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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* plugins/kdb/ldap/libkdb_ldap/ldap_service_stash.c */
/*
* Copyright (c) 2004-2005, Novell, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * The copyright holder's name is not used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <ctype.h>
#include "ldap_main.h"
#include "kdb_ldap.h"
#include "ldap_service_stash.h"
/* Decode a password of the form {HEX}<hexstring>. */
static krb5_error_code
dec_password(krb5_context context, const char *str,
unsigned char **password_out)
{
size_t len;
const unsigned char *p;
unsigned char *password, *q;
unsigned int k;
*password_out = NULL;
if (strncmp(str, "{HEX}", 5) != 0) {
k5_setmsg(context, EINVAL, _("Not a hexadecimal password"));
return EINVAL;
}
str += 5;
len = strlen(str);
if (len % 2 != 0) {
k5_setmsg(context, EINVAL, _("Password corrupt"));
return EINVAL;
}
q = password = malloc(len / 2 + 1);
if (password == NULL)
return ENOMEM;
for (p = (unsigned char *)str; *p != '\0'; p += 2) {
if (!isxdigit(*p) || !isxdigit(p[1])) {
free(password);
k5_setmsg(context, EINVAL, _("Password corrupt"));
return EINVAL;
}
sscanf((char *)p, "%2x", &k);
*q++ = k;
}
*q = '\0';
*password_out = password;
return 0;
}
krb5_error_code
krb5_ldap_readpassword(krb5_context context, krb5_ldap_context *ldap_context,
unsigned char **password)
{
int entryfound=0;
krb5_error_code st=0;
char line[RECORDLEN]="0", *start=NULL, *file=NULL;
FILE *fptr=NULL;
*password = NULL;
if (ldap_context->service_password_file)
file = ldap_context->service_password_file;
fptr = fopen(file, "r");
if (fptr == NULL) {
st = errno;
k5_setmsg(context, st, _("Cannot open LDAP password file '%s': %s"),
file, error_message(st));
goto rp_exit;
}
set_cloexec_file(fptr);
/* get the record from the file */
while (fgets(line, RECORDLEN, fptr)!= NULL) {
char tmp[RECORDLEN];
tmp[0] = '\0';
/* Handle leading white-spaces */
for (start = line; isspace(*start); ++start);
/* Handle comment lines */
if (*start == '!' || *start == '#')
continue;
sscanf(line, "%*[ \t]%[^#]", tmp);
if (tmp[0] == '\0')
sscanf(line, "%[^#]", tmp);
if (strcasecmp(tmp, ldap_context->bind_dn) == 0) {
entryfound = 1; /* service_dn record found !!! */
break;
}
}
fclose (fptr);
if (entryfound == 0) {
st = KRB5_KDB_SERVER_INTERNAL_ERR;
k5_setmsg(context, st,
_("Bind DN entry '%s' missing in LDAP password file '%s'"),
ldap_context->bind_dn, file);
goto rp_exit;
}
/* replace the \n with \0 */
start = strchr(line, '\n');
if (start)
*start = '\0';
start = strchr(line, '#');
if (start == NULL) {
/* password field missing */
st = KRB5_KDB_SERVER_INTERNAL_ERR;
k5_setmsg(context, st, _("Stash file entry corrupt"));
goto rp_exit;
}
++ start;
/* Extract the plain password information. */
st = dec_password(context, start, password);
rp_exit:
if (st) {
if (*password)
free (*password);
*password = NULL;
}
return st;
}
/* Encodes a sequence of bytes in hexadecimal */
int
tohex(krb5_data in, krb5_data *ret)
{
unsigned int i=0;
int err = 0;
ret->length = 0;
ret->data = NULL;
ret->data = malloc((unsigned int)in.length * 2 + 1 /*Null termination */);
if (ret->data == NULL) {
err = ENOMEM;
goto cleanup;
}
ret->length = in.length * 2;
ret->data[ret->length] = 0;
for (i = 0; i < in.length; i++)
snprintf(ret->data + 2 * i, 3, "%02x", in.data[i] & 0xff);
cleanup:
if (ret->length == 0) {
free(ret->data);
ret->data = NULL;
}
return err;
}
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