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112 lines
3.0 KiB
C
112 lines
3.0 KiB
C
/* Public key file parser in nss_files module.
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Copyright (C) 1996-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <netdb.h>
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#include <rpc/key_prot.h>
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#include <rpc/des_crypt.h>
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#include "nsswitch.h"
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#define DATAFILE "/etc/publickey"
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static enum nss_status
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search (const char *netname, char *result, int *errnop, int secret)
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{
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FILE *stream = fopen (DATAFILE, "rce");
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if (stream == NULL)
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return errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
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for (;;)
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{
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char buffer[HEXKEYBYTES * 2 + KEYCHECKSUMSIZE + MAXNETNAMELEN + 17];
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char *p;
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char *save_ptr;
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buffer[sizeof (buffer) - 1] = '\xff';
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p = fgets_unlocked (buffer, sizeof (buffer), stream);
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if (p == NULL)
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{
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/* End of file or read error. */
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*errnop = errno;
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fclose (stream);
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return NSS_STATUS_NOTFOUND;
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}
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else if (buffer[sizeof (buffer) - 1] != '\xff')
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{
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/* Invalid line in file? Skip remainder of line. */
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if (buffer[sizeof (buffer) - 2] != '\0')
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while (getc_unlocked (stream) != '\n')
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continue;
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continue;
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}
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/* Parse line. */
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p = __strtok_r (buffer, "# \t:\n", &save_ptr);
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if (p == NULL) /* Skip empty and comment lines. */
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continue;
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if (strcmp (p, netname) != 0)
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continue;
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/* A hit! Find the field we want and return. */
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p = __strtok_r (NULL, ":\n", &save_ptr);
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if (p == NULL) /* malformed line? */
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continue;
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if (secret)
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p = __strtok_r (NULL, ":\n", &save_ptr);
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if (p == NULL) /* malformed line? */
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continue;
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fclose (stream);
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strcpy (result, p);
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return NSS_STATUS_SUCCESS;
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}
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}
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enum nss_status
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_nss_files_getpublickey (const char *netname, char *pkey, int *errnop)
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{
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return search (netname, pkey, errnop, 0);
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}
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enum nss_status
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_nss_files_getsecretkey (const char *netname, char *skey, char *passwd,
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int *errnop)
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{
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enum nss_status status;
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char buf[HEXKEYBYTES + KEYCHECKSUMSIZE + 16];
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skey[0] = 0;
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status = search (netname, buf, errnop, 1);
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if (status != NSS_STATUS_SUCCESS)
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return status;
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if (!xdecrypt (buf, passwd))
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return NSS_STATUS_SUCCESS;
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if (memcmp (buf, &(buf[HEXKEYBYTES]), KEYCHECKSUMSIZE) != 0)
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return NSS_STATUS_SUCCESS;
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buf[HEXKEYBYTES] = 0;
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strcpy (skey, buf);
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return NSS_STATUS_SUCCESS;
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}
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