usr/src/local/kerberosIV/register/register.c

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)register.c  1.6 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netdb.h>
#include <netinet/in.h>
#include <krb.h>
#include <sys/param.h>
#include <sys/file.h>
#include <sys/signal.h>
#include "pathnames.h"
#include "register_proto.h"

#define SERVICE "krbupdate"
#define PROTO   "tcp"

char    realm[REALM_SZ];
char    krbhst[MAX_HSTNM];

static  char    pname[ANAME_SZ];
static  char    iname[INST_SZ];
static  char    password[255];

extern char     *sys_errlist;
int     die();

main(argc, argv)
int     argc;
char    **argv;
{
        struct servent  *se;
        struct hostent  *host;
        struct sockaddr_in      sin, local;
        int             rval;
        int             sock, llen;
        u_char          code;
        static struct rlimit rl = { 0, 0 };

        signal(SIGPIPE, die);

        if (setrlimit(RLIMIT_CORE, &rl) < 0) {
                perror("rlimit");
                exit(1);
        }

        if ((se = getservbyname(SERVICE, PROTO)) == NULL) {
                fprintf(stderr, "couldn't find entry for service %s\n",
                        SERVICE);
                exit(1);
        }
        if ((rval = krb_get_lrealm(realm,1)) != KSUCCESS) {
                fprintf(stderr, "couldn't get local Kerberos realm: %s\n",
                        krb_err_txt[rval]);
                exit(1);
        }

        if ((rval = krb_get_krbhst(krbhst, realm, 1)) != KSUCCESS) {
                fprintf(stderr, "couldn't get Kerberos host: %s\n",
                        krb_err_txt[rval]);
                exit(1);
        }

        if ((host = gethostbyname(krbhst)) == NULL) {
                fprintf(stderr, "couldn't get host entry for host %s\n",
                        krbhst);
                exit(1);
        }

        sin.sin_family = host->h_addrtype;
        bcopy(host->h_addr, (char *) &sin.sin_addr, host->h_length);
        sin.sin_port = se->s_port;

        if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
                perror("socket");
                exit(1);
        }

        if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
                perror("connect");
                close(sock);
                exit(1);
        }

        llen = sizeof(local);
        if (getsockname(sock, (struct sockaddr *) &local, &llen) < 0) {
                perror("getsockname");
                close(sock);
                exit(1);
        }

        setup_key(local);

        type_info();

        if (!get_user_info()) {
                code = ABORT;
                (void)des_write(sock, &code, 1);
                cleanup();
                exit(1);
        }

        code = APPEND_DB;
        if (des_write(sock, &code, 1) != 1) {
                perror("write 1");
                cleanup();
                exit(1);
        }

        if (des_write(sock, pname, ANAME_SZ) != ANAME_SZ) {
                perror("write principal name");
                cleanup();
                exit(1);
        }

        if (des_write(sock, iname, INST_SZ) != INST_SZ) {
                perror("write instance name");
                cleanup();
                exit(1);
        }

        if (des_write(sock, password, 255) != 255) {
                perror("write password");
                cleanup();
                exit(1);
        }

        /* get return message */

        {
                int     cc;
                char    msgbuf[BUFSIZ];

                cc = read(sock, msgbuf, BUFSIZ);
                if (cc <= 0) {
                        fprintf(stderr, "protocol error during key verification\n");
                        cleanup();
                        exit(1);
                }
                if (strncmp(msgbuf, GOTKEY_MSG, 6) != 0) {
                        fprintf(stderr, "%s: %s", krbhst, msgbuf);
                        cleanup();
                        exit(1);
                }

                cc = des_read(sock, msgbuf, BUFSIZ);
                if (cc <= 0) {
                        fprintf(stderr, "protocol error during read\n");
                        cleanup();
                        exit(1);
                } else {
                        printf("%s: %s", krbhst, msgbuf);
                }
        }

        cleanup();
        close(sock);
}

cleanup()
{
        bzero(password, 255);
}

#include <pwd.h>

extern  char    *crypt();
extern  char    *getpass();

int
get_user_info()
{
        int     uid = getuid();
        int     valid = 0, i;
        struct  passwd  *pw;
        char    *pas, *namep;

        if ((pw = getpwuid(uid)) == NULL) {
                fprintf(stderr, "Who are you?\n");
                return(0);
        }
        seteuid(uid);
        strcpy(pname, pw->pw_name);     /* principal name */
        for(i = 1; i < 3; i++) {
                pas = getpass("login password:");
                namep = crypt(pas, pw->pw_passwd);
                if (strcmp(namep, pw->pw_passwd)) {
                        fprintf(stderr, "Password incorrect\n");
                        continue;
                } else {
                        valid = 1;
                        break;
                }
        }
        if (!valid)
                return(0);
        pas = getpass("Kerberos password (may be the same):");
        while(*pas == NULL) {
                printf("<NULL> password not allowed\n");
                pas = getpass("Kerberos password (may be the same):");
        }
        strcpy(password, pas);          /* password */
        pas = getpass("Retype Kerberos password:");
        if (strcmp(password, pas)) {
                fprintf(stderr, "Password mismatch -- aborted\n");
                return(0);
        }

        iname[0] = NULL;        /* null instance name */
        return(1);
}

setup_key(local)
        struct  sockaddr_in     local;
{
        static  struct  keyfile_data    kdata;
        static  Key_schedule            schedule;
        int     fd;
        char    namebuf[MAXPATHLEN];
        extern int errno;

        (void) sprintf(namebuf, "%s%s"
                CLIENT_KEYFILE,
                inet_ntoa(local.sin_addr));

        fd = open(namebuf, O_RDONLY);
        if (fd < 0) {
                fprintf(stderr, "couldn't open key file for local host %s\n",
                        inet_ntoa(local.sin_addr));
                perror("open");
                exit(1);
        }

        if (read(fd, (char *)&kdata, sizeof(kdata)) != sizeof(kdata)) {
                fprintf(stderr,"size error reading key file for local host %s\n",
                        inet_ntoa(local.sin_addr));
                exit(1);
        }
        key_sched(kdata.kf_key, schedule);
        des_set_key(kdata.kf_key, schedule);
}

type_info()
{
        printf("Kerberos user registration (realm %s)\n\n", realm);
        printf("Please enter your login password followed by your new Kerberos password.\n");
        printf("The Kerberos password you enter now will be used in the future\n");
        printf("as your Kerberos password for all machines in the %s realm.\n", realm);
        printf("You will only be allowed to perform this operation once, although you may run\n");
        printf("the %s program from now on to change your Kerberos password.\n\n", _PATH_KPASSWD);
}

die()
{
        fprintf(stderr, "\nServer no longer listening\n");
        fflush(stderr);
        cleanup();
        exit(1);
}