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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_imap.h>
#define NGX_DEFLAUT_CERTIFICATE "cert.pem"
#define NGX_DEFLAUT_CERTIFICATE_KEY "cert.pem"
#define NGX_DEFLAUT_CIPHERS "ALL:!ADH:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP"
static void *ngx_imap_ssl_create_conf(ngx_conf_t *cf);
static char *ngx_imap_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child);
#if !defined (SSL_OP_CIPHER_SERVER_PREFERENCE)
static char *ngx_imap_ssl_nosupported(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char ngx_imap_ssl_openssl097[] = "OpenSSL 0.9.7 and higher";
#endif
static ngx_conf_bitmask_t ngx_imap_ssl_protocols[] = {
{ ngx_string("SSLv2"), NGX_SSL_SSLv2 },
{ ngx_string("SSLv3"), NGX_SSL_SSLv3 },
{ ngx_string("TLSv1"), NGX_SSL_TLSv1 },
{ ngx_null_string, 0 }
};
static ngx_command_t ngx_imap_ssl_commands[] = {
{ ngx_string("ssl"),
NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_IMAP_SRV_CONF_OFFSET,
offsetof(ngx_imap_ssl_conf_t, enable),
NULL },
{ ngx_string("ssl_certificate"),
NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_IMAP_SRV_CONF_OFFSET,
offsetof(ngx_imap_ssl_conf_t, certificate),
NULL },
{ ngx_string("ssl_certificate_key"),
NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_IMAP_SRV_CONF_OFFSET,
offsetof(ngx_imap_ssl_conf_t, certificate_key),
NULL },
{ ngx_string("ssl_protocols"),
NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_1MORE,
ngx_conf_set_bitmask_slot,
NGX_IMAP_SRV_CONF_OFFSET,
offsetof(ngx_imap_ssl_conf_t, protocols),
&ngx_imap_ssl_protocols },
{ ngx_string("ssl_ciphers"),
NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_IMAP_SRV_CONF_OFFSET,
offsetof(ngx_imap_ssl_conf_t, ciphers),
NULL },
{ ngx_string("ssl_prefer_server_ciphers"),
NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_FLAG,
#ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
ngx_conf_set_flag_slot,
NGX_IMAP_SRV_CONF_OFFSET,
offsetof(ngx_imap_ssl_conf_t, prefer_server_ciphers),
NULL },
#else
ngx_imap_ssl_nosupported, 0, 0, ngx_imap_ssl_openssl097 },
#endif
{ ngx_string("ssl_session_timeout"),
NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_sec_slot,
NGX_IMAP_SRV_CONF_OFFSET,
offsetof(ngx_imap_ssl_conf_t, session_timeout),
NULL },
ngx_null_command
};
static ngx_imap_module_t ngx_imap_ssl_module_ctx = {
NULL, /* create main configuration */
NULL, /* init main configuration */
ngx_imap_ssl_create_conf, /* create server configuration */
ngx_imap_ssl_merge_conf /* merge server configuration */
};
ngx_module_t ngx_imap_ssl_module = {
NGX_MODULE_V1,
&ngx_imap_ssl_module_ctx, /* module context */
ngx_imap_ssl_commands, /* module directives */
NGX_IMAP_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
};
static u_char ngx_imap_session_id_ctx[] = "IMAP";
static void *
ngx_imap_ssl_create_conf(ngx_conf_t *cf)
{
ngx_imap_ssl_conf_t *scf;
scf = ngx_pcalloc(cf->pool, sizeof(ngx_imap_ssl_conf_t));
if (scf == NULL) {
return NGX_CONF_ERROR;
}
/*
* set by ngx_pcalloc():
*
* scf->protocols = 0;
*
* scf->certificate.len = 0;
* scf->certificate.data = NULL;
* scf->certificate_key.len = 0;
* scf->certificate_key.data = NULL;
* scf->ciphers.len = 0;
* scf->ciphers.data = NULL;
*/
scf->enable = NGX_CONF_UNSET;
scf->session_timeout = NGX_CONF_UNSET;
scf->prefer_server_ciphers = NGX_CONF_UNSET;
return scf;
}
static char *
ngx_imap_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child)
{
ngx_imap_ssl_conf_t *prev = parent;
ngx_imap_ssl_conf_t *conf = child;
ngx_pool_cleanup_t *cln;
ngx_conf_merge_value(conf->enable, prev->enable, 0);
if (conf->enable == 0) {
return NGX_CONF_OK;
}
ngx_conf_merge_value(conf->session_timeout,
prev->session_timeout, 300);
ngx_conf_merge_value(conf->prefer_server_ciphers,
prev->prefer_server_ciphers, 0);
ngx_conf_merge_bitmask_value(conf->protocols, prev->protocols,
(NGX_CONF_BITMASK_SET
|NGX_SSL_SSLv2|NGX_SSL_SSLv3|NGX_SSL_TLSv1));
ngx_conf_merge_str_value(conf->certificate, prev->certificate,
NGX_DEFLAUT_CERTIFICATE);
ngx_conf_merge_str_value(conf->certificate_key, prev->certificate_key,
NGX_DEFLAUT_CERTIFICATE_KEY);
ngx_conf_merge_str_value(conf->ciphers, prev->ciphers, NGX_DEFLAUT_CIPHERS);
conf->ssl.log = cf->log;
if (ngx_ssl_create(&conf->ssl, conf->protocols) != 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 (ngx_ssl_certificate(cf, &conf->ssl, &conf->certificate,
&conf->certificate_key)
!= NGX_OK)
{
return NGX_CONF_ERROR;
}
if (conf->ciphers.len) {
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);
}
}
#ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
if (conf->prefer_server_ciphers) {
SSL_CTX_set_options(conf->ssl.ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
}
#endif
if (ngx_ssl_generate_rsa512_key(&conf->ssl) != NGX_OK) {
return NGX_CONF_ERROR;
}
SSL_CTX_set_session_cache_mode(conf->ssl.ctx, SSL_SESS_CACHE_SERVER);
SSL_CTX_set_session_id_context(conf->ssl.ctx, ngx_imap_session_id_ctx,
sizeof(ngx_imap_session_id_ctx) - 1);
SSL_CTX_set_timeout(conf->ssl.ctx, conf->session_timeout);
return NGX_CONF_OK;
}
#if !defined (SSL_OP_CIPHER_SERVER_PREFERENCE)
static char *
ngx_imap_ssl_nosupported(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"\"%V\" directive is available only in %s,",
&cmd->name, cmd->post);
return NGX_CONF_ERROR;
}
#endif
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