new file mode 100644
--- /dev/null
+++ b/src/http/modules/ngx_http_auth_basic_module.c
@@ -0,0 +1,436 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_http.h>
+
+
+#define NGX_HTTP_AUTH_BUF_SIZE  2048
+
+
+typedef struct {
+    ngx_str_t  passwd;
+} ngx_http_auth_basic_ctx_t;
+
+
+typedef struct {
+    ngx_str_t  realm;
+    ngx_str_t  user_file;
+} ngx_http_auth_basic_loc_conf_t;
+
+
+static ngx_int_t ngx_http_auth_basic_handler(ngx_http_request_t *r);
+static ngx_int_t ngx_http_auth_basic_crypt_handler(ngx_http_request_t *r,
+    ngx_http_auth_basic_ctx_t *ctx, ngx_str_t *passwd, ngx_str_t *realm);
+static ngx_int_t ngx_http_auth_basic_set_realm(ngx_http_request_t *r,
+    ngx_str_t *realm);
+static void ngx_http_auth_basic_close(ngx_file_t *file);
+static void *ngx_http_auth_basic_create_loc_conf(ngx_conf_t *cf);
+static char *ngx_http_auth_basic_merge_loc_conf(ngx_conf_t *cf,
+    void *parent, void *child);
+static ngx_int_t ngx_http_auth_basic_init(ngx_cycle_t *cycle);
+static char *ngx_http_auth_basic(ngx_conf_t *cf, void *post, void *data);
+
+
+static ngx_conf_post_handler_pt  ngx_http_auth_basic_p = ngx_http_auth_basic;
+
+static ngx_command_t  ngx_http_auth_basic_commands[] = {
+
+    { ngx_string("auth_basic"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_str_slot,
+      NGX_HTTP_LOC_CONF_OFFSET,
+      offsetof(ngx_http_auth_basic_loc_conf_t, realm),
+      &ngx_http_auth_basic_p },
+
+    { ngx_string("auth_basic_user_file"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_str_slot,
+      NGX_HTTP_LOC_CONF_OFFSET,
+      offsetof(ngx_http_auth_basic_loc_conf_t, user_file),
+      NULL },
+
+      ngx_null_command
+};
+
+
+
+ngx_http_module_t  ngx_http_auth_basic_module_ctx = {
+    NULL,                                  /* pre conf */
+
+    NULL,                                  /* create main configuration */
+    NULL,                                  /* init main configuration */
+
+    NULL,                                  /* create server configuration */
+    NULL,                                  /* merge server configuration */
+
+    ngx_http_auth_basic_create_loc_conf,   /* create location configuration */
+    ngx_http_auth_basic_merge_loc_conf     /* merge location configuration */
+};
+
+
+ngx_module_t  ngx_http_auth_basic_module = {
+    NGX_MODULE,
+    &ngx_http_auth_basic_module_ctx,       /* module context */
+    ngx_http_auth_basic_commands,          /* module directives */
+    NGX_HTTP_MODULE,                       /* module type */
+    ngx_http_auth_basic_init,              /* init module */
+    NULL                                   /* init process */
+};
+
+
+static ngx_int_t
+ngx_http_auth_basic_handler(ngx_http_request_t *r)
+{
+    off_t                            offset;
+    ssize_t                          n;
+    ngx_fd_t                         fd;
+    ngx_str_t                        auth, encoded, pwd;
+    ngx_uint_t                       i, login, len, left, passwd;
+    ngx_file_t                       file;
+    ngx_http_auth_basic_ctx_t       *ctx;
+    ngx_http_auth_basic_loc_conf_t  *alcf;
+    u_char                           buf[NGX_HTTP_AUTH_BUF_SIZE];
+    enum {
+        sw_login,
+        sw_passwd,
+        sw_skip
+    } state;
+
+    alcf = ngx_http_get_module_loc_conf(r, ngx_http_auth_basic_module);
+
+    if (alcf->realm.len == 0 || alcf->user_file.len == 0) {
+        return NGX_OK;
+    }
+
+    ctx = ngx_http_get_module_ctx(r, ngx_http_auth_basic_module);
+
+    if (ctx) {
+        return ngx_http_auth_basic_crypt_handler(r, ctx, &ctx->passwd,
+                                                 &alcf->realm);
+    }
+
+    if (r->headers_in.authorization == NULL) {
+        return ngx_http_auth_basic_set_realm(r, &alcf->realm);
+    }
+
+    encoded = r->headers_in.authorization->value;
+
+    if (encoded.len < sizeof("Basic ") - 1
+        || ngx_strncasecmp(encoded.data, "Basic ", sizeof("Basic ") - 1) != 0)
+    {
+        return ngx_http_auth_basic_set_realm(r, &alcf->realm);
+    }
+
+    encoded.len -= sizeof("Basic ") - 1;
+    encoded.data += sizeof("Basic ") - 1;
+
+    while (encoded.len && encoded.data[0] == ' ') {
+        encoded.len--;
+        encoded.data++;
+    }
+
+    if (encoded.len == 0) {
+        return ngx_http_auth_basic_set_realm(r, &alcf->realm);
+    }
+
+    auth.len = ngx_base64_decoded_length(encoded.len);
+    auth.data = ngx_palloc(r->pool, auth.len + 1);
+    if (auth.data == NULL) {
+        return NGX_HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    if (ngx_decode_base64(&auth, &encoded) != NGX_OK) {
+        return ngx_http_auth_basic_set_realm(r, &alcf->realm);
+    }
+
+    auth.data[auth.len] = '\0';
+
+    for (len = 0; len < auth.len; len++) {
+        if (auth.data[len] == ':') {
+            break;
+        }
+    }
+
+    if (len == auth.len) {
+        return ngx_http_auth_basic_set_realm(r, &alcf->realm);
+    }
+
+    r->headers_in.user.len = len;
+    r->headers_in.user.data = auth.data;
+    r->headers_in.passwd.len = auth.len - len - 1;
+    r->headers_in.passwd.data = &auth.data[len + 1];
+
+    fd = ngx_open_file(alcf->user_file.data, NGX_FILE_RDONLY, NGX_FILE_OPEN);
+
+    if (fd == NGX_INVALID_FILE) {
+        ngx_log_error(NGX_LOG_ERR, r->connection->log, ngx_errno,
+                      ngx_open_file_n " \"%s\" failed", alcf->user_file.data);
+        return NGX_HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    ngx_memzero(&file, sizeof(ngx_file_t));
+
+    file.fd = fd;
+    file.name = alcf->user_file;
+    file.log = r->connection->log;
+
+    state = sw_login;
+    passwd = 0;
+    login = 0;
+    left = 0;
+    offset = 0;
+
+    for ( ;; ) {
+        n = ngx_read_file(&file, buf + left, NGX_HTTP_AUTH_BUF_SIZE - left,
+                          offset);
+
+        if (n == NGX_ERROR) {
+            ngx_http_auth_basic_close(&file);
+            return NGX_HTTP_INTERNAL_SERVER_ERROR;
+        }
+
+        if (n == 0) {
+            break;
+        }
+
+        for (i = left; i < left + n; i++) {
+            switch (state) {
+
+            case sw_login:
+                if (login == 0 && buf[i] == '#') {
+                    state = sw_skip;
+                    break;
+                }
+
+                if (buf[i] != auth.data[login]) {
+                    state = sw_skip;
+                    break;
+                }
+
+                if (login == len) {
+                    state = sw_passwd;
+                    passwd = i + 1;
+                }
+
+                login++;
+
+                break;
+
+            case sw_passwd:
+                if (buf[i] == LF || buf[i] == CR || buf[i] == ':') {
+                    buf[i] = '\0';
+
+                    ngx_http_auth_basic_close(&file);
+
+                    pwd.len = i - passwd;
+                    pwd.data = &buf[passwd];
+
+                    return ngx_http_auth_basic_crypt_handler(r, NULL, &pwd,
+                                                             &alcf->realm);
+                }
+
+                break;
+
+            case sw_skip:
+                if (buf[i] == LF) {
+                    state = sw_login;
+                    login = 0;
+                }
+
+                break;
+            }
+        }
+
+        if (state == sw_passwd) {
+            left = left + n - passwd;
+            ngx_memcpy(buf, &buf[passwd], left);
+            passwd = 0;
+
+        } else {
+            left = 0;
+        }
+
+        offset += n;
+    }
+
+    ngx_http_auth_basic_close(&file);
+
+    return ngx_http_auth_basic_set_realm(r, &alcf->realm);
+}
+
+
+static ngx_int_t
+ngx_http_auth_basic_crypt_handler(ngx_http_request_t *r,
+    ngx_http_auth_basic_ctx_t *ctx, ngx_str_t *passwd, ngx_str_t *realm)
+{
+    ngx_int_t   rc;
+    u_char     *encrypted;
+
+    rc = ngx_crypt(r->pool, r->headers_in.passwd.data, passwd->data,
+                   &encrypted);
+
+    ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                  "rc: %d user: \"%V\" salt: \"%s\"",
+                  rc, &r->headers_in.user, passwd->data);
+
+    if (rc == NGX_OK) {
+        if (ngx_strcmp(encrypted, passwd->data) == 0) {
+            return NGX_OK;
+        }
+
+        ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                       "encrypted: \"%s\"", encrypted);
+
+        return ngx_http_auth_basic_set_realm(r, realm);
+    }
+
+    if (rc == NGX_ERROR) {
+        return NGX_HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    /* rc == NGX_AGAIN */
+
+    if (ctx == NULL) {
+        ctx = ngx_palloc(r->pool, sizeof(ngx_http_auth_basic_ctx_t));
+        if (ctx == NULL) {
+            return NGX_HTTP_INTERNAL_SERVER_ERROR;
+        }
+
+        ngx_http_set_ctx(r, ctx, ngx_http_auth_basic_module);
+
+        ctx->passwd.len = passwd->len;
+        passwd->len++;
+
+        ctx->passwd.data = ngx_pstrdup(r->pool, passwd);
+        if (ctx->passwd.data == NULL) {
+            return NGX_HTTP_INTERNAL_SERVER_ERROR;
+        }
+
+    }
+
+    /* TODO: add mutex event */
+
+    return rc;
+}
+
+
+static ngx_int_t
+ngx_http_auth_basic_set_realm(ngx_http_request_t *r, ngx_str_t *realm)
+{
+    r->headers_out.www_authenticate = ngx_list_push(&r->headers_out.headers);
+    if (r->headers_out.www_authenticate == NULL) {
+        return NGX_HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    r->headers_out.www_authenticate->key.len = sizeof("WWW-Authenticate") - 1;
+    r->headers_out.www_authenticate->key.data = (u_char *) "WWW-Authenticate";
+    r->headers_out.www_authenticate->value = *realm;
+
+    return NGX_HTTP_UNAUTHORIZED;
+}
+
+static void
+ngx_http_auth_basic_close(ngx_file_t *file)
+{
+    if (ngx_close_file(file->fd) == NGX_FILE_ERROR) {
+        ngx_log_error(NGX_LOG_ALERT, file->log, ngx_errno,
+                      ngx_close_file_n " \"%s\" failed", file->name.data);
+    }
+}
+
+
+static void *
+ngx_http_auth_basic_create_loc_conf(ngx_conf_t *cf)
+{
+    ngx_http_auth_basic_loc_conf_t  *conf;
+
+    conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_auth_basic_loc_conf_t));
+    if (conf == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    return conf;
+}
+
+
+static char *
+ngx_http_auth_basic_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
+{
+    ngx_http_auth_basic_loc_conf_t  *prev = parent;
+    ngx_http_auth_basic_loc_conf_t  *conf = child;
+
+    size_t   len;
+    u_char  *realm, *p;
+
+    if (conf->realm.data) {
+        if (conf->realm.len) {
+            len = sizeof("Basic realm=\"") - 1 + conf->realm.len + 1;
+
+            realm = ngx_palloc(cf->pool, len);
+            if (realm == NULL) {
+                return NGX_CONF_ERROR;
+            }
+
+            p = ngx_cpymem(realm, "Basic realm=\"",
+                           sizeof("Basic realm=\"") - 1);
+            p = ngx_cpymem(p, conf->realm.data, conf->realm.len);
+            *p = '"';
+
+            conf->realm.len = len;
+            conf->realm.data = realm;
+        }
+
+    } else {
+        conf->realm = prev->realm;
+    }
+
+
+    if (conf->user_file.data) {
+        if (ngx_conf_full_name(cf->cycle, &conf->user_file) != NGX_OK) {
+            return NGX_CONF_ERROR;
+        }
+
+    } else {
+        conf->user_file = prev->user_file;
+    }
+
+    return NGX_CONF_OK;
+}
+
+
+static ngx_int_t
+ngx_http_auth_basic_init(ngx_cycle_t *cycle)
+{
+    ngx_http_handler_pt        *h;
+    ngx_http_core_main_conf_t  *cmcf;
+
+    cmcf = ngx_http_cycle_get_module_main_conf(cycle, ngx_http_core_module);
+
+    h = ngx_array_push(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers);
+    if (h == NULL) {
+        return NGX_ERROR;
+    }
+
+    *h = ngx_http_auth_basic_handler;
+
+    return NGX_OK;
+}
+
+
+static char *
+ngx_http_auth_basic(ngx_conf_t *cf, void *post, void *data)
+{
+    ngx_str_t  *realm = data;
+
+    if (ngx_strcmp(realm->data, "off") == 0) {
+        realm->len = 0;
+        realm->data = (u_char *) "";
+    }
+
+    return NGX_CONF_OK;
+}