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Is it possible, to force apache to ask for password only if user don't have client-certificate installed?

I'm almost sure, that this is possible, but I'm not able to find any confirmation anywhere.

Is it possible to configure apache to act like this:

If user will have client-certificate - apache will allow connection to webpage without any problem or question. If user-certificate on the client-side will not be available, it will ask for basic auth authentication - so it will ask for password?

How to configure it? I'm fighting this since morning without any solution even to just stick to it.

6
  • You did read the manual and especially the SSLOptions +FakeBasicAuth section? – HBruijn Feb 24 '14 at 12:43
  • Sure I did ;) But not sure I really understand it. Here is something i 've tried: [link]httpd.apache.org/docs/trunk/ssl/ssl_howto.html#certauthenticate But it's not working as i want. 1. It asks for certificate. If no certificate - no access is granted. If I give certificate - access is granted and Basic Auth is triggered asking for login and password. But it's not accepting password i created in file with htpasswd, instead it tries to validate user created from certificate data. I've tried to create such user manuall, but it's not working either. So I'm stuck ;) – Lisek Feb 24 '14 at 15:24
  • once Again - what i need is: if certificate provided - access granted. if certificate absent - ask for password, and if validated - grant access. Right now, it asks for password after certificate validation. Tried with SSLRequire optional – Lisek Feb 24 '14 at 15:28
  • OK. So It works like this right now. If no certificate - it's ok. Ask for password, and if typed correctly allows to access site. If certificate will be provided auth should not appear - but it appears. In error.log i've got password mismatch for user: /C=Something/ST=Something/L=Something/O=Something/OU=Something/CN=backup-something.com - and CN is my server's name also. I think apache config is ok - but i need to prepare passfile with htpasswd some special way, or create certificate with some special way. But how? ;) – Lisek Feb 24 '14 at 15:39
  • OK. SOLVED! :P What was needed was to change password in passfile to: xxj31ZMTZzkVA witch is "password" (read from apache man) - works great! – Lisek Feb 24 '14 at 15:49
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Here is a script to get the entries for the password file from the certificates: (see also https://serverfault.com/posts/747107)

In the .fakehttpsauth you need to put entries like:

/C=US/ST=CA/O=Doe Inc/CN=John Doe/emailAddress=john@doe.com:xxj31ZMTZzkVA

Here is a script to create such entries from your certificates:

#!/bin/bash
# export the certificates in fake auth format
# see https://serverfault.com/questions/533639/apache-authentication-with-ssl-certificate-and-sslusername
# WF 2016-01-06
fakepass=`openssl passwd -crypt -salt xx password`
for c in *.crt 
do
  openssl x509 -in $c -text  | grep Subject: | gawk -v fakepass=$fakepass '
BEGIN { FS="," }
{ 
  gsub("Subject: ","",$0)
  for (i=1;i<=NF;i++) {
    f=trim($i)
    printf("/%s",f);
  }
  printf(":%s\n",fakepass);
}

# see https://gist.github.com/andrewrcollins/1592991
function ltrim(s) { sub(/^[ \t\r\n]+/, "", s); return s }
function rtrim(s) { sub(/[ \t\r\n]+$/, "", s); return s }
function trim(s)  { return rtrim(ltrim(s)); }
'
done

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