cifs: Fix getting and setting SACLs over SMB1

SMB1 callback get_cifs_acl_by_fid() currently ignores its last argument and
therefore ignores request for SACL_SECINFO. Fix this issue by correctly
propagating info argument from get_cifs_acl() and get_cifs_acl_by_fid() to
CIFSSMBGetCIFSACL() function and pass SACL_SECINFO when requested.

For accessing SACLs it is needed to open object with SYSTEM_SECURITY
access. Pass this flag when trying to get or set SACLs.

Same logic is in the SMB2+ code path.

This change fixes getting and setting of "system.cifs_ntsd_full" and
"system.smb3_ntsd_full" xattrs over SMB1 as currently it silentely ignored
SACL part of passed xattr buffer.

Fixes: 3970acf ("SMB3: Add support for getting and setting SACLs")
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: pali

fs/smb/client/cifsacl.c

@@ -1395,7 +1395,7 @@ static int build_sec_desc(struct smb_ntsd *pntsd, struct smb_ntsd *pnntsd,
 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
 struct smb_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb,
 				      const struct cifs_fid *cifsfid, u32 *pacllen,
-				      u32 __maybe_unused unused)
+				      u32 info)
 {
 	struct smb_ntsd *pntsd = NULL;
 	unsigned int xid;
@@ -1407,7 +1407,7 @@ struct smb_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb,
 
 	xid = get_xid();
 	rc = CIFSSMBGetCIFSACL(xid, tlink_tcon(tlink), cifsfid->netfid, &pntsd,
-				pacllen);
+				pacllen, info);
 	free_xid(xid);
 
 	cifs_put_tlink(tlink);
@@ -1419,7 +1419,7 @@ struct smb_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb,
 }
 
 static struct smb_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb,
-		const char *path, u32 *pacllen)
+		const char *path, u32 *pacllen, u32 info)
 {
 	struct smb_ntsd *pntsd = NULL;
 	int oplock = 0;
@@ -1446,9 +1446,12 @@ static struct smb_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb,
 		.fid = &fid,
 	};
 
+	if (info & SACL_SECINFO)
+		oparms.desired_access |= SYSTEM_SECURITY;
+
 	rc = CIFS_open(xid, &oparms, &oplock, NULL);
 	if (!rc) {
-		rc = CIFSSMBGetCIFSACL(xid, tcon, fid.netfid, &pntsd, pacllen);
+		rc = CIFSSMBGetCIFSACL(xid, tcon, fid.netfid, &pntsd, pacllen, info);
 		CIFSSMBClose(xid, tcon, fid.netfid);
 	}
 
@@ -1472,7 +1475,7 @@ struct smb_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb,
 	if (inode)
 		open_file = find_readable_file(CIFS_I(inode), true);
 	if (!open_file)
-		return get_cifs_acl_by_path(cifs_sb, path, pacllen);
+		return get_cifs_acl_by_path(cifs_sb, path, pacllen, info);
 
 	pntsd = get_cifs_acl_by_fid(cifs_sb, &open_file->fid, pacllen, info);
 	cifsFileInfo_put(open_file);
@@ -1485,7 +1488,7 @@ int set_cifs_acl(struct smb_ntsd *pnntsd, __u32 acllen,
 {
 	int oplock = 0;
 	unsigned int xid;
-	int rc, access_flags;
+	int rc, access_flags = 0;
 	struct cifs_tcon *tcon;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 	struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
@@ -1498,10 +1501,12 @@ int set_cifs_acl(struct smb_ntsd *pnntsd, __u32 acllen,
 	tcon = tlink_tcon(tlink);
 	xid = get_xid();
 
-	if (aclflag == CIFS_ACL_OWNER || aclflag == CIFS_ACL_GROUP)
-		access_flags = WRITE_OWNER;
-	else
-		access_flags = WRITE_DAC;
+	if (aclflag & CIFS_ACL_OWNER || aclflag & CIFS_ACL_GROUP)
+		access_flags |= WRITE_OWNER;
+	if (aclflag & CIFS_ACL_SACL)
+		access_flags |= SYSTEM_SECURITY;
+	if (aclflag & CIFS_ACL_DACL)
+		access_flags |= WRITE_DAC;
 
 	oparms = (struct cifs_open_parms) {
 		.tcon = tcon,

fs/smb/client/cifsproto.h

@@ -557,7 +557,7 @@ extern int CIFSSMBSetEA(const unsigned int xid, struct cifs_tcon *tcon,
 		const struct nls_table *nls_codepage,
 		struct cifs_sb_info *cifs_sb);
 extern int CIFSSMBGetCIFSACL(const unsigned int xid, struct cifs_tcon *tcon,
-			__u16 fid, struct smb_ntsd **acl_inf, __u32 *buflen);
+			__u16 fid, struct smb_ntsd **acl_inf, __u32 *buflen, __u32 info);
 extern int CIFSSMBSetCIFSACL(const unsigned int, struct cifs_tcon *, __u16,
 			struct smb_ntsd *pntsd, __u32 len, int aclflag);
 extern int cifs_do_get_acl(const unsigned int xid, struct cifs_tcon *tcon,

fs/smb/client/cifssmb.c

@@ -3369,7 +3369,7 @@ validate_ntransact(char *buf, char **ppparm, char **ppdata,
 /* Get Security Descriptor (by handle) from remote server for a file or dir */
 int
 CIFSSMBGetCIFSACL(const unsigned int xid, struct cifs_tcon *tcon, __u16 fid,
-		  struct smb_ntsd **acl_inf, __u32 *pbuflen)
+		  struct smb_ntsd **acl_inf, __u32 *pbuflen, __u32 info)
 {
 	int rc = 0;
 	int buf_type = 0;
@@ -3392,7 +3392,7 @@ CIFSSMBGetCIFSACL(const unsigned int xid, struct cifs_tcon *tcon, __u16 fid,
 	pSMB->MaxSetupCount = 0;
 	pSMB->Fid = fid; /* file handle always le */
 	pSMB->AclFlags = cpu_to_le32(CIFS_ACL_OWNER | CIFS_ACL_GROUP |
-				     CIFS_ACL_DACL);
+				     CIFS_ACL_DACL | info);
 	pSMB->ByteCount = cpu_to_le16(11); /* 3 bytes pad + 8 bytes parm */
 	inc_rfc1001_len(pSMB, 11);
 	iov[0].iov_base = (char *)pSMB;