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SSL: ssl_session_tickets directive.

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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.
This commit is contained in:
Dirkjan Bussink 2014-01-10 16:12:40 +01:00
parent 8f702a573a
commit 58a240d773
4 changed files with 35 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
src/http/modules/ngx_http_ssl_module.c
View File

@ -160,6 +160,13 @@ static ngx_command_t ngx_http_ssl_commands[] = {
0,
NULL },
{ ngx_string("ssl_session_tickets"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_SRV_CONF_OFFSET,
offsetof(ngx_http_ssl_srv_conf_t, session_tickets),
NULL },
{ ngx_string("ssl_session_ticket_key"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_array_slot,
@ -436,6 +443,7 @@ ngx_http_ssl_create_srv_conf(ngx_conf_t *cf)
sscf->verify_depth = NGX_CONF_UNSET_UINT;
sscf->builtin_session_cache = NGX_CONF_UNSET;
sscf->session_timeout = NGX_CONF_UNSET;
sscf->session_tickets = NGX_CONF_UNSET;
sscf->session_ticket_keys = NGX_CONF_UNSET_PTR;
sscf->stapling = NGX_CONF_UNSET;
sscf->stapling_verify = NGX_CONF_UNSET;
@ -644,6 +652,14 @@ ngx_http_ssl_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
return NGX_CONF_ERROR;
}
ngx_conf_merge_value(conf->session_tickets, prev->session_tickets, 1);
#ifdef SSL_OP_NO_TICKET
if (!conf->session_tickets) {
SSL_CTX_set_options(conf->ssl.ctx, SSL_OP_NO_TICKET);
}
#endif
ngx_conf_merge_ptr_value(conf->session_ticket_keys,
prev->session_ticket_keys, NULL);

1
src/http/modules/ngx_http_ssl_module.h
View File

@ -44,6 +44,7 @@ typedef struct {
ngx_shm_zone_t *shm_zone;
ngx_flag_t session_tickets;
ngx_array_t *session_ticket_keys;
ngx_flag_t stapling;

17
src/mail/ngx_mail_ssl_module.c
View File

@ -116,6 +116,13 @@ static ngx_command_t ngx_mail_ssl_commands[] = {
0,
NULL },
{ ngx_string("ssl_session_tickets"),
NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_MAIL_SRV_CONF_OFFSET,
offsetof(ngx_mail_ssl_conf_t, session_tickets),
NULL },
{ ngx_string("ssl_session_ticket_key"),
NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_array_slot,
@ -191,6 +198,7 @@ ngx_mail_ssl_create_conf(ngx_conf_t *cf)
scf->prefer_server_ciphers = NGX_CONF_UNSET;
scf->builtin_session_cache = NGX_CONF_UNSET;
scf->session_timeout = NGX_CONF_UNSET;
scf->session_tickets = NGX_CONF_UNSET;
scf->session_ticket_keys = NGX_CONF_UNSET_PTR;
return scf;
@ -339,6 +347,15 @@ ngx_mail_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child)
return NGX_CONF_ERROR;
}
ngx_conf_merge_value(conf->session_tickets,
prev->session_tickets, 1);
#ifdef SSL_OP_NO_TICKET
if (!conf->session_tickets) {
SSL_CTX_set_options(conf->ssl.ctx, SSL_OP_NO_TICKET);
}
#endif
ngx_conf_merge_ptr_value(conf->session_ticket_keys,
prev->session_ticket_keys, NULL);

1
src/mail/ngx_mail_ssl_module.h
View File

@ -41,6 +41,7 @@ typedef struct {
ngx_shm_zone_t *shm_zone;
ngx_flag_t session_tickets;
ngx_array_t *session_ticket_keys;
u_char *file;