prosody-modules
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mod_client_certs/README.markdown

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mod_client_certs/README.markdown @ 5698:17ea26cf7259

mod_storage_s3: Use '@' as placeholder for empty (host) store slots Used when the server stores things for itself.
author Kim Alvefur <zash@zash.se>
date Sat, 14 Oct 2023 22:49:57 +0200
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1 ---
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2 labels:
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3 - 'Stage-Alpha'
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4 summary: 'Client-side certificate management for Prosody'
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5 ...
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6
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7 Introduction
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8 ============
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9
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10 [XEP-0257](http://xmpp.org/extensions/xep-0257.html) specifies a
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11 protocol for clients to store and manage client side certificates. When
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12 a client presents a stored client side certificate during the TLS
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13 handshake, it can log in without supplying a password (using SASL
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14 EXTERNAL). This makes it possible to have multiple devices accessing an
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15 account, without any of them needing to know the password, and makes it
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16 easier to revoke access for a single device.
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17
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18 Details
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19 =======
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20
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21 Each user can add their own certificates. These do not need to be signed
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22 by a trusted CA, yet they do need to be valid at the time of logging in
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23 and they should include an subjectAltName with otherName
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24 "id-on-xmppAddr" with the JID of the user.
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25
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26 Generating your certificate
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27 ---------------------------
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28
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29 1. To generate your own certificate with a "id-on-xmppAddr" attribute
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30 using the command line `openssl` tool, first create a file called
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31 `client.cnf` with contents:
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32
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33 [req] prompt = no
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34 x509_extensions = v3_extensions
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35 req_extensions = v3_extensions
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36 distinguished_name = distinguished_name
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37
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38 [v3_extensions]
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39 extendedKeyUsage = clientAuth
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40 keyUsage = digitalSignature,keyEncipherment
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41 basicConstraints = CA:FALSE
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42 subjectAltName = @subject_alternative_name
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43
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44 [subject_alternative_name]
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45 otherName.0 =
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46 1.3.6.1.5.5.7.8.5;FORMAT:UTF8,UTF8:hamlet@shakespeare.lit
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47
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48 [distinguished_name]
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49 commonName = Your Name
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50 emailAddress = hamlet@shakespeare.lit
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51
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52 2. Replace the values for `otherName.0` and `commonName` and
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53 `emailAddress` with your own values. The JID in `otherName.0` can
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54 either be a full JID or a bare JID, in the former case, the client
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55 can only use the resource specified in the resource. There are many
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56 other fields you can add, however, for SASL EXTERNAL, they will have
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57 no meaning. You can add more JIDs as `otherName.1`, `otherName.2`,
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58 etc.
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59 3. Create a private key (as an example, a 4096 bits RSA key):
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60
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61 openssl genrsa -out client.key 4096
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62
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63 4. Create the certificate request:
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64
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65 openssl req -key client.key -new -out client.req -config client.cnf -extensions v3_extensions
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66
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67 5. Sign it yourself:
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68
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69 openssl x509 -req -days 365 -in client.req -signkey client.key -out client.crt -extfile client.cnf -extensions v3_extensions
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70
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71 The 365 means the certificate will be valid for a year starting now.
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72
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73 The `client.key` **must** be kept secret, and is only needed by clients
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74 connecting using this certificate. The `client.crt` file contains the
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75 certificate that should be sent to the server using XEP-0257, and is
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76 also needed by clients connecting to the server. The `client.req` file
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77 is not needed anymore.
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78
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79 Configuration
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80 =============
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81
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82 (None yet)
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83
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84 Compatibility
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85 =============
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86
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87 ----- -----------------------------
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88 0.9 Works
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89 0.8 Untested. Probably doesn't.
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90 ----- -----------------------------
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91
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92 Clients
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93 =======
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94
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95 (None?)
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96
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97 TODO
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98 ====
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99
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100 Possible options to add to the configuration:
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101
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102 - Require certificates to be signed by a trusted CA.
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103 - Do not require a id-on-xmppAddr
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104 - Remove expired certs after a certain time
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105 - Limit the number of certificates per user