1 | /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- |
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2 | * |
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3 | * Copyright (C) 2006 Ray Strode <rstrode@redhat.com> |
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4 | * Copyright (C) 2007 William Jon McCann <mccann@jhu.edu> |
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5 | * |
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6 | * This program is free software; you can redistribute it and/or modify |
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7 | * it under the terms of the GNU General Public License as published by |
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8 | * the Free Software Foundation; either version 2, or (at your option) |
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9 | * any later version. |
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10 | * |
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11 | * This program is distributed in the hope that it will be useful, |
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | * GNU General Public License for more details. |
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15 | * |
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16 | * You should have received a copy of the GNU General Public License |
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17 | * along with this program; if not, write to the Free Software |
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18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
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19 | * 02111-1307, USA. |
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20 | */ |
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21 | |
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22 | #include "config.h" |
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23 | |
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24 | #include <stdlib.h> |
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25 | #include <string.h> |
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26 | #include <unistd.h> |
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27 | |
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28 | #if defined(HAVE_UTMPX_H) |
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29 | #include <utmpx.h> |
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30 | #endif |
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31 | |
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32 | #if defined(HAVE_UTMP_H) |
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33 | #include <utmp.h> |
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34 | #endif |
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35 | |
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36 | #include <glib.h> |
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37 | #include <glib/gi18n.h> |
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38 | #include <glib/gstdio.h> |
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39 | |
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40 | #include "gdm-session-record.h" |
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41 | |
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42 | #ifndef GDM_BAD_SESSION_RECORDS_FILE |
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43 | #define GDM_BAD_SESSION_RECORDS_FILE "/var/log/btmp" |
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44 | #endif |
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45 | |
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46 | #if !defined(GDM_NEW_SESSION_RECORDS_FILE) |
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47 | # if defined(WTMPX_FILE) |
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48 | # define GDM_NEW_SESSION_RECORDS_FILE WTMPX_FILE |
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49 | # elif defined(_PATH_WTMPX) |
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50 | # define GDM_NEW_SESSION_RECORDS_FILE _PATH_WTMPX |
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51 | # elif defined(WTMPX_FILENAME) |
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52 | # define GDM_NEW_SESSION_RECORDS_FILE WTMPX_FILENAME |
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53 | # elif defined(WTMP_FILE) |
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54 | # define GDM_NEW_SESSION_RECORDS_FILE WTMP_FILE |
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55 | # elif defined(_PATH_WTMP) /* BSD systems */ |
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56 | # define GDM_NEW_SESSION_RECORDS_FILE _PATH_WTMP |
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57 | # else |
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58 | # define GDM_NEW_SESSION_RECORDS_FILE "/var/log/wtmp" |
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59 | # endif |
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60 | #endif |
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61 | |
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62 | static void |
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63 | record_set_username (UTMP *u, |
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64 | const char *user_name) |
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65 | { |
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66 | const char *username; |
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67 | |
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68 | /* |
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69 | * It is possible that PAM failed before it mapped the user |
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70 | * input into a valid username, so we fallback to try using |
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71 | * "(unknown)" |
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72 | */ |
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73 | if (user_name != NULL) { |
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74 | username = user_name; |
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75 | } else { |
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76 | username = "(unknown)"; |
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77 | } |
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78 | |
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79 | #if defined(HAVE_UT_UT_USER) |
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80 | strncpy (u->ut_user, |
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81 | username, |
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82 | sizeof (u->ut_user)); |
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83 | g_debug ("using ut_user %.*s", |
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84 | (int) sizeof (u->ut_user), |
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85 | u->ut_user); |
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86 | #elif defined(HAVE_UT_UT_NAME) |
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87 | strncpy (u->ut_name, |
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88 | username, |
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89 | sizeof (u->ut_name)); |
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90 | g_debug ("using ut_name %.*s", |
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91 | (int) sizeof (u->ut_name), |
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92 | u->ut_name); |
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93 | #endif |
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94 | } |
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95 | |
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96 | static void |
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97 | record_set_timestamp (UTMP *u) |
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98 | { |
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99 | #if defined(HAVE_UT_UT_TV) |
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100 | GTimeVal now = { 0 }; |
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101 | |
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102 | /* Set time in TV format */ |
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103 | g_get_current_time (&now); |
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104 | u->ut_tv.tv_sec = now.tv_sec; |
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105 | u->ut_tv.tv_usec = now.tv_usec; |
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106 | g_debug ("using ut_tv time %ld", |
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107 | (glong) u->ut_tv.tv_sec); |
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108 | #elif defined(HAVE_UT_UT_TIME) |
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109 | /* Set time in time format */ |
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110 | time (&u->ut_time); |
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111 | g_debug ("using ut_time %ld", |
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112 | (glong) u->ut_time); |
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113 | #endif |
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114 | } |
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115 | |
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116 | static void |
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117 | record_set_pid (UTMP *u, |
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118 | GPid pid) |
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119 | { |
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120 | #if defined(HAVE_UT_UT_PID) |
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121 | /* Set pid */ |
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122 | if (pid != 0) { |
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123 | u->ut_pid = pid; |
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124 | } |
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125 | g_debug ("using ut_pid %d", (int) u->ut_pid); |
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126 | #endif |
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127 | } |
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128 | |
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129 | static void |
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130 | record_set_id (UTMP *u, |
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131 | const char *id) |
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132 | { |
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133 | #if defined(HAVE_UT_UT_ID) |
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134 | strncpy (u->ut_id, id, sizeof (u->ut_id)); |
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135 | g_debug ("using ut_id %.*s", (int) sizeof (u->ut_id), u->ut_id); |
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136 | #endif |
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137 | } |
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138 | |
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139 | static void |
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140 | record_set_host (UTMP *u, |
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141 | const char *x11_display_name, |
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142 | const char *host_name) |
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143 | { |
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144 | char *hostname; |
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145 | |
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146 | #if defined(HAVE_UT_UT_HOST) |
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147 | hostname = NULL; |
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148 | |
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149 | /* |
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150 | * Set ut_host to hostname:$DISPLAY if remote, otherwise set |
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151 | * to $DISPLAY |
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152 | */ |
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153 | if (host_name != NULL |
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154 | && x11_display_name != NULL |
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155 | && g_str_has_prefix (x11_display_name, ":")) { |
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156 | hostname = g_strdup_printf ("%s%s", host_name, x11_display_name); |
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157 | } else { |
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158 | hostname = g_strdup (x11_display_name); |
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159 | } |
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160 | |
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161 | if (hostname != NULL) { |
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162 | strncpy (u->ut_host, hostname, sizeof (u->ut_host)); |
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163 | g_debug ("using ut_host %.*s", (int) sizeof (u->ut_host), u->ut_host); |
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164 | g_free (hostname); |
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165 | |
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166 | #ifdef HAVE_UT_UT_SYSLEN |
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167 | u->ut_syslen = MIN (strlen (hostname), sizeof (u->ut_host)); |
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168 | #endif |
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169 | } |
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170 | #endif |
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171 | } |
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172 | |
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173 | static void |
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174 | record_set_line (UTMP *u, |
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175 | const char *display_device, |
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176 | const char *x11_display_name) |
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177 | { |
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178 | /* |
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179 | * Set ut_line to the device name associated with this display |
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180 | * but remove the "/dev/" prefix. If no device, then use the |
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181 | * $DISPLAY value. |
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182 | */ |
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183 | if (display_device != NULL |
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184 | && g_str_has_prefix (display_device, "/dev/")) { |
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185 | strncpy (u->ut_line, |
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186 | display_device + strlen ("/dev/"), |
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187 | sizeof (u->ut_line)); |
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188 | } else if (x11_display_name != NULL |
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189 | && g_str_has_prefix (x11_display_name, ":")) { |
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190 | strncpy (u->ut_line, |
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191 | x11_display_name, |
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192 | sizeof (u->ut_line)); |
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193 | } |
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194 | |
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195 | g_debug ("using ut_line %.*s", (int) sizeof (u->ut_line), u->ut_line); |
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196 | } |
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197 | |
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198 | void |
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199 | gdm_session_record_login (GPid session_pid, |
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200 | const char *user_name, |
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201 | const char *host_name, |
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202 | const char *x11_display_name, |
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203 | const char *display_device) |
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204 | { |
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205 | UTMP session_record = { 0 }; |
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206 | UTMP *u; |
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207 | |
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208 | record_set_username (&session_record, user_name); |
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209 | |
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210 | g_debug ("Writing login record"); |
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211 | |
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212 | #if defined(HAVE_UT_UT_TYPE) |
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213 | session_record.ut_type = USER_PROCESS; |
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214 | g_debug ("using ut_type USER_PROCESS"); |
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215 | #endif |
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216 | |
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217 | record_set_timestamp (&session_record); |
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218 | record_set_pid (&session_record, session_pid); |
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219 | |
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220 | /* Set ut_id to the $DISPLAY value */ |
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221 | record_set_id (&session_record, x11_display_name); |
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222 | record_set_host (&session_record, x11_display_name, host_name); |
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223 | record_set_line (&session_record, display_device, x11_display_name); |
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224 | |
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225 | /* Handle wtmp */ |
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226 | g_debug ("Writing wtmp session record to " GDM_NEW_SESSION_RECORDS_FILE); |
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227 | #if defined(HAVE_UPDWTMPX) |
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228 | updwtmpx (GDM_NEW_SESSION_RECORDS_FILE, &session_record); |
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229 | #elif defined(HAVE_UPDWTMP) |
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230 | updwtmp (GDM_NEW_SESSION_RECORDS_FILE, &session_record); |
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231 | #elif defined(HAVE_LOGWTMP) && defined(HAVE_UT_UT_HOST) |
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232 | #if defined(HAVE_UT_UT_USER) |
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233 | logwtmp (session_record.ut_line, session_record.ut_user, session_record.ut_host); |
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234 | #elif defined(HAVE_UT_UT_NAME) |
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235 | logwtmp (session_record.ut_line, session_record.ut_name, session_record.ut_host); |
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236 | #endif |
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237 | #endif |
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238 | |
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239 | /* |
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240 | * Handle utmp |
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241 | * Update if entry already exists |
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242 | */ |
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243 | #if defined(HAVE_GETUTXENT) |
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244 | setutxent (); |
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245 | |
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246 | while ((u = getutxent ()) != NULL) { |
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247 | if (u->ut_type == USER_PROCESS && |
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248 | (session_record.ut_line != NULL && |
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249 | (strncmp (u->ut_line, session_record.ut_line, |
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250 | sizeof (u->ut_line)) == 0 || |
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251 | u->ut_pid == session_record.ut_pid))) { |
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252 | g_debug ("Updating existing utmp record"); |
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253 | pututxline (&session_record); |
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254 | break; |
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255 | } |
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256 | } |
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257 | endutxent (); |
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258 | |
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259 | /* Add new entry if update did not work */ |
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260 | if (u == NULL) { |
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261 | g_debug ("Adding new utmp record"); |
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262 | pututxline (&session_record); |
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263 | } |
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264 | #elif defined(HAVE_LOGIN) |
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265 | login (&session_record); |
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266 | #endif |
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267 | } |
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268 | |
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269 | void |
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270 | gdm_session_record_logout (GPid session_pid, |
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271 | const char *user_name, |
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272 | const char *host_name, |
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273 | const char *x11_display_name, |
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274 | const char *display_device) |
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275 | { |
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276 | UTMP session_record = { 0 }; |
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277 | UTMP *u; |
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278 | |
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279 | g_debug ("Writing logout record"); |
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280 | |
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281 | #if defined(HAVE_UT_UT_TYPE) |
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282 | session_record.ut_type = DEAD_PROCESS; |
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283 | g_debug ("using ut_type DEAD_PROCESS"); |
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284 | #endif |
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285 | |
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286 | record_set_timestamp (&session_record); |
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287 | record_set_pid (&session_record, session_pid); |
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288 | /* Set ut_id to the $DISPLAY value */ |
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289 | record_set_id (&session_record, x11_display_name); |
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290 | record_set_host (&session_record, x11_display_name, host_name); |
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291 | record_set_line (&session_record, display_device, x11_display_name); |
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292 | |
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293 | |
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294 | /* Handle wtmp */ |
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295 | g_debug ("Writing wtmp logout record to " GDM_NEW_SESSION_RECORDS_FILE); |
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296 | #if defined(HAVE_UPDWTMPX) |
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297 | updwtmpx (GDM_NEW_SESSION_RECORDS_FILE, &session_record); |
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298 | #elif defined (HAVE_UPDWTMP) |
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299 | updwtmp (GDM_NEW_SESSION_RECORDS_FILE, &session_record); |
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300 | #elif defined(HAVE_LOGWTMP) |
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301 | logwtmp (session_record.ut_line, "", ""); |
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302 | #endif |
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303 | |
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304 | /* Handle utmp */ |
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305 | #if defined(HAVE_GETUTXENT) |
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306 | setutxent (); |
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307 | |
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308 | while ((u = getutxent ()) != NULL && |
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309 | (u = getutxid (&session_record)) != NULL) { |
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310 | |
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311 | g_debug ("Removing utmp record"); |
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312 | if (u->ut_pid == session_pid && |
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313 | u->ut_type == DEAD_PROCESS) { |
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314 | /* Already done */ |
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315 | break; |
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316 | } |
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317 | |
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318 | u->ut_type = DEAD_PROCESS; |
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319 | #if defined(HAVE_UT_UT_TV) |
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320 | u->ut_tv.tv_sec = session_record.ut_tv.tv_sec; |
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321 | u->ut_tv.tv_usec = session_record.ut_tv.tv_usec; |
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322 | #elif defined(HAVE_UT_UT_TIME) |
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323 | u->ut_time = session_record.ut_time; |
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324 | #endif |
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325 | #ifdef HAVE_UT_UT_EXIT_E_TERMINATION |
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326 | u->ut_exit.e_termination = 0; |
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327 | u->ut_exit.e_exit = 0; |
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328 | #endif |
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329 | |
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330 | pututxline (u); |
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331 | |
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332 | break; |
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333 | } |
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334 | |
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335 | endutxent (); |
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336 | #elif defined(HAVE_LOGOUT) |
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337 | logout (session_record.ut_line); |
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338 | #endif |
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339 | } |
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340 | |
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341 | void |
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342 | gdm_session_record_failed (GPid session_pid, |
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343 | const char *user_name, |
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344 | const char *host_name, |
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345 | const char *x11_display_name, |
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346 | const char *display_device) |
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347 | { |
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348 | UTMP session_record = { 0 }; |
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349 | |
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350 | record_set_username (&session_record, user_name); |
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351 | |
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352 | g_debug ("Writing failed session attempt record"); |
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353 | |
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354 | #if defined(HAVE_UT_UT_TYPE) |
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355 | session_record.ut_type = USER_PROCESS; |
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356 | g_debug ("using ut_type USER_PROCESS"); |
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357 | #endif |
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358 | |
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359 | record_set_timestamp (&session_record); |
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360 | record_set_pid (&session_record, session_pid); |
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361 | /* Set ut_id to the $DISPLAY value */ |
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362 | record_set_id (&session_record, x11_display_name); |
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363 | record_set_host (&session_record, x11_display_name, host_name); |
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364 | record_set_line (&session_record, display_device, x11_display_name); |
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365 | |
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366 | /* Handle btmp */ |
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367 | g_debug ("Writing btmp failed session attempt record to " |
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368 | GDM_BAD_SESSION_RECORDS_FILE); |
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369 | |
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370 | #if defined(HAVE_UPDWTMPX) |
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371 | updwtmpx (GDM_BAD_SESSION_RECORDS_FILE, &session_record); |
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372 | #elif defined(HAVE_UPDWTMP) |
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373 | updwtmp(GDM_BAD_SESSION_RECORDS_FILE, &session_record); |
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374 | #endif |
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375 | |
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376 | } |
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