[moira.git] / reg_svr / admin_call.c

/*
 *	$Source$
 *	$Author$
 *	$Header$
 *
 *	Copyright (C) 1987 by the Massachusetts Institute of Technology
 *
 *	Utility functions for communication with the Kerberos admin_server
 *
 * 	Original version written by Jeffery I. Schiller, January 1987
 *	Completely gutted and rewritten by Bill Sommerfeld, August 1987
 *
 *	$Log$
 *	Revision 1.5  1988-08-01 00:42:54  qjb
 *	Changed names of kerberos calls to new names from old ones.
 *
 * Revision 1.4  87/09/09  14:59:06  wesommer
 * Allocate a new socket each time rather than keeping one around, 
 * due to protocol problems.
 * 
 * Revision 1.3  87/09/04  22:30:34  wesommer
 * Un-crock the KDC host (oops -- this one got distributed!!).
 * 
 * Revision 1.2  87/08/22  17:13:59  wesommer
 * Make admin_errmsg external rather than static.
 * Crock up KDC host.
 * 
 * Revision 1.1  87/08/07  13:50:37  wesommer
 * Initial revision
 * 
 */

#ifndef lint
static char *rcsid_admin_call_c = "$Header$";
#endif lint

#include <sys/errno.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>

#include <netdb.h>
#include <strings.h>
#include <stdio.h>

#include "admin_err.h"
#include "admin_server.h"
#include "prot.h"
#include "krb.h"

extern int krb_err_base;	/* Offset between com_err and kerberos codes */
extern int errno;		/* System call error numbers */

extern long gethostid();

static u_char *strapp();		/* string append function */

static int inited = 0;		/* are we initialized? */
static int admin_fd = -1;	/* socket to talk to admin_server. */

static struct sockaddr_in admin_addr; /* address of admin server. */
static struct sockaddr_in my_addr;    /* address bound to admin_fd. */
static int my_addr_len;		/* size of above address. */

static char krbrlm[REALM_SZ];	/* Local kerberos realm */
char admin_errmsg[BUFSIZ]; /* Server error message */

/*
 * Initialize socket, etc. to use to talk to admin_server.
 */

int admin_call_init()
{
    register int status = 0;
    
    if (!inited) {
	struct hostent *hp;	/* host to talk to */
	struct servent *sp;	/* service to talk to */

	init_kadm_err_tbl();
	if (status = get_krbrlm(krbrlm, 1)) {
	    status += krb_err_base;
	    goto punt;
	}

	/*
	 * Locate server.
	 */

	hp = gethostbyname(KERB_HOST);
	if (!hp) {
	    status = ADMIN_UNKNOWN_HOST;
	    goto punt;
	}
	sp = getservbyname("atest3", "udp");
	if (!sp) {
	    status = ADMIN_UNKNOWN_SERVICE;
	    goto punt;
	}
	bzero((char *)&admin_addr, sizeof(admin_addr));
	admin_addr.sin_family = hp->h_addrtype;
	bcopy((char *)hp->h_addr, (char *)&admin_addr.sin_addr, hp->h_length);
	admin_addr.sin_port = sp->s_port;

	inited = 1;
    }
    return 0;
    
punt:
    (void) close(admin_fd);
    admin_fd = -1;
    return status;
}

/*
 * Build and transmit request to admin_server, and wait for
 * response from server.  Returns a standard error code.
 */

int
admin_call(opcode, pname, old_passwd, new_passwd, crypt_passwd)
    int opcode;
    char *pname;
    char *old_passwd;
    char *new_passwd;
    char *crypt_passwd;
{
    int status;
    register u_char *bp;	/* Pointer into buffer. */
    u_char *ep;			/* End of buffer pointer. */
    
    u_char pvt_buf[BUFSIZ];	/* private message plaintext */
    int pvt_len;		/* length of valid data in pvt_buf */

    u_char sealed_buf[BUFSIZ];	/* sealed version of private message */
    int sealed_len;		/* length of valid data in sealed_buf */
    
    u_long checksum;		/* quad_cksum of sealed request. */
    
    C_Block sess_key;		/* Session key. */
    Key_schedule sess_sched;	/* Key schedule for above. */
    
    CREDENTIALS cred;		/* Kerberos credentials. */
    KTEXT_ST authent;		/* Authenticator */
    KTEXT_ST reply;		/* Reply from admin_server */
    MSG_DAT msg_data;		/* Decrypted message */
    int attempts;		/* Number of retransmits so far */

    struct sockaddr rec_addr;	/* Address we got reply from */
    int rec_addr_len;		/* Length of that address */
    int on = 1;			/* ioctl argument */
	
    
    if (!inited) {
	status = admin_call_init();
	if (status) goto bad;
    }

    /*
     * assemble packet:
     *
     * sealed message consists of:
     * version number (one byte).
     * request code (one byte).
     * principal name (null terminated).
     * new password (in the clear, null terminated).
     * old password or instance (null terminated)
     * crypt(new password, seed) (null terminated).
     * an extra null.
     * a '\001' character.
     * This is all sealed inside a private_message, with an
     * authenticator tacked on in front.
     */

    bp = pvt_buf;
    ep = pvt_buf + sizeof(pvt_buf);
    
    *bp++ = PW_SRV_VERSION;
    *bp++ = opcode;
    if ((bp = strapp(bp, (u_char *)pname, ep)) &&
	(bp = strapp(bp, (u_char *)new_passwd, ep)) &&
	(bp = strapp(bp, (u_char *)old_passwd, ep)) &&
	(bp = strapp(bp, (u_char *)crypt_passwd, ep))) {
	*bp++ = '\0';
	*bp++ = '\1';
	pvt_len = bp - pvt_buf;
    } else {
	status = ADMIN_TOO_LONG;
	goto bad;
    }
    
    /*
     * find our session key.
     */

    if (status = krb_get_cred("changepw", "kerberos", krbrlm, &cred)) {
	status += krb_err_base;
	goto bad;
    }

    bcopy((char *)cred.session, (char *)sess_key, sizeof(sess_key));
    bzero((char *)cred.session, sizeof(sess_key)); /* lest we remember */

    if(key_sched(sess_key, sess_sched)) {
	status = ADMIN_BAD_KEY;
	goto bad;
    }

    /*
     * Set up socket.
     */

    admin_fd = socket(admin_addr.sin_family, SOCK_DGRAM, 0);
    if (admin_fd < 0) {
	status = errno;
	goto bad;
    }

    bzero((char *)&my_addr, sizeof(my_addr));
    
    my_addr.sin_family = admin_addr.sin_family;
    my_addr.sin_addr.s_addr = gethostid();

    if (bind(admin_fd, &my_addr, sizeof(my_addr)) < 0) {
	status = errno;
	goto bad;
    }

    my_addr_len = sizeof(my_addr);

    if (getsockname(admin_fd, (struct sockaddr *)&my_addr,
		    &my_addr_len) < 0) {
	status = errno;
	goto bad;
    }

    if (ioctl(admin_fd, FIONBIO, (char *)&on) < 0) {
	status = errno;
	goto bad;
    }
	
    /*
     * Encrypt the message using the session key.
     * Since this contains passwords, it must be kept from prying eyes.
     */

    sealed_len = krb_mk_priv(pvt_buf, sealed_buf, pvt_len,
				    sess_sched, sess_key, &my_addr,
				    &admin_addr);
    if (sealed_len < 0) {
	status = ADMIN_CANT_ENCRYPT;
	goto bad;
    }

    /*
     * Checksum the cypher text, to guard against tampering in flight.
     */

    checksum = quad_cksum(sealed_buf, NULL, sealed_len, 0, sess_key);
    
    /*
     * Make an authenticator, so the server can learn the session key
     * and know who we are.
     */

    if (status = krb_mk_req(&authent, "changepw", "kerberos", krbrlm,
			   checksum)) {
	status += krb_err_base;
	goto bad;
    }

    /*
     * Add the sealed message to the end of the authenticator.
     */

    if ((authent.length + sealed_len) > MAX_KTXT_LEN) {
	status = ADMIN_TOO_LONG;
	goto bad;
    }

    bcopy(sealed_buf, authent.dat + authent.length, sealed_len);
    authent.length += sealed_len;

    /*
     * send it off, and wait for a reply.
     */

    attempts = 0;
    
    while (attempts++ < RETRY_LIMIT) {
	int active;		/* number of active fds (from select). */
	fd_set set;		/* interesting fd's. */
	struct timeval timeout;	/* timeout on select. */
	
	if (sendto(admin_fd, (char *)authent.dat, authent.length,
		   0, &admin_addr, sizeof(admin_addr)) != authent.length) {
	    status = errno;
	    goto bad;
	}

	FD_ZERO(&set);
	FD_SET(admin_fd, &set);

	timeout.tv_sec = USER_TIMEOUT;
	timeout.tv_usec = 0;
	    
	active = select(admin_fd+1, &set, (fd_set *)0, (fd_set *)0, &timeout);
	if (active < 0) {
	    status = errno;
	    goto bad;
	} else if (active == 0) continue;
	else {
	    reply.length = recvfrom(admin_fd, (char *)reply.dat,
				    sizeof(reply.dat), 0,
				    &rec_addr, &rec_addr_len);
	    if (reply.length < 0) continue;
#ifdef notdef
	    if (!bcmp(&rec_addr, &admin_addr, sizeof(admin_addr)))
		/* the spoofers are out in force.. */
		continue;
#endif notdef
	    break;		/* got one.. */
	}
    }

    if (attempts > RETRY_LIMIT) {
	status = ETIMEDOUT;
	goto bad;
    }

    if (pkt_version((&reply)) != KRB_PROT_VERSION) {
	status = ADMIN_BAD_VERSION;
	goto bad;
    }

    if ((pkt_msg_type((&reply)) & ~1) != AUTH_MSG_PRIVATE) {
	bp = reply.dat;
	if (*bp++ != KRB_PROT_VERSION) {
	    status = ADMIN_BAD_VERSION;
	    goto bad;
	}
	if (*bp++ != AUTH_MSG_ERR_REPLY) {
	    status = ADMIN_UNKNOWN_CODE;
	    goto bad;
	}
	bp += strlen((char *)bp) + 1;	/* Skip name */
	bp += strlen((char *)bp) + 1;	/* Skip instance */
	bp += strlen((char *)bp) + 1;	/* Skip realm */

	/* null-terminate error string */
	reply.dat[reply.length] = '\0'; 

	if (*bp++ == 126) {
	    status = ADMIN_SERVER_ERROR;
	    strcpy(admin_errmsg, bp);
	    goto bad;
	} else {
	    status = ADMIN_UNKNOWN_CODE;
	    goto bad;
	}
    }
    status = krb_rd_priv(reply.dat, reply.length,
			    sess_sched, sess_key,
			    &admin_addr, &my_addr,
			    &msg_data);
    if (status) {
	status += krb_err_base;
	goto bad;
    }
    bp = msg_data.app_data;

    if (*bp++ != PW_SRV_VERSION) {
	status = ADMIN_BAD_VERSION;
	goto bad;
    }
    if (*bp++ != INSTALL_REPLY) {
	status = ADMIN_UNKNOWN_CODE;
	goto bad;
    }

    status = 0;
    /* fall through into cleanup */

bad:
    /*
     * Paranoia: shred all the incriminating evidence.
     * We'll let the caller shred the arguments.
     */
    bzero((char *)sess_key, sizeof(sess_key));
    bzero((char *)sess_sched, sizeof(sess_sched));
    bzero(pvt_buf, sizeof(pvt_buf));
        
    if (admin_fd >= 0) {
	(void) close(admin_fd);
	admin_fd = -1;
    }

    return status;
}

/*
 * Copies characters from source to dest, returning a pointer to the
 * point in dest after the last character copied from source.
 * If this would be greater than end, no characters are copied, and NULL
 * is returned instead.
 */

static u_char *strapp(dest, source, end)
    register u_char *dest, *source, *end;
{
    register int length = strlen(source) + 1;
    if (dest+length > end) return NULL;
    else {
	bcopy(source, dest, length);
	return dest + length;
    }
}

/*
 * Local Variables:
 * mode: c
 * c-indent-level: 4
 * c-continued-statement-offset: 4
 * c-brace-offset: -4
 * c-argdecl-indent: 4
 * c-label-offset: -4
 * End:
 */
Commit	Line	Data
718bc25c	1	/*
	2	* $Source$
	3	* $Author$
	4	* $Header$
	5	*
	6	* Copyright (C) 1987 by the Massachusetts Institute of Technology
	7	*
	8	* Utility functions for communication with the Kerberos admin_server
	9	*
	10	* Original version written by Jeffery I. Schiller, January 1987
	11	* Completely gutted and rewritten by Bill Sommerfeld, August 1987
	12	*
	13	* $Log$
e5fdb505	14	* Revision 1.5 1988-08-01 00:42:54 qjb
e5fdb505	15	* Changed names of kerberos calls to new names from old ones.
718bc25c	16	*
e5fdb505	17	* Revision 1.4 87/09/09 14:59:06 wesommer
	18	* Allocate a new socket each time rather than keeping one around,
	19	* due to protocol problems.
	20	*
3004ebdb	21	* Revision 1.3 87/09/04 22:30:34 wesommer
	22	* Un-crock the KDC host (oops -- this one got distributed!!).
	23	*
56d50401	24	* Revision 1.2 87/08/22 17:13:59 wesommer
	25	* Make admin_errmsg external rather than static.
	26	* Crock up KDC host.
	27	*
074685e3	28	* Revision 1.1 87/08/07 13:50:37 wesommer
	29	* Initial revision
	30	*
718bc25c	31	*/
	32
	33	#ifndef lint
	34	static char *rcsid_admin_call_c = "$Header$";
	35	#endif lint
	36
	37	#include <sys/errno.h>
	38	#include <sys/types.h>
	39	#include <sys/time.h>
	40	#include <sys/ioctl.h>
	41	#include <sys/socket.h>
	42	#include <netinet/in.h>
	43
	44	#include <netdb.h>
	45	#include <strings.h>
	46	#include <stdio.h>
	47
	48	#include "admin_err.h"
	49	#include "admin_server.h"
	50	#include "prot.h"
	51	#include "krb.h"
	52
	53	extern int krb_err_base; /* Offset between com_err and kerberos codes */
	54	extern int errno; /* System call error numbers */
	55
	56	extern long gethostid();
	57
	58	static u_char strapp(); / string append function */
	59
	60	static int inited = 0; /* are we initialized? */
	61	static int admin_fd = -1; /* socket to talk to admin_server. */
	62
	63	static struct sockaddr_in admin_addr; /* address of admin server. */
	64	static struct sockaddr_in my_addr; /* address bound to admin_fd. */
	65	static int my_addr_len; /* size of above address. */
	66
	67	static char krbrlm[REALM_SZ]; /* Local kerberos realm */
074685e3	68	char admin_errmsg[BUFSIZ]; /* Server error message */
718bc25c	69
	70	/*
	71	* Initialize socket, etc. to use to talk to admin_server.
	72	*/
	73
	74	int admin_call_init()
	75	{
	76	register int status = 0;
	77
	78	if (!inited) {
	79	struct hostent hp; / host to talk to */
	80	struct servent sp; / service to talk to */
3004ebdb	81
718bc25c	82	init_kadm_err_tbl();
	83	if (status = get_krbrlm(krbrlm, 1)) {
	84	status += krb_err_base;
	85	goto punt;
	86	}
	87
	88	/*
	89	* Locate server.
	90	*/
	91
	92	hp = gethostbyname(KERB_HOST);
	93	if (!hp) {
	94	status = ADMIN_UNKNOWN_HOST;
	95	goto punt;
	96	}
	97	sp = getservbyname("atest3", "udp");
	98	if (!sp) {
	99	status = ADMIN_UNKNOWN_SERVICE;
	100	goto punt;
	101	}
	102	bzero((char *)&admin_addr, sizeof(admin_addr));
	103	admin_addr.sin_family = hp->h_addrtype;
	104	bcopy((char )hp->h_addr, (char )&admin_addr.sin_addr, hp->h_length);
	105	admin_addr.sin_port = sp->s_port;
	106
718bc25c	107	inited = 1;
	108	}
	109	return 0;
	110
	111	punt:
	112	(void) close(admin_fd);
	113	admin_fd = -1;
	114	return status;
	115	}
	116
	117	/*
	118	* Build and transmit request to admin_server, and wait for
	119	* response from server. Returns a standard error code.
	120	*/
	121
	122	int
	123	admin_call(opcode, pname, old_passwd, new_passwd, crypt_passwd)
	124	int opcode;
	125	char *pname;
	126	char *old_passwd;
	127	char *new_passwd;
	128	char *crypt_passwd;
	129	{
	130	int status;
	131	register u_char bp; / Pointer into buffer. */
	132	u_char ep; / End of buffer pointer. */
	133
	134	u_char pvt_buf[BUFSIZ]; /* private message plaintext */
	135	int pvt_len; /* length of valid data in pvt_buf */
	136
	137	u_char sealed_buf[BUFSIZ]; /* sealed version of private message */
	138	int sealed_len; /* length of valid data in sealed_buf */
	139
	140	u_long checksum; /* quad_cksum of sealed request. */
	141
	142	C_Block sess_key; /* Session key. */
	143	Key_schedule sess_sched; /* Key schedule for above. */
	144
	145	CREDENTIALS cred; /* Kerberos credentials. */
	146	KTEXT_ST authent; /* Authenticator */
	147	KTEXT_ST reply; /* Reply from admin_server */
	148	MSG_DAT msg_data; /* Decrypted message */
	149	int attempts; /* Number of retransmits so far */
	150
	151	struct sockaddr rec_addr; /* Address we got reply from */
	152	int rec_addr_len; /* Length of that address */
3004ebdb	153	int on = 1; /* ioctl argument */
3004ebdb	154
718bc25c	155
	156	if (!inited) {
	157	status = admin_call_init();
	158	if (status) goto bad;
	159	}
	160
	161	/*
	162	* assemble packet:
	163	*
	164	* sealed message consists of:
	165	* version number (one byte).
	166	* request code (one byte).
	167	* principal name (null terminated).
	168	* new password (in the clear, null terminated).
	169	* old password or instance (null terminated)
	170	* crypt(new password, seed) (null terminated).
	171	* an extra null.
	172	* a '\001' character.
	173	* This is all sealed inside a private_message, with an
	174	* authenticator tacked on in front.
	175	*/
	176
	177	bp = pvt_buf;
	178	ep = pvt_buf + sizeof(pvt_buf);
	179
	180	*bp++ = PW_SRV_VERSION;
	181	*bp++ = opcode;
	182	if ((bp = strapp(bp, (u_char *)pname, ep)) &&
	183	(bp = strapp(bp, (u_char *)new_passwd, ep)) &&
	184	(bp = strapp(bp, (u_char *)old_passwd, ep)) &&
	185	(bp = strapp(bp, (u_char *)crypt_passwd, ep))) {
	186	*bp++ = '\0';
	187	*bp++ = '\1';
	188	pvt_len = bp - pvt_buf;
	189	} else {
	190	status = ADMIN_TOO_LONG;
	191	goto bad;
	192	}
	193
	194	/*
	195	* find our session key.
	196	*/
	197
e5fdb505	198	if (status = krb_get_cred("changepw", "kerberos", krbrlm, &cred)) {
718bc25c	199	status += krb_err_base;
	200	goto bad;
	201	}
	202
	203	bcopy((char )cred.session, (char )sess_key, sizeof(sess_key));
	204	bzero((char )cred.session, sizeof(sess_key)); / lest we remember */
	205
	206	if(key_sched(sess_key, sess_sched)) {
	207	status = ADMIN_BAD_KEY;
	208	goto bad;
	209	}
	210
3004ebdb	211	/*
	212	* Set up socket.
	213	*/
	214
	215	admin_fd = socket(admin_addr.sin_family, SOCK_DGRAM, 0);
	216	if (admin_fd < 0) {
	217	status = errno;
	218	goto bad;
	219	}
	220
	221	bzero((char *)&my_addr, sizeof(my_addr));
	222
	223	my_addr.sin_family = admin_addr.sin_family;
	224	my_addr.sin_addr.s_addr = gethostid();
	225
	226	if (bind(admin_fd, &my_addr, sizeof(my_addr)) < 0) {
	227	status = errno;
	228	goto bad;
	229	}
	230
	231	my_addr_len = sizeof(my_addr);
	232
	233	if (getsockname(admin_fd, (struct sockaddr *)&my_addr,
	234	&my_addr_len) < 0) {
	235	status = errno;
	236	goto bad;
	237	}
	238
	239	if (ioctl(admin_fd, FIONBIO, (char *)&on) < 0) {
	240	status = errno;
	241	goto bad;
	242	}
	243
718bc25c	244	/*
	245	* Encrypt the message using the session key.
	246	* Since this contains passwords, it must be kept from prying eyes.
	247	*/
	248
e5fdb505	249	sealed_len = krb_mk_priv(pvt_buf, sealed_buf, pvt_len,
718bc25c	250	sess_sched, sess_key, &my_addr,
	251	&admin_addr);
	252	if (sealed_len < 0) {
	253	status = ADMIN_CANT_ENCRYPT;
	254	goto bad;
	255	}
	256
	257	/*
	258	* Checksum the cypher text, to guard against tampering in flight.
	259	*/
	260
	261	checksum = quad_cksum(sealed_buf, NULL, sealed_len, 0, sess_key);
	262
	263	/*
	264	* Make an authenticator, so the server can learn the session key
	265	* and know who we are.
	266	*/
	267
e5fdb505	268	if (status = krb_mk_req(&authent, "changepw", "kerberos", krbrlm,
718bc25c	269	checksum)) {
	270	status += krb_err_base;
	271	goto bad;
	272	}
	273
	274	/*
	275	* Add the sealed message to the end of the authenticator.
	276	*/
	277
	278	if ((authent.length + sealed_len) > MAX_KTXT_LEN) {
	279	status = ADMIN_TOO_LONG;
	280	goto bad;
	281	}
	282
	283	bcopy(sealed_buf, authent.dat + authent.length, sealed_len);
	284	authent.length += sealed_len;
	285
	286	/*
	287	* send it off, and wait for a reply.
	288	*/
	289
	290	attempts = 0;
	291
	292	while (attempts++ < RETRY_LIMIT) {
	293	int active; /* number of active fds (from select). */
	294	fd_set set; /* interesting fd's. */
	295	struct timeval timeout; /* timeout on select. */
	296
	297	if (sendto(admin_fd, (char *)authent.dat, authent.length,
	298	0, &admin_addr, sizeof(admin_addr)) != authent.length) {
	299	status = errno;
	300	goto bad;
	301	}
	302
	303	FD_ZERO(&set);
	304	FD_SET(admin_fd, &set);
	305
	306	timeout.tv_sec = USER_TIMEOUT;
	307	timeout.tv_usec = 0;
	308
	309	active = select(admin_fd+1, &set, (fd_set )0, (fd_set )0, &timeout);
	310	if (active < 0) {
	311	status = errno;
	312	goto bad;
	313	} else if (active == 0) continue;
	314	else {
	315	reply.length = recvfrom(admin_fd, (char *)reply.dat,
	316	sizeof(reply.dat), 0,
	317	&rec_addr, &rec_addr_len);
	318	if (reply.length < 0) continue;
	319	#ifdef notdef
	320	if (!bcmp(&rec_addr, &admin_addr, sizeof(admin_addr)))
	321	/* the spoofers are out in force.. */
	322	continue;
	323	#endif notdef
	324	break; /* got one.. */
	325	}
	326	}
	327
	328	if (attempts > RETRY_LIMIT) {
	329	status = ETIMEDOUT;
	330	goto bad;
	331	}
	332
333	if (pkt_version((&reply)) != KRB_PROT_VERSION) {
334	status = ADMIN_BAD_VERSION;
335	goto bad;
336	}
337
338	if ((pkt_msg_type((&reply)) & ~1) != AUTH_MSG_PRIVATE) {
339	bp = reply.dat;
340	if (*bp++ != KRB_PROT_VERSION) {
341	status = ADMIN_BAD_VERSION;
342	goto bad;
343	}
344	if (*bp++ != AUTH_MSG_ERR_REPLY) {
345	status = ADMIN_UNKNOWN_CODE;
346	goto bad;
347	}
348	bp += strlen((char )bp) + 1; / Skip name */
349	bp += strlen((char )bp) + 1; / Skip instance */
350	bp += strlen((char )bp) + 1; / Skip realm */
351
352	/* null-terminate error string */
353	reply.dat[reply.length] = '\0';
354
355	if (*bp++ == 126) {
356	status = ADMIN_SERVER_ERROR;
357	strcpy(admin_errmsg, bp);
358	goto bad;
359	} else {
360	status = ADMIN_UNKNOWN_CODE;
361	goto bad;
362	}
363	}
e5fdb505	364	status = krb_rd_priv(reply.dat, reply.length,
718bc25c	365	sess_sched, sess_key,
	366	&admin_addr, &my_addr,
	367	&msg_data);
	368	if (status) {
	369	status += krb_err_base;
	370	goto bad;
	371	}
	372	bp = msg_data.app_data;
	373
	374	if (*bp++ != PW_SRV_VERSION) {
	375	status = ADMIN_BAD_VERSION;
	376	goto bad;
	377	}
	378	if (*bp++ != INSTALL_REPLY) {
	379	status = ADMIN_UNKNOWN_CODE;
	380	goto bad;
	381	}
	382
	383	status = 0;
	384	/* fall through into cleanup */
	385
	386	bad:
	387	/*
	388	* Paranoia: shred all the incriminating evidence.
	389	* We'll let the caller shred the arguments.
	390	*/
	391	bzero((char *)sess_key, sizeof(sess_key));
	392	bzero((char *)sess_sched, sizeof(sess_sched));
	393	bzero(pvt_buf, sizeof(pvt_buf));
3004ebdb	394
	395	if (admin_fd >= 0) {
	396	(void) close(admin_fd);
	397	admin_fd = -1;
	398	}
	399
718bc25c	400	return status;
	401	}
	402
	403	/*
	404	* Copies characters from source to dest, returning a pointer to the
	405	* point in dest after the last character copied from source.
	406	* If this would be greater than end, no characters are copied, and NULL
	407	* is returned instead.
	408	*/
	409
	410	static u_char *strapp(dest, source, end)
	411	register u_char dest, source, *end;
	412	{
	413	register int length = strlen(source) + 1;
	414	if (dest+length > end) return NULL;
	415	else {
	416	bcopy(source, dest, length);
	417	return dest + length;
	418	}
	419	}
	420
	421	/*
	422	* Local Variables:
	423	* mode: c
	424	* c-indent-level: 4
	425	* c-continued-statement-offset: 4
	426	* c-brace-offset: -4
	427	* c-argdecl-indent: 4
	428	* c-label-offset: -4
	429	* End:
	430	*/