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30c9d6cca5
According to several places on the Internet and the samba winbind code, this is hard limited to 15 in windows, not 5. This does balloon out the allocation of each by 40 bytes, but I don't see any alternative. Also, rename it to SID_MAX_SUB_AUTHORITIES to match the alleged name of this constant in the windows header files Finally, rename SIDLEN to SID_STRING_MAX, fix the value to reflect the change to SID_MAX_SUB_AUTHORITIES and document how it was determined. Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
118 lines
3.3 KiB
C
118 lines
3.3 KiB
C
/*
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* fs/cifs/cifsacl.h
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*
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* Copyright (c) International Business Machines Corp., 2007
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _CIFSACL_H
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#define _CIFSACL_H
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#define NUM_AUTHS 6 /* number of authority fields */
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#define SID_MAX_SUB_AUTHORITIES (15) /* max number of sub authority fields */
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#define NUM_WK_SIDS 7 /* number of well known sids */
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#define SIDNAMELENGTH 20 /* long enough for the ones we care about */
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#define DEFSECDESCLEN 192 /* sec desc len contaiting a dacl with three aces */
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#define READ_BIT 0x4
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#define WRITE_BIT 0x2
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#define EXEC_BIT 0x1
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#define UBITSHIFT 6
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#define GBITSHIFT 3
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#define ACCESS_ALLOWED 0
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#define ACCESS_DENIED 1
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#define SIDOWNER 1
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#define SIDGROUP 2
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/*
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* Maximum size of a string representation of a SID:
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*
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* The fields are unsigned values in decimal. So:
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*
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* u8: max 3 bytes in decimal
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* u32: max 10 bytes in decimal
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*
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* "S-" + 3 bytes for version field + 4 bytes for each authority field (3 bytes
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* per number + 1 for '-') + 11 bytes for each subauthority field (10 bytes
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* per number + 1 for '-') + NULL terminator.
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*/
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#define SID_STRING_MAX (195)
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#define SID_ID_MAPPED 0
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#define SID_ID_PENDING 1
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#define SID_MAP_EXPIRE (3600 * HZ) /* map entry expires after one hour */
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#define SID_MAP_RETRY (300 * HZ) /* wait 5 minutes for next attempt to map */
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struct cifs_ntsd {
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__le16 revision; /* revision level */
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__le16 type;
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__le32 osidoffset;
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__le32 gsidoffset;
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__le32 sacloffset;
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__le32 dacloffset;
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} __attribute__((packed));
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struct cifs_sid {
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__u8 revision; /* revision level */
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__u8 num_subauth;
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__u8 authority[NUM_AUTHS];
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__le32 sub_auth[SID_MAX_SUB_AUTHORITIES]; /* sub_auth[num_subauth] */
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} __attribute__((packed));
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/* size of a struct cifs_sid, sans sub_auth array */
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#define CIFS_SID_BASE_SIZE (1 + 1 + NUM_AUTHS)
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struct cifs_acl {
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__le16 revision; /* revision level */
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__le16 size;
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__le32 num_aces;
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} __attribute__((packed));
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struct cifs_ace {
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__u8 type;
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__u8 flags;
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__le16 size;
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__le32 access_req;
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struct cifs_sid sid; /* ie UUID of user or group who gets these perms */
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} __attribute__((packed));
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struct cifs_wksid {
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struct cifs_sid cifssid;
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char sidname[SIDNAMELENGTH];
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} __attribute__((packed));
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struct cifs_sid_id {
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unsigned int refcount; /* increment with spinlock, decrement without */
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unsigned long id;
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unsigned long time;
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unsigned long state;
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char *sidstr;
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struct rb_node rbnode;
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struct cifs_sid sid;
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};
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#ifdef __KERNEL__
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extern struct key_type cifs_idmap_key_type;
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extern const struct cred *root_cred;
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#endif /* KERNEL */
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#endif /* _CIFSACL_H */
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