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The global locking can lead to deadlocks when using nscd: when processing the
first request in winbind, when we know we call into code that will recurse into
winbind we call winbind_off() which sets an environment variable which is later
checked here in the nsswitch module.
But with nscd in the stack, we don't see the env variable in nsswitch, so when
we try to acquire the global lock again, it is already locked and we deadlock.
By using a thread specific winbindd_context, plus a few other thread local global
variables, we don't need a global lock anymore.
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Memory allocated for response is never freed.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15164
Signed-off-by: Andrew Walker <awalker@ixsystems.com>
Reviewed-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Christof Schmitt <cs@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Tue Sep 6 20:10:17 UTC 2022 on sn-devel-184
Use the same function append_unix_username() uses to build the expected
value as it depends on the server role. This requires linking
winbindd-lib.
Signed-off-by: Samuel Cabrero <scabrero@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Over the last month I got more and more reports,
that it's not possible to use a custom Samba version
on systems with sssd being installed, which depends on some
specific samba libraries installed in the system.
One major problem is that the custom libnss_winbind.so.2
depends on the libreplace-samba4.so of the custom build
and also injects an RPATH into the running process.
When sssd uses any nss library call it will get this,
when it then tries to load some of its plugins via dlopen(),
e.g.
ldd /usr/lib64/sssd/libsss_ad.so| grep samba
libsamba-util.so.0 => /lib64/libsamba-util.so.0
libreplace-samba4.so => /usr/lib64/samba/libreplace-samba4.so
libsamba-security-samba4.so => /usr/lib64/samba/libsamba-security-samba4.so
libsamba-errors.so.1 => /lib64/libsamba-errors.so.1
libsamba-debug-samba4.so => /usr/lib64/samba/libsamba-debug-samba4.so
libgenrand-samba4.so => /usr/lib64/samba/libgenrand-samba4.so
libsocket-blocking-samba4.so => /usr/lib64/samba/libsocket-blocking-samba4.so
libtime-basic-samba4.so => /usr/lib64/samba/libtime-basic-samba4.so
libsys-rw-samba4.so => /usr/lib64/samba/libsys-rw-samba4.so
libiov-buf-samba4.so => /usr/lib64/samba/libiov-buf-samba4.so
When that loads dlopen() will fail as a soname libreplace-samba4.so is
already loaded, but the symbol version within the other one don't match, as the
contain the exact version, e.g. replace_dummy@@SAMBA_4.13.3.
This is just an example and similar things can happen in all situations
where we provide libraries, which are potentially injected into every
process of the running system. These should only depend on libc.so and
related basic system libraries in order to avoid the problem.
We have the following libraries, which are in the that category:
- libnss_winbind.so.2
- libnss_wins.so.2
- pam_winbind.so
- winbind_krb5_locator.so
- async_dns_krb5_locator.so
The rules of library loading are really complex and symbol versioning
is not enough to solve it, only the combination of unique soname and
unique symbol version suffix seem to solve the problem, but injecting
an RPATH is still a problem.
In order to solve the problem I experimented with adding SAMBA_SUBSYSTEM()
definitions with 'hide_symbols=True' in order to do some static linking
of selected components, e.g.
bld.SAMBA_SUBSYSTEM('replace-hidden',
source=REPLACE_SOURCE,
group='base_libraries',
hide_symbols=True,
deps='dl attr' + extra_libs)
It's relatively simple to get to the point where the following are
completely static:
- libnss_winbind.so.2
- libnss_wins.so.2
- pam_winbind.so
- winbind_krb5_locator.so
But 'async_dns_krb5_locator.so' links in almost everything!
It seems we install the krb5 plugins into our own $MODULESDIR/krb5/,
so it may not be so critical, as long it's the admin who created
the desired symlinks into the location the kerberos libraries search
for plugins. Note the at least the locator plugins are always loaded
without any configuration, every .so in a special path are loaded with dlopen().
This is done by every application using kerberos, so we load a lot of samba libraries
into them.
Packagers should not put async_dns_krb5_locator.so (nor a symlink) into
the path that's reachable by libkrb5.so.
As a longterm solution we may want to change async_dns_krb5_locator.so
to use a helper process with posix_spawn() instead of doing everything
within the process.
Note I added hiden_symbols=True to the nss modules for Linux and
FreeBSD only, because these are the only platforms I'm able to test
on. We most likely should do the same on other platforms, but some
with access to the platform should provide a tested patch.
In order to avoid manual definitions of SAMBA_SUBSYSTEMS() with
'-hidden', I added the 'provide_builtin_linking=True' option,
as the logic is very similar to what we already have with the
'--builtin-libraries=BUILTIN_LIBRARIES' configure option.
SAMBA_PLUGIN() is used in order to use SAMBA_LIBRARY() in order
to make it more strict that these plugins can't be used as
normal depedency by other subsystems and libraries.
While being there it was easy enough to make libwbclient.so
also standalone without dependecies to other samba libraries.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14780
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Some private functions from wbclient_internal.h already
leaked into the ABI. With hide_symbols=True we make sure
this doesn't happen again.
Having wbcRequestResponse[Priv]() as part of the ABI helps us
in order to hide winbindd_[priv_]request_response() soon.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14780
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
../../nsswitch/libwbclient/wbc_sid.c:83:5: error: assuming signed overflow does not occur when simplifying conditional [-Werror=strict-overflow]
if (len+1 > sizeof(buf)) {
^
Even this would fail:
../../nsswitch/libwbclient/wbc_sid.c:83:5: error: assuming signed overflow does not occur when simplifying conditional [-Werror=strict-overflow]
if (len >= sizeof(buf)) {
^
Note that this only seems to happen with gcc 7 and when -O3 and
-fvisibility=hidden are used together. E.g. in the opensuse151-samba-o3
builds.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14780
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
The "x" sscanf conversion specifier requires an unsigned int. It is
likely that this is actually a uint32_t, don't rely on that.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Samuel Cabrero <scabrero@samba.org>
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Swen Schillig <swen@linux.ibm.com>
Reviewed-by: Volker Lendecke <vl@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Mon Aug 3 22:21:04 UTC 2020 on sn-devel-184
Fixes:
nsswitch/libwbclient/wbc_util.c:123:3: warning: Value stored to 'wbc_status' is never read <--[clang]
wbc_status = WBC_ERR_SUCCESS;
^ ~~~~~~~~~~~~~~~
1 warning generated.
Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
Fixes:
nsswitch/libwbclient/wbc_sid.c:848:2: warning: Potential leak of memory pointed to by 'extra_data'
free(extra_data);
^
1 warning generated.
Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
In order to detect an value overflow error during
the string to integer conversion with strtoul/strtoull,
the errno variable must be set to zero before the execution and
checked after the conversion is performed. This is achieved by
using the wrapper function strtoul_err and strtoull_err.
Signed-off-by: Swen Schillig <swen@linux.ibm.com>
Reviewed-by: Ralph Böhme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
With an AD DC, wbcListGroups returns the users in the DOMAIN SEPARATOR
GROUPNAME format. The test then calls wbcLookupName with the domain
name and the previous string (including domain and separator) as
username. Fix this by passing the correct username and adding some
additional checks.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13312
Signed-off-by: Christof Schmitt <cs@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
With an AD DC, wbcListUsers returns the users in the DOMAIN SEPARATOR
USERNAME format. The test then calls wbcLookupName with the domain name
and the previous string (including domain and separator) as username.
Fix this by passing the correct username and adding some additional
checks.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13312
Signed-off-by: Christof Schmitt <cs@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Remove wrong "Local" strcmp(), there's another one, the correct one, a few lines
below. Since commit 95e3307917
WBC_DOMINFO_TRUSTTYPE_NONE, which corresponded to the string "None" in the
winbindd response, is not used anymore.
Bug: https://bugzilla.samba.org/show_bug.cgi?id=13313
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Fri Mar 2 05:49:18 CET 2018 on sn-devel-144
Add one use of popt_set_cmdline_credentials().
Fix 80 column limits when cmdline_credentials changes
to popt_get_cmdline_credentials().
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Thu Mar 23 12:55:26 CET 2017 on sn-devel-144
We don't need to change the protocol version because:
1. An old client may provide the "initial_blob"
(which was and is still ignored when going
via the wbcCredentialCache() function)
and the new winbindd won't use new_spnego.
2. A new client will just get a zero byte
from an old winbindd. As it uses talloc_zero() to
create struct winbindd_response.
3. Changing the version number would introduce problems
with backports to older Samba versions.
New clients which are capable of using the new_spnego field
will use "negotiate_blob" instead of "initial_blob".
BUG: https://bugzilla.samba.org/show_bug.cgi?id=11644
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Günther Deschner <gd@samba.org>
An implementation of https://lists.samba.org/archive/samba/2012-March/166497.html (which has been discussed in 2012, but was never implemented).
It has been tested on a Debian Jessie system with this patch added to the Debian package (which is currently 4.1.17). Even though this is Samba 4, the ntlm_auth installed is the one from Samba 3 (yes, it surprised me too). The backend was a machine with Windows 2012R2.
It was first tested with the local security policy 'Network Security: LAN Manager authentication level' setting changed to 'Send NTLMv2 Response Only' (allow ntlm v1). This way we are able to authenticate with and without the MSV1_0_ALLOW_MSVCHAPV2 flag (as expected).
After the basic step has been verified, the local security policy 'Network Security: LAN Manager authentication level' setting was changed to 'Send NTLMv2 Response Only. Refuse LM & NTLM' (only allow ntlm v2). The behaviour now changed according to the MSV1_0_ALLOW_MSVCHAPV2 flag (again: as expected).
$ ntlm_auth --request-nt-key --username=XXXXXXXXXXXXX --challenge=XXXXXXXXXXXXXXXXX --nt-response=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX --domain=
Logon failure (0xc000006d)
$ ntlm_auth --request-nt-key --username=XXXXXXXXXXXXX --challenge=XXXXXXXXXXXXXXXXX --nt-response=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX --domain= --allow-mschapv2
NT_KEY: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
The changes in `wbclient.h` are intended for programs that use libwinbind directly instead of authenticating via `ntlm_auth`. I intend to use that within FreeRADIUS (see https://bugzilla.samba.org/show_bug.cgi?id=11149).
BUG: https://bugzilla.samba.org/show_bug.cgi?id=11694
Signed-off-by: Herwin Weststrate <herwin@quarantainenet.nl>
Reviewed-by: Kai Blin <kai@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
