1 /* 2 * http_cgi - Common Gateway Interface (CGI) interfaces (RFC 3875) 3 * 4 * Copyright(c) 2016-2017 Glenn Strauss gstrauss()gluelogic.com All rights reserved 5 * License: BSD 3-clause (same as lighttpd) 6 */ 7 #include "first.h" 8 9 #include "http_cgi.h" 10 11 #include "sys-socket.h" 12 #include <string.h> 13 14 #include "base.h" 15 #include "array.h" 16 #include "buffer.h" 17 #include "chunk.h" 18 #include "log.h" 19 #include "http_header.h" 20 #include "sock_addr.h" 21 22 handler_t 23 http_cgi_local_redir (request_st * const r) 24 { 25 /* [RFC3875] The Common Gateway Interface (CGI) Version 1.1 26 * [RFC3875] 6.2.2 Local Redirect Response 27 * 28 * The CGI script can return a URI path and query-string 29 * ('local-pathquery') for a local resource in a Location header field. 30 * This indicates to the server that it should reprocess the request 31 * using the path specified. 32 * 33 * local-redir-response = local-Location NL 34 * 35 * The script MUST NOT return any other header fields or a message-body, 36 * and the server MUST generate the response that it would have produced 37 * in response to a request containing the URL 38 * 39 * scheme "://" server-name ":" server-port local-pathquery 40 * 41 * (While not required by the RFC, do not send local-redir back to same URL 42 * since CGI should have handled it internally if it really wanted to do 43 * that internally) 44 */ 45 46 size_t ulen = buffer_string_length(&r->uri.path); 47 const buffer *vb = http_header_response_get(r, HTTP_HEADER_LOCATION, 48 CONST_STR_LEN("Location")); 49 if (NULL != vb 50 && vb->ptr[0] == '/' 51 && (0 != strncmp(vb->ptr, r->uri.path.ptr, ulen) 52 || ( vb->ptr[ulen] != '\0' 53 && vb->ptr[ulen] != '/' 54 && vb->ptr[ulen] != '?')) 55 && 1 == r->resp_headers.used /*"Location"; no "Status" or NPH response*/ 56 && r->http_status >= 300 && r->http_status < 400) { 57 if (++r->loops_per_request > 5) { 58 log_error(r->conf.errh, __FILE__, __LINE__, 59 "too many internal loops while processing request: %s", 60 r->target_orig.ptr); 61 r->http_status = 500; /* Internal Server Error */ 62 r->resp_body_started = 0; 63 r->handler_module = NULL; 64 return HANDLER_FINISHED; 65 } 66 67 buffer_copy_buffer(&r->target, vb); 68 69 if (r->reqbody_length) { 70 if (r->reqbody_length != r->reqbody_queue.bytes_in) 71 r->keep_alive = 0; 72 r->reqbody_length = 0; 73 chunkqueue_reset(&r->reqbody_queue); 74 } 75 76 if (r->http_status != 307 && r->http_status != 308) { 77 /* Note: request body (if any) sent to initial dynamic handler 78 * and is not available to the internal redirect */ 79 r->http_method = HTTP_METHOD_GET; 80 } 81 82 /*(caller must reset request as follows)*/ 83 /*http_response_reset(r);*/ /*(sets r->http_status = 0)*/ 84 /*plugins_call_handle_request_reset(r);*/ 85 86 return HANDLER_COMEBACK; 87 } 88 89 return HANDLER_GO_ON; 90 } 91 92 93 static void 94 http_cgi_encode_varname (buffer * const b, const char * const restrict s, const size_t len, const int is_http_header) 95 { 96 char * const restrict p = buffer_string_prepare_copy(b, len + 5); 97 size_t i, j = 0; 98 99 if (is_http_header) { 100 #if 0 /*(special-cased in caller that sets is_http_header)*/ 101 if (len == 12 && buffer_eq_icase_ssn(s, "Content-Type", 12)) { 102 buffer_copy_string_len(b, CONST_STR_LEN("CONTENT_TYPE")); 103 return; 104 } 105 #endif 106 memcpy(p, "HTTP_", 5); 107 j = 5; /* "HTTP_" */ 108 } 109 110 for (i = 0; i < len; ++i) {/* uppercase alpha, pass numeric, map rest '_' */ 111 const unsigned char c = s[i]; 112 p[j++] = light_isalpha(c) ? c & ~0x20 : light_isdigit(c) ? c : '_'; 113 } 114 buffer_string_set_length(b, j); 115 } 116 117 118 int 119 http_cgi_headers (request_st * const r, http_cgi_opts * const opts, http_cgi_header_append_cb cb, void *vdata) 120 { 121 /* CGI-SPEC 6.1.2, FastCGI spec 6.3 and SCGI spec */ 122 123 /* note: string ptrs passed to cb() func must not be NULL */ 124 125 int rc = 0; 126 uint32_t len; 127 buffer * const tb = r->tmp_buf; 128 const char *s; 129 size_t n; 130 char buf[INET6_ADDRSTRLEN + 1]; /*(also larger than LI_ITOSTRING_LENGTH)*/ 131 132 /* (CONTENT_LENGTH must be first for SCGI) */ 133 if (!opts->authorizer) 134 rc |= cb(vdata, CONST_STR_LEN("CONTENT_LENGTH"), 135 buf, li_itostrn(buf,sizeof(buf),r->reqbody_length)); 136 137 n = buffer_string_length(&r->uri.query); 138 rc |= cb(vdata, CONST_STR_LEN("QUERY_STRING"), 139 n ? r->uri.query.ptr : "", n); 140 141 s = r->target_orig.ptr; 142 n = buffer_string_length(&r->target_orig); 143 len = buffer_string_length(opts->strip_request_uri); 144 if (len) { 145 /* e.g. /app1/index/list 146 * stripping /app1 or /app1/ should lead to /index/list 147 * (trailing slash removed from strip_request_uri at config time)*/ 148 if (n < len || 0 != memcmp(s, opts->strip_request_uri->ptr, len) 149 || s[len] != '/') 150 len = 0; 151 } 152 rc |= cb(vdata, CONST_STR_LEN("REQUEST_URI"), s+len, n-len); 153 154 if (!buffer_is_equal(&r->target, &r->target_orig)) 155 rc |= cb(vdata, CONST_STR_LEN("REDIRECT_URI"), 156 CONST_BUF_LEN(&r->target)); 157 158 /* set REDIRECT_STATUS for php compiled with --force-redirect 159 * (if REDIRECT_STATUS has not already been set by error handler) */ 160 if (0 == r->error_handler_saved_status) 161 rc |= cb(vdata, CONST_STR_LEN("REDIRECT_STATUS"), 162 CONST_STR_LEN("200")); 163 164 /* 165 * SCRIPT_NAME, PATH_INFO and PATH_TRANSLATED according to 166 * http://cgi-spec.golux.com/draft-coar-cgi-v11-03-clean.html 167 * (6.1.14, 6.1.6, 6.1.7) 168 */ 169 if (!opts->authorizer) { 170 rc |= cb(vdata, CONST_STR_LEN("SCRIPT_NAME"), 171 CONST_BUF_LEN(&r->uri.path)); 172 if (!buffer_string_is_empty(&r->pathinfo)) { 173 rc |= cb(vdata, CONST_STR_LEN("PATH_INFO"), 174 CONST_BUF_LEN(&r->pathinfo)); 175 /* PATH_TRANSLATED is only defined if PATH_INFO is set 176 * Note: not implemented: re-url-encode '?' '=' ';' for 177 * (RFC 3875 4.1.6) */ 178 const buffer * const bd = (!buffer_string_is_empty(opts->docroot)) 179 ? opts->docroot 180 : &r->physical.basedir; 181 buffer_copy_path_len2(tb, CONST_BUF_LEN(bd), 182 CONST_BUF_LEN(&r->pathinfo)); 183 rc |= cb(vdata, CONST_STR_LEN("PATH_TRANSLATED"), 184 CONST_BUF_LEN(tb)); 185 } 186 } 187 188 /* 189 * SCRIPT_FILENAME and DOCUMENT_ROOT for php 190 * The PHP manual http://www.php.net/manual/en/reserved.variables.php 191 * treatment of PATH_TRANSLATED is different from the one of CGI specs. 192 * (see php.ini cgi.fix_pathinfo = 1 config parameter) 193 */ 194 195 if (!buffer_string_is_empty(opts->docroot)) { 196 /* alternate docroot, e.g. for remote FastCGI or SCGI server */ 197 buffer_copy_path_len2(tb, CONST_BUF_LEN(opts->docroot), 198 CONST_BUF_LEN(&r->uri.path)); 199 rc |= cb(vdata, CONST_STR_LEN("SCRIPT_FILENAME"), 200 CONST_BUF_LEN(tb)); 201 rc |= cb(vdata, CONST_STR_LEN("DOCUMENT_ROOT"), 202 CONST_BUF_LEN(opts->docroot)); 203 } 204 else { 205 if (opts->break_scriptfilename_for_php) { 206 /* php.ini config cgi.fix_pathinfo = 1 need a broken SCRIPT_FILENAME 207 * to find out what PATH_INFO is itself 208 * 209 * see src/sapi/cgi_main.c, init_request_info() 210 */ 211 buffer_copy_path_len2(tb, CONST_BUF_LEN(&r->physical.path), 212 CONST_BUF_LEN(&r->pathinfo)); 213 rc |= cb(vdata, CONST_STR_LEN("SCRIPT_FILENAME"), 214 CONST_BUF_LEN(tb)); 215 } 216 else 217 rc |= cb(vdata, CONST_STR_LEN("SCRIPT_FILENAME"), 218 CONST_BUF_LEN(&r->physical.path)); 219 rc |= cb(vdata, CONST_STR_LEN("DOCUMENT_ROOT"), 220 CONST_BUF_LEN(&r->physical.basedir)); 221 } 222 223 s = get_http_method_name(r->http_method); 224 force_assert(s); 225 rc |= cb(vdata, CONST_STR_LEN("REQUEST_METHOD"), s, strlen(s)); 226 227 s = get_http_version_name(r->http_version); 228 force_assert(s); 229 rc |= cb(vdata, CONST_STR_LEN("SERVER_PROTOCOL"), s, strlen(s)); 230 231 rc |= cb(vdata, CONST_STR_LEN("SERVER_SOFTWARE"), 232 CONST_BUF_LEN(r->conf.server_tag)); 233 234 rc |= cb(vdata, CONST_STR_LEN("GATEWAY_INTERFACE"), 235 CONST_STR_LEN("CGI/1.1")); 236 237 rc |= cb(vdata, CONST_STR_LEN("REQUEST_SCHEME"), 238 CONST_BUF_LEN(&r->uri.scheme)); 239 240 if (buffer_is_equal_string(&r->uri.scheme, CONST_STR_LEN("https"))) 241 rc |= cb(vdata, CONST_STR_LEN("HTTPS"), CONST_STR_LEN("on")); 242 243 const connection * const con = r->con; 244 const server_socket * const srv_sock = con->srv_socket; 245 const size_t tlen = buffer_string_length(srv_sock->srv_token); 246 n = srv_sock->srv_token_colon; 247 if (n < tlen) { /*(n != tlen)*/ 248 s = srv_sock->srv_token->ptr+n+1; 249 n = tlen - (n+1); 250 } 251 else { 252 s = "0"; 253 n = 1; 254 } 255 rc |= cb(vdata, CONST_STR_LEN("SERVER_PORT"), s, n); 256 257 n = 0; 258 switch (sock_addr_get_family(&srv_sock->addr)) { 259 case AF_INET: 260 case AF_INET6: 261 if (sock_addr_is_addr_wildcard(&srv_sock->addr)) { 262 sock_addr addrbuf; 263 socklen_t addrlen = sizeof(addrbuf); 264 if (0 == getsockname(con->fd,(struct sockaddr *)&addrbuf,&addrlen)){ 265 /* future: might add a one- or two- element cache 266 * or use sock_addr_cache_inet_ntop_copy_buffer() into tb */ 267 s = sock_addr_inet_ntop(&addrbuf, buf, sizeof(buf)); 268 if (s) 269 n = strlen(s); 270 else 271 s = ""; 272 } 273 else 274 s = ""; 275 } 276 else { 277 s = srv_sock->srv_token->ptr; 278 n = srv_sock->srv_token_colon; 279 } 280 break; 281 default: 282 s = ""; 283 break; 284 } 285 rc |= cb(vdata, CONST_STR_LEN("SERVER_ADDR"), s, n); 286 287 n = buffer_string_length(r->server_name); 288 if (n) { 289 s = r->server_name->ptr; 290 if (s[0] == '[') { 291 const char *colon = strstr(s, "]:"); 292 if (colon) n = (colon + 1) - s; 293 } 294 else { 295 const char *colon = strchr(s, ':'); 296 if (colon) n = colon - s; 297 } 298 } /* else set to be same as SERVER_ADDR (above) */ 299 rc |= cb(vdata, CONST_STR_LEN("SERVER_NAME"), s, n); 300 301 rc |= cb(vdata, CONST_STR_LEN("REMOTE_ADDR"), 302 CONST_BUF_LEN(con->dst_addr_buf)); 303 304 rc |= cb(vdata, CONST_STR_LEN("REMOTE_PORT"), buf, 305 li_utostrn(buf,sizeof(buf),sock_addr_get_port(&con->dst_addr))); 306 307 for (n = 0; n < r->rqst_headers.used; n++) { 308 data_string *ds = (data_string *)r->rqst_headers.data[n]; 309 if (!buffer_string_is_empty(&ds->value) && !buffer_is_empty(&ds->key)) { 310 /* Security: Do not emit HTTP_PROXY in environment. 311 * Some executables use HTTP_PROXY to configure 312 * outgoing proxy. See also https://httpoxy.org/ */ 313 if (ds->ext == HTTP_HEADER_OTHER 314 && buffer_eq_icase_slen(&ds->key, CONST_STR_LEN("Proxy"))) { 315 continue; 316 } 317 else if (ds->ext == HTTP_HEADER_CONTENT_TYPE) 318 buffer_copy_string_len(tb, CONST_STR_LEN("CONTENT_TYPE")); 319 else 320 http_cgi_encode_varname(tb, CONST_BUF_LEN(&ds->key), 1); 321 rc |= cb(vdata, CONST_BUF_LEN(tb), 322 CONST_BUF_LEN(&ds->value)); 323 } 324 } 325 326 con->srv->request_env(r); 327 328 for (n = 0; n < r->env.used; n++) { 329 data_string *ds = (data_string *)r->env.data[n]; 330 if (!buffer_is_empty(&ds->value) && !buffer_is_empty(&ds->key)) { 331 http_cgi_encode_varname(tb, CONST_BUF_LEN(&ds->key), 0); 332 rc |= cb(vdata, CONST_BUF_LEN(tb), 333 CONST_BUF_LEN(&ds->value)); 334 } 335 } 336 337 return rc; 338 } 339