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annotate mod_compat_roles/mod_compat_roles.lua @ 5678:0cffeff2cd1d

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mod_rest: Limit payload size (cf stanza size limits) Otherwise the limit would be defined by the HTTP stack.
author Kim Alvefur <zash@zash.se>
date Wed, 25 Oct 2023 15:36:20 +0200
parents 825c6fb76c48
children f8b9095f7862
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 -- Export a module:may() that works on Prosody 0.12 and earlier
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2 -- (i.e. backed by is_admin).
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3
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4 -- This API is safe because Prosody 0.12 and earlier do not support
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5 -- per-session roles - all authorization is based on JID alone. It is not
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6 -- safe on versions that support per-session authorization.
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7
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8 module:set_global();
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9
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10 local moduleapi = require "core.moduleapi";
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11
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12 -- If module.may already exists, abort
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13 if moduleapi.may then return; end
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14
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15 local jid_split = require "util.jid".split;
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16 local um_is_admin = require "core.usermanager".is_admin;
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17
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18 local function get_jid_role_name(jid, host)
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19 if um_is_admin(jid, "*") then
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20 return "prosody:operator";
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21 elseif um_is_admin(jid, host) then
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22 return "prosody:admin";
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23 end
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24 return nil;
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25 end
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26
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27 local function get_user_role_name(username, host)
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28 return get_jid_role_name(username.."@"..host, host);
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29 end
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30
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31 -- permissions[host][role_name][permission_name] = is_permitted
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32 local permissions = {};
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33
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34 local role_inheritance = {
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35 ["prosody:operator"] = "prosody:admin";
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36 ["prosody:admin"] = "prosody:member";
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37 ["prosody:member"] = "prosody:registered";
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38 ["prosody:registered"] = "prosody:guest";
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39
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40 -- COMPAT
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41 ["prosody:user"] = "prosody:registered";
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42 };
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43
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44 local function role_may(host, role_name, permission)
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45 local host_roles = permissions[host];
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46 if not host_roles then
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47 return false;
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48 end
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49 local role_permissions = host_roles[role_name];
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50 if not role_permissions then
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51 return false;
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52 end
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53 local next_role = role_inheritance[role_name];
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54 return not not permissions[role_name][permission] or (next_role and role_may(host, next_role, permission));
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55 end
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56
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57 function moduleapi.may(self, action, context)
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58 if action:byte(1) == 58 then -- action begins with ':'
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59 action = self.name..action; -- prepend module name
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60 end
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61 if type(context) == "string" then -- check JID permissions
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62 local role;
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63 local node, host = jid_split(context);
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64 if host == self.host then
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65 role = get_user_role_name(node, self.host);
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66 else
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67 role = get_jid_role_name(context, self.host);
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68 end
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69 if not role then
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70 self:log("debug", "Access denied: JID <%s> may not %s (no role found)", context, action);
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71 return false;
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72 end
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73
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74 local permit = role_may(self.host, role, action);
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75 if not permit then
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76 self:log("debug", "Access denied: JID <%s> may not %s (not permitted by role %s)", context, action, role.name);
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77 end
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78 return permit;
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79 end
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80
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81 local session = context.origin or context.session;
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82 if type(session) ~= "table" then
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83 error("Unable to identify actor session from context");
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84 end
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85 if session.type == "s2sin" or (session.type == "c2s" and session.host ~= self.host) then
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86 local actor_jid = context.stanza.attr.from;
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87 local role_name = get_jid_role_name(actor_jid);
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88 if not role_name then
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89 self:log("debug", "Access denied: JID <%s> may not %s (no role found)", actor_jid, action);
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90 return false;
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91 end
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92 local permit = role_may(self.host, role_name, action, context);
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93 if not permit then
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94 self:log("debug", "Access denied: JID <%s> may not %s (not permitted by role %s)", actor_jid, action, role_name);
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95 end
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96 return permit;
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97 end
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98 end
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99
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100 function moduleapi.default_permission(self, role_name, permission)
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101 local p = permissions[self.host];
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102 if not p then
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103 p = {};
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104 permissions[self.host] = p;
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105 end
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106 local r = p[role_name];
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107 if not r then
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108 r = {};
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109 p[role_name] = r;
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110 end
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111 r[permission] = true;
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112 end
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113
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114 function moduleapi.default_permissions(self, role_name, permission_list)
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115 for _, permission in ipairs(permission_list) do
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116 self:default_permission(role_name, permission);
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117 end
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118 end
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119
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120 function module.add_host(host_module)
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121 permissions[host_module.host] = {};
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122 function host_module.unload()
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123 permissions[host_module.host] = nil;
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124 end
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125 end