[821] | 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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[1770] | 11 | #include "libbb.h"
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[821] | 12 |
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[1770] | 13 | #define OPT_DONT_SET_PASS (1 << 4)
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| 14 | #define OPT_DONT_MAKE_HOME (1 << 6)
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[821] | 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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[1770] | 21 | enum { min = 500, max = 65000 };
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[821] | 22 | FILE *passwd;
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[1770] | 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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[821] | 28 |
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[1770] | 29 | passwd = xfopen(filename, "r");
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[821] | 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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[1770] | 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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[821] | 41 | /* return 0; */
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| 42 | return 1;
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| 43 | }
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[1770] | 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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[821] | 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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[1770] | 75 | cmd = xasprintf("addgroup -g %d \"%s\"", p->pw_gid, p->pw_name);
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[821] | 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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[1770] | 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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[821] | 88 | }
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| 89 |
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| 90 | /* putpwent(3) remix */
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[1770] | 91 | static int adduser(struct passwd *p)
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[821] | 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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[1770] | 97 | file = xfopen(bb_path_passwd_file, "a");
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[821] | 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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[1770] | 107 | }
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[821] | 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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[1770] | 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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[821] | 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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[1770] | 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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[821] | 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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[1770] | 138 | * screw up the permissions on the mkdir and chown. */
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[821] | 139 | umask(0);
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[1770] | 140 | if (!(option_mask32 & OPT_DONT_MAKE_HOME)) {
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[821] | 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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[1770] | 147 | bb_perror_msg("%s", p->pw_dir);
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| 148 | }
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[821] | 149 | }
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| 150 |
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[1770] | 151 | if (!(option_mask32 & OPT_DONT_SET_PASS)) {
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[821] | 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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[1770] | 167 | */
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| 168 | int adduser_main(int argc, char **argv);
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[821] | 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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[1770] | 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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[821] | 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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[1770] | 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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[821] | 187 |
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[1770] | 188 | /* create a passwd struct */
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| 189 | pw.pw_name = argv[0];
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[821] | 190 | if (!pw.pw_dir) {
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[1770] | 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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[821] | 193 | }
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[1770] | 194 | pw.pw_passwd = (char *)"x";
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[821] | 195 | pw.pw_uid = 0;
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[1770] | 196 | pw.pw_gid = usegroup ? xgroup2gid(usegroup) : 0; /* exits on failure */
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[821] | 197 |
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| 198 | /* grand finale */
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[1770] | 199 | return adduser(&pw);
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[821] | 200 | }
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