static krb5_error_code
fkt_start_seq_get_int(krb5_context context,
krb5_keytab id,
int flags,
int exclusive,
krb5_kt_cursor *c)
{
int8_t pvno, tag;
krb5_error_code ret;
struct fkt_data *d = id->data;
c->fd = open (d->filename, flags);
if (c->fd < 0) {
ret = errno;
krb5_set_error_message(context, ret,
N_("keytab %s open failed: %s", ""),
d->filename, strerror(ret));
return ret;
}
rk_cloexec(c->fd);
ret = _krb5_xlock(context, c->fd, exclusive, d->filename);
if (ret) {
close(c->fd);
return ret;
}
c->sp = krb5_storage_from_fd(c->fd);
if (c->sp == NULL) {
_krb5_xunlock(context, c->fd);
close(c->fd);
return krb5_enomem(context);
}
krb5_storage_set_eof_code(c->sp, KRB5_KT_END);
ret = krb5_ret_int8(c->sp, &pvno);
if(ret) {
krb5_storage_free(c->sp);
_krb5_xunlock(context, c->fd);
close(c->fd);
krb5_clear_error_message(context);
return ret;
}
if(pvno != 5) {
krb5_storage_free(c->sp);
_krb5_xunlock(context, c->fd);
close(c->fd);
krb5_clear_error_message (context);
return KRB5_KEYTAB_BADVNO;
}
ret = krb5_ret_int8(c->sp, &tag);
if (ret) {
krb5_storage_free(c->sp);
_krb5_xunlock(context, c->fd);
close(c->fd);
krb5_clear_error_message(context);
return ret;
}
id->version = tag;
storage_set_flags(context, c->sp, id->version);
return 0;
}
static krb5_error_code KRB5_CALLCONV
fkt_end_seq_get(krb5_context context,
krb5_keytab id,
krb5_kt_cursor *cursor)
{
krb5_storage_free(cursor->sp);
_krb5_xunlock(context, cursor->fd);
close(cursor->fd);
return 0;
}
krb5_error_code
_krb5_erase_file(krb5_context context, const char *filename)
{
int fd;
struct stat sb1, sb2;
int ret;
ret = lstat (filename, &sb1);
if (ret < 0)
return errno;
fd = open(filename, O_RDWR | O_BINARY);
if(fd < 0) {
if(errno == ENOENT)
return 0;
else
return errno;
}
rk_cloexec(fd);
ret = _krb5_xlock(context, fd, 1, filename);
if (ret) {
close(fd);
return ret;
}
if (unlink(filename) < 0) {
_krb5_xunlock(context, fd);
close (fd);
return errno;
}
ret = fstat (fd, &sb2);
if (ret < 0) {
_krb5_xunlock(context, fd);
close (fd);
return errno;
}
/* check if someone was playing with symlinks */
if (sb1.st_dev != sb2.st_dev || sb1.st_ino != sb2.st_ino) {
_krb5_xunlock(context, fd);
close (fd);
return EPERM;
}
/* there are still hard links to this file */
if (sb2.st_nlink != 0) {
_krb5_xunlock(context, fd);
close (fd);
return 0;
}
ret = scrub_file (fd);
if (ret) {
_krb5_xunlock(context, fd);
close(fd);
return ret;
}
ret = _krb5_xunlock(context, fd);
close (fd);
return ret;
}
static krb5_error_code
fcc_unlock(krb5_context context, int fd)
{
return _krb5_xunlock(context, fd);
}
static krb5_error_code KRB5_CALLCONV
fkt_add_entry(krb5_context context,
krb5_keytab id,
krb5_keytab_entry *entry)
{
int ret;
int fd;
krb5_storage *sp;
struct fkt_data *d = id->data;
krb5_data keytab;
int32_t len;
fd = open (d->filename, O_RDWR | O_BINARY | O_CLOEXEC);
if (fd < 0) {
fd = open (d->filename, O_RDWR | O_CREAT | O_EXCL | O_BINARY | O_CLOEXEC, 0600);
if (fd < 0) {
ret = errno;
krb5_set_error_message(context, ret,
N_("open(%s): %s", ""), d->filename,
strerror(ret));
return ret;
}
rk_cloexec(fd);
ret = _krb5_xlock(context, fd, 1, d->filename);
if (ret) {
close(fd);
return ret;
}
sp = krb5_storage_from_fd(fd);
krb5_storage_set_eof_code(sp, KRB5_KT_END);
ret = fkt_setup_keytab(context, id, sp);
if(ret) {
goto out;
}
storage_set_flags(context, sp, id->version);
} else {
int8_t pvno, tag;
rk_cloexec(fd);
ret = _krb5_xlock(context, fd, 1, d->filename);
if (ret) {
close(fd);
return ret;
}
sp = krb5_storage_from_fd(fd);
krb5_storage_set_eof_code(sp, KRB5_KT_END);
ret = krb5_ret_int8(sp, &pvno);
if(ret) {
/* we probably have a zero byte file, so try to set it up
properly */
ret = fkt_setup_keytab(context, id, sp);
if(ret) {
krb5_set_error_message(context, ret,
N_("%s: keytab is corrupted: %s", ""),
d->filename, strerror(ret));
goto out;
}
storage_set_flags(context, sp, id->version);
} else {
if(pvno != 5) {
ret = KRB5_KEYTAB_BADVNO;
krb5_set_error_message(context, ret,
N_("Bad version in keytab %s", ""),
d->filename);
goto out;
}
ret = krb5_ret_int8 (sp, &tag);
if (ret) {
krb5_set_error_message(context, ret,
N_("failed reading tag from "
"keytab %s", ""),
d->filename);
goto out;
}
id->version = tag;
storage_set_flags(context, sp, id->version);
}
}
{
krb5_storage *emem;
emem = krb5_storage_emem();
if(emem == NULL) {
ret = krb5_enomem(context);
goto out;
}
ret = krb5_kt_store_principal(context, emem, entry->principal);
if(ret) {
krb5_set_error_message(context, ret,
N_("Failed storing principal "
"in keytab %s", ""),
d->filename);
krb5_storage_free(emem);
goto out;
}
ret = krb5_store_int32 (emem, entry->timestamp);
if(ret) {
krb5_set_error_message(context, ret,
N_("Failed storing timpstamp "
"in keytab %s", ""),
d->filename);
krb5_storage_free(emem);
goto out;
}
ret = krb5_store_int8 (emem, entry->vno % 256);
if(ret) {
krb5_set_error_message(context, ret,
N_("Failed storing kvno "
"in keytab %s", ""),
d->filename);
krb5_storage_free(emem);
goto out;
}
ret = krb5_kt_store_keyblock (context, d, emem, &entry->keyblock);
if(ret) {
krb5_storage_free(emem);
goto out;
}
if ((d->flags & KRB5_KT_FL_JAVA) == 0) {
ret = krb5_store_int32 (emem, entry->vno);
if (ret) {
krb5_set_error_message(context, ret,
N_("Failed storing extended kvno "
"in keytab %s", ""),
d->filename);
krb5_storage_free(emem);
goto out;
}
ret = krb5_store_uint32 (emem, entry->flags);
if (ret) {
krb5_set_error_message(context, ret,
N_("Failed storing extended kvno "
"in keytab %s", ""),
d->filename);
krb5_storage_free(emem);
goto out;
}
}
ret = krb5_storage_to_data(emem, &keytab);
krb5_storage_free(emem);
if(ret) {
krb5_set_error_message(context, ret,
N_("Failed converting keytab entry "
"to memory block for keytab %s", ""),
d->filename);
goto out;
}
}
while(1) {
ret = krb5_ret_int32(sp, &len);
if(ret == KRB5_KT_END) {
len = keytab.length;
break;
}
if(len < 0) {
len = -len;
if(len >= (int)keytab.length) {
krb5_storage_seek(sp, -4, SEEK_CUR);
break;
}
}
krb5_storage_seek(sp, len, SEEK_CUR);
}
ret = krb5_store_int32(sp, len);
if(krb5_storage_write(sp, keytab.data, keytab.length) < 0) {
ret = errno;
krb5_set_error_message(context, ret,
N_("Failed writing keytab block "
"in keytab %s: %s", ""),
d->filename, strerror(ret));
}
memset(keytab.data, 0, keytab.length);
krb5_data_free(&keytab);
out:
krb5_storage_free(sp);
_krb5_xunlock(context, fd);
close(fd);
return ret;
}
static krb5_error_code
fkt_add_entry(krb5_context context,
krb5_keytab id,
krb5_keytab_entry *entry)
{
int ret;
int fd;
krb5_storage *sp;
struct fkt_data *d = id->data;
krb5_data keytab;
int32_t len;
fd = open (d->filename, O_RDWR | O_BINARY);
if (fd < 0) {
fd = open (d->filename, O_RDWR | O_CREAT | O_EXCL | O_BINARY, 0600);
if (fd < 0) {
ret = errno;
krb5_set_error_string(context, "open(%s): %s", d->filename,
strerror(ret));
return ret;
}
ret = _krb5_xlock(context, fd, 1, d->filename);
if (ret) {
close(fd);
return ret;
}
sp = krb5_storage_from_fd(fd);
krb5_storage_set_eof_code(sp, KRB5_KT_END);
ret = fkt_setup_keytab(context, id, sp);
if(ret) {
goto out;
}
storage_set_flags(context, sp, id->version);
} else {
int8_t pvno, tag;
ret = _krb5_xlock(context, fd, 1, d->filename);
if (ret) {
close(fd);
return ret;
}
sp = krb5_storage_from_fd(fd);
krb5_storage_set_eof_code(sp, KRB5_KT_END);
ret = krb5_ret_int8(sp, &pvno);
if(ret) {
/* we probably have a zero byte file, so try to set it up
properly */
ret = fkt_setup_keytab(context, id, sp);
if(ret) {
krb5_set_error_string(context, "%s: keytab is corrupted: %s",
d->filename, strerror(ret));
goto out;
}
storage_set_flags(context, sp, id->version);
} else {
if(pvno != 5) {
ret = KRB5_KEYTAB_BADVNO;
krb5_set_error_string(context, "%s: %s",
d->filename, strerror(ret));
goto out;
}
ret = krb5_ret_int8 (sp, &tag);
if (ret) {
krb5_set_error_string(context, "%s: reading tag: %s",
d->filename, strerror(ret));
goto out;
}
id->version = tag;
storage_set_flags(context, sp, id->version);
}
}
{
krb5_storage *emem;
emem = krb5_storage_emem();
if(emem == NULL) {
ret = ENOMEM;
krb5_set_error_string (context, "malloc: out of memory");
goto out;
}
ret = krb5_kt_store_principal(context, emem, entry->principal);
if(ret) {
krb5_storage_free(emem);
goto out;
}
ret = krb5_store_int32 (emem, entry->timestamp);
if(ret) {
krb5_storage_free(emem);
goto out;
}
ret = krb5_store_int8 (emem, entry->vno % 256);
if(ret) {
krb5_storage_free(emem);
goto out;
}
ret = krb5_kt_store_keyblock (context, emem, &entry->keyblock);
if(ret) {
krb5_storage_free(emem);
goto out;
}
if ((d->flags & KRB5_KT_FL_JAVA) == 0) {
ret = krb5_store_int32 (emem, entry->vno);
if (ret) {
krb5_storage_free(emem);
goto out;
}
}
ret = krb5_storage_to_data(emem, &keytab);
krb5_storage_free(emem);
if(ret)
goto out;
}
while(1) {
ret = krb5_ret_int32(sp, &len);
if(ret == KRB5_KT_END) {
len = keytab.length;
break;
}
if(len < 0) {
len = -len;
if(len >= keytab.length) {
krb5_storage_seek(sp, -4, SEEK_CUR);
break;
}
}
krb5_storage_seek(sp, len, SEEK_CUR);
}
ret = krb5_store_int32(sp, len);
if(krb5_storage_write(sp, keytab.data, keytab.length) < 0)
ret = errno;
memset(keytab.data, 0, keytab.length);
krb5_data_free(&keytab);
out:
krb5_storage_free(sp);
_krb5_xunlock(context, fd);
close(fd);
return ret;
}
