- markus@cvs.openbsd.org 2001/06/27 04:48:53

[auth.c match.c sshd.8]
     tridge@samba.org

ChangeLog

@@ -83,6 +83,9 @@
    - markus@cvs.openbsd.org 2001/06/27 02:12:54
      [serverloop.c serverloop.h session.c session.h]
      quick hack to make ssh2 work again.
+   - markus@cvs.openbsd.org 2001/06/27 04:48:53
+     [auth.c match.c sshd.8]
+     tridge@samba.org
  
 20010629
  - (bal) Removed net_aton() since we don't use it any more
@@ -5910,4 +5913,4 @@
  - Wrote replacements for strlcpy and mkdtemp
  - Released 1.0pre1
 
-$Id: ChangeLog,v 1.1362 2001/07/04 04:53:53 mouring Exp $
+$Id: ChangeLog,v 1.1363 2001/07/04 04:56:44 mouring Exp $

auth.c

@@ -23,7 +23,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: auth.c,v 1.25 2001/06/25 17:54:48 provos Exp $");
+RCSID("$OpenBSD: auth.c,v 1.26 2001/06/27 04:48:52 markus Exp $");
 
 #ifdef HAVE_LOGIN_H
 #include <login.h>
@@ -65,6 +65,7 @@ int
 allowed_user(struct passwd * pw)
 {
 	struct stat st;
+	const char *hostname = NULL, *ipaddr = NULL;
 	char *shell;
 	int i;
 #ifdef WITH_AIXAUTHENTICATE
@@ -109,16 +110,23 @@ allowed_user(struct passwd * pw)
 	if (!((st.st_mode & S_IFREG) && (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP))))
 		return 0;
 
+	if (options.num_deny_users > 0 || options.num_allow_users > 0) {
+		hostname = get_canonical_hostname(options.reverse_mapping_check);
+		ipaddr = get_remote_ipaddr();
+	}
+
 	/* Return false if user is listed in DenyUsers */
 	if (options.num_deny_users > 0) {
 		for (i = 0; i < options.num_deny_users; i++)
-			if (match_pattern(pw->pw_name, options.deny_users[i]))
+			if (match_user(pw->pw_name, hostname, ipaddr,
+			    options.deny_users[i]))
 				return 0;
 	}
 	/* Return false if AllowUsers isn't empty and user isn't listed there */
 	if (options.num_allow_users > 0) {
 		for (i = 0; i < options.num_allow_users; i++)
-			if (match_pattern(pw->pw_name, options.allow_users[i]))
+			if (match_user(pw->pw_name, hostname, ipaddr,
+			    options.allow_users[i]))
 				break;
 		/* i < options.num_allow_users iff we break for loop */
 		if (i >= options.num_allow_users)

match.c

@@ -35,7 +35,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: match.c,v 1.13 2001/06/24 05:25:10 markus Exp $");
+RCSID("$OpenBSD: match.c,v 1.14 2001/06/27 04:48:53 markus Exp $");
 
 #include "match.h"
 #include "xmalloc.h"
@@ -184,6 +184,30 @@ match_host_and_ip(const char *host, const char *ipaddr,
 	return 1;
 }
 
+/*
+ * match user, user@host_or_ip, user@host_or_ip_list against pattern
+ */
+int
+match_user(const char *user, const char *host, const char *ipaddr,
+    const char *pattern)
+{
+	char *p, *pat;
+	int ret;
+
+	if ((p = strchr(pattern,'@')) == NULL)
+		return match_pattern(user, pattern);
+
+	pat = xstrdup(pattern);
+	p = strchr(pat, '@');
+	*p++ = '\0';
+
+	if ((ret = match_pattern(user, pat)) == 1)
+		ret = match_host_and_ip(host, ipaddr, p);
+	xfree(pat);
+
+	return ret;
+}
+
 /*
  * Returns first item from client-list that is also supported by server-list,
  * caller must xfree() returned string.

sshd.8

@@ -34,7 +34,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.\" $OpenBSD: sshd.8,v 1.134 2001/06/26 05:48:07 mpech Exp $
+.\" $OpenBSD: sshd.8,v 1.135 2001/06/27 04:48:53 markus Exp $
 .Dd September 25, 1999
 .Dt SSHD 8
 .Os
@@ -329,6 +329,9 @@ can be used as
 wildcards in the patterns.
 Only user names are valid; a numerical user ID isn't recognized.
 By default login is allowed regardless of the user name.
+If the pattern takes the form USER@HOST then USER and HOST
+are separately checked, allowing you to restrict logins to particular
+users from particular hosts.
 .Pp
 .It Cm AuthorizedKeysFile
 Specifies the file that contains the public RSA keys that can be used