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CURLOPT_PROXY_ISSUERCERT(3)         libcurl        CURLOPT_PROXY_ISSUERCERT(3)


NAME

       CURLOPT_PROXY_ISSUERCERT - proxy issuer SSL certificate filename


SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_ISSUERCERT, char *file);


DESCRIPTION

       Pass a char * to a null-terminated string naming a file holding a CA
       certificate in PEM format. If the option is set, an additional check
       against the peer certificate is performed to verify the issuer of the
       the HTTPS proxy is indeed the one associated with the certificate
       provided by the option.  This additional check is useful in multi-level
       PKI where one needs to enforce that the peer certificate is from a
       specific branch of the tree.

       This option makes sense only when used in combination with the
       CURLOPT_PROXY_SSL_VERIFYPEER(3) option. Otherwise, the result of the
       check is not considered as failure.

       A specific error code (CURLE_SSL_ISSUER_ERROR) is defined with the
       option, which is returned if the setup of the SSL/TLS session has
       failed due to a mismatch with the issuer of peer certificate
       (CURLOPT_PROXY_SSL_VERIFYPEER(3) has to be set too for the check to
       fail).

       The application does not have to keep the string around after setting
       this option.


DEFAULT

       NULL


PROTOCOLS

       All TLS-based protocols


EXAMPLE

       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
         /* using an HTTPS proxy */
         curl_easy_setopt(curl, CURLOPT_PROXY, "https://localhost:443");
         curl_easy_setopt(curl, CURLOPT_PROXY_ISSUERCERT, "/etc/certs/cacert.pem");
         ret = curl_easy_perform(curl);
         curl_easy_cleanup(curl);
       }


AVAILABILITY

       Added in 7.71.0. This option is supported by the OpenSSL backends.


RETURN VALUE

       Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if
       not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.


SEE ALSO

       CURLOPT_PROXY_SSL_VERIFYPEER(3), CURLOPT_PROXY_SSL_VERIFYHOST(3),
       CURLOPT_SSL_VERIFYPEER(3), CURLOPT_SSL_VERIFYHOST(3),

ibcurl 8.1.2                    April 26, 2023     CURLOPT_PROXY_ISSUERCERT(3)

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