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/*
* appl/sample/sclient/sclient.c
*
* Copyright 1990,1991 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. 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.
*
*
* Sample Kerberos v5 client.
*
* Usage: sample_client hostname
*/
#include "krb5.h"
#include "com_err.h"
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <signal.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#else
extern char *malloc();
#endif
#include "../sample.h"
void
main(argc, argv)
int argc;
char *argv[];
{
struct servent *sp;
struct hostent *hp;
struct sockaddr_in sin, lsin;
int sock, namelen;
krb5_context context;
krb5_data recv_data;
krb5_data cksum_data;
krb5_error_code retval;
krb5_ccache ccdef;
krb5_principal client, server;
krb5_error *err_ret;
krb5_ap_rep_enc_part *rep_ret;
krb5_auth_context auth_context = 0;
short xmitlen;
char *service = SAMPLE_SERVICE;
if (argc != 2 && argc != 3 && argc != 4) {
fprintf(stderr, "usage: %s <hostname> [port] [service]\n",argv[0]);
exit(1);
}
retval = krb5_init_context(&context);
if (retval) {
com_err(argv[0], retval, "while initializing krb5");
exit(1);
}
(void) signal(SIGPIPE, SIG_IGN);
if (!valid_cksumtype(CKSUMTYPE_CRC32)) {
com_err(argv[0], KRB5_PROG_SUMTYPE_NOSUPP, "while using CRC-32");
exit(1);
}
/* clear out the structure first */
(void) memset((char *)&sin, 0, sizeof(sin));
if (argc > 2) {
sin.sin_family = AF_INET;
sin.sin_port = htons(atoi(argv[2]));
} else {
/* find the port number for knetd */
sp = getservbyname(SAMPLE_PORT, "tcp");
if (!sp) {
fprintf(stderr,
"unknown service %s/tcp; check /etc/services\n",
SAMPLE_PORT);
exit(1);
}
/* copy the port number */
sin.sin_port = sp->s_port;
sin.sin_family = AF_INET;
}
if (argc > 3) {
service = argv[3];
}
/* look up the server host */
hp = gethostbyname(argv[1]);
if (!hp) {
fprintf(stderr, "unknown host %s\n",argv[1]);
exit(1);
}
if (retval = krb5_sname_to_principal(context, argv[1], service,
KRB5_NT_SRV_HST, &server)) {
com_err(argv[0], retval, "while creating server name for %s/%s",
argv[1], service);
exit(1);
}
/* set up the address of the foreign socket for connect() */
sin.sin_family = hp->h_addrtype;
(void) memcpy((char *)&sin.sin_addr,
(char *)hp->h_addr,
sizeof(hp->h_addr));
/* open a TCP socket */
sock = socket(PF_INET, SOCK_STREAM, 0);
if (sock < 0) {
perror("socket");
exit(1);
}
/* connect to the server */
if (connect(sock, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
perror("connect");
close(sock);
exit(1);
}
/* find out who I am, now that we are connected and therefore bound */
namelen = sizeof(lsin);
if (getsockname(sock, (struct sockaddr *) &lsin, &namelen) < 0) {
perror("getsockname");
close(sock);
exit(1);
}
cksum_data.data = argv[1];
cksum_data.length = strlen(argv[1]);
if (retval = krb5_cc_default(context, &ccdef)) {
com_err(argv[0], retval, "while getting default ccache");
exit(1);
}
if (retval = krb5_cc_get_principal(context, ccdef, &client)) {
com_err(argv[0], retval, "while getting client principal name");
exit(1);
}
retval = krb5_sendauth(context, &auth_context, (krb5_pointer) &sock,
SAMPLE_VERSION, client, server,
AP_OPTS_MUTUAL_REQUIRED,
&cksum_data,
0, /* no creds, use ccache instead */
ccdef, &err_ret, &rep_ret, NULL);
krb5_free_principal(context, server); /* finished using it */
krb5_free_principal(context, client);
krb5_cc_close(context, ccdef);
krb5_auth_con_free(context, auth_context);
if (retval && retval != KRB5_SENDAUTH_REJECTED) {
com_err(argv[0], retval, "while using sendauth");
exit(1);
}
if (retval == KRB5_SENDAUTH_REJECTED) {
/* got an error */
printf("sendauth rejected, error reply is:\n\t\"%*s\"\n",
err_ret->text.length, err_ret->text.data);
} else if (rep_ret) {
/* got a reply */
krb5_free_ap_rep_enc_part(context, rep_ret);
printf("sendauth succeeded, reply is:\n");
if ((retval = krb5_net_read(context, sock, (char *)&xmitlen,
sizeof(xmitlen))) <= 0) {
if (retval == 0)
errno = ECONNABORTED;
com_err(argv[0], errno, "while reading data from server");
exit(1);
}
recv_data.length = ntohs(xmitlen);
if (!(recv_data.data = (char *)malloc(recv_data.length + 1))) {
com_err(argv[0], ENOMEM,
"while allocating buffer to read from server");
exit(1);
}
if ((retval = krb5_net_read(context, sock, (char *)recv_data.data,
recv_data.length)) <= 0) {
if (retval == 0)
errno = ECONNABORTED;
com_err(argv[0], errno, "while reading data from server");
exit(1);
}
recv_data.data[recv_data.length] = '\0';
printf("reply len %d, contents:\n%s\n",
recv_data.length,recv_data.data);
free(recv_data.data);
} else {
com_err(argv[0], 0, "no error or reply from sendauth!");
exit(1);
}
krb5_free_context(context);
exit(0);
}
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