Adding upstream version 3.2.1+dfsg.upstream/3.2.1+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 890 insertions, 0 deletions

diff --git a/src/main/auth.c b/src/main/auth.c
new file mode 100644
index 0000000..76f87b7
--- /dev/null
+++ b/src/main/auth.c
@@ -0,0 +1,890 @@
+/*
+ * auth.c	User authentication.
+ *
+ * Version:	$Id$
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ *
+ * Copyright 2000,2006  The FreeRADIUS server project
+ * Copyright 2000  Miquel van Smoorenburg <miquels@cistron.nl>
+ * Copyright 2000  Jeff Carneal <jeff@apex.net>
+ */
+RCSID("$Id$")
+
+#include <freeradius-devel/radiusd.h>
+#include <freeradius-devel/modules.h>
+#include <freeradius-devel/state.h>
+#include <freeradius-devel/rad_assert.h>
+
+#include <ctype.h>
+
+/*
+ *	Return a short string showing the terminal server, port
+ *	and calling station ID.
+ */
+char *auth_name(char *buf, size_t buflen, REQUEST *request, bool do_cli)
+{
+	VALUE_PAIR	*cli;
+	VALUE_PAIR	*pair;
+	uint32_t	port = 0;	/* RFC 2865 NAS-Port is 4 bytes */
+	char const	*tls = "";
+
+	if ((cli = fr_pair_find_by_num(request->packet->vps, PW_CALLING_STATION_ID, 0, TAG_ANY)) == NULL) {
+		do_cli = false;
+	}
+
+	if ((pair = fr_pair_find_by_num(request->packet->vps, PW_NAS_PORT, 0, TAG_ANY)) != NULL) {
+		port = pair->vp_integer;
+	}
+
+	if (request->packet->dst_port == 0) {
+		if (fr_pair_find_by_num(request->packet->vps, PW_FREERADIUS_PROXIED_TO, 0, TAG_ANY)) {
+			tls = " via TLS tunnel";
+		} else {
+			tls = " via proxy to virtual server";
+		}
+	}
+
+	snprintf(buf, buflen, "from client %.128s port %u%s%.128s%s",
+			request->client->shortname, port,
+		 (do_cli ? " cli " : ""), (do_cli ? cli->vp_strvalue : ""),
+		 tls);
+
+	return buf;
+}
+
+
+
+/*
+ * Make sure user/pass are clean
+ * and then log them
+ */
+static int rad_authlog(char const *msg, REQUEST *request, int goodpass)
+{
+	int logit;
+	char const *extra_msg = NULL;
+	char clean_password[1024];
+	char clean_username[1024];
+	char buf[1024];
+	char extra[1024];
+	char *p;
+	VALUE_PAIR *username = NULL;
+
+	if ((request->reply->code == PW_CODE_ACCESS_ACCEPT) && !request->root->log_accept) {
+		return 0;
+	}
+
+	if ((request->reply->code == PW_CODE_ACCESS_REJECT) && !request->root->log_reject) {
+		return 0;
+	}
+
+	/*
+	 * Get the correct username based on the configured value
+	 */
+	if (!log_stripped_names) {
+		username = fr_pair_find_by_num(request->packet->vps, PW_USER_NAME, 0, TAG_ANY);
+	} else {
+		username = request->username;
+	}
+
+	/*
+	 *	Clean up the username
+	 */
+	if (username == NULL) {
+		strcpy(clean_username, "<no User-Name attribute>");
+	} else {
+		fr_prints(clean_username, sizeof(clean_username), username->vp_strvalue, username->vp_length, '\0');
+	}
+
+	/*
+	 *	Clean up the password
+	 */
+	if (request->root->log_auth_badpass || request->root->log_auth_goodpass) {
+		if (!request->password) {
+			VALUE_PAIR *auth_type;
+
+			auth_type = fr_pair_find_by_num(request->config, PW_AUTH_TYPE, 0, TAG_ANY);
+			if (auth_type) {
+				snprintf(clean_password, sizeof(clean_password),
+					 "<via Auth-Type = %s>",
+					 dict_valnamebyattr(PW_AUTH_TYPE, 0,
+							    auth_type->vp_integer));
+			} else {
+				strcpy(clean_password, "<no User-Password attribute>");
+			}
+		} else if (fr_pair_find_by_num(request->packet->vps, PW_CHAP_PASSWORD, 0, TAG_ANY)) {
+			strcpy(clean_password, "<CHAP-Password>");
+		} else {
+			fr_prints(clean_password, sizeof(clean_password),
+				  request->password->vp_strvalue, request->password->vp_length, '\0');
+		}
+	}
+
+	if (goodpass) {
+		logit = request->root->log_auth_goodpass;
+		extra_msg = request->root->auth_goodpass_msg;
+	} else {
+		logit = request->root->log_auth_badpass;
+		extra_msg = request->root->auth_badpass_msg;
+	}
+
+	if (extra_msg) {
+		extra[0] = ' ';
+		p = extra + 1;
+		if (radius_xlat(p, sizeof(extra) - 1, request, extra_msg, NULL, NULL) < 0) {
+			return -1;
+		}
+	} else {
+		*extra = '\0';
+	}
+
+	RAUTH("%s: [%s%s%s] (%s)%s",
+		       msg,
+		       clean_username,
+		       logit ? "/" : "",
+		       logit ? clean_password : "",
+		       auth_name(buf, sizeof(buf), request, 1),
+		       extra);
+
+	return 0;
+}
+
+/*
+ *	Check password.
+ *
+ *	Returns:	0  OK
+ *			-1 Password fail
+ *			-2 Rejected (Auth-Type = Reject, send Port-Message back)
+ *			1  End check & return, don't reply
+ *
+ *	NOTE: NOT the same as the RLM_ values !
+ */
+static int CC_HINT(nonnull) rad_check_password(REQUEST *request)
+{
+	vp_cursor_t cursor;
+	VALUE_PAIR *auth_type_pair;
+	int auth_type = -1;
+	int result;
+	int auth_type_count = 0;
+
+	/*
+	 *	Look for matching check items. We skip the whole lot
+	 *	if the authentication type is PW_AUTH_TYPE_ACCEPT or
+	 *	PW_AUTH_TYPE_REJECT.
+	 */
+	fr_cursor_init(&cursor, &request->config);
+	while ((auth_type_pair = fr_cursor_next_by_num(&cursor, PW_AUTH_TYPE, 0, TAG_ANY))) {
+		auth_type = auth_type_pair->vp_integer;
+		auth_type_count++;
+
+		RDEBUG2("Found Auth-Type = %s", dict_valnamebyattr(PW_AUTH_TYPE, 0, auth_type));
+		if (auth_type == PW_AUTH_TYPE_REJECT) {
+			RDEBUG2("Auth-Type = Reject, rejecting user");
+
+			return -2;
+		}
+	}
+
+	/*
+	 *	Warn if more than one Auth-Type was found, because only the last
+	 *	one found will actually be used.
+	 */
+	if ((auth_type_count > 1) && (rad_debug_lvl) && request->username) {
+		RERROR("Warning:  Found %d auth-types on request for user '%s'",
+			auth_type_count, request->username->vp_strvalue);
+	}
+
+	/*
+	 *	This means we have a proxy reply or an accept and it wasn't
+	 *	rejected in the above loop. So that means it is accepted and we
+	 *	do no further authentication.
+	 */
+	if ((auth_type == PW_AUTH_TYPE_ACCEPT)
+#ifdef WITH_PROXY
+	    || (request->proxy)
+#endif
+	    ) {
+		RDEBUG2("Auth-Type = Accept, accepting the user");
+		return 0;
+	}
+
+	/*
+	 *	Check that Auth-Type has been set, and reject if not.
+	 *
+	 *	Do quick checks to see if Cleartext-Password or Crypt-Password have
+	 *	been set, and complain if so.
+	 */
+	if (auth_type < 0) {
+		if (fr_pair_find_by_num(request->config, PW_CRYPT_PASSWORD, 0, TAG_ANY) != NULL) {
+			RWDEBUG2("No module configured to handle comparisons with &control:Crypt-Password");
+			RWDEBUG2("Add pap to the authorize { ... } and authenticate { ... } sections of this "
+				 "virtual server to handle this \"known good\" password type");
+		}
+		else if (fr_pair_find_by_num(request->config, PW_CLEARTEXT_PASSWORD, 0, TAG_ANY) != NULL) {
+			RWDEBUG2("No module configured to handle comparisons with &control:Cleartext-Password");
+			RWDEBUG2("Add pap or chap to the authorize { ... } and authenticate { ... } sections "
+				 "of this virtual server to handle this \"known good\" password type");
+		}
+
+		/*
+		 *	The admin hasn't told us how to
+		 *	authenticate the user, so we reject them!
+		 *
+		 *	This is fail-safe.
+		 */
+
+		REDEBUG2("No Auth-Type found: rejecting the user via Post-Auth-Type = Reject");
+		return -2;
+	}
+
+	/*
+	 *	See if there is a module that handles
+	 *	this Auth-Type, and turn the RLM_ return
+	 *	status into the values as defined at
+	 *	the top of this function.
+	 */
+	result = process_authenticate(auth_type, request);
+	switch (result) {
+	/*
+	 *	An authentication module FAIL
+	 *	return code, or any return code that
+	 *	is not expected from authentication,
+	 *	is the same as an explicit REJECT!
+	 */
+	case RLM_MODULE_FAIL:
+	case RLM_MODULE_INVALID:
+	case RLM_MODULE_NOOP:
+	case RLM_MODULE_NOTFOUND:
+	case RLM_MODULE_REJECT:
+	case RLM_MODULE_UPDATED:
+	case RLM_MODULE_USERLOCK:
+	default:
+		result = -1;
+		break;
+
+	case RLM_MODULE_OK:
+		result = 0;
+		break;
+
+	case RLM_MODULE_HANDLED:
+		result = 1;
+		break;
+	}
+
+	return result;
+}
+
+/*
+ *	Post-authentication step processes the response before it is
+ *	sent to the NAS. It can receive both Access-Accept and Access-Reject
+ *	replies.
+ */
+int rad_postauth(REQUEST *request)
+{
+	int	result;
+	int	postauth_type = 0;
+	VALUE_PAIR *vp;
+
+	if (request->reply->code == PW_CODE_ACCESS_CHALLENGE) {
+		fr_pair_delete_by_num(&request->config, PW_POST_AUTH_TYPE, 0, TAG_ANY);
+		vp = pair_make_config("Post-Auth-Type", "Challenge", T_OP_SET);
+		if (!vp) return RLM_MODULE_OK;
+
+	} else if (request->reply->code == PW_CODE_ACCESS_REJECT) {
+		fr_pair_delete_by_num(&request->config, PW_POST_AUTH_TYPE, 0, TAG_ANY);
+		vp = pair_make_config("Post-Auth-Type", "Reject", T_OP_SET);
+		if (!vp) return RLM_MODULE_OK;
+
+	} else {
+		vp = fr_pair_find_by_num(request->config, PW_POST_AUTH_TYPE, 0, TAG_ANY);
+	}
+
+	/*
+	 *	If a method was chosen, use that.
+	 */
+	if (vp) {
+		postauth_type = vp->vp_integer;
+		RDEBUG2("Using Post-Auth-Type %s",
+			dict_valnamebyattr(PW_POST_AUTH_TYPE, 0, postauth_type));
+	}
+
+	result = process_post_auth(postauth_type, request);
+	switch (result) {
+	/*
+	 *	The module failed, or said to reject the user: Do so.
+	 */
+	case RLM_MODULE_FAIL:
+	case RLM_MODULE_INVALID:
+	case RLM_MODULE_REJECT:
+	case RLM_MODULE_USERLOCK:
+	default:
+		/*
+		 *	We WERE going to have a nice reply, but
+		 *	something went wrong.  So we've got to run
+		 *	Post-Auth-Type Reject.
+		 */
+		if (request->reply->code != PW_CODE_ACCESS_REJECT) {
+			RDEBUG("Using Post-Auth-Type Reject");
+
+			request->reply->code = PW_CODE_ACCESS_REJECT;
+			process_post_auth(PW_POST_AUTH_TYPE_REJECT, request);
+		}
+
+		/*
+		 *	Only discard session state when we're sending
+		 *	packets to the network.  The State attribute
+		 *	is use both for the outer session and copied
+		 *	to the inner-tunnel session for (e.g.) PEAP.
+		 *	So we don't want to delete the information in
+		 *	the inner tunnel, and then have it no longer
+		 *	accessible from the outer session.
+		 */
+		if (!request->parent) fr_state_discard(request, request->packet);
+		result = RLM_MODULE_REJECT;
+		break;
+	/*
+	 *	The module handled the request, cancel the reply.
+	 */
+	case RLM_MODULE_HANDLED:
+		/* FIXME */
+		break;
+	/*
+	 *	The module had a number of OK return codes.
+	 */
+	case RLM_MODULE_NOOP:
+	case RLM_MODULE_NOTFOUND:
+	case RLM_MODULE_OK:
+	case RLM_MODULE_UPDATED:
+		result = RLM_MODULE_OK;
+
+		if (request->reply->code == PW_CODE_ACCESS_CHALLENGE) {
+			fr_state_put_vps(request, request->packet, request->reply);
+
+		} else {
+			fr_state_discard(request, request->packet);
+		}
+		break;
+	}
+
+	/*
+	 *	Rejects during authorize, etc. are handled by the
+	 *	earlier code, which logs a reason for the rejection.
+	 *	If the packet is rejected in post-auth, we need to log
+	 *	that as a separate reason.
+	 */
+	if (result == RLM_MODULE_REJECT) {
+		if (request->reply->code != RLM_MODULE_REJECT) {
+			rad_authlog("Rejected in post-auth", request, 0);
+		}
+		request->reply->code = PW_CODE_ACCESS_REJECT;
+	}
+
+	if (request->reply->code == PW_CODE_ACCESS_REJECT) {
+		if ((vp = fr_pair_find_by_num(request->packet->vps, PW_MODULE_FAILURE_MESSAGE, 0, TAG_ANY)) != NULL) {
+			char msg[MAX_STRING_LEN+19];
+
+			snprintf(msg, sizeof(msg), "Login incorrect (%s)",
+				 vp->vp_strvalue);
+			rad_authlog(msg, request, 0);
+		} else {
+			rad_authlog("Login incorrect", request, 0);
+		}
+	}
+
+	/*
+	 *	If we're still accepting the user, say so.
+	 */
+	if (request->reply->code == PW_CODE_ACCESS_ACCEPT) {
+		if ((vp = fr_pair_find_by_num(request->packet->vps, PW_MODULE_SUCCESS_MESSAGE, 0, TAG_ANY)) != NULL) {
+			char msg[MAX_STRING_LEN+12];
+
+			snprintf(msg, sizeof(msg), "Login OK (%s)",
+				 vp->vp_strvalue);
+			rad_authlog(msg, request, 1);
+		} else {
+			rad_authlog("Login OK", request, 1);
+		}
+	}
+
+	return result;
+}
+
+/*
+ *	Process and reply to an authentication request
+ *
+ *	The return value of this function isn't actually used right now, so
+ *	it's not entirely clear if it is returning the right things. --Pac.
+ */
+int rad_authenticate(REQUEST *request)
+{
+#ifdef WITH_SESSION_MGMT
+	VALUE_PAIR	*check_item;
+#endif
+	VALUE_PAIR	*module_msg;
+	VALUE_PAIR	*tmp = NULL;
+	int		result;
+	char		autz_retry = 0;
+	int		autz_type = 0;
+
+#ifdef WITH_PROXY
+	/*
+	 *	If this request got proxied to another server, we need
+	 *	to check whether it authenticated the request or not.
+	 *
+	 *	request->proxy gets set only AFTER authorization, so
+	 *	it's safe to check it here.  If it exists, it means
+	 *	we're doing a second pass through rad_authenticate().
+	 */
+	if (request->proxy) {
+		int code = 0;
+
+		if (request->proxy_reply) code = request->proxy_reply->code;
+
+		switch (code) {
+		/*
+		 *	Reply of ACCEPT means accept, thus set Auth-Type
+		 *	accordingly.
+		 */
+		case PW_CODE_ACCESS_ACCEPT:
+			tmp = radius_pair_create(request,
+						&request->config,
+						PW_AUTH_TYPE, 0);
+			if (tmp) tmp->vp_integer = PW_AUTH_TYPE_ACCEPT;
+			goto authenticate;
+
+		/*
+		 *	Challenges are punted back to the NAS without any
+		 *	further processing.
+		 */
+		case PW_CODE_ACCESS_CHALLENGE:
+			request->reply->code = PW_CODE_ACCESS_CHALLENGE;
+			fr_state_put_vps(request, request->packet, request->reply);
+			return RLM_MODULE_OK;
+
+		/*
+		 *	ALL other replies mean reject. (this is fail-safe)
+		 *
+		 *	Do NOT do any authorization or authentication. They
+		 *	are being rejected, so we minimize the amount of work
+		 *	done by the server, by rejecting them here.
+		 */
+		case PW_CODE_ACCESS_REJECT:
+			request->reply->code = PW_CODE_ACCESS_REJECT;
+			rad_authlog("Login incorrect (Home Server says so)",
+				    request, 0);
+			return RLM_MODULE_REJECT;
+
+		default:
+			rad_authlog("Login incorrect (Home Server failed to respond)",
+				    request, 0);
+			return RLM_MODULE_REJECT;
+		}
+	}
+#endif
+	/*
+	 *	Look for, and cache, passwords.
+	 */
+	if (!request->password) {
+		request->password = fr_pair_find_by_num(request->packet->vps, PW_USER_PASSWORD, 0, TAG_ANY);
+	}
+	if (!request->password) {
+		request->password = fr_pair_find_by_num(request->packet->vps, PW_CHAP_PASSWORD, 0, TAG_ANY);
+	}
+
+	/*
+	 *	Grab the VPS associated with the State attribute.
+	 */
+	fr_state_get_vps(request, request->packet);
+
+	/*
+	 *	Get the user's authorization information from the database
+	 */
+autz_redo:
+	result = process_authorize(autz_type, request);
+	switch (result) {
+	case RLM_MODULE_NOOP:
+	case RLM_MODULE_NOTFOUND:
+	case RLM_MODULE_OK:
+	case RLM_MODULE_UPDATED:
+		break;
+	case RLM_MODULE_HANDLED:
+		return result;
+	case RLM_MODULE_FAIL:
+	case RLM_MODULE_INVALID:
+	case RLM_MODULE_REJECT:
+	case RLM_MODULE_USERLOCK:
+	default:
+		request->reply->code = PW_CODE_ACCESS_REJECT;
+		if ((module_msg = fr_pair_find_by_num(request->packet->vps, PW_MODULE_FAILURE_MESSAGE, 0, TAG_ANY)) != NULL) {
+			char msg[MAX_STRING_LEN + 16];
+			snprintf(msg, sizeof(msg), "Invalid user (%s)",
+				 module_msg->vp_strvalue);
+			rad_authlog(msg,request,0);
+		} else {
+			rad_authlog("Invalid user", request, 0);
+		}
+		return result;
+	}
+	if (!autz_retry) {
+		tmp = fr_pair_find_by_num(request->config, PW_AUTZ_TYPE, 0, TAG_ANY);
+		if (tmp) {
+			autz_type = tmp->vp_integer;
+			RDEBUG2("Using Autz-Type %s",
+				dict_valnamebyattr(PW_AUTZ_TYPE, 0, autz_type));
+			autz_retry = 1;
+			goto autz_redo;
+		}
+	}
+
+	/*
+	 *	If we haven't already proxied the packet, then check
+	 *	to see if we should.  Maybe one of the authorize
+	 *	modules has decided that a proxy should be used. If
+	 *	so, get out of here and send the packet.
+	 */
+#ifdef WITH_PROXY
+	if (request->proxy == NULL)
+#endif
+	{
+		if ((tmp = fr_pair_find_by_num(request->config, PW_PROXY_TO_REALM, 0, TAG_ANY)) != NULL) {
+			REALM *realm;
+
+			realm = realm_find2(tmp->vp_strvalue);
+
+			/*
+			 *	Don't authenticate, as the request is going to
+			 *	be proxied.
+			 */
+			if (realm && realm->auth_pool) {
+				return RLM_MODULE_OK;
+			}
+
+			/*
+			 *	Catch users who set Proxy-To-Realm to a LOCAL
+			 *	realm (sigh).  But don't complain if it is
+			 *	*the* LOCAL realm.
+			 */
+			if (realm && (strcmp(realm->name, "LOCAL") != 0)) {
+				RWDEBUG2("You set Proxy-To-Realm = %s, but it is a LOCAL realm!  Cancelling proxy request.", realm->name);
+			}
+
+			if (!realm) {
+				RWDEBUG2("You set Proxy-To-Realm = %s, but the realm does not exist!  Cancelling invalid proxy request.", tmp->vp_strvalue);
+			}
+		} else if (((tmp = fr_pair_find_by_num(request->config, PW_HOME_SERVER_POOL, 0, TAG_ANY)) != NULL) ||
+			  ((tmp = fr_pair_find_by_num(request->config, PW_PACKET_DST_IP_ADDRESS, 0, TAG_ANY)) != NULL) ||
+			  ((tmp = fr_pair_find_by_num(request->config, PW_PACKET_DST_IPV6_ADDRESS, 0, TAG_ANY)) != NULL) ||
+			  ((tmp = fr_pair_find_by_num(request->config, PW_HOME_SERVER_NAME, 0, TAG_ANY)) != NULL)) {
+			RDEBUG("Proxying due to %s", tmp->da->name);
+			return RLM_MODULE_OK;
+		}
+	}
+
+#ifdef WITH_PROXY
+authenticate:
+#endif
+
+	/*
+	 *	Validate the user
+	 */
+	do {
+		result = rad_check_password(request);
+		if (result > 0) {
+			return RLM_MODULE_HANDLED;
+		}
+
+	} while(0);
+
+	/*
+	 *	Failed to validate the user.
+	 *
+	 *	We PRESUME that the code which failed will clean up
+	 *	request->reply->vps, to be ONLY the reply items it
+	 *	wants to send back.
+	 */
+	if (result < 0) {
+		RDEBUG2("Failed to authenticate the user");
+		request->reply->code = PW_CODE_ACCESS_REJECT;
+
+		if (request->password) {
+			VERIFY_VP(request->password);
+			/* double check: maybe the secret is wrong? */
+			if ((rad_debug_lvl > 1) && (request->password->da->attr == PW_USER_PASSWORD)) {
+				uint8_t const *p;
+
+				p = (uint8_t const *) request->password->vp_strvalue;
+				while (*p) {
+					int size;
+
+					size = fr_utf8_char(p, -1);
+					if (!size) {
+						RWDEBUG("Unprintable characters in the password.  Double-check the "
+							"shared secret on the server and the NAS!");
+						break;
+					}
+					p += size;
+				}
+			}
+		}
+	}
+
+#ifdef WITH_SESSION_MGMT
+	if (result >= 0 &&
+	    (check_item = fr_pair_find_by_num(request->config, PW_SIMULTANEOUS_USE, 0, TAG_ANY)) != NULL) {
+		int r, session_type = 0;
+		char		logstr[1024];
+		char		umsg[MAX_STRING_LEN + 1];
+
+		tmp = fr_pair_find_by_num(request->config, PW_SESSION_TYPE, 0, TAG_ANY);
+		if (tmp) {
+			session_type = tmp->vp_integer;
+			RDEBUG2("Using Session-Type %s",
+				dict_valnamebyattr(PW_SESSION_TYPE, 0, session_type));
+		}
+
+		/*
+		 *	User authenticated O.K. Now we have to check
+		 *	for the Simultaneous-Use parameter.
+		 */
+		if (request->username &&
+		    (r = process_checksimul(session_type, request, check_item->vp_integer)) != 0) {
+			char mpp_ok = 0;
+
+			if (r == 2){
+				/* Multilink attempt. Check if port-limit > simultaneous-use */
+				VALUE_PAIR *port_limit;
+
+				if ((port_limit = fr_pair_find_by_num(request->reply->vps, PW_PORT_LIMIT, 0, TAG_ANY)) != NULL &&
+					port_limit->vp_integer > check_item->vp_integer){
+					RDEBUG2("MPP is OK");
+					mpp_ok = 1;
+				}
+			}
+			if (!mpp_ok){
+				if (check_item->vp_integer > 1) {
+					snprintf(umsg, sizeof(umsg), "%s (%u)", main_config.denied_msg,
+						 check_item->vp_integer);
+				} else {
+					strlcpy(umsg, main_config.denied_msg, sizeof(umsg));
+				}
+
+				request->reply->code = PW_CODE_ACCESS_REJECT;
+
+				/*
+				 *	They're trying to log in too many times.
+				 *	Remove ALL reply attributes.
+				 */
+				fr_pair_list_free(&request->reply->vps);
+				pair_make_reply("Reply-Message", umsg, T_OP_SET);
+
+				snprintf(logstr, sizeof(logstr), "Multiple logins (max %d) %s",
+					check_item->vp_integer,
+					r == 2 ? "[MPP attempt]" : "");
+				rad_authlog(logstr, request, 1);
+
+				result = -1;
+			}
+		}
+	}
+#endif
+
+	/*
+	 *	Result should be >= 0 here - if not, it means the user
+	 *	is rejected, so we just process post-auth and return.
+	 */
+	if (result < 0) {
+		return RLM_MODULE_REJECT;
+	}
+
+	/*
+	 *	Set the reply to Access-Accept, if it hasn't already
+	 *	been set to something.  (i.e. Access-Challenge)
+	 */
+	if (request->reply->code == 0) {
+		request->reply->code = PW_CODE_ACCESS_ACCEPT;
+	}
+
+	return result;
+}
+
+/*
+ *	Run a virtual server auth and postauth
+ *
+ */
+int rad_virtual_server(REQUEST *request)
+{
+	VALUE_PAIR *vp;
+	int result;
+
+	RDEBUG("Virtual server %s received request", request->server);
+	rdebug_pair_list(L_DBG_LVL_1, request, request->packet->vps, NULL);
+
+	if (!request->username) {
+		request->username = fr_pair_find_by_num(request->packet->vps, PW_USER_NAME, 0, TAG_ANY);
+	}
+
+	/*
+	 *	Complain about possible issues related to tunnels.
+	 */
+	if (request->parent && request->parent->username && request->username) {
+		/*
+		 *	Look at the full User-Name with realm.
+		 */
+		if (request->parent->username->da->attr == PW_STRIPPED_USER_NAME) {
+			vp = fr_pair_find_by_num(request->parent->packet->vps, PW_USER_NAME, 0, TAG_ANY);
+			rad_assert(vp != NULL);
+		} else {
+			vp = request->parent->username;
+		}
+
+		/*
+		 *	If the names aren't identical, we do some detailed checks.
+		 */
+		if (strcmp(vp->vp_strvalue, request->username->vp_strvalue) != 0) {
+			char const *outer, *inner;
+
+			outer = strchr(vp->vp_strvalue, '@');
+
+			/*
+			 *	If there's no realm, or there's a user identifier before
+			 *	the realm name, check the user identifier.
+			 *
+			 *	It SHOULD be "anonymous", or "anonymous@realm"
+			 */
+			if (outer) {
+				if ((outer != vp->vp_strvalue) &&
+				    ((vp->vp_length < 10) || (memcmp(vp->vp_strvalue, "anonymous@", 10) != 0))) {
+					RWDEBUG("Outer User-Name is not anonymized.  User privacy is compromised.");
+				} /* else it is anonymized */
+
+				/*
+				 *	Check when there's no realm, and without the trailing '@'
+				 */
+			} else if ((vp->vp_length < 9) || (memcmp(vp->vp_strvalue, "anonymous", 9) != 0)) {
+					RWDEBUG("Outer User-Name is not anonymized.  User privacy is compromised.");
+
+			} /* else the user identifier is anonymized */
+
+			/*
+			 *	Look for an inner realm, which may or may not exist.
+			 */
+			inner = strchr(request->username->vp_strvalue, '@');
+			if (outer && inner) {
+				outer++;
+				inner++;
+
+				/*
+				 *	The realms are different, do
+				 *	more detailed checks.
+				 */
+				if (strcmp(outer, inner) != 0) {
+					size_t outer_len, inner_len;
+
+					outer_len = vp->vp_length;
+					outer_len -= (outer - vp->vp_strvalue);
+
+					inner_len = request->username->vp_length;
+					inner_len -= (inner - request->username->vp_strvalue);
+
+					/*
+					 *	Inner: secure.example.org
+					 *	Outer: example.org
+					 */
+					if (inner_len > outer_len) {
+						char const *suffix;
+
+						suffix = inner + (inner_len - outer_len) - 1;
+
+						if ((*suffix != '.') ||
+						    (strcmp(suffix + 1, outer) != 0)) {
+							RWDEBUG("Possible spoofing: Inner realm '%s' is not a subdomain of the outer realm '%s'", inner, outer);
+						}
+
+					} else {
+						RWDEBUG("Possible spoofing: Inner realm and outer realms are different");
+					}
+				}
+			}
+
+		} else {
+			RWDEBUG("Outer and inner identities are the same.  User privacy is compromised.");
+		}
+	}
+
+	RDEBUG("server %s {", request->server);
+	RINDENT();
+
+	/*
+	 *	We currently only handle AUTH packets here.
+	 *	This could be expanded to handle other packets as well if required.
+	 */
+	rad_assert(request->packet->code == PW_CODE_ACCESS_REQUEST);
+
+	result = rad_authenticate(request);
+
+	/*
+	 *	Allow bare "accept" and "reject" policies in the inner
+	 *	tunnel.
+	 */
+	if (!request->reply->code &&
+	    (vp = fr_pair_find_by_num(request->config, PW_AUTH_TYPE, 0, TAG_ANY)) != NULL) {
+		switch (vp->vp_integer) {
+		case PW_AUTH_TYPE_ACCEPT:
+			request->reply->code = PW_CODE_ACCESS_ACCEPT;
+			break;
+
+		case PW_AUTH_TYPE_REJECT:
+				request->reply->code = PW_CODE_ACCESS_REJECT;
+				break;
+
+		default:
+			break;
+		}
+	}
+
+	if (request->reply->code == PW_CODE_ACCESS_REJECT) {
+		fr_pair_delete_by_num(&request->config, PW_POST_AUTH_TYPE, 0, TAG_ANY);
+		vp = pair_make_config("Post-Auth-Type", "Reject", T_OP_SET);
+		if (vp) rad_postauth(request);
+	}
+
+	if (request->reply->code == PW_CODE_ACCESS_ACCEPT) {
+		/*
+		 *	Check that there is a name which can be used
+		 *	to identify the user.  The configuration
+		 *	depends on User-Name or Stripped-User-Name
+		 *	existing, and being (mostly) unique to that
+		 *	user.
+		 */
+		if (!request->parent && request->username &&
+		    (request->username->da->attr == PW_USER_NAME) &&
+		    (request->username->vp_strvalue[0] == '@') &&
+		    !fr_pair_find_by_num(request->packet->vps, PW_STRIPPED_USER_NAME, 0, TAG_ANY)) {
+			RWDEBUG("User-Name is anonymized, and no Stripped-User-Name exists.");
+			RWDEBUG("It may be difficult or impossible to identify the user");
+			RWDEBUG("Please update Stripped-User-Name with information which identifies the user");
+		}
+
+		rad_postauth(request);
+	}
+
+	REXDENT();
+	RDEBUG("} # server %s", request->server);
+
+	RDEBUG("Virtual server sending reply");
+	rdebug_pair_list(L_DBG_LVL_1, request, request->reply->vps, NULL);
+
+	return result;
+}