Script to upload certificate to FRITZ!Box

This scripts allows to upload a certificate and a private key to a FRITZ!Box via curl. It can be used after a new certificate was obtained via Let's Encrypt for example.

The idea was taken from https://gist.github.com/wikrie/f1d5747a714e0a34d0582981f7cb4cfb

Usage

You have to provide a baseurl for your FRITZ!Box, a username, a password, a certpath to contain fullchain.pem and privkey.pem, or a fullchain and privkey file directly. This can be done using environment variables or command line options. Command line options have a higher precedence.

Parameter	Environment	Command line option
baseurl	FRITZBOX_BASEURL	-b
username	FRITZBOX_USERNAME	-u
password	FRITZBOX_PASSWORD	-p
certpath	FRITZBOX_CERTPATH	-c
fullchain	FRITZBOX_FULLCHAIN	-c
privkey	FRITZBOX_PRIVKEY	-k
debug	FRITZBOX_DEBUG	-d

For debugging set the environment variable FRITZBOX_DEBUG to any non-empty string or use the command line option -d. The HTTP requests and responses will be written to a temporary file /tmp/fritzbox_debug.XXXXXX then.

Limitations

Only RSA keys are supported by FRITZ!OS.

Examples

Using command line options:

./fritzbox_upload_certificate.sh \
  -b http://fritz.box \
  -u admin \
  -p secret \
  -c ./certificates/fritz.box

or

./fritzbox_upload_certificate.sh \
  -b http://fritz.box \
  -u admin \
  -p secret \
  -f ./.lego/certificates/fritz.box.crt \
  -k ./.lego/certificates/fritz.box.key

Using environment variables:

export FRITZBOX_BASEURL=http://fritz.box
export FRITZBOX_USERNAME=admin
export FRITZBOX_PASSWORD=secret
export FRITZBOX_CERTPATH=./certificates/fritz.box
./fritzbox_upload_certificate.sh

or

export FRITZBOX_BASEURL=http://fritz.box
export FRITZBOX_USERNAME=admin
export FRITZBOX_PASSWORD=secret
export FRITZBOX_FULLCHAIN=./.lego/certificates/fritz.box.crt
export FRITZBOX_PRIVKEY=./.lego/certificates/fritz.box.key
./fritzbox_upload_certificate.sh

Tested with

Device	FRITZ!OS	works?
FRITZ!Box 5530 Fiber	7.81	✅
FRITZ!Box 5590 Fiber	8.02	✅
FRITZ!Box 6490 Cable	7.20	✅
FRITZ!Box 6660 Cable	7.57	✅
FRITZ!Box 7360	6.86	✅
FRITZ!Box 7490	7.12	✅
FRITZ!Box 7490	7.57	✅
FRITZ!Box 7530 AX	7.57	✅
FRITZ!Box 7580	7.30	✅
FRITZ!Box 7590	7.29	✅
FRITZ!Repeater 1200 AX	7.57	❌
FRITZ!WLAN Repeater DVB-C	7.01	✅

Let me know what your results are.