newlib-cygwin/winsup/cygwin/grp.cc

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/* grp.cc
Copyright 1996, 1997, 1998, 2000 Cygnus Solutions.
Original stubs by Jason Molenda of Cygnus Support, crash@cygnus.com
First implementation by Gunther Ebert, gunther.ebert@ixos-leipzig.de
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
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#include <grp.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include "sync.h"
#include "sigproc.h"
#include "pinfo.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "cygerrno.h"
#include "security.h"
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/* Read /etc/group only once for better performance. This is done
on the first call that needs information from it. */
#define MAX_DOMAIN_NAME 100
static NO_COPY const char *etc_group = "/etc/group";
static struct group *group_buf = NULL; /* group contents in memory */
static int curr_lines = 0;
static int max_lines = 0;
/* Position in the group cache */
#ifdef _MT_SAFE
#define grp_pos _reent_winsup()->_grp_pos
#else
static int grp_pos = 0;
#endif
/* Set to loaded when /etc/passwd has been read in by read_etc_passwd ().
Set to emulated if passwd is emulated. */
/* Functions in this file need to check the value of passwd_state
and read in the password file if it isn't set. */
enum grp_state {
uninitialized = 0,
initializing,
emulated,
loaded
};
static grp_state group_state = uninitialized;
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static int
parse_grp (struct group &grp, const char *line)
{
int len = strlen(line);
char *newline = (char *) malloc (len + 1);
(void) memcpy (newline, line, len + 1);
if (newline[--len] == '\n')
newline[len] = '\0';
char *dp = strchr (newline, ':');
if (!dp)
return 0;
*dp++ = '\0';
grp.gr_name = newline;
grp.gr_passwd = dp;
dp = strchr (grp.gr_passwd, ':');
if (dp)
{
*dp++ = '\0';
if (!strlen (grp.gr_passwd))
grp.gr_passwd = NULL;
grp.gr_gid = strtol (dp, NULL, 10);
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dp = strchr (dp, ':');
if (dp)
{
if (*++dp)
{
int i = 0;
char *cp;
for (cp = dp; (cp = strchr (cp, ',')) != NULL; ++cp)
++i;
char **namearray = (char **) calloc (i + 2, sizeof (char *));
if (namearray)
{
i = 0;
for (cp = dp; (cp = strchr (dp, ',')) != NULL; dp = cp + 1)
{
*cp = '\0';
namearray[i++] = dp;
}
namearray[i++] = dp;
namearray[i] = NULL;
}
grp.gr_mem = namearray;
}
else
grp.gr_mem = (char **) calloc (1, sizeof (char *));
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return 1;
}
}
return 0;
}
/* Read one line from /etc/group into the group cache */
static void
add_grp_line (const char *line)
{
if (curr_lines == max_lines)
{
max_lines += 10;
group_buf = (struct group *) realloc (group_buf, max_lines * sizeof (struct group));
}
if (parse_grp (group_buf[curr_lines], line))
curr_lines++;
}
extern PSID get_admin_sid ();
/* Cygwin internal */
/* Read in /etc/group and save contents in the group cache */
/* This sets group_in_memory_p to 1 so functions in this file can
tell that /etc/group has been read in */
/* FIXME: should be static but this is called in uinfo_init outside this
file */
void
read_etc_group ()
{
Throughout, change 'cygwin_shared.mount' to 'mount_table'. * child_info.h (child_info): Move shared_h, console_h to cygheap. Add mount_h. * cygheap.h (init_cygheap): Add shared_h, console_h. * cygheap.cc (init_cheap): Initialize heap at a fixed location after the shared memory regions. Initialize cygheap->user name here. * dcrt0.cc (dll_crt0_1): Call getpagesize () to initialize constants. Remove cygheap_init since it is done in shared_init now. (_dll_crt0): Initialize mount_h, remove shared_h and console_h initialization. * fhandler_console.cc (console_shared_h): Eliminate. (get_tty_stuff): Use cygheap->console_h rather than console_shared_h. * heap.cc (heap_init): Use page size constant calculated earlier in initialization. * shared.cc: Eliminate cygwin_shared_h. Add cygwin_mount_h. (mount_table_init): New function for initializing a user mount table. (open_shared_file_map): Use constant for shared memory region. Initialize cygheap and mount table here. (open_shared): Improve debugging output. (shared_info::initialize): Eliminate call to mount.init. (shared_terminate): Use cygheap->shared_h. Close cygwin_mount_h. (open_shared_file_map): Eliminate. * shared_info.h (mount_info): Add a version field. (shared_align_past): New macro for calculating location for shared memory regions. * sigproc.cc (init_child_info): Eliminate shared_h, console_h. * spawn.cc (spawn_guts): Pass on cygwin_mount_h iff not a different user. * syscalls.cc (system_info): New global holding system memory defaults. (getpagesize): Use system_info. * uinfo.cc (internal_getlogin): Only fill in user name if nonexistent. * winsup.h: Declare system_info. * passwd.cc (read_etc_passwd): Use cygheap->user.name () rather than retrieving the name again.
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char linebuf [200];
char group_name [MAX_USER_NAME];
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DWORD group_name_len = MAX_USER_NAME;
strncpy (group_name, "Administrators", sizeof (group_name));
static pthread_mutex_t etc_group_mutex = (pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_lock (&etc_group_mutex);
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/* if we got blocked by the mutex, then etc_group may have been processed */
if (group_state != uninitialized)
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{
pthread_mutex_unlock(&etc_group_mutex);
return;
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}
if (group_state != initializing)
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{
group_state = initializing;
FILE *f = fopen (etc_group, "rt");
if (f)
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{
while (fgets (linebuf, sizeof (linebuf), f) != NULL)
{
if (strlen (linebuf))
add_grp_line (linebuf);
}
fclose (f);
group_state = loaded;
}
else /* /etc/group doesn't exist -- create default one in memory */
{
char domain_name [MAX_DOMAIN_NAME];
DWORD domain_name_len = MAX_DOMAIN_NAME;
SID_NAME_USE acType;
debug_printf ("Emulating /etc/group");
if (! LookupAccountSidA (NULL ,
get_admin_sid () ,
group_name,
&group_name_len,
domain_name,
&domain_name_len,
&acType))
{
strcpy (group_name, "unknown");
debug_printf ("Failed to get local admins group name. %E");
}
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snprintf (linebuf, sizeof (linebuf), "%s::%u:\n", group_name, DEFAULT_GID);
add_grp_line (linebuf);
group_state = emulated;
}
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}
pthread_mutex_unlock(&etc_group_mutex);
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}
extern "C"
struct group *
getgrgid (gid_t gid)
{
struct group * default_grp = NULL;
if (group_state <= initializing)
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read_etc_group();
for (int i = 0; i < curr_lines; i++)
{
if (group_buf[i].gr_gid == DEFAULT_GID)
default_grp = group_buf + i;
if (group_buf[i].gr_gid == gid)
return group_buf + i;
}
return default_grp;
}
extern "C"
struct group *
getgrnam (const char *name)
{
if (group_state <= initializing)
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read_etc_group();
for (int i = 0; i < curr_lines; i++)
if (strcasematch (group_buf[i].gr_name, name))
return group_buf + i;
/* Didn't find requested group */
return NULL;
}
extern "C"
void
endgrent()
{
grp_pos = 0;
}
extern "C"
struct group *
getgrent()
{
if (group_state <= initializing)
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read_etc_group();
if (grp_pos < curr_lines)
return group_buf + grp_pos++;
return NULL;
}
extern "C"
void
setgrent ()
{
grp_pos = 0;
}
int
getgroups (int gidsetsize, gid_t *grouplist, gid_t gid, const char *username)
{
HANDLE hToken = NULL;
char buf[4096];
DWORD size;
int cnt = 0;
if (group_state <= initializing)
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read_etc_group();
if (allow_ntsec &&
OpenProcessToken (hMainProc, TOKEN_QUERY, &hToken) &&
GetTokenInformation (hToken, TokenGroups, buf, 4096, &size))
{
TOKEN_GROUPS *groups = (TOKEN_GROUPS *) buf;
char ssid[MAX_SID_LEN];
PSID sid = (PSID) ssid;
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for (DWORD pg = 0; pg < groups->GroupCount; ++pg)
{
struct group *gr;
while ((gr = getgrent ()) != NULL)
{
if (get_gr_sid (sid, gr) &&
EqualSid (sid, groups->Groups[pg].Sid))
{
if (cnt < gidsetsize)
grouplist[cnt] = gr->gr_gid;
++cnt;
if (gidsetsize && cnt > gidsetsize)
goto error;
break;
}
}
endgrent ();
}
CloseHandle (hToken);
return cnt;
}
else
{
for (int i = 0; i < curr_lines; ++i)
if (gid == group_buf[i].gr_gid)
{
if (cnt < gidsetsize)
grouplist[cnt] = group_buf[i].gr_gid;
++cnt;
if (gidsetsize && cnt > gidsetsize)
goto error;
}
else if (group_buf[i].gr_mem)
for (int gi = 0; group_buf[i].gr_mem[gi]; ++gi)
if (strcasematch (username, group_buf[i].gr_mem[gi]))
{
if (cnt < gidsetsize)
grouplist[cnt] = group_buf[i].gr_gid;
++cnt;
if (gidsetsize && cnt > gidsetsize)
goto error;
}
return cnt;
}
error:
set_errno (EINVAL);
return -1;
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}
extern "C"
int
getgroups (int gidsetsize, gid_t *grouplist)
{
return getgroups (gidsetsize, grouplist, myself->gid, cygheap->user.name ());
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}
extern "C"
int
initgroups (const char *, gid_t)
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{
return 0;
}