Mercurial > dovecot > core-2.2
annotate src/lib/eacces-error.c @ 9501:e22e36a61fdd HEAD
eacces_error_get*() works now properly when process's real uid != effective uid.
author | Timo Sirainen <tss@iki.fi> |
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date | Sun, 21 Jun 2009 23:31:46 -0400 |
parents | 6ec819adfde3 |
children | 8760bc0b1c3a |
rev | line source |
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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 "restrict-access.h" |
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6 #include "eacces-error.h" |
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7 |
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8 #include <sys/stat.h> |
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9 #include <unistd.h> |
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10 #include <pwd.h> |
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11 #include <grp.h> |
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12 |
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13 static bool is_in_group(gid_t gid) |
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14 { |
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15 const gid_t *gids; |
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16 unsigned int i, count; |
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17 |
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18 if (getegid() == gid) |
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19 return TRUE; |
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20 |
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21 gids = restrict_get_groups_list(&count); |
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22 for (i = 0; i < count; i++) { |
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23 if (gids[i] == gid) |
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24 return TRUE; |
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25 } |
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26 return FALSE; |
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27 } |
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28 |
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29 static int test_access(const char *path, int mode, string_t *errmsg) |
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30 { |
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31 struct stat st; |
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32 |
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33 if (getuid() == geteuid()) { |
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34 if (access(path, mode) == 0) |
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35 return 0; |
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36 |
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37 if (errno != EACCES) { |
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38 str_printfa(errmsg, " access(%s, %d) failed: %m", |
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39 path, mode); |
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40 } |
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41 return -1; |
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42 } |
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43 |
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44 /* access() uses real uid, not effective uid. |
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45 we'll have to do these checks manually. */ |
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46 switch (mode) { |
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47 case X_OK: |
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48 if (stat(t_strconcat(path, "/test", NULL), &st) == 0) |
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49 return 0; |
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50 if (errno == ENOENT || errno == ENOTDIR) |
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51 return 0; |
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52 if (errno != EACCES) |
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53 str_printfa(errmsg, " stat(%s/test) failed: %m", path); |
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54 return -1; |
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55 case R_OK: |
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56 mode = 04; |
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57 break; |
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58 case W_OK: |
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59 mode = 02; |
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60 break; |
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61 default: |
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62 i_unreached(); |
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63 } |
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64 |
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65 if (stat(path, &st) < 0) { |
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66 str_printfa(errmsg, " stat(%s) failed: %m", path); |
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67 return -1; |
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68 } |
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69 |
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70 if (st.st_uid == geteuid()) |
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71 st.st_mode = (st.st_mode & 0700) >> 6; |
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72 else if (is_in_group(st.st_gid)) |
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73 st.st_mode = (st.st_mode & 0070) >> 3; |
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74 else |
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75 st.st_mode = (st.st_mode & 0007); |
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76 |
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77 if ((st.st_mode & mode) != 0) |
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78 return 0; |
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79 errno = EACCES; |
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80 return -1; |
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81 } |
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82 |
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83 static const char * |
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84 eacces_error_get_full(const char *func, const char *path, bool creating) |
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85 { |
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86 const char *prev_path = path, *dir = "/", *p; |
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87 const struct passwd *pw; |
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88 const struct group *group; |
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89 string_t *errmsg; |
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90 struct stat st, dir_st; |
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91 int ret = -1; |
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92 |
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93 errmsg = t_str_new(256); |
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94 str_printfa(errmsg, "%s(%s) failed: Permission denied (euid=%s", |
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95 func, path, dec2str(geteuid())); |
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96 |
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97 pw = getpwuid(geteuid()); |
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98 if (pw != NULL) |
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99 str_printfa(errmsg, "(%s)", pw->pw_name); |
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100 |
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101 str_printfa(errmsg, " egid=%s", dec2str(getegid())); |
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102 group = getgrgid(getegid()); |
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103 if (group != NULL) |
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104 str_printfa(errmsg, "(%s)", group->gr_name); |
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105 |
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106 while ((p = strrchr(prev_path, '/')) != NULL) { |
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107 dir = t_strdup_until(prev_path, p); |
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108 ret = stat(dir, &st); |
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109 if (ret == 0) |
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110 break; |
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111 if (errno == EACCES) { |
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112 /* see if we have access to parent directory */ |
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113 } else if (errno == ENOENT && creating) { |
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114 /* probably mkdir_parents() failed here, find the first |
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115 parent directory we couldn't create */ |
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116 } else { |
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117 /* some other error, can't handle it */ |
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118 str_printfa(errmsg, " stat(%s) failed: %m", dir); |
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119 break; |
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120 } |
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121 prev_path = dir; |
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122 dir = "/"; |
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123 dir_st = st; |
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124 } |
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125 |
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126 if (ret == 0) { |
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127 /* dir is the first parent directory we can stat() */ |
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128 if (test_access(dir, X_OK, errmsg) < 0) { |
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129 if (errno == EACCES) |
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130 str_printfa(errmsg, " missing +x perm: %s", dir); |
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131 } else if (creating && test_access(dir, W_OK, errmsg) < 0) { |
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132 if (errno == EACCES) |
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133 str_printfa(errmsg, " missing +w perm: %s", dir); |
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134 } else if (prev_path == path && |
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135 test_access(path, R_OK, errmsg) < 0) { |
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136 if (errno == EACCES) |
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137 str_printfa(errmsg, " missing +r perm: %s", path); |
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138 } else |
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139 str_printfa(errmsg, " UNIX perms seem ok, ACL problem?"); |
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140 } |
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141 str_append_c(errmsg, ')'); |
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142 return str_c(errmsg); |
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143 } |
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144 |
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145 const char *eacces_error_get(const char *func, const char *path) |
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146 { |
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147 return eacces_error_get_full(func, path, FALSE); |
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148 } |
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149 |
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150 const char *eacces_error_get_creating(const char *func, const char *path) |
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151 { |
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152 return eacces_error_get_full(func, path, TRUE); |
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153 } |