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git://git.gnupg.org/gnupg.git
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This commit was manufactured by cvs2svn to create branch
'GNUPG-1-9-BRANCH'.
This commit is contained in:
Repo Admin
parent
eba8c18657
commit
9ca4830a5b
76 changed files with 34899 additions and 0 deletions
621
sm/sign.c
Normal file
621
sm/sign.c
Normal file
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@ -0,0 +1,621 @@
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/* sign.c - Sign a message
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* Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
|
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* the Free Software Foundation; either version 2 of the License, or
|
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
|
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* along with this program; if not, write to the Free Software
|
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <time.h>
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#include <assert.h>
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#include "gpgsm.h"
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#include <gcrypt.h>
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#include <ksba.h>
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#include "keydb.h"
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#include "i18n.h"
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static void
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hash_data (int fd, gcry_md_hd_t md)
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{
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FILE *fp;
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char buffer[4096];
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int nread;
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fp = fdopen ( dup (fd), "rb");
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if (!fp)
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{
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log_error ("fdopen(%d) failed: %s\n", fd, strerror (errno));
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return;
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}
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do
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{
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nread = fread (buffer, 1, DIM(buffer), fp);
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gcry_md_write (md, buffer, nread);
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}
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while (nread);
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if (ferror (fp))
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log_error ("read error on fd %d: %s\n", fd, strerror (errno));
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fclose (fp);
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}
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static int
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hash_and_copy_data (int fd, gcry_md_hd_t md, KsbaWriter writer)
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{
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KsbaError err;
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FILE *fp;
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char buffer[4096];
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int nread;
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int rc = 0;
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int any = 0;
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fp = fdopen ( dup (fd), "rb");
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if (!fp)
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{
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gpg_error_t tmperr = gpg_error (gpg_err_code_from_errno (errno));
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log_error ("fdopen(%d) failed: %s\n", fd, strerror (errno));
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return tmperr;
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}
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do
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{
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nread = fread (buffer, 1, DIM(buffer), fp);
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if (nread)
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{
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any = 1;
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gcry_md_write (md, buffer, nread);
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err = ksba_writer_write_octet_string (writer, buffer, nread, 0);
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if (err)
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{
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log_error ("write failed: %s\n", ksba_strerror (err));
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rc = map_ksba_err (err);
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}
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}
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}
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while (nread && !rc);
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if (ferror (fp))
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{
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rc = gpg_error (gpg_err_code_from_errno (errno));
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log_error ("read error on fd %d: %s\n", fd, strerror (errno));
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}
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fclose (fp);
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if (!any)
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{
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/* We can't allow to sign an empty message because it does not
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make much sense and more seriously, ksba-cms_build has
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already written the tag for data and now expects an octet
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string but an octet string of zeize 0 is illegal. */
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log_error ("cannot sign an empty message\n");
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rc = gpg_error (GPG_ERR_NO_DATA);
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}
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if (!rc)
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{
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err = ksba_writer_write_octet_string (writer, NULL, 0, 1);
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if (err)
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{
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log_error ("write failed: %s\n", ksba_strerror (err));
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rc = map_ksba_err (err);
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}
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}
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return rc;
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}
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/* Get the default certificate which is defined as the first one our
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keyDB retruns and has a secret key available */
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int
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gpgsm_get_default_cert (KsbaCert *r_cert)
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{
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KEYDB_HANDLE hd;
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KsbaCert cert = NULL;
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int rc;
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char *p;
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hd = keydb_new (0);
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if (!hd)
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return gpg_error (GPG_ERR_GENERAL);
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rc = keydb_search_first (hd);
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if (rc)
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{
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keydb_release (hd);
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return rc;
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}
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do
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{
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rc = keydb_get_cert (hd, &cert);
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if (rc)
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{
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log_error ("keydb_get_cert failed: %s\n", gpg_strerror (rc));
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keydb_release (hd);
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return rc;
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}
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p = gpgsm_get_keygrip_hexstring (cert);
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if (p)
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{
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if (!gpgsm_agent_havekey (p))
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{
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xfree (p);
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keydb_release (hd);
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*r_cert = cert;
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return 0; /* got it */
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}
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xfree (p);
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}
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ksba_cert_release (cert);
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cert = NULL;
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}
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while (!(rc = keydb_search_next (hd)));
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if (rc && rc != -1)
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log_error ("keydb_search_next failed: %s\n", gpg_strerror (rc));
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ksba_cert_release (cert);
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keydb_release (hd);
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return rc;
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}
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static KsbaCert
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get_default_signer (void)
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{
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KEYDB_SEARCH_DESC desc;
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KsbaCert cert = NULL;
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KEYDB_HANDLE kh = NULL;
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int rc;
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if (!opt.local_user)
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{
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rc = gpgsm_get_default_cert (&cert);
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if (rc)
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{
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if (rc != -1)
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log_debug ("failed to find default certificate: %s\n",
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gpg_strerror (rc));
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return NULL;
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}
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return cert;
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}
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rc = keydb_classify_name (opt.local_user, &desc);
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if (rc)
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{
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log_error ("failed to find default signer: %s\n", gpg_strerror (rc));
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return NULL;
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}
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kh = keydb_new (0);
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if (!kh)
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return NULL;
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rc = keydb_search (kh, &desc, 1);
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if (rc)
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{
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log_debug ("failed to find default certificate: rc=%d\n", rc);
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}
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else
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{
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rc = keydb_get_cert (kh, &cert);
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if (rc)
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{
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log_debug ("failed to get cert: rc=%d\n", rc);
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}
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}
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keydb_release (kh);
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return cert;
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}
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/* Depending on the options in CTRL add the certificate CERT as well as
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other certificate up in the chain to the Root-CA to the CMS
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object. */
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static int
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add_certificate_list (CTRL ctrl, KsbaCMS cms, KsbaCert cert)
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{
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KsbaError err;
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int rc = 0;
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KsbaCert next = NULL;
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int n;
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int not_root = 0;
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ksba_cert_ref (cert);
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n = ctrl->include_certs;
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if (n == -2)
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{
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not_root = 1;
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n = -1;
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}
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if (n < 0 || n > 50)
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n = 50; /* We better apply an upper bound */
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if (n)
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{
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if (not_root && gpgsm_is_root_cert (cert))
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err = 0;
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else
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err = ksba_cms_add_cert (cms, cert);
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if (err)
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goto ksba_failure;
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}
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while ( n-- && !(rc = gpgsm_walk_cert_chain (cert, &next)) )
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{
|
||||
if (not_root && gpgsm_is_root_cert (next))
|
||||
err = 0;
|
||||
else
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||||
err = ksba_cms_add_cert (cms, next);
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ksba_cert_release (cert);
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cert = next; next = NULL;
|
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if (err)
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goto ksba_failure;
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}
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ksba_cert_release (cert);
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||||
|
||||
return rc == -1? 0: rc;
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||||
ksba_failure:
|
||||
ksba_cert_release (cert);
|
||||
log_error ("ksba_cms_add_cert failed: %s\n", ksba_strerror (err));
|
||||
return map_ksba_err (err);
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||||
}
|
||||
|
||||
|
||||
|
||||
|
||||
/* Perform a sign operation.
|
||||
|
||||
Sign the data received on DATA-FD in embedded mode or in detached
|
||||
mode when DETACHED is true. Write the signature to OUT_FP. The
|
||||
keys used to sign are taken from SIGNERLIST or the default one will
|
||||
be used if the value of this argument is NULL. */
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int
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||||
gpgsm_sign (CTRL ctrl, CERTLIST signerlist,
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int data_fd, int detached, FILE *out_fp)
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||||
{
|
||||
int i, rc;
|
||||
KsbaError err;
|
||||
Base64Context b64writer = NULL;
|
||||
KsbaWriter writer;
|
||||
KsbaCMS cms = NULL;
|
||||
KsbaStopReason stopreason;
|
||||
KEYDB_HANDLE kh = NULL;
|
||||
gcry_md_hd_t data_md = NULL;
|
||||
int signer;
|
||||
const char *algoid;
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||||
int algo;
|
||||
time_t signed_at;
|
||||
CERTLIST cl;
|
||||
int release_signerlist = 0;
|
||||
|
||||
kh = keydb_new (0);
|
||||
if (!kh)
|
||||
{
|
||||
log_error (_("failed to allocated keyDB handle\n"));
|
||||
rc = gpg_error (GPG_ERR_GENERAL);
|
||||
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", gpg_strerror (rc));
|
||||
goto leave;
|
||||
}
|
||||
|
||||
cms = ksba_cms_new ();
|
||||
if (!cms)
|
||||
{
|
||||
rc = gpg_error (GPG_ERR_ENOMEM);
|
||||
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;
|
||||
}
|
||||
|
||||
/* If no list of signers is given, use a default one. */
|
||||
if (!signerlist)
|
||||
{
|
||||
KsbaCert cert = get_default_signer ();
|
||||
if (!cert)
|
||||
{
|
||||
log_error ("no default signer found\n");
|
||||
rc = gpg_error (GPG_ERR_GENERAL);
|
||||
goto leave;
|
||||
}
|
||||
signerlist = xtrycalloc (1, sizeof *signerlist);
|
||||
if (!signerlist)
|
||||
{
|
||||
rc = OUT_OF_CORE (errno);
|
||||
ksba_cert_release (cert);
|
||||
goto leave;
|
||||
}
|
||||
signerlist->cert = cert;
|
||||
release_signerlist = 1;
|
||||
}
|
||||
|
||||
|
||||
/* Gather certificates of signers and store them in the CMS object. */
|
||||
for (cl=signerlist; cl; cl = cl->next)
|
||||
{
|
||||
rc = gpgsm_cert_use_sign_p (cl->cert);
|
||||
if (rc)
|
||||
goto leave;
|
||||
|
||||
err = ksba_cms_add_signer (cms, cl->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, cl->cert);
|
||||
if (rc)
|
||||
{
|
||||
log_error ("failed to store list of certificates: %s\n",
|
||||
gpg_strerror(rc));
|
||||
goto leave;
|
||||
}
|
||||
/* 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)*/
|
||||
rc = gcry_md_open (&data_md, 0, 0);
|
||||
if (rc)
|
||||
{
|
||||
log_error ("md_open failed: %s\n", gpg_strerror (rc));
|
||||
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 = gpg_error (GPG_ERR_BUG);
|
||||
goto leave;
|
||||
}
|
||||
gcry_md_enable (data_md, algo);
|
||||
}
|
||||
|
||||
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 = gpg_error (GPG_ERR_BUG);
|
||||
goto leave;
|
||||
}
|
||||
for (cl=signerlist,signer=0; cl; cl = cl->next, signer++)
|
||||
{
|
||||
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 = gnupg_get_time ();
|
||||
for (cl=signerlist,signer=0; cl; cl = cl->next, signer++)
|
||||
{
|
||||
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 */
|
||||
unsigned char *digest;
|
||||
size_t digest_len;
|
||||
|
||||
assert (!detached);
|
||||
/* Fixme: get the algo to use from the signer's certificate
|
||||
- does not make much sense, but we should do this
|
||||
consistent as we have already done it above. Code is
|
||||
mostly duplicated above. */
|
||||
|
||||
algo = GCRY_MD_SHA1;
|
||||
rc = hash_and_copy_data (data_fd, data_md, writer);
|
||||
if (rc)
|
||||
goto leave;
|
||||
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 = gpg_error (GPG_ERR_BUG);
|
||||
goto leave;
|
||||
}
|
||||
for (cl=signerlist,signer=0; cl; cl = cl->next, signer++)
|
||||
{
|
||||
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;
|
||||
}
|
||||
}
|
||||
}
|
||||
else if (stopreason == KSBA_SR_NEED_SIG)
|
||||
{ /* calculate the signature for all signers */
|
||||
gcry_md_hd_t md;
|
||||
|
||||
algo = GCRY_MD_SHA1;
|
||||
rc = gcry_md_open (&md, algo, 0);
|
||||
if (rc)
|
||||
{
|
||||
log_error ("md_open failed: %s\n", gpg_strerror (rc));
|
||||
goto leave;
|
||||
}
|
||||
if (DBG_HASHING)
|
||||
gcry_md_start_debug (md, "sign.attr");
|
||||
ksba_cms_set_hash_function (cms, HASH_FNC, md);
|
||||
for (cl=signerlist,signer=0; cl; cl = cl->next, signer++)
|
||||
{
|
||||
char *sigval = NULL;
|
||||
char *buf, *fpr;
|
||||
|
||||
if (signer)
|
||||
gcry_md_reset (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;
|
||||
}
|
||||
|
||||
rc = gpgsm_create_cms_signature (cl->cert, md, algo, &sigval);
|
||||
if (rc)
|
||||
{
|
||||
gcry_md_close (md);
|
||||
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);
|
||||
gcry_md_close (md);
|
||||
goto leave;
|
||||
}
|
||||
|
||||
/* write a status message */
|
||||
fpr = gpgsm_get_fingerprint_hexstring (cl->cert, GCRY_MD_SHA1);
|
||||
if (!fpr)
|
||||
{
|
||||
rc = gpg_error (GPG_ERR_ENOMEM);
|
||||
gcry_md_close (md);
|
||||
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 = gpg_error (GPG_ERR_ENOMEM);
|
||||
gcry_md_close (md);
|
||||
goto leave;
|
||||
}
|
||||
rc = 0;
|
||||
gpgsm_status (ctrl, STATUS_SIG_CREATED, buf);
|
||||
free (buf); /* yes, we must use the regular free() here */
|
||||
}
|
||||
gcry_md_close (md);
|
||||
|
||||
}
|
||||
}
|
||||
while (stopreason != KSBA_SR_READY);
|
||||
|
||||
rc = gpgsm_finish_writer (b64writer);
|
||||
if (rc)
|
||||
{
|
||||
log_error ("write failed: %s\n", gpg_strerror (rc));
|
||||
goto leave;
|
||||
}
|
||||
|
||||
log_info ("signature created\n");
|
||||
|
||||
|
||||
leave:
|
||||
if (release_signerlist)
|
||||
gpgsm_release_certlist (signerlist);
|
||||
ksba_cms_release (cms);
|
||||
gpgsm_destroy_writer (b64writer);
|
||||
keydb_release (kh);
|
||||
gcry_md_close (data_md);
|
||||
return rc;
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue