This patch improves the error checking in the LOCAL_PEERCRED version
of virNetSocketGetUNIXIdentity, used by FreeBSD and Mac OSX.

1. The error return paths now correctly unlock the socket. This is
implemented in exactly the same way as the SO_PEERCRED version,
using "goto cleanup"

2. cr.cr_ngroups is initialised to -1, and cr.cr_ngroups is checked
for negative and overlarge values.

This means that if the getsockopt() call returns success but doesn't
actually update the xucred structure, this is now caught. This
happened previously when getsockopt was called with SOL_SOCKET
instead of SOL_LOCAL, prior to commit 5a468b38, and resulted in
random uids being accepted.
Signed-off-by: NEric Blake <eblake@redhat.com>

Since 5a468b38 we use SOL_LOCAL for the 2nd argument of getsockopt()
however Lion added the define SOL_LOCAL set to 0, which is the value to
the 2nd argument of getsockopt() for Unix sockets on Mac OS X. So
instead of using the define just pass 0 so we restore compatibility
with Snow Leopard and Leopard.

Reported at https://github.com/mxcl/homebrew/pull/23141

This fixes the following error:
  error : virGetUserEnt:703 : Failed to find user record for uid '32654'

'32654' (it's random and varies) comes from getsockopt with
LOCAL_PEERCRED option. getsockopt returns w/o error but seems
to not set any value to the buffer for uid.

For Mac OS X, LOCAL_PEERCRED has to be used with SOL_LOCAL level.
With SOL_LOCAL, getsockopt returns a correct uid.

Note that SOL_LOCAL can be found in
/System/Library/Frameworks/Kernel.framework/Versions/A/Headers/sys/un.h.
Signed-off-by: NRyota Ozaki <ozaki.ryota@gmail.com>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

While BSDs don't support process creation timestamp information via
PEERCRED for Unix sockets, we need to actually initialize the value
because it is used by the libvirt code.

Ensure that the socket credentials we got back on BSD are valid before
using them.

To allow creation of a virNetSocketPtr instance from a pre-opened
socketpair FD, add a virNetSocketNewConnectSockFD method.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

This patch enables the password authentication in the libssh2 connection
driver. There are a few benefits to this step:

1) Hosts with challenge response authentication will now be supported
with the libssh2 connection driver.

2) Credential for hosts can now be stored in the authentication
credential config file

Convert the type of loop iterators named 'i', 'j', k',
'ii', 'jj', 'kk', to be 'size_t' instead of 'int' or
'unsigned int', also santizing 'ii', 'jj', 'kk' to use
the normal 'i', 'j', 'k' naming
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Since PIDs can be reused, polkit prefers to be given
a (PID,start time) pair. If given a PID on its own,
it will attempt to lookup the start time in /proc/pid/stat,
though this is subject to races.

It is safer if the client app resolves the PID start
time itself, because as long as the app has the client
socket open, the client PID won't be reused.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

There are various methods named "virXXXXSecurityContext",
which are specific to SELinux. Rename them all to
"virXXXXSELinuxContext". They will still raise errors at
runtime if SELinux is not compiled in
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The F_DUPFD_CLOEXEC operation with fcntl() expects a single
int argument, specifying the minimum FD number for the newly
dup'd file descriptor. We were not specifying that causing
random stack data to be accessed as the FD number. Sometimes
that worked, sometimes it didn't.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The source code base needs to be adapted as well. Some files
include virutil.h just for the string related functions (here,
the include is substituted to match the new file), some include
virutil.h without any need (here, the include is removed), and
some require both.

but libvirt is built with --with-selinux. In this case getpeercon
returns ENOPROTOOPT so don't return an error in that case but simply
don't set seccon.

The virNetSocket & virIdentity classes accidentally got some
conditionals using HAVE_SELINUX instead of WITH_SELINUX.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

A socket object has various pieces of security data associated
with it, such as the SELinux context, the SASL username and
the x509 distinguished name. Add new APIs to virNetServerClient
and related modules to access this data.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

When converting to virObject, the probes on the 'Free' functions
were removed on the basis that there is a probe on virObjectFree
that suffices. This puts a burden on people writing probe scripts
to identify which object is being dispose. This adds back probes
in the 'Dispose' functions and updates the rpc monitor systemtap
example to use them
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Check status when attempting to set SO_REUSEADDR flag on outgoing connection
On failure, VIR_WARN(), but continue to connect. This code path is on the
sender side where the setting is just a hint and would only take effect if
the sender is overflowed with TCP connections.  Inability to set doesn't mean
failure to establish a connection.

Currently all classes must directly inherit from virObject.
This allows for arbitrarily deep hierarchy. There's not much
to this aside from chaining up the 'dispose' handlers from
each class & providing APIs to check types.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Commit 321a7d53 missed a spot.

* src/rpc/virnetsocket.c (virNetSocketPreExecRestart): Use right
conditional.

Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Add checks for existence of GNUTLS and automatically disable
it if not found.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Since the event APIs are now in the public header, no internal
code should include virevent.h

This adds an implementation of virNetSocketGetUNIXIdentity()
using LOCAL_PEERCRED socket option and xucred struct, defined
in <sys/ucred.h> on systems that have it.

The libvirt coding standard is to use 'function(...args...)'
instead of 'function (...args...)'. A non-trivial number of
places did not follow this rule and are fixed in this patch.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Add two new APIs virNetSocketNewPostExecRestart and
virNetSocketPreExecRestart which allow a virNetSocketPtr
object to be created from a JSON object and saved to a
JSON object, for the purpose of re-exec'ing a process.

As well as saving the state in JSON format, the second
method will disable the O_CLOEXEC flag so that the open
file descriptors are preserved across the process re-exec()

Since it is not possible to serialize SASL or TLS encryption
state, an error will be raised if attempting to perform
serialization on non-raw sockets
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Continue consolidation of process functions by moving some
helpers out of command.{c,h} into virprocess.{c,h}
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Change "Pid" to "Process" to align with the virProcessKill
API naming prefix
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

https://www.gnu.org/licenses/gpl-howto.html recommends that
the 'If not, see <url>.' phrase be a separate sentence.

* tests/securityselinuxhelper.c: Remove doubled line.
* tests/securityselinuxtest.c: Likewise.
* globally: s/;  If/.  If/