1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * deluser/delgroup implementation for busybox
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4 | *
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5 | * Copyright (C) 1999 by Lineo, inc. and John Beppu
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6 | * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
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7 | * Copyright (C) 2007 by Tito Ragusa <farmatito@tiscali.it>
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8 | *
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9 | * Licensed under GPLv2, see file LICENSE in this source tree.
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10 | */
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11 | //config:config DELUSER
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12 | //config: bool "deluser"
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13 | //config: default y
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14 | //config: help
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15 | //config: Utility for deleting a user account.
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16 | //config:
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17 | //config:config DELGROUP
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18 | //config: bool "delgroup"
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19 | //config: default y
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20 | //config: help
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21 | //config: Utility for deleting a group account.
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22 | //config:
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23 | //config:config FEATURE_DEL_USER_FROM_GROUP
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24 | //config: bool "Support for removing users from groups"
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25 | //config: default y
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26 | //config: depends on DELGROUP
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27 | //config: help
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28 | //config: If called with two non-option arguments, deluser
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29 | //config: or delgroup will remove an user from a specified group.
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30 |
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31 | //applet:IF_DELUSER(APPLET(deluser, BB_DIR_USR_SBIN, BB_SUID_DROP))
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32 | //applet:IF_DELGROUP(APPLET_ODDNAME(delgroup, deluser, BB_DIR_USR_SBIN, BB_SUID_DROP, delgroup))
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33 |
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34 | //kbuild:lib-$(CONFIG_DELUSER) += deluser.o
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35 | //kbuild:lib-$(CONFIG_DELGROUP) += deluser.o
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36 |
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37 | //usage:#define deluser_trivial_usage
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38 | //usage: IF_LONG_OPTS("[--remove-home] ") "USER"
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39 | //usage:#define deluser_full_usage "\n\n"
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40 | //usage: "Delete USER from the system"
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41 | // --remove-home is self-explanatory enough to put it in --help
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42 |
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43 | //usage:#define delgroup_trivial_usage
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44 | //usage: IF_FEATURE_DEL_USER_FROM_GROUP("[USER] ")"GROUP"
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45 | //usage:#define delgroup_full_usage "\n\n"
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46 | //usage: "Delete group GROUP from the system"
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47 | //usage: IF_FEATURE_DEL_USER_FROM_GROUP(" or user USER from group GROUP")
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48 |
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49 | #include "libbb.h"
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50 |
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51 | int deluser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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52 | int deluser_main(int argc, char **argv)
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53 | {
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54 | /* User or group name */
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55 | char *name;
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56 | /* Username (non-NULL only in "delgroup USER GROUP" case) */
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57 | char *member;
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58 | /* Name of passwd or group file */
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59 | const char *pfile;
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60 | /* Name of shadow or gshadow file */
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61 | const char *sfile;
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62 | /* Are we deluser or delgroup? */
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63 | int do_deluser = (ENABLE_DELUSER && (!ENABLE_DELGROUP || applet_name[3] == 'u'));
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64 |
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65 | #if !ENABLE_LONG_OPTS
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66 | const int opt_delhome = 0;
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67 | #else
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68 | int opt_delhome = 0;
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69 | if (do_deluser) {
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70 | applet_long_options =
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71 | "remove-home\0" No_argument "\xff";
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72 | opt_delhome = getopt32(argv, "");
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73 | argv += opt_delhome;
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74 | argc -= opt_delhome;
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75 | }
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76 | #endif
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77 |
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78 | if (geteuid() != 0)
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79 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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80 |
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81 | name = argv[1];
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82 | member = NULL;
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83 |
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84 | switch (argc) {
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85 | case 3:
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86 | if (!ENABLE_FEATURE_DEL_USER_FROM_GROUP || do_deluser)
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87 | break;
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88 | /* It's "delgroup USER GROUP" */
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89 | member = name;
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90 | name = argv[2];
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91 | /* Fallthrough */
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92 |
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93 | case 2:
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94 | if (do_deluser) {
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95 | /* "deluser USER" */
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96 | struct passwd *pw;
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97 |
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98 | pw = xgetpwnam(name); /* bail out if USER is wrong */
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99 | pfile = bb_path_passwd_file;
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100 | if (ENABLE_FEATURE_SHADOWPASSWDS)
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101 | sfile = bb_path_shadow_file;
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102 | if (opt_delhome)
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103 | remove_file(pw->pw_dir, FILEUTILS_RECUR);
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104 | } else {
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105 | struct group *gr;
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106 | do_delgroup:
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107 | /* "delgroup GROUP" or "delgroup USER GROUP" */
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108 | if (do_deluser < 0) { /* delgroup after deluser? */
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109 | gr = getgrnam(name);
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110 | if (!gr)
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111 | return EXIT_SUCCESS;
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112 | } else {
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113 | gr = xgetgrnam(name); /* bail out if GROUP is wrong */
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114 | }
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115 | if (!member) {
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116 | /* "delgroup GROUP" */
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117 | struct passwd *pw;
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118 | /* Check if the group is in use */
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119 | while ((pw = getpwent()) != NULL) {
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120 | if (pw->pw_gid == gr->gr_gid)
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121 | bb_error_msg_and_die("'%s' still has '%s' as their primary group!",
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122 | pw->pw_name, name);
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123 | }
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124 | //endpwent();
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125 | }
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126 | pfile = bb_path_group_file;
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127 | if (ENABLE_FEATURE_SHADOWPASSWDS)
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128 | sfile = bb_path_gshadow_file;
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129 | }
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130 |
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131 | /* Modify pfile, then sfile */
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132 | do {
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133 | if (update_passwd(pfile, name, NULL, member) == -1)
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134 | return EXIT_FAILURE;
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135 | if (ENABLE_FEATURE_SHADOWPASSWDS) {
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136 | pfile = sfile;
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137 | sfile = NULL;
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138 | }
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139 | } while (ENABLE_FEATURE_SHADOWPASSWDS && pfile);
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140 |
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141 | if (do_deluser > 0) {
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142 | /* Delete user from all groups */
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143 | if (update_passwd(bb_path_group_file, NULL, NULL, name) == -1)
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144 | return EXIT_FAILURE;
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145 |
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146 | if (ENABLE_DELGROUP) {
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147 | /* "deluser USER" also should try to delete
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148 | * same-named group. IOW: do "delgroup USER"
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149 | */
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150 | // On debian deluser is a perl script that calls userdel.
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151 | // From man userdel:
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152 | // If USERGROUPS_ENAB is defined to yes in /etc/login.defs, userdel will
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153 | // delete the group with the same name as the user.
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154 | do_deluser = -1;
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155 | goto do_delgroup;
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156 | }
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157 | }
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158 | return EXIT_SUCCESS;
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159 | }
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160 | /* Reached only if number of command line args is wrong */
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161 | bb_show_usage();
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162 | }
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