prosody
2167e1639aab
plugins/mod_authz_internal.lua

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plugins/mod_authz_internal.lua @ 12733:2167e1639aab

mod_authz_internal: Allow specifying default role for public (remote) users
author Matthew Wild <mwild1@gmail.com>
date Thu, 29 Sep 2022 12:46:02 +0100
parent 12730:427dd01f0864
child 12740:f58c6ae5edc1
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rev   line source
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1 local array = require "util.array";
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2 local it = require "util.iterators";
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3 local set = require "util.set";
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4 local jid_split, jid_bare, jid_host = import("util.jid", "split", "bare", "host");
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5 local normalize = require "util.jid".prep;
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6 local roles = require "util.roles";
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7
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8 local config_global_admin_jids = module:context("*"):get_option_set("admins", {}) / normalize;
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9 local config_admin_jids = module:get_option_inherited_set("admins", {}) / normalize;
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10 local host = module.host;
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11 local host_suffix = host:gsub("^[^%.]+%.", "");
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12
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13 local hosts = prosody.hosts;
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14 local is_component = hosts[host].type == "component";
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15 local host_user_role, server_user_role;
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16 if is_component then
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17 host_user_role = module:get_option_string("host_user_role", "prosody:user");
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18 server_user_role = module:get_option_string("server_user_role");
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19 public_user_role = module:get_option_string("public_user_role");
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20 end
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21
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22 local role_store = module:open_store("account_roles");
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23 local role_map_store = module:open_store("account_roles", "map");
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24
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25 local role_registry = {};
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26
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27 function register_role(role)
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28 if role_registry[role.name] ~= nil then
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29 return error("A role '"..role.name.."' is already registered");
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30 end
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31 if not roles.is_role(role) then
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32 -- Convert table syntax to real role object
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33 for i, inherited_role in ipairs(role.inherits or {}) do
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34 if type(inherited_role) == "string" then
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35 role.inherits[i] = assert(role_registry[inherited_role], "The named role '"..inherited_role.."' is not registered");
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36 end
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37 end
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38 if not role.permissions then role.permissions = {}; end
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39 for _, allow_permission in ipairs(role.allow or {}) do
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40 role.permissions[allow_permission] = true;
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41 end
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42 for _, deny_permission in ipairs(role.deny or {}) do
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43 role.permissions[deny_permission] = false;
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44 end
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45 role = roles.new(role);
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46 end
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47 role_registry[role.name] = role;
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48 end
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49
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50 -- Default roles
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51 register_role {
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52 name = "prosody:restricted";
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53 priority = 15;
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54 };
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55
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56 register_role {
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57 name = "prosody:user";
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58 priority = 25;
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59 inherits = { "prosody:restricted" };
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60 };
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61
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62 register_role {
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63 name = "prosody:admin";
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64 priority = 50;
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65 inherits = { "prosody:user" };
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66 };
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67
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68 register_role {
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69 name = "prosody:operator";
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70 priority = 75;
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71 inherits = { "prosody:admin" };
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72 };
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73
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74
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75 -- Process custom roles from config
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76
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77 local custom_roles = module:get_option("custom_roles", {});
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78 for n, role_config in ipairs(custom_roles) do
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79 local ok, err = pcall(register_role, role_config);
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80 if not ok then
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81 module:log("error", "Error registering custom role %s: %s", role_config.name or tostring(n), err);
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82 end
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83 end
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84
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85 -- Process custom permissions from config
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86
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87 local config_add_perms = module:get_option("add_permissions", {});
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88 local config_remove_perms = module:get_option("remove_permissions", {});
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89
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90 for role_name, added_permissions in pairs(config_add_perms) do
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91 if not role_registry[role_name] then
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92 module:log("error", "Cannot add permissions to unknown role '%s'", role_name);
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93 else
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94 for _, permission in ipairs(added_permissions) do
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95 role_registry[role_name]:set_permission(permission, true, true);
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96 end
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97 end
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98 end
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99
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100 for role_name, removed_permissions in pairs(config_remove_perms) do
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101 if not role_registry[role_name] then
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102 module:log("error", "Cannot remove permissions from unknown role '%s'", role_name);
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103 else
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104 for _, permission in ipairs(removed_permissions) do
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105 role_registry[role_name]:set_permission(permission, false, true);
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106 end
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107 end
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108 end
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109
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110 -- Public API
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111
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112 -- Get the primary role of a user
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113 function get_user_role(user)
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114 local bare_jid = user.."@"..host;
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115
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116 -- Check config first
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117 if config_global_admin_jids:contains(bare_jid) then
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118 return role_registry["prosody:operator"];
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119 elseif config_admin_jids:contains(bare_jid) then
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120 return role_registry["prosody:admin"];
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121 end
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122
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123 -- Check storage
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124 local stored_roles, err = role_store:get(user);
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125 if not stored_roles then
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parents: 12648
diff changeset
126 if err then
07424992d7fc mod_authz_internal, and more: New iteration of role API
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parents: 12648
diff changeset
127 -- Unable to fetch role, fail
07424992d7fc mod_authz_internal, and more: New iteration of role API
Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
128 return nil, err;
07424992d7fc mod_authz_internal, and more: New iteration of role API
Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
129 end
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diff changeset
130 -- No role set, use default role
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diff changeset
131 return role_registry["prosody:user"];
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diff changeset
132 end
12662
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diff changeset
133 if stored_roles._default == nil then
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diff changeset
134 -- No primary role explicitly set, return default
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parents: 12648
diff changeset
135 return role_registry["prosody:user"];
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parents: 12648
diff changeset
136 end
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diff changeset
137 local primary_stored_role = role_registry[stored_roles._default];
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parents: 12648
diff changeset
138 if not primary_stored_role then
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parents: 12648
diff changeset
139 return nil, "unknown-role";
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parents: 12648
diff changeset
140 end
07424992d7fc mod_authz_internal, and more: New iteration of role API
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diff changeset
141 return primary_stored_role;
10659
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parents:
diff changeset
142 end
8f95308c3c45 usermanager, mod_authz_*: Merge mod_authz_config and mod_authz_internal into the latter
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parents:
diff changeset
143
12662
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diff changeset
144 -- Set the primary role of a user
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parents: 12648
diff changeset
145 function set_user_role(user, role_name)
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Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
146 local role = role_registry[role_name];
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diff changeset
147 if not role then
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parents: 12648
diff changeset
148 return error("Cannot assign default user an unknown role: "..tostring(role_name));
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parents: 12648
diff changeset
149 end
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Matthew Wild <mwild1@gmail.com>
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diff changeset
150 local keys_update = {
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diff changeset
151 _default = role_name;
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152 -- Primary role cannot be secondary role
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diff changeset
153 [role_name] = role_map_store.remove;
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Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
154 };
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Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
155 if role_name == "prosody:user" then
07424992d7fc mod_authz_internal, and more: New iteration of role API
Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
156 -- Don't store default
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parents: 12648
diff changeset
157 keys_update._default = role_map_store.remove;
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parents: 12648
diff changeset
158 end
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parents: 12648
diff changeset
159 local ok, err = role_map_store:set_keys(user, keys_update);
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Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
160 if not ok then
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parents: 12648
diff changeset
161 return nil, err;
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parents: 12648
diff changeset
162 end
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parents: 12648
diff changeset
163 return role;
07424992d7fc mod_authz_internal, and more: New iteration of role API
Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
164 end
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Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
165
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Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
166 function add_user_secondary_role(user, role_name)
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Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
167 if not role_registry[role_name] then
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parents: 12648
diff changeset
168 return error("Cannot assign default user an unknown role: "..tostring(role_name));
07424992d7fc mod_authz_internal, and more: New iteration of role API
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parents: 12648
diff changeset
169 end
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parents: 12648
diff changeset
170 role_map_store:set(user, role_name, true);
11472
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Jonas Schäfer <jonas@wielicki.name>
parents: 10659
diff changeset
171 end
c32753ceb0f0 mod_authz_internal: add support for setting roles of a local user
Jonas Schäfer <jonas@wielicki.name>
parents: 10659
diff changeset
172
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diff changeset
173 function remove_user_secondary_role(user, role_name)
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parents: 12648
diff changeset
174 role_map_store:set(user, role_name, nil);
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parents: 11745
diff changeset
175 end
9061f9621330 Switch to a new role-based authorization framework, removing is_admin()
Matthew Wild <mwild1@gmail.com>
parents: 11745
diff changeset
176
12662
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diff changeset
177 function get_user_secondary_roles(user)
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parents: 12648
diff changeset
178 local stored_roles, err = role_store:get(user);
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parents: 12648
diff changeset
179 if not stored_roles then
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parents: 12648
diff changeset
180 if err then
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parents: 12648
diff changeset
181 -- Unable to fetch role, fail
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parents: 12648
diff changeset
182 return nil, err;
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parents: 12648
diff changeset
183 end
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Matthew Wild <mwild1@gmail.com>
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diff changeset
184 -- No role set
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diff changeset
185 return {};
07424992d7fc mod_authz_internal, and more: New iteration of role API
Matthew Wild <mwild1@gmail.com>
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diff changeset
186 end
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Matthew Wild <mwild1@gmail.com>
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diff changeset
187 stored_roles._default = nil;
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Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
188 for role_name in pairs(stored_roles) do
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parents: 12648
diff changeset
189 stored_roles[role_name] = role_registry[role_name];
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Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
190 end
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Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
191 return stored_roles;
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Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
192 end
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Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
193
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parents: 12662
diff changeset
194 function user_can_assume_role(user, role_name)
cf88f6b03942 mod_authz_internal: Expose convenience method to test if user can assume role
Matthew Wild <mwild1@gmail.com>
parents: 12662
diff changeset
195 local primary_role = get_user_role(user);
cf88f6b03942 mod_authz_internal: Expose convenience method to test if user can assume role
Matthew Wild <mwild1@gmail.com>
parents: 12662
diff changeset
196 if primary_role and primary_role.role_name == role_name then
cf88f6b03942 mod_authz_internal: Expose convenience method to test if user can assume role
Matthew Wild <mwild1@gmail.com>
parents: 12662
diff changeset
197 return true;
cf88f6b03942 mod_authz_internal: Expose convenience method to test if user can assume role
Matthew Wild <mwild1@gmail.com>
parents: 12662
diff changeset
198 end
cf88f6b03942 mod_authz_internal: Expose convenience method to test if user can assume role
Matthew Wild <mwild1@gmail.com>
parents: 12662
diff changeset
199 local secondary_roles = get_user_secondary_roles(user);
cf88f6b03942 mod_authz_internal: Expose convenience method to test if user can assume role
Matthew Wild <mwild1@gmail.com>
parents: 12662
diff changeset
200 if secondary_roles and secondary_roles[role_name] then
cf88f6b03942 mod_authz_internal: Expose convenience method to test if user can assume role
Matthew Wild <mwild1@gmail.com>
parents: 12662
diff changeset
201 return true;
cf88f6b03942 mod_authz_internal: Expose convenience method to test if user can assume role
Matthew Wild <mwild1@gmail.com>
parents: 12662
diff changeset
202 end
cf88f6b03942 mod_authz_internal: Expose convenience method to test if user can assume role
Matthew Wild <mwild1@gmail.com>
parents: 12662
diff changeset
203 return false;
cf88f6b03942 mod_authz_internal: Expose convenience method to test if user can assume role
Matthew Wild <mwild1@gmail.com>
parents: 12662
diff changeset
204 end
cf88f6b03942 mod_authz_internal: Expose convenience method to test if user can assume role
Matthew Wild <mwild1@gmail.com>
parents: 12662
diff changeset
205
12662
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diff changeset
206 -- This function is *expensive*
12642
9061f9621330 Switch to a new role-based authorization framework, removing is_admin()
Matthew Wild <mwild1@gmail.com>
parents: 11745
diff changeset
207 function get_users_with_role(role_name)
12662
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parents: 12648
diff changeset
208 local function role_filter(username, default_role) --luacheck: ignore 212/username
07424992d7fc mod_authz_internal, and more: New iteration of role API
Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
209 return default_role == role_name;
07424992d7fc mod_authz_internal, and more: New iteration of role API
Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
210 end
07424992d7fc mod_authz_internal, and more: New iteration of role API
Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
211 local primary_role_users = set.new(it.to_array(it.filter(role_filter, pairs(role_map_store:get_all("_default") or {}))));
07424992d7fc mod_authz_internal, and more: New iteration of role API
Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
212 local secondary_role_users = set.new(it.to_array(it.keys(role_map_store:get_all(role_name) or {})));
07424992d7fc mod_authz_internal, and more: New iteration of role API
Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
213
12642
9061f9621330 Switch to a new role-based authorization framework, removing is_admin()
Matthew Wild <mwild1@gmail.com>
parents: 11745
diff changeset
214 local config_set;
9061f9621330 Switch to a new role-based authorization framework, removing is_admin()
Matthew Wild <mwild1@gmail.com>
parents: 11745
diff changeset
215 if role_name == "prosody:admin" then
9061f9621330 Switch to a new role-based authorization framework, removing is_admin()
Matthew Wild <mwild1@gmail.com>
parents: 11745
diff changeset
216 config_set = config_admin_jids;
9061f9621330 Switch to a new role-based authorization framework, removing is_admin()
Matthew Wild <mwild1@gmail.com>
parents: 11745
diff changeset
217 elseif role_name == "prosody:operator" then
9061f9621330 Switch to a new role-based authorization framework, removing is_admin()
Matthew Wild <mwild1@gmail.com>
parents: 11745
diff changeset
218 config_set = config_global_admin_jids;
9061f9621330 Switch to a new role-based authorization framework, removing is_admin()
Matthew Wild <mwild1@gmail.com>
parents: 11745
diff changeset
219 end
9061f9621330 Switch to a new role-based authorization framework, removing is_admin()
Matthew Wild <mwild1@gmail.com>
parents: 11745
diff changeset
220 if config_set then
9061f9621330 Switch to a new role-based authorization framework, removing is_admin()
Matthew Wild <mwild1@gmail.com>
parents: 11745
diff changeset
221 local config_admin_users = config_set / function (admin_jid)
11745
3a2d58a39872 usermanager, mod_authz_internal: Add methods to fetch users/JIDs of given role
Matthew Wild <mwild1@gmail.com>
parents: 11474
diff changeset
222 local j_node, j_host = jid_split(admin_jid);
3a2d58a39872 usermanager, mod_authz_internal: Add methods to fetch users/JIDs of given role
Matthew Wild <mwild1@gmail.com>
parents: 11474
diff changeset
223 if j_host == host then
3a2d58a39872 usermanager, mod_authz_internal: Add methods to fetch users/JIDs of given role
Matthew Wild <mwild1@gmail.com>
parents: 11474
diff changeset
224 return j_node;
3a2d58a39872 usermanager, mod_authz_internal: Add methods to fetch users/JIDs of given role
Matthew Wild <mwild1@gmail.com>
parents: 11474
diff changeset
225 end
3a2d58a39872 usermanager, mod_authz_internal: Add methods to fetch users/JIDs of given role
Matthew Wild <mwild1@gmail.com>
parents: 11474
diff changeset
226 end;
12662
07424992d7fc mod_authz_internal, and more: New iteration of role API
Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
227 return it.to_array(config_admin_users + primary_role_users + secondary_role_users);
11745
3a2d58a39872 usermanager, mod_authz_internal: Add methods to fetch users/JIDs of given role
Matthew Wild <mwild1@gmail.com>
parents: 11474
diff changeset
228 end
12662
07424992d7fc mod_authz_internal, and more: New iteration of role API
Matthew Wild <mwild1@gmail.com>
parents: 12648
diff changeset
229 return it.to_array(primary_role_users + secondary_role_users);
11745
3a2d58a39872 usermanager, mod_authz_internal: Add methods to fetch users/JIDs of given role
Matthew Wild <mwild1@gmail.com>
parents: 11474
diff changeset
230 end
3a2d58a39872 usermanager, mod_authz_internal: Add methods to fetch users/JIDs of given role
Matthew Wild <mwild1@gmail.com>
parents: 11474
diff changeset
231
12642
9061f9621330 Switch to a new role-based authorization framework, removing is_admin()
Matthew Wild <mwild1@gmail.com>
parents: 11745
diff changeset
232 function get_jid_role(jid)
9061f9621330 Switch to a new role-based authorization framework, removing is_admin()
Matthew Wild <mwild1@gmail.com>
parents: 11745
diff changeset
233 local bare_jid = jid_bare(jid);
9061f9621330 Switch to a new role-based authorization framework, removing is_admin()
Matthew Wild <mwild1@gmail.com>
parents: 11745
diff changeset
234 if config_global_admin_jids:contains(bare_jid) then
9061f9621330 Switch to a new role-based authorization framework, removing is_admin()
Matthew Wild <mwild1@gmail.com>
parents: 11745
diff changeset
235 return role_registry["prosody:operator"];
9061f9621330 Switch to a new role-based authorization framework, removing is_admin()
Matthew Wild <mwild1@gmail.com>
parents: 11745
diff changeset
236 elseif config_admin_jids:contains(bare_jid) then
9061f9621330 Switch to a new role-based authorization framework, removing is_admin()
Matthew Wild <mwild1@gmail.com>
parents: 11745
diff changeset
237 return role_registry["prosody:admin"];
12730
427dd01f0864 mod_authz_internal: Allow configuring role of local-server/parent-host users
Matthew Wild <mwild1@gmail.com>
parents: 12663
diff changeset
238 elseif is_component then
427dd01f0864 mod_authz_internal: Allow configuring role of local-server/parent-host users
Matthew Wild <mwild1@gmail.com>
parents: 12663
diff changeset
239 local user_host = jid_host(bare_jid);
427dd01f0864 mod_authz_internal: Allow configuring role of local-server/parent-host users
Matthew Wild <mwild1@gmail.com>
parents: 12663
diff changeset
240 if host_user_role and user_host == host_suffix then
427dd01f0864 mod_authz_internal: Allow configuring role of local-server/parent-host users
Matthew Wild <mwild1@gmail.com>
parents: 12663
diff changeset
241 return role_registry[host_user_role];
427dd01f0864 mod_authz_internal: Allow configuring role of local-server/parent-host users
Matthew Wild <mwild1@gmail.com>
parents: 12663
diff changeset
242 elseif server_user_role and hosts[user_host] then
427dd01f0864 mod_authz_internal: Allow configuring role of local-server/parent-host users
Matthew Wild <mwild1@gmail.com>
parents: 12663
diff changeset
243 return role_registry[server_user_role];
12733
2167e1639aab mod_authz_internal: Allow specifying default role for public (remote) users
Matthew Wild <mwild1@gmail.com>
parents: 12730
diff changeset
244 elseif public_user_role then
2167e1639aab mod_authz_internal: Allow specifying default role for public (remote) users
Matthew Wild <mwild1@gmail.com>
parents: 12730
diff changeset
245 return role_registry[public_user_role];
12730
427dd01f0864 mod_authz_internal: Allow configuring role of local-server/parent-host users
Matthew Wild <mwild1@gmail.com>
parents: 12663
diff changeset
246 end
10659
8f95308c3c45 usermanager, mod_authz_*: Merge mod_authz_config and mod_authz_internal into the latter
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
247 end
8f95308c3c45 usermanager, mod_authz_*: Merge mod_authz_config and mod_authz_internal into the latter
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
248 return nil;
8f95308c3c45 usermanager, mod_authz_*: Merge mod_authz_config and mod_authz_internal into the latter
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
249 end
8f95308c3c45 usermanager, mod_authz_*: Merge mod_authz_config and mod_authz_internal into the latter
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
250
12648
f299e570a0fe mod_authz_internal: Use util.roles, some API changes and config support
Matthew Wild <mwild1@gmail.com>
parents: 12642
diff changeset
251 function set_jid_role(jid, role_name) -- luacheck: ignore 212
11472
c32753ceb0f0 mod_authz_internal: add support for setting roles of a local user
Jonas Schäfer <jonas@wielicki.name>
parents: 10659
diff changeset
252 return false;
c32753ceb0f0 mod_authz_internal: add support for setting roles of a local user
Jonas Schäfer <jonas@wielicki.name>
parents: 10659
diff changeset
253 end
11745
3a2d58a39872 usermanager, mod_authz_internal: Add methods to fetch users/JIDs of given role
Matthew Wild <mwild1@gmail.com>
parents: 11474
diff changeset
254
12642
9061f9621330 Switch to a new role-based authorization framework, removing is_admin()
Matthew Wild <mwild1@gmail.com>
parents: 11745
diff changeset
255 function get_jids_with_role(role_name)
11745
3a2d58a39872 usermanager, mod_authz_internal: Add methods to fetch users/JIDs of given role
Matthew Wild <mwild1@gmail.com>
parents: 11474
diff changeset
256 -- Fetch role users from storage
12642
9061f9621330 Switch to a new role-based authorization framework, removing is_admin()
Matthew Wild <mwild1@gmail.com>
parents: 11745
diff changeset
257 local storage_role_jids = array.map(get_users_with_role(role_name), function (username)
11745
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258 return username.."@"..host;
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259 end);
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260 if role_name == "prosody:admin" then
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261 return it.to_array(config_admin_jids + set.new(storage_role_jids));
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262 elseif role_name == "prosody:operator" then
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263 return it.to_array(config_global_admin_jids + set.new(storage_role_jids));
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264 end
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265 return storage_role_jids;
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266 end
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267
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268 function add_default_permission(role_name, action, policy)
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269 local role = role_registry[role_name];
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270 if not role then
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271 module:log("warn", "Attempt to add default permission for unknown role: %s", role_name);
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272 return nil, "no-such-role";
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273 end
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274 if policy == nil then policy = true; end
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275 module:log("debug", "Adding policy %s for permission %s on role %s", policy, action, role_name);
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276 return role:set_permission(action, policy);
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277 end
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278
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279 function get_role_by_name(role_name)
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280 return assert(role_registry[role_name], role_name);
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281 end
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282
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283 -- COMPAT: Migrate from 0.12 role storage
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284 local function do_migration(migrate_host)
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285 local old_role_store = assert(module:context(migrate_host):open_store("roles"));
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286 local new_role_store = assert(module:context(migrate_host):open_store("account_roles"));
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287
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288 local migrated, failed, skipped = 0, 0, 0;
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289 -- Iterate all users
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290 for username in assert(old_role_store:users()) do
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291 local old_roles = it.to_array(it.filter(function (k) return k:sub(1,1) ~= "_"; end, it.keys(old_role_store:get(username))));
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292 if #old_roles == 1 then
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293 local ok, err = new_role_store:set(username, {
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294 _default = old_roles[1];
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295 });
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296 if ok then
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297 migrated = migrated + 1;
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298 else
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299 failed = failed + 1;
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300 print("EE: Failed to store new role info for '"..username.."': "..err);
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301 end
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302 else
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303 print("WW: User '"..username.."' has multiple roles and cannot be automatically migrated");
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304 skipped = skipped + 1;
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305 end
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306 end
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307 return migrated, failed, skipped;
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308 end
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309
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310 function module.command(arg)
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311 if arg[1] == "migrate" then
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312 table.remove(arg, 1);
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313 local migrate_host = arg[1];
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314 if not migrate_host or not prosody.hosts[migrate_host] then
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315 print("EE: Please supply a valid host to migrate to the new role storage");
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316 return 1;
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317 end
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318
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319 -- Initialize storage layer
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320 require "core.storagemanager".initialize_host(migrate_host);
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321
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322 print("II: Migrating roles...");
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323 local migrated, failed, skipped = do_migration(migrate_host);
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324 print(("II: %d migrated, %d failed, %d skipped"):format(migrated, failed, skipped));
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325 return (failed + skipped == 0) and 0 or 1;
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326 else
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327 print("EE: Unknown command: "..(arg[1] or "<none given>"));
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328 print(" Hint: try 'migrate'?");
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329 end
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330 end