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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 | ** loginrec.c: platform-independent login recording and lastlog retrieval | |
30 | **/ | |
31 | ||
32 | /* | |
33 | The new login code explained | |
34 | ============================ | |
35 | ||
36 | This code attempts to provide a common interface to login recording | |
37 | (utmp and friends) and last login time retrieval. | |
38 | ||
39 | Its primary means of achieving this is to use 'struct logininfo', a | |
40 | union of all the useful fields in the various different types of | |
41 | system login record structures one finds on UNIX variants. | |
42 | ||
43 | We depend on autoconf to define which recording methods are to be | |
44 | used, and which fields are contained in the relevant data structures | |
45 | on the local system. Many C preprocessor symbols affect which code | |
46 | gets compiled here. | |
47 | ||
48 | The code is designed to make it easy to modify a particular | |
49 | recording method, without affecting other methods nor requiring so | |
50 | many nested conditional compilation blocks as were commonplace in | |
51 | the old code. | |
52 | ||
53 | For login recording, we try to use the local system's libraries as | |
54 | these are clearly most likely to work correctly. For utmp systems | |
55 | this usually means login() and logout() or setutent() etc., probably | |
56 | in libutil, along with logwtmp() etc. On these systems, we fall back | |
57 | to writing the files directly if we have to, though this method | |
58 | requires very thorough testing so we do not corrupt local auditing | |
59 | information. These files and their access methods are very system | |
60 | specific indeed. | |
61 | ||
62 | For utmpx systems, the corresponding library functions are | |
63 | setutxent() etc. To the author's knowledge, all utmpx systems have | |
64 | these library functions and so no direct write is attempted. If such | |
65 | a system exists and needs support, direct analogues of the [uw]tmp | |
66 | code should suffice. | |
67 | ||
68 | Retrieving the time of last login ('lastlog') is in some ways even | |
69 | more problemmatic than login recording. Some systems provide a | |
70 | simple table of all users which we seek based on uid and retrieve a | |
71 | relatively standard structure. Others record the same information in | |
72 | a directory with a separate file, and others don't record the | |
73 | information separately at all. For systems in the latter category, | |
74 | we look backwards in the wtmp or wtmpx file for the last login entry | |
75 | for our user. Naturally this is slower and on busy systems could | |
76 | incur a significant performance penalty. | |
77 | ||
78 | Calling the new code | |
79 | -------------------- | |
80 | ||
81 | In OpenSSH all login recording and retrieval is performed in | |
82 | login.c. Here you'll find working examples. Also, in the logintest.c | |
83 | program there are more examples. | |
84 | ||
85 | Internal handler calling method | |
86 | ------------------------------- | |
87 | ||
88 | When a call is made to login_login() or login_logout(), both | |
89 | routines set a struct logininfo flag defining which action (log in, | |
90 | or log out) is to be taken. They both then call login_write(), which | |
91 | calls whichever of the many structure-specific handlers autoconf | |
92 | selects for the local system. | |
93 | ||
94 | The handlers themselves handle system data structure specifics. Both | |
95 | struct utmp and struct utmpx have utility functions (see | |
96 | construct_utmp*()) to try to make it simpler to add extra systems | |
97 | that introduce new features to either structure. | |
98 | ||
99 | While it may seem terribly wasteful to replicate so much similar | |
100 | code for each method, experience has shown that maintaining code to | |
101 | write both struct utmp and utmpx in one function, whilst maintaining | |
102 | support for all systems whether they have library support or not, is | |
103 | a difficult and time-consuming task. | |
104 | ||
105 | Lastlog support proceeds similarly. Functions login_get_lastlog() | |
106 | (and its OpenSSH-tuned friend login_get_lastlog_time()) call | |
107 | getlast_entry(), which tries one of three methods to find the last | |
108 | login time. It uses local system lastlog support if it can, | |
109 | otherwise it tries wtmp or wtmpx before giving up and returning 0, | |
110 | meaning "tilt". | |
111 | ||
112 | Maintenance | |
113 | ----------- | |
114 | ||
115 | In many cases it's possible to tweak autoconf to select the correct | |
116 | methods for a particular platform, either by improving the detection | |
117 | code (best), or by presetting DISABLE_<method> or CONF_<method>_FILE | |
118 | symbols for the platform. | |
119 | ||
120 | Use logintest to check which symbols are defined before modifying | |
121 | configure.ac and loginrec.c. (You have to build logintest yourself | |
122 | with 'make logintest' as it's not built by default.) | |
123 | ||
124 | Otherwise, patches to the specific method(s) are very helpful! | |
125 | ||
126 | */ | |
127 | ||
128 | /** | |
129 | ** TODO: | |
130 | ** homegrown ttyslot() | |
131 | ** test, test, test | |
132 | ** | |
133 | ** Platform status: | |
134 | ** ---------------- | |
135 | ** | |
136 | ** Known good: | |
137 | ** Linux (Redhat 6.2, Debian) | |
138 | ** Solaris | |
139 | ** HP-UX 10.20 (gcc only) | |
140 | ** IRIX | |
141 | ** NeXT - M68k/HPPA/Sparc (4.2/3.3) | |
142 | ** | |
143 | ** Testing required: Please send reports! | |
144 | ** NetBSD | |
145 | ** HP-UX 11 | |
146 | ** AIX | |
147 | ** | |
148 | ** Platforms with known problems: | |
149 | ** Some variants of Slackware Linux | |
150 | ** | |
151 | **/ | |
152 | ||
153 | #include "includes.h" | |
154 | ||
155 | #include "ssh.h" | |
156 | #include "xmalloc.h" | |
157 | #include "loginrec.h" | |
158 | #include "log.h" | |
159 | #include "atomicio.h" | |
160 | ||
161 | RCSID("$Id$"); | |
162 | ||
163 | #ifdef HAVE_UTIL_H | |
164 | # include <util.h> | |
165 | #endif | |
166 | ||
167 | #ifdef HAVE_LIBUTIL_H | |
168 | # include <libutil.h> | |
169 | #endif | |
170 | ||
171 | /** | |
172 | ** prototypes for helper functions in this file | |
173 | **/ | |
174 | ||
175 | #if HAVE_UTMP_H | |
176 | void set_utmp_time(struct logininfo *li, struct utmp *ut); | |
177 | void construct_utmp(struct logininfo *li, struct utmp *ut); | |
178 | #endif | |
179 | ||
180 | #ifdef HAVE_UTMPX_H | |
181 | void set_utmpx_time(struct logininfo *li, struct utmpx *ut); | |
182 | void construct_utmpx(struct logininfo *li, struct utmpx *ut); | |
183 | #endif | |
184 | ||
185 | int utmp_write_entry(struct logininfo *li); | |
186 | int utmpx_write_entry(struct logininfo *li); | |
187 | int wtmp_write_entry(struct logininfo *li); | |
188 | int wtmpx_write_entry(struct logininfo *li); | |
189 | int lastlog_write_entry(struct logininfo *li); | |
190 | int syslogin_write_entry(struct logininfo *li); | |
191 | ||
192 | int getlast_entry(struct logininfo *li); | |
193 | int lastlog_get_entry(struct logininfo *li); | |
194 | int wtmp_get_entry(struct logininfo *li); | |
195 | int wtmpx_get_entry(struct logininfo *li); | |
196 | ||
197 | /* pick the shortest string */ | |
198 | #define MIN_SIZEOF(s1,s2) ( sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2) ) | |
199 | ||
200 | /** | |
201 | ** platform-independent login functions | |
202 | **/ | |
203 | ||
204 | /* login_login(struct logininfo *) -Record a login | |
205 | * | |
206 | * Call with a pointer to a struct logininfo initialised with | |
207 | * login_init_entry() or login_alloc_entry() | |
208 | * | |
209 | * Returns: | |
210 | * >0 if successful | |
211 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
212 | */ | |
213 | int | |
214 | login_login (struct logininfo *li) | |
215 | { | |
216 | li->type = LTYPE_LOGIN; | |
217 | return login_write(li); | |
218 | } | |
219 | ||
220 | ||
221 | /* login_logout(struct logininfo *) - Record a logout | |
222 | * | |
223 | * Call as with login_login() | |
224 | * | |
225 | * Returns: | |
226 | * >0 if successful | |
227 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
228 | */ | |
229 | int | |
230 | login_logout(struct logininfo *li) | |
231 | { | |
232 | li->type = LTYPE_LOGOUT; | |
233 | return login_write(li); | |
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 | /* login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry | |
265 | * | |
266 | * Retrieve a logininfo structure populated (only partially) with | |
267 | * information from the system lastlog data, or from wtmp/wtmpx if no | |
268 | * system lastlog information exists. | |
269 | * | |
270 | * Note this routine must be given a pre-allocated logininfo. | |
271 | * | |
272 | * Returns: | |
273 | * >0: A pointer to your struct logininfo if successful | |
274 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
275 | * | |
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("login_get_lastlog: Cannot find account for uid %i", uid); | |
293 | ||
294 | /* No MIN_SIZEOF here - we absolutely *must not* truncate the | |
295 | * username */ | |
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 | /* login_alloc_entry(int, char*, char*, char*) - Allocate and initialise | |
306 | * a logininfo structure | |
307 | * | |
308 | * This function creates a new struct logininfo, a data structure | |
309 | * meant to carry the information required to portably record login info. | |
310 | * | |
311 | * Returns a pointer to a newly created struct logininfo. If memory | |
312 | * allocation fails, the program halts. | |
313 | */ | |
314 | struct | |
315 | logininfo *login_alloc_entry(int pid, const char *username, | |
316 | const char *hostname, const char *line) | |
317 | { | |
318 | struct logininfo *newli; | |
319 | ||
320 | newli = (struct logininfo *) xmalloc (sizeof(*newli)); | |
321 | (void)login_init_entry(newli, pid, username, hostname, line); | |
322 | return newli; | |
323 | } | |
324 | ||
325 | ||
326 | /* login_free_entry(struct logininfo *) - free struct memory */ | |
327 | void | |
328 | login_free_entry(struct logininfo *li) | |
329 | { | |
330 | xfree(li); | |
331 | } | |
332 | ||
333 | ||
334 | /* login_init_entry(struct logininfo *, int, char*, char*, char*) | |
335 | * - initialise a struct logininfo | |
336 | * | |
337 | * Populates a new struct logininfo, a data structure meant to carry | |
338 | * the information required to portably record login info. | |
339 | * | |
340 | * Returns: 1 | |
341 | */ | |
342 | int | |
343 | login_init_entry(struct logininfo *li, int pid, const char *username, | |
344 | const char *hostname, const char *line) | |
345 | { | |
346 | struct passwd *pw; | |
347 | ||
348 | memset(li, 0, sizeof(*li)); | |
349 | ||
350 | li->pid = pid; | |
351 | ||
352 | /* set the line information */ | |
353 | if (line) | |
354 | line_fullname(li->line, line, sizeof(li->line)); | |
355 | ||
356 | if (username) { | |
357 | strlcpy(li->username, username, sizeof(li->username)); | |
358 | pw = getpwnam(li->username); | |
359 | if (pw == NULL) | |
360 | fatal("login_init_entry: Cannot find user \"%s\"", li->username); | |
361 | li->uid = pw->pw_uid; | |
362 | } | |
363 | ||
364 | if (hostname) | |
365 | strlcpy(li->hostname, hostname, sizeof(li->hostname)); | |
366 | ||
367 | return 1; | |
368 | } | |
369 | ||
370 | /* login_set_current_time(struct logininfo *) - set the current time | |
371 | * | |
372 | * Set the current time in a logininfo structure. This function is | |
373 | * meant to eliminate the need to deal with system dependencies for | |
374 | * time handling. | |
375 | */ | |
376 | void | |
377 | login_set_current_time(struct logininfo *li) | |
378 | { | |
379 | struct timeval tv; | |
380 | ||
381 | gettimeofday(&tv, NULL); | |
382 | ||
383 | li->tv_sec = tv.tv_sec; | |
384 | li->tv_usec = tv.tv_usec; | |
385 | } | |
386 | ||
387 | /* copy a sockaddr_* into our logininfo */ | |
388 | void | |
389 | login_set_addr(struct logininfo *li, const struct sockaddr *sa, | |
390 | const unsigned int sa_size) | |
391 | { | |
392 | unsigned int bufsize = sa_size; | |
393 | ||
394 | /* make sure we don't overrun our union */ | |
395 | if (sizeof(li->hostaddr) < sa_size) | |
396 | bufsize = sizeof(li->hostaddr); | |
397 | ||
398 | memcpy((void *)&(li->hostaddr.sa), (const void *)sa, bufsize); | |
399 | } | |
400 | ||
401 | ||
402 | /** | |
403 | ** login_write: Call low-level recording functions based on autoconf | |
404 | ** results | |
405 | **/ | |
406 | int | |
407 | login_write (struct logininfo *li) | |
408 | { | |
409 | #ifndef HAVE_CYGWIN | |
410 | if ((int)geteuid() != 0) { | |
411 | logit("Attempt to write login records by non-root user (aborting)"); | |
412 | return 1; | |
413 | } | |
414 | #endif | |
415 | ||
416 | /* set the timestamp */ | |
417 | login_set_current_time(li); | |
418 | #ifdef USE_LOGIN | |
419 | syslogin_write_entry(li); | |
420 | #endif | |
421 | #ifdef USE_LASTLOG | |
422 | if (li->type == LTYPE_LOGIN) { | |
423 | lastlog_write_entry(li); | |
424 | } | |
425 | #endif | |
426 | #ifdef USE_UTMP | |
427 | utmp_write_entry(li); | |
428 | #endif | |
429 | #ifdef USE_WTMP | |
430 | wtmp_write_entry(li); | |
431 | #endif | |
432 | #ifdef USE_UTMPX | |
433 | utmpx_write_entry(li); | |
434 | #endif | |
435 | #ifdef USE_WTMPX | |
436 | wtmpx_write_entry(li); | |
437 | #endif | |
438 | return 0; | |
439 | } | |
440 | ||
441 | #ifdef LOGIN_NEEDS_UTMPX | |
442 | int | |
443 | login_utmp_only(struct logininfo *li) | |
444 | { | |
445 | li->type = LTYPE_LOGIN; | |
446 | login_set_current_time(li); | |
447 | # ifdef USE_UTMP | |
448 | utmp_write_entry(li); | |
449 | # endif | |
450 | # ifdef USE_WTMP | |
451 | wtmp_write_entry(li); | |
452 | # endif | |
453 | # ifdef USE_UTMPX | |
454 | utmpx_write_entry(li); | |
455 | # endif | |
456 | # ifdef USE_WTMPX | |
457 | wtmpx_write_entry(li); | |
458 | # endif | |
459 | return 0; | |
460 | } | |
461 | #endif | |
462 | ||
463 | /** | |
464 | ** getlast_entry: Call low-level functions to retrieve the last login | |
465 | ** time. | |
466 | **/ | |
467 | ||
468 | /* take the uid in li and return the last login time */ | |
469 | int | |
470 | getlast_entry(struct logininfo *li) | |
471 | { | |
472 | #ifdef USE_LASTLOG | |
473 | return(lastlog_get_entry(li)); | |
474 | #else /* !USE_LASTLOG */ | |
475 | ||
476 | #ifdef DISABLE_LASTLOG | |
477 | /* On some systems we shouldn't even try to obtain last login | |
478 | * time, e.g. AIX */ | |
479 | return 0; | |
480 | # else /* DISABLE_LASTLOG */ | |
481 | /* Try to retrieve the last login time from wtmp */ | |
482 | # if defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) | |
483 | /* retrieve last login time from utmp */ | |
484 | return (wtmp_get_entry(li)); | |
485 | # else /* defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) */ | |
486 | /* If wtmp isn't available, try wtmpx */ | |
487 | # if defined(USE_WTMPX) && (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX)) | |
488 | /* retrieve last login time from utmpx */ | |
489 | return (wtmpx_get_entry(li)); | |
490 | # else | |
491 | /* Give up: No means of retrieving last login time */ | |
492 | return 0; | |
493 | # endif /* USE_WTMPX && (HAVE_TIME_IN_UTMPX || HAVE_TV_IN_UTMPX) */ | |
494 | # endif /* USE_WTMP && (HAVE_TIME_IN_UTMP || HAVE_TV_IN_UTMP) */ | |
495 | # endif /* DISABLE_LASTLOG */ | |
496 | #endif /* USE_LASTLOG */ | |
497 | } | |
498 | ||
499 | ||
500 | ||
501 | /* | |
502 | * 'line' string utility functions | |
503 | * | |
504 | * These functions process the 'line' string into one of three forms: | |
505 | * | |
506 | * 1. The full filename (including '/dev') | |
507 | * 2. The stripped name (excluding '/dev') | |
508 | * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00 | |
509 | * /dev/pts/1 -> ts/1 ) | |
510 | * | |
511 | * Form 3 is used on some systems to identify a .tmp.? entry when | |
512 | * attempting to remove it. Typically both addition and removal is | |
513 | * performed by one application - say, sshd - so as long as the choice | |
514 | * uniquely identifies a terminal it's ok. | |
515 | */ | |
516 | ||
517 | ||
518 | /* line_fullname(): add the leading '/dev/' if it doesn't exist make | |
519 | * sure dst has enough space, if not just copy src (ugh) */ | |
520 | char * | |
521 | line_fullname(char *dst, const char *src, int dstsize) | |
522 | { | |
523 | memset(dst, '\0', dstsize); | |
524 | if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) { | |
525 | strlcpy(dst, src, dstsize); | |
526 | } else { | |
527 | strlcpy(dst, "/dev/", dstsize); | |
528 | strlcat(dst, src, dstsize); | |
529 | } | |
530 | return dst; | |
531 | } | |
532 | ||
533 | /* line_stripname(): strip the leading '/dev' if it exists, return dst */ | |
534 | char * | |
535 | line_stripname(char *dst, const char *src, int dstsize) | |
536 | { | |
537 | memset(dst, '\0', dstsize); | |
538 | if (strncmp(src, "/dev/", 5) == 0) | |
539 | strlcpy(dst, src + 5, dstsize); | |
540 | else | |
541 | strlcpy(dst, src, dstsize); | |
542 | return dst; | |
543 | } | |
544 | ||
545 | /* line_abbrevname(): Return the abbreviated (usually four-character) | |
546 | * form of the line (Just use the last <dstsize> characters of the | |
547 | * full name.) | |
548 | * | |
549 | * NOTE: use strncpy because we do NOT necessarily want zero | |
550 | * termination */ | |
551 | char * | |
552 | line_abbrevname(char *dst, const char *src, int dstsize) | |
553 | { | |
554 | size_t len; | |
555 | ||
556 | memset(dst, '\0', dstsize); | |
557 | ||
558 | /* Always skip prefix if present */ | |
559 | if (strncmp(src, "/dev/", 5) == 0) | |
560 | src += 5; | |
561 | ||
562 | #ifdef WITH_ABBREV_NO_TTY | |
563 | if (strncmp(src, "tty", 3) == 0) | |
564 | src += 3; | |
565 | #endif | |
566 | ||
567 | len = strlen(src); | |
568 | ||
569 | if (len > 0) { | |
570 | if (((int)len - dstsize) > 0) | |
571 | src += ((int)len - dstsize); | |
572 | ||
573 | /* note: _don't_ change this to strlcpy */ | |
574 | strncpy(dst, src, (size_t)dstsize); | |
575 | } | |
576 | ||
577 | return dst; | |
578 | } | |
579 | ||
580 | /** | |
581 | ** utmp utility functions | |
582 | ** | |
583 | ** These functions manipulate struct utmp, taking system differences | |
584 | ** into account. | |
585 | **/ | |
586 | ||
587 | #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN) | |
588 | ||
589 | /* build the utmp structure */ | |
590 | void | |
591 | set_utmp_time(struct logininfo *li, struct utmp *ut) | |
592 | { | |
593 | # ifdef HAVE_TV_IN_UTMP | |
594 | ut->ut_tv.tv_sec = li->tv_sec; | |
595 | ut->ut_tv.tv_usec = li->tv_usec; | |
596 | # else | |
597 | # ifdef HAVE_TIME_IN_UTMP | |
598 | ut->ut_time = li->tv_sec; | |
599 | # endif | |
600 | # endif | |
601 | } | |
602 | ||
603 | void | |
604 | construct_utmp(struct logininfo *li, | |
605 | struct utmp *ut) | |
606 | { | |
607 | # ifdef HAVE_ADDR_V6_IN_UTMP | |
608 | struct sockaddr_in6 *sa6; | |
609 | # endif | |
610 | memset(ut, '\0', sizeof(*ut)); | |
611 | ||
612 | /* First fill out fields used for both logins and logouts */ | |
613 | ||
614 | # ifdef HAVE_ID_IN_UTMP | |
615 | line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id)); | |
616 | # endif | |
617 | ||
618 | # ifdef HAVE_TYPE_IN_UTMP | |
619 | /* This is done here to keep utmp constants out of struct logininfo */ | |
620 | switch (li->type) { | |
621 | case LTYPE_LOGIN: | |
622 | ut->ut_type = USER_PROCESS; | |
623 | #ifdef _UNICOS | |
624 | cray_set_tmpdir(ut); | |
625 | #endif | |
626 | break; | |
627 | case LTYPE_LOGOUT: | |
628 | ut->ut_type = DEAD_PROCESS; | |
629 | #ifdef _UNICOS | |
630 | cray_retain_utmp(ut, li->pid); | |
631 | #endif | |
632 | break; | |
633 | } | |
634 | # endif | |
635 | set_utmp_time(li, ut); | |
636 | ||
637 | line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line)); | |
638 | ||
639 | # ifdef HAVE_PID_IN_UTMP | |
640 | ut->ut_pid = li->pid; | |
641 | # endif | |
642 | ||
643 | /* If we're logging out, leave all other fields blank */ | |
644 | if (li->type == LTYPE_LOGOUT) | |
645 | return; | |
646 | ||
647 | /* | |
648 | * These fields are only used when logging in, and are blank | |
649 | * for logouts. | |
650 | */ | |
651 | ||
652 | /* Use strncpy because we don't necessarily want null termination */ | |
653 | strncpy(ut->ut_name, li->username, MIN_SIZEOF(ut->ut_name, li->username)); | |
654 | # ifdef HAVE_HOST_IN_UTMP | |
655 | strncpy(ut->ut_host, li->hostname, MIN_SIZEOF(ut->ut_host, li->hostname)); | |
656 | # endif | |
657 | # ifdef HAVE_ADDR_IN_UTMP | |
658 | /* this is just a 32-bit IP address */ | |
659 | if (li->hostaddr.sa.sa_family == AF_INET) | |
660 | ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
661 | # endif | |
662 | # ifdef HAVE_ADDR_V6_IN_UTMP | |
663 | /* this is just a 128-bit IPv6 address */ | |
664 | if (li->hostaddr.sa.sa_family == AF_INET6) { | |
665 | sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa); | |
666 | memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16); | |
667 | if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) { | |
668 | ut->ut_addr_v6[0] = ut->ut_addr_v6[3]; | |
669 | ut->ut_addr_v6[1] = 0; | |
670 | ut->ut_addr_v6[2] = 0; | |
671 | ut->ut_addr_v6[3] = 0; | |
672 | } | |
673 | } | |
674 | # endif | |
675 | } | |
676 | #endif /* USE_UTMP || USE_WTMP || USE_LOGIN */ | |
677 | ||
678 | /** | |
679 | ** utmpx utility functions | |
680 | ** | |
681 | ** These functions manipulate struct utmpx, accounting for system | |
682 | ** variations. | |
683 | **/ | |
684 | ||
685 | #if defined(USE_UTMPX) || defined (USE_WTMPX) | |
686 | /* build the utmpx structure */ | |
687 | void | |
688 | set_utmpx_time(struct logininfo *li, struct utmpx *utx) | |
689 | { | |
690 | # ifdef HAVE_TV_IN_UTMPX | |
691 | utx->ut_tv.tv_sec = li->tv_sec; | |
692 | utx->ut_tv.tv_usec = li->tv_usec; | |
693 | # else /* HAVE_TV_IN_UTMPX */ | |
694 | # ifdef HAVE_TIME_IN_UTMPX | |
695 | utx->ut_time = li->tv_sec; | |
696 | # endif /* HAVE_TIME_IN_UTMPX */ | |
697 | # endif /* HAVE_TV_IN_UTMPX */ | |
698 | } | |
699 | ||
700 | void | |
701 | construct_utmpx(struct logininfo *li, struct utmpx *utx) | |
702 | { | |
703 | # ifdef HAVE_ADDR_V6_IN_UTMP | |
704 | struct sockaddr_in6 *sa6; | |
705 | # endif | |
706 | memset(utx, '\0', sizeof(*utx)); | |
707 | # ifdef HAVE_ID_IN_UTMPX | |
708 | line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id)); | |
709 | # endif | |
710 | ||
711 | /* this is done here to keep utmp constants out of loginrec.h */ | |
712 | switch (li->type) { | |
713 | case LTYPE_LOGIN: | |
714 | utx->ut_type = USER_PROCESS; | |
715 | break; | |
716 | case LTYPE_LOGOUT: | |
717 | utx->ut_type = DEAD_PROCESS; | |
718 | break; | |
719 | } | |
720 | line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line)); | |
721 | set_utmpx_time(li, utx); | |
722 | utx->ut_pid = li->pid; | |
723 | /* strncpy(): Don't necessarily want null termination */ | |
724 | strncpy(utx->ut_name, li->username, MIN_SIZEOF(utx->ut_name, li->username)); | |
725 | ||
726 | if (li->type == LTYPE_LOGOUT) | |
727 | return; | |
728 | ||
729 | /* | |
730 | * These fields are only used when logging in, and are blank | |
731 | * for logouts. | |
732 | */ | |
733 | ||
734 | # ifdef HAVE_HOST_IN_UTMPX | |
735 | strncpy(utx->ut_host, li->hostname, MIN_SIZEOF(utx->ut_host, li->hostname)); | |
736 | # endif | |
737 | # ifdef HAVE_ADDR_IN_UTMPX | |
738 | /* this is just a 32-bit IP address */ | |
739 | if (li->hostaddr.sa.sa_family == AF_INET) | |
740 | utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
741 | # endif | |
742 | # ifdef HAVE_ADDR_V6_IN_UTMP | |
743 | /* this is just a 128-bit IPv6 address */ | |
744 | if (li->hostaddr.sa.sa_family == AF_INET6) { | |
745 | sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa); | |
746 | memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16); | |
747 | if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) { | |
748 | ut->ut_addr_v6[0] = ut->ut_addr_v6[3]; | |
749 | ut->ut_addr_v6[1] = 0; | |
750 | ut->ut_addr_v6[2] = 0; | |
751 | ut->ut_addr_v6[3] = 0; | |
752 | } | |
753 | } | |
754 | # endif | |
755 | # ifdef HAVE_SYSLEN_IN_UTMPX | |
756 | /* ut_syslen is the length of the utx_host string */ | |
757 | utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host)); | |
758 | # endif | |
759 | } | |
760 | #endif /* USE_UTMPX || USE_WTMPX */ | |
761 | ||
762 | /** | |
763 | ** Low-level utmp functions | |
764 | **/ | |
765 | ||
766 | /* FIXME: (ATL) utmp_write_direct needs testing */ | |
767 | #ifdef USE_UTMP | |
768 | ||
769 | /* if we can, use pututline() etc. */ | |
770 | # if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \ | |
771 | defined(HAVE_PUTUTLINE) | |
772 | # define UTMP_USE_LIBRARY | |
773 | # endif | |
774 | ||
775 | ||
776 | /* write a utmp entry with the system's help (pututline() and pals) */ | |
777 | # ifdef UTMP_USE_LIBRARY | |
778 | static int | |
779 | utmp_write_library(struct logininfo *li, struct utmp *ut) | |
780 | { | |
781 | setutent(); | |
782 | pututline(ut); | |
783 | ||
784 | # ifdef HAVE_ENDUTENT | |
785 | endutent(); | |
786 | # endif | |
787 | return 1; | |
788 | } | |
789 | # else /* UTMP_USE_LIBRARY */ | |
790 | ||
791 | /* write a utmp entry direct to the file */ | |
792 | /* This is a slightly modification of code in OpenBSD's login.c */ | |
793 | static int | |
794 | utmp_write_direct(struct logininfo *li, struct utmp *ut) | |
795 | { | |
796 | struct utmp old_ut; | |
797 | register int fd; | |
798 | int tty; | |
799 | ||
800 | /* FIXME: (ATL) ttyslot() needs local implementation */ | |
801 | ||
802 | #if defined(HAVE_GETTTYENT) | |
803 | register struct ttyent *ty; | |
804 | ||
805 | tty=0; | |
806 | ||
807 | setttyent(); | |
808 | while ((struct ttyent *)0 != (ty = getttyent())) { | |
809 | tty++; | |
810 | if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line))) | |
811 | break; | |
812 | } | |
813 | endttyent(); | |
814 | ||
815 | if((struct ttyent *)0 == ty) { | |
816 | logit("utmp_write_entry: tty not found"); | |
817 | return(1); | |
818 | } | |
819 | #else /* FIXME */ | |
820 | ||
821 | tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */ | |
822 | ||
823 | #endif /* HAVE_GETTTYENT */ | |
824 | ||
825 | if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) { | |
826 | (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET); | |
827 | /* | |
828 | * Prevent luser from zero'ing out ut_host. | |
829 | * If the new ut_line is empty but the old one is not | |
830 | * and ut_line and ut_name match, preserve the old ut_line. | |
831 | */ | |
832 | if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) && | |
833 | (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') && | |
834 | (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) && | |
835 | (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) { | |
836 | (void)memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host)); | |
837 | } | |
838 | ||
839 | (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET); | |
840 | if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) | |
841 | logit("utmp_write_direct: error writing %s: %s", | |
842 | UTMP_FILE, strerror(errno)); | |
843 | ||
844 | (void)close(fd); | |
845 | return 1; | |
846 | } else { | |
847 | return 0; | |
848 | } | |
849 | } | |
850 | # endif /* UTMP_USE_LIBRARY */ | |
851 | ||
852 | static int | |
853 | utmp_perform_login(struct logininfo *li) | |
854 | { | |
855 | struct utmp ut; | |
856 | ||
857 | construct_utmp(li, &ut); | |
858 | # ifdef UTMP_USE_LIBRARY | |
859 | if (!utmp_write_library(li, &ut)) { | |
860 | logit("utmp_perform_login: utmp_write_library() failed"); | |
861 | return 0; | |
862 | } | |
863 | # else | |
864 | if (!utmp_write_direct(li, &ut)) { | |
865 | logit("utmp_perform_login: utmp_write_direct() failed"); | |
866 | return 0; | |
867 | } | |
868 | # endif | |
869 | return 1; | |
870 | } | |
871 | ||
872 | ||
873 | static int | |
874 | utmp_perform_logout(struct logininfo *li) | |
875 | { | |
876 | struct utmp ut; | |
877 | ||
878 | construct_utmp(li, &ut); | |
879 | # ifdef UTMP_USE_LIBRARY | |
880 | if (!utmp_write_library(li, &ut)) { | |
881 | logit("utmp_perform_logout: utmp_write_library() failed"); | |
882 | return 0; | |
883 | } | |
884 | # else | |
885 | if (!utmp_write_direct(li, &ut)) { | |
886 | logit("utmp_perform_logout: utmp_write_direct() failed"); | |
887 | return 0; | |
888 | } | |
889 | # endif | |
890 | return 1; | |
891 | } | |
892 | ||
893 | ||
894 | int | |
895 | utmp_write_entry(struct logininfo *li) | |
896 | { | |
897 | switch(li->type) { | |
898 | case LTYPE_LOGIN: | |
899 | return utmp_perform_login(li); | |
900 | ||
901 | case LTYPE_LOGOUT: | |
902 | return utmp_perform_logout(li); | |
903 | ||
904 | default: | |
905 | logit("utmp_write_entry: invalid type field"); | |
906 | return 0; | |
907 | } | |
908 | } | |
909 | #endif /* USE_UTMP */ | |
910 | ||
911 | ||
912 | /** | |
913 | ** Low-level utmpx functions | |
914 | **/ | |
915 | ||
916 | /* not much point if we don't want utmpx entries */ | |
917 | #ifdef USE_UTMPX | |
918 | ||
919 | /* if we have the wherewithall, use pututxline etc. */ | |
920 | # if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \ | |
921 | defined(HAVE_PUTUTXLINE) | |
922 | # define UTMPX_USE_LIBRARY | |
923 | # endif | |
924 | ||
925 | ||
926 | /* write a utmpx entry with the system's help (pututxline() and pals) */ | |
927 | # ifdef UTMPX_USE_LIBRARY | |
928 | static int | |
929 | utmpx_write_library(struct logininfo *li, struct utmpx *utx) | |
930 | { | |
931 | setutxent(); | |
932 | pututxline(utx); | |
933 | ||
934 | # ifdef HAVE_ENDUTXENT | |
935 | endutxent(); | |
936 | # endif | |
937 | return 1; | |
938 | } | |
939 | ||
940 | # else /* UTMPX_USE_LIBRARY */ | |
941 | ||
942 | /* write a utmp entry direct to the file */ | |
943 | static int | |
944 | utmpx_write_direct(struct logininfo *li, struct utmpx *utx) | |
945 | { | |
946 | logit("utmpx_write_direct: not implemented!"); | |
947 | return 0; | |
948 | } | |
949 | # endif /* UTMPX_USE_LIBRARY */ | |
950 | ||
951 | static int | |
952 | utmpx_perform_login(struct logininfo *li) | |
953 | { | |
954 | struct utmpx utx; | |
955 | ||
956 | construct_utmpx(li, &utx); | |
957 | # ifdef UTMPX_USE_LIBRARY | |
958 | if (!utmpx_write_library(li, &utx)) { | |
959 | logit("utmpx_perform_login: utmp_write_library() failed"); | |
960 | return 0; | |
961 | } | |
962 | # else | |
963 | if (!utmpx_write_direct(li, &ut)) { | |
964 | logit("utmpx_perform_login: utmp_write_direct() failed"); | |
965 | return 0; | |
966 | } | |
967 | # endif | |
968 | return 1; | |
969 | } | |
970 | ||
971 | ||
972 | static int | |
973 | utmpx_perform_logout(struct logininfo *li) | |
974 | { | |
975 | struct utmpx utx; | |
976 | ||
977 | construct_utmpx(li, &utx); | |
978 | # ifdef HAVE_ID_IN_UTMPX | |
979 | line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id)); | |
980 | # endif | |
981 | # ifdef HAVE_TYPE_IN_UTMPX | |
982 | utx.ut_type = DEAD_PROCESS; | |
983 | # endif | |
984 | ||
985 | # ifdef UTMPX_USE_LIBRARY | |
986 | utmpx_write_library(li, &utx); | |
987 | # else | |
988 | utmpx_write_direct(li, &utx); | |
989 | # endif | |
990 | return 1; | |
991 | } | |
992 | ||
993 | int | |
994 | utmpx_write_entry(struct logininfo *li) | |
995 | { | |
996 | switch(li->type) { | |
997 | case LTYPE_LOGIN: | |
998 | return utmpx_perform_login(li); | |
999 | case LTYPE_LOGOUT: | |
1000 | return utmpx_perform_logout(li); | |
1001 | default: | |
1002 | logit("utmpx_write_entry: invalid type field"); | |
1003 | return 0; | |
1004 | } | |
1005 | } | |
1006 | #endif /* USE_UTMPX */ | |
1007 | ||
1008 | ||
1009 | /** | |
1010 | ** Low-level wtmp functions | |
1011 | **/ | |
1012 | ||
1013 | #ifdef USE_WTMP | |
1014 | ||
1015 | /* write a wtmp entry direct to the end of the file */ | |
1016 | /* This is a slight modification of code in OpenBSD's logwtmp.c */ | |
1017 | static int | |
1018 | wtmp_write(struct logininfo *li, struct utmp *ut) | |
1019 | { | |
1020 | struct stat buf; | |
1021 | int fd, ret = 1; | |
1022 | ||
1023 | if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
1024 | logit("wtmp_write: problem writing %s: %s", | |
1025 | WTMP_FILE, strerror(errno)); | |
1026 | return 0; | |
1027 | } | |
1028 | if (fstat(fd, &buf) == 0) | |
1029 | if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) { | |
1030 | ftruncate(fd, buf.st_size); | |
1031 | logit("wtmp_write: problem writing %s: %s", | |
1032 | WTMP_FILE, strerror(errno)); | |
1033 | ret = 0; | |
1034 | } | |
1035 | (void)close(fd); | |
1036 | return ret; | |
1037 | } | |
1038 | ||
1039 | static int | |
1040 | wtmp_perform_login(struct logininfo *li) | |
1041 | { | |
1042 | struct utmp ut; | |
1043 | ||
1044 | construct_utmp(li, &ut); | |
1045 | return wtmp_write(li, &ut); | |
1046 | } | |
1047 | ||
1048 | ||
1049 | static int | |
1050 | wtmp_perform_logout(struct logininfo *li) | |
1051 | { | |
1052 | struct utmp ut; | |
1053 | ||
1054 | construct_utmp(li, &ut); | |
1055 | return wtmp_write(li, &ut); | |
1056 | } | |
1057 | ||
1058 | ||
1059 | int | |
1060 | wtmp_write_entry(struct logininfo *li) | |
1061 | { | |
1062 | switch(li->type) { | |
1063 | case LTYPE_LOGIN: | |
1064 | return wtmp_perform_login(li); | |
1065 | case LTYPE_LOGOUT: | |
1066 | return wtmp_perform_logout(li); | |
1067 | default: | |
1068 | logit("wtmp_write_entry: invalid type field"); | |
1069 | return 0; | |
1070 | } | |
1071 | } | |
1072 | ||
1073 | ||
1074 | /* Notes on fetching login data from wtmp/wtmpx | |
1075 | * | |
1076 | * Logouts are usually recorded with (amongst other things) a blank | |
1077 | * username on a given tty line. However, some systems (HP-UX is one) | |
1078 | * leave all fields set, but change the ut_type field to DEAD_PROCESS. | |
1079 | * | |
1080 | * Since we're only looking for logins here, we know that the username | |
1081 | * must be set correctly. On systems that leave it in, we check for | |
1082 | * ut_type==USER_PROCESS (indicating a login.) | |
1083 | * | |
1084 | * Portability: Some systems may set something other than USER_PROCESS | |
1085 | * to indicate a login process. I don't know of any as I write. Also, | |
1086 | * it's possible that some systems may both leave the username in | |
1087 | * place and not have ut_type. | |
1088 | */ | |
1089 | ||
1090 | /* return true if this wtmp entry indicates a login */ | |
1091 | static int | |
1092 | wtmp_islogin(struct logininfo *li, struct utmp *ut) | |
1093 | { | |
1094 | if (strncmp(li->username, ut->ut_name, | |
1095 | MIN_SIZEOF(li->username, ut->ut_name)) == 0) { | |
1096 | # ifdef HAVE_TYPE_IN_UTMP | |
1097 | if (ut->ut_type & USER_PROCESS) | |
1098 | return 1; | |
1099 | # else | |
1100 | return 1; | |
1101 | # endif | |
1102 | } | |
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | int | |
1107 | wtmp_get_entry(struct logininfo *li) | |
1108 | { | |
1109 | struct stat st; | |
1110 | struct utmp ut; | |
1111 | int fd, found=0; | |
1112 | ||
1113 | /* Clear the time entries in our logininfo */ | |
1114 | li->tv_sec = li->tv_usec = 0; | |
1115 | ||
1116 | if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) { | |
1117 | logit("wtmp_get_entry: problem opening %s: %s", | |
1118 | WTMP_FILE, strerror(errno)); | |
1119 | return 0; | |
1120 | } | |
1121 | if (fstat(fd, &st) != 0) { | |
1122 | logit("wtmp_get_entry: couldn't stat %s: %s", | |
1123 | WTMP_FILE, strerror(errno)); | |
1124 | close(fd); | |
1125 | return 0; | |
1126 | } | |
1127 | ||
1128 | /* Seek to the start of the last struct utmp */ | |
1129 | if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) { | |
1130 | /* Looks like we've got a fresh wtmp file */ | |
1131 | close(fd); | |
1132 | return 0; | |
1133 | } | |
1134 | ||
1135 | while (!found) { | |
1136 | if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) { | |
1137 | logit("wtmp_get_entry: read of %s failed: %s", | |
1138 | WTMP_FILE, strerror(errno)); | |
1139 | close (fd); | |
1140 | return 0; | |
1141 | } | |
1142 | if ( wtmp_islogin(li, &ut) ) { | |
1143 | found = 1; | |
1144 | /* We've already checked for a time in struct | |
1145 | * utmp, in login_getlast(). */ | |
1146 | # ifdef HAVE_TIME_IN_UTMP | |
1147 | li->tv_sec = ut.ut_time; | |
1148 | # else | |
1149 | # if HAVE_TV_IN_UTMP | |
1150 | li->tv_sec = ut.ut_tv.tv_sec; | |
1151 | # endif | |
1152 | # endif | |
1153 | line_fullname(li->line, ut.ut_line, | |
1154 | MIN_SIZEOF(li->line, ut.ut_line)); | |
1155 | # ifdef HAVE_HOST_IN_UTMP | |
1156 | strlcpy(li->hostname, ut.ut_host, | |
1157 | MIN_SIZEOF(li->hostname, ut.ut_host)); | |
1158 | # endif | |
1159 | continue; | |
1160 | } | |
1161 | /* Seek back 2 x struct utmp */ | |
1162 | if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) { | |
1163 | /* We've found the start of the file, so quit */ | |
1164 | close (fd); | |
1165 | return 0; | |
1166 | } | |
1167 | } | |
1168 | ||
1169 | /* We found an entry. Tidy up and return */ | |
1170 | close(fd); | |
1171 | return 1; | |
1172 | } | |
1173 | # endif /* USE_WTMP */ | |
1174 | ||
1175 | ||
1176 | /** | |
1177 | ** Low-level wtmpx functions | |
1178 | **/ | |
1179 | ||
1180 | #ifdef USE_WTMPX | |
1181 | /* write a wtmpx entry direct to the end of the file */ | |
1182 | /* This is a slight modification of code in OpenBSD's logwtmp.c */ | |
1183 | static int | |
1184 | wtmpx_write(struct logininfo *li, struct utmpx *utx) | |
1185 | { | |
1186 | struct stat buf; | |
1187 | int fd, ret = 1; | |
1188 | ||
1189 | if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
1190 | logit("wtmpx_write: problem opening %s: %s", | |
1191 | WTMPX_FILE, strerror(errno)); | |
1192 | return 0; | |
1193 | } | |
1194 | ||
1195 | if (fstat(fd, &buf) == 0) | |
1196 | if (atomicio(vwrite, fd, utx, sizeof(*utx)) != sizeof(*utx)) { | |
1197 | ftruncate(fd, buf.st_size); | |
1198 | logit("wtmpx_write: problem writing %s: %s", | |
1199 | WTMPX_FILE, strerror(errno)); | |
1200 | ret = 0; | |
1201 | } | |
1202 | (void)close(fd); | |
1203 | ||
1204 | return ret; | |
1205 | } | |
1206 | ||
1207 | ||
1208 | static int | |
1209 | wtmpx_perform_login(struct logininfo *li) | |
1210 | { | |
1211 | struct utmpx utx; | |
1212 | ||
1213 | construct_utmpx(li, &utx); | |
1214 | return wtmpx_write(li, &utx); | |
1215 | } | |
1216 | ||
1217 | ||
1218 | static int | |
1219 | wtmpx_perform_logout(struct logininfo *li) | |
1220 | { | |
1221 | struct utmpx utx; | |
1222 | ||
1223 | construct_utmpx(li, &utx); | |
1224 | return wtmpx_write(li, &utx); | |
1225 | } | |
1226 | ||
1227 | ||
1228 | int | |
1229 | wtmpx_write_entry(struct logininfo *li) | |
1230 | { | |
1231 | switch(li->type) { | |
1232 | case LTYPE_LOGIN: | |
1233 | return wtmpx_perform_login(li); | |
1234 | case LTYPE_LOGOUT: | |
1235 | return wtmpx_perform_logout(li); | |
1236 | default: | |
1237 | logit("wtmpx_write_entry: invalid type field"); | |
1238 | return 0; | |
1239 | } | |
1240 | } | |
1241 | ||
1242 | /* Please see the notes above wtmp_islogin() for information about the | |
1243 | next two functions */ | |
1244 | ||
1245 | /* Return true if this wtmpx entry indicates a login */ | |
1246 | static int | |
1247 | wtmpx_islogin(struct logininfo *li, struct utmpx *utx) | |
1248 | { | |
1249 | if ( strncmp(li->username, utx->ut_name, | |
1250 | MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) { | |
1251 | # ifdef HAVE_TYPE_IN_UTMPX | |
1252 | if (utx->ut_type == USER_PROCESS) | |
1253 | return 1; | |
1254 | # else | |
1255 | return 1; | |
1256 | # endif | |
1257 | } | |
1258 | return 0; | |
1259 | } | |
1260 | ||
1261 | ||
1262 | int | |
1263 | wtmpx_get_entry(struct logininfo *li) | |
1264 | { | |
1265 | struct stat st; | |
1266 | struct utmpx utx; | |
1267 | int fd, found=0; | |
1268 | ||
1269 | /* Clear the time entries */ | |
1270 | li->tv_sec = li->tv_usec = 0; | |
1271 | ||
1272 | if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) { | |
1273 | logit("wtmpx_get_entry: problem opening %s: %s", | |
1274 | WTMPX_FILE, strerror(errno)); | |
1275 | return 0; | |
1276 | } | |
1277 | if (fstat(fd, &st) != 0) { | |
1278 | logit("wtmpx_get_entry: couldn't stat %s: %s", | |
1279 | WTMPX_FILE, strerror(errno)); | |
1280 | close(fd); | |
1281 | return 0; | |
1282 | } | |
1283 | ||
1284 | /* Seek to the start of the last struct utmpx */ | |
1285 | if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) { | |
1286 | /* probably a newly rotated wtmpx file */ | |
1287 | close(fd); | |
1288 | return 0; | |
1289 | } | |
1290 | ||
1291 | while (!found) { | |
1292 | if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) { | |
1293 | logit("wtmpx_get_entry: read of %s failed: %s", | |
1294 | WTMPX_FILE, strerror(errno)); | |
1295 | close (fd); | |
1296 | return 0; | |
1297 | } | |
1298 | /* Logouts are recorded as a blank username on a particular line. | |
1299 | * So, we just need to find the username in struct utmpx */ | |
1300 | if ( wtmpx_islogin(li, &utx) ) { | |
1301 | found = 1; | |
1302 | # ifdef HAVE_TV_IN_UTMPX | |
1303 | li->tv_sec = utx.ut_tv.tv_sec; | |
1304 | # else | |
1305 | # ifdef HAVE_TIME_IN_UTMPX | |
1306 | li->tv_sec = utx.ut_time; | |
1307 | # endif | |
1308 | # endif | |
1309 | line_fullname(li->line, utx.ut_line, sizeof(li->line)); | |
1310 | # ifdef HAVE_HOST_IN_UTMPX | |
1311 | strlcpy(li->hostname, utx.ut_host, | |
1312 | MIN_SIZEOF(li->hostname, utx.ut_host)); | |
1313 | # endif | |
1314 | continue; | |
1315 | } | |
1316 | if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) { | |
1317 | close (fd); | |
1318 | return 0; | |
1319 | } | |
1320 | } | |
1321 | ||
1322 | close(fd); | |
1323 | return 1; | |
1324 | } | |
1325 | #endif /* USE_WTMPX */ | |
1326 | ||
1327 | /** | |
1328 | ** Low-level libutil login() functions | |
1329 | **/ | |
1330 | ||
1331 | #ifdef USE_LOGIN | |
1332 | static int | |
1333 | syslogin_perform_login(struct logininfo *li) | |
1334 | { | |
1335 | struct utmp *ut; | |
1336 | ||
1337 | if (! (ut = (struct utmp *)malloc(sizeof(*ut)))) { | |
1338 | logit("syslogin_perform_login: couldn't malloc()"); | |
1339 | return 0; | |
1340 | } | |
1341 | construct_utmp(li, ut); | |
1342 | login(ut); | |
1343 | free(ut); | |
1344 | ||
1345 | return 1; | |
1346 | } | |
1347 | ||
1348 | static int | |
1349 | syslogin_perform_logout(struct logininfo *li) | |
1350 | { | |
1351 | # ifdef HAVE_LOGOUT | |
1352 | char line[8]; | |
1353 | ||
1354 | (void)line_stripname(line, li->line, sizeof(line)); | |
1355 | ||
1356 | if (!logout(line)) { | |
1357 | logit("syslogin_perform_logout: logout() returned an error"); | |
1358 | # ifdef HAVE_LOGWTMP | |
1359 | } else { | |
1360 | logwtmp(line, "", ""); | |
1361 | # endif | |
1362 | } | |
1363 | /* FIXME: (ATL - if the need arises) What to do if we have | |
1364 | * login, but no logout? what if logout but no logwtmp? All | |
1365 | * routines are in libutil so they should all be there, | |
1366 | * but... */ | |
1367 | # endif | |
1368 | return 1; | |
1369 | } | |
1370 | ||
1371 | int | |
1372 | syslogin_write_entry(struct logininfo *li) | |
1373 | { | |
1374 | switch (li->type) { | |
1375 | case LTYPE_LOGIN: | |
1376 | return syslogin_perform_login(li); | |
1377 | case LTYPE_LOGOUT: | |
1378 | return syslogin_perform_logout(li); | |
1379 | default: | |
1380 | logit("syslogin_write_entry: Invalid type field"); | |
1381 | return 0; | |
1382 | } | |
1383 | } | |
1384 | #endif /* USE_LOGIN */ | |
1385 | ||
1386 | /* end of file log-syslogin.c */ | |
1387 | ||
1388 | /** | |
1389 | ** Low-level lastlog functions | |
1390 | **/ | |
1391 | ||
1392 | #ifdef USE_LASTLOG | |
1393 | #define LL_FILE 1 | |
1394 | #define LL_DIR 2 | |
1395 | #define LL_OTHER 3 | |
1396 | ||
1397 | static void | |
1398 | lastlog_construct(struct logininfo *li, struct lastlog *last) | |
1399 | { | |
1400 | /* clear the structure */ | |
1401 | memset(last, '\0', sizeof(*last)); | |
1402 | ||
1403 | (void)line_stripname(last->ll_line, li->line, sizeof(last->ll_line)); | |
1404 | strlcpy(last->ll_host, li->hostname, | |
1405 | MIN_SIZEOF(last->ll_host, li->hostname)); | |
1406 | last->ll_time = li->tv_sec; | |
1407 | } | |
1408 | ||
1409 | static int | |
1410 | lastlog_filetype(char *filename) | |
1411 | { | |
1412 | struct stat st; | |
1413 | ||
1414 | if (stat(LASTLOG_FILE, &st) != 0) { | |
1415 | logit("lastlog_perform_login: Couldn't stat %s: %s", LASTLOG_FILE, | |
1416 | strerror(errno)); | |
1417 | return 0; | |
1418 | } | |
1419 | if (S_ISDIR(st.st_mode)) | |
1420 | return LL_DIR; | |
1421 | else if (S_ISREG(st.st_mode)) | |
1422 | return LL_FILE; | |
1423 | else | |
1424 | return LL_OTHER; | |
1425 | } | |
1426 | ||
1427 | ||
1428 | /* open the file (using filemode) and seek to the login entry */ | |
1429 | static int | |
1430 | lastlog_openseek(struct logininfo *li, int *fd, int filemode) | |
1431 | { | |
1432 | off_t offset; | |
1433 | int type; | |
1434 | char lastlog_file[1024]; | |
1435 | ||
1436 | type = lastlog_filetype(LASTLOG_FILE); | |
1437 | switch (type) { | |
1438 | case LL_FILE: | |
1439 | strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file)); | |
1440 | break; | |
1441 | case LL_DIR: | |
1442 | snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s", | |
1443 | LASTLOG_FILE, li->username); | |
1444 | break; | |
1445 | default: | |
1446 | logit("lastlog_openseek: %.100s is not a file or directory!", | |
1447 | LASTLOG_FILE); | |
1448 | return 0; | |
1449 | } | |
1450 | ||
1451 | *fd = open(lastlog_file, filemode, 0600); | |
1452 | if ( *fd < 0) { | |
1453 | debug("lastlog_openseek: Couldn't open %s: %s", | |
1454 | lastlog_file, strerror(errno)); | |
1455 | return 0; | |
1456 | } | |
1457 | ||
1458 | if (type == LL_FILE) { | |
1459 | /* find this uid's offset in the lastlog file */ | |
1460 | offset = (off_t) ((long)li->uid * sizeof(struct lastlog)); | |
1461 | ||
1462 | if ( lseek(*fd, offset, SEEK_SET) != offset ) { | |
1463 | logit("lastlog_openseek: %s->lseek(): %s", | |
1464 | lastlog_file, strerror(errno)); | |
1465 | return 0; | |
1466 | } | |
1467 | } | |
1468 | ||
1469 | return 1; | |
1470 | } | |
1471 | ||
1472 | static int | |
1473 | lastlog_perform_login(struct logininfo *li) | |
1474 | { | |
1475 | struct lastlog last; | |
1476 | int fd; | |
1477 | ||
1478 | /* create our struct lastlog */ | |
1479 | lastlog_construct(li, &last); | |
1480 | ||
1481 | if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT)) | |
1482 | return(0); | |
1483 | ||
1484 | /* write the entry */ | |
1485 | if (atomicio(vwrite, fd, &last, sizeof(last)) != sizeof(last)) { | |
1486 | close(fd); | |
1487 | logit("lastlog_write_filemode: Error writing to %s: %s", | |
1488 | LASTLOG_FILE, strerror(errno)); | |
1489 | return 0; | |
1490 | } | |
1491 | ||
1492 | close(fd); | |
1493 | return 1; | |
1494 | } | |
1495 | ||
1496 | int | |
1497 | lastlog_write_entry(struct logininfo *li) | |
1498 | { | |
1499 | switch(li->type) { | |
1500 | case LTYPE_LOGIN: | |
1501 | return lastlog_perform_login(li); | |
1502 | default: | |
1503 | logit("lastlog_write_entry: Invalid type field"); | |
1504 | return 0; | |
1505 | } | |
1506 | } | |
1507 | ||
1508 | static void | |
1509 | lastlog_populate_entry(struct logininfo *li, struct lastlog *last) | |
1510 | { | |
1511 | line_fullname(li->line, last->ll_line, sizeof(li->line)); | |
1512 | strlcpy(li->hostname, last->ll_host, | |
1513 | MIN_SIZEOF(li->hostname, last->ll_host)); | |
1514 | li->tv_sec = last->ll_time; | |
1515 | } | |
1516 | ||
1517 | int | |
1518 | lastlog_get_entry(struct logininfo *li) | |
1519 | { | |
1520 | struct lastlog last; | |
1521 | int fd, ret; | |
1522 | ||
1523 | if (!lastlog_openseek(li, &fd, O_RDONLY)) | |
1524 | return (0); | |
1525 | ||
1526 | ret = atomicio(read, fd, &last, sizeof(last)); | |
1527 | close(fd); | |
1528 | ||
1529 | switch (ret) { | |
1530 | case 0: | |
1531 | memset(&last, '\0', sizeof(last)); | |
1532 | /* FALLTHRU */ | |
1533 | case sizeof(last): | |
1534 | lastlog_populate_entry(li, &last); | |
1535 | return (1); | |
1536 | case -1: | |
1537 | error("%s: Error reading from %s: %s", __func__, | |
1538 | LASTLOG_FILE, strerror(errno)); | |
1539 | return (0); | |
1540 | default: | |
1541 | error("%s: Error reading from %s: Expecting %d, got %d", | |
1542 | __func__, LASTLOG_FILE, sizeof(last), ret); | |
1543 | return (0); | |
1544 | } | |
1545 | ||
1546 | /* NOTREACHED */ | |
1547 | return (0); | |
1548 | } | |
1549 | #endif /* USE_LASTLOG */ |