---
name: "pure-certd"
section: "8"
platform: "linux"
package: "pure-ftpd-common"
version: "1.0.50-2.2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/pure-certd"
---

# pure-certd(8)

TLS certificate agent for Pure-FTPd.

## NAME

pure-certd - TLS certificate agent for Pure-FTPd.

## SYNTAX

pure-certd \[*-p* \<*/path/to/pidfile*\>\] \[*-u* uid\] \[*-g* gid\] \[*-B*\] \<*-s* /path/to/socket\> *-r* /program/to/run

## DESCRIPTION

pure-certd is a daemon that forks an authentication program, waits for a certificate path as a reply, and returns it to an application server.

pure-certd listens to a local Unix socket. A new connection to that socket should send pure-authd the following structure:

-

  sni\_name:xxx end

These content is passed to the authentication program, as an environment variable:

-

  CERTD\_SNI\_NAME

The authentication program should take appropriate actions to select a TLS certificate, and reply to the standard output with the following format:

-

  action:strict cert\_file:/path/to/cert.pem key\_file:/path/to/cert.pem end

- **cert\_file:**xxx

  Absolute path to the certificate in PEM format.

- **key\_file:**xxx

  This is optional, as a certificate and its key can be concatenated in the same file.

- **action:**xxx

  If action is "deny", a certificate for that name was not found and access is denied. If xxx is "default", the default certificate will be used. If xxx is "strict", the certificate whose path is indicated in "cert\_path" will be used. If absent or invalid, access will be denied. If xxx is "fallback", the certificate whose path is indicated in "cert\_path" will be used. If absent or invalid, the default certificate will be used instead.

- **uid:**xxx

  The system uid to be assigned to that user. Must be \> 0.

- **gid:**xxx

  The primary system gid. Must be \> 0.

- **dir:**xxx

  The absolute path to the home directory. Can contain /./ for a chroot jail.

*Only one authentication program is forked at a time. It must return quickly.*

## OPTIONS

- **-u** \<*uid*\>

  Have the daemon run with that uid.

- **-g** \<*gid*\>

  Have the daemon run with that gid.

- **-B**

  Fork in background (daemonization).

- **-s** \<*/path/to/socket*\>

  Set the full path to the local Unix socket.

- **-r** \<*/path/to/program*\>

  Set the full path to the authentication program.

- **-h**

  Output help information and exit.

## EXAMPLES

To run this program the standard way type:

pure-certd -s /var/run/certd.sock -r /usr/bin/my-cert-program &

pure-ftpd -lextcert:/var/run/certd.sock &

- /usr/bin/my-cert-program can be as simple as:

  \#! /bin/sh

  echo 'action:strict'

  echo 'cert\_file:/etc/ssl/private/pure-ftpd/cert.pem'

  echo 'end'

## AUTHORS

Frank DENIS \<j at pureftpd dot org\>

## SEE ALSO

**[ftp(1)](/ftp/1.md)**, **[pure-ftpd(8)](/pure-ftpd/8.md)** **[pure-ftpwho(8)](/pure-ftpwho/8.md)** **[pure-mrtginfo(8)](/pure-mrtginfo/8.md)** **[pure-uploadscript(8)](/pure-uploadscript/8.md)** **[pure-statsdecode(8)](/pure-statsdecode/8.md)** **[pure-pw(8)](/pure-pw/8.md)** **[pure-quotacheck(8)](/pure-quotacheck/8.md)** **[pure-authd(8)](/pure-authd/8.md)**