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  1. 06 4月, 2009 4 次提交
  3. 28 3月, 2009 2 次提交
  5. 09 3月, 2009 1 次提交
  7. 07 3月, 2009 4 次提交
    • A
      Support ACLs for controlling VNC access ("Daniel P. Berrange") · 76655d6d
      由 aliguori 提交于 
      This patch introduces a generic internal API for access control lists
to be used by network servers in QEMU. It adds support for checking
these ACL in the VNC server, in two places. The first ACL is for the
SASL authentication mechanism, checking the SASL username. This ACL
is called 'vnc.username'. The second is for the TLS authentication
mechanism, when x509 client certificates are turned on, checking against
the Distinguished Name of the client. This ACL is called 'vnc.x509dname'

The internal API provides for an ACL with the following characteristics

 - A unique name, eg  vnc.username, and vnc.x509dname.
 - A default policy, allow or deny
 - An ordered series of match rules, with allow or deny policy

If none of the match rules apply, then the default policy is
used.

There is a monitor API to manipulate the ACLs, which I'll describe via
examples

  (qemu) acl show vnc.username
  policy: allow
  (qemu) acl policy vnc.username denya
  acl: policy set to 'deny'
  (qemu) acl allow vnc.username fred
  acl: added rule at position 1
  (qemu) acl allow vnc.username bob
  acl: added rule at position 2
  (qemu) acl allow vnc.username joe 1
  acl: added rule at position 1
  (qemu) acl show vnc.username
  policy: deny
  0: allow fred
  1: allow joe
  2: allow bob


  (qemu) acl show vnc.x509dname
  policy: allow
  (qemu) acl policy vnc.x509dname deny
  acl: policy set to 'deny'
  (qemu) acl allow vnc.x509dname C=GB,O=ACME,L=London,CN=*
  acl: added rule at position 1
  (qemu) acl allow vnc.x509dname C=GB,O=ACME,L=Boston,CN=bob
  acl: added rule at position 2
  (qemu) acl show vnc.x509dname
  policy: deny
  0: allow C=GB,O=ACME,L=London,CN=*
  1: allow C=GB,O=ACME,L=Boston,CN=bob

By default the VNC server will not use any ACLs, allowing access to
the server if the user successfully authenticates. To enable use of
ACLs to restrict user access, the ',acl' flag should be given when
starting QEMU. The initial ACL activated will be a 'deny all' policy
and should be customized using monitor commands.

eg enable SASL auth and ACLs

    qemu ....  -vnc localhost:1,sasl,acl

The next patch will provide a way to load a pre-defined ACL when
starting up


 Makefile        |    6 +
 b/acl.c         |  185 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 b/acl.h         |   74 ++++++++++++++++++++++
 configure       |   18 +++++
 monitor.c       |   95 ++++++++++++++++++++++++++++
 qemu-doc.texi   |   49 ++++++++++++++
 vnc-auth-sasl.c |   16 +++-
 vnc-auth-sasl.h |    7 ++
 vnc-tls.c       |   19 +++++
 vnc-tls.h       |    3 
 vnc.c           |   21 ++++++
 vnc.h           |    3 
 12 files changed, 491 insertions(+), 5 deletions(-)
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6726 c046a42c-6fe2-441c-8c8c-71466251a162
      76655d6d
    • A
      Add SASL authentication support ("Daniel P. Berrange") · 2f9606b3
      由 aliguori 提交于 
      This patch adds the new SASL authentication protocol to the VNC server.

It is enabled by setting the 'sasl' flag when launching VNC. SASL can
optionally provide encryption via its SSF layer, if a suitable mechanism
is configured (eg, GSSAPI/Kerberos, or Digest-MD5).  If an SSF layer is
not available, then it should be combined with the x509 VNC authentication
protocol which provides encryption.

eg, if using GSSAPI

   qemu -vnc localhost:1,sasl

eg if using  TLS/x509 for encryption

   qemu -vnc localhost:1,sasl,tls,x509


By default the Cyrus SASL library will look for its configuration in
the file /etc/sasl2/qemu.conf.  For non-root users, this can be overridden
by setting the SASL_CONF_PATH environment variable, eg to make it look in
$HOME/.sasl2.  NB unprivileged users may not have access to the full range
of SASL mechanisms, since some of them require some administrative privileges
to configure. The patch includes an example SASL configuration file which
illustrates config for GSSAPI and Digest-MD5, though it should be noted that
the latter is not really considered secure any more.

Most of the SASL authentication code is located in a separate source file,
vnc-auth-sasl.c.  The main vnc.c file only contains minimal integration
glue, specifically parsing of command line flags / setup, and calls to
start the SASL auth process, to do encoding/decoding for data.

There are several possible stacks for reading & writing of data, depending
on the combo of VNC authentication methods in use

 - Clear.    read/write straight to socket
 - TLS.      read/write via GNUTLS helpers
 - SASL.     encode/decode via SASL SSF layer, then read/write to socket
 - SASL+TLS. encode/decode via SASL SSF layer, then read/write via GNUTLS

Hence, the vnc_client_read & vnc_client_write methods have been refactored
a little.

   vnc_client_read:  main entry point for reading, calls either

       - vnc_client_read_plain   reading, with no intermediate decoding
       - vnc_client_read_sasl    reading, with SASL SSF decoding

   These two methods, then call vnc_client_read_buf(). This decides
   whether to write to the socket directly or write via GNUTLS.

The situation is the same for writing data. More extensive comments
have been added in the code / patch. The vnc_client_read_sasl and
vnc_client_write_sasl method implementations live in the separate
vnc-auth-sasl.c file.

The state required for the SASL auth mechanism is kept in a separate
VncStateSASL struct, defined in vnc-auth-sasl.h and included in the
main VncState.

The configure script probes for SASL and automatically enables it
if found, unless --disable-vnc-sasl was given to override it.


 Makefile            |    7 
 Makefile.target     |    5 
 b/qemu.sasl         |   34 ++
 b/vnc-auth-sasl.c   |  626 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 b/vnc-auth-sasl.h   |   67 +++++
 configure           |   34 ++
 qemu-doc.texi       |   97 ++++++++
 vnc-auth-vencrypt.c |   12 
 vnc.c               |  249 ++++++++++++++++++--
 vnc.h               |   31 ++
 10 files changed, 1129 insertions(+), 33 deletions(-)
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6724 c046a42c-6fe2-441c-8c8c-71466251a162
      2f9606b3
    • A
      Move TLS auth into separate file ("Daniel P. Berrange") · 5fb6c7a8
      由 aliguori 提交于 
      This patch refactors the existing TLS code to make the main VNC code
more managable. The code moves to two new files

 - vnc-tls.c: generic helpers for TLS handshake & credential setup
 - vnc-auth-vencrypt.c: the actual VNC TLS authentication mechanism.

The reason for this split is that there are other TLS based auth
mechanisms which we may like to use in the future. These can all
share the same vnc-tls.c routines. In addition this will facilitate
anyone who may want to port the vnc-tls.c file to allow for choice
of GNUTLS & NSS for impl.

The TLS state is moved out of the VncState struct, and into a separate
VncStateTLS struct, defined in vnc-tls.h. This is then referenced from
the main VncState. End size of the struct is the same, but it keeps
things a little more managable.

The vnc.h file gains a bunch more function prototypes, for functions
in vnc.c that were previously static, but now need to be accessed
from the separate auth code files.

The only TLS related code still in the main vl.c is the command line
argument handling / setup, and the low level I/O routines calling
gnutls_send/recv.


 Makefile              |   11 
 b/vnc-auth-vencrypt.c |  167 ++++++++++++++
 b/vnc-auth-vencrypt.h |   33 ++
 b/vnc-tls.c           |  414 +++++++++++++++++++++++++++++++++++
 b/vnc-tls.h           |   70 ++++++
 vnc.c                 |  581 +++-----------------------------------------------
 vnc.h                 |   76 ++++--
 7 files changed, 780 insertions(+), 572 deletions(-)
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6723 c046a42c-6fe2-441c-8c8c-71466251a162
      5fb6c7a8
    • A
      Refactor keymap code to avoid duplication ("Daniel P. Berrange") · 0483755a
      由 aliguori 提交于 
      Each of the graphical frontends #include a .c file, for keymap code
resulting in duplicated definitions & duplicated compiled code. A
couple of small changes allowed this to be sanitized, so instead of
doing a #include "keymaps.c", duplicating all code, we can have a
shared keymaps.h file, and only compile code once. This allows the
next patch to move the VncState struct out into a header file without
causing clashing definitions.


 Makefile      |    9 +++++---
 b/keymaps.h   |   60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 curses.c      |    3 --
 curses_keys.h |    9 +++-----
 keymaps.c     |   45 ++++++++++++++++---------------------------
 sdl.c         |    3 --
 sdl_keysym.h  |    7 ++----
 vnc.c         |    5 +---
 vnc_keysym.h  |    7 ++----
 9 files changed, 97 insertions(+), 51 deletions(-)
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6721 c046a42c-6fe2-441c-8c8c-71466251a162
      0483755a
  9. 27 1月, 2009 1 次提交
  11. 23 1月, 2009 1 次提交
  13. 22 1月, 2009 5 次提交
  15. 09 1月, 2009 1 次提交
  17. 03 1月, 2009 1 次提交
  19. 16 12月, 2008 1 次提交
  21. 13 12月, 2008 1 次提交
    • A
      Replace posix-aio with custom thread pool · 3c529d93
      由 aliguori 提交于 
      glibc implements posix-aio as a thread pool and imposes a number of limitations.

1) it limits one request per-file descriptor.  we hack around this by dup()'ing
file descriptors which is hideously ugly

2) it's impossible to add new interfaces and we need a vectored read/write
operation to properly support a zero-copy API.

What has been suggested to me by glibc folks, is to implement whatever new
interfaces we want and then it can eventually be proposed for standardization.
This requires that we implement our own posix-aio implementation though.

This patch implements posix-aio using pthreads.  It immediately eliminates the
need for fd pooling.

It performs at least as well as the current posix-aio code (in some
circumstances, even better).
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5996 c046a42c-6fe2-441c-8c8c-71466251a162
      3c529d93
  23. 11 12月, 2008 1 次提交
  25. 07 12月, 2008 1 次提交
  27. 27 11月, 2008 1 次提交
  29. 23 11月, 2008 1 次提交
  31. 12 11月, 2008 2 次提交
  33. 09 10月, 2008 1 次提交
    • A
      Fix IO performance regression in sparc · 9e472e10
      由 aliguori 提交于 
      Replace signalfd with signal handler/pipe.  There is no way to interrupt
the CPU execution loop when a file descriptor becomes readable.  This
results in a large performance regression in sparc emulation during
bootup.
   
This patch switches us to signal handler/pipe which was originally
suggested by Ian Jackson.  The signal handler lets us interrupt the
CPU emulation loop while the write to a pipe lets us avoid the
select/signal race condition.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5451 c046a42c-6fe2-441c-8c8c-71466251a162
      9e472e10
  35. 02 10月, 2008 1 次提交
  37. 29 9月, 2008 7 次提交
  39. 24 9月, 2008 1 次提交
  41. 23 9月, 2008 1 次提交
    • A
      Refactor AIO to allow multiple AIO implementations · a76bab49
      由 aliguori 提交于 
      This patch refactors the AIO layer to allow multiple AIO implementations.  It's
only possible because of the recent signalfd() patch.  

Right now, the AIO infrastructure is pretty specific to the block raw backend.
For other block devices to implement AIO, the qemu_aio_wait function must
support registration.  This patch introduces a new function,
qemu_aio_set_fd_handler, which can be used to register a file descriptor to be
called back.  qemu_aio_wait() now polls a set of file descriptors registered
with this function until one becomes readable or writable.

This patch should allow the implementation of alternative AIO backends (via a
thread pool or linux-aio) and AIO backends in non-traditional block devices
(like NBD).
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5297 c046a42c-6fe2-441c-8c8c-71466251a162
      a76bab49
  43. 15 9月, 2008 1 次提交
    • A
      Use common objects for qemu-img and qemu-nbd · 03ff3ca3
      由 aliguori 提交于 
      Right now, we sprinkle #if defined(QEMU_IMG) && defined(QEMU_NBD) all over the
code.  It's ugly and causes us to have to build multiple object files for
linking against qemu and the tools.

This patch introduces a new file, qemu-tool.c which contains enough for
qemu-img, qemu-nbd, and QEMU to all share the same objects.

This also required getting qemu-nbd to be a bit more Windows friendly.  I also
changed the Windows block-raw to use normal IO instead of overlapping IO since
we don't actually do AIO yet on Windows.  I changed the various #if 0's to
 #if WIN32_AIO to make it easier for someone to eventually fix AIO on Windows.

After this patch, there are no longer any #ifdef's related to qemu-img and
qemu-nbd.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5226 c046a42c-6fe2-441c-8c8c-71466251a162
      03ff3ca3