Annotate

core/certmanager.lua @ 5901:1d13f73af58e

certmanager: Default to using the server's cipher preference order by default, as clients have been shown to commonly select weak and insecure ciphers even when they support stronger ones
author Matthew Wild <mwild1@gmail.com>
date Sat, 09 Nov 2013 17:50:19 +0000
parent 5895:1b0ac7950129
child 5902:c11c0761a682
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
9a96969d4670 certmanager: Added copyright header.
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9 local configmanager = require "core.configmanager";
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10 local log = require "util.logger".init("certmanager");
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11 local ssl = ssl;
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12 local ssl_newcontext = ssl and ssl.newcontext;
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13
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14 local tostring = tostring;
5820
6bc4077bc1f9 certmanager: Fix dhparam callback, missing imports (Testing, pfft)
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15 local type = type;
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16 local io_open = io.open;
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17
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18 local prosody = prosody;
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954b1159f2f3 prosody, configmanager, certmanager: Relocate prosody.resolve_relative_path() to configmanager, and update certmanager (the only user of this function)
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19 local resolve_path = configmanager.resolve_relative_path;
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dfc369314e53 prosody.resolve_relative_path: Updated to take a parent path to resolve against.
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20 local config_path = prosody.paths.config;
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21
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22 local luasec_has_noticket, luasec_has_verifyext, luasec_has_no_compression;
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23 if ssl then
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24 local luasec_major, luasec_minor = ssl._VERSION:match("^(%d+)%.(%d+)");
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25 luasec_has_noticket = tonumber(luasec_major)>0 or tonumber(luasec_minor)>=4;
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26 luasec_has_verifyext = tonumber(luasec_major)>0 or tonumber(luasec_minor)>=5;
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27 luasec_has_no_compression = tonumber(luasec_major)>0 or tonumber(luasec_minor)>=5;
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28 end
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29
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30 module "certmanager"
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31
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32 -- Global SSL options if not overridden per-host
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33 local default_ssl_config = configmanager.get("*", "ssl");
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34 local default_capath = "/etc/ssl/certs";
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35 local default_verify = (ssl and ssl.x509 and { "peer", "client_once", }) or "none";
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36 local default_options = { "no_sslv2", "no_sslv3", luasec_has_noticket and "no_ticket" or nil, "cipher_server_preference" };
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37 local default_verifyext = { "lsec_continue", "lsec_ignore_purpose" };
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38
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39 if ssl and not luasec_has_verifyext and ssl.x509 then
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40 -- COMPAT mw/luasec-hg
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41 for i=1,#default_verifyext do -- Remove lsec_ prefix
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42 default_verify[#default_verify+1] = default_verifyext[i]:sub(6);
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43 end
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44 end
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45 if luasec_has_no_compression and configmanager.get("*", "ssl_compression") ~= true then
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46 default_options[#default_options+1] = "no_compression";
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47 end
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48
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49 if luasec_has_no_compression then -- Has no_compression? Then it has these too...
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50 default_options[#default_options+1] = "single_dh_use";
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51 default_options[#default_options+1] = "single_ecdh_use";
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52 end
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53
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54 function create_context(host, mode, user_ssl_config)
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55 user_ssl_config = user_ssl_config or default_ssl_config;
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56
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57 if not ssl then return nil, "LuaSec (required for encryption) was not found"; end
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58 if not user_ssl_config then return nil, "No SSL/TLS configuration present for "..host; end
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59
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60 local ssl_config = {
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61 mode = mode;
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62 protocol = user_ssl_config.protocol or "sslv23";
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63 key = resolve_path(config_path, user_ssl_config.key);
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64 password = user_ssl_config.password or function() log("error", "Encrypted certificate for %s requires 'ssl' 'password' to be set in config", host); end;
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65 certificate = resolve_path(config_path, user_ssl_config.certificate);
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66 capath = resolve_path(config_path, user_ssl_config.capath or default_capath);
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67 cafile = resolve_path(config_path, user_ssl_config.cafile);
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68 verify = user_ssl_config.verify or default_verify;
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69 verifyext = user_ssl_config.verifyext or default_verifyext;
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70 options = user_ssl_config.options or default_options;
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71 depth = user_ssl_config.depth;
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c1021a2e7071 certmanager: Set ssl.curve to 'secp384r1' by default, to enable ECC ciphers
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72 curve = user_ssl_config.curve or "secp384r1";
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a1b0cfebeeba certmanager: Set our own default cipher string, which includes only ciphers regarded as 'HIGH' strength (by OpenSSL). In particular this disables RC4.
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73 ciphers = user_ssl_config.ciphers or "HIGH:!DSS:!aNULL@STRENGTH";
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74 dhparam = user_ssl_config.dhparam;
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75 };
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76
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77 -- LuaSec expects dhparam to be a callback that takes two arguments.
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78 -- We ignore those because it is mostly used for having a separate
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79 -- set of params for EXPORT ciphers, which we don't have by default.
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80 if type(ssl_config.dhparam) == "string" then
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81 local f, err = io_open(resolve_path(config_path, ssl_config.dhparam));
5816
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82 if not f then return nil, "Could not open DH parameters: "..err end
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83 local dhparam = f:read("*a");
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84 f:close();
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85 ssl_config.dhparam = function() return dhparam; end
5816
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86 end
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87
3355
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88 local ctx, err = ssl_newcontext(ssl_config);
4359
c69cbac4178f certmanager: Support setting ciphers in SSL config. LuaSec apparently ignores the documented ciphers option.
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89
5815
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Matthew Wild <mwild1@gmail.com>
parents: 5745
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90 -- COMPAT: LuaSec 0.4.1 ignores the cipher list from the config, so we have to take
b93d096607b4 certmanager: Fix for working around a bug with LuaSec 0.4.1 that causes it to not honour the 'ciphers' option. This change will apply 0.9's default cipher string for LuaSec 0.4.1 users.
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parents: 5745
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91 -- care of it ourselves...
b93d096607b4 certmanager: Fix for working around a bug with LuaSec 0.4.1 that causes it to not honour the 'ciphers' option. This change will apply 0.9's default cipher string for LuaSec 0.4.1 users.
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92 if ctx and ssl_config.ciphers then
4359
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93 local success;
5815
b93d096607b4 certmanager: Fix for working around a bug with LuaSec 0.4.1 that causes it to not honour the 'ciphers' option. This change will apply 0.9's default cipher string for LuaSec 0.4.1 users.
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parents: 5745
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94 success, err = ssl.context.setcipher(ctx, ssl_config.ciphers);
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c69cbac4178f certmanager: Support setting ciphers in SSL config. LuaSec apparently ignores the documented ciphers option.
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95 if not success then ctx = nil; end
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96 end
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97
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98 if not ctx then
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99 err = err or "invalid ssl config"
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100 local file = err:match("^error loading (.-) %(");
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101 if file then
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102 if file == "private key" then
9bb2da325d4d certmanager: Adjust paths of SSL key/certs to be relative to the config file, fixes #147
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parents: 2739
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103 file = ssl_config.key or "your private key";
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104 elseif file == "certificate" then
9bb2da325d4d certmanager: Adjust paths of SSL key/certs to be relative to the config file, fixes #147
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105 file = ssl_config.certificate or "your certificate file";
9bb2da325d4d certmanager: Adjust paths of SSL key/certs to be relative to the config file, fixes #147
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106 end
9bb2da325d4d certmanager: Adjust paths of SSL key/certs to be relative to the config file, fixes #147
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107 local reason = err:match("%((.+)%)$") or "some reason";
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108 if reason == "Permission denied" then
9bb2da325d4d certmanager: Adjust paths of SSL key/certs to be relative to the config file, fixes #147
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109 reason = "Check that the permissions allow Prosody to read this file.";
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110 elseif reason == "No such file or directory" then
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111 reason = "Check that the path is correct, and the file exists.";
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112 elseif reason == "system lib" then
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113 reason = "Previous error (see logs), or other system error.";
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114 elseif reason == "(null)" or not reason then
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115 reason = "Check that the file exists and the permissions are correct";
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116 else
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117 reason = "Reason: "..tostring(reason):lower();
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118 end
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119 log("error", "SSL/TLS: Failed to load '%s': %s (for %s)", file, reason, host);
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120 else
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121 log("error", "SSL/TLS: Error initialising for %s: %s", host, err);
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122 end
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123 end
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124 return ctx, err;
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125 end
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126
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127 function reload_ssl_config()
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128 default_ssl_config = configmanager.get("*", "ssl");
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129 end
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130
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131 prosody.events.add_handler("config-reloaded", reload_ssl_config);
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132
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133 return _M;