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gnupg/sm/sign.c

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/* sign.c - Sign a message
* Copyright (C) 2001 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include <assert.h>
#include <gcrypt.h>
#include <ksba.h>
#include "gpgsm.h"
#include "keydb.h"
#include "i18n.h"
static void
hash_data (int fd, GCRY_MD_HD md)
{
FILE *fp;
char buffer[4096];
int nread;
fp = fdopen ( dup (fd), "rb");
if (!fp)
{
log_error ("fdopen(%d) failed: %s\n", fd, strerror (errno));
return;
}
do
{
nread = fread (buffer, 1, DIM(buffer), fp);
gcry_md_write (md, buffer, nread);
}
while (nread);
if (ferror (fp))
log_error ("read error on fd %d: %s\n", fd, strerror (errno));
fclose (fp);
}
/* Get the default certificate which is defined as the first one our
keyDB retruns and has a secret key available */
int
gpgsm_get_default_cert (KsbaCert *r_cert)
{
KEYDB_HANDLE hd;
KsbaCert cert = NULL;
int rc;
char *p;
hd = keydb_new (0);
if (!hd)
return GNUPG_General_Error;
rc = keydb_search_first (hd);
if (rc)
{
keydb_release (hd);
return rc;
}
do
{
rc = keydb_get_cert (hd, &cert);
if (rc)
{
log_error ("keydb_get_cert failed: %s\n", gnupg_strerror (rc));
keydb_release (hd);
return rc;
}
p = gpgsm_get_keygrip_hexstring (cert);
if (p)
{
if (!gpgsm_agent_havekey (p))
{
xfree (p);
keydb_release (hd);
*r_cert = cert;
return 0; /* got it */
}
xfree (p);
}
ksba_cert_release (cert);
cert = NULL;
}
while (!(rc = keydb_search_next (hd)));
if (rc && rc != -1)
log_error ("keydb_search_next failed: %s\n", gnupg_strerror (rc));
ksba_cert_release (cert);
keydb_release (hd);
return rc;
}
static KsbaCert
get_default_signer (void)
{
KEYDB_SEARCH_DESC desc;
KsbaCert cert = NULL;
KEYDB_HANDLE kh = NULL;
int rc;
if (!opt.local_user)
{
rc = gpgsm_get_default_cert (&cert);
if (rc)
{
if (rc != -1)
log_debug ("failed to find default certificate: %s\n",
gnupg_strerror (rc));
return NULL;
}
return cert;
}
rc = keydb_classify_name (opt.local_user, &desc);
if (rc)
{
log_error ("failed to find default signer: %s\n", gnupg_strerror (rc));
return NULL;
}
kh = keydb_new (0);
if (!kh)
return NULL;
rc = keydb_search (kh, &desc, 1);
if (rc)
{
log_debug ("failed to find default certificate: rc=%d\n", rc);
}
else
{
rc = keydb_get_cert (kh, &cert);
if (rc)
{
log_debug ("failed to get cert: rc=%d\n", rc);
}
}
keydb_release (kh);
return cert;
}
/* Depending on the options in CTRL add the certificate CERT as well as
other certificate up in the chain to the Root-CA to the CMS
object. */
static int
add_certificate_list (CTRL ctrl, KsbaCMS cms, KsbaCert cert)
{
KsbaError err;
int rc = 0;
KsbaCert next = NULL;
int n;
int not_root = 0;
ksba_cert_ref (cert);
n = ctrl->include_certs;
if (n == -2)
{
not_root = 1;
n = -1;
}
if (n < 0 || n > 50)
n = 50; /* We better apply an upper bound */
if (n)
{
if (not_root && gpgsm_is_root_cert (cert))
err = 0;
else
err = ksba_cms_add_cert (cms, cert);
if (err)
goto ksba_failure;
}
while ( n-- && !(rc = gpgsm_walk_cert_chain (cert, &next)) )
{
if (not_root && gpgsm_is_root_cert (next))
err = 0;
else
err = ksba_cms_add_cert (cms, next);
ksba_cert_release (cert);
cert = next; next = NULL;
if (err)
goto ksba_failure;
}
ksba_cert_release (cert);
return rc == -1? 0: rc;
ksba_failure:
ksba_cert_release (cert);
log_error ("ksba_cms_add_cert failed: %s\n", ksba_strerror (err));
return map_ksba_err (err);
}
/* Perform a sign operation.
Sign the data received on DATA-FD in embedded mode or in deatched
mode when DETACHED is true. Write the signature to OUT_FP The key
used to sign is the default - we will extend the fucntion to take a
list of fingerprints in the future. */
int
gpgsm_sign (CTRL ctrl, int data_fd, int detached, FILE *out_fp)
{
int i, rc;
KsbaError err;
Base64Context b64writer = NULL;
KsbaWriter writer;
KsbaCMS cms = NULL;
KsbaStopReason stopreason;
KsbaCert cert = NULL;
KEYDB_HANDLE kh = NULL;
GCRY_MD_HD data_md = NULL;
int signer;
const char *algoid;
int algo;
time_t signed_at;
if (!detached)
{
rc = seterr (Not_Implemented);
goto leave;
}
kh = keydb_new (0);
if (!kh)
{
log_error (_("failed to allocated keyDB handle\n"));
rc = GNUPG_General_Error;
goto leave;
}
ctrl->pem_name = "SIGNED MESSAGE";
rc = gpgsm_create_writer (&b64writer, ctrl, out_fp, &writer);
if (rc)
{
log_error ("can't create writer: %s\n", gnupg_strerror (rc));
goto leave;
}
cms = ksba_cms_new ();
if (!cms)
{
rc = seterr (Out_Of_Core);
goto leave;
}
err = ksba_cms_set_reader_writer (cms, NULL, writer);
if (err)
{
log_debug ("ksba_cms_set_reader_writer failed: %s\n",
ksba_strerror (err));
rc = map_ksba_err (err);
goto leave;
}
/* We are going to create signed data with data as encap. content */
err = ksba_cms_set_content_type (cms, 0, KSBA_CT_SIGNED_DATA);
if (!err)
err = ksba_cms_set_content_type (cms, 1, KSBA_CT_DATA);
if (err)
{
log_debug ("ksba_cms_set_content_type failed: %s\n",
ksba_strerror (err));
rc = map_ksba_err (err);
goto leave;
}
/* gather certificates of signers and store in theCMS object */
/* fixme: process a list of fingerprints and store the certificate of
each given fingerprint */
cert = get_default_signer ();
if (!cert)
{
log_error ("no default signer found\n");
rc = seterr (General_Error);
goto leave;
}
rc = gpgsm_cert_use_sign_p (cert);
if (rc)
goto leave;
err = ksba_cms_add_signer (cms, cert);
if (err)
{
log_error ("ksba_cms_add_signer failed: %s\n", ksba_strerror (err));
rc = map_ksba_err (err);
goto leave;
}
rc = add_certificate_list (ctrl, cms, cert);
if (rc)
{
log_error ("failed to store list of certificates: %s\n",
gnupg_strerror(rc));
goto leave;
}
ksba_cert_release (cert); cert = NULL;
/* Set the hash algorithm we are going to use */
err = ksba_cms_add_digest_algo (cms, "1.3.14.3.2.26" /*SHA-1*/);
if (err)
{
log_debug ("ksba_cms_add_digest_algo failed: %s\n", ksba_strerror (err));
rc = map_ksba_err (err);
goto leave;
}
/* Prepare hashing (actually we are figuring out what we have set above)*/
data_md = gcry_md_open (0, 0);
if (!data_md)
{
rc = map_gcry_err (gcry_errno());
log_error ("md_open failed: %s\n", gcry_strerror (-1));
goto leave;
}
if (DBG_HASHING)
gcry_md_start_debug (data_md, "sign.data");
for (i=0; (algoid=ksba_cms_get_digest_algo_list (cms, i)); i++)
{
algo = gcry_md_map_name (algoid);
if (!algo)
{
log_error ("unknown hash algorithm `%s'\n", algoid? algoid:"?");
rc = GNUPG_Bug;
goto leave;
}
gcry_md_enable (data_md, algo);
}
signer = 0;
if (detached)
{ /* we hash the data right now so that we can store the message
digest. ksba_cms_build() takes this as an flag that detached
data is expected. */
unsigned char *digest;
size_t digest_len;
/* Fixme do this for all signers and get the algo to use from
the signer's certificate - does not make mich sense, bu we
should do this consistent as we have already done it above */
algo = GCRY_MD_SHA1;
hash_data (data_fd, data_md);
digest = gcry_md_read (data_md, algo);
digest_len = gcry_md_get_algo_dlen (algo);
if ( !digest || !digest_len)
{
log_error ("problem getting the hash of the data\n");
rc = GNUPG_Bug;
goto leave;
}
err = ksba_cms_set_message_digest (cms, signer, digest, digest_len);
if (err)
{
log_error ("ksba_cms_set_message_digest failed: %s\n",
ksba_strerror (err));
rc = map_ksba_err (err);
goto leave;
}
}
signed_at = time (NULL);
err = ksba_cms_set_signing_time (cms, signer, signed_at);
if (err)
{
log_error ("ksba_cms_set_signing_time failed: %s\n",
ksba_strerror (err));
rc = map_ksba_err (err);
goto leave;
}
do
{
err = ksba_cms_build (cms, &stopreason);
if (err)
{
log_debug ("ksba_cms_build failed: %s\n", ksba_strerror (err));
rc = map_ksba_err (err);
goto leave;
}
if (stopreason == KSBA_SR_BEGIN_DATA)
{ /* hash the data and store the message digest */
assert (!detached);
}
else if (stopreason == KSBA_SR_NEED_SIG)
{ /* calculate the signature for all signers */
GCRY_MD_HD md;
algo = GCRY_MD_SHA1;
signer = 0;
md = gcry_md_open (algo, 0);
if (DBG_HASHING)
gcry_md_start_debug (md, "sign.attr");
if (!md)
{
log_error ("md_open failed: %s\n", gcry_strerror (-1));
goto leave;
}
ksba_cms_set_hash_function (cms, HASH_FNC, md);
rc = ksba_cms_hash_signed_attrs (cms, signer);
if (rc)
{
log_debug ("hashing signed attrs failed: %s\n",
ksba_strerror (rc));
gcry_md_close (md);
goto leave;
}
{ /* This is all an temporary hack */
char *sigval;
ksba_cert_release (cert);
cert = get_default_signer ();
if (!cert)
{
log_error ("oops - failed to get cert again\n");
rc = seterr (General_Error);
goto leave;
}
sigval = NULL;
rc = gpgsm_create_cms_signature (cert, md, algo, &sigval);
if (rc)
goto leave;
err = ksba_cms_set_sig_val (cms, signer, sigval);
xfree (sigval);
if (err)
{
log_error ("failed to store the signature: %s\n",
ksba_strerror (err));
rc = map_ksba_err (err);
goto leave;
}
/* And write a status message */
{
char *buf, *fpr;
fpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
if (!fpr)
{
rc = seterr (Out_Of_Core);
goto leave;
}
rc = asprintf (&buf, "%c %d %d 00 %lu %s",
detached? 'D':'S',
GCRY_PK_RSA, /* FIXME: get pk algo from cert */
algo,
(ulong)signed_at,
fpr);
xfree (fpr);
if (rc < 0)
{
rc = seterr (Out_Of_Core);
goto leave;
}
rc = 0;
gpgsm_status (ctrl, STATUS_SIG_CREATED, buf );
free (buf); /* yes, we must use the regular free() here */
}
}
}
}
while (stopreason != KSBA_SR_READY);
rc = gpgsm_finish_writer (b64writer);
if (rc)
{
log_error ("write failed: %s\n", gnupg_strerror (rc));
goto leave;
}
log_info ("signature created\n");
leave:
ksba_cert_release (cert);
ksba_cms_release (cms);
gpgsm_destroy_writer (b64writer);
keydb_release (kh);
gcry_md_close (data_md);
return rc;
}
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