Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib/safe-mkdir.c @ 1329:ae229b7acb4c HEAD

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author Timo Sirainen <tss@iki.fi>
date Wed, 02 Apr 2003 05:05:38 +0300
parents 500ec0ec3b85
children 9df02b1533b3
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1 /*
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2 Copyright (c) 2002 Timo Sirainen
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3
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4 Permission is hereby granted, free of charge, to any person obtaining
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5 a copy of this software and associated documentation files (the
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6 "Software"), to deal in the Software without restriction, including
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7 without limitation the rights to use, copy, modify, merge, publish,
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8 distribute, sublicense, and/or sell copies of the Software, and to
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9 permit persons to whom the Software is furnished to do so, subject to
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10 the following conditions:
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11
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12 The above copyright notice and this permission notice shall be
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13 included in all copies or substantial portions of the Software.
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14
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15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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16 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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17 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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18 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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19 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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20 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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21 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 */
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23
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24 #include "lib.h"
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25 #include "safe-mkdir.h"
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26
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27 #include <sys/stat.h>
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28 #include <unistd.h>
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29 #include <fcntl.h>
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30
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31 int safe_mkdir(const char *dir, mode_t mode, uid_t uid, gid_t gid)
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32 {
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33 struct stat st;
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34 int fd, ret = 1;
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35
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36 if (lstat(dir, &st) < 0) {
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37 if (errno != ENOENT)
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38 i_fatal("lstat() failed for %s: %m", dir);
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39
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40 if (mkdir(dir, mode) < 0)
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41 i_fatal("Can't create directory %s: %m", dir);
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42 } else {
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43 /* already exists. */
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44 ret = 2;
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45 }
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46
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47 /* use fchown() and fchmod() just to make sure we aren't following
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48 symbolic links. */
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49 fd = open(dir, O_RDONLY);
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50 if (fd == -1)
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51 i_fatal("open() failed for %s: %m", dir);
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52
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53 if (fstat(fd, &st) < 0)
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54 i_fatal("fstat() failed for %s: %m", dir);
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55
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56 if (!S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode))
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57 i_fatal("Not a directory %s", dir);
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58
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59 if (st.st_uid != uid || st.st_gid != gid) {
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60 if (fchown(fd, uid, gid) < 0)
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61 i_fatal("fchown() failed for %s: %m", dir);
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62 ret = 0;
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63 }
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64
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65 if ((st.st_mode & 07777) != mode) {
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66 if (fchmod(fd, mode) < 0)
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67 i_fatal("chmod() failed for %s: %m", dir);
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68 ret = 0;
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69 }
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70
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71 if (close(fd) < 0)
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72 i_fatal("close() failed for %s: %m", dir);
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73
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74 /* make sure we succeeded in everything. chown() and chmod()
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75 are racy: user owned 0777 file - change either and the user
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76 can still change it back. */
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77 if (lstat(dir, &st) < 0)
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78 i_fatal("lstat() check failed for %s: %m", dir);
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79
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80 if (!S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode))
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81 i_fatal("Not a directory %s", dir);
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82
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83 if ((st.st_mode & 07777) != mode) {
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84 i_fatal("safe_mkdir() failed: %s (%o) is still not mode %o",
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85 dir, (int)st.st_mode, (int)mode);
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86 }
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87 if (st.st_uid != uid || st.st_gid != gid) {
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88 i_fatal("safe_mkdir() failed: %s (%s, %s) "
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89 "is still not owned by %s.%s",
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90 dir, dec2str(st.st_uid), dec2str(st.st_gid),
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91 dec2str(uid), dec2str(gid));
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92 }
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93
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94 return ret;
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95 }