text: /*
   * Copyright (c) 2006 Darren Tucker.  All rights reserved.
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include "includes.h"
  
  #include <stdarg.h>
  #include <stdio.h>
  #include <unistd.h>
  
  #include "log.h"
  #include "misc.h"
  #include "servconf.h"
  #include "sshkey.h"
  #include "hostfile.h"
  #include "auth.h"
  #include "auth-pam.h"
  #include "platform.h"
  
  #include "openbsd-compat/openbsd-compat.h"
  
  extern int use_privsep;
  extern ServerOptions options;
  
  void
  platform_pre_listen(void)
  {
  #ifdef LINUX_OOM_ADJUST
  	/* Adjust out-of-memory killer so listening process is not killed */
  	oom_adjust_setup();
  #endif
  }
  
  void
  platform_pre_fork(void)
  {
  #ifdef USE_SOLARIS_PROCESS_CONTRACTS
  	solaris_contract_pre_fork();
  #endif
  }
  
  void
  platform_pre_restart(void)
  {
  #ifdef LINUX_OOM_ADJUST
  	oom_adjust_restore();
  #endif
  }
  
  void
  platform_post_fork_parent(pid_t child_pid)
  {
  #ifdef USE_SOLARIS_PROCESS_CONTRACTS
  	solaris_contract_post_fork_parent(child_pid);
  #endif
  }
  
  void
  platform_post_fork_child(void)
  {
  #ifdef USE_SOLARIS_PROCESS_CONTRACTS
  	solaris_contract_post_fork_child();
  #endif
  #ifdef LINUX_OOM_ADJUST
  	oom_adjust_restore();
  #endif
  }
  
  /* return 1 if we are running with privilege to swap UIDs, 0 otherwise */
  int
  platform_privileged_uidswap(void)
  {
  #ifdef HAVE_CYGWIN
  	/* uid 0 is not special on Cygwin so always try */
  	return 1;
  #else
  	return (getuid() == 0 || geteuid() == 0);
  #endif
  }
  
  /*
   * This gets called before switching UIDs, and is called even when sshd is
   * not running as root.
   */
  void
  platform_setusercontext(struct passwd *pw)
  {
  #ifdef WITH_SELINUX
  	/* Cache selinux status for later use */
  	(void)ssh_selinux_enabled();
  #endif
  
  #ifdef USE_SOLARIS_PROJECTS
  	/*
  	 * If solaris projects were detected, set the default now, unless
  	 * we are using PAM in which case it is the responsibility of the
  	 * PAM stack.
  	 */
  	if (!options.use_pam && (getuid() == 0 || geteuid() == 0))
  		solaris_set_default_project(pw);
  #endif
  
  #if defined(HAVE_LOGIN_CAP) && defined (__bsdi__)
  	if (getuid() == 0 || geteuid() == 0)
  		setpgid(0, 0);
  # endif
  
  #if defined(HAVE_LOGIN_CAP) && defined(USE_PAM)
  	/*
  	 * If we have both LOGIN_CAP and PAM, we want to establish creds
  	 * before calling setusercontext (in session.c:do_setusercontext).
  	 */
  	if (getuid() == 0 || geteuid() == 0) {
  		if (options.use_pam) {
  			do_pam_setcred(use_privsep);
  		}
  	}
  # endif /* USE_PAM */
  
  #if !defined(HAVE_LOGIN_CAP) && defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
  	if (getuid() == 0 || geteuid() == 0) {
  		/* Sets login uid for accounting */
  		if (getluid() == -1 && setluid(pw->pw_uid) == -1)
  			error("setluid: %s", strerror(errno));
  	}
  #endif
  }
  
  /*
   * This gets called after we've established the user's groups, and is only
   * called if sshd is running as root.
   */
  void
  platform_setusercontext_post_groups(struct passwd *pw)
  {
  #if !defined(HAVE_LOGIN_CAP) && defined(USE_PAM)
  	/*
  	 * PAM credentials may take the form of supplementary groups.
  	 * These will have been wiped by the above initgroups() call.
  	 * Reestablish them here.
  	 */
  	if (options.use_pam) {
  		do_pam_setcred(use_privsep);
  	}
  #endif /* USE_PAM */
  
  #if !defined(HAVE_LOGIN_CAP) && (defined(WITH_IRIX_PROJECT) || \
      defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY))
  	irix_setusercontext(pw);
  #endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
  
  #ifdef _AIX
  	aix_usrinfo(pw);
  #endif /* _AIX */
  
  #ifdef HAVE_SETPCRED
  	/*
  	 * If we have a chroot directory, we set all creds except real
  	 * uid which we will need for chroot.  If we don't have a
  	 * chroot directory, we don't override anything.
  	 */
  	{
  		char **creds = NULL, *chroot_creds[] =
  		    { "REAL_USER=root", NULL };
  
  		if (options.chroot_directory != NULL &&
  		    strcasecmp(options.chroot_directory, "none") != 0)
  			creds = chroot_creds;
  
  		if (setpcred(pw->pw_name, creds) == -1)
  			fatal("Failed to set process credentials");
  	}
  #endif /* HAVE_SETPCRED */
  #ifdef WITH_SELINUX
  	ssh_selinux_setup_exec_context(pw->pw_name);
  #endif
  }
  
  char *
  platform_krb5_get_principal_name(const char *pw_name)
  {
  #ifdef USE_AIX_KRB_NAME
  	return aix_krb5_get_principal_name(pw_name);
  #else
  	return NULL;
  #endif
  }
  