view src/http/v3/ngx_http_v3_module.c @ 9158:ad3d34ddfdcc

QUIC: "handshake_timeout" configuration parameter. Previously QUIC did not have such parameter and handshake duration was controlled by HTTP/3. However that required creating and storing HTTP/3 session on first client datagram. Apparently there's no convenient way to store the session object until QUIC handshake is complete. In the followup patches session creation will be postponed to init() callback.
author Roman Arutyunyan <arut@nginx.com>
date Wed, 13 Sep 2023 17:59:37 +0400
parents f742b1b46901
children
line wrap: on
line source


/*
 * Copyright (C) Nginx, Inc.
 * Copyright (C) Roman Arutyunyan
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>


static ngx_int_t ngx_http_v3_variable(ngx_http_request_t *r,
    ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_v3_add_variables(ngx_conf_t *cf);
static void *ngx_http_v3_create_srv_conf(ngx_conf_t *cf);
static char *ngx_http_v3_merge_srv_conf(ngx_conf_t *cf, void *parent,
    void *child);
static char *ngx_http_quic_host_key(ngx_conf_t *cf, ngx_command_t *cmd,
    void *conf);


static ngx_command_t  ngx_http_v3_commands[] = {

    { ngx_string("http3"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_SRV_CONF_OFFSET,
      offsetof(ngx_http_v3_srv_conf_t, enable),
      NULL },

    { ngx_string("http3_hq"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_SRV_CONF_OFFSET,
      offsetof(ngx_http_v3_srv_conf_t, enable_hq),
      NULL },

    { ngx_string("http3_max_concurrent_streams"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_num_slot,
      NGX_HTTP_SRV_CONF_OFFSET,
      offsetof(ngx_http_v3_srv_conf_t, max_concurrent_streams),
      NULL },

    { ngx_string("http3_stream_buffer_size"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_size_slot,
      NGX_HTTP_SRV_CONF_OFFSET,
      offsetof(ngx_http_v3_srv_conf_t, quic.stream_buffer_size),
      NULL },

    { ngx_string("quic_retry"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_SRV_CONF_OFFSET,
      offsetof(ngx_http_v3_srv_conf_t, quic.retry),
      NULL },

    { ngx_string("quic_gso"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_SRV_CONF_OFFSET,
      offsetof(ngx_http_v3_srv_conf_t, quic.gso_enabled),
      NULL },

    { ngx_string("quic_host_key"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
      ngx_http_quic_host_key,
      NGX_HTTP_SRV_CONF_OFFSET,
      0,
      NULL },

    { ngx_string("quic_active_connection_id_limit"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_num_slot,
      NGX_HTTP_SRV_CONF_OFFSET,
      offsetof(ngx_http_v3_srv_conf_t, quic.active_connection_id_limit),
      NULL },

      ngx_null_command
};


static ngx_http_module_t  ngx_http_v3_module_ctx = {
    ngx_http_v3_add_variables,             /* preconfiguration */
    NULL,                                  /* postconfiguration */

    NULL,                                  /* create main configuration */
    NULL,                                  /* init main configuration */

    ngx_http_v3_create_srv_conf,           /* create server configuration */
    ngx_http_v3_merge_srv_conf,            /* merge server configuration */

    NULL,                                  /* create location configuration */
    NULL                                   /* merge location configuration */
};


ngx_module_t  ngx_http_v3_module = {
    NGX_MODULE_V1,
    &ngx_http_v3_module_ctx,               /* module context */
    ngx_http_v3_commands,                  /* module directives */
    NGX_HTTP_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_http_variable_t  ngx_http_v3_vars[] = {

    { ngx_string("http3"), NULL, ngx_http_v3_variable, 0, 0, 0 },

      ngx_http_null_variable
};

static ngx_str_t  ngx_http_quic_salt = ngx_string("ngx_quic");


static ngx_int_t
ngx_http_v3_variable(ngx_http_request_t *r,
    ngx_http_variable_value_t *v, uintptr_t data)
{
    ngx_http_v3_session_t  *h3c;

    if (r->connection->quic) {
        h3c = ngx_http_v3_get_session(r->connection);

        if (h3c->hq) {
            v->len = sizeof("hq") - 1;
            v->valid = 1;
            v->no_cacheable = 0;
            v->not_found = 0;
            v->data = (u_char *) "hq";

            return NGX_OK;
        }

        v->len = sizeof("h3") - 1;
        v->valid = 1;
        v->no_cacheable = 0;
        v->not_found = 0;
        v->data = (u_char *) "h3";

        return NGX_OK;
    }

    *v = ngx_http_variable_null_value;

    return NGX_OK;
}


static ngx_int_t
ngx_http_v3_add_variables(ngx_conf_t *cf)
{
    ngx_http_variable_t  *var, *v;

    for (v = ngx_http_v3_vars; v->name.len; v++) {
        var = ngx_http_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_http_v3_create_srv_conf(ngx_conf_t *cf)
{
    ngx_http_v3_srv_conf_t  *h3scf;

    h3scf = ngx_pcalloc(cf->pool, sizeof(ngx_http_v3_srv_conf_t));
    if (h3scf == NULL) {
        return NULL;
    }

    /*
     * set by ngx_pcalloc():
     *
     *     h3scf->quic.host_key = { 0, NULL }
     *     h3scf->quic.stream_reject_code_uni = 0;
     *     h3scf->quic.disable_active_migration = 0;
     *     h3scf->quic.idle_timeout = 0;
     *     h3scf->max_blocked_streams = 0;
     */

    h3scf->enable = NGX_CONF_UNSET;
    h3scf->enable_hq = NGX_CONF_UNSET;
    h3scf->max_table_capacity = NGX_HTTP_V3_MAX_TABLE_CAPACITY;
    h3scf->max_concurrent_streams = NGX_CONF_UNSET_UINT;

    h3scf->quic.stream_buffer_size = NGX_CONF_UNSET_SIZE;
    h3scf->quic.max_concurrent_streams_bidi = NGX_CONF_UNSET_UINT;
    h3scf->quic.max_concurrent_streams_uni = NGX_HTTP_V3_MAX_UNI_STREAMS;
    h3scf->quic.retry = NGX_CONF_UNSET;
    h3scf->quic.gso_enabled = NGX_CONF_UNSET;
    h3scf->quic.stream_close_code = NGX_HTTP_V3_ERR_NO_ERROR;
    h3scf->quic.stream_reject_code_bidi = NGX_HTTP_V3_ERR_REQUEST_REJECTED;
    h3scf->quic.active_connection_id_limit = NGX_CONF_UNSET_UINT;

    h3scf->quic.init = ngx_http_v3_init;
    h3scf->quic.shutdown = ngx_http_v3_shutdown;

    return h3scf;
}


static char *
ngx_http_v3_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
{
    ngx_http_v3_srv_conf_t *prev = parent;
    ngx_http_v3_srv_conf_t *conf = child;

    ngx_http_ssl_srv_conf_t   *sscf;
    ngx_http_core_srv_conf_t  *cscf;

    ngx_conf_merge_value(conf->enable, prev->enable, 1);

    ngx_conf_merge_value(conf->enable_hq, prev->enable_hq, 0);

    ngx_conf_merge_uint_value(conf->max_concurrent_streams,
                              prev->max_concurrent_streams, 128);

    conf->max_blocked_streams = conf->max_concurrent_streams;

    ngx_conf_merge_size_value(conf->quic.stream_buffer_size,
                              prev->quic.stream_buffer_size,
                              65536);

    conf->quic.max_concurrent_streams_bidi = conf->max_concurrent_streams;

    ngx_conf_merge_value(conf->quic.retry, prev->quic.retry, 0);
    ngx_conf_merge_value(conf->quic.gso_enabled, prev->quic.gso_enabled, 0);

    ngx_conf_merge_str_value(conf->quic.host_key, prev->quic.host_key, "");

    ngx_conf_merge_uint_value(conf->quic.active_connection_id_limit,
                              prev->quic.active_connection_id_limit,
                              2);

    if (conf->quic.host_key.len == 0) {

        conf->quic.host_key.len = NGX_QUIC_DEFAULT_HOST_KEY_LEN;
        conf->quic.host_key.data = ngx_palloc(cf->pool,
                                              conf->quic.host_key.len);
        if (conf->quic.host_key.data == NULL) {
            return NGX_CONF_ERROR;
        }

        if (RAND_bytes(conf->quic.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->quic.host_key, &ngx_http_quic_salt,
                            conf->quic.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->quic.host_key, &ngx_http_quic_salt,
                            conf->quic.sr_token_key, NGX_QUIC_SR_KEY_LEN)
        != NGX_OK)
    {
        return NGX_CONF_ERROR;
    }

    cscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_core_module);
    conf->quic.handshake_timeout = cscf->client_header_timeout;

    sscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_ssl_module);
    conf->quic.ssl = &sscf->ssl;

    return NGX_CONF_OK;
}


static char *
ngx_http_quic_host_key(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    ngx_http_v3_srv_conf_t  *h3scf = conf;

    u_char           *buf;
    size_t            size;
    ssize_t           n;
    ngx_str_t        *value;
    ngx_file_t        file;
    ngx_file_info_t   fi;
    ngx_quic_conf_t  *qcf;

    qcf = &h3scf->quic;

    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;
}