mirror of
https://github.com/samba-team/samba.git
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8876d79311
to allow for removing all entries with given principal and enctype without
repecting the kvno (i.e. cleaning "old" entries...)
This is called with ignore_kvno == false from libnet_keytab_add_entry() to
keep the original behaviour.
Michael
(This used to be commit 6047f7b685)
383 lines
8.7 KiB
C
383 lines
8.7 KiB
C
/*
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Unix SMB/CIFS implementation.
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dump the remote SAM using rpc samsync operations
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Copyright (C) Guenther Deschner 2008.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "libnet/libnet.h"
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#ifdef HAVE_KRB5
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/****************************************************************
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****************************************************************/
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static int keytab_close(struct libnet_keytab_context *ctx)
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{
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if (!ctx) {
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return 0;
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}
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if (ctx->keytab && ctx->context) {
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krb5_kt_close(ctx->context, ctx->keytab);
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}
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if (ctx->context) {
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krb5_free_context(ctx->context);
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}
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if (ctx->ads) {
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ads_destroy(&ctx->ads);
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}
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TALLOC_FREE(ctx);
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return 0;
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}
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/****************************************************************
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****************************************************************/
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krb5_error_code libnet_keytab_init(TALLOC_CTX *mem_ctx,
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const char *keytab_name,
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struct libnet_keytab_context **ctx)
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{
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krb5_error_code ret = 0;
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krb5_context context = NULL;
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krb5_keytab keytab = NULL;
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const char *keytab_string = NULL;
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struct libnet_keytab_context *r;
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r = TALLOC_ZERO_P(mem_ctx, struct libnet_keytab_context);
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if (!r) {
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return ENOMEM;
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}
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talloc_set_destructor(r, keytab_close);
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initialize_krb5_error_table();
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ret = krb5_init_context(&context);
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if (ret) {
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DEBUG(1,("keytab_init: could not krb5_init_context: %s\n",
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error_message(ret)));
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return ret;
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}
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ret = smb_krb5_open_keytab(context, keytab_name, true, &keytab);
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if (ret) {
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DEBUG(1,("keytab_init: smb_krb5_open_keytab failed (%s)\n",
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error_message(ret)));
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krb5_free_context(context);
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return ret;
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}
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ret = smb_krb5_keytab_name(mem_ctx, context, keytab, &keytab_string);
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if (ret) {
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krb5_kt_close(context, keytab);
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krb5_free_context(context);
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return ret;
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}
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r->context = context;
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r->keytab = keytab;
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r->keytab_name = keytab_string;
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r->clean_old_entries = false;
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*ctx = r;
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return 0;
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}
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/****************************************************************
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****************************************************************/
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/**
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* Remove all entries that have the given principal, kvno and enctype.
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*/
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static krb5_error_code libnet_keytab_remove_entries(krb5_context context,
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krb5_keytab keytab,
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const char *principal,
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int kvno,
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const krb5_enctype enctype,
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bool ignore_kvno)
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{
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krb5_error_code ret;
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krb5_kt_cursor cursor;
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krb5_keytab_entry kt_entry;
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ZERO_STRUCT(kt_entry);
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ZERO_STRUCT(cursor);
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ret = krb5_kt_start_seq_get(context, keytab, &cursor);
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if (ret) {
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return 0;
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}
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while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0)
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{
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char *princ_s = NULL;
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if (kt_entry.vno != kvno && !ignore_kvno) {
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goto cont;
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}
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if (kt_entry.key.enctype != enctype) {
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goto cont;
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}
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ret = smb_krb5_unparse_name(context, kt_entry.principal,
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&princ_s);
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if (ret) {
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DEBUG(5, ("smb_krb5_unparse_name failed (%s)\n",
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error_message(ret)));
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goto cont;
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}
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if (strcmp(principal, princ_s) != 0) {
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goto cont;
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}
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/* match found - remove */
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DEBUG(10, ("found entry for principal %s, kvno %d, "
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"enctype %d - trying to remove it\n",
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princ_s, kt_entry.vno, kt_entry.key.enctype));
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ret = krb5_kt_end_seq_get(context, keytab, &cursor);
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ZERO_STRUCT(cursor);
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if (ret) {
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DEBUG(5, ("krb5_kt_end_seq_get failed (%s)\n",
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error_message(ret)));
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goto cont;
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}
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ret = krb5_kt_remove_entry(context, keytab,
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&kt_entry);
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if (ret) {
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DEBUG(5, ("krb5_kt_remove_entry failed (%s)\n",
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error_message(ret)));
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goto cont;
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}
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DEBUG(10, ("removed entry for principal %s, kvno %d, "
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"enctype %d\n", princ_s, kt_entry.vno,
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kt_entry.key.enctype));
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ret = krb5_kt_start_seq_get(context, keytab, &cursor);
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if (ret) {
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DEBUG(5, ("krb5_kt_start_seq_get failed (%s)\n",
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error_message(ret)));
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goto cont;
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}
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cont:
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smb_krb5_kt_free_entry(context, &kt_entry);
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SAFE_FREE(princ_s);
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}
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ret = krb5_kt_end_seq_get(context, keytab, &cursor);
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if (ret) {
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DEBUG(5, ("krb5_kt_end_seq_get failed (%s)\n",
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error_message(ret)));
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}
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return ret;
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}
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static krb5_error_code libnet_keytab_add_entry(krb5_context context,
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krb5_keytab keytab,
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krb5_kvno kvno,
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const char *princ_s,
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krb5_enctype enctype,
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krb5_data password)
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{
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krb5_keyblock *keyp;
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krb5_keytab_entry kt_entry;
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krb5_error_code ret;
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/* remove duplicates first ... */
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ret = libnet_keytab_remove_entries(context, keytab, princ_s, kvno,
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enctype, false);
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if (ret) {
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DEBUG(1, ("libnet_keytab_remove_entries failed: %s\n",
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error_message(ret)));
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}
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ZERO_STRUCT(kt_entry);
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kt_entry.vno = kvno;
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ret = smb_krb5_parse_name(context, princ_s, &kt_entry.principal);
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if (ret) {
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DEBUG(1, ("smb_krb5_parse_name(%s) failed (%s)\n",
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princ_s, error_message(ret)));
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return ret;
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}
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#if !defined(HAVE_KRB5_KEYTAB_ENTRY_KEY) && !defined(HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK)
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#error krb5_keytab_entry has no key or keyblock member
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#endif
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#ifdef HAVE_KRB5_KEYTAB_ENTRY_KEY /* MIT */
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keyp = &kt_entry.key;
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#endif
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#ifdef HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK /* Heimdal */
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keyp = &kt_entry.keyblock;
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#endif
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if (create_kerberos_key_from_string(context, kt_entry.principal,
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&password, keyp, enctype, true))
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{
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ret = KRB5KRB_ERR_GENERIC;
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goto done;
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}
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ret = krb5_kt_add_entry(context, keytab, &kt_entry);
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if (ret) {
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DEBUG(1, ("adding entry to keytab failed (%s)\n",
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error_message(ret)));
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}
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done:
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krb5_free_keyblock_contents(context, keyp);
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krb5_free_principal(context, kt_entry.principal);
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ZERO_STRUCT(kt_entry);
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smb_krb5_kt_free_entry(context, &kt_entry);
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return ret;
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}
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krb5_error_code libnet_keytab_add(struct libnet_keytab_context *ctx)
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{
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krb5_error_code ret = 0;
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uint32_t i;
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for (i=0; i<ctx->count; i++) {
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struct libnet_keytab_entry *entry = &ctx->entries[i];
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krb5_data password;
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password.data = (char *)entry->password.data;
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password.length = entry->password.length;
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ret = libnet_keytab_add_entry(ctx->context,
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ctx->keytab,
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entry->kvno,
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entry->principal,
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entry->enctype,
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password);
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if (ret) {
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DEBUG(1,("libnet_keytab_add: "
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"Failed to add entry to keytab file\n"));
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return ret;
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}
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}
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return ret;
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}
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struct libnet_keytab_entry *libnet_keytab_search(struct libnet_keytab_context *ctx,
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const char *principal,
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int kvno,
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const krb5_enctype enctype,
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TALLOC_CTX *mem_ctx)
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{
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krb5_error_code ret = 0;
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krb5_kt_cursor cursor;
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krb5_keytab_entry kt_entry;
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struct libnet_keytab_entry *entry = NULL;
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ZERO_STRUCT(kt_entry);
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ZERO_STRUCT(cursor);
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ret = krb5_kt_start_seq_get(ctx->context, ctx->keytab, &cursor);
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if (ret) {
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DEBUG(10, ("krb5_kt_start_seq_get failed: %s",
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error_message(ret)));
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return NULL;
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}
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while (krb5_kt_next_entry(ctx->context, ctx->keytab, &kt_entry, &cursor) == 0)
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{
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char *princ_s = NULL;
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if (kt_entry.vno != kvno) {
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goto cont;
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}
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if (kt_entry.key.enctype != enctype) {
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goto cont;
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}
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ret = smb_krb5_unparse_name(ctx->context, kt_entry.principal,
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&princ_s);
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if (ret) {
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goto cont;
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}
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if (strcmp(principal, princ_s) != 0) {
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goto cont;
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}
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entry = talloc_zero(mem_ctx, struct libnet_keytab_entry);
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if (!entry) {
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DEBUG(3, ("talloc failed\n"));
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goto fail;
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}
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entry->name = talloc_strdup(entry, princ_s);
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if (!entry->name) {
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DEBUG(3, ("talloc_strdup_failed\n"));
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goto fail;
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}
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entry->principal = talloc_strdup(entry, princ_s);
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if (!entry->principal) {
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DEBUG(3, ("talloc_strdup_failed\n"));
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goto fail;
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}
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entry->password = data_blob_talloc(entry, kt_entry.key.contents,
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kt_entry.key.length);
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if (!entry->password.data) {
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DEBUG(3, ("data_blob_talloc failed\n"));
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goto fail;
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}
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DEBUG(10, ("found entry\n"));
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smb_krb5_kt_free_entry(ctx->context, &kt_entry);
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SAFE_FREE(princ_s);
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break;
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fail:
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smb_krb5_kt_free_entry(ctx->context, &kt_entry);
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SAFE_FREE(princ_s);
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TALLOC_FREE(entry);
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break;
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cont:
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smb_krb5_kt_free_entry(ctx->context, &kt_entry);
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SAFE_FREE(princ_s);
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continue;
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}
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krb5_kt_end_seq_get(ctx->context, ctx->keytab, &cursor);
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return entry;
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}
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#endif /* HAVE_KRB5 */
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