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/*
* Copyright 1988 by the Massachusetts Institute of Technology.
*
* For copying and distribution information, please see the file
* Copyright.MIT.
*
* change your password with kerberos
*/
#ifndef lint
#if 0
static char rcsid_kpasswd_c[] =
"BonesHeader: /afs/athena.mit.edu/astaff/project/kerberos/src/kadmin/RCS/kpasswd.c,v 4.3 89/09/26 09:33:02 jtkohl Exp ";
#endif
static const char rcsid[] =
"$Id: kpasswd.c,v 1.4 1995/09/07 21:38:55 markm Exp $";
#endif lint
/*
* kpasswd
* change your password with kerberos
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/param.h>
#include <pwd.h>
#include "kadm.h"
#include "extern.h"
extern void krb_set_tkt_string();
static void go_home(char *, int);
int krb_passwd(char *uname, char *iflag, char *rflag, char *uflag)
{
char name[ANAME_SZ]; /* name of user */
char inst[INST_SZ]; /* instance of user */
char realm[REALM_SZ]; /* realm of user */
char default_name[ANAME_SZ];
char default_inst[INST_SZ];
char default_realm[REALM_SZ];
int realm_given = 0; /* True if realm was give on cmdline */
int use_default = 1; /* True if we should use default name */
struct passwd *pw;
int status; /* return code */
des_cblock new_key;
int c;
extern char *optarg;
extern int optind;
char tktstring[MAXPATHLEN];
void get_pw_new_key();
#ifdef NOENCRYPTION
#define read_long_pw_string placebo_read_pw_string
#else
#define read_long_pw_string des_read_pw_string
#endif
int read_long_pw_string();
bzero(name, sizeof(name));
bzero(inst, sizeof(inst));
bzero(realm, sizeof(realm));
if (krb_get_tf_fullname(TKT_FILE, default_name, default_inst,
default_realm) != KSUCCESS) {
pw = getpwuid((int) getuid());
if (pw) {
strcpy(default_name, pw->pw_name);
} else {
/* seems like a null name is kinda silly */
strcpy(default_name, "");
}
strcpy(default_inst, "");
if (krb_get_lrealm(default_realm, 1) != KSUCCESS)
strcpy(default_realm, KRB_REALM);
}
if(uflag) {
if (status = kname_parse(name, inst, realm, uflag)) {
errx(2, "Kerberos error: %s", krb_err_txt[status]);
}
if (realm[0])
realm_given++;
else
if (krb_get_lrealm(realm, 1) != KSUCCESS)
strcpy(realm, KRB_REALM);
}
if(uname) {
if (k_isname(uname)) {
strncpy(name, uname, sizeof(name) - 1);
} else {
errx(1, "bad name: %s", uname);
}
}
if(iflag) {
if (k_isinst(iflag)) {
strncpy(inst, iflag, sizeof(inst) - 1);
} else {
errx(1, "bad instance: %s", iflag);
}
}
if(rflag) {
if (k_isrealm(rflag)) {
strncpy(realm, rflag, sizeof(realm) - 1);
realm_given++;
} else {
errx(1, "bad realm: %s", rflag);
}
}
if(uname || iflag || rflag || uflag) use_default = 0;
if (use_default) {
strcpy(name, default_name);
strcpy(inst, default_inst);
strcpy(realm, default_realm);
} else {
if (!name[0])
strcpy(name, default_name);
if (!realm[0])
strcpy(realm, default_realm);
}
(void) sprintf(tktstring, "/tmp/tkt_cpw_%d",getpid());
krb_set_tkt_string(tktstring);
get_pw_new_key(new_key, name, inst, realm, realm_given);
if ((status = kadm_init_link("changepw", KRB_MASTER, realm))
!= KADM_SUCCESS)
com_err("kpasswd", status, "while initializing");
else if ((status = kadm_change_pw(new_key)) != KADM_SUCCESS)
com_err("kpasswd", status, " attempting to change password.");
if (status != KADM_SUCCESS)
fprintf(stderr,"Password NOT changed.\n");
else
printf("Password changed.\n");
(void) dest_tkt();
if (status)
exit(2);
else
exit(0);
}
void get_pw_new_key(new_key, name, inst, realm, print_realm)
des_cblock new_key;
char *name;
char *inst;
char *realm;
int print_realm; /* True if realm was give on cmdline */
{
char ppromp[40+ANAME_SZ+INST_SZ+REALM_SZ]; /* for the password prompt */
char pword[MAX_KPW_LEN]; /* storage for the password */
char npromp[40+ANAME_SZ+INST_SZ+REALM_SZ]; /* for the password prompt */
char local_realm[REALM_SZ];
int status;
/*
* We don't care about failure; this is to determine whether or
* not to print the realm in the prompt for a new password.
*/
(void) krb_get_lrealm(local_realm, 1);
if (strcmp(local_realm, realm))
print_realm++;
(void) sprintf(ppromp,"Old password for %s%s%s%s%s:",
name, *inst ? "." : "", inst,
print_realm ? "@" : "", print_realm ? realm : "");
if (read_long_pw_string(pword, sizeof(pword)-1, ppromp, 0)) {
fprintf(stderr, "Error reading old password.\n");
exit(1);
}
if ((status = krb_get_pw_in_tkt(name, inst, realm, PWSERV_NAME,
KADM_SINST, 1, pword)) != KSUCCESS) {
if (status == INTK_BADPW) {
printf("Incorrect old password.\n");
exit(0);
}
else {
fprintf(stderr, "Kerberos error: %s\n", krb_err_txt[status]);
exit(1);
}
}
bzero(pword, sizeof(pword));
do {
(void) sprintf(npromp,"New Password for %s%s%s%s%s:",
name, *inst ? "." : "", inst,
print_realm ? "@" : "", print_realm ? realm : "");
if (read_long_pw_string(pword, sizeof(pword)-1, npromp, 1))
go_home("Error reading new password, password unchanged.\n",0);
if (strlen(pword) == 0)
printf("Null passwords are not allowed; try again.\n");
} while (strlen(pword) == 0);
#ifdef NOENCRYPTION
bzero((char *) new_key, sizeof(des_cblock));
new_key[0] = (unsigned char) 1;
#else
(void) des_string_to_key(pword, (des_cblock *)new_key);
#endif
bzero(pword, sizeof(pword));
}
static void
go_home(str,x)
char *str;
int x;
{
fprintf(stderr, str, x);
(void) dest_tkt();
exit(1);
}
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