2 Unix SMB/CIFS implementation.
4 Samba kpasswd implementation
6 Copyright (c) 2005 Andrew Bartlett <abartlet@samba.org>
7 Copyright (c) 2016 Andreas Schneider <asn@samba.org>
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include "system/kerberos.h"
25 #include "librpc/gen_ndr/samr.h"
26 #include "dsdb/samdb/samdb.h"
27 #include "auth/auth.h"
28 #include "kdc/kpasswd-helper.h"
31 #define DBGC_CLASS DBGC_KERBEROS
33 bool kpasswd_make_error_reply(TALLOC_CTX *mem_ctx,
34 krb5_error_code error_code,
35 const char *error_string,
36 DATA_BLOB *error_data)
42 if (error_code == 0) {
43 DBG_DEBUG("kpasswd reply - %s\n", error_string);
45 DBG_INFO("kpasswd reply - %s\n", error_string);
48 ok = push_utf8_talloc(mem_ctx, &s, error_string, &slen);
54 * The string 's' has one terminating nul-byte which is also
55 * reflected by 'slen'. We subtract it from the length.
63 /* Two bytes are added to the length to account for the error code. */
64 if (2 + slen < slen) {
68 error_data->length = 2 + slen;
69 error_data->data = talloc_size(mem_ctx, error_data->length);
70 if (error_data->data == NULL) {
75 RSSVAL(error_data->data, 0, error_code);
76 memcpy(error_data->data + 2, s, slen);
83 bool kpasswd_make_pwchange_reply(TALLOC_CTX *mem_ctx,
85 enum samPwdChangeReason reject_reason,
86 struct samr_DomInfo1 *dominfo,
87 DATA_BLOB *error_blob)
89 const char *reject_string = NULL;
91 if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
92 return kpasswd_make_error_reply(mem_ctx,
93 KRB5_KPASSWD_ACCESSDENIED,
94 "No such user when changing password",
96 } else if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
97 return kpasswd_make_error_reply(mem_ctx,
98 KRB5_KPASSWD_ACCESSDENIED,
99 "Not permitted to change password",
102 if (dominfo != NULL &&
103 NT_STATUS_EQUAL(status, NT_STATUS_PASSWORD_RESTRICTION)) {
104 switch (reject_reason) {
105 case SAM_PWD_CHANGE_PASSWORD_TOO_SHORT:
107 talloc_asprintf(mem_ctx,
108 "Password too short, password "
109 "must be at least %d characters "
111 dominfo->min_password_length);
112 if (reject_string == NULL) {
113 reject_string = "Password too short";
116 case SAM_PWD_CHANGE_NOT_COMPLEX:
117 reject_string = "Password does not meet complexity "
120 case SAM_PWD_CHANGE_PWD_IN_HISTORY:
122 talloc_asprintf(mem_ctx,
123 "Password is already in password "
124 "history. New password must not "
125 "match any of your %d previous "
127 dominfo->password_history_length);
128 if (reject_string == NULL) {
129 reject_string = "Password is already in password "
134 reject_string = "Password change rejected, password "
135 "changes may not be permitted on this "
136 "account, or the minimum password age "
137 "may not have elapsed.";
141 return kpasswd_make_error_reply(mem_ctx,
142 KRB5_KPASSWD_SOFTERROR,
147 if (!NT_STATUS_IS_OK(status)) {
148 reject_string = talloc_asprintf(mem_ctx,
149 "Failed to set password: %s",
151 if (reject_string == NULL) {
152 reject_string = "Failed to set password";
154 return kpasswd_make_error_reply(mem_ctx,
155 KRB5_KPASSWD_HARDERROR,
160 return kpasswd_make_error_reply(mem_ctx,
161 KRB5_KPASSWD_SUCCESS,
166 NTSTATUS kpasswd_samdb_set_password(TALLOC_CTX *mem_ctx,
167 struct tevent_context *event_ctx,
168 struct loadparm_context *lp_ctx,
169 struct auth_session_info *session_info,
170 bool is_service_principal,
171 const char *target_principal_name,
173 enum samPwdChangeReason *reject_reason,
174 struct samr_DomInfo1 **dominfo)
177 struct ldb_context *samdb;
178 struct ldb_dn *target_dn = NULL;
181 samdb = samdb_connect(mem_ctx,
188 return NT_STATUS_INTERNAL_DB_CORRUPTION;
191 DBG_INFO("%s\\%s (%s) is changing password of %s\n",
192 session_info->info->domain_name,
193 session_info->info->account_name,
194 dom_sid_string(mem_ctx,
195 &session_info->security_token->sids[PRIMARY_USER_SID_INDEX]),
196 target_principal_name);
198 rc = ldb_transaction_start(samdb);
199 if (rc != LDB_SUCCESS) {
200 return NT_STATUS_TRANSACTION_ABORTED;
203 if (is_service_principal) {
204 status = crack_service_principal_name(samdb,
206 target_principal_name,
210 status = crack_user_principal_name(samdb,
212 target_principal_name,
216 if (!NT_STATUS_IS_OK(status)) {
217 ldb_transaction_cancel(samdb);
221 status = samdb_set_password(samdb,
224 NULL, /* domain_dn */
226 NULL, /* ntNewHash */
230 if (NT_STATUS_IS_OK(status)) {
231 rc = ldb_transaction_commit(samdb);
232 if (rc != LDB_SUCCESS) {
233 DBG_WARNING("Failed to commit transaction to "
234 "set password on %s: %s\n",
235 ldb_dn_get_linearized(target_dn),
236 ldb_errstring(samdb));
237 return NT_STATUS_TRANSACTION_ABORTED;
240 ldb_transaction_cancel(samdb);
246 krb5_error_code kpasswd_check_non_tgt(struct auth_session_info *session_info,
247 const char **error_string)
249 switch(session_info->ticket_type) {
250 case TICKET_TYPE_TGT:
251 /* TGTs are disallowed here. */
252 *error_string = "A TGT may not be used as a ticket to kpasswd";
253 return KRB5_KPASSWD_AUTHERROR;
254 case TICKET_TYPE_NON_TGT:
255 /* Non-TGTs are permitted, and expected. */
258 /* In case we forgot to set the type. */
259 *error_string = "Failed to ascertain that ticket to kpasswd is not a TGT";
260 return KRB5_KPASSWD_HARDERROR;