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 the GPL v2 or later, see the file LICENSE in this tarball.
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9 | */
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10 |
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11 | #include "libbb.h"
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12 |
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13 | #define OPT_DONT_SET_PASS (1 << 4)
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14 | #define OPT_DONT_MAKE_HOME (1 << 6)
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15 |
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16 |
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17 | /* remix */
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18 | /* EDR recoded such that the uid may be passed in *p */
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19 | static int passwd_study(const char *filename, struct passwd *p)
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20 | {
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21 | enum { min = 500, max = 65000 };
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22 | FILE *passwd;
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23 | /* We are using reentrant fgetpwent_r() in order to avoid
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24 | * pulling in static buffers from libc (think static build here) */
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25 | char buffer[256];
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26 | struct passwd pw;
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27 | struct passwd *result;
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28 |
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29 | passwd = xfopen(filename, "r");
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30 |
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31 | /* EDR if uid is out of bounds, set to min */
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32 | if ((p->pw_uid > max) || (p->pw_uid < min))
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33 | p->pw_uid = min;
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34 |
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35 | /* stuff to do:
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36 | * make sure login isn't taken;
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37 | * find free uid and gid;
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38 | */
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39 | while (!fgetpwent_r(passwd, &pw, buffer, sizeof(buffer), &result)) {
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40 | if (strcmp(pw.pw_name, p->pw_name) == 0) {
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41 | /* return 0; */
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42 | return 1;
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43 | }
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44 | if ((pw.pw_uid >= p->pw_uid) && (pw.pw_uid < max)
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45 | && (pw.pw_uid >= min)) {
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46 | p->pw_uid = pw.pw_uid + 1;
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47 | }
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48 | }
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49 |
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50 | if (p->pw_gid == 0) {
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51 | /* EDR check for an already existing gid */
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52 | while (getgrgid(p->pw_uid) != NULL)
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53 | p->pw_uid++;
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54 |
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55 | /* EDR also check for an existing group definition */
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56 | if (getgrnam(p->pw_name) != NULL)
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57 | return 3;
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58 |
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59 | /* EDR create new gid always = uid */
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60 | p->pw_gid = p->pw_uid;
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61 | }
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62 |
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63 | /* EDR bounds check */
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64 | if ((p->pw_uid > max) || (p->pw_uid < min))
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65 | return 2;
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66 |
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67 | /* return 1; */
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68 | return 0;
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69 | }
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70 |
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71 | static void addgroup_wrapper(struct passwd *p)
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72 | {
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73 | char *cmd;
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74 |
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75 | cmd = xasprintf("addgroup -g %d \"%s\"", p->pw_gid, p->pw_name);
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76 | system(cmd);
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77 | free(cmd);
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78 | }
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79 |
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80 | static void passwd_wrapper(const char *login) ATTRIBUTE_NORETURN;
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81 |
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82 | static void passwd_wrapper(const char *login)
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83 | {
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84 | static const char prog[] ALIGN1 = "passwd";
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85 |
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86 | BB_EXECLP(prog, prog, login, NULL);
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87 | bb_error_msg_and_die("failed to execute '%s', you must set the password for '%s' manually", prog, login);
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88 | }
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89 |
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90 | /* putpwent(3) remix */
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91 | static int adduser(struct passwd *p)
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92 | {
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93 | FILE *file;
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94 | int addgroup = !p->pw_gid;
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95 |
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96 | /* make sure everything is kosher and setup uid && gid */
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97 | file = xfopen(bb_path_passwd_file, "a");
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98 | fseek(file, 0, SEEK_END);
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99 |
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100 | switch (passwd_study(bb_path_passwd_file, p)) {
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101 | case 1:
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102 | bb_error_msg_and_die("%s: login already in use", p->pw_name);
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103 | case 2:
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104 | bb_error_msg_and_die("illegal uid or no uids left");
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105 | case 3:
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106 | bb_error_msg_and_die("%s: group name already in use", p->pw_name);
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107 | }
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108 |
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109 | /* add to passwd */
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110 | if (putpwent(p, file) == -1) {
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111 | bb_perror_nomsg_and_die();
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112 | }
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113 | /* Do fclose even if !ENABLE_FEATURE_CLEAN_UP.
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114 | * We will exec passwd, files must be flushed & closed before that! */
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115 | fclose(file);
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116 |
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117 | #if ENABLE_FEATURE_SHADOWPASSWDS
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118 | /* add to shadow if necessary */
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119 | file = fopen_or_warn(bb_path_shadow_file, "a");
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120 | if (file) {
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121 | fseek(file, 0, SEEK_END);
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122 | fprintf(file, "%s:!:%ld:%d:%d:%d:::\n",
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123 | p->pw_name, /* username */
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124 | time(NULL) / 86400, /* sp->sp_lstchg */
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125 | 0, /* sp->sp_min */
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126 | 99999, /* sp->sp_max */
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127 | 7); /* sp->sp_warn */
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128 | fclose(file);
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129 | }
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130 | #endif
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131 |
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132 | /* add to group */
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133 | /* addgroup should be responsible for dealing w/ gshadow */
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134 | /* if using a pre-existing group, don't create one */
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135 | if (addgroup) addgroup_wrapper(p);
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136 |
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137 | /* Clear the umask for this process so it doesn't
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138 | * screw up the permissions on the mkdir and chown. */
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139 | umask(0);
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140 | if (!(option_mask32 & OPT_DONT_MAKE_HOME)) {
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141 | /* Set the owner and group so it is owned by the new user,
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142 | then fix up the permissions to 2755. Can't do it before
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143 | since chown will clear the setgid bit */
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144 | if (mkdir(p->pw_dir, 0755)
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145 | || chown(p->pw_dir, p->pw_uid, p->pw_gid)
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146 | || chmod(p->pw_dir, 02755)) {
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147 | bb_perror_msg("%s", p->pw_dir);
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148 | }
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149 | }
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150 |
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151 | if (!(option_mask32 & OPT_DONT_SET_PASS)) {
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152 | /* interactively set passwd */
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153 | passwd_wrapper(p->pw_name);
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154 | }
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155 |
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156 | return 0;
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157 | }
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158 |
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159 | /*
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160 | * adduser will take a login_name as its first parameter.
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161 | *
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162 | * home
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163 | * shell
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164 | * gecos
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165 | *
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166 | * can be customized via command-line parameters.
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167 | */
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168 | int adduser_main(int argc, char **argv);
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169 | int adduser_main(int argc, char **argv)
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170 | {
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171 | struct passwd pw;
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172 | const char *usegroup = NULL;
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173 |
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174 | /* got root? */
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175 | if (geteuid()) {
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176 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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177 | }
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178 |
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179 | pw.pw_gecos = (char *)"Linux User,,,";
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180 | pw.pw_shell = (char *)DEFAULT_SHELL;
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181 | pw.pw_dir = NULL;
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182 |
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183 | /* exactly one non-option arg */
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184 | opt_complementary = "=1";
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185 | getopt32(argv, "h:g:s:G:DSH", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup);
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186 | argv += optind;
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187 |
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188 | /* create a passwd struct */
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189 | pw.pw_name = argv[0];
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190 | if (!pw.pw_dir) {
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191 | /* create string for $HOME if not specified already */
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192 | pw.pw_dir = xasprintf("/home/%s", argv[0]);
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193 | }
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194 | pw.pw_passwd = (char *)"x";
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195 | pw.pw_uid = 0;
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196 | pw.pw_gid = usegroup ? xgroup2gid(usegroup) : 0; /* exits on failure */
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197 |
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198 | /* grand finale */
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199 | return adduser(&pw);
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200 | }
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