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annotate mod_compat_roles/mod_compat_roles.lua @ 5186:fa3059e653fa

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mod_http_oauth2: Implement the Implicit flow Everyone says this is insecure and bad, but it's also the only thing that makes sense for e.g. pure JavaScript clients, but hey implement this even more complicated thing instead!
author Kim Alvefur <zash@zash.se>
date Thu, 02 Mar 2023 22:06:50 +0100
parents f03f4ec859a3
children 825c6fb76c48
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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:user";
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37 ["prosody:user"] = "prosody:restricted";
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38 };
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39
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40 local function role_may(host, role_name, permission)
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41 local host_roles = permissions[host];
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42 if not host_roles then
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43 return false;
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44 end
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45 local role_permissions = host_roles[role_name];
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46 if not role_permissions then
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47 return false;
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48 end
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49 local next_role = role_inheritance[role_name];
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50 return not not permissions[role_name][permission] or (next_role and role_may(host, next_role, permission));
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51 end
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52
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53 function moduleapi.may(self, action, context)
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54 if action:byte(1) == 58 then -- action begins with ':'
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55 action = self.name..action; -- prepend module name
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56 end
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57 if type(context) == "string" then -- check JID permissions
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58 local role;
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59 local node, host = jid_split(context);
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60 if host == self.host then
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61 role = get_user_role_name(node, self.host);
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62 else
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63 role = get_jid_role_name(context, self.host);
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64 end
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65 if not role then
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66 self:log("debug", "Access denied: JID <%s> may not %s (no role found)", context, action);
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67 return false;
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68 end
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69
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70 local permit = role_may(self.host, role, action);
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71 if not permit then
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72 self:log("debug", "Access denied: JID <%s> may not %s (not permitted by role %s)", context, action, role.name);
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73 end
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74 return permit;
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75 end
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76
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77 local session = context.origin or context.session;
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78 if type(session) ~= "table" then
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79 error("Unable to identify actor session from context");
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80 end
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81 if session.type == "s2sin" or (session.type == "c2s" and session.host ~= self.host) then
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82 local actor_jid = context.stanza.attr.from;
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83 local role_name = get_jid_role_name(actor_jid);
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84 if not role_name then
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85 self:log("debug", "Access denied: JID <%s> may not %s (no role found)", actor_jid, action);
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86 return false;
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87 end
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88 local permit = role_may(self.host, role_name, action, context);
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89 if not permit then
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90 self:log("debug", "Access denied: JID <%s> may not %s (not permitted by role %s)", actor_jid, action, role_name);
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91 end
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92 return permit;
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93 end
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94 end
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95
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96 function moduleapi.default_permission(self, role_name, permission)
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97 local p = permissions[self.host];
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98 if not p then
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99 p = {};
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100 permissions[self.host] = p;
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101 end
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102 local r = p[role_name];
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103 if not r then
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104 r = {};
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105 p[role_name] = r;
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106 end
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107 r[permission] = true;
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108 end
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109
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110 function moduleapi.default_permissions(self, role_name, permission_list)
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111 for _, permission in ipairs(permission_list) do
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112 self:default_permission(role_name, permission);
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113 end
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114 end
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115
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116 function module.add_host(host_module)
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117 permissions[host_module.host] = {};
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118 function host_module.unload()
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119 permissions[host_module.host] = nil;
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120 end
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121 end