Module: PWN::AI::Agent::ToolGuard

Defined in:
lib/pwn/ai/agent/tool_guard.rb

Overview

Shared pre-dispatch guards for the two high-volume runtime tools (shell / pwn_eval). Rejects placeholder payloads, aliases wrong schema keys, and names the shell that will actually run the command.

Constant Summary collapse

ALIASES = 
{
  'command' => %w[value cmd input],
  'code' => %w[value source ruby input],
  'query' => %w[value q text]
}.freeze
PLACEHOLDER_RX =

Token-level junk the model keeps emitting instead of a real command.

/
  \A\s*(?:\.{3}|…|\{\s*\.{3}\s*\}|\{\s*…\s*\}|<\.{3}>)\s*\z
  |\{\s*(?:\.{3}|…)\s*\}
/x
BASHISM_RX =

Conservative bash-only constructs. POSIX $(()) is allowed.

/
  \bPIPESTATUS\b
  |\$\{?RANDOM\}?\b
  |\[\[(?:\s|\z)
  |(?:^|[\s;|&])source\s+\S
  |<\([^)]
  |&>
/x
CORE_CONSTS =

RestClient uses HTTP::CookieJar. pwn_eval in TOPLEVEL_BINDING can assign HTTP = "/path/http" or Digest = "(self.we" and then every provider hop / payload_sig TypeErrors.

i[HTTP Digest JSON URI Timeout].freeze
RUNTIMES_FILE = 
File.join(Dir.home, '.pwn', 'metrics', 'runtimes.json')
MAX_PAYLOAD_BYTES = 
1_048_576
TIMEOUT_STEP_S = 
180
TIMEOUT_MAX_S = 
10_800
MUTATION_MAX = 
10

Class Method Summary collapse

Class Method Details

.authors ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 608

public_class_method def self.authors
  "AUTHOR(S):\n  0day Inc. <[email protected]>\n"
end

.auto_job?(opts = {}) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pwn/ai/agent/tool_guard.rb', line 595

public_class_method def self.auto_job?(opts = {})
  pred = opts[:predicted] || predicted_timeout(command_class: opts[:command_class] || command_class(payload: opts[:payload].to_s))
  pred.to_i > 120
end

.bashism?(opts = {}) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pwn/ai/agent/tool_guard.rb', line 72

public_class_method def self.bashism?(opts = {})
  surface = shell_syntax_surface(text: opts[:text])
  return false if surface.to_s.empty?

  surface = surface.gsub(/\$\{?RANDOM\}?\b/, '') if surface.match?(/\bRANDOM=/)
  BASHISM_RX.match?(surface)
rescue StandardError
  false
end

.canary_leak?(opts = {}) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pwn/ai/agent/tool_guard.rb', line 102

public_class_method def self.canary_leak?(opts = {})
  text = opts[:text].to_s
  toks = Array(Thread.current[:pwn_canary_hist])
  toks << Thread.current[:pwn_canary].to_s
  toks = toks.reject(&:empty?).uniq
  return false if toks.empty?

  require 'base64'
  toks.any? do |tok|
    next true if text.include?(tok)

    b64 = Base64.strict_encode64(tok)
    b64u = Base64.urlsafe_encode64(tok)
    hex = tok.each_byte.map { |b| format('%02x', b) }.join
    enc = URI.encode_www_form_component(tok)
    rot = tok.tr('A-Za-z', 'N-ZA-Mn-za-m')
    text.include?(b64) || text.include?(b64u) || text.include?(hex) || text.include?(enc) || text.include?(rot)
  end
end

.coerce_args(opts = {}) ⇒ Object

Coerce common wrong keys onto the first required schema field. Returns the args hash; sets :__schema_error when still missing.



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 186

public_class_method def self.coerce_args(opts = {})
  args = (opts[:args] || {}).dup
  args = args.each_with_object({}) { |(k, v), m| m[k.to_sym] = v } unless args.empty?
  req = Array(opts[:required]).map(&:to_s)
  req.each do |key|
    next if present?(value: args[key.to_sym])

    hit = Array(ALIASES[key]).find { |a| present?(value: args[a.to_sym]) }
    args[key.to_sym] = args[hit.to_sym] if hit
  end
  missing = req.reject { |k| present?(value: args[k.to_sym]) }
  unless missing.empty?
    args[:__schema_error] = "missing required #{missing.join(', ')}"
    args[:__expected] = req
    args[:__schema_hint] =
      "Expected keys: #{req.join(', ')}. " \
      'Do not send value/placeholder/ellipsis. ' \
      'Example: shell(command="uname -r") or pwn_eval(code="1+1").'
  end
  args
rescue StandardError
  opts[:args] || {}
end

.command_class(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 567

public_class_method def self.command_class(opts = {})
  cmd = opts[:payload].to_s.split.first.to_s
  cmd.empty? ? 'shell' : File.basename(cmd)
end

.deadline_s(opts = {}) ⇒ Object

Conservative wall-clock seconds for shell / pwn_eval. Explicit timeout is honored for any payload (1..TIMEOUT_MAX_S). Omit → host-derived default from loadavg / ncpu / MemAvailable. No tool-name sniffing: a 65k scan and ls use the same math.



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 276

public_class_method def self.deadline_s(opts = {})
  kind = opts[:kind].to_s.to_sym
  asked = opts[:timeout] || opts[:timeout_s]
  asked_i = asked.to_i
  return asked_i.clamp(1, TIMEOUT_MAX_S) if asked_i.positive?

  learned = predicted_timeout(command_class: command_class(payload: opts[:payload].to_s))
  return learned.clamp(1, TIMEOUT_MAX_S) if learned.to_i.positive?

  snap = host_load
  ncpu = [snap[:ncpu].to_i, 1].max
  load1 = snap[:load1].to_f
  mem = snap[:mem_avail_mb].to_i
  default_max = kind == :shell ? 180 : 90
  base = kind == :shell ? 30 : 20
  base += 15 if load1 > ncpu
  base += 10 if load1 > (ncpu * 1.5)
  base += 10 if mem.positive? && mem < 512
  base.clamp(8, default_max)
end

.denial(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 237

public_class_method def self.denial(opts = {})
  {
    code: opts[:code].to_s,
    rule_id: opts[:rule_id].to_s,
    token: opts[:token].to_s,
    offending_token: opts[:offending_token] || opts[:token].to_s,
    suggestion: opts[:suggestion].to_s
  }
end

.help ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 612

public_class_method def self.help
  puts "USAGE:
    # Decode {encoding:base64,data:} onto command or code.
    #{self}.unwrap_payload(
      args: 'required - Hash that may contain encoding and data',
      key: 'optional - destination key (defaults to command)'
    )

    # Run present and return its result
    #{self}.present?(
      value: 'required - integer or string to pack/encode'
    )

    # Run placeholder and return its result
    #{self}.placeholder?(
      text: 'optional - text value consumed by #placeholder?'
    )

    # Run bashism and return its result
    #{self}.bashism?(
      text: 'optional - text value consumed by #bashism?'
    )

    # Strip quoted heredocs and single-quoted strings before bash-syntax lint.
    #{self}.shell_syntax_surface(
      text: 'required - command string to lint'
    )

    # Mint a per-thread session canary token stored on Thread.current.
    #{self}.mint_canary(
      bytes: 'optional - unused reserved length (HMAC uses 16 hex chars)',
      turn: 'optional - turn number mixed into the HMAC',
      session_id: 'optional - session id mixed into the HMAC'
    )

    # True when text contains the current session canary.
    #{self}.canary_leak?(
      text: 'required - outbound argv or URL to inspect'
    )

    # Heuristic injection score for tool output (ignore-previous, tool-call spoof).
    #{self}.injection_score(
      text: 'required - tool output to score'
    )

    # Prefix high-score tool output with a QUARANTINED frame.
    #{self}.quarantine_output(
      text: 'required - tool output to wrap if injection_score >= 3'
    )

    # Run shell bash and return its result
    #{self}.shell_bash?

    # Run shell name and return its result
    #{self}.shell_name

    # Run protect http and return its result
    #{self}.protect_http!

    # Run protect core constants and return its result
    #{self}.protect_core_constants!

    # Coerce common wrong keys onto the first required schema field
    #{self}.coerce_args(
      args: 'optional - args value consumed by #coerce_args',
      required: 'optional - Array required value consumed by #coerce_args'
    )

    # Build a machine-readable invalid_payload denial (SYNTAX_DENY by default).
    #{self}.invalid_payload(
      hint: 'optional - operator-facing hint string',
      shell: 'optional - shell name (defaults to shell_name)',
      code: 'optional - denial code (defaults to SYNTAX_DENY)',
      rule_id: 'optional - rule identifier (defaults to payload)',
      offending_token: 'optional - exact rejected token span',
      suggestion: 'optional - how to rewrite the payload',
      text: 'optional - original payload used to compute byte_range',
      byte_range: 'optional - [start, stop] byte offsets of the offending span'
    )

    # Build a machine-readable guard denial (SCOPE_DENY, CANARY_DENY, ...).
    #{self}.denial(
      code: 'required - denial code such as SCOPE_DENY',
      rule_id: 'optional - rule identifier',
      token: 'optional - out-of-scope host or CIDR',
      offending_token: 'optional - exact rejected token span',
      suggestion: 'optional - how to stay in scope'
    )

    # Run host load and return its result
    #{self}.host_load

    # Conservative wall-clock seconds for shell / pwn_eval
    #{self}.deadline_s(
      kind: 'optional - kind value consumed by #deadline_s',
      timeout: 'optional - seconds to wait before giving up (defaults to opts[:timeout_s])',
      timeout_s: 'optional - timeout s value consumed by #deadline_s'
    )

    # Run reset timeout budget and return its result
    #{self}.reset_timeout_budget

    # Run reset timeout budget and return its result
    #{self}.reset_timeout_budget!

    # Run mutation count and return its result
    #{self}.mutation_count

    # Run payload spent and return its result
    #{self}.payload_spent

    # Run note timeout and return its result
    #{self}.note_timeout!(
      timeout: 'optional - seconds to wait before giving up'
    )

    # Run next timeout and return its result
    #{self}.next_timeout(
      timeout: 'optional - seconds to wait before giving up',
      spent: 'optional - spent value consumed by #next_timeout'
    )

    # Timeout policy (loop-law, not a skill):
    #{self}.timeout_lesson(
      tool: 'required - tool value consumed by #timeout_lesson',
      timeout: 'required - seconds to wait before giving up'
    )

    # Run timeout result and return its result
    #{self}.timeout_result(
      timeout: 'required - seconds to wait before giving up',
      tool: 'optional - tool value consumed by #timeout_result',
      payload: 'optional - payload value consumed by #timeout_result',
      task: 'optional - task value consumed by #timeout_result',
      stdout: 'optional - stdout value consumed by #timeout_result',
      stderr: 'optional - stderr value consumed by #timeout_result',
      shell: 'required - shell value consumed by #timeout_result (defaults to shell_name)'
    )

    # Run timeout prior count and return its result
    #{self}.timeout_prior_count(
      tool: 'optional - tool value consumed by #timeout_prior_count'
    )

    # Run refuse copied persist and return its result
    #{self}.refuse_copied_persist?(
      name: 'optional - binary or identifier name',
      args: 'optional - args value consumed by #refuse_copied_persist?'
    )

    # Refuse a command whose IPs/hosts are outside the ~/.pwn scope yaml allowlists.
    #{self}.scope_refusal(
      command: 'required - shell command to inspect for IPs and hostnames'
    )

    # True when ip is RFC1918 or loopback (always in-scope unless strict).
    #{self}.rfc1918?(
      ip: 'required - IPv4 address'
    )

    # True when ip is inside cidr (e.g. 10.1.2.3 in 10.0.0.0/8).
    #{self}.ip_in_cidr?(
      ip: 'required - IPv4 address',
      cidr: 'required - CIDR (e.g. 10.0.0.0/8)'
    )

    # First token of a payload used as the runtime class key.
    #{self}.command_class(
      payload: 'required - command string whose first token is the class'
    )

    # Append an observed runtime sample for a command class.
    #{self}.record_runtime(
      command_class: 'required - class key from the command first token',
      seconds: 'required - observed wall seconds'
    )

    # p95 * 1.5 timeout from ~/.pwn/metrics/runtimes.json, or nil.
    #{self}.predicted_timeout(
      command_class: 'required - class key to look up'
    )

    # True when predicted timeout exceeds 120s (route to job_run).
    #{self}.auto_job?(
      command_class: 'optional - class key',
      predicted: 'optional - override predicted seconds',
      payload: 'optional - command string if class omitted'
    )

    # Evaluate ~/.pwn/toolguard.yaml first-match rules.
    #{self}.policy_decision(
      name: 'required - tool name',
      args: 'required - Hash of tool arguments'
    )

    # Block network args outside the active engagement scope.
    #{self}.scope_check!(
      args: 'optional - Hash of tool arguments',
      command: 'optional - command string to scan for hosts',
      text: 'optional - free-form blob to scan'
    )

    # Print the AUTHOR(S) string for this module.
    #{self}.authors
  "
  constants.sort
end

.host_load(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 247

public_class_method def self.host_load(opts = {})
  return { ncpu: 1, load1: 0.0, mem_avail_mb: 0 } unless opts.is_a?(Hash)

  ncpu = File.readable?('/proc/cpuinfo') ? File.read('/proc/cpuinfo').scan(/^processor/).size : 0
  ncpu = 1 if ncpu < 1
  load1 = 0.0
  load1 = File.read('/proc/loadavg').to_s.split[0].to_f if File.readable?('/proc/loadavg')
  avail = 0
  if File.readable?('/proc/meminfo')
    File.foreach('/proc/meminfo') do |ln|
      next unless ln.start_with?('MemAvailable:')

      avail = ln.split[1].to_i / 1024
      break
    end
  end
  { ncpu: ncpu, load1: load1, mem_avail_mb: avail }
rescue StandardError
  { ncpu: 1, load1: 0.0, mem_avail_mb: 0 }
end

.injection_score(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 122

public_class_method def self.injection_score(opts = {})
  t = opts[:text].to_s
  score = 0
  score += 3 if t.match?(/ignore (all )?(previous|prior) (instructions|directives)/i)
  score += 2 if t.match?(/system:\s|tool_call|function_call/i)
  score += 2 if t.match?(/\bexfiltrat|\bdo not tell (the )?(user|operator)/i)
  score
end

.invalid_payload(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 212

public_class_method def self.invalid_payload(opts = {})
  hint = opts[:hint].to_s
  tok = opts[:offending_token].to_s
  text = opts[:text].to_s
  range = opts[:byte_range]
  if range.nil? && !tok.empty? && !text.empty?
    idx = text.index(tok)
    range = [idx, idx + tok.bytesize] if idx
  end
  {
    stdout: '',
    stderr: hint,
    exit: 2,
    error: 'invalid_payload',
    code: (opts[:code] || 'SYNTAX_DENY').to_s,
    rule_id: (opts[:rule_id] || 'payload').to_s,
    offending_token: tok,
    byte_range: range,
    max_payload_bytes: MAX_PAYLOAD_BYTES,
    suggestion: opts[:suggestion].to_s,
    hint: hint,
    shell: opts[:shell] || shell_name
  }
end

.ip_in_cidr?(opts = {}) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pwn/ai/agent/tool_guard.rb', line 554

public_class_method def self.ip_in_cidr?(opts = {})
  ip = opts[:ip].to_s.split('.').map(&:to_i)
  cidr, bits = opts[:cidr].to_s.split('/')
  return false if ip.length != 4 || cidr.to_s.split('.').length != 4

  mask = bits.to_i
  mask = 32 if mask <= 0
  a = ip.inject(0) { |acc, oct| (acc << 8) + oct }
  b = cidr.split('.').map(&:to_i).inject(0) { |acc, oct| (acc << 8) + oct }
  shift = 32 - mask
  (a >> shift) == (b >> shift)
end

.mint_canary(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 89

public_class_method def self.mint_canary(opts = {})
  _bytes = opts[:bytes]
  turn = (opts[:turn] || Thread.current[:pwn_loop_iter] || 0).to_i
  sid = (opts[:session_id] || Thread.current[:pwn_session_id] || 'sess').to_s
  key = (Thread.current[:pwn_canary_key] ||= SecureRandom.hex(16))
  tok = OpenSSL::HMAC.hexdigest('SHA256', key, "#{sid}:#{turn}")[0, 16]
  hist = Thread.current[:pwn_canary_hist] ||= []
  hist << tok
  hist.shift while hist.length > 4
  Thread.current[:pwn_canary] = tok
  tok
end

.mutation_count(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 310

public_class_method def self.mutation_count(opts = {})
  return 0 unless opts.is_a?(Hash)

  timeout_mutations[task_key(opts)].to_i
end

.next_timeout(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 337

public_class_method def self.next_timeout(opts = {})
  base = opts[:timeout].to_i
  base = 1 if base < 1
  spent = opts.key?(:spent) ? opts[:spent].to_i : payload_spent(opts)
  remaining = TIMEOUT_MAX_S - spent
  remaining = 0 if remaining.negative?
  [base + TIMEOUT_STEP_S, remaining, TIMEOUT_MAX_S].min
end

.note_timeout!(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 322

public_class_method def self.note_timeout!(opts = {})
  return 0 unless opts.is_a?(Hash)

  timeout = opts[:timeout].to_i
  timeout = 1 if timeout < 1
  key = payload_key(opts)
  timeout_spent[key] = timeout_spent[key].to_i + timeout
  if budget_exhausted?(opts.merge(spent: timeout_spent[key])) && !timeout_mutated[key]
    timeout_mutated[key] = true
    tkey = task_key(opts)
    timeout_mutations[tkey] = timeout_mutations[tkey].to_i + 1
  end
  timeout_spent[key]
end

.payload_spent(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 316

public_class_method def self.payload_spent(opts = {})
  return 0 unless opts.is_a?(Hash)

  timeout_spent[payload_key(opts)].to_i
end

.placeholder?(opts = {}) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pwn/ai/agent/tool_guard.rb', line 61

public_class_method def self.placeholder?(opts = {})
  s = opts[:text].to_s.dup
  s.gsub!(/<<[-~]?\s*(['"])(\w+)\1.*?^\2\s*$/m, ' ')
  s.gsub!(/<<[-~]?\s*(\w+).*?^\1\s*$/m, ' ')
  s.gsub!(/'[^']*'/, "''")
  s.gsub!(/"([^"\\]|\\.)*"/, '""')
  PLACEHOLDER_RX.match?(s)
rescue StandardError
  false
end

.policy_decision(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 500

public_class_method def self.policy_decision(opts = {})
  name = opts[:name].to_s
  blob = opts[:args].inspect
  path = File.join(Dir.home, '.pwn', 'toolguard.yaml')
  return nil unless File.file?(path)

  require 'yaml'
  doc = YAML.safe_load_file(path, permitted_classes: [Symbol]) || {}
  Array(doc['rules'] || doc[:rules]).each do |rule|
    next unless rule.is_a?(Hash)

    tool = (rule['tool'] || rule[:tool]).to_s
    next unless tool.empty? || tool == name

    pat = (rule['arg_pattern'] || rule[:arg_pattern]).to_s
    next if pat.empty? || blob.match?(Regexp.new(pat)) == false

    action = (rule['action'] || rule[:action] || 'allow').to_s
    next if action == 'allow'

    return {
      action: action,
      success: false,
      error: (rule['reason'] || rule[:reason] || 'toolguard policy deny').to_s,
      code: 'POLICY_DENY',
      tool: name
    }
  end
  nil
rescue StandardError
  nil
end

.predicted_timeout(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 586

public_class_method def self.predicted_timeout(opts = {})
  samples = Array(load_runtimes[opts[:command_class].to_s]).map(&:to_f)
  return nil if samples.empty?

  sorted = samples.sort
  idx = [(sorted.length * 0.95).ceil - 1, 0].max
  (sorted[idx] * 1.5).ceil
end

.present?(opts = {}) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pwn/ai/agent/tool_guard.rb', line 56

public_class_method def self.present?(opts = {})
  value = opts.is_a?(Hash) ? opts[:value] : opts
  !value.nil? && !value.to_s.strip.empty?
end

.protect_core_constants! ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 160

public_class_method def self.protect_core_constants!
  @core_mods ||= {}
  CORE_CONSTS.each do |name|
    if Object.const_defined?(name, false)
      cur = Object.const_get(name, false)
      @core_mods[name] = cur if cur.is_a?(Module) && @core_mods[name].nil?
      next if cur.is_a?(Module)

      Object.send(:remove_const, name)
    end
    next unless @core_mods[name].is_a?(Module)
    next if Object.const_defined?(name, false) && Object.const_get(name, false).equal?(@core_mods[name])

    Object.const_set(name, @core_mods[name])
  end
  unless Object.const_defined?(:HTTP, false) && Object.const_get(:HTTP, false).is_a?(Module)
    require 'http/cookie_jar'
    @core_mods[:HTTP] = Object.const_get(:HTTP) if Object.const_defined?(:HTTP) && Object.const_get(:HTTP).is_a?(Module)
  end
  @core_mods
rescue StandardError
  nil
end

.protect_http! ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 156

public_class_method def self.protect_http!
  protect_core_constants!
end

.quarantine_output(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 131

public_class_method def self.quarantine_output(opts = {})
  text = opts[:text].to_s
  score = injection_score(text: text)
  return text unless score >= 3

  "[QUARANTINED injection_score=#{score}]\n#{text}"
end

.record_runtime(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 572

public_class_method def self.record_runtime(opts = {})
  klass = opts[:command_class].to_s
  secs = opts[:seconds].to_f
  return {} if klass.empty? || secs <= 0

  data = load_runtimes
  data[klass] ||= []
  data[klass] << secs
  data[klass] = data[klass].last(50)
  FileUtils.mkdir_p(File.dirname(RUNTIMES_FILE))
  File.write(RUNTIMES_FILE, JSON.generate(data))
  data
end

.refuse_copied_persist?(opts = {}) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pwn/ai/agent/tool_guard.rb', line 453

public_class_method def self.refuse_copied_persist?(opts = {})
  name = opts[:name].to_s
  return false unless %w[memory_remember skills_update].include?(name)

  args = opts[:args]
  args = {} unless args.is_a?(Hash)
  text = [args[:value], args['value'], args[:lesson], args['lesson']].compact.join("\n")
  last = Thread.current[:pwn_last_tool_body].to_s
  return false if last.length < 80 || text.strip.length < 40

  a = text.downcase.scan(/[a-z0-9]{4,}/).uniq
  b = last.downcase.scan(/[a-z0-9]{4,}/)
  return false if a.empty? || b.empty?

  ((a & b).length.to_f / a.length) >= 0.6
rescue StandardError
  false
end

.reset_timeout_budget(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 297

public_class_method def self.reset_timeout_budget(opts = {})
  return :noop unless opts.is_a?(Hash)

  @timeout_spent = {}
  @timeout_mutations = {}
  @timeout_mutated = {}
  :reset
end

.reset_timeout_budget! ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 306

public_class_method def self.reset_timeout_budget!
  reset_timeout_budget
end

.rfc1918?(opts = {}) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pwn/ai/agent/tool_guard.rb', line 543

public_class_method def self.rfc1918?(opts = {})
  oct = opts[:ip].to_s.split('.').map(&:to_i)
  return false unless oct.length == 4

  return true if [10, 127].include?(oct[0])
  return true if oct[0] == 192 && oct[1] == 168
  return true if oct[0] == 172 && oct[1].between?(16, 31)

  false
end

.scope_check!(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 533

public_class_method def self.scope_check!(opts = {})
  return nil unless defined?(Engagement)

  Engagement.deny_if_out_of_scope(
    args: opts[:args],
    command: opts[:command] || opts[:args].inspect,
    text: opts[:text]
  )
end

.scope_refusal(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 472

public_class_method def self.scope_refusal(opts = {})
  cmd = opts[:command].to_s
  path = File.join(Dir.home, '.pwn', 'scope.yaml')
  return nil unless File.file?(path)

  require 'yaml'
  scope = YAML.safe_load_file(path, permitted_classes: [Symbol]) || {}
  return nil if scope.nil? || scope.empty?

  expiry = (scope['expiry'] || scope[:expiry]).to_s
  return denial(code: 'SCOPE_DENY', rule_id: 'expiry', token: expiry, suggestion: 'renew ~/.pwn/scope.yaml expiry') unless expiry.empty? || Time.parse(expiry) >= Time.now

  allow = Array(scope['cidr_allowlist'] || scope[:cidr_allowlist] || scope['cidrs'] || scope[:cidrs]).map(&:to_s)
  domains = Array(scope['domain_allowlist'] || scope[:domain_allowlist] || scope['domains'] || scope[:domains]).map(&:to_s)
  return nil if allow.empty? && domains.empty?

  ips = cmd.scan(/\b\d{1,3}(?:\.\d{1,3}){3}\b/)
  hosts = cmd.scan(/\b[a-z0-9][a-z0-9.-]+\.[a-z]{2,}\b/i)
  bad_ip = allow.any? ? ips.find { |ip| !rfc1918?(ip: ip) && allow.none? { |cidr| ip_in_cidr?(ip: ip, cidr: cidr) } } : nil
  bad_host = domains.any? ? hosts.find { |h| domains.none? { |d| h.downcase.end_with?(d.downcase) } } : nil
  hit = bad_ip || bad_host
  return nil unless hit

  denial(code: 'SCOPE_DENY', rule_id: 'allowlist', token: hit, suggestion: 'use an in-scope host or CIDR')
rescue StandardError
  nil
end

.shell_bash? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pwn/ai/agent/tool_guard.rb', line 139

public_class_method def self.shell_bash?
  v = (PWN::Env.dig(:ai, :agent, :shell_bash) if defined?(PWN::Env))
  v == true || v.to_s.match?(/\A(1|true|yes|on)\z/i)
rescue StandardError
  false
end

.shell_name ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 146

public_class_method def self.shell_name
  shell_bash? ? 'bash -lc' : '/bin/sh'
end

.shell_syntax_surface(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 82

public_class_method def self.shell_syntax_surface(opts = {})
  s = opts[:text].to_s.dup
  s.gsub!(/<<[-~]?\s*(['"])(\w+)\1.*?^\2\s*$/m, ' ')
  s.gsub!(/'[^']*'/, "''")
  s
end

.timeout_lesson(opts = {}) ⇒ Object

Timeout policy (loop-law, not a skill):

  1. Same payload: timeout += 180 until the 3-hour budget is gone.
  2. At the 3-hour cap: rewrite ruby/command for the same goal (one mutation). Max MUTATION_MAX mutations per task.
  3. After MUTATION_MAX mutations: stop (exhausted).


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# File 'lib/pwn/ai/agent/tool_guard.rb', line 351

public_class_method def self.timeout_lesson(opts = {})
  return { scenario: :construction, error: '', hint: '' } unless opts.is_a?(Hash)

  tool = opts[:tool].to_s
  timeout = opts[:timeout].to_i
  spent = payload_spent(opts)
  spent_after = spent >= timeout && timeout.positive? ? spent : spent + [timeout, 1].max
  nxt = next_timeout(timeout: timeout, spent: spent_after)
  mutations = mutation_count(opts)
  if budget_exhausted?(opts.merge(timeout: timeout, spent: spent_after))
    if mutations >= MUTATION_MAX
      {
        scenario: :exhausted,
        error: "#{tool} timeout: #{MUTATION_MAX} mutations exhausted for this task",
        hint: "This task hit the mutation cap (#{MUTATION_MAX} rewrites after " \
              '3-hour budgets). Do not retry the same payload. Report what ' \
              'was tried and what remains blocked.'
      }
    else
      {
        scenario: :construction,
        error: "#{tool} timeout: 3-hour budget exhausted; reconstruct payload to same goal",
        hint: "The #{tool} payload used its 3-hour budget. Generate different " \
              'ruby/command for the same goal. Mutation ' \
              "#{[mutations, 1].max}/#{MUTATION_MAX}."
      }
    end
  else
    {
      scenario: :deadline,
      error: "#{tool} timeout: deadline too short; retry with timeout += 180",
      hint: "Keep the same #{tool} payload. This timeout (#{timeout}s) was too " \
            "short. Retry with timeout += 180 (next_timeout=#{nxt})."
    }
  end
end

.timeout_prior_count(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 441

public_class_method def self.timeout_prior_count(opts = {})
  return 0 unless opts.is_a?(Hash)
  return 0 unless defined?(PWN::AI::Agent::Mistakes)

  tool = opts[:tool].to_s
  PWN::AI::Agent::Mistakes.for_tool(tool: tool, unresolved_only: true).count do |m|
    m[:shape].to_s == 'timeout' || m[:error].to_s.match?(/timeout/)
  end
rescue StandardError
  0
end

.timeout_result(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 388

public_class_method def self.timeout_result(opts = {})
  return { stdout: '', stderr: '', exit: nil, error: 'timeout', scenario: :deadline, hint: '', next_timeout: TIMEOUT_STEP_S, shell: shell_name } unless opts.is_a?(Hash)

  timeout = opts[:timeout].to_i
  note_timeout!(opts)
  lesson = timeout_lesson(
    tool: opts[:tool],
    payload: opts[:payload],
    timeout: timeout,
    task: opts[:task]
  )
  {
    stdout: opts[:stdout].to_s,
    stderr: opts[:stderr].to_s,
    exit: nil,
    error: "timeout after #{timeout}s",
    scenario: lesson[:scenario],
    hint: lesson[:hint],
    next_timeout: next_timeout(timeout: timeout, spent: payload_spent(opts)),
    mutations: mutation_count(opts),
    shell: opts[:shell] || shell_name
  }
end

.unwrap_payload(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 41

public_class_method def self.unwrap_payload(opts = {})
  args = opts[:args]
  return args unless args.is_a?(Hash)

  enc = (args[:encoding] || args['encoding']).to_s
  data = args[:data] || args['data']
  return args unless enc == 'base64' && !data.to_s.empty?

  raw = Base64.strict_decode64(data.to_s)
  key = (opts[:key] || :command).to_sym
  args.merge(key => raw)
rescue ArgumentError
  opts[:args]
end