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[unix-history] / 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 ed8ccf3..8f738f0 100644 (file)
--- 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 [ name ]
+ * login -r
+ * login -r [ rhost ]
  */
 
 #include <sys/types.h>
  */
 
 #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 <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   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   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();
 struct passwd *getpwnam();
-char   *strcat();
+char   *strcat(), *rindex(), *index();
 int    setpwent();
 char   *ttyname();
 char   *crypt();
 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)
 };
 
        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;
 main(argc, argv)
 char **argv;
 {
        register char *namep;
        int t, f, c;
+       int invalid;
+       int quietlog;
+       int i;
+       FILE *nlfd;
        char *ttyn;
        char *ttyn;
-       int ldisc = 0;
+       int ldisc = 0, zero = 0;
+       FILE *hostf; int first = 1;
 
        alarm(60);
        signal(SIGQUIT, SIG_IGN);
 
        alarm(60);
        signal(SIGQUIT, SIG_IGN);
@@ -70,101 +95,186 @@ char **argv;
        nice(-100);
        nice(20);
        nice(0);
        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);
        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);
        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??";
                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);
                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");
                        printf("Login incorrect\n");
-                       if (ttyn[LMAX] == 'd') {
+                       if (ttyn[sizeof("/dev/tty")-1] == 'd') {
                                FILE *console = fopen("/dev/console", "w");
                                if (console != NULL) {
                                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);
                                }
                        }
                                        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) {
        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);
        }
                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);
        chown(ttyn, pwd->pw_uid, pwd->pw_gid);
        setgid(pwd->pw_gid);
+       inigrp(utmp.ut_name, pwd->pw_gid);
        setuid(pwd->pw_uid);
        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);
        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);
        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(SIGQUIT, SIG_DFL);
        signal(SIGINT, SIG_DFL);
+       signal(SIGTSTP, SIG_IGN);
        execlp(pwd->pw_shell, minusnam, 0);
        execlp(pwd->pw_shell, minusnam, 0);
+       perror(pwd->pw_shell);
        printf("No shell\n");
        exit(0);
 }
        printf("No shell\n");
        exit(0);
 }
@@ -222,20 +364,43 @@ catch()
        stopmotd++;
 }
 
        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);
 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);
 }
 
                        putchar(c);
                fclose(mf);
        }
        signal(SIGINT, SIG_IGN);
 }
 
+#undef UNKNOWN
 #define UNKNOWN "su"
 
 char *
 #define UNKNOWN "su"
 
 char *
@@ -260,9 +425,11 @@ char       *ttyid;
        /* scan the file */
        while (fgets(buf, sizeof buf, f) != NULL)
        {
        /* scan the file */
        while (fgets(buf, sizeof buf, f) != NULL)
        {
-               for (t=buf; *t!=' '; t++)
+               for (t=buf; *t!=' ' && *t != '\t'; t++)
                        ;
                *t++ = 0;
                        ;
                *t++ = 0;
+               while (*t == ' ' || *t == '\t')
+                       t++;
                for (p=t; *p>' '; p++)
                        ;
                *p = 0;
                for (p=t; *p>' '; p++)
                        ;
                *p = 0;
@@ -275,3 +442,21 @@ char       *ttyid;
        fclose (f);
        return (UNKNOWN);
 }
        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);
+}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.