303 lines
6.4 KiB
C
303 lines
6.4 KiB
C
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#ifndef lint
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static char sccsid[] = "@(#)chkey.c 2.3 88/08/15 4.0 RPCSRC";
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#endif
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/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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/*
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* Copyright (c) 1988 by Sun Microsystems, Inc.
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*/
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/*
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* Command to change one's public key in the public key database
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*/
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#include <stdio.h>
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#include <rpc/rpc.h>
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#include <rpc/key_prot.h>
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#include <rpcsvc/ypclnt.h>
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#include <sys/file.h>
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#include <pwd.h>
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#include <mp.h>
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extern char *getpass();
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extern char *index();
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extern char *crypt();
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extern char *sprintf();
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extern long random();
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static char PKMAP[] = "publickey.byname";
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static char *domain;
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struct passwd *ypgetpwuid();
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main(argc, argv)
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int argc;
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char **argv;
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{
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char name[MAXNETNAMELEN+1];
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char public[HEXKEYBYTES + 1];
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char secret[HEXKEYBYTES + 1];
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char crypt1[HEXKEYBYTES + KEYCHECKSUMSIZE + 1];
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char crypt2[HEXKEYBYTES + KEYCHECKSUMSIZE + 1];
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int status;
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char *pass;
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struct passwd *pw;
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char *master;
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int euid;
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int fd;
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int force;
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char *self;
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self = argv[0];
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force = 0;
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for (argc--, argv++; argc > 0 && **argv == '-'; argc--, argv++) {
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if (argv[0][2] != 0) {
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usage(self);
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}
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switch (argv[0][1]) {
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case 'f':
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force = 1;
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break;
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default:
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usage(self);
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}
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}
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if (argc != 0) {
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usage(self);
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}
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(void)yp_get_default_domain(&domain);
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if (yp_master(domain, PKMAP, &master) != 0) {
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(void)fprintf(stderr,
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"can't find master of publickey database\n");
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exit(1);
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}
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getnetname(name);
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(void)printf("Generating new key for %s.\n", name);
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euid = geteuid();
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if (euid != 0) {
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pw = ypgetpwuid(euid);
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if (pw == NULL) {
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(void)fprintf(stderr,
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"No yp password found: can't change key.\n");
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exit(1);
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}
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} else {
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pw = getpwuid(0);
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if (pw == NULL) {
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(void)fprintf(stderr,
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"No password found: can't change key.\n");
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exit(1);
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}
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}
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pass = getpass("Password:");
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if (!force) {
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if (strcmp(crypt(pass, pw->pw_passwd), pw->pw_passwd) != 0) {
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(void)fprintf(stderr, "Invalid password.\n");
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exit(1);
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}
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}
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genkeys(public, secret, pass);
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bcopy(secret, crypt1, HEXKEYBYTES);
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bcopy(secret, crypt1 + HEXKEYBYTES, KEYCHECKSUMSIZE);
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crypt1[HEXKEYBYTES + KEYCHECKSUMSIZE] = 0;
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xencrypt(crypt1, pass);
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if (force) {
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bcopy(crypt1, crypt2, HEXKEYBYTES + KEYCHECKSUMSIZE + 1);
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xdecrypt(crypt2, getpass("Retype password:"));
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if (bcmp(crypt2, crypt2 + HEXKEYBYTES, KEYCHECKSUMSIZE) != 0 ||
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bcmp(crypt2, secret, HEXKEYBYTES) != 0) {
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(void)fprintf(stderr, "Password incorrect.\n");
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exit(1);
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}
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}
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(void)printf("Sending key change request to %s...\n", master);
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status = setpublicmap(name, public, crypt1);
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if (status != 0) {
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(void)printf("%s: unable to update yp database (%u): %s\n",
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self, status, yperr_string(status));
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(void)printf("Perhaps %s is down?\n", master);
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exit(1);
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}
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(void)printf("Done.\n");
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if (key_setsecret(secret) < 0) {
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(void)printf("Unable to login with new secret key.\n");
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exit(1);
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}
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}
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usage(name)
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char *name;
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{
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(void)fprintf(stderr, "usage: %s [-f]\n", name);
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exit(1);
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}
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/*
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* Generate a seed
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*/
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getseed(seed, seedsize, pass)
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char *seed;
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int seedsize;
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unsigned char *pass;
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{
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int i;
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int rseed;
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struct timeval tv;
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(void)gettimeofday(&tv, (struct timezone *)NULL);
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rseed = tv.tv_sec + tv.tv_usec;
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for (i = 0; i < 8; i++) {
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rseed ^= (rseed << 8) | pass[i];
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}
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srandom(rseed);
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for (i = 0; i < seedsize; i++) {
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seed[i] = (random() & 0xff) ^ pass[i % 8];
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}
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}
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/*
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* Generate a random public/secret key pair
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*/
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genkeys(public, secret, pass)
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char *public;
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char *secret;
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char *pass;
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{
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int i;
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#define BASEBITS (8*sizeof(short) - 1)
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#define BASE (1 << BASEBITS)
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MINT *pk = itom(0);
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MINT *sk = itom(0);
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MINT *tmp;
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MINT *base = itom(BASE);
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MINT *root = itom(PROOT);
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MINT *modulus = xtom(HEXMODULUS);
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short r;
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unsigned short seed[KEYSIZE/BASEBITS + 1];
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char *xkey;
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getseed((char *)seed, sizeof(seed), (unsigned char *)pass);
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for (i = 0; i < KEYSIZE/BASEBITS + 1; i++) {
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r = seed[i] % BASE;
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tmp = itom(r);
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mult(sk, base, sk);
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madd(sk, tmp, sk);
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mfree(tmp);
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}
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tmp = itom(0);
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mdiv(sk, modulus, tmp, sk);
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mfree(tmp);
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pow(root, sk, modulus, pk);
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xkey = mtox(sk);
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adjust(secret, xkey);
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xkey = mtox(pk);
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adjust(public, xkey);
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mfree(sk);
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mfree(base);
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mfree(pk);
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mfree(root);
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mfree(modulus);
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}
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/*
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* Adjust the input key so that it is 0-filled on the left
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*/
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adjust(keyout, keyin)
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char keyout[HEXKEYBYTES+1];
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char *keyin;
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{
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char *p;
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char *s;
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for (p = keyin; *p; p++)
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;
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for (s = keyout + HEXKEYBYTES; p >= keyin; p--, s--) {
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*s = *p;
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}
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while (s >= keyout) {
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*s-- = '0';
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}
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}
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/*
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* Set the entry in the public key map
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*/
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setpublicmap(name, public, secret)
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char *name;
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char *public;
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char *secret;
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{
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char pkent[1024];
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u_int rslt;
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(void)sprintf(pkent,"%s:%s", public, secret);
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rslt = yp_update(domain, PKMAP, YPOP_STORE,
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name, strlen(name), pkent, strlen(pkent));
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return (rslt);
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}
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struct passwd *
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ypgetpwuid(uid)
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int uid;
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{
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char uidstr[10];
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char *val;
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int vallen;
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static struct passwd pw;
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char *p;
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(void)sprintf(uidstr, "%d", uid);
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if (yp_match(domain, "passwd.byuid", uidstr, strlen(uidstr),
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&val, &vallen) != 0) {
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return (NULL);
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}
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p = index(val, ':');
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if (p == NULL) {
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return (NULL);
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}
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pw.pw_passwd = p + 1;
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p = index(pw.pw_passwd, ':');
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if (p == NULL) {
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return (NULL);
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}
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*p = 0;
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return (&pw);
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}
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