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