usr.sbin/pwd_mkdb/pwd_mkdb.c

   1 /*-
   2  * Copyright (c) 1991, 1993, 1994
   3  *      The Regents of the University of California.  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  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1991, 1993, 1994 The Regents of the University of California.  All rights reserved.
  30  * @(#)pwd_mkdb.c       8.5 (Berkeley) 4/20/94
  31  * $FreeBSD: src/usr.sbin/pwd_mkdb/pwd_mkdb.c,v 1.51 2005/06/15 10:13:04 dd Exp $
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/endian.h>
  36 #include <sys/stat.h>
  37 #include <arpa/inet.h>
  38
  39 #include <db.h>
  40 #include <err.h>
  41 #include <errno.h>
  42 #include <fcntl.h>
  43 #include <limits.h>
  44 #include <pwd.h>
  45 #include <signal.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <unistd.h>
  50
  51 #include "pw_scan.h"
  52
  53 #define INSECURE        1
  54 #define SECURE          2
  55 #define PERM_INSECURE   (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)
  56 #define PERM_SECURE     (S_IRUSR|S_IWUSR)
  57 #define LEGACY_VERSION(x)  _PW_VERSIONED(x, 3)
  58 #define CURRENT_VERSION(x) _PW_VERSIONED(x, 4)
  59
  60 HASHINFO openinfo = {
  61         4096,           /* bsize */
  62         32,             /* ffactor */
  63         256,            /* nelem */
  64         2048 * 1024,    /* cachesize */
  65         NULL,           /* hash() */
  66         BYTE_ORDER      /* lorder */
  67 };
  68
  69 static enum state { FILE_INSECURE, FILE_SECURE, FILE_ORIG } clean;
  70 static struct passwd pwd;                       /* password structure */
  71 static char *pname;                             /* password file name */
  72 static char prefix[MAXPATHLEN];
  73
  74 static int is_comment;  /* flag for comments */
  75 static char line[LINE_MAX];
  76
  77 void    cleanup(void);
  78 void    error(const char *) __dead2;
  79 void    cp(char *, char *, mode_t mode);
  80 void    mv(char *, char *);
  81 int     scan(FILE *, struct passwd *);
  82 static void     usage(void);
  83
  84 int
  85 main(int argc, char *argv[])
  86 {
  87         static char verskey[] = _PWD_VERSION_KEY;
  88         char version = _PWD_CURRENT_VERSION;
  89         DB *dp, *sdp, *pw_db;
  90         DBT data, sdata, key;
  91         FILE *fp, *oldfp;
  92         sigset_t set;
  93         int ch, cnt, ypcnt, makeold, tfd, yp_enabled = 0;
  94         unsigned int len;
  95         uint32_t store;
  96         const char *t;
  97         char *p;
  98         char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], tbuf[1024];
  99         char sbuf[MAX(MAXPATHLEN, LINE_MAX * 2)];
 100         char buf2[MAXPATHLEN];
 101         char sbuf2[MAXPATHLEN];
 102         char *username;
 103         u_int method, methoduid;
 104         int Cflag, dflag, iflag;
 105         int nblock = 0;
 106
 107         iflag = dflag = Cflag = 0;
 108         strcpy(prefix, _PATH_PWD);
 109         makeold = 0;
 110         username = NULL;
 111         oldfp = NULL;
 112         while ((ch = getopt(argc, argv, "BCLNd:ips:u:v")) != -1)
 113                 switch(ch) {
 114                 case 'B':                       /* big-endian output */
 115                         openinfo.lorder = BIG_ENDIAN;
 116                         break;
 117                 case 'C':                       /* verify only */
 118                         Cflag = 1;
 119                         break;
 120                 case 'L':                       /* little-endian output */
 121                         openinfo.lorder = LITTLE_ENDIAN;
 122                         break;
 123                 case 'N':                       /* do not wait for lock */
 124                         nblock = LOCK_NB;       /* will fail if locked */
 125                         break;
 126                 case 'd':
 127                         dflag++;
 128                         strlcpy(prefix, optarg, sizeof(prefix));
 129                         break;
 130                 case 'i':
 131                         iflag++;
 132                         break;
 133                 case 'p':                       /* create V7 "file.orig" */
 134                         makeold = 1;
 135                         break;
 136                 case 's':                       /* change default cachesize */
 137                         openinfo.cachesize = atoi(optarg) * 1024 * 1024;
 138                         break;
 139                 case 'u':                       /* only update this record */
 140                         username = optarg;
 141                         break;
 142                 case 'v':                       /* backward compatible */
 143                         break;
 144                 default:
 145                         usage();
 146                 }
 147         argc -= optind;
 148         argv += optind;
 149
 150         if (argc != 1 || (username && (*username == '+' || *username == '-')))
 151                 usage();
 152
 153         /*
 154          * This could be changed to allow the user to interrupt.
 155          * Probably not worth the effort.
 156          */
 157         sigemptyset(&set);
 158         sigaddset(&set, SIGTSTP);
 159         sigaddset(&set, SIGHUP);
 160         sigaddset(&set, SIGINT);
 161         sigaddset(&set, SIGQUIT);
 162         sigaddset(&set, SIGTERM);
 163         sigprocmask(SIG_BLOCK, &set, NULL);
 164
 165         /* We don't care what the user wants. */
 166         umask(0);
 167
 168         pname = *argv;
 169
 170         /*
 171          * Open and lock the original password file.  We have to check
 172          * the hardlink count after we get the lock to handle any potential
 173          * unlink/rename race.
 174          *
 175          * This lock is necessary when someone runs pwd_mkdb manually, directly
 176          * on master.passwd, to handle the case where a user might try to
 177          * change his password while pwd_mkdb is running.
 178          */
 179         for (;;) {
 180                 struct stat st;
 181
 182                 if (!(fp = fopen(pname, "r")))
 183                         error(pname);
 184                 if (flock(fileno(fp), LOCK_EX|nblock) < 0 && !(dflag && iflag))
 185                         error("flock");
 186                 if (fstat(fileno(fp), &st) < 0)
 187                         error(pname);
 188                 if (st.st_nlink != 0)
 189                         break;
 190                 fclose(fp);
 191                 fp = NULL;
 192         }
 193
 194         /* check only if password database is valid */
 195         if (Cflag) {
 196                 for (cnt = 1; scan(fp, &pwd); ++cnt);
 197                 exit(0);
 198         }
 199
 200         /* Open the temporary insecure password database. */
 201         snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB);
 202         snprintf(sbuf, sizeof(sbuf), "%s/%s.tmp", prefix, _SMP_DB);
 203         if (username) {
 204                 int use_version;
 205
 206                 snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB);
 207                 snprintf(sbuf2, sizeof(sbuf2), "%s/%s", prefix, _SMP_DB);
 208
 209                 clean = FILE_INSECURE;
 210                 cp(buf2, buf, PERM_INSECURE);
 211                 dp = dbopen(buf,
 212                     O_RDWR|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo);
 213                 if (dp == NULL)
 214                         error(buf);
 215
 216                 clean = FILE_SECURE;
 217                 cp(sbuf2, sbuf, PERM_SECURE);
 218                 sdp = dbopen(sbuf,
 219                     O_RDWR|O_EXCL, PERM_SECURE, DB_HASH, &openinfo);
 220                 if (sdp == NULL)
 221                         error(sbuf);
 222
 223                 /*
 224                  * Do some trouble to check if we should store this users
 225                  * uid. Don't use getpwnam/getpwuid as that interferes
 226                  * with NIS.
 227                  */
 228                 pw_db = dbopen(_PATH_MP_DB, O_RDONLY, 0, DB_HASH, NULL);
 229                 if (!pw_db)
 230                         error(_MP_DB);
 231
 232                 key.data = verskey;
 233                 key.size = sizeof(verskey)-1;
 234                 if ((pw_db->get)(pw_db, &key, &data, 0) == 0)
 235                         use_version = *(unsigned char *)data.data;
 236                 else
 237                         use_version = 3;
 238                 buf[0] = _PW_VERSIONED(_PW_KEYBYNAME, use_version);
 239                 len = strlen(username);
 240
 241                 /* Only check that username fits in buffer */
 242                 memmove(buf + 1, username, MIN(len, sizeof(buf) - 1));
 243                 key.data = (u_char *)buf;
 244                 key.size = len + 1;
 245                 if ((pw_db->get)(pw_db, &key, &data, 0) == 0) {
 246                         p = (char *)data.data;
 247
 248                         /* jump over pw_name and pw_passwd, to get to pw_uid */
 249                         while (*p++)
 250                                 ;
 251                         while (*p++)
 252                                 ;
 253
 254                         buf[0] = _PW_VERSIONED(_PW_KEYBYUID, use_version);
 255                         memmove(buf + 1, p, sizeof(store));
 256                         key.data = (u_char *)buf;
 257                         key.size = sizeof(store) + 1;
 258
 259                         if ((pw_db->get)(pw_db, &key, &data, 0) == 0) {
 260                                 /* First field of data.data holds pw_pwname */
 261                                 if (!strcmp(data.data, username))
 262                                         methoduid = 0;
 263                                 else
 264                                         methoduid = R_NOOVERWRITE;
 265                         } else {
 266                                 methoduid = R_NOOVERWRITE;
 267                         }
 268                 } else {
 269                         methoduid = R_NOOVERWRITE;
 270                 }
 271                 if ((pw_db->close)(pw_db))
 272                         error("close pw_db");
 273                 method = 0;
 274         } else {
 275                 dp = dbopen(buf,
 276                     O_RDWR|O_CREAT|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo);
 277                 if (dp == NULL)
 278                         error(buf);
 279                 clean = FILE_INSECURE;
 280
 281                 sdp = dbopen(sbuf,
 282                     O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo);
 283                 if (sdp == NULL)
 284                         error(sbuf);
 285                 clean = FILE_SECURE;
 286
 287                 method = R_NOOVERWRITE;
 288                 methoduid = R_NOOVERWRITE;
 289         }
 290
 291         /*
 292          * Open file for old password file.  Minor trickiness -- don't want to
 293          * chance the file already existing, since someone (stupidly) might
 294          * still be using this for permission checking.  So, open it first and
 295          * fdopen the resulting fd.  The resulting file should be readable by
 296          * everyone.
 297          */
 298         if (makeold) {
 299                 snprintf(buf, sizeof(buf), "%s.orig", pname);
 300                 if ((tfd = open(buf,
 301                     O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0)
 302                         error(buf);
 303                 if ((oldfp = fdopen(tfd, "w")) == NULL)
 304                         error(buf);
 305                 clean = FILE_ORIG;
 306         }
 307
 308         /*
 309          * The databases actually contain three copies of the original data.
 310          * Each password file entry is converted into a rough approximation
 311          * of a ``struct passwd'', with the strings placed inline.  This
 312          * object is then stored as the data for three separate keys.  The
 313          * first key * is the pw_name field prepended by the _PW_KEYBYNAME
 314          * character.  The second key is the pw_uid field prepended by the
 315          * _PW_KEYBYUID character.  The third key is the line number in the
 316          * original file prepended by the _PW_KEYBYNUM character.  (The special
 317          * characters are prepended to ensure that the keys do not collide.)
 318          */
 319         /* In order to transition this file into a machine-independent
 320          * form, we have to change the format of entries.  However, since
 321          * older binaries will still expect the old MD format entries, we
 322          * create those as usual and use versioned tags for the new entries.
 323          */
 324         if (username == NULL) {
 325                 /* Do not add the VERSION tag when updating a single
 326                  * user.  When operating on `old format' databases, this
 327                  * would result in applications `seeing' only the updated
 328                  * entries.
 329                  */
 330                 key.data = verskey;
 331                 key.size = sizeof(verskey)-1;
 332                 data.data = &version;
 333                 data.size = 1;
 334                 if ((dp->put)(dp, &key, &data, 0) == -1)
 335                         error("put");
 336                 if ((dp->put)(sdp, &key, &data, 0) == -1)
 337                         error("put");
 338         }
 339         ypcnt = 1;
 340         data.data = (u_char *)buf;
 341         sdata.data = (u_char *)sbuf;
 342         key.data = (u_char *)tbuf;
 343         for (cnt = 1; scan(fp, &pwd); ++cnt) {
 344                 if (!is_comment &&
 345                     (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-'))
 346                         yp_enabled = 1;
 347                 if (is_comment)
 348                         --cnt;
 349 #define COMPACT(e)      t = e; while ((*p++ = *t++));
 350 #define SCALAR(e)       store = htonl((uint32_t)(e));      \
 351                         memmove(p, &store, sizeof(store)); \
 352                         p += sizeof(store);
 353 #define LSCALAR(e)      store = HTOL((uint32_t)(e));       \
 354                         memmove(p, &store, sizeof(store)); \
 355                         p += sizeof(store);
 356 #define HTOL(e)         (openinfo.lorder == BYTE_ORDER ? \
 357                         (uint32_t)(e) : \
 358                         bswap32((uint32_t)(e)))
 359                 if (!is_comment &&
 360                     (!username || (strcmp(username, pwd.pw_name) == 0))) {
 361                         /* Create insecure data. */
 362                         p = buf;
 363                         COMPACT(pwd.pw_name);
 364                         COMPACT("*");
 365                         SCALAR(pwd.pw_uid);
 366                         SCALAR(pwd.pw_gid);
 367                         SCALAR(pwd.pw_change);
 368                         COMPACT(pwd.pw_class);
 369                         COMPACT(pwd.pw_gecos);
 370                         COMPACT(pwd.pw_dir);
 371                         COMPACT(pwd.pw_shell);
 372                         SCALAR(pwd.pw_expire);
 373                         SCALAR(pwd.pw_fields);
 374                         data.size = p - buf;
 375
 376                         /* Create secure data. */
 377                         p = sbuf;
 378                         COMPACT(pwd.pw_name);
 379                         COMPACT(pwd.pw_passwd);
 380                         SCALAR(pwd.pw_uid);
 381                         SCALAR(pwd.pw_gid);
 382                         SCALAR(pwd.pw_change);
 383                         COMPACT(pwd.pw_class);
 384                         COMPACT(pwd.pw_gecos);
 385                         COMPACT(pwd.pw_dir);
 386                         COMPACT(pwd.pw_shell);
 387                         SCALAR(pwd.pw_expire);
 388                         SCALAR(pwd.pw_fields);
 389                         sdata.size = p - sbuf;
 390
 391                         /* Store insecure by name. */
 392                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYNAME);
 393                         len = strlen(pwd.pw_name);
 394                         memmove(tbuf + 1, pwd.pw_name, len);
 395                         key.size = len + 1;
 396                         if ((dp->put)(dp, &key, &data, method) == -1)
 397                                 error("put");
 398
 399                         /* Store insecure by number. */
 400                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYNUM);
 401                         store = htonl(cnt);
 402                         memmove(tbuf + 1, &store, sizeof(store));
 403                         key.size = sizeof(store) + 1;
 404                         if ((dp->put)(dp, &key, &data, method) == -1)
 405                                 error("put");
 406
 407                         /* Store insecure by uid. */
 408                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYUID);
 409                         store = htonl(pwd.pw_uid);
 410                         memmove(tbuf + 1, &store, sizeof(store));
 411                         key.size = sizeof(store) + 1;
 412                         if ((dp->put)(dp, &key, &data, methoduid) == -1)
 413                                 error("put");
 414
 415                         /* Store secure by name. */
 416                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYNAME);
 417                         len = strlen(pwd.pw_name);
 418                         memmove(tbuf + 1, pwd.pw_name, len);
 419                         key.size = len + 1;
 420                         if ((sdp->put)(sdp, &key, &sdata, method) == -1)
 421                                 error("put");
 422
 423                         /* Store secure by number. */
 424                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYNUM);
 425                         store = htonl(cnt);
 426                         memmove(tbuf + 1, &store, sizeof(store));
 427                         key.size = sizeof(store) + 1;
 428                         if ((sdp->put)(sdp, &key, &sdata, method) == -1)
 429                                 error("put");
 430
 431                         /* Store secure by uid. */
 432                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYUID);
 433                         store = htonl(pwd.pw_uid);
 434                         memmove(tbuf + 1, &store, sizeof(store));
 435                         key.size = sizeof(store) + 1;
 436                         if ((sdp->put)(sdp, &key, &sdata, methoduid) == -1)
 437                                 error("put");
 438
 439                         /* Store insecure and secure special plus and special minus */
 440                         if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') {
 441                                 tbuf[0] = CURRENT_VERSION(_PW_KEYYPBYNUM);
 442                                 store = htonl(ypcnt);
 443                                 memmove(tbuf + 1, &store, sizeof(store));
 444                                 ypcnt++;
 445                                 key.size = sizeof(store) + 1;
 446                                 if ((dp->put)(dp, &key, &data, method) == -1)
 447                                         error("put");
 448                                 if ((sdp->put)(sdp, &key, &sdata, method) == -1)
 449                                         error("put");
 450                         }
 451
 452                         /* Create insecure data. (legacy version) */
 453                         p = buf;
 454                         COMPACT(pwd.pw_name);
 455                         COMPACT("*");
 456                         LSCALAR(pwd.pw_uid);
 457                         LSCALAR(pwd.pw_gid);
 458                         LSCALAR(pwd.pw_change);
 459                         COMPACT(pwd.pw_class);
 460                         COMPACT(pwd.pw_gecos);
 461                         COMPACT(pwd.pw_dir);
 462                         COMPACT(pwd.pw_shell);
 463                         LSCALAR(pwd.pw_expire);
 464                         LSCALAR(pwd.pw_fields);
 465                         data.size = p - buf;
 466
 467                         /* Create secure data. (legacy version) */
 468                         p = sbuf;
 469                         COMPACT(pwd.pw_name);
 470                         COMPACT(pwd.pw_passwd);
 471                         LSCALAR(pwd.pw_uid);
 472                         LSCALAR(pwd.pw_gid);
 473                         LSCALAR(pwd.pw_change);
 474                         COMPACT(pwd.pw_class);
 475                         COMPACT(pwd.pw_gecos);
 476                         COMPACT(pwd.pw_dir);
 477                         COMPACT(pwd.pw_shell);
 478                         LSCALAR(pwd.pw_expire);
 479                         LSCALAR(pwd.pw_fields);
 480                         sdata.size = p - sbuf;
 481
 482                         /* Store insecure by name. */
 483                         tbuf[0] = LEGACY_VERSION(_PW_KEYBYNAME);
 484                         len = strlen(pwd.pw_name);
 485                         memmove(tbuf + 1, pwd.pw_name, len);
 486                         key.size = len + 1;
 487                         if ((dp->put)(dp, &key, &data, method) == -1)
 488                                 error("put");
 489
 490                         /* Store insecure by number. */
 491                         tbuf[0] = LEGACY_VERSION(_PW_KEYBYNUM);
 492                         store = HTOL(cnt);
 493                         memmove(tbuf + 1, &store, sizeof(store));
 494                         key.size = sizeof(store) + 1;
 495                         if ((dp->put)(dp, &key, &data, method) == -1)
 496                                 error("put");
 497
 498                         /* Store insecure by uid. */
 499                         tbuf[0] = LEGACY_VERSION(_PW_KEYBYUID);
 500                         store = HTOL(pwd.pw_uid);
 501                         memmove(tbuf + 1, &store, sizeof(store));
 502                         key.size = sizeof(store) + 1;
 503                         if ((dp->put)(dp, &key, &data, methoduid) == -1)
 504                                 error("put");
 505
 506                         /* Store secure by name. */
 507                         tbuf[0] = LEGACY_VERSION(_PW_KEYBYNAME);
 508                         len = strlen(pwd.pw_name);
 509                         memmove(tbuf + 1, pwd.pw_name, len);
 510                         key.size = len + 1;
 511                         if ((sdp->put)(sdp, &key, &sdata, method) == -1)
 512                                 error("put");
 513
 514                         /* Store secure by number. */
 515                         tbuf[0] = LEGACY_VERSION(_PW_KEYBYNUM);
 516                         store = HTOL(cnt);
 517                         memmove(tbuf + 1, &store, sizeof(store));
 518                         key.size = sizeof(store) + 1;
 519                         if ((sdp->put)(sdp, &key, &sdata, method) == -1)
 520                                 error("put");
 521
 522                         /* Store secure by uid. */
 523                         tbuf[0] = LEGACY_VERSION(_PW_KEYBYUID);
 524                         store = HTOL(pwd.pw_uid);
 525                         memmove(tbuf + 1, &store, sizeof(store));
 526                         key.size = sizeof(store) + 1;
 527                         if ((sdp->put)(sdp, &key, &sdata, methoduid) == -1)
 528                                 error("put");
 529
 530                         /* Store insecure and secure special plus and special minus */
 531                         if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') {
 532                                 tbuf[0] = LEGACY_VERSION(_PW_KEYYPBYNUM);
 533                                 store = HTOL(ypcnt);
 534                                 memmove(tbuf + 1, &store, sizeof(store));
 535                                 ypcnt++;
 536                                 key.size = sizeof(store) + 1;
 537                                 if ((dp->put)(dp, &key, &data, method) == -1)
 538                                         error("put");
 539                                 if ((sdp->put)(sdp, &key, &sdata, method) == -1)
 540                                         error("put");
 541                         }
 542                 }
 543                 /* Create original format password file entry */
 544                 if (is_comment && makeold){     /* copy comments */
 545                         if (fprintf(oldfp, "%s\n", line) < 0)
 546                                 error("write old");
 547                 } else if (makeold) {
 548                         char uidstr[20];
 549                         char gidstr[20];
 550
 551                         snprintf(uidstr, sizeof(uidstr), "%u", pwd.pw_uid);
 552                         snprintf(gidstr, sizeof(gidstr), "%u", pwd.pw_gid);
 553
 554                         if (fprintf(oldfp, "%s:*:%s:%s:%s:%s:%s\n",
 555                             pwd.pw_name, pwd.pw_fields & _PWF_UID ? uidstr : "",
 556                             pwd.pw_fields & _PWF_GID ? gidstr : "",
 557                             pwd.pw_gecos, pwd.pw_dir, pwd.pw_shell) < 0)
 558                                 error("write old");
 559                 }
 560         }
 561         /* If YP enabled, set flag. */
 562         if (yp_enabled) {
 563                 buf[0] = yp_enabled + 2;
 564                 data.size = 1;
 565                 key.size = 1;
 566                 tbuf[0] = CURRENT_VERSION(_PW_KEYYPENABLED);
 567                 if ((dp->put)(dp, &key, &data, method) == -1)
 568                         error("put");
 569                 if ((sdp->put)(sdp, &key, &data, method) == -1)
 570                         error("put");
 571                 tbuf[0] = LEGACY_VERSION(_PW_KEYYPENABLED);
 572                 key.size = 1;
 573                 if ((dp->put)(dp, &key, &data, method) == -1)
 574                         error("put");
 575                 if ((sdp->put)(sdp, &key, &data, method) == -1)
 576                         error("put");
 577         }
 578
 579         if ((dp->close)(dp) == -1)
 580                 error("close");
 581         if ((sdp->close)(sdp) == -1)
 582                 error("close");
 583         if (makeold) {
 584                 fflush(oldfp);
 585                 if (fclose(oldfp) == EOF)
 586                         error("close old");
 587         }
 588
 589         /* Set master.passwd permissions, in case caller forgot. */
 590         fchmod(fileno(fp), S_IRUSR|S_IWUSR);
 591
 592         /* Install as the real password files. */
 593         snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB);
 594         snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB);
 595         mv(buf, buf2);
 596         snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB);
 597         snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _SMP_DB);
 598         mv(buf, buf2);
 599         if (makeold) {
 600                 snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _PASSWD);
 601                 snprintf(buf, sizeof(buf), "%s.orig", pname);
 602                 mv(buf, buf2);
 603         }
 604         /*
 605          * Move the master password LAST -- chpass(1), passwd(1) and vipw(8)
 606          * all use flock(2) on it to block other incarnations of themselves.
 607          * The rename means that everything is unlocked, as the original file
 608          * can no longer be accessed.
 609          */
 610         snprintf(buf, sizeof(buf), "%s/%s", prefix, _MASTERPASSWD);
 611         mv(pname, buf);
 612
 613         /*
 614          * Close locked password file after rename()
 615          */
 616         if (fclose(fp) == EOF)
 617                 error("close fp");
 618
 619         exit(0);
 620 }
 621
 622 int
 623 scan(FILE *fp, struct passwd *pw)
 624 {
 625         static int lcnt;
 626         size_t len;
 627         char *p;
 628
 629         p = fgetln(fp, &len);
 630         if (p == NULL)
 631                 return (0);
 632         ++lcnt;
 633         /*
 634          * ``... if I swallow anything evil, put your fingers down my
 635          * throat...''
 636          *      -- The Who
 637          */
 638         if (len > 0 && p[len - 1] == '\n')
 639                 len--;
 640         if (len >= sizeof(line) - 1) {
 641                 warnx("line #%d too long", lcnt);
 642                 goto fmt;
 643         }
 644         memcpy(line, p, len);
 645         line[len] = '\0';
 646
 647         /*
 648          * Ignore comments: ^[ \t]*#
 649          */
 650         for (p = line; *p != '\0'; p++)
 651                 if (*p != ' ' && *p != '\t')
 652                         break;
 653         if (*p == '#' || *p == '\0') {
 654                 is_comment = 1;
 655                 return(1);
 656         } else
 657                 is_comment = 0;
 658
 659         if (!__pw_scan(line, pw, _PWSCAN_WARN|_PWSCAN_MASTER)) {
 660                 warnx("at line #%d", lcnt);
 661 fmt:            errno = EFTYPE; /* XXX */
 662                 error(pname);
 663         }
 664
 665         return (1);
 666 }
 667
 668 void
 669 cp(char *from, char *to, mode_t mode)
 670 {
 671         static char buf[MAXBSIZE];
 672         int from_fd, rcount, to_fd, wcount;
 673
 674         if ((from_fd = open(from, O_RDONLY, 0)) < 0)
 675                 error(from);
 676         if ((to_fd = open(to, O_WRONLY|O_CREAT|O_EXCL, mode)) < 0)
 677                 error(to);
 678         while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
 679                 wcount = write(to_fd, buf, rcount);
 680                 if (rcount != wcount || wcount == -1) {
 681                         int sverrno = errno;
 682
 683                         snprintf(buf, sizeof(buf), "%s to %s", from, to);
 684                         errno = sverrno;
 685                         error(buf);
 686                 }
 687         }
 688         if (rcount < 0) {
 689                 int sverrno = errno;
 690
 691                 snprintf(buf, sizeof(buf), "%s to %s", from, to);
 692                 errno = sverrno;
 693                 error(buf);
 694         }
 695 }
 696
 697
 698 void
 699 mv(char *from, char *to)
 700 {
 701         char buf[MAXPATHLEN];
 702
 703         if (rename(from, to)) {
 704                 int sverrno = errno;
 705                 snprintf(buf, sizeof(buf), "%s to %s", from, to);
 706                 errno = sverrno;
 707                 error(buf);
 708         }
 709 }
 710
 711 void
 712 error(const char *name)
 713 {
 714
 715         warn("%s", name);
 716         cleanup();
 717         exit(1);
 718 }
 719
 720 void
 721 cleanup(void)
 722 {
 723         char buf[MAXPATHLEN];
 724
 725         switch(clean) {
 726         case FILE_ORIG:
 727                 snprintf(buf, sizeof(buf), "%s.orig", pname);
 728                 unlink(buf);
 729                 /* FALLTHROUGH */
 730         case FILE_SECURE:
 731                 snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB);
 732                 unlink(buf);
 733                 /* FALLTHROUGH */
 734         case FILE_INSECURE:
 735                 snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB);
 736                 unlink(buf);
 737         }
 738 }
 739
 740 static void
 741 usage(void)
 742 {
 743
 744         fprintf(stderr,
 745 "usage: pwd_mkdb [-BCiLNp] [-d directory] [-s cachesize] [-u username] file\n");
 746         exit(1);
 747 }