CURLOPT\_KRBLEVEL(3) Library Functions Manual CURLOPT\_KRBLEVEL(3)

# [NAME](#NAME)

CURLOPT\_KRBLEVEL - FTP kerberos security level

# [SYNOPSIS](#SYNOPSIS)

```
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_KRBLEVEL, char *level);
```

# [DESCRIPTION](#DESCRIPTION)

Deprecated. It serves no purpose anymore.

Pass a char pointer as parameter. Set the kerberos security level for FTP; this also enables kerberos awareness. This is a string that should match one of the following: *clear*, *safe*, *confidential* or *private*. If the string is set but does not match one of these, *private* is used. Set the string to NULL to disable kerberos support for FTP.

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

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

# [DEFAULT](#DEFAULT)

NULL

# [PROTOCOLS](#PROTOCOLS)

This functionality affects ftp only

# [EXAMPLE](#EXAMPLE)

```
int main(void)
{


  CURL *curl = curl_easy_init();


  if(curl) {


    CURLcode result;


    curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/foo.bin");


    curl_easy_setopt(curl, CURLOPT_KRBLEVEL, "private");


    result = curl_easy_perform(curl);


    curl_easy_cleanup(curl);


  }
}
```

# [HISTORY](#HISTORY)

Functionality removed in 8.17.0

This option was known as CURLOPT\_KRB4LEVEL up to 7.16.3

# [DEPRECATED](#DEPRECATED)

Deprecated since 8.17.0

# [AVAILABILITY](#AVAILABILITY)

Added in curl 7.16.4

# [RETURN VALUE](#RETURN_VALUE)

[*curl\_easy\_setopt(3)*](/man/os/curl/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)*](/man/os/curl/libcurl-errors.3).

# [SEE ALSO](#SEE_ALSO)

[**CURLOPT\_USE\_SSL**(3)](/man/os/curl/CURLOPT_USE_SSL.3)

2026-10-19 libcurl

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Document: CURLOPT_KRBLEVEL(3) from curl 8.23.0-r1 (Chainguard OS)
Source: https://github.com/curl/curl.git