Mercurial > hg > nginx-quic
view src/stream/ngx_stream_quic_module.c @ 8551:c35b255d80dc quic
HTTP/3: close connection on keepalive_requests * 2.
After receiving GOAWAY, client is not supposed to create new streams. However,
until client reads this frame, we allow it to create new streams, which are
gracefully rejected. To prevent client from abusing this algorithm, a new
limit is introduced. Upon reaching keepalive_requests * 2, server now closes
the entire QUIC connection claiming excessive load.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Thu, 29 Jul 2021 16:01:37 +0300 |
parents | 8ab0d609af09 |
children | 4b2d259bdadd |
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/* * Copyright (C) Nginx, Inc. * Copyright (C) Roman Arutyunyan */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_stream.h> static ngx_int_t ngx_stream_variable_quic(ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data); static ngx_int_t ngx_stream_quic_add_variables(ngx_conf_t *cf); static void *ngx_stream_quic_create_srv_conf(ngx_conf_t *cf); static char *ngx_stream_quic_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child); static char *ngx_stream_quic_max_ack_delay(ngx_conf_t *cf, void *post, void *data); static char *ngx_stream_quic_max_udp_payload_size(ngx_conf_t *cf, void *post, void *data); static char *ngx_stream_quic_host_key(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static ngx_conf_post_t ngx_stream_quic_max_ack_delay_post = { ngx_stream_quic_max_ack_delay }; static ngx_conf_post_t ngx_stream_quic_max_udp_payload_size_post = { ngx_stream_quic_max_udp_payload_size }; static ngx_conf_num_bounds_t ngx_stream_quic_ack_delay_exponent_bounds = { ngx_conf_check_num_bounds, 0, 20 }; static ngx_conf_num_bounds_t ngx_stream_quic_active_connection_id_limit_bounds = { ngx_conf_check_num_bounds, 2, -1 }; static ngx_command_t ngx_stream_quic_commands[] = { { ngx_string("quic_max_idle_timeout"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_msec_slot, NGX_STREAM_SRV_CONF_OFFSET, offsetof(ngx_quic_conf_t, tp.max_idle_timeout), NULL }, { ngx_string("quic_max_ack_delay"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_msec_slot, NGX_STREAM_SRV_CONF_OFFSET, offsetof(ngx_quic_conf_t, tp.max_ack_delay), &ngx_stream_quic_max_ack_delay_post }, { ngx_string("quic_max_udp_payload_size"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_size_slot, NGX_STREAM_SRV_CONF_OFFSET, offsetof(ngx_quic_conf_t, tp.max_udp_payload_size), &ngx_stream_quic_max_udp_payload_size_post }, { ngx_string("quic_initial_max_data"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_size_slot, NGX_STREAM_SRV_CONF_OFFSET, offsetof(ngx_quic_conf_t, tp.initial_max_data), NULL }, { ngx_string("quic_initial_max_stream_data_bidi_local"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_size_slot, NGX_STREAM_SRV_CONF_OFFSET, offsetof(ngx_quic_conf_t, tp.initial_max_stream_data_bidi_local), NULL }, { ngx_string("quic_initial_max_stream_data_bidi_remote"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_size_slot, NGX_STREAM_SRV_CONF_OFFSET, offsetof(ngx_quic_conf_t, tp.initial_max_stream_data_bidi_remote), NULL }, { ngx_string("quic_initial_max_stream_data_uni"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_size_slot, NGX_STREAM_SRV_CONF_OFFSET, offsetof(ngx_quic_conf_t, tp.initial_max_stream_data_uni), NULL }, { ngx_string("quic_initial_max_streams_bidi"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_num_slot, NGX_STREAM_SRV_CONF_OFFSET, offsetof(ngx_quic_conf_t, tp.initial_max_streams_bidi), NULL }, { ngx_string("quic_initial_max_streams_uni"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_num_slot, NGX_STREAM_SRV_CONF_OFFSET, offsetof(ngx_quic_conf_t, tp.initial_max_streams_uni), NULL }, { ngx_string("quic_ack_delay_exponent"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_num_slot, NGX_STREAM_SRV_CONF_OFFSET, offsetof(ngx_quic_conf_t, tp.ack_delay_exponent), &ngx_stream_quic_ack_delay_exponent_bounds }, { ngx_string("quic_disable_active_migration"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_flag_slot, NGX_STREAM_SRV_CONF_OFFSET, offsetof(ngx_quic_conf_t, tp.disable_active_migration), NULL }, { ngx_string("quic_active_connection_id_limit"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_num_slot, NGX_STREAM_SRV_CONF_OFFSET, offsetof(ngx_quic_conf_t, tp.active_connection_id_limit), &ngx_stream_quic_active_connection_id_limit_bounds }, { ngx_string("quic_retry"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_FLAG, ngx_conf_set_flag_slot, NGX_STREAM_SRV_CONF_OFFSET, offsetof(ngx_quic_conf_t, retry), NULL }, { ngx_string("quic_gso"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_FLAG, ngx_conf_set_flag_slot, NGX_STREAM_SRV_CONF_OFFSET, offsetof(ngx_quic_conf_t, gso_enabled), NULL }, { ngx_string("quic_host_key"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_FLAG, ngx_stream_quic_host_key, NGX_STREAM_SRV_CONF_OFFSET, 0, NULL }, ngx_null_command }; static ngx_stream_module_t ngx_stream_quic_module_ctx = { ngx_stream_quic_add_variables, /* preconfiguration */ NULL, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ ngx_stream_quic_create_srv_conf, /* create server configuration */ ngx_stream_quic_merge_srv_conf, /* merge server configuration */ }; ngx_module_t ngx_stream_quic_module = { NGX_MODULE_V1, &ngx_stream_quic_module_ctx, /* module context */ ngx_stream_quic_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_stream_variable_t ngx_stream_quic_vars[] = { { ngx_string("quic"), NULL, ngx_stream_variable_quic, 0, 0, 0 }, ngx_stream_null_variable }; static ngx_str_t ngx_stream_quic_salt = ngx_string("ngx_quic"); static ngx_int_t ngx_stream_variable_quic(ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data) { if (s->connection->quic) { v->len = 4; v->valid = 1; v->no_cacheable = 1; v->not_found = 0; v->data = (u_char *) "quic"; return NGX_OK; } v->not_found = 1; return NGX_OK; } static ngx_int_t ngx_stream_quic_add_variables(ngx_conf_t *cf) { ngx_stream_variable_t *var, *v; for (v = ngx_stream_quic_vars; v->name.len; v++) { var = ngx_stream_add_variable(cf, &v->name, v->flags); if (var == NULL) { return NGX_ERROR; } var->get_handler = v->get_handler; var->data = v->data; } return NGX_OK; } static void * ngx_stream_quic_create_srv_conf(ngx_conf_t *cf) { ngx_quic_conf_t *conf; conf = ngx_pcalloc(cf->pool, sizeof(ngx_quic_conf_t)); if (conf == NULL) { return NULL; } /* * set by ngx_pcalloc(): * * conf->tp.original_dcid = { 0, NULL }; * conf->tp.initial_scid = { 0, NULL }; * conf->tp.retry_scid = { 0, NULL }; * conf->tp.preferred_address = NULL * conf->host_key = { 0, NULL } * conf->require_alpn = 0; */ conf->tp.max_idle_timeout = NGX_CONF_UNSET_MSEC; conf->tp.max_ack_delay = NGX_CONF_UNSET_MSEC; conf->tp.max_udp_payload_size = NGX_CONF_UNSET_SIZE; conf->tp.initial_max_data = NGX_CONF_UNSET_SIZE; conf->tp.initial_max_stream_data_bidi_local = NGX_CONF_UNSET_SIZE; conf->tp.initial_max_stream_data_bidi_remote = NGX_CONF_UNSET_SIZE; conf->tp.initial_max_stream_data_uni = NGX_CONF_UNSET_SIZE; conf->tp.initial_max_streams_bidi = NGX_CONF_UNSET_UINT; conf->tp.initial_max_streams_uni = NGX_CONF_UNSET_UINT; conf->tp.ack_delay_exponent = NGX_CONF_UNSET_UINT; conf->tp.disable_active_migration = NGX_CONF_UNSET; conf->tp.active_connection_id_limit = NGX_CONF_UNSET_UINT; conf->retry = NGX_CONF_UNSET; conf->gso_enabled = NGX_CONF_UNSET; return conf; } static char * ngx_stream_quic_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_quic_conf_t *prev = parent; ngx_quic_conf_t *conf = child; ngx_stream_ssl_conf_t *scf; ngx_conf_merge_msec_value(conf->tp.max_idle_timeout, prev->tp.max_idle_timeout, 60000); ngx_conf_merge_msec_value(conf->tp.max_ack_delay, prev->tp.max_ack_delay, NGX_QUIC_DEFAULT_MAX_ACK_DELAY); ngx_conf_merge_size_value(conf->tp.max_udp_payload_size, prev->tp.max_udp_payload_size, NGX_QUIC_MAX_UDP_PAYLOAD_SIZE); ngx_conf_merge_size_value(conf->tp.initial_max_data, prev->tp.initial_max_data, 16 * NGX_QUIC_STREAM_BUFSIZE); ngx_conf_merge_size_value(conf->tp.initial_max_stream_data_bidi_local, prev->tp.initial_max_stream_data_bidi_local, NGX_QUIC_STREAM_BUFSIZE); ngx_conf_merge_size_value(conf->tp.initial_max_stream_data_bidi_remote, prev->tp.initial_max_stream_data_bidi_remote, NGX_QUIC_STREAM_BUFSIZE); ngx_conf_merge_size_value(conf->tp.initial_max_stream_data_uni, prev->tp.initial_max_stream_data_uni, NGX_QUIC_STREAM_BUFSIZE); ngx_conf_merge_uint_value(conf->tp.initial_max_streams_bidi, prev->tp.initial_max_streams_bidi, 16); ngx_conf_merge_uint_value(conf->tp.initial_max_streams_uni, prev->tp.initial_max_streams_uni, 16); ngx_conf_merge_uint_value(conf->tp.ack_delay_exponent, prev->tp.ack_delay_exponent, NGX_QUIC_DEFAULT_ACK_DELAY_EXPONENT); ngx_conf_merge_value(conf->tp.disable_active_migration, prev->tp.disable_active_migration, 0); ngx_conf_merge_uint_value(conf->tp.active_connection_id_limit, prev->tp.active_connection_id_limit, 2); ngx_conf_merge_value(conf->retry, prev->retry, 0); ngx_conf_merge_value(conf->gso_enabled, prev->gso_enabled, 0); ngx_conf_merge_str_value(conf->host_key, prev->host_key, ""); if (conf->host_key.len == 0) { conf->host_key.len = NGX_QUIC_DEFAULT_HOST_KEY_LEN; conf->host_key.data = ngx_palloc(cf->pool, conf->host_key.len); if (conf->host_key.data == NULL) { return NGX_CONF_ERROR; } if (RAND_bytes(conf->host_key.data, NGX_QUIC_DEFAULT_HOST_KEY_LEN) <= 0) { return NGX_CONF_ERROR; } } if (ngx_quic_derive_key(cf->log, "av_token_key", &conf->host_key, &ngx_stream_quic_salt, conf->av_token_key, NGX_QUIC_AV_KEY_LEN) != NGX_OK) { return NGX_CONF_ERROR; } if (ngx_quic_derive_key(cf->log, "sr_token_key", &conf->host_key, &ngx_stream_quic_salt, conf->sr_token_key, NGX_QUIC_SR_KEY_LEN) != NGX_OK) { return NGX_CONF_ERROR; } scf = ngx_stream_conf_get_module_srv_conf(cf, ngx_stream_ssl_module); conf->ssl = &scf->ssl; return NGX_CONF_OK; } static char * ngx_stream_quic_max_ack_delay(ngx_conf_t *cf, void *post, void *data) { ngx_msec_t *sp = data; if (*sp >= 16384) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "\"quic_max_ack_delay\" must be less than 16384"); return NGX_CONF_ERROR; } return NGX_CONF_OK; } static char * ngx_stream_quic_max_udp_payload_size(ngx_conf_t *cf, void *post, void *data) { size_t *sp = data; if (*sp < NGX_QUIC_MIN_INITIAL_SIZE || *sp > NGX_QUIC_MAX_UDP_PAYLOAD_SIZE) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "\"quic_max_udp_payload_size\" must be between " "%d and %d", NGX_QUIC_MIN_INITIAL_SIZE, NGX_QUIC_MAX_UDP_PAYLOAD_SIZE); return NGX_CONF_ERROR; } return NGX_CONF_OK; } static char * ngx_stream_quic_host_key(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_quic_conf_t *qcf = conf; u_char *buf; size_t size; ssize_t n; ngx_str_t *value; ngx_file_t file; ngx_file_info_t fi; if (qcf->host_key.len) { return "is duplicate"; } buf = NULL; #if (NGX_SUPPRESS_WARN) size = 0; #endif value = cf->args->elts; if (ngx_conf_full_name(cf->cycle, &value[1], 1) != NGX_OK) { return NGX_CONF_ERROR; } ngx_memzero(&file, sizeof(ngx_file_t)); file.name = value[1]; file.log = cf->log; file.fd = ngx_open_file(file.name.data, NGX_FILE_RDONLY, NGX_FILE_OPEN, 0); if (file.fd == NGX_INVALID_FILE) { ngx_conf_log_error(NGX_LOG_EMERG, cf, ngx_errno, ngx_open_file_n " \"%V\" failed", &file.name); return NGX_CONF_ERROR; } if (ngx_fd_info(file.fd, &fi) == NGX_FILE_ERROR) { ngx_conf_log_error(NGX_LOG_CRIT, cf, ngx_errno, ngx_fd_info_n " \"%V\" failed", &file.name); goto failed; } size = ngx_file_size(&fi); if (size == 0) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "\"%V\" zero key size", &file.name); goto failed; } buf = ngx_pnalloc(cf->pool, size); if (buf == NULL) { goto failed; } n = ngx_read_file(&file, buf, size, 0); if (n == NGX_ERROR) { ngx_conf_log_error(NGX_LOG_CRIT, cf, ngx_errno, ngx_read_file_n " \"%V\" failed", &file.name); goto failed; } if ((size_t) n != size) { ngx_conf_log_error(NGX_LOG_CRIT, cf, 0, ngx_read_file_n " \"%V\" returned only " "%z bytes instead of %uz", &file.name, n, size); goto failed; } qcf->host_key.data = buf; qcf->host_key.len = n; if (ngx_close_file(file.fd) == NGX_FILE_ERROR) { ngx_log_error(NGX_LOG_ALERT, cf->log, ngx_errno, ngx_close_file_n " \"%V\" failed", &file.name); } return NGX_CONF_OK; failed: if (ngx_close_file(file.fd) == NGX_FILE_ERROR) { ngx_log_error(NGX_LOG_ALERT, cf->log, ngx_errno, ngx_close_file_n " \"%V\" failed", &file.name); } if (buf) { ngx_explicit_memzero(buf, size); } return NGX_CONF_ERROR; }