usr.sbin/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  * $FreeBSD: src/usr.sbin/pw/pw_user.c,v 1.72 2012/02/22 06:27:20 kevlo Exp $
  27  */
  28
  29 #include <ctype.h>
  30 #include <err.h>
  31 #include <fcntl.h>
  32 #include <sys/param.h>
  33 #include <dirent.h>
  34 #include <paths.h>
  35 #include <termios.h>
  36 #include <sys/types.h>
  37 #include <sys/time.h>
  38 #include <sys/resource.h>
  39 #include <unistd.h>
  40 #include <login_cap.h>
  41 #include "pw.h"
  42 #include "bitmap.h"
  43
  44 #define LOGNAMESIZE (MAXLOGNAME-1)
  45
  46 static          char locked_str[] = "*LOCKED*";
  47
  48 static int      print_user(struct passwd * pwd, int pretty, int v7);
  49 static uid_t    pw_uidpolicy(struct userconf * cnf, struct cargs * args);
  50 static uid_t    pw_gidpolicy(struct userconf * cnf, struct cargs * args, char *nam, gid_t prefer);
  51 static time_t   pw_pwdpolicy(struct userconf * cnf, struct cargs * args);
  52 static time_t   pw_exppolicy(struct userconf * cnf, struct cargs * args);
  53 static char    *pw_homepolicy(struct userconf * cnf, struct cargs * args, char const * user);
  54 static char    *pw_shellpolicy(struct userconf * cnf, struct cargs * args, char *newshell);
  55 static char    *pw_password(struct userconf * cnf, struct cargs * args, char const * user);
  56 static char    *shell_path(char const * path, char *shells[], char *sh);
  57 static void     rmat(uid_t uid);
  58
  59 /*-
  60  * -C config      configuration file
  61  * -q             quiet operation
  62  * -n name        login name
  63  * -u uid         user id
  64  * -c comment     user name/comment
  65  * -d directory   home directory
  66  * -e date        account expiry date
  67  * -p date        password expiry date
  68  * -g grp         primary group
  69  * -G grp1,grp2   additional groups
  70  * -m [ -k dir ]  create and set up home
  71  * -s shell       name of login shell
  72  * -o             duplicate uid ok
  73  * -L class       user class
  74  * -l name        new login name
  75  * -h fd          password filehandle
  76  * -H fd          encrypted password filehandle
  77  * -F             force print or add
  78  *   Setting defaults:
  79  * -D             set user defaults
  80  * -b dir         default home root dir
  81  * -e period      default expiry period
  82  * -p period      default password change period
  83  * -g group       default group
  84  * -G             grp1,grp2.. default additional groups
  85  * -L class       default login class
  86  * -k dir         default home skeleton
  87  * -s shell       default shell
  88  * -w method      default password method
  89  */
  90
  91 int
  92 pw_user(struct userconf * cnf, int mode, struct cargs * args)
  93 {
  94         int             rc, edited = 0;
  95         char           *p = NULL;
  96         char                                     *passtmp;
  97         struct carg    *a_name;
  98         struct carg    *a_uid;
  99         struct carg    *arg;
 100         struct passwd  *pwd = NULL;
 101         struct group   *grp;
 102         struct stat     st;
 103         char            line[_PASSWORD_LEN+1];
 104         FILE           *fp;
 105         char *dmode_c;
 106         void *set = NULL;
 107
 108         static struct passwd fakeuser =
 109         {
 110                 NULL,
 111                 "*",
 112                 -1,
 113                 -1,
 114                 0,
 115                 "",
 116                 "User &",
 117                 "/nonexistent",
 118                 "/bin/sh",
 119                 0
 120                 ,0
 121         };
 122
 123
 124         /*
 125          * With M_NEXT, we only need to return the
 126          * next uid to stdout
 127          */
 128         if (mode == M_NEXT)
 129         {
 130                 uid_t next = pw_uidpolicy(cnf, args);
 131                 if (getarg(args, 'q'))
 132                         return next;
 133                 printf("%ld:", (long)next);
 134                 pw_group(cnf, mode, args);
 135                 return EXIT_SUCCESS;
 136         }
 137
 138         /*
 139          * We can do all of the common legwork here
 140          */
 141
 142         if ((arg = getarg(args, 'b')) != NULL) {
 143                 cnf->home = arg->val;
 144         }
 145
 146         if ((arg = getarg(args, 'M')) != NULL) {
 147                 dmode_c = arg->val;
 148                 if ((set = setmode(dmode_c)) == NULL)
 149                         errx(EX_DATAERR, "invalid directory creation mode '%s'",
 150                             dmode_c);
 151                 cnf->homemode = getmode(set, _DEF_DIRMODE);
 152                 free(set);
 153         }
 154
 155         /*
 156          * If we'll need to use it or we're updating it,
 157          * then create the base home directory if necessary
 158          */
 159         if (arg != NULL || getarg(args, 'm') != NULL) {
 160                 int     l = strlen(cnf->home);
 161
 162                 if (l > 1 && cnf->home[l-1] == '/')     /* Shave off any trailing path delimiter */
 163                         cnf->home[--l] = '\0';
 164
 165                 if (l < 2 || *cnf->home != '/')         /* Check for absolute path name */
 166                         errx(EX_DATAERR, "invalid base directory for home '%s'", cnf->home);
 167
 168                 if (stat(cnf->home, &st) == -1) {
 169                         char    dbuf[MAXPATHLEN];
 170
 171                         /*
 172                          * This is a kludge especially for Joerg :)
 173                          * If the home directory would be created in the root partition, then
 174                          * we really create it under /usr which is likely to have more space.
 175                          * But we create a symlink from cnf->home -> "/usr" -> cnf->home
 176                          */
 177                         if (strchr(cnf->home+1, '/') == NULL) {
 178                                 strcpy(dbuf, "/usr");
 179                                 strncat(dbuf, cnf->home, MAXPATHLEN-5);
 180                                 if (mkdir(dbuf, _DEF_DIRMODE) != -1 || errno == EEXIST) {
 181                                         chown(dbuf, 0, 0);
 182                                         /*
 183                                          * Skip first "/" and create symlink:
 184                                          * /home -> usr/home
 185                                          */
 186                                         symlink(dbuf+1, cnf->home);
 187                                 }
 188                                 /* If this falls, fall back to old method */
 189                         }
 190                         strlcpy(dbuf, cnf->home, sizeof(dbuf));
 191                         p = dbuf;
 192                         if (stat(dbuf, &st) == -1) {
 193                                 while ((p = strchr(++p, '/')) != NULL) {
 194                                         *p = '\0';
 195                                         if (stat(dbuf, &st) == -1) {
 196                                                 if (mkdir(dbuf, _DEF_DIRMODE) == -1)
 197                                                         goto direrr;
 198                                                 chown(dbuf, 0, 0);
 199                                         } else if (!S_ISDIR(st.st_mode))
 200                                                 errx(EX_OSFILE, "'%s' (root home parent) is not a directory", dbuf);
 201                                         *p = '/';
 202                                 }
 203                         }
 204                         if (stat(dbuf, &st) == -1) {
 205                                 if (mkdir(dbuf, _DEF_DIRMODE) == -1) {
 206                                 direrr: err(EX_OSFILE, "mkdir '%s'", dbuf);
 207                                 }
 208                                 chown(dbuf, 0, 0);
 209                         }
 210                 } else if (!S_ISDIR(st.st_mode))
 211                         errx(EX_OSFILE, "root home `%s' is not a directory", cnf->home);
 212         }
 213
 214         if ((arg = getarg(args, 'e')) != NULL)
 215                 cnf->expire_days = atoi(arg->val);
 216
 217         if ((arg = getarg(args, 'y')) != NULL)
 218                 cnf->nispasswd = arg->val;
 219
 220         if ((arg = getarg(args, 'p')) != NULL && arg->val)
 221                 cnf->password_days = atoi(arg->val);
 222
 223         if ((arg = getarg(args, 'g')) != NULL) {
 224                 if (!*(p = arg->val))   /* Handle empty group list specially */
 225                         cnf->default_group = "";
 226                 else {
 227                         if ((grp = GETGRNAM(p)) == NULL) {
 228                                 if (!isdigit((unsigned char)*p) || (grp = GETGRGID((gid_t) atoi(p))) == NULL)
 229                                         errx(EX_NOUSER, "group `%s' does not exist", p);
 230                         }
 231                         cnf->default_group = newstr(grp->gr_name);
 232                 }
 233         }
 234         if ((arg = getarg(args, 'L')) != NULL)
 235                 cnf->default_class = pw_checkname((u_char *)arg->val, 0);
 236
 237         if ((arg = getarg(args, 'G')) != NULL && arg->val) {
 238                 int i = 0;
 239
 240                 for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
 241                         if ((grp = GETGRNAM(p)) == NULL) {
 242                                 if (!isdigit((unsigned char)*p) || (grp = GETGRGID((gid_t) atoi(p))) == NULL)
 243                                         errx(EX_NOUSER, "group `%s' does not exist", p);
 244                         }
 245                         if (extendarray(&cnf->groups, &cnf->numgroups, i + 2) != -1)
 246                                 cnf->groups[i++] = newstr(grp->gr_name);
 247                 }
 248                 while (i < cnf->numgroups)
 249                         cnf->groups[i++] = NULL;
 250         }
 251
 252         if ((arg = getarg(args, 'k')) != NULL) {
 253                 if (stat(cnf->dotdir = arg->val, &st) == -1 || !S_ISDIR(st.st_mode))
 254                         errx(EX_OSFILE, "skeleton `%s' is not a directory or does not exist", cnf->dotdir);
 255         }
 256
 257         if ((arg = getarg(args, 's')) != NULL)
 258                 cnf->shell_default = arg->val;
 259
 260         if ((arg = getarg(args, 'w')) != NULL)
 261                 cnf->default_password = boolean_val(arg->val, cnf->default_password);
 262         if (mode == M_ADD && getarg(args, 'D')) {
 263                 if (getarg(args, 'n') != NULL)
 264                         errx(EX_DATAERR, "can't combine `-D' with `-n name'");
 265                 if ((arg = getarg(args, 'u')) != NULL && (p = strtok(arg->val, ", \t")) != NULL) {
 266                         if ((cnf->min_uid = (uid_t) atoi(p)) == 0)
 267                                 cnf->min_uid = 1000;
 268                         if ((p = strtok(NULL, " ,\t")) == NULL || (cnf->max_uid = (uid_t) atoi(p)) < cnf->min_uid)
 269                                 cnf->max_uid = 32000;
 270                 }
 271                 if ((arg = getarg(args, 'i')) != NULL && (p = strtok(arg->val, ", \t")) != NULL) {
 272                         if ((cnf->min_gid = (gid_t) atoi(p)) == 0)
 273                                 cnf->min_gid = 1000;
 274                         if ((p = strtok(NULL, " ,\t")) == NULL || (cnf->max_gid = (gid_t) atoi(p)) < cnf->min_gid)
 275                                 cnf->max_gid = 32000;
 276                 }
 277
 278                 arg = getarg(args, 'C');
 279                 if (write_userconfig(arg ? arg->val : NULL))
 280                         return EXIT_SUCCESS;
 281                 warn("config update");
 282                 return EX_IOERR;
 283         }
 284
 285         if (mode == M_PRINT && getarg(args, 'a')) {
 286                 int             pretty = getarg(args, 'P') != NULL;
 287                 int             v7 = getarg(args, '7') != NULL;
 288
 289                 SETPWENT();
 290                 while ((pwd = GETPWENT()) != NULL)
 291                         print_user(pwd, pretty, v7);
 292                 ENDPWENT();
 293                 return EXIT_SUCCESS;
 294         }
 295
 296         if ((a_name = getarg(args, 'n')) != NULL)
 297                 pwd = GETPWNAM(pw_checkname((u_char *)a_name->val, 0));
 298         a_uid = getarg(args, 'u');
 299
 300         if (a_uid == NULL) {
 301                 if (a_name == NULL)
 302                         errx(EX_DATAERR, "user name or id required");
 303
 304                 /*
 305                  * Determine whether 'n' switch is name or uid - we don't
 306                  * really don't really care which we have, but we need to
 307                  * know.
 308                  */
 309                 if (mode != M_ADD && pwd == NULL
 310                     && strspn(a_name->val, "0123456789") == strlen(a_name->val)
 311                     && atoi(a_name->val) > 0) { /* Assume uid */
 312                         (a_uid = a_name)->ch = 'u';
 313                         a_name = NULL;
 314                 }
 315         }
 316
 317         /*
 318          * Update, delete & print require that the user exists
 319          */
 320         if (mode == M_UPDATE || mode == M_DELETE ||
 321             mode == M_PRINT  || mode == M_LOCK   || mode == M_UNLOCK) {
 322
 323                 if (a_name == NULL && pwd == NULL)      /* Try harder */
 324                         pwd = GETPWUID(atoi(a_uid->val));
 325
 326                 if (pwd == NULL) {
 327                         if (mode == M_PRINT && getarg(args, 'F')) {
 328                                 fakeuser.pw_name = a_name ? a_name->val : "nouser";
 329                                 fakeuser.pw_uid = a_uid ? (uid_t) atol(a_uid->val) : -1;
 330                                 return print_user(&fakeuser,
 331                                                   getarg(args, 'P') != NULL,
 332                                                   getarg(args, '7') != NULL);
 333                         }
 334                         if (a_name == NULL)
 335                                 errx(EX_NOUSER, "no such uid `%s'", a_uid->val);
 336                         errx(EX_NOUSER, "no such user `%s'", a_name->val);
 337                 }
 338
 339                 if (a_name == NULL)     /* May be needed later */
 340                         a_name = addarg(args, 'n', newstr(pwd->pw_name));
 341
 342                 /*
 343                  * The M_LOCK and M_UNLOCK functions simply add or remove
 344                  * a "*LOCKED*" prefix from in front of the password to
 345                  * prevent it decoding correctly, and therefore prevents
 346                  * access. Of course, this only prevents access via
 347                  * password authentication (not ssh, kerberos or any
 348                  * other method that does not use the UNIX password) but
 349                  * that is a known limitation.
 350                  */
 351
 352                 if (mode == M_LOCK) {
 353                         if (strncmp(pwd->pw_passwd, locked_str, sizeof(locked_str)-1) == 0)
 354                                 errx(EX_DATAERR, "user '%s' is already locked", pwd->pw_name);
 355                         passtmp = malloc(strlen(pwd->pw_passwd) + sizeof(locked_str));
 356                         if (passtmp == NULL)    /* disaster */
 357                                 errx(EX_UNAVAILABLE, "out of memory");
 358                         strcpy(passtmp, locked_str);
 359                         strcat(passtmp, pwd->pw_passwd);
 360                         pwd->pw_passwd = passtmp;
 361                         edited = 1;
 362                 } else if (mode == M_UNLOCK) {
 363                         if (strncmp(pwd->pw_passwd, locked_str, sizeof(locked_str)-1) != 0)
 364                                 errx(EX_DATAERR, "user '%s' is not locked", pwd->pw_name);
 365                         pwd->pw_passwd += sizeof(locked_str)-1;
 366                         edited = 1;
 367                 } else if (mode == M_DELETE) {
 368                         /*
 369                          * Handle deletions now
 370                          */
 371                         char            file[MAXPATHLEN];
 372                         char            home[MAXPATHLEN];
 373                         uid_t           uid = pwd->pw_uid;
 374
 375                         if (strcmp(pwd->pw_name, "root") == 0)
 376                                 errx(EX_DATAERR, "cannot remove user 'root'");
 377
 378                         if (!PWALTDIR()) {
 379                                 /*
 380                                  * Remove crontabs
 381                                  */
 382                                 sprintf(file, "/var/cron/tabs/%s", pwd->pw_name);
 383                                 if (access(file, F_OK) == 0) {
 384                                         sprintf(file, "crontab -u %s -r", pwd->pw_name);
 385                                         system(file);
 386                                 }
 387                         }
 388                         /*
 389                          * Save these for later, since contents of pwd may be
 390                          * invalidated by deletion
 391                          */
 392                         sprintf(file, "%s/%s", _PATH_MAILDIR, pwd->pw_name);
 393                         strlcpy(home, pwd->pw_dir, sizeof(home));
 394
 395                         rc = delpwent(pwd);
 396                         if (rc == -1)
 397                                 err(EX_IOERR, "user '%s' does not exist", pwd->pw_name);
 398                         else if (rc != 0) {
 399                                 warn("passwd update");
 400                                 return EX_IOERR;
 401                         }
 402
 403                         if (cnf->nispasswd && *cnf->nispasswd=='/') {
 404                                 rc = delnispwent(cnf->nispasswd, a_name->val);
 405                                 if (rc == -1)
 406                                         warnx("WARNING: user '%s' does not exist in NIS passwd", pwd->pw_name);
 407                                 else if (rc != 0)
 408                                         warn("WARNING: NIS passwd update");
 409                                 /* non-fatal */
 410                         }
 411
 412                         editgroups(a_name->val, NULL);
 413
 414                         pw_log(cnf, mode, W_USER, "%s(%ld) account removed", a_name->val, (long) uid);
 415
 416                         if (!PWALTDIR()) {
 417                                 /*
 418                                  * Remove mail file
 419                                  */
 420                                 remove(file);
 421
 422                                 /*
 423                                  * Remove at jobs
 424                                  */
 425                                 if (getpwuid(uid) == NULL)
 426                                         rmat(uid);
 427
 428                                 /*
 429                                  * Remove home directory and contents
 430                                  */
 431                                 if (getarg(args, 'r') != NULL && *home == '/' && getpwuid(uid) == NULL) {
 432                                         if (stat(home, &st) != -1) {
 433                                                 rm_r(home, uid);
 434                                                 pw_log(cnf, mode, W_USER, "%s(%ld) home '%s' %sremoved",
 435                                                        a_name->val, (long) uid, home,
 436                                                        stat(home, &st) == -1 ? "" : "not completely ");
 437                                         }
 438                                 }
 439                         }
 440                         return EXIT_SUCCESS;
 441                 } else if (mode == M_PRINT)
 442                         return print_user(pwd,
 443                                           getarg(args, 'P') != NULL,
 444                                           getarg(args, '7') != NULL);
 445
 446                 /*
 447                  * The rest is edit code
 448                  */
 449                 if ((arg = getarg(args, 'l')) != NULL) {
 450                         if (strcmp(pwd->pw_name, "root") == 0)
 451                                 errx(EX_DATAERR, "can't rename `root' account");
 452                         pwd->pw_name = pw_checkname((u_char *)arg->val, 0);
 453                         edited = 1;
 454                 }
 455
 456                 if ((arg = getarg(args, 'u')) != NULL && isdigit((unsigned char)*arg->val)) {
 457                         pwd->pw_uid = (uid_t) atol(arg->val);
 458                         edited = 1;
 459                         if (pwd->pw_uid != 0 && strcmp(pwd->pw_name, "root") == 0)
 460                                 errx(EX_DATAERR, "can't change uid of `root' account");
 461                         if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0)
 462                                 warnx("WARNING: account `%s' will have a uid of 0 (superuser access!)", pwd->pw_name);
 463                 }
 464
 465                 if ((arg = getarg(args, 'g')) != NULL && pwd->pw_uid != 0) {    /* Already checked this */
 466                         gid_t newgid = (gid_t) GETGRNAM(cnf->default_group)->gr_gid;
 467                         if (newgid != pwd->pw_gid) {
 468                                 edited = 1;
 469                                 pwd->pw_gid = newgid;
 470                         }
 471                 }
 472
 473                 if ((arg = getarg(args, 'p')) != NULL) {
 474                         if (*arg->val == '\0' || strcmp(arg->val, "0") == 0) {
 475                                 if (pwd->pw_change != 0) {
 476                                         pwd->pw_change = 0;
 477                                         edited = 1;
 478                                 }
 479                         }
 480                         else {
 481                                 time_t          now = time(NULL);
 482                                 time_t          expire = parse_date(now, arg->val);
 483
 484                                 if (now == expire)
 485                                         errx(EX_DATAERR, "invalid password change date `%s'", arg->val);
 486                                 if (pwd->pw_change != expire) {
 487                                         pwd->pw_change = expire;
 488                                         edited = 1;
 489                                 }
 490                         }
 491                 }
 492
 493                 if ((arg = getarg(args, 'e')) != NULL) {
 494                         if (*arg->val == '\0' || strcmp(arg->val, "0") == 0) {
 495                                 if (pwd->pw_expire != 0) {
 496                                         pwd->pw_expire = 0;
 497                                         edited = 1;
 498                                 }
 499                         }
 500                         else {
 501                                 time_t          now = time(NULL);
 502                                 time_t          expire = parse_date(now, arg->val);
 503
 504                                 if (now == expire)
 505                                         errx(EX_DATAERR, "invalid account expiry date `%s'", arg->val);
 506                                 if (pwd->pw_expire != expire) {
 507                                         pwd->pw_expire = expire;
 508                                         edited = 1;
 509                                 }
 510                         }
 511                 }
 512
 513                 if ((arg = getarg(args, 's')) != NULL) {
 514                         char *shell = shell_path(cnf->shelldir, cnf->shells, arg->val);
 515                         if (shell == NULL)
 516                                 shell = "";
 517                         if (strcmp(shell, pwd->pw_shell) != 0) {
 518                                 pwd->pw_shell = shell;
 519                                 edited = 1;
 520                         }
 521                 }
 522
 523                 if (getarg(args, 'L')) {
 524                         if (cnf->default_class == NULL)
 525                                 cnf->default_class = "";
 526                         if (strcmp(pwd->pw_class, cnf->default_class) != 0) {
 527                                 pwd->pw_class = cnf->default_class;
 528                                 edited = 1;
 529                         }
 530                 }
 531
 532                 if ((arg  = getarg(args, 'd')) != NULL) {
 533                         if (strcmp(pwd->pw_dir, arg->val))
 534                                 edited = 1;
 535                         if (stat(pwd->pw_dir = arg->val, &st) == -1) {
 536                                 if (getarg(args, 'm') == NULL && strcmp(pwd->pw_dir, "/nonexistent") != 0)
 537                                   warnx("WARNING: home `%s' does not exist", pwd->pw_dir);
 538                         } else if (!S_ISDIR(st.st_mode))
 539                                 warnx("WARNING: home `%s' is not a directory", pwd->pw_dir);
 540                 }
 541
 542                 if ((arg = getarg(args, 'w')) != NULL &&
 543                     getarg(args, 'h') == NULL && getarg(args, 'H') == NULL) {
 544                         login_cap_t *lc;
 545
 546                         lc = login_getpwclass(pwd);
 547                         if (lc == NULL ||
 548                             login_setcryptfmt(lc, "md5", NULL) == NULL)
 549                                 warn("setting crypt(3) format");
 550                         login_close(lc);
 551                         pwd->pw_passwd = pw_password(cnf, args, pwd->pw_name);
 552                         edited = 1;
 553                 }
 554
 555         } else {
 556                 login_cap_t *lc;
 557
 558                 /*
 559                  * Add code
 560                  */
 561
 562                 if (a_name == NULL)     /* Required */
 563                         errx(EX_DATAERR, "login name required");
 564                 else if ((pwd = GETPWNAM(a_name->val)) != NULL) /* Exists */
 565                         errx(EX_DATAERR, "login name `%s' already exists", a_name->val);
 566
 567                 /*
 568                  * Now, set up defaults for a new user
 569                  */
 570                 pwd = &fakeuser;
 571                 pwd->pw_name = a_name->val;
 572                 pwd->pw_class = cnf->default_class ? cnf->default_class : "";
 573                 pwd->pw_uid = pw_uidpolicy(cnf, args);
 574                 pwd->pw_gid = pw_gidpolicy(cnf, args, pwd->pw_name, (gid_t) pwd->pw_uid);
 575                 pwd->pw_change = pw_pwdpolicy(cnf, args);
 576                 pwd->pw_expire = pw_exppolicy(cnf, args);
 577                 pwd->pw_dir = pw_homepolicy(cnf, args, pwd->pw_name);
 578                 pwd->pw_shell = pw_shellpolicy(cnf, args, NULL);
 579                 lc = login_getpwclass(pwd);
 580                 if (lc == NULL || login_setcryptfmt(lc, "md5", NULL) == NULL)
 581                         warn("setting crypt(3) format");
 582                 login_close(lc);
 583                 pwd->pw_passwd = pw_password(cnf, args, pwd->pw_name);
 584                 edited = 1;
 585
 586                 if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0)
 587                         warnx("WARNING: new account `%s' has a uid of 0 (superuser access!)", pwd->pw_name);
 588         }
 589
 590         /*
 591          * Shared add/edit code
 592          */
 593         if ((arg = getarg(args, 'c')) != NULL) {
 594                 char    *gecos = pw_checkname((u_char *)arg->val, 1);
 595                 if (strcmp(pwd->pw_gecos, gecos) != 0) {
 596                         pwd->pw_gecos = gecos;
 597                         edited = 1;
 598                 }
 599         }
 600
 601         if ((arg = getarg(args, 'h')) != NULL ||
 602             (arg = getarg(args, 'H')) != NULL) {
 603                 if (strcmp(arg->val, "-") == 0) {
 604                         if (!pwd->pw_passwd || *pwd->pw_passwd != '*') {
 605                                 pwd->pw_passwd = "*";   /* No access */
 606                                 edited = 1;
 607                         }
 608                 } else {
 609                         int             fd = atoi(arg->val);
 610                         int             precrypt = (arg->ch == 'H');
 611                         int             b;
 612                         int             istty = isatty(fd);
 613                         struct termios  t;
 614                         login_cap_t     *lc;
 615
 616                         if (istty) {
 617                                 if (tcgetattr(fd, &t) == -1)
 618                                         istty = 0;
 619                                 else {
 620                                         struct termios  n = t;
 621
 622                                         /* Disable echo */
 623                                         n.c_lflag &= ~(ECHO);
 624                                         tcsetattr(fd, TCSANOW, &n);
 625                                         printf("%s%spassword for user %s:",
 626                                              (mode == M_UPDATE) ? "new " : "",
 627                                              precrypt ? "encrypted " : "",
 628                                              pwd->pw_name);
 629                                         fflush(stdout);
 630                                 }
 631                         }
 632                         b = read(fd, line, sizeof(line) - 1);
 633                         if (istty) {    /* Restore state */
 634                                 tcsetattr(fd, TCSANOW, &t);
 635                                 fputc('\n', stdout);
 636                                 fflush(stdout);
 637                         }
 638                         if (b < 0) {
 639                                 warn("-%c file descriptor", precrypt ? 'H' :
 640                                     'h');
 641                                 return EX_IOERR;
 642                         }
 643                         line[b] = '\0';
 644                         if ((p = strpbrk(line, "\r\n")) != NULL)
 645                                 *p = '\0';
 646                         if (!*line)
 647                                 errx(EX_DATAERR, "empty password read on file descriptor %d", fd);
 648                         if (precrypt) {
 649                                 if (strchr(line, ':') != NULL)
 650                                         return EX_DATAERR;
 651                                 pwd->pw_passwd = line;
 652                         } else {
 653                                 lc = login_getpwclass(pwd);
 654                                 if (lc == NULL ||
 655                                     login_setcryptfmt(lc, "md5", NULL) == NULL)
 656                                         warn("setting crypt(3) format");
 657                                 login_close(lc);
 658                                 pwd->pw_passwd = pw_pwcrypt(line);
 659                         }
 660                         edited = 1;
 661                 }
 662         }
 663
 664         /*
 665          * Special case: -N only displays & exits
 666          */
 667         if (getarg(args, 'N') != NULL)
 668                 return print_user(pwd,
 669                                   getarg(args, 'P') != NULL,
 670                                   getarg(args, '7') != NULL);
 671
 672         if (mode == M_ADD) {
 673                 edited = 1;     /* Always */
 674                 rc = addpwent(pwd);
 675                 if (rc == -1) {
 676                         warnx("user '%s' already exists", pwd->pw_name);
 677                         return EX_IOERR;
 678                 } else if (rc != 0) {
 679                         warn("passwd file update");
 680                         return EX_IOERR;
 681                 }
 682                 if (cnf->nispasswd && *cnf->nispasswd=='/') {
 683                         rc = addnispwent(cnf->nispasswd, pwd);
 684                         if (rc == -1)
 685                                 warnx("User '%s' already exists in NIS passwd", pwd->pw_name);
 686                         else
 687                                 warn("NIS passwd update");
 688                         /* NOTE: we treat NIS-only update errors as non-fatal */
 689                 }
 690         } else if (mode == M_UPDATE || mode == M_LOCK || mode == M_UNLOCK) {
 691                 if (edited) {   /* Only updated this if required */
 692                         rc = chgpwent(a_name->val, pwd);
 693                         if (rc == -1) {
 694                                 warnx("user '%s' does not exist (NIS?)", pwd->pw_name);
 695                                 return EX_IOERR;
 696                         } else if (rc != 0) {
 697                                 warn("passwd file update");
 698                                 return EX_IOERR;
 699                         }
 700                         if ( cnf->nispasswd && *cnf->nispasswd=='/') {
 701                                 rc = chgnispwent(cnf->nispasswd, a_name->val, pwd);
 702                                 if (rc == -1)
 703                                         warn("User '%s' not found in NIS passwd", pwd->pw_name);
 704                                 else
 705                                         warn("NIS passwd update");
 706                                 /* NOTE: NIS-only update errors are not fatal */
 707                         }
 708                 }
 709         }
 710
 711         /*
 712          * Ok, user is created or changed - now edit group file
 713          */
 714
 715         if (mode == M_ADD || getarg(args, 'G') != NULL)
 716                 editgroups(pwd->pw_name, cnf->groups);
 717
 718         /* go get a current version of pwd */
 719         pwd = GETPWNAM(a_name->val);
 720         if (pwd == NULL) {
 721                 /* This will fail when we rename, so special case that */
 722                 if (mode == M_UPDATE && (arg = getarg(args, 'l')) != NULL) {
 723                         a_name->val = arg->val;         /* update new name */
 724                         pwd = GETPWNAM(a_name->val);    /* refetch renamed rec */
 725                 }
 726         }
 727         if (pwd == NULL)        /* can't go on without this */
 728                 errx(EX_NOUSER, "user '%s' disappeared during update", a_name->val);
 729
 730         grp = GETGRGID(pwd->pw_gid);
 731         pw_log(cnf, mode, W_USER, "%s(%ld):%s(%ld):%s:%s:%s",
 732                pwd->pw_name, (long) pwd->pw_uid,
 733             grp ? grp->gr_name : "unknown", (long) (grp ? grp->gr_gid : -1),
 734                pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell);
 735
 736         /*
 737          * If adding, let's touch and chown the user's mail file. This is not
 738          * strictly necessary under BSD with a 0755 maildir but it also
 739          * doesn't hurt anything to create the empty mailfile
 740          */
 741         if (mode == M_ADD) {
 742                 if (!PWALTDIR()) {
 743                         sprintf(line, "%s/%s", _PATH_MAILDIR, pwd->pw_name);
 744                         close(open(line, O_RDWR | O_CREAT, 0600));      /* Preserve contents &
 745                                                                          * mtime */
 746                         chown(line, pwd->pw_uid, pwd->pw_gid);
 747                 }
 748         }
 749
 750         /*
 751          * Let's create and populate the user's home directory. Note
 752          * that this also `works' for editing users if -m is used, but
 753          * existing files will *not* be overwritten.
 754          */
 755         if (!PWALTDIR() && getarg(args, 'm') != NULL && pwd->pw_dir && *pwd->pw_dir == '/' && pwd->pw_dir[1]) {
 756                 copymkdir(pwd->pw_dir, cnf->dotdir, cnf->homemode, pwd->pw_uid, pwd->pw_gid);
 757                 pw_log(cnf, mode, W_USER, "%s(%ld) home %s made",
 758                        pwd->pw_name, (long) pwd->pw_uid, pwd->pw_dir);
 759         }
 760
 761
 762         /*
 763          * Finally, send mail to the new user as well, if we are asked to
 764          */
 765         if (mode == M_ADD && !PWALTDIR() && cnf->newmail && *cnf->newmail && (fp = fopen(cnf->newmail, "r")) != NULL) {
 766                 FILE           *pfp = popen(_PATH_SENDMAIL " -t", "w");
 767
 768                 if (pfp == NULL)
 769                         warn("sendmail");
 770                 else {
 771                         fprintf(pfp, "From: root\n" "To: %s\n" "Subject: Welcome!\n\n", pwd->pw_name);
 772                         while (fgets(line, sizeof(line), fp) != NULL) {
 773                                 /* Do substitutions? */
 774                                 fputs(line, pfp);
 775                         }
 776                         pclose(pfp);
 777                         pw_log(cnf, mode, W_USER, "%s(%ld) new user mail sent",
 778                             pwd->pw_name, (long) pwd->pw_uid);
 779                 }
 780                 fclose(fp);
 781         }
 782
 783         return EXIT_SUCCESS;
 784 }
 785
 786
 787 static          uid_t
 788 pw_uidpolicy(struct userconf * cnf, struct cargs * args)
 789 {
 790         struct passwd  *pwd;
 791         uid_t           uid = (uid_t) - 1;
 792         struct carg    *a_uid = getarg(args, 'u');
 793
 794         /*
 795          * Check the given uid, if any
 796          */
 797         if (a_uid != NULL) {
 798                 uid = (uid_t) atol(a_uid->val);
 799
 800                 if ((pwd = GETPWUID(uid)) != NULL && getarg(args, 'o') == NULL)
 801                         errx(EX_DATAERR, "uid `%ld' has already been allocated", (long) pwd->pw_uid);
 802         } else {
 803                 struct bitmap   bm;
 804
 805                 /*
 806                  * We need to allocate the next available uid under one of
 807                  * two policies a) Grab the first unused uid b) Grab the
 808                  * highest possible unused uid
 809                  */
 810                 if (cnf->min_uid >= cnf->max_uid) {     /* Sanity
 811                                                          * claus^H^H^H^Hheck */
 812                         cnf->min_uid = 1000;
 813                         cnf->max_uid = 32000;
 814                 }
 815                 bm = bm_alloc(cnf->max_uid - cnf->min_uid + 1);
 816
 817                 /*
 818                  * Now, let's fill the bitmap from the password file
 819                  */
 820                 SETPWENT();
 821                 while ((pwd = GETPWENT()) != NULL)
 822                         if (pwd->pw_uid >= (uid_t) cnf->min_uid && pwd->pw_uid <= (uid_t) cnf->max_uid)
 823                                 bm_setbit(&bm, pwd->pw_uid - cnf->min_uid);
 824                 ENDPWENT();
 825
 826                 /*
 827                  * Then apply the policy, with fallback to reuse if necessary
 828                  */
 829                 if (cnf->reuse_uids || (uid = (uid_t) (bm_lastset(&bm) + cnf->min_uid + 1)) > cnf->max_uid)
 830                         uid = (uid_t) (bm_firstunset(&bm) + cnf->min_uid);
 831
 832                 /*
 833                  * Another sanity check
 834                  */
 835                 if (uid < cnf->min_uid || uid > cnf->max_uid)
 836                         errx(EX_SOFTWARE, "unable to allocate a new uid - range fully used");
 837                 bm_dealloc(&bm);
 838         }
 839         return uid;
 840 }
 841
 842
 843 static          uid_t
 844 pw_gidpolicy(struct userconf * cnf, struct cargs * args, char *nam, gid_t prefer)
 845 {
 846         struct group   *grp;
 847         gid_t           gid = (uid_t) - 1;
 848         struct carg    *a_gid = getarg(args, 'g');
 849
 850         /*
 851          * If no arg given, see if default can help out
 852          */
 853         if (a_gid == NULL && cnf->default_group && *cnf->default_group)
 854                 a_gid = addarg(args, 'g', cnf->default_group);
 855
 856         /*
 857          * Check the given gid, if any
 858          */
 859         SETGRENT();
 860         if (a_gid != NULL) {
 861                 if ((grp = GETGRNAM(a_gid->val)) == NULL) {
 862                         gid = (gid_t) atol(a_gid->val);
 863                         if ((gid == 0 && !isdigit((unsigned char)*a_gid->val)) || (grp = GETGRGID(gid)) == NULL)
 864                                 errx(EX_NOUSER, "group `%s' is not defined", a_gid->val);
 865                 }
 866                 gid = grp->gr_gid;
 867         } else if ((grp = GETGRNAM(nam)) != NULL && grp->gr_mem[0] == NULL) {
 868                 gid = grp->gr_gid;  /* Already created? Use it anyway... */
 869         } else {
 870                 struct cargs    grpargs;
 871                 char            tmp[32];
 872
 873                 LIST_INIT(&grpargs);
 874                 addarg(&grpargs, 'n', nam);
 875
 876                 /*
 877                  * We need to auto-create a group with the user's name. We
 878                  * can send all the appropriate output to our sister routine
 879                  * bit first see if we can create a group with gid==uid so we
 880                  * can keep the user and group ids in sync. We purposely do
 881                  * NOT check the gid range if we can force the sync. If the
 882                  * user's name dups an existing group, then the group add
 883                  * function will happily handle that case for us and exit.
 884                  */
 885                 if (GETGRGID(prefer) == NULL) {
 886                         sprintf(tmp, "%lu", (unsigned long) prefer);
 887                         addarg(&grpargs, 'g', tmp);
 888                 }
 889                 if (getarg(args, 'N'))
 890                 {
 891                         addarg(&grpargs, 'N', NULL);
 892                         addarg(&grpargs, 'q', NULL);
 893                         gid = pw_group(cnf, M_NEXT, &grpargs);
 894                 }
 895                 else
 896                 {
 897                         pw_group(cnf, M_ADD, &grpargs);
 898                         if ((grp = GETGRNAM(nam)) != NULL)
 899                                 gid = grp->gr_gid;
 900                 }
 901                 a_gid = LIST_FIRST(&grpargs);
 902                 while (a_gid != NULL) {
 903                         struct carg    *t = LIST_NEXT(a_gid, list);
 904                         LIST_REMOVE(a_gid, list);
 905                         a_gid = t;
 906                 }
 907         }
 908         ENDGRENT();
 909         return gid;
 910 }
 911
 912
 913 static          time_t
 914 pw_pwdpolicy(struct userconf * cnf, struct cargs * args)
 915 {
 916         time_t          result = 0;
 917         time_t          now = time(NULL);
 918         struct carg    *arg = getarg(args, 'p');
 919
 920         if (arg != NULL) {
 921                 if ((result = parse_date(now, arg->val)) == now)
 922                         errx(EX_DATAERR, "invalid date/time `%s'", arg->val);
 923         } else if (cnf->password_days > 0)
 924                 result = now + ((long) cnf->password_days * 86400L);
 925         return result;
 926 }
 927
 928
 929 static          time_t
 930 pw_exppolicy(struct userconf * cnf, struct cargs * args)
 931 {
 932         time_t          result = 0;
 933         time_t          now = time(NULL);
 934         struct carg    *arg = getarg(args, 'e');
 935
 936         if (arg != NULL) {
 937                 if ((result = parse_date(now, arg->val)) == now)
 938                         errx(EX_DATAERR, "invalid date/time `%s'", arg->val);
 939         } else if (cnf->expire_days > 0)
 940                 result = now + ((long) cnf->expire_days * 86400L);
 941         return result;
 942 }
 943
 944
 945 static char    *
 946 pw_homepolicy(struct userconf * cnf, struct cargs * args, char const * user)
 947 {
 948         struct carg    *arg = getarg(args, 'd');
 949
 950         if (arg)
 951                 return arg->val;
 952         else {
 953                 static char     home[128];
 954
 955                 if (cnf->home == NULL || *cnf->home == '\0')
 956                         errx(EX_CONFIG, "no base home directory set");
 957                 sprintf(home, "%s/%s", cnf->home, user);
 958                 return home;
 959         }
 960 }
 961
 962 static char    *
 963 shell_path(char const * path, char *shells[], char *sh)
 964 {
 965         if (sh != NULL && (*sh == '/' || *sh == '\0'))
 966                 return sh;      /* specified full path or forced none */
 967         else {
 968                 char           *p;
 969                 char            paths[_UC_MAXLINE];
 970
 971                 /*
 972                  * We need to search paths
 973                  */
 974                 strlcpy(paths, path, sizeof(paths));
 975                 for (p = strtok(paths, ": \t\r\n"); p != NULL; p = strtok(NULL, ": \t\r\n")) {
 976                         int             i;
 977                         static char     shellpath[256];
 978
 979                         if (sh != NULL) {
 980                                 sprintf(shellpath, "%s/%s", p, sh);
 981                                 if (access(shellpath, X_OK) == 0)
 982                                         return shellpath;
 983                         } else
 984                                 for (i = 0; i < _UC_MAXSHELLS && shells[i] != NULL; i++) {
 985                                         sprintf(shellpath, "%s/%s", p, shells[i]);
 986                                         if (access(shellpath, X_OK) == 0)
 987                                                 return shellpath;
 988                                 }
 989                 }
 990                 if (sh == NULL)
 991                         errx(EX_OSFILE, "can't find shell `%s' in shell paths", sh);
 992                 errx(EX_CONFIG, "no default shell available or defined");
 993                 return NULL;
 994         }
 995 }
 996
 997
 998 static char    *
 999 pw_shellpolicy(struct userconf * cnf, struct cargs * args, char *newshell)
1000 {
1001         char           *sh = newshell;
1002         struct carg    *arg = getarg(args, 's');
1003
1004         if (newshell == NULL && arg != NULL)
1005                 sh = arg->val;
1006         return shell_path(cnf->shelldir, cnf->shells, sh ? sh : cnf->shell_default);
1007 }
1008
1009 #define SALTSIZE        32
1010
1011 static char const chars[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ./";
1012
1013 char           *
1014 pw_pwcrypt(char *password)
1015 {
1016         int             i;
1017         char            salt[SALTSIZE + 1];
1018         char            *cryptpw;
1019
1020         static char     buf[256];
1021
1022         /*
1023          * Calculate a salt value
1024          */
1025         for (i = 0; i < SALTSIZE; i++)
1026                 salt[i] = chars[arc4random_uniform(sizeof(chars) - 1)];
1027         salt[SALTSIZE] = '\0';
1028
1029         cryptpw = crypt(password, salt);
1030         if (cryptpw == NULL)
1031                 errx(EX_CONFIG, "crypt(3) failure");
1032         return strcpy(buf, cryptpw);
1033 }
1034
1035
1036 static char    *
1037 pw_password(struct userconf * cnf, struct cargs * args, char const * user)
1038 {
1039         int             i, l;
1040         char            pwbuf[32];
1041
1042         switch (cnf->default_password) {
1043         case -1:                /* Random password */
1044                 l = (arc4random() % 8 + 8);     /* 8 - 16 chars */
1045                 for (i = 0; i < l; i++)
1046                         pwbuf[i] = chars[arc4random_uniform(sizeof(chars)-1)];
1047                 pwbuf[i] = '\0';
1048
1049                 /*
1050                  * We give this information back to the user
1051                  */
1052                 if (getarg(args, 'h') == NULL && getarg(args, 'H') == NULL &&
1053                     getarg(args, 'N') == NULL) {
1054                         if (isatty(STDOUT_FILENO))
1055                                 printf("Password for '%s' is: ", user);
1056                         printf("%s\n", pwbuf);
1057                         fflush(stdout);
1058                 }
1059                 break;
1060
1061         case -2:                /* No password at all! */
1062                 return "";
1063
1064         case 0:         /* No login - default */
1065         default:
1066                 return "*";
1067
1068         case 1:         /* user's name */
1069                 strlcpy(pwbuf, user, sizeof(pwbuf));
1070                 break;
1071         }
1072         return pw_pwcrypt(pwbuf);
1073 }
1074
1075
1076 static int
1077 print_user(struct passwd * pwd, int pretty, int v7)
1078 {
1079         if (!pretty) {
1080                 char            buf[_UC_MAXLINE];
1081
1082                 fmtpwentry(buf, pwd, v7 ? PWF_PASSWD : PWF_STANDARD);
1083                 fputs(buf, stdout);
1084         } else {
1085                 int             j;
1086                 char           *p;
1087                 struct group   *grp = GETGRGID(pwd->pw_gid);
1088                 char            uname[60] = "User &", office[60] = "[None]",
1089                                 wphone[60] = "[None]", hphone[60] = "[None]";
1090                 char            acexpire[32] = "[None]", pwexpire[32] = "[None]";
1091                 struct tm *    tptr;
1092
1093                 if ((p = strtok(pwd->pw_gecos, ",")) != NULL) {
1094                         strlcpy(uname, p, sizeof(uname));
1095                         if ((p = strtok(NULL, ",")) != NULL) {
1096                                 strlcpy(office, p, sizeof(office));
1097                                 if ((p = strtok(NULL, ",")) != NULL) {
1098                                         strlcpy(wphone, p, sizeof(wphone));
1099                                         if ((p = strtok(NULL, "")) != NULL) {
1100                                                 strlcpy(hphone, p,
1101                                                     sizeof(hphone));
1102                                         }
1103                                 }
1104                         }
1105                 }
1106                 /*
1107                  * Handle '&' in gecos field
1108                  */
1109                 if ((p = strchr(uname, '&')) != NULL) {
1110                         int             l = strlen(pwd->pw_name);
1111                         int             m = strlen(p);
1112
1113                         memmove(p + l, p + 1, m);
1114                         memmove(p, pwd->pw_name, l);
1115                         *p = (char) toupper((unsigned char)*p);
1116                 }
1117                 if (pwd->pw_expire > (time_t)0 && (tptr = localtime(&pwd->pw_expire)) != NULL)
1118                         strftime(acexpire, sizeof acexpire, "%c", tptr);
1119                 if (pwd->pw_change > (time_t)0 && (tptr = localtime(&pwd->pw_change)) != NULL)
1120                         strftime(pwexpire, sizeof pwexpire, "%c", tptr);
1121                 printf("Login Name: %-15s   #%-12ld Group: %-15s   #%ld\n"
1122                        " Full Name: %s\n"
1123                        "      Home: %-26.26s      Class: %s\n"
1124                        "     Shell: %-26.26s     Office: %s\n"
1125                        "Work Phone: %-26.26s Home Phone: %s\n"
1126                        "Acc Expire: %-26.26s Pwd Expire: %s\n",
1127                        pwd->pw_name, (long) pwd->pw_uid,
1128                        grp ? grp->gr_name : "(invalid)", (long) pwd->pw_gid,
1129                        uname, pwd->pw_dir, pwd->pw_class,
1130                        pwd->pw_shell, office, wphone, hphone,
1131                        acexpire, pwexpire);
1132                 SETGRENT();
1133                 j = 0;
1134                 while ((grp=GETGRENT()) != NULL)
1135                 {
1136                         int     i = 0;
1137                         while (grp->gr_mem[i] != NULL)
1138                         {
1139                                 if (strcmp(grp->gr_mem[i], pwd->pw_name)==0)
1140                                 {
1141                                         printf(j++ == 0 ? "    Groups: %s" : ",%s", grp->gr_name);
1142                                         break;
1143                                 }
1144                                 ++i;
1145                         }
1146                 }
1147                 ENDGRENT();
1148                 printf("%s", j ? "\n" : "");
1149         }
1150         return EXIT_SUCCESS;
1151 }
1152
1153 char    *
1154 pw_checkname(u_char *name, int gecos)
1155 {
1156         char showch[8];
1157         u_char const *badchars, *ch, *showtype;
1158         int reject;
1159
1160         ch = name;
1161         reject = 0;
1162         if (gecos) {
1163                 /* See if the name is valid as a gecos (comment) field. */
1164                 badchars = ":!@";
1165                 showtype = "gecos field";
1166         } else {
1167                 /* See if the name is valid as a userid or group. */
1168                 badchars = " ,\t:+&#%$^()!@~*?<>=|\\/\"";
1169                 showtype = "userid/group name";
1170                 /* Userids and groups can not have a leading '-'. */
1171                 if (*ch == '-')
1172                         reject = 1;
1173         }
1174         if (!reject) {
1175                 while (*ch) {
1176                         if (strchr(badchars, *ch) != NULL || *ch < ' ' ||
1177                             *ch == 127) {
1178                                 reject = 1;
1179                                 break;
1180                         }
1181                         /* 8-bit characters are only allowed in GECOS fields */
1182                         if (!gecos && (*ch & 0x80)) {
1183                                 reject = 1;
1184                                 break;
1185                         }
1186                         ch++;
1187                 }
1188         }
1189         /*
1190          * A `$' is allowed as the final character for userids and groups,
1191          * mainly for the benefit of samba.
1192          */
1193         if (reject && !gecos) {
1194                 if (*ch == '$' && *(ch + 1) == '\0') {
1195                         reject = 0;
1196                         ch++;
1197                 }
1198         }
1199         if (reject) {
1200                 snprintf(showch, sizeof(showch), (*ch >= ' ' && *ch < 127)
1201                     ? "`%c'" : "0x%02x", *ch);
1202                 errx(EX_DATAERR, "invalid character %s at position %td in %s",
1203                     showch, (ch - name), showtype);
1204         }
1205         if (!gecos && (ch - name) > LOGNAMESIZE)
1206                 errx(EX_DATAERR, "name too long `%s' (max is %d)", name,
1207                     LOGNAMESIZE);
1208         return (char *)name;
1209 }
1210
1211
1212 static void
1213 rmat(uid_t uid)
1214 {
1215         DIR            *d = opendir("/var/at/jobs");
1216
1217         if (d != NULL) {
1218                 struct dirent  *e;
1219
1220                 while ((e = readdir(d)) != NULL) {
1221                         struct stat     st;
1222
1223                         if (strncmp(e->d_name, ".lock", 5) != 0 &&
1224                             stat(e->d_name, &st) == 0 &&
1225                             !S_ISDIR(st.st_mode) &&
1226                             st.st_uid == uid) {
1227                                 char            tmp[MAXPATHLEN];
1228
1229                                 sprintf(tmp, "/usr/bin/atrm %s", e->d_name);
1230                                 system(tmp);
1231                         }
1232                 }
1233                 closedir(d);
1234         }
1235 }