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util/x509.lua @ 6319:92d009af6eba
mod_s2s_auth_certs: Split PKIX based certificate checking from mod_s2s into new plugin
| author | Kim Alvefur <zash@zash.se> |
|---|---|
| date | Fri, 25 Jul 2014 20:41:54 +0200 |
| parent | 6153:8fb54ec34741 |
| child | 6708:d2beb98ece29 |
| rev | line source |
|---|---|
| 3651 | 1 -- Prosody IM |
| 2 -- Copyright (C) 2010 Matthew Wild | |
| 3 -- Copyright (C) 2010 Paul Aurich | |
| 4 -- | |
| 5 -- This project is MIT/X11 licensed. Please see the | |
| 6 -- COPYING file in the source package for more information. | |
| 7 -- | |
| 8 | |
| 9 -- TODO: I feel a fair amount of this logic should be integrated into Luasec, | |
| 10 -- so that everyone isn't re-inventing the wheel. Dependencies on | |
| 11 -- IDN libraries complicate that. | |
| 12 | |
| 13 | |
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14 -- [TLS-CERTS] - http://tools.ietf.org/html/rfc6125 |
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15 -- [XMPP-CORE] - http://tools.ietf.org/html/rfc6120 |
| 3651 | 16 -- [SRV-ID] - http://tools.ietf.org/html/rfc4985 |
| 17 -- [IDNA] - http://tools.ietf.org/html/rfc5890 | |
| 18 -- [LDAP] - http://tools.ietf.org/html/rfc4519 | |
| 19 -- [PKIX] - http://tools.ietf.org/html/rfc5280 | |
| 20 | |
| 21 local nameprep = require "util.encodings".stringprep.nameprep; | |
| 22 local idna_to_ascii = require "util.encodings".idna.to_ascii; | |
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23 local base64 = require "util.encodings".base64; |
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24 local log = require "util.logger".init("x509"); |
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25 local s_format = string.format; |
| 3651 | 26 |
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27 module "x509" |
| 3651 | 28 |
| 29 local oid_commonname = "2.5.4.3"; -- [LDAP] 2.3 | |
| 30 local oid_subjectaltname = "2.5.29.17"; -- [PKIX] 4.2.1.6 | |
| 31 local oid_xmppaddr = "1.3.6.1.5.5.7.8.5"; -- [XMPP-CORE] | |
| 32 local oid_dnssrv = "1.3.6.1.5.5.7.8.7"; -- [SRV-ID] | |
| 33 | |
| 34 -- Compare a hostname (possibly international) with asserted names | |
| 35 -- extracted from a certificate. | |
| 36 -- This function follows the rules laid out in | |
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37 -- sections 6.4.1 and 6.4.2 of [TLS-CERTS] |
| 3651 | 38 -- |
| 39 -- A wildcard ("*") all by itself is allowed only as the left-most label | |
| 40 local function compare_dnsname(host, asserted_names) | |
| 41 -- TODO: Sufficient normalization? Review relevant specs. | |
| 42 local norm_host = idna_to_ascii(host) | |
| 43 if norm_host == nil then | |
| 44 log("info", "Host %s failed IDNA ToASCII operation", host) | |
| 45 return false | |
| 46 end | |
| 47 | |
| 48 norm_host = norm_host:lower() | |
| 49 | |
| 50 local host_chopped = norm_host:gsub("^[^.]+%.", "") -- everything after the first label | |
| 51 | |
| 52 for i=1,#asserted_names do | |
| 53 local name = asserted_names[i] | |
| 54 if norm_host == name:lower() then | |
| 55 log("debug", "Cert dNSName %s matched hostname", name); | |
| 56 return true | |
| 57 end | |
| 58 | |
| 59 -- Allow the left most label to be a "*" | |
| 60 if name:match("^%*%.") then | |
| 61 local rest_name = name:gsub("^[^.]+%.", "") | |
| 62 if host_chopped == rest_name:lower() then | |
| 63 log("debug", "Cert dNSName %s matched hostname", name); | |
| 64 return true | |
| 65 end | |
| 66 end | |
| 67 end | |
| 68 | |
| 69 return false | |
| 70 end | |
| 71 | |
| 72 -- Compare an XMPP domain name with the asserted id-on-xmppAddr | |
| 73 -- identities extracted from a certificate. Both are UTF8 strings. | |
| 74 -- | |
| 75 -- Per [XMPP-CORE], matches against asserted identities don't include | |
| 76 -- wildcards, so we just do a normalize on both and then a string comparison | |
| 77 -- | |
| 78 -- TODO: Support for full JIDs? | |
| 79 local function compare_xmppaddr(host, asserted_names) | |
| 80 local norm_host = nameprep(host) | |
| 81 | |
| 82 for i=1,#asserted_names do | |
| 83 local name = asserted_names[i] | |
| 84 | |
| 85 -- We only want to match against bare domains right now, not | |
| 86 -- those crazy full-er JIDs. | |
| 87 if name:match("[@/]") then | |
| 88 log("debug", "Ignoring xmppAddr %s because it's not a bare domain", name) | |
| 89 else | |
| 90 local norm_name = nameprep(name) | |
| 91 if norm_name == nil then | |
| 92 log("info", "Ignoring xmppAddr %s, failed nameprep!", name) | |
| 93 else | |
| 94 if norm_host == norm_name then | |
| 95 log("debug", "Cert xmppAddr %s matched hostname", name) | |
| 96 return true | |
| 97 end | |
| 98 end | |
| 99 end | |
| 100 end | |
| 101 | |
| 102 return false | |
| 103 end | |
| 104 | |
| 105 -- Compare a host + service against the asserted id-on-dnsSRV (SRV-ID) | |
| 106 -- identities extracted from a certificate. | |
| 107 -- | |
| 108 -- Per [SRV-ID], the asserted identities will be encoded in ASCII via ToASCII. | |
| 109 -- Comparison is done case-insensitively, and a wildcard ("*") all by itself | |
| 110 -- is allowed only as the left-most non-service label. | |
| 111 local function compare_srvname(host, service, asserted_names) | |
| 112 local norm_host = idna_to_ascii(host) | |
| 113 if norm_host == nil then | |
| 114 log("info", "Host %s failed IDNA ToASCII operation", host); | |
| 115 return false | |
| 116 end | |
| 117 | |
| 118 -- Service names start with a "_" | |
| 119 if service:match("^_") == nil then service = "_"..service end | |
| 120 | |
| 121 norm_host = norm_host:lower(); | |
| 122 local host_chopped = norm_host:gsub("^[^.]+%.", "") -- everything after the first label | |
| 123 | |
| 124 for i=1,#asserted_names do | |
| 125 local asserted_service, name = asserted_names[i]:match("^(_[^.]+)%.(.*)"); | |
| 126 if service == asserted_service then | |
| 127 if norm_host == name:lower() then | |
| 128 log("debug", "Cert SRVName %s matched hostname", name); | |
| 129 return true; | |
| 130 end | |
| 131 | |
| 132 -- Allow the left most label to be a "*" | |
| 133 if name:match("^%*%.") then | |
| 134 local rest_name = name:gsub("^[^.]+%.", "") | |
| 135 if host_chopped == rest_name:lower() then | |
| 136 log("debug", "Cert SRVName %s matched hostname", name) | |
| 137 return true | |
| 138 end | |
| 139 end | |
| 140 if norm_host == name:lower() then | |
| 141 log("debug", "Cert SRVName %s matched hostname", name); | |
| 142 return true | |
| 143 end | |
| 144 end | |
| 145 end | |
| 146 | |
| 147 return false | |
| 148 end | |
| 149 | |
| 150 function verify_identity(host, service, cert) | |
| 151 local ext = cert:extensions() | |
| 152 if ext[oid_subjectaltname] then | |
| 153 local sans = ext[oid_subjectaltname]; | |
| 154 | |
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155 -- Per [TLS-CERTS] 6.3, 6.4.4, "a client MUST NOT seek a match for a |
| 3651 | 156 -- reference identifier if the presented identifiers include a DNS-ID |
| 157 -- SRV-ID, URI-ID, or any application-specific identifier types" | |
| 158 local had_supported_altnames = false | |
| 159 | |
| 160 if sans[oid_xmppaddr] then | |
| 161 had_supported_altnames = true | |
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162 if service == "_xmpp-client" or service == "_xmpp-server" then |
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163 if compare_xmppaddr(host, sans[oid_xmppaddr]) then return true end |
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164 end |
| 3651 | 165 end |
| 166 | |
| 167 if sans[oid_dnssrv] then | |
| 168 had_supported_altnames = true | |
| 169 -- Only check srvNames if the caller specified a service | |
| 170 if service and compare_srvname(host, service, sans[oid_dnssrv]) then return true end | |
| 171 end | |
| 172 | |
| 173 if sans["dNSName"] then | |
| 174 had_supported_altnames = true | |
| 175 if compare_dnsname(host, sans["dNSName"]) then return true end | |
| 176 end | |
| 177 | |
| 178 -- We don't need URIs, but [TLS-CERTS] is clear. | |
| 179 if sans["uniformResourceIdentifier"] then | |
| 180 had_supported_altnames = true | |
| 181 end | |
| 182 | |
| 183 if had_supported_altnames then return false end | |
| 184 end | |
| 185 | |
| 186 -- Extract a common name from the certificate, and check it as if it were | |
| 187 -- a dNSName subjectAltName (wildcards may apply for, and receive, | |
| 188 -- cat treats) | |
| 189 -- | |
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190 -- Per [TLS-CERTS] 1.8, a CN-ID is the Common Name from a cert subject |
| 3651 | 191 -- which has one and only one Common Name |
| 192 local subject = cert:subject() | |
| 193 local cn = nil | |
| 194 for i=1,#subject do | |
| 195 local dn = subject[i] | |
| 196 if dn["oid"] == oid_commonname then | |
| 197 if cn then | |
| 198 log("info", "Certificate has multiple common names") | |
| 199 return false | |
| 200 end | |
| 201 | |
| 202 cn = dn["value"]; | |
| 203 end | |
| 204 end | |
| 205 | |
| 206 if cn then | |
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207 -- Per [TLS-CERTS] 6.4.4, follow the comparison rules for dNSName SANs. |
| 3651 | 208 return compare_dnsname(host, { cn }) |
| 209 end | |
| 210 | |
| 211 -- If all else fails, well, why should we be any different? | |
| 212 return false | |
| 213 end | |
| 214 | |
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215 local pat = "%-%-%-%-%-BEGIN ([A-Z ]+)%-%-%-%-%-\r?\n".. |
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216 "([0-9A-Za-z+/=\r\n]*)\r?\n%-%-%-%-%-END %1%-%-%-%-%-"; |
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217 |
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218 function pem2der(pem) |
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219 local typ, data = pem:match(pat); |
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220 if typ and data then |
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221 return base64.decode(data), typ; |
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222 end |
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223 end |
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224 |
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225 local wrap = ('.'):rep(64); |
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226 local envelope = "-----BEGIN %s-----\n%s\n-----END %s-----\n" |
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227 |
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228 function der2pem(data, typ) |
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229 typ = typ and typ:upper() or "CERTIFICATE"; |
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230 data = base64.encode(data); |
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231 return s_format(envelope, typ, data:gsub(wrap, '%0\n', (#data-1)/64), typ); |
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232 end |
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233 |
| 3651 | 234 return _M; |
