i have a similar situation $ sudo grep Profile dictionary ATTRIBUTE Profile 3000 string $ sudo grep Profile ldap.attrmap replyItem Profile VPN $ more default ..... post-auth { if (Profile == g1) { update reply { class = "ou=g1;" } } But in the log # Executing section post-auth from file /opt/freeradius/etc/raddb/sites-enabled/default +- entering group post-auth {...} ++? if (Profile == g1) (Attribute Profile was not found) ? Evaluating (Profile == g1) -> FALSE ++? if (Profile == g1) -> FALSE I also tried If (reply:Profile == g1) Any idea? Thanks Frank On May 17, 2012, at 3:58 AM, C.F. Yeung wrote: Thanks, it's working. On Thu, May 17, 2012 at 3:22 PM, Phil Mayers <p.mayers@imperial.ac.uk<mailto:p.mayers@imperial.ac.uk>> wrote: On 05/17/2012 06:54 AM, C.F. Yeung wrote: We have 802.1x authentication via AD. It's okay. Now, we would like to reject users based on LDAP attribute, WLANStatus. Added attribute in dictionary and ldap.attrmap as follow. Where should I put the unlang? /etc/raddb/dictionary ATTRIBUTE My-Local-wlanStatus 3000 string /etc/raddb/ldap.attrmap replyItem My-Local-wlanStatus WLANStatus It's a REPLY item, so this should be: if (reply:My-Local-wlanStatus == A1) { ... } - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html

thanks for reply. Here is the output of radiusd -X. It seems that ldap module did not query for the VPN attribute after the successful authentication Copyright (C) 1999-2009 The FreeRADIUS server project and contributors. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. You may redistribute copies of FreeRADIUS under the terms of the GNU General Public License v2. Starting - reading configuration files ... including configuration file /opt/freeradius/etc/raddb/radiusd.conf including configuration file /opt/freeradius/etc/raddb/proxy.conf including configuration file /opt/freeradius/etc/raddb/clients.conf including files in directory /opt/freeradius/etc/raddb/modules/ including configuration file /opt/freeradius/etc/raddb/modules/ippool including configuration file /opt/freeradius/etc/raddb/modules/policy including configuration file /opt/freeradius/etc/raddb/modules/counter including configuration file /opt/freeradius/etc/raddb/modules/passwd including configuration file /opt/freeradius/etc/raddb/modules/inner-eap including configuration file /opt/freeradius/etc/raddb/modules/attr_rewrite including configuration file /opt/freeradius/etc/raddb/modules/dynamic_clients including configuration file /opt/freeradius/etc/raddb/modules/expiration including configuration file /opt/freeradius/etc/raddb/modules/mac2ip including configuration file /opt/freeradius/etc/raddb/modules/digest including configuration file /opt/freeradius/etc/raddb/modules/pam including configuration file /opt/freeradius/etc/raddb/modules/expr including configuration file /opt/freeradius/etc/raddb/modules/realm including configuration file /opt/freeradius/etc/raddb/modules/attr_filter including configuration file /opt/freeradius/etc/raddb/modules/acct_unique including configuration file /opt/freeradius/etc/raddb/modules/detail.log including configuration file /opt/freeradius/etc/raddb/modules/radutmp including configuration file /opt/freeradius/etc/raddb/modules/smsotp including configuration file /opt/freeradius/etc/raddb/modules/sql_log including configuration file /opt/freeradius/etc/raddb/modules/sradutmp including configuration file /opt/freeradius/etc/raddb/modules/otp including configuration file /opt/freeradius/etc/raddb/modules/echo including configuration file /opt/freeradius/etc/raddb/modules/detail including configuration file /opt/freeradius/etc/raddb/modules/unix including configuration file /opt/freeradius/etc/raddb/modules/ntlm_auth including configuration file /opt/freeradius/etc/raddb/modules/detail.example.com including configuration file /opt/freeradius/etc/raddb/modules/preprocess including configuration file /opt/freeradius/etc/raddb/modules/perl including configuration file /opt/freeradius/etc/raddb/modules/opendirectory including configuration file /opt/freeradius/etc/raddb/modules/chap including configuration file /opt/freeradius/etc/raddb/modules/pap including configuration file /opt/freeradius/etc/raddb/modules/smbpasswd including configuration file /opt/freeradius/etc/raddb/modules/logintime including configuration file /opt/freeradius/etc/raddb/modules/ldap including configuration file /opt/freeradius/etc/raddb/modules/exec including configuration file /opt/freeradius/etc/raddb/modules/etc_group including configuration file /opt/freeradius/etc/raddb/modules/mschap including configuration file /opt/freeradius/etc/raddb/modules/sqlcounter_expire_on_login including configuration file /opt/freeradius/etc/raddb/modules/linelog including configuration file /opt/freeradius/etc/raddb/modules/files including configuration file /opt/freeradius/etc/raddb/modules/always including configuration file /opt/freeradius/etc/raddb/modules/krb5 including configuration file /opt/freeradius/etc/raddb/modules/checkval including configuration file /opt/freeradius/etc/raddb/modules/mac2vlan including configuration file /opt/freeradius/etc/raddb/modules/wimax including configuration file /opt/freeradius/etc/raddb/modules/cui including configuration file /opt/freeradius/etc/raddb/eap.conf including configuration file /opt/freeradius/etc/raddb/policy.conf including files in directory /opt/freeradius/etc/raddb/sites-enabled/ including configuration file /opt/freeradius/etc/raddb/sites-enabled/default including configuration file /opt/freeradius/etc/raddb/sites-enabled/inner-tunnel including configuration file /opt/freeradius/etc/raddb/sites-enabled/status including configuration file /opt/freeradius/etc/raddb/sites-enabled/control-socket main { user = "radius" group = "radius" allow_core_dumps = no } including dictionary file /opt/freeradius/etc/raddb/dictionary main { prefix = "/opt/freeradius" localstatedir = "/opt/freeradius/var" logdir = "/var/log" libdir = "/opt/freeradius/lib" radacctdir = "/var/log/radacct" hostname_lookups = no max_request_time = 30 cleanup_delay = 5 max_requests = 1024 pidfile = "/opt/freeradius/var/run/radiusd/radiusd.pid" checkrad = "/opt/freeradius/sbin/checkrad" debug_level = 1 proxy_requests = yes log { stripped_names = no auth = yes auth_badpass = no auth_goodpass = no } security { max_attributes = 200 reject_delay = 1 status_server = yes } } radiusd: #### Loading Realms and Home Servers #### proxy server { retry_delay = 5 retry_count = 3 default_fallback = no dead_time = 120 wake_all_if_all_dead = no } home_server localhost { ipaddr = 127.0.0.1 port = 1812 type = "auth" secret = "testing123" response_window = 20 max_outstanding = 65536 require_message_authenticator = yes zombie_period = 40 status_check = "status-server" ping_interval = 30 check_interval = 30 num_answers_to_alive = 3 num_pings_to_alive = 3 revive_interval = 120 status_check_timeout = 4 irt = 2 mrt = 16 mrc = 5 mrd = 30 } home_server_pool my_auth_failover { type = fail-over home_server = localhost } realm example.com { auth_pool = my_auth_failover } realm LOCAL { } radiusd: #### Loading Clients #### client localhost { ipaddr = 127.0.0.1 require_message_authenticator = no secret = "testing123" nastype = "other" } radiusd: #### Instantiating modules #### instantiate { Module: Linked to module rlm_exec Module: Instantiating module "exec" from file /opt/freeradius/etc/raddb/modules/exec exec { wait = no input_pairs = "request" shell_escape = yes } Module: Linked to module rlm_expr Module: Instantiating module "expr" from file /opt/freeradius/etc/raddb/modules/expr Module: Linked to module rlm_expiration Module: Instantiating module "expiration" from file /opt/freeradius/etc/raddb/modules/expiration expiration { reply-message = "Password Has Expired " } Module: Linked to module rlm_logintime Module: Instantiating module "logintime" from file /opt/freeradius/etc/raddb/modules/logintime logintime { reply-message = "You are calling outside your allowed timespan " minimum-timeout = 60 } } radiusd: #### Loading Virtual Servers #### server inner-tunnel { # from file /opt/freeradius/etc/raddb/sites-enabled/inner-tunnel modules { Module: Checking authenticate {...} for more modules to load Module: Linked to module rlm_pap Module: Instantiating module "pap" from file /opt/freeradius/etc/raddb/modules/pap pap { encryption_scheme = "auto" auto_header = yes } Module: Linked to module rlm_chap Module: Instantiating module "chap" from file /opt/freeradius/etc/raddb/modules/chap Module: Linked to module rlm_mschap Module: Instantiating module "mschap" from file /opt/freeradius/etc/raddb/modules/mschap mschap { use_mppe = yes require_encryption = no require_strong = no with_ntdomain_hack = no } Module: Linked to module rlm_unix Module: Instantiating module "unix" from file /opt/freeradius/etc/raddb/modules/unix unix { radwtmp = "/var/log/radwtmp" } Module: Linked to module rlm_ldap Module: Instantiating module "ldap" from file /opt/freeradius/etc/raddb/modules/ldap ldap { server = "xxxxxxxx" port = 389 password = "xxxxxxxx" identity = "xxxxxxxxxxxxxxx" net_timeout = 1 timeout = 4 timelimit = 3 tls_mode = no start_tls = no tls_require_cert = "allow" tls { start_tls = no require_cert = "allow" } basedn = "xxxxxxxxx" filter = "(uid=%{%{Stripped-User-Name}:-%{User-Name}})" base_filter = "(objectclass=radiusprofile)" password_attribute = "xxxxxxxx" auto_header = yes access_attr = "uid" access_attr_used_for_allow = yes groupname_attribute = "cn" groupmembership_filter = "(|(&(objectClass=GroupOfNames)(member=%{Ldap-UserDn}))(&(objectClass=GroupOfUniqueNames)(uniquemember=%{Ldap-UserDn})))" dictionary_mapping = "/opt/freeradius/etc/raddb/ldap.attrmap" ldap_debug = 0 ldap_connections_number = 5 compare_check_items = no do_xlat = yes set_auth_type = no } rlm_ldap: Registering ldap_groupcmp for Ldap-Group rlm_ldap: Registering ldap_xlat with xlat_name ldap rlm_ldap: reading ldap<->radius mappings from file /opt/freeradius/etc/raddb/ldap.attrmap rlm_ldap: LDAP radiusCheckItem mapped to RADIUS $GENERIC$ rlm_ldap: LDAP radiusReplyItem mapped to RADIUS $GENERIC$ rlm_ldap: LDAP radiusAuthType mapped to RADIUS Auth-Type rlm_ldap: LDAP radiusSimultaneousUse mapped to RADIUS Simultaneous-Use rlm_ldap: LDAP radiusCalledStationId mapped to RADIUS Called-Station-Id rlm_ldap: LDAP radiusCallingStationId mapped to RADIUS Calling-Station-Id rlm_ldap: LDAP lmPassword mapped to RADIUS LM-Password rlm_ldap: LDAP ntPassword mapped to RADIUS NT-Password rlm_ldap: LDAP sambaLmPassword mapped to RADIUS LM-Password rlm_ldap: LDAP sambaNtPassword mapped to RADIUS NT-Password rlm_ldap: LDAP dBCSPwd mapped to RADIUS LM-Password rlm_ldap: LDAP userPassword mapped to RADIUS Password-With-Header rlm_ldap: LDAP acctFlags mapped to RADIUS SMB-Account-CTRL-TEXT rlm_ldap: LDAP radiusExpiration mapped to RADIUS Expiration rlm_ldap: LDAP radiusNASIpAddress mapped to RADIUS NAS-IP-Address rlm_ldap: LDAP xxxxxxxx mapped to RADIUS Cleartext-Password rlm_ldap: LDAP radiusServiceType mapped to RADIUS Service-Type rlm_ldap: LDAP radiusFramedProtocol mapped to RADIUS Framed-Protocol rlm_ldap: LDAP radiusFramedIPAddress mapped to RADIUS Framed-IP-Address rlm_ldap: LDAP radiusFramedIPNetmask mapped to RADIUS Framed-IP-Netmask rlm_ldap: LDAP radiusFramedRoute mapped to RADIUS Framed-Route rlm_ldap: LDAP radiusFramedRouting mapped to RADIUS Framed-Routing rlm_ldap: LDAP radiusFilterId mapped to RADIUS Filter-Id rlm_ldap: LDAP radiusFramedMTU mapped to RADIUS Framed-MTU rlm_ldap: LDAP radiusFramedCompression mapped to RADIUS Framed-Compression rlm_ldap: LDAP radiusLoginIPHost mapped to RADIUS Login-IP-Host rlm_ldap: LDAP radiusLoginService mapped to RADIUS Login-Service rlm_ldap: LDAP radiusLoginTCPPort mapped to RADIUS Login-TCP-Port rlm_ldap: LDAP radiusCallbackNumber mapped to RADIUS Callback-Number rlm_ldap: LDAP radiusCallbackId mapped to RADIUS Callback-Id rlm_ldap: LDAP radiusFramedIPXNetwork mapped to RADIUS Framed-IPX-Network rlm_ldap: LDAP radiusSessionTimeout mapped to RADIUS Session-Timeout rlm_ldap: LDAP radiusIdleTimeout mapped to RADIUS Idle-Timeout rlm_ldap: LDAP radiusTerminationAction mapped to RADIUS Termination-Action rlm_ldap: LDAP radiusLoginLATService mapped to RADIUS Login-LAT-Service rlm_ldap: LDAP radiusLoginLATNode mapped to RADIUS Login-LAT-Node rlm_ldap: LDAP radiusLoginLATGroup mapped to RADIUS Login-LAT-Group rlm_ldap: LDAP radiusFramedAppleTalkLink mapped to RADIUS Framed-AppleTalk-Link rlm_ldap: LDAP radiusFramedAppleTalkNetwork mapped to RADIUS Framed-AppleTalk-Network rlm_ldap: LDAP radiusFramedAppleTalkZone mapped to RADIUS Framed-AppleTalk-Zone rlm_ldap: LDAP radiusPortLimit mapped to RADIUS Port-Limit rlm_ldap: LDAP radiusLoginLATPort mapped to RADIUS Login-LAT-Port rlm_ldap: LDAP radiusReplyMessage mapped to RADIUS Reply-Message rlm_ldap: LDAP radiusTunnelType mapped to RADIUS Tunnel-Type rlm_ldap: LDAP radiusTunnelMediumType mapped to RADIUS Tunnel-Medium-Type rlm_ldap: LDAP radiusTunnelPrivateGroupId mapped to RADIUS Tunnel-Private-Group-Id rlm_ldap: LDAP VPN mapped to RADIUS Profile conns: 0xdb8cbe0 Module: Linked to module rlm_eap Module: Instantiating module "eap" from file /opt/freeradius/etc/raddb/eap.conf eap { default_eap_type = "md5" timer_expire = 60 ignore_unknown_eap_types = no cisco_accounting_username_bug = no max_sessions = 4096 } Module: Linked to sub-module rlm_eap_md5 Module: Instantiating eap-md5 Module: Linked to sub-module rlm_eap_leap Module: Instantiating eap-leap Module: Linked to sub-module rlm_eap_gtc Module: Instantiating eap-gtc gtc { challenge = "Password: " auth_type = "PAP" } Module: Linked to sub-module rlm_eap_tls Module: Instantiating eap-tls tls { rsa_key_exchange = no dh_key_exchange = yes rsa_key_length = 512 dh_key_length = 512 verify_depth = 0 CA_path = "/opt/freeradius/etc/raddb/certs" pem_file_type = yes private_key_file = "/opt/freeradius/etc/raddb/certs/xxxx.pem" certificate_file = "/opt/freeradius/etc/raddb/certs/xxxx.pem" CA_file = "/opt/freeradius/etc/raddb/certs/ca.pem" private_key_password = "xxxxx" dh_file = "/opt/freeradius/etc/raddb/certs/dh" random_file = "/opt/freeradius/etc/raddb/certs/random" fragment_size = 1024 include_length = yes check_crl = no cipher_list = "DEFAULT" make_cert_command = "/opt/freeradius/etc/raddb/certs/bootstrap" cache { enable = no lifetime = 24 max_entries = 255 } verify { } } Module: Linked to sub-module rlm_eap_ttls Module: Instantiating eap-ttls ttls { default_eap_type = "md5" copy_request_to_tunnel = no use_tunneled_reply = no virtual_server = "inner-tunnel" include_length = yes } Module: Linked to sub-module rlm_eap_peap Module: Instantiating eap-peap peap { default_eap_type = "mschapv2" copy_request_to_tunnel = yes use_tunneled_reply = yes proxy_tunneled_request_as_eap = no virtual_server = "inner-tunnel" } Module: Linked to sub-module rlm_eap_mschapv2 Module: Instantiating eap-mschapv2 mschapv2 { with_ntdomain_hack = no } Module: Checking authorize {...} for more modules to load Module: Linked to module rlm_realm Module: Instantiating module "suffix" from file /opt/freeradius/etc/raddb/modules/realm realm suffix { format = "suffix" delimiter = "@" ignore_default = no ignore_null = no } Module: Linked to module rlm_files Module: Instantiating module "files" from file /opt/freeradius/etc/raddb/modules/files files { usersfile = "/opt/freeradius/etc/raddb/users" acctusersfile = "/opt/freeradius/etc/raddb/acct_users" preproxy_usersfile = "/opt/freeradius/etc/raddb/preproxy_users" compat = "no" } Module: Checking session {...} for more modules to load Module: Linked to module rlm_radutmp Module: Instantiating module "radutmp" from file /opt/freeradius/etc/raddb/modules/radutmp radutmp { filename = "/var/log/radutmp" username = "%{User-Name}" case_sensitive = yes check_with_nas = yes perm = 384 callerid = yes } Module: Checking post-proxy {...} for more modules to load Module: Checking post-auth {...} for more modules to load Module: Linked to module rlm_attr_filter Module: Instantiating module "attr_filter.access_reject" from file /opt/freeradius/etc/raddb/modules/attr_filter attr_filter attr_filter.access_reject { attrsfile = "/opt/freeradius/etc/raddb/attrs.access_reject" key = "%{User-Name}" } } # modules } # server server status { # from file /opt/freeradius/etc/raddb/sites-enabled/status modules { Module: Checking authorize {...} for more modules to load Module: Linked to module rlm_always Module: Instantiating module "ok" from file /opt/freeradius/etc/raddb/modules/always always ok { rcode = "ok" simulcount = 0 mpp = no } } # modules } # server server { # from file /opt/freeradius/etc/raddb/radiusd.conf modules { Module: Checking authenticate {...} for more modules to load Module: Linked to module rlm_digest Module: Instantiating module "digest" from file /opt/freeradius/etc/raddb/modules/digest Module: Checking authorize {...} for more modules to load Module: Linked to module rlm_preprocess Module: Instantiating module "preprocess" from file /opt/freeradius/etc/raddb/modules/preprocess preprocess { huntgroups = "/opt/freeradius/etc/raddb/huntgroups" hints = "/opt/freeradius/etc/raddb/hints" with_ascend_hack = no ascend_channels_per_line = 23 with_ntdomain_hack = no with_specialix_jetstream_hack = no with_cisco_vsa_hack = no with_alvarion_vsa_hack = no } Module: Checking preacct {...} for more modules to load Module: Linked to module rlm_acct_unique Module: Instantiating module "acct_unique" from file /opt/freeradius/etc/raddb/modules/acct_unique acct_unique { key = "User-Name, Acct-Session-Id, NAS-IP-Address, Client-IP-Address, NAS-Port" } Module: Checking accounting {...} for more modules to load Module: Linked to module rlm_detail Module: Instantiating module "detail" from file /opt/freeradius/etc/raddb/modules/detail detail { detailfile = "/var/log/radacct/%{Client-IP-Address}/detail-%Y%m%d" header = "%t" detailperm = 384 dirperm = 493 locking = no log_packet_header = no } Module: Instantiating module "attr_filter.accounting_response" from file /opt/freeradius/etc/raddb/modules/attr_filter attr_filter attr_filter.accounting_response { attrsfile = "/opt/freeradius/etc/raddb/attrs.accounting_response" key = "%{User-Name}" } Module: Checking session {...} for more modules to load Module: Checking post-proxy {...} for more modules to load Module: Checking post-auth {...} for more modules to load } # modules } # server radiusd: #### Opening IP addresses and Ports #### listen { type = "auth" ipaddr = * port = 0 } listen { type = "acct" ipaddr = * port = 0 } listen { type = "control" listen { socket = "/opt/freeradius/var/run/radiusd/radiusd.sock" } } listen { type = "status" ipaddr = 127.0.0.1 port = 18120 client admin { ipaddr = 127.0.0.1 require_message_authenticator = no secret = "adminsecret" } } Listening on authentication address * port 1812 Listening on accounting address * port 1813 Listening on command file /opt/freeradius/var/run/radiusd/radiusd.sock Listening on status address 127.0.0.1 port 18120 as server status Listening on proxy address * port 1814 Ready to process requests. Ready to process requests. ^[[A Ready to process requests. rad_recv: Access-Request packet from host 127.0.0.1 port 55859, id=42, length=56 User-Name = "xxxx" User-Password = "xxxxxxx" NAS-IP-Address = xxxxxxx NAS-Port = 1812 # Executing section authorize from file /opt/freeradius/etc/raddb/sites-enabled/default +- entering group authorize {...} ++[preprocess] returns ok ++[chap] returns noop ++[mschap] returns noop ++[digest] returns noop [suffix] No '@' in User-Name = "xxxxx", looking up realm NULL [suffix] No such realm "NULL" ++[suffix] returns noop [eap] No EAP-Message, not doing EAP ++[eap] returns noop ++[files] returns noop [ldap] performing user authorization for xxxxxx [ldap] expand: %{Stripped-User-Name} -> [ldap] ... expanding second conditional [ldap] expand: %{User-Name} -> xxxx [ldap] expand: (uid=%{%{Stripped-User-Name}:-%{User-Name}}) -> (uid=xxxxx) [ldap] expand: ou=people,dc=xxxxxxxxxxxxxxxxxxxx,dc=xxx -> ou=people,dc=xxxx,dc=xxx [ldap] ldap_get_conn: Checking Id: 0 [ldap] ldap_get_conn: Got Id: 0 [ldap] attempting LDAP reconnection [ldap] (re)connect to xxxxxxxxxxx:389, authentication 0 [ldap] bind as xxxxxxxxxxx [ldap] waiting for bind result ... [ldap] Bind was successful [ldap] performing search in xxxxxx, with filter (uid=xxxxxx) [ldap] checking if remote access for xxxx is allowed by uid [ldap] Added NT-Password = xxxxxxxxxxxxx in check items [ldap] looking for check items in directory... [ldap] xxxxxxx -> Cleartext-Password == "{md4}xxxxxxxxxxxxxxxxxxxxx" [ldap] looking for reply items in directory... [ldap] user xxxxxxx authorized to use remote access [ldap] ldap_release_conn: Release Id: 0 ++[ldap] returns ok ++[expiration] returns noop ++[logintime] returns noop [pap] Normalizing NT-Password from hex encoding ++[pap] returns updated Found Auth-Type = PAP # Executing group from file /opt/freeradius/etc/raddb/sites-enabled/default +- entering group PAP {...} [pap] login attempt with password "xxxxxxxxx" [pap] Using NT encryption. [pap] expand: %{User-Password} -> xxxxxxxxx [pap] NT-Hash of xxxxxx) = xxxxxxxxx [pap] expand: %{mschap:NT-Hash %{User-Password}} -> 5xxxxxxx [pap] User authenticated successfully ++[pap] returns ok Login OK: [xxxxx] (from client localhost port 1812) # Executing section post-auth from file /opt/freeradius/etc/raddb/sites-enabled/default +- entering group post-auth {...} ++? if (reply:Profile == vpn) (Attribute reply:Profile was not found) ? Evaluating (reply:Profile == vpn) -> FALSE ++? if (reply:Profile == vpn) -> FALSE ++[exec] returns noop Sending Access-Accept of id 42 to 127.0.0.1 port 55859 Finished request 0. Going to the next request Waking up in 4.9 seconds. Waking up in 2.0 seconds. Cleaning up request 0 ID 42 with timestamp +13 Ready to process requests. On May 17, 2012, at 10:21 AM, Phil Mayers wrote:

On 17/05/12 14:56, Luo, Frank Y.F. Mr. wrote:

...

post-auth { if (Profile == g1) {

This is wrong.

...

I also tried

If (reply:Profile == g1)

This should work.

...

Any idea?

Post a full debug with "radiusd -X". Maybe in a new thread. - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html