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annotate mod_net_dovecotauth/mod_net_dovecotauth.lua @ 5903:6fb26b6691c0

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author Jonas Schäfer <jonas@wielicki.name>
date Sat, 11 May 2024 09:52:11 +0200
parents 8e686bf63441
children
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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();
2011
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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