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  */
  27
  28 #ifndef lint
  29 static const char rcsid[] =
  30   "$FreeBSD$";
  31 #endif /* not lint */
  32
  33 #include <ctype.h>
  34 #include <err.h>
  35 #include <fcntl.h>
  36 #include <sys/param.h>
  37 #include <dirent.h>
  38 #include <paths.h>
  39 #include <termios.h>
  40 #include <sys/types.h>
  41 #include <sys/time.h>
  42 #include <sys/resource.h>
  43 #include <unistd.h>
  44 #include <login_cap.h>
  45 #include "pw.h"
  46 #include "bitmap.h"
  47
  48 #define LOGNAMESIZE (MAXLOGNAME-1)
  49
  50 static          char locked_str[] = "*LOCKED*";
  51
  52 static int      print_user(struct passwd * pwd, int pretty, int v7);
  53 static uid_t    pw_uidpolicy(struct userconf * cnf, struct cargs * args);
  54 static uid_t    pw_gidpolicy(struct userconf * cnf, struct cargs * args, char *nam, gid_t prefer);
  55 static time_t   pw_pwdpolicy(struct userconf * cnf, struct cargs * args);
  56 static time_t   pw_exppolicy(struct userconf * cnf, struct cargs * args);
  57 static char    *pw_homepolicy(struct userconf * cnf, struct cargs * args, char const * user);
  58 static char    *pw_shellpolicy(struct userconf * cnf, struct cargs * args, char *newshell);
  59 static char    *pw_password(struct userconf * cnf, struct cargs * args, char const * user);
  60 static char    *shell_path(char const * path, char *shells[], char *sh);
  61 static void     rmat(uid_t uid);
  62 static void     rmopie(char const * name);
  63
  64 /*-
  65  * -C config      configuration file
  66  * -q             quiet operation
  67  * -n name        login name
  68  * -u uid         user id
  69  * -c comment     user name/comment
  70  * -d directory   home directory
  71  * -e date        account expiry date
  72  * -p date        password expiry date
  73  * -g grp         primary group
  74  * -G grp1,grp2   additional groups
  75  * -m [ -k dir ]  create and set up home
  76  * -s shell       name of login shell
  77  * -o             duplicate uid ok
  78  * -L class       user class
  79  * -l name        new login name
  80  * -h fd          password filehandle
  81  * -H fd          encrypted password filehandle
  82  * -F             force print or add
  83  *   Setting defaults:
  84  * -D             set user defaults
  85  * -b dir         default home root dir
  86  * -e period      default expiry period
  87  * -p period      default password change period
  88  * -g group       default group
  89  * -G             grp1,grp2.. default additional groups
  90  * -L class       default login class
  91  * -k dir         default home skeleton
  92  * -s shell       default shell
  93  * -w method      default password method
  94  */
  95
  96 int
  97 pw_user(struct userconf * cnf, int mode, struct cargs * args)
  98 {
  99         int             rc, edited = 0;
 100         char           *p = NULL;
 101         char                                     *passtmp;
 102         struct carg    *a_name;
 103         struct carg    *a_uid;
 104         struct carg    *arg;
 105         struct passwd  *pwd = NULL;
 106         struct group   *grp;
 107         struct stat     st;
 108         char            line[_PASSWORD_LEN+1];
 109         FILE           *fp;
 110         char *dmode_c;
 111         void *set = NULL;
 112
 113         static struct passwd fakeuser =
 114         {
 115                 NULL,
 116                 "*",
 117                 -1,
 118                 -1,
 119                 0,
 120                 "",
 121                 "User &",
 122                 "/nonexistent",
 123                 "/bin/sh",
 124                 0
 125 #if defined(__FreeBSD__)
 126                 ,0
 127 #endif
 128         };
 129
 130
 131         /*
 132          * With M_NEXT, we only need to return the
 133          * next uid to stdout
 134          */
 135         if (mode == M_NEXT)
 136         {
 137                 uid_t next = pw_uidpolicy(cnf, args);
 138                 if (getarg(args, 'q'))
 139                         return next;
 140                 printf("%ld:", (long)next);
 141                 pw_group(cnf, mode, args);
 142                 return EXIT_SUCCESS;
 143         }
 144
 145         /*
 146          * We can do all of the common legwork here
 147          */
 148
 149         if ((arg = getarg(args, 'b')) != NULL) {
 150                 cnf->home = arg->val;
 151         }
 152
 153         if ((arg = getarg(args, 'M')) != NULL) {
 154                 dmode_c = arg->val;
 155                 if ((set = setmode(dmode_c)) == NULL)
 156                         errx(EX_DATAERR, "invalid directory creation mode '%s'",
 157                             dmode_c);
 158                 cnf->homemode = getmode(set, _DEF_DIRMODE);
 159                 free(set);
 160         }
 161
 162         /*
 163          * If we'll need to use it or we're updating it,
 164          * then create the base home directory if necessary
 165          */
 166         if (arg != NULL || getarg(args, 'm') != NULL) {
 167                 int     l = strlen(cnf->home);
 168
 169                 if (l > 1 && cnf->home[l-1] == '/')     /* Shave off any trailing path delimiter */
 170                         cnf->home[--l] = '\0';
 171
 172                 if (l < 2 || *cnf->home != '/')         /* Check for absolute path name */
 173                         errx(EX_DATAERR, "invalid base directory for home '%s'", cnf->home);
 174
 175                 if (stat(cnf->home, &st) == -1) {
 176                         char    dbuf[MAXPATHLEN];
 177
 178                         /*
 179                          * This is a kludge especially for Joerg :)
 180                          * If the home directory would be created in the root partition, then
 181                          * we really create it under /usr which is likely to have more space.
 182                          * But we create a symlink from cnf->home -> "/usr" -> cnf->home
 183                          */
 184                         if (strchr(cnf->home+1, '/') == NULL) {
 185                                 strcpy(dbuf, "/usr");
 186                                 strncat(dbuf, cnf->home, MAXPATHLEN-5);
 187                                 if (mkdir(dbuf, _DEF_DIRMODE) != -1 || errno == EEXIST) {
 188                                         chown(dbuf, 0, 0);
 189                                         /*
 190                                          * Skip first "/" and create symlink:
 191                                          * /home -> usr/home
 192                                          */
 193                                         symlink(dbuf+1, cnf->home);
 194                                 }
 195                                 /* If this falls, fall back to old method */
 196                         }
 197                         strlcpy(dbuf, cnf->home, sizeof(dbuf));
 198                         p = dbuf;
 199                         if (stat(dbuf, &st) == -1) {
 200                                 while ((p = strchr(++p, '/')) != NULL) {
 201                                         *p = '\0';
 202                                         if (stat(dbuf, &st) == -1) {
 203                                                 if (mkdir(dbuf, _DEF_DIRMODE) == -1)
 204                                                         goto direrr;
 205                                                 chown(dbuf, 0, 0);
 206                                         } else if (!S_ISDIR(st.st_mode))
 207                                                 errx(EX_OSFILE, "'%s' (root home parent) is not a directory", dbuf);
 208                                         *p = '/';
 209                                 }
 210                         }
 211                         if (stat(dbuf, &st) == -1) {
 212                                 if (mkdir(dbuf, _DEF_DIRMODE) == -1) {
 213                                 direrr: err(EX_OSFILE, "mkdir '%s'", dbuf);
 214                                 }
 215                                 chown(dbuf, 0, 0);
 216                         }
 217                 } else if (!S_ISDIR(st.st_mode))
 218                         errx(EX_OSFILE, "root home `%s' is not a directory", cnf->home);
 219         }
 220
 221         if ((arg = getarg(args, 'e')) != NULL)
 222                 cnf->expire_days = atoi(arg->val);
 223
 224         if ((arg = getarg(args, 'y')) != NULL)
 225                 cnf->nispasswd = arg->val;
 226
 227         if ((arg = getarg(args, 'p')) != NULL && arg->val)
 228                 cnf->password_days = atoi(arg->val);
 229
 230         if ((arg = getarg(args, 'g')) != NULL) {
 231                 if (!*(p = arg->val))   /* Handle empty group list specially */
 232                         cnf->default_group = "";
 233                 else {
 234                         if ((grp = GETGRNAM(p)) == NULL) {
 235                                 if (!isdigit((unsigned char)*p) || (grp = GETGRGID((gid_t) atoi(p))) == NULL)
 236                                         errx(EX_NOUSER, "group `%s' does not exist", p);
 237                         }
 238                         cnf->default_group = newstr(grp->gr_name);
 239                 }
 240         }
 241         if ((arg = getarg(args, 'L')) != NULL)
 242                 cnf->default_class = pw_checkname((u_char *)arg->val, 0);
 243
 244         if ((arg = getarg(args, 'G')) != NULL && arg->val) {
 245                 int i = 0;
 246
 247                 for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
 248                         if ((grp = GETGRNAM(p)) == NULL) {
 249                                 if (!isdigit((unsigned char)*p) || (grp = GETGRGID((gid_t) atoi(p))) == NULL)
 250                                         errx(EX_NOUSER, "group `%s' does not exist", p);
 251                         }
 252                         if (extendarray(&cnf->groups, &cnf->numgroups, i + 2) != -1)
 253                                 cnf->groups[i++] = newstr(grp->gr_name);
 254                 }
 255                 while (i < cnf->numgroups)
 256                         cnf->groups[i++] = NULL;
 257         }
 258
 259         if ((arg = getarg(args, 'k')) != NULL) {
 260                 if (stat(cnf->dotdir = arg->val, &st) == -1 || !S_ISDIR(st.st_mode))
 261                         errx(EX_OSFILE, "skeleton `%s' is not a directory or does not exist", cnf->dotdir);
 262         }
 263
 264         if ((arg = getarg(args, 's')) != NULL)
 265                 cnf->shell_default = arg->val;
 266
 267         if ((arg = getarg(args, 'w')) != NULL)
 268                 cnf->default_password = boolean_val(arg->val, cnf->default_password);
 269         if (mode == M_ADD && getarg(args, 'D')) {
 270                 if (getarg(args, 'n') != NULL)
 271                         errx(EX_DATAERR, "can't combine `-D' with `-n name'");
 272                 if ((arg = getarg(args, 'u')) != NULL && (p = strtok(arg->val, ", \t")) != NULL) {
 273                         if ((cnf->min_uid = (uid_t) atoi(p)) == 0)
 274                                 cnf->min_uid = 1000;
 275                         if ((p = strtok(NULL, " ,\t")) == NULL || (cnf->max_uid = (uid_t) atoi(p)) < cnf->min_uid)
 276                                 cnf->max_uid = 32000;
 277                 }
 278                 if ((arg = getarg(args, 'i')) != NULL && (p = strtok(arg->val, ", \t")) != NULL) {
 279                         if ((cnf->min_gid = (gid_t) atoi(p)) == 0)
 280                                 cnf->min_gid = 1000;
 281                         if ((p = strtok(NULL, " ,\t")) == NULL || (cnf->max_gid = (gid_t) atoi(p)) < cnf->min_gid)
 282                                 cnf->max_gid = 32000;
 283                 }
 284
 285                 arg = getarg(args, 'C');
 286                 if (write_userconfig(arg ? arg->val : NULL))
 287                         return EXIT_SUCCESS;
 288                 warn("config update");
 289                 return EX_IOERR;
 290         }
 291
 292         if (mode == M_PRINT && getarg(args, 'a')) {
 293                 int             pretty = getarg(args, 'P') != NULL;
 294                 int             v7 = getarg(args, '7') != NULL;
 295
 296                 SETPWENT();
 297                 while ((pwd = GETPWENT()) != NULL)
 298                         print_user(pwd, pretty, v7);
 299                 ENDPWENT();
 300                 return EXIT_SUCCESS;
 301         }
 302
 303         if ((a_name = getarg(args, 'n')) != NULL)
 304                 pwd = GETPWNAM(pw_checkname((u_char *)a_name->val, 0));
 305         a_uid = getarg(args, 'u');
 306
 307         if (a_uid == NULL) {
 308                 if (a_name == NULL)
 309                         errx(EX_DATAERR, "user name or id required");
 310
 311                 /*
 312                  * Determine whether 'n' switch is name or uid - we don't
 313                  * really don't really care which we have, but we need to
 314                  * know.
 315                  */
 316                 if (mode != M_ADD && pwd == NULL
 317                     && strspn(a_name->val, "0123456789") == strlen(a_name->val)
 318                     && *a_name->val) {
 319                         (a_uid = a_name)->ch = 'u';
 320                         a_name = NULL;
 321                 }
 322         }
 323
 324         /*
 325          * Update, delete & print require that the user exists
 326          */
 327         if (mode == M_UPDATE || mode == M_DELETE ||
 328             mode == M_PRINT  || mode == M_LOCK   || mode == M_UNLOCK) {
 329
 330                 if (a_name == NULL && pwd == NULL)      /* Try harder */
 331                         pwd = GETPWUID(atoi(a_uid->val));
 332
 333                 if (pwd == NULL) {
 334                         if (mode == M_PRINT && getarg(args, 'F')) {
 335                                 fakeuser.pw_name = a_name ? a_name->val : "nouser";
 336                                 fakeuser.pw_uid = a_uid ? (uid_t) atol(a_uid->val) : -1;
 337                                 return print_user(&fakeuser,
 338                                                   getarg(args, 'P') != NULL,
 339                                                   getarg(args, '7') != NULL);
 340                         }
 341                         if (a_name == NULL)
 342                                 errx(EX_NOUSER, "no such uid `%s'", a_uid->val);
 343                         errx(EX_NOUSER, "no such user `%s'", a_name->val);
 344                 }
 345
 346                 if (a_name == NULL)     /* May be needed later */
 347                         a_name = addarg(args, 'n', newstr(pwd->pw_name));
 348
 349                 /*
 350                  * The M_LOCK and M_UNLOCK functions simply add or remove
 351                  * a "*LOCKED*" prefix from in front of the password to
 352                  * prevent it decoding correctly, and therefore prevents
 353                  * access. Of course, this only prevents access via
 354                  * password authentication (not ssh, kerberos or any
 355                  * other method that does not use the UNIX password) but
 356                  * that is a known limitation.
 357                  */
 358
 359                 if (mode == M_LOCK) {
 360                         if (strncmp(pwd->pw_passwd, locked_str, sizeof(locked_str)-1) == 0)
 361                                 errx(EX_DATAERR, "user '%s' is already locked", pwd->pw_name);
 362                         passtmp = malloc(strlen(pwd->pw_passwd) + sizeof(locked_str));
 363                         if (passtmp == NULL)    /* disaster */
 364                                 errx(EX_UNAVAILABLE, "out of memory");
 365                         strcpy(passtmp, locked_str);
 366                         strcat(passtmp, pwd->pw_passwd);
 367                         pwd->pw_passwd = passtmp;
 368                         edited = 1;
 369                 } else if (mode == M_UNLOCK) {
 370                         if (strncmp(pwd->pw_passwd, locked_str, sizeof(locked_str)-1) != 0)
 371                                 errx(EX_DATAERR, "user '%s' is not locked", pwd->pw_name);
 372                         pwd->pw_passwd += sizeof(locked_str)-1;
 373                         edited = 1;
 374                 } else if (mode == M_DELETE) {
 375                         /*
 376                          * Handle deletions now
 377                          */
 378                         char            file[MAXPATHLEN];
 379                         char            home[MAXPATHLEN];
 380                         uid_t           uid = pwd->pw_uid;
 381
 382                         if (strcmp(pwd->pw_name, "root") == 0)
 383                                 errx(EX_DATAERR, "cannot remove user 'root'");
 384
 385                         if (!PWALTDIR()) {
 386                                 /*
 387                                  * Remove opie record from /etc/opiekeys
 388                                  */
 389
 390                                 rmopie(pwd->pw_name);
 391
 392                                 /*
 393                                  * Remove crontabs
 394                                  */
 395                                 sprintf(file, "/var/cron/tabs/%s", pwd->pw_name);
 396                                 if (access(file, F_OK) == 0) {
 397                                         sprintf(file, "crontab -u %s -r", pwd->pw_name);
 398                                         system(file);
 399                                 }
 400                         }
 401                         /*
 402                          * Save these for later, since contents of pwd may be
 403                          * invalidated by deletion
 404                          */
 405                         sprintf(file, "%s/%s", _PATH_MAILDIR, pwd->pw_name);
 406                         strlcpy(home, pwd->pw_dir, sizeof(home));
 407
 408                         rc = delpwent(pwd);
 409                         if (rc == -1)
 410                                 err(EX_IOERR, "user '%s' does not exist", pwd->pw_name);
 411                         else if (rc != 0) {
 412                                 warn("passwd update");
 413                                 return EX_IOERR;
 414                         }
 415
 416                         if (cnf->nispasswd && *cnf->nispasswd=='/') {
 417                                 rc = delnispwent(cnf->nispasswd, a_name->val);
 418                                 if (rc == -1)
 419                                         warnx("WARNING: user '%s' does not exist in NIS passwd", pwd->pw_name);
 420                                 else if (rc != 0)
 421                                         warn("WARNING: NIS passwd update");
 422                                 /* non-fatal */
 423                         }
 424
 425                         editgroups(a_name->val, NULL);
 426
 427                         pw_log(cnf, mode, W_USER, "%s(%ld) account removed", a_name->val, (long) uid);
 428
 429                         if (!PWALTDIR()) {
 430                                 /*
 431                                  * Remove mail file
 432                                  */
 433                                 remove(file);
 434
 435                                 /*
 436                                  * Remove at jobs
 437                                  */
 438                                 if (getpwuid(uid) == NULL)
 439                                         rmat(uid);
 440
 441                                 /*
 442                                  * Remove home directory and contents
 443                                  */
 444                                 if (getarg(args, 'r') != NULL && *home == '/' && getpwuid(uid) == NULL) {
 445                                         if (stat(home, &st) != -1) {
 446                                                 rm_r(home, uid);
 447                                                 pw_log(cnf, mode, W_USER, "%s(%ld) home '%s' %sremoved",
 448                                                        a_name->val, (long) uid, home,
 449                                                        stat(home, &st) == -1 ? "" : "not completely ");
 450                                         }
 451                                 }
 452                         }
 453                         return EXIT_SUCCESS;
 454                 } else if (mode == M_PRINT)
 455                         return print_user(pwd,
 456                                           getarg(args, 'P') != NULL,
 457                                           getarg(args, '7') != NULL);
 458
 459                 /*
 460                  * The rest is edit code
 461                  */
 462                 if ((arg = getarg(args, 'l')) != NULL) {
 463                         if (strcmp(pwd->pw_name, "root") == 0)
 464                                 errx(EX_DATAERR, "can't rename `root' account");
 465                         pwd->pw_name = pw_checkname((u_char *)arg->val, 0);
 466                         edited = 1;
 467                 }
 468
 469                 if ((arg = getarg(args, 'u')) != NULL && isdigit((unsigned char)*arg->val)) {
 470                         pwd->pw_uid = (uid_t) atol(arg->val);
 471                         edited = 1;
 472                         if (pwd->pw_uid != 0 && strcmp(pwd->pw_name, "root") == 0)
 473                                 errx(EX_DATAERR, "can't change uid of `root' account");
 474                         if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0)
 475                                 warnx("WARNING: account `%s' will have a uid of 0 (superuser access!)", pwd->pw_name);
 476                 }
 477
 478                 if ((arg = getarg(args, 'g')) != NULL && pwd->pw_uid != 0) {    /* Already checked this */
 479                         gid_t newgid = (gid_t) GETGRNAM(cnf->default_group)->gr_gid;
 480                         if (newgid != pwd->pw_gid) {
 481                                 edited = 1;
 482                                 pwd->pw_gid = newgid;
 483                         }
 484                 }
 485
 486                 if ((arg = getarg(args, 'p')) != NULL) {
 487                         if (*arg->val == '\0' || strcmp(arg->val, "0") == 0) {
 488                                 if (pwd->pw_change != 0) {
 489                                         pwd->pw_change = 0;
 490                                         edited = 1;
 491                                 }
 492                         }
 493                         else {
 494                                 time_t          now = time(NULL);
 495                                 time_t          expire = parse_date(now, arg->val);
 496
 497                                 if (pwd->pw_change != expire) {
 498                                         pwd->pw_change = expire;
 499                                         edited = 1;
 500                                 }
 501                         }
 502                 }
 503
 504                 if ((arg = getarg(args, 'e')) != NULL) {
 505                         if (*arg->val == '\0' || strcmp(arg->val, "0") == 0) {
 506                                 if (pwd->pw_expire != 0) {
 507                                         pwd->pw_expire = 0;
 508                                         edited = 1;
 509                                 }
 510                         }
 511                         else {
 512                                 time_t          now = time(NULL);
 513                                 time_t          expire = parse_date(now, arg->val);
 514
 515                                 if (pwd->pw_expire != expire) {
 516                                         pwd->pw_expire = expire;
 517                                         edited = 1;
 518                                 }
 519                         }
 520                 }
 521
 522                 if ((arg = getarg(args, 's')) != NULL) {
 523                         char *shell = shell_path(cnf->shelldir, cnf->shells, arg->val);
 524                         if (shell == NULL)
 525                                 shell = "";
 526                         if (strcmp(shell, pwd->pw_shell) != 0) {
 527                                 pwd->pw_shell = shell;
 528                                 edited = 1;
 529                         }
 530                 }
 531
 532                 if (getarg(args, 'L')) {
 533                         if (cnf->default_class == NULL)
 534                                 cnf->default_class = "";
 535                         if (strcmp(pwd->pw_class, cnf->default_class) != 0) {
 536                                 pwd->pw_class = cnf->default_class;
 537                                 edited = 1;
 538                         }
 539                 }
 540
 541                 if ((arg  = getarg(args, 'd')) != NULL) {
 542                         if (strcmp(pwd->pw_dir, arg->val))
 543                                 edited = 1;
 544                         if (stat(pwd->pw_dir = arg->val, &st) == -1) {
 545                                 if (getarg(args, 'm') == NULL && strcmp(pwd->pw_dir, "/nonexistent") != 0)
 546                                   warnx("WARNING: home `%s' does not exist", pwd->pw_dir);
 547                         } else if (!S_ISDIR(st.st_mode))
 548                                 warnx("WARNING: home `%s' is not a directory", pwd->pw_dir);
 549                 }
 550
 551                 if ((arg = getarg(args, 'w')) != NULL &&
 552                     getarg(args, 'h') == NULL && getarg(args, 'H') == NULL) {
 553                         login_cap_t *lc;
 554
 555                         lc = login_getpwclass(pwd);
 556                         if (lc == NULL ||
 557                             login_setcryptfmt(lc, "sha512", NULL) == NULL)
 558                                 warn("setting crypt(3) format");
 559                         login_close(lc);
 560                         pwd->pw_passwd = pw_password(cnf, args, pwd->pw_name);
 561                         edited = 1;
 562                 }
 563
 564         } else {
 565                 login_cap_t *lc;
 566
 567                 /*
 568                  * Add code
 569                  */
 570
 571                 if (a_name == NULL)     /* Required */
 572                         errx(EX_DATAERR, "login name required");
 573                 else if ((pwd = GETPWNAM(a_name->val)) != NULL) /* Exists */
 574                         errx(EX_DATAERR, "login name `%s' already exists", a_name->val);
 575
 576                 /*
 577                  * Now, set up defaults for a new user
 578                  */
 579                 pwd = &fakeuser;
 580                 pwd->pw_name = a_name->val;
 581                 pwd->pw_class = cnf->default_class ? cnf->default_class : "";
 582                 pwd->pw_uid = pw_uidpolicy(cnf, args);
 583                 pwd->pw_gid = pw_gidpolicy(cnf, args, pwd->pw_name, (gid_t) pwd->pw_uid);
 584                 pwd->pw_change = pw_pwdpolicy(cnf, args);
 585                 pwd->pw_expire = pw_exppolicy(cnf, args);
 586                 pwd->pw_dir = pw_homepolicy(cnf, args, pwd->pw_name);
 587                 pwd->pw_shell = pw_shellpolicy(cnf, args, NULL);
 588                 lc = login_getpwclass(pwd);
 589                 if (lc == NULL || login_setcryptfmt(lc, "md5", NULL) == NULL)
 590                         warn("setting crypt(3) format");
 591                 login_close(lc);
 592                 pwd->pw_passwd = pw_password(cnf, args, pwd->pw_name);
 593                 edited = 1;
 594
 595                 if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0)
 596                         warnx("WARNING: new account `%s' has a uid of 0 (superuser access!)", pwd->pw_name);
 597         }
 598
 599         /*
 600          * Shared add/edit code
 601          */
 602         if ((arg = getarg(args, 'c')) != NULL) {
 603                 char    *gecos = pw_checkname((u_char *)arg->val, 1);
 604                 if (strcmp(pwd->pw_gecos, gecos) != 0) {
 605                         pwd->pw_gecos = gecos;
 606                         edited = 1;
 607                 }
 608         }
 609
 610         if ((arg = getarg(args, 'h')) != NULL ||
 611             (arg = getarg(args, 'H')) != NULL) {
 612                 if (strcmp(arg->val, "-") == 0) {
 613                         if (!pwd->pw_passwd || *pwd->pw_passwd != '*') {
 614                                 pwd->pw_passwd = "*";   /* No access */
 615                                 edited = 1;
 616                         }
 617                 } else {
 618                         int             fd = atoi(arg->val);
 619                         int             precrypt = (arg->ch == 'H');
 620                         int             b;
 621                         int             istty = isatty(fd);
 622                         struct termios  t;
 623                         login_cap_t     *lc;
 624
 625                         if (istty) {
 626                                 if (tcgetattr(fd, &t) == -1)
 627                                         istty = 0;
 628                                 else {
 629                                         struct termios  n = t;
 630
 631                                         /* Disable echo */
 632                                         n.c_lflag &= ~(ECHO);
 633                                         tcsetattr(fd, TCSANOW, &n);
 634                                         printf("%s%spassword for user %s:",
 635                                              (mode == M_UPDATE) ? "new " : "",
 636                                              precrypt ? "encrypted " : "",
 637                                              pwd->pw_name);
 638                                         fflush(stdout);
 639                                 }
 640                         }
 641                         b = read(fd, line, sizeof(line) - 1);
 642                         if (istty) {    /* Restore state */
 643                                 tcsetattr(fd, TCSANOW, &t);
 644                                 fputc('\n', stdout);
 645                                 fflush(stdout);
 646                         }
 647                         if (b < 0) {
 648                                 warn("-%c file descriptor", precrypt ? 'H' :
 649                                     'h');
 650                                 return EX_IOERR;
 651                         }
 652                         line[b] = '\0';
 653                         if ((p = strpbrk(line, "\r\n")) != NULL)
 654                                 *p = '\0';
 655                         if (!*line)
 656                                 errx(EX_DATAERR, "empty password read on file descriptor %d", fd);
 657                         if (precrypt) {
 658                                 if (strchr(line, ':') != NULL)
 659                                         return EX_DATAERR;
 660                                 pwd->pw_passwd = line;
 661                         } else {
 662                                 lc = login_getpwclass(pwd);
 663                                 if (lc == NULL ||
 664                                     login_setcryptfmt(lc, "md5", NULL) == NULL)
 665                                         warn("setting crypt(3) format");
 666                                 login_close(lc);
 667                                 pwd->pw_passwd = pw_pwcrypt(line);
 668                         }
 669                         edited = 1;
 670                 }
 671         }
 672
 673         /*
 674          * Special case: -N only displays & exits
 675          */
 676         if (getarg(args, 'N') != NULL)
 677                 return print_user(pwd,
 678                                   getarg(args, 'P') != NULL,
 679                                   getarg(args, '7') != NULL);
 680
 681         if (mode == M_ADD) {
 682                 edited = 1;     /* Always */
 683                 rc = addpwent(pwd);
 684                 if (rc == -1) {
 685                         warnx("user '%s' already exists", pwd->pw_name);
 686                         return EX_IOERR;
 687                 } else if (rc != 0) {
 688                         warn("passwd file update");
 689                         return EX_IOERR;
 690                 }
 691                 if (cnf->nispasswd && *cnf->nispasswd=='/') {
 692                         rc = addnispwent(cnf->nispasswd, pwd);
 693                         if (rc == -1)
 694                                 warnx("User '%s' already exists in NIS passwd", pwd->pw_name);
 695                         else
 696                                 warn("NIS passwd update");
 697                         /* NOTE: we treat NIS-only update errors as non-fatal */
 698                 }
 699         } else if (mode == M_UPDATE || mode == M_LOCK || mode == M_UNLOCK) {
 700                 if (edited) {   /* Only updated this if required */
 701                         rc = chgpwent(a_name->val, pwd);
 702                         if (rc == -1) {
 703                                 warnx("user '%s' does not exist (NIS?)", pwd->pw_name);
 704                                 return EX_IOERR;
 705                         } else if (rc != 0) {
 706                                 warn("passwd file update");
 707                                 return EX_IOERR;
 708                         }
 709                         if ( cnf->nispasswd && *cnf->nispasswd=='/') {
 710                                 rc = chgnispwent(cnf->nispasswd, a_name->val, pwd);
 711                                 if (rc == -1)
 712                                         warn("User '%s' not found in NIS passwd", pwd->pw_name);
 713                                 else
 714                                         warn("NIS passwd update");
 715                                 /* NOTE: NIS-only update errors are not fatal */
 716                         }
 717                 }
 718         }
 719
 720         /*
 721          * Ok, user is created or changed - now edit group file
 722          */
 723
 724         if (mode == M_ADD || getarg(args, 'G') != NULL)
 725                 editgroups(pwd->pw_name, cnf->groups);
 726
 727         /* go get a current version of pwd */
 728         pwd = GETPWNAM(a_name->val);
 729         if (pwd == NULL) {
 730                 /* This will fail when we rename, so special case that */
 731                 if (mode == M_UPDATE && (arg = getarg(args, 'l')) != NULL) {
 732                         a_name->val = arg->val;         /* update new name */
 733                         pwd = GETPWNAM(a_name->val);    /* refetch renamed rec */
 734                 }
 735         }
 736         if (pwd == NULL)        /* can't go on without this */
 737                 errx(EX_NOUSER, "user '%s' disappeared during update", a_name->val);
 738
 739         grp = GETGRGID(pwd->pw_gid);
 740         pw_log(cnf, mode, W_USER, "%s(%ld):%s(%ld):%s:%s:%s",
 741                pwd->pw_name, (long) pwd->pw_uid,
 742             grp ? grp->gr_name : "unknown", (long) (grp ? grp->gr_gid : -1),
 743                pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell);
 744
 745         /*
 746          * If adding, let's touch and chown the user's mail file. This is not
 747          * strictly necessary under BSD with a 0755 maildir but it also
 748          * doesn't hurt anything to create the empty mailfile
 749          */
 750         if (mode == M_ADD) {
 751                 if (!PWALTDIR()) {
 752                         sprintf(line, "%s/%s", _PATH_MAILDIR, pwd->pw_name);
 753                         close(open(line, O_RDWR | O_CREAT, 0600));      /* Preserve contents &
 754                                                                          * mtime */
 755                         chown(line, pwd->pw_uid, pwd->pw_gid);
 756                 }
 757         }
 758
 759         /*
 760          * Let's create and populate the user's home directory. Note
 761          * that this also `works' for editing users if -m is used, but
 762          * existing files will *not* be overwritten.
 763          */
 764         if (!PWALTDIR() && getarg(args, 'm') != NULL && pwd->pw_dir && *pwd->pw_dir == '/' && pwd->pw_dir[1]) {
 765                 copymkdir(pwd->pw_dir, cnf->dotdir, cnf->homemode, pwd->pw_uid, pwd->pw_gid);
 766                 pw_log(cnf, mode, W_USER, "%s(%ld) home %s made",
 767                        pwd->pw_name, (long) pwd->pw_uid, pwd->pw_dir);
 768         }
 769
 770
 771         /*
 772          * Finally, send mail to the new user as well, if we are asked to
 773          */
 774         if (mode == M_ADD && !PWALTDIR() && cnf->newmail && *cnf->newmail && (fp = fopen(cnf->newmail, "r")) != NULL) {
 775                 FILE           *pfp = popen(_PATH_SENDMAIL " -t", "w");
 776
 777                 if (pfp == NULL)
 778                         warn("sendmail");
 779                 else {
 780                         fprintf(pfp, "From: root\n" "To: %s\n" "Subject: Welcome!\n\n", pwd->pw_name);
 781                         while (fgets(line, sizeof(line), fp) != NULL) {
 782                                 /* Do substitutions? */
 783                                 fputs(line, pfp);
 784                         }
 785                         pclose(pfp);
 786                         pw_log(cnf, mode, W_USER, "%s(%ld) new user mail sent",
 787                             pwd->pw_name, (long) pwd->pw_uid);
 788                 }
 789                 fclose(fp);
 790         }
 791
 792         return EXIT_SUCCESS;
 793 }
 794
 795
 796 static          uid_t
 797 pw_uidpolicy(struct userconf * cnf, struct cargs * args)
 798 {
 799         struct passwd  *pwd;
 800         uid_t           uid = (uid_t) - 1;
 801         struct carg    *a_uid = getarg(args, 'u');
 802
 803         /*
 804          * Check the given uid, if any
 805          */
 806         if (a_uid != NULL) {
 807                 uid = (uid_t) atol(a_uid->val);
 808
 809                 if ((pwd = GETPWUID(uid)) != NULL && getarg(args, 'o') == NULL)
 810                         errx(EX_DATAERR, "uid `%ld' has already been allocated", (long) pwd->pw_uid);
 811         } else {
 812                 struct bitmap   bm;
 813
 814                 /*
 815                  * We need to allocate the next available uid under one of
 816                  * two policies a) Grab the first unused uid b) Grab the
 817                  * highest possible unused uid
 818                  */
 819                 if (cnf->min_uid >= cnf->max_uid) {     /* Sanity
 820                                                          * claus^H^H^H^Hheck */
 821                         cnf->min_uid = 1000;
 822                         cnf->max_uid = 32000;
 823                 }
 824                 bm = bm_alloc(cnf->max_uid - cnf->min_uid + 1);
 825
 826                 /*
 827                  * Now, let's fill the bitmap from the password file
 828                  */
 829                 SETPWENT();
 830                 while ((pwd = GETPWENT()) != NULL)
 831                         if (pwd->pw_uid >= (uid_t) cnf->min_uid && pwd->pw_uid <= (uid_t) cnf->max_uid)
 832                                 bm_setbit(&bm, pwd->pw_uid - cnf->min_uid);
 833                 ENDPWENT();
 834
 835                 /*
 836                  * Then apply the policy, with fallback to reuse if necessary
 837                  */
 838                 if (cnf->reuse_uids || (uid = (uid_t) (bm_lastset(&bm) + cnf->min_uid + 1)) > cnf->max_uid)
 839                         uid = (uid_t) (bm_firstunset(&bm) + cnf->min_uid);
 840
 841                 /*
 842                  * Another sanity check
 843                  */
 844                 if (uid < cnf->min_uid || uid > cnf->max_uid)
 845                         errx(EX_SOFTWARE, "unable to allocate a new uid - range fully used");
 846                 bm_dealloc(&bm);
 847         }
 848         return uid;
 849 }
 850
 851
 852 static          uid_t
 853 pw_gidpolicy(struct userconf * cnf, struct cargs * args, char *nam, gid_t prefer)
 854 {
 855         struct group   *grp;
 856         gid_t           gid = (uid_t) - 1;
 857         struct carg    *a_gid = getarg(args, 'g');
 858
 859         /*
 860          * If no arg given, see if default can help out
 861          */
 862         if (a_gid == NULL && cnf->default_group && *cnf->default_group)
 863                 a_gid = addarg(args, 'g', cnf->default_group);
 864
 865         /*
 866          * Check the given gid, if any
 867          */
 868         SETGRENT();
 869         if (a_gid != NULL) {
 870                 if ((grp = GETGRNAM(a_gid->val)) == NULL) {
 871                         gid = (gid_t) atol(a_gid->val);
 872                         if ((gid == 0 && !isdigit((unsigned char)*a_gid->val)) || (grp = GETGRGID(gid)) == NULL)
 873                                 errx(EX_NOUSER, "group `%s' is not defined", a_gid->val);
 874                 }
 875                 gid = grp->gr_gid;
 876         } else if ((grp = GETGRNAM(nam)) != NULL && grp->gr_mem[0] == NULL) {
 877                 gid = grp->gr_gid;  /* Already created? Use it anyway... */
 878         } else {
 879                 struct cargs    grpargs;
 880                 char            tmp[32];
 881
 882                 LIST_INIT(&grpargs);
 883                 addarg(&grpargs, 'n', nam);
 884
 885                 /*
 886                  * We need to auto-create a group with the user's name. We
 887                  * can send all the appropriate output to our sister routine
 888                  * bit first see if we can create a group with gid==uid so we
 889                  * can keep the user and group ids in sync. We purposely do
 890                  * NOT check the gid range if we can force the sync. If the
 891                  * user's name dups an existing group, then the group add
 892                  * function will happily handle that case for us and exit.
 893                  */
 894                 if (GETGRGID(prefer) == NULL) {
 895                         sprintf(tmp, "%lu", (unsigned long) prefer);
 896                         addarg(&grpargs, 'g', tmp);
 897                 }
 898                 if (getarg(args, 'N'))
 899                 {
 900                         addarg(&grpargs, 'N', NULL);
 901                         addarg(&grpargs, 'q', NULL);
 902                         gid = pw_group(cnf, M_NEXT, &grpargs);
 903                 }
 904                 else
 905                 {
 906                         pw_group(cnf, M_ADD, &grpargs);
 907                         if ((grp = GETGRNAM(nam)) != NULL)
 908                                 gid = grp->gr_gid;
 909                 }
 910                 a_gid = LIST_FIRST(&grpargs);
 911                 while (a_gid != NULL) {
 912                         struct carg    *t = LIST_NEXT(a_gid, list);
 913                         LIST_REMOVE(a_gid, list);
 914                         a_gid = t;
 915                 }
 916         }
 917         ENDGRENT();
 918         return gid;
 919 }
 920
 921
 922 static          time_t
 923 pw_pwdpolicy(struct userconf * cnf, struct cargs * args)
 924 {
 925         time_t          result = 0;
 926         time_t          now = time(NULL);
 927         struct carg    *arg = getarg(args, 'p');
 928
 929         if (arg != NULL) {
 930                 if ((result = parse_date(now, arg->val)) == now)
 931                         errx(EX_DATAERR, "invalid date/time `%s'", arg->val);
 932         } else if (cnf->password_days > 0)
 933                 result = now + ((long) cnf->password_days * 86400L);
 934         return result;
 935 }
 936
 937
 938 static          time_t
 939 pw_exppolicy(struct userconf * cnf, struct cargs * args)
 940 {
 941         time_t          result = 0;
 942         time_t          now = time(NULL);
 943         struct carg    *arg = getarg(args, 'e');
 944
 945         if (arg != NULL) {
 946                 if ((result = parse_date(now, arg->val)) == now)
 947                         errx(EX_DATAERR, "invalid date/time `%s'", arg->val);
 948         } else if (cnf->expire_days > 0)
 949                 result = now + ((long) cnf->expire_days * 86400L);
 950         return result;
 951 }
 952
 953
 954 static char    *
 955 pw_homepolicy(struct userconf * cnf, struct cargs * args, char const * user)
 956 {
 957         struct carg    *arg = getarg(args, 'd');
 958
 959         if (arg)
 960                 return arg->val;
 961         else {
 962                 static char     home[128];
 963
 964                 if (cnf->home == NULL || *cnf->home == '\0')
 965                         errx(EX_CONFIG, "no base home directory set");
 966                 sprintf(home, "%s/%s", cnf->home, user);
 967                 return home;
 968         }
 969 }
 970
 971 static char    *
 972 shell_path(char const * path, char *shells[], char *sh)
 973 {
 974         if (sh != NULL && (*sh == '/' || *sh == '\0'))
 975                 return sh;      /* specified full path or forced none */
 976         else {
 977                 char           *p;
 978                 char            paths[_UC_MAXLINE];
 979
 980                 /*
 981                  * We need to search paths
 982                  */
 983                 strlcpy(paths, path, sizeof(paths));
 984                 for (p = strtok(paths, ": \t\r\n"); p != NULL; p = strtok(NULL, ": \t\r\n")) {
 985                         int             i;
 986                         static char     shellpath[256];
 987
 988                         if (sh != NULL) {
 989                                 sprintf(shellpath, "%s/%s", p, sh);
 990                                 if (access(shellpath, X_OK) == 0)
 991                                         return shellpath;
 992                         } else
 993                                 for (i = 0; i < _UC_MAXSHELLS && shells[i] != NULL; i++) {
 994                                         sprintf(shellpath, "%s/%s", p, shells[i]);
 995                                         if (access(shellpath, X_OK) == 0)
 996                                                 return shellpath;
 997                                 }
 998                 }
 999                 if (sh == NULL)
1000                         errx(EX_OSFILE, "can't find shell `%s' in shell paths", sh);
1001                 errx(EX_CONFIG, "no default shell available or defined");
1002                 return NULL;
1003         }
1004 }
1005
1006
1007 static char    *
1008 pw_shellpolicy(struct userconf * cnf, struct cargs * args, char *newshell)
1009 {
1010         char           *sh = newshell;
1011         struct carg    *arg = getarg(args, 's');
1012
1013         if (newshell == NULL && arg != NULL)
1014                 sh = arg->val;
1015         return shell_path(cnf->shelldir, cnf->shells, sh ? sh : cnf->shell_default);
1016 }
1017
1018 #define SALTSIZE        32
1019
1020 static char const chars[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ./";
1021
1022 char           *
1023 pw_pwcrypt(char *password)
1024 {
1025         int             i;
1026         char            salt[SALTSIZE + 1];
1027
1028         static char     buf[256];
1029
1030         /*
1031          * Calculate a salt value
1032          */
1033         for (i = 0; i < SALTSIZE; i++)
1034                 salt[i] = chars[arc4random_uniform(sizeof(chars) - 1)];
1035         salt[SALTSIZE] = '\0';
1036
1037         return strcpy(buf, crypt(password, salt));
1038 }
1039
1040
1041 static char    *
1042 pw_password(struct userconf * cnf, struct cargs * args, char const * user)
1043 {
1044         int             i, l;
1045         char            pwbuf[32];
1046
1047         switch (cnf->default_password) {
1048         case -1:                /* Random password */
1049                 l = (arc4random() % 8 + 8);     /* 8 - 16 chars */
1050                 for (i = 0; i < l; i++)
1051                         pwbuf[i] = chars[arc4random_uniform(sizeof(chars)-1)];
1052                 pwbuf[i] = '\0';
1053
1054                 /*
1055                  * We give this information back to the user
1056                  */
1057                 if (getarg(args, 'h') == NULL && getarg(args, 'H') == NULL &&
1058                     getarg(args, 'N') == NULL) {
1059                         if (isatty(STDOUT_FILENO))
1060                                 printf("Password for '%s' is: ", user);
1061                         printf("%s\n", pwbuf);
1062                         fflush(stdout);
1063                 }
1064                 break;
1065
1066         case -2:                /* No password at all! */
1067                 return "";
1068
1069         case 0:         /* No login - default */
1070         default:
1071                 return "*";
1072
1073         case 1:         /* user's name */
1074                 strlcpy(pwbuf, user, sizeof(pwbuf));
1075                 break;
1076         }
1077         return pw_pwcrypt(pwbuf);
1078 }
1079
1080
1081 static int
1082 print_user(struct passwd * pwd, int pretty, int v7)
1083 {
1084         if (!pretty) {
1085                 char            buf[_UC_MAXLINE];
1086
1087                 fmtpwentry(buf, pwd, v7 ? PWF_PASSWD : PWF_STANDARD);
1088                 fputs(buf, stdout);
1089         } else {
1090                 int             j;
1091                 char           *p;
1092                 struct group   *grp = GETGRGID(pwd->pw_gid);
1093                 char            uname[60] = "User &", office[60] = "[None]",
1094                                 wphone[60] = "[None]", hphone[60] = "[None]";
1095                 char            acexpire[32] = "[None]", pwexpire[32] = "[None]";
1096                 struct tm *    tptr;
1097
1098                 if ((p = strtok(pwd->pw_gecos, ",")) != NULL) {
1099                         strlcpy(uname, p, sizeof(uname));
1100                         if ((p = strtok(NULL, ",")) != NULL) {
1101                                 strlcpy(office, p, sizeof(office));
1102                                 if ((p = strtok(NULL, ",")) != NULL) {
1103                                         strlcpy(wphone, p, sizeof(wphone));
1104                                         if ((p = strtok(NULL, "")) != NULL) {
1105                                                 strlcpy(hphone, p,
1106                                                     sizeof(hphone));
1107                                         }
1108                                 }
1109                         }
1110                 }
1111                 /*
1112                  * Handle '&' in gecos field
1113                  */
1114                 if ((p = strchr(uname, '&')) != NULL) {
1115                         int             l = strlen(pwd->pw_name);
1116                         int             m = strlen(p);
1117
1118                         memmove(p + l, p + 1, m);
1119                         memmove(p, pwd->pw_name, l);
1120                         *p = (char) toupper((unsigned char)*p);
1121                 }
1122                 if (pwd->pw_expire > (time_t)0 && (tptr = localtime(&pwd->pw_expire)) != NULL)
1123                         strftime(acexpire, sizeof acexpire, "%c", tptr);
1124                 if (pwd->pw_change > (time_t)0 && (tptr = localtime(&pwd->pw_change)) != NULL)
1125                         strftime(pwexpire, sizeof pwexpire, "%c", tptr);
1126                 printf("Login Name: %-15s   #%-12ld Group: %-15s   #%ld\n"
1127                        " Full Name: %s\n"
1128                        "      Home: %-26.26s      Class: %s\n"
1129                        "     Shell: %-26.26s     Office: %s\n"
1130                        "Work Phone: %-26.26s Home Phone: %s\n"
1131                        "Acc Expire: %-26.26s Pwd Expire: %s\n",
1132                        pwd->pw_name, (long) pwd->pw_uid,
1133                        grp ? grp->gr_name : "(invalid)", (long) pwd->pw_gid,
1134                        uname, pwd->pw_dir, pwd->pw_class,
1135                        pwd->pw_shell, office, wphone, hphone,
1136                        acexpire, pwexpire);
1137                 SETGRENT();
1138                 j = 0;
1139                 while ((grp=GETGRENT()) != NULL)
1140                 {
1141                         int     i = 0;
1142                         while (grp->gr_mem[i] != NULL)
1143                         {
1144                                 if (strcmp(grp->gr_mem[i], pwd->pw_name)==0)
1145                                 {
1146                                         printf(j++ == 0 ? "    Groups: %s" : ",%s", grp->gr_name);
1147                                         break;
1148                                 }
1149                                 ++i;
1150                         }
1151                 }
1152                 ENDGRENT();
1153                 printf("%s", j ? "\n" : "");
1154         }
1155         return EXIT_SUCCESS;
1156 }
1157
1158 char    *
1159 pw_checkname(u_char *name, int gecos)
1160 {
1161         char showch[8];
1162         u_char const *badchars, *ch, *showtype;
1163         int reject;
1164
1165         ch = name;
1166         reject = 0;
1167         if (gecos) {
1168                 /* See if the name is valid as a gecos (comment) field. */
1169                 badchars = ":!@";
1170                 showtype = "gecos field";
1171         } else {
1172                 /* See if the name is valid as a userid or group. */
1173                 badchars = " ,\t:+&#%$^()!@~*?<>=|\\/\"";
1174                 showtype = "userid/group name";
1175                 /* Userids and groups can not have a leading '-'. */
1176                 if (*ch == '-')
1177                         reject = 1;
1178         }
1179         if (!reject) {
1180                 while (*ch) {
1181                         if (strchr(badchars, *ch) != NULL || *ch < ' ' ||
1182                             *ch == 127) {
1183                                 reject = 1;
1184                                 break;
1185                         }
1186                         /* 8-bit characters are only allowed in GECOS fields */
1187                         if (!gecos && (*ch & 0x80)) {
1188                                 reject = 1;
1189                                 break;
1190                         }
1191                         ch++;
1192                 }
1193         }
1194         /*
1195          * A `$' is allowed as the final character for userids and groups,
1196          * mainly for the benefit of samba.
1197          */
1198         if (reject && !gecos) {
1199                 if (*ch == '$' && *(ch + 1) == '\0') {
1200                         reject = 0;
1201                         ch++;
1202                 }
1203         }
1204         if (reject) {
1205                 snprintf(showch, sizeof(showch), (*ch >= ' ' && *ch < 127)
1206                     ? "`%c'" : "0x%02x", *ch);
1207                 errx(EX_DATAERR, "invalid character %s at position %td in %s",
1208                     showch, (ch - name), showtype);
1209         }
1210         if (!gecos && (ch - name) > LOGNAMESIZE)
1211                 errx(EX_DATAERR, "name too long `%s' (max is %d)", name,
1212                     LOGNAMESIZE);
1213         return (char *)name;
1214 }
1215
1216
1217 static void
1218 rmat(uid_t uid)
1219 {
1220         DIR            *d = opendir("/var/at/jobs");
1221
1222         if (d != NULL) {
1223                 struct dirent  *e;
1224
1225                 while ((e = readdir(d)) != NULL) {
1226                         struct stat     st;
1227
1228                         if (strncmp(e->d_name, ".lock", 5) != 0 &&
1229                             stat(e->d_name, &st) == 0 &&
1230                             !S_ISDIR(st.st_mode) &&
1231                             st.st_uid == uid) {
1232                                 char            tmp[MAXPATHLEN];
1233
1234                                 sprintf(tmp, "/usr/bin/atrm %s", e->d_name);
1235                                 system(tmp);
1236                         }
1237                 }
1238                 closedir(d);
1239         }
1240 }
1241
1242 static void
1243 rmopie(char const * name)
1244 {
1245         static const char etcopie[] = "/etc/opiekeys";
1246         FILE   *fp = fopen(etcopie, "r+");
1247
1248         if (fp != NULL) {
1249                 char    tmp[1024];
1250                 off_t   atofs = 0;
1251                 int     length = strlen(name);
1252
1253                 while (fgets(tmp, sizeof tmp, fp) != NULL) {
1254                         if (strncmp(name, tmp, length) == 0 && tmp[length]==' ') {
1255                                 if (fseek(fp, atofs, SEEK_SET) == 0) {
1256                                         fwrite("#", 1, 1, fp);  /* Comment username out */
1257                                 }
1258                                 break;
1259                         }
1260                         atofs = ftell(fp);
1261                 }
1262                 /*
1263                  * If we got an error of any sort, don't update!
1264                  */
1265                 fclose(fp);
1266         }
1267 }
1268