Tribblix: manual page: CURLOPT

CURLOPT_SSLCERT(3) Introduction to Library Functions CURLOPT_SSLCERT(3)

NAME

CURLOPT_SSLCERT - SSL client certificate

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLCERT, char *cert);

DESCRIPTION

Pass a pointer to a null-terminated string as parameter. The string
should be the filename of your client certificate. The default format
is P12 on Secure Transport and PEM on other engines, and can be
changed with CURLOPT_SSLCERTTYPE(3).

With Secure Transport, this can also be the nickname of the
certificate you wish to authenticate with as it is named in the
security database. If you want to use a file from the current
directory, please precede it with ./ prefix, in order to avoid
confusion with a nickname.

(Schannel only) Client certificates can be specified by a path
expression to a certificate store. (You can import PFX to a store
first). You can use "<store location>\<store name>\<thumbprint>" to
refer to a certificate in the system certificates store, for example,
"CurrentUser\MY\934a7ac6f8a5d5". The thumbprint is usually a SHA-1
hex string which you can see in certificate details. Following store
locations are supported: CurrentUser, LocalMachine, CurrentService,
Services, CurrentUserGroupPolicy, LocalMachineGroupPolicy,
LocalMachineEnterprise. Schannel also support P12 certificate file,
with the string P12 specified with CURLOPT_SSLCERTTYPE(3).

When using a client certificate, you most likely also need to provide
a private key with CURLOPT_SSLKEY(3).

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

Using this option multiple times makes the last set string override
the previous ones. Set it to NULL to disable its use again.

DEFAULT

NULL

PROTOCOLS

This functionality affects all TLS based protocols: HTTPS, FTPS,
IMAPS, POP3S, SMTPS etc.

This option works only with the following TLS backends: GnuTLS,
OpenSSL, Schannel, Secure Transport, mbedTLS and wolfSSL

EXAMPLE

int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
curl_easy_setopt(curl, CURLOPT_SSLCERT, "client.pem");
curl_easy_setopt(curl, CURLOPT_SSLKEY, "key.pem");
curl_easy_setopt(curl, CURLOPT_KEYPASSWD, "s3cret");
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}

AVAILABILITY

Added in curl 7.1

RETURN VALUE

curl_easy_setopt(3) returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non-zero means an error
occurred, see libcurl-errors(3).