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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| import contextlib | ||
| import json | ||
|
|
||
| from credsweeper.common.constants import Chars | ||
| from credsweeper.config import Config | ||
| from credsweeper.credentials import LineData | ||
| from credsweeper.file_handler.analysis_target import AnalysisTarget | ||
| from credsweeper.filters import Filter | ||
| from credsweeper.filters.value_entropy_base64_check import ValueEntropyBase64Check | ||
| from credsweeper.utils import Util | ||
|
|
||
|
|
||
| class ValueAzureTokenCheck(Filter): | ||
| """ | ||
| Azure tokens contains header, payload and signature | ||
| https://learn.microsoft.com/en-us/azure/active-directory-b2c/access-tokens | ||
| """ | ||
|
|
||
| def __init__(self, config: Config = None) -> None: | ||
| pass | ||
|
|
||
| def run(self, line_data: LineData, target: AnalysisTarget) -> bool: | ||
| """Run filter checks on received token which might be structured. | ||
| Args: | ||
| line_data: credential candidate data | ||
| target: multiline target from which line data was obtained | ||
| Return: | ||
| True, when need to filter candidate and False if left | ||
| """ | ||
| with contextlib.suppress(Exception): | ||
| parts = line_data.value.split('.') | ||
| if 3 != len(parts): | ||
| return True | ||
| hdr = Util.decode_base64(parts[0], padding_safe=True, urlsafe_detect=True) | ||
| header = json.loads(hdr) | ||
| if not ("alg" in header and "typ" in header and "kid" in header): | ||
| # must be all parts in header | ||
| return True | ||
| pld = Util.decode_base64(parts[1], padding_safe=True, urlsafe_detect=True) | ||
| payload = json.loads(pld) | ||
| if not ("iss" in payload and "exp" in payload and "iat" in payload): | ||
| # must be all parts in payload | ||
| return True | ||
| min_entropy = ValueEntropyBase64Check.get_min_data_entropy(len(parts[2])) | ||
| entropy = Util.get_shannon_entropy(parts[2], Chars.BASE64URL_CHARS.value) | ||
| # good signature has to be like random bytes | ||
| return entropy < min_entropy | ||
|
|
||
| return True |
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