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s3/auth: implement "winbind:ignore domains"

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Under the following conditions a user from an ignored domain might be able to
authenticate:

- using Kerberos

- successfully previous authentication so the idmap and name caches are filled

- winbind not running (fwiw, winbindd is mandatory on a domain member)

- nscd running with a cached getpwnam for the ignored user (otherwise auth fails
  because getpwnam fails)

- lookup_name() function being modified to look into the name cache before
  contacting winbindd. Currently it talks directly to winbindd and that will
  check the cache.

Currently, authentication will only fail because creating the local token for
the user fails because an LSA lookupname RPC call fails (because winbindd is not
running).

All of this makes a successfull authentication unlikelly, but that is more by
accident then by design.

To ensures that if winbindd is not running and as such winbindd itself can not
enforce the restriction, also implement the ignored domains check in the auth
system as a last line of defense.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14602
RN: "winbind:ignore domains" doesn't prevent user login from trusted domain

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This commit is contained in:
Ralph Boehme 2021-01-15 12:56:25 +01:00 committed by Jeremy Allison
parent da474ddd13
commit df5fe2d835
1 changed files with 8 additions and 0 deletions
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8
source3/auth/auth_util.c
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@ -485,6 +485,14 @@ NTSTATUS create_local_token(TALLOC_CTX *mem_ctx,
return NT_STATUS_LOGON_FAILURE;
}
if (!is_allowed_domain(server_info->info3->base.logon_domain.string)) {
DBG_NOTICE("Authentication failed for user [%s] "
"from firewalled domain [%s]\n",
server_info->info3->base.account_name.string,
server_info->info3->base.logon_domain.string);
return NT_STATUS_AUTHENTICATION_FIREWALL_FAILED;
}
if (server_info->cached_session_info != NULL) {
session_info = copy_session_info(mem_ctx,
server_info->cached_session_info);