]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * Copyright (c) 2000 Andre Lucas. All rights reserved. | |
3 | * Portions copyright (c) 1998 Todd C. Miller | |
4 | * Portions copyright (c) 1996 Jason Downs | |
5 | * Portions copyright (c) 1996 Theo de Raadt | |
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 | * | |
16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
19 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
26 | */ | |
27 | ||
28 | /* | |
29 | * The btmp logging code is derived from login.c from util-linux and is under | |
30 | * the the following license: | |
31 | * | |
32 | * Copyright (c) 1980, 1987, 1988 The Regents of the University of California. | |
33 | * All rights reserved. | |
34 | * | |
35 | * Redistribution and use in source and binary forms are permitted | |
36 | * provided that the above copyright notice and this paragraph are | |
37 | * duplicated in all such forms and that any documentation, | |
38 | * advertising materials, and other materials related to such | |
39 | * distribution and use acknowledge that the software was developed | |
40 | * by the University of California, Berkeley. The name of the | |
41 | * University may not be used to endorse or promote products derived | |
42 | * from this software without specific prior written permission. | |
43 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
44 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
45 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
46 | */ | |
47 | ||
48 | ||
49 | /** | |
50 | ** loginrec.c: platform-independent login recording and lastlog retrieval | |
51 | **/ | |
52 | ||
53 | /* | |
54 | * The new login code explained | |
55 | * ============================ | |
56 | * | |
57 | * This code attempts to provide a common interface to login recording | |
58 | * (utmp and friends) and last login time retrieval. | |
59 | * | |
60 | * Its primary means of achieving this is to use 'struct logininfo', a | |
61 | * union of all the useful fields in the various different types of | |
62 | * system login record structures one finds on UNIX variants. | |
63 | * | |
64 | * We depend on autoconf to define which recording methods are to be | |
65 | * used, and which fields are contained in the relevant data structures | |
66 | * on the local system. Many C preprocessor symbols affect which code | |
67 | * gets compiled here. | |
68 | * | |
69 | * The code is designed to make it easy to modify a particular | |
70 | * recording method, without affecting other methods nor requiring so | |
71 | * many nested conditional compilation blocks as were commonplace in | |
72 | * the old code. | |
73 | * | |
74 | * For login recording, we try to use the local system's libraries as | |
75 | * these are clearly most likely to work correctly. For utmp systems | |
76 | * this usually means login() and logout() or setutent() etc., probably | |
77 | * in libutil, along with logwtmp() etc. On these systems, we fall back | |
78 | * to writing the files directly if we have to, though this method | |
79 | * requires very thorough testing so we do not corrupt local auditing | |
80 | * information. These files and their access methods are very system | |
81 | * specific indeed. | |
82 | * | |
83 | * For utmpx systems, the corresponding library functions are | |
84 | * setutxent() etc. To the author's knowledge, all utmpx systems have | |
85 | * these library functions and so no direct write is attempted. If such | |
86 | * a system exists and needs support, direct analogues of the [uw]tmp | |
87 | * code should suffice. | |
88 | * | |
89 | * Retrieving the time of last login ('lastlog') is in some ways even | |
90 | * more problemmatic than login recording. Some systems provide a | |
91 | * simple table of all users which we seek based on uid and retrieve a | |
92 | * relatively standard structure. Others record the same information in | |
93 | * a directory with a separate file, and others don't record the | |
94 | * information separately at all. For systems in the latter category, | |
95 | * we look backwards in the wtmp or wtmpx file for the last login entry | |
96 | * for our user. Naturally this is slower and on busy systems could | |
97 | * incur a significant performance penalty. | |
98 | * | |
99 | * Calling the new code | |
100 | * -------------------- | |
101 | * | |
102 | * In OpenSSH all login recording and retrieval is performed in | |
103 | * login.c. Here you'll find working examples. Also, in the logintest.c | |
104 | * program there are more examples. | |
105 | * | |
106 | * Internal handler calling method | |
107 | * ------------------------------- | |
108 | * | |
109 | * When a call is made to login_login() or login_logout(), both | |
110 | * routines set a struct logininfo flag defining which action (log in, | |
111 | * or log out) is to be taken. They both then call login_write(), which | |
112 | * calls whichever of the many structure-specific handlers autoconf | |
113 | * selects for the local system. | |
114 | * | |
115 | * The handlers themselves handle system data structure specifics. Both | |
116 | * struct utmp and struct utmpx have utility functions (see | |
117 | * construct_utmp*()) to try to make it simpler to add extra systems | |
118 | * that introduce new features to either structure. | |
119 | * | |
120 | * While it may seem terribly wasteful to replicate so much similar | |
121 | * code for each method, experience has shown that maintaining code to | |
122 | * write both struct utmp and utmpx in one function, whilst maintaining | |
123 | * support for all systems whether they have library support or not, is | |
124 | * a difficult and time-consuming task. | |
125 | * | |
126 | * Lastlog support proceeds similarly. Functions login_get_lastlog() | |
127 | * (and its OpenSSH-tuned friend login_get_lastlog_time()) call | |
128 | * getlast_entry(), which tries one of three methods to find the last | |
129 | * login time. It uses local system lastlog support if it can, | |
130 | * otherwise it tries wtmp or wtmpx before giving up and returning 0, | |
131 | * meaning "tilt". | |
132 | * | |
133 | * Maintenance | |
134 | * ----------- | |
135 | * | |
136 | * In many cases it's possible to tweak autoconf to select the correct | |
137 | * methods for a particular platform, either by improving the detection | |
138 | * code (best), or by presetting DISABLE_<method> or CONF_<method>_FILE | |
139 | * symbols for the platform. | |
140 | * | |
141 | * Use logintest to check which symbols are defined before modifying | |
142 | * configure.ac and loginrec.c. (You have to build logintest yourself | |
143 | * with 'make logintest' as it's not built by default.) | |
144 | * | |
145 | * Otherwise, patches to the specific method(s) are very helpful! | |
146 | */ | |
147 | ||
148 | #include "includes.h" | |
149 | ||
150 | #include "ssh.h" | |
151 | #include "xmalloc.h" | |
152 | #include "loginrec.h" | |
153 | #include "log.h" | |
154 | #include "atomicio.h" | |
155 | #include "packet.h" | |
156 | #include "canohost.h" | |
157 | ||
158 | #ifdef HAVE_UTIL_H | |
159 | # include <util.h> | |
160 | #endif | |
161 | ||
162 | #ifdef HAVE_LIBUTIL_H | |
163 | # include <libutil.h> | |
164 | #endif | |
165 | ||
166 | RCSID("$Id$"); | |
167 | ||
168 | /** | |
169 | ** prototypes for helper functions in this file | |
170 | **/ | |
171 | ||
172 | #if HAVE_UTMP_H | |
173 | void set_utmp_time(struct logininfo *li, struct utmp *ut); | |
174 | void construct_utmp(struct logininfo *li, struct utmp *ut); | |
175 | #endif | |
176 | ||
177 | #ifdef HAVE_UTMPX_H | |
178 | void set_utmpx_time(struct logininfo *li, struct utmpx *ut); | |
179 | void construct_utmpx(struct logininfo *li, struct utmpx *ut); | |
180 | #endif | |
181 | ||
182 | int utmp_write_entry(struct logininfo *li); | |
183 | int utmpx_write_entry(struct logininfo *li); | |
184 | int wtmp_write_entry(struct logininfo *li); | |
185 | int wtmpx_write_entry(struct logininfo *li); | |
186 | int lastlog_write_entry(struct logininfo *li); | |
187 | int syslogin_write_entry(struct logininfo *li); | |
188 | ||
189 | int getlast_entry(struct logininfo *li); | |
190 | int lastlog_get_entry(struct logininfo *li); | |
191 | int wtmp_get_entry(struct logininfo *li); | |
192 | int wtmpx_get_entry(struct logininfo *li); | |
193 | ||
194 | /* pick the shortest string */ | |
195 | #define MIN_SIZEOF(s1,s2) (sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2)) | |
196 | ||
197 | /** | |
198 | ** platform-independent login functions | |
199 | **/ | |
200 | ||
201 | /* | |
202 | * login_login(struct logininfo *) - Record a login | |
203 | * | |
204 | * Call with a pointer to a struct logininfo initialised with | |
205 | * login_init_entry() or login_alloc_entry() | |
206 | * | |
207 | * Returns: | |
208 | * >0 if successful | |
209 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
210 | */ | |
211 | int | |
212 | login_login(struct logininfo *li) | |
213 | { | |
214 | li->type = LTYPE_LOGIN; | |
215 | return (login_write(li)); | |
216 | } | |
217 | ||
218 | ||
219 | /* | |
220 | * login_logout(struct logininfo *) - Record a logout | |
221 | * | |
222 | * Call as with login_login() | |
223 | * | |
224 | * Returns: | |
225 | * >0 if successful | |
226 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
227 | */ | |
228 | int | |
229 | login_logout(struct logininfo *li) | |
230 | { | |
231 | li->type = LTYPE_LOGOUT; | |
232 | return (login_write(li)); | |
233 | } | |
234 | ||
235 | /* | |
236 | * login_get_lastlog_time(int) - Retrieve the last login time | |
237 | * | |
238 | * Retrieve the last login time for the given uid. Will try to use the | |
239 | * system lastlog facilities if they are available, but will fall back | |
240 | * to looking in wtmp/wtmpx if necessary | |
241 | * | |
242 | * Returns: | |
243 | * 0 on failure, or if user has never logged in | |
244 | * Time in seconds from the epoch if successful | |
245 | * | |
246 | * Useful preprocessor symbols: | |
247 | * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog | |
248 | * info | |
249 | * USE_LASTLOG: If set, indicates the presence of system lastlog | |
250 | * facilities. If this and DISABLE_LASTLOG are not set, | |
251 | * try to retrieve lastlog information from wtmp/wtmpx. | |
252 | */ | |
253 | unsigned int | |
254 | login_get_lastlog_time(const int uid) | |
255 | { | |
256 | struct logininfo li; | |
257 | ||
258 | if (login_get_lastlog(&li, uid)) | |
259 | return (li.tv_sec); | |
260 | else | |
261 | return (0); | |
262 | } | |
263 | ||
264 | /* | |
265 | * login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry | |
266 | * | |
267 | * Retrieve a logininfo structure populated (only partially) with | |
268 | * information from the system lastlog data, or from wtmp/wtmpx if no | |
269 | * system lastlog information exists. | |
270 | * | |
271 | * Note this routine must be given a pre-allocated logininfo. | |
272 | * | |
273 | * Returns: | |
274 | * >0: A pointer to your struct logininfo if successful | |
275 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
276 | */ | |
277 | struct logininfo * | |
278 | login_get_lastlog(struct logininfo *li, const int uid) | |
279 | { | |
280 | struct passwd *pw; | |
281 | ||
282 | memset(li, '\0', sizeof(*li)); | |
283 | li->uid = uid; | |
284 | ||
285 | /* | |
286 | * If we don't have a 'real' lastlog, we need the username to | |
287 | * reliably search wtmp(x) for the last login (see | |
288 | * wtmp_get_entry().) | |
289 | */ | |
290 | pw = getpwuid(uid); | |
291 | if (pw == NULL) | |
292 | fatal("%s: Cannot find account for uid %i", __func__, uid); | |
293 | ||
294 | /* No MIN_SIZEOF here - we absolutely *must not* truncate the | |
295 | * username (XXX - so check for trunc!) */ | |
296 | strlcpy(li->username, pw->pw_name, sizeof(li->username)); | |
297 | ||
298 | if (getlast_entry(li)) | |
299 | return (li); | |
300 | else | |
301 | return (NULL); | |
302 | } | |
303 | ||
304 | ||
305 | /* | |
306 | * login_alloc_entry(int, char*, char*, char*) - Allocate and initialise | |
307 | * a logininfo structure | |
308 | * | |
309 | * This function creates a new struct logininfo, a data structure | |
310 | * meant to carry the information required to portably record login info. | |
311 | * | |
312 | * Returns a pointer to a newly created struct logininfo. If memory | |
313 | * allocation fails, the program halts. | |
314 | */ | |
315 | struct | |
316 | logininfo *login_alloc_entry(int pid, const char *username, | |
317 | const char *hostname, const char *line) | |
318 | { | |
319 | struct logininfo *newli; | |
320 | ||
321 | newli = xmalloc(sizeof(*newli)); | |
322 | login_init_entry(newli, pid, username, hostname, line); | |
323 | return (newli); | |
324 | } | |
325 | ||
326 | ||
327 | /* login_free_entry(struct logininfo *) - free struct memory */ | |
328 | void | |
329 | login_free_entry(struct logininfo *li) | |
330 | { | |
331 | xfree(li); | |
332 | } | |
333 | ||
334 | ||
335 | /* login_init_entry(struct logininfo *, int, char*, char*, char*) | |
336 | * - initialise a struct logininfo | |
337 | * | |
338 | * Populates a new struct logininfo, a data structure meant to carry | |
339 | * the information required to portably record login info. | |
340 | * | |
341 | * Returns: 1 | |
342 | */ | |
343 | int | |
344 | login_init_entry(struct logininfo *li, int pid, const char *username, | |
345 | const char *hostname, const char *line) | |
346 | { | |
347 | struct passwd *pw; | |
348 | ||
349 | memset(li, 0, sizeof(*li)); | |
350 | ||
351 | li->pid = pid; | |
352 | ||
353 | /* set the line information */ | |
354 | if (line) | |
355 | line_fullname(li->line, line, sizeof(li->line)); | |
356 | ||
357 | if (username) { | |
358 | strlcpy(li->username, username, sizeof(li->username)); | |
359 | pw = getpwnam(li->username); | |
360 | if (pw == NULL) { | |
361 | fatal("%s: Cannot find user \"%s\"", __func__, | |
362 | li->username); | |
363 | } | |
364 | li->uid = pw->pw_uid; | |
365 | } | |
366 | ||
367 | if (hostname) | |
368 | strlcpy(li->hostname, hostname, sizeof(li->hostname)); | |
369 | ||
370 | return (1); | |
371 | } | |
372 | ||
373 | /* | |
374 | * login_set_current_time(struct logininfo *) - set the current time | |
375 | * | |
376 | * Set the current time in a logininfo structure. This function is | |
377 | * meant to eliminate the need to deal with system dependencies for | |
378 | * time handling. | |
379 | */ | |
380 | void | |
381 | login_set_current_time(struct logininfo *li) | |
382 | { | |
383 | struct timeval tv; | |
384 | ||
385 | gettimeofday(&tv, NULL); | |
386 | ||
387 | li->tv_sec = tv.tv_sec; | |
388 | li->tv_usec = tv.tv_usec; | |
389 | } | |
390 | ||
391 | /* copy a sockaddr_* into our logininfo */ | |
392 | void | |
393 | login_set_addr(struct logininfo *li, const struct sockaddr *sa, | |
394 | const unsigned int sa_size) | |
395 | { | |
396 | unsigned int bufsize = sa_size; | |
397 | ||
398 | /* make sure we don't overrun our union */ | |
399 | if (sizeof(li->hostaddr) < sa_size) | |
400 | bufsize = sizeof(li->hostaddr); | |
401 | ||
402 | memcpy(&li->hostaddr.sa, sa, bufsize); | |
403 | } | |
404 | ||
405 | ||
406 | /** | |
407 | ** login_write: Call low-level recording functions based on autoconf | |
408 | ** results | |
409 | **/ | |
410 | int | |
411 | login_write(struct logininfo *li) | |
412 | { | |
413 | #ifndef HAVE_CYGWIN | |
414 | if (geteuid() != 0) { | |
415 | logit("Attempt to write login records by non-root user (aborting)"); | |
416 | return (1); | |
417 | } | |
418 | #endif | |
419 | ||
420 | /* set the timestamp */ | |
421 | login_set_current_time(li); | |
422 | #ifdef USE_LOGIN | |
423 | syslogin_write_entry(li); | |
424 | #endif | |
425 | #ifdef USE_LASTLOG | |
426 | if (li->type == LTYPE_LOGIN) | |
427 | lastlog_write_entry(li); | |
428 | #endif | |
429 | #ifdef USE_UTMP | |
430 | utmp_write_entry(li); | |
431 | #endif | |
432 | #ifdef USE_WTMP | |
433 | wtmp_write_entry(li); | |
434 | #endif | |
435 | #ifdef USE_UTMPX | |
436 | utmpx_write_entry(li); | |
437 | #endif | |
438 | #ifdef USE_WTMPX | |
439 | wtmpx_write_entry(li); | |
440 | #endif | |
441 | #ifdef CUSTOM_SYS_AUTH_RECORD_LOGIN | |
442 | if (li->type == LTYPE_LOGIN && | |
443 | !sys_auth_record_login(li->username,li->hostname,li->line)) | |
444 | logit("Writing login record failed for %s", li->username); | |
445 | #endif | |
446 | return (0); | |
447 | } | |
448 | ||
449 | #ifdef LOGIN_NEEDS_UTMPX | |
450 | int | |
451 | login_utmp_only(struct logininfo *li) | |
452 | { | |
453 | li->type = LTYPE_LOGIN; | |
454 | login_set_current_time(li); | |
455 | # ifdef USE_UTMP | |
456 | utmp_write_entry(li); | |
457 | # endif | |
458 | # ifdef USE_WTMP | |
459 | wtmp_write_entry(li); | |
460 | # endif | |
461 | # ifdef USE_UTMPX | |
462 | utmpx_write_entry(li); | |
463 | # endif | |
464 | # ifdef USE_WTMPX | |
465 | wtmpx_write_entry(li); | |
466 | # endif | |
467 | return (0); | |
468 | } | |
469 | #endif | |
470 | ||
471 | /** | |
472 | ** getlast_entry: Call low-level functions to retrieve the last login | |
473 | ** time. | |
474 | **/ | |
475 | ||
476 | /* take the uid in li and return the last login time */ | |
477 | int | |
478 | getlast_entry(struct logininfo *li) | |
479 | { | |
480 | #ifdef USE_LASTLOG | |
481 | return(lastlog_get_entry(li)); | |
482 | #else /* !USE_LASTLOG */ | |
483 | ||
484 | #if defined(DISABLE_LASTLOG) | |
485 | /* On some systems we shouldn't even try to obtain last login | |
486 | * time, e.g. AIX */ | |
487 | return (0); | |
488 | # elif defined(USE_WTMP) && \ | |
489 | (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) | |
490 | /* retrieve last login time from utmp */ | |
491 | return (wtmp_get_entry(li)); | |
492 | # elif defined(USE_WTMPX) && \ | |
493 | (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX)) | |
494 | /* If wtmp isn't available, try wtmpx */ | |
495 | return (wtmpx_get_entry(li)); | |
496 | # else | |
497 | /* Give up: No means of retrieving last login time */ | |
498 | return (0); | |
499 | # endif /* DISABLE_LASTLOG */ | |
500 | #endif /* USE_LASTLOG */ | |
501 | } | |
502 | ||
503 | ||
504 | ||
505 | /* | |
506 | * 'line' string utility functions | |
507 | * | |
508 | * These functions process the 'line' string into one of three forms: | |
509 | * | |
510 | * 1. The full filename (including '/dev') | |
511 | * 2. The stripped name (excluding '/dev') | |
512 | * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00 | |
513 | * /dev/pts/1 -> ts/1 ) | |
514 | * | |
515 | * Form 3 is used on some systems to identify a .tmp.? entry when | |
516 | * attempting to remove it. Typically both addition and removal is | |
517 | * performed by one application - say, sshd - so as long as the choice | |
518 | * uniquely identifies a terminal it's ok. | |
519 | */ | |
520 | ||
521 | ||
522 | /* | |
523 | * line_fullname(): add the leading '/dev/' if it doesn't exist make | |
524 | * sure dst has enough space, if not just copy src (ugh) | |
525 | */ | |
526 | char * | |
527 | line_fullname(char *dst, const char *src, int dstsize) | |
528 | { | |
529 | memset(dst, '\0', dstsize); | |
530 | if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) | |
531 | strlcpy(dst, src, dstsize); | |
532 | else { | |
533 | strlcpy(dst, "/dev/", dstsize); | |
534 | strlcat(dst, src, dstsize); | |
535 | } | |
536 | return (dst); | |
537 | } | |
538 | ||
539 | /* line_stripname(): strip the leading '/dev' if it exists, return dst */ | |
540 | char * | |
541 | line_stripname(char *dst, const char *src, int dstsize) | |
542 | { | |
543 | memset(dst, '\0', dstsize); | |
544 | if (strncmp(src, "/dev/", 5) == 0) | |
545 | strlcpy(dst, src + 5, dstsize); | |
546 | else | |
547 | strlcpy(dst, src, dstsize); | |
548 | return (dst); | |
549 | } | |
550 | ||
551 | /* | |
552 | * line_abbrevname(): Return the abbreviated (usually four-character) | |
553 | * form of the line (Just use the last <dstsize> characters of the | |
554 | * full name.) | |
555 | * | |
556 | * NOTE: use strncpy because we do NOT necessarily want zero | |
557 | * termination | |
558 | */ | |
559 | char * | |
560 | line_abbrevname(char *dst, const char *src, int dstsize) | |
561 | { | |
562 | size_t len; | |
563 | ||
564 | memset(dst, '\0', dstsize); | |
565 | ||
566 | /* Always skip prefix if present */ | |
567 | if (strncmp(src, "/dev/", 5) == 0) | |
568 | src += 5; | |
569 | ||
570 | #ifdef WITH_ABBREV_NO_TTY | |
571 | if (strncmp(src, "tty", 3) == 0) | |
572 | src += 3; | |
573 | #endif | |
574 | ||
575 | len = strlen(src); | |
576 | ||
577 | if (len > 0) { | |
578 | if (((int)len - dstsize) > 0) | |
579 | src += ((int)len - dstsize); | |
580 | ||
581 | /* note: _don't_ change this to strlcpy */ | |
582 | strncpy(dst, src, (size_t)dstsize); | |
583 | } | |
584 | ||
585 | return (dst); | |
586 | } | |
587 | ||
588 | /** | |
589 | ** utmp utility functions | |
590 | ** | |
591 | ** These functions manipulate struct utmp, taking system differences | |
592 | ** into account. | |
593 | **/ | |
594 | ||
595 | #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN) | |
596 | ||
597 | /* build the utmp structure */ | |
598 | void | |
599 | set_utmp_time(struct logininfo *li, struct utmp *ut) | |
600 | { | |
601 | # if defined(HAVE_TV_IN_UTMP) | |
602 | ut->ut_tv.tv_sec = li->tv_sec; | |
603 | ut->ut_tv.tv_usec = li->tv_usec; | |
604 | # elif defined(HAVE_TIME_IN_UTMP) | |
605 | ut->ut_time = li->tv_sec; | |
606 | # endif | |
607 | } | |
608 | ||
609 | void | |
610 | construct_utmp(struct logininfo *li, | |
611 | struct utmp *ut) | |
612 | { | |
613 | # ifdef HAVE_ADDR_V6_IN_UTMP | |
614 | struct sockaddr_in6 *sa6; | |
615 | # endif | |
616 | ||
617 | memset(ut, '\0', sizeof(*ut)); | |
618 | ||
619 | /* First fill out fields used for both logins and logouts */ | |
620 | ||
621 | # ifdef HAVE_ID_IN_UTMP | |
622 | line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id)); | |
623 | # endif | |
624 | ||
625 | # ifdef HAVE_TYPE_IN_UTMP | |
626 | /* This is done here to keep utmp constants out of struct logininfo */ | |
627 | switch (li->type) { | |
628 | case LTYPE_LOGIN: | |
629 | ut->ut_type = USER_PROCESS; | |
630 | #ifdef _UNICOS | |
631 | cray_set_tmpdir(ut); | |
632 | #endif | |
633 | break; | |
634 | case LTYPE_LOGOUT: | |
635 | ut->ut_type = DEAD_PROCESS; | |
636 | #ifdef _UNICOS | |
637 | cray_retain_utmp(ut, li->pid); | |
638 | #endif | |
639 | break; | |
640 | } | |
641 | # endif | |
642 | set_utmp_time(li, ut); | |
643 | ||
644 | line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line)); | |
645 | ||
646 | # ifdef HAVE_PID_IN_UTMP | |
647 | ut->ut_pid = li->pid; | |
648 | # endif | |
649 | ||
650 | /* If we're logging out, leave all other fields blank */ | |
651 | if (li->type == LTYPE_LOGOUT) | |
652 | return; | |
653 | ||
654 | /* | |
655 | * These fields are only used when logging in, and are blank | |
656 | * for logouts. | |
657 | */ | |
658 | ||
659 | /* Use strncpy because we don't necessarily want null termination */ | |
660 | strncpy(ut->ut_name, li->username, | |
661 | MIN_SIZEOF(ut->ut_name, li->username)); | |
662 | # ifdef HAVE_HOST_IN_UTMP | |
663 | strncpy(ut->ut_host, li->hostname, | |
664 | MIN_SIZEOF(ut->ut_host, li->hostname)); | |
665 | # endif | |
666 | # ifdef HAVE_ADDR_IN_UTMP | |
667 | /* this is just a 32-bit IP address */ | |
668 | if (li->hostaddr.sa.sa_family == AF_INET) | |
669 | ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
670 | # endif | |
671 | # ifdef HAVE_ADDR_V6_IN_UTMP | |
672 | /* this is just a 128-bit IPv6 address */ | |
673 | if (li->hostaddr.sa.sa_family == AF_INET6) { | |
674 | sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa); | |
675 | memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16); | |
676 | if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) { | |
677 | ut->ut_addr_v6[0] = ut->ut_addr_v6[3]; | |
678 | ut->ut_addr_v6[1] = 0; | |
679 | ut->ut_addr_v6[2] = 0; | |
680 | ut->ut_addr_v6[3] = 0; | |
681 | } | |
682 | } | |
683 | # endif | |
684 | } | |
685 | #endif /* USE_UTMP || USE_WTMP || USE_LOGIN */ | |
686 | ||
687 | /** | |
688 | ** utmpx utility functions | |
689 | ** | |
690 | ** These functions manipulate struct utmpx, accounting for system | |
691 | ** variations. | |
692 | **/ | |
693 | ||
694 | #if defined(USE_UTMPX) || defined (USE_WTMPX) | |
695 | /* build the utmpx structure */ | |
696 | void | |
697 | set_utmpx_time(struct logininfo *li, struct utmpx *utx) | |
698 | { | |
699 | # if defined(HAVE_TV_IN_UTMPX) | |
700 | utx->ut_tv.tv_sec = li->tv_sec; | |
701 | utx->ut_tv.tv_usec = li->tv_usec; | |
702 | # elif defined(HAVE_TIME_IN_UTMPX) | |
703 | utx->ut_time = li->tv_sec; | |
704 | # endif | |
705 | } | |
706 | ||
707 | void | |
708 | construct_utmpx(struct logininfo *li, struct utmpx *utx) | |
709 | { | |
710 | # ifdef HAVE_ADDR_V6_IN_UTMP | |
711 | struct sockaddr_in6 *sa6; | |
712 | # endif | |
713 | memset(utx, '\0', sizeof(*utx)); | |
714 | ||
715 | # ifdef HAVE_ID_IN_UTMPX | |
716 | line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id)); | |
717 | # endif | |
718 | ||
719 | /* this is done here to keep utmp constants out of loginrec.h */ | |
720 | switch (li->type) { | |
721 | case LTYPE_LOGIN: | |
722 | utx->ut_type = USER_PROCESS; | |
723 | break; | |
724 | case LTYPE_LOGOUT: | |
725 | utx->ut_type = DEAD_PROCESS; | |
726 | break; | |
727 | } | |
728 | line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line)); | |
729 | set_utmpx_time(li, utx); | |
730 | utx->ut_pid = li->pid; | |
731 | ||
732 | /* strncpy(): Don't necessarily want null termination */ | |
733 | strncpy(utx->ut_name, li->username, | |
734 | MIN_SIZEOF(utx->ut_name, li->username)); | |
735 | ||
736 | if (li->type == LTYPE_LOGOUT) | |
737 | return; | |
738 | ||
739 | /* | |
740 | * These fields are only used when logging in, and are blank | |
741 | * for logouts. | |
742 | */ | |
743 | ||
744 | # ifdef HAVE_HOST_IN_UTMPX | |
745 | strncpy(utx->ut_host, li->hostname, | |
746 | MIN_SIZEOF(utx->ut_host, li->hostname)); | |
747 | # endif | |
748 | # ifdef HAVE_ADDR_IN_UTMPX | |
749 | /* this is just a 32-bit IP address */ | |
750 | if (li->hostaddr.sa.sa_family == AF_INET) | |
751 | utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
752 | # endif | |
753 | # ifdef HAVE_ADDR_V6_IN_UTMP | |
754 | /* this is just a 128-bit IPv6 address */ | |
755 | if (li->hostaddr.sa.sa_family == AF_INET6) { | |
756 | sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa); | |
757 | memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16); | |
758 | if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) { | |
759 | ut->ut_addr_v6[0] = ut->ut_addr_v6[3]; | |
760 | ut->ut_addr_v6[1] = 0; | |
761 | ut->ut_addr_v6[2] = 0; | |
762 | ut->ut_addr_v6[3] = 0; | |
763 | } | |
764 | } | |
765 | # endif | |
766 | # ifdef HAVE_SYSLEN_IN_UTMPX | |
767 | /* ut_syslen is the length of the utx_host string */ | |
768 | utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host)); | |
769 | # endif | |
770 | } | |
771 | #endif /* USE_UTMPX || USE_WTMPX */ | |
772 | ||
773 | /** | |
774 | ** Low-level utmp functions | |
775 | **/ | |
776 | ||
777 | /* FIXME: (ATL) utmp_write_direct needs testing */ | |
778 | #ifdef USE_UTMP | |
779 | ||
780 | /* if we can, use pututline() etc. */ | |
781 | # if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \ | |
782 | defined(HAVE_PUTUTLINE) | |
783 | # define UTMP_USE_LIBRARY | |
784 | # endif | |
785 | ||
786 | ||
787 | /* write a utmp entry with the system's help (pututline() and pals) */ | |
788 | # ifdef UTMP_USE_LIBRARY | |
789 | static int | |
790 | utmp_write_library(struct logininfo *li, struct utmp *ut) | |
791 | { | |
792 | setutent(); | |
793 | pututline(ut); | |
794 | # ifdef HAVE_ENDUTENT | |
795 | endutent(); | |
796 | # endif | |
797 | return (1); | |
798 | } | |
799 | # else /* UTMP_USE_LIBRARY */ | |
800 | ||
801 | /* | |
802 | * Write a utmp entry direct to the file | |
803 | * This is a slightly modification of code in OpenBSD's login.c | |
804 | */ | |
805 | static int | |
806 | utmp_write_direct(struct logininfo *li, struct utmp *ut) | |
807 | { | |
808 | struct utmp old_ut; | |
809 | register int fd; | |
810 | int tty; | |
811 | ||
812 | /* FIXME: (ATL) ttyslot() needs local implementation */ | |
813 | ||
814 | #if defined(HAVE_GETTTYENT) | |
815 | struct ttyent *ty; | |
816 | ||
817 | tty=0; | |
818 | setttyent(); | |
819 | while (NULL != (ty = getttyent())) { | |
820 | tty++; | |
821 | if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line))) | |
822 | break; | |
823 | } | |
824 | endttyent(); | |
825 | ||
826 | if (NULL == ty) { | |
827 | logit("%s: tty not found", __func__); | |
828 | return (0); | |
829 | } | |
830 | #else /* FIXME */ | |
831 | ||
832 | tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */ | |
833 | ||
834 | #endif /* HAVE_GETTTYENT */ | |
835 | ||
836 | if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) { | |
837 | off_t pos, ret; | |
838 | ||
839 | pos = (off_t)tty * sizeof(struct utmp); | |
840 | if ((ret = lseek(fd, pos, SEEK_SET)) == -1) { | |
841 | logit("%s: lseek: %s", __func__, strerror(errno)); | |
842 | return (0); | |
843 | } | |
844 | if (ret != pos) { | |
845 | logit("%s: Couldn't seek to tty %d slot in %s", | |
846 | __func__, tty, UTMP_FILE); | |
847 | return (0); | |
848 | } | |
849 | /* | |
850 | * Prevent luser from zero'ing out ut_host. | |
851 | * If the new ut_line is empty but the old one is not | |
852 | * and ut_line and ut_name match, preserve the old ut_line. | |
853 | */ | |
854 | if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) && | |
855 | (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') && | |
856 | (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) && | |
857 | (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) | |
858 | memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host)); | |
859 | ||
860 | if ((ret = lseek(fd, pos, SEEK_SET)) == -1) { | |
861 | logit("%s: lseek: %s", __func__, strerror(errno)); | |
862 | return (0); | |
863 | } | |
864 | if (ret != pos) { | |
865 | logit("%s: Couldn't seek to tty %d slot in %s", | |
866 | __func__, tty, UTMP_FILE); | |
867 | return (0); | |
868 | } | |
869 | if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) { | |
870 | logit("%s: error writing %s: %s", __func__, | |
871 | UTMP_FILE, strerror(errno)); | |
872 | } | |
873 | ||
874 | close(fd); | |
875 | return (1); | |
876 | } else { | |
877 | return (0); | |
878 | } | |
879 | } | |
880 | # endif /* UTMP_USE_LIBRARY */ | |
881 | ||
882 | static int | |
883 | utmp_perform_login(struct logininfo *li) | |
884 | { | |
885 | struct utmp ut; | |
886 | ||
887 | construct_utmp(li, &ut); | |
888 | # ifdef UTMP_USE_LIBRARY | |
889 | if (!utmp_write_library(li, &ut)) { | |
890 | logit("%s: utmp_write_library() failed", __func__); | |
891 | return (0); | |
892 | } | |
893 | # else | |
894 | if (!utmp_write_direct(li, &ut)) { | |
895 | logit("%s: utmp_write_direct() failed", __func__); | |
896 | return (0); | |
897 | } | |
898 | # endif | |
899 | return (1); | |
900 | } | |
901 | ||
902 | ||
903 | static int | |
904 | utmp_perform_logout(struct logininfo *li) | |
905 | { | |
906 | struct utmp ut; | |
907 | ||
908 | construct_utmp(li, &ut); | |
909 | # ifdef UTMP_USE_LIBRARY | |
910 | if (!utmp_write_library(li, &ut)) { | |
911 | logit("%s: utmp_write_library() failed", __func__); | |
912 | return (0); | |
913 | } | |
914 | # else | |
915 | if (!utmp_write_direct(li, &ut)) { | |
916 | logit("%s: utmp_write_direct() failed", __func__); | |
917 | return (0); | |
918 | } | |
919 | # endif | |
920 | return (1); | |
921 | } | |
922 | ||
923 | ||
924 | int | |
925 | utmp_write_entry(struct logininfo *li) | |
926 | { | |
927 | switch(li->type) { | |
928 | case LTYPE_LOGIN: | |
929 | return (utmp_perform_login(li)); | |
930 | ||
931 | case LTYPE_LOGOUT: | |
932 | return (utmp_perform_logout(li)); | |
933 | ||
934 | default: | |
935 | logit("%s: invalid type field", __func__); | |
936 | return (0); | |
937 | } | |
938 | } | |
939 | #endif /* USE_UTMP */ | |
940 | ||
941 | ||
942 | /** | |
943 | ** Low-level utmpx functions | |
944 | **/ | |
945 | ||
946 | /* not much point if we don't want utmpx entries */ | |
947 | #ifdef USE_UTMPX | |
948 | ||
949 | /* if we have the wherewithall, use pututxline etc. */ | |
950 | # if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \ | |
951 | defined(HAVE_PUTUTXLINE) | |
952 | # define UTMPX_USE_LIBRARY | |
953 | # endif | |
954 | ||
955 | ||
956 | /* write a utmpx entry with the system's help (pututxline() and pals) */ | |
957 | # ifdef UTMPX_USE_LIBRARY | |
958 | static int | |
959 | utmpx_write_library(struct logininfo *li, struct utmpx *utx) | |
960 | { | |
961 | setutxent(); | |
962 | pututxline(utx); | |
963 | ||
964 | # ifdef HAVE_ENDUTXENT | |
965 | endutxent(); | |
966 | # endif | |
967 | return (1); | |
968 | } | |
969 | ||
970 | # else /* UTMPX_USE_LIBRARY */ | |
971 | ||
972 | /* write a utmp entry direct to the file */ | |
973 | static int | |
974 | utmpx_write_direct(struct logininfo *li, struct utmpx *utx) | |
975 | { | |
976 | logit("%s: not implemented!", __func__); | |
977 | return (0); | |
978 | } | |
979 | # endif /* UTMPX_USE_LIBRARY */ | |
980 | ||
981 | static int | |
982 | utmpx_perform_login(struct logininfo *li) | |
983 | { | |
984 | struct utmpx utx; | |
985 | ||
986 | construct_utmpx(li, &utx); | |
987 | # ifdef UTMPX_USE_LIBRARY | |
988 | if (!utmpx_write_library(li, &utx)) { | |
989 | logit("%s: utmp_write_library() failed", __func__); | |
990 | return (0); | |
991 | } | |
992 | # else | |
993 | if (!utmpx_write_direct(li, &ut)) { | |
994 | logit("%s: utmp_write_direct() failed", __func__); | |
995 | return (0); | |
996 | } | |
997 | # endif | |
998 | return (1); | |
999 | } | |
1000 | ||
1001 | ||
1002 | static int | |
1003 | utmpx_perform_logout(struct logininfo *li) | |
1004 | { | |
1005 | struct utmpx utx; | |
1006 | ||
1007 | construct_utmpx(li, &utx); | |
1008 | # ifdef HAVE_ID_IN_UTMPX | |
1009 | line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id)); | |
1010 | # endif | |
1011 | # ifdef HAVE_TYPE_IN_UTMPX | |
1012 | utx.ut_type = DEAD_PROCESS; | |
1013 | # endif | |
1014 | ||
1015 | # ifdef UTMPX_USE_LIBRARY | |
1016 | utmpx_write_library(li, &utx); | |
1017 | # else | |
1018 | utmpx_write_direct(li, &utx); | |
1019 | # endif | |
1020 | return (1); | |
1021 | } | |
1022 | ||
1023 | int | |
1024 | utmpx_write_entry(struct logininfo *li) | |
1025 | { | |
1026 | switch(li->type) { | |
1027 | case LTYPE_LOGIN: | |
1028 | return (utmpx_perform_login(li)); | |
1029 | case LTYPE_LOGOUT: | |
1030 | return (utmpx_perform_logout(li)); | |
1031 | default: | |
1032 | logit("%s: invalid type field", __func__); | |
1033 | return (0); | |
1034 | } | |
1035 | } | |
1036 | #endif /* USE_UTMPX */ | |
1037 | ||
1038 | ||
1039 | /** | |
1040 | ** Low-level wtmp functions | |
1041 | **/ | |
1042 | ||
1043 | #ifdef USE_WTMP | |
1044 | ||
1045 | /* | |
1046 | * Write a wtmp entry direct to the end of the file | |
1047 | * This is a slight modification of code in OpenBSD's logwtmp.c | |
1048 | */ | |
1049 | static int | |
1050 | wtmp_write(struct logininfo *li, struct utmp *ut) | |
1051 | { | |
1052 | struct stat buf; | |
1053 | int fd, ret = 1; | |
1054 | ||
1055 | if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
1056 | logit("%s: problem writing %s: %s", __func__, | |
1057 | WTMP_FILE, strerror(errno)); | |
1058 | return (0); | |
1059 | } | |
1060 | if (fstat(fd, &buf) == 0) | |
1061 | if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) { | |
1062 | ftruncate(fd, buf.st_size); | |
1063 | logit("%s: problem writing %s: %s", __func__, | |
1064 | WTMP_FILE, strerror(errno)); | |
1065 | ret = 0; | |
1066 | } | |
1067 | close(fd); | |
1068 | return (ret); | |
1069 | } | |
1070 | ||
1071 | static int | |
1072 | wtmp_perform_login(struct logininfo *li) | |
1073 | { | |
1074 | struct utmp ut; | |
1075 | ||
1076 | construct_utmp(li, &ut); | |
1077 | return (wtmp_write(li, &ut)); | |
1078 | } | |
1079 | ||
1080 | ||
1081 | static int | |
1082 | wtmp_perform_logout(struct logininfo *li) | |
1083 | { | |
1084 | struct utmp ut; | |
1085 | ||
1086 | construct_utmp(li, &ut); | |
1087 | return (wtmp_write(li, &ut)); | |
1088 | } | |
1089 | ||
1090 | ||
1091 | int | |
1092 | wtmp_write_entry(struct logininfo *li) | |
1093 | { | |
1094 | switch(li->type) { | |
1095 | case LTYPE_LOGIN: | |
1096 | return (wtmp_perform_login(li)); | |
1097 | case LTYPE_LOGOUT: | |
1098 | return (wtmp_perform_logout(li)); | |
1099 | default: | |
1100 | logit("%s: invalid type field", __func__); | |
1101 | return (0); | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | ||
1106 | /* | |
1107 | * Notes on fetching login data from wtmp/wtmpx | |
1108 | * | |
1109 | * Logouts are usually recorded with (amongst other things) a blank | |
1110 | * username on a given tty line. However, some systems (HP-UX is one) | |
1111 | * leave all fields set, but change the ut_type field to DEAD_PROCESS. | |
1112 | * | |
1113 | * Since we're only looking for logins here, we know that the username | |
1114 | * must be set correctly. On systems that leave it in, we check for | |
1115 | * ut_type==USER_PROCESS (indicating a login.) | |
1116 | * | |
1117 | * Portability: Some systems may set something other than USER_PROCESS | |
1118 | * to indicate a login process. I don't know of any as I write. Also, | |
1119 | * it's possible that some systems may both leave the username in | |
1120 | * place and not have ut_type. | |
1121 | */ | |
1122 | ||
1123 | /* return true if this wtmp entry indicates a login */ | |
1124 | static int | |
1125 | wtmp_islogin(struct logininfo *li, struct utmp *ut) | |
1126 | { | |
1127 | if (strncmp(li->username, ut->ut_name, | |
1128 | MIN_SIZEOF(li->username, ut->ut_name)) == 0) { | |
1129 | # ifdef HAVE_TYPE_IN_UTMP | |
1130 | if (ut->ut_type & USER_PROCESS) | |
1131 | return (1); | |
1132 | # else | |
1133 | return (1); | |
1134 | # endif | |
1135 | } | |
1136 | return (0); | |
1137 | } | |
1138 | ||
1139 | int | |
1140 | wtmp_get_entry(struct logininfo *li) | |
1141 | { | |
1142 | struct stat st; | |
1143 | struct utmp ut; | |
1144 | int fd, found = 0; | |
1145 | ||
1146 | /* Clear the time entries in our logininfo */ | |
1147 | li->tv_sec = li->tv_usec = 0; | |
1148 | ||
1149 | if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) { | |
1150 | logit("%s: problem opening %s: %s", __func__, | |
1151 | WTMP_FILE, strerror(errno)); | |
1152 | return (0); | |
1153 | } | |
1154 | if (fstat(fd, &st) != 0) { | |
1155 | logit("%s: couldn't stat %s: %s", __func__, | |
1156 | WTMP_FILE, strerror(errno)); | |
1157 | close(fd); | |
1158 | return (0); | |
1159 | } | |
1160 | ||
1161 | /* Seek to the start of the last struct utmp */ | |
1162 | if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) { | |
1163 | /* Looks like we've got a fresh wtmp file */ | |
1164 | close(fd); | |
1165 | return (0); | |
1166 | } | |
1167 | ||
1168 | while (!found) { | |
1169 | if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) { | |
1170 | logit("%s: read of %s failed: %s", __func__, | |
1171 | WTMP_FILE, strerror(errno)); | |
1172 | close (fd); | |
1173 | return (0); | |
1174 | } | |
1175 | if ( wtmp_islogin(li, &ut) ) { | |
1176 | found = 1; | |
1177 | /* | |
1178 | * We've already checked for a time in struct | |
1179 | * utmp, in login_getlast() | |
1180 | */ | |
1181 | # ifdef HAVE_TIME_IN_UTMP | |
1182 | li->tv_sec = ut.ut_time; | |
1183 | # else | |
1184 | # if HAVE_TV_IN_UTMP | |
1185 | li->tv_sec = ut.ut_tv.tv_sec; | |
1186 | # endif | |
1187 | # endif | |
1188 | line_fullname(li->line, ut.ut_line, | |
1189 | MIN_SIZEOF(li->line, ut.ut_line)); | |
1190 | # ifdef HAVE_HOST_IN_UTMP | |
1191 | strlcpy(li->hostname, ut.ut_host, | |
1192 | MIN_SIZEOF(li->hostname, ut.ut_host)); | |
1193 | # endif | |
1194 | continue; | |
1195 | } | |
1196 | /* Seek back 2 x struct utmp */ | |
1197 | if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) { | |
1198 | /* We've found the start of the file, so quit */ | |
1199 | close(fd); | |
1200 | return (0); | |
1201 | } | |
1202 | } | |
1203 | ||
1204 | /* We found an entry. Tidy up and return */ | |
1205 | close(fd); | |
1206 | return (1); | |
1207 | } | |
1208 | # endif /* USE_WTMP */ | |
1209 | ||
1210 | ||
1211 | /** | |
1212 | ** Low-level wtmpx functions | |
1213 | **/ | |
1214 | ||
1215 | #ifdef USE_WTMPX | |
1216 | /* | |
1217 | * Write a wtmpx entry direct to the end of the file | |
1218 | * This is a slight modification of code in OpenBSD's logwtmp.c | |
1219 | */ | |
1220 | static int | |
1221 | wtmpx_write(struct logininfo *li, struct utmpx *utx) | |
1222 | { | |
1223 | #ifndef HAVE_UPDWTMPX | |
1224 | struct stat buf; | |
1225 | int fd, ret = 1; | |
1226 | ||
1227 | if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
1228 | logit("%s: problem opening %s: %s", __func__, | |
1229 | WTMPX_FILE, strerror(errno)); | |
1230 | return (0); | |
1231 | } | |
1232 | ||
1233 | if (fstat(fd, &buf) == 0) | |
1234 | if (atomicio(vwrite, fd, utx, sizeof(*utx)) != sizeof(*utx)) { | |
1235 | ftruncate(fd, buf.st_size); | |
1236 | logit("%s: problem writing %s: %s", __func__, | |
1237 | WTMPX_FILE, strerror(errno)); | |
1238 | ret = 0; | |
1239 | } | |
1240 | close(fd); | |
1241 | ||
1242 | return (ret); | |
1243 | #else | |
1244 | updwtmpx(WTMPX_FILE, utx); | |
1245 | return (1); | |
1246 | #endif | |
1247 | } | |
1248 | ||
1249 | ||
1250 | static int | |
1251 | wtmpx_perform_login(struct logininfo *li) | |
1252 | { | |
1253 | struct utmpx utx; | |
1254 | ||
1255 | construct_utmpx(li, &utx); | |
1256 | return (wtmpx_write(li, &utx)); | |
1257 | } | |
1258 | ||
1259 | ||
1260 | static int | |
1261 | wtmpx_perform_logout(struct logininfo *li) | |
1262 | { | |
1263 | struct utmpx utx; | |
1264 | ||
1265 | construct_utmpx(li, &utx); | |
1266 | return (wtmpx_write(li, &utx)); | |
1267 | } | |
1268 | ||
1269 | ||
1270 | int | |
1271 | wtmpx_write_entry(struct logininfo *li) | |
1272 | { | |
1273 | switch(li->type) { | |
1274 | case LTYPE_LOGIN: | |
1275 | return (wtmpx_perform_login(li)); | |
1276 | case LTYPE_LOGOUT: | |
1277 | return (wtmpx_perform_logout(li)); | |
1278 | default: | |
1279 | logit("%s: invalid type field", __func__); | |
1280 | return (0); | |
1281 | } | |
1282 | } | |
1283 | ||
1284 | /* Please see the notes above wtmp_islogin() for information about the | |
1285 | next two functions */ | |
1286 | ||
1287 | /* Return true if this wtmpx entry indicates a login */ | |
1288 | static int | |
1289 | wtmpx_islogin(struct logininfo *li, struct utmpx *utx) | |
1290 | { | |
1291 | if (strncmp(li->username, utx->ut_name, | |
1292 | MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) { | |
1293 | # ifdef HAVE_TYPE_IN_UTMPX | |
1294 | if (utx->ut_type == USER_PROCESS) | |
1295 | return (1); | |
1296 | # else | |
1297 | return (1); | |
1298 | # endif | |
1299 | } | |
1300 | return (0); | |
1301 | } | |
1302 | ||
1303 | ||
1304 | int | |
1305 | wtmpx_get_entry(struct logininfo *li) | |
1306 | { | |
1307 | struct stat st; | |
1308 | struct utmpx utx; | |
1309 | int fd, found=0; | |
1310 | ||
1311 | /* Clear the time entries */ | |
1312 | li->tv_sec = li->tv_usec = 0; | |
1313 | ||
1314 | if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) { | |
1315 | logit("%s: problem opening %s: %s", __func__, | |
1316 | WTMPX_FILE, strerror(errno)); | |
1317 | return (0); | |
1318 | } | |
1319 | if (fstat(fd, &st) != 0) { | |
1320 | logit("%s: couldn't stat %s: %s", __func__, | |
1321 | WTMPX_FILE, strerror(errno)); | |
1322 | close(fd); | |
1323 | return (0); | |
1324 | } | |
1325 | ||
1326 | /* Seek to the start of the last struct utmpx */ | |
1327 | if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) { | |
1328 | /* probably a newly rotated wtmpx file */ | |
1329 | close(fd); | |
1330 | return (0); | |
1331 | } | |
1332 | ||
1333 | while (!found) { | |
1334 | if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) { | |
1335 | logit("%s: read of %s failed: %s", __func__, | |
1336 | WTMPX_FILE, strerror(errno)); | |
1337 | close (fd); | |
1338 | return (0); | |
1339 | } | |
1340 | /* | |
1341 | * Logouts are recorded as a blank username on a particular | |
1342 | * line. So, we just need to find the username in struct utmpx | |
1343 | */ | |
1344 | if (wtmpx_islogin(li, &utx)) { | |
1345 | found = 1; | |
1346 | # if defined(HAVE_TV_IN_UTMPX) | |
1347 | li->tv_sec = utx.ut_tv.tv_sec; | |
1348 | # elif defined(HAVE_TIME_IN_UTMPX) | |
1349 | li->tv_sec = utx.ut_time; | |
1350 | # endif | |
1351 | line_fullname(li->line, utx.ut_line, sizeof(li->line)); | |
1352 | # if defined(HAVE_HOST_IN_UTMPX) | |
1353 | strlcpy(li->hostname, utx.ut_host, | |
1354 | MIN_SIZEOF(li->hostname, utx.ut_host)); | |
1355 | # endif | |
1356 | continue; | |
1357 | } | |
1358 | if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) { | |
1359 | close(fd); | |
1360 | return (0); | |
1361 | } | |
1362 | } | |
1363 | ||
1364 | close(fd); | |
1365 | return (1); | |
1366 | } | |
1367 | #endif /* USE_WTMPX */ | |
1368 | ||
1369 | /** | |
1370 | ** Low-level libutil login() functions | |
1371 | **/ | |
1372 | ||
1373 | #ifdef USE_LOGIN | |
1374 | static int | |
1375 | syslogin_perform_login(struct logininfo *li) | |
1376 | { | |
1377 | struct utmp *ut; | |
1378 | ||
1379 | ut = xmalloc(sizeof(*ut)); | |
1380 | construct_utmp(li, ut); | |
1381 | login(ut); | |
1382 | free(ut); | |
1383 | ||
1384 | return (1); | |
1385 | } | |
1386 | ||
1387 | static int | |
1388 | syslogin_perform_logout(struct logininfo *li) | |
1389 | { | |
1390 | # ifdef HAVE_LOGOUT | |
1391 | char line[UT_LINESIZE]; | |
1392 | ||
1393 | (void)line_stripname(line, li->line, sizeof(line)); | |
1394 | ||
1395 | if (!logout(line)) | |
1396 | logit("%s: logout() returned an error", __func__); | |
1397 | # ifdef HAVE_LOGWTMP | |
1398 | else | |
1399 | logwtmp(line, "", ""); | |
1400 | # endif | |
1401 | /* FIXME: (ATL - if the need arises) What to do if we have | |
1402 | * login, but no logout? what if logout but no logwtmp? All | |
1403 | * routines are in libutil so they should all be there, | |
1404 | * but... */ | |
1405 | # endif | |
1406 | return (1); | |
1407 | } | |
1408 | ||
1409 | int | |
1410 | syslogin_write_entry(struct logininfo *li) | |
1411 | { | |
1412 | switch (li->type) { | |
1413 | case LTYPE_LOGIN: | |
1414 | return (syslogin_perform_login(li)); | |
1415 | case LTYPE_LOGOUT: | |
1416 | return (syslogin_perform_logout(li)); | |
1417 | default: | |
1418 | logit("%s: Invalid type field", __func__); | |
1419 | return (0); | |
1420 | } | |
1421 | } | |
1422 | #endif /* USE_LOGIN */ | |
1423 | ||
1424 | /* end of file log-syslogin.c */ | |
1425 | ||
1426 | /** | |
1427 | ** Low-level lastlog functions | |
1428 | **/ | |
1429 | ||
1430 | #ifdef USE_LASTLOG | |
1431 | #define LL_FILE 1 | |
1432 | #define LL_DIR 2 | |
1433 | #define LL_OTHER 3 | |
1434 | ||
1435 | static void | |
1436 | lastlog_construct(struct logininfo *li, struct lastlog *last) | |
1437 | { | |
1438 | /* clear the structure */ | |
1439 | memset(last, '\0', sizeof(*last)); | |
1440 | ||
1441 | line_stripname(last->ll_line, li->line, sizeof(last->ll_line)); | |
1442 | strlcpy(last->ll_host, li->hostname, | |
1443 | MIN_SIZEOF(last->ll_host, li->hostname)); | |
1444 | last->ll_time = li->tv_sec; | |
1445 | } | |
1446 | ||
1447 | static int | |
1448 | lastlog_filetype(char *filename) | |
1449 | { | |
1450 | struct stat st; | |
1451 | ||
1452 | if (stat(LASTLOG_FILE, &st) != 0) { | |
1453 | logit("%s: Couldn't stat %s: %s", __func__, | |
1454 | LASTLOG_FILE, strerror(errno)); | |
1455 | return (0); | |
1456 | } | |
1457 | if (S_ISDIR(st.st_mode)) | |
1458 | return (LL_DIR); | |
1459 | else if (S_ISREG(st.st_mode)) | |
1460 | return (LL_FILE); | |
1461 | else | |
1462 | return (LL_OTHER); | |
1463 | } | |
1464 | ||
1465 | ||
1466 | /* open the file (using filemode) and seek to the login entry */ | |
1467 | static int | |
1468 | lastlog_openseek(struct logininfo *li, int *fd, int filemode) | |
1469 | { | |
1470 | off_t offset; | |
1471 | int type; | |
1472 | char lastlog_file[1024]; | |
1473 | ||
1474 | type = lastlog_filetype(LASTLOG_FILE); | |
1475 | switch (type) { | |
1476 | case LL_FILE: | |
1477 | strlcpy(lastlog_file, LASTLOG_FILE, | |
1478 | sizeof(lastlog_file)); | |
1479 | break; | |
1480 | case LL_DIR: | |
1481 | snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s", | |
1482 | LASTLOG_FILE, li->username); | |
1483 | break; | |
1484 | default: | |
1485 | logit("%s: %.100s is not a file or directory!", __func__, | |
1486 | LASTLOG_FILE); | |
1487 | return (0); | |
1488 | } | |
1489 | ||
1490 | *fd = open(lastlog_file, filemode, 0600); | |
1491 | if (*fd < 0) { | |
1492 | debug("%s: Couldn't open %s: %s", __func__, | |
1493 | lastlog_file, strerror(errno)); | |
1494 | return (0); | |
1495 | } | |
1496 | ||
1497 | if (type == LL_FILE) { | |
1498 | /* find this uid's offset in the lastlog file */ | |
1499 | offset = (off_t) ((long)li->uid * sizeof(struct lastlog)); | |
1500 | ||
1501 | if (lseek(*fd, offset, SEEK_SET) != offset) { | |
1502 | logit("%s: %s->lseek(): %s", __func__, | |
1503 | lastlog_file, strerror(errno)); | |
1504 | return (0); | |
1505 | } | |
1506 | } | |
1507 | ||
1508 | return (1); | |
1509 | } | |
1510 | ||
1511 | static int | |
1512 | lastlog_perform_login(struct logininfo *li) | |
1513 | { | |
1514 | struct lastlog last; | |
1515 | int fd; | |
1516 | ||
1517 | /* create our struct lastlog */ | |
1518 | lastlog_construct(li, &last); | |
1519 | ||
1520 | if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT)) | |
1521 | return (0); | |
1522 | ||
1523 | /* write the entry */ | |
1524 | if (atomicio(vwrite, fd, &last, sizeof(last)) != sizeof(last)) { | |
1525 | close(fd); | |
1526 | logit("%s: Error writing to %s: %s", __func__, | |
1527 | LASTLOG_FILE, strerror(errno)); | |
1528 | return (0); | |
1529 | } | |
1530 | ||
1531 | close(fd); | |
1532 | return (1); | |
1533 | } | |
1534 | ||
1535 | int | |
1536 | lastlog_write_entry(struct logininfo *li) | |
1537 | { | |
1538 | switch(li->type) { | |
1539 | case LTYPE_LOGIN: | |
1540 | return (lastlog_perform_login(li)); | |
1541 | default: | |
1542 | logit("%s: Invalid type field", __func__); | |
1543 | return (0); | |
1544 | } | |
1545 | } | |
1546 | ||
1547 | static void | |
1548 | lastlog_populate_entry(struct logininfo *li, struct lastlog *last) | |
1549 | { | |
1550 | line_fullname(li->line, last->ll_line, sizeof(li->line)); | |
1551 | strlcpy(li->hostname, last->ll_host, | |
1552 | MIN_SIZEOF(li->hostname, last->ll_host)); | |
1553 | li->tv_sec = last->ll_time; | |
1554 | } | |
1555 | ||
1556 | int | |
1557 | lastlog_get_entry(struct logininfo *li) | |
1558 | { | |
1559 | struct lastlog last; | |
1560 | int fd, ret; | |
1561 | ||
1562 | if (!lastlog_openseek(li, &fd, O_RDONLY)) | |
1563 | return (0); | |
1564 | ||
1565 | ret = atomicio(read, fd, &last, sizeof(last)); | |
1566 | close(fd); | |
1567 | ||
1568 | switch (ret) { | |
1569 | case 0: | |
1570 | memset(&last, '\0', sizeof(last)); | |
1571 | /* FALLTHRU */ | |
1572 | case sizeof(last): | |
1573 | lastlog_populate_entry(li, &last); | |
1574 | return (1); | |
1575 | case -1: | |
1576 | error("%s: Error reading from %s: %s", __func__, | |
1577 | LASTLOG_FILE, strerror(errno)); | |
1578 | return (0); | |
1579 | default: | |
1580 | error("%s: Error reading from %s: Expecting %d, got %d", | |
1581 | __func__, LASTLOG_FILE, sizeof(last), ret); | |
1582 | return (0); | |
1583 | } | |
1584 | ||
1585 | /* NOTREACHED */ | |
1586 | return (0); | |
1587 | } | |
1588 | #endif /* USE_LASTLOG */ | |
1589 | ||
1590 | #ifdef USE_BTMP | |
1591 | /* | |
1592 | * Logs failed login attempts in _PATH_BTMP if that exists. | |
1593 | * The most common login failure is to give password instead of username. | |
1594 | * So the _PATH_BTMP file checked for the correct permission, so that | |
1595 | * only root can read it. | |
1596 | */ | |
1597 | ||
1598 | void | |
1599 | record_failed_login(const char *username, const char *hostname, | |
1600 | const char *ttyn) | |
1601 | { | |
1602 | int fd; | |
1603 | struct utmp ut; | |
1604 | struct sockaddr_storage from; | |
1605 | size_t fromlen = sizeof(from); | |
1606 | struct sockaddr_in *a4; | |
1607 | struct sockaddr_in6 *a6; | |
1608 | time_t t; | |
1609 | struct stat fst; | |
1610 | ||
1611 | if (geteuid() != 0) | |
1612 | return; | |
1613 | if ((fd = open(_PATH_BTMP, O_WRONLY | O_APPEND)) < 0) { | |
1614 | debug("Unable to open the btmp file %s: %s", _PATH_BTMP, | |
1615 | strerror(errno)); | |
1616 | return; | |
1617 | } | |
1618 | if (fstat(fd, &fst) < 0) { | |
1619 | logit("%s: fstat of %s failed: %s", __func__, _PATH_BTMP, | |
1620 | strerror(errno)); | |
1621 | goto out; | |
1622 | } | |
1623 | if((fst.st_mode & (S_IRWXG | S_IRWXO)) || (fst.st_uid != 0)){ | |
1624 | logit("Excess permission or bad ownership on file %s", | |
1625 | _PATH_BTMP); | |
1626 | goto out; | |
1627 | } | |
1628 | ||
1629 | memset(&ut, 0, sizeof(ut)); | |
1630 | /* strncpy because we don't necessarily want nul termination */ | |
1631 | strncpy(ut.ut_user, username, sizeof(ut.ut_user)); | |
1632 | strlcpy(ut.ut_line, "ssh:notty", sizeof(ut.ut_line)); | |
1633 | ||
1634 | time(&t); | |
1635 | ut.ut_time = t; /* ut_time is not always a time_t */ | |
1636 | ut.ut_type = LOGIN_PROCESS; | |
1637 | ut.ut_pid = getpid(); | |
1638 | ||
1639 | /* strncpy because we don't necessarily want nul termination */ | |
1640 | strncpy(ut.ut_host, hostname, sizeof(ut.ut_host)); | |
1641 | ||
1642 | if (packet_connection_is_on_socket() && | |
1643 | getpeername(packet_get_connection_in(), | |
1644 | (struct sockaddr *)&from, &fromlen) == 0) { | |
1645 | ipv64_normalise_mapped(&from, &fromlen); | |
1646 | if (from.ss_family == AF_INET) { | |
1647 | a4 = (struct sockaddr_in *)&from; | |
1648 | memcpy(&ut.ut_addr, &(a4->sin_addr), | |
1649 | MIN_SIZEOF(ut.ut_addr, a4->sin_addr)); | |
1650 | } | |
1651 | #ifdef HAVE_ADDR_V6_IN_UTMP | |
1652 | if (from.ss_family == AF_INET6) { | |
1653 | a6 = (struct sockaddr_in6 *)&from; | |
1654 | memcpy(&ut.ut_addr_v6, &(a6->sin6_addr), | |
1655 | MIN_SIZEOF(ut.ut_addr_v6, a6->sin6_addr)); | |
1656 | } | |
1657 | #endif | |
1658 | } | |
1659 | ||
1660 | if (atomicio(vwrite, fd, &ut, sizeof(ut)) != sizeof(ut)) | |
1661 | error("Failed to write to %s: %s", _PATH_BTMP, | |
1662 | strerror(errno)); | |
1663 | ||
1664 | out: | |
1665 | close(fd); | |
1666 | } | |
1667 | #endif /* USE_BTMP */ |