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gnupg/g10/plaintext.c
Werner Koch 096e7457ec Change all quotes in strings and comments to the new GNU standard. 
The asymmetric quotes used by GNU in the past (`...') don't render
nicely on modern systems.  We now use two \x27 characters ('...').

The proper solution would be to use the correct Unicode symmetric
quotes here.  However this has the disadvantage that the system
requires Unicode support.  We don't want that today.  If Unicode is
available a generated po file can be used to output proper quotes.  A
simple sed script like the one used for en@quote is sufficient to
change them.

The changes have been done by applying

  sed -i "s/\`\([^'\`]*\)'/'\1'/g"

to most files and fixing obvious problems by hand.  The msgid strings in
the po files were fixed with a similar command.
2012-06-05 19:29:22 +02:00

745 lines
18 KiB
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/* plaintext.c - process plaintext packets
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
* 2006, 2009, 2010 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <sys/types.h>
#ifdef HAVE_DOSISH_SYSTEM
# include <fcntl.h> /* for setmode() */
#endif
#include "gpg.h"
#include "util.h"
#include "options.h"
#include "packet.h"
#include "ttyio.h"
#include "filter.h"
#include "main.h"
#include "status.h"
#include "i18n.h"
/* Handle a plaintext packet. If MFX is not NULL, update the MDs
* Note: We should have used the filter stuff here, but we have to add
* some easy mimic to set a read limit, so we calculate only the bytes
* from the plaintext. */
int
handle_plaintext (PKT_plaintext * pt, md_filter_context_t * mfx,
int nooutput, int clearsig)
{
char *fname = NULL;
estream_t fp = NULL;
static off_t count = 0;
int err = 0;
int c;
int convert = (pt->mode == 't' || pt->mode == 'u');
#ifdef __riscos__
int filetype = 0xfff;
#endif
/* Let people know what the plaintext info is. This allows the
receiving program to try and do something different based on the
format code (say, recode UTF-8 to local). */
if (!nooutput && is_status_enabled ())
{
char status[50];
/* Better make sure that stdout has been flushed in case the
output will be written to it. This is to make sure that no
not-yet-flushed stuff will be written after the plaintext
status message. */
es_fflush (es_stdout);
snprintf (status, sizeof status,
"%X %lu ", (byte) pt->mode, (ulong) pt->timestamp);
write_status_text_and_buffer (STATUS_PLAINTEXT,
status, pt->name, pt->namelen, 0);
if (!pt->is_partial)
{
snprintf (status, sizeof status, "%lu", (ulong) pt->len);
write_status_text (STATUS_PLAINTEXT_LENGTH, status);
}
}
/* Create the filename as C string. */
if (nooutput)
;
else if (opt.outfp)
{
fname = xtrystrdup ("[FP]");
if (!fname)
{
err = gpg_error_from_syserror ();
goto leave;
}
}
else if (opt.outfile)
{
fname = xtrystrdup (opt.outfile);
if (!fname)
{
err = gpg_error_from_syserror ();
goto leave;
}
}
else if (pt->namelen == 8 && !memcmp (pt->name, "_CONSOLE", 8))
{
log_info (_("data not saved; use option \"--output\" to save it\n"));
nooutput = 1;
}
else if (!opt.flags.use_embedded_filename)
{
fname = make_outfile_name (iobuf_get_real_fname (pt->buf));
if (!fname)
fname = ask_outfile_name (pt->name, pt->namelen);
if (!fname)
{
err = gpg_error (GPG_ERR_GENERAL); /* Can't create file. */
goto leave;
}
}
else
fname = utf8_to_native (pt->name, pt->namelen, 0);
if (nooutput)
;
else if (opt.outfp)
{
fp = opt.outfp;
es_set_binary (fp);
}
else if (iobuf_is_pipe_filename (fname) || !*fname)
{
/* No filename or "-" given; write to stdout. */
fp = es_stdout;
es_set_binary (fp);
}
else
{
while (!overwrite_filep (fname))
{
char *tmp = ask_outfile_name (NULL, 0);
if (!tmp || !*tmp)
{
xfree (tmp);
/* FIXME: Below used to be G10ERR_CREATE_FILE */
err = gpg_error (GPG_ERR_GENERAL);
goto leave;
}
xfree (fname);
fname = tmp;
}
}
#ifndef __riscos__
if (opt.outfp && is_secured_file (es_fileno (opt.outfp)))
{
err = gpg_error (GPG_ERR_EPERM);
log_error (_("error creating '%s': %s\n"), fname, gpg_strerror (err));
goto leave;
}
else if (fp || nooutput)
;
else if (is_secured_filename (fname))
{
gpg_err_set_errno (EPERM);
err = gpg_error_from_syserror ();
log_error (_("error creating '%s': %s\n"), fname, gpg_strerror (err));
goto leave;
}
else if (!(fp = es_fopen (fname, "wb")))
{
err = gpg_error_from_syserror ();
log_error (_("error creating '%s': %s\n"), fname, gpg_strerror (err));
goto leave;
}
#else /* __riscos__ */
/* If no output filename was given, i.e. we constructed it, convert
all '.' in fname to '/' but not vice versa as we don't create
directories! */
if (!opt.outfile)
for (c = 0; fname[c]; ++c)
if (fname[c] == '.')
fname[c] = '/';
if (fp || nooutput)
;
else
{
/* Note: riscos stuff is not expected to wrok anymore. If we
want to port it again to riscos we should do most of the suff
in estream. FIXME: Consider to remove all riscos special
cases. */
fp = fopen (fname, "wb");
if (!fp)
{
log_error (_("error creating '%s': %s\n"), fname, gpg_strerror (err));
err = G10ERR_CREATE_FILE;
if (errno == 106)
log_info ("Do output file and input file have the same name?\n");
goto leave;
}
/* If there's a ,xxx extension in the embedded filename,
use that, else check whether the user input (in fname)
has a ,xxx appended, then use that in preference */
if ((c = riscos_get_filetype_from_string (pt->name, pt->namelen)) != -1)
filetype = c;
if ((c = riscos_get_filetype_from_string (fname, strlen (fname))) != -1)
filetype = c;
riscos_set_filetype_by_number (fname, filetype);
}
#endif /* __riscos__ */
if (!pt->is_partial)
{
/* We have an actual length (which might be zero). */
if (clearsig)
{
log_error ("clearsig encountered while not expected\n");
err = gpg_error (GPG_ERR_UNEXPECTED);
goto leave;
}
if (convert) /* Text mode. */
{
for (; pt->len; pt->len--)
{
if ((c = iobuf_get (pt->buf)) == -1)
{
err = gpg_error_from_syserror ();
log_error ("problem reading source (%u bytes remaining)\n",
(unsigned) pt->len);
goto leave;
}
if (mfx->md)
gcry_md_putc (mfx->md, c);
#ifndef HAVE_DOSISH_SYSTEM
if (c == '\r') /* convert to native line ending */
continue; /* fixme: this hack might be too simple */
#endif
if (fp)
{
if (opt.max_output && (++count) > opt.max_output)
{
log_error ("error writing to '%s': %s\n",
fname, "exceeded --max-output limit\n");
err = gpg_error (GPG_ERR_TOO_LARGE);
goto leave;
}
else if (es_putc (c, fp) == EOF)
{
if (es_ferror (fp))
err = gpg_error_from_syserror ();
else
err = gpg_error (GPG_ERR_EOF);
log_error ("error writing to '%s': %s\n",
fname, gpg_strerror (err));
goto leave;
}
}
}
}
else /* Binary mode. */
{
byte *buffer = xmalloc (32768);
while (pt->len)
{
int len = pt->len > 32768 ? 32768 : pt->len;
len = iobuf_read (pt->buf, buffer, len);
if (len == -1)
{
err = gpg_error_from_syserror ();
log_error ("problem reading source (%u bytes remaining)\n",
(unsigned) pt->len);
xfree (buffer);
goto leave;
}
if (mfx->md)
gcry_md_write (mfx->md, buffer, len);
if (fp)
{
if (opt.max_output && (count += len) > opt.max_output)
{
log_error ("error writing to '%s': %s\n",
fname, "exceeded --max-output limit\n");
err = gpg_error (GPG_ERR_TOO_LARGE);
xfree (buffer);
goto leave;
}
else if (es_fwrite (buffer, 1, len, fp) != len)
{
err = gpg_error_from_syserror ();
log_error ("error writing to '%s': %s\n",
fname, gpg_strerror (err));
xfree (buffer);
goto leave;
}
}
pt->len -= len;
}
xfree (buffer);
}
}
else if (!clearsig)
{
if (convert)
{ /* text mode */
while ((c = iobuf_get (pt->buf)) != -1)
{
if (mfx->md)
gcry_md_putc (mfx->md, c);
#ifndef HAVE_DOSISH_SYSTEM
if (convert && c == '\r')
continue; /* fixme: this hack might be too simple */
#endif
if (fp)
{
if (opt.max_output && (++count) > opt.max_output)
{
log_error ("Error writing to '%s': %s\n",
fname, "exceeded --max-output limit\n");
err = gpg_error (GPG_ERR_TOO_LARGE);
goto leave;
}
else if (es_putc (c, fp) == EOF)
{
if (es_ferror (fp))
err = gpg_error_from_syserror ();
else
err = gpg_error (GPG_ERR_EOF);
log_error ("error writing to '%s': %s\n",
fname, gpg_strerror (err));
goto leave;
}
}
}
}
else
{ /* binary mode */
byte *buffer;
int eof_seen = 0;
buffer = xtrymalloc (32768);
if (!buffer)
{
err = gpg_error_from_syserror ();
goto leave;
}
while (!eof_seen)
{
/* Why do we check for len < 32768:
* If we won't, we would practically read 2 EOFs but
* the first one has already popped the block_filter
* off and therefore we don't catch the boundary.
* So, always assume EOF if iobuf_read returns less bytes
* then requested */
int len = iobuf_read (pt->buf, buffer, 32768);
if (len == -1)
break;
if (len < 32768)
eof_seen = 1;
if (mfx->md)
gcry_md_write (mfx->md, buffer, len);
if (fp)
{
if (opt.max_output && (count += len) > opt.max_output)
{
log_error ("error writing to '%s': %s\n",
fname, "exceeded --max-output limit\n");
err = gpg_error (GPG_ERR_TOO_LARGE);
xfree (buffer);
goto leave;
}
else if (es_fwrite (buffer, 1, len, fp) != len)
{
err = gpg_error_from_syserror ();
log_error ("error writing to '%s': %s\n",
fname, gpg_strerror (err));
xfree (buffer);
goto leave;
}
}
}
xfree (buffer);
}
pt->buf = NULL;
}
else /* Clear text signature - don't hash the last CR,LF. */
{
int state = 0;
while ((c = iobuf_get (pt->buf)) != -1)
{
if (fp)
{
if (opt.max_output && (++count) > opt.max_output)
{
log_error ("error writing to '%s': %s\n",
fname, "exceeded --max-output limit\n");
err = gpg_error (GPG_ERR_TOO_LARGE);
goto leave;
}
else if (es_putc (c, fp) == EOF)
{
err = gpg_error_from_syserror ();
log_error ("error writing to '%s': %s\n",
fname, gpg_strerror (err));
goto leave;
}
}
if (!mfx->md)
continue;
if (state == 2)
{
gcry_md_putc (mfx->md, '\r');
gcry_md_putc (mfx->md, '\n');
state = 0;
}
if (!state)
{
if (c == '\r')
state = 1;
else if (c == '\n')
state = 2;
else
gcry_md_putc (mfx->md, c);
}
else if (state == 1)
{
if (c == '\n')
state = 2;
else
{
gcry_md_putc (mfx->md, '\r');
if (c == '\r')
state = 1;
else
{
state = 0;
gcry_md_putc (mfx->md, c);
}
}
}
}
pt->buf = NULL;
}
if (fp && fp != es_stdout && fp != opt.outfp && es_fclose (fp))
{
err = gpg_error_from_syserror ();
log_error ("error closing '%s': %s\n", fname, gpg_strerror (err));
fp = NULL;
goto leave;
}
fp = NULL;
leave:
/* Make sure that stdout gets flushed after the plaintext has been
handled. This is for extra security as we do a flush anyway
before checking the signature. */
if (es_fflush (es_stdout))
{
/* We need to check the return code to detect errors like disk
full for short plaintexts. See bug#1207. Checking return
values is a good idea in any case. */
if (!err)
err = gpg_error_from_syserror ();
log_error ("error flushing '%s': %s\n", "[stdout]",
gpg_strerror (err));
}
if (fp && fp != es_stdout && fp != opt.outfp)
es_fclose (fp);
xfree (fname);
return err;
}
static void
do_hash (gcry_md_hd_t md, gcry_md_hd_t md2, IOBUF fp, int textmode)
{
text_filter_context_t tfx;
int c;
if (textmode)
{
memset (&tfx, 0, sizeof tfx);
iobuf_push_filter (fp, text_filter, &tfx);
}
if (md2)
{ /* work around a strange behaviour in pgp2 */
/* It seems that at least PGP5 converts a single CR to a CR,LF too */
int lc = -1;
while ((c = iobuf_get (fp)) != -1)
{
if (c == '\n' && lc == '\r')
gcry_md_putc (md2, c);
else if (c == '\n')
{
gcry_md_putc (md2, '\r');
gcry_md_putc (md2, c);
}
else if (c != '\n' && lc == '\r')
{
gcry_md_putc (md2, '\n');
gcry_md_putc (md2, c);
}
else
gcry_md_putc (md2, c);
if (md)
gcry_md_putc (md, c);
lc = c;
}
}
else
{
while ((c = iobuf_get (fp)) != -1)
{
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;
}
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