Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 910 insertions, 0 deletions

diff --git a/source3/libsmb/libsmb_server.c b/source3/libsmb/libsmb_server.c
new file mode 100644
index 0000000..69b51b8
--- /dev/null
+++ b/source3/libsmb/libsmb_server.c
@@ -0,0 +1,910 @@
+/*
+   Unix SMB/Netbios implementation.
+   SMB client library implementation
+   Copyright (C) Andrew Tridgell 1998
+   Copyright (C) Richard Sharpe 2000, 2002
+   Copyright (C) John Terpstra 2000
+   Copyright (C) Tom Jansen (Ninja ISD) 2002
+   Copyright (C) Derrell Lipman 2003-2008
+   Copyright (C) Jeremy Allison 2007, 2008
+   Copyright (C) SATOH Fumiyasu <fumiyas@osstech.co.jp> 2009.
+
+   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 "libsmb/libsmb.h"
+#include "libsmbclient.h"
+#include "libsmb_internal.h"
+#include "../librpc/gen_ndr/ndr_lsa.h"
+#include "rpc_client/cli_pipe.h"
+#include "rpc_client/cli_lsarpc.h"
+#include "libcli/security/security.h"
+#include "libsmb/nmblib.h"
+#include "../libcli/smb/smbXcli_base.h"
+
+/*
+ * Check a server for being alive and well.
+ * returns 0 if the server is in shape. Returns 1 on error
+ *
+ * Also usable outside libsmbclient to enable external cache
+ * to do some checks too.
+ */
+int
+SMBC_check_server(SMBCCTX * context,
+                  SMBCSRV * server)
+{
+	time_t now;
+
+	if (!cli_state_is_connected(server->cli)) {
+		return 1;
+	}
+
+	now = time_mono(NULL);
+
+	if (server->last_echo_time == (time_t)0 ||
+			now > server->last_echo_time +
+				(server->cli->timeout/1000)) {
+		unsigned char data[16] = {0};
+		NTSTATUS status = cli_echo(server->cli,
+					1,
+					data_blob_const(data, sizeof(data)));
+		if (!NT_STATUS_IS_OK(status)) {
+			bool ok = false;
+			/*
+			 * Some SMB2 servers (not Samba or Windows)
+			 * check the session status on SMB2_ECHO and return
+			 * NT_STATUS_USER_SESSION_DELETED
+			 * if the session was not set. That's OK, they still
+			 * replied.
+			 * BUG: https://bugzilla.samba.org/show_bug.cgi?id=13218
+			 */
+			if (smbXcli_conn_protocol(server->cli->conn) >=
+					PROTOCOL_SMB2_02) {
+				if (NT_STATUS_EQUAL(status,
+					    NT_STATUS_USER_SESSION_DELETED)) {
+					ok = true;
+				}
+			}
+			/*
+			 * Some NetApp servers return
+			 * NT_STATUS_INVALID_PARAMETER.That's OK, they still
+			 * replied.
+			 * BUG: https://bugzilla.samba.org/show_bug.cgi?id=13007
+			 */
+			if (NT_STATUS_EQUAL(status,
+					NT_STATUS_INVALID_PARAMETER)) {
+				ok = true;
+			}
+			if (!ok) {
+				return 1;
+			}
+		}
+		server->last_echo_time = now;
+	}
+	return 0;
+}
+
+/*
+ * Remove a server from the cached server list it's unused.
+ * On success, 0 is returned. 1 is returned if the server could not be removed.
+ *
+ * Also usable outside libsmbclient
+ */
+int
+SMBC_remove_unused_server(SMBCCTX * context,
+                          SMBCSRV * srv)
+{
+	SMBCFILE * file;
+
+	/* are we being fooled ? */
+	if (!context || !context->internal->initialized || !srv) {
+                return 1;
+        }
+
+	/* Check all open files/directories for a relation with this server */
+	for (file = context->internal->files; file; file = file->next) {
+		if (file->srv == srv) {
+			/* Still used */
+			DEBUG(3, ("smbc_remove_usused_server: "
+                                  "%p still used by %p.\n",
+				  srv, file));
+			return 1;
+		}
+	}
+
+	DLIST_REMOVE(context->internal->servers, srv);
+
+	cli_shutdown(srv->cli);
+	srv->cli = NULL;
+
+	DEBUG(3, ("smbc_remove_usused_server: %p removed.\n", srv));
+
+	smbc_getFunctionRemoveCachedServer(context)(context, srv);
+
+        SAFE_FREE(srv);
+	return 0;
+}
+
+/****************************************************************
+ * Call the auth_fn with fixed size (fstring) buffers.
+ ***************************************************************/
+static void
+SMBC_call_auth_fn(TALLOC_CTX *ctx,
+                  SMBCCTX *context,
+                  const char *server,
+                  const char *share,
+                  char **pp_workgroup,
+                  char **pp_username,
+                  char **pp_password)
+{
+	fstring workgroup = { 0 };
+	fstring username = { 0 };
+	fstring password = { 0 };
+        smbc_get_auth_data_with_context_fn auth_with_context_fn;
+
+	if (*pp_workgroup != NULL) {
+		strlcpy(workgroup, *pp_workgroup, sizeof(workgroup));
+	}
+	if (*pp_username != NULL) {
+		strlcpy(username, *pp_username, sizeof(username));
+	}
+	if (*pp_password != NULL) {
+		strlcpy(password, *pp_password, sizeof(password));
+	}
+
+        /* See if there's an authentication with context function provided */
+        auth_with_context_fn = smbc_getFunctionAuthDataWithContext(context);
+        if (auth_with_context_fn)
+        {
+            (* auth_with_context_fn)(context,
+                                     server, share,
+                                     workgroup, sizeof(workgroup),
+                                     username, sizeof(username),
+                                     password, sizeof(password));
+        }
+        else
+        {
+            smbc_getFunctionAuthData(context)(server, share,
+                                              workgroup, sizeof(workgroup),
+                                              username, sizeof(username),
+                                              password, sizeof(password));
+        }
+
+	TALLOC_FREE(*pp_workgroup);
+	TALLOC_FREE(*pp_username);
+	TALLOC_FREE(*pp_password);
+
+	*pp_workgroup = talloc_strdup(ctx, workgroup);
+	*pp_username = talloc_strdup(ctx, username);
+	*pp_password = talloc_strdup(ctx, password);
+}
+
+
+void
+SMBC_get_auth_data(const char *server, const char *share,
+                   char *workgroup_buf, int workgroup_buf_len,
+                   char *username_buf, int username_buf_len,
+                   char *password_buf, int password_buf_len)
+{
+        /* Default function just uses provided data.  Nothing to do. */
+}
+
+
+
+SMBCSRV *
+SMBC_find_server(TALLOC_CTX *ctx,
+                 SMBCCTX *context,
+                 const char *server,
+                 const char *share,
+                 char **pp_workgroup,
+                 char **pp_username,
+                 char **pp_password)
+{
+        SMBCSRV *srv;
+        int auth_called = 0;
+
+        if (!pp_workgroup || !pp_username || !pp_password) {
+                return NULL;
+        }
+
+check_server_cache:
+
+	srv = smbc_getFunctionGetCachedServer(context)(context,
+                                                       server, share,
+                                                       *pp_workgroup,
+                                                       *pp_username);
+
+	if (!auth_called && !srv && (!*pp_username || !(*pp_username)[0] ||
+                                     !*pp_password || !(*pp_password)[0])) {
+		SMBC_call_auth_fn(ctx, context, server, share,
+                                  pp_workgroup, pp_username, pp_password);
+
+		/*
+                 * However, smbc_auth_fn may have picked up info relating to
+                 * an existing connection, so try for an existing connection
+                 * again ...
+                 */
+		auth_called = 1;
+		goto check_server_cache;
+
+	}
+
+	if (srv) {
+		if (smbc_getFunctionCheckServer(context)(context, srv)) {
+			/*
+                         * This server is no good anymore
+                         * Try to remove it and check for more possible
+                         * servers in the cache
+                         */
+			if (smbc_getFunctionRemoveUnusedServer(context)(context,
+                                                                        srv)) {
+                                /*
+                                 * We could not remove the server completely,
+                                 * remove it from the cache so we will not get
+                                 * it again. It will be removed when the last
+                                 * file/dir is closed.
+                                 */
+				smbc_getFunctionRemoveCachedServer(context)(context,
+                                                                            srv);
+			}
+
+			/*
+                         * Maybe there are more cached connections to this
+                         * server
+                         */
+			goto check_server_cache;
+		}
+
+		return srv;
+ 	}
+
+        return NULL;
+}
+
+static struct cli_credentials *SMBC_auth_credentials(TALLOC_CTX *mem_ctx,
+						     SMBCCTX *context,
+						     const char *domain,
+						     const char *username,
+						     const char *password)
+{
+	struct cli_credentials *creds = NULL;
+	bool use_kerberos = false;
+	bool fallback_after_kerberos = false;
+	bool use_ccache = false;
+	bool pw_nt_hash = false;
+
+	use_kerberos = smbc_getOptionUseKerberos(context);
+	fallback_after_kerberos = smbc_getOptionFallbackAfterKerberos(context);
+	use_ccache = smbc_getOptionUseCCache(context);
+	pw_nt_hash = smbc_getOptionUseNTHash(context);
+
+	creds = cli_session_creds_init(mem_ctx,
+				       username,
+				       domain,
+				       NULL, /* realm */
+				       password,
+				       use_kerberos,
+				       fallback_after_kerberos,
+				       use_ccache,
+				       pw_nt_hash);
+	if (creds == NULL) {
+		return NULL;
+	}
+
+	switch (context->internal->smb_encryption_level) {
+	case SMBC_ENCRYPTLEVEL_DEFAULT:
+		/* Use the config option */
+		break;
+	case SMBC_ENCRYPTLEVEL_NONE:
+		(void)cli_credentials_set_smb_encryption(
+				creds,
+				SMB_ENCRYPTION_OFF,
+				CRED_SPECIFIED);
+		break;
+	case SMBC_ENCRYPTLEVEL_REQUEST:
+		(void)cli_credentials_set_smb_encryption(
+				creds,
+				SMB_ENCRYPTION_DESIRED,
+				CRED_SPECIFIED);
+		break;
+	case SMBC_ENCRYPTLEVEL_REQUIRE:
+	default:
+		(void)cli_credentials_set_smb_encryption(
+				creds,
+				SMB_ENCRYPTION_REQUIRED,
+				CRED_SPECIFIED);
+		break;
+	}
+
+
+	return creds;
+}
+
+/*
+ * Connect to a server, possibly on an existing connection
+ *
+ * Here, what we want to do is: If the server and username
+ * match an existing connection, reuse that, otherwise, establish a
+ * new connection.
+ *
+ * If we have to create a new connection, call the auth_fn to get the
+ * info we need, unless the username and password were passed in.
+ */
+
+static SMBCSRV *
+SMBC_server_internal(TALLOC_CTX *ctx,
+            SMBCCTX *context,
+            bool connect_if_not_found,
+            const char *server,
+            uint16_t port,
+            const char *share,
+            char **pp_workgroup,
+            char **pp_username,
+            char **pp_password,
+	    bool *in_cache)
+{
+	SMBCSRV *srv=NULL;
+	char *workgroup = NULL;
+	struct cli_state *c = NULL;
+	const char *server_n = server;
+        int is_ipc = (share != NULL && strcmp(share, "IPC$") == 0);
+	uint32_t fs_attrs = 0;
+	const char *username_used = NULL;
+	const char *password_used = NULL;
+ 	NTSTATUS status;
+	char *newserver, *newshare;
+	int flags = 0;
+	struct smbXcli_tcon *tcon = NULL;
+	int signing_state = SMB_SIGNING_DEFAULT;
+	struct cli_credentials *creds = NULL;
+
+	*in_cache = false;
+
+	if (server[0] == 0) {
+		errno = EPERM;
+		return NULL;
+	}
+
+        /* Look for a cached connection */
+        srv = SMBC_find_server(ctx, context, server, share,
+                               pp_workgroup, pp_username, pp_password);
+
+        /*
+         * If we found a connection and we're only allowed one share per
+         * server...
+         */
+        if (srv &&
+	    share != NULL && *share != '\0' &&
+            smbc_getOptionOneSharePerServer(context)) {
+
+                /*
+                 * ... then if there's no current connection to the share,
+                 * connect to it.  SMBC_find_server(), or rather the function
+                 * pointed to by context->get_cached_srv_fn which
+                 * was called by SMBC_find_server(), will have issued a tree
+                 * disconnect if the requested share is not the same as the
+                 * one that was already connected.
+                 */
+
+		/*
+		 * Use srv->cli->desthost and srv->cli->share instead of
+		 * server and share below to connect to the actual share,
+		 * i.e., a normal share or a referred share from
+		 * 'msdfs proxy' share.
+		 */
+                if (!cli_state_has_tcon(srv->cli)) {
+                        /* Ensure we have accurate auth info */
+			SMBC_call_auth_fn(ctx, context,
+					  smbXcli_conn_remote_name(srv->cli->conn),
+					  srv->cli->share,
+                                          pp_workgroup,
+                                          pp_username,
+                                          pp_password);
+
+			if (!*pp_workgroup || !*pp_username || !*pp_password) {
+				errno = ENOMEM;
+				cli_shutdown(srv->cli);
+				srv->cli = NULL;
+				smbc_getFunctionRemoveCachedServer(context)(context,
+                                                                            srv);
+				return NULL;
+			}
+
+			/*
+			 * We don't need to renegotiate encryption
+			 * here as the encryption context is not per
+			 * tid.
+			 */
+
+			status = cli_tree_connect(srv->cli,
+						  srv->cli->share,
+						  "?????",
+						  *pp_password);
+			if (!NT_STATUS_IS_OK(status)) {
+                                cli_shutdown(srv->cli);
+                                errno = map_errno_from_nt_status(status);
+				srv->cli = NULL;
+                                smbc_getFunctionRemoveCachedServer(context)(context,
+                                                                            srv);
+                                srv = NULL;
+				goto not_found;
+                        }
+
+                        /* Determine if this share supports case sensitivity */
+                        if (is_ipc) {
+                                DEBUG(4,
+                                      ("IPC$ so ignore case sensitivity\n"));
+                                status = NT_STATUS_OK;
+                        } else {
+                                status = cli_get_fs_attr_info(srv->cli, &fs_attrs);
+                        }
+
+                        if (!NT_STATUS_IS_OK(status)) {
+                                DEBUG(4, ("Could not retrieve "
+                                          "case sensitivity flag: %s.\n",
+                                          nt_errstr(status)));
+
+                                /*
+                                 * We can't determine the case sensitivity of
+                                 * the share. We have no choice but to use the
+                                 * user-specified case sensitivity setting.
+                                 */
+                                if (smbc_getOptionCaseSensitive(context)) {
+                                        cli_set_case_sensitive(srv->cli, true);
+                                } else {
+                                        cli_set_case_sensitive(srv->cli, false);
+                                }
+                        } else if (!is_ipc) {
+                                DEBUG(4,
+                                      ("Case sensitive: %s\n",
+                                       (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
+                                        ? "True"
+                                        : "False")));
+                                cli_set_case_sensitive(
+                                        srv->cli,
+                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
+                                         ? True
+                                         : False));
+                        }
+
+                        /*
+                         * Regenerate the dev value since it's based on both
+                         * server and share
+                         */
+                        if (srv) {
+				const char *remote_name =
+					smbXcli_conn_remote_name(srv->cli->conn);
+
+				srv->dev = (dev_t)(str_checksum(remote_name) ^
+                                                   str_checksum(srv->cli->share));
+                        }
+                }
+        }
+
+ not_found:
+
+        /* If we have a connection... */
+        if (srv) {
+
+                /* ... then we're done here.  Give 'em what they came for. */
+		*in_cache = true;
+                goto done;
+        }
+
+        /* If we're not asked to connect when a connection doesn't exist... */
+        if (! connect_if_not_found) {
+                /* ... then we're done here. */
+                return NULL;
+        }
+
+	if (!*pp_workgroup || !*pp_username || !*pp_password) {
+		errno = ENOMEM;
+		return NULL;
+	}
+
+	DEBUG(4,("SMBC_server: server_n=[%s] server=[%s]\n", server_n, server));
+
+	DEBUG(4,(" -> server_n=[%s] server=[%s]\n", server_n, server));
+
+	status = NT_STATUS_UNSUCCESSFUL;
+
+	if (context->internal->smb_encryption_level > SMBC_ENCRYPTLEVEL_NONE) {
+		signing_state = SMB_SIGNING_REQUIRED;
+	}
+
+	if (port == 0) {
+	        if (share == NULL || *share == '\0' || is_ipc) {
+			/*
+			 * Try 139 first for IPC$
+			 */
+			status = cli_connect_nb(server_n, NULL, NBT_SMB_PORT, 0x20,
+					smbc_getNetbiosName(context),
+					signing_state, flags, &c);
+		}
+	}
+
+	if (!NT_STATUS_IS_OK(status)) {
+		/*
+		 * No IPC$ or 139 did not work
+		 */
+		status = cli_connect_nb(server_n, NULL, port, 0x20,
+					smbc_getNetbiosName(context),
+					signing_state, flags, &c);
+	}
+
+	if (!NT_STATUS_IS_OK(status)) {
+		if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
+			DBG_ERR("NetBIOS support disabled, unable to connect\n");
+		}
+
+		errno = map_errno_from_nt_status(status);
+		return NULL;
+	}
+
+	cli_set_timeout(c, smbc_getTimeout(context));
+
+	status = smbXcli_negprot(c->conn,
+				 c->timeout,
+				 lp_client_min_protocol(),
+				 lp_client_max_protocol(),
+				 NULL,
+				 NULL,
+				 NULL);
+	if (!NT_STATUS_IS_OK(status)) {
+		cli_shutdown(c);
+		errno = map_errno_from_nt_status(status);
+		return NULL;
+	}
+
+	if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
+		/* Ensure we ask for some initial credits. */
+		smb2cli_conn_set_max_credits(c->conn, DEFAULT_SMB2_MAX_CREDITS);
+	}
+
+	username_used = *pp_username;
+	password_used = *pp_password;
+
+	creds = SMBC_auth_credentials(c,
+				      context,
+				      *pp_workgroup,
+				      username_used,
+				      password_used);
+	if (creds == NULL) {
+		cli_shutdown(c);
+		errno = ENOMEM;
+		return NULL;
+	}
+
+	status = cli_session_setup_creds(c, creds);
+	if (!NT_STATUS_IS_OK(status)) {
+
+                /* Failed.  Try an anonymous login, if allowed by flags. */
+		username_used = "";
+		password_used = "";
+
+                if (smbc_getOptionNoAutoAnonymousLogin(context) ||
+		    !NT_STATUS_IS_OK(cli_session_setup_anon(c))) {
+
+                        cli_shutdown(c);
+			errno = map_errno_from_nt_status(status);
+                        return NULL;
+                }
+	}
+
+	DEBUG(4,(" session setup ok\n"));
+
+	/* here's the fun part....to support 'msdfs proxy' shares
+	   (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
+	   here before trying to connect to the original share.
+	   cli_check_msdfs_proxy() will fail if it is a normal share. */
+
+	if (smbXcli_conn_dfs_supported(c->conn) &&
+			cli_check_msdfs_proxy(ctx, c, share,
+				&newserver, &newshare,
+				creds)) {
+		cli_shutdown(c);
+		srv = SMBC_server_internal(ctx, context, connect_if_not_found,
+				newserver, port, newshare, pp_workgroup,
+				pp_username, pp_password, in_cache);
+		TALLOC_FREE(newserver);
+		TALLOC_FREE(newshare);
+		return srv;
+	}
+
+	/* must be a normal share */
+
+	status = cli_tree_connect_creds(c, share, "?????", creds);
+	if (!NT_STATUS_IS_OK(status)) {
+		cli_shutdown(c);
+		errno = map_errno_from_nt_status(status);
+		return NULL;
+	}
+
+	DEBUG(4,(" tconx ok\n"));
+
+	if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
+		tcon = c->smb2.tcon;
+	} else {
+		tcon = c->smb1.tcon;
+	}
+
+        /* Determine if this share supports case sensitivity */
+	if (is_ipc) {
+                DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
+                status = NT_STATUS_OK;
+        } else {
+                status = cli_get_fs_attr_info(c, &fs_attrs);
+        }
+
+        if (!NT_STATUS_IS_OK(status)) {
+                DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
+                          nt_errstr(status)));
+
+                /*
+                 * We can't determine the case sensitivity of the share. We
+                 * have no choice but to use the user-specified case
+                 * sensitivity setting.
+                 */
+                if (smbc_getOptionCaseSensitive(context)) {
+                        cli_set_case_sensitive(c, True);
+                } else {
+                        cli_set_case_sensitive(c, False);
+                }
+	} else if (!is_ipc) {
+                DEBUG(4, ("Case sensitive: %s\n",
+                          (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
+                           ? "True"
+                           : "False")));
+		smbXcli_tcon_set_fs_attributes(tcon, fs_attrs);
+        }
+
+	/*
+	 * Ok, we have got a nice connection
+	 * Let's allocate a server structure.
+	 */
+
+	srv = SMB_MALLOC_P(SMBCSRV);
+	if (!srv) {
+		cli_shutdown(c);
+		errno = ENOMEM;
+		return NULL;
+	}
+
+	ZERO_STRUCTP(srv);
+	DLIST_ADD(srv->cli, c);
+	srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
+        srv->no_pathinfo = False;
+        srv->no_pathinfo2 = False;
+	srv->no_pathinfo3 = False;
+        srv->no_nt_session = False;
+
+done:
+	if (!pp_workgroup || !*pp_workgroup || !**pp_workgroup) {
+		workgroup = talloc_strdup(ctx, smbc_getWorkgroup(context));
+	} else {
+		workgroup = *pp_workgroup;
+	}
+	if(!workgroup) {
+		if (c != NULL) {
+			cli_shutdown(c);
+		}
+		SAFE_FREE(srv);
+		return NULL;
+	}
+
+	/* set the credentials to make DFS work */
+	smbc_set_credentials_with_fallback(context,
+					   workgroup,
+				    	   *pp_username,
+				   	   *pp_password);
+
+	return srv;
+}
+
+SMBCSRV *
+SMBC_server(TALLOC_CTX *ctx,
+		SMBCCTX *context,
+		bool connect_if_not_found,
+		const char *server,
+		uint16_t port,
+		const char *share,
+		char **pp_workgroup,
+		char **pp_username,
+		char **pp_password)
+{
+	SMBCSRV *srv=NULL;
+	bool in_cache = false;
+
+	srv = SMBC_server_internal(ctx, context, connect_if_not_found,
+			server, port, share, pp_workgroup,
+			pp_username, pp_password, &in_cache);
+
+	if (!srv) {
+		return NULL;
+	}
+	if (in_cache) {
+		return srv;
+	}
+
+	/* Now add it to the cache (internal or external)  */
+	/* Let the cache function set errno if it wants to */
+	errno = 0;
+	if (smbc_getFunctionAddCachedServer(context)(context, srv,
+						server, share,
+						*pp_workgroup,
+						*pp_username)) {
+		int saved_errno = errno;
+		DEBUG(3, (" Failed to add server to cache\n"));
+		errno = saved_errno;
+		if (errno == 0) {
+			errno = ENOMEM;
+		}
+		SAFE_FREE(srv);
+		return NULL;
+	}
+
+	DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
+		server, share, srv));
+
+	DLIST_ADD(context->internal->servers, srv);
+	return srv;
+}
+
+/*
+ * Connect to a server for getting/setting attributes, possibly on an existing
+ * connection.  This works similarly to SMBC_server().
+ */
+SMBCSRV *
+SMBC_attr_server(TALLOC_CTX *ctx,
+                 SMBCCTX *context,
+                 const char *server,
+                 uint16_t port,
+                 const char *share,
+                 char **pp_workgroup,
+                 char **pp_username,
+                 char **pp_password)
+{
+        int flags;
+	struct cli_state *ipc_cli = NULL;
+	struct rpc_pipe_client *pipe_hnd = NULL;
+        NTSTATUS nt_status;
+	SMBCSRV *srv=NULL;
+	SMBCSRV *ipc_srv=NULL;
+
+	/*
+	 * Use srv->cli->desthost and srv->cli->share instead of
+	 * server and share below to connect to the actual share,
+	 * i.e., a normal share or a referred share from
+	 * 'msdfs proxy' share.
+	 */
+	srv = SMBC_server(ctx, context, true, server, port, share,
+			pp_workgroup, pp_username, pp_password);
+	if (!srv) {
+		return NULL;
+	}
+	server = smbXcli_conn_remote_name(srv->cli->conn);
+	share = srv->cli->share;
+
+        /*
+         * See if we've already created this special connection.  Reference
+         * our "special" share name '*IPC$', which is an impossible real share
+         * name due to the leading asterisk.
+         */
+        ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
+                                   pp_workgroup, pp_username, pp_password);
+        if (!ipc_srv) {
+		struct cli_credentials *creds = NULL;
+
+                /* We didn't find a cached connection.  Get the password */
+		if (!*pp_password || (*pp_password)[0] == '\0') {
+                        /* ... then retrieve it now. */
+			SMBC_call_auth_fn(ctx, context, server, share,
+                                          pp_workgroup,
+                                          pp_username,
+                                          pp_password);
+			if (!*pp_workgroup || !*pp_username || !*pp_password) {
+				errno = ENOMEM;
+				return NULL;
+			}
+                }
+
+                flags = 0;
+
+		creds = SMBC_auth_credentials(NULL,
+					      context,
+					      *pp_workgroup,
+					      *pp_username,
+					      *pp_password);
+		if (creds == NULL) {
+			errno = ENOMEM;
+			return NULL;
+		}
+
+		nt_status = cli_full_connection_creds(&ipc_cli,
+						lp_netbios_name(), server,
+						NULL, 0, "IPC$", "?????",
+						creds,
+						flags);
+                if (! NT_STATUS_IS_OK(nt_status)) {
+			TALLOC_FREE(creds);
+                        DEBUG(1,("cli_full_connection failed! (%s)\n",
+                                 nt_errstr(nt_status)));
+                        errno = ENOTSUP;
+                        return NULL;
+                }
+		talloc_steal(ipc_cli, creds);
+
+                ipc_srv = SMB_MALLOC_P(SMBCSRV);
+                if (!ipc_srv) {
+                        errno = ENOMEM;
+                        cli_shutdown(ipc_cli);
+                        return NULL;
+                }
+
+                ZERO_STRUCTP(ipc_srv);
+                DLIST_ADD(ipc_srv->cli, ipc_cli);
+
+                nt_status = cli_rpc_pipe_open_noauth(
+			ipc_srv->cli, &ndr_table_lsarpc, &pipe_hnd);
+                if (!NT_STATUS_IS_OK(nt_status)) {
+                        DEBUG(1, ("cli_nt_session_open fail!\n"));
+                        errno = ENOTSUP;
+                        cli_shutdown(ipc_srv->cli);
+                        free(ipc_srv);
+                        return NULL;
+                }
+
+                /*
+                 * Some systems don't support
+                 * SEC_FLAG_MAXIMUM_ALLOWED, but NT sends 0x2000000
+                 * so we might as well do it too.
+                 */
+
+                nt_status = rpccli_lsa_open_policy(
+                        pipe_hnd,
+                        talloc_tos(),
+                        True,
+                        GENERIC_EXECUTE_ACCESS,
+                        &ipc_srv->pol);
+
+                if (!NT_STATUS_IS_OK(nt_status)) {
+                        cli_shutdown(ipc_srv->cli);
+                        free(ipc_srv);
+			errno = cli_status_to_errno(nt_status);
+                        return NULL;
+                }
+
+                /* now add it to the cache (internal or external) */
+
+                errno = 0;      /* let cache function set errno if it likes */
+                if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
+                                                             server,
+                                                             "*IPC$",
+                                                             *pp_workgroup,
+                                                             *pp_username)) {
+                        DEBUG(3, (" Failed to add server to cache\n"));
+                        if (errno == 0) {
+                                errno = ENOMEM;
+                        }
+                        cli_shutdown(ipc_srv->cli);
+                        free(ipc_srv);
+                        return NULL;
+                }
+
+                DLIST_ADD(context->internal->servers, ipc_srv);
+        }
+
+        return ipc_srv;
+}