581 lines
14 KiB
C
581 lines
14 KiB
C
/*
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* Copyright 1989 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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* list and update contents of srvtab files
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*/
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#ifndef lint
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#if 0
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static char rcsid_ksrvutil_c[] =
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"BonesHeader: /afs/athena.mit.edu/astaff/project/kerberos/src/kadmin/RCS/ksrvutil.c,v 4.1 89/09/26 09:33:49 jtkohl Exp ";
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#endif
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static const char rcsid[] =
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"$Id: ksrvutil.c,v 1.2 1995/01/23 22:54:08 wollman Exp $";
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#endif lint
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/*
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* ksrvutil
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* list and update the contents of srvtab files
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*/
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#ifndef FALSE
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#define FALSE 0
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#endif
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#ifndef TRUE
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#define TRUE 1
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#endif
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#include <sys/types.h>
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#include <sys/file.h>
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#include <sys/param.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <kadm.h>
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#include <err.h>
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#include <com_err.h>
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#ifdef NOENCRYPTION
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#define read_long_pw_string placebo_read_pw_string
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#else /* NOENCRYPTION */
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#define read_long_pw_string des_read_pw_string
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#endif /* NOENCRYPTION */
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int read_long_pw_string();
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#define SRVTAB_MODE 0600 /* rw------- */
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#define PAD " "
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#define VNO_HEADER "Version"
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#define VNO_FORMAT "%4d "
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#define KEY_HEADER " Key " /* 17 characters long */
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#define PRINC_HEADER " Principal\n"
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#define PRINC_FORMAT "%s"
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extern int errno;
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extern void krb_set_tkt_string();
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void leave();
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unsigned short get_mode();
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void
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copy_keyfile(progname, keyfile, backup_keyfile)
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char *progname;
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char *keyfile;
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char *backup_keyfile;
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{
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int keyfile_fd;
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int backup_keyfile_fd;
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int keyfile_mode;
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char buf[BUFSIZ]; /* for copying keyfiles */
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int rcount; /* for copying keyfiles */
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int try_again;
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(void) bzero((char *)buf, sizeof(buf));
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do {
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try_again = FALSE;
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if ((keyfile_fd = open(keyfile, O_RDONLY, 0)) < 0) {
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if (errno != ENOENT) {
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err(1, "unable to read %s", keyfile);
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}
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else {
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try_again = TRUE;
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if ((keyfile_fd =
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open(keyfile,
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O_WRONLY | O_TRUNC | O_CREAT, SRVTAB_MODE)) < 0) {
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err(1, "unable to create %s", keyfile);
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}
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else
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if (close(keyfile_fd) < 0) {
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err(1, "failure closing %s", keyfile);
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}
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}
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}
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} while(try_again);
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keyfile_mode = get_mode(keyfile);
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if ((backup_keyfile_fd =
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open(backup_keyfile, O_WRONLY | O_TRUNC | O_CREAT,
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keyfile_mode)) < 0) {
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err(1, "unable to write %s", backup_keyfile);
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}
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do {
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if ((rcount = read(keyfile_fd, (char *)buf, sizeof(buf))) < 0) {
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err(1, "error reading %s", keyfile);
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}
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if (rcount && (write(backup_keyfile_fd, buf, rcount) != rcount)) {
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err(1, "error writing %s", backup_keyfile);
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}
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} while (rcount);
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if (close(backup_keyfile_fd) < 0) {
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err(1, "error closing %s", backup_keyfile);
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}
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if (close(keyfile_fd) < 0) {
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err(1, "error closing %s", keyfile);
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}
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}
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void
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safe_read_stdin(prompt, buf, size)
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char *prompt;
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char *buf;
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int size;
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{
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(void) printf(prompt);
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(void) fflush(stdout);
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(void) bzero(buf, size);
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if (read(0, buf, size - 1) < 0) {
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warn("failure reading from stdin");
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leave((char *)NULL, 1);
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}
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fflush(stdin);
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buf[strlen(buf)-1] = 0;
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}
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void
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safe_write(progname, filename, fd, buf, len)
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char *progname;
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char *filename;
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int fd;
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char *buf;
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int len;
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{
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if (write(fd, buf, len) != len) {
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warn("failure writing %s", filename);
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close(fd);
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leave("In progress srvtab in this file.", 1);
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}
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}
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int
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yn(string)
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char *string;
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{
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char ynbuf[5];
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(void) printf("%s (y,n) [y] ", string);
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for (;;) {
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safe_read_stdin("", ynbuf, sizeof(ynbuf));
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if ((ynbuf[0] == 'n') || (ynbuf[0] == 'N'))
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return(0);
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else if ((ynbuf[0] == 'y') || (ynbuf[0] == 'Y') || (ynbuf[0] == 0))
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return(1);
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else {
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(void) printf("Please enter 'y' or 'n': ");
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fflush(stdout);
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}
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}
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}
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void
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append_srvtab(progname, filename, fd, sname, sinst,
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srealm, key_vno, key)
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char *progname;
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char *filename;
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int fd;
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char *sname;
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char *sinst;
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char *srealm;
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unsigned char key_vno;
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des_cblock key;
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{
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/* Add one to append null */
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safe_write(progname, filename, fd, sname, strlen(sname) + 1);
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safe_write(progname, filename, fd, sinst, strlen(sinst) + 1);
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safe_write(progname, filename, fd, srealm, strlen(srealm) + 1);
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safe_write(progname, filename, fd, (char *)&key_vno, 1);
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safe_write(progname, filename, fd, (char *)key, sizeof(des_cblock));
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(void) fsync(fd);
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}
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unsigned short
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get_mode(filename)
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char *filename;
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{
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struct stat statbuf;
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unsigned short mode;
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(void) bzero((char *)&statbuf, sizeof(statbuf));
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if (stat(filename, &statbuf) < 0)
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mode = SRVTAB_MODE;
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else
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mode = statbuf.st_mode;
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return(mode);
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}
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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 sname[ANAME_SZ]; /* name of service */
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char sinst[INST_SZ]; /* instance of service */
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char srealm[REALM_SZ]; /* realm of service */
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unsigned char key_vno; /* key version number */
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int status; /* general purpose error status */
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des_cblock new_key;
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des_cblock old_key;
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char change_tkt[MAXPATHLEN]; /* Ticket to use for key change */
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char keyfile[MAXPATHLEN]; /* Original keyfile */
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char work_keyfile[MAXPATHLEN]; /* Working copy of keyfile */
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char backup_keyfile[MAXPATHLEN]; /* Backup copy of keyfile */
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unsigned short keyfile_mode; /* Protections on keyfile */
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int work_keyfile_fd = -1; /* Initialize so that */
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int backup_keyfile_fd = -1; /* compiler doesn't complain */
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char local_realm[REALM_SZ]; /* local kerberos realm */
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int i;
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int interactive = FALSE;
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int list = FALSE;
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int change = FALSE;
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int add = FALSE;
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int key = FALSE; /* do we show keys? */
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int arg_entered = FALSE;
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int change_this_key = FALSE;
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char databuf[BUFSIZ];
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int first_printed = FALSE; /* have we printed the first item? */
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int get_svc_new_key();
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void get_key_from_password();
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void print_key();
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void print_name();
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(void) bzero((char *)sname, sizeof(sname));
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(void) bzero((char *)sinst, sizeof(sinst));
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(void) bzero((char *)srealm, sizeof(srealm));
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(void) bzero((char *)change_tkt, sizeof(change_tkt));
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(void) bzero((char *)keyfile, sizeof(keyfile));
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(void) bzero((char *)work_keyfile, sizeof(work_keyfile));
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(void) bzero((char *)backup_keyfile, sizeof(backup_keyfile));
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(void) bzero((char *)local_realm, sizeof(local_realm));
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(void) sprintf(change_tkt, "/tmp/tkt_ksrvutil.%d", getpid());
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krb_set_tkt_string(change_tkt);
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/* This is used only as a default for adding keys */
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if (krb_get_lrealm(local_realm, 1) != KSUCCESS)
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(void) strcpy(local_realm, KRB_REALM);
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for (i = 1; i < argc; i++) {
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if (strcmp(argv[i], "-i") == 0)
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interactive++;
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else if (strcmp(argv[i], "-k") == 0)
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key++;
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else if (strcmp(argv[i], "list") == 0) {
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if (arg_entered)
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usage();
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else {
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arg_entered++;
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list++;
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}
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}
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else if (strcmp(argv[i], "change") == 0) {
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if (arg_entered)
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usage();
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else {
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arg_entered++;
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change++;
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}
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}
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else if (strcmp(argv[i], "add") == 0) {
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if (arg_entered)
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usage();
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else {
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arg_entered++;
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add++;
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}
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}
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else if (strcmp(argv[i], "-f") == 0) {
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if (++i == argc)
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usage();
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else
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(void) strcpy(keyfile, argv[i]);
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}
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else
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usage();
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}
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if (!arg_entered)
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usage();
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if (!keyfile[0])
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(void) strcpy(keyfile, KEYFILE);
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(void) strcpy(work_keyfile, keyfile);
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(void) strcpy(backup_keyfile, keyfile);
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if (change || add) {
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(void) strcat(work_keyfile, ".work");
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(void) strcat(backup_keyfile, ".old");
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copy_keyfile(argv[0], keyfile, backup_keyfile);
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}
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if (add)
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copy_keyfile(argv[0], backup_keyfile, work_keyfile);
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keyfile_mode = get_mode(keyfile);
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if (change || list) {
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if ((backup_keyfile_fd = open(backup_keyfile, O_RDONLY, 0)) < 0) {
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err(1, "unable to read %s", backup_keyfile);
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}
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}
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if (change) {
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if ((work_keyfile_fd =
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open(work_keyfile, O_WRONLY | O_CREAT | O_TRUNC,
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SRVTAB_MODE)) < 0) {
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err(1, "unable to write %s", work_keyfile);
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}
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}
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else if (add) {
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if ((work_keyfile_fd =
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open(work_keyfile, O_APPEND | O_WRONLY, SRVTAB_MODE)) < 0) {
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err(1, "unable to append to %s", work_keyfile);
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}
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}
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if (change || list) {
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while ((getst(backup_keyfile_fd, sname, SNAME_SZ) > 0) &&
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(getst(backup_keyfile_fd, sinst, INST_SZ) > 0) &&
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(getst(backup_keyfile_fd, srealm, REALM_SZ) > 0) &&
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(read(backup_keyfile_fd, &key_vno, 1) > 0) &&
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(read(backup_keyfile_fd,(char *)old_key,sizeof(old_key)) > 0)) {
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if (list) {
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if (!first_printed) {
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(void) printf(VNO_HEADER);
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(void) printf(PAD);
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if (key) {
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(void) printf(KEY_HEADER);
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(void) printf(PAD);
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}
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(void) printf(PRINC_HEADER);
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first_printed = 1;
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}
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(void) printf(VNO_FORMAT, key_vno);
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(void) printf(PAD);
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if (key) {
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print_key(old_key);
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(void) printf(PAD);
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}
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print_name(sname, sinst, srealm);
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(void) printf("\n");
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}
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else if (change) {
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(void) printf("\nPrincipal: ");
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print_name(sname, sinst, srealm);
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(void) printf("; version %d\n", key_vno);
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if (interactive)
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change_this_key = yn("Change this key?");
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else if (change)
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change_this_key = 1;
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else
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change_this_key = 0;
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if (change_this_key)
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(void) printf("Changing to version %d.\n", key_vno + 1);
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else if (change)
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(void) printf("Not changing this key.\n");
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if (change_this_key) {
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/*
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* Pick a new key and determine whether or not
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* it is safe to change
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*/
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if ((status =
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get_svc_new_key(new_key, sname, sinst,
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srealm, keyfile)) == KADM_SUCCESS)
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key_vno++;
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else {
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(void) bcopy(old_key, new_key, sizeof(new_key));
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com_err(argv[0], status, ": key NOT changed");
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change_this_key = FALSE;
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}
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}
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else
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(void) bcopy(old_key, new_key, sizeof(new_key));
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append_srvtab(argv[0], work_keyfile, work_keyfile_fd,
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sname, sinst, srealm, key_vno, new_key);
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if (key && change_this_key) {
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(void) printf("Old key: ");
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print_key(old_key);
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(void) printf("; new key: ");
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print_key(new_key);
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(void) printf("\n");
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}
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if (change_this_key) {
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if ((status = kadm_change_pw(new_key)) == KADM_SUCCESS) {
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(void) printf("Key changed.\n");
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(void) dest_tkt();
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}
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else {
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com_err(argv[0], status,
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" attempting to change password.");
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(void) dest_tkt();
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/* XXX This knows the format of a keyfile */
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if (lseek(work_keyfile_fd, -9, L_INCR) >= 0) {
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key_vno--;
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safe_write(argv[0], work_keyfile,
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work_keyfile_fd, (char *)&key_vno, 1);
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safe_write(argv[0], work_keyfile, work_keyfile_fd,
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(char *)old_key, sizeof(des_cblock));
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(void) fsync(work_keyfile_fd);
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(void) fprintf(stderr,"Key NOT changed.\n");
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}
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else {
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warn("unable to revert keyfile");
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leave("", 1);
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}
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}
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}
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}
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bzero((char *)old_key, sizeof(des_cblock));
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bzero((char *)new_key, sizeof(des_cblock));
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}
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}
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else if (add) {
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do {
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do {
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safe_read_stdin("Name: ", databuf, sizeof(databuf));
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(void) strncpy(sname, databuf, sizeof(sname) - 1);
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safe_read_stdin("Instance: ", databuf, sizeof(databuf));
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(void) strncpy(sinst, databuf, sizeof(sinst) - 1);
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safe_read_stdin("Realm: ", databuf, sizeof(databuf));
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(void) strncpy(srealm, databuf, sizeof(srealm) - 1);
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safe_read_stdin("Version number: ", databuf, sizeof(databuf));
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key_vno = atoi(databuf);
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if (!srealm[0])
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(void) strcpy(srealm, local_realm);
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(void) printf("New principal: ");
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print_name(sname, sinst, srealm);
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(void) printf("; version %d\n", key_vno);
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} while (!yn("Is this correct?"));
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get_key_from_password(new_key);
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if (key) {
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(void) printf("Key: ");
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print_key(new_key);
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(void) printf("\n");
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}
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append_srvtab(argv[0], work_keyfile, work_keyfile_fd,
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sname, sinst, srealm, key_vno, new_key);
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(void) printf("Key successfully added.\n");
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} while (yn("Would you like to add another key?"));
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}
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if (change || list)
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if (close(backup_keyfile_fd) < 0) {
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warn("failure closing %s, continuing", backup_keyfile);
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}
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if (change || add) {
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if (close(work_keyfile_fd) < 0) {
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err(1, "failure closing %s", work_keyfile);
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}
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if (rename(work_keyfile, keyfile) < 0) {
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err(1, "failure renaming %s to %s", work_keyfile, keyfile);
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}
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(void) chmod(backup_keyfile, keyfile_mode);
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(void) chmod(keyfile, keyfile_mode);
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(void) printf("Old keyfile in %s.\n", backup_keyfile);
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}
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|
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exit(0);
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}
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|
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void
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print_key(key)
|
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des_cblock key;
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{
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int i;
|
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|
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for (i = 0; i < 4; i++)
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(void) printf("%02x", key[i]);
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(void) printf(" ");
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for (i = 4; i < 8; i++)
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(void) printf("%02x", key[i]);
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}
|
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|
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void
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print_name(name, inst, realm)
|
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char *name;
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char *inst;
|
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char *realm;
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{
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|
(void) printf("%s%s%s%s%s", name, inst[0] ? "." : "", inst,
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realm[0] ? "@" : "", realm);
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|
}
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|
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int
|
|
get_svc_new_key(new_key, sname, sinst, srealm, keyfile)
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|
des_cblock new_key;
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|
char *sname;
|
|
char *sinst;
|
|
char *srealm;
|
|
char *keyfile;
|
|
{
|
|
int status = KADM_SUCCESS;
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|
|
|
if (((status = krb_get_svc_in_tkt(sname, sinst, srealm, PWSERV_NAME,
|
|
KADM_SINST, 1, keyfile)) == KSUCCESS) &&
|
|
((status = kadm_init_link("changepw", KRB_MASTER, srealm)) ==
|
|
KADM_SUCCESS)) {
|
|
#ifdef NOENCRYPTION
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|
(void) bzero((char *) new_key, sizeof(des_cblock));
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|
new_key[0] = (unsigned char) 1;
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|
#else /* NOENCRYPTION */
|
|
(void) des_random_key(new_key);
|
|
#endif /* NOENCRYPTION */
|
|
return(KADM_SUCCESS);
|
|
}
|
|
|
|
return(status);
|
|
}
|
|
|
|
void
|
|
get_key_from_password(key)
|
|
des_cblock key;
|
|
{
|
|
char password[MAX_KPW_LEN]; /* storage for the password */
|
|
|
|
if (read_long_pw_string(password, sizeof(password)-1, "Password: ", 1))
|
|
leave("Error reading password.", 1);
|
|
|
|
#ifdef NOENCRYPTION
|
|
(void) bzero((char *) key, sizeof(des_cblock));
|
|
key[0] = (unsigned char) 1;
|
|
#else /* NOENCRYPTION */
|
|
(void) des_string_to_key(password, key);
|
|
#endif /* NOENCRYPTION */
|
|
(void) bzero((char *)password, sizeof(password));
|
|
}
|
|
|
|
usage()
|
|
{
|
|
(void) fprintf(stderr, "Usage: ksrvutil [-f keyfile] [-i] [-k] ");
|
|
(void) fprintf(stderr, "{list | change | add}\n");
|
|
(void) fprintf(stderr, " -i causes the program to ask for ");
|
|
(void) fprintf(stderr, "confirmation before changing keys.\n");
|
|
(void) fprintf(stderr, " -k causes the key to printed for list or ");
|
|
(void) fprintf(stderr, "change.\n");
|
|
exit(1);
|
|
}
|
|
|
|
void
|
|
leave(str,x)
|
|
char *str;
|
|
int x;
|
|
{
|
|
if (str)
|
|
(void) fprintf(stderr, "%s\n", str);
|
|
(void) dest_tkt();
|
|
exit(x);
|
|
}
|