/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include #include #include #include static ngx_int_t ngx_http_send_error_page(ngx_http_request_t *r, ngx_http_err_page_t *err_page); static ngx_int_t ngx_http_send_special_response(ngx_http_request_t *r, ngx_http_core_loc_conf_t *clcf, ngx_uint_t err); static ngx_int_t ngx_http_send_refresh(ngx_http_request_t *r); static u_char ngx_http_error_full_tail[] = "

" NGINX_VER "" CRLF "" CRLF "" CRLF ; static u_char ngx_http_error_tail[] = "

nginx" CRLF "" CRLF "" CRLF ; static u_char ngx_http_msie_padding[] = "" CRLF "" CRLF "" CRLF "" CRLF "" CRLF "" CRLF ; static u_char ngx_http_msie_refresh_head[] = "" CRLF; static char ngx_http_error_301_page[] = "" CRLF "301 Moved Permanently" CRLF "" CRLF "

301 Moved Permanently

" CRLF ; static char ngx_http_error_302_page[] = "" CRLF "302 Found" CRLF "" CRLF "

302 Found

" CRLF ; static char ngx_http_error_303_page[] = "" CRLF "303 See Other" CRLF "" CRLF "

303 See Other

" CRLF ; static char ngx_http_error_307_page[] = "" CRLF "307 Temporary Redirect" CRLF "" CRLF "

307 Temporary Redirect

" CRLF ; static char ngx_http_error_400_page[] = "" CRLF "400 Bad Request" CRLF "" CRLF "

400 Bad Request

" CRLF ; static char ngx_http_error_401_page[] = "" CRLF "401 Authorization Required" CRLF "" CRLF "

401 Authorization Required

" CRLF ; static char ngx_http_error_402_page[] = "" CRLF "402 Payment Required" CRLF "" CRLF "

402 Payment Required

" CRLF ; static char ngx_http_error_403_page[] = "" CRLF "403 Forbidden" CRLF "" CRLF "

403 Forbidden

" CRLF ; static char ngx_http_error_404_page[] = "" CRLF "404 Not Found" CRLF "" CRLF "

404 Not Found

" CRLF ; static char ngx_http_error_405_page[] = "" CRLF "405 Not Allowed" CRLF "" CRLF "

405 Not Allowed

" CRLF ; static char ngx_http_error_406_page[] = "" CRLF "406 Not Acceptable" CRLF "" CRLF "

406 Not Acceptable

" CRLF ; static char ngx_http_error_408_page[] = "" CRLF "408 Request Time-out" CRLF "" CRLF "

408 Request Time-out

" CRLF ; static char ngx_http_error_409_page[] = "" CRLF "409 Conflict" CRLF "" CRLF "

409 Conflict

" CRLF ; static char ngx_http_error_410_page[] = "" CRLF "410 Gone" CRLF "" CRLF "

410 Gone

" CRLF ; static char ngx_http_error_411_page[] = "" CRLF "411 Length Required" CRLF "" CRLF "

411 Length Required

" CRLF ; static char ngx_http_error_412_page[] = "" CRLF "412 Precondition Failed" CRLF "" CRLF "

412 Precondition Failed

" CRLF ; static char ngx_http_error_413_page[] = "" CRLF "413 Request Entity Too Large" CRLF "" CRLF "

413 Request Entity Too Large

" CRLF ; static char ngx_http_error_414_page[] = "" CRLF "414 Request-URI Too Large" CRLF "" CRLF "

414 Request-URI Too Large

" CRLF ; static char ngx_http_error_415_page[] = "" CRLF "415 Unsupported Media Type" CRLF "" CRLF "

415 Unsupported Media Type

" CRLF ; static char ngx_http_error_416_page[] = "" CRLF "416 Requested Range Not Satisfiable" CRLF "" CRLF "

416 Requested Range Not Satisfiable

" CRLF ; static char ngx_http_error_494_page[] = "" CRLF "400 Request Header Or Cookie Too Large" CRLF "" CRLF "

400 Bad Request

" CRLF "Request Header Or Cookie Too Large" CRLF ; static char ngx_http_error_495_page[] = "" CRLF "400 The SSL certificate error" CRLF "" CRLF "

400 Bad Request

" CRLF "The SSL certificate error" CRLF ; static char ngx_http_error_496_page[] = "" CRLF "400 No required SSL certificate was sent" CRLF "" CRLF "

400 Bad Request

" CRLF "No required SSL certificate was sent" CRLF ; static char ngx_http_error_497_page[] = "" CRLF "400 The plain HTTP request was sent to HTTPS port" CRLF "" CRLF "

400 Bad Request

" CRLF "The plain HTTP request was sent to HTTPS port" CRLF ; static char ngx_http_error_500_page[] = "" CRLF "500 Internal Server Error" CRLF "" CRLF "

500 Internal Server Error

" CRLF ; static char ngx_http_error_501_page[] = "" CRLF "501 Not Implemented" CRLF "" CRLF "

501 Not Implemented

" CRLF ; static char ngx_http_error_502_page[] = "" CRLF "502 Bad Gateway" CRLF "" CRLF "

502 Bad Gateway

" CRLF ; static char ngx_http_error_503_page[] = "" CRLF "503 Service Temporarily Unavailable" CRLF "" CRLF "

503 Service Temporarily Unavailable

" CRLF ; static char ngx_http_error_504_page[] = "" CRLF "504 Gateway Time-out" CRLF "" CRLF "

504 Gateway Time-out

" CRLF ; static char ngx_http_error_507_page[] = "" CRLF "507 Insufficient Storage" CRLF "" CRLF "

507 Insufficient Storage

" CRLF ; static ngx_str_t ngx_http_error_pages[] = { ngx_null_string, /* 201, 204 */ #define NGX_HTTP_LAST_2XX 202 #define NGX_HTTP_OFF_3XX (NGX_HTTP_LAST_2XX - 201) /* ngx_null_string, */ /* 300 */ ngx_string(ngx_http_error_301_page), ngx_string(ngx_http_error_302_page), ngx_string(ngx_http_error_303_page), ngx_null_string, /* 304 */ ngx_null_string, /* 305 */ ngx_null_string, /* 306 */ ngx_string(ngx_http_error_307_page), #define NGX_HTTP_LAST_3XX 308 #define NGX_HTTP_OFF_4XX (NGX_HTTP_LAST_3XX - 301 + NGX_HTTP_OFF_3XX) ngx_string(ngx_http_error_400_page), ngx_string(ngx_http_error_401_page), ngx_string(ngx_http_error_402_page), ngx_string(ngx_http_error_403_page), ngx_string(ngx_http_error_404_page), ngx_string(ngx_http_error_405_page), ngx_string(ngx_http_error_406_page), ngx_null_string, /* 407 */ ngx_string(ngx_http_error_408_page), ngx_string(ngx_http_error_409_page), ngx_string(ngx_http_error_410_page), ngx_string(ngx_http_error_411_page), ngx_string(ngx_http_error_412_page), ngx_string(ngx_http_error_413_page), ngx_string(ngx_http_error_414_page), ngx_string(ngx_http_error_415_page), ngx_string(ngx_http_error_416_page), #define NGX_HTTP_LAST_4XX 417 #define NGX_HTTP_OFF_5XX (NGX_HTTP_LAST_4XX - 400 + NGX_HTTP_OFF_4XX) ngx_string(ngx_http_error_494_page), /* 494, request header too large */ ngx_string(ngx_http_error_495_page), /* 495, https certificate error */ ngx_string(ngx_http_error_496_page), /* 496, https no certificate */ ngx_string(ngx_http_error_497_page), /* 497, http to https */ ngx_string(ngx_http_error_404_page), /* 498, canceled */ ngx_null_string, /* 499, client has closed connection */ ngx_string(ngx_http_error_500_page), ngx_string(ngx_http_error_501_page), ngx_string(ngx_http_error_502_page), ngx_string(ngx_http_error_503_page), ngx_string(ngx_http_error_504_page), ngx_null_string, /* 505 */ ngx_null_string, /* 506 */ ngx_string(ngx_http_error_507_page) #define NGX_HTTP_LAST_5XX 508 }; static ngx_str_t ngx_http_get_name = { 3, (u_char *) "GET " }; ngx_int_t ngx_http_special_response_handler(ngx_http_request_t *r, ngx_int_t error) { ngx_uint_t i, err; ngx_http_err_page_t *err_page; ngx_http_core_loc_conf_t *clcf; ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http special response: %d, \"%V?%V\"", error, &r->uri, &r->args); r->err_status = error; if (r->keepalive) { switch (error) { case NGX_HTTP_BAD_REQUEST: case NGX_HTTP_REQUEST_ENTITY_TOO_LARGE: case NGX_HTTP_REQUEST_URI_TOO_LARGE: case NGX_HTTP_TO_HTTPS: case NGX_HTTPS_CERT_ERROR: case NGX_HTTPS_NO_CERT: case NGX_HTTP_INTERNAL_SERVER_ERROR: case NGX_HTTP_NOT_IMPLEMENTED: r->keepalive = 0; } } if (r->lingering_close) { switch (error) { case NGX_HTTP_BAD_REQUEST: case NGX_HTTP_TO_HTTPS: case NGX_HTTPS_CERT_ERROR: case NGX_HTTPS_NO_CERT: r->lingering_close = 0; } } r->headers_out.content_type.len = 0; clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); if (!r->error_page && clcf->error_pages && r->uri_changes != 0) { if (clcf->recursive_error_pages == 0) { r->error_page = 1; } err_page = clcf->error_pages->elts; for (i = 0; i < clcf->error_pages->nelts; i++) { if (err_page[i].status == error) { return ngx_http_send_error_page(r, &err_page[i]); } } } r->expect_tested = 1; if (ngx_http_discard_request_body(r) != NGX_OK) { error = NGX_HTTP_INTERNAL_SERVER_ERROR; } if (clcf->msie_refresh && r->headers_in.msie && (error == NGX_HTTP_MOVED_PERMANENTLY || error == NGX_HTTP_MOVED_TEMPORARILY)) { return ngx_http_send_refresh(r); } if (error == NGX_HTTP_CREATED) { /* 201 */ err = 0; } else if (error == NGX_HTTP_NO_CONTENT) { /* 204 */ err = 0; } else if (error >= NGX_HTTP_MOVED_PERMANENTLY && error < NGX_HTTP_LAST_3XX) { /* 3XX */ err = error - NGX_HTTP_MOVED_PERMANENTLY + NGX_HTTP_OFF_3XX; } else if (error >= NGX_HTTP_BAD_REQUEST && error < NGX_HTTP_LAST_4XX) { /* 4XX */ err = error - NGX_HTTP_BAD_REQUEST + NGX_HTTP_OFF_4XX; } else if (error >= NGX_HTTP_NGINX_CODES && error < NGX_HTTP_LAST_5XX) { /* 49X, 5XX */ err = error - NGX_HTTP_NGINX_CODES + NGX_HTTP_OFF_5XX; switch (error) { case NGX_HTTP_TO_HTTPS: case NGX_HTTPS_CERT_ERROR: case NGX_HTTPS_NO_CERT: case NGX_HTTP_REQUEST_HEADER_TOO_LARGE: r->err_status = NGX_HTTP_BAD_REQUEST; break; } } else { /* unknown code, zero body */ err = 0; } return ngx_http_send_special_response(r, clcf, err); } ngx_int_t ngx_http_filter_finalize_request(ngx_http_request_t *r, ngx_module_t *m, ngx_int_t error) { void *ctx; ngx_int_t rc; ngx_http_clean_header(r); ctx = NULL; if (m) { ctx = r->ctx[m->ctx_index]; } /* clear the modules contexts */ ngx_memzero(r->ctx, sizeof(void *) * ngx_http_max_module); if (m) { r->ctx[m->ctx_index] = ctx; } r->filter_finalize = 1; rc = ngx_http_special_response_handler(r, error); /* NGX_ERROR resets any pending data */ switch (rc) { case NGX_OK: case NGX_DONE: return NGX_ERROR; default: return rc; } } void ngx_http_clean_header(ngx_http_request_t *r) { ngx_memzero(&r->headers_out.status, sizeof(ngx_http_headers_out_t) - offsetof(ngx_http_headers_out_t, status)); r->headers_out.headers.part.nelts = 0; r->headers_out.headers.part.next = NULL; r->headers_out.headers.last = &r->headers_out.headers.part; r->headers_out.content_length_n = -1; r->headers_out.last_modified_time = -1; } static ngx_int_t ngx_http_send_error_page(ngx_http_request_t *r, ngx_http_err_page_t *err_page) { ngx_int_t overwrite; ngx_str_t uri, args; ngx_table_elt_t *location; ngx_http_core_loc_conf_t *clcf; overwrite = err_page->overwrite; if (overwrite && overwrite != NGX_HTTP_OK) { r->expect_tested = 1; } if (overwrite >= 0) { r->err_status = overwrite; } if (ngx_http_complex_value(r, &err_page->value, &uri) != NGX_OK) { return NGX_ERROR; } if (uri.data[0] == '/') { if (err_page->value.lengths) { ngx_http_split_args(r, &uri, &args); } else { args = err_page->args; } if (r->method != NGX_HTTP_HEAD) { r->method = NGX_HTTP_GET; r->method_name = ngx_http_get_name; } return ngx_http_internal_redirect(r, &uri, &args); } if (uri.data[0] == '@') { return ngx_http_named_location(r, &uri); } location = ngx_list_push(&r->headers_out.headers); if (location == NULL) { return NGX_ERROR; } if (overwrite != NGX_HTTP_MOVED_PERMANENTLY && overwrite != NGX_HTTP_MOVED_TEMPORARILY && overwrite != NGX_HTTP_SEE_OTHER && overwrite != NGX_HTTP_TEMPORARY_REDIRECT) { r->err_status = NGX_HTTP_MOVED_TEMPORARILY; } location->hash = 1; ngx_str_set(&location->key, "Location"); location->value = uri; ngx_http_clear_location(r); r->headers_out.location = location; clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); if (clcf->msie_refresh && r->headers_in.msie) { return ngx_http_send_refresh(r); } return ngx_http_send_special_response(r, clcf, r->err_status - NGX_HTTP_MOVED_PERMANENTLY + NGX_HTTP_OFF_3XX); } static ngx_int_t ngx_http_send_special_response(ngx_http_request_t *r, ngx_http_core_loc_conf_t *clcf, ngx_uint_t err) { u_char *tail; size_t len; ngx_int_t rc; ngx_buf_t *b; ngx_uint_t msie_padding; ngx_chain_t out[3]; if (clcf->server_tokens) { len = sizeof(ngx_http_error_full_tail) - 1; tail = ngx_http_error_full_tail; } else { len = sizeof(ngx_http_error_tail) - 1; tail = ngx_http_error_tail; } msie_padding = 0; if (ngx_http_error_pages[err].len) { r->headers_out.content_length_n = ngx_http_error_pages[err].len + len; if (clcf->msie_padding && (r->headers_in.msie || r->headers_in.chrome) && r->http_version >= NGX_HTTP_VERSION_10 && err >= NGX_HTTP_OFF_4XX) { r->headers_out.content_length_n += sizeof(ngx_http_msie_padding) - 1; msie_padding = 1; } r->headers_out.content_type_len = sizeof("text/html") - 1; ngx_str_set(&r->headers_out.content_type, "text/html"); r->headers_out.content_type_lowcase = NULL; } else { r->headers_out.content_length_n = 0; } if (r->headers_out.content_length) { r->headers_out.content_length->hash = 0; r->headers_out.content_length = NULL; } ngx_http_clear_accept_ranges(r); ngx_http_clear_last_modified(r); rc = ngx_http_send_header(r); if (rc == NGX_ERROR || r->header_only) { return rc; } if (ngx_http_error_pages[err].len == 0) { return ngx_http_send_special(r, NGX_HTTP_LAST); } b = ngx_calloc_buf(r->pool); if (b == NULL) { return NGX_ERROR; } b->memory = 1; b->pos = ngx_http_error_pages[err].data; b->last = ngx_http_error_pages[err].data + ngx_http_error_pages[err].len; out[0].buf = b; out[0].next = &out[1]; b = ngx_calloc_buf(r->pool); if (b == NULL) { return NGX_ERROR; } b->memory = 1; b->pos = tail; b->last = tail + len; out[1].buf = b; out[1].next = NULL; if (msie_padding) { b = ngx_calloc_buf(r->pool); if (b == NULL) { return NGX_ERROR; } b->memory = 1; b->pos = ngx_http_msie_padding; b->last = ngx_http_msie_padding + sizeof(ngx_http_msie_padding) - 1; out[1].next = &out[2]; out[2].buf = b; out[2].next = NULL; } if (r == r->main) { b->last_buf = 1; } b->last_in_chain = 1; return ngx_http_output_filter(r, &out[0]); } static ngx_int_t ngx_http_send_refresh(ngx_http_request_t *r) { u_char *p, *location; size_t len, size; uintptr_t escape; ngx_int_t rc; ngx_buf_t *b; ngx_chain_t out; len = r->headers_out.location->value.len; location = r->headers_out.location->value.data; escape = 2 * ngx_escape_uri(NULL, location, len, NGX_ESCAPE_REFRESH); size = sizeof(ngx_http_msie_refresh_head) - 1 + escape + len + sizeof(ngx_http_msie_refresh_tail) - 1; r->err_status = NGX_HTTP_OK; r->headers_out.content_type_len = sizeof("text/html") - 1; ngx_str_set(&r->headers_out.content_type, "text/html"); r->headers_out.content_type_lowcase = NULL; r->headers_out.location->hash = 0; r->headers_out.location = NULL; r->headers_out.content_length_n = size; if (r->headers_out.content_length) { r->headers_out.content_length->hash = 0; r->headers_out.content_length = NULL; } ngx_http_clear_accept_ranges(r); ngx_http_clear_last_modified(r); rc = ngx_http_send_header(r); if (rc == NGX_ERROR || r->header_only) { return rc; } b = ngx_create_temp_buf(r->pool, size); if (b == NULL) { return NGX_ERROR; } p = ngx_cpymem(b->pos, ngx_http_msie_refresh_head, sizeof(ngx_http_msie_refresh_head) - 1); if (escape == 0) { p = ngx_cpymem(p, location, len); } else { p = (u_char *) ngx_escape_uri(p, location, len, NGX_ESCAPE_REFRESH); } b->last = ngx_cpymem(p, ngx_http_msie_refresh_tail, sizeof(ngx_http_msie_refresh_tail) - 1); b->last_buf = 1; b->last_in_chain = 1; out.buf = b; out.next = NULL; return ngx_http_output_filter(r, &out); }