s3-dcerpc: Pull packet in the caller, before validation

[Samba.git] / source3 / utils / net_rpc_join.c

/*
   Samba Unix/Linux SMB client library
   Distributed SMB/CIFS Server Management Utility
   Copyright (C) 2001 Andrew Bartlett (abartlet@samba.org)
   Copyright (C) Tim Potter     2001
   Copyright (C) 2008 Guenther Deschner

   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 "utils/net.h"
#include "../libcli/auth/libcli_auth.h"
#include "../librpc/gen_ndr/cli_lsa.h"
#include "rpc_client/cli_lsarpc.h"
#include "../librpc/gen_ndr/cli_samr.h"
#include "rpc_client/init_samr.h"
#include "../librpc/gen_ndr/ndr_netlogon.h"
#include "rpc_client/cli_netlogon.h"
#include "secrets.h"

/* Macro for checking RPC error codes to make things more readable */

#define CHECK_RPC_ERR(rpc, msg) \
        if (!NT_STATUS_IS_OK(result = rpc)) { \
                DEBUG(0, (msg ": %s\n", nt_errstr(result))); \
                goto done; \
        }

#define CHECK_RPC_ERR_DEBUG(rpc, debug_args) \
        if (!NT_STATUS_IS_OK(result = rpc)) { \
                DEBUG(0, debug_args); \
                goto done; \
        }

/**
 * confirm that a domain join is still valid
 *
 * @return A shell status integer (0 for success)
 *
 **/
NTSTATUS net_rpc_join_ok(struct net_context *c, const char *domain,
                         const char *server, struct sockaddr_storage *pss)
{
        enum security_types sec;
        unsigned int conn_flags = NET_FLAGS_PDC;
        uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
        struct cli_state *cli = NULL;
        struct rpc_pipe_client *pipe_hnd = NULL;
        struct rpc_pipe_client *netlogon_pipe = NULL;
        NTSTATUS ntret = NT_STATUS_UNSUCCESSFUL;

        sec = (enum security_types)lp_security();

        if (sec == SEC_ADS) {
                /* Connect to IPC$ using machine account's credentials. We don't use anonymous
                   connection here, as it may be denied by server's local policy. */
                net_use_machine_account(c);

        } else {
                /* some servers (e.g. WinNT) don't accept machine-authenticated
                   smb connections */
                conn_flags |= NET_FLAGS_ANONYMOUS;
        }

        /* Connect to remote machine */
        ntret = net_make_ipc_connection_ex(c, domain, server, pss, conn_flags,
                                           &cli);
        if (!NT_STATUS_IS_OK(ntret)) {
                return ntret;
        }

        /* Setup the creds as though we're going to do schannel... */
        ntret = get_schannel_session_key(cli, domain, &neg_flags,
                                         &netlogon_pipe);

        /* We return NT_STATUS_INVALID_NETWORK_RESPONSE if the server is refusing
           to negotiate schannel, but the creds were set up ok. That'll have to do. */

        if (!NT_STATUS_IS_OK(ntret)) {
                if (NT_STATUS_EQUAL(ntret, NT_STATUS_INVALID_NETWORK_RESPONSE)) {
                        cli_shutdown(cli);
                        return NT_STATUS_OK;
                } else {
                        DEBUG(0,("net_rpc_join_ok: failed to get schannel session "
                                        "key from server %s for domain %s. Error was %s\n",
                                cli->desthost, domain, nt_errstr(ntret) ));
                        cli_shutdown(cli);
                        return ntret;
                }
        }

        /* Only do the rest of the schannel test if the client is allowed to do this. */
        if (!lp_client_schannel()) {
                cli_shutdown(cli);
                /* We're good... */
                return ntret;
        }

        ntret = cli_rpc_pipe_open_schannel_with_key(
                cli, &ndr_table_netlogon.syntax_id, NCACN_NP,
                DCERPC_AUTH_LEVEL_PRIVACY,
                domain, &netlogon_pipe->dc, &pipe_hnd);

        if (!NT_STATUS_IS_OK(ntret)) {
                DEBUG(0,("net_rpc_join_ok: failed to open schannel session "
                                "on netlogon pipe to server %s for domain %s. Error was %s\n",
                        cli->desthost, domain, nt_errstr(ntret) ));
                /*
                 * Note: here, we have:
                 * (pipe_hnd != NULL) if and only if NT_STATUS_IS_OK(ntret)
                 */
        }

        cli_shutdown(cli);
        return ntret;
}

/**
 * Join a domain using the administrator username and password
 *
 * @param argc  Standard main() style argc
 * @param argc  Standard main() style argv.  Initial components are already
 *              stripped.  Currently not used.
 * @return A shell status integer (0 for success)
 *
 **/

int net_rpc_join_newstyle(struct net_context *c, int argc, const char **argv)
{

        /* libsmb variables */

        struct cli_state *cli;
        TALLOC_CTX *mem_ctx;
        uint32 acb_info = ACB_WSTRUST;
        uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
        enum netr_SchannelType sec_channel_type;
        struct rpc_pipe_client *pipe_hnd = NULL;

        /* rpc variables */

        struct policy_handle lsa_pol, sam_pol, domain_pol, user_pol;
        struct dom_sid *domain_sid;
        uint32 user_rid;

        /* Password stuff */

        char *clear_trust_password = NULL;
        struct samr_CryptPassword crypt_pwd;
        uchar md4_trust_password[16];
        union samr_UserInfo set_info;

        /* Misc */

        NTSTATUS result;
        int retval = 1;
        const char *domain = NULL;
        char *acct_name;
        struct lsa_String lsa_acct_name;
        uint32 acct_flags=0;
        uint32_t access_granted = 0;
        union lsa_PolicyInformation *info = NULL;
        struct samr_Ids user_rids;
        struct samr_Ids name_types;

        /* check what type of join */
        if (argc >= 0) {
                sec_channel_type = get_sec_channel_type(argv[0]);
        } else {
                sec_channel_type = get_sec_channel_type(NULL);
        }

        switch (sec_channel_type) {
        case SEC_CHAN_WKSTA:
                acb_info = ACB_WSTRUST;
                break;
        case SEC_CHAN_BDC:
                acb_info = ACB_SVRTRUST;
                break;
#if 0
        case SEC_CHAN_DOMAIN:
                acb_info = ACB_DOMTRUST;
                break;
#endif
        default:
                DEBUG(0,("secure channel type %d not yet supported\n",
                        sec_channel_type));
                break;
        }

        /* Make authenticated connection to remote machine */

        result = net_make_ipc_connection(c, NET_FLAGS_PDC, &cli);
        if (!NT_STATUS_IS_OK(result)) {
                return 1;
        }

        if (!(mem_ctx = talloc_init("net_rpc_join_newstyle"))) {
                DEBUG(0, ("Could not initialise talloc context\n"));
                goto done;
        }

        /* Fetch domain sid */

        result = cli_rpc_pipe_open_noauth(cli, &ndr_table_lsarpc.syntax_id,
                                          &pipe_hnd);
        if (!NT_STATUS_IS_OK(result)) {
                DEBUG(0, ("Error connecting to LSA pipe. Error was %s\n",
                        nt_errstr(result) ));
                goto done;
        }


        CHECK_RPC_ERR(rpccli_lsa_open_policy(pipe_hnd, mem_ctx, true,
                                          SEC_FLAG_MAXIMUM_ALLOWED,
                                          &lsa_pol),
                      "error opening lsa policy handle");

        CHECK_RPC_ERR(rpccli_lsa_QueryInfoPolicy(pipe_hnd, mem_ctx,
                                                 &lsa_pol,
                                                 LSA_POLICY_INFO_ACCOUNT_DOMAIN,
                                                 &info),
                      "error querying info policy");

        domain = info->account_domain.name.string;
        domain_sid = info->account_domain.sid;

        rpccli_lsa_Close(pipe_hnd, mem_ctx, &lsa_pol);
        TALLOC_FREE(pipe_hnd); /* Done with this pipe */

        /* Bail out if domain didn't get set. */
        if (!domain) {
                DEBUG(0, ("Could not get domain name.\n"));
                goto done;
        }

        /* Create domain user */
        result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr.syntax_id,
                                          &pipe_hnd);
        if (!NT_STATUS_IS_OK(result)) {
                DEBUG(0, ("Error connecting to SAM pipe. Error was %s\n",
                        nt_errstr(result) ));
                goto done;
        }

        CHECK_RPC_ERR(rpccli_samr_Connect2(pipe_hnd, mem_ctx,
                                           pipe_hnd->desthost,
                                           SAMR_ACCESS_ENUM_DOMAINS
                                           | SAMR_ACCESS_LOOKUP_DOMAIN,
                                           &sam_pol),
                      "could not connect to SAM database");


        CHECK_RPC_ERR(rpccli_samr_OpenDomain(pipe_hnd, mem_ctx,
                                             &sam_pol,
                                             SAMR_DOMAIN_ACCESS_LOOKUP_INFO_1
                                             | SAMR_DOMAIN_ACCESS_CREATE_USER
                                             | SAMR_DOMAIN_ACCESS_OPEN_ACCOUNT,
                                             domain_sid,
                                             &domain_pol),
                      "could not open domain");

        /* Create domain user */
        if ((acct_name = talloc_asprintf(mem_ctx, "%s$", global_myname())) == NULL) {
                result = NT_STATUS_NO_MEMORY;
                goto done;
        }
        strlower_m(acct_name);

        init_lsa_String(&lsa_acct_name, acct_name);

        acct_flags = SEC_GENERIC_READ | SEC_GENERIC_WRITE | SEC_GENERIC_EXECUTE |
                     SEC_STD_WRITE_DAC | SEC_STD_DELETE |
                     SAMR_USER_ACCESS_SET_PASSWORD |
                     SAMR_USER_ACCESS_GET_ATTRIBUTES |
                     SAMR_USER_ACCESS_SET_ATTRIBUTES;

        DEBUG(10, ("Creating account with flags: %d\n",acct_flags));

        result = rpccli_samr_CreateUser2(pipe_hnd, mem_ctx,
                                         &domain_pol,
                                         &lsa_acct_name,
                                         acb_info,
                                         acct_flags,
                                         &user_pol,
                                         &access_granted,
                                         &user_rid);

        if (!NT_STATUS_IS_OK(result) &&
            !NT_STATUS_EQUAL(result, NT_STATUS_USER_EXISTS)) {
                d_fprintf(stderr,_("Creation of workstation account failed\n"));

                /* If NT_STATUS_ACCESS_DENIED then we have a valid
                   username/password combo but the user does not have
                   administrator access. */

                if (NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_ACCESS_DENIED))
                        d_fprintf(stderr, _("User specified does not have "
                                            "administrator privileges\n"));

                goto done;
        }

        /* We *must* do this.... don't ask... */

        if (NT_STATUS_IS_OK(result)) {
                rpccli_samr_Close(pipe_hnd, mem_ctx, &user_pol);
        }

        CHECK_RPC_ERR_DEBUG(rpccli_samr_LookupNames(pipe_hnd, mem_ctx,
                                                    &domain_pol,
                                                    1,
                                                    &lsa_acct_name,
                                                    &user_rids,
                                                    &name_types),
                            ("error looking up rid for user %s: %s\n",
                             acct_name, nt_errstr(result)));

        if (name_types.ids[0] != SID_NAME_USER) {
                DEBUG(0, ("%s is not a user account (type=%d)\n", acct_name, name_types.ids[0]));
                goto done;
        }

        user_rid = user_rids.ids[0];

        /* Open handle on user */

        CHECK_RPC_ERR_DEBUG(
                rpccli_samr_OpenUser(pipe_hnd, mem_ctx,
                                     &domain_pol,
                                     SEC_FLAG_MAXIMUM_ALLOWED,
                                     user_rid,
                                     &user_pol),
                ("could not re-open existing user %s: %s\n",
                 acct_name, nt_errstr(result)));
        
        /* Create a random machine account password */

        clear_trust_password = generate_random_str(talloc_tos(), DEFAULT_TRUST_ACCOUNT_PASSWORD_LENGTH);
        E_md4hash(clear_trust_password, md4_trust_password);

        /* Set password on machine account */

        init_samr_CryptPassword(clear_trust_password,
                                &cli->user_session_key,
                                &crypt_pwd);

        set_info.info24.password = crypt_pwd;
        set_info.info24.password_expired = PASS_DONT_CHANGE_AT_NEXT_LOGON;

        CHECK_RPC_ERR(rpccli_samr_SetUserInfo2(pipe_hnd, mem_ctx,
                                               &user_pol,
                                               24,
                                               &set_info),
                      "error setting trust account password");

        /* Why do we have to try to (re-)set the ACB to be the same as what
           we passed in the samr_create_dom_user() call?  When a NT
           workstation is joined to a domain by an administrator the
           acb_info is set to 0x80.  For a normal user with "Add
           workstations to the domain" rights the acb_info is 0x84.  I'm
           not sure whether it is supposed to make a difference or not.  NT
           seems to cope with either value so don't bomb out if the set
           userinfo2 level 0x10 fails.  -tpot */

        set_info.info16.acct_flags = acb_info;

        /* Ignoring the return value is necessary for joining a domain
           as a normal user with "Add workstation to domain" privilege. */

        result = rpccli_samr_SetUserInfo(pipe_hnd, mem_ctx,
                                         &user_pol,
                                         16,
                                         &set_info);

        rpccli_samr_Close(pipe_hnd, mem_ctx, &user_pol);
        TALLOC_FREE(pipe_hnd); /* Done with this pipe */

        /* Now check the whole process from top-to-bottom */

        result = cli_rpc_pipe_open_noauth(cli, &ndr_table_netlogon.syntax_id,
                                          &pipe_hnd);
        if (!NT_STATUS_IS_OK(result)) {
                DEBUG(0,("Error connecting to NETLOGON pipe. Error was %s\n",
                        nt_errstr(result) ));
                goto done;
        }

        result = rpccli_netlogon_setup_creds(pipe_hnd,
                                        cli->desthost, /* server name */
                                        domain,        /* domain */
                                        global_myname(), /* client name */
                                        global_myname(), /* machine account name */
                                        md4_trust_password,
                                        sec_channel_type,
                                        &neg_flags);

        if (!NT_STATUS_IS_OK(result)) {
                DEBUG(0, ("Error in domain join verification (credential setup failed): %s\n\n",
                          nt_errstr(result)));

                if ( NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) &&
                     (sec_channel_type == SEC_CHAN_BDC) ) {
                        d_fprintf(stderr, _("Please make sure that no computer "
                                            "account\nnamed like this machine "
                                            "(%s) exists in the domain\n"),
                                 global_myname());
                }

                goto done;
        }

        /* We can only check the schannel connection if the client is allowed
           to do this and the server supports it. If not, just assume success
           (after all the rpccli_netlogon_setup_creds() succeeded, and we'll
           do the same again (setup creds) in net_rpc_join_ok(). JRA. */

        if (lp_client_schannel() && (neg_flags & NETLOGON_NEG_SCHANNEL)) {
                struct rpc_pipe_client *netlogon_schannel_pipe;

                result = cli_rpc_pipe_open_schannel_with_key(
                        cli, &ndr_table_netlogon.syntax_id, NCACN_NP,
                        DCERPC_AUTH_LEVEL_PRIVACY, domain, &pipe_hnd->dc,
                        &netlogon_schannel_pipe);

                if (!NT_STATUS_IS_OK(result)) {
                        DEBUG(0, ("Error in domain join verification (schannel setup failed): %s\n\n",
                                  nt_errstr(result)));

                        if ( NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) &&
                             (sec_channel_type == SEC_CHAN_BDC) ) {
                                d_fprintf(stderr, _("Please make sure that no "
                                                    "computer account\nnamed "
                                                    "like this machine (%s) "
                                                    "exists in the domain\n"),
                                         global_myname());
                        }

                        goto done;
                }
                TALLOC_FREE(netlogon_schannel_pipe);
        }

        TALLOC_FREE(pipe_hnd);

        /* Now store the secret in the secrets database */

        strupper_m(CONST_DISCARD(char *, domain));

        if (!secrets_store_domain_sid(domain, domain_sid)) {
                DEBUG(0, ("error storing domain sid for %s\n", domain));
                goto done;
        }

        if (!secrets_store_machine_password(clear_trust_password, domain, sec_channel_type)) {
                DEBUG(0, ("error storing plaintext domain secrets for %s\n", domain));
        }

        /* double-check, connection from scratch */
        result = net_rpc_join_ok(c, domain, cli->desthost, &cli->dest_ss);
        retval = NT_STATUS_IS_OK(result) ? 0 : -1;

done:

        /* Display success or failure */

        if (domain) {
                if (retval != 0) {
                        fprintf(stderr,_("Unable to join domain %s.\n"),domain);
                } else {
                        printf(_("Joined domain %s.\n"),domain);
                }
        }

        cli_shutdown(cli);

        TALLOC_FREE(clear_trust_password);

        return retval;
}

/**
 * check that a join is OK
 *
 * @return A shell status integer (0 for success)
 *
 **/
int net_rpc_testjoin(struct net_context *c, int argc, const char **argv)
{
        NTSTATUS nt_status;

        if (c->display_usage) {
                d_printf(_("Usage\n"
                           "net rpc testjoin\n"
                           "    Test if a join is OK\n"));
                return 0;
        }

        /* Display success or failure */
        nt_status = net_rpc_join_ok(c, c->opt_target_workgroup, NULL, NULL);
        if (!NT_STATUS_IS_OK(nt_status)) {
                fprintf(stderr, _("Join to domain '%s' is not valid: %s\n"),
                        c->opt_target_workgroup, nt_errstr(nt_status));
                return -1;
        }

        printf(_("Join to '%s' is OK\n"), c->opt_target_workgroup);
        return 0;
}