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openssl: skip trace outputs for ssl_ver == 0

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The OpenSSL trace callback is wonderfully undocumented but given a
journey in the source code, it seems the cases were ssl_ver is zero
doesn't follow the same pattern and thus turned out confusing and
misleading. For now, we skip doing any CURLINFO_TEXT logging on those
but keep sending them as CURLINFO_SSL_DATA_OUT/IN.

Also, I added direction to the text info and I edited some functions
slightly.

Bug: https://github.com/bagder/curl/issues/219
Reported-by: Jay Satiro, Ashish Shukla
This commit is contained in:
Daniel Stenberg 2015-05-04 12:27:59 +02:00
parent 3c104448d6
commit 690317aae2
1 changed files with 44 additions and 23 deletions
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67
lib/vtls/openssl.c
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@ -1487,8 +1487,10 @@ static const char *ssl_msg_type(int ssl_ver, int msg)
return "Client hello";
case SSL3_MT_SERVER_HELLO:
return "Server hello";
case SSL3_MT_NEWSESSION_TICKET:
return "Newsession Ticket";
case SSL3_MT_CERTIFICATE:
return "CERT";
return "Certificate";
case SSL3_MT_SERVER_KEY_EXCHANGE:
return "Server key exchange";
case SSL3_MT_CLIENT_KEY_EXCHANGE:
@ -1501,6 +1503,10 @@ static const char *ssl_msg_type(int ssl_ver, int msg)
return "CERT verify";
case SSL3_MT_FINISHED:
return "Finished";
#ifdef SSL3_MT_CERTIFICATE_STATUS
case SSL3_MT_CERTIFICATE_STATUS:
return "Certificate Status";
#endif
}
}
return "Unknown";
@ -1508,12 +1514,20 @@ static const char *ssl_msg_type(int ssl_ver, int msg)
static const char *tls_rt_type(int type)
{
return (
type == SSL3_RT_CHANGE_CIPHER_SPEC ? "TLS change cipher, " :
type == SSL3_RT_ALERT ? "TLS alert, " :
type == SSL3_RT_HANDSHAKE ? "TLS handshake, " :
type == SSL3_RT_APPLICATION_DATA ? "TLS app data, " :
"TLS Unknown, ");
switch(type) {
case SSL3_RT_HEADER:
return "TLS header";
case SSL3_RT_CHANGE_CIPHER_SPEC:
return "TLS change cipher";
case SSL3_RT_ALERT:
return "TLS alert";
case SSL3_RT_HANDSHAKE:
return "TLS handshake";
case SSL3_RT_APPLICATION_DATA:
return "TLS app data";
default:
return "TLS Unknown";
}
}
@ -1538,8 +1552,8 @@ static void ssl_tls_trace(int direction, int ssl_ver, int content_type,
data = conn->data;
switch(ssl_ver) {
#ifdef SSL2_VERSION_MAJOR /* removed in recent versions */
case SSL2_VERSION_MAJOR:
#ifdef SSL2_VERSION /* removed in recent versions */
case SSL2_VERSION:
verstr = "SSLv2";
break;
#endif
@ -1561,29 +1575,36 @@ static void ssl_tls_trace(int direction, int ssl_ver, int content_type,
verstr = "TLSv1.2";
break;
#endif
case 0:
break;
default:
snprintf(unknown, sizeof(unknown), "(%x)", ssl_ver);
verstr = unknown;
break;
}
ssl_ver >>= 8; /* check the upper 8 bits only below */
if(ssl_ver) {
/* the info given when the version is zero is not that useful for us */
/* SSLv2 doesn't seem to have TLS record-type headers, so OpenSSL
* always pass-up content-type as 0. But the interesting message-type
* is at 'buf[0]'.
*/
if(ssl_ver == SSL3_VERSION_MAJOR && content_type != 0)
tls_rt_name = tls_rt_type(content_type);
else
tls_rt_name = "";
ssl_ver >>= 8; /* check the upper 8 bits only below */
msg_type = *(char*)buf;
msg_name = ssl_msg_type(ssl_ver, msg_type);
/* SSLv2 doesn't seem to have TLS record-type headers, so OpenSSL
* always pass-up content-type as 0. But the interesting message-type
* is at 'buf[0]'.
*/
if(ssl_ver == SSL3_VERSION_MAJOR && content_type)
tls_rt_name = tls_rt_type(content_type);
else
tls_rt_name = "";
txt_len = snprintf(ssl_buf, sizeof(ssl_buf), "%s, %s%s (%d):\n",
verstr, tls_rt_name, msg_name, msg_type);
Curl_debug(data, CURLINFO_TEXT, ssl_buf, (size_t)txt_len, NULL);
msg_type = *(char*)buf;
msg_name = ssl_msg_type(ssl_ver, msg_type);
txt_len = snprintf(ssl_buf, sizeof(ssl_buf), "%s (%s), %s, %s (%d):\n",
verstr, direction?"OUT":"IN",
tls_rt_name, msg_name, msg_type);
Curl_debug(data, CURLINFO_TEXT, ssl_buf, (size_t)txt_len, NULL);
}
Curl_debug(data, (direction == 1) ? CURLINFO_SSL_DATA_OUT :
CURLINFO_SSL_DATA_IN, (char *)buf, len, NULL);