pw/pw_user.c

   1 /*-
   2  * Copyright (C) 1996
   3  *      David L. Nugent.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  *      $Id: pw_user.c,v 1.5 1996/12/17 14:15:35 davidn Exp $
  27  */
  28
  29 #include <unistd.h>
  30 #include <fcntl.h>
  31 #include <ctype.h>
  32 #include <paths.h>
  33 #include <sys/param.h>
  34 #include <dirent.h>
  35 #include <termios.h>
  36 #include <sys/types.h>
  37 #include <sys/time.h>
  38 #include <sys/resource.h>
  39 #include <md5.h>
  40 #include "pw.h"
  41 #include "bitmap.h"
  42 #include "pwupd.h"
  43
  44 static int      print_user(struct passwd * pwd, int pretty);
  45 static uid_t    pw_uidpolicy(struct userconf * cnf, struct cargs * args);
  46 static uid_t    pw_gidpolicy(struct userconf * cnf, struct cargs * args, char *nam, gid_t prefer);
  47 static time_t   pw_pwdpolicy(struct userconf * cnf, struct cargs * args);
  48 static time_t   pw_exppolicy(struct userconf * cnf, struct cargs * args);
  49 static char    *pw_homepolicy(struct userconf * cnf, struct cargs * args, char const * user);
  50 static char    *pw_shellpolicy(struct userconf * cnf, struct cargs * args, char *newshell);
  51 static char    *pw_password(struct userconf * cnf, struct cargs * args, char const * user);
  52 static char    *shell_path(char const * path, char *shells[], char *sh);
  53 static void     rmat(uid_t uid);
  54
  55 /*-
  56  * -C config      configuration file
  57  * -q             quiet operation
  58  * -n name        login name
  59  * -u uid         user id
  60  * -c comment     user name/comment
  61  * -d directory   home directory
  62  * -e date        account expiry date
  63  * -p date        password expiry date
  64  * -g grp         primary group
  65  * -G grp1,grp2   additional groups
  66  * -m [ -k dir ]  create and set up home
  67  * -s shell       name of login shell
  68  * -o             duplicate uid ok
  69  * -L class       user class
  70  * -l name        new login name
  71  * -h fd          password filehandle
  72  * -F             force print or add
  73  *   Setting defaults:
  74  * -D             set user defaults
  75  * -b dir         default home root dir
  76  * -e period      default expiry period
  77  * -p period      default password change period
  78  * -g group       default group
  79  * -G             grp1,grp2.. default additional groups
  80  * -L class       default login class
  81  * -k dir         default home skeleton
  82  * -s shell       default shell
  83  * -w method      default password method
  84  */
  85
  86 int
  87 pw_user(struct userconf * cnf, int mode, struct cargs * args)
  88 {
  89         char           *p = NULL;
  90         struct carg    *a_name;
  91         struct carg    *a_uid;
  92         struct carg    *arg;
  93         struct passwd  *pwd = NULL;
  94         struct group   *grp;
  95         struct stat     st;
  96         char            line[MAXPWLINE];
  97
  98         static struct passwd fakeuser =
  99         {
 100                 NULL,
 101                 "*",
 102                 -1,
 103                 -1,
 104                 0,
 105                 "",
 106                 "User &",
 107                 "/bin/sh",
 108                 0,
 109                 0
 110         };
 111
 112         /*
 113          * With M_NEXT, we only need to return the
 114          * next uid to stdout
 115          */
 116         if (mode == M_NEXT)
 117         {
 118                 uid_t next = pw_uidpolicy(cnf, args);
 119                 if (getarg(args, 'q'))
 120                         return next;
 121                 printf("%ld:", (long)next);
 122                 pw_group(cnf, mode, args);
 123                 return EXIT_SUCCESS;
 124         }
 125
 126         /*
 127          * We can do all of the common legwork here
 128          */
 129
 130         if ((arg = getarg(args, 'b')) != NULL) {
 131                 cnf->home = arg->val;
 132                 if (stat(cnf->home, &st) == -1 || !S_ISDIR(st.st_mode))
 133                         cmderr(EX_OSFILE, "root home `%s' is not a directory or does not exist\n", cnf->home);
 134         }
 135         if ((arg = getarg(args, 'e')) != NULL)
 136                 cnf->expire_days = atoi(arg->val);
 137
 138         if ((arg = getarg(args, 'p')) != NULL && arg->val)
 139                 cnf->password_days = atoi(arg->val);
 140
 141         if ((arg = getarg(args, 'g')) != NULL) {
 142                 p = arg->val;
 143                 if ((grp = getgrnam(p)) == NULL) {
 144                         if (!isdigit(*p) || (grp = getgrgid((gid_t) atoi(p))) == NULL)
 145                                 cmderr(EX_NOUSER, "group `%s' does not exist\n", p);
 146                 }
 147                 cnf->default_group = newstr(grp->gr_name);
 148         }
 149         if ((arg = getarg(args, 'L')) != NULL)
 150                 cnf->default_class = pw_checkname((u_char *)arg->val, 0);
 151
 152         if ((arg = getarg(args, 'G')) != NULL && arg->val) {
 153                 int             i = 0;
 154
 155                 for (p = strtok(arg->val, ", \t"); i < _UC_MAXGROUPS && p != NULL; p = strtok(NULL, ", \t")) {
 156                         if ((grp = getgrnam(p)) == NULL) {
 157                                 if (!isdigit(*p) || (grp = getgrgid((gid_t) atoi(p))) == NULL)
 158                                         cmderr(EX_NOUSER, "group `%s' does not exist\n", p);
 159                         }
 160                         cnf->groups[i++] = newstr(grp->gr_name);
 161                 }
 162                 while (i < _UC_MAXGROUPS)
 163                         cnf->groups[i++] = NULL;
 164         }
 165         if ((arg = getarg(args, 'k')) != NULL) {
 166                 if (stat(cnf->dotdir = arg->val, &st) == -1 || S_ISDIR(st.st_mode))
 167                         cmderr(EX_OSFILE, "skeleton `%s' is not a directory or does not exist\n", cnf->dotdir);
 168         }
 169         if ((arg = getarg(args, 's')) != NULL)
 170                 cnf->shell_default = arg->val;
 171
 172         if (mode == M_ADD && getarg(args, 'D')) {
 173                 if (getarg(args, 'n') != NULL)
 174                         cmderr(EX_DATAERR, "can't combine `-D' with `-n name'\n");
 175                 if ((arg = getarg(args, 'u')) != NULL && (p = strtok(arg->val, ", \t")) != NULL) {
 176                         if ((cnf->min_uid = (uid_t) atoi(p)) == 0)
 177                                 cnf->min_uid = 1000;
 178                         if ((p = strtok(NULL, " ,\t")) == NULL || (cnf->max_uid = (uid_t) atoi(p)) < cnf->min_uid)
 179                                 cnf->max_uid = 32000;
 180                 }
 181                 if ((arg = getarg(args, 'i')) != NULL && (p = strtok(arg->val, ", \t")) != NULL) {
 182                         if ((cnf->min_gid = (gid_t) atoi(p)) == 0)
 183                                 cnf->min_gid = 1000;
 184                         if ((p = strtok(NULL, " ,\t")) == NULL || (cnf->max_gid = (gid_t) atoi(p)) < cnf->min_gid)
 185                                 cnf->max_gid = 32000;
 186                 }
 187                 if ((arg = getarg(args, 'w')) != NULL)
 188                         cnf->default_password = boolean_val(arg->val, cnf->default_password);
 189
 190                 arg = getarg(args, 'C');
 191                 if (write_userconfig(arg ? arg->val : NULL))
 192                         return EXIT_SUCCESS;
 193                 perror("config update");
 194                 return EX_IOERR;
 195         }
 196         if (mode == M_PRINT && getarg(args, 'a')) {
 197                 int             pretty = getarg(args, 'P') != NULL;
 198
 199                 setpwent();
 200                 while ((pwd = getpwent()) != NULL)
 201                         print_user(pwd, pretty);
 202                 endpwent();
 203                 return EXIT_SUCCESS;
 204         }
 205         if ((a_name = getarg(args, 'n')) != NULL)
 206                 pwd = getpwnam(pw_checkname((u_char *)a_name->val, 0));
 207         a_uid = getarg(args, 'u');
 208
 209         if (a_uid == NULL) {
 210                 if (a_name == NULL)
 211                         cmderr(EX_DATAERR, "user name or id required\n");
 212
 213                 /*
 214                  * Determine whether 'n' switch is name or uid - we don't
 215                  * really don't really care which we have, but we need to
 216                  * know.
 217                  */
 218                 if (mode != M_ADD && pwd == NULL && isdigit(*a_name->val) && atoi(a_name->val) > 0) {   /* Assume uid */
 219                         (a_uid = a_name)->ch = 'u';
 220                         a_name = NULL;
 221                 }
 222         }
 223         /*
 224          * Update, delete & print require that the user exists
 225          */
 226         if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
 227                 if (a_name == NULL && pwd == NULL)      /* Try harder */
 228                         pwd = getpwuid(atoi(a_uid->val));
 229
 230                 if (pwd == NULL) {
 231                         if (mode == M_PRINT && getarg(args, 'F')) {
 232                                 fakeuser.pw_name = a_name ? a_name->val : "nouser";
 233                                 fakeuser.pw_uid = a_uid ? (uid_t) atol(a_uid->val) : -1;
 234                                 return print_user(&fakeuser, getarg(args, 'P') != NULL);
 235                         }
 236                         if (a_name == NULL)
 237                                 cmderr(EX_NOUSER, "no such uid `%s'\n", a_uid->val);
 238                         cmderr(EX_NOUSER, "no such user `%s'\n", a_name->val);
 239                 }
 240                 if (a_name == NULL)     /* May be needed later */
 241                         a_name = addarg(args, 'n', newstr(pwd->pw_name));
 242
 243                 /*
 244                  * Handle deletions now
 245                  */
 246                 if (mode == M_DELETE) {
 247                         char            file[MAXPATHLEN];
 248                         char            home[MAXPATHLEN];
 249                         uid_t           uid = pwd->pw_uid;
 250
 251                         if (strcmp(pwd->pw_name, "root") == 0)
 252                                 cmderr(EX_DATAERR, "cannot remove user 'root'\n");
 253
 254                         /*
 255                          * Remove crontabs
 256                          */
 257                         sprintf(file, "/var/cron/tabs/%s", pwd->pw_name);
 258                         if (access(file, F_OK) == 0) {
 259                                 sprintf(file, "crontab -u %s -r", pwd->pw_name);
 260                                 system(file);
 261                         }
 262                         /*
 263                          * Save these for later, since contents of pwd may be
 264                          * invalidated by deletion
 265                          */
 266                         sprintf(file, "%s/%s", _PATH_MAILDIR, pwd->pw_name);
 267                         strncpy(home, pwd->pw_dir, sizeof home);
 268                         home[sizeof home - 1] = '\0';
 269
 270                         if (!delpwent(pwd))
 271                                 cmderr(EX_IOERR, "Error updating passwd file: %s\n", strerror(errno));
 272                         editgroups(a_name->val, NULL);
 273
 274                         pw_log(cnf, mode, W_USER, "%s(%ld) account removed", a_name->val, (long) uid);
 275
 276                         /*
 277                          * Remove mail file
 278                          */
 279                         remove(file);
 280
 281                         /*
 282                          * Remove at jobs
 283                          */
 284                         if (getpwuid(uid) == NULL)
 285                                 rmat(uid);
 286
 287                         /*
 288                          * Remove home directory and contents
 289                          */
 290                         if (getarg(args, 'r') != NULL && *home == '/' && getpwuid(uid) == NULL) {
 291                                 if (stat(home, &st) != -1) {
 292                                         rm_r(home, uid);
 293                                         pw_log(cnf, mode, W_USER, "%s(%ld) home '%s' %sremoved",
 294                                                a_name->val, (long) uid, home,
 295                                                stat(home, &st) == -1 ? "" : "not completely ");
 296                                 }
 297                         }
 298                         return EXIT_SUCCESS;
 299                 } else if (mode == M_PRINT)
 300                         return print_user(pwd, getarg(args, 'P') != NULL);
 301
 302                 /*
 303                  * The rest is edit code
 304                  */
 305                 if ((arg = getarg(args, 'l')) != NULL) {
 306                         if (strcmp(pwd->pw_name, "root") == 0)
 307                                 cmderr(EX_DATAERR, "can't rename `root' account\n");
 308                         pwd->pw_name = pw_checkname((u_char *)arg->val, 0);
 309                 }
 310                 if ((arg = getarg(args, 'u')) != NULL && isdigit(*arg->val)) {
 311                         pwd->pw_uid = (uid_t) atol(arg->val);
 312                         if (pwd->pw_uid != 0 && strcmp(pwd->pw_name, "root") == 0)
 313                                 cmderr(EX_DATAERR, "can't change uid of `root' account\n");
 314                         if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0)
 315                                 fprintf(stderr, "WARNING: account `%s' will have a uid of 0 (superuser access!)\n", pwd->pw_name);
 316                 }
 317                 if ((arg = getarg(args, 'g')) != NULL && pwd->pw_uid != 0)      /* Already checked this */
 318                         pwd->pw_gid = (gid_t) getgrnam(cnf->default_group)->gr_gid;
 319
 320                 if ((arg = getarg(args, 'p')) != NULL) {
 321                         if (*arg->val == '\0' || strcmp(arg->val, "0") == 0)
 322                                 pwd->pw_change = 0;
 323                         else {
 324                                 time_t          now = time(NULL);
 325                                 time_t          expire = parse_date(now, arg->val);
 326
 327                                 if (now == expire)
 328                                         cmderr(EX_DATAERR, "Invalid password change date `%s'\n", arg->val);
 329                                 pwd->pw_change = expire;
 330                         }
 331                 }
 332                 if ((arg = getarg(args, 'e')) != NULL) {
 333                         if (*arg->val == '\0' || strcmp(arg->val, "0") == 0)
 334                                 pwd->pw_expire = 0;
 335                         else {
 336                                 time_t          now = time(NULL);
 337                                 time_t          expire = parse_date(now, arg->val);
 338
 339                                 if (now == expire)
 340                                         cmderr(EX_DATAERR, "Invalid account expiry date `%s'\n", arg->val);
 341                                 pwd->pw_expire = expire;
 342                         }
 343                 }
 344                 if ((arg = getarg(args, 's')) != NULL)
 345                         pwd->pw_shell = shell_path(cnf->shelldir, cnf->shells, arg->val);
 346
 347                 if (getarg(args, 'L'))
 348                         pwd->pw_class = cnf->default_class;
 349
 350                 if ((arg = getarg(args, 'w')) != NULL && getarg(args, 'h') == NULL)
 351                         pwd->pw_passwd = pw_password(cnf, args, pwd->pw_name);
 352
 353         } else {
 354                 if (a_name == NULL)     /* Required */
 355                         cmderr(EX_DATAERR, "login name required\n");
 356                 else if ((pwd = getpwnam(a_name->val)) != NULL) /* Exists */
 357                         cmderr(EX_DATAERR, "login name `%s' already exists\n", a_name->val);
 358
 359                 /*
 360                  * Now, set up defaults for a new user
 361                  */
 362                 pwd = &fakeuser;
 363                 pwd->pw_name = a_name->val;
 364                 pwd->pw_class = cnf->default_class ? cnf->default_class : "";
 365                 pwd->pw_passwd = pw_password(cnf, args, pwd->pw_name);
 366                 pwd->pw_uid = pw_uidpolicy(cnf, args);
 367                 pwd->pw_gid = pw_gidpolicy(cnf, args, pwd->pw_name, (gid_t) pwd->pw_uid);
 368                 pwd->pw_change = pw_pwdpolicy(cnf, args);
 369                 pwd->pw_expire = pw_exppolicy(cnf, args);
 370                 pwd->pw_dir = pw_homepolicy(cnf, args, pwd->pw_name);
 371                 pwd->pw_shell = pw_shellpolicy(cnf, args, NULL);
 372
 373                 if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0)
 374                         fprintf(stderr, "WARNING: new account `%s' has a uid of 0 (superuser access!)\n", pwd->pw_name);
 375         }
 376
 377         /*
 378          * Shared add/edit code
 379          */
 380         if ((arg = getarg(args, 'c')) != NULL)
 381                 pwd->pw_gecos = pw_checkname((u_char *)arg->val, 1);
 382
 383         if ((arg = getarg(args, 'h')) != NULL) {
 384                 if (strcmp(arg->val, "-") == 0)
 385                         pwd->pw_passwd = "*";   /* No access */
 386                 else {
 387                         int             fd = atoi(arg->val);
 388                         int             b;
 389                         int             istty = isatty(fd);
 390                         struct termios  t;
 391
 392                         if (istty) {
 393                                 if (tcgetattr(fd, &t) == -1)
 394                                         istty = 0;
 395                                 else {
 396                                         struct termios  n = t;
 397
 398                                         /* Disable echo */
 399                                         n.c_lflag &= ~(ECHO);
 400                                         tcsetattr(fd, TCSANOW, &n);
 401                                         printf("%sassword for user %s:", (mode == M_UPDATE) ? "New p" : "P", pwd->pw_name);
 402                                         fflush(stdout);
 403                                 }
 404                         }
 405                         b = read(fd, line, sizeof(line) - 1);
 406                         if (istty) {    /* Restore state */
 407                                 tcsetattr(fd, TCSANOW, &t);
 408                                 fputc('\n', stdout);
 409                                 fflush(stdout);
 410                         }
 411                         if (b < 0) {
 412                                 perror("-h file descriptor");
 413                                 return EX_IOERR;
 414                         }
 415                         line[b] = '\0';
 416                         if ((p = strpbrk(line, " \t\r\n")) != NULL)
 417                                 *p = '\0';
 418                         if (!*line)
 419                                 cmderr(EX_DATAERR, "empty password read on file descriptor %d\n", fd);
 420                         pwd->pw_passwd = pw_pwcrypt(line);
 421                 }
 422         }
 423
 424         /*
 425          * Special case: -N only displays & exits
 426          */
 427         if (getarg(args, 'N') != NULL)
 428                 return print_user(pwd, getarg(args, 'P') != NULL);
 429
 430         if ((mode == M_ADD && !addpwent(pwd)) ||
 431             (mode == M_UPDATE && !chgpwent(a_name->val, pwd))) {
 432                 perror("password update");
 433                 return EX_IOERR;
 434         }
 435         /*
 436          * Ok, user is created or changed - now edit group file
 437          */
 438
 439         if (mode == M_ADD || getarg(args, 'G') != NULL)
 440                 editgroups(pwd->pw_name, cnf->groups);
 441
 442         /* pwd may have been invalidated */
 443         if ((pwd = getpwnam(a_name->val)) == NULL)
 444                 cmderr(EX_NOUSER, "user '%s' disappeared during update\n", a_name->val);
 445
 446         grp = getgrgid(pwd->pw_gid);
 447         pw_log(cnf, mode, W_USER, "%s(%ld):%s(%d):%s:%s:%s",
 448                pwd->pw_name, (long) pwd->pw_uid,
 449             grp ? grp->gr_name : "unknown", (long) (grp ? grp->gr_gid : -1),
 450                pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell);
 451
 452         /*
 453          * If adding, let's touch and chown the user's mail file. This is not
 454          * strictly necessary under BSD with a 0755 maildir but it also
 455          * doesn't hurt anything to create the empty mailfile
 456          */
 457         if (mode == M_ADD) {
 458                 FILE           *fp;
 459
 460                 sprintf(line, "%s/%s", _PATH_MAILDIR, pwd->pw_name);
 461                 close(open(line, O_RDWR | O_CREAT, 0600));      /* Preserve contents &
 462                                                                  * mtime */
 463                 chown(line, pwd->pw_uid, pwd->pw_gid);
 464
 465                 /*
 466                  * Send mail to the new user as well, if we are asked to
 467                  */
 468                 if (cnf->newmail && *cnf->newmail && (fp = fopen(cnf->newmail, "r")) != NULL) {
 469                         FILE           *pfp = popen(_PATH_SENDMAIL " -t", "w");
 470
 471                         if (pfp == NULL)
 472                                 perror("sendmail");
 473                         else {
 474                                 fprintf(pfp, "From: root\n" "To: %s\n" "Subject: Welcome!\n\n", pwd->pw_name);
 475                                 while (fgets(line, sizeof(line), fp) != NULL) {
 476                                         /* Do substitutions? */
 477                                         fputs(line, pfp);
 478                                 }
 479                                 pclose(pfp);
 480                                 pw_log(cnf, mode, W_USER, "%s(%ld) new user mail sent",
 481                                        pwd->pw_name, (long) pwd->pw_uid);
 482                         }
 483                         fclose(fp);
 484                 }
 485         }
 486         /*
 487          * Finally, let's create and populate the user's home directory. Note
 488          * that this also `works' for editing users if -m is used, but
 489          * existing files will *not* be overwritten.
 490          */
 491         if (getarg(args, 'm') != NULL && pwd->pw_dir && *pwd->pw_dir == '/' && pwd->pw_dir[1]) {
 492                 copymkdir(pwd->pw_dir, cnf->dotdir, 0755, pwd->pw_uid, pwd->pw_gid);
 493                 pw_log(cnf, mode, W_USER, "%s(%ld) home %s made",
 494                        pwd->pw_name, (long) pwd->pw_uid, pwd->pw_dir);
 495         }
 496         return EXIT_SUCCESS;
 497 }
 498
 499
 500 static          uid_t
 501 pw_uidpolicy(struct userconf * cnf, struct cargs * args)
 502 {
 503         struct passwd  *pwd;
 504         uid_t           uid = (uid_t) - 1;
 505         struct carg    *a_uid = getarg(args, 'u');
 506
 507         /*
 508          * Check the given uid, if any
 509          */
 510         if (a_uid != NULL) {
 511                 uid = (uid_t) atol(a_uid->val);
 512
 513                 if ((pwd = getpwuid(uid)) != NULL && getarg(args, 'o') == NULL)
 514                         cmderr(EX_DATAERR, "uid `%ld' has already been allocated\n", (long) pwd->pw_uid);
 515         } else {
 516                 struct bitmap   bm;
 517
 518                 /*
 519                  * We need to allocate the next available uid under one of
 520                  * two policies a) Grab the first unused uid b) Grab the
 521                  * highest possible unused uid
 522                  */
 523                 if (cnf->min_uid >= cnf->max_uid) {     /* Sanity
 524                                                          * claus^H^H^H^Hheck */
 525                         cnf->min_uid = 1000;
 526                         cnf->max_uid = 32000;
 527                 }
 528                 bm = bm_alloc(cnf->max_uid - cnf->min_uid + 1);
 529
 530                 /*
 531                  * Now, let's fill the bitmap from the password file
 532                  */
 533                 setpwent();
 534                 while ((pwd = getpwent()) != NULL)
 535                         if (pwd->pw_uid >= (int) cnf->min_uid && pwd->pw_uid <= (int) cnf->max_uid)
 536                                 bm_setbit(&bm, pwd->pw_uid - cnf->min_uid);
 537                 endpwent();
 538
 539                 /*
 540                  * Then apply the policy, with fallback to reuse if necessary
 541                  */
 542                 if (cnf->reuse_uids || (uid = (uid_t) (bm_lastset(&bm) + cnf->min_uid + 1)) > cnf->max_uid)
 543                         uid = (uid_t) (bm_firstunset(&bm) + cnf->min_uid);
 544
 545                 /*
 546                  * Another sanity check
 547                  */
 548                 if (uid < cnf->min_uid || uid > cnf->max_uid)
 549                         cmderr(EX_SOFTWARE, "unable to allocate a new uid - range fully used\n");
 550                 bm_dealloc(&bm);
 551         }
 552         return uid;
 553 }
 554
 555
 556 static          uid_t
 557 pw_gidpolicy(struct userconf * cnf, struct cargs * args, char *nam, gid_t prefer)
 558 {
 559         struct group   *grp;
 560         gid_t           gid = (uid_t) - 1;
 561         struct carg    *a_gid = getarg(args, 'g');
 562
 563         /*
 564          * If no arg given, see if default can help out
 565          */
 566         if (a_gid == NULL && cnf->default_group && *cnf->default_group)
 567                 a_gid = addarg(args, 'g', cnf->default_group);
 568
 569         /*
 570          * Check the given gid, if any
 571          */
 572         setgrent();
 573         if (a_gid != NULL) {
 574                 if ((grp = getgrnam(a_gid->val)) == NULL) {
 575                         gid = (gid_t) atol(a_gid->val);
 576                         if ((gid == 0 && !isdigit(*a_gid->val)) || (grp = getgrgid(gid)) == NULL)
 577                                 cmderr(EX_NOUSER, "group `%s' is not defined\n", a_gid->val);
 578                 }
 579                 gid = grp->gr_gid;
 580         } else if ((grp = getgrnam(nam)) != NULL && grp->gr_mem[0] == NULL) {
 581                 gid = grp->gr_gid;  /* Already created? Use it anyway... */
 582         } else {
 583                 struct cargs    grpargs;
 584                 char            tmp[32];
 585
 586                 LIST_INIT(&grpargs);
 587                 addarg(&grpargs, 'n', nam);
 588
 589                 /*
 590                  * We need to auto-create a group with the user's name. We
 591                  * can send all the appropriate output to our sister routine
 592                  * bit first see if we can create a group with gid==uid so we
 593                  * can keep the user and group ids in sync. We purposely do
 594                  * NOT check the gid range if we can force the sync. If the
 595                  * user's name dups an existing group, then the group add
 596                  * function will happily handle that case for us and exit.
 597                  */
 598                 if (getgrgid(prefer) == NULL) {
 599                         sprintf(tmp, "%lu", (unsigned long) prefer);
 600                         addarg(&grpargs, 'g', tmp);
 601                 }
 602                 if (getarg(args, 'N'))
 603                 {
 604                         addarg(&grpargs, 'N', NULL);
 605                         addarg(&grpargs, 'q', NULL);
 606                         gid = pw_group(cnf, M_NEXT, &grpargs);
 607                 }
 608                 else
 609                 {
 610                         pw_group(cnf, M_ADD, &grpargs);
 611                         if ((grp = getgrnam(nam)) != NULL)
 612                                 gid = grp->gr_gid;
 613                 }
 614                 a_gid = grpargs.lh_first;
 615                 while (a_gid != NULL) {
 616                         struct carg    *t = a_gid->list.le_next;
 617                         LIST_REMOVE(a_gid, list);
 618                         a_gid = t;
 619                 }
 620         }
 621         endgrent();
 622         return gid;
 623 }
 624
 625
 626 static          time_t
 627 pw_pwdpolicy(struct userconf * cnf, struct cargs * args)
 628 {
 629         time_t          result = 0;
 630         time_t          now = time(NULL);
 631         struct carg    *arg = getarg(args, 'e');
 632
 633         if (arg != NULL) {
 634                 if ((result = parse_date(now, arg->val)) == now)
 635                         cmderr(EX_DATAERR, "invalid date/time `%s'\n", arg->val);
 636         } else if (cnf->password_days > 0)
 637                 result = now + ((long) cnf->password_days * 86400L);
 638         return result;
 639 }
 640
 641
 642 static          time_t
 643 pw_exppolicy(struct userconf * cnf, struct cargs * args)
 644 {
 645         time_t          result = 0;
 646         time_t          now = time(NULL);
 647         struct carg    *arg = getarg(args, 'e');
 648
 649         if (arg != NULL) {
 650                 if ((result = parse_date(now, arg->val)) == now)
 651                         cmderr(EX_DATAERR, "invalid date/time `%s'\n", arg->val);
 652         } else if (cnf->expire_days > 0)
 653                 result = now + ((long) cnf->expire_days * 86400L);
 654         return result;
 655 }
 656
 657
 658 static char    *
 659 pw_homepolicy(struct userconf * cnf, struct cargs * args, char const * user)
 660 {
 661         struct carg    *arg = getarg(args, 'd');
 662
 663         if (arg)
 664                 return arg->val;
 665         else {
 666                 static char     home[128];
 667
 668                 if (cnf->home == NULL || *cnf->home == '\0')
 669                         cmderr(EX_CONFIG, "no base home directory set\n");
 670                 sprintf(home, "%s/%s", cnf->home, user);
 671                 return home;
 672         }
 673 }
 674
 675 static char    *
 676 shell_path(char const * path, char *shells[], char *sh)
 677 {
 678         if (sh != NULL && (*sh == '/' || *sh == '\0'))
 679                 return sh;      /* specified full path or forced none */
 680         else {
 681                 char           *p;
 682                 char            paths[_UC_MAXLINE];
 683
 684                 /*
 685                  * We need to search paths
 686                  */
 687                 strncpy(paths, path, sizeof paths);
 688                 paths[sizeof paths - 1] = '\0';
 689                 for (p = strtok(paths, ": \t\r\n"); p != NULL; p = strtok(NULL, ": \t\r\n")) {
 690                         int             i;
 691                         static char     shellpath[256];
 692
 693                         if (sh != NULL) {
 694                                 sprintf(shellpath, "%s/%s", p, sh);
 695                                 if (access(shellpath, X_OK) == 0)
 696                                         return shellpath;
 697                         } else
 698                                 for (i = 0; i < _UC_MAXSHELLS && shells[i] != NULL; i++) {
 699                                         sprintf(shellpath, "%s/%s", p, shells[i]);
 700                                         if (access(shellpath, X_OK) == 0)
 701                                                 return shellpath;
 702                                 }
 703                 }
 704                 if (sh == NULL)
 705                         cmderr(EX_OSFILE, "can't find shell `%s' in shell paths\n", sh);
 706                 cmderr(EX_CONFIG, "no default shell available or defined\n");
 707                 return NULL;
 708         }
 709 }
 710
 711
 712 static char    *
 713 pw_shellpolicy(struct userconf * cnf, struct cargs * args, char *newshell)
 714 {
 715         char           *sh = newshell;
 716         struct carg    *arg = getarg(args, 's');
 717
 718         if (newshell == NULL && arg != NULL)
 719                 sh = arg->val;
 720         return shell_path(cnf->shelldir, cnf->shells, sh ? sh : cnf->shell_default);
 721 }
 722
 723 static char const chars[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ.";
 724
 725 char           *
 726 pw_pwcrypt(char *password)
 727 {
 728         int             i;
 729         char            salt[12];
 730
 731         static char     buf[256];
 732
 733         /*
 734          * Calculate a salt value
 735          */
 736         srandom((unsigned) (time(NULL) ^ getpid()));
 737         for (i = 0; i < 8; i++)
 738                 salt[i] = chars[random() % 63];
 739         salt[i] = '\0';
 740
 741         return strcpy(buf, crypt(password, salt));
 742 }
 743
 744 #if defined(__FreeBSD__)
 745
 746 #if defined(USE_MD5RAND)
 747 u_char *
 748 pw_getrand(u_char *buf, int len)        /* cryptographically secure rng */
 749 {
 750         int i;
 751         for (i=0;i<len;i+=16) {
 752                 u_char ubuf[16];
 753
 754                 MD5_CTX md5_ctx;
 755                 struct timeval tv, tvo;
 756                 struct rusage ru;
 757                 int n=0;
 758                 int t;
 759
 760                 MD5Init (&md5_ctx);
 761                 t=getpid();
 762                 MD5Update (&md5_ctx, (u_char*)&t, sizeof t);
 763                 t=getppid();
 764                 MD5Update (&md5_ctx, (u_char*)&t, sizeof t);
 765                 gettimeofday (&tvo, NULL);
 766                 do {
 767                         getrusage (RUSAGE_SELF, &ru);
 768                         MD5Update (&md5_ctx, (u_char*)&ru, sizeof ru);
 769                         gettimeofday (&tv, NULL);
 770                         MD5Update (&md5_ctx, (u_char*)&tv, sizeof tv);
 771                 } while (n++<20 || tv.tv_usec-tvo.tv_usec<100*1000);
 772                 MD5Final (ubuf, &md5_ctx);
 773                 memcpy(buf+i, ubuf, MIN(16, len-n));
 774         }
 775         return buf;
 776 }
 777
 778 #else   /* Use random device (preferred) */
 779
 780 static u_char *
 781 pw_getrand(u_char *buf, int len)
 782 {
 783         int             fd;
 784         fd = open("/dev/urandom", O_RDONLY);
 785         if (fd==-1)
 786                 cmderr(EX_OSFILE, "can't open /dev/urandom: %s\n", strerror(errno));
 787         else if (read(fd, buf, len)!=len)
 788                 cmderr(EX_IOERR, "read error on /dev/urandom\n");
 789         close(fd);
 790         return buf;
 791 }
 792
 793 #endif
 794
 795 #else   /* Portable version */
 796
 797 static u_char *
 798 pw_getrand(u_char *buf, int len)
 799 {
 800         int i;
 801
 802         for (i = 0; i < len; i++) {
 803                 unsigned val = random();
 804                 /* Use all bits in the random value */
 805                 buf[i]=(u_char)((val >> 24) ^ (val >> 16) ^ (val >> 8) ^ val);
 806         }
 807         return buf;
 808 }
 809
 810 #endif
 811
 812 static char    *
 813 pw_password(struct userconf * cnf, struct cargs * args, char const * user)
 814 {
 815         int             i, l;
 816         char            pwbuf[32];
 817         u_char          rndbuf[sizeof pwbuf];
 818
 819         switch (cnf->default_password) {
 820         case -1:                /* Random password */
 821                 srandom((unsigned) (time(NULL) ^ getpid()));
 822                 l = (random() % 8 + 8); /* 8 - 16 chars */
 823                 pw_getrand(rndbuf, l);
 824                 for (i = 0; i < l; i++)
 825                         pwbuf[i] = chars[rndbuf[i] % sizeof(chars)];
 826                 pwbuf[i] = '\0';
 827
 828                 /*
 829                  * We give this information back to the user
 830                  */
 831                 if (getarg(args, 'h') == NULL && getarg(args, 'N') == NULL) {
 832                         if (isatty(0))
 833                                 printf("Password is: ");
 834                         printf("%s\n", pwbuf);
 835                         fflush(stdout);
 836                 }
 837                 break;
 838
 839         case -2:                /* No password at all! */
 840                 return "";
 841
 842         case 0:         /* No login - default */
 843         default:
 844                 return "*";
 845
 846         case 1:         /* user's name */
 847                 strncpy(pwbuf, user, sizeof pwbuf);
 848                 pwbuf[sizeof pwbuf - 1] = '\0';
 849                 break;
 850         }
 851         return pw_pwcrypt(pwbuf);
 852 }
 853
 854
 855 static int
 856 print_user(struct passwd * pwd, int pretty)
 857 {
 858         if (!pretty) {
 859                 char            buf[_UC_MAXLINE];
 860
 861                 fmtpwent(buf, pwd);
 862                 fputs(buf, stdout);
 863         } else {
 864                 int             j;
 865                 char           *p;
 866                 struct group   *grp = getgrgid(pwd->pw_gid);
 867                 char            uname[60] = "User &", office[60] = "[None]",
 868                                 wphone[60] = "[None]", hphone[60] = "[None]";
 869                 char            acexpire[32] = "[None]", pwexpire[32] = "[None]";
 870                 struct tm *    tptr;
 871
 872                 if ((p = strtok(pwd->pw_gecos, ",")) != NULL) {
 873                         strncpy(uname, p, sizeof uname);
 874                         uname[sizeof uname - 1] = '\0';
 875                         if ((p = strtok(NULL, ",")) != NULL) {
 876                                 strncpy(office, p, sizeof office);
 877                                 office[sizeof office - 1] = '\0';
 878                                 if ((p = strtok(NULL, ",")) != NULL) {
 879                                         strncpy(wphone, p, sizeof wphone);
 880                                         wphone[sizeof wphone - 1] = '\0';
 881                                         if ((p = strtok(NULL, "")) != NULL) {
 882                                                 strncpy(hphone, p, sizeof hphone);
 883                                                 hphone[sizeof hphone - 1] = '\0';
 884                                         }
 885                                 }
 886                         }
 887                 }
 888                 /*
 889                  * Handle '&' in gecos field
 890                  */
 891                 if ((p = strchr(uname, '&')) != NULL) {
 892                         int             l = strlen(pwd->pw_name);
 893                         int             m = strlen(p);
 894
 895                         memmove(p + l, p + 1, m);
 896                         memmove(p, pwd->pw_name, l);
 897                         *p = (char) toupper(*p);
 898                 }
 899                 if (pwd->pw_expire > (time_t)0 && (tptr = localtime(&pwd->pw_expire)) != NULL)
 900                   strftime(acexpire, sizeof acexpire, "%c", tptr);
 901                 if (pwd->pw_change > (time_t)9 && (tptr = localtime(&pwd->pw_change)) != NULL)
 902                   strftime(pwexpire, sizeof pwexpire, "%c", tptr);
 903                 printf("Login Name : %-10s   #%-22ld  Group : %-10s   #%ld\n"
 904                        " Full Name : %s\n"
 905                        "      Home : %-32.32s      Class : %s\n"
 906                        "     Shell : %-32.32s     Office : %s\n"
 907                        "Work Phone : %-32.32s Home Phone : %s\n"
 908                        "Acc Expire : %-32.32s Pwd Expire : %s\n",
 909                        pwd->pw_name, (long) pwd->pw_uid,
 910                        grp ? grp->gr_name : "(invalid)", (long) pwd->pw_gid,
 911                        uname, pwd->pw_dir, pwd->pw_class,
 912                        pwd->pw_shell, office, wphone, hphone,
 913                        acexpire, pwexpire);
 914                 setgrent();
 915                 j = 0;
 916                 while ((grp=getgrent()) != NULL)
 917                 {
 918                         int     i = 0;
 919                         while (i < _UC_MAXGROUPS && grp->gr_mem[i] != NULL)
 920                         {
 921                                 if (strcmp(grp->gr_mem[i], pwd->pw_name)==0)
 922                                 {
 923                                         printf(j++ == 0 ? "    Groups : %s" : ",%s", grp->gr_name);
 924                                         break;
 925                                 }
 926                                 ++i;
 927                         }
 928                 }
 929                 endgrent();
 930                 printf("%s\n", j ? "\n" : "");
 931         }
 932         return EXIT_SUCCESS;
 933 }
 934
 935 char    *
 936 pw_checkname(u_char *name, int gecos)
 937 {
 938         int             l = 0;
 939         char const     *notch = gecos ? ":" : " ,\t:+-&#%$^()!@~*?<>=|\\/\"";
 940
 941         while (name[l]) {
 942                 if (strchr(notch, name[l]) != NULL || name[l] < ' ' ||
 943                         name[l] == 127 || (!gecos && name[l] & 0x80))   /* 8-bit */
 944                         cmderr(EX_DATAERR, (name[l]<' ' || name[l] > 126)
 945                                             ? "invalid character `%c' in field\n"
 946                                             : "invalid character 0x$02x in field\n",
 947                                             name[l]);
 948                 ++l;
 949         }
 950         if (!gecos && l > MAXLOGNAME)
 951                 cmderr(EX_DATAERR, "name too long `%s'\n", name);
 952         return (char *)name;
 953 }
 954
 955
 956 static void
 957 rmat(uid_t uid)
 958 {
 959         DIR            *d = opendir("/var/at/jobs");
 960
 961         if (d != NULL) {
 962                 struct dirent  *e;
 963
 964                 while ((e = readdir(d)) != NULL) {
 965                         struct stat     st;
 966
 967                         if (strncmp(e->d_name, ".lock", 5) != 0 &&
 968                             stat(e->d_name, &st) == 0 &&
 969                             !S_ISDIR(st.st_mode) &&
 970                             st.st_uid == uid) {
 971                                 char            tmp[MAXPATHLEN];
 972
 973                                 sprintf(tmp, "/usr/bin/atrm %s", e->d_name);
 974                                 system(tmp);
 975                         }
 976                 }
 977                 closedir(d);
 978         }
 979 }