c849849d06
incorrectly when encountering `large' groups (many members and/or many long member names). The reporter tracked this down to the glibc NSS module compatibility code (nss_compat.c): it would prematurely record that a NSS module was finished iterating through its database in some cases. Two aspects are corrected: 1. nss_compat.c recorded that a NSS module was finished iterating whenever the module reported something other than SUCCESS. The correct logic is to continue iteration when the module reports either SUCCESS or RETURN. The __nss_compat_getgrent_r and __nss_compat_getpwent_r routines are updated to reflect this. 2. An internal helper macro __nss_compat_result is used to map glibc NSS status codes to BSD NSS status codes (e.g. NSS_STATUS_SUCCESS -> NS_SUCCESS). It provided the obvious mapping. When a NSS routine is called with a too-small buffer, the convention in the BSD NSS code is to report RETURN. (This is used to implement reentrant APIs such as getpwnam_r(3).) However, the convention in glibc for this case is to set errno = ERANGE and overload TRYAGAIN. __nss_compat_result is updated to handle this case. PR: bin/60287 Reported by: Lachlan O'Dea <odela01@ca.com>
278 lines
7.0 KiB
C
278 lines
7.0 KiB
C
/*-
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* Copyright (c) 2003 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by
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* Jacques A. Vidrine, Safeport Network Services, and Network
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* Associates Laboratories, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
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* ("CBOSS"), as part of the DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Compatibility shims for the GNU C Library-style nsswitch interface.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <sys/param.h>
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#include <errno.h>
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#include <nss.h>
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#include <pthread.h>
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#include <pthread_np.h>
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#include "un-namespace.h"
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struct group;
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struct passwd;
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static int terminator;
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#define DECLARE_TERMINATOR(x) \
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static pthread_key_t _term_key_##x; \
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static void \
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_term_create_##x(void) \
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{ \
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(void)_pthread_key_create(&_term_key_##x, NULL); \
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} \
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static void *_term_main_##x; \
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static pthread_once_t _term_once_##x = PTHREAD_ONCE_INIT
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#define SET_TERMINATOR(x, y) \
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do { \
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if (_pthread_main_np()) \
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_term_main_##x = (y); \
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else { \
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(void)_pthread_once(&_term_once_##x, _term_create_##x); \
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(void)_pthread_setspecific(_term_key_##x, y); \
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} \
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} while (0)
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#define CHECK_TERMINATOR(x) \
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(_pthread_main_np() ? \
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(_term_main_##x) : \
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((void)_pthread_once(&_term_once_##x, _term_create_##x), \
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_pthread_getspecific(_term_key_##x)))
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DECLARE_TERMINATOR(group);
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int
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__nss_compat_getgrnam_r(void *retval, void *mdata, va_list ap)
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{
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int (*fn)(const char *, struct group *, char *, size_t, int *);
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const char *name;
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struct group *grp;
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char *buffer;
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int *errnop;
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size_t bufsize;
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enum nss_status status;
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fn = mdata;
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name = va_arg(ap, const char *);
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grp = va_arg(ap, struct group *);
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buffer = va_arg(ap, char *);
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bufsize = va_arg(ap, size_t);
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errnop = va_arg(ap, int *);
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status = fn(name, grp, buffer, bufsize, errnop);
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status = __nss_compat_result(status, *errnop);
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if (status == NS_SUCCESS)
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*(struct group **)retval = grp;
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return (status);
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}
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int
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__nss_compat_getgrgid_r(void *retval, void *mdata, va_list ap)
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{
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int (*fn)(gid_t, struct group *, char *, size_t, int *);
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gid_t gid;
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struct group *grp;
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char *buffer;
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int *errnop;
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size_t bufsize;
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enum nss_status status;
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fn = mdata;
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gid = va_arg(ap, gid_t);
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grp = va_arg(ap, struct group *);
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buffer = va_arg(ap, char *);
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bufsize = va_arg(ap, size_t);
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errnop = va_arg(ap, int *);
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status = fn(gid, grp, buffer, bufsize, errnop);
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status = __nss_compat_result(status, *errnop);
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if (status == NS_SUCCESS)
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*(struct group **)retval = grp;
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return (status);
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}
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int
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__nss_compat_getgrent_r(void *retval, void *mdata, va_list ap)
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{
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int (*fn)(struct group *, char *, size_t, int *);
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struct group *grp;
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char *buffer;
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int *errnop;
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size_t bufsize;
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enum nss_status status;
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if (CHECK_TERMINATOR(group))
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return (NS_NOTFOUND);
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fn = mdata;
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grp = va_arg(ap, struct group *);
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buffer = va_arg(ap, char *);
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bufsize = va_arg(ap, size_t);
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errnop = va_arg(ap, int *);
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status = fn(grp, buffer, bufsize, errnop);
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status = __nss_compat_result(status, *errnop);
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if (status == NS_SUCCESS)
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*(struct group **)retval = grp;
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else if (status != NS_RETURN)
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SET_TERMINATOR(group, &terminator);
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return (status);
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}
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int
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__nss_compat_setgrent(void *retval, void *mdata, va_list ap)
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{
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SET_TERMINATOR(group, NULL);
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((int (*)(void))mdata)();
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return (NS_UNAVAIL);
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}
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int
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__nss_compat_endgrent(void *retval, void *mdata, va_list ap)
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{
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SET_TERMINATOR(group, NULL);
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((int (*)(void))mdata)();
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return (NS_UNAVAIL);
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}
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DECLARE_TERMINATOR(passwd);
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int
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__nss_compat_getpwnam_r(void *retval, void *mdata, va_list ap)
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{
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int (*fn)(const char *, struct passwd *, char *, size_t, int *);
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const char *name;
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struct passwd *pwd;
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char *buffer;
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int *errnop;
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size_t bufsize;
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enum nss_status status;
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fn = mdata;
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name = va_arg(ap, const char *);
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pwd = va_arg(ap, struct passwd *);
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buffer = va_arg(ap, char *);
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bufsize = va_arg(ap, size_t);
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errnop = va_arg(ap, int *);
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status = fn(name, pwd, buffer, bufsize, errnop);
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status = __nss_compat_result(status, *errnop);
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if (status == NS_SUCCESS)
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*(struct passwd **)retval = pwd;
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return (status);
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}
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int
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__nss_compat_getpwuid_r(void *retval, void *mdata, va_list ap)
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{
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int (*fn)(uid_t, struct passwd *, char *, size_t, int *);
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uid_t uid;
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struct passwd *pwd;
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char *buffer;
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int *errnop;
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size_t bufsize;
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enum nss_status status;
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fn = mdata;
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uid = va_arg(ap, uid_t);
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pwd = va_arg(ap, struct passwd *);
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buffer = va_arg(ap, char *);
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bufsize = va_arg(ap, size_t);
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errnop = va_arg(ap, int *);
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status = fn(uid, pwd, buffer, bufsize, errnop);
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status = __nss_compat_result(status, *errnop);
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if (status == NS_SUCCESS)
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*(struct passwd **)retval = pwd;
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return (status);
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}
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int
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__nss_compat_getpwent_r(void *retval, void *mdata, va_list ap)
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{
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int (*fn)(struct passwd *, char *, size_t, int *);
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struct passwd *pwd;
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char *buffer;
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int *errnop;
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size_t bufsize;
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enum nss_status status;
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if (CHECK_TERMINATOR(passwd))
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return (NS_NOTFOUND);
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fn = mdata;
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pwd = va_arg(ap, struct passwd *);
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buffer = va_arg(ap, char *);
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bufsize = va_arg(ap, size_t);
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errnop = va_arg(ap, int *);
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status = fn(pwd, buffer, bufsize, errnop);
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status = __nss_compat_result(status, *errnop);
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if (status == NS_SUCCESS)
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*(struct passwd **)retval = pwd;
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else if (status != NS_RETURN)
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SET_TERMINATOR(passwd, &terminator);
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return (status);
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}
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int
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__nss_compat_setpwent(void *retval, void *mdata, va_list ap)
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{
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SET_TERMINATOR(passwd, NULL);
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((int (*)(void))mdata)();
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return (NS_UNAVAIL);
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}
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int
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__nss_compat_endpwent(void *retval, void *mdata, va_list ap)
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{
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SET_TERMINATOR(passwd, NULL);
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((int (*)(void))mdata)();
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return (NS_UNAVAIL);
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}
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