newlib/winsup/cygwin/uinfo.cc

/* uinfo.cc: user info (uid, gid, etc...)

   Copyright 1996, 1997, 1998 Cygnus Solutions.

This file is part of Cygwin.

This software is a copyrighted work licensed under the terms of the
Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
details. */

#include "winsup.h"
#include <pwd.h>
#include <unistd.h>
#include <winnls.h>
#include <wininet.h>
#include <utmp.h>
#include <limits.h>
#include <stdlib.h>
#include <lm.h>
#include <sys/cygwin.h>
#include "sync.h"
#include "sigproc.h"
#include "pinfo.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "registry.h"
#include "security.h"

struct passwd *
internal_getlogin (cygheap_user &user)
{
  char username[UNLEN + 1];
  DWORD ulen = UNLEN + 1;
  struct passwd *pw = NULL;

  if (!GetUserName (username, &ulen))
    user.set_name ("unknown");
  else
    user.set_name (username);

  if (os_being_run == winNT)
    {
      HANDLE ptok = user.token; /* Which is INVALID_HANDLE_VALUE if no
				   impersonation took place. */
      DWORD siz;
      cygsid tu;
      NET_API_STATUS ret = 0;
      char domain[INTERNET_MAX_HOST_NAME_LENGTH + 1];
      DWORD dlen = INTERNET_MAX_HOST_NAME_LENGTH + 1;
      SID_NAME_USE use;
      char buf[MAX_PATH];

      /* Try to get the SID either from already impersonated token
	 or from current process first. To differ that two cases is
	 important, because you can't rely on the user information
	 in a process token of a currently impersonated process. */
      user.set_sid (NO_SID);
      if (ptok == INVALID_HANDLE_VALUE
	  && !OpenProcessToken (GetCurrentProcess (),
				TOKEN_ADJUST_DEFAULT | TOKEN_QUERY,
				&ptok))
	debug_printf ("OpenProcessToken(): %E");
      else if (!GetTokenInformation (ptok, TokenUser, &tu, sizeof tu, &siz))
	debug_printf ("GetTokenInformation(): %E");
      else if (!(ret = user.set_sid (tu)))
	debug_printf ("Couldn't retrieve SID from access token!");
      else if (!LookupAccountSid (NULL, user.sid (), username, &ulen,
				  domain, &dlen, &use))
	debug_printf ("LookupAccountSid (): %E");
      else
	{
	  user.set_name (username);
	  user.set_domain (domain);
	}
      if (get_logon_server_and_user_domain (domain, NULL))
	user.set_logsrv (domain + 2);
      setenv ("USERNAME", user.name (), 1);
      setenv ("LOGONSERVER", user.logsrv (), 1);
      setenv ("USERDOMAIN", user.domain (), 1);

      LPUSER_INFO_3 ui;
      WCHAR wlogsrv[INTERNET_MAX_HOST_NAME_LENGTH + 1];
      WCHAR wuser[UNLEN + 1];
      sys_mbstowcs (wlogsrv, user.logsrv (), INTERNET_MAX_HOST_NAME_LENGTH + 1);
      sys_mbstowcs (wuser, user.name (), UNLEN + 1);
      if (!NetUserGetInfo (wlogsrv, wuser, 3, (LPBYTE *)&ui) ||
          !NetUserGetInfo (NULL, wuser, 3, (LPBYTE *)&ui))
	{
	  sys_wcstombs (buf, ui->usri3_home_dir, MAX_PATH);
	  if (!buf[0])
	    {
	      sys_wcstombs (buf, ui->usri3_home_dir_drive, MAX_PATH);
	      if (buf[0])
		strcat (buf, "\\");
	      else
		{
		  char *env = getenv ("SYSTEMDRIVE");
		  if (env && *env)
		    strcat (strcpy (buf, env), "\\");
		  else
		    GetSystemDirectoryA (buf, MAX_PATH);
		}
	    }
	  setenv ("HOMEPATH", buf + 2, 1);
	  buf[2] = '\0';
	  setenv ("HOMEDRIVE", buf, 1);
	  NetApiBufferFree (ui);
	}

      /* If we have a SID, try to get the corresponding Cygwin user name
	 which can be different from the Windows user name. */
      cygsid gsid (NO_SID);
      if (user.sid ())
	{
	  cygsid psid;

	  for (int pidx = 0; (pw = internal_getpwent (pidx)); ++pidx)
	    if (psid.getfrompw (pw) && EqualSid (user.sid (), psid))
	      {
		user.set_name (pw->pw_name);
		struct group *gr = getgrgid (pw->pw_gid);
		if (gr && !gsid.getfromgr (gr))
		  gsid = NO_SID;
	      }
	  if (!strcasematch (user.name (), "SYSTEM"))
	    if (get_registry_hive_path (user.sid (), buf))
	      setenv ("USERPROFILE", buf, 1);
	    else
	      unsetenv ("USERPROFILE");
	}

      /* If this process is started from a non Cygwin process,
	 set token owner to the same value as token user and
	 primary group to the group which is set as primary group
	 in /etc/passwd. */
      if (ptok != INVALID_HANDLE_VALUE && myself->ppid == 1)
	{
	  if (!SetTokenInformation (ptok, TokenOwner, &tu, sizeof tu))
	    debug_printf ("SetTokenInformation(TokenOwner): %E");
	  if (gsid && !SetTokenInformation (ptok, TokenPrimaryGroup,
					    &gsid, sizeof gsid))
	    debug_printf ("SetTokenInformation(TokenPrimaryGroup): %E");
	}

      /* Close token only if it's a result from OpenProcessToken(). */
      if (ptok != INVALID_HANDLE_VALUE
	  && user.token == INVALID_HANDLE_VALUE)
	CloseHandle (ptok);
    }
  debug_printf ("Cygwins Username: %s", user.name ());
  return pw ?: getpwnam(user.name ());
}

void
uinfo_init ()
{
  struct passwd *p;

  /* Initialize to non impersonated values.
     Setting `impersonated' to TRUE seems to be wrong but it
     isn't. Impersonated is thought as "Current User and `token'
     are coincident". See seteuid() for the mechanism behind that. */
  cygheap->user.token = INVALID_HANDLE_VALUE;
  cygheap->user.impersonated = TRUE;

  /* If uid is USHRT_MAX, the process is started from a non cygwin
     process or the user context was changed in spawn.cc */
  if (myself->uid == USHRT_MAX)
    if ((p = internal_getlogin (cygheap->user)) != NULL)
      {
	myself->uid = p->pw_uid;
	/* Set primary group only if ntsec is off or the process has been
	   started from a non cygwin process. */
	if (!allow_ntsec || myself->ppid == 1)
	  myself->gid = p->pw_gid;
      }
    else
      {
	myself->uid = DEFAULT_UID;
	myself->gid = DEFAULT_GID;
      }
  /* Real and effective uid/gid are always identical on process start up.
     This is at least true for NT/W2K. */
  cygheap->user.orig_uid = cygheap->user.real_uid = myself->uid;
  cygheap->user.orig_gid = cygheap->user.real_gid = myself->gid;
}

extern "C" char *
getlogin (void)
{
#ifdef _MT_SAFE
  char *this_username=_reent_winsup ()->_username;
#else
  static NO_COPY char this_username[UNLEN + 1];
#endif

  return strcpy (this_username, cygheap->user.name ());
}

extern "C" uid_t
getuid (void)
{
  return cygheap->user.real_uid;
}

extern "C" gid_t
getgid (void)
{
  return cygheap->user.real_gid;
}

extern "C" uid_t
geteuid (void)
{
  return myself->uid;
}

extern "C" gid_t
getegid (void)
{
  return myself->gid;
}

/* Not quite right - cuserid can change, getlogin can't */
extern "C" char *
cuserid (char *src)
{
  if (src)
    {
      strcpy (src, getlogin ());
      return src;
    }
  else
    {
      return getlogin ();
    }
}