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This looks like a regression introduced by the recent security fixes. This
commit should hopefully fixes it.
As a quick solution it might be possible to use the username map script based on
the example in https://bugzilla.samba.org/show_bug.cgi?id=14901#c0. We're not
sure this behaves identical, but it might work in the standalone server case.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14922
Reported-at: https://lists.samba.org/archive/samba/2021-November/238720.html
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Ralph Boehme <slow@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
(cherry picked from commit 1e61de8306604a0d3858342df8a1d2412d8d418b)
Before the CVE-2020-25717 fixes we had a fallback from
getpwnam('DOMAIN\user') to getpwnam('user') which was very dangerous and
unpredictable.
Now we do the fallback based on sid_to_uid() followed by
getpwuid() on the returned uid.
This obsoletes 'username map [script]' based workaround adviced
for CVE-2020-25717, when nss_winbindd is not used or
idmap_nss is actually used.
In future we may decide to prefer or only do the SID/UID based
lookup, but for now we want to keep this unchanged as much as possible.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14901
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
[metze@samba.org moved the new logic into the fallback codepath only
in order to avoid behavior changes as much as possible]
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Mon Nov 15 19:01:56 UTC 2021 on sn-devel-184
(cherry picked from commit 0a546be05295a7e4a552f9f4f0c74aeb2e9a0d6e)
Autobuild-User(v4-14-test): Jule Anger <janger@samba.org>
Autobuild-Date(v4-14-test): Thu Nov 18 07:39:38 UTC 2021 on sn-devel-184
This is only ever be called in standalone mode with an MIT realm,
so we don't have a PAC/info3 structure.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14556
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This code is only every called in standalone mode on a MIT realm,
it means we never have a PAC and we also don't have winbindd arround.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14556
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
We should be strict in standalone mode, that we only support MIT realms
without a PAC in order to keep the code sane.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14556
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This consolidates the code paths used for NTLMSSP and Kerberos!
I checked what we were already doing for NTLMSSP, which is this:
a) source3/auth/auth_winbind.c calls wbcAuthenticateUserEx()
b) as a domain member we require a valid response from winbindd,
otherwise we'll return NT_STATUS_NO_LOGON_SERVERS
c) we call make_server_info_wbcAuthUserInfo(), which internally
calls make_server_info_info3()
d) auth_check_ntlm_password() calls
smb_pam_accountcheck(unix_username, rhost), where rhost
is only an ipv4 or ipv6 address (without reverse dns lookup)
e) from auth3_check_password_send/auth3_check_password_recv()
server_returned_info will be passed to auth3_generate_session_info(),
triggered by gensec_session_info(), which means we'll call into
create_local_token() in order to transform auth_serversupplied_info
into auth_session_info.
For Kerberos gensec_session_info() will call
auth3_generate_session_info_pac() via the gensec_generate_session_info_pac()
helper function. The current logic is this:
a) gensec_generate_session_info_pac() is the function that
evaluates the 'gensec:require_pac', which defaulted to 'no'
before.
b) auth3_generate_session_info_pac() called
wbcAuthenticateUserEx() in order to pass the PAC blob
to winbindd, but only to prime its cache, e.g. netsamlogon cache
and others. Most failures were just ignored.
c) If the PAC blob is available, it extracted the PAC_LOGON_INFO
from it.
d) Then we called the horrible get_user_from_kerberos_info() function:
- It uses a first part of the tickets principal name (before the @)
as username and combines that with the 'logon_info->base.logon_domain'
if the logon_info (PAC) is present.
- As a fallback without a PAC it's tries to ask winbindd for a mapping
from realm to netbios domain name.
- Finally is falls back to using the realm as netbios domain name
With this information is builds 'userdomain+winbind_separator+useraccount'
and calls map_username() followed by smb_getpwnam() with create=true,
Note this is similar to the make_server_info_info3() => check_account()
=> smb_getpwnam() logic under 3.
- It also calls smb_pam_accountcheck(), but may pass the reverse DNS lookup name
instead of the ip address as rhost.
- It does some MAP_TO_GUEST_ON_BAD_UID logic and auto creates the
guest account.
e) We called create_info3_from_pac_logon_info()
f) make_session_info_krb5() calls gets called and triggers this:
- If get_user_from_kerberos_info() mapped to guest, it calls
make_server_info_guest()
- If create_info3_from_pac_logon_info() created a info3 from logon_info,
it calls make_server_info_info3()
- Without a PAC it tries pdb_getsampwnam()/make_server_info_sam() with
a fallback to make_server_info_pw()
From there it calls create_local_token()
I tried to change auth3_generate_session_info_pac() to behave similar
to auth_winbind.c together with auth3_generate_session_info() as
a domain member, as we now rely on a PAC:
a) As domain member we require a PAC and always call wbcAuthenticateUserEx()
and require a valid response!
b) we call make_server_info_wbcAuthUserInfo(), which internally
calls make_server_info_info3(). Note make_server_info_info3()
handles MAP_TO_GUEST_ON_BAD_UID and make_server_info_guest()
internally.
c) Similar to auth_check_ntlm_password() we now call
smb_pam_accountcheck(unix_username, rhost), where rhost
is only an ipv4 or ipv6 address (without reverse dns lookup)
d) From there it calls create_local_token()
As standalone server (in an MIT realm) we continue
with the already existing code logic, which works without a PAC:
a) we keep smb_getpwnam() with create=true logic as it
also requires an explicit 'add user script' option.
b) In the following commits we assert that there's
actually no PAC in this mode, which means we can
remove unused and confusing code.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14646
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14556
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
As we want to reduce use of 'classic domain controller' role but FreeIPA
relies on it internally, add a separate role to mark FreeIPA domain
controller role.
It means that role won't result in ROLE_STANDALONE.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14801
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14556
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Alexander Bokovoy <ab@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
We always require a running winbindd on a domain member, so
we should better fail a request instead of silently alter
the behaviour, which results in a different unix token, just
because winbindd might be restarted.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14801
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14556
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
So far we tried getpwnam("DOMAIN\account") first and
always did a fallback to getpwnam("account") completely
ignoring the domain part, this just causes problems
as we mix "DOMAIN1\account", "DOMAIN2\account",
and "account"!
As we require a running winbindd for domain member setups
we should no longer do a fallback to just "account" for
users served by winbindd!
For users of the local SAM don't use this code path,
as check_sam_security() doesn't call check_account().
The only case where smb_getpwnam("account") happens is
when map_username() via ("username map [script]") mapped
"DOMAIN\account" to something without '\', but that is
explicitly desired by the admin.
Note: use 'git show -w'
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14801
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14556
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Ralph Boehme <slow@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
So far we autocreated local user accounts based on just the
account_name (just ignoring any domain part).
This only happens via a possible 'add user script',
which is not typically defined on domain members
and on NT4 DCs local users already exist in the
local passdb anyway.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14556
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14801
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This is not strictly needed, but makes it easier to audit
that we don't miss important places.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14556
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
First set up "server_info" in a local variable and once it's fully set
up, assign it to the out parameter "pserver_info".
Pointer dereferencing obfuscates the code for me.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14556
(cherry picked from commit 062a0c14c6ee0b74e7619af73747df59c5e67672)
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>
(cherry picked from commit df5fe2d835169161d3930acf1e9c750dd2bc64b6)
It's a bit shocking how many references we have to global
contexts. Make this a bit more obvious.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Rather than have safe_string.h #include string_wrappers.h, make users of
string_wrappers.h include it explicitly.
includes.h now no longer includes string_wrappers.h transitively. Still
allow includes.h to #include safe_string.h for now so that as many
modules as possible get the safety checks in it.
Signed-off-by: Matthew DeVore <matvore@google.com>
Reviewed-by: David Mulder <dmulder@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This is needed for make_session_info_from_username() to fill in the domain
name. The callchain goes like this:
make_session_info_from_username()
-> make_server_info_pw()
-> passwd_to_SamInfo3()
Other callers of passwd_to_SamInfo3() are also affected. A subsequent change
will let set_conn_force_user_group() user the domainname from the session_info
returned from make_session_info_from_username() to create substitution
context. Without this fix domain name would be NULL.
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This delays reloading config slightly, but I don't see how could affect
observable behaviour other then log messages coming from the functions in
between the different locations for lp_load_with_shares() like
make_user_info_map() are sent to a different logfile if "log file" uses %U.
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
This delays reloading config slightly, but I don't see how could affect
observable behaviour other then log messages coming from the functions in
between the different locations for lp_load_with_shares() like
make_session_info_krb5() are sent to a different logfile if "log file" uses %U.
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
When a domain member gets an empty domain name or '.', it should
not forward the authentication to domain controllers of
the primary domain.
But we need to keep passing UPN account names with
an empty domain to the DCs as a domain member.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14247
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
There's no real logic change here, but is makes it easier to
understand.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14247
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
The fake async code has been pushed down into the 3 users, remove the sync
callback. Overall it's more lines of code, but the central interface is
simplified.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Mon Jan 6 23:34:00 UTC 2020 on sn-devel-184
This is just fake async, but it avoids one use of a sync function
pointer in auth4_context
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Use generate_random_buffer() directly on the talloc'ed buffer
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
Did this ever really work?
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Mon Dec 2 22:47:24 UTC 2019 on sn-devel-184
Fixes:
source3/auth/auth.c:38:35: warning: Value stored to 'entry' during its initialization is never read <--[clang]
struct auth_init_function_entry *entry = auth_backends;
^~~~~ ~~~~~~~~~~~~~
1 warning generated.
Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Jeremy Allison <jra@samba.org>
Fixes:
source3/auth/auth_util.c:283:11: warning: Value stored to 'ret' during its initialization is never read <--[clang]
NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
^~~ ~~~~~~~~~~~~~~~~~~~~~~
source3/auth/auth_util.c:2005:11: warning: Value stored to 'nt_status' during its initialization is never read <--[clang]
NTSTATUS nt_status = NT_STATUS_OK;
^~~~~~~~~ ~~~~~~~~~~~~
2 warnings generated.
Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Jeremy Allison <jra@samba.org>
