freebsd-dev/usr.bin/login/login.c

998 lines
24 KiB
C

/*-
* 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
static char sccsid[] = "@(#)login.c 8.4 (Berkeley) 4/2/94";
#endif /* not lint */
/*
* 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/stat.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/file.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <err.h>
#include <errno.h>
#include <grp.h>
#include <netdb.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 <utmp.h>
#ifdef LOGIN_CAP
#include <login_cap.h>
#else /* Undef AUTH as well */
#undef LOGIN_CAP_AUTH
#endif
/*
* If LOGIN_CAP_AUTH is activated:
* kerberose & skey logins are runtime selected via login
* login_getstyle() and authentication types for login classes
* The actual login itself is handled via /usr/libexec/login_<style>
* Valid styles are determined by the auth-type=style,style entries
* in the login class.
*/
#ifdef LOGIN_CAP_AUTH
#undef KERBEROS
#undef SKEY
#endif /* LOGIN_CAP_AUTH */
#ifdef SKEY
#include <skey.h>
#endif /* SKEY */
#include "pathnames.h"
void badlogin __P((char *));
void checknologin __P((void));
void dolastlog __P((int));
void getloginname __P((void));
void motd __P((char *));
int rootterm __P((char *));
void sigint __P((int));
void sleepexit __P((int));
void refused __P((char *,char *,int));
char *stypeof __P((char *));
void timedout __P((int));
void login_fbtab __P((char *, uid_t, gid_t));
#ifdef KERBEROS
int klogin __P((struct passwd *, char *, char *, char *));
#endif
extern void login __P((struct utmp *));
#define TTYGRPNAME "tty" /* name of group to own ttys */
#define DEFAULT_BACKOFF 3
#define DEFAULT_RETRIES 10
/*
* 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;
#ifdef KERBEROS
int notickets = 1;
int noticketsdontcomplain = 1;
char *instance;
char *krbtkfile_env;
int authok;
#endif
struct passwd *pwd;
int failures;
char *term, *envinit[1], *hostname, *username, *tty;
char full_hostname[MAXHOSTNAMELEN];
int
main(argc, argv)
int argc;
char *argv[];
{
extern char **environ;
struct group *gr;
struct stat st;
struct timeval tp;
struct utmp utmp;
int rootok, retries, backoff;
int ask, ch, cnt, fflag, hflag, pflag, quietlog, rootlogin, rval;
int changepass;
time_t warntime;
uid_t uid;
char *domain, *p, *ep, *salt, *ttyn;
char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10];
char localhost[MAXHOSTNAMELEN];
char *shell = NULL;
#ifdef LOGIN_CAP
login_cap_t *lc = NULL;
#ifdef LOGIN_CAP_AUTH
char *style, *authtype;
char *auth_method = NULL;
char *instance = NULL;
int authok;
#endif /* LOGIN_CAP_AUTH */
#endif /* LOGIN_CAP */
#ifdef SKEY
int permit_passwd = 0;
#endif /* SKEY */
(void)signal(SIGALRM, timedout);
(void)alarm(timeout);
(void)signal(SIGQUIT, SIG_IGN);
(void)signal(SIGINT, SIG_IGN);
(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';
domain = NULL;
term = NULL;
if (gethostname(localhost, sizeof(localhost)) < 0)
syslog(LOG_ERR, "couldn't get local hostname: %m");
else
domain = strchr(localhost, '.');
fflag = hflag = pflag = 0;
uid = getuid();
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;
strncpy(full_hostname, optarg, sizeof(full_hostname)-1);
if (domain && (p = strchr(optarg, '.')) &&
strcasecmp(p, domain) == 0)
*p = 0;
if (strlen(optarg) > UT_HOSTSIZE) {
struct hostent *hp = gethostbyname(optarg);
if (hp != NULL) {
struct in_addr in;
memmove(&in, hp->h_addr, sizeof(in));
optarg = strdup(inet_ntoa(in));
} else
optarg = "invalid hostname";
}
hostname = optarg;
break;
case 'p':
pflag = 1;
break;
case '?':
default:
if (!uid)
syslog(LOG_ERR, "invalid flag %c", ch);
(void)fprintf(stderr,
"usage: login [-fp] [-h hostname] [username]\n");
exit(1);
}
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;
#ifdef LOGIN_CAP_AUTH
authtype = hostname ? "rlogin" : "login";
#endif
#ifdef LOGIN_CAP
/*
* Get "login-retries" & "login-backoff" from default class
*/
lc = login_getclass(NULL);
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;
#else
retries = DEFAULT_RETRIES;
backoff = DEFAULT_BACKOFF;
#endif
for (cnt = 0;; ask = 1) {
if (ask) {
fflag = 0;
getloginname();
}
rootlogin = 0;
rootok = rootterm(tty); /* Default (auth may change) */
#ifdef LOGIN_CAP_AUTH
authok = 0;
if (auth_method = strchr(username, ':')) {
*auth_method = '\0';
auth_method++;
if (*auth_method == '\0')
auth_method = NULL;
}
/*
* We need to do this regardless of whether
* kerberos is available.
*/
if ((instance = strchr(username, '.')) != NULL) {
if (strncmp(instance, ".root", 5) == 0)
rootlogin = 1;
*instance++ = '\0';
} else
instance = "";
#else /* !LOGIN_CAP_AUTH */
#ifdef KERBEROS
if ((instance = strchr(username, '.')) != NULL) {
if (strncmp(instance, ".root", 5) == 0)
rootlogin = 1;
*instance++ = '\0';
} else
instance = "";
#endif /* KERBEROS */
#endif /* LOGIN_CAP_AUTH */
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)strcpy(tbuf, username);
if ((pwd = getpwnam(username)) != NULL)
salt = pwd->pw_passwd;
else
salt = "xx";
#ifdef LOGIN_CAP
/*
* Establish the class now, before we might goto
* within the next block. pwd can be NULL since it
* falls back to the "default" class if it is.
*/
lc = login_getpwclass(pwd);
#endif /* LOGIN_CAP */
/*
* 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.
*/
rval = 1;
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 LOGIN_CAP_AUTH
/*
* This hands off authorization to an authorization program,
* depending on the styles available for the "auth-login",
* auth-rlogin (or default) authorization styles.
* We do this regardless of whether an account exists so that
* the remote user cannot tell a "real" from an invented
* account name. If we don't have an account we just fall
* back to the first method for the "default" class.
*/
if (!(style = login_getstyle(lc, auth_method, authtype))) {
/*
* No available authorization method
*/
rval = 1;
(void)printf("No auth method available for %s.\n",
authtype);
} else {
/*
* Put back the kerberos instance, if any was given.
* Don't worry about the non-kerberos case here, since
* if kerberos is not available or not selected and an
* instance is given at the login prompt, su or rlogin -l,
* then anything else should fail as well.
*/
if (*instance)
*(instance - 1) = '.';
rval = authenticate(username,
lc ? lc->lc_class : "default",
style, authtype);
/* Junk it again */
if (*instance)
*(instance - 1) = '\0';
}
if (!rval) {
char * approvp;
/*
* If authentication succeeds, run any approval
* program, if applicable for this class.
*/
approvep = login_getcapstr(lc, "approve", NULL, NULL);
rval = 1; /* Assume bad login again */
if (approvep==NULL ||
auth_script(approvep, approvep, username,
lc->lc_class, 0) == 0) {
int r;
r = auth_scan(AUTH_OKAY);
/*
* See what the authorize program says
*/
if (r != AUTH_NONE) {
rval = 0;
if (!rootok && (r & AUTH_ROOTOKAY))
rootok = 1; /* root approved */
else
rootlogin = 0;
if (!authok && (r & AUTH_SECURE))
authok = 1; /* secure */
}
}
}
#else /* !LOGIN_CAP_AUTH */
#ifdef SKEY
permit_passwd = skeyaccess(username, tty,
hostname ? full_hostname : NULL,
NULL);
p = skey_getpass("Password:", pwd, permit_passwd);
ep = skey_crypt(p, salt, pwd, permit_passwd);
#else /* !SKEY */
p = getpass("Password:");
ep = crypt(p, salt);
#endif/* SKEY */
if (pwd) {
#ifdef KERBEROS
#ifdef SKEY
/*
* Do not allow user to type in kerberos password
* over the net (actually, this is ok for encrypted
* links, but we have no way of determining if the
* link is encrypted.
*/
if (!permit_passwd) {
rval = 1; /* failed */
} else
#endif /* SKEY */
rval = klogin(pwd, instance, localhost, p);
if (rval != 0 && rootlogin && pwd->pw_uid != 0)
rootlogin = 0;
if (rval == 0)
authok = 1; /* kerberos authenticated ok */
else if (rval == 1) /* fallback to unix passwd */
rval = strcmp(ep, pwd->pw_passwd);
#else /* !KERBEROS */
rval = strcmp(ep, pwd->pw_passwd);
#endif /* KERBEROS */
}
/* clear entered password */
memset(p, 0, strlen(p));
#endif /* LOGIN_CAP_AUTH */
(void)setpriority(PRIO_PROCESS, 0, 0);
#ifdef LOGIN_CAP_AUTH
if (rval)
auth_rmfiles();
#endif
ttycheck:
/*
* If trying to log in as root without Kerberos,
* but with insecure terminal, refuse the login attempt.
*/
if (pwd && !rval) {
#if defined(KERBEROS) || defined(LOGIN_CAP_AUTH)
if (authok == 0 && rootlogin && !rootok)
#else
if (rootlogin && !rootok)
#endif
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 - 3) * 5));
}
}
/* committed to login -- turn off timeout */
(void)alarm((u_int)0);
endpwent();
/* if user not super-user, check for disabled logins */
#ifdef LOGIN_CAP
if (!rootlogin)
auth_checknologin(lc);
#else
if (!rootlogin)
checknologin();
#endif
#ifdef LOGIN_CAP
quietlog = login_getcapbool(lc, "hushlogin", 0);
#else
quietlog = 0;
#endif
if (!*pwd->pw_dir || chdir(pwd->pw_dir) < 0) {
#ifdef LOGIN_CAP
if (login_getcapbool(lc, "requirehome", 0))
refused("Home directory not available", "HOMEDIR", 1);
#endif
if (chdir("/") < 0)
refused("Cannot find root directory", "ROOTDIR", 1);
pwd->pw_dir = "/";
if (!quietlog || *pwd->pw_dir)
printf("No home directory.\nLogging in with home = \"/\".\n");
}
if (!quietlog)
quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0;
if (pwd->pw_change || pwd->pw_expire)
(void)gettimeofday(&tp, (struct timezone *)NULL);
#define DEFAULT_WARN (2L * 7L & 86400L) /* Two weeks */
#ifdef LOGIN_CAP
warntime = login_getcaptime(lc, "warnpassword",
DEFAULT_WARN, DEFAULT_WARN);
#else
warntime = DEFAULT_WARN;
#endif
changepass=0;
if (pwd->pw_change) {
if (tp.tv_sec >= 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 - tp.tv_sec < warntime && !quietlog)
(void)printf("Warning: your password expires on %s",
ctime(&pwd->pw_change));
}
#ifdef LOGIN_CAP
warntime = login_getcaptime(lc, "warnexpire",
DEFAULT_WARN, DEFAULT_WARN);
#else
warntime = DEFAULT_WARN;
#endif
if (pwd->pw_expire) {
if (tp.tv_sec >= pwd->pw_expire) {
refused("Sorry -- your account has expired",
"EXPIRED", 1);
} else if (pwd->pw_expire - tp.tv_sec < warntime && !quietlog)
(void)printf("Warning: your account expires on %s",
ctime(&pwd->pw_expire));
}
#ifdef LOGIN_CAP
if (lc != NULL) {
if (hostname) {
struct hostent *hp = gethostbyname(full_hostname);
if (hp == NULL)
optarg = NULL;
else {
struct in_addr in;
memmove(&in, hp->h_addr, sizeof(in));
optarg = strdup(inet_ntoa(in));
}
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);
#else /* !LOGIN_CAP */
shell=pwd->pw_shell;
#endif /* LOGIN_CAP */
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, "memory allocation error");
sleepexit(1);
}
#ifdef LOGIN_ACCESS
if (login_access(pwd->pw_name, hostname ? full_hostname : tty) == 0)
refused("Permission denied", "ACCESS", 1);
#endif /* LOGIN_ACCESS */
/* Nothing else left to fail -- really log in. */
memset((void *)&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);
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);
(void)chown(ttyn, pwd->pw_uid,
(gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid);
/*
* Preserve TERM if it happens to be already set.
*/
if ((term = getenv("TERM")) != NULL)
term = strdup(term);
/*
* 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 KERBEROS
if (!quietlog && notickets == 1 && !noticketsdontcomplain)
(void)printf("Warning: no Kerberos tickets issued.\n");
#endif
#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;
/*
* We don't need to be root anymore, so
* set the user and session context
*/
#ifdef LOGIN_CAP
if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETALL) != 0) {
syslog(LOG_ERR, "setusercontext() failed - exiting");
exit(1);
}
#else
if (setlogin(pwd->pw_name) < 0)
syslog(LOG_ERR, "setlogin() failure: %m");
(void)setgid(pwd->pw_gid);
initgroups(username, pwd->pw_gid);
(void)setuid(rootlogin ? 0 : pwd->pw_uid);
#endif
(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", pwd->pw_name, 1);
(void)setenv("USER", pwd->pw_name, 1);
(void)setenv("PATH", rootlogin ? _PATH_STDPATH : _PATH_DEFPATH, 0);
#ifdef KERBEROS
if (krbtkfile_env)
(void)setenv("KRBTKFILE", krbtkfile_env, 1);
#endif
#if LOGIN_CAP_AUTH
auth_env();
#endif
#ifdef LOGIN_CAP
if (!quietlog) {
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) {
strncpy(tbuf, cw, sizeof(tbuf));
tbuf[sizeof(tbuf)-1] = '\0';
} else
snprintf(tbuf, sizeof(tbuf), "%s/%s",
_PATH_MAILDIR, pwd->pw_name);
#else
if (!quietlog) {
(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.");
motd(_PATH_MOTDFILE);
snprintf(tbuf, sizeof(tbuf), "%s/%s",
_PATH_MAILDIR, pwd->pw_name);
#endif
if (stat(tbuf, &st) == 0 && st.st_size != 0)
(void)printf("You have %smail.\n",
(st.st_mtime > st.st_atime) ? "new " : "");
}
#ifdef LOGIN_CAP
login_close(lc);
#endif
(void)signal(SIGALRM, SIG_DFL);
(void)signal(SIGQUIT, SIG_DFL);
(void)signal(SIGINT, SIG_DFL);
(void)signal(SIGTSTP, SIG_IGN);
if (changepass) {
if (system(_PATH_CHPASS) != 0)
sleepexit(1);
}
/*
* Login shells have a leading '-' in front of argv[0]
*/
tbuf[0] = '-';
(void)strcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ? p + 1 : pwd->pw_shell);
execlp(shell, tbuf, 0);
err(1, "%s", shell);
}
/*
* Allow for authentication style and/or kerberos instance
* */
#define NBUFSIZ UT_NAMESIZE + 64
void
getloginname()
{
int ch;
char *p;
static char nbuf[NBUFSIZ];
for (;;) {
(void)printf("login: ");
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;
/* ARGSUSED */
void
sigint(signo)
int signo;
{
motdinterrupt = 1;
}
void
motd(motdfile)
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;
{
(void)fprintf(stderr, "Login timed out after %d seconds\n", timeout);
exit(0);
}
#ifndef LOGIN_CAP
void
checknologin()
{
int fd, nchars;
char tbuf[8192];
if ((fd = open(_PATH_NOLOGIN, O_RDONLY, 0)) >= 0) {
while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
(void)write(fileno(stdout), tbuf, nchars);
sleepexit(0);
}
}
#endif
void
dolastlog(quiet)
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), 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);
}
}
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);
}
}
#undef UNKNOWN
#define UNKNOWN "su"
char *
stypeof(ttyid)
char *ttyid;
{
struct ttyent *t;
return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : 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);
}