freebsd-dev/eBones/lib/libkadm/kadm_cli_wrap.c
Garrett Wollman a15e22a637 Add the library used by kadmin' and kadmind'. Oddly enough, this
little library is actually exportable (we think) even though it's pretty
useless iwithout the (non-exportable) clients.
1995-01-20 02:02:54 +00:00

500 lines
15 KiB
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
*/
#ifndef lint
#if 0
static char rcsid_kadm_cli_wrap_c[] =
"from: Id: kadm_cli_wrap.c,v 4.6 89/12/30 20:09:45 qjb Exp";
#endif
static const char rcsid[] =
"$Id$";
#endif lint
/*
* kadm_cli_wrap.c the client side wrapping of the calls to the admin server
*/
#include <sys/types.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>
#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
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
*/
kadm_init_link(n, i, r)
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
*/
kadm_change_pw(newkey)
des_cblock newkey; /* The DES form of the users key */
{
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
*/
kadm_add(vals)
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
*/
kadm_mod(vals1, vals2)
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
*/
kadm_get(vals, fl)
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.
*/
kadm_cli_send(st_dat, st_siz, ret_dat, ret_siz)
u_char *st_dat; /* the actual data */
int st_siz; /* length of said data */
u_char **ret_dat; /* to give return info */
int *ret_siz; /* length of returned info */
{
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(priv_pak, (u_long *)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 */
kadm_cli_keyd(s_k, s_s)
des_cblock s_k; /* session key */
des_key_schedule s_s; /* session key schedule */
{
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)();
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;
}
kadm_cli_disconn()
{
(void) close(client_parm.admin_fd);
(void) signal(SIGPIPE, opipe);
return;
}
kadm_cli_out(dat, dat_len, ret_dat, ret_siz)
u_char *dat;
int dat_len;
u_char **ret_dat;
int *ret_siz;
{
extern int errno;
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;
}