1 files changed, 114 insertions, 0 deletions
diff --git a/lib/libpam/modules/pam_guest/pam_guest.c b/lib/libpam/modules/pam_guest/pam_guest.c
new file mode 100644
index 0000000..110edce
--- /dev/null
+++ b/lib/libpam/modules/pam_guest/pam_guest.c
@@ -0,0 +1,114 @@
+/*-
+ * Copyright (c) 2003 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 <string.h>
+
+#define PAM_SM_AUTH
+
+#include <security/pam_appl.h>
+#include <security/pam_modules.h>
+#include <security/openpam.h>
+
+#define DEFAULT_GUESTS	"guest"
+
+static int
+lookup(const char *str, const char *list)
+{
+	const char *next;
+	size_t len;
+
+	len = strlen(str);
+	while (*list != '\0') {
+		while (*list == ',')
+			++list;
+		if ((next = strchr(list, ',')) == NULL)
+			next = strchr(list, '\0');
+		if (next - list == (ptrdiff_t)len &&
+		    strncmp(list, str, len) == 0)
+			return (1);
+		list = next;
+	}
+	return (0);
+}
+
+PAM_EXTERN int
+pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
+    int argc __unused, const char *argv[] __unused)
+{
+	const char *authtok, *guests, *user;
+	int err, is_guest;
+
+	/* get target account */
+	if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || user == NULL)
+		return (PAM_AUTH_ERR);
+
+	/* get list of guest logins */
+	if ((guests = openpam_get_option(pamh, "guests")) == NULL)
+		guests = DEFAULT_GUESTS;
+
+	/* check if the target account is on the list */
+	is_guest = lookup(user, guests);
+
+	/* check password */
+	if (!openpam_get_option(pamh, "nopass")) {
+		err = pam_get_authtok(pamh, PAM_AUTHTOK, &authtok, NULL);
+		if (err != PAM_SUCCESS)
+			return (err);
+		if (openpam_get_option(pamh, "pass_is_user") &&
+		    strcmp(user, authtok) != 0)
+			return (PAM_AUTH_ERR);
+		if (openpam_get_option(pamh, "pass_as_ruser"))
+			pam_set_item(pamh, PAM_RUSER, authtok);
+	}
+
+	/* done */
+	if (is_guest) {
+		pam_setenv(pamh, "GUEST", user, 1);
+		return (PAM_SUCCESS);
+	}
+	return (PAM_AUTH_ERR);
+}
+
+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_guest");