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Added prompt command to fix your prompt in the event of a simple shell like dash
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README.md
14
README.md
@ -132,9 +132,15 @@ terminal escape sequences which `pwncat` adds, so you may get a very long termin
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\[\033[01;31m\](remote)\[\033[00m\] \[\033[01;33m\]\u@\h\[\033[00m\]:\[\033[01;36m\]\w\[\033[00m\]$
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```
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We are currently trying to figure out an acceptible way of handling with. `dash` (and other
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minimalist shells) are capable of handling terminal escape sequences for color, but inserting
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things like user and host name automatically are unsupported.
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Currently, the only workaround is to use the `prompt` command at the local `pwncat` prompt.
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The command allows you to modify the prompt which `pwncat` will automatically set whenever
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resetting the remote terminal. Two options are provided: "basic" and "fancy". The "fancy"
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prompt is the default which causes the above output in Dash. To switch to the basic prompt
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you can use the following command at the `pwncat` prompt:
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```shell script
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prompt --basic
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```
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While this is inconvenient, it does not affect the behaviour of `pwncat`. All `pwncat`
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features will continue to function properly.
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features will continue to function properly no matter what your prompt looks like.
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45
pwncat/commands/prompt.py
Normal file
45
pwncat/commands/prompt.py
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@ -0,0 +1,45 @@
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#!/usr/bin/env python3
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import pwncat
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from pwncat.commands.base import CommandDefinition, Parameter, Complete, Group
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class Command(CommandDefinition):
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"""
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Reset the prompt used for shells in pwncat. This allows you to choose
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between the fancier colored prompt and more basic prompt. You can
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also specify a custom prompt if you'd like.
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This is mainly useful for basic shells such as /bin/sh or /bin/dash
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which do not support the nicer prompts by default.
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"""
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PROG = "prompt"
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GROUPS = {"mutex": Group(mutex=True, required=True)}
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ARGS = {
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"--basic,-b": Parameter(
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Complete.NONE,
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group="mutex",
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action="store_true",
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help="Set a basic prompt with no color or automatic system information",
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),
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"--fancy,-f": Parameter(
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Complete.NONE,
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group="mutex",
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action="store_true",
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help="Set a fancier prompt including auto-user, hostname, cwd information",
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),
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}
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def run(self, args):
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if args.fancy:
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pwncat.victim.remote_prefix = "\\[\\033[01;31m\\](remote)\\[\\033[00m\\]"
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pwncat.victim.remote_prompt = (
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"\\[\\033[01;33m\\]\\u@\\h\\[\\033[00m\\]:\\["
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"\\033[01;36m\\]\\w\\[\\033[00m\\]\\$ "
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)
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else:
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pwncat.victim.remote_prefix = "(remote)"
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pwncat.victim.remote_prompt = f"{pwncat.victim.host.ip}:$PWD\\$ "
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pwncat.victim.reset(hard=False)
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@ -89,9 +89,7 @@ def enumerate() -> Generator[FactData, None, None]:
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for i in range(0, len(data), 5):
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if i >= (len(data) - 4):
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print(data[i:])
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break
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print(data[i : i + 4])
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name = data[i + 2].strip().rstrip(".service")
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pid = int(data[i].strip())
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if "[not set]" in data[i + 1]:
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@ -707,6 +707,9 @@ class Finder:
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# Attempt to escalate with the local persistence method
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if persist.escalate(target_user):
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# Stabilize the terminal
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pwncat.victim.reset(hard=False)
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# The method thought it worked, but didn't appear to
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if pwncat.victim.update_user() != target_user:
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if pwncat.victim.getenv("SHLVL") != shlvl:
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@ -738,6 +741,7 @@ class Finder:
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tech, exit_command = self.escalate_single(
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techniques[target_user], shlvl
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)
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pwncat.victim.reset(hard=False)
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pwncat.victim.update_user()
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chain.append((tech, exit_command))
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return chain
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@ -753,6 +757,11 @@ class Finder:
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f"checking local persistence implants: {persist.format(user)}"
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)
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if persist.escalate(user):
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# Ensure history and prompt are correct
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pwncat.victim.reset(hard=False)
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# Update the current user
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if pwncat.victim.update_user() != user:
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if pwncat.victim.getenv("SHLVL") != shlvl:
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pwncat.victim.run("exit", wait=False)
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@ -780,6 +789,8 @@ class Finder:
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try:
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tech, exit_command = self.escalate_single(techs, shlvl)
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chain.append((tech, exit_command))
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pwncat.victim.reset(hard=False)
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pwncat.victim.update_user()
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except PrivescError:
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continue
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try:
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@ -22,7 +22,7 @@ class Method(BaseMethod):
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"""
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for fact in pwncat.victim.enumerate.iter("system.service"):
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if "ssh" in fact.data.name and fact.data.running:
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if "ssh" in fact.data.name and fact.data.state == "running":
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break
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else:
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raise PrivescError("no sshd service running")
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@ -1459,13 +1459,17 @@ class Victim:
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return output
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def reset(self):
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def reset(self, hard: bool = True):
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"""
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Reset the remote terminal using the ``reset`` command. This also restores
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your prompt, and sets up the environment correctly for ``pwncat``.
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:param hard: whether to actually call the `reset` command.
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This prevents a long pause when we simply need to reset other
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things such as the prompt, aliases or history control.
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"""
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self.run("reset", wait=False)
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if hard:
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self.run("reset", wait=False)
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self.has_cr = True
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self.has_echo = True
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self.run("unset HISTFILE; export HISTCONTROL=ignorespace")
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