src/bin/multiuser/useradd.cpp

   1 /*
   2  * Copyright 2008-2013, Ingo Weinhold, ingo_weinhold@gmx.de.
   3  * Distributed under the terms of the MIT License.
   4  */
   5
   6 #include <errno.h>
   7 #include <getopt.h>
   8 #include <pwd.h>
   9 #include <shadow.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <termios.h>
  14 #include <time.h>
  15 #include <unistd.h>
  16
  17 #include <OS.h>
  18 #include <parsedate.h>
  19
  20 #include <RegistrarDefs.h>
  21 #include <user_group.h>
  22 #include <util/KMessage.h>
  23
  24 #include <AutoDeleter.h>
  25
  26 #include "multiuser_utils.h"
  27
  28
  29 extern const char *__progname;
  30
  31
  32 static const char* kUsage =
  33         "Usage: %s [ <options> ] <user name>\n"
  34         "Creates a new user <user name>.\n"
  35         "\n"
  36         "Options:\n"
  37         "  -d <home>\n"
  38         "    Specifies the home directory for the new user.\n"
  39         "  -e <expiration>\n"
  40         "    Specifies the expiration date for the new user's account.\n"
  41         "  -f <inactive>\n"
  42         "    Specifies the number of days after the expiration of the new user's "
  43                         "password\n"
  44         "    until the account expires.\n"
  45         "  -g <gid>\n"
  46         "    Specifies the new user's primary group by ID or name.\n"
  47         "  -h, --help\n"
  48         "    Print usage info.\n"
  49         "  -s <shell>\n"
  50         "    Specifies the new user's login shell.\n"
  51         "  -n <real name>\n"
  52         "    Specifies the new user's real name.\n"
  53         ;
  54
  55 static void
  56 print_usage_and_exit(bool error)
  57 {
  58         fprintf(error ? stderr : stdout, kUsage, __progname);
  59         exit(error ? 1 : 0);
  60 }
  61
  62
  63 int
  64 main(int argc, const char* const* argv)
  65 {
  66         const char* home = "/boot/home";
  67         int expiration = 99999;
  68         int inactive = -1;
  69         const char* group = NULL;
  70         const char* shell = "/bin/sh";
  71         const char* realName = "";
  72
  73         int min = -1;
  74         int max = -1;
  75         int warn = 7;
  76
  77         while (true) {
  78                 static struct option sLongOptions[] = {
  79                         { "help", no_argument, 0, 'h' },
  80                         { 0, 0, 0, 0 }
  81                 };
  82
  83                 opterr = 0; // don't print errors
  84                 int c = getopt_long(argc, (char**)argv, "d:e:f:g:hn:s:", sLongOptions,
  85                         NULL);
  86                 if (c == -1)
  87                         break;
  88
  89
  90                 switch (c) {
  91                         case 'd':
  92                                 home = optarg;
  93                                 break;
  94
  95                         case 'e':
  96                                 expiration = parsedate(optarg, time(NULL)) / (3600 * 24);
  97                                 break;
  98
  99                         case 'f':
 100                                 inactive = atoi(optarg);
 101                                 break;
 102
 103                         case 'g':
 104                         {
 105                                 group = optarg;
 106                                 break;
 107                         }
 108
 109                         case 'h':
 110                                 print_usage_and_exit(false);
 111                                 break;
 112
 113                         case 'n':
 114                                 realName = optarg;
 115                                 break;
 116
 117                         case 's':
 118                                 shell = optarg;
 119                                 break;
 120
 121                         default:
 122                                 print_usage_and_exit(true);
 123                                 break;
 124                 }
 125         }
 126
 127         if (optind != argc - 1)
 128                 print_usage_and_exit(true);
 129
 130         const char* user = argv[optind];
 131
 132         if (geteuid() != 0) {
 133                 fprintf(stderr, "Error: Only root may add users.\n");
 134                 exit(1);
 135         }
 136
 137         // check, if user already exists
 138         if (getpwnam(user) != NULL) {
 139                 fprintf(stderr, "Error: User \"%s\" already exists.\n", user);
 140                 exit(1);
 141         }
 142
 143         // get group ID
 144         gid_t gid = 100;
 145         if (group != NULL) {
 146                 char* end;
 147                 gid = strtol(group, &end, 0);
 148                 if (*end == '\0') {
 149                         // seems to be a number
 150                         if (gid < 1) {
 151                                 fprintf(stderr, "Error: Invalid group ID \"%s\".\n",
 152                                         group);
 153                                 exit(1);
 154                         }
 155                 } else {
 156                         // must be a group name -- get it
 157                         char* buffer = NULL;
 158                         ssize_t bufferSize = sysconf(_SC_GETGR_R_SIZE_MAX);
 159                         if (bufferSize <= 0)
 160                                 bufferSize = 256;
 161                         for (;;) {
 162                                 buffer = (char*)realloc(buffer, bufferSize);
 163                                 if (buffer == NULL) {
 164                                         fprintf(stderr, "Error: Out of memory!\n");
 165                                         exit(1);
 166                                 }
 167
 168                                 struct group groupBuffer;
 169                                 struct group* groupFound;
 170                                 int error = getgrnam_r(group, &groupBuffer, buffer, bufferSize,
 171                                         &groupFound);
 172                                 if (error == ERANGE) {
 173                                         bufferSize *= 2;
 174                                         continue;
 175                                 }
 176
 177                                 if (error != 0) {
 178                                         fprintf(stderr, "Error: Failed to get info for group "
 179                                                 "\"%s\".\n", group);
 180                                         exit(1);
 181                                 }
 182                                 if (groupFound == NULL) {
 183                                         fprintf(stderr, "Error: Specified group \"%s\" doesn't "
 184                                                 "exist.\n", group);
 185                                         exit(1);
 186                                 }
 187
 188                                 gid = groupFound->gr_gid;
 189                                 break;
 190                         }
 191                 }
 192         }
 193
 194         // find an unused UID
 195         uid_t uid = 1000;
 196         while (getpwuid(uid) != NULL)
 197                 uid++;
 198
 199         // prepare request for the registrar
 200         KMessage message(BPrivate::B_REG_UPDATE_USER);
 201         if (message.AddInt32("uid", uid) != B_OK
 202                 || message.AddInt32("gid", gid) != B_OK
 203                 || message.AddString("name", user) != B_OK
 204                 || message.AddString("password", "x") != B_OK
 205                 || message.AddString("home", home) != B_OK
 206                 || message.AddString("shell", shell) != B_OK
 207                 || message.AddString("real name", realName) != B_OK
 208                 || message.AddString("shadow password", "!") != B_OK
 209                 || message.AddInt32("last changed", time(NULL)) != B_OK
 210                 || message.AddInt32("min", min) != B_OK
 211                 || message.AddInt32("max", max) != B_OK
 212                 || message.AddInt32("warn", warn) != B_OK
 213                 || message.AddInt32("inactive", inactive) != B_OK
 214                 || message.AddInt32("expiration", expiration) != B_OK
 215                 || message.AddInt32("flags", 0) != B_OK
 216                 || message.AddBool("add user", true) != B_OK) {
 217                 fprintf(stderr, "Error: Out of memory!\n");
 218                 exit(1);
 219         }
 220
 221         // send the request
 222         KMessage reply;
 223         status_t error = send_authentication_request_to_registrar(message, reply);
 224         if (error != B_OK) {
 225                 fprintf(stderr, "Error: Failed to create user: %s\n", strerror(error));
 226                 exit(1);
 227         }
 228
 229         return 0;
 230 }