freebsd/eBones/lib/libkadm/kadm_cli_wrap.c

/*
 * Copyright 1988 by the Massachusetts Institute of Technology.
 *
 * For copying and distribution information, please see the file
 * Copyright.MIT.
 *
 * Kerberos administration server client-side routines
 */

#if 0
#ifndef	lint
static char rcsid_kadm_cli_wrap_c[] =
"from: Id: kadm_cli_wrap.c,v 4.6 89/12/30 20:09:45 qjb Exp";
static const char rcsid[] =
	"$Id: kadm_cli_wrap.c,v 1.1 1995/07/18 16:40:23 mark Exp $";
#endif	lint
#endif

/*
 * kadm_cli_wrap.c the client side wrapping of the calls to the admin server
 */

#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <netdb.h>
#include <sys/socket.h>
#include <kadm.h>
#include <kadm_err.h>
#include <krb_err.h>

int kadm_cli_out(u_char *dat, int dat_len, u_char **ret_dat, int *ret_siz);
int kadm_cli_send(u_char *st_dat, int st_siz, u_char **ret_dat, int *ret_siz);
int kadm_cli_keyd(des_cblock *s_k, des_key_schedule s_s);
int kadm_cli_conn(void);
void kadm_cli_disconn(void);

#ifndef NULL
#define NULL 0
#endif

static Kadm_Client client_parm;

/* Macros for use in returning data... used in kadm_cli_send */
#define RET_N_FREE(r) {clear_secrets(); free((char *)act_st); free((char *)priv_pak); return r;}

/* Keys for use in the transactions */
static des_cblock sess_key;	       /* to be filled in by kadm_cli_keyd */
static Key_schedule sess_sched;

static void clear_secrets()
{
	bzero((char *)sess_key, sizeof(sess_key));
	bzero((char *)sess_sched, sizeof(sess_sched));
	return;
}

/*
 * kadm_init_link
 *	receives    : name, inst, realm
 *
 * initializes client parm, the Kadm_Client structure which holds the
 * data about the connection between the server and client, the services
 * used, the locations and other fun things
 */
int kadm_init_link(char n[], char i[], char r[])
{
	struct servent *sep;	       /* service we will talk to */
	struct hostent *hop;	       /* host we will talk to */
	char adm_hostname[MAXHOSTNAMELEN];

	(void) init_kadm_err_tbl();
	(void) init_krb_err_tbl();
	(void) strcpy(client_parm.sname, n);
	(void) strcpy(client_parm.sinst, i);
	(void) strcpy(client_parm.krbrlm, r);
	client_parm.admin_fd = -1;

	/* set up the admin_addr - fetch name of admin host */
	if (krb_get_admhst(adm_hostname, client_parm.krbrlm, 1) != KSUCCESS)
		return KADM_NO_HOST;
	if ((hop = gethostbyname(adm_hostname)) == NULL)
		return KADM_UNK_HOST;  /* couldnt find the admin servers
				        * address */
	if ((sep = getservbyname(KADM_SNAME, "tcp")) == NULL)
		return KADM_NO_SERV;   /* couldnt find the admin service */
	bzero((char *) &client_parm.admin_addr,
	      sizeof(client_parm.admin_addr));
	client_parm.admin_addr.sin_family = hop->h_addrtype;
	bcopy((char *) hop->h_addr, (char *) &client_parm.admin_addr.sin_addr,
	      hop->h_length);
	client_parm.admin_addr.sin_port = sep->s_port;

	return KADM_SUCCESS;
}				       /* procedure kadm_init_link */

/*
 * kadm_change_pw
 * recieves    : key
 *
 * Replaces the password (i.e. des key) of the caller with that specified in
 * key. Returns no actual data from the master server, since this is called
 * by a user
 */
int kadm_change_pw(des_cblock newkey)
{
	int stsize, retc;	       /* stream size and return code */
	u_char *send_st;	       /* send stream */
	u_char *ret_st;
	int ret_sz;
	u_long keytmp;

	if ((retc = kadm_cli_conn()) != KADM_SUCCESS)
	    return(retc);
	/* possible problem with vts_long on a non-multiple of four boundary */

	stsize = 0;		       /* start of our output packet */
	send_st = (u_char *) malloc(1);/* to make it reallocable */
	send_st[stsize++] = (u_char) CHANGE_PW;

	/* change key to stream */

	bcopy((char *) (((long *) newkey) + 1), (char *) &keytmp, 4);
	keytmp = htonl(keytmp);
	stsize += vts_long(keytmp, &send_st, stsize);

	bcopy((char *) newkey, (char *) &keytmp, 4);
	keytmp = htonl(keytmp);
	stsize += vts_long(keytmp, &send_st, stsize);

	retc = kadm_cli_send(send_st, stsize, &ret_st, &ret_sz);
	free((char *)send_st);
	if (retc == KADM_SUCCESS) {
	    free((char *)ret_st);
	}
	kadm_cli_disconn();
	return(retc);
}

/*
 * kadm_add
 * 	receives    : vals
 * 	returns     : vals
 *
 * Adds and entry containing values to the database returns the values of the
 * entry, so if you leave certain fields blank you will be able to determine
 * the default values they are set to
 */
int kadm_add(Kadm_vals *vals)
{
	u_char *st, *st2;	       /* st will hold the stream of values */
	int st_len;		       /* st2 the final stream with opcode */
	int retc;		       /* return code from call */
	u_char *ret_st;
	int ret_sz;

	if ((retc = kadm_cli_conn()) != KADM_SUCCESS)
	    return(retc);
	st_len = vals_to_stream(vals, &st);
	st2 = (u_char *) malloc((unsigned)(1 + st_len));
	*st2 = (u_char) ADD_ENT;       /* here's the opcode */
	bcopy((char *) st, (char *) st2 + 1, st_len);	/* append st on */
	retc = kadm_cli_send(st2, st_len + 1, &ret_st, &ret_sz);
	free((char *)st);
	free((char *)st2);
	if (retc == KADM_SUCCESS) {
	    /* ret_st has vals */
	    if (stream_to_vals(ret_st, vals, ret_sz) < 0)
		retc = KADM_LENGTH_ERROR;
	    free((char *)ret_st);
	}
	kadm_cli_disconn();
	return(retc);
}

/*
 * kadm_mod
 * 	receives    : KTEXT, {values, values}
 *	returns     : CKSUM,  RETCODE, {values}
 *	acl         : su, sms (as register or dealloc)
 *
 * Modifies all entries corresponding to the first values so they match the
 * second values. returns the values for the changed entries in vals2
 */
int kadm_mod(Kadm_vals *vals1, Kadm_vals *vals2)
{
	u_char *st, *st2;	       /* st will hold the stream of values */
	int st_len, nlen;	       /* st2 the final stream with opcode */
	u_char *ret_st;
	int ret_sz;

	/* nlen is the length of second vals */
	int retc;		       /* return code from call */

	if ((retc = kadm_cli_conn()) != KADM_SUCCESS)
	    return(retc);

	st_len = vals_to_stream(vals1, &st);
	st2 = (u_char *) malloc((unsigned)(1 + st_len));
	*st2 = (u_char) MOD_ENT;       /* here's the opcode */
	bcopy((char *) st, (char *) st2 + 1, st_len++);	/* append st on */
	free((char *)st);
	nlen = vals_to_stream(vals2, &st);
	st2 = (u_char *) realloc((char *) st2, (unsigned)(st_len + nlen));
	bcopy((char *) st, (char *) st2 + st_len, nlen); /* append st on */
	retc = kadm_cli_send(st2, st_len + nlen, &ret_st, &ret_sz);
	free((char *)st);
	free((char *)st2);
	if (retc == KADM_SUCCESS) {
	    /* ret_st has vals */
	    if (stream_to_vals(ret_st, vals2, ret_sz) < 0)
		retc = KADM_LENGTH_ERROR;
	    free((char *)ret_st);
	}
	kadm_cli_disconn();
	return(retc);
}

/*
 * kadm_get
 * 	receives   : KTEXT, {values, flags}
 *	returns    : CKSUM, RETCODE, {count, values, values, values}
 *	acl        : su
 *
 * gets the fields requested by flags from all entries matching values returns
 * this data for each matching recipient, after a count of how many such
 * matches there were
 */
int kadm_get(Kadm_vals *vals, u_char fl[4])
{
	int loop;		       /* for copying the fields data */
	u_char *st, *st2;	       /* st will hold the stream of values */
	int st_len;		       /* st2 the final stream with opcode */
	int retc;		       /* return code from call */
	u_char *ret_st;
	int ret_sz;

	if ((retc = kadm_cli_conn()) != KADM_SUCCESS)
	    return(retc);
	st_len = vals_to_stream(vals, &st);
	st2 = (u_char *) malloc((unsigned)(1 + st_len + FLDSZ));
	*st2 = (u_char) GET_ENT;       /* here's the opcode */
	bcopy((char *) st, (char *) st2 + 1, st_len);	/* append st on */
	for (loop = FLDSZ - 1; loop >= 0; loop--)
		*(st2 + st_len + FLDSZ - loop) = fl[loop]; /* append the flags */
	retc = kadm_cli_send(st2, st_len + 1 + FLDSZ,  &ret_st, &ret_sz);
	free((char *)st);
	free((char *)st2);
	if (retc == KADM_SUCCESS) {
	    /* ret_st has vals */
	    if (stream_to_vals(ret_st, vals, ret_sz) < 0)
		retc = KADM_LENGTH_ERROR;
	    free((char *)ret_st);
	}
	kadm_cli_disconn();
	return(retc);
}

/*
 * kadm_cli_send
 *	recieves   : opcode, packet, packet length, serv_name, serv_inst
 *	returns    : return code from the packet build, the server, or
 *			 something else
 *
 * It assembles a packet as follows:
 *	 8 bytes    : VERSION STRING
 *	 4 bytes    : LENGTH OF MESSAGE DATA and OPCODE
 *		    : KTEXT
 *		    : OPCODE       \
 *		    : DATA          > Encrypted (with make priv)
 *		    : ......       /
 *
 * If it builds the packet and it is small enough, then it attempts to open the
 * connection to the admin server.  If the connection is succesfully open
 * then it sends the data and waits for a reply.
 */
int kadm_cli_send(u_char *st_dat, int st_siz, u_char **ret_dat, int *ret_siz)
{
	int act_len, retdat;	       /* current offset into packet, return
				        * data */
	KTEXT_ST authent;	       /* the authenticator we will build */
	u_char *act_st;		       /* the pointer to the complete packet */
	u_char *priv_pak;	       /* private version of the packet */
	int priv_len;		       /* length of private packet */
	u_long cksum;		       /* checksum of the packet */
	MSG_DAT mdat;
	u_char *return_dat;

	act_st = (u_char *) malloc(KADM_VERSIZE); /* verstr stored first */
	(void) strncpy((char *)act_st, KADM_VERSTR, KADM_VERSIZE);
	act_len = KADM_VERSIZE;

	if ((retdat = kadm_cli_keyd(&sess_key, sess_sched)) != KADM_SUCCESS) {
		free((char *)act_st);
		return retdat;	       /* couldnt get key working */
	}
	priv_pak = (u_char *) malloc((unsigned)(st_siz + 200));
	/* 200 bytes for extra info case */
	if ((priv_len = krb_mk_priv(st_dat, priv_pak, (u_long)st_siz,
				    sess_sched, sess_key, &client_parm.my_addr,
				    &client_parm.admin_addr)) < 0)
		RET_N_FREE(KADM_NO_ENCRYPT);	/* whoops... we got a lose
						 * here */
	/* here is the length of priv data.  receiver calcs
	 size of authenticator by subtracting vno size, priv size, and
	 sizeof(u_long) (for the size indication) from total size */

	act_len += vts_long((u_long) priv_len, &act_st, act_len);
#ifdef NOENCRYPTION
	cksum = 0;
#else
	cksum = quad_cksum((des_cblock *)priv_pak, (des_cblock *)0,
		(long)priv_len, 0, &sess_key);
#endif
	if ((retdat = krb_mk_req(&authent, client_parm.sname, client_parm.sinst,
				client_parm.krbrlm, (long)cksum))) {
	    /* authenticator? */
	    RET_N_FREE(retdat + krb_err_base);
	}

	act_st = (u_char *) realloc((char *) act_st,
				    (unsigned) (act_len + authent.length
						+ priv_len));
	if (!act_st) {
	    clear_secrets();
	    free((char *)priv_pak);
	    return(KADM_NOMEM);
	}
	bcopy((char *) authent.dat, (char *) act_st + act_len, authent.length);
	bcopy((char *) priv_pak, (char *) act_st + act_len + authent.length,
	      priv_len);
	free((char *)priv_pak);
	if ((retdat = kadm_cli_out(act_st,
				   act_len + authent.length + priv_len,
				   ret_dat, ret_siz)) != KADM_SUCCESS)
	    RET_N_FREE(retdat);
	free((char *)act_st);
#define RET_N_FREE2(r) {free((char *)*ret_dat); clear_secrets(); return(r);}

	/* first see if it's a YOULOUSE */
	if ((*ret_siz >= KADM_VERSIZE) &&
	    !strncmp(KADM_ULOSE, (char *)*ret_dat, KADM_VERSIZE)) {
	    u_long errcode;
	    /* it's a youlose packet */
	    if (*ret_siz < KADM_VERSIZE + sizeof(u_long))
		RET_N_FREE2(KADM_BAD_VER);
	    bcopy((char *)(*ret_dat) + KADM_VERSIZE, (char *)&errcode,
		  sizeof(u_long));
	    retdat = (int) ntohl(errcode);
	    RET_N_FREE2(retdat);
	}
	/* need to decode the ret_dat */
	if ((retdat = krb_rd_priv(*ret_dat, (u_long)*ret_siz, sess_sched,
				 sess_key, &client_parm.admin_addr,
				 &client_parm.my_addr, &mdat)))
	    RET_N_FREE2(retdat+krb_err_base);
	if (mdat.app_length < KADM_VERSIZE + 4)
	    /* too short! */
	    RET_N_FREE2(KADM_BAD_VER);
	if (strncmp((char *)mdat.app_data, KADM_VERSTR, KADM_VERSIZE))
	    /* bad version */
	    RET_N_FREE2(KADM_BAD_VER);
	bcopy((char *)mdat.app_data+KADM_VERSIZE,
	      (char *)&retdat, sizeof(u_long));
	retdat = ntohl((u_long)retdat);
	if (!(return_dat = (u_char *)malloc((unsigned)(mdat.app_length -
					    KADM_VERSIZE - sizeof(u_long)))))
	    RET_N_FREE2(KADM_NOMEM);
	bcopy((char *) mdat.app_data + KADM_VERSIZE + sizeof(u_long),
	      (char *)return_dat,
	      (int)mdat.app_length - KADM_VERSIZE - sizeof(u_long));
	free((char *)*ret_dat);
	clear_secrets();
	*ret_dat = return_dat;
	*ret_siz = mdat.app_length - KADM_VERSIZE - sizeof(u_long);
	return retdat;
}

/* takes in the sess_key and key_schedule and sets them appropriately */
int kadm_cli_keyd(des_cblock *s_k, des_key_schedule s_s)
{
	CREDENTIALS cred;	       /* to get key data */
	int stat;

	/* want .sname and .sinst here.... */
	if ((stat = krb_get_cred(client_parm.sname, client_parm.sinst,
				client_parm.krbrlm, &cred)))
		return stat + krb_err_base;
	bcopy((char *) cred.session, (char *) s_k, sizeof(des_cblock));
	bzero((char *) cred.session, sizeof(des_cblock));
#ifdef NOENCRYPTION
	bzero(s_s, sizeof(des_key_schedule));
#else
	if ((stat = key_sched(s_k,s_s)))
		return(stat+krb_err_base);
#endif
	return KADM_SUCCESS;
}				       /* This code "works" */

static sigtype (*opipe)();

int kadm_cli_conn()
{					/* this connects and sets my_addr */
    int on = 1;

    if ((client_parm.admin_fd =
	 socket(client_parm.admin_addr.sin_family, SOCK_STREAM,0)) < 0)
	return KADM_NO_SOCK;		/* couldnt create the socket */
    if (connect(client_parm.admin_fd,
		(struct sockaddr *) & client_parm.admin_addr,
		sizeof(client_parm.admin_addr))) {
	(void) close(client_parm.admin_fd);
	client_parm.admin_fd = -1;
	return KADM_NO_CONN;		/* couldnt get the connect */
    }
    opipe = signal(SIGPIPE, SIG_IGN);
    client_parm.my_addr_len = sizeof(client_parm.my_addr);
    if (getsockname(client_parm.admin_fd,
		    (struct sockaddr *) & client_parm.my_addr,
		    &client_parm.my_addr_len) < 0) {
	(void) close(client_parm.admin_fd);
	client_parm.admin_fd = -1;
	(void) signal(SIGPIPE, opipe);
	return KADM_NO_HERE;		/* couldnt find out who we are */
    }
    if (setsockopt(client_parm.admin_fd, SOL_SOCKET, SO_KEEPALIVE, &on,
		   sizeof(on)) < 0) {
	(void) close(client_parm.admin_fd);
	client_parm.admin_fd = -1;
	(void) signal(SIGPIPE, opipe);
	return KADM_NO_CONN;		/* XXX */
    }
    return KADM_SUCCESS;
}

void kadm_cli_disconn()
{
    (void) close(client_parm.admin_fd);
    (void) signal(SIGPIPE, opipe);
    return;
}

int kadm_cli_out(u_char *dat, int dat_len, u_char **ret_dat, int *ret_siz)
{
	u_short dlen;
	int retval;

	dlen = (u_short) dat_len;

	if (dat_len != (int)dlen)
		return (KADM_NO_ROOM);

	dlen = htons(dlen);
	if (krb_net_write(client_parm.admin_fd, (char *) &dlen,
			  sizeof(u_short)) < 0)
		return (errno);	       /* XXX */

	if (krb_net_write(client_parm.admin_fd, (char *) dat, dat_len) < 0)
		return (errno);	       /* XXX */

	if ((retval = krb_net_read(client_parm.admin_fd, (char *) &dlen,
				  sizeof(u_short))) != sizeof(u_short)) {
	    if (retval < 0)
		return(errno);		/* XXX */
	    else
		return(EPIPE);		/* short read ! */
	}

	dlen = ntohs(dlen);
	*ret_dat = (u_char *)malloc((unsigned)dlen);
	if (!*ret_dat)
	    return(KADM_NOMEM);

	if ((retval = krb_net_read(client_parm.admin_fd, (char *) *ret_dat,
				  (int) dlen)) != dlen) {
	    if (retval < 0)
		return(errno);		/* XXX */
	    else
		return(EPIPE);		/* short read ! */
	}
	*ret_siz = (int) dlen;
	return KADM_SUCCESS;
}