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SSLUtils.cc
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SSLUtils.cc
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/** @file
@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 "P_SSLUtils.h"
#include "tscpp/util/TextView.h"
#include "tscore/ink_platform.h"
#include "tscore/SimpleTokenizer.h"
#include "tscore/I_Layout.h"
#include "tscore/ink_cap.h"
#include "tscore/ink_mutex.h"
#include "tscore/Filenames.h"
#include "records/I_RecHttp.h"
#include "tscore/ts_file.h"
#include "P_Net.h"
#include "InkAPIInternal.h"
#include "P_OCSPStapling.h"
#include "P_SSLSNI.h"
#include "P_SSLConfig.h"
#include "SSLSessionCache.h"
#include "SSLSessionTicket.h"
#include "SSLDynlock.h"
#include "SSLDiags.h"
#include "SSLStats.h"
#include <string>
#include <unistd.h>
#include <termios.h>
#include <vector>
#include <openssl/asn1.h>
#include <openssl/bio.h>
#include <openssl/bn.h>
#include <openssl/conf.h>
#include <openssl/dh.h>
#include <openssl/ec.h>
#include <openssl/engine.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/pem.h>
#include <openssl/rand.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#if HAVE_OPENSSL_TS_H
#include <openssl/ts.h>
#endif
using namespace std::literals;
// ssl_multicert.config field names:
static constexpr std::string_view SSL_IP_TAG("dest_ip"sv);
static constexpr std::string_view SSL_CERT_TAG("ssl_cert_name"sv);
static constexpr std::string_view SSL_PRIVATE_KEY_TAG("ssl_key_name"sv);
static constexpr std::string_view SSL_OCSP_RESPONSE_TAG("ssl_ocsp_name"sv);
static constexpr std::string_view SSL_CA_TAG("ssl_ca_name"sv);
static constexpr std::string_view SSL_ACTION_TAG("action"sv);
static constexpr std::string_view SSL_ACTION_TUNNEL_TAG("tunnel"sv);
static constexpr std::string_view SSL_SESSION_TICKET_ENABLED("ssl_ticket_enabled"sv);
static constexpr std::string_view SSL_SESSION_TICKET_NUMBER("ssl_ticket_number"sv);
static constexpr std::string_view SSL_KEY_DIALOG("ssl_key_dialog"sv);
static constexpr std::string_view SSL_SERVERNAME("dest_fqdn"sv);
static constexpr char SSL_CERT_SEPARATE_DELIM = ',';
#ifndef evp_md_func
#ifdef OPENSSL_NO_SHA256
#define evp_md_func EVP_sha1()
#else
#define evp_md_func EVP_sha256()
#endif
#endif
SSLSessionCache *session_cache; // declared extern in P_SSLConfig.h
static int ssl_vc_index = -1;
static ink_mutex *mutex_buf = nullptr;
static bool open_ssl_initialized = false;
/* Using pthread thread ID and mutex functions directly, instead of
* ATS this_ethread / ProxyMutex, so that other linked libraries
* may use pthreads and openssl without confusing us here. (TS-2271).
*/
#if !defined(CRYPTO_THREADID_set_callback)
static void
SSL_pthreads_thread_id(CRYPTO_THREADID *id)
{
CRYPTO_THREADID_set_numeric(id, (unsigned long)pthread_self());
}
#endif
// The locking callback goes away with openssl 1.1 and CRYPTO_LOCK is on longer defined
#if defined(CRYPTO_LOCK) && !defined(CRYPTO_set_locking_callback)
static void
SSL_locking_callback(int mode, int type, const char *file, int line)
{
Debug("v_ssl_lock", "file: %s line: %d type: %d", file, line, type);
ink_assert(type < CRYPTO_num_locks());
#ifdef OPENSSL_FIPS
// don't need to lock for FIPS if it has POSTed and we are not going to change the mode on the fly
if (type == CRYPTO_LOCK_FIPS || type == CRYPTO_LOCK_FIPS2) {
return;
}
#endif
if (mode & CRYPTO_LOCK) {
ink_mutex_acquire(&mutex_buf[type]);
} else if (mode & CRYPTO_UNLOCK) {
ink_mutex_release(&mutex_buf[type]);
} else {
Debug("ssl", "invalid SSL locking mode 0x%x", mode);
ink_assert(0);
}
}
#endif
static bool
SSL_CTX_add_extra_chain_cert_bio(SSL_CTX *ctx, BIO *bio)
{
X509 *cert;
for (;;) {
cert = PEM_read_bio_X509_AUX(bio, nullptr, nullptr, nullptr);
if (!cert) {
// No more the certificates in this file.
break;
}
// This transfers ownership of the cert (X509) to the SSL context, if successful.
#ifdef SSL_CTX_add0_chain_cert
if (!SSL_CTX_add0_chain_cert(ctx, cert)) {
#else
if (!SSL_CTX_add_extra_chain_cert(ctx, cert)) {
#endif
X509_free(cert);
return false;
}
}
return true;
}
static bool
SSL_CTX_add_extra_chain_cert_file(SSL_CTX *ctx, const char *chainfile)
{
scoped_BIO bio(BIO_new_file(chainfile, "r"));
return SSL_CTX_add_extra_chain_cert_bio(ctx, bio);
}
static SSL_SESSION *
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
ssl_get_cached_session(SSL *ssl, unsigned char *id, int len, int *copy)
#else
ssl_get_cached_session(SSL *ssl, const unsigned char *id, int len, int *copy)
#endif
{
TLSSessionResumptionSupport *srs = TLSSessionResumptionSupport::getInstance(ssl);
ink_assert(srs);
if (srs) {
return srs->getSession(ssl, id, len, copy);
}
return nullptr;
}
static int
ssl_new_cached_session(SSL *ssl, SSL_SESSION *sess)
{
unsigned int len = 0;
const unsigned char *id = SSL_SESSION_get_id(sess, &len);
SSLSessionID sid(id, len);
if (diags->tag_activated("ssl.session_cache")) {
char printable_buf[(len * 2) + 1];
sid.toString(printable_buf, sizeof(printable_buf));
Debug("ssl.session_cache.insert", "ssl_new_cached_session session '%s' and context %p", printable_buf, SSL_get_SSL_CTX(ssl));
}
SSL_INCREMENT_DYN_STAT(ssl_session_cache_new_session);
session_cache->insertSession(sid, sess, ssl);
// Call hook after new session is created
APIHook *hook = ssl_hooks->get(TSSslHookInternalID(TS_SSL_SESSION_HOOK));
while (hook) {
hook->invoke(TS_EVENT_SSL_SESSION_NEW, &sid);
hook = hook->m_link.next;
}
return 0;
}
static void
ssl_rm_cached_session(SSL_CTX *ctx, SSL_SESSION *sess)
{
unsigned int len = 0;
const unsigned char *id = SSL_SESSION_get_id(sess, &len);
SSLSessionID sid(id, len);
// Call hook before session is removed
APIHook *hook = ssl_hooks->get(TSSslHookInternalID(TS_SSL_SESSION_HOOK));
while (hook) {
hook->invoke(TS_EVENT_SSL_SESSION_REMOVE, &sid);
hook = hook->m_link.next;
}
if (diags->tag_activated("ssl.session_cache")) {
char printable_buf[(len * 2) + 1];
sid.toString(printable_buf, sizeof(printable_buf));
Debug("ssl.session_cache.remove", "ssl_rm_cached_session cached session '%s'", printable_buf);
}
session_cache->removeSession(sid);
}
static int
set_context_cert(SSL *ssl)
{
shared_SSL_CTX ctx = nullptr;
SSL_CTX *verify_ctx = nullptr;
SSLCertContext *cc = nullptr;
SSLCertificateConfig::scoped_config lookup;
const char *servername = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name);
SSLNetVConnection *netvc = SSLNetVCAccess(ssl);
bool found = true;
int retval = 1;
if (!netvc || netvc->ssl != ssl) {
Debug("ssl.error", "set_context_cert call back on stale netvc");
retval = 0; // Error
goto done;
}
Debug("ssl", "set_context_cert ssl=%p server=%s handshake_complete=%d", ssl, servername, netvc->getSSLHandShakeComplete());
// catch the client renegotiation early on
if (SSLConfigParams::ssl_allow_client_renegotiation == false && netvc->getSSLHandShakeComplete()) {
Debug("ssl", "set_context_cert trying to renegotiate from the client");
retval = 0; // Error
goto done;
}
// The incoming SSL_CTX is either the one mapped from the inbound IP address or the default one. If we
// don't find a name-based match at this point, we *do not* want to mess with the context because we've
// already made a best effort to find the best match.
if (likely(servername)) {
cc = lookup->find(const_cast<char *>(servername));
if (cc) {
ctx = cc->getCtx();
}
if (cc && ctx && SSLCertContextOption::OPT_TUNNEL == cc->opt && netvc->get_is_transparent()) {
netvc->attributes = HttpProxyPort::TRANSPORT_BLIND_TUNNEL;
netvc->setSSLHandShakeComplete(SSL_HANDSHAKE_DONE);
retval = -1;
goto done;
}
}
// If there's no match on the server name, try to match on the peer address.
if (ctx == nullptr) {
IpEndpoint ip;
int namelen = sizeof(ip);
if (0 == safe_getsockname(netvc->get_socket(), &ip.sa, &namelen)) {
cc = lookup->find(ip);
}
if (cc) {
ctx = cc->getCtx();
}
}
if (ctx != nullptr) {
SSL_set_SSL_CTX(ssl, ctx.get());
#if TS_HAVE_OPENSSL_SESSION_TICKETS
// Reset the ticket callback if needed
SSL_CTX_set_tlsext_ticket_key_cb(ctx.get(), ssl_callback_session_ticket);
#endif
} else {
found = false;
}
verify_ctx = SSL_get_SSL_CTX(ssl);
Debug("ssl", "ssl_cert_callback %s SSL context %p for requested name '%s'", found ? "found" : "using", verify_ctx, servername);
if (verify_ctx == nullptr) {
retval = 0;
goto done;
}
done:
return retval;
}
// Callback function for verifying client certificate
static int
ssl_verify_client_callback(int preverify_ok, X509_STORE_CTX *ctx)
{
Debug("ssl", "Callback: verify client cert");
auto *ssl = static_cast<SSL *>(X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx()));
SSLNetVConnection *netvc = SSLNetVCAccess(ssl);
if (!netvc || netvc->ssl != ssl) {
Debug("ssl.error", "ssl_verify_client_callback call back on stale netvc");
return false;
}
netvc->set_verify_cert(ctx);
netvc->callHooks(TS_EVENT_SSL_VERIFY_CLIENT);
netvc->set_verify_cert(nullptr);
if (netvc->getSSLHandShakeComplete()) { // hook moved the handshake state to terminal
Warning("TS_EVENT_SSL_VERIFY_CLIENT plugin failed the client certificate check for %s.", netvc->options.sni_servername.get());
return false;
}
return preverify_ok;
}
static int
PerformAction(Continuation *cont, const char *servername)
{
SNIConfig::scoped_config params;
if (const auto &actions = params->get(servername); !actions.first) {
Debug("ssl_sni", "%s not available in the map", servername);
} else {
for (auto &&item : *actions.first) {
auto ret = item->SNIAction(cont, actions.second);
if (ret != SSL_TLSEXT_ERR_OK) {
return ret;
}
}
}
return SSL_TLSEXT_ERR_OK;
}
#if TS_USE_HELLO_CB
// Pausable callback
static int
ssl_client_hello_callback(SSL *s, int *al, void *arg)
{
SSLNetVConnection *netvc = SSLNetVCAccess(s);
const char *servername = nullptr;
const unsigned char *p;
size_t remaining, len;
if (!netvc || netvc->ssl != s) {
Debug("ssl.error", "ssl_client_hello_callback call back on stale netvc");
return SSL_CLIENT_HELLO_ERROR;
}
// Parse the server name if the get extension call succeeds and there are more than 2 bytes to parse
if (SSL_client_hello_get0_ext(s, TLSEXT_TYPE_server_name, &p, &remaining) && remaining > 2) {
// Parse to get to the name, originally from test/handshake_helper.c in openssl tree
/* Extract the length of the supplied list of names. */
len = *(p++) << 8;
len += *(p++);
if (len + 2 == remaining) {
remaining = len;
/*
* The list in practice only has a single element, so we only consider
* the first one.
*/
if (*p++ == TLSEXT_NAMETYPE_host_name) {
remaining--;
/* Now we can finally pull out the byte array with the actual hostname. */
if (remaining > 2) {
len = *(p++) << 8;
len += *(p++);
if (len + 2 <= remaining) {
servername = reinterpret_cast<const char *>(p);
}
}
}
}
}
if (servername) {
netvc->set_server_name(std::string_view(servername, len));
}
int ret = PerformAction(netvc, netvc->get_server_name());
if (ret != SSL_TLSEXT_ERR_OK) {
return SSL_CLIENT_HELLO_ERROR;
}
if (netvc->has_tunnel_destination() && !netvc->decrypt_tunnel()) {
netvc->attributes = HttpProxyPort::TRANSPORT_BLIND_TUNNEL;
}
if (netvc->protocol_mask_set) {
setTLSValidProtocols(s, netvc->protocol_mask, TLSValidProtocols::max_mask);
}
bool reenabled = netvc->callHooks(TS_EVENT_SSL_CLIENT_HELLO);
if (!reenabled) {
return SSL_CLIENT_HELLO_RETRY;
}
return SSL_CLIENT_HELLO_SUCCESS;
}
#endif
/**
* Called before either the server or the client certificate is used
* Return 1 on success, 0 on error, or -1 to pause
*/
static int
ssl_cert_callback(SSL *ssl, void * /*arg*/)
{
SSLNetVConnection *netvc = SSLNetVCAccess(ssl);
bool reenabled;
int retval = 1;
if (!netvc || netvc->ssl != ssl) {
Debug("ssl.error", "ssl_cert_callback call back on stale netvc");
return 0;
}
// If we are in tunnel mode, don't select a cert. Pause!
if (HttpProxyPort::TRANSPORT_BLIND_TUNNEL == netvc->attributes) {
return -1; // Pause
}
// Do the common certificate lookup only once. If we pause
// and restart processing, do not execute the common logic again
if (!netvc->calledHooks(TS_EVENT_SSL_CERT)) {
retval = set_context_cert(ssl);
if (retval != 1) {
return retval;
}
}
// Call the plugin cert code
reenabled = netvc->callHooks(TS_EVENT_SSL_CERT);
// If it did not re-enable, return the code to
// stop the accept processing
if (!reenabled) {
retval = -1; // Pause
}
// Return 1 for success, 0 for error, or -1 to pause
return retval;
}
/*
* Cannot stop this callback. Always reeneabled
*/
static int
ssl_servername_callback(SSL *ssl, int * /* ad */, void * /*arg*/)
{
SSLNetVConnection *netvc = SSLNetVCAccess(ssl);
if (!netvc || netvc->ssl != ssl) {
Debug("ssl.error", "ssl_servername_callback call back on stale netvc");
return SSL_TLSEXT_ERR_ALERT_FATAL;
}
netvc->callHooks(TS_EVENT_SSL_SERVERNAME);
const char *name = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name);
if (name) {
netvc->set_server_name(name);
}
#if !TS_USE_HELLO_CB
// Only call the SNI actions here if not already performed in the HELLO_CB
int ret = PerformAction(netvc, netvc->get_server_name());
if (ret != SSL_TLSEXT_ERR_OK) {
return SSL_TLSEXT_ERR_ALERT_FATAL;
}
#endif
if (netvc->has_tunnel_destination() && !netvc->decrypt_tunnel()) {
netvc->attributes = HttpProxyPort::TRANSPORT_BLIND_TUNNEL;
}
return SSL_TLSEXT_ERR_OK;
}
#if TS_USE_GET_DH_2048_256 == 0
/* Build 2048-bit MODP Group with 256-bit Prime Order Subgroup from RFC 5114 */
static DH *
DH_get_2048_256()
{
static const unsigned char dh2048_p[] = {
0x87, 0xA8, 0xE6, 0x1D, 0xB4, 0xB6, 0x66, 0x3C, 0xFF, 0xBB, 0xD1, 0x9C, 0x65, 0x19, 0x59, 0x99, 0x8C, 0xEE, 0xF6, 0x08,
0x66, 0x0D, 0xD0, 0xF2, 0x5D, 0x2C, 0xEE, 0xD4, 0x43, 0x5E, 0x3B, 0x00, 0xE0, 0x0D, 0xF8, 0xF1, 0xD6, 0x19, 0x57, 0xD4,
0xFA, 0xF7, 0xDF, 0x45, 0x61, 0xB2, 0xAA, 0x30, 0x16, 0xC3, 0xD9, 0x11, 0x34, 0x09, 0x6F, 0xAA, 0x3B, 0xF4, 0x29, 0x6D,
0x83, 0x0E, 0x9A, 0x7C, 0x20, 0x9E, 0x0C, 0x64, 0x97, 0x51, 0x7A, 0xBD, 0x5A, 0x8A, 0x9D, 0x30, 0x6B, 0xCF, 0x67, 0xED,
0x91, 0xF9, 0xE6, 0x72, 0x5B, 0x47, 0x58, 0xC0, 0x22, 0xE0, 0xB1, 0xEF, 0x42, 0x75, 0xBF, 0x7B, 0x6C, 0x5B, 0xFC, 0x11,
0xD4, 0x5F, 0x90, 0x88, 0xB9, 0x41, 0xF5, 0x4E, 0xB1, 0xE5, 0x9B, 0xB8, 0xBC, 0x39, 0xA0, 0xBF, 0x12, 0x30, 0x7F, 0x5C,
0x4F, 0xDB, 0x70, 0xC5, 0x81, 0xB2, 0x3F, 0x76, 0xB6, 0x3A, 0xCA, 0xE1, 0xCA, 0xA6, 0xB7, 0x90, 0x2D, 0x52, 0x52, 0x67,
0x35, 0x48, 0x8A, 0x0E, 0xF1, 0x3C, 0x6D, 0x9A, 0x51, 0xBF, 0xA4, 0xAB, 0x3A, 0xD8, 0x34, 0x77, 0x96, 0x52, 0x4D, 0x8E,
0xF6, 0xA1, 0x67, 0xB5, 0xA4, 0x18, 0x25, 0xD9, 0x67, 0xE1, 0x44, 0xE5, 0x14, 0x05, 0x64, 0x25, 0x1C, 0xCA, 0xCB, 0x83,
0xE6, 0xB4, 0x86, 0xF6, 0xB3, 0xCA, 0x3F, 0x79, 0x71, 0x50, 0x60, 0x26, 0xC0, 0xB8, 0x57, 0xF6, 0x89, 0x96, 0x28, 0x56,
0xDE, 0xD4, 0x01, 0x0A, 0xBD, 0x0B, 0xE6, 0x21, 0xC3, 0xA3, 0x96, 0x0A, 0x54, 0xE7, 0x10, 0xC3, 0x75, 0xF2, 0x63, 0x75,
0xD7, 0x01, 0x41, 0x03, 0xA4, 0xB5, 0x43, 0x30, 0xC1, 0x98, 0xAF, 0x12, 0x61, 0x16, 0xD2, 0x27, 0x6E, 0x11, 0x71, 0x5F,
0x69, 0x38, 0x77, 0xFA, 0xD7, 0xEF, 0x09, 0xCA, 0xDB, 0x09, 0x4A, 0xE9, 0x1E, 0x1A, 0x15, 0x97};
static const unsigned char dh2048_g[] = {
0x3F, 0xB3, 0x2C, 0x9B, 0x73, 0x13, 0x4D, 0x0B, 0x2E, 0x77, 0x50, 0x66, 0x60, 0xED, 0xBD, 0x48, 0x4C, 0xA7, 0xB1, 0x8F,
0x21, 0xEF, 0x20, 0x54, 0x07, 0xF4, 0x79, 0x3A, 0x1A, 0x0B, 0xA1, 0x25, 0x10, 0xDB, 0xC1, 0x50, 0x77, 0xBE, 0x46, 0x3F,
0xFF, 0x4F, 0xED, 0x4A, 0xAC, 0x0B, 0xB5, 0x55, 0xBE, 0x3A, 0x6C, 0x1B, 0x0C, 0x6B, 0x47, 0xB1, 0xBC, 0x37, 0x73, 0xBF,
0x7E, 0x8C, 0x6F, 0x62, 0x90, 0x12, 0x28, 0xF8, 0xC2, 0x8C, 0xBB, 0x18, 0xA5, 0x5A, 0xE3, 0x13, 0x41, 0x00, 0x0A, 0x65,
0x01, 0x96, 0xF9, 0x31, 0xC7, 0x7A, 0x57, 0xF2, 0xDD, 0xF4, 0x63, 0xE5, 0xE9, 0xEC, 0x14, 0x4B, 0x77, 0x7D, 0xE6, 0x2A,
0xAA, 0xB8, 0xA8, 0x62, 0x8A, 0xC3, 0x76, 0xD2, 0x82, 0xD6, 0xED, 0x38, 0x64, 0xE6, 0x79, 0x82, 0x42, 0x8E, 0xBC, 0x83,
0x1D, 0x14, 0x34, 0x8F, 0x6F, 0x2F, 0x91, 0x93, 0xB5, 0x04, 0x5A, 0xF2, 0x76, 0x71, 0x64, 0xE1, 0xDF, 0xC9, 0x67, 0xC1,
0xFB, 0x3F, 0x2E, 0x55, 0xA4, 0xBD, 0x1B, 0xFF, 0xE8, 0x3B, 0x9C, 0x80, 0xD0, 0x52, 0xB9, 0x85, 0xD1, 0x82, 0xEA, 0x0A,
0xDB, 0x2A, 0x3B, 0x73, 0x13, 0xD3, 0xFE, 0x14, 0xC8, 0x48, 0x4B, 0x1E, 0x05, 0x25, 0x88, 0xB9, 0xB7, 0xD2, 0xBB, 0xD2,
0xDF, 0x01, 0x61, 0x99, 0xEC, 0xD0, 0x6E, 0x15, 0x57, 0xCD, 0x09, 0x15, 0xB3, 0x35, 0x3B, 0xBB, 0x64, 0xE0, 0xEC, 0x37,
0x7F, 0xD0, 0x28, 0x37, 0x0D, 0xF9, 0x2B, 0x52, 0xC7, 0x89, 0x14, 0x28, 0xCD, 0xC6, 0x7E, 0xB6, 0x18, 0x4B, 0x52, 0x3D,
0x1D, 0xB2, 0x46, 0xC3, 0x2F, 0x63, 0x07, 0x84, 0x90, 0xF0, 0x0E, 0xF8, 0xD6, 0x47, 0xD1, 0x48, 0xD4, 0x79, 0x54, 0x51,
0x5E, 0x23, 0x27, 0xCF, 0xEF, 0x98, 0xC5, 0x82, 0x66, 0x4B, 0x4C, 0x0F, 0x6C, 0xC4, 0x16, 0x59};
DH *dh;
if ((dh = DH_new()) == nullptr)
return (nullptr);
dh->p = BN_bin2bn(dh2048_p, sizeof(dh2048_p), nullptr);
dh->g = BN_bin2bn(dh2048_g, sizeof(dh2048_g), nullptr);
if ((dh->p == nullptr) || (dh->g == nullptr)) {
DH_free(dh);
return (nullptr);
}
return (dh);
}
#endif
static SSL_CTX *
ssl_context_enable_dhe(const char *dhparams_file, SSL_CTX *ctx)
{
DH *server_dh;
if (dhparams_file) {
scoped_BIO bio(BIO_new_file(dhparams_file, "r"));
server_dh = PEM_read_bio_DHparams(bio.get(), nullptr, nullptr, nullptr);
} else {
server_dh = DH_get_2048_256();
}
if (!server_dh) {
Error("SSL dhparams source returned invalid parameters");
return nullptr;
}
if (!SSL_CTX_set_options(ctx, SSL_OP_SINGLE_DH_USE) || !SSL_CTX_set_tmp_dh(ctx, server_dh)) {
DH_free(server_dh);
Error("failed to configure SSL DH");
return nullptr;
}
DH_free(server_dh);
return ctx;
}
// SSL_CTX_set_ecdh_auto() is removed by OpenSSL v1.1.0 and ECDH is enabled in default.
// TODO: remove this function when we drop support of OpenSSL v1.0.2* and lower.
static SSL_CTX *
ssl_context_enable_ecdh(SSL_CTX *ctx)
{
#if OPENSSL_VERSION_NUMBER < 0x10100000
#if defined(SSL_CTX_set_ecdh_auto)
SSL_CTX_set_ecdh_auto(ctx, 1);
#elif defined(NID_X9_62_prime256v1)
EC_KEY *ecdh = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
if (ecdh) {
SSL_CTX_set_tmp_ecdh(ctx, ecdh);
EC_KEY_free(ecdh);
}
#endif /* SSL_CTRL_SET_ECDH_AUTO */
#endif /* OPENSSL_VERSION_NUMBER */
return ctx;
}
static ssl_ticket_key_block *
ssl_context_enable_tickets(SSL_CTX *ctx, const char *ticket_key_path)
{
#if TS_HAVE_OPENSSL_SESSION_TICKETS
ssl_ticket_key_block *keyblock = nullptr;
keyblock = ssl_create_ticket_keyblock(ticket_key_path);
// Increase the stats.
if (ssl_rsb != nullptr) { // ssl_rsb is not initialized during the first run.
SSL_INCREMENT_DYN_STAT(ssl_total_ticket_keys_renewed_stat);
}
// Setting the callback can only fail if OpenSSL does not recognize the
// SSL_CTRL_SET_TLSEXT_TICKET_KEY_CB constant. we set the callback first
// so that we don't leave a ticket_key pointer attached if it fails.
if (SSL_CTX_set_tlsext_ticket_key_cb(ctx, ssl_callback_session_ticket) == 0) {
Error("failed to set session ticket callback");
ticket_block_free(keyblock);
return nullptr;
}
SSL_CTX_clear_options(ctx, SSL_OP_NO_TICKET);
return keyblock;
#else /* !TS_HAVE_OPENSSL_SESSION_TICKETS */
(void)ticket_key_path;
return nullptr;
#endif /* TS_HAVE_OPENSSL_SESSION_TICKETS */
}
struct passphrase_cb_userdata {
const SSLConfigParams *_configParams;
const char *_serverDialog;
const char *_serverCert;
const char *_serverKey;
passphrase_cb_userdata(const SSLConfigParams *params, const char *dialog, const char *cert, const char *key)
: _configParams(params), _serverDialog(dialog), _serverCert(cert), _serverKey(key)
{
}
};
// RAII implementation for struct termios
struct ssl_termios : public termios {
ssl_termios(int fd)
{
_fd = -1;
// populate base class data
if (tcgetattr(fd, this) == 0) { // success
_fd = fd;
}
// save our copy
_initialAttr = *this;
}
~ssl_termios()
{
if (_fd != -1) {
tcsetattr(_fd, 0, &_initialAttr);
}
}
bool
ok() const
{
return (_fd != -1);
}
private:
int _fd;
struct termios _initialAttr;
};
static int
ssl_getpassword(const char *prompt, char *buffer, int size)
{
fprintf(stdout, "%s", prompt);
// disable echo and line buffering
ssl_termios tty_attr(STDIN_FILENO);
if (!tty_attr.ok()) {
return -1;
}
tty_attr.c_lflag &= ~ICANON; // no buffer, no backspace
tty_attr.c_lflag &= ~ECHO; // no echo
tty_attr.c_lflag &= ~ISIG; // no signal for ctrl-c
if (tcsetattr(STDIN_FILENO, 0, &tty_attr) < 0) {
return -1;
}
int i = 0;
int ch = 0;
*buffer = 0;
while ((ch = getchar()) != '\n' && ch != EOF) {
// make sure room in buffer
if (i >= size - 1) {
return -1;
}
buffer[i] = ch;
buffer[++i] = 0;
}
return i;
}
static int
ssl_private_key_passphrase_callback_exec(char *buf, int size, int rwflag, void *userdata)
{
if (0 == size) {
return 0;
}
*buf = 0;
passphrase_cb_userdata *ud = static_cast<passphrase_cb_userdata *>(userdata);
Debug("ssl", "ssl_private_key_passphrase_callback_exec rwflag=%d serverDialog=%s", rwflag, ud->_serverDialog);
// only respond to reading private keys, not writing them (does ats even do that?)
if (0 == rwflag) {
// execute the dialog program and use the first line output as the passphrase
FILE *f = popen(ud->_serverDialog, "r");
if (f) {
if (fgets(buf, size, f)) {
// remove any ending CR or LF
for (char *pass = buf; *pass; pass++) {
if (*pass == '\n' || *pass == '\r') {
*pass = 0;
break;
}
}
}
pclose(f);
} else { // popen failed
Error("could not open dialog '%s' - %s", ud->_serverDialog, strerror(errno));
}
}
return strlen(buf);
}
static int
ssl_private_key_passphrase_callback_builtin(char *buf, int size, int rwflag, void *userdata)
{
if (0 == size) {
return 0;
}
*buf = 0;
passphrase_cb_userdata *ud = static_cast<passphrase_cb_userdata *>(userdata);
Debug("ssl", "ssl_private_key_passphrase_callback rwflag=%d serverDialog=%s", rwflag, ud->_serverDialog);
// only respond to reading private keys, not writing them (does ats even do that?)
if (0 == rwflag) {
// output request
fprintf(stdout, "Some of your private key files are encrypted for security reasons.\n");
fprintf(stdout, "In order to read them you have to provide the pass phrases.\n");
fprintf(stdout, "ssl_cert_name=%s", ud->_serverCert);
if (ud->_serverKey) { // output ssl_key_name if provided
fprintf(stdout, " ssl_key_name=%s", ud->_serverKey);
}
fprintf(stdout, "\n");
// get passphrase
// if error, then no passphrase
if (ssl_getpassword("Enter passphrase:", buf, size) <= 0) {
*buf = 0;
}
fprintf(stdout, "\n");
}
return strlen(buf);
}
static bool
ssl_private_key_validate_exec(const char *cmdLine)
{
if (nullptr == cmdLine) {
errno = EINVAL;
return false;
}
bool bReturn = false;
char *cmdLineCopy = ats_strdup(cmdLine);
char *ptr = cmdLineCopy;
while (*ptr && !isspace(*ptr)) {
++ptr;
}
*ptr = 0;
if (access(cmdLineCopy, X_OK) != -1) {
bReturn = true;
}
ats_free(cmdLineCopy);
return bReturn;
}
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
#define ssl_malloc(size, file, line) ssl_malloc(size)
#define ssl_realloc(ptr, size, file, line) ssl_realloc(ptr, size)
#define ssl_free(ptr, file, line) ssl_free(ptr)
#define ssl_track_malloc(size, file, line) ssl_track_malloc(size)
#define ssl_track_realloc(ptr, size, file, line) ssl_track_realloc(ptr, size)
#define ssl_track_free(ptr, file, line) ssl_track_free(ptr)
#endif
void *
ssl_malloc(size_t size, const char * /*filename */, int /*lineno*/)
{
return ats_malloc(size);
}
void *
ssl_realloc(void *ptr, size_t size, const char * /*filename*/, int /*lineno*/)
{
return ats_realloc(ptr, size);
}
void
ssl_free(void *ptr, const char * /*filename*/, int /*lineno*/)
{
ats_free(ptr);
}
void *
ssl_track_malloc(size_t size, const char * /*filename*/, int /*lineno*/)
{
return ats_track_malloc(size, &ssl_memory_allocated);
}
void *
ssl_track_realloc(void *ptr, size_t size, const char * /*filename*/, int /*lineno*/)
{
return ats_track_realloc(ptr, size, &ssl_memory_allocated, &ssl_memory_freed);
}
void
ssl_track_free(void *ptr, const char * /*filename*/, int /*lineno*/)
{
ats_track_free(ptr, &ssl_memory_freed);
}
/*
* Some items are only initialized if certain config values are set
* Must have a second pass that initializes after loading the SSL config
*/
void
SSLPostConfigInitialize()
{
if (SSLConfigParams::engine_conf_file) {
#ifndef OPENSSL_IS_BORINGSSL
ENGINE_load_dynamic();
#endif
OPENSSL_load_builtin_modules();
if (CONF_modules_load_file(SSLConfigParams::engine_conf_file, nullptr, 0) <= 0) {
Error("FATAL: error loading engine configuration file %s", SSLConfigParams::engine_conf_file);
// ERR_print_errors_fp(stderr);
}
}
}
void
SSLInitializeLibrary()
{
if (!open_ssl_initialized) {
// BoringSSL does not have the memory functions
#ifdef HAVE_CRYPTO_SET_MEM_FUNCTIONS
if (res_track_memory >= 2) {
CRYPTO_set_mem_functions(ssl_track_malloc, ssl_track_realloc, ssl_track_free);
} else {
CRYPTO_set_mem_functions(ssl_malloc, ssl_realloc, ssl_free);
}
#endif
SSL_load_error_strings();
SSL_library_init();
#ifdef OPENSSL_FIPS
// calling FIPS_mode_set() will force FIPS to POST (Power On Self Test)
// After POST we don't have to lock for FIPS
int mode = FIPS_mode();
FIPS_mode_set(mode);
Debug("ssl", "FIPS_mode: %d", mode);
#endif
mutex_buf = static_cast<ink_mutex *>(OPENSSL_malloc(CRYPTO_num_locks() * sizeof(ink_mutex)));
for (int i = 0; i < CRYPTO_num_locks(); i++) {
ink_mutex_init(&mutex_buf[i]);
}
CRYPTO_set_locking_callback(SSL_locking_callback);
#if !defined(CRYPTO_THREADID_set_callback)
CRYPTO_THREADID_set_callback(SSL_pthreads_thread_id);
#endif
CRYPTO_set_dynlock_create_callback(ssl_dyn_create_callback);
CRYPTO_set_dynlock_lock_callback(ssl_dyn_lock_callback);
CRYPTO_set_dynlock_destroy_callback(ssl_dyn_destroy_callback);
}
#if TS_USE_TLS_OCSP
ssl_stapling_ex_init();
#endif /* TS_USE_TLS_OCSP */
// Reserve an application data index so that we can attach
// the SSLNetVConnection to the SSL session.
ssl_vc_index = SSL_get_ex_new_index(0, (void *)"NetVC index", nullptr, nullptr, nullptr);
TLSSessionResumptionSupport::initialize();
open_ssl_initialized = true;
}
SSL_CTX *
SSLMultiCertConfigLoader::default_server_ssl_ctx()
{
return SSL_CTX_new(SSLv23_server_method());
}
static bool
SSLPrivateKeyHandler(SSL_CTX *ctx, const SSLConfigParams *params, const std::string &completeServerCertPath, const char *keyPath)
{
#ifndef OPENSSL_IS_BORINGSSL
ENGINE *e = ENGINE_get_default_RSA();
if (e != nullptr) {
ats_scoped_str argkey;
if (keyPath == nullptr || keyPath[0] == '\0') {
argkey = completeServerCertPath.c_str();
} else {
argkey = Layout::get()->relative_to(params->serverKeyPathOnly, keyPath);
}
if (!SSL_CTX_use_PrivateKey(ctx, ENGINE_load_private_key(e, argkey, nullptr, nullptr))) {
SSLError("failed to load server private key from engine");
}
#else
ENGINE *e = nullptr;
if (false) {
#endif
} else if (!keyPath || keyPath[0] == '\0') {
// assume private key is contained in cert obtained from multicert file.
if (!SSL_CTX_use_PrivateKey_file(ctx, completeServerCertPath.c_str(), SSL_FILETYPE_PEM)) {
SSLError("failed to load server private key from %s", completeServerCertPath.c_str());
return false;
}
} else if (params->serverKeyPathOnly != nullptr) {
ats_scoped_str completeServerKeyPath(Layout::get()->relative_to(params->serverKeyPathOnly, keyPath));
if (!SSL_CTX_use_PrivateKey_file(ctx, completeServerKeyPath, SSL_FILETYPE_PEM)) {
SSLError("failed to load server private key from %s", (const char *)completeServerKeyPath);
return false;
}
if (SSLConfigParams::load_ssl_file_cb) {
SSLConfigParams::load_ssl_file_cb(completeServerKeyPath);
}
} else {
SSLError("empty SSL private key path in %s", ts::filename::RECORDS);
return false;
}
if (e == nullptr && !SSL_CTX_check_private_key(ctx)) {
SSLError("server private key does not match the certificate public key");
return false;
}
return true;
}
/**
returns 0 on OK or negative value on failure and update log as appropriate.
Will check:
- if file exists, and has read permissions
- for truncation or other PEM read fail
- current time is between notBefore and notAfter dates of certificate
if anything is not kosher, a negative value is returned and appropriate error logged.
@static
*/
int
SSLMultiCertConfigLoader::check_server_cert_now(X509 *cert, const char *certname)
{
int timeCmpValue;
if (!cert) {
// a truncated certificate would fall into here
Error("invalid certificate %s: file is truncated or corrupted", certname);
return -3;
}
// XXX we should log the notBefore and notAfter dates in the errors ...
timeCmpValue = X509_cmp_current_time(X509_get_notBefore(cert));
if (timeCmpValue == 0) {
// an error occurred parsing the time, which we'll call a bogosity
Error("invalid certificate %s: unable to parse notBefore time", certname);
return -3;
} else if (timeCmpValue > 0) {
// cert contains a date before the notBefore
Error("invalid certificate %s: notBefore date is in the future", certname);
return -4;
}
timeCmpValue = X509_cmp_current_time(X509_get_notAfter(cert));