550 lines
13 KiB
C++
550 lines
13 KiB
C++
/* grp.cc
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Copyright 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
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2007, 2008, 2009, 2011, 2012 Red Hat, Inc.
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Original stubs by Jason Molenda of Cygnus Support, crash@cygnus.com
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First implementation by Gunther Ebert, gunther.ebert@ixos-leipzig.de
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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 <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "cygerrno.h"
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#include "pinfo.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 "cygheap.h"
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#include "ntdll.h"
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#include "pwdgrp.h"
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static __group32 *group_buf;
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static pwdgrp gr (group_buf);
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static char * NO_COPY null_ptr;
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bool
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pwdgrp::parse_group ()
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{
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__group32 &grp = (*group_buf)[curr_lines];
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grp.gr_name = next_str (':');
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if (!*grp.gr_name)
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return false;
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grp.gr_passwd = next_str (':');
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if (!next_num (grp.gr_gid))
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return false;
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int n;
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char *dp = raw_ptr ();
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for (n = 0; *next_str (','); n++)
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continue;
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grp.gr_mem = &null_ptr;
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if (n)
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{
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char **namearray = (char **) calloc (n + 1, sizeof (char *));
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if (namearray)
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{
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for (int i = 0; i < n; i++, dp = strchr (dp, '\0') + 1)
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namearray[i] = dp;
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grp.gr_mem = namearray;
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}
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}
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return true;
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}
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/* Cygwin internal */
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/* Read in /etc/group and save contents in the group cache */
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/* This sets group_in_memory_p to 1 so functions in this file can
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tell that /etc/group has been read in */
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void
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pwdgrp::read_group ()
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{
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for (int i = 0; i < gr.curr_lines; i++)
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if ((*group_buf)[i].gr_mem != &null_ptr)
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free ((*group_buf)[i].gr_mem);
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load (L"\\etc\\group");
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/* Complete /etc/group in memory if needed */
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if (!internal_getgrgid (myself->gid))
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{
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static char linebuf [200];
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char group_name [UNLEN + 1] = "mkgroup";
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char strbuf[128] = "";
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struct __group32 *gr;
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cygheap->user.groups.pgsid.string (strbuf);
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if ((gr = internal_getgrsid (cygheap->user.groups.pgsid)))
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snprintf (group_name, sizeof (group_name),
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"passwd/group_GID_clash(%lu/%lu)", myself->gid, gr->gr_gid);
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if (myself->uid == UNKNOWN_UID)
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strcpy (group_name, "mkpasswd"); /* Feedback... */
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snprintf (linebuf, sizeof (linebuf), "%s:%s:%lu:%s",
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group_name, strbuf, myself->gid, cygheap->user.name ());
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debug_printf ("Completing /etc/group: %s", linebuf);
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add_line (linebuf);
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}
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static char NO_COPY pretty_ls[] = "????????::-1:";
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add_line (pretty_ls);
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}
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muto NO_COPY pwdgrp::pglock;
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pwdgrp::pwdgrp (passwd *&pbuf) :
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pwdgrp_buf_elem_size (sizeof (*pbuf)), passwd_buf (&pbuf)
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{
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read = &pwdgrp::read_passwd;
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parse = &pwdgrp::parse_passwd;
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pglock.init ("pglock");
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}
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pwdgrp::pwdgrp (__group32 *&gbuf) :
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pwdgrp_buf_elem_size (sizeof (*gbuf)), group_buf (&gbuf)
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{
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read = &pwdgrp::read_group;
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parse = &pwdgrp::parse_group;
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pglock.init ("pglock");
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}
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struct __group32 *
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internal_getgrsid (cygpsid &sid)
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{
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char sid_string[128];
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gr.refresh (false);
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if (sid.string (sid_string))
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for (int i = 0; i < gr.curr_lines; i++)
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if (!strcmp (sid_string, group_buf[i].gr_passwd))
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return group_buf + i;
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return NULL;
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}
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struct __group32 *
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internal_getgrgid (__gid32_t gid, bool check)
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{
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gr.refresh (check);
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for (int i = 0; i < gr.curr_lines; i++)
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if (group_buf[i].gr_gid == gid)
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return group_buf + i;
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return NULL;
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}
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struct __group32 *
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internal_getgrnam (const char *name, bool check)
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{
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gr.refresh (check);
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for (int i = 0; i < gr.curr_lines; i++)
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if (strcasematch (group_buf[i].gr_name, name))
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return group_buf + i;
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/* Didn't find requested group */
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return NULL;
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}
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static struct __group16 *
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grp32togrp16 (struct __group16 *gp16, struct __group32 *gp32)
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{
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if (!gp16 || !gp32)
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return NULL;
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/* Copying the pointers is actually unnecessary. Just having the correct
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return type is important. */
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gp16->gr_name = gp32->gr_name;
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gp16->gr_passwd = gp32->gr_passwd;
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gp16->gr_gid = (__gid16_t) gp32->gr_gid; /* Not loss-free */
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gp16->gr_mem = gp32->gr_mem;
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return gp16;
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}
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extern "C" int
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getgrgid_r (__gid32_t gid, struct __group32 *grp, char *buffer, size_t bufsize,
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struct __group32 **result)
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{
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*result = NULL;
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if (!grp || !buffer)
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return ERANGE;
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struct __group32 *tempgr = internal_getgrgid (gid, true);
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pthread_testcancel ();
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if (!tempgr)
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return 0;
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/* check needed buffer size. */
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int i;
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size_t needsize = strlen (tempgr->gr_name) + strlen (tempgr->gr_passwd)
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+ 2 + sizeof (char *);
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for (i = 0; tempgr->gr_mem[i]; ++i)
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needsize += strlen (tempgr->gr_mem[i]) + 1 + sizeof (char *);
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if (needsize > bufsize)
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return ERANGE;
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/* make a copy of tempgr */
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*result = grp;
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grp->gr_gid = tempgr->gr_gid;
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buffer = stpcpy (grp->gr_name = buffer, tempgr->gr_name);
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buffer = stpcpy (grp->gr_passwd = buffer + 1, tempgr->gr_passwd);
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grp->gr_mem = (char **) (buffer + 1);
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buffer = (char *) grp->gr_mem + (i + 1) * sizeof (char *);
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for (i = 0; tempgr->gr_mem[i]; ++i)
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buffer = stpcpy (grp->gr_mem[i] = buffer, tempgr->gr_mem[i]) + 1;
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grp->gr_mem[i] = NULL;
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return 0;
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}
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extern "C" struct __group32 *
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getgrgid32 (__gid32_t gid)
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{
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return internal_getgrgid (gid, true);
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}
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extern "C" struct __group16 *
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getgrgid (__gid16_t gid)
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{
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static struct __group16 g16; /* FIXME: thread-safe? */
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return grp32togrp16 (&g16, getgrgid32 (gid16togid32 (gid)));
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}
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extern "C" int
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getgrnam_r (const char *nam, struct __group32 *grp, char *buffer,
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size_t bufsize, struct __group32 **result)
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{
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*result = NULL;
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if (!grp || !buffer)
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return ERANGE;
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struct __group32 *tempgr = internal_getgrnam (nam, true);
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pthread_testcancel ();
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if (!tempgr)
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return 0;
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/* check needed buffer size. */
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int i;
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size_t needsize = strlen (tempgr->gr_name) + strlen (tempgr->gr_passwd)
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+ 2 + sizeof (char *);
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for (i = 0; tempgr->gr_mem[i]; ++i)
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needsize += strlen (tempgr->gr_mem[i]) + 1 + sizeof (char *);
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if (needsize > bufsize)
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return ERANGE;
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/* make a copy of tempgr */
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*result = grp;
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grp->gr_gid = tempgr->gr_gid;
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buffer = stpcpy (grp->gr_name = buffer, tempgr->gr_name);
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buffer = stpcpy (grp->gr_passwd = buffer + 1, tempgr->gr_passwd);
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grp->gr_mem = (char **) (buffer + 1);
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buffer = (char *) grp->gr_mem + (i + 1) * sizeof (char *);
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for (i = 0; tempgr->gr_mem[i]; ++i)
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buffer = stpcpy (grp->gr_mem[i] = buffer, tempgr->gr_mem[i]) + 1;
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grp->gr_mem[i] = NULL;
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return 0;
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}
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extern "C" struct __group32 *
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getgrnam32 (const char *name)
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{
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return internal_getgrnam (name, true);
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}
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extern "C" struct __group16 *
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getgrnam (const char *name)
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{
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static struct __group16 g16; /* FIXME: thread-safe? */
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return grp32togrp16 (&g16, getgrnam32 (name));
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}
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extern "C" void
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endgrent ()
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{
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_my_tls.locals.grp_pos = 0;
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}
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extern "C" struct __group32 *
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getgrent32 ()
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{
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if (_my_tls.locals.grp_pos == 0)
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gr.refresh (true);
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if (_my_tls.locals.grp_pos < gr.curr_lines)
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return group_buf + _my_tls.locals.grp_pos++;
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return NULL;
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}
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extern "C" struct __group16 *
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getgrent ()
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{
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static struct __group16 g16; /* FIXME: thread-safe? */
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return grp32togrp16 (&g16, getgrent32 ());
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}
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extern "C" void
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setgrent ()
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{
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_my_tls.locals.grp_pos = 0;
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}
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/* Internal function. ONLY USE THIS INTERNALLY, NEVER `getgrent'!!! */
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struct __group32 *
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internal_getgrent (int pos)
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{
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gr.refresh (false);
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if (pos < gr.curr_lines)
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return group_buf + pos;
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return NULL;
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}
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int
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internal_getgroups (int gidsetsize, __gid32_t *grouplist, cygpsid * srchsid)
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{
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NTSTATUS status;
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HANDLE hToken = NULL;
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ULONG size;
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int cnt = 0;
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struct __group32 *gr;
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if (!srchsid && cygheap->user.groups.issetgroups ())
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{
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cygsid sid;
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for (int gidx = 0; (gr = internal_getgrent (gidx)); ++gidx)
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if (sid.getfromgr (gr))
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for (int pg = 0; pg < cygheap->user.groups.sgsids.count (); ++pg)
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if (sid == cygheap->user.groups.sgsids.sids[pg]
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&& sid != well_known_world_sid)
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{
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if (cnt < gidsetsize)
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grouplist[cnt] = gr->gr_gid;
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++cnt;
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if (gidsetsize && cnt > gidsetsize)
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goto error;
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break;
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}
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return cnt;
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}
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/* If impersonated, use impersonation token. */
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if (cygheap->user.issetuid ())
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hToken = cygheap->user.primary_token ();
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else
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hToken = hProcToken;
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status = NtQueryInformationToken (hToken, TokenGroups, NULL, 0, &size);
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if (NT_SUCCESS (status) || status == STATUS_BUFFER_TOO_SMALL)
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{
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PTOKEN_GROUPS groups = (PTOKEN_GROUPS) alloca (size);
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status = NtQueryInformationToken (hToken, TokenGroups, groups,
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size, &size);
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if (NT_SUCCESS (status))
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{
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cygsid sid;
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if (srchsid)
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{
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for (DWORD pg = 0; pg < groups->GroupCount; ++pg)
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if ((cnt = (*srchsid == groups->Groups[pg].Sid)))
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break;
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}
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else
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for (int gidx = 0; (gr = internal_getgrent (gidx)); ++gidx)
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if (sid.getfromgr (gr))
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for (DWORD pg = 0; pg < groups->GroupCount; ++pg)
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if (sid == groups->Groups[pg].Sid
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&& (groups->Groups[pg].Attributes
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& (SE_GROUP_ENABLED | SE_GROUP_INTEGRITY_ENABLED))
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&& sid != well_known_world_sid)
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{
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if (cnt < gidsetsize)
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grouplist[cnt] = gr->gr_gid;
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++cnt;
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if (gidsetsize && cnt > gidsetsize)
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goto error;
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break;
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}
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}
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}
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else
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debug_printf ("%lu = NtQueryInformationToken(NULL) %p", size, status);
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return cnt;
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error:
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set_errno (EINVAL);
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return -1;
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}
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extern "C" int
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getgroups32 (int gidsetsize, __gid32_t *grouplist)
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{
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return internal_getgroups (gidsetsize, grouplist);
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}
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extern "C" int
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getgroups (int gidsetsize, __gid16_t *grouplist)
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{
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__gid32_t *grouplist32 = NULL;
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if (gidsetsize < 0)
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{
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set_errno (EINVAL);
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return -1;
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}
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if (gidsetsize > 0 && grouplist)
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grouplist32 = (__gid32_t *) alloca (gidsetsize * sizeof (__gid32_t));
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int ret = internal_getgroups (gidsetsize, grouplist32);
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if (gidsetsize > 0 && grouplist)
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for (int i = 0; i < ret; ++ i)
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grouplist[i] = grouplist32[i];
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return ret;
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}
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/* Core functionality of initgroups and getgrouplist. */
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static int
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get_groups (const char *user, gid_t gid, cygsidlist &gsids)
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{
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int ret = -1;
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cygheap->user.deimpersonate ();
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struct passwd *pw = internal_getpwnam (user);
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struct __group32 *gr = internal_getgrgid (gid);
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cygsid usersid, grpsid;
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if (!usersid.getfrompw (pw) || !grpsid.getfromgr (gr))
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set_errno (EINVAL);
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else if (get_server_groups (gsids, usersid, pw))
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{
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gsids += grpsid;
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ret = 0;
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}
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cygheap->user.reimpersonate ();
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return ret;
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}
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extern "C" int
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initgroups32 (const char *user, __gid32_t gid)
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{
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int ret;
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assert (user != NULL);
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cygsidlist tmp_gsids (cygsidlist_auto, 12);
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if (!(ret = get_groups (user, gid, tmp_gsids)))
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{
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cygsidlist new_gsids (cygsidlist_alloc, tmp_gsids.count ());
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for (int i = 0; i < tmp_gsids.count (); i++)
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new_gsids.sids[i] = tmp_gsids.sids[i];
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new_gsids.count (tmp_gsids.count ());
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cygheap->user.groups.update_supp (new_gsids);
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}
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syscall_printf ( "%d = initgroups(%s, %u)", ret, user, gid);
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return ret;
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}
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extern "C" int
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initgroups (const char *user, __gid16_t gid)
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{
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return initgroups32 (user, gid16togid32(gid));
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}
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extern "C" int
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getgrouplist (const char *user, gid_t gid, gid_t *groups, int *ngroups)
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{
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int ret;
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/* Note that it's not defined if groups or ngroups may be NULL!
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GLibc does not check the pointers on entry and just uses them.
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FreeBSD calls assert for ngroups and allows a NULL groups if
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*ngroups is 0. We follow FreeBSD's lead here, but always allow
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a NULL groups pointer. */
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assert (user != NULL);
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assert (ngroups != NULL);
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cygsidlist tmp_gsids (cygsidlist_auto, 12);
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if (!(ret = get_groups (user, gid, tmp_gsids)))
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{
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int cnt = 0;
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for (int i = 0; i < tmp_gsids.count (); i++)
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{
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struct __group32 *gr = internal_getgrsid (tmp_gsids.sids[i]);
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if (gr)
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{
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if (groups && cnt < *ngroups)
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groups[cnt] = gr->gr_gid;
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++cnt;
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}
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}
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if (cnt > *ngroups)
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ret = -1;
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*ngroups = cnt;
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}
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syscall_printf ( "%d = getgrouplist(%s, %u, %p, %d)",
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ret, user, gid, groups, *ngroups);
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return ret;
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}
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/* setgroups32: standards? */
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extern "C" int
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setgroups32 (int ngroups, const __gid32_t *grouplist)
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{
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syscall_printf ("setgroups32 (%d)", ngroups);
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if (ngroups < 0 || (ngroups > 0 && !grouplist))
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{
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set_errno (EINVAL);
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return -1;
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}
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cygsidlist gsids (cygsidlist_alloc, ngroups);
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struct __group32 *gr;
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if (ngroups && !gsids.sids)
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return -1;
|
|
|
|
for (int gidx = 0; gidx < ngroups; ++gidx)
|
|
{
|
|
if ((gr = internal_getgrgid (grouplist[gidx]))
|
|
&& gsids.addfromgr (gr))
|
|
continue;
|
|
debug_printf ("No sid found for gid %d", grouplist[gidx]);
|
|
gsids.free_sids ();
|
|
set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
cygheap->user.groups.update_supp (gsids);
|
|
return 0;
|
|
}
|
|
|
|
extern "C" int
|
|
setgroups (int ngroups, const __gid16_t *grouplist)
|
|
{
|
|
__gid32_t *grouplist32 = NULL;
|
|
|
|
if (ngroups > 0 && grouplist)
|
|
{
|
|
grouplist32 = (__gid32_t *) alloca (ngroups * sizeof (__gid32_t));
|
|
if (grouplist32 == NULL)
|
|
return -1;
|
|
for (int i = 0; i < ngroups; i++)
|
|
grouplist32[i] = grouplist[i];
|
|
}
|
|
return setgroups32 (ngroups, grouplist32);
|
|
}
|