| /*************************************************************************** |
| * _ _ ____ _ |
| * Project ___| | | | _ \| | |
| * / __| | | | |_) | | |
| * | (__| |_| | _ <| |___ |
| * \___|\___/|_| \_\_____| |
| * |
| * Copyright (C) 1998 - 2019, Daniel Stenberg, <[email protected]>, et al. |
| * |
| * This software is licensed as described in the file COPYING, which |
| * you should have received as part of this distribution. The terms |
| * are also available at https://curl.haxx.se/docs/copyright.html. |
| * |
| * You may opt to use, copy, modify, merge, publish, distribute and/or sell |
| * copies of the Software, and permit persons to whom the Software is |
| * furnished to do so, under the terms of the COPYING file. |
| * |
| * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
| * KIND, either express or implied. |
| * |
| ***************************************************************************/ |
| |
| #include "curl_setup.h" |
| |
| #include "http_proxy.h" |
| |
| #if !defined(CURL_DISABLE_PROXY) && !defined(CURL_DISABLE_HTTP) |
| |
| #include <curl/curl.h> |
| #include "sendf.h" |
| #include "http.h" |
| #include "url.h" |
| #include "select.h" |
| #include "progress.h" |
| #include "non-ascii.h" |
| #include "connect.h" |
| #include "curlx.h" |
| #include "vtls/vtls.h" |
| |
| /* The last 3 #include files should be in this order */ |
| #include "curl_printf.h" |
| #include "curl_memory.h" |
| #include "memdebug.h" |
| |
| /* |
| * Perform SSL initialization for HTTPS proxy. Sets |
| * proxy_ssl_connected connection bit when complete. Can be |
| * called multiple times. |
| */ |
| static CURLcode https_proxy_connect(struct connectdata *conn, int sockindex) |
| { |
| #ifdef USE_SSL |
| CURLcode result = CURLE_OK; |
| DEBUGASSERT(conn->http_proxy.proxytype == CURLPROXY_HTTPS); |
| if(!conn->bits.proxy_ssl_connected[sockindex]) { |
| /* perform SSL initialization for this socket */ |
| result = |
| Curl_ssl_connect_nonblocking(conn, sockindex, |
| &conn->bits.proxy_ssl_connected[sockindex]); |
| if(result) |
| conn->bits.close = TRUE; /* a failed connection is marked for closure to |
| prevent (bad) re-use or similar */ |
| } |
| return result; |
| #else |
| (void) conn; |
| (void) sockindex; |
| return CURLE_NOT_BUILT_IN; |
| #endif |
| } |
| |
| CURLcode Curl_proxy_connect(struct connectdata *conn, int sockindex) |
| { |
| if(conn->http_proxy.proxytype == CURLPROXY_HTTPS) { |
| const CURLcode result = https_proxy_connect(conn, sockindex); |
| if(result) |
| return result; |
| if(!conn->bits.proxy_ssl_connected[sockindex]) |
| return result; /* wait for HTTPS proxy SSL initialization to complete */ |
| } |
| |
| if(conn->bits.tunnel_proxy && conn->bits.httpproxy) { |
| #ifndef CURL_DISABLE_PROXY |
| /* for [protocol] tunneled through HTTP proxy */ |
| struct HTTP http_proxy; |
| void *prot_save; |
| const char *hostname; |
| int remote_port; |
| CURLcode result; |
| |
| /* BLOCKING */ |
| /* We want "seamless" operations through HTTP proxy tunnel */ |
| |
| /* Curl_proxyCONNECT is based on a pointer to a struct HTTP at the |
| * member conn->proto.http; we want [protocol] through HTTP and we have |
| * to change the member temporarily for connecting to the HTTP |
| * proxy. After Curl_proxyCONNECT we have to set back the member to the |
| * original pointer |
| * |
| * This function might be called several times in the multi interface case |
| * if the proxy's CONNECT response is not instant. |
| */ |
| prot_save = conn->data->req.protop; |
| memset(&http_proxy, 0, sizeof(http_proxy)); |
| conn->data->req.protop = &http_proxy; |
| connkeep(conn, "HTTP proxy CONNECT"); |
| |
| /* for the secondary socket (FTP), use the "connect to host" |
| * but ignore the "connect to port" (use the secondary port) |
| */ |
| |
| if(conn->bits.conn_to_host) |
| hostname = conn->conn_to_host.name; |
| else if(sockindex == SECONDARYSOCKET) |
| hostname = conn->secondaryhostname; |
| else |
| hostname = conn->host.name; |
| |
| if(sockindex == SECONDARYSOCKET) |
| remote_port = conn->secondary_port; |
| else if(conn->bits.conn_to_port) |
| remote_port = conn->conn_to_port; |
| else |
| remote_port = conn->remote_port; |
| result = Curl_proxyCONNECT(conn, sockindex, hostname, remote_port); |
| conn->data->req.protop = prot_save; |
| if(CURLE_OK != result) |
| return result; |
| Curl_safefree(conn->allocptr.proxyuserpwd); |
| #else |
| return CURLE_NOT_BUILT_IN; |
| #endif |
| } |
| /* no HTTP tunnel proxy, just return */ |
| return CURLE_OK; |
| } |
| |
| bool Curl_connect_complete(struct connectdata *conn) |
| { |
| return !conn->connect_state || |
| (conn->connect_state->tunnel_state == TUNNEL_COMPLETE); |
| } |
| |
| bool Curl_connect_ongoing(struct connectdata *conn) |
| { |
| return conn->connect_state && |
| (conn->connect_state->tunnel_state != TUNNEL_COMPLETE); |
| } |
| |
| static CURLcode connect_init(struct connectdata *conn, bool reinit) |
| { |
| struct http_connect_state *s; |
| if(!reinit) { |
| DEBUGASSERT(!conn->connect_state); |
| s = calloc(1, sizeof(struct http_connect_state)); |
| if(!s) |
| return CURLE_OUT_OF_MEMORY; |
| infof(conn->data, "allocate connect buffer!\n"); |
| conn->connect_state = s; |
| } |
| else { |
| DEBUGASSERT(conn->connect_state); |
| s = conn->connect_state; |
| } |
| s->tunnel_state = TUNNEL_INIT; |
| s->keepon = TRUE; |
| s->line_start = s->connect_buffer; |
| s->ptr = s->line_start; |
| s->cl = 0; |
| s->close_connection = FALSE; |
| return CURLE_OK; |
| } |
| |
| static void connect_done(struct connectdata *conn) |
| { |
| struct http_connect_state *s = conn->connect_state; |
| s->tunnel_state = TUNNEL_COMPLETE; |
| infof(conn->data, "CONNECT phase completed!\n"); |
| } |
| |
| static CURLcode CONNECT(struct connectdata *conn, |
| int sockindex, |
| const char *hostname, |
| int remote_port) |
| { |
| int subversion = 0; |
| struct Curl_easy *data = conn->data; |
| struct SingleRequest *k = &data->req; |
| CURLcode result; |
| curl_socket_t tunnelsocket = conn->sock[sockindex]; |
| struct http_connect_state *s = conn->connect_state; |
| |
| #define SELECT_OK 0 |
| #define SELECT_ERROR 1 |
| |
| if(Curl_connect_complete(conn)) |
| return CURLE_OK; /* CONNECT is already completed */ |
| |
| conn->bits.proxy_connect_closed = FALSE; |
| |
| do { |
| timediff_t check; |
| if(TUNNEL_INIT == s->tunnel_state) { |
| /* BEGIN CONNECT PHASE */ |
| char *host_port; |
| Curl_send_buffer *req_buffer; |
| |
| infof(data, "Establish HTTP proxy tunnel to %s:%d\n", |
| hostname, remote_port); |
| |
| /* This only happens if we've looped here due to authentication |
| reasons, and we don't really use the newly cloned URL here |
| then. Just free() it. */ |
| free(data->req.newurl); |
| data->req.newurl = NULL; |
| |
| /* initialize a dynamic send-buffer */ |
| req_buffer = Curl_add_buffer_init(); |
| |
| if(!req_buffer) |
| return CURLE_OUT_OF_MEMORY; |
| |
| host_port = aprintf("%s:%d", hostname, remote_port); |
| if(!host_port) { |
| Curl_add_buffer_free(&req_buffer); |
| return CURLE_OUT_OF_MEMORY; |
| } |
| |
| /* Setup the proxy-authorization header, if any */ |
| result = Curl_http_output_auth(conn, "CONNECT", host_port, TRUE); |
| |
| free(host_port); |
| |
| if(!result) { |
| char *host = NULL; |
| const char *proxyconn = ""; |
| const char *useragent = ""; |
| const char *http = (conn->http_proxy.proxytype == CURLPROXY_HTTP_1_0) ? |
| "1.0" : "1.1"; |
| bool ipv6_ip = conn->bits.ipv6_ip; |
| char *hostheader; |
| |
| /* the hostname may be different */ |
| if(hostname != conn->host.name) |
| ipv6_ip = (strchr(hostname, ':') != NULL); |
| hostheader = /* host:port with IPv6 support */ |
| aprintf("%s%s%s:%d", ipv6_ip?"[":"", hostname, ipv6_ip?"]":"", |
| remote_port); |
| if(!hostheader) { |
| Curl_add_buffer_free(&req_buffer); |
| return CURLE_OUT_OF_MEMORY; |
| } |
| |
| if(!Curl_checkProxyheaders(conn, "Host")) { |
| host = aprintf("Host: %s\r\n", hostheader); |
| if(!host) { |
| free(hostheader); |
| Curl_add_buffer_free(&req_buffer); |
| return CURLE_OUT_OF_MEMORY; |
| } |
| } |
| if(!Curl_checkProxyheaders(conn, "Proxy-Connection")) |
| proxyconn = "Proxy-Connection: Keep-Alive\r\n"; |
| |
| if(!Curl_checkProxyheaders(conn, "User-Agent") && |
| data->set.str[STRING_USERAGENT]) |
| useragent = conn->allocptr.uagent; |
| |
| result = |
| Curl_add_bufferf(&req_buffer, |
| "CONNECT %s HTTP/%s\r\n" |
| "%s" /* Host: */ |
| "%s" /* Proxy-Authorization */ |
| "%s" /* User-Agent */ |
| "%s", /* Proxy-Connection */ |
| hostheader, |
| http, |
| host?host:"", |
| conn->allocptr.proxyuserpwd? |
| conn->allocptr.proxyuserpwd:"", |
| useragent, |
| proxyconn); |
| |
| if(host) |
| free(host); |
| free(hostheader); |
| |
| if(!result) |
| result = Curl_add_custom_headers(conn, TRUE, req_buffer); |
| |
| if(!result) |
| /* CRLF terminate the request */ |
| result = Curl_add_bufferf(&req_buffer, "\r\n"); |
| |
| if(!result) { |
| /* Send the connect request to the proxy */ |
| /* BLOCKING */ |
| result = |
| Curl_add_buffer_send(&req_buffer, conn, |
| &data->info.request_size, 0, sockindex); |
| } |
| req_buffer = NULL; |
| if(result) |
| failf(data, "Failed sending CONNECT to proxy"); |
| } |
| |
| Curl_add_buffer_free(&req_buffer); |
| if(result) |
| return result; |
| |
| s->tunnel_state = TUNNEL_CONNECT; |
| s->perline = 0; |
| } /* END CONNECT PHASE */ |
| |
| check = Curl_timeleft(data, NULL, TRUE); |
| if(check <= 0) { |
| failf(data, "Proxy CONNECT aborted due to timeout"); |
| return CURLE_OPERATION_TIMEDOUT; |
| } |
| |
| if(!Curl_conn_data_pending(conn, sockindex)) |
| /* return so we'll be called again polling-style */ |
| return CURLE_OK; |
| |
| /* at this point, the tunnel_connecting phase is over. */ |
| |
| { /* READING RESPONSE PHASE */ |
| int error = SELECT_OK; |
| |
| while(s->keepon && !error) { |
| ssize_t gotbytes; |
| |
| /* make sure we have space to read more data */ |
| if(s->ptr >= &s->connect_buffer[CONNECT_BUFFER_SIZE]) { |
| failf(data, "CONNECT response too large!"); |
| return CURLE_RECV_ERROR; |
| } |
| |
| /* Read one byte at a time to avoid a race condition. Wait at most one |
| second before looping to ensure continuous pgrsUpdates. */ |
| result = Curl_read(conn, tunnelsocket, s->ptr, 1, &gotbytes); |
| if(result == CURLE_AGAIN) |
| /* socket buffer drained, return */ |
| return CURLE_OK; |
| |
| if(Curl_pgrsUpdate(conn)) |
| return CURLE_ABORTED_BY_CALLBACK; |
| |
| if(result) { |
| s->keepon = FALSE; |
| break; |
| } |
| else if(gotbytes <= 0) { |
| if(data->set.proxyauth && data->state.authproxy.avail) { |
| /* proxy auth was requested and there was proxy auth available, |
| then deem this as "mere" proxy disconnect */ |
| conn->bits.proxy_connect_closed = TRUE; |
| infof(data, "Proxy CONNECT connection closed\n"); |
| } |
| else { |
| error = SELECT_ERROR; |
| failf(data, "Proxy CONNECT aborted"); |
| } |
| s->keepon = FALSE; |
| break; |
| } |
| |
| |
| if(s->keepon > TRUE) { |
| /* This means we are currently ignoring a response-body */ |
| |
| s->ptr = s->connect_buffer; |
| if(s->cl) { |
| /* A Content-Length based body: simply count down the counter |
| and make sure to break out of the loop when we're done! */ |
| s->cl--; |
| if(s->cl <= 0) { |
| s->keepon = FALSE; |
| s->tunnel_state = TUNNEL_COMPLETE; |
| break; |
| } |
| } |
| else { |
| /* chunked-encoded body, so we need to do the chunked dance |
| properly to know when the end of the body is reached */ |
| CHUNKcode r; |
| ssize_t tookcareof = 0; |
| |
| /* now parse the chunked piece of data so that we can |
| properly tell when the stream ends */ |
| r = Curl_httpchunk_read(conn, s->ptr, 1, &tookcareof); |
| if(r == CHUNKE_STOP) { |
| /* we're done reading chunks! */ |
| infof(data, "chunk reading DONE\n"); |
| s->keepon = FALSE; |
| /* we did the full CONNECT treatment, go COMPLETE */ |
| s->tunnel_state = TUNNEL_COMPLETE; |
| } |
| } |
| continue; |
| } |
| |
| s->perline++; /* amount of bytes in this line so far */ |
| |
| /* if this is not the end of a header line then continue */ |
| if(*s->ptr != 0x0a) { |
| s->ptr++; |
| continue; |
| } |
| |
| /* convert from the network encoding */ |
| result = Curl_convert_from_network(data, s->line_start, |
| (size_t)s->perline); |
| /* Curl_convert_from_network calls failf if unsuccessful */ |
| if(result) |
| return result; |
| |
| /* output debug if that is requested */ |
| if(data->set.verbose) |
| Curl_debug(data, CURLINFO_HEADER_IN, |
| s->line_start, (size_t)s->perline); |
| |
| if(!data->set.suppress_connect_headers) { |
| /* send the header to the callback */ |
| int writetype = CLIENTWRITE_HEADER; |
| if(data->set.include_header) |
| writetype |= CLIENTWRITE_BODY; |
| |
| result = Curl_client_write(conn, writetype, |
| s->line_start, s->perline); |
| if(result) |
| return result; |
| } |
| |
| data->info.header_size += (long)s->perline; |
| data->req.headerbytecount += (long)s->perline; |
| |
| /* Newlines are CRLF, so the CR is ignored as the line isn't |
| really terminated until the LF comes. Treat a following CR |
| as end-of-headers as well.*/ |
| |
| if(('\r' == s->line_start[0]) || |
| ('\n' == s->line_start[0])) { |
| /* end of response-headers from the proxy */ |
| s->ptr = s->connect_buffer; |
| if((407 == k->httpcode) && !data->state.authproblem) { |
| /* If we get a 407 response code with content length |
| when we have no auth problem, we must ignore the |
| whole response-body */ |
| s->keepon = 2; |
| |
| if(s->cl) { |
| infof(data, "Ignore %" CURL_FORMAT_CURL_OFF_T |
| " bytes of response-body\n", s->cl); |
| } |
| else if(s->chunked_encoding) { |
| CHUNKcode r; |
| |
| infof(data, "Ignore chunked response-body\n"); |
| |
| /* We set ignorebody true here since the chunked |
| decoder function will acknowledge that. Pay |
| attention so that this is cleared again when this |
| function returns! */ |
| k->ignorebody = TRUE; |
| |
| if(s->line_start[1] == '\n') { |
| /* this can only be a LF if the letter at index 0 |
| was a CR */ |
| s->line_start++; |
| } |
| |
| /* now parse the chunked piece of data so that we can |
| properly tell when the stream ends */ |
| r = Curl_httpchunk_read(conn, s->line_start + 1, 1, &gotbytes); |
| if(r == CHUNKE_STOP) { |
| /* we're done reading chunks! */ |
| infof(data, "chunk reading DONE\n"); |
| s->keepon = FALSE; |
| /* we did the full CONNECT treatment, go to COMPLETE */ |
| s->tunnel_state = TUNNEL_COMPLETE; |
| } |
| } |
| else { |
| /* without content-length or chunked encoding, we |
| can't keep the connection alive since the close is |
| the end signal so we bail out at once instead */ |
| s->keepon = FALSE; |
| } |
| } |
| else |
| s->keepon = FALSE; |
| if(!s->cl) |
| /* we did the full CONNECT treatment, go to COMPLETE */ |
| s->tunnel_state = TUNNEL_COMPLETE; |
| continue; |
| } |
| |
| s->line_start[s->perline] = 0; /* zero terminate the buffer */ |
| if((checkprefix("WWW-Authenticate:", s->line_start) && |
| (401 == k->httpcode)) || |
| (checkprefix("Proxy-authenticate:", s->line_start) && |
| (407 == k->httpcode))) { |
| |
| bool proxy = (k->httpcode == 407) ? TRUE : FALSE; |
| char *auth = Curl_copy_header_value(s->line_start); |
| if(!auth) |
| return CURLE_OUT_OF_MEMORY; |
| |
| result = Curl_http_input_auth(conn, proxy, auth); |
| |
| free(auth); |
| |
| if(result) |
| return result; |
| } |
| else if(checkprefix("Content-Length:", s->line_start)) { |
| if(k->httpcode/100 == 2) { |
| /* A client MUST ignore any Content-Length or Transfer-Encoding |
| header fields received in a successful response to CONNECT. |
| "Successful" described as: 2xx (Successful). RFC 7231 4.3.6 */ |
| infof(data, "Ignoring Content-Length in CONNECT %03d response\n", |
| k->httpcode); |
| } |
| else { |
| (void)curlx_strtoofft(s->line_start + |
| strlen("Content-Length:"), NULL, 10, &s->cl); |
| } |
| } |
| else if(Curl_compareheader(s->line_start, "Connection:", "close")) |
| s->close_connection = TRUE; |
| else if(checkprefix("Transfer-Encoding:", s->line_start)) { |
| if(k->httpcode/100 == 2) { |
| /* A client MUST ignore any Content-Length or Transfer-Encoding |
| header fields received in a successful response to CONNECT. |
| "Successful" described as: 2xx (Successful). RFC 7231 4.3.6 */ |
| infof(data, "Ignoring Transfer-Encoding in " |
| "CONNECT %03d response\n", k->httpcode); |
| } |
| else if(Curl_compareheader(s->line_start, |
| "Transfer-Encoding:", "chunked")) { |
| infof(data, "CONNECT responded chunked\n"); |
| s->chunked_encoding = TRUE; |
| /* init our chunky engine */ |
| Curl_httpchunk_init(conn); |
| } |
| } |
| else if(Curl_compareheader(s->line_start, |
| "Proxy-Connection:", "close")) |
| s->close_connection = TRUE; |
| else if(2 == sscanf(s->line_start, "HTTP/1.%d %d", |
| &subversion, |
| &k->httpcode)) { |
| /* store the HTTP code from the proxy */ |
| data->info.httpproxycode = k->httpcode; |
| } |
| |
| s->perline = 0; /* line starts over here */ |
| s->ptr = s->connect_buffer; |
| s->line_start = s->ptr; |
| } /* while there's buffer left and loop is requested */ |
| |
| if(Curl_pgrsUpdate(conn)) |
| return CURLE_ABORTED_BY_CALLBACK; |
| |
| if(error) |
| return CURLE_RECV_ERROR; |
| |
| if(data->info.httpproxycode/100 != 2) { |
| /* Deal with the possibly already received authenticate |
| headers. 'newurl' is set to a new URL if we must loop. */ |
| result = Curl_http_auth_act(conn); |
| if(result) |
| return result; |
| |
| if(conn->bits.close) |
| /* the connection has been marked for closure, most likely in the |
| Curl_http_auth_act() function and thus we can kill it at once |
| below */ |
| s->close_connection = TRUE; |
| } |
| |
| if(s->close_connection && data->req.newurl) { |
| /* Connection closed by server. Don't use it anymore */ |
| Curl_closesocket(conn, conn->sock[sockindex]); |
| conn->sock[sockindex] = CURL_SOCKET_BAD; |
| break; |
| } |
| } /* END READING RESPONSE PHASE */ |
| |
| /* If we are supposed to continue and request a new URL, which basically |
| * means the HTTP authentication is still going on so if the tunnel |
| * is complete we start over in INIT state */ |
| if(data->req.newurl && (TUNNEL_COMPLETE == s->tunnel_state)) { |
| connect_init(conn, TRUE); /* reinit */ |
| } |
| |
| } while(data->req.newurl); |
| |
| if(data->info.httpproxycode/100 != 2) { |
| if(s->close_connection && data->req.newurl) { |
| conn->bits.proxy_connect_closed = TRUE; |
| infof(data, "Connect me again please\n"); |
| connect_done(conn); |
| } |
| else { |
| free(data->req.newurl); |
| data->req.newurl = NULL; |
| /* failure, close this connection to avoid re-use */ |
| streamclose(conn, "proxy CONNECT failure"); |
| Curl_closesocket(conn, conn->sock[sockindex]); |
| conn->sock[sockindex] = CURL_SOCKET_BAD; |
| } |
| |
| /* to back to init state */ |
| s->tunnel_state = TUNNEL_INIT; |
| |
| if(conn->bits.proxy_connect_closed) |
| /* this is not an error, just part of the connection negotiation */ |
| return CURLE_OK; |
| failf(data, "Received HTTP code %d from proxy after CONNECT", |
| data->req.httpcode); |
| return CURLE_RECV_ERROR; |
| } |
| |
| s->tunnel_state = TUNNEL_COMPLETE; |
| |
| /* If a proxy-authorization header was used for the proxy, then we should |
| make sure that it isn't accidentally used for the document request |
| after we've connected. So let's free and clear it here. */ |
| Curl_safefree(conn->allocptr.proxyuserpwd); |
| conn->allocptr.proxyuserpwd = NULL; |
| |
| data->state.authproxy.done = TRUE; |
| data->state.authproxy.multipass = FALSE; |
| |
| infof(data, "Proxy replied %d to CONNECT request\n", |
| data->info.httpproxycode); |
| data->req.ignorebody = FALSE; /* put it (back) to non-ignore state */ |
| conn->bits.rewindaftersend = FALSE; /* make sure this isn't set for the |
| document request */ |
| return CURLE_OK; |
| } |
| |
| void Curl_connect_free(struct Curl_easy *data) |
| { |
| struct connectdata *conn = data->conn; |
| struct http_connect_state *s = conn->connect_state; |
| if(s) { |
| free(s); |
| conn->connect_state = NULL; |
| } |
| } |
| |
| /* |
| * Curl_proxyCONNECT() requires that we're connected to a HTTP proxy. This |
| * function will issue the necessary commands to get a seamless tunnel through |
| * this proxy. After that, the socket can be used just as a normal socket. |
| */ |
| |
| CURLcode Curl_proxyCONNECT(struct connectdata *conn, |
| int sockindex, |
| const char *hostname, |
| int remote_port) |
| { |
| CURLcode result; |
| if(!conn->connect_state) { |
| result = connect_init(conn, FALSE); |
| if(result) |
| return result; |
| } |
| result = CONNECT(conn, sockindex, hostname, remote_port); |
| |
| if(result || Curl_connect_complete(conn)) |
| connect_done(conn); |
| |
| return result; |
| } |
| |
| #else |
| void Curl_connect_free(struct Curl_easy *data) |
| { |
| (void)data; |
| } |
| |
| #endif /* CURL_DISABLE_PROXY */ |
