+++ /dev/null
-/*
- Unix SMB/CIFS implementation.
-
- kpasswd Server implementation
-
- Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
- Copyright (C) Andrew Tridgell 2005
-
- 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 3 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, see <http://www.gnu.org/licenses/>.
-*/
-
-#include "includes.h"
-#include "smbd/service_task.h"
-#include "auth/gensec/gensec.h"
-#include "auth/credentials/credentials.h"
-#include "auth/auth.h"
-#include "dsdb/samdb/samdb.h"
-#include "../lib/util/util_ldb.h"
-#include "libcli/security/security.h"
-#include "param/param.h"
-#include "kdc/kdc-server.h"
-#include "kdc/kdc-glue.h"
-#include "dsdb/common/util.h"
-#include "kdc/kpasswd_glue.h"
-#include "kdc/kpasswd-helper.h"
-
-/* Return true if there is a valid error packet formed in the error_blob */
-static bool kpasswdd_make_unauth_error_reply(struct kdc_server *kdc,
- TALLOC_CTX *mem_ctx,
- uint16_t result_code,
- const char *error_string,
- DATA_BLOB *error_blob)
-{
- bool ret;
- int kret;
- DATA_BLOB error_bytes;
- krb5_data k5_error_bytes, k5_error_blob;
- ret = kpasswd_make_error_reply(mem_ctx, result_code, error_string,
- &error_bytes);
- if (!ret) {
- return false;
- }
- k5_error_bytes.data = error_bytes.data;
- k5_error_bytes.length = error_bytes.length;
- kret = smb_krb5_mk_error(kdc->smb_krb5_context->krb5_context,
- result_code,
- NULL,
- &k5_error_bytes,
- NULL,
- NULL,
- &k5_error_blob);
- if (kret) {
- return false;
- }
- *error_blob = data_blob_talloc(mem_ctx, k5_error_blob.data, k5_error_blob.length);
- smb_krb5_free_data_contents(kdc->smb_krb5_context->krb5_context,
- &k5_error_blob);
- if (!error_blob->data) {
- return false;
- }
- return true;
-}
-
-/*
- A user password change
-
- Return true if there is a valid error packet (or success) formed in
- the error_blob
-*/
-static bool kpasswdd_change_password(struct kdc_server *kdc,
- TALLOC_CTX *mem_ctx,
- struct auth_session_info *session_info,
- const DATA_BLOB *password,
- DATA_BLOB *reply)
-{
- NTSTATUS status;
- NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
- enum samPwdChangeReason reject_reason;
- struct samr_DomInfo1 *dominfo;
- const char *error_string;
-
- status = samdb_kpasswd_change_password(mem_ctx,
- kdc->task->lp_ctx,
- kdc->task->event_ctx,
- kdc->samdb,
- session_info,
- password,
- &reject_reason,
- &dominfo,
- &error_string,
- &result);
- if (!NT_STATUS_IS_OK(status)) {
- return kpasswd_make_error_reply(mem_ctx,
- KRB5_KPASSWD_ACCESSDENIED,
- error_string,
- reply);
- }
-
- return kpasswd_make_pwchange_reply(mem_ctx,
- result,
- reject_reason,
- dominfo,
- reply);
-}
-
-static bool kpasswd_process_request(struct kdc_server *kdc,
- TALLOC_CTX *mem_ctx,
- struct gensec_security *gensec_security,
- uint16_t version,
- DATA_BLOB *input,
- DATA_BLOB *reply)
-{
- struct auth_session_info *session_info;
- size_t pw_len;
-
- if (!NT_STATUS_IS_OK(gensec_session_info(gensec_security,
- mem_ctx,
- &session_info))) {
- return kpasswd_make_error_reply(mem_ctx,
- KRB5_KPASSWD_HARDERROR,
- "gensec_session_info failed!",
- reply);
- }
-
- switch (version) {
- case KRB5_KPASSWD_VERS_CHANGEPW:
- {
- DATA_BLOB password;
- if (!convert_string_talloc_handle(mem_ctx, lpcfg_iconv_handle(kdc->task->lp_ctx),
- CH_UTF8, CH_UTF16,
- (const char *)input->data,
- input->length,
- (void **)&password.data, &pw_len)) {
- return false;
- }
- password.length = pw_len;
-
- return kpasswdd_change_password(kdc, mem_ctx, session_info,
- &password, reply);
- }
- case KRB5_KPASSWD_VERS_SETPW:
- {
- NTSTATUS status;
- enum samPwdChangeReason reject_reason = SAM_PWD_CHANGE_NO_ERROR;
- struct samr_DomInfo1 *dominfo = NULL;
- struct ldb_context *samdb;
- krb5_context context = kdc->smb_krb5_context->krb5_context;
-
- ChangePasswdDataMS chpw;
- DATA_BLOB password;
-
- krb5_principal principal;
- char *set_password_on_princ;
- struct ldb_dn *set_password_on_dn;
- bool service_principal_name = false;
-
- size_t len;
- int ret;
-
- ret = decode_ChangePasswdDataMS(input->data, input->length,
- &chpw, &len);
- if (ret) {
- return kpasswd_make_error_reply(mem_ctx,
- KRB5_KPASSWD_MALFORMED,
- "failed to decode password change structure",
- reply);
- }
-
- if (!convert_string_talloc_handle(mem_ctx, lpcfg_iconv_handle(kdc->task->lp_ctx),
- CH_UTF8, CH_UTF16,
- (const char *)chpw.newpasswd.data,
- chpw.newpasswd.length,
- (void **)&password.data, &pw_len)) {
- free_ChangePasswdDataMS(&chpw);
- return false;
- }
-
- password.length = pw_len;
-
- if ((chpw.targname && !chpw.targrealm)
- || (!chpw.targname && chpw.targrealm)) {
- free_ChangePasswdDataMS(&chpw);
- return kpasswd_make_error_reply(mem_ctx,
- KRB5_KPASSWD_MALFORMED,
- "Realm and principal must be both present, or neither present",
- reply);
- }
- if (chpw.targname && chpw.targrealm) {
- ret = krb5_build_principal_ext(kdc->smb_krb5_context->krb5_context,
- &principal,
- strlen(*chpw.targrealm),
- *chpw.targrealm, 0);
- if (ret) {
- free_ChangePasswdDataMS(&chpw);
- return kpasswd_make_error_reply(mem_ctx,
- KRB5_KPASSWD_MALFORMED,
- "failed to get principal",
- reply);
- }
- if (copy_PrincipalName(chpw.targname, &principal->name)) {
- free_ChangePasswdDataMS(&chpw);
- krb5_free_principal(context, principal);
- return kpasswd_make_error_reply(mem_ctx,
- KRB5_KPASSWD_MALFORMED,
- "failed to extract principal to set",
- reply);
- }
- } else {
- free_ChangePasswdDataMS(&chpw);
- return kpasswdd_change_password(kdc, mem_ctx, session_info,
- &password, reply);
- }
- free_ChangePasswdDataMS(&chpw);
-
- if (principal->name.name_string.len >= 2) {
- service_principal_name = true;
-
- /* We use this, rather than 'no realm' flag,
- * as we don't want to accept a password
- * change on a principal from another realm */
-
- if (krb5_unparse_name_short(context, principal, &set_password_on_princ) != 0) {
- krb5_free_principal(context, principal);
- return kpasswd_make_error_reply(mem_ctx,
- KRB5_KPASSWD_MALFORMED,
- "krb5_unparse_name failed!",
- reply);
- }
- } else {
- if (krb5_unparse_name(context, principal, &set_password_on_princ) != 0) {
- krb5_free_principal(context, principal);
- return kpasswd_make_error_reply(mem_ctx,
- KRB5_KPASSWD_MALFORMED,
- "krb5_unparse_name failed!",
- reply);
- }
- }
- krb5_free_principal(context, principal);
-
- samdb = samdb_connect(mem_ctx, kdc->task->event_ctx, kdc->task->lp_ctx, session_info, 0);
- if (!samdb) {
- free(set_password_on_princ);
- return kpasswd_make_error_reply(mem_ctx,
- KRB5_KPASSWD_HARDERROR,
- "Unable to open database!",
- reply);
- }
-
- DEBUG(3, ("%s\\%s (%s) is changing password of %s\n",
- session_info->info->domain_name,
- session_info->info->account_name,
- dom_sid_string(mem_ctx, &session_info->security_token->sids[PRIMARY_USER_SID_INDEX]),
- set_password_on_princ));
- ret = ldb_transaction_start(samdb);
- if (ret != LDB_SUCCESS) {
- free(set_password_on_princ);
- status = NT_STATUS_TRANSACTION_ABORTED;
- return kpasswd_make_pwchange_reply(mem_ctx,
- status,
- SAM_PWD_CHANGE_NO_ERROR,
- NULL,
- reply);
- }
-
- if (service_principal_name) {
- status = crack_service_principal_name(samdb, mem_ctx,
- set_password_on_princ,
- &set_password_on_dn, NULL);
- } else {
- status = crack_user_principal_name(samdb, mem_ctx,
- set_password_on_princ,
- &set_password_on_dn, NULL);
- }
- free(set_password_on_princ);
- if (!NT_STATUS_IS_OK(status)) {
- ldb_transaction_cancel(samdb);
- return kpasswd_make_pwchange_reply(mem_ctx,
- status,
- SAM_PWD_CHANGE_NO_ERROR,
- NULL,
- reply);
- }
-
- if (NT_STATUS_IS_OK(status)) {
- /* Admin password set */
- status = samdb_set_password(samdb, mem_ctx,
- set_password_on_dn, NULL,
- &password, NULL, NULL,
- NULL, NULL, /* this is not a user password change */
- &reject_reason, &dominfo);
- }
-
- if (NT_STATUS_IS_OK(status)) {
- ret = ldb_transaction_commit(samdb);
- if (ret != LDB_SUCCESS) {
- DEBUG(1,("Failed to commit transaction to set password on %s: %s\n",
- ldb_dn_get_linearized(set_password_on_dn),
- ldb_errstring(samdb)));
- status = NT_STATUS_TRANSACTION_ABORTED;
- }
- } else {
- ldb_transaction_cancel(samdb);
- }
- return kpasswd_make_pwchange_reply(mem_ctx,
- status,
- reject_reason,
- dominfo,
- reply);
- }
- default:
- return kpasswd_make_error_reply(mem_ctx,
- KRB5_KPASSWD_BAD_VERSION,
- talloc_asprintf(mem_ctx,
- "Protocol version %u not supported",
- version),
- reply);
- }
-}
-
-kdc_code kpasswdd_process(struct kdc_server *kdc,
- TALLOC_CTX *mem_ctx,
- DATA_BLOB *input,
- DATA_BLOB *reply,
- struct tsocket_address *peer_addr,
- struct tsocket_address *my_addr,
- int datagram_reply)
-{
- bool ret;
- const uint16_t header_len = 6;
- uint16_t len;
- uint16_t ap_req_len;
- uint16_t krb_priv_len;
- uint16_t version;
- NTSTATUS nt_status;
- DATA_BLOB ap_req, krb_priv_req;
- DATA_BLOB krb_priv_rep = data_blob(NULL, 0);
- DATA_BLOB ap_rep = data_blob(NULL, 0);
- DATA_BLOB kpasswd_req, kpasswd_rep;
- struct cli_credentials *server_credentials;
- struct gensec_security *gensec_security;
- TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
-
- char *keytab_name;
-
- if (!tmp_ctx) {
- return KDC_ERROR;
- }
-
- if (kdc->am_rodc) {
- talloc_free(tmp_ctx);
- return KDC_PROXY_REQUEST;
- }
-
- /* Be parinoid. We need to ensure we don't just let the
- * caller lead us into a buffer overflow */
- if (input->length <= header_len) {
- talloc_free(tmp_ctx);
- return KDC_ERROR;
- }
-
- len = RSVAL(input->data, 0);
- if (input->length != len) {
- talloc_free(tmp_ctx);
- return KDC_ERROR;
- }
-
- /* There are two different versions of this protocol so far,
- * plus others in the standards pipe. Fortunetly they all
- * take a very similar framing */
- version = RSVAL(input->data, 2);
- ap_req_len = RSVAL(input->data, 4);
- if ((ap_req_len >= len) || (ap_req_len + header_len) >= len) {
- talloc_free(tmp_ctx);
- return KDC_ERROR;
- }
-
- krb_priv_len = len - ap_req_len;
- ap_req = data_blob_const(&input->data[header_len], ap_req_len);
- krb_priv_req = data_blob_const(&input->data[header_len + ap_req_len], krb_priv_len);
-
- server_credentials = cli_credentials_init(tmp_ctx);
- if (!server_credentials) {
- DEBUG(1, ("Failed to init server credentials\n"));
- talloc_free(tmp_ctx);
- return KDC_ERROR;
- }
-
- /* We want the credentials subsystem to use the krb5 context
- * we already have, rather than a new context */
- cli_credentials_set_krb5_context(server_credentials, kdc->smb_krb5_context);
- cli_credentials_set_conf(server_credentials, kdc->task->lp_ctx);
-
- keytab_name = talloc_asprintf(server_credentials, "HDB:samba4&%p", kdc->base_ctx);
-
- cli_credentials_set_username(server_credentials, "kadmin/changepw", CRED_SPECIFIED);
- ret = cli_credentials_set_keytab_name(server_credentials, kdc->task->lp_ctx, keytab_name, CRED_SPECIFIED);
- if (ret != 0) {
- ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
- KRB5_KPASSWD_HARDERROR,
- talloc_asprintf(mem_ctx,
- "Failed to obtain server credentials for kadmin/changepw!"),
- &krb_priv_rep);
- ap_rep.length = 0;
- if (ret) {
- goto reply;
- }
- talloc_free(tmp_ctx);
- return ret;
- }
-
- /* We don't strictly need to call this wrapper, and could call
- * gensec_server_start directly, as we have no need for NTLM
- * and we have a PAC, but this ensures that the wrapper can be
- * safely extended for other helpful things in future */
- nt_status = samba_server_gensec_start(tmp_ctx, kdc->task->event_ctx,
- kdc->task->msg_ctx,
- kdc->task->lp_ctx,
- server_credentials,
- "kpasswd",
- &gensec_security);
- if (!NT_STATUS_IS_OK(nt_status)) {
- talloc_free(tmp_ctx);
- return KDC_ERROR;
- }
-
- /* The kerberos PRIV packets include these addresses. MIT
- * clients check that they are present */
-#if 0
- /* Skip this part for now, it breaks with a NetAPP filer and
- * in any case where the client address is behind NAT. If
- * older MIT clients need this, we might have to insert more
- * complex code */
-
- nt_status = gensec_set_remote_address(gensec_security, peer_addr);
- if (!NT_STATUS_IS_OK(nt_status)) {
- talloc_free(tmp_ctx);
- return KDC_ERROR;
- }
-#endif
-
- nt_status = gensec_set_local_address(gensec_security, my_addr);
- if (!NT_STATUS_IS_OK(nt_status)) {
- talloc_free(tmp_ctx);
- return KDC_ERROR;
- }
-
- /* We want the GENSEC wrap calls to generate PRIV tokens */
- gensec_want_feature(gensec_security, GENSEC_FEATURE_SEAL);
-
- nt_status = gensec_start_mech_by_name(gensec_security, "krb5");
- if (!NT_STATUS_IS_OK(nt_status)) {
- talloc_free(tmp_ctx);
- return KDC_ERROR;
- }
-
- /* Accept the AP-REQ and generate teh AP-REP we need for the reply */
- nt_status = gensec_update_ev(gensec_security, tmp_ctx, kdc->task->event_ctx, ap_req, &ap_rep);
- if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
-
- ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
- KRB5_KPASSWD_HARDERROR,
- talloc_asprintf(mem_ctx,
- "gensec_update failed: %s",
- nt_errstr(nt_status)),
- &krb_priv_rep);
- ap_rep.length = 0;
- if (ret) {
- goto reply;
- }
- talloc_free(tmp_ctx);
- return KDC_ERROR;
- }
-
- /* Extract the data from the KRB-PRIV half of the message */
- nt_status = gensec_unwrap(gensec_security, tmp_ctx, &krb_priv_req, &kpasswd_req);
- if (!NT_STATUS_IS_OK(nt_status)) {
- ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
- KRB5_KPASSWD_HARDERROR,
- talloc_asprintf(mem_ctx,
- "gensec_unwrap failed: %s",
- nt_errstr(nt_status)),
- &krb_priv_rep);
- ap_rep.length = 0;
- if (ret) {
- goto reply;
- }
- talloc_free(tmp_ctx);
- return KDC_ERROR;
- }
-
- /* Figure out something to do with it (probably changing a password...) */
- ret = kpasswd_process_request(kdc, tmp_ctx,
- gensec_security,
- version,
- &kpasswd_req, &kpasswd_rep);
- if (!ret) {
- /* Argh! */
- talloc_free(tmp_ctx);
- return KDC_ERROR;
- }
-
- /* And wrap up the reply: This ensures that the error message
- * or success can be verified by the client */
- nt_status = gensec_wrap(gensec_security, tmp_ctx,
- &kpasswd_rep, &krb_priv_rep);
- if (!NT_STATUS_IS_OK(nt_status)) {
- ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
- KRB5_KPASSWD_HARDERROR,
- talloc_asprintf(mem_ctx,
- "gensec_wrap failed: %s",
- nt_errstr(nt_status)),
- &krb_priv_rep);
- ap_rep.length = 0;
- if (ret) {
- goto reply;
- }
- talloc_free(tmp_ctx);
- return KDC_ERROR;
- }
-
-reply:
- *reply = data_blob_talloc(mem_ctx, NULL, krb_priv_rep.length + ap_rep.length + header_len);
- if (!reply->data) {
- talloc_free(tmp_ctx);
- return KDC_ERROR;
- }
-
- RSSVAL(reply->data, 0, reply->length);
- RSSVAL(reply->data, 2, 1); /* This is a version 1 reply, MS change/set or otherwise */
- RSSVAL(reply->data, 4, ap_rep.length);
- memcpy(reply->data + header_len,
- ap_rep.data,
- ap_rep.length);
- memcpy(reply->data + header_len + ap_rep.length,
- krb_priv_rep.data,
- krb_priv_rep.length);
-
- talloc_free(tmp_ctx);
- return KDC_OK;
-}
git.samba.org / metze / samba / wip.git / commitdiff