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
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
|
/* sysutils.c - system helpers
* Copyright (C) 1998, 1999, 2000, 2001, 2003, 2004,
* 2007, 2008 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>
#ifdef WITHOUT_GNU_PTH /* Give the Makefile a chance to build without Pth. */
# undef HAVE_PTH
# undef USE_GNU_PTH
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#ifdef HAVE_STAT
# include <sys/stat.h>
#endif
#if defined(__linux__) && defined(__alpha__) && __GLIBC__ < 2
# include <asm/sysinfo.h>
# include <asm/unistd.h>
#endif
#ifdef HAVE_SETRLIMIT
# include <time.h>
# include <sys/time.h>
# include <sys/resource.h>
#endif
#ifdef HAVE_W32_SYSTEM
# define WINVER 0x0500 /* Required for AllowSetForegroundWindow. */
# include <windows.h>
#endif
#ifdef HAVE_PTH
# include <pth.h>
#endif
#include <fcntl.h>
#include "setenv.h" /* Gnulib replacement. */
#include "util.h"
#include "i18n.h"
#include "sysutils.h"
#define tohex(n) ((n) < 10 ? ((n) + '0') : (((n) - 10) + 'A'))
#if defined(__linux__) && defined(__alpha__) && __GLIBC__ < 2
#warning using trap_unaligned
static int
setsysinfo(unsigned long op, void *buffer, unsigned long size,
int *start, void *arg, unsigned long flag)
{
return syscall(__NR_osf_setsysinfo, op, buffer, size, start, arg, flag);
}
void
trap_unaligned(void)
{
unsigned int buf[2];
buf[0] = SSIN_UACPROC;
buf[1] = UAC_SIGBUS | UAC_NOPRINT;
setsysinfo(SSI_NVPAIRS, buf, 1, 0, 0, 0);
}
#else
void
trap_unaligned(void)
{ /* dummy */
}
#endif
int
disable_core_dumps (void)
{
#ifdef HAVE_DOSISH_SYSTEM
return 0;
#else
# ifdef HAVE_SETRLIMIT
struct rlimit limit;
/* We only set the current limit unless we were not able to
retrieve the old value. */
if (getrlimit (RLIMIT_CORE, &limit))
limit.rlim_max = 0;
limit.rlim_cur = 0;
if( !setrlimit (RLIMIT_CORE, &limit) )
return 0;
if( errno != EINVAL && errno != ENOSYS )
log_fatal (_("can't disable core dumps: %s\n"), strerror(errno) );
#endif
return 1;
#endif
}
int
enable_core_dumps (void)
{
#ifdef HAVE_DOSISH_SYSTEM
return 0;
#else
# ifdef HAVE_SETRLIMIT
struct rlimit limit;
if (getrlimit (RLIMIT_CORE, &limit))
return 1;
limit.rlim_cur = limit.rlim_max;
setrlimit (RLIMIT_CORE, &limit);
return 1; /* We always return true because this function is
merely a debugging aid. */
# endif
return 1;
#endif
}
/* Return a string which is used as a kind of process ID. */
const byte *
get_session_marker (size_t *rlen)
{
static byte marker[SIZEOF_UNSIGNED_LONG*2];
static int initialized;
if (!initialized)
{
gcry_create_nonce (marker, sizeof marker);
initialized = 1;
}
*rlen = sizeof (marker);
return marker;
}
#if 0 /* not yet needed - Note that this will require inclusion of
cmacros.am in Makefile.am */
int
check_permissions(const char *path,int extension,int checkonly)
{
#if defined(HAVE_STAT) && !defined(HAVE_DOSISH_SYSTEM)
char *tmppath;
struct stat statbuf;
int ret=1;
int isdir=0;
if(opt.no_perm_warn)
return 0;
if(extension && path[0]!=DIRSEP_C)
{
if(strchr(path,DIRSEP_C))
tmppath=make_filename(path,NULL);
else
tmppath=make_filename(GNUPG_LIBDIR,path,NULL);
}
else
tmppath=m_strdup(path);
/* It's okay if the file doesn't exist */
if(stat(tmppath,&statbuf)!=0)
{
ret=0;
goto end;
}
isdir=S_ISDIR(statbuf.st_mode);
/* Per-user files must be owned by the user. Extensions must be
owned by the user or root. */
if((!extension && statbuf.st_uid != getuid()) ||
(extension && statbuf.st_uid!=0 && statbuf.st_uid!=getuid()))
{
if(!checkonly)
log_info(_("Warning: unsafe ownership on %s \"%s\"\n"),
isdir?"directory":extension?"extension":"file",path);
goto end;
}
/* This works for both directories and files - basically, we don't
care what the owner permissions are, so long as the group and
other permissions are 0 for per-user files, and non-writable for
extensions. */
if((extension && (statbuf.st_mode & (S_IWGRP|S_IWOTH)) !=0) ||
(!extension && (statbuf.st_mode & (S_IRWXG|S_IRWXO)) != 0))
{
char *dir;
/* However, if the directory the directory/file is in is owned
by the user and is 700, then this is not a problem.
Theoretically, we could walk this test up to the root
directory /, but for the sake of sanity, I'm stopping at one
level down. */
dir= make_dirname (tmppath);
if(stat(dir,&statbuf)==0 && statbuf.st_uid==getuid() &&
S_ISDIR(statbuf.st_mode) && (statbuf.st_mode & (S_IRWXG|S_IRWXO))==0)
{
xfree (dir);
ret=0;
goto end;
}
m_free(dir);
if(!checkonly)
log_info(_("Warning: unsafe permissions on %s \"%s\"\n"),
isdir?"directory":extension?"extension":"file",path);
goto end;
}
ret=0;
end:
m_free(tmppath);
return ret;
#endif /* HAVE_STAT && !HAVE_DOSISH_SYSTEM */
return 0;
}
#endif
/* Wrapper around the usual sleep fucntion. This one won't wake up
before the sleep time has really elapsed. When build with Pth it
merely calls pth_sleep and thus suspends only the current
thread. */
void
gnupg_sleep (unsigned int seconds)
{
#ifdef HAVE_PTH
/* With Pth we force a regular sleep for seconds == 0 so that also
the process will give up its timeslot. */
if (!seconds)
{
# ifdef HAVE_W32_SYSTEM
Sleep (0);
# else
sleep (0);
# endif
}
pth_sleep (seconds);
#else
/* Fixme: make sure that a sleep won't wake up to early. */
# ifdef HAVE_W32_SYSTEM
Sleep (seconds*1000);
# else
sleep (seconds);
# endif
#endif
}
/* This function is a NOP for POSIX systems but required under Windows
as the file handles as returned by OS calls (like CreateFile) are
different from the libc file descriptors (like open). This function
translates system file handles to libc file handles. FOR_WRITE
gives the direction of the handle. */
int
translate_sys2libc_fd (gnupg_fd_t fd, int for_write)
{
#if defined(HAVE_W32CE_SYSTEM)
(void)for_write;
return (int)fd;
#elif defined(HAVE_W32_SYSTEM)
int x;
if (fd == GNUPG_INVALID_FD)
return -1;
/* Note that _open_osfhandle is currently defined to take and return
a long. */
x = _open_osfhandle ((long)fd, for_write ? 1 : 0);
if (x == -1)
log_error ("failed to translate osfhandle %p\n", (void *) fd);
return x;
#else /*!HAVE_W32_SYSTEM */
(void)for_write;
return fd;
#endif
}
/* This is the same as translate_sys2libc_fd but takes an integer
which is assumed to be such an system handle. */
int
translate_sys2libc_fd_int (int fd, int for_write)
{
#ifdef HAVE_W32_SYSTEM
if (fd <= 2)
return fd; /* Do not do this for error, stdin, stdout, stderr. */
return translate_sys2libc_fd ((void*)fd, for_write);
#else
(void)for_write;
return fd;
#endif
}
/* Replacement for tmpfile(). This is required because the tmpfile
function of Windows' runtime library is broken, insecure, ignores
TMPDIR and so on. In addition we create a file with an inheritable
handle. */
FILE *
gnupg_tmpfile (void)
{
#ifdef HAVE_W32_SYSTEM
int attempts, n;
#ifdef HAVE_W32CE_SYSTEM
wchar_t buffer[MAX_PATH+7+12+1];
# define mystrlen(a) wcslen (a)
wchar_t *name, *p;
#else
char buffer[MAX_PATH+7+12+1];
# define mystrlen(a) strlen (a)
char *name, *p;
#endif
HANDLE file;
int pid = GetCurrentProcessId ();
unsigned int value;
int i;
SECURITY_ATTRIBUTES sec_attr;
memset (&sec_attr, 0, sizeof sec_attr );
sec_attr.nLength = sizeof sec_attr;
sec_attr.bInheritHandle = TRUE;
n = GetTempPath (MAX_PATH+1, buffer);
if (!n || n > MAX_PATH || mystrlen (buffer) > MAX_PATH)
{
gpg_err_set_errno (ENOENT);
return NULL;
}
p = buffer + mystrlen (buffer);
#ifdef HAVE_W32CE_SYSTEM
wcscpy (p, L"_gnupg");
p += 7;
#else
p = stpcpy (p, "_gnupg");
#endif
/* We try to create the directory but don't care about an error as
it may already exist and the CreateFile would throw an error
anyway. */
CreateDirectory (buffer, NULL);
*p++ = '\\';
name = p;
for (attempts=0; attempts < 10; attempts++)
{
p = name;
value = (GetTickCount () ^ ((pid<<16) & 0xffff0000));
for (i=0; i < 8; i++)
{
*p++ = tohex (((value >> 28) & 0x0f));
value <<= 4;
}
#ifdef HAVE_W32CE_SYSTEM
wcscpy (p, L".tmp");
#else
strcpy (p, ".tmp");
#endif
file = CreateFile (buffer,
GENERIC_READ | GENERIC_WRITE,
0,
&sec_attr,
CREATE_NEW,
FILE_ATTRIBUTE_TEMPORARY | FILE_FLAG_DELETE_ON_CLOSE,
NULL);
if (file != INVALID_HANDLE_VALUE)
{
FILE *fp;
#ifdef HAVE_W32CE_SYSTEM
int fd = (int)file;
fp = _wfdopen (fd, L"w+b");
#else
int fd = _open_osfhandle ((long)file, 0);
if (fd == -1)
{
CloseHandle (file);
return NULL;
}
fp = fdopen (fd, "w+b");
#endif
if (!fp)
{
int save = errno;
close (fd);
gpg_err_set_errno (save);
return NULL;
}
return fp;
}
Sleep (1); /* One ms as this is the granularity of GetTickCount. */
}
gpg_err_set_errno (ENOENT);
return NULL;
#undef mystrlen
#else /*!HAVE_W32_SYSTEM*/
return tmpfile ();
#endif /*!HAVE_W32_SYSTEM*/
}
/* Make sure that the standard file descriptors are opened. Obviously
some folks close them before an exec and the next file we open will
get one of them assigned and thus any output (i.e. diagnostics) end
up in that file (e.g. the trustdb). Not actually a gpg problem as
this will hapen with almost all utilities when called in a wrong
way. However we try to minimize the damage here and raise
awareness of the problem.
Must be called before we open any files! */
void
gnupg_reopen_std (const char *pgmname)
{
#if defined(HAVE_STAT) && !defined(HAVE_W32_SYSTEM)
struct stat statbuf;
int did_stdin = 0;
int did_stdout = 0;
int did_stderr = 0;
FILE *complain;
if (fstat (STDIN_FILENO, &statbuf) == -1 && errno ==EBADF)
{
if (open ("/dev/null",O_RDONLY) == STDIN_FILENO)
did_stdin = 1;
else
did_stdin = 2;
}
if (fstat (STDOUT_FILENO, &statbuf) == -1 && errno == EBADF)
{
if (open ("/dev/null",O_WRONLY) == STDOUT_FILENO)
did_stdout = 1;
else
did_stdout = 2;
}
if (fstat (STDERR_FILENO, &statbuf)==-1 && errno==EBADF)
{
if (open ("/dev/null", O_WRONLY) == STDERR_FILENO)
did_stderr = 1;
else
did_stderr = 2;
}
/* It's hard to log this sort of thing since the filehandle we would
complain to may be closed... */
if (!did_stderr)
complain = stderr;
else if (!did_stdout)
complain = stdout;
else
complain = NULL;
if (complain)
{
if (did_stdin == 1)
fprintf (complain, "%s: WARNING: standard input reopened\n", pgmname);
if (did_stdout == 1)
fprintf (complain, "%s: WARNING: standard output reopened\n", pgmname);
if (did_stderr == 1)
fprintf (complain, "%s: WARNING: standard error reopened\n", pgmname);
if (did_stdin == 2 || did_stdout == 2 || did_stderr == 2)
fprintf(complain,"%s: fatal: unable to reopen standard input,"
" output, or error\n", pgmname);
}
if (did_stdin == 2 || did_stdout == 2 || did_stderr == 2)
exit (3);
#else /* !(HAVE_STAT && !HAVE_W32_SYSTEM) */
(void)pgmname;
#endif
}
/* Hack required for Windows. */
void
gnupg_allow_set_foregound_window (pid_t pid)
{
if (!pid)
log_info ("%s called with invalid pid %lu\n",
"gnupg_allow_set_foregound_window", (unsigned long)pid);
#if defined(HAVE_W32_SYSTEM) && !defined(HAVE_W32CE_SYSTEM)
else if (!AllowSetForegroundWindow ((pid_t)pid == (pid_t)(-1)?ASFW_ANY:pid))
log_info ("AllowSetForegroundWindow(%lu) failed: %s\n",
(unsigned long)pid, w32_strerror (-1));
#endif
}
int
gnupg_remove (const char *fname)
{
#ifdef HAVE_W32CE_SYSTEM
int rc;
wchar_t *wfname;
wfname = utf8_to_wchar (fname);
if (!wfname)
rc = 0;
else
{
rc = DeleteFile (wfname);
xfree (wfname);
}
if (!rc)
gpg_err_set_errno (EIO);
return !rc;
#else
return remove (fname);
#endif
}
/* A wrapper around mkdir which takes a string for the mode argument.
This makes it easier to handle the mode argument which is not
defined on all systems. The format of the modestring is
"-rwxrwxrwx"
'-' is a don't care or not set. 'r', 'w', 'x' are read allowed,
write allowed, execution allowed with the first group for the user,
the second for the group and the third for all others. If the
string is shorter than above the missing mode characters are meant
to be not set. */
int
gnupg_mkdir (const char *name, const char *modestr)
{
#ifdef HAVE_W32CE_SYSTEM
wchar_t *wname;
(void)modestr;
wname = utf8_to_wchar (name);
if (!wname)
return -1;
if (!CreateDirectoryW (wname, NULL))
{
xfree (wname);
return -1; /* ERRNO is automagically provided by gpg-error.h. */
}
xfree (wname);
return 0;
#elif MKDIR_TAKES_ONE_ARG
(void)modestr;
/* Note: In the case of W32 we better use CreateDirectory and try to
set appropriate permissions. However using mkdir is easier
because this sets ERRNO. */
return mkdir (name);
#else
mode_t mode = 0;
if (modestr && *modestr)
{
modestr++;
if (*modestr && *modestr++ == 'r')
mode |= S_IRUSR;
if (*modestr && *modestr++ == 'w')
mode |= S_IWUSR;
if (*modestr && *modestr++ == 'x')
mode |= S_IXUSR;
if (*modestr && *modestr++ == 'r')
mode |= S_IRGRP;
if (*modestr && *modestr++ == 'w')
mode |= S_IWGRP;
if (*modestr && *modestr++ == 'x')
mode |= S_IXGRP;
if (*modestr && *modestr++ == 'r')
mode |= S_IROTH;
if (*modestr && *modestr++ == 'w')
mode |= S_IWOTH;
if (*modestr && *modestr++ == 'x')
mode |= S_IXOTH;
}
return mkdir (name, mode);
#endif
}
int
gnupg_setenv (const char *name, const char *value, int overwrite)
{
#ifdef HAVE_W32CE_SYSTEM
(void)name;
(void)value;
(void)overwrite;
return 0;
#else
return setenv (name, value, overwrite);
#endif
}
int
gnupg_unsetenv (const char *name)
{
#ifdef HAVE_W32CE_SYSTEM
(void)name;
return 0;
#else
# ifdef HAVE_UNSETENV
return unsetenv (name);
# else
return putenv (name);
# endif
#endif
}
#ifdef HAVE_W32CE_SYSTEM
/* There is a isatty function declaration in cegcc but it does not
make sense, thus we redefine it. */
int
_gnupg_isatty (int fd)
{
(void)fd;
return 0;
}
#endif
#ifdef HAVE_W32CE_SYSTEM
/* Replacement for getenv which takes care of the our use of getenv.
The code is not thread safe but we expect it to work in all cases
because it is called for the first time early enough. */
char *
_gnupg_getenv (const char *name)
{
static int initialized;
static char *assuan_debug;
if (!initialized)
{
assuan_debug = read_w32_registry_string (NULL,
"\\Software\\GNU\\libassuan",
"debug");
initialized = 1;
}
if (!strcmp (name, "ASSUAN_DEBUG"))
return assuan_debug;
else
return NULL;
}
#endif /*HAVE_W32CE_SYSTEM*/
|