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![Werner Koch](/assets/img/avatar_default.png)
* sm/gpgsm.h (MAX_FINGERPRINT_LEN): New. * sm/keydb.c (struct keydb_local_s): Change definition of search_result. (keydb_get_cert): Implement keyboxd mode. (keydb_get_flags): Temporary hack for keyboxd mode. Needs to be fixed. (struct store_parm_s, store_inq_cb): New. (keydb_insert_cert): Implement keyboxd mode. (keydb_locate_writable): Make static. (keydb_search_reset): Implement keyboxd mode. (search_status_cb): New. (keydb_search): Implement keyboxd mode. Replace return code -1 by GPG_ERR_NOT_FOUND. (keydb_set_cert_flags): Replace return code -1 by GPG_ERR_NOT_FOUND. * sm/keylist.c (list_cert_colon): Adjust for replacement of -1 by GPG_ERR_NOT_FOUND. (list_internal_keys): Ditto. * sm/sign.c (add_certificate_list): Ditto. * sm/certchain.c (find_up_search_by_keyid): Ditto. (find_up_external, find_up, find_up_dirmngr): Ditto. (gpgsm_walk_cert_chain): Ditto. (get_regtp_ca_info): Ditto. * sm/certlist.c (gpgsm_add_to_certlist): Ditto. (gpgsm_find_cert): Ditto. * sm/delete.c (delete_one): Ditto. * sm/export.c (gpgsm_export): Ditto. (gpgsm_p12_export): Ditto. * sm/import.c (gpgsm_import_files): Ditto. -- Note that keyboxd is not yet able to handle the ephemeral flag. This needs fixing here and in keyboxd. Delete et al. is also not yet implemented. A basic key listing works, though. Signed-off-by: Werner Koch <wk@gnupg.org>
963 lines
27 KiB
C
963 lines
27 KiB
C
/* sign.c - Sign a message
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* Copyright (C) 2001, 2002, 2003, 2008,
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* 2010 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 3 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, see <https://www.gnu.org/licenses/>.
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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 "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 "../common/i18n.h"
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/* Hash the data and return if something was hashed. Return -1 on error. */
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static int
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hash_data (int fd, gcry_md_hd_t md)
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{
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estream_t 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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fp = es_fdopen_nc (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 -1;
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}
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do
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{
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nread = es_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 (es_ferror (fp))
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{
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log_error ("read error on fd %d: %s\n", fd, strerror (errno));
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rc = -1;
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}
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es_fclose (fp);
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return rc;
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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, ksba_writer_t writer)
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{
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gpg_error_t err;
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estream_t 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 = es_fdopen_nc (fd, "rb");
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if (!fp)
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{
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gpg_error_t tmperr = gpg_error_from_syserror ();
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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 = es_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", gpg_strerror (err));
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rc = 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 (es_ferror (fp))
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{
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rc = gpg_error_from_syserror ();
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log_error ("read error on fd %d: %s\n", fd, strerror (errno));
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}
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es_fclose (fp);
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if (!any)
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{
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/* We can't allow signing 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 and an octet string of size 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", gpg_strerror (err));
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rc = 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
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certificate capable of signing returned by the keyDB and has a
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secret key available. */
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int
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gpgsm_get_default_cert (ctrl_t ctrl, ksba_cert_t *r_cert)
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{
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KEYDB_HANDLE hd;
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ksba_cert_t cert = NULL;
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int rc;
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char *p;
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hd = keydb_new (ctrl);
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if (!hd)
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return gpg_error (GPG_ERR_GENERAL);
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rc = keydb_search_first (ctrl, 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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if (!gpgsm_cert_use_sign_p (cert, 1))
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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 (ctrl, 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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}
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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 (ctrl, 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 ksba_cert_t
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get_default_signer (ctrl_t ctrl)
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{
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KEYDB_SEARCH_DESC desc;
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ksba_cert_t 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 (ctrl, &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 = classify_user_id (opt.local_user, &desc, 0);
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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 (ctrl);
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if (!kh)
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return NULL;
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rc = keydb_search (ctrl, 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_t ctrl, ksba_cms_t cms, ksba_cert_t cert)
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{
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gpg_error_t err;
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int rc = 0;
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ksba_cert_t 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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/* First add my own certificate unless we don't want any certificate
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included at all. */
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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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if (n>0)
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n--;
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}
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/* Walk the chain to include all other certificates. Note that a -1
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used for N makes sure that there is no limit and all certs get
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included. */
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while ( n-- && !(rc = gpgsm_walk_cert_chain (ctrl, cert, &next)) )
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{
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if (not_root && gpgsm_is_root_cert (next))
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err = 0;
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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 gpg_err_code (rc) == GPG_ERR_NOT_FOUND? 0 : rc;
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ksba_failure:
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ksba_cert_release (cert);
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log_error ("ksba_cms_add_cert failed: %s\n", gpg_strerror (err));
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return err;
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}
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#if KSBA_VERSION_NUMBER >= 0x010400 && 0 /* 1.4.0 */
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static gpg_error_t
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add_signed_attribute (ksba_cms_t cms, const char *attrstr)
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{
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gpg_error_t err;
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char **fields = NULL;
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const char *s;
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int i;
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unsigned char *der = NULL;
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size_t derlen;
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fields = strtokenize (attrstr, ":");
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if (!fields)
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{
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err = gpg_error_from_syserror ();
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log_error ("strtokenize failed: %s\n", gpg_strerror (err));
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goto leave;
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}
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for (i=0; fields[i]; i++)
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;
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if (i != 3)
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{
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err = gpg_error (GPG_ERR_SYNTAX);
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log_error ("invalid attribute specification '%s': %s\n",
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attrstr, i < 3 ? "not enough fields":"too many fields");
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goto leave;
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}
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if (!ascii_strcasecmp (fields[1], "u"))
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{
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err = 0;
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goto leave; /* Skip unsigned attributes. */
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}
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if (ascii_strcasecmp (fields[1], "s"))
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{
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err = gpg_error (GPG_ERR_SYNTAX);
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log_error ("invalid attribute specification '%s': %s\n",
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attrstr, "type is not 's' or 'u'");
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goto leave;
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}
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/* Check that the OID is valid. */
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err = ksba_oid_from_str (fields[0], &der, &derlen);
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if (err)
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{
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log_error ("invalid attribute specification '%s': %s\n",
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attrstr, gpg_strerror (err));
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goto leave;
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}
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xfree (der);
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der = NULL;
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if (strchr (fields[2], '/'))
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{
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/* FIXME: read from file. */
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}
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else /* Directly given in hex. */
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{
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for (i=0, s = fields[2]; hexdigitp (s); s++, i++)
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;
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if (*s || !i || (i&1))
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{
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log_error ("invalid attribute specification '%s': %s\n",
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attrstr, "invalid hex encoding of the data");
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err = gpg_error (GPG_ERR_SYNTAX);
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goto leave;
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}
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der = xtrystrdup (fields[2]);
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if (!der)
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{
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err = gpg_error_from_syserror ();
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log_error ("malloc failed: %s\n", gpg_strerror (err));
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goto leave;
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}
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for (s=fields[2], derlen=0; s[0] && s[1]; s += 2)
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der[derlen++] = xtoi_2 (s);
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}
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/* Store the data in the CMS object for all signers. */
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err = ksba_cms_add_attribute (cms, -1, fields[0], 0, der, derlen);
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if (err)
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{
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log_error ("invalid attribute specification '%s': %s\n",
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attrstr, gpg_strerror (err));
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goto leave;
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}
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leave:
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xfree (der);
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xfree (fields);
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return err;
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}
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#endif /*ksba >= 1.4.0 */
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/* Perform a sign operation.
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Sign the data received on DATA-FD in embedded mode or in detached
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mode when DETACHED is true. Write the signature to OUT_FP. The
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keys used to sign are taken from SIGNERLIST or the default one will
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be used if the value of this argument is NULL. */
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int
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gpgsm_sign (ctrl_t ctrl, certlist_t signerlist,
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int data_fd, int detached, estream_t out_fp)
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{
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int i, rc;
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gpg_error_t err;
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gnupg_ksba_io_t b64writer = NULL;
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ksba_writer_t writer;
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ksba_cms_t cms = NULL;
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ksba_stop_reason_t stopreason;
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KEYDB_HANDLE kh = NULL;
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gcry_md_hd_t data_md = NULL;
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int signer;
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const char *algoid;
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int algo;
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ksba_isotime_t signed_at;
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certlist_t cl;
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int release_signerlist = 0;
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audit_set_type (ctrl->audit, AUDIT_TYPE_SIGN);
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kh = keydb_new (ctrl);
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if (!kh)
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{
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log_error (_("failed to allocate keyDB handle\n"));
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rc = gpg_error (GPG_ERR_GENERAL);
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goto leave;
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}
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if (!gnupg_rng_is_compliant (opt.compliance))
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{
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rc = gpg_error (GPG_ERR_FORBIDDEN);
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log_error (_("%s is not compliant with %s mode\n"),
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"RNG",
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gnupg_compliance_option_string (opt.compliance));
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gpgsm_status_with_error (ctrl, STATUS_ERROR,
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"random-compliance", rc);
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goto leave;
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}
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ctrl->pem_name = "SIGNED MESSAGE";
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rc = gnupg_ksba_create_writer
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(&b64writer, ((ctrl->create_pem? GNUPG_KSBA_IO_PEM : 0)
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| (ctrl->create_base64? GNUPG_KSBA_IO_BASE64 : 0)),
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ctrl->pem_name, out_fp, &writer);
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if (rc)
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{
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log_error ("can't create writer: %s\n", gpg_strerror (rc));
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goto leave;
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}
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err = ksba_cms_new (&cms);
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if (err)
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{
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rc = err;
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goto leave;
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}
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err = ksba_cms_set_reader_writer (cms, NULL, writer);
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if (err)
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{
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log_debug ("ksba_cms_set_reader_writer failed: %s\n",
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gpg_strerror (err));
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rc = err;
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goto leave;
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}
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/* We are going to create signed data with data as encap. content.
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* In authenticode mode we use spcIndirectDataContext instead. */
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err = ksba_cms_set_content_type (cms, 0, KSBA_CT_SIGNED_DATA);
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if (!err)
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err = ksba_cms_set_content_type
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(cms, 1,
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#if KSBA_VERSION_NUMBER >= 0x010400 && 0
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opt.authenticode? KSBA_CT_SPC_IND_DATA_CTX :
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#endif
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KSBA_CT_DATA
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);
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if (err)
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{
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log_debug ("ksba_cms_set_content_type failed: %s\n",
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gpg_strerror (err));
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rc = err;
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goto leave;
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}
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|
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/* If no list of signers is given, use the default certificate. */
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if (!signerlist)
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{
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ksba_cert_t cert = get_default_signer (ctrl);
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if (!cert)
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{
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log_error ("no default signer found\n");
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gpgsm_status2 (ctrl, STATUS_INV_SGNR,
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get_inv_recpsgnr_code (GPG_ERR_NO_SECKEY), NULL);
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rc = gpg_error (GPG_ERR_GENERAL);
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goto leave;
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}
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|
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/* Although we don't check for ambiguous specification we will
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check that the signer's certificate is usable and valid. */
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rc = gpgsm_cert_use_sign_p (cert, 0);
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if (!rc)
|
||
rc = gpgsm_validate_chain (ctrl, cert, "", NULL, 0, NULL, 0, NULL);
|
||
if (rc)
|
||
{
|
||
char *tmpfpr;
|
||
|
||
tmpfpr = gpgsm_get_fingerprint_hexstring (cert, 0);
|
||
gpgsm_status2 (ctrl, STATUS_INV_SGNR,
|
||
get_inv_recpsgnr_code (rc), tmpfpr, NULL);
|
||
xfree (tmpfpr);
|
||
goto leave;
|
||
}
|
||
|
||
/* That one is fine - create signerlist. */
|
||
signerlist = xtrycalloc (1, sizeof *signerlist);
|
||
if (!signerlist)
|
||
{
|
||
rc = out_of_core ();
|
||
ksba_cert_release (cert);
|
||
goto leave;
|
||
}
|
||
signerlist->cert = cert;
|
||
release_signerlist = 1;
|
||
}
|
||
|
||
|
||
/* Figure out the hash algorithm to use. We do not want to use the
|
||
one for the certificate but if possible an OID for the plain
|
||
algorithm. */
|
||
if (opt.forced_digest_algo && opt.verbose)
|
||
log_info ("user requested hash algorithm %d\n", opt.forced_digest_algo);
|
||
for (i=0, cl=signerlist; cl; cl = cl->next, i++)
|
||
{
|
||
const char *oid;
|
||
unsigned int nbits;
|
||
int pk_algo;
|
||
|
||
pk_algo = gpgsm_get_key_algo_info (cl->cert, &nbits);
|
||
cl->pk_algo = pk_algo;
|
||
|
||
if (opt.forced_digest_algo)
|
||
{
|
||
oid = NULL;
|
||
cl->hash_algo = opt.forced_digest_algo;
|
||
}
|
||
else
|
||
{
|
||
if (pk_algo == GCRY_PK_ECC)
|
||
{
|
||
/* Map the Curve to a corresponding hash algo. */
|
||
if (nbits <= 256)
|
||
oid = "2.16.840.1.101.3.4.2.1"; /* sha256 */
|
||
else if (nbits <= 384)
|
||
oid = "2.16.840.1.101.3.4.2.2"; /* sha384 */
|
||
else
|
||
oid = "2.16.840.1.101.3.4.2.3"; /* sha512 */
|
||
}
|
||
else
|
||
{
|
||
/* For RSA we reuse the hash algo used by the certificate. */
|
||
oid = ksba_cert_get_digest_algo (cl->cert);
|
||
}
|
||
cl->hash_algo = oid ? gcry_md_map_name (oid) : 0;
|
||
}
|
||
switch (cl->hash_algo)
|
||
{
|
||
case GCRY_MD_SHA1: oid = "1.3.14.3.2.26"; break;
|
||
case GCRY_MD_RMD160: oid = "1.3.36.3.2.1"; break;
|
||
case GCRY_MD_SHA224: oid = "2.16.840.1.101.3.4.2.4"; break;
|
||
case GCRY_MD_SHA256: oid = "2.16.840.1.101.3.4.2.1"; break;
|
||
case GCRY_MD_SHA384: oid = "2.16.840.1.101.3.4.2.2"; break;
|
||
case GCRY_MD_SHA512: oid = "2.16.840.1.101.3.4.2.3"; break;
|
||
/* case GCRY_MD_WHIRLPOOL: oid = "No OID yet"; break; */
|
||
|
||
case GCRY_MD_MD5: /* We don't want to use MD5. */
|
||
case 0: /* No algorithm found in cert. */
|
||
default: /* Other algorithms. */
|
||
log_info (_("hash algorithm %d (%s) for signer %d not supported;"
|
||
" using %s\n"),
|
||
cl->hash_algo, oid? oid: "?", i,
|
||
gcry_md_algo_name (GCRY_MD_SHA1));
|
||
cl->hash_algo = GCRY_MD_SHA1;
|
||
oid = "1.3.14.3.2.26";
|
||
break;
|
||
}
|
||
cl->hash_algo_oid = oid;
|
||
|
||
/* Check compliance. */
|
||
if (! gnupg_digest_is_allowed (opt.compliance, 1, cl->hash_algo))
|
||
{
|
||
log_error (_("digest algorithm '%s' may not be used in %s mode\n"),
|
||
gcry_md_algo_name (cl->hash_algo),
|
||
gnupg_compliance_option_string (opt.compliance));
|
||
err = gpg_error (GPG_ERR_DIGEST_ALGO);
|
||
goto leave;
|
||
}
|
||
|
||
if (! gnupg_pk_is_allowed (opt.compliance, PK_USE_SIGNING, pk_algo, 0,
|
||
NULL, nbits, NULL))
|
||
{
|
||
char kidstr[10+1];
|
||
|
||
snprintf (kidstr, sizeof kidstr, "0x%08lX",
|
||
gpgsm_get_short_fingerprint (cl->cert, NULL));
|
||
log_error (_("key %s may not be used for signing in %s mode\n"),
|
||
kidstr,
|
||
gnupg_compliance_option_string (opt.compliance));
|
||
err = gpg_error (GPG_ERR_PUBKEY_ALGO);
|
||
goto leave;
|
||
}
|
||
|
||
}
|
||
|
||
if (opt.verbose > 1 || opt.debug)
|
||
{
|
||
for (i=0, cl=signerlist; cl; cl = cl->next, i++)
|
||
log_info (_("hash algorithm used for signer %d: %s (%s)\n"),
|
||
i, gcry_md_algo_name (cl->hash_algo), cl->hash_algo_oid);
|
||
}
|
||
|
||
|
||
/* 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, 0);
|
||
if (rc)
|
||
goto leave;
|
||
|
||
err = ksba_cms_add_signer (cms, cl->cert);
|
||
if (err)
|
||
{
|
||
log_error ("ksba_cms_add_signer failed: %s\n", gpg_strerror (err));
|
||
rc = 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, cl->hash_algo_oid);
|
||
if (err)
|
||
{
|
||
log_debug ("ksba_cms_add_digest_algo failed: %s\n",
|
||
gpg_strerror (err));
|
||
rc = err;
|
||
goto leave;
|
||
}
|
||
}
|
||
|
||
|
||
/* Check whether one of the certificates is qualified. Note that we
|
||
already validated the certificate and thus the user data stored
|
||
flag must be available. */
|
||
if (!opt.no_chain_validation)
|
||
{
|
||
for (cl=signerlist; cl; cl = cl->next)
|
||
{
|
||
size_t buflen;
|
||
char buffer[1];
|
||
|
||
err = ksba_cert_get_user_data (cl->cert, "is_qualified",
|
||
&buffer, sizeof (buffer), &buflen);
|
||
if (err || !buflen)
|
||
{
|
||
log_error (_("checking for qualified certificate failed: %s\n"),
|
||
gpg_strerror (err));
|
||
rc = err;
|
||
goto leave;
|
||
}
|
||
if (*buffer)
|
||
err = gpgsm_qualified_consent (ctrl, cl->cert);
|
||
else
|
||
err = gpgsm_not_qualified_warning (ctrl, cl->cert);
|
||
if (err)
|
||
{
|
||
rc = 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_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);
|
||
audit_log_i (ctrl->audit, AUDIT_DATA_HASH_ALGO, algo);
|
||
}
|
||
|
||
audit_log (ctrl->audit, AUDIT_SETUP_READY);
|
||
|
||
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;
|
||
|
||
if (!hash_data (data_fd, data_md))
|
||
audit_log (ctrl->audit, AUDIT_GOT_DATA);
|
||
for (cl=signerlist,signer=0; cl; cl = cl->next, signer++)
|
||
{
|
||
digest = gcry_md_read (data_md, cl->hash_algo);
|
||
digest_len = gcry_md_get_algo_dlen (cl->hash_algo);
|
||
if ( !digest || !digest_len )
|
||
{
|
||
log_error ("problem getting the hash of the data\n");
|
||
rc = gpg_error (GPG_ERR_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",
|
||
gpg_strerror (err));
|
||
rc = err;
|
||
goto leave;
|
||
}
|
||
}
|
||
}
|
||
|
||
gnupg_get_isotime (signed_at);
|
||
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",
|
||
gpg_strerror (err));
|
||
rc = err;
|
||
goto leave;
|
||
}
|
||
}
|
||
|
||
/* We can add signed attributes only when build against libksba 1.4. */
|
||
#if KSBA_VERSION_NUMBER >= 0x010400 && 0 /* 1.4.0 */
|
||
{
|
||
strlist_t sl;
|
||
|
||
for (sl = opt.attributes; sl; sl = sl->next)
|
||
if ((err = add_signed_attribute (cms, sl->d)))
|
||
goto leave;
|
||
}
|
||
#else
|
||
if (opt.attributes)
|
||
log_info ("Note: option --attribute is ignored by this version\n");
|
||
#endif /*ksba >= 1.4.0 */
|
||
|
||
|
||
/* We need to write at least a minimal list of our capabilities to
|
||
try to convince some MUAs to use 3DES and not the crippled
|
||
RC2. Our list is:
|
||
|
||
aes128-CBC
|
||
des-EDE3-CBC
|
||
*/
|
||
err = ksba_cms_add_smime_capability (cms, "2.16.840.1.101.3.4.1.2", NULL, 0);
|
||
if (!err)
|
||
err = ksba_cms_add_smime_capability (cms, "1.2.840.113549.3.7", NULL, 0);
|
||
if (err)
|
||
{
|
||
log_error ("ksba_cms_add_smime_capability failed: %s\n",
|
||
gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
|
||
|
||
/* Main building loop. */
|
||
do
|
||
{
|
||
err = ksba_cms_build (cms, &stopreason);
|
||
if (err)
|
||
{
|
||
log_debug ("ksba_cms_build failed: %s\n", gpg_strerror (err));
|
||
rc = err;
|
||
goto leave;
|
||
}
|
||
|
||
if (stopreason == KSBA_SR_BEGIN_DATA)
|
||
{
|
||
/* Hash the data and store the message digest. */
|
||
unsigned char *digest;
|
||
size_t digest_len;
|
||
|
||
log_assert (!detached);
|
||
|
||
rc = hash_and_copy_data (data_fd, data_md, writer);
|
||
if (rc)
|
||
goto leave;
|
||
audit_log (ctrl->audit, AUDIT_GOT_DATA);
|
||
for (cl=signerlist,signer=0; cl; cl = cl->next, signer++)
|
||
{
|
||
digest = gcry_md_read (data_md, cl->hash_algo);
|
||
digest_len = gcry_md_get_algo_dlen (cl->hash_algo);
|
||
if ( !digest || !digest_len )
|
||
{
|
||
log_error ("problem getting the hash of the data\n");
|
||
rc = gpg_error (GPG_ERR_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",
|
||
gpg_strerror (err));
|
||
rc = err;
|
||
goto leave;
|
||
}
|
||
}
|
||
}
|
||
else if (stopreason == KSBA_SR_NEED_SIG)
|
||
{
|
||
/* Compute the signature for all signers. */
|
||
gcry_md_hd_t md;
|
||
|
||
rc = gcry_md_open (&md, 0, 0);
|
||
if (rc)
|
||
{
|
||
log_error ("md_open failed: %s\n", gpg_strerror (rc));
|
||
goto leave;
|
||
}
|
||
if (DBG_HASHING)
|
||
gcry_md_debug (md, "sign.attr");
|
||
ksba_cms_set_hash_function (cms, HASH_FNC, md);
|
||
for (cl=signerlist,signer=0; cl; cl = cl->next, signer++)
|
||
{
|
||
unsigned char *sigval = NULL;
|
||
char *buf, *fpr;
|
||
|
||
audit_log_i (ctrl->audit, AUDIT_NEW_SIG, signer);
|
||
if (signer)
|
||
gcry_md_reset (md);
|
||
{
|
||
certlist_t cl_tmp;
|
||
|
||
for (cl_tmp=signerlist; cl_tmp; cl_tmp = cl_tmp->next)
|
||
{
|
||
gcry_md_enable (md, cl_tmp->hash_algo);
|
||
audit_log_i (ctrl->audit, AUDIT_ATTR_HASH_ALGO,
|
||
cl_tmp->hash_algo);
|
||
}
|
||
}
|
||
|
||
rc = ksba_cms_hash_signed_attrs (cms, signer);
|
||
if (rc)
|
||
{
|
||
log_debug ("hashing signed attrs failed: %s\n",
|
||
gpg_strerror (rc));
|
||
gcry_md_close (md);
|
||
goto leave;
|
||
}
|
||
|
||
rc = gpgsm_create_cms_signature (ctrl, cl->cert,
|
||
md, cl->hash_algo, &sigval);
|
||
if (rc)
|
||
{
|
||
audit_log_cert (ctrl->audit, AUDIT_SIGNED_BY, cl->cert, rc);
|
||
gcry_md_close (md);
|
||
goto leave;
|
||
}
|
||
|
||
err = ksba_cms_set_sig_val (cms, signer, sigval);
|
||
xfree (sigval);
|
||
if (err)
|
||
{
|
||
audit_log_cert (ctrl->audit, AUDIT_SIGNED_BY, cl->cert, err);
|
||
log_error ("failed to store the signature: %s\n",
|
||
gpg_strerror (err));
|
||
rc = 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 = 0;
|
||
if (opt.verbose)
|
||
{
|
||
char *pkalgostr = gpgsm_pubkey_algo_string (cl->cert, NULL);
|
||
log_info (_("%s/%s signature using %s key %s\n"),
|
||
pubkey_algo_to_string (cl->pk_algo),
|
||
gcry_md_algo_name (cl->hash_algo),
|
||
pkalgostr, fpr);
|
||
xfree (pkalgostr);
|
||
}
|
||
buf = xtryasprintf ("%c %d %d 00 %s %s",
|
||
detached? 'D':'S',
|
||
cl->pk_algo,
|
||
cl->hash_algo,
|
||
signed_at,
|
||
fpr);
|
||
if (!buf)
|
||
rc = gpg_error_from_syserror ();
|
||
xfree (fpr);
|
||
if (rc)
|
||
{
|
||
gcry_md_close (md);
|
||
goto leave;
|
||
}
|
||
gpgsm_status (ctrl, STATUS_SIG_CREATED, buf);
|
||
xfree (buf);
|
||
audit_log_cert (ctrl->audit, AUDIT_SIGNED_BY, cl->cert, 0);
|
||
}
|
||
gcry_md_close (md);
|
||
}
|
||
}
|
||
while (stopreason != KSBA_SR_READY);
|
||
|
||
rc = gnupg_ksba_finish_writer (b64writer);
|
||
if (rc)
|
||
{
|
||
log_error ("write failed: %s\n", gpg_strerror (rc));
|
||
goto leave;
|
||
}
|
||
|
||
audit_log (ctrl->audit, AUDIT_SIGNING_DONE);
|
||
log_info ("signature created\n");
|
||
|
||
leave:
|
||
if (rc)
|
||
log_error ("error creating signature: %s <%s>\n",
|
||
gpg_strerror (rc), gpg_strsource (rc) );
|
||
if (release_signerlist)
|
||
gpgsm_release_certlist (signerlist);
|
||
ksba_cms_release (cms);
|
||
gnupg_ksba_destroy_writer (b64writer);
|
||
keydb_release (kh);
|
||
gcry_md_close (data_md);
|
||
return rc;
|
||
}
|