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https://github.com/samba-team/samba.git
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d412f66cd8
contribution from remus@snapserver.com
thanks!
(This used to be commit 3ace8f1fcc
)
226 lines
5.8 KiB
C
226 lines
5.8 KiB
C
/*
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Unix SMB/Netbios implementation.
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Version 3.0
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kerberos utility library
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Copyright (C) Andrew Tridgell 2001
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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 2 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, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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#ifdef HAVE_KRB5
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/*
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simulate a kinit, putting the tgt in the default cache location
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remus@snapserver.com
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*/
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int kerberos_kinit_password(const char *principal, const char *password)
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{
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krb5_context ctx;
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krb5_error_code code = 0;
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krb5_ccache cc;
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krb5_principal me;
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krb5_creds my_creds;
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if ((code = krb5_init_context(&ctx)))
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return code;
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if ((code = krb5_cc_default(ctx, &cc))) {
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krb5_free_context(ctx);
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return code;
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}
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if ((code = krb5_parse_name(ctx, principal, &me))) {
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krb5_free_context(ctx);
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return code;
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}
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if ((code = krb5_get_init_creds_password(ctx, &my_creds, me, password, NULL,
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NULL, 0, NULL, NULL))) {
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krb5_free_principal(ctx, me);
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krb5_free_context(ctx);
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return code;
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}
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if ((code = krb5_cc_initialize(ctx, cc, me))) {
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krb5_free_cred_contents(ctx, &my_creds);
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krb5_free_principal(ctx, me);
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krb5_free_context(ctx);
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return code;
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}
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if ((code = krb5_cc_store_cred(ctx, cc, &my_creds))) {
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krb5_cc_close(ctx, cc);
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krb5_free_cred_contents(ctx, &my_creds);
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krb5_free_principal(ctx, me);
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krb5_free_context(ctx);
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return code;
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}
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krb5_cc_close(ctx, cc);
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krb5_free_cred_contents(ctx, &my_creds);
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krb5_free_principal(ctx, me);
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krb5_free_context(ctx);
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return 0;
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}
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/* run kinit to setup our ccache */
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int ads_kinit_password(ADS_STRUCT *ads)
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{
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char *s;
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int ret;
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extern pstring global_myname;
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fstring myname;
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fstrcpy(myname, global_myname);
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strlower(myname);
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asprintf(&s, "HOST/%s@%s", global_myname, ads->realm);
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ret = kerberos_kinit_password(s, ads->password);
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free(s);
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if (ret) {
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DEBUG(1,("kerberos_kinit_password failed: %s\n", error_message(ret)));
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}
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return ret;
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}
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/*
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verify an incoming ticket and parse out the principal name and
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authorization_data if available
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*/
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NTSTATUS ads_verify_ticket(ADS_STRUCT *ads, const DATA_BLOB *ticket,
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char **principal, DATA_BLOB *auth_data)
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{
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krb5_context context;
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krb5_auth_context auth_context = NULL;
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krb5_keytab keytab = NULL;
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krb5_data packet;
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krb5_ticket *tkt = NULL;
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krb5_data salt;
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krb5_encrypt_block eblock;
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int ret;
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krb5_keyblock * key;
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krb5_principal host_princ;
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char *host_princ_s;
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extern pstring global_myname;
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fstring myname;
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char *password_s;
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krb5_data password;
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if (!secrets_init()) {
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DEBUG(1,("secrets_init failed\n"));
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return NT_STATUS_LOGON_FAILURE;
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}
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password_s = secrets_fetch_machine_password();
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if (!password_s) {
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DEBUG(1,("failed to fetch machine password\n"));
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return NT_STATUS_LOGON_FAILURE;
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}
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password.data = password_s;
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password.length = strlen(password_s);
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ret = krb5_init_context(&context);
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if (ret) {
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DEBUG(1,("krb5_init_context failed (%s)\n", error_message(ret)));
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return NT_STATUS_LOGON_FAILURE;
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}
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ret = krb5_set_default_realm(context, ads->realm);
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if (ret) {
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DEBUG(1,("krb5_set_default_realm failed (%s)\n", error_message(ret)));
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ads_destroy(&ads);
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return NT_STATUS_LOGON_FAILURE;
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}
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/* this whole process is far more complex than I would
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like. We have to go through all this to allow us to store
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the secret internally, instead of using /etc/krb5.keytab */
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ret = krb5_auth_con_init(context, &auth_context);
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if (ret) {
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DEBUG(1,("krb5_auth_con_init failed (%s)\n", error_message(ret)));
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return NT_STATUS_LOGON_FAILURE;
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}
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fstrcpy(myname, global_myname);
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strlower(myname);
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asprintf(&host_princ_s, "HOST/%s@%s", myname, lp_realm());
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ret = krb5_parse_name(context, host_princ_s, &host_princ);
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if (ret) {
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DEBUG(1,("krb5_parse_name(%s) failed (%s)\n", host_princ_s, error_message(ret)));
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return NT_STATUS_LOGON_FAILURE;
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}
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ret = krb5_principal2salt(context, host_princ, &salt);
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if (ret) {
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DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
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return NT_STATUS_LOGON_FAILURE;
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}
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if (!(key = (krb5_keyblock *)malloc(sizeof(*key)))) {
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return NT_STATUS_NO_MEMORY;
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}
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krb5_use_enctype(context, &eblock, ENCTYPE_DES_CBC_MD5);
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ret = krb5_string_to_key(context, &eblock, key, &password, &salt);
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if (ret) {
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DEBUG(1,("krb5_string_to_key failed (%s)\n", error_message(ret)));
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return NT_STATUS_LOGON_FAILURE;
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}
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krb5_auth_con_setuseruserkey(context, auth_context, key);
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packet.length = ticket->length;
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packet.data = (krb5_pointer)ticket->data;
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#if 0
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file_save("/tmp/ticket.dat", ticket->data, ticket->length);
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#endif
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if ((ret = krb5_rd_req(context, &auth_context, &packet,
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NULL, keytab, NULL, &tkt))) {
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DEBUG(3,("krb5_rd_req with auth failed (%s)\n",
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error_message(ret)));
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return NT_STATUS_LOGON_FAILURE;
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}
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if (tkt->enc_part2) {
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*auth_data = data_blob(tkt->enc_part2->authorization_data[0]->contents,
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tkt->enc_part2->authorization_data[0]->length);
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}
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#if 0
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if (tkt->enc_part2) {
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file_save("/tmp/authdata.dat",
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tkt->enc_part2->authorization_data[0]->contents,
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tkt->enc_part2->authorization_data[0]->length);
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}
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#endif
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if ((ret = krb5_unparse_name(context, tkt->enc_part2->client, principal))) {
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DEBUG(3,("krb5_unparse_name failed (%s)\n",
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error_message(ret)));
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return NT_STATUS_LOGON_FAILURE;
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}
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return NT_STATUS_OK;
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}
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#endif
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