prosody-modules: mod_auth_internal_yubikey/README.markdown annotate

annotate mod_auth_internal_yubikey/README.markdown @ 5243:d5dc8edb2695

mod_http_oauth2: Use more compact IDs UUIDs are nice but so verbose! The reduction in entropy for the nonce should be fine since the timestamp is also counts towards this, and it changes every second (modulo clock shenanigans), so the chances of someone managing to get the same client_secret by registering with the same information at the same time as another entity should be negligible.

author	Kim Alvefur <zash@zash.se>
date	Sat, 11 Mar 2023 22:46:27 +0100
parents	4d73a1a6ba68
children

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1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	1 ---
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	2 labels:
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	3 - 'Stage-Beta'
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	4 - 'Type-Auth'
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	5 summary: 'Two-factor authentication using Yubikeys'
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	6 ...
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	7
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	8 Introduction
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	9 ============
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	10
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	11 A [YubiKey](http://www.yubico.com/yubikey) is a small USB
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	12 one-time-password (OTP) generator.
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	13
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	14 The idea behind one-time-passwords is that they can, well, only be used
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	15 once. After authenticating with an OTP the only way to log in again is
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	16 to calculate another one and use that. The only (practical) way to
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	17 generate this is by inserting the (correct) Yubikey and pressing its
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	18 button. Acting as a USB keyboard it then "types" the OTP into the
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	19 password prompt of your XMPP client.
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	20
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	21 Details
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	22 =======
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	23
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	24 This self-contained module handles all the authentication of Yubikeys,
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	25 it does not for example depend on the Yubico authentication service, or
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	26 on any external system service such as PAM.
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	27
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	28 When this module is enabled, only PLAIN authentication is enabled on the
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	29 server (because Prosody needs to receive the full password from the
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	30 client to decode it, not a hash), so connection encryption will
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	31 automatically be enforced by Prosody.
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	32
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	33 Even if the password is intercepted it is of little use to the attacker
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	34 as it expires as soon as it is used. Additionally the data stored in
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	35 Prosody's DB is not enough to authenticate as the user if stolen by the
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	36 attacker.
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	37
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	38 When this module is in use each user can either use normal password
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	39 authentication, or instead have their account associated with a
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	40 Yubikey - at which point only the key will work.
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	41
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	42 Installation
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	43 ============
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	44
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	45 Requires bitlib for Lua, and yubikey-lua from
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	46 http://code.matthewwild.co.uk/yubikey-lua . When properly installed, the
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	47 command `lua -lbit -lyubikey` should give you a Lua prompt with no
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	48 errors.
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	49
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	50 Configuration
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	51 =============
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	52
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	53 Associating keys
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	54 ----------------
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	55
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	56 Each Yubikey is configured with several pieces of information that
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	57 Prosody needs to know. This information is shown in the Yubikey
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	58 personalization tool (the yubikey-personalization package in
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	59 Debian/Ubuntu).
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	60
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	61 To associate a Yubikey with a user, run the following prosodyctl
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	62 command:
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	63
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	64 prosodyctl mod_auth_internal_yubikey associate user@example.com
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	65
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	66 This will run you through a series of questions about the information
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	67 Prosody requires about the key configuration.
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	68
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	69 NOTE: All keys used with the server (rather, with a given host) must
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	70 all have a "public ID" (uid) of the same length. This length must be set
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	71 in the Prosody config with the 'yubikey\_prefix\_length' option.
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	72
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	73 Instead of entering the information interactively it is also possible to
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	74 specify each option on the command-line (useful for automation)
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	75 via --option="value". The valid options are:
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	76
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	77 password The user's password (may be blank)
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	78 ---------- --------------------------------------------------------------------------------------------
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	79 fixed The public ID that the Yubikey prefixes to the OTP
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	80 uid The private ID that the Yubikey encrypts in the OTP
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	81 key The AES key that the Yubikey uses (may be blank if a global shared key is used, see below)
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	82
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	83 If a password is configured for the user (recommended) they must enter
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	84 this into the password box immediately before the OTP. This password
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	85 doesn't have to be incredibly long or secure, but it prevents the
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	86 Yubikey being used for authentication if it is stolen and the password
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	87 isn't known.
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	88
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	89 Configuring Prosody
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	90 -------------------
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	91
29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	92 To use this module for authentication, set in the config:
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	93
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	94 authentication = "internal_yubikey"
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	95
29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	96 Module-specific options:
29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	97
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	98 yubikey\_prefix\_length (REQUIRED) The length of the public ID prefixed to the OTPs
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	99 ------------------------- -------------------------------------------------------------------------------------------------------------------
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	100 yubikey\_global\_key If all Yubikeys use the same AES key, you can specify it here. Pass --key="" to prosodyctl when associating keys.
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	101
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	102 If switching from a plaintext storage auth module then users without
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	103 Yubikeys associated with their account can continue to use their
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	104 existing passwords as normal, otherwise password resets are required.
1782 29f3d6b7ad16 Import wiki pages Kim Alvefur <zash@zash.se> parents: diff changeset	105
1803 4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	106 Compatibility
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	107 =============
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	108
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	109 ----- -------
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	110 0.8 Works
4d73a1a6ba68 Convert all wiki pages to Markdown Kim Alvefur <zash@zash.se> parents: 1782 diff changeset	111 ----- -------

Mercurial > prosody-modules

annotate mod_auth_internal_yubikey/README.markdown @ 5243:d5dc8edb2695