Hi,
In my environment, I am using WPA-EAP to authenticate users, but I want the
VLAN assignment to come from the accept_mac_file rather than the RADIUS
server. I'm happy to get into my reasons for that if you care, but I don't
think it really matters.
The documentation in the hostapd.conf file says that the dynamic_vlan
variable is used to control whether VLAN assignments are accepted from a
RADIUS server. The implication seems to be that a static VLAN assignment
will come from the accept_mac_file if dynamic_vlan is set to 0, and a
dynamic assignment will come from the RADIUS server if dynamic_vlan is set
to 1. Instead, I'm seeing that the static settings from the
accept_mac_file are ignored if dynamic_vlan is set to 0, but used if
dynamic_vlan is set to 1. If dynamic_vlan is set to 1 and the RADIUS
server does not provide a VLAN, then the accept_mac_file assignment is
overridden and the STA is assigned to the default non-VLANed interface.
If my understanding of the expected behavior is correct, then I believe the
problem is in ap_sta_set_vlan(). That routine checks the dynamic_vlan
setting, but has no way of determining whether the incoming vlan_desc is
static (i.e., from accept_mac_file) or dynamic (i.e., from a RADIUS
server).
I've attached a patch that gets hostapd working as I believe it's meant to,
and updates the documentation to make the implicit behavior explicit.
The functional changes are:
- hostapd_allowed_address() will always extract the vlan_id from the
accept_macs file. It will not update the vlan_id from the RADIUS cache
if dynamic_vlan is DISABLED.
- hostapd_acl_recv_radius() will not update the cached vlan_id if
dynamic_vlan is DISABLED.
- ieee802_1x_receive_auth() will not update the vlan_id if dynamic_vlan
is DISABLED.
More cosmetic:
Most of the delta is just moving code out of ieee802_1x_receive_auth() into a
new ieee802_1x_update_vlan() routine. While I initially did this because the
new DISABLED check introduced excessive indentation, it has the added
advantage of eliminating the vlan_description allocation and os_memset() call
for all DYNAMIC_VLAN_DISABLED configs.
I've done a couple rounds of review offline with Michael Braun (who has
done much of the work in this part of the code) and incorporated his
feedback.
Nils
diff --git a/hostapd/hostapd.conf b/hostapd/hostapd.conf
index 73e8fc39f..5401a3831 100644
--- a/hostapd/hostapd.conf
+++ b/hostapd/hostapd.conf
@@ -1104,7 +1104,7 @@ own_ip_addr=127.0.0.1
# Tunnel-Medium-Type (value 6 = IEEE 802), Tunnel-Private-Group-ID (value
# VLANID as a string). Optionally, the local MAC ACL list (accept_mac_file) can
# be used to set static client MAC address to VLAN ID mapping.
-# 0 = disabled (default)
+# 0 = disabled (default); only VLAN IDs from accept_mac_file will be used
# 1 = option; use default interface if RADIUS server does not include VLAN ID
# 2 = required; reject authentication if RADIUS server does not include VLAN ID
#dynamic_vlan=0
diff --git a/src/ap/ieee802_11_auth.c b/src/ap/ieee802_11_auth.c
index 3308398d1..c294c67cc 100644
--- a/src/ap/ieee802_11_auth.c
+++ b/src/ap/ieee802_11_auth.c
@@ -281,6 +281,9 @@ int hostapd_allowed_address(struct hostapd_data
*hapd, const u8 *addr,
#else /* CONFIG_NO_RADIUS */
struct hostapd_acl_query_data *query;
+ if (hapd->conf->ssid.dynamic_vlan == DYNAMIC_VLAN_DISABLED)
+ vlan_id = NULL;
+
/* Check whether ACL cache has an entry for this station */
res = hostapd_acl_cache_get(hapd, addr, session_timeout,
acct_interim_interval, vlan_id, psk,
@@ -566,12 +569,14 @@ hostapd_acl_recv_radius(struct radius_msg *msg,
struct radius_msg *req,
cache->acct_interim_interval = 0;
}
- notempty = &cache->vlan_id.notempty;
- untagged = &cache->vlan_id.untagged;
- tagged = cache->vlan_id.tagged;
- *notempty = !!radius_msg_get_vlanid(msg, untagged,
- MAX_NUM_TAGGED_VLAN,
- tagged);
+ if (hapd->conf->ssid.dynamic_vlan != DYNAMIC_VLAN_DISABLED) {
+ notempty = &cache->vlan_id.notempty;
+ untagged = &cache->vlan_id.untagged;
+ tagged = cache->vlan_id.tagged;
+ *notempty = !!radius_msg_get_vlanid(msg, untagged,
+ MAX_NUM_TAGGED_VLAN,
+ tagged);
+ }
decode_tunnel_passwords(hapd, shared_secret, shared_secret_len,
msg, req, cache);
diff --git a/src/ap/ieee802_1x.c b/src/ap/ieee802_1x.c
index 793d381ed..ffe539a4d 100644
--- a/src/ap/ieee802_1x.c
+++ b/src/ap/ieee802_1x.c
@@ -1673,6 +1673,49 @@ ieee802_1x_search_radius_identifier(struct
hostapd_data *hapd, u8 identifier)
}
+#ifndef CONFIG_NO_VLAN
+static int
+ieee802_1x_update_vlan(struct radius_msg *msg,
+ struct hostapd_data *hapd,
+ struct sta_info *sta)
+{
+ struct vlan_description vlan_desc;
+ int *untagged, *tagged, *notempty;
+
+ os_memset(&vlan_desc, 0, sizeof(vlan_desc));
+ notempty = &vlan_desc.notempty;
+ untagged = &vlan_desc.untagged;
+ tagged = vlan_desc.tagged;
+ *notempty = !!radius_msg_get_vlanid(msg, untagged, MAX_NUM_TAGGED_VLAN,
+ tagged);
+
+ if (vlan_desc.notempty &&
+ !hostapd_vlan_valid(hapd->conf->vlan, &vlan_desc)) {
+ sta->eapol_sm->authFail = TRUE;
+ hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_RADIUS,
+ HOSTAPD_LEVEL_INFO,
+ "Invalid VLAN %d%s received from RADIUS server",
+ vlan_desc.untagged,
+ vlan_desc.tagged[0] ? "+" : "");
+ os_memset(&vlan_desc, 0, sizeof(vlan_desc));
+ ap_sta_set_vlan(hapd, sta, &vlan_desc);
+ return -1;
+ }
+
+ if (hapd->conf->ssid.dynamic_vlan == DYNAMIC_VLAN_REQUIRED &&
+ !vlan_desc.notempty) {
+ sta->eapol_sm->authFail = TRUE;
+ hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE8021X,
+ HOSTAPD_LEVEL_INFO, "authentication server did "
+ "not include required VLAN ID in Access-Accept");
+ return -1;
+ }
+
+ return (ap_sta_set_vlan(hapd, sta, &vlan_desc));
+}
+#endif /* CONFIG_NO_VLAN */
+
+
/**
* ieee802_1x_receive_auth - Process RADIUS frames from Authentication Server
* @msg: RADIUS response message
@@ -1694,12 +1737,6 @@ ieee802_1x_receive_auth(struct radius_msg *msg,
struct radius_msg *req,
struct eapol_state_machine *sm;
int override_eapReq = 0;
struct radius_hdr *hdr = radius_msg_get_hdr(msg);
- struct vlan_description vlan_desc;
-#ifndef CONFIG_NO_VLAN
- int *untagged, *tagged, *notempty;
-#endif /* CONFIG_NO_VLAN */
-
- os_memset(&vlan_desc, 0, sizeof(vlan_desc));
sm = ieee802_1x_search_radius_identifier(hapd, hdr->identifier);
if (sm == NULL) {
@@ -1764,56 +1801,21 @@ ieee802_1x_receive_auth(struct radius_msg
*msg, struct radius_msg *req,
switch (hdr->code) {
case RADIUS_CODE_ACCESS_ACCEPT:
#ifndef CONFIG_NO_VLAN
- if (hapd->conf->ssid.dynamic_vlan != DYNAMIC_VLAN_DISABLED) {
- notempty = &vlan_desc.notempty;
- untagged = &vlan_desc.untagged;
- tagged = vlan_desc.tagged;
- *notempty = !!radius_msg_get_vlanid(msg, untagged,
- MAX_NUM_TAGGED_VLAN,
- tagged);
- }
-
- if (vlan_desc.notempty &&
- !hostapd_vlan_valid(hapd->conf->vlan, &vlan_desc)) {
- sta->eapol_sm->authFail = TRUE;
- hostapd_logger(hapd, sta->addr,
- HOSTAPD_MODULE_RADIUS,
- HOSTAPD_LEVEL_INFO,
- "Invalid VLAN %d%s received from RADIUS server",
- vlan_desc.untagged,
- vlan_desc.tagged[0] ? "+" : "");
- os_memset(&vlan_desc, 0, sizeof(vlan_desc));
- ap_sta_set_vlan(hapd, sta, &vlan_desc);
- break;
- }
-
- if (hapd->conf->ssid.dynamic_vlan == DYNAMIC_VLAN_REQUIRED &&
- !vlan_desc.notempty) {
- sta->eapol_sm->authFail = TRUE;
- hostapd_logger(hapd, sta->addr,
- HOSTAPD_MODULE_IEEE8021X,
- HOSTAPD_LEVEL_INFO, "authentication "
- "server did not include required VLAN "
- "ID in Access-Accept");
- break;
- }
-#endif /* CONFIG_NO_VLAN */
-
- if (ap_sta_set_vlan(hapd, sta, &vlan_desc) < 0)
+ if (hapd->conf->ssid.dynamic_vlan != DYNAMIC_VLAN_DISABLED &&
+ ieee802_1x_update_vlan(msg, hapd, sta) < 0)
break;
-#ifndef CONFIG_NO_VLAN
if (sta->vlan_id > 0) {
hostapd_logger(hapd, sta->addr,
HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_INFO,
"VLAN ID %d", sta->vlan_id);
}
-#endif /* CONFIG_NO_VLAN */
if ((sta->flags & WLAN_STA_ASSOC) &&
ap_sta_bind_vlan(hapd, sta) < 0)
break;
+#endif /* CONFIG_NO_VLAN */
sta->session_timeout_set = !!session_timeout_set;
sta->session_timeout = session_timeout;
diff --git a/src/ap/sta_info.c b/src/ap/sta_info.c
index d4f00d1f9..b9d4b49e4 100644
--- a/src/ap/sta_info.c
+++ b/src/ap/sta_info.c
@@ -888,9 +888,6 @@ int ap_sta_set_vlan(struct hostapd_data *hapd,
struct sta_info *sta,
struct hostapd_vlan *vlan = NULL, *wildcard_vlan = NULL;
int old_vlan_id, vlan_id = 0, ret = 0;
- if (hapd->conf->ssid.dynamic_vlan == DYNAMIC_VLAN_DISABLED)
- vlan_desc = NULL;
-
/* Check if there is something to do */
if (hapd->conf->ssid.per_sta_vif && !sta->vlan_id) {
/* This sta is lacking its own vif */
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