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Viewing changes to dracut-module/password-agent.c

  • Committer: teddy at recompile
  • Date: 2020-02-05 20:32:33 UTC
  • Revision ID: teddy@recompile.se-20200205203233-450ojm36jseglq4m
Server: Stagger checker runs when creating clients

To avoid checkers for all clients all running at the same time
periodically, schedule every initially scheduled future checker to run
at a time in the future a random amount of the interval, from the
current time.

* mandos (Client.init_checker): Schedule the first scheduled future
  run of a checker to be a randomly chosen amount of this client's
  "interval" (instead of a full interval).

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dracut-module/password-agent.c
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/*
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 * Mandos password agent - Simple password agent to run Mandos client
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 *
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 * Copyright © 2019-2020 Teddy Hogeborn
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 * Copyright © 2019-2020 Björn Påhlsson
 
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 * Copyright © 2019 Teddy Hogeborn
 
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 * Copyright © 2019 Björn Påhlsson
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 * 
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 * This file is part of Mandos.
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 * 
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#include <sysexits.h>           /* EX_USAGE, EX_OSERR, EX_OSFILE */
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#include <errno.h>              /* errno, error_t, EACCES,
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                                   ENAMETOOLONG, ENOENT, ENOTDIR,
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                                   ENOMEM, EEXIST, ECHILD, EPERM,
 
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                                   EEXIST, ECHILD, EPERM, ENOMEM,
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                                   EAGAIN, EINTR, ENOBUFS, EADDRINUSE,
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                                   ECONNREFUSED, ECONNRESET,
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                                   ETOOMANYREFS, EMSGSIZE, EBADF,
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                                   ARGP_ERR_UNKNOWN, ARGP_KEY_ARGS,
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                                   struct argp, argp_parse(),
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                                   ARGP_NO_EXIT */
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#include <stdint.h>             /* SIZE_MAX */
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#include <unistd.h>             /* uid_t, gid_t, close(), pipe2(),
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                                   fork(), _exit(), dup2(),
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                                   STDOUT_FILENO, setresgid(),
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                                   IN_EXCL_UNLINK, IN_ONLYDIR,
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                                   struct inotify_event */
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#include <fnmatch.h>            /* fnmatch(), FNM_FILE_NAME */
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#include <stdio.h>              /* asprintf(), FILE, stderr, fopen(),
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                                   fclose(), getline(), sscanf(),
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                                   feof(), ferror(), rename(),
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                                   fdopen(), fprintf(), fscanf() */
 
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#include <stdio.h>              /* asprintf(), FILE, fopen(),
 
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                                   getline(), sscanf(), feof(),
 
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                                   ferror(), fclose(), stderr,
 
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                                   rename(), fdopen(), fprintf(),
 
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                                   fscanf() */
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#include <glib.h>    /* GKeyFile, g_key_file_free(), g_key_file_new(),
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                        GError, g_key_file_load_from_file(),
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                        G_KEY_FILE_NONE, TRUE, G_FILE_ERROR_NOENT,
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__attribute__((nonnull, warn_unused_result))
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bool add_to_queue(task_queue *const queue, const task_context task){
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  if((queue->length + 1) > (SIZE_MAX / sizeof(task_context))){
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    /* overflow */
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    error(0, ENOMEM, "Failed to allocate %" PRIuMAX
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          " tasks for queue->tasks", (uintmax_t)(queue->length + 1));
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    errno = ENOMEM;
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    return false;
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  }
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  const size_t needed_size = sizeof(task_context)*(queue->length + 1);
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  if(needed_size > (queue->allocated)){
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    task_context *const new_tasks = realloc(queue->tasks,
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  }
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  close(pipefds[1]);
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  if(pid == -1){
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    error(0, errno, "Failed to fork()");
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    close(pipefds[0]);
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    return false;
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  }
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  if(not add_to_queue(queue, (task_context){
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        .func=wait_for_mandos_client_exit,
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        .pid=pid,
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  g_assert_true(queue->tasks[0].func == dummy_func);
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}
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static void test_add_to_queue_overflow(__attribute__((unused))
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                                       test_fixture *fixture,
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                                       __attribute__((unused))
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                                       gconstpointer user_data){
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  __attribute__((cleanup(cleanup_queue)))
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    task_queue *queue = create_queue();
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  g_assert_nonnull(queue);
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  g_assert_true(queue->length == 0);
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  queue->length = SIZE_MAX / sizeof(task_context); /* fake max size */
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  FILE *real_stderr = stderr;
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  FILE *devnull = fopen("/dev/null", "we");
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  g_assert_nonnull(devnull);
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  stderr = devnull;
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  const bool ret = add_to_queue(queue,
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                                (task_context){ .func=dummy_func });
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  g_assert_true(errno == ENOMEM);
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  g_assert_false(ret);
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  stderr = real_stderr;
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  g_assert_cmpint(fclose(devnull), ==, 0);
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  queue->length = 0;            /* Restore real size */
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}
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static void dummy_func(__attribute__((unused))
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                       const task_context task,
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                       __attribute__((unused))
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    }
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    exit(EXIT_SUCCESS);
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  }
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  if(pid == -1){
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    error(EXIT_FAILURE, errno, "Failed to fork()");
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  }
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  int status;
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  waitpid(pid, &status, 0);
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  if(WIFEXITED(status) and (WEXITSTATUS(status) == EXIT_SUCCESS)){
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                                           test_fixture *fixture,
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                                           __attribute__((unused))
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                                           gconstpointer user_data){
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#ifndef __amd64__
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  g_test_skip("Skipping EMSGSIZE test on non-AMD64 platform");
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#else
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  __attribute__((cleanup(cleanup_close)))
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    const int epoll_fd = epoll_create1(EPOLL_CLOEXEC);
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  g_assert_cmpint(epoll_fd, >=, 0);
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  g_assert_cmpuint((unsigned int)queue->length, ==, 0);
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  g_assert_true(string_set_contains(cancelled_filenames,
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                                    question_filename));
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#endif
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}
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static void test_send_password_to_socket_retry(__attribute__((unused))
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  test_add("/parse_arguments/mixed", test_parse_arguments_mixed);
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  test_add("/queue/create", test_create_queue);
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  test_add("/queue/add", test_add_to_queue);
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  test_add("/queue/add/overflow", test_add_to_queue_overflow);
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  test_add("/queue/has_question/empty",
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           test_queue_has_question_empty);
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  test_add("/queue/has_question/false",