5 title: "Permission model"
11 Each API transaction (read, write, create, etc.) is done on behalf of a person.
13 * An end user, via a web app
14 * The owner of an installed app
16 A user (person) is permitted to act on an object if there is a path (series of permission Links) from the acting user to the object in which
18 * Every intervening object is a Group, and
19 * Every intervening permission Link allows the current action
21 Special case: A permission path can also include intervening User objects if the links _to_ the Users are "can_manage" links.
23 Each object has exactly one _owner_, which can be either a User or a Group.
25 * If the owner of X is A, then A is permitted to do any action on X.
29 An authorization token is issued at a user's request, and supplied to an API client using some suitable mechanism (_e.g._, cookie or application config file for a web app; environment variable or .rc-file for a CLI app).
31 A user can have multiple valid tokens at a given time. At the user's option, a token can be restricted to a combination of
37 h3. System pseudo-user
39 A privileged user account exists for the use of built-in Arvados system components. This user manages system-wide shared objects which can't really be "owned" by any particular user, like
41 * Jobs and job steps (because a given job can be "wanted" by multiple users)
42 * Provenance metadata (because no user should be able to modify this directly)
43 * Storage metadata like
44 ** redundancy verified as N× at time Y
45 ** contents of collections A and B are identical
47 The system pseudo-user's uuid is @{siteprefix}-tpzed-000000000000000@.
51 h3. 1. Private objects
53 Alfred stores 3 data Collections in Keep and adds them to a new Group.
55 The Collections and the Group can only be seen by Alfred, administrators, and the system user.
57 The data in the Collections can only be retrieved by Alfred, administrators, and the system user.
61 George creates a "PGP public data" Group, and grants "read" permission to all users.
63 * ...by adding a Link: "All users" Group _can_read_→ "PGP public data" Group
65 George stores 4 data Collections in Keep and adds them to the "PGP public data" Group
67 * ...by adding a Link: Group _can_read_→ Collection
69 Anyone who can connect to Arvados can log in with a Google/OpenID account and read the data.
71 h3. 3. Group-managed objects
73 Three lab members are working together on a project. All Specimens, Links, Jobs, etc. can be modified by any of the three lab members. _Other_ lab members, who are not working on this project, can view but not modify these objects.
75 h3. 4. Group-level administrator
77 The Ashton Lab administrator, Alison, manages user accounts within her lab. She can enable and disable accounts, and exercise any permission that her lab members have.
79 George has read-only access to the same set of accounts. This lets him see things like user activity and resource usage reports, without worrying about accidentally messing up anyone's data.
81 table(table table-bordered table-condensed).
82 |Tail |Permission |Head |Effect|
83 |Group: Ashton Lab Admin|can_manage |User: Lab Member 1 |Lab member 1 is in this administrative group|
84 |Group: Ashton Lab Admin|can_manage |User: Lab Member 2 |Lab member 2 is in this administrative group|
85 |Group: Ashton Lab Admin|can_manage |User: Lab Member 3 |Lab member 3 is in this administrative group|
86 |Group: Ashton Lab Admin|can_manage |User: Alison |Alison is in this administrative group|
87 |Group: Ashton Lab Admin|can_manage |User: George |George is in this administrative group|
88 |Alison |can_manage |Group: Ashton Lab Admin |Alison can do everything the above lab members can do|
89 |George |can_read |Group: Ashton Lab Admin |George can read everything the above lab members can read|
91 h3. 5. Segregated roles
93 Granwyth, at the Hulatberi Lab, sets up a Factory Robot which uses a hosted Arvados site to do work for the Hulatberi Lab.
95 Frank uploads a data Collection using Factory Robot's upload interface. Factory Robot sets data owner to Hulatberi Lab.
97 Factory Robot processes the data using a pipeline.
99 Factory Robot grants permission for anyone in the Ingeborg Lab (a Hulateberi Lab customer) to read the output of the pipeline, as well as the pipeline invocation details. (Say, Ingeborg and Jill.)
101 During and after processing, all members of the Hulatberi Lab (_e.g._, Mike) can inspect pipeline progress, read source/intermediate/output data, and modify objects.
105 table(table table-bordered table-condensed).
106 |Tail |Permission |Head |Effect|
107 |Frank |(none) | |Factory Robot uses only its own credentials during upload|
108 |Granwyth |can_manage |User: Factory Robot |can revoke tokens, view activity... (needed?)|
109 |Granwyth |can_manage |Group: Hulatberi Lab |can grant group-write permission to Factory Robot|
110 |Factory Robot |can_write |Group: Hulatberi Lab |can add data, pipelines, jobs, etc. to the Lab group|
111 |Mike |can_write |Group: Hulatberi Lab |can edit/annotate/delete objects that belong to the Lab|
113 h3. Actions governed by permissions
115 table(table table-bordered table-condensed).
116 |_Action_|_Permissions needed_|
117 |Retrieve data from Keep|can_read (system-wide?)|
118 |Store data in Keep|can_write (system-wide?)|
119 |Add a Collection to Arvados|can_write (system-wide?)|
120 |Run a job|can_run (system-wide?)|
121 |See progress/result of a job|can_read (on job)|
122 |Give group permissions to a user/group|can_manage (on group)|
123 |Revoke group permissions from a user/group|can_manage (on group)|
124 |Change owner of an object|can_manage (on object)|
125 |Add an object to a group|can_write (on group)|