diff options
Diffstat (limited to 'usr.bin/login/login.c')
| -rw-r--r-- | usr.bin/login/login.c | 979 |
1 files changed, 0 insertions, 979 deletions
diff --git a/usr.bin/login/login.c b/usr.bin/login/login.c deleted file mode 100644 index 549e015..0000000 --- a/usr.bin/login/login.c +++ /dev/null @@ -1,979 +0,0 @@ -/*- - * Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994 - * The Regents of the University of California. All rights reserved. - * Copyright (c) 2002 Networks Associates Technologies, Inc. - * All rights reserved. - * - * Portions of this software were developed for the FreeBSD Project by - * ThinkSec AS and NAI Labs, the Security Research Division of Network - * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 - * ("CBOSS"), as part of the DARPA CHATS research program. - * - * 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 -#ifndef lint -static char sccsid[] = "@(#)login.c 8.4 (Berkeley) 4/2/94"; -#endif -#endif - -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -/* - * login [ name ] - * login -h hostname (for telnetd, etc.) - * login -f name (for pre-authenticated login: datakit, xterm, etc.) - */ - -#include <sys/copyright.h> -#include <sys/param.h> -#include <sys/file.h> -#include <sys/stat.h> -#include <sys/time.h> -#include <sys/resource.h> -#include <sys/wait.h> - -#include <err.h> -#include <errno.h> -#include <grp.h> -#include <libutil.h> -#include <login_cap.h> -#include <pwd.h> -#include <setjmp.h> -#include <signal.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <syslog.h> -#include <ttyent.h> -#include <unistd.h> - -#include <security/pam_appl.h> -#include <security/openpam.h> - -#include "login.h" -#include "pathnames.h" - -static int auth_pam(void); -static void bail(int, int); -static int export(const char *); -static void export_pam_environment(void); -static int motd(const char *); -static void badlogin(char *); -static char *getloginname(void); -static void pam_syslog(const char *); -static void pam_cleanup(void); -static void refused(const char *, const char *, int); -static const char *stypeof(char *); -static void sigint(int); -static void timedout(int); -static void usage(void); - -#define TTYGRPNAME "tty" /* group to own ttys */ -#define DEFAULT_BACKOFF 3 -#define DEFAULT_RETRIES 10 -#define DEFAULT_PROMPT "login: " -#define DEFAULT_PASSWD_PROMPT "Password:" -#define TERM_UNKNOWN "su" -#define DEFAULT_WARN (2L * 7L * 86400L) /* Two weeks */ -#define NO_SLEEP_EXIT 0 -#define SLEEP_EXIT 5 - -/* - * This bounds the time given to login. Not a define so it can - * be patched on machines where it's too small. - */ -static u_int timeout = 300; - -/* Buffer for signal handling of timeout */ -static jmp_buf timeout_buf; - -struct passwd *pwd; -static int failures; - -static char *envinit[1]; /* empty environment list */ - -/* - * Command line flags and arguments - */ -static int fflag; /* -f: do not perform authentication */ -static int hflag; /* -h: login from remote host */ -static char *hostname; /* hostname from command line */ -static int pflag; /* -p: preserve environment */ - -/* - * User name - */ -static char *username; /* user name */ -static char *olduser; /* previous user name */ - -/* - * Prompts - */ -static char default_prompt[] = DEFAULT_PROMPT; -static const char *prompt; -static char default_passwd_prompt[] = DEFAULT_PASSWD_PROMPT; -static const char *passwd_prompt; - -static char *tty; - -/* - * PAM data - */ -static pam_handle_t *pamh = NULL; -static struct pam_conv pamc = { openpam_ttyconv, NULL }; -static int pam_err; -static int pam_silent = PAM_SILENT; -static int pam_cred_established; -static int pam_session_established; - -int -main(int argc, char *argv[]) -{ - struct group *gr; - struct stat st; - int retries, backoff; - int ask, ch, cnt, quietlog, rootlogin, rval; - uid_t uid, euid; - gid_t egid; - char *term; - char *p, *ttyn; - char tname[sizeof(_PATH_TTY) + 10]; - char *arg0; - const char *tp; - const char *shell = NULL; - login_cap_t *lc = NULL; - login_cap_t *lc_user = NULL; - pid_t pid; -#ifdef USE_BSM_AUDIT - char auditsuccess = 1; -#endif - - (void)signal(SIGQUIT, SIG_IGN); - (void)signal(SIGINT, SIG_IGN); - (void)signal(SIGHUP, SIG_IGN); - if (setjmp(timeout_buf)) { - if (failures) - badlogin(username); - (void)fprintf(stderr, "Login timed out after %d seconds\n", - timeout); - bail(NO_SLEEP_EXIT, 0); - } - (void)signal(SIGALRM, timedout); - (void)alarm(timeout); - (void)setpriority(PRIO_PROCESS, 0, 0); - - openlog("login", LOG_ODELAY, LOG_AUTH); - - 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 != 0) - errx(1, "-h option: %s", strerror(EPERM)); - if (strlen(optarg) >= MAXHOSTNAMELEN) - errx(1, "-h option: %s: exceeds maximum " - "hostname size", optarg); - hflag = 1; - hostname = optarg; - break; - case 'p': - pflag = 1; - break; - case '?': - default: - if (uid == 0) - syslog(LOG_ERR, "invalid flag %c", ch); - usage(); - } - argc -= optind; - argv += optind; - - if (argc > 0) { - username = strdup(*argv); - if (username == NULL) - err(1, "strdup()"); - ask = 0; - } else { - ask = 1; - } - - setproctitle("-%s", getprogname()); - - for (cnt = getdtablesize(); cnt > 2; cnt--) - (void)close(cnt); - - /* - * Get current TTY - */ - 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; - - /* - * Try to authenticate the user until we succeed or time out. - */ - for (cnt = 0;; ask = 1) { - if (ask) { - fflag = 0; - if (olduser != NULL) - free(olduser); - olduser = username; - username = getloginname(); - } - rootlogin = 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(olduser, username) != 0) { - if (failures > (pwd ? 0 : 1)) - badlogin(olduser); - } - - /* - * Load the PAM policy and set some variables - */ - pam_err = pam_start("login", username, &pamc, &pamh); - if (pam_err != PAM_SUCCESS) { - pam_syslog("pam_start()"); -#ifdef USE_BSM_AUDIT - au_login_fail("PAM Error", 1); -#endif - bail(NO_SLEEP_EXIT, 1); - } - pam_err = pam_set_item(pamh, PAM_TTY, tty); - if (pam_err != PAM_SUCCESS) { - pam_syslog("pam_set_item(PAM_TTY)"); -#ifdef USE_BSM_AUDIT - au_login_fail("PAM Error", 1); -#endif - bail(NO_SLEEP_EXIT, 1); - } - pam_err = pam_set_item(pamh, PAM_RHOST, hostname); - if (pam_err != PAM_SUCCESS) { - pam_syslog("pam_set_item(PAM_RHOST)"); -#ifdef USE_BSM_AUDIT - au_login_fail("PAM Error", 1); -#endif - bail(NO_SLEEP_EXIT, 1); - } - - pwd = getpwnam(username); - if (pwd != NULL && pwd->pw_uid == 0) - rootlogin = 1; - - /* - * If the -f option was specified and the caller is - * root or the caller isn't changing their uid, don't - * authenticate. - */ - if (pwd != NULL && fflag && - (uid == (uid_t)0 || uid == (uid_t)pwd->pw_uid)) { - /* already authenticated */ - rval = 0; -#ifdef USE_BSM_AUDIT - auditsuccess = 0; /* opened a terminal window only */ -#endif - } else { - fflag = 0; - (void)setpriority(PRIO_PROCESS, 0, -4); - rval = auth_pam(); - (void)setpriority(PRIO_PROCESS, 0, 0); - } - - if (pwd && rval == 0) - break; - - pam_cleanup(); - - /* - * We are not exiting here, but this corresponds to a failed - * login event, so set exitstatus to 1. - */ -#ifdef USE_BSM_AUDIT - au_login_fail("Login incorrect", 1); -#endif - - (void)printf("Login incorrect\n"); - failures++; - - pwd = NULL; - - /* - * Allow up to 'retry' (10) attempts, but start - * backing off after 'backoff' (3) attempts. - */ - if (++cnt > backoff) { - if (cnt >= retries) { - badlogin(username); - bail(SLEEP_EXIT, 1); - } - sleep((u_int)((cnt - backoff) * 5)); - } - } - - /* committed to login -- turn off timeout */ - (void)alarm((u_int)0); - (void)signal(SIGHUP, SIG_DFL); - - endpwent(); - -#ifdef USE_BSM_AUDIT - /* Audit successful login. */ - if (auditsuccess) - au_login_success(); -#endif - - /* - * Establish the login class. - */ - lc = login_getpwclass(pwd); - lc_user = login_getuserclass(pwd); - - if (!(quietlog = login_getcapbool(lc_user, "hushlogin", 0))) - 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 = strdup("/"); - if (pwd->pw_dir == NULL) { - syslog(LOG_NOTICE, "strdup(): %m"); - bail(SLEEP_EXIT, 1); - } - } - (void)seteuid(euid); - (void)setegid(egid); - if (!quietlog) { - quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0; - if (!quietlog) - pam_silent = 0; - } - - shell = login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell); - if (*pwd->pw_shell == '\0') - pwd->pw_shell = strdup(_PATH_BSHELL); - if (pwd->pw_shell == NULL) { - syslog(LOG_NOTICE, "strdup(): %m"); - bail(SLEEP_EXIT, 1); - } - if (*shell == '\0') /* Not overridden */ - shell = pwd->pw_shell; - if ((shell = strdup(shell)) == NULL) { - syslog(LOG_NOTICE, "strdup(): %m"); - bail(SLEEP_EXIT, 1); - } - - /* - * 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. - * - * We don't log in the case of EOPNOTSUPP because dev might be - * on NFS, which doesn't support chflags. - * - * We don't log in the EROFS because that means that /dev is on - * a read only file system and we assume that the permissions there - * are sane. - */ - if (ttyn != tname && chflags(ttyn, 0)) - if (errno != EOPNOTSUPP && errno != EROFS) - syslog(LOG_ERR, "chflags(%s): %m", ttyn); - if (ttyn != tname && chown(ttyn, pwd->pw_uid, - (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid)) - if (errno != EROFS) - syslog(LOG_ERR, "chown(%s): %m", ttyn); - - /* - * Exclude cons/vt/ptys only, assume dialup otherwise - * TODO: Make dialup tty determination a library call - * for consistency (finger etc.) - */ - if (hflag && 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 (hflag) - syslog(LOG_INFO, "login from %s on %s as %s", - 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 (hflag) - syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s", - username, tty, hostname); - else - syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", - username, tty); - } - - /* - * Destroy environment unless user has requested its - * preservation - but preserve TERM in all cases - */ - term = getenv("TERM"); - if (!pflag) - environ = envinit; - if (term != NULL) - setenv("TERM", term, 0); - - /* - * 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"); - bail(NO_SLEEP_EXIT, 1); - } - - pam_err = pam_setcred(pamh, pam_silent|PAM_ESTABLISH_CRED); - if (pam_err != PAM_SUCCESS) { - pam_syslog("pam_setcred()"); - bail(NO_SLEEP_EXIT, 1); - } - pam_cred_established = 1; - - pam_err = pam_open_session(pamh, pam_silent); - if (pam_err != PAM_SUCCESS) { - pam_syslog("pam_open_session()"); - bail(NO_SLEEP_EXIT, 1); - } - pam_session_established = 1; - - /* - * We must fork() before setuid() because we need to call - * pam_close_session() as root. - */ - pid = fork(); - if (pid < 0) { - err(1, "fork"); - } else if (pid != 0) { - /* - * Parent: wait for child to finish, then clean up - * session. - */ - int status; - setproctitle("-%s [pam]", getprogname()); - waitpid(pid, &status, 0); - bail(NO_SLEEP_EXIT, 0); - } - - /* - * NOTICE: We are now in the child process! - */ - - /* - * Add any environment variables the PAM modules may have set. - */ - export_pam_environment(); - - /* - * We're done with PAM now; our parent will deal with the rest. - */ - pam_end(pamh, 0); - pamh = NULL; - - /* - * We don't need to be root anymore, so set the login name and - * the UID. - */ - if (setlogin(username) != 0) { - syslog(LOG_ERR, "setlogin(%s): %m - exiting", username); - bail(NO_SLEEP_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); - /* Overwrite "term" from login.conf(5) for any known TERM */ - if (term == NULL && (tp = stypeof(tty)) != NULL) - (void)setenv("TERM", tp, 1); - else - (void)setenv("TERM", TERM_UNKNOWN, 0); - (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 || motd(cw) == -1) - (void)printf("%s", copyright); - - (void)printf("\n"); - - cw = login_getcapstr(lc, "welcome", NULL, NULL); - if (cw != NULL && access(cw, F_OK) == 0) - motd(cw); - else - motd(_PATH_MOTDFILE); - - if (login_getcapbool(lc_user, "nocheckmail", 0) == 0 && - login_getcapbool(lc, "nocheckmail", 0) == 0) { - char *cx; - - /* $MAIL may have been set by class. */ - cx = getenv("MAIL"); - if (cx == NULL) { - asprintf(&cx, "%s/%s", - _PATH_MAILDIR, pwd->pw_name); - } - if (cx && stat(cx, &st) == 0 && st.st_size != 0) - (void)printf("You have %smail.\n", - (st.st_mtime > st.st_atime) ? "new " : ""); - if (getenv("MAIL") == NULL) - free(cx); - } - } - - login_close(lc_user); - 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] - */ - p = strrchr(pwd->pw_shell, '/'); - if (asprintf(&arg0, "-%s", p ? p + 1 : pwd->pw_shell) >= MAXPATHLEN) { - syslog(LOG_ERR, "user: %s: shell exceeds maximum pathname size", - username); - errx(1, "shell exceeds maximum pathname size"); - } else if (arg0 == NULL) { - err(1, "asprintf()"); - } - - execlp(shell, arg0, (char *)0); - err(1, "%s", shell); - - /* - * That's it, folks! - */ -} - -/* - * 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(void) -{ - const char *tmpl_user; - const void *item; - int rval; - - pam_err = pam_authenticate(pamh, pam_silent); - switch (pam_err) { - - 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. - */ - pam_err = pam_get_item(pamh, PAM_USER, &item); - if (pam_err == PAM_SUCCESS) { - tmpl_user = (const char *)item; - if (strcmp(username, tmpl_user) != 0) - pwd = getpwnam(tmpl_user); - } else { - pam_syslog("pam_get_item(PAM_USER)"); - } - rval = 0; - break; - - case PAM_AUTH_ERR: - case PAM_USER_UNKNOWN: - case PAM_MAXTRIES: - rval = 1; - break; - - default: - pam_syslog("pam_authenticate()"); - rval = -1; - break; - } - - if (rval == 0) { - pam_err = pam_acct_mgmt(pamh, pam_silent); - switch (pam_err) { - case PAM_SUCCESS: - break; - case PAM_NEW_AUTHTOK_REQD: - pam_err = pam_chauthtok(pamh, - pam_silent|PAM_CHANGE_EXPIRED_AUTHTOK); - if (pam_err != PAM_SUCCESS) { - pam_syslog("pam_chauthtok()"); - rval = 1; - } - break; - default: - pam_syslog("pam_acct_mgmt()"); - rval = 1; - break; - } - } - - if (rval != 0) { - pam_end(pamh, pam_err); - pamh = NULL; - } - return (rval); -} - -/* - * Export any environment variables PAM modules may have set - */ -static void -export_pam_environment() -{ - char **pam_env; - char **pp; - - pam_env = pam_getenvlist(pamh); - if (pam_env != NULL) { - for (pp = pam_env; *pp != NULL; pp++) { - (void)export(*pp); - free(*pp); - } - } -} - -/* - * Perform sanity checks on an environment variable: - * - 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. - * Then export it. - */ -static int -export(const char *s) -{ - static const char *noexport[] = { - "SHELL", "HOME", "LOGNAME", "MAIL", "CDPATH", - "IFS", "PATH", NULL - }; - char *p; - const char **pp; - size_t n; - - if (strlen(s) > 1024 || (p = 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); - } - *p = '\0'; - (void)setenv(s, p + 1, 1); - *p = '='; - return (1); -} - -static void -usage() -{ - - (void)fprintf(stderr, "usage: login [-fp] [-h hostname] [username]\n"); - exit(1); -} - -/* - * Prompt user and read login name from stdin. - */ -static char * -getloginname() -{ - char *nbuf, *p; - int ch; - - nbuf = malloc(MAXLOGNAME); - if (nbuf == NULL) - err(1, "malloc()"); - do { - (void)printf("%s", prompt); - for (p = nbuf; (ch = getchar()) != '\n'; ) { - if (ch == EOF) { - badlogin(username); - bail(NO_SLEEP_EXIT, 0); - } - if (p < nbuf + MAXLOGNAME - 1) - *p++ = ch; - } - } while (p == nbuf); - - *p = '\0'; - if (nbuf[0] == '-') { - pam_silent = 0; - memmove(nbuf, nbuf + 1, strlen(nbuf)); - } else { - pam_silent = PAM_SILENT; - } - return nbuf; -} - -/* - * SIGINT handler for motd(). - */ -static volatile int motdinterrupt; -static void -sigint(int signo __unused) -{ - motdinterrupt = 1; -} - -/* - * Display the contents of a file (such as /etc/motd). - */ -static int -motd(const char *motdfile) -{ - sig_t oldint; - FILE *f; - int ch; - - if ((f = fopen(motdfile, "r")) == NULL) - return (-1); - motdinterrupt = 0; - oldint = signal(SIGINT, sigint); - while ((ch = fgetc(f)) != EOF && !motdinterrupt) - putchar(ch); - signal(SIGINT, oldint); - if (ch != EOF || ferror(f)) { - fclose(f); - return (-1); - } - fclose(f); - return (0); -} - -/* - * SIGALRM handler, to enforce login prompt timeout. - * - * XXX This can potentially confuse the hell out of PAM. We should - * XXX instead implement a conversation function that returns - * XXX PAM_CONV_ERR when interrupted by a signal, and have the signal - * XXX handler just set a flag. - */ -static void -timedout(int signo __unused) -{ - - longjmp(timeout_buf, signo); -} - -static void -badlogin(char *name) -{ - - if (failures == 0) - return; - if (hflag) { - syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s", - failures, failures > 1 ? "S" : "", hostname); - syslog(LOG_AUTHPRIV|LOG_NOTICE, - "%d LOGIN FAILURE%s FROM %s, %s", - failures, failures > 1 ? "S" : "", 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; -} - -const char * -stypeof(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 (NULL); -} - -static void -refused(const char *msg, const char *rtype, int lout) -{ - - if (msg != NULL) - printf("%s.\n", msg); - if (hflag) - syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) FROM %s ON TTY %s", - pwd->pw_name, rtype, hostname, tty); - else - syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) ON TTY %s", - pwd->pw_name, rtype, tty); - if (lout) - bail(SLEEP_EXIT, 1); -} - -/* - * Log a PAM error - */ -static void -pam_syslog(const char *msg) -{ - syslog(LOG_ERR, "%s: %s", msg, pam_strerror(pamh, pam_err)); -} - -/* - * Shut down PAM - */ -static void -pam_cleanup() -{ - - if (pamh != NULL) { - if (pam_session_established) { - pam_err = pam_close_session(pamh, 0); - if (pam_err != PAM_SUCCESS) - pam_syslog("pam_close_session()"); - } - pam_session_established = 0; - if (pam_cred_established) { - pam_err = pam_setcred(pamh, pam_silent|PAM_DELETE_CRED); - if (pam_err != PAM_SUCCESS) - pam_syslog("pam_setcred()"); - } - pam_cred_established = 0; - pam_end(pamh, pam_err); - pamh = NULL; - } -} - -/* - * Exit, optionally after sleeping a few seconds - */ -void -bail(int sec, int eval) -{ - - pam_cleanup(); -#ifdef USE_BSM_AUDIT - if (pwd != NULL) - audit_logout(); -#endif - (void)sleep(sec); - exit(eval); -} |
