mirror of
git://git.psyced.org/git/psyced
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182 lines
4.9 KiB
C
182 lines
4.9 KiB
C
#include <net.h> // vim syntax=lpc
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#include <proto.h>
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#include <sys/tls.h>
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mapping tls_certificate(object who, int longnames) {
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mixed *extra, extensions;
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mapping cert;
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int i, j;
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cert = ([ ]);
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#if __EFUN_DEFINED__(tls_check_certificate)
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# ifdef WANT_S2S_SASL
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# ifdef __psyclpc__
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# if __EFUN_DEFINED__(enable_binary) // happens to be committed at the same time
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extra = tls_check_certificate(who, 2);
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# else
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extra = tls_check_certificate(who, 1);
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# endif
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# else
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extra = tls_check_certificate(who);
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# endif
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unless (extra && sizeof(extra) > 2) return 0;
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cert[0] = extra[0];
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if (sizeof(extra) >= 4)
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cert[1] = extra[3];
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extensions = extra[2];
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extra = extra[1];
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for (i = 0; i < sizeof(extra); i += 3) {
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mixed t;
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t = cert[extra[i]];
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// THIS IS ALWAYS TRUE FOR DRIVER >= 3.3.712
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// OTHERWISE YOU SHOULD NOT ENABLE S2S SASL. PERIOD.
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if (sizeof(extra) > i+2) {
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unless (t) {
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cert[extra[i]] = extra[i+2];
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} else if (stringp(t)) {
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cert[extra[i]] = ({ t, extra[i+2] });
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} else if (pointerp(t)) {
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cert[extra[i]] += ({ extra[i+2] });
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} else {
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PT(("fippo says this should not happen but you know it always does! %O\n", ME))
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}
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} else {
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PT(("fippo says this should not happen(2) but you know it always does! %O\n", ME))
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}
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}
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if (longnames) {
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// set up short/long names
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for (i = 0; i < sizeof(extra); i +=3) {
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cert[extra[i+1]] = cert[extra[i]];
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}
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}
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for (i = 0; i < sizeof(extensions); i += 3) {
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string key, mkey;
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mixed *val;
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unless(extensions[i]) continue;
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key = extensions[i];
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val = extensions[i+2];
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for (j = 0; j < sizeof(val); j += 3) {
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mixed t;
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mkey = key + ":" + val[j];
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t = cert[mkey];
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unless (t) {
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cert[mkey] = val[j+2];
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} else if (stringp(t)) {
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cert[mkey] = ({ t, val[j+2] });
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} else if (pointerp(t)) {
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cert[mkey] += ({ val[j+2] });
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} else {
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// should not happen
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}
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}
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}
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# else
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# echo No WANT_S2S_SASL ? You even have the right driver for it!
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# endif
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#else
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# echo No tls_check_certificate available with this driver.
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#endif
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P2(("cert is %O\n", cert))
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return cert;
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}
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// generalized variant of the old certificate_check_jabbername
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// RFC 6125 describes the process in more detail
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int tls_check_certificate_data(mixed cert, string name, string scheme) {
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mixed t;
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string idn;
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// FIXME: should probably be more careful about internationalized
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// domain names - need testcases
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#define WILDCARD_MATCH(thing) (strlen(thing) > 2 && thing[0] == '*' && thing[1] == '.' && trail(thing[2..], name))
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/* this does not support wildcards if there is more than one
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* id-on-xmppAddr/CN
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* API Note: name MUST be an utf8 string
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*/
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unless(name && cert && mappingp(cert)) return 0;
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name = NAMEPREP(name);
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// subjectAlternativeName - dNSName
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if ((t = cert["2.5.29.17:dNSName"])) {
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if (stringp(t)) t = ({ t });
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foreach(string t2 : t) {
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t2 = NAMEPREP(t2);
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if (name == t2 || WILDCARD_MATCH(t2))
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return 1;
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}
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}
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// subjectAlternativeName - SRV ID - FIXME
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// unfortunately, the only ones I have encountered so far were ... unusable
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// what they should like is "_psyc.name" - i.e. "_" + scheme + "." + name
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// no wildcards probably
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if ((t = cert["2.5.29.17:1.3.6.1.5.5.7.8.7"])) {
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P2(("encountered SRVName, please tell fippo: %O\n", t))
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}
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// URI ID - FIXME
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// not seen yet
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#if 0
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// id-on-xmppAddr - have not seen them issued by anyone but
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// startcom and those usually include dnsname, too
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if ((t = cert["2.5.29.17:1.3.6.1.5.5.7.8.5"])) {
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if (pointerp(t)) {
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if (member(t, name) != -1) return 1;
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foreach(string cn : t) {
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if (NAMEPREP(cn) == name) return 1;
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}
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}
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else if (name == NAMEPREP(t))
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return 1;
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}
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#endif
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// commonName - deprecated to put the host here but...
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// this is only to be checked if no subjectAlternativeName is present
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if (!cert["2.5.29.17"] && (t = cert["2.5.4.3"])) { // common name
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if (pointerp(t)) { // does that happen?! I don't think so...
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// fast way - works for traditional hostnames
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if (member(t, name) != -1) return 1;
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// look for idn encoded stuff
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foreach(string cn : t) {
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idn = NAMEPREP(idna_to_unicode(cn));
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if (idn == name) return 1;
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}
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return 0;
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}
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#ifdef __IDNA__
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idn = NAMEPREP(idna_to_unicode(t));
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#else
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idn = NAMEPREP(t);
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#endif
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if (idn == name || WILDCARD_MATCH(idn))
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return 1;
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}
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return 0;
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}
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int tls_check_cipher(object sock, string scheme) {
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string t;
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mixed m = tls_query_connection_info(sock);
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P3(("%O is using the %O cipher.\n", sock, m[TLS_CIPHER]))
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// shouldn't our negotiation have ensured we have PFS?
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if (stringp(t = m[TLS_CIPHER]) &&! abbrev("DHE", t)) {
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monitor_report("_warning_circuit_encryption_cipher_details",
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object_name(sock) +" · using "+ t +" cipher");
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// we can't expect that degree of privacy from jabber, for now
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if (scheme != "xmpp") return 0;
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}
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return 1;
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}
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