1/* vi: set sw=4 ts=4: */ 2/* 3 * adduser - add users to /etc/passwd and /etc/shadow 4 * 5 * Copyright (C) 1999 by Lineo, inc. and John Beppu 6 * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org> 7 * 8 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. 9 */ 10 11#include "libbb.h" 12 13#define OPT_DONT_SET_PASS (1 << 4) 14#define OPT_DONT_MAKE_HOME (1 << 6) 15 16 17/* remix */ 18/* EDR recoded such that the uid may be passed in *p */ 19static int passwd_study(const char *filename, struct passwd *p) 20{ 21 enum { min = 500, max = 65000 }; 22 FILE *passwd; 23 /* We are using reentrant fgetpwent_r() in order to avoid 24 * pulling in static buffers from libc (think static build here) */ 25 char buffer[256]; 26 struct passwd pw; 27 struct passwd *result; 28 29 passwd = xfopen(filename, "r"); 30 31 /* EDR if uid is out of bounds, set to min */ 32 if ((p->pw_uid > max) || (p->pw_uid < min)) 33 p->pw_uid = min; 34 35 /* stuff to do: 36 * make sure login isn't taken; 37 * find free uid and gid; 38 */ 39 while (!fgetpwent_r(passwd, &pw, buffer, sizeof(buffer), &result)) { 40 if (strcmp(pw.pw_name, p->pw_name) == 0) { 41 /* return 0; */ 42 return 1; 43 } 44 if ((pw.pw_uid >= p->pw_uid) && (pw.pw_uid < max) 45 && (pw.pw_uid >= min)) { 46 p->pw_uid = pw.pw_uid + 1; 47 } 48 } 49 50 if (p->pw_gid == 0) { 51 /* EDR check for an already existing gid */ 52 while (getgrgid(p->pw_uid) != NULL) 53 p->pw_uid++; 54 55 /* EDR also check for an existing group definition */ 56 if (getgrnam(p->pw_name) != NULL) 57 return 3; 58 59 /* EDR create new gid always = uid */ 60 p->pw_gid = p->pw_uid; 61 } 62 63 /* EDR bounds check */ 64 if ((p->pw_uid > max) || (p->pw_uid < min)) 65 return 2; 66 67 /* return 1; */ 68 return 0; 69} 70 71static void addgroup_wrapper(struct passwd *p) 72{ 73 char *cmd; 74 75 cmd = xasprintf("addgroup -g %d \"%s\"", p->pw_gid, p->pw_name); 76 system(cmd); 77 free(cmd); 78} 79 80static void passwd_wrapper(const char *login) ATTRIBUTE_NORETURN; 81 82static void passwd_wrapper(const char *login) 83{ 84 static const char prog[] ALIGN1 = "passwd"; 85 86 BB_EXECLP(prog, prog, login, NULL); 87 bb_error_msg_and_die("failed to execute '%s', you must set the password for '%s' manually", prog, login); 88} 89 90/* putpwent(3) remix */ 91static int adduser(struct passwd *p) 92{ 93 FILE *file; 94 int addgroup = !p->pw_gid; 95 96 /* make sure everything is kosher and setup uid && gid */ 97 file = xfopen(bb_path_passwd_file, "a"); 98 fseek(file, 0, SEEK_END); 99 100 switch (passwd_study(bb_path_passwd_file, p)) { 101 case 1: 102 bb_error_msg_and_die("%s: login already in use", p->pw_name); 103 case 2: 104 bb_error_msg_and_die("illegal uid or no uids left"); 105 case 3: 106 bb_error_msg_and_die("%s: group name already in use", p->pw_name); 107 } 108 109 /* add to passwd */ 110 if (putpwent(p, file) == -1) { 111 bb_perror_nomsg_and_die(); 112 } 113 /* Do fclose even if !ENABLE_FEATURE_CLEAN_UP. 114 * We will exec passwd, files must be flushed & closed before that! */ 115 fclose(file); 116 117#if ENABLE_FEATURE_SHADOWPASSWDS 118 /* add to shadow if necessary */ 119 file = fopen_or_warn(bb_path_shadow_file, "a"); 120 if (file) { 121 fseek(file, 0, SEEK_END); 122 fprintf(file, "%s:!:%ld:%d:%d:%d:::\n", 123 p->pw_name, /* username */ 124 time(NULL) / 86400, /* sp->sp_lstchg */ 125 0, /* sp->sp_min */ 126 99999, /* sp->sp_max */ 127 7); /* sp->sp_warn */ 128 fclose(file); 129 } 130#endif 131 132 /* add to group */ 133 /* addgroup should be responsible for dealing w/ gshadow */ 134 /* if using a pre-existing group, don't create one */ 135 if (addgroup) addgroup_wrapper(p); 136 137 /* Clear the umask for this process so it doesn't 138 * screw up the permissions on the mkdir and chown. */ 139 umask(0); 140 if (!(option_mask32 & OPT_DONT_MAKE_HOME)) { 141 /* Set the owner and group so it is owned by the new user, 142 then fix up the permissions to 2755. Can't do it before 143 since chown will clear the setgid bit */ 144 if (mkdir(p->pw_dir, 0755) 145 || chown(p->pw_dir, p->pw_uid, p->pw_gid) 146 || chmod(p->pw_dir, 02755)) { 147 bb_perror_msg("%s", p->pw_dir); 148 } 149 } 150 151 if (!(option_mask32 & OPT_DONT_SET_PASS)) { 152 /* interactively set passwd */ 153 passwd_wrapper(p->pw_name); 154 } 155 156 return 0; 157} 158 159/* 160 * adduser will take a login_name as its first parameter. 161 * 162 * home 163 * shell 164 * gecos 165 * 166 * can be customized via command-line parameters. 167 */ 168int adduser_main(int argc, char **argv); 169int adduser_main(int argc, char **argv) 170{ 171 struct passwd pw; 172 const char *usegroup = NULL; 173 174 /* got root? */ 175 if (geteuid()) { 176 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); 177 } 178 179 pw.pw_gecos = (char *)"Linux User,,,"; 180 pw.pw_shell = (char *)DEFAULT_SHELL; 181 pw.pw_dir = NULL; 182 183 /* exactly one non-option arg */ 184 opt_complementary = "=1"; 185 getopt32(argv, "h:g:s:G:DSH", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup); 186 argv += optind; 187 188 /* create a passwd struct */ 189 pw.pw_name = argv[0]; 190 if (!pw.pw_dir) { 191 /* create string for $HOME if not specified already */ 192 pw.pw_dir = xasprintf("/home/%s", argv[0]); 193 } 194 pw.pw_passwd = (char *)"x"; 195 pw.pw_uid = 0; 196 pw.pw_gid = usegroup ? xgroup2gid(usegroup) : 0; /* exits on failure */ 197 198 /* grand finale */ 199 return adduser(&pw); 200} 201