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ngx_rtmp_ssl_module.c
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ngx_rtmp_ssl_module.c
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/*
* RTMPS supporting module
* Copyright (C) Ilya Panfilov
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include "ngx_rtmp_ssl_module.h"
#define NGX_RTMPS_DEFAULT_CIPHERS "HIGH:MEDIUM:!aNULL:!eNULL"
#define NGX_RTMPS_DEFAULT_ECDH_CURVE "prime256v1"
#define NGX_RTMPS_DEFAULT_PROTOCOLS NGX_SSL_SSLv2 \
| NGX_SSL_SSLv3 \
| NGX_SSL_TLSv1 \
| NGX_SSL_TLSv1_1 \
| NGX_SSL_TLSv1_2
static void *ngx_rtmp_ssl_create_srv_conf(ngx_conf_t *cf);
static char *ngx_rtmp_ssl_merge_srv_conf(ngx_conf_t *cf,
void *parent, void *child);
void ngx_rtmp_ssl_handshake(ngx_rtmp_session_t *s);
static void ngx_rtmp_ssl_handshake_handler(ngx_connection_t *c);
static ngx_conf_bitmask_t ngx_rtmp_ssl_protocols[] = {
{ ngx_string("SSLv2"), NGX_SSL_SSLv2 },
{ ngx_string("SSLv3"), NGX_SSL_SSLv3 },
{ ngx_string("TLSv1"), NGX_SSL_TLSv1 },
{ ngx_string("TLSv1.1"), NGX_SSL_TLSv1_1 },
{ ngx_string("TLSv1.2"), NGX_SSL_TLSv1_2 },
{ ngx_null_string, 0 }
};
static ngx_command_t ngx_rtmp_ssl_commands[] = {
{ ngx_string("ssl_protocols"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_CONF_1MORE,
ngx_conf_set_bitmask_slot,
NGX_RTMP_SRV_CONF_OFFSET,
offsetof(ngx_rtmp_ssl_srv_conf_t, protocols),
&ngx_rtmp_ssl_protocols },
{ ngx_string("ssl_certificate"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_RTMP_SRV_CONF_OFFSET,
offsetof(ngx_rtmp_ssl_srv_conf_t, certificate),
NULL },
{ ngx_string("ssl_certificate_key"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_RTMP_SRV_CONF_OFFSET,
offsetof(ngx_rtmp_ssl_srv_conf_t, certificate_key),
NULL },
{ ngx_string("ssl_password_file"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_RTMP_SRV_CONF_OFFSET,
offsetof(ngx_rtmp_ssl_srv_conf_t, password_file),
NULL },
{ ngx_string("ssl_ciphers"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_RTMP_SRV_CONF_OFFSET,
offsetof(ngx_rtmp_ssl_srv_conf_t, ciphers),
NULL },
{ ngx_string("ssl_prefer_server_ciphers"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_RTMP_SRV_CONF_OFFSET,
offsetof(ngx_rtmp_ssl_srv_conf_t, prefer_server_ciphers),
NULL },
{ ngx_string("ssl_dhparam"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_RTMP_SRV_CONF_OFFSET,
offsetof(ngx_rtmp_ssl_srv_conf_t, dhparam),
NULL },
{ ngx_string("ssl_ecdh_curve"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_RTMP_SRV_CONF_OFFSET,
offsetof(ngx_rtmp_ssl_srv_conf_t, ecdh_curve),
NULL },
ngx_null_command
};
static ngx_rtmp_module_t ngx_rtmp_ssl_module_ctx = {
NULL, /* preconfiguration */
NULL, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
ngx_rtmp_ssl_create_srv_conf, /* create server configuration */
ngx_rtmp_ssl_merge_srv_conf, /* merge server configuration */
NULL, /* create app configuration */
NULL /* merge app configuration */
};
ngx_module_t ngx_rtmp_ssl_module = {
NGX_MODULE_V1,
&ngx_rtmp_ssl_module_ctx, /* module context */
ngx_rtmp_ssl_commands, /* module directives */
NGX_RTMP_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
ngx_int_t
ngx_rtmp_ssl_enable(ngx_conf_t *cf)
{
ngx_rtmp_ssl_srv_conf_t *sscf;
sscf = ngx_rtmp_conf_get_module_srv_conf(cf, ngx_rtmp_ssl_module);
sscf->enable = 1;
return NGX_OK;
}
static void *
ngx_rtmp_ssl_create_srv_conf(ngx_conf_t *cf)
{
ngx_rtmp_ssl_srv_conf_t *sscf;
sscf = ngx_pcalloc(cf->pool, sizeof(ngx_rtmp_ssl_srv_conf_t));
if (sscf == NULL) {
return NULL;
}
sscf->prefer_server_ciphers = NGX_CONF_UNSET;
return sscf;
}
static char *
ngx_rtmp_ssl_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
{
ngx_rtmp_ssl_srv_conf_t *prev = parent;
ngx_rtmp_ssl_srv_conf_t *conf = child;
ngx_pool_cleanup_t *cln;
ngx_array_t *passwords = NULL;
conf->ssl.log = cf->log;
if (!conf->enable) {
return NGX_CONF_OK;
}
ngx_conf_merge_str_value(conf->certificate, prev->certificate, "");
if (conf->certificate.len == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "Missing ssl_certificate");
return NGX_CONF_ERROR;
}
ngx_conf_merge_str_value(conf->certificate_key, prev->certificate_key, "");
if (conf->certificate_key.len == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "Missing ssl_certificate_key");
return NGX_CONF_ERROR;
}
ngx_conf_merge_bitmask_value(conf->protocols, prev->protocols,
NGX_CONF_BITMASK_SET
|NGX_RTMPS_DEFAULT_PROTOCOLS);
ngx_conf_merge_str_value(conf->password_file, prev->password_file, "");
ngx_conf_merge_str_value(conf->dhparam, prev->dhparam, "");
ngx_conf_merge_str_value(conf->ecdh_curve, prev->ecdh_curve,
NGX_RTMPS_DEFAULT_ECDH_CURVE);
ngx_conf_merge_str_value(conf->ciphers, prev->ciphers,
NGX_RTMPS_DEFAULT_CIPHERS);
ngx_conf_merge_value(conf->prefer_server_ciphers,
prev->prefer_server_ciphers, 0);
if (ngx_ssl_create(&conf->ssl, conf->protocols, conf) != NGX_OK) {
return NGX_CONF_ERROR;
}
cln = ngx_pool_cleanup_add(cf->pool, 0);
if (cln == NULL) {
return NGX_CONF_ERROR;
}
cln->handler = ngx_ssl_cleanup_ctx;
cln->data = &conf->ssl;
if (conf->password_file.len > 0) {
passwords = ngx_ssl_read_password_file(cf, &conf->password_file);
if (passwords == NULL) {
return NGX_CONF_ERROR;
}
}
if (ngx_ssl_certificate(cf, &conf->ssl, &conf->certificate,
&conf->certificate_key, passwords)
!= NGX_OK)
{
return NGX_CONF_ERROR;
}
if (SSL_CTX_set_cipher_list(conf->ssl.ctx,
(const char *) conf->ciphers.data)
== 0)
{
ngx_ssl_error(NGX_LOG_EMERG, cf->log, 0,
"SSL_CTX_set_cipher_list(%V) failed", &conf->ciphers);
return NGX_CONF_ERROR;
}
if (conf->prefer_server_ciphers) {
SSL_CTX_set_options(conf->ssl.ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
}
if (ngx_ssl_dhparam(cf, &conf->ssl, &conf->dhparam) != NGX_OK) {
return NGX_CONF_ERROR;
}
if (ngx_ssl_ecdh_curve(cf, &conf->ssl, &conf->ecdh_curve) != NGX_OK) {
return NGX_CONF_ERROR;
}
SSL_CTX_set_options(conf->ssl.ctx, SSL_OP_NO_TICKET);
return NGX_CONF_OK;
}
void
ngx_rtmp_ssl_handshake(ngx_rtmp_session_t *s)
{
ngx_connection_t *c;
ngx_rtmp_ssl_srv_conf_t *sscf;
c = s->connection;
sscf = ngx_rtmp_get_module_srv_conf(s, ngx_rtmp_ssl_module);
if (ngx_ssl_create_connection(&sscf->ssl, c, 0) != NGX_OK)
{
ngx_rtmp_finalize_session(s);
return;
}
ngx_rtmp_ssl_handshake_handler(c);
return;
}
static void
ngx_rtmp_ssl_handshake_handler(ngx_connection_t *c)
{
ngx_rtmp_session_t *s;
ngx_event_t *rev;
ngx_int_t rc;
s = c->data;
if (c->ssl->handshaked) {
ngx_rtmp_handshake(s);
return;
}
if (c->read->timedout) {
ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "SSL handshake timed out");
ngx_rtmp_finalize_session(s);
return;
}
if (c->read->error || c->write->error || c->error) {
ngx_log_error(NGX_LOG_INFO, c->log, 0, "SSL handshake failed: c%d w%d r%d",
c->error, c->write->error, c->read->error);
ngx_rtmp_finalize_session(s);
return;
}
rc = ngx_ssl_handshake(c);
if (rc == NGX_AGAIN) {
rev = c->read;
if (!rev->timer_set) {
ngx_add_timer(rev, s->timeout);
}
c->ssl->handler = ngx_rtmp_ssl_handshake_handler;
return;
}
if (rc == NGX_OK) {
ngx_rtmp_handshake(s);
return;
}
ngx_rtmp_finalize_session(s);
return;
}