| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 | SMB client password change routine
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| 4 | Copyright (C) Andrew Tridgell 1994-1998
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| 5 |
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| 6 | This program is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 3 of the License, or
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| 9 | (at your option) any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 18 | */
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| 19 |
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| 20 | #include "includes.h"
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| 21 | #include "../librpc/gen_ndr/ndr_samr.h"
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| 22 | #include "rpc_client/cli_pipe.h"
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| 23 | #include "rpc_client/cli_samr.h"
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| 24 | #include "libsmb/libsmb.h"
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| 25 | #include "libsmb/clirap.h"
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| 26 | #include "libsmb/nmblib.h"
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| 27 | #include "../libcli/smb/smbXcli_base.h"
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| 28 |
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| 29 | /*************************************************************
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| 30 | Change a password on a remote machine using IPC calls.
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| 31 | *************************************************************/
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| 32 |
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| 33 | NTSTATUS remote_password_change(const char *remote_machine, const char *user_name,
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| 34 | const char *old_passwd, const char *new_passwd,
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| 35 | char **err_str)
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| 36 | {
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| 37 | struct cli_state *cli = NULL;
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| 38 | struct rpc_pipe_client *pipe_hnd = NULL;
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| 39 | char *user, *domain, *p;
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| 40 |
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| 41 | NTSTATUS result;
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| 42 | bool pass_must_change = False;
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| 43 |
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| 44 | user = talloc_strdup(talloc_tos(), user_name);
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| 45 | SMB_ASSERT(user != NULL);
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| 46 | domain = talloc_strdup(talloc_tos(), "");
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| 47 | SMB_ASSERT(domain != NULL);
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| 48 |
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| 49 | /* allow usernames of the form domain\\user or domain/user */
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| 50 | if ((p = strchr_m(user,'\\')) || (p = strchr_m(user,'/')) ||
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| 51 | (p = strchr_m(user,*lp_winbind_separator()))) {
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| 52 | *p = 0;
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| 53 | domain = user;
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| 54 | user = p+1;
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| 55 | }
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| 56 |
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| 57 | *err_str = NULL;
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| 58 |
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| 59 | result = cli_connect_nb(remote_machine, NULL, 0, 0x20, NULL,
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| 60 | SMB_SIGNING_IPC_DEFAULT, 0, &cli);
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| 61 | if (!NT_STATUS_IS_OK(result)) {
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| 62 | if (asprintf(err_str, "Unable to connect to SMB server on "
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| 63 | "machine %s. Error was : %s.\n",
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| 64 | remote_machine, nt_errstr(result))==-1) {
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| 65 | *err_str = NULL;
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| 66 | }
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| 67 | return result;
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| 68 | }
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| 69 |
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| 70 | result = smbXcli_negprot(cli->conn, cli->timeout,
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| 71 | lp_client_ipc_min_protocol(),
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| 72 | lp_client_ipc_max_protocol());
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| 73 |
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| 74 | if (!NT_STATUS_IS_OK(result)) {
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| 75 | if (asprintf(err_str, "machine %s rejected the negotiate "
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| 76 | "protocol. Error was : %s.\n",
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| 77 | remote_machine, nt_errstr(result)) == -1) {
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| 78 | *err_str = NULL;
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| 79 | }
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| 80 | cli_shutdown(cli);
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| 81 | return result;
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| 82 | }
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| 83 |
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| 84 | /* Given things like SMB signing, restrict anonymous and the like,
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| 85 | try an authenticated connection first */
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| 86 | result = cli_session_setup(cli, user_name,
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| 87 | old_passwd, strlen(old_passwd)+1,
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| 88 | old_passwd, strlen(old_passwd)+1, "");
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| 89 |
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| 90 | if (!NT_STATUS_IS_OK(result)) {
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| 91 |
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| 92 | /* Password must change or Password expired are the only valid
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| 93 | * error conditions here from where we can proceed, the rest like
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| 94 | * account locked out or logon failure will lead to errors later
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| 95 | * anyway */
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| 96 |
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| 97 | if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
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| 98 | !NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
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| 99 | if (asprintf(err_str, "Could not connect to machine %s: "
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| 100 | "%s\n", remote_machine, nt_errstr(result)) == -1) {
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| 101 | *err_str = NULL;
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| 102 | }
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| 103 | cli_shutdown(cli);
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| 104 | return result;
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| 105 | }
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| 106 |
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| 107 | pass_must_change = True;
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| 108 |
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| 109 | /*
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| 110 | * We should connect as the anonymous user here, in case
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| 111 | * the server has "must change password" checked...
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| 112 | * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
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| 113 | */
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| 114 |
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| 115 | result = cli_session_setup(cli, "", "", 0, "", 0, "");
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| 116 |
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| 117 | if (!NT_STATUS_IS_OK(result)) {
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| 118 | if (asprintf(err_str, "machine %s rejected the session "
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| 119 | "setup. Error was : %s.\n",
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| 120 | remote_machine, nt_errstr(result)) == -1) {
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| 121 | *err_str = NULL;
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| 122 | }
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| 123 | cli_shutdown(cli);
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| 124 | return result;
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| 125 | }
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| 126 | }
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| 127 |
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| 128 | result = cli_tree_connect(cli, "IPC$", "IPC", "", 1);
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| 129 | if (!NT_STATUS_IS_OK(result)) {
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| 130 | if (asprintf(err_str, "machine %s rejected the tconX on the "
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| 131 | "IPC$ share. Error was : %s.\n",
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| 132 | remote_machine, nt_errstr(result))) {
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| 133 | *err_str = NULL;
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| 134 | }
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| 135 | cli_shutdown(cli);
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| 136 | return result;
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| 137 | }
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| 138 |
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| 139 | /* Try not to give the password away too easily */
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| 140 |
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| 141 | if (!pass_must_change) {
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| 142 | result = cli_rpc_pipe_open_generic_auth(cli,
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| 143 | &ndr_table_samr,
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| 144 | NCACN_NP,
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| 145 | CRED_DONT_USE_KERBEROS,
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| 146 | DCERPC_AUTH_TYPE_NTLMSSP,
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| 147 | DCERPC_AUTH_LEVEL_PRIVACY,
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| 148 | remote_machine,
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| 149 | domain, user,
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| 150 | old_passwd,
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| 151 | &pipe_hnd);
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| 152 | } else {
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| 153 | /*
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| 154 | * If the user password must be changed the ntlmssp bind will
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| 155 | * fail the same way as the session setup above did. The
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| 156 | * difference ist that with a pipe bind we don't get a good
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| 157 | * error message, the result will be that the rpc call below
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| 158 | * will just fail. So we do it anonymously, there's no other
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| 159 | * way.
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| 160 | */
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| 161 | result = cli_rpc_pipe_open_noauth(
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| 162 | cli, &ndr_table_samr, &pipe_hnd);
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| 163 | }
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| 164 |
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| 165 | if (!NT_STATUS_IS_OK(result)) {
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| 166 | if (lp_client_lanman_auth()) {
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| 167 | /* Use the old RAP method. */
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| 168 | if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
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| 169 | result = cli_nt_error(cli);
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| 170 | if (asprintf(err_str, "machine %s rejected the "
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| 171 | "password change: Error was : %s.\n",
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| 172 | remote_machine, nt_errstr(result)) == -1) {
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| 173 | *err_str = NULL;
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| 174 | }
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| 175 | cli_shutdown(cli);
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| 176 | return result;
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| 177 | }
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| 178 | } else {
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| 179 | if (asprintf(err_str, "SAMR connection to machine %s "
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| 180 | "failed. Error was %s, but LANMAN password "
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| 181 | "changes are disabled\n",
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| 182 | remote_machine, nt_errstr(result)) == -1) {
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| 183 | *err_str = NULL;
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| 184 | }
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| 185 | cli_shutdown(cli);
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| 186 | return result;
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| 187 | }
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| 188 | }
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| 189 |
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| 190 | result = rpccli_samr_chgpasswd_user2(pipe_hnd, talloc_tos(),
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| 191 | user_name, new_passwd, old_passwd);
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| 192 | if (NT_STATUS_IS_OK(result)) {
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| 193 | /* Great - it all worked! */
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| 194 | cli_shutdown(cli);
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| 195 | return NT_STATUS_OK;
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| 196 |
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| 197 | } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
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| 198 | || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
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| 199 | /* it failed, but for reasons such as wrong password, too short etc ... */
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| 200 |
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| 201 | if (asprintf(err_str, "machine %s rejected the password change: "
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| 202 | "Error was : %s.\n",
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| 203 | remote_machine, get_friendly_nt_error_msg(result)) == -1) {
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| 204 | *err_str = NULL;
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| 205 | }
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| 206 | cli_shutdown(cli);
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| 207 | return result;
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| 208 | }
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| 209 |
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| 210 | /* OK, that failed, so try again... */
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| 211 | TALLOC_FREE(pipe_hnd);
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| 212 |
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| 213 | /* Try anonymous NTLMSSP... */
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| 214 | result = NT_STATUS_UNSUCCESSFUL;
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| 215 |
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| 216 | /* OK, this is ugly, but... try an anonymous pipe. */
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| 217 | result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr,
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| 218 | &pipe_hnd);
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| 219 |
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| 220 | if ( NT_STATUS_IS_OK(result) &&
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| 221 | (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user2(
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| 222 | pipe_hnd, talloc_tos(), user_name,
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| 223 | new_passwd, old_passwd)))) {
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| 224 | /* Great - it all worked! */
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| 225 | cli_shutdown(cli);
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| 226 | return NT_STATUS_OK;
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| 227 | } else {
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| 228 | if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
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| 229 | || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
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| 230 | /* it failed, but again it was due to things like new password too short */
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| 231 |
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| 232 | if (asprintf(err_str, "machine %s rejected the "
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| 233 | "(anonymous) password change: Error was : "
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| 234 | "%s.\n", remote_machine,
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| 235 | get_friendly_nt_error_msg(result)) == -1) {
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| 236 | *err_str = NULL;
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| 237 | }
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| 238 | cli_shutdown(cli);
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| 239 | return result;
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| 240 | }
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| 241 |
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| 242 | /* We have failed to change the user's password, and we think the server
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| 243 | just might not support SAMR password changes, so fall back */
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| 244 |
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| 245 | if (lp_client_lanman_auth()) {
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| 246 | /* Use the old RAP method. */
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| 247 | if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
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| 248 | /* SAMR failed, but the old LanMan protocol worked! */
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| 249 |
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| 250 | cli_shutdown(cli);
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| 251 | return NT_STATUS_OK;
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| 252 | }
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| 253 |
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| 254 | result = cli_nt_error(cli);
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| 255 | if (asprintf(err_str, "machine %s rejected the password "
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| 256 | "change: Error was : %s.\n",
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| 257 | remote_machine, nt_errstr(result)) == -1) {
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| 258 | *err_str = NULL;
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| 259 | }
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| 260 | cli_shutdown(cli);
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| 261 | return result;
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| 262 | } else {
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| 263 | if (asprintf(err_str, "SAMR connection to machine %s "
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| 264 | "failed. Error was %s, but LANMAN password "
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| 265 | "changes are disabled\n",
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| 266 | remote_machine, nt_errstr(result)) == -1) {
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| 267 | *err_str = NULL;
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| 268 | }
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| 269 | cli_shutdown(cli);
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| 270 | return NT_STATUS_UNSUCCESSFUL;
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| 271 | }
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| 272 | }
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| 273 | }
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