Mercurial > libervia-backend
annotate doc/libervia-cli/encryption.rst @ 3699:2dab494e56fc
plugin XEP-0264: replace `SIZE_FULL_SCREEN` by `SIZE_BIG`:
`SIZE_FULL_SCREEN` may result in large files, and BoB is currently used to transfer them,
resulting in potentially large stanza. As a result, Libervia profile can be disconnected
from server if stanza max size is reached.
As a temporary workaround, `SIZE_BIG` is now the maximum size used. This should be fixed
in 0.9 with a proper way to transfer large thumbnails (i.e. not BoB).
| author | Goffi <goffi@goffi.org> |
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| date | Fri, 05 Nov 2021 18:08:39 +0100 |
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1 ======================================== |
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2 encryption: encryption sessions handling |
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3 ======================================== |
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4 |
| 3505 | 5 Libervia being an XMPP client does encryption by default between client and server. In |
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6 addition, Libervia 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 |
| 3505 | 18 Display e2e encryption algorithms available in this instance of Libervia. |
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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 $ li 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 li 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 $ li 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, Libervia 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 |
| 3054 | 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 Libervia:: |
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76 |
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77 $ li 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 $ li 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 Libervia 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 $ li 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 |
| 3054 | 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 |
| 3054 | 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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126 $ li encryption trust ui -n omemo louise@example.org |