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+/*
+ * Copyright (c) 2000 Andre Lucas. All rights reserved.
+ * Portions copyright (c) 1998 Todd C. Miller
+ * Portions copyright (c) 1996 Jason Downs
+ * Portions copyright (c) 1996 Theo de Raadt
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * The btmp logging code is derived from login.c from util-linux and is under
+ * the the following license:
+ *
+ * Copyright (c) 1980, 1987, 1988 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley. The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+
+/**
+ ** loginrec.c: platform-independent login recording and lastlog retrieval
+ **/
+
+/*
+ * The new login code explained
+ * ============================
+ *
+ * This code attempts to provide a common interface to login recording
+ * (utmp and friends) and last login time retrieval.
+ *
+ * Its primary means of achieving this is to use 'struct logininfo', a
+ * union of all the useful fields in the various different types of
+ * system login record structures one finds on UNIX variants.
+ *
+ * We depend on autoconf to define which recording methods are to be
+ * used, and which fields are contained in the relevant data structures
+ * on the local system. Many C preprocessor symbols affect which code
+ * gets compiled here.
+ *
+ * The code is designed to make it easy to modify a particular
+ * recording method, without affecting other methods nor requiring so
+ * many nested conditional compilation blocks as were commonplace in
+ * the old code.
+ *
+ * For login recording, we try to use the local system's libraries as
+ * these are clearly most likely to work correctly. For utmp systems
+ * this usually means login() and logout() or setutent() etc., probably
+ * in libutil, along with logwtmp() etc. On these systems, we fall back
+ * to writing the files directly if we have to, though this method
+ * requires very thorough testing so we do not corrupt local auditing
+ * information. These files and their access methods are very system
+ * specific indeed.
+ *
+ * For utmpx systems, the corresponding library functions are
+ * setutxent() etc. To the author's knowledge, all utmpx systems have
+ * these library functions and so no direct write is attempted. If such
+ * a system exists and needs support, direct analogues of the [uw]tmp
+ * code should suffice.
+ *
+ * Retrieving the time of last login ('lastlog') is in some ways even
+ * more problemmatic than login recording. Some systems provide a
+ * simple table of all users which we seek based on uid and retrieve a
+ * relatively standard structure. Others record the same information in
+ * a directory with a separate file, and others don't record the
+ * information separately at all. For systems in the latter category,
+ * we look backwards in the wtmp or wtmpx file for the last login entry
+ * for our user. Naturally this is slower and on busy systems could
+ * incur a significant performance penalty.
+ *
+ * Calling the new code
+ * --------------------
+ *
+ * In OpenSSH all login recording and retrieval is performed in
+ * login.c. Here you'll find working examples. Also, in the logintest.c
+ * program there are more examples.
+ *
+ * Internal handler calling method
+ * -------------------------------
+ *
+ * When a call is made to login_login() or login_logout(), both
+ * routines set a struct logininfo flag defining which action (log in,
+ * or log out) is to be taken. They both then call login_write(), which
+ * calls whichever of the many structure-specific handlers autoconf
+ * selects for the local system.
+ *
+ * The handlers themselves handle system data structure specifics. Both
+ * struct utmp and struct utmpx have utility functions (see
+ * construct_utmp*()) to try to make it simpler to add extra systems
+ * that introduce new features to either structure.
+ *
+ * While it may seem terribly wasteful to replicate so much similar
+ * code for each method, experience has shown that maintaining code to
+ * write both struct utmp and utmpx in one function, whilst maintaining
+ * support for all systems whether they have library support or not, is
+ * a difficult and time-consuming task.
+ *
+ * Lastlog support proceeds similarly. Functions login_get_lastlog()
+ * (and its OpenSSH-tuned friend login_get_lastlog_time()) call
+ * getlast_entry(), which tries one of three methods to find the last
+ * login time. It uses local system lastlog support if it can,
+ * otherwise it tries wtmp or wtmpx before giving up and returning 0,
+ * meaning "tilt".
+ *
+ * Maintenance
+ * -----------
+ *
+ * In many cases it's possible to tweak autoconf to select the correct
+ * methods for a particular platform, either by improving the detection
+ * code (best), or by presetting DISABLE_<method> or CONF_<method>_FILE
+ * symbols for the platform.
+ *
+ * Use logintest to check which symbols are defined before modifying
+ * configure.ac and loginrec.c. (You have to build logintest yourself
+ * with 'make logintest' as it's not built by default.)
+ *
+ * Otherwise, patches to the specific method(s) are very helpful!
+ */
+
+#include "includes.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#ifdef HAVE_SYS_TIME_H
+# include <sys/time.h>
+#endif
+
+#include <netinet/in.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#ifdef HAVE_PATHS_H
+# include <paths.h>
+#endif
+#include <pwd.h>
+#include <stdarg.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "xmalloc.h"
+#include "sshkey.h"
+#include "hostfile.h"
+#include "ssh.h"
+#include "loginrec.h"
+#include "log.h"
+#include "atomicio.h"
+#include "packet.h"
+#include "canohost.h"
+#include "auth.h"
+#include "sshbuf.h"
+#include "ssherr.h"
+
+#ifdef HAVE_UTIL_H
+# include <util.h>
+#endif
+
+/**
+ ** prototypes for helper functions in this file
+ **/
+
+#if HAVE_UTMP_H
+void set_utmp_time(struct logininfo *li, struct utmp *ut);
+void construct_utmp(struct logininfo *li, struct utmp *ut);
+#endif
+
+#ifdef HAVE_UTMPX_H
+void set_utmpx_time(struct logininfo *li, struct utmpx *ut);
+void construct_utmpx(struct logininfo *li, struct utmpx *ut);
+#endif
+
+int utmp_write_entry(struct logininfo *li);
+int utmpx_write_entry(struct logininfo *li);
+int wtmp_write_entry(struct logininfo *li);
+int wtmpx_write_entry(struct logininfo *li);
+int lastlog_write_entry(struct logininfo *li);
+int syslogin_write_entry(struct logininfo *li);
+
+int getlast_entry(struct logininfo *li);
+int lastlog_get_entry(struct logininfo *li);
+int utmpx_get_entry(struct logininfo *li);
+int wtmp_get_entry(struct logininfo *li);
+int wtmpx_get_entry(struct logininfo *li);
+
+extern struct sshbuf *loginmsg;
+
+/* pick the shortest string */
+#define MIN_SIZEOF(s1,s2) (sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2))
+
+/**
+ ** platform-independent login functions
+ **/
+
+/*
+ * login_login(struct logininfo *) - Record a login
+ *
+ * Call with a pointer to a struct logininfo initialised with
+ * login_init_entry() or login_alloc_entry()
+ *
+ * Returns:
+ * >0 if successful
+ * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
+ */
+int
+login_login(struct logininfo *li)
+{
+ li->type = LTYPE_LOGIN;
+ return (login_write(li));
+}
+
+
+/*
+ * login_logout(struct logininfo *) - Record a logout
+ *
+ * Call as with login_login()
+ *
+ * Returns:
+ * >0 if successful
+ * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
+ */
+int
+login_logout(struct logininfo *li)
+{
+ li->type = LTYPE_LOGOUT;
+ return (login_write(li));
+}
+
+/*
+ * login_get_lastlog_time(int) - Retrieve the last login time
+ *
+ * Retrieve the last login time for the given uid. Will try to use the
+ * system lastlog facilities if they are available, but will fall back
+ * to looking in wtmp/wtmpx if necessary
+ *
+ * Returns:
+ * 0 on failure, or if user has never logged in
+ * Time in seconds from the epoch if successful
+ *
+ * Useful preprocessor symbols:
+ * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog
+ * info
+ * USE_LASTLOG: If set, indicates the presence of system lastlog
+ * facilities. If this and DISABLE_LASTLOG are not set,
+ * try to retrieve lastlog information from wtmp/wtmpx.
+ */
+unsigned int
+login_get_lastlog_time(const uid_t uid)
+{
+ struct logininfo li;
+
+ if (login_get_lastlog(&li, uid))
+ return (li.tv_sec);
+ else
+ return (0);
+}
+
+/*
+ * login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry
+ *
+ * Retrieve a logininfo structure populated (only partially) with
+ * information from the system lastlog data, or from wtmp/wtmpx if no
+ * system lastlog information exists.
+ *
+ * Note this routine must be given a pre-allocated logininfo.
+ *
+ * Returns:
+ * >0: A pointer to your struct logininfo if successful
+ * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
+ */
+struct logininfo *
+login_get_lastlog(struct logininfo *li, const uid_t uid)
+{
+ struct passwd *pw;
+
+ memset(li, '\0', sizeof(*li));
+ li->uid = uid;
+
+ /*
+ * If we don't have a 'real' lastlog, we need the username to
+ * reliably search wtmp(x) for the last login (see
+ * wtmp_get_entry().)
+ */
+ pw = getpwuid(uid);
+ if (pw == NULL)
+ fatal("%s: Cannot find account for uid %ld", __func__,
+ (long)uid);
+
+ if (strlcpy(li->username, pw->pw_name, sizeof(li->username)) >=
+ sizeof(li->username)) {
+ error("%s: username too long (%lu > max %lu)", __func__,
+ (unsigned long)strlen(pw->pw_name),
+ (unsigned long)sizeof(li->username) - 1);
+ return NULL;
+ }
+
+ if (getlast_entry(li))
+ return (li);
+ else
+ return (NULL);
+}
+
+/*
+ * login_alloc_entry(int, char*, char*, char*) - Allocate and initialise
+ * a logininfo structure
+ *
+ * This function creates a new struct logininfo, a data structure
+ * meant to carry the information required to portably record login info.
+ *
+ * Returns a pointer to a newly created struct logininfo. If memory
+ * allocation fails, the program halts.
+ */
+struct
+logininfo *login_alloc_entry(pid_t pid, const char *username,
+ const char *hostname, const char *line)
+{
+ struct logininfo *newli;
+
+ newli = xmalloc(sizeof(*newli));
+ login_init_entry(newli, pid, username, hostname, line);
+ return (newli);
+}
+
+
+/* login_free_entry(struct logininfo *) - free struct memory */
+void
+login_free_entry(struct logininfo *li)
+{
+ free(li);
+}
+
+
+/* login_init_entry(struct logininfo *, int, char*, char*, char*)
+ * - initialise a struct logininfo
+ *
+ * Populates a new struct logininfo, a data structure meant to carry
+ * the information required to portably record login info.
+ *
+ * Returns: 1
+ */
+int
+login_init_entry(struct logininfo *li, pid_t pid, const char *username,
+ const char *hostname, const char *line)
+{
+ struct passwd *pw;
+
+ memset(li, 0, sizeof(*li));
+
+ li->pid = pid;
+
+ /* set the line information */
+ if (line)
+ line_fullname(li->line, line, sizeof(li->line));
+
+ if (username) {
+ strlcpy(li->username, username, sizeof(li->username));
+ pw = getpwnam(li->username);
+ if (pw == NULL) {
+ fatal("%s: Cannot find user \"%s\"", __func__,
+ li->username);
+ }
+ li->uid = pw->pw_uid;
+ }
+
+ if (hostname)
+ strlcpy(li->hostname, hostname, sizeof(li->hostname));
+
+ return (1);
+}
+
+/*
+ * login_set_current_time(struct logininfo *) - set the current time
+ *
+ * Set the current time in a logininfo structure. This function is
+ * meant to eliminate the need to deal with system dependencies for
+ * time handling.
+ */
+void
+login_set_current_time(struct logininfo *li)
+{
+ struct timeval tv;
+
+ gettimeofday(&tv, NULL);
+
+ li->tv_sec = tv.tv_sec;
+ li->tv_usec = tv.tv_usec;
+}
+
+/* copy a sockaddr_* into our logininfo */
+void
+login_set_addr(struct logininfo *li, const struct sockaddr *sa,
+ const unsigned int sa_size)
+{
+ unsigned int bufsize = sa_size;
+
+ /* make sure we don't overrun our union */
+ if (sizeof(li->hostaddr) < sa_size)
+ bufsize = sizeof(li->hostaddr);
+
+ memcpy(&li->hostaddr.sa, sa, bufsize);
+}
+
+
+/**
+ ** login_write: Call low-level recording functions based on autoconf
+ ** results
+ **/
+int
+login_write(struct logininfo *li)
+{
+#ifndef HAVE_CYGWIN
+ if (geteuid() != 0) {
+ logit("Attempt to write login records by non-root user (aborting)");
+ return (1);
+ }
+#endif
+
+ /* set the timestamp */
+ login_set_current_time(li);
+#ifdef USE_LOGIN
+ syslogin_write_entry(li);
+#endif
+#ifdef USE_LASTLOG
+ if (li->type == LTYPE_LOGIN)
+ lastlog_write_entry(li);
+#endif
+#ifdef USE_UTMP
+ utmp_write_entry(li);
+#endif
+#ifdef USE_WTMP
+ wtmp_write_entry(li);
+#endif
+#ifdef USE_UTMPX
+ utmpx_write_entry(li);
+#endif
+#ifdef USE_WTMPX
+ wtmpx_write_entry(li);
+#endif
+#ifdef CUSTOM_SYS_AUTH_RECORD_LOGIN
+ if (li->type == LTYPE_LOGIN &&
+ !sys_auth_record_login(li->username,li->hostname,li->line,
+ &loginmsg))
+ logit("Writing login record failed for %s", li->username);
+#endif
+#ifdef SSH_AUDIT_EVENTS
+ if (li->type == LTYPE_LOGIN)
+ audit_session_open(li);
+ else if (li->type == LTYPE_LOGOUT)
+ audit_session_close(li);
+#endif
+ return (0);
+}
+
+#ifdef LOGIN_NEEDS_UTMPX
+int
+login_utmp_only(struct logininfo *li)
+{
+ li->type = LTYPE_LOGIN;
+ login_set_current_time(li);
+# ifdef USE_UTMP
+ utmp_write_entry(li);
+# endif
+# ifdef USE_WTMP
+ wtmp_write_entry(li);
+# endif
+# ifdef USE_UTMPX
+ utmpx_write_entry(li);
+# endif
+# ifdef USE_WTMPX
+ wtmpx_write_entry(li);
+# endif
+ return (0);
+}
+#endif
+
+/**
+ ** getlast_entry: Call low-level functions to retrieve the last login
+ ** time.
+ **/
+
+/* take the uid in li and return the last login time */
+int
+getlast_entry(struct logininfo *li)
+{
+#ifdef USE_LASTLOG
+ return(lastlog_get_entry(li));
+#else /* !USE_LASTLOG */
+#if defined(USE_UTMPX) && defined(HAVE_SETUTXDB) && \
+ defined(UTXDB_LASTLOGIN) && defined(HAVE_GETUTXUSER)
+ return (utmpx_get_entry(li));
+#endif
+
+#if defined(DISABLE_LASTLOG)
+ /* On some systems we shouldn't even try to obtain last login
+ * time, e.g. AIX */
+ return (0);
+# elif defined(USE_WTMP) && \
+ (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP))
+ /* retrieve last login time from utmp */
+ return (wtmp_get_entry(li));
+# elif defined(USE_WTMPX) && \
+ (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX))
+ /* If wtmp isn't available, try wtmpx */
+ return (wtmpx_get_entry(li));
+# else
+ /* Give up: No means of retrieving last login time */
+ return (0);
+# endif /* DISABLE_LASTLOG */
+#endif /* USE_LASTLOG */
+}
+
+
+
+/*
+ * 'line' string utility functions
+ *
+ * These functions process the 'line' string into one of three forms:
+ *
+ * 1. The full filename (including '/dev')
+ * 2. The stripped name (excluding '/dev')
+ * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00
+ * /dev/pts/1 -> ts/1 )
+ *
+ * Form 3 is used on some systems to identify a .tmp.? entry when
+ * attempting to remove it. Typically both addition and removal is
+ * performed by one application - say, sshd - so as long as the choice
+ * uniquely identifies a terminal it's ok.
+ */
+
+
+/*
+ * line_fullname(): add the leading '/dev/' if it doesn't exist make
+ * sure dst has enough space, if not just copy src (ugh)
+ */
+char *
+line_fullname(char *dst, const char *src, u_int dstsize)
+{
+ memset(dst, '\0', dstsize);
+ if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5)))
+ strlcpy(dst, src, dstsize);
+ else {
+ strlcpy(dst, "/dev/", dstsize);
+ strlcat(dst, src, dstsize);
+ }
+ return (dst);
+}
+
+/* line_stripname(): strip the leading '/dev' if it exists, return dst */
+char *
+line_stripname(char *dst, const char *src, int dstsize)
+{
+ memset(dst, '\0', dstsize);
+ if (strncmp(src, "/dev/", 5) == 0)
+ strlcpy(dst, src + 5, dstsize);
+ else
+ strlcpy(dst, src, dstsize);
+ return (dst);
+}
+
+/*
+ * line_abbrevname(): Return the abbreviated (usually four-character)
+ * form of the line (Just use the last <dstsize> characters of the
+ * full name.)
+ *
+ * NOTE: use strncpy because we do NOT necessarily want zero
+ * termination
+ */
+char *
+line_abbrevname(char *dst, const char *src, int dstsize)
+{
+ size_t len;
+
+ memset(dst, '\0', dstsize);
+
+ /* Always skip prefix if present */
+ if (strncmp(src, "/dev/", 5) == 0)
+ src += 5;
+
+#ifdef WITH_ABBREV_NO_TTY
+ if (strncmp(src, "tty", 3) == 0)
+ src += 3;
+#endif
+
+ len = strlen(src);
+
+ if (len > 0) {
+ if (((int)len - dstsize) > 0)
+ src += ((int)len - dstsize);
+
+ /* note: _don't_ change this to strlcpy */
+ strncpy(dst, src, (size_t)dstsize);
+ }
+
+ return (dst);
+}
+
+/**
+ ** utmp utility functions
+ **
+ ** These functions manipulate struct utmp, taking system differences
+ ** into account.
+ **/
+
+#if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN)
+
+/* build the utmp structure */
+void
+set_utmp_time(struct logininfo *li, struct utmp *ut)
+{
+# if defined(HAVE_TV_IN_UTMP)
+ ut->ut_tv.tv_sec = li->tv_sec;
+ ut->ut_tv.tv_usec = li->tv_usec;
+# elif defined(HAVE_TIME_IN_UTMP)
+ ut->ut_time = li->tv_sec;
+# endif
+}
+
+void
+construct_utmp(struct logininfo *li,
+ struct utmp *ut)
+{
+# ifdef HAVE_ADDR_V6_IN_UTMP
+ struct sockaddr_in6 *sa6;
+# endif
+
+ memset(ut, '\0', sizeof(*ut));
+
+ /* First fill out fields used for both logins and logouts */
+
+# ifdef HAVE_ID_IN_UTMP
+ line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id));
+# endif
+
+# ifdef HAVE_TYPE_IN_UTMP
+ /* This is done here to keep utmp constants out of struct logininfo */
+ switch (li->type) {
+ case LTYPE_LOGIN:
+ ut->ut_type = USER_PROCESS;
+ break;
+ case LTYPE_LOGOUT:
+ ut->ut_type = DEAD_PROCESS;
+ break;
+ }
+# endif
+ set_utmp_time(li, ut);
+
+ line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line));
+
+# ifdef HAVE_PID_IN_UTMP
+ ut->ut_pid = li->pid;
+# endif
+
+ /* If we're logging out, leave all other fields blank */
+ if (li->type == LTYPE_LOGOUT)
+ return;
+
+ /*
+ * These fields are only used when logging in, and are blank
+ * for logouts.
+ */
+
+ /* Use strncpy because we don't necessarily want null termination */
+ strncpy(ut->ut_name, li->username,
+ MIN_SIZEOF(ut->ut_name, li->username));
+# ifdef HAVE_HOST_IN_UTMP
+ strncpy(ut->ut_host, li->hostname,
+ MIN_SIZEOF(ut->ut_host, li->hostname));
+# endif
+# ifdef HAVE_ADDR_IN_UTMP
+ /* this is just a 32-bit IP address */
+ if (li->hostaddr.sa.sa_family == AF_INET)
+ ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
+# endif
+# ifdef HAVE_ADDR_V6_IN_UTMP
+ /* this is just a 128-bit IPv6 address */
+ if (li->hostaddr.sa.sa_family == AF_INET6) {
+ sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa);
+ memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16);
+ if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
+ ut->ut_addr_v6[0] = ut->ut_addr_v6[3];
+ ut->ut_addr_v6[1] = 0;
+ ut->ut_addr_v6[2] = 0;
+ ut->ut_addr_v6[3] = 0;
+ }
+ }
+# endif
+}
+#endif /* USE_UTMP || USE_WTMP || USE_LOGIN */
+
+/**
+ ** utmpx utility functions
+ **
+ ** These functions manipulate struct utmpx, accounting for system
+ ** variations.
+ **/
+
+#if defined(USE_UTMPX) || defined (USE_WTMPX)
+/* build the utmpx structure */
+void
+set_utmpx_time(struct logininfo *li, struct utmpx *utx)
+{
+# if defined(HAVE_TV_IN_UTMPX)
+ utx->ut_tv.tv_sec = li->tv_sec;
+ utx->ut_tv.tv_usec = li->tv_usec;
+# elif defined(HAVE_TIME_IN_UTMPX)
+ utx->ut_time = li->tv_sec;
+# endif
+}
+
+void
+construct_utmpx(struct logininfo *li, struct utmpx *utx)
+{
+# ifdef HAVE_ADDR_V6_IN_UTMP
+ struct sockaddr_in6 *sa6;
+# endif
+ memset(utx, '\0', sizeof(*utx));
+
+# ifdef HAVE_ID_IN_UTMPX
+ line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id));
+# endif
+
+ /* this is done here to keep utmp constants out of loginrec.h */
+ switch (li->type) {
+ case LTYPE_LOGIN:
+ utx->ut_type = USER_PROCESS;
+ break;
+ case LTYPE_LOGOUT:
+ utx->ut_type = DEAD_PROCESS;
+ break;
+ }
+ line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line));
+ set_utmpx_time(li, utx);
+ utx->ut_pid = li->pid;
+
+ /* strncpy(): Don't necessarily want null termination */
+ strncpy(utx->ut_user, li->username,
+ MIN_SIZEOF(utx->ut_user, li->username));
+
+ if (li->type == LTYPE_LOGOUT)
+ return;
+
+ /*
+ * These fields are only used when logging in, and are blank
+ * for logouts.
+ */
+
+# ifdef HAVE_HOST_IN_UTMPX
+ strncpy(utx->ut_host, li->hostname,
+ MIN_SIZEOF(utx->ut_host, li->hostname));
+# endif
+# ifdef HAVE_ADDR_IN_UTMPX
+ /* this is just a 32-bit IP address */
+ if (li->hostaddr.sa.sa_family == AF_INET)
+ utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
+# endif
+# ifdef HAVE_ADDR_V6_IN_UTMP
+ /* this is just a 128-bit IPv6 address */
+ if (li->hostaddr.sa.sa_family == AF_INET6) {
+ sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa);
+ memcpy(utx->ut_addr_v6, sa6->sin6_addr.s6_addr, 16);
+ if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
+ utx->ut_addr_v6[0] = utx->ut_addr_v6[3];
+ utx->ut_addr_v6[1] = 0;
+ utx->ut_addr_v6[2] = 0;
+ utx->ut_addr_v6[3] = 0;
+ }
+ }
+# endif
+# ifdef HAVE_SYSLEN_IN_UTMPX
+ /* ut_syslen is the length of the utx_host string */
+ utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host));
+# endif
+}
+#endif /* USE_UTMPX || USE_WTMPX */
+
+/**
+ ** Low-level utmp functions
+ **/
+
+/* FIXME: (ATL) utmp_write_direct needs testing */
+#ifdef USE_UTMP
+
+/* if we can, use pututline() etc. */
+# if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \
+ defined(HAVE_PUTUTLINE)
+# define UTMP_USE_LIBRARY
+# endif
+
+
+/* write a utmp entry with the system's help (pututline() and pals) */
+# ifdef UTMP_USE_LIBRARY
+static int
+utmp_write_library(struct logininfo *li, struct utmp *ut)
+{
+ setutent();
+ pututline(ut);
+# ifdef HAVE_ENDUTENT
+ endutent();
+# endif
+ return (1);
+}
+# else /* UTMP_USE_LIBRARY */
+
+/*
+ * Write a utmp entry direct to the file
+ * This is a slightly modification of code in OpenBSD's login.c
+ */
+static int
+utmp_write_direct(struct logininfo *li, struct utmp *ut)
+{
+ struct utmp old_ut;
+ register int fd;
+ int tty;
+
+ /* FIXME: (ATL) ttyslot() needs local implementation */
+
+#if defined(HAVE_GETTTYENT)
+ struct ttyent *ty;
+
+ tty=0;
+ setttyent();
+ while (NULL != (ty = getttyent())) {
+ tty++;
+ if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line)))
+ break;
+ }
+ endttyent();
+
+ if (NULL == ty) {
+ logit("%s: tty not found", __func__);
+ return (0);
+ }
+#else /* FIXME */
+
+ tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */
+
+#endif /* HAVE_GETTTYENT */
+
+ if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) {
+ off_t pos, ret;
+
+ pos = (off_t)tty * sizeof(struct utmp);
+ if ((ret = lseek(fd, pos, SEEK_SET)) == -1) {
+ logit("%s: lseek: %s", __func__, strerror(errno));
+ close(fd);
+ return (0);
+ }
+ if (ret != pos) {
+ logit("%s: Couldn't seek to tty %d slot in %s",
+ __func__, tty, UTMP_FILE);
+ close(fd);
+ return (0);
+ }
+ /*
+ * Prevent luser from zero'ing out ut_host.
+ * If the new ut_line is empty but the old one is not
+ * and ut_line and ut_name match, preserve the old ut_line.
+ */
+ if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) &&
+ (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') &&
+ (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) &&
+ (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0))
+ memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host));
+
+ if ((ret = lseek(fd, pos, SEEK_SET)) == -1) {
+ logit("%s: lseek: %s", __func__, strerror(errno));
+ close(fd);
+ return (0);
+ }
+ if (ret != pos) {
+ logit("%s: Couldn't seek to tty %d slot in %s",
+ __func__, tty, UTMP_FILE);
+ close(fd);
+ return (0);
+ }
+ if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
+ logit("%s: error writing %s: %s", __func__,
+ UTMP_FILE, strerror(errno));
+ close(fd);
+ return (0);
+ }
+
+ close(fd);
+ return (1);
+ } else {
+ return (0);
+ }
+}
+# endif /* UTMP_USE_LIBRARY */
+
+static int
+utmp_perform_login(struct logininfo *li)
+{
+ struct utmp ut;
+
+ construct_utmp(li, &ut);
+# ifdef UTMP_USE_LIBRARY
+ if (!utmp_write_library(li, &ut)) {
+ logit("%s: utmp_write_library() failed", __func__);
+ return (0);
+ }
+# else
+ if (!utmp_write_direct(li, &ut)) {
+ logit("%s: utmp_write_direct() failed", __func__);
+ return (0);
+ }
+# endif
+ return (1);
+}
+
+
+static int
+utmp_perform_logout(struct logininfo *li)
+{
+ struct utmp ut;
+
+ construct_utmp(li, &ut);
+# ifdef UTMP_USE_LIBRARY
+ if (!utmp_write_library(li, &ut)) {
+ logit("%s: utmp_write_library() failed", __func__);
+ return (0);
+ }
+# else
+ if (!utmp_write_direct(li, &ut)) {
+ logit("%s: utmp_write_direct() failed", __func__);
+ return (0);
+ }
+# endif
+ return (1);
+}
+
+
+int
+utmp_write_entry(struct logininfo *li)
+{
+ switch(li->type) {
+ case LTYPE_LOGIN:
+ return (utmp_perform_login(li));
+
+ case LTYPE_LOGOUT:
+ return (utmp_perform_logout(li));
+
+ default:
+ logit("%s: invalid type field", __func__);
+ return (0);
+ }
+}
+#endif /* USE_UTMP */
+
+
+/**
+ ** Low-level utmpx functions
+ **/
+
+/* not much point if we don't want utmpx entries */
+#ifdef USE_UTMPX
+
+/* if we have the wherewithall, use pututxline etc. */
+# if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \
+ defined(HAVE_PUTUTXLINE)
+# define UTMPX_USE_LIBRARY
+# endif
+
+
+/* write a utmpx entry with the system's help (pututxline() and pals) */
+# ifdef UTMPX_USE_LIBRARY
+static int
+utmpx_write_library(struct logininfo *li, struct utmpx *utx)
+{
+ setutxent();
+ pututxline(utx);
+
+# ifdef HAVE_ENDUTXENT
+ endutxent();
+# endif
+ return (1);
+}
+
+# else /* UTMPX_USE_LIBRARY */
+
+/* write a utmp entry direct to the file */
+static int
+utmpx_write_direct(struct logininfo *li, struct utmpx *utx)
+{
+ logit("%s: not implemented!", __func__);
+ return (0);
+}
+# endif /* UTMPX_USE_LIBRARY */
+
+static int
+utmpx_perform_login(struct logininfo *li)
+{
+ struct utmpx utx;
+
+ construct_utmpx(li, &utx);
+# ifdef UTMPX_USE_LIBRARY
+ if (!utmpx_write_library(li, &utx)) {
+ logit("%s: utmp_write_library() failed", __func__);
+ return (0);
+ }
+# else
+ if (!utmpx_write_direct(li, &ut)) {
+ logit("%s: utmp_write_direct() failed", __func__);
+ return (0);
+ }
+# endif
+ return (1);
+}
+
+
+static int
+utmpx_perform_logout(struct logininfo *li)
+{
+ struct utmpx utx;
+
+ construct_utmpx(li, &utx);
+# ifdef HAVE_ID_IN_UTMPX
+ line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id));
+# endif
+# ifdef HAVE_TYPE_IN_UTMPX
+ utx.ut_type = DEAD_PROCESS;
+# endif
+
+# ifdef UTMPX_USE_LIBRARY
+ utmpx_write_library(li, &utx);
+# else
+ utmpx_write_direct(li, &utx);
+# endif
+ return (1);
+}
+
+int
+utmpx_write_entry(struct logininfo *li)
+{
+ switch(li->type) {
+ case LTYPE_LOGIN:
+ return (utmpx_perform_login(li));
+ case LTYPE_LOGOUT:
+ return (utmpx_perform_logout(li));
+ default:
+ logit("%s: invalid type field", __func__);
+ return (0);
+ }
+}
+#endif /* USE_UTMPX */
+
+
+/**
+ ** Low-level wtmp functions
+ **/
+
+#ifdef USE_WTMP
+
+/*
+ * Write a wtmp entry direct to the end of the file
+ * This is a slight modification of code in OpenBSD's logwtmp.c
+ */
+static int
+wtmp_write(struct logininfo *li, struct utmp *ut)
+{
+ struct stat buf;
+ int fd, ret = 1;
+
+ if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
+ logit("%s: problem writing %s: %s", __func__,
+ WTMP_FILE, strerror(errno));
+ return (0);
+ }
+ if (fstat(fd, &buf) == 0)
+ if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
+ ftruncate(fd, buf.st_size);
+ logit("%s: problem writing %s: %s", __func__,
+ WTMP_FILE, strerror(errno));
+ ret = 0;
+ }
+ close(fd);
+ return (ret);
+}
+
+static int
+wtmp_perform_login(struct logininfo *li)
+{
+ struct utmp ut;
+
+ construct_utmp(li, &ut);
+ return (wtmp_write(li, &ut));
+}
+
+
+static int
+wtmp_perform_logout(struct logininfo *li)
+{
+ struct utmp ut;
+
+ construct_utmp(li, &ut);
+ return (wtmp_write(li, &ut));
+}
+
+
+int
+wtmp_write_entry(struct logininfo *li)
+{
+ switch(li->type) {
+ case LTYPE_LOGIN:
+ return (wtmp_perform_login(li));
+ case LTYPE_LOGOUT:
+ return (wtmp_perform_logout(li));
+ default:
+ logit("%s: invalid type field", __func__);
+ return (0);
+ }
+}
+
+
+/*
+ * Notes on fetching login data from wtmp/wtmpx
+ *
+ * Logouts are usually recorded with (amongst other things) a blank
+ * username on a given tty line. However, some systems (HP-UX is one)
+ * leave all fields set, but change the ut_type field to DEAD_PROCESS.
+ *
+ * Since we're only looking for logins here, we know that the username
+ * must be set correctly. On systems that leave it in, we check for
+ * ut_type==USER_PROCESS (indicating a login.)
+ *
+ * Portability: Some systems may set something other than USER_PROCESS
+ * to indicate a login process. I don't know of any as I write. Also,
+ * it's possible that some systems may both leave the username in
+ * place and not have ut_type.
+ */
+
+/* return true if this wtmp entry indicates a login */
+static int
+wtmp_islogin(struct logininfo *li, struct utmp *ut)
+{
+ if (strncmp(li->username, ut->ut_name,
+ MIN_SIZEOF(li->username, ut->ut_name)) == 0) {
+# ifdef HAVE_TYPE_IN_UTMP
+ if (ut->ut_type & USER_PROCESS)
+ return (1);
+# else
+ return (1);
+# endif
+ }
+ return (0);
+}
+
+int
+wtmp_get_entry(struct logininfo *li)
+{
+ struct stat st;
+ struct utmp ut;
+ int fd, found = 0;
+
+ /* Clear the time entries in our logininfo */
+ li->tv_sec = li->tv_usec = 0;
+
+ if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) {
+ logit("%s: problem opening %s: %s", __func__,
+ WTMP_FILE, strerror(errno));
+ return (0);
+ }
+ if (fstat(fd, &st) != 0) {
+ logit("%s: couldn't stat %s: %s", __func__,
+ WTMP_FILE, strerror(errno));
+ close(fd);
+ return (0);
+ }
+
+ /* Seek to the start of the last struct utmp */
+ if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) {
+ /* Looks like we've got a fresh wtmp file */
+ close(fd);
+ return (0);
+ }
+
+ while (!found) {
+ if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) {
+ logit("%s: read of %s failed: %s", __func__,
+ WTMP_FILE, strerror(errno));
+ close (fd);
+ return (0);
+ }
+ if (wtmp_islogin(li, &ut) ) {
+ found = 1;
+ /*
+ * We've already checked for a time in struct
+ * utmp, in login_getlast()
+ */
+# ifdef HAVE_TIME_IN_UTMP
+ li->tv_sec = ut.ut_time;
+# else
+# if HAVE_TV_IN_UTMP
+ li->tv_sec = ut.ut_tv.tv_sec;
+# endif
+# endif
+ line_fullname(li->line, ut.ut_line,
+ MIN_SIZEOF(li->line, ut.ut_line));
+# ifdef HAVE_HOST_IN_UTMP
+ strlcpy(li->hostname, ut.ut_host,
+ MIN_SIZEOF(li->hostname, ut.ut_host));
+# endif
+ continue;
+ }
+ /* Seek back 2 x struct utmp */
+ if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) {
+ /* We've found the start of the file, so quit */
+ close(fd);
+ return (0);
+ }
+ }
+
+ /* We found an entry. Tidy up and return */
+ close(fd);
+ return (1);
+}
+# endif /* USE_WTMP */
+
+
+/**
+ ** Low-level wtmpx functions
+ **/
+
+#ifdef USE_WTMPX
+/*
+ * Write a wtmpx entry direct to the end of the file
+ * This is a slight modification of code in OpenBSD's logwtmp.c
+ */
+static int
+wtmpx_write(struct logininfo *li, struct utmpx *utx)
+{
+#ifndef HAVE_UPDWTMPX
+ struct stat buf;
+ int fd, ret = 1;
+
+ if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
+ logit("%s: problem opening %s: %s", __func__,
+ WTMPX_FILE, strerror(errno));
+ return (0);
+ }
+
+ if (fstat(fd, &buf) == 0)
+ if (atomicio(vwrite, fd, utx, sizeof(*utx)) != sizeof(*utx)) {
+ ftruncate(fd, buf.st_size);
+ logit("%s: problem writing %s: %s", __func__,
+ WTMPX_FILE, strerror(errno));
+ ret = 0;
+ }
+ close(fd);
+
+ return (ret);
+#else
+ updwtmpx(WTMPX_FILE, utx);
+ return (1);
+#endif
+}
+
+
+static int
+wtmpx_perform_login(struct logininfo *li)
+{
+ struct utmpx utx;
+
+ construct_utmpx(li, &utx);
+ return (wtmpx_write(li, &utx));
+}
+
+
+static int
+wtmpx_perform_logout(struct logininfo *li)
+{
+ struct utmpx utx;
+
+ construct_utmpx(li, &utx);
+ return (wtmpx_write(li, &utx));
+}
+
+
+int
+wtmpx_write_entry(struct logininfo *li)
+{
+ switch(li->type) {
+ case LTYPE_LOGIN:
+ return (wtmpx_perform_login(li));
+ case LTYPE_LOGOUT:
+ return (wtmpx_perform_logout(li));
+ default:
+ logit("%s: invalid type field", __func__);
+ return (0);
+ }
+}
+
+/* Please see the notes above wtmp_islogin() for information about the
+ next two functions */
+
+/* Return true if this wtmpx entry indicates a login */
+static int
+wtmpx_islogin(struct logininfo *li, struct utmpx *utx)
+{
+ if (strncmp(li->username, utx->ut_user,
+ MIN_SIZEOF(li->username, utx->ut_user)) == 0 ) {
+# ifdef HAVE_TYPE_IN_UTMPX
+ if (utx->ut_type == USER_PROCESS)
+ return (1);
+# else
+ return (1);
+# endif
+ }
+ return (0);
+}
+
+
+int
+wtmpx_get_entry(struct logininfo *li)
+{
+ struct stat st;
+ struct utmpx utx;
+ int fd, found=0;
+
+ /* Clear the time entries */
+ li->tv_sec = li->tv_usec = 0;
+
+ if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) {
+ logit("%s: problem opening %s: %s", __func__,
+ WTMPX_FILE, strerror(errno));
+ return (0);
+ }
+ if (fstat(fd, &st) != 0) {
+ logit("%s: couldn't stat %s: %s", __func__,
+ WTMPX_FILE, strerror(errno));
+ close(fd);
+ return (0);
+ }
+
+ /* Seek to the start of the last struct utmpx */
+ if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) {
+ /* probably a newly rotated wtmpx file */
+ close(fd);
+ return (0);
+ }
+
+ while (!found) {
+ if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) {
+ logit("%s: read of %s failed: %s", __func__,
+ WTMPX_FILE, strerror(errno));
+ close (fd);
+ return (0);
+ }
+ /*
+ * Logouts are recorded as a blank username on a particular
+ * line. So, we just need to find the username in struct utmpx
+ */
+ if (wtmpx_islogin(li, &utx)) {
+ found = 1;
+# if defined(HAVE_TV_IN_UTMPX)
+ li->tv_sec = utx.ut_tv.tv_sec;
+# elif defined(HAVE_TIME_IN_UTMPX)
+ li->tv_sec = utx.ut_time;
+# endif
+ line_fullname(li->line, utx.ut_line, sizeof(li->line));
+# if defined(HAVE_HOST_IN_UTMPX)
+ strlcpy(li->hostname, utx.ut_host,
+ MIN_SIZEOF(li->hostname, utx.ut_host));
+# endif
+ continue;
+ }
+ if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) {
+ close(fd);
+ return (0);
+ }
+ }
+
+ close(fd);
+ return (1);
+}
+#endif /* USE_WTMPX */
+
+/**
+ ** Low-level libutil login() functions
+ **/
+
+#ifdef USE_LOGIN
+static int
+syslogin_perform_login(struct logininfo *li)
+{
+ struct utmp *ut;
+
+ ut = xmalloc(sizeof(*ut));
+ construct_utmp(li, ut);
+ login(ut);
+ free(ut);
+
+ return (1);
+}
+
+static int
+syslogin_perform_logout(struct logininfo *li)
+{
+# ifdef HAVE_LOGOUT
+ char line[UT_LINESIZE];
+
+ (void)line_stripname(line, li->line, sizeof(line));
+
+ if (!logout(line))
+ logit("%s: logout() returned an error", __func__);
+# ifdef HAVE_LOGWTMP
+ else
+ logwtmp(line, "", "");
+# endif
+ /* FIXME: (ATL - if the need arises) What to do if we have
+ * login, but no logout? what if logout but no logwtmp? All
+ * routines are in libutil so they should all be there,
+ * but... */
+# endif
+ return (1);
+}
+
+int
+syslogin_write_entry(struct logininfo *li)
+{
+ switch (li->type) {
+ case LTYPE_LOGIN:
+ return (syslogin_perform_login(li));
+ case LTYPE_LOGOUT:
+ return (syslogin_perform_logout(li));
+ default:
+ logit("%s: Invalid type field", __func__);
+ return (0);
+ }
+}
+#endif /* USE_LOGIN */
+
+/* end of file log-syslogin.c */
+
+/**
+ ** Low-level lastlog functions
+ **/
+
+#ifdef USE_LASTLOG
+
+#if !defined(LASTLOG_WRITE_PUTUTXLINE) || !defined(HAVE_GETLASTLOGXBYNAME)
+/* open the file (using filemode) and seek to the login entry */
+static int
+lastlog_openseek(struct logininfo *li, int *fd, int filemode)
+{
+ off_t offset;
+ char lastlog_file[1024];
+ struct stat st;
+
+ if (stat(LASTLOG_FILE, &st) != 0) {
+ logit("%s: Couldn't stat %s: %s", __func__,
+ LASTLOG_FILE, strerror(errno));
+ return (0);
+ }
+ if (S_ISDIR(st.st_mode)) {
+ snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s",
+ LASTLOG_FILE, li->username);
+ } else if (S_ISREG(st.st_mode)) {
+ strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file));
+ } else {
+ logit("%s: %.100s is not a file or directory!", __func__,
+ LASTLOG_FILE);
+ return (0);
+ }
+
+ *fd = open(lastlog_file, filemode, 0600);
+ if (*fd < 0) {
+ debug("%s: Couldn't open %s: %s", __func__,
+ lastlog_file, strerror(errno));
+ return (0);
+ }
+
+ if (S_ISREG(st.st_mode)) {
+ /* find this uid's offset in the lastlog file */
+ offset = (off_t) ((u_long)li->uid * sizeof(struct lastlog));
+
+ if (lseek(*fd, offset, SEEK_SET) != offset) {
+ logit("%s: %s->lseek(): %s", __func__,
+ lastlog_file, strerror(errno));
+ close(*fd);
+ return (0);
+ }
+ }
+
+ return (1);
+}
+#endif /* !LASTLOG_WRITE_PUTUTXLINE || !HAVE_GETLASTLOGXBYNAME */
+
+#ifdef LASTLOG_WRITE_PUTUTXLINE
+int
+lastlog_write_entry(struct logininfo *li)
+{
+ switch(li->type) {
+ case LTYPE_LOGIN:
+ return 1; /* lastlog written by pututxline */
+ default:
+ logit("lastlog_write_entry: Invalid type field");
+ return 0;
+ }
+}
+#else /* LASTLOG_WRITE_PUTUTXLINE */
+int
+lastlog_write_entry(struct logininfo *li)
+{
+ struct lastlog last;
+ int fd;
+
+ switch(li->type) {
+ case LTYPE_LOGIN:
+ /* create our struct lastlog */
+ memset(&last, '\0', sizeof(last));
+ line_stripname(last.ll_line, li->line, sizeof(last.ll_line));
+ strlcpy(last.ll_host, li->hostname,
+ MIN_SIZEOF(last.ll_host, li->hostname));
+ last.ll_time = li->tv_sec;
+
+ if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT))
+ return (0);
+
+ /* write the entry */
+ if (atomicio(vwrite, fd, &last, sizeof(last)) != sizeof(last)) {
+ close(fd);
+ logit("%s: Error writing to %s: %s", __func__,
+ LASTLOG_FILE, strerror(errno));
+ return (0);
+ }
+
+ close(fd);
+ return (1);
+ default:
+ logit("%s: Invalid type field", __func__);
+ return (0);
+ }
+}
+#endif /* LASTLOG_WRITE_PUTUTXLINE */
+
+#ifdef HAVE_GETLASTLOGXBYNAME
+int
+lastlog_get_entry(struct logininfo *li)
+{
+ struct lastlogx l, *ll;
+
+ if ((ll = getlastlogxbyname(li->username, &l)) == NULL) {
+ memset(&l, '\0', sizeof(l));
+ ll = &l;
+ }
+ line_fullname(li->line, ll->ll_line, sizeof(li->line));
+ strlcpy(li->hostname, ll->ll_host,
+ MIN_SIZEOF(li->hostname, ll->ll_host));
+ li->tv_sec = ll->ll_tv.tv_sec;
+ li->tv_usec = ll->ll_tv.tv_usec;
+ return (1);
+}
+#else /* HAVE_GETLASTLOGXBYNAME */
+int
+lastlog_get_entry(struct logininfo *li)
+{
+ struct lastlog last;
+ int fd, ret;
+
+ if (!lastlog_openseek(li, &fd, O_RDONLY))
+ return (0);
+
+ ret = atomicio(read, fd, &last, sizeof(last));
+ close(fd);
+
+ switch (ret) {
+ case 0:
+ memset(&last, '\0', sizeof(last));
+ /* FALLTHRU */
+ case sizeof(last):
+ line_fullname(li->line, last.ll_line, sizeof(li->line));
+ strlcpy(li->hostname, last.ll_host,
+ MIN_SIZEOF(li->hostname, last.ll_host));
+ li->tv_sec = last.ll_time;
+ return (1);
+ case -1:
+ error("%s: Error reading from %s: %s", __func__,
+ LASTLOG_FILE, strerror(errno));
+ return (0);
+ default:
+ error("%s: Error reading from %s: Expecting %d, got %d",
+ __func__, LASTLOG_FILE, (int)sizeof(last), ret);
+ return (0);
+ }
+
+ /* NOTREACHED */
+ return (0);
+}
+#endif /* HAVE_GETLASTLOGXBYNAME */
+#endif /* USE_LASTLOG */
+
+#if defined(USE_UTMPX) && defined(HAVE_SETUTXDB) && \
+ defined(UTXDB_LASTLOGIN) && defined(HAVE_GETUTXUSER)
+int
+utmpx_get_entry(struct logininfo *li)
+{
+ struct utmpx *utx;
+
+ if (setutxdb(UTXDB_LASTLOGIN, NULL) != 0)
+ return (0);
+ utx = getutxuser(li->username);
+ if (utx == NULL) {
+ endutxent();
+ return (0);
+ }
+
+ line_fullname(li->line, utx->ut_line,
+ MIN_SIZEOF(li->line, utx->ut_line));
+ strlcpy(li->hostname, utx->ut_host,
+ MIN_SIZEOF(li->hostname, utx->ut_host));
+ li->tv_sec = utx->ut_tv.tv_sec;
+ li->tv_usec = utx->ut_tv.tv_usec;
+ endutxent();
+ return (1);
+}
+#endif /* USE_UTMPX && HAVE_SETUTXDB && UTXDB_LASTLOGIN && HAVE_GETUTXUSER */
+
+#ifdef USE_BTMP
+ /*
+ * Logs failed login attempts in _PATH_BTMP if that exists.
+ * The most common login failure is to give password instead of username.
+ * So the _PATH_BTMP file checked for the correct permission, so that
+ * only root can read it.
+ */
+
+void
+record_failed_login(const char *username, const char *hostname,
+ const char *ttyn)
+{
+ int fd;
+ struct utmp ut;
+ struct sockaddr_storage from;
+ socklen_t fromlen = sizeof(from);
+ struct sockaddr_in *a4;
+ struct sockaddr_in6 *a6;
+ time_t t;
+ struct stat fst;
+
+ if (geteuid() != 0)
+ return;
+ if ((fd = open(_PATH_BTMP, O_WRONLY | O_APPEND)) < 0) {
+ debug("Unable to open the btmp file %s: %s", _PATH_BTMP,
+ strerror(errno));
+ return;
+ }
+ if (fstat(fd, &fst) < 0) {
+ logit("%s: fstat of %s failed: %s", __func__, _PATH_BTMP,
+ strerror(errno));
+ goto out;
+ }
+ if((fst.st_mode & (S_IXGRP | S_IRWXO)) || (fst.st_uid != 0)){
+ logit("Excess permission or bad ownership on file %s",
+ _PATH_BTMP);
+ goto out;
+ }
+
+ memset(&ut, 0, sizeof(ut));
+ /* strncpy because we don't necessarily want nul termination */
+ strncpy(ut.ut_user, username, sizeof(ut.ut_user));
+ strlcpy(ut.ut_line, "ssh:notty", sizeof(ut.ut_line));
+
+ time(&t);
+ ut.ut_time = t; /* ut_time is not always a time_t */
+ ut.ut_type = LOGIN_PROCESS;
+ ut.ut_pid = getpid();
+
+ /* strncpy because we don't necessarily want nul termination */
+ strncpy(ut.ut_host, hostname, sizeof(ut.ut_host));
+
+ if (packet_connection_is_on_socket() &&
+ getpeername(packet_get_connection_in(),
+ (struct sockaddr *)&from, &fromlen) == 0) {
+ ipv64_normalise_mapped(&from, &fromlen);
+ if (from.ss_family == AF_INET) {
+ a4 = (struct sockaddr_in *)&from;
+ memcpy(&ut.ut_addr, &(a4->sin_addr),
+ MIN_SIZEOF(ut.ut_addr, a4->sin_addr));
+ }
+#ifdef HAVE_ADDR_V6_IN_UTMP
+ if (from.ss_family == AF_INET6) {
+ a6 = (struct sockaddr_in6 *)&from;
+ memcpy(&ut.ut_addr_v6, &(a6->sin6_addr),
+ MIN_SIZEOF(ut.ut_addr_v6, a6->sin6_addr));
+ }
+#endif
+ }
+
+ if (atomicio(vwrite, fd, &ut, sizeof(ut)) != sizeof(ut))
+ error("Failed to write to %s: %s", _PATH_BTMP,
+ strerror(errno));
+
+out:
+ close(fd);
+}
+#endif /* USE_BTMP */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 09:44:56 +0000