WPA_SUPPLICANT.CONF(5) MidnightBSD File Formats Manual WPA_SUPPLICANT.CONF(5)

NAME

wpa_supplicant.conf — configuration file for wpa_supplicant(8)

DESCRIPTION

The wpa_supplicant(8) utility is an implementation of the WPA Supplicant component, i.e., the part that runs in the client stations. It implements WPA key negotiation with a WPA Authenticator and EAP authentication with Authentication Server using configuration information stored in a text file.

The configuration file consists of optional global parameter settings and one or more network blocks, e.g. one for each used SSID. The wpa_supplicant(8) utility will automatically select the best network based on the order of the network blocks in the configuration file, network security level (WPA/WPA2 is preferred), and signal strength. Comments are indicated with the ‘#’ character; all text to the end of the line will be ignored.

GLOBAL PARAMETERS

Default parameters used by wpa_supplicant(8) may be overridden by specifying

parameter=value

in the configuration file (note no spaces are allowed). Values with embedded spaces must be enclosed in quote marks.

The following parameters are recognized:

ctrl_interface

The pathname of the directory in which wpa_supplicant(8) creates UNIX domain socket files for communication with frontend programs such as wpa_cli(8).

ctrl_interface_group

A group name or group ID to use in setting protection on the control interface file. This can be set to allow non-root users to access the control interface files. If no group is specified, the group ID of the control interface is not modified and will, typically, be the group ID of the directory in which the socket is created.

eapol_version

The IEEE 802.1x/EAPOL protocol version to use; either 1 (default) or 2. The wpa_supplicant(8) utility is implemented according to IEEE 802-1X-REV-d8 which defines EAPOL version to be 2. However, some access points do not work when presented with this version so by default wpa_supplicant(8) will announce that it is using EAPOL version 1. If version 2 must be announced for correct operation with an access point, this value may be set to 2.

ap_scan

Access point scanning and selection control; one of 0, 1 (default), or 2. Only setting 1 should be used with the wlan(4) module; the other settings are for use on other operating systems.

fast_reauth

EAP fast re-authentication; either 1 (default) or 0. Control fast re-authentication support in EAP methods that support it.

NETWORK BLOCKS

Each potential network/access point should have a ‘‘network block’’ that describes how to identify it and how to set up security. When multiple network blocks are listed in a configuration file, the highest priority one is selected for use or, if multiple networks with the same priority are identified, the first one listed in the configuration file is used.

A network block description is of the form:

network={

parameter=value

...

}

(note the leading "network={" may have no spaces). The block specification contains one or more parameters from the following list:

ssid (required)

Network name (as announced by the access point). An ASCII or hex string enclosed in quotation marks.

scan_ssid

SSID scan technique; 0 (default) or 1. Technique 0 scans for the SSID using a broadcast Probe Request frame while 1 uses a directed Probe Request frame. Access points that cloak themselves by not broadcasting their SSID require technique 1, but beware that this scheme can cause scanning to take longer to complete.

bssid

Network BSSID (typically the MAC address of the access point).

priority

The priority of a network when selecting among multiple networks; a higher value means a network is more desirable. By default networks have priority 0. When multiple networks with the same priority are considered for selection, other information such as security policy and signal strength are used to select one.

mode

IEEE 802.11 operation mode; either 0 (infrastructure, default) or 1 (IBSS). Note that IBSS (adhoc) mode can only be used with key_mgmt set to NONE (plaintext and static WEP).

proto

List of acceptable protocols; one or more of: WPA (IEEE 802.11i/D3.0) and RSN (IEEE 802.11i). WPA2 is another name for RSN. If not set this defaults to "WPA RSN".

key_mgmt

List of acceptable key management protocols; one or more of: WPA-PSK (WPA pre-shared key), WPA-EAP (WPA using EAP authentication), IEEE8021X (IEEE 802.1x using EAP authentication and, optionally, dynamically generated WEP keys), NONE (plaintext or static WEP keys). If not set this defaults to "WPA-PSK WPA-EAP".

auth_alg

List of allowed IEEE 802.11 authentication algorithms; one or more of: OPEN (Open System authentication, required for WPA/WPA2), SHARED (Shared Key authentication), LEAP (LEAP/Network EAP). If not set automatic selection is used (Open System with LEAP enabled if LEAP is allowed as one of the EAP methods).

pairwise

List of acceptable pairwise (unicast) ciphers for WPA; one or more of: CCMP (AES in Counter mode with CBC-MAC, RFC 3610, IEEE 802.11i/D7.0), TKIP (Temporal Key Integrity Protocol, IEEE 802.11i/D7.0), NONE (deprecated). If not set this defaults to "CCMP TKIP".

group

List of acceptable group (multicast) ciphers for WPA; one or more of: CCMP (AES in Counter mode with CBC-MAC, RFC 3610, IEEE 802.11i/D7.0), TKIP (Temporal Key Integrity Protocol, IEEE 802.11i/D7.0), WEP104 (WEP with 104-bit key), WEP40 (WEP with 40-bit key). If not set this defaults to "CCMP TKIP WEP104 WEP40".

psk

WPA preshared key used in WPA-PSK mode. The key is specified as 64 hex digits or as an 8-63 character ASCII passphrase. ASCII passphrases are dynamically converted to a 256-bit key at runtime using the network SSID, or they can be statically converted at configuration time using the wpa_passphrase(8) utility.

eapol_flags

Dynamic WEP key usage for non-WPA mode, specified as a bit field. Bit 0 (1) forces dynamically generated unicast WEP keys to be used. Bit 1 (2) forces dynamically generated broadcast WEP keys to be used. By default this is set to 3 (use both).

eap

List of acceptable EAP methods; one or more of: MD5 (EAP-MD5, cannot be used with WPA, used only as a Phase 2 method with EAP-PEAP or EAP-TTLS), MSCHAPV2 (EAP-MSCHAPV2, cannot be used with WPA; used only as a Phase 2 method with EAP-PEAP or EAP-TTLS), OTP (EAP-OTP, cannot be used with WPA; used only as a Phase 2 metod with EAP-PEAP or EAP-TTLS), GTC (EAP-GTC, cannot be used with WPA; used only as a Phase 2 metod with EAP-PEAP or EAP-TTLS), TLS (EAP-TLS, client and server certificate), PEAP (EAP-PEAP, with tunneled EAP authentication), TTLS (EAP-TTLS, with tunneled EAP or PAP/CHAP/MSCHAP/MSCHAPV2 authentication). If not set this defaults to all available methods compiled in to wpa_supplicant(8). Note that by default wpa_supplicant(8) is compiled with EAP support; see make.conf(5) for the NO_WPA_SUPPLICANT_EAPOL configuration variable that can be used to disable EAP support.

identity

Identity string for EAP.

anonymous_identity

Anonymous identity string for EAP (to be used as the unencrypted identity with EAP types that support different tunneled identities; e.g. EAP-TTLS).

mixed_cell

Configure whether networks that allow both plaintext and encryption are allowed when selecting a BSS from the scan results. By default this is set to 0 (disabled).

password

Password string for EAP.

ca_cert

Pathname to CA certificate file. This file can have one or more trusted CA certificates. If ca_cert is not included, server certificates will not be verified (not recommended).

client_cert

Pathname to client certificate file (PEM/DER).

private_key

Pathname to a client private key file (PEM/DER/PFX). When a PKCS#12/PFX file is used, then client_cert should not be specified as both the private key and certificate will be read from PKCS#12 file.

private_key_passwd

Password for any private key file.

dh_file

Pathname to a file holding DH/DSA parameters (in PEM format). This file holds parameters for an ephemeral DH key exchange. In most cases, the default RSA authentication does not use this configuration. However, it is possible to set up RSA to use an ephemeral DH key exchange. In addition, ciphers with DSA keys always use ephemeral DH keys. This can be used to achieve forward secrecy. If the dh_file is in DSA parameters format, it will be automatically converted into DH params.

subject_match

Substring to be matched against the subject of the authentication server certificate. If this string is set, the server certificate is only accepted if it contains this string in the subject. The subject string is in following format:

/C=US/ST=CA/L=San Francisco/CN=Test AS/emailAddress=as@example.com

phase1

Phase1 (outer authentication, i.e., TLS tunnel) parameters (string with field-value pairs, e.g., "peapver=0" or "peapver=1 peaplabel=1").

peapver

can be used to force which PEAP version (0 or 1) is used.

peaplabel=1

can be used to force new label, ‘‘client PEAP encryption’’, to be used during key derivation when PEAPv1 or newer. Most existing PEAPv1 implementations seem to be using the old label, ‘‘client EAP encryption’’, and wpa_supplicant(8) is now using that as the default value. Some servers, e.g., Radiator, may require peaplabel=1 configuration to interoperate with PEAPv1; see eap_testing.txt for more details.

peap_outer_success=0

can be used to terminate PEAP authentication on tunneled EAP-Success. This is required with some RADIUS servers that implement draft-josefsson-pppext-eap-tls-eap-05.txt (e.g., Lucent NavisRadius v4.4.0 with PEAP in ‘‘IETF Draft 5’’ mode).

include_tls_length=1

can be used to force wpa_supplicant(8) to include TLS Message Length field in all TLS messages even if they are not fragmented.

sim_min_num_chal=3

can be used to configure EAP-SIM to require three challenges (by default, it accepts 2 or 3)

fast_provisioning=1

option enables in-line provisioning of EAP-FAST credentials (PAC).

phase2

phase2: Phase2 (inner authentication with TLS tunnel) parameters (string with field-value pairs, e.g., "auth=MSCHAPV2" for EAP-PEAP or "autheap=MSCHAPV2 autheap=MD5" for EAP-TTLS).

ca_cert2

Like ca_cert but for EAP inner Phase 2.

client_cert2

Like client_cert but for EAP inner Phase 2.

private_key2

Like private_key but for EAP inner Phase 2.

private_key2_passwd

Like private_key_passwd but for EAP inner Phase 2.

dh_file2

Like dh_file but for EAP inner Phase 2.

subject_match2

Like subject_match but for EAP inner Phase 2.

eappsk

16-byte pre-shared key in hex format for use with EAP-PSK.

nai

User NAI for use with EAP-PSK.

server_nai

Authentication Server NAI for use with EAP-PSK.

pac_file

Pathname to the file to use for PAC entries with EAP-FAST. The wpa_supplicant(8) utility must be able to create this file and write updates to it when PAC is being provisioned or refreshed.

eap_workaround

Enable/disable EAP workarounds for various interoperability issues with misbehaving authentication servers. By default these workarounds are enabled. String EAP conformance can be configured by setting this to 0.

CERTIFICATES

Some EAP authentication methods require use of certificates. EAP-TLS uses both server- and client-side certificates, whereas EAP-PEAP and EAP-TTLS only require a server-side certificate. When a client certificate is used, a matching private key file must also be included in configuration. If the private key uses a passphrase, this has to be configured in the wpa_supplicant.conf file as private_key_passwd.

The wpa_supplicant(8) utility supports X.509 certificates in PEM and DER formats. User certificate and private key can be included in the same file.

If the user certificate and private key is received in PKCS#12/PFX format, they need to be converted to a suitable PEM/DER format for use by wpa_supplicant(8). This can be done using the openssl(1) program, e.g. with the following commands:

# convert client certificate and private key to PEM format
openssl pkcs12 -in example.pfx -out user.pem -clcerts
# convert CA certificate (if included in PFX file) to PEM format
openssl pkcs12 -in example.pfx -out ca.pem -cacerts -nokeys

EXAMPLES

WPA-Personal (PSK) as a home network and WPA-Enterprise with EAP-TLS as a work network:

# allow frontend (e.g., wpa_cli) to be used by all users in ’wheel’ group
ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=wheel
#
# home network; allow all valid ciphers
network={
ssid="home"
scan_ssid=1
key_mgmt=WPA-PSK
psk="very secret passphrase"
}
#
# work network; use EAP-TLS with WPA; allow only CCMP and TKIP ciphers
network={
ssid="work"
scan_ssid=1
key_mgmt=WPA-EAP
pairwise=CCMP TKIP
group=CCMP TKIP
eap=TLS
identity="user@example.com"
ca_cert="/etc/cert/ca.pem"
client_cert="/etc/cert/user.pem"
private_key="/etc/cert/user.prv"
private_key_passwd="password"
}

WPA-RADIUS/EAP-PEAP/MSCHAPv2 with RADIUS servers that use old peaplabel (e.g., Funk Odyssey and SBR, Meetinghouse Aegis, Interlink RAD-Series):

ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=wheel
network={
ssid="example"
scan_ssid=1
key_mgmt=WPA-EAP
eap=PEAP
identity="user@example.com"
password="foobar"
ca_cert="/etc/cert/ca.pem"
phase1="peaplabel=0"
phase2="auth=MSCHAPV2"
}

EAP-TTLS/EAP-MD5-Challenge configuration with anonymous identity for the unencrypted use. Real identity is sent only within an encrypted TLS tunnel.

ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=wheel
network={
ssid="example"
scan_ssid=1
key_mgmt=WPA-EAP
eap=TTLS
identity="user@example.com"
anonymous_identity="anonymous@example.com"
password="foobar"
ca_cert="/etc/cert/ca.pem"
phase2="auth=MD5"
}

Traditional WEP configuration with 104 bit key specified in hexadecimal. Note the WEP key is not quoted.

ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=wheel
network={
ssid="example"
scan_ssid=1
key_mgmt=NONE
wep_tx_keyidx=0
wep_key0=42FEEDDEAFBABEDEAFBEEFAA55
}

SEE ALSO

wpa_cli(8), wpa_passphrase(8), wpa_supplicant(8)

HISTORY

The wpa_supplicant.conf manual page and wpa_supplicant(8) functionality first appeared in FreeBSD 6.0.

AUTHORS

This manual page is derived from the README and wpa_supplicant.conf files in the wpa_supplicant distribution provided by Jouni Malinen 〈jkmaline@cc.hut.fi〉.

MidnightBSD 0.3 July 8, 2007 MidnightBSD 0.3