CURLOPT_TLSAUTH_USERNAME(3) Introduction to Library Functions

NAME

CURLOPT_TLSAUTH_USERNAME - username to use for TLS authentication

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TLSAUTH_USERNAME, char *user);

DESCRIPTION

Pass a char pointer as parameter, which should point to the
null-terminated username to use for the TLS authentication method
specified with the CURLOPT_TLSAUTH_TYPE(3) option. Requires that the
CURLOPT_TLSAUTH_PASSWORD(3) option also be set.

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.

This feature relies on TLS SRP which does not work with TLS 1.3.

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 and
OpenSSL

EXAMPLE

int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode result;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
curl_easy_setopt(curl, CURLOPT_TLSAUTH_TYPE, "SRP");
curl_easy_setopt(curl, CURLOPT_TLSAUTH_USERNAME, "user");
curl_easy_setopt(curl, CURLOPT_TLSAUTH_PASSWORD, "secret");
result = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}

AVAILABILITY

Added in curl 7.21.4

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).

SEE ALSO

CURLOPT_TLSAUTH_PASSWORD(3), CURLOPT_TLSAUTH_TYPE(3)

libcurl 2026-01-08 CURLOPT_TLSAUTH_USERNAME(3)