storm-core/src/native/worker-launcher/impl/worker-launcher.c

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "configuration.h"
#include "worker-launcher.h"

#include <dirent.h>
#include <fcntl.h>
#include <fts.h>
#include <errno.h>
#include <grp.h>
#include <unistd.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>

static const int DEFAULT_MIN_USERID = 1000;

static const char* DEFAULT_BANNED_USERS[] = {"bin", 0};

//struct to store the user details
struct passwd *user_detail = NULL;

FILE* LOGFILE = NULL;
FILE* ERRORFILE = NULL;

static uid_t launcher_uid = -1;
static gid_t launcher_gid = -1;

char *concatenate(char *concat_pattern, char *return_path_name,
   int numArgs, ...);

void set_launcher_uid(uid_t user, gid_t group) {
  launcher_uid = user;
  launcher_gid = group;
}

/**
 * get the executable filename.
 */
char* get_executable() {
  char buffer[PATH_MAX];
  snprintf(buffer, PATH_MAX, "/proc/%u/exe", getpid());
  char *filename = malloc(PATH_MAX);
  if (NULL == filename) {
    fprintf(ERRORFILE, "malloc failed in get_executable\n");
    exit(-1);
  }
  ssize_t len = readlink(buffer, filename, PATH_MAX);
  if (len == -1) {
    fprintf(ERRORFILE, "Can't get executable name from %s - %s\n", buffer,
            strerror(errno));
    exit(-1);
  } else if (len >= PATH_MAX) {
    fprintf(ERRORFILE, "Executable name %.*s is longer than %d characters.\n",
            PATH_MAX, filename, PATH_MAX);
    exit(-1);
  }
  filename[len] = '\0';
  return filename;
}

int check_executor_permissions(char *executable_file) {
  errno = 0;
  char * resolved_path = realpath(executable_file, NULL);
  if (resolved_path == NULL) {
    fprintf(ERRORFILE,
        "Error resolving the canonical name for the executable : %s!",
        strerror(errno));
    return -1;
  }

  struct stat filestat;
  errno = 0;
  if (stat(resolved_path, &filestat) != 0) {
    fprintf(ERRORFILE, 
            "Could not stat the executable : %s!.\n", strerror(errno));
    return -1;
  }

  uid_t binary_euid = filestat.st_uid; // Binary's user owner
  gid_t binary_gid = filestat.st_gid; // Binary's group owner

  // Effective uid should be root
  if (binary_euid != 0) {
    fprintf(LOGFILE,
        "The worker-launcher binary should be user-owned by root.\n");
    return -1;
  }

  if (binary_gid != getgid()) {
    fprintf(LOGFILE, "The configured nodemanager group %d is different from"
            " the group of the executable %d\n", getgid(), binary_gid);
    return -1;
  }

  // check others do not have read/write/execute permissions
  if ((filestat.st_mode & S_IROTH) == S_IROTH || (filestat.st_mode & S_IWOTH)
      == S_IWOTH || (filestat.st_mode & S_IXOTH) == S_IXOTH) {
    fprintf(LOGFILE,
            "The worker-launcher binary should not have read or write or"
            " execute for others.\n");
    return -1;
  }

  // Binary should be setuid/setgid executable
  if ((filestat.st_mode & S_ISUID) == 0) {
    fprintf(LOGFILE, "The worker-launcher binary should be set setuid.\n");
    return -1;
  }

  return 0;
}

/**
 * Change the effective user id to limit damage.
 */
static int change_effective_user(uid_t user, gid_t group) {
  if (geteuid() == user && getegid() == group) {
    return 0;
  }
  if (seteuid(0) != 0) {
    return -1;
  }
  if (setegid(group) != 0) {
    fprintf(LOGFILE, "Failed to set effective group id %d - %s\n", group,
            strerror(errno));
    return -1;
  }
  if (seteuid(user) != 0) {
    fprintf(LOGFILE, "Failed to set effective user id %d - %s\n", user,
            strerror(errno));
    return -1;
  }
  return 0;
}

/**
 * Change the real and effective user and group to abandon the super user
 * priviledges.
 */
int change_user(uid_t user, gid_t group) {
  if (user == getuid() && user == geteuid() && 
      group == getgid() && group == getegid()) {
    return 0;
  }

  if (seteuid(0) != 0) {
    fprintf(LOGFILE, "unable to reacquire root - %s\n", strerror(errno));
    fprintf(LOGFILE, "Real: %d:%d; Effective: %d:%d\n",
	    getuid(), getgid(), geteuid(), getegid());
    return SETUID_OPER_FAILED;
  }
  if (setgid(group) != 0) {
    fprintf(LOGFILE, "unable to set group to %d - %s\n", group, 
            strerror(errno));
    fprintf(LOGFILE, "Real: %d:%d; Effective: %d:%d\n",
	    getuid(), getgid(), geteuid(), getegid());
    return SETUID_OPER_FAILED;
  }
  if (setuid(user) != 0) {
    fprintf(LOGFILE, "unable to set user to %d - %s\n", user, strerror(errno));
    fprintf(LOGFILE, "Real: %d:%d; Effective: %d:%d\n",
	    getuid(), getgid(), geteuid(), getegid());
    return SETUID_OPER_FAILED;
  }

  return 0;
}

/**
 * Utility function to concatenate argB to argA using the concat_pattern.
 */
char *concatenate(char *concat_pattern, char *return_path_name, 
                  int numArgs, ...) {
  va_list ap;
  va_start(ap, numArgs);
  int strlen_args = 0;
  char *arg = NULL;
  int j;
  for (j = 0; j < numArgs; j++) {
    arg = va_arg(ap, char*);
    if (arg == NULL) {
      fprintf(LOGFILE, "One of the arguments passed for %s in null.\n",
          return_path_name);
      return NULL;
    }
    strlen_args += strlen(arg);
  }
  va_end(ap);

  char *return_path = NULL;
  int str_len = strlen(concat_pattern) + strlen_args + 1;

  return_path = (char *) malloc(str_len);
  if (return_path == NULL) {
    fprintf(LOGFILE, "Unable to allocate memory for %s.\n", return_path_name);
    return NULL;
  }
  va_start(ap, numArgs);
  vsnprintf(return_path, str_len, concat_pattern, ap);
  va_end(ap);
  return return_path;
}

char *get_container_launcher_file(const char* work_dir) {
  return concatenate("%s/%s", "container launcher", 2, work_dir, CONTAINER_SCRIPT);
}

/**
 * Get the tmp directory under the working directory
 */
char *get_tmp_directory(const char *work_dir) {
  return concatenate("%s/%s", "tmp dir", 2, work_dir, TMP_DIR);
}

/**
 * Load the user information for a given user name.
 */
static struct passwd* get_user_info(const char* user) {
  int string_size = sysconf(_SC_GETPW_R_SIZE_MAX);
  void* buffer = malloc(string_size + sizeof(struct passwd));
  if (buffer == NULL) {
    fprintf(LOGFILE, "Malloc failed in get_user_info\n");
    return NULL;
  }
  struct passwd *result = NULL;
  if (getpwnam_r(user, buffer, buffer + sizeof(struct passwd), string_size,
		 &result) != 0) {
    free(buffer);
    buffer = NULL;
    fprintf(LOGFILE, "Can't get user information %s - %s\n", user,
	    strerror(errno));
    return NULL;
  }
  return result;
}

/**
 * Is the user a real user account?
 * Checks:
 *   1. Not root
 *   2. UID is above the minimum configured.
 *   3. Not in banned user list
 * Returns NULL on failure
 */
struct passwd* check_user(const char *user) {
  if (strcmp(user, "root") == 0) {
    fprintf(LOGFILE, "Running as root is not allowed\n");
    fflush(LOGFILE);
    return NULL;
  }
  char *min_uid_str = get_value(MIN_USERID_KEY);
  int min_uid = DEFAULT_MIN_USERID;
  if (min_uid_str != NULL) {
    char *end_ptr = NULL;
    min_uid = strtol(min_uid_str, &end_ptr, 10);
    if (min_uid_str == end_ptr || *end_ptr != '\0') {
      fprintf(LOGFILE, "Illegal value of %s for %s in configuration\n", 
	      min_uid_str, MIN_USERID_KEY);
      fflush(LOGFILE);
      free(min_uid_str);
      min_uid_str = NULL;
      return NULL;
    }
    free(min_uid_str);
    min_uid_str = NULL;
  }
  struct passwd *user_info = get_user_info(user);
  if (NULL == user_info) {
    fprintf(LOGFILE, "User %s not found\n", user);
    fflush(LOGFILE);
    return NULL;
  }
  if (user_info->pw_uid < min_uid) {
    fprintf(LOGFILE, "Requested user %s has id %d, which is below the "
	    "minimum allowed %d\n", user, user_info->pw_uid, min_uid);
    fflush(LOGFILE);
    free(user_info);
    user_info = NULL;
    return NULL;
  }
  char **banned_users = get_values(BANNED_USERS_KEY);
  char **banned_user = (banned_users == NULL) ? 
    (char**) DEFAULT_BANNED_USERS : banned_users;
  for(; *banned_user; ++banned_user) {
    if (strcmp(*banned_user, user) == 0) {
      free(user_info);
      user_info = NULL;
      if (banned_users != (char**)DEFAULT_BANNED_USERS) {
        free_values(banned_users);
        banned_users = NULL;
      }
      fprintf(LOGFILE, "Requested user %s is banned\n", user);
      return NULL;
    }
  }
  if (banned_users != NULL && banned_users != (char**)DEFAULT_BANNED_USERS) {
    free_values(banned_users);
    banned_users = NULL;
  }
  return user_info;
}

/**
 * function used to populate and user_details structure.
 */
int set_user(const char *user) {
  // free any old user
  if (user_detail != NULL) {
    free(user_detail);
    user_detail = NULL;
  }
  user_detail = check_user(user);
  if (user_detail == NULL) {
    return -1;
  }

  if (geteuid() == user_detail->pw_uid) {
    return 0;
  }

  if (initgroups(user, user_detail->pw_gid) != 0) {
    fprintf(LOGFILE, "Error setting supplementary groups for user %s: %s\n",
        user, strerror(errno));
    return -1;
  }

  return change_effective_user(user_detail->pw_uid, user_detail->pw_gid);
}

/**
 * Open a file as the node manager and return a file descriptor for it.
 * Returns -1 on error
 */
static int open_file_as_nm(const char* filename) {
  uid_t user = geteuid();
  gid_t group = getegid();
  if (change_effective_user(launcher_uid, launcher_gid) != 0) {
    return -1;
  }
  int result = open(filename, O_RDONLY);
  if (result == -1) {
    fprintf(LOGFILE, "Can't open file %s as node manager - %s\n", filename,
	    strerror(errno));
  }
  if (change_effective_user(user, group)) {
    result = -1;
  }
  return result;
}

/**
 * Copy a file from a fd to a given filename.
 * The new file must not exist and it is created with permissions perm.
 * The input stream is closed.
 * Return 0 if everything is ok.
 */
static int copy_file(int input, const char* in_filename, 
		     const char* out_filename, mode_t perm) {
  const int buffer_size = 128*1024;
  char buffer[buffer_size];
  int out_fd = open(out_filename, O_WRONLY|O_CREAT|O_EXCL|O_NOFOLLOW, perm);
  if (out_fd == -1) {
    fprintf(LOGFILE, "Can't open %s for output - %s\n", out_filename, 
            strerror(errno));
    return -1;
  }
  ssize_t len = read(input, buffer, buffer_size);
  while (len > 0) {
    ssize_t pos = 0;
    while (pos < len) {
      ssize_t write_result = write(out_fd, buffer + pos, len - pos);
      if (write_result <= 0) {
	fprintf(LOGFILE, "Error writing to %s - %s\n", out_filename,
		strerror(errno));
	close(out_fd);
	return -1;
      }
      pos += write_result;
    }
    len = read(input, buffer, buffer_size);
  }
  if (len < 0) {
    fprintf(LOGFILE, "Failed to read file %s - %s\n", in_filename, 
	    strerror(errno));
    close(out_fd);
    return -1;
  }
  if (close(out_fd) != 0) {
    fprintf(LOGFILE, "Failed to close file %s - %s\n", out_filename, 
	    strerror(errno));
    return -1;
  }
  close(input);
  return 0;
}

int setup_stormdist(FTSENT* entry, uid_t euser) {
  if (lchown(entry->fts_path, euser, launcher_gid) != 0) {
    fprintf(ERRORFILE, "Failure to exec app initialization process - %s\n",
      strerror(errno));
     return -1;
  }
  mode_t mode = entry->fts_statp->st_mode;
  mode_t new_mode = (mode & (S_IRWXU)) | S_IRGRP | S_IWGRP;
  if ((mode & S_IXUSR) == S_IXUSR) {
    new_mode = new_mode | S_IXGRP;
  }
  if ((mode & S_IFDIR) == S_IFDIR) {
    new_mode = new_mode | S_ISGID;
  }
  if (chmod(entry->fts_path, new_mode) != 0) {
    fprintf(ERRORFILE, "Failure to exec app initialization process - %s\n",
      strerror(errno));
    return -1;
  }
  return 0;
}

int setup_stormdist_dir(const char* local_dir) {
  //This is the same as
  //> chmod g+rwX -R $local_dir
  //> chown -no-dereference -R $user:$supervisor-group $local_dir 

  int exit_code = 0;
  uid_t euser = geteuid();

  if (local_dir == NULL) {
    fprintf(ERRORFILE, "Path is null\n");
    exit_code = UNABLE_TO_BUILD_PATH; // may be malloc failed
  } else {
    char *(paths[]) = {strndup(local_dir,PATH_MAX), 0};
    if (paths[0] == NULL) {
      fprintf(ERRORFILE, "Malloc failed in setup_stormdist_dir\n");
      return -1;
    }
    // check to make sure the directory exists
    if (access(local_dir, F_OK) != 0) {
      if (errno == ENOENT) {
        fprintf(ERRORFILE, "Path does not exist %s\n", local_dir);
        free(paths[0]);
        paths[0] = NULL;
        return UNABLE_TO_BUILD_PATH;
      }
    }
    FTS* tree = fts_open(paths, FTS_PHYSICAL | FTS_XDEV, NULL);
    FTSENT* entry = NULL;
    int ret = 0;

    if (tree == NULL) {
      fprintf(ERRORFILE,
              "Cannot open file traversal structure for the path %s:%s.\n", 
              local_dir, strerror(errno));
      free(paths[0]);
      paths[0] = NULL;
      return -1;
    }

    if (seteuid(0) != 0) {
      fprintf(ERRORFILE, "Could not become root\n");
      return -1;
    }

    while (((entry = fts_read(tree)) != NULL) && exit_code == 0) {
      switch (entry->fts_info) {

      case FTS_DP:        // A directory being visited in post-order
      case FTS_DOT:       // A dot directory
        //NOOP
        fprintf(LOGFILE, "NOOP: %s\n", entry->fts_path); break;
      case FTS_D:         // A directory in pre-order
      case FTS_F:         // A regular file
      case FTS_SL:        // A symbolic link
      case FTS_SLNONE:    // A broken symbolic link
        if (setup_stormdist(entry, euser) != 0) {
          exit_code = -1;
        }
        break;
      case FTS_DEFAULT:   // Unknown type of file
      case FTS_DNR:       // Unreadable directory
      case FTS_NS:        // A file with no stat(2) information
      case FTS_DC:        // A directory that causes a cycle
      case FTS_NSOK:      // No stat information requested
      case FTS_ERR:       // Error return
      default:
        fprintf(LOGFILE, "Unexpected...\n");
        exit_code = -1;
        break;
      }
    }
    ret = fts_close(tree);
    if (exit_code == 0 && ret != 0) {
      fprintf(LOGFILE, "Error in fts_close while setting up %s\n", local_dir);
      exit_code = -1;
    }
    free(paths[0]);
    paths[0] = NULL;
  }
  return exit_code;
}


int signal_container_as_user(const char *user, int pid, int sig) {
  if(pid <= 0) {
    return INVALID_CONTAINER_PID;
  }

  if (change_user(user_detail->pw_uid, user_detail->pw_gid) != 0) {
    return SETUID_OPER_FAILED;
  }

  //Don't continue if the process-group is not alive anymore.
  int has_group = 1;
  if (kill(-pid,0) < 0) {
    if (kill(pid, 0) < 0) {
      if (errno == ESRCH) {
        return INVALID_CONTAINER_PID;
      }
      fprintf(LOGFILE, "Error signalling container %d with %d - %s\n",
	      pid, sig, strerror(errno));
      return -1;
    } else {
      has_group = 0;
    }
  }

  if (kill((has_group ? -1 : 1) * pid, sig) < 0) {
    if(errno != ESRCH) {
      fprintf(LOGFILE, 
              "Error signalling process group %d with signal %d - %s\n", 
              -pid, sig, strerror(errno));
      fprintf(stderr, 
              "Error signalling process group %d with signal %d - %s\n", 
              -pid, sig, strerror(errno));
      fflush(LOGFILE);
      return UNABLE_TO_SIGNAL_CONTAINER;
    } else {
      return INVALID_CONTAINER_PID;
    }
  }
  fprintf(LOGFILE, "Killing process %s%d with %d\n",
	  (has_group ? "group " :""), pid, sig);
  return 0;
}

/**
 * Delete a final directory as the node manager user.
 */
static int rmdir_as_nm(const char* path) {
  int user_uid = geteuid();
  int user_gid = getegid();
  int ret = change_effective_user(launcher_uid, launcher_gid);
  if (ret == 0) {
    if (rmdir(path) != 0) {
      fprintf(LOGFILE, "rmdir of %s failed - %s\n", path, strerror(errno));
      ret = -1;
    }
  }
  // always change back
  if (change_effective_user(user_uid, user_gid) != 0) {
    ret = -1;
  }
  return ret;
}

/**
 * Recursively delete the given path.
 * full_path : the path to delete
 * needs_tt_user: the top level directory must be deleted by the tt user.
 */
static int delete_path(const char *full_path, 
                       int needs_tt_user) {
  int exit_code = 0;

  if (full_path == NULL) {
    fprintf(LOGFILE, "Path is null\n");
    exit_code = UNABLE_TO_BUILD_PATH; // may be malloc failed
  } else {
    char *(paths[]) = {strndup(full_path,PATH_MAX), 0};
    if (paths[0] == NULL) {
      fprintf(LOGFILE, "Malloc failed in delete_path\n");
      return -1;
    }
    // check to make sure the directory exists
    if (access(full_path, F_OK) != 0) {
      if (errno == ENOENT) {
        free(paths[0]);
        paths[0] = NULL;
        return 0;
      }
    }
    FTS* tree = fts_open(paths, FTS_PHYSICAL | FTS_XDEV, NULL);
    FTSENT* entry = NULL;
    int ret = 0;

    if (tree == NULL) {
      fprintf(LOGFILE,
              "Cannot open file traversal structure for the path %s:%s.\n", 
              full_path, strerror(errno));
      free(paths[0]);
      paths[0] = NULL;
      return -1;
    }
    while (((entry = fts_read(tree)) != NULL) && exit_code == 0) {
      switch (entry->fts_info) {

      case FTS_DP:        // A directory being visited in post-order
        if (!needs_tt_user ||
            strcmp(entry->fts_path, full_path) != 0) {
          if (rmdir(entry->fts_accpath) != 0) {
            fprintf(LOGFILE, "Couldn't delete directory %s - %s\n", 
                    entry->fts_path, strerror(errno));
            exit_code = -1;
          }
        }
        break;

      case FTS_F:         // A regular file
      case FTS_SL:        // A symbolic link
      case FTS_SLNONE:    // A broken symbolic link
      case FTS_DEFAULT:   // Unknown type of file
        if (unlink(entry->fts_accpath) != 0) {
          fprintf(LOGFILE, "Couldn't delete file %s - %s\n", entry->fts_path,
                  strerror(errno));
          exit_code = -1;
        }
        break;

      case FTS_DNR:       // Unreadable directory
        fprintf(LOGFILE, "Unreadable directory %s. Skipping..\n", 
                entry->fts_path);
        break;

      case FTS_D:         // A directory in pre-order
        // if the directory isn't readable, chmod it
        if ((entry->fts_statp->st_mode & 0200) == 0) {
          fprintf(LOGFILE, "Unreadable directory %s, chmoding.\n", 
                  entry->fts_path);
          if (chmod(entry->fts_accpath, 0700) != 0) {
            fprintf(LOGFILE, "Error chmoding %s - %s, continuing\n", 
                    entry->fts_path, strerror(errno));
          }
        }
        break;

      case FTS_NS:        // A file with no stat(2) information
        // usually a root directory that doesn't exist
        fprintf(LOGFILE, "Directory not found %s\n", entry->fts_path);
        break;

      case FTS_DC:        // A directory that causes a cycle
      case FTS_DOT:       // A dot directory
      case FTS_NSOK:      // No stat information requested
        break;

      case FTS_ERR:       // Error return
        fprintf(LOGFILE, "Error traversing directory %s - %s\n", 
                entry->fts_path, strerror(entry->fts_errno));
        exit_code = -1;
        break;
      default:
        exit_code = -1;
        break;
      }
    }
    ret = fts_close(tree);
    if (exit_code == 0 && ret != 0) {
      fprintf(LOGFILE, "Error in fts_close while deleting %s\n", full_path);
      exit_code = -1;
    }
    if (needs_tt_user) {
      // If the delete failed, try a final rmdir as root on the top level.
      // That handles the case where the top level directory is in a directory
      // that is owned by the node manager.
      exit_code = rmdir_as_nm(full_path);
    }
    free(paths[0]);
    paths[0] = NULL;
  }
  return exit_code;
}

int exec_as_user(const char * working_dir, const char * script_file) {
  char *script_file_dest = NULL;
  script_file_dest = get_container_launcher_file(working_dir);
  if (script_file_dest == NULL) {
    return OUT_OF_MEMORY;
  }

  // open launch script
  int script_file_source = open_file_as_nm(script_file);
  if (script_file_source == -1) {
    return -1;
  }

  setsid();

  // give up root privs
  if (change_user(user_detail->pw_uid, user_detail->pw_gid) != 0) {
    return SETUID_OPER_FAILED;
  }

  if (copy_file(script_file_source, script_file, script_file_dest, S_IRWXU) != 0) {
    return -1;
  }

  fcloseall();
  umask(0027);
  if (chdir(working_dir) != 0) {
    fprintf(LOGFILE, "Can't change directory to %s -%s\n", working_dir,
	    strerror(errno));
    return -1;
  }

  if (execlp(script_file_dest, script_file_dest, NULL) != 0) {
    fprintf(LOGFILE, "Couldn't execute the container launch file %s - %s", 
            script_file_dest, strerror(errno));
    return UNABLE_TO_EXECUTE_CONTAINER_SCRIPT;
  }
 
  //Unreachable
  return -1;
}

int fork_as_user(const char * working_dir, const char * script_file) {
  char *script_file_dest = NULL;
  script_file_dest = get_container_launcher_file(working_dir);
  if (script_file_dest == NULL) {
    return OUT_OF_MEMORY;
  }

  // open launch script
  int script_file_source = open_file_as_nm(script_file);
  if (script_file_source == -1) {
    return -1;
  }

  setsid();

  // give up root privs
  if (change_user(user_detail->pw_uid, user_detail->pw_gid) != 0) {
    return SETUID_OPER_FAILED;
  }

  if (copy_file(script_file_source, script_file, script_file_dest, S_IRWXU) != 0) {
    return -1;
  }

  fcloseall();
  umask(0027);
  if (chdir(working_dir) != 0) {
    fprintf(LOGFILE, "Can't change directory to %s -%s\n", working_dir,
	    strerror(errno));
    return -1;
  }

  int pid = fork();
  if (pid == 0 && execlp(script_file_dest, script_file_dest, NULL) != 0) {
    fprintf(LOGFILE, "Couldn't execute the container launch file %s - %s",
            script_file_dest, strerror(errno));
    return UNABLE_TO_EXECUTE_CONTAINER_SCRIPT;
  } else {
    fprintf(LOGFILE, "Launched the process from the container launch file %s - with pid %d",
            script_file_dest, pid);
    return 0;
  }

  //Unreachable
  return -1;
}

/**
 * Delete the given directory as the user from each of the directories
 * user: the user doing the delete
 * subdir: the subdir to delete (if baseDirs is empty, this is treated as
           an absolute path)
 * baseDirs: (optional) the baseDirs where the subdir is located
 */
int delete_as_user(const char *user,
                   const char *subdir,
                   char* const* baseDirs) {
  int ret = 0;

  char** ptr;

  // TODO: No switching user? !!!!
  if (baseDirs == NULL || *baseDirs == NULL) {
    return delete_path(subdir, 1);
  }
  // do the delete
  for(ptr = (char**)baseDirs; *ptr != NULL; ++ptr) {
    char* full_path = concatenate("%s/%s", "user subdir", 2,
                              *ptr, subdir);
    if (full_path == NULL) {
      return -1;
    }
    int this_ret = delete_path(full_path, strlen(subdir) == 0);
    free(full_path);
    full_path = NULL;
    // delete as much as we can, but remember the error
    if (this_ret != 0) {
      ret = this_ret;
    }
  }
  return ret;
}