File: openfile.c

package info (click to toggle)
gnupg 1.4.18-7+deb8u5
  • links: PTS, VCS
  • area: main
  • in suites: jessie
  • size: 34,476 kB
  • sloc: ansic: 127,074; sh: 7,535; asm: 4,610; makefile: 1,186; yacc: 291; perl: 196; pascal: 72; sed: 16
file content (486 lines) | stat: -rw-r--r-- 12,677 bytes parent folder | download | duplicates (5)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
/* openfile.c
 * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
 *               2005 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 <assert.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "util.h"
#include "memory.h"
#include "ttyio.h"
#include "options.h"
#include "main.h"
#include "status.h"
#include "i18n.h"

#ifdef USE_ONLY_8DOT3
#define SKELEXT ".skl"
#else
#define SKELEXT EXTSEP_S "skel"
#endif

#if defined (HAVE_DRIVE_LETTERS) || defined (__riscos__)
#define CMP_FILENAME(a,b) ascii_strcasecmp( (a), (b) )
#else
#define CMP_FILENAME(a,b) strcmp( (a), (b) )
#endif

#ifdef MKDIR_TAKES_ONE_ARG
#undef mkdir
#define mkdir(a,b) mkdir(a)
#endif

/* FIXME:  Implement opt.interactive. */

/****************
 * Check whether FNAME exists and ask if it's okay to overwrite an
 * existing one.
 * Returns: True: it's okay to overwrite or the file does not exist
 *	    False: Do not overwrite
 */
int
overwrite_filep( const char *fname )
{
    if( iobuf_is_pipe_filename (fname) )
	return 1; /* Writing to stdout is always okay */

    if( access( fname, F_OK ) )
	return 1; /* does not exist */

#ifndef HAVE_DOSISH_SYSTEM
    if ( !strcmp ( fname, "/dev/null" ) )
        return 1; /* does not do any harm */
#endif
#ifdef HAVE_W32_SYSTEM
    if ( !strcmp ( fname, "nul" ) )
        return 1;
#endif

    /* fixme: add some backup stuff in case of overwrite */
    if( opt.answer_yes )
	return 1;
    if( opt.answer_no || opt.batch )
	return 0;  /* do not overwrite */

    tty_printf(_("File `%s' exists. "), fname);
    if( cpr_enabled () )
        tty_printf ("\n");
    if( cpr_get_answer_is_yes("openfile.overwrite.okay",
			       _("Overwrite? (y/N) ")) )
	return 1;
    return 0;
}


/****************
 * Strip know extensions from iname and return a newly allocated
 * filename.  Return NULL if we can't do that.
 *
 * (See vmslib/vms.c for the VMS-specific replacement function,
 * vms_make_outfile_name())
 */
#ifndef __VMS
char *
make_outfile_name( const char *iname )
{
    size_t n;

    if ( iobuf_is_pipe_filename (iname) )
	return xstrdup("-");

    n = strlen(iname);
    if( n > 4 && (    !CMP_FILENAME(iname+n-4, EXTSEP_S "gpg")
		   || !CMP_FILENAME(iname+n-4, EXTSEP_S "pgp")
		   || !CMP_FILENAME(iname+n-4, EXTSEP_S "sig")
		   || !CMP_FILENAME(iname+n-4, EXTSEP_S "asc") ) ) {
	char *buf = xstrdup( iname );
	buf[n-4] = 0;
	return buf;
    }
    else if( n > 5 && !CMP_FILENAME(iname+n-5, EXTSEP_S "sign") ) {
	char *buf = xstrdup( iname );
	buf[n-5] = 0;
	return buf;
    }

    log_info(_("%s: unknown suffix\n"), iname );
    return NULL;
}
#endif /* ndef __VMS */


/****************
 * Ask for a outputfilename and use the given one as default.
 * Return NULL if no file has been given or it is not possible to
 * ask the user.
 */
char *
ask_outfile_name( const char *name, size_t namelen )
{
    size_t n;
    const char *s;
    char *prompt;
    char *fname;
    char *defname;

    if( opt.batch )
	return NULL;

    s = _("Enter new filename");

    defname = name && namelen? make_printable_string( name, namelen, 0): NULL;
    n = strlen(s) + (defname?strlen (defname):0) + 10;
    prompt = xmalloc(n);
    if( defname )
	sprintf(prompt, "%s [%s]: ", s, defname );
    else
	sprintf(prompt, "%s: ", s );
    tty_enable_completion(NULL);
    fname = cpr_get("openfile.askoutname", prompt );
    cpr_kill_prompt();
    tty_disable_completion();
    xfree(prompt);
    if( !*fname ) {
	xfree( fname ); fname = NULL;
	fname = defname; defname = NULL;
    }
    xfree(defname);
    if (fname)
        trim_spaces (fname);
    return fname;
}


/****************
 * Make an output filename for the inputfile INAME.
 * Returns an IOBUF and an errorcode
 * Mode 0 = use ".gpg"
 *	1 = use ".asc"
 *	2 = use ".sig"
 */
int
open_outfile( const char *iname, int mode, IOBUF *a )
{
  int rc = 0;

  *a = NULL;
  if( iobuf_is_pipe_filename (iname) && !opt.outfile ) {
    *a = iobuf_create(NULL);
    if( !*a ) {
      log_error(_("can't open `%s': %s\n"), "[stdout]", strerror(errno) );
      rc = G10ERR_CREATE_FILE;
    }
    else if( opt.verbose )
      log_info(_("writing to stdout\n"));
  }
  else {
    char *buf = NULL;
    const char *name;

    if ( opt.dry_run )
      {
#ifdef HAVE_W32_SYSTEM
        name = "nul";
#else
        name = "/dev/null";
#endif
      }
    else if( opt.outfile )
      name = opt.outfile;
    else {
#ifdef USE_ONLY_8DOT3
      if (opt.mangle_dos_filenames)
        {
          /* It is quite common for DOS system to have only one dot in a
           * a filename So if we have something like this, we simple
           * replace the suffix except in cases where the suffix is
           * larger than 3 characters and not identlically to the new one.
           * We should really map the filenames to 8.3 but this tends to
           * be more complicated and is probaly a duty of the filesystem
           */
          char *dot;
          const char *newsfx = mode==1 ? ".asc" :
                               mode==2 ? ".sig" : ".gpg";

          buf = xmalloc(strlen(iname)+4+1);
          strcpy(buf,iname);
          dot = strrchr(buf, '.' );
          if ( dot && dot > buf && dot[1] && strlen(dot) <= 4
               && CMP_FILENAME(newsfx, dot)
               && !(strchr (dot, '/') || strchr (dot, '\\')))
            {
              /* There is a dot, the dot is not the first character,
                 the suffix is not longer than 3, the suffix is not
                 equal to the new suffix and tehre is no path delimter
                 after the dot (e.g. foo.1/bar): Replace the
                 suffix. */
              strcpy (dot, newsfx );
            }
          else if ( dot && !dot[1] ) /* Don't duplicate a trailing dot. */
            strcpy ( dot, newsfx+1 );
          else
            strcat ( buf, newsfx ); /* Just append the new suffix. */
        }
      if (!buf)
#endif /* USE_ONLY_8DOT3 */
        {
          buf = xmalloc(strlen(iname)+4+1);
#ifdef __VMS
          vms_append_ext (buf, iname,
                         mode==1 ? "asc" : mode==2 ? "sig" : "gpg");
#else /*!def __VMS*/
          strcpy(stpcpy(buf,iname), mode==1 ? EXTSEP_S "asc" :
		                   mode==2 ? EXTSEP_S "sig" : EXTSEP_S "gpg");
#endif /*!def __VMS*/
        }
      name = buf;
    }

    rc = 0;
    while( !overwrite_filep (name) )
      {
        char *tmp = ask_outfile_name (NULL, 0);
        if ( !tmp || !*tmp )
          {
            xfree (tmp);
            rc = G10ERR_FILE_EXISTS;
            break;
          }
        xfree (buf);
        name = buf = tmp;
      }

    if( !rc )
      {
        if (is_secured_filename (name) )
          {
            *a = NULL;
            errno = EPERM;
          }
        else
          *a = iobuf_create( name );
        if( !*a )
          {
            log_error(_("can't create `%s': %s\n"), name, strerror(errno) );
            rc = G10ERR_CREATE_FILE;
          }
        else if( opt.verbose )
          log_info(_("writing to `%s'\n"), name );
      }
    xfree(buf);
  }

  if (*a)
    iobuf_ioctl (*a,3,1,NULL); /* disable fd caching */

  return rc;
}


/* Find a matching data file for the signature file SIGFILENAME and
   return it as a malloced string.  If no matching data file is found,
   return NULL.  */
char *
get_matching_datafile (const char *sigfilename)
{
  char *fname = NULL;
  size_t len;

  if (iobuf_is_pipe_filename (sigfilename))
    return NULL;

  len = strlen (sigfilename);
  if (len > 4
      && (!strcmp (sigfilename + len - 4, EXTSEP_S "sig")
          || (len > 5 && !strcmp(sigfilename + len - 5, EXTSEP_S "sign"))
          || !strcmp(sigfilename + len - 4, EXTSEP_S "asc")))
    {

      fname = xstrdup (sigfilename);
      fname[len-(fname[len-1]=='n'?5:4)] = 0 ;
      if (access (fname, R_OK ))
        {
          /* Not found or other error.  */
          xfree (fname);
          fname = NULL;
        }
    }

  return fname;
}


/****************
 * Try to open a file without the extension ".sig" or ".asc"
 * Return NULL if such a file is not available.
 */
IOBUF
open_sigfile (const char *sigfilename, progress_filter_context_t *pfx)
{
  iobuf_t a = NULL;
  char *buf;

  buf = get_matching_datafile (sigfilename);
  if (buf)
    {
      a = iobuf_open (buf);
      if (a && is_secured_file (iobuf_get_fd (a)))
        {
          iobuf_close (a);
          a = NULL;
          errno = EPERM;
        }
      if (a)
        log_info (_("assuming signed data in `%s'\n"), buf);
      if (a && pfx)
        handle_progress (pfx, a, buf);
      xfree (buf);
    }

  return a;
}


/****************
 * Copy the option file skeleton to the given directory.
 */
static void
copy_options_file( const char *destdir )
{
    const char *datadir = GNUPG_DATADIR;
    char *fname;
    FILE *src, *dst;
    int linefeeds=0;
    int c;
    mode_t oldmask;
    int esc = 0;
    int any_option = 0;

    if( opt.dry_run )
	return;

    fname = xmalloc( strlen(datadir) + strlen(destdir) + 15 );
    strcpy(stpcpy(fname, datadir), DIRSEP_S "options" SKELEXT );
    src = fopen( fname, "r" );
    if (src && is_secured_file (fileno (src)))
      {
        fclose (src);
        src = NULL;
        errno = EPERM;
      }
    if( !src ) {
	log_info (_("can't open `%s': %s\n"), fname, strerror(errno) );
	xfree(fname);
	return;
    }
    strcpy(stpcpy(fname, destdir), DIRSEP_S "gpg" EXTSEP_S "conf" );
    oldmask=umask(077);
    if ( is_secured_filename (fname) )
      {
        dst = NULL;
        errno = EPERM;
      }
    else
      dst = fopen( fname, "w" );
    umask(oldmask);
    if( !dst ) {
	log_info (_("can't create `%s': %s\n"), fname, strerror(errno) );
	fclose( src );
	xfree(fname);
	return;
    }

    while( (c=getc(src)) != EOF ) {
	if( linefeeds < 3 ) {
	    if( c == '\n' )
		linefeeds++;
	}
	else {
	    putc( c, dst );
            if (c== '\n')
                esc = 1;
            else if (esc == 1) {
                if (c == ' ' || c == '\t')
                    ;
                else if (c == '#')
                    esc = 2;
                else
                    any_option = 1;
            }
        }
    }
    fclose( dst );
    fclose( src );
    log_info(_("new configuration file `%s' created\n"), fname );
    if (any_option)
        log_info (_("WARNING: options in `%s'"
                    " are not yet active during this run\n"),
                  fname);
    xfree(fname);
}


void
try_make_homedir( const char *fname )
{
    const char *defhome = GNUPG_HOMEDIR;

    /* Create the directory only if the supplied directory name
     * is the same as the default one.  This way we avoid to create
     * arbitrary directories when a non-default homedirectory is used.
     * To cope with HOME, we do compare only the suffix if we see that
     * the default homedir does start with a tilde.
     */
    if( opt.dry_run || opt.no_homedir_creation )
	return;

    if ( ( *defhome == '~'
           && ( strlen(fname) >= strlen (defhome+1)
                && !strcmp(fname+strlen(fname)-strlen(defhome+1),
                           defhome+1 ) ))
         || ( *defhome != '~'
              && !compare_filenames( fname, defhome ) )
        ) {
	if( mkdir( fname, S_IRUSR|S_IWUSR|S_IXUSR ) )
	    log_fatal( _("can't create directory `%s': %s\n"),
					fname,	strerror(errno) );
	else if( !opt.quiet )
	    log_info( _("directory `%s' created\n"), fname );

#ifdef __VMS
       /* Explicitly remove group and world (other) access, which may
          be allowed by default. */
       if (chmod (fname, S_IRWXU ))
         log_fatal ("can't set protection on directory `%s': %s\n",
                    fname, strerror (errno));
#endif /*def __VMS*/

	copy_options_file( fname );
/*  	log_info(_("you have to start GnuPG again, " */
/*  		   "so it can read the new configuration file\n") ); */
/*  	g10_exit(1); */
    }
}