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 <stdio.h>
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12 | #include <sys/types.h>
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13 | #include <string.h>
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14 | #include <unistd.h>
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15 | #include <time.h>
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16 | #include <getopt.h>
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17 | #include <sys/stat.h>
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18 |
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19 | #include "busybox.h"
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20 |
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21 | #define DONT_SET_PASS (1 << 4)
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22 | #define DONT_MAKE_HOME (1 << 6)
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23 |
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24 |
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25 | /* remix */
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26 | /* EDR recoded such that the uid may be passed in *p */
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27 | static int passwd_study(const char *filename, struct passwd *p)
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28 | {
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29 | struct passwd *pw;
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30 | FILE *passwd;
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31 |
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32 | const int min = 500;
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33 | const int max = 65000;
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34 |
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35 | passwd = bb_xfopen(filename, "r");
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36 |
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37 | /* EDR if uid is out of bounds, set to min */
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38 | if ((p->pw_uid > max) || (p->pw_uid < min))
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39 | p->pw_uid = min;
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40 |
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41 | /* stuff to do:
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42 | * make sure login isn't taken;
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43 | * find free uid and gid;
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44 | */
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45 | while ((pw = fgetpwent(passwd))) {
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46 | if (strcmp(pw->pw_name, p->pw_name) == 0) {
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47 | /* return 0; */
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48 | return 1;
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49 | }
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50 | if ((pw->pw_uid >= p->pw_uid) && (pw->pw_uid < max)
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51 | && (pw->pw_uid >= min)) {
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52 | p->pw_uid = pw->pw_uid + 1;
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53 | }
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54 | }
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55 |
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56 | if (p->pw_gid == 0) {
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57 | /* EDR check for an already existing gid */
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58 | while (getgrgid(p->pw_uid) != NULL)
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59 | p->pw_uid++;
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60 |
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61 | /* EDR also check for an existing group definition */
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62 | if (getgrnam(p->pw_name) != NULL)
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63 | return 3;
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64 |
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65 | /* EDR create new gid always = uid */
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66 | p->pw_gid = p->pw_uid;
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67 | }
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68 |
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69 | /* EDR bounds check */
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70 | if ((p->pw_uid > max) || (p->pw_uid < min))
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71 | return 2;
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72 |
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73 | /* return 1; */
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74 | return 0;
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75 | }
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76 |
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77 | static void addgroup_wrapper(struct passwd *p)
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78 | {
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79 | char *cmd;
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80 |
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81 | cmd = bb_xasprintf("addgroup -g %d \"%s\"", p->pw_gid, p->pw_name);
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82 | system(cmd);
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83 | free(cmd);
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84 | }
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85 |
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86 | static void passwd_wrapper(const char *login) ATTRIBUTE_NORETURN;
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87 |
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88 | static void passwd_wrapper(const char *login)
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89 | {
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90 | static const char prog[] = "passwd";
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91 | execlp(prog, prog, login, NULL);
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92 | bb_error_msg_and_die("Failed to execute '%s', you must set the password for '%s' manually", prog, login);
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93 | }
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94 |
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95 | /* putpwent(3) remix */
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96 | static int adduser(struct passwd *p, unsigned long flags)
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97 | {
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98 | FILE *file;
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99 | int addgroup = !p->pw_gid;
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100 |
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101 | /* make sure everything is kosher and setup uid && gid */
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102 | file = bb_xfopen(bb_path_passwd_file, "a");
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103 | fseek(file, 0, SEEK_END);
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104 |
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105 | switch (passwd_study(bb_path_passwd_file, p)) {
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106 | case 1:
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107 | bb_error_msg_and_die("%s: login already in use", p->pw_name);
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108 | case 2:
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109 | bb_error_msg_and_die("illegal uid or no uids left");
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110 | case 3:
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111 | bb_error_msg_and_die("%s: group name already in use", p->pw_name);
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112 | }
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113 |
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114 | /* add to passwd */
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115 | if (putpwent(p, file) == -1) {
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116 | bb_perror_nomsg_and_die();
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117 | }
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118 | fclose(file);
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119 |
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120 | #if ENABLE_FEATURE_SHADOWPASSWDS
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121 | /* add to shadow if necessary */
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122 | file = bb_xfopen(bb_path_shadow_file, "a");
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123 | fseek(file, 0, SEEK_END);
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124 | fprintf(file, "%s:!:%ld:%d:%d:%d:::\n",
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125 | p->pw_name, /* username */
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126 | time(NULL) / 86400, /* sp->sp_lstchg */
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127 | 0, /* sp->sp_min */
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128 | 99999, /* sp->sp_max */
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129 | 7); /* sp->sp_warn */
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130 | fclose(file);
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131 | #endif
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132 |
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133 | /* add to group */
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134 | /* addgroup should be responsible for dealing w/ gshadow */
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135 | /* if using a pre-existing group, don't create one */
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136 | if (addgroup) addgroup_wrapper(p);
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137 |
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138 | /* Clear the umask for this process so it doesn't
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139 | * * screw up the permissions on the mkdir and chown. */
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140 | umask(0);
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141 | if (!(flags & DONT_MAKE_HOME)) {
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142 | /* Set the owner and group so it is owned by the new user,
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143 | then fix up the permissions to 2755. Can't do it before
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144 | since chown will clear the setgid bit */
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145 | if (mkdir(p->pw_dir, 0755)
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146 | || chown(p->pw_dir, p->pw_uid, p->pw_gid)
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147 | || chmod(p->pw_dir, 02755)) {
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148 | bb_perror_msg("%s", p->pw_dir);
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149 | }
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150 | }
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151 |
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152 | if (!(flags & DONT_SET_PASS)) {
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153 | /* interactively set passwd */
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154 | passwd_wrapper(p->pw_name);
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155 | }
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156 |
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157 | return 0;
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158 | }
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159 |
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160 | /*
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161 | * adduser will take a login_name as its first parameter.
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162 | *
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163 | * home
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164 | * shell
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165 | * gecos
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166 | *
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167 | * can be customized via command-line parameters.
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168 | * ________________________________________________________________________ */
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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 | unsigned long flags;
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174 |
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175 | pw.pw_gecos = "Linux User,,,";
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176 | pw.pw_shell = (char *)DEFAULT_SHELL;
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177 | pw.pw_dir = NULL;
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178 |
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179 | /* check for min, max and missing args and exit on error */
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180 | bb_opt_complementally = "-1:?1:?";
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181 | flags = bb_getopt_ulflags(argc, argv, "h:g:s:G:DSH", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup);
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182 |
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183 | /* got root? */
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184 | if(geteuid()) {
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185 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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186 | }
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187 |
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188 | /* create string for $HOME if not specified already */
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189 | if (!pw.pw_dir) {
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190 | snprintf(bb_common_bufsiz1, BUFSIZ, "/home/%s", argv[optind]);
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191 | pw.pw_dir = &bb_common_bufsiz1[0];
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192 | }
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193 |
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194 | /* create a passwd struct */
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195 | pw.pw_name = argv[optind];
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196 | pw.pw_passwd = "x";
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197 | pw.pw_uid = 0;
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198 | pw.pw_gid = (usegroup) ? bb_xgetgrnam(usegroup) : 0; /* exits on failure */
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199 |
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200 | /* grand finale */
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201 | return adduser(&pw, flags);
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202 | }
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