diff options
Diffstat (limited to 'winsup/cygwin/grp.cc')
| -rw-r--r-- | winsup/cygwin/grp.cc | 497 |
1 files changed, 0 insertions, 497 deletions
diff --git a/winsup/cygwin/grp.cc b/winsup/cygwin/grp.cc deleted file mode 100644 index 51ccd066c..000000000 --- a/winsup/cygwin/grp.cc +++ /dev/null @@ -1,497 +0,0 @@ -/* grp.cc - - Copyright 1996, 1997, 1998, 2000, 2001, 2002 Red Hat, Inc. - - 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" -#include <grp.h> -#include <wininet.h> -#include <stdio.h> -#include <stdlib.h> -#include <errno.h> -#include "pinfo.h" -#include "security.h" -#include "fhandler.h" -#include "path.h" -#include "dtable.h" -#include "cygerrno.h" -#include "cygheap.h" -#include "pwdgrp.h" - -/* Read /etc/group only once for better performance. This is done - on the first call that needs information from it. */ - -static struct __group32 *group_buf; /* group contents in memory */ -static int curr_lines; -static int max_lines; - -/* Position in the group cache */ -#ifdef _MT_SAFE -#define grp_pos _reent_winsup ()->_grp_pos -#else -static int grp_pos = 0; -#endif - -static pwdgrp_check group_state; -static char * NO_COPY null_ptr = NULL; - -static int -parse_grp (struct __group32 &grp, char *line) -{ - char *dp = strchr (line, ':'); - - if (!dp) - return 0; - - *dp++ = '\0'; - grp.gr_name = line; - - grp.gr_passwd = dp; - dp = strchr (grp.gr_passwd, ':'); - if (dp) - { - *dp++ = '\0'; - grp.gr_gid = strtoul (line = dp, &dp, 10); - if (dp != line && *dp == ':') - { - grp.gr_mem = &null_ptr; - 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; - } - } - return 1; - } - } - return 0; -} - -/* Read one line from /etc/group into the group cache */ -static void -add_grp_line (char *line) -{ - if (curr_lines == max_lines) - { - max_lines += 10; - group_buf = (struct __group32 *) realloc (group_buf, max_lines * sizeof (struct __group32)); - } - if (parse_grp (group_buf[curr_lines], line)) - curr_lines++; -} - -class group_lock -{ - bool armed; - static NO_COPY pthread_mutex_t mutex; - public: - group_lock (bool doit) - { - if (armed = doit) - pthread_mutex_lock (&mutex); - } - ~group_lock () - { - if (armed) - pthread_mutex_unlock (&mutex); - } -}; - -pthread_mutex_t NO_COPY group_lock::mutex = (pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER; - -/* 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 */ -static void -read_etc_group () -{ - static pwdgrp_read gr; - - group_lock here (cygwin_finished_initializing); - - /* if we got blocked by the mutex, then etc_group may have been processed */ - if (group_state.isinitializing ()) - { - for (int i = 0; i < curr_lines; i++) - if ((group_buf + i)->gr_mem != &null_ptr) - free ((group_buf + i)->gr_mem); - - curr_lines = 0; - if (gr.open ("/etc/group")) - { - char *line; - while ((line = gr.gets ()) != NULL) - add_grp_line (line); - - group_state.set_last_modified (gr.get_fhandle (), gr.get_fname ()); - gr.close (); - debug_printf ("Read /etc/group, %d lines", curr_lines); - } - group_state = loaded; - - /* Complete /etc/group in memory if needed */ - if (!internal_getgrgid (myself->gid)) - { - static char linebuf [200]; - char group_name [UNLEN + 1] = "unknown"; - char strbuf[128] = ""; - - if (wincap.has_security ()) - { - struct __group32 *gr; - - cygheap->user.groups.pgsid.string (strbuf); - if ((gr = internal_getgrsid (cygheap->user.groups.pgsid))) - strlcpy (group_name, gr->gr_name, sizeof (group_name)); - } - snprintf (linebuf, sizeof (linebuf), "%s:%s:%lu:%s", - group_name, strbuf, myself->gid, cygheap->user.name ()); - debug_printf ("Completing /etc/group: %s", linebuf); - add_grp_line (linebuf); - } - } - return; -} - -struct __group32 * -internal_getgrsid (cygsid &sid) -{ - char sid_string[128]; - - if (group_state.isuninitialized ()) - read_etc_group (); - - if (sid.string (sid_string)) - for (int i = 0; i < curr_lines; i++) - if (!strcmp (sid_string, group_buf[i].gr_passwd)) - return group_buf + i; - return NULL; -} - -struct __group32 * -internal_getgrgid (__gid32_t gid, BOOL check) -{ - struct __group32 * default_grp = NULL; - - if (group_state.isuninitialized () - || (check && group_state.isinitializing ())) - read_etc_group (); - - for (int i = 0; i < curr_lines; i++) - { - if (group_buf[i].gr_gid == myself->gid) - default_grp = group_buf + i; - if (group_buf[i].gr_gid == gid) - return group_buf + i; - } - return allow_ntsec || gid != ILLEGAL_GID ? NULL : default_grp; -} - -struct __group32 * -internal_getgrnam (const char *name, BOOL check) -{ - if (group_state.isuninitialized () - || (check && group_state.isinitializing ())) - 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; -} - -static -struct __group16 * -grp32togrp16 (struct __group16 *gp16, struct __group32 *gp32) -{ - if (!gp16 || !gp32) - return NULL; - - /* Copying the pointers is actually unnecessary. Just having the correct - return type is important. */ - gp16->gr_name = gp32->gr_name; - gp16->gr_passwd = gp32->gr_passwd; - gp16->gr_gid = (__gid16_t) gp32->gr_gid; /* Not loss-free */ - gp16->gr_mem = gp32->gr_mem; - - return gp16; -} - -extern "C" struct __group32 * -getgrgid32 (__gid32_t gid) -{ - return internal_getgrgid (gid, TRUE); -} - -extern "C" struct __group16 * -getgrgid (__gid16_t gid) -{ - static struct __group16 g16; - - return grp32togrp16 (&g16, getgrgid32 ((__gid32_t) gid)); -} - -extern "C" struct __group32 * -getgrnam32 (const char *name) -{ - return internal_getgrnam (name, TRUE); -} - -extern "C" struct __group16 * -getgrnam (const char *name) -{ - static struct __group16 g16; - - return grp32togrp16 (&g16, getgrnam32 (name)); -} - -extern "C" void -endgrent () -{ - grp_pos = 0; -} - -extern "C" struct __group32 * -getgrent32 () -{ - if (group_state.isinitializing ()) - read_etc_group (); - - if (grp_pos < curr_lines) - return group_buf + grp_pos++; - - return NULL; -} - -extern "C" struct __group16 * -getgrent () -{ - static struct __group16 g16; - - return grp32togrp16 (&g16, getgrent32 ()); -} - -extern "C" void -setgrent () -{ - grp_pos = 0; -} - -/* Internal function. ONLY USE THIS INTERNALLY, NEVER `getgrent'!!! */ -struct __group32 * -internal_getgrent (int pos) -{ - if (group_state.isuninitialized ()) - read_etc_group (); - - if (pos < curr_lines) - return group_buf + pos; - return NULL; -} - -int -internal_getgroups (int gidsetsize, __gid32_t *grouplist) -{ - HANDLE hToken = NULL; - DWORD size; - int cnt = 0; - struct __group32 *gr; - __gid32_t gid; - const char *username; - - if (allow_ntsec) - { - /* If impersonated, use impersonation token. */ - if (cygheap->user.issetuid ()) - hToken = cygheap->user.token; - else if (!OpenProcessToken (hMainProc, TOKEN_QUERY, &hToken)) - hToken = NULL; - } - if (hToken) - { - if (GetTokenInformation (hToken, TokenGroups, NULL, 0, &size) - || GetLastError () == ERROR_INSUFFICIENT_BUFFER) - { - char buf[size]; - TOKEN_GROUPS *groups = (TOKEN_GROUPS *) buf; - - if (GetTokenInformation (hToken, TokenGroups, buf, size, &size)) - { - cygsid sid; - - for (int gidx = 0; (gr = internal_getgrent (gidx)); ++gidx) - if (sid.getfromgr (gr)) - for (DWORD pg = 0; pg < groups->GroupCount; ++pg) - if (sid == groups->Groups[pg].Sid && - sid != well_known_world_sid) - { - if (cnt < gidsetsize) - grouplist[cnt] = gr->gr_gid; - ++cnt; - if (gidsetsize && cnt > gidsetsize) - { - if (hToken != cygheap->user.token) - CloseHandle (hToken); - goto error; - } - break; - } - } - } - else - debug_printf ("%d = GetTokenInformation(NULL) %E", size); - if (hToken != cygheap->user.token) - CloseHandle (hToken); - if (cnt) - return cnt; - } - - gid = myself->gid; - username = cygheap->user.name (); - for (int gidx = 0; (gr = internal_getgrent (gidx)); ++gidx) - if (gid == gr->gr_gid) - { - if (cnt < gidsetsize) - grouplist[cnt] = gr->gr_gid; - ++cnt; - if (gidsetsize && cnt > gidsetsize) - goto error; - } - else if (gr->gr_mem) - for (int gi = 0; gr->gr_mem[gi]; ++gi) - if (strcasematch (username, gr->gr_mem[gi])) - { - if (cnt < gidsetsize) - grouplist[cnt] = gr->gr_gid; - ++cnt; - if (gidsetsize && cnt > gidsetsize) - goto error; - } - return cnt; - -error: - set_errno (EINVAL); - return -1; -} - -extern "C" int -getgroups32 (int gidsetsize, __gid32_t *grouplist) -{ - return internal_getgroups (gidsetsize, grouplist); -} - -extern "C" int -getgroups (int gidsetsize, __gid16_t *grouplist) -{ - __gid32_t *grouplist32 = NULL; - - if (gidsetsize < 0) - { - set_errno (EINVAL); - return -1; - } - if (gidsetsize > 0 && grouplist) - grouplist32 = (__gid32_t *) alloca (gidsetsize * sizeof (__gid32_t)); - - int ret = internal_getgroups (gidsetsize, grouplist32); - - if (gidsetsize > 0 && grouplist) - for (int i = 0; i < ret; ++ i) - grouplist[i] = grouplist32[i]; - - return ret; -} - -extern "C" int -initgroups32 (const char *, __gid32_t) -{ - if (wincap.has_security ()) - cygheap->user.groups.clear_supp (); - return 0; -} - -extern "C" int -initgroups (const char * name, __gid16_t gid) -{ - return initgroups32 (name, gid16togid32(gid)); -} - -/* setgroups32: standards? */ -extern "C" int -setgroups32 (int ngroups, const __gid32_t *grouplist) -{ - if (ngroups < 0 || (ngroups > 0 && !grouplist)) - { - set_errno (EINVAL); - return -1; - } - - if (!wincap.has_security ()) - return 0; - - cygsidlist gsids (cygsidlist_alloc, ngroups); - struct __group32 *gr; - - if (ngroups && !gsids.sids) - return -1; - - for (int gidx = 0; gidx < ngroups; ++gidx) - { - for (int gidy = 0; gidy < gidx; gidy++) - if (grouplist[gidy] == grouplist[gidx]) - goto found; /* Duplicate */ - if ((gr = internal_getgrgid (grouplist[gidx])) && - gsids.addfromgr (gr)) - goto found; - debug_printf ("No sid found for gid %d", grouplist[gidx]); - gsids.free_sids (); - set_errno (EINVAL); - return -1; - found: - continue; - } - 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); -} |