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/* $KTH: new_pwd.c,v 1.11 1997/05/02 14:28:54 assar Exp $ */
/*
* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Kungliga Tekniska
* Högskolan and its contributors.
*
* 4. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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 <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <netinet/in.h>
#include <des.h>
#include <kerberosIV/krb.h>
#include <kerberosIV/kadm.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef NOENCRYPTION
#define read_long_pw_string placebo_read_pw_string
#else
#define read_long_pw_string des_read_pw_string
#endif
static char *
check_pw (char *pword)
{
if (strlen(pword) == 0)
return "Null passwords are not allowed - Please enter a longer password.";
if (strlen(pword) < MIN_KPW_LEN)
return "Password is to short - Please enter a longer password.";
/* Don't allow all lower case passwords regardless of length */
{
char *t;
for (t = pword; *t && islower(*t); t++)
;
if (*t == 0)
return "Please don't use an all-lower case password.\n"
"\tUnusual capitalization, delimiter characters or "
"digits are suggested.";
}
return NULL;
}
int
get_pw_new_pwd(char *pword, int pwlen, krb_principal *pr, int print_realm)
{
char ppromp[40+ANAME_SZ+INST_SZ+REALM_SZ]; /* for the password prompt */
char npromp[40+ANAME_SZ+INST_SZ+REALM_SZ]; /* for the password prompt */
char p[MAX_K_NAME_SZ];
char local_realm[REALM_SZ];
int status;
char *expl;
/*
* We don't care about failure; this is to determine whether or
* not to print the realm in the prompt for a new password.
*/
krb_get_lrealm(local_realm, 1);
if (strcmp(local_realm, pr->realm))
print_realm++;
{
char *q;
krb_unparse_name_r(pr, p);
if(print_realm == 0 && (q = strrchr(p, '@')))
*q = 0;
}
snprintf(ppromp, sizeof(ppromp), "Old password for %s:", p);
if (read_long_pw_string(pword, pwlen-1, ppromp, 0)) {
fprintf(stderr, "Error reading old password.\n");
return -1;
}
status = krb_get_pw_in_tkt(pr->name, pr->instance, pr->realm,
PWSERV_NAME, KADM_SINST, 1, pword);
if (status != KSUCCESS) {
if (status == INTK_BADPW) {
printf("Incorrect old password.\n");
return -1;
}
else {
fprintf(stderr, "Kerberos error: %s\n", krb_get_err_text(status));
return -1;
}
}
memset(pword, 0, pwlen);
do {
char verify[MAX_KPW_LEN];
snprintf(npromp, sizeof(npromp), "New Password for %s:",p);
if (read_long_pw_string(pword, pwlen-1, npromp, 0)) {
fprintf(stderr,
"Error reading new password, password unchanged.\n");
return -1;
}
expl = check_pw (pword);
if (expl) {
printf("\n\t%s\n\n", expl);
continue;
}
/* Now we got an ok password, verify it. */
snprintf(npromp, sizeof(npromp), "Verifying New Password for %s:", p);
if (read_long_pw_string(verify, MAX_KPW_LEN-1, npromp, 0)) {
fprintf(stderr,
"Error reading new password, password unchanged.\n");
return -1;
}
if (strcmp(pword, verify) != 0) {
printf("Verify failure - try again\n");
expl = ""; /* continue */
}
} while (expl);
return 0;
}
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