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annotate doc/jp/encryption.rst @ 3410:55f9a38864af

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jp (file/receive): display or answer to C.META_TYPE_NOT_IN_ROSTER_LEAK dialog: when a file is proposed by an entity not in roster, the dialog asking for confirmation is displayed. If the bare jid of the sender is explicitely waited (i.e. it's in arguments), then the dialog is automatically confirmed.
author Goffi <goffi@goffi.org>
date Thu, 12 Nov 2020 14:53:16 +0100
parents 92f8baec5e4f
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ========================================
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2 encryption: encryption sessions handling
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3 ========================================
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4
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5 Salut à Toi being an XMPP client does encryption by default between client and server. In
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6 addition, SàT is also capable of doing end-to-end (e2e) encryption, meaning that the
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7 payload of messages are encrypted to be hidden from the servers (and their
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8 administrators). The ``encryption`` commands are here to handle those e2e encryption
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9 sessions and algorithms.
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10
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11 .. note::
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12
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13 For the moment, only one 2 one chat messages can be e2e encrypted
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14
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15 algorithms
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16 ==========
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17
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18 Display e2e encryption algorithms available in this instance of Salut à Toi.
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19
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20 example
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21 -------
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22
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23 Show available e2e algorithms::
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24
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25 $ jp encryption algorithms
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26
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27 get
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28 ===
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29
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30 Display which encryption session is currently active with the given entity.
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31
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32 The only required argument is the JID of the entity.
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33
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34 If not e2e encryption session exist, a message will be displayed and jp will exit with a
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35 non zero code: this means that the messages are in clear in the XMPP servers, but normal
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36 XMPP encryption is not affected (message should still be encrypted between client and
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37 server and between servers).
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38
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39 If an e2e encryption session exist, you'll see the algorithm name and its namespace. In
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40 case of e2e encryption which only works from device to device (e.g. it's the case with
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41 ``OTR`` which doesn't support multiple devices), you'll also see the resources of the
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42 devices where the encryption is active in ``directed_devices``
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43
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44 example
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45 -------
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46
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47 Check if session is encrypted with Louise::
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48
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49 $ jp encryption get louise@example.org
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50
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51 start
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52 =====
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53
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54 Start e2e session with an entity.
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55
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56 You need to specify the JID of the entity you want to start a session with as a positional
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57 argument.
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58
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59 By default, SàT will select itself the algorithm to use among those available, but you can
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60 specify one using either its name with ``-n NAME, --name NAME`` or its namespace using
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61 ``-N NAMESPACE, --namespace``. ``NAME`` is the short name of the algorithm, e.g. ``omemo``
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62 while the namespace is the longer (e.g. ``urn:xmpp:otr:0``).
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63
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64 If an encryption session is started but one with an other algorithm was already there, the
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65 original session will be stopped and replaced by one with the new requested algorithm. You
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66 can change this behaviour by using ``--encrypt-noreplace``: in this case the command will
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67 fail in case of conflict (e2e encryption is requested with a new algorithm while an e2e
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68 encryption session was already started with an other algorithm), and return a non-zero
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69 code. If an e2e encryption session was already started with the requested algorithm, the
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70 command will succeed in all cases and nothing will be changed.
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71
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72 examples
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73 --------
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74
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75 Start e2e encryption with Pierre, using the algorithm selected by SàT::
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76
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77 $ jp encryption start louise@example.net
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78
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79 Start an OMEMO session with Louise::
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80
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81 $ jp encryption start -n omemo louise@example.org
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82
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83 stop
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84 ====
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85
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86 Terminate an e2e session with given entity. The entity must be specified as positional
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87 argument.
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88
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89 After this command is run, the messages with specified entity will not be e2e encrypted
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90 anymore (but this won't affect encryption between SàT and XMPP server and between XMPP
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91 servers).
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92
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93 example
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94 -------
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95
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96 Stop the e2e encryption session with Pierre::
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97
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98 $ jp encryption stop pierre@example.net
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99
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100 trust ui
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101 ========
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102
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103 Run the user interface to handle trust with given entity and given algorithm. The user
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104 interface depends on the algorithm used, but it generally shows you the fingerprints
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105 associated with your contact or contact devices, and asks you if you trust them or not.
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106
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107 The only mandatory argument is the jid of your contact.
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108
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109 By default the currently active encryption session algorithm is used, but you may manage
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110 trust for another algorithm by using ``-n NAME, --name NAME`` or ``-N NAMESPACE,
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111 --namespace NAMESPACE``.
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112
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113 .. note::
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114
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115 Trusting a contact or a device means that you certify that this contact or device is
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116 the one you want to talk too. You should not trust a device if you have not verified by
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117 an external channel (i.e. not XMPP) the fingerprint. The best way is to verify the
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118 fingerprint physically if possible (i.e. in front of your contact, not with computer
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119 networks in the middle).
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120
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121 example
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122 -------
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123
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124 Manage ``OMEMO`` trust with Louise devices::
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125
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126 $ jp encryption trust ui -n omemo louise@example.org