| |
| /* |
| * 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_enum_t ngx_http_starttls_state[] = { |
| { ngx_string("off"), NGX_IMAP_STARTTLS_OFF }, |
| { ngx_string("on"), NGX_IMAP_STARTTLS_ON }, |
| { ngx_string("only"), NGX_IMAP_STARTTLS_ONLY }, |
| { ngx_null_string, 0 } |
| }; |
| |
| |
| |
| 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("starttls"), |
| NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1, |
| ngx_conf_set_enum_slot, |
| NGX_IMAP_SRV_CONF_OFFSET, |
| offsetof(ngx_imap_ssl_conf_t, starttls), |
| ngx_http_starttls_state }, |
| |
| { 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->starttls = 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); |
| ngx_conf_merge_value(conf->starttls, prev->starttls, NGX_IMAP_STARTTLS_OFF); |
| |
| if (conf->enable == 0 && conf->starttls == NGX_IMAP_STARTTLS_OFF) { |
| 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 |
