Mercurial > dovecot > core-2.2

annotate src/lib/eacces-error.c @ 8759:6ec819adfde3 HEAD

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Moved user-friendly EACCES error message generation to lib/.
author Timo Sirainen <tss@iki.fi>
date Fri, 20 Feb 2009 17:35:49 -0500
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children e22e36a61fdd
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rev   line source
8759
6ec819adfde3 Moved user-friendly EACCES error message generation to lib/.
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1 /* Copyright (c) 2007-2009 Dovecot authors, see the included COPYING file */
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2
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3 #include "lib.h"
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4 #include "str.h"
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5 #include "eacces-error.h"
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6
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7 #include <sys/stat.h>
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8 #include <unistd.h>
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9 #include <pwd.h>
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10 #include <grp.h>
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11
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12 static const char *
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13 eacces_error_get_full(const char *func, const char *path, bool creating)
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14 {
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15 const char *prev_path = path, *dir = "/", *p;
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16 const struct passwd *pw;
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17 const struct group *group;
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18 string_t *errmsg;
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19 struct stat st;
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20 int ret = -1;
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21
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22 errmsg = t_str_new(256);
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23 str_printfa(errmsg, "%s(%s) failed: Permission denied (euid=%s",
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24 func, path, dec2str(geteuid()));
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25
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26 pw = getpwuid(geteuid());
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27 if (pw != NULL)
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28 str_printfa(errmsg, "(%s)", pw->pw_name);
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29
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30 str_printfa(errmsg, " egid=%s", dec2str(getegid()));
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31 group = getgrgid(getegid());
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32 if (group != NULL)
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33 str_printfa(errmsg, "(%s)", group->gr_name);
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34
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35 while ((p = strrchr(prev_path, '/')) != NULL) {
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36 dir = t_strdup_until(prev_path, p);
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37 ret = stat(dir, &st);
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38 if (ret == 0)
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39 break;
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40 if (errno == EACCES) {
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41 /* see if we have access to parent directory */
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42 } else if (errno == ENOENT && creating) {
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43 /* probably mkdir_parents() failed here, find the first
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44 parent directory we couldn't create */
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45 } else {
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46 /* some other error, can't handle it */
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47 str_printfa(errmsg, " stat(%s) failed: %m", dir);
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48 break;
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49 }
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50 prev_path = dir;
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51 dir = "/";
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52 }
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53
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54 if (ret == 0) {
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55 /* dir is the first parent directory we can stat() */
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56 if (access(dir, X_OK) < 0) {
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57 if (errno == EACCES)
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58 str_printfa(errmsg, " missing +x perm: %s", dir);
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59 else
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60 str_printfa(errmsg, " access(%s, x) failed: %m", dir);
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61 } else if (creating && access(dir, W_OK) < 0) {
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62 if (errno == EACCES)
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63 str_printfa(errmsg, " missing +w perm: %s", dir);
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64 else
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65 str_printfa(errmsg, " access(%s, w) failed: %m", dir);
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66 } else if (prev_path == path && access(path, R_OK) < 0) {
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67 if (errno == EACCES)
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68 str_printfa(errmsg, " missing +r perm: %s", path);
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69 else
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70 str_printfa(errmsg, " access(%s, r) failed: %m", path);
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71 } else
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72 str_printfa(errmsg, " UNIX perms seem ok, ACL problem?");
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73 }
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74 str_append_c(errmsg, ')');
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75 return str_c(errmsg);
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76 }
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77
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78 const char *eacces_error_get(const char *func, const char *path)
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79 {
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80 return eacces_error_get_full(func, path, FALSE);
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81 }
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82
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83 const char *eacces_error_get_creating(const char *func, const char *path)
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84 {
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85 return eacces_error_get_full(func, path, TRUE);
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86 }