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This commit was manufactured by cvs2svn to create branch
'GNUPG-1-9-BRANCH'.
This commit is contained in:
Repo Admin
parent
8d76177f10
commit
82a17c9fb3
563 changed files with 0 additions and 267875 deletions
510
sm/verify.c
510
sm/verify.c
|
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@ -1,510 +0,0 @@
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/* verify.c - Verify a messages signature
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* Copyright (C) 2001, 2002 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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/* fixme: Move this to jnlib */
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static char *
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strtimestamp (time_t atime)
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{
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char *buffer = xmalloc (15);
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if (atime < 0)
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strcpy (buffer, "????" "-??" "-??");
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else if (!atime)
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strcpy (buffer, "none");
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else
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{
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struct tm *tp;
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tp = gmtime( &atime );
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sprintf (buffer, "%04d-%02d-%02d",
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1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday);
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}
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return buffer;
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}
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/* Hash the data for a detached signature */
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static void
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hash_data (int fd, GCRY_MD_HD md)
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{
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FILE *fp;
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char buffer[4096];
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int nread;
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fp = fdopen ( dup (fd), "rb");
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if (!fp)
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{
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log_error ("fdopen(%d) failed: %s\n", fd, strerror (errno));
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return;
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}
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do
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{
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nread = fread (buffer, 1, DIM(buffer), fp);
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gcry_md_write (md, buffer, nread);
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}
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while (nread);
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if (ferror (fp))
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log_error ("read error on fd %d: %s\n", fd, strerror (errno));
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fclose (fp);
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}
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/* Perform a verify operation. To verify detached signatures, data_fd
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must be different than -1. With OUT_FP given and a non-detached
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signature, the signed material is written to that stream. */
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int
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gpgsm_verify (CTRL ctrl, int in_fd, int data_fd, FILE *out_fp)
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{
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int i, rc;
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Base64Context b64reader = NULL;
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Base64Context b64writer = NULL;
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KsbaError err;
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KsbaReader reader;
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KsbaWriter writer = NULL;
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KsbaCMS cms = NULL;
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KsbaStopReason stopreason;
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KsbaCert cert;
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KEYDB_HANDLE kh;
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GCRY_MD_HD 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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int is_detached;
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FILE *fp = NULL;
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char *p;
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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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fp = fdopen ( dup (in_fd), "rb");
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if (!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, 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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if (out_fp)
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{
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rc = gpgsm_create_writer (&b64writer, 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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}
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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_error ("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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data_md = gcry_md_open (0, 0);
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if (!data_md)
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{
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rc = map_gcry_err (gcry_errno());
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log_error ("md_open failed: %s\n", gcry_strerror (-1));
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goto leave;
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}
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if (DBG_HASHING)
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gcry_md_start_debug (data_md, "vrfy.data");
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is_detached = 0;
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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_error ("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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if (stopreason == KSBA_SR_NEED_HASH)
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{
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is_detached = 1;
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if (opt.verbose)
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log_info ("detached signature\n");
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}
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if (stopreason == KSBA_SR_NEED_HASH
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|| stopreason == KSBA_SR_BEGIN_DATA)
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{ /* We are now able to enable the hash algorithms */
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for (i=0; (algoid=ksba_cms_get_digest_algo_list (cms, i)); i++)
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{
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algo = gcry_md_map_name (algoid);
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if (!algo)
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log_error ("unknown hash algorithm `%s'\n",
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algoid? algoid:"?");
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else
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gcry_md_enable (data_md, algo);
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}
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if (is_detached)
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{
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if (data_fd == -1)
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log_info ("detached signature w/o data "
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"- assuming certs-only\n");
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else
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hash_data (data_fd, data_md);
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}
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else
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{
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ksba_cms_set_hash_function (cms, HASH_FNC, data_md);
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}
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}
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else if (stopreason == KSBA_SR_END_DATA)
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{ /* The data bas been hashed */
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}
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}
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while (stopreason != KSBA_SR_READY);
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if (b64writer)
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{
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rc = gpgsm_finish_writer (b64writer);
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if (rc)
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{
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log_error ("write failed: %s\n", gnupg_strerror (rc));
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goto leave;
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}
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}
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if (data_fd != -1 && !is_detached)
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{
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log_error ("data given for a non-detached signature\n");
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rc = GNUPG_Conflict;
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goto leave;
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}
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for (i=0; (cert=ksba_cms_get_cert (cms, i)); i++)
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{
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/* Fixme: it might be better to check the validity of the
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certificate first before entering it into the DB. This way
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we would avoid cluttering the DB with invalid
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certificates. */
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keydb_store_cert (cert, 0, NULL);
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ksba_cert_release (cert);
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}
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cert = NULL;
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err = 0;
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for (signer=0; ; signer++)
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{
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char *issuer = NULL;
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KsbaSexp sigval = NULL;
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time_t sigtime, keyexptime;
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KsbaSexp serial;
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char *msgdigest = NULL;
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size_t msgdigestlen;
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err = ksba_cms_get_issuer_serial (cms, signer, &issuer, &serial);
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if (!signer && err == KSBA_No_Data && data_fd == -1 && is_detached)
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{
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log_info ("certs-only message accepted\n");
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err = 0;
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break;
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}
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if (err)
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{
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if (signer && err == -1)
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err = 0;
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break;
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}
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if (DBG_X509)
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{
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log_debug ("signer %d - issuer: `%s'\n",
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signer, issuer? issuer:"[NONE]");
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log_debug ("signer %d - serial: ", signer);
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gpgsm_dump_serial (serial);
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log_printf ("\n");
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}
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err = ksba_cms_get_signing_time (cms, signer, &sigtime);
|
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if (err == KSBA_No_Data)
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||||
sigtime = 0;
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else if (err)
|
||||
{
|
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log_error ("error getting signing time: %s\n", ksba_strerror (err));
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sigtime = (time_t)-1;
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}
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||||
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||||
err = ksba_cms_get_message_digest (cms, signer,
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||||
&msgdigest, &msgdigestlen);
|
||||
if (!err)
|
||||
{
|
||||
algoid = ksba_cms_get_digest_algo (cms, signer);
|
||||
algo = gcry_md_map_name (algoid);
|
||||
if (DBG_X509)
|
||||
log_debug ("signer %d - digest algo: %d\n", signer, algo);
|
||||
if ( !gcry_md_info (data_md, GCRYCTL_IS_ALGO_ENABLED, &algo, NULL) )
|
||||
{
|
||||
log_error ("digest algo %d has not been enabled\n", algo);
|
||||
goto next_signer;
|
||||
}
|
||||
}
|
||||
else if (err == KSBA_No_Data)
|
||||
{
|
||||
assert (!msgdigest);
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||||
err = 0;
|
||||
algoid = NULL;
|
||||
algo = 0;
|
||||
}
|
||||
else /* real error */
|
||||
break;
|
||||
|
||||
sigval = ksba_cms_get_sig_val (cms, signer);
|
||||
if (!sigval)
|
||||
{
|
||||
log_error ("no signature value available\n");
|
||||
goto next_signer;
|
||||
}
|
||||
if (DBG_X509)
|
||||
log_debug ("signer %d - signature available", signer);
|
||||
|
||||
/* Find the certificate of the signer */
|
||||
keydb_search_reset (kh);
|
||||
rc = keydb_search_issuer_sn (kh, issuer, serial);
|
||||
if (rc)
|
||||
{
|
||||
if (rc == -1)
|
||||
{
|
||||
log_error ("certificate not found\n");
|
||||
rc = GNUPG_No_Public_Key;
|
||||
}
|
||||
else
|
||||
log_error ("failed to find the certificate: %s\n",
|
||||
gnupg_strerror(rc));
|
||||
gpgsm_status2 (ctrl, STATUS_ERROR, "verify.findkey",
|
||||
gnupg_error_token (rc), NULL);
|
||||
/* fixme: we might want to append the issuer and serial
|
||||
using our standard notation */
|
||||
goto next_signer;
|
||||
}
|
||||
|
||||
rc = keydb_get_cert (kh, &cert);
|
||||
if (rc)
|
||||
{
|
||||
log_error ("failed to get cert: %s\n", gnupg_strerror (rc));
|
||||
goto next_signer;
|
||||
}
|
||||
|
||||
log_info (_("Signature made "));
|
||||
if (sigtime)
|
||||
gpgsm_dump_time (sigtime);
|
||||
else
|
||||
log_printf (_("[date not given]"));
|
||||
log_printf (_(" using certificate ID %08lX\n"),
|
||||
gpgsm_get_short_fingerprint (cert));
|
||||
|
||||
|
||||
if (msgdigest)
|
||||
{ /* Signed attributes are available. */
|
||||
GCRY_MD_HD md;
|
||||
unsigned char *s;
|
||||
|
||||
/* check that the message digest in the signed attributes
|
||||
matches the one we calculated on the data */
|
||||
s = gcry_md_read (data_md, algo);
|
||||
if ( !s || !msgdigestlen
|
||||
|| gcry_md_get_algo_dlen (algo) != msgdigestlen
|
||||
|| !s || memcmp (s, msgdigest, msgdigestlen) )
|
||||
{
|
||||
char *fpr;
|
||||
|
||||
log_error ("invalid signature: message digest attribute "
|
||||
"does not match calculated one\n");
|
||||
fpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
|
||||
gpgsm_status (ctrl, STATUS_BADSIG, fpr);
|
||||
xfree (fpr);
|
||||
goto next_signer;
|
||||
}
|
||||
|
||||
md = gcry_md_open (algo, 0);
|
||||
if (!md)
|
||||
{
|
||||
log_error ("md_open failed: %s\n", gcry_strerror (-1));
|
||||
goto next_signer;
|
||||
}
|
||||
if (DBG_HASHING)
|
||||
gcry_md_start_debug (md, "vrfy.attr");
|
||||
|
||||
ksba_cms_set_hash_function (cms, HASH_FNC, md);
|
||||
rc = ksba_cms_hash_signed_attrs (cms, signer);
|
||||
if (rc)
|
||||
{
|
||||
log_error ("hashing signed attrs failed: %s\n",
|
||||
ksba_strerror (rc));
|
||||
gcry_md_close (md);
|
||||
goto next_signer;
|
||||
}
|
||||
rc = gpgsm_check_cms_signature (cert, sigval, md, algo);
|
||||
gcry_md_close (md);
|
||||
}
|
||||
else
|
||||
{
|
||||
rc = gpgsm_check_cms_signature (cert, sigval, data_md, algo);
|
||||
}
|
||||
|
||||
if (rc)
|
||||
{
|
||||
char *fpr;
|
||||
|
||||
log_error ("invalid signature: %s\n", gnupg_strerror (rc));
|
||||
fpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
|
||||
gpgsm_status (ctrl, STATUS_BADSIG, fpr);
|
||||
xfree (fpr);
|
||||
goto next_signer;
|
||||
}
|
||||
rc = gpgsm_cert_use_verify_p (cert); /*(this displays an info message)*/
|
||||
if (rc)
|
||||
{
|
||||
gpgsm_status2 (ctrl, STATUS_ERROR, "verify.keyusage",
|
||||
gnupg_error_token (rc), NULL);
|
||||
rc = 0;
|
||||
}
|
||||
|
||||
if (DBG_X509)
|
||||
log_debug ("signature okay - checking certs\n");
|
||||
rc = gpgsm_validate_chain (ctrl, cert, &keyexptime);
|
||||
if (rc == GNUPG_Certificate_Expired)
|
||||
{
|
||||
gpgsm_status (ctrl, STATUS_EXPKEYSIG, NULL);
|
||||
rc = 0;
|
||||
}
|
||||
else
|
||||
gpgsm_status (ctrl, STATUS_GOODSIG, NULL);
|
||||
|
||||
{
|
||||
char *buf, *fpr, *tstr;
|
||||
|
||||
fpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
|
||||
tstr = strtimestamp (sigtime);
|
||||
buf = xmalloc ( strlen(fpr) + strlen (tstr) + 120);
|
||||
sprintf (buf, "%s %s %lu %lu", fpr, tstr,
|
||||
(unsigned long)sigtime, (unsigned long)keyexptime );
|
||||
xfree (tstr);
|
||||
xfree (fpr);
|
||||
gpgsm_status (ctrl, STATUS_VALIDSIG, buf);
|
||||
xfree (buf);
|
||||
}
|
||||
|
||||
if (rc) /* of validate_chain */
|
||||
{
|
||||
log_error ("invalid certification chain: %s\n", gnupg_strerror (rc));
|
||||
if (rc == GNUPG_Bad_Certificate_Chain
|
||||
|| rc == GNUPG_Bad_Certificate
|
||||
|| rc == GNUPG_Bad_CA_Certificate
|
||||
|| rc == GNUPG_Certificate_Revoked)
|
||||
gpgsm_status (ctrl, STATUS_TRUST_NEVER, gnupg_error_token (rc));
|
||||
else
|
||||
gpgsm_status (ctrl, STATUS_TRUST_UNDEFINED, gnupg_error_token (rc));
|
||||
goto next_signer;
|
||||
}
|
||||
|
||||
for (i=0; (p = ksba_cert_get_subject (cert, i)); i++)
|
||||
{
|
||||
log_info (!i? _("Good signature from")
|
||||
: _(" aka"));
|
||||
log_printf (" \"");
|
||||
gpgsm_print_name (log_get_stream (), p);
|
||||
log_printf ("\"\n");
|
||||
ksba_free (p);
|
||||
}
|
||||
|
||||
gpgsm_status (ctrl, STATUS_TRUST_FULLY, NULL);
|
||||
|
||||
|
||||
next_signer:
|
||||
rc = 0;
|
||||
xfree (issuer);
|
||||
xfree (serial);
|
||||
xfree (sigval);
|
||||
xfree (msgdigest);
|
||||
ksba_cert_release (cert);
|
||||
cert = NULL;
|
||||
}
|
||||
rc = 0;
|
||||
if (err)
|
||||
{
|
||||
log_error ("ksba error: %s\n", ksba_strerror (err));
|
||||
rc = map_ksba_err (rc);
|
||||
}
|
||||
|
||||
|
||||
|
||||
leave:
|
||||
ksba_cms_release (cms);
|
||||
gpgsm_destroy_reader (b64reader);
|
||||
gpgsm_destroy_writer (b64writer);
|
||||
keydb_release (kh);
|
||||
gcry_md_close (data_md);
|
||||
if (fp)
|
||||
fclose (fp);
|
||||
|
||||
if (rc)
|
||||
gpgsm_status2 (ctrl, STATUS_ERROR, "verify.leave",
|
||||
gnupg_error_token (rc), NULL);
|
||||
return rc;
|
||||
}
|
||||
|
||||
Loading…
Add table
Add a link
Reference in a new issue