498 lines
11 KiB
C++
498 lines
11 KiB
C++
/* grp.cc
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Copyright 1996, 1997, 1998, 2000, 2001, 2002 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 <grp.h>
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#include <wininet.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "pinfo.h"
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#include "security.h"
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#include "fhandler.h"
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#include "path.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 "pwdgrp.h"
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/* Read /etc/group only once for better performance. This is done
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on the first call that needs information from it. */
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static struct __group32 *group_buf; /* group contents in memory */
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static int curr_lines;
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static int max_lines;
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/* Position in the group cache */
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#ifdef _MT_SAFE
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#define grp_pos _reent_winsup ()->_grp_pos
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#else
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static int grp_pos = 0;
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#endif
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static pwdgrp_check group_state;
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static char * NO_COPY null_ptr = NULL;
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static int
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parse_grp (struct __group32 &grp, char *line)
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{
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char *dp = strchr (line, ':');
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if (!dp)
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return 0;
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*dp++ = '\0';
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grp.gr_name = line;
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grp.gr_passwd = dp;
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dp = strchr (grp.gr_passwd, ':');
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if (dp)
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{
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*dp++ = '\0';
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grp.gr_gid = strtoul (line = dp, &dp, 10);
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if (dp != line && *dp == ':')
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{
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grp.gr_mem = &null_ptr;
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if (*++dp)
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{
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int i = 0;
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char *cp;
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for (cp = dp; (cp = strchr (cp, ',')) != NULL; ++cp)
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++i;
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char **namearray = (char **) calloc (i + 2, sizeof (char *));
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if (namearray)
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{
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i = 0;
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for (cp = dp; (cp = strchr (dp, ',')) != NULL; dp = cp + 1)
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{
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*cp = '\0';
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namearray[i++] = dp;
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}
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namearray[i++] = dp;
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namearray[i] = NULL;
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grp.gr_mem = namearray;
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}
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}
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return 1;
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}
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}
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return 0;
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}
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/* Read one line from /etc/group into the group cache */
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static void
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add_grp_line (char *line)
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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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group_buf = (struct __group32 *) realloc (group_buf, max_lines * sizeof (struct __group32));
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}
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if (parse_grp (group_buf[curr_lines], line))
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curr_lines++;
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}
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class group_lock
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{
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bool armed;
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static NO_COPY pthread_mutex_t mutex;
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public:
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group_lock (bool doit)
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{
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if (armed = doit)
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pthread_mutex_lock (&mutex);
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}
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~group_lock ()
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{
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if (armed)
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pthread_mutex_unlock (&mutex);
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}
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};
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pthread_mutex_t NO_COPY group_lock::mutex = (pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER;
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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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static void
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read_etc_group ()
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{
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static pwdgrp_read gr;
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group_lock here (cygwin_finished_initializing);
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/* if we got blocked by the mutex, then etc_group may have been processed */
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if (group_state.isinitializing ())
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{
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for (int i = 0; i < 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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curr_lines = 0;
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if (gr.open ("/etc/group"))
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{
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char *line;
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while ((line = gr.gets ()) != NULL)
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add_grp_line (line);
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group_state.set_last_modified (gr.get_fhandle (), gr.get_fname ());
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gr.close ();
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debug_printf ("Read /etc/group, %d lines", curr_lines);
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}
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group_state = loaded;
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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] = "unknown";
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char strbuf[128] = "";
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if (wincap.has_security ())
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{
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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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strlcpy (group_name, gr->gr_name, sizeof (group_name));
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}
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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_grp_line (linebuf);
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}
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}
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return;
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}
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struct __group32 *
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internal_getgrsid (cygsid &sid)
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{
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char sid_string[128];
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if (group_state.isuninitialized ())
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read_etc_group ();
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if (sid.string (sid_string))
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for (int i = 0; i < 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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struct __group32 * default_grp = NULL;
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if (group_state.isuninitialized ()
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|| (check && group_state.isinitializing ()))
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read_etc_group ();
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for (int i = 0; i < curr_lines; i++)
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{
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if (group_buf[i].gr_gid == myself->gid)
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default_grp = group_buf + i;
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if (group_buf[i].gr_gid == gid)
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return group_buf + i;
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}
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return allow_ntsec || gid != ILLEGAL_GID ? NULL : default_grp;
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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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if (group_state.isuninitialized ()
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|| (check && group_state.isinitializing ()))
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read_etc_group ();
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for (int i = 0; i < 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
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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" 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;
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return grp32togrp16 (&g16, getgrgid32 ((__gid32_t) gid));
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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;
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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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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 (group_state.isinitializing ())
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read_etc_group ();
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if (grp_pos < curr_lines)
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return group_buf + 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;
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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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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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if (group_state.isuninitialized ())
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read_etc_group ();
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if (pos < 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)
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{
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HANDLE hToken = NULL;
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DWORD size;
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int cnt = 0;
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struct __group32 *gr;
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__gid32_t gid;
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const char *username;
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if (allow_ntsec)
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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.token;
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else if (!OpenProcessToken (hMainProc, TOKEN_QUERY, &hToken))
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hToken = NULL;
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}
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if (hToken)
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{
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if (GetTokenInformation (hToken, TokenGroups, NULL, 0, &size)
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|| GetLastError () == ERROR_INSUFFICIENT_BUFFER)
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{
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char buf[size];
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TOKEN_GROUPS *groups = (TOKEN_GROUPS *) buf;
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if (GetTokenInformation (hToken, TokenGroups, buf, size, &size))
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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 (DWORD pg = 0; pg < groups->GroupCount; ++pg)
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if (sid == groups->Groups[pg].Sid &&
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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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{
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if (hToken != cygheap->user.token)
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CloseHandle (hToken);
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goto error;
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}
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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 ("%d = GetTokenInformation(NULL) %E", size);
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if (hToken != cygheap->user.token)
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CloseHandle (hToken);
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if (cnt)
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return cnt;
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}
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gid = myself->gid;
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username = cygheap->user.name ();
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for (int gidx = 0; (gr = internal_getgrent (gidx)); ++gidx)
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if (gid == gr->gr_gid)
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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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}
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else if (gr->gr_mem)
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for (int gi = 0; gr->gr_mem[gi]; ++gi)
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if (strcasematch (username, gr->gr_mem[gi]))
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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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}
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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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extern "C" int
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initgroups32 (const char *, __gid32_t)
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{
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if (wincap.has_security ())
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cygheap->user.groups.clear_supp ();
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return 0;
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}
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extern "C" int
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initgroups (const char * name, __gid16_t gid)
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{
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return initgroups32 (name, gid16togid32(gid));
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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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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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if (!wincap.has_security ())
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return 0;
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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;
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for (int gidx = 0; gidx < ngroups; ++gidx)
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{
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for (int gidy = 0; gidy < gidx; gidy++)
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if (grouplist[gidy] == grouplist[gidx])
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goto found; /* Duplicate */
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if ((gr = internal_getgrgid (grouplist[gidx])) &&
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gsids.addfromgr (gr))
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goto found;
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debug_printf ("No sid found for gid %d", grouplist[gidx]);
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gsids.free_sids ();
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set_errno (EINVAL);
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return -1;
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found:
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continue;
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}
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cygheap->user.groups.update_supp (gsids);
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return 0;
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}
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extern "C" int
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setgroups (int ngroups, const __gid16_t *grouplist)
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{
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__gid32_t *grouplist32 = NULL;
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if (ngroups > 0 && grouplist)
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{
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grouplist32 = (__gid32_t *) alloca (ngroups * sizeof (__gid32_t));
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if (grouplist32 == NULL)
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return -1;
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for (int i = 0; i < ngroups; i++)
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grouplist32[i] = grouplist[i];
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}
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return setgroups32 (ngroups, grouplist32);
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}
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