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uinfo.cc
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/* uinfo.cc: user info (uid, gid, etc...)
Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
2007, 2008, 2009, 2010, 2011, 2012, 2014, 2015 Red Hat, Inc.
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 <iptypes.h>
#include <lm.h>
#include <ntsecapi.h>
#include <wininet.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <wchar.h>
#include <sys/cygwin.h>
#include "cygerrno.h"
#include "pinfo.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "shared_info.h"
#include "registry.h"
#include "child_info.h"
#include "environ.h"
#include "tls_pbuf.h"
#include "miscfuncs.h"
#include "ntdll.h"
#include "ldap.h"
#include "cygserver_pwdgrp.h"
/* Initialize the part of cygheap_user that does not depend on files.
The information is used in shared.cc for the user shared.
Final initialization occurs in uinfo_init */
void
cygheap_user::init ()
{
WCHAR user_name[UNLEN + 1];
DWORD user_name_len = UNLEN + 1;
/* This code is only run if a Cygwin process gets started by a native
Win32 process. We try to get the username from the environment,
first USERNAME (Win32), then USER (POSIX). If that fails (which is
very unlikely), it only has an impact if we don't have an entry in
/etc/passwd for this user either. In that case the username sticks
to "unknown". Since this is called early in initialization, and
since we don't want pull in a dependency to any other DLL except
ntdll and kernel32 at this early stage, don't call GetUserName,
GetUserNameEx, NetWkstaUserGetInfo, etc. */
if (GetEnvironmentVariableW (L"USERNAME", user_name, user_name_len)
|| GetEnvironmentVariableW (L"USER", user_name, user_name_len))
{
char mb_user_name[user_name_len = sys_wcstombs (NULL, 0, user_name)];
sys_wcstombs (mb_user_name, user_name_len, user_name);
set_name (mb_user_name);
}
else
set_name ("unknown");
NTSTATUS status;
ULONG size;
PSECURITY_DESCRIPTOR psd;
status = NtQueryInformationToken (hProcToken, TokenPrimaryGroup,
&groups.pgsid, sizeof (cygsid), &size);
if (!NT_SUCCESS (status))
system_printf ("NtQueryInformationToken (TokenPrimaryGroup), %y", status);
/* Get the SID from current process and store it in effec_cygsid */
status = NtQueryInformationToken (hProcToken, TokenUser, &effec_cygsid,
sizeof (cygsid), &size);
if (!NT_SUCCESS (status))
{
system_printf ("NtQueryInformationToken (TokenUser), %y", status);
return;
}
/* Set token owner to the same value as token user */
status = NtSetInformationToken (hProcToken, TokenOwner, &effec_cygsid,
sizeof (cygsid));
if (!NT_SUCCESS (status))
debug_printf ("NtSetInformationToken (TokenOwner), %y", status);
/* Standard way to build a security descriptor with the usual DACL */
PSECURITY_ATTRIBUTES sa_buf = (PSECURITY_ATTRIBUTES) alloca (1024);
psd = (PSECURITY_DESCRIPTOR)
(sec_user_nih (sa_buf, sid()))->lpSecurityDescriptor;
BOOLEAN acl_exists, dummy;
TOKEN_DEFAULT_DACL dacl;
status = RtlGetDaclSecurityDescriptor (psd, &acl_exists, &dacl.DefaultDacl,
&dummy);
if (NT_SUCCESS (status) && acl_exists && dacl.DefaultDacl)
{
/* Set the default DACL and the process DACL */
status = NtSetInformationToken (hProcToken, TokenDefaultDacl, &dacl,
sizeof (dacl));
if (!NT_SUCCESS (status))
system_printf ("NtSetInformationToken (TokenDefaultDacl), %y", status);
if ((status = NtSetSecurityObject (NtCurrentProcess (),
DACL_SECURITY_INFORMATION, psd)))
system_printf ("NtSetSecurityObject, %y", status);
}
else
system_printf("Cannot get dacl, %E");
}
void
internal_getlogin (cygheap_user &user)
{
struct passwd *pwd;
struct group *pgrp, *grp, *grp2;
cyg_ldap cldap;
/* Fetch (and potentially generate) passwd and group entries for the user
and the primary group in the token. */
pwd = internal_getpwsid (user.sid (), &cldap);
pgrp = internal_getgrsid (user.groups.pgsid, &cldap);
if (!cygheap->pg.nss_cygserver_caching ())
internal_getgroups (0, NULL, &cldap);
if (!pwd)
debug_printf ("user not found in passwd DB");
else
{
cygsid gsid;
user.set_name (pwd->pw_name);
myself->uid = pwd->pw_uid;
myself->gid = pwd->pw_gid;
/* If the primary group in the passwd DB is different from the primary
group in the user token, we have to find the SID of that group and
try to override the token primary group. */
if (!pgrp || myself->gid != pgrp->gr_gid)
{
if (gsid.getfromgr (grp = internal_getgrgid (pwd->pw_gid, &cldap)))
{
/* We might have a group file with a group entry for the current
user's primary group, but the current user has no entry in
passwd. If so, pw_gid is taken from windows and might
disagree with gr_gid from the group file. Overwrite it. */
if ((grp2 = internal_getgrsid (gsid, &cldap)) && grp2 != grp)
myself->gid = pwd->pw_gid = grp2->gr_gid;
/* Set primary group to the group in /etc/passwd. */
if (gsid != user.groups.pgsid)
{
NTSTATUS status = NtSetInformationToken (hProcToken,
TokenPrimaryGroup,
&gsid, sizeof gsid);
if (!NT_SUCCESS (status))
{
debug_printf ("NtSetInformationToken (TokenPrimaryGroup),"
" %y", status);
/* Revert the primary group setting and override the
setting in the passwd entry. */
if (pgrp)
myself->gid = pwd->pw_gid = pgrp->gr_gid;
}
else
user.groups.pgsid = gsid;
clear_procimptoken ();
}
}
else
debug_printf ("group not found in group DB");
}
}
cygheap->user.ontherange (CH_HOME, pwd);
}
void
uinfo_init ()
{
if (child_proc_info && !cygheap->user.has_impersonation_tokens ())
return;
if (!child_proc_info)
internal_getlogin (cygheap->user); /* Set the cygheap->user. */
/* Conditions must match those in spawn to allow starting child
processes with ruid != euid and rgid != egid. */
else if (cygheap->user.issetuid ()
&& cygheap->user.saved_uid == cygheap->user.real_uid
&& cygheap->user.saved_gid == cygheap->user.real_gid
&& !cygheap->user.groups.issetgroups ()
&& !cygheap->user.setuid_to_restricted)
{
cygheap->user.reimpersonate ();
return;
}
else
cygheap->user.close_impersonation_tokens ();
cygheap->user.saved_uid = cygheap->user.real_uid = myself->uid;
cygheap->user.saved_gid = cygheap->user.real_gid = myself->gid;
cygheap->user.external_token = NO_IMPERSONATION;
cygheap->user.internal_token = NO_IMPERSONATION;
cygheap->user.curr_primary_token = NO_IMPERSONATION;
cygheap->user.curr_imp_token = NO_IMPERSONATION;
cygheap->user.ext_token_is_restricted = false;
cygheap->user.curr_token_is_restricted = false;
cygheap->user.setuid_to_restricted = false;
cygheap->user.set_saved_sid (); /* Update the original sid */
cygheap->user.deimpersonate ();
}
extern "C" int
getlogin_r (char *name, size_t namesize)
{
const char *login = cygheap->user.name ();
size_t len = strlen (login) + 1;
if (len > namesize)
return ERANGE;
__try
{
strncpy (name, login, len);
}
__except (NO_ERROR)
{
return EFAULT;
}
__endtry
return 0;
}
extern "C" char *
getlogin (void)
{
static char username[UNLEN];
int ret = getlogin_r (username, UNLEN);
if (ret)
{
set_errno (ret);
return NULL;
}
return username;
}
extern "C" uid_t
getuid32 (void)
{
return cygheap->user.real_uid;
}
#ifdef __x86_64__
EXPORT_ALIAS (getuid32, getuid)
#else
extern "C" __uid16_t
getuid (void)
{
return cygheap->user.real_uid;
}
#endif
extern "C" gid_t
getgid32 (void)
{
return cygheap->user.real_gid;
}
#ifdef __x86_64__
EXPORT_ALIAS (getgid32, getgid)
#else
extern "C" __gid16_t
getgid (void)
{
return cygheap->user.real_gid;
}
#endif
extern "C" uid_t
geteuid32 (void)
{
return myself->uid;
}
#ifdef __x86_64__
EXPORT_ALIAS (geteuid32, geteuid)
#else
extern "C" uid_t
geteuid (void)
{
return myself->uid;
}
#endif
extern "C" gid_t
getegid32 (void)
{
return myself->gid;
}
#ifdef __x86_64__
EXPORT_ALIAS (getegid32, getegid)
#else
extern "C" __gid16_t
getegid (void)
{
return myself->gid;
}
#endif
/* Not quite right - cuserid can change, getlogin can't */
extern "C" char *
cuserid (char *src)
{
if (!src)
return getlogin ();
strcpy (src, getlogin ());
return src;
}
const char *
cygheap_user::ontherange (homebodies what, struct passwd *pw)
{
char homedrive_env_buf[3];
char *newhomedrive = NULL;
char *newhomepath = NULL;
tmp_pathbuf tp;
debug_printf ("what %d, pw %p", what, pw);
if (what == CH_HOME)
{
char *p;
if ((p = getenv ("HOME")))
debug_printf ("HOME is already in the environment %s", p);
else
{
if (pw && pw->pw_dir && *pw->pw_dir)
{
debug_printf ("Set HOME (from account db) to %s", pw->pw_dir);
setenv ("HOME", pw->pw_dir, 1);
}
else
{
char home[strlen (name ()) + 8];
debug_printf ("Set HOME to default /home/USER");
__small_sprintf (home, "/home/%s", name ());
setenv ("HOME", home, 1);
}
}
}
if (what != CH_HOME && homepath == NULL)
{
WCHAR wuser[UNLEN + 1];
WCHAR wlogsrv[INTERNET_MAX_HOST_NAME_LENGTH + 3];
PUSER_INFO_3 ui = NULL;
char *homepath_env_buf = tp.c_get ();
WCHAR profile[MAX_PATH];
WCHAR win_id[UNLEN + 1]; /* Large enough for SID */
homepath_env_buf[0] = homepath_env_buf[1] = '\0';
/* Use Cygwin home as HOMEDRIVE/HOMEPATH in the first place. This
should cover it completely, in theory. Still, it might be the
wrong choice in the long run, which might demand to set HOMEDRIVE/
HOMEPATH to the correct values per Windows. Keep the entire rest
of the code mainly for this reason, so switching is easy. */
pw = internal_getpwsid (sid ());
if (pw && pw->pw_dir && *pw->pw_dir)
cygwin_conv_path (CCP_POSIX_TO_WIN_A, pw->pw_dir, homepath_env_buf,
NT_MAX_PATH);
/* First fallback: Windows path per Windows user DB. */
else if (logsrv ())
{
sys_mbstowcs (wlogsrv, sizeof (wlogsrv) / sizeof (*wlogsrv),
logsrv ());
sys_mbstowcs (wuser, sizeof wuser / sizeof *wuser, winname ());
if (NetUserGetInfo (wlogsrv, wuser, 3, (LPBYTE *) &ui)
== NERR_Success)
{
if (ui->usri3_home_dir_drive && *ui->usri3_home_dir_drive)
{
sys_wcstombs (homepath_env_buf, NT_MAX_PATH,
ui->usri3_home_dir_drive);
strcat (homepath_env_buf, "\\");
}
else if (ui->usri3_home_dir && *ui->usri3_home_dir)
sys_wcstombs (homepath_env_buf, NT_MAX_PATH,
ui->usri3_home_dir);
}
if (ui)
NetApiBufferFree (ui);
}
/* Second fallback: Windows profile dir. */
if (!homepath_env_buf[0]
&& get_user_profile_directory (get_windows_id (win_id),
profile, MAX_PATH))
sys_wcstombs (homepath_env_buf, NT_MAX_PATH, profile);
/* Last fallback: Cygwin root dir. */
if (!homepath_env_buf[0])
cygwin_conv_path (CCP_POSIX_TO_WIN_A | CCP_ABSOLUTE,
"/", homepath_env_buf, NT_MAX_PATH);
if (homepath_env_buf[1] != ':')
{
newhomedrive = almost_null;
newhomepath = homepath_env_buf;
}
else
{
homedrive_env_buf[0] = homepath_env_buf[0];
homedrive_env_buf[1] = homepath_env_buf[1];
homedrive_env_buf[2] = '\0';
newhomedrive = homedrive_env_buf;
newhomepath = homepath_env_buf + 2;
}
}
if (newhomedrive && newhomedrive != homedrive)
cfree_and_set (homedrive, (newhomedrive == almost_null)
? almost_null : cstrdup (newhomedrive));
if (newhomepath && newhomepath != homepath)
cfree_and_set (homepath, cstrdup (newhomepath));
switch (what)
{
case CH_HOMEDRIVE:
return homedrive;
case CH_HOMEPATH:
return homepath;
default:
return homepath;
}
}
const char *
cygheap_user::test_uid (char *&what, const char *name, size_t namelen)
{
if (!what && !issetuid ())
what = getwinenveq (name, namelen, HEAP_STR);
return what;
}
const char *
cygheap_user::env_logsrv (const char *name, size_t namelen)
{
if (test_uid (plogsrv, name, namelen))
return plogsrv;
const char *mydomain = domain ();
const char *myname = winname ();
if (!mydomain || ascii_strcasematch (myname, "SYSTEM"))
return almost_null;
WCHAR wdomain[MAX_DOMAIN_NAME_LEN + 1];
WCHAR wlogsrv[INTERNET_MAX_HOST_NAME_LENGTH + 3];
sys_mbstowcs (wdomain, MAX_DOMAIN_NAME_LEN + 1, mydomain);
cfree_and_set (plogsrv, almost_null);
if (get_logon_server (wdomain, wlogsrv, DS_IS_FLAT_NAME))
sys_wcstombs_alloc (&plogsrv, HEAP_STR, wlogsrv);
return plogsrv;
}
const char *
cygheap_user::env_domain (const char *name, size_t namelen)
{
if (pwinname && test_uid (pdomain, name, namelen))
return pdomain;
DWORD ulen = UNLEN + 1;
WCHAR username[ulen];
DWORD dlen = MAX_DOMAIN_NAME_LEN + 1;
WCHAR userdomain[dlen];
SID_NAME_USE use;
cfree_and_set (pwinname, almost_null);
cfree_and_set (pdomain, almost_null);
if (!LookupAccountSidW (NULL, sid (), username, &ulen,
userdomain, &dlen, &use))
__seterrno ();
else
{
sys_wcstombs_alloc (&pwinname, HEAP_STR, username);
sys_wcstombs_alloc (&pdomain, HEAP_STR, userdomain);
}
return pdomain;
}
const char *
cygheap_user::env_userprofile (const char *name, size_t namelen)
{
if (test_uid (puserprof, name, namelen))
return puserprof;
/* User profile path is never longer than MAX_PATH. */
WCHAR profile[MAX_PATH];
WCHAR win_id[UNLEN + 1]; /* Large enough for SID */
cfree_and_set (puserprof, almost_null);
if (get_user_profile_directory (get_windows_id (win_id), profile, MAX_PATH))
sys_wcstombs_alloc (&puserprof, HEAP_STR, profile);
return puserprof;
}
const char *
cygheap_user::env_homepath (const char *name, size_t namelen)
{
return ontherange (CH_HOMEPATH);
}
const char *
cygheap_user::env_homedrive (const char *name, size_t namelen)
{
return ontherange (CH_HOMEDRIVE);
}
const char *
cygheap_user::env_name (const char *name, size_t namelen)
{
if (!test_uid (pwinname, name, namelen))
domain ();
return pwinname;
}
const char *
cygheap_user::env_systemroot (const char *name, size_t namelen)
{
if (!psystemroot)
{
int size = GetSystemWindowsDirectoryW (NULL, 0);
if (size > 0)
{
WCHAR wsystemroot[size];
size = GetSystemWindowsDirectoryW (wsystemroot, size);
if (size > 0)
sys_wcstombs_alloc (&psystemroot, HEAP_STR, wsystemroot);
}
if (size <= 0)
debug_printf ("GetSystemWindowsDirectoryW(), %E");
}
return psystemroot;
}
char *
pwdgrp::next_str (char c)
{
char *res = lptr;
lptr = strchrnul (lptr, c);
if (*lptr)
*lptr++ = '\0';
return res;
}
bool
pwdgrp::next_num (unsigned long& n)
{
char *p = next_str (':');
char *cp;
n = strtoul (p, &cp, 10);
return p != cp && !*cp;
}
char *
pwdgrp::add_line (char *eptr)
{
if (eptr)
{
if (curr_lines >= max_lines)
{
max_lines += 10;
pwdgrp_buf = crealloc_abort (pwdgrp_buf,
max_lines * pwdgrp_buf_elem_size);
}
lptr = eptr;
if (!(this->*parse) ())
return NULL;
curr_lines++;
}
return eptr;
}
void
cygheap_pwdgrp::init ()
{
pwd_cache.cygserver.init_pwd ();
pwd_cache.file.init_pwd ();
pwd_cache.win.init_pwd ();
grp_cache.cygserver.init_grp ();
grp_cache.file.init_grp ();
grp_cache.win.init_grp ();
/* Default settings:
passwd: files db
group: files db
db_prefix: auto DISABLED
db_separator: + DISABLED
db_home: cygwin desc
db_shell: cygwin desc
db_gecos: cygwin desc
db_enum: cache builtin
*/
pwd_src = (NSS_SRC_FILES | NSS_SRC_DB);
grp_src = (NSS_SRC_FILES | NSS_SRC_DB);
prefix = NSS_PFX_AUTO;
separator[0] = L'+';
#if 0
home_scheme[0].method = NSS_SCHEME_CYGWIN;
home_scheme[1].method = NSS_SCHEME_DESC;
shell_scheme[0].method = NSS_SCHEME_CYGWIN;
shell_scheme[1].method = NSS_SCHEME_DESC;
gecos_scheme[0].method = NSS_SCHEME_CYGWIN;
gecos_scheme[1].method = NSS_SCHEME_DESC;
#endif
enums = (ENUM_CACHE | ENUM_BUILTIN);
enum_tdoms = NULL;
caching = true; /* INTERNAL ONLY */
}
#define NSS_NCMP(s) (!strncmp(c, (s), sizeof(s)-1))
#define NSS_CMP(s) (!strncmp(c, (s), sizeof(s)-1) \
&& strchr (" \t", c[sizeof(s)-1]))
/* The /etc/nsswitch.conf file is read exactly once by the root process of a
process tree. We can't afford methodical changes during the lifetime of a
process tree. */
void
cygheap_pwdgrp::nss_init_line (const char *line)
{
const char *c = line + strspn (line, " \t");
char *comment = strchr (c, '#');
if (comment)
*comment = '\0';
switch (*c)
{
case 'p':
case 'g':
{
uint32_t *src = NULL;
if (NSS_NCMP ("passwd:"))
src = &pwd_src;
else if (NSS_NCMP ("group:"))
src = &grp_src;
c = strchr (c, ':') + 1;
if (src)
{
*src = 0;
while (*(c += strspn (c, " \t")))
{
if (NSS_CMP ("files"))
{
*src |= NSS_SRC_FILES;
c += 5;
}
else if (NSS_CMP ("db"))
{
*src |= NSS_SRC_DB;
c += 2;
}
else
{
c += strcspn (c, " \t");
debug_printf ("Invalid nsswitch.conf content: %s", line);
}
}
if (*src == 0)
*src = (NSS_SRC_FILES | NSS_SRC_DB);
}
}
break;
case 'd':
if (!NSS_NCMP ("db_"))
{
debug_printf ("Invalid nsswitch.conf content: %s", line);
break;
}
c += 3;
#if 0 /* Disable setting prefix and separator from nsswitch.conf for now.
Remove if nobody complains too loudly. */
if (NSS_NCMP ("prefix:"))
{
c = strchr (c, ':') + 1;
c += strspn (c, " \t");
if (NSS_CMP ("auto"))
prefix = NSS_AUTO;
else if (NSS_CMP ("primary"))
prefix = NSS_PRIMARY;
else if (NSS_CMP ("always"))
prefix = NSS_ALWAYS;
else
debug_printf ("Invalid nsswitch.conf content: %s", line);
}
else if (NSS_NCMP ("separator:"))
{
c = strchr (c, ':') + 1;
c += strspn (c, " \t");
if ((unsigned char) *c <= 0x7f && *c != ':' && strchr (" \t", c[1]))
separator[0] = (unsigned char) *c;
else
debug_printf ("Invalid nsswitch.conf content: %s", line);
}
else
#endif
if (NSS_NCMP ("enum:"))
{
tmp_pathbuf tp;
char *tdoms = tp.c_get ();
char *td = tdoms;
int new_enums = ENUM_NONE;
td[0] = '\0';
c = strchr (c, ':') + 1;
c += strspn (c, " \t");
while (!strchr (" \t", *c))
{
const char *e = c + strcspn (c, " \t");
if (NSS_CMP ("none"))
new_enums = ENUM_NONE;
else if (NSS_CMP ("builtin"))
new_enums |= ENUM_BUILTIN;
else if (NSS_CMP ("cache"))
new_enums |= ENUM_CACHE;
else if (NSS_CMP ("files"))
new_enums |= ENUM_FILES;
else if (NSS_CMP ("local"))
new_enums |= ENUM_LOCAL;
else if (NSS_CMP ("primary"))
new_enums |= ENUM_PRIMARY;
else if (NSS_CMP ("alltrusted"))
new_enums |= ENUM_TDOMS | ENUM_TDOMS_ALL;
else if (NSS_CMP ("all"))
new_enums |= ENUM_ALL;
else
{
td = stpcpy (stpncpy (td, c, e - c), " ");
new_enums |= ENUM_TDOMS;
}
c = e;
c += strspn (c, " \t");
}
if ((new_enums & (ENUM_TDOMS | ENUM_TDOMS_ALL)) == ENUM_TDOMS)
{
if (td > tdoms)
{
PWCHAR spc;
sys_mbstowcs_alloc (&enum_tdoms, HEAP_BUF, tdoms);
/* Convert string to REG_MULTI_SZ-style. */
while ((spc = wcsrchr (enum_tdoms, L' ')))
*spc = L'\0';
}
else
new_enums &= ~(ENUM_TDOMS | ENUM_TDOMS_ALL);
}
enums = new_enums;
}
else
{
nss_scheme_t *scheme = NULL;
if (NSS_NCMP ("home:"))
scheme = home_scheme;
else if (NSS_NCMP ("shell:"))
scheme = shell_scheme;
else if (NSS_NCMP ("gecos:"))
scheme = gecos_scheme;
if (scheme)
{
uint16_t idx = 0;
scheme[0].method = scheme[1].method = NSS_SCHEME_FALLBACK;
c = strchr (c, ':') + 1;
c += strspn (c, " \t");
while (*c && idx < NSS_SCHEME_MAX)
{
if (NSS_CMP ("windows"))
scheme[idx].method = NSS_SCHEME_WINDOWS;
else if (NSS_CMP ("cygwin"))
scheme[idx].method = NSS_SCHEME_CYGWIN;
else if (NSS_CMP ("unix"))
scheme[idx].method = NSS_SCHEME_UNIX;
else if (NSS_CMP ("desc"))
scheme[idx].method = NSS_SCHEME_DESC;
else if (NSS_CMP ("env"))
scheme[idx].method = NSS_SCHEME_ENV;
else if (NSS_NCMP ("/"))
{
const char *e = c + strcspn (c, " \t");
scheme[idx].method = NSS_SCHEME_PATH;
sys_mbstowcs_alloc (&scheme[idx].attrib, HEAP_STR,
c, e - c);
}
else if (NSS_NCMP ("@") && isalnum ((unsigned) *++c))
{
const char *e = c + strcspn (c, " \t");
scheme[idx].method = NSS_SCHEME_FREEATTR;
sys_mbstowcs_alloc (&scheme[idx].attrib, HEAP_STR,
c, e - c);
}
else
debug_printf ("Invalid nsswitch.conf content: %s", line);
c += strcspn (c, " \t");
c += strspn (c, " \t");
++idx;
}
/* If nothing has been set, revert to default. */
if (scheme[0].method == NSS_SCHEME_FALLBACK)
{
scheme[0].method = NSS_SCHEME_CYGWIN;
scheme[1].method = NSS_SCHEME_DESC;
}
}
}
break;
case '\0':
break;
default:
debug_printf ("Invalid nsswitch.conf content: %s", line);
break;
}
}
static char *
fetch_windows_home (cyg_ldap *pldap, PUSER_INFO_3 ui, cygpsid &sid,
PCWSTR dnsdomain)
{
PCWSTR home_from_db = NULL;
char *home = NULL;
if (pldap)
{
if (pldap->fetch_ad_account (sid, false, dnsdomain))
{
#if 0
/* Disable preferring homeDrive for now. The drive letter may not
be available when it's needed. */
home_from_db = pldap->get_string_attribute (L"homeDrive");
if (!home_from_db || !*home_from_db)
#endif
home_from_db = pldap->get_string_attribute (L"homeDirectory");
}
}
else if (ui)
{
#if 0
/* Ditto. */
if (ui->usri3_home_dir_drive && *ui->usri3_home_dir_drive)
home_from_db = ui->usri3_home_dir_drive;
else
#endif
if (ui->usri3_home_dir && *ui->usri3_home_dir)
home_from_db = ui->usri3_home_dir;
}
if (home_from_db && *home_from_db)
home = (char *) cygwin_create_path (CCP_WIN_W_TO_POSIX, home_from_db);
else
{
/* The db fields are empty, so we have to evaluate the local profile
path, which is the same thing as the default home directory on
Windows. So what we do here is to try to find out if the user
already has a profile on this machine.
Note that we don't try to generate the profile if it doesn't exist.
Think what would happen if we actually have the permissions to do
so and call getpwent... in a domain environment. The problem is,
of course, that we can't know the profile path, unless the OS
created it.
The only reason this could occur is if a user account, which never
logged on to the machine before, tries to logon via a Cygwin service
like sshd. */
WCHAR profile[MAX_PATH];
WCHAR sidstr[128];
if (get_user_profile_directory (sid.string (sidstr), profile, MAX_PATH))
home = (char *) cygwin_create_path (CCP_WIN_W_TO_POSIX, profile);
}
return home;
}
/* Local SAM accounts have only a handful attributes available to home users.
Therefore, allow to fetch additional passwd/group attributes from the
"Comment" field in XML short style. For symmetry, this is also allowed
from the equivalent "description" AD attribute. */
static char *
fetch_from_description (PCWSTR desc, PCWSTR search, size_t len)
{
PWCHAR s, e;
char *ret = NULL;
if ((s = wcsstr (desc, L"<cygwin ")) && (e = wcsstr (s + 8, L"/>")))
{
s += 8;
while (s && s < e)
{
while (*s == L' ')
++s;
if (!wcsncmp (s, search, len)) /* Found what we're searching? */
{
s += len;
if ((e = wcschr (s, L'"')))
{
sys_wcstombs_alloc (&ret, HEAP_NOTHEAP, s, e - s);
s = e + 1;
}
break;
}
else /* Skip the current foo="bar" string. */
if ((s = wcschr (s, L'"')) && (s = wcschr (s + 1, L'"')))
++s;
}
}
return ret;
}
static char *
fetch_from_path (cyg_ldap *pldap, PUSER_INFO_3 ui, cygpsid &sid, PCWSTR str,
PCWSTR dom, PCWSTR dnsdomain, PCWSTR name, bool full_qualified)
{
tmp_pathbuf tp;
PWCHAR wpath = tp.w_get ();
PWCHAR w = wpath;
PWCHAR we = wpath + NT_MAX_PATH - 1;
char *home;
char *ret = NULL;
while (*str && w < we)
{
if (*str != L'%')
*w++ = *str++;
else
{
switch (*++str)
{
case L'u':
if (full_qualified)
{
w = wcpncpy (w, dom, we - w);
if (w < we)
*w++ = cygheap->pg.nss_separator ()[0];
}
w = wcpncpy (w, name, we - w);
break;
case L'U':
w = wcpncpy (w, name, we - w);
break;
case L'D':
w = wcpncpy (w, dom, we - w);
break;
case L'H':
home = fetch_windows_home (pldap, ui, sid, dnsdomain);
if (home)
{
/* Drop one leading slash to accommodate home being an
absolute path. We don't check for broken usage of
%H here, of course. */
if (w > wpath && w[-1] == L'/')
--w;
w += sys_mbstowcs (w, we - w, home) - 1;
free (home);
}
break;
case L'_':
*w++ = L' ';
break;
default:
*w++ = *str;
break;
}
++str;
}
}
*w = L'\0';
sys_wcstombs_alloc (&ret, HEAP_NOTHEAP, wpath);
return ret;
}
static char *
fetch_home_env (void)
{
char *env = getenv("HOME"), *buf = NULL, *home = NULL;
tmp_pathbuf tp;
if (!env)
{
char *drive = getenv("HOMEDRIVE"), *path = getenv("HOMEPATH");
if (drive && path)
{
int drive_len = strlen(drive), path_len = strlen(path);
buf = (char *)malloc(drive_len + path_len + 1);
strcpy(buf, drive);
strcpy(buf + drive_len, path);
}
}
if (!buf && !env)
env = getenv("USERPROFILE");
if (env || buf)
{
cygwin_conv_path (CCP_WIN_A_TO_POSIX | CCP_ABSOLUTE,
env ? env : buf, tp.c_get(), NT_MAX_PATH);
free(buf);
home = strdup(tp.c_get());