[PATCH access-control] fix #7144: auth: ldap: force utf-8 encoding for bind credentials

[PATCH access-control] fix #7144: auth: ldap: force utf-8 encoding for bind credentials

[Elias Huhsovitz]

When saving the LDAP/AD bind password to /etc/pve/priv/realm/<realm>.pw,
the file was written using the default byte encoding. This caused
passwords containing non-ASCII characters (e.g., '£' or '§') to be
truncated to their lowest byte, resulting in authentication failures
during subsequent sync operations.

Pass the 'force_utf8' flag to file_set_contents to ensure the password
is encoded as UTF-8 before being written to disk.

Signed-off-by: Elias Huhsovitz <e.huhsovitz@proxmox.com>
---
 src/PVE/Auth/LDAP.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/PVE/Auth/LDAP.pm b/src/PVE/Auth/LDAP.pm
index 6a73ee8..21ee047 100755
--- a/src/PVE/Auth/LDAP.pm
+++ b/src/PVE/Auth/LDAP.pm
@@ -438,7 +438,7 @@ sub ldap_set_credentials {
     my $cred_file = ldap_cred_file_name($realmid);
     mkdir $ldap_pw_dir;
 
-    PVE::Tools::file_set_contents($cred_file, $password);
+    PVE::Tools::file_set_contents($cred_file, $password, 0600, 1);
 
     return $cred_file;
 }
-- 
2.47.3

Re: [PATCH access-control] fix #7144: auth: ldap: force utf-8 encoding for bind credentials

[Shannon Sterz]

On Thu Jul 9, 2026 at 4:00 PM CEST, Elias Huhsovitz wrote:
> When saving the LDAP/AD bind password to /etc/pve/priv/realm/<realm>.pw,
> the file was written using the default byte encoding. This caused
> passwords containing non-ASCII characters (e.g., '£' or '§') to be
> truncated to their lowest byte, resulting in authentication failures
> during subsequent sync operations.
>
> Pass the 'force_utf8' flag to file_set_contents to ensure the password
> is encoded as UTF-8 before being written to disk.
>
> Signed-off-by: Elias Huhsovitz <e.huhsovitz@proxmox.com>
> ---
>  src/PVE/Auth/LDAP.pm | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/src/PVE/Auth/LDAP.pm b/src/PVE/Auth/LDAP.pm
> index 6a73ee8..21ee047 100755
> --- a/src/PVE/Auth/LDAP.pm
> +++ b/src/PVE/Auth/LDAP.pm
> @@ -438,7 +438,7 @@ sub ldap_set_credentials {
>      my $cred_file = ldap_cred_file_name($realmid);
>      mkdir $ldap_pw_dir;
>
> -    PVE::Tools::file_set_contents($cred_file, $password);
> +    PVE::Tools::file_set_contents($cred_file, $password, 0600, 1);

nit: this also sets the previously unspecified permissions. while this
has no impact in reality because they match the permissions that were
assigned previously already, you should document that in the commit
message. if you don't want to explicitly set the perissions pass `undef`
instead of `0600`.

>
>      return $cred_file;
>  }