1 | /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- |
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2 | * |
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3 | * gdm-display-access-file.c - Abstraction around xauth cookies |
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4 | * |
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5 | * Copyright (C) 2007 Ray Strode <rstrode@redhat.com> |
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6 | * |
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7 | * This program is free software; you can redistribute it and/or modify |
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8 | * it under the terms of the GNU General Public License as published by |
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9 | * the Free Software Foundation; either version 2, or (at your option) |
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10 | * any later version. |
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11 | * |
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12 | * This program is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | * GNU General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU General Public License |
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18 | * along with this program; if not, write to the Free Software |
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19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
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20 | * 02111-1307, USA. |
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21 | */ |
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22 | |
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23 | #include "config.h" |
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24 | |
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25 | #include <errno.h> |
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26 | #include <limits.h> |
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27 | #include <pwd.h> |
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28 | #include <string.h> |
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29 | #include <sys/types.h> |
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30 | #include <unistd.h> |
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31 | #include <sys/stat.h> |
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32 | #include <fcntl.h> |
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33 | |
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34 | #include <glib.h> |
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35 | #include <glib-object.h> |
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36 | #include <glib/gstdio.h> |
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37 | #include <glib/gi18n.h> |
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38 | |
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39 | #include <X11/Xauth.h> |
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40 | |
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41 | #include "gdm-display-access-file.h" |
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42 | #include "gdm-common.h" |
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43 | |
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44 | struct _GdmDisplayAccessFilePrivate |
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45 | { |
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46 | char *username; |
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47 | FILE *fp; |
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48 | char *path; |
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49 | }; |
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50 | |
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51 | #ifndef GDM_DISPLAY_ACCESS_COOKIE_SIZE |
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52 | #define GDM_DISPLAY_ACCESS_COOKIE_SIZE 16 |
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53 | #endif |
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54 | |
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55 | #ifndef O_BINARY |
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56 | #define O_BINARY 0 |
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57 | #endif |
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58 | |
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59 | static void gdm_display_access_file_finalize (GObject * object); |
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60 | |
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61 | enum |
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62 | { |
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63 | PROP_0 = 0, |
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64 | PROP_USERNAME, |
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65 | PROP_PATH |
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66 | }; |
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67 | |
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68 | G_DEFINE_TYPE (GdmDisplayAccessFile, gdm_display_access_file, G_TYPE_OBJECT) |
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69 | |
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70 | static void |
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71 | gdm_display_access_file_get_property (GObject *object, |
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72 | guint prop_id, |
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73 | GValue *value, |
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74 | GParamSpec *pspec) |
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75 | { |
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76 | GdmDisplayAccessFile *access_file; |
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77 | |
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78 | access_file = GDM_DISPLAY_ACCESS_FILE (object); |
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79 | |
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80 | switch (prop_id) { |
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81 | case PROP_USERNAME: |
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82 | g_value_set_string (value, access_file->priv->username); |
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83 | break; |
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84 | |
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85 | case PROP_PATH: |
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86 | g_value_set_string (value, access_file->priv->path); |
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87 | break; |
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88 | |
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89 | default: |
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90 | G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
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91 | } |
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92 | } |
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93 | |
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94 | static void |
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95 | gdm_display_access_file_set_property (GObject *object, |
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96 | guint prop_id, |
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97 | const GValue *value, |
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98 | GParamSpec *pspec) |
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99 | { |
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100 | GdmDisplayAccessFile *access_file; |
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101 | |
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102 | access_file = GDM_DISPLAY_ACCESS_FILE (object); |
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103 | |
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104 | switch (prop_id) { |
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105 | case PROP_USERNAME: |
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106 | g_assert (access_file->priv->username == NULL); |
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107 | access_file->priv->username = g_value_dup_string (value); |
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108 | break; |
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109 | |
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110 | default: |
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111 | G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
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112 | } |
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113 | } |
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114 | |
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115 | static void |
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116 | gdm_display_access_file_class_init (GdmDisplayAccessFileClass *access_file_class) |
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117 | { |
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118 | GObjectClass *object_class; |
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119 | GParamSpec *param_spec; |
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120 | |
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121 | object_class = G_OBJECT_CLASS (access_file_class); |
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122 | |
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123 | object_class->finalize = gdm_display_access_file_finalize; |
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124 | object_class->get_property = gdm_display_access_file_get_property; |
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125 | object_class->set_property = gdm_display_access_file_set_property; |
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126 | |
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127 | param_spec = g_param_spec_string ("username", |
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128 | "Username", |
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129 | "Owner of Xauthority file", |
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130 | NULL, |
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131 | G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY); |
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132 | g_object_class_install_property (object_class, PROP_USERNAME, param_spec); |
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133 | param_spec = g_param_spec_string ("path", |
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134 | "Path", |
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135 | "Path to Xauthority file", |
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136 | NULL, |
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137 | G_PARAM_READABLE); |
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138 | g_object_class_install_property (object_class, PROP_PATH, param_spec); |
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139 | g_type_class_add_private (access_file_class, sizeof (GdmDisplayAccessFilePrivate)); |
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140 | } |
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141 | |
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142 | static void |
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143 | gdm_display_access_file_init (GdmDisplayAccessFile *access_file) |
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144 | { |
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145 | access_file->priv = G_TYPE_INSTANCE_GET_PRIVATE (access_file, |
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146 | GDM_TYPE_DISPLAY_ACCESS_FILE, |
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147 | GdmDisplayAccessFilePrivate); |
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148 | } |
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149 | |
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150 | static void |
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151 | gdm_display_access_file_finalize (GObject *object) |
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152 | { |
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153 | GdmDisplayAccessFile *file; |
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154 | GObjectClass *parent_class; |
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155 | |
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156 | file = GDM_DISPLAY_ACCESS_FILE (object); |
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157 | parent_class = G_OBJECT_CLASS (gdm_display_access_file_parent_class); |
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158 | |
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159 | if (file->priv->fp != NULL) { |
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160 | gdm_display_access_file_close (file); |
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161 | } |
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162 | g_assert (file->priv->path == NULL); |
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163 | |
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164 | if (file->priv->username != NULL) { |
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165 | g_free (file->priv->username); |
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166 | file->priv->username = NULL; |
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167 | g_object_notify (object, "username"); |
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168 | } |
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169 | |
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170 | if (parent_class->finalize != NULL) { |
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171 | parent_class->finalize (object); |
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172 | } |
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173 | } |
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174 | |
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175 | GQuark |
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176 | gdm_display_access_file_error_quark (void) |
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177 | { |
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178 | static GQuark error_quark = 0; |
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179 | |
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180 | if (error_quark == 0) { |
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181 | error_quark = g_quark_from_static_string ("gdm-display-access-file"); |
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182 | } |
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183 | |
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184 | return error_quark; |
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185 | } |
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186 | |
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187 | GdmDisplayAccessFile * |
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188 | gdm_display_access_file_new (const char *username) |
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189 | { |
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190 | GdmDisplayAccessFile *access_file; |
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191 | g_return_val_if_fail (username != NULL, NULL); |
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192 | |
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193 | access_file = g_object_new (GDM_TYPE_DISPLAY_ACCESS_FILE, |
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194 | "username", username, |
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195 | NULL); |
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196 | |
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197 | return access_file; |
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198 | } |
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199 | |
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200 | static gboolean |
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201 | _get_uid_and_gid_for_user (const char *username, |
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202 | uid_t *uid, |
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203 | gid_t *gid) |
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204 | { |
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205 | struct passwd *passwd_entry; |
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206 | |
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207 | g_assert (username != NULL); |
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208 | g_assert (uid != NULL); |
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209 | g_assert (gid != NULL); |
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210 | |
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211 | errno = 0; |
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212 | passwd_entry = getpwnam (username); |
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213 | |
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214 | if (passwd_entry == NULL) { |
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215 | return FALSE; |
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216 | } |
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217 | |
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218 | *uid = passwd_entry->pw_uid; |
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219 | *gid = passwd_entry->pw_gid; |
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220 | |
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221 | return TRUE; |
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222 | } |
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223 | |
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224 | static void |
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225 | clean_up_stale_auth_subdirs (void) |
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226 | { |
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227 | GDir *dir; |
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228 | const char *filename; |
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229 | |
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230 | dir = g_dir_open (GDM_XAUTH_DIR, 0, NULL); |
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231 | |
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232 | if (dir == NULL) { |
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233 | return; |
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234 | } |
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235 | |
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236 | while ((filename = g_dir_read_name (dir)) != NULL) { |
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237 | char *path; |
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238 | |
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239 | path = g_build_filename (GDM_XAUTH_DIR, filename, NULL); |
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240 | |
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241 | /* Will only succeed if the directory is empty |
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242 | */ |
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243 | g_rmdir (path); |
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244 | g_free (path); |
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245 | } |
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246 | g_dir_close (dir); |
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247 | } |
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248 | |
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249 | static FILE * |
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250 | _create_xauth_file_for_user (const char *username, |
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251 | char **filename, |
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252 | GError **error) |
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253 | { |
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254 | char *template; |
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255 | const char *dir_name; |
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256 | char *auth_filename; |
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257 | int fd; |
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258 | FILE *fp; |
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259 | uid_t uid; |
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260 | gid_t gid; |
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261 | |
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262 | g_assert (filename != NULL); |
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263 | |
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264 | *filename = NULL; |
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265 | |
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266 | template = NULL; |
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267 | auth_filename = NULL; |
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268 | fp = NULL; |
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269 | fd = -1; |
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270 | |
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271 | /* Create directory if not exist, then set permission 01775 and ownership root:gdm */ |
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272 | if (g_file_test (GDM_XAUTH_DIR, G_FILE_TEST_IS_DIR) == FALSE) { |
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273 | g_unlink (GDM_XAUTH_DIR); |
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274 | if (g_mkdir (GDM_XAUTH_DIR, S_ISVTX | S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH) != 0) { |
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275 | g_set_error (error, |
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276 | G_FILE_ERROR, |
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277 | g_file_error_from_errno (errno), |
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278 | "%s", g_strerror (errno)); |
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279 | goto out; |
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280 | } |
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281 | |
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282 | g_chmod (GDM_XAUTH_DIR, S_ISVTX | S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH); |
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283 | _get_uid_and_gid_for_user (GDM_USERNAME, &uid, &gid); |
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284 | if (chown (GDM_XAUTH_DIR, 0, gid) != 0) { |
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285 | g_warning ("Unable to change owner of '%s'", |
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286 | GDM_XAUTH_DIR); |
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287 | } |
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288 | } else { |
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289 | /* if it does exist make sure it has correct mode 01775 */ |
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290 | g_chmod (GDM_XAUTH_DIR, S_ISVTX | S_IRWXU |S_IRWXG | S_IROTH | S_IXOTH); |
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291 | |
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292 | /* and clean up any stale auth subdirs */ |
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293 | clean_up_stale_auth_subdirs (); |
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294 | } |
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295 | |
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296 | if (!_get_uid_and_gid_for_user (username, &uid, &gid)) { |
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297 | g_set_error (error, |
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298 | GDM_DISPLAY_ERROR, |
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299 | GDM_DISPLAY_ERROR_GETTING_USER_INFO, |
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300 | _("could not find user \"%s\" on system"), |
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301 | username); |
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302 | goto out; |
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303 | |
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304 | } |
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305 | |
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306 | template = g_strdup_printf (GDM_XAUTH_DIR |
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307 | "/auth-for-%s-XXXXXX", |
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308 | username); |
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309 | |
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310 | g_debug ("GdmDisplayAccessFile: creating xauth directory %s", template); |
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311 | /* Initially create with mode 01700 then later chmod after we create database */ |
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312 | errno = 0; |
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313 | dir_name = gdm_make_temp_dir (template); |
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314 | if (dir_name == NULL) { |
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315 | g_set_error (error, |
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316 | G_FILE_ERROR, |
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317 | g_file_error_from_errno (errno), |
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318 | "Unable to create temp dir from tempalte '%s': %s", |
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319 | template, |
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320 | g_strerror (errno)); |
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321 | goto out; |
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322 | } |
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323 | |
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324 | g_debug ("GdmDisplayAccessFile: chowning %s to %u:%u", |
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325 | dir_name, (guint)uid, (guint)gid); |
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326 | errno = 0; |
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327 | if (chown (dir_name, uid, gid) < 0) { |
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328 | g_set_error (error, |
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329 | G_FILE_ERROR, |
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330 | g_file_error_from_errno (errno), |
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331 | "Unable to change permission of '%s': %s", |
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332 | dir_name, |
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333 | g_strerror (errno)); |
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334 | goto out; |
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335 | } |
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336 | |
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337 | auth_filename = g_build_filename (dir_name, "database", NULL); |
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338 | |
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339 | g_debug ("GdmDisplayAccessFile: creating %s", auth_filename); |
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340 | /* mode 00600 */ |
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341 | errno = 0; |
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342 | fd = g_open (auth_filename, |
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343 | O_RDWR | O_CREAT | O_EXCL | O_BINARY, |
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344 | S_IRUSR | S_IWUSR); |
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345 | |
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346 | if (fd < 0) { |
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347 | g_set_error (error, |
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348 | G_FILE_ERROR, |
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349 | g_file_error_from_errno (errno), |
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350 | "Unable to open '%s': %s", |
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351 | auth_filename, |
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352 | g_strerror (errno)); |
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353 | goto out; |
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354 | } |
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355 | |
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356 | g_debug ("GdmDisplayAccessFile: chowning %s to %u:%u", auth_filename, (guint)uid, (guint)gid); |
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357 | errno = 0; |
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358 | if (fchown (fd, uid, gid) < 0) { |
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359 | g_set_error (error, |
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360 | G_FILE_ERROR, |
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361 | g_file_error_from_errno (errno), |
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362 | "Unable to change owner for '%s': %s", |
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363 | auth_filename, |
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364 | g_strerror (errno)); |
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365 | close (fd); |
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366 | fd = -1; |
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367 | goto out; |
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368 | } |
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369 | |
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370 | /* now open up permissions on per-session directory */ |
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371 | g_debug ("GdmDisplayAccessFile: chmoding %s to 1777", dir_name); |
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372 | g_chmod (dir_name, S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO); |
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373 | |
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374 | errno = 0; |
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375 | fp = fdopen (fd, "w"); |
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376 | if (fp == NULL) { |
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377 | g_set_error (error, |
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378 | G_FILE_ERROR, |
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379 | g_file_error_from_errno (errno), |
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380 | "%s", g_strerror (errno)); |
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381 | close (fd); |
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382 | fd = -1; |
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383 | goto out; |
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384 | } |
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385 | |
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386 | *filename = auth_filename; |
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387 | auth_filename = NULL; |
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388 | |
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389 | /* don't close it */ |
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390 | fd = -1; |
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391 | out: |
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392 | g_free (template); |
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393 | g_free (auth_filename); |
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394 | if (fd != -1) { |
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395 | close (fd); |
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396 | } |
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397 | |
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398 | return fp; |
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399 | } |
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400 | |
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401 | gboolean |
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402 | gdm_display_access_file_open (GdmDisplayAccessFile *file, |
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403 | GError **error) |
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404 | { |
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405 | GError *create_error; |
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406 | |
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407 | g_return_val_if_fail (file != NULL, FALSE); |
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408 | g_return_val_if_fail (file->priv->fp == NULL, FALSE); |
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409 | g_return_val_if_fail (file->priv->path == NULL, FALSE); |
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410 | |
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411 | create_error = NULL; |
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412 | file->priv->fp = _create_xauth_file_for_user (file->priv->username, |
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413 | &file->priv->path, |
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414 | &create_error); |
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415 | |
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416 | if (file->priv->fp == NULL) { |
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417 | g_propagate_error (error, create_error); |
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418 | return FALSE; |
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419 | } |
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420 | |
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421 | return TRUE; |
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422 | } |
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423 | |
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424 | static void |
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425 | _get_auth_info_for_display (GdmDisplayAccessFile *file, |
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426 | GdmDisplay *display, |
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427 | unsigned short *family, |
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428 | unsigned short *address_length, |
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429 | char **address, |
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430 | unsigned short *number_length, |
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431 | char **number, |
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432 | unsigned short *name_length, |
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433 | char **name) |
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434 | { |
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435 | int display_number; |
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436 | gboolean is_local; |
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437 | |
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438 | gdm_display_is_local (display, &is_local, NULL); |
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439 | |
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440 | if (is_local) { |
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441 | char localhost[HOST_NAME_MAX + 1] = ""; |
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442 | *family = FamilyLocal; |
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443 | if (gethostname (localhost, HOST_NAME_MAX) == 0) { |
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444 | *address = g_strdup (localhost); |
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445 | } else { |
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446 | *address = g_strdup ("localhost"); |
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447 | } |
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448 | } else { |
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449 | *family = FamilyWild; |
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450 | gdm_display_get_remote_hostname (display, address, NULL); |
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451 | } |
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452 | *address_length = strlen (*address); |
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453 | |
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454 | gdm_display_get_x11_display_number (display, &display_number, NULL); |
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455 | *number = g_strdup_printf ("%d", display_number); |
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456 | *number_length = strlen (*number); |
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457 | |
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458 | *name = g_strdup ("MIT-MAGIC-COOKIE-1"); |
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459 | *name_length = strlen (*name); |
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460 | } |
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461 | |
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462 | gboolean |
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463 | gdm_display_access_file_add_display (GdmDisplayAccessFile *file, |
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464 | GdmDisplay *display, |
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465 | char **cookie, |
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466 | gsize *cookie_size, |
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467 | GError **error) |
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468 | { |
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469 | GError *add_error; |
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470 | gboolean display_added; |
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471 | |
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472 | g_return_val_if_fail (file != NULL, FALSE); |
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473 | g_return_val_if_fail (file->priv->path != NULL, FALSE); |
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474 | g_return_val_if_fail (cookie != NULL, FALSE); |
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475 | |
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476 | add_error = NULL; |
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477 | *cookie = gdm_generate_random_bytes (GDM_DISPLAY_ACCESS_COOKIE_SIZE, |
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478 | &add_error); |
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479 | |
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480 | if (*cookie == NULL) { |
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481 | g_propagate_error (error, add_error); |
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482 | return FALSE; |
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483 | } |
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484 | |
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485 | *cookie_size = GDM_DISPLAY_ACCESS_COOKIE_SIZE; |
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486 | |
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487 | display_added = gdm_display_access_file_add_display_with_cookie (file, display, |
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488 | *cookie, |
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489 | *cookie_size, |
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490 | &add_error); |
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491 | if (!display_added) { |
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492 | g_free (*cookie); |
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493 | *cookie = NULL; |
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494 | g_propagate_error (error, add_error); |
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495 | return FALSE; |
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496 | } |
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497 | |
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498 | return TRUE; |
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499 | } |
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500 | |
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501 | gboolean |
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502 | gdm_display_access_file_add_display_with_cookie (GdmDisplayAccessFile *file, |
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503 | GdmDisplay *display, |
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504 | const char *cookie, |
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505 | gsize cookie_size, |
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506 | GError **error) |
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507 | { |
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508 | Xauth auth_entry; |
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509 | gboolean display_added; |
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510 | |
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511 | g_return_val_if_fail (file != NULL, FALSE); |
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512 | g_return_val_if_fail (file->priv->path != NULL, FALSE); |
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513 | g_return_val_if_fail (cookie != NULL, FALSE); |
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514 | |
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515 | _get_auth_info_for_display (file, display, |
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516 | &auth_entry.family, |
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517 | &auth_entry.address_length, |
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518 | &auth_entry.address, |
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519 | &auth_entry.number_length, |
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520 | &auth_entry.number, |
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521 | &auth_entry.name_length, |
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522 | &auth_entry.name); |
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523 | |
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524 | auth_entry.data = (char *) cookie; |
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525 | auth_entry.data_length = cookie_size; |
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526 | |
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527 | /* FIXME: We should lock the file in case the X server is |
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528 | * trying to use it, too. |
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529 | */ |
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530 | if (!XauWriteAuth (file->priv->fp, &auth_entry) |
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531 | || fflush (file->priv->fp) == EOF) { |
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532 | g_set_error (error, |
---|
533 | G_FILE_ERROR, |
---|
534 | g_file_error_from_errno (errno), |
---|
535 | "%s", g_strerror (errno)); |
---|
536 | display_added = FALSE; |
---|
537 | } else { |
---|
538 | display_added = TRUE; |
---|
539 | } |
---|
540 | |
---|
541 | |
---|
542 | g_free (auth_entry.address); |
---|
543 | g_free (auth_entry.number); |
---|
544 | g_free (auth_entry.name); |
---|
545 | |
---|
546 | return display_added; |
---|
547 | } |
---|
548 | |
---|
549 | gboolean |
---|
550 | gdm_display_access_file_remove_display (GdmDisplayAccessFile *file, |
---|
551 | GdmDisplay *display, |
---|
552 | GError **error) |
---|
553 | { |
---|
554 | Xauth *auth_entry; |
---|
555 | unsigned short family; |
---|
556 | unsigned short address_length; |
---|
557 | char *address; |
---|
558 | unsigned short number_length; |
---|
559 | char *number; |
---|
560 | unsigned short name_length; |
---|
561 | char *name; |
---|
562 | |
---|
563 | |
---|
564 | g_return_val_if_fail (file != NULL, FALSE); |
---|
565 | g_return_val_if_fail (file->priv->path != NULL, FALSE); |
---|
566 | |
---|
567 | _get_auth_info_for_display (file, display, |
---|
568 | &family, |
---|
569 | &address_length, |
---|
570 | &address, |
---|
571 | &number_length, |
---|
572 | &number, |
---|
573 | &name_length, |
---|
574 | &name); |
---|
575 | |
---|
576 | auth_entry = XauGetAuthByAddr (family, |
---|
577 | address_length, |
---|
578 | address, |
---|
579 | number_length, |
---|
580 | number, |
---|
581 | name_length, |
---|
582 | name); |
---|
583 | g_free (address); |
---|
584 | g_free (number); |
---|
585 | g_free (name); |
---|
586 | |
---|
587 | if (auth_entry == NULL) { |
---|
588 | g_set_error (error, |
---|
589 | GDM_DISPLAY_ACCESS_FILE_ERROR, |
---|
590 | GDM_DISPLAY_ACCESS_FILE_ERROR_FINDING_AUTH_ENTRY, |
---|
591 | "could not find authorization entry"); |
---|
592 | return FALSE; |
---|
593 | } |
---|
594 | |
---|
595 | XauDisposeAuth (auth_entry); |
---|
596 | |
---|
597 | if (fflush (file->priv->fp) == EOF) { |
---|
598 | g_set_error (error, |
---|
599 | G_FILE_ERROR, |
---|
600 | g_file_error_from_errno (errno), |
---|
601 | "%s", g_strerror (errno)); |
---|
602 | return FALSE; |
---|
603 | } |
---|
604 | |
---|
605 | return TRUE; |
---|
606 | } |
---|
607 | |
---|
608 | void |
---|
609 | gdm_display_access_file_close (GdmDisplayAccessFile *file) |
---|
610 | { |
---|
611 | char *auth_dir; |
---|
612 | |
---|
613 | g_return_if_fail (file != NULL); |
---|
614 | g_return_if_fail (file->priv->fp != NULL); |
---|
615 | g_return_if_fail (file->priv->path != NULL); |
---|
616 | |
---|
617 | errno = 0; |
---|
618 | if (g_unlink (file->priv->path) != 0) { |
---|
619 | g_warning ("GdmDisplayAccessFile: Unable to remove X11 authority database '%s': %s", |
---|
620 | file->priv->path, |
---|
621 | g_strerror (errno)); |
---|
622 | } |
---|
623 | |
---|
624 | /* still try to remove dir even if file remove failed, |
---|
625 | may have already been removed by someone else */ |
---|
626 | /* we own the parent directory too */ |
---|
627 | auth_dir = g_path_get_dirname (file->priv->path); |
---|
628 | if (auth_dir != NULL) { |
---|
629 | errno = 0; |
---|
630 | if (g_rmdir (auth_dir) != 0) { |
---|
631 | g_warning ("GdmDisplayAccessFile: Unable to remove X11 authority directory '%s': %s", |
---|
632 | auth_dir, |
---|
633 | g_strerror (errno)); |
---|
634 | } |
---|
635 | g_free (auth_dir); |
---|
636 | } |
---|
637 | |
---|
638 | g_free (file->priv->path); |
---|
639 | file->priv->path = NULL; |
---|
640 | g_object_notify (G_OBJECT (file), "path"); |
---|
641 | |
---|
642 | fclose (file->priv->fp); |
---|
643 | file->priv->fp = NULL; |
---|
644 | } |
---|
645 | |
---|
646 | char * |
---|
647 | gdm_display_access_file_get_path (GdmDisplayAccessFile *access_file) |
---|
648 | { |
---|
649 | return g_strdup (access_file->priv->path); |
---|
650 | } |
---|