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certreqgen-ui.c
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/* certreqgen-ui.c - Simple user interface for certreqgen.c
* Copyright (C) 2007, 2010, 2011 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include "gpgsm.h"
#include <gcrypt.h>
#include "../common/i18n.h"
#include "../common/ttyio.h"
#include "../common/membuf.h"
/* Prompt for lines and append them to MB. */
static void
ask_mb_lines (membuf_t *mb, const char *prefix)
{
char *answer = NULL;
do
{
xfree (answer);
answer = tty_get ("> ");
tty_kill_prompt ();
trim_spaces (answer);
if (*answer)
{
put_membuf_str (mb, prefix);
put_membuf_str (mb, answer);
put_membuf (mb, "\n", 1);
}
}
while (*answer);
xfree (answer);
}
/* Helper to store stuff in a membuf. */
void
store_key_value_lf (membuf_t *mb, const char *key, const char *value)
{
put_membuf_str (mb, key);
put_membuf_str (mb, value);
put_membuf (mb, "\n", 1);
}
/* Helper tp store a membuf create by mb_ask_lines into MB. Returns
-1 on error. */
int
store_mb_lines (membuf_t *mb, membuf_t *lines)
{
char *p;
if (get_membuf_len (lines))
{
put_membuf (lines, "", 1);
p = get_membuf (lines, NULL);
if (!p)
return -1;
put_membuf_str (mb, p);
xfree (p);
}
return 0;
}
/* Check whether we have a key for the key with HEXGRIP. Returns NULL
if not or a string describing the type of the key (RSA, ELG, DSA,
etc..). */
static const char *
check_keygrip (ctrl_t ctrl, const char *hexgrip)
{
gpg_error_t err;
ksba_sexp_t public;
size_t publiclen;
int algo;
if (hexgrip[0] == '&')
hexgrip++;
err = gpgsm_agent_readkey (ctrl, 0, hexgrip, &public);
if (err)
return NULL;
publiclen = gcry_sexp_canon_len (public, 0, NULL, NULL);
algo = get_pk_algo_from_canon_sexp (public, publiclen);
xfree (public);
switch (algo)
{
case GCRY_PK_RSA: return "RSA";
case GCRY_PK_DSA: return "DSA";
case GCRY_PK_ELG: return "ELG";
case GCRY_PK_ECC: return "ECC";
case GCRY_PK_ECDSA: return "ECDSA";
case GCRY_PK_EDDSA: return "EdDSA";
default: return NULL;
}
}
/* This function is used to create a certificate request from the
command line. In the past the similar gpgsm-gencert.sh script has
been used for it; however that scripts requires a full Unix shell
and thus is not suitable for the Windows port. So here is the
re-implementation. */
void
gpgsm_gencertreq_tty (ctrl_t ctrl, estream_t output_stream)
{
gpg_error_t err;
char *answer;
int selection;
estream_t fp = NULL;
int method;
char *keytype_buffer = NULL;
const char *keytype;
char *keygrip = NULL;
unsigned int nbits;
int minbits = 1024;
int maxbits = 4096;
int defbits = 3072;
const char *keyusage;
char *subject_name;
membuf_t mb_email, mb_dns, mb_uri, mb_result;
char *result = NULL;
const char *s, *s2;
int selfsigned;
answer = NULL;
init_membuf (&mb_email, 100);
init_membuf (&mb_dns, 100);
init_membuf (&mb_uri, 100);
init_membuf (&mb_result, 512);
again:
/* Get the type of the key. */
tty_printf (_("Please select what kind of key you want:\n"));
tty_printf (_(" (%d) RSA\n"), 1 );
tty_printf (_(" (%d) Existing key\n"), 2 );
tty_printf (_(" (%d) Existing key from card\n"), 3 );
do
{
xfree (answer);
answer = tty_get (_("Your selection? "));
tty_kill_prompt ();
selection = *answer? atoi (answer): 1;
}
while (!(selection >= 1 && selection <= 3));
method = selection;
/* Get size of the key. */
if (method == 1)
{
keytype = "RSA";
for (;;)
{
xfree (answer);
answer = tty_getf (_("What keysize do you want? (%u) "), defbits);
tty_kill_prompt ();
trim_spaces (answer);
nbits = *answer? atoi (answer): defbits;
if (nbits < minbits || nbits > maxbits)
tty_printf(_("%s keysizes must be in the range %u-%u\n"),
"RSA", minbits, maxbits);
else
break; /* Okay. */
}
tty_printf (_("Requested keysize is %u bits\n"), nbits);
/* We round it up so that it better matches the word size. */
if (( nbits % 64))
{
nbits = ((nbits + 63) / 64) * 64;
tty_printf (_("rounded up to %u bits\n"), nbits);
}
}
else if (method == 2)
{
for (;;)
{
xfree (answer);
answer = tty_get (_("Enter the keygrip: "));
tty_kill_prompt ();
trim_spaces (answer);
if (!*answer)
goto again;
else if (strlen (answer) != 40 &&
!(answer[0] == '&' && strlen (answer+1) == 40))
tty_printf (_("Not a valid keygrip (expecting 40 hex digits)\n"));
else if (!(keytype = check_keygrip (ctrl, answer)) )
tty_printf (_("No key with this keygrip\n"));
else
break; /* Okay. */
}
xfree (keygrip);
keygrip = answer;
answer = NULL;
nbits = 1024; /* A dummy value is sufficient. */
}
else /* method == 3 */
{
char *serialno;
strlist_t keypairlist, sl;
int count;
err = gpgsm_agent_scd_serialno (ctrl, &serialno);
if (err)
{
tty_printf (_("error reading the card: %s\n"), gpg_strerror (err));
goto again;
}
tty_printf (_("Serial number of the card: %s\n"), serialno);
xfree (serialno);
err = gpgsm_agent_scd_keypairinfo (ctrl, &keypairlist);
if (err)
{
tty_printf (_("error reading the card: %s\n"), gpg_strerror (err));
goto again;
}
do
{
tty_printf (_("Available keys:\n"));
for (count=1,sl=keypairlist; sl; sl = sl->next, count++)
{
ksba_sexp_t pkey;
gcry_sexp_t s_pkey;
char *algostr = NULL;
const char *keyref;
int any = 0;
keyref = strchr (sl->d, ' ');
if (keyref)
{
keyref++;
if (!gpgsm_agent_readkey (ctrl, 1, keyref, &pkey))
{
if (!gcry_sexp_new (&s_pkey, pkey, 0, 0))
algostr = pubkey_algo_string (s_pkey, NULL);
gcry_sexp_release (s_pkey);
}
xfree (pkey);
}
tty_printf (" (%d) %s %s", count, sl->d, algostr);
if ((sl->flags & GCRY_PK_USAGE_CERT))
{
tty_printf ("%scert", any?",":" (");
any = 1;
}
if ((sl->flags & GCRY_PK_USAGE_SIGN))
{
tty_printf ("%ssign", any?",":" (");
any = 1;
}
if ((sl->flags & GCRY_PK_USAGE_AUTH))
{
tty_printf ("%sauth", any?",":" (");
any = 1;
}
if ((sl->flags & GCRY_PK_USAGE_ENCR))
{
tty_printf ("%sencr", any?",":" (");
any = 1;
}
tty_printf ("%s\n", any?")":"");
xfree (algostr);
}
xfree (answer);
answer = tty_get (_("Your selection? "));
tty_kill_prompt ();
trim_spaces (answer);
selection = atoi (answer);
}
while (!(selection > 0 && selection < count));
for (count=1,sl=keypairlist; sl; sl = sl->next, count++)
if (count == selection)
break;
s = sl->d;
while (*s && !spacep (s))
s++;
while (spacep (s))
s++;
xfree (keygrip);
keygrip = NULL;
xfree (keytype_buffer);
keytype_buffer = xasprintf ("card:%s", s);
free_strlist (keypairlist);
keytype = keytype_buffer;
nbits = 1024; /* A dummy value is sufficient. */
}
/* Ask for the key usage. */
tty_printf (_("Possible actions for a %s key:\n"), "RSA");
tty_printf (_(" (%d) sign, encrypt\n"), 1 );
tty_printf (_(" (%d) sign\n"), 2 );
tty_printf (_(" (%d) encrypt\n"), 3 );
do
{
xfree (answer);
answer = tty_get (_("Your selection? "));
tty_kill_prompt ();
trim_spaces (answer);
selection = *answer? atoi (answer): 1;
switch (selection)
{
case 1: keyusage = "sign, encrypt"; break;
case 2: keyusage = "sign"; break;
case 3: keyusage = "encrypt"; break;
default: keyusage = NULL; break;
}
}
while (!keyusage);
/* Get the subject name. */
do
{
size_t erroff, errlen;
xfree (answer);
answer = tty_get (_("Enter the X.509 subject name: "));
tty_kill_prompt ();
trim_spaces (answer);
if (!*answer)
tty_printf (_("No subject name given\n"));
else if ( (err = ksba_dn_teststr (answer, 0, &erroff, &errlen)) )
{
if (gpg_err_code (err) == GPG_ERR_UNKNOWN_NAME)
tty_printf (_("Invalid subject name label '%.*s'\n"),
(int)errlen, answer+erroff);
else
{
/* TRANSLATORS: The 22 in the second string is the
length of the first string up to the "%s". Please
adjust it do the length of your translation. The
second string is merely passed to atoi so you can
drop everything after the number. */
tty_printf (_("Invalid subject name '%s'\n"), answer);
tty_printf ("%*s^\n",
atoi (_("22 translator: see "
"certreg-ui.c:gpgsm_gencertreq_tty"))
+ (int)erroff, "");
}
*answer = 0;
}
}
while (!*answer);
subject_name = answer;
answer = NULL;
/* Get the email addresses. */
tty_printf (_("Enter email addresses"));
tty_printf (_(" (end with an empty line):\n"));
ask_mb_lines (&mb_email, "Name-Email: ");
/* DNS names. */
tty_printf (_("Enter DNS names"));
tty_printf (_(" (optional; end with an empty line):\n"));
ask_mb_lines (&mb_dns, "Name-DNS: ");
/* URIs. */
tty_printf (_("Enter URIs"));
tty_printf (_(" (optional; end with an empty line):\n"));
ask_mb_lines (&mb_uri, "Name-URI: ");
/* Want a self-signed certificate? */
selfsigned = tty_get_answer_is_yes
(_("Create self-signed certificate? (y/N) "));
/* Put it all together. */
store_key_value_lf (&mb_result, "Key-Type: ", keytype);
{
char numbuf[30];
snprintf (numbuf, sizeof numbuf, "%u", nbits);
store_key_value_lf (&mb_result, "Key-Length: ", numbuf);
}
if (keygrip)
store_key_value_lf (&mb_result, "Key-Grip: ", keygrip);
store_key_value_lf (&mb_result, "Key-Usage: ", keyusage);
if (selfsigned)
store_key_value_lf (&mb_result, "Serial: ", "random");
store_key_value_lf (&mb_result, "Name-DN: ", subject_name);
if (store_mb_lines (&mb_result, &mb_email))
goto mem_error;
if (store_mb_lines (&mb_result, &mb_dns))
goto mem_error;
if (store_mb_lines (&mb_result, &mb_uri))
goto mem_error;
put_membuf (&mb_result, "", 1);
result = get_membuf (&mb_result, NULL);
if (!result)
goto mem_error;
tty_printf (_("These parameters are used:\n"));
for (s=result; (s2 = strchr (s, '\n')); s = s2+1)
tty_printf (" %.*s\n", (int)(s2-s), s);
tty_printf ("\n");
if (!tty_get_answer_is_yes ("Proceed with creation? (y/N) "))
goto leave;
/* Now create a parameter file and generate the key. */
fp = es_fopenmem (0, "w+");
if (!fp)
{
log_error (_("error creating temporary file: %s\n"), strerror (errno));
goto leave;
}
es_fputs (result, fp);
es_rewind (fp);
if (selfsigned)
tty_printf ("%s", _("Now creating self-signed certificate. "));
else
tty_printf ("%s", _("Now creating certificate request. "));
tty_printf ("%s", _("This may take a while ...\n"));
{
int save_pem = ctrl->create_pem;
ctrl->create_pem = 1; /* Force creation of PEM. */
err = gpgsm_genkey (ctrl, fp, output_stream);
ctrl->create_pem = save_pem;
}
if (!err)
{
if (selfsigned)
tty_printf (_("Ready.\n"));
else
tty_printf
(_("Ready. You should now send this request to your CA.\n"));
}
goto leave;
mem_error:
log_error (_("resource problem: out of core\n"));
leave:
es_fclose (fp);
xfree (answer);
xfree (subject_name);
xfree (keytype_buffer);
xfree (keygrip);
xfree (get_membuf (&mb_email, NULL));
xfree (get_membuf (&mb_dns, NULL));
xfree (get_membuf (&mb_uri, NULL));
xfree (get_membuf (&mb_result, NULL));
xfree (result);
}

File Metadata

Mime Type
text/x-c
Expires
Tue, Apr 22, 3:53 AM (23 h, 2 m)
Storage Engine
local-disk
Storage Format
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Storage Handle
69/a6/6fdb18d010ced54f8bed68bbadfd

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