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![Werner Koch](/assets/img/avatar_default.png)
* sm/decrypt.c (pwri_decrypt): Add arg ctrl. Ask for passphrase. * sm/export.c (export_p12): Mark string as translatable. * sm/import.c (parse_p12): Ditto. -- This is finishes the support for PWRI. The N_() marks are added so that we don't rely of the side-effect of having the same strings in protect-tool.c Signed-off-by: Werner Koch <wk@gnupg.org>
774 lines
20 KiB
C
774 lines
20 KiB
C
/* export.c - Export certificates and private keys.
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* Copyright (C) 2002, 2003, 2004, 2007, 2009,
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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 <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/exechelp.h"
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#include "../common/i18n.h"
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#include "../common/sysutils.h"
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#include "minip12.h"
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/* A table to store a fingerprint as used in a duplicates table. We
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don't need to hash here because a fingerprint is already a perfect
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hash value. This we use the most significant bits to index the
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table and then use a linked list for the overflow. Possible
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enhancement for very large number of certificates: Add a second
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level table and then resort to a linked list. */
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struct duptable_s
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{
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struct duptable_s *next;
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/* Note that we only need to store 19 bytes because the first byte
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is implicitly given by the table index (we require at least 8
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bits). */
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unsigned char fpr[19];
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};
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typedef struct duptable_s *duptable_t;
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#define DUPTABLE_BITS 12
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#define DUPTABLE_SIZE (1 << DUPTABLE_BITS)
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static void print_short_info (ksba_cert_t cert, estream_t stream);
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static gpg_error_t export_p12 (ctrl_t ctrl,
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const unsigned char *certimg, size_t certimglen,
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const char *prompt, const char *keygrip,
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int rawmode,
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void **r_result, size_t *r_resultlen);
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/* Create a table used to indetify duplicated certificates. */
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static duptable_t *
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create_duptable (void)
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{
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return xtrycalloc (DUPTABLE_SIZE, sizeof (duptable_t));
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}
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static void
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destroy_duptable (duptable_t *table)
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{
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int idx;
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duptable_t t, t2;
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if (table)
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{
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for (idx=0; idx < DUPTABLE_SIZE; idx++)
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for (t = table[idx]; t; t = t2)
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{
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t2 = t->next;
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xfree (t);
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}
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xfree (table);
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}
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}
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/* Insert the 20 byte fingerprint FPR into TABLE. Sets EXITS to true
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if the fingerprint already exists in the table. */
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static gpg_error_t
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insert_duptable (duptable_t *table, unsigned char *fpr, int *exists)
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{
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size_t idx;
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duptable_t t;
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*exists = 0;
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idx = fpr[0];
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#if DUPTABLE_BITS > 16 || DUPTABLE_BITS < 8
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#error cannot handle a table larger than 16 bits or smaller than 8 bits
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#elif DUPTABLE_BITS > 8
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idx <<= (DUPTABLE_BITS - 8);
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idx |= (fpr[1] & ~(~0U << 4));
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#endif
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for (t = table[idx]; t; t = t->next)
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if (!memcmp (t->fpr, fpr+1, 19))
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break;
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if (t)
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{
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*exists = 1;
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return 0;
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}
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/* Insert that fingerprint. */
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t = xtrymalloc (sizeof *t);
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if (!t)
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return gpg_error_from_syserror ();
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memcpy (t->fpr, fpr+1, 19);
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t->next = table[idx];
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table[idx] = t;
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return 0;
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}
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/* Export all certificates or just those given in NAMES. The output
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is written to STREAM. */
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void
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gpgsm_export (ctrl_t ctrl, strlist_t names, estream_t stream)
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{
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KEYDB_HANDLE hd = NULL;
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KEYDB_SEARCH_DESC *desc = NULL;
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int ndesc;
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gnupg_ksba_io_t b64writer = NULL;
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ksba_writer_t writer;
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strlist_t sl;
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ksba_cert_t cert = NULL;
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int rc=0;
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int count = 0;
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int i;
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duptable_t *dtable;
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dtable = create_duptable ();
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if (!dtable)
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{
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log_error ("creating duplicates table failed: %s\n", strerror (errno));
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goto leave;
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}
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hd = keydb_new (ctrl);
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if (!hd)
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{
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log_error ("keydb_new failed\n");
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goto leave;
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}
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if (!names)
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ndesc = 1;
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else
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{
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for (sl=names, ndesc=0; sl; sl = sl->next, ndesc++)
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;
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}
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desc = xtrycalloc (ndesc, sizeof *desc);
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if (!ndesc)
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{
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log_error ("allocating memory for export failed: %s\n",
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gpg_strerror (out_of_core ()));
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goto leave;
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}
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if (!names)
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desc[0].mode = KEYDB_SEARCH_MODE_FIRST;
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else
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{
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for (ndesc=0, sl=names; sl; sl = sl->next)
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{
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rc = classify_user_id (sl->d, desc+ndesc, 0);
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if (rc)
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{
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log_error ("key '%s' not found: %s\n",
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sl->d, gpg_strerror (rc));
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rc = 0;
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}
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else
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ndesc++;
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}
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}
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/* If all specifications are done by fingerprint or keygrip, we
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switch to ephemeral mode so that _all_ currently available and
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matching certificates are exported. */
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if (names && ndesc)
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{
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for (i=0; (i < ndesc
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&& (desc[i].mode == KEYDB_SEARCH_MODE_FPR
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|| desc[i].mode == KEYDB_SEARCH_MODE_KEYGRIP)); i++)
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;
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if (i == ndesc)
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keydb_set_ephemeral (hd, 1);
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}
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while (!(rc = keydb_search (ctrl, hd, desc, ndesc)))
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{
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unsigned char fpr[20];
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int exists;
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if (!names)
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desc[0].mode = KEYDB_SEARCH_MODE_NEXT;
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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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goto leave;
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}
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gpgsm_get_fingerprint (cert, 0, fpr, NULL);
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rc = insert_duptable (dtable, fpr, &exists);
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if (rc)
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{
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log_error ("inserting into duplicates table failed: %s\n",
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gpg_strerror (rc));
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goto leave;
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}
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if (!exists && count && !ctrl->create_pem)
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{
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log_info ("exporting more than one certificate "
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"is not possible in binary mode\n");
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log_info ("ignoring other certificates\n");
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break;
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}
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if (!exists)
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{
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const unsigned char *image;
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size_t imagelen;
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image = ksba_cert_get_image (cert, &imagelen);
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if (!image)
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{
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log_error ("ksba_cert_get_image failed\n");
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goto leave;
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}
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if (ctrl->create_pem)
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{
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if (count)
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es_putc ('\n', stream);
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print_short_info (cert, stream);
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es_putc ('\n', stream);
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}
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count++;
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if (!b64writer)
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{
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ctrl->pem_name = "CERTIFICATE";
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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, stream, &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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}
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rc = ksba_writer_write (writer, image, imagelen);
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if (rc)
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{
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log_error ("write error: %s\n", gpg_strerror (rc));
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goto leave;
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}
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if (ctrl->create_pem)
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{
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/* We want one certificate per PEM block */
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rc = gnupg_ksba_finish_writer (b64writer);
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if (rc)
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{
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log_error ("write failed: %s\n", gpg_strerror (rc));
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goto leave;
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}
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gnupg_ksba_destroy_writer (b64writer);
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b64writer = NULL;
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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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if (rc && gpg_err_code (rc) != GPG_ERR_NOT_FOUND)
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log_error ("keydb_search failed: %s\n", gpg_strerror (rc));
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else if (b64writer)
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{
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rc = gnupg_ksba_finish_writer (b64writer);
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if (rc)
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{
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log_error ("write failed: %s\n", gpg_strerror (rc));
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goto leave;
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}
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}
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leave:
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gnupg_ksba_destroy_writer (b64writer);
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ksba_cert_release (cert);
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xfree (desc);
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keydb_release (hd);
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destroy_duptable (dtable);
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}
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/* Export a certificate and its private key. RAWMODE controls the
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actual output:
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0 - Private key and certifciate in PKCS#12 format
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1 - Only unencrypted private key in PKCS#8 format
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2 - Only unencrypted private key in PKCS#1 format
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*/
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void
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gpgsm_p12_export (ctrl_t ctrl, const char *name, estream_t stream, int rawmode)
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{
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gpg_error_t err = 0;
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KEYDB_HANDLE hd;
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KEYDB_SEARCH_DESC *desc = NULL;
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gnupg_ksba_io_t b64writer = NULL;
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ksba_writer_t writer;
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ksba_cert_t cert = NULL;
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const unsigned char *image;
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size_t imagelen;
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char *keygrip = NULL;
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char *prompt;
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void *data;
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size_t datalen;
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hd = keydb_new (ctrl);
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if (!hd)
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{
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log_error ("keydb_new failed\n");
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goto leave;
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}
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desc = xtrycalloc (1, sizeof *desc);
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if (!desc)
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{
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log_error ("allocating memory for export failed: %s\n",
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gpg_strerror (out_of_core ()));
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goto leave;
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}
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err = classify_user_id (name, desc, 0);
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if (err)
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{
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log_error ("key '%s' not found: %s\n",
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name, gpg_strerror (err));
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goto leave;
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}
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/* Lookup the certificate and make sure that it is unique. */
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err = keydb_search (ctrl, hd, desc, 1);
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if (!err)
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{
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err = keydb_get_cert (hd, &cert);
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if (err)
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{
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log_error ("keydb_get_cert failed: %s\n", gpg_strerror (err));
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goto leave;
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}
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next_ambiguous:
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err = keydb_search (ctrl, hd, desc, 1);
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if (!err)
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{
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ksba_cert_t cert2 = NULL;
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if (!keydb_get_cert (hd, &cert2))
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{
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if (gpgsm_certs_identical_p (cert, cert2))
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{
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ksba_cert_release (cert2);
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goto next_ambiguous;
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}
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ksba_cert_release (cert2);
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}
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err = gpg_error (GPG_ERR_AMBIGUOUS_NAME);
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}
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else if (gpg_err_code (err) == GPG_ERR_NOT_FOUND)
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err = 0;
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if (err)
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{
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log_error ("key '%s' not found: %s\n",
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name, gpg_strerror (err));
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goto leave;
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}
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}
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keygrip = gpgsm_get_keygrip_hexstring (cert);
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if (!keygrip || gpgsm_agent_havekey (ctrl, keygrip))
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{
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/* Note, that the !keygrip case indicates a bad certificate. */
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err = gpg_error (GPG_ERR_NO_SECKEY);
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log_error ("can't export key '%s': %s\n", name, gpg_strerror (err));
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goto leave;
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}
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image = ksba_cert_get_image (cert, &imagelen);
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if (!image)
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{
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log_error ("ksba_cert_get_image failed\n");
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goto leave;
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}
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if (ctrl->create_pem)
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{
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print_short_info (cert, stream);
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es_putc ('\n', stream);
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}
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if (opt.p12_charset && ctrl->create_pem && !rawmode)
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{
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es_fprintf (stream, "The passphrase is %s encoded.\n\n",
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opt.p12_charset);
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}
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if (rawmode == 0)
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ctrl->pem_name = "PKCS12";
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else if (gpgsm_get_key_algo_info (cert, NULL) == GCRY_PK_ECC)
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ctrl->pem_name = "EC PRIVATE KEY";
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else if (rawmode == 1)
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ctrl->pem_name = "PRIVATE KEY";
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else
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ctrl->pem_name = "RSA PRIVATE KEY";
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err = 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, stream, &writer);
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if (err)
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{
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log_error ("can't create writer: %s\n", gpg_strerror (err));
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goto leave;
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}
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prompt = gpgsm_format_keydesc (cert);
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err = export_p12 (ctrl, image, imagelen, prompt, keygrip, rawmode,
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&data, &datalen);
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xfree (prompt);
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if (err)
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goto leave;
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err = ksba_writer_write (writer, data, datalen);
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xfree (data);
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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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goto leave;
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}
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if (ctrl->create_pem)
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{
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/* We want one certificate per PEM block */
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err = gnupg_ksba_finish_writer (b64writer);
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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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goto leave;
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}
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gnupg_ksba_destroy_writer (b64writer);
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b64writer = NULL;
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}
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ksba_cert_release (cert);
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cert = NULL;
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leave:
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gnupg_ksba_destroy_writer (b64writer);
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ksba_cert_release (cert);
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xfree (keygrip);
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xfree (desc);
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keydb_release (hd);
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}
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/* Print some info about the certifciate CERT to FP or STREAM */
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static void
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print_short_info (ksba_cert_t cert, estream_t stream)
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{
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char *p;
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ksba_sexp_t sexp;
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int idx;
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for (idx=0; (p = ksba_cert_get_issuer (cert, idx)); idx++)
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{
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es_fputs ((!idx
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? "Issuer ...: "
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: "\n aka ...: "), stream);
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gpgsm_es_print_name (stream, p);
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xfree (p);
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}
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es_putc ('\n', stream);
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es_fputs ("Serial ...: ", stream);
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sexp = ksba_cert_get_serial (cert);
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if (sexp)
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{
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int len;
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const unsigned char *s = sexp;
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if (*s == '(')
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{
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s++;
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for (len=0; *s && *s != ':' && digitp (s); s++)
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len = len*10 + atoi_1 (s);
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if (*s == ':')
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es_write_hexstring (stream, s+1, len, 0, NULL);
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}
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xfree (sexp);
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}
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es_putc ('\n', stream);
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for (idx=0; (p = ksba_cert_get_subject (cert, idx)); idx++)
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{
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es_fputs ((!idx
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? "Subject ..: "
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: "\n aka ..: "), stream);
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gpgsm_es_print_name (stream, p);
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xfree (p);
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}
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es_putc ('\n', stream);
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|
||
p = gpgsm_get_keygrip_hexstring (cert);
|
||
if (p)
|
||
{
|
||
es_fprintf (stream, "Keygrip ..: %s\n", p);
|
||
xfree (p);
|
||
}
|
||
}
|
||
|
||
|
||
|
||
/* Parse a private key S-expression and return a malloced array with
|
||
the RSA parameters in pkcs#12 order. The caller needs to
|
||
deep-release this array. */
|
||
static gcry_mpi_t *
|
||
sexp_to_kparms (gcry_sexp_t sexp)
|
||
{
|
||
gcry_sexp_t list, l2;
|
||
const char *name;
|
||
const char *s;
|
||
size_t n;
|
||
int idx;
|
||
gcry_mpi_t *array;
|
||
|
||
list = gcry_sexp_find_token (sexp, "private-key", 0 );
|
||
if(!list)
|
||
return NULL;
|
||
l2 = gcry_sexp_cadr (list);
|
||
gcry_sexp_release (list);
|
||
list = l2;
|
||
name = gcry_sexp_nth_data (list, 0, &n);
|
||
if (name && n == 3 && !memcmp (name, "rsa", 3))
|
||
{
|
||
/* Parameter names used with RSA in the pkcs#12 order. */
|
||
const char *elems = "nedqp--u";
|
||
|
||
array = xtrycalloc (strlen(elems) + 1, sizeof *array);
|
||
if (!array)
|
||
{
|
||
gcry_sexp_release (list);
|
||
return NULL;
|
||
}
|
||
for (idx=0, s=elems; *s; s++, idx++ )
|
||
{
|
||
if (*s == '-')
|
||
continue; /* Computed below */
|
||
l2 = gcry_sexp_find_token (list, s, 1);
|
||
if (l2)
|
||
{
|
||
array[idx] = gcry_sexp_nth_mpi (l2, 1, GCRYMPI_FMT_USG);
|
||
gcry_sexp_release (l2);
|
||
}
|
||
if (!array[idx]) /* Required parameter not found or invalid. */
|
||
{
|
||
for (idx=0; array[idx]; idx++)
|
||
gcry_mpi_release (array[idx]);
|
||
xfree (array);
|
||
gcry_sexp_release (list);
|
||
return NULL;
|
||
}
|
||
}
|
||
|
||
array[5] = gcry_mpi_snew (0); /* compute d mod (q-1) */
|
||
gcry_mpi_sub_ui (array[5], array[3], 1);
|
||
gcry_mpi_mod (array[5], array[2], array[5]);
|
||
|
||
array[6] = gcry_mpi_snew (0); /* compute d mod (p-1) */
|
||
gcry_mpi_sub_ui (array[6], array[4], 1);
|
||
gcry_mpi_mod (array[6], array[2], array[6]);
|
||
}
|
||
else if (name && n == 3 && !memcmp (name, "ecc", 3))
|
||
{
|
||
array = xtrycalloc (3 + 1, sizeof *array);
|
||
if (!array)
|
||
{
|
||
gcry_sexp_release (list);
|
||
return NULL;
|
||
}
|
||
|
||
if (gcry_sexp_extract_param (list, NULL, "/'curve'qd",
|
||
array+0, array+1, array+2, NULL))
|
||
{
|
||
xfree (array);
|
||
array = NULL; /* Error. */
|
||
}
|
||
}
|
||
else
|
||
{
|
||
array = NULL;
|
||
}
|
||
|
||
gcry_sexp_release (list);
|
||
return array;
|
||
}
|
||
|
||
|
||
static gpg_error_t
|
||
export_p12 (ctrl_t ctrl, const unsigned char *certimg, size_t certimglen,
|
||
const char *prompt, const char *keygrip, int rawmode,
|
||
void **r_result, size_t *r_resultlen)
|
||
{
|
||
gpg_error_t err = 0;
|
||
void *kek = NULL;
|
||
size_t keklen;
|
||
unsigned char *wrappedkey = NULL;
|
||
size_t wrappedkeylen;
|
||
gcry_cipher_hd_t cipherhd = NULL;
|
||
gcry_sexp_t s_skey = NULL;
|
||
gcry_mpi_t *kparms = NULL;
|
||
unsigned char *key = NULL;
|
||
size_t keylen;
|
||
char *passphrase = NULL;
|
||
unsigned char *result = NULL;
|
||
size_t resultlen;
|
||
int i;
|
||
|
||
*r_result = NULL;
|
||
|
||
/* Get the current KEK. */
|
||
err = gpgsm_agent_keywrap_key (ctrl, 1, &kek, &keklen);
|
||
if (err)
|
||
{
|
||
log_error ("error getting the KEK: %s\n", gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
|
||
/* Receive the wrapped key from the agent. */
|
||
err = gpgsm_agent_export_key (ctrl, keygrip, prompt,
|
||
&wrappedkey, &wrappedkeylen);
|
||
if (err)
|
||
goto leave;
|
||
|
||
|
||
/* Unwrap the key. */
|
||
err = gcry_cipher_open (&cipherhd, GCRY_CIPHER_AES128,
|
||
GCRY_CIPHER_MODE_AESWRAP, 0);
|
||
if (err)
|
||
goto leave;
|
||
err = gcry_cipher_setkey (cipherhd, kek, keklen);
|
||
if (err)
|
||
goto leave;
|
||
xfree (kek);
|
||
kek = NULL;
|
||
|
||
if (wrappedkeylen < 24)
|
||
{
|
||
err = gpg_error (GPG_ERR_INV_LENGTH);
|
||
goto leave;
|
||
}
|
||
keylen = wrappedkeylen - 8;
|
||
key = xtrymalloc_secure (keylen);
|
||
if (!key)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
err = gcry_cipher_decrypt (cipherhd, key, keylen, wrappedkey, wrappedkeylen);
|
||
if (err)
|
||
goto leave;
|
||
xfree (wrappedkey);
|
||
wrappedkey = NULL;
|
||
gcry_cipher_close (cipherhd);
|
||
cipherhd = NULL;
|
||
|
||
|
||
/* Convert to a gcrypt S-expression. */
|
||
err = gcry_sexp_create (&s_skey, key, keylen, 0, xfree_fnc);
|
||
if (err)
|
||
goto leave;
|
||
key = NULL; /* Key is now owned by S_KEY. */
|
||
|
||
/* Get the parameters from the S-expression. */
|
||
kparms = sexp_to_kparms (s_skey);
|
||
gcry_sexp_release (s_skey);
|
||
s_skey = NULL;
|
||
if (!kparms)
|
||
{
|
||
log_error ("error converting key parameters\n");
|
||
err = GPG_ERR_BAD_SECKEY;
|
||
goto leave;
|
||
}
|
||
|
||
if (rawmode)
|
||
{
|
||
/* Export in raw mode, that is only the pkcs#1/#8 private key. */
|
||
result = p12_raw_build (kparms, rawmode, &resultlen);
|
||
if (!result)
|
||
err = gpg_error (GPG_ERR_GENERAL);
|
||
}
|
||
else
|
||
{
|
||
err = gpgsm_agent_ask_passphrase
|
||
(ctrl,
|
||
i18n_utf8 (N_("Please enter the passphrase to protect the "
|
||
"new PKCS#12 object.")),
|
||
1, &passphrase);
|
||
if (err)
|
||
goto leave;
|
||
|
||
result = p12_build (kparms, certimg, certimglen, passphrase,
|
||
opt.p12_charset, &resultlen);
|
||
xfree (passphrase);
|
||
passphrase = NULL;
|
||
if (!result)
|
||
err = gpg_error (GPG_ERR_GENERAL);
|
||
}
|
||
|
||
leave:
|
||
xfree (key);
|
||
gcry_sexp_release (s_skey);
|
||
if (kparms)
|
||
{
|
||
for (i=0; kparms[i]; i++)
|
||
gcry_mpi_release (kparms[i]);
|
||
xfree (kparms);
|
||
}
|
||
gcry_cipher_close (cipherhd);
|
||
xfree (wrappedkey);
|
||
xfree (kek);
|
||
|
||
if (gpg_err_code (err) == GPG_ERR_BAD_PASSPHRASE)
|
||
{
|
||
/* 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");
|
||
}
|
||
|
||
if (err)
|
||
{
|
||
xfree (result);
|
||
}
|
||
else
|
||
{
|
||
*r_result = result;
|
||
*r_resultlen = resultlen;
|
||
}
|
||
return err;
|
||
}
|