/* * Copyright (C) Maxim Dounin * Copyright (C) Nginx, Inc. */ #include #include #include #include #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_str_t host; ngx_str_t uri; in_port_t port; SSL_CTX *ssl_ctx; X509 *cert; X509 *issuer; time_t valid; time_t refresh; unsigned verify:1; unsigned loading:1; } ngx_ssl_stapling_t; typedef struct ngx_ssl_ocsp_ctx_s ngx_ssl_ocsp_ctx_t; struct ngx_ssl_ocsp_ctx_s { X509 *cert; X509 *issuer; ngx_uint_t naddrs; 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 *r); void *data; ngx_buf_t *request; ngx_buf_t *response; ngx_peer_connection_t peer; ngx_int_t (*process)(ngx_ssl_ocsp_ctx_t *r); ngx_uint_t state; ngx_uint_t code; ngx_uint_t count; 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_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 ngx_ssl_ocsp_ctx_t *ngx_ssl_ocsp_start(void); static void ngx_ssl_ocsp_done(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 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; 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; cert = SSL_CTX_get_ex_data(ssl->ctx, ngx_ssl_certificate_index); 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; } staple->ssl_ctx = ssl->ctx; staple->timeout = 60000; staple->verify = verify; staple->cert = cert; if (file->len) { /* use OCSP response from the file */ if (ngx_ssl_stapling_file(cf, ssl, staple, file) != NGX_OK) { return NGX_ERROR; } goto done; } 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; } done: SSL_CTX_set_tlsext_status_cb(ssl->ctx, ngx_ssl_certificate_status_callback); 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, "r"); 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; STACK_OF(X509) *chain; cert = staple->cert; #if OPENSSL_VERSION_NUMBER >= 0x10001000L SSL_CTX_get_extra_chain_certs(ssl->ctx, &chain); #else chain = ssl->ctx->extra_certs; #endif n = sk_X509_num(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(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"); 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) { ngx_url_t u; char *s; 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"); 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"); X509_email_free(aia); return NGX_DECLINED; } 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\"", &u.url); 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\"", u.err, &u.url); return NGX_DECLINED; } return NGX_ERROR; } staple->addrs = u.addrs; 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; cert = SSL_CTX_get_ex_data(ssl->ctx, ngx_ssl_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); 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(); if (ctx == NULL) { return; } ctx->cert = staple->cert; ctx->issuer = staple->issuer; ctx->addrs = staple->addrs; 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) { #if OPENSSL_VERSION_NUMBER >= 0x0090707fL const #endif u_char *p; int n; size_t len; time_t now, valid; ngx_str_t response; X509_STORE *store; STACK_OF(X509) *chain; OCSP_CERTID *id; OCSP_RESPONSE *ocsp; OCSP_BASICRESP *basic; ngx_ssl_stapling_t *staple; ASN1_GENERALIZEDTIME *thisupdate, *nextupdate; staple = ctx->data; now = ngx_time(); ocsp = NULL; basic = NULL; id = NULL; if (ctx->code != 200) { goto error; } /* check the response */ len = ctx->response->last - ctx->response->pos; p = ctx->response->pos; ocsp = d2i_OCSP_RESPONSE(NULL, &p, len); if (ocsp == NULL) { ngx_ssl_error(NGX_LOG_ERR, ctx->log, 0, "d2i_OCSP_RESPONSE() failed"); goto error; } n = OCSP_response_status(ocsp); if (n != OCSP_RESPONSE_STATUS_SUCCESSFUL) { ngx_log_error(NGX_LOG_ERR, ctx->log, 0, "OCSP response not successful (%d: %s)", n, OCSP_response_status_str(n)); goto error; } basic = OCSP_response_get1_basic(ocsp); if (basic == NULL) { ngx_ssl_error(NGX_LOG_ERR, ctx->log, 0, "OCSP_response_get1_basic() failed"); goto error; } store = SSL_CTX_get_cert_store(staple->ssl_ctx); if (store == NULL) { ngx_ssl_error(NGX_LOG_CRIT, ctx->log, 0, "SSL_CTX_get_cert_store() failed"); goto error; } #if OPENSSL_VERSION_NUMBER >= 0x10001000L SSL_CTX_get_extra_chain_certs(staple->ssl_ctx, &chain); #else chain = staple->ssl_ctx->extra_certs; #endif if (OCSP_basic_verify(basic, chain, store, staple->verify ? OCSP_TRUSTOTHER : OCSP_NOVERIFY) != 1) { ngx_ssl_error(NGX_LOG_ERR, ctx->log, 0, "OCSP_basic_verify() failed"); goto error; } id = OCSP_cert_to_id(NULL, ctx->cert, ctx->issuer); if (id == NULL) { ngx_ssl_error(NGX_LOG_CRIT, ctx->log, 0, "OCSP_cert_to_id() failed"); goto error; } if (OCSP_resp_find_status(basic, id, &n, NULL, NULL, &thisupdate, &nextupdate) != 1) { ngx_log_error(NGX_LOG_ERR, ctx->log, 0, "certificate status not found in the OCSP response"); goto error; } if (n != V_OCSP_CERTSTATUS_GOOD) { ngx_log_error(NGX_LOG_ERR, ctx->log, 0, "certificate status \"%s\" in the OCSP response", OCSP_cert_status_str(n)); goto error; } if (OCSP_check_validity(thisupdate, nextupdate, 300, -1) != 1) { ngx_ssl_error(NGX_LOG_ERR, ctx->log, 0, "OCSP_check_validity() failed"); goto error; } if (nextupdate) { valid = ngx_ssl_stapling_time(nextupdate); if (valid == (time_t) NGX_ERROR) { ngx_log_error(NGX_LOG_ERR, ctx->log, 0, "invalid nextUpdate time in certificate status"); goto error; } } else { valid = NGX_MAX_TIME_T_VALUE; } OCSP_CERTID_free(id); OCSP_BASICRESP_free(basic); OCSP_RESPONSE_free(ocsp); id = NULL; basic = NULL; ocsp = NULL; /* copy the response to memory not in ctx->pool */ response.len = len; response.data = ngx_alloc(response.len, ctx->log); if (response.data == NULL) { goto error; } ngx_memcpy(response.data, ctx->response->pos, response.len); ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ctx->log, 0, "ssl ocsp response, %s, %uz", OCSP_cert_status_str(n), response.len); if (staple->staple.data) { ngx_free(staple->staple.data); } staple->staple = response; staple->valid = 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(valid - 300, now + 3600), now + 300); ngx_ssl_ocsp_done(ctx); return; error: staple->loading = 0; staple->refresh = now + 300; if (id) { OCSP_CERTID_free(id); } if (basic) { OCSP_BASICRESP_free(basic); } if (ocsp) { OCSP_RESPONSE_free(ocsp); } ngx_ssl_ocsp_done(ctx); } static time_t ngx_ssl_stapling_time(ASN1_GENERALIZEDTIME *asn1time) { u_char *value; size_t len; time_t time; BIO *bio; /* * 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(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); } } static ngx_ssl_ocsp_ctx_t * ngx_ssl_ocsp_start(void) { ngx_log_t *log; ngx_pool_t *pool; ngx_ssl_ocsp_ctx_t *ctx; pool = ngx_create_pool(2048, ngx_cycle->log); if (pool == NULL) { return NULL; } ctx = ngx_pcalloc(pool, sizeof(ngx_ssl_ocsp_ctx_t)); if (ctx == NULL) { ngx_destroy_pool(pool); return NULL; } log = ngx_palloc(pool, sizeof(ngx_log_t)); if (log == NULL) { ngx_destroy_pool(pool); return NULL; } ctx->pool = pool; *log = *ctx->pool->log; ctx->pool->log = log; ctx->log = log; log->handler = ngx_ssl_ocsp_log_error; log->data = ctx; log->action = "requesting certificate status"; return ctx; } static void ngx_ssl_ocsp_done(ngx_ssl_ocsp_ctx_t *ctx) { ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ctx->log, 0, "ssl ocsp done"); if (ctx->peer.connection) { ngx_close_connection(ctx->peer.connection); } ngx_destroy_pool(ctx->pool); } static void ngx_ssl_ocsp_error(ngx_ssl_ocsp_ctx_t *ctx) { ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ctx->log, 0, "ssl ocsp error"); ctx->code = 0; ctx->handler(ctx); } static void ngx_ssl_ocsp_request(ngx_ssl_ocsp_ctx_t *ctx) { ngx_resolver_ctx_t *resolve, temp; ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ctx->log, 0, "ssl ocsp request"); if (ngx_ssl_ocsp_create_request(ctx) != NGX_OK) { ngx_ssl_ocsp_error(ctx); return; } if (ctx->resolver) { /* resolve OCSP responder hostname */ temp.name = ctx->host; resolve = ngx_resolve_start(ctx->resolver, &temp); if (resolve == NULL) { ngx_ssl_ocsp_error(ctx); return; } if (resolve == NGX_NO_RESOLVER) { ngx_log_error(NGX_LOG_WARN, ctx->log, 0, "no resolver defined to resolve %V", &ctx->host); goto connect; } resolve->name = ctx->host; resolve->handler = ngx_ssl_ocsp_resolve_handler; resolve->data = ctx; resolve->timeout = ctx->resolver_timeout; if (ngx_resolve_name(resolve) != NGX_OK) { ngx_ssl_ocsp_error(ctx); return; } return; } connect: ngx_ssl_ocsp_connect(ctx); } static void ngx_ssl_ocsp_resolve_handler(ngx_resolver_ctx_t *resolve) { ngx_ssl_ocsp_ctx_t *ctx = resolve->data; u_char *p; size_t len; in_port_t port; socklen_t socklen; ngx_uint_t i; struct sockaddr *sockaddr; ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ctx->log, 0, "ssl ocsp resolve handler"); if (resolve->state) { ngx_log_error(NGX_LOG_ERR, ctx->log, 0, "%V could not be resolved (%i: %s)", &resolve->name, resolve->state, ngx_resolver_strerror(resolve->state)); goto failed; } #if (NGX_DEBUG) { u_char text[NGX_SOCKADDR_STRLEN]; ngx_str_t addr; addr.data = text; for (i = 0; i < resolve->naddrs; i++) { addr.len = ngx_sock_ntop(resolve->addrs[i].sockaddr, resolve->addrs[i].socklen, text, NGX_SOCKADDR_STRLEN, 0); ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ctx->log, 0, "name was resolved to %V", &addr); } } #endif ctx->naddrs = resolve->naddrs; ctx->addrs = ngx_pcalloc(ctx->pool, ctx->naddrs * sizeof(ngx_addr_t)); if (ctx->addrs == NULL) { goto failed; } port = htons(ctx->port); for (i = 0; i < resolve->naddrs; i++) { socklen = resolve->addrs[i].socklen; sockaddr = ngx_palloc(ctx->pool, socklen); if (sockaddr == NULL) { goto failed; } ngx_memcpy(sockaddr, resolve->addrs[i].sockaddr, socklen); switch (sockaddr->sa_family) { #if (NGX_HAVE_INET6) case AF_INET6: ((struct sockaddr_in6 *) sockaddr)->sin6_port = port; break; #endif default: /* AF_INET */ ((struct sockaddr_in *) sockaddr)->sin_port = port; } ctx->addrs[i].sockaddr = sockaddr; ctx->addrs[i].socklen = socklen; p = ngx_pnalloc(ctx->pool, NGX_SOCKADDR_STRLEN); if (p == NULL) { goto failed; } len = ngx_sock_ntop(sockaddr, socklen, p, NGX_SOCKADDR_STRLEN, 1); ctx->addrs[i].name.len = len; ctx->addrs[i].name.data = p; } ngx_resolve_name_done(resolve); ngx_ssl_ocsp_connect(ctx); return; failed: ngx_resolve_name_done(resolve); ngx_ssl_ocsp_error(ctx); } static void ngx_ssl_ocsp_connect(ngx_ssl_ocsp_ctx_t *ctx) { ngx_int_t rc; ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ctx->log, 0, "ssl ocsp connect"); /* TODO: use all ip addresses */ ctx->peer.sockaddr = ctx->addrs[0].sockaddr; ctx->peer.socklen = ctx->addrs[0].socklen; ctx->peer.name = &ctx->addrs[0].name; ctx->peer.get = ngx_event_get_peer; ctx->peer.log = ctx->log; ctx->peer.log_error = NGX_ERROR_ERR; rc = ngx_event_connect_peer(&ctx->peer); ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ctx->log, 0, "ssl ocsp connect peer done"); if (rc == NGX_ERROR || rc == NGX_BUSY || rc == NGX_DECLINED) { ngx_ssl_ocsp_error(ctx); return; } ctx->peer.connection->data = ctx; ctx->peer.connection->pool = ctx->pool; ctx->peer.connection->read->handler = ngx_ssl_ocsp_read_handler; ctx->peer.connection->write->handler = ngx_ssl_ocsp_write_handler; ctx->process = ngx_ssl_ocsp_process_status_line; ngx_add_timer(ctx->peer.connection->read, ctx->timeout); ngx_add_timer(ctx->peer.connection->write, ctx->timeout); if (rc == NGX_OK) { ngx_ssl_ocsp_write_handler(ctx->peer.connection->write); return; } } static void ngx_ssl_ocsp_write_handler(ngx_event_t *wev) { ssize_t n, size; ngx_connection_t *c; ngx_ssl_ocsp_ctx_t *ctx; c = wev->data; ctx = c->data; ngx_log_debug0(NGX_LOG_DEBUG_EVENT, wev->log, 0, "ssl ocsp write handler"); if (wev->timedout) { ngx_log_error(NGX_LOG_ERR, wev->log, NGX_ETIMEDOUT, "OCSP responder timed out"); ngx_ssl_ocsp_error(ctx); return; } size = ctx->request->last - ctx->request->pos; n = ngx_send(c, ctx->request->pos, size); if (n == NGX_ERROR) { ngx_ssl_ocsp_error(ctx); return; } if (n > 0) { ctx->request->pos += n; if (n == size) { wev->handler = ngx_ssl_ocsp_dummy_handler; if (wev->timer_set) { ngx_del_timer(wev); } if (ngx_handle_write_event(wev, 0) != NGX_OK) { ngx_ssl_ocsp_error(ctx); } return; } } if (!wev->timer_set) { ngx_add_timer(wev, ctx->timeout); } } static void ngx_ssl_ocsp_read_handler(ngx_event_t *rev) { ssize_t n, size; ngx_int_t rc; ngx_ssl_ocsp_ctx_t *ctx; ngx_connection_t *c; c = rev->data; ctx = c->data; ngx_log_debug0(NGX_LOG_DEBUG_EVENT, rev->log, 0, "ssl ocsp read handler"); if (rev->timedout) { ngx_log_error(NGX_LOG_ERR, rev->log, NGX_ETIMEDOUT, "OCSP responder timed out"); ngx_ssl_ocsp_error(ctx); return; } if (ctx->response == NULL) { ctx->response = ngx_create_temp_buf(ctx->pool, 16384); if (ctx->response == NULL) { ngx_ssl_ocsp_error(ctx); return; } } for ( ;; ) { size = ctx->response->end - ctx->response->last; n = ngx_recv(c, ctx->response->last, size); if (n > 0) { ctx->response->last += n; rc = ctx->process(ctx); if (rc == NGX_ERROR) { ngx_ssl_ocsp_error(ctx); return; } continue; } if (n == NGX_AGAIN) { if (ngx_handle_read_event(rev, 0) != NGX_OK) { ngx_ssl_ocsp_error(ctx); } return; } break; } ctx->done = 1; rc = ctx->process(ctx); if (rc == NGX_DONE) { /* ctx->handler() was called */ return; } ngx_log_error(NGX_LOG_ERR, ctx->log, 0, "OCSP responder prematurely closed connection"); ngx_ssl_ocsp_error(ctx); } static void ngx_ssl_ocsp_dummy_handler(ngx_event_t *ev) { ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, 0, "ssl ocsp dummy handler"); } static ngx_int_t ngx_ssl_ocsp_create_request(ngx_ssl_ocsp_ctx_t *ctx) { int len; u_char *p; uintptr_t escape; ngx_str_t binary, base64; ngx_buf_t *b; OCSP_CERTID *id; OCSP_REQUEST *ocsp; ocsp = OCSP_REQUEST_new(); if (ocsp == NULL) { ngx_ssl_error(NGX_LOG_CRIT, ctx->log, 0, "OCSP_REQUEST_new() failed"); return NGX_ERROR; } id = OCSP_cert_to_id(NULL, ctx->cert, ctx->issuer); if (id == NULL) { ngx_ssl_error(NGX_LOG_CRIT, ctx->log, 0, "OCSP_cert_to_id() failed"); goto failed; } if (OCSP_request_add0_id(ocsp, id) == NULL) { ngx_ssl_error(NGX_LOG_CRIT, ctx->log, 0, "OCSP_request_add0_id() failed"); OCSP_CERTID_free(id); goto failed; } len = i2d_OCSP_REQUEST(ocsp, NULL); if (len <= 0) { ngx_ssl_error(NGX_LOG_CRIT, ctx->log, 0, "i2d_OCSP_REQUEST() failed"); goto failed; } binary.len = len; binary.data = ngx_palloc(ctx->pool, len); if (binary.data == NULL) { goto failed; } p = binary.data; len = i2d_OCSP_REQUEST(ocsp, &p); if (len <= 0) { ngx_ssl_error(NGX_LOG_EMERG, ctx->log, 0, "i2d_OCSP_REQUEST() failed"); goto failed; } base64.len = ngx_base64_encoded_length(binary.len); base64.data = ngx_palloc(ctx->pool, base64.len); if (base64.data == NULL) { goto failed; } ngx_encode_base64(&base64, &binary); escape = ngx_escape_uri(NULL, base64.data, base64.len, NGX_ESCAPE_URI_COMPONENT); ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ctx->log, 0, "ssl ocsp request length %z, escape %d", base64.len, (int) escape); len = sizeof("GET ") - 1 + ctx->uri.len + sizeof("/") - 1 + base64.len + 2 * escape + sizeof(" HTTP/1.0" CRLF) - 1 + sizeof("Host: ") - 1 + ctx->host.len + sizeof(CRLF) - 1 + sizeof(CRLF) - 1; b = ngx_create_temp_buf(ctx->pool, len); if (b == NULL) { goto failed; } p = b->last; p = ngx_cpymem(p, "GET ", sizeof("GET ") - 1); p = ngx_cpymem(p, ctx->uri.data, ctx->uri.len); if (ctx->uri.data[ctx->uri.len - 1] != '/') { *p++ = '/'; } if (escape == 0) { p = ngx_cpymem(p, base64.data, base64.len); } else { p = (u_char *) ngx_escape_uri(p, base64.data, base64.len, NGX_ESCAPE_URI_COMPONENT); } p = ngx_cpymem(p, " HTTP/1.0" CRLF, sizeof(" HTTP/1.0" CRLF) - 1); p = ngx_cpymem(p, "Host: ", sizeof("Host: ") - 1); p = ngx_cpymem(p, ctx->host.data, ctx->host.len); *p++ = CR; *p++ = LF; /* add "\r\n" at the header end */ *p++ = CR; *p++ = LF; b->last = p; ctx->request = b; OCSP_REQUEST_free(ocsp); return NGX_OK; failed: OCSP_REQUEST_free(ocsp); return NGX_ERROR; } static ngx_int_t ngx_ssl_ocsp_process_status_line(ngx_ssl_ocsp_ctx_t *ctx) { ngx_int_t rc; rc = ngx_ssl_ocsp_parse_status_line(ctx); if (rc == NGX_OK) { #if 0 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ctx->log, 0, "ssl ocsp status line \"%*s\"", ctx->response->pos - ctx->response->start, ctx->response->start); #endif ctx->process = ngx_ssl_ocsp_process_headers; return ctx->process(ctx); } if (rc == NGX_AGAIN) { return NGX_AGAIN; } /* rc == NGX_ERROR */ ngx_log_error(NGX_LOG_ERR, ctx->log, 0, "OCSP responder sent invalid response"); return NGX_ERROR; } static ngx_int_t ngx_ssl_ocsp_parse_status_line(ngx_ssl_ocsp_ctx_t *ctx) { u_char ch; u_char *p; ngx_buf_t *b; enum { sw_start = 0, sw_H, sw_HT, sw_HTT, sw_HTTP, sw_first_major_digit, sw_major_digit, sw_first_minor_digit, sw_minor_digit, sw_status, sw_space_after_status, sw_status_text, sw_almost_done } state; ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ctx->log, 0, "ssl ocsp process status line"); state = ctx->state; b = ctx->response; for (p = b->pos; p < b->last; p++) { ch = *p; switch (state) { /* "HTTP/" */ case sw_start: switch (ch) { case 'H': state = sw_H; break; default: return NGX_ERROR; } break; case sw_H: switch (ch) { case 'T': state = sw_HT; break; default: return NGX_ERROR; } break; case sw_HT: switch (ch) { case 'T': state = sw_HTT; break; default: return NGX_ERROR; } break; case sw_HTT: switch (ch) { case 'P': state = sw_HTTP; break; default: return NGX_ERROR; } break; case sw_HTTP: switch (ch) { case '/': state = sw_first_major_digit; break; default: return NGX_ERROR; } break; /* the first digit of major HTTP version */ case sw_first_major_digit: if (ch < '1' || ch > '9') { return NGX_ERROR; } state = sw_major_digit; break; /* the major HTTP version or dot */ case sw_major_digit: if (ch == '.') { state = sw_first_minor_digit; break; } if (ch < '0' || ch > '9') { return NGX_ERROR; } break; /* the first digit of minor HTTP version */ case sw_first_minor_digit: if (ch < '0' || ch > '9') { return NGX_ERROR; } state = sw_minor_digit; break; /* the minor HTTP version or the end of the request line */ case sw_minor_digit: if (ch == ' ') { state = sw_status; break; } if (ch < '0' || ch > '9') { return NGX_ERROR; } break; /* HTTP status code */ case sw_status: if (ch == ' ') { break; } if (ch < '0' || ch > '9') { return NGX_ERROR; } ctx->code = ctx->code * 10 + ch - '0'; if (++ctx->count == 3) { state = sw_space_after_status; } break; /* space or end of line */ case sw_space_after_status: switch (ch) { case ' ': state = sw_status_text; break; case '.': /* IIS may send 403.1, 403.2, etc */ state = sw_status_text; break; case CR: state = sw_almost_done; break; case LF: goto done; default: return NGX_ERROR; } break; /* any text until end of line */ case sw_status_text: switch (ch) { case CR: state = sw_almost_done; break; case LF: goto done; } break; /* end of status line */ case sw_almost_done: switch (ch) { case LF: goto done; default: return NGX_ERROR; } } } b->pos = p; ctx->state = state; return NGX_AGAIN; done: b->pos = p + 1; ctx->state = sw_start; return NGX_OK; } static ngx_int_t ngx_ssl_ocsp_process_headers(ngx_ssl_ocsp_ctx_t *ctx) { size_t len; ngx_int_t rc; ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ctx->log, 0, "ssl ocsp process headers"); for ( ;; ) { rc = ngx_ssl_ocsp_parse_header_line(ctx); if (rc == NGX_OK) { ngx_log_debug4(NGX_LOG_DEBUG_EVENT, ctx->log, 0, "ssl ocsp header \"%*s: %*s\"", ctx->header_name_end - ctx->header_name_start, ctx->header_name_start, ctx->header_end - ctx->header_start, ctx->header_start); len = ctx->header_name_end - ctx->header_name_start; if (len == sizeof("Content-Type") - 1 && ngx_strncasecmp(ctx->header_name_start, (u_char *) "Content-Type", sizeof("Content-Type") - 1) == 0) { len = ctx->header_end - ctx->header_start; if (len != sizeof("application/ocsp-response") - 1 || ngx_strncasecmp(ctx->header_start, (u_char *) "application/ocsp-response", sizeof("application/ocsp-response") - 1) != 0) { ngx_log_error(NGX_LOG_ERR, ctx->log, 0, "OCSP responder sent invalid " "\"Content-Type\" header: \"%*s\"", ctx->header_end - ctx->header_start, ctx->header_start); return NGX_ERROR; } continue; } /* TODO: honor Content-Length */ continue; } if (rc == NGX_DONE) { break; } if (rc == NGX_AGAIN) { return NGX_AGAIN; } /* rc == NGX_ERROR */ ngx_log_error(NGX_LOG_ERR, ctx->log, 0, "OCSP responder sent invalid response"); return NGX_ERROR; } ctx->process = ngx_ssl_ocsp_process_body; return ctx->process(ctx); } static ngx_int_t ngx_ssl_ocsp_parse_header_line(ngx_ssl_ocsp_ctx_t *ctx) { u_char c, ch, *p; enum { sw_start = 0, sw_name, sw_space_before_value, sw_value, sw_space_after_value, sw_almost_done, sw_header_almost_done } state; state = ctx->state; for (p = ctx->response->pos; p < ctx->response->last; p++) { ch = *p; #if 0 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ctx->log, 0, "s:%d in:'%02Xd:%c'", state, ch, ch); #endif switch (state) { /* first char */ case sw_start: switch (ch) { case CR: ctx->header_end = p; state = sw_header_almost_done; break; case LF: ctx->header_end = p; goto header_done; default: state = sw_name; ctx->header_name_start = p; c = (u_char) (ch | 0x20); if (c >= 'a' && c <= 'z') { break; } if (ch >= '0' && ch <= '9') { break; } return NGX_ERROR; } break; /* header name */ case sw_name: c = (u_char) (ch | 0x20); if (c >= 'a' && c <= 'z') { break; } if (ch == ':') { ctx->header_name_end = p; state = sw_space_before_value; break; } if (ch == '-') { break; } if (ch >= '0' && ch <= '9') { break; } if (ch == CR) { ctx->header_name_end = p; ctx->header_start = p; ctx->header_end = p; state = sw_almost_done; break; } if (ch == LF) { ctx->header_name_end = p; ctx->header_start = p; ctx->header_end = p; goto done; } return NGX_ERROR; /* space* before header value */ case sw_space_before_value: switch (ch) { case ' ': break; case CR: ctx->header_start = p; ctx->header_end = p; state = sw_almost_done; break; case LF: ctx->header_start = p; ctx->header_end = p; goto done; default: ctx->header_start = p; state = sw_value; break; } break; /* header value */ case sw_value: switch (ch) { case ' ': ctx->header_end = p; state = sw_space_after_value; break; case CR: ctx->header_end = p; state = sw_almost_done; break; case LF: ctx->header_end = p; goto done; } break; /* space* before end of header line */ case sw_space_after_value: switch (ch) { case ' ': break; case CR: state = sw_almost_done; break; case LF: goto done; default: state = sw_value; break; } break; /* end of header line */ case sw_almost_done: switch (ch) { case LF: goto done; default: return NGX_ERROR; } /* end of header */ case sw_header_almost_done: switch (ch) { case LF: goto header_done; default: return NGX_ERROR; } } } ctx->response->pos = p; ctx->state = state; return NGX_AGAIN; done: ctx->response->pos = p + 1; ctx->state = sw_start; return NGX_OK; header_done: ctx->response->pos = p + 1; ctx->state = sw_start; return NGX_DONE; } static ngx_int_t ngx_ssl_ocsp_process_body(ngx_ssl_ocsp_ctx_t *ctx) { ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ctx->log, 0, "ssl ocsp process body"); if (ctx->done) { ctx->handler(ctx); return NGX_DONE; } return NGX_AGAIN; } static u_char * ngx_ssl_ocsp_log_error(ngx_log_t *log, u_char *buf, size_t len) { u_char *p; ngx_ssl_ocsp_ctx_t *ctx; p = buf; if (log->action) { p = ngx_snprintf(buf, len, " while %s", log->action); len -= p - buf; } ctx = log->data; if (ctx) { p = ngx_snprintf(p, len, ", responder: %V", &ctx->host); } return p; } #else 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) { ngx_log_error(NGX_LOG_WARN, ssl->log, 0, "\"ssl_stapling\" ignored, not supported"); 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) { return NGX_OK; } #endif