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3
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1 local usermanager = require "core.usermanager"
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2 local httpserver = require "net.httpserver"
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3 local jidutil = require "util.jid"
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4 local hmac = require "hmac"
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5
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6 local base64 = require "util.encodings".base64
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7
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8 local humane = require "util.serialization".serialize
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9
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10 -- Configuration
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11 local base = "openid"
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12 local openidns = "http://specs.openid.net/auth/2.0" -- [#4.1.2]
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13 local response_404 = { status = "404 Not Found", body = "<h1>Page Not Found</h1>Sorry, we couldn't find what you were looking for :(" };
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14
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15 local associations = {}
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16
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17 local function genkey(length)
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18 -- FIXME not cryptographically secure
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19 str = {}
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20
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21 for i = 1,length do
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22 local rand = math.random(33, 126)
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23 table.insert(str, string.char(rand))
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24 end
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25
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26 return table.concat(str)
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27 end
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28
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29 local function tokvstring(dict)
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30 -- key-value encoding for a dictionary [#4.1.3]
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31 local str = ""
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32
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33 for k,v in pairs(dict) do
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34 str = str..k..":"..v.."\n"
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35 end
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36
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37 return str
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38 end
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39
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40 local function newassoc(key, shared)
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41 -- TODO don't use genkey here
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42 local handle = genkey(16)
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43 associations[handle] = {}
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44 associations[handle]["key"] = key
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45 associations[handle]["shared"] = shared
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46 associations[handle]["time"] = os.time()
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47 return handle
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48 end
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49
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50 local function split(str, sep)
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51 local splits = {}
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52 str:gsub("([^.."..sep.."]*)"..sep, function(c) table.insert(splits, c) end)
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53 return splits
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54 end
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55
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56 local function sign(response, key)
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57 local fields = {}
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58
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59 for _,field in pairs(split(response["openid.signed"],",")) do
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60 fields[field] = response["openid."..field]
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61 end
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62
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63 -- [#10.1]
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64 return base64.encode(hmac.sha256(key, tokvstring(fields)))
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65 end
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66
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67 local function urlencode(s)
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68 return (string.gsub(s, "%W",
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69 function(str)
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70 return string.format("%%%02X", string.byte(str))
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71 end))
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72 end
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73
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74 local function urldecode(s)
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75 return(string.gsub(string.gsub(s, "+", " "), "%%(%x%x)",
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76 function(str)
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77 return string.char(tonumber(str,16))
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78 end))
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79 end
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80
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81 local function utctime()
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82 local now = os.time()
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83 local diff = os.difftime(now, os.time(os.date("!*t", now)))
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84 return now-diff
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85 end
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86
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87 local function nonce()
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88 -- generate a response nonce [#10.1]
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89 local random = ""
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90 for i=0,10 do
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91 random = random..string.char(math.random(33,126))
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92 end
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93
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94 local timestamp = os.date("%Y-%m-%dT%H:%M:%SZ", utctime())
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95
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96 return timestamp..random
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97 end
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98
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99 local function query_params(query)
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100 if type(query) == "string" and #query > 0 then
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101 if query:match("=") then
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102 local params = {}
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103 for k, v in query:gmatch("&?([^=%?]+)=([^&%?]+)&?") do
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104 if k and v then
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105 params[urldecode(k)] = urldecode(v)
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106 end
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107 end
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108 return params
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109 else
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110 return urldecode(query)
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111 end
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112 end
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113 end
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114
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115 local function split_host_port(combined)
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116 local host = combined
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117 local port = ""
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118 local cpos = string.find(combined, ":")
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119 if cpos ~= nil then
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120 host = string.sub(combined, 0, cpos-1)
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121 port = string.sub(combined, cpos+1)
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122 end
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123
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124 return host, port
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125 end
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126
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127 local function toquerystring(dict)
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128 -- query string encoding for a dictionary [#4.1.3]
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129 local str = ""
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130
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131 for k,v in pairs(dict) do
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132 str = str..urlencode(k).."="..urlencode(v).."&"
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133 end
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134
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135 return string.sub(str, 0, -1)
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136 end
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137
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138 local function match_realm(url, realm)
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139 -- FIXME do actual match [#9.2]
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140 return true
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141 end
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142
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143 local function handle_endpoint(method, body, request)
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144 module:log("debug", "Request at OpenID provider endpoint")
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145
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146 local params = nil
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147
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148 if method == "GET" then
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149 params = query_params(request.url.query)
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150 elseif method == "POST" then
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151 params = query_params(body)
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152 else
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153 -- TODO error
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154 return response_404
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155 end
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156
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157 module:log("debug", "Request Parameters:\n"..humane(params))
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158
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159 if params["openid.ns"] == openidns then
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160 -- OpenID 2.0 request [#5.1.1]
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161 if params["openid.mode"] == "associate" then
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162 -- Associate mode [#8]
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163 -- TODO implement association
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164
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165 -- Error response [#8.2.4]
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166 local openidresponse = {
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167 ["ns"] = openidns,
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168 ["session_type"] = params["openid.session_type"],
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169 ["assoc_type"] = params["openid.assoc_type"],
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170 ["error"] = "Association not supported... yet",
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171 ["error_code"] = "unsupported-type",
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172 }
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173
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174 local kvresponse = tokvstring(openidresponse)
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175 module:log("debug", "OpenID Response:\n"..kvresponse)
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176 return {
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177 headers = {
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178 ["Content-Type"] = "text/plain"
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179 },
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180 body = kvresponse
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181 }
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182 elseif params["openid.mode"] == "checkid_setup" or params["openid.mode"] == "checkid_immediate" then
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183 -- Requesting authentication [#9]
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184 if not params["openid.realm"] then
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185 -- set realm to default value of return_to [#9.1]
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186 if params["openid.return_to"] then
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187 params["openid.realm"] = params["openid.return_to"]
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188 else
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189 -- neither was sent, error [#9.1]
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190 -- FIXME return proper error
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191 return response_404
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192 end
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193 end
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194
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195 if params["openid.return_to"] then
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196 -- Assure that the return_to url matches the realm [#9.2]
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197 if not match_realm(params["openid.return_to"], params["openid.realm"]) then
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198 -- FIXME return proper error
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199 return response_404
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200 end
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201
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202 -- Verify the return url [#9.2.1]
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203 -- TODO implement return url verification
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204 end
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205
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206 if params["openid.claimed_id"] and params["openid.identity"] then
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207 -- asserting an identifier [#9.1]
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208
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209 if params["openid.identity"] == "http://specs.openid.net/auth/2.0/identifier_select" then
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210 -- automatically select an identity [#9.1]
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211 params["openid.identity"] = params["openid.claimed_id"]
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212 end
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213
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214 if params["openid.mode"] == "checkid_setup" then
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215 -- Check ID Setup mode
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216 -- TODO implement: NEXT STEP
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217 local head = "<title>Prosody OpenID : Login</title>"
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218 local body = string.format([[
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219 <p>Open ID Authentication<p>
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220 <p>Identifier: <tt>%s</tt></p>
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221 <p>Realm: <tt>%s</tt></p>
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222 <p>Return: <tt>%s</tt></p>
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223 <form method="POST" action="%s">
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224 Jabber ID: <input type="text" name="jid"/><br/>
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225 Password: <input type="password" name="password"/><br/>
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226 <input type="hidden" name="openid.return_to" value="%s"/>
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227 <input type="submit" value="Authenticate"/>
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228 </form>
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229 ]], params["openid.claimed_id"], params["openid.realm"], params["openid.return_to"], base, params["openid.return_to"])
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230
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231 return string.format([[
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232 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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233 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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234 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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235 <head>
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236 <meta http-equiv="Content-type" content="text/html;charset=UTF-8" />
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237 %s
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238 </head>
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239 <body>
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240 %s
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241 </body>
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242 </html>
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243 ]], head, body)
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244 elseif params["openid.mode"] == "checkid_immediate" then
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245 -- Check ID Immediate mode [#9.3]
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246 -- TODO implement check id immediate
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247 end
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248 else
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249 -- not asserting an identifier [#9.1]
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250 -- used for extensions
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251 -- TODO implement common extensions
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252 end
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253 elseif params["openid.mode"] == "check_authentication" then
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254 module:log("debug", "OpenID Check Authentication Mode")
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255 local assoc = associations[params["openid.assoc_handle"]]
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256 module:log("debug", "Checking Association Handle: "..params["openid.assoc_handle"])
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257 if assoc and not assoc["shared"] then
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258 module:log("debug", "Found valid association")
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259 local sig = sign(params, assoc["key"])
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260
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261 local is_valid = "false"
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262 if sig == params["openid.sig"] then
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263 is_valid = "true"
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264 end
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265
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266 module:log("debug", "Signature is: "..is_valid)
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267
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268 openidresponse = {
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269 ns = openidns,
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270 is_valid = is_valid,
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271 }
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272
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273 -- Delete this association
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274 associations[params["openid.assoc_handle"]] = nil
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275 return {
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276 headers = {
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277 ["Content-Type"] = "text/plain"
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278 },
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279 body = tokvstring(openidresponse),
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280 }
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281 else
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282 module:log("debug", "No valid association")
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283 -- TODO return error
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284 -- Invalidate the handle [#11.4.2.2]
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285 end
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286 else
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287 -- Some other mode
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288 -- TODO error
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289 end
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290 elseif params["password"] then
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291 -- User is authenticating
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292 local user, domain = jidutil.split(params["jid"])
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293 module:log("debug", "Authenticating "..params["jid"].." ("..user..","..domain..") with password: "..params["password"])
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294 local valid = usermanager.validate_credentials(domain, user, params["password"], "PLAIN")
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295 if valid then
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296 module:log("debug", "Authentication Succeeded: "..params["jid"])
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297 if params["openid.return_to"] ~= "" then
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298 -- TODO redirect the user to return_to with the openid response
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299 -- included, need to handle the case if its a GET, that there are
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300 -- existing query parameters on the return_to URL [#10.1]
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301 local host, port = split_host_port(request.headers.host)
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302 local endpointurl = ""
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303 if port == '' then
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304 endpointurl = string.format("http://%s/%s", host, base)
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305 else
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306 endpointurl = string.format("http://%s:%s/%s", host, port, base)
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307 end
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308
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309 local nonce = nonce()
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310 local key = genkey(32)
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311 local assoc_handle = newassoc(key)
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312
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313 local openidresponse = {
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314 ["openid.ns"] = openidns,
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315 ["openid.mode"] = "id_res",
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316 ["openid.op_endpoint"] = endpointurl,
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317 ["openid.claimed_id"] = endpointurl.."/"..user,
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318 ["openid.identity"] = endpointurl.."/"..user,
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319 ["openid.return_to"] = params["openid.return_to"],
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320 ["openid.response_nonce"] = nonce,
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321 ["openid.assoc_handle"] = assoc_handle,
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322 ["openid.signed"] = "op_endpoint,identity,claimed_id,return_to,assoc_handle,response_nonce", -- FIXME
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323 ["openid.sig"] = nil,
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324 }
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325
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326 openidresponse["openid.sig"] = sign(openidresponse, key)
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327
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328 queryresponse = toquerystring(openidresponse)
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329
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330 redirecturl = params["openid.return_to"]
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331 -- add the parameters to the return_to
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332 if redirecturl:match("?") then
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333 redirecturl = redirecturl.."&"
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334 else
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335 redirecturl = redirecturl.."?"
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336 end
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337
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338 redirecturl = redirecturl..queryresponse
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339
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340 module:log("debug", "Open ID Positive Assertion Response Table:\n"..humane(openidresponse))
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341 module:log("debug", "Open ID Positive Assertion Response URL:\n"..queryresponse)
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342 module:log("debug", "Redirecting User to:\n"..redirecturl)
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343 return {
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344 status = "303 See Other",
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345 headers = {
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346 Location = redirecturl,
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347 },
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348 body = "Redirecting to: "..redirecturl -- TODO Include a note with a hyperlink to redirect
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349 }
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350 else
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351 -- TODO Do something useful is there is no return_to
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352 end
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353 else
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354 module:log("debug", "Authentication Failed: "..params["jid"])
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355 -- TODO let them try again
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356 end
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357 else
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358 -- Not an Open ID request, do something useful
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359 -- TODO
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360 end
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361
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362 return response_404
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363 end
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364
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365 local function handle_identifier(method, body, request, id)
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366 module:log("debug", "Request at OpenID identifier")
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367 local host, port = split_host_port(request.headers.host)
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368
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369 local user_name = ""
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370 local user_domain = ""
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371 local apos = string.find(id, "@")
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372 if apos == nil then
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373 user_name = id
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374 user_domain = host
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375 else
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376 user_name = string.sub(id, 0, apos-1)
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377 user_domain = string.sub(id, apos+1)
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378 end
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379
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380 user, domain = jidutil.split(id)
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381
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382 local exists = usermanager.user_exists(user_name, user_domain)
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383
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384 if not exists then
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385 return response_404
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386 end
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387
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388 local endpointurl = ""
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389 if port == '' then
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390 endpointurl = string.format("http://%s/%s", host, base)
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391 else
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392 endpointurl = string.format("http://%s:%s/%s", host, port, base)
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393 end
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394
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395 local head = string.format("<title>Prosody OpenID : %s@%s</title>", user_name, user_domain)
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396 -- OpenID HTML discovery [#7.3]
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397 head = head .. string.format('<link rel="openid2.provider" href="%s" />', endpointurl)
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398
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399 local content = 'request.url.path: ' .. request.url.path .. '<br/>'
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400 content = content .. 'host+port: ' .. request.headers.host .. '<br/>'
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401 content = content .. 'host: ' .. tostring(host) .. '<br/>'
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402 content = content .. 'port: ' .. tostring(port) .. '<br/>'
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403 content = content .. 'user_name: ' .. user_name .. '<br/>'
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404 content = content .. 'user_domain: ' .. user_domain .. '<br/>'
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405 content = content .. 'exists: ' .. tostring(exists) .. '<br/>'
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406
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407 local body = string.format('<p>%s</p>', content)
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408
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409 local data = string.format([[
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410 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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411 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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412 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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413 <head>
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414 <meta http-equiv="Content-type" content="text/html;charset=UTF-8" />
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415 %s
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416 </head>
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417 <body>
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418 %s
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419 </body>
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420 </html>
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421 ]], head, body)
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422 return data;
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423 end
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424
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425 local function handle_request(method, body, request)
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426 module:log("debug", "Received request")
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427
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428 -- Make sure the host is enabled
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429 local host = split_host_port(request.headers.host)
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430 if not hosts[host] then
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431 return response_404
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432 end
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433
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434 if request.url.path == "/"..base then
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435 -- OpenID Provider Endpoint
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436 return handle_endpoint(method, body, request)
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437 else
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438 local id = request.url.path:match("^/"..base.."/(.+)$")
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439 if id then
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440 -- OpenID Identifier
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441 return handle_identifier(method, body, request, id)
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442 else
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443 return response_404
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444 end
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445 end
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446 end
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447
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448 httpserver.new{ port = 5280, base = base, handler = handle_request, ssl = false}
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