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gnupg/sm/export.c

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/* export.c - Export certificates and private keys.
* Copyright (C) 2002, 2003, 2004, 2007 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 <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <assert.h>
#include "gpgsm.h"
#include <gcrypt.h>
#include <ksba.h>
#include "keydb.h"
#include "exechelp.h"
#include "i18n.h"
#include "sysutils.h"
/* A table to store a fingerprint as used in a duplicates table. We
don't need to hash here because a fingerprint is alrady a perfect
hash value. This we use the most significant bits to index the
table and then use a linked list for the overflow. Possible
enhancement for very large number of certictates: Add a second
level table and then resort to a linked list. */
struct duptable_s
{
struct duptable_s *next;
/* Note that we only need to store 19 bytes because the first byte
is implictly given by the table index (we require at least 8
bits). */
unsigned char fpr[19];
};
typedef struct duptable_s *duptable_t;
#define DUPTABLE_BITS 12
#define DUPTABLE_SIZE (1 << DUPTABLE_BITS)
static void print_short_info (ksba_cert_t cert, FILE *fp, estream_t stream);
static gpg_error_t export_p12 (ctrl_t ctrl,
const unsigned char *certimg, size_t certimglen,
const char *prompt, const char *keygrip,
FILE **retfp);
/* Create a table used to indetify duplicated certificates. */
static duptable_t *
create_duptable (void)
{
return xtrycalloc (DUPTABLE_SIZE, sizeof (duptable_t));
}
static void
destroy_duptable (duptable_t *table)
{
int idx;
duptable_t t, t2;
if (table)
{
for (idx=0; idx < DUPTABLE_SIZE; idx++)
for (t = table[idx]; t; t = t2)
{
t2 = t->next;
xfree (t);
}
xfree (table);
}
}
/* Insert the 20 byte fingerprint FPR into TABLE. Sets EXITS to true
if the fingerprint already exists in the table. */
static gpg_error_t
insert_duptable (duptable_t *table, unsigned char *fpr, int *exists)
{
size_t idx;
duptable_t t;
*exists = 0;
idx = fpr[0];
#if DUPTABLE_BITS > 16 || DUPTABLE_BITS < 8
#error cannot handle a table larger than 16 bits or smaller than 8 bits
#elif DUPTABLE_BITS > 8
idx <<= (DUPTABLE_BITS - 8);
idx |= (fpr[1] & ~(~0 << 4));
#endif
for (t = table[idx]; t; t = t->next)
if (!memcmp (t->fpr, fpr+1, 19))
break;
if (t)
{
*exists = 1;
return 0;
}
/* Insert that fingerprint. */
t = xtrymalloc (sizeof *t);
if (!t)
return gpg_error_from_syserror ();
memcpy (t->fpr, fpr+1, 19);
t->next = table[idx];
table[idx] = t;
return 0;
}
/* Export all certificates or just those given in NAMES. If STREAM is
not NULL the output is send to this extended stream. */
void
gpgsm_export (ctrl_t ctrl, strlist_t names, FILE *fp, estream_t stream)
{
KEYDB_HANDLE hd = NULL;
KEYDB_SEARCH_DESC *desc = NULL;
int ndesc;
Base64Context b64writer = NULL;
ksba_writer_t writer;
strlist_t sl;
ksba_cert_t cert = NULL;
int rc=0;
int count = 0;
int i;
duptable_t *dtable;
dtable = create_duptable ();
if (!dtable)
{
log_error ("creating duplicates table failed: %s\n", strerror (errno));
goto leave;
}
hd = keydb_new (0);
if (!hd)
{
log_error ("keydb_new failed\n");
goto leave;
}
if (!names)
ndesc = 1;
else
{
for (sl=names, ndesc=0; sl; sl = sl->next, ndesc++)
;
}
desc = xtrycalloc (ndesc, sizeof *desc);
if (!ndesc)
{
log_error ("allocating memory for export failed: %s\n",
gpg_strerror (out_of_core ()));
goto leave;
}
if (!names)
desc[0].mode = KEYDB_SEARCH_MODE_FIRST;
else
{
for (ndesc=0, sl=names; sl; sl = sl->next)
{
rc = keydb_classify_name (sl->d, desc+ndesc);
if (rc)
{
log_error ("key `%s' not found: %s\n",
sl->d, gpg_strerror (rc));
rc = 0;
}
else
ndesc++;
}
}
/* If all specifications are done by fingerprint, we switch to
ephemeral mode so that _all_ currently available and matching
certificates are exported.
fixme: we should in this case keep a list of certificates to
avoid accidential export of duplicate certificates. */
if (names && ndesc)
{
for (i=0; (i < ndesc
&& (desc[i].mode == KEYDB_SEARCH_MODE_FPR
|| desc[i].mode == KEYDB_SEARCH_MODE_FPR20
|| desc[i].mode == KEYDB_SEARCH_MODE_FPR16)); i++)
;
if (i == ndesc)
keydb_set_ephemeral (hd, 1);
}
while (!(rc = keydb_search (hd, desc, ndesc)))
{
unsigned char fpr[20];
int exists;
if (!names)
desc[0].mode = KEYDB_SEARCH_MODE_NEXT;
rc = keydb_get_cert (hd, &cert);
if (rc)
{
log_error ("keydb_get_cert failed: %s\n", gpg_strerror (rc));
goto leave;
}
gpgsm_get_fingerprint (cert, 0, fpr, NULL);
rc = insert_duptable (dtable, fpr, &exists);
if (rc)
{
log_error ("inserting into duplicates table fauiled: %s\n",
gpg_strerror (rc));
goto leave;
}
if (!exists && count && !ctrl->create_pem)
{
log_info ("exporting more than one certificate "
"is not possible in binary mode\n");
log_info ("ignoring other certificates\n");
break;
}
if (!exists)
{
const unsigned char *image;
size_t imagelen;
image = ksba_cert_get_image (cert, &imagelen);
if (!image)
{
log_error ("ksba_cert_get_image failed\n");
goto leave;
}
if (ctrl->create_pem)
{
if (count)
{
if (stream)
es_putc ('\n', stream);
else
putc ('\n', fp);
}
print_short_info (cert, fp, stream);
if (stream)
es_putc ('\n', stream);
else
putc ('\n', fp);
}
count++;
if (!b64writer)
{
ctrl->pem_name = "CERTIFICATE";
rc = gpgsm_create_writer (&b64writer, ctrl, fp, stream, &writer);
if (rc)
{
log_error ("can't create writer: %s\n", gpg_strerror (rc));
goto leave;
}
}
rc = ksba_writer_write (writer, image, imagelen);
if (rc)
{
log_error ("write error: %s\n", gpg_strerror (rc));
goto leave;
}
if (ctrl->create_pem)
{
/* We want one certificate per PEM block */
rc = gpgsm_finish_writer (b64writer);
if (rc)
{
log_error ("write failed: %s\n", gpg_strerror (rc));
goto leave;
}
gpgsm_destroy_writer (b64writer);
b64writer = NULL;
}
}
ksba_cert_release (cert);
cert = NULL;
}
if (rc && rc != -1)
log_error ("keydb_search failed: %s\n", gpg_strerror (rc));
else if (b64writer)
{
rc = gpgsm_finish_writer (b64writer);
if (rc)
{
log_error ("write failed: %s\n", gpg_strerror (rc));
goto leave;
}
}
leave:
gpgsm_destroy_writer (b64writer);
ksba_cert_release (cert);
xfree (desc);
keydb_release (hd);
destroy_duptable (dtable);
}
/* Export a certificates and its private key. */
void
gpgsm_p12_export (ctrl_t ctrl, const char *name, FILE *fp)
{
KEYDB_HANDLE hd;
KEYDB_SEARCH_DESC *desc = NULL;
Base64Context b64writer = NULL;
ksba_writer_t writer;
ksba_cert_t cert = NULL;
int rc=0;
const unsigned char *image;
size_t imagelen;
char *keygrip = NULL;
char *prompt;
char buffer[1024];
int nread;
FILE *datafp = NULL;
hd = keydb_new (0);
if (!hd)
{
log_error ("keydb_new failed\n");
goto leave;
}
desc = xtrycalloc (1, sizeof *desc);
if (!desc)
{
log_error ("allocating memory for export failed: %s\n",
gpg_strerror (out_of_core ()));
goto leave;
}
rc = keydb_classify_name (name, desc);
if (rc)
{
log_error ("key `%s' not found: %s\n",
name, gpg_strerror (rc));
goto leave;
}
/* Lookup the certificate an make sure that it is unique. */
rc = keydb_search (hd, desc, 1);
if (!rc)
{
rc = keydb_get_cert (hd, &cert);
if (rc)
{
log_error ("keydb_get_cert failed: %s\n", gpg_strerror (rc));
goto leave;
}
next_ambiguous:
rc = keydb_search (hd, desc, 1);
if (!rc)
{
ksba_cert_t cert2 = NULL;
if (!keydb_get_cert (hd, &cert2))
{
if (gpgsm_certs_identical_p (cert, cert2))
{
ksba_cert_release (cert2);
goto next_ambiguous;
}
ksba_cert_release (cert2);
}
rc = gpg_error (GPG_ERR_AMBIGUOUS_NAME);
}
else if (rc == -1 || gpg_err_code (rc) == GPG_ERR_EOF)
rc = 0;
if (rc)
{
log_error ("key `%s' not found: %s\n",
name, gpg_strerror (rc));
goto leave;
}
}
keygrip = gpgsm_get_keygrip_hexstring (cert);
if (!keygrip || gpgsm_agent_havekey (ctrl, keygrip))
{
/* Note, that the !keygrip case indicates a bad certificate. */
rc = gpg_error (GPG_ERR_NO_SECKEY);
log_error ("can't export key `%s': %s\n", name, gpg_strerror (rc));
goto leave;
}
image = ksba_cert_get_image (cert, &imagelen);
if (!image)
{
log_error ("ksba_cert_get_image failed\n");
goto leave;
}
if (ctrl->create_pem)
{
print_short_info (cert, fp, NULL);
putc ('\n', fp);
}
if (opt.p12_charset && ctrl->create_pem)
{
fprintf (fp, "The passphrase is %s encoded.\n\n",
opt.p12_charset);
}
ctrl->pem_name = "PKCS12";
rc = gpgsm_create_writer (&b64writer, ctrl, fp, NULL, &writer);
if (rc)
{
log_error ("can't create writer: %s\n", gpg_strerror (rc));
goto leave;
}
prompt = gpgsm_format_keydesc (cert);
rc = export_p12 (ctrl, image, imagelen, prompt, keygrip, &datafp);
xfree (prompt);
if (rc)
goto leave;
rewind (datafp);
while ( (nread = fread (buffer, 1, sizeof buffer, datafp)) > 0 )
if ((rc = ksba_writer_write (writer, buffer, nread)))
{
log_error ("write failed: %s\n", gpg_strerror (rc));
goto leave;
}
if (ferror (datafp))
{
rc = gpg_error_from_errno (rc);
log_error ("error reading temporary file: %s\n", gpg_strerror (rc));
goto leave;
}
if (ctrl->create_pem)
{
/* We want one certificate per PEM block */
rc = gpgsm_finish_writer (b64writer);
if (rc)
{
log_error ("write failed: %s\n", gpg_strerror (rc));
goto leave;
}
gpgsm_destroy_writer (b64writer);
b64writer = NULL;
}
ksba_cert_release (cert);
cert = NULL;
leave:
if (datafp)
fclose (datafp);
gpgsm_destroy_writer (b64writer);
ksba_cert_release (cert);
xfree (desc);
keydb_release (hd);
}
/* Call either es_putc or the plain putc. */
static void
do_putc (int value, FILE *fp, estream_t stream)
{
if (stream)
es_putc (value, stream);
else
putc (value, fp);
}
/* Call either es_fputs or the plain fputs. */
static void
do_fputs (const char *string, FILE *fp, estream_t stream)
{
if (stream)
es_fputs (string, stream);
else
fputs (string, fp);
}
/* Print some info about the certifciate CERT to FP or STREAM */
static void
print_short_info (ksba_cert_t cert, FILE *fp, estream_t stream)
{
char *p;
ksba_sexp_t sexp;
int idx;
for (idx=0; (p = ksba_cert_get_issuer (cert, idx)); idx++)
{
do_fputs ((!idx
? "Issuer ...: "
: "\n aka ...: "), fp, stream);
if (stream)
gpgsm_es_print_name (stream, p);
else
gpgsm_print_name (fp, p);
xfree (p);
}
do_putc ('\n', fp, stream);
do_fputs ("Serial ...: ", fp, stream);
sexp = ksba_cert_get_serial (cert);
if (sexp)
{
int len;
const unsigned char *s = sexp;
if (*s == '(')
{
s++;
for (len=0; *s && *s != ':' && digitp (s); s++)
len = len*10 + atoi_1 (s);
if (*s == ':')
{
if (stream)
es_write_hexstring (stream, s+1, len, 0, NULL);
else
print_hexstring (fp, s+1, len, 0);
}
}
xfree (sexp);
}
do_putc ('\n', fp, stream);
for (idx=0; (p = ksba_cert_get_subject (cert, idx)); idx++)
{
do_fputs ((!idx
? "Subject ..: "
: "\n aka ..: "), fp, stream);
if (stream)
gpgsm_es_print_name (stream, p);
else
gpgsm_print_name (fp, p);
xfree (p);
}
do_putc ('\n', fp, stream);
}
static gpg_error_t
popen_protect_tool (const char *pgmname,
FILE *infile, FILE *outfile, FILE **statusfile,
const char *prompt, const char *keygrip,
pid_t *pid)
{
const char *argv[20];
int i=0;
argv[i++] = "--homedir";
argv[i++] = opt.homedir;
argv[i++] = "--p12-export";
argv[i++] = "--have-cert";
argv[i++] = "--prompt";
argv[i++] = prompt?prompt:"";
argv[i++] = "--enable-status-msg";
if (opt.p12_charset)
{
argv[i++] = "--p12-charset";
argv[i++] = opt.p12_charset;
}
argv[i++] = "--",
argv[i++] = keygrip,
argv[i] = NULL;
assert (i < sizeof argv);
return gnupg_spawn_process (pgmname, argv, infile, outfile,
setup_pinentry_env, 128,
statusfile, pid);
}
static gpg_error_t
export_p12 (ctrl_t ctrl, const unsigned char *certimg, size_t certimglen,
const char *prompt, const char *keygrip,
FILE **retfp)
{
const char *pgmname;
gpg_error_t err = 0, child_err = 0;
int c, cont_line;
unsigned int pos;
FILE *infp = NULL, *outfp = NULL, *fp = NULL;
char buffer[1024];
pid_t pid = -1;
int bad_pass = 0;
if (!opt.protect_tool_program || !*opt.protect_tool_program)
pgmname = gnupg_module_name (GNUPG_MODULE_NAME_PROTECT_TOOL);
else
pgmname = opt.protect_tool_program;
infp = gnupg_tmpfile ();
if (!infp)
{
err = gpg_error_from_syserror ();
log_error (_("error creating temporary file: %s\n"), strerror (errno));
goto cleanup;
}
if (fwrite (certimg, certimglen, 1, infp) != 1)
{
err = gpg_error_from_syserror ();
log_error (_("error writing to temporary file: %s\n"),
strerror (errno));
goto cleanup;
}
outfp = gnupg_tmpfile ();
if (!outfp)
{
err = gpg_error_from_syserror ();
log_error (_("error creating temporary file: %s\n"), strerror (errno));
goto cleanup;
}
err = popen_protect_tool (pgmname, infp, outfp, &fp, prompt, keygrip, &pid);
if (err)
{
pid = -1;
goto cleanup;
}
fclose (infp);
infp = NULL;
/* Read stderr of the protect tool. */
pos = 0;
cont_line = 0;
while ((c=getc (fp)) != EOF)
{
/* fixme: We could here grep for status information of the
protect tool to figure out better error codes for
CHILD_ERR. */
buffer[pos++] = c;
if (pos >= sizeof buffer - 5 || c == '\n')
{
buffer[pos - (c == '\n')] = 0;
if (cont_line)
log_printf ("%s", buffer);
else
{
if (!strncmp (buffer, "gpg-protect-tool: [PROTECT-TOOL:] ",34))
{
char *p, *pend;
p = buffer + 34;
pend = strchr (p, ' ');
if (pend)
*pend = 0;
if ( !strcmp (p, "bad-passphrase"))
bad_pass++;
}
else
log_info ("%s", buffer);
}
pos = 0;
cont_line = (c != '\n');
}
}
if (pos)
{
buffer[pos] = 0;
if (cont_line)
log_printf ("%s\n", buffer);
else
log_info ("%s\n", buffer);
}
else if (cont_line)
log_printf ("\n");
/* If we found no error in the output of the child, setup a suitable
error code, which will later be reset if the exit status of the
child is 0. */
if (!child_err)
child_err = gpg_error (GPG_ERR_DECRYPT_FAILED);
cleanup:
if (infp)
fclose (infp);
if (fp)
fclose (fp);
if (pid != -1)
{
if (!gnupg_wait_process (pgmname, pid, NULL))
child_err = 0;
}
if (!err)
err = child_err;
if (err)
{
if (outfp)
fclose (outfp);
}
else
*retfp = outfp;
if (bad_pass)
{
/* During export this is the passphrase used to unprotect the
key and not the pkcs#12 thing as in export. Therefore we can
issue the regular passphrase status. FIXME: replace the all
zero keyid by a regular one. */
gpgsm_status (ctrl, STATUS_BAD_PASSPHRASE, "0000000000000000");
}
return err;
}
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