1--- 2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3SPDX-License-Identifier: curl 4Title: CURLOPT_PROXY_SSL_VERIFYHOST 5Section: 3 6Source: libcurl 7See-also: 8 - CURLOPT_CAINFO (3) 9 - CURLOPT_PROXY_CAINFO (3) 10 - CURLOPT_PROXY_SSL_VERIFYPEER (3) 11 - CURLOPT_SSL_VERIFYPEER (3) 12Protocol: 13 - TLS 14TLS-backend: 15 - All 16--- 17 18# NAME 19 20CURLOPT_PROXY_SSL_VERIFYHOST - verify the proxy certificate's name against host 21 22# SYNOPSIS 23 24~~~c 25#include <curl/curl.h> 26 27CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_VERIFYHOST, 28 long verify); 29~~~ 30 31# DESCRIPTION 32 33Pass a long set to 2L as asking curl to *verify* in the HTTPS proxy's 34certificate name fields against the proxy name. 35 36This option determines whether libcurl verifies that the proxy cert contains 37the correct name for the name it is known as. 38 39When CURLOPT_PROXY_SSL_VERIFYHOST(3) is 2, the proxy certificate must 40indicate that the server is the proxy to which you meant to connect to, or the 41connection fails. 42 43Curl considers the proxy the intended one when the Common Name field or a 44Subject Alternate Name field in the certificate matches the hostname in the 45proxy string which you told curl to use. 46 47If *verify* value is set to 1: 48 49In 7.28.0 and earlier: treated as a debug option of some sorts, not supported 50anymore due to frequently leading to programmer mistakes. 51 52From 7.28.1 to 7.65.3: setting it to 1 made curl_easy_setopt(3) return 53an error and leaving the flag untouched. 54 55From 7.66.0: treats 1 and 2 the same. 56 57When the *verify* value is 0L, the connection succeeds regardless of the 58names used in the certificate. Use that ability with caution! 59 60See also CURLOPT_PROXY_SSL_VERIFYPEER(3) to verify the digital signature 61of the proxy certificate. 62 63# DEFAULT 64 652 66 67# EXAMPLE 68 69~~~c 70int main(void) 71{ 72 CURL *curl = curl_easy_init(); 73 if(curl) { 74 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); 75 76 /* Set the default value: strict name check please */ 77 curl_easy_setopt(curl, CURLOPT_PROXY_SSL_VERIFYHOST, 2L); 78 79 curl_easy_perform(curl); 80 } 81} 82~~~ 83 84# AVAILABILITY 85 86Added in 7.52.0. 87 88If built TLS enabled. 89 90# RETURN VALUE 91 92Returns CURLE_OK if TLS is supported, and CURLE_UNKNOWN_OPTION if not. 93 94If 1 is set as argument, *CURLE_BAD_FUNCTION_ARGUMENT* is returned. 95