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From Bill Tangren <>
Subject [users@httpd] apache client authentication problem (somewhat long)
Date Tue, 28 Nov 2006 19:38:22 GMT
I posted this on the Redhat Enterprise Linux 4 (Nahant) list, but I didn't get 
sufficient help to solve my problem, so I'm trying here. I apologize in advance 
if any of you have seen this before.

I am having a problem with client authentication with apache and openssl. I have 
been ordered to get this working, or I will have to be shut down. I think this 
is a complex problem (because my web site is somewhat complex, at least for me) 
but I will try to simplify it as much as possible.

I am trying to set up a test directory that requires client authentication, 
while the parent directory (which is used for web email) does not. I also have 
non-encrypted web sites, and that may be what is bollixing up this process, I 
don't know.

When I use Internet Explorer to access this test directory, I am successfully 
presented with the certificate, and required to provide my client certificate. 
After I do so, however, I get a

"The page cannot be displayed. The page is currently unavailable..."

Nothing shows up in /var/log/httpd/ssl_error_log, or in 
/var/log/httpd/ssl_access_log. However, /var/log/httpd/webmail_error_log shows this:

[Wed Nov 22 11:00:56 2006] [error] Certificate Verification: Error (20): unable 
to get local issuer certificate
[Wed Nov 22 11:00:56 2006] [error] Re-negotiation handshake failed: Not accepted 
by client!?

/var/log/httpd/webmail_access_log indicates an apache 103 error: - - [22/Nov/2006:11:00:55 -0500] "GET /pkitest/ 
HTTP/1.0" 103 - "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; 
.NET CLR 1.1.4322; .NET CLR 1.0.3705; .NET CLR 2.0.50727)"

I've never heard of a 103 error. The apache error codes seem to start in the 
200's (

Googling comes up with this:


which indicated a number of things, which I tried without success.

Googling on the renegotiation handshake error yielded quite a bit on use of 
KeepAlive, but I don't use it, and turning it on didn't help.

There are other, simpler, web sites here at work that only have this client 
authentication, and they were able to implement it without trouble. They are, 
however, on a fedora core 5 system running apache 2.2.x.

I run httpd-2.0.52-28 and openssl-0.9.7a-43.14 on a RHEL ES 4 system. My 
*httpd.conf* contains (in part)

    ErrorLog /var/log/httpd/webmail_error_log
    CustomLog /var/log/httpd/webmail_access_log combined
    TransferLog /var/log/httpd/access_log
    SSLEngine on
    SSLCertificateFile    /etc/httpd/conf/ssl.crt/AA_PKI.crt
    SSLCertificateKeyFile /etc/httpd/conf/ssl.key/AA_PKI.key
    SSLCACertificateFile  /etc/httpd/conf/ssl.crt/root.crt
    SSLVerifyClient none

    <Files ~ "\.(cgi|shtml)$">
       SSLOptions +StdEnvVars

    ScriptAlias /cgi-bin/ "/var/www/cgi-bin/"
    <Directory "/var/www/cgi-bin">
       SSLOptions +StdEnvVars
       AllowOverride None
       Options None
       Order allow,deny
       Allow from all

    <Directory "/var/www/html/pkitest">
       Options Indexes FollowSymLinks MultiViews Includes
       AllowOverride None
       Order allow,deny
       Allow from all
       SSLVerifyClient require
       SSLVerifyDepth 10

    SetEnvIf User-Agent ".*MSIE.*" nokeepalive ssl-unclean-shutdown \
       downgrade-1.0 force-response-1.0
    CustomLog /etc/httpd/logs/ssl_request_log "%t %h %{SSL_PROTOCOL}x \
       %{SSL_CIPHER}x \"%r\" %b"

    DocumentRoot /var/www/html
    <Directory "/var/www">
       Options -Indexes FollowSymLinks MultiViews Includes
       AllowOverride None
       Order allow,deny
       Allow from all
    Alias /webmail /usr/share/squirrelmail

My *ssl.conf* contains

LoadModule ssl_module modules/
Listen 443
AddType application/x-x509-ca-cert .crt
AddType application/x-pkcs7-crl    .crl
SSLPassPhraseDialog  builtin
SSLSessionCache         shmcb:/var/cache/mod_ssl/scache(512000)
SSLSessionCacheTimeout  300
SSLMutex default
SSLRandomSeed startup file:/dev/urandom  256
SSLRandomSeed connect builtin
SSLCryptoDevice builtin

<VirtualHost _default_:443>

RewriteEngine on
RewriteRule ^https://aa/$
ErrorLog logs/ssl_error_log
TransferLog logs/ssl_access_log
LogLevel warn
SSLEngine on
SSLProtocol all -SSLv2
SSLCertificateFile /etc/httpd/conf/ssl.crt/AA_PKI.crt
SSLCertificateKeyFile /etc/httpd/conf/ssl.key/AA_PKI.key
SSLCACertificateFile /etc/httpd/conf/ssl.crt/root.crt
SSLCACertificatePath /etc/httpd/conf/ssl.crt
SSLVerifyClient optional
SSLVerifyDepth  10
<Files ~ "\.(cgi|shtml|phtml|php3?)$">
     SSLOptions +StdEnvVars
<Directory "/var/www/cgi-bin">
     SSLOptions +StdEnvVars
SetEnvIf User-Agent ".*MSIE.*" \
          nokeepalive ssl-unclean-shutdown \
          downgrade-1.0 force-response-1.0
CustomLog logs/ssl_request_log \
           "%t %h %{SSL_PROTOCOL}x %{SSL_CIPHER}x \"%r\" %b"


Can anyone help?


Bill Tangren

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