Add a pam_rhosts module, loosely based on code submitted by Danny Braniss.

Submitted by:	Danny Braniss <danny@cs.huji.ac.il>
Sponsored by:	DARPA, NAI Labs

4 files changed, 196 insertions, 0 deletions

diff --git a/lib/libpam/modules/modules.inc b/lib/libpam/modules/modules.inc
index 2e8eb66..246892d 100644
--- a/lib/libpam/modules/modules.inc
+++ b/lib/libpam/modules/modules.inc
@@ -17,6 +17,7 @@ MODULES		+= pam_opieaccess
 #MODULES		+= pam_passwdqc
 MODULES		+= pam_permit
 MODULES		+= pam_radius
+MODULES		+= pam_rhosts
 MODULES		+= pam_rootok
 MODULES		+= pam_securetty
 MODULES		+= pam_self
diff --git a/lib/libpam/modules/pam_rhosts/Makefile b/lib/libpam/modules/pam_rhosts/Makefile
new file mode 100644
index 0000000..57eb563
--- /dev/null
+++ b/lib/libpam/modules/pam_rhosts/Makefile
@@ -0,0 +1,7 @@
+# $FreeBSD$
+
+LIB=		pam_rhosts
+SRCS=		pam_rhosts.c
+MAN=		pam_rhosts.8
+
+.include <bsd.lib.mk>
diff --git a/lib/libpam/modules/pam_rhosts/pam_rhosts.8 b/lib/libpam/modules/pam_rhosts/pam_rhosts.8
new file mode 100644
index 0000000..5e26866
--- /dev/null
+++ b/lib/libpam/modules/pam_rhosts/pam_rhosts.8
@@ -0,0 +1,95 @@
+.\" Copyright (c) 2001 Mark R V Murray
+.\" All rights reserved.
+.\" Copyright (c) 2001 Networks Associates Technology, Inc.
+.\" All rights reserved.
+.\"
+.\" Portions of this software were developed for the FreeBSD Project by
+.\" ThinkSec AS and NAI Labs, the Security Research Division of Network
+.\" Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
+.\" ("CBOSS"), as part of the DARPA CHATS research program.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. The name of the author may not be used to endorse or promote
+.\"    products derived from this software without specific prior written
+.\"    permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd December 5, 2001
+.Dt PAM_RHOSTS 8
+.Os
+.Sh NAME
+.Nm pam_rhosts
+.Nd Rhosts PAM module
+.Sh SYNOPSIS
+.Op Ar service-name
+.Ar module-type
+.Ar control-flag
+.Pa pam_rhosts
+.Op Ar options
+.Sh DESCRIPTION
+The rhosts authentication service module for PAM,
+.Nm
+provides functionality for only one PAM category:
+authentication.
+In terms of the
+.Ar module-type
+parameter, this is the
+.Dq Li auth
+feature.
+.Ss Rhosts Authentication Module
+The Rhosts authentication component
+.Pq Fn pam_sm_authenticate ,
+returns success if and only if the target user's UID is not 0 and the
+remote host and user are listed in
+.Pa /etc/hosts.equiv 
+or in the target user's
+.Pa ~/.rhosts .
+.Pp
+The following options may be passed to the authentication module:
+.Bl -tag -width ".Cm allow_root"
+.It Cm debug
+.Xr syslog 3
+debugging information at
+.Dv LOG_DEBUG
+level.
+.It Cm no_warn
+suppress warning messages to the user.
+These messages include reasons why the user's authentication attempt
+was declined.
+.It Cm allow_root
+do not automatically fail if the target user's UID is 0.
+.El
+.Sh SEE ALSO
+.Xr hosts.equiv 5 ,
+.Xr pam.conf 5 ,
+.Xr pam 8
+.Sh AUTHORS
+The
+.Nm
+module and this manual page were developed for the
+.Fx
+Project by
+ThinkSec AS and NAI Labs, the Security Research Division of Network
+Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
+.Pq Dq CBOSS ,
+as part of the DARPA CHATS research program.
diff --git a/lib/libpam/modules/pam_rhosts/pam_rhosts.c b/lib/libpam/modules/pam_rhosts/pam_rhosts.c
new file mode 100644
index 0000000..1060fc5
--- /dev/null
+++ b/lib/libpam/modules/pam_rhosts/pam_rhosts.c
@@ -0,0 +1,93 @@
+/*-
+ * Copyright (c) 2002 Danny Braniss
+ * All rights reserved.
+ * Copyright (c) 2001,2002 Networks Associates Technology, Inc.
+ * All rights reserved.
+ *
+ * Portions of this software were developed for the FreeBSD Project by
+ * ThinkSec AS and NAI Labs, the Security Research Division of Network
+ * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
+ * ("CBOSS"), as part of the DARPA CHATS research program.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <pwd.h>
+#include <stddef.h>
+#include <unistd.h>
+
+#define PAM_SM_AUTH
+#include <security/pam_appl.h>
+#include <security/pam_modules.h>
+#include <security/pam_mod_misc.h>
+
+#define OPT_ALLOW_ROOT "allow_root"
+
+PAM_EXTERN int
+pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
+    int argc __unused, const char *argv[] __unused)
+{
+	struct passwd *pw;
+	const char *user, *ruser, *rhost;
+	int err, superuser;
+
+	err = pam_get_user(pamh, &user, NULL);
+	if (err != PAM_SUCCESS)
+		return (err);
+
+	if ((pw = getpwnam(user)) == NULL)
+		return (PAM_USER_UNKNOWN);
+	if (pw->pw_uid == 0 &&
+	    openpam_get_option(pamh, OPT_ALLOW_ROOT) == NULL)
+		return (PAM_AUTH_ERR);
+
+	err = pam_get_item(pamh, PAM_RUSER, (const void **)&ruser);
+	if (err != PAM_SUCCESS)
+		return (PAM_AUTH_ERR);
+
+	err = pam_get_item(pamh, PAM_RHOST, (const void **)&rhost);
+	if (err != PAM_SUCCESS)
+		return (PAM_AUTH_ERR);
+
+	superuser = (strcmp(user, "root") == 0);
+	err = ruserok(rhost, superuser, ruser, user);
+	if (err != 0)
+		return (PAM_AUTH_ERR);
+
+	return (PAM_SUCCESS);
+}
+
+PAM_EXTERN int
+pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
+    int argc __unused, const char *argv[] __unused)
+{
+
+	return (PAM_SUCCESS);
+}
+
+PAM_MODULE_ENTRY("pam_rhosts");