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comparison src/http/modules/ngx_http_ssl_module.c @ 5503:d049b0ea00a3

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SSL: ssl_session_tickets directive. This adds support so it's possible to explicitly disable SSL Session Tickets. In order to have good Forward Secrecy support either the session ticket key has to be reloaded by using nginx' binary upgrade process or using an external key file and reloading the configuration. This directive adds another possibility to have good support by disabling session tickets altogether. If session tickets are enabled and the process lives for a long a time, an attacker can grab the session ticket from the process and use that to decrypt any traffic that occured during the entire lifetime of the process.
author Dirkjan Bussink <d.bussink@gmail.com>
date Fri, 10 Jan 2014 16:12:40 +0100
parents a297b7ad6f94
children 8ed467553f6b
comparison
equal deleted inserted replaced
5502:4aa64f695031 5503:d049b0ea00a3
156 { ngx_string("ssl_session_cache"), 156 { ngx_string("ssl_session_cache"),
157 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE12, 157 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE12,
158 ngx_http_ssl_session_cache, 158 ngx_http_ssl_session_cache,
159 NGX_HTTP_SRV_CONF_OFFSET, 159 NGX_HTTP_SRV_CONF_OFFSET,
160 0, 160 0,
161 NULL },
162
163 { ngx_string("ssl_session_tickets"),
164 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG,
165 ngx_conf_set_flag_slot,
166 NGX_HTTP_SRV_CONF_OFFSET,
167 offsetof(ngx_http_ssl_srv_conf_t, session_tickets),
161 NULL }, 168 NULL },
162 169
163 { ngx_string("ssl_session_ticket_key"), 170 { ngx_string("ssl_session_ticket_key"),
164 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1, 171 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
165 ngx_conf_set_str_array_slot, 172 ngx_conf_set_str_array_slot,
434 sscf->buffer_size = NGX_CONF_UNSET_SIZE; 441 sscf->buffer_size = NGX_CONF_UNSET_SIZE;
435 sscf->verify = NGX_CONF_UNSET_UINT; 442 sscf->verify = NGX_CONF_UNSET_UINT;
436 sscf->verify_depth = NGX_CONF_UNSET_UINT; 443 sscf->verify_depth = NGX_CONF_UNSET_UINT;
437 sscf->builtin_session_cache = NGX_CONF_UNSET; 444 sscf->builtin_session_cache = NGX_CONF_UNSET;
438 sscf->session_timeout = NGX_CONF_UNSET; 445 sscf->session_timeout = NGX_CONF_UNSET;
446 sscf->session_tickets = NGX_CONF_UNSET;
439 sscf->session_ticket_keys = NGX_CONF_UNSET_PTR; 447 sscf->session_ticket_keys = NGX_CONF_UNSET_PTR;
440 sscf->stapling = NGX_CONF_UNSET; 448 sscf->stapling = NGX_CONF_UNSET;
441 sscf->stapling_verify = NGX_CONF_UNSET; 449 sscf->stapling_verify = NGX_CONF_UNSET;
442 450
443 return sscf; 451 return sscf;
642 != NGX_OK) 650 != NGX_OK)
643 { 651 {
644 return NGX_CONF_ERROR; 652 return NGX_CONF_ERROR;
645 } 653 }
646 654
655 ngx_conf_merge_value(conf->session_tickets, prev->session_tickets, 1);
656
657 #ifdef SSL_OP_NO_TICKET
658 if (!conf->session_tickets) {
659 SSL_CTX_set_options(conf->ssl.ctx, SSL_OP_NO_TICKET);
660 }
661 #endif
662
647 ngx_conf_merge_ptr_value(conf->session_ticket_keys, 663 ngx_conf_merge_ptr_value(conf->session_ticket_keys,
648 prev->session_ticket_keys, NULL); 664 prev->session_ticket_keys, NULL);
649 665
650 if (ngx_ssl_session_ticket_keys(cf, &conf->ssl, conf->session_ticket_keys) 666 if (ngx_ssl_session_ticket_keys(cf, &conf->ssl, conf->session_ticket_keys)
651 != NGX_OK) 667 != NGX_OK)