366 lines
16 KiB
Python
366 lines
16 KiB
Python
import re
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import requests
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import base64
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import os
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from .peasLoaded import PEASLoaded
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from .peassRecord import PEASRecord
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from .fileRecord import FileRecord
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from .yamlGlobals import (
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TEMPORARY_LINPEAS_BASE_PATH,
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PEAS_FINDS_MARKUP,
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PEAS_STORAGES_MARKUP,
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PEAS_STORAGES_MARKUP,
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INT_HIDDEN_FILES_MARKUP,
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ROOT_FOLDER,
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STORAGE_TEMPLATE,
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FIND_TEMPLATE,
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FIND_LINE_MARKUP,
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STORAGE_LINE_MARKUP,
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STORAGE_LINE_EXTRA_MARKUP,
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EXTRASECTIONS_MARKUP,
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PEAS_VARIABLES_MARKUP,
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YAML_VARIABLES,
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SUIDVB1_MARKUP,
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SUIDVB2_MARKUP,
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SUDOVB1_MARKUP,
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SUDOVB2_MARKUP,
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CAP_SETUID_MARKUP,
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CAP_SETGID_MARKUP,
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LES_MARKUP,
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LES2_MARKUP,
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REGEXES_LOADED,
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REGEXES_MARKUP
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)
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class LinpeasBuilder:
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def __init__(self, ploaded:PEASLoaded):
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self.ploaded = ploaded
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self.hidden_files = set()
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self.bash_find_f_vars, self.bash_find_d_vars = set(), set()
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self.bash_storages = set()
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self.__get_files_to_search()
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with open(TEMPORARY_LINPEAS_BASE_PATH, 'r') as file:
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self.linpeas_sh = file.read()
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def build(self):
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print("[+] Building variables...")
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variables = self.__generate_variables()
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self.__replace_mark(PEAS_VARIABLES_MARKUP, variables, "")
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print("[+] Building finds...")
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find_calls = self.__generate_finds()
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self.__replace_mark(PEAS_FINDS_MARKUP, find_calls, " ")
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print("[+] Building storages...")
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storage_vars = self.__generate_storages()
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self.__replace_mark(PEAS_STORAGES_MARKUP, storage_vars, " ")
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#Check all the expected STORAGES in linpeas have been created
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for s in re.findall(r'PSTORAGE_[\w]*', self.linpeas_sh):
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assert s in self.bash_storages, f"{s} isn't created"
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#Replace interesting hidden files markup for a list of all the searched hidden files
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self.__replace_mark(INT_HIDDEN_FILES_MARKUP, sorted(self.hidden_files), "|")
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print("[+] Checking duplicates...")
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peass_marks = self.__get_peass_marks()
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for i,mark in enumerate(peass_marks):
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for j in range(i+1,len(peass_marks)):
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assert mark != peass_marks[j], f"Found repeated peass mark: {mark}"
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print("[+] Building autocheck sections...")
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sections = self.__generate_sections()
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for section_name, bash_lines in sections.items():
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mark = "peass{"+section_name+"}"
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if mark in peass_marks:
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self.__replace_mark(mark, list(bash_lines), "")
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else:
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self.__replace_mark(EXTRASECTIONS_MARKUP, [bash_lines, EXTRASECTIONS_MARKUP], "\n\n")
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self.__replace_mark(EXTRASECTIONS_MARKUP, list(""), "") #Delete extra markup
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print("[+] Building regexes searches...")
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section = self.__generate_regexes_search()
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self.__replace_mark(REGEXES_MARKUP, list(section), "")
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print("[+] Building linux exploit suggesters...")
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les_b64, les2_b64 = self.__get_linux_exploit_suggesters()
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assert len(les_b64) > 100
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assert len(les2_b64) > 100
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self.__replace_mark(LES_MARKUP, list(les_b64), "")
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self.__replace_mark(LES2_MARKUP, list(les2_b64), "")
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print("[+] Building GTFOBins lists...")
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suidVB, sudoVB, capsVB = self.__get_gtfobins_lists()
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assert len(suidVB) > 185, f"Len suidVB is {len(suidVB)}"
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assert len(sudoVB) > 250, f"Len sudo is {len(sudoVB)}"
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assert len(capsVB) > 10, f"Len suidVB is {len(capsVB)}"
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self.__replace_mark(SUIDVB1_MARKUP, suidVB[:int(len(suidVB)/2)], "|")
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self.__replace_mark(SUIDVB2_MARKUP, suidVB[int(len(suidVB)/2):], "|")
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self.__replace_mark(SUDOVB1_MARKUP, sudoVB[:int(len(sudoVB)/2)], "|")
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self.__replace_mark(SUDOVB2_MARKUP, sudoVB[int(len(sudoVB)/2):], "|")
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self.__replace_mark(CAP_SETUID_MARKUP, capsVB, "|")
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self.__replace_mark(CAP_SETGID_MARKUP, capsVB, "|")
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print("[+] Final sanity checks...")
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#Check that there arent peass marks left in linpeas
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peass_marks = self.__get_peass_marks()
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assert len(peass_marks) == 0, f"There are peass marks left: {', '.join(peass_marks)}"
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#Check for empty seds
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assert 'sed -${E} "s,,' not in self.linpeas_sh
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def __get_peass_marks(self):
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return re.findall(r'peass\{[\w\-\._ ]*\}', self.linpeas_sh)
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def __generate_variables(self):
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"""Generate the variables from the yaml to set into linpeas bash script"""
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variables_bash = ""
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for var in YAML_VARIABLES:
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variables_bash += f"{var['name']}=\"{var['value']}\"\n"
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return variables_bash
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def __get_files_to_search(self):
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"""Given a PEASLoaded and find the files that need to be searched on each root folder"""
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self.dict_to_search = {"d": {}, "f": {}}
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self.dict_to_search["d"] = {r: set() for r in ROOT_FOLDER}
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self.dict_to_search["f"] = {r: set() for r in ROOT_FOLDER}
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for precord in self.ploaded.peasrecords:
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for frecord in precord.filerecords:
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for folder in frecord.search_in:
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self.dict_to_search[frecord.type][folder].add(frecord.regex)
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if frecord.regex[0] == "." or frecord.regex[:2] == "*.":
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self.hidden_files.add(frecord.regex.replace("*",""))
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def __generate_finds(self) -> list:
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"""Given the regexes to search on each root folder, generate the find command"""
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finds = []
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for type,searches in self.dict_to_search.items():
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for r,regexes in searches.items():
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if regexes:
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find_line = f"{r} "
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if type == "d":
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find_line += "-type d "
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bash_find_var = f"FIND_DIR_{r[1:].replace('.','').upper()}"
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self.bash_find_d_vars.add(bash_find_var)
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else:
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bash_find_var = f"FIND_{r[1:].replace('.','').upper()}"
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self.bash_find_f_vars.add(bash_find_var)
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find_line += '-name \\"' + '\\" -o -name \\"'.join(regexes) + '\\"'
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find_line = FIND_TEMPLATE.replace(FIND_LINE_MARKUP, find_line)
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find_line = f"{bash_find_var}={find_line}"
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finds.append(find_line)
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return finds
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def __generate_storages(self) -> list:
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"""Generate the storages to save the results per entry"""
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storages = []
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all_f_finds = "$" + "\\n$".join(self.bash_find_f_vars)
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all_d_finds = "$" + "\\n$".join(self.bash_find_d_vars)
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all_finds = "$" + "\\n$".join(list(self.bash_find_f_vars) + list(self.bash_find_d_vars))
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for precord in self.ploaded.peasrecords:
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bash_storage_var = f"PSTORAGE_{precord.bash_name}"
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self.bash_storages.add(bash_storage_var)
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#Select the FIND_ variables to search on depending on the type files
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if all(frecord.type == "f" for frecord in precord.filerecords):
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storage_line = STORAGE_TEMPLATE.replace(STORAGE_LINE_MARKUP, all_f_finds)
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elif all(frecord.type == "d" for frecord in precord.filerecords):
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storage_line = STORAGE_TEMPLATE.replace(STORAGE_LINE_MARKUP, all_d_finds)
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else:
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storage_line = STORAGE_TEMPLATE.replace(STORAGE_LINE_MARKUP, all_finds)
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#Grep by filename regex (ended in '$')
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bsp = '\\.' #A 'f' expression cannot contain a backslash, so we generate here the bs need in the line below
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grep_names = f" | grep -E \"{'|'.join([frecord.regex.replace('.',bsp).replace('*', '.*')+'$' for frecord in precord.filerecords])}\""
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#Grep by searched folders
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grep_folders_searched = f" | grep -E \"^{'|^'.join(list(set([d for frecord in precord.filerecords for d in frecord.search_in])))}\"".replace("HOMESEARCH","GREPHOMESEARCH")
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#Grep extra paths. They are accumulative between files of the same PEASRecord
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grep_extra_paths = ""
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if any(True for frecord in precord.filerecords if frecord.check_extra_path):
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grep_extra_paths = f" | grep -E '{'|'.join(list(set([frecord.check_extra_path for frecord in precord.filerecords if frecord.check_extra_path])))}'"
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#Grep to remove paths. They are accumulative between files of the same PEASRecord
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grep_remove_path = ""
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if any(True for frecord in precord.filerecords if frecord.remove_path):
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grep_remove_path = f" | grep -v -E '{'|'.join(list(set([frecord.remove_path for frecord in precord.filerecords if frecord.remove_path])))}'"
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#Construct the final line like: STORAGE_MYSQL=$(echo "$FIND_DIR_ETC\n$FIND_DIR_USR\n$FIND_DIR_VAR\n$FIND_DIR_MNT" | grep -E '^/etc/.*mysql|/usr/var/lib/.*mysql|/var/lib/.*mysql' | grep -v "mysql/mysql")
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storage_line = storage_line.replace(STORAGE_LINE_EXTRA_MARKUP, f"{grep_remove_path}{grep_extra_paths}{grep_folders_searched}{grep_names}")
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storage_line = f"{bash_storage_var}={storage_line}"
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storages.append(storage_line)
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return storages
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def __generate_sections(self) -> dict:
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"""Generate sections for records with auto_check to True"""
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sections = {}
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for precord in self.ploaded.peasrecords:
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if precord.auto_check:
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section = f'if [ "$PSTORAGE_{precord.bash_name}" ] || [ "$DEBUG" ]; then\n'
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section += f' print_2title "Analyzing {precord.name.replace("_"," ")} Files (limit 70)"\n'
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for exec_line in precord.exec:
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if exec_line:
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section += " " + exec_line + "\n"
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for frecord in precord.filerecords:
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section += " " + self.__construct_file_line(precord, frecord) + "\n"
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section += "fi\n"
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sections[precord.name] = section
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return sections
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def __construct_file_line(self, precord: PEASRecord, frecord: FileRecord, init: bool = True) -> str:
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real_regex = frecord.regex[1:] if frecord.regex.startswith("*") and len(frecord.regex) > 1 else frecord.regex
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real_regex = real_regex.replace(".","\\.").replace("*",".*")
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real_regex += "$"
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analise_line = ""
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if init:
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analise_line = 'if ! [ "`echo \\\"$PSTORAGE_'+precord.bash_name+'\\\" | grep -E \\\"'+real_regex+'\\\"`" ]; then if [ "$DEBUG" ]; then echo_not_found "'+frecord.regex+'"; fi; fi; '
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analise_line += 'printf "%s" "$PSTORAGE_'+precord.bash_name+'" | grep -E "'+real_regex+'" | while read f; do ls -ld "$f" | sed -${E} "s,'+real_regex+',${SED_RED},"; '
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#If just list, just list the file/directory
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if frecord.just_list_file:
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if frecord.type == "d":
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analise_line += 'ls -lRA "$f";'
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analise_line += 'done; echo "";'
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return analise_line
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if frecord.type == "f":
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grep_empty_lines = ' | grep -IEv "^$"'
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grep_line_grep = f' | grep -E {frecord.line_grep}' if frecord.line_grep else ""
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grep_only_bad_lines = f' | grep -E "{frecord.bad_regex}"' if frecord.bad_regex else ""
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grep_remove_regex = f' | grep -Ev "{frecord.remove_regex}"' if frecord.remove_regex else ""
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sed_bad_regex = ' | sed -${E} "s,'+frecord.bad_regex+',${SED_RED},g"' if frecord.bad_regex else ""
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sed_very_bad_regex = ' | sed -${E} "s,'+frecord.very_bad_regex+',${SED_RED_YELLOW},g"' if frecord.very_bad_regex else ""
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sed_good_regex = ' | sed -${E} "s,'+frecord.good_regex+',${SED_GOOD},g"' if frecord.good_regex else ""
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if init:
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analise_line += 'cat "$f" 2>/dev/null'
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else:
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analise_line += 'cat "$ff" 2>/dev/null'
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if grep_empty_lines:
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analise_line += grep_empty_lines
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if grep_line_grep:
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analise_line += grep_line_grep
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if frecord.only_bad_lines and not grep_line_grep:
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analise_line += grep_only_bad_lines
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if grep_remove_regex:
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analise_line += grep_remove_regex
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if sed_bad_regex:
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analise_line += sed_bad_regex
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if sed_very_bad_regex:
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analise_line += sed_very_bad_regex
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if sed_good_regex:
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analise_line += sed_good_regex
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analise_line += '; done; echo "";'
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return analise_line
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#In case file is type "d"
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if frecord.files:
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for ffrecord in frecord.files:
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ff_real_regex = ffrecord.regex[1:] if ffrecord.regex.startswith("*") and ffrecord.regex != "*" else ffrecord.regex
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ff_real_regex = ff_real_regex.replace("*",".*")
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#analise_line += 'for ff in $(find "$f" -name "'+ffrecord.regex+'"); do ls -ld "$ff" | sed -${E} "s,'+ff_real_regex+',${SED_RED},"; ' + self.__construct_file_line(precord, ffrecord, init=False)
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analise_line += 'find "$f" -name "'+ffrecord.regex+'" | while read ff; do ls -ld "$ff" | sed -${E} "s,'+ff_real_regex+',${SED_RED},"; ' + self.__construct_file_line(precord, ffrecord, init=False)
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analise_line += 'done; echo "";'
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return analise_line
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def __get_linux_exploit_suggesters(self) -> tuple:
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r1 = requests.get("https://raw.githubusercontent.com/mzet-/linux-exploit-suggester/master/linux-exploit-suggester.sh")
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r2 = requests.get("https://raw.githubusercontent.com/jondonas/linux-exploit-suggester-2/master/linux-exploit-suggester-2.pl")
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return(base64.b64encode(bytes(r1.text, 'utf-8')).decode("utf-8"), base64.b64encode(bytes(r2.text, 'utf-8')).decode("utf-8"))
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def __get_gtfobins_lists(self) -> tuple:
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r = requests.get("https://github.com/GTFOBins/GTFOBins.github.io/tree/master/_gtfobins")
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bins = re.findall(r'/GTFOBins/GTFOBins.github.io/blob/master/_gtfobins/([\w_ \-]+).md', r.text)
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sudoVB = []
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suidVB = []
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capsVB = []
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for b in bins:
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rb = requests.get(f"https://raw.githubusercontent.com/GTFOBins/GTFOBins.github.io/master/_gtfobins/{b}.md")
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if "sudo:" in rb.text:
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sudoVB.append(b+"$")
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if "suid:" in rb.text:
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suidVB.append("/"+b+"$")
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if "capabilities:" in rb.text:
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capsVB.append(b)
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return (suidVB, sudoVB, capsVB)
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def __generate_regexes_search(self) -> str:
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paths_to_search = REGEXES_LOADED["paths"]
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regexes = REGEXES_LOADED["regular_expresions"]
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regexes_search_section = ""
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for values in regexes:
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section_name = values["name"]
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regexes_search_section += f'print_2title "Searching {section_name}"\n'
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for entry in values["regexes"]:
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name = entry["name"]
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regex = entry["regex"]
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regex = regex.replace('"', '\\"').strip()
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extra_grep = entry.get("extra_grep")
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extra_grep = f"| grep {extra_grep}" if extra_grep else ""
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regexes_search_section += f'print_3title "Searching {name} (limited to 50)"\n'
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for path in paths_to_search:
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regexes_search_section += "timeout 120 find "+path+" -type f -exec grep -HnRiIE \""+regex+"\" '{}' \; 2>/dev/null "+extra_grep+" | sed '/^.\{150\}./d' | sort | uniq | head -n 50 | sed -${E} \"s~"+regex+"~${SED_RED}~\" &\n"
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regexes_search_section += "wait\n"
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regexes_search_section += "echo ''\n"
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return regexes_search_section
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def __replace_mark(self, mark: str, find_calls: list, join_char: str):
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"""Substitude the markup with the actual code"""
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self.linpeas_sh = self.linpeas_sh.replace(mark, join_char.join(find_calls)) #New line char is't needed
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def write_linpeas(self, path):
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"""Write on disk the final linpeas"""
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with open(path, "w") as f:
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f.write(self.linpeas_sh)
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os.remove(TEMPORARY_LINPEAS_BASE_PATH) #Remove the built linpeas_base.sh file |