prosody-modules
5d46281a5d23
mod_auth_imap/auth_imap/sasl_imap.lib.lua

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mod_auth_imap/auth_imap/sasl_imap.lib.lua @ 1199:5d46281a5d23

mod_auth_imap: Minor cleanup of imports
author Matthew Wild <mwild1@gmail.com>
date Thu, 26 Sep 2013 18:12:27 +0100
parent 1196:f45ca6edc159
child 1200:34216cdffda6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1196
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Kim Alvefur <zash@zash.se>
parents:
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1 -- Dovecot authentication backend for Prosody
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2 --
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3 -- Copyright (C) 2011 Kim Alvefur
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4 --
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5
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6 local log = require "util.logger".init("sasl_imap");
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7
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8 local setmetatable = setmetatable;
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9
1199
5d46281a5d23 mod_auth_imap: Minor cleanup of imports
Matthew Wild <mwild1@gmail.com>
parents: 1196
diff changeset
10 local s_match = string.match;
1196
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11 local t_concat = table.concat;
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12 local tostring, tonumber = tostring, tonumber;
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13
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14 local socket = require "socket"
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15 -- TODO -- local ssl = require "ssl"
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16 local base64 = require "util.encodings".base64;
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17 local b64, unb64 = base64.encode, base64.decode;
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18
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19 local _M = {};
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20
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21 local method = {};
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22 method.__index = method;
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23
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24 -- For extracting the username.
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25 local mitm = {
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26 PLAIN = function(message)
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27 return s_match(message, "^[^%z]*%z([^%z]+)%z[^%z]+");
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28 end,
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29 ["SCRAM-SHA-1"] = function(message)
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30 return s_match(message, "^[^,]+,[^,]*,n=([^,]*)");
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31 end,
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32 ["DIGEST-MD5"] = function(message)
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33 return s_match(message, "username=\"([^\"]*)\"");
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34 end,
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35 }
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36
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37 local function connect(host, port, ssl)
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38 port = tonumber(port) or (ssl and 993 or 143);
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39 log("debug", "connect() to %s:%s:%d", ssl and "ssl" or "tcp", host, tonumber(port));
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40 local conn = socket.tcp();
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41
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42 -- Create a connection to imap socket
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43 log("debug", "connecting to imap at '%s:%d'", host, port);
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44 local ok, err = conn:connect(host, port);
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45 conn:settimeout(10);
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46 if not ok then
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47 log("error", "error connecting to imap at '%s:%d'. error was '%s'. check permissions", host, port, err);
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48 return false;
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49 end
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50
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51 -- Parse IMAP handshake
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52 local done = false;
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53 local supported_mechs = {};
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54 local line = conn:receive("*l");
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55 log("debug", "imap handshake: '%s'", line);
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56 if not line then
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57 return false;
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58 end
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59 local caps = line:match("^%*%s+OK%s+(%b[])");
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60 if caps then
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61 caps = caps:sub(2,-2);
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62 for cap in caps:gmatch("%S+") do
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63 log("debug", "Capability: %s", cap);
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64 local mech = cap:match("AUTH=(.*)");
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65 if mech then
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66 log("debug", "Supported SASL mechanism: %s", mech);
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67 supported_mechs[mech] = mitm[mech] and true or nil;
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68 end
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69 end
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70 end
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71
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72 return conn, supported_mechs;
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73 end
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74
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75 -- create a new SASL object which can be used to authenticate clients
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76 function _M.new(realm, service_name, host, port, ssl)
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77 log("debug", "new(%q, %q, %q, %d)", realm or "", service_name or "", host or "", port or 0);
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78 local sasl_i = {
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79 realm = realm,
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80 service_name = service_name,
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81 _host = host,
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82 _port = port,
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83 _ssl = ssl
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84 };
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85
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86 local conn, mechs = connect(host, port, ssl);
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87 if not conn then
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88 return nil, "Socket connection failure";
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89 end
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90 sasl_i.conn, sasl_i.mechs = conn, mechs;
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91 return setmetatable(sasl_i, method);
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92 end
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93
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94 -- get a fresh clone with the same realm and service name
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95 function method:clean_clone()
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96 if self.conn then
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97 self.conn:close();
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98 self.conn = nil;
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99 end
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100 log("debug", "method:clean_clone()");
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101 return _M.new(self.realm, self.service_name, self._host, self._port)
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102 end
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103
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104 -- get a list of possible SASL mechanisms to use
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105 function method:mechanisms()
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106 log("debug", "method:mechanisms()");
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107 return self.mechs;
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108 end
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109
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110 -- select a mechanism to use
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111 function method:select(mechanism)
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112 log("debug", "method:select(%q)", mechanism);
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113 if not self.selected and self.mechs[mechanism] then
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114 self.tag = tostring({}):match("0x(%x*)$");
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115 self.selected = mechanism;
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116 local selectmsg = t_concat({ self.tag, "AUTHENTICATE", mechanism }, " ");
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117 log("debug", "Sending %d bytes: %q", #selectmsg, selectmsg);
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118 local ok, err = self.conn:send(selectmsg.."\n");
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119 if not ok then
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parents:
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120 log("error", "Could not write to socket: %s", err);
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
121 return "failure", "internal-server-error", err
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
122 end
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
123 local line, err = self.conn:receive("*l");
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
124 if not line then
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
125 log("error", "Could not read from socket: %s", err);
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
126 return "failure", "internal-server-error", err
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
127 end
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
128 log("debug", "Received %d bytes: %q", #line, line);
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
129 return line:match("^+")
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
130 end
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
131 end
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
132
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
133 -- feed new messages to process into the library
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
134 function method:process(message)
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
135 local username = mitm[self.selected](message);
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
136 if username then self.username = username; end
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
137 log("debug", "method:process(%d bytes)", #message);
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
138 local ok, err = self.conn:send(b64(message).."\n");
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
139 if not ok then
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
140 log("error", "Could not write to socket: %s", err);
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
141 return "failure", "internal-server-error", err
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
142 end
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
143 log("debug", "Sent %d bytes to socket", ok);
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
144 local line, err = self.conn:receive("*l");
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
145 if not line then
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
146 log("error", "Could not read from socket: %s", err);
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
147 return "failure", "internal-server-error", err
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
148 end
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
149 log("debug", "Received %d bytes from socket: %s", #line, line);
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
150
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
151 if line:match("^%+") and #line > 2 then
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
152 local data = line:sub(3);
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
153 data = data and unb64(data);
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
154 return "challenge", unb64(data);
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
155 elseif line:sub(1, #self.tag) == self.tag then
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
156 local ok, rest = line:sub(#self.tag+1):match("(%w+)%s+(.*)");
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
157 ok = ok:lower();
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
158 log("debug", "%s: %s", ok, rest);
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
159 if ok == "ok" then
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
160 return "success"
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
161 elseif ok == "no" then
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
162 return "failure", "not-authorized", rest;
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
163 end
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
164 elseif line:match("^%* BYE") then
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
165 local err = line:match("BYE%s*(.*)");
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
166 return "failure", "not-authorized", err;
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
167 end
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
168 end
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
169
f45ca6edc159 mod_auth_imap: Authentication module that works by passing through SASL to a IMAP connection
Kim Alvefur <zash@zash.se>
parents:
diff changeset
170 return _M;