Mercurial > hg > nginx-quic
view src/stream/ngx_stream_limit_conn_module.c @ 6982:ac9b1df5b246
SSL: disabled renegotiation detection in client mode.
CVE-2009-3555 is no longer relevant and mitigated by the renegotiation
info extension (secure renegotiation). On the other hand, unexpected
renegotiation still introduces potential security risks, and hence we do
not allow renegotiation on the server side, as we never request renegotiation.
On the client side the situation is different though. There are backends
which explicitly request renegotiation, and disabled renegotiation
introduces interoperability problems. This change allows renegotiation
on the client side, and fixes interoperability problems as observed with
such backends (ticket #872).
Additionally, with TLSv1.3 the SSL_CB_HANDSHAKE_START flag is currently set
by OpenSSL when receiving a NewSessionTicket message, and was detected by
nginx as a renegotiation attempt. This looks like a bug in OpenSSL, though
this change also allows better interoperability till the problem is fixed.
author | Sergey Kandaurov <pluknet@nginx.com> |
---|---|
date | Tue, 18 Apr 2017 16:08:44 +0300 |
parents | 3908156a51fa |
children | 359b0ea2b067 |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_stream.h> typedef struct { u_char color; u_char len; u_short conn; u_char data[1]; } ngx_stream_limit_conn_node_t; typedef struct { ngx_shm_zone_t *shm_zone; ngx_rbtree_node_t *node; } ngx_stream_limit_conn_cleanup_t; typedef struct { ngx_rbtree_t *rbtree; ngx_stream_complex_value_t key; } ngx_stream_limit_conn_ctx_t; typedef struct { ngx_shm_zone_t *shm_zone; ngx_uint_t conn; } ngx_stream_limit_conn_limit_t; typedef struct { ngx_array_t limits; ngx_uint_t log_level; } ngx_stream_limit_conn_conf_t; static ngx_rbtree_node_t *ngx_stream_limit_conn_lookup(ngx_rbtree_t *rbtree, ngx_str_t *key, uint32_t hash); static void ngx_stream_limit_conn_cleanup(void *data); static ngx_inline void ngx_stream_limit_conn_cleanup_all(ngx_pool_t *pool); static void *ngx_stream_limit_conn_create_conf(ngx_conf_t *cf); static char *ngx_stream_limit_conn_merge_conf(ngx_conf_t *cf, void *parent, void *child); static char *ngx_stream_limit_conn_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static char *ngx_stream_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static ngx_int_t ngx_stream_limit_conn_init(ngx_conf_t *cf); static ngx_conf_enum_t ngx_stream_limit_conn_log_levels[] = { { ngx_string("info"), NGX_LOG_INFO }, { ngx_string("notice"), NGX_LOG_NOTICE }, { ngx_string("warn"), NGX_LOG_WARN }, { ngx_string("error"), NGX_LOG_ERR }, { ngx_null_string, 0 } }; static ngx_command_t ngx_stream_limit_conn_commands[] = { { ngx_string("limit_conn_zone"), NGX_STREAM_MAIN_CONF|NGX_CONF_TAKE2, ngx_stream_limit_conn_zone, 0, 0, NULL }, { ngx_string("limit_conn"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE2, ngx_stream_limit_conn, NGX_STREAM_SRV_CONF_OFFSET, 0, NULL }, { ngx_string("limit_conn_log_level"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_enum_slot, NGX_STREAM_SRV_CONF_OFFSET, offsetof(ngx_stream_limit_conn_conf_t, log_level), &ngx_stream_limit_conn_log_levels }, ngx_null_command }; static ngx_stream_module_t ngx_stream_limit_conn_module_ctx = { NULL, /* preconfiguration */ ngx_stream_limit_conn_init, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ ngx_stream_limit_conn_create_conf, /* create server configuration */ ngx_stream_limit_conn_merge_conf /* merge server configuration */ }; ngx_module_t ngx_stream_limit_conn_module = { NGX_MODULE_V1, &ngx_stream_limit_conn_module_ctx, /* module context */ ngx_stream_limit_conn_commands, /* module directives */ NGX_STREAM_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_int_t ngx_stream_limit_conn_handler(ngx_stream_session_t *s) { size_t n; uint32_t hash; ngx_str_t key; ngx_uint_t i; ngx_slab_pool_t *shpool; ngx_rbtree_node_t *node; ngx_pool_cleanup_t *cln; ngx_stream_limit_conn_ctx_t *ctx; ngx_stream_limit_conn_node_t *lc; ngx_stream_limit_conn_conf_t *lccf; ngx_stream_limit_conn_limit_t *limits; ngx_stream_limit_conn_cleanup_t *lccln; lccf = ngx_stream_get_module_srv_conf(s, ngx_stream_limit_conn_module); limits = lccf->limits.elts; for (i = 0; i < lccf->limits.nelts; i++) { ctx = limits[i].shm_zone->data; if (ngx_stream_complex_value(s, &ctx->key, &key) != NGX_OK) { return NGX_ERROR; } if (key.len == 0) { continue; } if (key.len > 255) { ngx_log_error(NGX_LOG_ERR, s->connection->log, 0, "the value of the \"%V\" key " "is more than 255 bytes: \"%V\"", &ctx->key.value, &key); continue; } hash = ngx_crc32_short(key.data, key.len); shpool = (ngx_slab_pool_t *) limits[i].shm_zone->shm.addr; ngx_shmtx_lock(&shpool->mutex); node = ngx_stream_limit_conn_lookup(ctx->rbtree, &key, hash); if (node == NULL) { n = offsetof(ngx_rbtree_node_t, color) + offsetof(ngx_stream_limit_conn_node_t, data) + key.len; node = ngx_slab_alloc_locked(shpool, n); if (node == NULL) { ngx_shmtx_unlock(&shpool->mutex); ngx_stream_limit_conn_cleanup_all(s->connection->pool); return NGX_STREAM_SERVICE_UNAVAILABLE; } lc = (ngx_stream_limit_conn_node_t *) &node->color; node->key = hash; lc->len = (u_char) key.len; lc->conn = 1; ngx_memcpy(lc->data, key.data, key.len); ngx_rbtree_insert(ctx->rbtree, node); } else { lc = (ngx_stream_limit_conn_node_t *) &node->color; if ((ngx_uint_t) lc->conn >= limits[i].conn) { ngx_shmtx_unlock(&shpool->mutex); ngx_log_error(lccf->log_level, s->connection->log, 0, "limiting connections by zone \"%V\"", &limits[i].shm_zone->shm.name); ngx_stream_limit_conn_cleanup_all(s->connection->pool); return NGX_STREAM_SERVICE_UNAVAILABLE; } lc->conn++; } ngx_log_debug2(NGX_LOG_DEBUG_STREAM, s->connection->log, 0, "limit conn: %08Xi %d", node->key, lc->conn); ngx_shmtx_unlock(&shpool->mutex); cln = ngx_pool_cleanup_add(s->connection->pool, sizeof(ngx_stream_limit_conn_cleanup_t)); if (cln == NULL) { return NGX_ERROR; } cln->handler = ngx_stream_limit_conn_cleanup; lccln = cln->data; lccln->shm_zone = limits[i].shm_zone; lccln->node = node; } return NGX_DECLINED; } static void ngx_stream_limit_conn_rbtree_insert_value(ngx_rbtree_node_t *temp, ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) { ngx_rbtree_node_t **p; ngx_stream_limit_conn_node_t *lcn, *lcnt; for ( ;; ) { if (node->key < temp->key) { p = &temp->left; } else if (node->key > temp->key) { p = &temp->right; } else { /* node->key == temp->key */ lcn = (ngx_stream_limit_conn_node_t *) &node->color; lcnt = (ngx_stream_limit_conn_node_t *) &temp->color; p = (ngx_memn2cmp(lcn->data, lcnt->data, lcn->len, lcnt->len) < 0) ? &temp->left : &temp->right; } if (*p == sentinel) { break; } temp = *p; } *p = node; node->parent = temp; node->left = sentinel; node->right = sentinel; ngx_rbt_red(node); } static ngx_rbtree_node_t * ngx_stream_limit_conn_lookup(ngx_rbtree_t *rbtree, ngx_str_t *key, uint32_t hash) { ngx_int_t rc; ngx_rbtree_node_t *node, *sentinel; ngx_stream_limit_conn_node_t *lcn; node = rbtree->root; sentinel = rbtree->sentinel; while (node != sentinel) { if (hash < node->key) { node = node->left; continue; } if (hash > node->key) { node = node->right; continue; } /* hash == node->key */ lcn = (ngx_stream_limit_conn_node_t *) &node->color; rc = ngx_memn2cmp(key->data, lcn->data, key->len, (size_t) lcn->len); if (rc == 0) { return node; } node = (rc < 0) ? node->left : node->right; } return NULL; } static void ngx_stream_limit_conn_cleanup(void *data) { ngx_stream_limit_conn_cleanup_t *lccln = data; ngx_slab_pool_t *shpool; ngx_rbtree_node_t *node; ngx_stream_limit_conn_ctx_t *ctx; ngx_stream_limit_conn_node_t *lc; ctx = lccln->shm_zone->data; shpool = (ngx_slab_pool_t *) lccln->shm_zone->shm.addr; node = lccln->node; lc = (ngx_stream_limit_conn_node_t *) &node->color; ngx_shmtx_lock(&shpool->mutex); ngx_log_debug2(NGX_LOG_DEBUG_STREAM, lccln->shm_zone->shm.log, 0, "limit conn cleanup: %08Xi %d", node->key, lc->conn); lc->conn--; if (lc->conn == 0) { ngx_rbtree_delete(ctx->rbtree, node); ngx_slab_free_locked(shpool, node); } ngx_shmtx_unlock(&shpool->mutex); } static ngx_inline void ngx_stream_limit_conn_cleanup_all(ngx_pool_t *pool) { ngx_pool_cleanup_t *cln; cln = pool->cleanup; while (cln && cln->handler == ngx_stream_limit_conn_cleanup) { ngx_stream_limit_conn_cleanup(cln->data); cln = cln->next; } pool->cleanup = cln; } static ngx_int_t ngx_stream_limit_conn_init_zone(ngx_shm_zone_t *shm_zone, void *data) { ngx_stream_limit_conn_ctx_t *octx = data; size_t len; ngx_slab_pool_t *shpool; ngx_rbtree_node_t *sentinel; ngx_stream_limit_conn_ctx_t *ctx; ctx = shm_zone->data; if (octx) { if (ctx->key.value.len != octx->key.value.len || ngx_strncmp(ctx->key.value.data, octx->key.value.data, ctx->key.value.len) != 0) { ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, "limit_conn_zone \"%V\" uses the \"%V\" key " "while previously it used the \"%V\" key", &shm_zone->shm.name, &ctx->key.value, &octx->key.value); return NGX_ERROR; } ctx->rbtree = octx->rbtree; return NGX_OK; } shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; if (shm_zone->shm.exists) { ctx->rbtree = shpool->data; return NGX_OK; } ctx->rbtree = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_t)); if (ctx->rbtree == NULL) { return NGX_ERROR; } shpool->data = ctx->rbtree; sentinel = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_node_t)); if (sentinel == NULL) { return NGX_ERROR; } ngx_rbtree_init(ctx->rbtree, sentinel, ngx_stream_limit_conn_rbtree_insert_value); len = sizeof(" in limit_conn_zone \"\"") + shm_zone->shm.name.len; shpool->log_ctx = ngx_slab_alloc(shpool, len); if (shpool->log_ctx == NULL) { return NGX_ERROR; } ngx_sprintf(shpool->log_ctx, " in limit_conn_zone \"%V\"%Z", &shm_zone->shm.name); return NGX_OK; } static void * ngx_stream_limit_conn_create_conf(ngx_conf_t *cf) { ngx_stream_limit_conn_conf_t *conf; conf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_limit_conn_conf_t)); if (conf == NULL) { return NULL; } /* * set by ngx_pcalloc(): * * conf->limits.elts = NULL; */ conf->log_level = NGX_CONF_UNSET_UINT; return conf; } static char * ngx_stream_limit_conn_merge_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_stream_limit_conn_conf_t *prev = parent; ngx_stream_limit_conn_conf_t *conf = child; if (conf->limits.elts == NULL) { conf->limits = prev->limits; } ngx_conf_merge_uint_value(conf->log_level, prev->log_level, NGX_LOG_ERR); return NGX_CONF_OK; } static char * ngx_stream_limit_conn_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { u_char *p; ssize_t size; ngx_str_t *value, name, s; ngx_uint_t i; ngx_shm_zone_t *shm_zone; ngx_stream_limit_conn_ctx_t *ctx; ngx_stream_compile_complex_value_t ccv; value = cf->args->elts; ctx = ngx_pcalloc(cf->pool, sizeof(ngx_stream_limit_conn_ctx_t)); if (ctx == NULL) { return NGX_CONF_ERROR; } ngx_memzero(&ccv, sizeof(ngx_stream_compile_complex_value_t)); ccv.cf = cf; ccv.value = &value[1]; ccv.complex_value = &ctx->key; if (ngx_stream_compile_complex_value(&ccv) != NGX_OK) { return NGX_CONF_ERROR; } size = 0; name.len = 0; for (i = 2; i < cf->args->nelts; i++) { if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { name.data = value[i].data + 5; p = (u_char *) ngx_strchr(name.data, ':'); if (p == NULL) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid zone size \"%V\"", &value[i]); return NGX_CONF_ERROR; } name.len = p - name.data; s.data = p + 1; s.len = value[i].data + value[i].len - s.data; size = ngx_parse_size(&s); if (size == NGX_ERROR) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid zone size \"%V\"", &value[i]); return NGX_CONF_ERROR; } if (size < (ssize_t) (8 * ngx_pagesize)) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "zone \"%V\" is too small", &value[i]); return NGX_CONF_ERROR; } continue; } ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", &value[i]); return NGX_CONF_ERROR; } if (name.len == 0) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "\"%V\" must have \"zone\" parameter", &cmd->name); return NGX_CONF_ERROR; } shm_zone = ngx_shared_memory_add(cf, &name, size, &ngx_stream_limit_conn_module); if (shm_zone == NULL) { return NGX_CONF_ERROR; } if (shm_zone->data) { ctx = shm_zone->data; ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%V \"%V\" is already bound to key \"%V\"", &cmd->name, &name, &ctx->key.value); return NGX_CONF_ERROR; } shm_zone->init = ngx_stream_limit_conn_init_zone; shm_zone->data = ctx; return NGX_CONF_OK; } static char * ngx_stream_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_shm_zone_t *shm_zone; ngx_stream_limit_conn_conf_t *lccf = conf; ngx_stream_limit_conn_limit_t *limit, *limits; ngx_str_t *value; ngx_int_t n; ngx_uint_t i; value = cf->args->elts; shm_zone = ngx_shared_memory_add(cf, &value[1], 0, &ngx_stream_limit_conn_module); if (shm_zone == NULL) { return NGX_CONF_ERROR; } limits = lccf->limits.elts; if (limits == NULL) { if (ngx_array_init(&lccf->limits, cf->pool, 1, sizeof(ngx_stream_limit_conn_limit_t)) != NGX_OK) { return NGX_CONF_ERROR; } } for (i = 0; i < lccf->limits.nelts; i++) { if (shm_zone == limits[i].shm_zone) { return "is duplicate"; } } n = ngx_atoi(value[2].data, value[2].len); if (n <= 0) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid number of connections \"%V\"", &value[2]); return NGX_CONF_ERROR; } if (n > 65535) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "connection limit must be less 65536"); return NGX_CONF_ERROR; } limit = ngx_array_push(&lccf->limits); if (limit == NULL) { return NGX_CONF_ERROR; } limit->conn = n; limit->shm_zone = shm_zone; return NGX_CONF_OK; } static ngx_int_t ngx_stream_limit_conn_init(ngx_conf_t *cf) { ngx_stream_handler_pt *h; ngx_stream_core_main_conf_t *cmcf; cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module); h = ngx_array_push(&cmcf->phases[NGX_STREAM_PREACCESS_PHASE].handlers); if (h == NULL) { return NGX_ERROR; } *h = ngx_stream_limit_conn_handler; return NGX_OK; }