Mercurial > hg > toybox
annotate toys/pending/useradd.c @ 1363:e65f9a9ba62d draft
Cleanup pass on mkpasswd.c
author | Rob Landley <rob@landley.net> |
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date | Wed, 25 Jun 2014 22:54:59 -0500 |
parents | c7bf4541d5be |
children | ed28d4d9558d |
rev | line source |
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1 /* useradd.c - add a new user |
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2 * |
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3 * Copyright 2013 Ashwini Kumar <ak.ashwini@gmail.com> |
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4 * Copyright 2013 Kyungwan Han <asura321@gmail.com> |
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5 * |
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6 * See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/useradd.html |
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7 |
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8 USE_USERADD(NEWTOY(useradd, "<1>2u#<0G:s:g:h:SDH", TOYFLAG_NEEDROOT|TOYFLAG_SBIN)) |
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9 USE_USERADD(OLDTOY(adduser, useradd, OPTSTR_useradd, TOYFLAG_NEEDROOT|TOYFLAG_SBIN)) |
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10 |
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11 config USERADD |
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12 bool "useradd" |
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13 default n |
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14 help |
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15 usage: useradd [-SDH] [-hDIR] [-sSHELL] [-G GRP] [-gGECOS] [-uUID] USER [GROUP] |
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16 |
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17 Create new user, or add USER to GROUP |
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18 |
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19 -h DIR Home directory |
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20 -g GECOS GECOS field |
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21 -s SHELL Login shell |
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22 -G GRP Add user to existing group |
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23 -S Create a system user |
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24 -D Don't assign a password |
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25 -H Don't create home directory |
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26 -u UID User id |
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27 */ |
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28 |
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29 #define FOR_useradd |
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30 #include "toys.h" |
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31 |
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32 GLOBALS( |
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33 char *dir; |
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34 char *gecos; |
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35 char *shell; |
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36 char *u_grp; |
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37 long uid; |
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38 long gid; |
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39 ) |
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40 |
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41 static char* get_shell(void) |
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42 { |
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43 char *shell = getenv("SHELL"); |
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44 |
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45 if (!shell) { |
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46 struct passwd *pw; |
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47 pw = getpwuid(getuid()); |
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48 if (pw && pw->pw_shell && pw->pw_shell[0]) |
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49 shell = pw->pw_shell; |
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50 else shell = "/bin/sh"; |
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51 } |
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52 return xstrdup(shell); |
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53 } |
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54 |
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55 /* exec_wait() function does a fork(), and exec the command, |
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56 * waits for the child to exit and return the status to parent |
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57 */ |
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58 static int exec_wait(char **args) |
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59 { |
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60 int status = 0; |
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61 pid_t pid = xfork(); |
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62 |
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63 if (!pid) xexec(args); |
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64 else waitpid(pid, &status, 0); |
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65 |
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66 return WIFEXITED(status) ? WEXITSTATUS(status) : WTERMSIG(status)+127; |
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67 } |
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68 |
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69 /* create_copy_skel(), This function will create the home directory of the |
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70 * user, by copying /etc/skel/ contents to /home/<username>. |
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71 * Then change the ownership of home dir to the UID and GID of new user, |
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72 * and Mode to 0700, i.e. rwx------ for user. |
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73 */ |
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74 static void create_copy_skel(char *skel, char *hdir) |
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75 { |
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76 char *args[5]; |
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77 struct stat sb; |
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78 |
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79 if (toys.optflags & FLAG_H) return; |
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80 |
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81 umask(0); |
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82 args[4] = NULL; |
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83 if (stat(hdir, &sb)) { |
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84 args[0] = "cp"; |
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85 args[1] = "-R"; |
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86 args[2] = skel; |
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87 args[3] = hdir; |
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88 // Copy /etc/skel to home dir |
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89 toys.exitval = exec_wait(args); |
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90 |
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91 args[0] = "chown"; |
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92 args[1] = "-R"; |
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93 args[2] = xmprintf("%u:%u", TT.uid, TT.gid); |
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94 args[3] = hdir; |
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95 //Change ownership to that of UID and GID of new user |
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96 toys.exitval = exec_wait(args); |
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97 |
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98 } else xprintf("Warning: home directory for the user already exists\n" |
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99 "Not copying any file from skel directory into it.\n"); |
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100 |
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101 if (chown(hdir, TT.uid, TT.gid) || chmod(hdir, 0700)) |
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102 perror_exit("chown/chmod failed for '%s'", hdir); |
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103 } |
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104 |
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105 /* Add a new group to the system, if UID is given then that is validated |
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106 * to be free, else a free UID is choosen by self. |
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107 * SYSTEM IDs are considered in the range 100 ... 999 |
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108 * add_user(), add a new entry in /etc/passwd, /etc/shadow files |
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109 */ |
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110 static void new_user() |
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111 { |
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112 struct passwd pwd; |
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113 char *entry, *args[4]; |
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114 int max = INT_MAX; |
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115 |
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116 pwd.pw_name = *toys.optargs; |
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117 pwd.pw_passwd = (char *)"x"; |
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118 if (toys.optflags & FLAG_g) pwd.pw_gecos = TT.gecos; |
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119 else pwd.pw_gecos = "Linux User,"; |
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120 if (toys.optflags & FLAG_h) pwd.pw_dir = TT.dir; |
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121 else pwd.pw_dir = xmprintf("/home/%s", *toys.optargs); |
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122 if (toys.optflags & FLAG_s) pwd.pw_shell = TT.shell; |
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123 else pwd.pw_shell = get_shell(); |
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124 |
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125 if (toys.optflags & FLAG_u) { |
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126 if (TT.uid > INT_MAX) error_exit("uid should be less than '%d' ", INT_MAX); |
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127 if (getpwuid(TT.uid)) error_exit("user '%ld' is in use", TT.uid); |
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128 pwd.pw_uid = TT.uid; |
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129 } else { |
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130 if (toys.optflags & FLAG_S) { |
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131 TT.uid = SYS_FIRST_ID; |
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132 max = SYS_LAST_ID; |
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133 } else { |
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134 TT.uid = SYS_LAST_ID + 1; //i.e. starting from 1000 |
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135 max = 60000; // as per config file on Linux desktop |
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136 } |
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137 //find unused uid |
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138 while (TT.uid <= max) { |
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139 if (!getpwuid(TT.uid)) break; |
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140 if (TT.uid == max) error_exit("no more free uids left"); |
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141 TT.uid++; |
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142 } |
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143 pwd.pw_uid = TT.uid; |
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144 } |
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145 |
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146 if (toys.optflags & FLAG_G) { |
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147 struct group *gr = getgrnam(TT.u_grp); |
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148 if (!gr) error_exit("The group '%s' doesn't exist", TT.u_grp); |
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149 TT.gid = gr->gr_gid; |
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150 } else { |
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151 // Set the GID for the user, if not specified |
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152 if (toys.optflags & FLAG_S) { |
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153 TT.gid = SYS_FIRST_ID; |
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154 max = SYS_LAST_ID; |
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155 } else TT.gid = ((TT.uid > SYS_LAST_ID) ? TT.uid : SYS_LAST_ID + 1); |
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156 if (getgrnam(pwd.pw_name)) error_exit("group '%s' is in use", pwd.pw_name); |
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157 //find unused gid |
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158 while (TT.gid <= max) { |
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159 if (!getgrgid(TT.gid)) break; |
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160 if (TT.gid == max) error_exit("no more free gids left"); |
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161 TT.gid++; |
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162 } |
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163 } |
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164 pwd.pw_gid = TT.gid; |
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165 |
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166 if (!(toys.optflags & FLAG_G)) { |
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167 // Create a new group for user |
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168 //add group, invoke addgroup command |
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169 args[0] = "groupadd"; |
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170 args[1] = toys.optargs[0]; |
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171 args[2] = xmprintf("-g%ld", pwd.pw_gid); |
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172 args[3] = NULL; |
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173 if (exec_wait(args)) error_msg("addgroup fail"); |
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174 } |
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175 |
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176 /*add user to system |
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177 * 1. add an entry to /etc/passwd and /etcshadow file |
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178 * 2. Copy /etc/skel dir contents to use home dir |
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179 * 3. update the user passwd by running 'passwd' utility |
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180 */ |
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181 |
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182 // 1. add an entry to /etc/passwd and /etc/shadow file |
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183 entry = xmprintf("%s:%s:%ld:%ld:%s:%s:%s", pwd.pw_name, pwd.pw_passwd, |
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184 pwd.pw_uid, pwd.pw_gid, pwd.pw_gecos, pwd.pw_dir, pwd.pw_shell); |
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185 if (update_password("/etc/passwd", pwd.pw_name, entry)) error_exit("updating passwd file failed"); |
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186 free(entry); |
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187 |
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188 if (toys.optflags & FLAG_S) |
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189 entry = xmprintf("%s:!!:%u::::::", pwd.pw_name, |
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190 (unsigned)(time(NULL))/(24*60*60)); //passwd is not set initially |
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191 else entry = xmprintf("%s:!!:%u:%ld:%ld:%ld:::", pwd.pw_name, |
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192 (unsigned)(time(NULL))/(24*60*60), 0, 99999, 7); //passwd is not set initially |
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193 update_password("/etc/shadow", pwd.pw_name, entry); |
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194 free(entry); |
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195 |
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196 //2. craete home dir & copy skel dir to home |
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197 if (!(toys.optflags & FLAG_S)) create_copy_skel("/etc/skel", pwd.pw_dir); |
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198 |
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199 //3. update the user passwd by running 'passwd' utility |
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200 if (!(toys.optflags & FLAG_D)) { |
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201 args[0] = "passwd"; |
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202 args[1] = pwd.pw_name; |
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203 args[2] = NULL; |
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204 if (exec_wait(args)) error_exit("changing user passwd failed"); |
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205 } |
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206 if (toys.optflags & FLAG_G) { |
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207 /*add user to the existing group, invoke addgroup command */ |
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208 args[0] = "groupadd"; |
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209 args[1] = toys.optargs[0]; |
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210 args[2] = TT.u_grp; |
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211 args[3] = NULL; |
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212 if (exec_wait(args)) error_exit("adding user to group Failed"); |
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213 } |
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214 } |
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215 |
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216 /* Entry point for useradd feature |
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217 * Specifying options and User, Group at cmdline is treated as error. |
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218 * If only 2 parameters (Non-Option) are given, then User is added to the |
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219 * Group |
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220 */ |
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221 void useradd_main(void) |
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222 { |
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223 struct passwd *pwd = NULL; |
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224 |
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225 if (toys.optflags && toys.optc == 2) { |
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226 toys.exithelp = 1; |
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227 error_exit("options, user and group can't be together"); |
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228 } |
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229 |
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230 if (toys.optc == 2) { |
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231 //add user to group |
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232 //toys.optargs[0]- user, toys.optargs[1] - group |
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233 char *args[4]; |
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234 args[0] = "groupadd"; |
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235 args[1] = toys.optargs[0]; |
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236 args[2] = toys.optargs[1]; |
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237 args[3] = NULL; |
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238 toys.exitval = exec_wait(args); |
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239 } else { //new user to be created |
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240 // investigate the user to be created |
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241 if ((pwd = getpwnam(*toys.optargs))) |
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242 error_exit("user '%s' is in use", *toys.optargs); |
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243 is_valid_username(*toys.optargs); //validate the user name |
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244 new_user(); |
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245 } |
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246 } |