glibc/nis/nss_nis/nis-pwd.c

582 lines
14 KiB
C

/* Copyright (C) 1996-2013 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1996.
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 <assert.h>
#include <ctype.h>
#include <errno.h>
#include <nss.h>
#include <pwd.h>
#include <string.h>
#include <bits/libc-lock.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>
#include "nss-nis.h"
#include <libnsl.h>
/* Get the declaration of the parser function. */
#define ENTNAME pwent
#define STRUCTURE passwd
#define EXTERN_PARSER
#include <nss/nss_files/files-parse.c>
/* Protect global state against multiple changers */
__libc_lock_define_initialized (static, lock)
static bool new_start = true;
static char *oldkey;
static int oldkeylen;
static intern_t intern;
int
_nis_saveit (int instatus, char *inkey, int inkeylen, char *inval,
int invallen, char *indata)
{
intern_t *intern = (intern_t *) indata;
if (instatus != YP_TRUE)
return 1;
if (inkey && inkeylen > 0 && inval && invallen > 0)
{
struct response_t *bucket = intern->next;
if (__builtin_expect (bucket == NULL, 0))
{
#define MINSIZE 4096 - 4 * sizeof (void *)
const size_t minsize = MAX (MINSIZE, 2 * (invallen + 1));
bucket = malloc (sizeof (struct response_t) + minsize);
if (bucket == NULL)
/* We have no error code for out of memory. */
return 1;
bucket->next = NULL;
bucket->size = minsize;
intern->start = intern->next = bucket;
intern->offset = 0;
}
else if (__builtin_expect (invallen + 1 > bucket->size - intern->offset,
0))
{
/* We need a new (larger) buffer. */
const size_t newsize = 2 * MAX (bucket->size, invallen + 1);
struct response_t *newp = malloc (sizeof (struct response_t)
+ newsize);
if (newp == NULL)
/* We have no error code for out of memory. */
return 1;
/* Mark the old bucket as full. */
bucket->size = intern->offset;
newp->next = NULL;
newp->size = newsize;
bucket = intern->next = bucket->next = newp;
intern->offset = 0;
}
char *p = mempcpy (&bucket->mem[intern->offset], inval, invallen);
if (__builtin_expect (p[-1] != '\0', 0))
{
*p = '\0';
++invallen;
}
intern->offset += invallen;
}
return 0;
}
static void
internal_nis_endpwent (void)
{
new_start = true;
free (oldkey);
oldkey = NULL;
oldkeylen = 0;
struct response_t *curr = intern.start;
while (curr != NULL)
{
struct response_t *last = curr;
curr = curr->next;
free (last);
}
intern.next = intern.start = NULL;
}
enum nss_status
_nss_nis_endpwent (void)
{
__libc_lock_lock (lock);
internal_nis_endpwent ();
__libc_lock_unlock (lock);
return NSS_STATUS_SUCCESS;
}
enum nss_status
internal_nis_setpwent (void)
{
/* We have to read all the data now. */
char *domain;
if (__builtin_expect (yp_get_default_domain (&domain), 0))
return NSS_STATUS_UNAVAIL;
struct ypall_callback ypcb;
ypcb.foreach = _nis_saveit;
ypcb.data = (char *) &intern;
enum nss_status status = yperr2nss (yp_all (domain, "passwd.byname", &ypcb));
/* Mark the last buffer as full. */
if (intern.next != NULL)
intern.next->size = intern.offset;
intern.next = intern.start;
intern.offset = 0;
return status;
}
enum nss_status
_nss_nis_setpwent (int stayopen)
{
enum nss_status result = NSS_STATUS_SUCCESS;
__libc_lock_lock (lock);
internal_nis_endpwent ();
if (_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ)
result = internal_nis_setpwent ();
__libc_lock_unlock (lock);
return result;
}
static enum nss_status
internal_nis_getpwent_r (struct passwd *pwd, char *buffer, size_t buflen,
int *errnop)
{
/* If we read the entire database at setpwent time we just iterate
over the data we have in memory. */
bool batch_read = intern.start != NULL;
char *domain = NULL;
if (!batch_read && __builtin_expect (yp_get_default_domain (&domain), 0))
return NSS_STATUS_UNAVAIL;
/* Get the next entry until we found a correct one. */
int parse_res;
do
{
char *result;
char *outkey;
int len;
int keylen;
if (batch_read)
{
struct response_t *bucket;
handle_batch_read:
bucket = intern.next;
if (__builtin_expect (intern.offset >= bucket->size, 0))
{
if (bucket->next == NULL)
return NSS_STATUS_NOTFOUND;
/* We look at all the content in the current bucket. Go on
to the next. */
bucket = intern.next = bucket->next;
intern.offset = 0;
}
for (result = &bucket->mem[intern.offset]; isspace (*result);
++result)
++intern.offset;
len = strlen (result);
}
else
{
int yperr;
if (new_start)
{
/* Maybe we should read the database in one piece. */
if ((_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ)
&& internal_nis_setpwent () == NSS_STATUS_SUCCESS
&& intern.start != NULL)
{
batch_read = true;
goto handle_batch_read;
}
yperr = yp_first (domain, "passwd.byname", &outkey, &keylen,
&result, &len);
}
else
yperr = yp_next (domain, "passwd.byname", oldkey, oldkeylen,
&outkey, &keylen, &result, &len);
if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
{
enum nss_status retval = yperr2nss (yperr);
if (retval == NSS_STATUS_TRYAGAIN)
*errnop = errno;
return retval;
}
}
/* Check for adjunct style secret passwords. They can be
recognized by a password starting with "##". We do not use
it if the passwd.adjunct.byname table is supposed to be used
as a shadow.byname replacement. */
char *p = strchr (result, ':');
size_t namelen;
char *result2;
int len2;
if ((_nsl_default_nss () & NSS_FLAG_ADJUNCT_AS_SHADOW) == 0
&& p != NULL /* This better should be true in all cases. */
&& p[1] == '#' && p[2] == '#'
&& (namelen = p - result,
yp_match (domain, "passwd.adjunct.byname", result, namelen,
&result2, &len2)) == YPERR_SUCCESS)
{
/* We found a passwd.adjunct.byname entry. Merge encrypted
password therein into original result. */
char *encrypted = strchr (result2, ':');
char *endp;
size_t restlen;
if (encrypted == NULL
|| (endp = strchr (++encrypted, ':')) == NULL
|| (p = strchr (p + 1, ':')) == NULL)
{
/* Invalid format of the entry. This never should happen
unless the data from which the NIS table is generated is
wrong. We simply ignore it. */
free (result2);
goto non_adjunct;
}
restlen = len - (p - result);
if (__builtin_expect ((size_t) (namelen + (endp - encrypted)
+ restlen + 2) > buflen, 0))
{
free (result2);
free (result);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
mempcpy (mempcpy (mempcpy (mempcpy (buffer, result, namelen),
":", 1),
encrypted, endp - encrypted),
p, restlen + 1);
p = buffer;
free (result2);
}
else
{
non_adjunct:
if (__builtin_expect ((size_t) (len + 1) > buflen, 0))
{
free (result);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
p = buffer;
*((char *) mempcpy (buffer, result, len)) = '\0';
}
while (isspace (*p))
++p;
if (!batch_read)
free (result);
parse_res = _nss_files_parse_pwent (p, pwd, (void *) buffer, buflen,
errnop);
if (__builtin_expect (parse_res == -1, 0))
{
if (!batch_read)
free (outkey);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
if (batch_read)
intern.offset += len + 1;
else
{
free (oldkey);
oldkey = outkey;
oldkeylen = keylen;
new_start = false;
}
}
while (parse_res < 1);
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nis_getpwent_r (struct passwd *result, char *buffer, size_t buflen,
int *errnop)
{
int status;
__libc_lock_lock (lock);
status = internal_nis_getpwent_r (result, buffer, buflen, errnop);
__libc_lock_unlock (lock);
return status;
}
enum nss_status
_nss_nis_getpwnam_r (const char *name, struct passwd *pwd,
char *buffer, size_t buflen, int *errnop)
{
if (name == NULL)
{
*errnop = EINVAL;
return NSS_STATUS_UNAVAIL;
}
char *domain;
if (__builtin_expect (yp_get_default_domain (&domain), 0))
return NSS_STATUS_UNAVAIL;
size_t namelen = strlen (name);
char *result;
int len;
int yperr = yp_match (domain, "passwd.byname", name, namelen, &result, &len);
if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
{
enum nss_status retval = yperr2nss (yperr);
if (retval == NSS_STATUS_TRYAGAIN)
*errnop = errno;
return retval;
}
/* Check for adjunct style secret passwords. They can be recognized
by a password starting with "##". We do not use it if the
passwd.adjunct.byname table is supposed to be used as a shadow.byname
replacement. */
char *result2;
int len2;
char *p = strchr (result, ':');
if ((_nsl_default_nss () & NSS_FLAG_ADJUNCT_AS_SHADOW) == 0
&& p != NULL /* This better should be true in all cases. */
&& p[1] == '#' && p[2] == '#'
&& yp_match (domain, "passwd.adjunct.byname", name, namelen,
&result2, &len2) == YPERR_SUCCESS)
{
/* We found a passwd.adjunct.byname entry. Merge encrypted password
therein into original result. */
char *encrypted = strchr (result2, ':');
char *endp;
if (encrypted == NULL
|| (endp = strchr (++encrypted, ':')) == NULL
|| (p = strchr (p + 1, ':')) == NULL)
{
/* Invalid format of the entry. This never should happen
unless the data from which the NIS table is generated is
wrong. We simply ignore it. */
free (result2);
goto non_adjunct;
}
size_t restlen = len - (p - result);
if (__builtin_expect ((size_t) (namelen + (endp - encrypted)
+ restlen + 2) > buflen, 0))
{
free (result2);
free (result);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
__mempcpy (__mempcpy (__mempcpy (__mempcpy (buffer, name, namelen),
":", 1),
encrypted, endp - encrypted),
p, restlen + 1);
p = buffer;
free (result2);
}
else
{
non_adjunct:
if (__builtin_expect ((size_t) (len + 1) > buflen, 0))
{
free (result);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
p = strncpy (buffer, result, len);
buffer[len] = '\0';
}
while (isspace (*p))
++p;
free (result);
int parse_res = _nss_files_parse_pwent (p, pwd, (void *) buffer, buflen,
errnop);
if (__builtin_expect (parse_res < 1, 0))
{
if (parse_res == -1)
return NSS_STATUS_TRYAGAIN;
else
return NSS_STATUS_NOTFOUND;
}
else
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nis_getpwuid_r (uid_t uid, struct passwd *pwd,
char *buffer, size_t buflen, int *errnop)
{
char *domain;
if (__builtin_expect (yp_get_default_domain (&domain), 0))
return NSS_STATUS_UNAVAIL;
char buf[32];
int nlen = snprintf (buf, sizeof (buf), "%lu", (unsigned long int) uid);
char *result;
int len;
int yperr = yp_match (domain, "passwd.byuid", buf, nlen, &result, &len);
if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
{
enum nss_status retval = yperr2nss (yperr);
if (retval == NSS_STATUS_TRYAGAIN)
*errnop = errno;
return retval;
}
/* Check for adjunct style secret passwords. They can be recognized
by a password starting with "##". We do not use it if the
passwd.adjunct.byname table is supposed to be used as a shadow.byname
replacement. */
char *result2;
int len2;
size_t namelen;
char *p = strchr (result, ':');
if ((_nsl_default_nss () & NSS_FLAG_ADJUNCT_AS_SHADOW) == 0
&& p != NULL /* This better should be true in all cases. */
&& p[1] == '#' && p[2] == '#'
&& (namelen = p - result,
yp_match (domain, "passwd.adjunct.byname", result, namelen,
&result2, &len2)) == YPERR_SUCCESS)
{
/* We found a passwd.adjunct.byname entry. Merge encrypted password
therein into original result. */
char *encrypted = strchr (result2, ':');
char *endp;
size_t restlen;
if (encrypted == NULL
|| (endp = strchr (++encrypted, ':')) == NULL
|| (p = strchr (p + 1, ':')) == NULL)
{
/* Invalid format of the entry. This never should happen
unless the data from which the NIS table is generated is
wrong. We simply ignore it. */
free (result2);
goto non_adjunct;
}
restlen = len - (p - result);
if (__builtin_expect ((size_t) (namelen + (endp - encrypted)
+ restlen + 2) > buflen, 0))
{
free (result2);
free (result);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
__mempcpy (__mempcpy (__mempcpy (__mempcpy (buffer, result, namelen),
":", 1),
encrypted, endp - encrypted),
p, restlen + 1);
p = buffer;
free (result2);
}
else
{
non_adjunct:
if (__builtin_expect ((size_t) (len + 1) > buflen, 0))
{
free (result);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
p = strncpy (buffer, result, len);
buffer[len] = '\0';
}
while (isspace (*p))
++p;
free (result);
int parse_res = _nss_files_parse_pwent (p, pwd, (void *) buffer, buflen,
errnop);
if (__builtin_expect (parse_res < 1, 0))
{
if (parse_res == -1)
return NSS_STATUS_TRYAGAIN;
else
return NSS_STATUS_NOTFOUND;
}
else
return NSS_STATUS_SUCCESS;
}