|Developer(s)||Jouni Malinen and others|
|Initial release||April 5, 2003|
2.9 / August 7, 2019
wpa_supplicant is a free software implementation of an IEEE 802.11i supplicant for Linux, FreeBSD, NetBSD, QNX, AROS, Microsoft Windows, Solaris, OS/2 (including ArcaOS and eComStation) and Haiku. In addition to being a WPA3 and WPA2 supplicant, it also implements WPA and older wireless LAN security protocols.
- WPA-PSK and WPA2-PSK ("WPA-Personal", pre-shared key)
- WPA with EAP ("WPA-Enterprise", for example with RADIUS authentication server)
- RSN: PMKSA caching, pre-authentication
- IEEE 802.11r
- IEEE 802.11w
- Wi-Fi Protected Setup (WPS)
Included with the supplicant are a GUI and a command-line utility for interacting with the running supplicant. From either of these interfaces it is possible to review a list of currently visible networks, select one of them, provide any additional security information needed to authenticate with the network (for example, a passphrase, or username and password) and add it to the preference list to enable automatic reconnection in the future.
The graphical user interface is built on top of the Qt library.
wpa_supplicant can authenticate with any of the following EAP (Extensible Authentication Protocol) methods: EAP-TLS, EAP-PEAP (both PEAPv0 and PEAPv1), EAP-TTLS, EAP-SIM, EAP-AKA, EAP-AKA', EAP-pwd, EAP-EKE, EAP-PSK (experimental), EAP-FAST, EAP-PAX, EAP-SAKE, EAP-GPSK, EAP-IKEv2, EAP-MD5, EAP-MSCHAPv2, and LEAP (requires special functions in the driver).
Vulnerability to KRACK
wpa_supplicant was especially susceptible to KRACK, as it can be manipulated to install an all-zeros encryption key, effectively nullifying WPA2 protection in a man-in-the-middle attack. Version 2.7 fixed KRACK and several other vulnerabilities.
- "Index of /releases". w1.fi. 2019-08-07. Retrieved 2019-10-23.
- "wpa_supplicant". Retrieved 2020-09-03.
- haiku/wpa_supplicant, Haiku, 2019-03-17, retrieved 2020-03-07
- "wpa_supplicant(8) - Linux man page". Retrieved 2020-03-07.
- "wpa_supplicant". wiki.archlinux.org. Retrieved 2021-05-18.
- "Linux WPA Supplicant (IEEE 802.1X, WPA, WPA2, RSN, IEEE 802.11i)". w1.fi. Retrieved 2014-07-04.
- "Key Reinstallation Attacks disclosure website". KRACK Attacks. Retrieved 26 September 2018.
Linux's wpa_supplicant v2.6 is also vulnerable to the installation of an all-zero encryption key in the 4-way handshake.