Error x509 - The CRT/CRL/CSR format is invalid

[cristiancl]

Hello there,

I've been unable to connect to my VPN that was working flawlessly before.

I don't know if by updating OpenVPN iOS app something could have stopped working or if i'm doing something wrong after an update.

I tried to regenerate all keys to avoid a mismatch with old keys but the problem persists.

I'm using DD-WRT OpenVPN server (2.4.6 with OpenSSL 1.1.1a) and OpenVPN 2.4.7 to generate the keys. OpenVPN on IOS is on v3.0.2

Whenever i try to connect, i receive this message:

"mbed TLS: error parsing cert certificate: X509 - The CRT/CRL/CSR format is invalid, eg. different type expected"



Server Config:

Code: Select all

TUN
TCP
AES-256 CBC
SHA512
TLS-DHE-RSA-WITH-AES-256-GCM-SHA384
LZO Compression Adaptive

Public Server Cert
    Certificate: 
        Data:
        ...
-----BEGIN CERTIFICATE-----
KEY
-----END CERTIFICATE-----

CA Cert
-----BEGIN CERTIFICATE-----
KEY
-----END CERTIFICATE-----

Private Server Key
-----BEGIN PRIVATE KEY-----
KEY
-----END PRIVATE KEY-----

DH PEM
-----BEGIN DH PARAMETERS-----
KEY
-----END DH PARAMETERS-----

TLS Auth Key
-----BEGIN OpenVPN Static key V1-----
KEY
-----END OpenVPN Static key V1-----




mode server
tls-server
key-direction 0
tls-version-min 1.2
tls-cipher "DEFAULT:@SECLEVEL=0"
verb 5

Client Config:

Code: Select all

#Tells OpenVPN where the remote server is located
remote IP PORT

#Put OpenVPN into client mode
client

#Set the remote server certification type
remote-cert-tls server

#Set the VPN type (TUN vs TAP)
dev tun

#Set the protocol being used
proto tcp

#Make OpenVPN retry infitirely when a connection is dropped
resolv-retry infinite

#Nobind
nobind

#Persist
persist-key
persist-tun

#Required for TUN connections, optional for TAP
float

#Setup TLS use for the tunnel
#Force minimum version use to prevent vulnerabilities in older versions
tls-version-min 1.2

#Set the TLS cipher type
tls-cipher TLS-DHE-RSA-WITH-AES-256-GCM-SHA384

#Set the data encryption cipher type
cipher AES-256-CBC

#Set the authentication hashing cipher type
auth SHA512

#Request the server re-negotiate keys every 5 minutes
reneg-sec 300

#Tell the client that LZO Compression is in use
comp-lzo

#Set the VPN Tunnel as the default gateway for the client machine
redirect-gateway def1

#TLS Configuration
key-direction 1
tls-client

<ca>
-----BEGIN CERTIFICATE-----
KEY
-----END CERTIFICATE-----
</ca>
<cert>
-----BEGIN CERTIFICATE REQUEST-----
KEY
-----END CERTIFICATE REQUEST-----
</cert>
<key>
-----BEGIN PRIVATE KEY-----
KEY
-----END PRIVATE KEY-----
</key>
<tls-auth>
-----BEGIN OpenVPN Static key V1-----
KEY
-----END OpenVPN Static key V1-----
</tls-auth>

App Settings:

Code: Select all

Reconnect On Wakeup: ON
Seamless Tunnel: ON
VPN Protocol: TCP
IPV6: NO PREFERENCE
Connection Timetout: CONTINUOUSLY RETRY
Allow Compression: NO
AES-CBC: Check
Minimum TLS Version 1.2

Any help is appreciated,
Thanks

[TinCanTech]

"mbed TLS: error parsing cert certificate: X509 - The CRT/CRL/CSR format is invalid, eg. different type expected"

This sounds like you have not created the certificate properly/completely .. or maybe there was an error copy/pasting it to your client config file ?

I'm using DD-WRT OpenVPN server (2.4.6 with OpenSSL 1.1.1a) and OpenVPN 2.4.7 to generate the keys.

I recommend you use EasyRSA3:
https://github.com/OpenVPN/easy-rsa/releases

[cristiancl]

"mbed TLS: error parsing cert certificate: X509 - The CRT/CRL/CSR format is invalid, eg. different type expected"

This sounds like you have not created the certificate properly/completely .. or maybe there was an error copy/pasting it to your client config file ?

I'm using DD-WRT OpenVPN server (2.4.6 with OpenSSL 1.1.1a) and OpenVPN 2.4.7 to generate the keys.

I recommend you use EasyRSA3:
https://github.com/OpenVPN/easy-rsa/releases

Well, just tried that and the problem persists.

Server

Code: Select all

Server Cert: 
    Certificate:
        Data:
            Version: 3 (0x2)
        ...
-----BEGIN CERTIFICATE-----
KEY
-----END CERTIFICATE-----

CA:
-----BEGIN RSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: AES-256-CBC,XXXXXXX

KEY
-----END RSA PRIVATE KEY-----


Server Key:
-----BEGIN ENCRYPTED PRIVATE KEY-----
KEY
-----END ENCRYPTED PRIVATE KEY-----

DH:
-----BEGIN DH PARAMETERS-----
KEY
-----END DH PARAMETERS-----

TLS:
-----BEGIN OpenVPN Static key V1-----
KEY
-----END OpenVPN Static key V1-----

Client

Code: Select all

<ca>
-----BEGIN RSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: AES-256-CBC,XXXXX

KEY
-----END RSA PRIVATE KEY-----
</ca>
<cert>
    Certificate:
        Data:
                 Version: 3 (0x2)
         ...
-----BEGIN CERTIFICATE-----
KEY
-----END CERTIFICATE-----
</cert>
<key>
-----BEGIN PRIVATE KEY-----
KEY
-----END PRIVATE KEY-----
</key>
<tls-auth>
-----BEGIN OpenVPN Static key V1-----
KEY
-----END OpenVPN Static key V1-----