/usr/share/freeradius/dictionary.wifialliance is in freeradius-common 3.0.12+dfsg-5+deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84  | # -*- text -*-
# Copyright (C) 2015 The FreeRADIUS Server project and contributors
##############################################################################
#
#       WiFi-Alliance attributes for Hotspot 2.0
#
#       $Id: 124f062362c9d95403ab27b290e07f80a5b0ea6e $
#
##############################################################################
VENDOR		WiFi-Alliance			40808
BEGIN-VENDOR	WiFi-Alliance
#  0                   1                   2                   3
#   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
#  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
#  | Server Method | Subscription Remediation Server URL
#  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
#
#  Server Method
#
#	0 = OMA DM
#	1 = Soap XML SPP
#	2..255 reserved
#
ATTRIBUTE	HS20-Subscription-Remediation-Needed	1	octets
ATTRIBUTE	HS20-AP-Version				2	byte
#  0                   1                   2                   3
#   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
#  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
#  |    Version    |    PPS MO UpdateIdentifier    |
#  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
#
#  Version
#
#	0 = release 1
#	1 = release 2
#
ATTRIBUTE	HS20-Mobile-Device-Version		3	octets
#  0                   1                   2                   3
#   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
#  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
#  |      Code     |        Re-auth Delay          |     URL
#  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
#
#  Code
#
#	0 = User's subscription does not allow or no longer allows access at this BSS
#	1 = User's subscription does not allow or no longer allows access at this ESS
#
#
#  Re-Auth delay = delay in seconds that a mobile device waits before attempting
#  	   	   reassociation.
#		   0 == delay is decided by the mobile device.
#
#  URL = UTF-8 encoded URL.
#  	Which provides a webpage explaining why the mobile device was
#	not authorized (or is no longer authorized)
#
ATTRIBUTE	HS20-Deauthentication-Request		4	octets
#  0                   1                   2                   3
#   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
#  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
#  |       SWT     |   Session Information URL
#  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
#
#  SWT = Session Warning Time is the number of minutes of advance
#  notice an AP shall provide to the mobile device before terminating
#  its session. When SWT is set to the special value of 255, the AP
#  (802.1X authenticator) chooses the session warning time value.
#
#  Session Information URL field: URL which is transmitted to a mobile
#  device in a BSS Transition Management Request frame SWT minutes
#  before the mobile device’s session is terminated. The URL provides
#  the location of a webpage with information for the user on how to
#  extend the session.
#
ATTRIBUTE	HS20-Session-Information-URL		5	octets
END-VENDOR    WiFi-Alliance
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