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Bug 1434991 - Issue processing ssh keys from certificates in ssh respoder
Summary: Issue processing ssh keys from certificates in ssh respoder
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: sssd
Version: 7.3
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: SSSD Maintainers
QA Contact: Scott Poore
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-03-22 20:45 UTC by Jakub Hrozek
Modified: 2020-05-02 18:38 UTC (History)
11 users (show)

Fixed In Version: sssd-1.15.2-5.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2017-08-01 09:04:18 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Github SSSD sssd issues 4363 0 None None None 2020-05-02 18:38:02 UTC
Red Hat Product Errata RHEA-2017:2294 0 normal SHIPPED_LIVE sssd bug fix and enhancement update 2017-08-01 12:39:55 UTC

Description Jakub Hrozek 2017-03-22 20:45:09 UTC 
This bug is created as a clone of upstream ticket:
https://pagure.io/SSSD/sssd/issue/3332

The keys returned by get_valid_certs_keys() are already binary and not base64 encoded.

decode_and_add_base64_data() is called later with the third argument unconditionally set to 'false' which indicates that base64_decode should be called on the data which fails with the data returned by get_valid_certs_keys(). 

So either get_valid_certs_keys()  should return base64 encoded data which would be a bit redundant because base64_decode is called a few cycles later. Or ssh_get_output_keys() should return base64 encoded and binary key in two different variable and decode_and_add_base64_data() is called for each of them with the right setting of the third argument.
Comment 3 Jakub Hrozek 2017-03-29 13:04:33 UTC 
* master:
 * 1b5d6b1afc9c3dc696b7b45f2d73b2634f42800a
 * bd1fa0ec90be717c3b7796d74b6f243f40178d16
Comment 5 Sumit Bose 2017-03-29 14:16:54 UTC 
How to reproduce:
- add a certificate to an IPA user
- call sss_ssh_authorizedkeys for the IPA user

Expected result:
- sss_ssh_authorizedkeys returns a public ssh-key derived from the public key of the certificate

Result without the fix:
- sss_ssh_authorizedkeys return nothing
Comment 8 Scott Poore 2017-05-08 15:11:37 UTC 
Verified.

Version ::
sssd-1.15.2-17.el7.x86_64

Results ::

[root@dhcp129-184 ssh]# sss_ssh_authorizedkeys demosc1
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCtyajUGYAiy77oF+P9v28KY0FygpIJyeELEz+ODM0qekS7kbOZ164ZdcWyegyvySXvDJmNWpONNfcMJov8umEgGl0cUnvoJ+U2/QJFCrzNb9Dz2lQfQnJngPLi2phNiN/d0EXnEfjNFwaLbI+dh5q5oaHPIrnhEQw2lrVP+8zlqhCwXY8pUtejudjilQszBNImVnVhRHX3EaPIb7bFSoE6tsD/9DjUM8tI68my9QwJOhTJBx+XaJ9h3a5XSVzN/6v8aXqpXTBBFQfveXWWmRwQS+tO/5ZryoXhac3QMbRJKxO648o+YT7GRF0LDW3uzQKJeaG726b/188qODLdLbFB

This is covered also in the smart card tests for ssh.

[root@dhcp129-184 ~]# p11tool --provider /usr/lib64/opensc-pkcs11.so --list-all-certs
Object 0:
	URL: pkcs11:model=PKCS%2315;manufacturer=OpenSC%20Project;serial=0C0A548021220224;token=demosc1%20%28OpenSC%20Card%29;id=%01;object=Certificate;type=cert
	Type: X.509 Certificate
	Label: Certificate
	ID: 01

[root@dhcp129-184 ~]# p11tool --provider /usr/lib64/opensc-pkcs11.so --outfile /tmp/demosc1_on_card.crt1 --export 'pkcs11:model=PKCS%2315;manufacturer=OpenSC%20Project;serial=0C0A548021220224;token=demosc1%20%28OpenSC%20Card%29;id=%01;object=Certificate;type=cert'


[root@dhcp129-184 ~]# ipa user-show demosc1 --out=/tmp/demosc1.crt1
-------------------------------------------------
Certificate(s) stored in file '/tmp/demosc1.crt1'
-------------------------------------------------
  User login: demosc1
  First name: demosc
  Last name: demosc1
  Home directory: /home/demosc1
  Login shell: /bin/sh
  Principal name: demosc1
  Principal alias: demosc1
  Email address: demosc1
  UID: 576400131
  GID: 576400131
  Certificate: MIIE...
  Certificate mapping data: X509:<I>O=TESTRELM.TEST,CN=Certificate
                            Authority<S>O=TESTRELM.TEST,CN=demosc1
  Account disabled: False
  Password: True
  Member of groups: ipausers
  Kerberos keys available: True


[root@dhcp129-184 ~]# vim /tmp/demosc1.crt1 
# just removed ^M's 

[root@dhcp129-184 ~]# diff /tmp/demosc1.crt1 /tmp/demosc1_on_card.crt1
24a25,26
> 
> 

So certs are the same.

[root@dhcp129-184 ~]# ssh -I /usr/lib64/opensc-pkcs11.so -l demosc1 $(hostname) whoami
Enter PIN for 'demosc1 (OpenSC Card)': 
demosc1
Comment 9 errata-xmlrpc 2017-08-01 09:04:18 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://access.redhat.com/errata/RHEA-2017:2294
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