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lighttpd1.4/src/mod_wolfssl.c

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/*
* mod_wolfssl - wolfSSL support for lighttpd
*
* Copyright(c) 2020 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_wolfssl 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>
/*
* Note: mod_wolfssl.c is forked from mod_openssl.c
* Many internal symbol names in mod_wolfssl.c retain the mod_openssl_* prefix
* (wolfSSL provides an OpenSSL compatibility layer)
*/
#include "sys-crypto.h"
#include <wolfssl/options.h>
#include <wolfssl/ssl.h>
static char global_err_buf[WOLFSSL_MAX_ERROR_SZ];
#undef ERR_error_string
#define ERR_error_string(e,b) \
(wolfSSL_ERR_error_string_n((e),global_err_buf,WOLFSSL_MAX_ERROR_SZ), \
global_err_buf)
/* WolfSSL does not provide OPENSSL_cleanse() */
#define OPENSSL_cleanse(x,sz) safe_memclear((x),(sz))
#if 0 /* symbols and definitions requires WolfSSL built with -DOPENSSL_EXTRA */
#define SSL_TLSEXT_ERR_OK 0
#define SSL_TLSEXT_ERR_ALERT_FATAL alert_fatal
#define SSL_TLSEXT_ERR_NOACK alert_warning
WOLFSSL_API void wolfSSL_set_verify_depth(WOLFSSL *ssl,int depth);
WOLFSSL_API void wolfSSL_X509_NAME_free(WOLFSSL_X509_NAME* name);
WOLFSSL_API int wolfSSL_X509_NAME_cmp(const WOLFSSL_X509_NAME* x, const WOLFSSL_X509_NAME* y);
WOLFSSL_API WOLFSSL_X509_NAME* wolfSSL_X509_NAME_dup(WOLFSSL_X509_NAME*);
WOLFSSL_API char* wolfSSL_X509_get_name_oneline(WOLFSSL_X509_NAME*, char*, int);
WOLFSSL_API const char* wolfSSL_OBJ_nid2sn(int n);
WOLFSSL_API int wolfSSL_OBJ_obj2nid(const WOLFSSL_ASN1_OBJECT *o);
WOLFSSL_API WOLFSSL_ASN1_OBJECT * wolfSSL_X509_NAME_ENTRY_get_object(WOLFSSL_X509_NAME_ENTRY *ne);
WOLFSSL_API WOLFSSL_X509_NAME_ENTRY *wolfSSL_X509_NAME_get_entry(WOLFSSL_X509_NAME *name, int loc);
#endif
#ifndef OPENSSL_ALL
/*(invalid; but centralize making these calls no-ops)*/
#define wolfSSL_sk_X509_NAME_num(a) 0
#define wolfSSL_sk_X509_NAME_push(a, b) 0
#define wolfSSL_sk_X509_NAME_pop_free(a, b) do { } while (0)
#define wolfSSL_sk_X509_NAME_free(a) do { } while (0)
#define wolfSSL_X509_get_subject_name(ca) \
((WOLFSSL_X509_NAME *)1) /* ! NULL */
#define wolfSSL_sk_X509_NAME_new(a) \
((WOLF_STACK_OF(WOLFSSL_X509_NAME) *)1) /* ! NULL */
#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 */
buffer *ssl_pemfile_pkey;
buffer *ssl_pemfile_x509;
buffer **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 {
WOLFSSL_CTX *ssl_ctx;
} plugin_ssl_ctx;
typedef struct {
STACK_OF(X509_NAME) *names;
X509_STORE *certs;
} plugin_cacerts;
typedef struct {
WOLFSSL_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 {
WOLFSSL *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 HAVE_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)*/
#define RAND_priv_bytes(x,sz) RAND_bytes((x),(sz))
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));
}
}
/* based on reference implementation from openssl 1.1.1g man page
* man SSL_CTX_set_tlsext_ticket_key_cb
* but 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)
{
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);
HMAC_Init_ex(hctx, k->tick_hmac_key, sizeof(k->tick_hmac_key),
EVP_sha256(), NULL);
return 1;
}
else { /* retrieve session */
int refresh;
tlsext_ticket_key_t *k = tlsext_ticket_key_find(key_name, &refresh);
if (NULL == k)
return 0;
HMAC_Init_ex(hctx, k->tick_hmac_key, sizeof(k->tick_hmac_key),
EVP_sha256(), NULL);
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 /* HAVE_SESSION_TICKET */
#ifdef HAVE_OCSP
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);
/* WolfSSL does not require copy */
uint8_t *ocsp_resp = (uint8_t *)ssl_stapling->ptr;
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));
return SSL_TLSEXT_ERR_NOACK; /* ignore OCSP request if error occurs */
/*return SSL_TLSEXT_ERR_ALERT_FATAL;*/
}
return SSL_TLSEXT_ERR_OK;
}
#endif
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 (wolfSSL_Init() != WOLFSSL_SUCCESS) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: wolfSSL_Init() failed");
return 0;
}
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 HAVE_SESSION_TICKET
OPENSSL_cleanse(session_ticket_keys, sizeof(session_ticket_keys));
stek_rotate_ts = 0;
#endif
if (wolfSSL_Cleanup() != WOLFSSL_SUCCESS) {
log_error(plugin_data_singleton->srv->errh, __FILE__, __LINE__,
"SSL: wolfSSL_Cleanup() failed");
}
free(local_send_buffer);
ssl_is_init = 0;
}
static void
mod_wolfssl_free_der_certs (buffer **certs)
{
if (NULL == certs) return;
for (int i = 0; NULL != certs[i]; ++i)
buffer_free(certs[i]);
free(certs);
}
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;
buffer_free(pc->ssl_pemfile_pkey);
/*buffer_free(pc->ssl_pemfile_x509);*//*(part of chain)*/
mod_wolfssl_free_der_certs(pc->ssl_pemfile_chain);
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;
wolfSSL_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)
wolfSSL_sk_X509_NAME_pop_free(cpv->v.v, X509_NAME_free);
break;
default:
break;
}
}
}
}
/* WolfSSL OpenSSL compat API does not wipe temp mem used; write our own */
/* (pemfile might contain private key)*/
/* code here is based on similar code in mod_nss */
#include "base64.h"
#define PEM_BEGIN "-----BEGIN "
#define PEM_END "-----END "
#define PEM_BEGIN_CERT "-----BEGIN CERTIFICATE-----"
#define PEM_END_CERT "-----END CERTIFICATE-----"
#define PEM_BEGIN_TRUSTED_CERT "-----BEGIN TRUSTED CERTIFICATE-----"
#define PEM_END_TRUSTED_CERT "-----END TRUSTED CERTIFICATE-----"
#define PEM_BEGIN_PKEY "-----BEGIN PRIVATE KEY-----"
#define PEM_END_PKEY "-----END PRIVATE KEY-----"
#define PEM_BEGIN_EC_PKEY "-----BEGIN EC PRIVATE KEY-----"
#define PEM_END_EC_PKEY "-----END EC PRIVATE KEY-----"
#define PEM_BEGIN_RSA_PKEY "-----BEGIN RSA PRIVATE KEY-----"
#define PEM_END_RSA_PKEY "-----END RSA PRIVATE KEY-----"
#define PEM_BEGIN_DSA_PKEY "-----BEGIN DSA PRIVATE KEY-----"
#define PEM_END_DSA_PKEY "-----END DSA PRIVATE KEY-----"
#define PEM_BEGIN_ANY_PKEY "-----BEGIN ANY PRIVATE KEY-----"
#define PEM_END_ANY_PKEY "-----END ANY PRIVATE KEY-----"
/* (not implemented: support to get password from user for encrypted key) */
#define PEM_BEGIN_ENCRYPTED_PKEY "-----BEGIN ENCRYPTED PRIVATE KEY-----"
#define PEM_END_ENCRYPTED_PKEY "-----END ENCRYPTED PRIVATE KEY-----"
#define PEM_BEGIN_X509_CRL "-----BEGIN X509 CRL-----"
#define PEM_END_X509_CRL "-----END X509 CRL-----"
static buffer *
mod_wolfssl_load_pem_file (const char *fn, log_error_st *errh, buffer ***chain)
{
off_t dlen = 512*1024*1024;/*(arbitrary limit: 512 MB file; expect < 1 MB)*/
char *data = fdevent_load_file(fn, &dlen, errh, malloc, free);
if (NULL == data) return NULL;
buffer **certs = NULL;
int rc = -1;
do {
int count = 0;
char *b = data;
for (; (b = strstr(b, PEM_BEGIN_CERT)); b += sizeof(PEM_BEGIN_CERT)-1)
++count;
b = data;
for (; (b = strstr(b, PEM_BEGIN_TRUSTED_CERT));
b += sizeof(PEM_BEGIN_TRUSTED_CERT)-1)
++count;
if (0 == count) {
rc = 0;
break;
}
certs = malloc((count+1) * sizeof(buffer *));
force_assert(NULL != certs);
certs[count] = NULL;
for (int i = 0; i < count; ++i)
certs[i] = buffer_init();
buffer *der;
int i = 0;
for (char *e = data; (b = strstr(e, PEM_BEGIN_CERT)); ++i) {
b += sizeof(PEM_BEGIN_CERT)-1;
if (*b == '\r') ++b;
if (*b == '\n') ++b;
e = strstr(b, PEM_END_CERT);
if (NULL == e) break;
uint32_t len = (uint32_t)(e - b);
e += sizeof(PEM_END_CERT)-1;
if (i >= count) break; /*(should not happen)*/
der = certs[i];
if (NULL == buffer_append_base64_decode(der,b,len,BASE64_STANDARD))
break;
}
for (char *e = data; (b = strstr(e, PEM_BEGIN_TRUSTED_CERT)); ++i) {
b += sizeof(PEM_BEGIN_TRUSTED_CERT)-1;
if (*b == '\r') ++b;
if (*b == '\n') ++b;
e = strstr(b, PEM_END_TRUSTED_CERT);
if (NULL == e) break;
uint32_t len = (uint32_t)(e - b);
e += sizeof(PEM_END_TRUSTED_CERT)-1;
if (i >= count) break; /*(should not happen)*/
der = certs[i];
if (NULL == buffer_append_base64_decode(der,b,len,BASE64_STANDARD))
break;
}
if (i == count)
rc = 0;
else
errno = EIO;
} while (0);
if (dlen) safe_memclear(data, dlen);
free(data);
if (rc < 0) {
log_perror(errh, __FILE__, __LINE__, "error loading %s", fn);
mod_wolfssl_free_der_certs(certs);
certs = NULL;
}
*chain = certs;
return certs ? certs[0] : NULL;
}
static buffer *
mod_wolfssl_evp_pkey_load_pem_file (const char *fn, log_error_st *errh)
{
off_t dlen = 512*1024*1024;/*(arbitrary limit: 512 MB file; expect < 1 MB)*/
char *data = fdevent_load_file(fn, &dlen, errh, malloc, free);
if (NULL == data) return NULL;
buffer *pkey = NULL;
int rc = -1;
do {
/*(expecting single private key in file, so first match)*/
char *b, *e;
if ((b = strstr(data, PEM_BEGIN_PKEY))
&& (e = strstr(b, PEM_END_PKEY)))
b += sizeof(PEM_BEGIN_PKEY)-1;
else if ((b = strstr(data, PEM_BEGIN_EC_PKEY))
&& (e = strstr(b, PEM_END_EC_PKEY)))
b += sizeof(PEM_BEGIN_EC_PKEY)-1;
else if ((b = strstr(data, PEM_BEGIN_RSA_PKEY))
&& (e = strstr(b, PEM_END_RSA_PKEY)))
b += sizeof(PEM_BEGIN_RSA_PKEY)-1;
else if ((b = strstr(data, PEM_BEGIN_DSA_PKEY))
&& (e = strstr(b, PEM_END_DSA_PKEY)))
b += sizeof(PEM_BEGIN_DSA_PKEY)-1;
else if ((b = strstr(data, PEM_BEGIN_ANY_PKEY))
&& (e = strstr(b, PEM_END_ANY_PKEY)))
b += sizeof(PEM_BEGIN_ANY_PKEY)-1;
else
break;
if (*b == '\r') ++b;
if (*b == '\n') ++b;
pkey = buffer_init();
size_t len = (size_t)(e - b);
if (NULL == buffer_append_base64_decode(pkey, b, len, BASE64_STANDARD))
break;
rc = 0;
} while (0);
if (dlen) safe_memclear(data, dlen);
free(data);
if (rc < 0) {
log_error(errh, __FILE__, __LINE__, "%s() %s", __func__, fn);
return NULL;
}
return pkey;
}
static int
mod_wolfssl_CTX_use_certificate_chain_file (WOLFSSL_CTX *ssl_ctx, const char *fn, log_error_st *errh)
{
/* (While it should be possible to parse DERs from (buffer **)
* s->pc->ssl_pemfile_chain, it is simpler to re-read file and use the
* built-in wolfSSL_CTX_use_certificate_chain_buffer() interface) */
off_t dlen = 4*1024*1024;/*(arbitrary limit: 4 MB file; expect < 1 KB)*/
char *data = fdevent_load_file(fn, &dlen, errh, malloc, free);
if (NULL == data) return -1;
int rc = wolfSSL_CTX_use_certificate_chain_buffer(ssl_ctx,
(unsigned char *)data,
(long)dlen);
if (dlen) safe_memclear(data, dlen);
free(data);
if (rc == WOLFSSL_SUCCESS)
return 1;
log_error(errh, __FILE__, __LINE__,
"SSL: %s %s", ERR_error_string(rc, NULL), fn);
return 0;
}
static STACK_OF(X509_NAME) *
mod_wolfssl_load_client_CA_file (const buffer *ssl_ca_file, log_error_st *errh)
{
/* similar to wolfSSL_load_client_CA_file(), plus some processing */
buffer **certs = NULL;
if (NULL == mod_wolfssl_load_pem_file(ssl_ca_file->ptr, errh, &certs)) {
#ifdef __clang_analyzer__
mod_wolfssl_free_der_certs(certs); /*unnecessary; quiet clang analyzer*/
#endif
return NULL;
}
WOLF_STACK_OF(WOLFSSL_X509_NAME) *canames = wolfSSL_sk_X509_NAME_new(NULL);
if (NULL == canames) {
mod_wolfssl_free_der_certs(certs);
return NULL;
}
for (int i = 0; NULL != certs[i]; ++i) {
WOLFSSL_X509 *ca =
wolfSSL_X509_load_certificate_buffer((unsigned char *)certs[i]->ptr,
(int)
buffer_string_length(certs[i]),
WOLFSSL_FILETYPE_ASN1);
WOLFSSL_X509_NAME *subj = NULL;
if (NULL == ca
|| NULL == (subj = wolfSSL_X509_get_subject_name(ca))
|| 0 != wolfSSL_sk_X509_NAME_push(canames,
wolfSSL_X509_NAME_dup(subj))) {
log_error(errh, __FILE__, __LINE__,
"SSL: couldn't read X509 certificates from '%s'",
ssl_ca_file->ptr);
if (subj) wolfSSL_X509_NAME_free(subj);
if (ca) wolfSSL_X509_free(ca);
wolfSSL_sk_X509_NAME_free(canames);
mod_wolfssl_free_der_certs(certs);
return NULL;
}
wolfSSL_X509_free(ca);
}
mod_wolfssl_free_der_certs(certs);
return canames;
}
static plugin_cacerts *
mod_wolfssl_load_cacerts (const buffer *ssl_ca_file, log_error_st *errh)
{
/* similar to mod_wolfSSL_load_client_CA_file(), plus some processing */
/* similar to wolfSSL_load_client_CA_file(), plus some processing */
buffer **certs = NULL;
if (NULL == mod_wolfssl_load_pem_file(ssl_ca_file->ptr, errh, &certs)) {
#ifdef __clang_analyzer__
mod_wolfssl_free_der_certs(certs); /*unnecessary; quiet clang analyzer*/
#endif
return NULL;
}
WOLFSSL_X509_STORE *castore = wolfSSL_X509_STORE_new();
if (NULL == castore) {
mod_wolfssl_free_der_certs(certs);
return NULL;
}
WOLF_STACK_OF(WOLFSSL_X509_NAME) *canames = wolfSSL_sk_X509_NAME_new(NULL);
if (NULL == canames) {
wolfSSL_X509_STORE_free(castore);
mod_wolfssl_free_der_certs(certs);
return NULL;
}
for (int i = 0; NULL != certs[i]; ++i) {
WOLFSSL_X509 *ca =
wolfSSL_X509_load_certificate_buffer((unsigned char *)certs[i]->ptr,
(int)
buffer_string_length(certs[i]),
WOLFSSL_FILETYPE_ASN1);
WOLFSSL_X509_NAME *subj = NULL;
if (NULL == ca || !wolfSSL_X509_STORE_add_cert(castore, ca)
|| NULL == (subj = wolfSSL_X509_get_subject_name(ca))
|| 0 != wolfSSL_sk_X509_NAME_push(canames,
wolfSSL_X509_NAME_dup(subj))) {
log_error(errh, __FILE__, __LINE__,
"SSL: couldn't read X509 certificates from '%s'",
ssl_ca_file->ptr);
if (subj) wolfSSL_X509_NAME_free(subj);
if (ca) wolfSSL_X509_free(ca);
wolfSSL_sk_X509_NAME_free(canames);
wolfSSL_X509_STORE_free(castore);
mod_wolfssl_free_der_certs(certs);
return NULL;
}
wolfSSL_X509_free(ca);
}
mod_wolfssl_free_der_certs(certs);
plugin_cacerts *cacerts = malloc(sizeof(plugin_cacerts));
force_assert(cacerts);
cacerts->names = canames;
cacerts->certs = castore;
return cacerts;
}
static int
mod_wolfssl_load_cacrls (WOLFSSL_CTX *ssl_ctx, const buffer *ssl_ca_crl_file, server *srv)
{
#ifdef HAVE_CRL /* <wolfssl/options.h> */
int rc = wolfSSL_CTX_EnableCRL(ssl_ctx,
WOLFSSL_CRL_CHECK | WOLFSSL_CRL_CHECKALL);
if (rc != WOLFSSL_SUCCESS) return 0;
const char *fn = ssl_ca_crl_file->ptr;
off_t dlen = 512*1024*1024;/*(arbitrary limit: 512 MB file; expect < 1 MB)*/
char *data = fdevent_load_file(fn, &dlen, srv->errh, malloc, free);
if (NULL == data) return 0;
rc = wolfSSL_CTX_LoadCRLBuffer(ssl_ctx, (byte *)data, (long)dlen,
WOLFSSL_FILETYPE_PEM);
if (dlen) safe_memclear(data, dlen);
free(data);
if (rc == WOLFSSL_SUCCESS)
return 1;
log_error(srv->errh, __FILE__, __LINE__,
"SSL: %s %s", ERR_error_string(rc, NULL), fn);
return 0;
#else
UNUSED(ssl_ctx);
log_error(srv->errh, __FILE__, __LINE__,
"WolfSSL not built with CRL support; ignoring %s", ssl_ca_crl_file->ptr);
return WOLFSSL_FAILURE;
#endif
}
static int
mod_wolfssl_load_verify_locn (SSL_CTX *ssl_ctx, const buffer *b, server *srv)
{
const char *fn = b->ptr;
off_t dlen = 512*1024*1024;/*(arbitrary limit: 512 MB file; expect < 1 MB)*/
char *data = fdevent_load_file(fn, &dlen, srv->errh, malloc, free);
if (NULL == data) return 0;
int rc = wolfSSL_CTX_load_verify_buffer(ssl_ctx, (unsigned char *)data,
(long)dlen, WOLFSSL_FILETYPE_PEM);
if (dlen) safe_memclear(data, dlen);
free(data);
if (rc == WOLFSSL_SUCCESS)
return 1;
log_error(srv->errh, __FILE__, __LINE__,
"SSL: %s %s", ERR_error_string(rc, NULL), fn);
return 0;
}
static int
mod_wolfssl_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_wolfssl_load_verify_locn(ssl_ctx, b, srv))
return 0;
}
return 1;
}
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)
{
if (wolfSSL_X509_get_name_oneline(name, buf, (int)sz))
return (int)strlen(buf);
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 */
SSL *ssl_nonconst;
*(const SSL **)&ssl_nonconst = ssl;
if (wolfSSL_GetVersion(ssl_nonconst) >= WOLFSSL_TLSV1_3) {
/* 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
* wolfSSL_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;
err_cert = ctx->current_cert;/*wolfSSL_X509_STORE_CTX_get_current_cert*/
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=wolfSSL_sk_X509_NAME_num(cert_names); i < len; ++i) {
if (0 == wolfSSL_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;
}
err_cert = ctx->current_cert; /*wolfSSL_X509_STORE_CTX_get_current_cert()*/
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 */
buffer *cert = pc->ssl_pemfile_x509;
if (1 != wolfSSL_use_certificate_ASN1(ssl, (unsigned char *)cert->ptr,
(int)buffer_string_length(cert))) {
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;
}
buffer *pkey = pc->ssl_pemfile_pkey;
if (1 != wolfSSL_use_PrivateKey_buffer(ssl, (unsigned char *)pkey->ptr,
(int)buffer_string_length(pkey),
WOLFSSL_FILETYPE_ASN1)) {
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;
}
/* WolfSSL does not support setting per-session CA list;
* limitation is to per-CTX CA list, and is not changed after SNI */
int mode = SSL_VERIFY_PEER;
if (hctx->conf.ssl_verifyclient_enforce)
mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
wolfSSL_set_verify(ssl, mode, verify_callback);
wolfSSL_set_verify_depth(ssl, hctx->conf.ssl_verifyclient_depth + 1);
}
else {
wolfSSL_set_verify(ssl, SSL_VERIFY_NONE, NULL);
}
return 1;
}
#ifdef HAVE_TLS_EXTENSIONS
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);*/
return (mod_openssl_cert_cb(hctx->ssl, NULL) == 1)
? SSL_TLSEXT_ERR_OK
: SSL_TLSEXT_ERR_ALERT_FATAL;
}
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;
size_t len = (size_t)
#ifdef HAVE_SNI
wolfSSL_SNI_GetRequest(ssl, WOLFSSL_SNI_HOST_NAME, (void **)&servername);
#else
0;
#endif
if (0 == len)
return SSL_TLSEXT_ERR_NOACK; /* client did not provide SNI */
#if 0 /* WolfSSL does not provide per-session SSL_set_read_ahead() */
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;
#else
return mod_openssl_SNI(hctx, servername, len);
#endif
}
#endif
#ifdef HAVE_OCSP
#define OCSP_RESPONSE OcspResponse
#define OCSP_RESPONSE_free wolfSSL_OCSP_RESPONSE_free
#define d2i_OCSP_RESPONSE_bio wolfSSL_d2i_OCSP_RESPONSE_bio
#define d2i_OCSP_RESPONSE wolfSSL_d2i_OCSP_RESPONSE
#define i2d_OCSP_RESPONSE wolfSSL_i2d_OCSP_RESPONSE
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 (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;
}
static time_t
mod_openssl_asn1_time_to_posix (ASN1_TIME *asn1time)
{
/* Note: this does not check for integer overflow of time_t! */
int day, sec;
return wolfSSL_ASN1_TIME_diff(&day, &sec, NULL, asn1time)
? log_epoch_secs + day*86400 + sec
: (time_t)-1;
}
static time_t
mod_openssl_ocsp_next_update (plugin_cert *pc)
{
#if defined(WOLFSSL_VERSION)
/* XXX: future TODO */
UNUSED(pc);
(void)mod_openssl_asn1_time_to_posix(NULL);
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;
#ifdef WOLFSSL_VERSION /* WolfSSL limitation */
/* WolfSSL does not provide OCSP_resp_get0() OCSP_single_get0_status() */
/* (inactive code path; alternative path followed in #if above for WolfSSL)
* (chain not currently available in mod_openssl when used with WolfSSL)
* (For WolfSSL, pc->ssl_pemfile_chain might not be filled in with actual
* chain, but is used to store (buffer **) of DER decoded from PEM certs
* read from ssl.pemfile, which may be a single cert, pc->ssl_pemfile_x509.
* The chain is not calculated or filled in if single cert, and neither are
* (X509 *), though (X509 *) could be temporarily created to calculated
* (OCSP_CERTID *), which additionally could be calculated once at startup)
*/
OCSP_CERTID *id = (NULL != pc->ssl_pemfile_chain)
? OCSP_cert_to_id(NULL, pc->ssl_pemfile_x509,
sk_X509_value(pc->ssl_pemfile_chain, 0))
: NULL;
if (id == NULL) {
OCSP_BASICRESP_free(bs);
OCSP_RESPONSE_free(ocsp);
return (time_t)-1;
}
OCSP_resp_find_status(bs, id, NULL, NULL, NULL, NULL, &nextupd);
OCSP_CERTID_free(id);
#else
OCSP_single_get0_status(OCSP_resp_get0(bs, 0), NULL, NULL, NULL, &nextupd);
#endif
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)
{
/* XXX: TODO: not implemented */
UNUSED(crt);
return 0;
}
#endif /* HAVE_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;
buffer **ssl_pemfile_chain = NULL;
buffer *ssl_pemfile_x509 =
mod_wolfssl_load_pem_file(pemfile->ptr, srv->errh, &ssl_pemfile_chain);
if (NULL == ssl_pemfile_x509)
return NULL;
buffer *ssl_pemfile_pkey =
mod_wolfssl_evp_pkey_load_pem_file(privkey->ptr, srv->errh);
if (NULL == ssl_pemfile_pkey) {
/*buffer_free(ssl_pemfile_x509);*//*(part of chain)*/
mod_wolfssl_free_der_certs(ssl_pemfile_chain);
return NULL;
}
/* X509_check_private_key() is a stub func (not implemented) in WolfSSL */
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;
#ifdef HAVE_OCSP
/*(not implemented for WolfSSL, though could convert the DER to (X509 *),
* check Must-Staple, and then destroy (X509 *))*/
(void)mod_openssl_crt_must_staple(NULL);
pc->must_staple = 0;
#else
pc->must_staple = 0;
#endif
if (!buffer_string_is_empty(pc->ssl_stapling_file)) {
#ifdef HAVE_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;
}
#ifdef HAVE_TLS_EXTENSIONS
#ifdef HAVE_ALPN
#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;
buffer *ssl_pemfile_x509 = NULL;
buffer *ssl_pemfile_pkey = NULL;
buffer **ssl_pemfile_chain = 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_wolfssl_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_wolfssl_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 */
buffer *cert = ssl_pemfile_x509;
if (1 != wolfSSL_use_certificate_ASN1(ssl, (unsigned char *)cert->ptr,
(int)buffer_string_length(cert))){
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) {
/* WolfSSL limitation */
/* WolfSSL does not support setting per-session chain;
* limitation is to per-CTX chain, and so chain is not provided for
* "acme-tls/1" (might be non-issue; chain might not be present) */
}
buffer *pkey = ssl_pemfile_pkey;
if (1 != wolfSSL_use_PrivateKey_buffer(ssl, (unsigned char *)pkey->ptr,
(int)buffer_string_length(pkey),
WOLFSSL_FILETYPE_ASN1)) {
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;
wolfSSL_set_verify(ssl, SSL_VERIFY_NONE, NULL);
rc = SSL_TLSEXT_ERR_OK;
} while (0);
if (ssl_pemfile_pkey) buffer_free(ssl_pemfile_pkey);
/*if (ssl_pemfile_x509) buffer_free(ssl_pemfile_x509);*//*(part of chain)*/
mod_wolfssl_free_der_certs(ssl_pemfile_chain);
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;
}
return SSL_TLSEXT_ERR_NOACK;
}
#endif /* TLSEXT_TYPE_application_layer_protocol_negotiation */
#endif /* HAVE_ALPN */
#endif /* HAVE_TLS_EXTENSIONS */
static int
mod_openssl_ssl_conf_cmd (server *srv, plugin_config_socket *s);
#ifndef NO_DH
/* wolfSSL provides wolfSSL_DH_set0_pqg() for
* Apache w/ OPENSSL_VERSION_NUMBER >= 0x10100000L
* but does not provide most other openssl 1.1.0+ interfaces
* and get_dh2048() might not be necessary if wolfSSL defines
* HAVE_TLS_EXTENSIONS HAVE_DH_DEFAULT_PARAMS HAVE_FFDHE HAVE_SUPPORTED_CURVES*/
#define DH_set0_pqg(dh, dh_p, NULL, dh_g) \
((dh)->p = (dh_p), (dh)->g = (dh_g), (dh_p) != NULL && (dh_g) != NULL)
/* 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)
{
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 = wolfSSL_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 {
/* Default curve */
nid = wolfSSL_OBJ_sn2nid("prime256v1");
}
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;
}
wolfSSL_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);
}
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
long ssloptions = SSL_OP_ALL
| SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
| SSL_OP_NO_COMPRESSION;
s->ssl_ctx = (!s->ssl_use_sslv2 && !s->ssl_use_sslv3)
? SSL_CTX_new(TLS_server_method())
: SSL_CTX_new(SSLv23_server_method());
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 !defined(NO_SESSION_CACHE)
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);
#endif
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);
/*(wolfSSL does not support SSLv2)*/
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 NO_DH
{
DH *dh;
/* Support for Diffie-Hellman key exchange */
if (!buffer_string_is_empty(s->ssl_dh_file)) {
const char *fn = s->ssl_dh_file->ptr;
off_t dlen = 1*1024*1024;/*(arbitrary limit: 1 MB; expect < 1 KB)*/
char *data = fdevent_load_file(fn, &dlen, srv->errh, malloc, free);
int rc = (NULL != data) ? 0 : -1;
if (0 == rc)
wolfSSL_CTX_SetTmpDH_buffer(s->ssl_ctx, (unsigned char *)data,
(long)dlen, WOLFSSL_FILETYPE_PEM);
if (dlen) safe_memclear(data, dlen);
free(data);
if (rc < 0) {
log_error(srv->errh, __FILE__, __LINE__,
"SSL: Unable to read DH params from file %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);
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 HAVE_SESSION_TICKET
wolfSSL_CTX_set_tlsext_ticket_key_cb(s->ssl_ctx, ssl_tlsext_ticket_key_cb);
#endif
#ifdef HAVE_OCSP
wolfSSL_CTX_set_tlsext_status_cb(s->ssl_ctx, ssl_tlsext_status_cb);
#endif
/* 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_wolfssl_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;
}
#ifndef OPENSSL_ALL
log_error(srv->errh, __FILE__, __LINE__,
"SSL: You specified ssl.verifyclient.activate "
"but wolfssl library built without necessary support");
return -1;
#else
/* 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)
* https://github.com/wolfSSL/wolfssl/pull/3098 */
STACK_OF(X509_NAME) * const cert_names = s->ssl_ca_dn_file
? s->ssl_ca_dn_file
: s->ssl_ca_file->names;
wolfSSL_CTX_set_client_CA_list(s->ssl_ctx,
wolfSSL_dup_CA_list(cert_names));
int mode = SSL_VERIFY_PEER;
if (s->ssl_verifyclient_enforce) {
mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
}
wolfSSL_CTX_set_verify(s->ssl_ctx, mode, verify_callback);
wolfSSL_CTX_set_verify_depth(s->ssl_ctx,
s->ssl_verifyclient_depth + 1);
#endif
if (!buffer_string_is_empty(s->ssl_ca_crl_file)) {
if (!mod_wolfssl_load_cacrls(s->ssl_ctx,s->ssl_ca_crl_file,srv))
return -1;
}
}
if (1 != mod_wolfssl_CTX_use_certificate_chain_file(
s->ssl_ctx, s->pc->ssl_pemfile->ptr, srv->errh))
return -1;
buffer *k = s->pc->ssl_pemfile_pkey;
if (1 != wolfSSL_CTX_use_PrivateKey_buffer(s->ssl_ctx,
(unsigned char *)k->ptr,
(int)buffer_string_length(k),
WOLFSSL_FILETYPE_ASN1)) {
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;
}
SSL_CTX_set_default_read_ahead(s->ssl_ctx, s->ssl_read_ahead);
wolfSSL_CTX_set_mode(s->ssl_ctx,
SSL_MODE_ENABLE_PARTIAL_WRITE);
wolfSSL_CTX_set_mode(s->ssl_ctx, /*(wolfSSL default mode)*/
WOLFSSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
#ifdef wolfSSL_SSL_MODE_RELEASE_BUFFERS
wolfSSL_CTX_set_mode(s->ssl_ctx, /*(not currently implemented)*/
wolfSSL_SSL_MODE_RELEASE_BUFFERS);
#endif
#ifdef HAVE_TLS_EXTENSIONS
/*(wolfSSL preprocessor defines are obnoxious)*/
/*(code should be HAVE_SNI, but is hidden by OPENSSL_ALL
* even though the comment in wolfssl code on the #endif
* says (OPENSSL_ALL
* || (OPENSSL_EXTRA
* && (HAVE_STUNNEL || WOLFSSL_NGINX || HAVE_LIGHTY)))
* and sniRecvCb sniRecvCbArg are hidden by *different* set of defines
* in wolfssl/internal.h)
* Note: SNI callbacks disabled if wolfSSL is not built OPENSSL_ALL ! */
#ifdef OPENSSL_ALL /* regretable */
#ifdef HAVE_SNI
wolfSSL_CTX_set_servername_callback(
s->ssl_ctx, network_ssl_servername_callback);
wolfSSL_CTX_set_servername_arg(s->ssl_ctx, srv);
#endif /* regretable */
#else
log_error(srv->errh, __FILE__, __LINE__,
"SSL: WARNING: SNI callbacks *crippled* in wolfSSL library build");
UNUSED(network_ssl_servername_callback);
#endif
#ifdef HAVE_ALPN
#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
SSL_CTX_set_alpn_select_cb(s->ssl_ctx,mod_openssl_alpn_select_cb,NULL);
#endif
#endif
#endif
if (!s->ssl_use_sslv3 && !s->ssl_use_sslv2
&& wolfSSL_CTX_SetMinVersion(s->ssl_ctx, WOLFSSL_TLSV1_2)
!= WOLFSSL_SUCCESS)
return -1;
if (s->ssl_conf_cmd && s->ssl_conf_cmd->used) {
if (0 != mod_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 }
,{ CONST_STR_LEN("ssl.stek-file"),
T_CONFIG_STRING,
T_CONFIG_SCOPE_SERVER }
,{ NULL, 0,
T_CONFIG_UNSET,
T_CONFIG_SCOPE_UNSET }
};
/* WolfSSL does not have mapping for "HIGH" */
/* cipher list is (current) output of "openssl ciphers HIGH" */
static const buffer default_ssl_cipher_list = { CONST_STR_LEN("TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256:TLS_AES_128_GCM_SHA256:TLS_AES_128_CCM_SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-DSS-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES256-CCM8:ECDHE-ECDSA-AES256-CCM:DHE-RSA-AES256-CCM8:DHE-RSA-AES256-CCM:ECDHE-ECDSA-ARIA256-GCM-SHA384:ECDHE-ARIA256-GCM-SHA384:DHE-DSS-ARIA256-GCM-SHA384:DHE-RSA-ARIA256-GCM-SHA384:ADH-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:DHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-CCM8:ECDHE-ECDSA-AES128-CCM:DHE-RSA-AES128-CCM8:DHE-RSA-AES128-CCM:ECDHE-ECDSA-ARIA128-GCM-SHA256:ECDHE-ARIA128-GCM-SHA256:DHE-DSS-ARIA128-GCM-SHA256:DHE-RSA-ARIA128-GCM-SHA256:ADH-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA256:ECDHE-ECDSA-CAMELLIA256-SHA384:ECDHE-RSA-CAMELLIA256-SHA384:DHE-RSA-CAMELLIA256-SHA256:DHE-DSS-CAMELLIA256-SHA256:ADH-AES256-SHA256:ADH-CAMELLIA256-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA256:DHE-DSS-AES128-SHA256:ECDHE-ECDSA-CAMELLIA128-SHA256:ECDHE-RSA-CAMELLIA128-SHA256:DHE-RSA-CAMELLIA128-SHA256:DHE-DSS-CAMELLIA128-SHA256:ADH-AES128-SHA256:ADH-CAMELLIA128-SHA256:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES256-SHA:DHE-DSS-AES256-SHA:DHE-RSA-CAMELLIA256-SHA:DHE-DSS-CAMELLIA256-SHA:AECDH-AES256-SHA:ADH-AES256-SHA:ADH-CAMELLIA256-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA:DHE-RSA-CAMELLIA128-SHA:DHE-DSS-CAMELLIA128-SHA:AECDH-AES128-SHA:ADH-AES128-SHA:ADH-CAMELLIA128-SHA:RSA-PSK-AES256-GCM-SHA384:DHE-PSK-AES256-GCM-SHA384:RSA-PSK-CHACHA20-POLY1305:DHE-PSK-CHACHA20-POLY1305:ECDHE-PSK-CHACHA20-POLY1305:DHE-PSK-AES256-CCM8:DHE-PSK-AES256-CCM:RSA-PSK-ARIA256-GCM-SHA384:DHE-PSK-ARIA256-GCM-SHA384:AES256-GCM-SHA384:AES256-CCM8:AES256-CCM:ARIA256-GCM-SHA384:PSK-AES256-GCM-SHA384:PSK-CHACHA20-POLY1305:PSK-AES256-CCM8:PSK-AES256-CCM:PSK-ARIA256-GCM-SHA384:RSA-PSK-AES128-GCM-SHA256:DHE-PSK-AES128-GCM-SHA256:DHE-PSK-AES128-CCM8:DHE-PSK-AES128-CCM:RSA-PSK-ARIA128-GCM-SHA256:DHE-PSK-ARIA128-GCM-SHA256:AES128-GCM-SHA256:AES128-CCM8:AES128-CCM:ARIA128-GCM-SHA256:PSK-AES128-GCM-SHA256:PSK-AES128-CCM8:PSK-AES128-CCM:PSK-ARIA128-GCM-SHA256:AES256-SHA256:CAMELLIA256-SHA256:AES128-SHA256:CAMELLIA128-SHA256:ECDHE-PSK-AES256-CBC-SHA384:ECDHE-PSK-AES256-CBC-SHA:SRP-DSS-AES-256-CBC-SHA:SRP-RSA-AES-256-CBC-SHA:SRP-AES-256-CBC-SHA:RSA-PSK-AES256-CBC-SHA384:DHE-PSK-AES256-CBC-SHA384:RSA-PSK-AES256-CBC-SHA:DHE-PSK-AES256-CBC-SHA:ECDHE-PSK-CAMELLIA256-SHA384:RSA-PSK-CAMELLIA256-SHA384:DHE-PSK-CAMELLIA256-SHA384:AES256-SHA:CAMELLIA256-SHA:PSK-AES256-CBC-SHA384:PSK-AES256-CBC-SHA:PSK-CAMELLIA256-SHA384:ECDHE-PSK-AES128-CBC-SHA256:ECDHE-PSK-AES128-CBC-SHA:SRP-DSS-AES-128-CBC-SHA:SRP-RSA-AES-128-CBC-SHA:SRP-AES-128-CBC-SHA:RSA-PSK-AES128-CBC-SHA256:DHE-PSK-AES128-CBC-SHA256:RSA-PSK-AES128-CBC-SHA:DHE-PSK-AES128-CBC-SHA:ECDHE-PSK-CAMELLIA128-SHA256:RSA-PSK-CAMELLIA128-SHA256:DHE-PSK-CAMELLIA128-SHA256:AES128-SHA:CAMELLIA128-SHA:PSK-AES128-CBC-SHA256:PSK-AES128-CBC-SHA:PSK-CAMELLIA128-SHA256"), 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. It is disabled by default.");
if (conf.ssl_empty_fragments)
log_error(srv->errh, __FILE__, __LINE__, "SSL: "
"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. "
"It is disabled by default. "
"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. "
"It is disabled by default. "
"Many modern TLS libraries no longer support SSLv3.");
if (conf.ssl_use_sslv3)
log_error(srv->errh, __FILE__, __LINE__, "SSL: "
"If needed, use: ssl.openssl.ssl-conf-cmd = "
"(\"MinProtocol\" => \"SSLv3\")");
break;
case 10:/* ssl.stek-file */
if (!buffer_is_empty(cpv->v.b))
p->ssl_stek_file = cpv->v.b->ptr;
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
|| (conf.ssl_enabled && NULL == p->ssl_ctxs[0].ssl_ctx)) {
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 HAVE_SESSION_TICKET
if (rc == HANDLER_GO_ON && ssl_is_init)
mod_openssl_session_ticket_key_check(p, 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("ssl.stapling-file"),
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_stapling_file = 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_wolfssl_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;
#ifndef OPENSSL_ALL
{
log_error(srv->errh, __FILE__, __LINE__,
"SSL: You specified ssl.ca-dn-file "
"but wolfssl library built without necessary support");
return HANDLER_ERROR;
}
#endif
cpv->v.v = mod_wolfssl_load_client_CA_file(ssl_ca_dn_file,
srv->errh);
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 */
break;
case 13:/* ssl.stapling-file */
ssl_stapling_file = cpv->v.b;
break;
case 14:/* debug.log-ssl-noise */
break;
default:/* should not happen */
break;
}
}
/* 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);
if (pemfile) {
#ifndef HAVE_TLS_EXTENSIONS
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,
ssl_stapling_file);
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);
}
/* 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)
* */
/* 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 */
static int
mod_openssl_close_notify(handler_ctx *hctx);
static int
connection_write_cq_ssl (connection *con, chunkqueue *cq, off_t max_bytes)
{
handler_ctx *hctx = con->plugin_ctx[plugin_data_singleton->id];
SSL *ssl = hctx->ssl;
log_error_st * const errh = hctx->errh;
if (0 != hctx->close_notify) return mod_openssl_close_notify(hctx);
chunkqueue_remove_finished_chunks(cq);
while (max_bytes > 0 && !chunkqueue_is_empty(cq)) {
char *data = local_send_buffer;
uint32_t data_len = LOCAL_SEND_BUFSIZE < max_bytes
? LOCAL_SEND_BUFSIZE
: (uint32_t)max_bytes;
int wr;
if (0 != chunkqueue_peek_data(cq, &data, &data_len, errh)) 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(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(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 */