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lighttpd1.4/src/mod_openssl.c

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/*
* mod_openssl - openssl support for lighttpd
*
* Fully-rewritten from original
* Copyright(c) 2016 Glenn Strauss gstrauss()gluelogic.com All rights reserved
* License: BSD 3-clause (same as lighttpd)
*/
/*
* future possible enhancements: OCSP stapling
*
* Note: If session tickets are -not- disabled with
* ssl.openssl.ssl-conf-cmd = ("Options" => "-SessionTicket")
* mod_openssl rotates server ticket encryption key (STEK) every 24 hours.
* This is fine for use with a single lighttpd instance, but with multiple
* lighttpd workers, no coordinated STEK (server ticket encryption key)
* rotation occurs other than by (some external job) restarting lighttpd.
* Restarting lighttpd generates a new key that is shared by lighttpd workers
* for the lifetime of the new key. If the rotation period expires and
* lighttpd has not been restarted, lighttpd workers will generate new
* independent keys, making session tickets less effective for session
* resumption, since clients have a lower chance for future connections to
* reach the same lighttpd worker. However, things will still work, and a new
* session will be created if session resumption fails. Admins should plan to
* restart lighttpd at least every 24 hours if session tickets are enabled and
* multiple lighttpd workers are configured.
*/
#include "first.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/*(not needed)*/
#define OPENSSL_NO_STDIO
#ifndef USE_OPENSSL_KERBEROS
#ifndef OPENSSL_NO_KRB5
#define OPENSSL_NO_KRB5
#endif
#endif
#include "sys-crypto.h"
#include <openssl/ssl.h>
#include <openssl/bio.h>
#include <openssl/bn.h>
#include <openssl/err.h>
#include <openssl/objects.h>
#include <openssl/pem.h>
#include <openssl/rand.h>
#ifndef OPENSSL_NO_DH
#include <openssl/dh.h>
#endif
#if ! defined OPENSSL_NO_TLSEXT && ! defined SSL_CTRL_SET_TLSEXT_HOSTNAME
#define OPENSSL_NO_TLSEXT
#endif
#if OPENSSL_VERSION_NUMBER >= 0x0090800fL
#ifndef OPENSSL_NO_ECDH
#include <openssl/ecdh.h>
#endif
#endif
#include "base.h"
#include "http_header.h"
#include "log.h"
#include "plugin.h"
typedef struct {
/* SNI per host: with COMP_SERVER_SOCKET, COMP_HTTP_SCHEME, COMP_HTTP_HOST */
EVP_PKEY *ssl_pemfile_pkey;
X509 *ssl_pemfile_x509;
STACK_OF(X509) *ssl_pemfile_chain;
const buffer *ssl_pemfile;
const buffer *ssl_privkey;
} plugin_cert;
typedef struct {
SSL_CTX *ssl_ctx;
} plugin_ssl_ctx;
typedef struct {
STACK_OF(X509_NAME) *names;
X509_STORE *certs;
} plugin_cacerts;
typedef struct {
SSL_CTX *ssl_ctx; /* output from network_init_ssl() */
/*(used only during startup; not patched)*/
unsigned char ssl_enabled; /* only interesting for setting up listening sockets. don't use at runtime */
unsigned char ssl_honor_cipher_order; /* determine SSL cipher in server-preferred order, not client-order */
unsigned char ssl_empty_fragments; /* whether to not set SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS */
unsigned char ssl_use_sslv2;
unsigned char ssl_use_sslv3;
const buffer *ssl_cipher_list;
const buffer *ssl_dh_file;
const buffer *ssl_ec_curve;
array *ssl_conf_cmd;
/*(copied from plugin_data for socket ssl_ctx config)*/
const plugin_cert *pc;
const plugin_cacerts *ssl_ca_file;
STACK_OF(X509_NAME) *ssl_ca_dn_file;
const buffer *ssl_ca_crl_file;
unsigned char ssl_verifyclient;
unsigned char ssl_verifyclient_enforce;
unsigned char ssl_verifyclient_depth;
unsigned char ssl_read_ahead;
unsigned char ssl_disable_client_renegotiation;
} plugin_config_socket; /*(used at startup during configuration)*/
typedef struct {
/* SNI per host: w/ COMP_SERVER_SOCKET, COMP_HTTP_SCHEME, COMP_HTTP_HOST */
plugin_cert *pc;
const plugin_cacerts *ssl_ca_file;
STACK_OF(X509_NAME) *ssl_ca_dn_file;
const buffer *ssl_ca_crl_file;
unsigned char ssl_verifyclient;
unsigned char ssl_verifyclient_enforce;
unsigned char ssl_verifyclient_depth;
unsigned char ssl_verifyclient_export_cert;
unsigned char ssl_read_ahead;
unsigned char ssl_log_noise;
unsigned char ssl_disable_client_renegotiation;
const buffer *ssl_verifyclient_username;
const buffer *ssl_acme_tls_1;
} plugin_config;
typedef struct {
PLUGIN_DATA;
plugin_ssl_ctx *ssl_ctxs;
plugin_config defaults;
server *srv;
array *cafiles;
} plugin_data;
static int ssl_is_init;
/* need assigned p->id for deep access of module handler_ctx for connection
* i.e. handler_ctx *hctx = r->plugin_ctx[plugin_data_singleton->id]; */
static plugin_data *plugin_data_singleton;
#define LOCAL_SEND_BUFSIZE (16 * 1024)
static char *local_send_buffer;
typedef struct {
SSL *ssl;
request_st *r;
connection *con;
short renegotiations; /* count of SSL_CB_HANDSHAKE_START */
short close_notify;
unsigned short request_env_patched;
unsigned short alpn;
plugin_config conf;
buffer *tmp_buf;
} handler_ctx;
static handler_ctx *
handler_ctx_init (void)
{
handler_ctx *hctx = calloc(1, sizeof(*hctx));
force_assert(hctx);
return hctx;
}
static void
handler_ctx_free (handler_ctx *hctx)
{
if (hctx->ssl) SSL_free(hctx->ssl);
free(hctx);
}
#ifdef TLSEXT_TYPE_session_ticket
static time_t stek_rotate_ts;
static void
mod_openssl_session_ticket_key_rotate (server * const srv, const plugin_data * const p)
{
/* server ticket encryption key (STEK) is *per-SSL_CTX* in openssl
* and keys are initially created in SSL_CTX_new()
* SSL_CTX_set_tlsext_ticket_keys() is an openssl interface,
* but how to construct its arguments is not well documented.
* See openssl ssl/s3_lib.c
* case SSL_CTRL_SET_TLSEXT_TICKET_KEYS:
* In openssl 1.1.x
* ssl/ssl_local.h
* TLSEXT_KEYNAME_LENGTH 16
* TLSEXT_TICK_KEY_LENGTH 32
* private SSL_CTX data members:
* ssl_ctx->ext.tick_key_name TLSEXT_KEYNAME_LENGTH
* ssl_ctx->ext.secure->tick_hmac_key TLSEXT_TICK_KEY_LENGTH
* ssl_ctx->ext.secure->tick_aes_key TLSEXT_TICK_KEY_LENGTH
* In openssl 1.0.x, each element is 16 bytes (TLSEXT_TICK_KEY_LENGTH 16)
*
* openssl RAND_*bytes() functions are called multiple times since the
* funcs might have a 32-byte limit on number of bytes returned each call
*
* (Note: session ticket encryption key rotation is not expected to fail)
*/
int rc = 1;
#if OPENSSL_VERSION_NUMBER < 0x10100000L
unsigned char keys[16+16+16];
if (RAND_bytes(keys,16) <= 0
|| RAND_bytes(keys+16,16) <= 0
|| RAND_bytes(keys+16+16,16) <= 0)
#else
/*(RAND_priv_bytes() not in openssl 1.1.0; introduced in openssl 1.1.1)*/
#if OPENSSL_VERSION_NUMBER < 0x10101000L
#define RAND_priv_bytes(x,sz) RAND_bytes((x),(sz))
#endif
unsigned char keys[16+32+32];
if (RAND_bytes(keys,16) <= 0
|| RAND_priv_bytes(keys+16,32) <= 0
|| RAND_priv_bytes(keys+16+32,32) <= 0)
#endif
rc = 0;
const size_t sz = sizeof(keys);
for (uint32_t i = 0; i < srv->config_context->used; ++i) {
plugin_ssl_ctx * const s = p->ssl_ctxs + i;
if (!s->ssl_ctx) continue;
if (SSL_CTX_get_options(s->ssl_ctx) & SSL_OP_NO_TICKET) continue;
if (!rc || 1 != SSL_CTX_set_tlsext_ticket_keys(s->ssl_ctx, keys, sz)) {
/*(disable session tickets rather than continue to use aging keys)*/
long opts = SSL_CTX_get_options(s->ssl_ctx) | SSL_OP_NO_TICKET;
SSL_CTX_set_options(s->ssl_ctx, opts);
log_error(srv->errh, __FILE__, __LINE__,
"SSL: STEK rotation failed; disabling session tickets");
}
}
OPENSSL_cleanse(keys, sizeof(keys));
}
#endif /* TLSEXT_TYPE_session_ticket */
INIT_FUNC(mod_openssl_init)
{
plugin_data_singleton = (plugin_data *)calloc(1, sizeof(plugin_data));
#ifdef DEBUG_WOLFSSL
wolfSSL_Debugging_ON();
#endif
return plugin_data_singleton;
}
static int mod_openssl_init_once_openssl (server *srv)
{
if (ssl_is_init) return 1;
#if OPENSSL_VERSION_NUMBER >= 0x10100000L \
&& !defined(LIBRESSL_VERSION_NUMBER)
OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS
|OPENSSL_INIT_LOAD_CRYPTO_STRINGS,NULL);
OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS
|OPENSSL_INIT_ADD_ALL_DIGESTS
|OPENSSL_INIT_LOAD_CONFIG, NULL);
#else
SSL_load_error_strings();
SSL_library_init();
OpenSSL_add_all_algorithms();
#endif
ssl_is_init = 1;
if (0 == RAND_status()) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: not enough entropy in the pool");
return 0;
}
local_send_buffer = malloc(LOCAL_SEND_BUFSIZE);
force_assert(NULL != local_send_buffer);
return 1;
}
static void mod_openssl_free_openssl (void)
{
if (!ssl_is_init) return;
#if OPENSSL_VERSION_NUMBER >= 0x10100000L \
&& !defined(LIBRESSL_VERSION_NUMBER)
/*(OpenSSL libraries handle thread init and deinit)
* https://github.com/openssl/openssl/pull/1048 */
#else
CRYPTO_cleanup_all_ex_data();
ERR_free_strings();
#if OPENSSL_VERSION_NUMBER >= 0x10000000L
ERR_remove_thread_state(NULL);
#else
ERR_remove_state(0);
#endif
EVP_cleanup();
#endif
free(local_send_buffer);
ssl_is_init = 0;
}
static void
mod_openssl_free_config (server *srv, plugin_data * const p)
{
array_free(p->cafiles);
if (NULL != p->ssl_ctxs) {
SSL_CTX * const ssl_ctx_global_scope = p->ssl_ctxs->ssl_ctx;
/* free ssl_ctx from $SERVER["socket"] (if not copy of global scope) */
for (uint32_t i = 1; i < srv->config_context->used; ++i) {
plugin_ssl_ctx * const s = p->ssl_ctxs + i;
if (s->ssl_ctx && s->ssl_ctx != ssl_ctx_global_scope)
SSL_CTX_free(s->ssl_ctx);
}
/* free ssl_ctx from global scope */
if (ssl_ctx_global_scope)
SSL_CTX_free(ssl_ctx_global_scope);
free(p->ssl_ctxs);
}
if (NULL == p->cvlist) return;
/* (init i to 0 if global context; to 1 to skip empty global context) */
for (int i = !p->cvlist[0].v.u2[1], used = p->nconfig; i < used; ++i) {
config_plugin_value_t *cpv = p->cvlist + p->cvlist[i].v.u2[0];
for (; -1 != cpv->k_id; ++cpv) {
switch (cpv->k_id) {
case 0: /* ssl.pemfile */
if (cpv->vtype == T_CONFIG_LOCAL) {
plugin_cert *pc = cpv->v.v;
EVP_PKEY_free(pc->ssl_pemfile_pkey);
X509_free(pc->ssl_pemfile_x509);
sk_X509_pop_free(pc->ssl_pemfile_chain, X509_free);
}
break;
case 2: /* ssl.ca-file */
if (cpv->vtype == T_CONFIG_LOCAL) {
plugin_cacerts *cacerts = cpv->v.v;
sk_X509_NAME_pop_free(cacerts->names, X509_NAME_free);
X509_STORE_free(cacerts->certs);
free(cacerts);
}
break;
case 3: /* ssl.ca-dn-file */
if (cpv->vtype == T_CONFIG_LOCAL)
sk_X509_NAME_pop_free(cpv->v.v, X509_NAME_free);
break;
default:
break;
}
}
}
}
/* openssl BIO_s_file() employs system stdio
* system stdio buffers reads and does not guarantee to clear buffer memory
* 'man PEM_bytes_read_bio_secmem()' and see NOTES section for more info
*/
#ifdef OPENSSL_NO_POSIX_IO
#include <stdio.h>
static BIO *
BIO_new_rdonly_file (const char *file)
{
BIO *in = BIO_new(BIO_s_file());
if (NULL == in)
return NULL;
if (BIO_read_filename(in, file) <= 0) {
BIO_free(in);
return NULL;
}
/* set I/O stream unbuffered (best-effort; not fatal)
* system stdio buffers reads and does not guarantee to clear buffer memory.
* Alternative: provide buffer (e.g. 8k) and clear after use (in caller) */
FILE *fp = NULL;
if (BIO_get_fp(in, &fp))
setvbuf(fp, NULL, _IONBF, 0);
return in;
}
#else /* !OPENSSL_NO_POSIX_IO */
#include <fcntl.h>
#include "fdevent.h"
static BIO *
BIO_new_rdonly_file (const char *file)
{
/* unbuffered fd; not using system stdio */
int fd = fdevent_open_cloexec(file, 1, O_RDONLY, 0);
if (fd < 0)
return NULL;
BIO *in = BIO_new_fd(fd, BIO_CLOSE);
if (NULL == in) {
close(fd);
return NULL;
}
return in;
}
#endif /* !OPENSSL_NO_POSIX_IO */
/* use memory from openssl secure heap for temporary buffers, returned storage
* (pemfile might contain a private key in addition to certificate chain)
* Interfaces similar to those constructed in include/openssl/pem.h for
* PEM_read_bio_X509(), except this is named PEM_read_bio_X509_secmem().
* Similar for PEM_read_bio_X509_AUX_secmem().
*
* Supporting routine PEM_ASN1_read_bio_secmem() modified from openssl
* crypto/pem/pem_oth.c:PEM_ASN1_read_bio():
* uses PEM_bytes_read_bio_secmem() instead of PEM_bytes_read_bio()
* uses OPENSSL_secure_clear_free() instead of OPENSSL_free()
*
* PEM_bytes_read_bio_secmem() openssl 1.1.1 or later
* OPENSSL_secure_clear_free() openssl 1.1.0g or later
* As this comment is being written, only openssl 1.1.1 is actively maintained.
* Earlier vers of openssl no longer receive security patches from openssl.org.
*/
static void *
PEM_ASN1_read_bio_secmem(d2i_of_void *d2i, const char *name, BIO *bp, void **x,
pem_password_cb *cb, void *u)
{
const unsigned char *p = NULL;
unsigned char *data = NULL;
long len = 0;
char *ret = NULL;
#if OPENSSL_VERSION_NUMBER >= 0x10101000L
if (!PEM_bytes_read_bio_secmem(&data, &len, NULL, name, bp, cb, u))
#else
if (!PEM_bytes_read_bio(&data, &len, NULL, name, bp, cb, u))
#endif
return NULL;
p = data;
ret = d2i(x, &p, len);
if (ret == NULL)
PEMerr(PEM_F_PEM_ASN1_READ_BIO, ERR_R_ASN1_LIB);
#if OPENSSL_VERSION_NUMBER >= 0x10101000L
OPENSSL_secure_clear_free(data, len);
#else
OPENSSL_cleanse(data, len);
OPENSSL_free(data);
#endif
return ret;
}
static X509 *
PEM_read_bio_X509_secmem(BIO *bp, X509 **x, pem_password_cb *cb, void *u)
{
return PEM_ASN1_read_bio_secmem((d2i_of_void *)d2i_X509,
PEM_STRING_X509,
bp, (void **)x, cb, u);
}
static X509 *
PEM_read_bio_X509_AUX_secmem(BIO *bp, X509 **x, pem_password_cb *cb, void *u)
{
return PEM_ASN1_read_bio_secmem((d2i_of_void *)d2i_X509_AUX,
PEM_STRING_X509_TRUSTED,
bp, (void **)x, cb, u);
}
static int
mod_openssl_load_X509_sk (const char *file, log_error_st *errh, STACK_OF(X509) **chain, BIO *in)
{
STACK_OF(X509) *chain_sk = NULL;
for (X509 *ca; (ca = PEM_read_bio_X509_secmem(in,NULL,NULL,NULL)); ) {
if (NULL == chain_sk) /*(allocate only if it will not be empty)*/
chain_sk = sk_X509_new_null();
if (!chain_sk || !sk_X509_push(chain_sk, ca)) {
log_error(errh, __FILE__, __LINE__,
"SSL: couldn't read X509 certificates from '%s'", file);
if (chain_sk) sk_X509_pop_free(chain_sk, X509_free);
X509_free(ca);
return 0;
}
}
*chain = chain_sk;
return 1;
}
static int
mod_openssl_load_X509_STORE (const char *file, log_error_st *errh, X509_STORE **chain, BIO *in)
{
X509_STORE *chain_store = NULL;
for (X509 *ca; (ca = PEM_read_bio_X509(in,NULL,NULL,NULL)); X509_free(ca)) {
if (NULL == chain_store) /*(allocate only if it will not be empty)*/
chain_store = X509_STORE_new();
if (!chain_store || !X509_STORE_add_cert(chain_store, ca)) {
log_error(errh, __FILE__, __LINE__,
"SSL: couldn't read X509 certificates from '%s'", file);
if (chain_store) X509_STORE_free(chain_store);
X509_free(ca);
return 0;
}
}
*chain = chain_store;
return 1;
}
static plugin_cacerts *
mod_openssl_load_cacerts (const buffer *ssl_ca_file, log_error_st *errh)
{
const char *file = ssl_ca_file->ptr;
BIO *in = BIO_new(BIO_s_file());
if (NULL == in) {
log_error(errh, __FILE__, __LINE__,
"SSL: BIO_new(BIO_s_file()) failed");
return NULL;
}
if (BIO_read_filename(in, file) <= 0) {
log_error(errh, __FILE__, __LINE__,
"SSL: BIO_read_filename('%s') failed", file);
BIO_free(in);
return NULL;
}
X509_STORE *chain_store = NULL;
if (!mod_openssl_load_X509_STORE(file, errh, &chain_store, in)) {
BIO_free(in);
return NULL;
}
BIO_free(in);
if (NULL == chain_store) {
log_error(errh, __FILE__, __LINE__,
"SSL: ssl.ca-file is empty %s", file);
return NULL;
}
plugin_cacerts *cacerts = malloc(sizeof(plugin_cacerts));
force_assert(cacerts);
/* (would be more efficient to walk the X509_STORE and build the list,
* but this works for now and matches how ssl.ca-dn-file is handled) */
cacerts->names = SSL_load_client_CA_file(file);
if (NULL == cacerts->names) {
X509_STORE_free(chain_store);
free(cacerts);
return NULL;
}
cacerts->certs = chain_store;
return cacerts;
}
static int
mod_openssl_load_cacrls (X509_STORE *store, const buffer *ssl_ca_crl_file, server *srv)
{
if (1 != X509_STORE_load_locations(store, ssl_ca_crl_file->ptr, NULL)) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: %s %s", ERR_error_string(ERR_get_error(), NULL),
ssl_ca_crl_file->ptr);
return 0;
}
X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL);
return 1;
}
#if OPENSSL_VERSION_NUMBER < 0x10002000
static int
mod_openssl_load_verify_locn (SSL_CTX *ssl_ctx, const buffer *b, server *srv)
{
const char *fn = b->ptr;
if (1 == SSL_CTX_load_verify_locations(ssl_ctx, fn, NULL))
return 1;
log_error(srv->errh, __FILE__, __LINE__,
"SSL: %s %s", ERR_error_string(ERR_get_error(), NULL), fn);
return 0;
}
static int
mod_openssl_load_ca_files (SSL_CTX *ssl_ctx, plugin_data *p, server *srv)
{
/* load all ssl.ca-files specified in the config into each SSL_CTX */
for (uint32_t i = 0, used = p->cafiles->used; i < used; ++i) {
const buffer *b = &((data_string *)p->cafiles->data[i])->value;
if (!mod_openssl_load_verify_locn(ssl_ctx, b, srv))
return 0;
}
return 1;
}
#endif
FREE_FUNC(mod_openssl_free)
{
plugin_data *p = p_d;
if (NULL == p->srv) return;
mod_openssl_free_config(p->srv, p);
mod_openssl_free_openssl();
}
static void
mod_openssl_merge_config_cpv (plugin_config * const pconf, const config_plugin_value_t * const cpv)
{
switch (cpv->k_id) { /* index into static config_plugin_keys_t cpk[] */
case 0: /* ssl.pemfile */
if (cpv->vtype == T_CONFIG_LOCAL)
pconf->pc = cpv->v.v;
break;
case 1: /* ssl.privkey */
break;
case 2: /* ssl.ca-file */
if (cpv->vtype == T_CONFIG_LOCAL)
pconf->ssl_ca_file = cpv->v.v;
break;
case 3: /* ssl.ca-dn-file */
if (cpv->vtype == T_CONFIG_LOCAL)
pconf->ssl_ca_dn_file = cpv->v.v;
break;
case 4: /* ssl.ca-crl-file */
pconf->ssl_ca_crl_file = cpv->v.b;
break;
case 5: /* ssl.read-ahead */
pconf->ssl_read_ahead = (0 != cpv->v.u);
break;
case 6: /* ssl.disable-client-renegotiation */
pconf->ssl_disable_client_renegotiation = (0 != cpv->v.u);
break;
case 7: /* ssl.verifyclient.activate */
pconf->ssl_verifyclient = (0 != cpv->v.u);
break;
case 8: /* ssl.verifyclient.enforce */
pconf->ssl_verifyclient_enforce = (0 != cpv->v.u);
break;
case 9: /* ssl.verifyclient.depth */
pconf->ssl_verifyclient_depth = (unsigned char)cpv->v.shrt;
break;
case 10:/* ssl.verifyclient.username */
pconf->ssl_verifyclient_username = cpv->v.b;
break;
case 11:/* ssl.verifyclient.exportcert */
pconf->ssl_verifyclient_export_cert = (0 != cpv->v.u);
break;
case 12:/* ssl.acme-tls-1 */
pconf->ssl_acme_tls_1 = cpv->v.b;
break;
case 13:/* debug.log-ssl-noise */
pconf->ssl_log_noise = (0 != cpv->v.u);
break;
default:/* should not happen */
return;
}
}
static void
mod_openssl_merge_config(plugin_config * const pconf, const config_plugin_value_t *cpv)
{
do {
mod_openssl_merge_config_cpv(pconf, cpv);
} while ((++cpv)->k_id != -1);
}
static void
mod_openssl_patch_config (request_st * const r, plugin_config * const pconf)
{
plugin_data * const p = plugin_data_singleton;
memcpy(pconf, &p->defaults, sizeof(plugin_config));
for (int i = 1, used = p->nconfig; i < used; ++i) {
if (config_check_cond(r, (uint32_t)p->cvlist[i].k_id))
mod_openssl_merge_config(pconf, p->cvlist + p->cvlist[i].v.u2[0]);
}
}
static int
safer_X509_NAME_oneline(X509_NAME *name, char *buf, size_t sz)
{
BIO *bio = BIO_new(BIO_s_mem());
if (bio) {
int len = X509_NAME_print_ex(bio, name, 0, XN_FLAG_ONELINE);
BIO_gets(bio, buf, (int)sz); /*(may be truncated if len >= sz)*/
BIO_free(bio);
return len; /*return value has similar semantics to that of snprintf()*/
}
else {
buf[0] = '\0';
return -1;
}
}
static void
ssl_info_callback (const SSL *ssl, int where, int ret)
{
UNUSED(ret);
if (0 != (where & SSL_CB_HANDSHAKE_START)) {
handler_ctx *hctx = (handler_ctx *) SSL_get_app_data(ssl);
if (hctx->renegotiations >= 0) ++hctx->renegotiations;
}
#ifdef TLS1_3_VERSION
/* https://github.com/openssl/openssl/issues/5721
* "TLSv1.3 unexpected InfoCallback after handshake completed" */
if (0 != (where & SSL_CB_HANDSHAKE_DONE)) {
/* SSL_version() is valid after initial handshake completed */
if (SSL_version(ssl) >= TLS1_3_VERSION) {
/* https://wiki.openssl.org/index.php/TLS1.3
* "Renegotiation is not possible in a TLSv1.3 connection" */
handler_ctx *hctx = (handler_ctx *) SSL_get_app_data(ssl);
hctx->renegotiations = -1;
}
}
#endif
}
/* https://wiki.openssl.org/index.php/Manual:SSL_CTX_set_verify(3)#EXAMPLES */
static int
verify_callback(int preverify_ok, X509_STORE_CTX *ctx)
{
char buf[256];
X509 *err_cert;
int err, depth;
SSL *ssl;
handler_ctx *hctx;
err = X509_STORE_CTX_get_error(ctx);
depth = X509_STORE_CTX_get_error_depth(ctx);
/*
* Retrieve the pointer to the SSL of the connection currently treated
* and the application specific data stored into the SSL object.
*/
ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
hctx = (handler_ctx *) SSL_get_app_data(ssl);
/*
* Catch a too long certificate chain. The depth limit set using
* SSL_CTX_set_verify_depth() is by purpose set to "limit+1" so
* that whenever the "depth>verify_depth" condition is met, we
* have violated the limit and want to log this error condition.
* We must do it here, because the CHAIN_TOO_LONG error would not
* be found explicitly; only errors introduced by cutting off the
* additional certificates would be logged.
*/
if (depth > hctx->conf.ssl_verifyclient_depth) {
preverify_ok = 0;
err = X509_V_ERR_CERT_CHAIN_TOO_LONG;
X509_STORE_CTX_set_error(ctx, err);
}
if (preverify_ok && 0 == depth && NULL != hctx->conf.ssl_ca_dn_file) {
/* verify that client cert is issued by CA in ssl.ca-dn-file
* if both ssl.ca-dn-file and ssl.ca-file were configured */
STACK_OF(X509_NAME) * const cert_names = hctx->conf.ssl_ca_dn_file;
X509_NAME *issuer;
#if OPENSSL_VERSION_NUMBER >= 0x10002000L
err_cert = X509_STORE_CTX_get_current_cert(ctx);
#else
err_cert = ctx->current_cert;
#endif
if (NULL == err_cert) return !hctx->conf.ssl_verifyclient_enforce;
issuer = X509_get_issuer_name(err_cert);
#if 0 /*(?desirable/undesirable to have cert_names sorted?)*/
if (-1 != sk_X509_NAME_find(cert_names, issuer))
return preverify_ok; /* match */
#else
for (int i = 0, len = sk_X509_NAME_num(cert_names); i < len; ++i) {
if (0 == X509_NAME_cmp(sk_X509_NAME_value(cert_names, i), issuer))
return preverify_ok; /* match */
}
#endif
preverify_ok = 0;
err = X509_V_ERR_CERT_REJECTED;
X509_STORE_CTX_set_error(ctx, err);
}
if (preverify_ok) {
return preverify_ok;
}
#if OPENSSL_VERSION_NUMBER >= 0x10002000L
err_cert = X509_STORE_CTX_get_current_cert(ctx);
#else
err_cert = ctx->current_cert;
#endif
if (NULL == err_cert) return !hctx->conf.ssl_verifyclient_enforce;
safer_X509_NAME_oneline(X509_get_subject_name(err_cert),buf,sizeof(buf));
log_error_st *errh = hctx->r->conf.errh;
log_error(errh, __FILE__, __LINE__,
"SSL: verify error:num=%d:%s:depth=%d:subject=%s",
err, X509_verify_cert_error_string(err), depth, buf);
/*
* At this point, err contains the last verification error. We can use
* it for something special
*/
if (!preverify_ok && (err == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY ||
err == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT)) {
safer_X509_NAME_oneline(X509_get_issuer_name(err_cert),buf,sizeof(buf));
log_error(errh, __FILE__, __LINE__, "SSL: issuer=%s", buf);
}
return !hctx->conf.ssl_verifyclient_enforce;
}
static int
mod_openssl_cert_cb (SSL *ssl, void *arg)
{
handler_ctx *hctx = (handler_ctx *) SSL_get_app_data(ssl);
plugin_cert *pc = hctx->conf.pc;
UNUSED(arg);
if (NULL == pc->ssl_pemfile_x509 || NULL == pc->ssl_pemfile_pkey) {
/* x509/pkey available <=> pemfile was set <=> pemfile got patched:
* so this should never happen, unless you nest $SERVER["socket"] */
log_error(hctx->r->conf.errh, __FILE__, __LINE__,
"SSL: no certificate/private key for TLS server name %s",
hctx->r->uri.authority.ptr);
return 0;
}
/* first set certificate!
* setting private key checks whether certificate matches it */
if (1 != SSL_use_certificate(ssl, pc->ssl_pemfile_x509)) {
log_error(hctx->r->conf.errh, __FILE__, __LINE__,
"SSL: failed to set certificate for TLS server name %s: %s",
hctx->r->uri.authority.ptr, ERR_error_string(ERR_get_error(), NULL));
return 0;
}
#if OPENSSL_VERSION_NUMBER >= 0x10002000
if (pc->ssl_pemfile_chain)
SSL_set1_chain(ssl, pc->ssl_pemfile_chain);
else if (hctx->conf.ssl_ca_file) {
/* preserve legacy behavior whereby openssl will reuse CAs trusted for
* certificate verification (set by SSL_CTX_load_verify_locations() in
* SSL_CTX) in order to build certificate chain for server certificate
* sent to client */
SSL_set1_chain_cert_store(ssl, hctx->conf.ssl_ca_file->certs);
if (1 != SSL_build_cert_chain(ssl,
SSL_BUILD_CHAIN_FLAG_NO_ROOT
| SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR
| SSL_BUILD_CHAIN_FLAG_CLEAR_ERROR)) {
log_error(hctx->r->conf.errh, __FILE__, __LINE__,
"SSL: building cert chain for TLS server name %s: %s",
hctx->r->uri.authority.ptr,
ERR_error_string(ERR_get_error(), NULL));
return 0;
}
else { /* copy chain for future reuse */
STACK_OF(X509) *chain = NULL;
SSL_get0_chain_certs(ssl, &chain);
pc->ssl_pemfile_chain = X509_chain_up_ref(chain);
SSL_set1_chain_cert_store(ssl, NULL);
}
}
#endif
if (1 != SSL_use_PrivateKey(ssl, pc->ssl_pemfile_pkey)) {
log_error(hctx->r->conf.errh, __FILE__, __LINE__,
"SSL: failed to set private key for TLS server name %s: %s",
hctx->r->uri.authority.ptr, ERR_error_string(ERR_get_error(), NULL));
return 0;
}
if (hctx->conf.ssl_verifyclient) {
if (NULL == hctx->conf.ssl_ca_file) {
log_error(hctx->r->conf.errh, __FILE__, __LINE__,
"SSL: can't verify client without ssl.ca-file "
"for TLS server name %s", hctx->r->uri.authority.ptr);
return 0;
}
#if OPENSSL_VERSION_NUMBER >= 0x10002000
SSL_set1_verify_cert_store(ssl, hctx->conf.ssl_ca_file->certs);
#endif
/* WTH openssl? SSL_set_client_CA_list() calls set0_CA_list(),
* but there is no set1_CA_list() to simply up the reference count
* (without needing to duplicate the list) */
STACK_OF(X509_NAME) * const cert_names = hctx->conf.ssl_ca_dn_file
? hctx->conf.ssl_ca_dn_file
: hctx->conf.ssl_ca_file->names;
SSL_set_client_CA_list(ssl, SSL_dup_CA_list(cert_names));
int mode = SSL_VERIFY_PEER;
if (hctx->conf.ssl_verifyclient_enforce)
mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
SSL_set_verify(ssl, mode, verify_callback);
SSL_set_verify_depth(ssl, hctx->conf.ssl_verifyclient_depth + 1);
}
else {
SSL_set_verify(ssl, SSL_VERIFY_NONE, NULL);
}
return 1;
}
#ifndef OPENSSL_NO_TLSEXT
static int
mod_openssl_SNI (handler_ctx *hctx, const char *servername, size_t len)
{
request_st * const r = hctx->r;
if (len >= 1024) { /*(expecting < 256; TLSEXT_MAXLEN_host_name is 255)*/
log_error(r->conf.errh, __FILE__, __LINE__,
"SSL: SNI name too long %.*s", (int)len, servername);
return SSL_TLSEXT_ERR_ALERT_FATAL;
}
/* use SNI to patch mod_openssl config and then reset COMP_HTTP_HOST */
buffer_copy_string_len(&r->uri.authority, servername, len);
buffer_to_lower(&r->uri.authority);
#if 0
/*(r->uri.authority used below for configuration before request read;
* revisit for h2)*/
if (0 != http_request_host_policy(&r->uri.authority,
r->conf.http_parseopts, 443))
return SSL_TLSEXT_ERR_ALERT_FATAL;
#endif
r->conditional_is_valid |= (1 << COMP_HTTP_SCHEME)
| (1 << COMP_HTTP_HOST);
mod_openssl_patch_config(r, &hctx->conf);
/* reset COMP_HTTP_HOST so that conditions re-run after request hdrs read */
/*(done in response.c:config_cond_cache_reset() after request hdrs read)*/
/*config_cond_cache_reset_item(r, COMP_HTTP_HOST);*/
/*buffer_clear(&r->uri.authority);*/
#if OPENSSL_VERSION_NUMBER >= 0x10002000L
return SSL_TLSEXT_ERR_OK;
#else
return (mod_openssl_cert_cb(hctx->ssl, NULL) == 1)
? SSL_TLSEXT_ERR_OK
: SSL_TLSEXT_ERR_ALERT_FATAL;
#endif
}
#ifdef SSL_CLIENT_HELLO_SUCCESS
static int
mod_openssl_client_hello_cb (SSL *ssl, int *al, void *srv)
{
handler_ctx *hctx = (handler_ctx *) SSL_get_app_data(ssl);
buffer_copy_string(&hctx->r->uri.scheme, "https");
UNUSED(srv);
const unsigned char *name;
size_t len, slen;
if (!SSL_client_hello_get0_ext(ssl, TLSEXT_TYPE_server_name, &name, &len)) {
return SSL_CLIENT_HELLO_SUCCESS; /* client did not provide SNI */
}
/* expecting single element in the server_name extension; parse first one */
if (len > 5
&& (size_t)((name[0] << 8) + name[1]) == len-2
&& name[2] == TLSEXT_TYPE_server_name
&& (slen = (name[3] << 8) + name[4]) <= len-5) { /*(first)*/
int read_ahead = hctx->conf.ssl_read_ahead;
int rc = mod_openssl_SNI(hctx, (const char *)name+5, slen);
if (!read_ahead && hctx->conf.ssl_read_ahead)
SSL_set_read_ahead(ssl, hctx->conf.ssl_read_ahead);
if (rc == SSL_TLSEXT_ERR_OK)
return SSL_CLIENT_HELLO_SUCCESS;
}
*al = TLS1_AD_UNRECOGNIZED_NAME;
return SSL_CLIENT_HELLO_ERROR;
}
#else
static int
network_ssl_servername_callback (SSL *ssl, int *al, void *srv)
{
handler_ctx *hctx = (handler_ctx *) SSL_get_app_data(ssl);
buffer_copy_string(&hctx->r->uri.scheme, "https");
UNUSED(al);
UNUSED(srv);
const char *servername = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name);
if (NULL == servername)
return SSL_TLSEXT_ERR_NOACK; /* client did not provide SNI */
int read_ahead = hctx->conf.ssl_read_ahead;
int rc = mod_openssl_SNI(hctx, servername, strlen(servername));
if (!read_ahead && hctx->conf.ssl_read_ahead)
SSL_set_read_ahead(ssl, hctx->conf.ssl_read_ahead);
return rc;
}
#endif
#endif
static X509 *
mod_openssl_load_pem_file (const char *file, log_error_st *errh, STACK_OF(X509) **chain)
{
*chain = NULL;
BIO *in = BIO_new_rdonly_file(file);
if (NULL == in) {
log_error(errh, __FILE__, __LINE__,
"SSL: BIO_new/BIO_read_filename('%s') failed", file);
return NULL;
}
X509 *x = PEM_read_bio_X509_AUX_secmem(in, NULL, NULL, NULL);
if (NULL == x) {
log_error(errh, __FILE__, __LINE__,
"SSL: couldn't read X509 certificate from '%s'", file);
}
else if (!mod_openssl_load_X509_sk(file, errh, chain, in)) {
X509_free(x);
x = NULL;
}
BIO_free(in);
return x;
}
static EVP_PKEY *
mod_openssl_evp_pkey_load_pem_file (const char *file, log_error_st *errh)
{
BIO *in = BIO_new_rdonly_file(file);
if (NULL == in) {
log_error(errh, __FILE__, __LINE__,
"SSL: BIO_new/BIO_read_filename('%s') failed", file);
return NULL;
}
EVP_PKEY *x = PEM_read_bio_PrivateKey(in, NULL, NULL, NULL);
BIO_free(in);
if (NULL == x)
log_error(errh, __FILE__, __LINE__,
"SSL: couldn't read private key from '%s'", file);
return x;
}
static plugin_cert *
network_openssl_load_pemfile (server *srv, const buffer *pemfile, const buffer *privkey)
{
if (!mod_openssl_init_once_openssl(srv)) return NULL;
STACK_OF(X509) *ssl_pemfile_chain = NULL;
X509 *ssl_pemfile_x509 =
mod_openssl_load_pem_file(pemfile->ptr, srv->errh, &ssl_pemfile_chain);
if (NULL == ssl_pemfile_x509)
return NULL;
EVP_PKEY *ssl_pemfile_pkey =
mod_openssl_evp_pkey_load_pem_file(privkey->ptr, srv->errh);
if (NULL == ssl_pemfile_pkey) {
X509_free(ssl_pemfile_x509);
sk_X509_pop_free(ssl_pemfile_chain, X509_free);
return NULL;
}
if (!X509_check_private_key(ssl_pemfile_x509, ssl_pemfile_pkey)) {
log_error(srv->errh, __FILE__, __LINE__, "SSL:"
"Private key does not match the certificate public key, "
"reason: %s %s %s", ERR_error_string(ERR_get_error(), NULL),
pemfile->ptr, privkey->ptr);
EVP_PKEY_free(ssl_pemfile_pkey);
X509_free(ssl_pemfile_x509);
sk_X509_pop_free(ssl_pemfile_chain, X509_free);
return NULL;
}
plugin_cert *pc = malloc(sizeof(plugin_cert));
force_assert(pc);
pc->ssl_pemfile_pkey = ssl_pemfile_pkey;
pc->ssl_pemfile_x509 = ssl_pemfile_x509;
pc->ssl_pemfile_chain= ssl_pemfile_chain;
pc->ssl_pemfile = pemfile;
pc->ssl_privkey = privkey;
return pc;
}
#ifndef OPENSSL_NO_TLSEXT
#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
static int
mod_openssl_acme_tls_1 (SSL *ssl, handler_ctx *hctx)
{
buffer * const b = hctx->tmp_buf;
const buffer * const name = &hctx->r->uri.authority;
log_error_st * const errh = hctx->r->conf.errh;
X509 *ssl_pemfile_x509 = NULL;
STACK_OF(X509) *ssl_pemfile_chain = NULL;
EVP_PKEY *ssl_pemfile_pkey = NULL;
size_t len;
int rc = SSL_TLSEXT_ERR_ALERT_FATAL;
/* check if acme-tls/1 protocol is enabled (path to dir of cert(s) is set)*/
if (buffer_string_is_empty(hctx->conf.ssl_acme_tls_1))
return SSL_TLSEXT_ERR_NOACK; /*(reuse value here for not-configured)*/
buffer_copy_buffer(b, hctx->conf.ssl_acme_tls_1);
buffer_append_slash(b);
/* check if SNI set server name (required for acme-tls/1 protocol)
* and perform simple path checks for no '/'
* and no leading '.' (e.g. ignore "." or ".." or anything beginning '.') */
if (buffer_string_is_empty(name)) return rc;
if (NULL != strchr(name->ptr, '/')) return rc;
if (name->ptr[0] == '.') return rc;
#if 0
if (0 != http_request_host_policy(name,hctx->r->conf.http_parseopts,443))
return rc;
#endif
buffer_append_string_buffer(b, name);
len = buffer_string_length(b);
do {
buffer_append_string_len(b, CONST_STR_LEN(".crt.pem"));
ssl_pemfile_x509 =
mod_openssl_load_pem_file(b->ptr, errh, &ssl_pemfile_chain);
if (NULL == ssl_pemfile_x509) {
log_error(errh, __FILE__, __LINE__,
"SSL: Failed to load acme-tls/1 pemfile: %s", b->ptr);
break;
}
buffer_string_set_length(b, len); /*(remove ".crt.pem")*/
buffer_append_string_len(b, CONST_STR_LEN(".key.pem"));
ssl_pemfile_pkey = mod_openssl_evp_pkey_load_pem_file(b->ptr, errh);
if (NULL == ssl_pemfile_pkey) {
log_error(errh, __FILE__, __LINE__,
"SSL: Failed to load acme-tls/1 pemfile: %s", b->ptr);
break;
}
#if 0 /* redundant with below? */
if (!X509_check_private_key(ssl_pemfile_x509, ssl_pemfile_pkey)) {
log_error(errh, __FILE__, __LINE__,
"SSL: Private key does not match acme-tls/1 "
"certificate public key, reason: %s %s"
ERR_error_string(ERR_get_error(), NULL), b->ptr);
break;
}
#endif
/* first set certificate!
* setting private key checks whether certificate matches it */
if (1 != SSL_use_certificate(ssl, ssl_pemfile_x509)) {
log_error(errh, __FILE__, __LINE__,
"SSL: failed to set acme-tls/1 certificate for TLS server "
"name %s: %s", name->ptr, ERR_error_string(ERR_get_error(),NULL));
break;
}
if (ssl_pemfile_chain) {
SSL_set0_chain(ssl, ssl_pemfile_chain);
ssl_pemfile_chain = NULL;
}
if (1 != SSL_use_PrivateKey(ssl, ssl_pemfile_pkey)) {
log_error(errh, __FILE__, __LINE__,
"SSL: failed to set acme-tls/1 private key for TLS server "
"name %s: %s", name->ptr, ERR_error_string(ERR_get_error(),NULL));
break;
}
hctx->conf.ssl_verifyclient_enforce = 0;
SSL_set_verify(ssl, SSL_VERIFY_NONE, NULL);
rc = SSL_TLSEXT_ERR_OK;
} while (0);
if (ssl_pemfile_pkey) EVP_PKEY_free(ssl_pemfile_pkey);
if (ssl_pemfile_x509) X509_free(ssl_pemfile_x509);
if (ssl_pemfile_chain)
sk_X509_pop_free(ssl_pemfile_chain, X509_free);
return rc;
}
enum {
MOD_OPENSSL_ALPN_HTTP11 = 1
,MOD_OPENSSL_ALPN_HTTP10 = 2
,MOD_OPENSSL_ALPN_H2 = 3
,MOD_OPENSSL_ALPN_ACME_TLS_1 = 4
};
/* https://www.iana.org/assignments/tls-extensiontype-values/tls-extensiontype-values.xhtml#alpn-protocol-ids */
static int
mod_openssl_alpn_select_cb (SSL *ssl, const unsigned char **out, unsigned char *outlen, const unsigned char *in, unsigned int inlen, void *arg)
{
handler_ctx *hctx = (handler_ctx *) SSL_get_app_data(ssl);
unsigned short proto;
UNUSED(arg);
for (unsigned int i = 0, n; i < inlen; i += n) {
n = in[i++];
if (i+n > inlen || 0 == n) break;
switch (n) {
#if 0
case 2: /* "h2" */
if (in[i] == 'h' && in[i+1] == '2') {
proto = MOD_OPENSSL_ALPN_H2;
break;
}
continue;
#endif
case 8: /* "http/1.1" "http/1.0" */
if (0 == memcmp(in+i, "http/1.", 7)) {
if (in[i+7] == '1') {
proto = MOD_OPENSSL_ALPN_HTTP11;
break;
}
if (in[i+7] == '0') {
proto = MOD_OPENSSL_ALPN_HTTP10;
break;
}
}
continue;
case 10: /* "acme-tls/1" */
if (0 == memcmp(in+i, "acme-tls/1", 10)) {
int rc = mod_openssl_acme_tls_1(ssl, hctx);
if (rc == SSL_TLSEXT_ERR_OK) {
proto = MOD_OPENSSL_ALPN_ACME_TLS_1;
break;
}
/* (use SSL_TLSEXT_ERR_NOACK for not-configured) */
if (rc == SSL_TLSEXT_ERR_NOACK) continue;
return rc;
}
continue;
default:
continue;
}
hctx->alpn = proto;
*out = in+i;
*outlen = n;
return SSL_TLSEXT_ERR_OK;
}
#if OPENSSL_VERSION_NUMBER < 0x10100000L
return SSL_TLSEXT_ERR_NOACK;
#else
return SSL_TLSEXT_ERR_ALERT_FATAL;
#endif
}
#endif /* TLSEXT_TYPE_application_layer_protocol_negotiation */
#endif /* OPENSSL_NO_TLSEXT */
static int
network_openssl_ssl_conf_cmd (server *srv, plugin_config_socket *s)
{
#ifdef SSL_CONF_FLAG_CMDLINE
int rc = 0;
const data_string *ds;
SSL_CONF_CTX * const cctx = SSL_CONF_CTX_new();
SSL_CONF_CTX_set_ssl_ctx(cctx, s->ssl_ctx);
SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_FILE
| SSL_CONF_FLAG_SERVER
| SSL_CONF_FLAG_SHOW_ERRORS
| SSL_CONF_FLAG_CERTIFICATE);
/* always disable null and export ciphers */
ds = (const data_string *)
array_get_element_klen(s->ssl_conf_cmd,
CONST_STR_LEN("CipherString"));
if (NULL != ds) {
buffer *cipher_string =
array_get_buf_ptr(s->ssl_conf_cmd, CONST_STR_LEN("CipherString"));
buffer_append_string_len(cipher_string,
CONST_STR_LEN(":!aNULL:!eNULL:!EXP"));
}
for (size_t i = 0; i < s->ssl_conf_cmd->used; ++i) {
ds = (data_string *)s->ssl_conf_cmd->data[i];
ERR_clear_error();
if (SSL_CONF_cmd(cctx, ds->key.ptr, ds->value.ptr) <= 0) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: SSL_CONF_cmd %s %s: %s", ds->key.ptr, ds->value.ptr,
ERR_error_string(ERR_get_error(), NULL));
rc = -1;
break;
}
}
if (0 == rc && 1 != SSL_CONF_CTX_finish(cctx)) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: SSL_CONF_CTX_finish(): %s",
ERR_error_string(ERR_get_error(), NULL));
rc = -1;
}
SSL_CONF_CTX_free(cctx);
return rc;
#else
UNUSED(s);
log_error(srv->errh, __FILE__, __LINE__,
"SSL: ssl.openssl.ssl-conf-cmd not available; ignored");
return 0;
#endif
}
#ifndef OPENSSL_NO_DH
#if OPENSSL_VERSION_NUMBER < 0x10100000L \
|| defined(LIBRESSL_VERSION_NUMBER)
#define DH_set0_pqg(dh, dh_p, NULL, dh_g) \
((dh)->p = (dh_p), (dh)->g = (dh_g), (dh_p) != NULL && (dh_g != NULL))
#endif
/* https://tools.ietf.org/html/rfc7919#appendix-A.1
* A.1. ffdhe2048
*
* https://ssl-config.mozilla.org/ffdhe2048.txt
* C code generated with: openssl dhparam -C -in ffdhe2048.txt
*/
static DH *get_dh2048(void)
{
static unsigned char dhp_2048[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xAD, 0xF8,
0x54, 0x58, 0xA2, 0xBB, 0x4A, 0x9A, 0xAF, 0xDC, 0x56, 0x20,
0x27, 0x3D, 0x3C, 0xF1, 0xD8, 0xB9, 0xC5, 0x83, 0xCE, 0x2D,
0x36, 0x95, 0xA9, 0xE1, 0x36, 0x41, 0x14, 0x64, 0x33, 0xFB,
0xCC, 0x93, 0x9D, 0xCE, 0x24, 0x9B, 0x3E, 0xF9, 0x7D, 0x2F,
0xE3, 0x63, 0x63, 0x0C, 0x75, 0xD8, 0xF6, 0x81, 0xB2, 0x02,
0xAE, 0xC4, 0x61, 0x7A, 0xD3, 0xDF, 0x1E, 0xD5, 0xD5, 0xFD,
0x65, 0x61, 0x24, 0x33, 0xF5, 0x1F, 0x5F, 0x06, 0x6E, 0xD0,
0x85, 0x63, 0x65, 0x55, 0x3D, 0xED, 0x1A, 0xF3, 0xB5, 0x57,
0x13, 0x5E, 0x7F, 0x57, 0xC9, 0x35, 0x98, 0x4F, 0x0C, 0x70,
0xE0, 0xE6, 0x8B, 0x77, 0xE2, 0xA6, 0x89, 0xDA, 0xF3, 0xEF,
0xE8, 0x72, 0x1D, 0xF1, 0x58, 0xA1, 0x36, 0xAD, 0xE7, 0x35,
0x30, 0xAC, 0xCA, 0x4F, 0x48, 0x3A, 0x79, 0x7A, 0xBC, 0x0A,
0xB1, 0x82, 0xB3, 0x24, 0xFB, 0x61, 0xD1, 0x08, 0xA9, 0x4B,
0xB2, 0xC8, 0xE3, 0xFB, 0xB9, 0x6A, 0xDA, 0xB7, 0x60, 0xD7,
0xF4, 0x68, 0x1D, 0x4F, 0x42, 0xA3, 0xDE, 0x39, 0x4D, 0xF4,
0xAE, 0x56, 0xED, 0xE7, 0x63, 0x72, 0xBB, 0x19, 0x0B, 0x07,
0xA7, 0xC8, 0xEE, 0x0A, 0x6D, 0x70, 0x9E, 0x02, 0xFC, 0xE1,
0xCD, 0xF7, 0xE2, 0xEC, 0xC0, 0x34, 0x04, 0xCD, 0x28, 0x34,
0x2F, 0x61, 0x91, 0x72, 0xFE, 0x9C, 0xE9, 0x85, 0x83, 0xFF,
0x8E, 0x4F, 0x12, 0x32, 0xEE, 0xF2, 0x81, 0x83, 0xC3, 0xFE,
0x3B, 0x1B, 0x4C, 0x6F, 0xAD, 0x73, 0x3B, 0xB5, 0xFC, 0xBC,
0x2E, 0xC2, 0x20, 0x05, 0xC5, 0x8E, 0xF1, 0x83, 0x7D, 0x16,
0x83, 0xB2, 0xC6, 0xF3, 0x4A, 0x26, 0xC1, 0xB2, 0xEF, 0xFA,
0x88, 0x6B, 0x42, 0x38, 0x61, 0x28, 0x5C, 0x97, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
static unsigned char dhg_2048[] = {
0x02
};
DH *dh = DH_new();
BIGNUM *p, *g;
if (dh == NULL)
return NULL;
p = BN_bin2bn(dhp_2048, sizeof(dhp_2048), NULL);
g = BN_bin2bn(dhg_2048, sizeof(dhg_2048), NULL);
if (p == NULL || g == NULL || !DH_set0_pqg(dh, p, NULL, g)) {
DH_free(dh);
BN_free(p);
BN_free(g);
return NULL;
}
return dh;
}
#endif
static int
network_init_ssl (server *srv, plugin_config_socket *s, plugin_data *p)
{
/* load SSL certificates */
#ifndef SSL_OP_NO_COMPRESSION
#define SSL_OP_NO_COMPRESSION 0
#endif
#ifndef SSL_MODE_RELEASE_BUFFERS /* OpenSSL >= 1.0.0 */
#define SSL_MODE_RELEASE_BUFFERS 0
#endif
long ssloptions = SSL_OP_ALL
| SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
| SSL_OP_NO_COMPRESSION;
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
s->ssl_ctx = (!s->ssl_use_sslv2 && !s->ssl_use_sslv3)
? SSL_CTX_new(TLS_server_method())
: SSL_CTX_new(SSLv23_server_method());
#else
s->ssl_ctx = SSL_CTX_new(SSLv23_server_method());
#endif
if (NULL == s->ssl_ctx) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: %s", ERR_error_string(ERR_get_error(), NULL));
return -1;
}
#ifdef SSL_OP_NO_RENEGOTIATION /* openssl 1.1.0 */
if (s->ssl_disable_client_renegotiation)
ssloptions |= SSL_OP_NO_RENEGOTIATION;
#endif
/* completely useless identifier;
* required for client cert verification to work with sessions */
if (0 == SSL_CTX_set_session_id_context(
s->ssl_ctx,(const unsigned char*)CONST_STR_LEN("lighttpd"))){
log_error(srv->errh, __FILE__, __LINE__,
"SSL: failed to set session context: %s",
ERR_error_string(ERR_get_error(), NULL));
return -1;
}
if (s->ssl_empty_fragments) {
#ifdef SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS
ssloptions &= ~SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
#else
ssloptions &= ~0x00000800L; /* hardcode constant */
log_error(srv->errh, __FILE__, __LINE__,
"WARNING: SSL: 'insert empty fragments' not supported by the "
"openssl version used to compile lighttpd with");
#endif
}
SSL_CTX_set_options(s->ssl_ctx, ssloptions);
SSL_CTX_set_info_callback(s->ssl_ctx, ssl_info_callback);
#ifndef HAVE_WOLFSSL_SSL_H /*(wolfSSL does not support SSLv2)*/
if (!s->ssl_use_sslv2 && 0 != SSL_OP_NO_SSLv2) {
/* disable SSLv2 */
if ((SSL_OP_NO_SSLv2
& SSL_CTX_set_options(s->ssl_ctx, SSL_OP_NO_SSLv2))
!= SSL_OP_NO_SSLv2) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: %s", ERR_error_string(ERR_get_error(), NULL));
return -1;
}
}
#endif
if (!s->ssl_use_sslv3 && 0 != SSL_OP_NO_SSLv3) {
/* disable SSLv3 */
if ((SSL_OP_NO_SSLv3
& SSL_CTX_set_options(s->ssl_ctx, SSL_OP_NO_SSLv3))
!= SSL_OP_NO_SSLv3) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: %s", ERR_error_string(ERR_get_error(), NULL));
return -1;
}
}
if (!buffer_string_is_empty(s->ssl_cipher_list)) {
/* Disable support for low encryption ciphers */
if (SSL_CTX_set_cipher_list(s->ssl_ctx,s->ssl_cipher_list->ptr)!=1){
log_error(srv->errh, __FILE__, __LINE__,
"SSL: %s", ERR_error_string(ERR_get_error(), NULL));
return -1;
}
if (s->ssl_honor_cipher_order) {
SSL_CTX_set_options(s->ssl_ctx,SSL_OP_CIPHER_SERVER_PREFERENCE);
}
}
#ifndef OPENSSL_NO_DH
{
DH *dh;
/* Support for Diffie-Hellman key exchange */
if (!buffer_string_is_empty(s->ssl_dh_file)) {
/* DH parameters from file */
BIO *bio;
bio = BIO_new_file((char *) s->ssl_dh_file->ptr, "r");
if (bio == NULL) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: Unable to open file %s", s->ssl_dh_file->ptr);
return -1;
}
dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
BIO_free(bio);
if (dh == NULL) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: PEM_read_bio_DHparams failed %s", s->ssl_dh_file->ptr);
return -1;
}
} else {
dh = get_dh2048();
if (dh == NULL) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: get_dh2048() failed");
return -1;
}
}
SSL_CTX_set_tmp_dh(s->ssl_ctx,dh);
SSL_CTX_set_options(s->ssl_ctx,SSL_OP_SINGLE_DH_USE);
DH_free(dh);
}
#else
if (!buffer_string_is_empty(s->ssl_dh_file)) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: openssl compiled without DH support, "
"can't load parameters from %s", s->ssl_dh_file->ptr);
}
#endif
#if OPENSSL_VERSION_NUMBER >= 0x0090800fL
#ifndef OPENSSL_NO_ECDH
{
int nid = 0;
/* Support for Elliptic-Curve Diffie-Hellman key exchange */
if (!buffer_string_is_empty(s->ssl_ec_curve)) {
/* OpenSSL only supports the "named curves"
* from RFC 4492, section 5.1.1. */
nid = OBJ_sn2nid((char *) s->ssl_ec_curve->ptr);
if (nid == 0) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: Unknown curve name %s", s->ssl_ec_curve->ptr);
return -1;
}
} else {
#if OPENSSL_VERSION_NUMBER < 0x10002000
/* Default curve */
nid = OBJ_sn2nid("prime256v1");
#elif OPENSSL_VERSION_NUMBER < 0x10100000L \
|| defined(LIBRESSL_VERSION_NUMBER)
if (!SSL_CTX_set_ecdh_auto(s->ssl_ctx, 1)) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: SSL_CTX_set_ecdh_auto() failed");
}
#endif
}
if (nid) {
EC_KEY *ecdh;
ecdh = EC_KEY_new_by_curve_name(nid);
if (ecdh == NULL) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: Unable to create curve %s", s->ssl_ec_curve->ptr);
return -1;
}
SSL_CTX_set_tmp_ecdh(s->ssl_ctx,ecdh);
SSL_CTX_set_options(s->ssl_ctx,SSL_OP_SINGLE_ECDH_USE);
EC_KEY_free(ecdh);
}
}
#endif
#endif
#if OPENSSL_VERSION_NUMBER >= 0x10002000
SSL_CTX_set_cert_cb(s->ssl_ctx, mod_openssl_cert_cb, NULL);
UNUSED(p);
#else /* OPENSSL_VERSION_NUMBER < 0x10002000 */
/* load all ssl.ca-files specified in the config into each SSL_CTX
* XXX: This might be a bit excessive, but are all trusted CAs
* TODO: prefer to load on-demand in mod_openssl_cert_cb()
* for openssl >= 1.0.2 */
if (!mod_openssl_load_ca_files(s->ssl_ctx, p, srv))
return -1;
if (s->ssl_verifyclient) {
if (NULL == s->ssl_ca_file) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: You specified ssl.verifyclient.activate "
"but no ssl.ca-file");
return -1;
}
/* WTH openssl? SSL_CTX_set_client_CA_list() calls set0_CA_list(),
* but there is no set1_CA_list() to simply up the reference count
* (without needing to duplicate the list) */
STACK_OF(X509_NAME) * const cert_names = s->ssl_ca_dn_file
? s->ssl_ca_dn_file
: s->ssl_ca_file->names;
SSL_CTX_set_client_CA_list(s->ssl_ctx, SSL_dup_CA_list(cert_names));
int mode = SSL_VERIFY_PEER;
if (s->ssl_verifyclient_enforce) {
mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
}
SSL_CTX_set_verify(s->ssl_ctx, mode, verify_callback);
SSL_CTX_set_verify_depth(s->ssl_ctx, s->ssl_verifyclient_depth + 1);
if (!buffer_string_is_empty(s->ssl_ca_crl_file)) {
X509_STORE *store = SSL_CTX_get_cert_store(s->ssl_ctx);
if (!mod_openssl_load_cacrls(store, s->ssl_ca_crl_file, srv))
return -1;
}
}
if (1 != SSL_CTX_use_certificate_chain_file(s->ssl_ctx,
s->pc->ssl_pemfile->ptr)) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: %s %s", ERR_error_string(ERR_get_error(), NULL),
s->pc->ssl_pemfile->ptr);
return -1;
}
if (1 != SSL_CTX_use_PrivateKey(s->ssl_ctx, s->pc->ssl_pemfile_pkey)) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: %s %s %s", ERR_error_string(ERR_get_error(), NULL),
s->pc->ssl_pemfile->ptr, s->pc->ssl_privkey->ptr);
return -1;
}
if (SSL_CTX_check_private_key(s->ssl_ctx) != 1) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: Private key does not match the certificate public key, "
"reason: %s %s %s", ERR_error_string(ERR_get_error(), NULL),
s->pc->ssl_pemfile->ptr, s->pc->ssl_privkey->ptr);
return -1;
}
#endif /* OPENSSL_VERSION_NUMBER < 0x10002000 */
SSL_CTX_set_default_read_ahead(s->ssl_ctx, s->ssl_read_ahead);
SSL_CTX_set_mode(s->ssl_ctx, SSL_CTX_get_mode(s->ssl_ctx)
| SSL_MODE_ENABLE_PARTIAL_WRITE
| SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER
| SSL_MODE_RELEASE_BUFFERS);
#ifndef OPENSSL_NO_TLSEXT
#ifdef SSL_CLIENT_HELLO_SUCCESS
SSL_CTX_set_client_hello_cb(s->ssl_ctx,mod_openssl_client_hello_cb,srv);
#else
if (!SSL_CTX_set_tlsext_servername_callback(
s->ssl_ctx, network_ssl_servername_callback) ||
!SSL_CTX_set_tlsext_servername_arg(s->ssl_ctx, srv)) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: failed to initialize TLS servername callback, "
"openssl library does not support TLS servername extension");
return -1;
}
#endif
#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
SSL_CTX_set_alpn_select_cb(s->ssl_ctx,mod_openssl_alpn_select_cb,NULL);
#endif
#endif
if (s->ssl_conf_cmd && s->ssl_conf_cmd->used) {
if (0 != network_openssl_ssl_conf_cmd(srv, s)) return -1;
}
return 0;
}
static int
mod_openssl_set_defaults_sockets(server *srv, plugin_data *p)
{
static const config_plugin_keys_t cpk[] = {
{ CONST_STR_LEN("ssl.engine"),
T_CONFIG_BOOL,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.cipher-list"),
T_CONFIG_STRING,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.honor-cipher-order"),
T_CONFIG_BOOL,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.dh-file"),
T_CONFIG_STRING,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.ec-curve"),
T_CONFIG_STRING,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.openssl.ssl-conf-cmd"),
T_CONFIG_ARRAY_KVSTRING,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.pemfile"), /* included to process global scope */
T_CONFIG_STRING,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.empty-fragments"),
T_CONFIG_BOOL,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.use-sslv2"),
T_CONFIG_BOOL,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.use-sslv3"),
T_CONFIG_BOOL,
T_CONFIG_SCOPE_CONNECTION }
,{ NULL, 0,
T_CONFIG_UNSET,
T_CONFIG_SCOPE_UNSET }
};
static const buffer default_ssl_cipher_list = { CONST_STR_LEN("HIGH"), 0 };
p->ssl_ctxs = calloc(srv->config_context->used, sizeof(plugin_ssl_ctx));
force_assert(p->ssl_ctxs);
int rc = HANDLER_GO_ON;
plugin_data_base srvplug;
memset(&srvplug, 0, sizeof(srvplug));
plugin_data_base * const ps = &srvplug;
if (!config_plugin_values_init(srv, ps, cpk, "mod_openssl"))
return HANDLER_ERROR;
plugin_config_socket defaults;
memset(&defaults, 0, sizeof(defaults));
defaults.ssl_honor_cipher_order = 1;
defaults.ssl_cipher_list = &default_ssl_cipher_list;
/* process and validate config directives for global and $SERVER["socket"]
* (init i to 0 if global context; to 1 to skip empty global context) */
for (int i = !ps->cvlist[0].v.u2[1]; i < ps->nconfig; ++i) {
config_cond_info cfginfo;
config_get_config_cond_info(&cfginfo, (uint32_t)ps->cvlist[i].k_id);
int is_socket_scope = (0 == i || cfginfo.comp == COMP_SERVER_SOCKET);
int count_not_engine = 0;
plugin_config_socket conf;
memcpy(&conf, &defaults, sizeof(conf));
/*(preserve prior behavior; not inherited)*/
/*(forcing inheritance might break existing configs where SSL is enabled
* by default in the global scope, but not $SERVER["socket"]=="*:80") */
conf.ssl_enabled = 0;
config_plugin_value_t *cpv = ps->cvlist + ps->cvlist[i].v.u2[0];
for (; -1 != cpv->k_id; ++cpv) {
/* ignore ssl.pemfile (k_id=6); included to process global scope */
if (!is_socket_scope && cpv->k_id != 6) {
log_error(srv->errh, __FILE__, __LINE__,
"%s is valid only in global scope or "
"$SERVER[\"socket\"] condition", cpk[cpv->k_id].k);
continue;
}
++count_not_engine;
switch (cpv->k_id) {
case 0: /* ssl.engine */
conf.ssl_enabled = (0 != cpv->v.u);
--count_not_engine;
break;
case 1: /* ssl.cipher-list */
conf.ssl_cipher_list = cpv->v.b;
break;
case 2: /* ssl.honor-cipher-order */
conf.ssl_honor_cipher_order = (0 != cpv->v.u);
break;
case 3: /* ssl.dh-file */
conf.ssl_dh_file = cpv->v.b;
break;
case 4: /* ssl.ec-curve */
conf.ssl_ec_curve = cpv->v.b;
break;
case 5: /* ssl.openssl.ssl-conf-cmd */
*(const array **)&conf.ssl_conf_cmd = cpv->v.a;
break;
case 6: /* ssl.pemfile */
/* ignore here; included to process global scope when
* ssl.pemfile is set, but ssl.engine is not "enable" */
break;
case 7: /* ssl.empty-fragments */
conf.ssl_empty_fragments = (0 != cpv->v.u);
log_error(srv->errh, __FILE__, __LINE__, "SSL: "
"ssl.empty-fragments is deprecated and will soon be "
"removed. If needed, use: ssl.openssl.ssl-conf-cmd = "
"(\"Options\" => \"EmptyFragments\")");
log_error(srv->errh, __FILE__, __LINE__, "SSL: "
"ssl.empty-fragments is a "
"counter-measure against a SSL 3.0/TLS 1.0 protocol "
"vulnerability affecting CBC ciphers, which cannot be handled"
" by some broken (Microsoft) SSL implementations.");
break;
case 8: /* ssl.use-sslv2 */
conf.ssl_use_sslv2 = (0 != cpv->v.u);
log_error(srv->errh, __FILE__, __LINE__, "SSL: "
"ssl.use-sslv2 is deprecated and will soon be removed. "
"Many modern TLS libraries no longer support SSLv2.");
break;
case 9: /* ssl.use-sslv3 */
conf.ssl_use_sslv3 = (0 != cpv->v.u);
log_error(srv->errh, __FILE__, __LINE__, "SSL: "
"ssl.use-sslv3 is deprecated and will soon be removed. "
"Many modern TLS libraries no longer support SSLv3. "
"If needed, use: "
"ssl.openssl.ssl-conf-cmd = (\"MinProtocol\" => \"SSLv3\")");
break;
default:/* should not happen */
break;
}
}
if (HANDLER_GO_ON != rc) break;
if (0 == i) memcpy(&defaults, &conf, sizeof(conf));
if (0 != i && !conf.ssl_enabled) continue;
/* fill plugin_config_socket with global context then $SERVER["socket"]
* only for directives directly in current $SERVER["socket"] condition*/
/*conf.pc = p->defaults.pc;*/
conf.ssl_ca_file = p->defaults.ssl_ca_file;
conf.ssl_ca_dn_file = p->defaults.ssl_ca_dn_file;
conf.ssl_ca_crl_file = p->defaults.ssl_ca_crl_file;
conf.ssl_verifyclient = p->defaults.ssl_verifyclient;
conf.ssl_verifyclient_enforce = p->defaults.ssl_verifyclient_enforce;
conf.ssl_verifyclient_depth = p->defaults.ssl_verifyclient_depth;
conf.ssl_read_ahead = p->defaults.ssl_read_ahead;
int sidx = ps->cvlist[i].k_id;
for (int j = !p->cvlist[0].v.u2[1]; j < p->nconfig; ++j) {
if (p->cvlist[j].k_id != sidx) continue;
/*if (0 == sidx) break;*//*(repeat to get ssl_pemfile,ssl_privkey)*/
cpv = p->cvlist + p->cvlist[j].v.u2[0];
for (; -1 != cpv->k_id; ++cpv) {
++count_not_engine;
switch (cpv->k_id) {
case 0: /* ssl.pemfile */
if (cpv->vtype == T_CONFIG_LOCAL)
conf.pc = cpv->v.v;
break;
case 2: /* ssl.ca-file */
if (cpv->vtype == T_CONFIG_LOCAL)
conf.ssl_ca_file = cpv->v.v;
break;
case 3: /* ssl.ca-dn-file */
if (cpv->vtype == T_CONFIG_LOCAL)
conf.ssl_ca_dn_file = cpv->v.v;
break;
case 4: /* ssl.ca-crl-file */
conf.ssl_ca_crl_file = cpv->v.b;
break;
case 5: /* ssl.read-ahead */
conf.ssl_read_ahead = (0 != cpv->v.u);
break;
case 6: /* ssl.disable-client-renegotiation */
conf.ssl_disable_client_renegotiation = (0 != cpv->v.u);
break;
case 7: /* ssl.verifyclient.activate */
conf.ssl_verifyclient = (0 != cpv->v.u);
break;
case 8: /* ssl.verifyclient.enforce */
conf.ssl_verifyclient_enforce = (0 != cpv->v.u);
break;
case 9: /* ssl.verifyclient.depth */
conf.ssl_verifyclient_depth = (unsigned char)cpv->v.shrt;
break;
default:
break;
}
}
break;
}
if (NULL == conf.pc) {
if (0 == i && !conf.ssl_enabled) continue;
if (0 != i) {
/* inherit ssl settings from global scope
* (if only ssl.engine = "enable" and no other ssl.* settings)
* (This is for convenience when defining both IPv4 and IPv6
* and desiring to inherit the ssl config from global context
* without having to duplicate the directives)*/
if (count_not_engine) {
log_error(srv->errh, __FILE__, __LINE__,
"ssl.pemfile has to be set in same $SERVER[\"socket\"] scope "
"as other ssl.* directives, unless only ssl.engine is set, "
"inheriting ssl.* from global scope");
rc = HANDLER_ERROR;
continue;
}
plugin_ssl_ctx * const s = p->ssl_ctxs + sidx;
*s = *p->ssl_ctxs;/*(copy struct of ssl_ctx from global scope)*/
continue;
}
/* PEM file is required */
log_error(srv->errh, __FILE__, __LINE__,
"ssl.pemfile has to be set when ssl.engine = \"enable\"");
rc = HANDLER_ERROR;
continue;
}
/* configure ssl_ctx for socket */
/*conf.ssl_ctx = NULL;*//*(filled by network_init_ssl() even on error)*/
if (0 == network_init_ssl(srv, &conf, p)) {
plugin_ssl_ctx * const s = p->ssl_ctxs + sidx;
s->ssl_ctx = conf.ssl_ctx;
}
else {
SSL_CTX_free(conf.ssl_ctx);
rc = HANDLER_ERROR;
}
}
#ifdef TLSEXT_TYPE_session_ticket
if (rc == HANDLER_GO_ON) {
mod_openssl_session_ticket_key_rotate(srv, p);
stek_rotate_ts = log_epoch_secs;
}
#endif
free(srvplug.cvlist);
return rc;
}
SETDEFAULTS_FUNC(mod_openssl_set_defaults)
{
static const config_plugin_keys_t cpk[] = {
{ CONST_STR_LEN("ssl.pemfile"),
T_CONFIG_STRING,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.privkey"),
T_CONFIG_STRING,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.ca-file"),
T_CONFIG_STRING,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.ca-dn-file"),
T_CONFIG_STRING,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.ca-crl-file"),
T_CONFIG_STRING,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.read-ahead"),
T_CONFIG_BOOL,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.disable-client-renegotiation"),
T_CONFIG_BOOL,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.verifyclient.activate"),
T_CONFIG_BOOL,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.verifyclient.enforce"),
T_CONFIG_BOOL,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.verifyclient.depth"),
T_CONFIG_SHORT,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.verifyclient.username"),
T_CONFIG_STRING,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.verifyclient.exportcert"),
T_CONFIG_BOOL,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("ssl.acme-tls-1"),
T_CONFIG_STRING,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("debug.log-ssl-noise"),
T_CONFIG_BOOL,
T_CONFIG_SCOPE_CONNECTION }
,{ NULL, 0,
T_CONFIG_UNSET,
T_CONFIG_SCOPE_UNSET }
};
plugin_data * const p = p_d;
p->srv = srv;
p->cafiles = array_init(0);
if (!config_plugin_values_init(srv, p, cpk, "mod_openssl"))
return HANDLER_ERROR;
const buffer *default_ssl_ca_crl_file = NULL;
/* process and validate config directives
* (init i to 0 if global context; to 1 to skip empty global context) */
for (int i = !p->cvlist[0].v.u2[1]; i < p->nconfig; ++i) {
config_plugin_value_t *cpv = p->cvlist + p->cvlist[i].v.u2[0];
config_plugin_value_t *pemfile = NULL;
config_plugin_value_t *privkey = NULL;
const buffer *ssl_ca_file = NULL;
const buffer *ssl_ca_dn_file = NULL;
const buffer *ssl_ca_crl_file = NULL;
X509_STORE *ca_store = NULL;
for (; -1 != cpv->k_id; ++cpv) {
switch (cpv->k_id) {
case 0: /* ssl.pemfile */
if (!buffer_string_is_empty(cpv->v.b)) pemfile = cpv;
break;
case 1: /* ssl.privkey */
if (!buffer_string_is_empty(cpv->v.b)) privkey = cpv;
break;
case 2: /* ssl.ca-file */
if (buffer_string_is_empty(cpv->v.b)) break;
if (!mod_openssl_init_once_openssl(srv)) return HANDLER_ERROR;
ssl_ca_file = cpv->v.b;
cpv->v.v = mod_openssl_load_cacerts(ssl_ca_file, srv->errh);
if (NULL != cpv->v.v) {
cpv->vtype = T_CONFIG_LOCAL;
ca_store = ((plugin_cacerts *)cpv->v.v)->certs;
}
else {
log_error(srv->errh, __FILE__, __LINE__, "SSL: %s %s",
ERR_error_string(ERR_get_error(), NULL),
ssl_ca_file->ptr);
return HANDLER_ERROR;
}
break;
case 3: /* ssl.ca-dn-file */
if (buffer_string_is_empty(cpv->v.b)) break;
if (!mod_openssl_init_once_openssl(srv)) return HANDLER_ERROR;
ssl_ca_dn_file = cpv->v.b;
cpv->v.v = SSL_load_client_CA_file(ssl_ca_dn_file->ptr);
if (NULL != cpv->v.v) {
cpv->vtype = T_CONFIG_LOCAL;
}
else {
log_error(srv->errh, __FILE__, __LINE__, "SSL: %s %s",
ERR_error_string(ERR_get_error(), NULL),
ssl_ca_dn_file->ptr);
return HANDLER_ERROR;
}
break;
case 4: /* ssl.ca-crl-file */
if (buffer_string_is_empty(cpv->v.b)) break;
ssl_ca_crl_file = cpv->v.b;
if (0 == i) default_ssl_ca_crl_file = cpv->v.b;
break;
case 5: /* ssl.read-ahead */
case 6: /* ssl.disable-client-renegotiation */
case 7: /* ssl.verifyclient.activate */
case 8: /* ssl.verifyclient.enforce */
break;
case 9: /* ssl.verifyclient.depth */
if (cpv->v.shrt > 255) {
log_error(srv->errh, __FILE__, __LINE__,
"%s is absurdly large (%hu); limiting to 255",
cpk[cpv->k_id].k, cpv->v.shrt);
cpv->v.shrt = 255;
}
break;
case 10:/* ssl.verifyclient.username */
case 11:/* ssl.verifyclient.exportcert */
case 12:/* ssl.acme-tls-1 */
case 13:/* debug.log-ssl-noise */
break;
default:/* should not happen */
break;
}
}
#if OPENSSL_VERSION_NUMBER < 0x10002000 /* p->cafiles for legacy only */
/* load all ssl.ca-files into a single chain */
/*(certificate load order might matter)*/
if (ssl_ca_dn_file)
array_insert_value(p->cafiles, CONST_BUF_LEN(ssl_ca_dn_file));
if (ssl_ca_file)
array_insert_value(p->cafiles, CONST_BUF_LEN(ssl_ca_file));
UNUSED(ca_store);
UNUSED(ssl_ca_crl_file);
UNUSED(default_ssl_ca_crl_file);
#else
if (NULL == ca_store && ssl_ca_crl_file && i != 0) {
log_error(srv->errh, __FILE__, __LINE__,
"ssl.ca-crl-file (%s) ignored unless issued with ssl.ca-file",
ssl_ca_crl_file->ptr);
}
else if (ca_store && (ssl_ca_crl_file || default_ssl_ca_crl_file)) {
/* prior behavior in lighttpd allowed ssl.ca-crl-file only in global
* scope or $SERVER["socket"], so this inheritence from global scope
* is reasonable. This code does not implement inheritance of
* ssl.ca-crl-file from $SERVER["socket"] into nested $HTTP["host"],
* but the solution is to repeat ssl.ca-crl-file where ssl.ca-file
* is issued (and to not unnecessarily repeat ssl.ca-file)
* Alternative: write code to load ssl.ca-crl-file into (X509_CRL *)
* using PEM_read_bio_X509_CRL() and in mod_openssl_cert_cb(),
* create a new (X509_STORE *) which merges with CA (X509_STORE *)
* using X509_STORE_add_cert() and X509_STORE_add_crl(), and keeps
* the result in our (plugin_cert *) for reuse */
if (NULL == ssl_ca_crl_file)
ssl_ca_crl_file = default_ssl_ca_crl_file;
if (!mod_openssl_load_cacrls(ca_store, ssl_ca_crl_file, srv))
return HANDLER_ERROR;
}
#endif
if (pemfile) {
#ifdef OPENSSL_NO_TLSEXT
config_cond_info cfginfo;
uint32_t j = (uint32_t)p->cvlist[i].k_id;
config_get_config_cond_info(&cfginfo, j);
if (j > 0 && (COMP_SERVER_SOCKET != cfginfo.comp
|| cfginfo.cond != CONFIG_COND_EQ)) {
if (COMP_HTTP_HOST == cfginfo.comp)
log_error(srv->errh, __FILE__, __LINE__, "SSL:"
"can't use ssl.pemfile with $HTTP[\"host\"], "
"as openssl version does not support TLS extensions");
else
log_error(srv->errh, __FILE__, __LINE__, "SSL:"
"ssl.pemfile only works in SSL socket binding context "
"as openssl version does not support TLS extensions");
return HANDLER_ERROR;
}
#endif
if (NULL == privkey) privkey = pemfile;
pemfile->v.v =
network_openssl_load_pemfile(srv, pemfile->v.b, privkey->v.b);
if (pemfile->v.v)
pemfile->vtype = T_CONFIG_LOCAL;
else
return HANDLER_ERROR;
}
}
p->defaults.ssl_verifyclient = 0;
p->defaults.ssl_verifyclient_enforce = 1;
p->defaults.ssl_verifyclient_depth = 9;
p->defaults.ssl_verifyclient_export_cert = 0;
p->defaults.ssl_disable_client_renegotiation = 1;
p->defaults.ssl_read_ahead = 0;
/* initialize p->defaults from global config context */
if (p->nconfig > 0 && p->cvlist->v.u2[1]) {
const config_plugin_value_t *cpv = p->cvlist + p->cvlist->v.u2[0];
if (-1 != cpv->k_id)
mod_openssl_merge_config(&p->defaults, cpv);
}
return mod_openssl_set_defaults_sockets(srv, p);
}
static int
load_next_chunk (request_st * const r, chunkqueue * const cq, off_t max_bytes,
const char ** const data, size_t * const data_len)
{
chunk *c = cq->first;
/* local_send_buffer is a static buffer of size (LOCAL_SEND_BUFSIZE)
*
* it has to stay at the same location all the time to satisfy the needs
* of SSL_write to pass the SAME parameter in case of a _WANT_WRITE
*
* buffer is allocated once, is NOT realloced (note: not thread-safe)
*
* (Note: above restriction no longer true since SSL_CTX_set_mode() is
* called with SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)
* */
force_assert(NULL != c);
switch (c->type) {
case MEM_CHUNK:
*data = NULL;
*data_len = 0;
do {
size_t have;
force_assert(c->offset >= 0
&& c->offset <= (off_t)buffer_string_length(c->mem));
have = buffer_string_length(c->mem) - c->offset;
/* copy small mem chunks into single large buffer before SSL_write()
* to reduce number times write() called underneath SSL_write() and
* potentially reduce number of packets generated if TCP_NODELAY */
if (*data_len) {
size_t space = LOCAL_SEND_BUFSIZE - *data_len;
if (have > space)
have = space;
if (have > (size_t)max_bytes - *data_len)
have = (size_t)max_bytes - *data_len;
if (*data != local_send_buffer) {
memcpy(local_send_buffer, *data, *data_len);
*data = local_send_buffer;
}
memcpy(local_send_buffer+*data_len,c->mem->ptr+c->offset,have);
*data_len += have;
continue;
}
if ((off_t) have > max_bytes) have = max_bytes;
*data = c->mem->ptr + c->offset;
*data_len = have;
} while ((c = c->next) && c->type == MEM_CHUNK
&& *data_len < LOCAL_SEND_BUFSIZE
&& (off_t) *data_len < max_bytes);
return 0;
case FILE_CHUNK:
if (0 != chunkqueue_open_file_chunk(cq, r->conf.errh)) return -1;
{
off_t offset, toSend;
force_assert(c->offset >= 0 && c->offset <= c->file.length);
offset = c->file.start + c->offset;
toSend = c->file.length - c->offset;
if (toSend > LOCAL_SEND_BUFSIZE) toSend = LOCAL_SEND_BUFSIZE;
if (toSend > max_bytes) toSend = max_bytes;
if (-1 == lseek(c->file.fd, offset, SEEK_SET)) {
log_perror(r->conf.errh, __FILE__, __LINE__, "lseek");
return -1;
}
if (-1 == (toSend = read(c->file.fd, local_send_buffer, toSend))) {
log_perror(r->conf.errh, __FILE__, __LINE__, "read");
return -1;
}
*data = local_send_buffer;
*data_len = toSend;
}
return 0;
}
return -1;
}
static int
mod_openssl_close_notify(handler_ctx *hctx);
static int
connection_write_cq_ssl (connection *con, chunkqueue *cq, off_t max_bytes)
{
request_st * const r = &con->request;
handler_ctx *hctx = r->plugin_ctx[plugin_data_singleton->id];
SSL *ssl = hctx->ssl;
if (0 != hctx->close_notify) return mod_openssl_close_notify(hctx);
chunkqueue_remove_finished_chunks(cq);
while (max_bytes > 0 && NULL != cq->first) {
const char *data;
size_t data_len;
int wr;
if (0 != load_next_chunk(r, cq, max_bytes, &data, &data_len)) return -1;
/**
* SSL_write man-page
*
* WARNING
* When an SSL_write() operation has to be repeated because of
* SSL_ERROR_WANT_READ or SSL_ERROR_WANT_WRITE, it must be
* repeated with the same arguments.
*/
ERR_clear_error();
wr = SSL_write(ssl, data, data_len);
if (hctx->renegotiations > 1
&& hctx->conf.ssl_disable_client_renegotiation) {
log_error(r->conf.errh, __FILE__, __LINE__,
"SSL: renegotiation initiated by client, killing connection");
return -1;
}
if (wr <= 0) {
int ssl_r;
unsigned long err;
switch ((ssl_r = SSL_get_error(ssl, wr))) {
case SSL_ERROR_WANT_READ:
con->is_readable = -1;
return 0; /* try again later */
case SSL_ERROR_WANT_WRITE:
con->is_writable = -1;
return 0; /* try again later */
case SSL_ERROR_SYSCALL:
/* perhaps we have error waiting in our error-queue */
if (0 != (err = ERR_get_error())) {
do {
log_error(r->conf.errh, __FILE__, __LINE__,
"SSL: %d %d %s",ssl_r,wr,ERR_error_string(err,NULL));
} while((err = ERR_get_error()));
} else if (wr == -1) {
/* no, but we have errno */
switch(errno) {
case EPIPE:
case ECONNRESET:
return -2;
default:
log_perror(r->conf.errh, __FILE__, __LINE__,
"SSL: %d %d", ssl_r, wr);
break;
}
} else {
/* neither error-queue nor errno ? */
log_perror(r->conf.errh, __FILE__, __LINE__,
"SSL (error): %d %d", ssl_r, wr);
}
break;
case SSL_ERROR_ZERO_RETURN:
/* clean shutdown on the remote side */
if (wr == 0) return -2;
/* fall through */
default:
while((err = ERR_get_error())) {
log_error(r->conf.errh, __FILE__, __LINE__,
"SSL: %d %d %s", ssl_r, wr, ERR_error_string(err, NULL));
}
break;
}
return -1;
}
chunkqueue_mark_written(cq, wr);
max_bytes -= wr;
if ((size_t) wr < data_len) break; /* try again later */
}
return 0;
}
static int
connection_read_cq_ssl (connection *con, chunkqueue *cq, off_t max_bytes)
{
request_st * const r = &con->request;
handler_ctx *hctx = r->plugin_ctx[plugin_data_singleton->id];
int len;
char *mem = NULL;
size_t mem_len = 0;
UNUSED(max_bytes);
if (0 != hctx->close_notify) return mod_openssl_close_notify(hctx);
ERR_clear_error();
do {
len = SSL_pending(hctx->ssl);
mem_len = len < 2048 ? 2048 : (size_t)len;
chunk * const ckpt = cq->last;
mem = chunkqueue_get_memory(cq, &mem_len);
len = SSL_read(hctx->ssl, mem, mem_len);
if (len > 0) {
chunkqueue_use_memory(cq, ckpt, len);
con->bytes_read += len;
} else {
chunkqueue_use_memory(cq, ckpt, 0);
}
if (hctx->renegotiations > 1
&& hctx->conf.ssl_disable_client_renegotiation) {
log_error(r->conf.errh, __FILE__, __LINE__,
"SSL: renegotiation initiated by client, killing connection");
return -1;
}
#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
if (hctx->alpn) {
if (hctx->alpn == MOD_OPENSSL_ALPN_ACME_TLS_1) {
chunkqueue_reset(cq);
/* initiate handshake in order to send ServerHello.
* Once TLS handshake is complete, return -1 to result in
* CON_STATE_ERROR so that socket connection is quickly closed*/
if (1 == SSL_do_handshake(hctx->ssl)) return -1;
len = -1;
break;
}
hctx->alpn = 0;
}
#endif
} while (len > 0
&& (hctx->conf.ssl_read_ahead || SSL_pending(hctx->ssl) > 0));
if (len < 0) {
int oerrno = errno;
int rc, ssl_err;
switch ((rc = SSL_get_error(hctx->ssl, len))) {
case SSL_ERROR_WANT_WRITE:
con->is_writable = -1;
/* fall through */
case SSL_ERROR_WANT_READ:
con->is_readable = 0;
/* the manual says we have to call SSL_read with the same arguments
* next time. we ignore this restriction; no one has complained
* about it in 1.5 yet, so it probably works anyway.
*/
return 0;
case SSL_ERROR_SYSCALL:
/**
* man SSL_get_error()
*
* SSL_ERROR_SYSCALL
* Some I/O error occurred. The OpenSSL error queue may contain
* more information on the error. If the error queue is empty
* (i.e. ERR_get_error() returns 0), ret can be used to find out
* more about the error: If ret == 0, an EOF was observed that
* violates the protocol. If ret == -1, the underlying BIO
* reported an I/O error (for socket I/O on Unix systems, consult
* errno for details).
*
*/
while((ssl_err = ERR_get_error())) {
/* get all errors from the error-queue */
log_error(r->conf.errh, __FILE__, __LINE__,
"SSL: %d %s", rc, ERR_error_string(ssl_err, NULL));
}
switch(oerrno) {
case ECONNRESET:
if (!hctx->conf.ssl_log_noise) break;
/* fall through */
default:
/* (oerrno should be something like ECONNABORTED not 0
* if client disconnected before anything was sent
* (e.g. TCP connection probe), but it does not appear
* that openssl provides such notification, not even
* something like SSL_R_SSL_HANDSHAKE_FAILURE) */
if (0==oerrno && 0==cq->bytes_in && !hctx->conf.ssl_log_noise)
break;
log_error(r->conf.errh, __FILE__, __LINE__,
"SSL: %d %d %d %s", len, rc, oerrno, strerror(oerrno));
break;
}
break;
case SSL_ERROR_ZERO_RETURN:
/* clean shutdown on the remote side */
if (rc == 0) {
/* FIXME: later */
}
/* fall through */
default:
while((ssl_err = ERR_get_error())) {
switch (ERR_GET_REASON(ssl_err)) {
case SSL_R_SSL_HANDSHAKE_FAILURE:
#ifdef SSL_R_UNEXPECTED_EOF_WHILE_READING
case SSL_R_UNEXPECTED_EOF_WHILE_READING:
#endif
#ifdef SSL_R_TLSV1_ALERT_UNKNOWN_CA
case SSL_R_TLSV1_ALERT_UNKNOWN_CA:
#endif
#ifdef SSL_R_SSLV3_ALERT_CERTIFICATE_UNKNOWN
case SSL_R_SSLV3_ALERT_CERTIFICATE_UNKNOWN:
#endif
#ifdef SSL_R_SSLV3_ALERT_BAD_CERTIFICATE
case SSL_R_SSLV3_ALERT_BAD_CERTIFICATE:
#endif
if (!hctx->conf.ssl_log_noise) continue;
break;
default:
break;
}
/* get all errors from the error-queue */
log_error(r->conf.errh, __FILE__, __LINE__,
"SSL: %d %s", rc, ERR_error_string(ssl_err, NULL));
}
break;
}
return -1;
} else if (len == 0) {
con->is_readable = 0;
/* the other end close the connection -> KEEP-ALIVE */
return -2;
} else {
return 0;
}
}
CONNECTION_FUNC(mod_openssl_handle_con_accept)
{
server_socket *srv_sock = con->srv_socket;
if (!srv_sock->is_ssl) return HANDLER_GO_ON;
plugin_data *p = p_d;
handler_ctx * const hctx = handler_ctx_init();
request_st * const r = &con->request;
hctx->r = r;
hctx->con = con;
hctx->tmp_buf = con->srv->tmp_buf;
r->plugin_ctx[p->id] = hctx;
plugin_ssl_ctx * const s = p->ssl_ctxs + srv_sock->sidx;
hctx->ssl = SSL_new(s->ssl_ctx);
if (NULL != hctx->ssl
&& SSL_set_app_data(hctx->ssl, hctx)
&& SSL_set_fd(hctx->ssl, con->fd)) {
SSL_set_accept_state(hctx->ssl);
con->network_read = connection_read_cq_ssl;
con->network_write = connection_write_cq_ssl;
con->proto_default_port = 443; /* "https" */
mod_openssl_patch_config(r, &hctx->conf);
return HANDLER_GO_ON;
}
else {
log_error(r->conf.errh, __FILE__, __LINE__,
"SSL: %s", ERR_error_string(ERR_get_error(), NULL));
return HANDLER_ERROR;
}
}
static void
mod_openssl_detach(handler_ctx *hctx)
{
/* step aside from further SSL processing
* (used after handle_connection_shut_wr hook) */
/* future: might restore prior network_read and network_write fn ptrs */
hctx->con->is_ssl_sock = 0;
/* if called after handle_connection_shut_wr hook, shutdown SHUT_WR */
if (-1 == hctx->close_notify) shutdown(hctx->con->fd, SHUT_WR);
hctx->close_notify = 1;
}
CONNECTION_FUNC(mod_openssl_handle_con_shut_wr)
{
request_st * const r = &con->request;
plugin_data *p = p_d;
handler_ctx *hctx = r->plugin_ctx[p->id];
if (NULL == hctx) return HANDLER_GO_ON;
hctx->close_notify = -2;
if (SSL_is_init_finished(hctx->ssl)) {
mod_openssl_close_notify(hctx);
}
else {
mod_openssl_detach(hctx);
}
return HANDLER_GO_ON;
}
static int
mod_openssl_close_notify(handler_ctx *hctx)
{
int ret, ssl_r;
unsigned long err;
log_error_st *errh;
if (1 == hctx->close_notify) return -2;
ERR_clear_error();
switch ((ret = SSL_shutdown(hctx->ssl))) {
case 1:
mod_openssl_detach(hctx);
return -2;
case 0:
/* Drain SSL read buffers in case pending records need processing.
* Limit to reading next record to avoid denial of service when CPU
* processing TLS is slower than arrival speed of TLS data packets.
* (unless hctx->conf.ssl_read_ahead is set)
*
* references:
*
* "New session ticket breaks bidirectional shutdown of TLS 1.3 connection"
* https://github.com/openssl/openssl/issues/6262
*
* The peer is still allowed to send data after receiving the
* "close notify" event. If the peer did send data it need to be
* processed by calling SSL_read() before calling SSL_shutdown() a
* second time. SSL_read() will indicate the end of the peer data by
* returning <= 0 and SSL_get_error() returning
* SSL_ERROR_ZERO_RETURN. It is recommended to call SSL_read()
* between SSL_shutdown() calls.
*
* Additional discussion in "Auto retry in shutdown"
* https://github.com/openssl/openssl/pull/6340
*/
ssl_r = SSL_pending(hctx->ssl);
if (ssl_r) {
do {
char buf[4096];
ret = SSL_read(hctx->ssl, buf, (int)sizeof(buf));
} while (ret > 0 && (hctx->conf.ssl_read_ahead||(ssl_r-=ret)));
}
ERR_clear_error();
switch ((ret = SSL_shutdown(hctx->ssl))) {
case 1:
mod_openssl_detach(hctx);
return -2;
case 0:
hctx->close_notify = -1;
return 0;
default:
break;
}
/* fall through */
default:
if (!SSL_is_init_finished(hctx->ssl)) {
mod_openssl_detach(hctx);
return -2;
}
switch ((ssl_r = SSL_get_error(hctx->ssl, ret))) {
case SSL_ERROR_ZERO_RETURN:
case SSL_ERROR_WANT_WRITE:
case SSL_ERROR_WANT_READ:
hctx->close_notify = -1;
return 0; /* try again later */