Design documentation says:
'note string dom0 does not match the $anyvm pattern; all other names do'
This behaviour was broken, because 'is not' in python isn't the same as
string comparison. In theory this could result in some service
erroneously allowed to execute in dom0, but in practice such services are
not installed in dom0 at all, so the only impact was misleading error
message.
FixesQubesOS/qubes-issues#2031
Reported by @Jeeppler
(cherry picked from commit 981a11cee1)
qrexec-client -t/-T (and therefore, qvm-run --pass-io) only handled the
escape character, \033. Everything else, such as Unicode and obscure
control characters, was passed through from the VM to the dom0 terminal.
Instead, replace all bytes except for a benign subset of ASCII. That's
still enough to allow progress bars to be drawn (tested using
"wget --progress=bar:force" and "pv --force").
(cherry picked from commit e005836286)
This will allow to use some different shell/language for a service (for
example python).
Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
(cherry picked from commit f8d23d0d64)
This would prevent qrexec from detecting EOF.
Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
(cherry picked from commit 7b582e0339)
When qrexec-agent crashes for any reason (for example
QubesOS/qubes-issues#1389), it will never connect back and qrexec-client
will wait forever. In worst case it may happen while holding qubes.xml
write lock (in case of DispVM startup) effectively locking the whole
system.
FixesQubesOS/qubes-issues#1636
Otherwise if the child process isn't reading its stdin at that time, it
would deadlock the whole qrexec connection (for example preventing
reading the data from the child, which may be a cause of that deadlock).
QubesOS/qubes-issues#1347
Do not reimplement manual VM state checking in qrexec-policy.
`qubes.xml` is loaded anyway, so just use QubesVM object to check if
domain is running.
FixesQubesOS/qubes-issues#1283
Make sure that all the data from local process is sent (including final
EOF), before handling its exit code - which would include terminating
qrexec-client process.
This will prevent passing an option instead of command (qvm-run) /
domain name (qrexec-policy). In both cases when VM tries to pass some
option it would fail because missing argument then - VM can not pass
additional arguments, so if one act as an option, one argument will be
missing).
This reverts commit 79abec9038.
The problem will not be applicable in new protocol, where vchan
connection is directly between VMs, so there is no longer two connected
qrexec-clients - always one end of data flow in qrexec-client is vchan,
which provide information about amount of data to read or buffer
space to write (lack of the later in case of pipes was a cause of the
original problem).
When VM-VM qrexec service is called, two qrexec-clients are connected in
dom0. If both VMs are sending data simultaneously it can happen that
both qrexec-client processes will call write(2) and none of them will be
reading -> deadlock.
Solve it by handling I/O in two separate threads (one for reading from
VM, another for writing), at any time qrexec-client is ready to accept
data from either direction.
Marek Marczykowski-Górecki