X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/f01752c580c2560960798fccb82fe0b9e0d90253..133ce0bc0996f2a55c50c673895d981e9c77691b:/usr/src/usr.bin/login/login.c

diff --git a/usr/src/usr.bin/login/login.c b/usr/src/usr.bin/login/login.c
index b6164b4e71..d83752a117 100644
--- a/usr/src/usr.bin/login/login.c
+++ b/usr/src/usr.bin/login/login.c
@@ -1,11 +1,24 @@
+/*
+ * Copyright (c) 1980,1987 Regents of the University of California.
+ * All rights reserved.  The Berkeley software License Agreement
+ * specifies the terms and conditions for redistribution.
+ */
+
 #ifndef lint
-static	char *sccsid = "@(#)login.c	4.35 (Berkeley) 84/12/17";
-#endif
+char copyright[] =
+"@(#) Copyright (c) 1980 Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif not lint
+
+#ifndef lint
+static char sccsid[] = "@(#)login.c	5.23 (Berkeley) %G%";
+#endif not lint
 
 /*
  * login [ name ]
- * login -r hostname (for rlogind)
- * login -h hostname (for telnetd, etc.)
+ * login -r hostname	(for rlogind)
+ * login -h hostname	(for telnetd, etc.)
+ * login -f name	(for pre-authenticated login: datakit, xterm, etc.)
  */
 
 #include <sys/param.h>
@@ -24,11 +37,16 @@ static	char *sccsid = "@(#)login.c	4.35 (Berkeley) 84/12/17";
 #include <errno.h>
 #include <ttyent.h>
 #include <syslog.h>
+#include <grp.h>
+
+#define TTYGRPNAME	"tty"		/* name of group to own ttys */
+#define TTYGID(gid)	tty_gid(gid)	/* gid that owns all ttys */
 
 #define	SCMPN(a, b)	strncmp(a, b, sizeof(a))
 #define	SCPYN(a, b)	strncpy(a, b, sizeof(a))
 
 #define NMAX	sizeof(utmp.ut_name)
+#define HMAX	sizeof(utmp.ut_host)
 
 #define	FALSE	0
 #define	TRUE	-1
@@ -41,19 +59,14 @@ struct	passwd nouser = {"", "nope", -1, -1, -1, "", "", "", "" };
 struct	sgttyb ttyb;
 struct	utmp utmp;
 char	minusnam[16] = "-";
+char	*envinit[1];			/* now set by setenv calls */
 /*
  * This bounds the time given to login.  We initialize it here
  * so it can be patched on machines where it's too small.
  */
-int	timeout = 60;
+int	timeout = 300;
 
-char	homedir[64] = "HOME=";
-char	shell[64] = "SHELL=";
-char	term[64] = "TERM=";
-char	user[20] = "USER=";
-
-char	*envinit[] =
-    { homedir, shell, "PATH=:/usr/ucb:/bin:/usr/bin", term, user, 0 };
+char	term[64];
 
 struct	passwd *pwd;
 char	*strcat(), *rindex(), *index();
@@ -62,7 +75,6 @@ char	*ttyname();
 char	*crypt();
 char	*getpass();
 char	*stypeof();
-extern	char **environ;
 extern	int errno;
 
 struct	tchars tc = {
@@ -72,21 +84,27 @@ struct	ltchars ltc = {
 	CSUSP, CDSUSP, CRPRNT, CFLUSH, CWERASE, CLNEXT
 };
 
+struct winsize win = { 0, 0, 0, 0 };
+
 int	rflag;
+int	usererr = -1;
 char	rusername[NMAX+1], lusername[NMAX+1];
 char	rpassword[NMAX+1];
 char	name[NMAX+1];
+char	me[MAXHOSTNAMELEN];
 char	*rhost;
 
 main(argc, argv)
 	char *argv[];
 {
+	extern	char **environ;
 	register char *namep;
-	int t, f, c;
+	int pflag = 0, hflag = 0, fflag = 0, t, f, c;
 	int invalid, quietlog;
 	FILE *nlfd;
 	char *ttyn, *tty;
 	int ldisc = 0, zero = 0;
+	char *p, *domain, *index();
 
 	signal(SIGALRM, timedout);
 	alarm(timeout);
@@ -95,20 +113,65 @@ main(argc, argv)
 	setpriority(PRIO_PROCESS, 0, 0);
 	quota(Q_SETUID, 0, 0, 0);
 	/*
+	 * -p is used by getty to tell login not to destroy the environment
 	 * -r is used by rlogind to cause the autologin protocol;
+ 	 * -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
 	 */
-	if (argc > 1) {
+	(void) gethostname(me, sizeof(me));
+	domain = index(me, '.');
+	while (argc > 1) {
 		if (strcmp(argv[1], "-r") == 0) {
-			rflag = doremotelogin(argv[2]);
+			if (rflag || hflag || fflag) {
+				printf("Other options not allowed with -r\n");
+				exit(1);
+			}
+			if (argv[2] == 0)
+				exit(1);
+			rflag = 1;
+			usererr = doremotelogin(argv[2]);
+			if ((p = index(argv[2], '.')) && strcmp(p, domain) == 0)
+				*p = 0;
 			SCPYN(utmp.ut_host, argv[2]);
-			argc = 0;
+			argc -= 2;
+			argv += 2;
+			continue;
 		}
-		if (strcmp(argv[1], "-h") == 0 && getuid() == 0) {
-			SCPYN(utmp.ut_host, argv[2]);
-			argc = 0;
+		if (strcmp(argv[1], "-h") == 0) {
+			if (getuid() == 0) {
+				if (rflag || hflag) {
+				    printf("Only one of -r and -h allowed\n");
+				    exit(1);
+				}
+				hflag = 1;
+				if ((p = index(argv[2], '.')) &&
+				    strcmp(p, domain) == 0)
+					*p = 0;
+				SCPYN(utmp.ut_host, argv[2]);
+			}
+			argc -= 2;
+			argv += 2;
+			continue;
+		}
+		if (strcmp(argv[1], "-f") == 0 && argc > 2) {
+			if (rflag) {
+				printf("Only one of -r and -f allowed\n");
+				exit(1);
+			}
+			fflag = 1;
+			SCPYN(utmp.ut_name, argv[2]);
+			argc -= 2;
+			argv += 2;
+			continue;
 		}
+		if (strcmp(argv[1], "-p") == 0) {
+			argc--;
+			argv++;
+			pflag = 1;
+			continue;
+		}
+		break;
 	}
 	ioctl(0, TIOCLSET, &zero);
 	ioctl(0, TIOCNXCL, 0);
@@ -122,26 +185,29 @@ main(argc, argv)
 	 */
 	if (rflag)
 		doremoteterm(term, &ttyb);
+	ttyb.sg_erase = CERASE;
+	ttyb.sg_kill = CKILL;
 	ioctl(0, TIOCSLTC, &ltc);
 	ioctl(0, TIOCSETC, &tc);
 	ioctl(0, TIOCSETP, &ttyb);
-	for (t = getdtablesize(); t > 3; t--)
+	for (t = getdtablesize(); t > 2; t--)
 		close(t);
 	ttyn = ttyname(0);
-	if (ttyn == (char *)0)
+	if (ttyn == (char *)0 || *ttyn == '\0')
 		ttyn = "/dev/tty??";
 	tty = rindex(ttyn, '/');
 	if (tty == NULL)
 		tty = ttyn;
 	else
 		tty++;
-	openlog("login", 0, 0);
+	openlog("login", LOG_ODELAY, LOG_AUTH);
 	t = 0;
+	invalid = FALSE;
 	do {
 		ldisc = 0;
 		ioctl(0, TIOCSETD, &ldisc);
-		invalid = FALSE;
-		SCPYN(utmp.ut_name, "");
+		if (fflag == 0)
+			SCPYN(utmp.ut_name, "");
 		/*
 		 * Name specified, take it.
 		 */
@@ -153,23 +219,38 @@ main(argc, argv)
 		 * If remote login take given name,
 		 * otherwise prompt user for something.
 		 */
-		if (rflag) {
+		if (rflag && !invalid)
 			SCPYN(utmp.ut_name, lusername);
-			/* autologin failed, prompt for passwd */
-			if (rflag == -1)
-				rflag = 0;
-		} else
+		else {
 			getloginname(&utmp);
+			if (utmp.ut_name[0] == '-') {
+				puts("login names may not start with '-'.");
+				invalid = TRUE;
+				continue;
+			}
+		}
+		invalid = FALSE;
 		if (!strcmp(pwd->pw_shell, "/bin/csh")) {
 			ldisc = NTTYDISC;
 			ioctl(0, TIOCSETD, &ldisc);
 		}
+		if (fflag) {
+			int uid = getuid();
+
+			if (uid != 0 && uid != pwd->pw_uid)
+				fflag = 0;
+			/*
+			 * Disallow automatic login for root.
+			 */
+			if (pwd->pw_uid == 0)
+				fflag = 0;
+		}
 		/*
 		 * If no remote login authentication and
 		 * a password exists for this user, prompt
 		 * for one and verify it.
 		 */
-		if (!rflag && *pwd->pw_passwd != '\0') {
+		if (usererr == -1 && fflag == 0 && *pwd->pw_passwd != '\0') {
 			char *pp;
 
 			setpriority(PRIO_PROCESS, 0, -4);
@@ -182,7 +263,7 @@ main(argc, argv)
 		/*
 		 * If user not super-user, check for logins disabled.
 		 */
-		if (pwd->pw_uid != 0 && (nlfd = fopen(nolog, "r")) > 0) {
+		if (pwd->pw_uid != 0 && (nlfd = fopen(nolog, "r"))) {
 			while ((c = getc(nlfd)) != EOF)
 				putchar(c);
 			fflush(stdout);
@@ -194,19 +275,29 @@ main(argc, argv)
 		 * see if root logins on this terminal are permitted.
 		 */
 		if (!invalid && pwd->pw_uid == 0 && !rootterm(tty)) {
-			syslog(LOG_INFO, "ROOT LOGIN REFUSED %s", tty);
+			if (utmp.ut_host[0])
+				syslog(LOG_CRIT,
+				    "ROOT LOGIN REFUSED ON %s FROM %.*s",
+				    tty, HMAX, utmp.ut_host);
+			else
+				syslog(LOG_CRIT,
+				    "ROOT LOGIN REFUSED ON %s", tty);
 			invalid = TRUE;
 		}
 		if (invalid) {
 			printf("Login incorrect\n");
 			if (++t >= 5) {
-				syslog(LOG_INFO,
-				    "REPEATED LOGIN FAILURES %s, %s",
-					tty, utmp.ut_name);
+				if (utmp.ut_host[0])
+					syslog(LOG_ERR,
+			    "REPEATED LOGIN FAILURES ON %s FROM %.*s, %.*s",
+					    tty, HMAX, utmp.ut_host,
+					    NMAX, utmp.ut_name);
+				else
+					syslog(LOG_ERR,
+				    "REPEATED LOGIN FAILURES ON %s, %.*s",
+						tty, NMAX, utmp.ut_name);
 				ioctl(0, TIOCHPCL, (struct sgttyb *) 0);
-				close(0);
-				close(1);
-				close(2);
+				close(0), close(1), close(2);
 				sleep(10);
 				exit(1);
 			}
@@ -227,13 +318,13 @@ main(argc, argv)
 		 * Remote login invalid must have been because
 		 * of a restriction of some sort, no extra chances.
 		 */
-		if (rflag && invalid)
+		if (!usererr && invalid)
 			exit(1);
 	} while (invalid);
 /* committed to login turn off timeout */
 	alarm(0);
 
-	if (quota(Q_SETUID, pwd->pw_uid, 0, 0) < 0) {
+	if (quota(Q_SETUID, pwd->pw_uid, 0, 0) < 0 && errno != EINVAL) {
 		if (errno == EUSERS)
 			printf("%s.\n%s.\n",
 			   "Too many users logged on already",
@@ -241,22 +332,13 @@ main(argc, argv)
 		else if (errno == EPROCLIM)
 			printf("You have too many processes running.\n");
 		else
-			perror("setuid");
+			perror("quota (Q_SETUID)");
 		sleep(5);
 		exit(0);
 	}
 	time(&utmp.ut_time);
-	t = ttyslot();
-	if (t > 0 && (f = open("/etc/utmp", O_WRONLY)) >= 0) {
-		lseek(f, (long)(t*sizeof(utmp)), 0);
-		SCPYN(utmp.ut_line, tty);
-		write(f, (char *)&utmp, sizeof(utmp));
-		close(f);
-	}
-	if ((f = open("/usr/adm/wtmp", O_WRONLY|O_APPEND)) >= 0) {
-		write(f, (char *)&utmp, sizeof(utmp));
-		close(f);
-	}
+	SCPYN(utmp.ut_line, tty);
+	login(&utmp);
 	quietlog = access(qlog, F_OK) == 0;
 	if ((f = open(lastlog, O_RDWR)) >= 0) {
 		struct lastlog ll;
@@ -280,36 +362,49 @@ main(argc, argv)
 		write(f, (char *) &ll, sizeof ll);
 		close(f);
 	}
-	chown(ttyn, pwd->pw_uid, pwd->pw_gid);
-	chmod(ttyn, 0622);
+	chown(ttyn, pwd->pw_uid, TTYGID(pwd->pw_gid));
+	if (!hflag && !rflag)					/* XXX */
+		ioctl(0, TIOCSWINSZ, &win);
+	chmod(ttyn, 0620);
 	setgid(pwd->pw_gid);
 	strncpy(name, utmp.ut_name, NMAX);
 	name[NMAX] = '\0';
 	initgroups(name, pwd->pw_gid);
 	quota(Q_DOWARN, pwd->pw_uid, (dev_t)-1, 0);
 	setuid(pwd->pw_uid);
-	environ = envinit;
-	strncat(homedir, pwd->pw_dir, sizeof(homedir)-6);
-	strncat(shell, pwd->pw_shell, sizeof(shell)-7);
-	if (term[strlen("TERM=")] == 0)
-		strncat(term, stypeof(tty), sizeof(term)-6);
-	strncat(user, pwd->pw_name, sizeof(user)-6);
+
+	/* destroy environment unless user has asked to preserve it */
+	if (!pflag)
+		environ = envinit;
+	setenv("HOME", pwd->pw_dir, 1);
+	setenv("SHELL", pwd->pw_shell, 1);
+	if (term[0] == '\0')
+		strncpy(term, stypeof(tty), sizeof(term));
+	setenv("TERM", term, 0);
+	setenv("USER", pwd->pw_name, 1);
+	setenv("PATH", ":/usr/ucb:/bin:/usr/bin", 0);
+
 	if ((namep = rindex(pwd->pw_shell, '/')) == NULL)
 		namep = pwd->pw_shell;
 	else
 		namep++;
 	strcat(minusnam, namep);
 	if (tty[sizeof("tty")-1] == 'd')
-		syslog(LOG_INFO, "DIALUP %s %s", tty, pwd->pw_name);
+		syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name);
+	if (pwd->pw_uid == 0)
+		if (utmp.ut_host[0])
+			syslog(LOG_NOTICE, "ROOT LOGIN %s FROM %.*s",
+			    tty, HMAX, utmp.ut_host);
+		else
+			syslog(LOG_NOTICE, "ROOT LOGIN %s", tty);
 	if (!quietlog) {
+		struct stat st;
+
 		showmotd();
 		strcat(maildir, pwd->pw_name);
-		if (access(maildir, R_OK) == 0) {
-			struct stat statb;
-			stat(maildir, &statb);
-			if (statb.st_size)
-				printf("You have mail.\n");
-		}
+		if (stat(maildir, &st) == 0 && st.st_size != 0)
+			printf("You have %smail.\n",
+				(st.st_mtime > st.st_atime) ? "new " : "");
 	}
 	signal(SIGALRM, SIG_DFL);
 	signal(SIGQUIT, SIG_DFL);
@@ -403,65 +498,19 @@ stypeof(ttyid)
 doremotelogin(host)
 	char *host;
 {
-	FILE *hostf;
-	int first = 1;
-
 	getstr(rusername, sizeof (rusername), "remuser");
 	getstr(lusername, sizeof (lusername), "locuser");
-	getstr(term+5, sizeof(term)-5, "Terminal type");
+	getstr(term, sizeof(term), "Terminal type");
 	if (getuid()) {
 		pwd = &nouser;
-		goto bad;
+		return(-1);
 	}
 	pwd = getpwnam(lusername);
 	if (pwd == NULL) {
 		pwd = &nouser;
-		goto bad;
+		return(-1);
 	}
-	hostf = pwd->pw_uid ? fopen("/etc/hosts.equiv", "r") : 0;
-again:
-	if (hostf) {
-		char ahost[32];
-
-		while (fgets(ahost, sizeof (ahost), hostf)) {
-			char *user;
-
-			if ((user = index(ahost, '\n')) != 0)
-				*user++ = '\0';
-			if ((user = index(ahost, ' ')) != 0)
-				*user++ = '\0';
-			if (!strcmp(host, ahost) &&
-			    !strcmp(rusername, user ? user : lusername)) {
-				fclose(hostf);
-				return (1);
-			}
-		}
-		fclose(hostf);
-	}
-	if (first == 1) {
-		char *rhosts = ".rhosts";
-		struct stat sbuf;
-
-		first = 0;
-		if (chdir(pwd->pw_dir) < 0)
-			goto again;
-		if (lstat(rhosts, &sbuf) < 0)
-			goto again;
-		if ((sbuf.st_mode & S_IFMT) == S_IFLNK) {
-			printf("login: .rhosts is a soft link.\r\n");
-			goto bad;
-		}
-		hostf = fopen(rhosts, "r");
-		fstat(fileno(hostf), &sbuf);
-		if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid) {
-			printf("login: Bad .rhosts ownership.\r\n");
-			fclose(hostf);
-			goto bad;
-		}
-		goto again;
-	}
-bad:
-	return (-1);
+	return(ruserok(host, (pwd->pw_uid == 0), rusername, lusername));
 }
 
 getstr(buf, cnt, err)
@@ -491,16 +540,35 @@ doremoteterm(term, tp)
 	char *term;
 	struct sgttyb *tp;
 {
-	char *cp = index(term, '/');
-	register int i;
+	register char *cp = index(term, '/'), **cpp;
+	char *speed;
 
 	if (cp) {
-		*cp++ = 0;
-		for (i = 0; i < NSPEEDS; i++)
-			if (!strcmp(speeds[i], cp)) {
-				tp->sg_ispeed = tp->sg_ospeed = i;
+		*cp++ = '\0';
+		speed = cp;
+		cp = index(speed, '/');
+		if (cp)
+			*cp++ = '\0';
+		for (cpp = speeds; cpp < &speeds[NSPEEDS]; cpp++)
+			if (strcmp(*cpp, speed) == 0) {
+				tp->sg_ispeed = tp->sg_ospeed = cpp-speeds;
 				break;
 			}
 	}
 	tp->sg_flags = ECHO|CRMOD|ANYP|XTABS;
 }
+
+tty_gid(default_gid)
+	int default_gid;
+{
+	struct group *getgrnam(), *gr;
+	int gid = default_gid;
+
+	gr = getgrnam(TTYGRPNAME);
+	if (gr != (struct group *) 0)
+		gid = gr->gr_gid;
+
+	endgrent();
+
+	return (gid);
+}