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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)
*/
/*
* Note: If session tickets are -not- disabled with
* ssl.openssl.ssl-conf-cmd = ("Options" => "-SessionTicket")
* mod_openssl rotates server ticket encryption key (STEK) every 8 hours
* and keeps the prior two STEKs around, so ticket lifetime is 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 unless ssl.stek-file is defined and maintained (preferred),
* or if some external job restarts 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, and if
* ssl.stek-file is not in use, then 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 8 hours if session tickets are enabled and
* multiple lighttpd workers are configured. Since that is likely disruptive,
* if multiple lighttpd workers are configured, ssl.stek-file should be
* defined and the file maintained externally.
*/
#include "first.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
/*(not needed)*/
/* correction; needed for:
* SSL_load_client_CA_file()
* X509_STORE_load_locations()
*/
/*#define OPENSSL_NO_STDIO*/
#ifndef USE_OPENSSL_KERBEROS
#ifndef OPENSSL_NO_KRB5
#define OPENSSL_NO_KRB5
#endif
#endif
#ifdef BORINGSSL_API_VERSION
#undef OPENSSL_NO_STDIO /* for X509_STORE_load_locations() */
#endif
#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>
#include <openssl/tls1.h>
#ifndef OPENSSL_NO_DH
#include <openssl/dh.h>
#endif
#ifndef OPENSSL_NO_OCSP
#include <openssl/ocsp.h>
#endif
#ifdef BORINGSSL_API_VERSION
/* BoringSSL purports to have some OCSP support */
#undef OPENSSL_NO_OCSP
#endif
#if OPENSSL_VERSION_NUMBER >= 0x0090800fL
#ifndef OPENSSL_NO_ECDH
#include <openssl/ecdh.h>
#endif
#endif
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
#include <openssl/core_names.h>
#endif
#include "base.h"
#include "fdevent.h"
#include "http_header.h"
#include "http_kv.h"
#include "log.h"
#include "plugin.h"
#include "safe_memclear.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;
buffer *ssl_stapling;
const buffer *ssl_pemfile;
const buffer *ssl_privkey;
const buffer *ssl_stapling_file;
time_t ssl_stapling_loadts;
time_t ssl_stapling_nextts;
char must_staple;
} 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;
const char *ssl_stek_file;
} 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 = con->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 alpn;
plugin_config conf;
buffer *tmp_buf;
log_error_st *errh;
} 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
/* ssl/ssl_local.h */
#define TLSEXT_KEYNAME_LENGTH 16
#define TLSEXT_TICK_KEY_LENGTH 32
/* openssl has a huge number of interfaces, but not the most useful;
* construct our own session ticket encryption key structure */
typedef struct tlsext_ticket_key_st {
time_t active_ts; /* tickets not issued w/ key until activation timestamp */
time_t expire_ts; /* key not valid after expiration timestamp */
unsigned char tick_key_name[TLSEXT_KEYNAME_LENGTH];
unsigned char tick_hmac_key[TLSEXT_TICK_KEY_LENGTH];
unsigned char tick_aes_key[TLSEXT_TICK_KEY_LENGTH];
} tlsext_ticket_key_t;
static tlsext_ticket_key_t session_ticket_keys[4];
static time_t stek_rotate_ts;
static int
mod_openssl_session_ticket_key_generate (time_t active_ts, time_t expire_ts)
{
/* 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 generation is not expected to fail)
*
* 3 keys are stored in session_ticket_keys[]
* The 4th element of session_ticket_keys[] is used for STEK construction
*/
/*(RAND_priv_bytes() not in openssl 1.1.0; introduced in openssl 1.1.1)*/
#if OPENSSL_VERSION_NUMBER < 0x10101000L \
|| defined(LIBRESSL_VERSION_NUMBER)
#define RAND_priv_bytes(x,sz) RAND_bytes((x),(sz))
#endif
if (RAND_bytes(session_ticket_keys[3].tick_key_name,
TLSEXT_KEYNAME_LENGTH) <= 0
|| RAND_priv_bytes(session_ticket_keys[3].tick_hmac_key,
TLSEXT_TICK_KEY_LENGTH) <= 0
|| RAND_priv_bytes(session_ticket_keys[3].tick_aes_key,
TLSEXT_TICK_KEY_LENGTH) <= 0)
return 0;
session_ticket_keys[3].active_ts = active_ts;
session_ticket_keys[3].expire_ts = expire_ts;
return 1;
}
static void
mod_openssl_session_ticket_key_rotate (void)
{
/* discard oldest key (session_ticket_keys[2]) and put newest key first
* 3 keys are stored in session_ticket_keys[0], [1], [2]
* session_ticket_keys[3] is used to construct and pass new STEK */
session_ticket_keys[2] = session_ticket_keys[1];
session_ticket_keys[1] = session_ticket_keys[0];
/*memmove(session_ticket_keys+1,
session_ticket_keys+0, sizeof(tlsext_ticket_key_t)*2);*/
session_ticket_keys[0] = session_ticket_keys[3];
OPENSSL_cleanse(session_ticket_keys+3, sizeof(tlsext_ticket_key_t));
}
static tlsext_ticket_key_t *
tlsext_ticket_key_get (void)
{
const time_t cur_ts = log_epoch_secs;
const int e = sizeof(session_ticket_keys)/sizeof(*session_ticket_keys) - 1;
for (int i = 0; i < e; ++i) {
if (session_ticket_keys[i].active_ts > cur_ts) continue;
if (session_ticket_keys[i].expire_ts < cur_ts) continue;
return &session_ticket_keys[i];
}
return NULL;
}
static tlsext_ticket_key_t *
tlsext_ticket_key_find (unsigned char key_name[16], int *refresh)
{
*refresh = 0;
const time_t cur_ts = log_epoch_secs;
const int e = sizeof(session_ticket_keys)/sizeof(*session_ticket_keys) - 1;
for (int i = 0; i < e; ++i) {
if (session_ticket_keys[i].expire_ts < cur_ts) continue;
if (0 == memcmp(session_ticket_keys[i].tick_key_name, key_name, 16))
return &session_ticket_keys[i];
if (session_ticket_keys[i].active_ts <= cur_ts)
*refresh = 1; /* newer active key is available */
}
return NULL;
}
static void
tlsext_ticket_wipe_expired (const time_t cur_ts)
{
const int e = sizeof(session_ticket_keys)/sizeof(*session_ticket_keys) - 1;
for (int i = 0; i < e; ++i) {
if (session_ticket_keys[i].expire_ts != 0
&& session_ticket_keys[i].expire_ts < cur_ts)
OPENSSL_cleanse(session_ticket_keys+i, sizeof(tlsext_ticket_key_t));
}
}
#if OPENSSL_VERSION_NUMBER < 0x30000000L
/* based on reference implementation from openssl 1.1.1g man page
* man SSL_CTX_set_tlsext_ticket_key_cb
* but mod_openssl code uses EVP_aes_256_cbc() instead of EVP_aes_128_cbc()
*/
static int
ssl_tlsext_ticket_key_cb (SSL *s, unsigned char key_name[16],
unsigned char iv[EVP_MAX_IV_LENGTH],
EVP_CIPHER_CTX *ctx, HMAC_CTX *hctx, int enc)
#else /* OPENSSL_VERSION_NUMBER >= 0x30000000L */
/* based on reference implementation from openssl 3.0.0 man page
* man SSL_CTX_set_tlsext_ticket_key_cb
*/
static int
ssl_tlsext_ticket_key_cb(SSL *s, unsigned char key_name[16],
unsigned char *iv, EVP_CIPHER_CTX *ctx,
EVP_MAC_CTX *hctx, int enc)
#endif
{
UNUSED(s);
if (enc) { /* create new session */
tlsext_ticket_key_t *k = tlsext_ticket_key_get();
if (NULL == k)
return 0; /* current key does not exist or is not valid */
memcpy(key_name, k->tick_key_name, 16);
if (RAND_bytes(iv, EVP_MAX_IV_LENGTH) <= 0)
return -1; /* insufficient random */
EVP_EncryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, k->tick_aes_key, iv);
#if OPENSSL_VERSION_NUMBER < 0x30000000L
HMAC_Init_ex(hctx, k->tick_hmac_key, sizeof(k->tick_hmac_key),
EVP_sha256(), NULL);
#else
OSSL_PARAM params[] = {
OSSL_PARAM_DEFN(OSSL_MAC_PARAM_KEY, OSSL_PARAM_OCTET_STRING,
k->tick_hmac_key, sizeof(k->tick_hmac_key)),
OSSL_PARAM_DEFN(OSSL_MAC_PARAM_DIGEST, OSSL_PARAM_UTF8_STRING,
"sha256", sizeof("sha256")),
OSSL_PARAM_END
};
EVP_MAC_CTX_set_params(hctx, params);
#endif
return 1;
}
else { /* retrieve session */
int refresh;
tlsext_ticket_key_t *k = tlsext_ticket_key_find(key_name, &refresh);
if (NULL == k)
return 0;
#if OPENSSL_VERSION_NUMBER < 0x30000000L
HMAC_Init_ex(hctx, k->tick_hmac_key, sizeof(k->tick_hmac_key),
EVP_sha256(), NULL);
#else
OSSL_PARAM params[] = {
OSSL_PARAM_DEFN(OSSL_KDF_PARAM_KEY, OSSL_PARAM_OCTET_STRING,
k->tick_hmac_key, sizeof(k->tick_hmac_key)),
OSSL_PARAM_DEFN(OSSL_MAC_PARAM_DIGEST, OSSL_PARAM_UTF8_STRING,
"sha256", sizeof("sha256")),
OSSL_PARAM_END
};
EVP_MAC_CTX_set_params(hctx, params);
#endif
EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, k->tick_aes_key, iv);
return refresh ? 2 : 1;
/* 'refresh' will trigger issuing new ticket for session
* even though the current ticket is still valid */
}
}
static int
mod_openssl_session_ticket_key_file (const char *fn)
{
/* session ticket encryption key (STEK)
*
* STEK file should be stored in non-persistent storage,
* e.g. /dev/shm/lighttpd/stek-file (in memory)
* with appropriate permissions set to keep stek-file from being
* read by other users. Where possible, systems should also be
* configured without swap.
*
* admin should schedule an independent job to periodically
* generate new STEK up to 3 times during key lifetime
* (lighttpd stores up to 3 keys)
*
* format of binary file is:
* 4-byte - format version (always 0; for use if format changes)
* 4-byte - activation timestamp
* 4-byte - expiration timestamp
* 16-byte - session ticket key name
* 32-byte - session ticket HMAC encrpytion key
* 32-byte - session ticket AES encrpytion key
*
* STEK file can be created with a command such as:
* dd if=/dev/random bs=1 count=80 status=none | \
* perl -e 'print pack("iii",0,time()+300,time()+86400),<>' \
* > STEK-file.$$ && mv STEK-file.$$ STEK-file
*
* The above delays activation time by 5 mins (+300 sec) to allow file to
* be propagated to other machines. (admin must handle this independently)
* If STEK generation is performed immediately prior to starting lighttpd,
* admin should activate keys immediately (without +300).
*/
int buf[23]; /* 92 bytes */
int rc = 0; /*(will retry on next check interval upon any error)*/
if (0 != fdevent_load_file_bytes((char *)buf,(off_t)sizeof(buf),0,fn,NULL))
return rc;
if (buf[0] == 0) { /*(format version 0)*/
session_ticket_keys[3].active_ts = buf[1];
session_ticket_keys[3].expire_ts = buf[2];
#ifndef __COVERITY__ /* intentional; hide from Coverity Scan */
/* intentionally copy 80 bytes into consecutive arrays
* tick_key_name[], tick_hmac_key[], tick_aes_key[] */
memcpy(&session_ticket_keys[3].tick_key_name, buf+3, 80);
#endif
rc = 1;
}
OPENSSL_cleanse(buf, sizeof(buf));
return rc;
}
static void
mod_openssl_session_ticket_key_check (const plugin_data *p, const time_t cur_ts)
{
int rotate = 0;
if (p->ssl_stek_file) {
struct stat st;
if (0 == stat(p->ssl_stek_file, &st) && st.st_mtime > stek_rotate_ts)
rotate = mod_openssl_session_ticket_key_file(p->ssl_stek_file);
tlsext_ticket_wipe_expired(cur_ts);
}
else if (cur_ts - 28800 >= stek_rotate_ts) /*(8 hours)*/
rotate = mod_openssl_session_ticket_key_generate(cur_ts, cur_ts+86400);
if (rotate) {
mod_openssl_session_ticket_key_rotate();
stek_rotate_ts = cur_ts;
}
}
#endif /* TLSEXT_TYPE_session_ticket */
#ifndef OPENSSL_NO_OCSP
#ifndef BORINGSSL_API_VERSION /* BoringSSL suggests using different API */
static int
ssl_tlsext_status_cb(SSL *ssl, void *arg)
{
#ifdef SSL_get_tlsext_status_type
if (TLSEXT_STATUSTYPE_ocsp != SSL_get_tlsext_status_type(ssl))
return SSL_TLSEXT_ERR_NOACK; /* ignore if not client OCSP request */
#endif
handler_ctx *hctx = (handler_ctx *) SSL_get_app_data(ssl);
buffer *ssl_stapling = hctx->conf.pc->ssl_stapling;
if (NULL == ssl_stapling) return SSL_TLSEXT_ERR_NOACK;
UNUSED(arg);
int len = (int)buffer_string_length(ssl_stapling);
/* OpenSSL and LibreSSL require copy (BoringSSL, too, if using compat API)*/
uint8_t *ocsp_resp = OPENSSL_malloc(len);
if (NULL == ocsp_resp)
return SSL_TLSEXT_ERR_NOACK; /* ignore OCSP request if error occurs */
memcpy(ocsp_resp, ssl_stapling->ptr, len);
if (!SSL_set_tlsext_status_ocsp_resp(ssl, ocsp_resp, len)) {
log_error(hctx->r->conf.errh, __FILE__, __LINE__,
"SSL: failed to set OCSP response for TLS server name %s: %s",
hctx->r->uri.authority.ptr, ERR_error_string(ERR_get_error(), NULL));
OPENSSL_free(ocsp_resp);
return SSL_TLSEXT_ERR_NOACK; /* ignore OCSP request if error occurs */
/*return SSL_TLSEXT_ERR_ALERT_FATAL;*/
}
return SSL_TLSEXT_ERR_OK;
}
#endif
#endif
INIT_FUNC(mod_openssl_init)
{
plugin_data_singleton = (plugin_data *)calloc(1, sizeof(plugin_data));
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) \
|| LIBRESSL_VERSION_NUMBER >= 0x2070000fL)
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;
#ifdef TLSEXT_TYPE_session_ticket
OPENSSL_cleanse(session_ticket_keys, sizeof(session_ticket_keys));
stek_rotate_ts = 0;
#endif
#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);
buffer_free(pc->ssl_stapling);
free(pc);
}
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;
}
}
}
}
/* 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()
*
* 'man PEM_bytes_read_bio_secmem()' and see NOTES section for more info
* 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 \
&& !defined(LIBRESSL_VERSION_NUMBER)
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);
#ifndef BORINGSSL_API_VERSION /* missing PEMerr() macro */
if (ret == NULL)
PEMerr(PEM_F_PEM_ASN1_READ_BIO, ERR_R_ASN1_LIB);
#endif
#if OPENSSL_VERSION_NUMBER >= 0x10101000L \
&& !defined(LIBRESSL_VERSION_NUMBER)
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 OPENSSL_VERSION_NUMBER >= 0x30000000L
if (1 != X509_STORE_load_file(store, ssl_ca_crl_file->ptr))
#else
if (1 != X509_STORE_load_locations(store, ssl_ca_crl_file->ptr, NULL))
#endif
{
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 \
|| defined(LIBRESSL_VERSION_NUMBER)
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:/* ssl.stapling-file */
break;
case 14:/* 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 \
&& !defined(LIBRESSL_VERSION_NUMBER)
/* libressl >= 0x3000000fL has SSL_set1_chain(), but not other APIs below)*/
if (pc->ssl_pemfile_chain)
SSL_set1_chain(ssl, pc->ssl_pemfile_chain);
#ifndef BORINGSSL_API_VERSION /* BoringSSL limitation */
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
#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;
}
#ifndef OPENSSL_NO_OCSP
#ifdef BORINGSSL_API_VERSION
/* BoringSSL suggests API different than SSL_CTX_set_tlsext_status_cb() */
buffer *ocsp_resp = pc->ssl_stapling;
if (NULL != ocsp_resp
&& !SSL_set_ocsp_response(ssl, (uint8_t *)CONST_BUF_LEN(ocsp_resp))) {
log_error(hctx->r->conf.errh, __FILE__, __LINE__,
"SSL: failed to set OCSP response for TLS server name %s: %s",
hctx->r->uri.authority.ptr, ERR_error_string(ERR_get_error(), NULL));
return 0;
}
#endif
#endif
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 \
&& !defined(LIBRESSL_VERSION_NUMBER)
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) */
/* WolfSSL does not support setting per-session CA list;
* limitation is to per-CTX CA list, and is not changed after SNI */
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 \
&& !defined(LIBRESSL_VERSION_NUMBER)
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 */
size_t len = strlen(servername);
int read_ahead = hctx->conf.ssl_read_ahead;
int rc = mod_openssl_SNI(hctx, servername, len);
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;
off_t dlen = 512*1024*1024;/*(arbitrary limit: 512 MB file; expect < 1 MB)*/
char *data = fdevent_load_file(file, &dlen, errh, malloc, free);
if (NULL == data) return NULL;
BIO *in = BIO_new_mem_buf(data, (int)dlen);
if (NULL == in) {
log_error(errh, __FILE__, __LINE__,
"SSL: BIO_new/BIO_read_filename('%s') failed", file);
if (dlen) safe_memclear(data, dlen);
free(data);
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);
if (dlen) safe_memclear(data, dlen);
free(data);
return x;
}
static EVP_PKEY *
mod_openssl_evp_pkey_load_pem_file (const char *file, log_error_st *errh)
{
off_t dlen = 512*1024*1024;/*(arbitrary limit: 512 MB file; expect < 1 MB)*/
char *data = fdevent_load_file(file, &dlen, errh, malloc, free);
if (NULL == data) return NULL;
EVP_PKEY *x = NULL;
BIO *in = BIO_new_mem_buf(data, (int)dlen);
if (NULL != in) {
x = PEM_read_bio_PrivateKey(in, NULL, NULL, NULL);
BIO_free(in);
}
if (dlen) safe_memclear(data, dlen);
free(data);
if (NULL == in)
log_error(errh, __FILE__, __LINE__,
"SSL: BIO_new/BIO_read_filename('%s') failed", file);
else if (NULL == x)
log_error(errh, __FILE__, __LINE__,
"SSL: couldn't read private key from '%s'", file);
return x;
}
#ifndef OPENSSL_NO_OCSP
static buffer *
mod_openssl_load_stapling_file (const char *file, log_error_st *errh, buffer *b)
{
/* load stapling .der into buffer *b only if successful
*
* Note: for some TLS libs, the OCSP stapling response is not copied when
* assigned to a session (and is reasonable since not changed frequently)
* - BoringSSL SSL_set_ocsp_response()
* - WolfSSL SSL_set_tlsext_status_ocsp_resp() (differs from OpenSSL API)
* Therefore, there is a potential race condition if the OCSP response is
* assigned to the session during the handshake and the Server Hello is
* partially sent, AND (unlikely, if possible at all), the TLS library is
* in the middle of reading this OSCP response buffer. If the OCSP response
* is replaced due to an updated ssl.stapling-file (checked periodically),
* AND the buffer is resized, this would be a problem. Resizing the buffer
* is unlikely since updated OSCP response for same certificate are
* typically the same size with the signature and dates refreshed.
*/
/* load raw .der file */
off_t dlen = 1*1024*1024;/*(arbitrary limit: 1 MB file; expect < 1 KB)*/
char *data = fdevent_load_file(file, &dlen, errh, malloc, free);
if (NULL == data) return NULL;
#if defined(BORINGSSL_API_VERSION)
if (NULL == b)
b = buffer_init();
else if (b->ptr)
free(b->ptr);
b->ptr = data;
b->used = (uint32_t)dlen;
b->size = (uint32_t)dlen+1;
return b;
#else
BIO *in = BIO_new_mem_buf(data, (int)dlen);
if (NULL == in) {
log_error(errh, __FILE__, __LINE__,
"SSL: BIO_new/BIO_read_filename('%s') failed", file);
free(data);
return NULL;
}
OCSP_RESPONSE *x = d2i_OCSP_RESPONSE_bio(in, NULL);
BIO_free(in);
free(data);
if (NULL == x) {
log_error(errh, __FILE__, __LINE__,
"SSL: OCSP stapling file read error: %s %s",
ERR_error_string(ERR_get_error(), NULL), file);
return NULL;
}
unsigned char *rspder = NULL;
int rspderlen = i2d_OCSP_RESPONSE(x, &rspder);
if (rspderlen > 0) {
if (NULL == b) b = buffer_init();
buffer_copy_string_len(b, (char *)rspder, (uint32_t)rspderlen);
}
OPENSSL_free(rspder);
OCSP_RESPONSE_free(x);
return rspderlen ? b : NULL;
#endif
}
#if !defined(BORINGSSL_API_VERSION)
static time_t
mod_openssl_asn1_time_to_posix (ASN1_TIME *asn1time)
{
#ifdef LIBRESSL_VERSION_NUMBER
/* LibreSSL was forked from OpenSSL 1.0.1; does not have ASN1_TIME_diff */
/*(Note: all certificate times are expected to use UTC)*/
/*(Note: does not strictly validate string contains appropriate digits)*/
/*(Note: incorrectly assumes GMT if 'Z' or offset not provided)*/
/*(Note: incorrectly ignores if local timezone might be in DST)*/
if (NULL == asn1time || NULL == asn1time->data) return (time_t)-1;
const char *s = (const char *)asn1time->data;
size_t len = strlen(s);
struct tm x;
x.tm_isdst = 0;
x.tm_yday = 0;
x.tm_wday = 0;
switch (asn1time->type) {
case V_ASN1_UTCTIME: /* 2-digit year */
if (len < 8) return (time_t)-1;
len -= 8;
x.tm_year = (s[0]-'0')*10 + (s[1]-'0');
x.tm_year += (x.tm_year < 50 ? 2000 : 1900);
s += 2;
break;
case V_ASN1_GENERALIZEDTIME: /* 4-digit year */
if (len < 10) return (time_t)-1;
len -= 10;
x.tm_year = (s[0]-'0')*1000+(s[1]-'0')*100+(s[2]-'0')*10+(s[3]-'0');
s += 4;
break;
default:
return (time_t)-1;
}
x.tm_mon = (s[0]-'0')*10 + (s[1]-'0');
x.tm_mday = (s[2]-'0')*10 + (s[3]-'0');
x.tm_hour = (s[4]-'0')*10 + (s[5]-'0');
x.tm_min = 0;
x.tm_sec = 0;
s += 6;
if (len >= 2 && s[0] != '+' && s[0] != '-' && s[0] != 'Z') {
len -= 2;
x.tm_min = (s[0]-'0')*10 + (s[1]-'0');
s += 2;
if (len >= 2 && s[0] != '+' && s[0] != '-' && s[0] != 'Z') {
len -= 2;
x.tm_sec = (s[0]-'0')*10 + (s[1]-'0');
s += 2;
if (len && s[0] == '.') {
/*(ignore .fff fractional seconds;
* should be up to 3 digits but we ignore more)*/
do { ++s; --len; } while (*s >= '0' && *s <= '9');
}
}
}
int offset = 0;
if ((*s == '-' || *s == '+') && len != 5) {
offset = ((s[1]-'0')*10 + (s[2]-'0')) * 3600
+ ((s[3]-'0')*10 + (s[4]-'0')) * 60;
if (*s == '-') offset = -offset;
}
else if (s[0] != '\0' && (s[0] != 'Z' || s[1] != '\0'))
return (time_t)-1;
if (x.tm_year == 9999 && x.tm_mon == 12 && x.tm_mday == 31
&& x.tm_hour == 23 && x.tm_min == 59 && x.tm_sec == 59 && s[0] == 'Z')
return (time_t)-1; // 99991231235959Z RFC 5280
#if 0
#if defined(_WIN32) && !defined(__CYGWIN__)
#define timegm(x) _mkgmtime(x)
#endif
/* timegm() might not be available, and mktime() is sensitive to TZ */
x.tm_year-= 1900;
x.tm_mon -= 1;
time_t t = timegm(&d);
return (t != (time_t)-1) ? t + offset : t;
#else
int y = x.tm_year;
int m = x.tm_mon;
int d = x.tm_mday;
/* days_from_civil() http://howardhinnant.github.io/date_algorithms.html */
y -= m <= 2;
int era = y / 400;
int yoe = y - era * 400; // [0, 399]
int doy = (153 * (m + (m > 2 ? -3 : 9)) + 2) / 5 + d - 1; // [0, 365]
int doe = yoe * 365 + yoe / 4 - yoe / 100 + doy; // [0, 146096]
int days_since_1970 = era * 146097 + doe - 719468;
return 60*(60*(24L*days_since_1970+x.tm_hour)+x.tm_min)+x.tm_sec+offset;
#endif
#else
/* Note: this does not check for integer overflow of time_t! */
int day, sec;
return ASN1_TIME_diff(&day, &sec, NULL, asn1time)
? log_epoch_secs + day*86400 + sec
: (time_t)-1;
#endif
}
#endif
static time_t
mod_openssl_ocsp_next_update (plugin_cert *pc)
{
#if defined(BORINGSSL_API_VERSION)
UNUSED(pc);
return (time_t)-1; /*(not implemented)*/
#else
buffer *der = pc->ssl_stapling;
const unsigned char *p = (unsigned char *)der->ptr; /*(p gets modified)*/
OCSP_RESPONSE *ocsp = d2i_OCSP_RESPONSE(NULL,&p,buffer_string_length(der));
if (NULL == ocsp) return (time_t)-1;
OCSP_BASICRESP *bs = OCSP_response_get1_basic(ocsp);
if (NULL == bs) {
OCSP_RESPONSE_free(ocsp);
return (time_t)-1;
}
/* XXX: should save and evaluate cert status returned by these calls */
ASN1_TIME *nextupd = NULL;
OCSP_single_get0_status(OCSP_resp_get0(bs, 0), NULL, NULL, NULL, &nextupd);
time_t t = nextupd ? mod_openssl_asn1_time_to_posix(nextupd) : (time_t)-1;
/* Note: trust external process which creates ssl.stapling-file to verify
* (as well as to validate certificate status)
* future: verify OCSP response here to double-check */
OCSP_BASICRESP_free(bs);
OCSP_RESPONSE_free(ocsp);
return t;
#endif
}
static int
mod_openssl_reload_stapling_file (server *srv, plugin_cert *pc, const time_t cur_ts)
{
buffer *b = mod_openssl_load_stapling_file(pc->ssl_stapling_file->ptr,
srv->errh, pc->ssl_stapling);
if (!b) return 0;
pc->ssl_stapling = b; /*(unchanged unless orig was NULL)*/
pc->ssl_stapling_loadts = cur_ts;
pc->ssl_stapling_nextts = mod_openssl_ocsp_next_update(pc);
if (pc->ssl_stapling_nextts == (time_t)-1) {
/* "Next Update" might not be provided by OCSP responder
* Use 3600 sec (1 hour) in that case. */
/* retry in 1 hour if unable to determine Next Update */
pc->ssl_stapling_nextts = cur_ts + 3600;
pc->ssl_stapling_loadts = 0;
}
return 1;
}
static int
mod_openssl_refresh_stapling_file (server *srv, plugin_cert *pc, const time_t cur_ts)
{
if (pc->ssl_stapling && pc->ssl_stapling_nextts - 256 > cur_ts)
return 1; /* skip check for refresh unless close to expire */
struct stat st;
if (0 != stat(pc->ssl_stapling_file->ptr, &st)
|| st.st_mtime <= pc->ssl_stapling_loadts) {
if (pc->ssl_stapling_nextts < cur_ts) {
/* discard expired OCSP stapling response */
buffer_free(pc->ssl_stapling);
pc->ssl_stapling = NULL;
if (pc->must_staple) {
log_error(srv->errh, __FILE__, __LINE__,
"certificate marked OCSP Must-Staple, "
"but OCSP response expired from ssl.stapling-file %s",
pc->ssl_stapling_file->ptr);
}
}
return 1;
}
return mod_openssl_reload_stapling_file(srv, pc, cur_ts);
}
static void
mod_openssl_refresh_stapling_files (server *srv, const plugin_data *p, const time_t cur_ts)
{
/* future: might construct array of (plugin_cert *) at startup
* to avoid the need to search for them here */
for (int i = 0, used = p->nconfig; i < used; ++i) {
const config_plugin_value_t *cpv = p->cvlist + p->cvlist[i].v.u2[0];
for (; cpv->k_id != -1; ++cpv) {
if (cpv->k_id != 0) continue; /* k_id == 0 for ssl.pemfile */
if (cpv->vtype != T_CONFIG_LOCAL) continue;
plugin_cert *pc = cpv->v.v;
if (!buffer_string_is_empty(pc->ssl_stapling_file))
mod_openssl_refresh_stapling_file(srv, pc, cur_ts);
}
}
}
static int
mod_openssl_crt_must_staple (const X509 *crt)
{
#if OPENSSL_VERSION_NUMBER < 0x10100000L \
|| defined(BORINGSSL_API_VERSION) \
|| defined(LIBRESSL_VERSION_NUMBER)
/*(not currently supported in BoringSSL or LibreSSL)*/
UNUSED(crt);
return 0;
#else
/* openssl/x509v3.h:typedef STACK_OF(ASN1_INTEGER) TLS_FEATURE; */
TLS_FEATURE *tlsf = X509_get_ext_d2i(crt, NID_tlsfeature, NULL, NULL);
if (NULL == tlsf) return 0;
int rc = 0;
for (int i = 0; i < sk_ASN1_INTEGER_num(tlsf); ++i) {
ASN1_INTEGER *ai = sk_ASN1_INTEGER_value(tlsf, i);
long tlsextid = ASN1_INTEGER_get(ai);
if (tlsextid == 5) { /* 5 = OCSP Must-Staple */
rc = 1;
break;
}
}
sk_ASN1_INTEGER_pop_free(tlsf, ASN1_INTEGER_free);
return rc; /* 1 if OCSP Must-Staple found; 0 if not */
#endif
}
#endif /* OPENSSL_NO_OCSP */
static plugin_cert *
network_openssl_load_pemfile (server *srv, const buffer *pemfile, const buffer *privkey, const buffer *ssl_stapling_file)
{
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;
pc->ssl_stapling = NULL;
pc->ssl_stapling_file= ssl_stapling_file;
pc->ssl_stapling_loadts = 0;
pc->ssl_stapling_nextts = 0;
#ifndef OPENSSL_NO_OCSP
pc->must_staple = mod_openssl_crt_must_staple(ssl_pemfile_x509);
#else
pc->must_staple = 0;
#endif
if (!buffer_string_is_empty(pc->ssl_stapling_file)) {
#ifndef OPENSSL_NO_OCSP
if (!mod_openssl_reload_stapling_file(srv, pc, log_epoch_secs)) {
/* continue without OCSP response if there is an error */
}
#else
log_error(srv->errh, __FILE__, __LINE__, "SSL:"
"OCSP stapling not supported; ignoring %s",
pc->ssl_stapling_file->ptr);
#endif
}
else if (pc->must_staple) {
log_error(srv->errh, __FILE__, __LINE__,
"certificate %s marked OCSP Must-Staple, "
"but ssl.stapling-file not provided", pemfile->ptr);
}
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) {
case 2: /* "h2" */
if (in[i] == 'h' && in[i+1] == '2') {
if (!hctx->r->conf.h2proto) continue;
proto = MOD_OPENSSL_ALPN_H2;
hctx->r->http_version = HTTP_VERSION_2;
break;
}
continue;
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 */
#if defined(BORINGSSL_API_VERSION) \
|| defined(LIBRESSL_VERSION_NUMBER)
static int
mod_openssl_ssl_conf_cmd (server *srv, plugin_config_socket *s);
#endif
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"));
if (buffer_string_is_empty(cipher_string))
buffer_append_string_len(cipher_string, CONST_STR_LEN("HIGH"));
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;
#elif defined(BORINGSSL_API_VERSION) \
|| defined(LIBRESSL_VERSION_NUMBER)
return mod_openssl_ssl_conf_cmd(srv, s);
#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
mod_openssl_ssl_conf_curves(server *srv, plugin_config_socket *s, const buffer *ssl_ec_curve)
{
#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(ssl_ec_curve)) {
/* OpenSSL only supports the "named curves"
* from RFC 4492, section 5.1.1. */
nid = OBJ_sn2nid((char *) ssl_ec_curve->ptr);
if (nid == 0) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: Unknown curve name %s", ssl_ec_curve->ptr);
return 0;
}
}
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", ssl_ec_curve->ptr);
return 0;
}
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
UNUSED(srv);
UNUSED(s);
UNUSED(ssl_ec_curve);
return 1;
}
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;
}
const int disable_sess_cache =
srv->srvconf.feature_flags
&& !config_plugin_value_tobool(
array_get_element_klen(srv->srvconf.feature_flags,
CONST_STR_LEN("ssl.session-cache")), 0);
if (disable_sess_cache)
/* disable session cache; session tickets are preferred */
SSL_CTX_set_session_cache_mode(s->ssl_ctx,
SSL_SESS_CACHE_OFF
| SSL_SESS_CACHE_NO_AUTO_CLEAR
| SSL_SESS_CACHE_NO_INTERNAL);
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);
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;
}
}
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);
}
}
#ifdef SSL_OP_PRIORITIZE_CHACHA /*(openssl 1.1.1)*/
if (s->ssl_honor_cipher_order)
SSL_CTX_set_options(s->ssl_ctx, SSL_OP_PRIORITIZE_CHACHA);
#endif
#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;
}
SSL_CTX_set_tmp_dh(s->ssl_ctx,dh);
DH_free(dh);
}
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);
DH_free(dh);
}
SSL_CTX_set_options(s->ssl_ctx,SSL_OP_SINGLE_DH_USE);
}
#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 (!mod_openssl_ssl_conf_curves(srv, s, s->ssl_ec_curve))
return -1;
#ifdef TLSEXT_TYPE_session_ticket
#if OPENSSL_VERSION_NUMBER < 0x30000000L
SSL_CTX_set_tlsext_ticket_key_cb(s->ssl_ctx, ssl_tlsext_ticket_key_cb);
#else /* OPENSSL_VERSION_NUMBER >= 0x30000000L */
SSL_CTX_set_tlsext_ticket_key_evp_cb(s->ssl_ctx,
ssl_tlsext_ticket_key_cb);
#endif
#endif
#ifndef OPENSSL_NO_OCSP
#ifndef BORINGSSL_API_VERSION /* BoringSSL suggests using different API */
SSL_CTX_set_tlsext_status_cb(s->ssl_ctx, ssl_tlsext_status_cb);
#endif
#endif
#if OPENSSL_VERSION_NUMBER >= 0x10002000 \
&& !defined(LIBRESSL_VERSION_NUMBER)
SSL_CTX_set_cert_cb(s->ssl_ctx, mod_openssl_cert_cb, NULL);
UNUSED(p);
#if defined(BORINGSSL_API_VERSION) /* BoringSSL limitation */
/* set cert store for auto-chaining
* BoringSSL does not support SSL_set1_chain_cert_store() in cert_cb */
if (s->ssl_ca_file && s->ssl_ca_file->certs) {
if (!X509_STORE_up_ref(s->ssl_ca_file->certs))
return -1;
SSL_CTX_set_cert_store(s->ssl_ctx, s->ssl_ca_file->certs);
}
#endif
#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) */
/* WTH wolfssl? wolfSSL_dup_CA_list() is a stub which returns NULL
* and so DN names in cert request are not set here.
* (A patch has been submitted to WolfSSL to correct this)*/
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 */
#if defined(BORINGSSL_API_VERSION)
#define SSL_CTX_set_default_read_ahead(ctx,m) \
SSL_CTX_set_read_ahead(ctx,m)
#endif
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 OPENSSL_VERSION_NUMBER >= 0x10100000L \
|| defined(BORINGSSL_API_VERSION) \
|| defined(LIBRESSL_VERSION_NUMBER)
if (!s->ssl_use_sslv3 && !s->ssl_use_sslv2
&& !SSL_CTX_set_min_proto_version(s->ssl_ctx, TLS1_2_VERSION))
return -1;
#endif