Mercurial > hg > nginx-quic
view src/mail/ngx_mail_ssl_module.c @ 9021:f5515e727656
Fixed "zero size buf" alerts with subrequests.
Since 4611:2b6cb7528409 responses from the gzip static, flv, and mp4 modules
can be used with subrequests, though empty files were not properly handled.
Empty gzipped, flv, and mp4 files thus resulted in "zero size buf in output"
alerts. While valid corresponding files are not expected to be empty, such
files shouldn't result in alerts.
Fix is to set b->sync on such empty subrequest responses, similarly to what
ngx_http_send_special() does.
Additionally, the static module, the ngx_http_send_response() function, and
file cache are modified to do the same instead of not sending the response
body at all in such cases, since not sending the response body at all is
believed to be at least questionable, and might break various filters
which do not expect such behaviour.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Sat, 28 Jan 2023 05:23:33 +0300 |
parents | e32b48848add |
children | d1cf09451ae8 |
line wrap: on
line source
/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_mail.h> #define NGX_DEFAULT_CIPHERS "HIGH:!aNULL:!MD5" #define NGX_DEFAULT_ECDH_CURVE "auto" #ifdef TLSEXT_TYPE_application_layer_protocol_negotiation static int ngx_mail_ssl_alpn_select(ngx_ssl_conn_t *ssl_conn, const unsigned char **out, unsigned char *outlen, const unsigned char *in, unsigned int inlen, void *arg); #endif static void *ngx_mail_ssl_create_conf(ngx_conf_t *cf); static char *ngx_mail_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child); static char *ngx_mail_ssl_enable(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static char *ngx_mail_ssl_starttls(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static char *ngx_mail_ssl_password_file(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static char *ngx_mail_ssl_session_cache(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static char *ngx_mail_ssl_conf_command_check(ngx_conf_t *cf, void *post, void *data); static ngx_conf_enum_t ngx_mail_starttls_state[] = { { ngx_string("off"), NGX_MAIL_STARTTLS_OFF }, { ngx_string("on"), NGX_MAIL_STARTTLS_ON }, { ngx_string("only"), NGX_MAIL_STARTTLS_ONLY }, { ngx_null_string, 0 } }; static ngx_conf_bitmask_t ngx_mail_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_string("TLSv1.3"), NGX_SSL_TLSv1_3 }, { ngx_null_string, 0 } }; static ngx_conf_enum_t ngx_mail_ssl_verify[] = { { ngx_string("off"), 0 }, { ngx_string("on"), 1 }, { ngx_string("optional"), 2 }, { ngx_string("optional_no_ca"), 3 }, { ngx_null_string, 0 } }; static ngx_conf_deprecated_t ngx_mail_ssl_deprecated = { ngx_conf_deprecated, "ssl", "listen ... ssl" }; static ngx_conf_post_t ngx_mail_ssl_conf_command_post = { ngx_mail_ssl_conf_command_check }; static ngx_command_t ngx_mail_ssl_commands[] = { { ngx_string("ssl"), NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG, ngx_mail_ssl_enable, NGX_MAIL_SRV_CONF_OFFSET, offsetof(ngx_mail_ssl_conf_t, enable), &ngx_mail_ssl_deprecated }, { ngx_string("starttls"), NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, ngx_mail_ssl_starttls, NGX_MAIL_SRV_CONF_OFFSET, offsetof(ngx_mail_ssl_conf_t, starttls), ngx_mail_starttls_state }, { ngx_string("ssl_certificate"), NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_str_array_slot, NGX_MAIL_SRV_CONF_OFFSET, offsetof(ngx_mail_ssl_conf_t, certificates), NULL }, { ngx_string("ssl_certificate_key"), NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_str_array_slot, NGX_MAIL_SRV_CONF_OFFSET, offsetof(ngx_mail_ssl_conf_t, certificate_keys), NULL }, { ngx_string("ssl_password_file"), NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, ngx_mail_ssl_password_file, NGX_MAIL_SRV_CONF_OFFSET, 0, NULL }, { ngx_string("ssl_dhparam"), NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_str_slot, NGX_MAIL_SRV_CONF_OFFSET, offsetof(ngx_mail_ssl_conf_t, dhparam), NULL }, { ngx_string("ssl_ecdh_curve"), NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_str_slot, NGX_MAIL_SRV_CONF_OFFSET, offsetof(ngx_mail_ssl_conf_t, ecdh_curve), NULL }, { ngx_string("ssl_protocols"), NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE, ngx_conf_set_bitmask_slot, NGX_MAIL_SRV_CONF_OFFSET, offsetof(ngx_mail_ssl_conf_t, protocols), &ngx_mail_ssl_protocols }, { ngx_string("ssl_ciphers"), NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_str_slot, NGX_MAIL_SRV_CONF_OFFSET, offsetof(ngx_mail_ssl_conf_t, ciphers), NULL }, { ngx_string("ssl_prefer_server_ciphers"), 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, prefer_server_ciphers), NULL }, { ngx_string("ssl_session_cache"), NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE12, ngx_mail_ssl_session_cache, NGX_MAIL_SRV_CONF_OFFSET, 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, NGX_MAIL_SRV_CONF_OFFSET, offsetof(ngx_mail_ssl_conf_t, session_ticket_keys), NULL }, { ngx_string("ssl_session_timeout"), NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_sec_slot, NGX_MAIL_SRV_CONF_OFFSET, offsetof(ngx_mail_ssl_conf_t, session_timeout), NULL }, { ngx_string("ssl_verify_client"), NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_enum_slot, NGX_MAIL_SRV_CONF_OFFSET, offsetof(ngx_mail_ssl_conf_t, verify), &ngx_mail_ssl_verify }, { ngx_string("ssl_verify_depth"), NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_num_slot, NGX_MAIL_SRV_CONF_OFFSET, offsetof(ngx_mail_ssl_conf_t, verify_depth), NULL }, { ngx_string("ssl_client_certificate"), NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_str_slot, NGX_MAIL_SRV_CONF_OFFSET, offsetof(ngx_mail_ssl_conf_t, client_certificate), NULL }, { ngx_string("ssl_trusted_certificate"), NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_str_slot, NGX_MAIL_SRV_CONF_OFFSET, offsetof(ngx_mail_ssl_conf_t, trusted_certificate), NULL }, { ngx_string("ssl_crl"), NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_str_slot, NGX_MAIL_SRV_CONF_OFFSET, offsetof(ngx_mail_ssl_conf_t, crl), NULL }, { ngx_string("ssl_conf_command"), NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE2, ngx_conf_set_keyval_slot, NGX_MAIL_SRV_CONF_OFFSET, offsetof(ngx_mail_ssl_conf_t, conf_commands), &ngx_mail_ssl_conf_command_post }, ngx_null_command }; static ngx_mail_module_t ngx_mail_ssl_module_ctx = { NULL, /* protocol */ NULL, /* create main configuration */ NULL, /* init main configuration */ ngx_mail_ssl_create_conf, /* create server configuration */ ngx_mail_ssl_merge_conf /* merge server configuration */ }; ngx_module_t ngx_mail_ssl_module = { NGX_MODULE_V1, &ngx_mail_ssl_module_ctx, /* module context */ ngx_mail_ssl_commands, /* module directives */ NGX_MAIL_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 ngx_str_t ngx_mail_ssl_sess_id_ctx = ngx_string("MAIL"); #ifdef TLSEXT_TYPE_application_layer_protocol_negotiation static int ngx_mail_ssl_alpn_select(ngx_ssl_conn_t *ssl_conn, const unsigned char **out, unsigned char *outlen, const unsigned char *in, unsigned int inlen, void *arg) { unsigned int srvlen; unsigned char *srv; ngx_connection_t *c; ngx_mail_session_t *s; ngx_mail_core_srv_conf_t *cscf; #if (NGX_DEBUG) unsigned int i; #endif c = ngx_ssl_get_connection(ssl_conn); s = c->data; #if (NGX_DEBUG) for (i = 0; i < inlen; i += in[i] + 1) { ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0, "SSL ALPN supported by client: %*s", (size_t) in[i], &in[i + 1]); } #endif cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module); srv = cscf->protocol->alpn.data; srvlen = cscf->protocol->alpn.len; if (SSL_select_next_proto((unsigned char **) out, outlen, srv, srvlen, in, inlen) != OPENSSL_NPN_NEGOTIATED) { return SSL_TLSEXT_ERR_ALERT_FATAL; } ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0, "SSL ALPN selected: %*s", (size_t) *outlen, *out); return SSL_TLSEXT_ERR_OK; } #endif static void * ngx_mail_ssl_create_conf(ngx_conf_t *cf) { ngx_mail_ssl_conf_t *scf; scf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_ssl_conf_t)); if (scf == NULL) { return NULL; } /* * set by ngx_pcalloc(): * * scf->listen = 0; * scf->protocols = 0; * scf->dhparam = { 0, NULL }; * scf->ecdh_curve = { 0, NULL }; * scf->client_certificate = { 0, NULL }; * scf->trusted_certificate = { 0, NULL }; * scf->crl = { 0, NULL }; * scf->ciphers = { 0, NULL }; * scf->shm_zone = NULL; */ scf->enable = NGX_CONF_UNSET; scf->starttls = NGX_CONF_UNSET_UINT; scf->certificates = NGX_CONF_UNSET_PTR; scf->certificate_keys = NGX_CONF_UNSET_PTR; scf->passwords = NGX_CONF_UNSET_PTR; scf->conf_commands = NGX_CONF_UNSET_PTR; scf->prefer_server_ciphers = NGX_CONF_UNSET; scf->verify = NGX_CONF_UNSET_UINT; scf->verify_depth = NGX_CONF_UNSET_UINT; 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; } static char * ngx_mail_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_mail_ssl_conf_t *prev = parent; ngx_mail_ssl_conf_t *conf = child; char *mode; ngx_pool_cleanup_t *cln; ngx_conf_merge_value(conf->enable, prev->enable, 0); ngx_conf_merge_uint_value(conf->starttls, prev->starttls, NGX_MAIL_STARTTLS_OFF); 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_TLSv1 |NGX_SSL_TLSv1_1|NGX_SSL_TLSv1_2)); ngx_conf_merge_uint_value(conf->verify, prev->verify, 0); ngx_conf_merge_uint_value(conf->verify_depth, prev->verify_depth, 1); ngx_conf_merge_ptr_value(conf->certificates, prev->certificates, NULL); ngx_conf_merge_ptr_value(conf->certificate_keys, prev->certificate_keys, NULL); ngx_conf_merge_ptr_value(conf->passwords, prev->passwords, NULL); ngx_conf_merge_str_value(conf->dhparam, prev->dhparam, ""); ngx_conf_merge_str_value(conf->ecdh_curve, prev->ecdh_curve, NGX_DEFAULT_ECDH_CURVE); ngx_conf_merge_str_value(conf->client_certificate, prev->client_certificate, ""); ngx_conf_merge_str_value(conf->trusted_certificate, prev->trusted_certificate, ""); ngx_conf_merge_str_value(conf->crl, prev->crl, ""); ngx_conf_merge_str_value(conf->ciphers, prev->ciphers, NGX_DEFAULT_CIPHERS); ngx_conf_merge_ptr_value(conf->conf_commands, prev->conf_commands, NULL); conf->ssl.log = cf->log; if (conf->listen) { mode = "listen ... ssl"; } else if (conf->enable) { mode = "ssl"; } else if (conf->starttls != NGX_MAIL_STARTTLS_OFF) { mode = "starttls"; } else { return NGX_CONF_OK; } if (conf->file == NULL) { conf->file = prev->file; conf->line = prev->line; } if (conf->certificates == NULL) { ngx_log_error(NGX_LOG_EMERG, cf->log, 0, "no \"ssl_certificate\" is defined for " "the \"%s\" directive in %s:%ui", mode, conf->file, conf->line); return NGX_CONF_ERROR; } if (conf->certificate_keys == NULL) { ngx_log_error(NGX_LOG_EMERG, cf->log, 0, "no \"ssl_certificate_key\" is defined for " "the \"%s\" directive in %s:%ui", mode, conf->file, conf->line); return NGX_CONF_ERROR; } if (conf->certificate_keys->nelts < conf->certificates->nelts) { ngx_log_error(NGX_LOG_EMERG, cf->log, 0, "no \"ssl_certificate_key\" is defined " "for certificate \"%V\" and " "the \"%s\" directive in %s:%ui", ((ngx_str_t *) conf->certificates->elts) + conf->certificates->nelts - 1, mode, conf->file, conf->line); return NGX_CONF_ERROR; } if (ngx_ssl_create(&conf->ssl, conf->protocols, NULL) != NGX_OK) { return NGX_CONF_ERROR; } cln = ngx_pool_cleanup_add(cf->pool, 0); if (cln == NULL) { ngx_ssl_cleanup_ctx(&conf->ssl); return NGX_CONF_ERROR; } cln->handler = ngx_ssl_cleanup_ctx; cln->data = &conf->ssl; #ifdef TLSEXT_TYPE_application_layer_protocol_negotiation SSL_CTX_set_alpn_select_cb(conf->ssl.ctx, ngx_mail_ssl_alpn_select, NULL); #endif if (ngx_ssl_ciphers(cf, &conf->ssl, &conf->ciphers, conf->prefer_server_ciphers) != NGX_OK) { return NGX_CONF_ERROR; } if (ngx_ssl_certificates(cf, &conf->ssl, conf->certificates, conf->certificate_keys, conf->passwords) != NGX_OK) { return NGX_CONF_ERROR; } if (conf->verify) { if (conf->client_certificate.len == 0 && conf->verify != 3) { ngx_log_error(NGX_LOG_EMERG, cf->log, 0, "no ssl_client_certificate for ssl_verify_client"); return NGX_CONF_ERROR; } if (ngx_ssl_client_certificate(cf, &conf->ssl, &conf->client_certificate, conf->verify_depth) != NGX_OK) { return NGX_CONF_ERROR; } if (ngx_ssl_trusted_certificate(cf, &conf->ssl, &conf->trusted_certificate, conf->verify_depth) != NGX_OK) { return NGX_CONF_ERROR; } if (ngx_ssl_crl(cf, &conf->ssl, &conf->crl) != NGX_OK) { return NGX_CONF_ERROR; } } 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; } ngx_conf_merge_value(conf->builtin_session_cache, prev->builtin_session_cache, NGX_SSL_NONE_SCACHE); if (conf->shm_zone == NULL) { conf->shm_zone = prev->shm_zone; } if (ngx_ssl_session_cache(&conf->ssl, &ngx_mail_ssl_sess_id_ctx, conf->certificates, conf->builtin_session_cache, conf->shm_zone, conf->session_timeout) != NGX_OK) { 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); if (ngx_ssl_session_ticket_keys(cf, &conf->ssl, conf->session_ticket_keys) != NGX_OK) { return NGX_CONF_ERROR; } if (ngx_ssl_conf_commands(cf, &conf->ssl, conf->conf_commands) != NGX_OK) { return NGX_CONF_ERROR; } return NGX_CONF_OK; } static char * ngx_mail_ssl_enable(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_mail_ssl_conf_t *scf = conf; char *rv; rv = ngx_conf_set_flag_slot(cf, cmd, conf); if (rv != NGX_CONF_OK) { return rv; } if (scf->enable && (ngx_int_t) scf->starttls > NGX_MAIL_STARTTLS_OFF) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "\"starttls\" directive conflicts with \"ssl on\""); return NGX_CONF_ERROR; } if (!scf->listen) { scf->file = cf->conf_file->file.name.data; scf->line = cf->conf_file->line; } return NGX_CONF_OK; } static char * ngx_mail_ssl_starttls(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_mail_ssl_conf_t *scf = conf; char *rv; rv = ngx_conf_set_enum_slot(cf, cmd, conf); if (rv != NGX_CONF_OK) { return rv; } if (scf->enable == 1 && (ngx_int_t) scf->starttls > NGX_MAIL_STARTTLS_OFF) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "\"ssl\" directive conflicts with \"starttls\""); return NGX_CONF_ERROR; } if (!scf->listen) { scf->file = cf->conf_file->file.name.data; scf->line = cf->conf_file->line; } return NGX_CONF_OK; } static char * ngx_mail_ssl_password_file(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_mail_ssl_conf_t *scf = conf; ngx_str_t *value; if (scf->passwords != NGX_CONF_UNSET_PTR) { return "is duplicate"; } value = cf->args->elts; scf->passwords = ngx_ssl_read_password_file(cf, &value[1]); if (scf->passwords == NULL) { return NGX_CONF_ERROR; } return NGX_CONF_OK; } static char * ngx_mail_ssl_session_cache(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_mail_ssl_conf_t *scf = conf; size_t len; ngx_str_t *value, name, size; ngx_int_t n; ngx_uint_t i, j; value = cf->args->elts; for (i = 1; i < cf->args->nelts; i++) { if (ngx_strcmp(value[i].data, "off") == 0) { scf->builtin_session_cache = NGX_SSL_NO_SCACHE; continue; } if (ngx_strcmp(value[i].data, "none") == 0) { scf->builtin_session_cache = NGX_SSL_NONE_SCACHE; continue; } if (ngx_strcmp(value[i].data, "builtin") == 0) { scf->builtin_session_cache = NGX_SSL_DFLT_BUILTIN_SCACHE; continue; } if (value[i].len > sizeof("builtin:") - 1 && ngx_strncmp(value[i].data, "builtin:", sizeof("builtin:") - 1) == 0) { n = ngx_atoi(value[i].data + sizeof("builtin:") - 1, value[i].len - (sizeof("builtin:") - 1)); if (n == NGX_ERROR) { goto invalid; } scf->builtin_session_cache = n; continue; } if (value[i].len > sizeof("shared:") - 1 && ngx_strncmp(value[i].data, "shared:", sizeof("shared:") - 1) == 0) { len = 0; for (j = sizeof("shared:") - 1; j < value[i].len; j++) { if (value[i].data[j] == ':') { break; } len++; } if (len == 0 || j == value[i].len) { goto invalid; } name.len = len; name.data = value[i].data + sizeof("shared:") - 1; size.len = value[i].len - j - 1; size.data = name.data + len + 1; n = ngx_parse_size(&size); if (n == NGX_ERROR) { goto invalid; } if (n < (ngx_int_t) (8 * ngx_pagesize)) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "session cache \"%V\" is too small", &value[i]); return NGX_CONF_ERROR; } scf->shm_zone = ngx_shared_memory_add(cf, &name, n, &ngx_mail_ssl_module); if (scf->shm_zone == NULL) { return NGX_CONF_ERROR; } scf->shm_zone->init = ngx_ssl_session_cache_init; continue; } goto invalid; } if (scf->shm_zone && scf->builtin_session_cache == NGX_CONF_UNSET) { scf->builtin_session_cache = NGX_SSL_NO_BUILTIN_SCACHE; } return NGX_CONF_OK; invalid: ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid session cache \"%V\"", &value[i]); return NGX_CONF_ERROR; } static char * ngx_mail_ssl_conf_command_check(ngx_conf_t *cf, void *post, void *data) { #ifndef SSL_CONF_FLAG_FILE return "is not supported on this platform"; #else return NGX_CONF_OK; #endif }