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annotate mod_auth_cyrus/sasl_cyrus.lua @ 4740:beeacb25dea9

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mod_rest: Add XEP-0004 mapping for future reuse For use with MAM and such
author Kim Alvefur <zash@zash.se>
date Thu, 04 Nov 2021 19:36:11 +0100
parents 099dcdb732b1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
4710
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1 -- sasl.lua v0.4
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2 -- Copyright (C) 2008-2009 Tobias Markmann
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3 --
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4 -- All rights reserved.
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5 --
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6 -- Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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7 --
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8 -- * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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9 -- * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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10 -- * Neither the name of Tobias Markmann nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
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11 --
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12 -- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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13
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14 local cyrussasl = require "cyrussasl";
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15 local log = require "util.logger".init("sasl_cyrus");
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16
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17 local setmetatable = setmetatable
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18
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19 local pcall = pcall
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20 local s_match, s_gmatch = string.match, string.gmatch
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21
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22 local sasl_errstring = {
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23 -- SASL result codes --
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24 [1] = "another step is needed in authentication";
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25 [0] = "successful result";
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26 [-1] = "generic failure";
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27 [-2] = "memory shortage failure";
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28 [-3] = "overflowed buffer";
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29 [-4] = "mechanism not supported";
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30 [-5] = "bad protocol / cancel";
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31 [-6] = "can't request info until later in exchange";
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32 [-7] = "invalid parameter supplied";
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33 [-8] = "transient failure (e.g., weak key)";
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34 [-9] = "integrity check failed";
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35 [-12] = "SASL library not initialized";
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36
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37 -- client only codes --
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38 [2] = "needs user interaction";
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39 [-10] = "server failed mutual authentication step";
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40 [-11] = "mechanism doesn't support requested feature";
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41
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42 -- server only codes --
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43 [-13] = "authentication failure";
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44 [-14] = "authorization failure";
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45 [-15] = "mechanism too weak for this user";
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46 [-16] = "encryption needed to use mechanism";
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47 [-17] = "One time use of a plaintext password will enable requested mechanism for user";
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48 [-18] = "passphrase expired, has to be reset";
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49 [-19] = "account disabled";
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50 [-20] = "user not found";
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51 [-23] = "version mismatch with plug-in";
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52 [-24] = "remote authentication server unavailable";
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53 [-26] = "user exists, but no verifier for user";
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54
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55 -- codes for password setting --
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56 [-21] = "passphrase locked";
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57 [-22] = "requested change was not needed";
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58 [-27] = "passphrase is too weak for security policy";
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59 [-28] = "user supplied passwords not permitted";
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60 };
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61 setmetatable(sasl_errstring, { __index = function() return "undefined error!" end });
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62
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63 local _ENV = nil;
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64 -- luacheck: std none
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65
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66 local method = {};
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67 method.__index = method;
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68 local initialized = false;
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69
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70 local function init(service_name)
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71 if not initialized then
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72 local st, errmsg = pcall(cyrussasl.server_init, service_name);
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73 if st then
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74 initialized = true;
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75 else
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76 log("error", "Failed to initialize Cyrus SASL: %s", errmsg);
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77 end
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78 end
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79 end
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80
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81 -- create a new SASL object which can be used to authenticate clients
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82 -- host_fqdn may be nil in which case gethostname() gives the value.
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83 -- For GSSAPI, this determines the hostname in the service ticket (after
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84 -- reverse DNS canonicalization, only if [libdefaults] rdns = true which
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85 -- is the default).
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86 local function new(realm, service_name, app_name, host_fqdn)
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87
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88 init(app_name or service_name);
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89
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90 local st, ret = pcall(cyrussasl.server_new, service_name, host_fqdn, realm, nil, nil)
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91 if not st then
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92 log("error", "Creating SASL server connection failed: %s", ret);
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93 return nil;
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94 end
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95
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96 local sasl_i = { realm = realm, service_name = service_name, cyrus = ret };
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97
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98 if cyrussasl.set_canon_cb then
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99 local c14n_cb = function (user)
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100 local node = s_match(user, "^([^@]+)");
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101 log("debug", "Canonicalizing username %s to %s", user, node)
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102 return node
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103 end
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104 cyrussasl.set_canon_cb(sasl_i.cyrus, c14n_cb);
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105 end
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106
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107 cyrussasl.setssf(sasl_i.cyrus, 0, 0xffffffff)
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108 local mechanisms = {};
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109 local cyrus_mechs = cyrussasl.listmech(sasl_i.cyrus, nil, "", " ", "");
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110 for w in s_gmatch(cyrus_mechs, "[^ ]+") do
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111 mechanisms[w] = true;
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112 end
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113 sasl_i.mechs = mechanisms;
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114 return setmetatable(sasl_i, method);
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115 end
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116
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
117 -- get a fresh clone with the same realm and service name
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
118 function method:clean_clone()
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
119 return new(self.realm, self.service_name)
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
120 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
121
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
122 -- get a list of possible SASL mechanims to use
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
123 function method:mechanisms()
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
124 return self.mechs;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
125 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
126
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
127 -- select a mechanism to use
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
128 function method:select(mechanism)
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
129 if not self.selected and self.mechs[mechanism] then
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
130 self.selected = mechanism;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
131 return true;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
132 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
133 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
134
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
135 -- feed new messages to process into the library
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
136 function method:process(message)
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
137 local err;
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
138 local data;
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
139
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
140 if not self.first_step_done then
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
141 err, data = cyrussasl.server_start(self.cyrus, self.selected, message or "")
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
142 self.first_step_done = true;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
143 else
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
144 err, data = cyrussasl.server_step(self.cyrus, message or "")
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
145 end
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
146
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
147 self.username = cyrussasl.get_username(self.cyrus)
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
148
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
149 if (err == 0) then -- SASL_OK
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
150 if self.require_provisioning and not self.require_provisioning(self.username) then
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
151 return "failure", "not-authorized", "User authenticated successfully, but not provisioned for XMPP";
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
152 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
153 return "success", data
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
154 elseif (err == 1) then -- SASL_CONTINUE
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
155 return "challenge", data
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
156 elseif (err == -4) then -- SASL_NOMECH
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
157 log("debug", "SASL mechanism not available from remote end")
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
158 return "failure", "invalid-mechanism", "SASL mechanism not available"
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
159 elseif (err == -13) then -- SASL_BADAUTH
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
160 return "failure", "not-authorized", sasl_errstring[err];
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
161 else
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
162 log("debug", "Got SASL error condition %d: %s", err, sasl_errstring[err]);
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
163 return "failure", "undefined-condition", sasl_errstring[err];
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
164 end
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
165 end
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
166
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
167 return {
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
168 new = new;
099dcdb732b1 mod_auth_cyrus: Import from Prosody rev 8f1e7fd55e7b
Kim Alvefur <zash@zash.se>
parents:
diff changeset
169 };