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util/x509.lua @ 11992:876e1b6d6ae4
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| author | Kim Alvefur <zash@zash.se> |
|---|---|
| date | Tue, 30 Nov 2021 00:52:07 +0100 |
| parent | 10494:69e55b03d5cf |
| child | 12106:c0cb8e86ad21 |
| 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 idna_to_unicode = require "util.encodings".idna.to_unicode; |
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24 local base64 = require "util.encodings".base64; |
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25 local log = require "util.logger".init("x509"); |
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26 local mt = require "util.multitable"; |
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27 local s_format = string.format; |
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28 local ipairs = ipairs; |
| 3651 | 29 |
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30 local _ENV = nil; |
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31 -- luacheck: std none |
| 3651 | 32 |
| 33 local oid_commonname = "2.5.4.3"; -- [LDAP] 2.3 | |
| 34 local oid_subjectaltname = "2.5.29.17"; -- [PKIX] 4.2.1.6 | |
| 35 local oid_xmppaddr = "1.3.6.1.5.5.7.8.5"; -- [XMPP-CORE] | |
| 36 local oid_dnssrv = "1.3.6.1.5.5.7.8.7"; -- [SRV-ID] | |
| 37 | |
| 38 -- Compare a hostname (possibly international) with asserted names | |
| 39 -- extracted from a certificate. | |
| 40 -- This function follows the rules laid out in | |
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41 -- sections 6.4.1 and 6.4.2 of [TLS-CERTS] |
| 3651 | 42 -- |
| 43 -- A wildcard ("*") all by itself is allowed only as the left-most label | |
| 44 local function compare_dnsname(host, asserted_names) | |
| 45 -- TODO: Sufficient normalization? Review relevant specs. | |
| 46 local norm_host = idna_to_ascii(host) | |
| 47 if norm_host == nil then | |
| 48 log("info", "Host %s failed IDNA ToASCII operation", host) | |
| 49 return false | |
| 50 end | |
| 51 | |
| 52 norm_host = norm_host:lower() | |
| 53 | |
| 54 local host_chopped = norm_host:gsub("^[^.]+%.", "") -- everything after the first label | |
| 55 | |
| 56 for i=1,#asserted_names do | |
| 57 local name = asserted_names[i] | |
| 58 if norm_host == name:lower() then | |
| 59 log("debug", "Cert dNSName %s matched hostname", name); | |
| 60 return true | |
| 61 end | |
| 62 | |
| 63 -- Allow the left most label to be a "*" | |
| 64 if name:match("^%*%.") then | |
| 65 local rest_name = name:gsub("^[^.]+%.", "") | |
| 66 if host_chopped == rest_name:lower() then | |
| 67 log("debug", "Cert dNSName %s matched hostname", name); | |
| 68 return true | |
| 69 end | |
| 70 end | |
| 71 end | |
| 72 | |
| 73 return false | |
| 74 end | |
| 75 | |
| 76 -- Compare an XMPP domain name with the asserted id-on-xmppAddr | |
| 77 -- identities extracted from a certificate. Both are UTF8 strings. | |
| 78 -- | |
| 79 -- Per [XMPP-CORE], matches against asserted identities don't include | |
| 80 -- wildcards, so we just do a normalize on both and then a string comparison | |
| 81 -- | |
| 82 -- TODO: Support for full JIDs? | |
| 83 local function compare_xmppaddr(host, asserted_names) | |
| 84 local norm_host = nameprep(host) | |
| 85 | |
| 86 for i=1,#asserted_names do | |
| 87 local name = asserted_names[i] | |
| 88 | |
| 89 -- We only want to match against bare domains right now, not | |
| 90 -- those crazy full-er JIDs. | |
| 91 if name:match("[@/]") then | |
| 92 log("debug", "Ignoring xmppAddr %s because it's not a bare domain", name) | |
| 93 else | |
| 94 local norm_name = nameprep(name) | |
| 95 if norm_name == nil then | |
| 96 log("info", "Ignoring xmppAddr %s, failed nameprep!", name) | |
| 97 else | |
| 98 if norm_host == norm_name then | |
| 99 log("debug", "Cert xmppAddr %s matched hostname", name) | |
| 100 return true | |
| 101 end | |
| 102 end | |
| 103 end | |
| 104 end | |
| 105 | |
| 106 return false | |
| 107 end | |
| 108 | |
| 109 -- Compare a host + service against the asserted id-on-dnsSRV (SRV-ID) | |
| 110 -- identities extracted from a certificate. | |
| 111 -- | |
| 112 -- Per [SRV-ID], the asserted identities will be encoded in ASCII via ToASCII. | |
| 113 -- Comparison is done case-insensitively, and a wildcard ("*") all by itself | |
| 114 -- is allowed only as the left-most non-service label. | |
| 115 local function compare_srvname(host, service, asserted_names) | |
| 116 local norm_host = idna_to_ascii(host) | |
| 117 if norm_host == nil then | |
| 118 log("info", "Host %s failed IDNA ToASCII operation", host); | |
| 119 return false | |
| 120 end | |
| 121 | |
| 122 -- Service names start with a "_" | |
| 123 if service:match("^_") == nil then service = "_"..service end | |
| 124 | |
| 125 norm_host = norm_host:lower(); | |
| 126 local host_chopped = norm_host:gsub("^[^.]+%.", "") -- everything after the first label | |
| 127 | |
| 128 for i=1,#asserted_names do | |
| 129 local asserted_service, name = asserted_names[i]:match("^(_[^.]+)%.(.*)"); | |
| 130 if service == asserted_service then | |
| 131 if norm_host == name:lower() then | |
| 132 log("debug", "Cert SRVName %s matched hostname", name); | |
| 133 return true; | |
| 134 end | |
| 135 | |
| 136 -- Allow the left most label to be a "*" | |
| 137 if name:match("^%*%.") then | |
| 138 local rest_name = name:gsub("^[^.]+%.", "") | |
| 139 if host_chopped == rest_name:lower() then | |
| 140 log("debug", "Cert SRVName %s matched hostname", name) | |
| 141 return true | |
| 142 end | |
| 143 end | |
| 144 if norm_host == name:lower() then | |
| 145 log("debug", "Cert SRVName %s matched hostname", name); | |
| 146 return true | |
| 147 end | |
| 148 end | |
| 149 end | |
| 150 | |
| 151 return false | |
| 152 end | |
| 153 | |
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154 local function verify_identity(host, service, cert) |
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155 if cert.setencode then |
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156 cert:setencode("utf8"); |
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157 end |
| 3651 | 158 local ext = cert:extensions() |
| 159 if ext[oid_subjectaltname] then | |
| 160 local sans = ext[oid_subjectaltname]; | |
| 161 | |
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162 -- Per [TLS-CERTS] 6.3, 6.4.4, "a client MUST NOT seek a match for a |
| 3651 | 163 -- reference identifier if the presented identifiers include a DNS-ID |
| 164 -- SRV-ID, URI-ID, or any application-specific identifier types" | |
| 165 local had_supported_altnames = false | |
| 166 | |
| 167 if sans[oid_xmppaddr] then | |
| 168 had_supported_altnames = true | |
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169 if service == "_xmpp-client" or service == "_xmpp-server" then |
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170 if compare_xmppaddr(host, sans[oid_xmppaddr]) then return true end |
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171 end |
| 3651 | 172 end |
| 173 | |
| 174 if sans[oid_dnssrv] then | |
| 175 had_supported_altnames = true | |
| 176 -- Only check srvNames if the caller specified a service | |
| 177 if service and compare_srvname(host, service, sans[oid_dnssrv]) then return true end | |
| 178 end | |
| 179 | |
| 180 if sans["dNSName"] then | |
| 181 had_supported_altnames = true | |
| 182 if compare_dnsname(host, sans["dNSName"]) then return true end | |
| 183 end | |
| 184 | |
| 185 -- We don't need URIs, but [TLS-CERTS] is clear. | |
| 186 if sans["uniformResourceIdentifier"] then | |
| 187 had_supported_altnames = true | |
| 188 end | |
| 189 | |
| 190 if had_supported_altnames then return false end | |
| 191 end | |
| 192 | |
| 193 -- Extract a common name from the certificate, and check it as if it were | |
| 194 -- a dNSName subjectAltName (wildcards may apply for, and receive, | |
| 195 -- cat treats) | |
| 196 -- | |
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197 -- Per [TLS-CERTS] 1.8, a CN-ID is the Common Name from a cert subject |
| 3651 | 198 -- which has one and only one Common Name |
| 199 local subject = cert:subject() | |
| 200 local cn = nil | |
| 201 for i=1,#subject do | |
| 202 local dn = subject[i] | |
| 203 if dn["oid"] == oid_commonname then | |
| 204 if cn then | |
| 205 log("info", "Certificate has multiple common names") | |
| 206 return false | |
| 207 end | |
| 208 | |
| 209 cn = dn["value"]; | |
| 210 end | |
| 211 end | |
| 212 | |
| 213 if cn then | |
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214 -- Per [TLS-CERTS] 6.4.4, follow the comparison rules for dNSName SANs. |
| 3651 | 215 return compare_dnsname(host, { cn }) |
| 216 end | |
| 217 | |
| 218 -- If all else fails, well, why should we be any different? | |
| 219 return false | |
| 220 end | |
| 221 | |
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222 -- TODO Support other SANs |
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223 local function get_identities(cert) --> map of names to sets of services |
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224 if cert.setencode then |
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225 cert:setencode("utf8"); |
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226 end |
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227 |
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228 local names = mt.new(); |
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229 |
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230 local ext = cert:extensions(); |
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231 local sans = ext[oid_subjectaltname]; |
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232 if sans then |
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233 if sans["dNSName"] then -- Valid for any service |
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234 for _, name in ipairs(sans["dNSName"]) do |
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235 name = idna_to_unicode(nameprep(name)); |
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236 if name then |
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237 names:set(name, "*", true); |
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238 end |
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239 end |
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240 end |
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241 if sans[oid_xmppaddr] then |
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242 for _, name in ipairs(sans[oid_xmppaddr]) do |
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243 name = nameprep(name); |
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244 if name then |
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245 names:set(name, "xmpp-client", true); |
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246 names:set(name, "xmpp-server", true); |
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247 end |
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248 end |
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249 end |
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250 if sans[oid_dnssrv] then |
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251 for _, srvname in ipairs(sans[oid_dnssrv]) do |
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252 local srv, name = srvname:match("^_([^.]+)%.(.*)"); |
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253 if srv then |
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254 name = nameprep(name); |
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255 if name then |
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256 names:set(name, srv, true); |
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257 end |
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258 end |
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259 end |
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260 end |
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261 end |
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262 |
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263 local subject = cert:subject(); |
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264 for i = 1, #subject do |
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265 local dn = subject[i]; |
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266 if dn.oid == oid_commonname then |
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267 local name = nameprep(dn.value); |
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268 if name and idna_to_ascii(name) then |
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269 names:set(name, "*", true); |
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270 end |
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271 end |
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272 end |
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273 return names.data; |
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274 end |
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275 |
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276 local pat = "%-%-%-%-%-BEGIN ([A-Z ]+)%-%-%-%-%-\r?\n".. |
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277 "([0-9A-Za-z+/=\r\n]*)\r?\n%-%-%-%-%-END %1%-%-%-%-%-"; |
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278 |
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279 local function pem2der(pem) |
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280 local typ, data = pem:match(pat); |
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281 if typ and data then |
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282 return base64.decode(data), typ; |
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283 end |
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284 end |
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285 |
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286 local wrap = ('.'):rep(64); |
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287 local envelope = "-----BEGIN %s-----\n%s\n-----END %s-----\n" |
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288 |
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289 local function der2pem(data, typ) |
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290 typ = typ and typ:upper() or "CERTIFICATE"; |
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291 data = base64.encode(data); |
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292 return s_format(envelope, typ, data:gsub(wrap, '%0\n', (#data-1)/64), typ); |
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293 end |
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294 |
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295 return { |
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296 verify_identity = verify_identity; |
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297 get_identities = get_identities; |
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298 pem2der = pem2der; |
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299 der2pem = der2pem; |
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300 }; |
