1283521 – Users with OTP authentication fail to authenticate

RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Bug 1283521 - Users with OTP authentication fail to authenticate

Summary: Users with OTP authentication fail to authenticate

Keywords:
Status:	CLOSED ERRATA
Alias:	None
Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	mod_authnz_pam
Sub Component:
Version:	7.2
Hardware:	Unspecified
OS:	Unspecified
Priority:	high
Severity:	high
Target Milestone:	rc
Target Release:	---
Assignee:	Jan Pazdziora (Red Hat)
QA Contact:	Namita Soman
Docs Contact:
URL:
Whiteboard:
Depends On:	1279591
Blocks:
TreeView+	depends on / blocked

Reported:	2015-11-19 08:26 UTC by Jan Kurik
Modified:	2015-12-08 10:24 UTC (History)
CC List:	6 users (show)
Fixed In Version:	mod_authnz_pam-0.9.3-5.el7_2
Doc Type:	Bug Fix
Doc Text:	Previously, Web applications did not correctly handle two-factor authentication, a traditional password and a One-Time Password (OTP), when they used the mod_intercept_form_submit Apache module, and also the Pluggable Authentication Module (PAM) supported pre-auth, for example the pam_sss.so module. As a consequence, the authentication failed. With this update, mod_authnz_pam only provides the concatenated password and the OTP input to the first password PAM response. As a result, authentication no longer fails in the described situation.
Clone Of:	1279591
Environment:
Last Closed:	2015-12-08 10:24:05 UTC
Target Upstream Version:
Embargoed:

Attachments	(Terms of Use)

Links
System	ID	Private	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHBA-2015:2563	0	normal	SHIPPED_LIVE	mod_authnz_pam bug fix update	2015-12-08 15:23:17 UTC

Description Jan Kurik 2015-11-19 08:26:21 UTC

This bug has been copied from bug #1279591 and has been proposed
to be backported to 7.2 z-stream (EUS).

Comment 4 Jan Pazdziora (Red Hat) 2015-11-23 17:04:34 UTC

Used upstream change 6de21466287c3e77850ab1d66f076405971ba4f3 in mod_authnz_pam-0.9.3-5.el7_2.

Comment 6 Scott Poore 2015-11-25 22:04:12 UTC

Verified.

Version ::

mod_authnz_pam-0.9.3-5.el7_2.x86_64

Results ::

Using steps from bug #1279591

###################################
# 1. First setup webapp cgi script

[root@rhel7-3 www]# URLBASE="https://fedorapeople.org/cgit/adelton/public_git/CGI-sessions.git"
[root@rhel7-3 www]# curl -o app.cgi -s "$URLBASE/plain/app.cgi?id=start"

[root@rhel7-3 www]# curl -s "$URLBASE/patch/app.cgi?id=trust-REMOTE_USER" | patch -p1 app.cgi
patching file app.cgi

[root@rhel7-3 www]# curl -s "$URLBASE/patch/app.cgi?id=login2" | patch -p1 app.cgi
patching file app.cgi

[root@rhel7-3 www]# chmod a+x /var/www/app.cgi

[root@rhel7-3 www]# semanage fcontext -a -t httpd_sys_script_exec_t '/var/www/app\.cgi'

[root@rhel7-3 www]# restorecon -rvv /var/www/app.cgi
restorecon reset /var/www/app.cgi context unconfined_u:object_r:httpd_sys_content_t:s0->unconfined_u:object_r:httpd_sys_script_exec_t:s0

[root@rhel7-3 www]# setsebool -P allow_httpd_mod_auth_pam 1

###################################
# 2.  Setup Apache config pointing to webapp cgi script

[root@rhel7-3 www]# cd /etc/httpd/conf.d

[root@rhel7-3 conf.d]# cat > app.conf <<EOF
> ScriptAlias /application /var/www/app.cgi
> LoadModule auth_kerb_module modules/mod_auth_kerb.so
> LoadModule authnz_pam_module modules/mod_authnz_pam.so
> LoadModule intercept_form_submit_module modules/mod_intercept_form_submit.so
> 
> <Location /application/login>
>   AuthType Kerberos
>   AuthName "Kerberos Login"
>   KrbMethodNegotiate On
>   KrbMethodK5Passwd Off
>   KrbAuthRealms EXAMPLE.COM
>   Krb5KeyTab /etc/http.keytab
>   require pam-account wikiapp
>   ErrorDocument 401 '<html><meta http-equiv="refresh" content="0; URL=/application/login2"><body>Kerberos authentication did not pass.</body></html>'
> </Location>
> 
> <Location /application/login2>
>   InterceptFormPAMService wikiapp
>   InterceptFormLogin login
>   InterceptFormPassword password
> </Location>
> EOF

[root@rhel7-3 conf.d]# kinit admin
Password for admin: 

[root@rhel7-3 conf.d]# ipa-getkeytab -s rhel7-1.example.com -k /etc/http.keytab -p HTTP/$(hostname)
Keytab successfully retrieved and stored in: /etc/http.keytab


###################################
# 3.  Setup pam for webapp

[root@rhel7-3 conf.d]# cat > /etc/pam.d/wikiapp <<EOF
> auth    required   pam_sss.so
> account required   pam_sss.so
> EOF


###################################
# 4. Add user

[root@rhel7-3 conf.d]# ipa user-add testuser --first=f --last=l --password
Password: 
Enter Password again to verify: 
---------------------
Added user "testuser"
---------------------
  User login: testuser
  First name: f
  Last name: l
  Full name: f l
  Display name: f l
  Initials: fl
  Home directory: /home/testuser
  GECOS: f l
  Login shell: /bin/sh
  Kerberos principal: testuser
  Email address: testuser
  UID: 373800009
  GID: 373800009
  Password: True
  Member of groups: ipausers
  Kerberos keys available: True
[root@rhel7-3 conf.d]# kinit testuser
Password for testuser: 
Password expired.  You must change it now.
Enter new password: 
Enter it again: 

###################################
# 5.  add OTP soft token for user

[root@rhel7-3 conf.d]# kdestroy -A
[root@rhel7-3 conf.d]# kinit testuser
Password for testuser: 
[root@rhel7-3 conf.d]# ipa otptoken-add --type=totp --desc="My token"
------------------
Added OTP token ""
------------------
  Unique ID: b90edc4f-1bdb-4e3a-9bb5-ba8757d2700e
  Type: TOTP
  Description: My token
  Owner: testuser
  Manager: testuser
  Algorithm: sha1
  Digits: 6
  Clock interval: 30
  URI: otpauth://totp/testuser:b90edc4f-1bdb-4e3a-9bb5-ba8757d2700e?digits=6&secret=DK654DEPRREDDXUW444DJSMSAVUKOHWA&period=30&algorithm=SHA1&issuer=testuser%40EXAMPLE.COM

<QR Code removed>

###################################
# 6. Now on android, use FreeOTP to scan QR code

###################################
# 7. Set User to use OTP Auth

[root@rhel7-3 conf.d]# kdestroy -A

[root@rhel7-3 conf.d]# kinit admin
Password for admin: 

[root@rhel7-3 conf.d]# ipa user-mod testuser --user-auth-type=otp
------------------------
Modified user "testuser"
------------------------
  User login: testuser
  First name: f
  Last name: l
  Home directory: /home/testuser
  Login shell: /bin/sh
  Email address: testuser
  UID: 373800009
  GID: 373800009
  User authentication types: otp
  Account disabled: False
  Password: True
  Member of groups: ipausers
  Kerberos keys available: True

###################################
# 8. Restart httpd

[root@rhel7-3 conf.d]# systemctl restart httpd


###################################
# 9. Test access.  
# Use FreeOTP to generate the OTP code to add to end of password in curl command.

[root@rhel7-3 conf.d]# curl -d login=testuser -d password=Secret123555116 -si http://$(hostname)/application/login2 | grep "Logged in as"
    <title>Logged in as testuser</title>
    <h1>Logged in as testuser</h1>

Comment 8 errata-xmlrpc 2015-12-08 10:24:05 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2563.html

Note You need to log in before you can comment on or make changes to this bug.