480 lines
12 KiB
C
480 lines
12 KiB
C
/*
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* Copyright 1985, 1986, 1987, 1988 by the Massachusetts Institute
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* of Technology.
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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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* This routine changes the Kerberos encryption keys for principals,
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* i.e., users or services.
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*
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* from: kdb_edit.c,v 4.2 90/01/09 16:05:09 raeburn Exp $
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* $Id: kdb_edit.c,v 1.5 1995/09/07 21:37:17 markm Exp $
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*/
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/*
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* exit returns 0 ==> success -1 ==> error
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*/
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#if 0
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#ifndef lint
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static char rcsid[] =
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"$Id: kdb_edit.c,v 1.5 1995/09/07 21:37:17 markm Exp $";
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#endif lint
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#endif
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#include <stdio.h>
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#include <signal.h>
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#include <errno.h>
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#include <strings.h>
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#include <sys/ioctl.h>
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#include <sys/file.h>
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#include "time.h"
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#include <des.h>
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#include <krb.h>
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#include <krb_db.h>
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/* MKEYFILE is now defined in kdc.h */
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#include <kdc.h>
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void Usage(void);
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void cleanup(void);
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void sig_exit(int sig, int code, struct sigcontext *scp);
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void no_core_dumps(void);
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int change_principal(void);
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#define zaptime(foo) bzero((char *)(foo), sizeof(*(foo)))
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char prog[32];
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char *progname = prog;
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int nflag = 0;
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int cflag;
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int lflag;
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int uflag;
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int debug;
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extern kerb_debug;
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Key_schedule KS;
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C_Block new_key;
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unsigned char *input;
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unsigned char *ivec;
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int i, j;
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int more;
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char *in_ptr;
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char input_name[ANAME_SZ];
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char input_instance[INST_SZ];
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char input_string[ANAME_SZ];
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#define MAX_PRINCIPAL 10
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Principal principal_data[MAX_PRINCIPAL];
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static Principal old_principal;
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static Principal default_princ;
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static C_Block master_key;
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static C_Block session_key;
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static Key_schedule master_key_schedule;
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static char pw_str[255];
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static long master_key_version;
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/*
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* gets replacement
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*/
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static char * s_gets(char * str, int len)
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{
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int i;
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char *s;
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if((s = fgets(str, len, stdin)) == NULL)
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return(s);
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if(str[i = (strlen(str)-1)] == '\n')
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str[i] = '\0';
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return(s);
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}
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int
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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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/* Local Declarations */
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long n;
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prog[sizeof prog - 1] = '\0'; /* make sure terminated */
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strncpy(prog, argv[0], sizeof prog - 1); /* salt away invoking
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* program */
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/* Assume a long is four bytes */
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if (sizeof(long) != 4) {
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fprintf(stdout, "%s: size of long is %d.\n", prog, sizeof(long));
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exit(-1);
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}
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/* Assume <=32 signals */
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if (NSIG > 32) {
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fprintf(stderr, "%s: more than 32 signals defined.\n", prog);
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exit(-1);
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}
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while (--argc > 0 && (*++argv)[0] == '-')
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for (i = 1; argv[0][i] != '\0'; i++) {
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switch (argv[0][i]) {
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/* debug flag */
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case 'd':
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debug = 1;
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continue;
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/* debug flag */
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case 'l':
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kerb_debug |= 1;
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continue;
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case 'n': /* read MKEYFILE for master key */
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nflag = 1;
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continue;
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default:
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fprintf(stderr, "%s: illegal flag \"%c\"\n",
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progname, argv[0][i]);
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Usage(); /* Give message and die */
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}
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};
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fprintf(stdout, "Opening database...\n");
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fflush(stdout);
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kerb_init();
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if (argc > 0) {
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if (kerb_db_set_name(*argv) != 0) {
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fprintf(stderr, "Could not open altername database name\n");
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exit(1);
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}
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}
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#ifdef notdef
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no_core_dumps(); /* diddle signals to avoid core dumps! */
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/* ignore whatever is reasonable */
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signal(SIGHUP, SIG_IGN);
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signal(SIGINT, SIG_IGN);
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signal(SIGTSTP, SIG_IGN);
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#endif
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if (kdb_get_master_key ((nflag == 0),
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master_key, master_key_schedule) != 0) {
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fprintf (stdout, "Couldn't read master key.\n");
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fflush (stdout);
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exit (-1);
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}
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if ((master_key_version = kdb_verify_master_key(master_key,
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master_key_schedule,
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stdout)) < 0)
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exit (-1);
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des_init_random_number_generator(master_key);
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/* lookup the default values */
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n = kerb_get_principal(KERB_DEFAULT_NAME, KERB_DEFAULT_INST,
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&default_princ, 1, &more);
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if (n != 1) {
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fprintf(stderr,
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"%s: Kerberos error on default value lookup, %ld found.\n",
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progname, n);
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exit(-1);
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}
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fprintf(stdout, "Previous or default values are in [brackets] ,\n");
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fprintf(stdout, "enter return to leave the same, or new value.\n");
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while (change_principal()) {
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}
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cleanup();
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return(0); /* make -Wall shut up - MRVM */
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}
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int
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change_principal()
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{
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static char temp[255];
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int creating = 0;
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int editpw = 0;
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int changed = 0;
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long temp_long;
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int n;
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struct tm *tp, edate, *localtime();
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long maketime();
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fprintf(stdout, "\nPrincipal name: ");
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fflush(stdout);
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if (!s_gets(input_name, ANAME_SZ-1) || *input_name == '\0')
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return 0;
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fprintf(stdout, "Instance: ");
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fflush(stdout);
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/* instance can be null */
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s_gets(input_instance, INST_SZ-1);
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j = kerb_get_principal(input_name, input_instance, principal_data,
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MAX_PRINCIPAL, &more);
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if (!j) {
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fprintf(stdout, "\n\07\07<Not found>, Create [y] ? ");
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s_gets(temp, sizeof(temp)-1); /* Default case should work, it didn't */
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if (temp[0] != 'y' && temp[0] != 'Y' && temp[0] != '\0')
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return -1;
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/* make a new principal, fill in defaults */
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j = 1;
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creating = 1;
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strcpy(principal_data[0].name, input_name);
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strcpy(principal_data[0].instance, input_instance);
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principal_data[0].old = NULL;
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principal_data[0].exp_date = default_princ.exp_date;
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principal_data[0].max_life = default_princ.max_life;
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principal_data[0].attributes = default_princ.attributes;
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principal_data[0].kdc_key_ver = (unsigned char) master_key_version;
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principal_data[0].key_version = 0; /* bumped up later */
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}
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tp = localtime(&principal_data[0].exp_date);
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(void) sprintf(principal_data[0].exp_date_txt, "%4d-%02d-%02d",
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tp->tm_year > 1900 ? tp->tm_year : tp->tm_year + 1900,
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tp->tm_mon + 1, tp->tm_mday); /* January is 0, not 1 */
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for (i = 0; i < j; i++) {
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for (;;) {
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fprintf(stdout,
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"\nPrincipal: %s, Instance: %s, kdc_key_ver: %d",
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principal_data[i].name, principal_data[i].instance,
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principal_data[i].kdc_key_ver);
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editpw = 1;
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changed = 0;
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if (!creating) {
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/*
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* copy the existing data so we can use the old values
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* for the qualifier clause of the replace
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*/
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principal_data[i].old = (char *) &old_principal;
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bcopy(&principal_data[i], &old_principal,
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sizeof(old_principal));
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printf("\nChange password [n] ? ");
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s_gets(temp, sizeof(temp)-1);
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if (strcmp("y", temp) && strcmp("Y", temp))
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editpw = 0;
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}
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/* password */
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if (editpw) {
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#ifdef NOENCRYPTION
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placebo_read_pw_string(pw_str, sizeof pw_str,
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"\nNew Password: ", TRUE);
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#else
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des_read_pw_string(pw_str, sizeof pw_str,
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"\nNew Password: ", TRUE);
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#endif
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if (pw_str[0] == '\0' || !strcmp(pw_str, "RANDOM")) {
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printf("\nRandom password [y] ? ");
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s_gets(temp, sizeof(temp)-1);
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if (!strcmp("n", temp) || !strcmp("N", temp)) {
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/* no, use literal */
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#ifdef NOENCRYPTION
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bzero(new_key, sizeof(C_Block));
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new_key[0] = 127;
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#else
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string_to_key(pw_str, &new_key);
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#endif
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bzero(pw_str, sizeof pw_str); /* "RANDOM" */
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} else {
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#ifdef NOENCRYPTION
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bzero(new_key, sizeof(C_Block));
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new_key[0] = 127;
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#else
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des_new_random_key(new_key); /* yes, random */
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#endif
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bzero(pw_str, sizeof pw_str);
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}
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} else if (!strcmp(pw_str, "NULL")) {
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printf("\nNull Key [y] ? ");
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s_gets(temp, sizeof(temp)-1);
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if (!strcmp("n", temp) || !strcmp("N", temp)) {
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/* no, use literal */
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#ifdef NOENCRYPTION
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bzero(new_key, sizeof(C_Block));
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new_key[0] = 127;
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#else
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string_to_key(pw_str, &new_key);
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#endif
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bzero(pw_str, sizeof pw_str); /* "NULL" */
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} else {
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principal_data[i].key_low = 0;
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principal_data[i].key_high = 0;
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goto null_key;
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}
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} else {
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#ifdef NOENCRYPTION
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bzero(new_key, sizeof(C_Block));
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new_key[0] = 127;
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#else
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string_to_key(pw_str, &new_key);
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#endif
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bzero(pw_str, sizeof pw_str);
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}
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/* seal it under the kerberos master key */
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kdb_encrypt_key (new_key, new_key,
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master_key, master_key_schedule,
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ENCRYPT);
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bcopy(new_key, &principal_data[i].key_low, 4);
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bcopy(((long *) new_key) + 1,
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&principal_data[i].key_high, 4);
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bzero(new_key, sizeof(new_key));
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null_key:
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/* set master key version */
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principal_data[i].kdc_key_ver =
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(unsigned char) master_key_version;
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/* bump key version # */
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principal_data[i].key_version++;
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fprintf(stdout,
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"\nPrincipal's new key version = %d\n",
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principal_data[i].key_version);
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fflush(stdout);
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changed = 1;
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}
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/* expiration date */
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fprintf(stdout, "Expiration date (enter yyyy-mm-dd) [ %s ] ? ",
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principal_data[i].exp_date_txt);
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zaptime(&edate);
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while (s_gets(temp, sizeof(temp)-1) && ((n = strlen(temp)) >
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sizeof(principal_data[0].exp_date_txt))) {
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bad_date:
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fprintf(stdout, "\07\07Date Invalid\n");
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fprintf(stdout,
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"Expiration date (enter yyyy-mm-dd) [ %s ] ? ",
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principal_data[i].exp_date_txt);
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zaptime(&edate);
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}
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if (*temp) {
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if (sscanf(temp, "%d-%d-%d", &edate.tm_year,
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&edate.tm_mon, &edate.tm_mday) != 3)
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goto bad_date;
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(void) strcpy(principal_data[i].exp_date_txt, temp);
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edate.tm_mon--; /* January is 0, not 1 */
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edate.tm_hour = 23; /* nearly midnight at the end of the */
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edate.tm_min = 59; /* specified day */
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if (!(principal_data[i].exp_date = maketime(&edate, 1)))
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goto bad_date;
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changed = 1;
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}
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/* maximum lifetime */
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fprintf(stdout, "Max ticket lifetime (*5 minutes) [ %d ] ? ",
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principal_data[i].max_life);
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while (s_gets(temp, sizeof(temp)-1) && *temp) {
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if (sscanf(temp, "%ld", &temp_long) != 1)
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goto bad_life;
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if (temp_long > 255 || (temp_long < 0)) {
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bad_life:
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fprintf(stdout, "\07\07Invalid, choose 0-255\n");
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fprintf(stdout,
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"Max ticket lifetime (*5 minutes) [ %d ] ? ",
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principal_data[i].max_life);
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continue;
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}
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changed = 1;
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/* dont clobber */
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principal_data[i].max_life = (unsigned short) temp_long;
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break;
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}
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/* attributes */
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fprintf(stdout, "Attributes [ %d ] ? ",
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principal_data[i].attributes);
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while (s_gets(temp, sizeof(temp)-1) && *temp) {
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if (sscanf(temp, "%ld", &temp_long) != 1)
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goto bad_att;
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if (temp_long > 65535 || (temp_long < 0)) {
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bad_att:
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fprintf(stdout, "\07\07Invalid, choose 0-65535\n");
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fprintf(stdout, "Attributes [ %d ] ? ",
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principal_data[i].attributes);
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continue;
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}
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changed = 1;
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/* dont clobber */
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principal_data[i].attributes =
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(unsigned short) temp_long;
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break;
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}
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/*
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* remaining fields -- key versions and mod info, should
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* not be directly manipulated
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*/
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if (changed) {
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if (kerb_put_principal(&principal_data[i], 1)) {
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fprintf(stdout,
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"\nError updating Kerberos database");
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} else {
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fprintf(stdout, "Edit O.K.");
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}
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} else {
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fprintf(stdout, "Unchanged");
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}
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bzero(&principal_data[i].key_low, 4);
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bzero(&principal_data[i].key_high, 4);
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fflush(stdout);
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break;
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}
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}
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if (more) {
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fprintf(stdout, "\nThere were more tuples found ");
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fprintf(stdout, "than there were space for");
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}
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return 1;
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}
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void
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no_core_dumps()
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{
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signal(SIGQUIT, (sig_t)sig_exit);
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signal(SIGILL, (sig_t)sig_exit);
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signal(SIGTRAP, (sig_t)sig_exit);
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signal(SIGIOT, (sig_t)sig_exit);
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signal(SIGEMT, (sig_t)sig_exit);
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signal(SIGFPE, (sig_t)sig_exit);
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signal(SIGBUS, (sig_t)sig_exit);
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signal(SIGSEGV, (sig_t)sig_exit);
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signal(SIGSYS, (sig_t)sig_exit);
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}
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void
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sig_exit(sig, code, scp)
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int sig, code;
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struct sigcontext *scp;
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{
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cleanup();
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fprintf(stderr,
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"\nSignal caught, sig = %d code = %d old pc = 0x%X \nexiting",
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sig, code, scp->sc_pc);
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exit(-1);
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}
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void
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cleanup()
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{
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bzero(master_key, sizeof(master_key));
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bzero(session_key, sizeof(session_key));
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bzero(master_key_schedule, sizeof(master_key_schedule));
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bzero(principal_data, sizeof(principal_data));
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bzero(new_key, sizeof(new_key));
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bzero(pw_str, sizeof(pw_str));
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}
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void
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Usage()
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{
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fprintf(stderr, "Usage: %s [-n]\n", progname);
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exit(1);
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}
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