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-rw-r--r--crypto/heimdal/lib/krb5/fcache.c525
1 files changed, 525 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/krb5/fcache.c b/crypto/heimdal/lib/krb5/fcache.c
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+++ b/crypto/heimdal/lib/krb5/fcache.c
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+/*
+ * Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "krb5_locl.h"
+
+RCSID("$Id: fcache.c,v 1.34 2002/04/18 14:01:29 joda Exp $");
+
+typedef struct krb5_fcache{
+ char *filename;
+ int version;
+}krb5_fcache;
+
+struct fcc_cursor {
+ int fd;
+ krb5_storage *sp;
+};
+
+#define KRB5_FCC_FVNO_1 1
+#define KRB5_FCC_FVNO_2 2
+#define KRB5_FCC_FVNO_3 3
+#define KRB5_FCC_FVNO_4 4
+
+#define FCC_TAG_DELTATIME 1
+
+#define FCACHE(X) ((krb5_fcache*)(X)->data.data)
+
+#define FILENAME(X) (FCACHE(X)->filename)
+
+#define FCC_CURSOR(C) ((struct fcc_cursor*)(C))
+
+static const char*
+fcc_get_name(krb5_context context,
+ krb5_ccache id)
+{
+ return FILENAME(id);
+}
+
+static krb5_error_code
+fcc_resolve(krb5_context context, krb5_ccache *id, const char *res)
+{
+ krb5_fcache *f;
+ f = malloc(sizeof(*f));
+ if(f == NULL) {
+ krb5_set_error_string(context, "malloc: out of memory");
+ return KRB5_CC_NOMEM;
+ }
+ f->filename = strdup(res);
+ if(f->filename == NULL){
+ free(f);
+ krb5_set_error_string(context, "malloc: out of memory");
+ return KRB5_CC_NOMEM;
+ }
+ f->version = 0;
+ (*id)->data.data = f;
+ (*id)->data.length = sizeof(*f);
+ return 0;
+}
+
+/*
+ * Try to scrub the contents of `filename' safely.
+ */
+
+static int
+scrub_file (int fd)
+{
+ off_t pos;
+ char buf[128];
+
+ pos = lseek(fd, 0, SEEK_END);
+ if (pos < 0)
+ return errno;
+ if (lseek(fd, 0, SEEK_SET) < 0)
+ return errno;
+ memset(buf, 0, sizeof(buf));
+ while(pos > 0) {
+ ssize_t tmp = write(fd, buf, min(sizeof(buf), pos));
+
+ if (tmp < 0)
+ return errno;
+ pos -= tmp;
+ }
+ fsync (fd);
+ return 0;
+}
+
+/*
+ * Erase `filename' if it exists, trying to remove the contents if
+ * it's `safe'. We always try to remove the file, it it exists. It's
+ * only overwritten if it's a regular file (not a symlink and not a
+ * hardlink)
+ */
+
+static krb5_error_code
+erase_file(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;
+ }
+ if (unlink(filename) < 0) {
+ close (fd);
+ return errno;
+ }
+
+ ret = fstat (fd, &sb2);
+ if (ret < 0) {
+ close (fd);
+ return errno;
+ }
+
+ /* check if someone was playing with symlinks */
+
+ if (sb1.st_dev != sb2.st_dev || sb1.st_ino != sb2.st_ino) {
+ close (fd);
+ return EPERM;
+ }
+
+ /* there are still hard links to this file */
+
+ if (sb2.st_nlink != 0) {
+ close (fd);
+ return 0;
+ }
+
+ ret = scrub_file (fd);
+ close (fd);
+ return ret;
+}
+
+static krb5_error_code
+fcc_gen_new(krb5_context context, krb5_ccache *id)
+{
+ krb5_fcache *f;
+ int fd;
+ char *file;
+
+ f = malloc(sizeof(*f));
+ if(f == NULL) {
+ krb5_set_error_string(context, "malloc: out of memory");
+ return KRB5_CC_NOMEM;
+ }
+ asprintf (&file, "%sXXXXXX", KRB5_DEFAULT_CCFILE_ROOT);
+ if(file == NULL) {
+ free(f);
+ krb5_set_error_string(context, "malloc: out of memory");
+ return KRB5_CC_NOMEM;
+ }
+ fd = mkstemp(file);
+ if(fd < 0) {
+ free(f);
+ free(file);
+ krb5_set_error_string(context, "mkstemp %s", file);
+ return errno;
+ }
+ close(fd);
+ f->filename = file;
+ f->version = 0;
+ (*id)->data.data = f;
+ (*id)->data.length = sizeof(*f);
+ return 0;
+}
+
+static void
+storage_set_flags(krb5_context context, krb5_storage *sp, int vno)
+{
+ int flags = 0;
+ switch(vno) {
+ case KRB5_FCC_FVNO_1:
+ flags |= KRB5_STORAGE_PRINCIPAL_WRONG_NUM_COMPONENTS;
+ flags |= KRB5_STORAGE_PRINCIPAL_NO_NAME_TYPE;
+ flags |= KRB5_STORAGE_HOST_BYTEORDER;
+ break;
+ case KRB5_FCC_FVNO_2:
+ flags |= KRB5_STORAGE_HOST_BYTEORDER;
+ break;
+ case KRB5_FCC_FVNO_3:
+ flags |= KRB5_STORAGE_KEYBLOCK_KEYTYPE_TWICE;
+ break;
+ case KRB5_FCC_FVNO_4:
+ break;
+ default:
+ krb5_abortx(context,
+ "storage_set_flags called with bad vno (%x)", vno);
+ }
+ krb5_storage_set_flags(sp, flags);
+}
+
+static krb5_error_code
+fcc_initialize(krb5_context context,
+ krb5_ccache id,
+ krb5_principal primary_principal)
+{
+ krb5_fcache *f = FCACHE(id);
+ int ret = 0;
+ int fd;
+ char *filename = f->filename;
+
+ unlink (filename);
+
+ fd = open(filename, O_RDWR | O_CREAT | O_EXCL | O_BINARY, 0600);
+ if(fd == -1) {
+ ret = errno;
+ krb5_set_error_string(context, "open(%s): %s", filename,
+ strerror(ret));
+ return ret;
+ }
+ {
+ krb5_storage *sp;
+ sp = krb5_storage_from_fd(fd);
+ krb5_storage_set_eof_code(sp, KRB5_CC_END);
+ if(context->fcache_vno != 0)
+ f->version = context->fcache_vno;
+ else
+ f->version = KRB5_FCC_FVNO_4;
+ ret |= krb5_store_int8(sp, 5);
+ ret |= krb5_store_int8(sp, f->version);
+ storage_set_flags(context, sp, f->version);
+ if(f->version == KRB5_FCC_FVNO_4 && ret == 0) {
+ /* V4 stuff */
+ if (context->kdc_sec_offset) {
+ ret |= krb5_store_int16 (sp, 12); /* length */
+ ret |= krb5_store_int16 (sp, FCC_TAG_DELTATIME); /* Tag */
+ ret |= krb5_store_int16 (sp, 8); /* length of data */
+ ret |= krb5_store_int32 (sp, context->kdc_sec_offset);
+ ret |= krb5_store_int32 (sp, context->kdc_usec_offset);
+ } else {
+ ret |= krb5_store_int16 (sp, 0);
+ }
+ }
+ ret |= krb5_store_principal(sp, primary_principal);
+ krb5_storage_free(sp);
+ }
+ if(close(fd) < 0)
+ if (ret == 0) {
+ ret = errno;
+ krb5_set_error_string (context, "close %s: %s", filename,
+ strerror(ret));
+ }
+
+ return ret;
+}
+
+static krb5_error_code
+fcc_close(krb5_context context,
+ krb5_ccache id)
+{
+ free (FILENAME(id));
+ krb5_data_free(&id->data);
+ return 0;
+}
+
+static krb5_error_code
+fcc_destroy(krb5_context context,
+ krb5_ccache id)
+{
+ char *f;
+ f = FILENAME(id);
+
+ erase_file(f);
+
+ return 0;
+}
+
+static krb5_error_code
+fcc_store_cred(krb5_context context,
+ krb5_ccache id,
+ krb5_creds *creds)
+{
+ int ret;
+ int fd;
+ char *f;
+
+ f = FILENAME(id);
+
+ fd = open(f, O_WRONLY | O_APPEND | O_BINARY);
+ if(fd < 0) {
+ ret = errno;
+ krb5_set_error_string (context, "open(%s): %s", f, strerror(ret));
+ return ret;
+ }
+ {
+ krb5_storage *sp;
+ sp = krb5_storage_from_fd(fd);
+ krb5_storage_set_eof_code(sp, KRB5_CC_END);
+ storage_set_flags(context, sp, FCACHE(id)->version);
+ ret = krb5_store_creds(sp, creds);
+ krb5_storage_free(sp);
+ }
+ if (close(fd) < 0)
+ if (ret == 0) {
+ ret = errno;
+ krb5_set_error_string (context, "close %s: %s", f, strerror(ret));
+ }
+ return ret;
+}
+
+static krb5_error_code
+fcc_read_cred (krb5_context context,
+ krb5_fcache *fc,
+ krb5_storage *sp,
+ krb5_creds *creds)
+{
+ krb5_error_code ret;
+
+ storage_set_flags(context, sp, fc->version);
+
+ ret = krb5_ret_creds(sp, creds);
+ return ret;
+}
+
+static krb5_error_code
+init_fcc (krb5_context context,
+ krb5_fcache *fcache,
+ krb5_storage **ret_sp,
+ int *ret_fd)
+{
+ int fd;
+ int8_t pvno, tag;
+ krb5_storage *sp;
+ krb5_error_code ret;
+
+ fd = open(fcache->filename, O_RDONLY | O_BINARY);
+ if(fd < 0) {
+ ret = errno;
+ krb5_set_error_string(context, "open(%s): %s", fcache->filename,
+ strerror(ret));
+ return ret;
+ }
+ sp = krb5_storage_from_fd(fd);
+ krb5_storage_set_eof_code(sp, KRB5_CC_END);
+ ret = krb5_ret_int8(sp, &pvno);
+ if(ret == KRB5_CC_END)
+ return ENOENT;
+ if(ret)
+ return ret;
+ if(pvno != 5) {
+ krb5_storage_free(sp);
+ close(fd);
+ return KRB5_CCACHE_BADVNO;
+ }
+ krb5_ret_int8(sp, &tag); /* should not be host byte order */
+ fcache->version = tag;
+ storage_set_flags(context, sp, fcache->version);
+ switch (tag) {
+ case KRB5_FCC_FVNO_4: {
+ int16_t length;
+
+ krb5_ret_int16 (sp, &length);
+ while(length > 0) {
+ int16_t tag, data_len;
+ int i;
+ int8_t dummy;
+
+ krb5_ret_int16 (sp, &tag);
+ krb5_ret_int16 (sp, &data_len);
+ switch (tag) {
+ case FCC_TAG_DELTATIME :
+ krb5_ret_int32 (sp, &context->kdc_sec_offset);
+ krb5_ret_int32 (sp, &context->kdc_usec_offset);
+ break;
+ default :
+ for (i = 0; i < data_len; ++i)
+ krb5_ret_int8 (sp, &dummy);
+ break;
+ }
+ length -= 4 + data_len;
+ }
+ break;
+ }
+ case KRB5_FCC_FVNO_3:
+ case KRB5_FCC_FVNO_2:
+ case KRB5_FCC_FVNO_1:
+ break;
+ default :
+ krb5_storage_free (sp);
+ close (fd);
+ return KRB5_CCACHE_BADVNO;
+ }
+ *ret_sp = sp;
+ *ret_fd = fd;
+ return 0;
+}
+
+static krb5_error_code
+fcc_get_principal(krb5_context context,
+ krb5_ccache id,
+ krb5_principal *principal)
+{
+ krb5_error_code ret;
+ krb5_fcache *f = FCACHE(id);
+ int fd;
+ krb5_storage *sp;
+
+ ret = init_fcc (context, f, &sp, &fd);
+ if (ret)
+ return ret;
+ ret = krb5_ret_principal(sp, principal);
+ krb5_storage_free(sp);
+ close(fd);
+ return ret;
+}
+
+static krb5_error_code
+fcc_get_first (krb5_context context,
+ krb5_ccache id,
+ krb5_cc_cursor *cursor)
+{
+ krb5_error_code ret;
+ krb5_principal principal;
+ krb5_fcache *f = FCACHE(id);
+
+ *cursor = malloc(sizeof(struct fcc_cursor));
+
+ ret = init_fcc (context, f, &FCC_CURSOR(*cursor)->sp,
+ &FCC_CURSOR(*cursor)->fd);
+ if (ret)
+ return ret;
+ krb5_ret_principal (FCC_CURSOR(*cursor)->sp, &principal);
+ krb5_free_principal (context, principal);
+ return 0;
+}
+
+static krb5_error_code
+fcc_get_next (krb5_context context,
+ krb5_ccache id,
+ krb5_cc_cursor *cursor,
+ krb5_creds *creds)
+{
+ return fcc_read_cred (context, FCACHE(id), FCC_CURSOR(*cursor)->sp, creds);
+}
+
+static krb5_error_code
+fcc_end_get (krb5_context context,
+ krb5_ccache id,
+ krb5_cc_cursor *cursor)
+{
+ krb5_storage_free(FCC_CURSOR(*cursor)->sp);
+ close (FCC_CURSOR(*cursor)->fd);
+ free(*cursor);
+ return 0;
+}
+
+static krb5_error_code
+fcc_remove_cred(krb5_context context,
+ krb5_ccache id,
+ krb5_flags which,
+ krb5_creds *cred)
+{
+ return 0; /* XXX */
+}
+
+static krb5_error_code
+fcc_set_flags(krb5_context context,
+ krb5_ccache id,
+ krb5_flags flags)
+{
+ return 0; /* XXX */
+}
+
+static krb5_error_code
+fcc_get_version(krb5_context context,
+ krb5_ccache id)
+{
+ return FCACHE(id)->version;
+}
+
+const krb5_cc_ops krb5_fcc_ops = {
+ "FILE",
+ fcc_get_name,
+ fcc_resolve,
+ fcc_gen_new,
+ fcc_initialize,
+ fcc_destroy,
+ fcc_close,
+ fcc_store_cred,
+ NULL, /* fcc_retrieve */
+ fcc_get_principal,
+ fcc_get_first,
+ fcc_get_next,
+ fcc_end_get,
+ fcc_remove_cred,
+ fcc_set_flags,
+ fcc_get_version
+};
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