X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/6f01c4263ca6afdb8b38c10554a3bc5ae6029dbc..b43898148f3c1083924576f519159bf823402512:/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 ed8ccf3256..8f738f0588 100644
--- a/usr/src/usr.bin/login/login.c
+++ b/usr/src/usr.bin/login/login.c
@@ -1,6 +1,8 @@
-static	char *sccsid = "@(#)login.c	4.9 (Berkeley) %G%";
+static	char *sccsid = "@(#)login.c	4.14 82/03/15";
 /*
  * login [ name ]
+ * login -r
+ * login -r [ rhost ]
  */
 
 #include <sys/types.h>
@@ -11,27 +13,40 @@ static	char *sccsid = "@(#)login.c	4.9 (Berkeley) %G%";
 #include <stdio.h>
 #include <sys/stat.h>
 #include <lastlog.h>
-#include <whoami.h>
-#define SCPYN(a, b)	strncpy(a, b, sizeof(a))
 
-#define NMAX sizeof(utmp.ut_name)
-#define LMAX sizeof(utmp.ut_line)
+#define	SCPYN(a, b)	strncpy(a, b, sizeof(a))
 
-char	user[20];
+#define NMAX	sizeof(utmp.ut_name)
+#define LMAX	sizeof(utmp.ut_line)
+
+#define	FALSE	0
+#define	TRUE	-1
+
+char	nolog[] =	"/etc/nologin";
+char	qlog[]  =	".hushlogin";
+char	securetty[] =	"/etc/securetty";
 char	maildir[30] =	"/usr/spool/mail/";
 char	lastlog[] =	"/usr/adm/lastlog";
 struct	passwd nouser = {"", "nope"};
 struct	sgttyb ttyb;
 struct	utmp utmp;
 char	minusnam[16] = "-";
+
 char	homedir[64] = "HOME=";
 char	shell[64] = "SHELL=";
 char	term[64] = "TERM=";
-char	*envinit[] = {homedir, shell, "PATH=:/usr/ucb:/bin:/usr/bin", term, user,0};
-struct	passwd *pwd;
+char	user[20] = "USER=";
+char	*speeds[] =
+    { "0", "50", "75", "110", "134", "150", "200", "300",
+      "600", "1200", "1800", "2400", "4800", "9600", "19200", "38400" };
+#define	NSPEEDS	(sizeof (speeds) / sizeof (speeds[0]))
+
+char	*envinit[] =
+    {homedir, shell, "PATH=:/usr/ucb:/bin:/usr/bin", term, user, 0};
 
+struct	passwd *pwd;
 struct	passwd *getpwnam();
-char	*strcat();
+char	*strcat(), *rindex(), *index();
 int	setpwent();
 char	*ttyname();
 char	*crypt();
@@ -56,13 +71,23 @@ struct	ltchars ltc = {
 	CTRL(z), CTRL(y), CTRL(r), CTRL(o), CTRL(w), CTRL(v)
 };
 
+int	rflag;
+char	rusername[NMAX+1], lusername[NMAX+1];
+char	rpassword[NMAX+1];
+char	*rhost;
+
 main(argc, argv)
 char **argv;
 {
 	register char *namep;
 	int t, f, c;
+	int invalid;
+	int quietlog;
+	int i;
+	FILE *nlfd;
 	char *ttyn;
-	int ldisc = 0;
+	int ldisc = 0, zero = 0;
+	FILE *hostf; int first = 1;
 
 	alarm(60);
 	signal(SIGQUIT, SIG_IGN);
@@ -70,101 +95,186 @@ char **argv;
 	nice(-100);
 	nice(20);
 	nice(0);
-	ioctl(0, TIOCLSET, 0);
+	if (argc > 0 && !strcmp(argv[1], "-r")) {
+		rflag++;
+		if (argc > 1)
+			rhost = argv[2];
+		argc = 1;
+		if (rhost) {
+			getstr(rusername, sizeof (rusername), "remuser");
+			getstr(lusername, sizeof (lusername), "locuser");
+		} else {
+			getstr(lusername, sizeof (lusername), "Username");
+			getstr(rpassword, sizeof (rpassword), "Password");
+		}
+		getstr(term+5, sizeof(term)-5, "Terminal type");
+		if (rhost == 0)
+			goto normal;
+		if (getuid()) {
+			rflag = 0;
+			goto normal;
+		}
+		setpwent();
+		pwd = getpwnam(lusername);
+		if (pwd == NULL) {
+			fprintf(stderr, "Login incorrect.\n");
+			exit(1);
+		}
+		endpwent();
+		hostf = fopen("/etc/hosts.equiv", "r");
+	again:
+		if (hostf) {
+		  char ahost[32];
+		  while (fgets(ahost, sizeof (ahost), hostf)) {
+			char *user;
+			if (index(ahost, '\n'))
+				*index(ahost, '\n') = 0;
+			user = index(ahost, ' ');
+			if (user)
+				*user++ = 0;
+			if (!strcmp(rhost, ahost) &&
+			    !strcmp(rusername, user ? user : lusername))
+				goto normal;
+		  }
+		  fclose(hostf);
+		}
+		if (first == 1) {
+			first = 0;
+			if (chdir(pwd->pw_dir) < 0)
+				goto again;
+			hostf = fopen(".rhosts", "r");
+			goto again;
+		}
+		rhost = 0;
+		rflag = -1;
+	}
+normal:
+	ioctl(0, TIOCLSET, &zero);
 	ioctl(0, TIOCNXCL, 0);
 	gtty(0, &ttyb);
-	ttyb.sg_erase = '#';
-	ttyb.sg_kill = '@';
+	if (rflag) {
+		char *cp = index(term, '/');
+		if (cp) {
+			int i;
+			*cp++ = 0;
+			for (i = 0; i < NSPEEDS; i++)
+				if (!strcmp(speeds[i], cp)) {
+					ttyb.sg_ispeed = ttyb.sg_ospeed = i;
+					break;
+				}
+		}
+		ttyb.sg_flags = ECHO|CRMOD|ANYP|XTABS;
+	}
+	if (rflag == -1)
+		rflag = 0;
+	ttyb.sg_erase = CERASE;
+	ttyb.sg_kill = CKILL;
 	stty(0, &ttyb);
 	ioctl(0, TIOCSETC, &tc);
 	ioctl(0, TIOCSLTC, &ltc);
 	for (t=3; t<20; t++)
 		close(t);
 	ttyn = ttyname(0);
-	if (ttyn==0)
+	if (ttyn==(char *)0)
 		ttyn = "/dev/tty??";
-
-    loop:
-	ldisc = 0;
-	ioctl(0, TIOCSETD, &ldisc);
-	SCPYN(utmp.ut_name, "");
-	if (argc>1) {
-		SCPYN(utmp.ut_name, argv[1]);
-		argc = 0;
-	}
-	while (utmp.ut_name[0] == '\0') {
-		namep = utmp.ut_name;
-		printf("login: ");
-		while ((c = getchar()) != '\n') {
-			if(c == ' ')
-				c = '_';
-			if (c == EOF)
-				exit(0);
-			if (namep < utmp.ut_name+NMAX)
-				*namep++ = c;
-		}
-	}
-	setpwent();
-	if ((pwd = getpwnam(utmp.ut_name)) == NULL)
-		pwd = &nouser;
-	endpwent();
-	if (!strcmp(pwd->pw_shell, "/bin/csh")) {
-		ldisc = NTTYDISC;
+	do {
+		ldisc = 0;
 		ioctl(0, TIOCSETD, &ldisc);
-	}
-	if (*pwd->pw_passwd != '\0') {
-		nice(-4);
-		namep = crypt(getpass("Password:"),pwd->pw_passwd);
-		nice(4);
-		if (strcmp(namep, pwd->pw_passwd)) {
-bad:
+		invalid = FALSE;
+		SCPYN(utmp.ut_name, "");
+		if (argc>1) {
+			SCPYN(utmp.ut_name, argv[1]);
+			argc = 0;
+		}
+		if (rflag)
+			strcpy(utmp.ut_name, lusername);
+		else
+			while (utmp.ut_name[0] == '\0') {
+				namep = utmp.ut_name;
+				{ char hostname[32];
+				  gethostname(hostname, sizeof (hostname));
+				  printf("%s login: ", hostname); }
+				while ((c = getchar()) != '\n') {
+					if (c == ' ')
+						c = '_';
+					if (c == EOF)
+						exit(0);
+					if (namep < utmp.ut_name+NMAX)
+						*namep++ = c;
+				}
+			}
+		if (rhost == 0) {
+			setpwent();
+			if ((pwd = getpwnam(utmp.ut_name)) == NULL)
+				pwd = &nouser;
+			endpwent();
+		}
+		if (!strcmp(pwd->pw_shell, "/bin/csh")) {
+			ldisc = NTTYDISC;
+			ioctl(0, TIOCSETD, &ldisc);
+		}
+		if (rhost == 0) {
+			if (*pwd->pw_passwd != '\0') {
+				char *pp;
+				nice(-4);
+				if (rflag == 0)
+					pp = getpass("Password:");
+				else
+					pp = rpassword;
+				namep = crypt(pp,pwd->pw_passwd);
+				nice(4);
+				if (strcmp(namep, pwd->pw_passwd))
+					invalid = TRUE;
+			}
+		}
+		if (pwd->pw_uid != 0 && (nlfd = fopen(nolog, "r")) > 0) {
+			/* logins are disabled except for root */
+			while ((c = getc(nlfd)) != EOF)
+				putchar(c);
+			fflush(stdout);
+			sleep(5);
+			exit(0);
+		}
+		if (!invalid && pwd->pw_uid == 0 &&
+		    !rootterm(ttyn+sizeof("/dev/")-1)) {
+			FILE *console = fopen("/dev/console", "w");
+			if (console != NULL) {
+				fprintf(console, "\r\nROOT LOGIN REFUSED %s\r\n"
+				    , ttyn+sizeof("/dev/")-1
+				);
+				fclose(console);
+			}
+			invalid = TRUE;
+		}
+		if (invalid) {
 			printf("Login incorrect\n");
-			if (ttyn[LMAX] == 'd') {
+			if (ttyn[sizeof("/dev/tty")-1] == 'd') {
 				FILE *console = fopen("/dev/console", "w");
 				if (console != NULL) {
-					fprintf(console, "\r\nBADDIALUP %s %s\r\n", ttyn+5, utmp.ut_name);
+					fprintf(console, "\r\nBADDIALUP %s %s\r\n"
+					    , ttyn+sizeof("/dev/")-1
+					    , utmp.ut_name);
 					fclose(console);
 				}
 			}
-			goto loop;
 		}
-	}
-	sprintf(user, "USER=%.*s", NMAX, pwd->pw_name);
-#ifdef ERNIE
-	if (pwd->pw_uid == 0 && ttyn[5] != 'c')
-		goto bad;
-#endif
-	if (ttyn[LMAX] == 'd') {
-		FILE *console = fopen("/dev/console", "w");
-		if (console != NULL) {
-			fprintf(console, "\r\nDIALUP %s %s\r\n", ttyn+5, pwd->pw_name);
-			fclose(console);
+		if (*pwd->pw_shell == '\0')
+			pwd->pw_shell = "/bin/sh";
+		i = strlen(pwd->pw_shell);
+		if (chdir(pwd->pw_dir) < 0 && !invalid ) {
+			if (chdir("/") < 0) {
+				printf("No directory!\n");
+				invalid = TRUE;
+			} else {
+				printf("No directory!  Logging in with home=/\n");
+				pwd->pw_dir = "/";
+			}
 		}
-	}
-	if((f = open(lastlog, 2)) >= 0) {
-		struct lastlog ll;
+		if (rflag && invalid)
+			exit(1);
+	} while (invalid);
+
 
-		lseek(f, (long) pwd->pw_uid * sizeof (struct lastlog), 0);
-		if (read(f, (char *) &ll, sizeof ll) == sizeof ll && ll.ll_time != 0) {
-			register char *ep = (char *) ctime(&ll.ll_time);
-			printf("Last login: ");
-			ep[24 - 5] = 0;
-			printf("%s on %.*s\n", ep, LMAX, ll.ll_line);
-		}
-		lseek(f, (long) pwd->pw_uid * sizeof (struct lastlog), 0);
-		time(&ll.ll_time);
-		strcpyn(ll.ll_line, ttyn+5, LMAX);
-		write(f, (char *) &ll, sizeof ll);
-		close(f);
-	}
-	if(chdir(pwd->pw_dir) < 0) {
-	    printf("Logging with home=/\n");
-	    pwd->pw_dir = "/";
-	    if(chdir("/") < 0) {
-		printf("No directory\n");
-		goto loop;
-	    }
-	}
 	time(&utmp.ut_time);
 	t = ttyslot();
 	if (t>0 && (f = open("/etc/utmp", 1)) >= 0) {
@@ -178,39 +288,71 @@ bad:
 		write(f, (char *)&utmp, sizeof(utmp));
 		close(f);
 	}
+	quietlog = FALSE;
+	if (access(qlog, 0) == 0)
+		quietlog = TRUE;
+	if ( !quietlog && (f = open(lastlog, 2)) >= 0 ) {
+		struct lastlog ll;
+
+		lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0);
+		if (read(f, (char *) &ll, sizeof ll) == sizeof ll &&
+		    ll.ll_time != 0) {
+			printf("Last login: %.*s on %.*s\n"
+			    , 24-5
+			    , (char *) ctime(&ll.ll_time)
+			    , sizeof(ll.ll_line)
+			    , ll.ll_line
+			);
+		}
+		lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0);
+		time(&ll.ll_time);
+		SCPYN(ll.ll_line, rindex(ttyn, '/')+1);
+		write(f, (char *) &ll, sizeof ll);
+		close(f);
+	}
 	chown(ttyn, pwd->pw_uid, pwd->pw_gid);
 	setgid(pwd->pw_gid);
+	inigrp(utmp.ut_name, pwd->pw_gid);
 	setuid(pwd->pw_uid);
-	if (*pwd->pw_shell == '\0')
-		pwd->pw_shell = "/bin/sh";
 	environ = envinit;
 	strncat(homedir, pwd->pw_dir, sizeof(homedir)-6);
 	strncat(shell, pwd->pw_shell, sizeof(shell)-7);
-	strncat(term, stypeof(ttyn), sizeof(term)-6);
+	if (rflag == 0)
+		strncat(term, stypeof(ttyn), sizeof(term)-6);
+	strncat(user, pwd->pw_name, sizeof(user)-6);
 	if ((namep = rindex(pwd->pw_shell, '/')) == NULL)
 		namep = pwd->pw_shell;
 	else
 		namep++;
 	strcat(minusnam, namep);
 	alarm(0);
-#ifdef ARPAVAX
-	if (pwd->pw_gid == 31)
-		umask(2);
-	else
-#else
-		umask(022);
-#endif
-	showmotd();
-	strcat(maildir, pwd->pw_name);
-	if(access(maildir,4)==0) {
-		struct stat statb;
-		stat(maildir, &statb);
-		if (statb.st_size)
-			printf("You have mail.\n");
+	umask(022);
+	if (ttyn[sizeof("/dev/tty")-1] == 'd') {
+		FILE *console = fopen("/dev/console", "w");
+		if (console != NULL) {
+			fprintf(console, "\r\nDIALUP %s %s\r\n"
+			    , ttyn+sizeof("/dev/")-1
+			    , pwd->pw_name
+			);
+			fclose(console);
+		}
+	}
+	if ( !quietlog ) {
+		showmotd();
+		strcat(maildir, pwd->pw_name);
+		if (access(maildir,4)==0) {
+			struct stat statb;
+			stat(maildir, &statb);
+			if (statb.st_size)
+				printf("You have mail.\n");
+		}
 	}
+	
 	signal(SIGQUIT, SIG_DFL);
 	signal(SIGINT, SIG_DFL);
+	signal(SIGTSTP, SIG_IGN);
 	execlp(pwd->pw_shell, minusnam, 0);
+	perror(pwd->pw_shell);
 	printf("No shell\n");
 	exit(0);
 }
@@ -222,20 +364,43 @@ catch()
 	stopmotd++;
 }
 
+/*
+ * return true if OK for root to login on this terminal
+ */
+rootterm(tty)
+	char	*tty;
+{
+	register FILE *fd;
+	char	buf[100];
+
+	if ((fd = fopen(securetty, "r")) == NULL)
+		return(1);
+	while (fgets(buf, sizeof buf, fd) != NULL) {
+		buf[strlen(buf)-1] = '\0';
+		if (strcmp(tty, buf) == 0) {
+			fclose(fd);
+			return(1);
+		}
+	}
+	fclose(fd);
+	return(0);
+}
+
 showmotd()
 {
 	FILE *mf;
 	register c;
 
 	signal(SIGINT, catch);
-	if((mf = fopen("/etc/motd","r")) != NULL) {
-		while((c = getc(mf)) != EOF && stopmotd == 0)
+	if ((mf = fopen("/etc/motd","r")) != NULL) {
+		while ((c = getc(mf)) != EOF && stopmotd == 0)
 			putchar(c);
 		fclose(mf);
 	}
 	signal(SIGINT, SIG_IGN);
 }
 
+#undef	UNKNOWN
 #define UNKNOWN "su"
 
 char *
@@ -260,9 +425,11 @@ char	*ttyid;
 	/* scan the file */
 	while (fgets(buf, sizeof buf, f) != NULL)
 	{
-		for (t=buf; *t!=' '; t++)
+		for (t=buf; *t!=' ' && *t != '\t'; t++)
 			;
 		*t++ = 0;
+		while (*t == ' ' || *t == '\t')
+			t++;
 		for (p=t; *p>' '; p++)
 			;
 		*p = 0;
@@ -275,3 +442,21 @@ char	*ttyid;
 	fclose (f);
 	return (UNKNOWN);
 }
+
+getstr(buf, cnt, err)
+	char *buf;
+	int cnt;
+	char *err;
+{
+	char c;
+
+	do {
+		if (read(0, &c, 1) != 1)
+			exit(1);
+		if (--cnt < 0) {
+			printf("%s too long\r\n", err);
+			exit(1);
+		}
+		*buf++ = c;
+	} while (c != 0);
+}