mirror of
git://git.gnupg.org/gnupg.git
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224 lines
5.8 KiB
C
224 lines
5.8 KiB
C
/* decrypt.c - Decrypt a message
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* Copyright (C) 2001 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 <gcrypt.h>
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#include <ksba.h>
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#include "gpgsm.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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print_integer (unsigned char *p)
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{
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unsigned long len;
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if (!p)
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log_printf ("none");
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else
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{
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len = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
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for (p+=4; len; len--, p++)
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log_printf ("%02X", *p);
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}
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}
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/* Perform a decrypt operation. */
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int
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gpgsm_decrypt (CTRL ctrl, int in_fd, FILE *out_fp)
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{
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int rc;
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KsbaError err;
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Base64Context b64reader = NULL;
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Base64Context b64writer = NULL;
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KsbaReader reader;
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KsbaWriter writer;
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KsbaCMS cms = NULL;
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KsbaStopReason stopreason;
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KEYDB_HANDLE kh;
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int recp;
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FILE *in_fp = NULL;
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kh = keydb_new (0);
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if (!kh)
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{
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log_error (_("failed to allocated keyDB handle\n"));
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rc = GNUPG_General_Error;
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goto leave;
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}
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in_fp = fdopen ( dup (in_fd), "rb");
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if (!in_fp)
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{
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log_error ("fdopen() failed: %s\n", strerror (errno));
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rc = seterr (IO_Error);
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goto leave;
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}
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rc = gpgsm_create_reader (&b64reader, ctrl, in_fp, &reader);
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if (rc)
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{
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log_error ("can't create reader: %s\n", gnupg_strerror (rc));
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goto leave;
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}
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rc = gpgsm_create_writer (&b64reader, ctrl, 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", gnupg_strerror (rc));
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goto leave;
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}
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cms = ksba_cms_new ();
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if (!cms)
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{
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rc = seterr (Out_Of_Core);
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goto leave;
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}
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err = ksba_cms_set_reader_writer (cms, reader, 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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ksba_strerror (err));
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rc = map_ksba_err (err);
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goto leave;
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}
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/* parser loop */
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do
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{
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err = ksba_cms_parse (cms, &stopreason);
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if (err)
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{
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log_debug ("ksba_cms_parse failed: %s\n", ksba_strerror (err));
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rc = map_ksba_err (err);
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goto leave;
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}
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log_debug ("ksba_cms_parse - stop reason %d\n", stopreason);
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if (stopreason == KSBA_SR_BEGIN_DATA
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|| stopreason == KSBA_SR_DETACHED_DATA)
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{
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for (recp=0; recp < 1; recp++)
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{
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char *issuer;
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unsigned char *serial;
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char *enc_val;
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char *hexkeygrip = NULL;
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err = ksba_cms_get_issuer_serial (cms, recp, &issuer, &serial);
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if (err)
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log_error ("recp %d - error getting info: %s\n",
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recp, ksba_strerror (err));
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else
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{
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KsbaCert cert = NULL;
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log_debug ("recp %d - issuer: `%s'\n",
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recp, issuer? issuer:"[NONE]");
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log_debug ("recp %d - serial: ", recp);
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print_integer (serial);
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log_printf ("\n");
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keydb_search_reset (kh);
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rc = keydb_search_issuer_sn (kh, issuer, serial);
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if (rc)
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{
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log_debug ("failed to find the certificate: %s\n",
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gnupg_strerror(rc));
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goto oops;
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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: %s\n", gnupg_strerror (rc));
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goto oops;
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}
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hexkeygrip = gpgsm_get_keygrip_hexstring (cert);
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oops:
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xfree (issuer);
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xfree (serial);
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ksba_cert_release (cert);
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}
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enc_val = ksba_cms_get_enc_val (cms, recp);
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if (!enc_val)
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log_error ("recp %d - error getting encrypted session key\n",
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recp);
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else
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{
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char *seskey;
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size_t seskeylen;
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log_debug ("recp %d - enc-val: `%s'\n",
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recp, enc_val);
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rc = gpgsm_agent_pkdecrypt (hexkeygrip,
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enc_val, strlen (enc_val),
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&seskey, &seskeylen);
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if (rc)
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log_debug ("problem: %s\n", gnupg_strerror (rc));
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else
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{
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unsigned char *p;
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log_debug ("plaintext=");
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for (p=seskey; seskeylen; seskeylen--, p++)
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log_printf (" %02X", *p);
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log_printf ("\n");
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}
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xfree (enc_val);
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}
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}
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}
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}
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while (stopreason != KSBA_SR_READY);
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leave:
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ksba_cms_release (cms);
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gpgsm_destroy_reader (b64reader);
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gpgsm_destroy_writer (b64writer);
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keydb_release (kh);
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if (in_fp)
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fclose (in_fp);
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return rc;
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}
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