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Bug 496114

Summary:	repo entry with double slashes cause wrong Host: header
Product:	Red Hat Enterprise Linux 5	Reporter:	Mike McCune <mmccune>
Component:	yum	Assignee:	Packaging Maintenance Team <packaging-team-maint>
Status:	CLOSED INSUFFICIENT_DATA	QA Contact:	BaseOS QE Security Team <qe-baseos-security>
Severity:	medium	Docs Contact:
Priority:	low
Version:	5.3	CC:	james.antill
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-03-12 20:32:41 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Mike McCune 2009-04-16 17:50:25 UTC

Using a kickstart file with the following repo entry:

repo --name=VT --baseurl=http://somehost.example.com:80//ks/dist/ks-rhel-i386-server-5-u3/VT/repodata/repomd.xml

and a %packages entry with:

%packages
xen

generates a request from anaconda to the server with an incorrect Host header:

GET //ks/dist/ks-rhel-i386-server-5-u3/VT/repodata/repomd.xml HTTP/1.1
Accept-Encoding: identity
Host: ks
Connection: close
User-agent: urlgrabber/3.1.0 yum/3.2.19

note the Host: ks instead of the actual server.  This caused the server that was hosting the repo's data to respond with a 404.

If we correct the kickstart file to not contain the double slashes after the port:

repo --name=VT --baseurl=http://somehost.example.com:80/ks/dist/ks-rhel-i386-server-5-u3/VT/repodata/repomd.xml

it works fine.  We changed our application to ensure that our kickstart files do not contain the // but it took us a while to realize those double slashes were causing breakage.

Comment 1 Chris Lumens 2009-04-29 18:16:39 UTC

We just pass the baseurl down to yum, which probably does some mangling of it before passing it down into python's urllib/urlgrabber/whatever.  It's probably worth doing sanitizing of the URL at some lower level than anaconda to make sure the whole system benefits from it.

Comment 3 James Antill 2009-04-29 21:41:01 UTC

 Also the only thing I know that does anything "funny" with URLs is fastestmirror, and that does:

host = lambda mirror: mirror.split('/')[2].split('@')[-1]

...which works fine. AFAIK everything else in yum/urlgrabber uses 
urlparse.urlparse().
 Can you reproduce this with plain yum?