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author Matthew Wild <mwild1@gmail.com>
date Mon, 02 Jul 2018 12:56:19 +0100
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1 # mod_auth_token
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2
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3 This module enables Prosody to authenticate time-based one-time-pin (TOTP) HMAC tokens.
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4
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5 This is an alternative to "external authentication" which avoids the need to
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6 make a blocking HTTP call to the external authentication service (usually a web application backend).
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7
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8 Instead, the application generates the HMAC token, which is then sent to
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9 Prosody via the XMPP client and Prosody verifies the authenticity of this
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10 token.
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11
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12 If the token is verified, then the user is authenticated.
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13
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14 ## How to generate the token
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15
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16 You'll need a shared OTP_SEED value for generating time-based one-time-pin
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17 values and a shared private key for signing the HMAC token.
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18
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19 You can generate the OTP_SEED value with Python, like so:
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20
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21 >>> import pyotp
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22 >>> pyotp.random_base32()
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23 u'XVGR73KMZH2M4XMY'
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24
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25 and the shared secret key as follows:
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26
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27 >>> import pyotp
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28 >>> pyotp.random_base32(length=32)
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29 u'JYXEX4IQOEYFYQ2S3MC5P4ZT4SDHYEA7'
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30
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31 These values then need to go into your Prosody.cfg file:
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32
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33 token_secret = "JYXEX4IQOEYFYQ2S3MC5P4ZT4SDHYEA7"
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34 otp_seed = "XVGR73KMZH2M4XMY"
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35
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36 The application that generates the tokens also needs access to these values.
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37
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38 For an example on how to generate a token, take a look at the `generate_token`
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39 function in the `test_token_auth.lua` file inside this directory.
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40
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41 ## Custom SASL auth
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42
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43 This module depends on a custom SASL auth mechanism called X-TOKEN and which
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44 is provided by the file `mod_sasl_token.lua`.
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45
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46 Prosody doesn't automatically pick up this file, so you'll need to update your
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47 configuration file's `plugin_paths` to link to this subdirectory (for example
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48 to `/usr/lib/prosody-modules/mod_auth_token/`).