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| .TH CURLOPT_PROXY_ISSUERCERT 3 "November 04, 2020" "libcurl 7.78.0" "curl_easy_setopt options" |
| |
| .SH NAME |
| CURLOPT_PROXY_ISSUERCERT \- proxy issuer SSL certificate filename |
| .SH SYNOPSIS |
| #include <curl/curl.h> |
| |
| CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_ISSUERCERT, char *file); |
| .SH DESCRIPTION |
| Pass a char * to a null-terminated string naming a \fIfile\fP 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 |
| \fICURLOPT_PROXY_SSL_VERIFYPEER(3)\fP 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 |
| (\fICURLOPT_PROXY_SSL_VERIFYPEER(3)\fP has to be set too for the check to |
| fail). |
| |
| The application does not have to keep the string around after setting this |
| option. |
| .SH DEFAULT |
| NULL |
| .SH PROTOCOLS |
| All TLS-based protocols |
| .SH EXAMPLE |
| .nf |
| 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); |
| } |
| .fi |
| .SH AVAILABILITY |
| Added in libcurl 7.71.0. This option is supported by the OpenSSL backends. |
| .SH 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. |
| .SH "SEE ALSO" |
| .BR CURLOPT_PROXY_SSL_VERIFYPEER "(3), " CURLOPT_PROXY_SSL_VERIFYHOST "(3), " |
| .BR CURLOPT_SSL_VERIFYPEER "(3), " CURLOPT_SSL_VERIFYHOST "(3), " |
