Class: Homebrew::Vulns::Vulnerability Private

Inherits:
Object
  • Object
show all
Includes:
Utils::Output::Mixin
Defined in:
vulns/vulnerability.rb

Overview

This class is part of a private API. This class may only be used in the Homebrew/brew repository. Third parties should avoid using this class if possible, as it may be removed or changed without warning.

Wraps a single OSV vulnerability record. See https://ossf.github.io/osv-schema/ for the field definitions.

Defined Under Namespace

Classes: Interval, RangeStatus, Uncomparable

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Utils::Output::Mixin

#issue_reporting_message, #odebug, #odeprecated, #odie, #odisabled, #ofail, #oh1, #oh1_title, #ohai, #ohai_title, #onoe, #opoo, #opoo_outside_github_actions, #opoo_without_github_actions_annotation, #pretty_cannot_install, #pretty_deprecated, #pretty_disabled, #pretty_duration, #pretty_install_status, #pretty_installed, #pretty_uninstalled, #pretty_unmarked, #pretty_upgradable, #pretty_warning

Constructor Details

#initialize(data) ⇒ void

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:



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# File 'vulns/vulnerability.rb', line 54

def initialize(data)
  @id = T.let(data.fetch("id"), String)
  @summary = T.let(data["summary"], T.nilable(String))
  @details = T.let(data["details"], T.nilable(String))
  @aliases = T.let(Array(data["aliases"]), T::Array[String])
  @upstream = T.let(Array(data["upstream"]), T::Array[String])
  @related = T.let(Array(data["related"]), T::Array[String])
  @references = T.let(Array(data["references"]), T::Array[T::Hash[String, T.untyped]])
  @affected = T.let(Array(data["affected"]), T::Array[T::Hash[String, T.untyped]])
  @severity_entries = T.let(Array(data["severity"]), T::Array[T::Hash[String, T.untyped]])
  @severity = T.let(extract_severity(data), T.nilable(Symbol))
end

Instance Attribute Details

#affected ⇒ Array<Hash{String => T.untyped}> (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:



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# File 'vulns/vulnerability.rb', line 51

def affected
  @affected
end

#aliases ⇒ Array<String> (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:



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# File 'vulns/vulnerability.rb', line 48

def aliases
  @aliases
end

#details ⇒ String? (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:



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# File 'vulns/vulnerability.rb', line 42

def details
  @details
end

#id ⇒ String (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:



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# File 'vulns/vulnerability.rb', line 39

def id
  @id
end

#references ⇒ Array<Hash{String => T.untyped}> (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:



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# File 'vulns/vulnerability.rb', line 51

def references
  @references
end

#related ⇒ Array<String> (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:



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# File 'vulns/vulnerability.rb', line 48

def related
  @related
end

#severity ⇒ Symbol? (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:



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# File 'vulns/vulnerability.rb', line 45

def severity
  @severity
end

#severity_entries ⇒ Array<Hash{String => T.untyped}> (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:



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# File 'vulns/vulnerability.rb', line 51

def severity_entries
  @severity_entries
end

#summary ⇒ String? (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:



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# File 'vulns/vulnerability.rb', line 42

def summary
  @summary
end

#upstream ⇒ Array<String> (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:



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# File 'vulns/vulnerability.rb', line 48

def upstream
  @upstream
end

Class Method Details

.from_osv_list(list) ⇒ Array<Vulnerability>

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

Returns:



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# File 'vulns/vulnerability.rb', line 68

def self.from_osv_list(list)
  list.map { |data| new(data) }
end

Instance Method Details

#advisory_url ⇒ String?

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:



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# File 'vulns/vulnerability.rb', line 101

def advisory_url
  references.find { |r| r["type"] == "ADVISORY" }&.dig("url")
end

#affected_entries_for(ecosystem, name) ⇒ Array<Hash{String => T.untyped}>

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

Returns:



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# File 'vulns/vulnerability.rb', line 220

def affected_entries_for(ecosystem, name)
  affected.select do |aff|
    pkg = aff["package"]
    pkg.is_a?(Hash) && pkg["ecosystem"] == ecosystem && pkg["name"] == name
  end
end

#affected_entry_relevant?(aff, repo_url) ⇒ Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

Returns:

  • (Boolean) 


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# File 'vulns/vulnerability.rb', line 430

def affected_entry_relevant?(aff, repo_url)
  return true if repo_url.nil?

  git_ranges = Array(aff["ranges"]).select { |r| r["type"] == "GIT" }
  if git_ranges.any?
    normalized_repo = repo_url.downcase.chomp("/").delete_suffix(".git").chomp("/")
    return git_ranges.any? do |r|
      range_repo = r["repo"].to_s.downcase.chomp("/").delete_suffix(".git").chomp("/")
      range_repo.empty? || range_repo == normalized_repo
    end
  end

  # For entries without GIT ranges (e.g. SEMVER ranges or version lists),
  # check that the package ecosystem is GIT or unspecified.
  ecosystem = aff.dig("package", "ecosystem")
  ecosystem.blank? || ecosystem == "GIT"
end

#affects_version?(version) ⇒ Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

OSV has already matched this record against the queried version. This method only overrides that with false when every affected entry can be evaluated locally (explicit versions list or SEMVER range) and none of them contains the target. Any uncheckable range or comparison failure keeps the match.

Parameters:

Returns:

  • (Boolean) 


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# File 'vulns/vulnerability.rb', line 259

def affects_version?(version)
  return true if affected.empty?

  target = normalize_version(version)
  checkable = T.let(false, T::Boolean)

  affected.each do |aff|
    versions = Array(aff["versions"])
    if versions.any?
      checkable = true
      return true if versions.any? { |v| normalize_version(v.to_s) == target }
    end

    Array(aff["ranges"]).each do |range|
      return true if range["type"] != "SEMVER"

      checkable = true
      return true if in_semver_range?(target, Array(range["events"]))
    end
  end

  !checkable
end

#comparator_for(range_type) ⇒ T.proc.params(a: String, b: String).returns(Integer)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

Returns:



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# File 'vulns/vulnerability.rb', line 228

def comparator_for(range_type)
  if range_type == "SEMVER"
    ->(a, b) { Semver.compare(a, b) || raise(Uncomparable) }
  else
    ->(a, b) { Version.new(a) <=> Version.new(b) || raise(Uncomparable) }
  end
end

#cve_ids ⇒ Array<String>

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:



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# File 'vulns/vulnerability.rb', line 96

def cve_ids
  identifiers.select { |i| i.start_with?("CVE-") }
end

#extract_severity(data) ⇒ Symbol?

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

Returns:



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# File 'vulns/vulnerability.rb', line 284

def extract_severity(data)
  Array(data["severity"])
    .select { |s| CVSS_TYPE_PRIORITY.key?(s["type"]) }
    .sort_by { |s| -CVSS_TYPE_PRIORITY.fetch(s["type"]) }
    .each do |s|
      sev = CVSS.severity(s["score"].to_s)
      return sev if sev
    end

  top = normalize_severity(data.dig("database_specific", "severity"))
  return top if top

  affected.each do |aff|
    eco = normalize_severity(aff.dig("ecosystem_specific", "severity"))
    return eco if eco

    db = normalize_severity(aff.dig("database_specific", "severity"))
    return db if db
  end

  nil
end

#fix_available?(version, repo_url = nil) ⇒ Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

  • version (String)
  • repo_url (String, nil) (defaults to: nil)

Returns:

  • (Boolean) 


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# File 'vulns/vulnerability.rb', line 449

def fix_available?(version, repo_url = nil)
  fix_available_of_type?(version, repo_url, :any)
end

#fix_available_of_type?(version, repo_url, fix_type) ⇒ Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

Returns:

  • (Boolean) 


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# File 'vulns/vulnerability.rb', line 464

def fix_available_of_type?(version, repo_url, fix_type)
  return false if affected.empty?

  target = normalize_version(version)

  affected.each do |aff|
    next unless affected_entry_relevant?(aff, repo_url)

    version_matched = false
    ranges = Array(aff["ranges"])
    semver_ranges, non_semver_ranges = ranges.partition { |r| r["type"] == "SEMVER" }

    versions = Array(aff["versions"])
    version_matched = true if versions.any? { |v| normalize_version(v.to_s) == target }

    version_matched = true if non_semver_ranges.any?

    matched_semver_range = T.let(false, T::Boolean)
    fix_found = T.let(false, T::Boolean)

    semver_ranges.each do |range|
      intervals(Array(range["events"])).each do |interval|
        result = in_interval_strict?(target, interval)
        next if result.nil?

        next unless result

        matched_semver_range = true
        fix = interval.fix
        next if fix.blank?

        fix_found = true if fix_type != :patch
      end
    end

    version_matched ||= matched_semver_range

    next unless version_matched

    return true if fix_found

    non_semver_ranges.each do |range|
      return true if non_semver_fix_available_of_type?(target, range, fix_type)
    end
  end

  false
end

#fix_urls ⇒ Array<String>

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:



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# File 'vulns/vulnerability.rb', line 106

def fix_urls
  references.select { |r| r["type"] == "FIX" }.filter_map { |r| r["url"] }
end

#fixed_versions ⇒ Array<String>

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:



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# File 'vulns/vulnerability.rb', line 111

def fixed_versions
  affected.flat_map do |aff|
    Array(aff["ranges"]).flat_map do |range|
      Array(range["events"]).filter_map { |e| e["fixed"] }
    end
  end.uniq
end

#identifiers ⇒ Array<String>

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Only id and aliases name this vulnerability. upstream is a directed reference (a distro advisory pointing at one-or-more source CVEs) and related links to different vulnerabilities; neither is safe to treat as an identity of this record. Match follows upstream explicitly and re-attributes the hit to each CVE it names.

Returns:



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# File 'vulns/vulnerability.rb', line 91

def identifiers
  [id, *aliases].uniq
end

#in_interval?(target, lower, upper, upper_inclusive, cmp) ⇒ Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

Returns:

  • (Boolean) 


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# File 'vulns/vulnerability.rb', line 241

def in_interval?(target, lower, upper, upper_inclusive, cmp)
  above = lower.nil? || cmp.call(target, lower) >= 0
  below = if upper.nil?
    true
  elsif upper_inclusive
    cmp.call(target, upper) <= 0
  else
    cmp.call(target, upper).negative?
  end
  above && below
end

#in_interval_permissive?(target, interval) ⇒ Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

Returns:

  • (Boolean) 


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# File 'vulns/vulnerability.rb', line 350

def in_interval_permissive?(target, interval)
  in_interval_strict?(target, interval) != false
rescue => e
  odebug "Failed to check #{target} against interval #{interval.inspect} for #{id}: #{e}"
  true
end

#in_interval_strict?(target, interval) ⇒ Boolean?

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

Returns:

  • (Boolean, nil) 


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# File 'vulns/vulnerability.rb', line 333

def in_interval_strict?(target, interval)
  lower = interval.lower
  upper = interval.upper
  above = lower.nil? || semver_compare!(target, lower) >= 0
  below = if upper.nil?
    true
  elsif interval.upper_inclusive
    semver_compare!(target, upper) <= 0
  else
    semver_compare!(target, upper).negative?
  end
  above && below
rescue Uncomparable
  nil
end

#in_semver_range?(target, events) ⇒ Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

Returns:

  • (Boolean) 


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# File 'vulns/vulnerability.rb', line 326

def in_semver_range?(target, events)
  return false if events.empty?

  intervals(events).any? { |interval| in_interval_permissive?(target, interval) }
end

#intervals(events) ⇒ Array<Interval>

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

Returns:



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# File 'vulns/vulnerability.rb', line 366

def intervals(events)
  result = []
  lower = T.let(nil, T.nilable(String))

  events.each do |event|
    if (intro = event["introduced"])
      result << Interval.new(lower: lower, upper: nil, upper_inclusive: false, fix: nil) if lower
      intro = normalize_version(intro.to_s)
      lower = (intro == "0") ? nil : intro
    elsif (fixed = event["fixed"])
      fixed_norm = normalize_version(fixed.to_s)
      result << Interval.new(lower: lower, upper: fixed_norm, upper_inclusive: false, fix: fixed_norm)
      lower = nil
    elsif (last = event["last_affected"])
      last_norm = normalize_version(last.to_s)
      result << Interval.new(lower: lower, upper: last_norm, upper_inclusive: true, fix: nil)
      lower = nil
    elsif (limit = event["limit"])
      limit = limit.to_s
      upper = (limit == "*") ? nil : normalize_version(limit)
      result << Interval.new(lower: lower, upper: upper, upper_inclusive: false, fix: nil)
      lower = nil
    end
  end
  result << Interval.new(lower: lower, upper: nil, upper_inclusive: false, fix: nil) if lower || result.empty?
  result
end

#non_semver_fix_available_of_type?(target, range, fix_type) ⇒ Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

Returns:

  • (Boolean) 


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# File 'vulns/vulnerability.rb', line 395

def non_semver_fix_available_of_type?(target, range, fix_type)
  events = Array(range["events"])
  return false if events.empty?

  is_git = range["type"] == "GIT"
  range_intervals = intervals(events)
  uncomparable_seen = T.let(false, T::Boolean)
  range_intervals.each do |interval|
    result = in_interval_strict?(target, interval)
    if result.nil?
      uncomparable_seen = true
      next
    end

    next unless result

    fix = interval.fix
    return false if fix.blank?

    return (fix_type == :patch && is_git) || (fix_type == :released && !is_git) || fix_type == :any
  end

  return false unless uncomparable_seen

  last_event = events.last
  return false if last_event.nil?
  return false unless last_event.key?("fixed")

  fix = last_event["fixed"].to_s
  return false if fix.blank?

  (fix_type == :patch && is_git) || (fix_type == :released && !is_git) || fix_type == :any
end

#normalize_severity(value) ⇒ Symbol?

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

Returns:



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# File 'vulns/vulnerability.rb', line 308

def normalize_severity(value)
  case value&.downcase
  when "critical" then :critical
  when "high" then :high
  when "medium", "moderate" then :medium
  when "low" then :low
  end
end

#normalize_version(version) ⇒ String

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

Returns:



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# File 'vulns/vulnerability.rb', line 318

def normalize_version(version)
  version.sub(/\Av/i, "")
end

#patch_fix_available?(version, repo_url = nil) ⇒ Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

  • version (String)
  • repo_url (String, nil) (defaults to: nil)

Returns:

  • (Boolean) 


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# File 'vulns/vulnerability.rb', line 459

def patch_fix_available?(version, repo_url = nil)
  fix_available_of_type?(version, repo_url, :patch)
end

#range_status(ecosystem, name, version) ⇒ RangeStatus?

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Evaluates version against every affected[] entry whose package matches {ecosystem, name} (an advisory can carry several disjoint entries for the same package, e.g. GHSA-jfh8-c2jp-5v3q's three log4j-core ranges), honouring range type:

  • SEMVER ranges compare with Semver.
  • ECOSYSTEM ranges compare with Version (best-effort; the record's own ecosystem defines the ordering, but callers only invoke this for ecosystems whose versions are broadly Version-comparable).
  • GIT ranges are commit hashes and are skipped as uncomparable.

Returns nil when no entry matches the package or no comparable range exists in the matching entries, so callers can distinguish :not_applicable/:fixed from "could not check".

Parameters:

Returns:



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# File 'vulns/vulnerability.rb', line 149

def range_status(ecosystem, name, version)
  entries = affected_entries_for(ecosystem, name)
  return if entries.empty?

  target = normalize_version(version)
  checked = T.let(false, T::Boolean)
  past_terminals = T.let([], T::Array[[String, T.nilable(String), Comparator]])

  entries.each do |entry|
    Array(entry["ranges"]).each do |range|
      type = range["type"]
      next if type == "GIT"

      cmp = comparator_for(type)
      intervals(Array(range["events"])).each do |interval|
        inside = in_interval?(target, interval.lower, interval.upper, interval.upper_inclusive, cmp)
        checked = true
        if inside
          return RangeStatus.new(state: :affected, fixed_in: interval.fix).freeze
        end

        upper = interval.upper
        next unless upper

        rel = cmp.call(target, upper)
        past = interval.upper_inclusive ? rel.positive? : rel >= 0
        past_terminals << [upper, interval.fix, cmp] if past
      rescue Uncomparable
        next
      end
    end

    versions = Array(entry["versions"])
    next if versions.empty?

    checked = true
    if versions.any? { |v| normalize_version(v.to_s) == target }
      return RangeStatus.new(state: :affected, fixed_in: nil).freeze
    end
  end

  return unless checked

  # Conflicting entries can end at the same version with `fixed` and
  # `last_affected`/`limit`. Prefer the non-fix terminal on a tie so
  # upstream entry ordering cannot turn an inclusive affected boundary
  # into a reported fix version. `Version` ranks terminals across ranges
  # of differing types, but each range's own comparator also settles
  # ties: SemVer ignores build metadata, so `1.0.0+1` and `1.0.0+2` are
  # one boundary there and `Version` alone would miss the tie.
  latest_terminal = past_terminals.max_by do |upper, fix, _|
    [Version.new(upper), fix.nil? ? 1 : 0]
  end
  return RangeStatus.new(state: :not_applicable, fixed_in: nil).freeze unless latest_terminal

  boundary, fixed_in, cmp = latest_terminal
  shadowed = past_terminals.any? do |other, other_fix, other_cmp|
    other_fix.nil? &&
      (same_boundary?(boundary, other, cmp) || same_boundary?(boundary, other, other_cmp))
  end
  RangeStatus.new(state: :fixed, fixed_in: (fixed_in unless shadowed)).freeze
end

#released_fix_available?(version, repo_url = nil) ⇒ Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

  • version (String)
  • repo_url (String, nil) (defaults to: nil)

Returns:

  • (Boolean) 


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# File 'vulns/vulnerability.rb', line 454

def released_fix_available?(version, repo_url = nil)
  fix_available_of_type?(version, repo_url, :released)
end

#same_boundary?(left, right, cmp) ⇒ Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

Returns:

  • (Boolean) 


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# File 'vulns/vulnerability.rb', line 213

def same_boundary?(left, right, cmp)
  cmp.call(left, right).zero?
rescue Uncomparable
  false
end

#semver_compare!(left, right) ⇒ Integer

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

Returns:



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# File 'vulns/vulnerability.rb', line 358

def semver_compare!(left, right)
  Semver.compare(left, right) || raise(Uncomparable, "cannot compare #{left.inspect} with #{right.inspect}")
end

#severity_display ⇒ String

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:



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# File 'vulns/vulnerability.rb', line 73

def severity_display
  severity&.to_s&.upcase || "UNKNOWN"
end

#severity_level ⇒ Integer

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:



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# File 'vulns/vulnerability.rb', line 78

def severity_level
  sev = severity
  return 0 if sev.nil?

  SEVERITY_LEVEL.fetch(sev, 0)
end