1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * adduser - add users to /etc/passwd and /etc/shadow
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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 | *
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8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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9 | */
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10 | //config:config ADDUSER
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11 | //config: bool "adduser"
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12 | //config: default y
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13 | //config: help
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14 | //config: Utility for creating a new user account.
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15 | //config:
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16 | //config:config FEATURE_ADDUSER_LONG_OPTIONS
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17 | //config: bool "Enable long options"
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18 | //config: default y
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19 | //config: depends on ADDUSER && LONG_OPTS
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20 | //config: help
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21 | //config: Support long options for the adduser applet.
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22 | //config:
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23 | //config:config FEATURE_CHECK_NAMES
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24 | //config: bool "Enable sanity check on user/group names in adduser and addgroup"
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25 | //config: default n
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26 | //config: depends on ADDUSER || ADDGROUP
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27 | //config: help
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28 | //config: Enable sanity check on user and group names in adduser and addgroup.
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29 | //config: To avoid problems, the user or group name should consist only of
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30 | //config: letters, digits, underscores, periods, at signs and dashes,
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31 | //config: and not start with a dash (as defined by IEEE Std 1003.1-2001).
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32 | //config: For compatibility with Samba machine accounts "$" is also supported
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33 | //config: at the end of the user or group name.
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34 | //config:
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35 | //config:config LAST_ID
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36 | //config: int "Last valid uid or gid for adduser and addgroup"
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37 | //config: depends on ADDUSER || ADDGROUP
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38 | //config: default 60000
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39 | //config: help
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40 | //config: Last valid uid or gid for adduser and addgroup
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41 | //config:
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42 | //config:config FIRST_SYSTEM_ID
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43 | //config: int "First valid system uid or gid for adduser and addgroup"
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44 | //config: depends on ADDUSER || ADDGROUP
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45 | //config: range 0 LAST_ID
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46 | //config: default 100
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47 | //config: help
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48 | //config: First valid system uid or gid for adduser and addgroup
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49 | //config:
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50 | //config:config LAST_SYSTEM_ID
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51 | //config: int "Last valid system uid or gid for adduser and addgroup"
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52 | //config: depends on ADDUSER || ADDGROUP
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53 | //config: range FIRST_SYSTEM_ID LAST_ID
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54 | //config: default 999
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55 | //config: help
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56 | //config: Last valid system uid or gid for adduser and addgroup
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57 |
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58 | //applet:IF_ADDUSER(APPLET(adduser, BB_DIR_USR_SBIN, BB_SUID_DROP))
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59 |
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60 | //kbuild:lib-$(CONFIG_ADDUSER) += adduser.o
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61 |
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62 | //usage:#define adduser_trivial_usage
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63 | //usage: "[OPTIONS] USER [GROUP]"
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64 | //usage:#define adduser_full_usage "\n\n"
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65 | //usage: "Create new user, or add USER to GROUP\n"
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66 | //usage: "\n -h DIR Home directory"
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67 | //usage: "\n -g GECOS GECOS field"
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68 | //usage: "\n -s SHELL Login shell"
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69 | //usage: "\n -G GRP Add user to existing group"
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70 | //usage: "\n -S Create a system user"
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71 | //usage: "\n -D Don't assign a password"
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72 | //usage: "\n -H Don't create home directory"
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73 | //usage: "\n -u UID User id"
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74 | //usage: "\n -k SKEL Skeleton directory (/etc/skel)"
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75 |
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76 | #include "libbb.h"
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77 |
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78 | #if CONFIG_LAST_SYSTEM_ID < CONFIG_FIRST_SYSTEM_ID
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79 | #error Bad LAST_SYSTEM_ID or FIRST_SYSTEM_ID in .config
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80 | #endif
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81 | #if CONFIG_LAST_ID < CONFIG_LAST_SYSTEM_ID
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82 | #error Bad LAST_ID or LAST_SYSTEM_ID in .config
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83 | #endif
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84 |
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85 |
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86 | /* #define OPT_HOME (1 << 0) */ /* unused */
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87 | /* #define OPT_GECOS (1 << 1) */ /* unused */
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88 | #define OPT_SHELL (1 << 2)
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89 | #define OPT_GID (1 << 3)
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90 | #define OPT_DONT_SET_PASS (1 << 4)
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91 | #define OPT_SYSTEM_ACCOUNT (1 << 5)
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92 | #define OPT_DONT_MAKE_HOME (1 << 6)
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93 | #define OPT_UID (1 << 7)
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94 | #define OPT_SKEL (1 << 8)
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95 |
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96 | /* remix */
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97 | /* recoded such that the uid may be passed in *p */
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98 | static void passwd_study(struct passwd *p)
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99 | {
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100 | int max = CONFIG_LAST_ID;
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101 |
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102 | if (getpwnam(p->pw_name)) {
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103 | bb_error_msg_and_die("%s '%s' in use", "user", p->pw_name);
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104 | /* this format string is reused in adduser and addgroup */
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105 | }
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106 |
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107 | if (!(option_mask32 & OPT_UID)) {
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108 | if (option_mask32 & OPT_SYSTEM_ACCOUNT) {
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109 | p->pw_uid = CONFIG_FIRST_SYSTEM_ID;
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110 | max = CONFIG_LAST_SYSTEM_ID;
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111 | } else {
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112 | p->pw_uid = CONFIG_LAST_SYSTEM_ID + 1;
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113 | }
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114 | }
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115 | /* check for a free uid (and maybe gid) */
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116 | while (getpwuid(p->pw_uid) || (p->pw_gid == (gid_t)-1 && getgrgid(p->pw_uid))) {
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117 | if (option_mask32 & OPT_UID) {
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118 | /* -u N, cannot pick uid other than N: error */
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119 | bb_error_msg_and_die("%s '%s' in use", "uid", itoa(p->pw_uid));
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120 | /* this format string is reused in adduser and addgroup */
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121 | }
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122 | if (p->pw_uid == max) {
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123 | bb_error_msg_and_die("no %cids left", 'u');
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124 | /* this format string is reused in adduser and addgroup */
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125 | }
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126 | p->pw_uid++;
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127 | }
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128 |
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129 | if (p->pw_gid == (gid_t)-1) {
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130 | p->pw_gid = p->pw_uid; /* new gid = uid */
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131 | if (getgrnam(p->pw_name)) {
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132 | bb_error_msg_and_die("%s '%s' in use", "group", p->pw_name);
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133 | /* this format string is reused in adduser and addgroup */
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134 | }
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135 | }
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136 | }
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137 |
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138 | static int addgroup_wrapper(struct passwd *p, const char *group_name)
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139 | {
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140 | char *argv[6];
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141 |
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142 | argv[0] = (char*)"addgroup";
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143 | if (group_name) {
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144 | /* Add user to existing group */
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145 | argv[1] = (char*)"--";
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146 | argv[2] = p->pw_name;
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147 | argv[3] = (char*)group_name;
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148 | argv[4] = NULL;
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149 | } else {
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150 | /* Add user to his own group with the first free gid
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151 | * found in passwd_study.
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152 | */
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153 | #if ENABLE_FEATURE_ADDGROUP_LONG_OPTIONS || !ENABLE_ADDGROUP
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154 | /* We try to use --gid, not -g, because "standard" addgroup
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155 | * has no short option -g, it has only long --gid.
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156 | */
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157 | argv[1] = (char*)"--gid";
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158 | #else
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159 | /* Breaks if system in fact does NOT use busybox addgroup */
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160 | argv[1] = (char*)"-g";
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161 | #endif
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162 | argv[2] = utoa(p->pw_gid);
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163 | argv[3] = (char*)"--";
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164 | argv[4] = p->pw_name;
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165 | argv[5] = NULL;
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166 | }
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167 |
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168 | return spawn_and_wait(argv);
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169 | }
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170 |
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171 | static void passwd_wrapper(const char *login_name) NORETURN;
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172 |
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173 | static void passwd_wrapper(const char *login_name)
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174 | {
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175 | BB_EXECLP("passwd", "passwd", "--", login_name, NULL);
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176 | bb_error_msg_and_die("can't execute passwd, you must set password manually");
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177 | }
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178 |
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179 | #if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS
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180 | static const char adduser_longopts[] ALIGN1 =
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181 | "home\0" Required_argument "h"
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182 | "gecos\0" Required_argument "g"
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183 | "shell\0" Required_argument "s"
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184 | "ingroup\0" Required_argument "G"
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185 | "disabled-password\0" No_argument "D"
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186 | "empty-password\0" No_argument "D"
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187 | "system\0" No_argument "S"
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188 | "no-create-home\0" No_argument "H"
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189 | "uid\0" Required_argument "u"
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190 | "skel\0" Required_argument "k"
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191 | ;
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192 | #endif
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193 |
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194 | /*
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195 | * adduser will take a login_name as its first parameter.
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196 | * home, shell, gecos:
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197 | * can be customized via command-line parameters.
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198 | */
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199 | int adduser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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200 | int adduser_main(int argc UNUSED_PARAM, char **argv)
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201 | {
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202 | struct passwd pw;
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203 | const char *usegroup = NULL;
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204 | char *p;
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205 | unsigned opts;
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206 | char *uid;
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207 | const char *skel = "/etc/skel";
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208 |
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209 | #if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS
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210 | applet_long_options = adduser_longopts;
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211 | #endif
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212 |
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213 | /* got root? */
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214 | if (geteuid()) {
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215 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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216 | }
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217 |
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218 | pw.pw_gecos = (char *)"Linux User,,,";
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219 | /* We assume that newly created users "inherit" root's shell setting */
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220 | pw.pw_shell = (char *)get_shell_name();
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221 | pw.pw_dir = NULL;
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222 |
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223 | /* at least one and at most two non-option args */
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224 | /* disable interactive passwd for system accounts */
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225 | opt_complementary = "-1:?2:SD";
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226 | opts = getopt32(argv, "h:g:s:G:DSHu:k:", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup, &uid, &skel);
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227 | if (opts & OPT_UID)
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228 | pw.pw_uid = xatou_range(uid, 0, CONFIG_LAST_ID);
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229 |
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230 | argv += optind;
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231 | pw.pw_name = argv[0];
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232 |
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233 | if (!opts && argv[1]) {
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234 | /* if called with two non-option arguments, adduser
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235 | * will add an existing user to an existing group.
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236 | */
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237 | return addgroup_wrapper(&pw, argv[1]);
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238 | }
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239 |
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240 | /* fill in the passwd struct */
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241 | die_if_bad_username(pw.pw_name);
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242 | if (!pw.pw_dir) {
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243 | /* create string for $HOME if not specified already */
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244 | pw.pw_dir = xasprintf("/home/%s", argv[0]);
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245 | }
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246 | pw.pw_passwd = (char *)"x";
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247 | if (opts & OPT_SYSTEM_ACCOUNT) {
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248 | if (!usegroup) {
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249 | usegroup = "nogroup";
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250 | }
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251 | if (!(opts & OPT_SHELL)) {
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252 | pw.pw_shell = (char *) "/bin/false";
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253 | }
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254 | }
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255 | pw.pw_gid = usegroup ? xgroup2gid(usegroup) : -1; /* exits on failure */
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256 |
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257 | /* make sure everything is kosher and setup uid && maybe gid */
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258 | passwd_study(&pw);
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259 |
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260 | p = xasprintf("x:%u:%u:%s:%s:%s",
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261 | (unsigned) pw.pw_uid, (unsigned) pw.pw_gid,
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262 | pw.pw_gecos, pw.pw_dir, pw.pw_shell);
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263 | if (update_passwd(bb_path_passwd_file, pw.pw_name, p, NULL) < 0) {
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264 | return EXIT_FAILURE;
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265 | }
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266 | if (ENABLE_FEATURE_CLEAN_UP)
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267 | free(p);
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268 | #if ENABLE_FEATURE_SHADOWPASSWDS
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269 | /* /etc/shadow fields:
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270 | * 1. username
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271 | * 2. encrypted password
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272 | * 3. last password change (unix date (unix time/24*60*60))
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273 | * 4. minimum days required between password changes
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274 | * 5. maximum days password is valid
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275 | * 6. days before password is to expire that user is warned
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276 | * 7. days after password expires that account is disabled
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277 | * 8. unix date when login expires (i.e. when it may no longer be used)
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278 | */
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279 | /* fields: 2 3 4 5 6 78 */
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280 | p = xasprintf("!:%u:0:99999:7:::", (unsigned)(time(NULL)) / (24*60*60));
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281 | /* ignore errors: if file is missing we suppose admin doesn't want it */
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282 | update_passwd(bb_path_shadow_file, pw.pw_name, p, NULL);
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283 | if (ENABLE_FEATURE_CLEAN_UP)
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284 | free(p);
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285 | #endif
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286 |
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287 | /* add to group */
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288 | addgroup_wrapper(&pw, usegroup);
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289 |
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290 | /* clear the umask for this process so it doesn't
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291 | * screw up the permissions on the mkdir and chown. */
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292 | umask(0);
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293 | if (!(opts & OPT_DONT_MAKE_HOME)) {
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294 | /* set the owner and group so it is owned by the new user,
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295 | * then fix up the permissions to 2755. Can't do it before
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296 | * since chown will clear the setgid bit */
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297 | int mkdir_err = mkdir(pw.pw_dir, 0755);
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298 | if (mkdir_err == 0) {
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299 | /* New home. Copy /etc/skel to it */
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300 | const char *args[] = {
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301 | "chown",
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302 | "-R",
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303 | xasprintf("%u:%u", (int)pw.pw_uid, (int)pw.pw_gid),
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304 | pw.pw_dir,
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305 | NULL
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306 | };
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307 | /* Be silent on any errors (like: no /etc/skel) */
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308 | if (!(opts & OPT_SKEL))
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309 | logmode = LOGMODE_NONE;
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310 | copy_file(skel, pw.pw_dir, FILEUTILS_RECUR);
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311 | logmode = LOGMODE_STDIO;
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312 | chown_main(4, (char**)args);
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313 | }
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314 | if ((mkdir_err != 0 && errno != EEXIST)
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315 | || chown(pw.pw_dir, pw.pw_uid, pw.pw_gid) != 0
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316 | || chmod(pw.pw_dir, 02755) != 0 /* set setgid bit on homedir */
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317 | ) {
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318 | bb_simple_perror_msg(pw.pw_dir);
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319 | }
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320 | }
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321 |
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322 | if (!(opts & OPT_DONT_SET_PASS)) {
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323 | /* interactively set passwd */
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324 | passwd_wrapper(pw.pw_name);
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325 | }
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326 |
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327 | return EXIT_SUCCESS;
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328 | }
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