please enter the passphrase to%0A"
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"to protect your new key");
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const char *text2 = _("Please re-enter this passphrase");
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const char *initial_errtext = NULL;
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pi = gcry_calloc_secure (2, sizeof (*pi) + 100);
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pi2 = pi + (sizeof *pi + 100);
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pi->max_length = 100;
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pi->max_tries = 3;
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pi2->max_length = 100;
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pi2->max_tries = 3;
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pi2->check_cb = reenter_compare_cb;
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pi2->check_cb_arg = pi->pin;
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next_try:
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rc = agent_askpin (ctrl, text1, NULL, initial_errtext, pi);
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initial_errtext = NULL;
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if (!rc)
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{
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if (check_passphrase_constraints (ctrl, pi->pin))
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{
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pi->failed_tries = 0;
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pi2->failed_tries = 0;
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goto next_try;
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}
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if (pi->pin && *pi->pin)
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{
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rc = agent_askpin (ctrl, text2, NULL, NULL, pi2);
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if (rc == -1)
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{ /* The re-entered one did not match and the user did not
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hit cancel. */
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initial_errtext = _("does not match - try again");
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goto next_try;
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}
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}
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}
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if (rc)
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{
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xfree (pi);
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return rc;
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}
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if (!*pi->pin)
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{
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xfree (pi);
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pi = NULL; /* User does not want a passphrase. */
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}
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}
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rc = gcry_pk_genkey (&s_key, s_keyparam );
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gcry_sexp_release (s_keyparam);
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if (rc)
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{
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log_error ("key generation failed: %s\n", gpg_strerror (rc));
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xfree (pi);
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return rc;
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}
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/* break out the parts */
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s_private = gcry_sexp_find_token (s_key, "private-key", 0);
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if (!s_private)
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{
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log_error ("key generation failed: invalid return value\n");
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gcry_sexp_release (s_key);
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xfree (pi);
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return gpg_error (GPG_ERR_INV_DATA);
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}
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s_public = gcry_sexp_find_token (s_key, "public-key", 0);
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if (!s_public)
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{
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log_error ("key generation failed: invalid return value\n");
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gcry_sexp_release (s_private);
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gcry_sexp_release (s_key);
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xfree (pi);
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return gpg_error (GPG_ERR_INV_DATA);
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}
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gcry_sexp_release (s_key); s_key = NULL;
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/* store the secret key */
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if (DBG_CRYPTO)
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log_debug ("storing private key\n");
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rc = store_key (s_private, pi? pi->pin:NULL, 0);
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xfree (pi); pi = NULL;
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gcry_sexp_release (s_private);
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if (rc)
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{
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gcry_sexp_release (s_public);
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return rc;
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}
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/* return the public key */
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if (DBG_CRYPTO)
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log_debug ("returning public key\n");
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len = gcry_sexp_sprint (s_public, GCRYSEXP_FMT_CANON, NULL, 0);
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assert (len);
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buf = xtrymalloc (len);
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if (!buf)
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{
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gpg_error_t tmperr = out_of_core ();
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gcry_sexp_release (s_private);
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gcry_sexp_release (s_public);
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return tmperr;
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}
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len = gcry_sexp_sprint (s_public, GCRYSEXP_FMT_CANON, buf, len);
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assert (len);
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put_membuf (outbuf, buf, len);
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gcry_sexp_release (s_public);
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xfree (buf);
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return 0;
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}
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/* Apply a new passpahrse to the key S_SKEY and store it. */
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int
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agent_protect_and_store (ctrl_t ctrl, gcry_sexp_t s_skey)
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{
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struct pin_entry_info_s *pi, *pi2;
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int rc;
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{
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const char *text1 = _("Please enter the new passphrase");
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const char *text2 = _("Please re-enter this passphrase");
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const char *initial_errtext = NULL;
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pi = gcry_calloc_secure (2, sizeof (*pi) + 100);
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pi2 = pi + (sizeof *pi + 100);
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pi->max_length = 100;
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pi->max_tries = 3;
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pi2->max_length = 100;
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pi2->max_tries = 3;
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pi2->check_cb = reenter_compare_cb;
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pi2->check_cb_arg = pi->pin;
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next_try:
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rc = agent_askpin (ctrl, text1, NULL, initial_errtext, pi);
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initial_errtext = NULL;
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if (!rc)
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{
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if (check_passphrase_constraints (ctrl, pi->pin))
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{
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pi->failed_tries = 0;
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pi2->failed_tries = 0;
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goto next_try;
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}
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/* Unless the passphrase is empty, ask to confirm it. */
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if (pi->pin && *pi->pin)
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{
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rc = agent_askpin (ctrl, text2, NULL, NULL, pi2);
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if (rc == -1)
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{ /* The re-entered one did not match and the user did not
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hit cancel. */
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initial_errtext = _("does not match - try again");
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goto next_try;
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}
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}
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}
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if (rc)
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{
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xfree (pi);
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return rc;
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}
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if (!*pi->pin)
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{
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xfree (pi);
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pi = NULL; /* User does not want a passphrase. */
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}
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}
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rc = store_key (s_skey, pi? pi->pin:NULL, 1);
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xfree (pi);
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return 0;
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}
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