Segmentation Fault Triggered by Modifying Only pac_opaque_key in EAP-FAST Authentication Process

26 May 2025

      Hi!

We have identified an issue in FreeRADIUS version 3.2.7 where a segmentation fault occurs when performing EAP-FAST authentication after modifying only the pac_opaque_key.

Below is the debug log captured at the time of the segmentation fault:
====================
FreeRADIUS Version 3.2.7
Copyright (C) 1999-2023 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/local/share/freeradius/dictionary
including dictionary file /usr/local/share/freeradius/dictionary.dhcp
including dictionary file /usr/local/share/freeradius/dictionary.vqp
including dictionary file /usr/local/etc/raddb/dictionary
including configuration file /usr/local/etc/raddb/radiusd.conf
including configuration file /usr/local/etc/raddb/proxy.conf
including configuration file /usr/local/etc/raddb/clients.conf
including files in directory /usr/local/etc/raddb/mods-enabled/
including configuration file /usr/local/etc/raddb/mods-enabled/expr
including configuration file /usr/local/etc/raddb/mods-enabled/attr_filter
including configuration file /usr/local/etc/raddb/mods-enabled/preprocess
including configuration file /usr/local/etc/raddb/mods-enabled/linelog
including configuration file /usr/local/etc/raddb/mods-enabled/sradutmp
including configuration file /usr/local/etc/raddb/mods-enabled/replicate
including configuration file /usr/local/etc/raddb/mods-enabled/passwd
including configuration file /usr/local/etc/raddb/mods-enabled/detail.log
including configuration file /usr/local/etc/raddb/mods-enabled/radutmp
including configuration file /usr/local/etc/raddb/mods-enabled/unix
including configuration file /usr/local/etc/raddb/mods-enabled/digest
including configuration file /usr/local/etc/raddb/mods-enabled/always
including configuration file /usr/local/etc/raddb/mods-enabled/ntlm_auth
including configuration file /usr/local/etc/raddb/mods-enabled/realm
including configuration file /usr/local/etc/raddb/mods-enabled/totp
including configuration file /usr/local/etc/raddb/mods-enabled/unpack
including configuration file /usr/local/etc/raddb/mods-enabled/echo
including configuration file /usr/local/etc/raddb/mods-enabled/detail
including configuration file /usr/local/etc/raddb/mods-enabled/dynamic_clients
including configuration file /usr/local/etc/raddb/mods-enabled/files
including configuration file /usr/local/etc/raddb/mods-enabled/chap
including configuration file /usr/local/etc/raddb/mods-enabled/logintime
including configuration file /usr/local/etc/raddb/mods-enabled/pap
including configuration file /usr/local/etc/raddb/mods-enabled/eap
including configuration file /usr/local/etc/raddb/mods-enabled/mschap
including configuration file /usr/local/etc/raddb/mods-enabled/expiration
including configuration file /usr/local/etc/raddb/mods-enabled/proxy_rate_limit
including configuration file /usr/local/etc/raddb/mods-enabled/soh
including configuration file /usr/local/etc/raddb/mods-enabled/date
including configuration file /usr/local/etc/raddb/mods-enabled/utf8
including configuration file /usr/local/etc/raddb/mods-enabled/exec
including files in directory /usr/local/etc/raddb/policy.d/
including configuration file /usr/local/etc/raddb/policy.d/control
including configuration file /usr/local/etc/raddb/policy.d/filter
including configuration file /usr/local/etc/raddb/policy.d/canonicalization
including configuration file /usr/local/etc/raddb/policy.d/moonshot-targeted-ids
including configuration file /usr/local/etc/raddb/policy.d/operator-name
including configuration file /usr/local/etc/raddb/policy.d/cui
including configuration file /usr/local/etc/raddb/policy.d/dhcp
including configuration file /usr/local/etc/raddb/policy.d/debug
including configuration file /usr/local/etc/raddb/policy.d/abfab-tr
including configuration file /usr/local/etc/raddb/policy.d/eap
including configuration file /usr/local/etc/raddb/policy.d/rfc7542
including configuration file /usr/local/etc/raddb/policy.d/accounting
including files in directory /usr/local/etc/raddb/sites-enabled/
including configuration file /usr/local/etc/raddb/sites-enabled/default
including configuration file /usr/local/etc/raddb/sites-enabled/inner-tunnel
main {
 security {
  allow_core_dumps = no
 }
name = "radiusd"
prefix = "/usr/local"
localstatedir = "/usr/local/var"
logdir = "/usr/local/var/log/radius"
run_dir = "/usr/local/var/run/radiusd"
}
main {
name = "radiusd"
prefix = "/usr/local"
localstatedir = "/usr/local/var"
sbindir = "/usr/local/sbin"
logdir = "/usr/local/var/log/radius"
run_dir = "/usr/local/var/run/radiusd"
libdir = "/usr/local/lib"
radacctdir = "/usr/local/var/log/radius/radacct"
hostname_lookups = no
max_request_time = 30
proxy_dedup_window = 1
cleanup_delay = 5
max_requests = 16384
max_fds = 512
postauth_client_lost = no
pidfile = "/usr/local/var/run/radiusd/radiusd.pid"
checkrad = "/usr/local/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"
  allow_vulnerable_openssl = "no"
 }
 unlang {
  group_stop_return = no
  policy_stop_return = no
 }
}
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_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 = 0.0.0.0
  secret = <<< secret >>>
  nas_type = "other"
  proto = "*"
  limit {
  max_connections = 16
  lifetime = 0
  idle_timeout = 900
  }
 }
Shared secret for client localhost is short, and likely can be broken by an attacker.
 client localhost_ipv6 {
  ipv6addr = ::1
  secret = <<< secret >>>
  limit {
  max_connections = 16
  lifetime = 0
  idle_timeout = 30
  }
 }
Shared secret for client localhost_ipv6 is short, and likely can be broken by an attacker.
Debugger not attached
Configuration version: 92f8-a19c-a8b2-e589
 # Creating Auth-Type = mschap
 # Creating Auth-Type = digest
 # Creating Auth-Type = eap
 # Creating Auth-Type = PAP
 # Creating Auth-Type = CHAP
 # Creating Auth-Type = MS-CHAP
 # Creating Autz-Type = New-TLS-Connection
radiusd: #### Instantiating modules ####
 modules {
  # Loaded module rlm_expr
  # Loading module "expr" from file /usr/local/etc/raddb/mods-enabled/expr
  expr {
  safe_characters = "@abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.-_: /äéöüàâæçèéêëîïôœùûüaÿÄÉÖÜßÀÂÆÇÈÉÊËÎÏÔŒÙÛÜŸ"
  }
  # Loaded module rlm_attr_filter
  # Loading module "attr_filter.post-proxy" from file /usr/local/etc/raddb/mods-enabled/attr_filter
  attr_filter attr_filter.post-proxy {
  filename = "/usr/local/etc/raddb/mods-config/attr_filter/post-proxy"
  key = "%{Realm}"
  relaxed = no
  }
  # Loading module "attr_filter.pre-proxy" from file /usr/local/etc/raddb/mods-enabled/attr_filter
  attr_filter attr_filter.pre-proxy {
  filename = "/usr/local/etc/raddb/mods-config/attr_filter/pre-proxy"
  key = "%{Realm}"
  relaxed = no
  }
  # Loading module "attr_filter.access_reject" from file /usr/local/etc/raddb/mods-enabled/attr_filter
  attr_filter attr_filter.access_reject {
  filename = "/usr/local/etc/raddb/mods-config/attr_filter/access_reject"
  key = "%{User-Name}"
  relaxed = no
  }
  # Loading module "attr_filter.access_challenge" from file /usr/local/etc/raddb/mods-enabled/attr_filter
  attr_filter attr_filter.access_challenge {
  filename = "/usr/local/etc/raddb/mods-config/attr_filter/access_challenge"
  key = "%{User-Name}"
  relaxed = no
  }
  # Loading module "attr_filter.accounting_response" from file /usr/local/etc/raddb/mods-enabled/attr_filter
  attr_filter attr_filter.accounting_response {
  filename = "/usr/local/etc/raddb/mods-config/attr_filter/accounting_response"
  key = "%{User-Name}"
  relaxed = no
  }
  # Loading module "attr_filter.coa" from file /usr/local/etc/raddb/mods-enabled/attr_filter
  attr_filter attr_filter.coa {
  filename = "/usr/local/etc/raddb/mods-config/attr_filter/coa"
  key = "%{User-Name}"
  relaxed = no
  }
  # Loaded module rlm_preprocess
  # Loading module "preprocess" from file /usr/local/etc/raddb/mods-enabled/preprocess
  preprocess {
  huntgroups = "/usr/local/etc/raddb/mods-config/preprocess/huntgroups"
  hints = "/usr/local/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_linelog
  # Loading module "linelog" from file /usr/local/etc/raddb/mods-enabled/linelog
  linelog {
  filename = "/usr/local/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 /usr/local/etc/raddb/mods-enabled/linelog
  linelog log_accounting {
  filename = "/usr/local/var/log/radius/linelog-accounting"
  escape_filenames = no
  syslog_severity = "info"
  permissions = 384
  format = ""
  reference = "Accounting-Request.%{%{Acct-Status-Type}:-unknown}"
  }
  # Loaded module rlm_radutmp
  # Loading module "sradutmp" from file /usr/local/etc/raddb/mods-enabled/sradutmp
  radutmp sradutmp {
  filename = "/usr/local/var/log/radius/sradutmp"
  username = "%{User-Name}"
  case_sensitive = yes
  check_with_nas = yes
  permissions = 420
  caller_id = no
  }
  # Loaded module rlm_replicate
  # Loading module "replicate" from file /usr/local/etc/raddb/mods-enabled/replicate
  # Loaded module rlm_passwd
  # Loading module "etc_passwd" from file /usr/local/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_detail
  # Loading module "auth_log" from file /usr/local/etc/raddb/mods-enabled/detail.log
  detail auth_log {
  filename = "/usr/local/var/log/radius/radacct/%{%{Packet-Src-IP-Address}:-%{Packet-Src-IPv6-Address}}/auth-detail-%Y%m%d"
  header = "%t"
  permissions = 384
  locking = no
  dates_as_integer = no
  escape_filenames = no
  log_packet_header = no
  }
  # Loading module "reply_log" from file /usr/local/etc/raddb/mods-enabled/detail.log
  detail reply_log {
  filename = "/usr/local/var/log/radius/radacct/%{%{Packet-Src-IP-Address}:-%{Packet-Src-IPv6-Address}}/reply-detail-%Y%m%d"
  header = "%t"
  permissions = 384
  locking = no
  dates_as_integer = no
  escape_filenames = no
  log_packet_header = no
  }
  # Loading module "pre_proxy_log" from file /usr/local/etc/raddb/mods-enabled/detail.log
  detail pre_proxy_log {
  filename = "/usr/local/var/log/radius/radacct/%{%{Packet-Src-IP-Address}:-%{Packet-Src-IPv6-Address}}/pre-proxy-detail-%Y%m%d"
  header = "%t"
  permissions = 384
  locking = no
  dates_as_integer = no
  escape_filenames = no
  log_packet_header = no
  }
  # Loading module "post_proxy_log" from file /usr/local/etc/raddb/mods-enabled/detail.log
  detail post_proxy_log {
  filename = "/usr/local/var/log/radius/radacct/%{%{Packet-Src-IP-Address}:-%{Packet-Src-IPv6-Address}}/post-proxy-detail-%Y%m%d"
  header = "%t"
  permissions = 384
  locking = no
  dates_as_integer = no
  escape_filenames = no
  log_packet_header = no
  }
  # Loading module "radutmp" from file /usr/local/etc/raddb/mods-enabled/radutmp
  radutmp {
  filename = "/usr/local/var/log/radius/radutmp"
  username = "%{User-Name}"
  case_sensitive = yes
  check_with_nas = yes
  permissions = 384
  caller_id = yes
  }
  # Loaded module rlm_unix
  # Loading module "unix" from file /usr/local/etc/raddb/mods-enabled/unix
  unix {
  radwtmp = "/usr/local/var/log/radius/radwtmp"
  }
Creating attribute Unix-Group
  # Loaded module rlm_digest
  # Loading module "digest" from file /usr/local/etc/raddb/mods-enabled/digest
  # Loaded module rlm_always
  # Loading module "reject" from file /usr/local/etc/raddb/mods-enabled/always
  always reject {
  rcode = "reject"
  simulcount = 0
  mpp = no
  }
  # Loading module "fail" from file /usr/local/etc/raddb/mods-enabled/always
  always fail {
  rcode = "fail"
  simulcount = 0
  mpp = no
  }
  # Loading module "ok" from file /usr/local/etc/raddb/mods-enabled/always
  always ok {
  rcode = "ok"
  simulcount = 0
  mpp = no
  }
  # Loading module "handled" from file /usr/local/etc/raddb/mods-enabled/always
  always handled {
  rcode = "handled"
  simulcount = 0
  mpp = no
  }
  # Loading module "invalid" from file /usr/local/etc/raddb/mods-enabled/always
  always invalid {
  rcode = "invalid"
  simulcount = 0
  mpp = no
  }
  # Loading module "userlock" from file /usr/local/etc/raddb/mods-enabled/always
  always userlock {
  rcode = "userlock"
  simulcount = 0
  mpp = no
  }
  # Loading module "notfound" from file /usr/local/etc/raddb/mods-enabled/always
  always notfound {
  rcode = "notfound"
  simulcount = 0
  mpp = no
  }
  # Loading module "noop" from file /usr/local/etc/raddb/mods-enabled/always
  always noop {
  rcode = "noop"
  simulcount = 0
  mpp = no
  }
  # Loading module "updated" from file /usr/local/etc/raddb/mods-enabled/always
  always updated {
  rcode = "updated"
  simulcount = 0
  mpp = no
  }
  # Loaded module rlm_exec
  # Loading module "ntlm_auth" from file /usr/local/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
  }
  # Loaded module rlm_realm
  # Loading module "IPASS" from file /usr/local/etc/raddb/mods-enabled/realm
  realm IPASS {
  format = "prefix"
  delimiter = "/"
  ignore_default = no
  ignore_null = no
  }
  # Loading module "suffix" from file /usr/local/etc/raddb/mods-enabled/realm
  realm suffix {
  format = "suffix"
  delimiter = "@"
  ignore_default = no
  ignore_null = no
  }
  # Loading module "bangpath" from file /usr/local/etc/raddb/mods-enabled/realm
  realm bangpath {
  format = "prefix"
  delimiter = "!"
  ignore_default = no
  ignore_null = no
  }
  # Loading module "realmpercent" from file /usr/local/etc/raddb/mods-enabled/realm
  realm realmpercent {
  format = "suffix"
  delimiter = "%"
  ignore_default = no
  ignore_null = no
  }
  # Loading module "ntdomain" from file /usr/local/etc/raddb/mods-enabled/realm
  realm ntdomain {
  format = "prefix"
  delimiter = "\"
  ignore_default = no
  ignore_null = no
  }
  # Loaded module rlm_totp
  # Loading module "totp" from file /usr/local/etc/raddb/mods-enabled/totp
  totp {
  time_step = 30
  otp_length = 6
  lookback_steps = 1
  lookback_interval = 30
  lookforward_steps = 0
  }
  # Loaded module rlm_unpack
  # Loading module "unpack" from file /usr/local/etc/raddb/mods-enabled/unpack
  # Loading module "echo" from file /usr/local/etc/raddb/mods-enabled/echo
  exec echo {
  wait = yes
  program = "/bin/echo %{User-Name}"
  input_pairs = "request"
  output_pairs = "reply"
  shell_escape = yes
  }
  # Loading module "detail" from file /usr/local/etc/raddb/mods-enabled/detail
  detail {
  filename = "/usr/local/var/log/radius/radacct/%{%{Packet-Src-IP-Address}:-%{Packet-Src-IPv6-Address}}/detail-%Y%m%d"
  header = "%t"
  permissions = 384
  locking = no
  dates_as_integer = no
  escape_filenames = no
  log_packet_header = no
  }
  # Loaded module rlm_dynamic_clients
  # Loading module "dynamic_clients" from file /usr/local/etc/raddb/mods-enabled/dynamic_clients
  # Loaded module rlm_files
  # Loading module "files" from file /usr/local/etc/raddb/mods-enabled/files
  files {
  filename = "/usr/local/etc/raddb/mods-config/files/authorize"
  acctusersfile = "/usr/local/etc/raddb/mods-config/files/accounting"
  preproxy_usersfile = "/usr/local/etc/raddb/mods-config/files/pre-proxy"
  }
  # Loaded module rlm_chap
  # Loading module "chap" from file /usr/local/etc/raddb/mods-enabled/chap
  # Loaded module rlm_logintime
  # Loading module "logintime" from file /usr/local/etc/raddb/mods-enabled/logintime
  logintime {
  minimum_timeout = 60
  }
  # Loaded module rlm_pap
  # Loading module "pap" from file /usr/local/etc/raddb/mods-enabled/pap
  pap {
  normalise = yes
  }
  # Loaded module rlm_eap
  # Loading module "eap" from file /usr/local/etc/raddb/mods-enabled/eap
  eap {
  default_eap_type = "md5"
  timer_expire = 60
  max_eap_type = 52
  ignore_unknown_eap_types = no
  cisco_accounting_username_bug = no
  max_sessions = 16384
  dedup_key = ""
  }
  # Loaded module rlm_mschap
  # Loading module "mschap" from file /usr/local/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
  }
  # Loaded module rlm_expiration
  # Loading module "expiration" from file /usr/local/etc/raddb/mods-enabled/expiration
  # Loaded module rlm_proxy_rate_limit
  # Loading module "proxy_rate_limit" from file /usr/local/etc/raddb/mods-enabled/proxy_rate_limit
  proxy_rate_limit {
  max_entries = 2048
  idle_timeout = 10
  num_subtables = 256
  window = 1
  }
  # Loaded module rlm_soh
  # Loading module "soh" from file /usr/local/etc/raddb/mods-enabled/soh
  soh {
  dhcp = yes
  }
  # Loaded module rlm_date
  # Loading module "date" from file /usr/local/etc/raddb/mods-enabled/date
  date {
  format = "%b %e %Y %H:%M:%S %Z"
  utc = no
  }
  # Loading module "wispr2date" from file /usr/local/etc/raddb/mods-enabled/date
  date wispr2date {
  format = "%Y-%m-%dT%H:%M:%S"
  utc = no
  }
  # Loaded module rlm_utf8
  # Loading module "utf8" from file /usr/local/etc/raddb/mods-enabled/utf8
  # Loading module "exec" from file /usr/local/etc/raddb/mods-enabled/exec
  exec {
  wait = no
  input_pairs = "request"
  shell_escape = yes
  timeout = 10
  }
  instantiate {
  }
  # Instantiating module "attr_filter.post-proxy" from file /usr/local/etc/raddb/mods-enabled/attr_filter
reading pairlist file /usr/local/etc/raddb/mods-config/attr_filter/post-proxy
  # Instantiating module "attr_filter.pre-proxy" from file /usr/local/etc/raddb/mods-enabled/attr_filter
reading pairlist file /usr/local/etc/raddb/mods-config/attr_filter/pre-proxy
  # Instantiating module "attr_filter.access_reject" from file /usr/local/etc/raddb/mods-enabled/attr_filter
reading pairlist file /usr/local/etc/raddb/mods-config/attr_filter/access_reject
  # Instantiating module "attr_filter.access_challenge" from file /usr/local/etc/raddb/mods-enabled/attr_filter
reading pairlist file /usr/local/etc/raddb/mods-config/attr_filter/access_challenge
  # Instantiating module "attr_filter.accounting_response" from file /usr/local/etc/raddb/mods-enabled/attr_filter
reading pairlist file /usr/local/etc/raddb/mods-config/attr_filter/accounting_response
  # Instantiating module "attr_filter.coa" from file /usr/local/etc/raddb/mods-enabled/attr_filter
reading pairlist file /usr/local/etc/raddb/mods-config/attr_filter/coa
  # Instantiating module "preprocess" from file /usr/local/etc/raddb/mods-enabled/preprocess
reading pairlist file /usr/local/etc/raddb/mods-config/preprocess/huntgroups
reading pairlist file /usr/local/etc/raddb/mods-config/preprocess/hints
  # Instantiating module "linelog" from file /usr/local/etc/raddb/mods-enabled/linelog
  # Instantiating module "log_accounting" from file /usr/local/etc/raddb/mods-enabled/linelog
  # Instantiating module "etc_passwd" from file /usr/local/etc/raddb/mods-enabled/passwd
rlm_passwd: nfields: 3 keyfield 0(User-Name) listable: no
  # Instantiating module "auth_log" from file /usr/local/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 /usr/local/etc/raddb/mods-enabled/detail.log
  # Instantiating module "pre_proxy_log" from file /usr/local/etc/raddb/mods-enabled/detail.log
  # Instantiating module "post_proxy_log" from file /usr/local/etc/raddb/mods-enabled/detail.log
  # Instantiating module "reject" from file /usr/local/etc/raddb/mods-enabled/always
  # Instantiating module "fail" from file /usr/local/etc/raddb/mods-enabled/always
  # Instantiating module "ok" from file /usr/local/etc/raddb/mods-enabled/always
  # Instantiating module "handled" from file /usr/local/etc/raddb/mods-enabled/always
  # Instantiating module "invalid" from file /usr/local/etc/raddb/mods-enabled/always
  # Instantiating module "userlock" from file /usr/local/etc/raddb/mods-enabled/always
  # Instantiating module "notfound" from file /usr/local/etc/raddb/mods-enabled/always
  # Instantiating module "noop" from file /usr/local/etc/raddb/mods-enabled/always
  # Instantiating module "updated" from file /usr/local/etc/raddb/mods-enabled/always
  # Instantiating module "IPASS" from file /usr/local/etc/raddb/mods-enabled/realm
  # Instantiating module "suffix" from file /usr/local/etc/raddb/mods-enabled/realm
  # Instantiating module "bangpath" from file /usr/local/etc/raddb/mods-enabled/realm
  # Instantiating module "realmpercent" from file /usr/local/etc/raddb/mods-enabled/realm
  # Instantiating module "ntdomain" from file /usr/local/etc/raddb/mods-enabled/realm
  # Instantiating module "totp" from file /usr/local/etc/raddb/mods-enabled/totp
  # Instantiating module "detail" from file /usr/local/etc/raddb/mods-enabled/detail
  # Instantiating module "files" from file /usr/local/etc/raddb/mods-enabled/files
reading pairlist file /usr/local/etc/raddb/mods-config/files/authorize
reading pairlist file /usr/local/etc/raddb/mods-config/files/accounting
reading pairlist file /usr/local/etc/raddb/mods-config/files/pre-proxy
  # Instantiating module "logintime" from file /usr/local/etc/raddb/mods-enabled/logintime
  # Instantiating module "pap" from file /usr/local/etc/raddb/mods-enabled/pap
  # Instantiating module "eap" from file /usr/local/etc/raddb/mods-enabled/eap
   # Linked to sub-module rlm_eap_md5
   # 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 = "/usr/local/etc/raddb/certs"
   pem_file_type = yes
   private_key_file = "/usr/local/etc/raddb/certs/server.pem"
   certificate_file = "/usr/local/etc/raddb/certs/server.pem"
   ca_file = "/usr/local/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 = "DEFAULT"
   cipher_server_preference = no
   reject_unknown_intermediate_ca = no
   ecdh_curve = ""
   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 = "fast"
   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
   }
   # Linked to sub-module rlm_eap_mschapv2
   mschapv2 {
   with_ntdomain_hack = no
   send_error = no
   identity = "freeradius.example"
   }
   # Linked to sub-module rlm_eap_fast
   fast {
   tls = "tls-common"
   default_eap_type = "mschapv2"
   virtual_server = "inner-tunnel"
   cipher_list = "ALL:!EXPORT:!eNULL:!SSLv2"
   require_client_cert = no
   pac_lifetime = 604800
   authority_identity = "freeradius"
   pac_opaque_key = "D3EF443DF29944EB5E27B236F8086065"
   copy_request_to_tunnel = yes
   use_tunneled_reply = no
   }
tls: Using cached TLS configuration from previous invocation
  # Instantiating module "mschap" from file /usr/local/etc/raddb/mods-enabled/mschap
rlm_mschap (mschap): using internal authentication
  # Instantiating module "expiration" from file /usr/local/etc/raddb/mods-enabled/expiration
  # Instantiating module "proxy_rate_limit" from file /usr/local/etc/raddb/mods-enabled/proxy_rate_limit
 } # modules
radiusd: #### Loading Virtual Servers ####
server { # from file /usr/local/etc/raddb/radiusd.conf
} # server
server default { # from file /usr/local/etc/raddb/sites-enabled/default
 # Loading authenticate {...}
Compiling Auth-Type PAP for attr Auth-Type
Compiling Auth-Type CHAP for attr Auth-Type
Compiling Auth-Type MS-CHAP for attr Auth-Type
 # Loading authorize {...}
Ignoring "sql" (see raddb/mods-available/README.rst)
Ignoring "ldap" (see raddb/mods-available/README.rst)
Compiling Autz-Type New-TLS-Connection for attr Autz-Type
 # Loading preacct {...}
 # Loading accounting {...}
 # Loading post-auth {...}
Compiling Post-Auth-Type REJECT for attr Post-Auth-Type
Compiling Post-Auth-Type Challenge for attr Post-Auth-Type
Compiling Post-Auth-Type Client-Lost for attr Post-Auth-Type
} # server default
server inner-tunnel { # from file /usr/local/etc/raddb/sites-enabled/inner-tunnel
 # Loading authenticate {...}
Compiling Auth-Type PAP for attr Auth-Type
Compiling Auth-Type CHAP for attr Auth-Type
Compiling Auth-Type MS-CHAP for attr Auth-Type
 # Loading authorize {...}
 # Loading post-proxy {...}
 # Loading post-auth {...}
 # Skipping contents of 'if' as it is always 'false' -- /usr/local/etc/raddb/sites-enabled/inner-tunnel:366
Compiling Post-Auth-Type REJECT for attr Post-Auth-Type
} # server inner-tunnel
radiusd: #### Opening IP addresses and Ports ####
listen {
  type = "auth"
  ipaddr = *
  port = 0
   limit {
   max_connections = 16
   lifetime = 0
   idle_timeout = 900
   }
}
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
   }
}
listen {
  type = "auth"
  ipaddr = 127.0.0.1
  port = 18120
}
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 auth address 127.0.0.1 port 18120 bound to server inner-tunnel
Listening on proxy address * port 35763
Listening on proxy address :: port 43914
Ready to process requests
(0) Received Access-Request Id 0 from 10.27.253.116:35453 to 10.27.253.187:1812 length 132
(0)   User-Name = "anonymous"
(0)   NAS-IP-Address = 127.0.0.1
(0)   Calling-Station-Id = "02-00-00-00-00-01"
(0)   Framed-MTU = 1400
(0)   NAS-Port-Type = Wireless-802.11
(0)   Service-Type = Framed-User
(0)   Connect-Info = "CONNECT 11Mbps 802.11b"
(0)   EAP-Message = 0x020a000e01616e6f6e796d6f7573
(0)   Message-Authenticator = 0xcab062291ef86f8250861f7f1ff96e62
(0) # Executing section authorize from file /usr/local/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: No '@' in User-Name = "anonymous", looking up realm NULL
(0) suffix: No such realm "NULL"
(0)     [suffix] = noop
(0) eap: Peer sent EAP Response (code 2) ID 10 length 14
(0) eap: EAP-Identity reply, returning 'ok' so we can short-circuit the rest of authorize
(0)     [eap] = ok
(0)   } # authorize = ok
(0) Found Auth-Type = eap
(0) # Executing group from file /usr/local/etc/raddb/sites-enabled/default
(0)   authenticate {
(0) eap: Peer sent packet with method EAP Identity (1)
(0) eap: Using default_eap_type = MD5
(0) eap: Calling submodule eap_md5 to process data
(0) eap_md5: Issuing MD5 Challenge
(0) eap: Sending EAP Request (code 1) ID 11 length 22
(0) eap: EAP session adding &reply:State = 0xaee826abaee32297
(0)     [eap] = handled
(0)   } # authenticate = handled
(0) Using Post-Auth-Type Challenge
(0) # Executing group from file /usr/local/etc/raddb/sites-enabled/default
(0)   Challenge { ... } # empty sub-section is ignored
(0) Sent Access-Challenge Id 0 from 10.27.253.187:1812 to 10.27.253.116:35453 length 80
(0)   EAP-Message = 0x010b001604105828ed1880462a5b6a241c1404973cb6
(0)   Message-Authenticator = 0x00000000000000000000000000000000
(0)   State = 0xaee826abaee32297218f24d02553b7f2
(0) Finished request
Waking up in 4.9 seconds.
(1) Received Access-Request Id 1 from 10.27.253.116:35453 to 10.27.253.187:1812 length 142
(1)   User-Name = "anonymous"
(1)   NAS-IP-Address = 127.0.0.1
(1)   Calling-Station-Id = "02-00-00-00-00-01"
(1)   Framed-MTU = 1400
(1)   NAS-Port-Type = Wireless-802.11
(1)   Service-Type = Framed-User
(1)   Connect-Info = "CONNECT 11Mbps 802.11b"
(1)   EAP-Message = 0x020b0006032b
(1)   State = 0xaee826abaee32297218f24d02553b7f2
(1)   Message-Authenticator = 0x8151d591e61e8ebebf6d360d2ba40588
(1) session-state: No cached attributes
(1) # Executing section authorize from file /usr/local/etc/raddb/sites-enabled/default
(1)   authorize {
(1)     policy filter_username {
(1)       if (&User-Name) {
(1)       if (&User-Name)  -> TRUE
(1)       if (&User-Name)  {
(1)         if (&User-Name =~ / /) {
(1)         if (&User-Name =~ / /)  -> FALSE
(1)         if (&User-Name =~ /@[^@]*@/ ) {
(1)         if (&User-Name =~ /@[^@]*@/ )  -> FALSE
(1)         if (&User-Name =~ /\.\./ ) {
(1)         if (&User-Name =~ /\.\./ )  -> FALSE
(1)         if ((&User-Name =~ /@/) && (&User-Name !~ /@(.+)\.(.+)$/))  {
(1)         if ((&User-Name =~ /@/) && (&User-Name !~ /@(.+)\.(.+)$/))   -> FALSE
(1)         if (&User-Name =~ /\.$/)  {
(1)         if (&User-Name =~ /\.$/)   -> FALSE
(1)         if (&User-Name =~ /@\./)  {
(1)         if (&User-Name =~ /@\./)   -> FALSE
(1)       } # if (&User-Name)  = notfound
(1)     } # policy filter_username = notfound
(1)     [preprocess] = ok
(1)     [chap] = noop
(1)     [mschap] = noop
(1)     [digest] = noop
(1) suffix: Checking for suffix after "@"
(1) suffix: No '@' in User-Name = "anonymous", looking up realm NULL
(1) suffix: No such realm "NULL"
(1)     [suffix] = noop
(1) eap: Peer sent EAP Response (code 2) ID 11 length 6
(1) eap: No EAP Start, assuming it's an on-going EAP conversation
(1)     [eap] = updated
(1)     [files] = noop
(1)     [expiration] = noop
(1)     [logintime] = noop
Not doing PAP as Auth-Type is already set.
(1)     [pap] = noop
(1)   } # authorize = updated
(1) Found Auth-Type = eap
(1) # Executing group from file /usr/local/etc/raddb/sites-enabled/default
(1)   authenticate {
(1) eap: Removing EAP session with state 0xaee826abaee32297
(1) eap: Previous EAP request found for state 0xaee826abaee32297, released from the list
(1) eap: Peer sent packet with method EAP NAK (3)
(1) eap: Found mutually acceptable type FAST (43)
(1) eap: Found compatible type in NAK - EAP-Type = FAST
(1) eap: Calling submodule eap_fast to process data
(1) eap_fast: (TLS) FAST -Initiating new session
(1) eap_fast: Over-riding main cipher list with 'ALL:!EXPORT:!eNULL:!SSLv2'
(1) eap_fast: Setting security level to 0 to allow anonymous cipher suites
(1) eap: Sending EAP Request (code 1) ID 12 length 26
(1) eap: EAP session adding &reply:State = 0xaee826abafe40d97
(1)     [eap] = handled
(1)   } # authenticate = handled
(1) Using Post-Auth-Type Challenge
(1) # Executing group from file /usr/local/etc/raddb/sites-enabled/default
(1)   Challenge { ... } # empty sub-section is ignored
(1) session-state: Saving cached attributes
(1)   Framed-MTU = 984
(1) Sent Access-Challenge Id 1 from 10.27.253.187:1812 to 10.27.253.116:35453 length 84
(1)   EAP-Message = 0x010c001a2b2100040010ebad53172137d2c5c387b6351e705ae2
(1)   Message-Authenticator = 0x00000000000000000000000000000000
(1)   State = 0xaee826abafe40d97218f24d02553b7f2
(1) Finished request
Waking up in 4.9 seconds.
(2) Received Access-Request Id 2 from 10.27.253.116:35453 to 10.27.253.187:1812 length 434
(2)   User-Name = "anonymous"
(2)   NAS-IP-Address = 127.0.0.1
(2)   Calling-Station-Id = "02-00-00-00-00-01"
(2)   Framed-MTU = 1400
(2)   NAS-Port-Type = Wireless-802.11
(2)   Service-Type = Framed-User
(2)   Connect-Info = "CONNECT 11Mbps 802.11b"
(2)   EAP-Message = 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
(2)   State = 0xaee826abafe40d97218f24d02553b7f2
(2)   Message-Authenticator = 0x0c43e6875536fdfc2f51ff168369acf8
(2) Restoring &session-state
(2)   &session-state:Framed-MTU = 984
(2) # Executing section authorize from file /usr/local/etc/raddb/sites-enabled/default
(2)   authorize {
(2)     policy filter_username {
(2)       if (&User-Name) {
(2)       if (&User-Name)  -> TRUE
(2)       if (&User-Name)  {
(2)         if (&User-Name =~ / /) {
(2)         if (&User-Name =~ / /)  -> FALSE
(2)         if (&User-Name =~ /@[^@]*@/ ) {
(2)         if (&User-Name =~ /@[^@]*@/ )  -> FALSE
(2)         if (&User-Name =~ /\.\./ ) {
(2)         if (&User-Name =~ /\.\./ )  -> FALSE
(2)         if ((&User-Name =~ /@/) && (&User-Name !~ /@(.+)\.(.+)$/))  {
(2)         if ((&User-Name =~ /@/) && (&User-Name !~ /@(.+)\.(.+)$/))   -> FALSE
(2)         if (&User-Name =~ /\.$/)  {
(2)         if (&User-Name =~ /\.$/)   -> FALSE
(2)         if (&User-Name =~ /@\./)  {
(2)         if (&User-Name =~ /@\./)   -> FALSE
(2)       } # if (&User-Name)  = notfound
(2)     } # policy filter_username = notfound
(2)     [preprocess] = ok
(2)     [chap] = noop
(2)     [mschap] = noop
(2)     [digest] = noop
(2) suffix: Checking for suffix after "@"
(2) suffix: No '@' in User-Name = "anonymous", looking up realm NULL
(2) suffix: No such realm "NULL"
(2)     [suffix] = noop
(2) eap: Peer sent EAP Response (code 2) ID 12 length 296
(2) eap: Continuing tunnel setup
(2)     [eap] = ok
(2)   } # authorize = ok
(2) Found Auth-Type = eap
(2) # Executing group from file /usr/local/etc/raddb/sites-enabled/default
(2)   authenticate {
(2) eap: Removing EAP session with state 0xaee826abafe40d97
(2) eap: Previous EAP request found for state 0xaee826abafe40d97, released from the list
(2) eap: Peer sent packet with method EAP FAST (43)
(2) eap: Calling submodule eap_fast to process data
(2) eap_fast: Authenticate
(2) eap_fast: (TLS) EAP Done initial handshake
(2) eap_fast: (TLS) FAST - Handshake state - before SSL initialization
(2) eap_fast: (TLS) FAST - Handshake state - Server before SSL initialization
(2) eap_fast: (TLS) FAST - Handshake state - Server before SSL initialization
(2) eap_fast: (TLS) FAST - recv TLS 1.3 Handshake, ClientHello
(2) eap_fast: PAC provided via ClientHello SessionTicket extension
zsh: segmentation fault  sudo /usr/local/sbin/radiusd -X
====================

Steps to reproduce:
・Perform EAP-FAST authentication successfully.
・Stop FreeRADIUS and modify only the pac_opaque_key.
・Attempt EAP-FAST authentication again with the same user.
・FreeRADIUS crashes due to a segmentation fault.

Cause:
We have confirmed that the EVP_DecryptFinal_ex function returns either 1 or 0, but the return value is being checked using a condition that evaluates whether it is less than 0. This leads to a segmentation fault.

Resolution:

Our investigation revealed that the issue can be avoided by applying the following modification:

src/modules/rlm_eap/types/rlm_eap_fast/eap_fast_crypto.c  
====================
-    if (ret < 0) return -1;
+    if (ret == 0) return -1;
====================

/早川

Segmentation Fault Triggered by Modifying Only pac_opaque_key in EAP-FAST Authentication Process

早川 拓人

早川拓人