View Issue Details

IDProjectCategoryView StatusLast Update
0000479AlmaLinux-9freeradiuspublic2024-11-21 11:25
Reportermatejv Assigned Toelkhan  
PrioritynormalSeveritycrashReproducibilityalways
Status assignedResolutionopen 
Platformx86_64OSAlmaLinuxOS Version9.4
Summary0000479: freeradius crash when status-server enabled and proxy server is unresponsive
Descriptionfreeradius-3.0.21-40.el9_4.x86_64 will crash when configured with a home_server and status_check = status-server and the home server is not responding.

The issue also affects upstream freeradius versions v3.0.27 and v3.2.5. It is fixed in v3.2.6.

The fix is in this commit (https://github.com/FreeRADIUS/freeradius-server/commit/3a9449539e4c5a74c85685cad6abe6edf412f701). It was also applied to v3.0.x branch (https://github.com/FreeRADIUS/freeradius-server/commit/3448cd0dc1c6fb7842cda2bb1223256062b39ff7).

I have applied the patch to Almalinux version of freeradius RPM. It applies cleanly, RPM builds and the crash is fixed.

Almalinux freeradius-3.0.21-39.el9_3.x86_64 is not affected, only release 40 is buggy.

Steps To Reproduceyum -y install freeradius

Add to end of /etc/raddb/proxy.conf:

home_server server1 {
  type = auth
  ipaddr = 192.168.0.1
  port = 1812
  secret = secret1
  status_check = status-server
}

home_server_pool server1_pool {
  home_server = server1
}

realm DEFAULT {
    nostrip
    auth_pool = server1_pool
}


Start server:

radiusd -X

In another terminal try to login:

radtest user@somewhere.com pass1 127.0.0.1 1 testing123

The server will try to proxy requests to server1, will receive no response and send access-reject back to radtest. It will also start sending status-server packets to server1 and crash:

(0) Proxying request to home server 192.168.0.1 port 1812 timeout 30.000000
...
(0) No proxy response, giving up on request and marking it done
Marking home server 192.168.0.1 port 1812 as zombie (it has not responded in 30.000000 seconds).
PING: Waiting 4 seconds for response to ping
(1) Sent Status-Server Id 0 from 0.0.0.0:39123 to 192.168.0.1:1812 length 70
(1) Message-Authenticator := 0x00
(1) NAS-Identifier := "Status Check 0. Are you alive?"
PING: Next status packet in 30 seconds
...
(0) Sent Access-Reject Id 251 from 127.0.0.1:1812 to 127.0.0.1:34426 length 38
(0) Finished request
Waking up in 3.9 seconds.
No response to status check 1 ID 0 for home server 192.168.0.1 port 1812
Segmentation fault (core dumped)

TagsNo tags attached.
Attached Files
freeradius_proxy_status-server_crash.txt (29,679 bytes)   
# radiusd -X
FreeRADIUS Version 3.0.21
Copyright (C) 1999-2019 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
For more information about these matters, see the file named COPYRIGHT
Starting - reading configuration files ...
including dictionary file /usr/share/freeradius/dictionary
including dictionary file /usr/share/freeradius/dictionary.dhcp
including dictionary file /usr/share/freeradius/dictionary.vqp
including dictionary file /etc/raddb/dictionary
including configuration file /etc/raddb/radiusd.conf
including configuration file /etc/raddb/proxy.conf
including configuration file /etc/raddb/clients.conf
including files in directory /etc/raddb/mods-enabled/
including configuration file /etc/raddb/mods-enabled/detail
including configuration file /etc/raddb/mods-enabled/radutmp
including configuration file /etc/raddb/mods-enabled/realm
including configuration file /etc/raddb/mods-enabled/replicate
including configuration file /etc/raddb/mods-enabled/echo
including configuration file /etc/raddb/mods-enabled/linelog
including configuration file /etc/raddb/mods-enabled/chap
including configuration file /etc/raddb/mods-enabled/exec
including configuration file /etc/raddb/mods-enabled/soh
including configuration file /etc/raddb/mods-enabled/pap
including configuration file /etc/raddb/mods-enabled/cache_eap
including configuration file /etc/raddb/mods-enabled/date
including configuration file /etc/raddb/mods-enabled/digest
including configuration file /etc/raddb/mods-enabled/mschap
including configuration file /etc/raddb/mods-enabled/sradutmp
including configuration file /etc/raddb/mods-enabled/preprocess
including configuration file /etc/raddb/mods-enabled/passwd
including configuration file /etc/raddb/mods-enabled/attr_filter
including configuration file /etc/raddb/mods-enabled/ntlm_auth
including configuration file /etc/raddb/mods-enabled/detail.log
including configuration file /etc/raddb/mods-enabled/unix
including configuration file /etc/raddb/mods-enabled/expiration
including configuration file /etc/raddb/mods-enabled/unpack
including configuration file /etc/raddb/mods-enabled/always
including configuration file /etc/raddb/mods-enabled/files
including configuration file /etc/raddb/mods-enabled/expr
including configuration file /etc/raddb/mods-enabled/dynamic_clients
including configuration file /etc/raddb/mods-enabled/utf8
including configuration file /etc/raddb/mods-enabled/logintime
including configuration file /etc/raddb/mods-enabled/eap
including files in directory /etc/raddb/policy.d/
including configuration file /etc/raddb/policy.d/dhcp
including configuration file /etc/raddb/policy.d/filter
including configuration file /etc/raddb/policy.d/control
including configuration file /etc/raddb/policy.d/rfc7542
including configuration file /etc/raddb/policy.d/cui
including configuration file /etc/raddb/policy.d/accounting
including configuration file /etc/raddb/policy.d/debug
including configuration file /etc/raddb/policy.d/operator-name
including configuration file /etc/raddb/policy.d/canonicalization
including configuration file /etc/raddb/policy.d/eap
including files in directory /etc/raddb/sites-enabled/
including configuration file /etc/raddb/sites-enabled/inner-tunnel
including configuration file /etc/raddb/sites-enabled/default
main {
 security {
 	user = "radiusd"
 	group = "radiusd"
 	allow_core_dumps = no
 }
	name = "radiusd"
	prefix = "/usr"
	localstatedir = "/var"
	logdir = "/var/log/radius"
	run_dir = "/var/run/radiusd"
}
main {
	name = "radiusd"
	prefix = "/usr"
	localstatedir = "/var"
	sbindir = "/usr/sbin"
	logdir = "/var/log/radius"
	run_dir = "/var/run/radiusd"
	libdir = "/usr/lib64/freeradius"
	radacctdir = "/var/log/radius/radacct"
	hostname_lookups = no
	max_request_time = 30
	cleanup_delay = 5
	max_requests = 16384
	postauth_client_lost = no
	pidfile = "/var/run/radiusd/radiusd.pid"
	checkrad = "/usr/sbin/checkrad"
	debug_level = 0
	proxy_requests = yes
 log {
 	stripped_names = no
 	auth = no
 	auth_badpass = no
 	auth_goodpass = no
 	colourise = yes
 	msg_denied = "You are already logged in - access denied"
 }
 resources {
 }
 security {
 	max_attributes = 200
 	reject_delay = 1.000000
 	status_server = yes
 	require_message_authenticator = "auto"
 	limit_proxy_state = "auto"
 }
}
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 {
 	nonblock = no
 	ipaddr = 127.0.0.1
 	port = 1812
 	type = "auth"
 	secret = <<< secret >>>
 	response_window = 20.000000
 	response_timeouts = 1
 	max_outstanding = 65536
 	zombie_period = 40
 	status_check = "status-server"
 	ping_interval = 30
 	check_interval = 30
 	check_timeout = 4
 	num_answers_to_alive = 3
 	revive_interval = 120
  limit {
  	max_connections = 16
  	max_requests = 0
  	lifetime = 0
  	idle_timeout = 0
  }
  coa {
  	irt = 2
  	mrt = 16
  	mrc = 5
  	mrd = 30
  }
 }
 home_server server1 {
 	nonblock = no
 	ipaddr = 192.168.0.1
 	port = 1812
 	type = "auth"
 	secret = <<< secret >>>
 	response_window = 30.000000
 	response_timeouts = 1
 	max_outstanding = 65536
 	zombie_period = 40
 	status_check = "status-server"
 	ping_interval = 30
 	check_timeout = 4
 	num_answers_to_alive = 3
 	revive_interval = 300
  limit {
  	max_connections = 16
  	max_requests = 0
  	lifetime = 0
  	idle_timeout = 0
  }
  coa {
  	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 {
 }
 home_server_pool server1_pool {
	home_server = server1
 }
 realm DEFAULT {
	auth_pool = server1_pool
	nostrip
 }
radiusd: #### Loading Clients ####
 client localhost {
 	ipaddr = 127.0.0.1
 	secret = <<< secret >>>
 	nas_type = "other"
 	proto = "*"
  limit {
  	max_connections = 16
  	lifetime = 0
  	idle_timeout = 30
  }
 }
 client localhost_ipv6 {
 	ipv6addr = ::1
 	secret = <<< secret >>>
  limit {
  	max_connections = 16
  	lifetime = 0
  	idle_timeout = 30
  }
 }
Found debugger attached
 # Creating Auth-Type = mschap
 # Creating Auth-Type = eap
 # Creating Auth-Type = PAP
 # Creating Auth-Type = CHAP
 # Creating Auth-Type = MS-CHAP
 # Creating Auth-Type = digest
radiusd: #### Instantiating modules ####
 modules {
  # Loaded module rlm_detail
  # Loading module "detail" from file /etc/raddb/mods-enabled/detail
  detail {
  	filename = "/var/log/radius/radacct/%{%{Packet-Src-IP-Address}:-%{Packet-Src-IPv6-Address}}/detail-%Y%m%d"
  	header = "%t"
  	permissions = 384
  	locking = no
  	escape_filenames = no
  	log_packet_header = no
  }
  # Loaded module rlm_radutmp
  # Loading module "radutmp" from file /etc/raddb/mods-enabled/radutmp
  radutmp {
  	filename = "/var/log/radius/radutmp"
  	username = "%{User-Name}"
  	case_sensitive = yes
  	check_with_nas = yes
  	permissions = 384
  	caller_id = yes
  }
  # Loaded module rlm_realm
  # Loading module "IPASS" from file /etc/raddb/mods-enabled/realm
  realm IPASS {
  	format = "prefix"
  	delimiter = "/"
  	ignore_default = no
  	ignore_null = no
  }
  # Loading module "suffix" from file /etc/raddb/mods-enabled/realm
  realm suffix {
  	format = "suffix"
  	delimiter = "@"
  	ignore_default = no
  	ignore_null = no
  }
  # Loading module "bangpath" from file /etc/raddb/mods-enabled/realm
  realm bangpath {
  	format = "prefix"
  	delimiter = "!"
  	ignore_default = no
  	ignore_null = no
  }
  # Loading module "realmpercent" from file /etc/raddb/mods-enabled/realm
  realm realmpercent {
  	format = "suffix"
  	delimiter = "%"
  	ignore_default = no
  	ignore_null = no
  }
  # Loading module "ntdomain" from file /etc/raddb/mods-enabled/realm
  realm ntdomain {
  	format = "prefix"
  	delimiter = "\\"
  	ignore_default = no
  	ignore_null = no
  }
  # Loaded module rlm_replicate
  # Loading module "replicate" from file /etc/raddb/mods-enabled/replicate
  # Loaded module rlm_exec
  # Loading module "echo" from file /etc/raddb/mods-enabled/echo
  exec echo {
  	wait = yes
  	program = "/bin/echo %{User-Name}"
  	input_pairs = "request"
  	output_pairs = "reply"
  	shell_escape = yes
  }
  # Loaded module rlm_linelog
  # Loading module "linelog" from file /etc/raddb/mods-enabled/linelog
  linelog {
  	filename = "/var/log/radius/linelog"
  	escape_filenames = no
  	syslog_severity = "info"
  	permissions = 384
  	format = "This is a log message for %{User-Name}"
  	reference = "messages.%{%{reply:Packet-Type}:-default}"
  }
  # Loading module "log_accounting" from file /etc/raddb/mods-enabled/linelog
  linelog log_accounting {
  	filename = "/var/log/radius/linelog-accounting"
  	escape_filenames = no
  	syslog_severity = "info"
  	permissions = 384
  	format = ""
  	reference = "Accounting-Request.%{%{Acct-Status-Type}:-unknown}"
  }
  # Loaded module rlm_chap
  # Loading module "chap" from file /etc/raddb/mods-enabled/chap
  # Loading module "exec" from file /etc/raddb/mods-enabled/exec
  exec {
  	wait = no
  	input_pairs = "request"
  	shell_escape = yes
  	timeout = 10
  }
  # Loaded module rlm_soh
  # Loading module "soh" from file /etc/raddb/mods-enabled/soh
  soh {
  	dhcp = yes
  }
  # Loaded module rlm_pap
  # Loading module "pap" from file /etc/raddb/mods-enabled/pap
  pap {
  	normalise = yes
  }
  # Loaded module rlm_cache
  # Loading module "cache_eap" from file /etc/raddb/mods-enabled/cache_eap
  cache cache_eap {
  	driver = "rlm_cache_rbtree"
  	key = "%{%{control:State}:-%{%{reply:State}:-%{State}}}"
  	ttl = 15
  	max_entries = 0
  	epoch = 0
  	add_stats = no
  }
  # Loaded module rlm_date
  # Loading module "date" from file /etc/raddb/mods-enabled/date
  date {
  	format = "%b %e %Y %H:%M:%S %Z"
  	utc = no
  }
  # Loading module "wispr2date" from file /etc/raddb/mods-enabled/date
  date wispr2date {
  	format = "%Y-%m-%dT%H:%M:%S"
  	utc = no
  }
  # Loaded module rlm_digest
  # Loading module "digest" from file /etc/raddb/mods-enabled/digest
  # Loaded module rlm_mschap
  # Loading module "mschap" from file /etc/raddb/mods-enabled/mschap
  mschap {
  	use_mppe = yes
  	require_encryption = no
  	require_strong = no
  	with_ntdomain_hack = yes
   passchange {
   }
  	allow_retry = yes
  	winbind_retry_with_normalised_username = no
  }
  # Loading module "sradutmp" from file /etc/raddb/mods-enabled/sradutmp
  radutmp sradutmp {
  	filename = "/var/log/radius/sradutmp"
  	username = "%{User-Name}"
  	case_sensitive = yes
  	check_with_nas = yes
  	permissions = 420
  	caller_id = no
  }
  # Loaded module rlm_preprocess
  # Loading module "preprocess" from file /etc/raddb/mods-enabled/preprocess
  preprocess {
  	huntgroups = "/etc/raddb/mods-config/preprocess/huntgroups"
  	hints = "/etc/raddb/mods-config/preprocess/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
  }
  # Loaded module rlm_passwd
  # Loading module "etc_passwd" from file /etc/raddb/mods-enabled/passwd
  passwd etc_passwd {
  	filename = "/etc/passwd"
  	format = "*User-Name:Crypt-Password:"
  	delimiter = ":"
  	ignore_nislike = no
  	ignore_empty = yes
  	allow_multiple_keys = no
  	hash_size = 100
  }
  # Loaded module rlm_attr_filter
  # Loading module "attr_filter.post-proxy" from file /etc/raddb/mods-enabled/attr_filter
  attr_filter attr_filter.post-proxy {
  	filename = "/etc/raddb/mods-config/attr_filter/post-proxy"
  	key = "%{Realm}"
  	relaxed = no
  }
  # Loading module "attr_filter.pre-proxy" from file /etc/raddb/mods-enabled/attr_filter
  attr_filter attr_filter.pre-proxy {
  	filename = "/etc/raddb/mods-config/attr_filter/pre-proxy"
  	key = "%{Realm}"
  	relaxed = no
  }
  # Loading module "attr_filter.access_reject" from file /etc/raddb/mods-enabled/attr_filter
  attr_filter attr_filter.access_reject {
  	filename = "/etc/raddb/mods-config/attr_filter/access_reject"
  	key = "%{User-Name}"
  	relaxed = no
  }
  # Loading module "attr_filter.access_challenge" from file /etc/raddb/mods-enabled/attr_filter
  attr_filter attr_filter.access_challenge {
  	filename = "/etc/raddb/mods-config/attr_filter/access_challenge"
  	key = "%{User-Name}"
  	relaxed = no
  }
  # Loading module "attr_filter.accounting_response" from file /etc/raddb/mods-enabled/attr_filter
  attr_filter attr_filter.accounting_response {
  	filename = "/etc/raddb/mods-config/attr_filter/accounting_response"
  	key = "%{User-Name}"
  	relaxed = no
  }
  # Loading module "ntlm_auth" from file /etc/raddb/mods-enabled/ntlm_auth
  exec ntlm_auth {
  	wait = yes
  	program = "/path/to/ntlm_auth --request-nt-key --domain=MYDOMAIN --username=%{mschap:User-Name} --password=%{User-Password}"
  	shell_escape = yes
  }
  # Loading module "auth_log" from file /etc/raddb/mods-enabled/detail.log
  detail auth_log {
  	filename = "/var/log/radius/radacct/%{%{Packet-Src-IP-Address}:-%{Packet-Src-IPv6-Address}}/auth-detail-%Y%m%d"
  	header = "%t"
  	permissions = 384
  	locking = no
  	escape_filenames = no
  	log_packet_header = no
  }
  # Loading module "reply_log" from file /etc/raddb/mods-enabled/detail.log
  detail reply_log {
  	filename = "/var/log/radius/radacct/%{%{Packet-Src-IP-Address}:-%{Packet-Src-IPv6-Address}}/reply-detail-%Y%m%d"
  	header = "%t"
  	permissions = 384
  	locking = no
  	escape_filenames = no
  	log_packet_header = no
  }
  # Loading module "pre_proxy_log" from file /etc/raddb/mods-enabled/detail.log
  detail pre_proxy_log {
  	filename = "/var/log/radius/radacct/%{%{Packet-Src-IP-Address}:-%{Packet-Src-IPv6-Address}}/pre-proxy-detail-%Y%m%d"
  	header = "%t"
  	permissions = 384
  	locking = no
  	escape_filenames = no
  	log_packet_header = no
  }
  # Loading module "post_proxy_log" from file /etc/raddb/mods-enabled/detail.log
  detail post_proxy_log {
  	filename = "/var/log/radius/radacct/%{%{Packet-Src-IP-Address}:-%{Packet-Src-IPv6-Address}}/post-proxy-detail-%Y%m%d"
  	header = "%t"
  	permissions = 384
  	locking = no
  	escape_filenames = no
  	log_packet_header = no
  }
  # Loaded module rlm_unix
  # Loading module "unix" from file /etc/raddb/mods-enabled/unix
  unix {
  	radwtmp = "/var/log/radius/radwtmp"
  }
Creating attribute Unix-Group
  # Loaded module rlm_expiration
  # Loading module "expiration" from file /etc/raddb/mods-enabled/expiration
  # Loaded module rlm_unpack
  # Loading module "unpack" from file /etc/raddb/mods-enabled/unpack
  # Loaded module rlm_always
  # Loading module "reject" from file /etc/raddb/mods-enabled/always
  always reject {
  	rcode = "reject"
  	simulcount = 0
  	mpp = no
  }
  # Loading module "fail" from file /etc/raddb/mods-enabled/always
  always fail {
  	rcode = "fail"
  	simulcount = 0
  	mpp = no
  }
  # Loading module "ok" from file /etc/raddb/mods-enabled/always
  always ok {
  	rcode = "ok"
  	simulcount = 0
  	mpp = no
  }
  # Loading module "handled" from file /etc/raddb/mods-enabled/always
  always handled {
  	rcode = "handled"
  	simulcount = 0
  	mpp = no
  }
  # Loading module "invalid" from file /etc/raddb/mods-enabled/always
  always invalid {
  	rcode = "invalid"
  	simulcount = 0
  	mpp = no
  }
  # Loading module "userlock" from file /etc/raddb/mods-enabled/always
  always userlock {
  	rcode = "userlock"
  	simulcount = 0
  	mpp = no
  }
  # Loading module "notfound" from file /etc/raddb/mods-enabled/always
  always notfound {
  	rcode = "notfound"
  	simulcount = 0
  	mpp = no
  }
  # Loading module "noop" from file /etc/raddb/mods-enabled/always
  always noop {
  	rcode = "noop"
  	simulcount = 0
  	mpp = no
  }
  # Loading module "updated" from file /etc/raddb/mods-enabled/always
  always updated {
  	rcode = "updated"
  	simulcount = 0
  	mpp = no
  }
  # Loaded module rlm_files
  # Loading module "files" from file /etc/raddb/mods-enabled/files
  files {
  	filename = "/etc/raddb/mods-config/files/authorize"
  	acctusersfile = "/etc/raddb/mods-config/files/accounting"
  	preproxy_usersfile = "/etc/raddb/mods-config/files/pre-proxy"
  }
  # Loaded module rlm_expr
  # Loading module "expr" from file /etc/raddb/mods-enabled/expr
  expr {
  	safe_characters = "@abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.-_: /äéöüàâæçèéêëîïôœùûüaÿÄÉÖÜßÀÂÆÇÈÉÊËÎÏÔŒÙÛÜŸ"
  }
  # Loaded module rlm_dynamic_clients
  # Loading module "dynamic_clients" from file /etc/raddb/mods-enabled/dynamic_clients
  # Loaded module rlm_utf8
  # Loading module "utf8" from file /etc/raddb/mods-enabled/utf8
  # Loaded module rlm_logintime
  # Loading module "logintime" from file /etc/raddb/mods-enabled/logintime
  logintime {
  	minimum_timeout = 60
  }
  # Loaded module rlm_eap
  # Loading module "eap" from file /etc/raddb/mods-enabled/eap
  eap {
  	default_eap_type = "md5"
  	timer_expire = 60
  	ignore_unknown_eap_types = no
  	cisco_accounting_username_bug = no
  	max_sessions = 16384
  }
  instantiate {
  }
  # Instantiating module "detail" from file /etc/raddb/mods-enabled/detail
  # Instantiating module "IPASS" from file /etc/raddb/mods-enabled/realm
  # Instantiating module "suffix" from file /etc/raddb/mods-enabled/realm
  # Instantiating module "bangpath" from file /etc/raddb/mods-enabled/realm
  # Instantiating module "realmpercent" from file /etc/raddb/mods-enabled/realm
  # Instantiating module "ntdomain" from file /etc/raddb/mods-enabled/realm
  # Instantiating module "linelog" from file /etc/raddb/mods-enabled/linelog
  # Instantiating module "log_accounting" from file /etc/raddb/mods-enabled/linelog
  # Instantiating module "pap" from file /etc/raddb/mods-enabled/pap
  # Instantiating module "cache_eap" from file /etc/raddb/mods-enabled/cache_eap
rlm_cache (cache_eap): Driver rlm_cache_rbtree (module rlm_cache_rbtree) loaded and linked
  # Instantiating module "mschap" from file /etc/raddb/mods-enabled/mschap
rlm_mschap (mschap): using internal authentication
  # Instantiating module "preprocess" from file /etc/raddb/mods-enabled/preprocess
reading pairlist file /etc/raddb/mods-config/preprocess/huntgroups
reading pairlist file /etc/raddb/mods-config/preprocess/hints
  # Instantiating module "etc_passwd" from file /etc/raddb/mods-enabled/passwd
rlm_passwd: nfields: 3 keyfield 0(User-Name) listable: no
  # Instantiating module "attr_filter.post-proxy" from file /etc/raddb/mods-enabled/attr_filter
reading pairlist file /etc/raddb/mods-config/attr_filter/post-proxy
  # Instantiating module "attr_filter.pre-proxy" from file /etc/raddb/mods-enabled/attr_filter
reading pairlist file /etc/raddb/mods-config/attr_filter/pre-proxy
  # Instantiating module "attr_filter.access_reject" from file /etc/raddb/mods-enabled/attr_filter
reading pairlist file /etc/raddb/mods-config/attr_filter/access_reject
  # Instantiating module "attr_filter.access_challenge" from file /etc/raddb/mods-enabled/attr_filter
reading pairlist file /etc/raddb/mods-config/attr_filter/access_challenge
  # Instantiating module "attr_filter.accounting_response" from file /etc/raddb/mods-enabled/attr_filter
reading pairlist file /etc/raddb/mods-config/attr_filter/accounting_response
  # Instantiating module "auth_log" from file /etc/raddb/mods-enabled/detail.log
rlm_detail (auth_log): 'User-Password' suppressed, will not appear in detail output
  # Instantiating module "reply_log" from file /etc/raddb/mods-enabled/detail.log
  # Instantiating module "pre_proxy_log" from file /etc/raddb/mods-enabled/detail.log
  # Instantiating module "post_proxy_log" from file /etc/raddb/mods-enabled/detail.log
  # Instantiating module "expiration" from file /etc/raddb/mods-enabled/expiration
  # Instantiating module "reject" from file /etc/raddb/mods-enabled/always
  # Instantiating module "fail" from file /etc/raddb/mods-enabled/always
  # Instantiating module "ok" from file /etc/raddb/mods-enabled/always
  # Instantiating module "handled" from file /etc/raddb/mods-enabled/always
  # Instantiating module "invalid" from file /etc/raddb/mods-enabled/always
  # Instantiating module "userlock" from file /etc/raddb/mods-enabled/always
  # Instantiating module "notfound" from file /etc/raddb/mods-enabled/always
  # Instantiating module "noop" from file /etc/raddb/mods-enabled/always
  # Instantiating module "updated" from file /etc/raddb/mods-enabled/always
  # Instantiating module "files" from file /etc/raddb/mods-enabled/files
reading pairlist file /etc/raddb/mods-config/files/authorize
reading pairlist file /etc/raddb/mods-config/files/accounting
reading pairlist file /etc/raddb/mods-config/files/pre-proxy
  # Instantiating module "logintime" from file /etc/raddb/mods-enabled/logintime
  # Instantiating module "eap" from file /etc/raddb/mods-enabled/eap
   # Linked to sub-module rlm_eap_md5
   # Linked to sub-module rlm_eap_leap
   # Linked to sub-module rlm_eap_gtc
   gtc {
   	challenge = "Password: "
   	auth_type = "PAP"
   }
   # Linked to sub-module rlm_eap_tls
   tls {
   	tls = "tls-common"
   }
   tls-config tls-common {
   	verify_depth = 0
   	ca_path = "/etc/raddb/certs"
   	pem_file_type = yes
   	private_key_file = "/etc/raddb/certs/server.pem"
   	certificate_file = "/etc/raddb/certs/server.pem"
   	ca_file = "/etc/raddb/certs/ca.pem"
   	private_key_password = <<< secret >>>
   	fragment_size = 1024
   	include_length = yes
   	auto_chain = yes
   	check_crl = no
   	check_all_crl = no
   	ca_path_reload_interval = 0
   	cipher_list = "PROFILE=SYSTEM"
   	cipher_server_preference = no
   	reject_unknown_intermediate_ca = no
   	ecdh_curve = "prime256v1"
   	tls_max_version = "1.2"
   	tls_min_version = "1.2"
    cache {
    	enable = no
    	lifetime = 24
    	max_entries = 255
    }
    verify {
    	skip_if_ocsp_ok = no
    }
    ocsp {
    	enable = no
    	override_cert_url = yes
    	url = "http://127.0.0.1/ocsp/"
    	use_nonce = yes
    	timeout = 0
    	softfail = no
    }
   }
   # Linked to sub-module rlm_eap_ttls
   ttls {
   	tls = "tls-common"
   	default_eap_type = "md5"
   	copy_request_to_tunnel = no
   	use_tunneled_reply = no
   	virtual_server = "inner-tunnel"
   	include_length = yes
   	require_client_cert = no
   }
tls: Using cached TLS configuration from previous invocation
   # Linked to sub-module rlm_eap_peap
   peap {
   	tls = "tls-common"
   	default_eap_type = "mschapv2"
   	copy_request_to_tunnel = no
   	use_tunneled_reply = no
   	proxy_tunneled_request_as_eap = yes
   	virtual_server = "inner-tunnel"
   	soh = no
   	require_client_cert = no
   }
tls: Using cached TLS configuration from previous invocation
   # Linked to sub-module rlm_eap_mschapv2
   mschapv2 {
   	with_ntdomain_hack = no
   	send_error = no
   }
 } # modules
radiusd: #### Loading Virtual Servers ####
server { # from file /etc/raddb/radiusd.conf
} # server
server inner-tunnel { # from file /etc/raddb/sites-enabled/inner-tunnel
 # Loading authenticate {...}
 # Loading authorize {...}
Ignoring "sql" (see raddb/mods-available/README.rst)
Ignoring "ldap" (see raddb/mods-available/README.rst)
 # Loading session {...}
 # Loading post-proxy {...}
 # Loading post-auth {...}
 # Skipping contents of 'if' as it is always 'false' -- /etc/raddb/sites-enabled/inner-tunnel:336
} # server inner-tunnel
server default { # from file /etc/raddb/sites-enabled/default
 # Loading authenticate {...}
 # Loading authorize {...}
 # Loading preacct {...}
 # Loading accounting {...}
 # Loading post-proxy {...}
 # Loading post-auth {...}
} # server default
radiusd: #### Opening IP addresses and Ports ####
listen {
  	type = "auth"
  	ipaddr = 127.0.0.1
  	port = 18120
}
listen {
  	type = "auth"
  	ipaddr = *
  	port = 0
   limit {
   	max_connections = 16
   	lifetime = 0
   	idle_timeout = 30
   }
}
listen {
  	type = "acct"
  	ipaddr = *
  	port = 0
   limit {
   	max_connections = 16
   	lifetime = 0
   	idle_timeout = 30
   }
}
listen {
  	type = "auth"
  	ipv6addr = ::
  	port = 0
   limit {
   	max_connections = 16
   	lifetime = 0
   	idle_timeout = 30
   }
}
listen {
  	type = "acct"
  	ipv6addr = ::
  	port = 0
   limit {
   	max_connections = 16
   	lifetime = 0
   	idle_timeout = 30
   }
}
Listening on auth address 127.0.0.1 port 18120 bound to server inner-tunnel
Listening on auth address * port 1812 bound to server default
Listening on acct address * port 1813 bound to server default
Listening on auth address :: port 1812 bound to server default
Listening on acct address :: port 1813 bound to server default
Listening on proxy address * port 39123
Listening on proxy address :: port 38877
Ready to process requests
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
BlastRADIUS check: Received packet with Message-Authenticator.
Setting "require_message_authenticator = true" for client localhost
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
It looks like the client has been updated to protect from the BlastRADIUS attack.
Please set "require_message_authenticator = true" for client localhost
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
(0) Received Access-Request Id 251 from 127.0.0.1:34426 to 127.0.0.1:1812 length 88
(0)   Message-Authenticator = 0xea4fa63cfde90e3e94aa4e69d9252088
(0)   User-Name = "user@somewhere.com"
(0)   User-Password = "pass1"
(0)   NAS-IP-Address = 172.17.0.2
(0)   NAS-Port = 1
(0) # Executing section authorize from file /etc/raddb/sites-enabled/default
(0)   authorize {
(0)     policy filter_username {
(0)       if (&User-Name) {
(0)       if (&User-Name)  -> TRUE
(0)       if (&User-Name)  {
(0)         if (&User-Name =~ / /) {
(0)         if (&User-Name =~ / /)  -> FALSE
(0)         if (&User-Name =~ /@[^@]*@/ ) {
(0)         if (&User-Name =~ /@[^@]*@/ )  -> FALSE
(0)         if (&User-Name =~ /\.\./ ) {
(0)         if (&User-Name =~ /\.\./ )  -> FALSE
(0)         if ((&User-Name =~ /@/) && (&User-Name !~ /@(.+)\.(.+)$/))  {
(0)         if ((&User-Name =~ /@/) && (&User-Name !~ /@(.+)\.(.+)$/))   -> FALSE
(0)         if (&User-Name =~ /\.$/)  {
(0)         if (&User-Name =~ /\.$/)   -> FALSE
(0)         if (&User-Name =~ /@\./)  {
(0)         if (&User-Name =~ /@\./)   -> FALSE
(0)       } # if (&User-Name)  = notfound
(0)     } # policy filter_username = notfound
(0)     [preprocess] = ok
(0)     [chap] = noop
(0)     [mschap] = noop
(0)     [digest] = noop
(0) suffix: Checking for suffix after "@"
(0) suffix: Looking up realm "somewhere.com" for User-Name = "user@somewhere.com"
(0) suffix: Found realm "DEFAULT"
(0) suffix: Adding Realm = "DEFAULT"
(0) suffix: Proxying request from user user@somewhere.com to realm DEFAULT
(0) suffix: Preparing to proxy authentication request to realm "DEFAULT" 
(0)     [suffix] = updated
(0) eap: No EAP-Message, not doing EAP
(0)     [eap] = noop
(0)     [files] = noop
(0)     [expiration] = noop
(0)     [logintime] = noop
(0)     [pap] = noop
(0)   } # authorize = updated
(0) Starting proxy to home server 192.168.0.1 port 1812
(0) server default {
(0) }
(0) Proxying request to home server 192.168.0.1 port 1812 timeout 30.000000
(0) Sent Access-Request Id 138 from 0.0.0.0:39123 to 192.168.0.1:1812 length 99
(0)   Message-Authenticator = 0xea4fa63cfde90e3e94aa4e69d9252088
(0)   User-Name = "user@somewhere.com"
(0)   User-Password = "pass1"
(0)   NAS-IP-Address = 172.17.0.2
(0)   NAS-Port = 1
(0)   Event-Timestamp = "Sep  6 2024 13:24:58 CEST"
(0)   Proxy-State = 0x323531
Waking up in 0.3 seconds.
(0) Expecting proxy response no later than 29.666405 seconds from now
Waking up in 29.6 seconds.
(0) No proxy response, giving up on request and marking it done
Marking home server 192.168.0.1 port 1812 as zombie (it has not responded in 30.000000 seconds).
PING: Waiting 4 seconds for response to ping
(1) Sent Status-Server Id 0 from 0.0.0.0:39123 to 192.168.0.1:1812 length 70
(1)   Message-Authenticator := 0x00
(1)   NAS-Identifier := "Status Check 0. Are you alive?"
PING: Next status packet in 30 seconds
(0) ERROR: Failing proxied request for user "user@somewhere.com", due to lack of any response from home server 192.168.0.1 port 1812
(0) Clearing existing &reply: attributes
(0) Found Post-Proxy-Type Fail-Authentication
(0) server default {
(0)   Post-Proxy-Type sub-section not found.  Ignoring.
(0)   # Executing group from file /etc/raddb/sites-enabled/default
(0) }
(0) Login incorrect (Home Server failed to respond): [user@somewhere.com] (from client localhost port 1)
(0) There was no response configured: rejecting request
(0) Using Post-Auth-Type Reject
(0) # Executing group from file /etc/raddb/sites-enabled/default
(0)   Post-Auth-Type REJECT {
(0) attr_filter.access_reject: EXPAND %{User-Name}
(0) attr_filter.access_reject:    --> user@somewhere.com
(0) attr_filter.access_reject: Matched entry DEFAULT at line 11
(0)     [attr_filter.access_reject] = updated
(0)     [eap] = noop
(0)     policy remove_reply_message_if_eap {
(0)       if (&reply:EAP-Message && &reply:Reply-Message) {
(0)       if (&reply:EAP-Message && &reply:Reply-Message)  -> FALSE
(0)       else {
(0)         [noop] = noop
(0)       } # else = noop
(0)     } # policy remove_reply_message_if_eap = noop
(0)   } # Post-Auth-Type REJECT = updated
(0) Sent Access-Reject Id 251 from 127.0.0.1:1812 to 127.0.0.1:34426 length 38
(0) Finished request
Waking up in 3.9 seconds.
No response to status check 1 ID 0 for home server 192.168.0.1 port 1812
Segmentation fault (core dumped)

Activities

elkhan

2024-10-01 17:48

developer   ~0001066

Last edited: 2024-10-01 17:50

Hi matejv,

Thanks for the detailed report.

Could you help us with the testing?
- Source: https://git.almalinux.org/rpms/freeradius/commit/0662efeff3ae57e560516529aaa80896003d6f7c
- Build: https://build.almalinux.org/build/19450

Instructions:
dnf config-manager --add-repo https://build.almalinux.org/pulp/content/builds/AlmaLinux-9-x86_64-19450-br/
dnf --refresh upgrade freeradius*

matejv

2024-11-21 11:25

reporter   ~0001089

Hi

Sorry for such late reply. I must have missed the email notification for your reply.

I installed freeradius as per your instructions but radiusd crashed because current AlmaLinux comes with openssl 3.2 and RPMs were build against openssl 3.0. So I rebuilt the source RPM (https://build.almalinux.org/pulp/content/builds/AlmaLinux-9-src-19450-br/Packages/f/freeradius-3.0.21-40.el9_4.alma.1.src.rpm). That version runs fine.

I also ran my tests for proxying with status-server enabled and radiusd works fine sending Status-Server packets. There are no more crashes.

So I would consider this issue fixed. Thank you!

Issue History

Date Modified Username Field Change
2024-09-06 11:46 matejv New Issue
2024-09-06 11:46 matejv File Added: freeradius_proxy_status-server_crash.txt
2024-10-01 17:48 elkhan Note Added: 0001066
2024-10-01 17:50 elkhan Note Edited: 0001066
2024-10-02 21:21 elkhan Assigned To => elkhan
2024-10-02 21:21 elkhan Status new => feedback
2024-11-21 11:25 matejv Note Added: 0001089
2024-11-21 11:25 matejv Status feedback => assigned