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"
149 __RCSID("$FreeBSD$");
151 #include <sys/types.h>
152 #include <sys/stat.h>
153 #include <sys/socket.h>
155 #include <netinet/in.h>
170 #include "hostfile.h"
172 #include "loginrec.h"
174 #include "atomicio.h"
176 #include "canohost.h"
184 #ifdef HAVE_LIBUTIL_H
185 # include <libutil.h>
189 ** prototypes for helper functions in this file
193 void set_utmp_time(struct logininfo *li, struct utmp *ut);
194 void construct_utmp(struct logininfo *li, struct utmp *ut);
198 void set_utmpx_time(struct logininfo *li, struct utmpx *ut);
199 void construct_utmpx(struct logininfo *li, struct utmpx *ut);
202 int utmp_write_entry(struct logininfo *li);
203 int utmpx_write_entry(struct logininfo *li);
204 int wtmp_write_entry(struct logininfo *li);
205 int wtmpx_write_entry(struct logininfo *li);
206 int lastlog_write_entry(struct logininfo *li);
207 int syslogin_write_entry(struct logininfo *li);
209 int getlast_entry(struct logininfo *li);
210 int lastlog_get_entry(struct logininfo *li);
211 int wtmp_get_entry(struct logininfo *li);
212 int wtmpx_get_entry(struct logininfo *li);
214 extern Buffer loginmsg;
216 /* pick the shortest string */
217 #define MIN_SIZEOF(s1,s2) (sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2))
220 ** platform-independent login functions
224 * login_login(struct logininfo *) - Record a login
226 * Call with a pointer to a struct logininfo initialised with
227 * login_init_entry() or login_alloc_entry()
231 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
234 login_login(struct logininfo *li)
236 li->type = LTYPE_LOGIN;
237 return (login_write(li));
242 * login_logout(struct logininfo *) - Record a logout
244 * Call as with login_login()
248 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
251 login_logout(struct logininfo *li)
253 li->type = LTYPE_LOGOUT;
254 return (login_write(li));
258 * login_get_lastlog_time(int) - Retrieve the last login time
260 * Retrieve the last login time for the given uid. Will try to use the
261 * system lastlog facilities if they are available, but will fall back
262 * to looking in wtmp/wtmpx if necessary
265 * 0 on failure, or if user has never logged in
266 * Time in seconds from the epoch if successful
268 * Useful preprocessor symbols:
269 * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog
271 * USE_LASTLOG: If set, indicates the presence of system lastlog
272 * facilities. If this and DISABLE_LASTLOG are not set,
273 * try to retrieve lastlog information from wtmp/wtmpx.
276 login_get_lastlog_time(const int uid)
280 if (login_get_lastlog(&li, uid))
287 * login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry
289 * Retrieve a logininfo structure populated (only partially) with
290 * information from the system lastlog data, or from wtmp/wtmpx if no
291 * system lastlog information exists.
293 * Note this routine must be given a pre-allocated logininfo.
296 * >0: A pointer to your struct logininfo if successful
297 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
300 login_get_lastlog(struct logininfo *li, const int uid)
304 memset(li, '\0', sizeof(*li));
308 * If we don't have a 'real' lastlog, we need the username to
309 * reliably search wtmp(x) for the last login (see
314 fatal("%s: Cannot find account for uid %i", __func__, uid);
316 /* No MIN_SIZEOF here - we absolutely *must not* truncate the
317 * username (XXX - so check for trunc!) */
318 strlcpy(li->username, pw->pw_name, sizeof(li->username));
320 if (getlast_entry(li))
328 * login_alloc_entry(int, char*, char*, char*) - Allocate and initialise
329 * a logininfo structure
331 * This function creates a new struct logininfo, a data structure
332 * meant to carry the information required to portably record login info.
334 * Returns a pointer to a newly created struct logininfo. If memory
335 * allocation fails, the program halts.
338 logininfo *login_alloc_entry(int pid, const char *username,
339 const char *hostname, const char *line)
341 struct logininfo *newli;
343 newli = xmalloc(sizeof(*newli));
344 login_init_entry(newli, pid, username, hostname, line);
349 /* login_free_entry(struct logininfo *) - free struct memory */
351 login_free_entry(struct logininfo *li)
357 /* login_init_entry(struct logininfo *, int, char*, char*, char*)
358 * - initialise a struct logininfo
360 * Populates a new struct logininfo, a data structure meant to carry
361 * the information required to portably record login info.
366 login_init_entry(struct logininfo *li, int pid, const char *username,
367 const char *hostname, const char *line)
371 memset(li, 0, sizeof(*li));
375 /* set the line information */
377 line_fullname(li->line, line, sizeof(li->line));
380 strlcpy(li->username, username, sizeof(li->username));
381 pw = getpwnam(li->username);
383 fatal("%s: Cannot find user \"%s\"", __func__,
386 li->uid = pw->pw_uid;
390 strlcpy(li->hostname, hostname, sizeof(li->hostname));
396 * login_set_current_time(struct logininfo *) - set the current time
398 * Set the current time in a logininfo structure. This function is
399 * meant to eliminate the need to deal with system dependencies for
403 login_set_current_time(struct logininfo *li)
407 gettimeofday(&tv, NULL);
409 li->tv_sec = tv.tv_sec;
410 li->tv_usec = tv.tv_usec;
413 /* copy a sockaddr_* into our logininfo */
415 login_set_addr(struct logininfo *li, const struct sockaddr *sa,
416 const unsigned int sa_size)
418 unsigned int bufsize = sa_size;
420 /* make sure we don't overrun our union */
421 if (sizeof(li->hostaddr) < sa_size)
422 bufsize = sizeof(li->hostaddr);
424 memcpy(&li->hostaddr.sa, sa, bufsize);
429 ** login_write: Call low-level recording functions based on autoconf
433 login_write(struct logininfo *li)
436 if (geteuid() != 0) {
437 logit("Attempt to write login records by non-root user (aborting)");
442 /* set the timestamp */
443 login_set_current_time(li);
445 syslogin_write_entry(li);
448 if (li->type == LTYPE_LOGIN)
449 lastlog_write_entry(li);
452 utmp_write_entry(li);
455 wtmp_write_entry(li);
458 utmpx_write_entry(li);
461 wtmpx_write_entry(li);
463 #ifdef CUSTOM_SYS_AUTH_RECORD_LOGIN
464 if (li->type == LTYPE_LOGIN &&
465 !sys_auth_record_login(li->username,li->hostname,li->line,
467 logit("Writing login record failed for %s", li->username);
469 #ifdef SSH_AUDIT_EVENTS
470 if (li->type == LTYPE_LOGIN)
471 audit_session_open(li->line);
472 else if (li->type == LTYPE_LOGOUT)
473 audit_session_close(li->line);
478 #ifdef LOGIN_NEEDS_UTMPX
480 login_utmp_only(struct logininfo *li)
482 li->type = LTYPE_LOGIN;
483 login_set_current_time(li);
485 utmp_write_entry(li);
488 wtmp_write_entry(li);
491 utmpx_write_entry(li);
494 wtmpx_write_entry(li);
501 ** getlast_entry: Call low-level functions to retrieve the last login
505 /* take the uid in li and return the last login time */
507 getlast_entry(struct logininfo *li)
510 return(lastlog_get_entry(li));
511 #else /* !USE_LASTLOG */
513 #if defined(DISABLE_LASTLOG)
514 /* On some systems we shouldn't even try to obtain last login
517 # elif defined(USE_WTMP) && \
518 (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP))
519 /* retrieve last login time from utmp */
520 return (wtmp_get_entry(li));
521 # elif defined(USE_WTMPX) && \
522 (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX))
523 /* If wtmp isn't available, try wtmpx */
524 return (wtmpx_get_entry(li));
526 /* Give up: No means of retrieving last login time */
528 # endif /* DISABLE_LASTLOG */
529 #endif /* USE_LASTLOG */
535 * 'line' string utility functions
537 * These functions process the 'line' string into one of three forms:
539 * 1. The full filename (including '/dev')
540 * 2. The stripped name (excluding '/dev')
541 * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00
542 * /dev/pts/1 -> ts/1 )
544 * Form 3 is used on some systems to identify a .tmp.? entry when
545 * attempting to remove it. Typically both addition and removal is
546 * performed by one application - say, sshd - so as long as the choice
547 * uniquely identifies a terminal it's ok.
552 * line_fullname(): add the leading '/dev/' if it doesn't exist make
553 * sure dst has enough space, if not just copy src (ugh)
556 line_fullname(char *dst, const char *src, u_int dstsize)
558 memset(dst, '\0', dstsize);
559 if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5)))
560 strlcpy(dst, src, dstsize);
562 strlcpy(dst, "/dev/", dstsize);
563 strlcat(dst, src, dstsize);
568 /* line_stripname(): strip the leading '/dev' if it exists, return dst */
570 line_stripname(char *dst, const char *src, int dstsize)
572 memset(dst, '\0', dstsize);
573 if (strncmp(src, "/dev/", 5) == 0)
574 strlcpy(dst, src + 5, dstsize);
576 strlcpy(dst, src, dstsize);
581 * line_abbrevname(): Return the abbreviated (usually four-character)
582 * form of the line (Just use the last <dstsize> characters of the
585 * NOTE: use strncpy because we do NOT necessarily want zero
589 line_abbrevname(char *dst, const char *src, int dstsize)
593 memset(dst, '\0', dstsize);
595 /* Always skip prefix if present */
596 if (strncmp(src, "/dev/", 5) == 0)
599 #ifdef WITH_ABBREV_NO_TTY
600 if (strncmp(src, "tty", 3) == 0)
607 if (((int)len - dstsize) > 0)
608 src += ((int)len - dstsize);
610 /* note: _don't_ change this to strlcpy */
611 strncpy(dst, src, (size_t)dstsize);
618 ** utmp utility functions
620 ** These functions manipulate struct utmp, taking system differences
624 #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN)
626 /* build the utmp structure */
628 set_utmp_time(struct logininfo *li, struct utmp *ut)
630 # if defined(HAVE_TV_IN_UTMP)
631 ut->ut_tv.tv_sec = li->tv_sec;
632 ut->ut_tv.tv_usec = li->tv_usec;
633 # elif defined(HAVE_TIME_IN_UTMP)
634 ut->ut_time = li->tv_sec;
639 construct_utmp(struct logininfo *li,
642 # ifdef HAVE_ADDR_V6_IN_UTMP
643 struct sockaddr_in6 *sa6;
646 memset(ut, '\0', sizeof(*ut));
648 /* First fill out fields used for both logins and logouts */
650 # ifdef HAVE_ID_IN_UTMP
651 line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id));
654 # ifdef HAVE_TYPE_IN_UTMP
655 /* This is done here to keep utmp constants out of struct logininfo */
658 ut->ut_type = USER_PROCESS;
664 ut->ut_type = DEAD_PROCESS;
666 cray_retain_utmp(ut, li->pid);
671 set_utmp_time(li, ut);
673 line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line));
675 # ifdef HAVE_PID_IN_UTMP
676 ut->ut_pid = li->pid;
679 /* If we're logging out, leave all other fields blank */
680 if (li->type == LTYPE_LOGOUT)
684 * These fields are only used when logging in, and are blank
688 /* Use strncpy because we don't necessarily want null termination */
689 strncpy(ut->ut_name, li->username,
690 MIN_SIZEOF(ut->ut_name, li->username));
691 # ifdef HAVE_HOST_IN_UTMP
692 realhostname_sa(ut->ut_host, sizeof ut->ut_host,
693 &li->hostaddr.sa, li->hostaddr.sa.sa_len);
695 # ifdef HAVE_ADDR_IN_UTMP
696 /* this is just a 32-bit IP address */
697 if (li->hostaddr.sa.sa_family == AF_INET)
698 ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
700 # ifdef HAVE_ADDR_V6_IN_UTMP
701 /* this is just a 128-bit IPv6 address */
702 if (li->hostaddr.sa.sa_family == AF_INET6) {
703 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa);
704 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16);
705 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
706 ut->ut_addr_v6[0] = ut->ut_addr_v6[3];
707 ut->ut_addr_v6[1] = 0;
708 ut->ut_addr_v6[2] = 0;
709 ut->ut_addr_v6[3] = 0;
714 #endif /* USE_UTMP || USE_WTMP || USE_LOGIN */
717 ** utmpx utility functions
719 ** These functions manipulate struct utmpx, accounting for system
723 #if defined(USE_UTMPX) || defined (USE_WTMPX)
724 /* build the utmpx structure */
726 set_utmpx_time(struct logininfo *li, struct utmpx *utx)
728 # if defined(HAVE_TV_IN_UTMPX)
729 utx->ut_tv.tv_sec = li->tv_sec;
730 utx->ut_tv.tv_usec = li->tv_usec;
731 # elif defined(HAVE_TIME_IN_UTMPX)
732 utx->ut_time = li->tv_sec;
737 construct_utmpx(struct logininfo *li, struct utmpx *utx)
739 # ifdef HAVE_ADDR_V6_IN_UTMP
740 struct sockaddr_in6 *sa6;
742 memset(utx, '\0', sizeof(*utx));
744 # ifdef HAVE_ID_IN_UTMPX
745 line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id));
748 /* this is done here to keep utmp constants out of loginrec.h */
751 utx->ut_type = USER_PROCESS;
754 utx->ut_type = DEAD_PROCESS;
757 line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line));
758 set_utmpx_time(li, utx);
759 utx->ut_pid = li->pid;
761 /* strncpy(): Don't necessarily want null termination */
762 strncpy(utx->ut_name, li->username,
763 MIN_SIZEOF(utx->ut_name, li->username));
765 if (li->type == LTYPE_LOGOUT)
769 * These fields are only used when logging in, and are blank
773 # ifdef HAVE_HOST_IN_UTMPX
774 strncpy(utx->ut_host, li->hostname,
775 MIN_SIZEOF(utx->ut_host, li->hostname));
777 # ifdef HAVE_ADDR_IN_UTMPX
778 /* this is just a 32-bit IP address */
779 if (li->hostaddr.sa.sa_family == AF_INET)
780 utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
782 # ifdef HAVE_ADDR_V6_IN_UTMP
783 /* this is just a 128-bit IPv6 address */
784 if (li->hostaddr.sa.sa_family == AF_INET6) {
785 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa);
786 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16);
787 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
788 ut->ut_addr_v6[0] = ut->ut_addr_v6[3];
789 ut->ut_addr_v6[1] = 0;
790 ut->ut_addr_v6[2] = 0;
791 ut->ut_addr_v6[3] = 0;
795 # ifdef HAVE_SYSLEN_IN_UTMPX
796 /* ut_syslen is the length of the utx_host string */
797 utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host));
800 #endif /* USE_UTMPX || USE_WTMPX */
803 ** Low-level utmp functions
806 /* FIXME: (ATL) utmp_write_direct needs testing */
809 /* if we can, use pututline() etc. */
810 # if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \
811 defined(HAVE_PUTUTLINE)
812 # define UTMP_USE_LIBRARY
816 /* write a utmp entry with the system's help (pututline() and pals) */
817 # ifdef UTMP_USE_LIBRARY
819 utmp_write_library(struct logininfo *li, struct utmp *ut)
823 # ifdef HAVE_ENDUTENT
828 # else /* UTMP_USE_LIBRARY */
831 * Write a utmp entry direct to the file
832 * This is a slightly modification of code in OpenBSD's login.c
835 utmp_write_direct(struct logininfo *li, struct utmp *ut)
841 /* FIXME: (ATL) ttyslot() needs local implementation */
843 #if defined(HAVE_GETTTYENT)
848 while (NULL != (ty = getttyent())) {
850 if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line)))
856 logit("%s: tty not found", __func__);
861 tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */
863 #endif /* HAVE_GETTTYENT */
865 if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) {
868 pos = (off_t)tty * sizeof(struct utmp);
869 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) {
870 logit("%s: lseek: %s", __func__, strerror(errno));
874 logit("%s: Couldn't seek to tty %d slot in %s",
875 __func__, tty, UTMP_FILE);
879 * Prevent luser from zero'ing out ut_host.
880 * If the new ut_line is empty but the old one is not
881 * and ut_line and ut_name match, preserve the old ut_line.
883 if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) &&
884 (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') &&
885 (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) &&
886 (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0))
887 memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host));
889 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) {
890 logit("%s: lseek: %s", __func__, strerror(errno));
894 logit("%s: Couldn't seek to tty %d slot in %s",
895 __func__, tty, UTMP_FILE);
898 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
899 logit("%s: error writing %s: %s", __func__,
900 UTMP_FILE, strerror(errno));
909 # endif /* UTMP_USE_LIBRARY */
912 utmp_perform_login(struct logininfo *li)
916 construct_utmp(li, &ut);
917 # ifdef UTMP_USE_LIBRARY
918 if (!utmp_write_library(li, &ut)) {
919 logit("%s: utmp_write_library() failed", __func__);
923 if (!utmp_write_direct(li, &ut)) {
924 logit("%s: utmp_write_direct() failed", __func__);
933 utmp_perform_logout(struct logininfo *li)
937 construct_utmp(li, &ut);
938 # ifdef UTMP_USE_LIBRARY
939 if (!utmp_write_library(li, &ut)) {
940 logit("%s: utmp_write_library() failed", __func__);
944 if (!utmp_write_direct(li, &ut)) {
945 logit("%s: utmp_write_direct() failed", __func__);
954 utmp_write_entry(struct logininfo *li)
958 return (utmp_perform_login(li));
961 return (utmp_perform_logout(li));
964 logit("%s: invalid type field", __func__);
968 #endif /* USE_UTMP */
972 ** Low-level utmpx functions
975 /* not much point if we don't want utmpx entries */
978 /* if we have the wherewithall, use pututxline etc. */
979 # if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \
980 defined(HAVE_PUTUTXLINE)
981 # define UTMPX_USE_LIBRARY
985 /* write a utmpx entry with the system's help (pututxline() and pals) */
986 # ifdef UTMPX_USE_LIBRARY
988 utmpx_write_library(struct logininfo *li, struct utmpx *utx)
993 # ifdef HAVE_ENDUTXENT
999 # else /* UTMPX_USE_LIBRARY */
1001 /* write a utmp entry direct to the file */
1003 utmpx_write_direct(struct logininfo *li, struct utmpx *utx)
1005 logit("%s: not implemented!", __func__);
1008 # endif /* UTMPX_USE_LIBRARY */
1011 utmpx_perform_login(struct logininfo *li)
1015 construct_utmpx(li, &utx);
1016 # ifdef UTMPX_USE_LIBRARY
1017 if (!utmpx_write_library(li, &utx)) {
1018 logit("%s: utmp_write_library() failed", __func__);
1022 if (!utmpx_write_direct(li, &ut)) {
1023 logit("%s: utmp_write_direct() failed", __func__);
1032 utmpx_perform_logout(struct logininfo *li)
1036 construct_utmpx(li, &utx);
1037 # ifdef HAVE_ID_IN_UTMPX
1038 line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id));
1040 # ifdef HAVE_TYPE_IN_UTMPX
1041 utx.ut_type = DEAD_PROCESS;
1044 # ifdef UTMPX_USE_LIBRARY
1045 utmpx_write_library(li, &utx);
1047 utmpx_write_direct(li, &utx);
1053 utmpx_write_entry(struct logininfo *li)
1057 return (utmpx_perform_login(li));
1059 return (utmpx_perform_logout(li));
1061 logit("%s: invalid type field", __func__);
1065 #endif /* USE_UTMPX */
1069 ** Low-level wtmp functions
1075 * Write a wtmp entry direct to the end of the file
1076 * This is a slight modification of code in OpenBSD's logwtmp.c
1079 wtmp_write(struct logininfo *li, struct utmp *ut)
1084 if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
1085 logit("%s: problem writing %s: %s", __func__,
1086 WTMP_FILE, strerror(errno));
1089 if (fstat(fd, &buf) == 0)
1090 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
1091 ftruncate(fd, buf.st_size);
1092 logit("%s: problem writing %s: %s", __func__,
1093 WTMP_FILE, strerror(errno));
1101 wtmp_perform_login(struct logininfo *li)
1105 construct_utmp(li, &ut);
1106 return (wtmp_write(li, &ut));
1111 wtmp_perform_logout(struct logininfo *li)
1115 construct_utmp(li, &ut);
1116 return (wtmp_write(li, &ut));
1121 wtmp_write_entry(struct logininfo *li)
1125 return (wtmp_perform_login(li));
1127 return (wtmp_perform_logout(li));
1129 logit("%s: invalid type field", __func__);
1136 * Notes on fetching login data from wtmp/wtmpx
1138 * Logouts are usually recorded with (amongst other things) a blank
1139 * username on a given tty line. However, some systems (HP-UX is one)
1140 * leave all fields set, but change the ut_type field to DEAD_PROCESS.
1142 * Since we're only looking for logins here, we know that the username
1143 * must be set correctly. On systems that leave it in, we check for
1144 * ut_type==USER_PROCESS (indicating a login.)
1146 * Portability: Some systems may set something other than USER_PROCESS
1147 * to indicate a login process. I don't know of any as I write. Also,
1148 * it's possible that some systems may both leave the username in
1149 * place and not have ut_type.
1152 /* return true if this wtmp entry indicates a login */
1154 wtmp_islogin(struct logininfo *li, struct utmp *ut)
1156 if (strncmp(li->username, ut->ut_name,
1157 MIN_SIZEOF(li->username, ut->ut_name)) == 0) {
1158 # ifdef HAVE_TYPE_IN_UTMP
1159 if (ut->ut_type & USER_PROCESS)
1169 wtmp_get_entry(struct logininfo *li)
1175 /* Clear the time entries in our logininfo */
1176 li->tv_sec = li->tv_usec = 0;
1178 if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) {
1179 logit("%s: problem opening %s: %s", __func__,
1180 WTMP_FILE, strerror(errno));
1183 if (fstat(fd, &st) != 0) {
1184 logit("%s: couldn't stat %s: %s", __func__,
1185 WTMP_FILE, strerror(errno));
1190 /* Seek to the start of the last struct utmp */
1191 if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) {
1192 /* Looks like we've got a fresh wtmp file */
1198 if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) {
1199 logit("%s: read of %s failed: %s", __func__,
1200 WTMP_FILE, strerror(errno));
1204 if ( wtmp_islogin(li, &ut) ) {
1207 * We've already checked for a time in struct
1208 * utmp, in login_getlast()
1210 # ifdef HAVE_TIME_IN_UTMP
1211 li->tv_sec = ut.ut_time;
1213 # if HAVE_TV_IN_UTMP
1214 li->tv_sec = ut.ut_tv.tv_sec;
1217 line_fullname(li->line, ut.ut_line,
1218 MIN_SIZEOF(li->line, ut.ut_line));
1219 # ifdef HAVE_HOST_IN_UTMP
1220 strlcpy(li->hostname, ut.ut_host,
1221 MIN_SIZEOF(li->hostname, ut.ut_host));
1225 /* Seek back 2 x struct utmp */
1226 if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) {
1227 /* We've found the start of the file, so quit */
1233 /* We found an entry. Tidy up and return */
1237 # endif /* USE_WTMP */
1241 ** Low-level wtmpx functions
1246 * Write a wtmpx entry direct to the end of the file
1247 * This is a slight modification of code in OpenBSD's logwtmp.c
1250 wtmpx_write(struct logininfo *li, struct utmpx *utx)
1252 #ifndef HAVE_UPDWTMPX
1256 if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
1257 logit("%s: problem opening %s: %s", __func__,
1258 WTMPX_FILE, strerror(errno));
1262 if (fstat(fd, &buf) == 0)
1263 if (atomicio(vwrite, fd, utx, sizeof(*utx)) != sizeof(*utx)) {
1264 ftruncate(fd, buf.st_size);
1265 logit("%s: problem writing %s: %s", __func__,
1266 WTMPX_FILE, strerror(errno));
1273 updwtmpx(WTMPX_FILE, utx);
1280 wtmpx_perform_login(struct logininfo *li)
1284 construct_utmpx(li, &utx);
1285 return (wtmpx_write(li, &utx));
1290 wtmpx_perform_logout(struct logininfo *li)
1294 construct_utmpx(li, &utx);
1295 return (wtmpx_write(li, &utx));
1300 wtmpx_write_entry(struct logininfo *li)
1304 return (wtmpx_perform_login(li));
1306 return (wtmpx_perform_logout(li));
1308 logit("%s: invalid type field", __func__);
1313 /* Please see the notes above wtmp_islogin() for information about the
1314 next two functions */
1316 /* Return true if this wtmpx entry indicates a login */
1318 wtmpx_islogin(struct logininfo *li, struct utmpx *utx)
1320 if (strncmp(li->username, utx->ut_name,
1321 MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) {
1322 # ifdef HAVE_TYPE_IN_UTMPX
1323 if (utx->ut_type == USER_PROCESS)
1334 wtmpx_get_entry(struct logininfo *li)
1340 /* Clear the time entries */
1341 li->tv_sec = li->tv_usec = 0;
1343 if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) {
1344 logit("%s: problem opening %s: %s", __func__,
1345 WTMPX_FILE, strerror(errno));
1348 if (fstat(fd, &st) != 0) {
1349 logit("%s: couldn't stat %s: %s", __func__,
1350 WTMPX_FILE, strerror(errno));
1355 /* Seek to the start of the last struct utmpx */
1356 if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) {
1357 /* probably a newly rotated wtmpx file */
1363 if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) {
1364 logit("%s: read of %s failed: %s", __func__,
1365 WTMPX_FILE, strerror(errno));
1370 * Logouts are recorded as a blank username on a particular
1371 * line. So, we just need to find the username in struct utmpx
1373 if (wtmpx_islogin(li, &utx)) {
1375 # if defined(HAVE_TV_IN_UTMPX)
1376 li->tv_sec = utx.ut_tv.tv_sec;
1377 # elif defined(HAVE_TIME_IN_UTMPX)
1378 li->tv_sec = utx.ut_time;
1380 line_fullname(li->line, utx.ut_line, sizeof(li->line));
1381 # if defined(HAVE_HOST_IN_UTMPX)
1382 strlcpy(li->hostname, utx.ut_host,
1383 MIN_SIZEOF(li->hostname, utx.ut_host));
1387 if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) {
1396 #endif /* USE_WTMPX */
1399 ** Low-level libutil login() functions
1404 syslogin_perform_login(struct logininfo *li)
1408 ut = xmalloc(sizeof(*ut));
1409 construct_utmp(li, ut);
1417 syslogin_perform_logout(struct logininfo *li)
1420 char line[UT_LINESIZE];
1422 (void)line_stripname(line, li->line, sizeof(line));
1425 logit("%s: logout() returned an error", __func__);
1426 # ifdef HAVE_LOGWTMP
1428 logwtmp(line, "", "");
1430 /* FIXME: (ATL - if the need arises) What to do if we have
1431 * login, but no logout? what if logout but no logwtmp? All
1432 * routines are in libutil so they should all be there,
1439 syslogin_write_entry(struct logininfo *li)
1443 return (syslogin_perform_login(li));
1445 return (syslogin_perform_logout(li));
1447 logit("%s: Invalid type field", __func__);
1451 #endif /* USE_LOGIN */
1453 /* end of file log-syslogin.c */
1456 ** Low-level lastlog functions
1465 lastlog_construct(struct logininfo *li, struct lastlog *last)
1467 /* clear the structure */
1468 memset(last, '\0', sizeof(*last));
1470 line_stripname(last->ll_line, li->line, sizeof(last->ll_line));
1471 strlcpy(last->ll_host, li->hostname,
1472 MIN_SIZEOF(last->ll_host, li->hostname));
1473 last->ll_time = li->tv_sec;
1477 lastlog_filetype(char *filename)
1481 if (stat(LASTLOG_FILE, &st) != 0) {
1482 logit("%s: Couldn't stat %s: %s", __func__,
1483 LASTLOG_FILE, strerror(errno));
1486 if (S_ISDIR(st.st_mode))
1488 else if (S_ISREG(st.st_mode))
1495 /* open the file (using filemode) and seek to the login entry */
1497 lastlog_openseek(struct logininfo *li, int *fd, int filemode)
1501 char lastlog_file[1024];
1503 type = lastlog_filetype(LASTLOG_FILE);
1506 strlcpy(lastlog_file, LASTLOG_FILE,
1507 sizeof(lastlog_file));
1510 snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s",
1511 LASTLOG_FILE, li->username);
1514 logit("%s: %.100s is not a file or directory!", __func__,
1519 *fd = open(lastlog_file, filemode, 0600);
1521 debug("%s: Couldn't open %s: %s", __func__,
1522 lastlog_file, strerror(errno));
1526 if (type == LL_FILE) {
1527 /* find this uid's offset in the lastlog file */
1528 offset = (off_t) ((long)li->uid * sizeof(struct lastlog));
1530 if (lseek(*fd, offset, SEEK_SET) != offset) {
1531 logit("%s: %s->lseek(): %s", __func__,
1532 lastlog_file, strerror(errno));
1541 lastlog_perform_login(struct logininfo *li)
1543 struct lastlog last;
1546 /* create our struct lastlog */
1547 lastlog_construct(li, &last);
1549 if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT))
1552 /* write the entry */
1553 if (atomicio(vwrite, fd, &last, sizeof(last)) != sizeof(last)) {
1555 logit("%s: Error writing to %s: %s", __func__,
1556 LASTLOG_FILE, strerror(errno));
1565 lastlog_write_entry(struct logininfo *li)
1569 return (lastlog_perform_login(li));
1571 logit("%s: Invalid type field", __func__);
1577 lastlog_populate_entry(struct logininfo *li, struct lastlog *last)
1579 line_fullname(li->line, last->ll_line, sizeof(li->line));
1580 strlcpy(li->hostname, last->ll_host,
1581 MIN_SIZEOF(li->hostname, last->ll_host));
1582 li->tv_sec = last->ll_time;
1586 lastlog_get_entry(struct logininfo *li)
1588 struct lastlog last;
1591 if (!lastlog_openseek(li, &fd, O_RDONLY))
1594 ret = atomicio(read, fd, &last, sizeof(last));
1599 memset(&last, '\0', sizeof(last));
1602 lastlog_populate_entry(li, &last);
1605 error("%s: Error reading from %s: %s", __func__,
1606 LASTLOG_FILE, strerror(errno));
1609 error("%s: Error reading from %s: Expecting %d, got %d",
1610 __func__, LASTLOG_FILE, (int)sizeof(last), ret);
1617 #endif /* USE_LASTLOG */
1621 * Logs failed login attempts in _PATH_BTMP if that exists.
1622 * The most common login failure is to give password instead of username.
1623 * So the _PATH_BTMP file checked for the correct permission, so that
1624 * only root can read it.
1628 record_failed_login(const char *username, const char *hostname,
1633 struct sockaddr_storage from;
1634 socklen_t fromlen = sizeof(from);
1635 struct sockaddr_in *a4;
1636 struct sockaddr_in6 *a6;
1642 if ((fd = open(_PATH_BTMP, O_WRONLY | O_APPEND)) < 0) {
1643 debug("Unable to open the btmp file %s: %s", _PATH_BTMP,
1647 if (fstat(fd, &fst) < 0) {
1648 logit("%s: fstat of %s failed: %s", __func__, _PATH_BTMP,
1652 if((fst.st_mode & (S_IRWXG | S_IRWXO)) || (fst.st_uid != 0)){
1653 logit("Excess permission or bad ownership on file %s",
1658 memset(&ut, 0, sizeof(ut));
1659 /* strncpy because we don't necessarily want nul termination */
1660 strncpy(ut.ut_user, username, sizeof(ut.ut_user));
1661 strlcpy(ut.ut_line, "ssh:notty", sizeof(ut.ut_line));
1664 ut.ut_time = t; /* ut_time is not always a time_t */
1665 ut.ut_type = LOGIN_PROCESS;
1666 ut.ut_pid = getpid();
1668 /* strncpy because we don't necessarily want nul termination */
1669 strncpy(ut.ut_host, hostname, sizeof(ut.ut_host));
1671 if (packet_connection_is_on_socket() &&
1672 getpeername(packet_get_connection_in(),
1673 (struct sockaddr *)&from, &fromlen) == 0) {
1674 ipv64_normalise_mapped(&from, &fromlen);
1675 if (from.ss_family == AF_INET) {
1676 a4 = (struct sockaddr_in *)&from;
1677 memcpy(&ut.ut_addr, &(a4->sin_addr),
1678 MIN_SIZEOF(ut.ut_addr, a4->sin_addr));
1680 #ifdef HAVE_ADDR_V6_IN_UTMP
1681 if (from.ss_family == AF_INET6) {
1682 a6 = (struct sockaddr_in6 *)&from;
1683 memcpy(&ut.ut_addr_v6, &(a6->sin6_addr),
1684 MIN_SIZEOF(ut.ut_addr_v6, a6->sin6_addr));
1689 if (atomicio(vwrite, fd, &ut, sizeof(ut)) != sizeof(ut))
1690 error("Failed to write to %s: %s", _PATH_BTMP,
1696 #endif /* USE_BTMP */