aboutsummaryrefslogtreecommitdiff
path: root/fs/cifs/cifsacl.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/cifs/cifsacl.c')
-rw-r--r--fs/cifs/cifsacl.c346
1 files changed, 272 insertions, 74 deletions
diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
index e8e56353f5a..dabbce00712 100644
--- a/fs/cifs/cifsacl.c
+++ b/fs/cifs/cifsacl.c
@@ -38,13 +38,13 @@ static struct cifs_wksid wksidarr[NUM_WK_SIDS] = {
{{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"}
-};
+ {{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, 0}, {} };
+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}, {} };
@@ -97,7 +97,7 @@ int match_sid(struct cifs_sid *ctsid)
/* 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(struct cifs_sid *ctsid, struct cifs_sid *cwsid)
+int compare_sids(const struct cifs_sid *ctsid, const struct cifs_sid *cwsid)
{
int i;
int num_subauth, num_sat, num_saw;
@@ -129,66 +129,142 @@ int compare_sids(struct cifs_sid *ctsid, struct cifs_sid *cwsid)
return (1); /* sids compare/match */
}
+/*
+ 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(__u32 ace_flags, int type, umode_t *pmode,
+ umode_t *pbits_to_set)
+{
+ /* 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 (ace_flags & GENERIC_ALL) {
+ *pbits_to_set &= ~S_IRWXUGO;
+ }
+ if ((ace_flags & GENERIC_WRITE) ||
+ ((ace_flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS))
+ *pbits_to_set &= ~S_IWUGO;
+ if ((ace_flags & GENERIC_READ) ||
+ ((ace_flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS))
+ *pbits_to_set &= ~S_IRUGO;
+ if ((ace_flags & GENERIC_EXECUTE) ||
+ ((ace_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 (ace_flags & GENERIC_ALL) {
+ *pmode |= (S_IRWXUGO & (*pbits_to_set));
+#ifdef CONFIG_CIFS_DEBUG2
+ cFYI(1, ("all perms"));
+#endif
+ return;
+ }
+ if ((ace_flags & GENERIC_WRITE) ||
+ ((ace_flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS))
+ *pmode |= (S_IWUGO & (*pbits_to_set));
+ if ((ace_flags & GENERIC_READ) ||
+ ((ace_flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS))
+ *pmode |= (S_IRUGO & (*pbits_to_set));
+ if ((ace_flags & GENERIC_EXECUTE) ||
+ ((ace_flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS))
+ *pmode |= (S_IXUGO & (*pbits_to_set));
+
+#ifdef CONFIG_CIFS_DEBUG2
+ cFYI(1, ("access flags 0x%x mode now 0x%x", ace_flags, *pmode));
+#endif
+ 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;
+
+#ifdef CONFIG_CIFS_DEBUG2
+ cFYI(1, ("mode: 0x%x, access flags now 0x%x", mode, *pace_flags));
+#endif
+ return;
+}
+
-static void parse_ace(struct cifs_ace *pace, char *end_of_acl)
+#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 */
- /* XXX this if statement can be removed
- if (end_of_acl < (char *)pace + sizeof(struct cifs_ace)) {
+ 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->num_subauth;
+ num_subauth = pace->sid.num_subauth;
if (num_subauth) {
-#ifdef CONFIG_CIFS_DEBUG2
int i;
- cFYI(1, ("ACE revision %d num_subauth %d",
- pace->revision, pace->num_subauth));
+ 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, pace->size));
for (i = 0; i < num_subauth; ++i) {
cFYI(1, ("ACE sub_auth[%d]: 0x%x", i,
- le32_to_cpu(pace->sub_auth[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 */
-
- cFYI(1, ("RID %d", le32_to_cpu(pace->sub_auth[num_subauth-1])));
-#endif
}
return;
}
-
-static void parse_ntace(struct cifs_ntace *pntace, char *end_of_acl)
-{
- /* validate that we do not go past end of acl */
- if (end_of_acl < (char *)pntace + sizeof(struct cifs_ntace)) {
- cERROR(1, ("ACL too small to parse NT ACE"));
- return;
- }
-
-#ifdef CONFIG_CIFS_DEBUG2
- cFYI(1, ("NTACE type %d flags 0x%x size %d, access Req 0x%x",
- pntace->type, pntace->flags, pntace->size,
- pntace->access_req));
#endif
- return;
-}
-
static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl,
- struct cifs_sid *pownersid, struct cifs_sid *pgrpsid)
+ 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_ntace **ppntace;
struct cifs_ace **ppace;
/* BB need to add parm so we can store the SID BB */
@@ -205,50 +281,63 @@ 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);
num_aces = le32_to_cpu(pdacl->num_aces);
if (num_aces > 0) {
- ppntace = kmalloc(num_aces * sizeof(struct cifs_ntace *),
- GFP_KERNEL);
+ 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->ntaces = kmalloc(num_aces *
- sizeof(struct cifs_ntace *), GFP_KERNEL);
cifscred->aces = kmalloc(num_aces *
sizeof(struct cifs_ace *), GFP_KERNEL);*/
for (i = 0; i < num_aces; ++i) {
- ppntace[i] = (struct cifs_ntace *)
- (acl_base + acl_size);
- ppace[i] = (struct cifs_ace *) ((char *)ppntace[i] +
- sizeof(struct cifs_ntace));
-
- parse_ntace(ppntace[i], end_of_acl);
- if (end_of_acl < ((char *)ppace[i] +
- (le16_to_cpu(ppntace[i]->size) -
- sizeof(struct cifs_ntace)))) {
- cERROR(1, ("ACL too small to parse ACE"));
- break;
- } else
- parse_ace(ppace[i], end_of_acl);
-
-/* memcpy((void *)(&(cifscred->ntaces[i])),
- (void *)ppntace[i],
- sizeof(struct cifs_ntace));
- memcpy((void *)(&(cifscred->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 *)ppntace[i];
- acl_size = le16_to_cpu(ppntace[i]->size);
+ acl_base = (char *)ppace[i];
+ acl_size = le16_to_cpu(ppace[i]->size);
}
kfree(ppace);
- kfree(ppntace);
}
return;
@@ -257,20 +346,20 @@ static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl,
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 */
- if (end_of_acl < (char *)psid + sizeof(struct cifs_sid)) {
- cERROR(1, ("ACL too small to parse SID"));
+ /* 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 First subauth 0x%x",
- psid->revision, psid->num_subauth, psid->sub_auth[0]));
+ 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,
@@ -289,27 +378,32 @@ static int parse_sid(struct cifs_sid *psid, char *end_of_acl)
/* Convert CIFS ACL to POSIX form */
-int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len)
+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));
- 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);
if (rc)
return rc;
@@ -318,16 +412,120 @@ 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);
+ 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));
+ sizeof(struct cifs_sid));
memcpy((void *)(&(cifscred->gsid)), (void *)group_sid_ptr,
- sizeof (struct cifs_sid)); */
+ sizeof(struct cifs_sid)); */
return (0);
}
+
+
+/* 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;
+}
+
+/* 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);
+ 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;
+ __u32 acllen = 0;
+ struct cifs_ntsd *pntsd = NULL;
+
+ 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
+ while retaining the other ACEs */
+
+ /* Set the security descriptor */
+
+
+ kfree(pntsd);
+ return rc;
+}
#endif /* CONFIG_CIFS_EXPERIMENTAL */
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-12 00:54:01 +0000