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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 | * 3. All advertising materials mentioning features or use of this software | |
16 | * must display the following acknowledgement: | |
17 | * This product includes software developed by Markus Friedl. | |
18 | * 4. The name of the author may not be used to endorse or promote products | |
19 | * derived from this software without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
22 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
23 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
24 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
25 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
26 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
27 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
28 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
29 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
30 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
31 | */ | |
32 | ||
33 | /** | |
34 | ** loginrec.c: platform-independent login recording and lastlog retrieval | |
35 | **/ | |
36 | ||
37 | /* | |
38 | The new login code explained | |
39 | ============================ | |
40 | ||
41 | This code attempts to provide a common interface to login recording | |
42 | (utmp and friends) and last login time retrieval. | |
43 | ||
44 | Its primary means of achieving this is to use 'struct logininfo', a | |
45 | union of all the useful fields in the various different types of | |
46 | system login record structures one finds on UNIX variants. | |
47 | ||
48 | We depend on autoconf to define which recording methods are to be | |
49 | used, and which fields are contained in the relevant data structures | |
50 | on the local system. Many C preprocessor symbols affect which code | |
51 | gets compiled here. | |
52 | ||
53 | The code is designed to make it easy to modify a particular | |
54 | recording method, without affecting other methods nor requiring so | |
55 | many nested conditional compilation blocks as were commonplace in | |
56 | the old code. | |
57 | ||
58 | For login recording, we try to use the local system's libraries as | |
59 | these are clearly most likely to work correctly. For utmp systems | |
60 | this usually means login() and logout() or setutent() etc., probably | |
61 | in libutil, along with logwtmp() etc. On these systems, we fall back | |
62 | to writing the files directly if we have to, though this method | |
63 | requires very thorough testing so we do not corrupt local auditing | |
64 | information. These files and their access methods are very system | |
65 | specific indeed. | |
66 | ||
67 | For utmpx systems, the corresponding library functions are | |
68 | setutxent() etc. To the author's knowledge, all utmpx systems have | |
69 | these library functions and so no direct write is attempted. If such | |
70 | a system exists and needs support, direct analogues of the [uw]tmp | |
71 | code should suffice. | |
72 | ||
73 | Retrieving the time of last login ('lastlog') is in some ways even | |
74 | more problemmatic than login recording. Some systems provide a | |
75 | simple table of all users which we seek based on uid and retrieve a | |
76 | relatively standard structure. Others record the same information in | |
77 | a directory with a separate file, and others don't record the | |
78 | information separately at all. For systems in the latter category, | |
79 | we look backwards in the wtmp or wtmpx file for the last login entry | |
80 | for our user. Naturally this is slower and on busy systems could | |
81 | incur a significant performance penalty. | |
82 | ||
83 | Calling the new code | |
84 | -------------------- | |
85 | ||
86 | In OpenSSH all login recording and retrieval is performed in | |
87 | login.c. Here you'll find working examples. Also, in the logintest.c | |
88 | program there are more examples. | |
89 | ||
90 | Internal handler calling method | |
91 | ------------------------------- | |
92 | ||
93 | When a call is made to login_login() or login_logout(), both | |
94 | routines set a struct logininfo flag defining which action (log in, | |
95 | or log out) is to be taken. They both then call login_write(), which | |
96 | calls whichever of the many structure-specific handlers autoconf | |
97 | selects for the local system. | |
98 | ||
99 | The handlers themselves handle system data structure specifics. Both | |
100 | struct utmp and struct utmpx have utility functions (see | |
101 | construct_utmp*()) to try to make it simpler to add extra systems | |
102 | that introduce new features to either structure. | |
103 | ||
104 | While it may seem terribly wasteful to replicate so much similar | |
105 | code for each method, experience has shown that maintaining code to | |
106 | write both struct utmp and utmpx in one function, whilst maintaining | |
107 | support for all systems whether they have library support or not, is | |
108 | a difficult and time-consuming task. | |
109 | ||
110 | Lastlog support proceeds similarly. Functions login_get_lastlog() | |
111 | (and its OpenSSH-tuned friend login_get_lastlog_time()) call | |
112 | getlast_entry(), which tries one of three methods to find the last | |
113 | login time. It uses local system lastlog support if it can, | |
114 | otherwise it tries wtmp or wtmpx before giving up and returning 0, | |
115 | meaning "tilt". | |
116 | ||
117 | Maintenance | |
118 | ----------- | |
119 | ||
120 | In many cases it's possible to tweak autoconf to select the correct | |
121 | methods for a particular platform, either by improving the detection | |
122 | code (best), or by presetting DISABLE_<method> or CONF_<method>_FILE | |
123 | symbols for the platform. | |
124 | ||
125 | Use logintest to check which symbols are defined before modifying | |
126 | configure.in and loginrec.c. (You have to build logintest yourself | |
127 | with 'make logintest' as it's not built by default.) | |
128 | ||
129 | Otherwise, patches to the specific method(s) are very helpful! | |
130 | ||
131 | */ | |
132 | ||
133 | /** | |
134 | ** TODO: | |
135 | ** homegrown ttyslot() | |
136 | ** test, test, test | |
137 | ** | |
138 | ** Platform status: | |
139 | ** ---------------- | |
140 | ** | |
141 | ** Known good: | |
142 | ** Linux (Redhat 6.2, Debian) | |
143 | ** Solaris | |
144 | ** HP-UX 10.20 (gcc only) | |
145 | ** IRIX | |
146 | ** NeXT - M68k/HPPA/Sparc (4.2/3.3) | |
147 | ** | |
148 | ** Testing required: Please send reports! | |
149 | ** NetBSD | |
150 | ** HP-UX 11 | |
151 | ** AIX | |
152 | ** | |
153 | ** Platforms with known problems: | |
154 | ** Some variants of Slackware Linux | |
155 | ** | |
156 | **/ | |
157 | ||
158 | #include "includes.h" | |
159 | ||
160 | #include "ssh.h" | |
161 | #include "xmalloc.h" | |
162 | #include "loginrec.h" | |
163 | #include "log.h" | |
164 | #include "atomicio.h" | |
165 | ||
166 | RCSID("$Id$"); | |
167 | ||
168 | #ifdef HAVE_UTIL_H | |
169 | # include <util.h> | |
170 | #endif | |
171 | ||
172 | #ifdef HAVE_LIBUTIL_H | |
173 | # include <libutil.h> | |
174 | #endif | |
175 | ||
176 | /** | |
177 | ** prototypes for helper functions in this file | |
178 | **/ | |
179 | ||
180 | #if HAVE_UTMP_H | |
181 | void set_utmp_time(struct logininfo *li, struct utmp *ut); | |
182 | void construct_utmp(struct logininfo *li, struct utmp *ut); | |
183 | #endif | |
184 | ||
185 | #ifdef HAVE_UTMPX_H | |
186 | void set_utmpx_time(struct logininfo *li, struct utmpx *ut); | |
187 | void construct_utmpx(struct logininfo *li, struct utmpx *ut); | |
188 | #endif | |
189 | ||
190 | int utmp_write_entry(struct logininfo *li); | |
191 | int utmpx_write_entry(struct logininfo *li); | |
192 | int wtmp_write_entry(struct logininfo *li); | |
193 | int wtmpx_write_entry(struct logininfo *li); | |
194 | int lastlog_write_entry(struct logininfo *li); | |
195 | int syslogin_write_entry(struct logininfo *li); | |
196 | ||
197 | int getlast_entry(struct logininfo *li); | |
198 | int lastlog_get_entry(struct logininfo *li); | |
199 | int wtmp_get_entry(struct logininfo *li); | |
200 | int wtmpx_get_entry(struct logininfo *li); | |
201 | ||
202 | /* pick the shortest string */ | |
203 | #define MIN_SIZEOF(s1,s2) ( sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2) ) | |
204 | ||
205 | /** | |
206 | ** platform-independent login functions | |
207 | **/ | |
208 | ||
209 | /* login_login(struct logininfo *) -Record a login | |
210 | * | |
211 | * Call with a pointer to a struct logininfo initialised with | |
212 | * login_init_entry() or login_alloc_entry() | |
213 | * | |
214 | * Returns: | |
215 | * >0 if successful | |
216 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
217 | */ | |
218 | int | |
219 | login_login (struct logininfo *li) | |
220 | { | |
221 | li->type = LTYPE_LOGIN; | |
222 | return login_write(li); | |
223 | } | |
224 | ||
225 | ||
226 | /* login_logout(struct logininfo *) - Record a logout | |
227 | * | |
228 | * Call as with login_login() | |
229 | * | |
230 | * Returns: | |
231 | * >0 if successful | |
232 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
233 | */ | |
234 | int | |
235 | login_logout(struct logininfo *li) | |
236 | { | |
237 | li->type = LTYPE_LOGOUT; | |
238 | return login_write(li); | |
239 | } | |
240 | ||
241 | /* login_get_lastlog_time(int) - Retrieve the last login time | |
242 | * | |
243 | * Retrieve the last login time for the given uid. Will try to use the | |
244 | * system lastlog facilities if they are available, but will fall back | |
245 | * to looking in wtmp/wtmpx if necessary | |
246 | * | |
247 | * Returns: | |
248 | * 0 on failure, or if user has never logged in | |
249 | * Time in seconds from the epoch if successful | |
250 | * | |
251 | * Useful preprocessor symbols: | |
252 | * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog | |
253 | * info | |
254 | * USE_LASTLOG: If set, indicates the presence of system lastlog | |
255 | * facilities. If this and DISABLE_LASTLOG are not set, | |
256 | * try to retrieve lastlog information from wtmp/wtmpx. | |
257 | */ | |
258 | unsigned int | |
259 | login_get_lastlog_time(const int uid) | |
260 | { | |
261 | struct logininfo li; | |
262 | ||
263 | if (login_get_lastlog(&li, uid)) | |
264 | return li.tv_sec; | |
265 | else | |
266 | return 0; | |
267 | } | |
268 | ||
269 | /* login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry | |
270 | * | |
271 | * Retrieve a logininfo structure populated (only partially) with | |
272 | * information from the system lastlog data, or from wtmp/wtmpx if no | |
273 | * system lastlog information exists. | |
274 | * | |
275 | * Note this routine must be given a pre-allocated logininfo. | |
276 | * | |
277 | * Returns: | |
278 | * >0: A pointer to your struct logininfo if successful | |
279 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
280 | * | |
281 | */ | |
282 | struct logininfo * | |
283 | login_get_lastlog(struct logininfo *li, const int uid) | |
284 | { | |
285 | struct passwd *pw; | |
286 | ||
287 | memset(li, '\0', sizeof(*li)); | |
288 | li->uid = uid; | |
289 | ||
290 | /* | |
291 | * If we don't have a 'real' lastlog, we need the username to | |
292 | * reliably search wtmp(x) for the last login (see | |
293 | * wtmp_get_entry().) | |
294 | */ | |
295 | pw = getpwuid(uid); | |
296 | if (pw == NULL) | |
297 | fatal("login_get_lastlog: Cannot find account for uid %i", uid); | |
298 | ||
299 | /* No MIN_SIZEOF here - we absolutely *must not* truncate the | |
300 | * username */ | |
301 | strlcpy(li->username, pw->pw_name, sizeof(li->username)); | |
302 | ||
303 | if (getlast_entry(li)) | |
304 | return li; | |
305 | else | |
306 | return NULL; | |
307 | } | |
308 | ||
309 | ||
310 | /* login_alloc_entry(int, char*, char*, char*) - Allocate and initialise | |
311 | * a logininfo structure | |
312 | * | |
313 | * This function creates a new struct logininfo, a data structure | |
314 | * meant to carry the information required to portably record login info. | |
315 | * | |
316 | * Returns a pointer to a newly created struct logininfo. If memory | |
317 | * allocation fails, the program halts. | |
318 | */ | |
319 | struct | |
320 | logininfo *login_alloc_entry(int pid, const char *username, | |
321 | const char *hostname, const char *line) | |
322 | { | |
323 | struct logininfo *newli; | |
324 | ||
325 | newli = (struct logininfo *) xmalloc (sizeof(*newli)); | |
326 | (void)login_init_entry(newli, pid, username, hostname, line); | |
327 | return newli; | |
328 | } | |
329 | ||
330 | ||
331 | /* login_free_entry(struct logininfo *) - free struct memory */ | |
332 | void | |
333 | login_free_entry(struct logininfo *li) | |
334 | { | |
335 | xfree(li); | |
336 | } | |
337 | ||
338 | ||
339 | /* login_init_entry(struct logininfo *, int, char*, char*, char*) | |
340 | * - initialise a struct logininfo | |
341 | * | |
342 | * Populates a new struct logininfo, a data structure meant to carry | |
343 | * the information required to portably record login info. | |
344 | * | |
345 | * Returns: 1 | |
346 | */ | |
347 | int | |
348 | login_init_entry(struct logininfo *li, int pid, const char *username, | |
349 | const char *hostname, const char *line) | |
350 | { | |
351 | struct passwd *pw; | |
352 | ||
353 | memset(li, 0, sizeof(*li)); | |
354 | ||
355 | li->pid = pid; | |
356 | ||
357 | /* set the line information */ | |
358 | if (line) | |
359 | line_fullname(li->line, line, sizeof(li->line)); | |
360 | ||
361 | if (username) { | |
362 | strlcpy(li->username, username, sizeof(li->username)); | |
363 | pw = getpwnam(li->username); | |
364 | if (pw == NULL) | |
365 | fatal("login_init_entry: Cannot find user \"%s\"", li->username); | |
366 | li->uid = pw->pw_uid; | |
367 | } | |
368 | ||
369 | if (hostname) | |
370 | strlcpy(li->hostname, hostname, sizeof(li->hostname)); | |
371 | ||
372 | return 1; | |
373 | } | |
374 | ||
375 | /* login_set_current_time(struct logininfo *) - set the current time | |
376 | * | |
377 | * Set the current time in a logininfo structure. This function is | |
378 | * meant to eliminate the need to deal with system dependencies for | |
379 | * time handling. | |
380 | */ | |
381 | void | |
382 | login_set_current_time(struct logininfo *li) | |
383 | { | |
384 | struct timeval tv; | |
385 | ||
386 | gettimeofday(&tv, NULL); | |
387 | ||
388 | li->tv_sec = tv.tv_sec; | |
389 | li->tv_usec = tv.tv_usec; | |
390 | } | |
391 | ||
392 | /* copy a sockaddr_* into our logininfo */ | |
393 | void | |
394 | login_set_addr(struct logininfo *li, const struct sockaddr *sa, | |
395 | const unsigned int sa_size) | |
396 | { | |
397 | unsigned int bufsize = sa_size; | |
398 | ||
399 | /* make sure we don't overrun our union */ | |
400 | if (sizeof(li->hostaddr) < sa_size) | |
401 | bufsize = sizeof(li->hostaddr); | |
402 | ||
403 | memcpy((void *)&(li->hostaddr.sa), (const void *)sa, bufsize); | |
404 | } | |
405 | ||
406 | ||
407 | /** | |
408 | ** login_write: Call low-level recording functions based on autoconf | |
409 | ** results | |
410 | **/ | |
411 | int | |
412 | login_write (struct logininfo *li) | |
413 | { | |
414 | #ifndef HAVE_CYGWIN | |
415 | if ((int)geteuid() != 0) { | |
416 | log("Attempt to write login records by non-root user (aborting)"); | |
417 | return 1; | |
418 | } | |
419 | #endif | |
420 | ||
421 | /* set the timestamp */ | |
422 | login_set_current_time(li); | |
423 | #ifdef USE_LOGIN | |
424 | syslogin_write_entry(li); | |
425 | #endif | |
426 | #ifdef USE_LASTLOG | |
427 | if (li->type == LTYPE_LOGIN) { | |
428 | lastlog_write_entry(li); | |
429 | } | |
430 | #endif | |
431 | #ifdef USE_UTMP | |
432 | utmp_write_entry(li); | |
433 | #endif | |
434 | #ifdef USE_WTMP | |
435 | wtmp_write_entry(li); | |
436 | #endif | |
437 | #ifdef USE_UTMPX | |
438 | utmpx_write_entry(li); | |
439 | #endif | |
440 | #ifdef USE_WTMPX | |
441 | wtmpx_write_entry(li); | |
442 | #endif | |
443 | return 0; | |
444 | } | |
445 | ||
446 | /** | |
447 | ** getlast_entry: Call low-level functions to retrieve the last login | |
448 | ** time. | |
449 | **/ | |
450 | ||
451 | /* take the uid in li and return the last login time */ | |
452 | int | |
453 | getlast_entry(struct logininfo *li) | |
454 | { | |
455 | #ifdef USE_LASTLOG | |
456 | return(lastlog_get_entry(li)); | |
457 | #else /* !USE_LASTLOG */ | |
458 | ||
459 | #ifdef DISABLE_LASTLOG | |
460 | /* On some systems we shouldn't even try to obtain last login | |
461 | * time, e.g. AIX */ | |
462 | return 0; | |
463 | # else /* DISABLE_LASTLOG */ | |
464 | /* Try to retrieve the last login time from wtmp */ | |
465 | # if defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) | |
466 | /* retrieve last login time from utmp */ | |
467 | return (wtmp_get_entry(li)); | |
468 | # else /* defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) */ | |
469 | /* If wtmp isn't available, try wtmpx */ | |
470 | # if defined(USE_WTMPX) && (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX)) | |
471 | /* retrieve last login time from utmpx */ | |
472 | return (wtmpx_get_entry(li)); | |
473 | # else | |
474 | /* Give up: No means of retrieving last login time */ | |
475 | return 0; | |
476 | # endif /* USE_WTMPX && (HAVE_TIME_IN_UTMPX || HAVE_TV_IN_UTMPX) */ | |
477 | # endif /* USE_WTMP && (HAVE_TIME_IN_UTMP || HAVE_TV_IN_UTMP) */ | |
478 | # endif /* DISABLE_LASTLOG */ | |
479 | #endif /* USE_LASTLOG */ | |
480 | } | |
481 | ||
482 | ||
483 | ||
484 | /* | |
485 | * 'line' string utility functions | |
486 | * | |
487 | * These functions process the 'line' string into one of three forms: | |
488 | * | |
489 | * 1. The full filename (including '/dev') | |
490 | * 2. The stripped name (excluding '/dev') | |
491 | * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00 | |
492 | * /dev/pts/1 -> ts/1 ) | |
493 | * | |
494 | * Form 3 is used on some systems to identify a .tmp.? entry when | |
495 | * attempting to remove it. Typically both addition and removal is | |
496 | * performed by one application - say, sshd - so as long as the choice | |
497 | * uniquely identifies a terminal it's ok. | |
498 | */ | |
499 | ||
500 | ||
501 | /* line_fullname(): add the leading '/dev/' if it doesn't exist make | |
502 | * sure dst has enough space, if not just copy src (ugh) */ | |
503 | char * | |
504 | line_fullname(char *dst, const char *src, int dstsize) | |
505 | { | |
506 | memset(dst, '\0', dstsize); | |
507 | if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) { | |
508 | strlcpy(dst, src, dstsize); | |
509 | } else { | |
510 | strlcpy(dst, "/dev/", dstsize); | |
511 | strlcat(dst, src, dstsize); | |
512 | } | |
513 | return dst; | |
514 | } | |
515 | ||
516 | /* line_stripname(): strip the leading '/dev' if it exists, return dst */ | |
517 | char * | |
518 | line_stripname(char *dst, const char *src, int dstsize) | |
519 | { | |
520 | memset(dst, '\0', dstsize); | |
521 | if (strncmp(src, "/dev/", 5) == 0) | |
522 | strlcpy(dst, src + 5, dstsize); | |
523 | else | |
524 | strlcpy(dst, src, dstsize); | |
525 | return dst; | |
526 | } | |
527 | ||
528 | /* line_abbrevname(): Return the abbreviated (usually four-character) | |
529 | * form of the line (Just use the last <dstsize> characters of the | |
530 | * full name.) | |
531 | * | |
532 | * NOTE: use strncpy because we do NOT necessarily want zero | |
533 | * termination */ | |
534 | char * | |
535 | line_abbrevname(char *dst, const char *src, int dstsize) | |
536 | { | |
537 | size_t len; | |
538 | ||
539 | memset(dst, '\0', dstsize); | |
540 | ||
541 | /* Always skip prefix if present */ | |
542 | #ifdef sgi | |
543 | if (strncmp(src, "/dev/tty", 8) == 0) | |
544 | src += 8; | |
545 | #else | |
546 | if (strncmp(src, "/dev/", 5) == 0) | |
547 | src += 5; | |
548 | #endif | |
549 | ||
550 | len = strlen(src); | |
551 | ||
552 | if (len > 0) { | |
553 | if (((int)len - dstsize) > 0) | |
554 | src += ((int)len - dstsize); | |
555 | ||
556 | /* note: _don't_ change this to strlcpy */ | |
557 | strncpy(dst, src, (size_t)dstsize); | |
558 | } | |
559 | ||
560 | return dst; | |
561 | } | |
562 | ||
563 | /** | |
564 | ** utmp utility functions | |
565 | ** | |
566 | ** These functions manipulate struct utmp, taking system differences | |
567 | ** into account. | |
568 | **/ | |
569 | ||
570 | #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN) | |
571 | ||
572 | /* build the utmp structure */ | |
573 | void | |
574 | set_utmp_time(struct logininfo *li, struct utmp *ut) | |
575 | { | |
576 | # ifdef HAVE_TV_IN_UTMP | |
577 | ut->ut_tv.tv_sec = li->tv_sec; | |
578 | ut->ut_tv.tv_usec = li->tv_usec; | |
579 | # else | |
580 | # ifdef HAVE_TIME_IN_UTMP | |
581 | ut->ut_time = li->tv_sec; | |
582 | # endif | |
583 | # endif | |
584 | } | |
585 | ||
586 | void | |
587 | construct_utmp(struct logininfo *li, | |
588 | struct utmp *ut) | |
589 | { | |
590 | memset(ut, '\0', sizeof(*ut)); | |
591 | ||
592 | /* First fill out fields used for both logins and logouts */ | |
593 | ||
594 | # ifdef HAVE_ID_IN_UTMP | |
595 | line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id)); | |
596 | # endif | |
597 | ||
598 | # ifdef HAVE_TYPE_IN_UTMP | |
599 | /* This is done here to keep utmp constants out of struct logininfo */ | |
600 | switch (li->type) { | |
601 | case LTYPE_LOGIN: | |
602 | ut->ut_type = USER_PROCESS; | |
603 | break; | |
604 | case LTYPE_LOGOUT: | |
605 | ut->ut_type = DEAD_PROCESS; | |
606 | break; | |
607 | } | |
608 | # endif | |
609 | set_utmp_time(li, ut); | |
610 | ||
611 | line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line)); | |
612 | ||
613 | # ifdef HAVE_PID_IN_UTMP | |
614 | ut->ut_pid = li->pid; | |
615 | # endif | |
616 | ||
617 | /* If we're logging out, leave all other fields blank */ | |
618 | if (li->type == LTYPE_LOGOUT) | |
619 | return; | |
620 | ||
621 | /* | |
622 | * These fields are only used when logging in, and are blank | |
623 | * for logouts. | |
624 | */ | |
625 | ||
626 | /* Use strncpy because we don't necessarily want null termination */ | |
627 | strncpy(ut->ut_name, li->username, MIN_SIZEOF(ut->ut_name, li->username)); | |
628 | # ifdef HAVE_HOST_IN_UTMP | |
629 | strncpy(ut->ut_host, li->hostname, MIN_SIZEOF(ut->ut_host, li->hostname)); | |
630 | # endif | |
631 | # ifdef HAVE_ADDR_IN_UTMP | |
632 | /* this is just a 32-bit IP address */ | |
633 | if (li->hostaddr.sa.sa_family == AF_INET) | |
634 | ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
635 | # endif | |
636 | } | |
637 | #endif /* USE_UTMP || USE_WTMP || USE_LOGIN */ | |
638 | ||
639 | /** | |
640 | ** utmpx utility functions | |
641 | ** | |
642 | ** These functions manipulate struct utmpx, accounting for system | |
643 | ** variations. | |
644 | **/ | |
645 | ||
646 | #if defined(USE_UTMPX) || defined (USE_WTMPX) | |
647 | /* build the utmpx structure */ | |
648 | void | |
649 | set_utmpx_time(struct logininfo *li, struct utmpx *utx) | |
650 | { | |
651 | # ifdef HAVE_TV_IN_UTMPX | |
652 | utx->ut_tv.tv_sec = li->tv_sec; | |
653 | utx->ut_tv.tv_usec = li->tv_usec; | |
654 | # else /* HAVE_TV_IN_UTMPX */ | |
655 | # ifdef HAVE_TIME_IN_UTMPX | |
656 | utx->ut_time = li->tv_sec; | |
657 | # endif /* HAVE_TIME_IN_UTMPX */ | |
658 | # endif /* HAVE_TV_IN_UTMPX */ | |
659 | } | |
660 | ||
661 | void | |
662 | construct_utmpx(struct logininfo *li, struct utmpx *utx) | |
663 | { | |
664 | memset(utx, '\0', sizeof(*utx)); | |
665 | # ifdef HAVE_ID_IN_UTMPX | |
666 | line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id)); | |
667 | # endif | |
668 | ||
669 | /* this is done here to keep utmp constants out of loginrec.h */ | |
670 | switch (li->type) { | |
671 | case LTYPE_LOGIN: | |
672 | utx->ut_type = USER_PROCESS; | |
673 | break; | |
674 | case LTYPE_LOGOUT: | |
675 | utx->ut_type = DEAD_PROCESS; | |
676 | break; | |
677 | } | |
678 | line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line)); | |
679 | set_utmpx_time(li, utx); | |
680 | utx->ut_pid = li->pid; | |
681 | ||
682 | if (li->type == LTYPE_LOGOUT) | |
683 | return; | |
684 | ||
685 | /* | |
686 | * These fields are only used when logging in, and are blank | |
687 | * for logouts. | |
688 | */ | |
689 | ||
690 | /* strncpy(): Don't necessarily want null termination */ | |
691 | strncpy(utx->ut_name, li->username, MIN_SIZEOF(utx->ut_name, li->username)); | |
692 | # ifdef HAVE_HOST_IN_UTMPX | |
693 | strncpy(utx->ut_host, li->hostname, MIN_SIZEOF(utx->ut_host, li->hostname)); | |
694 | # endif | |
695 | # ifdef HAVE_ADDR_IN_UTMPX | |
696 | /* this is just a 32-bit IP address */ | |
697 | if (li->hostaddr.sa.sa_family == AF_INET) | |
698 | utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
699 | # endif | |
700 | # ifdef HAVE_SYSLEN_IN_UTMPX | |
701 | /* ut_syslen is the length of the utx_host string */ | |
702 | utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host)); | |
703 | # endif | |
704 | } | |
705 | #endif /* USE_UTMPX || USE_WTMPX */ | |
706 | ||
707 | /** | |
708 | ** Low-level utmp functions | |
709 | **/ | |
710 | ||
711 | /* FIXME: (ATL) utmp_write_direct needs testing */ | |
712 | #ifdef USE_UTMP | |
713 | ||
714 | /* if we can, use pututline() etc. */ | |
715 | # if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \ | |
716 | defined(HAVE_PUTUTLINE) | |
717 | # define UTMP_USE_LIBRARY | |
718 | # endif | |
719 | ||
720 | ||
721 | /* write a utmp entry with the system's help (pututline() and pals) */ | |
722 | # ifdef UTMP_USE_LIBRARY | |
723 | static int | |
724 | utmp_write_library(struct logininfo *li, struct utmp *ut) | |
725 | { | |
726 | setutent(); | |
727 | pututline(ut); | |
728 | ||
729 | # ifdef HAVE_ENDUTENT | |
730 | endutent(); | |
731 | # endif | |
732 | return 1; | |
733 | } | |
734 | # else /* UTMP_USE_LIBRARY */ | |
735 | ||
736 | /* write a utmp entry direct to the file */ | |
737 | /* This is a slightly modification of code in OpenBSD's login.c */ | |
738 | static int | |
739 | utmp_write_direct(struct logininfo *li, struct utmp *ut) | |
740 | { | |
741 | struct utmp old_ut; | |
742 | register int fd; | |
743 | int tty; | |
744 | ||
745 | /* FIXME: (ATL) ttyslot() needs local implementation */ | |
746 | ||
747 | #if defined(HAVE_GETTTYENT) | |
748 | register struct ttyent *ty; | |
749 | ||
750 | tty=0; | |
751 | ||
752 | setttyent(); | |
753 | while ((struct ttyent *)0 != (ty = getttyent())) { | |
754 | tty++; | |
755 | if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line))) | |
756 | break; | |
757 | } | |
758 | endttyent(); | |
759 | ||
760 | if((struct ttyent *)0 == ty) { | |
761 | log("utmp_write_entry: tty not found"); | |
762 | return(1); | |
763 | } | |
764 | #else /* FIXME */ | |
765 | ||
766 | tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */ | |
767 | ||
768 | #endif /* HAVE_GETTTYENT */ | |
769 | ||
770 | if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) { | |
771 | (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET); | |
772 | /* | |
773 | * Prevent luser from zero'ing out ut_host. | |
774 | * If the new ut_line is empty but the old one is not | |
775 | * and ut_line and ut_name match, preserve the old ut_line. | |
776 | */ | |
777 | if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) && | |
778 | (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') && | |
779 | (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) && | |
780 | (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) { | |
781 | (void)memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host)); | |
782 | } | |
783 | ||
784 | (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET); | |
785 | if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut)) | |
786 | log("utmp_write_direct: error writing %s: %s", | |
787 | UTMP_FILE, strerror(errno)); | |
788 | ||
789 | (void)close(fd); | |
790 | return 1; | |
791 | } else { | |
792 | return 0; | |
793 | } | |
794 | } | |
795 | # endif /* UTMP_USE_LIBRARY */ | |
796 | ||
797 | static int | |
798 | utmp_perform_login(struct logininfo *li) | |
799 | { | |
800 | struct utmp ut; | |
801 | ||
802 | construct_utmp(li, &ut); | |
803 | # ifdef UTMP_USE_LIBRARY | |
804 | if (!utmp_write_library(li, &ut)) { | |
805 | log("utmp_perform_login: utmp_write_library() failed"); | |
806 | return 0; | |
807 | } | |
808 | # else | |
809 | if (!utmp_write_direct(li, &ut)) { | |
810 | log("utmp_perform_login: utmp_write_direct() failed"); | |
811 | return 0; | |
812 | } | |
813 | # endif | |
814 | return 1; | |
815 | } | |
816 | ||
817 | ||
818 | static int | |
819 | utmp_perform_logout(struct logininfo *li) | |
820 | { | |
821 | struct utmp ut; | |
822 | ||
823 | construct_utmp(li, &ut); | |
824 | # ifdef UTMP_USE_LIBRARY | |
825 | if (!utmp_write_library(li, &ut)) { | |
826 | log("utmp_perform_logout: utmp_write_library() failed"); | |
827 | return 0; | |
828 | } | |
829 | # else | |
830 | if (!utmp_write_direct(li, &ut)) { | |
831 | log("utmp_perform_logout: utmp_write_direct() failed"); | |
832 | return 0; | |
833 | } | |
834 | # endif | |
835 | return 1; | |
836 | } | |
837 | ||
838 | ||
839 | int | |
840 | utmp_write_entry(struct logininfo *li) | |
841 | { | |
842 | switch(li->type) { | |
843 | case LTYPE_LOGIN: | |
844 | return utmp_perform_login(li); | |
845 | ||
846 | case LTYPE_LOGOUT: | |
847 | return utmp_perform_logout(li); | |
848 | ||
849 | default: | |
850 | log("utmp_write_entry: invalid type field"); | |
851 | return 0; | |
852 | } | |
853 | } | |
854 | #endif /* USE_UTMP */ | |
855 | ||
856 | ||
857 | /** | |
858 | ** Low-level utmpx functions | |
859 | **/ | |
860 | ||
861 | /* not much point if we don't want utmpx entries */ | |
862 | #ifdef USE_UTMPX | |
863 | ||
864 | /* if we have the wherewithall, use pututxline etc. */ | |
865 | # if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \ | |
866 | defined(HAVE_PUTUTXLINE) | |
867 | # define UTMPX_USE_LIBRARY | |
868 | # endif | |
869 | ||
870 | ||
871 | /* write a utmpx entry with the system's help (pututxline() and pals) */ | |
872 | # ifdef UTMPX_USE_LIBRARY | |
873 | static int | |
874 | utmpx_write_library(struct logininfo *li, struct utmpx *utx) | |
875 | { | |
876 | setutxent(); | |
877 | pututxline(utx); | |
878 | ||
879 | # ifdef HAVE_ENDUTXENT | |
880 | endutxent(); | |
881 | # endif | |
882 | return 1; | |
883 | } | |
884 | ||
885 | # else /* UTMPX_USE_LIBRARY */ | |
886 | ||
887 | /* write a utmp entry direct to the file */ | |
888 | static int | |
889 | utmpx_write_direct(struct logininfo *li, struct utmpx *utx) | |
890 | { | |
891 | log("utmpx_write_direct: not implemented!"); | |
892 | return 0; | |
893 | } | |
894 | # endif /* UTMPX_USE_LIBRARY */ | |
895 | ||
896 | static int | |
897 | utmpx_perform_login(struct logininfo *li) | |
898 | { | |
899 | struct utmpx utx; | |
900 | ||
901 | construct_utmpx(li, &utx); | |
902 | # ifdef UTMPX_USE_LIBRARY | |
903 | if (!utmpx_write_library(li, &utx)) { | |
904 | log("utmpx_perform_login: utmp_write_library() failed"); | |
905 | return 0; | |
906 | } | |
907 | # else | |
908 | if (!utmpx_write_direct(li, &ut)) { | |
909 | log("utmpx_perform_login: utmp_write_direct() failed"); | |
910 | return 0; | |
911 | } | |
912 | # endif | |
913 | return 1; | |
914 | } | |
915 | ||
916 | ||
917 | static int | |
918 | utmpx_perform_logout(struct logininfo *li) | |
919 | { | |
920 | struct utmpx utx; | |
921 | ||
922 | memset(&utx, '\0', sizeof(utx)); | |
923 | set_utmpx_time(li, &utx); | |
924 | line_stripname(utx.ut_line, li->line, sizeof(utx.ut_line)); | |
925 | # ifdef HAVE_ID_IN_UTMPX | |
926 | line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id)); | |
927 | # endif | |
928 | # ifdef HAVE_TYPE_IN_UTMPX | |
929 | utx.ut_type = DEAD_PROCESS; | |
930 | # endif | |
931 | ||
932 | # ifdef UTMPX_USE_LIBRARY | |
933 | utmpx_write_library(li, &utx); | |
934 | # else | |
935 | utmpx_write_direct(li, &utx); | |
936 | # endif | |
937 | return 1; | |
938 | } | |
939 | ||
940 | int | |
941 | utmpx_write_entry(struct logininfo *li) | |
942 | { | |
943 | switch(li->type) { | |
944 | case LTYPE_LOGIN: | |
945 | return utmpx_perform_login(li); | |
946 | case LTYPE_LOGOUT: | |
947 | return utmpx_perform_logout(li); | |
948 | default: | |
949 | log("utmpx_write_entry: invalid type field"); | |
950 | return 0; | |
951 | } | |
952 | } | |
953 | #endif /* USE_UTMPX */ | |
954 | ||
955 | ||
956 | /** | |
957 | ** Low-level wtmp functions | |
958 | **/ | |
959 | ||
960 | #ifdef USE_WTMP | |
961 | ||
962 | /* write a wtmp entry direct to the end of the file */ | |
963 | /* This is a slight modification of code in OpenBSD's logwtmp.c */ | |
964 | static int | |
965 | wtmp_write(struct logininfo *li, struct utmp *ut) | |
966 | { | |
967 | struct stat buf; | |
968 | int fd, ret = 1; | |
969 | ||
970 | if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
971 | log("wtmp_write: problem writing %s: %s", | |
972 | WTMP_FILE, strerror(errno)); | |
973 | return 0; | |
974 | } | |
975 | if (fstat(fd, &buf) == 0) | |
976 | if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut)) { | |
977 | ftruncate(fd, buf.st_size); | |
978 | log("wtmp_write: problem writing %s: %s", | |
979 | WTMP_FILE, strerror(errno)); | |
980 | ret = 0; | |
981 | } | |
982 | (void)close(fd); | |
983 | return ret; | |
984 | } | |
985 | ||
986 | static int | |
987 | wtmp_perform_login(struct logininfo *li) | |
988 | { | |
989 | struct utmp ut; | |
990 | ||
991 | construct_utmp(li, &ut); | |
992 | return wtmp_write(li, &ut); | |
993 | } | |
994 | ||
995 | ||
996 | static int | |
997 | wtmp_perform_logout(struct logininfo *li) | |
998 | { | |
999 | struct utmp ut; | |
1000 | ||
1001 | construct_utmp(li, &ut); | |
1002 | return wtmp_write(li, &ut); | |
1003 | } | |
1004 | ||
1005 | ||
1006 | int | |
1007 | wtmp_write_entry(struct logininfo *li) | |
1008 | { | |
1009 | switch(li->type) { | |
1010 | case LTYPE_LOGIN: | |
1011 | return wtmp_perform_login(li); | |
1012 | case LTYPE_LOGOUT: | |
1013 | return wtmp_perform_logout(li); | |
1014 | default: | |
1015 | log("wtmp_write_entry: invalid type field"); | |
1016 | return 0; | |
1017 | } | |
1018 | } | |
1019 | ||
1020 | ||
1021 | /* Notes on fetching login data from wtmp/wtmpx | |
1022 | * | |
1023 | * Logouts are usually recorded with (amongst other things) a blank | |
1024 | * username on a given tty line. However, some systems (HP-UX is one) | |
1025 | * leave all fields set, but change the ut_type field to DEAD_PROCESS. | |
1026 | * | |
1027 | * Since we're only looking for logins here, we know that the username | |
1028 | * must be set correctly. On systems that leave it in, we check for | |
1029 | * ut_type==USER_PROCESS (indicating a login.) | |
1030 | * | |
1031 | * Portability: Some systems may set something other than USER_PROCESS | |
1032 | * to indicate a login process. I don't know of any as I write. Also, | |
1033 | * it's possible that some systems may both leave the username in | |
1034 | * place and not have ut_type. | |
1035 | */ | |
1036 | ||
1037 | /* return true if this wtmp entry indicates a login */ | |
1038 | static int | |
1039 | wtmp_islogin(struct logininfo *li, struct utmp *ut) | |
1040 | { | |
1041 | if (strncmp(li->username, ut->ut_name, | |
1042 | MIN_SIZEOF(li->username, ut->ut_name)) == 0) { | |
1043 | # ifdef HAVE_TYPE_IN_UTMP | |
1044 | if (ut->ut_type & USER_PROCESS) | |
1045 | return 1; | |
1046 | # else | |
1047 | return 1; | |
1048 | # endif | |
1049 | } | |
1050 | return 0; | |
1051 | } | |
1052 | ||
1053 | int | |
1054 | wtmp_get_entry(struct logininfo *li) | |
1055 | { | |
1056 | struct stat st; | |
1057 | struct utmp ut; | |
1058 | int fd, found=0; | |
1059 | ||
1060 | /* Clear the time entries in our logininfo */ | |
1061 | li->tv_sec = li->tv_usec = 0; | |
1062 | ||
1063 | if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) { | |
1064 | log("wtmp_get_entry: problem opening %s: %s", | |
1065 | WTMP_FILE, strerror(errno)); | |
1066 | return 0; | |
1067 | } | |
1068 | if (fstat(fd, &st) != 0) { | |
1069 | log("wtmp_get_entry: couldn't stat %s: %s", | |
1070 | WTMP_FILE, strerror(errno)); | |
1071 | close(fd); | |
1072 | return 0; | |
1073 | } | |
1074 | ||
1075 | /* Seek to the start of the last struct utmp */ | |
1076 | if (lseek(fd, (off_t)(0 - sizeof(struct utmp)), SEEK_END) == -1) { | |
1077 | /* Looks like we've got a fresh wtmp file */ | |
1078 | close(fd); | |
1079 | return 0; | |
1080 | } | |
1081 | ||
1082 | while (!found) { | |
1083 | if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) { | |
1084 | log("wtmp_get_entry: read of %s failed: %s", | |
1085 | WTMP_FILE, strerror(errno)); | |
1086 | close (fd); | |
1087 | return 0; | |
1088 | } | |
1089 | if ( wtmp_islogin(li, &ut) ) { | |
1090 | found = 1; | |
1091 | /* We've already checked for a time in struct | |
1092 | * utmp, in login_getlast(). */ | |
1093 | # ifdef HAVE_TIME_IN_UTMP | |
1094 | li->tv_sec = ut.ut_time; | |
1095 | # else | |
1096 | # if HAVE_TV_IN_UTMP | |
1097 | li->tv_sec = ut.ut_tv.tv_sec; | |
1098 | # endif | |
1099 | # endif | |
1100 | line_fullname(li->line, ut.ut_line, | |
1101 | MIN_SIZEOF(li->line, ut.ut_line)); | |
1102 | # ifdef HAVE_HOST_IN_UTMP | |
1103 | strlcpy(li->hostname, ut.ut_host, | |
1104 | MIN_SIZEOF(li->hostname, ut.ut_host)); | |
1105 | # endif | |
1106 | continue; | |
1107 | } | |
1108 | /* Seek back 2 x struct utmp */ | |
1109 | if (lseek(fd, (off_t)(0-2*sizeof(struct utmp)), SEEK_CUR) == -1) { | |
1110 | /* We've found the start of the file, so quit */ | |
1111 | close (fd); | |
1112 | return 0; | |
1113 | } | |
1114 | } | |
1115 | ||
1116 | /* We found an entry. Tidy up and return */ | |
1117 | close(fd); | |
1118 | return 1; | |
1119 | } | |
1120 | # endif /* USE_WTMP */ | |
1121 | ||
1122 | ||
1123 | /** | |
1124 | ** Low-level wtmpx functions | |
1125 | **/ | |
1126 | ||
1127 | #ifdef USE_WTMPX | |
1128 | /* write a wtmpx entry direct to the end of the file */ | |
1129 | /* This is a slight modification of code in OpenBSD's logwtmp.c */ | |
1130 | static int | |
1131 | wtmpx_write(struct logininfo *li, struct utmpx *utx) | |
1132 | { | |
1133 | struct stat buf; | |
1134 | int fd, ret = 1; | |
1135 | ||
1136 | if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
1137 | log("wtmpx_write: problem opening %s: %s", | |
1138 | WTMPX_FILE, strerror(errno)); | |
1139 | return 0; | |
1140 | } | |
1141 | ||
1142 | if (fstat(fd, &buf) == 0) | |
1143 | if (atomicio(write, fd, utx, sizeof(*utx)) != sizeof(*utx)) { | |
1144 | ftruncate(fd, buf.st_size); | |
1145 | log("wtmpx_write: problem writing %s: %s", | |
1146 | WTMPX_FILE, strerror(errno)); | |
1147 | ret = 0; | |
1148 | } | |
1149 | (void)close(fd); | |
1150 | ||
1151 | return ret; | |
1152 | } | |
1153 | ||
1154 | ||
1155 | static int | |
1156 | wtmpx_perform_login(struct logininfo *li) | |
1157 | { | |
1158 | struct utmpx utx; | |
1159 | ||
1160 | construct_utmpx(li, &utx); | |
1161 | return wtmpx_write(li, &utx); | |
1162 | } | |
1163 | ||
1164 | ||
1165 | static int | |
1166 | wtmpx_perform_logout(struct logininfo *li) | |
1167 | { | |
1168 | struct utmpx utx; | |
1169 | ||
1170 | construct_utmpx(li, &utx); | |
1171 | return wtmpx_write(li, &utx); | |
1172 | } | |
1173 | ||
1174 | ||
1175 | int | |
1176 | wtmpx_write_entry(struct logininfo *li) | |
1177 | { | |
1178 | switch(li->type) { | |
1179 | case LTYPE_LOGIN: | |
1180 | return wtmpx_perform_login(li); | |
1181 | case LTYPE_LOGOUT: | |
1182 | return wtmpx_perform_logout(li); | |
1183 | default: | |
1184 | log("wtmpx_write_entry: invalid type field"); | |
1185 | return 0; | |
1186 | } | |
1187 | } | |
1188 | ||
1189 | /* Please see the notes above wtmp_islogin() for information about the | |
1190 | next two functions */ | |
1191 | ||
1192 | /* Return true if this wtmpx entry indicates a login */ | |
1193 | static int | |
1194 | wtmpx_islogin(struct logininfo *li, struct utmpx *utx) | |
1195 | { | |
1196 | if ( strncmp(li->username, utx->ut_name, | |
1197 | MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) { | |
1198 | # ifdef HAVE_TYPE_IN_UTMPX | |
1199 | if (utx->ut_type == USER_PROCESS) | |
1200 | return 1; | |
1201 | # else | |
1202 | return 1; | |
1203 | # endif | |
1204 | } | |
1205 | return 0; | |
1206 | } | |
1207 | ||
1208 | ||
1209 | int | |
1210 | wtmpx_get_entry(struct logininfo *li) | |
1211 | { | |
1212 | struct stat st; | |
1213 | struct utmpx utx; | |
1214 | int fd, found=0; | |
1215 | ||
1216 | /* Clear the time entries */ | |
1217 | li->tv_sec = li->tv_usec = 0; | |
1218 | ||
1219 | if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) { | |
1220 | log("wtmpx_get_entry: problem opening %s: %s", | |
1221 | WTMPX_FILE, strerror(errno)); | |
1222 | return 0; | |
1223 | } | |
1224 | if (fstat(fd, &st) != 0) { | |
1225 | log("wtmpx_get_entry: couldn't stat %s: %s", | |
1226 | WTMP_FILE, strerror(errno)); | |
1227 | close(fd); | |
1228 | return 0; | |
1229 | } | |
1230 | ||
1231 | /* Seek to the start of the last struct utmpx */ | |
1232 | if (lseek(fd, (off_t)(0-sizeof(struct utmpx)), SEEK_END) == -1 ) { | |
1233 | /* probably a newly rotated wtmpx file */ | |
1234 | close(fd); | |
1235 | return 0; | |
1236 | } | |
1237 | ||
1238 | while (!found) { | |
1239 | if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) { | |
1240 | log("wtmpx_get_entry: read of %s failed: %s", | |
1241 | WTMPX_FILE, strerror(errno)); | |
1242 | close (fd); | |
1243 | return 0; | |
1244 | } | |
1245 | /* Logouts are recorded as a blank username on a particular line. | |
1246 | * So, we just need to find the username in struct utmpx */ | |
1247 | if ( wtmpx_islogin(li, &utx) ) { | |
1248 | # ifdef HAVE_TV_IN_UTMPX | |
1249 | li->tv_sec = utx.ut_tv.tv_sec; | |
1250 | # else | |
1251 | # ifdef HAVE_TIME_IN_UTMPX | |
1252 | li->tv_sec = utx.ut_time; | |
1253 | # endif | |
1254 | # endif | |
1255 | line_fullname(li->line, utx.ut_line, sizeof(li->line)); | |
1256 | # ifdef HAVE_HOST_IN_UTMPX | |
1257 | strlcpy(li->hostname, utx.ut_host, | |
1258 | MIN_SIZEOF(li->hostname, utx.ut_host)); | |
1259 | # endif | |
1260 | continue; | |
1261 | } | |
1262 | if (lseek(fd, (off_t)(0-2*sizeof(struct utmpx)), SEEK_CUR) == -1) { | |
1263 | close (fd); | |
1264 | return 0; | |
1265 | } | |
1266 | } | |
1267 | ||
1268 | close(fd); | |
1269 | return 1; | |
1270 | } | |
1271 | #endif /* USE_WTMPX */ | |
1272 | ||
1273 | /** | |
1274 | ** Low-level libutil login() functions | |
1275 | **/ | |
1276 | ||
1277 | #ifdef USE_LOGIN | |
1278 | static int | |
1279 | syslogin_perform_login(struct logininfo *li) | |
1280 | { | |
1281 | struct utmp *ut; | |
1282 | ||
1283 | if (! (ut = (struct utmp *)malloc(sizeof(*ut)))) { | |
1284 | log("syslogin_perform_login: couldn't malloc()"); | |
1285 | return 0; | |
1286 | } | |
1287 | construct_utmp(li, ut); | |
1288 | login(ut); | |
1289 | ||
1290 | return 1; | |
1291 | } | |
1292 | ||
1293 | static int | |
1294 | syslogin_perform_logout(struct logininfo *li) | |
1295 | { | |
1296 | # ifdef HAVE_LOGOUT | |
1297 | char line[8]; | |
1298 | ||
1299 | (void)line_stripname(line, li->line, sizeof(line)); | |
1300 | ||
1301 | if (!logout(line)) { | |
1302 | log("syslogin_perform_logout: logout() returned an error"); | |
1303 | # ifdef HAVE_LOGWTMP | |
1304 | } else { | |
1305 | logwtmp(line, "", ""); | |
1306 | # endif | |
1307 | } | |
1308 | /* FIXME: (ATL - if the need arises) What to do if we have | |
1309 | * login, but no logout? what if logout but no logwtmp? All | |
1310 | * routines are in libutil so they should all be there, | |
1311 | * but... */ | |
1312 | # endif | |
1313 | return 1; | |
1314 | } | |
1315 | ||
1316 | int | |
1317 | syslogin_write_entry(struct logininfo *li) | |
1318 | { | |
1319 | switch (li->type) { | |
1320 | case LTYPE_LOGIN: | |
1321 | return syslogin_perform_login(li); | |
1322 | case LTYPE_LOGOUT: | |
1323 | return syslogin_perform_logout(li); | |
1324 | default: | |
1325 | log("syslogin_write_entry: Invalid type field"); | |
1326 | return 0; | |
1327 | } | |
1328 | } | |
1329 | #endif /* USE_LOGIN */ | |
1330 | ||
1331 | /* end of file log-syslogin.c */ | |
1332 | ||
1333 | /** | |
1334 | ** Low-level lastlog functions | |
1335 | **/ | |
1336 | ||
1337 | #ifdef USE_LASTLOG | |
1338 | #define LL_FILE 1 | |
1339 | #define LL_DIR 2 | |
1340 | #define LL_OTHER 3 | |
1341 | ||
1342 | static void | |
1343 | lastlog_construct(struct logininfo *li, struct lastlog *last) | |
1344 | { | |
1345 | /* clear the structure */ | |
1346 | memset(last, '\0', sizeof(*last)); | |
1347 | ||
1348 | (void)line_stripname(last->ll_line, li->line, sizeof(last->ll_line)); | |
1349 | strlcpy(last->ll_host, li->hostname, | |
1350 | MIN_SIZEOF(last->ll_host, li->hostname)); | |
1351 | last->ll_time = li->tv_sec; | |
1352 | } | |
1353 | ||
1354 | static int | |
1355 | lastlog_filetype(char *filename) | |
1356 | { | |
1357 | struct stat st; | |
1358 | ||
1359 | if (stat(LASTLOG_FILE, &st) != 0) { | |
1360 | log("lastlog_perform_login: Couldn't stat %s: %s", LASTLOG_FILE, | |
1361 | strerror(errno)); | |
1362 | return 0; | |
1363 | } | |
1364 | if (S_ISDIR(st.st_mode)) | |
1365 | return LL_DIR; | |
1366 | else if (S_ISREG(st.st_mode)) | |
1367 | return LL_FILE; | |
1368 | else | |
1369 | return LL_OTHER; | |
1370 | } | |
1371 | ||
1372 | ||
1373 | /* open the file (using filemode) and seek to the login entry */ | |
1374 | static int | |
1375 | lastlog_openseek(struct logininfo *li, int *fd, int filemode) | |
1376 | { | |
1377 | off_t offset; | |
1378 | int type; | |
1379 | char lastlog_file[1024]; | |
1380 | ||
1381 | type = lastlog_filetype(LASTLOG_FILE); | |
1382 | switch (type) { | |
1383 | case LL_FILE: | |
1384 | strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file)); | |
1385 | break; | |
1386 | case LL_DIR: | |
1387 | snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s", | |
1388 | LASTLOG_FILE, li->username); | |
1389 | break; | |
1390 | default: | |
1391 | log("lastlog_openseek: %.100s is not a file or directory!", | |
1392 | LASTLOG_FILE); | |
1393 | return 0; | |
1394 | } | |
1395 | ||
1396 | *fd = open(lastlog_file, filemode); | |
1397 | if ( *fd < 0) { | |
1398 | debug("lastlog_openseek: Couldn't open %s: %s", | |
1399 | lastlog_file, strerror(errno)); | |
1400 | return 0; | |
1401 | } | |
1402 | ||
1403 | if (type == LL_FILE) { | |
1404 | /* find this uid's offset in the lastlog file */ | |
1405 | offset = (off_t) ( (long)li->uid * sizeof(struct lastlog)); | |
1406 | ||
1407 | if ( lseek(*fd, offset, SEEK_SET) != offset ) { | |
1408 | log("lastlog_openseek: %s->lseek(): %s", | |
1409 | lastlog_file, strerror(errno)); | |
1410 | return 0; | |
1411 | } | |
1412 | } | |
1413 | ||
1414 | return 1; | |
1415 | } | |
1416 | ||
1417 | static int | |
1418 | lastlog_perform_login(struct logininfo *li) | |
1419 | { | |
1420 | struct lastlog last; | |
1421 | int fd; | |
1422 | ||
1423 | /* create our struct lastlog */ | |
1424 | lastlog_construct(li, &last); | |
1425 | ||
1426 | if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT)) | |
1427 | return(0); | |
1428 | ||
1429 | /* write the entry */ | |
1430 | if (atomicio(write, fd, &last, sizeof(last)) != sizeof(last)) { | |
1431 | close(fd); | |
1432 | log("lastlog_write_filemode: Error writing to %s: %s", | |
1433 | LASTLOG_FILE, strerror(errno)); | |
1434 | return 0; | |
1435 | } | |
1436 | ||
1437 | close(fd); | |
1438 | return 1; | |
1439 | } | |
1440 | ||
1441 | int | |
1442 | lastlog_write_entry(struct logininfo *li) | |
1443 | { | |
1444 | switch(li->type) { | |
1445 | case LTYPE_LOGIN: | |
1446 | return lastlog_perform_login(li); | |
1447 | default: | |
1448 | log("lastlog_write_entry: Invalid type field"); | |
1449 | return 0; | |
1450 | } | |
1451 | } | |
1452 | ||
1453 | static void | |
1454 | lastlog_populate_entry(struct logininfo *li, struct lastlog *last) | |
1455 | { | |
1456 | line_fullname(li->line, last->ll_line, sizeof(li->line)); | |
1457 | strlcpy(li->hostname, last->ll_host, | |
1458 | MIN_SIZEOF(li->hostname, last->ll_host)); | |
1459 | li->tv_sec = last->ll_time; | |
1460 | } | |
1461 | ||
1462 | int | |
1463 | lastlog_get_entry(struct logininfo *li) | |
1464 | { | |
1465 | struct lastlog last; | |
1466 | int fd; | |
1467 | ||
1468 | if (lastlog_openseek(li, &fd, O_RDONLY)) { | |
1469 | if (atomicio(read, fd, &last, sizeof(last)) != sizeof(last)) { | |
1470 | log("lastlog_get_entry: Error reading from %s: %s", | |
1471 | LASTLOG_FILE, strerror(errno)); | |
1472 | return 0; | |
1473 | } else { | |
1474 | lastlog_populate_entry(li, &last); | |
1475 | return 1; | |
1476 | } | |
1477 | } else { | |
1478 | return 0; | |
1479 | } | |
1480 | } | |
1481 | #endif /* USE_LASTLOG */ |