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mod_auth_internal_yubikey/README.markdown

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mod_auth_internal_yubikey/README.markdown @ 3827:7d909976ca88

mod_rest: Describe kind and type fields
author Kim Alvefur <zash@zash.se>
date Thu, 02 Jan 2020 10:45:14 +0100
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1 ---
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2 labels:
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3 - 'Stage-Beta'
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4 - 'Type-Auth'
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5 summary: 'Two-factor authentication using Yubikeys'
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6 ...
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7
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8 Introduction
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9 ============
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11 A [YubiKey](http://www.yubico.com/yubikey) is a small USB
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12 one-time-password (OTP) generator.
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14 The idea behind one-time-passwords is that they can, well, only be used
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15 once. After authenticating with an OTP the only way to log in again is
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16 to calculate another one and use that. The only (practical) way to
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17 generate this is by inserting the (correct) Yubikey and pressing its
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18 button. Acting as a USB keyboard it then "types" the OTP into the
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19 password prompt of your XMPP client.
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21 Details
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22 =======
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23
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24 This self-contained module handles all the authentication of Yubikeys,
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25 it does not for example depend on the Yubico authentication service, or
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26 on any external system service such as PAM.
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28 When this module is enabled, only PLAIN authentication is enabled on the
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29 server (because Prosody needs to receive the full password from the
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30 client to decode it, not a hash), so connection encryption will
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31 automatically be enforced by Prosody.
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32
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33 Even if the password is intercepted it is of little use to the attacker
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34 as it expires as soon as it is used. Additionally the data stored in
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35 Prosody's DB is not enough to authenticate as the user if stolen by the
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36 attacker.
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37
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38 When this module is in use each user can either use normal password
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39 authentication, or instead have their account associated with a
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40 Yubikey - at which point only the key will work.
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41
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42 Installation
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43 ============
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44
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45 Requires bitlib for Lua, and yubikey-lua from
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46 http://code.matthewwild.co.uk/yubikey-lua . When properly installed, the
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47 command `lua -lbit -lyubikey` should give you a Lua prompt with no
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48 errors.
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49
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50 Configuration
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51 =============
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52
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53 Associating keys
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54 ----------------
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55
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56 Each Yubikey is configured with several pieces of information that
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57 Prosody needs to know. This information is shown in the Yubikey
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58 personalization tool (the *yubikey-personalization* package in
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59 Debian/Ubuntu).
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60
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61 To associate a Yubikey with a user, run the following prosodyctl
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62 command:
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63
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64 prosodyctl mod_auth_internal_yubikey associate user@example.com
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65
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66 This will run you through a series of questions about the information
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67 Prosody requires about the key configuration.
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68
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69 **NOTE:** All keys used with the server (rather, with a given host) must
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70 all have a "public ID" (uid) of the same length. This length must be set
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71 in the Prosody config with the 'yubikey\_prefix\_length' option.
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72
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73 Instead of entering the information interactively it is also possible to
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74 specify each option on the command-line (useful for automation)
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75 via --option="value". The valid options are:
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76
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77 password The user's password (may be blank)
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78 ---------- --------------------------------------------------------------------------------------------
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79 fixed The public ID that the Yubikey prefixes to the OTP
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80 uid The private ID that the Yubikey encrypts in the OTP
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81 key The AES key that the Yubikey uses (may be blank if a global shared key is used, see below)
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82
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83 If a password is configured for the user (recommended) they must enter
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84 this into the password box immediately before the OTP. This password
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85 doesn't have to be incredibly long or secure, but it prevents the
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86 Yubikey being used for authentication if it is stolen and the password
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87 isn't known.
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88
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89 Configuring Prosody
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90 -------------------
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91
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92 To use this module for authentication, set in the config:
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93
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94 authentication = "internal_yubikey"
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95
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96 Module-specific options:
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97
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98 yubikey\_prefix\_length (**REQUIRED**) The length of the public ID prefixed to the OTPs
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99 ------------------------- -------------------------------------------------------------------------------------------------------------------
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100 yubikey\_global\_key If all Yubikeys use the same AES key, you can specify it here. Pass --key="" to prosodyctl when associating keys.
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101
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102 If switching from a plaintext storage auth module then users without
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103 Yubikeys associated with their account can continue to use their
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104 existing passwords as normal, otherwise password resets are required.
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105
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106 Compatibility
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107 =============
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108
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109 ----- -------
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110 0.8 Works
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111 ----- -------