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annotate mod_net_dovecotauth/mod_net_dovecotauth.lua @ 5424:b45d9a81b3da

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mod_http_oauth2: Revert role selector, going to try something else Back out f2c7bb3af600 Allowing only a single role to be encoded into the grant takes away the possibility of having multiple roles in the grant, one of which is selected when issuing an access token. It also takes away the ability to have zero roles granted, which could be useful e.g. when you only need OIDC scopes.
author Kim Alvefur <zash@zash.se>
date Sun, 07 May 2023 19:40:57 +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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19
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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