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  * 4. 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
  30 #if 0
  31 #ifndef lint
  32 static const char copyright[] =
  33 "@(#) Copyright (c) 1991, 1993, 1994\n\
  34         The Regents of the University of California.  All rights reserved.\n";
  35 #endif /* not lint */
  36
  37 #ifndef lint
  38 static char sccsid[] = "@(#)pwd_mkdb.c  8.5 (Berkeley) 4/20/94";
  39 #endif /* not lint */
  40 #endif
  41
  42 #include <sys/cdefs.h>
  43 __FBSDID("$FreeBSD$");
  44
  45 #include <sys/param.h>
  46 #include <sys/endian.h>
  47 #include <sys/stat.h>
  48 #include <arpa/inet.h>
  49
  50 #include <db.h>
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <fcntl.h>
  54 #include <libgen.h>
  55 #include <limits.h>
  56 #include <pwd.h>
  57 #include <signal.h>
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include <unistd.h>
  62
  63 #include "pw_scan.h"
  64
  65 #define INSECURE        1
  66 #define SECURE          2
  67 #define PERM_INSECURE   (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)
  68 #define PERM_SECURE     (S_IRUSR|S_IWUSR)
  69 #define LEGACY_VERSION(x)  _PW_VERSIONED(x, 3)
  70 #define CURRENT_VERSION(x) _PW_VERSIONED(x, 4)
  71
  72 static HASHINFO openinfo = {
  73         4096,           /* bsize */
  74         32,             /* ffactor */
  75         256,            /* nelem */
  76         2048 * 1024,    /* cachesize */
  77         NULL,           /* hash() */
  78         BYTE_ORDER      /* lorder */
  79 };
  80
  81 static enum state { FILE_INSECURE, FILE_SECURE, FILE_ORIG } clean;
  82 static struct passwd pwd;                       /* password structure */
  83 static char *pname;                             /* password file name */
  84 static char prefix[MAXPATHLEN];
  85
  86 static int is_comment;  /* flag for comments */
  87 static char line[LINE_MAX];
  88
  89 void    cleanup(void);
  90 void    error(const char *);
  91 void    cp(char *, char *, mode_t mode);
  92 void    mv(char *, char *);
  93 int     scan(FILE *, struct passwd *);
  94 static void     usage(void);
  95
  96 int
  97 main(int argc, char *argv[])
  98 {
  99         static char verskey[] = _PWD_VERSION_KEY;
 100         char version = _PWD_CURRENT_VERSION;
 101         DB *dp, *sdp, *pw_db;
 102         DBT data, sdata, key;
 103         FILE *fp, *oldfp;
 104         sigset_t set;
 105         int ch, cnt, ypcnt, makeold, tfd, yp_enabled = 0;
 106         unsigned int len;
 107         uint32_t store;
 108         const char *t;
 109         char *p;
 110         char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], tbuf[1024];
 111         char sbuf[MAX(MAXPATHLEN, LINE_MAX * 2)];
 112         char buf2[MAXPATHLEN];
 113         char sbuf2[MAXPATHLEN];
 114         char *username;
 115         u_int method, methoduid;
 116         int Cflag, dflag, iflag, lflag;
 117         int nblock = 0;
 118
 119         iflag = dflag = Cflag = lflag = 0;
 120         strcpy(prefix, _PATH_PWD);
 121         makeold = 0;
 122         username = NULL;
 123         oldfp = NULL;
 124         while ((ch = getopt(argc, argv, "BCLlNd:ips:u:v")) != -1)
 125                 switch(ch) {
 126                 case 'B':                       /* big-endian output */
 127                         openinfo.lorder = BIG_ENDIAN;
 128                         break;
 129                 case 'C':                       /* verify only */
 130                         Cflag = 1;
 131                         break;
 132                 case 'l':                       /* generate legacy entries */
 133                         lflag = 1;
 134                         break;
 135                 case 'L':                       /* little-endian output */
 136                         openinfo.lorder = LITTLE_ENDIAN;
 137                         break;
 138                 case 'N':                       /* do not wait for lock */
 139                         nblock = LOCK_NB;       /* will fail if locked */
 140                         break;
 141                 case 'd':
 142                         dflag++;
 143                         strlcpy(prefix, optarg, sizeof(prefix));
 144                         break;
 145                 case 'i':
 146                         iflag++;
 147                         break;
 148                 case 'p':                       /* create V7 "file.orig" */
 149                         makeold = 1;
 150                         break;
 151                 case 's':                       /* change default cachesize */
 152                         openinfo.cachesize = atoi(optarg) * 1024 * 1024;
 153                         break;
 154                 case 'u':                       /* only update this record */
 155                         username = optarg;
 156                         break;
 157                 case 'v':                       /* backward compatible */
 158                         break;
 159                 default:
 160                         usage();
 161                 }
 162         argc -= optind;
 163         argv += optind;
 164
 165         if (argc != 1 || (username && (*username == '+' || *username == '-')))
 166                 usage();
 167
 168         /*
 169          * This could be changed to allow the user to interrupt.
 170          * Probably not worth the effort.
 171          */
 172         sigemptyset(&set);
 173         sigaddset(&set, SIGTSTP);
 174         sigaddset(&set, SIGHUP);
 175         sigaddset(&set, SIGINT);
 176         sigaddset(&set, SIGQUIT);
 177         sigaddset(&set, SIGTERM);
 178         (void)sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL);
 179
 180         /* We don't care what the user wants. */
 181         (void)umask(0);
 182
 183         pname = *argv;
 184
 185         /*
 186          * Open and lock the original password file.  We have to check
 187          * the hardlink count after we get the lock to handle any potential
 188          * unlink/rename race.
 189          *
 190          * This lock is necessary when someone runs pwd_mkdb manually, directly
 191          * on master.passwd, to handle the case where a user might try to
 192          * change his password while pwd_mkdb is running.
 193          */
 194         for (;;) {
 195                 struct stat st;
 196
 197                 if (!(fp = fopen(pname, "r")))
 198                         error(pname);
 199                 if (flock(fileno(fp), LOCK_EX|nblock) < 0 && !(dflag && iflag))
 200                         error("flock");
 201                 if (fstat(fileno(fp), &st) < 0)
 202                         error(pname);
 203                 if (st.st_nlink != 0)
 204                         break;
 205                 fclose(fp);
 206                 fp = NULL;
 207         }
 208
 209         /* check only if password database is valid */
 210         if (Cflag) {
 211                 while (scan(fp, &pwd))
 212                         if (!is_comment && strlen(pwd.pw_name) >= MAXLOGNAME) {
 213                                 warnx("%s: username too long", pwd.pw_name);
 214                                 exit(1);
 215                         }
 216                 exit(0);
 217         }
 218
 219         /* Open the temporary insecure password database. */
 220         (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB);
 221         (void)snprintf(sbuf, sizeof(sbuf), "%s/%s.tmp", prefix, _SMP_DB);
 222         if (username) {
 223                 int use_version;
 224
 225                 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB);
 226                 (void)snprintf(sbuf2, sizeof(sbuf2), "%s/%s", prefix, _SMP_DB);
 227
 228                 clean = FILE_INSECURE;
 229                 cp(buf2, buf, PERM_INSECURE);
 230                 dp = dbopen(buf,
 231                     O_RDWR|O_EXCL|O_SYNC, PERM_INSECURE, DB_HASH, &openinfo);
 232                 if (dp == NULL)
 233                         error(buf);
 234
 235                 clean = FILE_SECURE;
 236                 cp(sbuf2, sbuf, PERM_SECURE);
 237                 sdp = dbopen(sbuf,
 238                     O_RDWR|O_EXCL|O_SYNC, PERM_SECURE, DB_HASH, &openinfo);
 239                 if (sdp == NULL)
 240                         error(sbuf);
 241
 242                 /*
 243                  * Do some trouble to check if we should store this users
 244                  * uid. Don't use getpwnam/getpwuid as that interferes
 245                  * with NIS.
 246                  */
 247                 pw_db = dbopen(_PATH_MP_DB, O_RDONLY, 0, DB_HASH, NULL);
 248                 if (!pw_db)
 249                         error(_MP_DB);
 250
 251                 key.data = verskey;
 252                 key.size = sizeof(verskey)-1;
 253                 if ((pw_db->get)(pw_db, &key, &data, 0) == 0)
 254                         use_version = *(unsigned char *)data.data;
 255                 else
 256                         use_version = 3;
 257                 buf[0] = _PW_VERSIONED(_PW_KEYBYNAME, use_version);
 258                 len = strlen(username);
 259
 260                 /* Only check that username fits in buffer */
 261                 memmove(buf + 1, username, MIN(len, sizeof(buf) - 1));
 262                 key.data = (u_char *)buf;
 263                 key.size = len + 1;
 264                 if ((pw_db->get)(pw_db, &key, &data, 0) == 0) {
 265                         p = (char *)data.data;
 266
 267                         /* jump over pw_name and pw_passwd, to get to pw_uid */
 268                         while (*p++)
 269                                 ;
 270                         while (*p++)
 271                                 ;
 272
 273                         buf[0] = _PW_VERSIONED(_PW_KEYBYUID, use_version);
 274                         memmove(buf + 1, p, sizeof(store));
 275                         key.data = (u_char *)buf;
 276                         key.size = sizeof(store) + 1;
 277
 278                         if ((pw_db->get)(pw_db, &key, &data, 0) == 0) {
 279                                 /* First field of data.data holds pw_pwname */
 280                                 if (!strcmp(data.data, username))
 281                                         methoduid = 0;
 282                                 else
 283                                         methoduid = R_NOOVERWRITE;
 284                         } else {
 285                                 methoduid = R_NOOVERWRITE;
 286                         }
 287                 } else {
 288                         methoduid = R_NOOVERWRITE;
 289                 }
 290                 if ((pw_db->close)(pw_db))
 291                         error("close pw_db");
 292                 method = 0;
 293         } else {
 294                 dp = dbopen(buf,
 295                     O_RDWR|O_CREAT|O_EXCL|O_SYNC, PERM_INSECURE, DB_HASH, &openinfo);
 296                 if (dp == NULL)
 297                         error(buf);
 298                 clean = FILE_INSECURE;
 299
 300                 sdp = dbopen(sbuf,
 301                     O_RDWR|O_CREAT|O_EXCL|O_SYNC, PERM_SECURE, DB_HASH, &openinfo);
 302                 if (sdp == NULL)
 303                         error(sbuf);
 304                 clean = FILE_SECURE;
 305
 306                 method = R_NOOVERWRITE;
 307                 methoduid = R_NOOVERWRITE;
 308         }
 309
 310         /*
 311          * Open file for old password file.  Minor trickiness -- don't want to
 312          * chance the file already existing, since someone (stupidly) might
 313          * still be using this for permission checking.  So, open it first and
 314          * fdopen the resulting fd.  The resulting file should be readable by
 315          * everyone.
 316          */
 317         if (makeold) {
 318                 (void)snprintf(buf, sizeof(buf), "%s.orig", pname);
 319                 if ((tfd = open(buf,
 320                     O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0)
 321                         error(buf);
 322                 if ((oldfp = fdopen(tfd, "w")) == NULL)
 323                         error(buf);
 324                 clean = FILE_ORIG;
 325         }
 326
 327         /*
 328          * The databases actually contain three copies of the original data.
 329          * Each password file entry is converted into a rough approximation
 330          * of a ``struct passwd'', with the strings placed inline.  This
 331          * object is then stored as the data for three separate keys.  The
 332          * first key * is the pw_name field prepended by the _PW_KEYBYNAME
 333          * character.  The second key is the pw_uid field prepended by the
 334          * _PW_KEYBYUID character.  The third key is the line number in the
 335          * original file prepended by the _PW_KEYBYNUM character.  (The special
 336          * characters are prepended to ensure that the keys do not collide.)
 337          */
 338         /* In order to transition this file into a machine-independent
 339          * form, we have to change the format of entries.  However, since
 340          * older binaries will still expect the old MD format entries, we
 341          * create those as usual and use versioned tags for the new entries.
 342          */
 343         if (username == NULL) {
 344                 /* Do not add the VERSION tag when updating a single
 345                  * user.  When operating on `old format' databases, this
 346                  * would result in applications `seeing' only the updated
 347                  * entries.
 348                  */
 349                 key.data = verskey;
 350                 key.size = sizeof(verskey)-1;
 351                 data.data = &version;
 352                 data.size = 1;
 353                 if ((dp->put)(dp, &key, &data, 0) == -1)
 354                         error("put");
 355                 if ((dp->put)(sdp, &key, &data, 0) == -1)
 356                         error("put");
 357         }
 358         ypcnt = 0;
 359         data.data = (u_char *)buf;
 360         sdata.data = (u_char *)sbuf;
 361         key.data = (u_char *)tbuf;
 362         for (cnt = 1; scan(fp, &pwd); ++cnt) {
 363                 if (!is_comment &&
 364                     (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-')) {
 365                         yp_enabled = 1;
 366                         ypcnt++;
 367                 }
 368                 if (is_comment)
 369                         --cnt;
 370 #define COMPACT(e)      t = e; while ((*p++ = *t++));
 371 #define SCALAR(e)       store = htonl((uint32_t)(e));      \
 372                         memmove(p, &store, sizeof(store)); \
 373                         p += sizeof(store);
 374 #define LSCALAR(e)      store = HTOL((uint32_t)(e));       \
 375                         memmove(p, &store, sizeof(store)); \
 376                         p += sizeof(store);
 377 #define HTOL(e)         (openinfo.lorder == BYTE_ORDER ? \
 378                         (uint32_t)(e) : \
 379                         bswap32((uint32_t)(e)))
 380                 if (!is_comment &&
 381                     (!username || (strcmp(username, pwd.pw_name) == 0))) {
 382                         /* Create insecure data. */
 383                         p = buf;
 384                         COMPACT(pwd.pw_name);
 385                         COMPACT("*");
 386                         SCALAR(pwd.pw_uid);
 387                         SCALAR(pwd.pw_gid);
 388                         SCALAR(pwd.pw_change);
 389                         COMPACT(pwd.pw_class);
 390                         COMPACT(pwd.pw_gecos);
 391                         COMPACT(pwd.pw_dir);
 392                         COMPACT(pwd.pw_shell);
 393                         SCALAR(pwd.pw_expire);
 394                         SCALAR(pwd.pw_fields);
 395                         data.size = p - buf;
 396
 397                         /* Create secure data. */
 398                         p = sbuf;
 399                         COMPACT(pwd.pw_name);
 400                         COMPACT(pwd.pw_passwd);
 401                         SCALAR(pwd.pw_uid);
 402                         SCALAR(pwd.pw_gid);
 403                         SCALAR(pwd.pw_change);
 404                         COMPACT(pwd.pw_class);
 405                         COMPACT(pwd.pw_gecos);
 406                         COMPACT(pwd.pw_dir);
 407                         COMPACT(pwd.pw_shell);
 408                         SCALAR(pwd.pw_expire);
 409                         SCALAR(pwd.pw_fields);
 410                         sdata.size = p - sbuf;
 411
 412                         /* Store insecure by name. */
 413                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYNAME);
 414                         len = strlen(pwd.pw_name);
 415                         memmove(tbuf + 1, pwd.pw_name, len);
 416                         key.size = len + 1;
 417                         if ((dp->put)(dp, &key, &data, method) == -1)
 418                                 error("put");
 419
 420                         /* Store insecure by number. */
 421                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYNUM);
 422                         store = htonl(cnt);
 423                         memmove(tbuf + 1, &store, sizeof(store));
 424                         key.size = sizeof(store) + 1;
 425                         if ((dp->put)(dp, &key, &data, method) == -1)
 426                                 error("put");
 427
 428                         /* Store insecure by uid. */
 429                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYUID);
 430                         store = htonl(pwd.pw_uid);
 431                         memmove(tbuf + 1, &store, sizeof(store));
 432                         key.size = sizeof(store) + 1;
 433                         if ((dp->put)(dp, &key, &data, methoduid) == -1)
 434                                 error("put");
 435
 436                         /* Store secure by name. */
 437                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYNAME);
 438                         len = strlen(pwd.pw_name);
 439                         memmove(tbuf + 1, pwd.pw_name, len);
 440                         key.size = len + 1;
 441                         if ((sdp->put)(sdp, &key, &sdata, method) == -1)
 442                                 error("put");
 443
 444                         /* Store secure by number. */
 445                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYNUM);
 446                         store = htonl(cnt);
 447                         memmove(tbuf + 1, &store, sizeof(store));
 448                         key.size = sizeof(store) + 1;
 449                         if ((sdp->put)(sdp, &key, &sdata, method) == -1)
 450                                 error("put");
 451
 452                         /* Store secure by uid. */
 453                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYUID);
 454                         store = htonl(pwd.pw_uid);
 455                         memmove(tbuf + 1, &store, sizeof(store));
 456                         key.size = sizeof(store) + 1;
 457                         if ((sdp->put)(sdp, &key, &sdata, methoduid) == -1)
 458                                 error("put");
 459
 460                         /* Store insecure and secure special plus and special minus */
 461                         if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') {
 462                                 tbuf[0] = CURRENT_VERSION(_PW_KEYYPBYNUM);
 463                                 store = htonl(ypcnt);
 464                                 memmove(tbuf + 1, &store, sizeof(store));
 465                                 key.size = sizeof(store) + 1;
 466                                 if ((dp->put)(dp, &key, &data, method) == -1)
 467                                         error("put");
 468                                 if ((sdp->put)(sdp, &key, &sdata, method) == -1)
 469                                         error("put");
 470                         }
 471
 472                         if (lflag) {
 473                                 /* Create insecure data. (legacy version) */
 474                                 p = buf;
 475                                 COMPACT(pwd.pw_name);
 476                                 COMPACT("*");
 477                                 LSCALAR(pwd.pw_uid);
 478                                 LSCALAR(pwd.pw_gid);
 479                                 LSCALAR(pwd.pw_change);
 480                                 COMPACT(pwd.pw_class);
 481                                 COMPACT(pwd.pw_gecos);
 482                                 COMPACT(pwd.pw_dir);
 483                                 COMPACT(pwd.pw_shell);
 484                                 LSCALAR(pwd.pw_expire);
 485                                 LSCALAR(pwd.pw_fields);
 486                                 data.size = p - buf;
 487
 488                                 /* Create secure data. (legacy version) */
 489                                 p = sbuf;
 490                                 COMPACT(pwd.pw_name);
 491                                 COMPACT(pwd.pw_passwd);
 492                                 LSCALAR(pwd.pw_uid);
 493                                 LSCALAR(pwd.pw_gid);
 494                                 LSCALAR(pwd.pw_change);
 495                                 COMPACT(pwd.pw_class);
 496                                 COMPACT(pwd.pw_gecos);
 497                                 COMPACT(pwd.pw_dir);
 498                                 COMPACT(pwd.pw_shell);
 499                                 LSCALAR(pwd.pw_expire);
 500                                 LSCALAR(pwd.pw_fields);
 501                                 sdata.size = p - sbuf;
 502
 503                                 /* Store insecure by name. */
 504                                 tbuf[0] = LEGACY_VERSION(_PW_KEYBYNAME);
 505                                 len = strlen(pwd.pw_name);
 506                                 memmove(tbuf + 1, pwd.pw_name, len);
 507                                 key.size = len + 1;
 508                                 if ((dp->put)(dp, &key, &data, method) == -1)
 509                                         error("put");
 510
 511                                 /* Store insecure by number. */
 512                                 tbuf[0] = LEGACY_VERSION(_PW_KEYBYNUM);
 513                                 store = HTOL(cnt);
 514                                 memmove(tbuf + 1, &store, sizeof(store));
 515                                 key.size = sizeof(store) + 1;
 516                                 if ((dp->put)(dp, &key, &data, method) == -1)
 517                                         error("put");
 518
 519                                 /* Store insecure by uid. */
 520                                 tbuf[0] = LEGACY_VERSION(_PW_KEYBYUID);
 521                                 store = HTOL(pwd.pw_uid);
 522                                 memmove(tbuf + 1, &store, sizeof(store));
 523                                 key.size = sizeof(store) + 1;
 524                                 if ((dp->put)(dp, &key, &data, methoduid) == -1)
 525                                         error("put");
 526
 527                                 /* Store secure by name. */
 528                                 tbuf[0] = LEGACY_VERSION(_PW_KEYBYNAME);
 529                                 len = strlen(pwd.pw_name);
 530                                 memmove(tbuf + 1, pwd.pw_name, len);
 531                                 key.size = len + 1;
 532                                 if ((sdp->put)(sdp, &key, &sdata, method) == -1)
 533                                         error("put");
 534
 535                                 /* Store secure by number. */
 536                                 tbuf[0] = LEGACY_VERSION(_PW_KEYBYNUM);
 537                                 store = HTOL(cnt);
 538                                 memmove(tbuf + 1, &store, sizeof(store));
 539                                 key.size = sizeof(store) + 1;
 540                                 if ((sdp->put)(sdp, &key, &sdata, method) == -1)
 541                                         error("put");
 542
 543                                 /* Store secure by uid. */
 544                                 tbuf[0] = LEGACY_VERSION(_PW_KEYBYUID);
 545                                 store = HTOL(pwd.pw_uid);
 546                                 memmove(tbuf + 1, &store, sizeof(store));
 547                                 key.size = sizeof(store) + 1;
 548                                 if ((sdp->put)(sdp, &key, &sdata, methoduid) == -1)
 549                                         error("put");
 550
 551                                 /* Store insecure and secure special plus and special minus */
 552                                 if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') {
 553                                         tbuf[0] = LEGACY_VERSION(_PW_KEYYPBYNUM);
 554                                         store = HTOL(ypcnt);
 555                                         memmove(tbuf + 1, &store, sizeof(store));
 556                                         key.size = sizeof(store) + 1;
 557                                         if ((dp->put)(dp, &key, &data, method) == -1)
 558                                                 error("put");
 559                                         if ((sdp->put)(sdp, &key, &sdata, method) == -1)
 560                                                 error("put");
 561                                 }
 562                         }
 563                 }
 564                 /* Create original format password file entry */
 565                 if (is_comment && makeold){     /* copy comments */
 566                         if (fprintf(oldfp, "%s\n", line) < 0)
 567                                 error("write old");
 568                 } else if (makeold) {
 569                         char uidstr[20];
 570                         char gidstr[20];
 571
 572                         snprintf(uidstr, sizeof(uidstr), "%u", pwd.pw_uid);
 573                         snprintf(gidstr, sizeof(gidstr), "%u", pwd.pw_gid);
 574
 575                         if (fprintf(oldfp, "%s:*:%s:%s:%s:%s:%s\n",
 576                             pwd.pw_name, pwd.pw_fields & _PWF_UID ? uidstr : "",
 577                             pwd.pw_fields & _PWF_GID ? gidstr : "",
 578                             pwd.pw_gecos, pwd.pw_dir, pwd.pw_shell) < 0)
 579                                 error("write old");
 580                 }
 581         }
 582         /* If YP enabled, set flag. */
 583         if (yp_enabled) {
 584                 buf[0] = yp_enabled + 2;
 585                 data.size = 1;
 586                 key.size = 1;
 587                 tbuf[0] = CURRENT_VERSION(_PW_KEYYPENABLED);
 588                 if ((dp->put)(dp, &key, &data, method) == -1)
 589                         error("put");
 590                 if ((sdp->put)(sdp, &key, &data, method) == -1)
 591                         error("put");
 592                 if (lflag) {
 593                         tbuf[0] = LEGACY_VERSION(_PW_KEYYPENABLED);
 594                         key.size = 1;
 595                         if ((dp->put)(dp, &key, &data, method) == -1)
 596                                 error("put");
 597                         if ((sdp->put)(sdp, &key, &data, method) == -1)
 598                                 error("put");
 599                 }
 600         }
 601
 602         if ((dp->close)(dp) == -1)
 603                 error("close");
 604         if ((sdp->close)(sdp) == -1)
 605                 error("close");
 606         if (makeold) {
 607                 (void)fflush(oldfp);
 608                 if (fclose(oldfp) == EOF)
 609                         error("close old");
 610         }
 611
 612         /* Set master.passwd permissions, in case caller forgot. */
 613         (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR);
 614
 615         /* Install as the real password files. */
 616         (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB);
 617         (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB);
 618         mv(buf, buf2);
 619         (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB);
 620         (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _SMP_DB);
 621         mv(buf, buf2);
 622         if (makeold) {
 623                 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _PASSWD);
 624                 (void)snprintf(buf, sizeof(buf), "%s.orig", pname);
 625                 mv(buf, buf2);
 626         }
 627         /*
 628          * Move the master password LAST -- chpass(1), passwd(1) and vipw(8)
 629          * all use flock(2) on it to block other incarnations of themselves.
 630          * The rename means that everything is unlocked, as the original file
 631          * can no longer be accessed.
 632          */
 633         (void)snprintf(buf, sizeof(buf), "%s/%s", prefix, _MASTERPASSWD);
 634         mv(pname, buf);
 635
 636         /*
 637          * Close locked password file after rename()
 638          */
 639         if (fclose(fp) == EOF)
 640                 error("close fp");
 641
 642         exit(0);
 643 }
 644
 645 int
 646 scan(FILE *fp, struct passwd *pw)
 647 {
 648         static int lcnt;
 649         size_t len;
 650         char *p;
 651
 652         p = fgetln(fp, &len);
 653         if (p == NULL)
 654                 return (0);
 655         ++lcnt;
 656         /*
 657          * ``... if I swallow anything evil, put your fingers down my
 658          * throat...''
 659          *      -- The Who
 660          */
 661         if (len > 0 && p[len - 1] == '\n')
 662                 len--;
 663         if (len >= sizeof(line) - 1) {
 664                 warnx("line #%d too long", lcnt);
 665                 goto fmt;
 666         }
 667         memcpy(line, p, len);
 668         line[len] = '\0';
 669
 670         /*
 671          * Ignore comments: ^[ \t]*#
 672          */
 673         for (p = line; *p != '\0'; p++)
 674                 if (*p != ' ' && *p != '\t')
 675                         break;
 676         if (*p == '#' || *p == '\0') {
 677                 is_comment = 1;
 678                 return(1);
 679         } else
 680                 is_comment = 0;
 681
 682         if (!__pw_scan(line, pw, _PWSCAN_WARN|_PWSCAN_MASTER)) {
 683                 warnx("at line #%d", lcnt);
 684 fmt:            errno = EFTYPE; /* XXX */
 685                 error(pname);
 686         }
 687
 688         return (1);
 689 }
 690
 691 void
 692 cp(char *from, char *to, mode_t mode)
 693 {
 694         static char buf[MAXBSIZE];
 695         int from_fd, rcount, to_fd, wcount;
 696
 697         if ((from_fd = open(from, O_RDONLY, 0)) < 0)
 698                 error(from);
 699         if ((to_fd = open(to, O_WRONLY|O_CREAT|O_EXCL, mode)) < 0)
 700                 error(to);
 701         while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
 702                 wcount = write(to_fd, buf, rcount);
 703                 if (rcount != wcount || wcount == -1) {
 704                         int sverrno = errno;
 705
 706                         (void)snprintf(buf, sizeof(buf), "%s to %s", from, to);
 707                         errno = sverrno;
 708                         error(buf);
 709                 }
 710         }
 711         if (rcount < 0) {
 712                 int sverrno = errno;
 713
 714                 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to);
 715                 errno = sverrno;
 716                 error(buf);
 717         }
 718 }
 719
 720
 721 void
 722 mv(char *from, char *to)
 723 {
 724         char buf[MAXPATHLEN];
 725         char *to_dir;
 726         int to_dir_fd = -1;
 727
 728         /*
 729          * Make sure file is safe on disk. To improve performance we will call
 730          * fsync() to the directory where file lies
 731          */
 732         if (rename(from, to) != 0 ||
 733             (to_dir = dirname(to)) == NULL ||
 734             (to_dir_fd = open(to_dir, O_RDONLY|O_DIRECTORY)) == -1 ||
 735             fsync(to_dir_fd) != 0) {
 736                 int sverrno = errno;
 737                 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to);
 738                 errno = sverrno;
 739                 if (to_dir_fd != -1)
 740                         close(to_dir_fd);
 741                 error(buf);
 742         }
 743
 744         if (to_dir_fd != -1)
 745                 close(to_dir_fd);
 746 }
 747
 748 void
 749 error(const char *name)
 750 {
 751
 752         warn("%s", name);
 753         cleanup();
 754         exit(1);
 755 }
 756
 757 void
 758 cleanup(void)
 759 {
 760         char buf[MAXPATHLEN];
 761
 762         switch(clean) {
 763         case FILE_ORIG:
 764                 (void)snprintf(buf, sizeof(buf), "%s.orig", pname);
 765                 (void)unlink(buf);
 766                 /* FALLTHROUGH */
 767         case FILE_SECURE:
 768                 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB);
 769                 (void)unlink(buf);
 770                 /* FALLTHROUGH */
 771         case FILE_INSECURE:
 772                 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB);
 773                 (void)unlink(buf);
 774         }
 775 }
 776
 777 static void
 778 usage(void)
 779 {
 780
 781         (void)fprintf(stderr,
 782 "usage: pwd_mkdb [-BCiLNp] [-d directory] [-s cachesize] [-u username] file\n");
 783         exit(1);
 784 }