/* * This file contains the softmac's authentication logic. * * Copyright (c) 2005, 2006 Johannes Berg * Joseph Jezak * Larry Finger * Danny van Dyk * Michael Buesch * * This program is free software; you can redistribute it and/or modify it * under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * 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 * * The full GNU General Public License is included in this distribution in the * file called COPYING. */ #include "ieee80211softmac_priv.h" static void ieee80211softmac_auth_queue(void *data); /* Queues an auth request to the desired AP */ int ieee80211softmac_auth_req(struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net) { struct ieee80211softmac_auth_queue_item *auth; unsigned long flags; function_enter(); if (net->authenticating) return 0; /* Add the network if it's not already added */ ieee80211softmac_add_network(mac, net); dprintk(KERN_NOTICE PFX "Queueing Authentication Request to "MAC_FMT"\n", MAC_ARG(net->bssid)); /* Queue the auth request */ auth = (struct ieee80211softmac_auth_queue_item *) kmalloc(sizeof(struct ieee80211softmac_auth_queue_item), GFP_KERNEL); if(auth == NULL) return -ENOMEM; auth->net = net; auth->mac = mac; auth->retry = IEEE80211SOFTMAC_AUTH_RETRY_LIMIT; auth->state = IEEE80211SOFTMAC_AUTH_OPEN_REQUEST; INIT_WORK(&auth->work, &ieee80211softmac_auth_queue, (void *)auth); /* Lock (for list) */ spin_lock_irqsave(&mac->lock, flags); /* add to list */ list_add_tail(&auth->list, &mac->auth_queue); schedule_work(&auth->work); spin_unlock_irqrestore(&mac->lock, flags); return 0; } /* Sends an auth request to the desired AP and handles timeouts */ static void ieee80211softmac_auth_queue(void *data) { struct ieee80211softmac_device *mac; struct ieee80211softmac_auth_queue_item *auth; struct ieee80211softmac_network *net; unsigned long flags; function_enter(); auth = (struct ieee80211softmac_auth_queue_item *)data; net = auth->net; mac = auth->mac; if(auth->retry > 0) { /* Switch to correct channel for this network */ mac->set_channel(mac->dev, net->channel); /* Lock and set flags */ spin_lock_irqsave(&mac->lock, flags); net->authenticated = 0; net->authenticating = 1; /* add a timeout call so we eventually give up waiting for an auth reply */ schedule_delayed_work(&auth->work, IEEE80211SOFTMAC_AUTH_TIMEOUT); auth->retry--; spin_unlock_irqrestore(&mac->lock, flags); if (ieee80211softmac_send_mgt_frame(mac, auth->net, IEEE80211_STYPE_AUTH, auth->state)) dprintk(KERN_NOTICE PFX "Sending Authentication Request to "MAC_FMT" failed (this shouldn't happen, wait for the timeout).\n", MAC_ARG(net->bssid)); else dprintk(KERN_NOTICE PFX "Sent Authentication Request to "MAC_FMT".\n", MAC_ARG(net->bssid)); return; } printkl(KERN_WARNING PFX "Authentication timed out with "MAC_FMT"\n", MAC_ARG(net->bssid)); /* Remove this item from the queue */ spin_lock_irqsave(&mac->lock, flags); ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_AUTH_TIMEOUT, net); cancel_delayed_work(&auth->work); /* just to make sure... */ list_del(&auth->list); spin_unlock_irqrestore(&mac->lock, flags); /* Free it */ kfree(auth); } /* Handle the auth response from the AP * This should be registered with ieee80211 as handle_auth */ int ieee80211softmac_auth_resp(struct net_device *dev, struct ieee80211_auth *auth) { struct list_head *list_ptr; struct ieee80211softmac_device *mac = ieee80211_priv(dev); struct ieee80211softmac_auth_queue_item *aq = NULL; struct ieee80211softmac_network *net = NULL; unsigned long flags; u8 * data; function_enter(); /* Find correct auth queue item */ spin_lock_irqsave(&mac->lock, flags); list_for_each(list_ptr, &mac->auth_queue) { aq = list_entry(list_ptr, struct ieee80211softmac_auth_queue_item, list); net = aq->net; if (!memcmp(net->bssid, auth->header.addr2, ETH_ALEN)) break; else aq = NULL; } spin_unlock_irqrestore(&mac->lock, flags); /* Make sure that we've got an auth queue item for this request */ if(aq == NULL) { printkl(KERN_DEBUG PFX "Authentication response received from "MAC_FMT" but no queue item exists.\n", MAC_ARG(auth->header.addr2)); /* Error #? */ return -1; } /* Check for out of order authentication */ if(!net->authenticating) { printkl(KERN_DEBUG PFX "Authentication response received from "MAC_FMT" but did not request authentication.\n",MAC_ARG(auth->header.addr2)); return -1; } /* Parse the auth packet */ switch(auth->algorithm) { case WLAN_AUTH_OPEN: /* Check the status code of the response */ switch(auth->status) { case WLAN_STATUS_SUCCESS: /* Update the status to Authenticated */ spin_lock_irqsave(&mac->lock, flags); net->authenticating = 0; net->authenticated = 1; spin_unlock_irqrestore(&mac->lock, flags); /* Send event */ printkl(KERN_NOTICE PFX "Open Authentication completed with "MAC_FMT"\n", MAC_ARG(net->bssid)); ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_AUTHENTICATED, net); break; default: /* Lock and reset flags */ spin_lock_irqsave(&mac->lock, flags); net->authenticated = 0; net->authenticating = 0; spin_unlock_irqrestore(&mac->lock, flags); printkl(KERN_NOTICE PFX "Open Authentication with "MAC_FMT" failed, error code: %i\n", MAC_ARG(net->bssid), le16_to_cpup(&auth->status)); /* Count the error? */ break; } goto free_aq; break; case WLAN_AUTH_SHARED_KEY: /* Figure out where we are in the process */ switch(auth->transaction) { case IEEE80211SOFTMAC_AUTH_SHARED_CHALLENGE: /* Check to make sure we have a challenge IE */ data = (u8 *)auth->info_element; if(*data++ != MFIE_TYPE_CHALLENGE){ printkl(KERN_NOTICE PFX "Shared Key Authentication failed due to a missing challenge.\n"); break; } /* Save the challenge */ spin_lock_irqsave(&mac->lock, flags); net->challenge_len = *data++; if(net->challenge_len > WLAN_AUTH_CHALLENGE_LEN) net->challenge_len = WLAN_AUTH_CHALLENGE_LEN; if(net->challenge != NULL) kfree(net->challenge); net->challenge = kmalloc(net->challenge_len, GFP_ATOMIC); memcpy(net->challenge, data, net->challenge_len); aq->state = IEEE80211SOFTMAC_AUTH_SHARED_RESPONSE; spin_unlock_irqrestore(&mac->lock, flags); /* Switch to correct channel for this network */ mac->set_channel(mac->dev, net->channel); /* Send our response (How to encrypt?) */ ieee80211softmac_send_mgt_frame(mac, aq->net, IEEE80211_STYPE_AUTH, aq->state); break; case IEEE80211SOFTMAC_AUTH_SHARED_PASS: /* Check the status code of the response */ switch(auth->status) { case WLAN_STATUS_SUCCESS: /* Update the status to Authenticated */ spin_lock_irqsave(&mac->lock, flags); net->authenticating = 0; net->authenticated = 1; spin_unlock_irqrestore(&mac->lock, flags); printkl(KERN_NOTICE PFX "Shared Key Authentication completed with "MAC_FMT"\n", MAC_ARG(net->bssid)); break; default: printkl(KERN_NOTICE PFX "Shared Key Authentication with "MAC_FMT" failed, error code: %i\n", MAC_ARG(net->bssid), le16_to_cpup(&auth->status)); /* Lock and reset flags */ spin_lock_irqsave(&mac->lock, flags); net->authenticating = 0; net->authenticated = 0; spin_unlock_irqrestore(&mac->lock, flags); /* Count the error? */ break; } goto free_aq; break; default: printkl(KERN_WARNING PFX "Unhandled Authentication Step: %i\n", auth->transaction); break; } goto free_aq; break; default: /* ERROR */ goto free_aq; break; } return 0; free_aq: /* Cancel the timeout */ spin_lock_irqsave(&mac->lock, flags); cancel_delayed_work(&aq->work); /* Remove this item from the queue */ list_del(&aq->list); spin_unlock_irqrestore(&mac->lock, flags); /* Free it */ kfree(aq); return 0; } /* * Handle deauthorization */ static void ieee80211softmac_deauth_from_net(struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net) { struct ieee80211softmac_auth_queue_item *aq = NULL; struct list_head *list_ptr; unsigned long flags; function_enter(); /* Lock and reset status flags */ spin_lock_irqsave(&mac->lock, flags); net->authenticating = 0; net->authenticated = 0; /* Find correct auth queue item, if it exists */ list_for_each(list_ptr, &mac->auth_queue) { aq = list_entry(list_ptr, struct ieee80211softmac_auth_queue_item, list); if (!memcmp(net->bssid, aq->net->bssid, ETH_ALEN)) break; else aq = NULL; } /* Cancel pending work */ if(aq != NULL) /* Not entirely safe? What about running work? */ cancel_delayed_work(&aq->work); /* Free our network ref */ ieee80211softmac_del_network_locked(mac, net); if(net->challenge != NULL) kfree(net->challenge); kfree(net); /* can't transmit data right now... */ netif_carrier_off(mac->dev); /* let's try to re-associate */ schedule_work(&mac->associnfo.work); spin_unlock_irqrestore(&mac->lock, flags); } /* * Sends a deauth request to the desired AP */ int ieee80211softmac_deauth_req(struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net, int reason) { int ret; function_enter(); /* Make sure the network is authenticated */ if (!net->authenticated) { printkl(KERN_DEBUG PFX "Can't send deauthentication packet, network is not authenticated.\n"); /* Error okay? */ return -EPERM; } /* Send the de-auth packet */ if((ret = ieee80211softmac_send_mgt_frame(mac, net, IEEE80211_STYPE_DEAUTH, reason))) return ret; ieee80211softmac_deauth_from_net(mac, net); return 0; } /* * This should be registered with ieee80211 as handle_deauth */ int ieee80211softmac_deauth_resp(struct net_device *dev, struct ieee80211_auth *auth) { struct ieee80211softmac_network *net = NULL; struct ieee80211softmac_device *mac = ieee80211_priv(dev); function_enter(); if (!auth) { dprintk("deauth without deauth packet. eek!\n"); return 0; } net = ieee80211softmac_get_network_by_bssid(mac, auth->header.addr2); if (net == NULL) { printkl(KERN_DEBUG PFX "Received deauthentication packet from "MAC_FMT", but that network is unknown.\n", MAC_ARG(auth->header.addr2)); return 0; } /* Make sure the network is authenticated */ if(!net->authenticated) { printkl(KERN_DEBUG PFX "Can't perform deauthentication, network is not authenticated.\n"); /* Error okay? */ return -EPERM; } ieee80211softmac_deauth_from_net(mac, net); return 0; }