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glibc/hurd/lookup-retry.c
Flavio Cruz e42ce0f45e Fix O_DIRECTORY lookup on trivial translators 
* hurd/lookup-retry.c (__hurd_file_name_lookup_retry): Do not remove
leading slash when `file_name' is "/".
2016-01-13 00:48:30 +01:00

332 lines
9.0 KiB
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/* hairy bits of Hurd file name lookup
Copyright (C) 1992-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <hurd.h>
#include <hurd/lookup.h>
#include <hurd/term.h>
#include <hurd/paths.h>
#include <limits.h>
#include <fcntl.h>
#include <string.h>
#include <_itoa.h>
#include <eloop-threshold.h>
/* Translate the error from dir_lookup into the error the user sees. */
static inline error_t
lookup_error (error_t error)
{
switch (error)
{
case EOPNOTSUPP:
case MIG_BAD_ID:
/* These indicate that the server does not understand dir_lookup
at all. If it were a directory, it would, by definition. */
return ENOTDIR;
default:
return error;
}
}
error_t
__hurd_file_name_lookup_retry (error_t (*use_init_port)
(int which, error_t (*operate) (file_t)),
file_t (*get_dtable_port) (int fd),
error_t (*lookup)
(file_t dir, char *name,
int flags, mode_t mode,
retry_type *do_retry, string_t retry_name,
mach_port_t *result),
enum retry_type doretry,
char retryname[1024],
int flags, mode_t mode,
file_t *result)
{
error_t err;
char *file_name;
int nloops;
error_t lookup_op (file_t startdir)
{
if (file_name[0] == '/' && file_name[1] != '\0')
{
while (file_name[1] == '/')
/* Remove double leading slash. */
file_name++;
if (file_name[1] != '\0')
/* Remove leading slash when we have more than the slash. */
file_name++;
}
return lookup_error ((*lookup) (startdir, file_name, flags, mode,
&doretry, retryname, result));
}
error_t reauthenticate (file_t unauth)
{
error_t err;
mach_port_t ref = __mach_reply_port ();
error_t reauth (auth_t auth)
{
return __auth_user_authenticate (auth, ref,
MACH_MSG_TYPE_MAKE_SEND,
result);
}
err = __io_reauthenticate (unauth, ref, MACH_MSG_TYPE_MAKE_SEND);
if (! err)
err = (*use_init_port) (INIT_PORT_AUTH, &reauth);
__mach_port_destroy (__mach_task_self (), ref);
__mach_port_deallocate (__mach_task_self (), unauth);
return err;
}
if (! lookup)
lookup = __dir_lookup;
nloops = 0;
err = 0;
do
{
file_t startdir = MACH_PORT_NULL;
int dirport = INIT_PORT_CWDIR;
switch (doretry)
{
case FS_RETRY_REAUTH:
if (err = reauthenticate (*result))
return err;
/* Fall through. */
case FS_RETRY_NORMAL:
if (nloops++ >= __eloop_threshold ())
{
__mach_port_deallocate (__mach_task_self (), *result);
return ELOOP;
}
/* An empty RETRYNAME indicates we have the final port. */
if (retryname[0] == '\0' &&
/* If reauth'd, we must do one more retry on "" to give the new
translator a chance to make a new port for us. */
doretry == FS_RETRY_NORMAL)
{
if (flags & O_NOFOLLOW)
{
/* In Linux, O_NOFOLLOW means to reject symlinks. If we
did an O_NOLINK lookup above and io_stat here to check
for S_IFLNK, a translator like firmlink could easily
spoof this check by not showing S_IFLNK, but in fact
redirecting the lookup to some other name
(i.e. opening the very same holes a symlink would).
Instead we do an O_NOTRANS lookup above, and stat the
underlying node: if it has a translator set, and its
owner is not root (st_uid 0) then we reject it.
Since the motivation for this feature is security, and
that security presumes we trust the containing
directory, this check approximates the security of
refusing symlinks while accepting mount points.
Note that we actually permit something Linux doesn't:
we follow root-owned symlinks; if that is deemed
undesireable, we can add a final check for that
one exception to our general translator-based rule. */
struct stat64 st;
err = __io_stat (*result, &st);
if (!err
&& (st.st_mode & (S_IPTRANS|S_IATRANS)))
{
if (st.st_uid != 0)
err = ENOENT;
else if (st.st_mode & S_IPTRANS)
{
char buf[1024];
char *trans = buf;
size_t translen = sizeof buf;
err = __file_get_translator (*result,
&trans, &translen);
if (!err
&& translen > sizeof _HURD_SYMLINK
&& !memcmp (trans,
_HURD_SYMLINK, sizeof _HURD_SYMLINK))
err = ENOENT;
}
}
}
/* We got a successful translation. Now apply any open-time
action flags we were passed. */
if (!err && (flags & O_TRUNC)) /* Asked to truncate the file. */
err = __file_set_size (*result, 0);
if (err)
__mach_port_deallocate (__mach_task_self (), *result);
return err;
}
startdir = *result;
file_name = retryname;
break;
case FS_RETRY_MAGICAL:
switch (retryname[0])
{
case '/':
dirport = INIT_PORT_CRDIR;
if (*result != MACH_PORT_NULL)
__mach_port_deallocate (__mach_task_self (), *result);
if (nloops++ >= __eloop_threshold ())
return ELOOP;
file_name = &retryname[1];
break;
case 'f':
if (retryname[1] == 'd' && retryname[2] == '/')
{
int fd;
char *end;
int save = errno;
errno = 0;
fd = (int) __strtoul_internal (&retryname[3], &end, 10, 0);
if (end == NULL || errno || /* Malformed number. */
/* Check for excess text after the number. A slash
is valid; it ends the component. Anything else
does not name a numeric file descriptor. */
(*end != '/' && *end != '\0'))
{
errno = save;
return ENOENT;
}
if (! get_dtable_port)
err = EGRATUITOUS;
else
{
*result = (*get_dtable_port) (fd);
if (*result == MACH_PORT_NULL)
{
/* If the name was a proper number, but the file
descriptor does not exist, we return EBADF instead
of ENOENT. */
err = errno;
errno = save;
}
}
errno = save;
if (err)
return err;
if (*end == '\0')
return 0;
else
{
/* Do a normal retry on the remaining components. */
startdir = *result;
file_name = end + 1; /* Skip the slash. */
break;
}
}
else
goto bad_magic;
break;
case 'm':
if (retryname[1] == 'a' && retryname[2] == 'c' &&
retryname[3] == 'h' && retryname[4] == 't' &&
retryname[5] == 'y' && retryname[6] == 'p' &&
retryname[7] == 'e')
{
error_t err;
struct host_basic_info hostinfo;
mach_msg_type_number_t hostinfocnt = HOST_BASIC_INFO_COUNT;
char *p;
/* XXX want client's host */
if (err = __host_info (__mach_host_self (), HOST_BASIC_INFO,
(integer_t *) &hostinfo,
&hostinfocnt))
return err;
if (hostinfocnt != HOST_BASIC_INFO_COUNT)
return EGRATUITOUS;
p = _itoa (hostinfo.cpu_subtype, &retryname[8], 10, 0);
*--p = '/';
p = _itoa (hostinfo.cpu_type, &retryname[8], 10, 0);
if (p < retryname)
abort (); /* XXX write this right if this ever happens */
if (p > retryname)
strcpy (retryname, p);
startdir = *result;
}
else
goto bad_magic;
break;
case 't':
if (retryname[1] == 't' && retryname[2] == 'y')
switch (retryname[3])
{
error_t opentty (file_t *result)
{
error_t err;
error_t ctty_open (file_t port)
{
if (port == MACH_PORT_NULL)
return ENXIO; /* No controlling terminal. */
return __termctty_open_terminal (port,
flags,
result);
}
err = (*use_init_port) (INIT_PORT_CTTYID, &ctty_open);
if (! err)
err = reauthenticate (*result);
return err;
}
case '\0':
return opentty (result);
case '/':
if (err = opentty (&startdir))
return err;
strcpy (retryname, &retryname[4]);
break;
default:
goto bad_magic;
}
else
goto bad_magic;
break;
default:
bad_magic:
return EGRATUITOUS;
}
break;
default:
return EGRATUITOUS;
}
if (startdir != MACH_PORT_NULL)
{
err = lookup_op (startdir);
__mach_port_deallocate (__mach_task_self (), startdir);
startdir = MACH_PORT_NULL;
}
else
err = (*use_init_port) (dirport, &lookup_op);
} while (! err);
return err;
}
weak_alias (__hurd_file_name_lookup_retry, hurd_file_name_lookup_retry)
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