fopen returns pointer, not integer; fix for ANSI C

[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 d9c1f4f..d83752a 100644 (file)
--- 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
 #ifndef lint

-static char *sccsid = "@(#)login.c     4.35 (Berkeley) 85/01/08";
-#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 [ 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>
  */
 
 #include <sys/param.h>


@@ -24,11 +37,16 @@ static      char *sccsid = "@(#)login.c     4.35 (Berkeley) 85/01/08";
 #include <errno.h>
 #include <ttyent.h>
 #include <syslog.h>
 #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        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
 
 #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] = "-";
 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.
  */
 /*
  * 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();
 
 struct passwd *pwd;
 char   *strcat(), *rindex(), *index();


@@ -62,7 +75,6 @@ char  *ttyname();
 char   *crypt();
 char   *getpass();
 char   *stypeof();
 char   *crypt();
 char   *getpass();
 char   *stypeof();

-extern char **environ;

 extern int errno;
 
 struct tchars tc = {
 extern int errno;
 
 struct tchars tc = {


@@ -72,21 +84,27 @@ struct      ltchars ltc = {
        CSUSP, CDSUSP, CRPRNT, CFLUSH, CWERASE, CLNEXT
 };
 
        CSUSP, CDSUSP, CRPRNT, CFLUSH, CWERASE, CLNEXT
 };
 

+struct winsize win = { 0, 0, 0, 0 };
+

 int    rflag;
 int    rflag;

+int    usererr = -1;

 char   rusername[NMAX+1], lusername[NMAX+1];
 char   rpassword[NMAX+1];
 char   name[NMAX+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[];
 {
 char   *rhost;
 
 main(argc, argv)
        char *argv[];
 {

+       extern  char **environ;

        register char *namep;
        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;
        int invalid, quietlog;
        FILE *nlfd;
        char *ttyn, *tty;
        int ldisc = 0, zero = 0;

+       char *p, *domain, *index();

 
        signal(SIGALRM, timedout);
        alarm(timeout);
 
        signal(SIGALRM, timedout);
        alarm(timeout);


@@ -95,20 +113,65 @@ main(argc, argv)
        setpriority(PRIO_PROCESS, 0, 0);
        quota(Q_SETUID, 0, 0, 0);
        /*
        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;
         * -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
         */
         * -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) {
                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]);
                        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);
        }
        ioctl(0, TIOCLSET, &zero);
        ioctl(0, TIOCNXCL, 0);


@@ -122,26 +185,29 @@ main(argc, argv)
         */
        if (rflag)
                doremoteterm(term, &ttyb);
         */
        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);
        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);
                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++;
                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;
        t = 0;

+       invalid = FALSE;

        do {
                ldisc = 0;
                ioctl(0, TIOCSETD, &ldisc);
        do {
                ldisc = 0;
                ioctl(0, TIOCSETD, &ldisc);

-               invalid = FALSE;
-               SCPYN(utmp.ut_name, "");
+               if (fflag == 0)
+                       SCPYN(utmp.ut_name, "");

                /*
                 * Name specified, take it.
                 */
                /*
                 * Name specified, take it.
                 */


@@ -153,23 +219,38 @@ main(argc, argv)
                 * If remote login take given name,
                 * otherwise prompt user for something.
                 */
                 * If remote login take given name,
                 * otherwise prompt user for something.
                 */

-               if (rflag) {
+               if (rflag && !invalid)

                        SCPYN(utmp.ut_name, lusername);
                        SCPYN(utmp.ut_name, lusername);

-                       /* autologin failed, prompt for passwd */
-                       if (rflag == -1)
-                               rflag = 0;
-               } else
+               else {

                        getloginname(&utmp);
                        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 (!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 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);
                        char *pp;
 
                        setpriority(PRIO_PROCESS, 0, -4);


@@ -182,7 +263,7 @@ main(argc, argv)
                /*
                 * If user not super-user, check for logins disabled.
                 */
                /*
                 * 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);
                        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)) {
                 * 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) {
                        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);
                                ioctl(0, TIOCHPCL, (struct sgttyb *) 0);

-                               close(0);
-                               close(1);
-                               close(2);
+                               close(0), close(1), close(2);

                                sleep(10);
                                exit(1);
                        }
                                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.
                 */
                 * 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);
 
                        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",
                if (errno == EUSERS)
                        printf("%s.\n%s.\n",
                           "Too many users logged on already",


@@ -246,17 +337,8 @@ main(argc, argv)
                exit(0);
        }
        time(&utmp.ut_time);
                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;
        quietlog = access(qlog, F_OK) == 0;
        if ((f = open(lastlog, O_RDWR)) >= 0) {
                struct lastlog ll;


@@ -280,34 +362,49 @@ main(argc, argv)
                write(f, (char *) &ll, sizeof ll);
                close(f);
        }
                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);
        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[sizeof("TERM=")-1] == 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')
        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;
        if (!quietlog) {
                struct stat st;

+

                showmotd();
                strcat(maildir, pwd->pw_name);
                if (stat(maildir, &st) == 0 && st.st_size != 0)
                        printf("You have %smail.\n",
                showmotd();
                strcat(maildir, pwd->pw_name);
                if (stat(maildir, &st) == 0 && st.st_size != 0)
                        printf("You have %smail.\n",

-                               (st.st_mtime > st.st_atime) ? "new" : "");
+                               (st.st_mtime > st.st_atime) ? "new " : "");

        }
        signal(SIGALRM, SIG_DFL);
        signal(SIGQUIT, SIG_DFL);
        }
        signal(SIGALRM, SIG_DFL);
        signal(SIGQUIT, SIG_DFL);


@@ -401,65 +498,19 @@ stypeof(ttyid)
 doremotelogin(host)
        char *host;
 {
 doremotelogin(host)
        char *host;
 {

-       FILE *hostf;
-       int first = 1;
-

        getstr(rusername, sizeof (rusername), "remuser");
        getstr(lusername, sizeof (lusername), "locuser");
        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;
        if (getuid()) {
                pwd = &nouser;

-               goto bad;
+               return(-1);

        }
        pwd = getpwnam(lusername);
        if (pwd == NULL) {
                pwd = &nouser;
        }
        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)
 }
 
 getstr(buf, cnt, err)


@@ -489,16 +540,35 @@ doremoteterm(term, tp)
        char *term;
        struct sgttyb *tp;
 {
        char *term;
        struct sgttyb *tp;
 {

-       char *cp = index(term, '/');
-       register int i;
+       register char *cp = index(term, '/'), **cpp;
+       char *speed;

 
        if (cp) {
 
        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;
 }
                                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);
+}