prosody-modules: mod_auth_token/README.markdown annotate

annotate mod_auth_token/README.markdown @ 4651:8231774f5bfd

mod_cloud_notify_encrypted: Ensure body substring remains valid UTF-8 The `body:sub()` call risks splitting the string in the middle of a multi-byte UTF-8 sequence. This should have been caught by util.stanza validation, but that would have caused some havoc, at the very least causing the notification to not be sent. There have been no reports of this happening. Likely because this module isn't widely deployed among users with languages that use many longer UTF-8 sequences. The util.encodings.utf8.valid() function is O(n) where only the last sequence really needs to be checked, but it's in C and expected to be fast.

author	Kim Alvefur <zash@zash.se>
date	Sun, 22 Aug 2021 13:22:59 +0200
parents	b4bcb84997e7
children

rev	line source
2956 d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	1 # mod_auth_token
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	2
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	3 This module enables Prosody to authenticate time-based one-time-pin (TOTP) HMAC tokens.
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	4
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	5 This is an alternative to "external authentication" which avoids the need to
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	6 make a blocking HTTP call to the external authentication service (usually a web application backend).
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	7
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	8 Instead, the application generates the HMAC token, which is then sent to
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	9 Prosody via the XMPP client and Prosody verifies the authenticity of this
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	10 token.
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	11
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	12 If the token is verified, then the user is authenticated.
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	13
3471 b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	14 ## Luarocks dependencies
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	15
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	16 You'll need to install the following luarocks
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	17
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	18 otp 0.1-5
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	19 luatz 0.3-1
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	20
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	21 ## How to generate the TOTP seed and shared signing secret
2956 d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	22
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	23 You'll need a shared OTP_SEED value for generating time-based one-time-pin
3471 b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	24 (TOTP) values and a shared private key for signing the HMAC token.
2956 d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	25
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	26 You can generate the OTP_SEED value with Python, like so:
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	27
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	28 >>> import pyotp
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	29 >>> pyotp.random_base32()
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	30 u'XVGR73KMZH2M4XMY'
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	31
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	32 and the shared secret key as follows:
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	33
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	34 >>> import pyotp
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	35 >>> pyotp.random_base32(length=32)
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	36 u'JYXEX4IQOEYFYQ2S3MC5P4ZT4SDHYEA7'
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	37
3471 b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	38 ## Configuration
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	39
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	40 Firest you need to enable the relevant modules to your Prosody.cfg file.
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	41
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	42 Look for the line `modules_enabled` (either globally or for your
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	43 particular `VirtualHost`), and then add the following to tokens:
2956 d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	44
3471 b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	45 modules_enabled = {
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	46 -- Token authentication
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	47 "auth_token";
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	48 "sasl_token";
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	49 }
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	50
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	51 The previously generated token values also need to go into your Prosody.cfg file:
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	52
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	53 authentication = "token";
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	54 token_secret = "JYXEX4IQOEYFYQ2S3MC5P4ZT4SDHYEA7";
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	55 otp_seed = "XVGR73KMZH2M4XMY";
2956 d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	56
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	57 The application that generates the tokens also needs access to these values.
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	58
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	59 For an example on how to generate a token, take a look at the `generate_token`
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	60 function in the `test_token_auth.lua` file inside this directory.
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	61
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	62 ## Custom SASL auth
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	63
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	64 This module depends on a custom SASL auth mechanism called X-TOKEN and which
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	65 is provided by the file `mod_sasl_token.lua`.
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	66
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	67 Prosody doesn't automatically pick up this file, so you'll need to update your
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	68 configuration file's `plugin_paths` to link to this subdirectory (for example
d0ca211e1b0e New HMAC token authentication module for Prosody. JC Brand <jc@opkode.com> parents: diff changeset	69 to `/usr/lib/prosody-modules/mod_auth_token/`).
3471 b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	70
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	71 ## Generating the token
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	72
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	73 Here's a Python snippet showing how you can generate the token that Prosody
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	74 will then verify:
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	75
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	76 import base64
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	77 import pyotp
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	78 import random
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	79
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	80 # Constants
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	81 OTP_INTERVAL = 30
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	82 OTP_DIGITS = 8
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	83
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	84 jid = '{}@{}'.format(username, domain)
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	85
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	86 otp_service = pyotp.TOTP(
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	87 OTP_SEED, # OTP_SEED must be set to the value generated previously (see above)
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	88 digits=OTP_DIGITS,
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	89 interval=OTP_INTERVAL
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	90 )
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	91 otp = otp_service.generate_otp(otp_service.timecode(datetime.utcnow()))
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	92
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	93 nonce = ''.join([str(random.randint(0, 9)) for i in range(32)])
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	94 string_to_sign = otp + nonce + jid
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	95 signature = hmac.new(token_secret, string_to_sign, hashlib.sha256).digest()
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	96 token = u"{} {}".format(otp+nonce, base64.b64encode(signature))
b4bcb84997e7 mod_auth_token: Update README. JC Brand <jc@opkode.com> parents: 2960 diff changeset	97

Mercurial > prosody-modules

annotate mod_auth_token/README.markdown @ 4651:8231774f5bfd