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72f7bb3f30d3
net/resolvers/basic.lua

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net/resolvers/basic.lua @ 12601:72f7bb3f30d3

net.resolvers.basic: Add opt-out argument for DNSSEC security status This makes explicit which lookups can accept an unsigned response. Insecure (unsigned, as before DNSSEC) A and AAAA records can be used as security would come from TLS, but an insecure TLSA record is worthless.
author Kim Alvefur <zash@zash.se>
date Tue, 02 Aug 2022 16:08:43 +0200
parent 12413:e155f4509954
child 12815:2d134201dc55
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 local adns = require "net.adns";
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2 local inet_pton = require "util.net".pton;
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3 local inet_ntop = require "util.net".ntop;
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4 local idna_to_ascii = require "util.encodings".idna.to_ascii;
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5 local promise = require "util.promise";
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6 local t_move = require "util.table".move;
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7
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8 local methods = {};
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9 local resolver_mt = { __index = methods };
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10
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11 -- FIXME RFC 6724
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12
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13 local function do_dns_lookup(self, dns_resolver, record_type, name, allow_insecure)
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14 return promise.new(function (resolve, reject)
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15 local ipv = (record_type == "A" and "4") or (record_type == "AAAA" and "6") or nil;
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16 if ipv and self.extra["use_ipv"..ipv] == false then
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17 return reject(("IPv%s disabled - %s lookup skipped"):format(ipv, record_type));
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18 elseif record_type == "TLSA" and self.extra.use_dane ~= true then
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19 return reject("DANE disabled - TLSA lookup skipped");
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20 end
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21 dns_resolver:lookup(function (answer, err)
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22 if not answer then
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23 return reject(err);
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24 elseif answer.bogus then
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25 return reject(("Validation error in %s lookup"):format(record_type));
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26 elseif not (answer.secure or allow_insecure) then
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27 return reject(("Insecure response in %s lookup"):format(record_type));
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28 elseif answer.status and #answer == 0 then
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29 return reject(("%s in %s lookup"):format(answer.status, record_type));
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30 end
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31
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32 local targets = { secure = answer.secure };
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33 for _, record in ipairs(answer) do
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34 if ipv then
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35 table.insert(targets, { self.conn_type..ipv, record[record_type:lower()], self.port, self.extra });
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36 else
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37 table.insert(targets, record[record_type:lower()]);
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38 end
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39 end
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40 return resolve(targets);
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41 end, name, record_type, "IN");
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42 end);
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43 end
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44
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45 local function merge_targets(ipv4_targets, ipv6_targets)
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46 local result = { secure = ipv4_targets.secure and ipv6_targets.secure };
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47 local common_length = math.min(#ipv4_targets, #ipv6_targets);
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48 for i = 1, common_length do
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49 table.insert(result, ipv6_targets[i]);
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50 table.insert(result, ipv4_targets[i]);
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51 end
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52 if common_length < #ipv4_targets then
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53 t_move(ipv4_targets, common_length+1, #ipv4_targets, common_length+1, result);
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54 elseif common_length < #ipv6_targets then
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55 t_move(ipv6_targets, common_length+1, #ipv6_targets, common_length+1, result);
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56 end
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57 return result;
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58 end
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59
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60 -- Find the next target to connect to, and
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61 -- pass it to cb()
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62 function methods:next(cb)
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63 if self.targets then
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64 if #self.targets == 0 then
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65 cb(nil);
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66 return;
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67 end
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68 local next_target = table.remove(self.targets, 1);
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69 cb(next_target[1], next_target[2], next_target[3], next_target[4], not not self.targets[1]);
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70 return;
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71 end
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72
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73 if not self.hostname then
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74 self.last_error = "hostname failed IDNA";
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75 cb(nil);
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76 return;
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77 end
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78
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79 -- Resolve DNS to target list
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80 local dns_resolver = adns.resolver();
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81
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82 local dns_lookups = {
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83 ipv4 = do_dns_lookup(self, dns_resolver, "A", self.hostname, true);
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84 ipv6 = do_dns_lookup(self, dns_resolver, "AAAA", self.hostname, true);
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85 tlsa = do_dns_lookup(self, dns_resolver, "TLSA", ("_%d._%s.%s"):format(self.port, self.conn_type, self.hostname));
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86 };
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87
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88 promise.all_settled(dns_lookups):next(function (dns_results)
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89 -- Combine targets, assign to self.targets, self:next(cb)
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90 local have_ipv4 = dns_results.ipv4.status == "fulfilled";
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91 local have_ipv6 = dns_results.ipv6.status == "fulfilled";
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92
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93 if have_ipv4 and have_ipv6 then
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94 self.targets = merge_targets(dns_results.ipv4.value, dns_results.ipv6.value);
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95 elseif have_ipv4 then
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96 self.targets = dns_results.ipv4.value;
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97 elseif have_ipv6 then
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98 self.targets = dns_results.ipv6.value;
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99 else
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100 self.targets = {};
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101 end
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102
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103 if self.extra and self.extra.use_dane then
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104 if self.targets.secure and dns_results.tlsa.status == "fulfilled" then
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105 self.extra.tlsa = dns_results.tlsa.value;
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106 self.extra.dane_hostname = self.hostname;
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107 else
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108 self.extra.tlsa = nil;
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109 self.extra.dane_hostname = nil;
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110 end
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111 end
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112
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113 self:next(cb);
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114 end):catch(function (err)
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115 self.last_error = err;
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116 self.targets = {};
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117 end);
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118 end
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119
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120 local function new(hostname, port, conn_type, extra)
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121 local ascii_host = idna_to_ascii(hostname);
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122 local targets = nil;
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123 conn_type = conn_type or "tcp";
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124
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125 local is_ip = inet_pton(hostname);
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126 if not is_ip and hostname:sub(1,1) == '[' then
fcfc8f4d14a8 net.resolvers.basic: Fix resolution of IPv6 literals (in brackets) (fixes #1459)
Kim Alvefur <zash@zash.se>
parents: 10436
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127 is_ip = inet_pton(hostname:sub(2,-2));
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parents: 10436
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128 end
10436
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parents: 10400
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129 if is_ip then
10439
97c0f5fe5f41 net.resolvers.basic: Normalise IP literals, ensures net.server is happy
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parents: 10437
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130 hostname = inet_ntop(is_ip);
10436
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parents: 10400
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131 if #is_ip == 16 then
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parents: 10400
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132 targets = { { conn_type.."6", hostname, port, extra } };
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parents: 10400
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133 elseif #is_ip == 4 then
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parents: 10400
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134 targets = { { conn_type.."4", hostname, port, extra } };
0d702ec77f0c net.resolvers.basic: Move IP literal check to constructor
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parents: 10400
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135 end
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parents: 10400
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136 end
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parents: 10400
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137
8531
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
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138 return setmetatable({
10436
0d702ec77f0c net.resolvers.basic: Move IP literal check to constructor
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parents: 10400
diff changeset
139 hostname = ascii_host;
8531
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
140 port = port;
11007
1d8e1f7a587c net.resolvers.basic: Default conn_type to 'tcp' consistently if unspecified (thanks marc0s)
Matthew Wild <mwild1@gmail.com>
parents: 10439
diff changeset
141 conn_type = conn_type;
12408
acfc51b9530c net.resolvers.basic: Refactor to remove code duplication
Matthew Wild <mwild1@gmail.com>
parents: 12129
diff changeset
142 extra = extra or {};
10436
0d702ec77f0c net.resolvers.basic: Move IP literal check to constructor
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parents: 10400
diff changeset
143 targets = targets;
8531
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parents:
diff changeset
144 }, resolver_mt);
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Matthew Wild <mwild1@gmail.com>
parents:
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145 end
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
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146
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parents:
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147 return {
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
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parents:
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148 new = new;
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
149 };