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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/kadm5/srv/pwqual_hesiod.c */
/*
* Copyright (C) 2010 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
/*
* Password quality module to check passwords against GECOS fields of Hesiod
* passwd information, if the tree is compiled with Hesiod support.
*/
#include "k5-platform.h"
#include <krb5/pwqual_plugin.h>
#include "server_internal.h"
#include <ctype.h>
#ifdef HESIOD
#include <pwd.h>
static char *
reverse(char *str, char *newstr, size_t newstr_size)
{
char *p, *q;
size_t i;
i = strlen(str);
if (i >= newstr_size)
i = newstr_size - 1;
p = str + i - 1;
q = newstr;
q[i] = '\0';
for (; i > 0; i--)
*q++ = *p--;
return newstr;
}
static int
str_check_gecos(char *gecos, const char *pwstr)
{
char *cp, *ncp, *tcp, revbuf[80];
for (cp = gecos; *cp; ) {
/* Skip past punctuation */
for (; *cp; cp++)
if (isalnum(*cp))
break;
/* Skip to the end of the word */
for (ncp = cp; *ncp; ncp++) {
if (!isalnum(*ncp) && *ncp != '\'')
break;
}
/* Delimit end of word */
if (*ncp)
*ncp++ = '\0';
/* Check word to see if it's the password */
if (*cp) {
if (!strcasecmp(pwstr, cp))
return 1;
tcp = reverse(cp, revbuf, sizeof(revbuf));
if (!strcasecmp(pwstr, tcp))
return 1;
cp = ncp;
} else
break;
}
return 0;
}
#endif /* HESIOD */
static krb5_error_code
hesiod_check(krb5_context context, krb5_pwqual_moddata data,
const char *password, const char *policy_name,
krb5_principal princ, const char **languages)
{
#ifdef HESIOD
extern struct passwd *hes_getpwnam();
struct passwd *ent;
int i, n;
const char *cp;
/* Don't check for principals with no password policy. */
if (policy_name == NULL)
return 0;
n = krb5_princ_size(handle->context, princ);
for (i = 0; i < n; i++) {
ent = hes_getpwnam(cp);
if (ent && ent->pw_gecos && str_check_gecos(ent->pw_gecos, password)) {
krb5_set_error_message(context, KADM5_PASS_Q_DICT,
_("Password may not match user "
"information."));
return KADM5_PASS_Q_DICT;
}
}
#endif /* HESIOD */
return 0;
}
krb5_error_code
pwqual_hesiod_initvt(krb5_context context, int maj_ver, int min_ver,
krb5_plugin_vtable vtable)
{
krb5_pwqual_vtable vt;
if (maj_ver != 1)
return KRB5_PLUGIN_VER_NOTSUPP;
vt = (krb5_pwqual_vtable)vtable;
vt->name = "hesiod";
vt->check = hesiod_check;
return 0;
}
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