/*
Unix SMB/CIFS implementation.
- Authenticate to a remote server
- Copyright (C) Andrew Tridgell 1992-1998
- Copyright (C) Andrew Bartlett 2001
-
+ Authenticate by using a remote server
+ Copyright (C) Andrew Bartlett 2001-2002, 2008
+ Copyright (C) Jelmer Vernooij 2002
+ Copyright (C) Stefan Metzmacher 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
*/
#include "includes.h"
-
-/****************************************************************************
- Support for server level security.
-****************************************************************************/
-
-static struct smbcli_state *server_cryptkey(TALLOC_CTX *mem_ctx, bool unicode, int maxprotocol, struct resolve_context *resolve_ctx)
+#include "auth/auth.h"
+#include "auth/auth_proto.h"
+#include "auth/credentials/credentials.h"
+#include "libcli/security/security.h"
+#include "librpc/gen_ndr/ndr_samr.h"
+#include "libcli/smb_composite/smb_composite.h"
+#include "param/param.h"
+#include "libcli/resolve/resolve.h"
+
+/* This version of 'security=server' rewirtten from scratch for Samba4
+ * libraries in 2008 */
+
+
+static NTSTATUS server_want_check(struct auth_method_context *ctx,
+ TALLOC_CTX *mem_ctx,
+ const struct auth_usersupplied_info *user_info)
{
- struct smbcli_state *cli = NULL;
- fstring desthost;
- struct in_addr dest_ip;
- const char *p;
- char *pserver;
- bool connected_ok = false;
-
- if (!(cli = smbcli_initialise(cli)))
- return NULL;
-
- /* security = server just can't function with spnego */
- cli->use_spnego = false;
-
- pserver = talloc_strdup(mem_ctx, lp_passwordserver());
- p = pserver;
-
- while(next_token( &p, desthost, LIST_SEP, sizeof(desthost))) {
- strupper(desthost);
-
- if(!resolve_name(resolve_ctx, desthost, &dest_ip, 0x20)) {
- DEBUG(1,("server_cryptkey: Can't resolve address for %s\n",desthost));
- continue;
- }
-
- if (ismyip(dest_ip)) {
- DEBUG(1,("Password server loop - disabling password server %s\n",desthost));
- continue;
- }
-
- /* we use a mutex to prevent two connections at once - when a
- Win2k PDC get two connections where one hasn't completed a
- session setup yet it will send a TCP reset to the first
- connection (tridge) */
-
- if (!grab_server_mutex(desthost)) {
- return NULL;
- }
-
- if (smbcli_connect(cli, desthost, &dest_ip)) {
- DEBUG(3,("connected to password server %s\n",desthost));
- connected_ok = true;
- break;
- }
- }
+ return NT_STATUS_OK;
+}
+/**
+ * The challenge from the target server, when operating in security=server
+ **/
+static NTSTATUS server_get_challenge(struct auth_method_context *ctx, TALLOC_CTX *mem_ctx, DATA_BLOB *_blob)
+{
+ struct smb_composite_connect io;
+ struct smbcli_options smb_options;
+ const char **host_list;
+ NTSTATUS status;
- if (!connected_ok) {
- release_server_mutex();
- DEBUG(0,("password server not available\n"));
- talloc_free(cli);
- return NULL;
- }
+ /* Make a connection to the target server, found by 'password server' in smb.conf */
- if (!attempt_netbios_session_request(cli, lp_netbios_name(),
- desthost, &dest_ip)) {
- release_server_mutex();
- DEBUG(1,("password server fails session request\n"));
- talloc_free(cli);
- return NULL;
+ lp_smbcli_options(ctx->auth_ctx->lp_ctx, &smb_options);
+
+ /* Make a negprot, WITHOUT SPNEGO, so we get a challenge nice an easy */
+ io.in.options.use_spnego = false;
+
+ /* Hope we don't get * (the default), as this won't work... */
+ host_list = lp_passwordserver(ctx->auth_ctx->lp_ctx);
+ if (!host_list) {
+ return NT_STATUS_INTERNAL_ERROR;
}
-
- if (strequal(desthost,myhostname(mem_ctx))) {
- exit_server("Password server loop!");
+ io.in.dest_host = host_list[0];
+ if (strequal(io.in.dest_host, "*")) {
+ return NT_STATUS_INTERNAL_ERROR;
}
-
- DEBUG(3,("got session\n"));
+ io.in.dest_ports = lp_smb_ports(ctx->auth_ctx->lp_ctx);
- if (!smbcli_negprot(cli, unicode, maxprotocol)) {
- DEBUG(1,("%s rejected the negprot\n",desthost));
- release_server_mutex();
- talloc_free(cli);
- return NULL;
- }
+ io.in.called_name = strupper_talloc(mem_ctx, io.in.dest_host);
- if (cli->protocol < PROTOCOL_LANMAN2 ||
- !(cli->sec_mode & NEGOTIATE_SECURITY_USER_LEVEL)) {
- DEBUG(1,("%s isn't in user level security mode\n",desthost));
- release_server_mutex();
- talloc_free(cli);
- return NULL;
- }
+ /* We don't want to get as far as the session setup */
+ io.in.credentials = NULL;
+ io.in.service = NULL;
- /* Get the first session setup done quickly, to avoid silly
- Win2k bugs. (The next connection to the server will kill
- this one...
- */
-
- if (!smbcli_session_setup(cli, "", "", 0, "", 0,
- "")) {
- DEBUG(0,("%s rejected the initial session setup (%s)\n",
- desthost, smbcli_errstr(cli)));
- release_server_mutex();
- talloc_free(cli);
- return NULL;
- }
-
- release_server_mutex();
-
- DEBUG(3,("password server OK\n"));
-
- return cli;
-}
+ io.in.workgroup = ""; /* only used with SPNEGO, disabled above */
-/****************************************************************************
- Clean up our allocated cli.
-****************************************************************************/
+ io.in.options = smb_options;
-static void free_server_private_data(void **private_data_pointer)
-{
- struct smbcli_state **cli = (struct smbcli_state **)private_data_pointer;
- if (*cli && (*cli)->initialised) {
- talloc_free(*cli);
+ status = smb_composite_connect(&io, mem_ctx, lp_resolve_context(ctx->auth_ctx->lp_ctx),
+ ctx->auth_ctx->event_ctx);
+ if (!NT_STATUS_IS_OK(status)) {
+ *_blob = io.out.tree->session->transport->negotiate.secblob;
+ ctx->private_data = talloc_steal(ctx, io.out.tree->session);
}
+ return NT_STATUS_OK;
}
-/****************************************************************************
- Get the challenge out of a password server.
-****************************************************************************/
-
-static DATA_BLOB auth_get_challenge_server(const struct auth_context *auth_context,
- void **my_private_data,
- TALLOC_CTX *mem_ctx)
+/**
+ * Return an error based on username
+ *
+ * This function allows the testing of obsure errors, as well as the generation
+ * of NT_STATUS -> DOS error mapping tables.
+ *
+ * This module is of no value to end-users.
+ *
+ * The password is ignored.
+ *
+ * @return An NTSTATUS value based on the username
+ **/
+
+static NTSTATUS server_check_password(struct auth_method_context *ctx,
+ TALLOC_CTX *mem_ctx,
+ const struct auth_usersupplied_info *user_info,
+ struct auth_serversupplied_info **_server_info)
{
- struct smbcli_state *cli = server_cryptkey(mem_ctx, lp_cli_maxprotocol(auth_context->lp_ctx));
+ NTSTATUS nt_status;
+ struct auth_serversupplied_info *server_info;
+ struct cli_credentials *creds;
+ const char *user;
+ struct smb_composite_sesssetup session_setup;
+
+ struct smbcli_session *session = talloc_get_type(ctx->private_data, struct smbcli_session);
+
+ creds = cli_credentials_init(mem_ctx);
+
+ NT_STATUS_HAVE_NO_MEMORY(creds);
- if (cli) {
- DEBUG(3,("using password server validation\n"));
-
- if ((cli->sec_mode & NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) == 0) {
- /* We can't work with unencrypted password servers
- unless 'encrypt passwords = no' */
- DEBUG(5,("make_auth_info_server: Server is unencrypted, no challenge available..\n"));
-
- /* However, it is still a perfectly fine connection
- to pass that unencrypted password over */
- *my_private_data = (void *)cli;
- return data_blob(NULL, 0);
-
- } else if (cli->secblob.length < 8) {
- /* We can't do much if we don't get a full challenge */
- DEBUG(2,("make_auth_info_server: Didn't receive a full challenge from server\n"));
- talloc_free(cli);
- return data_blob(NULL, 0);
- }
-
- *my_private_data = (void *)cli;
-
- /* The return must be allocated on the caller's mem_ctx, as our own will be
- destoyed just after the call. */
- return data_blob_talloc(auth_context->mem_ctx, cli->secblob.data,8);
- } else {
- return data_blob(NULL, 0);
+ cli_credentials_set_username(creds, user_info->client.account_name, CRED_SPECIFIED);
+ cli_credentials_set_domain(creds, user_info->client.domain_name, CRED_SPECIFIED);
+
+ switch (user_info->password_state) {
+ case AUTH_PASSWORD_PLAIN:
+ cli_credentials_set_password(creds, user_info->password.plaintext,
+ CRED_SPECIFIED);
+ break;
+ case AUTH_PASSWORD_HASH:
+ cli_credentials_set_nt_hash(creds, user_info->password.hash.nt,
+ CRED_SPECIFIED);
+ break;
+
+ case AUTH_PASSWORD_RESPONSE:
+ cli_credentials_set_ntlm_response(creds, &user_info->password.response.lanman, &user_info->password.response.nt, CRED_SPECIFIED);
+ break;
}
-}
+ session_setup.in.sesskey = session->transport->negotiate.sesskey;
+ session_setup.in.capabilities = session->transport->negotiate.capabilities;
-/****************************************************************************
- Check for a valid username and password in security=server mode.
- - Validate a password with the password server.
-****************************************************************************/
+ session_setup.in.credentials = creds;
+ session_setup.in.workgroup = ""; /* Only used with SPNEGO, which we are not doing */
-static NTSTATUS check_smbserver_security(const struct auth_context *auth_context,
- void *my_private_data,
- TALLOC_CTX *mem_ctx,
- const auth_usersupplied_info *user_info,
- auth_serversupplied_info **server_info)
-{
- struct smbcli_state *cli;
- static uint8_t badpass[24];
- static fstring baduser;
- static bool tested_password_server = false;
- static bool bad_password_server = false;
- NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
- bool locally_made_cli = false;
-
- /*
- * Check that the requested domain is not our own machine name.
- * If it is, we should never check the PDC here, we use our own local
- * password file.
- */
-
- if (lp_is_myname(auth_context->lp_ctx, user_info->domain.str)) {
- DEBUG(3,("check_smbserver_security: Requested domain was for this machine.\n"));
- return NT_STATUS_LOGON_FAILURE;
- }
+ /* Check password with remove server - this should be async some day */
+ nt_status = smb_composite_sesssetup(session, &session_setup);
- cli = my_private_data;
-
- if (cli) {
- } else {
- cli = server_cryptkey(mem_ctx, lp_unicode(auth_context->lp_ctx), lp_cli_maxprotocol(auth_context->lp_ctx), lp_resolve_context(auth_context->lp_ctx));
- locally_made_cli = true;
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ return nt_status;
}
- if (!cli || !cli->initialised) {
- DEBUG(1,("password server is not connected (cli not initilised)\n"));
- return NT_STATUS_LOGON_FAILURE;
- }
-
- if ((cli->sec_mode & NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) == 0) {
- if (user_info->encrypted) {
- DEBUG(1,("password server %s is plaintext, but we are encrypted. This just can't work :-(\n", cli->desthost));
- return NT_STATUS_LOGON_FAILURE;
- }
- } else {
- if (memcmp(cli->secblob.data, auth_context->challenge.data, 8) != 0) {
- DEBUG(1,("the challenge that the password server (%s) supplied us is not the one we gave our client. This just can't work :-(\n", cli->desthost));
- return NT_STATUS_LOGON_FAILURE;
- }
- }
+ server_info = talloc(mem_ctx, struct auth_serversupplied_info);
+ NT_STATUS_HAVE_NO_MEMORY(server_info);
- if(badpass[0] == 0)
- memset(badpass, 0x1f, sizeof(badpass));
+ server_info->account_sid = dom_sid_parse_talloc(server_info, SID_NT_ANONYMOUS);
+ NT_STATUS_HAVE_NO_MEMORY(server_info->account_sid);
- if((user_info->nt_resp.length == sizeof(badpass)) &&
- !memcmp(badpass, user_info->nt_resp.data, sizeof(badpass))) {
- /*
- * Very unlikely, our random bad password is the same as the users
- * password.
- */
- memset(badpass, badpass[0]+1, sizeof(badpass));
- }
+ /* is this correct? */
+ server_info->primary_group_sid = dom_sid_parse_talloc(server_info, SID_BUILTIN_GUESTS);
+ NT_STATUS_HAVE_NO_MEMORY(server_info->primary_group_sid);
- if(baduser[0] == 0) {
- fstrcpy(baduser, INVALID_USER_PREFIX);
- fstrcat(baduser, lp_netbios_name());
- }
+ server_info->n_domain_groups = 0;
+ server_info->domain_groups = NULL;
- /*
- * Attempt a session setup with a totally incorrect password.
- * If this succeeds with the guest bit *NOT* set then the password
- * server is broken and is not correctly setting the guest bit. We
- * need to detect this as some versions of NT4.x are broken. JRA.
- */
-
- /* I sure as hell hope that there aren't servers out there that take
- * NTLMv2 and have this bug, as we don't test for that...
- * - abartlet@samba.org
- */
-
- if ((!tested_password_server) && (lp_paranoid_server_security())) {
- if (smbcli_session_setup(cli, baduser, (char *)badpass, sizeof(badpass),
- (char *)badpass, sizeof(badpass), user_info->domain.str)) {
-
- /*
- * We connected to the password server so we
- * can say we've tested it.
- */
- tested_password_server = true;
-
- if ((SVAL(cli->inbuf,smb_vwv2) & 1) == 0) {
- DEBUG(0,("server_validate: password server %s allows users as non-guest \
-with a bad password.\n", cli->desthost));
- DEBUG(0,("server_validate: This is broken (and insecure) behaviour. Please do not \
-use this machine as the password server.\n"));
- smbcli_ulogoff(cli);
-
- /*
- * Password server has the bug.
- */
- bad_password_server = true;
- return NT_STATUS_LOGON_FAILURE;
- }
- smbcli_ulogoff(cli);
- }
- } else {
-
- /*
- * We have already tested the password server.
- * Fail immediately if it has the bug.
- */
-
- if(bad_password_server) {
- DEBUG(0,("server_validate: [1] password server %s allows users as non-guest \
-with a bad password.\n", cli->desthost));
- DEBUG(0,("server_validate: [1] This is broken (and insecure) behaviour. Please do not \
-use this machine as the password server.\n"));
- return NT_STATUS_LOGON_FAILURE;
- }
- }
+ /* annoying, but the Anonymous really does have a session key,
+ and it is all zeros! */
+ server_info->user_session_key = data_blob(NULL, 0);
+ server_info->lm_session_key = data_blob(NULL, 0);
- /*
- * Now we know the password server will correctly set the guest bit, or is
- * not guest enabled, we can try with the real password.
- */
-
- if (!user_info->encrypted) {
- /* Plaintext available */
- if (!smbcli_session_setup(cli, user_info->smb_name.str,
- (char *)user_info->plaintext_password.data,
- user_info->plaintext_password.length,
- NULL, 0,
- user_info->domain.str)) {
- DEBUG(1,("password server %s rejected the password\n", cli->desthost));
- /* Make this smbcli_nt_error() when the conversion is in */
- nt_status = smbcli_nt_error(cli);
- } else {
- nt_status = NT_STATUS_OK;
- }
- } else {
- if (!smbcli_session_setup(cli, user_info->smb_name.str,
- (char *)user_info->lm_resp.data,
- user_info->lm_resp.length,
- (char *)user_info->nt_resp.data,
- user_info->nt_resp.length,
- user_info->domain.str)) {
- DEBUG(1,("password server %s rejected the password\n", cli->desthost));
- /* Make this smbcli_nt_error() when the conversion is in */
- nt_status = smbcli_nt_error(cli);
- } else {
- nt_status = NT_STATUS_OK;
- }
- }
+ server_info->account_name = talloc_strdup(server_info, user_info->client.account_name);
+ NT_STATUS_HAVE_NO_MEMORY(server_info->account_name);
- /* if logged in as guest then reject */
- if ((SVAL(cli->inbuf,smb_vwv2) & 1) != 0) {
- DEBUG(1,("password server %s gave us guest only\n", cli->desthost));
- nt_status = NT_STATUS_LOGON_FAILURE;
- }
+ server_info->domain_name = talloc_strdup(server_info, user_info->client.domain_name);
+ NT_STATUS_HAVE_NO_MEMORY(server_info->domain_name);
- smbcli_ulogoff(cli);
+ server_info->full_name = NULL;
- if NT_STATUS_IS_OK(nt_status) {
- struct passwd *pass = Get_Pwnam(user_info->internal_username.str);
- if (pass) {
- nt_status = make_server_info_pw(auth_context, server_info, pass);
- } else {
- nt_status = NT_STATUS_NO_SUCH_USER;
- }
- }
+ server_info->logon_script = talloc_strdup(server_info, "");
+ NT_STATUS_HAVE_NO_MEMORY(server_info->logon_script);
- if (locally_made_cli) {
- talloc_free(cli);
- }
+ server_info->profile_path = talloc_strdup(server_info, "");
+ NT_STATUS_HAVE_NO_MEMORY(server_info->profile_path);
+
+ server_info->home_directory = talloc_strdup(server_info, "");
+ NT_STATUS_HAVE_NO_MEMORY(server_info->home_directory);
+
+ server_info->home_drive = talloc_strdup(server_info, "");
+ NT_STATUS_HAVE_NO_MEMORY(server_info->home_drive);
+
+ server_info->last_logon = 0;
+ server_info->last_logoff = 0;
+ server_info->acct_expiry = 0;
+ server_info->last_password_change = 0;
+ server_info->allow_password_change = 0;
+ server_info->force_password_change = 0;
+
+ server_info->logon_count = 0;
+ server_info->bad_password_count = 0;
+
+ server_info->acct_flags = ACB_NORMAL;
- return(nt_status);
+ server_info->authenticated = false;
+
+ *_server_info = server_info;
+
+ return nt_status;
}
-NTSTATUS auth_init_smbserver(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
+static const struct auth_operations server_auth_ops = {
+ .name = "server",
+ .get_challenge = server_get_challenge,
+ .want_check = server_want_check,
+ .check_password = server_check_password
+};
+
+_PUBLIC_ NTSTATUS auth_server_init(void)
{
- if (!make_auth_methods(auth_context, auth_method)) {
- return NT_STATUS_NO_MEMORY;
+ NTSTATUS ret;
+
+ ret = auth_register(&server_auth_ops);
+ if (!NT_STATUS_IS_OK(ret)) {
+ DEBUG(0,("Failed to register 'server' auth backend!\n"));
+ return ret;
}
- (*auth_method)->name = "smbserver";
- (*auth_method)->auth = check_smbserver_security;
- (*auth_method)->get_chal = auth_get_challenge_server;
- (*auth_method)->send_keepalive = send_server_keepalive;
- (*auth_method)->free_private_data = free_server_private_data;
- return NT_STATUS_OK;
+
+ return ret;
}
git.samba.org / kai / samba.git / commitdiff