6 files changed, 409 insertions, 3 deletions

diff --git a/usr.bin/login/Makefile b/usr.bin/login/Makefile
index 8be09a62f4fc..8b8c35f406d0 100644
--- a/usr.bin/login/Makefile
+++ b/usr.bin/login/Makefile
@@ -2,14 +2,18 @@
 
 #CFLAGS+=-DKERBEROS
 PROG=	login
-SRCS=	login.c
+MAN1=	login.1
+MAN5=	login.access.5
+SRCS=	login.c login_access.c login_skey.c
 #klogin.c
-DPADD=	${LIBUTIL}
+DPADD=	${LIBUTIL} ${LIBSKEY}
 #${LIBKRB} ${LIBDES}
-LDADD=	-lutil -lcrypt
+LDADD=	-lutil -lcrypt -lskey
 #-lkrb -ldes
 BINOWN=	root
 BINMODE=4555
+CFLAGS+=	-DLOGIN_ACCESS -DSKEY -DLOGALL
 INSTALLFLAGS=-fschg
 
 .include <bsd.prog.mk>
+
diff --git a/usr.bin/login/README b/usr.bin/login/README
new file mode 100644
index 000000000000..6ad7a10d4796
--- /dev/null
+++ b/usr.bin/login/README
@@ -0,0 +1,10 @@
+This login has additional functionalities. They are all based on (part of)
+Wietse Venema's logdaemon package.
+
+
+The following defines can be used:
+1) LOGIN_ACCESS to allow access control on a per tty/user combination
+2) SKEY to allow the use of s/key one time passwords
+3) LOGALL to log all logins
+
+-Guido
diff --git a/usr.bin/login/login.access.5 b/usr.bin/login/login.access.5
new file mode 100644
index 000000000000..28d423c9156c
--- /dev/null
+++ b/usr.bin/login/login.access.5
@@ -0,0 +1,50 @@
+.\" this is comment
+.Dd April 30, 1994
+.Dt SKEY.ACCESS 5
+.Os FreeBSD 1.2
+.Sh NAME
+.Nm login.access
+.Nd Login access control table
+.Sh DESCRIPTION
+The
+.Nm login.access
+file specifies (user, host) combinations and/or (user, tty) 
+combinations for which a login will be either accepted or refused.
+.Pp
+When someone logs in, the 
+.Nm login.access
+is scanned for the first entry that
+matches the (user, host) combination, or, in case of non-networked
+logins, the first entry that matches the (user, tty) combination.  The
+permissions field of that table entry determines whether the login will 
+be accepted or refused.
+.Pp
+Each line of the login access control table has three fields separated by a
+":" character:	  permission : users : origins
+
+The first field should be a "+" (access granted) or "-" (access denied)
+character. The second field should be a list of one or more login names,
+group names, or ALL (always matches).  The third field should be a list
+of one or more tty names (for non-networked logins), host names, domain
+names (begin with "."), host addresses, internet network numbers (end
+with "."), ALL (always matches) or LOCAL (matches any string that does
+not contain a "." character). If you run NIS you can use @netgroupname
+in host or user patterns.
+
+The EXCEPT operator makes it possible to write very compact rules.
+
+The group file is searched only when a name does not match that of the
+logged-in user. Only groups are matched in which users are explicitly
+listed: the program does not look at a user's primary group id value.
+.Sh FILES
+.Bl -tag -width /etc/login.access -compact
+.It Pa /etc/login.access
+The
+.Nm login.access
+file resides in
+.Pa /etc .
+.El
+.Sh SEE ALSO
+.Xr login 1
+.Sh AUTHOR
+Guido van Rooij
diff --git a/usr.bin/login/login_access.c b/usr.bin/login/login_access.c
new file mode 100644
index 000000000000..90de8e0ae368
--- /dev/null
+++ b/usr.bin/login/login_access.c
@@ -0,0 +1,236 @@
+ /*
+  * This module implements a simple but effective form of login access
+  * control based on login names and on host (or domain) names, internet
+  * addresses (or network numbers), or on terminal line names in case of
+  * non-networked logins. Diagnostics are reported through syslog(3).
+  * 
+  * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+  */
+
+#ifdef LOGIN_ACCESS
+#ifndef lint
+static char sccsid[] = "%Z% %M% %I% %E% %U%";
+#endif
+
+#include <stdio.h>
+#include <syslog.h>
+#include <ctype.h>
+#include <sys/types.h>
+#include <grp.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#include "pathnames.h"
+
+ /* Delimiters for fields and for lists of users, ttys or hosts. */
+
+static char fs[] = ":";			/* field separator */
+static char sep[] = ", \t";		/* list-element separator */
+
+ /* Constants to be used in assignments only, not in comparisons... */
+
+#define YES             1
+#define NO              0
+
+static int list_match();
+static int user_match();
+static int from_match();
+static int string_match();
+
+/* login_access - match username/group and host/tty with access control file */
+
+login_access(user, from)
+char   *user;
+char   *from;
+{
+    FILE   *fp;
+    char    line[BUFSIZ];
+    char   *perm;			/* becomes permission field */
+    char   *users;			/* becomes list of login names */
+    char   *froms;			/* becomes list of terminals or hosts */
+    int     match = NO;
+    int     end;
+    int     lineno = 0;			/* for diagnostics */
+
+    /*
+     * Process the table one line at a time and stop at the first match.
+     * Blank lines and lines that begin with a '#' character are ignored.
+     * Non-comment lines are broken at the ':' character. All fields are
+     * mandatory. The first field should be a "+" or "-" character. A
+     * non-existing table means no access control.
+     */
+
+    if (fp = fopen(_PATH_LOGACCESS, "r")) {
+	while (!match && fgets(line, sizeof(line), fp)) {
+	    lineno++;
+	    if (line[end = strlen(line) - 1] != '\n') {
+		syslog(LOG_ERR, "%s: line %d: missing newline or line too long",
+		       _PATH_LOGACCESS, lineno);
+		continue;
+	    }
+	    if (line[0] == '#')
+		continue;			/* comment line */
+	    while (end > 0 && isspace(line[end - 1]))
+		end--;
+	    line[end] = 0;			/* strip trailing whitespace */
+	    if (line[0] == 0)			/* skip blank lines */
+		continue;
+	    if (!(perm = strtok(line, fs))
+		|| !(users = strtok((char *) 0, fs))
+		|| !(froms = strtok((char *) 0, fs))
+		|| strtok((char *) 0, fs)) {
+		syslog(LOG_ERR, "%s: line %d: bad field count", _PATH_LOGACCESS,
+		       lineno);
+		continue;
+	    }
+	    if (perm[0] != '+' && perm[0] != '-') {
+		syslog(LOG_ERR, "%s: line %d: bad first field", _PATH_LOGACCESS,
+		       lineno);
+		continue;
+	    }
+	    match = (list_match(froms, from, from_match)
+		     && list_match(users, user, user_match));
+	}
+	(void) fclose(fp);
+    } else if (errno != ENOENT) {
+	syslog(LOG_ERR, "cannot open %s: %m", _PATH_LOGACCESS);
+    }
+    return (match == 0 || (line[0] == '+'));
+}
+
+/* list_match - match an item against a list of tokens with exceptions */
+
+static int list_match(list, item, match_fn)
+char   *list;
+char   *item;
+int   (*match_fn) ();
+{
+    char   *tok;
+    int     match = NO;
+
+    /*
+     * Process tokens one at a time. We have exhausted all possible matches
+     * when we reach an "EXCEPT" token or the end of the list. If we do find
+     * a match, look for an "EXCEPT" list and recurse to determine whether
+     * the match is affected by any exceptions.
+     */
+
+    for (tok = strtok(list, sep); tok != 0; tok = strtok((char *) 0, sep)) {
+	if (strcasecmp(tok, "EXCEPT") == 0)	/* EXCEPT: give up */
+	    break;
+	if (match = (*match_fn) (tok, item))	/* YES */
+	    break;
+    }
+    /* Process exceptions to matches. */
+
+    if (match != NO) {
+	while ((tok = strtok((char *) 0, sep)) && strcasecmp(tok, "EXCEPT"))
+	     /* VOID */ ;
+	if (tok == 0 || list_match((char *) 0, item, match_fn) == NO)
+	    return (match);
+    }
+    return (NO);
+}
+
+/* netgroup_match - match group against machine or user */
+
+static int netgroup_match(group, machine, user)
+char   *machine;
+char   *user;
+{
+#ifdef NIS
+    static char *mydomain = 0;
+
+    if (mydomain == 0)
+	yp_get_default_domain(&mydomain);
+    return (innetgr(group, machine, user, mydomain));
+#else
+    syslog(LOG_ERR, "NIS netgroup support not configured");
+#endif
+}
+
+/* user_match - match a username against one token */
+
+static int user_match(tok, string)
+char   *tok;
+char   *string;
+{
+    struct group *group;
+    int     i;
+
+    /*
+     * If a token has the magic value "ALL" the match always succeeds.
+     * Otherwise, return YES if the token fully matches the username, or if
+     * the token is a group that contains the username.
+     */
+
+    if (tok[0] == '@') {			/* netgroup */
+	return (netgroup_match(tok + 1, (char *) 0, string));
+    } else if (string_match(tok, string)) {	/* ALL or exact match */
+	return (YES);
+    } else if (group = getgrnam(tok)) {		/* try group membership */
+	for (i = 0; group->gr_mem[i]; i++)
+	    if (strcasecmp(string, group->gr_mem[i]) == 0)
+		return (YES);
+    }
+    return (NO);
+}
+
+/* from_match - match a host or tty against a list of tokens */
+
+static int from_match(tok, string)
+char   *tok;
+char   *string;
+{
+    int     tok_len;
+    int     str_len;
+
+    /*
+     * If a token has the magic value "ALL" the match always succeeds. Return
+     * YES if the token fully matches the string. If the token is a domain
+     * name, return YES if it matches the last fields of the string. If the
+     * token has the magic value "LOCAL", return YES if the string does not
+     * contain a "." character. If the token is a network number, return YES
+     * if it matches the head of the string.
+     */
+
+    if (tok[0] == '@') {			/* netgroup */
+	return (netgroup_match(tok + 1, string, (char *) 0));
+    } else if (string_match(tok, string)) {	/* ALL or exact match */
+	return (YES);
+    } else if (tok[0] == '.') {			/* domain: match last fields */
+	if ((str_len = strlen(string)) > (tok_len = strlen(tok))
+	    && strcasecmp(tok, string + str_len - tok_len) == 0)
+	    return (YES);
+    } else if (strcasecmp(tok, "LOCAL") == 0) {	/* local: no dots */
+	if (strchr(string, '.') == 0)
+	    return (YES);
+    } else if (tok[(tok_len = strlen(tok)) - 1] == '.'	/* network */
+	       && strncmp(tok, string, tok_len) == 0) {
+	return (YES);
+    }
+    return (NO);
+}
+
+/* string_match - match a string against one token */
+
+static int string_match(tok, string)
+char   *tok;
+char   *string;
+{
+
+    /*
+     * If the token has the magic value "ALL" the match always succeeds.
+     * Otherwise, return YES if the token fully matches the string.
+     */
+
+    if (strcasecmp(tok, "ALL") == 0) {		/* all: always matches */
+	return (YES);
+    } else if (strcasecmp(tok, string) == 0) {	/* try exact match */
+	return (YES);
+    }
+    return (NO);
+}
+#endif /* LOGIN_ACCES */
diff --git a/usr.bin/login/login_skey.c b/usr.bin/login/login_skey.c
new file mode 100644
index 000000000000..b94bd28ad9cb
--- /dev/null
+++ b/usr.bin/login/login_skey.c
@@ -0,0 +1,105 @@
+ /* Portions taken from the skey distribution on Oct 21 1993 */
+#ifdef SKEY
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <string.h>
+#include <netdb.h>
+#include <arpa/inet.h>
+#include <stdio.h>
+#include <termios.h>
+#include <pwd.h>
+#include <syslog.h>
+
+#include <skey.h>
+
+/* skey_getpass - read regular or s/key password */
+
+char   *skey_getpass(prompt, pwd, pwok)
+char   *prompt;
+struct passwd *pwd;
+int     pwok;
+{
+    static char buf[128];
+    struct skey skey;
+    char   *cp;
+    void    rip();
+    struct termios saved_ttymode;
+    struct termios noecho_ttymode;
+    char   *username = pwd ? pwd->pw_name : "nope";
+    int     sflag;
+
+    /* Attempt an s/key challenge. */
+
+    if ((sflag = skeychallenge(&skey, username, buf)) == 0) {
+	printf("%s\n", buf);
+    }
+    if (!pwok) {
+	printf("(s/key required)\n");
+    }
+    fputs(prompt, stdout);
+    fflush(stdout);
+
+    /* Save current input modes and turn echo off. */
+
+    tcgetattr(0, &saved_ttymode);
+    tcgetattr(0, &noecho_ttymode);
+    noecho_ttymode.c_lflag &= ~ECHO;
+    tcsetattr(0, TCSANOW, &noecho_ttymode);
+
+    /* Read password. */
+
+    buf[0] = 0;
+    fgets(buf, sizeof(buf), stdin);
+    rip(buf);
+
+    /* Restore previous input modes. */
+
+    tcsetattr(0, TCSANOW, &saved_ttymode);
+
+    /* Give S/Key users a chance to do it with echo on. */
+
+    if (sflag == 0 && feof(stdin) == 0 && buf[0] == 0) {
+	fputs(" (turning echo on)\n", stdout);
+	fputs(prompt, stdout);
+	fflush(stdout);
+	fgets(buf, sizeof(buf), stdin);
+	rip(buf);
+    } else {
+	putchar('\n');
+    }
+    return (buf);
+}
+
+/* skey_crypt - return encrypted UNIX passwd if s/key or regular password ok */
+
+char   *skey_crypt(pp, salt, pwd, pwok)
+char   *pp;
+char   *salt;
+struct passwd *pwd;
+int     pwok;
+{
+    struct skey skey;
+    char   *p;
+    char   *crypt();
+
+    /* Try s/key authentication even when the UNIX password is permitted. */
+
+    if (pwd != 0 && skeylookup(&skey, pwd->pw_name) == 0
+	&& skeyverify(&skey, pp) == 0) {
+	/* s/key authentication succeeded */
+	if (skey.n < 5)
+	    printf("Warning! Change s/key password soon\n");
+	return (pwd->pw_passwd);
+    }
+
+    /* When s/key authentication does not work, always invoke crypt(). */
+
+    p = crypt(pp, salt);
+    if (pwok && pwd != 0 && strcmp(p, pwd->pw_passwd) == 0)
+	return (pwd->pw_passwd);
+
+    /* The user does not exist or entered bad input. */
+
+    return (":");
+}
+#endif SKEY
diff --git a/usr.bin/login/pathnames.h b/usr.bin/login/pathnames.h
index a9e1a0779f74..a9f5c1ab17d9 100644
--- a/usr.bin/login/pathnames.h
+++ b/usr.bin/login/pathnames.h
@@ -37,3 +37,4 @@
 
 #define	_PATH_HUSHLOGIN	".hushlogin"
 #define	_PATH_MOTDFILE	"/etc/motd"
+#define _PATH_LOGACCESS	"/etc/login.access"