CURLOPT_TLSAUTH_USERNAME(3) Library Functions ManualCURLOPT_TLSAUTH_USERNAME(3)
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-termi-
nated username to use for the TLS authentication method specified with
the CURLOPT_TLSAUTH_TYPE(3) option. Requires that the CURLOPT_TL-
SAUTH_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 res;
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");
res = 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 2026-07-12 CURLOPT_TLSAUTH_USERNAME(3)
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