Mercurial > hg > nginx
view src/stream/ngx_stream_map_module.c @ 9275:199dc0d6b05b
Added max_headers directive.
The directive limits the number of request headers accepted from clients.
While the total amount of headers is believed to be sufficiently limited
by the existing buffer size limits (client_header_buffer_size and
large_client_header_buffers), the additional limit on the number of headers
might be beneficial to better protect backend servers.
Requested by Maksim Yevmenkin.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Fri, 24 May 2024 00:20:01 +0300 |
parents | ec10ce307dc0 |
children |
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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 { ngx_uint_t hash_max_size; ngx_uint_t hash_bucket_size; } ngx_stream_map_conf_t; typedef struct { ngx_hash_keys_arrays_t keys; ngx_array_t *values_hash; #if (NGX_PCRE) ngx_array_t regexes; #endif ngx_stream_variable_value_t *default_value; ngx_conf_t *cf; unsigned hostnames:1; unsigned no_cacheable:1; } ngx_stream_map_conf_ctx_t; typedef struct { ngx_stream_map_t map; ngx_stream_complex_value_t value; ngx_stream_variable_value_t *default_value; ngx_uint_t hostnames; /* unsigned hostnames:1 */ } ngx_stream_map_ctx_t; static int ngx_libc_cdecl ngx_stream_map_cmp_dns_wildcards(const void *one, const void *two); static void *ngx_stream_map_create_conf(ngx_conf_t *cf); static char *ngx_stream_map_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static char *ngx_stream_map(ngx_conf_t *cf, ngx_command_t *dummy, void *conf); static ngx_command_t ngx_stream_map_commands[] = { { ngx_string("map"), NGX_STREAM_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE2, ngx_stream_map_block, NGX_STREAM_MAIN_CONF_OFFSET, 0, NULL }, { ngx_string("map_hash_max_size"), NGX_STREAM_MAIN_CONF|NGX_CONF_TAKE1, ngx_conf_set_num_slot, NGX_STREAM_MAIN_CONF_OFFSET, offsetof(ngx_stream_map_conf_t, hash_max_size), NULL }, { ngx_string("map_hash_bucket_size"), NGX_STREAM_MAIN_CONF|NGX_CONF_TAKE1, ngx_conf_set_num_slot, NGX_STREAM_MAIN_CONF_OFFSET, offsetof(ngx_stream_map_conf_t, hash_bucket_size), NULL }, ngx_null_command }; static ngx_stream_module_t ngx_stream_map_module_ctx = { NULL, /* preconfiguration */ NULL, /* postconfiguration */ ngx_stream_map_create_conf, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL /* merge server configuration */ }; ngx_module_t ngx_stream_map_module = { NGX_MODULE_V1, &ngx_stream_map_module_ctx, /* module context */ ngx_stream_map_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_map_variable(ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data) { ngx_stream_map_ctx_t *map = (ngx_stream_map_ctx_t *) data; ngx_str_t val, str; ngx_stream_complex_value_t *cv; ngx_stream_variable_value_t *value; ngx_log_debug0(NGX_LOG_DEBUG_STREAM, s->connection->log, 0, "stream map started"); if (ngx_stream_complex_value(s, &map->value, &val) != NGX_OK) { return NGX_ERROR; } if (map->hostnames && val.len > 0 && val.data[val.len - 1] == '.') { val.len--; } value = ngx_stream_map_find(s, &map->map, &val); if (value == NULL) { value = map->default_value; } if (!value->valid) { cv = (ngx_stream_complex_value_t *) value->data; if (ngx_stream_complex_value(s, cv, &str) != NGX_OK) { return NGX_ERROR; } v->valid = 1; v->no_cacheable = 0; v->not_found = 0; v->len = str.len; v->data = str.data; } else { *v = *value; } ngx_log_debug2(NGX_LOG_DEBUG_STREAM, s->connection->log, 0, "stream map: \"%V\" \"%v\"", &val, v); return NGX_OK; } static void * ngx_stream_map_create_conf(ngx_conf_t *cf) { ngx_stream_map_conf_t *mcf; mcf = ngx_palloc(cf->pool, sizeof(ngx_stream_map_conf_t)); if (mcf == NULL) { return NULL; } mcf->hash_max_size = NGX_CONF_UNSET_UINT; mcf->hash_bucket_size = NGX_CONF_UNSET_UINT; return mcf; } static char * ngx_stream_map_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_stream_map_conf_t *mcf = conf; char *rv; ngx_str_t *value, name; ngx_conf_t save; ngx_pool_t *pool; ngx_hash_init_t hash; ngx_stream_map_ctx_t *map; ngx_stream_variable_t *var; ngx_stream_map_conf_ctx_t ctx; ngx_stream_compile_complex_value_t ccv; if (mcf->hash_max_size == NGX_CONF_UNSET_UINT) { mcf->hash_max_size = 2048; } if (mcf->hash_bucket_size == NGX_CONF_UNSET_UINT) { mcf->hash_bucket_size = ngx_cacheline_size; } else { mcf->hash_bucket_size = ngx_align(mcf->hash_bucket_size, ngx_cacheline_size); } map = ngx_pcalloc(cf->pool, sizeof(ngx_stream_map_ctx_t)); if (map == NULL) { return NGX_CONF_ERROR; } value = cf->args->elts; ngx_memzero(&ccv, sizeof(ngx_stream_compile_complex_value_t)); ccv.cf = cf; ccv.value = &value[1]; ccv.complex_value = &map->value; if (ngx_stream_compile_complex_value(&ccv) != NGX_OK) { return NGX_CONF_ERROR; } name = value[2]; if (name.data[0] != '$') { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid variable name \"%V\"", &name); return NGX_CONF_ERROR; } name.len--; name.data++; var = ngx_stream_add_variable(cf, &name, NGX_STREAM_VAR_CHANGEABLE); if (var == NULL) { return NGX_CONF_ERROR; } var->get_handler = ngx_stream_map_variable; var->data = (uintptr_t) map; pool = ngx_create_pool(NGX_DEFAULT_POOL_SIZE, cf->log); if (pool == NULL) { return NGX_CONF_ERROR; } ctx.keys.pool = cf->pool; ctx.keys.temp_pool = pool; if (ngx_hash_keys_array_init(&ctx.keys, NGX_HASH_LARGE) != NGX_OK) { ngx_destroy_pool(pool); return NGX_CONF_ERROR; } ctx.values_hash = ngx_pcalloc(pool, sizeof(ngx_array_t) * ctx.keys.hsize); if (ctx.values_hash == NULL) { ngx_destroy_pool(pool); return NGX_CONF_ERROR; } #if (NGX_PCRE) if (ngx_array_init(&ctx.regexes, cf->pool, 2, sizeof(ngx_stream_map_regex_t)) != NGX_OK) { ngx_destroy_pool(pool); return NGX_CONF_ERROR; } #endif ctx.default_value = NULL; ctx.cf = &save; ctx.hostnames = 0; ctx.no_cacheable = 0; save = *cf; cf->pool = pool; cf->ctx = &ctx; cf->handler = ngx_stream_map; cf->handler_conf = conf; rv = ngx_conf_parse(cf, NULL); *cf = save; if (rv != NGX_CONF_OK) { ngx_destroy_pool(pool); return rv; } if (ctx.no_cacheable) { var->flags |= NGX_STREAM_VAR_NOCACHEABLE; } map->default_value = ctx.default_value ? ctx.default_value: &ngx_stream_variable_null_value; map->hostnames = ctx.hostnames; hash.key = ngx_hash_key_lc; hash.max_size = mcf->hash_max_size; hash.bucket_size = mcf->hash_bucket_size; hash.name = "map_hash"; hash.pool = cf->pool; if (ctx.keys.keys.nelts) { hash.hash = &map->map.hash.hash; hash.temp_pool = NULL; if (ngx_hash_init(&hash, ctx.keys.keys.elts, ctx.keys.keys.nelts) != NGX_OK) { ngx_destroy_pool(pool); return NGX_CONF_ERROR; } } if (ctx.keys.dns_wc_head.nelts) { ngx_qsort(ctx.keys.dns_wc_head.elts, (size_t) ctx.keys.dns_wc_head.nelts, sizeof(ngx_hash_key_t), ngx_stream_map_cmp_dns_wildcards); hash.hash = NULL; hash.temp_pool = pool; if (ngx_hash_wildcard_init(&hash, ctx.keys.dns_wc_head.elts, ctx.keys.dns_wc_head.nelts) != NGX_OK) { ngx_destroy_pool(pool); return NGX_CONF_ERROR; } map->map.hash.wc_head = (ngx_hash_wildcard_t *) hash.hash; } if (ctx.keys.dns_wc_tail.nelts) { ngx_qsort(ctx.keys.dns_wc_tail.elts, (size_t) ctx.keys.dns_wc_tail.nelts, sizeof(ngx_hash_key_t), ngx_stream_map_cmp_dns_wildcards); hash.hash = NULL; hash.temp_pool = pool; if (ngx_hash_wildcard_init(&hash, ctx.keys.dns_wc_tail.elts, ctx.keys.dns_wc_tail.nelts) != NGX_OK) { ngx_destroy_pool(pool); return NGX_CONF_ERROR; } map->map.hash.wc_tail = (ngx_hash_wildcard_t *) hash.hash; } #if (NGX_PCRE) if (ctx.regexes.nelts) { map->map.regex = ctx.regexes.elts; map->map.nregex = ctx.regexes.nelts; } #endif ngx_destroy_pool(pool); return rv; } static int ngx_libc_cdecl ngx_stream_map_cmp_dns_wildcards(const void *one, const void *two) { ngx_hash_key_t *first, *second; first = (ngx_hash_key_t *) one; second = (ngx_hash_key_t *) two; return ngx_dns_strcmp(first->key.data, second->key.data); } static char * ngx_stream_map(ngx_conf_t *cf, ngx_command_t *dummy, void *conf) { u_char *data; size_t len; ngx_int_t rv; ngx_str_t *value, v; ngx_uint_t i, key; ngx_stream_map_conf_ctx_t *ctx; ngx_stream_complex_value_t cv, *cvp; ngx_stream_variable_value_t *var, **vp; ngx_stream_compile_complex_value_t ccv; ctx = cf->ctx; value = cf->args->elts; if (cf->args->nelts == 1 && ngx_strcmp(value[0].data, "hostnames") == 0) { ctx->hostnames = 1; return NGX_CONF_OK; } if (cf->args->nelts == 1 && ngx_strcmp(value[0].data, "volatile") == 0) { ctx->no_cacheable = 1; return NGX_CONF_OK; } if (cf->args->nelts != 2) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid number of the map parameters"); return NGX_CONF_ERROR; } if (ngx_strcmp(value[0].data, "include") == 0) { return ngx_conf_include(cf, dummy, conf); } key = 0; for (i = 0; i < value[1].len; i++) { key = ngx_hash(key, value[1].data[i]); } key %= ctx->keys.hsize; vp = ctx->values_hash[key].elts; if (vp) { for (i = 0; i < ctx->values_hash[key].nelts; i++) { if (vp[i]->valid) { data = vp[i]->data; len = vp[i]->len; } else { cvp = (ngx_stream_complex_value_t *) vp[i]->data; data = cvp->value.data; len = cvp->value.len; } if (value[1].len != len) { continue; } if (ngx_strncmp(value[1].data, data, len) == 0) { var = vp[i]; goto found; } } } else { if (ngx_array_init(&ctx->values_hash[key], cf->pool, 4, sizeof(ngx_stream_variable_value_t *)) != NGX_OK) { return NGX_CONF_ERROR; } } var = ngx_palloc(ctx->keys.pool, sizeof(ngx_stream_variable_value_t)); if (var == NULL) { return NGX_CONF_ERROR; } v.len = value[1].len; v.data = ngx_pstrdup(ctx->keys.pool, &value[1]); if (v.data == NULL) { return NGX_CONF_ERROR; } ngx_memzero(&ccv, sizeof(ngx_stream_compile_complex_value_t)); ccv.cf = ctx->cf; ccv.value = &v; ccv.complex_value = &cv; if (ngx_stream_compile_complex_value(&ccv) != NGX_OK) { return NGX_CONF_ERROR; } if (cv.lengths != NULL) { cvp = ngx_palloc(ctx->keys.pool, sizeof(ngx_stream_complex_value_t)); if (cvp == NULL) { return NGX_CONF_ERROR; } *cvp = cv; var->len = 0; var->data = (u_char *) cvp; var->valid = 0; } else { var->len = v.len; var->data = v.data; var->valid = 1; } var->no_cacheable = 0; var->not_found = 0; vp = ngx_array_push(&ctx->values_hash[key]); if (vp == NULL) { return NGX_CONF_ERROR; } *vp = var; found: if (ngx_strcmp(value[0].data, "default") == 0) { if (ctx->default_value) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "duplicate default map parameter"); return NGX_CONF_ERROR; } ctx->default_value = var; return NGX_CONF_OK; } #if (NGX_PCRE) if (value[0].len && value[0].data[0] == '~') { ngx_regex_compile_t rc; ngx_stream_map_regex_t *regex; u_char errstr[NGX_MAX_CONF_ERRSTR]; regex = ngx_array_push(&ctx->regexes); if (regex == NULL) { return NGX_CONF_ERROR; } value[0].len--; value[0].data++; ngx_memzero(&rc, sizeof(ngx_regex_compile_t)); if (value[0].data[0] == '*') { value[0].len--; value[0].data++; rc.options = NGX_REGEX_CASELESS; } rc.pattern = value[0]; rc.err.len = NGX_MAX_CONF_ERRSTR; rc.err.data = errstr; regex->regex = ngx_stream_regex_compile(ctx->cf, &rc); if (regex->regex == NULL) { return NGX_CONF_ERROR; } regex->value = var; return NGX_CONF_OK; } #endif if (value[0].len && value[0].data[0] == '\\') { value[0].len--; value[0].data++; } rv = ngx_hash_add_key(&ctx->keys, &value[0], var, (ctx->hostnames) ? NGX_HASH_WILDCARD_KEY : 0); if (rv == NGX_OK) { return NGX_CONF_OK; } if (rv == NGX_DECLINED) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid hostname or wildcard \"%V\"", &value[0]); } if (rv == NGX_BUSY) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "conflicting parameter \"%V\"", &value[0]); } return NGX_CONF_ERROR; }