1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * addgroup - add groups to /etc/group and /etc/gshadow
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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 or later, see file LICENSE in this source tree.
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10 | *
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11 | */
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12 |
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13 | //usage:#define addgroup_trivial_usage
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14 | //usage: "[-g GID] " IF_FEATURE_ADDUSER_TO_GROUP("[USER] ") "GROUP"
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15 | //usage:#define addgroup_full_usage "\n\n"
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16 | //usage: "Add a group " IF_FEATURE_ADDUSER_TO_GROUP("or add a user to a group") "\n"
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17 | //usage: "\n -g GID Group id"
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18 | //usage: "\n -S Create a system group"
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19 |
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20 | #include "libbb.h"
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21 |
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22 | #if CONFIG_LAST_SYSTEM_ID < CONFIG_FIRST_SYSTEM_ID
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23 | #error Bad LAST_SYSTEM_ID or FIRST_SYSTEM_ID in .config
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24 | #endif
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25 |
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26 | #define OPT_GID (1 << 0)
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27 | #define OPT_SYSTEM_ACCOUNT (1 << 1)
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28 |
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29 | /* We assume GID_T_MAX == INT_MAX */
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30 | static void xgroup_study(struct group *g)
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31 | {
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32 | unsigned max = INT_MAX;
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33 |
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34 | /* Make sure gr_name is unused */
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35 | if (getgrnam(g->gr_name)) {
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36 | bb_error_msg_and_die("%s '%s' in use", "group", g->gr_name);
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37 | /* these format strings are reused in adduser and addgroup */
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38 | }
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39 |
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40 | /* if a specific gid is requested, the --system switch and */
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41 | /* min and max values are overridden, and the range of valid */
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42 | /* gid values is set to [0, INT_MAX] */
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43 | if (!(option_mask32 & OPT_GID)) {
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44 | if (option_mask32 & OPT_SYSTEM_ACCOUNT) {
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45 | g->gr_gid = CONFIG_FIRST_SYSTEM_ID;
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46 | max = CONFIG_LAST_SYSTEM_ID;
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47 | } else {
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48 | g->gr_gid = CONFIG_LAST_SYSTEM_ID + 1;
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49 | max = 64999;
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50 | }
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51 | }
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52 | /* Check if the desired gid is free
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53 | * or find the first free one */
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54 | while (1) {
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55 | if (!getgrgid(g->gr_gid)) {
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56 | return; /* found free group: return */
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57 | }
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58 | if (option_mask32 & OPT_GID) {
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59 | /* -g N, cannot pick gid other than N: error */
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60 | bb_error_msg_and_die("%s '%s' in use", "gid", itoa(g->gr_gid));
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61 | /* this format strings is reused in adduser and addgroup */
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62 | }
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63 | if (g->gr_gid == max) {
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64 | /* overflowed: error */
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65 | bb_error_msg_and_die("no %cids left", 'g');
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66 | /* this format string is reused in adduser and addgroup */
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67 | }
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68 | g->gr_gid++;
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69 | }
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70 | }
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71 |
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72 | /* append a new user to the passwd file */
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73 | static void new_group(char *group, gid_t gid)
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74 | {
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75 | struct group gr;
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76 | char *p;
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77 |
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78 | /* make sure gid and group haven't already been allocated */
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79 | gr.gr_gid = gid;
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80 | gr.gr_name = group;
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81 | xgroup_study(&gr);
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82 |
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83 | /* add entry to group */
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84 | p = xasprintf("x:%u:", (unsigned) gr.gr_gid);
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85 | if (update_passwd(bb_path_group_file, group, p, NULL) < 0)
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86 | exit(EXIT_FAILURE);
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87 | if (ENABLE_FEATURE_CLEAN_UP)
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88 | free(p);
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89 | #if ENABLE_FEATURE_SHADOWPASSWDS
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90 | /* /etc/gshadow fields:
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91 | * 1. Group name.
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92 | * 2. Encrypted password.
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93 | * If set, non-members of the group can join the group
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94 | * by typing the password for that group using the newgrp command.
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95 | * If the value is of this field ! then no user is allowed
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96 | * to access the group using the newgrp command. A value of !!
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97 | * is treated the same as a value of ! only it indicates
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98 | * that a password has never been set before. If the value is null,
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99 | * only group members can log into the group.
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100 | * 3. Group administrators (comma delimited list).
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101 | * Group members listed here can add or remove group members
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102 | * using the gpasswd command.
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103 | * 4. Group members (comma delimited list).
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104 | */
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105 | /* Ignore errors: if file is missing we assume admin doesn't want it */
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106 | update_passwd(bb_path_gshadow_file, group, "!::", NULL);
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107 | #endif
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108 | }
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109 |
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110 | #if ENABLE_FEATURE_ADDGROUP_LONG_OPTIONS
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111 | static const char addgroup_longopts[] ALIGN1 =
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112 | "gid\0" Required_argument "g"
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113 | "system\0" No_argument "S"
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114 | ;
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115 | #endif
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116 |
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117 | /*
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118 | * addgroup will take a login_name as its first parameter.
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119 | *
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120 | * gid can be customized via command-line parameters.
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121 | * If called with two non-option arguments, addgroup
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122 | * will add an existing user to an existing group.
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123 | */
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124 | int addgroup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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125 | int addgroup_main(int argc UNUSED_PARAM, char **argv)
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126 | {
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127 | unsigned opts;
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128 | unsigned gid = 0;
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129 |
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130 | /* need to be root */
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131 | if (geteuid()) {
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132 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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133 | }
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134 | #if ENABLE_FEATURE_ADDGROUP_LONG_OPTIONS
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135 | applet_long_options = addgroup_longopts;
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136 | #endif
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137 | /* Syntax:
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138 | * addgroup group
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139 | * addgroup -g num group
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140 | * addgroup user group
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141 | * Check for min, max and missing args */
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142 | opt_complementary = "-1:?2:g+";
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143 | opts = getopt32(argv, "g:S", &gid);
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144 | /* move past the commandline options */
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145 | argv += optind;
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146 | //argc -= optind;
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147 |
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148 | #if ENABLE_FEATURE_ADDUSER_TO_GROUP
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149 | if (argv[1]) {
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150 | struct group *gr;
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151 |
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152 | if (opts & OPT_GID) {
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153 | /* -g was there, but "addgroup -g num user group"
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154 | * is a no-no */
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155 | bb_show_usage();
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156 | }
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157 |
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158 | /* check if group and user exist */
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159 | xuname2uid(argv[0]); /* unknown user: exit */
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160 | gr = xgetgrnam(argv[1]); /* unknown group: exit */
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161 | /* check if user is already in this group */
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162 | for (; *(gr->gr_mem) != NULL; (gr->gr_mem)++) {
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163 | if (!strcmp(argv[0], *(gr->gr_mem))) {
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164 | /* user is already in group: do nothing */
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165 | return EXIT_SUCCESS;
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166 | }
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167 | }
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168 | if (update_passwd(bb_path_group_file, argv[1], NULL, argv[0]) < 0) {
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169 | return EXIT_FAILURE;
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170 | }
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171 | # if ENABLE_FEATURE_SHADOWPASSWDS
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172 | update_passwd(bb_path_gshadow_file, argv[1], NULL, argv[0]);
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173 | # endif
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174 | } else
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175 | #endif /* ENABLE_FEATURE_ADDUSER_TO_GROUP */
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176 | {
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177 | die_if_bad_username(argv[0]);
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178 | new_group(argv[0], gid);
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179 | }
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180 | /* Reached only on success */
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181 | return EXIT_SUCCESS;
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182 | }
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