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git://git.gnupg.org/gnupg.git
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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.
745 lines
18 KiB
C
745 lines
18 KiB
C
/* plaintext.c - process plaintext packets
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* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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* 2006, 2009, 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 <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 <sys/types.h>
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#ifdef HAVE_DOSISH_SYSTEM
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# include <fcntl.h> /* for setmode() */
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#endif
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#include "gpg.h"
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#include "util.h"
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#include "options.h"
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#include "packet.h"
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#include "ttyio.h"
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#include "filter.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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/* Handle a plaintext packet. If MFX is not NULL, update the MDs
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* Note: We should have used the filter stuff here, but we have to add
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* some easy mimic to set a read limit, so we calculate only the bytes
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* from the plaintext. */
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int
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handle_plaintext (PKT_plaintext * pt, md_filter_context_t * mfx,
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int nooutput, int clearsig)
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{
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char *fname = NULL;
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estream_t fp = NULL;
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static off_t count = 0;
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int err = 0;
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int c;
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int convert = (pt->mode == 't' || pt->mode == 'u');
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#ifdef __riscos__
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int filetype = 0xfff;
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#endif
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/* Let people know what the plaintext info is. This allows the
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receiving program to try and do something different based on the
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format code (say, recode UTF-8 to local). */
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if (!nooutput && is_status_enabled ())
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{
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char status[50];
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/* Better make sure that stdout has been flushed in case the
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output will be written to it. This is to make sure that no
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not-yet-flushed stuff will be written after the plaintext
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status message. */
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es_fflush (es_stdout);
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snprintf (status, sizeof status,
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"%X %lu ", (byte) pt->mode, (ulong) pt->timestamp);
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write_status_text_and_buffer (STATUS_PLAINTEXT,
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status, pt->name, pt->namelen, 0);
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if (!pt->is_partial)
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{
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snprintf (status, sizeof status, "%lu", (ulong) pt->len);
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write_status_text (STATUS_PLAINTEXT_LENGTH, status);
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}
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}
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/* Create the filename as C string. */
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if (nooutput)
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;
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else if (opt.outfp)
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{
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fname = xtrystrdup ("[FP]");
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if (!fname)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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}
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else if (opt.outfile)
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{
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fname = xtrystrdup (opt.outfile);
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if (!fname)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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}
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else if (pt->namelen == 8 && !memcmp (pt->name, "_CONSOLE", 8))
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{
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log_info (_("data not saved; use option \"--output\" to save it\n"));
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nooutput = 1;
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}
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else if (!opt.flags.use_embedded_filename)
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{
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fname = make_outfile_name (iobuf_get_real_fname (pt->buf));
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if (!fname)
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fname = ask_outfile_name (pt->name, pt->namelen);
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if (!fname)
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{
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err = gpg_error (GPG_ERR_GENERAL); /* Can't create file. */
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goto leave;
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}
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}
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else
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fname = utf8_to_native (pt->name, pt->namelen, 0);
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if (nooutput)
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;
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else if (opt.outfp)
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{
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fp = opt.outfp;
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es_set_binary (fp);
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}
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else if (iobuf_is_pipe_filename (fname) || !*fname)
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{
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/* No filename or "-" given; write to stdout. */
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fp = es_stdout;
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es_set_binary (fp);
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}
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else
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{
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while (!overwrite_filep (fname))
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{
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char *tmp = ask_outfile_name (NULL, 0);
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if (!tmp || !*tmp)
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{
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xfree (tmp);
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/* FIXME: Below used to be G10ERR_CREATE_FILE */
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err = gpg_error (GPG_ERR_GENERAL);
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goto leave;
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}
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xfree (fname);
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fname = tmp;
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}
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}
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#ifndef __riscos__
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if (opt.outfp && is_secured_file (es_fileno (opt.outfp)))
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{
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err = gpg_error (GPG_ERR_EPERM);
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log_error (_("error creating `%s': %s\n"), fname, gpg_strerror (err));
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goto leave;
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}
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else if (fp || nooutput)
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;
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else if (is_secured_filename (fname))
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{
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gpg_err_set_errno (EPERM);
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err = gpg_error_from_syserror ();
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log_error (_("error creating `%s': %s\n"), fname, gpg_strerror (err));
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goto leave;
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}
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else if (!(fp = es_fopen (fname, "wb")))
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{
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err = gpg_error_from_syserror ();
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log_error (_("error creating `%s': %s\n"), fname, gpg_strerror (err));
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goto leave;
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}
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#else /* __riscos__ */
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/* If no output filename was given, i.e. we constructed it, convert
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all '.' in fname to '/' but not vice versa as we don't create
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directories! */
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if (!opt.outfile)
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for (c = 0; fname[c]; ++c)
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if (fname[c] == '.')
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fname[c] = '/';
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if (fp || nooutput)
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;
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else
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{
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/* Note: riscos stuff is not expected to wrok anymore. If we
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want to port it again to riscos we should do most of the suff
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in estream. FIXME: Consider to remove all riscos special
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cases. */
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fp = fopen (fname, "wb");
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if (!fp)
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{
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log_error (_("error creating `%s': %s\n"), fname, gpg_strerror (err));
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err = G10ERR_CREATE_FILE;
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if (errno == 106)
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log_info ("Do output file and input file have the same name?\n");
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goto leave;
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}
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/* If there's a ,xxx extension in the embedded filename,
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use that, else check whether the user input (in fname)
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has a ,xxx appended, then use that in preference */
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if ((c = riscos_get_filetype_from_string (pt->name, pt->namelen)) != -1)
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filetype = c;
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if ((c = riscos_get_filetype_from_string (fname, strlen (fname))) != -1)
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filetype = c;
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riscos_set_filetype_by_number (fname, filetype);
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}
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#endif /* __riscos__ */
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if (!pt->is_partial)
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{
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/* We have an actual length (which might be zero). */
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if (clearsig)
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{
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log_error ("clearsig encountered while not expected\n");
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err = gpg_error (GPG_ERR_UNEXPECTED);
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goto leave;
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}
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if (convert) /* Text mode. */
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{
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for (; pt->len; pt->len--)
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{
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if ((c = iobuf_get (pt->buf)) == -1)
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{
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err = gpg_error_from_syserror ();
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log_error ("problem reading source (%u bytes remaining)\n",
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(unsigned) pt->len);
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goto leave;
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}
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if (mfx->md)
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gcry_md_putc (mfx->md, c);
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#ifndef HAVE_DOSISH_SYSTEM
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if (c == '\r') /* convert to native line ending */
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continue; /* fixme: this hack might be too simple */
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#endif
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if (fp)
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{
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if (opt.max_output && (++count) > opt.max_output)
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{
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log_error ("error writing to `%s': %s\n",
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fname, "exceeded --max-output limit\n");
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err = gpg_error (GPG_ERR_TOO_LARGE);
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goto leave;
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}
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else if (es_putc (c, fp) == EOF)
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{
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if (es_ferror (fp))
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err = gpg_error_from_syserror ();
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else
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err = gpg_error (GPG_ERR_EOF);
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log_error ("error writing to `%s': %s\n",
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fname, gpg_strerror (err));
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goto leave;
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}
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}
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}
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}
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else /* Binary mode. */
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{
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byte *buffer = xmalloc (32768);
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while (pt->len)
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{
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int len = pt->len > 32768 ? 32768 : pt->len;
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len = iobuf_read (pt->buf, buffer, len);
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if (len == -1)
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{
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err = gpg_error_from_syserror ();
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log_error ("problem reading source (%u bytes remaining)\n",
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(unsigned) pt->len);
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xfree (buffer);
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goto leave;
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}
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if (mfx->md)
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gcry_md_write (mfx->md, buffer, len);
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if (fp)
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{
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if (opt.max_output && (count += len) > opt.max_output)
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{
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log_error ("error writing to `%s': %s\n",
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fname, "exceeded --max-output limit\n");
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err = gpg_error (GPG_ERR_TOO_LARGE);
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xfree (buffer);
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goto leave;
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}
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else if (es_fwrite (buffer, 1, len, fp) != len)
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{
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err = gpg_error_from_syserror ();
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log_error ("error writing to `%s': %s\n",
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fname, gpg_strerror (err));
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xfree (buffer);
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goto leave;
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}
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}
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pt->len -= len;
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}
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xfree (buffer);
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}
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}
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else if (!clearsig)
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{
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if (convert)
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{ /* text mode */
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while ((c = iobuf_get (pt->buf)) != -1)
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{
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if (mfx->md)
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gcry_md_putc (mfx->md, c);
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#ifndef HAVE_DOSISH_SYSTEM
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if (convert && c == '\r')
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continue; /* fixme: this hack might be too simple */
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#endif
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if (fp)
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{
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if (opt.max_output && (++count) > opt.max_output)
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{
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log_error ("Error writing to `%s': %s\n",
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fname, "exceeded --max-output limit\n");
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err = gpg_error (GPG_ERR_TOO_LARGE);
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goto leave;
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}
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else if (es_putc (c, fp) == EOF)
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{
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if (es_ferror (fp))
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err = gpg_error_from_syserror ();
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else
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err = gpg_error (GPG_ERR_EOF);
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log_error ("error writing to `%s': %s\n",
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fname, gpg_strerror (err));
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goto leave;
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}
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}
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}
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}
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else
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{ /* binary mode */
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byte *buffer;
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int eof_seen = 0;
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buffer = xtrymalloc (32768);
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if (!buffer)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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while (!eof_seen)
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{
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/* Why do we check for len < 32768:
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* If we won't, we would practically read 2 EOFs but
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* the first one has already popped the block_filter
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* off and therefore we don't catch the boundary.
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* So, always assume EOF if iobuf_read returns less bytes
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* then requested */
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int len = iobuf_read (pt->buf, buffer, 32768);
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if (len == -1)
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break;
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if (len < 32768)
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eof_seen = 1;
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if (mfx->md)
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gcry_md_write (mfx->md, buffer, len);
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if (fp)
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{
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if (opt.max_output && (count += len) > opt.max_output)
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{
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log_error ("error writing to `%s': %s\n",
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fname, "exceeded --max-output limit\n");
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err = gpg_error (GPG_ERR_TOO_LARGE);
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xfree (buffer);
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goto leave;
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}
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else if (es_fwrite (buffer, 1, len, fp) != len)
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{
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err = gpg_error_from_syserror ();
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log_error ("error writing to `%s': %s\n",
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fname, gpg_strerror (err));
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xfree (buffer);
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goto leave;
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}
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}
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}
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xfree (buffer);
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}
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pt->buf = NULL;
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}
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else /* Clear text signature - don't hash the last CR,LF. */
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{
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int state = 0;
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while ((c = iobuf_get (pt->buf)) != -1)
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{
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if (fp)
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{
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if (opt.max_output && (++count) > opt.max_output)
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{
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log_error ("error writing to `%s': %s\n",
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fname, "exceeded --max-output limit\n");
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err = gpg_error (GPG_ERR_TOO_LARGE);
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goto leave;
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}
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else if (es_putc (c, fp) == EOF)
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{
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err = gpg_error_from_syserror ();
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log_error ("error writing to `%s': %s\n",
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fname, gpg_strerror (err));
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goto leave;
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}
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}
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if (!mfx->md)
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continue;
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if (state == 2)
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{
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gcry_md_putc (mfx->md, '\r');
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gcry_md_putc (mfx->md, '\n');
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state = 0;
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}
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if (!state)
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{
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if (c == '\r')
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state = 1;
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else if (c == '\n')
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state = 2;
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else
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gcry_md_putc (mfx->md, c);
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}
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else if (state == 1)
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{
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if (c == '\n')
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state = 2;
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else
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{
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gcry_md_putc (mfx->md, '\r');
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if (c == '\r')
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state = 1;
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else
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{
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state = 0;
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gcry_md_putc (mfx->md, c);
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}
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}
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}
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}
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pt->buf = NULL;
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}
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if (fp && fp != es_stdout && fp != opt.outfp && es_fclose (fp))
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{
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err = gpg_error_from_syserror ();
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log_error ("error closing `%s': %s\n", fname, gpg_strerror (err));
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fp = NULL;
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goto leave;
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}
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fp = NULL;
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leave:
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/* Make sure that stdout gets flushed after the plaintext has been
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handled. This is for extra security as we do a flush anyway
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before checking the signature. */
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if (es_fflush (es_stdout))
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{
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/* We need to check the return code to detect errors like disk
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full for short plaintexts. See bug#1207. Checking return
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values is a good idea in any case. */
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if (!err)
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err = gpg_error_from_syserror ();
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log_error ("error flushing `%s': %s\n", "[stdout]",
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gpg_strerror (err));
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}
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if (fp && fp != es_stdout && fp != opt.outfp)
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es_fclose (fp);
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xfree (fname);
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return err;
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}
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static void
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do_hash (gcry_md_hd_t md, gcry_md_hd_t md2, IOBUF fp, int textmode)
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{
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text_filter_context_t tfx;
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int c;
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if (textmode)
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{
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memset (&tfx, 0, sizeof tfx);
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iobuf_push_filter (fp, text_filter, &tfx);
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}
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if (md2)
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{ /* work around a strange behaviour in pgp2 */
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/* It seems that at least PGP5 converts a single CR to a CR,LF too */
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int lc = -1;
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while ((c = iobuf_get (fp)) != -1)
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{
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if (c == '\n' && lc == '\r')
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gcry_md_putc (md2, c);
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else if (c == '\n')
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{
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gcry_md_putc (md2, '\r');
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gcry_md_putc (md2, c);
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}
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else if (c != '\n' && lc == '\r')
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{
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gcry_md_putc (md2, '\n');
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gcry_md_putc (md2, c);
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}
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else
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gcry_md_putc (md2, c);
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if (md)
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gcry_md_putc (md, c);
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lc = c;
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}
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}
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else
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{
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while ((c = iobuf_get (fp)) != -1)
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{
|
|
if (md)
|
|
gcry_md_putc (md, c);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/****************
|
|
* Ask for the detached datafile and calculate the digest from it.
|
|
* INFILE is the name of the input file.
|
|
*/
|
|
int
|
|
ask_for_detached_datafile (gcry_md_hd_t md, gcry_md_hd_t md2,
|
|
const char *inname, int textmode)
|
|
{
|
|
progress_filter_context_t *pfx;
|
|
char *answer = NULL;
|
|
IOBUF fp;
|
|
int rc = 0;
|
|
|
|
pfx = new_progress_context ();
|
|
fp = open_sigfile (inname, pfx); /* Open default file. */
|
|
|
|
if (!fp && !opt.batch)
|
|
{
|
|
int any = 0;
|
|
tty_printf (_("Detached signature.\n"));
|
|
do
|
|
{
|
|
char *name;
|
|
|
|
xfree (answer);
|
|
tty_enable_completion (NULL);
|
|
name = cpr_get ("detached_signature.filename",
|
|
_("Please enter name of data file: "));
|
|
tty_disable_completion ();
|
|
cpr_kill_prompt ();
|
|
answer = make_filename (name, (void *) NULL);
|
|
xfree (name);
|
|
|
|
if (any && !*answer)
|
|
{
|
|
rc = gpg_error (GPG_ERR_GENERAL); /*G10ERR_READ_FILE */
|
|
goto leave;
|
|
}
|
|
fp = iobuf_open (answer);
|
|
if (fp && is_secured_file (iobuf_get_fd (fp)))
|
|
{
|
|
iobuf_close (fp);
|
|
fp = NULL;
|
|
gpg_err_set_errno (EPERM);
|
|
}
|
|
if (!fp && errno == ENOENT)
|
|
{
|
|
tty_printf ("No such file, try again or hit enter to quit.\n");
|
|
any++;
|
|
}
|
|
else if (!fp)
|
|
{
|
|
rc = gpg_error_from_syserror ();
|
|
log_error (_("can't open `%s': %s\n"), answer,
|
|
strerror (errno));
|
|
goto leave;
|
|
}
|
|
}
|
|
while (!fp);
|
|
}
|
|
|
|
if (!fp)
|
|
{
|
|
if (opt.verbose)
|
|
log_info (_("reading stdin ...\n"));
|
|
fp = iobuf_open (NULL);
|
|
assert (fp);
|
|
}
|
|
do_hash (md, md2, fp, textmode);
|
|
iobuf_close (fp);
|
|
|
|
leave:
|
|
xfree (answer);
|
|
release_progress_context (pfx);
|
|
return rc;
|
|
}
|
|
|
|
|
|
|
|
/****************
|
|
* Hash the given files and append the hash to hash context md.
|
|
* If FILES is NULL, hash stdin.
|
|
*/
|
|
int
|
|
hash_datafiles (gcry_md_hd_t md, gcry_md_hd_t md2, strlist_t files,
|
|
const char *sigfilename, int textmode)
|
|
{
|
|
progress_filter_context_t *pfx;
|
|
IOBUF fp;
|
|
strlist_t sl;
|
|
|
|
pfx = new_progress_context ();
|
|
|
|
if (!files)
|
|
{
|
|
/* check whether we can open the signed material */
|
|
fp = open_sigfile (sigfilename, pfx);
|
|
if (fp)
|
|
{
|
|
do_hash (md, md2, fp, textmode);
|
|
iobuf_close (fp);
|
|
release_progress_context (pfx);
|
|
return 0;
|
|
}
|
|
log_error (_("no signed data\n"));
|
|
release_progress_context (pfx);
|
|
return gpg_error (GPG_ERR_NO_DATA);
|
|
}
|
|
|
|
|
|
for (sl = files; sl; sl = sl->next)
|
|
{
|
|
fp = iobuf_open (sl->d);
|
|
if (fp && is_secured_file (iobuf_get_fd (fp)))
|
|
{
|
|
iobuf_close (fp);
|
|
fp = NULL;
|
|
gpg_err_set_errno (EPERM);
|
|
}
|
|
if (!fp)
|
|
{
|
|
int rc = gpg_error_from_syserror ();
|
|
log_error (_("can't open signed data `%s'\n"),
|
|
print_fname_stdin (sl->d));
|
|
release_progress_context (pfx);
|
|
return rc;
|
|
}
|
|
handle_progress (pfx, fp, sl->d);
|
|
do_hash (md, md2, fp, textmode);
|
|
iobuf_close (fp);
|
|
}
|
|
|
|
release_progress_context (pfx);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Hash the data from file descriptor DATA_FD and append the hash to hash
|
|
contexts MD and MD2. */
|
|
int
|
|
hash_datafile_by_fd (gcry_md_hd_t md, gcry_md_hd_t md2, int data_fd,
|
|
int textmode)
|
|
{
|
|
progress_filter_context_t *pfx = new_progress_context ();
|
|
iobuf_t fp;
|
|
|
|
if (is_secured_file (data_fd))
|
|
{
|
|
fp = NULL;
|
|
gpg_err_set_errno (EPERM);
|
|
}
|
|
else
|
|
fp = iobuf_fdopen_nc (data_fd, "rb");
|
|
|
|
if (!fp)
|
|
{
|
|
int rc = gpg_error_from_syserror ();
|
|
log_error (_("can't open signed data fd=%d: %s\n"),
|
|
data_fd, strerror (errno));
|
|
release_progress_context (pfx);
|
|
return rc;
|
|
}
|
|
|
|
handle_progress (pfx, fp, NULL);
|
|
|
|
do_hash (md, md2, fp, textmode);
|
|
|
|
iobuf_close (fp);
|
|
|
|
release_progress_context (pfx);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Set up a plaintext packet with the appropriate filename. If there
|
|
is a --set-filename, use it (it's already UTF8). If there is a
|
|
regular filename, UTF8-ize it if necessary. If there is no
|
|
filenames at all, set the field empty. */
|
|
|
|
PKT_plaintext *
|
|
setup_plaintext_name (const char *filename, IOBUF iobuf)
|
|
{
|
|
PKT_plaintext *pt;
|
|
|
|
if ((filename && !iobuf_is_pipe_filename (filename))
|
|
|| (opt.set_filename && !iobuf_is_pipe_filename (opt.set_filename)))
|
|
{
|
|
char *s;
|
|
|
|
if (opt.set_filename)
|
|
s = make_basename (opt.set_filename, iobuf_get_real_fname (iobuf));
|
|
else if (filename && !opt.flags.utf8_filename)
|
|
{
|
|
char *tmp = native_to_utf8 (filename);
|
|
s = make_basename (tmp, iobuf_get_real_fname (iobuf));
|
|
xfree (tmp);
|
|
}
|
|
else
|
|
s = make_basename (filename, iobuf_get_real_fname (iobuf));
|
|
|
|
pt = xmalloc (sizeof *pt + strlen (s) - 1);
|
|
pt->namelen = strlen (s);
|
|
memcpy (pt->name, s, pt->namelen);
|
|
xfree (s);
|
|
}
|
|
else
|
|
{
|
|
/* no filename */
|
|
pt = xmalloc (sizeof *pt - 1);
|
|
pt->namelen = 0;
|
|
}
|
|
|
|
return pt;
|
|
}
|