usr.sbin/pw/pw_user.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause
   3  *
   4  * Copyright (C) 1996
   5  *      David L. Nugent.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  */
  29
  30 #include <sys/param.h>
  31 #include <sys/types.h>
  32
  33 #include <assert.h>
  34 #include <ctype.h>
  35 #include <dirent.h>
  36 #include <err.h>
  37 #include <errno.h>
  38 #include <fcntl.h>
  39 #include <grp.h>
  40 #include <pwd.h>
  41 #include <libutil.h>
  42 #include <login_cap.h>
  43 #include <paths.h>
  44 #include <string.h>
  45 #include <sysexits.h>
  46 #include <termios.h>
  47 #include <unistd.h>
  48 #include <spawn.h>
  49
  50 #include "pw.h"
  51 #include "bitmap.h"
  52 #include "psdate.h"
  53
  54 #define LOGNAMESIZE (MAXLOGNAME-1)
  55
  56 extern char **environ;
  57 static          char locked_str[] = "*LOCKED*";
  58
  59 static struct passwd fakeuser = {
  60         "nouser",
  61         "*",
  62         -1,
  63         -1,
  64         0,
  65         "",
  66         "User &",
  67         "/nonexistent",
  68         "/bin/sh",
  69         0,
  70         0
  71 };
  72
  73 static int       print_user(struct passwd *pwd, bool pretty, bool v7);
  74 static uid_t     pw_uidpolicy(struct userconf *cnf, intmax_t id);
  75 static uid_t     pw_gidpolicy(struct userconf *cnf, char *grname, char *nam,
  76     gid_t prefer, bool dryrun);
  77 static char     *pw_homepolicy(struct userconf * cnf, char *homedir,
  78     const char *user);
  79 static char     *pw_shellpolicy(struct userconf * cnf);
  80 static char     *pw_password(struct userconf * cnf, char const * user);
  81 static char     *shell_path(char const * path, char *shells[], char *sh);
  82 static void     rmat(uid_t uid);
  83
  84 static void
  85 mkdir_home_parents(int dfd, const char *dir)
  86 {
  87         struct stat st;
  88         char *dirs, *tmp;
  89
  90         if (*dir != '/')
  91                 errx(EX_DATAERR, "invalid base directory for home '%s'", dir);
  92
  93         dir++;
  94
  95         if (fstatat(dfd, dir, &st, 0) != -1) {
  96                 if (S_ISDIR(st.st_mode))
  97                         return;
  98                 errx(EX_OSFILE, "root home `/%s' is not a directory", dir);
  99         }
 100
 101         dirs = strdup(dir);
 102         if (dirs == NULL)
 103                 errx(EX_UNAVAILABLE, "out of memory");
 104
 105         tmp = strrchr(dirs, '/');
 106         if (tmp == NULL) {
 107                 free(dirs);
 108                 return;
 109         }
 110         tmp[0] = '\0';
 111
 112         tmp = dirs;
 113         if (fstatat(dfd, dirs, &st, 0) == -1) {
 114                 while ((tmp = strchr(tmp + 1, '/')) != NULL) {
 115                         *tmp = '\0';
 116                         if (fstatat(dfd, dirs, &st, 0) == -1) {
 117                                 if (mkdirat(dfd, dirs, _DEF_DIRMODE) == -1)
 118                                         err(EX_OSFILE,  "'%s' (home parent) is not a directory", dirs);
 119                         }
 120                         *tmp = '/';
 121                 }
 122         }
 123         if (fstatat(dfd, dirs, &st, 0) == -1) {
 124                 if (mkdirat(dfd, dirs, _DEF_DIRMODE) == -1)
 125                         err(EX_OSFILE,  "'%s' (home parent) is not a directory", dirs);
 126                 fchownat(dfd, dirs, 0, 0, 0);
 127         }
 128
 129         free(dirs);
 130 }
 131
 132 static void
 133 create_and_populate_homedir(struct userconf *cnf, struct passwd *pwd,
 134     const char *skeldir, mode_t homemode, bool update)
 135 {
 136         int skelfd = -1;
 137
 138         /* Create home parents directories */
 139         mkdir_home_parents(conf.rootfd, pwd->pw_dir);
 140
 141         if (skeldir != NULL && *skeldir != '\0') {
 142                 if (*skeldir == '/')
 143                         skeldir++;
 144                 skelfd = openat(conf.rootfd, skeldir, O_DIRECTORY|O_CLOEXEC);
 145         }
 146
 147         copymkdir(conf.rootfd, pwd->pw_dir, skelfd, homemode, pwd->pw_uid,
 148             pwd->pw_gid, 0);
 149         pw_log(cnf, update ? M_UPDATE : M_ADD, W_USER, "%s(%ju) home %s made",
 150             pwd->pw_name, (uintmax_t)pwd->pw_uid, pwd->pw_dir);
 151 }
 152
 153 static int
 154 pw_set_passwd(struct passwd *pwd, int fd, bool precrypted, bool update)
 155 {
 156         int              b, istty;
 157         struct termios   t, n;
 158         login_cap_t     *lc;
 159         char            line[_PASSWORD_LEN+1];
 160         char            *p;
 161
 162         if (fd == '-') {
 163                 if (!pwd->pw_passwd || *pwd->pw_passwd != '*') {
 164                         pwd->pw_passwd = "*";   /* No access */
 165                         return (1);
 166                 }
 167                 return (0);
 168         }
 169
 170         if ((istty = isatty(fd))) {
 171                 if (tcgetattr(fd, &t) == -1)
 172                         istty = 0;
 173                 else {
 174                         n = t;
 175                         n.c_lflag &= ~(ECHO);
 176                         tcsetattr(fd, TCSANOW, &n);
 177                         printf("%s%spassword for user %s:",
 178                             update ? "new " : "",
 179                             precrypted ? "encrypted " : "",
 180                             pwd->pw_name);
 181                         fflush(stdout);
 182                 }
 183         }
 184         b = read(fd, line, sizeof(line) - 1);
 185         if (istty) {    /* Restore state */
 186                 tcsetattr(fd, TCSANOW, &t);
 187                 fputc('\n', stdout);
 188                 fflush(stdout);
 189         }
 190
 191         if (b < 0)
 192                 err(EX_IOERR, "-%c file descriptor",
 193                     precrypted ? 'H' : 'h');
 194         line[b] = '\0';
 195         if ((p = strpbrk(line, "\r\n")) != NULL)
 196                 *p = '\0';
 197         if (!*line)
 198                 errx(EX_DATAERR, "empty password read on file descriptor %d",
 199                     fd);
 200         if (precrypted) {
 201                 if (strchr(line, ':') != NULL)
 202                         errx(EX_DATAERR, "bad encrypted password");
 203                 pwd->pw_passwd = strdup(line);
 204         } else {
 205                 lc = login_getpwclass(pwd);
 206                 if (lc == NULL ||
 207                                 login_setcryptfmt(lc, "sha512", NULL) == NULL)
 208                         warn("setting crypt(3) format");
 209                 login_close(lc);
 210                 pwd->pw_passwd = pw_pwcrypt(line);
 211         }
 212         return (1);
 213 }
 214
 215 static void
 216 perform_chgpwent(const char *name, struct passwd *pwd, char *nispasswd)
 217 {
 218         int rc;
 219         struct passwd *nispwd;
 220
 221         /* duplicate for nis so that chgpwent is not modifying before NIS */
 222         if (nispasswd && *nispasswd == '/')
 223                 nispwd = pw_dup(pwd);
 224
 225         rc = chgpwent(name, pwd);
 226         if (rc == -1)
 227                 errx(EX_IOERR, "user '%s' does not exist (NIS?)", pwd->pw_name);
 228         else if (rc != 0)
 229                 err(EX_IOERR, "passwd file update");
 230
 231         if (nispasswd && *nispasswd == '/') {
 232                 rc = chgnispwent(nispasswd, name, nispwd);
 233                 if (rc == -1)
 234                         warn("User '%s' not found in NIS passwd", pwd->pw_name);
 235                 else if (rc != 0)
 236                         warn("NIS passwd update");
 237                 /* NOTE: NIS-only update errors are not fatal */
 238         }
 239 }
 240
 241 /*
 242  * The M_LOCK and M_UNLOCK functions simply add or remove
 243  * a "*LOCKED*" prefix from in front of the password to
 244  * prevent it decoding correctly, and therefore prevents
 245  * access. Of course, this only prevents access via
 246  * password authentication (not ssh, kerberos or any
 247  * other method that does not use the UNIX password) but
 248  * that is a known limitation.
 249  */
 250 static int
 251 pw_userlock(char *arg1, int mode)
 252 {
 253         struct passwd *pwd = NULL;
 254         char *passtmp = NULL;
 255         char *name;
 256         bool locked = false;
 257         uid_t id = (uid_t)-1;
 258
 259         if (geteuid() != 0)
 260                 errx(EX_NOPERM, "you must be root");
 261
 262         if (arg1 == NULL)
 263                 errx(EX_DATAERR, "username or id required");
 264
 265         name = arg1;
 266         if (arg1[strspn(name, "0123456789")] == '\0')
 267                 id = pw_checkid(name, UID_MAX);
 268
 269         pwd = GETPWNAM(pw_checkname(name, 0));
 270         if (pwd == NULL && id != (uid_t)-1) {
 271                 pwd = GETPWUID(id);
 272                 if (pwd != NULL)
 273                         name = pwd->pw_name;
 274         }
 275         if (pwd == NULL) {
 276                 if (id == (uid_t)-1)
 277                         errx(EX_NOUSER, "no such name or uid `%ju'", (uintmax_t) id);
 278                 errx(EX_NOUSER, "no such user `%s'", name);
 279         }
 280
 281         if (name == NULL)
 282                 name = pwd->pw_name;
 283
 284         if (strncmp(pwd->pw_passwd, locked_str, sizeof(locked_str) -1) == 0)
 285                 locked = true;
 286         if (mode == M_LOCK && locked)
 287                 errx(EX_DATAERR, "user '%s' is already locked", pwd->pw_name);
 288         if (mode == M_UNLOCK && !locked)
 289                 errx(EX_DATAERR, "user '%s' is not locked", pwd->pw_name);
 290
 291         if (mode == M_LOCK) {
 292                 asprintf(&passtmp, "%s%s", locked_str, pwd->pw_passwd);
 293                 if (passtmp == NULL)    /* disaster */
 294                         errx(EX_UNAVAILABLE, "out of memory");
 295                 pwd->pw_passwd = passtmp;
 296         } else {
 297                 pwd->pw_passwd += sizeof(locked_str)-1;
 298         }
 299
 300         perform_chgpwent(name, pwd, NULL);
 301         free(passtmp);
 302
 303         return (EXIT_SUCCESS);
 304 }
 305
 306 static uid_t
 307 pw_uidpolicy(struct userconf * cnf, intmax_t id)
 308 {
 309         struct passwd  *pwd;
 310         struct bitmap   bm;
 311         uid_t           uid = (uid_t) - 1;
 312
 313         /*
 314          * Check the given uid, if any
 315          */
 316         if (id >= 0) {
 317                 uid = (uid_t) id;
 318
 319                 if ((pwd = GETPWUID(uid)) != NULL && conf.checkduplicate)
 320                         errx(EX_DATAERR, "uid `%ju' has already been allocated",
 321                             (uintmax_t)pwd->pw_uid);
 322                 return (uid);
 323         }
 324         /*
 325          * We need to allocate the next available uid under one of
 326          * two policies a) Grab the first unused uid b) Grab the
 327          * highest possible unused uid
 328          */
 329         if (cnf->min_uid >= cnf->max_uid) {     /* Sanity
 330                                                  * claus^H^H^H^Hheck */
 331                 cnf->min_uid = 1000;
 332                 cnf->max_uid = 32000;
 333         }
 334         bm = bm_alloc(cnf->max_uid - cnf->min_uid + 1);
 335
 336         /*
 337          * Now, let's fill the bitmap from the password file
 338          */
 339         SETPWENT();
 340         while ((pwd = GETPWENT()) != NULL)
 341                 if (pwd->pw_uid >= (uid_t) cnf->min_uid && pwd->pw_uid <= (uid_t) cnf->max_uid)
 342                         bm_setbit(&bm, pwd->pw_uid - cnf->min_uid);
 343         ENDPWENT();
 344
 345         /*
 346          * Then apply the policy, with fallback to reuse if necessary
 347          */
 348         if (cnf->reuse_uids || (uid = (uid_t) (bm_lastset(&bm) + cnf->min_uid + 1)) > cnf->max_uid)
 349                 uid = (uid_t) (bm_firstunset(&bm) + cnf->min_uid);
 350
 351         /*
 352          * Another sanity check
 353          */
 354         if (uid < cnf->min_uid || uid > cnf->max_uid)
 355                 errx(EX_SOFTWARE, "unable to allocate a new uid - range fully used");
 356         bm_dealloc(&bm);
 357         return (uid);
 358 }
 359
 360 static uid_t
 361 pw_gidpolicy(struct userconf *cnf, char *grname, char *nam, gid_t prefer, bool dryrun)
 362 {
 363         struct group   *grp;
 364         gid_t           gid = (uid_t) - 1;
 365
 366         /*
 367          * Check the given gid, if any
 368          */
 369         SETGRENT();
 370         if (grname) {
 371                 if ((grp = GETGRNAM(grname)) == NULL) {
 372                         gid = pw_checkid(grname, GID_MAX);
 373                         grp = GETGRGID(gid);
 374                 }
 375                 gid = grp->gr_gid;
 376         } else if ((grp = GETGRNAM(nam)) != NULL) {
 377                 gid = grp->gr_gid;  /* Already created? Use it anyway... */
 378         } else {
 379                 intmax_t                grid = -1;
 380
 381                 /*
 382                  * We need to auto-create a group with the user's name. We
 383                  * can send all the appropriate output to our sister routine
 384                  * bit first see if we can create a group with gid==uid so we
 385                  * can keep the user and group ids in sync. We purposely do
 386                  * NOT check the gid range if we can force the sync. If the
 387                  * user's name dups an existing group, then the group add
 388                  * function will happily handle that case for us and exit.
 389                  */
 390                 if (GETGRGID(prefer) == NULL)
 391                         grid = prefer;
 392                 if (dryrun) {
 393                         gid = pw_groupnext(cnf, true);
 394                 } else {
 395                         if (grid == -1)
 396                                 grid =  pw_groupnext(cnf, true);
 397                         groupadd(cnf, nam, grid, NULL, -1, false, false, false);
 398                         if ((grp = GETGRNAM(nam)) != NULL)
 399                                 gid = grp->gr_gid;
 400                 }
 401         }
 402         ENDGRENT();
 403         return (gid);
 404 }
 405
 406 static char *
 407 pw_homepolicy(struct userconf * cnf, char *homedir, const char *user)
 408 {
 409         static char     home[128];
 410
 411         if (homedir)
 412                 return (homedir);
 413
 414         if (cnf->home == NULL || *cnf->home == '\0')
 415                 errx(EX_CONFIG, "no base home directory set");
 416         snprintf(home, sizeof(home), "%s/%s", cnf->home, user);
 417
 418         return (home);
 419 }
 420
 421 static char *
 422 shell_path(char const * path, char *shells[], char *sh)
 423 {
 424         if (sh != NULL && (*sh == '/' || *sh == '\0'))
 425                 return sh;      /* specified full path or forced none */
 426         else {
 427                 char           *p;
 428                 char            paths[_UC_MAXLINE];
 429
 430                 /*
 431                  * We need to search paths
 432                  */
 433                 strlcpy(paths, path, sizeof(paths));
 434                 for (p = strtok(paths, ": \t\r\n"); p != NULL; p = strtok(NULL, ": \t\r\n")) {
 435                         int             i;
 436                         static char     shellpath[256];
 437
 438                         if (sh != NULL) {
 439                                 snprintf(shellpath, sizeof(shellpath), "%s/%s", p, sh);
 440                                 if (access(shellpath, X_OK) == 0)
 441                                         return shellpath;
 442                         } else
 443                                 for (i = 0; i < _UC_MAXSHELLS && shells[i] != NULL; i++) {
 444                                         snprintf(shellpath, sizeof(shellpath), "%s/%s", p, shells[i]);
 445                                         if (access(shellpath, X_OK) == 0)
 446                                                 return shellpath;
 447                                 }
 448                 }
 449                 if (sh == NULL)
 450                         errx(EX_OSFILE, "can't find shell `%s' in shell paths", sh);
 451                 errx(EX_CONFIG, "no default shell available or defined");
 452                 return NULL;
 453         }
 454 }
 455
 456 static char *
 457 pw_shellpolicy(struct userconf * cnf)
 458 {
 459
 460         return shell_path(cnf->shelldir, cnf->shells, cnf->shell_default);
 461 }
 462
 463 #define SALTSIZE        32
 464
 465 static char const chars[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ./";
 466
 467 char *
 468 pw_pwcrypt(char *password)
 469 {
 470         int             i;
 471         char            salt[SALTSIZE + 1];
 472         char            *cryptpw;
 473         static char     buf[256];
 474         size_t          pwlen;
 475
 476         /*
 477          * Calculate a salt value
 478          */
 479         for (i = 0; i < SALTSIZE; i++)
 480                 salt[i] = chars[arc4random_uniform(sizeof(chars) - 1)];
 481         salt[SALTSIZE] = '\0';
 482
 483         cryptpw = crypt(password, salt);
 484         if (cryptpw == NULL)
 485                 errx(EX_CONFIG, "crypt(3) failure");
 486         pwlen = strlcpy(buf, cryptpw, sizeof(buf));
 487         assert(pwlen < sizeof(buf));
 488         return (buf);
 489 }
 490
 491 static char *
 492 pw_password(struct userconf * cnf, char const * user)
 493 {
 494         int             i, l;
 495         char            pwbuf[32];
 496
 497         switch (cnf->default_password) {
 498         case P_NONE:            /* No password at all! */
 499                 return "";
 500         case P_RANDOM:                  /* Random password */
 501                 l = (arc4random() % 8 + 8);     /* 8 - 16 chars */
 502                 for (i = 0; i < l; i++)
 503                         pwbuf[i] = chars[arc4random_uniform(sizeof(chars)-1)];
 504                 pwbuf[i] = '\0';
 505
 506                 /*
 507                  * We give this information back to the user
 508                  */
 509                 if (conf.fd == -1) {
 510                         if (isatty(STDOUT_FILENO))
 511                                 printf("Password for '%s' is: ", user);
 512                         printf("%s\n", pwbuf);
 513                         fflush(stdout);
 514                 }
 515                 break;
 516         case P_YES:             /* user's name */
 517                 strlcpy(pwbuf, user, sizeof(pwbuf));
 518                 break;
 519         case P_NO:              /* No login - default */
 520                                 /* FALLTHROUGH */
 521         default:
 522                 return "*";
 523         }
 524         return pw_pwcrypt(pwbuf);
 525 }
 526
 527 static int
 528 print_user(struct passwd * pwd, bool pretty, bool v7)
 529 {
 530         int             j;
 531         char           *p;
 532         struct group   *grp = GETGRGID(pwd->pw_gid);
 533         char            uname[60] = "User &", office[60] = "[None]",
 534                         wphone[60] = "[None]", hphone[60] = "[None]";
 535         char            acexpire[32] = "[None]", pwexpire[32] = "[None]";
 536         struct tm *    tptr;
 537
 538         if (!pretty) {
 539                 p = v7 ? pw_make_v7(pwd) : pw_make(pwd);
 540                 printf("%s\n", p);
 541                 free(p);
 542                 return (EXIT_SUCCESS);
 543         }
 544
 545         if ((p = strtok(pwd->pw_gecos, ",")) != NULL) {
 546                 strlcpy(uname, p, sizeof(uname));
 547                 if ((p = strtok(NULL, ",")) != NULL) {
 548                         strlcpy(office, p, sizeof(office));
 549                         if ((p = strtok(NULL, ",")) != NULL) {
 550                                 strlcpy(wphone, p, sizeof(wphone));
 551                                 if ((p = strtok(NULL, "")) != NULL) {
 552                                         strlcpy(hphone, p, sizeof(hphone));
 553                                 }
 554                         }
 555                 }
 556         }
 557         /*
 558          * Handle '&' in gecos field
 559          */
 560         if ((p = strchr(uname, '&')) != NULL) {
 561                 int             l = strlen(pwd->pw_name);
 562                 int             m = strlen(p);
 563
 564                 memmove(p + l, p + 1, m);
 565                 memmove(p, pwd->pw_name, l);
 566                 *p = (char) toupper((unsigned char)*p);
 567         }
 568         if (pwd->pw_expire > (time_t)0 && (tptr = localtime(&pwd->pw_expire)) != NULL)
 569                 strftime(acexpire, sizeof acexpire, "%c", tptr);
 570         if (pwd->pw_change > (time_t)0 && (tptr = localtime(&pwd->pw_change)) != NULL)
 571                 strftime(pwexpire, sizeof pwexpire, "%c", tptr);
 572         printf("Login Name: %-15s   #%-12ju Group: %-15s   #%ju\n"
 573                " Full Name: %s\n"
 574                "      Home: %-26.26s      Class: %s\n"
 575                "     Shell: %-26.26s     Office: %s\n"
 576                "Work Phone: %-26.26s Home Phone: %s\n"
 577                "Acc Expire: %-26.26s Pwd Expire: %s\n",
 578                pwd->pw_name, (uintmax_t)pwd->pw_uid,
 579                grp ? grp->gr_name : "(invalid)", (uintmax_t)pwd->pw_gid,
 580                uname, pwd->pw_dir, pwd->pw_class,
 581                pwd->pw_shell, office, wphone, hphone,
 582                acexpire, pwexpire);
 583         SETGRENT();
 584         j = 0;
 585         while ((grp=GETGRENT()) != NULL) {
 586                 int     i = 0;
 587                 if (grp->gr_mem != NULL) {
 588                         while (grp->gr_mem[i] != NULL) {
 589                                 if (strcmp(grp->gr_mem[i], pwd->pw_name)==0) {
 590                                         printf(j++ == 0 ? "    Groups: %s" : ",%s", grp->gr_name);
 591                                         break;
 592                                 }
 593                                 ++i;
 594                         }
 595                 }
 596         }
 597         ENDGRENT();
 598         printf("%s", j ? "\n" : "");
 599         return (EXIT_SUCCESS);
 600 }
 601
 602 char *
 603 pw_checkname(char *name, int gecos)
 604 {
 605         char showch[8];
 606         const char *badchars, *ch, *showtype;
 607         int reject;
 608
 609         ch = name;
 610         reject = 0;
 611         if (gecos) {
 612                 /* See if the name is valid as a gecos (comment) field. */
 613                 badchars = ":";
 614                 showtype = "gecos field";
 615         } else {
 616                 /* See if the name is valid as a userid or group. */
 617                 badchars = " ,\t:+&#%$^()!@~*?<>=|\\/\";";
 618                 showtype = "userid/group name";
 619                 /* Userids and groups can not have a leading '-'. */
 620                 if (*ch == '-')
 621                         reject = 1;
 622         }
 623         if (!reject) {
 624                 while (*ch) {
 625                         if (strchr(badchars, *ch) != NULL ||
 626                             (!gecos && *ch < ' ') ||
 627                             *ch == 127) {
 628                                 reject = 1;
 629                                 break;
 630                         }
 631                         /* 8-bit characters are only allowed in GECOS fields */
 632                         if (!gecos && (*ch & 0x80)) {
 633                                 reject = 1;
 634                                 break;
 635                         }
 636                         ch++;
 637                 }
 638         }
 639         /*
 640          * A `$' is allowed as the final character for userids and groups,
 641          * mainly for the benefit of samba.
 642          */
 643         if (reject && !gecos) {
 644                 if (*ch == '$' && *(ch + 1) == '\0') {
 645                         reject = 0;
 646                         ch++;
 647                 }
 648         }
 649         if (reject) {
 650                 snprintf(showch, sizeof(showch), (*ch >= ' ' && *ch < 127)
 651                     ? "`%c'" : "0x%02x", *ch);
 652                 errx(EX_DATAERR, "invalid character %s at position %td in %s",
 653                     showch, (ch - name), showtype);
 654         }
 655         if (!gecos && (ch - name) > LOGNAMESIZE)
 656                 errx(EX_USAGE, "name too long `%s' (max is %d)", name,
 657                     LOGNAMESIZE);
 658
 659         return (name);
 660 }
 661
 662 static void
 663 rmat(uid_t uid)
 664 {
 665         DIR            *d = opendir("/var/at/jobs");
 666
 667         if (d != NULL) {
 668                 struct dirent  *e;
 669
 670                 while ((e = readdir(d)) != NULL) {
 671                         struct stat     st;
 672
 673                         if (strncmp(e->d_name, ".lock", 5) != 0 &&
 674                             stat(e->d_name, &st) == 0 &&
 675                             !S_ISDIR(st.st_mode) &&
 676                             st.st_uid == uid) {
 677                                 const char *argv[] = {
 678                                         "/usr/sbin/atrm",
 679                                         e->d_name,
 680                                         NULL
 681                                 };
 682                                 if (posix_spawn(NULL, argv[0], NULL, NULL,
 683                                     (char *const *) argv, environ)) {
 684                                         warn("Failed to execute '%s %s'",
 685                                             argv[0], argv[1]);
 686                                 }
 687                         }
 688                 }
 689                 closedir(d);
 690         }
 691 }
 692
 693 int
 694 pw_user_next(int argc, char **argv, char *name __unused)
 695 {
 696         struct userconf *cnf = NULL;
 697         const char *cfg = NULL;
 698         int ch;
 699         bool quiet = false;
 700         uid_t next;
 701
 702         while ((ch = getopt(argc, argv, "C:q")) != -1) {
 703                 switch (ch) {
 704                 case 'C':
 705                         cfg = optarg;
 706                         break;
 707                 case 'q':
 708                         quiet = true;
 709                         break;
 710                 default:
 711                         exit(EX_USAGE);
 712                 }
 713         }
 714
 715         if (quiet)
 716                 freopen(_PATH_DEVNULL, "w", stderr);
 717
 718         cnf = get_userconfig(cfg);
 719
 720         next = pw_uidpolicy(cnf, -1);
 721
 722         printf("%ju:", (uintmax_t)next);
 723         pw_groupnext(cnf, quiet);
 724
 725         return (EXIT_SUCCESS);
 726 }
 727
 728 int
 729 pw_user_show(int argc, char **argv, char *arg1)
 730 {
 731         struct passwd *pwd = NULL;
 732         char *name = NULL;
 733         intmax_t id = -1;
 734         int ch;
 735         bool all = false;
 736         bool pretty = false;
 737         bool force = false;
 738         bool v7 = false;
 739         bool quiet = false;
 740
 741         if (arg1 != NULL) {
 742                 if (arg1[strspn(arg1, "0123456789")] == '\0')
 743                         id = pw_checkid(arg1, UID_MAX);
 744                 else
 745                         name = arg1;
 746         }
 747
 748         while ((ch = getopt(argc, argv, "C:qn:u:FPa7")) != -1) {
 749                 switch (ch) {
 750                 case 'C':
 751                         /* ignore compatibility */
 752                         break;
 753                 case 'q':
 754                         quiet = true;
 755                         break;
 756                 case 'n':
 757                         name = optarg;
 758                         break;
 759                 case 'u':
 760                         id = pw_checkid(optarg, UID_MAX);
 761                         break;
 762                 case 'F':
 763                         force = true;
 764                         break;
 765                 case 'P':
 766                         pretty = true;
 767                         break;
 768                 case 'a':
 769                         all = true;
 770                         break;
 771                 case '7':
 772                         v7 = true;
 773                         break;
 774                 default:
 775                         exit(EX_USAGE);
 776                 }
 777         }
 778
 779         if (quiet)
 780                 freopen(_PATH_DEVNULL, "w", stderr);
 781
 782         if (all) {
 783                 SETPWENT();
 784                 while ((pwd = GETPWENT()) != NULL)
 785                         print_user(pwd, pretty, v7);
 786                 ENDPWENT();
 787                 return (EXIT_SUCCESS);
 788         }
 789
 790         if (id < 0 && name == NULL)
 791                 errx(EX_DATAERR, "username or id required");
 792
 793         pwd = (name != NULL) ? GETPWNAM(pw_checkname(name, 0)) : GETPWUID(id);
 794         if (pwd == NULL) {
 795                 if (force) {
 796                         pwd = &fakeuser;
 797                 } else {
 798                         if (name == NULL)
 799                                 errx(EX_NOUSER, "no such uid `%ju'",
 800                                     (uintmax_t) id);
 801                         errx(EX_NOUSER, "no such user `%s'", name);
 802                 }
 803         }
 804
 805         return (print_user(pwd, pretty, v7));
 806 }
 807
 808 int
 809 pw_user_del(int argc, char **argv, char *arg1)
 810 {
 811         struct userconf *cnf = NULL;
 812         struct passwd *pwd = NULL;
 813         struct group *gr, *grp;
 814         char *name = NULL;
 815         char grname[MAXLOGNAME];
 816         char *nispasswd = NULL;
 817         char file[MAXPATHLEN];
 818         char home[MAXPATHLEN];
 819         const char *cfg = NULL;
 820         struct stat st;
 821         intmax_t id = -1;
 822         int ch, rc;
 823         bool nis = false;
 824         bool deletehome = false;
 825         bool quiet = false;
 826
 827         if (arg1 != NULL) {
 828                 if (arg1[strspn(arg1, "0123456789")] == '\0')
 829                         id = pw_checkid(arg1, UID_MAX);
 830                 else
 831                         name = arg1;
 832         }
 833
 834         while ((ch = getopt(argc, argv, "C:qn:u:rYy:")) != -1) {
 835                 switch (ch) {
 836                 case 'C':
 837                         cfg = optarg;
 838                         break;
 839                 case 'q':
 840                         quiet = true;
 841                         break;
 842                 case 'n':
 843                         name = optarg;
 844                         break;
 845                 case 'u':
 846                         id = pw_checkid(optarg, UID_MAX);
 847                         break;
 848                 case 'r':
 849                         deletehome = true;
 850                         break;
 851                 case 'y':
 852                         nispasswd = optarg;
 853                         break;
 854                 case 'Y':
 855                         nis = true;
 856                         break;
 857                 default:
 858                         exit(EX_USAGE);
 859                 }
 860         }
 861
 862         if (quiet)
 863                 freopen(_PATH_DEVNULL, "w", stderr);
 864
 865         if (id < 0 && name == NULL)
 866                 errx(EX_DATAERR, "username or id required");
 867
 868         cnf = get_userconfig(cfg);
 869
 870         if (nispasswd == NULL)
 871                 nispasswd = cnf->nispasswd;
 872
 873         pwd = (name != NULL) ? GETPWNAM(pw_checkname(name, 0)) : GETPWUID(id);
 874         if (pwd == NULL) {
 875                 if (name == NULL)
 876                         errx(EX_NOUSER, "no such uid `%ju'", (uintmax_t) id);
 877                 errx(EX_NOUSER, "no such user `%s'", name);
 878         }
 879
 880         if (PWF._altdir == PWF_REGULAR &&
 881             ((pwd->pw_fields & _PWF_SOURCE) != _PWF_FILES)) {
 882                 if ((pwd->pw_fields & _PWF_SOURCE) == _PWF_NIS) {
 883                         if (!nis && nispasswd && *nispasswd != '/')
 884                                 errx(EX_NOUSER, "Cannot remove NIS user `%s'",
 885                                     name);
 886                 } else {
 887                         errx(EX_NOUSER, "Cannot remove non local user `%s'",
 888                             name);
 889                 }
 890         }
 891
 892         id = pwd->pw_uid;
 893         if (name == NULL)
 894                 name = pwd->pw_name;
 895
 896         if (strcmp(pwd->pw_name, "root") == 0)
 897                 errx(EX_DATAERR, "cannot remove user 'root'");
 898
 899         if (!PWALTDIR()) {
 900                 /* Remove crontabs */
 901                 snprintf(file, sizeof(file), "/var/cron/tabs/%s", pwd->pw_name);
 902                 if (access(file, F_OK) == 0) {
 903                         const char *argv[] = {
 904                                 "crontab",
 905                                 "-u",
 906                                 pwd->pw_name,
 907                                 "-r",
 908                                 NULL
 909                         };
 910                         if (posix_spawnp(NULL, argv[0], NULL, NULL,
 911                                                 (char *const *) argv, environ)) {
 912                                 warn("Failed to execute '%s %s'",
 913                                                 argv[0], argv[1]);
 914                         }
 915                 }
 916         }
 917
 918         /*
 919          * Save these for later, since contents of pwd may be
 920          * invalidated by deletion
 921          */
 922         snprintf(file, sizeof(file), "%s/%s", _PATH_MAILDIR, pwd->pw_name);
 923         strlcpy(home, pwd->pw_dir, sizeof(home));
 924         gr = GETGRGID(pwd->pw_gid);
 925         if (gr != NULL)
 926                 strlcpy(grname, gr->gr_name, LOGNAMESIZE);
 927         else
 928                 grname[0] = '\0';
 929
 930         rc = delpwent(pwd);
 931         if (rc == -1)
 932                 err(EX_IOERR, "user '%s' does not exist", pwd->pw_name);
 933         else if (rc != 0)
 934                 err(EX_IOERR, "passwd update");
 935
 936         if (nis && nispasswd && *nispasswd=='/') {
 937                 rc = delnispwent(nispasswd, name);
 938                 if (rc == -1)
 939                         warnx("WARNING: user '%s' does not exist in NIS passwd",
 940                             pwd->pw_name);
 941                 else if (rc != 0)
 942                         warn("WARNING: NIS passwd update");
 943         }
 944
 945         grp = GETGRNAM(name);
 946         if (grp != NULL &&
 947             (grp->gr_mem == NULL || *grp->gr_mem == NULL) &&
 948             strcmp(name, grname) == 0)
 949                 delgrent(GETGRNAM(name));
 950         SETGRENT();
 951         while ((grp = GETGRENT()) != NULL) {
 952                 int i, j;
 953                 char group[MAXLOGNAME];
 954                 if (grp->gr_mem == NULL)
 955                         continue;
 956
 957                 for (i = 0; grp->gr_mem[i] != NULL; i++) {
 958                         if (strcmp(grp->gr_mem[i], name) != 0)
 959                                 continue;
 960
 961                         for (j = i; grp->gr_mem[j] != NULL; j++)
 962                                 grp->gr_mem[j] = grp->gr_mem[j+1];
 963                         strlcpy(group, grp->gr_name, MAXLOGNAME);
 964                         chggrent(group, grp);
 965                 }
 966         }
 967         ENDGRENT();
 968
 969         pw_log(cnf, M_DELETE, W_USER, "%s(%ju) account removed", name,
 970             (uintmax_t)id);
 971
 972         /* Remove mail file */
 973         if (PWALTDIR() != PWF_ALT)
 974                 unlinkat(conf.rootfd, file + 1, 0);
 975
 976         /* Remove at jobs */
 977         if (!PWALTDIR() && getpwuid(id) == NULL)
 978                 rmat(id);
 979
 980         /* Remove home directory and contents */
 981         if (PWALTDIR() != PWF_ALT && deletehome && *home == '/' &&
 982             GETPWUID(id) == NULL &&
 983             fstatat(conf.rootfd, home + 1, &st, 0) != -1) {
 984                 rm_r(conf.rootfd, home, id);
 985                 pw_log(cnf, M_DELETE, W_USER, "%s(%ju) home '%s' %s"
 986                     "removed", name, (uintmax_t)id, home,
 987                      fstatat(conf.rootfd, home + 1, &st, 0) == -1 ? "" : "not "
 988                      "completely ");
 989         }
 990
 991         return (EXIT_SUCCESS);
 992 }
 993
 994 int
 995 pw_user_lock(int argc, char **argv, char *arg1)
 996 {
 997         int ch;
 998
 999         while ((ch = getopt(argc, argv, "Cq")) != -1) {
1000                 switch (ch) {
1001                 case 'C':
1002                 case 'q':
1003                         /* compatibility */
1004                         break;
1005                 default:
1006                         exit(EX_USAGE);
1007                 }
1008         }
1009
1010         return (pw_userlock(arg1, M_LOCK));
1011 }
1012
1013 int
1014 pw_user_unlock(int argc, char **argv, char *arg1)
1015 {
1016         int ch;
1017
1018         while ((ch = getopt(argc, argv, "Cq")) != -1) {
1019                 switch (ch) {
1020                 case 'C':
1021                 case 'q':
1022                         /* compatibility */
1023                         break;
1024                 default:
1025                         exit(EX_USAGE);
1026                 }
1027         }
1028
1029         return (pw_userlock(arg1, M_UNLOCK));
1030 }
1031
1032 static struct group *
1033 group_from_name_or_id(char *name)
1034 {
1035         const char *errstr = NULL;
1036         struct group *grp;
1037         uintmax_t id;
1038
1039         if ((grp = GETGRNAM(name)) == NULL) {
1040                 id = strtounum(name, 0, GID_MAX, &errstr);
1041                 if (errstr)
1042                         errx(EX_NOUSER, "group `%s' does not exist", name);
1043                 grp = GETGRGID(id);
1044                 if (grp == NULL)
1045                         errx(EX_NOUSER, "group `%s' does not exist", name);
1046         }
1047
1048         return (grp);
1049 }
1050
1051 static void
1052 split_groups(StringList **groups, char *groupsstr)
1053 {
1054         struct group *grp;
1055         char *p;
1056         char tok[] = ", \t";
1057
1058         if (*groups == NULL)
1059                 *groups = sl_init();
1060         for (p = strtok(groupsstr, tok); p != NULL; p = strtok(NULL, tok)) {
1061                 grp = group_from_name_or_id(p);
1062                 sl_add(*groups, newstr(grp->gr_name));
1063         }
1064 }
1065
1066 static void
1067 validate_grname(struct userconf *cnf, char *group)
1068 {
1069         struct group *grp;
1070
1071         if (group == NULL || *group == '\0') {
1072                 cnf->default_group = "";
1073                 return;
1074         }
1075         grp = group_from_name_or_id(group);
1076         cnf->default_group = newstr(grp->gr_name);
1077 }
1078
1079 static mode_t
1080 validate_mode(char *mode)
1081 {
1082         mode_t m;
1083         void *set;
1084
1085         if ((set = setmode(mode)) == NULL)
1086                 errx(EX_DATAERR, "invalid directory creation mode '%s'", mode);
1087
1088         m = getmode(set, _DEF_DIRMODE);
1089         free(set);
1090         return (m);
1091 }
1092
1093 static long
1094 validate_expire(char *str, int opt)
1095 {
1096         if (!numerics(str))
1097                 errx(EX_DATAERR, "-%c argument must be numeric "
1098                      "when setting defaults: %s", (char)opt, str);
1099         return strtol(str, NULL, 0);
1100 }
1101
1102 static void
1103 mix_config(struct userconf *cmdcnf, struct userconf *cfg)
1104 {
1105
1106         if (cmdcnf->default_password < 0)
1107                 cmdcnf->default_password = cfg->default_password;
1108         if (cmdcnf->reuse_uids == 0)
1109                 cmdcnf->reuse_uids = cfg->reuse_uids;
1110         if (cmdcnf->reuse_gids == 0)
1111                 cmdcnf->reuse_gids = cfg->reuse_gids;
1112         if (cmdcnf->nispasswd == NULL)
1113                 cmdcnf->nispasswd = cfg->nispasswd;
1114         if (cmdcnf->dotdir == NULL)
1115                 cmdcnf->dotdir = cfg->dotdir;
1116         if (cmdcnf->newmail == NULL)
1117                 cmdcnf->newmail = cfg->newmail;
1118         if (cmdcnf->logfile == NULL)
1119                 cmdcnf->logfile = cfg->logfile;
1120         if (cmdcnf->home == NULL)
1121                 cmdcnf->home = cfg->home;
1122         if (cmdcnf->homemode == 0)
1123                 cmdcnf->homemode = cfg->homemode;
1124         if (cmdcnf->shelldir == NULL)
1125                 cmdcnf->shelldir = cfg->shelldir;
1126         if (cmdcnf->shells == NULL)
1127                 cmdcnf->shells = cfg->shells;
1128         if (cmdcnf->shell_default == NULL)
1129                 cmdcnf->shell_default = cfg->shell_default;
1130         if (cmdcnf->default_group == NULL)
1131                 cmdcnf->default_group = cfg->default_group;
1132         if (cmdcnf->groups == NULL)
1133                 cmdcnf->groups = cfg->groups;
1134         if (cmdcnf->default_class == NULL)
1135                 cmdcnf->default_class = cfg->default_class;
1136         if (cmdcnf->min_uid == 0)
1137                 cmdcnf->min_uid = cfg->min_uid;
1138         if (cmdcnf->max_uid == 0)
1139                 cmdcnf->max_uid = cfg->max_uid;
1140         if (cmdcnf->min_gid == 0)
1141                 cmdcnf->min_gid = cfg->min_gid;
1142         if (cmdcnf->max_gid == 0)
1143                 cmdcnf->max_gid = cfg->max_gid;
1144         if (cmdcnf->expire_days < 0)
1145                 cmdcnf->expire_days = cfg->expire_days;
1146         if (cmdcnf->password_days < 0)
1147                 cmdcnf->password_days = cfg->password_days;
1148 }
1149
1150 int
1151 pw_user_add(int argc, char **argv, char *arg1)
1152 {
1153         struct userconf *cnf, *cmdcnf;
1154         struct passwd *pwd;
1155         struct group *grp;
1156         struct stat st;
1157         char args[] = "C:qn:u:c:d:e:p:g:G:mM:k:s:oL:i:w:h:H:Db:NPy:Y";
1158         char line[_PASSWORD_LEN+1], path[MAXPATHLEN];
1159         char *gecos, *homedir, *skel, *walk, *userid, *groupid, *grname;
1160         char *default_passwd, *name, *p;
1161         const char *cfg = NULL;
1162         login_cap_t *lc;
1163         FILE *pfp, *fp;
1164         intmax_t id = -1;
1165         time_t now;
1166         int rc, ch, fd = -1;
1167         size_t i;
1168         bool dryrun, nis, pretty, quiet, createhome, precrypted, genconf;
1169
1170         dryrun = nis = pretty = quiet = createhome = precrypted = false;
1171         genconf = false;
1172         gecos = homedir = skel = userid = groupid = default_passwd = NULL;
1173         grname = name = NULL;
1174
1175         if ((cmdcnf = calloc(1, sizeof(struct userconf))) == NULL)
1176                 err(EXIT_FAILURE, "calloc()");
1177
1178         cmdcnf->default_password = cmdcnf->expire_days = cmdcnf->password_days = -1;
1179         now = time(NULL);
1180
1181         if (arg1 != NULL) {
1182                 if (arg1[strspn(arg1, "0123456789")] == '\0')
1183                         id = pw_checkid(arg1, UID_MAX);
1184                 else
1185                         name = pw_checkname(arg1, 0);
1186         }
1187
1188         while ((ch = getopt(argc, argv, args)) != -1) {
1189                 switch (ch) {
1190                 case 'C':
1191                         cfg = optarg;
1192                         break;
1193                 case 'q':
1194                         quiet = true;
1195                         break;
1196                 case 'n':
1197                         name = pw_checkname(optarg, 0);
1198                         break;
1199                 case 'u':
1200                         userid = optarg;
1201                         break;
1202                 case 'c':
1203                         gecos = pw_checkname(optarg, 1);
1204                         break;
1205                 case 'd':
1206                         homedir = optarg;
1207                         break;
1208                 case 'e':
1209                         if (genconf)
1210                             cmdcnf->expire_days = validate_expire(optarg, ch);
1211                         else
1212                             cmdcnf->expire_days = parse_date(now, optarg);
1213                         break;
1214                 case 'p':
1215                         if (genconf)
1216                             cmdcnf->password_days = validate_expire(optarg, ch);
1217                         else
1218                             cmdcnf->password_days = parse_date(now, optarg);
1219                         break;
1220                 case 'g':
1221                         validate_grname(cmdcnf, optarg);
1222                         grname = optarg;
1223                         break;
1224                 case 'G':
1225                         split_groups(&cmdcnf->groups, optarg);
1226                         break;
1227                 case 'm':
1228                         createhome = true;
1229                         break;
1230                 case 'M':
1231                         cmdcnf->homemode = validate_mode(optarg);
1232                         break;
1233                 case 'k':
1234                         walk = skel = optarg;
1235                         if (*walk == '/')
1236                                 walk++;
1237                         if (fstatat(conf.rootfd, walk, &st, 0) == -1)
1238                                 errx(EX_OSFILE, "skeleton `%s' does not "
1239                                     "exists", skel);
1240                         if (!S_ISDIR(st.st_mode))
1241                                 errx(EX_OSFILE, "skeleton `%s' is not a "
1242                                     "directory", skel);
1243                         cmdcnf->dotdir = skel;
1244                         break;
1245                 case 's':
1246                         cmdcnf->shell_default = optarg;
1247                         break;
1248                 case 'o':
1249                         conf.checkduplicate = false;
1250                         break;
1251                 case 'L':
1252                         cmdcnf->default_class = pw_checkname(optarg, 0);
1253                         break;
1254                 case 'i':
1255                         groupid = optarg;
1256                         break;
1257                 case 'w':
1258                         default_passwd = optarg;
1259                         break;
1260                 case 'H':
1261                         if (fd != -1)
1262                                 errx(EX_USAGE, "'-h' and '-H' are mutually "
1263                                     "exclusive options");
1264                         fd = pw_checkfd(optarg);
1265                         precrypted = true;
1266                         if (fd == '-')
1267                                 errx(EX_USAGE, "-H expects a file descriptor");
1268                         break;
1269                 case 'h':
1270                         if (fd != -1)
1271                                 errx(EX_USAGE, "'-h' and '-H' are mutually "
1272                                     "exclusive options");
1273                         fd = pw_checkfd(optarg);
1274                         break;
1275                 case 'D':
1276                         genconf = true;
1277                         break;
1278                 case 'b':
1279                         cmdcnf->home = optarg;
1280                         break;
1281                 case 'N':
1282                         dryrun = true;
1283                         break;
1284                 case 'P':
1285                         pretty = true;
1286                         break;
1287                 case 'y':
1288                         cmdcnf->nispasswd = optarg;
1289                         break;
1290                 case 'Y':
1291                         nis = true;
1292                         break;
1293                 default:
1294                         exit(EX_USAGE);
1295                 }
1296         }
1297
1298         if (geteuid() != 0 && ! dryrun)
1299                 errx(EX_NOPERM, "you must be root");
1300
1301         if (quiet)
1302                 freopen(_PATH_DEVNULL, "w", stderr);
1303
1304         cnf = get_userconfig(cfg);
1305
1306         mix_config(cmdcnf, cnf);
1307         if (default_passwd)
1308                 cmdcnf->default_password = passwd_val(default_passwd,
1309                     cnf->default_password);
1310         if (genconf) {
1311                 if (name != NULL)
1312                         errx(EX_DATAERR, "can't combine `-D' with `-n name'");
1313                 if (userid != NULL) {
1314                         if ((p = strtok(userid, ", \t")) != NULL)
1315                                 cmdcnf->min_uid = pw_checkid(p, UID_MAX);
1316                         if (cmdcnf->min_uid == 0)
1317                                 cmdcnf->min_uid = 1000;
1318                         if ((p = strtok(NULL, " ,\t")) != NULL)
1319                                 cmdcnf->max_uid = pw_checkid(p, UID_MAX);
1320                         if (cmdcnf->max_uid == 0)
1321                                 cmdcnf->max_uid = 32000;
1322                 }
1323                 if (groupid != NULL) {
1324                         if ((p = strtok(groupid, ", \t")) != NULL)
1325                                 cmdcnf->min_gid = pw_checkid(p, GID_MAX);
1326                         if (cmdcnf->min_gid == 0)
1327                                 cmdcnf->min_gid = 1000;
1328                         if ((p = strtok(NULL, " ,\t")) != NULL)
1329                                 cmdcnf->max_gid = pw_checkid(p, GID_MAX);
1330                         if (cmdcnf->max_gid == 0)
1331                                 cmdcnf->max_gid = 32000;
1332                 }
1333                 if (write_userconfig(cmdcnf, cfg))
1334                         return (EXIT_SUCCESS);
1335                 err(EX_IOERR, "config update");
1336         }
1337
1338         if (userid)
1339                 id = pw_checkid(userid, UID_MAX);
1340         if (id < 0 && name == NULL)
1341                 errx(EX_DATAERR, "user name or id required");
1342
1343         if (name == NULL)
1344                 errx(EX_DATAERR, "login name required");
1345
1346         if (GETPWNAM(name) != NULL)
1347                 errx(EX_DATAERR, "login name `%s' already exists", name);
1348
1349         if (!grname)
1350                 grname = cmdcnf->default_group;
1351
1352         pwd = &fakeuser;
1353         pwd->pw_name = name;
1354         pwd->pw_class = cmdcnf->default_class ? cmdcnf->default_class : "";
1355         pwd->pw_uid = pw_uidpolicy(cmdcnf, id);
1356         pwd->pw_gid = pw_gidpolicy(cnf, grname, pwd->pw_name,
1357             (gid_t) pwd->pw_uid, dryrun);
1358
1359         /* cmdcnf->password_days and cmdcnf->expire_days hold unixtime here */
1360         if (cmdcnf->password_days > 0)
1361                 pwd->pw_change = cmdcnf->password_days;
1362         if (cmdcnf->expire_days > 0)
1363                 pwd->pw_expire = cmdcnf->expire_days;
1364
1365         pwd->pw_dir = pw_homepolicy(cmdcnf, homedir, pwd->pw_name);
1366         pwd->pw_shell = pw_shellpolicy(cmdcnf);
1367         lc = login_getpwclass(pwd);
1368         if (lc == NULL || login_setcryptfmt(lc, "sha512", NULL) == NULL)
1369                 warn("setting crypt(3) format");
1370         login_close(lc);
1371         pwd->pw_passwd = pw_password(cmdcnf, pwd->pw_name);
1372         if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0)
1373                 warnx("WARNING: new account `%s' has a uid of 0 "
1374                     "(superuser access!)", pwd->pw_name);
1375         if (gecos)
1376                 pwd->pw_gecos = gecos;
1377
1378         if (fd != -1)
1379                 pw_set_passwd(pwd, fd, precrypted, false);
1380
1381         if (dryrun)
1382                 return (print_user(pwd, pretty, false));
1383
1384         if ((rc = addpwent(pwd)) != 0) {
1385                 if (rc == -1)
1386                         errx(EX_IOERR, "user '%s' already exists",
1387                             pwd->pw_name);
1388                 else if (rc != 0)
1389                         err(EX_IOERR, "passwd file update");
1390         }
1391         if (nis && cmdcnf->nispasswd && *cmdcnf->nispasswd == '/') {
1392                 printf("%s\n", cmdcnf->nispasswd);
1393                 rc = addnispwent(cmdcnf->nispasswd, pwd);
1394                 if (rc == -1)
1395                         warnx("User '%s' already exists in NIS passwd",
1396                             pwd->pw_name);
1397                 else if (rc != 0)
1398                         warn("NIS passwd update");
1399                 /* NOTE: we treat NIS-only update errors as non-fatal */
1400         }
1401
1402         if (cmdcnf->groups != NULL) {
1403                 for (i = 0; i < cmdcnf->groups->sl_cur; i++) {
1404                         grp = GETGRNAM(cmdcnf->groups->sl_str[i]);
1405                         /* gr_add doesn't check if new member is already in group */
1406                         if (grp_has_member(grp, pwd->pw_name))
1407                                 continue;
1408                         grp = gr_add(grp, pwd->pw_name);
1409                         /*
1410                          * grp can only be NULL in 2 cases:
1411                          * - the new member is already a member
1412                          * - a problem with memory occurs
1413                          * in both cases we want to skip now.
1414                          */
1415                         if (grp == NULL)
1416                                 continue;
1417                         chggrent(grp->gr_name, grp);
1418                         free(grp);
1419                 }
1420         }
1421
1422         pwd = GETPWNAM(name);
1423         if (pwd == NULL)
1424                 errx(EX_NOUSER, "user '%s' disappeared during update", name);
1425
1426         grp = GETGRGID(pwd->pw_gid);
1427         pw_log(cnf, M_ADD, W_USER, "%s(%ju):%s(%ju):%s:%s:%s",
1428                pwd->pw_name, (uintmax_t)pwd->pw_uid,
1429             grp ? grp->gr_name : "unknown",
1430                (uintmax_t)(grp ? grp->gr_gid : (uid_t)-1),
1431                pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell);
1432
1433         /*
1434          * let's touch and chown the user's mail file. This is not
1435          * strictly necessary under BSD with a 0755 maildir but it also
1436          * doesn't hurt anything to create the empty mailfile
1437          */
1438         if (PWALTDIR() != PWF_ALT) {
1439                 snprintf(path, sizeof(path), "%s/%s", _PATH_MAILDIR,
1440                     pwd->pw_name);
1441                 /* Preserve contents & mtime */
1442                 close(openat(conf.rootfd, path +1, O_RDWR | O_CREAT, 0600));
1443                 fchownat(conf.rootfd, path + 1, pwd->pw_uid, pwd->pw_gid,
1444                     AT_SYMLINK_NOFOLLOW);
1445         }
1446
1447         /*
1448          * Let's create and populate the user's home directory. Note
1449          * that this also `works' for editing users if -m is used, but
1450          * existing files will *not* be overwritten.
1451          */
1452         if (PWALTDIR() != PWF_ALT && createhome && pwd->pw_dir &&
1453             *pwd->pw_dir == '/' && pwd->pw_dir[1])
1454                 create_and_populate_homedir(cmdcnf, pwd, cmdcnf->dotdir,
1455                     cmdcnf->homemode, false);
1456
1457         if (!PWALTDIR() && cmdcnf->newmail && *cmdcnf->newmail &&
1458             (fp = fopen(cnf->newmail, "r")) != NULL) {
1459                 if ((pfp = popen(_PATH_SENDMAIL " -t", "w")) == NULL)
1460                         warn("sendmail");
1461                 else {
1462                         fprintf(pfp, "From: root\n" "To: %s\n"
1463                             "Subject: Welcome!\n\n", pwd->pw_name);
1464                         while (fgets(line, sizeof(line), fp) != NULL) {
1465                                 /* Do substitutions? */
1466                                 fputs(line, pfp);
1467                         }
1468                         pclose(pfp);
1469                         pw_log(cnf, M_ADD, W_USER, "%s(%ju) new user mail sent",
1470                             pwd->pw_name, (uintmax_t)pwd->pw_uid);
1471                 }
1472                 fclose(fp);
1473         }
1474
1475         if (nis && nis_update() == 0)
1476                 pw_log(cnf, M_ADD, W_USER, "NIS maps updated");
1477
1478         return (EXIT_SUCCESS);
1479 }
1480
1481 int
1482 pw_user_mod(int argc, char **argv, char *arg1)
1483 {
1484         struct userconf *cnf;
1485         struct passwd *pwd;
1486         struct group *grp;
1487         StringList *groups = NULL;
1488         char args[] = "C:qn:u:c:d:e:p:g:G:mM:l:k:s:w:L:h:H:NPYy:";
1489         const char *cfg = NULL;
1490         char *gecos, *homedir, *grname, *name, *newname, *walk, *skel, *shell;
1491         char *passwd, *class, *nispasswd;
1492         login_cap_t *lc;
1493         struct stat st;
1494         intmax_t id = -1;
1495         int ch, fd = -1;
1496         size_t i, j;
1497         bool quiet, createhome, pretty, dryrun, nis, edited;
1498         bool precrypted;
1499         mode_t homemode = 0;
1500         time_t expire_time, password_time, now;
1501
1502         expire_time = password_time = -1;
1503         gecos = homedir = grname = name = newname = skel = shell =NULL;
1504         passwd = NULL;
1505         class = nispasswd = NULL;
1506         quiet = createhome = pretty = dryrun = nis = precrypted = false;
1507         edited = false;
1508         now = time(NULL);
1509
1510         if (arg1 != NULL) {
1511                 if (arg1[strspn(arg1, "0123456789")] == '\0')
1512                         id = pw_checkid(arg1, UID_MAX);
1513                 else
1514                         name = arg1;
1515         }
1516
1517         while ((ch = getopt(argc, argv, args)) != -1) {
1518                 switch (ch) {
1519                 case 'C':
1520                         cfg = optarg;
1521                         break;
1522                 case 'q':
1523                         quiet = true;
1524                         break;
1525                 case 'n':
1526                         name = optarg;
1527                         break;
1528                 case 'u':
1529                         id = pw_checkid(optarg, UID_MAX);
1530                         break;
1531                 case 'c':
1532                         gecos = pw_checkname(optarg, 1);
1533                         break;
1534                 case 'd':
1535                         homedir = optarg;
1536                         break;
1537                 case 'e':
1538                         expire_time = parse_date(now, optarg);
1539                         break;
1540                 case 'p':
1541                         password_time = 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                 default:
1607                         exit(EX_USAGE);
1608                 }
1609         }
1610
1611         if (geteuid() != 0 && ! dryrun)
1612                 errx(EX_NOPERM, "you must be root");
1613
1614         if (quiet)
1615                 freopen(_PATH_DEVNULL, "w", stderr);
1616
1617         cnf = get_userconfig(cfg);
1618
1619         if (id < 0 && name == NULL)
1620                 errx(EX_DATAERR, "username or id required");
1621
1622         pwd = (name != NULL) ? GETPWNAM(pw_checkname(name, 0)) : GETPWUID(id);
1623         if (pwd == NULL) {
1624                 if (name == NULL)
1625                         errx(EX_NOUSER, "no such uid `%ju'",
1626                             (uintmax_t) id);
1627                 errx(EX_NOUSER, "no such user `%s'", name);
1628         }
1629
1630         if (name == NULL)
1631                 name = pwd->pw_name;
1632
1633         if (nis && nispasswd == NULL)
1634                 nispasswd = cnf->nispasswd;
1635
1636         if (PWF._altdir == PWF_REGULAR &&
1637             ((pwd->pw_fields & _PWF_SOURCE) != _PWF_FILES)) {
1638                 if ((pwd->pw_fields & _PWF_SOURCE) == _PWF_NIS) {
1639                         if (!nis && nispasswd && *nispasswd != '/')
1640                                 errx(EX_NOUSER, "Cannot modify NIS user `%s'",
1641                                     name);
1642                 } else {
1643                         errx(EX_NOUSER, "Cannot modify non local user `%s'",
1644                             name);
1645                 }
1646         }
1647
1648         if (newname) {
1649                 if (strcmp(pwd->pw_name, "root") == 0)
1650                         errx(EX_DATAERR, "can't rename `root' account");
1651                 if (strcmp(pwd->pw_name, newname) != 0) {
1652                         pwd->pw_name = pw_checkname(newname, 0);
1653                         edited = true;
1654                 }
1655         }
1656
1657         if (id >= 0 && pwd->pw_uid != id) {
1658                 pwd->pw_uid = id;
1659                 edited = true;
1660                 if (pwd->pw_uid != 0 && strcmp(pwd->pw_name, "root") == 0)
1661                         errx(EX_DATAERR, "can't change uid of `root' account");
1662                 if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0)
1663                         warnx("WARNING: account `%s' will have a uid of 0 "
1664                             "(superuser access!)", pwd->pw_name);
1665         }
1666
1667         if (grname && pwd->pw_uid != 0) {
1668                 grp = GETGRNAM(grname);
1669                 if (grp == NULL)
1670                         grp = GETGRGID(pw_checkid(grname, GID_MAX));
1671                 if (grp->gr_gid != pwd->pw_gid) {
1672                         pwd->pw_gid = grp->gr_gid;
1673                         edited = true;
1674                 }
1675         }
1676
1677
1678         if (password_time >= 0 && pwd->pw_change != password_time) {
1679                 pwd->pw_change = password_time;
1680                 edited = true;
1681         }
1682
1683         if (expire_time >= 0 && pwd->pw_expire != expire_time) {
1684                 pwd->pw_expire = expire_time;
1685                 edited = true;
1686         }
1687
1688         if (shell) {
1689                 shell = shell_path(cnf->shelldir, cnf->shells, shell);
1690                 if (shell == NULL)
1691                         shell = "";
1692                 if (strcmp(shell, pwd->pw_shell) != 0) {
1693                         pwd->pw_shell = shell;
1694                         edited = true;
1695                 }
1696         }
1697
1698         if (class && strcmp(pwd->pw_class, class) != 0) {
1699                 pwd->pw_class = class;
1700                 edited = true;
1701         }
1702
1703         if (homedir && strcmp(pwd->pw_dir, homedir) != 0) {
1704                 pwd->pw_dir = homedir;
1705                 edited = true;
1706                 if (fstatat(conf.rootfd, pwd->pw_dir, &st, 0) == -1) {
1707                         if (!createhome)
1708                                 warnx("WARNING: home `%s' does not exist",
1709                                     pwd->pw_dir);
1710                 } else if (!S_ISDIR(st.st_mode)) {
1711                         warnx("WARNING: home `%s' is not a directory",
1712                             pwd->pw_dir);
1713                 }
1714         }
1715
1716         if (passwd && conf.fd == -1) {
1717                 lc = login_getpwclass(pwd);
1718                 if (lc == NULL || login_setcryptfmt(lc, "sha512", NULL) == NULL)
1719                         warn("setting crypt(3) format");
1720                 login_close(lc);
1721                 cnf->default_password = passwd_val(passwd,
1722                     cnf->default_password);
1723                 pwd->pw_passwd = pw_password(cnf, pwd->pw_name);
1724                 edited = true;
1725         }
1726
1727         if (gecos && strcmp(pwd->pw_gecos, gecos) != 0) {
1728                 pwd->pw_gecos = gecos;
1729                 edited = true;
1730         }
1731
1732         if (fd != -1)
1733                 edited = pw_set_passwd(pwd, fd, precrypted, true);
1734
1735         if (dryrun)
1736                 return (print_user(pwd, pretty, false));
1737
1738         if (edited) /* Only updated this if required */
1739                 perform_chgpwent(name, pwd, nis ? nispasswd : NULL);
1740         /* Now perform the needed changes concern groups */
1741         if (groups != NULL) {
1742                 /* Delete User from groups using old name */
1743                 SETGRENT();
1744                 while ((grp = GETGRENT()) != NULL) {
1745                         if (grp->gr_mem == NULL)
1746                                 continue;
1747                         for (i = 0; grp->gr_mem[i] != NULL; i++) {
1748                                 if (strcmp(grp->gr_mem[i] , name) != 0)
1749                                         continue;
1750                                 for (j = i; grp->gr_mem[j] != NULL ; j++)
1751                                         grp->gr_mem[j] = grp->gr_mem[j+1];
1752                                 chggrent(grp->gr_name, grp);
1753                                 break;
1754                         }
1755                 }
1756                 ENDGRENT();
1757                 /* Add the user to the needed groups */
1758                 for (i = 0; i < groups->sl_cur; i++) {
1759                         grp = GETGRNAM(groups->sl_str[i]);
1760                         grp = gr_add(grp, pwd->pw_name);
1761                         if (grp == NULL)
1762                                 continue;
1763                         chggrent(grp->gr_name, grp);
1764                         free(grp);
1765                 }
1766         }
1767         /* In case of rename we need to walk over the different groups */
1768         if (newname) {
1769                 SETGRENT();
1770                 while ((grp = GETGRENT()) != NULL) {
1771                         if (grp->gr_mem == NULL)
1772                                 continue;
1773                         for (i = 0; grp->gr_mem[i] != NULL; i++) {
1774                                 if (strcmp(grp->gr_mem[i], name) != 0)
1775                                         continue;
1776                                 grp->gr_mem[i] = newname;
1777                                 chggrent(grp->gr_name, grp);
1778                                 break;
1779                         }
1780                 }
1781         }
1782
1783         /* go get a current version of pwd */
1784         if (newname)
1785                 name = newname;
1786         pwd = GETPWNAM(name);
1787         if (pwd == NULL)
1788                 errx(EX_NOUSER, "user '%s' disappeared during update", name);
1789         grp = GETGRGID(pwd->pw_gid);
1790         pw_log(cnf, M_UPDATE, W_USER, "%s(%ju):%s(%ju):%s:%s:%s",
1791             pwd->pw_name, (uintmax_t)pwd->pw_uid,
1792             grp ? grp->gr_name : "unknown",
1793             (uintmax_t)(grp ? grp->gr_gid : (uid_t)-1),
1794             pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell);
1795
1796         /*
1797          * Let's create and populate the user's home directory. Note
1798          * that this also `works' for editing users if -m is used, but
1799          * existing files will *not* be overwritten.
1800          */
1801         if (PWALTDIR() != PWF_ALT && createhome && pwd->pw_dir &&
1802             *pwd->pw_dir == '/' && pwd->pw_dir[1]) {
1803                 if (!skel)
1804                         skel = cnf->dotdir;
1805                 if (homemode == 0)
1806                         homemode = cnf->homemode;
1807                 create_and_populate_homedir(cnf, pwd, skel, homemode, true);
1808         }
1809
1810         if (nis && nis_update() == 0)
1811                 pw_log(cnf, M_UPDATE, W_USER, "NIS maps updated");
1812
1813         return (EXIT_SUCCESS);
1814 }