---
name: "qop"
section: "5"
platform: "linux"
package: "heimdal-docs"
version: "7.8.git20221117.28daf24+dfsg-9+deb13u1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/qop"
---

# qop(5)

GSS-API Mechanism and QOP files

## NAME

**mech**, **qop** – GSS-API Mechanism and QOP files

## SYNOPSIS

*/etc/gss/mech* */etc/gss/qop*

## DESCRIPTION

The */etc/gss/mech* file contains a list of installed GSS-API security mechanisms. Each line of the file either contains a comment if the first character is '#' or it contains five fields with the following meanings:

- Name

  The name of this GSS-API mechanism.

- Object identifier

  The OID for this mechanism.

- Library

  A shared library containing the implementation of this mechanism.

- Kernel module (optional)

  A kernel module containing the implementation of this mechanism (not yet supported in FreeBSD).

- Library options (optional)

  Optionsal parameters interpreted by the mechanism. Library options must be enclosed in brackets (\[ \]) to differentiate them from the optional kernel module entry.

The */etc/gss/qop* file contains a list of Quality of Protection values for use with GSS-API. Each line of the file either contains a comment if the first character is '#' or it contains three fields with the following meanings:

- QOP string

  The name of this Quality of Protection algorithm.

- QOP value

  The numeric value used to select this algorithm for use with GSS-API functions such as [gss\_get\_mic(3)](/gss_get_mic/3.md).

- Mechanism name

  The GSS-API mechanism name that corresponds to this algorithm.

## EXAMPLES

This is a typical entry from */etc/gss/mech*:

```
kerberosv5	1.2.840.113554.1.2.2	/usr/lib/libgssapi_krb5.so.8	-
```

This is a typical entry from */etc/gss/qop*:

```
GSS_KRB5_CONF_C_QOP_DES		0x0100	kerberosv5
```

## HISTORY

The **mech** manual page example first appeared in FreeBSD 7.0.

## AUTHORS

This manual page was written by Doug Rabson ⟨*dfr@FreeBSD.org*⟩.