Class: Cap2::Process

Inherits:
Object
  • Object
show all
Defined in:
lib/cap2/process.rb,
ext/cap2/cap2.c

Overview

A class with methods for managing capabilities for the process with pid provided to the initialize method.

Instance Method Summary collapse

Constructor Details

#initialize(pid) ⇒ Process

Initialize a new Process object for the given pid.



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# File 'lib/cap2/process.rb', line 6

def initialize(pid)
  @pid  = pid
  @caps = getcaps
end

Instance Method Details

#disable(capability) ⇒ Object

Disable the given capability for this process.



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# File 'lib/cap2/process.rb', line 37

def disable(capability)
  check_pid
  @caps[:effective].delete(capability)
  save
end

#enable(capability) ⇒ Object

Enable the given capability for this process.



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# File 'lib/cap2/process.rb', line 30

def enable(capability)
  check_pid
  @caps[:effective].add(capability)
  save
end

#enabled?(*capabilities) ⇒ Boolean

Returns whether the given capabilities are enabled

Returns:

  • (Boolean) 


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# File 'lib/cap2/process.rb', line 18

def enabled?(*capabilities)
  reload
  @caps[:effective].superset? Set[*capabilities]
end

#getcaps ⇒ Object 



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# File 'ext/cap2/cap2.c', line 105

VALUE cap2_process_getcaps(VALUE self) {
  cap_t cap_d;
  int pid;
  VALUE result;

  pid = cap2_process_pid(self);

  cap_d = cap_get_pid(pid);

  if (cap_d == NULL) {
    rb_raise(
      rb_eRuntimeError,
      "Failed to get capabilities for proccess %d: (%s)\n",
      pid, strerror(errno)
    );
  } else {
    result = cap2_caps_to_hash(cap_d);
    cap_free(cap_d);
    return result;
  }
}

#inheritable?(capabilities) ⇒ Boolean

Returns whether the given capabilities are inheritable

Returns:

  • (Boolean) 


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# File 'lib/cap2/process.rb', line 24

def inheritable?(capabilities)
  reload
  @caps[:inheritable].superset? Set[*capabilities]
end

#permitted?(*capabilities) ⇒ Boolean

Returns whether the given capabilities are permitted

Returns:

  • (Boolean) 


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# File 'lib/cap2/process.rb', line 12

def permitted?(*capabilities)
  reload
  @caps[:permitted].superset? Set[*capabilities]
end

#save ⇒ Object

Set the capabilities for self from the caps hash stored in @caps.



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# File 'ext/cap2/cap2.c', line 130

VALUE cap2_process_setcaps(VALUE self) {
  int i;
  cap_t cap_d;
  VALUE caps, cap_array, cap_sym;
  cap_value_t cap_values[__CAP_COUNT];

  cap_d = cap_init();

  caps = rb_iv_get(self, "@caps");

  // permitted
  cap_array = rb_funcall(
    rb_hash_aref(caps, ID2SYM(rb_intern("permitted"))),
    rb_intern("to_a"),
    0
  );

  for(i = 0; i < RARRAY_LEN(cap_array); i++) {
    cap_sym = RARRAY_PTR(cap_array)[i];
    cap_values[i] = cap2_sym_to_cap(cap_sym);
  }

  cap_set_flag(cap_d, CAP_PERMITTED, i, cap_values, CAP_SET);

  // effective
  cap_array = rb_funcall(
    rb_hash_aref(caps, ID2SYM(rb_intern("effective"))),
    rb_intern("to_a"),
    0
  );

  for(i = 0; i < RARRAY_LEN(cap_array); i++) {
    cap_sym = RARRAY_PTR(cap_array)[i];
    cap_values[i] = cap2_sym_to_cap(cap_sym);
  }

  cap_set_flag(cap_d, CAP_EFFECTIVE, i, cap_values, CAP_SET);

  // inheritable
  cap_array = rb_funcall(
    rb_hash_aref(caps, ID2SYM(rb_intern("inheritable"))),
    rb_intern("to_a"),
    0
  );

  for(i = 0; i < RARRAY_LEN(cap_array); i++) {
    cap_sym = RARRAY_PTR(cap_array)[i];
    cap_values[i] = cap2_sym_to_cap(cap_sym);
  }

  cap_set_flag(cap_d, CAP_INHERITABLE, i, cap_values, CAP_SET);

  if(cap_set_proc(cap_d) == -1) {
    rb_raise(
      rb_eRuntimeError,
      "Failed to set capabilities for current process: (%s)\n",
      strerror(errno)
    );
  } else {
    cap_free(cap_d);
    return Qtrue;
  }
}