sm/certreqgen-ui.c

   1 /* certreqgen-ui.c - Simple user interface for certreqgen.c
   2  * Copyright (C) 2007 Free Software Foundation, Inc.
   3  *
   4  * This file is part of GnuPG.
   5  *
   6  * GnuPG is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * GnuPG is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <errno.h>
  25 #include <unistd.h>
  26 #include <time.h>
  27 #include <assert.h>
  28
  29 #include "gpgsm.h"
  30 #include <gcrypt.h>
  31
  32 #include "i18n.h"
  33 #include "ttyio.h"
  34 #include "membuf.h"
  35
  36
  37 /* Prompt for lines and append them to MB.  */
  38 static void
  39 ask_mb_lines (membuf_t *mb, const char *prefix)
  40 {
  41   char *answer = NULL;
  42
  43   do
  44     {
  45       xfree (answer);
  46       answer = tty_get ("> ");
  47       tty_kill_prompt ();
  48       trim_spaces (answer);
  49       if (*answer)
  50         {
  51           put_membuf_str (mb, prefix);
  52           put_membuf_str (mb, answer);
  53           put_membuf (mb, "\n", 1);
  54         }
  55     }
  56   while (*answer);
  57   xfree (answer);
  58 }
  59
  60 /* Helper to store stuff in a membuf.  */
  61 void
  62 store_key_value_lf (membuf_t *mb, const char *key, const char *value)
  63 {
  64   put_membuf_str (mb, key);
  65   put_membuf_str (mb, value);
  66   put_membuf (mb, "\n", 1);
  67 }
  68
  69 /* Helper tp store a membuf create by mb_ask_lines into MB.  Returns
  70    -1 on error. */
  71 int
  72 store_mb_lines (membuf_t *mb, membuf_t *lines)
  73 {
  74   char *p;
  75
  76   if (get_membuf_len (lines))
  77     {
  78       put_membuf (lines, "", 1);
  79       p = get_membuf (lines, NULL);
  80       if (!p)
  81         return -1;
  82       put_membuf_str (mb, p);
  83       xfree (p);
  84     }
  85   return 0;
  86 }
  87
  88
  89 /* Chech whether we have a key for the key with HEXGRIP.  Returns NULL
  90    if not or a string describing the type of the key (RSA, ELG, DSA,
  91    etc..).  */
  92 static const char *
  93 check_keygrip (ctrl_t ctrl, const char *hexgrip)
  94 {
  95   gpg_error_t err;
  96   ksba_sexp_t public;
  97   size_t publiclen;
  98   int algo;
  99
 100   if (hexgrip[0] == '&')
 101     hexgrip++;
 102
 103   err = gpgsm_agent_readkey (ctrl, 0, hexgrip, &public);
 104   if (err)
 105     return NULL;
 106   publiclen = gcry_sexp_canon_len (public, 0, NULL, NULL);
 107
 108   get_pk_algo_from_canon_sexp (public, publiclen, &algo);
 109   xfree (public);
 110
 111   switch (algo)
 112     {
 113     case GCRY_PK_RSA: return "RSA";
 114     case GCRY_PK_DSA: return "DSA";
 115     case GCRY_PK_ELG: return "ELG";
 116     case GCRY_PK_ECDSA: return "ECDSA";
 117     default: return NULL;
 118     }
 119 }
 120
 121
 122 /* This function is used to create a certificate request from the
 123    command line.  In the past the similar gpgsm-gencert.sh script has
 124    been used for it; however that scripts requires a full Unix shell
 125    and thus is not suitable for the Windows port.  So here is the
 126    re-implementation.  */
 127 void
 128 gpgsm_gencertreq_tty (ctrl_t ctrl, FILE *output_fp)
 129 {
 130   gpg_error_t err;
 131   char *answer;
 132   int selection;
 133   estream_t fp = NULL;
 134   int method;
 135   char *keytype_buffer = NULL;
 136   const char *keytype;
 137   char *keygrip = NULL;
 138   unsigned int nbits;
 139   int minbits = 1024;
 140   int maxbits = 4096;
 141   int defbits = 2048;
 142   const char *keyusage;
 143   char *subject_name;
 144   membuf_t mb_email, mb_dns, mb_uri, mb_result;
 145   char *result = NULL;
 146   int i;
 147   const char *s, *s2;
 148
 149   answer = NULL;
 150   init_membuf (&mb_email, 100);
 151   init_membuf (&mb_dns, 100);
 152   init_membuf (&mb_uri, 100);
 153   init_membuf (&mb_result, 512);
 154
 155  again:
 156   /* Get the type of the key.  */
 157   tty_printf (_("Please select what kind of key you want:\n"));
 158   tty_printf (_("   (%d) RSA\n"), 1 );
 159   tty_printf (_("   (%d) Existing key\n"), 2 );
 160   tty_printf (_("   (%d) Existing key from card\n"), 3 );
 161
 162   do
 163     {
 164       xfree (answer);
 165       answer = tty_get (_("Your selection? "));
 166       tty_kill_prompt ();
 167       selection = *answer? atoi (answer): 1;
 168     }
 169   while (!(selection >= 1 && selection <= 3));
 170   method = selection;
 171
 172   /* Get  size of the key.  */
 173   if (method == 1)
 174     {
 175       keytype = "RSA";
 176       for (;;)
 177         {
 178           xfree (answer);
 179           answer = tty_getf (_("What keysize do you want? (%u) "), defbits);
 180           tty_kill_prompt ();
 181           trim_spaces (answer);
 182           nbits = *answer? atoi (answer): defbits;
 183           if (nbits < minbits || nbits > maxbits)
 184             tty_printf(_("%s keysizes must be in the range %u-%u\n"),
 185                          "RSA", minbits, maxbits);
 186           else
 187             break; /* Okay.  */
 188         }
 189       tty_printf (_("Requested keysize is %u bits\n"), nbits);
 190       /* We round it up so that it better matches the word size.  */
 191       if (( nbits % 64))
 192         {
 193           nbits = ((nbits + 63) / 64) * 64;
 194           tty_printf (_("rounded up to %u bits\n"), nbits);
 195         }
 196     }
 197   else if (method == 2)
 198     {
 199       for (;;)
 200         {
 201           xfree (answer);
 202           answer = tty_get (_("Enter the keygrip: "));
 203           tty_kill_prompt ();
 204           trim_spaces (answer);
 205
 206           if (!*answer)
 207             goto again;
 208           else if (strlen (answer) != 40 &&
 209                    !(answer[0] == '&' && strlen (answer+1) == 40))
 210             tty_printf (_("Not a valid keygrip (expecting 40 hex digits)\n"));
 211           else if (!(keytype = check_keygrip (ctrl, answer)) )
 212             tty_printf (_("No key with this keygrip\n"));
 213           else
 214             break; /* Okay.  */
 215         }
 216       xfree (keygrip);
 217       keygrip = answer;
 218       answer = NULL;
 219       nbits = 1024; /* A dummy value is sufficient.  */
 220     }
 221   else /* method == 3 */
 222     {
 223       char *serialno;
 224       strlist_t keypairlist, sl;
 225       int count;
 226
 227       err = gpgsm_agent_scd_serialno (ctrl, &serialno);
 228       if (err)
 229         {
 230           tty_printf (_("error reading the card: %s\n"), gpg_strerror (err));
 231           goto again;
 232         }
 233       tty_printf (_("Serial number of the card: %s\n"), serialno);
 234       xfree (serialno);
 235
 236       err = gpgsm_agent_scd_keypairinfo (ctrl, &keypairlist);
 237       if (err)
 238         {
 239           tty_printf (_("error reading the card: %s\n"), gpg_strerror (err));
 240           goto again;
 241         }
 242
 243       do
 244         {
 245           tty_printf (_("Available keys:\n"));
 246           for (count=1,sl=keypairlist; sl; sl = sl->next, count++)
 247             tty_printf ("   (%d) %s\n", count, sl->d);
 248           xfree (answer);
 249           answer = tty_get (_("Your selection? "));
 250           tty_kill_prompt ();
 251           trim_spaces (answer);
 252           selection = atoi (answer);
 253         }
 254       while (!(selection > 0 && selection < count));
 255
 256       for (count=1,sl=keypairlist; sl; sl = sl->next, count++)
 257         if (count == selection)
 258           break;
 259
 260       s = sl->d;
 261       while (*s && !spacep (s))
 262         s++;
 263       while (spacep (s))
 264         s++;
 265
 266       xfree (keygrip);
 267       keygrip = NULL;
 268       xfree (keytype_buffer);
 269       keytype_buffer = xasprintf ("card:%s", s);
 270       free_strlist (keypairlist);
 271       keytype = keytype_buffer;
 272       nbits = 1024; /* A dummy value is sufficient.  */
 273     }
 274
 275   /* Ask for the key usage.  */
 276   tty_printf (_("Possible actions for a %s key:\n"), "RSA");
 277   tty_printf (_("   (%d) sign, encrypt\n"), 1 );
 278   tty_printf (_("   (%d) sign\n"), 2 );
 279   tty_printf (_("   (%d) encrypt\n"), 3 );
 280   do
 281     {
 282       xfree (answer);
 283       answer = tty_get (_("Your selection? "));
 284       tty_kill_prompt ();
 285       trim_spaces (answer);
 286       selection = *answer? atoi (answer): 1;
 287       switch (selection)
 288         {
 289         case 1: keyusage = "sign, encrypt"; break;
 290         case 2: keyusage = "sign"; break;
 291         case 3: keyusage = "encrypt"; break;
 292         default: keyusage = NULL; break;
 293         }
 294     }
 295   while (!keyusage);
 296
 297   /* Get the subject name.  */
 298   do
 299     {
 300       size_t erroff, errlen;
 301
 302       xfree (answer);
 303       answer = tty_get (_("Enter the X.509 subject name: "));
 304       tty_kill_prompt ();
 305       trim_spaces (answer);
 306       if (!*answer)
 307         tty_printf (_("No subject name given\n"));
 308       else if ( (err = ksba_dn_teststr (answer, 0, &erroff, &errlen)) )
 309         {
 310           if (gpg_err_code (err) == GPG_ERR_UNKNOWN_NAME)
 311             tty_printf (_("Invalid subject name label `%.*s'\n"),
 312                         (int)errlen, answer+erroff);
 313           else
 314             {
 315               /* TRANSLATORS: The 22 in the second string is the
 316                  length of the first string up to the "%s".  Please
 317                  adjust it do the length of your translation.  The
 318                  second string is merely passed to atoi so you can
 319                  drop everything after the number.  */
 320               tty_printf (_("Invalid subject name `%s'\n"), answer);
 321               tty_printf ("%*s^\n",
 322                           atoi (_("22 translator: see "
 323                                   "certreg-ui.c:gpgsm_gencertreq_tty"))
 324                           + (int)erroff, "");
 325             }
 326           *answer = 0;
 327         }
 328     }
 329   while (!*answer);
 330   subject_name = answer;
 331   answer = NULL;
 332
 333   /* Get the email addresses. */
 334   tty_printf (_("Enter email addresses"));
 335   tty_printf (_(" (end with an empty line):\n"));
 336   ask_mb_lines (&mb_email, "Name-Email: ");
 337
 338   /* DNS names.  */
 339   tty_printf (_("Enter DNS names"));
 340   tty_printf (_(" (optional; end with an empty line):\n"));
 341   ask_mb_lines (&mb_email, "Name-DNS: ");
 342
 343   /* URIs.  */
 344   tty_printf (_("Enter URIs"));
 345   tty_printf (_(" (optional; end with an empty line):\n"));
 346   ask_mb_lines (&mb_email, "Name-URI: ");
 347
 348
 349   /* Put it all together.  */
 350   store_key_value_lf (&mb_result, "Key-Type: ", keytype);
 351   {
 352     char numbuf[30];
 353     snprintf (numbuf, sizeof numbuf, "%u", nbits);
 354     store_key_value_lf (&mb_result, "Key-Length: ", numbuf);
 355   }
 356   store_key_value_lf (&mb_result, "Key-Usage: ", keyusage);
 357   store_key_value_lf (&mb_result, "Name-DN: ", subject_name);
 358   if (keygrip)
 359     store_key_value_lf (&mb_result, "Key-Grip: ", keygrip);
 360   if (store_mb_lines (&mb_result, &mb_email))
 361     goto mem_error;
 362   if (store_mb_lines (&mb_result, &mb_dns))
 363     goto mem_error;
 364   if (store_mb_lines (&mb_result, &mb_uri))
 365     goto mem_error;
 366   put_membuf (&mb_result, "", 1);
 367   result = get_membuf (&mb_result, NULL);
 368   if (!result)
 369     goto mem_error;
 370
 371   tty_printf (_("Parameters to be used for the certificate request:\n"));
 372   for (s=result; (s2 = strchr (s, '\n')); s = s2+1, i++)
 373     tty_printf ("    %.*s\n", (int)(s2-s), s);
 374   tty_printf ("\n");
 375
 376
 377   if (!tty_get_answer_is_yes ("Really create request? (y/N) "))
 378      goto leave;
 379
 380   /* Now create a parameter file and generate the key.  */
 381   fp = es_fopenmem (0, "w+");
 382   if (!fp)
 383     {
 384       log_error (_("error creating temporary file: %s\n"), strerror (errno));
 385       goto leave;
 386     }
 387   es_fputs (result, fp);
 388   es_rewind (fp);
 389   tty_printf (_("Now creating certificate request.  "
 390                 "This may take a while ...\n"));
 391   {
 392     int save_pem = ctrl->create_pem;
 393     ctrl->create_pem = 1; /* Force creation of PEM. */
 394     err = gpgsm_genkey (ctrl, fp, output_fp);
 395     ctrl->create_pem = save_pem;
 396   }
 397   if (!err)
 398     tty_printf (_("Ready.  You should now send this request to your CA.\n"));
 399
 400
 401   goto leave;
 402  mem_error:
 403   log_error (_("resource problem: out of core\n"));
 404  leave:
 405   es_fclose (fp);
 406   xfree (answer);
 407   xfree (subject_name);
 408   xfree (keytype_buffer);
 409   xfree (keygrip);
 410   xfree (get_membuf (&mb_email, NULL));
 411   xfree (get_membuf (&mb_dns, NULL));
 412   xfree (get_membuf (&mb_uri, NULL));
 413   xfree (get_membuf (&mb_result, NULL));
 414   xfree (result);
 415 }