CURLOPT_PROXY_SSL_VERIFYPEER - verify the proxy's SSL certificate
#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_VERIFYPEER, long verify);
curl_easy_setopt options CURLOPT_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) option. 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 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 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. ATTRIBUTES See attributes(7) for descriptions of the following attributes: +---------------+------------------+ |ATTRIBUTE TYPE | ATTRIBUTE VALUE | +---------------+------------------+ |Availability | web/curl | +---------------+------------------+ |Stability | Uncommitted | +---------------+------------------+ SEE ALSO CURLOPT_PROXY_SSL_VERIFYHOST(3), CURLOPT_SSL_VERIFYPEER(3), CUR- LOPT_SSL_VERIFYHOST(3), NOTES Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source- code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from https://curl.se/down- load/curl-7.83.1.tar.bz2. Further information about this software can be found on the open source community website at http://curl.haxx.se/. libcurl 7.83.1 November 26, 2021 CURLOPT_PROXY_SSL_VERIFYPEER(3)