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*\.{3}\s*\}|\{\s*…\s*\})(?:$|[\s;|&])
/x
BASHISM_RX =

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

/
  \bPIPESTATUS\b
  |\$\{?RANDOM\}?\b
  |\[\[(?:\s|\z)
  |(?:^|[\s;|&])source\s+\S
  |<\([^)]
  |&>
/x
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 325

public_class_method def self.authors
  "AUTHOR(S):\n  0day Inc. <support@0dayinc.com>\n"
end

.bashism?(opts = {}) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pwn/ai/agent/tool_guard.rb', line 45

public_class_method def self.bashism?(opts = {})
  BASHISM_RX.match?(opts[:text].to_s)
rescue StandardError
  false
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 86

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

.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 151

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?

  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

.help ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 329

public_class_method def self.help
  puts <<~USAGE
    USAGE:
      PWN::AI::Agent::ToolGuard.placeholder?(text: '...')
      PWN::AI::Agent::ToolGuard.coerce_args(args: { value: 'id' }, required: %w[command])
      #{self}.authors
  USAGE
end

.host_load(opts = {}) ⇒ Object 



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

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

.invalid_payload(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 110

public_class_method def self.invalid_payload(opts = {})
  hint = opts[:hint].to_s
  {
    stdout: '',
    stderr: hint,
    exit: 2,
    error: 'invalid_payload',
    hint: hint,
    shell: opts[:shell] || shell_name
  }
end

.mutation_count(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 182

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 209

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 194

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 188

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 39

public_class_method def self.placeholder?(opts = {})
  PLACEHOLDER_RX.match?(opts[:text].to_s)
rescue StandardError
  false
end

.present?(opts = {}) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pwn/ai/agent/tool_guard.rb', line 34

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

.protect_http! ⇒ Object

RestClient uses HTTP::CookieJar. pwn_eval in TOPLEVEL_BINDING can assign HTTP = "/path/http" (a mkdir) and then every provider hop TypeErrors: "path is not a class/module".



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 65

public_class_method def self.protect_http!
  if Object.const_defined?(:HTTP, false)
    cur = Object.const_get(:HTTP)
    @http_mod = cur if cur.is_a?(Module) && @http_mod.nil?
    return cur if cur.is_a?(Module)

    Object.send(:remove_const, :HTTP)
  end
  if @http_mod.is_a?(Module)
    Object.const_set(:HTTP, @http_mod)
    return @http_mod
  end
  require 'http/cookie_jar'
  @http_mod = Object.const_get(:HTTP) if Object.const_defined?(:HTTP) && Object.const_get(:HTTP).is_a?(Module)
  @http_mod
rescue StandardError
  nil
end

.reset_timeout_budget(opts = {}) ⇒ Object 



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# File 'lib/pwn/ai/agent/tool_guard.rb', line 169

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 178

public_class_method def self.reset_timeout_budget!
  reset_timeout_budget
end

.shell_bash? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pwn/ai/agent/tool_guard.rb', line 51

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 58

public_class_method def self.shell_name
  shell_bash? ? 'bash -lc' : '/bin/sh'
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 223

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 313

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 260

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