1 files changed, 258 insertions, 0 deletions
diff --git a/lib/libpam/modules/pam_ftp/pam_ftp.c b/lib/libpam/modules/pam_ftp/pam_ftp.c
new file mode 100644
index 0000000..e99fbd8
--- /dev/null
+++ b/lib/libpam/modules/pam_ftp/pam_ftp.c
@@ -0,0 +1,258 @@
+/*-
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#define	PROMPT		"Password required for %s."
+#define	GUEST_PROMPT	"Guest login ok, send your e-mail address as password."
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <stdarg.h>
+#include <string.h>
+
+#define PAM_SM_AUTH
+#define PAM_SM_ACCOUNT
+#define PAM_SM_SESSION
+#define PAM_SM_PASSWORD
+
+#include <security/pam_appl.h>
+#include <security/pam_modules.h>
+#include <security/pam_mod_misc.h>
+
+enum {
+	PAM_OPT_NO_ANON = PAM_OPT_STD_MAX,
+	PAM_OPT_IGNORE,
+	PAM_OPT_USERS
+};
+
+static struct opttab other_options[] = {
+	{ "no_anon",	PAM_OPT_NO_ANON },
+	{ "ignore",	PAM_OPT_IGNORE },
+	{ "users",	PAM_OPT_USERS },
+	{ NULL, 0 }
+};
+
+static const char *anonusers[] = {"ftp", "anonymous", NULL};
+
+/* Check if *user is in supplied *list or *anonusers[] list.
+ * Place username in *userret
+ * Return 1 if listed 0 otherwise
+ */
+static int 
+lookup(const char *user, char *list, const char **userret)
+{
+	int anon, i;
+	char *item, *context, *locallist;
+
+	anon = 0;
+	*userret = user;		/* this is the default */
+	if (list) {
+		*userret = NULL;
+		locallist = list;
+		while ((item = strtok_r(locallist, ",", &context))) {
+			if (*userret == NULL)
+				*userret = item;
+			if (strcmp(user, item) == 0) {
+				anon = 1;
+				break;
+			}
+			locallist = NULL;
+		}
+	}
+	else {
+		for (i = 0; anonusers[i] != NULL; i++) {
+			if (strcmp(anonusers[i], user) == 0) {
+				*userret = anonusers[0];
+				anon = 1;
+				break;
+			}
+		}
+	}
+	return anon;
+}
+
+/* Check if the user name is 'ftp' or 'anonymous'.
+ * If this is the case, set the PAM_RUSER to the entered email address
+ * and succeed, otherwise fail.
+ */
+PAM_EXTERN int 
+pam_sm_authenticate(pam_handle_t * pamh, int flags __unused, int argc, const char **argv)
+{
+	struct options options;
+	int retval, anon;
+	char *users, *context, *token, *p;
+	const char *user, *prompt;
+
+	pam_std_option(&options, other_options, argc, argv);
+
+	PAM_LOG("Options processed");
+
+	retval = pam_get_user(pamh, &user, NULL);
+	if (retval != PAM_SUCCESS || user == NULL)
+		PAM_RETURN(PAM_USER_UNKNOWN);
+
+	PAM_LOG("Got user: %s", user);
+
+	users = NULL;
+	if (pam_test_option(&options, PAM_OPT_USERS, &users))
+		PAM_LOG("Got extra anonymous users: %s", users);
+
+	anon = 0;
+	if (!pam_test_option(&options, PAM_OPT_NO_ANON, NULL))
+		anon = lookup(user, users, &user);
+
+	PAM_LOG("Done user: %s", user);
+
+	if (anon) {
+		retval = pam_set_item(pamh, PAM_USER, (const void *)user);
+		if (retval != PAM_SUCCESS)
+			PAM_RETURN(retval);
+		prompt = GUEST_PROMPT;
+		PAM_LOG("Doing anonymous");
+	}
+	else {
+		prompt = PROMPT;
+		PAM_LOG("Doing non-anonymous");
+	}
+
+	retval = pam_prompt(pamh, PAM_PROMPT_ECHO_OFF, &token, "%s", prompt);
+	if (retval != PAM_SUCCESS)
+		PAM_RETURN(PAM_AUTHINFO_UNAVAIL);
+
+	PAM_LOG("Got password");
+
+	if (anon) {
+		if (!pam_test_option(&options, PAM_OPT_IGNORE, NULL)) {
+			p = strtok_r(token, "@", &context);
+			if (p != NULL) {
+				pam_set_item(pamh, PAM_RUSER, p);
+				PAM_LOG("Got ruser: %s", p);
+				if (retval == PAM_SUCCESS) {
+					/* XXX XXX XXX */
+					p = strtok_r(NULL, "@", &context);
+					if (p != NULL) {
+						pam_set_item(pamh, PAM_RHOST, p);
+						PAM_LOG("Got rhost: %s", p);
+					}
+				}
+			}
+		}
+		else {
+			PAM_LOG("Ignoring supplied password structure");
+		}
+
+		PAM_LOG("Done anonymous");
+
+		retval = PAM_SUCCESS;
+	}
+	else {
+		pam_set_item(pamh, PAM_AUTHTOK, token);
+
+		PAM_VERBOSE_ERROR("Anonymous module reject");
+
+		PAM_LOG("Done non-anonymous");
+
+		retval = PAM_AUTH_ERR;
+	}
+
+	PAM_RETURN(retval);
+}
+
+PAM_EXTERN int 
+pam_sm_setcred(pam_handle_t * pamh __unused, int flags __unused, int argc, const char **argv)
+{
+	struct options options;
+
+	pam_std_option(&options, other_options, argc, argv);
+
+	PAM_LOG("Options processed");
+
+	PAM_RETURN(PAM_SUCCESS);
+}
+
+PAM_EXTERN int
+pam_sm_acct_mgmt(pam_handle_t *pamh __unused, int flags __unused, int argc ,const char **argv)
+{
+	struct options options;
+
+	pam_std_option(&options, NULL, argc, argv);
+
+	PAM_LOG("Options processed");
+
+	PAM_RETURN(PAM_IGNORE);
+}
+
+PAM_EXTERN int
+pam_sm_chauthtok(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
+{
+	struct options options;
+
+	pam_std_option(&options, NULL, argc, argv);
+
+	PAM_LOG("Options processed");
+
+	PAM_RETURN(PAM_IGNORE);
+}
+
+PAM_EXTERN int
+pam_sm_open_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
+{
+	struct options options;
+
+	pam_std_option(&options, NULL, argc, argv);
+
+	PAM_LOG("Options processed");
+
+	PAM_RETURN(PAM_IGNORE);
+}
+
+PAM_EXTERN int
+pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
+{
+	struct options options;
+
+	pam_std_option(&options, NULL, argc, argv);
+
+	PAM_LOG("Options processed");
+
+	PAM_RETURN(PAM_IGNORE);
+}
+
+PAM_MODULE_ENTRY("pam_ftp");