zulip/tools/semgrep.yml

# See https://github.com/returntocorp/semgrep/blob/experimental/docs/config/advanced.md

rules:
####################### PYTHON RULES #######################
  - id: deprecated-render-usage
    pattern: django.shortcuts.render_to_response(...)
    message: "Use render() (from django.shortcuts) instead of render_to_response()"
    languages: [python]
    severity: ERROR

  - id: useless-if-body
    patterns:
      - pattern: |
          if $X:
              $S
          else:
              $S
    message: "Useless if statment; both blocks have the same body"
    languages: [python]
    severity: ERROR

  - id: dont-use-stream-objects-filter
    pattern: Stream.objects.filter(...)
    message: "Please use access_stream_by_*() to fetch Stream objects"
    languages: [python]
    severity: ERROR
    paths:
      include:
        - zerver/views/

  - id: dont-import-models-in-migrations
    patterns:
      - pattern-not: from zerver.lib.redis_utils import get_redis_client
      - pattern-not: from zerver.lib.utils import generate_random_token
      - pattern-not: from zerver.models import filter_pattern_validator
      - pattern-not: from zerver.models import filter_format_validator
      - pattern-not: from zerver.models import generate_email_token_for_stream
      - pattern-either:
          - pattern: from zerver import $X
          - pattern: from analytics import $X
          - pattern: from confirmation import $X
    message: "Don't import models or other code in migrations; see docs/subsystems/schema-migrations.md"
    languages: [python]
    severity: ERROR
    paths:
      include:
        - "**/migrations"
      exclude:
        - zerver/migrations/0032_verify_all_medium_avatar_images.py
        - zerver/migrations/0104_fix_unreads.py
        - zerver/migrations/0206_stream_rendered_description.py
        - zerver/migrations/0209_user_profile_no_empty_password.py
        - zerver/migrations/0260_missed_message_addresses_from_redis_to_db.py
        - pgroonga/migrations/0002_html_escape_subject.py

  - id: logging-format
    languages: [python]
    patterns:
      - pattern-either:
          - pattern: logging.$Y(... % ...)
          - pattern: logging.$Y(... .format(...))
          - pattern: logging.$Y(f"...")
          - pattern: logger.$Y(... % ...)
          - pattern: logger.$Y(... .format(...))
          - pattern: logger.$Y(f"...")
      - pattern-where-python: "vars['$Y'] in ['debug', 'info', 'warning', 'error', 'critical', 'exception']"
    severity: ERROR
    message: "Pass format arguments to logging (https://docs.python.org/3/howto/logging.html#optimization)"

  - id: sql-format
    languages: [python]
    pattern-either:
      - pattern: ... .execute(... % ...)
      - pattern: ... .execute("...".format(...))
      - pattern: psycopg2.sql.SQL(... % ...)
      - pattern: psycopg2.sql.SQL(... .format(...))
      - pattern: django.db.migrations.RunSQL(..., ... % ..., ...)
      - pattern: django.db.migrations.RunSQL(..., "..." .format(...), ...)
      - pattern: django.db.migrations.RunSQL(..., [..., ... % ..., ...], ...)
      - pattern: django.db.migrations.RunSQL(..., [..., "..." .format(...), ...], ...)
    severity: ERROR
    message: "Do not write a SQL injection vulnerability please"

  - id: translated-format
    languages: [python]
    pattern-either:
      - pattern: django.utils.translation.ugettext(... .format(...))
      - pattern: django.utils.translation.ugettext(f"...")
    severity: ERROR
    message: "Format strings after translation, not before"

  - id: mutable-default-type
    languages: [python]
    pattern-either:
      - pattern: |
          def $F(..., $A: typing.List[...] = [...], ...) -> ...:
              ...
      - pattern: |
          def $F(..., $A: typing.Optional[typing.List[...]] = [...], ...) -> ...:
              ...
      - pattern: |
          def $F(..., $A: typing.List[...] = zerver.lib.request.REQ(..., default=[...], ...), ...) -> ...:
              ...
      - pattern: |
          def $F(..., $A: typing.Optional[typing.List[...]] = zerver.lib.request.REQ(..., default=[...], ...), ...) -> ...:
              ...
      - pattern: |
          def $F(..., $A: typing.Dict[...] = {}, ...) -> ...:
              ...
      - pattern: |
          def $F(..., $A: typing.Optional[typing.Dict[...]] = {}, ...) -> ...:
              ...
      - pattern: |
          def $F(..., $A: typing.Dict[...] = zerver.lib.request.REQ(..., default={}, ...), ...) -> ...:
              ...
      - pattern: |
          def $F(..., $A: typing.Optional[typing.Dict[...]] = zerver.lib.request.REQ(..., default={}, ...), ...) -> ...:
              ...
      - pattern: |
          def $F(..., $A: typing.Set[...] = set(), ...) -> ...:
              ...
      - pattern: |
          def $F(..., $A: typing.Optional[typing.Set[...]] = set(), ...) -> ...:
              ...
    severity: ERROR
    message: "Guard mutable default with read-only type (Sequence, Mapping, AbstractSet)"

  - id: percent-formatting
    languages: [python]
    pattern-either:
      - pattern: '"..." % ...'
      - pattern: '("...") % ...'
      - pattern: django.utils.translation.ugettext(...) % ...
    severity: ERROR
    message: "Prefer f-strings or .format for string formatting"