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Copy pathngx_event_openssl_stapling.c
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ngx_event_openssl_stapling.c
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/*
* Copyright (C) Maxim Dounin
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_event_connect.h>
#if (!defined OPENSSL_NO_OCSP && defined SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB)
typedef struct {
ngx_str_t staple;
ngx_msec_t timeout;
ngx_resolver_t *resolver;
ngx_msec_t resolver_timeout;
ngx_addr_t *addrs;
ngx_uint_t naddrs;
ngx_str_t host;
ngx_str_t uri;
in_port_t port;
SSL_CTX *ssl_ctx;
X509 *cert;
X509 *issuer;
STACK_OF(X509) *chain;
u_char *name;
time_t valid;
time_t refresh;
unsigned verify:1;
unsigned loading:1;
} ngx_ssl_stapling_t;
typedef struct {
ngx_addr_t *addrs;
ngx_uint_t naddrs;
ngx_str_t host;
ngx_str_t uri;
in_port_t port;
ngx_uint_t depth;
ngx_shm_zone_t *shm_zone;
ngx_resolver_t *resolver;
ngx_msec_t resolver_timeout;
} ngx_ssl_ocsp_conf_t;
typedef struct {
ngx_rbtree_t rbtree;
ngx_rbtree_node_t sentinel;
ngx_queue_t expire_queue;
} ngx_ssl_ocsp_cache_t;
typedef struct {
ngx_str_node_t node;
ngx_queue_t queue;
int status;
time_t valid;
} ngx_ssl_ocsp_cache_node_t;
typedef struct ngx_ssl_ocsp_ctx_s ngx_ssl_ocsp_ctx_t;
struct ngx_ssl_ocsp_s {
STACK_OF(X509) *certs;
ngx_uint_t ncert;
int cert_status;
ngx_int_t status;
ngx_ssl_ocsp_conf_t *conf;
ngx_ssl_ocsp_ctx_t *ctx;
};
struct ngx_ssl_ocsp_ctx_s {
SSL_CTX *ssl_ctx;
X509 *cert;
X509 *issuer;
STACK_OF(X509) *chain;
int status;
time_t valid;
u_char *name;
ngx_uint_t naddrs;
ngx_uint_t naddr;
ngx_addr_t *addrs;
ngx_str_t host;
ngx_str_t uri;
in_port_t port;
ngx_resolver_t *resolver;
ngx_msec_t resolver_timeout;
ngx_msec_t timeout;
void (*handler)(ngx_ssl_ocsp_ctx_t *ctx);
void *data;
ngx_str_t key;
ngx_buf_t *request;
ngx_buf_t *response;
ngx_peer_connection_t peer;
ngx_shm_zone_t *shm_zone;
ngx_int_t (*process)(ngx_ssl_ocsp_ctx_t *ctx);
ngx_uint_t state;
ngx_uint_t code;
ngx_uint_t count;
ngx_uint_t flags;
ngx_uint_t done;
u_char *header_name_start;
u_char *header_name_end;
u_char *header_start;
u_char *header_end;
ngx_pool_t *pool;
ngx_log_t *log;
};
static ngx_int_t ngx_ssl_stapling_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl,
X509 *cert, ngx_str_t *file, ngx_str_t *responder, ngx_uint_t verify);
static ngx_int_t ngx_ssl_stapling_file(ngx_conf_t *cf, ngx_ssl_t *ssl,
ngx_ssl_stapling_t *staple, ngx_str_t *file);
static ngx_int_t ngx_ssl_stapling_issuer(ngx_conf_t *cf, ngx_ssl_t *ssl,
ngx_ssl_stapling_t *staple);
static ngx_int_t ngx_ssl_stapling_responder(ngx_conf_t *cf, ngx_ssl_t *ssl,
ngx_ssl_stapling_t *staple, ngx_str_t *responder);
static int ngx_ssl_certificate_status_callback(ngx_ssl_conn_t *ssl_conn,
void *data);
static void ngx_ssl_stapling_update(ngx_ssl_stapling_t *staple);
static void ngx_ssl_stapling_ocsp_handler(ngx_ssl_ocsp_ctx_t *ctx);
static time_t ngx_ssl_stapling_time(ASN1_GENERALIZEDTIME *asn1time);
static void ngx_ssl_stapling_cleanup(void *data);
static void ngx_ssl_ocsp_validate_next(ngx_connection_t *c);
static void ngx_ssl_ocsp_handler(ngx_ssl_ocsp_ctx_t *ctx);
static ngx_int_t ngx_ssl_ocsp_responder(ngx_connection_t *c,
ngx_ssl_ocsp_ctx_t *ctx);
static ngx_ssl_ocsp_ctx_t *ngx_ssl_ocsp_start(ngx_log_t *log);
static void ngx_ssl_ocsp_done(ngx_ssl_ocsp_ctx_t *ctx);
static void ngx_ssl_ocsp_next(ngx_ssl_ocsp_ctx_t *ctx);
static void ngx_ssl_ocsp_request(ngx_ssl_ocsp_ctx_t *ctx);
static void ngx_ssl_ocsp_resolve_handler(ngx_resolver_ctx_t *resolve);
static void ngx_ssl_ocsp_connect(ngx_ssl_ocsp_ctx_t *ctx);
static void ngx_ssl_ocsp_write_handler(ngx_event_t *wev);
static void ngx_ssl_ocsp_read_handler(ngx_event_t *rev);
static void ngx_ssl_ocsp_dummy_handler(ngx_event_t *ev);
static ngx_int_t ngx_ssl_ocsp_create_request(ngx_ssl_ocsp_ctx_t *ctx);
static ngx_int_t ngx_ssl_ocsp_process_status_line(ngx_ssl_ocsp_ctx_t *ctx);
static ngx_int_t ngx_ssl_ocsp_parse_status_line(ngx_ssl_ocsp_ctx_t *ctx);
static ngx_int_t ngx_ssl_ocsp_process_headers(ngx_ssl_ocsp_ctx_t *ctx);
static ngx_int_t ngx_ssl_ocsp_parse_header_line(ngx_ssl_ocsp_ctx_t *ctx);
static ngx_int_t ngx_ssl_ocsp_process_body(ngx_ssl_ocsp_ctx_t *ctx);
static ngx_int_t ngx_ssl_ocsp_verify(ngx_ssl_ocsp_ctx_t *ctx);
static ngx_int_t ngx_ssl_ocsp_cache_lookup(ngx_ssl_ocsp_ctx_t *ctx);
static ngx_int_t ngx_ssl_ocsp_cache_store(ngx_ssl_ocsp_ctx_t *ctx);
static ngx_int_t ngx_ssl_ocsp_create_key(ngx_ssl_ocsp_ctx_t *ctx);
static u_char *ngx_ssl_ocsp_log_error(ngx_log_t *log, u_char *buf, size_t len);
ngx_int_t
ngx_ssl_stapling(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *file,
ngx_str_t *responder, ngx_uint_t verify)
{
X509 *cert;
for (cert = SSL_CTX_get_ex_data(ssl->ctx, ngx_ssl_certificate_index);
cert;
cert = X509_get_ex_data(cert, ngx_ssl_next_certificate_index))
{
if (ngx_ssl_stapling_certificate(cf, ssl, cert, file, responder, verify)
!= NGX_OK)
{
return NGX_ERROR;
}
}
SSL_CTX_set_tlsext_status_cb(ssl->ctx, ngx_ssl_certificate_status_callback);
return NGX_OK;
}
static ngx_int_t
ngx_ssl_stapling_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl, X509 *cert,
ngx_str_t *file, ngx_str_t *responder, ngx_uint_t verify)
{
ngx_int_t rc;
ngx_pool_cleanup_t *cln;
ngx_ssl_stapling_t *staple;
staple = ngx_pcalloc(cf->pool, sizeof(ngx_ssl_stapling_t));
if (staple == NULL) {
return NGX_ERROR;
}
cln = ngx_pool_cleanup_add(cf->pool, 0);
if (cln == NULL) {
return NGX_ERROR;
}
cln->handler = ngx_ssl_stapling_cleanup;
cln->data = staple;
if (X509_set_ex_data(cert, ngx_ssl_stapling_index, staple) == 0) {
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0, "X509_set_ex_data() failed");
return NGX_ERROR;
}
#ifdef SSL_CTRL_SELECT_CURRENT_CERT
/* OpenSSL 1.0.2+ */
SSL_CTX_select_current_cert(ssl->ctx, cert);
#endif
#ifdef SSL_CTRL_GET_EXTRA_CHAIN_CERTS
/* OpenSSL 1.0.1+ */
SSL_CTX_get_extra_chain_certs(ssl->ctx, &staple->chain);
#else
staple->chain = ssl->ctx->extra_certs;
#endif
staple->ssl_ctx = ssl->ctx;
staple->timeout = 60000;
staple->verify = verify;
staple->cert = cert;
staple->name = X509_get_ex_data(staple->cert,
ngx_ssl_certificate_name_index);
if (file->len) {
/* use OCSP response from the file */
if (ngx_ssl_stapling_file(cf, ssl, staple, file) != NGX_OK) {
return NGX_ERROR;
}
return NGX_OK;
}
rc = ngx_ssl_stapling_issuer(cf, ssl, staple);
if (rc == NGX_DECLINED) {
return NGX_OK;
}
if (rc != NGX_OK) {
return NGX_ERROR;
}
rc = ngx_ssl_stapling_responder(cf, ssl, staple, responder);
if (rc == NGX_DECLINED) {
return NGX_OK;
}
if (rc != NGX_OK) {
return NGX_ERROR;
}
return NGX_OK;
}
static ngx_int_t
ngx_ssl_stapling_file(ngx_conf_t *cf, ngx_ssl_t *ssl,
ngx_ssl_stapling_t *staple, ngx_str_t *file)
{
BIO *bio;
int len;
u_char *p, *buf;
OCSP_RESPONSE *response;
if (ngx_conf_full_name(cf->cycle, file, 1) != NGX_OK) {
return NGX_ERROR;
}
bio = BIO_new_file((char *) file->data, "rb");
if (bio == NULL) {
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
"BIO_new_file(\"%s\") failed", file->data);
return NGX_ERROR;
}
response = d2i_OCSP_RESPONSE_bio(bio, NULL);
if (response == NULL) {
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
"d2i_OCSP_RESPONSE_bio(\"%s\") failed", file->data);
BIO_free(bio);
return NGX_ERROR;
}
len = i2d_OCSP_RESPONSE(response, NULL);
if (len <= 0) {
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
"i2d_OCSP_RESPONSE(\"%s\") failed", file->data);
goto failed;
}
buf = ngx_alloc(len, ssl->log);
if (buf == NULL) {
goto failed;
}
p = buf;
len = i2d_OCSP_RESPONSE(response, &p);
if (len <= 0) {
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
"i2d_OCSP_RESPONSE(\"%s\") failed", file->data);
ngx_free(buf);
goto failed;
}
OCSP_RESPONSE_free(response);
BIO_free(bio);
staple->staple.data = buf;
staple->staple.len = len;
staple->valid = NGX_MAX_TIME_T_VALUE;
return NGX_OK;
failed:
OCSP_RESPONSE_free(response);
BIO_free(bio);
return NGX_ERROR;
}
static ngx_int_t
ngx_ssl_stapling_issuer(ngx_conf_t *cf, ngx_ssl_t *ssl,
ngx_ssl_stapling_t *staple)
{
int i, n, rc;
X509 *cert, *issuer;
X509_STORE *store;
X509_STORE_CTX *store_ctx;
cert = staple->cert;
n = sk_X509_num(staple->chain);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ssl->log, 0,
"SSL get issuer: %d extra certs", n);
for (i = 0; i < n; i++) {
issuer = sk_X509_value(staple->chain, i);
if (X509_check_issued(issuer, cert) == X509_V_OK) {
#if OPENSSL_VERSION_NUMBER >= 0x10100001L
X509_up_ref(issuer);
#else
CRYPTO_add(&issuer->references, 1, CRYPTO_LOCK_X509);
#endif
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ssl->log, 0,
"SSL get issuer: found %p in extra certs", issuer);
staple->issuer = issuer;
return NGX_OK;
}
}
store = SSL_CTX_get_cert_store(ssl->ctx);
if (store == NULL) {
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
"SSL_CTX_get_cert_store() failed");
return NGX_ERROR;
}
store_ctx = X509_STORE_CTX_new();
if (store_ctx == NULL) {
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
"X509_STORE_CTX_new() failed");
return NGX_ERROR;
}
if (X509_STORE_CTX_init(store_ctx, store, NULL, NULL) == 0) {
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
"X509_STORE_CTX_init() failed");
X509_STORE_CTX_free(store_ctx);
return NGX_ERROR;
}
rc = X509_STORE_CTX_get1_issuer(&issuer, store_ctx, cert);
if (rc == -1) {
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
"X509_STORE_CTX_get1_issuer() failed");
X509_STORE_CTX_free(store_ctx);
return NGX_ERROR;
}
if (rc == 0) {
ngx_log_error(NGX_LOG_WARN, ssl->log, 0,
"\"ssl_stapling\" ignored, "
"issuer certificate not found for certificate \"%s\"",
staple->name);
X509_STORE_CTX_free(store_ctx);
return NGX_DECLINED;
}
X509_STORE_CTX_free(store_ctx);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ssl->log, 0,
"SSL get issuer: found %p in cert store", issuer);
staple->issuer = issuer;
return NGX_OK;
}
static ngx_int_t
ngx_ssl_stapling_responder(ngx_conf_t *cf, ngx_ssl_t *ssl,
ngx_ssl_stapling_t *staple, ngx_str_t *responder)
{
char *s;
ngx_str_t rsp;
ngx_url_t u;
STACK_OF(OPENSSL_STRING) *aia;
if (responder->len == 0) {
/* extract OCSP responder URL from certificate */
aia = X509_get1_ocsp(staple->cert);
if (aia == NULL) {
ngx_log_error(NGX_LOG_WARN, ssl->log, 0,
"\"ssl_stapling\" ignored, "
"no OCSP responder URL in the certificate \"%s\"",
staple->name);
return NGX_DECLINED;
}
#if OPENSSL_VERSION_NUMBER >= 0x10000000L
s = sk_OPENSSL_STRING_value(aia, 0);
#else
s = sk_value(aia, 0);
#endif
if (s == NULL) {
ngx_log_error(NGX_LOG_WARN, ssl->log, 0,
"\"ssl_stapling\" ignored, "
"no OCSP responder URL in the certificate \"%s\"",
staple->name);
X509_email_free(aia);
return NGX_DECLINED;
}
responder = &rsp;
responder->len = ngx_strlen(s);
responder->data = ngx_palloc(cf->pool, responder->len);
if (responder->data == NULL) {
X509_email_free(aia);
return NGX_ERROR;
}
ngx_memcpy(responder->data, s, responder->len);
X509_email_free(aia);
}
ngx_memzero(&u, sizeof(ngx_url_t));
u.url = *responder;
u.default_port = 80;
u.uri_part = 1;
if (u.url.len > 7
&& ngx_strncasecmp(u.url.data, (u_char *) "http://", 7) == 0)
{
u.url.len -= 7;
u.url.data += 7;
} else {
ngx_log_error(NGX_LOG_WARN, ssl->log, 0,
"\"ssl_stapling\" ignored, "
"invalid URL prefix in OCSP responder \"%V\" "
"in the certificate \"%s\"",
&u.url, staple->name);
return NGX_DECLINED;
}
if (ngx_parse_url(cf->pool, &u) != NGX_OK) {
if (u.err) {
ngx_log_error(NGX_LOG_WARN, ssl->log, 0,
"\"ssl_stapling\" ignored, "
"%s in OCSP responder \"%V\" "
"in the certificate \"%s\"",
u.err, &u.url, staple->name);
return NGX_DECLINED;
}
return NGX_ERROR;
}
staple->addrs = u.addrs;
staple->naddrs = u.naddrs;
staple->host = u.host;
staple->uri = u.uri;
staple->port = u.port;
if (staple->uri.len == 0) {
ngx_str_set(&staple->uri, "/");
}
return NGX_OK;
}
ngx_int_t
ngx_ssl_stapling_resolver(ngx_conf_t *cf, ngx_ssl_t *ssl,
ngx_resolver_t *resolver, ngx_msec_t resolver_timeout)
{
X509 *cert;
ngx_ssl_stapling_t *staple;
for (cert = SSL_CTX_get_ex_data(ssl->ctx, ngx_ssl_certificate_index);
cert;
cert = X509_get_ex_data(cert, ngx_ssl_next_certificate_index))
{
staple = X509_get_ex_data(cert, ngx_ssl_stapling_index);
staple->resolver = resolver;
staple->resolver_timeout = resolver_timeout;
}
return NGX_OK;
}
static int
ngx_ssl_certificate_status_callback(ngx_ssl_conn_t *ssl_conn, void *data)
{
int rc;
X509 *cert;
u_char *p;
ngx_connection_t *c;
ngx_ssl_stapling_t *staple;
c = ngx_ssl_get_connection(ssl_conn);
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
"SSL certificate status callback");
rc = SSL_TLSEXT_ERR_NOACK;
cert = SSL_get_certificate(ssl_conn);
if (cert == NULL) {
return rc;
}
staple = X509_get_ex_data(cert, ngx_ssl_stapling_index);
if (staple == NULL) {
return rc;
}
if (staple->staple.len
&& staple->valid >= ngx_time())
{
/* we have to copy ocsp response as OpenSSL will free it by itself */
p = OPENSSL_malloc(staple->staple.len);
if (p == NULL) {
ngx_ssl_error(NGX_LOG_ALERT, c->log, 0, "OPENSSL_malloc() failed");
return SSL_TLSEXT_ERR_NOACK;
}
ngx_memcpy(p, staple->staple.data, staple->staple.len);
SSL_set_tlsext_status_ocsp_resp(ssl_conn, p, staple->staple.len);
rc = SSL_TLSEXT_ERR_OK;
}
ngx_ssl_stapling_update(staple);
return rc;
}
static void
ngx_ssl_stapling_update(ngx_ssl_stapling_t *staple)
{
ngx_ssl_ocsp_ctx_t *ctx;
if (staple->host.len == 0
|| staple->loading || staple->refresh >= ngx_time())
{
return;
}
staple->loading = 1;
ctx = ngx_ssl_ocsp_start(ngx_cycle->log);
if (ctx == NULL) {
return;
}
ctx->ssl_ctx = staple->ssl_ctx;
ctx->cert = staple->cert;
ctx->issuer = staple->issuer;
ctx->chain = staple->chain;
ctx->name = staple->name;
ctx->flags = (staple->verify ? OCSP_TRUSTOTHER : OCSP_NOVERIFY);
ctx->addrs = staple->addrs;
ctx->naddrs = staple->naddrs;
ctx->host = staple->host;
ctx->uri = staple->uri;
ctx->port = staple->port;
ctx->timeout = staple->timeout;
ctx->resolver = staple->resolver;
ctx->resolver_timeout = staple->resolver_timeout;
ctx->handler = ngx_ssl_stapling_ocsp_handler;
ctx->data = staple;
ngx_ssl_ocsp_request(ctx);
return;
}
static void
ngx_ssl_stapling_ocsp_handler(ngx_ssl_ocsp_ctx_t *ctx)
{
time_t now;
ngx_str_t response;
ngx_ssl_stapling_t *staple;
staple = ctx->data;
now = ngx_time();
if (ngx_ssl_ocsp_verify(ctx) != NGX_OK) {
goto error;
}
if (ctx->status != V_OCSP_CERTSTATUS_GOOD) {
ngx_log_error(NGX_LOG_ERR, ctx->log, 0,
"certificate status \"%s\" in the OCSP response",
OCSP_cert_status_str(ctx->status));
goto error;
}
/* copy the response to memory not in ctx->pool */
response.len = ctx->response->last - ctx->response->pos;
response.data = ngx_alloc(response.len, ctx->log);
if (response.data == NULL) {
goto error;
}
ngx_memcpy(response.data, ctx->response->pos, response.len);
if (staple->staple.data) {
ngx_free(staple->staple.data);
}
staple->staple = response;
staple->valid = ctx->valid;
/*
* refresh before the response expires,
* but not earlier than in 5 minutes, and at least in an hour
*/
staple->loading = 0;
staple->refresh = ngx_max(ngx_min(ctx->valid - 300, now + 3600), now + 300);
ngx_ssl_ocsp_done(ctx);
return;
error:
staple->loading = 0;
staple->refresh = now + 300;
ngx_ssl_ocsp_done(ctx);
}
static time_t
ngx_ssl_stapling_time(ASN1_GENERALIZEDTIME *asn1time)
{
BIO *bio;
char *value;
size_t len;
time_t time;
/*
* OpenSSL doesn't provide a way to convert ASN1_GENERALIZEDTIME
* into time_t. To do this, we use ASN1_GENERALIZEDTIME_print(),
* which uses the "MMM DD HH:MM:SS YYYY [GMT]" format (e.g.,
* "Feb 3 00:55:52 2015 GMT"), and parse the result.
*/
bio = BIO_new(BIO_s_mem());
if (bio == NULL) {
return NGX_ERROR;
}
/* fake weekday prepended to match C asctime() format */
BIO_write(bio, "Tue ", sizeof("Tue ") - 1);
ASN1_GENERALIZEDTIME_print(bio, asn1time);
len = BIO_get_mem_data(bio, &value);
time = ngx_parse_http_time((u_char *) value, len);
BIO_free(bio);
return time;
}
static void
ngx_ssl_stapling_cleanup(void *data)
{
ngx_ssl_stapling_t *staple = data;
if (staple->issuer) {
X509_free(staple->issuer);
}
if (staple->staple.data) {
ngx_free(staple->staple.data);
}
}
ngx_int_t
ngx_ssl_ocsp(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *responder,
ngx_uint_t depth, ngx_shm_zone_t *shm_zone)
{
ngx_url_t u;
ngx_ssl_ocsp_conf_t *ocf;
ocf = ngx_pcalloc(cf->pool, sizeof(ngx_ssl_ocsp_conf_t));
if (ocf == NULL) {
return NGX_ERROR;
}
ocf->depth = depth;
ocf->shm_zone = shm_zone;
if (responder->len) {
ngx_memzero(&u, sizeof(ngx_url_t));
u.url = *responder;
u.default_port = 80;
u.uri_part = 1;
if (u.url.len > 7
&& ngx_strncasecmp(u.url.data, (u_char *) "http://", 7) == 0)
{
u.url.len -= 7;
u.url.data += 7;
} else {
ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
"invalid URL prefix in OCSP responder \"%V\" "
"in \"ssl_ocsp_responder\"", &u.url);
return NGX_ERROR;
}
if (ngx_parse_url(cf->pool, &u) != NGX_OK) {
if (u.err) {
ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
"%s in OCSP responder \"%V\" "
"in \"ssl_ocsp_responder\"", u.err, &u.url);
}
return NGX_ERROR;
}
ocf->addrs = u.addrs;
ocf->naddrs = u.naddrs;
ocf->host = u.host;
ocf->uri = u.uri;
ocf->port = u.port;
}
if (SSL_CTX_set_ex_data(ssl->ctx, ngx_ssl_ocsp_index, ocf) == 0) {
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
"SSL_CTX_set_ex_data() failed");
return NGX_ERROR;
}
return NGX_OK;
}
ngx_int_t
ngx_ssl_ocsp_resolver(ngx_conf_t *cf, ngx_ssl_t *ssl,
ngx_resolver_t *resolver, ngx_msec_t resolver_timeout)
{
ngx_ssl_ocsp_conf_t *ocf;
ocf = SSL_CTX_get_ex_data(ssl->ctx, ngx_ssl_ocsp_index);
ocf->resolver = resolver;
ocf->resolver_timeout = resolver_timeout;
return NGX_OK;
}
ngx_int_t
ngx_ssl_ocsp_validate(ngx_connection_t *c)
{
X509 *cert;
SSL_CTX *ssl_ctx;
ngx_int_t rc;
X509_STORE *store;
X509_STORE_CTX *store_ctx;
STACK_OF(X509) *chain;
ngx_ssl_ocsp_t *ocsp;
ngx_ssl_ocsp_conf_t *ocf;
if (c->ssl->in_ocsp) {
if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
return NGX_ERROR;
}
if (ngx_handle_write_event(c->write, 0) != NGX_OK) {
return NGX_ERROR;
}
return NGX_AGAIN;
}
ssl_ctx = SSL_get_SSL_CTX(c->ssl->connection);
ocf = SSL_CTX_get_ex_data(ssl_ctx, ngx_ssl_ocsp_index);
if (ocf == NULL) {
return NGX_OK;
}
if (SSL_get_verify_result(c->ssl->connection) != X509_V_OK) {
return NGX_OK;
}
cert = SSL_get_peer_certificate(c->ssl->connection);
if (cert == NULL) {
return NGX_OK;
}
ocsp = ngx_pcalloc(c->pool, sizeof(ngx_ssl_ocsp_t));
if (ocsp == NULL) {
X509_free(cert);
return NGX_ERROR;
}
c->ssl->ocsp = ocsp;
ocsp->status = NGX_AGAIN;
ocsp->cert_status = V_OCSP_CERTSTATUS_GOOD;
ocsp->conf = ocf;
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
ocsp->certs = SSL_get0_verified_chain(c->ssl->connection);
if (ocsp->certs) {
ocsp->certs = X509_chain_up_ref(ocsp->certs);
if (ocsp->certs == NULL) {
X509_free(cert);
return NGX_ERROR;
}
}
#endif
if (ocsp->certs == NULL) {
store = SSL_CTX_get_cert_store(ssl_ctx);
if (store == NULL) {
ngx_ssl_error(NGX_LOG_ERR, c->log, 0,
"SSL_CTX_get_cert_store() failed");
X509_free(cert);
return NGX_ERROR;
}
store_ctx = X509_STORE_CTX_new();
if (store_ctx == NULL) {
ngx_ssl_error(NGX_LOG_ERR, c->log, 0,
"X509_STORE_CTX_new() failed");
X509_free(cert);
return NGX_ERROR;
}
chain = SSL_get_peer_cert_chain(c->ssl->connection);
if (X509_STORE_CTX_init(store_ctx, store, cert, chain) == 0) {
ngx_ssl_error(NGX_LOG_ERR, c->log, 0,
"X509_STORE_CTX_init() failed");
X509_STORE_CTX_free(store_ctx);
X509_free(cert);
return NGX_ERROR;
}
rc = X509_verify_cert(store_ctx);
if (rc <= 0) {
ngx_ssl_error(NGX_LOG_ERR, c->log, 0, "X509_verify_cert() failed");
X509_STORE_CTX_free(store_ctx);
X509_free(cert);
return NGX_ERROR;
}
ocsp->certs = X509_STORE_CTX_get1_chain(store_ctx);
if (ocsp->certs == NULL) {
ngx_ssl_error(NGX_LOG_ERR, c->log, 0,
"X509_STORE_CTX_get1_chain() failed");
X509_STORE_CTX_free(store_ctx);
X509_free(cert);
return NGX_ERROR;
}
X509_STORE_CTX_free(store_ctx);
}
X509_free(cert);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
"ssl ocsp validate, certs:%d", sk_X509_num(ocsp->certs));
ngx_ssl_ocsp_validate_next(c);
if (ocsp->status == NGX_AGAIN) {
c->ssl->in_ocsp = 1;
return NGX_AGAIN;
}
return NGX_OK;
}
static void
ngx_ssl_ocsp_validate_next(ngx_connection_t *c)
{
ngx_int_t rc;
ngx_uint_t n;
ngx_ssl_ocsp_t *ocsp;
ngx_ssl_ocsp_ctx_t *ctx;
ngx_ssl_ocsp_conf_t *ocf;
ocsp = c->ssl->ocsp;
ocf = ocsp->conf;
n = sk_X509_num(ocsp->certs);
for ( ;; ) {
if (ocsp->ncert == n - 1 || (ocf->depth == 2 && ocsp->ncert == 1)) {
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
"ssl ocsp validated, certs:%ui", ocsp->ncert);
rc = NGX_OK;
goto done;
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
"ssl ocsp validate cert:%ui", ocsp->ncert);
ctx = ngx_ssl_ocsp_start(c->log);
if (ctx == NULL) {