[3320] | 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 | #include "libbb.h"
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| 11 |
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| 12 | #if CONFIG_LAST_SYSTEM_ID < CONFIG_FIRST_SYSTEM_ID
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| 13 | #error Bad LAST_SYSTEM_ID or FIRST_SYSTEM_ID in .config
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| 14 | #endif
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| 15 |
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| 16 | /* #define OPT_HOME (1 << 0) */ /* unused */
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| 17 | /* #define OPT_GECOS (1 << 1) */ /* unused */
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| 18 | #define OPT_SHELL (1 << 2)
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| 19 | #define OPT_GID (1 << 3)
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| 20 | #define OPT_DONT_SET_PASS (1 << 4)
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| 21 | #define OPT_SYSTEM_ACCOUNT (1 << 5)
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| 22 | #define OPT_DONT_MAKE_HOME (1 << 6)
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| 23 | #define OPT_UID (1 << 7)
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| 24 |
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| 25 | /* We assume UID_T_MAX == INT_MAX */
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| 26 | /* remix */
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| 27 | /* recoded such that the uid may be passed in *p */
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| 28 | static void passwd_study(struct passwd *p)
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| 29 | {
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| 30 | int max = UINT_MAX;
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| 31 |
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| 32 | if (getpwnam(p->pw_name)) {
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| 33 | bb_error_msg_and_die("%s '%s' in use", "user", p->pw_name);
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| 34 | /* this format string is reused in adduser and addgroup */
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| 35 | }
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| 36 |
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| 37 | if (!(option_mask32 & OPT_UID)) {
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| 38 | if (option_mask32 & OPT_SYSTEM_ACCOUNT) {
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| 39 | p->pw_uid = CONFIG_FIRST_SYSTEM_ID;
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| 40 | max = CONFIG_LAST_SYSTEM_ID;
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| 41 | } else {
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| 42 | p->pw_uid = CONFIG_LAST_SYSTEM_ID + 1;
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| 43 | max = 64999;
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| 44 | }
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| 45 | }
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| 46 | /* check for a free uid (and maybe gid) */
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| 47 | while (getpwuid(p->pw_uid) || (p->pw_gid == (gid_t)-1 && getgrgid(p->pw_uid))) {
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| 48 | if (option_mask32 & OPT_UID) {
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| 49 | /* -u N, cannot pick uid other than N: error */
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| 50 | bb_error_msg_and_die("%s '%s' in use", "uid", itoa(p->pw_uid));
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| 51 | /* this format string is reused in adduser and addgroup */
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| 52 | }
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| 53 | if (p->pw_uid == max) {
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| 54 | bb_error_msg_and_die("no %cids left", 'u');
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| 55 | }
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| 56 | p->pw_uid++;
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| 57 | }
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| 58 |
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| 59 | if (p->pw_gid == (gid_t)-1) {
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| 60 | p->pw_gid = p->pw_uid; /* new gid = uid */
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| 61 | if (getgrnam(p->pw_name)) {
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| 62 | bb_error_msg_and_die("%s '%s' in use", "group", p->pw_name);
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| 63 | /* this format string is reused in adduser and addgroup */
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| 64 | }
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| 65 | }
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| 66 | }
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| 67 |
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| 68 | static void addgroup_wrapper(struct passwd *p, const char *group_name)
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| 69 | {
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| 70 | char *cmd;
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| 71 |
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| 72 | if (group_name) /* Add user to existing group */
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| 73 | cmd = xasprintf("addgroup '%s' '%s'", p->pw_name, group_name);
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| 74 | else /* Add user to his own group with the first free gid found in passwd_study */
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| 75 | cmd = xasprintf("addgroup -g %u '%s'", (unsigned)p->pw_gid, p->pw_name);
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| 76 | /* Warning: to be compatible with external addgroup programs we should use --gid instead */
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| 77 | system(cmd);
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| 78 | free(cmd);
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| 79 | }
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| 80 |
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| 81 | static void passwd_wrapper(const char *login) NORETURN;
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| 82 |
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| 83 | static void passwd_wrapper(const char *login)
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| 84 | {
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| 85 | BB_EXECLP("passwd", "passwd", login, NULL);
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| 86 | bb_error_msg_and_die("can't execute passwd, you must set password manually");
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| 87 | }
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| 88 |
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| 89 | #if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS
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| 90 | static const char adduser_longopts[] ALIGN1 =
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| 91 | "home\0" Required_argument "h"
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| 92 | "gecos\0" Required_argument "g"
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| 93 | "shell\0" Required_argument "s"
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| 94 | "ingroup\0" Required_argument "G"
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| 95 | "disabled-password\0" No_argument "D"
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| 96 | "empty-password\0" No_argument "D"
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| 97 | "system\0" No_argument "S"
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| 98 | "no-create-home\0" No_argument "H"
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| 99 | "uid\0" Required_argument "u"
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| 100 | ;
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| 101 | #endif
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| 102 |
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| 103 | /*
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| 104 | * adduser will take a login_name as its first parameter.
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| 105 | * home, shell, gecos:
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| 106 | * can be customized via command-line parameters.
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| 107 | */
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| 108 | int adduser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 109 | int adduser_main(int argc UNUSED_PARAM, char **argv)
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| 110 | {
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| 111 | struct passwd pw;
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| 112 | const char *usegroup = NULL;
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| 113 | char *p;
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| 114 | unsigned opts;
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| 115 |
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| 116 | #if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS
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| 117 | applet_long_options = adduser_longopts;
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| 118 | #endif
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| 119 |
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| 120 | /* got root? */
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| 121 | if (geteuid()) {
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| 122 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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| 123 | }
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| 124 |
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| 125 | pw.pw_gecos = (char *)"Linux User,,,";
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| 126 | pw.pw_shell = (char *)DEFAULT_SHELL;
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| 127 | pw.pw_dir = NULL;
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| 128 |
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| 129 | /* exactly one non-option arg */
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| 130 | /* disable interactive passwd for system accounts */
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| 131 | opt_complementary = "=1:SD:u+";
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| 132 | if (sizeof(pw.pw_uid) == sizeof(int)) {
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| 133 | opts = getopt32(argv, "h:g:s:G:DSHu:", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup, &pw.pw_uid);
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| 134 | } else {
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| 135 | unsigned uid;
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| 136 | opts = getopt32(argv, "h:g:s:G:DSHu:", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup, &uid);
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| 137 | if (opts & OPT_UID) {
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| 138 | pw.pw_uid = uid;
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| 139 | }
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| 140 | }
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| 141 | argv += optind;
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| 142 |
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| 143 | /* fill in the passwd struct */
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| 144 | pw.pw_name = argv[0];
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| 145 | die_if_bad_username(pw.pw_name);
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| 146 | if (!pw.pw_dir) {
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| 147 | /* create string for $HOME if not specified already */
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| 148 | pw.pw_dir = xasprintf("/home/%s", argv[0]);
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| 149 | }
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| 150 | pw.pw_passwd = (char *)"x";
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| 151 | if (opts & OPT_SYSTEM_ACCOUNT) {
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| 152 | if (!usegroup) {
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| 153 | usegroup = "nogroup";
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| 154 | }
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| 155 | if (!(opts & OPT_SHELL)) {
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| 156 | pw.pw_shell = (char *) "/bin/false";
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| 157 | }
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| 158 | }
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| 159 | pw.pw_gid = usegroup ? xgroup2gid(usegroup) : -1; /* exits on failure */
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| 160 |
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| 161 | /* make sure everything is kosher and setup uid && maybe gid */
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| 162 | passwd_study(&pw);
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| 163 |
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| 164 | p = xasprintf("x:%u:%u:%s:%s:%s",
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| 165 | (unsigned) pw.pw_uid, (unsigned) pw.pw_gid,
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| 166 | pw.pw_gecos, pw.pw_dir, pw.pw_shell);
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| 167 | if (update_passwd(bb_path_passwd_file, pw.pw_name, p, NULL) < 0) {
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| 168 | return EXIT_FAILURE;
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| 169 | }
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| 170 | if (ENABLE_FEATURE_CLEAN_UP)
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| 171 | free(p);
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| 172 |
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| 173 | #if ENABLE_FEATURE_SHADOWPASSWDS
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| 174 | /* /etc/shadow fields:
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| 175 | * 1. username
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| 176 | * 2. encrypted password
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| 177 | * 3. last password change (unix date (unix time/24*60*60))
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| 178 | * 4. minimum days required between password changes
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| 179 | * 5. maximum days password is valid
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| 180 | * 6. days before password is to expire that user is warned
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| 181 | * 7. days after password expires that account is disabled
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| 182 | * 8. unix date when login expires (i.e. when it may no longer be used)
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| 183 | */
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| 184 | /* fields: 2 3 4 5 6 78 */
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| 185 | p = xasprintf("!:%u:0:99999:7:::", (unsigned)(time(NULL)) / (24*60*60));
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| 186 | /* ignore errors: if file is missing we suppose admin doesn't want it */
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| 187 | update_passwd(bb_path_shadow_file, pw.pw_name, p, NULL);
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| 188 | if (ENABLE_FEATURE_CLEAN_UP)
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| 189 | free(p);
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| 190 | #endif
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| 191 |
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| 192 | /* add to group */
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| 193 | addgroup_wrapper(&pw, usegroup);
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| 194 |
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| 195 | /* clear the umask for this process so it doesn't
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| 196 | * screw up the permissions on the mkdir and chown. */
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| 197 | umask(0);
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| 198 | if (!(opts & OPT_DONT_MAKE_HOME)) {
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| 199 | /* set the owner and group so it is owned by the new user,
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| 200 | * then fix up the permissions to 2755. Can't do it before
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| 201 | * since chown will clear the setgid bit */
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| 202 | int mkdir_err = mkdir(pw.pw_dir, 0755);
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| 203 | if (mkdir_err == 0) {
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| 204 | /* New home. Copy /etc/skel to it */
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| 205 | const char *args[] = {
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| 206 | "chown", "-R",
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| 207 | xasprintf("%u:%u", (int)pw.pw_uid, (int)pw.pw_gid),
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| 208 | pw.pw_dir, NULL
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| 209 | };
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| 210 | /* Be silent on any errors (like: no /etc/skel) */
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| 211 | logmode = LOGMODE_NONE;
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| 212 | copy_file("/etc/skel", pw.pw_dir, FILEUTILS_RECUR);
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| 213 | logmode = LOGMODE_STDIO;
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| 214 | chown_main(4, (char**)args);
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| 215 | }
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| 216 | if ((mkdir_err != 0 && errno != EEXIST)
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| 217 | || chown(pw.pw_dir, pw.pw_uid, pw.pw_gid) != 0
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| 218 | || chmod(pw.pw_dir, 02755) != 0 /* set setgid bit on homedir */
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| 219 | ) {
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| 220 | bb_simple_perror_msg(pw.pw_dir);
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| 221 | }
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| 222 | }
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| 223 |
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| 224 | if (!(opts & OPT_DONT_SET_PASS)) {
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| 225 | /* interactively set passwd */
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| 226 | passwd_wrapper(pw.pw_name);
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| 227 | }
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| 228 |
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| 229 | return EXIT_SUCCESS;
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| 230 | }
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