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/** @file
an example client context dump plugin
@section license License
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include <cstdio>
#include <cstring>
#include <string>
#include <string_view>
#ifdef OPENSSL_NO_SSL_INTERN
#undef OPENSSL_NO_SSL_INTERN
#endif
#include <openssl/opensslv.h>
#include <openssl/ssl.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include "ts/ts.h"
#include "tscpp/util/TextView.h"
#define PLUGIN_NAME "client_context_dump"
TSTextLogObject context_dump_log;
char *
asn1_string_extract(ASN1_STRING *s)
{
#if OPENSSL_VERSION_NUMBER >= 0x010100000
return reinterpret_cast<char *>(const_cast<unsigned char *>(ASN1_STRING_get0_data(s)));
#else
return reinterpret_cast<char *>(ASN1_STRING_data(s));
#endif
}
// For 1.0.2, needs access to internal structure
// For 1.1.0 and 1.1.1, use API
void
dump_context(const char *ca_path, const char *ck_path)
{
TSSslContext ctx = TSSslClientContextFindByName(ca_path, ck_path);
if (ctx) {
SSL *s = SSL_new(reinterpret_cast<SSL_CTX *>(ctx));
if (s) {
char *data = nullptr;
long length = 0;
std::string subject_s, san_s, serial_s, time_s;
X509 *cert = SSL_get_certificate(s);
if (cert) {
// Retrieve state info and write to log object
// expiration date, serial number, common name, and subject alternative names
const ASN1_TIME *not_after = X509_get_notAfter(cert);
const ASN1_INTEGER *serial = X509_get_serialNumber(cert);
X509_NAME *subject_name = X509_get_subject_name(cert);
// Subject name
BIO *subject_bio = BIO_new(BIO_s_mem());
X509_NAME_print_ex(subject_bio, subject_name, 0, XN_FLAG_RFC2253);
length = BIO_get_mem_data(subject_bio, &data);
if (length > 0 && data) {
subject_s = std::string(data, length);
}
length = 0;
data = nullptr;
BIO_free(subject_bio);
// Subject Alternative Name
GENERAL_NAMES *names = static_cast<GENERAL_NAMES *>(X509_get_ext_d2i(cert, NID_subject_alt_name, nullptr, nullptr));
if (names) {
unsigned count = sk_GENERAL_NAME_num(names);
for (unsigned i = 0; i < count; ++i) {
GENERAL_NAME *name = sk_GENERAL_NAME_value(names, i);
data = nullptr;
length = 0;
switch (name->type) {
case (GEN_EMAIL): {
data = asn1_string_extract(name->d.rfc822Name);
length = ASN1_STRING_length(name->d.rfc822Name);
break;
}
case (GEN_DNS): {
data = asn1_string_extract(name->d.dNSName);
length = ASN1_STRING_length(name->d.dNSName);
break;
}
case (GEN_URI): {
data = asn1_string_extract(name->d.uniformResourceIdentifier);
length = ASN1_STRING_length(name->d.uniformResourceIdentifier);
break;
}
default:
break;
}
if (data) {
san_s.append(data, length);
san_s.push_back(',');
}
}
if (san_s.back() == ',') {
san_s.pop_back();
}
}
// Serial number
int64_t sn = 0;
#if !defined(OPENSSL_IS_BORINGSSL) && (OPENSSL_VERSION_NUMBER >= 0x010100000)
ASN1_INTEGER_get_int64(&sn, serial);
#else
sn = ASN1_INTEGER_get(serial);
#endif
if (sn != 0 && sn != -1) {
serial_s = std::to_string(sn);
}
// Expiration
BIO *time_bio = BIO_new(BIO_s_mem());
ASN1_TIME_print(time_bio, not_after);
length = BIO_get_mem_data(time_bio, &data);
time_s = std::string(data, length);
BIO_free(time_bio);
TSDebug(PLUGIN_NAME, "LookupName: %s:%s, Subject: %s. SAN: %s. Serial: %s. NotAfter: %s.", ca_path, ck_path,
subject_s.c_str(), san_s.c_str(), serial_s.c_str(), time_s.c_str());
TSTextLogObjectWrite(context_dump_log, "LookupName: %s:%s, Subject: %s. SAN: %s. Serial: %s. NotAfter: %s.", ca_path,
ck_path, subject_s.c_str(), san_s.c_str(), serial_s.c_str(), time_s.c_str());
}
}
SSL_free(s);
TSSslContextDestroy(ctx);
}
}
// Plugin Message Continuation
int
CB_context_dump(TSCont, TSEvent, void *edata)
{
TSPluginMsg *msg = static_cast<TSPluginMsg *>(edata);
static constexpr std::string_view PLUGIN_PREFIX("client_context_dump."_sv);
std::string_view tag(msg->tag, strlen(msg->tag));
if (tag.substr(0, PLUGIN_PREFIX.size()) == PLUGIN_PREFIX) {
tag.remove_prefix(PLUGIN_PREFIX.size());
// Grab all keys by API and dump to log file according to arg passed in
int count = 0;
TSSslClientContextsNamesGet(0, nullptr, &count);
if (count > 0) {
char const **results = static_cast<char const **>(malloc(sizeof(const char *) * count));
TSSslClientContextsNamesGet(count, results, nullptr);
for (int i = 0; i < count; i += 2) {
dump_context(results[i], results[i + 1]);
}
}
}
TSTextLogObjectFlush(context_dump_log);
return TS_SUCCESS;
}
void
TSPluginInit(int argc, const char *argv[])
{
TSPluginRegistrationInfo info;
info.plugin_name = PLUGIN_NAME;
info.vendor_name = "Apache Software Foundation";
info.support_email = "dev@trafficserver.apache.org";
if (TSPluginRegister(&info) != TS_SUCCESS) {
TSError("[%s] Plugin registration failed", PLUGIN_NAME);
return;
}
if (TSTextLogObjectCreate(PLUGIN_NAME, TS_LOG_MODE_ADD_TIMESTAMP, &context_dump_log) != TS_SUCCESS || !context_dump_log) {
TSError("[%s] Failed to create log file", PLUGIN_NAME);
return;
}
TSDebug(PLUGIN_NAME, "Initialized.");
TSLifecycleHookAdd(TS_LIFECYCLE_MSG_HOOK, TSContCreate(CB_context_dump, nullptr));
}
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