[pve-devel] [PATCH common/access-control 0/5] improve LDAP DN and bind creds checking on creation/change

[Friedrich Weber]

Tested against slapd 2.4.47+dfsg-3+deb10u6. I quite like the connection
check when creating/updating the realm, and also, it seems sensible to
delegate DN validation to Net::LDAP.

I noticed one bug: Weirdly, updating the realm via CLI or manually via
API now errors out for me (the connection details are correct):

$ cat /etc/pve/domains.cfg
pam: pam
	comment Linux PAM standard authentication

pve: pve
	comment Proxmox VE authentication server
	default 0

ldap: ldap
	comment foo
	base_dn dc=example,dc=com
	server1 [...]
	user_attr uid
	bind_dn cn=admin,dc=example,dc=com
	default 0
	secure 0

$ pveum realm modify ldap -comment foo
update auth server failed: Expected 'PeerHost' at
/usr/share/perl5/Net/LDAP.pm line 173.

$ http --verify no PUT
'https://[...]:8006/api2/json/access/domains/ldap' comment=foo [...]
HTTP/1.1 500 update auth server failed: Expected 'PeerHost' at
/usr/share/perl5/Net/LDAP.pm line 173.

On 19/07/2023 17:51, Christoph Heiss wrote:
> tl;dr implements the result of the discussion in [0].
> 
> First, this removes the dreaded LDAP DN regex, replacing it instead with
> a proper schema format, which does validation using
> Net::LDAP::Util::canonical_dn().
> 
> Further, upon saving a LDAP realm in the UI, it tries to connect & bind
> using the provided credentials, providing the user with immediate
> feedback whether they are valid or not.
> 
> The same approach is already implemented in PBS [1].
> 
> Changes was done against slapd 2.5.13+dfsg-5.
> 
> [0] https://lists.proxmox.com/pipermail/pve-devel/2023-May/056839.html
> [1] https://git.proxmox.com/?p=proxmox-backup.git;a=commitdiff;h=5210f3b5
> [1] https://lists.proxmox.com/pipermail/pbs-devel/2023-June/006237.html
> 
> pve-common:
> 
> Christoph Heiss (3):
>   schema: add `ldap-dn` format for validating LDAP distinguished names
>   test: add test cases for new 'ldap-dn' schema format
>   ldap: handle errors explicitly everywhere instead of simply `die`ing
> 
>  debian/control              |  2 ++
>  src/PVE/JSONSchema.pm       | 12 +++++++++
>  src/PVE/LDAP.pm             | 11 ++++----
>  test/Makefile               |  9 +++++++
>  test/ldap_dn_format_test.pl | 54 +++++++++++++++++++++++++++++++++++++
>  5 files changed, 83 insertions(+), 5 deletions(-)
> 
> pve-access-control:
> 
> Christoph Heiss (2):
>   ldap: validate LDAP DNs using the `ldap-dn` schema format
>   ldap: check bind credentials with LDAP directory directly on change
> 
>  src/PVE/Auth/LDAP.pm | 28 ++++++++++++++++------------
>  1 file changed, 16 insertions(+), 12 deletions(-)
> 
> --
> 2.41.0
> 
> 
> 
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