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| .TH CURLOPT_PROXY_SSL_VERIFYPEER 3 "November 04, 2020" "libcurl 7.78.0" "curl_easy_setopt options" |
| |
| .SH NAME |
| CURLOPT_PROXY_SSL_VERIFYPEER \- verify the proxy's SSL certificate |
| .SH SYNOPSIS |
| #include <curl/curl.h> |
| |
| CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_VERIFYPEER, long verify); |
| .SH 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 doesn't. |
| |
| This is the proxy version of \fICURLOPT_SSL_VERIFYPEER(3)\fP that's used for |
| ordinary HTTPS servers. |
| |
| When negotiating a TLS or SSL connection, the server sends a certificate |
| indicating its identity. Curl verifies whether the certificate is authentic, |
| i.e. that you can trust that the server is who the certificate 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 determined at build time) and you can |
| specify alternate certificates with the \fICURLOPT_PROXY_CAINFO(3)\fP option |
| or the \fICURLOPT_PROXY_CAPATH(3)\fP option. |
| |
| When \fICURLOPT_PROXY_SSL_VERIFYPEER(3)\fP 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 regardless. |
| |
| 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 \fICURLOPT_PROXY_SSL_VERIFYHOST(3)\fP for that. The check |
| that the host name in the certificate is valid for the host name you're |
| connecting to is done independently of the |
| \fICURLOPT_PROXY_SSL_VERIFYPEER(3)\fP 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 communicating with |
| the correct end-point. |
| .SH DEFAULT |
| 1 |
| .SH PROTOCOLS |
| All |
| .SH EXAMPLE |
| .nf |
| 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); |
| } |
| .fi |
| .SH AVAILABILITY |
| Added in 7.52.0 |
| |
| If built TLS enabled. |
| .SH RETURN VALUE |
| Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. |
| .SH "SEE ALSO" |
| .BR CURLOPT_PROXY_SSL_VERIFYHOST "(3), " |
| .BR CURLOPT_SSL_VERIFYPEER "(3), " |
| .BR CURLOPT_SSL_VERIFYHOST "(3), " |
