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143 lines
3.6 KiB
C
143 lines
3.6 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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* from: kt.c,v 4.9 89/10/25 19:03:35 qjb Exp $
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* $Id: in_tkt.c,v 1.1.1.1 1994/09/30 14:50:01 csgr Exp $
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*/
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#ifndef lint
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static char rcsid[] =
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"$Id: in_tkt.c,v 1.1.1.1 1994/09/30 14:50:01 csgr Exp $";
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#endif /* lint */
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#include <unistd.h>
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#include <stdio.h>
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#include <krb.h>
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#include <sys/file.h>
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#include <sys/fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifdef TKT_SHMEM
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#include <sys/param.h>
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#endif
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extern int krb_debug;
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/*
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* in_tkt() is used to initialize the ticket store. It creates the
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* file to contain the tickets and writes the given user's name "pname"
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* and instance "pinst" in the file. in_tkt() returns KSUCCESS on
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* success, or KFAILURE if something goes wrong.
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*/
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in_tkt(pname,pinst)
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char *pname;
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char *pinst;
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{
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int tktfile;
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uid_t me, metoo;
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struct stat buf;
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int count;
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char *file = TKT_FILE;
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int fd;
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register int i;
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char charbuf[BUFSIZ];
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#ifdef TKT_SHMEM
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char shmidname[MAXPATHLEN];
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#endif /* TKT_SHMEM */
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me = getuid ();
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metoo = geteuid();
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if (lstat(file,&buf) == 0) {
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if (buf.st_uid != me && me == 0) {
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unlink(file);
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} else {
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if (buf.st_uid != me || !(buf.st_mode & S_IFREG) ||
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buf.st_mode & 077) {
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if (krb_debug)
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fprintf(stderr,"Error initializing %s",file);
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return(KFAILURE);
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}
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/* file already exists, and permissions appear ok, so nuke it */
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if ((fd = open(file, O_RDWR, 0)) < 0)
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goto out; /* can't zero it, but we can still try truncating it */
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bzero(charbuf, sizeof(charbuf));
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for (i = 0; i < buf.st_size; i += sizeof(charbuf))
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if (write(fd, charbuf, sizeof(charbuf)) != sizeof(charbuf)) {
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(void) fsync(fd);
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(void) close(fd);
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goto out;
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}
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(void) fsync(fd);
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(void) close(fd);
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}
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}
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out:
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/* arrange so the file is owned by the ruid
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(swap real & effective uid if necessary).
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This isn't a security problem, since the ticket file, if it already
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exists, has the right uid (== ruid) and mode. */
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if (me != metoo) {
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if (setreuid(metoo, me) < 0) {
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/* can't switch??? barf! */
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if (krb_debug)
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perror("in_tkt: setreuid");
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return(KFAILURE);
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} else
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if (krb_debug)
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printf("swapped UID's %d and %d\n",metoo,me);
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}
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if ((tktfile = open(file,O_CREAT | O_TRUNC | O_WRONLY,0600)) < 0) {
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if (krb_debug)
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fprintf(stderr,"Error initializing %s",TKT_FILE);
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return(KFAILURE);
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}
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if (me != metoo) {
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if (setreuid(me, metoo) < 0) {
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/* can't switch??? barf! */
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if (krb_debug)
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perror("in_tkt: setreuid2");
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return(KFAILURE);
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} else
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if (krb_debug)
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printf("swapped UID's %d and %d\n",me,metoo);
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}
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if (lstat(file,&buf) < 0) {
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if (krb_debug)
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fprintf(stderr,"Error initializing %s",TKT_FILE);
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return(KFAILURE);
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}
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if (buf.st_uid != me || !(buf.st_mode & S_IFREG) ||
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buf.st_mode & 077) {
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if (krb_debug)
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fprintf(stderr,"Error initializing %s",TKT_FILE);
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return(KFAILURE);
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}
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count = strlen(pname)+1;
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if (write(tktfile,pname,count) != count) {
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(void) close(tktfile);
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return(KFAILURE);
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}
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count = strlen(pinst)+1;
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if (write(tktfile,pinst,count) != count) {
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(void) close(tktfile);
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return(KFAILURE);
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}
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(void) close(tktfile);
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#ifdef TKT_SHMEM
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(void) strcpy(shmidname, file);
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(void) strcat(shmidname, ".shm");
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return(krb_shm_create(shmidname));
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#else /* !TKT_SHMEM */
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return(KSUCCESS);
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#endif /* TKT_SHMEM */
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}
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