diff options
Diffstat (limited to 'modules/md/mod_md_ocsp.c')
| -rw-r--r-- | modules/md/mod_md_ocsp.c | 272 |
1 files changed, 272 insertions, 0 deletions
diff --git a/modules/md/mod_md_ocsp.c b/modules/md/mod_md_ocsp.c new file mode 100644 index 0000000..1d1e282 --- /dev/null +++ b/modules/md/mod_md_ocsp.c @@ -0,0 +1,272 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include <assert.h> +#include <apr_optional.h> +#include <apr_time.h> +#include <apr_date.h> +#include <apr_strings.h> + +#include <httpd.h> +#include <http_core.h> +#include <http_log.h> +#include <http_ssl.h> + +#include "mod_watchdog.h" + +#include "md.h" +#include "md_crypt.h" +#include "md_http.h" +#include "md_json.h" +#include "md_ocsp.h" +#include "md_store.h" +#include "md_log.h" +#include "md_reg.h" +#include "md_time.h" +#include "md_util.h" + +#include "mod_md.h" +#include "mod_md_config.h" +#include "mod_md_private.h" +#include "mod_md_ocsp.h" + +static int staple_here(md_srv_conf_t *sc) +{ + if (!sc || !sc->mc->ocsp) return 0; + if (sc->assigned + && sc->assigned->nelts == 1 + && APR_ARRAY_IDX(sc->assigned, 0, const md_t*)->stapling) return 1; + return (md_config_geti(sc, MD_CONFIG_STAPLING) + && md_config_geti(sc, MD_CONFIG_STAPLE_OTHERS)); +} + +int md_ocsp_prime_status(server_rec *s, apr_pool_t *p, + const char *id, apr_size_t id_len, const char *pem) +{ + md_srv_conf_t *sc; + const md_t *md; + apr_array_header_t *chain; + apr_status_t rv = APR_ENOENT; + + sc = md_config_get(s); + if (!staple_here(sc)) goto cleanup; + + md = ((sc->assigned && sc->assigned->nelts == 1)? + APR_ARRAY_IDX(sc->assigned, 0, const md_t*) : NULL); + chain = apr_array_make(p, 5, sizeof(md_cert_t*)); + rv = md_cert_read_chain(chain, p, pem, strlen(pem)); + if (APR_SUCCESS != rv) { + ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(10268) "init stapling for: %s, " + "unable to parse PEM data", md? md->name : s->server_hostname); + goto cleanup; + } + else if (chain->nelts < 2) { + ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(10269) "init stapling for: %s, " + "need at least 2 certificates in PEM data", md? md->name : s->server_hostname); + rv = APR_EINVAL; + goto cleanup; + } + + rv = md_ocsp_prime(sc->mc->ocsp, id, id_len, + APR_ARRAY_IDX(chain, 0, md_cert_t*), + APR_ARRAY_IDX(chain, 1, md_cert_t*), md); + ap_log_error(APLOG_MARK, APLOG_TRACE1, rv, s, "init stapling for: %s", + md? md->name : s->server_hostname); + +cleanup: + return (APR_SUCCESS == rv)? OK : DECLINED; +} + +typedef struct { + unsigned char *der; + apr_size_t der_len; +} ocsp_copy_ctx_t; + +int md_ocsp_provide_status(server_rec *s, conn_rec *c, + const char *id, apr_size_t id_len, + ap_ssl_ocsp_copy_resp *cb, void *userdata) +{ + md_srv_conf_t *sc; + const md_t *md; + apr_status_t rv; + + sc = md_config_get(s); + if (!staple_here(sc)) goto declined; + + md = ((sc->assigned && sc->assigned->nelts == 1)? + APR_ARRAY_IDX(sc->assigned, 0, const md_t*) : NULL); + ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, c, "get stapling for: %s", + md? md->name : s->server_hostname); + + rv = md_ocsp_get_status(cb, userdata, sc->mc->ocsp, id, id_len, c->pool, md); + if (APR_STATUS_IS_ENOENT(rv)) goto declined; + return OK; + +declined: + return DECLINED; +} + + +/**************************************************************************************************/ +/* watchdog based impl. */ + +#define MD_OCSP_WATCHDOG_NAME "_md_ocsp_" + +static APR_OPTIONAL_FN_TYPE(ap_watchdog_get_instance) *wd_get_instance; +static APR_OPTIONAL_FN_TYPE(ap_watchdog_register_callback) *wd_register_callback; +static APR_OPTIONAL_FN_TYPE(ap_watchdog_set_callback_interval) *wd_set_interval; + +typedef struct md_ocsp_ctx_t md_ocsp_ctx_t; + +struct md_ocsp_ctx_t { + apr_pool_t *p; + server_rec *s; + md_mod_conf_t *mc; + ap_watchdog_t *watchdog; +}; + +static apr_time_t next_run_default(void) +{ + /* we'd like to run at least hourly */ + return apr_time_now() + apr_time_from_sec(MD_SECS_PER_HOUR); +} + +static apr_status_t run_watchdog(int state, void *baton, apr_pool_t *ptemp) +{ + md_ocsp_ctx_t *octx = baton; + apr_time_t next_run, wait_time; + + /* mod_watchdog invoked us as a single thread inside the whole server (on this machine). + * This might be a repeated run inside the same child (mod_watchdog keeps affinity as + * long as the child lives) or another/new child. + */ + switch (state) { + case AP_WATCHDOG_STATE_STARTING: + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, octx->s, APLOGNO(10197) + "md ocsp watchdog start, ocsp stapling %d certificates", + (int)md_ocsp_count(octx->mc->ocsp)); + break; + + case AP_WATCHDOG_STATE_RUNNING: + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, octx->s, APLOGNO(10198) + "md ocsp watchdog run, ocsp stapling %d certificates", + (int)md_ocsp_count(octx->mc->ocsp)); + + /* Process all drive jobs. They will update their next_run property + * and we schedule ourself at the earliest of all. A job may specify 0 + * as next_run to indicate that it wants to participate in the normal + * regular runs. */ + next_run = next_run_default(); + + md_ocsp_renew(octx->mc->ocsp, octx->p, ptemp, &next_run); + + wait_time = next_run - apr_time_now(); + if (APLOGdebug(octx->s)) { + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, octx->s, APLOGNO(10199) + "md ocsp watchdog next run in %s", + md_duration_print(ptemp, wait_time)); + } + wd_set_interval(octx->watchdog, wait_time, octx, run_watchdog); + break; + + case AP_WATCHDOG_STATE_STOPPING: + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, octx->s, APLOGNO(10200) + "md ocsp watchdog stopping"); + break; + } + + return APR_SUCCESS; +} + +static apr_status_t ocsp_remove_old_responses(md_mod_conf_t *mc, apr_pool_t *p) +{ + md_timeperiod_t keep_norm, keep; + + keep_norm.end = apr_time_now(); + keep_norm.start = keep_norm.end - MD_TIME_OCSP_KEEP_NORM; + keep = md_timeperiod_slice_before_end(&keep_norm, mc->ocsp_keep_window); + /* remove any ocsp response older than keep.start */ + return md_ocsp_remove_responses_older_than(mc->ocsp, p, keep.start); +} + +apr_status_t md_ocsp_start_watching(md_mod_conf_t *mc, server_rec *s, apr_pool_t *p) +{ + apr_allocator_t *allocator; + md_ocsp_ctx_t *octx; + apr_pool_t *octxp; + apr_status_t rv; + + wd_get_instance = APR_RETRIEVE_OPTIONAL_FN(ap_watchdog_get_instance); + wd_register_callback = APR_RETRIEVE_OPTIONAL_FN(ap_watchdog_register_callback); + wd_set_interval = APR_RETRIEVE_OPTIONAL_FN(ap_watchdog_set_callback_interval); + + if (!wd_get_instance || !wd_register_callback || !wd_set_interval) { + ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s, APLOGNO(10201) + "mod_watchdog is required for OCSP stapling"); + return APR_EGENERAL; + } + + /* We want our own pool with own allocator to keep data across watchdog invocations. + * Since we'll run in a single watchdog thread, using our own allocator will prevent + * any confusion in the parent pool. */ + apr_allocator_create(&allocator); + apr_allocator_max_free_set(allocator, 1); + rv = apr_pool_create_ex(&octxp, p, NULL, allocator); + if (rv != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(10205) "md_ocsp_watchdog: create pool"); + return rv; + } + apr_allocator_owner_set(allocator, octxp); + apr_pool_tag(octxp, "md_ocsp_watchdog"); + + octx = apr_pcalloc(octxp, sizeof(*octx)); + octx->p = octxp; + octx->s = s; + octx->mc = mc; + + /* Time for some house keeping, before the server goes live (again): + * - we store OCSP responses for each certificate individually by its SHA-1 id + * - this means, as long as certificate do not change, the number of response + * files remains stable. + * - But when a certificate changes (is replaced), the response is obsolete + * - we do not get notified when a certificate is no longer used. An admin + * might just reconfigure or change the content of a file (backup/restore etc.) + * - also, certificates might be added by some openssl config commands or other + * modules that we do not immediately see right at startup. We cannot assume + * that any OCSP response we cannot relate to a certificate RIGHT NOW, is no + * longer needed. + * - since the response files are relatively small, we have no problem with + * keeping them around for a while. We just do not want an ever growing store. + * - The simplest and effective way seems to be to just remove files older + * a certain amount of time. Take a 7 day default and let the admin configure + * it for very special setups. + */ + ocsp_remove_old_responses(mc, octx->p); + + rv = wd_get_instance(&octx->watchdog, MD_OCSP_WATCHDOG_NAME, 0, 1, octx->p); + if (APR_SUCCESS != rv) { + ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s, APLOGNO(10202) + "create md ocsp watchdog(%s)", MD_OCSP_WATCHDOG_NAME); + return rv; + } + rv = wd_register_callback(octx->watchdog, 0, octx, run_watchdog); + ap_log_error(APLOG_MARK, rv? APLOG_CRIT : APLOG_DEBUG, rv, s, APLOGNO(10203) + "register md ocsp watchdog(%s)", MD_OCSP_WATCHDOG_NAME); + return rv; +} + + + |