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/* Copyright (C) 1996-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@suse.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
<https://www.gnu.org/licenses/>. */
#include <nss.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <syslog.h>
#include <rpc/rpc.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>
#include <rpc/key_prot.h>
#include <rpc/des_crypt.h>
#include "nss-nis.h"
/* If we haven't found the entry, we give a SUCCESS and an empty key back.
Solaris docu says: sizeof (pkey) == HEXKEYBYTES + 1.
*/
enum nss_status
_nss_nis_getpublickey (const char *netname, char *pkey, int *errnop)
{
pkey[0] = 0;
if (netname == NULL)
{
*errnop = EINVAL;
return NSS_STATUS_UNAVAIL;
}
char *domain = strchr (netname, '@');
if (domain == NULL)
{
*errnop = EINVAL;
return NSS_STATUS_UNAVAIL;
}
++domain;
char *result;
int len;
int yperr = yp_match (domain, "publickey.byname", netname, strlen (netname),
&result, &len);
if (__glibc_unlikely (yperr != YPERR_SUCCESS))
{
enum nss_status retval = yperr2nss (yperr);
if (retval == NSS_STATUS_TRYAGAIN)
*errnop = errno;
return retval;
}
if (result != NULL)
{
char *p = strchr (result, ':');
if (p != NULL)
*p = 0;
strncpy (pkey, result, HEXKEYBYTES + 1);
pkey[HEXKEYBYTES] = '\0';
free (result);
}
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nis_getsecretkey (const char *netname, char *skey, char *passwd,
int *errnop)
{
skey[0] = 0;
if (netname == NULL || passwd == NULL)
{
*errnop = EINVAL;
return NSS_STATUS_UNAVAIL;
}
char *domain = strchr (netname, '@');
if (domain == NULL)
{
*errnop = EINVAL;
return NSS_STATUS_UNAVAIL;
}
++domain;
char *result;
int len;
int yperr = yp_match (domain, "publickey.byname", netname, strlen (netname),
&result, &len);
if (__glibc_unlikely (yperr != YPERR_SUCCESS))
{
enum nss_status retval = yperr2nss (yperr);
if (retval == NSS_STATUS_TRYAGAIN)
*errnop = errno;
return retval;
}
if (result != NULL)
{
char *p = strchr (result, ':');
if (p != NULL)
{
char buf[2 * (HEXKEYBYTES + 1)];
++p;
strncpy (buf, p, 2 * (HEXKEYBYTES + 1));
buf[2 * HEXKEYBYTES + 1] = '\0';
if (xdecrypt (buf, passwd)
&& memcmp (buf, &(buf[HEXKEYBYTES]), KEYCHECKSUMSIZE) == 0)
{
buf[HEXKEYBYTES] = '\0';
strcpy (skey, buf);
}
}
free (result);
}
return NSS_STATUS_SUCCESS;
}
/* Parse uid and group information from the passed string.
The format of the string passed is uid:gid,grp,grp, ... */
static enum nss_status
parse_netid_str (const char *s, uid_t *uidp, gid_t *gidp, int *gidlenp,
gid_t *gidlist)
{
char *p, *ep;
int gidlen;
if (!s || !isdigit (*s))
{
syslog (LOG_ERR, "netname2user: expecting uid '%s'", s);
return NSS_STATUS_NOTFOUND; /* XXX need a better error */
}
/* Fetch the uid */
*uidp = strtoul (s, NULL, 10);
if (*uidp == 0)
{
syslog (LOG_ERR, "netname2user: should not have uid 0");
return NSS_STATUS_NOTFOUND;
}
/* Now get the group list */
p = strchr (s, ':');
if (!p)
{
syslog (LOG_ERR, "netname2user: missing group id list in '%s'", s);
return NSS_STATUS_NOTFOUND;
}
++p; /* skip ':' */
if (!p || (!isdigit (*p)))
{
syslog (LOG_ERR, "netname2user: missing group id list in '%s'.", p);
return NSS_STATUS_NOTFOUND;
}
*gidp = strtoul (p, &ep, 10);
gidlen = 0;
/* After strtoul() ep should point to the first invalid character.
This is the marker "," we search for the next value. */
while (ep != NULL && *ep == ',')
{
ep++;
p = ep;
gidlist[gidlen++] = strtoul (p, &ep, 10);
}
*gidlenp = gidlen;
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nis_netname2user (char netname[MAXNETNAMELEN + 1], uid_t *uidp,
gid_t *gidp, int *gidlenp, gid_t *gidlist, int *errnop)
{
char *domain = strchr (netname, '@');
if (domain == NULL)
{
*errnop = EINVAL;
return NSS_STATUS_UNAVAIL;
}
/* Point past the '@' character */
++domain;
char *lookup = NULL;
int len;
int yperr = yp_match (domain, "netid.byname", netname, strlen (netname),
&lookup, &len);
switch (yperr)
{
case YPERR_SUCCESS:
break; /* the successful case */
case YPERR_DOMAIN:
case YPERR_KEY:
return NSS_STATUS_NOTFOUND;
case YPERR_MAP:
default:
return NSS_STATUS_UNAVAIL;
}
if (lookup == NULL)
return NSS_STATUS_NOTFOUND;
lookup[len] = '\0';
enum nss_status err = parse_netid_str (lookup, uidp, gidp, gidlenp, gidlist);
free (lookup);
return err;
}
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