| /* |
| * fs/cifs/cifsacl.c |
| * |
| * Copyright (C) International Business Machines Corp., 2007 |
| * Author(s): Steve French (sfrench@us.ibm.com) |
| * |
| * Contains the routines for mapping CIFS/NTFS ACLs |
| * |
| * This library is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Lesser General Public License as published |
| * by the Free Software Foundation; either version 2.1 of the License, or |
| * (at your option) any later version. |
| * |
| * This library 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 Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public License |
| * along with this library; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include <linux/fs.h> |
| #include "cifspdu.h" |
| #include "cifsglob.h" |
| #include "cifsacl.h" |
| #include "cifsproto.h" |
| #include "cifs_debug.h" |
| |
| |
| #ifdef CONFIG_CIFS_EXPERIMENTAL |
| |
| static struct cifs_wksid wksidarr[NUM_WK_SIDS] = { |
| {{1, 0, {0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0} }, "null user"}, |
| {{1, 1, {0, 0, 0, 0, 0, 1}, {0, 0, 0, 0, 0} }, "nobody"}, |
| {{1, 1, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(11), 0, 0, 0, 0} }, "net-users"}, |
| {{1, 1, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(18), 0, 0, 0, 0} }, "sys"}, |
| {{1, 2, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(32), cpu_to_le32(544), 0, 0, 0} }, "root"}, |
| {{1, 2, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(32), cpu_to_le32(545), 0, 0, 0} }, "users"}, |
| {{1, 2, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(32), cpu_to_le32(546), 0, 0, 0} }, "guest"} } |
| ; |
| |
| |
| /* security id for everyone */ |
| static const struct cifs_sid sid_everyone = { |
| 1, 1, {0, 0, 0, 0, 0, 1}, {0} }; |
| /* group users */ |
| static const struct cifs_sid sid_user = {1, 2 , {0, 0, 0, 0, 0, 5}, {} }; |
| |
| |
| int match_sid(struct cifs_sid *ctsid) |
| { |
| int i, j; |
| int num_subauth, num_sat, num_saw; |
| struct cifs_sid *cwsid; |
| |
| if (!ctsid) |
| return (-1); |
| |
| for (i = 0; i < NUM_WK_SIDS; ++i) { |
| cwsid = &(wksidarr[i].cifssid); |
| |
| /* compare the revision */ |
| if (ctsid->revision != cwsid->revision) |
| continue; |
| |
| /* compare all of the six auth values */ |
| for (j = 0; j < 6; ++j) { |
| if (ctsid->authority[j] != cwsid->authority[j]) |
| break; |
| } |
| if (j < 6) |
| continue; /* all of the auth values did not match */ |
| |
| /* compare all of the subauth values if any */ |
| num_sat = ctsid->num_subauth; |
| num_saw = cwsid->num_subauth; |
| num_subauth = num_sat < num_saw ? num_sat : num_saw; |
| if (num_subauth) { |
| for (j = 0; j < num_subauth; ++j) { |
| if (ctsid->sub_auth[j] != cwsid->sub_auth[j]) |
| break; |
| } |
| if (j < num_subauth) |
| continue; /* all sub_auth values do not match */ |
| } |
| |
| cFYI(1, ("matching sid: %s\n", wksidarr[i].sidname)); |
| return (0); /* sids compare/match */ |
| } |
| |
| cFYI(1, ("No matching sid")); |
| return (-1); |
| } |
| |
| /* if the two SIDs (roughly equivalent to a UUID for a user or group) are |
| the same returns 1, if they do not match returns 0 */ |
| int compare_sids(const struct cifs_sid *ctsid, const struct cifs_sid *cwsid) |
| { |
| int i; |
| int num_subauth, num_sat, num_saw; |
| |
| if ((!ctsid) || (!cwsid)) |
| return (0); |
| |
| /* compare the revision */ |
| if (ctsid->revision != cwsid->revision) |
| return (0); |
| |
| /* compare all of the six auth values */ |
| for (i = 0; i < 6; ++i) { |
| if (ctsid->authority[i] != cwsid->authority[i]) |
| return (0); |
| } |
| |
| /* compare all of the subauth values if any */ |
| num_sat = ctsid->num_subauth; |
| num_saw = cwsid->num_subauth; |
| num_subauth = num_sat < num_saw ? num_sat : num_saw; |
| if (num_subauth) { |
| for (i = 0; i < num_subauth; ++i) { |
| if (ctsid->sub_auth[i] != cwsid->sub_auth[i]) |
| return (0); |
| } |
| } |
| |
| return (1); /* sids compare/match */ |
| } |
| |
| |
| /* copy ntsd, owner sid, and group sid from a security descriptor to another */ |
| static void copy_sec_desc(const struct cifs_ntsd *pntsd, |
| struct cifs_ntsd *pnntsd, __u32 sidsoffset) |
| { |
| int i; |
| |
| struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
| struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr; |
| |
| /* copy security descriptor control portion */ |
| pnntsd->revision = pntsd->revision; |
| pnntsd->type = pntsd->type; |
| pnntsd->dacloffset = cpu_to_le32(sizeof(struct cifs_ntsd)); |
| pnntsd->sacloffset = 0; |
| pnntsd->osidoffset = cpu_to_le32(sidsoffset); |
| pnntsd->gsidoffset = cpu_to_le32(sidsoffset + sizeof(struct cifs_sid)); |
| |
| /* copy owner sid */ |
| owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
| le32_to_cpu(pntsd->osidoffset)); |
| nowner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset); |
| |
| nowner_sid_ptr->revision = owner_sid_ptr->revision; |
| nowner_sid_ptr->num_subauth = owner_sid_ptr->num_subauth; |
| for (i = 0; i < 6; i++) |
| nowner_sid_ptr->authority[i] = owner_sid_ptr->authority[i]; |
| for (i = 0; i < 5; i++) |
| nowner_sid_ptr->sub_auth[i] = owner_sid_ptr->sub_auth[i]; |
| |
| /* copy group sid */ |
| group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
| le32_to_cpu(pntsd->gsidoffset)); |
| ngroup_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset + |
| sizeof(struct cifs_sid)); |
| |
| ngroup_sid_ptr->revision = group_sid_ptr->revision; |
| ngroup_sid_ptr->num_subauth = group_sid_ptr->num_subauth; |
| for (i = 0; i < 6; i++) |
| ngroup_sid_ptr->authority[i] = group_sid_ptr->authority[i]; |
| for (i = 0; i < 5; i++) |
| ngroup_sid_ptr->sub_auth[i] = |
| cpu_to_le32(group_sid_ptr->sub_auth[i]); |
| |
| return; |
| } |
| |
| |
| /* |
| change posix mode to reflect permissions |
| pmode is the existing mode (we only want to overwrite part of this |
| bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007 |
| */ |
| static void access_flags_to_mode(__le32 ace_flags, int type, umode_t *pmode, |
| umode_t *pbits_to_set) |
| { |
| __u32 flags = le32_to_cpu(ace_flags); |
| /* the order of ACEs is important. The canonical order is to begin with |
| DENY entries followed by ALLOW, otherwise an allow entry could be |
| encountered first, making the subsequent deny entry like "dead code" |
| which would be superflous since Windows stops when a match is made |
| for the operation you are trying to perform for your user */ |
| |
| /* For deny ACEs we change the mask so that subsequent allow access |
| control entries do not turn on the bits we are denying */ |
| if (type == ACCESS_DENIED) { |
| if (flags & GENERIC_ALL) |
| *pbits_to_set &= ~S_IRWXUGO; |
| |
| if ((flags & GENERIC_WRITE) || |
| ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) |
| *pbits_to_set &= ~S_IWUGO; |
| if ((flags & GENERIC_READ) || |
| ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) |
| *pbits_to_set &= ~S_IRUGO; |
| if ((flags & GENERIC_EXECUTE) || |
| ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) |
| *pbits_to_set &= ~S_IXUGO; |
| return; |
| } else if (type != ACCESS_ALLOWED) { |
| cERROR(1, ("unknown access control type %d", type)); |
| return; |
| } |
| /* else ACCESS_ALLOWED type */ |
| |
| if (flags & GENERIC_ALL) { |
| *pmode |= (S_IRWXUGO & (*pbits_to_set)); |
| cFYI(DBG2, ("all perms")); |
| return; |
| } |
| if ((flags & GENERIC_WRITE) || |
| ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) |
| *pmode |= (S_IWUGO & (*pbits_to_set)); |
| if ((flags & GENERIC_READ) || |
| ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) |
| *pmode |= (S_IRUGO & (*pbits_to_set)); |
| if ((flags & GENERIC_EXECUTE) || |
| ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) |
| *pmode |= (S_IXUGO & (*pbits_to_set)); |
| |
| cFYI(DBG2, ("access flags 0x%x mode now 0x%x", flags, *pmode)); |
| return; |
| } |
| |
| /* |
| Generate access flags to reflect permissions mode is the existing mode. |
| This function is called for every ACE in the DACL whose SID matches |
| with either owner or group or everyone. |
| */ |
| |
| static void mode_to_access_flags(umode_t mode, umode_t bits_to_use, |
| __u32 *pace_flags) |
| { |
| /* reset access mask */ |
| *pace_flags = 0x0; |
| |
| /* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */ |
| mode &= bits_to_use; |
| |
| /* check for R/W/X UGO since we do not know whose flags |
| is this but we have cleared all the bits sans RWX for |
| either user or group or other as per bits_to_use */ |
| if (mode & S_IRUGO) |
| *pace_flags |= SET_FILE_READ_RIGHTS; |
| if (mode & S_IWUGO) |
| *pace_flags |= SET_FILE_WRITE_RIGHTS; |
| if (mode & S_IXUGO) |
| *pace_flags |= SET_FILE_EXEC_RIGHTS; |
| |
| cFYI(DBG2, ("mode: 0x%x, access flags now 0x%x", mode, *pace_flags)); |
| return; |
| } |
| |
| static __le16 fill_ace_for_sid(struct cifs_ace *pntace, |
| const struct cifs_sid *psid, __u64 nmode, umode_t bits) |
| { |
| int i; |
| __u16 size = 0; |
| __u32 access_req = 0; |
| |
| pntace->type = ACCESS_ALLOWED; |
| pntace->flags = 0x0; |
| mode_to_access_flags(nmode, bits, &access_req); |
| if (!access_req) |
| access_req = SET_MINIMUM_RIGHTS; |
| pntace->access_req = cpu_to_le32(access_req); |
| |
| pntace->sid.revision = psid->revision; |
| pntace->sid.num_subauth = psid->num_subauth; |
| for (i = 0; i < 6; i++) |
| pntace->sid.authority[i] = psid->authority[i]; |
| for (i = 0; i < psid->num_subauth; i++) |
| pntace->sid.sub_auth[i] = psid->sub_auth[i]; |
| |
| size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4); |
| pntace->size = cpu_to_le16(size); |
| |
| return (size); |
| } |
| |
| |
| #ifdef CONFIG_CIFS_DEBUG2 |
| static void dump_ace(struct cifs_ace *pace, char *end_of_acl) |
| { |
| int num_subauth; |
| |
| /* validate that we do not go past end of acl */ |
| |
| if (le16_to_cpu(pace->size) < 16) { |
| cERROR(1, ("ACE too small, %d", le16_to_cpu(pace->size))); |
| return; |
| } |
| |
| if (end_of_acl < (char *)pace + le16_to_cpu(pace->size)) { |
| cERROR(1, ("ACL too small to parse ACE")); |
| return; |
| } |
| |
| num_subauth = pace->sid.num_subauth; |
| if (num_subauth) { |
| int i; |
| cFYI(1, ("ACE revision %d num_auth %d type %d flags %d size %d", |
| pace->sid.revision, pace->sid.num_subauth, pace->type, |
| pace->flags, le16_to_cpu(pace->size))); |
| for (i = 0; i < num_subauth; ++i) { |
| cFYI(1, ("ACE sub_auth[%d]: 0x%x", i, |
| le32_to_cpu(pace->sid.sub_auth[i]))); |
| } |
| |
| /* BB add length check to make sure that we do not have huge |
| num auths and therefore go off the end */ |
| } |
| |
| return; |
| } |
| #endif |
| |
| |
| static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl, |
| struct cifs_sid *pownersid, struct cifs_sid *pgrpsid, |
| struct inode *inode) |
| { |
| int i; |
| int num_aces = 0; |
| int acl_size; |
| char *acl_base; |
| struct cifs_ace **ppace; |
| |
| /* BB need to add parm so we can store the SID BB */ |
| |
| if (!pdacl) { |
| /* no DACL in the security descriptor, set |
| all the permissions for user/group/other */ |
| inode->i_mode |= S_IRWXUGO; |
| return; |
| } |
| |
| /* validate that we do not go past end of acl */ |
| if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) { |
| cERROR(1, ("ACL too small to parse DACL")); |
| return; |
| } |
| |
| cFYI(DBG2, ("DACL revision %d size %d num aces %d", |
| le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size), |
| le32_to_cpu(pdacl->num_aces))); |
| |
| /* 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); |
| |
| acl_base = (char *)pdacl; |
| acl_size = sizeof(struct cifs_acl); |
| |
| num_aces = le32_to_cpu(pdacl->num_aces); |
| if (num_aces > 0) { |
| umode_t user_mask = S_IRWXU; |
| umode_t group_mask = S_IRWXG; |
| umode_t other_mask = S_IRWXO; |
| |
| ppace = kmalloc(num_aces * sizeof(struct cifs_ace *), |
| GFP_KERNEL); |
| |
| /* cifscred->cecount = pdacl->num_aces; |
| cifscred->aces = kmalloc(num_aces * |
| sizeof(struct cifs_ace *), GFP_KERNEL);*/ |
| |
| for (i = 0; i < num_aces; ++i) { |
| ppace[i] = (struct cifs_ace *) (acl_base + acl_size); |
| #ifdef CONFIG_CIFS_DEBUG2 |
| dump_ace(ppace[i], end_of_acl); |
| #endif |
| if (compare_sids(&(ppace[i]->sid), pownersid)) |
| access_flags_to_mode(ppace[i]->access_req, |
| ppace[i]->type, |
| &(inode->i_mode), |
| &user_mask); |
| if (compare_sids(&(ppace[i]->sid), pgrpsid)) |
| access_flags_to_mode(ppace[i]->access_req, |
| ppace[i]->type, |
| &(inode->i_mode), |
| &group_mask); |
| if (compare_sids(&(ppace[i]->sid), &sid_everyone)) |
| access_flags_to_mode(ppace[i]->access_req, |
| ppace[i]->type, |
| &(inode->i_mode), |
| &other_mask); |
| |
| /* memcpy((void *)(&(cifscred->aces[i])), |
| (void *)ppace[i], |
| sizeof(struct cifs_ace)); */ |
| |
| acl_base = (char *)ppace[i]; |
| acl_size = le16_to_cpu(ppace[i]->size); |
| } |
| |
| kfree(ppace); |
| } |
| |
| return; |
| } |
| |
| |
| static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid, |
| struct cifs_sid *pgrpsid, __u64 nmode) |
| { |
| __le16 size = 0; |
| struct cifs_acl *pnndacl; |
| |
| pnndacl = (struct cifs_acl *)((char *)pndacl + sizeof(struct cifs_acl)); |
| |
| size += fill_ace_for_sid((struct cifs_ace *) ((char *)pnndacl + size), |
| pownersid, nmode, S_IRWXU); |
| size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), |
| pgrpsid, nmode, S_IRWXG); |
| size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), |
| &sid_everyone, nmode, S_IRWXO); |
| |
| pndacl->size = cpu_to_le16(size + sizeof(struct cifs_acl)); |
| pndacl->num_aces = 3; |
| |
| return (0); |
| } |
| |
| |
| static int parse_sid(struct cifs_sid *psid, char *end_of_acl) |
| { |
| /* BB need to add parm so we can store the SID BB */ |
| |
| /* validate that we do not go past end of ACL - sid must be at least 8 |
| bytes long (assuming no sub-auths - e.g. the null SID */ |
| if (end_of_acl < (char *)psid + 8) { |
| cERROR(1, ("ACL too small to parse SID %p", psid)); |
| return -EINVAL; |
| } |
| |
| if (psid->num_subauth) { |
| #ifdef CONFIG_CIFS_DEBUG2 |
| int i; |
| cFYI(1, ("SID revision %d num_auth %d", |
| psid->revision, psid->num_subauth)); |
| |
| for (i = 0; i < psid->num_subauth; i++) { |
| cFYI(1, ("SID sub_auth[%d]: 0x%x ", i, |
| le32_to_cpu(psid->sub_auth[i]))); |
| } |
| |
| /* BB add length check to make sure that we do not have huge |
| num auths and therefore go off the end */ |
| cFYI(1, ("RID 0x%x", |
| le32_to_cpu(psid->sub_auth[psid->num_subauth-1]))); |
| #endif |
| } |
| |
| return 0; |
| } |
| |
| |
| /* Convert CIFS ACL to POSIX form */ |
| static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len, |
| struct inode *inode) |
| { |
| int rc; |
| 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; |
| |
| owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
| le32_to_cpu(pntsd->osidoffset)); |
| group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
| le32_to_cpu(pntsd->gsidoffset)); |
| dacloffset = le32_to_cpu(pntsd->dacloffset); |
| dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); |
| cFYI(DBG2, ("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), dacloffset)); |
| /* cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */ |
| rc = parse_sid(owner_sid_ptr, end_of_acl); |
| if (rc) |
| return rc; |
| |
| rc = parse_sid(group_sid_ptr, end_of_acl); |
| if (rc) |
| return rc; |
| |
| 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; |
| memcpy((void *)(&(cifscred->osid)), (void *)owner_sid_ptr, |
| sizeof(struct cifs_sid)); |
| memcpy((void *)(&(cifscred->gsid)), (void *)group_sid_ptr, |
| sizeof(struct cifs_sid)); */ |
| |
| |
| return (0); |
| } |
| |
| |
| /* Convert permission bits from mode to equivalent CIFS ACL */ |
| static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd, |
| int acl_len, struct inode *inode, __u64 nmode) |
| { |
| int rc = 0; |
| __u32 dacloffset; |
| __u32 ndacloffset; |
| __u32 sidsoffset; |
| struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
| struct cifs_acl *dacl_ptr = NULL; /* no need for SACL ptr */ |
| struct cifs_acl *ndacl_ptr = NULL; /* no need for SACL ptr */ |
| |
| if ((inode == NULL) || (pntsd == NULL) || (pnntsd == NULL)) |
| return (-EIO); |
| |
| owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
| le32_to_cpu(pntsd->osidoffset)); |
| group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
| le32_to_cpu(pntsd->gsidoffset)); |
| |
| dacloffset = le32_to_cpu(pntsd->dacloffset); |
| dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); |
| |
| ndacloffset = sizeof(struct cifs_ntsd); |
| ndacl_ptr = (struct cifs_acl *)((char *)pnntsd + ndacloffset); |
| ndacl_ptr->revision = dacl_ptr->revision; |
| ndacl_ptr->size = 0; |
| ndacl_ptr->num_aces = 0; |
| |
| rc = set_chmod_dacl(ndacl_ptr, owner_sid_ptr, group_sid_ptr, nmode); |
| |
| sidsoffset = ndacloffset + le16_to_cpu(ndacl_ptr->size); |
| |
| /* copy security descriptor control portion and owner and group sid */ |
| copy_sec_desc(pntsd, pnntsd, sidsoffset); |
| |
| return (rc); |
| } |
| |
| |
| /* 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; |
| int xid; |
| int rc = -EIO; |
| __u16 fid; |
| struct super_block *sb; |
| struct cifs_sb_info *cifs_sb; |
| struct cifs_ntsd *pntsd = NULL; |
| |
| cFYI(1, ("get mode from ACL for %s", path)); |
| |
| if (inode == NULL) |
| return NULL; |
| |
| xid = GetXid(); |
| open_file = find_readable_file(CIFS_I(inode)); |
| sb = inode->i_sb; |
| if (sb == NULL) { |
| FreeXid(xid); |
| return NULL; |
| } |
| cifs_sb = CIFS_SB(sb); |
| |
| if (open_file) { |
| unlock_file = TRUE; |
| fid = open_file->netfid; |
| } else { |
| int oplock = FALSE; |
| /* open file */ |
| rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN, |
| READ_CONTROL, 0, &fid, &oplock, NULL, |
| cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
| CIFS_MOUNT_MAP_SPECIAL_CHR); |
| if (rc != 0) { |
| cERROR(1, ("Unable to open file to get ACL")); |
| FreeXid(xid); |
| return NULL; |
| } |
| } |
| |
| 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); |
| |
| FreeXid(xid); |
| return pntsd; |
| } |
| |
| /* Set an ACL on the server */ |
| static int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen, |
| struct inode *inode, const char *path) |
| { |
| struct cifsFileInfo *open_file; |
| int unlock_file = FALSE; |
| int xid; |
| int rc = -EIO; |
| __u16 fid; |
| struct super_block *sb; |
| struct cifs_sb_info *cifs_sb; |
| |
| cFYI(DBG2, ("set ACL for %s from mode 0x%x", path, inode->i_mode)); |
| |
| if (!inode) |
| return (rc); |
| |
| sb = inode->i_sb; |
| if (sb == NULL) |
| return (rc); |
| |
| cifs_sb = CIFS_SB(sb); |
| xid = GetXid(); |
| |
| open_file = find_readable_file(CIFS_I(inode)); |
| if (open_file) { |
| unlock_file = TRUE; |
| fid = open_file->netfid; |
| } else { |
| int oplock = FALSE; |
| /* open file */ |
| rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN, |
| WRITE_DAC, 0, &fid, &oplock, NULL, |
| cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
| CIFS_MOUNT_MAP_SPECIAL_CHR); |
| if (rc != 0) { |
| cERROR(1, ("Unable to open file to set ACL")); |
| FreeXid(xid); |
| return (rc); |
| } |
| } |
| |
| rc = CIFSSMBSetCIFSACL(xid, cifs_sb->tcon, fid, pnntsd, acllen); |
| cFYI(DBG2, ("SetCIFSACL rc = %d", rc)); |
| if (unlock_file == TRUE) |
| atomic_dec(&open_file->wrtPending); |
| else |
| CIFSSMBClose(xid, cifs_sb->tcon, fid); |
| |
| FreeXid(xid); |
| |
| return (rc); |
| } |
| |
| /* 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; |
| |
| cFYI(DBG2, ("converting ACL to mode for %s", path)); |
| 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); |
| 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, __u64 nmode) |
| { |
| int rc = 0; |
| __u32 acllen = 0; |
| struct cifs_ntsd *pntsd = NULL; /* acl obtained from server */ |
| struct cifs_ntsd *pnntsd = NULL; /* modified acl to be sent to server */ |
| |
| cFYI(DBG2, ("set ACL from mode for %s", path)); |
| |
| /* Get the security descriptor */ |
| pntsd = get_cifs_acl(&acllen, inode, path); |
| |
| /* Add three ACEs for owner, group, everyone getting rid of |
| other ACEs as chmod disables ACEs and set the security descriptor */ |
| |
| if (pntsd) { |
| /* allocate memory for the smb header, |
| set security descriptor request security descriptor |
| parameters, and secuirty descriptor itself */ |
| |
| pnntsd = kmalloc(acllen, GFP_KERNEL); |
| if (!pnntsd) { |
| cERROR(1, ("Unable to allocate security descriptor")); |
| kfree(pntsd); |
| return (-ENOMEM); |
| } |
| |
| rc = build_sec_desc(pntsd, pnntsd, acllen, inode, nmode); |
| |
| cFYI(DBG2, ("build_sec_desc rc: %d", rc)); |
| |
| if (!rc) { |
| /* Set the security descriptor */ |
| rc = set_cifs_acl(pnntsd, acllen, inode, path); |
| cFYI(DBG2, ("set_cifs_acl rc: %d", rc)); |
| } |
| |
| kfree(pnntsd); |
| kfree(pntsd); |
| } |
| |
| return (rc); |
| } |
| #endif /* CONFIG_CIFS_EXPERIMENTAL */ |