515 lines
15 KiB
C
515 lines
15 KiB
C
/*
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* Copyright 1988 by the Massachusetts Institute of Technology.
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*
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* For copying and distribution information, please see the file
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* Copyright.MIT.
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*
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* Kerberos administration server client-side routines
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*/
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#if 0
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#ifndef lint
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static char rcsid_kadm_cli_wrap_c[] =
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"from: Id: kadm_cli_wrap.c,v 4.6 89/12/30 20:09:45 qjb Exp";
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static const char rcsid[] =
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"$Id: kadm_cli_wrap.c,v 1.5 1995/10/05 21:29:35 gibbs Exp $";
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#endif lint
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#endif
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/*
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* kadm_cli_wrap.c the client side wrapping of the calls to the admin server
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*/
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#include <unistd.h>
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#include <string.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <signal.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#include <kadm.h>
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#include <kadm_err.h>
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#include <krb_err.h>
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#ifndef NULL
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#define NULL 0
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#endif
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static Kadm_Client client_parm;
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/* Macros for use in returning data... used in kadm_cli_send */
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#define RET_N_FREE(r) {clear_secrets(); free((char *)act_st); free((char *)priv_pak); return r;}
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/* Keys for use in the transactions */
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static des_cblock sess_key; /* to be filled in by kadm_cli_keyd */
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static Key_schedule sess_sched;
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static void
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clear_secrets()
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{
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bzero((char *)sess_key, sizeof(sess_key));
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bzero((char *)sess_sched, sizeof(sess_sched));
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}
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/*
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* kadm_init_link
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* receives : name, inst, realm
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*
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* initializes client parm, the Kadm_Client structure which holds the
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* data about the connection between the server and client, the services
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* used, the locations and other fun things
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*/
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int
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kadm_init_link(n, i, r)
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char n[];
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char i[];
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char r[];
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{
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struct servent *sep; /* service we will talk to */
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struct hostent *hop; /* host we will talk to */
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char adm_hostname[MAXHOSTNAMELEN];
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(void) init_kadm_err_tbl();
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(void) init_krb_err_tbl();
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(void) strcpy(client_parm.sname, n);
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(void) strcpy(client_parm.sinst, i);
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(void) strcpy(client_parm.krbrlm, r);
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client_parm.admin_fd = -1;
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/* set up the admin_addr - fetch name of admin host */
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if (krb_get_admhst(adm_hostname, client_parm.krbrlm, 1) != KSUCCESS)
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return KADM_NO_HOST;
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if ((hop = gethostbyname(adm_hostname)) == NULL)
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return KADM_UNK_HOST; /* couldnt find the admin servers
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* address */
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if ((sep = getservbyname(KADM_SNAME, "tcp")) == NULL)
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return KADM_NO_SERV; /* couldnt find the admin service */
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bzero((char *) &client_parm.admin_addr,
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sizeof(client_parm.admin_addr));
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client_parm.admin_addr.sin_family = hop->h_addrtype;
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bcopy((char *) hop->h_addr, (char *) &client_parm.admin_addr.sin_addr,
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hop->h_length);
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client_parm.admin_addr.sin_port = sep->s_port;
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return KADM_SUCCESS;
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} /* procedure kadm_init_link */
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/*
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* kadm_change_pw
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* recieves : key
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*
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* Replaces the password (i.e. des key) of the caller with that specified in
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* key. Returns no actual data from the master server, since this is called
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* by a user
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*/
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int
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kadm_change_pw(newkey)
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des_cblock newkey; /* The DES form of the users key */
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{
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int stsize, retc; /* stream size and return code */
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u_char *send_st; /* send stream */
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u_char *ret_st;
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int ret_sz;
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u_long keytmp;
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if ((retc = kadm_cli_conn()) != KADM_SUCCESS)
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return(retc);
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/* possible problem with vts_long on a non-multiple of four boundary */
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stsize = 0; /* start of our output packet */
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send_st = (u_char *) malloc(1);/* to make it reallocable */
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send_st[stsize++] = (u_char) CHANGE_PW;
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/* change key to stream */
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bcopy((char *) (((long *) newkey) + 1), (char *) &keytmp, 4);
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keytmp = htonl(keytmp);
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stsize += vts_long(keytmp, &send_st, stsize);
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bcopy((char *) newkey, (char *) &keytmp, 4);
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keytmp = htonl(keytmp);
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stsize += vts_long(keytmp, &send_st, stsize);
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retc = kadm_cli_send(send_st, stsize, &ret_st, &ret_sz);
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free((char *)send_st);
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if (retc == KADM_SUCCESS) {
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free((char *)ret_st);
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}
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kadm_cli_disconn();
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return(retc);
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}
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/*
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* kadm_add
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* receives : vals
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* returns : vals
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*
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* Adds and entry containing values to the database returns the values of the
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* entry, so if you leave certain fields blank you will be able to determine
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* the default values they are set to
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*/
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int
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kadm_add(vals)
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Kadm_vals *vals;
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{
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u_char *st, *st2; /* st will hold the stream of values */
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int st_len; /* st2 the final stream with opcode */
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int retc; /* return code from call */
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u_char *ret_st;
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int ret_sz;
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if ((retc = kadm_cli_conn()) != KADM_SUCCESS)
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return(retc);
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st_len = vals_to_stream(vals, &st);
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st2 = (u_char *) malloc((unsigned)(1 + st_len));
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*st2 = (u_char) ADD_ENT; /* here's the opcode */
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bcopy((char *) st, (char *) st2 + 1, st_len); /* append st on */
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retc = kadm_cli_send(st2, st_len + 1, &ret_st, &ret_sz);
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free((char *)st);
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free((char *)st2);
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if (retc == KADM_SUCCESS) {
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/* ret_st has vals */
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if (stream_to_vals(ret_st, vals, ret_sz) < 0)
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retc = KADM_LENGTH_ERROR;
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free((char *)ret_st);
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}
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kadm_cli_disconn();
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return(retc);
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}
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/*
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* kadm_mod
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* receives : KTEXT, {values, values}
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* returns : CKSUM, RETCODE, {values}
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* acl : su, sms (as register or dealloc)
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*
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* Modifies all entries corresponding to the first values so they match the
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* second values. returns the values for the changed entries in vals2
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*/
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int
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kadm_mod(vals1, vals2)
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Kadm_vals *vals1;
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Kadm_vals *vals2;
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{
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u_char *st, *st2; /* st will hold the stream of values */
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int st_len, nlen; /* st2 the final stream with opcode */
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u_char *ret_st;
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int ret_sz;
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/* nlen is the length of second vals */
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int retc; /* return code from call */
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if ((retc = kadm_cli_conn()) != KADM_SUCCESS)
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return(retc);
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st_len = vals_to_stream(vals1, &st);
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st2 = (u_char *) malloc((unsigned)(1 + st_len));
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*st2 = (u_char) MOD_ENT; /* here's the opcode */
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bcopy((char *) st, (char *) st2 + 1, st_len++); /* append st on */
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free((char *)st);
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nlen = vals_to_stream(vals2, &st);
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st2 = (u_char *) realloc((char *) st2, (unsigned)(st_len + nlen));
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bcopy((char *) st, (char *) st2 + st_len, nlen); /* append st on */
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retc = kadm_cli_send(st2, st_len + nlen, &ret_st, &ret_sz);
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free((char *)st);
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free((char *)st2);
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if (retc == KADM_SUCCESS) {
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/* ret_st has vals */
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if (stream_to_vals(ret_st, vals2, ret_sz) < 0)
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retc = KADM_LENGTH_ERROR;
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free((char *)ret_st);
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}
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kadm_cli_disconn();
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return(retc);
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}
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/*
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* kadm_get
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* receives : KTEXT, {values, flags}
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* returns : CKSUM, RETCODE, {count, values, values, values}
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* acl : su
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*
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* gets the fields requested by flags from all entries matching values returns
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* this data for each matching recipient, after a count of how many such
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* matches there were
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*/
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int
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kadm_get(vals, fl)
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Kadm_vals *vals;
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u_char fl[4];
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{
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int loop; /* for copying the fields data */
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u_char *st, *st2; /* st will hold the stream of values */
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int st_len; /* st2 the final stream with opcode */
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int retc; /* return code from call */
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u_char *ret_st;
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int ret_sz;
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if ((retc = kadm_cli_conn()) != KADM_SUCCESS)
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return(retc);
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st_len = vals_to_stream(vals, &st);
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st2 = (u_char *) malloc((unsigned)(1 + st_len + FLDSZ));
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*st2 = (u_char) GET_ENT; /* here's the opcode */
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bcopy((char *) st, (char *) st2 + 1, st_len); /* append st on */
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for (loop = FLDSZ - 1; loop >= 0; loop--)
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*(st2 + st_len + FLDSZ - loop) = fl[loop]; /* append the flags */
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retc = kadm_cli_send(st2, st_len + 1 + FLDSZ, &ret_st, &ret_sz);
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free((char *)st);
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free((char *)st2);
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if (retc == KADM_SUCCESS) {
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/* ret_st has vals */
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if (stream_to_vals(ret_st, vals, ret_sz) < 0)
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retc = KADM_LENGTH_ERROR;
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free((char *)ret_st);
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}
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kadm_cli_disconn();
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return(retc);
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}
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/*
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* kadm_cli_send
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* recieves : opcode, packet, packet length, serv_name, serv_inst
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* returns : return code from the packet build, the server, or
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* something else
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*
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* It assembles a packet as follows:
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* 8 bytes : VERSION STRING
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* 4 bytes : LENGTH OF MESSAGE DATA and OPCODE
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* : KTEXT
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* : OPCODE \
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* : DATA > Encrypted (with make priv)
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* : ...... /
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*
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* If it builds the packet and it is small enough, then it attempts to open the
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* connection to the admin server. If the connection is succesfully open
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* then it sends the data and waits for a reply.
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*/
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int
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kadm_cli_send(st_dat, st_siz, ret_dat, ret_siz)
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u_char *st_dat; /* the actual data */
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int st_siz; /* length of said data */
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u_char **ret_dat; /* to give return info */
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int *ret_siz; /* length of returned info */
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{
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int act_len, retdat; /* current offset into packet, return
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* data */
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KTEXT_ST authent; /* the authenticator we will build */
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u_char *act_st; /* the pointer to the complete packet */
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u_char *priv_pak; /* private version of the packet */
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int priv_len; /* length of private packet */
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u_long cksum; /* checksum of the packet */
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MSG_DAT mdat;
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u_char *return_dat;
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act_st = (u_char *) malloc(KADM_VERSIZE); /* verstr stored first */
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(void) strncpy((char *)act_st, KADM_VERSTR, KADM_VERSIZE);
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act_len = KADM_VERSIZE;
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if ((retdat = kadm_cli_keyd(sess_key, sess_sched)) != KADM_SUCCESS) {
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free((char *)act_st);
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return retdat; /* couldnt get key working */
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}
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priv_pak = (u_char *) malloc((unsigned)(st_siz + 200));
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/* 200 bytes for extra info case */
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if ((priv_len = krb_mk_priv(st_dat, priv_pak, (u_long)st_siz,
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sess_sched, sess_key, &client_parm.my_addr,
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&client_parm.admin_addr)) < 0)
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RET_N_FREE(KADM_NO_ENCRYPT); /* whoops... we got a lose
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* here */
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/* here is the length of priv data. receiver calcs
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size of authenticator by subtracting vno size, priv size, and
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sizeof(u_long) (for the size indication) from total size */
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act_len += vts_long((u_long) priv_len, &act_st, act_len);
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#ifdef NOENCRYPTION
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cksum = 0;
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#else
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cksum = quad_cksum((des_cblock *)priv_pak, (des_cblock *)0,
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(long)priv_len, 0, (des_cblock *)sess_key);
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#endif
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if ((retdat = krb_mk_req(&authent, client_parm.sname, client_parm.sinst,
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client_parm.krbrlm, (long)cksum))) {
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/* authenticator? */
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RET_N_FREE(retdat + krb_err_base);
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}
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act_st = (u_char *) realloc((char *) act_st,
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(unsigned) (act_len + authent.length
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+ priv_len));
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if (!act_st) {
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clear_secrets();
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free((char *)priv_pak);
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return(KADM_NOMEM);
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}
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bcopy((char *) authent.dat, (char *) act_st + act_len, authent.length);
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bcopy((char *) priv_pak, (char *) act_st + act_len + authent.length,
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priv_len);
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free((char *)priv_pak);
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if ((retdat = kadm_cli_out(act_st,
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act_len + authent.length + priv_len,
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ret_dat, ret_siz)) != KADM_SUCCESS)
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RET_N_FREE(retdat);
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free((char *)act_st);
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#define RET_N_FREE2(r) {free((char *)*ret_dat); clear_secrets(); return(r);}
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/* first see if it's a YOULOUSE */
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if ((*ret_siz >= KADM_VERSIZE) &&
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!strncmp(KADM_ULOSE, (char *)*ret_dat, KADM_VERSIZE)) {
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u_long errcode;
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/* it's a youlose packet */
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if (*ret_siz < KADM_VERSIZE + sizeof(u_long))
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RET_N_FREE2(KADM_BAD_VER);
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bcopy((char *)(*ret_dat) + KADM_VERSIZE, (char *)&errcode,
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sizeof(u_long));
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retdat = (int) ntohl(errcode);
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RET_N_FREE2(retdat);
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}
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/* need to decode the ret_dat */
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if ((retdat = krb_rd_priv(*ret_dat, (u_long)*ret_siz, sess_sched,
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sess_key, &client_parm.admin_addr,
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&client_parm.my_addr, &mdat)))
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RET_N_FREE2(retdat+krb_err_base);
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if (mdat.app_length < KADM_VERSIZE + 4)
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/* too short! */
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RET_N_FREE2(KADM_BAD_VER);
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if (strncmp((char *)mdat.app_data, KADM_VERSTR, KADM_VERSIZE))
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/* bad version */
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RET_N_FREE2(KADM_BAD_VER);
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bcopy((char *)mdat.app_data+KADM_VERSIZE,
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(char *)&retdat, sizeof(u_long));
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retdat = ntohl((u_long)retdat);
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if (!(return_dat = (u_char *)malloc((unsigned)(mdat.app_length -
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KADM_VERSIZE - sizeof(u_long)))))
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RET_N_FREE2(KADM_NOMEM);
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bcopy((char *) mdat.app_data + KADM_VERSIZE + sizeof(u_long),
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(char *)return_dat,
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(int)mdat.app_length - KADM_VERSIZE - sizeof(u_long));
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free((char *)*ret_dat);
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clear_secrets();
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*ret_dat = return_dat;
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*ret_siz = mdat.app_length - KADM_VERSIZE - sizeof(u_long);
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return retdat;
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}
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/* takes in the sess_key and key_schedule and sets them appropriately */
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int
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kadm_cli_keyd(s_k, s_s)
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des_cblock s_k; /* session key */
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des_key_schedule s_s; /* session key schedule */
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{
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CREDENTIALS cred; /* to get key data */
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int stat;
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/* want .sname and .sinst here.... */
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if ((stat = krb_get_cred(client_parm.sname, client_parm.sinst,
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client_parm.krbrlm, &cred)))
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return stat + krb_err_base;
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bcopy((char *) cred.session, (char *) s_k, sizeof(des_cblock));
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bzero((char *) cred.session, sizeof(des_cblock));
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#ifdef NOENCRYPTION
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bzero(s_s, sizeof(des_key_schedule));
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#else
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if ((stat = key_sched((des_cblock *)s_k,s_s)))
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return(stat+krb_err_base);
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#endif
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return KADM_SUCCESS;
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} /* This code "works" */
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static sigtype (*opipe)();
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int
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kadm_cli_conn()
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{ /* this connects and sets my_addr */
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int on = 1;
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int kerror;
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if ((client_parm.admin_fd =
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socket(client_parm.admin_addr.sin_family, SOCK_STREAM,0)) < 0)
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return KADM_NO_SOCK; /* couldnt create the socket */
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client_parm.my_addr_len = sizeof(client_parm.my_addr);
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if ((kerror = krb_get_local_addr(&client_parm.my_addr)) != KSUCCESS) {
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(void) close(client_parm.admin_fd);
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client_parm.admin_fd = -1;
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return KADM_NO_HERE;
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}
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if (bind(client_parm.admin_fd,
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(struct sockaddr *) & client_parm.my_addr,
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sizeof(client_parm.my_addr))) {
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(void) close(client_parm.admin_fd);
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client_parm.admin_fd = -1;
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return KADM_NO_HERE;
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}
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if (connect(client_parm.admin_fd,
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(struct sockaddr *) & client_parm.admin_addr,
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sizeof(client_parm.admin_addr))) {
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(void) close(client_parm.admin_fd);
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client_parm.admin_fd = -1;
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return KADM_NO_CONN; /* couldnt get the connect */
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}
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opipe = signal(SIGPIPE, SIG_IGN);
|
|
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);
|
|
}
|
|
|
|
int
|
|
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;
|
|
}
|