source: branches/samba-3.0/source/utils/net_rpc_join.c@ 134

/* 
   Samba Unix/Linux SMB client library 
   Distributed SMB/CIFS Server Management Utility 
   Copyright (C) 2001 Andrew Bartlett ([email protected])
   Copyright (C) Tim Potter     2001

   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
#include "includes.h"
#include "utils/net.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)
 *
 **/
int net_rpc_join_ok(const char *domain, const char *server, struct in_addr *ip )
{
        uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
        enum security_types sec;
        unsigned int conn_flags = NET_FLAGS_PDC;
        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();

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

        /* Connect to remote machine */
        if (!(cli = net_make_ipc_connection_ex(domain, server, ip, conn_flags))) {
                return -1;
        }

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

        /* 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 (!netlogon_pipe) {
                if (NT_STATUS_EQUAL(ntret, NT_STATUS_INVALID_NETWORK_RESPONSE)) {
                        cli_shutdown(cli);
                        return 0;
                } 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 -1;
                }
        }

        /* 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 0;
        }

        pipe_hnd = cli_rpc_pipe_open_schannel_with_key(cli, PI_NETLOGON,
                                PIPE_AUTH_LEVEL_PRIVACY,
                                domain, netlogon_pipe->dc, &ntret);

        if (!pipe_hnd) {
                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) ));
                cli_shutdown(cli);
                return -1;
        }

        cli_shutdown(cli);
        return 0;
}

/**
 * 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(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;
        uint32 sec_channel_type;
        struct rpc_pipe_client *pipe_hnd = NULL;

        /* rpc variables */

        POLICY_HND lsa_pol, sam_pol, domain_pol, user_pol;
        DOM_SID *domain_sid;
        uint32 user_rid;

        /* Password stuff */

        char *clear_trust_password = NULL;
        uchar pwbuf[516];
        SAM_USERINFO_CTR ctr;
        SAM_USER_INFO_24 p24;
        SAM_USER_INFO_16 p16;
        uchar md4_trust_password[16];

        /* Misc */

        NTSTATUS result;
        int retval = 1;
        char *domain = NULL;
        uint32 num_rids, *name_types, *user_rids;
        uint32 flags = 0x3e8;
        char *acct_name;
        const char *const_acct_name;
        uint32 acct_flags=0;

        /* 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
        }

        /* Make authenticated connection to remote machine */

        if (!(cli = net_make_ipc_connection(NET_FLAGS_PDC))) 
                return 1;

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

        /* Fetch domain sid */

        pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_LSARPC, &result);
        if (!pipe_hnd) {
                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_RIGHTS_MAXIMUM_ALLOWED,
                                          &lsa_pol),
                      "error opening lsa policy handle");

        CHECK_RPC_ERR(rpccli_lsa_query_info_policy(pipe_hnd, mem_ctx, &lsa_pol,
                                                5, &domain, &domain_sid),
                      "error querying info policy");

        rpccli_lsa_close(pipe_hnd, mem_ctx, &lsa_pol);
        cli_rpc_pipe_close(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 */
        pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_SAMR, &result);
        if (!pipe_hnd) {
                DEBUG(0, ("Error connecting to SAM pipe. Error was %s\n",
                        nt_errstr(result) ));
                goto done;
        }

        CHECK_RPC_ERR(rpccli_samr_connect(pipe_hnd, mem_ctx, 
                                       SEC_RIGHTS_MAXIMUM_ALLOWED,
                                       &sam_pol),
                      "could not connect to SAM database");

        
        CHECK_RPC_ERR(rpccli_samr_open_domain(pipe_hnd, mem_ctx, &sam_pol,
                                           SEC_RIGHTS_MAXIMUM_ALLOWED,
                                           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);
        const_acct_name = acct_name;

        acct_flags = SAMR_GENERIC_READ | SAMR_GENERIC_WRITE |
                SAMR_GENERIC_EXECUTE | SAMR_STANDARD_WRITEDAC |
                SAMR_STANDARD_DELETE | SAMR_USER_SETPASS | SAMR_USER_GETATTR |
                SAMR_USER_SETATTR;
        DEBUG(10, ("Creating account with flags: %d\n",acct_flags));
        result = rpccli_samr_create_dom_user(pipe_hnd, mem_ctx, &domain_pol,
                                          acct_name, acb_info,
                                          acct_flags, &user_pol, 
                                          &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_lookup_names(pipe_hnd, mem_ctx,
                                                  &domain_pol, flags,
                                                  1, &const_acct_name, 
                                                  &num_rids,
                                                  &user_rids, &name_types),
                            ("error looking up rid for user %s: %s\n",
                             acct_name, nt_errstr(result)));

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

        user_rid = user_rids[0];
                
        /* Open handle on user */

        CHECK_RPC_ERR_DEBUG(
                rpccli_samr_open_user(pipe_hnd, mem_ctx, &domain_pol,
                                   SEC_RIGHTS_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 */

        { 
                char *str;
                str = generate_random_str(DEFAULT_TRUST_ACCOUNT_PASSWORD_LENGTH);
                clear_trust_password = SMB_STRDUP(str);
                E_md4hash(clear_trust_password, md4_trust_password);
        }

        encode_pw_buffer(pwbuf, clear_trust_password, STR_UNICODE);

        /* Set password on machine account */

        ZERO_STRUCT(ctr);
        ZERO_STRUCT(p24);

        init_sam_user_info24(&p24, (char *)pwbuf,24);

        ctr.switch_value = 24;
        ctr.info.id24 = &p24;

        CHECK_RPC_ERR(rpccli_samr_set_userinfo(pipe_hnd, mem_ctx, &user_pol, 24, 
                                            &cli->user_session_key, &ctr),
                      "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 */

        ZERO_STRUCT(ctr);
        ctr.switch_value = 16;
        ctr.info.id16 = &p16;

        init_sam_user_info16(&p16, 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_set_userinfo2(pipe_hnd, mem_ctx, &user_pol, 16, 
                                        &cli->user_session_key, &ctr);

        rpccli_samr_close(pipe_hnd, mem_ctx, &user_pol);
        cli_rpc_pipe_close(pipe_hnd); /* Done with this pipe */

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

        pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_NETLOGON, &result);
        if (!pipe_hnd) {
                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\n"
                                 "named 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 = 
                                                cli_rpc_pipe_open_schannel_with_key(cli,
                                                        PI_NETLOGON,
                                                        PIPE_AUTH_LEVEL_PRIVACY,
                                                        domain,
                                                        pipe_hnd->dc,
                                                        &result);

                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\n"
                                         "named like this machine (%s) exists in the domain\n",
                                         global_myname());
                        }

                        goto done;
                }
                cli_rpc_pipe_close(netlogon_schannel_pipe);
        }

        cli_rpc_pipe_close(pipe_hnd);

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

        strupper_m(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 */
        retval = net_rpc_join_ok(domain, cli->desthost, &cli->dest_ip);
        
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);

        SAFE_FREE(clear_trust_password);

        return retval;
}

/**
 * check that a join is OK
 *
 * @return A shell status integer (0 for success)
 *
 **/
int net_rpc_testjoin(int argc, const char **argv) 
{
        char *domain = smb_xstrdup(opt_target_workgroup);

        /* Display success or failure */
        if (net_rpc_join_ok(domain, NULL, NULL) != 0) {
                fprintf(stderr,"Join to domain '%s' is not valid\n",domain);
                free(domain);
                return -1;
        }

        printf("Join to '%s' is OK\n",domain);
        free(domain);
        return 0;
}