/* $OpenBSD: login.c,v 1.55 2004/08/30 23:00:22 millert Exp $ */ /* $NetBSD: login.c,v 1.13 1996/05/15 23:50:16 jtc Exp $ */ /*- * Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994 * The Regents of the University of California. All rights reserved. * * 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. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. */ /*- * Copyright (c) 1995 Berkeley Software Design, Inc. All rights reserved. * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Berkeley Software Design, * Inc. * 4. The name of Berkeley Software Design, Inc. may not be used to endorse * or promote products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN, INC. ``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 BERKELEY SOFTWARE DESIGN, INC. 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. * * BSDI $From: login.c,v 2.28 1999/09/08 22:35:36 prb Exp $ */ #ifndef lint static const char copyright[] = "@(#) Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint #if 0 static const char sccsid[] = "@(#)login.c 8.4 (Berkeley) 4/2/94"; #endif static const char rcsid[] = "$OpenBSD: login.c,v 1.55 2004/08/30 23:00:22 millert Exp $"; #endif /* not lint */ /* * login [ name ] * login -h hostname (for telnetd, etc.) * login -f name (for pre-authenticated login: datakit, xterm, etc.) * login -p (preserve existing environment; for getty) */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pathnames.h" void badlogin(char *); void dolastlog(int); void getloginname(void); void motd(void); void quickexit(int); int rootterm(char *); void sigint(int); void sighup(int); void sleepexit(int); char *stypeof(char *); void timedout(int); int main(int, char **); extern int check_failedlogin(uid_t); extern void log_failedlogin(uid_t, char *, char *, char *); #define TTYGRPNAME "tty" /* name of group to own ttys */ /* * This bounds the time given to login; may be overridden by /etc/login.conf. */ u_int timeout = 300; struct passwd *pwd; login_cap_t *lc = NULL; auth_session_t *as = NULL; int failures; int needbanner = 1; char term[64], *hostname, *tty; char *style; char *username = NULL, *rusername = NULL; extern char **environ; int main(int argc, char *argv[]) { char *domain, *p, *ttyn, *shell, *fullname, *instance; char *lipaddr, *script, *ripaddr, *style, *type, *fqdn; char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10]; char localhost[MAXHOSTNAMELEN], *copyright; int ask, ch, cnt, fflag, pflag, quietlog, rootlogin, lastchance; int error, homeless, needto, authok, tries, backoff; struct addrinfo *ai, hints; struct rlimit cds, scds; quad_t expire, warning; struct utmp utmp; struct group *gr; struct stat st; uid_t uid; openlog("login", LOG_ODELAY, LOG_AUTH); fqdn = lipaddr = ripaddr = fullname = type = NULL; authok = 0; tries = 10; backoff = 3; domain = NULL; if (gethostname(localhost, sizeof(localhost)) < 0) { syslog(LOG_ERR, "couldn't get local hostname: %m"); strlcpy(localhost, "localhost", sizeof(localhost)); } else if ((domain = strchr(localhost, '.'))) { domain++; if (*domain && strchr(domain, '.') == NULL) domain = localhost; } if ((as = auth_open()) == NULL) { syslog(LOG_ERR, "auth_open: %m"); err(1, "unable to initialize BSD authentication"); } auth_setoption(as, "login", "yes"); /* * -p is used by getty to tell login not to destroy the environment * -f is used to skip a second login authentication * -h is used by other servers to pass the name of the remote * host to login so that it may be placed in utmp and wtmp */ fflag = pflag = 0; uid = getuid(); while ((ch = getopt(argc, argv, "fh:pu:L:R:")) != -1) switch (ch) { case 'f': fflag = 1; break; case 'h': if (uid) { warnx("-h option: %s", strerror(EPERM)); quickexit(1); } if ((fqdn = strdup(optarg)) == NULL) { warn(NULL); quickexit(1); } auth_setoption(as, "fqdn", fqdn); if (domain && (p = strchr(optarg, '.')) && strcasecmp(p+1, domain) == 0) *p = 0; hostname = optarg; auth_setoption(as, "hostname", hostname); break; case 'L': if (uid) { warnx("-L option: %s", strerror(EPERM)); quickexit(1); } if (lipaddr) { warnx("duplicate -L option"); quickexit(1); } lipaddr = optarg; memset(&hints, 0, sizeof(hints)); hints.ai_family = PF_UNSPEC; hints.ai_flags = AI_CANONNAME; error = getaddrinfo(lipaddr, NULL, &hints, &ai); if (!error) { strlcpy(localhost, ai->ai_canonname, sizeof(localhost)); freeaddrinfo(ai); } else strlcpy(localhost, lipaddr, sizeof(localhost)); auth_setoption(as, "local_addr", lipaddr); break; case 'p': pflag = 1; break; case 'R': if (uid) { warnx("-R option: %s", strerror(EPERM)); quickexit(1); } if (ripaddr) { warnx("duplicate -R option"); quickexit(1); } ripaddr = optarg; auth_setoption(as, "remote_addr", ripaddr); break; case 'u': if (uid) { warnx("-u option: %s", strerror(EPERM)); quickexit(1); } rusername = optarg; break; default: if (!uid) syslog(LOG_ERR, "invalid flag %c", ch); (void)fprintf(stderr, "usage: login [-fp] [-h hostname] [-L lipaddr] " "[-R ripaddr] [-u username] [user]\n"); quickexit(1); } argc -= optind; argv += optind; if (*argv) { username = *argv; ask = 0; } else ask = 1; /* * If effective user is not root, just run su(1) to emulate login(1). */ if (geteuid() != 0) { char *av[5], **ap; auth_close(as); closelog(); closefrom(STDERR_FILENO + 1); ap = av; *ap++ = _PATH_SU; *ap++ = "-L"; if (!pflag) *ap++ = "-l"; if (!ask) *ap++ = username; *ap = NULL; execv(_PATH_SU, av); warn("unable to exec %s", _PATH_SU); _exit(1); } ttyn = ttyname(STDIN_FILENO); if (ttyn == NULL || *ttyn == '\0') { (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY); ttyn = tname; } if ((tty = strrchr(ttyn, '/'))) ++tty; else tty = ttyn; /* * Since login deals with sensitive information, turn off coredumps. */ if (getrlimit(RLIMIT_CORE, &scds) < 0) { syslog(LOG_ERR, "couldn't get core dump size: %m"); scds.rlim_cur = scds.rlim_max = QUAD_MIN; } cds.rlim_cur = cds.rlim_max = 0; if (setrlimit(RLIMIT_CORE, &cds) < 0) { syslog(LOG_ERR, "couldn't set core dump size to 0: %m"); scds.rlim_cur = scds.rlim_max = QUAD_MIN; } (void)signal(SIGALRM, timedout); if (argc > 1) { needto = 0; (void)alarm(timeout); } else needto = 1; (void)signal(SIGQUIT, SIG_IGN); (void)signal(SIGINT, SIG_IGN); (void)signal(SIGHUP, SIG_IGN); (void)setpriority(PRIO_PROCESS, 0, 0); #ifdef notyet /* XXX - we don't (yet) support per-tty auth stuff */ /* BSDi uses a ttys.conf file but we could just overload /etc/ttys */ /* * Classify the attempt. * By default we use the value in the ttys file. * If there is a classify script we run that as * * classify [-f] [username] */ if (type = getttyauth(tty)) auth_setoption(as, "auth_type", type); #endif /* get the default login class */ if ((lc = login_getclass(0)) == NULL) { /* get the default class */ warnx("Failure to retrieve default class"); quickexit(1); } timeout = (u_int)login_getcapnum(lc, "login-timeout", 300, 300); if ((script = login_getcapstr(lc, "classify", NULL, NULL)) != NULL) { unsetenv("AUTH_TYPE"); unsetenv("REMOTE_NAME"); if (script[0] != '/') { syslog(LOG_ERR, "Invalid classify script: %s", script); warnx("Classification failure"); quickexit(1); } shell = strrchr(script, '/') + 1; auth_setstate(as, AUTH_OKAY); auth_call(as, script, shell, fflag ? "-f" : username, fflag ? username : 0, (char *)0); if (!(auth_getstate(as) & AUTH_ALLOW)) quickexit(1); auth_setenv(as); if ((p = getenv("AUTH_TYPE")) != NULL && strncmp(p, "auth-", 5) == 0) type = p; if ((p = getenv("REMOTE_NAME")) != NULL) hostname = p; /* * we may have changed some values, reset them */ auth_clroptions(as); if (type) auth_setoption(as, "auth_type", type); if (fqdn) auth_setoption(as, "fqdn", fqdn); if (hostname) auth_setoption(as, "hostname", hostname); if (lipaddr) auth_setoption(as, "local_addr", lipaddr); if (ripaddr) auth_setoption(as, "remote_addr", ripaddr); } /* * Request the things like the approval script print things * to stdout (in particular, the nologins files) */ auth_setitem(as, AUTHV_INTERACTIVE, "True"); for (cnt = 0;; ask = 1) { /* * Clean up our current authentication session. * Options are not cleared so we need to clear any * we might set below. */ auth_clean(as); auth_clroption(as, "style"); auth_clroption(as, "lastchance"); lastchance = 0; if (ask) { fflag = 0; getloginname(); } if (needto) { needto = 0; alarm(timeout); } if ((style = strchr(username, ':')) != NULL) *style++ = '\0'; if (fullname) free(fullname); if (auth_setitem(as, AUTHV_NAME, username) < 0 || (fullname = strdup(username)) == NULL) { syslog(LOG_ERR, "%m"); warn(NULL); quickexit(1); } rootlogin = 0; if ((instance = strchr(username, '/')) != NULL) { if (strncmp(instance + 1, "root", 4) == 0) rootlogin = 1; *instance++ = '\0'; } else instance = ""; if (strlen(username) > UT_NAMESIZE) username[UT_NAMESIZE] = '\0'; /* * Note if trying multiple user names; log failures for * previous user name, but don't bother logging one failure * for nonexistent name (mistyped username). */ if (failures && strcmp(tbuf, username)) { if (failures > (pwd ? 0 : 1)) badlogin(tbuf); failures = 0; } (void)strlcpy(tbuf, username, sizeof(tbuf)); if ((pwd = getpwnam(username)) != NULL && auth_setpwd(as, pwd) < 0) { syslog(LOG_ERR, "%m"); warn(NULL); quickexit(1); } lc = login_getclass(pwd ? pwd->pw_class : NULL); if (!lc) goto failed; style = login_getstyle(lc, style, type); if (!style) goto failed; /* * We allow "login-tries" attempts to login but start * slowing down after "login-backoff" attempts. */ tries = (int)login_getcapnum(lc, "login-tries", 10, 10); backoff = (int)login_getcapnum(lc, "login-backoff", 3, 3); /* * Turn off the fflag if we have an an invalid user * or we are not root and we are trying to change uids. */ if (!pwd || (uid && uid != pwd->pw_uid)) fflag = 0; if (pwd && pwd->pw_uid == 0) rootlogin = 1; /* * If we do not have the force flag authenticate the user */ if (!fflag) { lastchance = login_getcaptime(lc, "password-dead", 0, 0) != 0; if (lastchance) auth_setoption(as, "lastchance", "yes"); /* * Once we start asking for a password * we want to log a failure on a hup. */ signal(SIGHUP, sighup); auth_verify(as, style, NULL, lc->lc_class, NULL); authok = auth_getstate(as); /* * If their password expired and it has not been * too long since then, give the user one last * chance to change their password */ if ((authok & AUTH_PWEXPIRED) && lastchance) { authok = AUTH_OKAY; } else lastchance = 0; if ((authok & AUTH_ALLOW) == 0) goto failed; if (auth_setoption(as, "style", style) < 0) { syslog(LOG_ERR, "%m"); warn(NULL); quickexit(1); } } /* * explicitly reject users without password file entries */ if (pwd == NULL) goto failed; /* * If trying to log in as root on an insecure terminal, * refuse the login attempt unless the authentication * style explicitly says a root login is okay. */ if (pwd && rootlogin && !rootterm(tty)) goto failed; if (fflag) { type = 0; style = "forced"; } break; failed: if (authok & AUTH_SILENT) quickexit(0); if (rootlogin && !rootterm(tty)) { warnx("%s login refused on this terminal.", fullname); if (hostname) syslog(LOG_NOTICE, "LOGIN %s REFUSED FROM %s%s%s ON TTY %s", fullname, rusername ? rusername : "", rusername ? "@" : "", hostname, tty); else syslog(LOG_NOTICE, "LOGIN %s REFUSED ON TTY %s", fullname, tty); } else { if (!as || (p = auth_getvalue(as, "errormsg")) == NULL) p = "Login incorrect"; (void)printf("%s\n", p); } failures++; if (pwd) log_failedlogin(pwd->pw_uid, hostname, rusername, tty); /* * By default, we allow 10 tries, but after 3 we start * backing off to slow down password guessers. */ if (++cnt > backoff) { if (cnt >= tries) { badlogin(username); sleepexit(1); } sleep((u_int)((cnt - backoff) * tries / 2)); } } /* committed to login -- turn off timeout */ (void)alarm(0); endpwent(); shell = login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell); if (*shell == '\0') shell = _PATH_BSHELL; else if (strlen(shell) >= MAXPATHLEN) { syslog(LOG_ERR, "shell path too long: %s", shell); warnx("invalid shell"); quickexit(1); } /* Destroy environment unless user has requested its preservation. */ if (!pflag) { if ((environ = calloc(1, sizeof (char *))) == NULL) err(1, "calloc"); } else { char **cpp, **cpp2; for (cpp2 = cpp = environ; *cpp; cpp++) { if (strncmp(*cpp, "LD_", 3) && strncmp(*cpp, "ENV=", 4) && strncmp(*cpp, "BASH_ENV=", 9) && strncmp(*cpp, "IFS=", 4)) *cpp2++ = *cpp; } *cpp2 = 0; } /* Note: setusercontext(3) will set PATH */ if (setenv("HOME", pwd->pw_dir, 1) == -1 || setenv("SHELL", shell, 1) == -1) { warn("unable to setenv()"); quickexit(1); } if (term[0] == '\0') (void)strlcpy(term, stypeof(tty), sizeof(term)); if (setenv("TERM", term, 0) == -1 || setenv("LOGNAME", pwd->pw_name, 1) == -1 || setenv("USER", pwd->pw_name, 1) == -1) { warn("unable to setenv()"); quickexit(1); } if (hostname) { if (setenv("REMOTEHOST", hostname, 1) == -1) { warn("unable to setenv()"); quickexit(1); } } if (rusername) { if (setenv("REMOTEUSER", rusername, 1) == -1) { warn("unable to setenv()"); quickexit(1); } } if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETPATH)) { warn("unable to set user context"); quickexit(1); } auth_setenv(as); /* if user not super-user, check for disabled logins */ if (!rootlogin) auth_checknologin(lc); setegid(pwd->pw_gid); seteuid(pwd->pw_uid); homeless = chdir(pwd->pw_dir); if (homeless) { if (login_getcapbool(lc, "requirehome", 0)) { (void)printf("No home directory %s!\n", pwd->pw_dir); quickexit(1); } if (chdir("/")) quickexit(0); } quietlog = ((strcmp(pwd->pw_shell, "/sbin/nologin") == 0) || login_getcapbool(lc, "hushlogin", 0) || (access(_PATH_HUSHLOGIN, F_OK) == 0)); seteuid(0); setegid(0); /* XXX use a saved gid instead? */ if ((p = auth_getvalue(as, "warnmsg")) != NULL) (void)printf("WARNING: %s\n\n", p); expire = auth_check_expire(as); if (expire < 0) { (void)printf("Sorry -- your account has expired.\n"); quickexit(1); } else if (expire > 0 && !quietlog) { warning = login_getcaptime(lc, "expire-warn", 2 * DAYSPERWEEK * SECSPERDAY, 2 * DAYSPERWEEK * SECSPERDAY); if (expire < warning) (void)printf("Warning: your account expires on %s", ctime(&pwd->pw_expire)); } /* Nothing else left to fail -- really log in. */ (void)signal(SIGHUP, SIG_DFL); memset(&utmp, 0, sizeof(utmp)); (void)time(&utmp.ut_time); (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name)); if (hostname) (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host)); (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); login(&utmp); if (!quietlog) (void)check_failedlogin(pwd->pw_uid); dolastlog(quietlog); login_fbtab(tty, pwd->pw_uid, pwd->pw_gid); (void)chown(ttyn, pwd->pw_uid, (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid); /* If fflag is on, assume caller/authenticator has logged root login. */ if (rootlogin && fflag == 0) { if (hostname) syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s%s%s", username, tty, rusername ? rusername : "", rusername ? "@" : "", hostname); else syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", username, tty); } if (!quietlog) { if ((copyright = login_getcapstr(lc, "copyright", NULL, NULL)) != NULL) auth_cat(copyright); motd(); (void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name); if (stat(tbuf, &st) == 0 && st.st_size != 0) (void)printf("You have %smail.\n", (st.st_mtime > st.st_atime) ? "new " : ""); } (void)signal(SIGALRM, SIG_DFL); (void)signal(SIGQUIT, SIG_DFL); (void)signal(SIGHUP, SIG_DFL); (void)signal(SIGINT, SIG_DFL); (void)signal(SIGTSTP, SIG_IGN); tbuf[0] = '-'; (void)strlcpy(tbuf + 1, (p = strrchr(shell, '/')) ? p + 1 : shell, sizeof(tbuf) - 1); if ((scds.rlim_cur != QUAD_MIN || scds.rlim_max != QUAD_MIN) && setrlimit(RLIMIT_CORE, &scds) < 0) syslog(LOG_ERR, "couldn't reset core dump size: %m"); if (lastchance) (void)printf("WARNING: Your password has expired." " You must change your password, now!\n"); if (setusercontext(lc, pwd, rootlogin ? 0 : pwd->pw_uid, LOGIN_SETALL & ~LOGIN_SETPATH) < 0) { warn("unable to set user context"); quickexit(1); } if (homeless) { (void)printf("No home directory %s!\n", pwd->pw_dir); (void)printf("Logging in with home = \"/\".\n"); (void)setenv("HOME", "/", 1); } if (auth_approval(as, lc, NULL, "login") == 0) { if (auth_getstate(as) & AUTH_EXPIRED) (void)printf("Sorry -- your account has expired.\n"); else (void)printf("approval failure\n"); quickexit(1); } /* * The last thing we do is discard all of the open file descriptors. * Last because the C library may have some open. */ closefrom(STDERR_FILENO + 1); /* * Close the authentication session, make sure it is marked * as okay so no files are removed. */ auth_setstate(as, AUTH_OKAY); auth_close(as); execlp(shell, tbuf, (char *)NULL); err(1, "%s", shell); } /* * Allow for a '.' and 16 characters for any instance as well as * space for a ':' and 16 charcters defining the authentication type. */ #define NBUFSIZ (UT_NAMESIZE + 1 + 16 + 1 + 16) void getloginname(void) { static char nbuf[NBUFSIZ], *p; int ch; for (;;) { (void)printf("login: "); for (p = nbuf; (ch = getchar()) != '\n'; ) { if (ch == EOF) { badlogin(username); quickexit(0); } if (p < nbuf + (NBUFSIZ - 1)) *p++ = ch; } if (p > nbuf) { if (nbuf[0] == '-') (void)fprintf(stderr, "login names may not start with '-'.\n"); else { *p = '\0'; username = nbuf; break; } } } } int rootterm(char *ttyn) { struct ttyent *t; /* XXX - stash output of getttynam() elsewhere */ return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE); } void motd(void) { char tbuf[8192], *motd; int fd, nchars; struct sigaction sa, osa; motd = login_getcapstr(lc, "welcome", _PATH_MOTDFILE, _PATH_MOTDFILE); if ((fd = open(motd, O_RDONLY, 0)) < 0) return; memset(&sa, 0, sizeof(sa)); sa.sa_handler = sigint; sigemptyset(&sa.sa_mask); sa.sa_flags = 0; /* don't set SA_RESTART */ (void)sigaction(SIGINT, &sa, &osa); /* read and spew motd until EOF, error, or SIGINT */ while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0 && write(STDOUT_FILENO, tbuf, nchars) == nchars) ; (void)sigaction(SIGINT, &osa, NULL); (void)close(fd); } /* ARGSUSED */ void sigint(int signo) { return; /* just interrupt syscall */ } /* ARGSUSED */ void timedout(int signo) { char warn[1024]; snprintf(warn, sizeof warn, "Login timed out after %d seconds\n", timeout); write(STDERR_FILENO, warn, strlen(warn)); if (username) badlogin(username); _exit(0); } void dolastlog(int quiet) { struct lastlog ll; int fd; if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) { (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), SEEK_SET); if (!quiet) { if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) && ll.ll_time != 0) { (void)printf("Last login: %.*s ", 24-5, (char *)ctime(&ll.ll_time)); (void)printf("on %.*s", (int)sizeof(ll.ll_line), ll.ll_line); if (*ll.ll_host != '\0') (void)printf(" from %.*s", (int)sizeof(ll.ll_host), ll.ll_host); (void)putchar('\n'); } (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), SEEK_SET); } memset((void *)&ll, 0, sizeof(ll)); (void)time(&ll.ll_time); (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); if (hostname) (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); (void)write(fd, (char *)&ll, sizeof(ll)); (void)close(fd); } } void badlogin(char *name) { struct syslog_data sdata = SYSLOG_DATA_INIT; if (failures == 0) return; if (hostname) { syslog_r(LOG_NOTICE, &sdata, "%d LOGIN FAILURE%s FROM %s%s%s", failures, failures > 1 ? "S" : "", rusername ? rusername : "", rusername ? "@" : "", hostname); syslog_r(LOG_AUTHPRIV|LOG_NOTICE, &sdata, "%d LOGIN FAILURE%s FROM %s%s%s, %s", failures, failures > 1 ? "S" : "", rusername ? rusername : "", rusername ? "@" : "", hostname, name); } else { syslog_r(LOG_NOTICE, &sdata, "%d LOGIN FAILURE%s ON %s", failures, failures > 1 ? "S" : "", tty); syslog_r(LOG_AUTHPRIV|LOG_NOTICE, &sdata, "%d LOGIN FAILURE%s ON %s, %s", failures, failures > 1 ? "S" : "", tty, name); } } #undef UNKNOWN #define UNKNOWN "su" char * stypeof(char *ttyid) { struct ttyent *t; return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : login_getcapstr(lc, "term", UNKNOWN, UNKNOWN)); } void sleepexit(int eval) { auth_close(as); (void)sleep(5); exit(eval); } void quickexit(int eval) { if (as) auth_close(as); exit(eval); } void sighup(int signum) { if (username) badlogin(username); _exit(0); }