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>
166 #include "hostfile.h"
168 #include "loginrec.h"
170 #include "atomicio.h"
172 #include "canohost.h"
180 #ifdef HAVE_LIBUTIL_H
181 # include <libutil.h>
185 ** prototypes for helper functions in this file
189 void set_utmp_time(struct logininfo *li, struct utmp *ut);
190 void construct_utmp(struct logininfo *li, struct utmp *ut);
194 void set_utmpx_time(struct logininfo *li, struct utmpx *ut);
195 void construct_utmpx(struct logininfo *li, struct utmpx *ut);
198 int utmp_write_entry(struct logininfo *li);
199 int utmpx_write_entry(struct logininfo *li);
200 int wtmp_write_entry(struct logininfo *li);
201 int wtmpx_write_entry(struct logininfo *li);
202 int lastlog_write_entry(struct logininfo *li);
203 int syslogin_write_entry(struct logininfo *li);
205 int getlast_entry(struct logininfo *li);
206 int lastlog_get_entry(struct logininfo *li);
207 int wtmp_get_entry(struct logininfo *li);
208 int wtmpx_get_entry(struct logininfo *li);
210 extern Buffer loginmsg;
212 /* pick the shortest string */
213 #define MIN_SIZEOF(s1,s2) (sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2))
216 ** platform-independent login functions
220 * login_login(struct logininfo *) - Record a login
222 * Call with a pointer to a struct logininfo initialised with
223 * login_init_entry() or login_alloc_entry()
227 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
230 login_login(struct logininfo *li)
232 li->type = LTYPE_LOGIN;
233 return (login_write(li));
238 * login_logout(struct logininfo *) - Record a logout
240 * Call as with login_login()
244 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
247 login_logout(struct logininfo *li)
249 li->type = LTYPE_LOGOUT;
250 return (login_write(li));
254 * login_get_lastlog_time(int) - Retrieve the last login time
256 * Retrieve the last login time for the given uid. Will try to use the
257 * system lastlog facilities if they are available, but will fall back
258 * to looking in wtmp/wtmpx if necessary
261 * 0 on failure, or if user has never logged in
262 * Time in seconds from the epoch if successful
264 * Useful preprocessor symbols:
265 * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog
267 * USE_LASTLOG: If set, indicates the presence of system lastlog
268 * facilities. If this and DISABLE_LASTLOG are not set,
269 * try to retrieve lastlog information from wtmp/wtmpx.
272 login_get_lastlog_time(const int uid)
276 if (login_get_lastlog(&li, uid))
283 * login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry
285 * Retrieve a logininfo structure populated (only partially) with
286 * information from the system lastlog data, or from wtmp/wtmpx if no
287 * system lastlog information exists.
289 * Note this routine must be given a pre-allocated logininfo.
292 * >0: A pointer to your struct logininfo if successful
293 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
296 login_get_lastlog(struct logininfo *li, const int uid)
300 memset(li, '\0', sizeof(*li));
304 * If we don't have a 'real' lastlog, we need the username to
305 * reliably search wtmp(x) for the last login (see
310 fatal("%s: Cannot find account for uid %i", __func__, uid);
312 /* No MIN_SIZEOF here - we absolutely *must not* truncate the
313 * username (XXX - so check for trunc!) */
314 strlcpy(li->username, pw->pw_name, sizeof(li->username));
316 if (getlast_entry(li))
324 * login_alloc_entry(int, char*, char*, char*) - Allocate and initialise
325 * a logininfo structure
327 * This function creates a new struct logininfo, a data structure
328 * meant to carry the information required to portably record login info.
330 * Returns a pointer to a newly created struct logininfo. If memory
331 * allocation fails, the program halts.
334 logininfo *login_alloc_entry(int pid, const char *username,
335 const char *hostname, const char *line)
337 struct logininfo *newli;
339 newli = xmalloc(sizeof(*newli));
340 login_init_entry(newli, pid, username, hostname, line);
345 /* login_free_entry(struct logininfo *) - free struct memory */
347 login_free_entry(struct logininfo *li)
353 /* login_init_entry(struct logininfo *, int, char*, char*, char*)
354 * - initialise a struct logininfo
356 * Populates a new struct logininfo, a data structure meant to carry
357 * the information required to portably record login info.
362 login_init_entry(struct logininfo *li, int pid, const char *username,
363 const char *hostname, const char *line)
367 memset(li, 0, sizeof(*li));
371 /* set the line information */
373 line_fullname(li->line, line, sizeof(li->line));
376 strlcpy(li->username, username, sizeof(li->username));
377 pw = getpwnam(li->username);
379 fatal("%s: Cannot find user \"%s\"", __func__,
382 li->uid = pw->pw_uid;
386 strlcpy(li->hostname, hostname, sizeof(li->hostname));
392 * login_set_current_time(struct logininfo *) - set the current time
394 * Set the current time in a logininfo structure. This function is
395 * meant to eliminate the need to deal with system dependencies for
399 login_set_current_time(struct logininfo *li)
403 gettimeofday(&tv, NULL);
405 li->tv_sec = tv.tv_sec;
406 li->tv_usec = tv.tv_usec;
409 /* copy a sockaddr_* into our logininfo */
411 login_set_addr(struct logininfo *li, const struct sockaddr *sa,
412 const unsigned int sa_size)
414 unsigned int bufsize = sa_size;
416 /* make sure we don't overrun our union */
417 if (sizeof(li->hostaddr) < sa_size)
418 bufsize = sizeof(li->hostaddr);
420 memcpy(&li->hostaddr.sa, sa, bufsize);
425 ** login_write: Call low-level recording functions based on autoconf
429 login_write(struct logininfo *li)
432 if (geteuid() != 0) {
433 logit("Attempt to write login records by non-root user (aborting)");
438 /* set the timestamp */
439 login_set_current_time(li);
441 syslogin_write_entry(li);
444 if (li->type == LTYPE_LOGIN)
445 lastlog_write_entry(li);
448 utmp_write_entry(li);
451 wtmp_write_entry(li);
454 utmpx_write_entry(li);
457 wtmpx_write_entry(li);
459 #ifdef CUSTOM_SYS_AUTH_RECORD_LOGIN
460 if (li->type == LTYPE_LOGIN &&
461 !sys_auth_record_login(li->username,li->hostname,li->line,
463 logit("Writing login record failed for %s", li->username);
465 #ifdef SSH_AUDIT_EVENTS
466 if (li->type == LTYPE_LOGIN)
467 audit_session_open(li->line);
468 else if (li->type == LTYPE_LOGOUT)
469 audit_session_close(li->line);
474 #ifdef LOGIN_NEEDS_UTMPX
476 login_utmp_only(struct logininfo *li)
478 li->type = LTYPE_LOGIN;
479 login_set_current_time(li);
481 utmp_write_entry(li);
484 wtmp_write_entry(li);
487 utmpx_write_entry(li);
490 wtmpx_write_entry(li);
497 ** getlast_entry: Call low-level functions to retrieve the last login
501 /* take the uid in li and return the last login time */
503 getlast_entry(struct logininfo *li)
506 return(lastlog_get_entry(li));
507 #else /* !USE_LASTLOG */
509 #if defined(DISABLE_LASTLOG)
510 /* On some systems we shouldn't even try to obtain last login
513 # elif defined(USE_WTMP) && \
514 (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP))
515 /* retrieve last login time from utmp */
516 return (wtmp_get_entry(li));
517 # elif defined(USE_WTMPX) && \
518 (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX))
519 /* If wtmp isn't available, try wtmpx */
520 return (wtmpx_get_entry(li));
522 /* Give up: No means of retrieving last login time */
524 # endif /* DISABLE_LASTLOG */
525 #endif /* USE_LASTLOG */
531 * 'line' string utility functions
533 * These functions process the 'line' string into one of three forms:
535 * 1. The full filename (including '/dev')
536 * 2. The stripped name (excluding '/dev')
537 * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00
538 * /dev/pts/1 -> ts/1 )
540 * Form 3 is used on some systems to identify a .tmp.? entry when
541 * attempting to remove it. Typically both addition and removal is
542 * performed by one application - say, sshd - so as long as the choice
543 * uniquely identifies a terminal it's ok.
548 * line_fullname(): add the leading '/dev/' if it doesn't exist make
549 * sure dst has enough space, if not just copy src (ugh)
552 line_fullname(char *dst, const char *src, u_int dstsize)
554 memset(dst, '\0', dstsize);
555 if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5)))
556 strlcpy(dst, src, dstsize);
558 strlcpy(dst, "/dev/", dstsize);
559 strlcat(dst, src, dstsize);
564 /* line_stripname(): strip the leading '/dev' if it exists, return dst */
566 line_stripname(char *dst, const char *src, int dstsize)
568 memset(dst, '\0', dstsize);
569 if (strncmp(src, "/dev/", 5) == 0)
570 strlcpy(dst, src + 5, dstsize);
572 strlcpy(dst, src, dstsize);
577 * line_abbrevname(): Return the abbreviated (usually four-character)
578 * form of the line (Just use the last <dstsize> characters of the
581 * NOTE: use strncpy because we do NOT necessarily want zero
585 line_abbrevname(char *dst, const char *src, int dstsize)
589 memset(dst, '\0', dstsize);
591 /* Always skip prefix if present */
592 if (strncmp(src, "/dev/", 5) == 0)
595 #ifdef WITH_ABBREV_NO_TTY
596 if (strncmp(src, "tty", 3) == 0)
603 if (((int)len - dstsize) > 0)
604 src += ((int)len - dstsize);
606 /* note: _don't_ change this to strlcpy */
607 strncpy(dst, src, (size_t)dstsize);
614 ** utmp utility functions
616 ** These functions manipulate struct utmp, taking system differences
620 #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN)
622 /* build the utmp structure */
624 set_utmp_time(struct logininfo *li, struct utmp *ut)
626 # if defined(HAVE_TV_IN_UTMP)
627 ut->ut_tv.tv_sec = li->tv_sec;
628 ut->ut_tv.tv_usec = li->tv_usec;
629 # elif defined(HAVE_TIME_IN_UTMP)
630 ut->ut_time = li->tv_sec;
635 construct_utmp(struct logininfo *li,
638 # ifdef HAVE_ADDR_V6_IN_UTMP
639 struct sockaddr_in6 *sa6;
642 memset(ut, '\0', sizeof(*ut));
644 /* First fill out fields used for both logins and logouts */
646 # ifdef HAVE_ID_IN_UTMP
647 line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id));
650 # ifdef HAVE_TYPE_IN_UTMP
651 /* This is done here to keep utmp constants out of struct logininfo */
654 ut->ut_type = USER_PROCESS;
660 ut->ut_type = DEAD_PROCESS;
662 cray_retain_utmp(ut, li->pid);
667 set_utmp_time(li, ut);
669 line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line));
671 # ifdef HAVE_PID_IN_UTMP
672 ut->ut_pid = li->pid;
675 /* If we're logging out, leave all other fields blank */
676 if (li->type == LTYPE_LOGOUT)
680 * These fields are only used when logging in, and are blank
684 /* Use strncpy because we don't necessarily want null termination */
685 strncpy(ut->ut_name, li->username,
686 MIN_SIZEOF(ut->ut_name, li->username));
687 # ifdef HAVE_HOST_IN_UTMP
688 strncpy(ut->ut_host, li->hostname,
689 MIN_SIZEOF(ut->ut_host, li->hostname));
691 # ifdef HAVE_ADDR_IN_UTMP
692 /* this is just a 32-bit IP address */
693 if (li->hostaddr.sa.sa_family == AF_INET)
694 ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
696 # ifdef HAVE_ADDR_V6_IN_UTMP
697 /* this is just a 128-bit IPv6 address */
698 if (li->hostaddr.sa.sa_family == AF_INET6) {
699 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa);
700 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16);
701 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
702 ut->ut_addr_v6[0] = ut->ut_addr_v6[3];
703 ut->ut_addr_v6[1] = 0;
704 ut->ut_addr_v6[2] = 0;
705 ut->ut_addr_v6[3] = 0;
710 #endif /* USE_UTMP || USE_WTMP || USE_LOGIN */
713 ** utmpx utility functions
715 ** These functions manipulate struct utmpx, accounting for system
719 #if defined(USE_UTMPX) || defined (USE_WTMPX)
720 /* build the utmpx structure */
722 set_utmpx_time(struct logininfo *li, struct utmpx *utx)
724 # if defined(HAVE_TV_IN_UTMPX)
725 utx->ut_tv.tv_sec = li->tv_sec;
726 utx->ut_tv.tv_usec = li->tv_usec;
727 # elif defined(HAVE_TIME_IN_UTMPX)
728 utx->ut_time = li->tv_sec;
733 construct_utmpx(struct logininfo *li, struct utmpx *utx)
735 # ifdef HAVE_ADDR_V6_IN_UTMP
736 struct sockaddr_in6 *sa6;
738 memset(utx, '\0', sizeof(*utx));
740 # ifdef HAVE_ID_IN_UTMPX
741 line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id));
744 /* this is done here to keep utmp constants out of loginrec.h */
747 utx->ut_type = USER_PROCESS;
750 utx->ut_type = DEAD_PROCESS;
753 line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line));
754 set_utmpx_time(li, utx);
755 utx->ut_pid = li->pid;
757 /* strncpy(): Don't necessarily want null termination */
758 strncpy(utx->ut_name, li->username,
759 MIN_SIZEOF(utx->ut_name, li->username));
761 if (li->type == LTYPE_LOGOUT)
765 * These fields are only used when logging in, and are blank
769 # ifdef HAVE_HOST_IN_UTMPX
770 strncpy(utx->ut_host, li->hostname,
771 MIN_SIZEOF(utx->ut_host, li->hostname));
773 # ifdef HAVE_ADDR_IN_UTMPX
774 /* this is just a 32-bit IP address */
775 if (li->hostaddr.sa.sa_family == AF_INET)
776 utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
778 # ifdef HAVE_ADDR_V6_IN_UTMP
779 /* this is just a 128-bit IPv6 address */
780 if (li->hostaddr.sa.sa_family == AF_INET6) {
781 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa);
782 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16);
783 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
784 ut->ut_addr_v6[0] = ut->ut_addr_v6[3];
785 ut->ut_addr_v6[1] = 0;
786 ut->ut_addr_v6[2] = 0;
787 ut->ut_addr_v6[3] = 0;
791 # ifdef HAVE_SYSLEN_IN_UTMPX
792 /* ut_syslen is the length of the utx_host string */
793 utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host));
796 #endif /* USE_UTMPX || USE_WTMPX */
799 ** Low-level utmp functions
802 /* FIXME: (ATL) utmp_write_direct needs testing */
805 /* if we can, use pututline() etc. */
806 # if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \
807 defined(HAVE_PUTUTLINE)
808 # define UTMP_USE_LIBRARY
812 /* write a utmp entry with the system's help (pututline() and pals) */
813 # ifdef UTMP_USE_LIBRARY
815 utmp_write_library(struct logininfo *li, struct utmp *ut)
819 # ifdef HAVE_ENDUTENT
824 # else /* UTMP_USE_LIBRARY */
827 * Write a utmp entry direct to the file
828 * This is a slightly modification of code in OpenBSD's login.c
831 utmp_write_direct(struct logininfo *li, struct utmp *ut)
837 /* FIXME: (ATL) ttyslot() needs local implementation */
839 #if defined(HAVE_GETTTYENT)
844 while (NULL != (ty = getttyent())) {
846 if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line)))
852 logit("%s: tty not found", __func__);
857 tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */
859 #endif /* HAVE_GETTTYENT */
861 if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) {
864 pos = (off_t)tty * sizeof(struct utmp);
865 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) {
866 logit("%s: lseek: %s", __func__, strerror(errno));
870 logit("%s: Couldn't seek to tty %d slot in %s",
871 __func__, tty, UTMP_FILE);
875 * Prevent luser from zero'ing out ut_host.
876 * If the new ut_line is empty but the old one is not
877 * and ut_line and ut_name match, preserve the old ut_line.
879 if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) &&
880 (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') &&
881 (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) &&
882 (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0))
883 memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host));
885 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) {
886 logit("%s: lseek: %s", __func__, strerror(errno));
890 logit("%s: Couldn't seek to tty %d slot in %s",
891 __func__, tty, UTMP_FILE);
894 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
895 logit("%s: error writing %s: %s", __func__,
896 UTMP_FILE, strerror(errno));
905 # endif /* UTMP_USE_LIBRARY */
908 utmp_perform_login(struct logininfo *li)
912 construct_utmp(li, &ut);
913 # ifdef UTMP_USE_LIBRARY
914 if (!utmp_write_library(li, &ut)) {
915 logit("%s: utmp_write_library() failed", __func__);
919 if (!utmp_write_direct(li, &ut)) {
920 logit("%s: utmp_write_direct() failed", __func__);
929 utmp_perform_logout(struct logininfo *li)
933 construct_utmp(li, &ut);
934 # ifdef UTMP_USE_LIBRARY
935 if (!utmp_write_library(li, &ut)) {
936 logit("%s: utmp_write_library() failed", __func__);
940 if (!utmp_write_direct(li, &ut)) {
941 logit("%s: utmp_write_direct() failed", __func__);
950 utmp_write_entry(struct logininfo *li)
954 return (utmp_perform_login(li));
957 return (utmp_perform_logout(li));
960 logit("%s: invalid type field", __func__);
964 #endif /* USE_UTMP */
968 ** Low-level utmpx functions
971 /* not much point if we don't want utmpx entries */
974 /* if we have the wherewithall, use pututxline etc. */
975 # if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \
976 defined(HAVE_PUTUTXLINE)
977 # define UTMPX_USE_LIBRARY
981 /* write a utmpx entry with the system's help (pututxline() and pals) */
982 # ifdef UTMPX_USE_LIBRARY
984 utmpx_write_library(struct logininfo *li, struct utmpx *utx)
989 # ifdef HAVE_ENDUTXENT
995 # else /* UTMPX_USE_LIBRARY */
997 /* write a utmp entry direct to the file */
999 utmpx_write_direct(struct logininfo *li, struct utmpx *utx)
1001 logit("%s: not implemented!", __func__);
1004 # endif /* UTMPX_USE_LIBRARY */
1007 utmpx_perform_login(struct logininfo *li)
1011 construct_utmpx(li, &utx);
1012 # ifdef UTMPX_USE_LIBRARY
1013 if (!utmpx_write_library(li, &utx)) {
1014 logit("%s: utmp_write_library() failed", __func__);
1018 if (!utmpx_write_direct(li, &ut)) {
1019 logit("%s: utmp_write_direct() failed", __func__);
1028 utmpx_perform_logout(struct logininfo *li)
1032 construct_utmpx(li, &utx);
1033 # ifdef HAVE_ID_IN_UTMPX
1034 line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id));
1036 # ifdef HAVE_TYPE_IN_UTMPX
1037 utx.ut_type = DEAD_PROCESS;
1040 # ifdef UTMPX_USE_LIBRARY
1041 utmpx_write_library(li, &utx);
1043 utmpx_write_direct(li, &utx);
1049 utmpx_write_entry(struct logininfo *li)
1053 return (utmpx_perform_login(li));
1055 return (utmpx_perform_logout(li));
1057 logit("%s: invalid type field", __func__);
1061 #endif /* USE_UTMPX */
1065 ** Low-level wtmp functions
1071 * Write a wtmp entry direct to the end of the file
1072 * This is a slight modification of code in OpenBSD's logwtmp.c
1075 wtmp_write(struct logininfo *li, struct utmp *ut)
1080 if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
1081 logit("%s: problem writing %s: %s", __func__,
1082 WTMP_FILE, strerror(errno));
1085 if (fstat(fd, &buf) == 0)
1086 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
1087 ftruncate(fd, buf.st_size);
1088 logit("%s: problem writing %s: %s", __func__,
1089 WTMP_FILE, strerror(errno));
1097 wtmp_perform_login(struct logininfo *li)
1101 construct_utmp(li, &ut);
1102 return (wtmp_write(li, &ut));
1107 wtmp_perform_logout(struct logininfo *li)
1111 construct_utmp(li, &ut);
1112 return (wtmp_write(li, &ut));
1117 wtmp_write_entry(struct logininfo *li)
1121 return (wtmp_perform_login(li));
1123 return (wtmp_perform_logout(li));
1125 logit("%s: invalid type field", __func__);
1132 * Notes on fetching login data from wtmp/wtmpx
1134 * Logouts are usually recorded with (amongst other things) a blank
1135 * username on a given tty line. However, some systems (HP-UX is one)
1136 * leave all fields set, but change the ut_type field to DEAD_PROCESS.
1138 * Since we're only looking for logins here, we know that the username
1139 * must be set correctly. On systems that leave it in, we check for
1140 * ut_type==USER_PROCESS (indicating a login.)
1142 * Portability: Some systems may set something other than USER_PROCESS
1143 * to indicate a login process. I don't know of any as I write. Also,
1144 * it's possible that some systems may both leave the username in
1145 * place and not have ut_type.
1148 /* return true if this wtmp entry indicates a login */
1150 wtmp_islogin(struct logininfo *li, struct utmp *ut)
1152 if (strncmp(li->username, ut->ut_name,
1153 MIN_SIZEOF(li->username, ut->ut_name)) == 0) {
1154 # ifdef HAVE_TYPE_IN_UTMP
1155 if (ut->ut_type & USER_PROCESS)
1165 wtmp_get_entry(struct logininfo *li)
1171 /* Clear the time entries in our logininfo */
1172 li->tv_sec = li->tv_usec = 0;
1174 if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) {
1175 logit("%s: problem opening %s: %s", __func__,
1176 WTMP_FILE, strerror(errno));
1179 if (fstat(fd, &st) != 0) {
1180 logit("%s: couldn't stat %s: %s", __func__,
1181 WTMP_FILE, strerror(errno));
1186 /* Seek to the start of the last struct utmp */
1187 if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) {
1188 /* Looks like we've got a fresh wtmp file */
1194 if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) {
1195 logit("%s: read of %s failed: %s", __func__,
1196 WTMP_FILE, strerror(errno));
1200 if ( wtmp_islogin(li, &ut) ) {
1203 * We've already checked for a time in struct
1204 * utmp, in login_getlast()
1206 # ifdef HAVE_TIME_IN_UTMP
1207 li->tv_sec = ut.ut_time;
1209 # if HAVE_TV_IN_UTMP
1210 li->tv_sec = ut.ut_tv.tv_sec;
1213 line_fullname(li->line, ut.ut_line,
1214 MIN_SIZEOF(li->line, ut.ut_line));
1215 # ifdef HAVE_HOST_IN_UTMP
1216 strlcpy(li->hostname, ut.ut_host,
1217 MIN_SIZEOF(li->hostname, ut.ut_host));
1221 /* Seek back 2 x struct utmp */
1222 if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) {
1223 /* We've found the start of the file, so quit */
1229 /* We found an entry. Tidy up and return */
1233 # endif /* USE_WTMP */
1237 ** Low-level wtmpx functions
1242 * Write a wtmpx entry direct to the end of the file
1243 * This is a slight modification of code in OpenBSD's logwtmp.c
1246 wtmpx_write(struct logininfo *li, struct utmpx *utx)
1248 #ifndef HAVE_UPDWTMPX
1252 if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
1253 logit("%s: problem opening %s: %s", __func__,
1254 WTMPX_FILE, strerror(errno));
1258 if (fstat(fd, &buf) == 0)
1259 if (atomicio(vwrite, fd, utx, sizeof(*utx)) != sizeof(*utx)) {
1260 ftruncate(fd, buf.st_size);
1261 logit("%s: problem writing %s: %s", __func__,
1262 WTMPX_FILE, strerror(errno));
1269 updwtmpx(WTMPX_FILE, utx);
1276 wtmpx_perform_login(struct logininfo *li)
1280 construct_utmpx(li, &utx);
1281 return (wtmpx_write(li, &utx));
1286 wtmpx_perform_logout(struct logininfo *li)
1290 construct_utmpx(li, &utx);
1291 return (wtmpx_write(li, &utx));
1296 wtmpx_write_entry(struct logininfo *li)
1300 return (wtmpx_perform_login(li));
1302 return (wtmpx_perform_logout(li));
1304 logit("%s: invalid type field", __func__);
1309 /* Please see the notes above wtmp_islogin() for information about the
1310 next two functions */
1312 /* Return true if this wtmpx entry indicates a login */
1314 wtmpx_islogin(struct logininfo *li, struct utmpx *utx)
1316 if (strncmp(li->username, utx->ut_name,
1317 MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) {
1318 # ifdef HAVE_TYPE_IN_UTMPX
1319 if (utx->ut_type == USER_PROCESS)
1330 wtmpx_get_entry(struct logininfo *li)
1336 /* Clear the time entries */
1337 li->tv_sec = li->tv_usec = 0;
1339 if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) {
1340 logit("%s: problem opening %s: %s", __func__,
1341 WTMPX_FILE, strerror(errno));
1344 if (fstat(fd, &st) != 0) {
1345 logit("%s: couldn't stat %s: %s", __func__,
1346 WTMPX_FILE, strerror(errno));
1351 /* Seek to the start of the last struct utmpx */
1352 if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) {
1353 /* probably a newly rotated wtmpx file */
1359 if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) {
1360 logit("%s: read of %s failed: %s", __func__,
1361 WTMPX_FILE, strerror(errno));
1366 * Logouts are recorded as a blank username on a particular
1367 * line. So, we just need to find the username in struct utmpx
1369 if (wtmpx_islogin(li, &utx)) {
1371 # if defined(HAVE_TV_IN_UTMPX)
1372 li->tv_sec = utx.ut_tv.tv_sec;
1373 # elif defined(HAVE_TIME_IN_UTMPX)
1374 li->tv_sec = utx.ut_time;
1376 line_fullname(li->line, utx.ut_line, sizeof(li->line));
1377 # if defined(HAVE_HOST_IN_UTMPX)
1378 strlcpy(li->hostname, utx.ut_host,
1379 MIN_SIZEOF(li->hostname, utx.ut_host));
1383 if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) {
1392 #endif /* USE_WTMPX */
1395 ** Low-level libutil login() functions
1400 syslogin_perform_login(struct logininfo *li)
1404 ut = xmalloc(sizeof(*ut));
1405 construct_utmp(li, ut);
1413 syslogin_perform_logout(struct logininfo *li)
1416 char line[UT_LINESIZE];
1418 (void)line_stripname(line, li->line, sizeof(line));
1421 logit("%s: logout() returned an error", __func__);
1422 # ifdef HAVE_LOGWTMP
1424 logwtmp(line, "", "");
1426 /* FIXME: (ATL - if the need arises) What to do if we have
1427 * login, but no logout? what if logout but no logwtmp? All
1428 * routines are in libutil so they should all be there,
1435 syslogin_write_entry(struct logininfo *li)
1439 return (syslogin_perform_login(li));
1441 return (syslogin_perform_logout(li));
1443 logit("%s: Invalid type field", __func__);
1447 #endif /* USE_LOGIN */
1449 /* end of file log-syslogin.c */
1452 ** Low-level lastlog functions
1461 lastlog_construct(struct logininfo *li, struct lastlog *last)
1463 /* clear the structure */
1464 memset(last, '\0', sizeof(*last));
1466 line_stripname(last->ll_line, li->line, sizeof(last->ll_line));
1467 strlcpy(last->ll_host, li->hostname,
1468 MIN_SIZEOF(last->ll_host, li->hostname));
1469 last->ll_time = li->tv_sec;
1473 lastlog_filetype(char *filename)
1477 if (stat(LASTLOG_FILE, &st) != 0) {
1478 logit("%s: Couldn't stat %s: %s", __func__,
1479 LASTLOG_FILE, strerror(errno));
1482 if (S_ISDIR(st.st_mode))
1484 else if (S_ISREG(st.st_mode))
1491 /* open the file (using filemode) and seek to the login entry */
1493 lastlog_openseek(struct logininfo *li, int *fd, int filemode)
1497 char lastlog_file[1024];
1499 type = lastlog_filetype(LASTLOG_FILE);
1502 strlcpy(lastlog_file, LASTLOG_FILE,
1503 sizeof(lastlog_file));
1506 snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s",
1507 LASTLOG_FILE, li->username);
1510 logit("%s: %.100s is not a file or directory!", __func__,
1515 *fd = open(lastlog_file, filemode, 0600);
1517 debug("%s: Couldn't open %s: %s", __func__,
1518 lastlog_file, strerror(errno));
1522 if (type == LL_FILE) {
1523 /* find this uid's offset in the lastlog file */
1524 offset = (off_t) ((long)li->uid * sizeof(struct lastlog));
1526 if (lseek(*fd, offset, SEEK_SET) != offset) {
1527 logit("%s: %s->lseek(): %s", __func__,
1528 lastlog_file, strerror(errno));
1537 lastlog_perform_login(struct logininfo *li)
1539 struct lastlog last;
1542 /* create our struct lastlog */
1543 lastlog_construct(li, &last);
1545 if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT))
1548 /* write the entry */
1549 if (atomicio(vwrite, fd, &last, sizeof(last)) != sizeof(last)) {
1551 logit("%s: Error writing to %s: %s", __func__,
1552 LASTLOG_FILE, strerror(errno));
1561 lastlog_write_entry(struct logininfo *li)
1565 return (lastlog_perform_login(li));
1567 logit("%s: Invalid type field", __func__);
1573 lastlog_populate_entry(struct logininfo *li, struct lastlog *last)
1575 line_fullname(li->line, last->ll_line, sizeof(li->line));
1576 strlcpy(li->hostname, last->ll_host,
1577 MIN_SIZEOF(li->hostname, last->ll_host));
1578 li->tv_sec = last->ll_time;
1582 lastlog_get_entry(struct logininfo *li)
1584 struct lastlog last;
1587 if (!lastlog_openseek(li, &fd, O_RDONLY))
1590 ret = atomicio(read, fd, &last, sizeof(last));
1595 memset(&last, '\0', sizeof(last));
1598 lastlog_populate_entry(li, &last);
1601 error("%s: Error reading from %s: %s", __func__,
1602 LASTLOG_FILE, strerror(errno));
1605 error("%s: Error reading from %s: Expecting %d, got %d",
1606 __func__, LASTLOG_FILE, (int)sizeof(last), ret);
1613 #endif /* USE_LASTLOG */
1617 * Logs failed login attempts in _PATH_BTMP if that exists.
1618 * The most common login failure is to give password instead of username.
1619 * So the _PATH_BTMP file checked for the correct permission, so that
1620 * only root can read it.
1624 record_failed_login(const char *username, const char *hostname,
1629 struct sockaddr_storage from;
1630 socklen_t fromlen = sizeof(from);
1631 struct sockaddr_in *a4;
1632 struct sockaddr_in6 *a6;
1638 if ((fd = open(_PATH_BTMP, O_WRONLY | O_APPEND)) < 0) {
1639 debug("Unable to open the btmp file %s: %s", _PATH_BTMP,
1643 if (fstat(fd, &fst) < 0) {
1644 logit("%s: fstat of %s failed: %s", __func__, _PATH_BTMP,
1648 if((fst.st_mode & (S_IRWXG | S_IRWXO)) || (fst.st_uid != 0)){
1649 logit("Excess permission or bad ownership on file %s",
1654 memset(&ut, 0, sizeof(ut));
1655 /* strncpy because we don't necessarily want nul termination */
1656 strncpy(ut.ut_user, username, sizeof(ut.ut_user));
1657 strlcpy(ut.ut_line, "ssh:notty", sizeof(ut.ut_line));
1660 ut.ut_time = t; /* ut_time is not always a time_t */
1661 ut.ut_type = LOGIN_PROCESS;
1662 ut.ut_pid = getpid();
1664 /* strncpy because we don't necessarily want nul termination */
1665 strncpy(ut.ut_host, hostname, sizeof(ut.ut_host));
1667 if (packet_connection_is_on_socket() &&
1668 getpeername(packet_get_connection_in(),
1669 (struct sockaddr *)&from, &fromlen) == 0) {
1670 ipv64_normalise_mapped(&from, &fromlen);
1671 if (from.ss_family == AF_INET) {
1672 a4 = (struct sockaddr_in *)&from;
1673 memcpy(&ut.ut_addr, &(a4->sin_addr),
1674 MIN_SIZEOF(ut.ut_addr, a4->sin_addr));
1676 #ifdef HAVE_ADDR_V6_IN_UTMP
1677 if (from.ss_family == AF_INET6) {
1678 a6 = (struct sockaddr_in6 *)&from;
1679 memcpy(&ut.ut_addr_v6, &(a6->sin6_addr),
1680 MIN_SIZEOF(ut.ut_addr_v6, a6->sin6_addr));
1685 if (atomicio(vwrite, fd, &ut, sizeof(ut)) != sizeof(ut))
1686 error("Failed to write to %s: %s", _PATH_BTMP,
1692 #endif /* USE_BTMP */