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gnutls: handle IP address in cert name check

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Before GnuTLS 3.3.6, the gnutls_x509_crt_check_hostname() function
didn't actually check IP addresses in SubjectAltName, even though it was
explicitly documented as doing so. So do it ourselves...
This commit is contained in:
David Woodhouse 2014-07-14 20:04:55 +02:00 committed by Daniel Stenberg
parent 08c8d5b89a
commit 98866008a9
1 changed files with 41 additions and 0 deletions
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41
lib/vtls/gtls.c
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@ -781,7 +781,48 @@ gtls_connect_step3(struct connectdata *conn,
alternative name PKIX extension. Returns non zero on success, and zero on
failure. */
rc = gnutls_x509_crt_check_hostname(x509_cert, conn->host.name);
#if GNUTLS_VERSION_NUMBER < 0x030306
/* Before 3.3.6, gnutls_x509_crt_check_hostname() didn't check IP
addresses. */
if(!rc) {
#ifdef ENABLE_IPV6
#define use_addr in6_addr
#else
#define use_addr in_addr
#endif
unsigned char addrbuf[sizeof(struct use_addr)];
unsigned char certaddr[sizeof(struct use_addr)];
size_t addrlen = 0, certaddrlen;
int i;
int ret = 0;
if(Curl_inet_pton(AF_INET, conn->host.name, addrbuf) > 0)
addrlen = 4;
#ifdef ENABLE_IPV6
else if(Curl_inet_pton(AF_INET6, conn->host.name, addrbuf) > 0)
addrlen = 16;
#endif
if(addrlen) {
for(i=0; ; i++) {
certaddrlen = sizeof(certaddr);
ret = gnutls_x509_crt_get_subject_alt_name(x509_cert, i, certaddr,
&certaddrlen, NULL);
/* If this happens, it wasn't an IP address. */
if(ret == GNUTLS_E_SHORT_MEMORY_BUFFER)
continue;
if(ret < 0)
break;
if(ret != GNUTLS_SAN_IPADDRESS)
continue;
if(certaddrlen == addrlen && !memcmp(addrbuf, certaddr, addrlen)) {
rc = 1;
break;
}
}
}
}
#endif
if(!rc) {
if(data->set.ssl.verifyhost) {
failf(data, "SSL: certificate subject name (%s) does not match "