864 lines
21 KiB
C
864 lines
21 KiB
C
/* Copyright (C) 1996-2022 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <netdb.h>
|
|
#include <nss.h>
|
|
#include <nsswitch.h>
|
|
#include <shadow.h>
|
|
#include <stdio_ext.h>
|
|
#include <string.h>
|
|
#include <libc-lock.h>
|
|
#include <kernel-features.h>
|
|
#include <nss_files.h>
|
|
|
|
#include "netgroup.h"
|
|
#include "nisdomain.h"
|
|
|
|
NSS_DECLARE_MODULE_FUNCTIONS (compat)
|
|
|
|
static nss_action_list ni;
|
|
static enum nss_status (*setspent_impl) (int stayopen);
|
|
static enum nss_status (*getspnam_r_impl) (const char *name, struct spwd * sp,
|
|
char *buffer, size_t buflen,
|
|
int *errnop);
|
|
static enum nss_status (*getspent_r_impl) (struct spwd * sp, char *buffer,
|
|
size_t buflen, int *errnop);
|
|
static enum nss_status (*endspent_impl) (void);
|
|
|
|
/* Get the declaration of the parser function. */
|
|
#define ENTNAME spent
|
|
#define STRUCTURE spwd
|
|
#define EXTERN_PARSER
|
|
#include <nss/nss_files/files-parse.c>
|
|
|
|
/* Structure for remembering -@netgroup and -user members ... */
|
|
#define BLACKLIST_INITIAL_SIZE 512
|
|
#define BLACKLIST_INCREMENT 256
|
|
struct blacklist_t
|
|
{
|
|
char *data;
|
|
int current;
|
|
int size;
|
|
};
|
|
|
|
struct ent_t
|
|
{
|
|
bool netgroup;
|
|
bool files;
|
|
bool first;
|
|
enum nss_status setent_status;
|
|
FILE *stream;
|
|
struct blacklist_t blacklist;
|
|
struct spwd pwd;
|
|
struct __netgrent netgrdata;
|
|
};
|
|
typedef struct ent_t ent_t;
|
|
|
|
static ent_t ext_ent = { false, true, false, NSS_STATUS_SUCCESS, NULL,
|
|
{ NULL, 0, 0},
|
|
{ NULL, NULL, 0, 0, 0, 0, 0, 0, 0}};
|
|
|
|
/* Protect global state against multiple changers. */
|
|
__libc_lock_define_initialized (static, lock)
|
|
|
|
/* Prototypes for local functions. */
|
|
static void blacklist_store_name (const char *, ent_t *);
|
|
static bool in_blacklist (const char *, int, ent_t *);
|
|
|
|
/* Initialize the NSS interface/functions. The calling function must
|
|
hold the lock. */
|
|
static void
|
|
init_nss_interface (void)
|
|
{
|
|
if (__nss_database_get (nss_database_shadow_compat, &ni))
|
|
{
|
|
setspent_impl = __nss_lookup_function (ni, "setspent");
|
|
getspnam_r_impl = __nss_lookup_function (ni, "getspnam_r");
|
|
getspent_r_impl = __nss_lookup_function (ni, "getspent_r");
|
|
endspent_impl = __nss_lookup_function (ni, "endspent");
|
|
}
|
|
}
|
|
|
|
static void
|
|
give_spwd_free (struct spwd *pwd)
|
|
{
|
|
free (pwd->sp_namp);
|
|
free (pwd->sp_pwdp);
|
|
|
|
memset (pwd, '\0', sizeof (struct spwd));
|
|
pwd->sp_warn = -1;
|
|
pwd->sp_inact = -1;
|
|
pwd->sp_expire = -1;
|
|
pwd->sp_flag = ~0ul;
|
|
}
|
|
|
|
static int
|
|
spwd_need_buflen (struct spwd *pwd)
|
|
{
|
|
int len = 0;
|
|
|
|
if (pwd->sp_pwdp != NULL)
|
|
len += strlen (pwd->sp_pwdp) + 1;
|
|
|
|
return len;
|
|
}
|
|
|
|
static void
|
|
copy_spwd_changes (struct spwd *dest, struct spwd *src,
|
|
char *buffer, size_t buflen)
|
|
{
|
|
if (src->sp_pwdp != NULL && strlen (src->sp_pwdp))
|
|
{
|
|
if (buffer == NULL)
|
|
dest->sp_pwdp = strdup (src->sp_pwdp);
|
|
else if (dest->sp_pwdp
|
|
&& strlen (dest->sp_pwdp) >= strlen (src->sp_pwdp))
|
|
strcpy (dest->sp_pwdp, src->sp_pwdp);
|
|
else
|
|
{
|
|
dest->sp_pwdp = buffer;
|
|
strcpy (dest->sp_pwdp, src->sp_pwdp);
|
|
buffer += strlen (dest->sp_pwdp) + 1;
|
|
buflen = buflen - (strlen (dest->sp_pwdp) + 1);
|
|
}
|
|
}
|
|
if (src->sp_lstchg != 0)
|
|
dest->sp_lstchg = src->sp_lstchg;
|
|
if (src->sp_min != 0)
|
|
dest->sp_min = src->sp_min;
|
|
if (src->sp_max != 0)
|
|
dest->sp_max = src->sp_max;
|
|
if (src->sp_warn != -1)
|
|
dest->sp_warn = src->sp_warn;
|
|
if (src->sp_inact != -1)
|
|
dest->sp_inact = src->sp_inact;
|
|
if (src->sp_expire != -1)
|
|
dest->sp_expire = src->sp_expire;
|
|
if (src->sp_flag != ~0ul)
|
|
dest->sp_flag = src->sp_flag;
|
|
}
|
|
|
|
static enum nss_status
|
|
internal_setspent (ent_t *ent, int stayopen, int needent)
|
|
{
|
|
enum nss_status status = NSS_STATUS_SUCCESS;
|
|
|
|
ent->first = ent->netgroup = 0;
|
|
ent->files = true;
|
|
|
|
/* If something was left over free it. */
|
|
if (ent->netgroup)
|
|
__internal_endnetgrent (&ent->netgrdata);
|
|
|
|
if (ent->blacklist.data != NULL)
|
|
{
|
|
ent->blacklist.current = 1;
|
|
ent->blacklist.data[0] = '|';
|
|
ent->blacklist.data[1] = '\0';
|
|
}
|
|
else
|
|
ent->blacklist.current = 0;
|
|
|
|
if (ent->stream == NULL)
|
|
{
|
|
ent->stream = __nss_files_fopen ("/etc/shadow");
|
|
|
|
if (ent->stream == NULL)
|
|
status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
|
|
}
|
|
else
|
|
rewind (ent->stream);
|
|
|
|
give_spwd_free (&ent->pwd);
|
|
|
|
if (needent && status == NSS_STATUS_SUCCESS && setspent_impl)
|
|
ent->setent_status = setspent_impl (stayopen);
|
|
|
|
return status;
|
|
}
|
|
|
|
|
|
enum nss_status
|
|
_nss_compat_setspent (int stayopen)
|
|
{
|
|
enum nss_status result;
|
|
|
|
__libc_lock_lock (lock);
|
|
|
|
if (ni == NULL)
|
|
init_nss_interface ();
|
|
|
|
result = internal_setspent (&ext_ent, stayopen, 1);
|
|
|
|
__libc_lock_unlock (lock);
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
static enum nss_status __attribute_warn_unused_result__
|
|
internal_endspent (ent_t *ent)
|
|
{
|
|
if (ent->stream != NULL)
|
|
{
|
|
fclose (ent->stream);
|
|
ent->stream = NULL;
|
|
}
|
|
|
|
if (ent->netgroup)
|
|
__internal_endnetgrent (&ent->netgrdata);
|
|
|
|
ent->first = ent->netgroup = false;
|
|
ent->files = true;
|
|
|
|
if (ent->blacklist.data != NULL)
|
|
{
|
|
ent->blacklist.current = 1;
|
|
ent->blacklist.data[0] = '|';
|
|
ent->blacklist.data[1] = '\0';
|
|
}
|
|
else
|
|
ent->blacklist.current = 0;
|
|
|
|
give_spwd_free (&ent->pwd);
|
|
|
|
return NSS_STATUS_SUCCESS;
|
|
}
|
|
|
|
/* Like internal_endspent, but preserve errno in all cases. */
|
|
static void
|
|
internal_endspent_noerror (ent_t *ent)
|
|
{
|
|
int saved_errno = errno;
|
|
enum nss_status unused __attribute__ ((unused)) = internal_endspent (ent);
|
|
__set_errno (saved_errno);
|
|
}
|
|
|
|
enum nss_status
|
|
_nss_compat_endspent (void)
|
|
{
|
|
enum nss_status result;
|
|
|
|
__libc_lock_lock (lock);
|
|
|
|
if (endspent_impl)
|
|
endspent_impl ();
|
|
|
|
result = internal_endspent (&ext_ent);
|
|
|
|
__libc_lock_unlock (lock);
|
|
|
|
return result;
|
|
}
|
|
|
|
static enum nss_status
|
|
getspent_next_nss_netgr (const char *name, struct spwd *result, ent_t *ent,
|
|
char *group, char *buffer, size_t buflen,
|
|
int *errnop)
|
|
{
|
|
char *curdomain = NULL, *host, *user, *domain, *p2;
|
|
size_t p2len;
|
|
|
|
if (!getspnam_r_impl)
|
|
return NSS_STATUS_UNAVAIL;
|
|
|
|
/* If the setpwent call failed, say so. */
|
|
if (ent->setent_status != NSS_STATUS_SUCCESS)
|
|
return ent->setent_status;
|
|
|
|
if (ent->first)
|
|
{
|
|
memset (&ent->netgrdata, 0, sizeof (struct __netgrent));
|
|
__internal_setnetgrent (group, &ent->netgrdata);
|
|
ent->first = false;
|
|
}
|
|
|
|
while (1)
|
|
{
|
|
enum nss_status status;
|
|
|
|
status = __internal_getnetgrent_r (&host, &user, &domain,
|
|
&ent->netgrdata, buffer, buflen,
|
|
errnop);
|
|
if (status != 1)
|
|
{
|
|
__internal_endnetgrent (&ent->netgrdata);
|
|
ent->netgroup = false;
|
|
give_spwd_free (&ent->pwd);
|
|
return NSS_STATUS_RETURN;
|
|
}
|
|
|
|
if (user == NULL || user[0] == '-')
|
|
continue;
|
|
|
|
if (domain != NULL)
|
|
{
|
|
if (curdomain == NULL
|
|
&& __nss_get_default_domain (&curdomain) != 0)
|
|
{
|
|
__internal_endnetgrent (&ent->netgrdata);
|
|
ent->netgroup = false;
|
|
give_spwd_free (&ent->pwd);
|
|
return NSS_STATUS_UNAVAIL;
|
|
}
|
|
if (strcmp (curdomain, domain) != 0)
|
|
continue;
|
|
}
|
|
|
|
/* If name != NULL, we are called from getpwnam */
|
|
if (name != NULL)
|
|
if (strcmp (user, name) != 0)
|
|
continue;
|
|
|
|
p2len = spwd_need_buflen (&ent->pwd);
|
|
if (p2len > buflen)
|
|
{
|
|
*errnop = ERANGE;
|
|
return NSS_STATUS_TRYAGAIN;
|
|
}
|
|
p2 = buffer + (buflen - p2len);
|
|
buflen -= p2len;
|
|
|
|
if (getspnam_r_impl (user, result, buffer, buflen, errnop)
|
|
!= NSS_STATUS_SUCCESS)
|
|
continue;
|
|
|
|
if (!in_blacklist (result->sp_namp, strlen (result->sp_namp), ent))
|
|
{
|
|
/* Store the User in the blacklist for possible the "+" at the
|
|
end of /etc/passwd */
|
|
blacklist_store_name (result->sp_namp, ent);
|
|
copy_spwd_changes (result, &ent->pwd, p2, p2len);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return NSS_STATUS_SUCCESS;
|
|
}
|
|
|
|
|
|
static enum nss_status
|
|
getspent_next_nss (struct spwd *result, ent_t *ent,
|
|
char *buffer, size_t buflen, int *errnop)
|
|
{
|
|
enum nss_status status;
|
|
char *p2;
|
|
size_t p2len;
|
|
|
|
if (!getspent_r_impl)
|
|
return NSS_STATUS_UNAVAIL;
|
|
|
|
p2len = spwd_need_buflen (&ent->pwd);
|
|
if (p2len > buflen)
|
|
{
|
|
*errnop = ERANGE;
|
|
return NSS_STATUS_TRYAGAIN;
|
|
}
|
|
p2 = buffer + (buflen - p2len);
|
|
buflen -= p2len;
|
|
do
|
|
{
|
|
if ((status = getspent_r_impl (result, buffer, buflen, errnop))
|
|
!= NSS_STATUS_SUCCESS)
|
|
return status;
|
|
}
|
|
while (in_blacklist (result->sp_namp, strlen (result->sp_namp), ent));
|
|
|
|
copy_spwd_changes (result, &ent->pwd, p2, p2len);
|
|
|
|
return NSS_STATUS_SUCCESS;
|
|
}
|
|
|
|
|
|
/* This function handle the +user entrys in /etc/shadow */
|
|
static enum nss_status
|
|
getspnam_plususer (const char *name, struct spwd *result, ent_t *ent,
|
|
char *buffer, size_t buflen, int *errnop)
|
|
{
|
|
if (!getspnam_r_impl)
|
|
return NSS_STATUS_UNAVAIL;
|
|
|
|
struct spwd pwd;
|
|
memset (&pwd, '\0', sizeof (struct spwd));
|
|
pwd.sp_warn = -1;
|
|
pwd.sp_inact = -1;
|
|
pwd.sp_expire = -1;
|
|
pwd.sp_flag = ~0ul;
|
|
|
|
copy_spwd_changes (&pwd, result, NULL, 0);
|
|
|
|
size_t plen = spwd_need_buflen (&pwd);
|
|
if (plen > buflen)
|
|
{
|
|
*errnop = ERANGE;
|
|
return NSS_STATUS_TRYAGAIN;
|
|
}
|
|
char *p = buffer + (buflen - plen);
|
|
buflen -= plen;
|
|
|
|
enum nss_status status = getspnam_r_impl (name, result, buffer, buflen,
|
|
errnop);
|
|
if (status != NSS_STATUS_SUCCESS)
|
|
return status;
|
|
|
|
if (in_blacklist (result->sp_namp, strlen (result->sp_namp), ent))
|
|
return NSS_STATUS_NOTFOUND;
|
|
|
|
copy_spwd_changes (result, &pwd, p, plen);
|
|
give_spwd_free (&pwd);
|
|
/* We found the entry. */
|
|
return NSS_STATUS_SUCCESS;
|
|
}
|
|
|
|
|
|
static enum nss_status
|
|
getspent_next_file (struct spwd *result, ent_t *ent,
|
|
char *buffer, size_t buflen, int *errnop)
|
|
{
|
|
struct parser_data *data = (void *) buffer;
|
|
while (1)
|
|
{
|
|
fpos_t pos;
|
|
int parse_res = 0;
|
|
char *p;
|
|
|
|
do
|
|
{
|
|
/* We need at least 3 characters for one line. */
|
|
if (__glibc_unlikely (buflen < 3))
|
|
{
|
|
erange:
|
|
*errnop = ERANGE;
|
|
return NSS_STATUS_TRYAGAIN;
|
|
}
|
|
|
|
fgetpos (ent->stream, &pos);
|
|
buffer[buflen - 1] = '\xff';
|
|
p = fgets_unlocked (buffer, buflen, ent->stream);
|
|
if (p == NULL && feof_unlocked (ent->stream))
|
|
return NSS_STATUS_NOTFOUND;
|
|
|
|
if (p == NULL || __builtin_expect (buffer[buflen - 1] != '\xff', 0))
|
|
{
|
|
erange_reset:
|
|
fsetpos (ent->stream, &pos);
|
|
goto erange;
|
|
}
|
|
|
|
/* Skip leading blanks. */
|
|
while (isspace (*p))
|
|
++p;
|
|
}
|
|
while (*p == '\0' || *p == '#' /* Ignore empty and comment lines. */
|
|
/* Parse the line. If it is invalid, loop to
|
|
get the next line of the file to parse. */
|
|
|| !(parse_res = _nss_files_parse_spent (p, result, data,
|
|
buflen, errnop)));
|
|
|
|
if (__glibc_unlikely (parse_res == -1))
|
|
/* The parser ran out of space. */
|
|
goto erange_reset;
|
|
|
|
if (result->sp_namp[0] != '+' && result->sp_namp[0] != '-')
|
|
/* This is a real entry. */
|
|
break;
|
|
|
|
/* -@netgroup */
|
|
if (result->sp_namp[0] == '-' && result->sp_namp[1] == '@'
|
|
&& result->sp_namp[2] != '\0')
|
|
{
|
|
/* XXX Do not use fixed length buffers. */
|
|
char buf2[1024];
|
|
char *user, *host, *domain;
|
|
struct __netgrent netgrdata;
|
|
|
|
memset (&netgrdata, 0, sizeof (struct __netgrent));
|
|
__internal_setnetgrent (&result->sp_namp[2], &netgrdata);
|
|
while (__internal_getnetgrent_r (&host, &user, &domain,
|
|
&netgrdata, buf2, sizeof (buf2),
|
|
errnop))
|
|
{
|
|
if (user != NULL && user[0] != '-')
|
|
blacklist_store_name (user, ent);
|
|
}
|
|
__internal_endnetgrent (&netgrdata);
|
|
continue;
|
|
}
|
|
|
|
/* +@netgroup */
|
|
if (result->sp_namp[0] == '+' && result->sp_namp[1] == '@'
|
|
&& result->sp_namp[2] != '\0')
|
|
{
|
|
int status;
|
|
|
|
ent->netgroup = true;
|
|
ent->first = true;
|
|
copy_spwd_changes (&ent->pwd, result, NULL, 0);
|
|
|
|
status = getspent_next_nss_netgr (NULL, result, ent,
|
|
&result->sp_namp[2],
|
|
buffer, buflen, errnop);
|
|
if (status == NSS_STATUS_RETURN)
|
|
continue;
|
|
else
|
|
return status;
|
|
}
|
|
|
|
/* -user */
|
|
if (result->sp_namp[0] == '-' && result->sp_namp[1] != '\0'
|
|
&& result->sp_namp[1] != '@')
|
|
{
|
|
blacklist_store_name (&result->sp_namp[1], ent);
|
|
continue;
|
|
}
|
|
|
|
/* +user */
|
|
if (result->sp_namp[0] == '+' && result->sp_namp[1] != '\0'
|
|
&& result->sp_namp[1] != '@')
|
|
{
|
|
size_t len = strlen (result->sp_namp);
|
|
char buf[len];
|
|
enum nss_status status;
|
|
|
|
/* Store the User in the blacklist for the "+" at the end of
|
|
/etc/passwd */
|
|
memcpy (buf, &result->sp_namp[1], len);
|
|
status = getspnam_plususer (&result->sp_namp[1], result, ent,
|
|
buffer, buflen, errnop);
|
|
blacklist_store_name (buf, ent);
|
|
|
|
if (status == NSS_STATUS_SUCCESS) /* We found the entry. */
|
|
break;
|
|
/* We couldn't parse the entry */
|
|
else if (status == NSS_STATUS_RETURN
|
|
/* entry doesn't exist */
|
|
|| status == NSS_STATUS_NOTFOUND)
|
|
continue;
|
|
else
|
|
{
|
|
if (status == NSS_STATUS_TRYAGAIN)
|
|
{
|
|
fsetpos (ent->stream, &pos);
|
|
*errnop = ERANGE;
|
|
}
|
|
return status;
|
|
}
|
|
}
|
|
|
|
/* +:... */
|
|
if (result->sp_namp[0] == '+' && result->sp_namp[1] == '\0')
|
|
{
|
|
ent->files = false;
|
|
ent->first = true;
|
|
copy_spwd_changes (&ent->pwd, result, NULL, 0);
|
|
|
|
return getspent_next_nss (result, ent, buffer, buflen, errnop);
|
|
}
|
|
}
|
|
|
|
return NSS_STATUS_SUCCESS;
|
|
}
|
|
|
|
|
|
static enum nss_status
|
|
internal_getspent_r (struct spwd *pw, ent_t *ent,
|
|
char *buffer, size_t buflen, int *errnop)
|
|
{
|
|
if (ent->netgroup)
|
|
{
|
|
enum nss_status status;
|
|
|
|
/* We are searching members in a netgroup */
|
|
/* Since this is not the first call, we don't need the group name */
|
|
status = getspent_next_nss_netgr (NULL, pw, ent, NULL, buffer,
|
|
buflen, errnop);
|
|
|
|
if (status == NSS_STATUS_RETURN)
|
|
return getspent_next_file (pw, ent, buffer, buflen, errnop);
|
|
else
|
|
return status;
|
|
}
|
|
else if (ent->files)
|
|
return getspent_next_file (pw, ent, buffer, buflen, errnop);
|
|
else
|
|
return getspent_next_nss (pw, ent, buffer, buflen, errnop);
|
|
}
|
|
|
|
|
|
enum nss_status
|
|
_nss_compat_getspent_r (struct spwd *pwd, char *buffer, size_t buflen,
|
|
int *errnop)
|
|
{
|
|
enum nss_status result = NSS_STATUS_SUCCESS;
|
|
|
|
__libc_lock_lock (lock);
|
|
|
|
/* Be prepared that the setpwent function was not called before. */
|
|
if (ni == NULL)
|
|
init_nss_interface ();
|
|
|
|
if (ext_ent.stream == NULL)
|
|
result = internal_setspent (&ext_ent, 1, 1);
|
|
|
|
if (result == NSS_STATUS_SUCCESS)
|
|
result = internal_getspent_r (pwd, &ext_ent, buffer, buflen, errnop);
|
|
|
|
__libc_lock_unlock (lock);
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
/* Searches in /etc/passwd and the NIS/NIS+ map for a special user */
|
|
static enum nss_status
|
|
internal_getspnam_r (const char *name, struct spwd *result, ent_t *ent,
|
|
char *buffer, size_t buflen, int *errnop)
|
|
{
|
|
struct parser_data *data = (void *) buffer;
|
|
|
|
while (1)
|
|
{
|
|
fpos_t pos;
|
|
char *p;
|
|
int parse_res;
|
|
|
|
do
|
|
{
|
|
/* We need at least 3 characters for one line. */
|
|
if (__glibc_unlikely (buflen < 3))
|
|
{
|
|
erange:
|
|
*errnop = ERANGE;
|
|
return NSS_STATUS_TRYAGAIN;
|
|
}
|
|
|
|
fgetpos (ent->stream, &pos);
|
|
buffer[buflen - 1] = '\xff';
|
|
p = fgets_unlocked (buffer, buflen, ent->stream);
|
|
if (p == NULL && feof_unlocked (ent->stream))
|
|
return NSS_STATUS_NOTFOUND;
|
|
|
|
if (p == NULL || buffer[buflen - 1] != '\xff')
|
|
{
|
|
erange_reset:
|
|
fsetpos (ent->stream, &pos);
|
|
goto erange;
|
|
}
|
|
|
|
/* Terminate the line for any case. */
|
|
buffer[buflen - 1] = '\0';
|
|
|
|
/* Skip leading blanks. */
|
|
while (isspace (*p))
|
|
++p;
|
|
}
|
|
while (*p == '\0' || *p == '#' /* Ignore empty and comment lines. */
|
|
/* Parse the line. If it is invalid, loop to
|
|
get the next line of the file to parse. */
|
|
|| !(parse_res = _nss_files_parse_spent (p, result, data, buflen,
|
|
errnop)));
|
|
|
|
if (__glibc_unlikely (parse_res == -1))
|
|
/* The parser ran out of space. */
|
|
goto erange_reset;
|
|
|
|
/* This is a real entry. */
|
|
if (result->sp_namp[0] != '+' && result->sp_namp[0] != '-')
|
|
{
|
|
if (strcmp (result->sp_namp, name) == 0)
|
|
return NSS_STATUS_SUCCESS;
|
|
else
|
|
continue;
|
|
}
|
|
|
|
/* -@netgroup */
|
|
/* If the loaded NSS module does not support this service, add
|
|
all users from a +@netgroup entry to the blacklist, too. */
|
|
if (result->sp_namp[0] == '-' && result->sp_namp[1] == '@'
|
|
&& result->sp_namp[2] != '\0')
|
|
{
|
|
if (innetgr (&result->sp_namp[2], NULL, name, NULL))
|
|
return NSS_STATUS_NOTFOUND;
|
|
continue;
|
|
}
|
|
|
|
/* +@netgroup */
|
|
if (result->sp_namp[0] == '+' && result->sp_namp[1] == '@'
|
|
&& result->sp_namp[2] != '\0')
|
|
{
|
|
enum nss_status status;
|
|
|
|
if (innetgr (&result->sp_namp[2], NULL, name, NULL))
|
|
{
|
|
status = getspnam_plususer (name, result, ent, buffer,
|
|
buflen, errnop);
|
|
|
|
if (status == NSS_STATUS_RETURN)
|
|
continue;
|
|
|
|
return status;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
/* -user */
|
|
if (result->sp_namp[0] == '-' && result->sp_namp[1] != '\0'
|
|
&& result->sp_namp[1] != '@')
|
|
{
|
|
if (strcmp (&result->sp_namp[1], name) == 0)
|
|
return NSS_STATUS_NOTFOUND;
|
|
else
|
|
continue;
|
|
}
|
|
|
|
/* +user */
|
|
if (result->sp_namp[0] == '+' && result->sp_namp[1] != '\0'
|
|
&& result->sp_namp[1] != '@')
|
|
{
|
|
if (strcmp (name, &result->sp_namp[1]) == 0)
|
|
{
|
|
enum nss_status status;
|
|
|
|
status = getspnam_plususer (name, result, ent,
|
|
buffer, buflen, errnop);
|
|
|
|
if (status == NSS_STATUS_RETURN)
|
|
/* We couldn't parse the entry */
|
|
return NSS_STATUS_NOTFOUND;
|
|
else
|
|
return status;
|
|
}
|
|
}
|
|
|
|
/* +:... */
|
|
if (result->sp_namp[0] == '+' && result->sp_namp[1] == '\0')
|
|
{
|
|
enum nss_status status;
|
|
|
|
status = getspnam_plususer (name, result, ent,
|
|
buffer, buflen, errnop);
|
|
|
|
if (status == NSS_STATUS_SUCCESS)
|
|
/* We found the entry. */
|
|
break;
|
|
else if (status == NSS_STATUS_RETURN)
|
|
/* We couldn't parse the entry */
|
|
return NSS_STATUS_NOTFOUND;
|
|
else
|
|
return status;
|
|
}
|
|
}
|
|
return NSS_STATUS_SUCCESS;
|
|
}
|
|
|
|
|
|
enum nss_status
|
|
_nss_compat_getspnam_r (const char *name, struct spwd *pwd,
|
|
char *buffer, size_t buflen, int *errnop)
|
|
{
|
|
enum nss_status result;
|
|
ent_t ent = { false, true, false, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0},
|
|
{ NULL, NULL, 0, 0, 0, 0, 0, 0, 0}};
|
|
|
|
if (name[0] == '-' || name[0] == '+')
|
|
return NSS_STATUS_NOTFOUND;
|
|
|
|
__libc_lock_lock (lock);
|
|
|
|
if (ni == NULL)
|
|
init_nss_interface ();
|
|
|
|
__libc_lock_unlock (lock);
|
|
|
|
result = internal_setspent (&ent, 0, 0);
|
|
|
|
if (result == NSS_STATUS_SUCCESS)
|
|
result = internal_getspnam_r (name, pwd, &ent, buffer, buflen, errnop);
|
|
|
|
internal_endspent_noerror (&ent);
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
/* Support routines for remembering -@netgroup and -user entries.
|
|
The names are stored in a single string with `|' as separator. */
|
|
static void
|
|
blacklist_store_name (const char *name, ent_t *ent)
|
|
{
|
|
int namelen = strlen (name);
|
|
char *tmp;
|
|
|
|
/* first call, setup cache */
|
|
if (ent->blacklist.size == 0)
|
|
{
|
|
ent->blacklist.size = MAX (BLACKLIST_INITIAL_SIZE, 2 * namelen);
|
|
ent->blacklist.data = malloc (ent->blacklist.size);
|
|
if (ent->blacklist.data == NULL)
|
|
return;
|
|
ent->blacklist.data[0] = '|';
|
|
ent->blacklist.data[1] = '\0';
|
|
ent->blacklist.current = 1;
|
|
}
|
|
else
|
|
{
|
|
if (in_blacklist (name, namelen, ent))
|
|
return; /* no duplicates */
|
|
|
|
if (ent->blacklist.current + namelen + 1 >= ent->blacklist.size)
|
|
{
|
|
ent->blacklist.size += MAX (BLACKLIST_INCREMENT, 2 * namelen);
|
|
tmp = realloc (ent->blacklist.data, ent->blacklist.size);
|
|
if (tmp == NULL)
|
|
{
|
|
free (ent->blacklist.data);
|
|
ent->blacklist.size = 0;
|
|
return;
|
|
}
|
|
ent->blacklist.data = tmp;
|
|
}
|
|
}
|
|
|
|
tmp = stpcpy (ent->blacklist.data + ent->blacklist.current, name);
|
|
*tmp++ = '|';
|
|
*tmp = '\0';
|
|
ent->blacklist.current += namelen + 1;
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
/* Returns whether ent->blacklist contains name. */
|
|
static bool
|
|
in_blacklist (const char *name, int namelen, ent_t *ent)
|
|
{
|
|
char buf[namelen + 3];
|
|
char *cp;
|
|
|
|
if (ent->blacklist.data == NULL)
|
|
return false;
|
|
|
|
buf[0] = '|';
|
|
cp = stpcpy (&buf[1], name);
|
|
*cp++ = '|';
|
|
*cp = '\0';
|
|
return strstr (ent->blacklist.data, buf) != NULL;
|
|
}
|