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b008274afd
We better do this once and for all instead of cluttering all future commits with diffs of trailing white spaces. In the majority of cases blank or single lines are affected and thus this change won't disturb a git blame too much. For future commits the pre-commit scripts checks that this won't happen again.
274 lines
6.3 KiB
C
274 lines
6.3 KiB
C
/* decrypt.c - decrypt and verify data
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* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
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* 2007, 2009 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 <http://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 <assert.h>
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#include "gpg.h"
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#include "options.h"
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#include "packet.h"
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#include "status.h"
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#include "iobuf.h"
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#include "keydb.h"
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#include "util.h"
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#include "main.h"
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#include "status.h"
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#include "i18n.h"
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/* Assume that the input is an encrypted message and decrypt
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* (and if signed, verify the signature on) it.
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* This command differs from the default operation, as it never
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* writes to the filename which is included in the file and it
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* rejects files which don't begin with an encrypted message.
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*/
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int
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decrypt_message (ctrl_t ctrl, const char *filename)
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{
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IOBUF fp;
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armor_filter_context_t *afx = NULL;
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progress_filter_context_t *pfx;
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int rc;
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int no_out = 0;
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pfx = new_progress_context ();
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/* Open the message file. */
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fp = iobuf_open (filename);
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if (fp && is_secured_file (iobuf_get_fd (fp)))
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{
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iobuf_close (fp);
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fp = NULL;
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gpg_err_set_errno (EPERM);
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}
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if ( !fp )
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{
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rc = gpg_error_from_syserror ();
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log_error (_("can't open `%s': %s\n"), print_fname_stdin(filename),
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gpg_strerror (rc));
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release_progress_context (pfx);
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return rc;
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}
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handle_progress (pfx, fp, filename);
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if ( !opt.no_armor )
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{
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if ( use_armor_filter( fp ) )
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{
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afx = new_armor_context ();
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push_armor_filter ( afx, fp );
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}
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}
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if (!opt.outfile)
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{
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no_out = 1;
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opt.outfile = "-";
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}
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rc = proc_encryption_packets (ctrl, NULL, fp );
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if (no_out)
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opt.outfile = NULL;
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iobuf_close (fp);
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release_armor_context (afx);
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release_progress_context (pfx);
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return rc;
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}
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/* Same as decrypt_message but takes a file descriptor for input and
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output. */
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gpg_error_t
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decrypt_message_fd (ctrl_t ctrl, int input_fd, int output_fd)
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{
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gpg_error_t err;
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IOBUF fp;
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armor_filter_context_t *afx = NULL;
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progress_filter_context_t *pfx;
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if (opt.outfp)
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return gpg_error (GPG_ERR_BUG);
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pfx = new_progress_context ();
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/* Open the message file. */
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fp = iobuf_open_fd_or_name (input_fd, NULL, "rb");
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if (fp && is_secured_file (iobuf_get_fd (fp)))
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{
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iobuf_close (fp);
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fp = NULL;
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gpg_err_set_errno (EPERM);
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}
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if (!fp)
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{
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char xname[64];
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err = gpg_error_from_syserror ();
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snprintf (xname, sizeof xname, "[fd %d]", input_fd);
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log_error (_("can't open `%s': %s\n"), xname, gpg_strerror (err));
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release_progress_context (pfx);
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return err;
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}
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#ifdef HAVE_W32CE_SYSTEM
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#warning Need to fix this if we want to use g13
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opt.outfp = NULL;
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#else
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opt.outfp = es_fdopen_nc (output_fd, "wb");
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#endif
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if (!opt.outfp)
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{
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char xname[64];
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err = gpg_error_from_syserror ();
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snprintf (xname, sizeof xname, "[fd %d]", output_fd);
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log_error (_("can't open `%s': %s\n"), xname, gpg_strerror (err));
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iobuf_close (fp);
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release_progress_context (pfx);
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return err;
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}
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if (!opt.no_armor)
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{
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if (use_armor_filter (fp))
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{
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afx = new_armor_context ();
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push_armor_filter ( afx, fp );
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}
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}
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err = proc_encryption_packets (ctrl, NULL, fp );
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iobuf_close (fp);
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es_fclose (opt.outfp);
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opt.outfp = NULL;
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release_armor_context (afx);
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release_progress_context (pfx);
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return err;
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}
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void
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decrypt_messages (ctrl_t ctrl, int nfiles, char *files[])
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{
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IOBUF fp;
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armor_filter_context_t *afx = NULL;
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progress_filter_context_t *pfx;
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char *p, *output = NULL;
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int rc=0,use_stdin=0;
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unsigned int lno=0;
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if (opt.outfile)
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{
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log_error(_("--output doesn't work for this command\n"));
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return;
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}
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pfx = new_progress_context ();
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if(!nfiles)
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use_stdin=1;
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for(;;)
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{
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char line[2048];
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char *filename=NULL;
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if(use_stdin)
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{
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if(fgets(line, DIM(line), stdin))
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{
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lno++;
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if (!*line || line[strlen(line)-1] != '\n')
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log_error("input line %u too long or missing LF\n", lno);
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else
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{
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line[strlen(line)-1] = '\0';
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filename=line;
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}
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}
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}
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else
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{
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if(nfiles)
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{
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filename=*files;
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nfiles--;
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files++;
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}
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}
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if(filename==NULL)
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break;
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print_file_status(STATUS_FILE_START, filename, 3);
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output = make_outfile_name(filename);
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if (!output)
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goto next_file;
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fp = iobuf_open(filename);
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if (fp)
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iobuf_ioctl (fp, IOBUF_IOCTL_NO_CACHE, 1, NULL);
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if (fp && is_secured_file (iobuf_get_fd (fp)))
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{
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iobuf_close (fp);
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fp = NULL;
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gpg_err_set_errno (EPERM);
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}
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if (!fp)
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{
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log_error(_("can't open `%s'\n"), print_fname_stdin(filename));
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goto next_file;
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}
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handle_progress (pfx, fp, filename);
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if (!opt.no_armor)
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{
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if (use_armor_filter(fp))
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{
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afx = new_armor_context ();
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push_armor_filter ( afx, fp );
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}
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}
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rc = proc_packets (ctrl,NULL, fp);
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iobuf_close(fp);
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if (rc)
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log_error("%s: decryption failed: %s\n", print_fname_stdin(filename),
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g10_errstr(rc));
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p = get_last_passphrase();
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set_next_passphrase(p);
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xfree (p);
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next_file:
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/* Note that we emit file_done even after an error. */
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write_status( STATUS_FILE_DONE );
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xfree(output);
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reset_literals_seen();
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}
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set_next_passphrase(NULL);
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release_armor_context (afx);
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release_progress_context (pfx);
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}
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