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[dragonfly.git] / usr.sbin / pw / pw_user.c
blob109e79f7ea3b9cbc952ddf8aec37b20312f2c0a8
1 /*-
2 * Copyright (C) 1996
3 * David L. Nugent. 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 *
14 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 *
27 * $FreeBSD: src/usr.sbin/pw/pw_user.c,v 1.34.2.13 2003/02/01 21:20:10 gad Exp $
28 * $DragonFly: src/usr.sbin/pw/pw_user.c,v 1.4 2004/11/30 20:12:21 joerg Exp $
29 */
30
31 #include <ctype.h>
32 #include <err.h>
33 #include <fcntl.h>
34 #include <sys/param.h>
35 #include <dirent.h>
36 #include <paths.h>
37 #include <termios.h>
38 #include <sys/types.h>
39 #include <sys/time.h>
40 #include <sys/resource.h>
41 #include <unistd.h>
42 #include <utmp.h>
43 #include <login_cap.h>
44 #if defined(USE_MD5RAND)
45 #include <md5.h>
46 #endif
47 #include "pw.h"
48 #include "bitmap.h"
49
50 #if (MAXLOGNAME-1) > UT_NAMESIZE
51 #define LOGNAMESIZE UT_NAMESIZE
52 #else
53 #define LOGNAMESIZE (MAXLOGNAME-1)
54 #endif
55
56 static char locked_str[] = "*LOCKED*";
57
58 static int print_user(struct passwd * pwd, int pretty, int v7);
59 static uid_t pw_uidpolicy(struct userconf * cnf, struct cargs * args);
60 static uid_t pw_gidpolicy(struct userconf * cnf, struct cargs * args, char *nam, gid_t prefer);
61 static time_t pw_pwdpolicy(struct userconf * cnf, struct cargs * args);
62 static time_t pw_exppolicy(struct userconf * cnf, struct cargs * args);
63 static char *pw_homepolicy(struct userconf * cnf, struct cargs * args, char const * user);
64 static char *pw_shellpolicy(struct userconf * cnf, struct cargs * args, char *newshell);
65 static char *pw_password(struct userconf * cnf, struct cargs * args, char const * user);
66 static char *shell_path(char const * path, char *shells[], char *sh);
67 static void rmat(uid_t uid);
68 static void rmskey(char const * name);
69
70 /*-
71 * -C config configuration file
72 * -q quiet operation
73 * -n name login name
74 * -u uid user id
75 * -c comment user name/comment
76 * -d directory home directory
77 * -e date account expiry date
78 * -p date password expiry date
79 * -g grp primary group
80 * -G grp1,grp2 additional groups
81 * -m [ -k dir ] create and set up home
82 * -s shell name of login shell
83 * -o duplicate uid ok
84 * -L class user class
85 * -l name new login name
86 * -h fd password filehandle
87 * -F force print or add
88 * Setting defaults:
89 * -D set user defaults
90 * -b dir default home root dir
91 * -e period default expiry period
92 * -p period default password change period
93 * -g group default group
94 * -G grp1,grp2.. default additional groups
95 * -L class default login class
96 * -k dir default home skeleton
97 * -s shell default shell
98 * -w method default password method
99 */
100
101 int
102 pw_user(struct userconf * cnf, int mode, struct cargs * args)
103 {
104 int rc, edited = 0;
105 char *p = NULL;
106 char *passtmp;
107 struct carg *a_name;
108 struct carg *a_uid;
109 struct carg *arg;
110 struct passwd *pwd = NULL;
111 struct group *grp;
112 struct stat st;
113 char line[_PASSWORD_LEN+1];
114 FILE *fp;
115
116 static struct passwd fakeuser =
117 {
118 NULL,
119 "*",
120 -1,
121 -1,
122 0,
123 "",
124 "User &",
125 "/nonexistent",
126 "/bin/sh",
127 0
128 #if defined(__DragonFly__)
129 ,0
130 #endif
131 };
132
133
134 /*
135 * With M_NEXT, we only need to return the
136 * next uid to stdout
137 */
138 if (mode == M_NEXT)
139 {
140 uid_t next = pw_uidpolicy(cnf, args);
141 if (getarg(args, 'q'))
142 return next;
143 printf("%ld:", (long)next);
144 pw_group(cnf, mode, args);
145 return EXIT_SUCCESS;
146 }
147
148 /*
149 * We can do all of the common legwork here
150 */
151
152 if ((arg = getarg(args, 'b')) != NULL) {
153 cnf->home = arg->val;
154 }
155
156 /*
157 * If we'll need to use it or we're updating it,
158 * then create the base home directory if necessary
159 */
160 if (arg != NULL || getarg(args, 'm') != NULL) {
161 int l = strlen(cnf->home);
162
163 if (l > 1 && cnf->home[l-1] == '/') /* Shave off any trailing path delimiter */
164 cnf->home[--l] = '\0';
165
166 if (l < 2 || *cnf->home != '/') /* Check for absolute path name */
167 errx(EX_DATAERR, "invalid base directory for home '%s'", cnf->home);
168
169 if (stat(cnf->home, &st) == -1) {
170 char dbuf[MAXPATHLEN];
171
172 /*
173 * This is a kludge especially for Joerg :)
174 * If the home directory would be created in the root partition, then
175 * we really create it under /usr which is likely to have more space.
176 * But we create a symlink from cnf->home -> "/usr" -> cnf->home
177 */
178 if (strchr(cnf->home+1, '/') == NULL) {
179 strcpy(dbuf, "/usr");
180 strncat(dbuf, cnf->home, MAXPATHLEN-5);
181 if (mkdir(dbuf, 0755) != -1 || errno == EEXIST) {
182 chown(dbuf, 0, 0);
183 symlink(dbuf, cnf->home);
184 }
185 /* If this falls, fall back to old method */
186 }
187 p = strncpy(dbuf, cnf->home, sizeof dbuf);
188 dbuf[MAXPATHLEN-1] = '\0';
189 if (stat(dbuf, &st) == -1) {
190 while ((p = strchr(++p, '/')) != NULL) {
191 *p = '\0';
192 if (stat(dbuf, &st) == -1) {
193 if (mkdir(dbuf, 0755) == -1)
194 goto direrr;
195 chown(dbuf, 0, 0);
196 } else if (!S_ISDIR(st.st_mode))
197 errx(EX_OSFILE, "'%s' (root home parent) is not a directory", dbuf);
198 *p = '/';
199 }
200 }
201 if (stat(dbuf, &st) == -1) {
202 if (mkdir(dbuf, 0755) == -1) {
203 direrr: err(EX_OSFILE, "mkdir '%s'", dbuf);
204 }
205 chown(dbuf, 0, 0);
206 }
207 } else if (!S_ISDIR(st.st_mode))
208 errx(EX_OSFILE, "root home `%s' is not a directory", cnf->home);
209 }
210
211 if ((arg = getarg(args, 'e')) != NULL)
212 cnf->expire_days = atoi(arg->val);
213
214 if ((arg = getarg(args, 'y')) != NULL)
215 cnf->nispasswd = arg->val;
216
217 if ((arg = getarg(args, 'p')) != NULL && arg->val)
218 cnf->password_days = atoi(arg->val);
219
220 if ((arg = getarg(args, 'g')) != NULL) {
221 if (!*(p = arg->val)) /* Handle empty group list specially */
222 cnf->default_group = "";
223 else {
224 if ((grp = GETGRNAM(p)) == NULL) {
225 if (!isdigit((unsigned char)*p) || (grp = GETGRGID((gid_t) atoi(p))) == NULL)
226 errx(EX_NOUSER, "group `%s' does not exist", p);
227 }
228 cnf->default_group = newstr(grp->gr_name);
229 }
230 }
231 if ((arg = getarg(args, 'L')) != NULL)
232 cnf->default_class = pw_checkname((u_char *)arg->val, 0);
233
234 if ((arg = getarg(args, 'G')) != NULL && arg->val) {
235 int i = 0;
236
237 for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
238 if ((grp = GETGRNAM(p)) == NULL) {
239 if (!isdigit((unsigned char)*p) || (grp = GETGRGID((gid_t) atoi(p))) == NULL)
240 errx(EX_NOUSER, "group `%s' does not exist", p);
241 }
242 if (extendarray(&cnf->groups, &cnf->numgroups, i + 2) != -1)
243 cnf->groups[i++] = newstr(grp->gr_name);
244 }
245 while (i < cnf->numgroups)
246 cnf->groups[i++] = NULL;
247 }
248
249 if ((arg = getarg(args, 'k')) != NULL) {
250 if (stat(cnf->dotdir = arg->val, &st) == -1 || !S_ISDIR(st.st_mode))
251 errx(EX_OSFILE, "skeleton `%s' is not a directory or does not exist", cnf->dotdir);
252 }
253
254 if ((arg = getarg(args, 's')) != NULL)
255 cnf->shell_default = arg->val;
256
257 if ((arg = getarg(args, 'w')) != NULL)
258 cnf->default_password = boolean_val(arg->val, cnf->default_password);
259 if (mode == M_ADD && getarg(args, 'D')) {
260 if (getarg(args, 'n') != NULL)
261 errx(EX_DATAERR, "can't combine `-D' with `-n name'");
262 if ((arg = getarg(args, 'u')) != NULL && (p = strtok(arg->val, ", \t")) != NULL) {
263 if ((cnf->min_uid = (uid_t) atoi(p)) == 0)
264 cnf->min_uid = 1000;
265 if ((p = strtok(NULL, " ,\t")) == NULL || (cnf->max_uid = (uid_t) atoi(p)) < cnf->min_uid)
266 cnf->max_uid = 32000;
267 }
268 if ((arg = getarg(args, 'i')) != NULL && (p = strtok(arg->val, ", \t")) != NULL) {
269 if ((cnf->min_gid = (gid_t) atoi(p)) == 0)
270 cnf->min_gid = 1000;
271 if ((p = strtok(NULL, " ,\t")) == NULL || (cnf->max_gid = (gid_t) atoi(p)) < cnf->min_gid)
272 cnf->max_gid = 32000;
273 }
274
275 arg = getarg(args, 'C');
276 if (write_userconfig(arg ? arg->val : NULL))
277 return EXIT_SUCCESS;
278 warn("config update");
279 return EX_IOERR;
280 }
281
282 if (mode == M_PRINT && getarg(args, 'a')) {
283 int pretty = getarg(args, 'P') != NULL;
284 int v7 = getarg(args, '7') != NULL;
285
286 SETPWENT();
287 while ((pwd = GETPWENT()) != NULL)
288 print_user(pwd, pretty, v7);
289 ENDPWENT();
290 return EXIT_SUCCESS;
291 }
292
293 if ((a_name = getarg(args, 'n')) != NULL)
294 pwd = GETPWNAM(pw_checkname((u_char *)a_name->val, 0));
295 a_uid = getarg(args, 'u');
296
297 if (a_uid == NULL) {
298 if (a_name == NULL)
299 errx(EX_DATAERR, "user name or id required");
300
301 /*
302 * Determine whether 'n' switch is name or uid - we don't
303 * really don't really care which we have, but we need to
304 * know.
305 */
306 if (mode != M_ADD && pwd == NULL
307 && strspn(a_name->val, "0123456789") == strlen(a_name->val)
308 && atoi(a_name->val) > 0) { /* Assume uid */
309 (a_uid = a_name)->ch = 'u';
310 a_name = NULL;
311 }
312 }
313
314 /*
315 * Update, delete & print require that the user exists
316 */
317 if (mode == M_UPDATE || mode == M_DELETE ||
318 mode == M_PRINT || mode == M_LOCK || mode == M_UNLOCK) {
319
320 if (a_name == NULL && pwd == NULL) /* Try harder */
321 pwd = GETPWUID(atoi(a_uid->val));
322
323 if (pwd == NULL) {
324 if (mode == M_PRINT && getarg(args, 'F')) {
325 fakeuser.pw_name = a_name ? a_name->val : "nouser";
326 fakeuser.pw_uid = a_uid ? (uid_t) atol(a_uid->val) : -1;
327 return print_user(&fakeuser,
328 getarg(args, 'P') != NULL,
329 getarg(args, '7') != NULL);
330 }
331 if (a_name == NULL)
332 errx(EX_NOUSER, "no such uid `%s'", a_uid->val);
333 errx(EX_NOUSER, "no such user `%s'", a_name->val);
334 }
335
336 if (a_name == NULL) /* May be needed later */
337 a_name = addarg(args, 'n', newstr(pwd->pw_name));
338
339 /*
340 * The M_LOCK and M_UNLOCK functions simply add or remove
341 * a "*LOCKED*" prefix from in front of the password to
342 * prevent it decoding correctly, and therefore prevents
343 * access. Of course, this only prevents access via
344 * password authentication (not ssh, kerberos or any
345 * other method that does not use the UNIX password) but
346 * that is a known limitation.
347 */
348
349 if (mode == M_LOCK) {
350 if (strncmp(pwd->pw_passwd, locked_str, sizeof(locked_str)-1) == 0)
351 errx(EX_DATAERR, "user '%s' is already locked", pwd->pw_name);
352 passtmp = malloc(strlen(pwd->pw_passwd) + sizeof(locked_str));
353 if (passtmp == NULL) /* disaster */
354 errx(EX_UNAVAILABLE, "out of memory");
355 strcpy(passtmp, locked_str);
356 strcat(passtmp, pwd->pw_passwd);
357 pwd->pw_passwd = passtmp;
358 edited = 1;
359 } else if (mode == M_UNLOCK) {
360 if (strncmp(pwd->pw_passwd, locked_str, sizeof(locked_str)-1) != 0)
361 errx(EX_DATAERR, "user '%s' is not locked", pwd->pw_name);
362 pwd->pw_passwd += sizeof(locked_str)-1;
363 edited = 1;
364 } else if (mode == M_DELETE) {
365 /*
366 * Handle deletions now
367 */
368 char file[MAXPATHLEN];
369 char home[MAXPATHLEN];
370 uid_t uid = pwd->pw_uid;
371
372 if (strcmp(pwd->pw_name, "root") == 0)
373 errx(EX_DATAERR, "cannot remove user 'root'");
374
375 if (!PWALTDIR()) {
376 /*
377 * Remove skey record from /etc/skeykeys
378 */
379
380 rmskey(pwd->pw_name);
381
382 /*
383 * Remove crontabs
384 */
385 sprintf(file, "/var/cron/tabs/%s", pwd->pw_name);
386 if (access(file, F_OK) == 0) {
387 sprintf(file, "crontab -u %s -r", pwd->pw_name);
388 system(file);
389 }
390 }
391 /*
392 * Save these for later, since contents of pwd may be
393 * invalidated by deletion
394 */
395 sprintf(file, "%s/%s", _PATH_MAILDIR, pwd->pw_name);
396 strlcpy(home, pwd->pw_dir, sizeof home);
397
398 rc = delpwent(pwd);
399 if (rc == -1)
400 err(EX_IOERR, "user '%s' does not exist", pwd->pw_name);
401 else if (rc != 0) {
402 warn("passwd update");
403 return EX_IOERR;
404 }
405
406 if (cnf->nispasswd && *cnf->nispasswd=='/') {
407 rc = delnispwent(cnf->nispasswd, a_name->val);
408 if (rc == -1)
409 warnx("WARNING: user '%s' does not exist in NIS passwd", pwd->pw_name);
410 else if (rc != 0)
411 warn("WARNING: NIS passwd update");
412 /* non-fatal */
413 }
414
415 editgroups(a_name->val, NULL);
416
417 pw_log(cnf, mode, W_USER, "%s(%ld) account removed", a_name->val, (long) uid);
418
419 if (!PWALTDIR()) {
420 /*
421 * Remove mail file
422 */
423 remove(file);
424
425 /*
426 * Remove at jobs
427 */
428 if (getpwuid(uid) == NULL)
429 rmat(uid);
430
431 /*
432 * Remove home directory and contents
433 */
434 if (getarg(args, 'r') != NULL && *home == '/' && getpwuid(uid) == NULL) {
435 if (stat(home, &st) != -1) {
436 rm_r(home, uid);
437 pw_log(cnf, mode, W_USER, "%s(%ld) home '%s' %sremoved",
438 a_name->val, (long) uid, home,
439 stat(home, &st) == -1 ? "" : "not completely ");
440 }
441 }
442 }
443 return EXIT_SUCCESS;
444 } else if (mode == M_PRINT)
445 return print_user(pwd,
446 getarg(args, 'P') != NULL,
447 getarg(args, '7') != NULL);
448
449 /*
450 * The rest is edit code
451 */
452 if ((arg = getarg(args, 'l')) != NULL) {
453 if (strcmp(pwd->pw_name, "root") == 0)
454 errx(EX_DATAERR, "can't rename `root' account");
455 pwd->pw_name = pw_checkname((u_char *)arg->val, 0);
456 edited = 1;
457 }
458
459 if ((arg = getarg(args, 'u')) != NULL && isdigit((unsigned char)*arg->val)) {
460 pwd->pw_uid = (uid_t) atol(arg->val);
461 edited = 1;
462 if (pwd->pw_uid != 0 && strcmp(pwd->pw_name, "root") == 0)
463 errx(EX_DATAERR, "can't change uid of `root' account");
464 if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0)
465 warnx("WARNING: account `%s' will have a uid of 0 (superuser access!)", pwd->pw_name);
466 }
467
468 if ((arg = getarg(args, 'g')) != NULL && pwd->pw_uid != 0) { /* Already checked this */
469 gid_t newgid = (gid_t) GETGRNAM(cnf->default_group)->gr_gid;
470 if (newgid != pwd->pw_gid) {
471 edited = 1;
472 pwd->pw_gid = newgid;
473 }
474 }
475
476 if ((arg = getarg(args, 'p')) != NULL) {
477 if (*arg->val == '\0' || strcmp(arg->val, "0") == 0) {
478 if (pwd->pw_change != 0) {
479 pwd->pw_change = 0;
480 edited = 1;
481 }
482 }
483 else {
484 time_t now = time(NULL);
485 time_t expire = parse_date(now, arg->val);
486
487 if (now == expire)
488 errx(EX_DATAERR, "invalid password change date `%s'", arg->val);
489 if (pwd->pw_change != expire) {
490 pwd->pw_change = expire;
491 edited = 1;
492 }
493 }
494 }
495
496 if ((arg = getarg(args, 'e')) != NULL) {
497 if (*arg->val == '\0' || strcmp(arg->val, "0") == 0) {
498 if (pwd->pw_expire != 0) {
499 pwd->pw_expire = 0;
500 edited = 1;
501 }
502 }
503 else {
504 time_t now = time(NULL);
505 time_t expire = parse_date(now, arg->val);
506
507 if (now == expire)
508 errx(EX_DATAERR, "invalid account expiry date `%s'", arg->val);
509 if (pwd->pw_expire != expire) {
510 pwd->pw_expire = expire;
511 edited = 1;
512 }
513 }
514 }
515
516 if ((arg = getarg(args, 's')) != NULL) {
517 char *shell = shell_path(cnf->shelldir, cnf->shells, arg->val);
518 if (shell == NULL)
519 shell = "";
520 if (strcmp(shell, pwd->pw_shell) != 0) {
521 pwd->pw_shell = shell;
522 edited = 1;
523 }
524 }
525
526 if (getarg(args, 'L')) {
527 if (cnf->default_class == NULL)
528 cnf->default_class = "";
529 if (strcmp(pwd->pw_class, cnf->default_class) != 0) {
530 pwd->pw_class = cnf->default_class;
531 edited = 1;
532 }
533 }
534
535 if ((arg = getarg(args, 'd')) != NULL) {
536 edited = strcmp(pwd->pw_dir, arg->val) != 0;
537 if (stat(pwd->pw_dir = arg->val, &st) == -1) {
538 if (getarg(args, 'm') == NULL && strcmp(pwd->pw_dir, "/nonexistent") != 0)
539 warnx("WARNING: home `%s' does not exist", pwd->pw_dir);
540 } else if (!S_ISDIR(st.st_mode))
541 warnx("WARNING: home `%s' is not a directory", pwd->pw_dir);
542 }
543
544 if ((arg = getarg(args, 'w')) != NULL && getarg(args, 'h') == NULL) {
545 login_cap_t *lc;
546
547 lc = login_getpwclass(pwd);
548 if (lc == NULL ||
549 login_setcryptfmt(lc, "md5", NULL) == NULL)
550 warn("setting crypt(3) format");
551 login_close(lc);
552 pwd->pw_passwd = pw_password(cnf, args, pwd->pw_name);
553 edited = 1;
554 }
555
556 } else {
557 login_cap_t *lc;
558
559 /*
560 * Add code
561 */
562
563 if (a_name == NULL) /* Required */
564 errx(EX_DATAERR, "login name required");
565 else if ((pwd = GETPWNAM(a_name->val)) != NULL) /* Exists */
566 errx(EX_DATAERR, "login name `%s' already exists", a_name->val);
567
568 /*
569 * Now, set up defaults for a new user
570 */
571 pwd = &fakeuser;
572 pwd->pw_name = a_name->val;
573 pwd->pw_class = cnf->default_class ? cnf->default_class : "";
574 pwd->pw_uid = pw_uidpolicy(cnf, args);
575 pwd->pw_gid = pw_gidpolicy(cnf, args, pwd->pw_name, (gid_t) pwd->pw_uid);
576 pwd->pw_change = pw_pwdpolicy(cnf, args);
577 pwd->pw_expire = pw_exppolicy(cnf, args);
578 pwd->pw_dir = pw_homepolicy(cnf, args, pwd->pw_name);
579 pwd->pw_shell = pw_shellpolicy(cnf, args, NULL);
580 lc = login_getpwclass(pwd);
581 if (lc == NULL || login_setcryptfmt(lc, "md5", NULL) == NULL)
582 warn("setting crypt(3) format");
583 login_close(lc);
584 pwd->pw_passwd = pw_password(cnf, args, pwd->pw_name);
585 edited = 1;
586
587 if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0)
588 warnx("WARNING: new account `%s' has a uid of 0 (superuser access!)", pwd->pw_name);
589 }
590
591 /*
592 * Shared add/edit code
593 */
594 if ((arg = getarg(args, 'c')) != NULL) {
595 char *gecos = pw_checkname((u_char *)arg->val, 1);
596 if (strcmp(pwd->pw_gecos, gecos) != 0) {
597 pwd->pw_gecos = gecos;
598 edited = 1;
599 }
600 }
601
602 if ((arg = getarg(args, 'h')) != NULL) {
603 if (strcmp(arg->val, "-") == 0) {
604 if (!pwd->pw_passwd || *pwd->pw_passwd != '*') {
605 pwd->pw_passwd = "*"; /* No access */
606 edited = 1;
607 }
608 } else {
609 int fd = atoi(arg->val);
610 int b;
611 int istty = isatty(fd);
612 struct termios t;
613 login_cap_t *lc;
614
615 if (istty) {
616 if (tcgetattr(fd, &t) == -1)
617 istty = 0;
618 else {
619 struct termios n = t;
620
621 /* Disable echo */
622 n.c_lflag &= ~(ECHO);
623 tcsetattr(fd, TCSANOW, &n);
624 printf("%sassword for user %s:", (mode == M_UPDATE) ? "New p" : "P", pwd->pw_name);
625 fflush(stdout);
626 }
627 }
628 b = read(fd, line, sizeof(line) - 1);
629 if (istty) { /* Restore state */
630 tcsetattr(fd, TCSANOW, &t);
631 fputc('\n', stdout);
632 fflush(stdout);
633 }
634 if (b < 0) {
635 warn("-h file descriptor");
636 return EX_IOERR;
637 }
638 line[b] = '\0';
639 if ((p = strpbrk(line, " \t\r\n")) != NULL)
640 *p = '\0';
641 if (!*line)
642 errx(EX_DATAERR, "empty password read on file descriptor %d", fd);
643 lc = login_getpwclass(pwd);
644 if (lc == NULL ||
645 login_setcryptfmt(lc, "md5", NULL) == NULL)
646 warn("setting crypt(3) format");
647 login_close(lc);
648 pwd->pw_passwd = pw_pwcrypt(line);
649 edited = 1;
650 }
651 }
652
653 /*
654 * Special case: -N only displays & exits
655 */
656 if (getarg(args, 'N') != NULL)
657 return print_user(pwd,
658 getarg(args, 'P') != NULL,
659 getarg(args, '7') != NULL);
660
661 if (mode == M_ADD) {
662 edited = 1; /* Always */
663 rc = addpwent(pwd);
664 if (rc == -1) {
665 warnx("user '%s' already exists", pwd->pw_name);
666 return EX_IOERR;
667 } else if (rc != 0) {
668 warn("passwd file update");
669 return EX_IOERR;
670 }
671 if (cnf->nispasswd && *cnf->nispasswd=='/') {
672 rc = addnispwent(cnf->nispasswd, pwd);
673 if (rc == -1)
674 warnx("User '%s' already exists in NIS passwd", pwd->pw_name);
675 else
676 warn("NIS passwd update");
677 /* NOTE: we treat NIS-only update errors as non-fatal */
678 }
679 } else if (mode == M_UPDATE || mode == M_LOCK || mode == M_UNLOCK) {
680 if (edited) { /* Only updated this if required */
681 rc = chgpwent(a_name->val, pwd);
682 if (rc == -1) {
683 warnx("user '%s' does not exist (NIS?)", pwd->pw_name);
684 return EX_IOERR;
685 } else if (rc != 0) {
686 warn("passwd file update");
687 return EX_IOERR;
688 }
689 if ( cnf->nispasswd && *cnf->nispasswd=='/') {
690 rc = chgnispwent(cnf->nispasswd, a_name->val, pwd);
691 if (rc == -1)
692 warn("User '%s' not found in NIS passwd", pwd->pw_name);
693 else
694 warn("NIS passwd update");
695 /* NOTE: NIS-only update errors are not fatal */
696 }
697 }
698 }
699
700 /*
701 * Ok, user is created or changed - now edit group file
702 */
703
704 if (mode == M_ADD || getarg(args, 'G') != NULL)
705 editgroups(pwd->pw_name, cnf->groups);
706
707 /* go get a current version of pwd */
708 pwd = GETPWNAM(a_name->val);
709 if (pwd == NULL) {
710 /* This will fail when we rename, so special case that */
711 if (mode == M_UPDATE && (arg = getarg(args, 'l')) != NULL) {
712 a_name->val = arg->val; /* update new name */
713 pwd = GETPWNAM(a_name->val); /* refetch renamed rec */
714 }
715 }
716 if (pwd == NULL) /* can't go on without this */
717 errx(EX_NOUSER, "user '%s' disappeared during update", a_name->val);
718
719 grp = GETGRGID(pwd->pw_gid);
720 pw_log(cnf, mode, W_USER, "%s(%ld):%s(%ld):%s:%s:%s",
721 pwd->pw_name, (long) pwd->pw_uid,
722 grp ? grp->gr_name : "unknown", (long) (grp ? grp->gr_gid : -1),
723 pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell);
724
725 /*
726 * If adding, let's touch and chown the user's mail file. This is not
727 * strictly necessary under BSD with a 0755 maildir but it also
728 * doesn't hurt anything to create the empty mailfile
729 */
730 if (mode == M_ADD) {
731 if (!PWALTDIR()) {
732 sprintf(line, "%s/%s", _PATH_MAILDIR, pwd->pw_name);
733 close(open(line, O_RDWR | O_CREAT, 0600)); /* Preserve contents &
734 * mtime */
735 chown(line, pwd->pw_uid, pwd->pw_gid);
736 }
737 }
738
739 /*
740 * Let's create and populate the user's home directory. Note
741 * that this also `works' for editing users if -m is used, but
742 * existing files will *not* be overwritten.
743 */
744 if (!PWALTDIR() && getarg(args, 'm') != NULL && pwd->pw_dir && *pwd->pw_dir == '/' && pwd->pw_dir[1]) {
745 copymkdir(pwd->pw_dir, cnf->dotdir, 0755, pwd->pw_uid, pwd->pw_gid);
746 pw_log(cnf, mode, W_USER, "%s(%ld) home %s made",
747 pwd->pw_name, (long) pwd->pw_uid, pwd->pw_dir);
748 }
749
750
751 /*
752 * Finally, send mail to the new user as well, if we are asked to
753 */
754 if (mode == M_ADD && !PWALTDIR() && cnf->newmail && *cnf->newmail && (fp = fopen(cnf->newmail, "r")) != NULL) {
755 FILE *pfp = popen(_PATH_SENDMAIL " -t", "w");
756
757 if (pfp == NULL)
758 warn("sendmail");
759 else {
760 fprintf(pfp, "From: root\n" "To: %s\n" "Subject: Welcome!\n\n", pwd->pw_name);
761 while (fgets(line, sizeof(line), fp) != NULL) {
762 /* Do substitutions? */
763 fputs(line, pfp);
764 }
765 pclose(pfp);
766 pw_log(cnf, mode, W_USER, "%s(%ld) new user mail sent",
767 pwd->pw_name, (long) pwd->pw_uid);
768 }
769 fclose(fp);
770 }
771
772 return EXIT_SUCCESS;
773 }
774
775
776 static uid_t
777 pw_uidpolicy(struct userconf * cnf, struct cargs * args)
778 {
779 struct passwd *pwd;
780 uid_t uid = (uid_t) - 1;
781 struct carg *a_uid = getarg(args, 'u');
782
783 /*
784 * Check the given uid, if any
785 */
786 if (a_uid != NULL) {
787 uid = (uid_t) atol(a_uid->val);
788
789 if ((pwd = GETPWUID(uid)) != NULL && getarg(args, 'o') == NULL)
790 errx(EX_DATAERR, "uid `%ld' has already been allocated", (long) pwd->pw_uid);
791 } else {
792 struct bitmap bm;
793
794 /*
795 * We need to allocate the next available uid under one of
796 * two policies a) Grab the first unused uid b) Grab the
797 * highest possible unused uid
798 */
799 if (cnf->min_uid >= cnf->max_uid) { /* Sanity
800 * claus^H^H^H^Hheck */
801 cnf->min_uid = 1000;
802 cnf->max_uid = 32000;
803 }
804 bm = bm_alloc(cnf->max_uid - cnf->min_uid + 1);
805
806 /*
807 * Now, let's fill the bitmap from the password file
808 */
809 SETPWENT();
810 while ((pwd = GETPWENT()) != NULL)
811 if (pwd->pw_uid >= (uid_t) cnf->min_uid && pwd->pw_uid <= (uid_t) cnf->max_uid)
812 bm_setbit(&bm, pwd->pw_uid - cnf->min_uid);
813 ENDPWENT();
814
815 /*
816 * Then apply the policy, with fallback to reuse if necessary
817 */
818 if (cnf->reuse_uids || (uid = (uid_t) (bm_lastset(&bm) + cnf->min_uid + 1)) > cnf->max_uid)
819 uid = (uid_t) (bm_firstunset(&bm) + cnf->min_uid);
820
821 /*
822 * Another sanity check
823 */
824 if (uid < cnf->min_uid || uid > cnf->max_uid)
825 errx(EX_SOFTWARE, "unable to allocate a new uid - range fully used");
826 bm_dealloc(&bm);
827 }
828 return uid;
829 }
830
831
832 static uid_t
833 pw_gidpolicy(struct userconf * cnf, struct cargs * args, char *nam, gid_t prefer)
834 {
835 struct group *grp;
836 gid_t gid = (uid_t) - 1;
837 struct carg *a_gid = getarg(args, 'g');
838
839 /*
840 * If no arg given, see if default can help out
841 */
842 if (a_gid == NULL && cnf->default_group && *cnf->default_group)
843 a_gid = addarg(args, 'g', cnf->default_group);
844
845 /*
846 * Check the given gid, if any
847 */
848 SETGRENT();
849 if (a_gid != NULL) {
850 if ((grp = GETGRNAM(a_gid->val)) == NULL) {
851 gid = (gid_t) atol(a_gid->val);
852 if ((gid == 0 && !isdigit((unsigned char)*a_gid->val)) || (grp = GETGRGID(gid)) == NULL)
853 errx(EX_NOUSER, "group `%s' is not defined", a_gid->val);
854 }
855 gid = grp->gr_gid;
856 } else if ((grp = GETGRNAM(nam)) != NULL && grp->gr_mem[0] == NULL) {
857 gid = grp->gr_gid; /* Already created? Use it anyway... */
858 } else {
859 struct cargs grpargs;
860 char tmp[32];
861
862 LIST_INIT(&grpargs);
863 addarg(&grpargs, 'n', nam);
864
865 /*
866 * We need to auto-create a group with the user's name. We
867 * can send all the appropriate output to our sister routine
868 * bit first see if we can create a group with gid==uid so we
869 * can keep the user and group ids in sync. We purposely do
870 * NOT check the gid range if we can force the sync. If the
871 * user's name dups an existing group, then the group add
872 * function will happily handle that case for us and exit.
873 */
874 if (GETGRGID(prefer) == NULL) {
875 sprintf(tmp, "%lu", (unsigned long) prefer);
876 addarg(&grpargs, 'g', tmp);
877 }
878 if (getarg(args, 'N'))
879 {
880 addarg(&grpargs, 'N', NULL);
881 addarg(&grpargs, 'q', NULL);
882 gid = pw_group(cnf, M_NEXT, &grpargs);
883 }
884 else
885 {
886 pw_group(cnf, M_ADD, &grpargs);
887 if ((grp = GETGRNAM(nam)) != NULL)
888 gid = grp->gr_gid;
889 }
890 a_gid = grpargs.lh_first;
891 while (a_gid != NULL) {
892 struct carg *t = a_gid->list.le_next;
893 LIST_REMOVE(a_gid, list);
894 a_gid = t;
895 }
896 }
897 ENDGRENT();
898 return gid;
899 }
900
901
902 static time_t
903 pw_pwdpolicy(struct userconf * cnf, struct cargs * args)
904 {
905 time_t result = 0;
906 time_t now = time(NULL);
907 struct carg *arg = getarg(args, 'p');
908
909 if (arg != NULL) {
910 if ((result = parse_date(now, arg->val)) == now)
911 errx(EX_DATAERR, "invalid date/time `%s'", arg->val);
912 } else if (cnf->password_days > 0)
913 result = now + ((long) cnf->password_days * 86400L);
914 return result;
915 }
916
917
918 static time_t
919 pw_exppolicy(struct userconf * cnf, struct cargs * args)
920 {
921 time_t result = 0;
922 time_t now = time(NULL);
923 struct carg *arg = getarg(args, 'e');
924
925 if (arg != NULL) {
926 if ((result = parse_date(now, arg->val)) == now)
927 errx(EX_DATAERR, "invalid date/time `%s'", arg->val);
928 } else if (cnf->expire_days > 0)
929 result = now + ((long) cnf->expire_days * 86400L);
930 return result;
931 }
932
933
934 static char *
935 pw_homepolicy(struct userconf * cnf, struct cargs * args, char const * user)
936 {
937 struct carg *arg = getarg(args, 'd');
938
939 if (arg)
940 return arg->val;
941 else {
942 static char home[128];
943
944 if (cnf->home == NULL || *cnf->home == '\0')
945 errx(EX_CONFIG, "no base home directory set");
946 sprintf(home, "%s/%s", cnf->home, user);
947 return home;
948 }
949 }
950
951 static char *
952 shell_path(char const * path, char *shells[], char *sh)
953 {
954 if (sh != NULL && (*sh == '/' || *sh == '\0'))
955 return sh; /* specified full path or forced none */
956 else {
957 char *p;
958 char paths[_UC_MAXLINE];
959
960 /*
961 * We need to search paths
962 */
963 strncpy(paths, path, sizeof paths);
964 paths[sizeof paths - 1] = '\0';
965 for (p = strtok(paths, ": \t\r\n"); p != NULL; p = strtok(NULL, ": \t\r\n")) {
966 int i;
967 static char shellpath[256];
968
969 if (sh != NULL) {
970 sprintf(shellpath, "%s/%s", p, sh);
971 if (access(shellpath, X_OK) == 0)
972 return shellpath;
973 } else
974 for (i = 0; i < _UC_MAXSHELLS && shells[i] != NULL; i++) {
975 sprintf(shellpath, "%s/%s", p, shells[i]);
976 if (access(shellpath, X_OK) == 0)
977 return shellpath;
978 }
979 }
980 if (sh == NULL)
981 errx(EX_OSFILE, "can't find shell `%s' in shell paths", sh);
982 errx(EX_CONFIG, "no default shell available or defined");
983 return NULL;
984 }
985 }
986
987
988 static char *
989 pw_shellpolicy(struct userconf * cnf, struct cargs * args, char *newshell)
990 {
991 char *sh = newshell;
992 struct carg *arg = getarg(args, 's');
993
994 if (newshell == NULL && arg != NULL)
995 sh = arg->val;
996 return shell_path(cnf->shelldir, cnf->shells, sh ? sh : cnf->shell_default);
997 }
998
999 static char const chars[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ.";
1000
1001 char *
1002 pw_pwcrypt(char *password)
1003 {
1004 int i;
1005 char salt[12];
1006
1007 static char buf[256];
1008
1009 /*
1010 * Calculate a salt value
1011 */
1012 for (i = 0; i < 8; i++)
1013 salt[i] = chars[arc4random() % 63];
1014 salt[i] = '\0';
1015
1016 return strcpy(buf, crypt(password, salt));
1017 }
1018
1019 #if defined(USE_MD5RAND)
1020 u_char *
1021 pw_getrand(u_char *buf, int len) /* cryptographically secure rng */
1022 {
1023 int i;
1024 for (i=0;i<len;i+=16) {
1025 u_char ubuf[16];
1026
1027 MD5_CTX md5_ctx;
1028 struct timeval tv, tvo;
1029 struct rusage ru;
1030 int n=0;
1031 int t;
1032
1033 MD5Init (&md5_ctx);
1034 t=getpid();
1035 MD5Update (&md5_ctx, (u_char*)&t, sizeof t);
1036 t=getppid();
1037 MD5Update (&md5_ctx, (u_char*)&t, sizeof t);
1038 gettimeofday (&tvo, NULL);
1039 do {
1040 getrusage (RUSAGE_SELF, &ru);
1041 MD5Update (&md5_ctx, (u_char*)&ru, sizeof ru);
1042 gettimeofday (&tv, NULL);
1043 MD5Update (&md5_ctx, (u_char*)&tv, sizeof tv);
1044 } while (n++<20 || tv.tv_usec-tvo.tv_usec<100*1000);
1045 MD5Final (ubuf, &md5_ctx);
1046 memcpy(buf+i, ubuf, MIN(16, len-i));
1047 }
1048 return buf;
1049 }
1050
1051 #else /* Portable version */
1052
1053 static u_char *
1054 pw_getrand(u_char *buf, int len)
1055 {
1056 int i;
1057
1058 srandomdev();
1059 for (i = 0; i < len; i++) {
1060 unsigned long val = random();
1061 /* Use all bits in the random value */
1062 buf[i]=(u_char)((val >> 24) ^ (val >> 16) ^ (val >> 8) ^ val);
1063 }
1064 return buf;
1065 }
1066
1067 #endif
1068
1069 static char *
1070 pw_password(struct userconf * cnf, struct cargs * args, char const * user)
1071 {
1072 int i, l;
1073 char pwbuf[32];
1074 u_char rndbuf[sizeof pwbuf];
1075
1076 switch (cnf->default_password) {
1077 case -1: /* Random password */
1078 l = (arc4random() % 8 + 8); /* 8 - 16 chars */
1079 pw_getrand(rndbuf, l);
1080 for (i = 0; i < l; i++)
1081 pwbuf[i] = chars[rndbuf[i] % (sizeof(chars)-1)];
1082 pwbuf[i] = '\0';
1083
1084 /*
1085 * We give this information back to the user
1086 */
1087 if (getarg(args, 'h') == NULL && getarg(args, 'N') == NULL) {
1088 if (isatty(STDOUT_FILENO))
1089 printf("Password for '%s' is: ", user);
1090 printf("%s\n", pwbuf);
1091 fflush(stdout);
1092 }
1093 break;
1094
1095 case -2: /* No password at all! */
1096 return "";
1097
1098 case 0: /* No login - default */
1099 default:
1100 return "*";
1101
1102 case 1: /* user's name */
1103 strncpy(pwbuf, user, sizeof pwbuf);
1104 pwbuf[sizeof pwbuf - 1] = '\0';
1105 break;
1106 }
1107 return pw_pwcrypt(pwbuf);
1108 }
1109
1110
1111 static int
1112 print_user(struct passwd * pwd, int pretty, int v7)
1113 {
1114 if (!pretty) {
1115 char buf[_UC_MAXLINE];
1116
1117 fmtpwentry(buf, pwd, v7 ? PWF_PASSWD : PWF_STANDARD);
1118 fputs(buf, stdout);
1119 } else {
1120 int j;
1121 char *p;
1122 struct group *grp = GETGRGID(pwd->pw_gid);
1123 char uname[60] = "User &", office[60] = "[None]",
1124 wphone[60] = "[None]", hphone[60] = "[None]";
1125 char acexpire[32] = "[None]", pwexpire[32] = "[None]";
1126 struct tm * tptr;
1127
1128 if ((p = strtok(pwd->pw_gecos, ",")) != NULL) {
1129 strncpy(uname, p, sizeof uname);
1130 uname[sizeof uname - 1] = '\0';
1131 if ((p = strtok(NULL, ",")) != NULL) {
1132 strncpy(office, p, sizeof office);
1133 office[sizeof office - 1] = '\0';
1134 if ((p = strtok(NULL, ",")) != NULL) {
1135 strncpy(wphone, p, sizeof wphone);
1136 wphone[sizeof wphone - 1] = '\0';
1137 if ((p = strtok(NULL, "")) != NULL) {
1138 strncpy(hphone, p, sizeof hphone);
1139 hphone[sizeof hphone - 1] = '\0';
1140 }
1141 }
1142 }
1143 }
1144 /*
1145 * Handle '&' in gecos field
1146 */
1147 if ((p = strchr(uname, '&')) != NULL) {
1148 int l = strlen(pwd->pw_name);
1149 int m = strlen(p);
1150
1151 memmove(p + l, p + 1, m);
1152 memmove(p, pwd->pw_name, l);
1153 *p = (char) toupper((unsigned char)*p);
1154 }
1155 if (pwd->pw_expire > (time_t)0 && (tptr = localtime(&pwd->pw_expire)) != NULL)
1156 strftime(acexpire, sizeof acexpire, "%c", tptr);
1157 if (pwd->pw_change > (time_t)0 && (tptr = localtime(&pwd->pw_change)) != NULL)
1158 strftime(pwexpire, sizeof pwexpire, "%c", tptr);
1159 printf("Login Name: %-15s #%-12ld Group: %-15s #%ld\n"
1160 " Full Name: %s\n"
1161 " Home: %-26.26s Class: %s\n"
1162 " Shell: %-26.26s Office: %s\n"
1163 "Work Phone: %-26.26s Home Phone: %s\n"
1164 "Acc Expire: %-26.26s Pwd Expire: %s\n",
1165 pwd->pw_name, (long) pwd->pw_uid,
1166 grp ? grp->gr_name : "(invalid)", (long) pwd->pw_gid,
1167 uname, pwd->pw_dir, pwd->pw_class,
1168 pwd->pw_shell, office, wphone, hphone,
1169 acexpire, pwexpire);
1170 SETGRENT();
1171 j = 0;
1172 while ((grp=GETGRENT()) != NULL)
1173 {
1174 int i = 0;
1175 while (grp->gr_mem[i] != NULL)
1176 {
1177 if (strcmp(grp->gr_mem[i], pwd->pw_name)==0)
1178 {
1179 printf(j++ == 0 ? " Groups: %s" : ",%s", grp->gr_name);
1180 break;
1181 }
1182 ++i;
1183 }
1184 }
1185 ENDGRENT();
1186 printf("%s", j ? "\n" : "");
1187 }
1188 return EXIT_SUCCESS;
1189 }
1190
1191 char *
1192 pw_checkname(u_char *name, int gecos)
1193 {
1194 char showch[8];
1195 u_char const *badchars, *ch, *showtype;
1196 int reject;
1197
1198 ch = name;
1199 reject = 0;
1200 if (gecos) {
1201 /* See if the name is valid as a gecos (comment) field. */
1202 badchars = ":!@";
1203 showtype = "gecos field";
1204 } else {
1205 /* See if the name is valid as a userid or group. */
1206 badchars = " ,\t:+&#%$^()!@~*?<>=|\\/\"";
1207 showtype = "userid/group name";
1208 /* Userids and groups can not have a leading '-'. */
1209 if (*ch == '-')
1210 reject = 1;
1211 }
1212 if (!reject) {
1213 while (*ch) {
1214 if (strchr(badchars, *ch) != NULL || *ch < ' ' ||
1215 *ch == 127) {
1216 reject = 1;
1217 break;
1218 }
1219 /* 8-bit characters are only allowed in GECOS fields */
1220 if (!gecos && (*ch & 0x80)) {
1221 reject = 1;
1222 break;
1223 }
1224 ch++;
1225 }
1226 }
1227 /*
1228 * A `$' is allowed as the final character for userids and groups,
1229 * mainly for the benefit of samba.
1230 */
1231 if (reject && !gecos) {
1232 if (*ch == '$' && *(ch + 1) == '\0') {
1233 reject = 0;
1234 ch++;
1235 }
1236 }
1237 if (reject) {
1238 snprintf(showch, sizeof(showch), (*ch >= ' ' && *ch < 127)
1239 ? "`%c'" : "0x%02x", *ch);
1240 errx(EX_DATAERR, "invalid character %s at position %d in %s",
1241 showch, (ch - name), showtype);
1242 }
1243 if (!gecos && (ch - name) > LOGNAMESIZE)
1244 errx(EX_DATAERR, "name too long `%s' (max is %d)", name,
1245 LOGNAMESIZE);
1246 return (char *)name;
1247 }
1248
1249
1250 static void
1251 rmat(uid_t uid)
1252 {
1253 DIR *d = opendir("/var/at/jobs");
1254
1255 if (d != NULL) {
1256 struct dirent *e;
1257
1258 while ((e = readdir(d)) != NULL) {
1259 struct stat st;
1260
1261 if (strncmp(e->d_name, ".lock", 5) != 0 &&
1262 stat(e->d_name, &st) == 0 &&
1263 !S_ISDIR(st.st_mode) &&
1264 st.st_uid == uid) {
1265 char tmp[MAXPATHLEN];
1266
1267 sprintf(tmp, "/usr/bin/atrm %s", e->d_name);
1268 system(tmp);
1269 }
1270 }
1271 closedir(d);
1272 }
1273 }
1274
1275 static void
1276 rmskey(char const * name)
1277 {
1278 static const char etcskey[] = "/etc/skeykeys";
1279 FILE *fp = fopen(etcskey, "r+");
1280
1281 if (fp != NULL) {
1282 char tmp[1024];
1283 off_t atofs = 0;
1284 int length = strlen(name);
1285
1286 while (fgets(tmp, sizeof tmp, fp) != NULL) {
1287 if (strncmp(name, tmp, length) == 0 && tmp[length]==' ') {
1288 if (fseek(fp, atofs, SEEK_SET) == 0) {
1289 fwrite("#", 1, 1, fp); /* Comment username out */
1290 }
1291 break;
1292 }
1293 atofs = ftell(fp);
1294 }
1295 /*
1296 * If we got an error of any sort, don't update!
1297 */
1298 fclose(fp);
1299 }
1300 }
1301
DragonFly BSD