mirror of
git://git.gnupg.org/gnupg.git
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c9aadcb3a2
* agent/agent.h (struct pin_entry_info_s): Add fields repeat_okay and with_repeat. * agent/call-pinentry.c (close_button_status_cb): Rewrite and check for PIN_REPEAT. Change users to check only the relevant bit. (agent_askpin): Support repeat logic of new Pinentries. * agent/command-ssh.c (ssh_identity_register): Use the new repeat feature. * agent/genkey.c (agent_ask_new_passphrase): Ditto. -- If we need to confirm a passphrase entry (e.g. for new passphrase) we set a flag into the pinentry info block. The we try to use the new pinentry command SETREPEATERROR; if that fails, we continue as usual. If that succeeds we ask the pinentry to show the repeat (confirmation) prompt and on successful return we set another flag in the pinentry info block so that the caller can skip its own confirmation check. A new status line from the pinentry indicates that the feature is actually supported (it may not be supported on certain systems for example when using the ncurses backend). Signed-off-by: Werner Koch <wk@gnupg.org>
577 lines
15 KiB
C
577 lines
15 KiB
C
/* genkey.c - Generate a keypair
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* Copyright (C) 2002, 2003, 2004, 2007, 2010 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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#include "exechelp.h"
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#include "sysutils.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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unsigned long s2k_count)
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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, s2k_count);
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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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/* Count the number of non-alpha characters in S. Control characters
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and non-ascii characters are not considered. */
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static size_t
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nonalpha_count (const char *s)
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{
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size_t n;
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for (n=0; *s; s++)
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if (isascii (*s) && ( isdigit (*s) || ispunct (*s) ))
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n++;
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return n;
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}
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/* Check PW against a list of pattern. Return 0 if PW does not match
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these pattern. */
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static int
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check_passphrase_pattern (ctrl_t ctrl, const char *pw)
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{
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gpg_error_t err = 0;
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const char *pgmname = gnupg_module_name (GNUPG_MODULE_NAME_CHECK_PATTERN);
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FILE *infp;
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const char *argv[10];
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pid_t pid;
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int result, i;
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(void)ctrl;
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infp = gnupg_tmpfile ();
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if (!infp)
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{
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err = gpg_error_from_syserror ();
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log_error (_("error creating temporary file: %s\n"), gpg_strerror (err));
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return 1; /* Error - assume password should not be used. */
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}
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if (fwrite (pw, strlen (pw), 1, infp) != 1)
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{
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err = gpg_error_from_syserror ();
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log_error (_("error writing to temporary file: %s\n"),
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gpg_strerror (err));
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fclose (infp);
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return 1; /* Error - assume password should not be used. */
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}
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fseek (infp, 0, SEEK_SET);
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clearerr (infp);
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i = 0;
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argv[i++] = "--null";
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argv[i++] = "--",
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argv[i++] = opt.check_passphrase_pattern,
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argv[i] = NULL;
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assert (i < sizeof argv);
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if (gnupg_spawn_process_fd (pgmname, argv, fileno (infp), -1, -1, &pid))
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result = 1; /* Execute error - assume password should no be used. */
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else if (gnupg_wait_process (pgmname, pid, 1, NULL))
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result = 1; /* Helper returned an error - probably a match. */
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else
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result = 0; /* Success; i.e. no match. */
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gnupg_release_process (pid);
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/* Overwrite our temporary file. */
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fseek (infp, 0, SEEK_SET);
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clearerr (infp);
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for (i=((strlen (pw)+99)/100)*100; i > 0; i--)
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putc ('\xff', infp);
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fflush (infp);
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fclose (infp);
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return result;
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}
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static int
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take_this_one_anyway2 (ctrl_t ctrl, const char *desc, const char *anyway_btn)
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{
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gpg_error_t err;
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if (opt.enforce_passphrase_constraints)
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{
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err = agent_show_message (ctrl, desc, _("Enter new passphrase"));
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if (!err)
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err = gpg_error (GPG_ERR_CANCELED);
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}
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else
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err = agent_get_confirmation (ctrl, desc,
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anyway_btn, _("Enter new passphrase"), 0);
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return err;
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}
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static int
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take_this_one_anyway (ctrl_t ctrl, const char *desc)
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{
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return take_this_one_anyway2 (ctrl, desc, _("Take this one anyway"));
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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. If SILENT is set, no message are
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displayed. */
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int
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check_passphrase_constraints (ctrl_t ctrl, const char *pw, int silent)
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{
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gpg_error_t err = 0;
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unsigned int minlen = opt.min_passphrase_len;
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unsigned int minnonalpha = opt.min_passphrase_nonalpha;
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char *msg1 = NULL;
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char *msg2 = NULL;
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char *msg3 = NULL;
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if (!pw)
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pw = "";
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/* The first check is to warn about an empty passphrase. */
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if (!*pw)
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{
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const char *desc = (opt.enforce_passphrase_constraints?
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_("You have not entered a passphrase!%0A"
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"An empty passphrase is not allowed.") :
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_("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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if (silent)
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return gpg_error (GPG_ERR_INV_PASSPHRASE);
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err = take_this_one_anyway2 (ctrl, desc,
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_("Yes, protection is not needed"));
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goto leave;
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}
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/* Now check the constraints and collect the error messages unless
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in in silent mode which returns immediately. */
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if (utf8_charcount (pw) < minlen )
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{
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if (silent)
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{
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err = gpg_error (GPG_ERR_INV_PASSPHRASE);
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goto leave;
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}
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msg1 = xtryasprintf
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( ngettext ("A passphrase should be at least %u character long.",
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"A passphrase should be at least %u characters long.",
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minlen), minlen );
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if (!msg1)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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}
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if (nonalpha_count (pw) < minnonalpha )
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{
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if (silent)
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{
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err = gpg_error (GPG_ERR_INV_PASSPHRASE);
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goto leave;
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}
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msg2 = xtryasprintf
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( ngettext ("A passphrase should contain at least %u digit or%%0A"
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"special character.",
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"A passphrase should contain at least %u digits or%%0A"
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"special characters.",
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minnonalpha), minnonalpha );
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if (!msg2)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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}
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/* If configured check the passphrase against a list of known words
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and pattern. The actual test is done by an external program.
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The warning message is generic to give the user no hint on how to
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circumvent this list. */
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if (*pw && opt.check_passphrase_pattern &&
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check_passphrase_pattern (ctrl, pw))
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{
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if (silent)
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{
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err = gpg_error (GPG_ERR_INV_PASSPHRASE);
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goto leave;
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}
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msg3 = xtryasprintf
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(_("A passphrase may not be a known term or match%%0A"
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"certain pattern."));
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if (!msg3)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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}
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if (msg1 || msg2 || msg3)
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{
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char *msg;
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size_t n;
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msg = strconcat
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(_("Warning: You have entered an insecure passphrase."),
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"%0A%0A",
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msg1? msg1 : "", msg1? "%0A" : "",
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msg2? msg2 : "", msg2? "%0A" : "",
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msg3? msg3 : "", msg3? "%0A" : "",
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NULL);
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if (!msg)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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/* Strip a trailing "%0A". */
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n = strlen (msg);
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if (n > 3 && !strcmp (msg + n - 3, "%0A"))
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msg[n-3] = 0;
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/* Show error messages. */
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err = take_this_one_anyway (ctrl, msg);
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xfree (msg);
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}
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leave:
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xfree (msg1);
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xfree (msg2);
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xfree (msg3);
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return err;
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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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/* Ask the user for a new passphrase using PROMPT. On success the
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function returns 0 and store the passphrase at R_PASSPHRASE; if the
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user opted not to use a passphrase NULL will be stored there. The
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user needs to free the returned string. In case of an error and
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error code is returned and NULL stored at R_PASSPHRASE. */
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gpg_error_t
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agent_ask_new_passphrase (ctrl_t ctrl, const char *prompt,
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char **r_passphrase)
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{
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gpg_error_t err;
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const char *text1 = prompt;
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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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struct pin_entry_info_s *pi, *pi2;
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*r_passphrase = NULL;
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if (ctrl->pinentry_mode == PINENTRY_MODE_LOOPBACK)
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{
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size_t size;
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size_t len = 100;
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unsigned char *buffer;
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err = pinentry_loopback(ctrl, "NEW_PASSPHRASE", &buffer, &size, len);
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if (!err)
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{
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if (size)
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{
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buffer[size] = 0;
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*r_passphrase = buffer;
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}
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else
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*r_passphrase = NULL;
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}
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return err;
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}
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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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pi->with_qualitybar = 1;
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pi->with_repeat = 1;
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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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err = agent_askpin (ctrl, text1, NULL, initial_errtext, pi);
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initial_errtext = NULL;
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if (!err)
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{
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if (check_passphrase_constraints (ctrl, pi->pin, 0))
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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 or the pinentry told us that
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it already did the repetition check, ask to confirm it. */
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if (pi->pin && *pi->pin && !pi->repeat_okay)
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{
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err = agent_askpin (ctrl, text2, NULL, NULL, pi2);
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if (err == -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 (!err && *pi->pin)
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{
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/* User wants a passphrase. */
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*r_passphrase = xtrystrdup (pi->pin);
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if (!*r_passphrase)
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err = gpg_error_from_syserror ();
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}
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xfree (pi);
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return err;
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}
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/* Generate a new keypair according to the parameters given in
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KEYPARAM. If CACHE_NONCE is given first try to lookup a passphrase
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using the cache nonce. If NO_PROTECTION is true the key will not
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be protected by a passphrase. */
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int
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agent_genkey (ctrl_t ctrl, const char *cache_nonce,
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const char *keyparam, size_t keyparamlen, int no_protection,
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int preset, 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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char *passphrase;
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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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if (no_protection || !cache_nonce)
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passphrase = NULL;
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else
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passphrase = agent_get_cache (cache_nonce, CACHE_MODE_NONCE);
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if (passphrase || no_protection)
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rc = 0;
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else
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rc = agent_ask_new_passphrase (ctrl,
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_("Please enter the passphrase to%0A"
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"protect your new key"),
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&passphrase);
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if (rc)
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return rc;
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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 (passphrase);
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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 (passphrase);
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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 (passphrase);
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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, passphrase, 0, ctrl->s2k_count);
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if (!rc)
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{
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if (!cache_nonce)
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{
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char tmpbuf[12];
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gcry_create_nonce (tmpbuf, 12);
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cache_nonce = bin2hex (tmpbuf, 12, NULL);
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}
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if (cache_nonce
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&& !no_protection
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&& !agent_put_cache (cache_nonce, CACHE_MODE_NONCE,
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passphrase, ctrl->cache_ttl_opt_preset))
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agent_write_status (ctrl, "CACHE_NONCE", cache_nonce, NULL);
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if (preset && !no_protection)
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{
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unsigned char grip[20];
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char hexgrip[40+1];
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if (gcry_pk_get_keygrip (s_private, grip))
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{
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bin2hex(grip, 20, hexgrip);
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rc = agent_put_cache (hexgrip, CACHE_MODE_ANY, passphrase,
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ctrl->cache_ttl_opt_preset);
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}
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}
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}
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xfree (passphrase);
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passphrase = 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 */
|
||
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 passphrase to the key S_SKEY and store it. If
|
||
PASSPHRASE_ADDR and *PASSPHRASE_ADDR are not NULL, use that
|
||
passphrase. If PASSPHRASE_ADDR is not NULL store a newly entered
|
||
passphrase at that address. */
|
||
gpg_error_t
|
||
agent_protect_and_store (ctrl_t ctrl, gcry_sexp_t s_skey,
|
||
char **passphrase_addr)
|
||
{
|
||
gpg_error_t err;
|
||
|
||
if (passphrase_addr && *passphrase_addr)
|
||
{
|
||
/* Take an empty string as request not to protect the key. */
|
||
err = store_key (s_skey, **passphrase_addr? *passphrase_addr:NULL, 1,
|
||
ctrl->s2k_count);
|
||
}
|
||
else
|
||
{
|
||
char *pass = NULL;
|
||
|
||
if (passphrase_addr)
|
||
{
|
||
xfree (*passphrase_addr);
|
||
*passphrase_addr = NULL;
|
||
}
|
||
err = agent_ask_new_passphrase (ctrl,
|
||
_("Please enter the new passphrase"),
|
||
&pass);
|
||
if (!err)
|
||
err = store_key (s_skey, pass, 1, ctrl->s2k_count);
|
||
if (!err && passphrase_addr)
|
||
*passphrase_addr = pass;
|
||
else
|
||
xfree (pass);
|
||
}
|
||
|
||
return err;
|
||
}
|