Tue, 17 Nov 2009 00:56:41 +0100
Initial commit of SCRAM SASL mechanism.
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1 | -- Prosody IM |
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2 | -- Copyright (C) 2008-2009 Matthew Wild |
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3 | -- Copyright (C) 2008-2009 Waqas Hussain |
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4 | -- |
758 | 5 | -- This project is MIT/X11 licensed. Please see the |
6 | -- COPYING file in the source package for more information. | |
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7 | -- |
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8 | |
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9 | |
38 | 10 | |
11 | local st = require "util.stanza"; | |
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12 | local sm_bind_resource = require "core.sessionmanager".bind_resource; |
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13 | local sm_make_authenticated = require "core.sessionmanager".make_authenticated; |
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14 | local base64 = require "util.encodings".base64; |
38 | 15 | |
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16 | local nodeprep = require "util.encodings".stringprep.nodeprep; |
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17 | local datamanager_load = require "util.datamanager".load; |
38 | 18 | local usermanager_validate_credentials = require "core.usermanager".validate_credentials; |
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19 | local usermanager_get_supported_methods = require "core.usermanager".get_supported_methods; |
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20 | local usermanager_user_exists = require "core.usermanager".user_exists; |
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21 | local usermanager_get_password = require "core.usermanager".get_password; |
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22 | local t_concat, t_insert = table.concat, table.insert; |
38 | 23 | local tostring = tostring; |
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24 | local jid_split = require "util.jid".split |
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25 | local md5 = require "util.hashes".md5; |
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26 | local config = require "core.configmanager"; |
38 | 27 | |
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28 | local secure_auth_only = config.get(module:get_host(), "core", "c2s_require_encryption") or config.get(module:get_host(), "core", "require_encryption"); |
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29 | |
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30 | local log = module._log; |
38 | 31 | |
32 | local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl'; | |
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33 | local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind'; |
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34 | local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas'; |
38 | 35 | |
36 | local new_sasl = require "util.sasl".new; | |
37 | ||
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38 | default_authentication_profile = { |
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39 | plain = function(username, realm) |
2189 | 40 | local prepped_username = nodeprep(username); |
41 | if not prepped_username then | |
42 | log("debug", "NODEprep failed on username: %s", username); | |
43 | return "", nil; | |
44 | end | |
45 | local password = usermanager_get_password(prepped_username, realm); | |
46 | if not password then | |
47 | return "", nil; | |
48 | end | |
49 | return password, true; | |
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50 | end |
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51 | }; |
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52 | |
2189 | 53 | anonymous_authentication_profile = { |
54 | anonymous = function(username, realm) | |
55 | return true; -- for normal usage you should always return true here | |
56 | end | |
57 | } | |
58 | ||
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59 | local function build_reply(status, ret, err_msg) |
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60 | local reply = st.stanza(status, {xmlns = xmlns_sasl}); |
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61 | if status == "challenge" then |
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62 | log("debug", "%s", ret or ""); |
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63 | reply:text(base64.encode(ret or "")); |
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64 | elseif status == "failure" then |
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65 | reply:tag(ret):up(); |
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66 | if err_msg then reply:tag("text"):text(err_msg); end |
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67 | elseif status == "success" then |
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68 | log("debug", "%s", ret or ""); |
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69 | reply:text(base64.encode(ret or "")); |
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70 | else |
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71 | module:log("error", "Unknown sasl status: %s", status); |
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72 | end |
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73 | return reply; |
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74 | end |
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75 | |
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76 | local function handle_status(session, status) |
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77 | if status == "failure" then |
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78 | session.sasl_handler = nil; |
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79 | elseif status == "success" then |
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80 | local username = nodeprep(session.sasl_handler.username); |
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81 | if not username then -- TODO move this to sessionmanager |
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82 | module:log("warn", "SASL succeeded but we didn't get a username!"); |
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83 | session.sasl_handler = nil; |
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84 | session:reset_stream(); |
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85 | return; |
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86 | end |
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87 | sm_make_authenticated(session, session.sasl_handler.username); |
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88 | session.sasl_handler = nil; |
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89 | session:reset_stream(); |
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90 | end |
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91 | end |
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92 | |
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93 | local function sasl_handler(session, stanza) |
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94 | if stanza.name == "auth" then |
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95 | -- FIXME ignoring duplicates because ejabberd does |
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96 | if config.get(session.host or "*", "core", "anonymous_login") then |
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97 | if stanza.attr.mechanism ~= "ANONYMOUS" then |
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98 | return session.send(build_reply("failure", "invalid-mechanism")); |
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99 | end |
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100 | elseif stanza.attr.mechanism == "ANONYMOUS" then |
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101 | return session.send(build_reply("failure", "mechanism-too-weak")); |
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102 | end |
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103 | local valid_mechanism = session.sasl_handler:select(stanza.attr.mechanism); |
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104 | if not valid_mechanism then |
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105 | return session.send(build_reply("failure", "invalid-mechanism")); |
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106 | end |
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107 | elseif not session.sasl_handler then |
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108 | return; -- FIXME ignoring out of order stanzas because ejabberd does |
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109 | end |
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110 | local text = stanza[1]; |
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111 | if text then |
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112 | text = base64.decode(text); |
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113 | log("debug", "%s", text); |
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114 | if not text then |
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115 | session.sasl_handler = nil; |
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116 | session.send(build_reply("failure", "incorrect-encoding")); |
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117 | return; |
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118 | end |
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119 | end |
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120 | local status, ret, err_msg = session.sasl_handler:process(text); |
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121 | handle_status(session, status); |
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122 | local s = build_reply(status, ret, err_msg); |
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123 | log("debug", "sasl reply: %s", tostring(s)); |
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124 | session.send(s); |
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125 | end |
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126 | |
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127 | module:add_handler("c2s_unauthed", "auth", xmlns_sasl, sasl_handler); |
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128 | module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler); |
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129 | module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler); |
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130 | |
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131 | local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' }; |
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132 | local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' }; |
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133 | local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' }; |
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134 | module:add_event_hook("stream-features", |
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135 | function (session, features) |
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136 | if not session.username then |
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137 | if secure_auth_only and not session.secure then |
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138 | return; |
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139 | end |
2189 | 140 | if config.get(session.host or "*", "core", "anonymous_login") then |
141 | session.sasl_handler = new_sasl(session.host, anonymous_authentication_profile); | |
142 | else | |
143 | session.sasl_handler = new_sasl(session.host, default_authentication_profile); | |
144 | end | |
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145 | features:tag("mechanisms", mechanisms_attr); |
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146 | -- TODO: Provide PLAIN only if TLS is active, this is a SHOULD from the introduction of RFC 4616. This behavior could be overridden via configuration but will issuing a warning or so. |
2189 | 147 | for k, v in pairs(session.sasl_handler:mechanisms()) do |
148 | features:tag("mechanism"):text(v):up(); | |
149 | end | |
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150 | features:up(); |
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151 | else |
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152 | features:tag("bind", bind_attr):tag("required"):up():up(); |
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153 | features:tag("session", xmpp_session_attr):tag("optional"):up():up(); |
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154 | end |
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155 | end); |
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156 | |
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157 | module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind", |
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158 | function (session, stanza) |
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159 | log("debug", "Client requesting a resource bind"); |
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160 | local resource; |
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161 | if stanza.attr.type == "set" then |
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162 | local bind = stanza.tags[1]; |
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163 | if bind and bind.attr.xmlns == xmlns_bind then |
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164 | resource = bind:child_with_name("resource"); |
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165 | if resource then |
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166 | resource = resource[1]; |
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167 | end |
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168 | end |
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169 | end |
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170 | local success, err_type, err, err_msg = sm_bind_resource(session, resource); |
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171 | if not success then |
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172 | session.send(st.error_reply(stanza, err_type, err, err_msg)); |
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173 | else |
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174 | session.send(st.reply(stanza) |
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175 | :tag("bind", { xmlns = xmlns_bind}) |
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176 | :tag("jid"):text(session.full_jid)); |
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177 | end |
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178 | end); |
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179 | |
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180 | module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session", |
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181 | function (session, stanza) |
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182 | log("debug", "Client requesting a session"); |
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183 | session.send(st.reply(stanza)); |
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184 | end); |