pwd_mkdb.tproj/pwd_mkdb.c

   1 /*      $OpenBSD: pwd_mkdb.c,v 1.36 2003/06/08 21:14:55 millert Exp $   */
   2
   3 /*-
   4  * Copyright (c) 1991, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  * Portions Copyright (c) 1994, Jason Downs.  All rights reserved.
   7  * Portions Copyright (c) 1998, Todd C. Miller.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <sys/cdefs.h>
  35 #ifndef lint
  36 __unused static const char copyright[] =
  37 "@(#) Copyright (c) 1991, 1993, 1994\n\
  38         The Regents of the University of California.  All rights reserved.\n";
  39 #endif /* not lint */
  40
  41 #ifndef lint
  42 #if 0
  43 static const char sccsid[] = "from: @(#)pwd_mkdb.c      8.5 (Berkeley) 4/20/94";
  44 #else
  45 __unused static const char rcsid[] = "$OpenBSD: pwd_mkdb.c,v 1.36 2003/06/08 21:14:55 millert Exp $";
  46 #endif
  47 #endif /* not lint */
  48
  49 #include <sys/param.h>
  50 #include <sys/stat.h>
  51
  52 #include <db.h>
  53 #include <err.h>
  54 #include <errno.h>
  55 #include <fcntl.h>
  56 #include <grp.h>
  57 #include <limits.h>
  58 #include <pwd.h>
  59 #include <signal.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <string.h>
  63 #include <unistd.h>
  64 #include <util.h>
  65 #include <sys/param.h>
  66 #include "pw_scan.h"
  67
  68 #define INSECURE        1
  69 #define SECURE          2
  70 #define PERM_INSECURE   (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)
  71 #define PERM_SECURE     (S_IRUSR|S_IWUSR)
  72
  73 #define FILE_SECURE     0x01
  74 #define FILE_INSECURE   0x02
  75 #define FILE_ORIG       0x04
  76
  77 #define SHADOW_GROUP    "wheel"
  78
  79 HASHINFO openinfo = {
  80         .bsize = 4096,
  81         .ffactor = 32,
  82         .nelem = 256,
  83         .cachesize = 2048 * 1024,
  84         .hash = NULL,
  85         .lorder = 0
  86 };
  87
  88 static char *pname;                             /* password file name */
  89 static char *basedir;                           /* dir holding master.passwd */
  90 static int clean;                               /* what to remove on cleanup */
  91 static int hasyp;                               /* are we running YP? */
  92
  93 void    cleanup(void);
  94 void    error(char *);
  95 void    errorx(char *);
  96 void    cp(char *, char *, mode_t);
  97 void    mv(char *, char *);
  98 int     scan(FILE *, struct passwd *, int *);
  99 void    usage(void);
 100 char    *changedir(char *path, char *dir);
 101 void    db_store(FILE *, FILE *, DB *, DB *,struct passwd *, int, char *, uid_t);
 102
 103 int
 104 main(int argc, char **argv)
 105 {
 106         DB *dp, *edp;
 107         DBT data, key;
 108         FILE *fp, *oldfp = NULL;
 109         struct stat st;
 110         struct passwd pwd;
 111         struct group *grp;
 112         sigset_t set;
 113         uid_t olduid = UID_MAX;
 114         gid_t shadow;
 115         int ch, tfd, makeold, secureonly, flags, checkonly;
 116         char *username, buf[MAX(MAXPATHLEN, LINE_MAX * 2)];
 117
 118         flags = checkonly = makeold = secureonly = 0;
 119         username = NULL;
 120         while ((ch = getopt(argc, argv, "cd:psu:v")) != -1)
 121                 switch (ch) {
 122                 case 'c':                       /* verify only */
 123                         checkonly = 1;
 124                         break;
 125                 case 'd':
 126                         basedir = optarg;
 127                         if (strlen(basedir) > MAXPATHLEN - 40)
 128                                 errx(1, "basedir too long");
 129                         break;
 130                 case 'p':                       /* create V7 "file.orig" */
 131                         makeold = 1;
 132                         break;
 133                 case 's':                       /* only update spwd.db */
 134                         secureonly = 1;
 135                         break;
 136                 case 'u':                       /* only update this record */
 137                         username = optarg;
 138                         if (strlen(username) > _PW_NAME_LEN)
 139                                 errx(1, "username too long");
 140                         break;
 141                 case 'v':                       /* backward compatible */
 142                         break;
 143                 case '?':
 144                 default:
 145                         usage();
 146                 }
 147         argc -= optind;
 148         argv += optind;
 149
 150         if (argc != 1 || (makeold && secureonly) ||
 151             (username && (*username == '+' || *username == '-')))
 152                 usage();
 153
 154         if ((grp = getgrnam(SHADOW_GROUP)) == NULL)
 155                 errx(1, "cannot find `%s' in the group database, aborting",
 156                     SHADOW_GROUP);
 157         shadow = grp->gr_gid;
 158
 159         /*
 160          * This could be changed to allow the user to interrupt.
 161          * Probably not worth the effort.
 162          */
 163         sigemptyset(&set);
 164         sigaddset(&set, SIGTSTP);
 165         sigaddset(&set, SIGHUP);
 166         sigaddset(&set, SIGINT);
 167         sigaddset(&set, SIGQUIT);
 168         sigaddset(&set, SIGTERM);
 169         (void)sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL);
 170
 171         /* We don't care what the user wants. */
 172         (void)umask(0);
 173
 174         if (**argv != '/' && basedir == NULL)
 175                 errx(1, "%s must be specified as an absolute path", *argv);
 176
 177         if ((pname = strdup(changedir(*argv, basedir))) == NULL)
 178                 err(1, NULL);
 179         /* Open the original password file */
 180         if (!(fp = fopen(pname, "r")))
 181                 error(pname);
 182
 183         /* Check only if password database is valid */
 184         if (checkonly) {
 185                 u_int cnt;
 186
 187                 for (cnt = 1; scan(fp, &pwd, &flags); ++cnt)
 188                         ;
 189                 exit(0);
 190         }
 191
 192         if (fstat(fileno(fp), &st) == -1)
 193                 error(pname);
 194
 195         /* Tweak openinfo values for large passwd files. */
 196         if (st.st_size > (off_t)100*1024)
 197                 openinfo.cachesize = (u_int)MIN(st.st_size * 20, (off_t)12*1024*1024);
 198         if (st.st_size / 128 > openinfo.nelem)
 199                 openinfo.nelem = (u_int)(st.st_size / 128);
 200
 201         /* If only updating a single record, stash the old uid */
 202         if (username) {
 203                 dp = dbopen(_PATH_MP_DB, O_RDONLY, 0, DB_HASH, NULL);
 204                 if (dp == NULL)
 205                         error(_PATH_MP_DB);
 206                 buf[0] = _PW_KEYBYNAME;
 207                 strlcpy(buf + 1, username, sizeof(buf) - 1);
 208                 key.data = (u_char *)buf;
 209                 key.size = strlen(buf + 1) + 1;
 210                 if ((dp->get)(dp, &key, &data, 0) == 0) {
 211                         char *p = (char *)data.data;
 212                         /* Skip to uid field */
 213                         while (*p++ != '\0')
 214                                 ;
 215                         while (*p++ != '\0')
 216                                 ;
 217                         memcpy(&olduid, p, sizeof(olduid));
 218                 } else
 219                         olduid = UID_MAX;
 220                 (dp->close)(dp);
 221         }
 222
 223         /* Open the temporary encrypted password database. */
 224         (void)snprintf(buf, sizeof(buf), "%s.tmp",
 225             changedir(_PATH_SMP_DB, basedir));
 226         if (username) {
 227                 cp(changedir(_PATH_SMP_DB, basedir), buf, PERM_SECURE);
 228                 edp = dbopen(buf,
 229                     O_RDWR, PERM_SECURE, DB_HASH, &openinfo);
 230         } else {
 231                 edp = dbopen(buf,
 232                     O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo);
 233         }
 234         if (!edp)
 235                 error(buf);
 236         if (fchown(edp->fd(edp), (uid_t)-1, shadow) != 0)
 237                 warn("%s: unable to set group to %s", _PATH_SMP_DB,
 238                     SHADOW_GROUP);
 239         else if (fchmod(edp->fd(edp), PERM_SECURE|S_IRGRP) != 0)
 240                 warn("%s: unable to make group readable", _PATH_SMP_DB);
 241         clean |= FILE_SECURE;
 242
 243         /* Open the temporary insecure password database. */
 244         if (!secureonly) {
 245                 (void)snprintf(buf, sizeof(buf), "%s.tmp",
 246                     changedir(_PATH_MP_DB, basedir));
 247                 if (username) {
 248                         cp(changedir(_PATH_MP_DB, basedir), buf, PERM_INSECURE);
 249                         dp = dbopen(buf, O_RDWR, PERM_INSECURE, DB_HASH,
 250                             &openinfo);
 251                 } else {
 252                         dp = dbopen(buf, O_RDWR|O_CREAT|O_EXCL, PERM_INSECURE,
 253                             DB_HASH, &openinfo);
 254                 }
 255                 if (dp == NULL)
 256                         error(buf);
 257                 clean |= FILE_INSECURE;
 258         } else
 259                 dp = NULL;
 260
 261         /*
 262          * Open file for old password file.  Minor trickiness -- don't want to
 263          * chance the file already existing, since someone (stupidly) might
 264          * still be using this for permission checking.  So, open it first and
 265          * fdopen the resulting fd.  The resulting file should be readable by
 266          * everyone.
 267          */
 268         if (makeold) {
 269                 (void)snprintf(buf, sizeof(buf), "%s.orig", pname);
 270                 if ((tfd = open(buf,
 271                     O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0)
 272                         error(buf);
 273                 if ((oldfp = fdopen(tfd, "w")) == NULL)
 274                         error(buf);
 275                 clean |= FILE_ORIG;
 276         }
 277
 278         /*
 279          * The databases actually contain three copies of the original data.
 280          * Each password file entry is converted into a rough approximation
 281          * of a ``struct passwd'', with the strings placed inline.  This
 282          * object is then stored as the data for three separate keys.  The
 283          * first key * is the pw_name field prepended by the _PW_KEYBYNAME
 284          * character.  The second key is the pw_uid field prepended by the
 285          * _PW_KEYBYUID character.  The third key is the line number in the
 286          * original file prepended by the _PW_KEYBYNUM character.  (The special
 287          * characters are prepended to ensure that the keys do not collide.)
 288          *
 289          * If we see something go by that looks like YP, we save a special
 290          * pointer record, which if YP is enabled in the C lib, will speed
 291          * things up.
 292          */
 293
 294         /*
 295          * Write the .db files.
 296          * We do this three times, one per key type (for getpw{nam,uid,ent}).
 297          * The first time through we also check for YP, issue warnings
 298          * and save the V7 format passwd file if necessary.
 299          */
 300         db_store(fp, oldfp, edp, dp, &pwd, _PW_KEYBYNAME, username, olduid);
 301         db_store(fp, oldfp, edp, dp, &pwd, _PW_KEYBYUID, username, olduid);
 302         db_store(fp, oldfp, edp, dp, &pwd, _PW_KEYBYNUM, username, olduid);
 303
 304         /* Store YP token, if needed. */
 305         if (hasyp && !username) {
 306                 key.data = (u_char *)_PW_YPTOKEN;
 307                 key.size = strlen(_PW_YPTOKEN);
 308                 data.data = (u_char *)NULL;
 309                 data.size = 0;
 310
 311                 if ((edp->put)(edp, &key, &data, R_NOOVERWRITE) == -1)
 312                         error("put");
 313
 314                 if (dp && (dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1)
 315                         error("put");
 316         }
 317
 318         if ((edp->close)(edp))
 319                 error("close edp");
 320         if (dp && (dp->close)(dp))
 321                 error("close dp");
 322         if (makeold) {
 323                 if (fclose(oldfp) == EOF)
 324                         error("close old");
 325         }
 326
 327         /* Set master.passwd permissions, in case caller forgot. */
 328         (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR);
 329         if (fclose(fp) != 0)
 330                 error("fclose");
 331
 332         /* Install as the real password files. */
 333         if (!secureonly) {
 334                 (void)snprintf(buf, sizeof(buf), "%s.tmp",
 335                     changedir(_PATH_MP_DB, basedir));
 336                 mv(buf, changedir(_PATH_MP_DB, basedir));
 337         }
 338         (void)snprintf(buf, sizeof(buf), "%s.tmp",
 339             changedir(_PATH_SMP_DB, basedir));
 340         mv(buf, changedir(_PATH_SMP_DB, basedir));
 341         if (makeold) {
 342                 (void)snprintf(buf, sizeof(buf), "%s.orig", pname);
 343                 mv(buf, changedir(_PATH_PASSWD, basedir));
 344         }
 345
 346         /*
 347          * Move the master password LAST -- chpass(1), passwd(1) and vipw(8)
 348          * all use flock(2) on it to block other incarnations of themselves.
 349          * The rename means that everything is unlocked, as the original file
 350          * can no longer be accessed.
 351          */
 352         mv(pname, changedir(_PATH_MASTERPASSWD, basedir));
 353         exit(0);
 354 }
 355
 356 int
 357 scan(FILE *fp, struct passwd *pw, int *flags)
 358 {
 359         static int lcnt;
 360         static char line[LINE_MAX];
 361         char *p;
 362
 363         if (fgets(line, sizeof(line), fp) == NULL)
 364                 return (0);
 365         ++lcnt;
 366         /*
 367          * ``... if I swallow anything evil, put your fingers down my
 368          * throat...''
 369          *      -- The Who
 370          */
 371         p = line;
 372         if (*p != '\0' && *(p += strlen(line) - 1) != '\n') {
 373                 warnx("line too long");
 374                 goto fmt;
 375         }
 376         *p = '\0';
 377         *flags = 0;
 378         if (!pw_scan(line, pw, flags)) {
 379                 warnx("at line #%d", lcnt);
 380 fmt:            errno = EFTYPE; /* XXX */
 381                 error(pname);
 382         }
 383
 384         return (1);
 385 }
 386
 387 void
 388 cp(char *from, char *to, mode_t mode)
 389 {
 390         static char buf[MAXBSIZE];
 391         int from_fd, to_fd;
 392         ssize_t rcount, wcount;
 393
 394         if ((from_fd = open(from, O_RDONLY, 0)) < 0)
 395                 error(from);
 396         if ((to_fd = open(to, O_WRONLY|O_CREAT|O_EXCL, mode)) < 0)
 397                 error(to);
 398         while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
 399                 wcount = write(to_fd, buf, rcount);
 400                 if (rcount != wcount || wcount == -1) {
 401                         int sverrno = errno;
 402
 403                         (void)snprintf(buf, sizeof(buf), "%s to %s", from, to);
 404                         errno = sverrno;
 405                         error(buf);
 406                 }
 407         }
 408         if (rcount < 0) {
 409                 int sverrno = errno;
 410
 411                 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to);
 412                 errno = sverrno;
 413                 error(buf);
 414         }
 415 }
 416
 417 void
 418 mv(char *from, char *to)
 419 {
 420         char buf[MAXPATHLEN * 2];
 421
 422         if (rename(from, to)) {
 423                 int sverrno = errno;
 424
 425                 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to);
 426                 errno = sverrno;
 427                 error(buf);
 428         }
 429 }
 430
 431 void
 432 error(char *name)
 433 {
 434         warn("%s", name);
 435         cleanup();
 436         exit(1);
 437 }
 438
 439 void
 440 errorx(char *name)
 441 {
 442         warnx("%s", name);
 443         cleanup();
 444         exit(1);
 445 }
 446
 447 void
 448 cleanup(void)
 449 {
 450         char buf[MAXPATHLEN];
 451
 452         if (clean & FILE_ORIG) {
 453                 (void)snprintf(buf, sizeof(buf), "%s.orig", pname);
 454                 (void)unlink(buf);
 455         }
 456         if (clean & FILE_SECURE) {
 457                 (void)snprintf(buf, sizeof(buf), "%s.tmp",
 458                     changedir(_PATH_SMP_DB, basedir));
 459                 (void)unlink(buf);
 460         }
 461         if (clean & FILE_INSECURE) {
 462                 (void)snprintf(buf, sizeof(buf), "%s.tmp",
 463                     changedir(_PATH_MP_DB, basedir));
 464                 (void)unlink(buf);
 465         }
 466 }
 467
 468 void
 469 usage(void)
 470 {
 471         (void)fprintf(stderr,
 472             "usage: pwd_mkdb [-c] [-p | -s] [-d basedir] [-u username] file\n");
 473         exit(1);
 474 }
 475
 476 char *
 477 changedir(char *path, char *dir)
 478 {
 479         static char fixed[MAXPATHLEN];
 480         char *p;
 481
 482         if (!dir)
 483                 return (path);
 484
 485         if ((p = strrchr(path, '/')) != NULL)
 486                 path = p + 1;
 487         snprintf(fixed, sizeof(fixed), "%s/%s", dir, path);
 488         return (fixed);
 489 }
 490
 491 void
 492 db_store(FILE *fp, FILE *oldfp, DB *edp, DB *dp, struct passwd *pw,
 493          int keytype, char *username, uid_t olduid)
 494 {
 495         int flags = 0;
 496         int dbmode, found = 0;
 497         u_int cnt;
 498         char *p, *t, buf[LINE_MAX * 2], tbuf[1024];
 499         DBT data, key;
 500         size_t len;
 501         static int firsttime = 1;
 502
 503         /* If given a username just add that record to the existing db. */
 504         dbmode = username ? 0 : R_NOOVERWRITE;
 505
 506         rewind(fp);
 507         data.data = (u_char *)buf;
 508         key.data = (u_char *)tbuf;
 509         for (cnt = 1; scan(fp, pw, &flags); ++cnt) {
 510
 511 #ifdef __APPLE__
 512                 if (pw->pw_name == NULL)
 513                         continue;
 514 #endif
 515
 516                 if (firsttime) {
 517                         /* Look like YP? */
 518                         if ((pw->pw_name[0] == '+') || (pw->pw_name[0] == '-'))
 519                                 hasyp++;
 520
 521                         /* Warn about potentially unsafe uid/gid overrides. */
 522                         if (pw->pw_name[0] == '+') {
 523                                 if (!(flags & _PASSWORD_NOUID) && !pw->pw_uid)
 524                                         warnx("line %d: superuser override in "
 525                                             "YP inclusion", cnt);
 526                                 if (!(flags & _PASSWORD_NOGID) && !pw->pw_gid)
 527                                         warnx("line %d: wheel override in "
 528                                             "YP inclusion", cnt);
 529                         }
 530
 531                         /* Create V7 format password file entry. */
 532                         if (oldfp != NULL)
 533                                 if (fprintf(oldfp, "%s:*:%u:%u:%s:%s:%s\n",
 534                                     pw->pw_name, pw->pw_uid, pw->pw_gid,
 535                                     pw->pw_gecos, pw->pw_dir, pw->pw_shell)
 536                                     == EOF)
 537                                         error("write old");
 538                 }
 539
 540                 /* Are we updating a specific record? */
 541                 if (username) {
 542                         if (strcmp(username, pw->pw_name) != 0)
 543                                 continue;
 544                         found = 1;
 545                         /* If the uid changed, remove the old record by uid. */
 546                         if (olduid != UID_MAX && olduid != pw->pw_uid) {
 547                                 tbuf[0] = _PW_KEYBYUID;
 548                                 memcpy(tbuf + 1, &olduid, sizeof(olduid));
 549                                 key.size = sizeof(olduid) + 1;
 550                                 (edp->del)(edp, &key, 0);
 551                                 if (dp)
 552                                         (dp->del)(dp, &key, 0);
 553                         }
 554                         /* XXX - should check to see if line number changed. */
 555                 }
 556
 557                 /* Build the key. */
 558                 tbuf[0] = keytype;
 559                 switch (keytype) {
 560                 case _PW_KEYBYNUM:
 561                         memmove(tbuf + 1, &cnt, sizeof(cnt));
 562                         key.size = sizeof(cnt) + 1;
 563                         break;
 564
 565                 case _PW_KEYBYNAME:
 566                         len = strlen(pw->pw_name);
 567                         memmove(tbuf + 1, pw->pw_name, len);
 568                         key.size = len + 1;
 569                         break;
 570
 571                 case _PW_KEYBYUID:
 572                         memmove(tbuf + 1, &pw->pw_uid, sizeof(pw->pw_uid));
 573                         key.size = sizeof(pw->pw_uid) + 1;
 574                         break;
 575                 }
 576
 577 #define COMPACT(e)      t = e; while ((*p++ = *t++));
 578                 /* Create the secure record. */
 579                 p = buf;
 580                 COMPACT(pw->pw_name);
 581                 COMPACT(pw->pw_passwd);
 582                 memmove(p, &pw->pw_uid, sizeof(uid_t));
 583                 p += sizeof(uid_t);
 584                 memmove(p, &pw->pw_gid, sizeof(gid_t));
 585                 p += sizeof(gid_t);
 586                 memmove(p, &pw->pw_change, sizeof(time_t));
 587                 p += sizeof(time_t);
 588                 COMPACT(pw->pw_class);
 589                 COMPACT(pw->pw_gecos);
 590                 COMPACT(pw->pw_dir);
 591                 COMPACT(pw->pw_shell);
 592                 memmove(p, &pw->pw_expire, sizeof(time_t));
 593                 p += sizeof(time_t);
 594                 memmove(p, &flags, sizeof(int));
 595                 p += sizeof(int);
 596                 data.size = p - buf;
 597
 598                 /* Write the secure record. */
 599                 if ((edp->put)(edp, &key, &data, dbmode) == -1)
 600                         error("put");
 601
 602                 if (dp == NULL)
 603                         continue;
 604
 605                 /* Star out password to make insecure record. */
 606                 p = buf + strlen(pw->pw_name) + 1;      /* skip pw_name */
 607                 len = strlen(pw->pw_passwd);
 608                 memset(p, 0, len);                      /* zero pw_passwd */
 609                 t = p + len + 1;                        /* skip pw_passwd */
 610                 if (len != 0)
 611                         *p++ = '*';
 612                 *p++ = '\0';
 613                 memmove(p, t, data.size - (t - buf));
 614                 data.size -= len - 1;
 615
 616                 /* Write the insecure record. */
 617                 if ((dp->put)(dp, &key, &data, dbmode) == -1)
 618                         error("put");
 619         }
 620         if (firsttime) {
 621                 firsttime = 0;
 622                 if (username && !found && olduid != UID_MAX)
 623                         errorx("can't find user in master.passwd");
 624         }
 625 }