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Previously, it was possible to run sshuttle locally without using ssh
and connecting to a remote server. In this configuration, traffic was
redirected to the sshuttle server running on the localhost. However,
the firewall needed to distinguish between traffic leaving the
sshuttle server and traffic that originated from the machine that
still needed to be routed through the sshuttle server. The TTL of the
packets leaving the sshuttle server were manipulated to indicate to
the firewall what should happen. The TTL was adjusted for all packets
leaving the sshuttle server (even if it wasn't necessary because the
server and client were running on different machines).
Changing the TTL caused trouble and some machines, and
the --ttl option was added as a workaround to change how the TTL was
set for traffic leaving sshuttle. All of this added complexity to the
code for a feature (running the server on localhost) that is likely
only used for testing and rarely used by others.
This commit updates the associated documentation, but doesn't fully
fix the ipfw method since I am unable to test that.
This change will also make sshuttle fail to work if -r is used to
specify a localhost. Pull request #610 partially addresses that issue.
For example, see: #240, #490, #660, #606.
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If pfctl returns non-zero when setting up the firewall, sshuttle exits
and indicates the exit status code. This patch makes it so the output
of pfctl is also printed so the user can get a better idea of what
caused the problem.
For example: issue #491
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Even when --tmark was used, the iptables code always used '1' for the
mark. This patch corrects the problem.
Previously, it wasn't clear if the tmark should be supplied in
hexadecimal or as an integer. This makes it use hexadecimal, checks
that the input is hexadecimal, and updates the associated
documentation.
This patch also makes --ttl information get passed to the firewall in
a way that matches how other information gets passed. The ttl and
tmark information are passed next to each other in many places and
this patch also makes the order consistent.
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In instances where a cluster pod in a local VM needs to access a server
that is sshuttle'd from the host, since the packets arriving at the host
already made a hop, their TTL is 63 and so get ignored by sshuttle.
Allowing an override of the firewall TTL rule allows the packets to go
through.
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This commit rewrites the log() function so that it will append a
newline at the end of the message if none is present. It doesn't make
sense to print a log message without a newline since the next log
message (which will write a prefix) expects to be starting at the
beginning of a line.
Although it isn't strictly necessary, this commit also removes any
newlines at the ends of messages. If I missed any, including the
newline at the end of the message will continue to work as it did
before.
Previously, some calls were missing the newline at the end even though
including it was necessary for subsequent messages to appear
correctly.
This code also cleans up some redundant prefixes. The log() method
will prepend the prefix and the different processes should set their
prefix as soon as they start.
Multiline messages are still supported (although the prefix for the
additional lines was changed to match the length of the prefix used
for the first line).
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Add an "is_supported()" function to the different methods so that each
method can include whatever logic they wish to indicate if they are
supported on a particular machine. Previously, methods/__init__.py
contained all of the logic for selecting individual methods. Now, it
iterates through a list of possible options and stops on the first
method that it finds that is_supported().
Currently, the decision is made based on the presence of programs in
the PATH. In the future, things such as the platform sshuttle is
running on could be considered.
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This patch attempts to fix (or aid in debugging) issue #350.
sshuttle didn't explicitly search /sbin and /usr/sbin and they may be
missing in the user's PATH. If PATH is missing, these folders wouldn't
be searched either. There was also a program_exists function which is
redundant to which(). This consolidates everything into the helpers.py
file.
This patch introduces get_path() to return PATH + some extra hardcoded
paths. A new get_env() function can be called to create a consistent
environment when calling external programs. The new which() wrapper
function also ensures we use the same set of paths.
If -vv is supplied, messages clearly indicate the programs we are
looking for, if they are found, and where we looked if we failed to
find them.
I haven't tested the changes to ipfw or pf.
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* Make hostwatch locale-independent
See #377: hostwatch used to call netstat and parse the result,
without setting the locale.
The problem is converting the binary output to a unicode string,
as the locale may be utf-8, latin-1, or literally anything.
Setting the locale to C avoids this issue, as netstat's source
strings to not use non-ASCII characters.
* Break line, check all other invocations
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* re-organized imports according to pep8
* fixed all remaining pep8 issues
* moved common config into setup.cfg, additionally test `tests`
* removed --select=X -- the errors selected where by default not in
flake8's --ignore list so effectively had no effect
* update .travis.yml to reflect changes in tox.ini
* make travis just use tox in order to avoid code duplaction
* replace py.test with pytest
* fixed .travis.yml
* try different pypy toxenv
* hopefully fixed testenv for pypy
* added pypy basepython, removed unused python2.6
* install dev package before testing (fixes missing coverage)
* fixed empty exception pass blocks with noqa
* Added dummy log message on empty try-except-pass blocks to make dodacy happy :(
* Replaced Exception with BaseException
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Before this change, in pf, exclusions used a pass out quick which gave
them higher precedence than any other rule independent of subnet width.
As reported in #265 this causes exclusion from one instance of sshuttle
to also take effect on other instances because quick aborts the
evaluation of rules across all anchors.
This commit changes the precedence of rules so quick can now be
dropped. The new order is defined by the following rule, from
subnet_weight:
"We need to go from smaller, more specific, port ranges, to larger,
less-specific, port ranges. At each level, we order by subnet
width, from most-specific subnets (largest swidth) to
least-specific. On ties, excludes come first."
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* Fixes support for OpenBSD (6.1+)
As reported in #219, new versions of OpenBSD ship with a different
pfioc_rule struct. This commit adjusts the offset to match the new struct.
* Fixes tests for OpenBSD 6.1+
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When the pf module is not loaded our calls to pfctl will fail with
unhelpful messages.
This change spares the user the pain of decrypting those messages and manually
enabling pf. It also keeps track if pf was loaded by sshuttle and unloads on
exit if that was the case.
Also fixed the case where both ipv4 and ipv6 anchors were added by sshuttle
but the first call of disable would disable pf before the second call had the
chance of cleaning it's anchor.
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When doing port forwarding on lo0 avoid the special case where the
traffic on lo0 did not came from sshuttle pass out rule but from the lo0
address itself. Fixes #159.
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* Adds support for tunneling specific port ranges
This set of changes implements the ability of specifying a port or port
range for an IP or subnet to only tunnel those ports for that subnet.
Also supports excluding a port or port range for a given IP or subnet.
When, for a given subnet, there are intercepting ranges being added and
excluded, the most specific, i.e., smaller range, takes precedence. In
case of a tie the exclusion wins.
For different subnets, the most specific, i.e., largest swidth, takes
precedence independent of any eventual port ranges.
Examples:
Tunnels all traffic to the 188.0.0.0/8 subnet except those to port 443.
```
sshuttle -r <server> 188.0.0.0/8 -x 188.0.0.0/8:443
```
Only tunnels traffic to port 80 of the 188.0.0.0/8 subnet.
```
sshuttle -r <server> 188.0.0.0/8:80
```
Tunnels traffic to the 188.0.0.0/8 subnet and the port range that goes
from 80 to 89.
```
sshuttle -r <server> 188.0.0.0/8:80-89 -x 188.0.0.0/8:80-90
```
* Allow subnets to be specified with domain names
Simplifies the implementation of address parsing by using
socket.getaddrinfo(), which can handle domain resolution, IPv4 and IPv6
addresses. This was proposed and mostly implemented by @DavidBuchanan314
in #146.
Signed-off-by: David Buchanan <DavidBuchanan314@users.noreply.github.com>
Signed-off-by: João Vieira <vieira@yubo.be>
* Also use getaddrinfo for parsing listen addr:port
* Fixes tests for tunneling a port range
* Updates documentation to include port/port range
Adds some examples with subnet:port and subnet:port-port.
Also clarifies the versions of Python supported on the server while
maintaining the recommendation for Python 2.7, 3.5 or later.
Mentions support for pfSense.
* In Py2 only named arguments may follow *expression
Fixes issue in Python 2.7 where *expression may only be followed by
named arguments.
* Use right regex to extract ip4/6, mask and ports
* Tests for parse_subnetport
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PfSense is based on FreeBSD and its pf is pretty close to the one
FreeBSD ships, however some structures have different fields and two
offsets had to be fixed.
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We set it to true when we enable pf, but do not set it back to False
after disabling. When using IPv4 and IPv6 we end up trying to disable
twice which procudes an error while undoing changes in FreeBSD 11.
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By just splitting at spaces, multi-word arguments are torn apart even if
quoted. In case of custom ssh-cmd, this makes it practically impossible
to set certian options through `ssh -o`.
shlex splits arguments like a shell and e.g. respects quotes.
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Adds IPv6 support for OpenBSD and OSX.
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Fixes bug where all traffic routed to loopback would end up being diverted to the same port.
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Otherwise the output can vary and confuse our attempts to parse it.
Fixes: 93
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In some cases (see #43) it seems that some network configurations may
end up setting a skip on lo. As sshuttle adds rules that rely on
filtering/translating packets on lo, this causes problem. This fix
overrides the skip and makes the rules be applied again.
Should fix at least some of the problems reported on #43.
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This will make it easier to support other platforms/versions in the
future, e.g., OpenBSD.
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The PF firewall that is included in the FreeBSD base system does not
have exactly the same data structures as the OSX version. This commit
fixes the offsets and some field types that are also different. Tested
with FreeBSD 10.2 and OSX 10.11.2.
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Also support multiline debug output better.
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* setup_firewall sets the firewall up.
* restore_firewall restores the firewall to initial state.
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Closes: #36.
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Pull out firewall methods code into seperate files.
Fix problems starting with method=='auto'; we were making decisions
based on the method, before the method had been finalized by the
firewall.
Only very basic testing so far. What could go wrong?
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