561 lines
13 KiB
C++
561 lines
13 KiB
C++
/* uinfo.cc: user info (uid, gid, etc...)
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Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <pwd.h>
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#include <unistd.h>
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#include <winnls.h>
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#include <wininet.h>
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#include <utmp.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <lm.h>
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#include <sys/cygwin.h>
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#include "pinfo.h"
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#include "security.h"
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#include "path.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "cygerrno.h"
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#include "cygheap.h"
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#include "registry.h"
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#include "child_info.h"
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#include "environ.h"
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#include "pwdgrp.h"
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/* Initialize the part of cygheap_user that does not depend on files.
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The information is used in shared.cc for the user shared.
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Final initialization occurs in uinfo_init */
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void
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cygheap_user::init ()
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{
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char user_name[UNLEN + 1];
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DWORD user_name_len = UNLEN + 1;
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set_name (GetUserName (user_name, &user_name_len) ? user_name : "unknown");
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if (!wincap.has_security ())
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return;
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HANDLE ptok;
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DWORD siz;
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char pdacl_buf [sizeof (PTOKEN_DEFAULT_DACL) + ACL_DEFAULT_SIZE];
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PTOKEN_DEFAULT_DACL pdacl = (PTOKEN_DEFAULT_DACL) pdacl_buf;
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if (!OpenProcessToken (hMainProc, TOKEN_ADJUST_DEFAULT | TOKEN_QUERY,
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&ptok))
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{
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system_printf ("OpenProcessToken(): %E");
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return;
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}
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if (!GetTokenInformation (ptok, TokenPrimaryGroup,
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&groups.pgsid, sizeof (cygsid), &siz))
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system_printf ("GetTokenInformation (TokenPrimaryGroup): %E");
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/* Get the SID from current process and store it in effec_cygsid */
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if (!GetTokenInformation (ptok, TokenUser, &effec_cygsid, sizeof (cygsid), &siz))
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{
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system_printf ("GetTokenInformation (TokenUser): %E");
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goto out;
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}
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/* Set token owner to the same value as token user */
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if (!SetTokenInformation (ptok, TokenOwner, &effec_cygsid, sizeof (cygsid)))
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debug_printf ("SetTokenInformation(TokenOwner): %E");
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/* Add the user in the default DACL if needed */
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if (!GetTokenInformation (ptok, TokenDefaultDacl, pdacl, sizeof (pdacl_buf), &siz))
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system_printf ("GetTokenInformation (TokenDefaultDacl): %E");
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else if (pdacl->DefaultDacl) /* Running with security */
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{
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PACL pAcl = pdacl->DefaultDacl;
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PACCESS_ALLOWED_ACE pAce;
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for (int i = 0; i < pAcl->AceCount; i++)
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{
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if (!GetAce (pAcl, i, (LPVOID *) &pAce))
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system_printf ("GetAce: %E");
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else if (pAce->Header.AceType == ACCESS_ALLOWED_ACE_TYPE
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&& effec_cygsid == &pAce->SidStart)
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goto out;
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}
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pAcl->AclSize = &pdacl_buf[sizeof (pdacl_buf)] - (char *) pAcl;
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if (!AddAccessAllowedAce (pAcl, ACL_REVISION, GENERIC_ALL, effec_cygsid))
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system_printf ("AddAccessAllowedAce: %E");
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else if (FindFirstFreeAce (pAcl, (LPVOID *) &pAce), !(pAce))
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debug_printf ("FindFirstFreeAce %E");
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else
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{
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pAcl->AclSize = (char *) pAce - (char *) pAcl;
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if (!SetTokenInformation (ptok, TokenDefaultDacl, pdacl, sizeof (* pdacl)))
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system_printf ("SetTokenInformation (TokenDefaultDacl): %E");
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}
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}
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out:
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CloseHandle (ptok);
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}
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void
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internal_getlogin (cygheap_user &user)
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{
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struct passwd *pw = NULL;
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if (wincap.has_security ())
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{
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cygpsid psid = user.sid ();
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pw = internal_getpwsid (psid);
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}
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if (!pw && !(pw = internal_getpwnam (user.name ()))
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&& !(pw = internal_getpwuid (DEFAULT_UID)))
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debug_printf ("user not found in augmented /etc/passwd");
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else
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{
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myself->uid = pw->pw_uid;
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myself->gid = pw->pw_gid;
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user.set_name (pw->pw_name);
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if (wincap.has_security ())
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{
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cygsid gsid;
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if (gsid.getfromgr (internal_getgrgid (pw->pw_gid)))
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{
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HANDLE ptok;
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if (gsid != user.groups.pgsid
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&& OpenProcessToken (hMainProc, TOKEN_ADJUST_DEFAULT, &ptok))
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{
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/* Set primary group to the group in /etc/passwd. */
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if (!SetTokenInformation (ptok, TokenPrimaryGroup,
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&gsid, sizeof gsid))
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debug_printf ("SetTokenInformation(TokenPrimaryGroup): %E");
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else
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user.groups.pgsid = gsid;
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CloseHandle (ptok);
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}
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}
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else
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debug_printf ("gsid not found in augmented /etc/group");
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}
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}
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(void) cygheap->user.ontherange (CH_HOME, pw);
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return;
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}
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void
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uinfo_init ()
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{
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if (child_proc_info && !cygheap->user.has_impersonation_tokens ())
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return;
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if (!child_proc_info)
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internal_getlogin (cygheap->user); /* Set the cygheap->user. */
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/* Conditions must match those in spawn to allow starting child
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processes with ruid != euid and rgid != egid. */
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else if (cygheap->user.issetuid ()
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&& cygheap->user.saved_uid == cygheap->user.real_uid
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&& cygheap->user.saved_gid == cygheap->user.real_gid
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&& !cygheap->user.groups.issetgroups ())
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{
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cygheap->user.reimpersonate ();
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return;
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}
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else
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cygheap->user.close_impersonation_tokens ();
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cygheap->user.saved_uid = cygheap->user.real_uid = myself->uid;
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cygheap->user.saved_gid = cygheap->user.real_gid = myself->gid;
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cygheap->user.external_token = INVALID_HANDLE_VALUE;
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cygheap->user.internal_token = INVALID_HANDLE_VALUE;
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cygheap->user.current_token = INVALID_HANDLE_VALUE;
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cygheap->user.set_saved_sid (); /* Update the original sid */
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}
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extern "C" char *
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getlogin (void)
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{
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#ifdef _MT_SAFE
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char *this_username=_reent_winsup ()->_username;
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#else
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static char this_username[UNLEN + 1] NO_COPY;
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#endif
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return strcpy (this_username, cygheap->user.name ());
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}
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extern "C" __uid32_t
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getuid32 (void)
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{
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return cygheap->user.real_uid;
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}
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extern "C" __uid16_t
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getuid (void)
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{
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return cygheap->user.real_uid;
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}
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extern "C" __gid32_t
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getgid32 (void)
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{
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return cygheap->user.real_gid;
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}
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extern "C" __gid16_t
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getgid (void)
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{
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return cygheap->user.real_gid;
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}
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extern "C" __uid32_t
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geteuid32 (void)
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{
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return myself->uid;
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}
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extern "C" __uid16_t
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geteuid (void)
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{
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return myself->uid;
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}
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extern "C" __gid32_t
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getegid32 (void)
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{
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return myself->gid;
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}
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extern "C" __gid16_t
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getegid (void)
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{
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return myself->gid;
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}
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/* Not quite right - cuserid can change, getlogin can't */
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extern "C" char *
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cuserid (char *src)
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{
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if (!src)
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return getlogin ();
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strcpy (src, getlogin ());
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return src;
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}
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const char *
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cygheap_user::ontherange (homebodies what, struct passwd *pw)
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{
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LPUSER_INFO_3 ui = NULL;
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WCHAR wuser[UNLEN + 1];
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NET_API_STATUS ret;
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char homepath_env_buf[CYG_MAX_PATH + 1];
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char homedrive_env_buf[3];
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char *newhomedrive = NULL;
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char *newhomepath = NULL;
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debug_printf ("what %d, pw %p", what, pw);
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if (what == CH_HOME)
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{
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char *p;
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if (homedrive)
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newhomedrive = homedrive;
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else if ((p = getenv ("HOMEDRIVE")))
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newhomedrive = p;
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if (homepath)
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newhomepath = homepath;
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else if ((p = getenv ("HOMEPATH")))
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newhomepath = p;
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if ((p = getenv ("HOME")))
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debug_printf ("HOME is already in the environment %s", p);
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else
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{
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if (pw && pw->pw_dir && *pw->pw_dir)
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{
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debug_printf ("Set HOME (from /etc/passwd) to %s", pw->pw_dir);
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setenv ("HOME", pw->pw_dir, 1);
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}
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else if (!newhomedrive || !newhomepath)
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setenv ("HOME", "/", 1);
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else
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{
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char home[CYG_MAX_PATH];
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char buf[CYG_MAX_PATH + 1];
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strcpy (buf, newhomedrive);
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strcat (buf, newhomepath);
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cygwin_conv_to_full_posix_path (buf, home);
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debug_printf ("Set HOME (from HOMEDRIVE/HOMEPATH) to %s", home);
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setenv ("HOME", home, 1);
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}
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}
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}
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if (what != CH_HOME && homepath == NULL && newhomepath == NULL)
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{
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if (!pw)
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pw = internal_getpwnam (name ());
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if (pw && pw->pw_dir && *pw->pw_dir)
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cygwin_conv_to_full_win32_path (pw->pw_dir, homepath_env_buf);
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else
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{
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homepath_env_buf[0] = homepath_env_buf[1] = '\0';
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if (logsrv ())
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{
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WCHAR wlogsrv[INTERNET_MAX_HOST_NAME_LENGTH + 3];
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sys_mbstowcs (wlogsrv, logsrv (),
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sizeof (wlogsrv) / sizeof (*wlogsrv));
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sys_mbstowcs (wuser, winname (), sizeof (wuser) / sizeof (*wuser));
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if (!(ret = NetUserGetInfo (wlogsrv, wuser, 3, (LPBYTE *) &ui)))
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{
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sys_wcstombs (homepath_env_buf, ui->usri3_home_dir, CYG_MAX_PATH);
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if (!homepath_env_buf[0])
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{
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sys_wcstombs (homepath_env_buf, ui->usri3_home_dir_drive,
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CYG_MAX_PATH);
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if (homepath_env_buf[0])
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strcat (homepath_env_buf, "\\");
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else
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cygwin_conv_to_full_win32_path ("/", homepath_env_buf);
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}
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}
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}
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if (ui)
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NetApiBufferFree (ui);
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}
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if (homepath_env_buf[1] != ':')
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{
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newhomedrive = almost_null;
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newhomepath = homepath_env_buf;
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}
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else
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{
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homedrive_env_buf[0] = homepath_env_buf[0];
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homedrive_env_buf[1] = homepath_env_buf[1];
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homedrive_env_buf[2] = '\0';
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newhomedrive = homedrive_env_buf;
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newhomepath = homepath_env_buf + 2;
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}
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}
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if (newhomedrive && newhomedrive != homedrive)
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cfree_and_set (homedrive, (newhomedrive == almost_null)
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? almost_null : cstrdup (newhomedrive));
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if (newhomepath && newhomepath != homepath)
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cfree_and_set (homepath, cstrdup (newhomepath));
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switch (what)
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{
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case CH_HOMEDRIVE:
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return homedrive;
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case CH_HOMEPATH:
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return homepath;
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default:
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return homepath;
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}
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}
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const char *
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cygheap_user::test_uid (char *&what, const char *name, size_t namelen)
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{
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if (!what && !issetuid ())
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what = getwinenveq (name, namelen, HEAP_STR);
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return what;
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}
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const char *
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cygheap_user::env_logsrv (const char *name, size_t namelen)
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{
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if (test_uid (plogsrv, name, namelen))
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return plogsrv;
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const char *mydomain = domain ();
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const char *myname = winname ();
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if (!mydomain || strcasematch (myname, "SYSTEM"))
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return almost_null;
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char logsrv[INTERNET_MAX_HOST_NAME_LENGTH + 3];
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cfree_and_set (plogsrv, almost_null);
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if (get_logon_server (mydomain, logsrv, NULL))
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plogsrv = cstrdup (logsrv);
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return plogsrv;
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}
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const char *
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cygheap_user::env_domain (const char *name, size_t namelen)
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{
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if (pwinname && test_uid (pdomain, name, namelen))
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return pdomain;
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char username[UNLEN + 1];
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DWORD ulen = sizeof (username);
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char userdomain[DNLEN + 1];
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DWORD dlen = sizeof (userdomain);
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SID_NAME_USE use;
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cfree_and_set (pwinname, almost_null);
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cfree_and_set (pdomain, almost_null);
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if (!LookupAccountSid (NULL, sid (), username, &ulen,
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userdomain, &dlen, &use))
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__seterrno ();
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else
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{
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pwinname = cstrdup (username);
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pdomain = cstrdup (userdomain);
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}
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return pdomain;
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}
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const char *
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cygheap_user::env_userprofile (const char *name, size_t namelen)
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{
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if (test_uid (puserprof, name, namelen))
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return puserprof;
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char userprofile_env_buf[CYG_MAX_PATH + 1];
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cfree_and_set (puserprof, almost_null);
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/* FIXME: Should this just be setting a puserprofile like everything else? */
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const char *myname = winname ();
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if (myname && strcasematch (myname, "SYSTEM")
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&& get_registry_hive_path (sid (), userprofile_env_buf))
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puserprof = cstrdup (userprofile_env_buf);
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return puserprof;
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}
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const char *
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cygheap_user::env_homepath (const char *name, size_t namelen)
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{
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return ontherange (CH_HOMEPATH);
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}
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const char *
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cygheap_user::env_homedrive (const char *name, size_t namelen)
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{
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return ontherange (CH_HOMEDRIVE);
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}
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const char *
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cygheap_user::env_name (const char *name, size_t namelen)
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{
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if (!test_uid (pwinname, name, namelen))
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(void) domain ();
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return pwinname;
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}
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char *
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pwdgrp::next_str (char c)
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{
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char *res = lptr;
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lptr = strechr (lptr, c);
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if (*lptr)
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*lptr++ = '\0';
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return res;
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}
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bool
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pwdgrp::next_num (unsigned long& n)
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{
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char *p = next_str (':');
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char *cp;
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n = strtoul (p, &cp, 10);
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return p != cp && !*cp;
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}
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char *
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pwdgrp::add_line (char *eptr)
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{
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if (eptr)
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{
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lptr = eptr;
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eptr = strchr (lptr, '\n');
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if (eptr)
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{
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if (eptr > lptr && eptr[-1] == '\r')
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eptr[-1] = '\0';
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else
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*eptr = '\0';
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eptr++;
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}
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if (curr_lines >= max_lines)
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{
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max_lines += 10;
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*pwdgrp_buf = realloc (*pwdgrp_buf, max_lines * pwdgrp_buf_elem_size);
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}
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if ((this->*parse) ())
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curr_lines++;
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}
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return eptr;
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}
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void
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pwdgrp::load (const char *posix_fname)
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{
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const char *res;
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static const char failed[] = "failed";
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static const char succeeded[] = "succeeded";
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if (buf)
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free (buf);
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buf = NULL;
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curr_lines = 0;
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pc.check (posix_fname);
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etc_ix = etc::init (etc_ix, pc);
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paranoid_printf ("%s", posix_fname);
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if (pc.error || !pc.exists () || !pc.isdisk () || pc.isdir ())
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{
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paranoid_printf ("strange path_conv problem");
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res = failed;
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}
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else
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{
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HANDLE fh = CreateFile (pc, GENERIC_READ, wincap.shared (), NULL,
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|
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
|
|
if (fh == INVALID_HANDLE_VALUE)
|
|
{
|
|
paranoid_printf ("%s CreateFile failed, %E");
|
|
res = failed;
|
|
}
|
|
else
|
|
{
|
|
DWORD size = GetFileSize (fh, NULL), read_bytes;
|
|
buf = (char *) malloc (size + 1);
|
|
if (!ReadFile (fh, buf, size, &read_bytes, NULL))
|
|
{
|
|
paranoid_printf ("ReadFile failed, %E");
|
|
CloseHandle (fh);
|
|
if (buf)
|
|
free (buf);
|
|
buf = NULL;
|
|
res = failed;
|
|
}
|
|
else
|
|
{
|
|
CloseHandle (fh);
|
|
buf[read_bytes] = '\0';
|
|
char *eptr = buf;
|
|
while ((eptr = add_line (eptr)))
|
|
continue;
|
|
debug_printf ("%s curr_lines %d", posix_fname, curr_lines);
|
|
res = succeeded;
|
|
}
|
|
}
|
|
}
|
|
|
|
debug_printf ("%s load %s", posix_fname, res);
|
|
initialized = true;
|
|
return;
|
|
}
|