-static char *sccsid = "@(#)login.c 4.2 (Berkeley) %G%";
+static char *sccsid = "@(#)login.c 4.18 82/06/27";
/*
* login [ name ]
+ * login -r
*/
#include <sys/types.h>
#include <stdio.h>
#include <sys/stat.h>
#include <lastlog.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();
CINTR, CQUIT, CSTART, CSTOP, CEOT, CBRK
};
struct ltchars ltc = {
- CTRL(z), CTRL(y), CTRL(r), CTRL(o), CTRL(w), CTRL(v), CTRL(h), CTRL(u),
- CTRL(c)
+ 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 name[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);
nice(-100);
nice(20);
nice(0);
- ioctl(0, TIOCSETD, &ldisc);
- ioctl(0, TIOCLSET, 0);
+ if (argc > 1 && !strcmp(argv[1], "-r")) {
+ rflag++;
+ rhost = argv[2];
+ argc = 1;
+ getstr(rusername, sizeof (rusername), "remuser");
+ getstr(lusername, sizeof (lusername), "locuser");
+ getstr(term+5, sizeof(term)-5, "Terminal type");
+ if (getuid())
+ goto abnormal;
+ setpwent();
+ pwd = getpwnam(lusername);
+ endpwent();
+ if (pwd == NULL) {
+ if (strcmp(rusername, lusername))
+ printf("%s: No such user\r\n", lusername);
+ goto abnormal;
+ }
+ 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 (index(ahost, '\n'))
+ *index(ahost, '\n') = 0;
+ user = index(ahost, ' ');
+ if (user)
+ *user++ = 0;
+ if (!strcmp(rhost, ahost) &&
+ !strcmp(rusername, user ? user : lusername)) {
+ fclose(hostf);
+ goto normal;
+ }
+ }
+ fclose(hostf);
+ }
+ if (first == 1) {
+ first = 0;
+ if (chdir(pwd->pw_dir) < 0)
+ goto again;
+ hostf = fopen(".rhosts", "r");
+ goto again;
+ }
+abnormal:
+ rhost = 0;
+ rflag = -1;
+ }
+normal:
+ ioctl(0, TIOCLSET, &zero);
+ ioctl(0, TIOCNXCL, 0);
+ ioctl(0, FIONBIO, &zero);
+ ioctl(0, FIOASYNC, &zero);
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;
+ }
+ ttyb.sg_erase = CERASE;
+ ttyb.sg_kill = CKILL;
stty(0, &ttyb);
ioctl(0, TIOCSETC, &tc);
ioctl(0, TIOCSLTC, <c);
for (t=3; t<20; t++)
close(t);
ttyn = ttyname(0);
- if (ttyn==0)
+ if (ttyn==(char *)0)
ttyn = "/dev/tty??";
-
- loop:
- 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;
+ do {
+ ldisc = 0;
+ ioctl(0, TIOCSETD, &ldisc);
+ invalid = FALSE;
+ SCPYN(utmp.ut_name, "");
+ if (argc>1) {
+ SCPYN(utmp.ut_name, argv[1]);
+ argc = 0;
}
- }
- setpwent();
- if ((pwd = getpwnam(utmp.ut_name)) == NULL)
- pwd = &nouser;
- endpwent();
- if (*pwd->pw_passwd != '\0') {
- namep = crypt(getpass("Password:"),pwd->pw_passwd);
- if (strcmp(namep, pwd->pw_passwd)) {
-bad:
- printf("Login incorrect\n");
- if (ttyn[LMAX] == 'd') {
- FILE *console = fopen("/dev/console", "w");
- if (console != NULL) {
- fprintf(console, "\r\nBADDIALUP %s %s\r\n", ttyn+5, utmp.ut_name);
- fclose(console);
+ if (rflag) {
+ strcpy(utmp.ut_name, lusername);
+ if (rflag == -1)
+ rflag = 0;
+ } 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;
}
}
- goto loop;
+ if (rhost == 0) {
+ setpwent();
+ if ((pwd = getpwnam(utmp.ut_name)) == NULL)
+ pwd = &nouser;
+ endpwent();
}
- }
- sprintf(user, "USER=%.*s", NMAX, pwd->pw_name);
- if (pwd->pw_uid == 0 && ttyn[5] != 'c')
- goto bad;
- 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 (!strcmp(pwd->pw_shell, "/bin/csh")) {
+ ldisc = NTTYDISC;
+ ioctl(0, TIOCSETD, &ldisc);
}
- }
- if((f = open(lastlog, 2)) >= 0) {
- struct lastlog ll;
-
- lseek(f, 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);
+ 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;
+ }
}
- lseek(f, 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("No directory\n");
- goto loop;
- }
+ 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)) {
+ logerr("ROOT LOGIN REFUSED %s",
+ ttyn+sizeof("/dev/")-1);
+ invalid = TRUE;
+ }
+ if (invalid) {
+ printf("Login incorrect\n");
+ if (ttyn[sizeof("/dev/tty")-1] == 'd')
+ logerr("BADDIALUP %s %s\n",
+ ttyn+sizeof("/dev/")-1, utmp.ut_name);
+ }
+ 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 (rflag && invalid)
+ exit(1);
+ } while (invalid);
+
+
time(&utmp.ut_time);
t = ttyslot();
if (t>0 && (f = open("/etc/utmp", 1)) >= 0) {
write(f, (char *)&utmp, sizeof(utmp));
close(f);
}
+ quietlog = 0;
+ if (access(qlog, 0) == 0)
+ quietlog = 1;
+ if ((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) {
+ if (quietlog == 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);
+ chmod(ttyn, 622);
setgid(pwd->pw_gid);
+ strncpy(name, utmp.ut_name, NMAX);
+ name[NMAX] = '\0';
+ inigrp(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 (term[strlen("TERM=")] == 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
strcat(minusnam, namep);
alarm(0);
umask(022);
- 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");
+ if (ttyn[sizeof("/dev/tty")-1] == 'd')
+ logerr("DIALUP %s %s\n", ttyn+sizeof("/dev/")-1, pwd->pw_name);
+ 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);
}
int stopmotd;
catch()
{
+
signal(SIGINT, SIG_IGN);
stopmotd++;
}
+rootterm(tty)
+ char *tty;
+{
+ register FILE *fd;
+ char buf[100];
+
+ if (rflag)
+ return(1);
+ 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 *
/* 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;
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);
+}
+
+logerr(fmt, a1, a2, a3)
+ char *fmt, *a1, *a2, *a3;
+{
+
+}