--- /dev/null
+/*
+ Unix SMB/CIFS implementation.
+ kerberos keytab utility library
+ Copyright (C) Andrew Tridgell 2001
+ Copyright (C) Remus Koos 2001
+ Copyright (C) Luke Howard 2003
+ Copyright (C) Jim McDonough (jmcd@us.ibm.com) 2003
+ Copyright (C) Guenther Deschner 2003
+ Copyright (C) Rakesh Patel 2004
+ Copyright (C) Dan Perry 2004
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+#ifdef HAVE_KRB5
+
+
+/*
+ Adds a single service principal, i.e. 'host' to the system keytab
+*/
+int ads_keytab_add_entry(const char *srvPrinc, ADS_STRUCT *ads)
+{
+ krb5_error_code ret;
+ krb5_context context;
+ krb5_keytab keytab;
+ krb5_kt_cursor cursor;
+ krb5_keytab_entry entry;
+ krb5_principal princ;
+ krb5_data password;
+ krb5_enctype *enctypes = NULL;
+ krb5_kvno kvno;
+ krb5_keyblock *key;
+
+ char *principal = NULL;
+ char *princ_s = NULL;
+ char *password_s = NULL;
+ char keytab_name[MAX_KEYTAB_NAME_LEN]; /* This MAX_NAME_LEN is a constant defined in krb5.h */
+ fstring myname;
+ int i;
+ int retval = 0;
+ char *ktprinc = NULL;
+ struct hostent *hp;
+
+ initialize_krb5_error_table();
+ ret = krb5_init_context(&context);
+ if (ret) {
+ DEBUG(1,("could not krb5_init_context: %s\n",error_message(ret)));
+ return -1;
+ }
+#ifdef HAVE_WRFILE_KEYTAB /* MIT */
+ keytab_name[0] = 'W';
+ keytab_name[1] = 'R';
+ ret = krb5_kt_default_name(context, (char *) &keytab_name[2], MAX_KEYTAB_NAME_LEN - 4);
+#else /* Heimdal */
+ ret = krb5_kt_default_name(context, (char *) &keytab_name[0], MAX_KEYTAB_NAME_LEN - 2);
+#endif
+ if (ret) {
+ DEBUG(1,("krb5_kt_default_name failed (%s)\n", error_message(ret)));
+ }
+ DEBUG(1,("Using default system keytab: %s\n", (char *) &keytab_name));
+ ret = krb5_kt_resolve(context, (char *) &keytab_name, &keytab);
+ if (ret) {
+ DEBUG(1,("krb5_kt_resolve failed (%s)\n", error_message(ret)));
+ return ret;
+ }
+
+ ret = get_kerberos_allowed_etypes(context,&enctypes);
+ if (ret) {
+ DEBUG(1,("get_kerberos_allowed_etypes failed (%s)\n",error_message(ret)));
+ goto out;
+ }
+
+ /* retrieve the password */
+ if (!secrets_init()) {
+ DEBUG(1,("secrets_init failed\n"));
+ ret = -1;
+ goto out;
+ }
+ password_s = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
+ if (!password_s) {
+ DEBUG(1,("failed to fetch machine password\n"));
+ ret = -1;
+ goto out;
+ }
+ password.data = password_s;
+ password.length = strlen(password_s);
+
+ /* Construct our principal */
+ fstrcpy(myname, global_myname());
+ hp = gethostbyname(myname);
+ if ( hp->h_name && strlen(hp->h_name) > 0 ) {
+ fstrcpy(myname,hp->h_name);
+ }
+ strlower_m(myname);
+ asprintf(&princ_s, "%s/%s@%s", srvPrinc, myname, lp_realm());
+
+ ret = krb5_parse_name(context, princ_s, &princ);
+ if (ret) {
+ DEBUG(1,("krb5_parse_name(%s) failed (%s)\n", princ_s, error_message(ret)));
+ goto out;
+ }
+
+ kvno = (krb5_kvno) ads_get_kvno(ads, global_myname());
+ if (kvno == -1) { /* -1 indicates failure, everything else is OK */
+ DEBUG(1,("ads_get_kvno failed to determine the system's kvno.\n"));
+ ret = -1;
+ goto out;
+ }
+
+ /* Seek and delete old keytab entries */
+ ret = krb5_kt_start_seq_get(context, keytab, &cursor);
+ if (ret != KRB5_KT_END && ret != ENOENT ) {
+ DEBUG(1,("Will try to delete old keytab entries\n"));
+ while(!krb5_kt_next_entry(context, keytab, &entry, &cursor)) {
+
+ krb5_unparse_name(context, entry.principal, &ktprinc);
+
+ /*---------------------------------------------------------------------------
+ * Save the entries with kvno - 1. This is what microsoft does
+ * to allow people with existing sessions that have kvno - 1 to still
+ * work. Otherwise, when the password for the machine changes, all
+ * kerberizied sessions will 'break' until either the client reboots or
+ * the client's session key expires and they get a new session ticket
+ * with the new kvno.
+ */
+
+#ifdef HAVE_KRB5_KT_COMPARE
+ if (krb5_kt_compare(context, &entry, princ, 0, 0) == True && entry.vno != kvno - 1) {
+#else
+ if (strcmp(ktprinc, princ_s) == 0 && entry.vno != kvno - 1) {
+#endif
+ free(ktprinc);
+ DEBUG(1,("Found old entry for principal: %s (kvno %d) - trying to remove it.\n",
+ princ_s, entry.vno));
+ ret = krb5_kt_end_seq_get(context, keytab, &cursor);
+ if (ret) {
+ DEBUG(1,("krb5_kt_end_seq_get() failed (%s)\n", error_message(ret)));
+ goto out;
+ }
+ ret = krb5_kt_remove_entry(context, keytab, &entry);
+ if (ret) {
+ DEBUG(1,("krb5_kt_remove_entry failed (%s)\n", error_message(ret)));
+ goto out;
+ }
+ ret = krb5_kt_start_seq_get(context, keytab, &cursor);
+ if (ret) {
+ DEBUG(1,("krb5_kt_start_seq failed (%s)\n", error_message(ret)));
+ goto out;
+ }
+ ret = krb5_kt_free_entry(context, &entry);
+ if (ret) {
+ DEBUG(1,("krb5_kt_remove_entry failed (%s)\n", error_message(ret)));
+ goto out;
+ }
+ continue;
+ } else {
+ free(ktprinc);
+ }
+
+ ret = krb5_kt_free_entry(context, &entry);
+ if (ret) {
+ DEBUG(1,("krb5_kt_free_entry failed (%s)\n", error_message(ret)));
+ goto out;
+ }
+ }
+
+ ret = krb5_kt_end_seq_get(context, keytab, &cursor);
+ if (ret) {
+ DEBUG(1,("krb5_kt_end_seq_get failed (%s)\n",error_message(ret)));
+ goto out;
+ }
+ }
+
+ /* Add keytab entries for all encryption types */
+ for (i = 0; enctypes[i]; i++) {
+
+ key = (krb5_keyblock *) malloc(sizeof(*key));
+ if (!key) {
+ DEBUG(1,("Failed to allocate memory to store the keyblock.\n"));
+ ret = ENOMEM;
+ goto out;
+ }
+
+ if (create_kerberos_key_from_string(context, princ, &password, key, enctypes[i])) {
+ continue;
+ }
+
+ entry.principal = princ;
+ entry.vno = kvno;
+
+#if !defined(HAVE_KRB5_KEYTAB_ENTRY_KEY) && !defined(HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK)
+#error krb5_keytab_entry has no key or keyblock member
+#endif
+#ifdef HAVE_KRB5_KEYTAB_ENTRY_KEY /* MIT */
+ entry.key = *key;
+#endif
+#ifdef HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK /* Heimdal */
+ entry.keyblock = *key;
+#endif
+ DEBUG(3,("adding keytab entry for (%s) with encryption type (%d) and version (%d)\n",
+ princ_s, enctypes[i], entry.vno));
+ ret = krb5_kt_add_entry(context, keytab, &entry);
+ krb5_free_keyblock(context, key);
+ if (ret) {
+ DEBUG(1,("adding entry to keytab failed (%s)\n", error_message(ret)));
+ krb5_kt_close(context, keytab);
+ goto out;
+ }
+ }
+
+ /* Update the LDAP with the SPN */
+ DEBUG(1,("Attempting to add/update '%s'\n", princ_s));
+ if (!ADS_ERR_OK(ads_add_spn(ads, global_myname(), srvPrinc))) {
+ DEBUG(1,("ads_add_spn failed.\n"));
+ goto out;
+ }
+
+out:
+
+ krb5_kt_close(context, keytab);
+ krb5_free_principal(context, princ);
+ if (enctypes) {
+ free(enctypes);
+ }
+ if (principal) {
+ free(principal);
+ }
+ if (password_s) {
+ free(password_s);
+ }
+ if (princ_s) {
+ free(princ_s);
+ }
+
+ return ret;
+}
+
+
+/*
+ Flushes all entries from the system keytab.
+*/
+int ads_keytab_flush(ADS_STRUCT *ads)
+{
+ krb5_error_code ret;
+ krb5_context context;
+ krb5_keytab keytab;
+ krb5_kt_cursor cursor;
+ krb5_keytab_entry entry;
+ krb5_kvno kvno;
+ char keytab_name[MAX_KEYTAB_NAME_LEN];
+
+ initialize_krb5_error_table();
+ ret = krb5_init_context(&context);
+ if (ret) {
+ DEBUG(1,("could not krb5_init_context: %s\n",error_message(ret)));
+ return ret;
+ }
+#ifdef HAVE_WRFILE_KEYTAB
+ keytab_name[0] = 'W';
+ keytab_name[1] = 'R';
+ ret = krb5_kt_default_name(context, (char *) &keytab_name[2], MAX_KEYTAB_NAME_LEN - 4);
+#else
+ ret = krb5_kt_default_name(context, (char *) &keytab_name[0], MAX_KEYTAB_NAME_LEN - 2);
+#endif
+ if (ret) {
+ DEBUG(1,("krb5_kt_default failed (%s)\n", error_message(ret)));
+ goto out;
+ }
+ DEBUG(1,("Using default keytab: %s\n", (char *) &keytab_name));
+ ret = krb5_kt_resolve(context, (char *) &keytab_name, &keytab);
+ if (ret) {
+ DEBUG(1,("krb5_kt_default failed (%s)\n", error_message(ret)));
+ goto out;
+ }
+ DEBUG(1,("Using default keytab: %s\n", (char *) &keytab_name));
+ ret = krb5_kt_resolve(context, (char *) &keytab_name, &keytab);
+ if (ret) {
+ DEBUG(1,("krb5_kt_default failed (%s)\n", error_message(ret)));
+ goto out;
+ }
+
+ kvno = (krb5_kvno) ads_get_kvno(ads, global_myname());
+ if (kvno == -1) { /* -1 indicates a failure */
+ DEBUG(1,("Error determining the system's kvno.\n"));
+ goto out;
+ }
+
+ ret = krb5_kt_start_seq_get(context, keytab, &cursor);
+ if (ret != KRB5_KT_END && ret != ENOENT) {
+ while (!krb5_kt_next_entry(context, keytab, &entry, &cursor)) {
+ ret = krb5_kt_end_seq_get(context, keytab, &cursor);
+ if (ret) {
+ DEBUG(1,("krb5_kt_end_seq_get() failed (%s)\n",error_message(ret)));
+ goto out;
+ }
+ ret = krb5_kt_remove_entry(context, keytab, &entry);
+ if (ret) {
+ DEBUG(1,("krb5_kt_remove_entry failed (%s)\n",error_message(ret)));
+ goto out;
+ }
+ ret = krb5_kt_start_seq_get(context, keytab, &cursor);
+ if (ret) {
+ DEBUG(1,("krb5_kt_start_seq failed (%s)\n",error_message(ret)));
+ goto out;
+ }
+ ret = krb5_kt_free_entry(context, &entry);
+ if (ret) {
+ DEBUG(1,("krb5_kt_remove_entry failed (%s)\n",error_message(ret)));
+ goto out;
+ }
+ }
+ }
+ if (!ADS_ERR_OK(ads_clear_spns(ads, global_myname()))) {
+ DEBUG(1,("Error while clearing service principal listings in LDAP.\n"));
+ goto out;
+ }
+
+out:
+
+ krb5_kt_close(context, keytab);
+ return ret;
+}
+
+
+int ads_keytab_create_default(ADS_STRUCT *ads)
+{
+ krb5_error_code ret;
+ krb5_context context;
+ krb5_keytab keytab;
+ krb5_kt_cursor cursor;
+ krb5_keytab_entry entry;
+ krb5_kvno kvno;
+ char *ktprinc;
+ int i, found = 0;
+ char **oldEntries;
+
+ ret = ads_keytab_add_entry("host", ads);
+ if (ret) {
+ DEBUG(1,("ads_keytab_add_entry failed while adding 'host'.\n"));
+ return ret;
+ }
+ ret = ads_keytab_add_entry("cifs", ads);
+ if (ret) {
+ DEBUG(1,("ads_keytab_add_entry failed while adding 'cifs'.\n"));
+ return ret;
+ }
+
+ kvno = (krb5_kvno) ads_get_kvno(ads, global_myname());
+ if (kvno == -1) {
+ DEBUG(1,("ads_get_kvno failed to determine the system's kvno.\n"));
+ return -1;
+ }
+
+ DEBUG(1,("Searching for keytab entries to preserve and update.\n"));
+ /* Now loop through the keytab and update any other existing entries... */
+ initialize_krb5_error_table();
+ ret = krb5_init_context(&context);
+ if (ret) {
+ DEBUG(1,("could not krb5_init_context: %s\n",error_message(ret)));
+ return ret;
+ }
+ ret = krb5_kt_default(context, &keytab);
+ if (ret) {
+ DEBUG(1,("krb5_kt_default failed (%s)\n",error_message(ret)));
+ return ret;
+ }
+
+ ret = krb5_kt_start_seq_get(context, keytab, &cursor);
+ if (ret != KRB5_KT_END && ret != ENOENT ) {
+ while ((ret = krb5_kt_next_entry(context, keytab, &entry, &cursor)) == 0) {
+ found++;
+ }
+ }
+
+ DEBUG(1, ("Found %d entries in the keytab.\n", found));
+ if (!found) {
+ goto done;
+ }
+ oldEntries = (char **) malloc(found * sizeof(char *));
+ if (!oldEntries) {
+ DEBUG(1,("Failed to allocate space to store the old keytab entries (malloc failed?).\n"));
+ return ENOMEM;
+ }
+ memset(oldEntries, 0, found * sizeof(char *));
+
+ ret = krb5_kt_start_seq_get(context, keytab, &cursor);
+ if (ret != KRB5_KT_END && ret != ENOENT ) {
+ while ((ret = krb5_kt_next_entry(context, keytab, &entry, &cursor)) == 0) {
+ if (entry.vno != kvno) {
+ krb5_unparse_name(context, entry.principal, &ktprinc);
+ for (i = 0; *(ktprinc + i); i++) {
+ if (*(ktprinc + i) == '/') {
+ *(ktprinc + i) = (char) NULL;
+ break;
+ }
+ }
+ for (i = 0; i < found; i++) {
+ if (!oldEntries[i]) {
+ oldEntries[i] = ktprinc;
+ break;
+ }
+ if (!strcmp(oldEntries[i], ktprinc)) {
+ break;
+ }
+ }
+ }
+ }
+ for (i = 0; oldEntries[i]; i++) {
+ ret |= ads_keytab_add_entry(oldEntries[i], ads);
+ free(oldEntries[i]);
+ }
+ }
+ free(oldEntries);
+
+done:
+
+ krb5_kt_close(context, keytab);
+ return ret;
+}
+#endif /* HAVE_KRB5 */
git.samba.org / samba.git / commitdiff