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* syscalls.cc (seteuid): Set environment variables USERNAME and 

USERDOMAIN before impersonation to workaround a LookupAccountSid()
        misbehaviour.
        * uinfo.cc (internal_getlogin): Revert most of the previous change.
        Don't set environment variables USERNAME and USERDOMAIN. That's
        the job of seteuid() now. Try to get logon server from Lsa
        only if logon server isn't already known.
This commit is contained in:
Corinna Vinschen 2001-06-09 21:25:55 +00:00
parent 41476ab0bd
commit d4217d5680
3 changed files with 184 additions and 83 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,13 @@
Sat Jun 9 23:20:00 2001 Corinna Vinschen <corinna@vinschen.de>
* syscalls.cc (seteuid): Set environment variables USERNAME and
USERDOMAIN before impersonation to workaround a LookupAccountSid()
misbehaviour.
* uinfo.cc (internal_getlogin): Revert most of the previous change.
Don't set environment variables USERNAME and USERDOMAIN. That's
the job of seteuid() now. Try to get logon server from Lsa
only if logon server isn't already known.
Thu Jun 7 15:54:32 2001 Robert Collins <rbtcollins@hotmail.com>
* thread.cc (pthread_cond::Broadcast): Don't print error messages on

52
winsup/cygwin/syscalls.cc
View File

@ -22,6 +22,7 @@ details. */
#include <errno.h>
#include <limits.h>
#include <winnls.h>
#include <wininet.h>
#include <lmcons.h> /* for UNLEN */
#include <cygwin/version.h>
#include <sys/cygwin.h>
@ -1971,6 +1972,14 @@ seteuid (uid_t uid)
sigframe thisframe (mainthread);
if (os_being_run == winNT)
{
char orig_username[UNLEN + 1];
char orig_domain[INTERNET_MAX_HOST_NAME_LENGTH + 1];
char username[UNLEN + 1];
DWORD ulen = UNLEN + 1;
char domain[INTERNET_MAX_HOST_NAME_LENGTH + 1];
DWORD dlen = INTERNET_MAX_HOST_NAME_LENGTH + 1;
SID_NAME_USE use;
if (uid == (uid_t) -1 || uid == myself->uid)
{
debug_printf ("new euid == current euid, nothing happens");
@ -1983,18 +1992,44 @@ seteuid (uid_t uid)
return -1;
}
cygsid tok_usersid;
DWORD siz;
char *env;
orig_username[0] = orig_domain[0] = '\0';
if ((env = getenv ("USERNAME")))
strncat (orig_username, env, UNLEN + 1);
if ((env = getenv ("USERDOMAIN")))
strncat (orig_domain, env, INTERNET_MAX_HOST_NAME_LENGTH + 1);
if (uid == cygheap->user.orig_uid)
{
debug_printf ("RevertToSelf () (uid == orig_uid, token=%d)",
cygheap->user.token);
RevertToSelf ();
if (cygheap->user.token != INVALID_HANDLE_VALUE)
cygheap->user.impersonated = FALSE;
HANDLE ptok = INVALID_HANDLE_VALUE;
if (!OpenProcessToken (GetCurrentProcess (), TOKEN_QUERY, &ptok))
debug_printf ("OpenProcessToken(): %E\n");
else if (!GetTokenInformation (ptok, TokenUser, &tok_usersid,
sizeof tok_usersid, &siz))
debug_printf ("GetTokenInformation(): %E");
else if (!LookupAccountSid (NULL, tok_usersid, username, &ulen,
domain, &dlen, &use))
debug_printf ("LookupAccountSid(): %E");
else
{
setenv ("USERNAME", username, 1);
setenv ("USERDOMAIN", domain, 1);
}
if (ptok != INVALID_HANDLE_VALUE)
CloseHandle (ptok);
}
else
{
cygsid usersid, pgrpsid, tok_usersid, tok_pgrpsid;
DWORD siz;
cygsid usersid, pgrpsid, tok_pgrpsid;
HANDLE sav_token = INVALID_HANDLE_VALUE;
BOOL sav_impersonation;
BOOL current_token_is_internal_token = FALSE;
@ -2104,11 +2139,18 @@ seteuid (uid_t uid)
}
/* Now try to impersonate. */
if (!ImpersonateLoggedOnUser (cygheap->user.token))
if (!LookupAccountSid (NULL, usersid, username, &ulen,
domain, &dlen, &use))
debug_printf ("LookupAccountSid (): %E");
else if (!ImpersonateLoggedOnUser (cygheap->user.token))
system_printf ("Impersonating (%d) in set(e)uid failed: %E",
cygheap->user.token);
else
cygheap->user.impersonated = TRUE;
{
cygheap->user.impersonated = TRUE;
setenv ("USERNAME", username, 1);
setenv ("USERDOMAIN", domain, 1);
}
}
}
@ -2124,6 +2166,8 @@ seteuid (uid_t uid)
debug_printf ("Diffs!!! token: %d, cur: %d, new: %d, orig: %d",
cygheap->user.token, pw_cur->pw_uid,
pw_new->pw_uid, cygheap->user.orig_uid);
setenv ("USERNAME", orig_username, 1);
setenv ("USERDOMAIN", orig_domain, 1);
set_errno (EPERM);
return -1;
}

205
winsup/cygwin/uinfo.cc
View File

@ -31,61 +31,61 @@ struct passwd *
internal_getlogin (cygheap_user &user)
{
char username[UNLEN + 1];
DWORD ulen = UNLEN + 1;
DWORD username_len = UNLEN + 1;
struct passwd *pw = NULL;
if (!GetUserName (username, &ulen))
if (!GetUserName (username, &username_len))
user.set_name ("unknown");
else
user.set_name (username);
debug_printf ("GetUserName() = %s", user.name ());
if (os_being_run == winNT)
{
HANDLE ptok = user.token; /* Which is INVALID_HANDLE_VALUE if no
impersonation took place. */
DWORD siz;
cygsid tu;
NET_API_STATUS ret = 0;
char domain[INTERNET_MAX_HOST_NAME_LENGTH + 1];
DWORD dlen = INTERNET_MAX_HOST_NAME_LENGTH + 1;
SID_NAME_USE use;
char buf[MAX_PATH];
LPWKSTA_USER_INFO_1 wui;
NET_API_STATUS ret;
char buf[512];
char *env;
/* Try to get the SID either from already impersonated token
or from current process first. To differ that two cases is
important, because you can't rely on the user information
in a process token of a currently impersonated process. */
user.set_sid (NO_SID);
if (ptok == INVALID_HANDLE_VALUE
&& !OpenProcessToken (GetCurrentProcess (),
TOKEN_ADJUST_DEFAULT | TOKEN_QUERY,
&ptok))
debug_printf ("OpenProcessToken(): %E");
else if (!GetTokenInformation (ptok, TokenUser, &tu, sizeof tu, &siz))
debug_printf ("GetTokenInformation(): %E");
else if (!(ret = user.set_sid (tu)))
debug_printf ("Couldn't retrieve SID from access token!");
else if (!LookupAccountSid (NULL, user.sid (), username, &ulen,
domain, &dlen, &use))
debug_printf ("LookupAccountSid (): %E");
else
user.set_logsrv (NULL);
/* First trying to get logon info from environment */
if ((env = getenv ("USERNAME")) != NULL)
user.set_name (env);
if ((env = getenv ("USERDOMAIN")) != NULL)
user.set_domain (env);
if ((env = getenv ("LOGONSERVER")) != NULL)
user.set_logsrv (env + 2); /* filter leading double backslashes */
if (user.name () && user.domain ())
debug_printf ("User: %s, Domain: %s, Logon Server: %s",
user.name (), user.domain (), user.logsrv ());
else if (!(ret = NetWkstaUserGetInfo (NULL, 1, (LPBYTE *)&wui)))
{
user.set_name (username);
user.set_domain (domain);
sys_wcstombs (buf, wui->wkui1_username, UNLEN + 1);
user.set_name (buf);
sys_wcstombs (buf, wui->wkui1_logon_server,
INTERNET_MAX_HOST_NAME_LENGTH + 1);
user.set_logsrv (buf);
sys_wcstombs (buf, wui->wkui1_logon_domain,
INTERNET_MAX_HOST_NAME_LENGTH + 1);
user.set_domain (buf);
NetApiBufferFree (wui);
}
if (!user.logsrv () && get_logon_server_and_user_domain (buf, NULL))
{
user.set_logsrv (buf + 2);
setenv ("LOGONSERVER", buf, 1);
}
if (get_logon_server_and_user_domain (domain, NULL))
user.set_logsrv (domain + 2);
setenv ("USERNAME", user.name (), 1);
setenv ("LOGONSERVER", user.logsrv (), 1);
setenv ("USERDOMAIN", user.domain (), 1);
LPUSER_INFO_3 ui;
WCHAR wlogsrv[INTERNET_MAX_HOST_NAME_LENGTH + 1];
LPUSER_INFO_3 ui = NULL;
WCHAR wuser[UNLEN + 1];
sys_mbstowcs (wlogsrv, user.logsrv (), INTERNET_MAX_HOST_NAME_LENGTH + 1);
WCHAR wlogsrv[INTERNET_MAX_HOST_NAME_LENGTH + 3];
/* HOMEDRIVE and HOMEPATH are wrong most of the time, too,
after changing user context! */
sys_mbstowcs (wuser, user.name (), UNLEN + 1);
if (!NetUserGetInfo (wlogsrv, wuser, 3, (LPBYTE *)&ui) ||
!NetUserGetInfo (NULL, wuser, 3, (LPBYTE *)&ui))
strcat (strcpy (buf, "\\\\"), user.logsrv ());
sys_mbstowcs (wlogsrv, buf, INTERNET_MAX_HOST_NAME_LENGTH + 3);
if (!NetUserGetInfo (NULL, wuser, 3, (LPBYTE *)&ui)
|| !NetUserGetInfo (wlogsrv, wuser, 3,(LPBYTE *)&ui))
{
sys_wcstombs (buf, ui->usri3_home_dir, MAX_PATH);
if (!buf[0])
@ -95,7 +95,7 @@ internal_getlogin (cygheap_user &user)
strcat (buf, "\\");
else
{
char *env = getenv ("SYSTEMDRIVE");
env = getenv ("SYSTEMDRIVE");
if (env && *env)
strcat (strcpy (buf, env), "\\");
else
@ -107,46 +107,93 @@ internal_getlogin (cygheap_user &user)
setenv ("HOMEDRIVE", buf, 1);
NetApiBufferFree (ui);
}
debug_printf ("Domain: %s, Logon Server: %s, Windows Username: %s",
user.domain (), user.logsrv (), user.name ());
/* If we have a SID, try to get the corresponding Cygwin user name
which can be different from the Windows user name. */
cygsid gsid (NO_SID);
if (user.sid ())
if (allow_ntsec)
{
cygsid psid;
HANDLE ptok = user.token; /* Which is INVALID_HANDLE_VALUE if no
impersonation took place. */
DWORD siz;
cygsid tu;
int ret = 0;
for (int pidx = 0; (pw = internal_getpwent (pidx)); ++pidx)
if (psid.getfrompw (pw) && EqualSid (user.sid (), psid))
{
user.set_name (pw->pw_name);
struct group *gr = getgrgid (pw->pw_gid);
if (gr && !gsid.getfromgr (gr))
gsid = NO_SID;
}
if (!strcasematch (user.name (), "SYSTEM"))
if (get_registry_hive_path (user.sid (), buf))
setenv ("USERPROFILE", buf, 1);
else
unsetenv ("USERPROFILE");
/* Try to get the SID either from already impersonated token
or from current process first. To differ that two cases is
important, because you can't rely on the user information
in a process token of a currently impersonated process. */
if (ptok == INVALID_HANDLE_VALUE
&& !OpenProcessToken (GetCurrentProcess (),
TOKEN_ADJUST_DEFAULT | TOKEN_QUERY,
&ptok))
debug_printf ("OpenProcessToken(): %E\n");
else if (!GetTokenInformation (ptok, TokenUser, &tu, sizeof tu, &siz))
debug_printf ("GetTokenInformation(): %E");
else if (!(ret = user.set_sid (tu)))
debug_printf ("Couldn't retrieve SID from access token!");
/* If that failes, try to get the SID from localhost. This can only
be done if a domain is given because there's a chance that a local
and a domain user may have the same name. */
if (!ret && user.domain ())
{
/* Concat DOMAIN\USERNAME for the next lookup */
strcat (strcat (strcpy (buf, user.domain ()), "\\"), user.name ());
if (!(ret = lookup_name (buf, NULL, user.sid ())))
debug_printf ("Couldn't retrieve SID locally!");
}
/* If that fails, too, as a last resort try to get the SID from
the logon server. */
if (!ret && !(ret = lookup_name (user.name (), user.logsrv (),
user.sid ())))
debug_printf ("Couldn't retrieve SID from '%s'!", user.logsrv ());
/* If we have a SID, try to get the corresponding Cygwin user name
which can be different from the Windows user name. */
cygsid gsid (NO_SID);
if (ret)
{
char dom[INTERNET_MAX_HOST_NAME_LENGTH + 1];
cygsid psid;
for (int pidx = 0; (pw = internal_getpwent (pidx)); ++pidx)
if (psid.getfrompw (pw) && EqualSid (user.sid (), psid))
{
user.set_name (pw->pw_name);
struct group *gr = getgrgid (pw->pw_gid);
if (gr)
if (!gsid.getfromgr (gr))
gsid = NO_SID;
break;
}
if (!strcasematch (user.name (), "SYSTEM")
&& user.domain () && user.logsrv ())
{
if (get_registry_hive_path (user.sid (), buf))
setenv ("USERPROFILE", buf, 1);
else
unsetenv ("USERPROFILE");
}
}
/* If this process is started from a non Cygwin process,
set token owner to the same value as token user and
primary group to the group which is set as primary group
in /etc/passwd. */
if (ptok != INVALID_HANDLE_VALUE && myself->ppid == 1)
{
if (!SetTokenInformation (ptok, TokenOwner, &tu, sizeof tu))
debug_printf ("SetTokenInformation(TokenOwner): %E");
if (gsid && !SetTokenInformation (ptok, TokenPrimaryGroup,
&gsid, sizeof gsid))
debug_printf ("SetTokenInformation(TokenPrimaryGroup): %E");
}
/* Close token only if it's a result from OpenProcessToken(). */
if (ptok != INVALID_HANDLE_VALUE
&& user.token == INVALID_HANDLE_VALUE)
CloseHandle (ptok);
}
/* If this process is started from a non Cygwin process,
set token owner to the same value as token user and
primary group to the group which is set as primary group
in /etc/passwd. */
if (ptok != INVALID_HANDLE_VALUE && myself->ppid == 1)
{
if (!SetTokenInformation (ptok, TokenOwner, &tu, sizeof tu))
debug_printf ("SetTokenInformation(TokenOwner): %E");
if (gsid && !SetTokenInformation (ptok, TokenPrimaryGroup,
&gsid, sizeof gsid))
debug_printf ("SetTokenInformation(TokenPrimaryGroup): %E");
}
/* Close token only if it's a result from OpenProcessToken(). */
if (ptok != INVALID_HANDLE_VALUE
&& user.token == INVALID_HANDLE_VALUE)
CloseHandle (ptok);
}
debug_printf ("Cygwins Username: %s", user.name ());
return pw ?: getpwnam(user.name ());