[CIFS] Support for CIFS ACLs (part 1)

Add code to be able to dump CIFS ACL information
when Query Posix ACL with cifsacl mount parm enabled.

Signed-off-by: Shirish Pargoankar <shirishp@us.ibm.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

4 files changed, 143 insertions, 8 deletions

diff --git a/fs/cifs/cifsacl.h b/fs/cifs/cifsacl.h
index 5eff35d6e564..97d03dc8169c 100644
--- a/fs/cifs/cifsacl.h
+++ b/fs/cifs/cifsacl.h
@@ -22,12 +22,42 @@
 #ifndef _CIFSACL_H
 #define _CIFSACL_H
 
+struct cifs_ntsd {
+        __u16 revision; /* revision level */
+        __u16 type;
+        __u32 osidoffset;
+        __u32 gsidoffset;
+        __u32 sacloffset;
+        __u32 dacloffset;
+} __attribute__((packed));
+
 struct cifs_sid {
         __u8 revision; /* revision level */
-        __u8 num_subauths;
+        __u8 num_auth;
+        __u8 authority[6];
+        __u32 sub_auth[4];
+        __u32 rid;
+} __attribute__((packed));
+
+struct cifs_acl {
+        __u16 revision; /* revision level */
+        __u16 size;
+        __u32 num_aces;
+} __attribute__((packed));
+
+struct cifs_ntace {
+        __u8 type;
+        __u8 flags;
+        __u16 size;
+        __u32 access_req;
+} __attribute__((packed));
+
+struct cifs_ace {
+        __u8 revision; /* revision level */
+        __u8 num_auth;
         __u8 authority[6];
         __u32 sub_auth[4];
-        /* next sub_auth if any ... */
+        __u32 rid;
 } __attribute__((packed));
 
 /* everyone */
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index b98742fc3b5a..bb468de4f474 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -19,6 +19,7 @@
 #include <linux/in.h>
 #include <linux/in6.h>
 #include "cifs_fs_sb.h"
+#include "cifsacl.h"
 /*
  * The sizes of various internal tables and strings
  */
@@ -115,6 +116,17 @@ struct mac_key {
         } data;
 };
 
+struct cifs_cred {
+        int uid;
+        int gid;
+        int mode;
+        int cecount;
+        struct cifs_sid osid;
+        struct cifs_sid gsid;
+        struct cifs_ntace *ntaces;
+        struct cifs_ace *aces;
+};
+
 /*
  *****************************************************************
  * Except the CIFS PDUs themselves all the
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index f33c89c36039..46c2bb455124 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -3048,17 +3048,110 @@ static const struct cifs_sid sid_everyone =
 static const struct cifs_sid sid_user =
                 {1, 2 , {0, 0, 0, 0, 0, 5}, {32, 545, 0, 0}};
 
+static void 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 to small to parse SID"));
+                return;
+        }
+#ifdef CONFIG_CIFS_DEBUG2
+        cFYI(1, ("revision %d num_auth %d First subauth 0x%x",
+                psid->revision, psid->num_auth, psid->sub_auth[0]));
+
+        /* 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_auth])));
+#endif
+        return;
+}
+
 /* Convert CIFS ACL to POSIX form */
-static int parse_sec_desc(struct cifs_sid *psec_desc, int acl_len)
+static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len)
 {
-        return 0;
+        int i;
+        int num_aces = 0;
+        int acl_size;
+        struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
+        struct cifs_acl *dacl_ptr; /* no need for SACL ptr */
+        struct cifs_ntace **ppntace;
+        struct cifs_ace **ppace;
+        char *acl_base;
+        char *end_of_acl = ((char *)pntsd) + acl_len;
+
+        owner_sid_ptr = (struct cifs_sid *)((char *)pntsd +
+                                cpu_to_le32(pntsd->osidoffset));
+        group_sid_ptr = (struct cifs_sid *)((char *)pntsd +
+                                cpu_to_le32(pntsd->gsidoffset));
+        dacl_ptr = (struct cifs_acl *)((char *)pntsd +
+                                cpu_to_le32(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,
+                pntsd->osidoffset, pntsd->gsidoffset, pntsd->sacloffset,
+                pntsd->dacloffset));
+#endif
+        parse_sid(owner_sid_ptr, end_of_acl);
+        parse_sid(group_sid_ptr, end_of_acl);
+
+/*      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)); */
+
+        num_aces = cpu_to_le32(dacl_ptr->num_aces);
+        cFYI(1, ("num aces %d", num_aces));
+        if (num_aces  > 0) {
+                ppntace = kmalloc(num_aces * sizeof(struct cifs_ntace *),
+                                GFP_KERNEL);
+                ppace = kmalloc(num_aces * sizeof(struct cifs_ace *),
+                                GFP_KERNEL);
+
+/*              cifscred->cecount = dacl_ptr->num_aces;
+                cifscred->ntaces = kmalloc(num_aces *
+                                sizeof(struct cifs_ntace *), GFP_KERNEL);
+                cifscred->aces = kmalloc(num_aces *
+                                sizeof(struct cifs_ace *), GFP_KERNEL);*/
+
+                acl_base = (char *)dacl_ptr;
+                acl_size = sizeof(struct cifs_acl);
+
+                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));
+
+/*                      memcpy((void *)(&(cifscred->ntaces[i])),
+                                (void *)ntace_ptrptr[i],
+                                sizeof(struct cifs_ntace));
+                        memcpy((void *)(&(cifscred->aces[i])),
+                                (void *)ace_ptrptr[i],
+                                sizeof(struct cifs_ace)); */
+
+                        acl_base = (char *)ppntace[i];
+                        acl_size = cpu_to_le32(ppntace[i]->size);
+#ifdef CONFIG_CIFS_DEBUG2
+                        cFYI(1, ("ACE revision:%d", ppace[i]->revision));
+                }
+#endif
+                kfree(ppace);
+                kfree(ppntace);
+        }
+
+        return (0);
 }
 
 /* Get Security Descriptor (by handle) from remote server for a file or dir */
 int
 CIFSSMBGetCIFSACL(const int xid, struct cifsTconInfo *tcon, __u16 fid,
                 /* BB fix up return info */ char *acl_inf, const int buflen,
-                  const int acl_type /* ACCESS/DEFAULT not sure implication */)
+                  const int acl_type)
 {
         int rc = 0;
         int buf_type = 0;
@@ -3088,7 +3181,7 @@ CIFSSMBGetCIFSACL(const int xid, struct cifsTconInfo *tcon, __u16 fid,
         if (rc) {
                 cFYI(1, ("Send error in QuerySecDesc = %d", rc));
         } else {                /* decode response */
-                struct cifs_sid *psec_desc;
+                struct cifs_ntsd *psec_desc;
                 __le32 * parm;
                 int parm_len;
                 int data_len;
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 5c3cc6487e59..e43cb880f54a 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1742,9 +1742,9 @@ void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
                         cFYI(1, ("very large write cap"));
 #endif /* CIFS_DEBUG2 */
                 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
-                        if (vol_info == NULL)
+                        if (vol_info == NULL) {
                                 cFYI(1, ("resetting capabilities failed"));
-                        else
+                        } else
                                 cERROR(1, ("Negotiating Unix capabilities "
                                            "with the server failed.  Consider "
                                            "mounting with the Unix Extensions\n"