posix/tst-chmod.c

   1 /* Test for chmod functions.
   2    Copyright (C) 2000-2019 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <dirent.h>
  21 #include <errno.h>
  22 #include <error.h>
  23 #include <fcntl.h>
  24 #include <mcheck.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29 #include <sys/stat.h>
  30
  31
  32 #define OUT_OF_MEMORY \
  33   do {                                                                        \
  34     puts ("cannot allocate memory");                                          \
  35     result = 1;                                                               \
  36     goto fail;                                                                \
  37   } while (0)
  38
  39 static int
  40 do_test (int argc, char *argv[])
  41 {
  42   const char *builddir;
  43   struct stat64 st1;
  44   struct stat64 st2;
  45   char *buf;
  46   char *testdir;
  47   char *testfile = NULL;
  48   char *startdir;
  49   size_t buflen;
  50   int fd;
  51   int result = 0;
  52   DIR *dir;
  53
  54   mtrace ();
  55
  56   if (argc <= 1)
  57     error (EXIT_FAILURE, 0, "no parameters");
  58
  59   /* This is where we will create the test files.  */
  60   builddir = argv[1];
  61   buflen = strlen (builddir) + 50;
  62
  63   startdir = getcwd (NULL, 0);
  64   if (startdir == NULL)
  65     {
  66       printf ("cannot get current directory: %m\n");
  67       exit (EXIT_FAILURE);
  68     }
  69
  70   /* A buffer large enough for everything we need.  */
  71   buf = (char *) alloca (buflen);
  72
  73   /* Create the directory name.  */
  74   snprintf (buf, buflen, "%s/chmoddirXXXXXX", builddir);
  75
  76   if (mkdtemp (buf) == NULL)
  77     {
  78       printf ("cannot create test directory: %m\n");
  79       exit (EXIT_FAILURE);
  80     }
  81
  82   if (chmod ("", 0600) == 0)
  83     {
  84       puts ("chmod(\"\", 0600 didn't fail");
  85       result = 1;
  86     }
  87   else if (errno != ENOENT)
  88     {
  89       puts ("chmod(\"\",0600) does not set errno to ENOENT");
  90       result = 1;
  91     }
  92
  93   /* Create a duplicate.  */
  94   testdir = strdup (buf);
  95   if (testdir == NULL)
  96     OUT_OF_MEMORY;
  97
  98   if (stat64 (testdir, &st1) != 0)
  99     {
 100       printf ("cannot stat test directory: %m\n");
 101       exit (1);
 102     }
 103   if (!S_ISDIR (st1.st_mode))
 104     {
 105       printf ("file not created as directory: %m\n");
 106       exit (1);
 107     }
 108
 109   /* We have to wait for a second to make sure the ctime changes.  */
 110   sleep (1);
 111
 112   /* Remove all access rights from the directory.  */
 113   if (chmod (testdir, 0) != 0)
 114     {
 115       printf ("cannot change mode of test directory: %m\n");
 116       result = 1;
 117       goto fail;
 118     }
 119
 120   if (stat64 (testdir, &st2) != 0)
 121     {
 122       printf ("cannot stat test directory: %m\n");
 123       result = 1;
 124       goto fail;
 125     }
 126
 127   /* Compare result.  */
 128   if ((st2.st_mode & ALLPERMS) != 0)
 129     {
 130       printf ("chmod(...,0) on directory left bits nonzero: %o\n",
 131               st2.st_mode & ALLPERMS);
 132       result = 1;
 133     }
 134   if (st1.st_ctime >= st2.st_ctime)
 135     {
 136       puts ("chmod(...,0) did not set ctime correctly");
 137       result = 1;
 138     }
 139
 140   /* Name of a file in the directory.  */
 141   snprintf (buf, buflen, "%s/file", testdir);
 142   testfile = strdup (buf);
 143   if (testfile == NULL)
 144     OUT_OF_MEMORY;
 145
 146   fd = creat (testfile, 0);
 147   if (fd != -1)
 148     {
 149       if (getuid () != 0)
 150         {
 151           puts ("managed to create test file in protected directory");
 152           result = 1;
 153         }
 154       close (fd);
 155     }
 156   else if (errno != EACCES)
 157     {
 158       puts ("creat didn't generate correct errno value");
 159       result = 1;
 160     }
 161
 162   /* With this mode it still shouldn't be possible to create a file.  */
 163   if (chmod (testdir, 0600) != 0)
 164     {
 165       printf ("cannot change mode of test directory to 0600: %m\n");
 166       result = 1;
 167       goto fail;
 168     }
 169
 170   fd = creat (testfile, 0);
 171   if (fd != -1)
 172     {
 173       if (getuid () != 0)
 174         {
 175           puts ("managed to create test file in no-x protected directory");
 176           result = 1;
 177         }
 178       close (fd);
 179     }
 180   else if (errno != EACCES)
 181     {
 182       puts ("creat didn't generate correct errno value");
 183       result = 1;
 184     }
 185
 186   /* Change the directory mode back to allow creating a file.  This
 187      time with fchmod.  */
 188   dir = opendir (testdir);
 189   if (dir != NULL)
 190     {
 191       if (fchmod (dirfd (dir), 0700) != 0)
 192         {
 193           printf ("cannot change mode of test directory to 0700: %m\n");
 194           result = 1;
 195           closedir (dir);
 196           goto fail;
 197         }
 198
 199       closedir (dir);
 200     }
 201   else
 202     {
 203       printf ("cannot open directory: %m\n");
 204       result = 1;
 205
 206       if (chmod (testdir, 0700) != 0)
 207         {
 208           printf ("cannot change mode of test directory to 0700: %m\n");
 209           goto fail;
 210         }
 211     }
 212
 213   fd = creat (testfile, 0);
 214   if (fd == -1)
 215     {
 216       puts ("still didn't manage to create test file in protected directory");
 217       result = 1;
 218       goto fail;
 219     }
 220   if (fstat64 (fd, &st1) != 0)
 221     {
 222       printf ("cannot stat new file: %m\n");
 223       result = 1;
 224     }
 225   else if ((st1.st_mode & ALLPERMS) != 0)
 226     {
 227       puts ("file not created with access mode 0");
 228       result = 1;
 229     }
 230   close (fd);
 231
 232   snprintf (buf, buflen, "%s/..", testdir);
 233   chdir (buf);
 234   /* We are now in the directory above the one we create the test
 235      directory in.  */
 236
 237   sleep (1);
 238   snprintf (buf, buflen, "./%s/../%s/file",
 239             basename (testdir), basename (testdir));
 240   if (chmod (buf, 0600) != 0)
 241     {
 242       printf ("cannot change mode of file to 0600: %m\n");
 243       result = 1;
 244       goto fail;
 245     }
 246   snprintf (buf, buflen, "./%s//file", basename (testdir));
 247   if (stat64 (buf, &st2) != 0)
 248     {
 249       printf ("cannot stat new file: %m\n");
 250       result = 1;
 251     }
 252   else if ((st2.st_mode & ALLPERMS) != 0600)
 253     {
 254       puts ("file mode not changed to 0600");
 255       result = 1;
 256     }
 257   else if (st1.st_ctime >= st2.st_ctime)
 258     {
 259       puts ("chmod(\".../file\",0600) did not set ctime correctly");
 260       result = 1;
 261     }
 262
 263   if (chmod (buf, 0777 | S_ISUID | S_ISGID) != 0)
 264     {
 265       printf ("cannot change mode of file to %o: %m\n",
 266               0777 | S_ISUID | S_ISGID);
 267       result = 1;
 268     }
 269   if (stat64 (buf, &st2) != 0)
 270     {
 271       printf ("cannot stat test file: %m\n");
 272       result = 1;
 273     }
 274   else if ((st2.st_mode & ALLPERMS) != (0777 | S_ISUID | S_ISGID))
 275     {
 276       puts ("file mode not changed to 0777 | S_ISUID | S_ISGID");
 277       result = 1;
 278     }
 279
 280   if (chmod (basename (testdir), 0777 | S_ISUID | S_ISGID | S_ISVTX) != 0)
 281     {
 282       printf ("cannot change mode of test directory to %o: %m\n",
 283               0777 | S_ISUID | S_ISGID | S_ISVTX);
 284       result = 1;
 285     }
 286   if (stat64 (basename (testdir), &st2) != 0)
 287     {
 288       printf ("cannot stat test directory: %m\n");
 289       result = 1;
 290     }
 291   else if ((st2.st_mode & ALLPERMS) != (0777 | S_ISUID | S_ISGID | S_ISVTX))
 292     {
 293       puts ("directory mode not changed to 0777 | S_ISUID | S_ISGID | S_ISGID");
 294       result = 1;
 295     }
 296
 297   snprintf (buf, buflen, "./%s/no-such-file", basename (testdir));
 298   if (chmod (buf, 0600) != -1)
 299     {
 300       puts ("chmod(\".../no-such-file\",0600) did not fail");
 301       result = 1;
 302     }
 303   else if (errno != ENOENT)
 304     {
 305       puts ("chmod(\".../no-such-file\",0600) does not set errno to ENOENT");
 306       result = 1;
 307     }
 308
 309   snprintf (buf, buflen, "%s/", basename (testdir));
 310   if (chmod (basename (testdir), 0677) != 0)
 311     {
 312       printf ("cannot change mode of test directory to 0677: %m\n");
 313       result = 1;
 314     }
 315   else
 316     {
 317       snprintf (buf, buflen, "./%s/file", basename (testdir));
 318       if (chmod (buf, 0600) == 0)
 319         {
 320           if (getuid () != 0)
 321             {
 322               puts ("chmod(\".../file\") with no-exec directory succeeded");
 323               result = 1;
 324             }
 325         }
 326       else if (errno != EACCES)
 327         {
 328           puts ("chmod(\".../file\") with no-exec directory didn't set EACCES");
 329           result = 1;
 330         }
 331     }
 332
 333   if (chmod (basename (testdir), 0777) != 0)
 334     {
 335       printf ("cannot change mode of test directory to 0777: %m\n");
 336       result = 1;
 337       goto fail;
 338     }
 339
 340   snprintf (buf, buflen, "%s/file/cannot-be", basename (testdir));
 341   if (chmod (buf, 0600) == 0)
 342     {
 343       puts ("chmod(\".../file/cannot-be\",0600) did not fail");
 344       result = 1;
 345     }
 346   else if (errno != ENOTDIR)
 347     {
 348       puts ("chmod(\".../file/cannot-be\",0600) does not set errno to ENOTDIR");
 349       result = 1;
 350     }
 351
 352  fail:
 353   chdir (startdir);
 354
 355   /* Remove all the files.  */
 356   chmod (testdir, 0700);
 357   if (testfile != NULL)
 358     {
 359       chmod (testfile, 0700);
 360       unlink (testfile);
 361     }
 362   rmdir (testdir);
 363
 364   /* Free the resources.  */
 365   free (testfile);
 366   free (testdir);
 367   free (startdir);
 368
 369   return result;
 370 }
 371
 372 #include "../test-skeleton.c"