[SCM] Samba Shared Repository - branch v3-6-test updated

Karolin Seeger kseeger at samba.org
Wed Jul 13 13:35:05 MDT 2011


The branch, v3-6-test has been updated
       via  d43d147 s3:smb2_create: use smbd_calculate_access_mask() instead of smbd_check_open_rights()
       via  89a05c3 s3:smb2_tcon: return the correct maximal_access on the share
       via  c384bf7 s3:smbd: return the real share access mask in the SMBtconX response
       via  3e87706 s3:smbd: use smbd_calculate_access_mask() also for fake_files
       via  d43f7ff s3:smbd: check the share level access mask in smbd_calculate_access_mask()
       via  5a1c2b4 s3:smbd: make smbd_calculate_access_mask() non-static
       via  bd91cb8 s3:smbd/msdfs: let create_conn_struct() check the share security descriptor
       via  b3a0350 s3: Fix bug 8102
       via  83c6e9d s3: Calculate&store the maximum share access mask
       via  283f76c s3: Return "granted" from share_access_check
       via  7b28ae9 s3:smb2_server: add some comments about change_to_user() and change_to_root_user()
       via  3de9d22 s3:smb2_server: call change_to_root_user() or smbd_smb2_request_check_tcon()
       via  fe6a325 s3:smb2_server: there's no reason to check the session id twice on a smb2_tcon request
      from  ae41415 WHATSNEW: Update changes since rc2.

http://gitweb.samba.org/?p=samba.git;a=shortlog;h=v3-6-test


- Log -----------------------------------------------------------------
commit d43d147c9d69dd23296677f9ae998c9362771682
Author: Stefan Metzmacher <metze at samba.org>
Date:   Sun Jul 10 13:09:06 2011 +0200

    s3:smb2_create: use smbd_calculate_access_mask() instead of smbd_check_open_rights()
    
    metze
    
    Autobuild-User: Stefan Metzmacher <metze at samba.org>
    Autobuild-Date: Mon Jul 11 22:45:01 CEST 2011 on sn-devel-104
    (cherry picked from commit f5d320ac0fb74d4ad95a03969366096e9b074379)
    
    The last 10 patches address bug #8102 (domuser can change ACL from his files
    over the network).

commit 89a05c3a54239d384317f9881430fac264138f3f
Author: Stefan Metzmacher <metze at samba.org>
Date:   Sun Jul 10 13:02:11 2011 +0200

    s3:smb2_tcon: return the correct maximal_access on the share
    
    metze
    (cherry picked from commit a1046389ffcc476456ac76cb701a4325d1c42ef9)

commit c384bf75284fa7280b9279d305c5404f9f1066df
Author: Stefan Metzmacher <metze at samba.org>
Date:   Mon Jul 11 16:12:57 2011 +0200

    s3:smbd: return the real share access mask in the SMBtconX response
    
    metze
    (cherry picked from commit 58eed1b295afeff6acfb8c1f10b0bb02280fd491)

commit 3e8770619c53c956f623ae852f97e6226513898d
Author: Stefan Metzmacher <metze at samba.org>
Date:   Sun Jul 10 13:59:40 2011 +0200

    s3:smbd: use smbd_calculate_access_mask() also for fake_files
    
    metze
    (cherry picked from commit 581d8fa36b73abab030168dc35fb631ccd42a388)

commit d43f7ffb9fa8449a954d2e9fc9012a00289b41e2
Author: Stefan Metzmacher <metze at samba.org>
Date:   Sun Jul 10 13:03:51 2011 +0200

    s3:smbd: check the share level access mask in smbd_calculate_access_mask()
    
    I think we should reject invalid access early,
    before we might create new files.
    
    Also smbd_check_open_rights() is only called if the file existed.
    
    metze
    (cherry picked from commit 896f105ed40dc04f83bcbfac367b309c8d957f86)

commit 5a1c2b4774c914a45bf2da7e666f6acf7f6927c6
Author: Stefan Metzmacher <metze at samba.org>
Date:   Sun Jul 10 13:00:25 2011 +0200

    s3:smbd: make smbd_calculate_access_mask() non-static
    
    metze
    (cherry picked from commit ce66d4e4a885add09edfa8e6d5eab0f3b5d63081)

commit bd91cb862c4ceb3955c742d1c516e51733a19e6e
Author: Stefan Metzmacher <metze at samba.org>
Date:   Tue Jul 12 17:31:13 2011 +0200

    s3:smbd/msdfs: let create_conn_struct() check the share security descriptor
    
    metze
    (cherry picked from commit 18f967a24881aa899b39f7676fc70a7f7aaca07b)

commit b3a035005ef98bcb31bade50a9e3ddf088302779
Author: Volker Lendecke <vl at samba.org>
Date:   Tue Jul 5 11:13:07 2011 +0200

    s3: Fix bug 8102
    
    We can't allow open with access that has been denied via the share
    security descriptor
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    
    Autobuild-User: Stefan Metzmacher <metze at samba.org>
    Autobuild-Date: Tue Jul  5 16:21:54 CEST 2011 on sn-devel-104
    (cherry picked from commit 4deca5d72804a40e68158a1183f5633dabf24761)

commit 83c6e9d3ad76e8009778e5ba0bf22e256d06ad48
Author: Volker Lendecke <vl at samba.org>
Date:   Mon Jul 4 18:35:21 2011 +0200

    s3: Calculate&store the maximum share access mask
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    (cherry picked from commit 720fa46f9443ccbe471b265f1c2b9cb9782a3c26)

commit 283f76c06308eaeaf9d134e0bfb45188ee684fb3
Author: Volker Lendecke <vl at samba.org>
Date:   Mon Jul 4 17:02:34 2011 +0200

    s3: Return "granted" from share_access_check
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    (cherry picked from commit 1c022d2e414607633323e65abbc63bb3aeaaa6a4)

commit 7b28ae90603ff152e31b2113109bdaebc540810f
Author: Stefan Metzmacher <metze at samba.org>
Date:   Fri Jul 8 09:08:39 2011 +0200

    s3:smb2_server: add some comments about change_to_user() and change_to_root_user()
    
    metze
    
    Autobuild-User: Stefan Metzmacher <metze at samba.org>
    Autobuild-Date: Fri Jul  8 13:45:46 CEST 2011 on sn-devel-104
    (cherry picked from commit dbfb88aef30a755c29015bff4699eb17925a4988)
    
    The last 3 patches address bug #8292 (Disable SMB2 for 3.6).

commit 3de9d2204e1f14c8a1d9642f3dc1e1e7e1013210
Author: Stefan Metzmacher <metze at samba.org>
Date:   Thu Jul 7 16:38:33 2011 +0200

    s3:smb2_server: call change_to_root_user() or smbd_smb2_request_check_tcon()
    
    For all requests which don't operate on a tcon, we should call
    change_to_root_user(), to match the SMB1 behavior.
    
    For SMB1 we do the following operations without AS_USER:
    
    /* 0x70 */ { "SMBtcon",reply_tcon,0},
    /* 0x71 */ { "SMBtdis",reply_tdis,DO_CHDIR},
    /* 0x72 */ { "SMBnegprot",reply_negprot,0},
    /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
    /* 0x74 */ { "SMBulogoffX",reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
    /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
    ...
    /* 0x2b */ { "SMBecho",reply_echo,0},
    ...
    /* 0xa4 */ { "SMBntcancel",reply_ntcancel, 0 },
    
    For SMB2tdis we still call smbd_smb2_request_check_tcon()
    as close_cnum() calls change_to_root_user() when needed.
    
    metze
    
    Signed-off-by: Jeremy Allison <jra at samba.org>
    (cherry picked from commit eea210eba7c20e6d04b13cf8ccd3011ee7c99157)

commit fe6a325226a5fb17e5ccf62c5d0882d97baa35b7
Author: Stefan Metzmacher <metze at samba.org>
Date:   Mon Jul 4 15:57:20 2011 +0200

    s3:smb2_server: there's no reason to check the session id twice on a smb2_tcon request
    
    metze
    
    Autobuild-User: Stefan Metzmacher <metze at samba.org>
    Autobuild-Date: Mon Jul  4 17:34:13 CEST 2011 on sn-devel-104
    (cherry picked from commit 7c96e96e9881ec1ad7b41f0ab241a5b0ac17b93f)

-----------------------------------------------------------------------

Summary of changes:
 source3/include/proto.h                   |    6 +-
 source3/include/smb.h                     |    1 +
 source3/lib/sharesec.c                    |   10 ++-
 source3/rpc_server/srvsvc/srv_srvsvc_nt.c |    4 +-
 source3/smbd/fake_file.c                  |   13 +++
 source3/smbd/globals.h                    |    5 +
 source3/smbd/msdfs.c                      |   30 +++++++
 source3/smbd/open.c                       |   54 +++++++++---
 source3/smbd/reply.c                      |    4 +-
 source3/smbd/service.c                    |   36 ++++-----
 source3/smbd/smb2_create.c                |    7 ++-
 source3/smbd/smb2_server.c                |  130 +++++++++++++++++++++++++++--
 source3/smbd/smb2_tcon.c                  |    2 +-
 source3/smbd/uid.c                        |   11 ++-
 14 files changed, 255 insertions(+), 58 deletions(-)


Changeset truncated at 500 lines:

diff --git a/source3/include/proto.h b/source3/include/proto.h
index d072502..6291f11 100644
--- a/source3/include/proto.h
+++ b/source3/include/proto.h
@@ -329,8 +329,10 @@ struct security_descriptor *get_share_security( TALLOC_CTX *ctx, const char *ser
 			      size_t *psize);
 bool set_share_security(const char *share_name, struct security_descriptor *psd);
 bool delete_share_security(const char *servicename);
-bool share_access_check(const struct security_token *token, const char *sharename,
-			uint32 desired_access);
+bool share_access_check(const struct security_token *token,
+			const char *sharename,
+			uint32 desired_access,
+			uint32_t *pgranted);
 bool parse_usershare_acl(TALLOC_CTX *ctx, const char *acl_str, struct security_descriptor **ppsd);
 
 /* The following definitions come from lib/smbrun.c  */
diff --git a/source3/include/smb.h b/source3/include/smb.h
index 3e68a99..3a64af7 100644
--- a/source3/include/smb.h
+++ b/source3/include/smb.h
@@ -408,6 +408,7 @@ typedef struct connection_struct {
 	bool printer;
 	bool ipc;
 	bool read_only; /* Attributes for the current user of the share. */
+	uint32_t share_access;
 	/* Does this filesystem honor
 	   sub second timestamps on files
 	   and directories when setting time ? */
diff --git a/source3/lib/sharesec.c b/source3/lib/sharesec.c
index c2494e2..410fc13 100644
--- a/source3/lib/sharesec.c
+++ b/source3/lib/sharesec.c
@@ -410,8 +410,10 @@ bool delete_share_security(const char *servicename)
  Can this user access with share with the required permissions ?
 ********************************************************************/
 
-bool share_access_check(const struct security_token *token, const char *sharename,
-			uint32 desired_access)
+bool share_access_check(const struct security_token *token,
+			const char *sharename,
+			uint32 desired_access,
+			uint32_t *pgranted)
 {
 	uint32 granted;
 	NTSTATUS status;
@@ -428,6 +430,10 @@ bool share_access_check(const struct security_token *token, const char *sharenam
 
 	TALLOC_FREE(psd);
 
+	if (pgranted != NULL) {
+		*pgranted = granted;
+	}
+
 	return NT_STATUS_IS_OK(status);
 }
 
diff --git a/source3/rpc_server/srvsvc/srv_srvsvc_nt.c b/source3/rpc_server/srvsvc/srv_srvsvc_nt.c
index 472a318..a078395 100644
--- a/source3/rpc_server/srvsvc/srv_srvsvc_nt.c
+++ b/source3/rpc_server/srvsvc/srv_srvsvc_nt.c
@@ -539,8 +539,8 @@ static bool is_enumeration_allowed(struct pipes_struct *p,
     if (!lp_access_based_share_enum(snum))
         return true;
 
-    return share_access_check(p->session_info->security_token, lp_servicename(snum),
-                              FILE_READ_DATA);
+    return share_access_check(p->session_info->security_token,
+			      lp_servicename(snum), FILE_READ_DATA, NULL);
 }
 
 /*******************************************************************
diff --git a/source3/smbd/fake_file.c b/source3/smbd/fake_file.c
index 81f7686..68967fb 100644
--- a/source3/smbd/fake_file.c
+++ b/source3/smbd/fake_file.c
@@ -19,6 +19,7 @@
 
 #include "includes.h"
 #include "smbd/smbd.h"
+#include "smbd/globals.h"
 #include "fake_file.h"
 #include "auth.h"
 
@@ -128,6 +129,18 @@ NTSTATUS open_fake_file(struct smb_request *req, connection_struct *conn,
 	files_struct *fsp = NULL;
 	NTSTATUS status;
 
+	status = smbd_calculate_access_mask(conn, smb_fname,
+					    false, /* fake files do not exist */
+					    access_mask, &access_mask);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(10, ("open_fake_file: smbd_calculate_access_mask "
+			"on service[%s] file[%s] returned %s\n",
+			lp_servicename(SNUM(conn)),
+			smb_fname_str_dbg(smb_fname),
+			nt_errstr(status)));
+		return status;
+	}
+
 	/* access check */
 	if (geteuid() != sec_initial_uid()) {
 		DEBUG(3, ("open_fake_file_shared: access_denied to "
diff --git a/source3/smbd/globals.h b/source3/smbd/globals.h
index d9a54d2..58e03a5 100644
--- a/source3/smbd/globals.h
+++ b/source3/smbd/globals.h
@@ -224,6 +224,11 @@ bool smbd_dirptr_lanman2_entry(TALLOC_CTX *ctx,
 			       int *_last_entry_off,
 			       struct ea_list *name_list);
 
+NTSTATUS smbd_calculate_access_mask(connection_struct *conn,
+				    const struct smb_filename *smb_fname,
+				    bool file_existed,
+				    uint32_t access_mask,
+				    uint32_t *access_mask_out);
 NTSTATUS smbd_check_open_rights(struct connection_struct *conn,
 				const struct smb_filename *smb_fname,
 				uint32_t access_mask,
diff --git a/source3/smbd/msdfs.c b/source3/smbd/msdfs.c
index ab67ac8..3bdedb8 100644
--- a/source3/smbd/msdfs.c
+++ b/source3/smbd/msdfs.c
@@ -27,6 +27,7 @@
 #include "smbd/globals.h"
 #include "msdfs.h"
 #include "auth.h"
+#include "libcli/security/security.h"
 
 /**********************************************************************
  Parse a DFS pathname of the form \hostname\service\reqpath
@@ -278,6 +279,35 @@ NTSTATUS create_conn_struct(TALLOC_CTX *ctx,
 
 	set_conn_connectpath(conn, connpath);
 
+	/*
+	 * New code to check if there's a share security descripter
+	 * added from NT server manager. This is done after the
+	 * smb.conf checks are done as we need a uid and token. JRA.
+	 *
+	 */
+	if (conn->session_info) {
+		share_access_check(conn->session_info->security_token,
+				   lp_servicename(snum), 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. */
+				DEBUG(0,("create_conn_struct: connection to %s "
+					 "denied due to security "
+					 "descriptor.\n",
+					 lp_servicename(snum)));
+				conn_free(conn);
+				return NT_STATUS_ACCESS_DENIED;
+			} else {
+				conn->read_only = true;
+			}
+		}
+	} else {
+		conn->share_access = 0;
+		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"));
diff --git a/source3/smbd/open.c b/source3/smbd/open.c
index 44b1835..81d4e69 100644
--- a/source3/smbd/open.c
+++ b/source3/smbd/open.c
@@ -76,6 +76,14 @@ NTSTATUS smbd_check_open_rights(struct connection_struct *conn,
 	/* Check if we have rights to open. */
 	NTSTATUS status;
 	struct security_descriptor *sd = NULL;
+	uint32_t rejected_share_access;
+
+	rejected_share_access = access_mask & ~(conn->share_access);
+
+	if (rejected_share_access) {
+		*access_granted = rejected_share_access;
+		return NT_STATUS_ACCESS_DENIED;
+	}
 
 	if ((access_mask & DELETE_ACCESS) && !lp_acl_check_permissions(SNUM(conn))) {
 		*access_granted = access_mask;
@@ -1514,13 +1522,15 @@ static void schedule_defer_open(struct share_mode_lock *lck,
  Work out what access_mask to use from what the client sent us.
 ****************************************************************************/
 
-static NTSTATUS calculate_access_mask(connection_struct *conn,
-					const struct smb_filename *smb_fname,
-					bool file_existed,
-					uint32_t access_mask,
-					uint32_t *access_mask_out)
+NTSTATUS smbd_calculate_access_mask(connection_struct *conn,
+				    const struct smb_filename *smb_fname,
+				    bool file_existed,
+				    uint32_t access_mask,
+				    uint32_t *access_mask_out)
 {
 	NTSTATUS status;
+	uint32_t orig_access_mask = access_mask;
+	uint32_t rejected_share_access;
 
 	/*
 	 * Convert GENERIC bits to specific bits.
@@ -1541,8 +1551,8 @@ static NTSTATUS calculate_access_mask(connection_struct *conn,
 					SECINFO_DACL),&sd);
 
 			if (!NT_STATUS_IS_OK(status)) {
-				DEBUG(10, ("calculate_access_mask: Could not get acl "
-					"on file %s: %s\n",
+				DEBUG(10,("smbd_calculate_access_mask: "
+					"Could not get acl on file %s: %s\n",
 					smb_fname_str_dbg(smb_fname),
 					nt_errstr(status)));
 				return NT_STATUS_ACCESS_DENIED;
@@ -1557,8 +1567,9 @@ static NTSTATUS calculate_access_mask(connection_struct *conn,
 			TALLOC_FREE(sd);
 
 			if (!NT_STATUS_IS_OK(status)) {
-				DEBUG(10, ("calculate_access_mask: Access denied on "
-					"file %s: when calculating maximum access\n",
+				DEBUG(10, ("smbd_calculate_access_mask: "
+					"Access denied on file %s: "
+					"when calculating maximum access\n",
 					smb_fname_str_dbg(smb_fname)));
 				return NT_STATUS_ACCESS_DENIED;
 			}
@@ -1567,6 +1578,21 @@ static NTSTATUS calculate_access_mask(connection_struct *conn,
 		} else {
 			access_mask = FILE_GENERIC_ALL;
 		}
+
+		access_mask &= conn->share_access;
+	}
+
+	rejected_share_access = access_mask & ~(conn->share_access);
+
+	if (rejected_share_access) {
+		DEBUG(10, ("smbd_calculate_access_mask: Access denied on "
+			"file %s: rejected by share access mask[0x%08X] "
+			"orig[0x%08X] mapped[0x%08X] reject[0x%08X]\n",
+			smb_fname_str_dbg(smb_fname),
+			conn->share_access,
+			orig_access_mask, access_mask,
+			rejected_share_access));
+		return NT_STATUS_ACCESS_DENIED;
 	}
 
 	*access_mask_out = access_mask;
@@ -1890,11 +1916,11 @@ static NTSTATUS open_file_ntcreate(connection_struct *conn,
 		}
 	}
 
-	status = calculate_access_mask(conn, smb_fname, file_existed,
+	status = smbd_calculate_access_mask(conn, smb_fname, file_existed,
 					access_mask,
 					&access_mask); 
 	if (!NT_STATUS_IS_OK(status)) {
-		DEBUG(10, ("open_file_ntcreate: calculate_access_mask "
+		DEBUG(10, ("open_file_ntcreate: smbd_calculate_access_mask "
 			"on file %s returned %s\n",
 			smb_fname_str_dbg(smb_fname), nt_errstr(status)));
 		return status;
@@ -2737,10 +2763,10 @@ static NTSTATUS open_directory(connection_struct *conn,
 		return NT_STATUS_NOT_A_DIRECTORY;
 	}
 
-	status = calculate_access_mask(conn, smb_dname, dir_existed,
-				       access_mask, &access_mask);
+	status = smbd_calculate_access_mask(conn, smb_dname, dir_existed,
+					    access_mask, &access_mask);
 	if (!NT_STATUS_IS_OK(status)) {
-		DEBUG(10, ("open_directory: calculate_access_mask "
+		DEBUG(10, ("open_directory: smbd_calculate_access_mask "
 			"on file %s returned %s\n",
 			smb_fname_str_dbg(smb_dname),
 			nt_errstr(status)));
diff --git a/source3/smbd/reply.c b/source3/smbd/reply.c
index 099a36e..c594a6b 100644
--- a/source3/smbd/reply.c
+++ b/source3/smbd/reply.c
@@ -835,9 +835,7 @@ void reply_tcon_and_X(struct smb_request *req)
 				perm1 = FILE_ALL_ACCESS;
 				perm2 = FILE_ALL_ACCESS;
 			} else {
-				perm1 = CAN_WRITE(conn) ?
-						SHARE_ALL_ACCESS :
-						SHARE_READ_ONLY;
+				perm1 = conn->share_access;
 			}
 
 			SIVAL(req->outbuf, smb_vwv3, perm1);
diff --git a/source3/smbd/service.c b/source3/smbd/service.c
index a8cd756..d88c02c 100644
--- a/source3/smbd/service.c
+++ b/source3/smbd/service.c
@@ -853,27 +853,21 @@ connection_struct *make_connection_snum(struct smbd_server_connection *sconn,
 	 *
 	 */
 
-	{
-		bool can_write = False;
-
-		can_write = share_access_check(conn->session_info->security_token,
-					       lp_servicename(snum),
-					       FILE_WRITE_DATA);
-
-		if (!can_write) {
-			if (!share_access_check(conn->session_info->security_token,
-						lp_servicename(snum),
-						FILE_READ_DATA)) {
-				/* No access, read or write. */
-				DEBUG(0,("make_connection: connection to %s "
-					 "denied due to security "
-					 "descriptor.\n",
-					  lp_servicename(snum)));
-				*pstatus = NT_STATUS_ACCESS_DENIED;
-				goto err_root_exit;
-			} else {
-				conn->read_only = True;
-			}
+	share_access_check(conn->session_info->security_token,
+			   lp_servicename(snum), 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. */
+			DEBUG(0,("make_connection: connection to %s "
+				 "denied due to security "
+				 "descriptor.\n",
+				 lp_servicename(snum)));
+			*pstatus = NT_STATUS_ACCESS_DENIED;
+			goto err_root_exit;
+		} else {
+			conn->read_only = True;
 		}
 	}
 	/* Initialise VFS function pointers */
diff --git a/source3/smbd/smb2_create.c b/source3/smbd/smb2_create.c
index 3478f34..fcd8945 100644
--- a/source3/smbd/smb2_create.c
+++ b/source3/smbd/smb2_create.c
@@ -736,8 +736,13 @@ static struct tevent_req *smbd_smb2_create_send(TALLOC_CTX *mem_ctx,
 				uint32_t max_access_granted;
 				DATA_BLOB blob = data_blob_const(p, sizeof(p));
 
-				status = smbd_check_open_rights(smb1req->conn,
+				status = smbd_calculate_access_mask(smb1req->conn,
 							result->fsp_name,
+							/*
+							 * at this stage
+							 * it exists
+							 */
+							true,
 							SEC_FLAG_MAXIMUM_ALLOWED,
 							&max_access_granted);
 
diff --git a/source3/smbd/smb2_server.c b/source3/smbd/smb2_server.c
index 416e3c1..c5c7a8e 100644
--- a/source3/smbd/smb2_server.c
+++ b/source3/smbd/smb2_server.c
@@ -1104,6 +1104,14 @@ NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 	}
 
+	/*
+	 * Check if the client provided a valid session id,
+	 * if so smbd_smb2_request_check_session() calls
+	 * set_current_user_info().
+	 *
+	 * As some command don't require a valid session id
+	 * we defer the check of the session_status
+	 */
 	session_status = smbd_smb2_request_check_session(req);
 
 	req->do_signing = false;
@@ -1139,6 +1147,9 @@ NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 
 	switch (opcode) {
 	case SMB2_OP_NEGPROT:
+		/* This call needs to be run as root */
+		change_to_root_user();
+
 		{
 			START_PROFILE(smb2_negprot);
 			return_value = smbd_smb2_request_process_negprot(req);
@@ -1147,6 +1158,9 @@ NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 		break;
 
 	case SMB2_OP_SESSSETUP:
+		/* This call needs to be run as root */
+		change_to_root_user();
+
 		{
 			START_PROFILE(smb2_sesssetup);
 			return_value = smbd_smb2_request_process_sesssetup(req);
@@ -1160,6 +1174,9 @@ NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 			break;
 		}
 
+		/* This call needs to be run as root */
+		change_to_root_user();
+
 		{
 			START_PROFILE(smb2_logoff);
 			return_value = smbd_smb2_request_process_logoff(req);
@@ -1172,11 +1189,15 @@ NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 			return_value = smbd_smb2_request_error(req, session_status);
 			break;
 		}
-		status = smbd_smb2_request_check_session(req);
-		if (!NT_STATUS_IS_OK(status)) {
-			return_value = smbd_smb2_request_error(req, status);
-			break;
-		}
+
+		/*
+		 * This call needs to be run as root.
+		 *
+		 * smbd_smb2_request_process_tcon()
+		 * calls make_connection_snum(), which will call
+		 * change_to_user(), when needed.
+		 */
+		change_to_root_user();
 
 		{
 			START_PROFILE(smb2_tcon);
@@ -1190,11 +1211,20 @@ NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 			return_value = smbd_smb2_request_error(req, session_status);
 			break;
 		}
+		/*
+		 * This call needs to be run as user.
+		 *
+		 * smbd_smb2_request_check_tcon()
+		 * calls change_to_user() on success.
+		 */
 		status = smbd_smb2_request_check_tcon(req);
 		if (!NT_STATUS_IS_OK(status)) {
 			return_value = smbd_smb2_request_error(req, status);
 			break;
 		}
+		/* This call needs to be run as root */
+		change_to_root_user();
+
 
 		{
 			START_PROFILE(smb2_tdis);
@@ -1208,6 +1238,12 @@ NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 			return_value = smbd_smb2_request_error(req, session_status);
 			break;
 		}
+		/*
+		 * This call needs to be run as user.
+		 *
+		 * smbd_smb2_request_check_tcon()
+		 * calls change_to_user() on success.
+		 */
 		status = smbd_smb2_request_check_tcon(req);
 		if (!NT_STATUS_IS_OK(status)) {
 			return_value = smbd_smb2_request_error(req, status);
@@ -1226,6 +1262,12 @@ NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 			return_value = smbd_smb2_request_error(req, session_status);
 			break;
 		}
+		/*
+		 * This call needs to be run as user.
+		 *
+		 * smbd_smb2_request_check_tcon()
+		 * calls change_to_user() on success.
+		 */
 		status = smbd_smb2_request_check_tcon(req);
 		if (!NT_STATUS_IS_OK(status)) {
 			return_value = smbd_smb2_request_error(req, status);
@@ -1244,6 +1286,12 @@ NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 			return_value = smbd_smb2_request_error(req, session_status);
 			break;
 		}
+		/*
+		 * This call needs to be run as user.
+		 *
+		 * smbd_smb2_request_check_tcon()
+		 * calls change_to_user() on success.
+		 */
 		status = smbd_smb2_request_check_tcon(req);
 		if (!NT_STATUS_IS_OK(status)) {
 			return_value = smbd_smb2_request_error(req, status);
@@ -1262,6 +1310,12 @@ NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 			return_value = smbd_smb2_request_error(req, session_status);
 			break;
 		}
+		/*
+		 * This call needs to be run as user.
+		 *
+		 * smbd_smb2_request_check_tcon()
+		 * calls change_to_user() on success.


-- 
Samba Shared Repository


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