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
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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.
29 * The btmp logging code is derived from login.c from util-linux and is under
30 * the the following license:
32 * Copyright (c) 1980, 1987, 1988 The Regents of the University of California.
33 * All rights reserved.
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.
50 ** loginrec.c: platform-independent login recording and lastlog retrieval
54 * The new login code explained
55 * ============================
57 * This code attempts to provide a common interface to login recording
58 * (utmp and friends) and last login time retrieval.
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.
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
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
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
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.
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.
99 * Calling the new code
100 * --------------------
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.
106 * Internal handler calling method
107 * -------------------------------
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.
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.
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.
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,
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.
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.)
145 * Otherwise, patches to the specific method(s) are very helpful!
148 #include "includes.h"
150 #include <sys/types.h>
151 #include <sys/stat.h>
152 #include <sys/socket.h>
154 #include <netinet/in.h>
160 #include "loginrec.h"
162 #include "atomicio.h"
164 #include "canohost.h"
172 #ifdef HAVE_LIBUTIL_H
173 # include <libutil.h>
177 ** prototypes for helper functions in this file
181 void set_utmp_time(struct logininfo *li, struct utmp *ut);
182 void construct_utmp(struct logininfo *li, struct utmp *ut);
186 void set_utmpx_time(struct logininfo *li, struct utmpx *ut);
187 void construct_utmpx(struct logininfo *li, struct utmpx *ut);
190 int utmp_write_entry(struct logininfo *li);
191 int utmpx_write_entry(struct logininfo *li);
192 int wtmp_write_entry(struct logininfo *li);
193 int wtmpx_write_entry(struct logininfo *li);
194 int lastlog_write_entry(struct logininfo *li);
195 int syslogin_write_entry(struct logininfo *li);
197 int getlast_entry(struct logininfo *li);
198 int lastlog_get_entry(struct logininfo *li);
199 int wtmp_get_entry(struct logininfo *li);
200 int wtmpx_get_entry(struct logininfo *li);
202 extern Buffer loginmsg;
204 /* pick the shortest string */
205 #define MIN_SIZEOF(s1,s2) (sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2))
208 ** platform-independent login functions
212 * login_login(struct logininfo *) - Record a login
214 * Call with a pointer to a struct logininfo initialised with
215 * login_init_entry() or login_alloc_entry()
219 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
222 login_login(struct logininfo *li)
224 li->type = LTYPE_LOGIN;
225 return (login_write(li));
230 * login_logout(struct logininfo *) - Record a logout
232 * Call as with login_login()
236 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
239 login_logout(struct logininfo *li)
241 li->type = LTYPE_LOGOUT;
242 return (login_write(li));
246 * login_get_lastlog_time(int) - Retrieve the last login time
248 * Retrieve the last login time for the given uid. Will try to use the
249 * system lastlog facilities if they are available, but will fall back
250 * to looking in wtmp/wtmpx if necessary
253 * 0 on failure, or if user has never logged in
254 * Time in seconds from the epoch if successful
256 * Useful preprocessor symbols:
257 * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog
259 * USE_LASTLOG: If set, indicates the presence of system lastlog
260 * facilities. If this and DISABLE_LASTLOG are not set,
261 * try to retrieve lastlog information from wtmp/wtmpx.
264 login_get_lastlog_time(const int uid)
268 if (login_get_lastlog(&li, uid))
275 * login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry
277 * Retrieve a logininfo structure populated (only partially) with
278 * information from the system lastlog data, or from wtmp/wtmpx if no
279 * system lastlog information exists.
281 * Note this routine must be given a pre-allocated logininfo.
284 * >0: A pointer to your struct logininfo if successful
285 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
288 login_get_lastlog(struct logininfo *li, const int uid)
292 memset(li, '\0', sizeof(*li));
296 * If we don't have a 'real' lastlog, we need the username to
297 * reliably search wtmp(x) for the last login (see
302 fatal("%s: Cannot find account for uid %i", __func__, uid);
304 /* No MIN_SIZEOF here - we absolutely *must not* truncate the
305 * username (XXX - so check for trunc!) */
306 strlcpy(li->username, pw->pw_name, sizeof(li->username));
308 if (getlast_entry(li))
316 * login_alloc_entry(int, char*, char*, char*) - Allocate and initialise
317 * a logininfo structure
319 * This function creates a new struct logininfo, a data structure
320 * meant to carry the information required to portably record login info.
322 * Returns a pointer to a newly created struct logininfo. If memory
323 * allocation fails, the program halts.
326 logininfo *login_alloc_entry(int pid, const char *username,
327 const char *hostname, const char *line)
329 struct logininfo *newli;
331 newli = xmalloc(sizeof(*newli));
332 login_init_entry(newli, pid, username, hostname, line);
337 /* login_free_entry(struct logininfo *) - free struct memory */
339 login_free_entry(struct logininfo *li)
345 /* login_init_entry(struct logininfo *, int, char*, char*, char*)
346 * - initialise a struct logininfo
348 * Populates a new struct logininfo, a data structure meant to carry
349 * the information required to portably record login info.
354 login_init_entry(struct logininfo *li, int pid, const char *username,
355 const char *hostname, const char *line)
359 memset(li, 0, sizeof(*li));
363 /* set the line information */
365 line_fullname(li->line, line, sizeof(li->line));
368 strlcpy(li->username, username, sizeof(li->username));
369 pw = getpwnam(li->username);
371 fatal("%s: Cannot find user \"%s\"", __func__,
374 li->uid = pw->pw_uid;
378 strlcpy(li->hostname, hostname, sizeof(li->hostname));
384 * login_set_current_time(struct logininfo *) - set the current time
386 * Set the current time in a logininfo structure. This function is
387 * meant to eliminate the need to deal with system dependencies for
391 login_set_current_time(struct logininfo *li)
395 gettimeofday(&tv, NULL);
397 li->tv_sec = tv.tv_sec;
398 li->tv_usec = tv.tv_usec;
401 /* copy a sockaddr_* into our logininfo */
403 login_set_addr(struct logininfo *li, const struct sockaddr *sa,
404 const unsigned int sa_size)
406 unsigned int bufsize = sa_size;
408 /* make sure we don't overrun our union */
409 if (sizeof(li->hostaddr) < sa_size)
410 bufsize = sizeof(li->hostaddr);
412 memcpy(&li->hostaddr.sa, sa, bufsize);
417 ** login_write: Call low-level recording functions based on autoconf
421 login_write(struct logininfo *li)
424 if (geteuid() != 0) {
425 logit("Attempt to write login records by non-root user (aborting)");
430 /* set the timestamp */
431 login_set_current_time(li);
433 syslogin_write_entry(li);
436 if (li->type == LTYPE_LOGIN)
437 lastlog_write_entry(li);
440 utmp_write_entry(li);
443 wtmp_write_entry(li);
446 utmpx_write_entry(li);
449 wtmpx_write_entry(li);
451 #ifdef CUSTOM_SYS_AUTH_RECORD_LOGIN
452 if (li->type == LTYPE_LOGIN &&
453 !sys_auth_record_login(li->username,li->hostname,li->line,
455 logit("Writing login record failed for %s", li->username);
457 #ifdef SSH_AUDIT_EVENTS
458 if (li->type == LTYPE_LOGIN)
459 audit_session_open(li->line);
460 else if (li->type == LTYPE_LOGOUT)
461 audit_session_close(li->line);
466 #ifdef LOGIN_NEEDS_UTMPX
468 login_utmp_only(struct logininfo *li)
470 li->type = LTYPE_LOGIN;
471 login_set_current_time(li);
473 utmp_write_entry(li);
476 wtmp_write_entry(li);
479 utmpx_write_entry(li);
482 wtmpx_write_entry(li);
489 ** getlast_entry: Call low-level functions to retrieve the last login
493 /* take the uid in li and return the last login time */
495 getlast_entry(struct logininfo *li)
498 return(lastlog_get_entry(li));
499 #else /* !USE_LASTLOG */
501 #if defined(DISABLE_LASTLOG)
502 /* On some systems we shouldn't even try to obtain last login
505 # elif defined(USE_WTMP) && \
506 (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP))
507 /* retrieve last login time from utmp */
508 return (wtmp_get_entry(li));
509 # elif defined(USE_WTMPX) && \
510 (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX))
511 /* If wtmp isn't available, try wtmpx */
512 return (wtmpx_get_entry(li));
514 /* Give up: No means of retrieving last login time */
516 # endif /* DISABLE_LASTLOG */
517 #endif /* USE_LASTLOG */
523 * 'line' string utility functions
525 * These functions process the 'line' string into one of three forms:
527 * 1. The full filename (including '/dev')
528 * 2. The stripped name (excluding '/dev')
529 * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00
530 * /dev/pts/1 -> ts/1 )
532 * Form 3 is used on some systems to identify a .tmp.? entry when
533 * attempting to remove it. Typically both addition and removal is
534 * performed by one application - say, sshd - so as long as the choice
535 * uniquely identifies a terminal it's ok.
540 * line_fullname(): add the leading '/dev/' if it doesn't exist make
541 * sure dst has enough space, if not just copy src (ugh)
544 line_fullname(char *dst, const char *src, u_int dstsize)
546 memset(dst, '\0', dstsize);
547 if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5)))
548 strlcpy(dst, src, dstsize);
550 strlcpy(dst, "/dev/", dstsize);
551 strlcat(dst, src, dstsize);
556 /* line_stripname(): strip the leading '/dev' if it exists, return dst */
558 line_stripname(char *dst, const char *src, int dstsize)
560 memset(dst, '\0', dstsize);
561 if (strncmp(src, "/dev/", 5) == 0)
562 strlcpy(dst, src + 5, dstsize);
564 strlcpy(dst, src, dstsize);
569 * line_abbrevname(): Return the abbreviated (usually four-character)
570 * form of the line (Just use the last <dstsize> characters of the
573 * NOTE: use strncpy because we do NOT necessarily want zero
577 line_abbrevname(char *dst, const char *src, int dstsize)
581 memset(dst, '\0', dstsize);
583 /* Always skip prefix if present */
584 if (strncmp(src, "/dev/", 5) == 0)
587 #ifdef WITH_ABBREV_NO_TTY
588 if (strncmp(src, "tty", 3) == 0)
595 if (((int)len - dstsize) > 0)
596 src += ((int)len - dstsize);
598 /* note: _don't_ change this to strlcpy */
599 strncpy(dst, src, (size_t)dstsize);
606 ** utmp utility functions
608 ** These functions manipulate struct utmp, taking system differences
612 #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN)
614 /* build the utmp structure */
616 set_utmp_time(struct logininfo *li, struct utmp *ut)
618 # if defined(HAVE_TV_IN_UTMP)
619 ut->ut_tv.tv_sec = li->tv_sec;
620 ut->ut_tv.tv_usec = li->tv_usec;
621 # elif defined(HAVE_TIME_IN_UTMP)
622 ut->ut_time = li->tv_sec;
627 construct_utmp(struct logininfo *li,
630 # ifdef HAVE_ADDR_V6_IN_UTMP
631 struct sockaddr_in6 *sa6;
634 memset(ut, '\0', sizeof(*ut));
636 /* First fill out fields used for both logins and logouts */
638 # ifdef HAVE_ID_IN_UTMP
639 line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id));
642 # ifdef HAVE_TYPE_IN_UTMP
643 /* This is done here to keep utmp constants out of struct logininfo */
646 ut->ut_type = USER_PROCESS;
652 ut->ut_type = DEAD_PROCESS;
654 cray_retain_utmp(ut, li->pid);
659 set_utmp_time(li, ut);
661 line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line));
663 # ifdef HAVE_PID_IN_UTMP
664 ut->ut_pid = li->pid;
667 /* If we're logging out, leave all other fields blank */
668 if (li->type == LTYPE_LOGOUT)
672 * These fields are only used when logging in, and are blank
676 /* Use strncpy because we don't necessarily want null termination */
677 strncpy(ut->ut_name, li->username,
678 MIN_SIZEOF(ut->ut_name, li->username));
679 # ifdef HAVE_HOST_IN_UTMP
680 strncpy(ut->ut_host, li->hostname,
681 MIN_SIZEOF(ut->ut_host, li->hostname));
683 # ifdef HAVE_ADDR_IN_UTMP
684 /* this is just a 32-bit IP address */
685 if (li->hostaddr.sa.sa_family == AF_INET)
686 ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
688 # ifdef HAVE_ADDR_V6_IN_UTMP
689 /* this is just a 128-bit IPv6 address */
690 if (li->hostaddr.sa.sa_family == AF_INET6) {
691 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa);
692 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16);
693 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
694 ut->ut_addr_v6[0] = ut->ut_addr_v6[3];
695 ut->ut_addr_v6[1] = 0;
696 ut->ut_addr_v6[2] = 0;
697 ut->ut_addr_v6[3] = 0;
702 #endif /* USE_UTMP || USE_WTMP || USE_LOGIN */
705 ** utmpx utility functions
707 ** These functions manipulate struct utmpx, accounting for system
711 #if defined(USE_UTMPX) || defined (USE_WTMPX)
712 /* build the utmpx structure */
714 set_utmpx_time(struct logininfo *li, struct utmpx *utx)
716 # if defined(HAVE_TV_IN_UTMPX)
717 utx->ut_tv.tv_sec = li->tv_sec;
718 utx->ut_tv.tv_usec = li->tv_usec;
719 # elif defined(HAVE_TIME_IN_UTMPX)
720 utx->ut_time = li->tv_sec;
725 construct_utmpx(struct logininfo *li, struct utmpx *utx)
727 # ifdef HAVE_ADDR_V6_IN_UTMP
728 struct sockaddr_in6 *sa6;
730 memset(utx, '\0', sizeof(*utx));
732 # ifdef HAVE_ID_IN_UTMPX
733 line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id));
736 /* this is done here to keep utmp constants out of loginrec.h */
739 utx->ut_type = USER_PROCESS;
742 utx->ut_type = DEAD_PROCESS;
745 line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line));
746 set_utmpx_time(li, utx);
747 utx->ut_pid = li->pid;
749 /* strncpy(): Don't necessarily want null termination */
750 strncpy(utx->ut_name, li->username,
751 MIN_SIZEOF(utx->ut_name, li->username));
753 if (li->type == LTYPE_LOGOUT)
757 * These fields are only used when logging in, and are blank
761 # ifdef HAVE_HOST_IN_UTMPX
762 strncpy(utx->ut_host, li->hostname,
763 MIN_SIZEOF(utx->ut_host, li->hostname));
765 # ifdef HAVE_ADDR_IN_UTMPX
766 /* this is just a 32-bit IP address */
767 if (li->hostaddr.sa.sa_family == AF_INET)
768 utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
770 # ifdef HAVE_ADDR_V6_IN_UTMP
771 /* this is just a 128-bit IPv6 address */
772 if (li->hostaddr.sa.sa_family == AF_INET6) {
773 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa);
774 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16);
775 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
776 ut->ut_addr_v6[0] = ut->ut_addr_v6[3];
777 ut->ut_addr_v6[1] = 0;
778 ut->ut_addr_v6[2] = 0;
779 ut->ut_addr_v6[3] = 0;
783 # ifdef HAVE_SYSLEN_IN_UTMPX
784 /* ut_syslen is the length of the utx_host string */
785 utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host));
788 #endif /* USE_UTMPX || USE_WTMPX */
791 ** Low-level utmp functions
794 /* FIXME: (ATL) utmp_write_direct needs testing */
797 /* if we can, use pututline() etc. */
798 # if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \
799 defined(HAVE_PUTUTLINE)
800 # define UTMP_USE_LIBRARY
804 /* write a utmp entry with the system's help (pututline() and pals) */
805 # ifdef UTMP_USE_LIBRARY
807 utmp_write_library(struct logininfo *li, struct utmp *ut)
811 # ifdef HAVE_ENDUTENT
816 # else /* UTMP_USE_LIBRARY */
819 * Write a utmp entry direct to the file
820 * This is a slightly modification of code in OpenBSD's login.c
823 utmp_write_direct(struct logininfo *li, struct utmp *ut)
829 /* FIXME: (ATL) ttyslot() needs local implementation */
831 #if defined(HAVE_GETTTYENT)
836 while (NULL != (ty = getttyent())) {
838 if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line)))
844 logit("%s: tty not found", __func__);
849 tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */
851 #endif /* HAVE_GETTTYENT */
853 if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) {
856 pos = (off_t)tty * sizeof(struct utmp);
857 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) {
858 logit("%s: lseek: %s", __func__, strerror(errno));
862 logit("%s: Couldn't seek to tty %d slot in %s",
863 __func__, tty, UTMP_FILE);
867 * Prevent luser from zero'ing out ut_host.
868 * If the new ut_line is empty but the old one is not
869 * and ut_line and ut_name match, preserve the old ut_line.
871 if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) &&
872 (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') &&
873 (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) &&
874 (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0))
875 memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host));
877 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) {
878 logit("%s: lseek: %s", __func__, strerror(errno));
882 logit("%s: Couldn't seek to tty %d slot in %s",
883 __func__, tty, UTMP_FILE);
886 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
887 logit("%s: error writing %s: %s", __func__,
888 UTMP_FILE, strerror(errno));
897 # endif /* UTMP_USE_LIBRARY */
900 utmp_perform_login(struct logininfo *li)
904 construct_utmp(li, &ut);
905 # ifdef UTMP_USE_LIBRARY
906 if (!utmp_write_library(li, &ut)) {
907 logit("%s: utmp_write_library() failed", __func__);
911 if (!utmp_write_direct(li, &ut)) {
912 logit("%s: utmp_write_direct() failed", __func__);
921 utmp_perform_logout(struct logininfo *li)
925 construct_utmp(li, &ut);
926 # ifdef UTMP_USE_LIBRARY
927 if (!utmp_write_library(li, &ut)) {
928 logit("%s: utmp_write_library() failed", __func__);
932 if (!utmp_write_direct(li, &ut)) {
933 logit("%s: utmp_write_direct() failed", __func__);
942 utmp_write_entry(struct logininfo *li)
946 return (utmp_perform_login(li));
949 return (utmp_perform_logout(li));
952 logit("%s: invalid type field", __func__);
956 #endif /* USE_UTMP */
960 ** Low-level utmpx functions
963 /* not much point if we don't want utmpx entries */
966 /* if we have the wherewithall, use pututxline etc. */
967 # if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \
968 defined(HAVE_PUTUTXLINE)
969 # define UTMPX_USE_LIBRARY
973 /* write a utmpx entry with the system's help (pututxline() and pals) */
974 # ifdef UTMPX_USE_LIBRARY
976 utmpx_write_library(struct logininfo *li, struct utmpx *utx)
981 # ifdef HAVE_ENDUTXENT
987 # else /* UTMPX_USE_LIBRARY */
989 /* write a utmp entry direct to the file */
991 utmpx_write_direct(struct logininfo *li, struct utmpx *utx)
993 logit("%s: not implemented!", __func__);
996 # endif /* UTMPX_USE_LIBRARY */
999 utmpx_perform_login(struct logininfo *li)
1003 construct_utmpx(li, &utx);
1004 # ifdef UTMPX_USE_LIBRARY
1005 if (!utmpx_write_library(li, &utx)) {
1006 logit("%s: utmp_write_library() failed", __func__);
1010 if (!utmpx_write_direct(li, &ut)) {
1011 logit("%s: utmp_write_direct() failed", __func__);
1020 utmpx_perform_logout(struct logininfo *li)
1024 construct_utmpx(li, &utx);
1025 # ifdef HAVE_ID_IN_UTMPX
1026 line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id));
1028 # ifdef HAVE_TYPE_IN_UTMPX
1029 utx.ut_type = DEAD_PROCESS;
1032 # ifdef UTMPX_USE_LIBRARY
1033 utmpx_write_library(li, &utx);
1035 utmpx_write_direct(li, &utx);
1041 utmpx_write_entry(struct logininfo *li)
1045 return (utmpx_perform_login(li));
1047 return (utmpx_perform_logout(li));
1049 logit("%s: invalid type field", __func__);
1053 #endif /* USE_UTMPX */
1057 ** Low-level wtmp functions
1063 * Write a wtmp entry direct to the end of the file
1064 * This is a slight modification of code in OpenBSD's logwtmp.c
1067 wtmp_write(struct logininfo *li, struct utmp *ut)
1072 if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
1073 logit("%s: problem writing %s: %s", __func__,
1074 WTMP_FILE, strerror(errno));
1077 if (fstat(fd, &buf) == 0)
1078 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
1079 ftruncate(fd, buf.st_size);
1080 logit("%s: problem writing %s: %s", __func__,
1081 WTMP_FILE, strerror(errno));
1089 wtmp_perform_login(struct logininfo *li)
1093 construct_utmp(li, &ut);
1094 return (wtmp_write(li, &ut));
1099 wtmp_perform_logout(struct logininfo *li)
1103 construct_utmp(li, &ut);
1104 return (wtmp_write(li, &ut));
1109 wtmp_write_entry(struct logininfo *li)
1113 return (wtmp_perform_login(li));
1115 return (wtmp_perform_logout(li));
1117 logit("%s: invalid type field", __func__);
1124 * Notes on fetching login data from wtmp/wtmpx
1126 * Logouts are usually recorded with (amongst other things) a blank
1127 * username on a given tty line. However, some systems (HP-UX is one)
1128 * leave all fields set, but change the ut_type field to DEAD_PROCESS.
1130 * Since we're only looking for logins here, we know that the username
1131 * must be set correctly. On systems that leave it in, we check for
1132 * ut_type==USER_PROCESS (indicating a login.)
1134 * Portability: Some systems may set something other than USER_PROCESS
1135 * to indicate a login process. I don't know of any as I write. Also,
1136 * it's possible that some systems may both leave the username in
1137 * place and not have ut_type.
1140 /* return true if this wtmp entry indicates a login */
1142 wtmp_islogin(struct logininfo *li, struct utmp *ut)
1144 if (strncmp(li->username, ut->ut_name,
1145 MIN_SIZEOF(li->username, ut->ut_name)) == 0) {
1146 # ifdef HAVE_TYPE_IN_UTMP
1147 if (ut->ut_type & USER_PROCESS)
1157 wtmp_get_entry(struct logininfo *li)
1163 /* Clear the time entries in our logininfo */
1164 li->tv_sec = li->tv_usec = 0;
1166 if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) {
1167 logit("%s: problem opening %s: %s", __func__,
1168 WTMP_FILE, strerror(errno));
1171 if (fstat(fd, &st) != 0) {
1172 logit("%s: couldn't stat %s: %s", __func__,
1173 WTMP_FILE, strerror(errno));
1178 /* Seek to the start of the last struct utmp */
1179 if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) {
1180 /* Looks like we've got a fresh wtmp file */
1186 if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) {
1187 logit("%s: read of %s failed: %s", __func__,
1188 WTMP_FILE, strerror(errno));
1192 if ( wtmp_islogin(li, &ut) ) {
1195 * We've already checked for a time in struct
1196 * utmp, in login_getlast()
1198 # ifdef HAVE_TIME_IN_UTMP
1199 li->tv_sec = ut.ut_time;
1201 # if HAVE_TV_IN_UTMP
1202 li->tv_sec = ut.ut_tv.tv_sec;
1205 line_fullname(li->line, ut.ut_line,
1206 MIN_SIZEOF(li->line, ut.ut_line));
1207 # ifdef HAVE_HOST_IN_UTMP
1208 strlcpy(li->hostname, ut.ut_host,
1209 MIN_SIZEOF(li->hostname, ut.ut_host));
1213 /* Seek back 2 x struct utmp */
1214 if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) {
1215 /* We've found the start of the file, so quit */
1221 /* We found an entry. Tidy up and return */
1225 # endif /* USE_WTMP */
1229 ** Low-level wtmpx functions
1234 * Write a wtmpx entry direct to the end of the file
1235 * This is a slight modification of code in OpenBSD's logwtmp.c
1238 wtmpx_write(struct logininfo *li, struct utmpx *utx)
1240 #ifndef HAVE_UPDWTMPX
1244 if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
1245 logit("%s: problem opening %s: %s", __func__,
1246 WTMPX_FILE, strerror(errno));
1250 if (fstat(fd, &buf) == 0)
1251 if (atomicio(vwrite, fd, utx, sizeof(*utx)) != sizeof(*utx)) {
1252 ftruncate(fd, buf.st_size);
1253 logit("%s: problem writing %s: %s", __func__,
1254 WTMPX_FILE, strerror(errno));
1261 updwtmpx(WTMPX_FILE, utx);
1268 wtmpx_perform_login(struct logininfo *li)
1272 construct_utmpx(li, &utx);
1273 return (wtmpx_write(li, &utx));
1278 wtmpx_perform_logout(struct logininfo *li)
1282 construct_utmpx(li, &utx);
1283 return (wtmpx_write(li, &utx));
1288 wtmpx_write_entry(struct logininfo *li)
1292 return (wtmpx_perform_login(li));
1294 return (wtmpx_perform_logout(li));
1296 logit("%s: invalid type field", __func__);
1301 /* Please see the notes above wtmp_islogin() for information about the
1302 next two functions */
1304 /* Return true if this wtmpx entry indicates a login */
1306 wtmpx_islogin(struct logininfo *li, struct utmpx *utx)
1308 if (strncmp(li->username, utx->ut_name,
1309 MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) {
1310 # ifdef HAVE_TYPE_IN_UTMPX
1311 if (utx->ut_type == USER_PROCESS)
1322 wtmpx_get_entry(struct logininfo *li)
1328 /* Clear the time entries */
1329 li->tv_sec = li->tv_usec = 0;
1331 if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) {
1332 logit("%s: problem opening %s: %s", __func__,
1333 WTMPX_FILE, strerror(errno));
1336 if (fstat(fd, &st) != 0) {
1337 logit("%s: couldn't stat %s: %s", __func__,
1338 WTMPX_FILE, strerror(errno));
1343 /* Seek to the start of the last struct utmpx */
1344 if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) {
1345 /* probably a newly rotated wtmpx file */
1351 if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) {
1352 logit("%s: read of %s failed: %s", __func__,
1353 WTMPX_FILE, strerror(errno));
1358 * Logouts are recorded as a blank username on a particular
1359 * line. So, we just need to find the username in struct utmpx
1361 if (wtmpx_islogin(li, &utx)) {
1363 # if defined(HAVE_TV_IN_UTMPX)
1364 li->tv_sec = utx.ut_tv.tv_sec;
1365 # elif defined(HAVE_TIME_IN_UTMPX)
1366 li->tv_sec = utx.ut_time;
1368 line_fullname(li->line, utx.ut_line, sizeof(li->line));
1369 # if defined(HAVE_HOST_IN_UTMPX)
1370 strlcpy(li->hostname, utx.ut_host,
1371 MIN_SIZEOF(li->hostname, utx.ut_host));
1375 if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) {
1384 #endif /* USE_WTMPX */
1387 ** Low-level libutil login() functions
1392 syslogin_perform_login(struct logininfo *li)
1396 ut = xmalloc(sizeof(*ut));
1397 construct_utmp(li, ut);
1405 syslogin_perform_logout(struct logininfo *li)
1408 char line[UT_LINESIZE];
1410 (void)line_stripname(line, li->line, sizeof(line));
1413 logit("%s: logout() returned an error", __func__);
1414 # ifdef HAVE_LOGWTMP
1416 logwtmp(line, "", "");
1418 /* FIXME: (ATL - if the need arises) What to do if we have
1419 * login, but no logout? what if logout but no logwtmp? All
1420 * routines are in libutil so they should all be there,
1427 syslogin_write_entry(struct logininfo *li)
1431 return (syslogin_perform_login(li));
1433 return (syslogin_perform_logout(li));
1435 logit("%s: Invalid type field", __func__);
1439 #endif /* USE_LOGIN */
1441 /* end of file log-syslogin.c */
1444 ** Low-level lastlog functions
1453 lastlog_construct(struct logininfo *li, struct lastlog *last)
1455 /* clear the structure */
1456 memset(last, '\0', sizeof(*last));
1458 line_stripname(last->ll_line, li->line, sizeof(last->ll_line));
1459 strlcpy(last->ll_host, li->hostname,
1460 MIN_SIZEOF(last->ll_host, li->hostname));
1461 last->ll_time = li->tv_sec;
1465 lastlog_filetype(char *filename)
1469 if (stat(LASTLOG_FILE, &st) != 0) {
1470 logit("%s: Couldn't stat %s: %s", __func__,
1471 LASTLOG_FILE, strerror(errno));
1474 if (S_ISDIR(st.st_mode))
1476 else if (S_ISREG(st.st_mode))
1483 /* open the file (using filemode) and seek to the login entry */
1485 lastlog_openseek(struct logininfo *li, int *fd, int filemode)
1489 char lastlog_file[1024];
1491 type = lastlog_filetype(LASTLOG_FILE);
1494 strlcpy(lastlog_file, LASTLOG_FILE,
1495 sizeof(lastlog_file));
1498 snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s",
1499 LASTLOG_FILE, li->username);
1502 logit("%s: %.100s is not a file or directory!", __func__,
1507 *fd = open(lastlog_file, filemode, 0600);
1509 debug("%s: Couldn't open %s: %s", __func__,
1510 lastlog_file, strerror(errno));
1514 if (type == LL_FILE) {
1515 /* find this uid's offset in the lastlog file */
1516 offset = (off_t) ((long)li->uid * sizeof(struct lastlog));
1518 if (lseek(*fd, offset, SEEK_SET) != offset) {
1519 logit("%s: %s->lseek(): %s", __func__,
1520 lastlog_file, strerror(errno));
1529 lastlog_perform_login(struct logininfo *li)
1531 struct lastlog last;
1534 /* create our struct lastlog */
1535 lastlog_construct(li, &last);
1537 if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT))
1540 /* write the entry */
1541 if (atomicio(vwrite, fd, &last, sizeof(last)) != sizeof(last)) {
1543 logit("%s: Error writing to %s: %s", __func__,
1544 LASTLOG_FILE, strerror(errno));
1553 lastlog_write_entry(struct logininfo *li)
1557 return (lastlog_perform_login(li));
1559 logit("%s: Invalid type field", __func__);
1565 lastlog_populate_entry(struct logininfo *li, struct lastlog *last)
1567 line_fullname(li->line, last->ll_line, sizeof(li->line));
1568 strlcpy(li->hostname, last->ll_host,
1569 MIN_SIZEOF(li->hostname, last->ll_host));
1570 li->tv_sec = last->ll_time;
1574 lastlog_get_entry(struct logininfo *li)
1576 struct lastlog last;
1579 if (!lastlog_openseek(li, &fd, O_RDONLY))
1582 ret = atomicio(read, fd, &last, sizeof(last));
1587 memset(&last, '\0', sizeof(last));
1590 lastlog_populate_entry(li, &last);
1593 error("%s: Error reading from %s: %s", __func__,
1594 LASTLOG_FILE, strerror(errno));
1597 error("%s: Error reading from %s: Expecting %d, got %d",
1598 __func__, LASTLOG_FILE, (int)sizeof(last), ret);
1605 #endif /* USE_LASTLOG */
1609 * Logs failed login attempts in _PATH_BTMP if that exists.
1610 * The most common login failure is to give password instead of username.
1611 * So the _PATH_BTMP file checked for the correct permission, so that
1612 * only root can read it.
1616 record_failed_login(const char *username, const char *hostname,
1621 struct sockaddr_storage from;
1622 socklen_t fromlen = sizeof(from);
1623 struct sockaddr_in *a4;
1624 struct sockaddr_in6 *a6;
1630 if ((fd = open(_PATH_BTMP, O_WRONLY | O_APPEND)) < 0) {
1631 debug("Unable to open the btmp file %s: %s", _PATH_BTMP,
1635 if (fstat(fd, &fst) < 0) {
1636 logit("%s: fstat of %s failed: %s", __func__, _PATH_BTMP,
1640 if((fst.st_mode & (S_IRWXG | S_IRWXO)) || (fst.st_uid != 0)){
1641 logit("Excess permission or bad ownership on file %s",
1646 memset(&ut, 0, sizeof(ut));
1647 /* strncpy because we don't necessarily want nul termination */
1648 strncpy(ut.ut_user, username, sizeof(ut.ut_user));
1649 strlcpy(ut.ut_line, "ssh:notty", sizeof(ut.ut_line));
1652 ut.ut_time = t; /* ut_time is not always a time_t */
1653 ut.ut_type = LOGIN_PROCESS;
1654 ut.ut_pid = getpid();
1656 /* strncpy because we don't necessarily want nul termination */
1657 strncpy(ut.ut_host, hostname, sizeof(ut.ut_host));
1659 if (packet_connection_is_on_socket() &&
1660 getpeername(packet_get_connection_in(),
1661 (struct sockaddr *)&from, &fromlen) == 0) {
1662 ipv64_normalise_mapped(&from, &fromlen);
1663 if (from.ss_family == AF_INET) {
1664 a4 = (struct sockaddr_in *)&from;
1665 memcpy(&ut.ut_addr, &(a4->sin_addr),
1666 MIN_SIZEOF(ut.ut_addr, a4->sin_addr));
1668 #ifdef HAVE_ADDR_V6_IN_UTMP
1669 if (from.ss_family == AF_INET6) {
1670 a6 = (struct sockaddr_in6 *)&from;
1671 memcpy(&ut.ut_addr_v6, &(a6->sin6_addr),
1672 MIN_SIZEOF(ut.ut_addr_v6, a6->sin6_addr));
1677 if (atomicio(vwrite, fd, &ut, sizeof(ut)) != sizeof(ut))
1678 error("Failed to write to %s: %s", _PATH_BTMP,
1684 #endif /* USE_BTMP */