I have a certificate with two subject alternative names (DNS names).
Using a variant of curl that calls x509asn1.c:Curl_verifyhost() (such as
one built using GSKit), the certificate validation fails because the code
is returning early in the case where the first alternative name is not a
match:
/* Check all GeneralNames. */
for(q = elem.beg; matched != 1 && q < elem.end;) {
q = Curl_getASN1Element(&name, q, elem.end);
switch (name.tag) {
case 2: /* DNS name. */
i = 0;
len = utf8asn1str(&dnsname, CURL_ASN1_IA5_STRING,
name.beg, name.end);
if(len > 0)
if(strlen(dnsname) == (size_t) len)
i = Curl_cert_hostcheck((const char *) dnsname,
conn->host.name);
free(dnsname);
if(!i)
return CURLE_PEER_FAILED_VERIFICATION;
matched = i;
break;
It looks to me like this return statement is incorrect--the loop should be
continued and additional SANs should be considered. If none of them
match, then the code falls through to the case of failing (matched == 0)
and rejects the hostname verification.
--
John Kohl
Senior Software Engineer
IBM Systems, Middleware
Littleton, Massachusetts, USA
[email protected]
-------------------------------------------------------------------
List admin: http://cool.haxx.se/list/listinfo/curl-library
Etiquette: http://curl.haxx.se/mail/etiquette.html
