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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 | * The btmp logging code is derived from login.c from util-linux and is under | |
30 | * the the following license: | |
31 | * | |
32 | * Copyright (c) 1980, 1987, 1988 The Regents of the University of California. | |
33 | * All rights reserved. | |
34 | * | |
35 | * Redistribution and use in source and binary forms are permitted | |
36 | * provided that the above copyright notice and this paragraph are | |
37 | * duplicated in all such forms and that any documentation, | |
38 | * advertising materials, and other materials related to such | |
39 | * distribution and use acknowledge that the software was developed | |
40 | * by the University of California, Berkeley. The name of the | |
41 | * University may not be used to endorse or promote products derived | |
42 | * from this software without specific prior written permission. | |
43 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
44 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
45 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
46 | */ | |
47 | ||
48 | ||
49 | /** | |
50 | ** loginrec.c: platform-independent login recording and lastlog retrieval | |
51 | **/ | |
52 | ||
53 | /* | |
54 | * The new login code explained | |
55 | * ============================ | |
56 | * | |
57 | * This code attempts to provide a common interface to login recording | |
58 | * (utmp and friends) and last login time retrieval. | |
59 | * | |
60 | * Its primary means of achieving this is to use 'struct logininfo', a | |
61 | * union of all the useful fields in the various different types of | |
62 | * system login record structures one finds on UNIX variants. | |
63 | * | |
64 | * We depend on autoconf to define which recording methods are to be | |
65 | * used, and which fields are contained in the relevant data structures | |
66 | * on the local system. Many C preprocessor symbols affect which code | |
67 | * gets compiled here. | |
68 | * | |
69 | * The code is designed to make it easy to modify a particular | |
70 | * recording method, without affecting other methods nor requiring so | |
71 | * many nested conditional compilation blocks as were commonplace in | |
72 | * the old code. | |
73 | * | |
74 | * For login recording, we try to use the local system's libraries as | |
75 | * these are clearly most likely to work correctly. For utmp systems | |
76 | * this usually means login() and logout() or setutent() etc., probably | |
77 | * in libutil, along with logwtmp() etc. On these systems, we fall back | |
78 | * to writing the files directly if we have to, though this method | |
79 | * requires very thorough testing so we do not corrupt local auditing | |
80 | * information. These files and their access methods are very system | |
81 | * specific indeed. | |
82 | * | |
83 | * For utmpx systems, the corresponding library functions are | |
84 | * setutxent() etc. To the author's knowledge, all utmpx systems have | |
85 | * these library functions and so no direct write is attempted. If such | |
86 | * a system exists and needs support, direct analogues of the [uw]tmp | |
87 | * code should suffice. | |
88 | * | |
89 | * Retrieving the time of last login ('lastlog') is in some ways even | |
90 | * more problemmatic than login recording. Some systems provide a | |
91 | * simple table of all users which we seek based on uid and retrieve a | |
92 | * relatively standard structure. Others record the same information in | |
93 | * a directory with a separate file, and others don't record the | |
94 | * information separately at all. For systems in the latter category, | |
95 | * we look backwards in the wtmp or wtmpx file for the last login entry | |
96 | * for our user. Naturally this is slower and on busy systems could | |
97 | * incur a significant performance penalty. | |
98 | * | |
99 | * Calling the new code | |
100 | * -------------------- | |
101 | * | |
102 | * In OpenSSH all login recording and retrieval is performed in | |
103 | * login.c. Here you'll find working examples. Also, in the logintest.c | |
104 | * program there are more examples. | |
105 | * | |
106 | * Internal handler calling method | |
107 | * ------------------------------- | |
108 | * | |
109 | * When a call is made to login_login() or login_logout(), both | |
110 | * routines set a struct logininfo flag defining which action (log in, | |
111 | * or log out) is to be taken. They both then call login_write(), which | |
112 | * calls whichever of the many structure-specific handlers autoconf | |
113 | * selects for the local system. | |
114 | * | |
115 | * The handlers themselves handle system data structure specifics. Both | |
116 | * struct utmp and struct utmpx have utility functions (see | |
117 | * construct_utmp*()) to try to make it simpler to add extra systems | |
118 | * that introduce new features to either structure. | |
119 | * | |
120 | * While it may seem terribly wasteful to replicate so much similar | |
121 | * code for each method, experience has shown that maintaining code to | |
122 | * write both struct utmp and utmpx in one function, whilst maintaining | |
123 | * support for all systems whether they have library support or not, is | |
124 | * a difficult and time-consuming task. | |
125 | * | |
126 | * Lastlog support proceeds similarly. Functions login_get_lastlog() | |
127 | * (and its OpenSSH-tuned friend login_get_lastlog_time()) call | |
128 | * getlast_entry(), which tries one of three methods to find the last | |
129 | * login time. It uses local system lastlog support if it can, | |
130 | * otherwise it tries wtmp or wtmpx before giving up and returning 0, | |
131 | * meaning "tilt". | |
132 | * | |
133 | * Maintenance | |
134 | * ----------- | |
135 | * | |
136 | * In many cases it's possible to tweak autoconf to select the correct | |
137 | * methods for a particular platform, either by improving the detection | |
138 | * code (best), or by presetting DISABLE_<method> or CONF_<method>_FILE | |
139 | * symbols for the platform. | |
140 | * | |
141 | * Use logintest to check which symbols are defined before modifying | |
142 | * configure.ac and loginrec.c. (You have to build logintest yourself | |
143 | * with 'make logintest' as it's not built by default.) | |
144 | * | |
145 | * Otherwise, patches to the specific method(s) are very helpful! | |
146 | */ | |
147 | ||
148 | #include "includes.h" | |
149 | ||
150 | #include <sys/types.h> | |
151 | #include <sys/stat.h> | |
152 | #include <sys/socket.h> | |
153 | ||
154 | #include <netinet/in.h> | |
155 | ||
156 | #include <errno.h> | |
157 | #include <fcntl.h> | |
158 | #ifdef HAVE_PATHS_H | |
159 | # include <paths.h> | |
160 | #endif | |
161 | #include <pwd.h> | |
162 | #include <stdarg.h> | |
163 | #include <string.h> | |
164 | #include <time.h> | |
165 | #include <unistd.h> | |
166 | ||
167 | #include "xmalloc.h" | |
168 | #include "key.h" | |
169 | #include "hostfile.h" | |
170 | #include "ssh.h" | |
171 | #include "loginrec.h" | |
172 | #include "log.h" | |
173 | #include "atomicio.h" | |
174 | #include "packet.h" | |
175 | #include "canohost.h" | |
176 | #include "auth.h" | |
177 | #include "buffer.h" | |
178 | ||
179 | #ifdef HAVE_UTIL_H | |
180 | # include <util.h> | |
181 | #endif | |
182 | ||
183 | #ifdef HAVE_LIBUTIL_H | |
184 | # include <libutil.h> | |
185 | #endif | |
186 | ||
187 | /** | |
188 | ** prototypes for helper functions in this file | |
189 | **/ | |
190 | ||
191 | #if HAVE_UTMP_H | |
192 | void set_utmp_time(struct logininfo *li, struct utmp *ut); | |
193 | void construct_utmp(struct logininfo *li, struct utmp *ut); | |
194 | #endif | |
195 | ||
196 | #ifdef HAVE_UTMPX_H | |
197 | void set_utmpx_time(struct logininfo *li, struct utmpx *ut); | |
198 | void construct_utmpx(struct logininfo *li, struct utmpx *ut); | |
199 | #endif | |
200 | ||
201 | int utmp_write_entry(struct logininfo *li); | |
202 | int utmpx_write_entry(struct logininfo *li); | |
203 | int wtmp_write_entry(struct logininfo *li); | |
204 | int wtmpx_write_entry(struct logininfo *li); | |
205 | int lastlog_write_entry(struct logininfo *li); | |
206 | int syslogin_write_entry(struct logininfo *li); | |
207 | ||
208 | int getlast_entry(struct logininfo *li); | |
209 | int lastlog_get_entry(struct logininfo *li); | |
210 | int wtmp_get_entry(struct logininfo *li); | |
211 | int wtmpx_get_entry(struct logininfo *li); | |
212 | ||
213 | extern Buffer loginmsg; | |
214 | ||
215 | /* pick the shortest string */ | |
216 | #define MIN_SIZEOF(s1,s2) (sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2)) | |
217 | ||
218 | /** | |
219 | ** platform-independent login functions | |
220 | **/ | |
221 | ||
222 | /* | |
223 | * login_login(struct logininfo *) - Record a login | |
224 | * | |
225 | * Call with a pointer to a struct logininfo initialised with | |
226 | * login_init_entry() or login_alloc_entry() | |
227 | * | |
228 | * Returns: | |
229 | * >0 if successful | |
230 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
231 | */ | |
232 | int | |
233 | login_login(struct logininfo *li) | |
234 | { | |
235 | li->type = LTYPE_LOGIN; | |
236 | return (login_write(li)); | |
237 | } | |
238 | ||
239 | ||
240 | /* | |
241 | * login_logout(struct logininfo *) - Record a logout | |
242 | * | |
243 | * Call as with login_login() | |
244 | * | |
245 | * Returns: | |
246 | * >0 if successful | |
247 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
248 | */ | |
249 | int | |
250 | login_logout(struct logininfo *li) | |
251 | { | |
252 | li->type = LTYPE_LOGOUT; | |
253 | return (login_write(li)); | |
254 | } | |
255 | ||
256 | /* | |
257 | * login_get_lastlog_time(int) - Retrieve the last login time | |
258 | * | |
259 | * Retrieve the last login time for the given uid. Will try to use the | |
260 | * system lastlog facilities if they are available, but will fall back | |
261 | * to looking in wtmp/wtmpx if necessary | |
262 | * | |
263 | * Returns: | |
264 | * 0 on failure, or if user has never logged in | |
265 | * Time in seconds from the epoch if successful | |
266 | * | |
267 | * Useful preprocessor symbols: | |
268 | * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog | |
269 | * info | |
270 | * USE_LASTLOG: If set, indicates the presence of system lastlog | |
271 | * facilities. If this and DISABLE_LASTLOG are not set, | |
272 | * try to retrieve lastlog information from wtmp/wtmpx. | |
273 | */ | |
274 | unsigned int | |
275 | login_get_lastlog_time(const int uid) | |
276 | { | |
277 | struct logininfo li; | |
278 | ||
279 | if (login_get_lastlog(&li, uid)) | |
280 | return (li.tv_sec); | |
281 | else | |
282 | return (0); | |
283 | } | |
284 | ||
285 | /* | |
286 | * login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry | |
287 | * | |
288 | * Retrieve a logininfo structure populated (only partially) with | |
289 | * information from the system lastlog data, or from wtmp/wtmpx if no | |
290 | * system lastlog information exists. | |
291 | * | |
292 | * Note this routine must be given a pre-allocated logininfo. | |
293 | * | |
294 | * Returns: | |
295 | * >0: A pointer to your struct logininfo if successful | |
296 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
297 | */ | |
298 | struct logininfo * | |
299 | login_get_lastlog(struct logininfo *li, const int uid) | |
300 | { | |
301 | struct passwd *pw; | |
302 | ||
303 | memset(li, '\0', sizeof(*li)); | |
304 | li->uid = uid; | |
305 | ||
306 | /* | |
307 | * If we don't have a 'real' lastlog, we need the username to | |
308 | * reliably search wtmp(x) for the last login (see | |
309 | * wtmp_get_entry().) | |
310 | */ | |
311 | pw = getpwuid(uid); | |
312 | if (pw == NULL) | |
313 | fatal("%s: Cannot find account for uid %i", __func__, uid); | |
314 | ||
315 | /* No MIN_SIZEOF here - we absolutely *must not* truncate the | |
316 | * username (XXX - so check for trunc!) */ | |
317 | strlcpy(li->username, pw->pw_name, sizeof(li->username)); | |
318 | ||
319 | if (getlast_entry(li)) | |
320 | return (li); | |
321 | else | |
322 | return (NULL); | |
323 | } | |
324 | ||
325 | ||
326 | /* | |
327 | * login_alloc_entry(int, char*, char*, char*) - Allocate and initialise | |
328 | * a logininfo structure | |
329 | * | |
330 | * This function creates a new struct logininfo, a data structure | |
331 | * meant to carry the information required to portably record login info. | |
332 | * | |
333 | * Returns a pointer to a newly created struct logininfo. If memory | |
334 | * allocation fails, the program halts. | |
335 | */ | |
336 | struct | |
337 | logininfo *login_alloc_entry(int pid, const char *username, | |
338 | const char *hostname, const char *line) | |
339 | { | |
340 | struct logininfo *newli; | |
341 | ||
342 | newli = xmalloc(sizeof(*newli)); | |
343 | login_init_entry(newli, pid, username, hostname, line); | |
344 | return (newli); | |
345 | } | |
346 | ||
347 | ||
348 | /* login_free_entry(struct logininfo *) - free struct memory */ | |
349 | void | |
350 | login_free_entry(struct logininfo *li) | |
351 | { | |
352 | xfree(li); | |
353 | } | |
354 | ||
355 | ||
356 | /* login_init_entry(struct logininfo *, int, char*, char*, char*) | |
357 | * - initialise a struct logininfo | |
358 | * | |
359 | * Populates a new struct logininfo, a data structure meant to carry | |
360 | * the information required to portably record login info. | |
361 | * | |
362 | * Returns: 1 | |
363 | */ | |
364 | int | |
365 | login_init_entry(struct logininfo *li, int pid, const char *username, | |
366 | const char *hostname, const char *line) | |
367 | { | |
368 | struct passwd *pw; | |
369 | ||
370 | memset(li, 0, sizeof(*li)); | |
371 | ||
372 | li->pid = pid; | |
373 | ||
374 | /* set the line information */ | |
375 | if (line) | |
376 | line_fullname(li->line, line, sizeof(li->line)); | |
377 | ||
378 | if (username) { | |
379 | strlcpy(li->username, username, sizeof(li->username)); | |
380 | pw = getpwnam(li->username); | |
381 | if (pw == NULL) { | |
382 | fatal("%s: Cannot find user \"%s\"", __func__, | |
383 | li->username); | |
384 | } | |
385 | li->uid = pw->pw_uid; | |
386 | } | |
387 | ||
388 | if (hostname) | |
389 | strlcpy(li->hostname, hostname, sizeof(li->hostname)); | |
390 | ||
391 | return (1); | |
392 | } | |
393 | ||
394 | /* | |
395 | * login_set_current_time(struct logininfo *) - set the current time | |
396 | * | |
397 | * Set the current time in a logininfo structure. This function is | |
398 | * meant to eliminate the need to deal with system dependencies for | |
399 | * time handling. | |
400 | */ | |
401 | void | |
402 | login_set_current_time(struct logininfo *li) | |
403 | { | |
404 | struct timeval tv; | |
405 | ||
406 | gettimeofday(&tv, NULL); | |
407 | ||
408 | li->tv_sec = tv.tv_sec; | |
409 | li->tv_usec = tv.tv_usec; | |
410 | } | |
411 | ||
412 | /* copy a sockaddr_* into our logininfo */ | |
413 | void | |
414 | login_set_addr(struct logininfo *li, const struct sockaddr *sa, | |
415 | const unsigned int sa_size) | |
416 | { | |
417 | unsigned int bufsize = sa_size; | |
418 | ||
419 | /* make sure we don't overrun our union */ | |
420 | if (sizeof(li->hostaddr) < sa_size) | |
421 | bufsize = sizeof(li->hostaddr); | |
422 | ||
423 | memcpy(&li->hostaddr.sa, sa, bufsize); | |
424 | } | |
425 | ||
426 | ||
427 | /** | |
428 | ** login_write: Call low-level recording functions based on autoconf | |
429 | ** results | |
430 | **/ | |
431 | int | |
432 | login_write(struct logininfo *li) | |
433 | { | |
434 | #ifndef HAVE_CYGWIN | |
435 | if (geteuid() != 0) { | |
436 | logit("Attempt to write login records by non-root user (aborting)"); | |
437 | return (1); | |
438 | } | |
439 | #endif | |
440 | ||
441 | /* set the timestamp */ | |
442 | login_set_current_time(li); | |
443 | #ifdef USE_LOGIN | |
444 | syslogin_write_entry(li); | |
445 | #endif | |
446 | #ifdef USE_LASTLOG | |
447 | if (li->type == LTYPE_LOGIN) | |
448 | lastlog_write_entry(li); | |
449 | #endif | |
450 | #ifdef USE_UTMP | |
451 | utmp_write_entry(li); | |
452 | #endif | |
453 | #ifdef USE_WTMP | |
454 | wtmp_write_entry(li); | |
455 | #endif | |
456 | #ifdef USE_UTMPX | |
457 | utmpx_write_entry(li); | |
458 | #endif | |
459 | #ifdef USE_WTMPX | |
460 | wtmpx_write_entry(li); | |
461 | #endif | |
462 | #ifdef CUSTOM_SYS_AUTH_RECORD_LOGIN | |
463 | if (li->type == LTYPE_LOGIN && | |
464 | !sys_auth_record_login(li->username,li->hostname,li->line, | |
465 | &loginmsg)) | |
466 | logit("Writing login record failed for %s", li->username); | |
467 | #endif | |
468 | #ifdef SSH_AUDIT_EVENTS | |
469 | if (li->type == LTYPE_LOGIN) | |
470 | audit_session_open(li->line); | |
471 | else if (li->type == LTYPE_LOGOUT) | |
472 | audit_session_close(li->line); | |
473 | #endif | |
474 | return (0); | |
475 | } | |
476 | ||
477 | #ifdef LOGIN_NEEDS_UTMPX | |
478 | int | |
479 | login_utmp_only(struct logininfo *li) | |
480 | { | |
481 | li->type = LTYPE_LOGIN; | |
482 | login_set_current_time(li); | |
483 | # ifdef USE_UTMP | |
484 | utmp_write_entry(li); | |
485 | # endif | |
486 | # ifdef USE_WTMP | |
487 | wtmp_write_entry(li); | |
488 | # endif | |
489 | # ifdef USE_UTMPX | |
490 | utmpx_write_entry(li); | |
491 | # endif | |
492 | # ifdef USE_WTMPX | |
493 | wtmpx_write_entry(li); | |
494 | # endif | |
495 | return (0); | |
496 | } | |
497 | #endif | |
498 | ||
499 | /** | |
500 | ** getlast_entry: Call low-level functions to retrieve the last login | |
501 | ** time. | |
502 | **/ | |
503 | ||
504 | /* take the uid in li and return the last login time */ | |
505 | int | |
506 | getlast_entry(struct logininfo *li) | |
507 | { | |
508 | #ifdef USE_LASTLOG | |
509 | return(lastlog_get_entry(li)); | |
510 | #else /* !USE_LASTLOG */ | |
511 | ||
512 | #if defined(DISABLE_LASTLOG) | |
513 | /* On some systems we shouldn't even try to obtain last login | |
514 | * time, e.g. AIX */ | |
515 | return (0); | |
516 | # elif defined(USE_WTMP) && \ | |
517 | (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) | |
518 | /* retrieve last login time from utmp */ | |
519 | return (wtmp_get_entry(li)); | |
520 | # elif defined(USE_WTMPX) && \ | |
521 | (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX)) | |
522 | /* If wtmp isn't available, try wtmpx */ | |
523 | return (wtmpx_get_entry(li)); | |
524 | # else | |
525 | /* Give up: No means of retrieving last login time */ | |
526 | return (0); | |
527 | # endif /* DISABLE_LASTLOG */ | |
528 | #endif /* USE_LASTLOG */ | |
529 | } | |
530 | ||
531 | ||
532 | ||
533 | /* | |
534 | * 'line' string utility functions | |
535 | * | |
536 | * These functions process the 'line' string into one of three forms: | |
537 | * | |
538 | * 1. The full filename (including '/dev') | |
539 | * 2. The stripped name (excluding '/dev') | |
540 | * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00 | |
541 | * /dev/pts/1 -> ts/1 ) | |
542 | * | |
543 | * Form 3 is used on some systems to identify a .tmp.? entry when | |
544 | * attempting to remove it. Typically both addition and removal is | |
545 | * performed by one application - say, sshd - so as long as the choice | |
546 | * uniquely identifies a terminal it's ok. | |
547 | */ | |
548 | ||
549 | ||
550 | /* | |
551 | * line_fullname(): add the leading '/dev/' if it doesn't exist make | |
552 | * sure dst has enough space, if not just copy src (ugh) | |
553 | */ | |
554 | char * | |
555 | line_fullname(char *dst, const char *src, u_int dstsize) | |
556 | { | |
557 | memset(dst, '\0', dstsize); | |
558 | if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) | |
559 | strlcpy(dst, src, dstsize); | |
560 | else { | |
561 | strlcpy(dst, "/dev/", dstsize); | |
562 | strlcat(dst, src, dstsize); | |
563 | } | |
564 | return (dst); | |
565 | } | |
566 | ||
567 | /* line_stripname(): strip the leading '/dev' if it exists, return dst */ | |
568 | char * | |
569 | line_stripname(char *dst, const char *src, int dstsize) | |
570 | { | |
571 | memset(dst, '\0', dstsize); | |
572 | if (strncmp(src, "/dev/", 5) == 0) | |
573 | strlcpy(dst, src + 5, dstsize); | |
574 | else | |
575 | strlcpy(dst, src, dstsize); | |
576 | return (dst); | |
577 | } | |
578 | ||
579 | /* | |
580 | * line_abbrevname(): Return the abbreviated (usually four-character) | |
581 | * form of the line (Just use the last <dstsize> characters of the | |
582 | * full name.) | |
583 | * | |
584 | * NOTE: use strncpy because we do NOT necessarily want zero | |
585 | * termination | |
586 | */ | |
587 | char * | |
588 | line_abbrevname(char *dst, const char *src, int dstsize) | |
589 | { | |
590 | size_t len; | |
591 | ||
592 | memset(dst, '\0', dstsize); | |
593 | ||
594 | /* Always skip prefix if present */ | |
595 | if (strncmp(src, "/dev/", 5) == 0) | |
596 | src += 5; | |
597 | ||
598 | #ifdef WITH_ABBREV_NO_TTY | |
599 | if (strncmp(src, "tty", 3) == 0) | |
600 | src += 3; | |
601 | #endif | |
602 | ||
603 | len = strlen(src); | |
604 | ||
605 | if (len > 0) { | |
606 | if (((int)len - dstsize) > 0) | |
607 | src += ((int)len - dstsize); | |
608 | ||
609 | /* note: _don't_ change this to strlcpy */ | |
610 | strncpy(dst, src, (size_t)dstsize); | |
611 | } | |
612 | ||
613 | return (dst); | |
614 | } | |
615 | ||
616 | /** | |
617 | ** utmp utility functions | |
618 | ** | |
619 | ** These functions manipulate struct utmp, taking system differences | |
620 | ** into account. | |
621 | **/ | |
622 | ||
623 | #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN) | |
624 | ||
625 | /* build the utmp structure */ | |
626 | void | |
627 | set_utmp_time(struct logininfo *li, struct utmp *ut) | |
628 | { | |
629 | # if defined(HAVE_TV_IN_UTMP) | |
630 | ut->ut_tv.tv_sec = li->tv_sec; | |
631 | ut->ut_tv.tv_usec = li->tv_usec; | |
632 | # elif defined(HAVE_TIME_IN_UTMP) | |
633 | ut->ut_time = li->tv_sec; | |
634 | # endif | |
635 | } | |
636 | ||
637 | void | |
638 | construct_utmp(struct logininfo *li, | |
639 | struct utmp *ut) | |
640 | { | |
641 | # ifdef HAVE_ADDR_V6_IN_UTMP | |
642 | struct sockaddr_in6 *sa6; | |
643 | # endif | |
644 | ||
645 | memset(ut, '\0', sizeof(*ut)); | |
646 | ||
647 | /* First fill out fields used for both logins and logouts */ | |
648 | ||
649 | # ifdef HAVE_ID_IN_UTMP | |
650 | line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id)); | |
651 | # endif | |
652 | ||
653 | # ifdef HAVE_TYPE_IN_UTMP | |
654 | /* This is done here to keep utmp constants out of struct logininfo */ | |
655 | switch (li->type) { | |
656 | case LTYPE_LOGIN: | |
657 | ut->ut_type = USER_PROCESS; | |
658 | #ifdef _UNICOS | |
659 | cray_set_tmpdir(ut); | |
660 | #endif | |
661 | break; | |
662 | case LTYPE_LOGOUT: | |
663 | ut->ut_type = DEAD_PROCESS; | |
664 | #ifdef _UNICOS | |
665 | cray_retain_utmp(ut, li->pid); | |
666 | #endif | |
667 | break; | |
668 | } | |
669 | # endif | |
670 | set_utmp_time(li, ut); | |
671 | ||
672 | line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line)); | |
673 | ||
674 | # ifdef HAVE_PID_IN_UTMP | |
675 | ut->ut_pid = li->pid; | |
676 | # endif | |
677 | ||
678 | /* If we're logging out, leave all other fields blank */ | |
679 | if (li->type == LTYPE_LOGOUT) | |
680 | return; | |
681 | ||
682 | /* | |
683 | * These fields are only used when logging in, and are blank | |
684 | * for logouts. | |
685 | */ | |
686 | ||
687 | /* Use strncpy because we don't necessarily want null termination */ | |
688 | strncpy(ut->ut_name, li->username, | |
689 | MIN_SIZEOF(ut->ut_name, li->username)); | |
690 | # ifdef HAVE_HOST_IN_UTMP | |
691 | strncpy(ut->ut_host, li->hostname, | |
692 | MIN_SIZEOF(ut->ut_host, li->hostname)); | |
693 | # endif | |
694 | # ifdef HAVE_ADDR_IN_UTMP | |
695 | /* this is just a 32-bit IP address */ | |
696 | if (li->hostaddr.sa.sa_family == AF_INET) | |
697 | ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
698 | # endif | |
699 | # ifdef HAVE_ADDR_V6_IN_UTMP | |
700 | /* this is just a 128-bit IPv6 address */ | |
701 | if (li->hostaddr.sa.sa_family == AF_INET6) { | |
702 | sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa); | |
703 | memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16); | |
704 | if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) { | |
705 | ut->ut_addr_v6[0] = ut->ut_addr_v6[3]; | |
706 | ut->ut_addr_v6[1] = 0; | |
707 | ut->ut_addr_v6[2] = 0; | |
708 | ut->ut_addr_v6[3] = 0; | |
709 | } | |
710 | } | |
711 | # endif | |
712 | } | |
713 | #endif /* USE_UTMP || USE_WTMP || USE_LOGIN */ | |
714 | ||
715 | /** | |
716 | ** utmpx utility functions | |
717 | ** | |
718 | ** These functions manipulate struct utmpx, accounting for system | |
719 | ** variations. | |
720 | **/ | |
721 | ||
722 | #if defined(USE_UTMPX) || defined (USE_WTMPX) | |
723 | /* build the utmpx structure */ | |
724 | void | |
725 | set_utmpx_time(struct logininfo *li, struct utmpx *utx) | |
726 | { | |
727 | # if defined(HAVE_TV_IN_UTMPX) | |
728 | utx->ut_tv.tv_sec = li->tv_sec; | |
729 | utx->ut_tv.tv_usec = li->tv_usec; | |
730 | # elif defined(HAVE_TIME_IN_UTMPX) | |
731 | utx->ut_time = li->tv_sec; | |
732 | # endif | |
733 | } | |
734 | ||
735 | void | |
736 | construct_utmpx(struct logininfo *li, struct utmpx *utx) | |
737 | { | |
738 | # ifdef HAVE_ADDR_V6_IN_UTMP | |
739 | struct sockaddr_in6 *sa6; | |
740 | # endif | |
741 | memset(utx, '\0', sizeof(*utx)); | |
742 | ||
743 | # ifdef HAVE_ID_IN_UTMPX | |
744 | line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id)); | |
745 | # endif | |
746 | ||
747 | /* this is done here to keep utmp constants out of loginrec.h */ | |
748 | switch (li->type) { | |
749 | case LTYPE_LOGIN: | |
750 | utx->ut_type = USER_PROCESS; | |
751 | break; | |
752 | case LTYPE_LOGOUT: | |
753 | utx->ut_type = DEAD_PROCESS; | |
754 | break; | |
755 | } | |
756 | line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line)); | |
757 | set_utmpx_time(li, utx); | |
758 | utx->ut_pid = li->pid; | |
759 | ||
760 | /* strncpy(): Don't necessarily want null termination */ | |
761 | strncpy(utx->ut_user, li->username, | |
762 | MIN_SIZEOF(utx->ut_user, li->username)); | |
763 | ||
764 | if (li->type == LTYPE_LOGOUT) | |
765 | return; | |
766 | ||
767 | /* | |
768 | * These fields are only used when logging in, and are blank | |
769 | * for logouts. | |
770 | */ | |
771 | ||
772 | # ifdef HAVE_HOST_IN_UTMPX | |
773 | strncpy(utx->ut_host, li->hostname, | |
774 | MIN_SIZEOF(utx->ut_host, li->hostname)); | |
775 | # endif | |
776 | # ifdef HAVE_ADDR_IN_UTMPX | |
777 | /* this is just a 32-bit IP address */ | |
778 | if (li->hostaddr.sa.sa_family == AF_INET) | |
779 | utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
780 | # endif | |
781 | # ifdef HAVE_ADDR_V6_IN_UTMP | |
782 | /* this is just a 128-bit IPv6 address */ | |
783 | if (li->hostaddr.sa.sa_family == AF_INET6) { | |
784 | sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa); | |
785 | memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16); | |
786 | if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) { | |
787 | ut->ut_addr_v6[0] = ut->ut_addr_v6[3]; | |
788 | ut->ut_addr_v6[1] = 0; | |
789 | ut->ut_addr_v6[2] = 0; | |
790 | ut->ut_addr_v6[3] = 0; | |
791 | } | |
792 | } | |
793 | # endif | |
794 | # ifdef HAVE_SYSLEN_IN_UTMPX | |
795 | /* ut_syslen is the length of the utx_host string */ | |
796 | utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host)); | |
797 | # endif | |
798 | } | |
799 | #endif /* USE_UTMPX || USE_WTMPX */ | |
800 | ||
801 | /** | |
802 | ** Low-level utmp functions | |
803 | **/ | |
804 | ||
805 | /* FIXME: (ATL) utmp_write_direct needs testing */ | |
806 | #ifdef USE_UTMP | |
807 | ||
808 | /* if we can, use pututline() etc. */ | |
809 | # if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \ | |
810 | defined(HAVE_PUTUTLINE) | |
811 | # define UTMP_USE_LIBRARY | |
812 | # endif | |
813 | ||
814 | ||
815 | /* write a utmp entry with the system's help (pututline() and pals) */ | |
816 | # ifdef UTMP_USE_LIBRARY | |
817 | static int | |
818 | utmp_write_library(struct logininfo *li, struct utmp *ut) | |
819 | { | |
820 | setutent(); | |
821 | pututline(ut); | |
822 | # ifdef HAVE_ENDUTENT | |
823 | endutent(); | |
824 | # endif | |
825 | return (1); | |
826 | } | |
827 | # else /* UTMP_USE_LIBRARY */ | |
828 | ||
829 | /* | |
830 | * Write a utmp entry direct to the file | |
831 | * This is a slightly modification of code in OpenBSD's login.c | |
832 | */ | |
833 | static int | |
834 | utmp_write_direct(struct logininfo *li, struct utmp *ut) | |
835 | { | |
836 | struct utmp old_ut; | |
837 | register int fd; | |
838 | int tty; | |
839 | ||
840 | /* FIXME: (ATL) ttyslot() needs local implementation */ | |
841 | ||
842 | #if defined(HAVE_GETTTYENT) | |
843 | struct ttyent *ty; | |
844 | ||
845 | tty=0; | |
846 | setttyent(); | |
847 | while (NULL != (ty = getttyent())) { | |
848 | tty++; | |
849 | if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line))) | |
850 | break; | |
851 | } | |
852 | endttyent(); | |
853 | ||
854 | if (NULL == ty) { | |
855 | logit("%s: tty not found", __func__); | |
856 | return (0); | |
857 | } | |
858 | #else /* FIXME */ | |
859 | ||
860 | tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */ | |
861 | ||
862 | #endif /* HAVE_GETTTYENT */ | |
863 | ||
864 | if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) { | |
865 | off_t pos, ret; | |
866 | ||
867 | pos = (off_t)tty * sizeof(struct utmp); | |
868 | if ((ret = lseek(fd, pos, SEEK_SET)) == -1) { | |
869 | logit("%s: lseek: %s", __func__, strerror(errno)); | |
870 | return (0); | |
871 | } | |
872 | if (ret != pos) { | |
873 | logit("%s: Couldn't seek to tty %d slot in %s", | |
874 | __func__, tty, UTMP_FILE); | |
875 | return (0); | |
876 | } | |
877 | /* | |
878 | * Prevent luser from zero'ing out ut_host. | |
879 | * If the new ut_line is empty but the old one is not | |
880 | * and ut_line and ut_name match, preserve the old ut_line. | |
881 | */ | |
882 | if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) && | |
883 | (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') && | |
884 | (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) && | |
885 | (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) | |
886 | memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host)); | |
887 | ||
888 | if ((ret = lseek(fd, pos, SEEK_SET)) == -1) { | |
889 | logit("%s: lseek: %s", __func__, strerror(errno)); | |
890 | return (0); | |
891 | } | |
892 | if (ret != pos) { | |
893 | logit("%s: Couldn't seek to tty %d slot in %s", | |
894 | __func__, tty, UTMP_FILE); | |
895 | return (0); | |
896 | } | |
897 | if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) { | |
898 | logit("%s: error writing %s: %s", __func__, | |
899 | UTMP_FILE, strerror(errno)); | |
900 | } | |
901 | ||
902 | close(fd); | |
903 | return (1); | |
904 | } else { | |
905 | return (0); | |
906 | } | |
907 | } | |
908 | # endif /* UTMP_USE_LIBRARY */ | |
909 | ||
910 | static int | |
911 | utmp_perform_login(struct logininfo *li) | |
912 | { | |
913 | struct utmp ut; | |
914 | ||
915 | construct_utmp(li, &ut); | |
916 | # ifdef UTMP_USE_LIBRARY | |
917 | if (!utmp_write_library(li, &ut)) { | |
918 | logit("%s: utmp_write_library() failed", __func__); | |
919 | return (0); | |
920 | } | |
921 | # else | |
922 | if (!utmp_write_direct(li, &ut)) { | |
923 | logit("%s: utmp_write_direct() failed", __func__); | |
924 | return (0); | |
925 | } | |
926 | # endif | |
927 | return (1); | |
928 | } | |
929 | ||
930 | ||
931 | static int | |
932 | utmp_perform_logout(struct logininfo *li) | |
933 | { | |
934 | struct utmp ut; | |
935 | ||
936 | construct_utmp(li, &ut); | |
937 | # ifdef UTMP_USE_LIBRARY | |
938 | if (!utmp_write_library(li, &ut)) { | |
939 | logit("%s: utmp_write_library() failed", __func__); | |
940 | return (0); | |
941 | } | |
942 | # else | |
943 | if (!utmp_write_direct(li, &ut)) { | |
944 | logit("%s: utmp_write_direct() failed", __func__); | |
945 | return (0); | |
946 | } | |
947 | # endif | |
948 | return (1); | |
949 | } | |
950 | ||
951 | ||
952 | int | |
953 | utmp_write_entry(struct logininfo *li) | |
954 | { | |
955 | switch(li->type) { | |
956 | case LTYPE_LOGIN: | |
957 | return (utmp_perform_login(li)); | |
958 | ||
959 | case LTYPE_LOGOUT: | |
960 | return (utmp_perform_logout(li)); | |
961 | ||
962 | default: | |
963 | logit("%s: invalid type field", __func__); | |
964 | return (0); | |
965 | } | |
966 | } | |
967 | #endif /* USE_UTMP */ | |
968 | ||
969 | ||
970 | /** | |
971 | ** Low-level utmpx functions | |
972 | **/ | |
973 | ||
974 | /* not much point if we don't want utmpx entries */ | |
975 | #ifdef USE_UTMPX | |
976 | ||
977 | /* if we have the wherewithall, use pututxline etc. */ | |
978 | # if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \ | |
979 | defined(HAVE_PUTUTXLINE) | |
980 | # define UTMPX_USE_LIBRARY | |
981 | # endif | |
982 | ||
983 | ||
984 | /* write a utmpx entry with the system's help (pututxline() and pals) */ | |
985 | # ifdef UTMPX_USE_LIBRARY | |
986 | static int | |
987 | utmpx_write_library(struct logininfo *li, struct utmpx *utx) | |
988 | { | |
989 | setutxent(); | |
990 | pututxline(utx); | |
991 | ||
992 | # ifdef HAVE_ENDUTXENT | |
993 | endutxent(); | |
994 | # endif | |
995 | return (1); | |
996 | } | |
997 | ||
998 | # else /* UTMPX_USE_LIBRARY */ | |
999 | ||
1000 | /* write a utmp entry direct to the file */ | |
1001 | static int | |
1002 | utmpx_write_direct(struct logininfo *li, struct utmpx *utx) | |
1003 | { | |
1004 | logit("%s: not implemented!", __func__); | |
1005 | return (0); | |
1006 | } | |
1007 | # endif /* UTMPX_USE_LIBRARY */ | |
1008 | ||
1009 | static int | |
1010 | utmpx_perform_login(struct logininfo *li) | |
1011 | { | |
1012 | struct utmpx utx; | |
1013 | ||
1014 | construct_utmpx(li, &utx); | |
1015 | # ifdef UTMPX_USE_LIBRARY | |
1016 | if (!utmpx_write_library(li, &utx)) { | |
1017 | logit("%s: utmp_write_library() failed", __func__); | |
1018 | return (0); | |
1019 | } | |
1020 | # else | |
1021 | if (!utmpx_write_direct(li, &ut)) { | |
1022 | logit("%s: utmp_write_direct() failed", __func__); | |
1023 | return (0); | |
1024 | } | |
1025 | # endif | |
1026 | return (1); | |
1027 | } | |
1028 | ||
1029 | ||
1030 | static int | |
1031 | utmpx_perform_logout(struct logininfo *li) | |
1032 | { | |
1033 | struct utmpx utx; | |
1034 | ||
1035 | construct_utmpx(li, &utx); | |
1036 | # ifdef HAVE_ID_IN_UTMPX | |
1037 | line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id)); | |
1038 | # endif | |
1039 | # ifdef HAVE_TYPE_IN_UTMPX | |
1040 | utx.ut_type = DEAD_PROCESS; | |
1041 | # endif | |
1042 | ||
1043 | # ifdef UTMPX_USE_LIBRARY | |
1044 | utmpx_write_library(li, &utx); | |
1045 | # else | |
1046 | utmpx_write_direct(li, &utx); | |
1047 | # endif | |
1048 | return (1); | |
1049 | } | |
1050 | ||
1051 | int | |
1052 | utmpx_write_entry(struct logininfo *li) | |
1053 | { | |
1054 | switch(li->type) { | |
1055 | case LTYPE_LOGIN: | |
1056 | return (utmpx_perform_login(li)); | |
1057 | case LTYPE_LOGOUT: | |
1058 | return (utmpx_perform_logout(li)); | |
1059 | default: | |
1060 | logit("%s: invalid type field", __func__); | |
1061 | return (0); | |
1062 | } | |
1063 | } | |
1064 | #endif /* USE_UTMPX */ | |
1065 | ||
1066 | ||
1067 | /** | |
1068 | ** Low-level wtmp functions | |
1069 | **/ | |
1070 | ||
1071 | #ifdef USE_WTMP | |
1072 | ||
1073 | /* | |
1074 | * Write a wtmp entry direct to the end of the file | |
1075 | * This is a slight modification of code in OpenBSD's logwtmp.c | |
1076 | */ | |
1077 | static int | |
1078 | wtmp_write(struct logininfo *li, struct utmp *ut) | |
1079 | { | |
1080 | struct stat buf; | |
1081 | int fd, ret = 1; | |
1082 | ||
1083 | if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
1084 | logit("%s: problem writing %s: %s", __func__, | |
1085 | WTMP_FILE, strerror(errno)); | |
1086 | return (0); | |
1087 | } | |
1088 | if (fstat(fd, &buf) == 0) | |
1089 | if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) { | |
1090 | ftruncate(fd, buf.st_size); | |
1091 | logit("%s: problem writing %s: %s", __func__, | |
1092 | WTMP_FILE, strerror(errno)); | |
1093 | ret = 0; | |
1094 | } | |
1095 | close(fd); | |
1096 | return (ret); | |
1097 | } | |
1098 | ||
1099 | static int | |
1100 | wtmp_perform_login(struct logininfo *li) | |
1101 | { | |
1102 | struct utmp ut; | |
1103 | ||
1104 | construct_utmp(li, &ut); | |
1105 | return (wtmp_write(li, &ut)); | |
1106 | } | |
1107 | ||
1108 | ||
1109 | static int | |
1110 | wtmp_perform_logout(struct logininfo *li) | |
1111 | { | |
1112 | struct utmp ut; | |
1113 | ||
1114 | construct_utmp(li, &ut); | |
1115 | return (wtmp_write(li, &ut)); | |
1116 | } | |
1117 | ||
1118 | ||
1119 | int | |
1120 | wtmp_write_entry(struct logininfo *li) | |
1121 | { | |
1122 | switch(li->type) { | |
1123 | case LTYPE_LOGIN: | |
1124 | return (wtmp_perform_login(li)); | |
1125 | case LTYPE_LOGOUT: | |
1126 | return (wtmp_perform_logout(li)); | |
1127 | default: | |
1128 | logit("%s: invalid type field", __func__); | |
1129 | return (0); | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | ||
1134 | /* | |
1135 | * Notes on fetching login data from wtmp/wtmpx | |
1136 | * | |
1137 | * Logouts are usually recorded with (amongst other things) a blank | |
1138 | * username on a given tty line. However, some systems (HP-UX is one) | |
1139 | * leave all fields set, but change the ut_type field to DEAD_PROCESS. | |
1140 | * | |
1141 | * Since we're only looking for logins here, we know that the username | |
1142 | * must be set correctly. On systems that leave it in, we check for | |
1143 | * ut_type==USER_PROCESS (indicating a login.) | |
1144 | * | |
1145 | * Portability: Some systems may set something other than USER_PROCESS | |
1146 | * to indicate a login process. I don't know of any as I write. Also, | |
1147 | * it's possible that some systems may both leave the username in | |
1148 | * place and not have ut_type. | |
1149 | */ | |
1150 | ||
1151 | /* return true if this wtmp entry indicates a login */ | |
1152 | static int | |
1153 | wtmp_islogin(struct logininfo *li, struct utmp *ut) | |
1154 | { | |
1155 | if (strncmp(li->username, ut->ut_name, | |
1156 | MIN_SIZEOF(li->username, ut->ut_name)) == 0) { | |
1157 | # ifdef HAVE_TYPE_IN_UTMP | |
1158 | if (ut->ut_type & USER_PROCESS) | |
1159 | return (1); | |
1160 | # else | |
1161 | return (1); | |
1162 | # endif | |
1163 | } | |
1164 | return (0); | |
1165 | } | |
1166 | ||
1167 | int | |
1168 | wtmp_get_entry(struct logininfo *li) | |
1169 | { | |
1170 | struct stat st; | |
1171 | struct utmp ut; | |
1172 | int fd, found = 0; | |
1173 | ||
1174 | /* Clear the time entries in our logininfo */ | |
1175 | li->tv_sec = li->tv_usec = 0; | |
1176 | ||
1177 | if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) { | |
1178 | logit("%s: problem opening %s: %s", __func__, | |
1179 | WTMP_FILE, strerror(errno)); | |
1180 | return (0); | |
1181 | } | |
1182 | if (fstat(fd, &st) != 0) { | |
1183 | logit("%s: couldn't stat %s: %s", __func__, | |
1184 | WTMP_FILE, strerror(errno)); | |
1185 | close(fd); | |
1186 | return (0); | |
1187 | } | |
1188 | ||
1189 | /* Seek to the start of the last struct utmp */ | |
1190 | if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) { | |
1191 | /* Looks like we've got a fresh wtmp file */ | |
1192 | close(fd); | |
1193 | return (0); | |
1194 | } | |
1195 | ||
1196 | while (!found) { | |
1197 | if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) { | |
1198 | logit("%s: read of %s failed: %s", __func__, | |
1199 | WTMP_FILE, strerror(errno)); | |
1200 | close (fd); | |
1201 | return (0); | |
1202 | } | |
1203 | if ( wtmp_islogin(li, &ut) ) { | |
1204 | found = 1; | |
1205 | /* | |
1206 | * We've already checked for a time in struct | |
1207 | * utmp, in login_getlast() | |
1208 | */ | |
1209 | # ifdef HAVE_TIME_IN_UTMP | |
1210 | li->tv_sec = ut.ut_time; | |
1211 | # else | |
1212 | # if HAVE_TV_IN_UTMP | |
1213 | li->tv_sec = ut.ut_tv.tv_sec; | |
1214 | # endif | |
1215 | # endif | |
1216 | line_fullname(li->line, ut.ut_line, | |
1217 | MIN_SIZEOF(li->line, ut.ut_line)); | |
1218 | # ifdef HAVE_HOST_IN_UTMP | |
1219 | strlcpy(li->hostname, ut.ut_host, | |
1220 | MIN_SIZEOF(li->hostname, ut.ut_host)); | |
1221 | # endif | |
1222 | continue; | |
1223 | } | |
1224 | /* Seek back 2 x struct utmp */ | |
1225 | if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) { | |
1226 | /* We've found the start of the file, so quit */ | |
1227 | close(fd); | |
1228 | return (0); | |
1229 | } | |
1230 | } | |
1231 | ||
1232 | /* We found an entry. Tidy up and return */ | |
1233 | close(fd); | |
1234 | return (1); | |
1235 | } | |
1236 | # endif /* USE_WTMP */ | |
1237 | ||
1238 | ||
1239 | /** | |
1240 | ** Low-level wtmpx functions | |
1241 | **/ | |
1242 | ||
1243 | #ifdef USE_WTMPX | |
1244 | /* | |
1245 | * Write a wtmpx entry direct to the end of the file | |
1246 | * This is a slight modification of code in OpenBSD's logwtmp.c | |
1247 | */ | |
1248 | static int | |
1249 | wtmpx_write(struct logininfo *li, struct utmpx *utx) | |
1250 | { | |
1251 | #ifndef HAVE_UPDWTMPX | |
1252 | struct stat buf; | |
1253 | int fd, ret = 1; | |
1254 | ||
1255 | if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
1256 | logit("%s: problem opening %s: %s", __func__, | |
1257 | WTMPX_FILE, strerror(errno)); | |
1258 | return (0); | |
1259 | } | |
1260 | ||
1261 | if (fstat(fd, &buf) == 0) | |
1262 | if (atomicio(vwrite, fd, utx, sizeof(*utx)) != sizeof(*utx)) { | |
1263 | ftruncate(fd, buf.st_size); | |
1264 | logit("%s: problem writing %s: %s", __func__, | |
1265 | WTMPX_FILE, strerror(errno)); | |
1266 | ret = 0; | |
1267 | } | |
1268 | close(fd); | |
1269 | ||
1270 | return (ret); | |
1271 | #else | |
1272 | updwtmpx(WTMPX_FILE, utx); | |
1273 | return (1); | |
1274 | #endif | |
1275 | } | |
1276 | ||
1277 | ||
1278 | static int | |
1279 | wtmpx_perform_login(struct logininfo *li) | |
1280 | { | |
1281 | struct utmpx utx; | |
1282 | ||
1283 | construct_utmpx(li, &utx); | |
1284 | return (wtmpx_write(li, &utx)); | |
1285 | } | |
1286 | ||
1287 | ||
1288 | static int | |
1289 | wtmpx_perform_logout(struct logininfo *li) | |
1290 | { | |
1291 | struct utmpx utx; | |
1292 | ||
1293 | construct_utmpx(li, &utx); | |
1294 | return (wtmpx_write(li, &utx)); | |
1295 | } | |
1296 | ||
1297 | ||
1298 | int | |
1299 | wtmpx_write_entry(struct logininfo *li) | |
1300 | { | |
1301 | switch(li->type) { | |
1302 | case LTYPE_LOGIN: | |
1303 | return (wtmpx_perform_login(li)); | |
1304 | case LTYPE_LOGOUT: | |
1305 | return (wtmpx_perform_logout(li)); | |
1306 | default: | |
1307 | logit("%s: invalid type field", __func__); | |
1308 | return (0); | |
1309 | } | |
1310 | } | |
1311 | ||
1312 | /* Please see the notes above wtmp_islogin() for information about the | |
1313 | next two functions */ | |
1314 | ||
1315 | /* Return true if this wtmpx entry indicates a login */ | |
1316 | static int | |
1317 | wtmpx_islogin(struct logininfo *li, struct utmpx *utx) | |
1318 | { | |
1319 | if (strncmp(li->username, utx->ut_user, | |
1320 | MIN_SIZEOF(li->username, utx->ut_user)) == 0 ) { | |
1321 | # ifdef HAVE_TYPE_IN_UTMPX | |
1322 | if (utx->ut_type == USER_PROCESS) | |
1323 | return (1); | |
1324 | # else | |
1325 | return (1); | |
1326 | # endif | |
1327 | } | |
1328 | return (0); | |
1329 | } | |
1330 | ||
1331 | ||
1332 | int | |
1333 | wtmpx_get_entry(struct logininfo *li) | |
1334 | { | |
1335 | struct stat st; | |
1336 | struct utmpx utx; | |
1337 | int fd, found=0; | |
1338 | ||
1339 | /* Clear the time entries */ | |
1340 | li->tv_sec = li->tv_usec = 0; | |
1341 | ||
1342 | if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) { | |
1343 | logit("%s: problem opening %s: %s", __func__, | |
1344 | WTMPX_FILE, strerror(errno)); | |
1345 | return (0); | |
1346 | } | |
1347 | if (fstat(fd, &st) != 0) { | |
1348 | logit("%s: couldn't stat %s: %s", __func__, | |
1349 | WTMPX_FILE, strerror(errno)); | |
1350 | close(fd); | |
1351 | return (0); | |
1352 | } | |
1353 | ||
1354 | /* Seek to the start of the last struct utmpx */ | |
1355 | if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) { | |
1356 | /* probably a newly rotated wtmpx file */ | |
1357 | close(fd); | |
1358 | return (0); | |
1359 | } | |
1360 | ||
1361 | while (!found) { | |
1362 | if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) { | |
1363 | logit("%s: read of %s failed: %s", __func__, | |
1364 | WTMPX_FILE, strerror(errno)); | |
1365 | close (fd); | |
1366 | return (0); | |
1367 | } | |
1368 | /* | |
1369 | * Logouts are recorded as a blank username on a particular | |
1370 | * line. So, we just need to find the username in struct utmpx | |
1371 | */ | |
1372 | if (wtmpx_islogin(li, &utx)) { | |
1373 | found = 1; | |
1374 | # if defined(HAVE_TV_IN_UTMPX) | |
1375 | li->tv_sec = utx.ut_tv.tv_sec; | |
1376 | # elif defined(HAVE_TIME_IN_UTMPX) | |
1377 | li->tv_sec = utx.ut_time; | |
1378 | # endif | |
1379 | line_fullname(li->line, utx.ut_line, sizeof(li->line)); | |
1380 | # if defined(HAVE_HOST_IN_UTMPX) | |
1381 | strlcpy(li->hostname, utx.ut_host, | |
1382 | MIN_SIZEOF(li->hostname, utx.ut_host)); | |
1383 | # endif | |
1384 | continue; | |
1385 | } | |
1386 | if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) { | |
1387 | close(fd); | |
1388 | return (0); | |
1389 | } | |
1390 | } | |
1391 | ||
1392 | close(fd); | |
1393 | return (1); | |
1394 | } | |
1395 | #endif /* USE_WTMPX */ | |
1396 | ||
1397 | /** | |
1398 | ** Low-level libutil login() functions | |
1399 | **/ | |
1400 | ||
1401 | #ifdef USE_LOGIN | |
1402 | static int | |
1403 | syslogin_perform_login(struct logininfo *li) | |
1404 | { | |
1405 | struct utmp *ut; | |
1406 | ||
1407 | ut = xmalloc(sizeof(*ut)); | |
1408 | construct_utmp(li, ut); | |
1409 | login(ut); | |
1410 | free(ut); | |
1411 | ||
1412 | return (1); | |
1413 | } | |
1414 | ||
1415 | static int | |
1416 | syslogin_perform_logout(struct logininfo *li) | |
1417 | { | |
1418 | # ifdef HAVE_LOGOUT | |
1419 | char line[UT_LINESIZE]; | |
1420 | ||
1421 | (void)line_stripname(line, li->line, sizeof(line)); | |
1422 | ||
1423 | if (!logout(line)) | |
1424 | logit("%s: logout() returned an error", __func__); | |
1425 | # ifdef HAVE_LOGWTMP | |
1426 | else | |
1427 | logwtmp(line, "", ""); | |
1428 | # endif | |
1429 | /* FIXME: (ATL - if the need arises) What to do if we have | |
1430 | * login, but no logout? what if logout but no logwtmp? All | |
1431 | * routines are in libutil so they should all be there, | |
1432 | * but... */ | |
1433 | # endif | |
1434 | return (1); | |
1435 | } | |
1436 | ||
1437 | int | |
1438 | syslogin_write_entry(struct logininfo *li) | |
1439 | { | |
1440 | switch (li->type) { | |
1441 | case LTYPE_LOGIN: | |
1442 | return (syslogin_perform_login(li)); | |
1443 | case LTYPE_LOGOUT: | |
1444 | return (syslogin_perform_logout(li)); | |
1445 | default: | |
1446 | logit("%s: Invalid type field", __func__); | |
1447 | return (0); | |
1448 | } | |
1449 | } | |
1450 | #endif /* USE_LOGIN */ | |
1451 | ||
1452 | /* end of file log-syslogin.c */ | |
1453 | ||
1454 | /** | |
1455 | ** Low-level lastlog functions | |
1456 | **/ | |
1457 | ||
1458 | #ifdef USE_LASTLOG | |
1459 | ||
1460 | #if !defined(LASTLOG_WRITE_PUTUTXLINE) || !defined(HAVE_GETLASTLOGXBYNAME) | |
1461 | /* open the file (using filemode) and seek to the login entry */ | |
1462 | static int | |
1463 | lastlog_openseek(struct logininfo *li, int *fd, int filemode) | |
1464 | { | |
1465 | off_t offset; | |
1466 | char lastlog_file[1024]; | |
1467 | struct stat st; | |
1468 | ||
1469 | if (stat(LASTLOG_FILE, &st) != 0) { | |
1470 | logit("%s: Couldn't stat %s: %s", __func__, | |
1471 | LASTLOG_FILE, strerror(errno)); | |
1472 | return (0); | |
1473 | } | |
1474 | if (S_ISDIR(st.st_mode)) { | |
1475 | snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s", | |
1476 | LASTLOG_FILE, li->username); | |
1477 | } else if (S_ISREG(st.st_mode)) { | |
1478 | strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file)); | |
1479 | } else { | |
1480 | logit("%s: %.100s is not a file or directory!", __func__, | |
1481 | LASTLOG_FILE); | |
1482 | return (0); | |
1483 | } | |
1484 | ||
1485 | *fd = open(lastlog_file, filemode, 0600); | |
1486 | if (*fd < 0) { | |
1487 | debug("%s: Couldn't open %s: %s", __func__, | |
1488 | lastlog_file, strerror(errno)); | |
1489 | return (0); | |
1490 | } | |
1491 | ||
1492 | if (S_ISREG(st.st_mode)) { | |
1493 | /* find this uid's offset in the lastlog file */ | |
1494 | offset = (off_t) ((long)li->uid * sizeof(struct lastlog)); | |
1495 | ||
1496 | if (lseek(*fd, offset, SEEK_SET) != offset) { | |
1497 | logit("%s: %s->lseek(): %s", __func__, | |
1498 | lastlog_file, strerror(errno)); | |
1499 | return (0); | |
1500 | } | |
1501 | } | |
1502 | ||
1503 | return (1); | |
1504 | } | |
1505 | #endif /* !LASTLOG_WRITE_PUTUTXLINE || !HAVE_GETLASTLOGXBYNAME */ | |
1506 | ||
1507 | #ifdef LASTLOG_WRITE_PUTUTXLINE | |
1508 | int | |
1509 | lastlog_write_entry(struct logininfo *li) | |
1510 | { | |
1511 | switch(li->type) { | |
1512 | case LTYPE_LOGIN: | |
1513 | return 1; /* lastlog written by pututxline */ | |
1514 | default: | |
1515 | logit("lastlog_write_entry: Invalid type field"); | |
1516 | return 0; | |
1517 | } | |
1518 | } | |
1519 | #else /* LASTLOG_WRITE_PUTUTXLINE */ | |
1520 | int | |
1521 | lastlog_write_entry(struct logininfo *li) | |
1522 | { | |
1523 | struct lastlog last; | |
1524 | int fd; | |
1525 | ||
1526 | switch(li->type) { | |
1527 | case LTYPE_LOGIN: | |
1528 | /* create our struct lastlog */ | |
1529 | memset(&last, '\0', sizeof(last)); | |
1530 | line_stripname(last.ll_line, li->line, sizeof(last.ll_line)); | |
1531 | strlcpy(last.ll_host, li->hostname, | |
1532 | MIN_SIZEOF(last.ll_host, li->hostname)); | |
1533 | last.ll_time = li->tv_sec; | |
1534 | ||
1535 | if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT)) | |
1536 | return (0); | |
1537 | ||
1538 | /* write the entry */ | |
1539 | if (atomicio(vwrite, fd, &last, sizeof(last)) != sizeof(last)) { | |
1540 | close(fd); | |
1541 | logit("%s: Error writing to %s: %s", __func__, | |
1542 | LASTLOG_FILE, strerror(errno)); | |
1543 | return (0); | |
1544 | } | |
1545 | ||
1546 | close(fd); | |
1547 | return (1); | |
1548 | default: | |
1549 | logit("%s: Invalid type field", __func__); | |
1550 | return (0); | |
1551 | } | |
1552 | } | |
1553 | #endif /* LASTLOG_WRITE_PUTUTXLINE */ | |
1554 | ||
1555 | #ifdef HAVE_GETLASTLOGXBYNAME | |
1556 | int | |
1557 | lastlog_get_entry(struct logininfo *li) | |
1558 | { | |
1559 | struct lastlogx l, *ll; | |
1560 | ||
1561 | if ((ll = getlastlogxbyname(li->username, &l)) == NULL) { | |
1562 | memset(&l, '\0', sizeof(l)); | |
1563 | ll = &l; | |
1564 | } | |
1565 | line_fullname(li->line, ll->ll_line, sizeof(li->line)); | |
1566 | strlcpy(li->hostname, ll->ll_host, | |
1567 | MIN_SIZEOF(li->hostname, ll->ll_host)); | |
1568 | li->tv_sec = ll->ll_tv.tv_sec; | |
1569 | li->tv_usec = ll->ll_tv.tv_usec; | |
1570 | return (1); | |
1571 | } | |
1572 | #else /* HAVE_GETLASTLOGXBYNAME */ | |
1573 | int | |
1574 | lastlog_get_entry(struct logininfo *li) | |
1575 | { | |
1576 | struct lastlog last; | |
1577 | int fd, ret; | |
1578 | ||
1579 | if (!lastlog_openseek(li, &fd, O_RDONLY)) | |
1580 | return (0); | |
1581 | ||
1582 | ret = atomicio(read, fd, &last, sizeof(last)); | |
1583 | close(fd); | |
1584 | ||
1585 | switch (ret) { | |
1586 | case 0: | |
1587 | memset(&last, '\0', sizeof(last)); | |
1588 | /* FALLTHRU */ | |
1589 | case sizeof(last): | |
1590 | line_fullname(li->line, last.ll_line, sizeof(li->line)); | |
1591 | strlcpy(li->hostname, last.ll_host, | |
1592 | MIN_SIZEOF(li->hostname, last.ll_host)); | |
1593 | li->tv_sec = last.ll_time; | |
1594 | return (1); | |
1595 | case -1: | |
1596 | error("%s: Error reading from %s: %s", __func__, | |
1597 | LASTLOG_FILE, strerror(errno)); | |
1598 | return (0); | |
1599 | default: | |
1600 | error("%s: Error reading from %s: Expecting %d, got %d", | |
1601 | __func__, LASTLOG_FILE, (int)sizeof(last), ret); | |
1602 | return (0); | |
1603 | } | |
1604 | ||
1605 | /* NOTREACHED */ | |
1606 | return (0); | |
1607 | } | |
1608 | #endif /* HAVE_GETLASTLOGXBYNAME */ | |
1609 | #endif /* USE_LASTLOG */ | |
1610 | ||
1611 | #ifdef USE_BTMP | |
1612 | /* | |
1613 | * Logs failed login attempts in _PATH_BTMP if that exists. | |
1614 | * The most common login failure is to give password instead of username. | |
1615 | * So the _PATH_BTMP file checked for the correct permission, so that | |
1616 | * only root can read it. | |
1617 | */ | |
1618 | ||
1619 | void | |
1620 | record_failed_login(const char *username, const char *hostname, | |
1621 | const char *ttyn) | |
1622 | { | |
1623 | int fd; | |
1624 | struct utmp ut; | |
1625 | struct sockaddr_storage from; | |
1626 | socklen_t fromlen = sizeof(from); | |
1627 | struct sockaddr_in *a4; | |
1628 | struct sockaddr_in6 *a6; | |
1629 | time_t t; | |
1630 | struct stat fst; | |
1631 | ||
1632 | if (geteuid() != 0) | |
1633 | return; | |
1634 | if ((fd = open(_PATH_BTMP, O_WRONLY | O_APPEND)) < 0) { | |
1635 | debug("Unable to open the btmp file %s: %s", _PATH_BTMP, | |
1636 | strerror(errno)); | |
1637 | return; | |
1638 | } | |
1639 | if (fstat(fd, &fst) < 0) { | |
1640 | logit("%s: fstat of %s failed: %s", __func__, _PATH_BTMP, | |
1641 | strerror(errno)); | |
1642 | goto out; | |
1643 | } | |
1644 | if((fst.st_mode & (S_IRWXG | S_IRWXO)) || (fst.st_uid != 0)){ | |
1645 | logit("Excess permission or bad ownership on file %s", | |
1646 | _PATH_BTMP); | |
1647 | goto out; | |
1648 | } | |
1649 | ||
1650 | memset(&ut, 0, sizeof(ut)); | |
1651 | /* strncpy because we don't necessarily want nul termination */ | |
1652 | strncpy(ut.ut_user, username, sizeof(ut.ut_user)); | |
1653 | strlcpy(ut.ut_line, "ssh:notty", sizeof(ut.ut_line)); | |
1654 | ||
1655 | time(&t); | |
1656 | ut.ut_time = t; /* ut_time is not always a time_t */ | |
1657 | ut.ut_type = LOGIN_PROCESS; | |
1658 | ut.ut_pid = getpid(); | |
1659 | ||
1660 | /* strncpy because we don't necessarily want nul termination */ | |
1661 | strncpy(ut.ut_host, hostname, sizeof(ut.ut_host)); | |
1662 | ||
1663 | if (packet_connection_is_on_socket() && | |
1664 | getpeername(packet_get_connection_in(), | |
1665 | (struct sockaddr *)&from, &fromlen) == 0) { | |
1666 | ipv64_normalise_mapped(&from, &fromlen); | |
1667 | if (from.ss_family == AF_INET) { | |
1668 | a4 = (struct sockaddr_in *)&from; | |
1669 | memcpy(&ut.ut_addr, &(a4->sin_addr), | |
1670 | MIN_SIZEOF(ut.ut_addr, a4->sin_addr)); | |
1671 | } | |
1672 | #ifdef HAVE_ADDR_V6_IN_UTMP | |
1673 | if (from.ss_family == AF_INET6) { | |
1674 | a6 = (struct sockaddr_in6 *)&from; | |
1675 | memcpy(&ut.ut_addr_v6, &(a6->sin6_addr), | |
1676 | MIN_SIZEOF(ut.ut_addr_v6, a6->sin6_addr)); | |
1677 | } | |
1678 | #endif | |
1679 | } | |
1680 | ||
1681 | if (atomicio(vwrite, fd, &ut, sizeof(ut)) != sizeof(ut)) | |
1682 | error("Failed to write to %s: %s", _PATH_BTMP, | |
1683 | strerror(errno)); | |
1684 | ||
1685 | out: | |
1686 | close(fd); | |
1687 | } | |
1688 | #endif /* USE_BTMP */ |