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Commit 7505e052 authored by Steve French's avatar Steve French
Browse files

[CIFS] If no Access Control Entries, set mode perm bits to zero 



Also clean up ACL code

Acked-by: default avatarShirish Pargaonkar <shirishp@us.ibm.com>
Signed-off-by: default avatarSteve French <sfrench@us.ibm.com>
parent 1fb64bfc

fs/cifs/cifsacl.c

+55 −22
Original line number Diff line number Diff line
@@ -223,6 +223,17 @@ static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl, 
		le32_to_cpu(pdacl->num_aces)));

#endif



	/* reset rwx permissions for user/group/other.

	   Also, if num_aces is 0 i.e. DACL has no ACEs,

	   user/group/other have no permissions */

	inode->i_mode &= ~(S_IRWXUGO);



	if (!pdacl) {

		/* no DACL in the security descriptor, set

		   all the permissions for user/group/other */

		inode->i_mode |= S_IRWXUGO;

		return;

	}

	acl_base = (char *)pdacl;

	acl_size = sizeof(struct cifs_acl);
@@ -235,9 +246,6 @@ static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl, 
		cifscred->aces = kmalloc(num_aces *

			sizeof(struct cifs_ace *), GFP_KERNEL);*/



		/* reset rwx permissions for user/group/other */

		inode->i_mode &= ~(S_IRWXUGO);



		for (i = 0; i < num_aces; ++i) {

			ppace[i] = (struct cifs_ace *) (acl_base + acl_size);

#ifdef CONFIG_CIFS_DEBUG2
@@ -309,6 +317,7 @@ static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len, 
	struct cifs_sid *owner_sid_ptr, *group_sid_ptr;

	struct cifs_acl *dacl_ptr; /* no need for SACL ptr */

	char *end_of_acl = ((char *)pntsd) + acl_len;

	__u32 dacloffset;



	if ((inode == NULL) || (pntsd == NULL))

		return -EIO;
@@ -317,15 +326,14 @@ static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len, 
				le32_to_cpu(pntsd->osidoffset));

	group_sid_ptr = (struct cifs_sid *)((char *)pntsd +

				le32_to_cpu(pntsd->gsidoffset));

	dacl_ptr = (struct cifs_acl *)((char *)pntsd +

				le32_to_cpu(pntsd->dacloffset));

	dacloffset = le32_to_cpu(pntsd->dacloffset);

	dacl_ptr = (struct cifs_acl *)(char *)pntsd + dacloffset;

#ifdef CONFIG_CIFS_DEBUG2

	cFYI(1, ("revision %d type 0x%x ooffset 0x%x goffset 0x%x "

		 "sacloffset 0x%x dacloffset 0x%x",

		 pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset),

		 le32_to_cpu(pntsd->gsidoffset),

		 le32_to_cpu(pntsd->sacloffset),

		 le32_to_cpu(pntsd->dacloffset)));

		 le32_to_cpu(pntsd->sacloffset), dacloffset));

#endif

/*	cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */

	rc = parse_sid(owner_sid_ptr, end_of_acl);
@@ -336,7 +344,11 @@ static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len, 
	if (rc)

		return rc;



	parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, group_sid_ptr, inode);

	if (dacloffset)

		parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr,

		group_sid_ptr, inode);

	else

		cFYI(1, ("no ACL")); /* BB grant all or default perms? */



/*	cifscred->uid = owner_sid_ptr->rid;

	cifscred->gid = group_sid_ptr->rid;
@@ -350,9 +362,9 @@ static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len, 
}





/* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */



void acl_to_uid_mode(struct inode *inode, const char *path)

/* Retrieve an ACL from the server */

static struct cifs_ntsd *get_cifs_acl(u32 *pacllen, struct inode *inode,

				       const char *path)

{

	struct cifsFileInfo *open_file;

	int unlock_file = FALSE;
@@ -362,19 +374,18 @@ void acl_to_uid_mode(struct inode *inode, const char *path) 
	struct super_block *sb;

	struct cifs_sb_info *cifs_sb;

	struct cifs_ntsd *pntsd = NULL;

	__u32 acllen;



	cFYI(1, ("get mode from ACL for %s", path));



	if (inode == NULL)

		return;

		return NULL;



	xid = GetXid();

	open_file = find_readable_file(CIFS_I(inode));

	sb = inode->i_sb;

	if (sb == NULL) {

		FreeXid(xid);

		return;

		return NULL;

	}

	cifs_sb = CIFS_SB(sb);
@@ -391,25 +402,44 @@ void acl_to_uid_mode(struct inode *inode, const char *path) 
		if (rc != 0) {

			cERROR(1, ("Unable to open file to get ACL"));

			FreeXid(xid);

			return;

			return NULL;

		}

	}



	rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, &acllen);

	cFYI(1, ("GetCIFSACL rc = %d ACL len %d", rc, acllen));

	rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, pacllen);

	cFYI(1, ("GetCIFSACL rc = %d ACL len %d", rc, *pacllen));

	if (unlock_file == TRUE)

		atomic_dec(&open_file->wrtPending);

	else

		CIFSSMBClose(xid, cifs_sb->tcon, fid);



	/* parse ACEs */

	if (!rc)

	FreeXid(xid);

	return pntsd;

}



/* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */

void acl_to_uid_mode(struct inode *inode, const char *path)

{

	struct cifs_ntsd *pntsd = NULL;

	u32 acllen = 0;

	int rc = 0;



#ifdef CONFIG_CIFS_DEBUG2

	cFYI(1, ("converting ACL to mode for %s", path));

#endif

	pntsd = get_cifs_acl(&acllen, inode, path);



	/* if we can retrieve the ACL, now parse Access Control Entries, ACEs */

	if (pntsd)

		rc = parse_sec_desc(pntsd, acllen, inode);

	if (rc)

		cFYI(1, ("parse sec desc failed rc = %d", rc));



	kfree(pntsd);

	FreeXid(xid);

	return;

}



/* Convert mode bits to an ACL so we can update the ACL on the server */

int mode_to_acl(struct inode *inode, const char *path)

{

	int rc = 0;
@@ -419,12 +449,15 @@ int mode_to_acl(struct inode *inode, const char *path) 
	cFYI(1, ("set ACL from mode for %s", path));



	/* Get the security descriptor */

	pntsd = get_cifs_acl(&acllen, inode, path);



	/* Add/Modify the three ACEs for owner, group, everyone */

	/* Add/Modify the three ACEs for owner, group, everyone

	   while retaining the other ACEs */



	/* Set the security descriptor */

	kfree(pntsd);





	kfree(pntsd);

	return rc;

}

#endif /* CONFIG_CIFS_EXPERIMENTAL */

fs/cifs/cifspdu.h

+23 −0
Original line number Diff line number Diff line
@@ -1228,6 +1228,29 @@ typedef struct smb_com_transaction_qsec_req { 
	__le32 AclFlags;

} __attribute__((packed)) QUERY_SEC_DESC_REQ;





typedef struct smb_com_transaction_ssec_req {

	struct smb_hdr hdr;     /* wct = 19 */

	__u8 MaxSetupCount;

	__u16 Reserved;

	__le32 TotalParameterCount;

	__le32 TotalDataCount;

	__le32 MaxParameterCount;

	__le32 MaxDataCount;

	__le32 ParameterCount;

	__le32 ParameterOffset;

	__le32 DataCount;

	__le32 DataOffset;

	__u8 SetupCount; /* no setup words follow subcommand */

	/* SNIA spec incorrectly included spurious pad here */

	__le16 SubCommand; /* 3 = SET_SECURITY_DESC */

	__le16 ByteCount; /* bcc = 3 + 8 */

	__u8 Pad[3];

	__u16 Fid;

	__u16 Reserved2;

	__le32 AclFlags;

} __attribute__((packed)) SET_SEC_DESC_REQ;



typedef struct smb_com_transaction_change_notify_req {

	struct smb_hdr hdr;     /* wct = 23 */

	__u8 MaxSetupCount;

fs/cifs/connect.c

+1 −1
Original line number Diff line number Diff line
@@ -793,7 +793,7 @@ cifs_parse_mount_options(char *options, const char *devname, 
	vol->linux_gid = current->gid;

	vol->dir_mode = S_IRWXUGO;

	/* 2767 perms indicate mandatory locking support */

	vol->file_mode = S_IALLUGO & ~(S_ISUID | S_IXGRP);

	vol->file_mode = (S_IRWXUGO | S_ISGID) & (~S_IXGRP);



	/* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */

	vol->rw = TRUE;