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3c0ef626 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.
3c0ef626 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
996d5e62 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
3c0ef626 49/**
50 ** loginrec.c: platform-independent login recording and lastlog retrieval
51 **/
52
53/*
996d5e62 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 */
3c0ef626 147
148#include "includes.h"
149
150#include "ssh.h"
151#include "xmalloc.h"
152#include "loginrec.h"
153#include "log.h"
154#include "atomicio.h"
996d5e62 155#include "packet.h"
156#include "canohost.h"
157#include "auth.h"
158#include "buffer.h"
3c0ef626 159
160#ifdef HAVE_UTIL_H
996d5e62 161# include <util.h>
3c0ef626 162#endif
163
164#ifdef HAVE_LIBUTIL_H
996d5e62 165# include <libutil.h>
3c0ef626 166#endif
167
996d5e62 168RCSID("$Id$");
169
3c0ef626 170/**
171 ** prototypes for helper functions in this file
172 **/
173
174#if HAVE_UTMP_H
175void set_utmp_time(struct logininfo *li, struct utmp *ut);
176void construct_utmp(struct logininfo *li, struct utmp *ut);
177#endif
178
179#ifdef HAVE_UTMPX_H
180void set_utmpx_time(struct logininfo *li, struct utmpx *ut);
181void construct_utmpx(struct logininfo *li, struct utmpx *ut);
182#endif
183
184int utmp_write_entry(struct logininfo *li);
185int utmpx_write_entry(struct logininfo *li);
186int wtmp_write_entry(struct logininfo *li);
187int wtmpx_write_entry(struct logininfo *li);
188int lastlog_write_entry(struct logininfo *li);
189int syslogin_write_entry(struct logininfo *li);
190
191int getlast_entry(struct logininfo *li);
192int lastlog_get_entry(struct logininfo *li);
193int wtmp_get_entry(struct logininfo *li);
194int wtmpx_get_entry(struct logininfo *li);
195
996d5e62 196extern Buffer loginmsg;
197
3c0ef626 198/* pick the shortest string */
996d5e62 199#define MIN_SIZEOF(s1,s2) (sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2))
3c0ef626 200
201/**
202 ** platform-independent login functions
203 **/
204
996d5e62 205/*
206 * login_login(struct logininfo *) - Record a login
3c0ef626 207 *
208 * Call with a pointer to a struct logininfo initialised with
209 * login_init_entry() or login_alloc_entry()
210 *
211 * Returns:
212 * >0 if successful
213 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
214 */
215int
996d5e62 216login_login(struct logininfo *li)
3c0ef626 217{
218 li->type = LTYPE_LOGIN;
996d5e62 219 return (login_write(li));
3c0ef626 220}
221
222
996d5e62 223/*
224 * login_logout(struct logininfo *) - Record a logout
3c0ef626 225 *
226 * Call as with login_login()
227 *
228 * Returns:
229 * >0 if successful
230 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
231 */
232int
233login_logout(struct logininfo *li)
234{
235 li->type = LTYPE_LOGOUT;
996d5e62 236 return (login_write(li));
3c0ef626 237}
238
996d5e62 239/*
240 * login_get_lastlog_time(int) - Retrieve the last login time
3c0ef626 241 *
242 * Retrieve the last login time for the given uid. Will try to use the
243 * system lastlog facilities if they are available, but will fall back
244 * to looking in wtmp/wtmpx if necessary
245 *
246 * Returns:
247 * 0 on failure, or if user has never logged in
248 * Time in seconds from the epoch if successful
249 *
250 * Useful preprocessor symbols:
251 * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog
252 * info
253 * USE_LASTLOG: If set, indicates the presence of system lastlog
254 * facilities. If this and DISABLE_LASTLOG are not set,
255 * try to retrieve lastlog information from wtmp/wtmpx.
256 */
257unsigned int
258login_get_lastlog_time(const int uid)
259{
260 struct logininfo li;
261
262 if (login_get_lastlog(&li, uid))
996d5e62 263 return (li.tv_sec);
3c0ef626 264 else
996d5e62 265 return (0);
3c0ef626 266}
267
996d5e62 268/*
269 * login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry
3c0ef626 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)
3c0ef626 280 */
281struct logininfo *
282login_get_lastlog(struct logininfo *li, const int uid)
283{
284 struct passwd *pw;
285
286 memset(li, '\0', sizeof(*li));
287 li->uid = uid;
288
289 /*
290 * If we don't have a 'real' lastlog, we need the username to
291 * reliably search wtmp(x) for the last login (see
292 * wtmp_get_entry().)
293 */
294 pw = getpwuid(uid);
295 if (pw == NULL)
996d5e62 296 fatal("%s: Cannot find account for uid %i", __func__, uid);
3c0ef626 297
298 /* No MIN_SIZEOF here - we absolutely *must not* truncate the
996d5e62 299 * username (XXX - so check for trunc!) */
3c0ef626 300 strlcpy(li->username, pw->pw_name, sizeof(li->username));
301
302 if (getlast_entry(li))
996d5e62 303 return (li);
3c0ef626 304 else
996d5e62 305 return (NULL);
3c0ef626 306}
307
308
996d5e62 309/*
310 * login_alloc_entry(int, char*, char*, char*) - Allocate and initialise
3c0ef626 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 */
319struct
320logininfo *login_alloc_entry(int pid, const char *username,
996d5e62 321 const char *hostname, const char *line)
3c0ef626 322{
323 struct logininfo *newli;
324
996d5e62 325 newli = xmalloc(sizeof(*newli));
326 login_init_entry(newli, pid, username, hostname, line);
327 return (newli);
3c0ef626 328}
329
330
331/* login_free_entry(struct logininfo *) - free struct memory */
332void
333login_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 */
347int
348login_init_entry(struct logininfo *li, int pid, const char *username,
996d5e62 349 const char *hostname, const char *line)
3c0ef626 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);
996d5e62 364 if (pw == NULL) {
665a873d 365 fatal("%s: Cannot find user \"%s\"", __func__,
996d5e62 366 li->username);
367 }
3c0ef626 368 li->uid = pw->pw_uid;
369 }
370
371 if (hostname)
372 strlcpy(li->hostname, hostname, sizeof(li->hostname));
373
996d5e62 374 return (1);
3c0ef626 375}
376
665a873d 377/*
996d5e62 378 * login_set_current_time(struct logininfo *) - set the current time
3c0ef626 379 *
380 * Set the current time in a logininfo structure. This function is
381 * meant to eliminate the need to deal with system dependencies for
382 * time handling.
383 */
384void
385login_set_current_time(struct logininfo *li)
386{
387 struct timeval tv;
388
389 gettimeofday(&tv, NULL);
390
391 li->tv_sec = tv.tv_sec;
392 li->tv_usec = tv.tv_usec;
393}
394
395/* copy a sockaddr_* into our logininfo */
396void
397login_set_addr(struct logininfo *li, const struct sockaddr *sa,
996d5e62 398 const unsigned int sa_size)
3c0ef626 399{
400 unsigned int bufsize = sa_size;
401
402 /* make sure we don't overrun our union */
403 if (sizeof(li->hostaddr) < sa_size)
404 bufsize = sizeof(li->hostaddr);
405
996d5e62 406 memcpy(&li->hostaddr.sa, sa, bufsize);
3c0ef626 407}
408
409
410/**
411 ** login_write: Call low-level recording functions based on autoconf
412 ** results
413 **/
414int
996d5e62 415login_write(struct logininfo *li)
3c0ef626 416{
417#ifndef HAVE_CYGWIN
996d5e62 418 if (geteuid() != 0) {
419 logit("Attempt to write login records by non-root user (aborting)");
420 return (1);
3c0ef626 421 }
422#endif
423
424 /* set the timestamp */
425 login_set_current_time(li);
426#ifdef USE_LOGIN
427 syslogin_write_entry(li);
428#endif
429#ifdef USE_LASTLOG
996d5e62 430 if (li->type == LTYPE_LOGIN)
3c0ef626 431 lastlog_write_entry(li);
3c0ef626 432#endif
433#ifdef USE_UTMP
434 utmp_write_entry(li);
435#endif
436#ifdef USE_WTMP
437 wtmp_write_entry(li);
438#endif
439#ifdef USE_UTMPX
440 utmpx_write_entry(li);
441#endif
442#ifdef USE_WTMPX
443 wtmpx_write_entry(li);
c9f39d2c 444#endif
445#ifdef CUSTOM_SYS_AUTH_RECORD_LOGIN
665a873d 446 if (li->type == LTYPE_LOGIN &&
447 !sys_auth_record_login(li->username,li->hostname,li->line,
448 &loginmsg))
c9f39d2c 449 logit("Writing login record failed for %s", li->username);
3c0ef626 450#endif
996d5e62 451#ifdef SSH_AUDIT_EVENTS
452 if (li->type == LTYPE_LOGIN)
453 audit_session_open(li->line);
454 else if (li->type == LTYPE_LOGOUT)
455 audit_session_close(li->line);
456#endif
457 return (0);
3c0ef626 458}
459
460#ifdef LOGIN_NEEDS_UTMPX
461int
462login_utmp_only(struct logininfo *li)
463{
cdd66111 464 li->type = LTYPE_LOGIN;
3c0ef626 465 login_set_current_time(li);
466# ifdef USE_UTMP
467 utmp_write_entry(li);
468# endif
469# ifdef USE_WTMP
470 wtmp_write_entry(li);
471# endif
472# ifdef USE_UTMPX
473 utmpx_write_entry(li);
474# endif
475# ifdef USE_WTMPX
476 wtmpx_write_entry(li);
477# endif
996d5e62 478 return (0);
3c0ef626 479}
480#endif
481
482/**
483 ** getlast_entry: Call low-level functions to retrieve the last login
484 ** time.
485 **/
486
487/* take the uid in li and return the last login time */
488int
489getlast_entry(struct logininfo *li)
490{
491#ifdef USE_LASTLOG
492 return(lastlog_get_entry(li));
493#else /* !USE_LASTLOG */
494
996d5e62 495#if defined(DISABLE_LASTLOG)
3c0ef626 496 /* On some systems we shouldn't even try to obtain last login
497 * time, e.g. AIX */
996d5e62 498 return (0);
499# elif defined(USE_WTMP) && \
500 (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP))
3c0ef626 501 /* retrieve last login time from utmp */
502 return (wtmp_get_entry(li));
996d5e62 503# elif defined(USE_WTMPX) && \
504 (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX))
3c0ef626 505 /* If wtmp isn't available, try wtmpx */
3c0ef626 506 return (wtmpx_get_entry(li));
996d5e62 507# else
3c0ef626 508 /* Give up: No means of retrieving last login time */
996d5e62 509 return (0);
3c0ef626 510# endif /* DISABLE_LASTLOG */
511#endif /* USE_LASTLOG */
512}
513
514
515
516/*
517 * 'line' string utility functions
518 *
519 * These functions process the 'line' string into one of three forms:
520 *
521 * 1. The full filename (including '/dev')
522 * 2. The stripped name (excluding '/dev')
523 * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00
524 * /dev/pts/1 -> ts/1 )
525 *
526 * Form 3 is used on some systems to identify a .tmp.? entry when
527 * attempting to remove it. Typically both addition and removal is
528 * performed by one application - say, sshd - so as long as the choice
529 * uniquely identifies a terminal it's ok.
530 */
531
532
996d5e62 533/*
534 * line_fullname(): add the leading '/dev/' if it doesn't exist make
535 * sure dst has enough space, if not just copy src (ugh)
536 */
3c0ef626 537char *
665a873d 538line_fullname(char *dst, const char *src, u_int dstsize)
3c0ef626 539{
540 memset(dst, '\0', dstsize);
996d5e62 541 if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5)))
3c0ef626 542 strlcpy(dst, src, dstsize);
996d5e62 543 else {
3c0ef626 544 strlcpy(dst, "/dev/", dstsize);
545 strlcat(dst, src, dstsize);
546 }
996d5e62 547 return (dst);
3c0ef626 548}
549
550/* line_stripname(): strip the leading '/dev' if it exists, return dst */
551char *
552line_stripname(char *dst, const char *src, int dstsize)
553{
554 memset(dst, '\0', dstsize);
555 if (strncmp(src, "/dev/", 5) == 0)
556 strlcpy(dst, src + 5, dstsize);
557 else
558 strlcpy(dst, src, dstsize);
996d5e62 559 return (dst);
3c0ef626 560}
561
665a873d 562/*
996d5e62 563 * line_abbrevname(): Return the abbreviated (usually four-character)
3c0ef626 564 * form of the line (Just use the last <dstsize> characters of the
565 * full name.)
566 *
567 * NOTE: use strncpy because we do NOT necessarily want zero
996d5e62 568 * termination
569 */
3c0ef626 570char *
571line_abbrevname(char *dst, const char *src, int dstsize)
572{
573 size_t len;
574
575 memset(dst, '\0', dstsize);
576
577 /* Always skip prefix if present */
578 if (strncmp(src, "/dev/", 5) == 0)
579 src += 5;
580
700318f3 581#ifdef WITH_ABBREV_NO_TTY
582 if (strncmp(src, "tty", 3) == 0)
583 src += 3;
584#endif
585
3c0ef626 586 len = strlen(src);
587
588 if (len > 0) {
589 if (((int)len - dstsize) > 0)
590 src += ((int)len - dstsize);
591
592 /* note: _don't_ change this to strlcpy */
593 strncpy(dst, src, (size_t)dstsize);
594 }
595
996d5e62 596 return (dst);
3c0ef626 597}
598
599/**
600 ** utmp utility functions
601 **
602 ** These functions manipulate struct utmp, taking system differences
603 ** into account.
604 **/
605
606#if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN)
607
608/* build the utmp structure */
609void
610set_utmp_time(struct logininfo *li, struct utmp *ut)
611{
996d5e62 612# if defined(HAVE_TV_IN_UTMP)
3c0ef626 613 ut->ut_tv.tv_sec = li->tv_sec;
614 ut->ut_tv.tv_usec = li->tv_usec;
996d5e62 615# elif defined(HAVE_TIME_IN_UTMP)
3c0ef626 616 ut->ut_time = li->tv_sec;
3c0ef626 617# endif
618}
619
620void
621construct_utmp(struct logininfo *li,
622 struct utmp *ut)
623{
6a9b3198 624# ifdef HAVE_ADDR_V6_IN_UTMP
625 struct sockaddr_in6 *sa6;
996d5e62 626# endif
627
3c0ef626 628 memset(ut, '\0', sizeof(*ut));
629
630 /* First fill out fields used for both logins and logouts */
631
632# ifdef HAVE_ID_IN_UTMP
633 line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id));
634# endif
635
636# ifdef HAVE_TYPE_IN_UTMP
637 /* This is done here to keep utmp constants out of struct logininfo */
638 switch (li->type) {
639 case LTYPE_LOGIN:
640 ut->ut_type = USER_PROCESS;
41b2f314 641#ifdef _UNICOS
3c0ef626 642 cray_set_tmpdir(ut);
643#endif
644 break;
645 case LTYPE_LOGOUT:
646 ut->ut_type = DEAD_PROCESS;
41b2f314 647#ifdef _UNICOS
3c0ef626 648 cray_retain_utmp(ut, li->pid);
649#endif
650 break;
651 }
652# endif
653 set_utmp_time(li, ut);
654
655 line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line));
656
657# ifdef HAVE_PID_IN_UTMP
658 ut->ut_pid = li->pid;
659# endif
660
661 /* If we're logging out, leave all other fields blank */
662 if (li->type == LTYPE_LOGOUT)
996d5e62 663 return;
3c0ef626 664
665 /*
666 * These fields are only used when logging in, and are blank
667 * for logouts.
668 */
669
670 /* Use strncpy because we don't necessarily want null termination */
996d5e62 671 strncpy(ut->ut_name, li->username,
672 MIN_SIZEOF(ut->ut_name, li->username));
3c0ef626 673# ifdef HAVE_HOST_IN_UTMP
996d5e62 674 strncpy(ut->ut_host, li->hostname,
675 MIN_SIZEOF(ut->ut_host, li->hostname));
3c0ef626 676# endif
677# ifdef HAVE_ADDR_IN_UTMP
678 /* this is just a 32-bit IP address */
679 if (li->hostaddr.sa.sa_family == AF_INET)
680 ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
681# endif
6a9b3198 682# ifdef HAVE_ADDR_V6_IN_UTMP
683 /* this is just a 128-bit IPv6 address */
684 if (li->hostaddr.sa.sa_family == AF_INET6) {
685 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa);
686 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16);
687 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
688 ut->ut_addr_v6[0] = ut->ut_addr_v6[3];
689 ut->ut_addr_v6[1] = 0;
690 ut->ut_addr_v6[2] = 0;
691 ut->ut_addr_v6[3] = 0;
692 }
693 }
694# endif
3c0ef626 695}
696#endif /* USE_UTMP || USE_WTMP || USE_LOGIN */
697
698/**
699 ** utmpx utility functions
700 **
701 ** These functions manipulate struct utmpx, accounting for system
702 ** variations.
703 **/
704
705#if defined(USE_UTMPX) || defined (USE_WTMPX)
706/* build the utmpx structure */
707void
708set_utmpx_time(struct logininfo *li, struct utmpx *utx)
709{
996d5e62 710# if defined(HAVE_TV_IN_UTMPX)
3c0ef626 711 utx->ut_tv.tv_sec = li->tv_sec;
712 utx->ut_tv.tv_usec = li->tv_usec;
996d5e62 713# elif defined(HAVE_TIME_IN_UTMPX)
3c0ef626 714 utx->ut_time = li->tv_sec;
996d5e62 715# endif
3c0ef626 716}
717
718void
719construct_utmpx(struct logininfo *li, struct utmpx *utx)
720{
6a9b3198 721# ifdef HAVE_ADDR_V6_IN_UTMP
722 struct sockaddr_in6 *sa6;
723# endif
3c0ef626 724 memset(utx, '\0', sizeof(*utx));
996d5e62 725
3c0ef626 726# ifdef HAVE_ID_IN_UTMPX
727 line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id));
728# endif
729
730 /* this is done here to keep utmp constants out of loginrec.h */
731 switch (li->type) {
732 case LTYPE_LOGIN:
733 utx->ut_type = USER_PROCESS;
734 break;
735 case LTYPE_LOGOUT:
736 utx->ut_type = DEAD_PROCESS;
737 break;
738 }
739 line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line));
740 set_utmpx_time(li, utx);
741 utx->ut_pid = li->pid;
996d5e62 742
e9a17296 743 /* strncpy(): Don't necessarily want null termination */
996d5e62 744 strncpy(utx->ut_name, li->username,
745 MIN_SIZEOF(utx->ut_name, li->username));
3c0ef626 746
747 if (li->type == LTYPE_LOGOUT)
748 return;
749
750 /*
751 * These fields are only used when logging in, and are blank
752 * for logouts.
753 */
754
3c0ef626 755# ifdef HAVE_HOST_IN_UTMPX
996d5e62 756 strncpy(utx->ut_host, li->hostname,
757 MIN_SIZEOF(utx->ut_host, li->hostname));
3c0ef626 758# endif
759# ifdef HAVE_ADDR_IN_UTMPX
760 /* this is just a 32-bit IP address */
761 if (li->hostaddr.sa.sa_family == AF_INET)
762 utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
763# endif
6a9b3198 764# ifdef HAVE_ADDR_V6_IN_UTMP
765 /* this is just a 128-bit IPv6 address */
766 if (li->hostaddr.sa.sa_family == AF_INET6) {
767 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa);
768 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16);
769 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
770 ut->ut_addr_v6[0] = ut->ut_addr_v6[3];
771 ut->ut_addr_v6[1] = 0;
772 ut->ut_addr_v6[2] = 0;
773 ut->ut_addr_v6[3] = 0;
774 }
775 }
776# endif
3c0ef626 777# ifdef HAVE_SYSLEN_IN_UTMPX
778 /* ut_syslen is the length of the utx_host string */
779 utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host));
780# endif
781}
782#endif /* USE_UTMPX || USE_WTMPX */
783
784/**
785 ** Low-level utmp functions
786 **/
787
788/* FIXME: (ATL) utmp_write_direct needs testing */
789#ifdef USE_UTMP
790
791/* if we can, use pututline() etc. */
792# if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \
793 defined(HAVE_PUTUTLINE)
794# define UTMP_USE_LIBRARY
795# endif
796
797
798/* write a utmp entry with the system's help (pututline() and pals) */
799# ifdef UTMP_USE_LIBRARY
800static int
801utmp_write_library(struct logininfo *li, struct utmp *ut)
802{
803 setutent();
804 pututline(ut);
3c0ef626 805# ifdef HAVE_ENDUTENT
806 endutent();
807# endif
996d5e62 808 return (1);
3c0ef626 809}
810# else /* UTMP_USE_LIBRARY */
811
665a873d 812/*
996d5e62 813 * Write a utmp entry direct to the file
814 * This is a slightly modification of code in OpenBSD's login.c
815 */
3c0ef626 816static int
817utmp_write_direct(struct logininfo *li, struct utmp *ut)
818{
819 struct utmp old_ut;
820 register int fd;
821 int tty;
822
823 /* FIXME: (ATL) ttyslot() needs local implementation */
824
825#if defined(HAVE_GETTTYENT)
996d5e62 826 struct ttyent *ty;
3c0ef626 827
828 tty=0;
3c0ef626 829 setttyent();
996d5e62 830 while (NULL != (ty = getttyent())) {
3c0ef626 831 tty++;
832 if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line)))
833 break;
834 }
835 endttyent();
836
996d5e62 837 if (NULL == ty) {
c9f39d2c 838 logit("%s: tty not found", __func__);
839 return (0);
3c0ef626 840 }
841#else /* FIXME */
842
843 tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */
844
845#endif /* HAVE_GETTTYENT */
846
847 if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) {
c9f39d2c 848 off_t pos, ret;
849
850 pos = (off_t)tty * sizeof(struct utmp);
851 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) {
996d5e62 852 logit("%s: lseek: %s", __func__, strerror(errno));
c9f39d2c 853 return (0);
854 }
855 if (ret != pos) {
665a873d 856 logit("%s: Couldn't seek to tty %d slot in %s",
996d5e62 857 __func__, tty, UTMP_FILE);
c9f39d2c 858 return (0);
859 }
3c0ef626 860 /*
861 * Prevent luser from zero'ing out ut_host.
862 * If the new ut_line is empty but the old one is not
863 * and ut_line and ut_name match, preserve the old ut_line.
864 */
865 if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) &&
996d5e62 866 (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') &&
867 (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) &&
868 (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0))
869 memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host));
3c0ef626 870
c9f39d2c 871 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) {
996d5e62 872 logit("%s: lseek: %s", __func__, strerror(errno));
c9f39d2c 873 return (0);
874 }
875 if (ret != pos) {
996d5e62 876 logit("%s: Couldn't seek to tty %d slot in %s",
c9f39d2c 877 __func__, tty, UTMP_FILE);
878 return (0);
879 }
996d5e62 880 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
c9f39d2c 881 logit("%s: error writing %s: %s", __func__,
3c0ef626 882 UTMP_FILE, strerror(errno));
996d5e62 883 }
3c0ef626 884
996d5e62 885 close(fd);
886 return (1);
3c0ef626 887 } else {
996d5e62 888 return (0);
3c0ef626 889 }
890}
891# endif /* UTMP_USE_LIBRARY */
892
893static int
894utmp_perform_login(struct logininfo *li)
895{
896 struct utmp ut;
897
898 construct_utmp(li, &ut);
899# ifdef UTMP_USE_LIBRARY
900 if (!utmp_write_library(li, &ut)) {
996d5e62 901 logit("%s: utmp_write_library() failed", __func__);
902 return (0);
3c0ef626 903 }
904# else
905 if (!utmp_write_direct(li, &ut)) {
996d5e62 906 logit("%s: utmp_write_direct() failed", __func__);
907 return (0);
3c0ef626 908 }
909# endif
996d5e62 910 return (1);
3c0ef626 911}
912
913
914static int
915utmp_perform_logout(struct logininfo *li)
916{
917 struct utmp ut;
918
919 construct_utmp(li, &ut);
920# ifdef UTMP_USE_LIBRARY
921 if (!utmp_write_library(li, &ut)) {
996d5e62 922 logit("%s: utmp_write_library() failed", __func__);
923 return (0);
3c0ef626 924 }
925# else
926 if (!utmp_write_direct(li, &ut)) {
996d5e62 927 logit("%s: utmp_write_direct() failed", __func__);
928 return (0);
3c0ef626 929 }
930# endif
996d5e62 931 return (1);
3c0ef626 932}
933
934
935int
936utmp_write_entry(struct logininfo *li)
937{
938 switch(li->type) {
939 case LTYPE_LOGIN:
996d5e62 940 return (utmp_perform_login(li));
3c0ef626 941
942 case LTYPE_LOGOUT:
996d5e62 943 return (utmp_perform_logout(li));
3c0ef626 944
945 default:
996d5e62 946 logit("%s: invalid type field", __func__);
947 return (0);
3c0ef626 948 }
949}
950#endif /* USE_UTMP */
951
952
953/**
954 ** Low-level utmpx functions
955 **/
956
957/* not much point if we don't want utmpx entries */
958#ifdef USE_UTMPX
959
960/* if we have the wherewithall, use pututxline etc. */
961# if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \
962 defined(HAVE_PUTUTXLINE)
963# define UTMPX_USE_LIBRARY
964# endif
965
966
967/* write a utmpx entry with the system's help (pututxline() and pals) */
968# ifdef UTMPX_USE_LIBRARY
969static int
970utmpx_write_library(struct logininfo *li, struct utmpx *utx)
971{
972 setutxent();
973 pututxline(utx);
974
975# ifdef HAVE_ENDUTXENT
976 endutxent();
977# endif
996d5e62 978 return (1);
3c0ef626 979}
980
981# else /* UTMPX_USE_LIBRARY */
982
983/* write a utmp entry direct to the file */
984static int
985utmpx_write_direct(struct logininfo *li, struct utmpx *utx)
986{
996d5e62 987 logit("%s: not implemented!", __func__);
988 return (0);
3c0ef626 989}
990# endif /* UTMPX_USE_LIBRARY */
991
992static int
993utmpx_perform_login(struct logininfo *li)
994{
995 struct utmpx utx;
996
997 construct_utmpx(li, &utx);
998# ifdef UTMPX_USE_LIBRARY
999 if (!utmpx_write_library(li, &utx)) {
996d5e62 1000 logit("%s: utmp_write_library() failed", __func__);
1001 return (0);
3c0ef626 1002 }
1003# else
1004 if (!utmpx_write_direct(li, &ut)) {
996d5e62 1005 logit("%s: utmp_write_direct() failed", __func__);
1006 return (0);
3c0ef626 1007 }
1008# endif
996d5e62 1009 return (1);
3c0ef626 1010}
1011
1012
1013static int
1014utmpx_perform_logout(struct logininfo *li)
1015{
1016 struct utmpx utx;
1017
e9a17296 1018 construct_utmpx(li, &utx);
3c0ef626 1019# ifdef HAVE_ID_IN_UTMPX
1020 line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id));
1021# endif
1022# ifdef HAVE_TYPE_IN_UTMPX
1023 utx.ut_type = DEAD_PROCESS;
1024# endif
1025
1026# ifdef UTMPX_USE_LIBRARY
1027 utmpx_write_library(li, &utx);
1028# else
1029 utmpx_write_direct(li, &utx);
1030# endif
996d5e62 1031 return (1);
3c0ef626 1032}
1033
1034int
1035utmpx_write_entry(struct logininfo *li)
1036{
1037 switch(li->type) {
1038 case LTYPE_LOGIN:
996d5e62 1039 return (utmpx_perform_login(li));
3c0ef626 1040 case LTYPE_LOGOUT:
996d5e62 1041 return (utmpx_perform_logout(li));
3c0ef626 1042 default:
996d5e62 1043 logit("%s: invalid type field", __func__);
1044 return (0);
3c0ef626 1045 }
1046}
1047#endif /* USE_UTMPX */
1048
1049
1050/**
1051 ** Low-level wtmp functions
1052 **/
1053
1054#ifdef USE_WTMP
1055
665a873d 1056/*
996d5e62 1057 * Write a wtmp entry direct to the end of the file
1058 * This is a slight modification of code in OpenBSD's logwtmp.c
1059 */
3c0ef626 1060static int
1061wtmp_write(struct logininfo *li, struct utmp *ut)
1062{
1063 struct stat buf;
1064 int fd, ret = 1;
1065
1066 if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
996d5e62 1067 logit("%s: problem writing %s: %s", __func__,
3c0ef626 1068 WTMP_FILE, strerror(errno));
996d5e62 1069 return (0);
3c0ef626 1070 }
1071 if (fstat(fd, &buf) == 0)
0fff78ff 1072 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
3c0ef626 1073 ftruncate(fd, buf.st_size);
996d5e62 1074 logit("%s: problem writing %s: %s", __func__,
3c0ef626 1075 WTMP_FILE, strerror(errno));
1076 ret = 0;
1077 }
996d5e62 1078 close(fd);
1079 return (ret);
3c0ef626 1080}
1081
1082static int
1083wtmp_perform_login(struct logininfo *li)
1084{
1085 struct utmp ut;
1086
1087 construct_utmp(li, &ut);
996d5e62 1088 return (wtmp_write(li, &ut));
3c0ef626 1089}
1090
1091
1092static int
1093wtmp_perform_logout(struct logininfo *li)
1094{
1095 struct utmp ut;
1096
1097 construct_utmp(li, &ut);
996d5e62 1098 return (wtmp_write(li, &ut));
3c0ef626 1099}
1100
1101
1102int
1103wtmp_write_entry(struct logininfo *li)
1104{
1105 switch(li->type) {
1106 case LTYPE_LOGIN:
996d5e62 1107 return (wtmp_perform_login(li));
3c0ef626 1108 case LTYPE_LOGOUT:
996d5e62 1109 return (wtmp_perform_logout(li));
3c0ef626 1110 default:
996d5e62 1111 logit("%s: invalid type field", __func__);
1112 return (0);
3c0ef626 1113 }
1114}
1115
1116
665a873d 1117/*
996d5e62 1118 * Notes on fetching login data from wtmp/wtmpx
3c0ef626 1119 *
1120 * Logouts are usually recorded with (amongst other things) a blank
1121 * username on a given tty line. However, some systems (HP-UX is one)
1122 * leave all fields set, but change the ut_type field to DEAD_PROCESS.
1123 *
1124 * Since we're only looking for logins here, we know that the username
1125 * must be set correctly. On systems that leave it in, we check for
1126 * ut_type==USER_PROCESS (indicating a login.)
1127 *
1128 * Portability: Some systems may set something other than USER_PROCESS
1129 * to indicate a login process. I don't know of any as I write. Also,
1130 * it's possible that some systems may both leave the username in
1131 * place and not have ut_type.
1132 */
1133
1134/* return true if this wtmp entry indicates a login */
1135static int
1136wtmp_islogin(struct logininfo *li, struct utmp *ut)
1137{
1138 if (strncmp(li->username, ut->ut_name,
996d5e62 1139 MIN_SIZEOF(li->username, ut->ut_name)) == 0) {
3c0ef626 1140# ifdef HAVE_TYPE_IN_UTMP
1141 if (ut->ut_type & USER_PROCESS)
996d5e62 1142 return (1);
3c0ef626 1143# else
996d5e62 1144 return (1);
3c0ef626 1145# endif
1146 }
996d5e62 1147 return (0);
3c0ef626 1148}
1149
1150int
1151wtmp_get_entry(struct logininfo *li)
1152{
1153 struct stat st;
1154 struct utmp ut;
996d5e62 1155 int fd, found = 0;
3c0ef626 1156
1157 /* Clear the time entries in our logininfo */
1158 li->tv_sec = li->tv_usec = 0;
1159
1160 if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) {
665a873d 1161 logit("%s: problem opening %s: %s", __func__,
3c0ef626 1162 WTMP_FILE, strerror(errno));
996d5e62 1163 return (0);
3c0ef626 1164 }
1165 if (fstat(fd, &st) != 0) {
665a873d 1166 logit("%s: couldn't stat %s: %s", __func__,
3c0ef626 1167 WTMP_FILE, strerror(errno));
1168 close(fd);
996d5e62 1169 return (0);
3c0ef626 1170 }
1171
1172 /* Seek to the start of the last struct utmp */
1173 if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) {
1174 /* Looks like we've got a fresh wtmp file */
1175 close(fd);
996d5e62 1176 return (0);
3c0ef626 1177 }
1178
1179 while (!found) {
1180 if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) {
665a873d 1181 logit("%s: read of %s failed: %s", __func__,
3c0ef626 1182 WTMP_FILE, strerror(errno));
1183 close (fd);
996d5e62 1184 return (0);
3c0ef626 1185 }
1186 if ( wtmp_islogin(li, &ut) ) {
1187 found = 1;
996d5e62 1188 /*
1189 * We've already checked for a time in struct
1190 * utmp, in login_getlast()
1191 */
3c0ef626 1192# ifdef HAVE_TIME_IN_UTMP
1193 li->tv_sec = ut.ut_time;
1194# else
1195# if HAVE_TV_IN_UTMP
1196 li->tv_sec = ut.ut_tv.tv_sec;
1197# endif
1198# endif
1199 line_fullname(li->line, ut.ut_line,
996d5e62 1200 MIN_SIZEOF(li->line, ut.ut_line));
3c0ef626 1201# ifdef HAVE_HOST_IN_UTMP
1202 strlcpy(li->hostname, ut.ut_host,
996d5e62 1203 MIN_SIZEOF(li->hostname, ut.ut_host));
3c0ef626 1204# endif
1205 continue;
1206 }
1207 /* Seek back 2 x struct utmp */
1208 if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) {
1209 /* We've found the start of the file, so quit */
996d5e62 1210 close(fd);
1211 return (0);
3c0ef626 1212 }
1213 }
1214
1215 /* We found an entry. Tidy up and return */
1216 close(fd);
996d5e62 1217 return (1);
3c0ef626 1218}
1219# endif /* USE_WTMP */
1220
1221
1222/**
1223 ** Low-level wtmpx functions
1224 **/
1225
1226#ifdef USE_WTMPX
996d5e62 1227/*
1228 * Write a wtmpx entry direct to the end of the file
1229 * This is a slight modification of code in OpenBSD's logwtmp.c
1230 */
3c0ef626 1231static int
1232wtmpx_write(struct logininfo *li, struct utmpx *utx)
1233{
cdd66111 1234#ifndef HAVE_UPDWTMPX
3c0ef626 1235 struct stat buf;
1236 int fd, ret = 1;
1237
1238 if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
665a873d 1239 logit("%s: problem opening %s: %s", __func__,
3c0ef626 1240 WTMPX_FILE, strerror(errno));
996d5e62 1241 return (0);
3c0ef626 1242 }
1243
1244 if (fstat(fd, &buf) == 0)
0fff78ff 1245 if (atomicio(vwrite, fd, utx, sizeof(*utx)) != sizeof(*utx)) {
3c0ef626 1246 ftruncate(fd, buf.st_size);
996d5e62 1247 logit("%s: problem writing %s: %s", __func__,
3c0ef626 1248 WTMPX_FILE, strerror(errno));
1249 ret = 0;
1250 }
996d5e62 1251 close(fd);
3c0ef626 1252
996d5e62 1253 return (ret);
cdd66111 1254#else
1255 updwtmpx(WTMPX_FILE, utx);
996d5e62 1256 return (1);
cdd66111 1257#endif
3c0ef626 1258}
1259
1260
1261static int
1262wtmpx_perform_login(struct logininfo *li)
1263{
1264 struct utmpx utx;
1265
1266 construct_utmpx(li, &utx);
996d5e62 1267 return (wtmpx_write(li, &utx));
3c0ef626 1268}
1269
1270
1271static int
1272wtmpx_perform_logout(struct logininfo *li)
1273{
1274 struct utmpx utx;
1275
1276 construct_utmpx(li, &utx);
996d5e62 1277 return (wtmpx_write(li, &utx));
3c0ef626 1278}
1279
1280
1281int
1282wtmpx_write_entry(struct logininfo *li)
1283{
1284 switch(li->type) {
1285 case LTYPE_LOGIN:
996d5e62 1286 return (wtmpx_perform_login(li));
3c0ef626 1287 case LTYPE_LOGOUT:
996d5e62 1288 return (wtmpx_perform_logout(li));
3c0ef626 1289 default:
996d5e62 1290 logit("%s: invalid type field", __func__);
1291 return (0);
3c0ef626 1292 }
1293}
1294
1295/* Please see the notes above wtmp_islogin() for information about the
1296 next two functions */
1297
1298/* Return true if this wtmpx entry indicates a login */
1299static int
1300wtmpx_islogin(struct logininfo *li, struct utmpx *utx)
1301{
996d5e62 1302 if (strncmp(li->username, utx->ut_name,
1303 MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) {
3c0ef626 1304# ifdef HAVE_TYPE_IN_UTMPX
1305 if (utx->ut_type == USER_PROCESS)
996d5e62 1306 return (1);
3c0ef626 1307# else
996d5e62 1308 return (1);
3c0ef626 1309# endif
1310 }
996d5e62 1311 return (0);
3c0ef626 1312}
1313
1314
1315int
1316wtmpx_get_entry(struct logininfo *li)
1317{
1318 struct stat st;
1319 struct utmpx utx;
1320 int fd, found=0;
1321
1322 /* Clear the time entries */
1323 li->tv_sec = li->tv_usec = 0;
1324
1325 if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) {
665a873d 1326 logit("%s: problem opening %s: %s", __func__,
3c0ef626 1327 WTMPX_FILE, strerror(errno));
996d5e62 1328 return (0);
3c0ef626 1329 }
1330 if (fstat(fd, &st) != 0) {
665a873d 1331 logit("%s: couldn't stat %s: %s", __func__,
41b2f314 1332 WTMPX_FILE, strerror(errno));
3c0ef626 1333 close(fd);
996d5e62 1334 return (0);
3c0ef626 1335 }
1336
1337 /* Seek to the start of the last struct utmpx */
1338 if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) {
1339 /* probably a newly rotated wtmpx file */
1340 close(fd);
996d5e62 1341 return (0);
3c0ef626 1342 }
1343
1344 while (!found) {
1345 if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) {
665a873d 1346 logit("%s: read of %s failed: %s", __func__,
3c0ef626 1347 WTMPX_FILE, strerror(errno));
1348 close (fd);
996d5e62 1349 return (0);
3c0ef626 1350 }
996d5e62 1351 /*
665a873d 1352 * Logouts are recorded as a blank username on a particular
996d5e62 1353 * line. So, we just need to find the username in struct utmpx
1354 */
1355 if (wtmpx_islogin(li, &utx)) {
41b2f314 1356 found = 1;
996d5e62 1357# if defined(HAVE_TV_IN_UTMPX)
3c0ef626 1358 li->tv_sec = utx.ut_tv.tv_sec;
996d5e62 1359# elif defined(HAVE_TIME_IN_UTMPX)
3c0ef626 1360 li->tv_sec = utx.ut_time;
3c0ef626 1361# endif
1362 line_fullname(li->line, utx.ut_line, sizeof(li->line));
996d5e62 1363# if defined(HAVE_HOST_IN_UTMPX)
3c0ef626 1364 strlcpy(li->hostname, utx.ut_host,
996d5e62 1365 MIN_SIZEOF(li->hostname, utx.ut_host));
3c0ef626 1366# endif
1367 continue;
1368 }
1369 if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) {
996d5e62 1370 close(fd);
1371 return (0);
3c0ef626 1372 }
1373 }
1374
1375 close(fd);
996d5e62 1376 return (1);
3c0ef626 1377}
1378#endif /* USE_WTMPX */
1379
1380/**
1381 ** Low-level libutil login() functions
1382 **/
1383
1384#ifdef USE_LOGIN
1385static int
1386syslogin_perform_login(struct logininfo *li)
1387{
1388 struct utmp *ut;
1389
996d5e62 1390 ut = xmalloc(sizeof(*ut));
3c0ef626 1391 construct_utmp(li, ut);
1392 login(ut);
6a9b3198 1393 free(ut);
3c0ef626 1394
996d5e62 1395 return (1);
3c0ef626 1396}
1397
1398static int
1399syslogin_perform_logout(struct logininfo *li)
1400{
1401# ifdef HAVE_LOGOUT
99be0775 1402 char line[UT_LINESIZE];
3c0ef626 1403
1404 (void)line_stripname(line, li->line, sizeof(line));
1405
996d5e62 1406 if (!logout(line))
1407 logit("%s: logout() returned an error", __func__);
3c0ef626 1408# ifdef HAVE_LOGWTMP
996d5e62 1409 else
3c0ef626 1410 logwtmp(line, "", "");
1411# endif
3c0ef626 1412 /* FIXME: (ATL - if the need arises) What to do if we have
1413 * login, but no logout? what if logout but no logwtmp? All
1414 * routines are in libutil so they should all be there,
1415 * but... */
1416# endif
996d5e62 1417 return (1);
3c0ef626 1418}
1419
1420int
1421syslogin_write_entry(struct logininfo *li)
1422{
1423 switch (li->type) {
1424 case LTYPE_LOGIN:
996d5e62 1425 return (syslogin_perform_login(li));
3c0ef626 1426 case LTYPE_LOGOUT:
996d5e62 1427 return (syslogin_perform_logout(li));
3c0ef626 1428 default:
996d5e62 1429 logit("%s: Invalid type field", __func__);
1430 return (0);
3c0ef626 1431 }
1432}
1433#endif /* USE_LOGIN */
1434
1435/* end of file log-syslogin.c */
1436
1437/**
1438 ** Low-level lastlog functions
1439 **/
1440
1441#ifdef USE_LASTLOG
1442#define LL_FILE 1
1443#define LL_DIR 2
1444#define LL_OTHER 3
1445
1446static void
1447lastlog_construct(struct logininfo *li, struct lastlog *last)
1448{
1449 /* clear the structure */
1450 memset(last, '\0', sizeof(*last));
1451
996d5e62 1452 line_stripname(last->ll_line, li->line, sizeof(last->ll_line));
3c0ef626 1453 strlcpy(last->ll_host, li->hostname,
1454 MIN_SIZEOF(last->ll_host, li->hostname));
1455 last->ll_time = li->tv_sec;
1456}
1457
1458static int
1459lastlog_filetype(char *filename)
1460{
1461 struct stat st;
1462
1463 if (stat(LASTLOG_FILE, &st) != 0) {
996d5e62 1464 logit("%s: Couldn't stat %s: %s", __func__,
1465 LASTLOG_FILE, strerror(errno));
1466 return (0);
3c0ef626 1467 }
1468 if (S_ISDIR(st.st_mode))
996d5e62 1469 return (LL_DIR);
3c0ef626 1470 else if (S_ISREG(st.st_mode))
996d5e62 1471 return (LL_FILE);
3c0ef626 1472 else
996d5e62 1473 return (LL_OTHER);
3c0ef626 1474}
1475
1476
1477/* open the file (using filemode) and seek to the login entry */
1478static int
1479lastlog_openseek(struct logininfo *li, int *fd, int filemode)
1480{
1481 off_t offset;
1482 int type;
1483 char lastlog_file[1024];
1484
1485 type = lastlog_filetype(LASTLOG_FILE);
1486 switch (type) {
996d5e62 1487 case LL_FILE:
1488 strlcpy(lastlog_file, LASTLOG_FILE,
1489 sizeof(lastlog_file));
1490 break;
1491 case LL_DIR:
1492 snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s",
1493 LASTLOG_FILE, li->username);
1494 break;
1495 default:
1496 logit("%s: %.100s is not a file or directory!", __func__,
1497 LASTLOG_FILE);
1498 return (0);
3c0ef626 1499 }
1500
0fff78ff 1501 *fd = open(lastlog_file, filemode, 0600);
996d5e62 1502 if (*fd < 0) {
1503 debug("%s: Couldn't open %s: %s", __func__,
3c0ef626 1504 lastlog_file, strerror(errno));
996d5e62 1505 return (0);
3c0ef626 1506 }
1507
1508 if (type == LL_FILE) {
1509 /* find this uid's offset in the lastlog file */
1510 offset = (off_t) ((long)li->uid * sizeof(struct lastlog));
1511
996d5e62 1512 if (lseek(*fd, offset, SEEK_SET) != offset) {
1513 logit("%s: %s->lseek(): %s", __func__,
1514 lastlog_file, strerror(errno));
1515 return (0);
3c0ef626 1516 }
1517 }
1518
996d5e62 1519 return (1);
3c0ef626 1520}
1521
1522static int
1523lastlog_perform_login(struct logininfo *li)
1524{
1525 struct lastlog last;
1526 int fd;
1527
1528 /* create our struct lastlog */
1529 lastlog_construct(li, &last);
1530
1531 if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT))
996d5e62 1532 return (0);
3c0ef626 1533
1534 /* write the entry */
0fff78ff 1535 if (atomicio(vwrite, fd, &last, sizeof(last)) != sizeof(last)) {
3c0ef626 1536 close(fd);
996d5e62 1537 logit("%s: Error writing to %s: %s", __func__,
3c0ef626 1538 LASTLOG_FILE, strerror(errno));
996d5e62 1539 return (0);
3c0ef626 1540 }
1541
1542 close(fd);
996d5e62 1543 return (1);
3c0ef626 1544}
1545
1546int
1547lastlog_write_entry(struct logininfo *li)
1548{
1549 switch(li->type) {
1550 case LTYPE_LOGIN:
996d5e62 1551 return (lastlog_perform_login(li));
3c0ef626 1552 default:
996d5e62 1553 logit("%s: Invalid type field", __func__);
1554 return (0);
3c0ef626 1555 }
1556}
1557
1558static void
1559lastlog_populate_entry(struct logininfo *li, struct lastlog *last)
1560{
1561 line_fullname(li->line, last->ll_line, sizeof(li->line));
1562 strlcpy(li->hostname, last->ll_host,
996d5e62 1563 MIN_SIZEOF(li->hostname, last->ll_host));
3c0ef626 1564 li->tv_sec = last->ll_time;
1565}
1566
1567int
1568lastlog_get_entry(struct logininfo *li)
1569{
1570 struct lastlog last;
6a9b3198 1571 int fd, ret;
3c0ef626 1572
1573 if (!lastlog_openseek(li, &fd, O_RDONLY))
6a9b3198 1574 return (0);
3c0ef626 1575
6a9b3198 1576 ret = atomicio(read, fd, &last, sizeof(last));
3c0ef626 1577 close(fd);
1578
6a9b3198 1579 switch (ret) {
1580 case 0:
1581 memset(&last, '\0', sizeof(last));
1582 /* FALLTHRU */
1583 case sizeof(last):
1584 lastlog_populate_entry(li, &last);
1585 return (1);
1586 case -1:
cdd66111 1587 error("%s: Error reading from %s: %s", __func__,
6a9b3198 1588 LASTLOG_FILE, strerror(errno));
1589 return (0);
1590 default:
1591 error("%s: Error reading from %s: Expecting %d, got %d",
1592 __func__, LASTLOG_FILE, sizeof(last), ret);
1593 return (0);
1594 }
3c0ef626 1595
6a9b3198 1596 /* NOTREACHED */
1597 return (0);
3c0ef626 1598}
1599#endif /* USE_LASTLOG */
996d5e62 1600
1601#ifdef USE_BTMP
1602 /*
1603 * Logs failed login attempts in _PATH_BTMP if that exists.
1604 * The most common login failure is to give password instead of username.
1605 * So the _PATH_BTMP file checked for the correct permission, so that
1606 * only root can read it.
1607 */
1608
1609void
1610record_failed_login(const char *username, const char *hostname,
1611 const char *ttyn)
1612{
1613 int fd;
1614 struct utmp ut;
1615 struct sockaddr_storage from;
1616 size_t fromlen = sizeof(from);
1617 struct sockaddr_in *a4;
1618 struct sockaddr_in6 *a6;
1619 time_t t;
1620 struct stat fst;
1621
1622 if (geteuid() != 0)
1623 return;
1624 if ((fd = open(_PATH_BTMP, O_WRONLY | O_APPEND)) < 0) {
1625 debug("Unable to open the btmp file %s: %s", _PATH_BTMP,
1626 strerror(errno));
1627 return;
1628 }
1629 if (fstat(fd, &fst) < 0) {
1630 logit("%s: fstat of %s failed: %s", __func__, _PATH_BTMP,
1631 strerror(errno));
1632 goto out;
1633 }
1634 if((fst.st_mode & (S_IRWXG | S_IRWXO)) || (fst.st_uid != 0)){
1635 logit("Excess permission or bad ownership on file %s",
1636 _PATH_BTMP);
1637 goto out;
1638 }
1639
1640 memset(&ut, 0, sizeof(ut));
1641 /* strncpy because we don't necessarily want nul termination */
1642 strncpy(ut.ut_user, username, sizeof(ut.ut_user));
1643 strlcpy(ut.ut_line, "ssh:notty", sizeof(ut.ut_line));
1644
1645 time(&t);
1646 ut.ut_time = t; /* ut_time is not always a time_t */
1647 ut.ut_type = LOGIN_PROCESS;
1648 ut.ut_pid = getpid();
1649
1650 /* strncpy because we don't necessarily want nul termination */
1651 strncpy(ut.ut_host, hostname, sizeof(ut.ut_host));
1652
1653 if (packet_connection_is_on_socket() &&
1654 getpeername(packet_get_connection_in(),
1655 (struct sockaddr *)&from, &fromlen) == 0) {
1656 ipv64_normalise_mapped(&from, &fromlen);
1657 if (from.ss_family == AF_INET) {
1658 a4 = (struct sockaddr_in *)&from;
1659 memcpy(&ut.ut_addr, &(a4->sin_addr),
1660 MIN_SIZEOF(ut.ut_addr, a4->sin_addr));
1661 }
1662#ifdef HAVE_ADDR_V6_IN_UTMP
1663 if (from.ss_family == AF_INET6) {
1664 a6 = (struct sockaddr_in6 *)&from;
1665 memcpy(&ut.ut_addr_v6, &(a6->sin6_addr),
1666 MIN_SIZEOF(ut.ut_addr_v6, a6->sin6_addr));
1667 }
1668#endif
1669 }
1670
1671 if (atomicio(vwrite, fd, &ut, sizeof(ut)) != sizeof(ut))
1672 error("Failed to write to %s: %s", _PATH_BTMP,
1673 strerror(errno));
1674
1675out:
1676 close(fd);
1677}
1678#endif /* USE_BTMP */
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