prosody
8a2f75e38eb2
plugins/mod_tokenauth.lua

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plugins/mod_tokenauth.lua @ 13019:8a2f75e38eb2

util.fsm: New utility lib for finite state machines
author Matthew Wild <mwild1@gmail.com>
date Thu, 17 Mar 2022 17:45:27 +0000
parent 13010:3e454af3615d
child 13024:7558fd152459
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 local base64 = require "prosody.util.encodings".base64;
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2 local hashes = require "prosody.util.hashes";
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3 local id = require "prosody.util.id";
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4 local jid = require "prosody.util.jid";
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5 local random = require "prosody.util.random";
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6 local usermanager = require "prosody.core.usermanager";
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7 local generate_identifier = require "prosody.util.id".short;
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8
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9 local token_store = module:open_store("auth_tokens", "keyval+");
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10
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11 local access_time_granularity = module:get_option_number("token_auth_access_time_granularity", 60);
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12
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13 local function select_role(username, host, role)
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14 if role then
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15 return prosody.hosts[host].authz.get_role_by_name(role);
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16 end
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17 return usermanager.get_user_role(username, host);
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18 end
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19
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20 function create_grant(actor_jid, grant_jid, grant_ttl, grant_data)
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21 grant_jid = jid.prep(grant_jid);
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22 if not actor_jid or actor_jid ~= grant_jid and not jid.compare(grant_jid, actor_jid) then
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23 module:log("debug", "Actor <%s> is not permitted to create a token granting access to JID <%s>", actor_jid, grant_jid);
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24 return nil, "not-authorized";
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25 end
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26
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27 local grant_username, grant_host, grant_resource = jid.split(grant_jid);
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28
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29 if grant_host ~= module.host then
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30 return nil, "invalid-host";
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31 end
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32
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33 local grant_id = id.short();
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34 local now = os.time();
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35
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36 local grant = {
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37 id = grant_id;
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38
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39 owner = actor_jid;
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40 created = now;
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41 expires = grant_ttl and (now + grant_ttl) or nil;
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42 accessed = now;
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43
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44 jid = grant_jid;
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45 resource = grant_resource;
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46
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47 data = grant_data;
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48
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49 -- tokens[<hash-name>..":"..<secret>] = token_info
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50 tokens = {};
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51 };
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52
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53 local ok, err = token_store:set_key(grant_username, grant_id, grant);
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54 if not ok then
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55 return nil, err;
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56 end
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57
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58 module:fire_event("token-grant-created", {
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59 id = grant_id;
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60 grant = grant;
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61 username = grant_username;
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62 host = grant_host;
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63 });
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64
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65 return grant;
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66 end
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67
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68 function create_token(grant_jid, grant, token_role, token_ttl, token_purpose, token_data)
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69 if (token_data and type(token_data) ~= "table") or (token_purpose and type(token_purpose) ~= "string") then
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70 return nil, "bad-request";
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71 end
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72 local grant_username, grant_host = jid.split(grant_jid);
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73 if grant_host ~= module.host then
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74 return nil, "invalid-host";
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75 end
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76 if type(grant) == "string" then -- lookup by id
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77 grant = token_store:get_key(grant_username, grant);
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78 if not grant then return nil; end
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79 end
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80
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81 if not grant.tokens then return nil, "internal-server-error"; end -- old-style token?
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82
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83 local now = os.time();
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84 local expires = grant.expires; -- Default to same expiry as grant
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85 if token_ttl then -- explicit lifetime requested
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86 if expires then
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87 -- Grant has an expiry, so limit to that or shorter
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88 expires = math.min(now + token_ttl, expires);
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89 else
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90 -- Grant never expires, just use whatever expiry is requested for the token
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91 expires = now + token_ttl;
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92 end
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93 end
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94
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95 local token_info = {
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96 role = token_role;
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97
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98 created = now;
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99 expires = expires;
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100 purpose = token_purpose;
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101
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102 data = token_data;
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103 };
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104
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105 local token_secret = random.bytes(18);
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106 grant.tokens["sha256:"..hashes.sha256(token_secret, true)] = token_info;
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107
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108 local ok, err = token_store:set_key(grant_username, grant.id, grant);
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109 if not ok then
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110 return nil, err;
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111 end
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112
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113 local token_string = "secret-token:"..base64.encode("2;"..grant.id..";"..token_secret..";"..grant.jid);
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114 return token_string, token_info;
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115 end
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116
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117 local function parse_token(encoded_token)
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118 if not encoded_token then return nil; end
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119 local encoded_data = encoded_token:match("^secret%-token:(.+)$");
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120 if not encoded_data then return nil; end
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121 local token = base64.decode(encoded_data);
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122 if not token then return nil; end
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123 local token_id, token_secret, token_jid = token:match("^2;([^;]+);([^;]+);(.+)$");
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124 if not token_id then return nil; end
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125 local token_user, token_host = jid.split(token_jid);
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126 return token_id, token_user, token_host, token_secret;
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127 end
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128
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129 local function clear_expired_grant_tokens(grant, now)
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130 local updated;
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131 now = now or os.time();
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132 for secret, token_info in pairs(grant.tokens) do
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133 local expires = token_info.expires;
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diff changeset
134 if expires and expires < now then
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135 grant.tokens[secret] = nil;
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diff changeset
136 updated = true;
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137 end
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diff changeset
138 end
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139 return updated;
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diff changeset
140 end
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diff changeset
141
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142 local function _get_validated_grant_info(username, grant)
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diff changeset
143 if type(grant) == "string" then
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diff changeset
144 grant = token_store:get_key(username, grant);
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145 end
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diff changeset
146 if not grant or not grant.created then return nil; end
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147
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148 -- Invalidate grants from before last password change
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149 local account_info = usermanager.get_account_info(username, module.host);
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diff changeset
150 local password_updated_at = account_info and account_info.password_updated;
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diff changeset
151 if password_updated_at and grant.created < password_updated_at then
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diff changeset
152 module:log("debug", "Token grant issued before last password change, invalidating it now");
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153 token_store:set_key(username, grant.id, nil);
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154 return nil, "not-authorized";
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diff changeset
155 elseif grant.expires and grant.expires < os.time() then
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156 module:log("debug", "Token grant expired, cleaning up");
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157 token_store:set_key(username, grant.id, nil);
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158 return nil, "expired";
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diff changeset
159 end
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160
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161 return grant;
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162 end
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163
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164 local function _get_validated_token_info(token_id, token_user, token_host, token_secret)
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165 if token_host ~= module.host then
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166 return nil, "invalid-host";
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167 end
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168
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169 local grant, err = token_store:get_key(token_user, token_id);
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170 if not grant or not grant.tokens then
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171 if err then
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172 module:log("error", "Unable to read from token storage: %s", err);
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173 return nil, "internal-error";
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parents:
diff changeset
174 end
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175 module:log("warn", "Invalid token in storage (%s / %s)", token_user, token_id);
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176 return nil, "not-authorized";
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177 end
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178
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179 -- Check provided secret
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180 local secret_hash = "sha256:"..hashes.sha256(token_secret, true);
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181 local token_info = grant.tokens[secret_hash];
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diff changeset
182 if not token_info then
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diff changeset
183 module:log("debug", "No tokens matched the given secret");
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diff changeset
184 return nil, "not-authorized";
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diff changeset
185 end
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diff changeset
186
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diff changeset
187 -- Check expiry
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diff changeset
188 local now = os.time();
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diff changeset
189 if token_info.expires < now then
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diff changeset
190 module:log("debug", "Token has expired, cleaning it up");
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diff changeset
191 grant.tokens[secret_hash] = nil;
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diff changeset
192 token_store:set_key(token_user, token_id, grant);
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193 return nil, "not-authorized";
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194 end
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195
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196 -- Verify grant validity (expiry, etc.)
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197 grant = _get_validated_grant_info(token_user, grant);
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diff changeset
198 if not grant then
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199 return nil, "not-authorized";
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diff changeset
200 end
12742
126aefd2c4c6 mod_tokenauth: Invalidate tokens issued before most recent password change
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201
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202 -- Update last access time if necessary
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diff changeset
203 local last_accessed = grant.accessed;
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diff changeset
204 if not last_accessed or (now - last_accessed) > access_time_granularity then
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diff changeset
205 grant.accessed = now;
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diff changeset
206 clear_expired_grant_tokens(grant); -- Clear expired tokens while we're here
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diff changeset
207 token_store:set_key(token_user, token_id, grant);
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diff changeset
208 end
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diff changeset
209
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diff changeset
210 token_info.id = token_id;
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diff changeset
211 token_info.grant = grant;
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diff changeset
212 token_info.jid = grant.jid;
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diff changeset
213
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diff changeset
214 return token_info;
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parents:
diff changeset
215 end
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parents:
diff changeset
216
13010
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diff changeset
217 function get_grant_info(username, grant_id)
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diff changeset
218 local grant = _get_validated_grant_info(username, grant_id);
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diff changeset
219 if not grant then return nil; end
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diff changeset
220
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diff changeset
221 -- Caller is only interested in the grant, no need to expose token stuff to them
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diff changeset
222 grant.tokens = nil;
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parents: 13009
diff changeset
223
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diff changeset
224 return grant;
3e454af3615d mod_tokenauth: Add API to inspect individual grants or all of a user's grants
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parents: 13009
diff changeset
225 end
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diff changeset
226
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diff changeset
227 function get_user_grants(username)
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diff changeset
228 local grants = token_store:get(username);
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diff changeset
229 if not grants then return nil; end
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parents: 13009
diff changeset
230 for grant_id, grant in pairs(grants) do
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parents: 13009
diff changeset
231 grants[grant_id] = _get_validated_grant_info(username, grant);
3e454af3615d mod_tokenauth: Add API to inspect individual grants or all of a user's grants
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parents: 13009
diff changeset
232 end
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diff changeset
233 return grants;
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parents: 13009
diff changeset
234 end
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diff changeset
235
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diff changeset
236 function get_token_info(token)
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diff changeset
237 local token_id, token_user, token_host, token_secret = parse_token(token);
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diff changeset
238 if not token_id then
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diff changeset
239 module:log("warn", "Failed to verify access token: %s", token_user);
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diff changeset
240 return nil, "invalid-token-format";
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diff changeset
241 end
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diff changeset
242 return _get_validated_token_info(token_id, token_user, token_host, token_secret);
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diff changeset
243 end
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diff changeset
244
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diff changeset
245 function get_token_session(token, resource)
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diff changeset
246 local token_id, token_user, token_host, token_secret = parse_token(token);
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diff changeset
247 if not token_id then
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diff changeset
248 module:log("warn", "Failed to verify access token: %s", token_user);
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diff changeset
249 return nil, "invalid-token-format";
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diff changeset
250 end
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diff changeset
251
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diff changeset
252 local token_info, err = _get_validated_token_info(token_id, token_user, token_host, token_secret);
12649
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diff changeset
253 if not token_info then return nil, err; end
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diff changeset
254
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diff changeset
255 return {
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diff changeset
256 username = token_user;
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diff changeset
257 host = token_host;
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diff changeset
258 resource = token_info.resource or resource or generate_identifier();
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diff changeset
259
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diff changeset
260 role = select_role(token_user, token_host, token_info.role);
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diff changeset
261 };
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parents: 10675
diff changeset
262 end
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parents: 10675
diff changeset
263
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parents:
diff changeset
264 function revoke_token(token)
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parents:
diff changeset
265 local token_id, token_user, token_host = parse_token(token);
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parents:
diff changeset
266 if not token_id then
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diff changeset
267 module:log("warn", "Failed to verify access token: %s", token_user);
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diff changeset
268 return nil, "invalid-token-format";
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parents:
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269 end
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270 if token_host ~= module.host then
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271 return nil, "invalid-host";
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272 end
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273 local ok, err = token_store:set_key(token_user, token_id, nil);
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274 if not ok then
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275 return nil, err;
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276 end
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277 module:fire_event("token-grant-revoked", { id = token_id, username = token_user, host = token_host });
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278 return true;
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279 end
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280
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281 function sasl_handler(auth_provider, purpose, extra)
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282 return function (sasl, token, realm, _authzid)
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283 local token_info, err = get_token_info(token);
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284 if not token_info then
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285 module:log("debug", "SASL handler failed to verify token: %s", err);
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286 return nil, nil, extra;
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287 end
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288 local token_user, token_host, resource = jid.split(token_info.grant.jid);
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289 if realm ~= token_host or (purpose and token_info.purpose ~= purpose) then
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290 return nil, nil, extra;
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291 end
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292 if auth_provider.is_enabled and not auth_provider.is_enabled(token_user) then
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293 return true, false, token_info;
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294 end
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295 sasl.resource = resource;
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296 sasl.token_info = token_info;
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297 return token_user, true, token_info;
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298 end;
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299 end