CURLOPT_PROXY_SSL_VERIFYPEEcurl_easy_setopt optCURLOPT_PROXY_SSL_VERIFYPEER(3)
NAME
CURLOPT_PROXY_SSL_VERIFYPEER - verify the proxy's SSL certificate
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_VERIFYPEER,
long verify);
DESCRIPTION
Pass a long as parameter set to 1L to enable or 0L to disable.
This option tells curl to verifies the authenticity of the HTTPS
proxy's certificate. A value of 1 means curl verifies; 0 (zero) means
it does not.
This is the proxy version of CURLOPT_SSL_VERIFYPEER(3) that is used for
ordinary HTTPS servers.
When negotiating a TLS or SSL connection, the server sends a certifi-
cate indicating its identity. Curl verifies whether the certificate is
authentic, i.e. that you can trust that the server is who the certifi-
cate says it is. This trust is based on a chain of digital signatures,
rooted in certification authority (CA) certificates you supply. curl
uses a default bundle of CA certificates (the path for that is deter-
mined at build time) and you can specify alternate certificates with
the CURLOPT_PROXY_CAINFO(3) option or the CURLOPT_PROXY_CAPATH(3) op-
tion.
When CURLOPT_PROXY_SSL_VERIFYPEER(3) is enabled, and the verification
fails to prove that the certificate is authentic, the connection fails.
When the option is zero, the peer certificate verification succeeds re-
gardless.
Authenticating the certificate is not enough to be sure about the
server. You typically also want to ensure that the server is the server
you mean to be talking to. Use CURLOPT_PROXY_SSL_VERIFYHOST(3) for
that. The check that the host name in the certificate is valid for the
host name you are connecting to is done independently of the CUR-
LOPT_PROXY_SSL_VERIFYPEER(3) option.
WARNING: disabling verification of the certificate allows bad guys to
man-in-the-middle the communication without you knowing it. Disabling
verification makes the communication insecure. Just having encryption
on a transfer is not enough as you cannot be sure that you are communi-
cating with the correct end-point.
DEFAULT
1
PROTOCOLS
All
EXAMPLE
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
/* Set the default value: strict certificate check please */
curl_easy_setopt(curl, CURLOPT_PROXY_SSL_VERIFYPEER, 1L);
curl_easy_perform(curl);
}
AVAILABILITY
Added in 7.52.0
If built TLS enabled.
RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
if not.
SEE ALSO
CURLOPT_PROXY_SSL_VERIFYHOST(3), CURLOPT_SSL_VERIFYPEER(3), CUR-
LOPT_SSL_VERIFYHOST(3),
libcurl 7.81.0 November 26, 202CURLOPT_PROXY_SSL_VERIFYPEER(3)
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