/*- * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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. */ #if 0 static char copyright[] = "@(#) Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994\n\ The Regents of the University of California. All rights reserved.\n"; #endif #ifndef lint #if 0 static char sccsid[] = "@(#)login.c 8.4 (Berkeley) 4/2/94"; #endif static const char rcsid[] = "$FreeBSD$"; #endif /* not lint */ /* * login [ name ] * login -h hostname (for telnetd, etc.) * login -f name (for pre-authenticated login: datakit, xterm, etc.) */ #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 #ifdef USE_PAM #include #include #include #endif /* USE_PAM */ #include "pathnames.h" void badlogin(char *); void checknologin(void); void dolastlog(int); void getloginname(void); void motd(const char *); int rootterm(char *); void sigint(int); void sleepexit(int); void refused(char *,char *,int); char *stypeof(char *); void timedout(int); int login_access(char *, char *); void login_fbtab(char *, uid_t, gid_t); #ifdef USE_PAM static int auth_pam(void); static int export_pam_environment(void); static int ok_to_export(const char *); static pam_handle_t *pamh = NULL; static char **environ_pam; #define PAM_END { \ if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) \ syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); \ if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) \ syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); \ if ((e = pam_end(pamh, e)) != PAM_SUCCESS) \ syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); \ } #endif static int auth_traditional(void); static void usage(void); #define TTYGRPNAME "tty" /* name of group to own ttys */ #define DEFAULT_BACKOFF 3 #define DEFAULT_RETRIES 10 #define DEFAULT_PROMPT "login: " #define DEFAULT_PASSWD_PROMPT "Password:" /* * This bounds the time given to login. Not a define so it can * be patched on machines where it's too small. */ u_int timeout = 300; /* Buffer for signal handling of timeout */ jmp_buf timeout_buf; struct passwd *pwd; int failures; char *term, *envinit[1], *hostname, *tty, *username; const char *passwd_prompt, *prompt; char full_hostname[MAXHOSTNAMELEN]; int main(argc, argv) int argc; char *argv[]; { extern char **environ; struct group *gr; struct stat st; struct utmpx utmp; int rootok, retries, backoff; int ask, ch, cnt, fflag, hflag, pflag, quietlog, rootlogin, rval; int changepass; time_t now, warntime; uid_t uid, euid; gid_t egid; char *p, *ttyn; char tbuf[MAXPATHLEN + 2]; char tname[sizeof(_PATH_TTY) + 10]; const char *shell = NULL; login_cap_t *lc = NULL; int UT_HOSTSIZE = sizeof(utmp.ut_host); int UT_NAMESIZE = sizeof(utmp.ut_user); #ifdef USE_PAM pid_t pid; int e; #endif /* USE_PAM */ (void)signal(SIGQUIT, SIG_IGN); (void)signal(SIGINT, SIG_IGN); (void)signal(SIGHUP, SIG_IGN); if (setjmp(timeout_buf)) { if (failures) badlogin(tbuf); (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout); exit(0); } (void)signal(SIGALRM, timedout); (void)alarm(timeout); (void)setpriority(PRIO_PROCESS, 0, 0); openlog("login", LOG_ODELAY, LOG_AUTH); /* * -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 */ *full_hostname = '\0'; term = NULL; fflag = hflag = pflag = 0; uid = getuid(); euid = geteuid(); egid = getegid(); while ((ch = getopt(argc, argv, "fh:p")) != -1) switch (ch) { case 'f': fflag = 1; break; case 'h': if (uid) errx(1, "-h option: %s", strerror(EPERM)); hflag = 1; if (strlcpy(full_hostname, optarg, sizeof(full_hostname)) >= sizeof(full_hostname)) errx(1, "-h option: %s: exceeds maximum " "hostname size", optarg); trimdomain(optarg, UT_HOSTSIZE); if (strlen(optarg) > UT_HOSTSIZE) { struct addrinfo hints, *res; int ga_err; memset(&hints, 0, sizeof(hints)); hints.ai_family = AF_UNSPEC; ga_err = getaddrinfo(optarg, NULL, &hints, &res); if (ga_err == 0) { char hostbuf[MAXHOSTNAMELEN]; getnameinfo(res->ai_addr, res->ai_addrlen, hostbuf, sizeof(hostbuf), NULL, 0, NI_NUMERICHOST); optarg = strdup(hostbuf); if (optarg == NULL) { syslog(LOG_NOTICE, "strdup(): %m"); sleepexit(1); } } else optarg = "invalid hostname"; if (res != NULL) freeaddrinfo(res); } hostname = optarg; break; case 'p': pflag = 1; break; case '?': default: if (!uid) syslog(LOG_ERR, "invalid flag %c", ch); usage(); } argc -= optind; argv += optind; if (*argv) { username = *argv; ask = 0; } else ask = 1; for (cnt = getdtablesize(); cnt > 2; cnt--) (void)close(cnt); ttyn = ttyname(STDIN_FILENO); if (ttyn == NULL || *ttyn == '\0') { (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY); ttyn = tname; } if ((tty = strrchr(ttyn, '/')) != NULL) ++tty; else tty = ttyn; /* * Get "login-retries" & "login-backoff" from default class */ lc = login_getclass(NULL); prompt = login_getcapstr(lc, "login_prompt", DEFAULT_PROMPT, DEFAULT_PROMPT); passwd_prompt = login_getcapstr(lc, "passwd_prompt", DEFAULT_PASSWD_PROMPT, DEFAULT_PASSWD_PROMPT); retries = login_getcapnum(lc, "login-retries", DEFAULT_RETRIES, DEFAULT_RETRIES); backoff = login_getcapnum(lc, "login-backoff", DEFAULT_BACKOFF, DEFAULT_BACKOFF); login_close(lc); lc = NULL; for (cnt = 0;; ask = 1) { if (ask) { fflag = 0; getloginname(); } rootlogin = 0; rootok = rootterm(tty); /* Default (auth may change) */ 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); } (void)strlcpy(tbuf, username, sizeof(tbuf)); pwd = getpwnam(username); /* * if we have a valid account name, and it doesn't have a * password, or the -f option was specified and the caller * is root or the caller isn't changing their uid, don't * authenticate. */ if (pwd != NULL) { if (pwd->pw_uid == 0) rootlogin = 1; if (fflag && (uid == (uid_t)0 || uid == (uid_t)pwd->pw_uid)) { /* already authenticated */ break; } else if (pwd->pw_passwd[0] == '\0') { if (!rootlogin || rootok) { /* pretend password okay */ rval = 0; goto ttycheck; } } } fflag = 0; (void)setpriority(PRIO_PROCESS, 0, -4); #ifdef USE_PAM /* * Try to authenticate using PAM. If a PAM system error * occurs, perhaps because of a botched configuration, * then fall back to using traditional Unix authentication. */ if ((rval = auth_pam()) == -1) #endif /* USE_PAM */ rval = auth_traditional(); (void)setpriority(PRIO_PROCESS, 0, 0); #ifdef USE_PAM /* * PAM authentication may have changed "pwd" to the * entry for the template user. Check again to see if * this is a root login after all. */ if (pwd != NULL && pwd->pw_uid == 0) rootlogin = 1; #endif /* USE_PAM */ ttycheck: /* * If trying to log in as root without Kerberos, * but with insecure terminal, refuse the login attempt. */ if (pwd && !rval) { if (rootlogin && !rootok) refused(NULL, "NOROOT", 0); else /* valid password & authenticated */ break; } (void)printf("Login incorrect\n"); failures++; /* * we allow up to 'retry' (10) tries, * but after 'backoff' (3) we start backing off */ if (++cnt > backoff) { if (cnt >= retries) { badlogin(username); sleepexit(1); } sleep((u_int)((cnt - backoff) * 5)); } } /* committed to login -- turn off timeout */ (void)alarm((u_int)0); (void)signal(SIGHUP, SIG_DFL); endpwent(); /* * Establish the login class. */ lc = login_getpwclass(pwd); /* if user not super-user, check for disabled logins */ if (!rootlogin) auth_checknologin(lc); quietlog = login_getcapbool(lc, "hushlogin", 0); /* * Switching needed for NFS with root access disabled. * * XXX: This change fails to modify the additional groups for the * process, and as such, may restrict rights normally granted * through those groups. */ (void)setegid(pwd->pw_gid); (void)seteuid(rootlogin ? 0 : pwd->pw_uid); if (!*pwd->pw_dir || chdir(pwd->pw_dir) < 0) { if (login_getcapbool(lc, "requirehome", 0)) refused("Home directory not available", "HOMEDIR", 1); if (chdir("/") < 0) refused("Cannot find root directory", "ROOTDIR", 1); if (!quietlog || *pwd->pw_dir) printf("No home directory.\nLogging in with home = \"/\".\n"); pwd->pw_dir = "/"; } (void)seteuid(euid); (void)setegid(egid); if (!quietlog) quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0; now = time(NULL); #define DEFAULT_WARN (2L * 7L * 86400L) /* Two weeks */ warntime = login_getcaptime(lc, "warnexpire", DEFAULT_WARN, DEFAULT_WARN); if (pwd->pw_expire) { if (now >= pwd->pw_expire) { refused("Sorry -- your account has expired", "EXPIRED", 1); } else if (pwd->pw_expire - now < warntime && !quietlog) (void)printf("Warning: your account expires on %s", ctime(&pwd->pw_expire)); } warntime = login_getcaptime(lc, "warnpassword", DEFAULT_WARN, DEFAULT_WARN); changepass = 0; if (pwd->pw_change) { if (now >= pwd->pw_change) { (void)printf("Sorry -- your password has expired.\n"); changepass = 1; syslog(LOG_INFO, "%s Password expired - forcing change", pwd->pw_name); } else if (pwd->pw_change - now < warntime && !quietlog) (void)printf("Warning: your password expires on %s", ctime(&pwd->pw_change)); } if (lc != NULL) { if (hostname) { struct addrinfo hints, *res; int ga_err; memset(&hints, 0, sizeof(hints)); hints.ai_family = AF_UNSPEC; ga_err = getaddrinfo(full_hostname, NULL, &hints, &res); if (ga_err == 0) { char hostbuf[MAXHOSTNAMELEN]; getnameinfo(res->ai_addr, res->ai_addrlen, hostbuf, sizeof(hostbuf), NULL, 0, NI_NUMERICHOST); if ((optarg = strdup(hostbuf)) == NULL) { syslog(LOG_NOTICE, "strdup(): %m"); sleepexit(1); } } else optarg = NULL; if (res != NULL) freeaddrinfo(res); if (!auth_hostok(lc, full_hostname, optarg)) refused("Permission denied", "HOST", 1); } if (!auth_ttyok(lc, tty)) refused("Permission denied", "TTY", 1); if (!auth_timeok(lc, time(NULL))) refused("Logins not available right now", "TIME", 1); } shell = login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell); if (*pwd->pw_shell == '\0') pwd->pw_shell = _PATH_BSHELL; if (*shell == '\0') /* Not overridden */ shell = pwd->pw_shell; if ((shell = strdup(shell)) == NULL) { syslog(LOG_NOTICE, "strdup(): %m"); sleepexit(1); } #ifdef LOGIN_ACCESS if (login_access(pwd->pw_name, hostname ? full_hostname : tty) == 0) refused("Permission denied", "ACCESS", 1); #endif /* LOGIN_ACCESS */ #if 1 ulog_login(tty, username, hostname); #else /* Nothing else left to fail -- really log in. */ memset((void *)&utmp, 0, sizeof(utmp)); (void)gettimeofday(&utmp.ut_tv, NULL); (void)strncpy(utmp.ut_user, username, sizeof(utmp.ut_user)); if (hostname) (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host)); (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); login(&utmp); #endif dolastlog(quietlog); /* * Set device protections, depending on what terminal the * user is logged in. This feature is used on Suns to give * console users better privacy. */ login_fbtab(tty, pwd->pw_uid, pwd->pw_gid); /* * Clear flags of the tty. None should be set, and when the * user sets them otherwise, this can cause the chown to fail. * Since it isn't clear that flags are useful on character * devices, we just clear them. */ if (chflags(ttyn, 0) && errno != EOPNOTSUPP) syslog(LOG_ERR, "chflags(%s): %m", ttyn); if (chown(ttyn, pwd->pw_uid, (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid)) syslog(LOG_ERR, "chown(%s): %m", ttyn); /* * Preserve TERM if it happens to be already set. */ if ((term = getenv("TERM")) != NULL) { if ((term = strdup(term)) == NULL) { syslog(LOG_NOTICE, "strdup(): %m"); sleepexit(1); } } /* * Exclude cons/vt/ptys only, assume dialup otherwise * TODO: Make dialup tty determination a library call * for consistency (finger etc.) */ if (hostname==NULL && isdialuptty(tty)) syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name); #ifdef LOGALL /* * Syslog each successful login, so we don't have to watch hundreds * of wtmp or lastlogin files. */ if (hostname) syslog(LOG_INFO, "login from %s on %s as %s", full_hostname, tty, pwd->pw_name); else syslog(LOG_INFO, "login on %s as %s", tty, pwd->pw_name); #endif /* * 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", username, tty, full_hostname); else syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", username, tty); } /* * Destroy environment unless user has requested its preservation. * We need to do this before setusercontext() because that may * set or reset some environment variables. */ if (!pflag) environ = envinit; /* * PAM modules might add supplementary groups during pam_setcred(). */ if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETGROUP) != 0) { syslog(LOG_ERR, "setusercontext() failed - exiting"); exit(1); } #ifdef USE_PAM if (pamh) { if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); } /* * Add any environmental variables that the * PAM modules may have set. * Call *after* opening session! */ if (pamh) { environ_pam = pam_getenvlist(pamh); if (environ_pam) export_pam_environment(); } /* * We must fork() before setuid() because we need to call * pam_close_session() as root. */ pid = fork(); if (pid < 0) { err(1, "fork"); PAM_END; exit(0); } else if (pid) { /* parent - wait for child to finish, then cleanup session */ wait(NULL); PAM_END; exit(0); } else { if ((e = pam_end(pamh, 0)) != PAM_SUCCESS) syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); } } #endif /* USE_PAM */ /* * We don't need to be root anymore, so * set the user and session context */ if (setlogin(username) != 0) { syslog(LOG_ERR, "setlogin(%s): %m - exiting", username); exit(1); } if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETALL & ~(LOGIN_SETLOGIN|LOGIN_SETGROUP)) != 0) { syslog(LOG_ERR, "setusercontext() failed - exiting"); exit(1); } (void)setenv("SHELL", pwd->pw_shell, 1); (void)setenv("HOME", pwd->pw_dir, 1); if (term != NULL && *term != '\0') (void)setenv("TERM", term, 1); /* Preset overrides */ else { (void)setenv("TERM", stypeof(tty), 0); /* Fallback doesn't */ } (void)setenv("LOGNAME", username, 1); (void)setenv("USER", username, 1); (void)setenv("PATH", rootlogin ? _PATH_STDPATH : _PATH_DEFPATH, 0); if (!quietlog) { const char *cw; cw = login_getcapstr(lc, "copyright", NULL, NULL); if (cw != NULL && access(cw, F_OK) == 0) motd(cw); else (void)printf("%s\n\t%s %s\n", "Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994", "The Regents of the University of California. ", "All rights reserved."); (void)printf("\n"); cw = login_getcapstr(lc, "welcome", NULL, NULL); if (cw == NULL || access(cw, F_OK) != 0) cw = _PATH_MOTDFILE; motd(cw); cw = getenv("MAIL"); /* $MAIL may have been set by class */ if (cw != NULL) strlcpy(tbuf, cw, sizeof(tbuf)); else 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 " : ""); } login_close(lc); (void)signal(SIGALRM, SIG_DFL); (void)signal(SIGQUIT, SIG_DFL); (void)signal(SIGINT, SIG_DFL); (void)signal(SIGTSTP, SIG_IGN); /* * Login shells have a leading '-' in front of argv[0] */ if (snprintf(tbuf, sizeof(tbuf), "-%s", (p = strrchr(pwd->pw_shell, '/')) ? p + 1 : pwd->pw_shell) >= sizeof(tbuf)) { syslog(LOG_ERR, "user: %s: shell exceeds maximum pathname size", username); errx(1, "shell exceeds maximum pathname size"); } execlp(shell, tbuf, (char *)0); err(1, "%s", shell); } static int auth_traditional() { int rval; char *p; char *ep; char *salt; rval = 1; salt = pwd != NULL ? pwd->pw_passwd : "xx"; p = getpass(passwd_prompt); ep = crypt(p, salt); if (pwd) { if (!p[0] && pwd->pw_passwd[0]) ep = ":"; if (strcmp(ep, pwd->pw_passwd) == 0) rval = 0; } /* clear entered password */ memset(p, 0, strlen(p)); return rval; } #ifdef USE_PAM /* * Attempt to authenticate the user using PAM. Returns 0 if the user is * authenticated, or 1 if not authenticated. If some sort of PAM system * error occurs (e.g., the "/etc/pam.conf" file is missing) then this * function returns -1. This can be used as an indication that we should * fall back to a different authentication mechanism. */ static int auth_pam() { const char *tmpl_user; const void *item; int rval; int e; static struct pam_conv conv = { openpam_ttyconv, NULL }; if ((e = pam_start("login", username, &conv, &pamh)) != PAM_SUCCESS) { syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e)); return -1; } if ((e = pam_set_item(pamh, PAM_TTY, tty)) != PAM_SUCCESS) { syslog(LOG_ERR, "pam_set_item(PAM_TTY): %s", pam_strerror(pamh, e)); return -1; } if (hostname != NULL && (e = pam_set_item(pamh, PAM_RHOST, full_hostname)) != PAM_SUCCESS) { syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", pam_strerror(pamh, e)); return -1; } e = pam_authenticate(pamh, 0); switch (e) { case PAM_SUCCESS: /* * With PAM we support the concept of a "template" * user. The user enters a login name which is * authenticated by PAM, usually via a remote service * such as RADIUS or TACACS+. If authentication * succeeds, a different but related "template" name * is used for setting the credentials, shell, and * home directory. The name the user enters need only * exist on the remote authentication server, but the * template name must be present in the local password * database. * * This is supported by two various mechanisms in the * individual modules. However, from the application's * point of view, the template user is always passed * back as a changed value of the PAM_USER item. */ if ((e = pam_get_item(pamh, PAM_USER, &item)) == PAM_SUCCESS) { tmpl_user = (const char *) item; if (strcmp(username, tmpl_user) != 0) pwd = getpwnam(tmpl_user); } else syslog(LOG_ERR, "Couldn't get PAM_USER: %s", pam_strerror(pamh, e)); rval = 0; break; case PAM_AUTH_ERR: case PAM_USER_UNKNOWN: case PAM_MAXTRIES: rval = 1; break; default: syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); rval = -1; break; } if (rval == 0) { e = pam_acct_mgmt(pamh, 0); if (e == PAM_NEW_AUTHTOK_REQD) { e = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK); if (e != PAM_SUCCESS) { syslog(LOG_ERR, "pam_chauthtok: %s", pam_strerror(pamh, e)); rval = 1; } } else if (e != PAM_SUCCESS) { rval = 1; } } if (rval != 0) { if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); } pamh = NULL; } return rval; } static int export_pam_environment() { char **pp; for (pp = environ_pam; *pp != NULL; pp++) { if (ok_to_export(*pp)) (void) putenv(*pp); free(*pp); } return PAM_SUCCESS; } /* * Sanity checks on PAM environmental variables: * - Make sure there is an '=' in the string. * - Make sure the string doesn't run on too long. * - Do not export certain variables. This list was taken from the * Solaris pam_putenv(3) man page. */ static int ok_to_export(s) const char *s; { static const char *noexport[] = { "SHELL", "HOME", "LOGNAME", "MAIL", "CDPATH", "IFS", "PATH", NULL }; const char **pp; size_t n; if (strlen(s) > 1024 || strchr(s, '=') == NULL) return 0; if (strncmp(s, "LD_", 3) == 0) return 0; for (pp = noexport; *pp != NULL; pp++) { n = strlen(*pp); if (s[n] == '=' && strncmp(s, *pp, n) == 0) return 0; } return 1; } #endif /* USE_PAM */ static void usage() { (void)fprintf(stderr, "usage: login [-fp] [-h hostname] [username]\n"); exit(1); } /* * Allow for authentication style and/or kerberos instance */ #define NBUFSIZ 128 // XXX was UT_NAMESIZE + 64 void getloginname() { int ch; char *p; static char nbuf[NBUFSIZ]; for (;;) { (void)printf("%s", prompt); for (p = nbuf; (ch = getchar()) != '\n'; ) { if (ch == EOF) { badlogin(username); exit(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(ttyn) char *ttyn; { struct ttyent *t; return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE); } volatile int motdinterrupt; void sigint(signo) int signo __unused; { motdinterrupt = 1; } void motd(motdfile) const char *motdfile; { int fd, nchars; sig_t oldint; char tbuf[256]; if ((fd = open(motdfile, O_RDONLY, 0)) < 0) return; motdinterrupt = 0; oldint = signal(SIGINT, sigint); while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0 && !motdinterrupt) (void)write(fileno(stdout), tbuf, nchars); (void)signal(SIGINT, oldint); (void)close(fd); } /* ARGSUSED */ void timedout(signo) int signo; { longjmp(timeout_buf, signo); } void dolastlog(quiet) int quiet; { #if 0 /* XXX not implemented after utmp->utmpx change */ struct lastlog ll; int fd; if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) { (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_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)); if (*ll.ll_host != '\0') (void)printf("from %.*s\n", (int)sizeof(ll.ll_host), ll.ll_host); else (void)printf("on %.*s\n", (int)sizeof(ll.ll_line), ll.ll_line); } (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_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); } else { syslog(LOG_ERR, "cannot open %s: %m", _PATH_LASTLOG); } #endif } void badlogin(name) char *name; { if (failures == 0) return; if (hostname) { syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s", failures, failures > 1 ? "S" : "", full_hostname); syslog(LOG_AUTHPRIV|LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s, %s", failures, failures > 1 ? "S" : "", full_hostname, name); } else { syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s", failures, failures > 1 ? "S" : "", tty); syslog(LOG_AUTHPRIV|LOG_NOTICE, "%d LOGIN FAILURE%s ON %s, %s", failures, failures > 1 ? "S" : "", tty, name); } failures = 0; } #undef UNKNOWN #define UNKNOWN "su" char * stypeof(ttyid) char *ttyid; { struct ttyent *t; if (ttyid != NULL && *ttyid != '\0') { t = getttynam(ttyid); if (t != NULL && t->ty_type != NULL) return (t->ty_type); } return (UNKNOWN); } void refused(msg, rtype, lout) char *msg; char *rtype; int lout; { if (msg != NULL) printf("%s.\n", msg); if (hostname) syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) FROM %s ON TTY %s", pwd->pw_name, rtype, full_hostname, tty); else syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) ON TTY %s", pwd->pw_name, rtype, tty); if (lout) sleepexit(1); } void sleepexit(eval) int eval; { (void)sleep(5); exit(eval); }