view src/stream/ngx_stream.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 4f9b72a229c1
children 2ab7b55ae4a0 893b3313f53c
line wrap: on
line source


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


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


static char *ngx_stream_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static ngx_int_t ngx_stream_init_phases(ngx_conf_t *cf,
    ngx_stream_core_main_conf_t *cmcf);
static ngx_int_t ngx_stream_init_phase_handlers(ngx_conf_t *cf,
    ngx_stream_core_main_conf_t *cmcf);
static ngx_int_t ngx_stream_add_ports(ngx_conf_t *cf, ngx_array_t *ports,
    ngx_stream_listen_t *listen);
static char *ngx_stream_optimize_servers(ngx_conf_t *cf, ngx_array_t *ports);
static ngx_int_t ngx_stream_add_addrs(ngx_conf_t *cf, ngx_stream_port_t *stport,
    ngx_stream_conf_addr_t *addr);
#if (NGX_HAVE_INET6)
static ngx_int_t ngx_stream_add_addrs6(ngx_conf_t *cf,
    ngx_stream_port_t *stport, ngx_stream_conf_addr_t *addr);
#endif
static ngx_int_t ngx_stream_cmp_conf_addrs(const void *one, const void *two);


ngx_uint_t  ngx_stream_max_module;


ngx_stream_filter_pt  ngx_stream_top_filter;


static ngx_command_t  ngx_stream_commands[] = {

    { ngx_string("stream"),
      NGX_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_NOARGS,
      ngx_stream_block,
      0,
      0,
      NULL },

      ngx_null_command
};


static ngx_core_module_t  ngx_stream_module_ctx = {
    ngx_string("stream"),
    NULL,
    NULL
};


ngx_module_t  ngx_stream_module = {
    NGX_MODULE_V1,
    &ngx_stream_module_ctx,                /* module context */
    ngx_stream_commands,                   /* module directives */
    NGX_CORE_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 char *
ngx_stream_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    char                          *rv;
    ngx_uint_t                     i, m, mi, s;
    ngx_conf_t                     pcf;
    ngx_array_t                    ports;
    ngx_stream_listen_t           *listen;
    ngx_stream_module_t           *module;
    ngx_stream_conf_ctx_t         *ctx;
    ngx_stream_core_srv_conf_t   **cscfp;
    ngx_stream_core_main_conf_t   *cmcf;

    if (*(ngx_stream_conf_ctx_t **) conf) {
        return "is duplicate";
    }

    /* the main stream context */

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

    *(ngx_stream_conf_ctx_t **) conf = ctx;

    /* count the number of the stream modules and set up their indices */

    ngx_stream_max_module = ngx_count_modules(cf->cycle, NGX_STREAM_MODULE);


    /* the stream main_conf context, it's the same in the all stream contexts */

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


    /*
     * the stream null srv_conf context, it is used to merge
     * the server{}s' srv_conf's
     */

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


    /*
     * create the main_conf's and the null srv_conf's of the all stream modules
     */

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

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

        if (module->create_main_conf) {
            ctx->main_conf[mi] = module->create_main_conf(cf);
            if (ctx->main_conf[mi] == NULL) {
                return NGX_CONF_ERROR;
            }
        }

        if (module->create_srv_conf) {
            ctx->srv_conf[mi] = module->create_srv_conf(cf);
            if (ctx->srv_conf[mi] == NULL) {
                return NGX_CONF_ERROR;
            }
        }
    }


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

    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->preconfiguration) {
            if (module->preconfiguration(cf) != NGX_OK) {
                return NGX_CONF_ERROR;
            }
        }
    }


    /* parse inside the stream{} block */

    cf->module_type = NGX_STREAM_MODULE;
    cf->cmd_type = NGX_STREAM_MAIN_CONF;
    rv = ngx_conf_parse(cf, NULL);

    if (rv != NGX_CONF_OK) {
        *cf = pcf;
        return rv;
    }


    /* init stream{} main_conf's, merge the server{}s' srv_conf's */

    cmcf = ctx->main_conf[ngx_stream_core_module.ctx_index];
    cscfp = cmcf->servers.elts;

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

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

        /* init stream{} main_conf's */

        cf->ctx = ctx;

        if (module->init_main_conf) {
            rv = module->init_main_conf(cf, ctx->main_conf[mi]);
            if (rv != NGX_CONF_OK) {
                *cf = pcf;
                return rv;
            }
        }

        for (s = 0; s < cmcf->servers.nelts; s++) {

            /* merge the server{}s' srv_conf's */

            cf->ctx = cscfp[s]->ctx;

            if (module->merge_srv_conf) {
                rv = module->merge_srv_conf(cf,
                                            ctx->srv_conf[mi],
                                            cscfp[s]->ctx->srv_conf[mi]);
                if (rv != NGX_CONF_OK) {
                    *cf = pcf;
                    return rv;
                }
            }
        }
    }

    if (ngx_stream_init_phases(cf, cmcf) != NGX_OK) {
        return NGX_CONF_ERROR;
    }

    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->postconfiguration) {
            if (module->postconfiguration(cf) != NGX_OK) {
                return NGX_CONF_ERROR;
            }
        }
    }

    if (ngx_stream_variables_init_vars(cf) != NGX_OK) {
        return NGX_CONF_ERROR;
    }

    *cf = pcf;

    if (ngx_stream_init_phase_handlers(cf, cmcf) != NGX_OK) {
        return NGX_CONF_ERROR;
    }

    if (ngx_array_init(&ports, cf->temp_pool, 4, sizeof(ngx_stream_conf_port_t))
        != NGX_OK)
    {
        return NGX_CONF_ERROR;
    }

    listen = cmcf->listen.elts;

    for (i = 0; i < cmcf->listen.nelts; i++) {
        if (ngx_stream_add_ports(cf, &ports, &listen[i]) != NGX_OK) {
            return NGX_CONF_ERROR;
        }
    }

    return ngx_stream_optimize_servers(cf, &ports);
}


static ngx_int_t
ngx_stream_init_phases(ngx_conf_t *cf, ngx_stream_core_main_conf_t *cmcf)
{
    if (ngx_array_init(&cmcf->phases[NGX_STREAM_POST_ACCEPT_PHASE].handlers,
                       cf->pool, 1, sizeof(ngx_stream_handler_pt))
        != NGX_OK)
    {
        return NGX_ERROR;
    }

    if (ngx_array_init(&cmcf->phases[NGX_STREAM_PREACCESS_PHASE].handlers,
                       cf->pool, 1, sizeof(ngx_stream_handler_pt))
        != NGX_OK)
    {
        return NGX_ERROR;
    }

    if (ngx_array_init(&cmcf->phases[NGX_STREAM_ACCESS_PHASE].handlers,
                       cf->pool, 1, sizeof(ngx_stream_handler_pt))
        != NGX_OK)
    {
        return NGX_ERROR;
    }

    if (ngx_array_init(&cmcf->phases[NGX_STREAM_SSL_PHASE].handlers,
                       cf->pool, 1, sizeof(ngx_stream_handler_pt))
        != NGX_OK)
    {
        return NGX_ERROR;
    }

    if (ngx_array_init(&cmcf->phases[NGX_STREAM_PREREAD_PHASE].handlers,
                       cf->pool, 1, sizeof(ngx_stream_handler_pt))
        != NGX_OK)
    {
        return NGX_ERROR;
    }

    if (ngx_array_init(&cmcf->phases[NGX_STREAM_LOG_PHASE].handlers,
                       cf->pool, 1, sizeof(ngx_stream_handler_pt))
        != NGX_OK)
    {
        return NGX_ERROR;
    }

    return NGX_OK;
}


static ngx_int_t
ngx_stream_init_phase_handlers(ngx_conf_t *cf,
    ngx_stream_core_main_conf_t *cmcf)
{
    ngx_int_t                     j;
    ngx_uint_t                    i, n;
    ngx_stream_handler_pt        *h;
    ngx_stream_phase_handler_t   *ph;
    ngx_stream_phase_handler_pt   checker;

    n = 1 /* content phase */;

    for (i = 0; i < NGX_STREAM_LOG_PHASE; i++) {
        n += cmcf->phases[i].handlers.nelts;
    }

    ph = ngx_pcalloc(cf->pool,
                     n * sizeof(ngx_stream_phase_handler_t) + sizeof(void *));
    if (ph == NULL) {
        return NGX_ERROR;
    }

    cmcf->phase_engine.handlers = ph;
    n = 0;

    for (i = 0; i < NGX_STREAM_LOG_PHASE; i++) {
        h = cmcf->phases[i].handlers.elts;

        switch (i) {

        case NGX_STREAM_PREREAD_PHASE:
            checker = ngx_stream_core_preread_phase;
            break;

        case NGX_STREAM_CONTENT_PHASE:
            ph->checker = ngx_stream_core_content_phase;
            n++;
            ph++;

            continue;

        default:
            checker = ngx_stream_core_generic_phase;
        }

        n += cmcf->phases[i].handlers.nelts;

        for (j = cmcf->phases[i].handlers.nelts - 1; j >= 0; j--) {
            ph->checker = checker;
            ph->handler = h[j];
            ph->next = n;
            ph++;
        }
    }

    return NGX_OK;
}


static ngx_int_t
ngx_stream_add_ports(ngx_conf_t *cf, ngx_array_t *ports,
    ngx_stream_listen_t *listen)
{
    in_port_t                p;
    ngx_uint_t               i;
    struct sockaddr         *sa;
    ngx_stream_conf_port_t  *port;
    ngx_stream_conf_addr_t  *addr;

    sa = listen->sockaddr;
    p = ngx_inet_get_port(sa);

    port = ports->elts;
    for (i = 0; i < ports->nelts; i++) {

        if (p == port[i].port
            && listen->type == port[i].type
            && sa->sa_family == port[i].family)
        {
            /* a port is already in the port list */

            port = &port[i];
            goto found;
        }
    }

    /* add a port to the port list */

    port = ngx_array_push(ports);
    if (port == NULL) {
        return NGX_ERROR;
    }

    port->family = sa->sa_family;
    port->type = listen->type;
    port->port = p;

    if (ngx_array_init(&port->addrs, cf->temp_pool, 2,
                       sizeof(ngx_stream_conf_addr_t))
        != NGX_OK)
    {
        return NGX_ERROR;
    }

found:

    addr = ngx_array_push(&port->addrs);
    if (addr == NULL) {
        return NGX_ERROR;
    }

    addr->opt = *listen;

    return NGX_OK;
}


static char *
ngx_stream_optimize_servers(ngx_conf_t *cf, ngx_array_t *ports)
{
    ngx_uint_t                   i, p, last, bind_wildcard;
    ngx_listening_t             *ls;
    ngx_stream_port_t           *stport;
    ngx_stream_conf_port_t      *port;
    ngx_stream_conf_addr_t      *addr;
    ngx_stream_core_srv_conf_t  *cscf;

    port = ports->elts;
    for (p = 0; p < ports->nelts; p++) {

        ngx_sort(port[p].addrs.elts, (size_t) port[p].addrs.nelts,
                 sizeof(ngx_stream_conf_addr_t), ngx_stream_cmp_conf_addrs);

        addr = port[p].addrs.elts;
        last = port[p].addrs.nelts;

        /*
         * if there is the binding to the "*:port" then we need to bind()
         * to the "*:port" only and ignore the other bindings
         */

        if (addr[last - 1].opt.wildcard) {
            addr[last - 1].opt.bind = 1;
            bind_wildcard = 1;

        } else {
            bind_wildcard = 0;
        }

        i = 0;

        while (i < last) {

            if (bind_wildcard && !addr[i].opt.bind) {
                i++;
                continue;
            }

            ls = ngx_create_listening(cf, addr[i].opt.sockaddr,
                                      addr[i].opt.socklen);
            if (ls == NULL) {
                return NGX_CONF_ERROR;
            }

            ls->addr_ntop = 1;
            ls->handler = ngx_stream_init_connection;
            ls->pool_size = 256;
            ls->type = addr[i].opt.type;

            cscf = addr->opt.ctx->srv_conf[ngx_stream_core_module.ctx_index];

            ls->logp = cscf->error_log;
            ls->log.data = &ls->addr_text;
            ls->log.handler = ngx_accept_log_error;

            ls->backlog = addr[i].opt.backlog;
            ls->rcvbuf = addr[i].opt.rcvbuf;
            ls->sndbuf = addr[i].opt.sndbuf;

            ls->wildcard = addr[i].opt.wildcard;

            ls->keepalive = addr[i].opt.so_keepalive;
#if (NGX_HAVE_KEEPALIVE_TUNABLE)
            ls->keepidle = addr[i].opt.tcp_keepidle;
            ls->keepintvl = addr[i].opt.tcp_keepintvl;
            ls->keepcnt = addr[i].opt.tcp_keepcnt;
#endif

#if (NGX_HAVE_INET6)
            ls->ipv6only = addr[i].opt.ipv6only;
#endif

#if (NGX_HAVE_REUSEPORT)
            ls->reuseport = addr[i].opt.reuseport;
#endif

            stport = ngx_palloc(cf->pool, sizeof(ngx_stream_port_t));
            if (stport == NULL) {
                return NGX_CONF_ERROR;
            }

            ls->servers = stport;

            stport->naddrs = i + 1;

            switch (ls->sockaddr->sa_family) {
#if (NGX_HAVE_INET6)
            case AF_INET6:
                if (ngx_stream_add_addrs6(cf, stport, addr) != NGX_OK) {
                    return NGX_CONF_ERROR;
                }
                break;
#endif
            default: /* AF_INET */
                if (ngx_stream_add_addrs(cf, stport, addr) != NGX_OK) {
                    return NGX_CONF_ERROR;
                }
                break;
            }

            addr++;
            last--;
        }
    }

    return NGX_CONF_OK;
}


static ngx_int_t
ngx_stream_add_addrs(ngx_conf_t *cf, ngx_stream_port_t *stport,
    ngx_stream_conf_addr_t *addr)
{
    ngx_uint_t             i;
    struct sockaddr_in    *sin;
    ngx_stream_in_addr_t  *addrs;

    stport->addrs = ngx_pcalloc(cf->pool,
                                stport->naddrs * sizeof(ngx_stream_in_addr_t));
    if (stport->addrs == NULL) {
        return NGX_ERROR;
    }

    addrs = stport->addrs;

    for (i = 0; i < stport->naddrs; i++) {

        sin = (struct sockaddr_in *) addr[i].opt.sockaddr;
        addrs[i].addr = sin->sin_addr.s_addr;

        addrs[i].conf.ctx = addr[i].opt.ctx;
#if (NGX_STREAM_SSL)
        addrs[i].conf.ssl = addr[i].opt.ssl;
#endif
        addrs[i].conf.proxy_protocol = addr[i].opt.proxy_protocol;
        addrs[i].conf.addr_text = addr[i].opt.addr_text;
    }

    return NGX_OK;
}


#if (NGX_HAVE_INET6)

static ngx_int_t
ngx_stream_add_addrs6(ngx_conf_t *cf, ngx_stream_port_t *stport,
    ngx_stream_conf_addr_t *addr)
{
    ngx_uint_t              i;
    struct sockaddr_in6    *sin6;
    ngx_stream_in6_addr_t  *addrs6;

    stport->addrs = ngx_pcalloc(cf->pool,
                                stport->naddrs * sizeof(ngx_stream_in6_addr_t));
    if (stport->addrs == NULL) {
        return NGX_ERROR;
    }

    addrs6 = stport->addrs;

    for (i = 0; i < stport->naddrs; i++) {

        sin6 = (struct sockaddr_in6 *) addr[i].opt.sockaddr;
        addrs6[i].addr6 = sin6->sin6_addr;

        addrs6[i].conf.ctx = addr[i].opt.ctx;
#if (NGX_STREAM_SSL)
        addrs6[i].conf.ssl = addr[i].opt.ssl;
#endif
        addrs6[i].conf.proxy_protocol = addr[i].opt.proxy_protocol;
        addrs6[i].conf.addr_text = addr[i].opt.addr_text;
    }

    return NGX_OK;
}

#endif


static ngx_int_t
ngx_stream_cmp_conf_addrs(const void *one, const void *two)
{
    ngx_stream_conf_addr_t  *first, *second;

    first = (ngx_stream_conf_addr_t *) one;
    second = (ngx_stream_conf_addr_t *) two;

    if (first->opt.wildcard) {
        /* a wildcard must be the last resort, shift it to the end */
        return 1;
    }

    if (second->opt.wildcard) {
        /* a wildcard must be the last resort, shift it to the end */
        return -1;
    }

    if (first->opt.bind && !second->opt.bind) {
        /* shift explicit bind()ed addresses to the start */
        return -1;
    }

    if (!first->opt.bind && second->opt.bind) {
        /* shift explicit bind()ed addresses to the start */
        return 1;
    }

    /* do not sort by default */

    return 0;
}