CURLOPT_ISSUERCERT(3) curl_easy_setopt options CURLOPT_ISSUERCERT(3)
NAME
CURLOPT_ISSUERCERT - issuer SSL certificate filename
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_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 is in-
deed 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 CUR-
LOPT_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 op-
tion, which is returned if the setup of the SSL/TLS session has failed
due to a mismatch with the issuer of peer certificate (CURLOPT_SSL_VER-
IFYPEER(3) has to be set too for the check to fail). (Added in 7.19.0)
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/");
curl_easy_setopt(curl, CURLOPT_ISSUERCERT, "/etc/certs/cacert.pem");
ret = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
AVAILABILITY
If built TLS enabled
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_CRLFILE(3), CURLOPT_SSL_VERIFYPEER(3),
libcurl 7.81.0 November 26, 2021 CURLOPT_ISSUERCERT(3)
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