LCOV - code coverage report
Current view: top level - agent - genkey.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 53 280 18.9 %
Date: 2016-09-12 12:29:17 Functions: 2 10 20.0 %

          Line data    Source code
       1             : /* genkey.c - Generate a keypair
       2             :  * Copyright (C) 2002, 2003, 2004, 2007, 2010 Free Software Foundation, Inc.
       3             :  * Copyright (C) 2015 g10 Code GmbH.
       4             :  *
       5             :  * This file is part of GnuPG.
       6             :  *
       7             :  * GnuPG is free software; you can redistribute it and/or modify
       8             :  * it under the terms of the GNU General Public License as published by
       9             :  * the Free Software Foundation; either version 3 of the License, or
      10             :  * (at your option) any later version.
      11             :  *
      12             :  * GnuPG is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      15             :  * GNU General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU General Public License
      18             :  * along with this program; if not, see <http://www.gnu.org/licenses/>.
      19             :  */
      20             : 
      21             : #include <config.h>
      22             : #include <errno.h>
      23             : #include <stdio.h>
      24             : #include <stdlib.h>
      25             : #include <string.h>
      26             : #include <ctype.h>
      27             : #include <assert.h>
      28             : 
      29             : #include "agent.h"
      30             : #include "i18n.h"
      31             : #include "exechelp.h"
      32             : #include "sysutils.h"
      33             : 
      34             : static int
      35           3 : store_key (gcry_sexp_t private, const char *passphrase, int force,
      36             :         unsigned long s2k_count)
      37             : {
      38             :   int rc;
      39             :   unsigned char *buf;
      40             :   size_t len;
      41             :   unsigned char grip[20];
      42             : 
      43           3 :   if ( !gcry_pk_get_keygrip (private, grip) )
      44             :     {
      45           0 :       log_error ("can't calculate keygrip\n");
      46           0 :       return gpg_error (GPG_ERR_GENERAL);
      47             :     }
      48             : 
      49           3 :   len = gcry_sexp_sprint (private, GCRYSEXP_FMT_CANON, NULL, 0);
      50           3 :   assert (len);
      51           3 :   buf = gcry_malloc_secure (len);
      52           3 :   if (!buf)
      53           0 :       return out_of_core ();
      54           3 :   len = gcry_sexp_sprint (private, GCRYSEXP_FMT_CANON, buf, len);
      55           3 :   assert (len);
      56             : 
      57           3 :   if (passphrase)
      58             :     {
      59             :       unsigned char *p;
      60             : 
      61           0 :       rc = agent_protect (buf, passphrase, &p, &len, s2k_count, -1);
      62           0 :       if (rc)
      63             :         {
      64           0 :           xfree (buf);
      65           0 :           return rc;
      66             :         }
      67           0 :       xfree (buf);
      68           0 :       buf = p;
      69             :     }
      70             : 
      71           3 :   rc = agent_write_private_key (grip, buf, len, force);
      72           3 :   xfree (buf);
      73           3 :   return rc;
      74             : }
      75             : 
      76             : 
      77             : /* Count the number of non-alpha characters in S.  Control characters
      78             :    and non-ascii characters are not considered.  */
      79             : static size_t
      80           0 : nonalpha_count (const char *s)
      81             : {
      82             :   size_t n;
      83             : 
      84           0 :   for (n=0; *s; s++)
      85           0 :     if (isascii (*s) && ( isdigit (*s) || ispunct (*s) ))
      86           0 :       n++;
      87             : 
      88           0 :   return n;
      89             : }
      90             : 
      91             : 
      92             : /* Check PW against a list of pattern.  Return 0 if PW does not match
      93             :    these pattern.  */
      94             : static int
      95           0 : check_passphrase_pattern (ctrl_t ctrl, const char *pw)
      96             : {
      97           0 :   gpg_error_t err = 0;
      98           0 :   const char *pgmname = gnupg_module_name (GNUPG_MODULE_NAME_CHECK_PATTERN);
      99             :   FILE *infp;
     100             :   const char *argv[10];
     101             :   pid_t pid;
     102             :   int result, i;
     103             : 
     104             :   (void)ctrl;
     105             : 
     106           0 :   infp = gnupg_tmpfile ();
     107           0 :   if (!infp)
     108             :     {
     109           0 :       err = gpg_error_from_syserror ();
     110           0 :       log_error (_("error creating temporary file: %s\n"), gpg_strerror (err));
     111           0 :       return 1; /* Error - assume password should not be used.  */
     112             :     }
     113             : 
     114           0 :   if (fwrite (pw, strlen (pw), 1, infp) != 1)
     115             :     {
     116           0 :       err = gpg_error_from_syserror ();
     117           0 :       log_error (_("error writing to temporary file: %s\n"),
     118             :                  gpg_strerror (err));
     119           0 :       fclose (infp);
     120           0 :       return 1; /* Error - assume password should not be used.  */
     121             :     }
     122           0 :   fseek (infp, 0, SEEK_SET);
     123           0 :   clearerr (infp);
     124             : 
     125           0 :   i = 0;
     126           0 :   argv[i++] = "--null";
     127           0 :   argv[i++] = "--",
     128           0 :   argv[i++] = opt.check_passphrase_pattern,
     129           0 :   argv[i] = NULL;
     130           0 :   assert (i < sizeof argv);
     131             : 
     132           0 :   if (gnupg_spawn_process_fd (pgmname, argv, fileno (infp), -1, -1, &pid))
     133           0 :     result = 1; /* Execute error - assume password should no be used.  */
     134           0 :   else if (gnupg_wait_process (pgmname, pid, 1, NULL))
     135           0 :     result = 1; /* Helper returned an error - probably a match.  */
     136             :   else
     137           0 :     result = 0; /* Success; i.e. no match.  */
     138           0 :   gnupg_release_process (pid);
     139             : 
     140             :   /* Overwrite our temporary file. */
     141           0 :   fseek (infp, 0, SEEK_SET);
     142           0 :   clearerr (infp);
     143           0 :   for (i=((strlen (pw)+99)/100)*100; i > 0; i--)
     144           0 :     putc ('\xff', infp);
     145           0 :   fflush (infp);
     146           0 :   fclose (infp);
     147           0 :   return result;
     148             : }
     149             : 
     150             : 
     151             : static int
     152           0 : take_this_one_anyway2 (ctrl_t ctrl, const char *desc, const char *anyway_btn)
     153             : {
     154             :   gpg_error_t err;
     155             : 
     156           0 :   if (opt.enforce_passphrase_constraints)
     157             :     {
     158           0 :       err = agent_show_message (ctrl, desc, L_("Enter new passphrase"));
     159           0 :       if (!err)
     160           0 :         err = gpg_error (GPG_ERR_CANCELED);
     161             :     }
     162             :   else
     163           0 :     err = agent_get_confirmation (ctrl, desc,
     164             :                                   anyway_btn, L_("Enter new passphrase"), 0);
     165           0 :   return err;
     166             : }
     167             : 
     168             : 
     169             : static int
     170           0 : take_this_one_anyway (ctrl_t ctrl, const char *desc)
     171             : {
     172           0 :   return take_this_one_anyway2 (ctrl, desc, L_("Take this one anyway"));
     173             : }
     174             : 
     175             : 
     176             : /* Check whether the passphrase PW is suitable. Returns 0 if the
     177             :    passphrase is suitable and true if it is not and the user should be
     178             :    asked to provide a different one.  If FAILED_CONSTRAINT is set, a
     179             :    message describing the problem is returned in
     180             :    *FAILED_CONSTRAINT.  */
     181             : int
     182           0 : check_passphrase_constraints (ctrl_t ctrl, const char *pw,
     183             :                               char **failed_constraint)
     184             : {
     185           0 :   gpg_error_t err = 0;
     186           0 :   unsigned int minlen = opt.min_passphrase_len;
     187           0 :   unsigned int minnonalpha = opt.min_passphrase_nonalpha;
     188           0 :   char *msg1 = NULL;
     189           0 :   char *msg2 = NULL;
     190           0 :   char *msg3 = NULL;
     191             : 
     192           0 :   if (ctrl && ctrl->pinentry_mode == PINENTRY_MODE_LOOPBACK)
     193           0 :     return 0;
     194             : 
     195           0 :   if (!pw)
     196           0 :     pw = "";
     197             : 
     198             :   /* The first check is to warn about an empty passphrase. */
     199           0 :   if (!*pw)
     200             :     {
     201           0 :       const char *desc = (opt.enforce_passphrase_constraints?
     202             :                           L_("You have not entered a passphrase!%0A"
     203           0 :                              "An empty passphrase is not allowed.") :
     204             :                           L_("You have not entered a passphrase - "
     205             :                              "this is in general a bad idea!%0A"
     206             :                              "Please confirm that you do not want to "
     207             :                              "have any protection on your key."));
     208             : 
     209           0 :       err = 1;
     210           0 :       if (failed_constraint)
     211             :         {
     212           0 :           if (opt.enforce_passphrase_constraints)
     213           0 :             *failed_constraint = xstrdup (desc);
     214             :           else
     215           0 :             err = take_this_one_anyway2 (ctrl, desc,
     216             :                                          L_("Yes, protection is not needed"));
     217             :         }
     218             : 
     219           0 :       goto leave;
     220             :     }
     221             : 
     222             :   /* Now check the constraints and collect the error messages unless
     223             :      in in silent mode which returns immediately.  */
     224           0 :   if (utf8_charcount (pw, -1) < minlen )
     225             :     {
     226           0 :       if (!failed_constraint)
     227             :         {
     228           0 :           err = gpg_error (GPG_ERR_INV_PASSPHRASE);
     229           0 :           goto leave;
     230             :         }
     231             : 
     232           0 :       msg1 = xtryasprintf
     233           0 :         ( ngettext ("A passphrase should be at least %u character long.",
     234             :                     "A passphrase should be at least %u characters long.",
     235             :                     minlen), minlen );
     236           0 :       if (!msg1)
     237             :         {
     238           0 :           err = gpg_error_from_syserror ();
     239           0 :           goto leave;
     240             :         }
     241             :     }
     242             : 
     243           0 :   if (nonalpha_count (pw) < minnonalpha )
     244             :     {
     245           0 :       if (!failed_constraint)
     246             :         {
     247           0 :           err = gpg_error (GPG_ERR_INV_PASSPHRASE);
     248           0 :           goto leave;
     249             :         }
     250             : 
     251           0 :       msg2 = xtryasprintf
     252           0 :         ( ngettext ("A passphrase should contain at least %u digit or%%0A"
     253             :                     "special character.",
     254             :                     "A passphrase should contain at least %u digits or%%0A"
     255             :                     "special characters.",
     256             :                     minnonalpha), minnonalpha );
     257           0 :       if (!msg2)
     258             :         {
     259           0 :           err = gpg_error_from_syserror ();
     260           0 :           goto leave;
     261             :         }
     262             :     }
     263             : 
     264             :   /* If configured check the passphrase against a list of known words
     265             :      and pattern.  The actual test is done by an external program.
     266             :      The warning message is generic to give the user no hint on how to
     267             :      circumvent this list.  */
     268           0 :   if (*pw && opt.check_passphrase_pattern &&
     269           0 :       check_passphrase_pattern (ctrl, pw))
     270             :     {
     271           0 :       if (!failed_constraint)
     272             :         {
     273           0 :           err = gpg_error (GPG_ERR_INV_PASSPHRASE);
     274           0 :           goto leave;
     275             :         }
     276             : 
     277           0 :       msg3 = xtryasprintf
     278             :         (L_("A passphrase may not be a known term or match%%0A"
     279             :             "certain pattern."));
     280           0 :       if (!msg3)
     281             :         {
     282           0 :           err = gpg_error_from_syserror ();
     283           0 :           goto leave;
     284             :         }
     285             :     }
     286             : 
     287           0 :   if (failed_constraint && (msg1 || msg2 || msg3))
     288             :     {
     289             :       char *msg;
     290             :       size_t n;
     291             : 
     292           0 :       msg = strconcat
     293             :         (L_("Warning: You have entered an insecure passphrase."),
     294             :          "%0A%0A",
     295             :          msg1? msg1 : "", msg1? "%0A" : "",
     296             :          msg2? msg2 : "", msg2? "%0A" : "",
     297             :          msg3? msg3 : "", msg3? "%0A" : "",
     298             :          NULL);
     299           0 :       if (!msg)
     300             :         {
     301           0 :           err = gpg_error_from_syserror ();
     302           0 :           goto leave;
     303             :         }
     304             :       /* Strip a trailing "%0A".  */
     305           0 :       n = strlen (msg);
     306           0 :       if (n > 3 && !strcmp (msg + n - 3, "%0A"))
     307           0 :         msg[n-3] = 0;
     308             : 
     309           0 :       err = 1;
     310           0 :       if (opt.enforce_passphrase_constraints)
     311           0 :         *failed_constraint = msg;
     312             :       else
     313             :         {
     314           0 :           err = take_this_one_anyway (ctrl, msg);
     315           0 :           xfree (msg);
     316             :         }
     317             :     }
     318             : 
     319             :  leave:
     320           0 :   xfree (msg1);
     321           0 :   xfree (msg2);
     322           0 :   xfree (msg3);
     323           0 :   return err;
     324             : }
     325             : 
     326             : 
     327             : /* Callback function to compare the first entered PIN with the one
     328             :    currently being entered. */
     329             : static gpg_error_t
     330           0 : reenter_compare_cb (struct pin_entry_info_s *pi)
     331             : {
     332           0 :   const char *pin1 = pi->check_cb_arg;
     333             : 
     334           0 :   if (!strcmp (pin1, pi->pin))
     335           0 :     return 0; /* okay */
     336           0 :   return gpg_error (GPG_ERR_BAD_PASSPHRASE);
     337             : }
     338             : 
     339             : 
     340             : /* Ask the user for a new passphrase using PROMPT.  On success the
     341             :    function returns 0 and store the passphrase at R_PASSPHRASE; if the
     342             :    user opted not to use a passphrase NULL will be stored there.  The
     343             :    user needs to free the returned string.  In case of an error and
     344             :    error code is returned and NULL stored at R_PASSPHRASE.  */
     345             : gpg_error_t
     346           0 : agent_ask_new_passphrase (ctrl_t ctrl, const char *prompt,
     347             :                           char **r_passphrase)
     348             : {
     349             :   gpg_error_t err;
     350           0 :   const char *text1 = prompt;
     351           0 :   const char *text2 = L_("Please re-enter this passphrase");
     352           0 :   char *initial_errtext = NULL;
     353             :   struct pin_entry_info_s *pi, *pi2;
     354             : 
     355           0 :   *r_passphrase = NULL;
     356             : 
     357           0 :   if (ctrl->pinentry_mode == PINENTRY_MODE_LOOPBACK)
     358             :     {
     359             :         size_t size;
     360           0 :         size_t len = 100;
     361             :         unsigned char *buffer;
     362             : 
     363           0 :         err = pinentry_loopback(ctrl, "NEW_PASSPHRASE", &buffer, &size, len);
     364           0 :         if (!err)
     365             :           {
     366           0 :             if (size)
     367             :               {
     368           0 :                 buffer[size] = 0;
     369           0 :                 *r_passphrase = buffer;
     370             :               }
     371             :             else
     372           0 :                 *r_passphrase = NULL;
     373             :           }
     374           0 :         return err;
     375             :     }
     376             : 
     377           0 :   pi = gcry_calloc_secure (1, sizeof (*pi) + MAX_PASSPHRASE_LEN + 1);
     378           0 :   if (!pi)
     379           0 :     return gpg_error_from_syserror ();
     380           0 :   pi2 = gcry_calloc_secure (1, sizeof (*pi2) + MAX_PASSPHRASE_LEN + 1);
     381           0 :   if (!pi2)
     382             :     {
     383           0 :       err = gpg_error_from_syserror ();
     384           0 :       xfree (pi2);
     385           0 :       return err;
     386             :     }
     387           0 :   pi->max_length = MAX_PASSPHRASE_LEN + 1;
     388           0 :   pi->max_tries = 3;
     389           0 :   pi->with_qualitybar = 1;
     390           0 :   pi->with_repeat = 1;
     391           0 :   pi2->max_length = MAX_PASSPHRASE_LEN + 1;
     392           0 :   pi2->max_tries = 3;
     393           0 :   pi2->check_cb = reenter_compare_cb;
     394           0 :   pi2->check_cb_arg = pi->pin;
     395             : 
     396             :  next_try:
     397           0 :   err = agent_askpin (ctrl, text1, NULL, initial_errtext, pi, NULL, 0);
     398           0 :   xfree (initial_errtext);
     399           0 :   initial_errtext = NULL;
     400           0 :   if (!err)
     401             :     {
     402           0 :       if (check_passphrase_constraints (ctrl, pi->pin, &initial_errtext))
     403             :         {
     404           0 :           pi->failed_tries = 0;
     405           0 :           pi2->failed_tries = 0;
     406           0 :           goto next_try;
     407             :         }
     408             :       /* Unless the passphrase is empty or the pinentry told us that
     409             :          it already did the repetition check, ask to confirm it.  */
     410           0 :       if (*pi->pin && !pi->repeat_okay)
     411             :         {
     412           0 :           err = agent_askpin (ctrl, text2, NULL, NULL, pi2, NULL, 0);
     413           0 :           if (gpg_err_code (err) == GPG_ERR_BAD_PASSPHRASE)
     414             :             { /* The re-entered one did not match and the user did not
     415             :                  hit cancel. */
     416           0 :               initial_errtext = xtrystrdup (L_("does not match - try again"));
     417           0 :               if (initial_errtext)
     418           0 :                 goto next_try;
     419           0 :               err = gpg_error_from_syserror ();
     420             :             }
     421             :         }
     422             :     }
     423             : 
     424           0 :   if (!err && *pi->pin)
     425             :     {
     426             :       /* User wants a passphrase. */
     427           0 :       *r_passphrase = xtrystrdup (pi->pin);
     428           0 :       if (!*r_passphrase)
     429           0 :         err = gpg_error_from_syserror ();
     430             :     }
     431             : 
     432           0 :   xfree (initial_errtext);
     433           0 :   xfree (pi2);
     434           0 :   xfree (pi);
     435           0 :   return err;
     436             : }
     437             : 
     438             : 
     439             : 
     440             : /* Generate a new keypair according to the parameters given in
     441             :    KEYPARAM.  If CACHE_NONCE is given first try to lookup a passphrase
     442             :    using the cache nonce.  If NO_PROTECTION is true the key will not
     443             :    be protected by a passphrase.  If OVERRIDE_PASSPHRASE is true that
     444             :    passphrase will be used for the new key.  */
     445             : int
     446           3 : agent_genkey (ctrl_t ctrl, const char *cache_nonce,
     447             :               const char *keyparam, size_t keyparamlen, int no_protection,
     448             :               const char *override_passphrase, int preset, membuf_t *outbuf)
     449             : {
     450             :   gcry_sexp_t s_keyparam, s_key, s_private, s_public;
     451           3 :   char *passphrase_buffer = NULL;
     452             :   const char *passphrase;
     453             :   int rc;
     454             :   size_t len;
     455             :   char *buf;
     456             : 
     457           3 :   rc = gcry_sexp_sscan (&s_keyparam, NULL, keyparam, keyparamlen);
     458           3 :   if (rc)
     459             :     {
     460           0 :       log_error ("failed to convert keyparam: %s\n", gpg_strerror (rc));
     461           0 :       return gpg_error (GPG_ERR_INV_DATA);
     462             :     }
     463             : 
     464             :   /* Get the passphrase now, cause key generation may take a while. */
     465           3 :   if (override_passphrase)
     466           0 :     passphrase = override_passphrase;
     467           3 :   else if (no_protection || !cache_nonce)
     468           3 :     passphrase = NULL;
     469             :   else
     470             :     {
     471           0 :       passphrase_buffer = agent_get_cache (cache_nonce, CACHE_MODE_NONCE);
     472           0 :       passphrase = passphrase_buffer;
     473             :     }
     474             : 
     475           3 :   if (passphrase || no_protection)
     476             :     ;
     477             :   else
     478             :     {
     479           0 :       rc = agent_ask_new_passphrase (ctrl,
     480             :                                      L_("Please enter the passphrase to%0A"
     481             :                                         "protect your new key"),
     482             :                                      &passphrase_buffer);
     483           0 :       if (rc)
     484           0 :         return rc;
     485           0 :       passphrase = passphrase_buffer;
     486             :     }
     487             : 
     488           3 :   rc = gcry_pk_genkey (&s_key, s_keyparam );
     489           3 :   gcry_sexp_release (s_keyparam);
     490           3 :   if (rc)
     491             :     {
     492           0 :       log_error ("key generation failed: %s\n", gpg_strerror (rc));
     493           0 :       xfree (passphrase_buffer);
     494           0 :       return rc;
     495             :     }
     496             : 
     497             :   /* break out the parts */
     498           3 :   s_private = gcry_sexp_find_token (s_key, "private-key", 0);
     499           3 :   if (!s_private)
     500             :     {
     501           0 :       log_error ("key generation failed: invalid return value\n");
     502           0 :       gcry_sexp_release (s_key);
     503           0 :       xfree (passphrase_buffer);
     504           0 :       return gpg_error (GPG_ERR_INV_DATA);
     505             :     }
     506           3 :   s_public = gcry_sexp_find_token (s_key, "public-key", 0);
     507           3 :   if (!s_public)
     508             :     {
     509           0 :       log_error ("key generation failed: invalid return value\n");
     510           0 :       gcry_sexp_release (s_private);
     511           0 :       gcry_sexp_release (s_key);
     512           0 :       xfree (passphrase_buffer);
     513           0 :       return gpg_error (GPG_ERR_INV_DATA);
     514             :     }
     515           3 :   gcry_sexp_release (s_key); s_key = NULL;
     516             : 
     517             :   /* store the secret key */
     518           3 :   if (DBG_CRYPTO)
     519           0 :     log_debug ("storing private key\n");
     520           3 :   rc = store_key (s_private, passphrase, 0, ctrl->s2k_count);
     521           3 :   if (!rc)
     522             :     {
     523           3 :       if (!cache_nonce)
     524             :         {
     525             :           char tmpbuf[12];
     526           3 :           gcry_create_nonce (tmpbuf, 12);
     527           3 :           cache_nonce = bin2hex (tmpbuf, 12, NULL);
     528             :         }
     529           3 :       if (cache_nonce
     530           3 :           && !no_protection
     531           0 :           && !agent_put_cache (cache_nonce, CACHE_MODE_NONCE,
     532             :                                passphrase, ctrl->cache_ttl_opt_preset))
     533           0 :         agent_write_status (ctrl, "CACHE_NONCE", cache_nonce, NULL);
     534           3 :       if (preset && !no_protection)
     535             :         {
     536             :           unsigned char grip[20];
     537             :           char hexgrip[40+1];
     538           0 :           if (gcry_pk_get_keygrip (s_private, grip))
     539             :             {
     540           0 :               bin2hex(grip, 20, hexgrip);
     541           0 :               rc = agent_put_cache (hexgrip, CACHE_MODE_ANY, passphrase,
     542             :                                     ctrl->cache_ttl_opt_preset);
     543             :             }
     544             :         }
     545             :     }
     546           3 :   xfree (passphrase_buffer);
     547           3 :   passphrase_buffer = NULL;
     548           3 :   passphrase = NULL;
     549           3 :   gcry_sexp_release (s_private);
     550           3 :   if (rc)
     551             :     {
     552           0 :       gcry_sexp_release (s_public);
     553           0 :       return rc;
     554             :     }
     555             : 
     556             :   /* return the public key */
     557           3 :   if (DBG_CRYPTO)
     558           0 :     log_debug ("returning public key\n");
     559           3 :   len = gcry_sexp_sprint (s_public, GCRYSEXP_FMT_CANON, NULL, 0);
     560           3 :   assert (len);
     561           3 :   buf = xtrymalloc (len);
     562           3 :   if (!buf)
     563             :     {
     564           0 :       gpg_error_t tmperr = out_of_core ();
     565           0 :       gcry_sexp_release (s_private);
     566           0 :       gcry_sexp_release (s_public);
     567           0 :       return tmperr;
     568             :     }
     569           3 :   len = gcry_sexp_sprint (s_public, GCRYSEXP_FMT_CANON, buf, len);
     570           3 :   assert (len);
     571           3 :   put_membuf (outbuf, buf, len);
     572           3 :   gcry_sexp_release (s_public);
     573           3 :   xfree (buf);
     574             : 
     575           3 :   return 0;
     576             : }
     577             : 
     578             : 
     579             : 
     580             : /* Apply a new passphrase to the key S_SKEY and store it.  If
     581             :    PASSPHRASE_ADDR and *PASSPHRASE_ADDR are not NULL, use that
     582             :    passphrase.  If PASSPHRASE_ADDR is not NULL store a newly entered
     583             :    passphrase at that address. */
     584             : gpg_error_t
     585           0 : agent_protect_and_store (ctrl_t ctrl, gcry_sexp_t s_skey,
     586             :                          char **passphrase_addr)
     587             : {
     588             :   gpg_error_t err;
     589             : 
     590           0 :   if (passphrase_addr && *passphrase_addr)
     591             :     {
     592             :       /* Take an empty string as request not to protect the key.  */
     593           0 :       err = store_key (s_skey, **passphrase_addr? *passphrase_addr:NULL, 1,
     594             :               ctrl->s2k_count);
     595             :     }
     596             :   else
     597             :     {
     598           0 :       char *pass = NULL;
     599             : 
     600           0 :       if (passphrase_addr)
     601             :         {
     602           0 :           xfree (*passphrase_addr);
     603           0 :           *passphrase_addr = NULL;
     604             :         }
     605           0 :       err = agent_ask_new_passphrase (ctrl,
     606             :                                       L_("Please enter the new passphrase"),
     607             :                                       &pass);
     608           0 :       if (!err)
     609           0 :         err = store_key (s_skey, pass, 1, ctrl->s2k_count);
     610           0 :       if (!err && passphrase_addr)
     611           0 :         *passphrase_addr = pass;
     612             :       else
     613           0 :         xfree (pass);
     614             :     }
     615             : 
     616           0 :   return err;
     617             : }

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