CURLOPT_PROXY_SSL_VERIFYHOST - Online Linux Manual PageSection : 3
Updated : November 26, 2021
Source : libcurl 7.82.0
Note : curl_easy_setopt options
NAMECURLOPT_PROXY_SSL_VERIFYHOST − verify the proxy certificate's name against host
SYNOPSIS#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_VERIFYHOST,
long verify);
DESCRIPTIONPass a long set to 2L as asking curl to verify in the HTTPS proxy's certificate name fields against the proxy name. This option determines whether libcurl verifies that the proxy cert contains the correct name for the name it is known as. When CURLOPT_PROXY_SSL_VERIFYHOST(3) is 2, the proxy certificate must indicate that the server is the proxy to which you meant to connect to, or the connection fails. Curl considers the proxy the intended one when the Common Name field or a Subject Alternate Name field in the certificate matches the host name in the proxy string which you told curl to use. If verify value is set to 1: In 7.28.0 and earlier: treated as a debug option of some sorts, not supported anymore due to frequently leading to programmer mistakes. From 7.28.1 to 7.65.3: setting it to 1 made curl_easy_setopt() return an error and leaving the flag untouched. From 7.66.0: treats 1 and 2 the same. When the verify value is 0L, the connection succeeds regardless of the names used in the certificate. Use that ability with caution! See also CURLOPT_PROXY_SSL_VERIFYPEER(3) to verify the digital signature of the proxy certificate. If libcurl is built against NSS and CURLOPT_PROXY_SSL_VERIFYPEER(3) is zero, CURLOPT_PROXY_SSL_VERIFYHOST(3) is also set to zero and cannot be overridden.
DEFAULT2
PROTOCOLSAll protocols when used over an HTTPS proxy.
EXAMPLECURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
/* Set the default value: strict name check please */
curl_easy_setopt(curl, CURLOPT_PROXY_SSL_VERIFYHOST, 2L);
curl_easy_perform(curl);
}
AVAILABILITYAdded in 7.52.0. If built TLS enabled.
RETURN VALUEReturns CURLE_OK if TLS is supported, and CURLE_UNKNOWN_OPTION if not. If 1 is set as argument, CURLE_BAD_FUNCTION_ARGUMENT is returned.
SEE ALSOCURLOPT_PROXY_SSL_VERIFYPEER(3), CURLOPT_PROXY_CAINFO (3)," CURLOPT_SSL_VERIFYPEER(3), CURLOPT_CAINFO (3)," 0
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