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-rw-r--r--source3/smbd/msdfs.c1774
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diff --git a/source3/smbd/msdfs.c b/source3/smbd/msdfs.c
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--- /dev/null
+++ b/source3/smbd/msdfs.c
@@ -0,0 +1,1774 @@
+/*
+ Unix SMB/Netbios implementation.
+ Version 3.0
+ MSDFS services for Samba
+ Copyright (C) Shirish Kalele 2000
+ Copyright (C) Jeremy Allison 2007
+ Copyright (C) Robin McCorkell 2015
+
+ 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/>.
+
+*/
+
+#define DBGC_CLASS DBGC_MSDFS
+#include "includes.h"
+#include "system/filesys.h"
+#include "smbd/smbd.h"
+#include "smbd/globals.h"
+#include "msdfs.h"
+#include "auth.h"
+#include "../auth/auth_util.h"
+#include "lib/param/loadparm.h"
+#include "libcli/security/security.h"
+#include "librpc/gen_ndr/ndr_dfsblobs.h"
+#include "lib/tsocket/tsocket.h"
+#include "lib/global_contexts.h"
+#include "source3/lib/substitute.h"
+#include "source3/smbd/dir.h"
+
+/**********************************************************************
+ Parse a DFS pathname of the form(s)
+
+ \hostname\service - self referral
+ \hostname\service\remainingpath - Windows referral path
+
+ FIXME! Should we also parse:
+ \hostname\service/remainingpath - POSIX referral path
+ as currently nothing uses this ?
+
+ into the dfs_path components. Strict form.
+
+ Checks DFS path starts with separator.
+ Checks hostname is ours.
+ Ensures servicename (share) is sent, and
+ if so, terminates the name or is followed by
+ \pathname.
+
+ If returned, remainingpath is untouched. Caller must call
+ check_path_syntax() on it.
+
+ Called by all non-fileserver processing (DFS RPC, FSCTL_DFS_GET_REFERRALS)
+ etc. Errors out on any inconsistency in the path.
+**********************************************************************/
+
+static NTSTATUS parse_dfs_path_strict(TALLOC_CTX *ctx,
+ const char *pathname,
+ char **_hostname,
+ char **_servicename,
+ char **_remaining_path)
+{
+ char *pathname_local = NULL;
+ char *p = NULL;
+ const char *hostname = NULL;
+ const char *servicename = NULL;
+ const char *reqpath = NULL;
+ bool my_hostname = false;
+ NTSTATUS status;
+
+ DBG_DEBUG("path = |%s|\n", pathname);
+
+ pathname_local = talloc_strdup(talloc_tos(), pathname);
+ if (pathname_local == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+ /*
+ * parse_dfs_path_strict() is called from
+ * get_referred_path() and create_junction()
+ * which use Windows DFS paths of \server\share.
+ */
+
+ /*
+ * Strict DFS paths *must* start with the
+ * path separator '\\'.
+ */
+
+ if (pathname_local[0] != '\\') {
+ DBG_ERR("path %s doesn't start with \\\n",
+ pathname_local);
+ status = NT_STATUS_NOT_FOUND;
+ goto out;
+ }
+
+ /* Now tokenize. */
+ /* Parse out hostname. */
+ p = strchr(pathname_local + 1, '\\');
+ if (p == NULL) {
+ DBG_ERR("can't parse hostname from path %s\n",
+ pathname_local);
+ status = NT_STATUS_NOT_FOUND;
+ goto out;
+ }
+ *p = '\0';
+ hostname = &pathname_local[1];
+
+ DBG_DEBUG("hostname: %s\n", hostname);
+
+ /* Is this really our hostname ? */
+ my_hostname = is_myname_or_ipaddr(hostname);
+ if (!my_hostname) {
+ DBG_ERR("Hostname %s is not ours.\n",
+ hostname);
+ status = NT_STATUS_NOT_FOUND;
+ goto out;
+ }
+
+ servicename = p + 1;
+
+ /*
+ * Find the end of servicename by looking for
+ * a directory separator character. The character
+ * should be '\\' for a Windows path.
+ * If there is no separator, then this is a self-referral
+ * of "\server\share".
+ */
+
+ p = strchr(servicename, '\\');
+ if (p != NULL) {
+ *p = '\0';
+ }
+
+ DBG_DEBUG("servicename: %s\n", servicename);
+
+ if (p == NULL) {
+ /* Client sent self referral "\server\share". */
+ reqpath = "";
+ } else {
+ /* Step past the '\0' we just replaced '\\' with. */
+ reqpath = p + 1;
+ }
+
+ DBG_DEBUG("rest of the path: %s\n", reqpath);
+
+ if (_hostname != NULL) {
+ *_hostname = talloc_strdup(ctx, hostname);
+ if (*_hostname == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto out;
+ }
+ }
+ if (_servicename != NULL) {
+ *_servicename = talloc_strdup(ctx, servicename);
+ if (*_servicename == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto out;
+ }
+ }
+ if (_remaining_path != NULL) {
+ *_remaining_path = talloc_strdup(ctx, reqpath);
+ if (*_remaining_path == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto out;
+ }
+ }
+
+ status = NT_STATUS_OK;
+out:
+ TALLOC_FREE(pathname_local);
+ return status;
+}
+
+/********************************************************
+ Fake up a connection struct for the VFS layer, for use in
+ applications (such as the python bindings), that do not want the
+ global working directory changed under them.
+
+ SMB_VFS_CONNECT requires root privileges.
+*********************************************************/
+
+static NTSTATUS create_conn_struct_as_root(TALLOC_CTX *ctx,
+ struct tevent_context *ev,
+ struct messaging_context *msg,
+ connection_struct **pconn,
+ int snum,
+ const char *path,
+ const struct auth_session_info *session_info)
+{
+ connection_struct *conn;
+ char *connpath;
+ const char *vfs_user;
+ struct smbd_server_connection *sconn;
+ const char *servicename = lp_const_servicename(snum);
+ bool ok;
+
+ sconn = talloc_zero(ctx, struct smbd_server_connection);
+ if (sconn == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ sconn->ev_ctx = ev;
+ sconn->msg_ctx = msg;
+
+ conn = conn_new(sconn);
+ if (conn == NULL) {
+ TALLOC_FREE(sconn);
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ /* Now we have conn, we need to make sconn a child of conn,
+ * for a proper talloc tree */
+ talloc_steal(conn, sconn);
+
+ if (snum == -1 && servicename == NULL) {
+ servicename = "Unknown Service (snum == -1)";
+ }
+
+ connpath = talloc_strdup(conn, path);
+ if (!connpath) {
+ TALLOC_FREE(conn);
+ return NT_STATUS_NO_MEMORY;
+ }
+ connpath = talloc_string_sub(conn,
+ connpath,
+ "%S",
+ servicename);
+ if (!connpath) {
+ TALLOC_FREE(conn);
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ /* needed for smbd_vfs_init() */
+
+ conn->params->service = snum;
+ conn->cnum = TID_FIELD_INVALID;
+
+ SMB_ASSERT(session_info != NULL);
+
+ conn->session_info = copy_session_info(conn, session_info);
+ if (conn->session_info == NULL) {
+ DBG_ERR("copy_serverinfo failed\n");
+ TALLOC_FREE(conn);
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ /* unix_info could be NULL in session_info */
+ if (conn->session_info->unix_info != NULL) {
+ vfs_user = conn->session_info->unix_info->unix_name;
+ } else {
+ vfs_user = get_current_username();
+ }
+
+ conn_setup_case_options(conn);
+
+ set_conn_connectpath(conn, connpath);
+
+ /*
+ * New code to check if there's a share security descriptor
+ * added from NT server manager. This is done after the
+ * smb.conf checks are done as we need a uid and token. JRA.
+ *
+ */
+ share_access_check(conn->session_info->security_token,
+ servicename,
+ MAXIMUM_ALLOWED_ACCESS,
+ &conn->share_access);
+
+ if ((conn->share_access & FILE_WRITE_DATA) == 0) {
+ if ((conn->share_access & FILE_READ_DATA) == 0) {
+ /* No access, read or write. */
+ DBG_WARNING("connection to %s "
+ "denied due to security "
+ "descriptor.\n",
+ servicename);
+ conn_free(conn);
+ return NT_STATUS_ACCESS_DENIED;
+ }
+ conn->read_only = true;
+ }
+
+ if (!smbd_vfs_init(conn)) {
+ NTSTATUS status = map_nt_error_from_unix(errno);
+ DEBUG(0,("create_conn_struct: smbd_vfs_init failed.\n"));
+ conn_free(conn);
+ return status;
+ }
+
+ /* this must be the first filesystem operation that we do */
+ if (SMB_VFS_CONNECT(conn, servicename, vfs_user) < 0) {
+ DEBUG(0,("VFS connect failed!\n"));
+ conn_free(conn);
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+
+ ok = canonicalize_connect_path(conn);
+ if (!ok) {
+ DBG_ERR("Failed to canonicalize sharepath\n");
+ conn_free(conn);
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
+ conn->tcon_done = true;
+ *pconn = talloc_move(ctx, &conn);
+
+ return NT_STATUS_OK;
+}
+
+static int conn_struct_tos_destructor(struct conn_struct_tos *c)
+{
+ if (c->oldcwd_fname != NULL) {
+ vfs_ChDir(c->conn, c->oldcwd_fname);
+ TALLOC_FREE(c->oldcwd_fname);
+ }
+ SMB_VFS_DISCONNECT(c->conn);
+ conn_free(c->conn);
+ return 0;
+}
+
+/********************************************************
+ Fake up a connection struct for the VFS layer, for use in
+ applications (such as the python bindings), that do not want the
+ global working directory changed under them.
+
+ SMB_VFS_CONNECT requires root privileges.
+ This temporary uses become_root() and unbecome_root().
+
+ But further impersonation has to be cone by the caller.
+*********************************************************/
+NTSTATUS create_conn_struct_tos(struct messaging_context *msg,
+ int snum,
+ const char *path,
+ const struct auth_session_info *session_info,
+ struct conn_struct_tos **_c)
+{
+ struct conn_struct_tos *c = NULL;
+ struct tevent_context *ev = NULL;
+ NTSTATUS status;
+
+ *_c = NULL;
+
+ c = talloc_zero(talloc_tos(), struct conn_struct_tos);
+ if (c == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ ev = samba_tevent_context_init(c);
+ if (ev == NULL) {
+ TALLOC_FREE(c);
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ become_root();
+ status = create_conn_struct_as_root(c,
+ ev,
+ msg,
+ &c->conn,
+ snum,
+ path,
+ session_info);
+ unbecome_root();
+ if (!NT_STATUS_IS_OK(status)) {
+ TALLOC_FREE(c);
+ return status;
+ }
+
+ talloc_set_destructor(c, conn_struct_tos_destructor);
+
+ *_c = c;
+ return NT_STATUS_OK;
+}
+
+/********************************************************
+ Fake up a connection struct for the VFS layer.
+ Note: this performs a vfs connect and CHANGES CWD !!!! JRA.
+
+ See also the comment for create_conn_struct_tos() above!
+
+ The CWD change is reverted by the destructor of
+ conn_struct_tos when the current talloc_tos() is destroyed.
+*********************************************************/
+NTSTATUS create_conn_struct_tos_cwd(struct messaging_context *msg,
+ int snum,
+ const char *path,
+ const struct auth_session_info *session_info,
+ struct conn_struct_tos **_c)
+{
+ struct conn_struct_tos *c = NULL;
+ struct smb_filename smb_fname_connectpath = {0};
+ NTSTATUS status;
+
+ *_c = NULL;
+
+ status = create_conn_struct_tos(msg,
+ snum,
+ path,
+ session_info,
+ &c);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ /*
+ * Windows seems to insist on doing trans2getdfsreferral() calls on
+ * the IPC$ share as the anonymous user. If we try to chdir as that
+ * user we will fail.... WTF ? JRA.
+ */
+
+ c->oldcwd_fname = vfs_GetWd(c, c->conn);
+ if (c->oldcwd_fname == NULL) {
+ status = map_nt_error_from_unix(errno);
+ DEBUG(3, ("vfs_GetWd failed: %s\n", strerror(errno)));
+ TALLOC_FREE(c);
+ return status;
+ }
+
+ smb_fname_connectpath = (struct smb_filename) {
+ .base_name = c->conn->connectpath
+ };
+
+ if (vfs_ChDir(c->conn, &smb_fname_connectpath) != 0) {
+ status = map_nt_error_from_unix(errno);
+ DBG_NOTICE("Can't ChDir to new conn path %s. "
+ "Error was %s\n",
+ c->conn->connectpath, strerror(errno));
+ TALLOC_FREE(c->oldcwd_fname);
+ TALLOC_FREE(c);
+ return status;
+ }
+
+ *_c = c;
+ return NT_STATUS_OK;
+}
+
+/********************************************************
+ Fake up a connection struct for the VFS layer.
+ This takes an TALLOC_CTX and tevent_context from the
+ caller and the resulting connection_struct is stable
+ across the lifetime of mem_ctx and ev.
+
+ Note: this performs a vfs connect and changes cwd.
+
+ See also the comment for create_conn_struct_tos() above!
+*********************************************************/
+
+NTSTATUS create_conn_struct_cwd(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ struct messaging_context *msg,
+ const struct auth_session_info *session_info,
+ int snum,
+ const char *path,
+ struct connection_struct **c)
+{
+ NTSTATUS status;
+
+ become_root();
+ status = create_conn_struct_as_root(mem_ctx,
+ ev,
+ msg,
+ c,
+ snum,
+ path,
+ session_info);
+ unbecome_root();
+ return status;
+}
+
+static void shuffle_strlist(char **list, int count)
+{
+ int i;
+ uint32_t r;
+ char *tmp;
+
+ for (i = count; i > 1; i--) {
+ r = generate_random() % i;
+
+ tmp = list[i-1];
+ list[i-1] = list[r];
+ list[r] = tmp;
+ }
+}
+
+/**********************************************************************
+ Parse the contents of a symlink to verify if it is an msdfs referral
+ A valid referral is of the form:
+
+ msdfs:server1\share1,server2\share2
+ msdfs:server1\share1\pathname,server2\share2\pathname
+ msdfs:server1/share1,server2/share2
+ msdfs:server1/share1/pathname,server2/share2/pathname.
+
+ Note that the alternate paths returned here must be of the canonicalized
+ form:
+
+ \server\share or
+ \server\share\path\to\file,
+
+ even in posix path mode. This is because we have no knowledge if the
+ server we're referring to understands posix paths.
+ **********************************************************************/
+
+bool parse_msdfs_symlink(TALLOC_CTX *ctx,
+ bool shuffle_referrals,
+ const char *target,
+ struct referral **ppreflist,
+ size_t *prefcount)
+{
+ char *temp = NULL;
+ char *prot;
+ char **alt_path = NULL;
+ size_t count = 0, i;
+ struct referral *reflist = NULL;
+ char *saveptr;
+
+ temp = talloc_strdup(ctx, target);
+ if (!temp) {
+ return false;
+ }
+ prot = strtok_r(temp, ":", &saveptr);
+ if (!prot) {
+ DEBUG(0,("parse_msdfs_symlink: invalid path !\n"));
+ TALLOC_FREE(temp);
+ return false;
+ }
+
+ alt_path = talloc_array(ctx, char *, MAX_REFERRAL_COUNT);
+ if (!alt_path) {
+ TALLOC_FREE(temp);
+ return false;
+ }
+
+ /* parse out the alternate paths */
+ while((count<MAX_REFERRAL_COUNT) &&
+ ((alt_path[count] = strtok_r(NULL, ",", &saveptr)) != NULL)) {
+ count++;
+ }
+
+ /* shuffle alternate paths */
+ if (shuffle_referrals) {
+ shuffle_strlist(alt_path, count);
+ }
+
+ DBG_DEBUG("count=%zu\n", count);
+
+ if (count) {
+ reflist = talloc_zero_array(ctx,
+ struct referral, count);
+ if(reflist == NULL) {
+ TALLOC_FREE(temp);
+ TALLOC_FREE(alt_path);
+ return false;
+ }
+ } else {
+ reflist = NULL;
+ }
+
+ for(i=0;i<count;i++) {
+ char *p;
+
+ /* Canonicalize link target.
+ * Replace all /'s in the path by a \ */
+ string_replace(alt_path[i], '/', '\\');
+
+ /* Remove leading '\\'s */
+ p = alt_path[i];
+ while (*p && (*p == '\\')) {
+ p++;
+ }
+
+ reflist[i].alternate_path = talloc_asprintf(reflist,
+ "\\%s",
+ p);
+ if (!reflist[i].alternate_path) {
+ TALLOC_FREE(temp);
+ TALLOC_FREE(alt_path);
+ TALLOC_FREE(reflist);
+ return false;
+ }
+
+ reflist[i].proximity = 0;
+ reflist[i].ttl = REFERRAL_TTL;
+ DBG_DEBUG("Created alt path: %s\n",
+ reflist[i].alternate_path);
+ }
+
+ if (ppreflist != NULL) {
+ *ppreflist = reflist;
+ } else {
+ TALLOC_FREE(reflist);
+ }
+ if (prefcount != NULL) {
+ *prefcount = count;
+ }
+ TALLOC_FREE(temp);
+ TALLOC_FREE(alt_path);
+ return true;
+}
+
+/**********************************************************************
+ Returns true if the unix path is a valid msdfs symlink.
+**********************************************************************/
+
+bool is_msdfs_link(struct files_struct *dirfsp,
+ struct smb_filename *atname)
+{
+ NTSTATUS status = SMB_VFS_READ_DFS_PATHAT(dirfsp->conn,
+ talloc_tos(),
+ dirfsp,
+ atname,
+ NULL,
+ NULL);
+ return (NT_STATUS_IS_OK(status));
+}
+
+/*****************************************************************
+ Used by other functions to decide if a dfs path is remote,
+ and to get the list of referred locations for that remote path.
+
+ consumedcntp: how much of the dfs path is being redirected. the client
+ should try the remaining path on the redirected server.
+*****************************************************************/
+
+static NTSTATUS dfs_path_lookup(TALLOC_CTX *ctx,
+ connection_struct *conn,
+ const char *dfspath, /* Incoming complete dfs path */
+ const char *reqpath, /* Parsed out remaining path. */
+ uint32_t ucf_flags,
+ size_t *consumedcntp,
+ struct referral **ppreflist,
+ size_t *preferral_count)
+{
+ NTSTATUS status;
+ struct smb_filename *parent_smb_fname = NULL;
+ struct smb_filename *smb_fname_rel = NULL;
+ NTTIME twrp = 0;
+ char *local_pathname = NULL;
+ char *last_component = NULL;
+ char *atname = NULL;
+ size_t removed_components = 0;
+ bool posix = (ucf_flags & UCF_POSIX_PATHNAMES);
+ char *p = NULL;
+ char *canon_dfspath = NULL;
+
+ DBG_DEBUG("Conn path = %s reqpath = %s\n", conn->connectpath, reqpath);
+
+ local_pathname = talloc_strdup(ctx, reqpath);
+ if (local_pathname == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto out;
+ }
+
+ /* We know reqpath isn't a DFS path. */
+ ucf_flags &= ~UCF_DFS_PATHNAME;
+
+ if (ucf_flags & UCF_GMT_PATHNAME) {
+ extract_snapshot_token(local_pathname, &twrp);
+ ucf_flags &= ~UCF_GMT_PATHNAME;
+ }
+
+ /*
+ * We should have been given a DFS path to resolve.
+ * This should return NT_STATUS_PATH_NOT_COVERED.
+ *
+ * Do a pathname walk, stripping off components
+ * until we get NT_STATUS_OK instead of
+ * NT_STATUS_PATH_NOT_COVERED.
+ *
+ * Fail on any other error.
+ */
+
+ for (;;) {
+ TALLOC_CTX *frame = NULL;
+ struct files_struct *dirfsp = NULL;
+ struct smb_filename *smb_fname_walk = NULL;
+
+ TALLOC_FREE(parent_smb_fname);
+
+ /*
+ * Use a local stackframe as filename_convert_dirfsp()
+ * opens handles on the last two components in the path.
+ * Allow these to be freed as we step back through
+ * the local_pathname.
+ */
+ frame = talloc_stackframe();
+ status = filename_convert_dirfsp(frame,
+ conn,
+ local_pathname,
+ ucf_flags,
+ twrp,
+ &dirfsp,
+ &smb_fname_walk);
+ /* If we got a name, save it. */
+ if (smb_fname_walk != NULL) {
+ parent_smb_fname = talloc_move(ctx, &smb_fname_walk);
+ }
+ TALLOC_FREE(frame);
+
+ if (!NT_STATUS_EQUAL(status, NT_STATUS_PATH_NOT_COVERED)) {
+ /*
+ * For any other status than NT_STATUS_PATH_NOT_COVERED
+ * (including NT_STATUS_OK) we exit the walk.
+ * If it's an error we catch it outside the loop.
+ */
+ break;
+ }
+
+ /* Step back one component and save it off as last_component. */
+ TALLOC_FREE(last_component);
+ p = strrchr(local_pathname, '/');
+ if (p == NULL) {
+ /*
+ * We removed all components.
+ * Go around once more to make
+ * sure we can open the root '\0'.
+ */
+ last_component = talloc_strdup(ctx, local_pathname);
+ *local_pathname = '\0';
+ } else {
+ last_component = talloc_strdup(ctx, p+1);
+ *p = '\0';
+ }
+ if (last_component == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto out;
+ }
+ /* Integer wrap check. */
+ if (removed_components + 1 < removed_components) {
+ status = NT_STATUS_INVALID_PARAMETER;
+ goto out;
+ }
+ removed_components++;
+ }
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_DEBUG("dfspath = %s. reqpath = %s. Error %s.\n",
+ dfspath,
+ reqpath,
+ nt_errstr(status));
+ goto out;
+ }
+
+ if (parent_smb_fname->fsp == NULL) {
+ /* Unable to open parent. */
+ DBG_DEBUG("dfspath = %s. reqpath = %s. "
+ "Unable to open parent directory (%s).\n",
+ dfspath,
+ reqpath,
+ smb_fname_str_dbg(parent_smb_fname));
+ status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
+ goto out;
+ }
+
+ if (removed_components == 0) {
+ /*
+ * We never got NT_STATUS_PATH_NOT_COVERED.
+ * There was no DFS redirect.
+ */
+ DBG_DEBUG("dfspath = %s. reqpath = %s. "
+ "No removed components.\n",
+ dfspath,
+ reqpath);
+ status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
+ goto out;
+ }
+
+ /*
+ * One of the removed_components was the MSDFS link
+ * at the end. We need to count this in the resolved
+ * path below, so remove one from removed_components.
+ */
+ removed_components--;
+
+ /*
+ * Now parent_smb_fname->fsp is the parent directory dirfsp,
+ * last_component is the untranslated MS-DFS link name.
+ * Search for it in the parent directory to get the real
+ * filename on disk.
+ */
+ status = get_real_filename_at(parent_smb_fname->fsp,
+ last_component,
+ ctx,
+ &atname);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_DEBUG("dfspath = %s. reqpath = %s "
+ "get_real_filename_at(%s, %s) error (%s)\n",
+ dfspath,
+ reqpath,
+ smb_fname_str_dbg(parent_smb_fname),
+ last_component,
+ nt_errstr(status));
+ goto out;
+ }
+
+ smb_fname_rel = synthetic_smb_fname(ctx,
+ atname,
+ NULL,
+ NULL,
+ twrp,
+ posix ? SMB_FILENAME_POSIX_PATH : 0);
+ if (smb_fname_rel == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto out;
+ }
+
+ /* Get the referral to return. */
+ status = SMB_VFS_READ_DFS_PATHAT(conn,
+ ctx,
+ parent_smb_fname->fsp,
+ smb_fname_rel,
+ ppreflist,
+ preferral_count);
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_DEBUG("dfspath = %s. reqpath = %s. "
+ "SMB_VFS_READ_DFS_PATHAT(%s, %s) error (%s)\n",
+ dfspath,
+ reqpath,
+ smb_fname_str_dbg(parent_smb_fname),
+ smb_fname_str_dbg(smb_fname_rel),
+ nt_errstr(status));
+ goto out;
+ }
+
+ /*
+ * Now we must work out how much of the
+ * given pathname we consumed.
+ */
+ canon_dfspath = talloc_strdup(ctx, dfspath);
+ if (!canon_dfspath) {
+ status = NT_STATUS_NO_MEMORY;
+ goto out;
+ }
+ /* Canonicalize the raw dfspath. */
+ string_replace(canon_dfspath, '\\', '/');
+
+ /*
+ * reqpath comes out of parse_dfs_path(), so it has
+ * no trailing backslash. Make sure that canon_dfspath hasn't either.
+ */
+ trim_char(canon_dfspath, 0, '/');
+
+ DBG_DEBUG("Unconsumed path: %s\n", canon_dfspath);
+
+ while (removed_components > 0) {
+ p = strrchr(canon_dfspath, '/');
+ if (p != NULL) {
+ *p = '\0';
+ }
+ removed_components--;
+ if (p == NULL && removed_components != 0) {
+ DBG_ERR("Component mismatch. path = %s, "
+ "%zu components left\n",
+ canon_dfspath,
+ removed_components);
+ status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
+ goto out;
+ }
+ }
+ *consumedcntp = strlen(canon_dfspath);
+ DBG_DEBUG("Path consumed: %s (%zu)\n", canon_dfspath, *consumedcntp);
+ status = NT_STATUS_OK;
+
+ out:
+
+ TALLOC_FREE(parent_smb_fname);
+ TALLOC_FREE(local_pathname);
+ TALLOC_FREE(last_component);
+ TALLOC_FREE(atname);
+ TALLOC_FREE(smb_fname_rel);
+ TALLOC_FREE(canon_dfspath);
+ return status;
+}
+
+/**********************************************************************
+ Return a self referral.
+**********************************************************************/
+
+static NTSTATUS self_ref(TALLOC_CTX *ctx,
+ const char *dfs_path,
+ struct junction_map *jucn,
+ size_t *consumedcntp,
+ bool *self_referralp)
+{
+ struct referral *ref;
+
+ *self_referralp = True;
+
+ jucn->referral_count = 1;
+ if((ref = talloc_zero(ctx, struct referral)) == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ ref->alternate_path = talloc_strdup(ctx, dfs_path);
+ if (!ref->alternate_path) {
+ TALLOC_FREE(ref);
+ return NT_STATUS_NO_MEMORY;
+ }
+ ref->proximity = 0;
+ ref->ttl = REFERRAL_TTL;
+ jucn->referral_list = ref;
+ *consumedcntp = strlen(dfs_path);
+ return NT_STATUS_OK;
+}
+
+/**********************************************************************
+ Gets valid referrals for a dfs path and fills up the
+ junction_map structure.
+**********************************************************************/
+
+NTSTATUS get_referred_path(TALLOC_CTX *ctx,
+ struct auth_session_info *session_info,
+ const char *dfs_path,
+ const struct tsocket_address *remote_address,
+ const struct tsocket_address *local_address,
+ struct junction_map *jucn,
+ size_t *consumedcntp,
+ bool *self_referralp)
+{
+ TALLOC_CTX *frame = talloc_stackframe();
+ const struct loadparm_substitution *lp_sub =
+ loadparm_s3_global_substitution();
+ struct conn_struct_tos *c = NULL;
+ struct connection_struct *conn = NULL;
+ char *servicename = NULL;
+ char *reqpath = NULL;
+ int snum;
+ NTSTATUS status = NT_STATUS_NOT_FOUND;
+
+ *self_referralp = False;
+
+ status = parse_dfs_path_strict(
+ frame,
+ dfs_path,
+ NULL, /* hostname */
+ &servicename,
+ &reqpath);
+ if (!NT_STATUS_IS_OK(status)) {
+ TALLOC_FREE(frame);
+ return status;
+ }
+
+ /* Path referrals are always non-POSIX. */
+ status = check_path_syntax(reqpath, false);
+ if (!NT_STATUS_IS_OK(status)) {
+ TALLOC_FREE(frame);
+ return status;
+ }
+
+ jucn->service_name = talloc_strdup(ctx, servicename);
+ jucn->volume_name = talloc_strdup(ctx, reqpath);
+ if (!jucn->service_name || !jucn->volume_name) {
+ TALLOC_FREE(frame);
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ /* Verify the share is a dfs root */
+ snum = lp_servicenumber(jucn->service_name);
+ if(snum < 0) {
+ char *service_name = NULL;
+ if ((snum = find_service(ctx, jucn->service_name, &service_name)) < 0) {
+ TALLOC_FREE(frame);
+ return NT_STATUS_NOT_FOUND;
+ }
+ if (!service_name) {
+ TALLOC_FREE(frame);
+ return NT_STATUS_NO_MEMORY;
+ }
+ TALLOC_FREE(jucn->service_name);
+ jucn->service_name = talloc_strdup(ctx, service_name);
+ if (!jucn->service_name) {
+ TALLOC_FREE(frame);
+ return NT_STATUS_NO_MEMORY;
+ }
+ }
+
+ if (!lp_msdfs_root(snum) && (*lp_msdfs_proxy(talloc_tos(), lp_sub, snum) == '\0')) {
+ DEBUG(3,("get_referred_path: |%s| in dfs path %s is not "
+ "a dfs root.\n",
+ servicename, dfs_path));
+ TALLOC_FREE(frame);
+ return NT_STATUS_NOT_FOUND;
+ }
+
+ /*
+ * Self referrals are tested with a anonymous IPC connection and
+ * a GET_DFS_REFERRAL call to \\server\share. (which means
+ * dp.reqpath[0] points to an empty string). create_conn_struct cd's
+ * into the directory and will fail if it cannot (as the anonymous
+ * user). Cope with this.
+ */
+
+ if (reqpath[0] == '\0') {
+ char *tmp;
+ struct referral *ref;
+ size_t refcount;
+
+ if (*lp_msdfs_proxy(talloc_tos(), lp_sub, snum) == '\0') {
+ TALLOC_FREE(frame);
+ return self_ref(ctx,
+ dfs_path,
+ jucn,
+ consumedcntp,
+ self_referralp);
+ }
+
+ /*
+ * It's an msdfs proxy share. Redirect to
+ * the configured target share.
+ */
+
+ tmp = talloc_asprintf(frame, "msdfs:%s",
+ lp_msdfs_proxy(frame, lp_sub, snum));
+ if (tmp == NULL) {
+ TALLOC_FREE(frame);
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ if (!parse_msdfs_symlink(ctx,
+ lp_msdfs_shuffle_referrals(snum),
+ tmp,
+ &ref,
+ &refcount)) {
+ TALLOC_FREE(frame);
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+ jucn->referral_count = refcount;
+ jucn->referral_list = ref;
+ *consumedcntp = strlen(dfs_path);
+ TALLOC_FREE(frame);
+ return NT_STATUS_OK;
+ }
+
+ status = create_conn_struct_tos_cwd(global_messaging_context(),
+ snum,
+ lp_path(frame, lp_sub, snum),
+ session_info,
+ &c);
+ if (!NT_STATUS_IS_OK(status)) {
+ TALLOC_FREE(frame);
+ return status;
+ }
+ conn = c->conn;
+
+ /*
+ * TODO
+ *
+ * The remote and local address should be passed down to
+ * create_conn_struct_cwd.
+ */
+ if (conn->sconn->remote_address == NULL) {
+ conn->sconn->remote_address =
+ tsocket_address_copy(remote_address, conn->sconn);
+ if (conn->sconn->remote_address == NULL) {
+ TALLOC_FREE(frame);
+ return NT_STATUS_NO_MEMORY;
+ }
+ }
+ if (conn->sconn->local_address == NULL) {
+ conn->sconn->local_address =
+ tsocket_address_copy(local_address, conn->sconn);
+ if (conn->sconn->local_address == NULL) {
+ TALLOC_FREE(frame);
+ return NT_STATUS_NO_MEMORY;
+ }
+ }
+
+ status = dfs_path_lookup(ctx,
+ conn,
+ dfs_path,
+ reqpath,
+ 0, /* ucf_flags */
+ consumedcntp,
+ &jucn->referral_list,
+ &jucn->referral_count);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_NOTICE("No valid referrals for path %s (%s)\n",
+ dfs_path,
+ nt_errstr(status));
+ }
+
+ TALLOC_FREE(frame);
+ return status;
+}
+
+/******************************************************************
+ Set up the DFS referral for the dfs pathname. This call returns
+ the amount of the path covered by this server, and where the
+ client should be redirected to. This is the meat of the
+ TRANS2_GET_DFS_REFERRAL call.
+******************************************************************/
+
+int setup_dfs_referral(connection_struct *orig_conn,
+ const char *dfs_path,
+ int max_referral_level,
+ char **ppdata, NTSTATUS *pstatus)
+{
+ char *pdata = *ppdata;
+ int reply_size = 0;
+ struct dfs_GetDFSReferral *r;
+ DATA_BLOB blob = data_blob_null;
+ NTSTATUS status;
+ enum ndr_err_code ndr_err;
+
+ r = talloc_zero(talloc_tos(), struct dfs_GetDFSReferral);
+ if (r == NULL) {
+ *pstatus = NT_STATUS_NO_MEMORY;
+ return -1;
+ }
+
+ r->in.req.max_referral_level = max_referral_level;
+ r->in.req.servername = talloc_strdup(r, dfs_path);
+ if (r->in.req.servername == NULL) {
+ talloc_free(r);
+ *pstatus = NT_STATUS_NO_MEMORY;
+ return -1;
+ }
+
+ status = SMB_VFS_GET_DFS_REFERRALS(orig_conn, r);
+ if (!NT_STATUS_IS_OK(status)) {
+ talloc_free(r);
+ *pstatus = status;
+ return -1;
+ }
+
+ ndr_err = ndr_push_struct_blob(&blob, r,
+ r->out.resp,
+ (ndr_push_flags_fn_t)ndr_push_dfs_referral_resp);
+ if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+ TALLOC_FREE(r);
+ *pstatus = NT_STATUS_INVALID_PARAMETER;
+ return -1;
+ }
+
+ pdata = (char *)SMB_REALLOC(pdata, blob.length);
+ if(pdata == NULL) {
+ TALLOC_FREE(r);
+ DEBUG(0,("referral setup:"
+ "malloc failed for Realloc!\n"));
+ return -1;
+ }
+ *ppdata = pdata;
+ reply_size = blob.length;
+ memcpy(pdata, blob.data, blob.length);
+ TALLOC_FREE(r);
+
+ *pstatus = NT_STATUS_OK;
+ return reply_size;
+}
+
+/**********************************************************************
+ The following functions are called by the NETDFS RPC pipe functions
+ **********************************************************************/
+
+/*********************************************************************
+ Creates a junction structure from a DFS pathname
+**********************************************************************/
+
+bool create_junction(TALLOC_CTX *ctx,
+ const char *dfs_path,
+ struct junction_map *jucn)
+{
+ const struct loadparm_substitution *lp_sub =
+ loadparm_s3_global_substitution();
+ int snum;
+ char *servicename = NULL;
+ char *reqpath = NULL;
+ NTSTATUS status;
+
+ status = parse_dfs_path_strict(
+ ctx,
+ dfs_path,
+ NULL,
+ &servicename,
+ &reqpath);
+ if (!NT_STATUS_IS_OK(status)) {
+ return False;
+ }
+
+ /* Check for a non-DFS share */
+ snum = lp_servicenumber(servicename);
+
+ if(snum < 0 || !lp_msdfs_root(snum)) {
+ DEBUG(4,("create_junction: %s is not an msdfs root.\n",
+ servicename));
+ return False;
+ }
+
+ /* Junction create paths are always non-POSIX. */
+ status = check_path_syntax(reqpath, false);
+ if (!NT_STATUS_IS_OK(status)) {
+ return false;
+ }
+
+ jucn->service_name = talloc_strdup(ctx, servicename);
+ jucn->volume_name = talloc_strdup(ctx, reqpath);
+ jucn->comment = lp_comment(ctx, lp_sub, snum);
+
+ if (!jucn->service_name || !jucn->volume_name || ! jucn->comment) {
+ return False;
+ }
+ return True;
+}
+
+/**********************************************************************
+ Forms a valid Unix pathname from the junction
+ **********************************************************************/
+
+static bool junction_to_local_path_tos(const struct junction_map *jucn,
+ struct auth_session_info *session_info,
+ char **pp_path_out,
+ connection_struct **conn_out)
+{
+ const struct loadparm_substitution *lp_sub =
+ loadparm_s3_global_substitution();
+ struct conn_struct_tos *c = NULL;
+ int snum;
+ char *path_out = NULL;
+ NTSTATUS status;
+
+ snum = lp_servicenumber(jucn->service_name);
+ if(snum < 0) {
+ return False;
+ }
+ status = create_conn_struct_tos_cwd(global_messaging_context(),
+ snum,
+ lp_path(talloc_tos(), lp_sub, snum),
+ session_info,
+ &c);
+ if (!NT_STATUS_IS_OK(status)) {
+ return False;
+ }
+
+ path_out = talloc_asprintf(c,
+ "%s/%s",
+ lp_path(talloc_tos(), lp_sub, snum),
+ jucn->volume_name);
+ if (path_out == NULL) {
+ TALLOC_FREE(c);
+ return False;
+ }
+ *pp_path_out = path_out;
+ *conn_out = c->conn;
+ return True;
+}
+
+/*
+ * Create a msdfs string in Samba format we can store
+ * in a filesystem object (currently a symlink).
+ */
+
+char *msdfs_link_string(TALLOC_CTX *ctx,
+ const struct referral *reflist,
+ size_t referral_count)
+{
+ char *refpath = NULL;
+ bool insert_comma = false;
+ char *msdfs_link = NULL;
+ size_t i;
+
+ /* Form the msdfs_link contents */
+ msdfs_link = talloc_strdup(ctx, "msdfs:");
+ if (msdfs_link == NULL) {
+ goto err;
+ }
+
+ for( i= 0; i < referral_count; i++) {
+ refpath = talloc_strdup(ctx, reflist[i].alternate_path);
+
+ if (refpath == NULL) {
+ goto err;
+ }
+
+ /* Alternate paths always use Windows separators. */
+ trim_char(refpath, '\\', '\\');
+ if (*refpath == '\0') {
+ if (i == 0) {
+ insert_comma = false;
+ }
+ continue;
+ }
+ if (i > 0 && insert_comma) {
+ msdfs_link = talloc_asprintf_append_buffer(msdfs_link,
+ ",%s",
+ refpath);
+ } else {
+ msdfs_link = talloc_asprintf_append_buffer(msdfs_link,
+ "%s",
+ refpath);
+ }
+
+ if (msdfs_link == NULL) {
+ goto err;
+ }
+
+ if (!insert_comma) {
+ insert_comma = true;
+ }
+
+ TALLOC_FREE(refpath);
+ }
+
+ return msdfs_link;
+
+ err:
+
+ TALLOC_FREE(refpath);
+ TALLOC_FREE(msdfs_link);
+ return NULL;
+}
+
+bool create_msdfs_link(const struct junction_map *jucn,
+ struct auth_session_info *session_info)
+{
+ TALLOC_CTX *frame = talloc_stackframe();
+ char *path = NULL;
+ connection_struct *conn;
+ struct smb_filename *smb_fname = NULL;
+ struct smb_filename *parent_fname = NULL;
+ struct smb_filename *at_fname = NULL;
+ bool ok;
+ NTSTATUS status;
+ bool ret = false;
+
+ ok = junction_to_local_path_tos(jucn, session_info, &path, &conn);
+ if (!ok) {
+ goto out;
+ }
+
+ if (!CAN_WRITE(conn)) {
+ const struct loadparm_substitution *lp_sub =
+ loadparm_s3_global_substitution();
+ int snum = lp_servicenumber(jucn->service_name);
+
+ DBG_WARNING("Can't create DFS entry on read-only share %s\n",
+ lp_servicename(frame, lp_sub, snum));
+ goto out;
+ }
+
+ smb_fname = synthetic_smb_fname(frame,
+ path,
+ NULL,
+ NULL,
+ 0,
+ 0);
+ if (smb_fname == NULL) {
+ goto out;
+ }
+
+ status = parent_pathref(frame,
+ conn->cwd_fsp,
+ smb_fname,
+ &parent_fname,
+ &at_fname);
+ if (!NT_STATUS_IS_OK(status)) {
+ goto out;
+ }
+
+ status = SMB_VFS_CREATE_DFS_PATHAT(conn,
+ parent_fname->fsp,
+ at_fname,
+ jucn->referral_list,
+ jucn->referral_count);
+ if (!NT_STATUS_IS_OK(status)) {
+ if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_COLLISION)) {
+ int retval = SMB_VFS_UNLINKAT(conn,
+ parent_fname->fsp,
+ at_fname,
+ 0);
+ if (retval != 0) {
+ goto out;
+ }
+ }
+ status = SMB_VFS_CREATE_DFS_PATHAT(conn,
+ parent_fname->fsp,
+ at_fname,
+ jucn->referral_list,
+ jucn->referral_count);
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_WARNING("SMB_VFS_CREATE_DFS_PATHAT failed "
+ "%s - Error: %s\n",
+ path,
+ nt_errstr(status));
+ goto out;
+ }
+ }
+
+ ret = true;
+
+out:
+ TALLOC_FREE(frame);
+ return ret;
+}
+
+bool remove_msdfs_link(const struct junction_map *jucn,
+ struct auth_session_info *session_info)
+{
+ TALLOC_CTX *frame = talloc_stackframe();
+ char *path = NULL;
+ connection_struct *conn;
+ bool ret = False;
+ struct smb_filename *smb_fname;
+ struct smb_filename *parent_fname = NULL;
+ struct smb_filename *at_fname = NULL;
+ NTSTATUS status;
+ bool ok;
+ int retval;
+
+ ok = junction_to_local_path_tos(jucn, session_info, &path, &conn);
+ if (!ok) {
+ TALLOC_FREE(frame);
+ return false;
+ }
+
+ if (!CAN_WRITE(conn)) {
+ const struct loadparm_substitution *lp_sub =
+ loadparm_s3_global_substitution();
+ int snum = lp_servicenumber(jucn->service_name);
+
+ DBG_WARNING("Can't remove DFS entry on read-only share %s\n",
+ lp_servicename(frame, lp_sub, snum));
+ TALLOC_FREE(frame);
+ return false;
+ }
+
+ smb_fname = synthetic_smb_fname(frame,
+ path,
+ NULL,
+ NULL,
+ 0,
+ 0);
+ if (smb_fname == NULL) {
+ TALLOC_FREE(frame);
+ errno = ENOMEM;
+ return false;
+ }
+
+ status = parent_pathref(frame,
+ conn->cwd_fsp,
+ smb_fname,
+ &parent_fname,
+ &at_fname);
+ if (!NT_STATUS_IS_OK(status)) {
+ TALLOC_FREE(frame);
+ return false;
+ }
+
+ retval = SMB_VFS_UNLINKAT(conn,
+ parent_fname->fsp,
+ at_fname,
+ 0);
+ if (retval == 0) {
+ ret = True;
+ }
+
+ TALLOC_FREE(frame);
+ return ret;
+}
+
+/*********************************************************************
+ Return the number of DFS links at the root of this share.
+*********************************************************************/
+
+static size_t count_dfs_links(TALLOC_CTX *ctx,
+ struct auth_session_info *session_info,
+ int snum)
+{
+ TALLOC_CTX *frame = talloc_stackframe();
+ const struct loadparm_substitution *lp_sub =
+ loadparm_s3_global_substitution();
+ size_t cnt = 0;
+ const char *dname = NULL;
+ char *talloced = NULL;
+ const char *connect_path = lp_path(frame, lp_sub, snum);
+ const char *msdfs_proxy = lp_msdfs_proxy(frame, lp_sub, snum);
+ struct conn_struct_tos *c = NULL;
+ connection_struct *conn = NULL;
+ NTSTATUS status;
+ struct smb_filename *smb_fname = NULL;
+ struct smb_Dir *dir_hnd = NULL;
+
+ if(*connect_path == '\0') {
+ TALLOC_FREE(frame);
+ return 0;
+ }
+
+ /*
+ * Fake up a connection struct for the VFS layer.
+ */
+
+ status = create_conn_struct_tos_cwd(global_messaging_context(),
+ snum,
+ connect_path,
+ session_info,
+ &c);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(3, ("create_conn_struct failed: %s\n",
+ nt_errstr(status)));
+ TALLOC_FREE(frame);
+ return 0;
+ }
+ conn = c->conn;
+
+ /* Count a link for the msdfs root - convention */
+ cnt = 1;
+
+ /* No more links if this is an msdfs proxy. */
+ if (*msdfs_proxy != '\0') {
+ goto out;
+ }
+
+ smb_fname = synthetic_smb_fname(frame,
+ ".",
+ NULL,
+ NULL,
+ 0,
+ 0);
+ if (smb_fname == NULL) {
+ goto out;
+ }
+
+ /* Now enumerate all dfs links */
+ status = OpenDir(frame,
+ conn,
+ smb_fname,
+ NULL,
+ 0,
+ &dir_hnd);
+ if (!NT_STATUS_IS_OK(status)) {
+ errno = map_errno_from_nt_status(status);
+ goto out;
+ }
+
+ while ((dname = ReadDirName(dir_hnd, &talloced)) != NULL) {
+ struct smb_filename *smb_dname =
+ synthetic_smb_fname(frame,
+ dname,
+ NULL,
+ NULL,
+ 0,
+ 0);
+ if (smb_dname == NULL) {
+ goto out;
+ }
+ if (is_msdfs_link(dir_hnd_fetch_fsp(dir_hnd), smb_dname)) {
+ if (cnt + 1 < cnt) {
+ cnt = 0;
+ goto out;
+ }
+ cnt++;
+ }
+ TALLOC_FREE(talloced);
+ TALLOC_FREE(smb_dname);
+ }
+
+out:
+ TALLOC_FREE(frame);
+ return cnt;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static int form_junctions(TALLOC_CTX *ctx,
+ struct auth_session_info *session_info,
+ int snum,
+ struct junction_map *jucn,
+ size_t jn_remain)
+{
+ TALLOC_CTX *frame = talloc_stackframe();
+ const struct loadparm_substitution *lp_sub =
+ loadparm_s3_global_substitution();
+ size_t cnt = 0;
+ const char *dname = NULL;
+ char *talloced = NULL;
+ const char *connect_path = lp_path(frame, lp_sub, snum);
+ char *service_name = lp_servicename(frame, lp_sub, snum);
+ const char *msdfs_proxy = lp_msdfs_proxy(frame, lp_sub, snum);
+ struct conn_struct_tos *c = NULL;
+ connection_struct *conn = NULL;
+ struct referral *ref = NULL;
+ struct smb_filename *smb_fname = NULL;
+ struct smb_Dir *dir_hnd = NULL;
+ NTSTATUS status;
+
+ if (jn_remain == 0) {
+ TALLOC_FREE(frame);
+ return 0;
+ }
+
+ if(*connect_path == '\0') {
+ TALLOC_FREE(frame);
+ return 0;
+ }
+
+ /*
+ * Fake up a connection struct for the VFS layer.
+ */
+
+ status = create_conn_struct_tos_cwd(global_messaging_context(),
+ snum,
+ connect_path,
+ session_info,
+ &c);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(3, ("create_conn_struct failed: %s\n",
+ nt_errstr(status)));
+ TALLOC_FREE(frame);
+ return 0;
+ }
+ conn = c->conn;
+
+ /* form a junction for the msdfs root - convention
+ DO NOT REMOVE THIS: NT clients will not work with us
+ if this is not present
+ */
+ jucn[cnt].service_name = talloc_strdup(ctx,service_name);
+ jucn[cnt].volume_name = talloc_strdup(ctx, "");
+ if (!jucn[cnt].service_name || !jucn[cnt].volume_name) {
+ goto out;
+ }
+ jucn[cnt].comment = "";
+ jucn[cnt].referral_count = 1;
+
+ ref = jucn[cnt].referral_list = talloc_zero(ctx, struct referral);
+ if (jucn[cnt].referral_list == NULL) {
+ goto out;
+ }
+
+ ref->proximity = 0;
+ ref->ttl = REFERRAL_TTL;
+ if (*msdfs_proxy != '\0') {
+ ref->alternate_path = talloc_strdup(ctx,
+ msdfs_proxy);
+ } else {
+ ref->alternate_path = talloc_asprintf(ctx,
+ "\\\\%s\\%s",
+ get_local_machine_name(),
+ service_name);
+ }
+
+ if (!ref->alternate_path) {
+ goto out;
+ }
+ cnt++;
+
+ /* Don't enumerate if we're an msdfs proxy. */
+ if (*msdfs_proxy != '\0') {
+ goto out;
+ }
+
+ smb_fname = synthetic_smb_fname(frame,
+ ".",
+ NULL,
+ NULL,
+ 0,
+ 0);
+ if (smb_fname == NULL) {
+ goto out;
+ }
+
+ /* Now enumerate all dfs links */
+ status = OpenDir(frame,
+ conn,
+ smb_fname,
+ NULL,
+ 0,
+ &dir_hnd);
+ if (!NT_STATUS_IS_OK(status)) {
+ errno = map_errno_from_nt_status(status);
+ goto out;
+ }
+
+ while ((dname = ReadDirName(dir_hnd, &talloced)) != NULL) {
+ struct smb_filename *smb_dname = NULL;
+
+ if (cnt >= jn_remain) {
+ DEBUG(2, ("form_junctions: ran out of MSDFS "
+ "junction slots\n"));
+ TALLOC_FREE(talloced);
+ goto out;
+ }
+ smb_dname = synthetic_smb_fname(talloc_tos(),
+ dname,
+ NULL,
+ NULL,
+ 0,
+ 0);
+ if (smb_dname == NULL) {
+ TALLOC_FREE(talloced);
+ goto out;
+ }
+
+ status = SMB_VFS_READ_DFS_PATHAT(conn,
+ ctx,
+ conn->cwd_fsp,
+ smb_dname,
+ &jucn[cnt].referral_list,
+ &jucn[cnt].referral_count);
+
+ if (NT_STATUS_IS_OK(status)) {
+ jucn[cnt].service_name = talloc_strdup(ctx,
+ service_name);
+ jucn[cnt].volume_name = talloc_strdup(ctx, dname);
+ if (!jucn[cnt].service_name || !jucn[cnt].volume_name) {
+ TALLOC_FREE(talloced);
+ goto out;
+ }
+ jucn[cnt].comment = "";
+ cnt++;
+ }
+ TALLOC_FREE(talloced);
+ TALLOC_FREE(smb_dname);
+ }
+
+out:
+ TALLOC_FREE(frame);
+ return cnt;
+}
+
+struct junction_map *enum_msdfs_links(TALLOC_CTX *ctx,
+ struct auth_session_info *session_info,
+ size_t *p_num_jn)
+{
+ struct junction_map *jn = NULL;
+ int i=0;
+ size_t jn_count = 0;
+ int sharecount = 0;
+
+ *p_num_jn = 0;
+ if(!lp_host_msdfs()) {
+ return NULL;
+ }
+
+ /* Ensure all the usershares are loaded. */
+ become_root();
+ load_registry_shares();
+ sharecount = load_usershare_shares(NULL, connections_snum_used);
+ unbecome_root();
+
+ for(i=0;i < sharecount;i++) {
+ if(lp_msdfs_root(i)) {
+ jn_count += count_dfs_links(ctx, session_info, i);
+ }
+ }
+ if (jn_count == 0) {
+ return NULL;
+ }
+ jn = talloc_array(ctx, struct junction_map, jn_count);
+ if (!jn) {
+ return NULL;
+ }
+ for(i=0; i < sharecount; i++) {
+ if (*p_num_jn >= jn_count) {
+ break;
+ }
+ if(lp_msdfs_root(i)) {
+ *p_num_jn += form_junctions(ctx,
+ session_info,
+ i,
+ &jn[*p_num_jn],
+ jn_count - *p_num_jn);
+ }
+ }
+ return jn;
+}