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  * $DragonFly: src/usr.sbin/pwd_mkdb/pwd_mkdb.c,v 1.5 2005/12/05 02:40:27 swildner Exp $
  33  */
  34
  35 #include <sys/param.h>
  36 #include <sys/endian.h>
  37 #include <sys/stat.h>
  38 #include <arpa/inet.h>
  39
  40 #include <db.h>
  41 #include <err.h>
  42 #include <errno.h>
  43 #include <fcntl.h>
  44 #include <limits.h>
  45 #include <pwd.h>
  46 #include <signal.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51
  52 #include "pw_scan.h"
  53
  54 #define INSECURE        1
  55 #define SECURE          2
  56 #define PERM_INSECURE   (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)
  57 #define PERM_SECURE     (S_IRUSR|S_IWUSR)
  58 #define LEGACY_VERSION(x)  _PW_VERSIONED(x, 3)
  59 #define CURRENT_VERSION(x) _PW_VERSIONED(x, 4)
  60
  61 HASHINFO openinfo = {
  62         4096,           /* bsize */
  63         32,             /* ffactor */
  64         256,            /* nelem */
  65         2048 * 1024,    /* cachesize */
  66         NULL,           /* hash() */
  67         BYTE_ORDER      /* lorder */
  68 };
  69
  70 static enum state { FILE_INSECURE, FILE_SECURE, FILE_ORIG } clean;
  71 static struct passwd pwd;                       /* password structure */
  72 static char *pname;                             /* password file name */
  73 static char prefix[MAXPATHLEN];
  74
  75 static int is_comment;  /* flag for comments */
  76 static char line[LINE_MAX];
  77
  78 void    cleanup(void);
  79 void    error(const char *);
  80 void    cp(char *, char *, mode_t mode);
  81 void    mv(char *, char *);
  82 int     scan(FILE *, struct passwd *);
  83 static void     usage(void);
  84
  85 int
  86 main(int argc, char *argv[])
  87 {
  88         static char verskey[] = _PWD_VERSION_KEY;
  89         char version = _PWD_CURRENT_VERSION;
  90         DB *dp, *sdp, *pw_db;
  91         DBT data, sdata, key;
  92         FILE *fp, *oldfp;
  93         sigset_t set;
  94         int ch, cnt, ypcnt, makeold, tfd, yp_enabled = 0;
  95         unsigned int len;
  96         uint32_t store;
  97         const char *t;
  98         char *p;
  99         char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], tbuf[1024];
 100         char sbuf[MAX(MAXPATHLEN, LINE_MAX * 2)];
 101         char buf2[MAXPATHLEN];
 102         char sbuf2[MAXPATHLEN];
 103         char *username;
 104         u_int method, methoduid;
 105         int Cflag, dflag, iflag;
 106         int nblock = 0;
 107
 108         iflag = dflag = Cflag = 0;
 109         strcpy(prefix, _PATH_PWD);
 110         makeold = 0;
 111         username = NULL;
 112         oldfp = NULL;
 113         while ((ch = getopt(argc, argv, "BCLNd:ips:u:v")) != -1)
 114                 switch(ch) {
 115                 case 'B':                       /* big-endian output */
 116                         openinfo.lorder = BIG_ENDIAN;
 117                         break;
 118                 case 'C':                       /* verify only */
 119                         Cflag = 1;
 120                         break;
 121                 case 'L':                       /* little-endian output */
 122                         openinfo.lorder = LITTLE_ENDIAN;
 123                         break;
 124                 case 'N':                       /* do not wait for lock */
 125                         nblock = LOCK_NB;       /* will fail if locked */
 126                         break;
 127                 case 'd':
 128                         dflag++;
 129                         strlcpy(prefix, optarg, sizeof(prefix));
 130                         break;
 131                 case 'i':
 132                         iflag++;
 133                         break;
 134                 case 'p':                       /* create V7 "file.orig" */
 135                         makeold = 1;
 136                         break;
 137                 case 's':                       /* change default cachesize */
 138                         openinfo.cachesize = atoi(optarg) * 1024 * 1024;
 139                         break;
 140                 case 'u':                       /* only update this record */
 141                         username = optarg;
 142                         break;
 143                 case 'v':                       /* backward compatible */
 144                         break;
 145                 default:
 146                         usage();
 147                 }
 148         argc -= optind;
 149         argv += optind;
 150
 151         if (argc != 1 || (username && (*username == '+' || *username == '-')))
 152                 usage();
 153
 154         /*
 155          * This could be changed to allow the user to interrupt.
 156          * Probably not worth the effort.
 157          */
 158         sigemptyset(&set);
 159         sigaddset(&set, SIGTSTP);
 160         sigaddset(&set, SIGHUP);
 161         sigaddset(&set, SIGINT);
 162         sigaddset(&set, SIGQUIT);
 163         sigaddset(&set, SIGTERM);
 164         sigprocmask(SIG_BLOCK, &set, NULL);
 165
 166         /* We don't care what the user wants. */
 167         umask(0);
 168
 169         pname = *argv;
 170
 171         /*
 172          * Open and lock the original password file.  We have to check
 173          * the hardlink count after we get the lock to handle any potential
 174          * unlink/rename race.
 175          *
 176          * This lock is necessary when someone runs pwd_mkdb manually, directly
 177          * on master.passwd, to handle the case where a user might try to
 178          * change his password while pwd_mkdb is running.
 179          */
 180         for (;;) {
 181                 struct stat st;
 182
 183                 if (!(fp = fopen(pname, "r")))
 184                         error(pname);
 185                 if (flock(fileno(fp), LOCK_EX|nblock) < 0 && !(dflag && iflag))
 186                         error("flock");
 187                 if (fstat(fileno(fp), &st) < 0)
 188                         error(pname);
 189                 if (st.st_nlink != 0)
 190                         break;
 191                 fclose(fp);
 192                 fp = NULL;
 193         }
 194
 195         /* check only if password database is valid */
 196         if (Cflag) {
 197                 for (cnt = 1; scan(fp, &pwd); ++cnt);
 198                 exit(0);
 199         }
 200
 201         /* Open the temporary insecure password database. */
 202         snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB);
 203         snprintf(sbuf, sizeof(sbuf), "%s/%s.tmp", prefix, _SMP_DB);
 204         if (username) {
 205                 int use_version;
 206
 207                 snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB);
 208                 snprintf(sbuf2, sizeof(sbuf2), "%s/%s", prefix, _SMP_DB);
 209
 210                 clean = FILE_INSECURE;
 211                 cp(buf2, buf, PERM_INSECURE);
 212                 dp = dbopen(buf,
 213                     O_RDWR|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo);
 214                 if (dp == NULL)
 215                         error(buf);
 216
 217                 clean = FILE_SECURE;
 218                 cp(sbuf2, sbuf, PERM_SECURE);
 219                 sdp = dbopen(sbuf,
 220                     O_RDWR|O_EXCL, PERM_SECURE, DB_HASH, &openinfo);
 221                 if (sdp == NULL)
 222                         error(sbuf);
 223
 224                 /*
 225                  * Do some trouble to check if we should store this users
 226                  * uid. Don't use getpwnam/getpwuid as that interferes
 227                  * with NIS.
 228                  */
 229                 pw_db = dbopen(_PATH_MP_DB, O_RDONLY, 0, DB_HASH, NULL);
 230                 if (!pw_db)
 231                         error(_MP_DB);
 232
 233                 key.data = verskey;
 234                 key.size = sizeof(verskey)-1;
 235                 if ((pw_db->get)(pw_db, &key, &data, 0) == 0)
 236                         use_version = *(unsigned char *)data.data;
 237                 else
 238                         use_version = 3;
 239                 buf[0] = _PW_VERSIONED(_PW_KEYBYNAME, use_version);
 240                 len = strlen(username);
 241
 242                 /* Only check that username fits in buffer */
 243                 memmove(buf + 1, username, MIN(len, sizeof(buf) - 1));
 244                 key.data = (u_char *)buf;
 245                 key.size = len + 1;
 246                 if ((pw_db->get)(pw_db, &key, &data, 0) == 0) {
 247                         p = (char *)data.data;
 248
 249                         /* jump over pw_name and pw_passwd, to get to pw_uid */
 250                         while (*p++)
 251                                 ;
 252                         while (*p++)
 253                                 ;
 254
 255                         buf[0] = _PW_VERSIONED(_PW_KEYBYUID, use_version);
 256                         memmove(buf + 1, p, sizeof(store));
 257                         key.data = (u_char *)buf;
 258                         key.size = sizeof(store) + 1;
 259
 260                         if ((pw_db->get)(pw_db, &key, &data, 0) == 0) {
 261                                 /* First field of data.data holds pw_pwname */
 262                                 if (!strcmp(data.data, username))
 263                                         methoduid = 0;
 264                                 else
 265                                         methoduid = R_NOOVERWRITE;
 266                         } else {
 267                                 methoduid = R_NOOVERWRITE;
 268                         }
 269                 } else {
 270                         methoduid = R_NOOVERWRITE;
 271                 }
 272                 if ((pw_db->close)(pw_db))
 273                         error("close pw_db");
 274                 method = 0;
 275         } else {
 276                 dp = dbopen(buf,
 277                     O_RDWR|O_CREAT|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo);
 278                 if (dp == NULL)
 279                         error(buf);
 280                 clean = FILE_INSECURE;
 281
 282                 sdp = dbopen(sbuf,
 283                     O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo);
 284                 if (sdp == NULL)
 285                         error(sbuf);
 286                 clean = FILE_SECURE;
 287
 288                 method = R_NOOVERWRITE;
 289                 methoduid = R_NOOVERWRITE;
 290         }
 291
 292         /*
 293          * Open file for old password file.  Minor trickiness -- don't want to
 294          * chance the file already existing, since someone (stupidly) might
 295          * still be using this for permission checking.  So, open it first and
 296          * fdopen the resulting fd.  The resulting file should be readable by
 297          * everyone.
 298          */
 299         if (makeold) {
 300                 snprintf(buf, sizeof(buf), "%s.orig", pname);
 301                 if ((tfd = open(buf,
 302                     O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0)
 303                         error(buf);
 304                 if ((oldfp = fdopen(tfd, "w")) == NULL)
 305                         error(buf);
 306                 clean = FILE_ORIG;
 307         }
 308
 309         /*
 310          * The databases actually contain three copies of the original data.
 311          * Each password file entry is converted into a rough approximation
 312          * of a ``struct passwd'', with the strings placed inline.  This
 313          * object is then stored as the data for three separate keys.  The
 314          * first key * is the pw_name field prepended by the _PW_KEYBYNAME
 315          * character.  The second key is the pw_uid field prepended by the
 316          * _PW_KEYBYUID character.  The third key is the line number in the
 317          * original file prepended by the _PW_KEYBYNUM character.  (The special
 318          * characters are prepended to ensure that the keys do not collide.)
 319          */
 320         /* In order to transition this file into a machine-independent
 321          * form, we have to change the format of entries.  However, since
 322          * older binaries will still expect the old MD format entries, we
 323          * create those as usual and use versioned tags for the new entries.
 324          */
 325         if (username == NULL) {
 326                 /* Do not add the VERSION tag when updating a single
 327                  * user.  When operating on `old format' databases, this
 328                  * would result in applications `seeing' only the updated
 329                  * entries.
 330                  */
 331                 key.data = verskey;
 332                 key.size = sizeof(verskey)-1;
 333                 data.data = &version;
 334                 data.size = 1;
 335                 if ((dp->put)(dp, &key, &data, 0) == -1)
 336                         error("put");
 337                 if ((dp->put)(sdp, &key, &data, 0) == -1)
 338                         error("put");
 339         }
 340         ypcnt = 1;
 341         data.data = (u_char *)buf;
 342         sdata.data = (u_char *)sbuf;
 343         key.data = (u_char *)tbuf;
 344         for (cnt = 1; scan(fp, &pwd); ++cnt) {
 345                 if (!is_comment &&
 346                     (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-'))
 347                         yp_enabled = 1;
 348                 if (is_comment)
 349                         --cnt;
 350 #define COMPACT(e)      t = e; while ((*p++ = *t++));
 351 #define SCALAR(e)       store = htonl((uint32_t)(e));      \
 352                         memmove(p, &store, sizeof(store)); \
 353                         p += sizeof(store);
 354 #define LSCALAR(e)      store = HTOL((uint32_t)(e));       \
 355                         memmove(p, &store, sizeof(store)); \
 356                         p += sizeof(store);
 357 #define HTOL(e)         (openinfo.lorder == BYTE_ORDER ? \
 358                         (uint32_t)(e) : \
 359                         bswap32((uint32_t)(e)))
 360                 if (!is_comment &&
 361                     (!username || (strcmp(username, pwd.pw_name) == 0))) {
 362                         /* Create insecure data. */
 363                         p = buf;
 364                         COMPACT(pwd.pw_name);
 365                         COMPACT("*");
 366                         SCALAR(pwd.pw_uid);
 367                         SCALAR(pwd.pw_gid);
 368                         SCALAR(pwd.pw_change);
 369                         COMPACT(pwd.pw_class);
 370                         COMPACT(pwd.pw_gecos);
 371                         COMPACT(pwd.pw_dir);
 372                         COMPACT(pwd.pw_shell);
 373                         SCALAR(pwd.pw_expire);
 374                         SCALAR(pwd.pw_fields);
 375                         data.size = p - buf;
 376
 377                         /* Create secure data. */
 378                         p = sbuf;
 379                         COMPACT(pwd.pw_name);
 380                         COMPACT(pwd.pw_passwd);
 381                         SCALAR(pwd.pw_uid);
 382                         SCALAR(pwd.pw_gid);
 383                         SCALAR(pwd.pw_change);
 384                         COMPACT(pwd.pw_class);
 385                         COMPACT(pwd.pw_gecos);
 386                         COMPACT(pwd.pw_dir);
 387                         COMPACT(pwd.pw_shell);
 388                         SCALAR(pwd.pw_expire);
 389                         SCALAR(pwd.pw_fields);
 390                         sdata.size = p - sbuf;
 391
 392                         /* Store insecure by name. */
 393                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYNAME);
 394                         len = strlen(pwd.pw_name);
 395                         memmove(tbuf + 1, pwd.pw_name, len);
 396                         key.size = len + 1;
 397                         if ((dp->put)(dp, &key, &data, method) == -1)
 398                                 error("put");
 399
 400                         /* Store insecure by number. */
 401                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYNUM);
 402                         store = htonl(cnt);
 403                         memmove(tbuf + 1, &store, sizeof(store));
 404                         key.size = sizeof(store) + 1;
 405                         if ((dp->put)(dp, &key, &data, method) == -1)
 406                                 error("put");
 407
 408                         /* Store insecure by uid. */
 409                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYUID);
 410                         store = htonl(pwd.pw_uid);
 411                         memmove(tbuf + 1, &store, sizeof(store));
 412                         key.size = sizeof(store) + 1;
 413                         if ((dp->put)(dp, &key, &data, methoduid) == -1)
 414                                 error("put");
 415
 416                         /* Store secure by name. */
 417                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYNAME);
 418                         len = strlen(pwd.pw_name);
 419                         memmove(tbuf + 1, pwd.pw_name, len);
 420                         key.size = len + 1;
 421                         if ((sdp->put)(sdp, &key, &sdata, method) == -1)
 422                                 error("put");
 423
 424                         /* Store secure by number. */
 425                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYNUM);
 426                         store = htonl(cnt);
 427                         memmove(tbuf + 1, &store, sizeof(store));
 428                         key.size = sizeof(store) + 1;
 429                         if ((sdp->put)(sdp, &key, &sdata, method) == -1)
 430                                 error("put");
 431
 432                         /* Store secure by uid. */
 433                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYUID);
 434                         store = htonl(pwd.pw_uid);
 435                         memmove(tbuf + 1, &store, sizeof(store));
 436                         key.size = sizeof(store) + 1;
 437                         if ((sdp->put)(sdp, &key, &sdata, methoduid) == -1)
 438                                 error("put");
 439
 440                         /* Store insecure and secure special plus and special minus */
 441                         if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') {
 442                                 tbuf[0] = CURRENT_VERSION(_PW_KEYYPBYNUM);
 443                                 store = htonl(ypcnt);
 444                                 memmove(tbuf + 1, &store, sizeof(store));
 445                                 ypcnt++;
 446                                 key.size = sizeof(store) + 1;
 447                                 if ((dp->put)(dp, &key, &data, method) == -1)
 448                                         error("put");
 449                                 if ((sdp->put)(sdp, &key, &sdata, method) == -1)
 450                                         error("put");
 451                         }
 452
 453                         /* Create insecure data. (legacy version) */
 454                         p = buf;
 455                         COMPACT(pwd.pw_name);
 456                         COMPACT("*");
 457                         LSCALAR(pwd.pw_uid);
 458                         LSCALAR(pwd.pw_gid);
 459                         LSCALAR(pwd.pw_change);
 460                         COMPACT(pwd.pw_class);
 461                         COMPACT(pwd.pw_gecos);
 462                         COMPACT(pwd.pw_dir);
 463                         COMPACT(pwd.pw_shell);
 464                         LSCALAR(pwd.pw_expire);
 465                         LSCALAR(pwd.pw_fields);
 466                         data.size = p - buf;
 467
 468                         /* Create secure data. (legacy version) */
 469                         p = sbuf;
 470                         COMPACT(pwd.pw_name);
 471                         COMPACT(pwd.pw_passwd);
 472                         LSCALAR(pwd.pw_uid);
 473                         LSCALAR(pwd.pw_gid);
 474                         LSCALAR(pwd.pw_change);
 475                         COMPACT(pwd.pw_class);
 476                         COMPACT(pwd.pw_gecos);
 477                         COMPACT(pwd.pw_dir);
 478                         COMPACT(pwd.pw_shell);
 479                         LSCALAR(pwd.pw_expire);
 480                         LSCALAR(pwd.pw_fields);
 481                         sdata.size = p - sbuf;
 482
 483                         /* Store insecure by name. */
 484                         tbuf[0] = LEGACY_VERSION(_PW_KEYBYNAME);
 485                         len = strlen(pwd.pw_name);
 486                         memmove(tbuf + 1, pwd.pw_name, len);
 487                         key.size = len + 1;
 488                         if ((dp->put)(dp, &key, &data, method) == -1)
 489                                 error("put");
 490
 491                         /* Store insecure by number. */
 492                         tbuf[0] = LEGACY_VERSION(_PW_KEYBYNUM);
 493                         store = HTOL(cnt);
 494                         memmove(tbuf + 1, &store, sizeof(store));
 495                         key.size = sizeof(store) + 1;
 496                         if ((dp->put)(dp, &key, &data, method) == -1)
 497                                 error("put");
 498
 499                         /* Store insecure by uid. */
 500                         tbuf[0] = LEGACY_VERSION(_PW_KEYBYUID);
 501                         store = HTOL(pwd.pw_uid);
 502                         memmove(tbuf + 1, &store, sizeof(store));
 503                         key.size = sizeof(store) + 1;
 504                         if ((dp->put)(dp, &key, &data, methoduid) == -1)
 505                                 error("put");
 506
 507                         /* Store secure by name. */
 508                         tbuf[0] = LEGACY_VERSION(_PW_KEYBYNAME);
 509                         len = strlen(pwd.pw_name);
 510                         memmove(tbuf + 1, pwd.pw_name, len);
 511                         key.size = len + 1;
 512                         if ((sdp->put)(sdp, &key, &sdata, method) == -1)
 513                                 error("put");
 514
 515                         /* Store secure by number. */
 516                         tbuf[0] = LEGACY_VERSION(_PW_KEYBYNUM);
 517                         store = HTOL(cnt);
 518                         memmove(tbuf + 1, &store, sizeof(store));
 519                         key.size = sizeof(store) + 1;
 520                         if ((sdp->put)(sdp, &key, &sdata, method) == -1)
 521                                 error("put");
 522
 523                         /* Store secure by uid. */
 524                         tbuf[0] = LEGACY_VERSION(_PW_KEYBYUID);
 525                         store = HTOL(pwd.pw_uid);
 526                         memmove(tbuf + 1, &store, sizeof(store));
 527                         key.size = sizeof(store) + 1;
 528                         if ((sdp->put)(sdp, &key, &sdata, methoduid) == -1)
 529                                 error("put");
 530
 531                         /* Store insecure and secure special plus and special minus */
 532                         if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') {
 533                                 tbuf[0] = LEGACY_VERSION(_PW_KEYYPBYNUM);
 534                                 store = HTOL(ypcnt);
 535                                 memmove(tbuf + 1, &store, sizeof(store));
 536                                 ypcnt++;
 537                                 key.size = sizeof(store) + 1;
 538                                 if ((dp->put)(dp, &key, &data, method) == -1)
 539                                         error("put");
 540                                 if ((sdp->put)(sdp, &key, &sdata, method) == -1)
 541                                         error("put");
 542                         }
 543                 }
 544                 /* Create original format password file entry */
 545                 if (is_comment && makeold){     /* copy comments */
 546                         if (fprintf(oldfp, "%s\n", line) < 0)
 547                                 error("write old");
 548                 } else if (makeold) {
 549                         char uidstr[20];
 550                         char gidstr[20];
 551
 552                         snprintf(uidstr, sizeof(uidstr), "%u", pwd.pw_uid);
 553                         snprintf(gidstr, sizeof(gidstr), "%u", pwd.pw_gid);
 554
 555                         if (fprintf(oldfp, "%s:*:%s:%s:%s:%s:%s\n",
 556                             pwd.pw_name, pwd.pw_fields & _PWF_UID ? uidstr : "",
 557                             pwd.pw_fields & _PWF_GID ? gidstr : "",
 558                             pwd.pw_gecos, pwd.pw_dir, pwd.pw_shell) < 0)
 559                                 error("write old");
 560                 }
 561         }
 562         /* If YP enabled, set flag. */
 563         if (yp_enabled) {
 564                 buf[0] = yp_enabled + 2;
 565                 data.size = 1;
 566                 key.size = 1;
 567                 tbuf[0] = CURRENT_VERSION(_PW_KEYYPENABLED);
 568                 if ((dp->put)(dp, &key, &data, method) == -1)
 569                         error("put");
 570                 if ((sdp->put)(sdp, &key, &data, method) == -1)
 571                         error("put");
 572                 tbuf[0] = LEGACY_VERSION(_PW_KEYYPENABLED);
 573                 key.size = 1;
 574                 if ((dp->put)(dp, &key, &data, method) == -1)
 575                         error("put");
 576                 if ((sdp->put)(sdp, &key, &data, method) == -1)
 577                         error("put");
 578         }
 579
 580         if ((dp->close)(dp) == -1)
 581                 error("close");
 582         if ((sdp->close)(sdp) == -1)
 583                 error("close");
 584         if (makeold) {
 585                 fflush(oldfp);
 586                 if (fclose(oldfp) == EOF)
 587                         error("close old");
 588         }
 589
 590         /* Set master.passwd permissions, in case caller forgot. */
 591         fchmod(fileno(fp), S_IRUSR|S_IWUSR);
 592
 593         /* Install as the real password files. */
 594         snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB);
 595         snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB);
 596         mv(buf, buf2);
 597         snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB);
 598         snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _SMP_DB);
 599         mv(buf, buf2);
 600         if (makeold) {
 601                 snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _PASSWD);
 602                 snprintf(buf, sizeof(buf), "%s.orig", pname);
 603                 mv(buf, buf2);
 604         }
 605         /*
 606          * Move the master password LAST -- chpass(1), passwd(1) and vipw(8)
 607          * all use flock(2) on it to block other incarnations of themselves.
 608          * The rename means that everything is unlocked, as the original file
 609          * can no longer be accessed.
 610          */
 611         snprintf(buf, sizeof(buf), "%s/%s", prefix, _MASTERPASSWD);
 612         mv(pname, buf);
 613
 614         /*
 615          * Close locked password file after rename()
 616          */
 617         if (fclose(fp) == EOF)
 618                 error("close fp");
 619
 620         exit(0);
 621 }
 622
 623 int
 624 scan(FILE *fp, struct passwd *pw)
 625 {
 626         static int lcnt;
 627         size_t len;
 628         char *p;
 629
 630         p = fgetln(fp, &len);
 631         if (p == NULL)
 632                 return (0);
 633         ++lcnt;
 634         /*
 635          * ``... if I swallow anything evil, put your fingers down my
 636          * throat...''
 637          *      -- The Who
 638          */
 639         if (len > 0 && p[len - 1] == '\n')
 640                 len--;
 641         if (len >= sizeof(line) - 1) {
 642                 warnx("line #%d too long", lcnt);
 643                 goto fmt;
 644         }
 645         memcpy(line, p, len);
 646         line[len] = '\0';
 647
 648         /*
 649          * Ignore comments: ^[ \t]*#
 650          */
 651         for (p = line; *p != '\0'; p++)
 652                 if (*p != ' ' && *p != '\t')
 653                         break;
 654         if (*p == '#' || *p == '\0') {
 655                 is_comment = 1;
 656                 return(1);
 657         } else
 658                 is_comment = 0;
 659
 660         if (!__pw_scan(line, pw, _PWSCAN_WARN|_PWSCAN_MASTER)) {
 661                 warnx("at line #%d", lcnt);
 662 fmt:            errno = EFTYPE; /* XXX */
 663                 error(pname);
 664         }
 665
 666         return (1);
 667 }
 668
 669 void
 670 cp(char *from, char *to, mode_t mode)
 671 {
 672         static char buf[MAXBSIZE];
 673         int from_fd, rcount, to_fd, wcount;
 674
 675         if ((from_fd = open(from, O_RDONLY, 0)) < 0)
 676                 error(from);
 677         if ((to_fd = open(to, O_WRONLY|O_CREAT|O_EXCL, mode)) < 0)
 678                 error(to);
 679         while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
 680                 wcount = write(to_fd, buf, rcount);
 681                 if (rcount != wcount || wcount == -1) {
 682                         int sverrno = errno;
 683
 684                         snprintf(buf, sizeof(buf), "%s to %s", from, to);
 685                         errno = sverrno;
 686                         error(buf);
 687                 }
 688         }
 689         if (rcount < 0) {
 690                 int sverrno = errno;
 691
 692                 snprintf(buf, sizeof(buf), "%s to %s", from, to);
 693                 errno = sverrno;
 694                 error(buf);
 695         }
 696 }
 697
 698
 699 void
 700 mv(char *from, char *to)
 701 {
 702         char buf[MAXPATHLEN];
 703
 704         if (rename(from, to)) {
 705                 int sverrno = errno;
 706                 snprintf(buf, sizeof(buf), "%s to %s", from, to);
 707                 errno = sverrno;
 708                 error(buf);
 709         }
 710 }
 711
 712 void
 713 error(const char *name)
 714 {
 715
 716         warn("%s", name);
 717         cleanup();
 718         exit(1);
 719 }
 720
 721 void
 722 cleanup(void)
 723 {
 724         char buf[MAXPATHLEN];
 725
 726         switch(clean) {
 727         case FILE_ORIG:
 728                 snprintf(buf, sizeof(buf), "%s.orig", pname);
 729                 unlink(buf);
 730                 /* FALLTHROUGH */
 731         case FILE_SECURE:
 732                 snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB);
 733                 unlink(buf);
 734                 /* FALLTHROUGH */
 735         case FILE_INSECURE:
 736                 snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB);
 737                 unlink(buf);
 738         }
 739 }
 740
 741 static void
 742 usage(void)
 743 {
 744
 745         fprintf(stderr,
 746 "usage: pwd_mkdb [-BCiLNp] [-d directory] [-s cachesize] [-u username] file\n");
 747         exit(1);
 748 }