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-module(mod_keystore). |
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-behaviour(gen_mod). |
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-behaviour(mongoose_module_metrics). |
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%% gen_mod callbacks |
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-export([start/2]). |
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-export([stop/1]). |
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-export([hooks/1]). |
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-export([supported_features/0]). |
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-export([config_spec/0]). |
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%% Hook handlers |
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-export([get_key/3]). |
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-export([process_key/1]). |
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%% Public types |
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-export_type([key/0, |
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key_id/0, |
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key_list/0, |
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key_name/0, |
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raw_key/0]). |
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-include("mod_keystore.hrl"). |
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-include("mongoose.hrl"). |
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-include("mongoose_config_spec.hrl"). |
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-define(DEFAULT_RAM_KEY_SIZE, 2048). |
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%% A key name is used in the config file to name a key (a class of keys). |
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%% The name doesn't differentiate between virtual hosts |
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%% (i.e. there are multiple keys with the same name, |
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%% one per each XMPP domain). |
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-type key_name() :: atom(). |
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%% A key ID is used to uniquely identify a key for storage backends. |
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%% It's used to maintain separate instances of a key with the same name |
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%% for different virtual hosts. |
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-type key_id() :: {key_name(), mongooseim:host_type()}. |
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-type raw_key() :: binary(). |
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-type key_list() :: [{key_id(), raw_key()}]. |
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-type key_type() :: ram | {file, file:name_all()}. |
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-type key() :: #key{id :: key_id(), key :: raw_key()}. |
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%% |
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%% gen_mod callbacks |
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%% |
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-spec start(mongooseim:host_type(), gen_mod:module_opts()) -> ok. |
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start(HostType, Opts) -> |
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2 |
ejabberd_sup:create_ets_table(keystore, [named_table, public, {read_concurrency, true}]), |
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mod_keystore_backend:init(HostType, Opts), |
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init_keys(HostType, Opts), |
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ok. |
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-spec stop(mongooseim:host_type()) -> ok. |
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stop(HostType) -> |
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2 |
clear_keystore_ets(HostType), |
| 60 |
2 |
mod_keystore_backend:stop(HostType), |
| 61 |
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ok. |
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-spec hooks(mongooseim:host_type()) -> gen_hook:hook_list(). |
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hooks(HostType) -> |
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4 |
[ |
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{get_key, HostType, fun ?MODULE:get_key/3, #{}, 50} |
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]. |
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-spec supported_features() -> [atom()]. |
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supported_features() -> |
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:-( |
[dynamic_domains]. |
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-spec config_spec() -> mongoose_config_spec:config_section(). |
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config_spec() -> |
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206 |
#section{ |
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items = #{<<"ram_key_size">> => #option{type = integer, |
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validate = non_negative}, |
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<<"keys">> => #list{items = keys_spec(), |
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format_items = map} |
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}, |
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defaults = #{<<"ram_key_size">> => ?DEFAULT_RAM_KEY_SIZE, |
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<<"keys">> => #{}} |
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}. |
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keys_spec() -> |
| 86 |
206 |
#section{ |
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items = #{<<"name">> => #option{type = atom, |
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validate = non_empty}, |
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<<"type">> => #option{type = atom, |
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validate = {enum, [file, ram]}}, |
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<<"path">> => #option{type = string, |
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validate = filename} |
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}, |
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required = [<<"name">>, <<"type">>], |
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process = fun ?MODULE:process_key/1 |
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}. |
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process_key(#{name := Name, type := file, path := Path}) -> |
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:-( |
{Name, {file, Path}}; |
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process_key(#{name := Name, type := ram}) -> |
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:-( |
{Name, ram}. |
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%% |
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%% Hook handlers |
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%% |
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-spec get_key(HandlerAcc, Params, Extra) -> {ok, HandlerAcc} when |
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HandlerAcc :: key_list(), |
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Params :: #{key_id := key_id()}, |
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Extra :: gen_hook:extra(). |
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get_key(HandlerAcc, #{key_id := KeyID}, _) -> |
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51 |
NewAcc = try |
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%% This is OK, because the key is |
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%% EITHER stored in ETS |
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%% OR stored in BACKEND, |
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%% with types of both stores returning |
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%% AT MOST ONE value per key. |
| 118 |
51 |
(ets_get_key(KeyID) ++ |
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mod_keystore_backend:get_key(KeyID) ++ |
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HandlerAcc) |
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catch |
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E:R:S -> |
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:-( |
?LOG_ERROR(#{what => get_key_failed, |
| 124 |
:-( |
error => E, reason => R, stacktrace => S}), |
| 125 |
:-( |
HandlerAcc |
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end, |
| 127 |
51 |
{ok, NewAcc}. |
| 128 |
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%% |
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%% Internal functions |
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%% |
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clear_keystore_ets(HostType) -> |
| 133 |
2 |
Pattern = {{'_', HostType}, '$1'}, |
| 134 |
2 |
ets:match_delete(keystore, Pattern). |
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init_keys(HostType, Opts = #{keys := Keys}) -> |
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maps:map(fun(KeyName, KeyType) -> init_key({KeyName, KeyType}, HostType, Opts) end, Keys). |
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-spec init_key({key_name(), key_type()}, mongooseim:host_type(), gen_mod:module_opts()) -> ok. |
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init_key({KeyName, {file, Path}}, HostType, _Opts) -> |
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:-( |
{ok, Data} = file:read_file(Path), |
| 142 |
:-( |
true = ets_store_key({KeyName, HostType}, Data), |
| 143 |
:-( |
ok; |
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init_key({KeyName, ram}, HostType, #{ram_key_size := KeySize}) -> |
| 145 |
4 |
ProposedKey = crypto:strong_rand_bytes(KeySize), |
| 146 |
4 |
KeyRecord = #key{id = {KeyName, HostType}, |
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key = ProposedKey}, |
| 148 |
4 |
{ok, _ActualKey} = mod_keystore_backend:init_ram_key(HostType, KeyRecord), |
| 149 |
4 |
ok. |
| 150 |
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%% It's easier to trace these than ets:{insert, lookup} - much less noise. |
| 152 |
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ets_get_key(KeyID) -> |
| 153 |
51 |
ets:lookup(keystore, KeyID). |
| 154 |
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ets_store_key(KeyID, RawKey) -> |
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:-( |
ets:insert(keystore, {KeyID, RawKey}). |