def execute(cmd_tokens, syscall_filters):
with open(HISTORY_PATH, 'a') as history_file:
history_file.write(' '.join(cmd_tokens) + os.linesep)
if cmd_tokens:
# Extract command name and arguments from tokens
cmd_name = cmd_tokens[0]
cmd_args = cmd_tokens[1:]
DIRFD_ARGUMENTS.clear()
SYSCALL_ARG_DICT.clear()
ARGUMENT_CALLBACK.clear()
# If the command is a built-in command,
# invoke its function with arguments
if cmd_name in built_in_cmds:
return built_in_cmds[cmd_name](cmd_args)
# Wait for a kill signal
signal.signal(signal.SIGINT, handler_kill)
try:
# Spawn a child process
cmd_tokens[0] = locateProgram(cmd_tokens[0])
pid = createChild(cmd_tokens, False)
except Exception as error:
print("Error %s executing %s" % (error, cmd_name))
return 1
debugger = ptrace.debugger.PtraceDebugger()
debugger.traceFork()
debugger.traceExec()
process = debugger.addProcess(pid, True)
process.syscall()
snapshots = None
try:
snapshots, exit_code = debug_process(debugger, syscall_filters)
if exit_code != 0:
print('Command unsuccessful - rollbacking changes')
snapshots.rollback_all()
except Exception as error:
print("Error tracing process: %s." % error)
return SHELL_STATUS_STOP
except KeyboardInterrupt:
print("%s terminated by keyboard interrupt." % cmd_name)
return SHELL_STATUS_STOP
finally:
# Cut down all processes no matter what happens
# to prevent them from doing any damage
debugger.quit()
if snapshots is not None:
snapshots.clean()
# Return status indicating to wait for next command in shell_loop
return SHELL_STATUS_RUN
def main():
sys.argv = sys.argv[1:]
filter_scopes = SYSCALL_FILTERS.keys()
syscall_filters = {}
for filter_scope in SYSCALL_FILTERS:
if filter_scope in filter_scopes:
for syscall in SYSCALL_FILTERS[filter_scope]:
syscall_filters[syscall] = SYSCALL_FILTERS[filter_scope][
syscall]
# Suppress logging output from python-ptrace
getLogger().addHandler(NullHandler())
# Prevent python-ptrace from decoding arguments to keep raw numerical values
DIRFD_ARGUMENTS.clear()
SYSCALL_ARG_DICT.clear()
ARGUMENT_CALLBACK.clear()
try:
sys.argv[0] = locateProgram(sys.argv[0])
pid = createChild(sys.argv, False)
except Exception as error:
print(f"Error executing {sys.argv}: {error}.")
return 1
debugger = PtraceDebugger()
debugger.traceFork()
debugger.traceExec()
process = debugger.addProcess(pid, True)
process.syscall()
try:
operations = get_operations(debugger, syscall_filters, True)
except Exception as error:
print(f"Error tracing process: {error}.")
return 1
finally:
# Cut down all processes no matter what happens
# to prevent them from doing any damage
debugger.quit()
if operations:
for operation in operations:
print(" " + operation)
else:
print(f"Not detected any file system operations from: {sys.argv}")
def main(argv=sys.argv[1:]):
if PY2:
argv = [unicode(arg, sys.getfilesystemencoding()) for arg in argv] # noqa
# Insert positional argument separator, if not already present
if "--" not in argv:
for i, argument in enumerate(argv):
if not argument.startswith("-"):
argv.insert(i, "--")
break
arg_parser = ArgumentParser(
prog="maybe",
usage="%(prog)s [options] command [argument ...]",
description="Run a command without the ability to make changes to your system " +
"and list the changes it would have made.",
epilog="For more information, to report issues or to contribute, " +
"visit https://github.com/p-e-w/maybe.",
)
arg_parser.add_argument("command", nargs="+", help="the command to run under maybe's control")
arg_group = arg_parser.add_mutually_exclusive_group()
arg_group.add_argument("-a", "--allow", nargs="+", metavar="OPERATION",
help="allow the command to perform the specified operation(s). " +
"all other operations will be denied. " +
"possible values for %(metavar)s are: " +
", ".join(sorted(SYSCALL_FILTERS.keys())) +
"; as well as any filter scopes defined by loaded plugins")
arg_group.add_argument("-d", "--deny", nargs="+", metavar="OPERATION",
help="deny the command the specified operation(s). " +
"all other operations will be allowed. " +
"see --allow for a list of possible values for %(metavar)s. " +
"--allow and --deny cannot be combined")
arg_parser.add_argument("-p", "--plugin", nargs="+", metavar="FILE",
help="load the specified plugin script(s). " +
"see the README for details and plugin API documentation")
arg_parser.add_argument("-l", "--list-only", action="store_true",
help="list operations without header, indentation and rerun prompt")
arg_parser.add_argument("--style-output", choices=["yes", "no", "auto"], default="auto",
help="colorize output using ANSI escape sequences (yes/no) " +
"or automatically decide based on whether stdout is a terminal (auto, default)")
arg_parser.add_argument("-v", "--verbose", action="count",
help="if specified once, print every filtered syscall. " +
"if specified twice, print every syscall, highlighting filtered syscalls")
arg_parser.add_argument("--version", action="version", version="%(prog)s 0.4.0")
args = arg_parser.parse_args(argv)
initialize_terminal(args.style_output)
if args.plugin is not None:
for plugin_path in args.plugin:
try:
module_name = splitext(basename(plugin_path))[0]
# Note: imp.load_source is *long* deprecated and not even documented
# in Python 3 anymore, but it still seems to work and the "alternatives"
# (see http://stackoverflow.com/a/67692) are simply too insane to use
load_source(module_name, plugin_path)
except Exception as error:
print(T.red("Error loading %s: %s." % (T.bold(plugin_path) + T.red, error)))
return 1
if args.allow is not None:
for filter_scope in args.allow:
if filter_scope not in SYSCALL_FILTERS:
print(T.red("Unknown operation in --allow: %s." % (T.bold(filter_scope) + T.red)))
return 1
filter_scopes = set(SYSCALL_FILTERS.keys()) - set(args.allow)
elif args.deny is not None:
for filter_scope in args.deny:
if filter_scope not in SYSCALL_FILTERS:
print(T.red("Unknown operation in --deny: %s." % (T.bold(filter_scope) + T.red)))
return 1
filter_scopes = args.deny
else:
filter_scopes = SYSCALL_FILTERS.keys()
syscall_filters = {}
for filter_scope in SYSCALL_FILTERS:
if filter_scope in filter_scopes:
for syscall in SYSCALL_FILTERS[filter_scope]:
syscall_filters[syscall] = SYSCALL_FILTERS[filter_scope][syscall]
# Suppress logging output from python-ptrace
getLogger().addHandler(NullHandler())
# Prevent python-ptrace from decoding arguments to keep raw numerical values
DIRFD_ARGUMENTS.clear()
SYSCALL_ARG_DICT.clear()
ARGUMENT_CALLBACK.clear()
# This is basically "shlex.join"
command = " ".join([(("'%s'" % arg) if (" " in arg) else arg) for arg in args.command])
try:
args.command[0] = locateProgram(args.command[0])
pid = createChild(args.command, False)
except Exception as error:
print(T.red("Error executing %s: %s." % (T.bold(command) + T.red, error)))
return 1
debugger = PtraceDebugger()
debugger.traceFork()
debugger.traceExec()
process = debugger.addProcess(pid, True)
process.syscall()
try:
operations = get_operations(debugger, syscall_filters, args.verbose)
except Exception as error:
print(T.red("Error tracing process: %s." % error))
return 1
except KeyboardInterrupt:
print(T.yellow("%s terminated by keyboard interrupt." % (T.bold(command) + T.yellow)))
return 2
finally:
# Cut down all processes no matter what happens
# to prevent them from doing any damage
debugger.quit()
if operations:
if not args.list_only:
print("%s has prevented %s from performing %d file system operations:\n" %
(T.bold("maybe"), T.bold(command), len(operations)))
for operation in operations:
print(("" if args.list_only else " ") + operation)
if not args.list_only:
print("\nDo you want to rerun %s and permit these operations? [y/N] " % T.bold(command), end="")
try:
choice = input()
except KeyboardInterrupt:
choice = ""
# Ctrl+C does not print a newline automatically
print("")
if choice.lower() == "y":
subprocess.call(args.command)
else:
print("%s has not detected any file system operations from %s." %
(T.bold("maybe"), T.bold(command)))
from ptrace.syscall.posix_constants import SYSCALL_ARG_DICT
RLIMIT_RESOURCE = {
0: "RLIMIT_CPU",
1: "RLIMIT_FSIZE",
2: "RLIMIT_DATA",
3: "RLIMIT_STACK",
4: "RLIMIT_CORE",
5: "RLIMIT_RSS",
6: "RLIMIT_MEMLOCK",
7: "RLIMIT_NPROC",
8: "RLIMIT_NOFILE",
9: "RLIMIT_SBSIZE",
10: "RLIMIT_VMEM",
}
SIGPROCMASK_HOW = {1: " SIG_BLOCK", 2: "SIG_UNBLOCK", 3: "SIG_SETMASK"}
SYSCALL_ARG_DICT.update(
{
"getrlimit": {"resource": RLIMIT_RESOURCE},
"setrlimit": {"resource": RLIMIT_RESOURCE},
"sigprocmask": {"how": SIGPROCMASK_HOW},
"rt_sigprocmask": {"how": SIGPROCMASK_HOW},
}
)
def main(argv=sys.argv[1:]):
filter_scopes = sorted(SYSCALL_FILTERS.keys())
# Insert positional argument separator, if not already present
if "--" not in argv:
for i, argument in enumerate(argv):
if not argument.startswith("-"):
argv.insert(i, "--")
break
arg_parser = ArgumentParser(
prog="maybe",
usage="%(prog)s [options] command [argument ...]",
description=
"Run a command without the ability to make changes to your system " +
"and list the changes it would have made.",
epilog="For more information, to report issues or to contribute, " +
"visit https://github.com/p-e-w/maybe.",
)
arg_parser.add_argument("command",
nargs="+",
help="the command to run under maybe's control")
arg_group = arg_parser.add_mutually_exclusive_group()
arg_group.add_argument(
"-a",
"--allow",
nargs="+",
choices=filter_scopes,
metavar="OPERATION",
help="allow the command to perform the specified operation(s). " +
"all other operations will be denied. " +
"possible values for %(metavar)s are: %(choices)s")
arg_group.add_argument(
"-d",
"--deny",
nargs="+",
choices=filter_scopes,
metavar="OPERATION",
help="deny the command the specified operation(s). " +
"all other operations will be allowed. " +
"see --allow for a list of possible values for %(metavar)s. " +
"--allow and --deny cannot be combined")
arg_parser.add_argument(
"-l",
"--list-only",
action="store_true",
help="list operations without header, indentation and rerun prompt")
arg_parser.add_argument(
"--style-output",
choices=["yes", "no", "auto"],
default="auto",
help="colorize output using ANSI escape sequences (yes/no) " +
"or automatically decide based on whether stdout is a terminal (auto, default)"
)
arg_parser.add_argument(
"-v",
"--verbose",
action="count",
help="if specified once, print every filtered syscall. " +
"if specified twice, print every syscall, highlighting filtered syscalls"
)
arg_parser.add_argument("--version",
action="version",
version="%(prog)s 0.4.0")
args = arg_parser.parse_args(argv)
initialize_terminal(args.style_output)
if args.allow is not None:
filter_scopes = set(filter_scopes) - set(args.allow)
elif args.deny is not None:
filter_scopes = args.deny
syscall_filters = {}
for filter_scope in filter_scopes:
for syscall in SYSCALL_FILTERS[filter_scope]:
syscall_filters[syscall] = SYSCALL_FILTERS[filter_scope][syscall]
# Prevent python-ptrace from decoding arguments to keep raw numerical values
DIRFD_ARGUMENTS.clear()
SYSCALL_ARG_DICT.clear()
ARGUMENT_CALLBACK.clear()
# This is basically "shlex.join"
command = " ".join([(("'%s'" % arg) if (" " in arg) else arg)
for arg in args.command])
try:
args.command[0] = locateProgram(args.command[0])
pid = createChild(args.command, False)
except Exception as error:
print(
T.red("Error executing %s: %s." %
(T.bold(command) + T.red, error)))
return 1
debugger = PtraceDebugger()
debugger.traceFork()
debugger.traceExec()
process = debugger.addProcess(pid, True)
process.syscall()
try:
operations = get_operations(debugger, syscall_filters, args.verbose)
except Exception as error:
print(T.red("Error tracing process: %s." % error))
return 1
except KeyboardInterrupt:
print(
T.yellow("%s terminated by keyboard interrupt." %
(T.bold(command) + T.yellow)))
return 2
finally:
# Cut down all processes no matter what happens
# to prevent them from doing any damage
debugger.quit()
if operations:
if not args.list_only:
print(
"%s has prevented %s from performing %d file system operations:\n"
% (T.bold("maybe"), T.bold(command), len(operations)))
for operation in operations:
print(("" if args.list_only else " ") + operation)
if not args.list_only:
try:
choice = input(
"\nDo you want to rerun %s and permit these operations? [y/N] "
% T.bold(command))
except KeyboardInterrupt:
choice = ""
# Ctrl+C does not print a newline automatically
print("")
if choice.lower() == "y":
subprocess.call(args.command)
else:
print("%s has not detected any file system operations from %s." %
(T.bold("maybe"), T.bold(command)))
# Register filtered syscalls with python-ptrace so they are parsed correctly
SYSCALL_PROTOTYPES.clear()
FILENAME_ARGUMENTS.clear()
for syscall_filter in SYSCALL_FILTERS:
SYSCALL_PROTOTYPES[syscall_filter.name] = syscall_filter.signature
for argument in syscall_filter.signature[1]:
if argument[0] == "const char *":
FILENAME_ARGUMENTS.add(argument[1])
# Turn list into dictionary indexed by syscall name for fast filter retrieval
SYSCALL_FILTERS = {syscall_filter.name: syscall_filter for syscall_filter in SYSCALL_FILTERS}
# Prevent python-ptrace from decoding arguments to keep raw numerical values
SYSCALL_ARG_DICT.clear()
ARGUMENT_CALLBACK.clear()
def prepareProcess(process):
process.syscall()
process.syscall_state.ignore_callback = lambda syscall: syscall.name not in SYSCALL_FILTERS
def parse_argument(argument):
argument = argument.createText()
if argument.startswith(("'", '"')):
# Remove quotes from string argument
return argument[1:-1]
elif argument.startswith(("b'", 'b"')):
# Python 3 bytes literal
from ptrace.syscall.posix_constants import SYSCALL_ARG_DICT
RLIMIT_RESOURCE = {
0: "RLIMIT_CPU",
1: "RLIMIT_FSIZE",
2: "RLIMIT_DATA",
3: "RLIMIT_STACK",
4: "RLIMIT_CORE",
5: "RLIMIT_RSS",
6: "RLIMIT_MEMLOCK",
7: "RLIMIT_NPROC",
8: "RLIMIT_NOFILE",
9: "RLIMIT_SBSIZE",
10: "RLIMIT_VMEM",
}
SIGPROCMASK_HOW = {1:" SIG_BLOCK", 2: "SIG_UNBLOCK", 3: "SIG_SETMASK"}
SYSCALL_ARG_DICT.update({
"getrlimit": {"resource": RLIMIT_RESOURCE},
"setrlimit": {"resource": RLIMIT_RESOURCE},
"sigprocmask": {"how": SIGPROCMASK_HOW},
"rt_sigprocmask": {"how": SIGPROCMASK_HOW},
})
def main(argv=sys.argv[1:]):
filter_scopes = sorted(SYSCALL_FILTERS.keys())
# Insert positional argument separator, if not already present
if "--" not in argv:
for i, argument in enumerate(argv):
if not argument.startswith("-"):
argv.insert(i, "--")
break
arg_parser = ArgumentParser(
prog="maybe",
usage="%(prog)s [options] command [argument ...]",
description="Run a command without the ability to make changes to your system " +
"and list the changes it would have made.",
epilog="For more information, to report issues or to contribute, " +
"visit https://github.com/p-e-w/maybe.",
)
arg_parser.add_argument("command", nargs="+", help="the command to run under maybe's control")
arg_group = arg_parser.add_mutually_exclusive_group()
arg_group.add_argument("-a", "--allow", nargs="+", choices=filter_scopes, metavar="OPERATION",
help="allow the command to perform the specified operation(s). " +
"all other operations will be denied. " +
"possible values for %(metavar)s are: %(choices)s")
arg_group.add_argument("-d", "--deny", nargs="+", choices=filter_scopes, metavar="OPERATION",
help="deny the command the specified operation(s). " +
"all other operations will be allowed. " +
"see --allow for a list of possible values for %(metavar)s. " +
"--allow and --deny cannot be combined")
arg_parser.add_argument("-l", "--list-only", action="store_true",
help="list operations without header, indentation and rerun prompt")
arg_parser.add_argument("--style-output", choices=["yes", "no", "auto"], default="auto",
help="colorize output using ANSI escape sequences (yes/no) " +
"or automatically decide based on whether stdout is a terminal (auto, default)")
arg_parser.add_argument("-v", "--verbose", action="count",
help="if specified once, print every filtered syscall. " +
"if specified twice, print every syscall, highlighting filtered syscalls")
arg_parser.add_argument("--version", action="version", version="%(prog)s 0.4.0")
args = arg_parser.parse_args(argv)
initialize_terminal(args.style_output)
if args.allow is not None:
filter_scopes = set(filter_scopes) - set(args.allow)
elif args.deny is not None:
filter_scopes = args.deny
syscall_filters = {}
for filter_scope in filter_scopes:
for syscall_filter in SYSCALL_FILTERS[filter_scope]:
syscall_filters[syscall_filter.syscall] = syscall_filter
# Prevent python-ptrace from decoding arguments to keep raw numerical values
DIRFD_ARGUMENTS.clear()
SYSCALL_ARG_DICT.clear()
ARGUMENT_CALLBACK.clear()
# This is basically "shlex.join"
command = " ".join([(("'%s'" % arg) if (" " in arg) else arg) for arg in args.command])
try:
args.command[0] = locateProgram(args.command[0])
pid = createChild(args.command, False)
except Exception as error:
print(T.red("Error executing %s: %s." % (T.bold(command) + T.red, error)))
return 1
debugger = PtraceDebugger()
debugger.traceExec()
try:
debugger.traceFork()
except DebuggerError:
print(T.yellow("Warning: Running without traceFork support. " +
"Syscalls from subprocesses can not be intercepted."))
process = debugger.addProcess(pid, True)
process.syscall()
try:
operations = get_operations(debugger, syscall_filters, args.verbose)
except Exception as error:
print(T.red("Error tracing process: %s." % error))
return 1
except KeyboardInterrupt:
print(T.yellow("%s terminated by keyboard interrupt." % (T.bold(command) + T.yellow)))
return 2
finally:
# Cut down all processes no matter what happens
# to prevent them from doing any damage
debugger.quit()
if operations:
if not args.list_only:
print("%s has prevented %s from performing %d file system operations:\n" %
(T.bold("maybe"), T.bold(command), len(operations)))
for operation in operations:
print(("" if args.list_only else " ") + operation)
if not args.list_only:
try:
choice = input("\nDo you want to rerun %s and permit these operations? [y/N] " % T.bold(command))
except KeyboardInterrupt:
choice = ""
# Ctrl+C does not print a newline automatically
print("")
if choice.lower() == "y":
subprocess.call(args.command)
else:
print("%s has not detected any file system operations from %s." %
(T.bold("maybe"), T.bold(command)))
