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psyced/world/net/library/tls.c
2015-01-30 15:05:52 +01:00

229 lines
6.6 KiB
C

#include <net.h> // vim syntax=lpc
#include <proto.h>
#include <sys/tls.h>
mapping tls_certificate(object who, int longnames) {
mixed *extra, extensions;
mapping cert;
int i, j;
cert = ([ ]);
#if __EFUN_DEFINED__(tls_check_certificate)
# ifdef WANT_S2S_SASL
# ifdef __psyclpc__
# if __EFUN_DEFINED__(enable_binary) // happens to be committed at the same time
extra = tls_check_certificate(who, 2);
# else
extra = tls_check_certificate(who, 1);
# endif
# else
extra = tls_check_certificate(who);
# endif
unless (extra && sizeof(extra) > 2) return 0;
cert[0] = extra[0];
if (sizeof(extra) >= 4)
cert[1] = extra[3];
extensions = extra[2];
extra = extra[1];
for (i = 0; i < sizeof(extra); i += 3) {
mixed t;
t = cert[extra[i]];
// THIS IS ALWAYS TRUE FOR DRIVER >= 3.3.712
// OTHERWISE YOU SHOULD NOT ENABLE S2S SASL. PERIOD.
if (sizeof(extra) > i+2) {
unless (t) {
cert[extra[i]] = extra[i+2];
} else if (stringp(t)) {
cert[extra[i]] = ({ t, extra[i+2] });
} else if (pointerp(t)) {
cert[extra[i]] += ({ extra[i+2] });
} else {
PT(("fippo says this should not happen but you know it always does! %O\n", ME))
}
} else {
PT(("fippo says this should not happen(2) but you know it always does! %O\n", ME))
}
}
if (longnames) {
// set up short/long names
for (i = 0; i < sizeof(extra); i +=3) {
cert[extra[i+1]] = cert[extra[i]];
}
}
for (i = 0; i < sizeof(extensions); i += 3) {
string key, mkey;
mixed *val;
unless(extensions[i]) continue;
key = extensions[i];
val = extensions[i+2];
for (j = 0; j < sizeof(val); j += 3) {
mixed t;
mkey = key + ":" + val[j];
t = cert[mkey];
unless (t) {
cert[mkey] = val[j+2];
} else if (stringp(t)) {
cert[mkey] = ({ t, val[j+2] });
} else if (pointerp(t)) {
cert[mkey] += ({ val[j+2] });
} else {
// should not happen
}
}
}
# else
# echo No WANT_S2S_SASL ? You even have the right driver for it!
# endif
#else
# echo No tls_check_certificate available with this driver.
#endif
P2(("cert is %O\n", cert))
return cert;
}
// generalized variant of the old certificate_check_jabbername
// RFC 6125 describes the process in more detail
int tls_check_service_identity(string name, mixed cert, string scheme) {
mixed t;
string idn;
// FIXME: should probably be more careful about internationalized
// domain names - need testcases
#define WILDCARD_MATCH(thing) (strlen(thing) > 2 && thing[0] == '*' && thing[1] == '.' && trail(thing[2..], name))
/* this does not support wildcards if there is more than one
* id-on-xmppAddr/CN
* API Note: name MUST be an utf8 string
*/
unless(name && cert && mappingp(cert)) return 0;
name = NAMEPREP(name);
// subjectAlternativeName - dNSName
if ((t = cert["2.5.29.17:dNSName"])) {
if (stringp(t)) t = ({ t });
foreach(string t2 : t) {
t2 = NAMEPREP(t2);
if (name == t2 || WILDCARD_MATCH(t2))
return 1;
}
}
// subjectAlternativeName - SRV ID - FIXME
// unfortunately, the only ones I have encountered so far were ... unusable
// what they should like is "_psyc.name" - i.e. "_" + scheme + "." + name
// no wildcards probably
if ((t = cert["2.5.29.17:1.3.6.1.5.5.7.8.7"])) {
P2(("encountered SRVName, please tell fippo: %O\n", t))
}
// URI ID - FIXME
// not seen yet
#if 0
// id-on-xmppAddr - have not seen them issued by anyone but
// startcom and those usually include dnsname, too
// utf8-encoded
if ((t = cert["2.5.29.17:1.3.6.1.5.5.7.8.5"])) {
if (pointerp(t)) {
if (member(t, name) != -1) return 1;
foreach(string cn : t) {
if (NAMEPREP(cn) == name) return 1;
}
}
else if (name == NAMEPREP(t))
return 1;
}
#endif
// commonName - deprecated to put the host here but...
// this is only to be checked if no subjectAlternativeName is present
if (!cert["2.5.29.17"] && (t = cert["2.5.4.3"])) { // common name
if (pointerp(t)) { // does that happen?! I don't think so...
// fast way - works for traditional hostnames
if (member(t, name) != -1) return 1;
// look for idn encoded stuff
foreach(string cn : t) {
#ifdef __IDNA__
idn = NAMEPREP(idna_to_unicode(cn));
#else
idn = NAMEPREP(cn);
#endif
if (idn == name) return 1;
}
return 0;
}
#ifdef __IDNA__
idn = NAMEPREP(idna_to_unicode(t));
#else
idn = NAMEPREP(t);
#endif
if (idn == name || WILDCARD_MATCH(idn))
return 1;
}
return 0;
}
string tls_bad_cipher(object sock, string scheme) {
// ignore if pidgin uses a bad cipher over an ssh tunnel
if (scheme == "jabber" && is_localhost(query_ip_number(sock))) return 0;
mixed t = tls_query_connection_info(sock);
unless (t) return "NO-CIPHER"; // shouldnt happen
t = t[TLS_CIPHER];
P3(("%O is using the %O cipher.\n", sock, t))
// shouldn't our negotiation have ensured we have PFS?
if (stringp(t) &&! (abbrev("DHE", t) || abbrev("ECDHE", t))) {
monitor_report("_warning_circuit_encryption_cipher_details",
object_name(sock) +" · using "+ t +" cipher");
return t;
}
return 0;
}
// Do not use server technologies like psyced for strong
// privacy or anonymity requirements. Get started using
// distributed technologies instead. Check out:
// http://youbroketheinternet.org
// http://secushare.org
// But if you're happy with half-baked security, here you
// have it:
// -lynX 2015
//
int probably_private(object source) {
// object has no TCP to it. you have to ask its circuit.
unless (objectp(source) && interactive(source))
return PRIVACY_UNKNOWN;
// should use trustworthy level 9 instead? if so.. how?
if (query_ip_number(source) == "127.0.0.1"
// query_ip_number() efun is faster than a local
// LPC variable, so it is fine we call it often
|| query_ip_number(source) == __HOST_IP_NUMBER__
# ifdef SECURE_IP_NUMBER
|| SECURE_IP_NUMBER(query_ip_number(source))
# endif
// People coming from localhost have either made it
// through SSH's reasonable certificate pinning or
// Tor's public-key based addressing.. both provide
// reasonable protection from men in the middle, if
// only the server itself could be considered secure.
//
) return PRIVACY_REASONABLE;
# if __EFUN_DEFINED__(tls_query_connection_state)
// Alas, this person is using a TLS/SSL-enhanced
// access protocol which, unless the client implements
// certificate pinning, is susceptible to man in the
// middle attacks. Find out more on this topic on
// http://patrol.psyced.org
//
if (tls_query_connection_state(source))
return PRIVACY_MITMX509;
# endif
return PRIVACY_SURVEILLED;
}