view src/stream/ngx_stream_upstream.c @ 7732:59e1c73fe02b

SSL: ssl_reject_handshake directive (ticket #195). In some cases it might be needed to reject SSL handshake based on SNI server name provided, for example, to make sure an invalid certificate is not returned to clients trying to contact a name-based virtual server without SSL configured. Previously, a "ssl_ciphers aNULL;" was used for this. This workaround, however, is not compatible with TLSv1.3, in particular, when using BoringSSL, where it is not possible to configure TLSv1.3 ciphers at all. With this change, the ssl_reject_handshake directive is introduced, which instructs nginx to reject SSL handshakes with an "unrecognized_name" alert in a particular server block. For example, to reject handshake with names other than example.com, one can use the following configuration: server { listen 443 ssl; ssl_reject_handshake on; } server { listen 443 ssl; server_name example.com; ssl_certificate example.com.crt; ssl_certificate_key example.com.key; } The following configuration can be used to reject all SSL handshakes without SNI server name provided: server { listen 443 ssl; ssl_reject_handshake on; } server { listen 443 ssl; server_name ~^; ssl_certificate example.crt; ssl_certificate_key example.key; } Additionally, the ssl_reject_handshake directive makes configuring certificates for the default server block optional. If no certificates are configured in the default server for a given listening socket, certificates must be defined in all non-default server blocks with the listening socket in question.
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 22 Oct 2020 18:02:28 +0300
parents 860d3907da1c
children
line wrap: on
line source


/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


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


static ngx_int_t ngx_stream_upstream_add_variables(ngx_conf_t *cf);
static ngx_int_t ngx_stream_upstream_addr_variable(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_upstream_response_time_variable(
    ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_upstream_bytes_variable(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);

static char *ngx_stream_upstream(ngx_conf_t *cf, ngx_command_t *cmd,
    void *dummy);
static char *ngx_stream_upstream_server(ngx_conf_t *cf, ngx_command_t *cmd,
    void *conf);
static void *ngx_stream_upstream_create_main_conf(ngx_conf_t *cf);
static char *ngx_stream_upstream_init_main_conf(ngx_conf_t *cf, void *conf);


static ngx_command_t  ngx_stream_upstream_commands[] = {

    { ngx_string("upstream"),
      NGX_STREAM_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE1,
      ngx_stream_upstream,
      0,
      0,
      NULL },

    { ngx_string("server"),
      NGX_STREAM_UPS_CONF|NGX_CONF_1MORE,
      ngx_stream_upstream_server,
      NGX_STREAM_SRV_CONF_OFFSET,
      0,
      NULL },

      ngx_null_command
};


static ngx_stream_module_t  ngx_stream_upstream_module_ctx = {
    ngx_stream_upstream_add_variables,     /* preconfiguration */
    NULL,                                  /* postconfiguration */

    ngx_stream_upstream_create_main_conf,  /* create main configuration */
    ngx_stream_upstream_init_main_conf,    /* init main configuration */

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


ngx_module_t  ngx_stream_upstream_module = {
    NGX_MODULE_V1,
    &ngx_stream_upstream_module_ctx,       /* module context */
    ngx_stream_upstream_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_upstream_vars[] = {

    { ngx_string("upstream_addr"), NULL,
      ngx_stream_upstream_addr_variable, 0,
      NGX_STREAM_VAR_NOCACHEABLE, 0 },

    { ngx_string("upstream_bytes_sent"), NULL,
      ngx_stream_upstream_bytes_variable, 0,
      NGX_STREAM_VAR_NOCACHEABLE, 0 },

    { ngx_string("upstream_connect_time"), NULL,
      ngx_stream_upstream_response_time_variable, 2,
      NGX_STREAM_VAR_NOCACHEABLE, 0 },

    { ngx_string("upstream_first_byte_time"), NULL,
      ngx_stream_upstream_response_time_variable, 1,
      NGX_STREAM_VAR_NOCACHEABLE, 0 },

    { ngx_string("upstream_session_time"), NULL,
      ngx_stream_upstream_response_time_variable, 0,
      NGX_STREAM_VAR_NOCACHEABLE, 0 },

    { ngx_string("upstream_bytes_received"), NULL,
      ngx_stream_upstream_bytes_variable, 1,
      NGX_STREAM_VAR_NOCACHEABLE, 0 },

      ngx_stream_null_variable
};


static ngx_int_t
ngx_stream_upstream_add_variables(ngx_conf_t *cf)
{
    ngx_stream_variable_t  *var, *v;

    for (v = ngx_stream_upstream_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 ngx_int_t
ngx_stream_upstream_addr_variable(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    u_char                       *p;
    size_t                        len;
    ngx_uint_t                    i;
    ngx_stream_upstream_state_t  *state;

    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;

    if (s->upstream_states == NULL || s->upstream_states->nelts == 0) {
        v->not_found = 1;
        return NGX_OK;
    }

    len = 0;
    state = s->upstream_states->elts;

    for (i = 0; i < s->upstream_states->nelts; i++) {
        if (state[i].peer) {
            len += state[i].peer->len;
        }

        len += 2;
    }

    p = ngx_pnalloc(s->connection->pool, len);
    if (p == NULL) {
        return NGX_ERROR;
    }

    v->data = p;

    i = 0;

    for ( ;; ) {
        if (state[i].peer) {
            p = ngx_cpymem(p, state[i].peer->data, state[i].peer->len);
        }

        if (++i == s->upstream_states->nelts) {
            break;
        }

        *p++ = ',';
        *p++ = ' ';
    }

    v->len = p - v->data;

    return NGX_OK;
}


static ngx_int_t
ngx_stream_upstream_bytes_variable(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    u_char                       *p;
    size_t                        len;
    ngx_uint_t                    i;
    ngx_stream_upstream_state_t  *state;

    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;

    if (s->upstream_states == NULL || s->upstream_states->nelts == 0) {
        v->not_found = 1;
        return NGX_OK;
    }

    len = s->upstream_states->nelts * (NGX_OFF_T_LEN + 2);

    p = ngx_pnalloc(s->connection->pool, len);
    if (p == NULL) {
        return NGX_ERROR;
    }

    v->data = p;

    i = 0;
    state = s->upstream_states->elts;

    for ( ;; ) {

        if (data == 1) {
            p = ngx_sprintf(p, "%O", state[i].bytes_received);

        } else {
            p = ngx_sprintf(p, "%O", state[i].bytes_sent);
        }

        if (++i == s->upstream_states->nelts) {
            break;
        }

        *p++ = ',';
        *p++ = ' ';
    }

    v->len = p - v->data;

    return NGX_OK;
}


static ngx_int_t
ngx_stream_upstream_response_time_variable(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    u_char                       *p;
    size_t                        len;
    ngx_uint_t                    i;
    ngx_msec_int_t                ms;
    ngx_stream_upstream_state_t  *state;

    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;

    if (s->upstream_states == NULL || s->upstream_states->nelts == 0) {
        v->not_found = 1;
        return NGX_OK;
    }

    len = s->upstream_states->nelts * (NGX_TIME_T_LEN + 4 + 2);

    p = ngx_pnalloc(s->connection->pool, len);
    if (p == NULL) {
        return NGX_ERROR;
    }

    v->data = p;

    i = 0;
    state = s->upstream_states->elts;

    for ( ;; ) {

        if (data == 1) {
            ms = state[i].first_byte_time;

        } else if (data == 2) {
            ms = state[i].connect_time;

        } else {
            ms = state[i].response_time;
        }

        if (ms != -1) {
            ms = ngx_max(ms, 0);
            p = ngx_sprintf(p, "%T.%03M", (time_t) ms / 1000, ms % 1000);

        } else {
            *p++ = '-';
        }

        if (++i == s->upstream_states->nelts) {
            break;
        }

        *p++ = ',';
        *p++ = ' ';
    }

    v->len = p - v->data;

    return NGX_OK;
}


static char *
ngx_stream_upstream(ngx_conf_t *cf, ngx_command_t *cmd, void *dummy)
{
    char                            *rv;
    void                            *mconf;
    ngx_str_t                       *value;
    ngx_url_t                        u;
    ngx_uint_t                       m;
    ngx_conf_t                       pcf;
    ngx_stream_module_t             *module;
    ngx_stream_conf_ctx_t           *ctx, *stream_ctx;
    ngx_stream_upstream_srv_conf_t  *uscf;

    ngx_memzero(&u, sizeof(ngx_url_t));

    value = cf->args->elts;
    u.host = value[1];
    u.no_resolve = 1;
    u.no_port = 1;

    uscf = ngx_stream_upstream_add(cf, &u, NGX_STREAM_UPSTREAM_CREATE
                                           |NGX_STREAM_UPSTREAM_WEIGHT
                                           |NGX_STREAM_UPSTREAM_MAX_CONNS
                                           |NGX_STREAM_UPSTREAM_MAX_FAILS
                                           |NGX_STREAM_UPSTREAM_FAIL_TIMEOUT
                                           |NGX_STREAM_UPSTREAM_DOWN
                                           |NGX_STREAM_UPSTREAM_BACKUP);
    if (uscf == NULL) {
        return NGX_CONF_ERROR;
    }


    ctx = ngx_pcalloc(cf->pool, sizeof(ngx_stream_conf_ctx_t));
    if (ctx == NULL) {
        return NGX_CONF_ERROR;
    }

    stream_ctx = cf->ctx;
    ctx->main_conf = stream_ctx->main_conf;

    /* the upstream{}'s srv_conf */

    ctx->srv_conf = ngx_pcalloc(cf->pool,
                                sizeof(void *) * ngx_stream_max_module);
    if (ctx->srv_conf == NULL) {
        return NGX_CONF_ERROR;
    }

    ctx->srv_conf[ngx_stream_upstream_module.ctx_index] = uscf;

    uscf->srv_conf = ctx->srv_conf;

    for (m = 0; cf->cycle->modules[m]; m++) {
        if (cf->cycle->modules[m]->type != NGX_STREAM_MODULE) {
            continue;
        }

        module = cf->cycle->modules[m]->ctx;

        if (module->create_srv_conf) {
            mconf = module->create_srv_conf(cf);
            if (mconf == NULL) {
                return NGX_CONF_ERROR;
            }

            ctx->srv_conf[cf->cycle->modules[m]->ctx_index] = mconf;
        }
    }

    uscf->servers = ngx_array_create(cf->pool, 4,
                                     sizeof(ngx_stream_upstream_server_t));
    if (uscf->servers == NULL) {
        return NGX_CONF_ERROR;
    }


    /* parse inside upstream{} */

    pcf = *cf;
    cf->ctx = ctx;
    cf->cmd_type = NGX_STREAM_UPS_CONF;

    rv = ngx_conf_parse(cf, NULL);

    *cf = pcf;

    if (rv != NGX_CONF_OK) {
        return rv;
    }

    if (uscf->servers->nelts == 0) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "no servers are inside upstream");
        return NGX_CONF_ERROR;
    }

    return rv;
}


static char *
ngx_stream_upstream_server(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    ngx_stream_upstream_srv_conf_t  *uscf = conf;

    time_t                         fail_timeout;
    ngx_str_t                     *value, s;
    ngx_url_t                      u;
    ngx_int_t                      weight, max_conns, max_fails;
    ngx_uint_t                     i;
    ngx_stream_upstream_server_t  *us;

    us = ngx_array_push(uscf->servers);
    if (us == NULL) {
        return NGX_CONF_ERROR;
    }

    ngx_memzero(us, sizeof(ngx_stream_upstream_server_t));

    value = cf->args->elts;

    weight = 1;
    max_conns = 0;
    max_fails = 1;
    fail_timeout = 10;

    for (i = 2; i < cf->args->nelts; i++) {

        if (ngx_strncmp(value[i].data, "weight=", 7) == 0) {

            if (!(uscf->flags & NGX_STREAM_UPSTREAM_WEIGHT)) {
                goto not_supported;
            }

            weight = ngx_atoi(&value[i].data[7], value[i].len - 7);

            if (weight == NGX_ERROR || weight == 0) {
                goto invalid;
            }

            continue;
        }

        if (ngx_strncmp(value[i].data, "max_conns=", 10) == 0) {

            if (!(uscf->flags & NGX_STREAM_UPSTREAM_MAX_CONNS)) {
                goto not_supported;
            }

            max_conns = ngx_atoi(&value[i].data[10], value[i].len - 10);

            if (max_conns == NGX_ERROR) {
                goto invalid;
            }

            continue;
        }

        if (ngx_strncmp(value[i].data, "max_fails=", 10) == 0) {

            if (!(uscf->flags & NGX_STREAM_UPSTREAM_MAX_FAILS)) {
                goto not_supported;
            }

            max_fails = ngx_atoi(&value[i].data[10], value[i].len - 10);

            if (max_fails == NGX_ERROR) {
                goto invalid;
            }

            continue;
        }

        if (ngx_strncmp(value[i].data, "fail_timeout=", 13) == 0) {

            if (!(uscf->flags & NGX_STREAM_UPSTREAM_FAIL_TIMEOUT)) {
                goto not_supported;
            }

            s.len = value[i].len - 13;
            s.data = &value[i].data[13];

            fail_timeout = ngx_parse_time(&s, 1);

            if (fail_timeout == (time_t) NGX_ERROR) {
                goto invalid;
            }

            continue;
        }

        if (ngx_strcmp(value[i].data, "backup") == 0) {

            if (!(uscf->flags & NGX_STREAM_UPSTREAM_BACKUP)) {
                goto not_supported;
            }

            us->backup = 1;

            continue;
        }

        if (ngx_strcmp(value[i].data, "down") == 0) {

            if (!(uscf->flags & NGX_STREAM_UPSTREAM_DOWN)) {
                goto not_supported;
            }

            us->down = 1;

            continue;
        }

        goto invalid;
    }

    ngx_memzero(&u, sizeof(ngx_url_t));

    u.url = value[1];

    if (ngx_parse_url(cf->pool, &u) != NGX_OK) {
        if (u.err) {
            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                               "%s in upstream \"%V\"", u.err, &u.url);
        }

        return NGX_CONF_ERROR;
    }

    if (u.no_port) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "no port in upstream \"%V\"", &u.url);
        return NGX_CONF_ERROR;
    }

    us->name = u.url;
    us->addrs = u.addrs;
    us->naddrs = u.naddrs;
    us->weight = weight;
    us->max_conns = max_conns;
    us->max_fails = max_fails;
    us->fail_timeout = fail_timeout;

    return NGX_CONF_OK;

invalid:

    ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                       "invalid parameter \"%V\"", &value[i]);

    return NGX_CONF_ERROR;

not_supported:

    ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                       "balancing method does not support parameter \"%V\"",
                       &value[i]);

    return NGX_CONF_ERROR;
}


ngx_stream_upstream_srv_conf_t *
ngx_stream_upstream_add(ngx_conf_t *cf, ngx_url_t *u, ngx_uint_t flags)
{
    ngx_uint_t                        i;
    ngx_stream_upstream_server_t     *us;
    ngx_stream_upstream_srv_conf_t   *uscf, **uscfp;
    ngx_stream_upstream_main_conf_t  *umcf;

    if (!(flags & NGX_STREAM_UPSTREAM_CREATE)) {

        if (ngx_parse_url(cf->pool, u) != NGX_OK) {
            if (u->err) {
                ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                   "%s in upstream \"%V\"", u->err, &u->url);
            }

            return NULL;
        }
    }

    umcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_upstream_module);

    uscfp = umcf->upstreams.elts;

    for (i = 0; i < umcf->upstreams.nelts; i++) {

        if (uscfp[i]->host.len != u->host.len
            || ngx_strncasecmp(uscfp[i]->host.data, u->host.data, u->host.len)
               != 0)
        {
            continue;
        }

        if ((flags & NGX_STREAM_UPSTREAM_CREATE)
             && (uscfp[i]->flags & NGX_STREAM_UPSTREAM_CREATE))
        {
            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                               "duplicate upstream \"%V\"", &u->host);
            return NULL;
        }

        if ((uscfp[i]->flags & NGX_STREAM_UPSTREAM_CREATE) && !u->no_port) {
            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                               "upstream \"%V\" may not have port %d",
                               &u->host, u->port);
            return NULL;
        }

        if ((flags & NGX_STREAM_UPSTREAM_CREATE) && !uscfp[i]->no_port) {
            ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
                          "upstream \"%V\" may not have port %d in %s:%ui",
                          &u->host, uscfp[i]->port,
                          uscfp[i]->file_name, uscfp[i]->line);
            return NULL;
        }

        if (uscfp[i]->port != u->port) {
            continue;
        }

        if (flags & NGX_STREAM_UPSTREAM_CREATE) {
            uscfp[i]->flags = flags;
        }

        return uscfp[i];
    }

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

    uscf->flags = flags;
    uscf->host = u->host;
    uscf->file_name = cf->conf_file->file.name.data;
    uscf->line = cf->conf_file->line;
    uscf->port = u->port;
    uscf->no_port = u->no_port;

    if (u->naddrs == 1 && (u->port || u->family == AF_UNIX)) {
        uscf->servers = ngx_array_create(cf->pool, 1,
                                         sizeof(ngx_stream_upstream_server_t));
        if (uscf->servers == NULL) {
            return NULL;
        }

        us = ngx_array_push(uscf->servers);
        if (us == NULL) {
            return NULL;
        }

        ngx_memzero(us, sizeof(ngx_stream_upstream_server_t));

        us->addrs = u->addrs;
        us->naddrs = 1;
    }

    uscfp = ngx_array_push(&umcf->upstreams);
    if (uscfp == NULL) {
        return NULL;
    }

    *uscfp = uscf;

    return uscf;
}


static void *
ngx_stream_upstream_create_main_conf(ngx_conf_t *cf)
{
    ngx_stream_upstream_main_conf_t  *umcf;

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

    if (ngx_array_init(&umcf->upstreams, cf->pool, 4,
                       sizeof(ngx_stream_upstream_srv_conf_t *))
        != NGX_OK)
    {
        return NULL;
    }

    return umcf;
}


static char *
ngx_stream_upstream_init_main_conf(ngx_conf_t *cf, void *conf)
{
    ngx_stream_upstream_main_conf_t *umcf = conf;

    ngx_uint_t                        i;
    ngx_stream_upstream_init_pt       init;
    ngx_stream_upstream_srv_conf_t  **uscfp;

    uscfp = umcf->upstreams.elts;

    for (i = 0; i < umcf->upstreams.nelts; i++) {

        init = uscfp[i]->peer.init_upstream
                                         ? uscfp[i]->peer.init_upstream
                                         : ngx_stream_upstream_init_round_robin;

        if (init(cf, uscfp[i]) != NGX_OK) {
            return NGX_CONF_ERROR;
        }
    }

    return NGX_CONF_OK;
}