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 <sys/param.h>
  34 #include <sys/resource.h>
  35 #include <sys/time.h>
  36 #include <sys/types.h>
  37
  38 #include <ctype.h>
  39 #include <dirent.h>
  40 #include <err.h>
  41 #include <errno.h>
  42 #include <fcntl.h>
  43 #include <grp.h>
  44 #include <pwd.h>
  45 #include <libutil.h>
  46 #include <login_cap.h>
  47 #include <paths.h>
  48 #include <string.h>
  49 #include <sysexits.h>
  50 #include <termios.h>
  51 #include <unistd.h>
  52
  53 #include "pw.h"
  54 #include "bitmap.h"
  55 #include "psdate.h"
  56
  57 #define LOGNAMESIZE (MAXLOGNAME-1)
  58
  59 static          char locked_str[] = "*LOCKED*";
  60
  61 static struct passwd fakeuser = {
  62         "nouser",
  63         "*",
  64         -1,
  65         -1,
  66         0,
  67         "",
  68         "User &",
  69         "/nonexistent",
  70         "/bin/sh",
  71         0,
  72         0
  73 };
  74
  75 static int       print_user(struct passwd *pwd, bool pretty, bool v7);
  76 static uid_t     pw_uidpolicy(struct userconf *cnf, intmax_t id);
  77 static uid_t     pw_gidpolicy(struct userconf *cnf, char *grname, char *nam,
  78     gid_t prefer, bool dryrun);
  79 static char     *pw_homepolicy(struct userconf * cnf, char *homedir,
  80     const char *user);
  81 static char     *pw_shellpolicy(struct userconf * cnf);
  82 static char     *pw_password(struct userconf * cnf, char const * user,
  83     bool dryrun);
  84 static char     *shell_path(char const * path, char *shells[], char *sh);
  85 static void     rmat(uid_t uid);
  86 static void     rmopie(char const * name);
  87
  88 static void
  89 mkdir_home_parents(int dfd, const char *dir)
  90 {
  91         struct stat st;
  92         char *dirs, *tmp;
  93
  94         if (*dir != '/')
  95                 errx(EX_DATAERR, "invalid base directory for home '%s'", dir);
  96
  97         dir++;
  98
  99         if (fstatat(dfd, dir, &st, 0) != -1) {
 100                 if (S_ISDIR(st.st_mode))
 101                         return;
 102                 errx(EX_OSFILE, "root home `/%s' is not a directory", dir);
 103         }
 104
 105         dirs = strdup(dir);
 106         if (dirs == NULL)
 107                 errx(EX_UNAVAILABLE, "out of memory");
 108
 109         tmp = strrchr(dirs, '/');
 110         if (tmp == NULL)
 111                 return;
 112         tmp[0] = '\0';
 113
 114         /*
 115          * This is a kludge especially for Joerg :)
 116          * If the home directory would be created in the root partition, then
 117          * we really create it under /usr which is likely to have more space.
 118          * But we create a symlink from cnf->home -> "/usr" -> cnf->home
 119          */
 120         if (strchr(dirs, '/') == NULL) {
 121                 asprintf(&tmp, "usr/%s", dirs);
 122                 if (tmp == NULL)
 123                         errx(EX_UNAVAILABLE, "out of memory");
 124                 if (mkdirat(dfd, tmp, _DEF_DIRMODE) != -1 || errno == EEXIST) {
 125                         fchownat(dfd, tmp, 0, 0, 0);
 126                         symlinkat(tmp, dfd, dirs);
 127                 }
 128                 free(tmp);
 129         }
 130         tmp = dirs;
 131         if (fstatat(dfd, dirs, &st, 0) == -1) {
 132                 while ((tmp = strchr(tmp + 1, '/')) != NULL) {
 133                         *tmp = '\0';
 134                         if (fstatat(dfd, dirs, &st, 0) == -1) {
 135                                 if (mkdirat(dfd, dirs, _DEF_DIRMODE) == -1)
 136                                         err(EX_OSFILE,  "'%s' (root home parent) is not a directory", dirs);
 137                         }
 138                         *tmp = '/';
 139                 }
 140         }
 141         if (fstatat(dfd, dirs, &st, 0) == -1) {
 142                 if (mkdirat(dfd, dirs, _DEF_DIRMODE) == -1)
 143                         err(EX_OSFILE,  "'%s' (root home parent) is not a directory", dirs);
 144                 fchownat(dfd, dirs, 0, 0, 0);
 145         }
 146
 147         free(dirs);
 148 }
 149
 150 static void
 151 create_and_populate_homedir(struct userconf *cnf, struct passwd *pwd,
 152     const char *skeldir, mode_t homemode, bool update)
 153 {
 154         int skelfd = -1;
 155
 156         /* Create home parents directories */
 157         mkdir_home_parents(conf.rootfd, pwd->pw_dir);
 158
 159         if (skeldir != NULL && *skeldir != '\0') {
 160                 if (*skeldir == '/')
 161                         skeldir++;
 162                 skelfd = openat(conf.rootfd, skeldir, O_DIRECTORY|O_CLOEXEC);
 163         }
 164
 165         copymkdir(conf.rootfd, pwd->pw_dir, skelfd, homemode, pwd->pw_uid,
 166             pwd->pw_gid, 0);
 167         pw_log(cnf, update ? M_UPDATE : M_ADD, W_USER, "%s(%ju) home %s made",
 168             pwd->pw_name, (uintmax_t)pwd->pw_uid, pwd->pw_dir);
 169 }
 170
 171 static int
 172 pw_set_passwd(struct passwd *pwd, int fd, bool precrypted, bool update)
 173 {
 174         int              b, istty;
 175         struct termios   t, n;
 176         login_cap_t     *lc;
 177         char            line[_PASSWORD_LEN+1];
 178         char            *p;
 179
 180         if (fd == '-') {
 181                 if (!pwd->pw_passwd || *pwd->pw_passwd != '*') {
 182                         pwd->pw_passwd = "*";   /* No access */
 183                         return (1);
 184                 }
 185                 return (0);
 186         }
 187
 188         if ((istty = isatty(fd))) {
 189                 if (tcgetattr(fd, &t) == -1)
 190                         istty = 0;
 191                 else {
 192                         n = t;
 193                         n.c_lflag &= ~(ECHO);
 194                         tcsetattr(fd, TCSANOW, &n);
 195                         printf("%s%spassword for user %s:",
 196                             update ? "new " : "",
 197                             precrypted ? "encrypted " : "",
 198                             pwd->pw_name);
 199                         fflush(stdout);
 200                 }
 201         }
 202         b = read(fd, line, sizeof(line) - 1);
 203         if (istty) {    /* Restore state */
 204                 tcsetattr(fd, TCSANOW, &t);
 205                 fputc('\n', stdout);
 206                 fflush(stdout);
 207         }
 208
 209         if (b < 0)
 210                 err(EX_IOERR, "-%c file descriptor",
 211                     precrypted ? 'H' : 'h');
 212         line[b] = '\0';
 213         if ((p = strpbrk(line, "\r\n")) != NULL)
 214                 *p = '\0';
 215         if (!*line)
 216                 errx(EX_DATAERR, "empty password read on file descriptor %d",
 217                     fd);
 218         if (precrypted) {
 219                 if (strchr(line, ':') != NULL)
 220                         errx(EX_DATAERR, "bad encrypted password");
 221                 pwd->pw_passwd = strdup(line);
 222         } else {
 223                 lc = login_getpwclass(pwd);
 224                 if (lc == NULL ||
 225                                 login_setcryptfmt(lc, "sha512", NULL) == NULL)
 226                         warn("setting crypt(3) format");
 227                 login_close(lc);
 228                 pwd->pw_passwd = pw_pwcrypt(line);
 229         }
 230         return (1);
 231 }
 232
 233 static void
 234 perform_chgpwent(const char *name, struct passwd *pwd, char *nispasswd)
 235 {
 236         int rc;
 237         struct passwd *nispwd;
 238
 239         /* duplicate for nis so that chgpwent is not modifying before NIS */
 240         if (nispasswd && *nispasswd == '/')
 241                 nispwd = pw_dup(pwd);
 242
 243         rc = chgpwent(name, pwd);
 244         if (rc == -1)
 245                 errx(EX_IOERR, "user '%s' does not exist (NIS?)", pwd->pw_name);
 246         else if (rc != 0)
 247                 err(EX_IOERR, "passwd file update");
 248
 249         if (nispasswd && *nispasswd == '/') {
 250                 rc = chgnispwent(nispasswd, name, nispwd);
 251                 if (rc == -1)
 252                         warn("User '%s' not found in NIS passwd", pwd->pw_name);
 253                 else if (rc != 0)
 254                         warn("NIS passwd update");
 255                 /* NOTE: NIS-only update errors are not fatal */
 256         }
 257 }
 258
 259 /*
 260  * The M_LOCK and M_UNLOCK functions simply add or remove
 261  * a "*LOCKED*" prefix from in front of the password to
 262  * prevent it decoding correctly, and therefore prevents
 263  * access. Of course, this only prevents access via
 264  * password authentication (not ssh, kerberos or any
 265  * other method that does not use the UNIX password) but
 266  * that is a known limitation.
 267  */
 268 static int
 269 pw_userlock(char *arg1, int mode)
 270 {
 271         struct passwd *pwd = NULL;
 272         char *passtmp = NULL;
 273         char *name;
 274         bool locked = false;
 275         uid_t id = (uid_t)-1;
 276
 277         if (geteuid() != 0)
 278                 errx(EX_NOPERM, "you must be root");
 279
 280         if (arg1 == NULL)
 281                 errx(EX_DATAERR, "username or id required");
 282
 283         name = arg1;
 284         if (arg1[strspn(name, "0123456789")] == '\0')
 285                 id = pw_checkid(name, UID_MAX);
 286
 287         pwd = GETPWNAM(pw_checkname(name, 0));
 288         if (pwd == NULL && id != (uid_t)-1) {
 289                 pwd = GETPWUID(id);
 290                 if (pwd != NULL)
 291                         name = pwd->pw_name;
 292         }
 293         if (pwd == NULL) {
 294                 if (id == (uid_t)-1)
 295                         errx(EX_NOUSER, "no such name or uid `%ju'", (uintmax_t) id);
 296                 errx(EX_NOUSER, "no such user `%s'", name);
 297         }
 298
 299         if (name == NULL)
 300                 name = pwd->pw_name;
 301
 302         if (strncmp(pwd->pw_passwd, locked_str, sizeof(locked_str) -1) == 0)
 303                 locked = true;
 304         if (mode == M_LOCK && locked)
 305                 errx(EX_DATAERR, "user '%s' is already locked", pwd->pw_name);
 306         if (mode == M_UNLOCK && !locked)
 307                 errx(EX_DATAERR, "user '%s' is not locked", pwd->pw_name);
 308
 309         if (mode == M_LOCK) {
 310                 asprintf(&passtmp, "%s%s", locked_str, pwd->pw_passwd);
 311                 if (passtmp == NULL)    /* disaster */
 312                         errx(EX_UNAVAILABLE, "out of memory");
 313                 pwd->pw_passwd = passtmp;
 314         } else {
 315                 pwd->pw_passwd += sizeof(locked_str)-1;
 316         }
 317
 318         perform_chgpwent(name, pwd, NULL);
 319         free(passtmp);
 320
 321         return (EXIT_SUCCESS);
 322 }
 323
 324 static uid_t
 325 pw_uidpolicy(struct userconf * cnf, intmax_t id)
 326 {
 327         struct passwd  *pwd;
 328         struct bitmap   bm;
 329         uid_t           uid = (uid_t) - 1;
 330
 331         /*
 332          * Check the given uid, if any
 333          */
 334         if (id >= 0) {
 335                 uid = (uid_t) id;
 336
 337                 if ((pwd = GETPWUID(uid)) != NULL && conf.checkduplicate)
 338                         errx(EX_DATAERR, "uid `%ju' has already been allocated",
 339                             (uintmax_t)pwd->pw_uid);
 340                 return (uid);
 341         }
 342         /*
 343          * We need to allocate the next available uid under one of
 344          * two policies a) Grab the first unused uid b) Grab the
 345          * highest possible unused uid
 346          */
 347         if (cnf->min_uid >= cnf->max_uid) {     /* Sanity
 348                                                  * claus^H^H^H^Hheck */
 349                 cnf->min_uid = 1000;
 350                 cnf->max_uid = 32000;
 351         }
 352         bm = bm_alloc(cnf->max_uid - cnf->min_uid + 1);
 353
 354         /*
 355          * Now, let's fill the bitmap from the password file
 356          */
 357         SETPWENT();
 358         while ((pwd = GETPWENT()) != NULL)
 359                 if (pwd->pw_uid >= (uid_t) cnf->min_uid && pwd->pw_uid <= (uid_t) cnf->max_uid)
 360                         bm_setbit(&bm, pwd->pw_uid - cnf->min_uid);
 361         ENDPWENT();
 362
 363         /*
 364          * Then apply the policy, with fallback to reuse if necessary
 365          */
 366         if (cnf->reuse_uids || (uid = (uid_t) (bm_lastset(&bm) + cnf->min_uid + 1)) > cnf->max_uid)
 367                 uid = (uid_t) (bm_firstunset(&bm) + cnf->min_uid);
 368
 369         /*
 370          * Another sanity check
 371          */
 372         if (uid < cnf->min_uid || uid > cnf->max_uid)
 373                 errx(EX_SOFTWARE, "unable to allocate a new uid - range fully used");
 374         bm_dealloc(&bm);
 375         return (uid);
 376 }
 377
 378 static uid_t
 379 pw_gidpolicy(struct userconf *cnf, char *grname, char *nam, gid_t prefer, bool dryrun)
 380 {
 381         struct group   *grp;
 382         gid_t           gid = (uid_t) - 1;
 383
 384         /*
 385          * Check the given gid, if any
 386          */
 387         SETGRENT();
 388         if (grname) {
 389                 if ((grp = GETGRNAM(grname)) == NULL) {
 390                         gid = pw_checkid(grname, GID_MAX);
 391                         grp = GETGRGID(gid);
 392                 }
 393                 gid = grp->gr_gid;
 394         } else if ((grp = GETGRNAM(nam)) != NULL &&
 395             (grp->gr_mem == NULL || grp->gr_mem[0] == NULL)) {
 396                 gid = grp->gr_gid;  /* Already created? Use it anyway... */
 397         } else {
 398                 intmax_t                grid = -1;
 399
 400                 /*
 401                  * We need to auto-create a group with the user's name. We
 402                  * can send all the appropriate output to our sister routine
 403                  * bit first see if we can create a group with gid==uid so we
 404                  * can keep the user and group ids in sync. We purposely do
 405                  * NOT check the gid range if we can force the sync. If the
 406                  * user's name dups an existing group, then the group add
 407                  * function will happily handle that case for us and exit.
 408                  */
 409                 if (GETGRGID(prefer) == NULL)
 410                         grid = prefer;
 411                 if (dryrun) {
 412                         gid = pw_groupnext(cnf, true);
 413                 } else {
 414                         if (grid == -1)
 415                                 grid =  pw_groupnext(cnf, true);
 416                         groupadd(cnf, nam, grid, NULL, -1, false, false, false);
 417                         if ((grp = GETGRNAM(nam)) != NULL)
 418                                 gid = grp->gr_gid;
 419                 }
 420         }
 421         ENDGRENT();
 422         return (gid);
 423 }
 424
 425 static char *
 426 pw_homepolicy(struct userconf * cnf, char *homedir, const char *user)
 427 {
 428         static char     home[128];
 429
 430         if (homedir)
 431                 return (homedir);
 432
 433         if (cnf->home == NULL || *cnf->home == '\0')
 434                 errx(EX_CONFIG, "no base home directory set");
 435         snprintf(home, sizeof(home), "%s/%s", cnf->home, user);
 436
 437         return (home);
 438 }
 439
 440 static char *
 441 shell_path(char const * path, char *shells[], char *sh)
 442 {
 443         if (sh != NULL && (*sh == '/' || *sh == '\0'))
 444                 return sh;      /* specified full path or forced none */
 445         else {
 446                 char           *p;
 447                 char            paths[_UC_MAXLINE];
 448
 449                 /*
 450                  * We need to search paths
 451                  */
 452                 strlcpy(paths, path, sizeof(paths));
 453                 for (p = strtok(paths, ": \t\r\n"); p != NULL; p = strtok(NULL, ": \t\r\n")) {
 454                         int             i;
 455                         static char     shellpath[256];
 456
 457                         if (sh != NULL) {
 458                                 snprintf(shellpath, sizeof(shellpath), "%s/%s", p, sh);
 459                                 if (access(shellpath, X_OK) == 0)
 460                                         return shellpath;
 461                         } else
 462                                 for (i = 0; i < _UC_MAXSHELLS && shells[i] != NULL; i++) {
 463                                         snprintf(shellpath, sizeof(shellpath), "%s/%s", p, shells[i]);
 464                                         if (access(shellpath, X_OK) == 0)
 465                                                 return shellpath;
 466                                 }
 467                 }
 468                 if (sh == NULL)
 469                         errx(EX_OSFILE, "can't find shell `%s' in shell paths", sh);
 470                 errx(EX_CONFIG, "no default shell available or defined");
 471                 return NULL;
 472         }
 473 }
 474
 475 static char *
 476 pw_shellpolicy(struct userconf * cnf)
 477 {
 478
 479         return shell_path(cnf->shelldir, cnf->shells, cnf->shell_default);
 480 }
 481
 482 #define SALTSIZE        32
 483
 484 static char const chars[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ./";
 485
 486 char *
 487 pw_pwcrypt(char *password)
 488 {
 489         int             i;
 490         char            salt[SALTSIZE + 1];
 491         char            *cryptpw;
 492         static char     buf[256];
 493
 494         /*
 495          * Calculate a salt value
 496          */
 497         for (i = 0; i < SALTSIZE; i++)
 498                 salt[i] = chars[arc4random_uniform(sizeof(chars) - 1)];
 499         salt[SALTSIZE] = '\0';
 500
 501         cryptpw = crypt(password, salt);
 502         if (cryptpw == NULL)
 503                 errx(EX_CONFIG, "crypt(3) failure");
 504         return strcpy(buf, cryptpw);
 505 }
 506
 507 static char *
 508 pw_password(struct userconf * cnf, char const * user, bool dryrun)
 509 {
 510         int             i, l;
 511         char            pwbuf[32];
 512
 513         switch (cnf->default_password) {
 514         case -1:                /* Random password */
 515                 l = (arc4random() % 8 + 8);     /* 8 - 16 chars */
 516                 for (i = 0; i < l; i++)
 517                         pwbuf[i] = chars[arc4random_uniform(sizeof(chars)-1)];
 518                 pwbuf[i] = '\0';
 519
 520                 /*
 521                  * We give this information back to the user
 522                  */
 523                 if (conf.fd == -1 && !dryrun) {
 524                         if (isatty(STDOUT_FILENO))
 525                                 printf("Password for '%s' is: ", user);
 526                         printf("%s\n", pwbuf);
 527                         fflush(stdout);
 528                 }
 529                 break;
 530
 531         case -2:                /* No password at all! */
 532                 return "";
 533
 534         case 0:         /* No login - default */
 535         default:
 536                 return "*";
 537
 538         case 1:         /* user's name */
 539                 strlcpy(pwbuf, user, sizeof(pwbuf));
 540                 break;
 541         }
 542         return pw_pwcrypt(pwbuf);
 543 }
 544
 545 static int
 546 print_user(struct passwd * pwd, bool pretty, bool v7)
 547 {
 548         int             j;
 549         char           *p;
 550         struct group   *grp = GETGRGID(pwd->pw_gid);
 551         char            uname[60] = "User &", office[60] = "[None]",
 552                         wphone[60] = "[None]", hphone[60] = "[None]";
 553         char            acexpire[32] = "[None]", pwexpire[32] = "[None]";
 554         struct tm *    tptr;
 555
 556         if (!pretty) {
 557                 p = v7 ? pw_make_v7(pwd) : pw_make(pwd);
 558                 printf("%s\n", p);
 559                 free(p);
 560                 return (EXIT_SUCCESS);
 561         }
 562
 563         if ((p = strtok(pwd->pw_gecos, ",")) != NULL) {
 564                 strlcpy(uname, p, sizeof(uname));
 565                 if ((p = strtok(NULL, ",")) != NULL) {
 566                         strlcpy(office, p, sizeof(office));
 567                         if ((p = strtok(NULL, ",")) != NULL) {
 568                                 strlcpy(wphone, p, sizeof(wphone));
 569                                 if ((p = strtok(NULL, "")) != NULL) {
 570                                         strlcpy(hphone, p, sizeof(hphone));
 571                                 }
 572                         }
 573                 }
 574         }
 575         /*
 576          * Handle '&' in gecos field
 577          */
 578         if ((p = strchr(uname, '&')) != NULL) {
 579                 int             l = strlen(pwd->pw_name);
 580                 int             m = strlen(p);
 581
 582                 memmove(p + l, p + 1, m);
 583                 memmove(p, pwd->pw_name, l);
 584                 *p = (char) toupper((unsigned char)*p);
 585         }
 586         if (pwd->pw_expire > (time_t)0 && (tptr = localtime(&pwd->pw_expire)) != NULL)
 587                 strftime(acexpire, sizeof acexpire, "%c", tptr);
 588                 if (pwd->pw_change > (time_t)0 && (tptr = localtime(&pwd->pw_change)) != NULL)
 589                 strftime(pwexpire, sizeof pwexpire, "%c", tptr);
 590         printf("Login Name: %-15s   #%-12ju Group: %-15s   #%ju\n"
 591                " Full Name: %s\n"
 592                "      Home: %-26.26s      Class: %s\n"
 593                "     Shell: %-26.26s     Office: %s\n"
 594                "Work Phone: %-26.26s Home Phone: %s\n"
 595                "Acc Expire: %-26.26s Pwd Expire: %s\n",
 596                pwd->pw_name, (uintmax_t)pwd->pw_uid,
 597                grp ? grp->gr_name : "(invalid)", (uintmax_t)pwd->pw_gid,
 598                uname, pwd->pw_dir, pwd->pw_class,
 599                pwd->pw_shell, office, wphone, hphone,
 600                acexpire, pwexpire);
 601         SETGRENT();
 602         j = 0;
 603         while ((grp=GETGRENT()) != NULL) {
 604                 int     i = 0;
 605                 if (grp->gr_mem != NULL) {
 606                         while (grp->gr_mem[i] != NULL) {
 607                                 if (strcmp(grp->gr_mem[i], pwd->pw_name)==0) {
 608                                         printf(j++ == 0 ? "    Groups: %s" : ",%s", grp->gr_name);
 609                                         break;
 610                                 }
 611                                 ++i;
 612                         }
 613                 }
 614         }
 615         ENDGRENT();
 616         printf("%s", j ? "\n" : "");
 617         return (EXIT_SUCCESS);
 618 }
 619
 620 char *
 621 pw_checkname(char *name, int gecos)
 622 {
 623         char showch[8];
 624         const char *badchars, *ch, *showtype;
 625         int reject;
 626
 627         ch = name;
 628         reject = 0;
 629         if (gecos) {
 630                 /* See if the name is valid as a gecos (comment) field. */
 631                 badchars = ":!@";
 632                 showtype = "gecos field";
 633         } else {
 634                 /* See if the name is valid as a userid or group. */
 635                 badchars = " ,\t:+&#%$^()!@~*?<>=|\\/\"";
 636                 showtype = "userid/group name";
 637                 /* Userids and groups can not have a leading '-'. */
 638                 if (*ch == '-')
 639                         reject = 1;
 640         }
 641         if (!reject) {
 642                 while (*ch) {
 643                         if (strchr(badchars, *ch) != NULL ||
 644                             (!gecos && *ch < ' ') ||
 645                             *ch == 127) {
 646                                 reject = 1;
 647                                 break;
 648                         }
 649                         /* 8-bit characters are only allowed in GECOS fields */
 650                         if (!gecos && (*ch & 0x80)) {
 651                                 reject = 1;
 652                                 break;
 653                         }
 654                         ch++;
 655                 }
 656         }
 657         /*
 658          * A `$' is allowed as the final character for userids and groups,
 659          * mainly for the benefit of samba.
 660          */
 661         if (reject && !gecos) {
 662                 if (*ch == '$' && *(ch + 1) == '\0') {
 663                         reject = 0;
 664                         ch++;
 665                 }
 666         }
 667         if (reject) {
 668                 snprintf(showch, sizeof(showch), (*ch >= ' ' && *ch < 127)
 669                     ? "`%c'" : "0x%02x", *ch);
 670                 errx(EX_DATAERR, "invalid character %s at position %td in %s",
 671                     showch, (ch - name), showtype);
 672         }
 673         if (!gecos && (ch - name) > LOGNAMESIZE)
 674                 errx(EX_USAGE, "name too long `%s' (max is %d)", name,
 675                     LOGNAMESIZE);
 676
 677         return (name);
 678 }
 679
 680 static void
 681 rmat(uid_t uid)
 682 {
 683         DIR            *d = opendir("/var/at/jobs");
 684
 685         if (d != NULL) {
 686                 struct dirent  *e;
 687
 688                 while ((e = readdir(d)) != NULL) {
 689                         struct stat     st;
 690
 691                         if (strncmp(e->d_name, ".lock", 5) != 0 &&
 692                             stat(e->d_name, &st) == 0 &&
 693                             !S_ISDIR(st.st_mode) &&
 694                             st.st_uid == uid) {
 695                                 char            tmp[MAXPATHLEN];
 696
 697                                 snprintf(tmp, sizeof(tmp), "/usr/bin/atrm %s",
 698                                     e->d_name);
 699                                 system(tmp);
 700                         }
 701                 }
 702                 closedir(d);
 703         }
 704 }
 705
 706 static void
 707 rmopie(char const * name)
 708 {
 709         char tmp[1014];
 710         FILE *fp;
 711         int fd;
 712         size_t len;
 713         off_t   atofs = 0;
 714
 715         if ((fd = openat(conf.rootfd, "etc/opiekeys", O_RDWR)) == -1)
 716                 return;
 717
 718         fp = fdopen(fd, "r+");
 719         len = strlen(name);
 720
 721         while (fgets(tmp, sizeof(tmp), fp) != NULL) {
 722                 if (strncmp(name, tmp, len) == 0 && tmp[len]==' ') {
 723                         /* Comment username out */
 724                         if (fseek(fp, atofs, SEEK_SET) == 0)
 725                                 fwrite("#", 1, 1, fp);
 726                         break;
 727                 }
 728                 atofs = ftell(fp);
 729         }
 730         /*
 731          * If we got an error of any sort, don't update!
 732          */
 733         fclose(fp);
 734 }
 735
 736 int
 737 pw_user_next(int argc, char **argv, char *name __unused)
 738 {
 739         struct userconf *cnf = NULL;
 740         const char *cfg = NULL;
 741         int ch;
 742         bool quiet = false;
 743         uid_t next;
 744
 745         while ((ch = getopt(argc, argv, "Cq")) != -1) {
 746                 switch (ch) {
 747                 case 'C':
 748                         cfg = optarg;
 749                         break;
 750                 case 'q':
 751                         quiet = true;
 752                         break;
 753                 }
 754         }
 755
 756         if (quiet)
 757                 freopen(_PATH_DEVNULL, "w", stderr);
 758
 759         cnf = get_userconfig(cfg);
 760
 761         next = pw_uidpolicy(cnf, -1);
 762
 763         printf("%ju:", (uintmax_t)next);
 764         pw_groupnext(cnf, quiet);
 765
 766         return (EXIT_SUCCESS);
 767 }
 768
 769 int
 770 pw_user_show(int argc, char **argv, char *arg1)
 771 {
 772         struct passwd *pwd = NULL;
 773         char *name = NULL;
 774         intmax_t id = -1;
 775         int ch;
 776         bool all = false;
 777         bool pretty = false;
 778         bool force = false;
 779         bool v7 = false;
 780         bool quiet = false;
 781
 782         if (arg1 != NULL) {
 783                 if (arg1[strspn(arg1, "0123456789")] == '\0')
 784                         id = pw_checkid(arg1, UID_MAX);
 785                 else
 786                         name = arg1;
 787         }
 788
 789         while ((ch = getopt(argc, argv, "C:qn:u:FPa7")) != -1) {
 790                 switch (ch) {
 791                 case 'C':
 792                         /* ignore compatibility */
 793                         break;
 794                 case 'q':
 795                         quiet = true;
 796                         break;
 797                 case 'n':
 798                         name = optarg;
 799                         break;
 800                 case 'u':
 801                         id = pw_checkid(optarg, UID_MAX);
 802                         break;
 803                 case 'F':
 804                         force = true;
 805                         break;
 806                 case 'P':
 807                         pretty = true;
 808                         break;
 809                 case 'a':
 810                         all = true;
 811                         break;
 812                 case 7:
 813                         v7 = true;
 814                         break;
 815                 }
 816         }
 817
 818         if (quiet)
 819                 freopen(_PATH_DEVNULL, "w", stderr);
 820
 821         if (all) {
 822                 SETPWENT();
 823                 while ((pwd = GETPWENT()) != NULL)
 824                         print_user(pwd, pretty, v7);
 825                 ENDPWENT();
 826                 return (EXIT_SUCCESS);
 827         }
 828
 829         if (id < 0 && name == NULL)
 830                 errx(EX_DATAERR, "username or id required");
 831
 832         pwd = (name != NULL) ? GETPWNAM(pw_checkname(name, 0)) : GETPWUID(id);
 833         if (pwd == NULL) {
 834                 if (force) {
 835                         pwd = &fakeuser;
 836                 } else {
 837                         if (name == NULL)
 838                                 errx(EX_NOUSER, "no such uid `%ju'",
 839                                     (uintmax_t) id);
 840                         errx(EX_NOUSER, "no such user `%s'", name);
 841                 }
 842         }
 843
 844         return (print_user(pwd, pretty, v7));
 845 }
 846
 847 int
 848 pw_user_del(int argc, char **argv, char *arg1)
 849 {
 850         struct userconf *cnf = NULL;
 851         struct passwd *pwd = NULL;
 852         struct group *gr, *grp;
 853         char *name = NULL;
 854         char grname[MAXLOGNAME];
 855         char *nispasswd = NULL;
 856         char file[MAXPATHLEN];
 857         char home[MAXPATHLEN];
 858         const char *cfg = NULL;
 859         struct stat st;
 860         intmax_t id = -1;
 861         int ch, rc;
 862         bool nis = false;
 863         bool deletehome = false;
 864         bool quiet = false;
 865
 866         if (arg1 != NULL) {
 867                 if (arg1[strspn(arg1, "0123456789")] == '\0')
 868                         id = pw_checkid(arg1, UID_MAX);
 869                 else
 870                         name = arg1;
 871         }
 872
 873         while ((ch = getopt(argc, argv, "C:qn:u:rYy:")) != -1) {
 874                 switch (ch) {
 875                 case 'C':
 876                         cfg = optarg;
 877                         break;
 878                 case 'q':
 879                         quiet = true;
 880                         break;
 881                 case 'n':
 882                         name = optarg;
 883                         break;
 884                 case 'u':
 885                         id = pw_checkid(optarg, UID_MAX);
 886                         break;
 887                 case 'r':
 888                         deletehome = true;
 889                         break;
 890                 case 'y':
 891                         nispasswd = optarg;
 892                         break;
 893                 case 'Y':
 894                         nis = true;
 895                         break;
 896                 }
 897         }
 898
 899         if (quiet)
 900                 freopen(_PATH_DEVNULL, "w", stderr);
 901
 902         if (id < 0 && name == NULL)
 903                 errx(EX_DATAERR, "username or id required");
 904
 905         cnf = get_userconfig(cfg);
 906
 907         if (nispasswd == NULL)
 908                 nispasswd = cnf->nispasswd;
 909
 910         pwd = (name != NULL) ? GETPWNAM(pw_checkname(name, 0)) : GETPWUID(id);
 911         if (pwd == NULL) {
 912                 if (name == NULL)
 913                         errx(EX_NOUSER, "no such uid `%ju'", (uintmax_t) id);
 914                 errx(EX_NOUSER, "no such user `%s'", name);
 915         }
 916
 917         if (PWF._altdir == PWF_REGULAR &&
 918             ((pwd->pw_fields & _PWF_SOURCE) != _PWF_FILES)) {
 919                 if ((pwd->pw_fields & _PWF_SOURCE) == _PWF_NIS) {
 920                         if (!nis && nispasswd && *nispasswd != '/')
 921                                 errx(EX_NOUSER, "Cannot remove NIS user `%s'",
 922                                     name);
 923                 } else {
 924                         errx(EX_NOUSER, "Cannot remove non local user `%s'",
 925                             name);
 926                 }
 927         }
 928
 929         id = pwd->pw_uid;
 930         if (name == NULL)
 931                 name = pwd->pw_name;
 932
 933         if (strcmp(pwd->pw_name, "root") == 0)
 934                 errx(EX_DATAERR, "cannot remove user 'root'");
 935
 936         /* Remove opie record from /etc/opiekeys */
 937         if (PWALTDIR() != PWF_ALT)
 938                 rmopie(pwd->pw_name);
 939
 940         if (!PWALTDIR()) {
 941                 /* Remove crontabs */
 942                 snprintf(file, sizeof(file), "/var/cron/tabs/%s", pwd->pw_name);
 943                 if (access(file, F_OK) == 0) {
 944                         snprintf(file, sizeof(file), "crontab -u %s -r",
 945                             pwd->pw_name);
 946                         system(file);
 947                 }
 948         }
 949
 950         /*
 951          * Save these for later, since contents of pwd may be
 952          * invalidated by deletion
 953          */
 954         snprintf(file, sizeof(file), "%s/%s", _PATH_MAILDIR, pwd->pw_name);
 955         strlcpy(home, pwd->pw_dir, sizeof(home));
 956         gr = GETGRGID(pwd->pw_gid);
 957         if (gr != NULL)
 958                 strlcpy(grname, gr->gr_name, LOGNAMESIZE);
 959         else
 960                 grname[0] = '\0';
 961
 962         rc = delpwent(pwd);
 963         if (rc == -1)
 964                 err(EX_IOERR, "user '%s' does not exist", pwd->pw_name);
 965         else if (rc != 0)
 966                 err(EX_IOERR, "passwd update");
 967
 968         if (nis && nispasswd && *nispasswd=='/') {
 969                 rc = delnispwent(nispasswd, name);
 970                 if (rc == -1)
 971                         warnx("WARNING: user '%s' does not exist in NIS passwd",
 972                             pwd->pw_name);
 973                 else if (rc != 0)
 974                         warn("WARNING: NIS passwd update");
 975         }
 976
 977         grp = GETGRNAM(name);
 978         if (grp != NULL &&
 979             (grp->gr_mem == NULL || *grp->gr_mem == NULL) &&
 980             strcmp(name, grname) == 0)
 981                 delgrent(GETGRNAM(name));
 982         SETGRENT();
 983         while ((grp = GETGRENT()) != NULL) {
 984                 int i, j;
 985                 char group[MAXLOGNAME];
 986                 if (grp->gr_mem == NULL)
 987                         continue;
 988
 989                 for (i = 0; grp->gr_mem[i] != NULL; i++) {
 990                         if (strcmp(grp->gr_mem[i], name) != 0)
 991                                 continue;
 992
 993                         for (j = i; grp->gr_mem[j] != NULL; j++)
 994                                 grp->gr_mem[j] = grp->gr_mem[j+1];
 995                         strlcpy(group, grp->gr_name, MAXLOGNAME);
 996                         chggrent(group, grp);
 997                 }
 998         }
 999         ENDGRENT();
1000
1001         pw_log(cnf, M_DELETE, W_USER, "%s(%ju) account removed", name,
1002             (uintmax_t)id);
1003
1004         /* Remove mail file */
1005         if (PWALTDIR() != PWF_ALT)
1006                 unlinkat(conf.rootfd, file + 1, 0);
1007
1008         /* Remove at jobs */
1009         if (!PWALTDIR() && getpwuid(id) == NULL)
1010                 rmat(id);
1011
1012         /* Remove home directory and contents */
1013         if (PWALTDIR() != PWF_ALT && deletehome && *home == '/' &&
1014             GETPWUID(id) == NULL &&
1015             fstatat(conf.rootfd, home + 1, &st, 0) != -1) {
1016                 rm_r(conf.rootfd, home, id);
1017                 pw_log(cnf, M_DELETE, W_USER, "%s(%ju) home '%s' %s"
1018                     "removed", name, (uintmax_t)id, home,
1019                      fstatat(conf.rootfd, home + 1, &st, 0) == -1 ? "" : "not "
1020                      "completely ");
1021         }
1022
1023         return (EXIT_SUCCESS);
1024 }
1025
1026 int
1027 pw_user_lock(int argc, char **argv, char *arg1)
1028 {
1029         int ch;
1030
1031         while ((ch = getopt(argc, argv, "Cq")) != -1) {
1032                 switch (ch) {
1033                 case 'C':
1034                 case 'q':
1035                         /* compatibility */
1036                         break;
1037                 }
1038         }
1039
1040         return (pw_userlock(arg1, M_LOCK));
1041 }
1042
1043 int
1044 pw_user_unlock(int argc, char **argv, char *arg1)
1045 {
1046         int ch;
1047
1048         while ((ch = getopt(argc, argv, "Cq")) != -1) {
1049                 switch (ch) {
1050                 case 'C':
1051                 case 'q':
1052                         /* compatibility */
1053                         break;
1054                 }
1055         }
1056
1057         return (pw_userlock(arg1, M_UNLOCK));
1058 }
1059
1060 static struct group *
1061 group_from_name_or_id(char *name)
1062 {
1063         const char *errstr = NULL;
1064         struct group *grp;
1065         uintmax_t id;
1066
1067         if ((grp = GETGRNAM(name)) == NULL) {
1068                 id = strtounum(name, 0, GID_MAX, &errstr);
1069                 if (errstr)
1070                         errx(EX_NOUSER, "group `%s' does not exist", name);
1071                 grp = GETGRGID(id);
1072                 if (grp == NULL)
1073                         errx(EX_NOUSER, "group `%s' does not exist", name);
1074         }
1075
1076         return (grp);
1077 }
1078
1079 static void
1080 split_groups(StringList **groups, char *groupsstr)
1081 {
1082         struct group *grp;
1083         char *p;
1084         char tok[] = ", \t";
1085
1086         for (p = strtok(groupsstr, tok); p != NULL; p = strtok(NULL, tok)) {
1087                 grp = group_from_name_or_id(p);
1088                 if (*groups == NULL)
1089                         *groups = sl_init();
1090                 sl_add(*groups, newstr(grp->gr_name));
1091         }
1092 }
1093
1094 static void
1095 validate_grname(struct userconf *cnf, char *group)
1096 {
1097         struct group *grp;
1098
1099         if (group == NULL || *group == '\0') {
1100                 cnf->default_group = "";
1101                 return;
1102         }
1103         grp = group_from_name_or_id(group);
1104         cnf->default_group = newstr(grp->gr_name);
1105 }
1106
1107 static mode_t
1108 validate_mode(char *mode)
1109 {
1110         mode_t m;
1111         void *set;
1112
1113         if ((set = setmode(mode)) == NULL)
1114                 errx(EX_DATAERR, "invalid directory creation mode '%s'", mode);
1115
1116         m = getmode(set, _DEF_DIRMODE);
1117         free(set);
1118         return (m);
1119 }
1120
1121 static void
1122 mix_config(struct userconf *cmdcnf, struct userconf *cfg)
1123 {
1124
1125         if (cmdcnf->default_password == 0)
1126                 cmdcnf->default_password = cfg->default_password;
1127         if (cmdcnf->reuse_uids == 0)
1128                 cmdcnf->reuse_uids = cfg->reuse_uids;
1129         if (cmdcnf->reuse_gids == 0)
1130                 cmdcnf->reuse_gids = cfg->reuse_gids;
1131         if (cmdcnf->nispasswd == NULL)
1132                 cmdcnf->nispasswd = cfg->nispasswd;
1133         if (cmdcnf->dotdir == NULL)
1134                 cmdcnf->dotdir = cfg->dotdir;
1135         if (cmdcnf->newmail == NULL)
1136                 cmdcnf->newmail = cfg->newmail;
1137         if (cmdcnf->logfile == NULL)
1138                 cmdcnf->logfile = cfg->logfile;
1139         if (cmdcnf->home == NULL)
1140                 cmdcnf->home = cfg->home;
1141         if (cmdcnf->homemode == 0)
1142                 cmdcnf->homemode = cfg->homemode;
1143         if (cmdcnf->shelldir == NULL)
1144                 cmdcnf->shelldir = cfg->shelldir;
1145         if (cmdcnf->shells == NULL)
1146                 cmdcnf->shells = cfg->shells;
1147         if (cmdcnf->shell_default == NULL)
1148                 cmdcnf->shell_default = cfg->shell_default;
1149         if (cmdcnf->default_group == NULL)
1150                 cmdcnf->default_group = cfg->default_group;
1151         if (cmdcnf->groups == NULL)
1152                 cmdcnf->groups = cfg->groups;
1153         if (cmdcnf->default_class == NULL)
1154                 cmdcnf->default_class = cfg->default_class;
1155         if (cmdcnf->min_uid == 0)
1156                 cmdcnf->min_uid = cfg->min_uid;
1157         if (cmdcnf->max_uid == 0)
1158                 cmdcnf->max_uid = cfg->max_uid;
1159         if (cmdcnf->min_gid == 0)
1160                 cmdcnf->min_gid = cfg->min_gid;
1161         if (cmdcnf->max_gid == 0)
1162                 cmdcnf->max_gid = cfg->max_gid;
1163         if (cmdcnf->expire_days == 0)
1164                 cmdcnf->expire_days = cfg->expire_days;
1165         if (cmdcnf->password_days == 0)
1166                 cmdcnf->password_days = cfg->password_days;
1167 }
1168
1169 int
1170 pw_user_add(int argc, char **argv, char *arg1)
1171 {
1172         struct userconf *cnf, *cmdcnf;
1173         struct passwd *pwd;
1174         struct group *grp;
1175         struct stat st;
1176         char args[] = "C:qn:u:c:d:e:p:g:G:mM:k:s:oL:i:w:h:H:Db:NPy:Y";
1177         char line[_PASSWORD_LEN+1], path[MAXPATHLEN];
1178         char *gecos, *homedir, *skel, *walk, *userid, *groupid, *grname;
1179         char *default_passwd, *name, *p;
1180         const char *cfg;
1181         login_cap_t *lc;
1182         FILE *pfp, *fp;
1183         intmax_t id = -1;
1184         time_t now;
1185         int rc, ch, fd = -1;
1186         size_t i;
1187         bool dryrun, nis, pretty, quiet, createhome, precrypted, genconf;
1188
1189         dryrun = nis = pretty = quiet = createhome = precrypted = false;
1190         genconf = false;
1191         gecos = homedir = skel = userid = groupid = default_passwd = NULL;
1192         grname = name = NULL;
1193
1194         if ((cmdcnf = calloc(1, sizeof(struct userconf))) == NULL)
1195                 err(EXIT_FAILURE, "calloc()");
1196
1197         if (arg1 != NULL) {
1198                 if (arg1[strspn(arg1, "0123456789")] == '\0')
1199                         id = pw_checkid(arg1, UID_MAX);
1200                 else
1201                         name = arg1;
1202         }
1203
1204         while ((ch = getopt(argc, argv, args)) != -1) {
1205                 switch (ch) {
1206                 case 'C':
1207                         cfg = optarg;
1208                         break;
1209                 case 'q':
1210                         quiet = true;
1211                         break;
1212                 case 'n':
1213                         name = optarg;
1214                         break;
1215                 case 'u':
1216                         userid = optarg;
1217                         break;
1218                 case 'c':
1219                         gecos = pw_checkname(optarg, 1);
1220                         break;
1221                 case 'd':
1222                         homedir = optarg;
1223                         break;
1224                 case 'e':
1225                         now = time(NULL);
1226                         cmdcnf->expire_days = parse_date(now, optarg);
1227                         break;
1228                 case 'p':
1229                         now = time(NULL);
1230                         cmdcnf->password_days = parse_date(now, optarg);
1231                         break;
1232                 case 'g':
1233                         validate_grname(cmdcnf, optarg);
1234                         grname = optarg;
1235                         break;
1236                 case 'G':
1237                         split_groups(&cmdcnf->groups, optarg);
1238                         break;
1239                 case 'm':
1240                         createhome = true;
1241                         break;
1242                 case 'M':
1243                         cmdcnf->homemode = validate_mode(optarg);
1244                         break;
1245                 case 'k':
1246                         walk = skel = optarg;
1247                         if (*walk == '/')
1248                                 walk++;
1249                         if (fstatat(conf.rootfd, walk, &st, 0) == -1)
1250                                 errx(EX_OSFILE, "skeleton `%s' does not "
1251                                     "exists", skel);
1252                         if (!S_ISDIR(st.st_mode))
1253                                 errx(EX_OSFILE, "skeleton `%s' is not a "
1254                                     "directory", skel);
1255                         cmdcnf->dotdir = skel;
1256                         break;
1257                 case 's':
1258                         cmdcnf->shell_default = optarg;
1259                         break;
1260                 case 'o':
1261                         conf.checkduplicate = false;
1262                         break;
1263                 case 'L':
1264                         cmdcnf->default_class = pw_checkname(optarg, 0);
1265                         break;
1266                 case 'i':
1267                         groupid = optarg;
1268                         break;
1269                 case 'w':
1270                         default_passwd = optarg;
1271                         break;
1272                 case 'H':
1273                         if (fd != -1)
1274                                 errx(EX_USAGE, "'-h' and '-H' are mutually "
1275                                     "exclusive options");
1276                         fd = pw_checkfd(optarg);
1277                         precrypted = true;
1278                         if (fd == '-')
1279                                 errx(EX_USAGE, "-H expects a file descriptor");
1280                         break;
1281                 case 'h':
1282                         if (fd != -1)
1283                                 errx(EX_USAGE, "'-h' and '-H' are mutually "
1284                                     "exclusive options");
1285                         fd = pw_checkfd(optarg);
1286                         break;
1287                 case 'D':
1288                         genconf = true;
1289                         break;
1290                 case 'b':
1291                         cmdcnf->home = optarg;
1292                         break;
1293                 case 'N':
1294                         dryrun = true;
1295                         break;
1296                 case 'P':
1297                         pretty = true;
1298                         break;
1299                 case 'y':
1300                         cmdcnf->nispasswd = optarg;
1301                         break;
1302                 case 'Y':
1303                         nis = true;
1304                         break;
1305                 }
1306         }
1307
1308         if (geteuid() != 0 && ! dryrun)
1309                 errx(EX_NOPERM, "you must be root");
1310
1311         if (quiet)
1312                 freopen(_PATH_DEVNULL, "w", stderr);
1313
1314         cnf = get_userconfig(cfg);
1315
1316         mix_config(cmdcnf, cnf);
1317         if (default_passwd)
1318                 cmdcnf->default_password = boolean_val(default_passwd,
1319                     cnf->default_password);
1320         if (genconf) {
1321                 if (name != NULL)
1322                         errx(EX_DATAERR, "can't combine `-D' with `-n name'");
1323                 if (userid != NULL) {
1324                         if ((p = strtok(userid, ", \t")) != NULL)
1325                                 cmdcnf->min_uid = pw_checkid(p, UID_MAX);
1326                         if (cmdcnf->min_uid == 0)
1327                                 cmdcnf->min_uid = 1000;
1328                         if ((p = strtok(NULL, " ,\t")) != NULL)
1329                                 cmdcnf->max_uid = pw_checkid(p, UID_MAX);
1330                         if (cmdcnf->max_uid == 0)
1331                                 cmdcnf->max_uid = 32000;
1332                 }
1333                 if (groupid != NULL) {
1334                         if ((p = strtok(groupid, ", \t")) != NULL)
1335                                 cmdcnf->min_gid = pw_checkid(p, GID_MAX);
1336                         if (cmdcnf->min_gid == 0)
1337                                 cmdcnf->min_gid = 1000;
1338                         if ((p = strtok(NULL, " ,\t")) != NULL)
1339                                 cmdcnf->max_gid = pw_checkid(p, GID_MAX);
1340                         if (cmdcnf->max_gid == 0)
1341                                 cmdcnf->max_gid = 32000;
1342                 }
1343                 if (write_userconfig(cmdcnf, cfg))
1344                         return (EXIT_SUCCESS);
1345                 err(EX_IOERR, "config update");
1346         }
1347
1348         if (userid)
1349                 id = pw_checkid(userid, UID_MAX);
1350         if (id < 0 && name == NULL)
1351                 errx(EX_DATAERR, "user name or id required");
1352
1353         if (name == NULL)
1354                 errx(EX_DATAERR, "login name required");
1355
1356         if (GETPWNAM(name) != NULL)
1357                 errx(EX_DATAERR, "login name `%s' already exists", name);
1358
1359         pwd = &fakeuser;
1360         pwd->pw_name = name;
1361         pwd->pw_class = cmdcnf->default_class ? cmdcnf->default_class : "";
1362         pwd->pw_uid = pw_uidpolicy(cmdcnf, id);
1363         pwd->pw_gid = pw_gidpolicy(cnf, grname, pwd->pw_name,
1364             (gid_t) pwd->pw_uid, dryrun);
1365         pwd->pw_change = cmdcnf->password_days;
1366         pwd->pw_expire = cmdcnf->expire_days;
1367         pwd->pw_dir = pw_homepolicy(cmdcnf, homedir, pwd->pw_name);
1368         pwd->pw_shell = pw_shellpolicy(cmdcnf);
1369         lc = login_getpwclass(pwd);
1370         if (lc == NULL || login_setcryptfmt(lc, "sha512", NULL) == NULL)
1371                 warn("setting crypt(3) format");
1372         login_close(lc);
1373         pwd->pw_passwd = pw_password(cmdcnf, pwd->pw_name, dryrun);
1374         if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0)
1375                 warnx("WARNING: new account `%s' has a uid of 0 "
1376                     "(superuser access!)", pwd->pw_name);
1377         if (gecos)
1378                 pwd->pw_gecos = gecos;
1379
1380         if (fd != -1)
1381                 pw_set_passwd(pwd, fd, precrypted, false);
1382
1383         if (dryrun)
1384                 return (print_user(pwd, pretty, false));
1385
1386         if ((rc = addpwent(pwd)) != 0) {
1387                 if (rc == -1)
1388                         errx(EX_IOERR, "user '%s' already exists",
1389                             pwd->pw_name);
1390                 else if (rc != 0)
1391                         err(EX_IOERR, "passwd file update");
1392         }
1393         if (nis && cmdcnf->nispasswd && *cmdcnf->nispasswd == '/') {
1394                 printf("%s\n", cmdcnf->nispasswd);
1395                 rc = addnispwent(cmdcnf->nispasswd, pwd);
1396                 if (rc == -1)
1397                         warnx("User '%s' already exists in NIS passwd",
1398                             pwd->pw_name);
1399                 else if (rc != 0)
1400                         warn("NIS passwd update");
1401                 /* NOTE: we treat NIS-only update errors as non-fatal */
1402         }
1403
1404         if (cmdcnf->groups != NULL) {
1405                 for (i = 0; i < cmdcnf->groups->sl_cur; i++) {
1406                         grp = GETGRNAM(cmdcnf->groups->sl_str[i]);
1407                         grp = gr_add(grp, pwd->pw_name);
1408                         /*
1409                          * grp can only be NULL in 2 cases:
1410                          * - the new member is already a member
1411                          * - a problem with memory occurs
1412                          * in both cases we want to skip now.
1413                          */
1414                         if (grp == NULL)
1415                                 continue;
1416                         chggrent(grp->gr_name, grp);
1417                         free(grp);
1418                 }
1419         }
1420
1421         pwd = GETPWNAM(name);
1422         if (pwd == NULL)
1423                 errx(EX_NOUSER, "user '%s' disappeared during update", name);
1424
1425         grp = GETGRGID(pwd->pw_gid);
1426         pw_log(cnf, M_ADD, W_USER, "%s(%ju):%s(%ju):%s:%s:%s",
1427                pwd->pw_name, (uintmax_t)pwd->pw_uid,
1428             grp ? grp->gr_name : "unknown",
1429                (uintmax_t)(grp ? grp->gr_gid : (uid_t)-1),
1430                pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell);
1431
1432         /*
1433          * let's touch and chown the user's mail file. This is not
1434          * strictly necessary under BSD with a 0755 maildir but it also
1435          * doesn't hurt anything to create the empty mailfile
1436          */
1437         if (PWALTDIR() != PWF_ALT) {
1438                 snprintf(path, sizeof(path), "%s/%s", _PATH_MAILDIR,
1439                     pwd->pw_name);
1440                 /* Preserve contents & mtime */
1441                 close(openat(conf.rootfd, path +1, O_RDWR | O_CREAT, 0600));
1442                 fchownat(conf.rootfd, path + 1, pwd->pw_uid, pwd->pw_gid,
1443                     AT_SYMLINK_NOFOLLOW);
1444         }
1445
1446         /*
1447          * Let's create and populate the user's home directory. Note
1448          * that this also `works' for editing users if -m is used, but
1449          * existing files will *not* be overwritten.
1450          */
1451         if (PWALTDIR() != PWF_ALT && createhome && pwd->pw_dir &&
1452             *pwd->pw_dir == '/' && pwd->pw_dir[1])
1453                 create_and_populate_homedir(cmdcnf, pwd, cmdcnf->dotdir,
1454                     cmdcnf->homemode, false);
1455
1456         if (!PWALTDIR() && cmdcnf->newmail && *cmdcnf->newmail &&
1457             (fp = fopen(cnf->newmail, "r")) != NULL) {
1458                 if ((pfp = popen(_PATH_SENDMAIL " -t", "w")) == NULL)
1459                         warn("sendmail");
1460                 else {
1461                         fprintf(pfp, "From: root\n" "To: %s\n"
1462                             "Subject: Welcome!\n\n", pwd->pw_name);
1463                         while (fgets(line, sizeof(line), fp) != NULL) {
1464                                 /* Do substitutions? */
1465                                 fputs(line, pfp);
1466                         }
1467                         pclose(pfp);
1468                         pw_log(cnf, M_ADD, W_USER, "%s(%ju) new user mail sent",
1469                             pwd->pw_name, (uintmax_t)pwd->pw_uid);
1470                 }
1471                 fclose(fp);
1472         }
1473
1474         if (nis && nis_update() == 0)
1475                 pw_log(cnf, M_ADD, W_USER, "NIS maps updated");
1476
1477         return (EXIT_SUCCESS);
1478 }
1479
1480 int
1481 pw_user_mod(int argc, char **argv, char *arg1)
1482 {
1483         struct userconf *cnf;
1484         struct passwd *pwd;
1485         struct group *grp;
1486         StringList *groups = NULL;
1487         char args[] = "C:qn:u:c:d:e:p:g:G:mM:l:k:s:w:L:h:H:NPYy:";
1488         const char *cfg;
1489         char *gecos, *homedir, *grname, *name, *newname, *walk, *skel, *shell;
1490         char *passwd, *class, *nispasswd;
1491         login_cap_t *lc;
1492         struct stat st;
1493         intmax_t id = -1;
1494         int ch, fd = -1;
1495         size_t i, j;
1496         bool quiet, createhome, pretty, dryrun, nis, edited, docreatehome;
1497         bool precrypted;
1498         mode_t homemode = 0;
1499         time_t expire_days, password_days, now;
1500
1501         expire_days = password_days = -1;
1502         gecos = homedir = grname = name = newname = skel = shell =NULL;
1503         passwd = NULL;
1504         class = nispasswd = NULL;
1505         quiet = createhome = pretty = dryrun = nis = precrypted = false;
1506         edited = docreatehome = false;
1507
1508         if (arg1 != NULL) {
1509                 if (arg1[strspn(arg1, "0123456789")] == '\0')
1510                         id = pw_checkid(arg1, UID_MAX);
1511                 else
1512                         name = arg1;
1513         }
1514
1515         while ((ch = getopt(argc, argv, args)) != -1) {
1516                 switch (ch) {
1517                 case 'C':
1518                         cfg = optarg;
1519                         break;
1520                 case 'q':
1521                         quiet = true;
1522                         break;
1523                 case 'n':
1524                         name = optarg;
1525                         break;
1526                 case 'u':
1527                         id = pw_checkid(optarg, UID_MAX);
1528                         break;
1529                 case 'c':
1530                         gecos = pw_checkname(optarg, 1);
1531                         break;
1532                 case 'd':
1533                         homedir = optarg;
1534                         break;
1535                 case 'e':
1536                         now = time(NULL);
1537                         expire_days = parse_date(now, optarg);
1538                         break;
1539                 case 'p':
1540                         now = time(NULL);
1541                         password_days = parse_date(now, optarg);
1542                         break;
1543                 case 'g':
1544                         group_from_name_or_id(optarg);
1545                         grname = optarg;
1546                         break;
1547                 case 'G':
1548                         split_groups(&groups, optarg);
1549                         break;
1550                 case 'm':
1551                         createhome = true;
1552                         break;
1553                 case 'M':
1554                         homemode = validate_mode(optarg);
1555                         break;
1556                 case 'l':
1557                         newname = optarg;
1558                         break;
1559                 case 'k':
1560                         walk = skel = optarg;
1561                         if (*walk == '/')
1562                                 walk++;
1563                         if (fstatat(conf.rootfd, walk, &st, 0) == -1)
1564                                 errx(EX_OSFILE, "skeleton `%s' does not "
1565                                     "exists", skel);
1566                         if (!S_ISDIR(st.st_mode))
1567                                 errx(EX_OSFILE, "skeleton `%s' is not a "
1568                                     "directory", skel);
1569                         break;
1570                 case 's':
1571                         shell = optarg;
1572                         break;
1573                 case 'w':
1574                         passwd = optarg;
1575                         break;
1576                 case 'L':
1577                         class = pw_checkname(optarg, 0);
1578                         break;
1579                 case 'H':
1580                         if (fd != -1)
1581                                 errx(EX_USAGE, "'-h' and '-H' are mutually "
1582                                     "exclusive options");
1583                         fd = pw_checkfd(optarg);
1584                         precrypted = true;
1585                         if (fd == '-')
1586                                 errx(EX_USAGE, "-H expects a file descriptor");
1587                         break;
1588                 case 'h':
1589                         if (fd != -1)
1590                                 errx(EX_USAGE, "'-h' and '-H' are mutually "
1591                                     "exclusive options");
1592                         fd = pw_checkfd(optarg);
1593                         break;
1594                 case 'N':
1595                         dryrun = true;
1596                         break;
1597                 case 'P':
1598                         pretty = true;
1599                         break;
1600                 case 'y':
1601                         nispasswd = optarg;
1602                         break;
1603                 case 'Y':
1604                         nis = true;
1605                         break;
1606                 }
1607         }
1608
1609         if (geteuid() != 0 && ! dryrun)
1610                 errx(EX_NOPERM, "you must be root");
1611
1612         if (quiet)
1613                 freopen(_PATH_DEVNULL, "w", stderr);
1614
1615         cnf = get_userconfig(cfg);
1616
1617         if (id < 0 && name == NULL)
1618                 errx(EX_DATAERR, "username or id required");
1619
1620         pwd = (name != NULL) ? GETPWNAM(pw_checkname(name, 0)) : GETPWUID(id);
1621         if (pwd == NULL) {
1622                 if (name == NULL)
1623                         errx(EX_NOUSER, "no such uid `%ju'",
1624                             (uintmax_t) id);
1625                 errx(EX_NOUSER, "no such user `%s'", name);
1626         }
1627
1628         if (name == NULL)
1629                 name = pwd->pw_name;
1630
1631         if (nis && nispasswd == NULL)
1632                 nispasswd = cnf->nispasswd;
1633
1634         if (PWF._altdir == PWF_REGULAR &&
1635             ((pwd->pw_fields & _PWF_SOURCE) != _PWF_FILES)) {
1636                 if ((pwd->pw_fields & _PWF_SOURCE) == _PWF_NIS) {
1637                         if (!nis && nispasswd && *nispasswd != '/')
1638                                 errx(EX_NOUSER, "Cannot modify NIS user `%s'",
1639                                     name);
1640                 } else {
1641                         errx(EX_NOUSER, "Cannot modify non local user `%s'",
1642                             name);
1643                 }
1644         }
1645
1646         if (newname) {
1647                 if (strcmp(pwd->pw_name, "root") == 0)
1648                         errx(EX_DATAERR, "can't rename `root' account");
1649                 if (strcmp(pwd->pw_name, newname) != 0) {
1650                         pwd->pw_name = pw_checkname(newname, 0);
1651                         edited = true;
1652                 }
1653         }
1654
1655         if (id > 0 && pwd->pw_uid != id) {
1656                 pwd->pw_uid = id;
1657                 edited = true;
1658                 if (pwd->pw_uid != 0 && strcmp(pwd->pw_name, "root") == 0)
1659                         errx(EX_DATAERR, "can't change uid of `root' account");
1660                 if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0)
1661                         warnx("WARNING: account `%s' will have a uid of 0 "
1662                             "(superuser access!)", pwd->pw_name);
1663         }
1664
1665         if (grname && pwd->pw_uid != 0) {
1666                 grp = GETGRNAM(grname);
1667                 if (grp == NULL)
1668                         grp = GETGRGID(pw_checkid(grname, GID_MAX));
1669                 if (grp->gr_gid != pwd->pw_gid) {
1670                         pwd->pw_gid = grp->gr_gid;
1671                         edited = true;
1672                 }
1673         }
1674
1675         if (password_days >= 0 && pwd->pw_change != password_days) {
1676                 pwd->pw_change = password_days;
1677                 edited = true;
1678         }
1679
1680         if (expire_days >= 0 && pwd->pw_expire != expire_days) {
1681                 pwd->pw_expire = expire_days;
1682                 edited = true;
1683         }
1684
1685         if (shell) {
1686                 shell = shell_path(cnf->shelldir, cnf->shells, shell);
1687                 if (shell == NULL)
1688                         shell = "";
1689                 if (strcmp(shell, pwd->pw_shell) != 0) {
1690                         pwd->pw_shell = shell;
1691                         edited = true;
1692                 }
1693         }
1694
1695         if (class && strcmp(pwd->pw_class, class) != 0) {
1696                 pwd->pw_class = class;
1697                 edited = true;
1698         }
1699
1700         if (homedir && strcmp(pwd->pw_dir, homedir) != 0) {
1701                 pwd->pw_dir = homedir;
1702                 edited = true;
1703                 if (fstatat(conf.rootfd, pwd->pw_dir, &st, 0) == -1) {
1704                         if (!createhome)
1705                                 warnx("WARNING: home `%s' does not exist",
1706                                     pwd->pw_dir);
1707                         else
1708                                 docreatehome = true;
1709                 } else if (!S_ISDIR(st.st_mode)) {
1710                         warnx("WARNING: home `%s' is not a directory",
1711                             pwd->pw_dir);
1712                 }
1713         }
1714
1715         if (passwd && conf.fd == -1) {
1716                 lc = login_getpwclass(pwd);
1717                 if (lc == NULL || login_setcryptfmt(lc, "sha512", NULL) == NULL)
1718                         warn("setting crypt(3) format");
1719                 login_close(lc);
1720                 cnf->default_password = boolean_val(passwd,
1721                     cnf->default_password);
1722                 pwd->pw_passwd = pw_password(cnf, pwd->pw_name, dryrun);
1723                 edited = true;
1724         }
1725
1726         if (gecos && strcmp(pwd->pw_gecos, gecos) != 0) {
1727                 pwd->pw_gecos = gecos;
1728                 edited = true;
1729         }
1730
1731         if (fd != -1)
1732                 edited = pw_set_passwd(pwd, fd, precrypted, true);
1733
1734         if (dryrun)
1735                 return (print_user(pwd, pretty, false));
1736
1737         if (edited) /* Only updated this if required */
1738                 perform_chgpwent(name, pwd, nis ? nispasswd : NULL);
1739         /* Now perform the needed changes concern groups */
1740         if (groups != NULL) {
1741                 /* Delete User from groups using old name */
1742                 SETGRENT();
1743                 while ((grp = GETGRENT()) != NULL) {
1744                         if (grp->gr_mem == NULL)
1745                                 continue;
1746                         for (i = 0; grp->gr_mem[i] != NULL; i++) {
1747                                 if (strcmp(grp->gr_mem[i] , name) != 0)
1748                                         continue;
1749                                 for (j = i; grp->gr_mem[j] != NULL ; j++)
1750                                         grp->gr_mem[j] = grp->gr_mem[j+1];
1751                                 chggrent(grp->gr_name, grp);
1752                                 break;
1753                         }
1754                 }
1755                 ENDGRENT();
1756                 /* Add the user to the needed groups */
1757                 for (i = 0; i < groups->sl_cur; i++) {
1758                         grp = GETGRNAM(groups->sl_str[i]);
1759                         grp = gr_add(grp, pwd->pw_name);
1760                         if (grp == NULL)
1761                                 continue;
1762                         chggrent(grp->gr_name, grp);
1763                         free(grp);
1764                 }
1765         }
1766         /* In case of rename we need to walk over the different groups */
1767         if (newname) {
1768                 SETGRENT();
1769                 while ((grp = GETGRENT()) != NULL) {
1770                         if (grp->gr_mem == NULL)
1771                                 continue;
1772                         for (i = 0; grp->gr_mem[i] != NULL; i++) {
1773                                 if (strcmp(grp->gr_mem[i], name) != 0)
1774                                         continue;
1775                                 grp->gr_mem[i] = newname;
1776                                 chggrent(grp->gr_name, grp);
1777                                 break;
1778                         }
1779                 }
1780         }
1781
1782         /* go get a current version of pwd */
1783         if (newname)
1784                 name = newname;
1785         pwd = GETPWNAM(name);
1786         if (pwd == NULL)
1787                 errx(EX_NOUSER, "user '%s' disappeared during update", name);
1788         grp = GETGRGID(pwd->pw_gid);
1789         pw_log(cnf, M_UPDATE, W_USER, "%s(%ju):%s(%ju):%s:%s:%s",
1790             pwd->pw_name, (uintmax_t)pwd->pw_uid,
1791             grp ? grp->gr_name : "unknown",
1792             (uintmax_t)(grp ? grp->gr_gid : (uid_t)-1),
1793             pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell);
1794
1795         /*
1796          * Let's create and populate the user's home directory. Note
1797          * that this also `works' for editing users if -m is used, but
1798          * existing files will *not* be overwritten.
1799          */
1800         if (PWALTDIR() != PWF_ALT && docreatehome && pwd->pw_dir &&
1801             *pwd->pw_dir == '/' && pwd->pw_dir[1]) {
1802                 if (!skel)
1803                         skel = cnf->dotdir;
1804                 if (homemode == 0)
1805                         homemode = cnf->homemode;
1806                 create_and_populate_homedir(cnf, pwd, skel, homemode, true);
1807         }
1808
1809         if (nis && nis_update() == 0)
1810                 pw_log(cnf, M_UPDATE, W_USER, "NIS maps updated");
1811
1812         return (EXIT_SUCCESS);
1813 }