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>
162 #include "loginrec.h"
164 #include "atomicio.h"
166 #include "canohost.h"
174 #ifdef HAVE_LIBUTIL_H
175 # include <libutil.h>
179 ** prototypes for helper functions in this file
183 void set_utmp_time(struct logininfo *li, struct utmp *ut);
184 void construct_utmp(struct logininfo *li, struct utmp *ut);
188 void set_utmpx_time(struct logininfo *li, struct utmpx *ut);
189 void construct_utmpx(struct logininfo *li, struct utmpx *ut);
192 int utmp_write_entry(struct logininfo *li);
193 int utmpx_write_entry(struct logininfo *li);
194 int wtmp_write_entry(struct logininfo *li);
195 int wtmpx_write_entry(struct logininfo *li);
196 int lastlog_write_entry(struct logininfo *li);
197 int syslogin_write_entry(struct logininfo *li);
199 int getlast_entry(struct logininfo *li);
200 int lastlog_get_entry(struct logininfo *li);
201 int wtmp_get_entry(struct logininfo *li);
202 int wtmpx_get_entry(struct logininfo *li);
204 extern Buffer loginmsg;
206 /* pick the shortest string */
207 #define MIN_SIZEOF(s1,s2) (sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2))
210 ** platform-independent login functions
214 * login_login(struct logininfo *) - Record a login
216 * Call with a pointer to a struct logininfo initialised with
217 * login_init_entry() or login_alloc_entry()
221 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
224 login_login(struct logininfo *li)
226 li->type = LTYPE_LOGIN;
227 return (login_write(li));
232 * login_logout(struct logininfo *) - Record a logout
234 * Call as with login_login()
238 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
241 login_logout(struct logininfo *li)
243 li->type = LTYPE_LOGOUT;
244 return (login_write(li));
248 * login_get_lastlog_time(int) - Retrieve the last login time
250 * Retrieve the last login time for the given uid. Will try to use the
251 * system lastlog facilities if they are available, but will fall back
252 * to looking in wtmp/wtmpx if necessary
255 * 0 on failure, or if user has never logged in
256 * Time in seconds from the epoch if successful
258 * Useful preprocessor symbols:
259 * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog
261 * USE_LASTLOG: If set, indicates the presence of system lastlog
262 * facilities. If this and DISABLE_LASTLOG are not set,
263 * try to retrieve lastlog information from wtmp/wtmpx.
266 login_get_lastlog_time(const int uid)
270 if (login_get_lastlog(&li, uid))
277 * login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry
279 * Retrieve a logininfo structure populated (only partially) with
280 * information from the system lastlog data, or from wtmp/wtmpx if no
281 * system lastlog information exists.
283 * Note this routine must be given a pre-allocated logininfo.
286 * >0: A pointer to your struct logininfo if successful
287 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
290 login_get_lastlog(struct logininfo *li, const int uid)
294 memset(li, '\0', sizeof(*li));
298 * If we don't have a 'real' lastlog, we need the username to
299 * reliably search wtmp(x) for the last login (see
304 fatal("%s: Cannot find account for uid %i", __func__, uid);
306 /* No MIN_SIZEOF here - we absolutely *must not* truncate the
307 * username (XXX - so check for trunc!) */
308 strlcpy(li->username, pw->pw_name, sizeof(li->username));
310 if (getlast_entry(li))
318 * login_alloc_entry(int, char*, char*, char*) - Allocate and initialise
319 * a logininfo structure
321 * This function creates a new struct logininfo, a data structure
322 * meant to carry the information required to portably record login info.
324 * Returns a pointer to a newly created struct logininfo. If memory
325 * allocation fails, the program halts.
328 logininfo *login_alloc_entry(int pid, const char *username,
329 const char *hostname, const char *line)
331 struct logininfo *newli;
333 newli = xmalloc(sizeof(*newli));
334 login_init_entry(newli, pid, username, hostname, line);
339 /* login_free_entry(struct logininfo *) - free struct memory */
341 login_free_entry(struct logininfo *li)
347 /* login_init_entry(struct logininfo *, int, char*, char*, char*)
348 * - initialise a struct logininfo
350 * Populates a new struct logininfo, a data structure meant to carry
351 * the information required to portably record login info.
356 login_init_entry(struct logininfo *li, int pid, const char *username,
357 const char *hostname, const char *line)
361 memset(li, 0, sizeof(*li));
365 /* set the line information */
367 line_fullname(li->line, line, sizeof(li->line));
370 strlcpy(li->username, username, sizeof(li->username));
371 pw = getpwnam(li->username);
373 fatal("%s: Cannot find user \"%s\"", __func__,
376 li->uid = pw->pw_uid;
380 strlcpy(li->hostname, hostname, sizeof(li->hostname));
386 * login_set_current_time(struct logininfo *) - set the current time
388 * Set the current time in a logininfo structure. This function is
389 * meant to eliminate the need to deal with system dependencies for
393 login_set_current_time(struct logininfo *li)
397 gettimeofday(&tv, NULL);
399 li->tv_sec = tv.tv_sec;
400 li->tv_usec = tv.tv_usec;
403 /* copy a sockaddr_* into our logininfo */
405 login_set_addr(struct logininfo *li, const struct sockaddr *sa,
406 const unsigned int sa_size)
408 unsigned int bufsize = sa_size;
410 /* make sure we don't overrun our union */
411 if (sizeof(li->hostaddr) < sa_size)
412 bufsize = sizeof(li->hostaddr);
414 memcpy(&li->hostaddr.sa, sa, bufsize);
419 ** login_write: Call low-level recording functions based on autoconf
423 login_write(struct logininfo *li)
426 if (geteuid() != 0) {
427 logit("Attempt to write login records by non-root user (aborting)");
432 /* set the timestamp */
433 login_set_current_time(li);
435 syslogin_write_entry(li);
438 if (li->type == LTYPE_LOGIN)
439 lastlog_write_entry(li);
442 utmp_write_entry(li);
445 wtmp_write_entry(li);
448 utmpx_write_entry(li);
451 wtmpx_write_entry(li);
453 #ifdef CUSTOM_SYS_AUTH_RECORD_LOGIN
454 if (li->type == LTYPE_LOGIN &&
455 !sys_auth_record_login(li->username,li->hostname,li->line,
457 logit("Writing login record failed for %s", li->username);
459 #ifdef SSH_AUDIT_EVENTS
460 if (li->type == LTYPE_LOGIN)
461 audit_session_open(li->line);
462 else if (li->type == LTYPE_LOGOUT)
463 audit_session_close(li->line);
468 #ifdef LOGIN_NEEDS_UTMPX
470 login_utmp_only(struct logininfo *li)
472 li->type = LTYPE_LOGIN;
473 login_set_current_time(li);
475 utmp_write_entry(li);
478 wtmp_write_entry(li);
481 utmpx_write_entry(li);
484 wtmpx_write_entry(li);
491 ** getlast_entry: Call low-level functions to retrieve the last login
495 /* take the uid in li and return the last login time */
497 getlast_entry(struct logininfo *li)
500 return(lastlog_get_entry(li));
501 #else /* !USE_LASTLOG */
503 #if defined(DISABLE_LASTLOG)
504 /* On some systems we shouldn't even try to obtain last login
507 # elif defined(USE_WTMP) && \
508 (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP))
509 /* retrieve last login time from utmp */
510 return (wtmp_get_entry(li));
511 # elif defined(USE_WTMPX) && \
512 (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX))
513 /* If wtmp isn't available, try wtmpx */
514 return (wtmpx_get_entry(li));
516 /* Give up: No means of retrieving last login time */
518 # endif /* DISABLE_LASTLOG */
519 #endif /* USE_LASTLOG */
525 * 'line' string utility functions
527 * These functions process the 'line' string into one of three forms:
529 * 1. The full filename (including '/dev')
530 * 2. The stripped name (excluding '/dev')
531 * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00
532 * /dev/pts/1 -> ts/1 )
534 * Form 3 is used on some systems to identify a .tmp.? entry when
535 * attempting to remove it. Typically both addition and removal is
536 * performed by one application - say, sshd - so as long as the choice
537 * uniquely identifies a terminal it's ok.
542 * line_fullname(): add the leading '/dev/' if it doesn't exist make
543 * sure dst has enough space, if not just copy src (ugh)
546 line_fullname(char *dst, const char *src, u_int dstsize)
548 memset(dst, '\0', dstsize);
549 if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5)))
550 strlcpy(dst, src, dstsize);
552 strlcpy(dst, "/dev/", dstsize);
553 strlcat(dst, src, dstsize);
558 /* line_stripname(): strip the leading '/dev' if it exists, return dst */
560 line_stripname(char *dst, const char *src, int dstsize)
562 memset(dst, '\0', dstsize);
563 if (strncmp(src, "/dev/", 5) == 0)
564 strlcpy(dst, src + 5, dstsize);
566 strlcpy(dst, src, dstsize);
571 * line_abbrevname(): Return the abbreviated (usually four-character)
572 * form of the line (Just use the last <dstsize> characters of the
575 * NOTE: use strncpy because we do NOT necessarily want zero
579 line_abbrevname(char *dst, const char *src, int dstsize)
583 memset(dst, '\0', dstsize);
585 /* Always skip prefix if present */
586 if (strncmp(src, "/dev/", 5) == 0)
589 #ifdef WITH_ABBREV_NO_TTY
590 if (strncmp(src, "tty", 3) == 0)
597 if (((int)len - dstsize) > 0)
598 src += ((int)len - dstsize);
600 /* note: _don't_ change this to strlcpy */
601 strncpy(dst, src, (size_t)dstsize);
608 ** utmp utility functions
610 ** These functions manipulate struct utmp, taking system differences
614 #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN)
616 /* build the utmp structure */
618 set_utmp_time(struct logininfo *li, struct utmp *ut)
620 # if defined(HAVE_TV_IN_UTMP)
621 ut->ut_tv.tv_sec = li->tv_sec;
622 ut->ut_tv.tv_usec = li->tv_usec;
623 # elif defined(HAVE_TIME_IN_UTMP)
624 ut->ut_time = li->tv_sec;
629 construct_utmp(struct logininfo *li,
632 # ifdef HAVE_ADDR_V6_IN_UTMP
633 struct sockaddr_in6 *sa6;
636 memset(ut, '\0', sizeof(*ut));
638 /* First fill out fields used for both logins and logouts */
640 # ifdef HAVE_ID_IN_UTMP
641 line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id));
644 # ifdef HAVE_TYPE_IN_UTMP
645 /* This is done here to keep utmp constants out of struct logininfo */
648 ut->ut_type = USER_PROCESS;
654 ut->ut_type = DEAD_PROCESS;
656 cray_retain_utmp(ut, li->pid);
661 set_utmp_time(li, ut);
663 line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line));
665 # ifdef HAVE_PID_IN_UTMP
666 ut->ut_pid = li->pid;
669 /* If we're logging out, leave all other fields blank */
670 if (li->type == LTYPE_LOGOUT)
674 * These fields are only used when logging in, and are blank
678 /* Use strncpy because we don't necessarily want null termination */
679 strncpy(ut->ut_name, li->username,
680 MIN_SIZEOF(ut->ut_name, li->username));
681 # ifdef HAVE_HOST_IN_UTMP
682 strncpy(ut->ut_host, li->hostname,
683 MIN_SIZEOF(ut->ut_host, li->hostname));
685 # ifdef HAVE_ADDR_IN_UTMP
686 /* this is just a 32-bit IP address */
687 if (li->hostaddr.sa.sa_family == AF_INET)
688 ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
690 # ifdef HAVE_ADDR_V6_IN_UTMP
691 /* this is just a 128-bit IPv6 address */
692 if (li->hostaddr.sa.sa_family == AF_INET6) {
693 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa);
694 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16);
695 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
696 ut->ut_addr_v6[0] = ut->ut_addr_v6[3];
697 ut->ut_addr_v6[1] = 0;
698 ut->ut_addr_v6[2] = 0;
699 ut->ut_addr_v6[3] = 0;
704 #endif /* USE_UTMP || USE_WTMP || USE_LOGIN */
707 ** utmpx utility functions
709 ** These functions manipulate struct utmpx, accounting for system
713 #if defined(USE_UTMPX) || defined (USE_WTMPX)
714 /* build the utmpx structure */
716 set_utmpx_time(struct logininfo *li, struct utmpx *utx)
718 # if defined(HAVE_TV_IN_UTMPX)
719 utx->ut_tv.tv_sec = li->tv_sec;
720 utx->ut_tv.tv_usec = li->tv_usec;
721 # elif defined(HAVE_TIME_IN_UTMPX)
722 utx->ut_time = li->tv_sec;
727 construct_utmpx(struct logininfo *li, struct utmpx *utx)
729 # ifdef HAVE_ADDR_V6_IN_UTMP
730 struct sockaddr_in6 *sa6;
732 memset(utx, '\0', sizeof(*utx));
734 # ifdef HAVE_ID_IN_UTMPX
735 line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id));
738 /* this is done here to keep utmp constants out of loginrec.h */
741 utx->ut_type = USER_PROCESS;
744 utx->ut_type = DEAD_PROCESS;
747 line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line));
748 set_utmpx_time(li, utx);
749 utx->ut_pid = li->pid;
751 /* strncpy(): Don't necessarily want null termination */
752 strncpy(utx->ut_name, li->username,
753 MIN_SIZEOF(utx->ut_name, li->username));
755 if (li->type == LTYPE_LOGOUT)
759 * These fields are only used when logging in, and are blank
763 # ifdef HAVE_HOST_IN_UTMPX
764 strncpy(utx->ut_host, li->hostname,
765 MIN_SIZEOF(utx->ut_host, li->hostname));
767 # ifdef HAVE_ADDR_IN_UTMPX
768 /* this is just a 32-bit IP address */
769 if (li->hostaddr.sa.sa_family == AF_INET)
770 utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
772 # ifdef HAVE_ADDR_V6_IN_UTMP
773 /* this is just a 128-bit IPv6 address */
774 if (li->hostaddr.sa.sa_family == AF_INET6) {
775 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa);
776 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16);
777 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
778 ut->ut_addr_v6[0] = ut->ut_addr_v6[3];
779 ut->ut_addr_v6[1] = 0;
780 ut->ut_addr_v6[2] = 0;
781 ut->ut_addr_v6[3] = 0;
785 # ifdef HAVE_SYSLEN_IN_UTMPX
786 /* ut_syslen is the length of the utx_host string */
787 utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host));
790 #endif /* USE_UTMPX || USE_WTMPX */
793 ** Low-level utmp functions
796 /* FIXME: (ATL) utmp_write_direct needs testing */
799 /* if we can, use pututline() etc. */
800 # if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \
801 defined(HAVE_PUTUTLINE)
802 # define UTMP_USE_LIBRARY
806 /* write a utmp entry with the system's help (pututline() and pals) */
807 # ifdef UTMP_USE_LIBRARY
809 utmp_write_library(struct logininfo *li, struct utmp *ut)
813 # ifdef HAVE_ENDUTENT
818 # else /* UTMP_USE_LIBRARY */
821 * Write a utmp entry direct to the file
822 * This is a slightly modification of code in OpenBSD's login.c
825 utmp_write_direct(struct logininfo *li, struct utmp *ut)
831 /* FIXME: (ATL) ttyslot() needs local implementation */
833 #if defined(HAVE_GETTTYENT)
838 while (NULL != (ty = getttyent())) {
840 if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line)))
846 logit("%s: tty not found", __func__);
851 tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */
853 #endif /* HAVE_GETTTYENT */
855 if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) {
858 pos = (off_t)tty * sizeof(struct utmp);
859 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) {
860 logit("%s: lseek: %s", __func__, strerror(errno));
864 logit("%s: Couldn't seek to tty %d slot in %s",
865 __func__, tty, UTMP_FILE);
869 * Prevent luser from zero'ing out ut_host.
870 * If the new ut_line is empty but the old one is not
871 * and ut_line and ut_name match, preserve the old ut_line.
873 if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) &&
874 (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') &&
875 (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) &&
876 (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0))
877 memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host));
879 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) {
880 logit("%s: lseek: %s", __func__, strerror(errno));
884 logit("%s: Couldn't seek to tty %d slot in %s",
885 __func__, tty, UTMP_FILE);
888 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
889 logit("%s: error writing %s: %s", __func__,
890 UTMP_FILE, strerror(errno));
899 # endif /* UTMP_USE_LIBRARY */
902 utmp_perform_login(struct logininfo *li)
906 construct_utmp(li, &ut);
907 # ifdef UTMP_USE_LIBRARY
908 if (!utmp_write_library(li, &ut)) {
909 logit("%s: utmp_write_library() failed", __func__);
913 if (!utmp_write_direct(li, &ut)) {
914 logit("%s: utmp_write_direct() failed", __func__);
923 utmp_perform_logout(struct logininfo *li)
927 construct_utmp(li, &ut);
928 # ifdef UTMP_USE_LIBRARY
929 if (!utmp_write_library(li, &ut)) {
930 logit("%s: utmp_write_library() failed", __func__);
934 if (!utmp_write_direct(li, &ut)) {
935 logit("%s: utmp_write_direct() failed", __func__);
944 utmp_write_entry(struct logininfo *li)
948 return (utmp_perform_login(li));
951 return (utmp_perform_logout(li));
954 logit("%s: invalid type field", __func__);
958 #endif /* USE_UTMP */
962 ** Low-level utmpx functions
965 /* not much point if we don't want utmpx entries */
968 /* if we have the wherewithall, use pututxline etc. */
969 # if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \
970 defined(HAVE_PUTUTXLINE)
971 # define UTMPX_USE_LIBRARY
975 /* write a utmpx entry with the system's help (pututxline() and pals) */
976 # ifdef UTMPX_USE_LIBRARY
978 utmpx_write_library(struct logininfo *li, struct utmpx *utx)
983 # ifdef HAVE_ENDUTXENT
989 # else /* UTMPX_USE_LIBRARY */
991 /* write a utmp entry direct to the file */
993 utmpx_write_direct(struct logininfo *li, struct utmpx *utx)
995 logit("%s: not implemented!", __func__);
998 # endif /* UTMPX_USE_LIBRARY */
1001 utmpx_perform_login(struct logininfo *li)
1005 construct_utmpx(li, &utx);
1006 # ifdef UTMPX_USE_LIBRARY
1007 if (!utmpx_write_library(li, &utx)) {
1008 logit("%s: utmp_write_library() failed", __func__);
1012 if (!utmpx_write_direct(li, &ut)) {
1013 logit("%s: utmp_write_direct() failed", __func__);
1022 utmpx_perform_logout(struct logininfo *li)
1026 construct_utmpx(li, &utx);
1027 # ifdef HAVE_ID_IN_UTMPX
1028 line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id));
1030 # ifdef HAVE_TYPE_IN_UTMPX
1031 utx.ut_type = DEAD_PROCESS;
1034 # ifdef UTMPX_USE_LIBRARY
1035 utmpx_write_library(li, &utx);
1037 utmpx_write_direct(li, &utx);
1043 utmpx_write_entry(struct logininfo *li)
1047 return (utmpx_perform_login(li));
1049 return (utmpx_perform_logout(li));
1051 logit("%s: invalid type field", __func__);
1055 #endif /* USE_UTMPX */
1059 ** Low-level wtmp functions
1065 * Write a wtmp entry direct to the end of the file
1066 * This is a slight modification of code in OpenBSD's logwtmp.c
1069 wtmp_write(struct logininfo *li, struct utmp *ut)
1074 if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
1075 logit("%s: problem writing %s: %s", __func__,
1076 WTMP_FILE, strerror(errno));
1079 if (fstat(fd, &buf) == 0)
1080 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
1081 ftruncate(fd, buf.st_size);
1082 logit("%s: problem writing %s: %s", __func__,
1083 WTMP_FILE, strerror(errno));
1091 wtmp_perform_login(struct logininfo *li)
1095 construct_utmp(li, &ut);
1096 return (wtmp_write(li, &ut));
1101 wtmp_perform_logout(struct logininfo *li)
1105 construct_utmp(li, &ut);
1106 return (wtmp_write(li, &ut));
1111 wtmp_write_entry(struct logininfo *li)
1115 return (wtmp_perform_login(li));
1117 return (wtmp_perform_logout(li));
1119 logit("%s: invalid type field", __func__);
1126 * Notes on fetching login data from wtmp/wtmpx
1128 * Logouts are usually recorded with (amongst other things) a blank
1129 * username on a given tty line. However, some systems (HP-UX is one)
1130 * leave all fields set, but change the ut_type field to DEAD_PROCESS.
1132 * Since we're only looking for logins here, we know that the username
1133 * must be set correctly. On systems that leave it in, we check for
1134 * ut_type==USER_PROCESS (indicating a login.)
1136 * Portability: Some systems may set something other than USER_PROCESS
1137 * to indicate a login process. I don't know of any as I write. Also,
1138 * it's possible that some systems may both leave the username in
1139 * place and not have ut_type.
1142 /* return true if this wtmp entry indicates a login */
1144 wtmp_islogin(struct logininfo *li, struct utmp *ut)
1146 if (strncmp(li->username, ut->ut_name,
1147 MIN_SIZEOF(li->username, ut->ut_name)) == 0) {
1148 # ifdef HAVE_TYPE_IN_UTMP
1149 if (ut->ut_type & USER_PROCESS)
1159 wtmp_get_entry(struct logininfo *li)
1165 /* Clear the time entries in our logininfo */
1166 li->tv_sec = li->tv_usec = 0;
1168 if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) {
1169 logit("%s: problem opening %s: %s", __func__,
1170 WTMP_FILE, strerror(errno));
1173 if (fstat(fd, &st) != 0) {
1174 logit("%s: couldn't stat %s: %s", __func__,
1175 WTMP_FILE, strerror(errno));
1180 /* Seek to the start of the last struct utmp */
1181 if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) {
1182 /* Looks like we've got a fresh wtmp file */
1188 if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) {
1189 logit("%s: read of %s failed: %s", __func__,
1190 WTMP_FILE, strerror(errno));
1194 if ( wtmp_islogin(li, &ut) ) {
1197 * We've already checked for a time in struct
1198 * utmp, in login_getlast()
1200 # ifdef HAVE_TIME_IN_UTMP
1201 li->tv_sec = ut.ut_time;
1203 # if HAVE_TV_IN_UTMP
1204 li->tv_sec = ut.ut_tv.tv_sec;
1207 line_fullname(li->line, ut.ut_line,
1208 MIN_SIZEOF(li->line, ut.ut_line));
1209 # ifdef HAVE_HOST_IN_UTMP
1210 strlcpy(li->hostname, ut.ut_host,
1211 MIN_SIZEOF(li->hostname, ut.ut_host));
1215 /* Seek back 2 x struct utmp */
1216 if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) {
1217 /* We've found the start of the file, so quit */
1223 /* We found an entry. Tidy up and return */
1227 # endif /* USE_WTMP */
1231 ** Low-level wtmpx functions
1236 * Write a wtmpx entry direct to the end of the file
1237 * This is a slight modification of code in OpenBSD's logwtmp.c
1240 wtmpx_write(struct logininfo *li, struct utmpx *utx)
1242 #ifndef HAVE_UPDWTMPX
1246 if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
1247 logit("%s: problem opening %s: %s", __func__,
1248 WTMPX_FILE, strerror(errno));
1252 if (fstat(fd, &buf) == 0)
1253 if (atomicio(vwrite, fd, utx, sizeof(*utx)) != sizeof(*utx)) {
1254 ftruncate(fd, buf.st_size);
1255 logit("%s: problem writing %s: %s", __func__,
1256 WTMPX_FILE, strerror(errno));
1263 updwtmpx(WTMPX_FILE, utx);
1270 wtmpx_perform_login(struct logininfo *li)
1274 construct_utmpx(li, &utx);
1275 return (wtmpx_write(li, &utx));
1280 wtmpx_perform_logout(struct logininfo *li)
1284 construct_utmpx(li, &utx);
1285 return (wtmpx_write(li, &utx));
1290 wtmpx_write_entry(struct logininfo *li)
1294 return (wtmpx_perform_login(li));
1296 return (wtmpx_perform_logout(li));
1298 logit("%s: invalid type field", __func__);
1303 /* Please see the notes above wtmp_islogin() for information about the
1304 next two functions */
1306 /* Return true if this wtmpx entry indicates a login */
1308 wtmpx_islogin(struct logininfo *li, struct utmpx *utx)
1310 if (strncmp(li->username, utx->ut_name,
1311 MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) {
1312 # ifdef HAVE_TYPE_IN_UTMPX
1313 if (utx->ut_type == USER_PROCESS)
1324 wtmpx_get_entry(struct logininfo *li)
1330 /* Clear the time entries */
1331 li->tv_sec = li->tv_usec = 0;
1333 if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) {
1334 logit("%s: problem opening %s: %s", __func__,
1335 WTMPX_FILE, strerror(errno));
1338 if (fstat(fd, &st) != 0) {
1339 logit("%s: couldn't stat %s: %s", __func__,
1340 WTMPX_FILE, strerror(errno));
1345 /* Seek to the start of the last struct utmpx */
1346 if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) {
1347 /* probably a newly rotated wtmpx file */
1353 if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) {
1354 logit("%s: read of %s failed: %s", __func__,
1355 WTMPX_FILE, strerror(errno));
1360 * Logouts are recorded as a blank username on a particular
1361 * line. So, we just need to find the username in struct utmpx
1363 if (wtmpx_islogin(li, &utx)) {
1365 # if defined(HAVE_TV_IN_UTMPX)
1366 li->tv_sec = utx.ut_tv.tv_sec;
1367 # elif defined(HAVE_TIME_IN_UTMPX)
1368 li->tv_sec = utx.ut_time;
1370 line_fullname(li->line, utx.ut_line, sizeof(li->line));
1371 # if defined(HAVE_HOST_IN_UTMPX)
1372 strlcpy(li->hostname, utx.ut_host,
1373 MIN_SIZEOF(li->hostname, utx.ut_host));
1377 if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) {
1386 #endif /* USE_WTMPX */
1389 ** Low-level libutil login() functions
1394 syslogin_perform_login(struct logininfo *li)
1398 ut = xmalloc(sizeof(*ut));
1399 construct_utmp(li, ut);
1407 syslogin_perform_logout(struct logininfo *li)
1410 char line[UT_LINESIZE];
1412 (void)line_stripname(line, li->line, sizeof(line));
1415 logit("%s: logout() returned an error", __func__);
1416 # ifdef HAVE_LOGWTMP
1418 logwtmp(line, "", "");
1420 /* FIXME: (ATL - if the need arises) What to do if we have
1421 * login, but no logout? what if logout but no logwtmp? All
1422 * routines are in libutil so they should all be there,
1429 syslogin_write_entry(struct logininfo *li)
1433 return (syslogin_perform_login(li));
1435 return (syslogin_perform_logout(li));
1437 logit("%s: Invalid type field", __func__);
1441 #endif /* USE_LOGIN */
1443 /* end of file log-syslogin.c */
1446 ** Low-level lastlog functions
1455 lastlog_construct(struct logininfo *li, struct lastlog *last)
1457 /* clear the structure */
1458 memset(last, '\0', sizeof(*last));
1460 line_stripname(last->ll_line, li->line, sizeof(last->ll_line));
1461 strlcpy(last->ll_host, li->hostname,
1462 MIN_SIZEOF(last->ll_host, li->hostname));
1463 last->ll_time = li->tv_sec;
1467 lastlog_filetype(char *filename)
1471 if (stat(LASTLOG_FILE, &st) != 0) {
1472 logit("%s: Couldn't stat %s: %s", __func__,
1473 LASTLOG_FILE, strerror(errno));
1476 if (S_ISDIR(st.st_mode))
1478 else if (S_ISREG(st.st_mode))
1485 /* open the file (using filemode) and seek to the login entry */
1487 lastlog_openseek(struct logininfo *li, int *fd, int filemode)
1491 char lastlog_file[1024];
1493 type = lastlog_filetype(LASTLOG_FILE);
1496 strlcpy(lastlog_file, LASTLOG_FILE,
1497 sizeof(lastlog_file));
1500 snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s",
1501 LASTLOG_FILE, li->username);
1504 logit("%s: %.100s is not a file or directory!", __func__,
1509 *fd = open(lastlog_file, filemode, 0600);
1511 debug("%s: Couldn't open %s: %s", __func__,
1512 lastlog_file, strerror(errno));
1516 if (type == LL_FILE) {
1517 /* find this uid's offset in the lastlog file */
1518 offset = (off_t) ((long)li->uid * sizeof(struct lastlog));
1520 if (lseek(*fd, offset, SEEK_SET) != offset) {
1521 logit("%s: %s->lseek(): %s", __func__,
1522 lastlog_file, strerror(errno));
1531 lastlog_perform_login(struct logininfo *li)
1533 struct lastlog last;
1536 /* create our struct lastlog */
1537 lastlog_construct(li, &last);
1539 if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT))
1542 /* write the entry */
1543 if (atomicio(vwrite, fd, &last, sizeof(last)) != sizeof(last)) {
1545 logit("%s: Error writing to %s: %s", __func__,
1546 LASTLOG_FILE, strerror(errno));
1555 lastlog_write_entry(struct logininfo *li)
1559 return (lastlog_perform_login(li));
1561 logit("%s: Invalid type field", __func__);
1567 lastlog_populate_entry(struct logininfo *li, struct lastlog *last)
1569 line_fullname(li->line, last->ll_line, sizeof(li->line));
1570 strlcpy(li->hostname, last->ll_host,
1571 MIN_SIZEOF(li->hostname, last->ll_host));
1572 li->tv_sec = last->ll_time;
1576 lastlog_get_entry(struct logininfo *li)
1578 struct lastlog last;
1581 if (!lastlog_openseek(li, &fd, O_RDONLY))
1584 ret = atomicio(read, fd, &last, sizeof(last));
1589 memset(&last, '\0', sizeof(last));
1592 lastlog_populate_entry(li, &last);
1595 error("%s: Error reading from %s: %s", __func__,
1596 LASTLOG_FILE, strerror(errno));
1599 error("%s: Error reading from %s: Expecting %d, got %d",
1600 __func__, LASTLOG_FILE, (int)sizeof(last), ret);
1607 #endif /* USE_LASTLOG */
1611 * Logs failed login attempts in _PATH_BTMP if that exists.
1612 * The most common login failure is to give password instead of username.
1613 * So the _PATH_BTMP file checked for the correct permission, so that
1614 * only root can read it.
1618 record_failed_login(const char *username, const char *hostname,
1623 struct sockaddr_storage from;
1624 socklen_t fromlen = sizeof(from);
1625 struct sockaddr_in *a4;
1626 struct sockaddr_in6 *a6;
1632 if ((fd = open(_PATH_BTMP, O_WRONLY | O_APPEND)) < 0) {
1633 debug("Unable to open the btmp file %s: %s", _PATH_BTMP,
1637 if (fstat(fd, &fst) < 0) {
1638 logit("%s: fstat of %s failed: %s", __func__, _PATH_BTMP,
1642 if((fst.st_mode & (S_IRWXG | S_IRWXO)) || (fst.st_uid != 0)){
1643 logit("Excess permission or bad ownership on file %s",
1648 memset(&ut, 0, sizeof(ut));
1649 /* strncpy because we don't necessarily want nul termination */
1650 strncpy(ut.ut_user, username, sizeof(ut.ut_user));
1651 strlcpy(ut.ut_line, "ssh:notty", sizeof(ut.ut_line));
1654 ut.ut_time = t; /* ut_time is not always a time_t */
1655 ut.ut_type = LOGIN_PROCESS;
1656 ut.ut_pid = getpid();
1658 /* strncpy because we don't necessarily want nul termination */
1659 strncpy(ut.ut_host, hostname, sizeof(ut.ut_host));
1661 if (packet_connection_is_on_socket() &&
1662 getpeername(packet_get_connection_in(),
1663 (struct sockaddr *)&from, &fromlen) == 0) {
1664 ipv64_normalise_mapped(&from, &fromlen);
1665 if (from.ss_family == AF_INET) {
1666 a4 = (struct sockaddr_in *)&from;
1667 memcpy(&ut.ut_addr, &(a4->sin_addr),
1668 MIN_SIZEOF(ut.ut_addr, a4->sin_addr));
1670 #ifdef HAVE_ADDR_V6_IN_UTMP
1671 if (from.ss_family == AF_INET6) {
1672 a6 = (struct sockaddr_in6 *)&from;
1673 memcpy(&ut.ut_addr_v6, &(a6->sin6_addr),
1674 MIN_SIZEOF(ut.ut_addr_v6, a6->sin6_addr));
1679 if (atomicio(vwrite, fd, &ut, sizeof(ut)) != sizeof(ut))
1680 error("Failed to write to %s: %s", _PATH_BTMP,
1686 #endif /* USE_BTMP */