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view src/http/modules/ngx_http_access_module.c @ 7732:59e1c73fe02b

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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 72188d1bcab5
children
line wrap: on
line source


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


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


typedef struct {
    in_addr_t         mask;
    in_addr_t         addr;
    ngx_uint_t        deny;      /* unsigned  deny:1; */
} ngx_http_access_rule_t;

#if (NGX_HAVE_INET6)

typedef struct {
    struct in6_addr   addr;
    struct in6_addr   mask;
    ngx_uint_t        deny;      /* unsigned  deny:1; */
} ngx_http_access_rule6_t;

#endif

#if (NGX_HAVE_UNIX_DOMAIN)

typedef struct {
    ngx_uint_t        deny;      /* unsigned  deny:1; */
} ngx_http_access_rule_un_t;

#endif

typedef struct {
    ngx_array_t      *rules;     /* array of ngx_http_access_rule_t */
#if (NGX_HAVE_INET6)
    ngx_array_t      *rules6;    /* array of ngx_http_access_rule6_t */
#endif
#if (NGX_HAVE_UNIX_DOMAIN)
    ngx_array_t      *rules_un;  /* array of ngx_http_access_rule_un_t */
#endif
} ngx_http_access_loc_conf_t;


static ngx_int_t ngx_http_access_handler(ngx_http_request_t *r);
static ngx_int_t ngx_http_access_inet(ngx_http_request_t *r,
    ngx_http_access_loc_conf_t *alcf, in_addr_t addr);
#if (NGX_HAVE_INET6)
static ngx_int_t ngx_http_access_inet6(ngx_http_request_t *r,
    ngx_http_access_loc_conf_t *alcf, u_char *p);
#endif
#if (NGX_HAVE_UNIX_DOMAIN)
static ngx_int_t ngx_http_access_unix(ngx_http_request_t *r,
    ngx_http_access_loc_conf_t *alcf);
#endif
static ngx_int_t ngx_http_access_found(ngx_http_request_t *r, ngx_uint_t deny);
static char *ngx_http_access_rule(ngx_conf_t *cf, ngx_command_t *cmd,
    void *conf);
static void *ngx_http_access_create_loc_conf(ngx_conf_t *cf);
static char *ngx_http_access_merge_loc_conf(ngx_conf_t *cf,
    void *parent, void *child);
static ngx_int_t ngx_http_access_init(ngx_conf_t *cf);


static ngx_command_t  ngx_http_access_commands[] = {

    { ngx_string("allow"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF
                        |NGX_CONF_TAKE1,
      ngx_http_access_rule,
      NGX_HTTP_LOC_CONF_OFFSET,
      0,
      NULL },

    { ngx_string("deny"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF
                        |NGX_CONF_TAKE1,
      ngx_http_access_rule,
      NGX_HTTP_LOC_CONF_OFFSET,
      0,
      NULL },

      ngx_null_command
};



static ngx_http_module_t  ngx_http_access_module_ctx = {
    NULL,                                  /* preconfiguration */
    ngx_http_access_init,                  /* postconfiguration */

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

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

    ngx_http_access_create_loc_conf,       /* create location configuration */
    ngx_http_access_merge_loc_conf         /* merge location configuration */
};


ngx_module_t  ngx_http_access_module = {
    NGX_MODULE_V1,
    &ngx_http_access_module_ctx,           /* module context */
    ngx_http_access_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_int_t
ngx_http_access_handler(ngx_http_request_t *r)
{
    struct sockaddr_in          *sin;
    ngx_http_access_loc_conf_t  *alcf;
#if (NGX_HAVE_INET6)
    u_char                      *p;
    in_addr_t                    addr;
    struct sockaddr_in6         *sin6;
#endif

    alcf = ngx_http_get_module_loc_conf(r, ngx_http_access_module);

    switch (r->connection->sockaddr->sa_family) {

    case AF_INET:
        if (alcf->rules) {
            sin = (struct sockaddr_in *) r->connection->sockaddr;
            return ngx_http_access_inet(r, alcf, sin->sin_addr.s_addr);
        }
        break;

#if (NGX_HAVE_INET6)

    case AF_INET6:
        sin6 = (struct sockaddr_in6 *) r->connection->sockaddr;
        p = sin6->sin6_addr.s6_addr;

        if (alcf->rules && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
            addr = p[12] << 24;
            addr += p[13] << 16;
            addr += p[14] << 8;
            addr += p[15];
            return ngx_http_access_inet(r, alcf, htonl(addr));
        }

        if (alcf->rules6) {
            return ngx_http_access_inet6(r, alcf, p);
        }

        break;

#endif

#if (NGX_HAVE_UNIX_DOMAIN)

    case AF_UNIX:
        if (alcf->rules_un) {
            return ngx_http_access_unix(r, alcf);
        }

        break;

#endif
    }

    return NGX_DECLINED;
}


static ngx_int_t
ngx_http_access_inet(ngx_http_request_t *r, ngx_http_access_loc_conf_t *alcf,
    in_addr_t addr)
{
    ngx_uint_t               i;
    ngx_http_access_rule_t  *rule;

    rule = alcf->rules->elts;
    for (i = 0; i < alcf->rules->nelts; i++) {

        ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                       "access: %08XD %08XD %08XD",
                       addr, rule[i].mask, rule[i].addr);

        if ((addr & rule[i].mask) == rule[i].addr) {
            return ngx_http_access_found(r, rule[i].deny);
        }
    }

    return NGX_DECLINED;
}


#if (NGX_HAVE_INET6)

static ngx_int_t
ngx_http_access_inet6(ngx_http_request_t *r, ngx_http_access_loc_conf_t *alcf,
    u_char *p)
{
    ngx_uint_t                n;
    ngx_uint_t                i;
    ngx_http_access_rule6_t  *rule6;

    rule6 = alcf->rules6->elts;
    for (i = 0; i < alcf->rules6->nelts; i++) {

#if (NGX_DEBUG)
        {
        size_t  cl, ml, al;
        u_char  ct[NGX_INET6_ADDRSTRLEN];
        u_char  mt[NGX_INET6_ADDRSTRLEN];
        u_char  at[NGX_INET6_ADDRSTRLEN];

        cl = ngx_inet6_ntop(p, ct, NGX_INET6_ADDRSTRLEN);
        ml = ngx_inet6_ntop(rule6[i].mask.s6_addr, mt, NGX_INET6_ADDRSTRLEN);
        al = ngx_inet6_ntop(rule6[i].addr.s6_addr, at, NGX_INET6_ADDRSTRLEN);

        ngx_log_debug6(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                       "access: %*s %*s %*s", cl, ct, ml, mt, al, at);
        }
#endif

        for (n = 0; n < 16; n++) {
            if ((p[n] & rule6[i].mask.s6_addr[n]) != rule6[i].addr.s6_addr[n]) {
                goto next;
            }
        }

        return ngx_http_access_found(r, rule6[i].deny);

    next:
        continue;
    }

    return NGX_DECLINED;
}

#endif


#if (NGX_HAVE_UNIX_DOMAIN)

static ngx_int_t
ngx_http_access_unix(ngx_http_request_t *r, ngx_http_access_loc_conf_t *alcf)
{
    ngx_uint_t                  i;
    ngx_http_access_rule_un_t  *rule_un;

    rule_un = alcf->rules_un->elts;
    for (i = 0; i < alcf->rules_un->nelts; i++) {

        /* TODO: check path */
        if (1) {
            return ngx_http_access_found(r, rule_un[i].deny);
        }
    }

    return NGX_DECLINED;
}

#endif


static ngx_int_t
ngx_http_access_found(ngx_http_request_t *r, ngx_uint_t deny)
{
    ngx_http_core_loc_conf_t  *clcf;

    if (deny) {
        clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);

        if (clcf->satisfy == NGX_HTTP_SATISFY_ALL) {
            ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                          "access forbidden by rule");
        }

        return NGX_HTTP_FORBIDDEN;
    }

    return NGX_OK;
}


static char *
ngx_http_access_rule(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    ngx_http_access_loc_conf_t *alcf = conf;

    ngx_int_t                   rc;
    ngx_uint_t                  all;
    ngx_str_t                  *value;
    ngx_cidr_t                  cidr;
    ngx_http_access_rule_t     *rule;
#if (NGX_HAVE_INET6)
    ngx_http_access_rule6_t    *rule6;
#endif
#if (NGX_HAVE_UNIX_DOMAIN)
    ngx_http_access_rule_un_t  *rule_un;
#endif

    all = 0;
    ngx_memzero(&cidr, sizeof(ngx_cidr_t));

    value = cf->args->elts;

    if (value[1].len == 3 && ngx_strcmp(value[1].data, "all") == 0) {
        all = 1;

#if (NGX_HAVE_UNIX_DOMAIN)
    } else if (value[1].len == 5 && ngx_strcmp(value[1].data, "unix:") == 0) {
        cidr.family = AF_UNIX;
#endif

    } else {
        rc = ngx_ptocidr(&value[1], &cidr);

        if (rc == NGX_ERROR) {
            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                         "invalid parameter \"%V\"", &value[1]);
            return NGX_CONF_ERROR;
        }

        if (rc == NGX_DONE) {
            ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
                         "low address bits of %V are meaningless", &value[1]);
        }
    }

    if (cidr.family == AF_INET || all) {

        if (alcf->rules == NULL) {
            alcf->rules = ngx_array_create(cf->pool, 4,
                                           sizeof(ngx_http_access_rule_t));
            if (alcf->rules == NULL) {
                return NGX_CONF_ERROR;
            }
        }

        rule = ngx_array_push(alcf->rules);
        if (rule == NULL) {
            return NGX_CONF_ERROR;
        }

        rule->mask = cidr.u.in.mask;
        rule->addr = cidr.u.in.addr;
        rule->deny = (value[0].data[0] == 'd') ? 1 : 0;
    }

#if (NGX_HAVE_INET6)
    if (cidr.family == AF_INET6 || all) {

        if (alcf->rules6 == NULL) {
            alcf->rules6 = ngx_array_create(cf->pool, 4,
                                            sizeof(ngx_http_access_rule6_t));
            if (alcf->rules6 == NULL) {
                return NGX_CONF_ERROR;
            }
        }

        rule6 = ngx_array_push(alcf->rules6);
        if (rule6 == NULL) {
            return NGX_CONF_ERROR;
        }

        rule6->mask = cidr.u.in6.mask;
        rule6->addr = cidr.u.in6.addr;
        rule6->deny = (value[0].data[0] == 'd') ? 1 : 0;
    }
#endif

#if (NGX_HAVE_UNIX_DOMAIN)
    if (cidr.family == AF_UNIX || all) {

        if (alcf->rules_un == NULL) {
            alcf->rules_un = ngx_array_create(cf->pool, 1,
                                            sizeof(ngx_http_access_rule_un_t));
            if (alcf->rules_un == NULL) {
                return NGX_CONF_ERROR;
            }
        }

        rule_un = ngx_array_push(alcf->rules_un);
        if (rule_un == NULL) {
            return NGX_CONF_ERROR;
        }

        rule_un->deny = (value[0].data[0] == 'd') ? 1 : 0;
    }
#endif

    return NGX_CONF_OK;
}


static void *
ngx_http_access_create_loc_conf(ngx_conf_t *cf)
{
    ngx_http_access_loc_conf_t  *conf;

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

    return conf;
}


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

    if (conf->rules == NULL
#if (NGX_HAVE_INET6)
        && conf->rules6 == NULL
#endif
#if (NGX_HAVE_UNIX_DOMAIN)
        && conf->rules_un == NULL
#endif
    ) {
        conf->rules = prev->rules;
#if (NGX_HAVE_INET6)
        conf->rules6 = prev->rules6;
#endif
#if (NGX_HAVE_UNIX_DOMAIN)
        conf->rules_un = prev->rules_un;
#endif
    }

    return NGX_CONF_OK;
}


static ngx_int_t
ngx_http_access_init(ngx_conf_t *cf)
{
    ngx_http_handler_pt        *h;
    ngx_http_core_main_conf_t  *cmcf;

    cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);

    h = ngx_array_push(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers);
    if (h == NULL) {
        return NGX_ERROR;
    }

    *h = ngx_http_access_handler;

    return NGX_OK;
}