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1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1991, 1993, 1994
5  *      The Regents of the University of California.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. Neither the name of the University nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  */
31
32 #if 0
33 #ifndef lint
34 static const char copyright[] =
35 "@(#) Copyright (c) 1991, 1993, 1994\n\
36         The Regents of the University of California.  All rights reserved.\n";
37 #endif /* not lint */
38
39 #ifndef lint
40 static char sccsid[] = "@(#)pwd_mkdb.c  8.5 (Berkeley) 4/20/94";
41 #endif /* not lint */
42 #endif
43
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD$");
46
47 #include <sys/param.h>
48 #include <sys/endian.h>
49 #include <sys/stat.h>
50 #include <arpa/inet.h>
51
52 #include <db.h>
53 #include <err.h>
54 #include <errno.h>
55 #include <fcntl.h>
56 #include <libgen.h>
57 #include <limits.h>
58 #include <pwd.h>
59 #include <signal.h>
60 #include <stdio.h>
61 #include <stdlib.h>
62 #include <string.h>
63 #include <unistd.h>
64
65 #include "pw_scan.h"
66
67 #define INSECURE        1
68 #define SECURE          2
69 #define PERM_INSECURE   (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)
70 #define PERM_SECURE     (S_IRUSR|S_IWUSR)
71 #define LEGACY_VERSION(x)  _PW_VERSIONED(x, 3)
72 #define CURRENT_VERSION(x) _PW_VERSIONED(x, 4)
73
74 static HASHINFO openinfo = {
75         4096,           /* bsize */
76         32,             /* ffactor */
77         256,            /* nelem */
78         2048 * 1024,    /* cachesize */
79         NULL,           /* hash() */
80         BYTE_ORDER      /* lorder */
81 };
82
83 static enum state { FILE_INSECURE, FILE_SECURE, FILE_ORIG } clean;
84 static struct passwd pwd;                       /* password structure */
85 static char *pname;                             /* password file name */
86 static char prefix[MAXPATHLEN];
87
88 static int is_comment;  /* flag for comments */
89 static char line[LINE_MAX];
90
91 void    cleanup(void);
92 void    error(const char *);
93 void    cp(char *, char *, mode_t mode);
94 void    mv(char *, char *);
95 int     scan(FILE *, struct passwd *);
96 static void     usage(void);
97
98 int
99 main(int argc, char *argv[])
100 {
101         static char verskey[] = _PWD_VERSION_KEY;
102         char version = _PWD_CURRENT_VERSION;
103         DB *dp, *sdp, *pw_db;
104         DBT data, sdata, key;
105         FILE *fp, *oldfp;
106         sigset_t set;
107         int ch, cnt, ypcnt, makeold, tfd, yp_enabled = 0;
108         unsigned int len;
109         uint32_t store;
110         const char *t;
111         char *p;
112         char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], tbuf[1024];
113         char sbuf[MAX(MAXPATHLEN, LINE_MAX * 2)];
114         char buf2[MAXPATHLEN];
115         char sbuf2[MAXPATHLEN];
116         char *username;
117         u_int method, methoduid;
118         int Cflag, dflag, iflag, lflag;
119         int nblock = 0;
120
121         iflag = dflag = Cflag = lflag = 0;
122         strcpy(prefix, _PATH_PWD);
123         makeold = 0;
124         username = NULL;
125         oldfp = NULL;
126         while ((ch = getopt(argc, argv, "BCLlNd:ips:u:v")) != -1)
127                 switch(ch) {
128                 case 'B':                       /* big-endian output */
129                         openinfo.lorder = BIG_ENDIAN;
130                         break;
131                 case 'C':                       /* verify only */
132                         Cflag = 1;
133                         break;
134                 case 'l':                       /* generate legacy entries */
135                         lflag = 1;
136                         break;
137                 case 'L':                       /* little-endian output */
138                         openinfo.lorder = LITTLE_ENDIAN;
139                         break;
140                 case 'N':                       /* do not wait for lock */
141                         nblock = LOCK_NB;       /* will fail if locked */
142                         break;
143                 case 'd':
144                         dflag++;
145                         strlcpy(prefix, optarg, sizeof(prefix));
146                         break;
147                 case 'i':
148                         iflag++;
149                         break;
150                 case 'p':                       /* create V7 "file.orig" */
151                         makeold = 1;
152                         break;
153                 case 's':                       /* change default cachesize */
154                         openinfo.cachesize = atoi(optarg) * 1024 * 1024;
155                         break;
156                 case 'u':                       /* only update this record */
157                         username = optarg;
158                         break;
159                 case 'v':                       /* backward compatible */
160                         break;
161                 default:
162                         usage();
163                 }
164         argc -= optind;
165         argv += optind;
166
167         if (argc != 1 || (username && (*username == '+' || *username == '-')))
168                 usage();
169         if (lflag)
170                 warnx("legacy (v3) database format support is deprecated");
171
172         /*
173          * This could be changed to allow the user to interrupt.
174          * Probably not worth the effort.
175          */
176         sigemptyset(&set);
177         sigaddset(&set, SIGTSTP);
178         sigaddset(&set, SIGHUP);
179         sigaddset(&set, SIGINT);
180         sigaddset(&set, SIGQUIT);
181         sigaddset(&set, SIGTERM);
182         (void)sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL);
183
184         /* We don't care what the user wants. */
185         (void)umask(0);
186
187         pname = *argv;
188
189         /*
190          * Open and lock the original password file.  We have to check
191          * the hardlink count after we get the lock to handle any potential
192          * unlink/rename race.
193          *
194          * This lock is necessary when someone runs pwd_mkdb manually, directly
195          * on master.passwd, to handle the case where a user might try to
196          * change his password while pwd_mkdb is running. 
197          */
198         for (;;) {
199                 struct stat st;
200
201                 if (!(fp = fopen(pname, "r")))
202                         error(pname);
203                 if (flock(fileno(fp), LOCK_EX|nblock) < 0 && !(dflag && iflag))
204                         error("flock");
205                 if (fstat(fileno(fp), &st) < 0)
206                         error(pname);
207                 if (st.st_nlink != 0)
208                         break;
209                 fclose(fp);
210                 fp = NULL;
211         }
212
213         /* check only if password database is valid */
214         if (Cflag) {
215                 while (scan(fp, &pwd))
216                         if (!is_comment && strlen(pwd.pw_name) >= MAXLOGNAME) {
217                                 warnx("%s: username too long", pwd.pw_name);
218                                 exit(1);
219                         }
220                 exit(0);
221         }
222
223         /* Open the temporary insecure password database. */
224         (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB);
225         (void)snprintf(sbuf, sizeof(sbuf), "%s/%s.tmp", prefix, _SMP_DB);
226         if (username) {
227                 int use_version;
228
229                 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB);
230                 (void)snprintf(sbuf2, sizeof(sbuf2), "%s/%s", prefix, _SMP_DB);
231
232                 clean = FILE_INSECURE;
233                 cp(buf2, buf, PERM_INSECURE);
234                 dp = dbopen(buf,
235                     O_RDWR|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo);
236                 if (dp == NULL)
237                         error(buf);
238
239                 clean = FILE_SECURE;
240                 cp(sbuf2, sbuf, PERM_SECURE);
241                 sdp = dbopen(sbuf,
242                     O_RDWR|O_EXCL, PERM_SECURE, DB_HASH, &openinfo);
243                 if (sdp == NULL)
244                         error(sbuf);
245
246                 /*
247                  * Do some trouble to check if we should store this users 
248                  * uid. Don't use getpwnam/getpwuid as that interferes 
249                  * with NIS.
250                  */
251                 pw_db = dbopen(_PATH_MP_DB, O_RDONLY, 0, DB_HASH, NULL);
252                 if (!pw_db)
253                         error(_MP_DB);
254
255                 key.data = verskey;
256                 key.size = sizeof(verskey)-1;
257                 if ((pw_db->get)(pw_db, &key, &data, 0) == 0)
258                         use_version = *(unsigned char *)data.data;
259                 else
260                         use_version = 3;
261                 buf[0] = _PW_VERSIONED(_PW_KEYBYNAME, use_version);
262                 len = strlen(username);
263
264                 /* Only check that username fits in buffer */
265                 memmove(buf + 1, username, MIN(len, sizeof(buf) - 1));
266                 key.data = (u_char *)buf;
267                 key.size = len + 1;
268                 if ((pw_db->get)(pw_db, &key, &data, 0) == 0) {
269                         p = (char *)data.data;
270
271                         /* jump over pw_name and pw_passwd, to get to pw_uid */
272                         while (*p++)
273                                 ;
274                         while (*p++)
275                                 ;
276
277                         buf[0] = _PW_VERSIONED(_PW_KEYBYUID, use_version);
278                         memmove(buf + 1, p, sizeof(store));
279                         key.data = (u_char *)buf;
280                         key.size = sizeof(store) + 1;
281
282                         if ((pw_db->get)(pw_db, &key, &data, 0) == 0) {
283                                 /* First field of data.data holds pw_pwname */
284                                 if (!strcmp(data.data, username))
285                                         methoduid = 0;
286                                 else
287                                         methoduid = R_NOOVERWRITE;
288                         } else {
289                                 methoduid = R_NOOVERWRITE;
290                         }
291                 } else {
292                         methoduid = R_NOOVERWRITE;
293                 }
294                 if ((pw_db->close)(pw_db))
295                         error("close pw_db");
296                 method = 0;
297         } else {
298                 dp = dbopen(buf,
299                     O_RDWR|O_CREAT|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo);
300                 if (dp == NULL)
301                         error(buf);
302                 clean = FILE_INSECURE;
303
304                 sdp = dbopen(sbuf,
305                     O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo);
306                 if (sdp == NULL)
307                         error(sbuf);
308                 clean = FILE_SECURE;
309
310                 method = R_NOOVERWRITE;
311                 methoduid = R_NOOVERWRITE;
312         }
313
314         /*
315          * Open file for old password file.  Minor trickiness -- don't want to
316          * chance the file already existing, since someone (stupidly) might
317          * still be using this for permission checking.  So, open it first and
318          * fdopen the resulting fd.  The resulting file should be readable by
319          * everyone.
320          */
321         if (makeold) {
322                 (void)snprintf(buf, sizeof(buf), "%s.orig", pname);
323                 if ((tfd = open(buf,
324                     O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0)
325                         error(buf);
326                 if ((oldfp = fdopen(tfd, "w")) == NULL)
327                         error(buf);
328                 clean = FILE_ORIG;
329         }
330
331         /*
332          * The databases actually contain three copies of the original data.
333          * Each password file entry is converted into a rough approximation
334          * of a ``struct passwd'', with the strings placed inline.  This
335          * object is then stored as the data for three separate keys.  The
336          * first key * is the pw_name field prepended by the _PW_KEYBYNAME
337          * character.  The second key is the pw_uid field prepended by the
338          * _PW_KEYBYUID character.  The third key is the line number in the
339          * original file prepended by the _PW_KEYBYNUM character.  (The special
340          * characters are prepended to ensure that the keys do not collide.)
341          */
342         /* In order to transition this file into a machine-independent
343          * form, we have to change the format of entries.  However, since
344          * older binaries will still expect the old MD format entries, we 
345          * create those as usual and use versioned tags for the new entries.
346          */
347         if (username == NULL) {
348                 /* Do not add the VERSION tag when updating a single
349                  * user.  When operating on `old format' databases, this
350                  * would result in applications `seeing' only the updated
351                  * entries.
352                  */
353                 key.data = verskey;
354                 key.size = sizeof(verskey)-1;
355                 data.data = &version;
356                 data.size = 1;
357                 if ((dp->put)(dp, &key, &data, 0) == -1)
358                         error("put");
359                 if ((sdp->put)(sdp, &key, &data, 0) == -1)
360                         error("put");
361         }
362         ypcnt = 0;
363         data.data = (u_char *)buf;
364         sdata.data = (u_char *)sbuf;
365         key.data = (u_char *)tbuf;
366         for (cnt = 1; scan(fp, &pwd); ++cnt) {
367                 if (!is_comment && 
368                     (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-')) {
369                         yp_enabled = 1;
370                         ypcnt++;
371                 }
372                 if (is_comment)
373                         --cnt;
374 #define COMPACT(e)      t = e; while ((*p++ = *t++));
375 #define SCALAR(e)       store = htonl((uint32_t)(e));      \
376                         memmove(p, &store, sizeof(store)); \
377                         p += sizeof(store);
378 #define LSCALAR(e)      store = HTOL((uint32_t)(e));       \
379                         memmove(p, &store, sizeof(store)); \
380                         p += sizeof(store);
381 #define HTOL(e)         (openinfo.lorder == BYTE_ORDER ? \
382                         (uint32_t)(e) : \
383                         bswap32((uint32_t)(e)))
384                 if (!is_comment && 
385                     (!username || (strcmp(username, pwd.pw_name) == 0))) {
386                         /* Create insecure data. */
387                         p = buf;
388                         COMPACT(pwd.pw_name);
389                         COMPACT("*");
390                         SCALAR(pwd.pw_uid);
391                         SCALAR(pwd.pw_gid);
392                         SCALAR(pwd.pw_change);
393                         COMPACT(pwd.pw_class);
394                         COMPACT(pwd.pw_gecos);
395                         COMPACT(pwd.pw_dir);
396                         COMPACT(pwd.pw_shell);
397                         SCALAR(pwd.pw_expire);
398                         SCALAR(pwd.pw_fields);
399                         data.size = p - buf;
400
401                         /* Create secure data. */
402                         p = sbuf;
403                         COMPACT(pwd.pw_name);
404                         COMPACT(pwd.pw_passwd);
405                         SCALAR(pwd.pw_uid);
406                         SCALAR(pwd.pw_gid);
407                         SCALAR(pwd.pw_change);
408                         COMPACT(pwd.pw_class);
409                         COMPACT(pwd.pw_gecos);
410                         COMPACT(pwd.pw_dir);
411                         COMPACT(pwd.pw_shell);
412                         SCALAR(pwd.pw_expire);
413                         SCALAR(pwd.pw_fields);
414                         sdata.size = p - sbuf;
415
416                         /* Store insecure 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 ((dp->put)(dp, &key, &data, method) == -1)
422                                 error("put");
423
424                         /* Store insecure 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 ((dp->put)(dp, &key, &data, method) == -1)
430                                 error("put");
431
432                         /* Store insecure 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 ((dp->put)(dp, &key, &data, methoduid) == -1)
438                                 error("put");
439
440                         /* Store secure by name. */
441                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYNAME);
442                         len = strlen(pwd.pw_name);
443                         memmove(tbuf + 1, pwd.pw_name, len);
444                         key.size = len + 1;
445                         if ((sdp->put)(sdp, &key, &sdata, method) == -1)
446                                 error("put");
447
448                         /* Store secure by number. */
449                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYNUM);
450                         store = htonl(cnt);
451                         memmove(tbuf + 1, &store, sizeof(store));
452                         key.size = sizeof(store) + 1;
453                         if ((sdp->put)(sdp, &key, &sdata, method) == -1)
454                                 error("put");
455
456                         /* Store secure by uid. */
457                         tbuf[0] = CURRENT_VERSION(_PW_KEYBYUID);
458                         store = htonl(pwd.pw_uid);
459                         memmove(tbuf + 1, &store, sizeof(store));
460                         key.size = sizeof(store) + 1;
461                         if ((sdp->put)(sdp, &key, &sdata, methoduid) == -1)
462                                 error("put");
463
464                         /* Store insecure and secure special plus and special minus */
465                         if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') {
466                                 tbuf[0] = CURRENT_VERSION(_PW_KEYYPBYNUM);
467                                 store = htonl(ypcnt);
468                                 memmove(tbuf + 1, &store, sizeof(store));
469                                 key.size = sizeof(store) + 1;
470                                 if ((dp->put)(dp, &key, &data, method) == -1)
471                                         error("put");
472                                 if ((sdp->put)(sdp, &key, &sdata, method) == -1)
473                                         error("put");
474                         }
475
476                         if (lflag) {
477                                 /* Create insecure data. (legacy version) */
478                                 p = buf;
479                                 COMPACT(pwd.pw_name);
480                                 COMPACT("*");
481                                 LSCALAR(pwd.pw_uid);
482                                 LSCALAR(pwd.pw_gid);
483                                 LSCALAR(pwd.pw_change);
484                                 COMPACT(pwd.pw_class);
485                                 COMPACT(pwd.pw_gecos);
486                                 COMPACT(pwd.pw_dir);
487                                 COMPACT(pwd.pw_shell);
488                                 LSCALAR(pwd.pw_expire);
489                                 LSCALAR(pwd.pw_fields);
490                                 data.size = p - buf;
491
492                                 /* Create secure data. (legacy version) */
493                                 p = sbuf;
494                                 COMPACT(pwd.pw_name);
495                                 COMPACT(pwd.pw_passwd);
496                                 LSCALAR(pwd.pw_uid);
497                                 LSCALAR(pwd.pw_gid);
498                                 LSCALAR(pwd.pw_change);
499                                 COMPACT(pwd.pw_class);
500                                 COMPACT(pwd.pw_gecos);
501                                 COMPACT(pwd.pw_dir);
502                                 COMPACT(pwd.pw_shell);
503                                 LSCALAR(pwd.pw_expire);
504                                 LSCALAR(pwd.pw_fields);
505                                 sdata.size = p - sbuf;
506
507                                 /* Store insecure 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 ((dp->put)(dp, &key, &data, method) == -1)
513                                         error("put");
514
515                                 /* Store insecure 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 ((dp->put)(dp, &key, &data, method) == -1)
521                                         error("put");
522
523                                 /* Store insecure 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 ((dp->put)(dp, &key, &data, methoduid) == -1)
529                                         error("put");
530
531                                 /* Store secure by name. */
532                                 tbuf[0] = LEGACY_VERSION(_PW_KEYBYNAME);
533                                 len = strlen(pwd.pw_name);
534                                 memmove(tbuf + 1, pwd.pw_name, len);
535                                 key.size = len + 1;
536                                 if ((sdp->put)(sdp, &key, &sdata, method) == -1)
537                                         error("put");
538
539                                 /* Store secure by number. */
540                                 tbuf[0] = LEGACY_VERSION(_PW_KEYBYNUM);
541                                 store = HTOL(cnt);
542                                 memmove(tbuf + 1, &store, sizeof(store));
543                                 key.size = sizeof(store) + 1;
544                                 if ((sdp->put)(sdp, &key, &sdata, method) == -1)
545                                         error("put");
546
547                                 /* Store secure by uid. */
548                                 tbuf[0] = LEGACY_VERSION(_PW_KEYBYUID);
549                                 store = HTOL(pwd.pw_uid);
550                                 memmove(tbuf + 1, &store, sizeof(store));
551                                 key.size = sizeof(store) + 1;
552                                 if ((sdp->put)(sdp, &key, &sdata, methoduid) == -1)
553                                         error("put");
554
555                                 /* Store insecure and secure special plus and special minus */
556                                 if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') {
557                                         tbuf[0] = LEGACY_VERSION(_PW_KEYYPBYNUM);
558                                         store = HTOL(ypcnt);
559                                         memmove(tbuf + 1, &store, sizeof(store));
560                                         key.size = sizeof(store) + 1;
561                                         if ((dp->put)(dp, &key, &data, method) == -1)
562                                                 error("put");
563                                         if ((sdp->put)(sdp, &key, &sdata, method) == -1)
564                                                 error("put");
565                                 }
566                         }
567                 }
568                 /* Create original format password file entry */
569                 if (is_comment && makeold){     /* copy comments */
570                         if (fprintf(oldfp, "%s\n", line) < 0)
571                                 error("write old");
572                 } else if (makeold) {
573                         char uidstr[20];
574                         char gidstr[20];
575
576                         snprintf(uidstr, sizeof(uidstr), "%u", pwd.pw_uid);
577                         snprintf(gidstr, sizeof(gidstr), "%u", pwd.pw_gid);
578
579                         if (fprintf(oldfp, "%s:*:%s:%s:%s:%s:%s\n",
580                             pwd.pw_name, pwd.pw_fields & _PWF_UID ? uidstr : "",
581                             pwd.pw_fields & _PWF_GID ? gidstr : "",
582                             pwd.pw_gecos, pwd.pw_dir, pwd.pw_shell) < 0)
583                                 error("write old");
584                 }
585         }
586         /* If YP enabled, set flag. */
587         if (yp_enabled) {
588                 buf[0] = yp_enabled + 2;
589                 data.size = 1;
590                 key.size = 1;
591                 tbuf[0] = CURRENT_VERSION(_PW_KEYYPENABLED);
592                 if ((dp->put)(dp, &key, &data, method) == -1)
593                         error("put");
594                 if ((sdp->put)(sdp, &key, &data, method) == -1)
595                         error("put");
596                 if (lflag) {
597                         tbuf[0] = LEGACY_VERSION(_PW_KEYYPENABLED);
598                         key.size = 1;
599                         if ((dp->put)(dp, &key, &data, method) == -1)
600                                 error("put");
601                         if ((sdp->put)(sdp, &key, &data, method) == -1)
602                                 error("put");
603                 }
604         }
605
606         if ((dp->close)(dp) == -1)
607                 error("close");
608         if ((sdp->close)(sdp) == -1)
609                 error("close");
610         if (makeold) {
611                 (void)fflush(oldfp);
612                 if (fclose(oldfp) == EOF)
613                         error("close old");
614         }
615
616         /* Set master.passwd permissions, in case caller forgot. */
617         (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR);
618
619         /* Install as the real password files. */
620         (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB);
621         (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB);
622         mv(buf, buf2);
623         (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB);
624         (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _SMP_DB);
625         mv(buf, buf2);
626         if (makeold) {
627                 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _PASSWD);
628                 (void)snprintf(buf, sizeof(buf), "%s.orig", pname);
629                 mv(buf, buf2);
630         }
631         /*
632          * Move the master password LAST -- chpass(1), passwd(1) and vipw(8)
633          * all use flock(2) on it to block other incarnations of themselves.
634          * The rename means that everything is unlocked, as the original file
635          * can no longer be accessed.
636          */
637         (void)snprintf(buf, sizeof(buf), "%s/%s", prefix, _MASTERPASSWD);
638         mv(pname, buf);
639
640         /*
641          * Close locked password file after rename()
642          */
643         if (fclose(fp) == EOF)
644                 error("close fp");
645
646         exit(0);
647 }
648
649 int
650 scan(FILE *fp, struct passwd *pw)
651 {
652         static int lcnt;
653         size_t len;
654         char *p;
655
656         p = fgetln(fp, &len);
657         if (p == NULL)
658                 return (0);
659         ++lcnt;
660         /*
661          * ``... if I swallow anything evil, put your fingers down my
662          * throat...''
663          *      -- The Who
664          */
665         if (len > 0 && p[len - 1] == '\n')
666                 len--;
667         if (len >= sizeof(line) - 1) {
668                 warnx("line #%d too long", lcnt);
669                 goto fmt;
670         }
671         memcpy(line, p, len);
672         line[len] = '\0';
673
674         /* 
675          * Ignore comments: ^[ \t]*#
676          */
677         for (p = line; *p != '\0'; p++)
678                 if (*p != ' ' && *p != '\t')
679                         break;
680         if (*p == '#' || *p == '\0') {
681                 is_comment = 1;
682                 return(1);
683         } else
684                 is_comment = 0;
685
686         if (!__pw_scan(line, pw, _PWSCAN_WARN|_PWSCAN_MASTER)) {
687                 warnx("at line #%d", lcnt);
688 fmt:            errno = EFTYPE; /* XXX */
689                 error(pname);
690         }
691
692         return (1);
693 }
694
695 void                    
696 cp(char *from, char *to, mode_t mode)              
697 {               
698         static char buf[MAXBSIZE];
699         int from_fd, rcount, to_fd, wcount;
700
701         if ((from_fd = open(from, O_RDONLY, 0)) < 0)
702                 error(from);
703         if ((to_fd = open(to, O_WRONLY|O_CREAT|O_EXCL, mode)) < 0)
704                 error(to);
705         while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
706                 wcount = write(to_fd, buf, rcount);
707                 if (rcount != wcount || wcount == -1) {
708                         int sverrno = errno;
709
710                         (void)snprintf(buf, sizeof(buf), "%s to %s", from, to);
711                         errno = sverrno;
712                         error(buf);
713                 }
714         }
715         if (rcount < 0) {
716                 int sverrno = errno;
717
718                 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to);
719                 errno = sverrno;
720                 error(buf);
721         }
722 }
723
724
725 void
726 mv(char *from, char *to)
727 {
728         char buf[MAXPATHLEN];
729         char *to_dir;
730         int to_dir_fd = -1;
731
732         /*
733          * Make sure file is safe on disk. To improve performance we will call
734          * fsync() to the directory where file lies
735          */
736         if (rename(from, to) != 0 ||
737             (to_dir = dirname(to)) == NULL ||
738             (to_dir_fd = open(to_dir, O_RDONLY|O_DIRECTORY)) == -1 ||
739             fsync(to_dir_fd) != 0) {
740                 int sverrno = errno;
741                 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to);
742                 errno = sverrno;
743                 if (to_dir_fd != -1)
744                         close(to_dir_fd);
745                 error(buf);
746         }
747
748         if (to_dir_fd != -1)
749                 close(to_dir_fd);
750 }
751
752 void
753 error(const char *name)
754 {
755
756         warn("%s", name);
757         cleanup();
758         exit(1);
759 }
760
761 void
762 cleanup(void)
763 {
764         char buf[MAXPATHLEN];
765
766         switch(clean) {
767         case FILE_ORIG:
768                 (void)snprintf(buf, sizeof(buf), "%s.orig", pname);
769                 (void)unlink(buf);
770                 /* FALLTHROUGH */
771         case FILE_SECURE:
772                 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB);
773                 (void)unlink(buf);
774                 /* FALLTHROUGH */
775         case FILE_INSECURE:
776                 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB);
777                 (void)unlink(buf);
778         }
779 }
780
781 static void
782 usage(void)
783 {
784
785         (void)fprintf(stderr,
786 "usage: pwd_mkdb [-BCiLNp] [-d directory] [-s cachesize] [-u username] file\n");
787         exit(1);
788 }