/*
* Determine if requester is allowed to update the given map,
* and update it if so. Returns the yp status, which is zero
* if there is no access violation.
*/
int
mapupdate(char *requester, char *mapname, u_int op, u_int keylen, char *key,
u_int datalen, char *data)
{
char updater[MAXMAPNAMELEN + 40];
FILE *childargs;
FILE *childrslt;
#ifdef WEXITSTATUS
int status;
#else
union wait status;
#endif
pid_t pid;
u_int yperrno;
#ifdef DEBUG
printf("%s %s\n", key, data);
#endif
(void)sprintf(updater, "make -s -f %s/%s %s", YPDBPATH, /* !!! */
UPDATEFILE, mapname);
pid = _openchild(updater, &childargs, &childrslt);
if (pid < 0) {
return (YPERR_YPERR);
}
/*
* Write to child
*/
(void)fprintf(childargs, "%s\n", requester);
(void)fprintf(childargs, "%u\n", op);
(void)fprintf(childargs, "%u\n", keylen);
(void)fwrite(key, (int)keylen, 1, childargs);
(void)fprintf(childargs, "\n");
(void)fprintf(childargs, "%u\n", datalen);
(void)fwrite(data, (int)datalen, 1, childargs);
(void)fprintf(childargs, "\n");
(void)fclose(childargs);
/*
* Read from child
*/
(void)fscanf(childrslt, "%d", &yperrno);
(void)fclose(childrslt);
(void)wait(&status);
#ifdef WEXITSTATUS
if (WEXITSTATUS(status) != 0)
#else
if (status.w_retcode != 0)
#endif
return (YPERR_YPERR);
return (yperrno);
}
/*
* Determine if requester is allowed to update the given map,
* and update it if so. Returns the yp status, which is zero
* if there is no access violation.
*/
int
mapupdate(char *requester, char *mapname, u_int op, u_int keylen,
char *key, u_int datalen, char *data)
{
char updater[MAXMAPNAMELEN + 40];
FILE *childargs;
FILE *childrslt;
#ifdef WEXITSTATUS
int status;
#else
union wait status;
#endif
pid_t pid;
u_int yperrno;
#ifdef DEBUG
printf("%s %s\n", key, data);
#endif
(void)sprintf(updater, "make -s -f %s/%s %s", YPDBPATH, /* !!! */
UPDATEFILE, mapname);
pid = _openchild(updater, &childargs, &childrslt);
if (pid < 0) {
return (YPERR_YPERR);
}
/*
* Write to child
*/
(void)fprintf(childargs, "%s\n", requester);
(void)fprintf(childargs, "%u\n", op);
(void)fprintf(childargs, "%u\n", keylen);
(void)fwrite(key, (int)keylen, 1, childargs);
(void)fprintf(childargs, "\n");
(void)fprintf(childargs, "%u\n", datalen);
(void)fwrite(data, (int)datalen, 1, childargs);
(void)fprintf(childargs, "\n");
(void)fclose(childargs);
/*
* Read from child
*/
(void)fscanf(childrslt, "%d", &yperrno);
(void)fclose(childrslt);
(void)wait(&status);
#ifdef WEXITSTATUS
if (WEXITSTATUS(status) != 0) {
#else
if (status.w_retcode != 0) {
#endif
return (YPERR_YPERR);
}
return (yperrno);
}
/*
* returns pid, or -1 for failure
*/
static pid_t
_openchild(char *command, FILE **fto, FILE **ffrom)
{
int i;
pid_t pid;
int pdto[2];
int pdfrom[2];
char *com;
struct rlimit rl;
if (pipe(pdto) < 0) {
goto error1;
}
if (pipe(pdfrom) < 0) {
goto error2;
}
switch (pid = fork()) {
case -1:
goto error3;
case 0:
/*
* child: read from pdto[0], write into pdfrom[1]
*/
(void)close(0);
(void)dup(pdto[0]);
(void)close(1);
(void)dup(pdfrom[1]);
getrlimit(RLIMIT_NOFILE, &rl);
for (i = rl.rlim_max - 1; i >= 3; i--) {
(void) close(i);
}
com = malloc((unsigned) strlen(command) + 6);
if (com == NULL) {
_exit(~0);
}
(void)sprintf(com, "exec %s", command);
execl(SHELL, basename(SHELL), "-c", com, (char *)NULL);
_exit(~0);
default:
/*
* parent: write into pdto[1], read from pdfrom[0]
*/
*fto = fdopen(pdto[1], "w");
(void)close(pdto[0]);
*ffrom = fdopen(pdfrom[0], "r");
(void)close(pdfrom[1]);
break;
}
return (pid);
/*
* error cleanup and return
*/
error3:
(void)close(pdfrom[0]);
(void)close(pdfrom[1]);
error2:
(void)close(pdto[0]);
(void)close(pdto[1]);
error1:
return (-1);
}
static int
internal_function
key_call_keyenvoy (u_long proc, xdrproc_t xdr_arg, char *arg,
xdrproc_t xdr_rslt, char *rslt)
{
XDR xdrargs;
XDR xdrrslt;
FILE *fargs;
FILE *frslt;
sigset_t oldmask, mask;
union wait status;
int pid;
int success;
uid_t ruid;
uid_t euid;
static const char MESSENGER[] = "/usr/etc/keyenvoy";
success = 1;
sigemptyset (&mask);
sigaddset (&mask, SIGCHLD);
__sigprocmask (SIG_BLOCK, &mask, &oldmask);
/*
* We are going to exec a set-uid program which makes our effective uid
* zero, and authenticates us with our real uid. We need to make the
* effective uid be the real uid for the setuid program, and
* the real uid be the effective uid so that we can change things back.
*/
euid = __geteuid ();
ruid = __getuid ();
__setreuid (euid, ruid);
pid = _openchild (MESSENGER, &fargs, &frslt);
__setreuid (ruid, euid);
if (pid < 0)
{
debug ("open_streams");
__sigprocmask (SIG_SETMASK, &oldmask, NULL);
return (0);
}
xdrstdio_create (&xdrargs, fargs, XDR_ENCODE);
xdrstdio_create (&xdrrslt, frslt, XDR_DECODE);
if (!INTUSE(xdr_u_long) (&xdrargs, &proc) || !(*xdr_arg) (&xdrargs, arg))
{
debug ("xdr args");
success = 0;
}
fclose (fargs);
if (success && !(*xdr_rslt) (&xdrrslt, rslt))
{
debug ("xdr rslt");
success = 0;
}
fclose(frslt);
wait_again:
if (__wait4 (pid, &status, 0, NULL) < 0)
{
if (errno == EINTR)
goto wait_again;
debug ("wait4");
if (errno == ECHILD || errno == ESRCH)
perror ("wait");
else
success = 0;
}
else
if (status.w_retcode)
{
debug ("wait4 1");
success = 0;
}
__sigprocmask (SIG_SETMASK, &oldmask, NULL);
return success;
}
/*
* Determine if requester is allowed to update the given map,
* and update it if so. Returns the yp status, which is zero
* if there is no access violation.
*/
int
mapupdate(char *name, char *mapname, uint_t op, char *data)
{
char updater[MAXMAPNAMELEN + 40];
FILE *childargs;
FILE *childrslt;
#ifdef WEXITSTATUS
int status;
#else
union wait status;
#endif
pid_t pid;
uint_t yperrno;
int namelen, datalen;
struct stat stbuf;
#ifdef DEBUG
(void) fprintf(stderr, "%s %s\n", name, data);
#endif
namelen = strlen(name);
datalen = strlen(data);
errno = 0;
if (stat(MAKE, &stbuf) < 0)
switch (errno) {
case ENOENT:
(void) fprintf(stderr,
"%s: %s not found, please install on the system\n",
program_name, MAKE);
return (1);
default:
(void) fprintf(stderr,
"%s: cannot access %s, errno=%d.\n",
program_name, MAKE, errno);
return (1);
}
(void) sprintf(updater, "%s -s -f %s %s",
MAKE, UPDATEFILE, mapname);
pid = _openchild(updater, &childargs, &childrslt);
if (pid < 0)
return (YPERR_YPERR);
/*
* Write to child
*/
(void) fprintf(childargs, "%s\n", name);
(void) fprintf(childargs, "%u\n", op);
(void) fprintf(childargs, "%u\n", namelen);
(void) fwrite(name, namelen, 1, childargs);
(void) fprintf(childargs, "\n");
(void) fprintf(childargs, "%u\n", datalen);
(void) fwrite(data, datalen, 1, childargs);
(void) fprintf(childargs, "\n");
(void) fclose(childargs);
/*
* Read from child
*/
(void) fscanf(childrslt, "%d", &yperrno);
(void) fclose(childrslt);
(void) wait(&status);
#ifdef WEXITSTATUS
if (WEXITSTATUS(status) != 0) {
#else
if (status.w_retcode != 0) {
#endif
return (YPERR_YPERR);
}
return (yperrno);
}
/*
* returns pid, or -1 for failure
*/
static int
_openchild(char *command, FILE **fto, FILE **ffrom)
{
int i;
pid_t pid;
int pdto[2];
int pdfrom[2];
char *com;
if (pipe(pdto) < 0) {
goto error1;
}
if (pipe(pdfrom) < 0) {
goto error2;
}
#ifdef VFORK
switch (pid = vfork()) {
#else
switch (pid = fork()) {
#endif
case -1:
goto error3;
case 0:
/*
* child: read from pdto[0], write into pdfrom[1]
*/
(void) close(0);
(void) dup(pdto[0]);
(void) close(1);
(void) dup(pdfrom[1]);
closefrom(3);
com = malloc((unsigned)strlen(command) + 6);
if (com == NULL) {
_exit(~0);
}
(void) sprintf(com, "exec %s", command);
execl(SHELL, basename(SHELL), "-c", com, NULL);
_exit(~0);
default:
/*
* parent: write into pdto[1], read from pdfrom[0]
*/
*fto = fdopen(pdto[1], "w");
(void) close(pdto[0]);
*ffrom = fdopen(pdfrom[0], "r");
(void) close(pdfrom[1]);
break;
}
return (pid);
/*
* error cleanup and return
*/
error3:
(void) close(pdfrom[0]);
(void) close(pdfrom[1]);
error2:
(void) close(pdto[0]);
(void) close(pdto[1]);
error1:
return (-1);
}
static char *
basename(char *path)
{
char *p;
p = strrchr(path, '/');
if (p == NULL)
return (path);
return (p + 1);
}
