static bool checkuser()

in src/native/unix/native/jsvc-unix.c [419:470]

• 36 lines of code
• 9 McCabe index (conditional complexity)

static bool checkuser(char *user, uid_t * uid, gid_t * gid)
{
    struct passwd *pwds = NULL;
    int status = 0;
    pid_t pid = 0;

    /* Do we actually _have_ to switch user? */
    if (user == NULL)
        return true;

    pwds = getpwnam(user);
    if (pwds == NULL) {
        log_error("Invalid user name '%s' specified", user);
        return false;
    }

    *uid = pwds->pw_uid;
    *gid = pwds->pw_gid;

    /* Validate the user name in another process */
    pid = fork();
    if (pid == -1) {
        log_error("Cannot validate user name");
        return false;
    }

    /* If we're in the child process, let's validate */
    if (pid == 0) {
        if (set_user_group(user, *uid, *gid) != 0)
            exit(1);
        /* If we got here we switched user/group */
        exit(0);
    }

    while (waitpid(pid, &status, 0) != pid) {
        /* Just wait */
    }

    /* The child must have exited cleanly */
    if (WIFEXITED(status)) {
        status = WEXITSTATUS(status);

        /* If the child got out with 0 the user is ok */
        if (status == 0) {
            log_debug("User '%s' validated", user);
            return true;
        }
    }

    log_error("Error validating user '%s'", user);
    return false;
}