prosody-modules
c539334dd01a
mod_net_dovecotauth/mod_net_dovecotauth.lua

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mod_net_dovecotauth/mod_net_dovecotauth.lua @ 4260:c539334dd01a

mod_http_oauth2: Rescope oauth client config into users' storage This produces client_id of the form owner@host/random and prevents clients from being deleted by registering an account with the same name and then deleting the account, as well as having the client automatically be deleted when the owner account is removed. On one hand, this leaks the bare JID of the creator to users. On the other hand, it makes it obvious who made the oauth application. This module is experimental and only for developers, so this can be changed if a better method comes up.
author Kim Alvefur <zash@zash.se>
date Sat, 21 Nov 2020 23:55:10 +0100
parent 2459:8e686bf63441
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1 -- mod_net_dovecotauth.lua
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2 --
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3 -- Protocol spec:
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4 -- http://dovecot.org/doc/auth-protocol.txt
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5 --
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6 -- Example postfix config:
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7 -- sudo postconf smtpd_sasl_path=inet:127.0.0.1:28484
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8 -- sudo postconf smtpd_sasl_type=dovecot
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9 -- sudo postconf smtpd_sasl_auth_enable=yes
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10
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11 module:set_global();
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12
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13 -- Imports
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14 local new_sasl = require "core.usermanager".get_sasl_handler;
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15 local user_exists = require "core.usermanager".user_exists;
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16 local base64 = require"util.encodings".base64;
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17 local dump = require"util.serialization".serialize;
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18 local pposix = require "util.pposix";
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20 -- Config
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21 local default_vhost = module:get_option_string("dovecotauth_host", (next(hosts))); -- TODO Is there a better solution?
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22 local allow_master = module:get_option_boolean("dovecotauth_allow_master", false);
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23
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24 -- Active sessions
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25 local sessions = {};
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26
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27 -- Session methods
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28 local new_session;
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29 do
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30 local sess = { };
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31 local sess_mt = { __index = sess };
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32
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33 function new_session(conn)
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34 local s = { type = "?", conn = conn, buf = "", sasl = {} }
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35 function s:log(l, m, ...)
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36 return module:log(l, self.type..tonumber(tostring(self):match("%x+$"), 16)..": "..m, ...);
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37 end
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38 return setmetatable(s, sess_mt);
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39 end
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40
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41 function sess:send(...)
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42 local data = table.concat({...}, "\t") .. "\n"
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43 -- self:log("debug", "SEND: %s", dump(ret));
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44 return self.conn:write(data);
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45 end
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46
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47 local mech_params = {
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48 ANONYMOUS = "anonymous";
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49 PLAIN = "plaintext";
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50 ["DIGEST-MD5"] = "mutual-auth";
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51 ["SCRAM-SHA-1"] = "mutual-auth";
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52 ["SCRAM-SHA-1-PLUS"] = "mutual-auth";
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53 }
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54
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55 function sess:handshake()
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56 self:send("VERSION", 1, 1);
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57 self:send("SPID", pposix.getpid());
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58 self:send("CUID", tonumber(tostring(self):match"%x+$", 16));
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59 for mech in pairs(self.g_sasl:mechanisms()) do
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60 self:send("MECH", mech, mech_params[mech]);
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61 end
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62 self:send("DONE");
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63 end
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64
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65 function sess:feed(data)
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66 -- TODO break this up a bit
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67 -- module:log("debug", "sess = %s", dump(self));
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68 local buf = self.buf;
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69 buf = buf .. data;
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70 local line, eol = buf:match("(.-)\r?\n()")
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71 while line and line ~= "" do
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72 buf = buf:sub(eol);
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73 self.buf = buf;
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74 local part = line:gmatch("[^\t]+");
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75 local command = part();
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76 if command == "VERSION" then
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77 local major = tonumber(part());
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78 local minor = tonumber(part());
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79 if major ~= 1 then
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80 self:log("warn", "Wrong version, expected 1.1, got %s.%s", tostring(major), tostring(minor));
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81 self.conn:close();
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82 break;
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83 end
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84 elseif command == "CPID" then
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85 self.type = "C";
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86 self.pid = part();
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87 elseif command == "SPID" and allow_master then
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88 self.type = "M";
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89 self.pid = part();
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90 elseif command == "AUTH" and self.type ~= "?" then
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91 -- C: "AUTH" TAB <id> TAB <mechanism> TAB service=<service> [TAB <parameters>]
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92 local id = part() -- <id>
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93 local sasl = self.sasl[id];
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94 local mech = part();
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95 if not sasl then
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96 -- TODO Should maybe initialize SASL handler after parsing the line?
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97 sasl = self.g_sasl:clean_clone();
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98 self.sasl[id] = sasl;
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99 if not sasl:select(mech) then
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100 self:send("FAIL", id, "reason=invalid-mechanism");
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101 self.sasl[id] = nil;
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102 sasl = false
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103 end
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104 end
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105 if sasl then
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106 local params = {}; -- Not used for anything yet
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107 for p in part do
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108 local k,v = p:match("^([^=]*)=(.*)$");
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109 if k == "resp" then
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110 self:log("debug", "params = %s", dump(params));
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111 v = base64.decode(v);
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112 local status, ret, err = sasl:process(v);
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113 self:log("debug", status);
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114 if status == "challenge" then
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115 self:send("CONT", id, base64.encode(ret));
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116 elseif status == "failure" then
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117 self.sasl[id] = nil;
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118 self:send("FAIL", id, "reason="..tostring(err));
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119 elseif status == "success" then
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120 self.sasl[id] = nil;
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121 self:send("OK", id, "user="..sasl.username, ret and "resp="..base64.encode(ret));
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122 end
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123 break; -- resp MUST be the last param
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124 else
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125 params[k or p] = v or true;
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126 end
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127 end
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128 end
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129 elseif command == "USER" and self.type == "M" then
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130 -- FIXME Should this be on a separate listener?
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131 local id = part();
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132 local user = part();
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133 if user and user_exists(user, default_vhost) then
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134 self:send("USER", id);
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135 else
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136 self:send("NOTFOUND", id);
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137 end
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138 else
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139 self:log("warn", "Unhandled command %s", tostring(command));
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140 self.conn:close();
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141 break;
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142 end
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143 line, eol = buf:match("(.-)\r?\n()")
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144 end
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145 end
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146
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147 end
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148
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149 local listener = {}
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150
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151 function listener.onconnect(conn)
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152 local s = new_session(conn);
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153 sessions[conn] = s;
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154 local g_sasl = new_sasl(default_vhost, s);
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155 s.g_sasl = g_sasl;
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156 s:handshake();
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157 end
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158
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159 function listener.onincoming(conn, data)
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160 local s = sessions[conn];
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161 -- s:log("debug", "RECV %s", dump(data));
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162 return s:feed(data);
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163 end
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164
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165 function listener.ondisconnect(conn)
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166 sessions[conn] = nil;
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167 end
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168
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169 function module.unload()
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170 for c in pairs(sessions) do
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171 c:close();
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172 end
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173 end
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174
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175 module:provides("net", {
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176 default_port = 28484;
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177 listener = listener;
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178 });
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179