[CIFS] CIFS ACL support (part 2)

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

4 files changed, 151 insertions, 60 deletions

diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
index 9b84f373af19..23bff0128e2a 100644
--- a/fs/cifs/cifsacl.c
+++ b/fs/cifs/cifsacl.c
@@ -24,48 +24,178 @@
 #include <linux/fs.h>
 #include "cifspdu.h"
 #include "cifsglob.h"
+#include "cifsacl.h"
 #include "cifsproto.h"
 #include "cifs_debug.h"
-#include "cifsacl.h"
 
 /* security id for everyone */
 static const struct cifs_sid sid_everyone =
-                {1, 1, {0, 0, 0, 0, 0, 0}, {0, 0, 0, 0}};
+                {1, 1, {0, 0, 0, 0, 0, 0}, {}};
 /* group users */
 static const struct cifs_sid sid_user =
-                {1, 2 , {0, 0, 0, 0, 0, 5}, {32, 545, 0, 0}};
+                {1, 2 , {0, 0, 0, 0, 0, 5}, {}};
+
+static void parse_ace(struct cifs_ace * pace, char * end_of_acl)
+{
+        int i;
+        int num_subauth;
+         __u32 *psub_auth;
+
+        /* validate that we do not go past end of acl */
+        if (end_of_acl < (char *)pace + sizeof(struct cifs_ace)) {
+                cERROR(1, ("ACL too small to parse ACE"));
+                return;
+        }
+
+        num_subauth = cpu_to_le32(pace->num_subauth);
+        if (num_subauth) {
+                psub_auth = (__u32 *)((char *)pace + sizeof(struct cifs_ace));
+#ifdef CONFIG_CIFS_DEBUG2 
+                cFYI(1, ("ACE revision %d num_subauth %d", 
+                        pace->revision, pace->num_subauth)); 
+                for (i = 0; i < num_subauth; ++i) { 
+                        cFYI(1, ("ACE sub_auth[%d]: 0x%x", i, 
+                                le32_to_cpu(psub_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(psub_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)
+{
+        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 */
+
+        /* validate that we do not go past end of acl */
+        if (end_of_acl < (char *)pdacl + pdacl->size) {
+                cERROR(1, ("ACL too small to parse DACL"));
+                return;
+        }
+
+#ifdef CONFIG_CIFS_DEBUG2
+        cFYI(1, ("DACL revision %d size %d num aces %d",
+                pdacl->revision, pdacl->size, pdacl->num_aces));
+#endif
+
+        acl_base = (char *)pdacl;
+        acl_size = sizeof(struct cifs_acl);
+
+        num_aces = cpu_to_le32(pdacl->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 = 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);
+                        parse_ace(ppace[i], end_of_acl);
+
+/*                      memcpy((void *)(&(cifscred->ntaces[i])),
+                                (void *)ppntace[i],
+                                sizeof(struct cifs_ntace));
+                        memcpy((void *)(&(cifscred->aces[i])),
+                                (void *)ppace[i],
+                                sizeof(struct cifs_ace)); */
+
+                        acl_base = (char *)ppntace[i];
+                        acl_size = cpu_to_le32(ppntace[i]->size);
+                }
+
+                kfree(ppace);
+                kfree(ppntace);
+        }
+
+        return;
+}
+
 
 static int parse_sid(struct cifs_sid *psid, char *end_of_acl)
 {
+        int i;
+        int num_subauth;
+        __u32 *psub_auth;
+
         /* 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"));
+                cERROR(1, ("ACL too small to parse SID"));
                 return -EINVAL;
         }
+
+        num_subauth = cpu_to_le32(psid->num_subauth);
+        if (num_subauth) {
+                psub_auth = (__u32 *)((char *)psid + sizeof(struct cifs_sid));
 #ifdef CONFIG_CIFS_DEBUG2
-        cFYI(1, ("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 First subauth 0x%x",
+                        psid->revision, psid->num_subauth, 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_subauth])));
+                for (i = 0; i < num_subauth; ++i) {
+                        cFYI(1, ("SID sub_auth[%d]: 0x%x ", i,
+                        le32_to_cpu(psub_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])));
 #endif
+        }
+
         return 0;
 }
 
+
 /* Convert CIFS ACL to POSIX form */
 int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len)
 {
-        int i, rc;
-        int num_aces = 0;
-        int acl_size;
+        int rc;
         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 +
@@ -89,6 +219,8 @@ int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len)
         if (rc)
                 return rc;
 
+        parse_dacl(dacl_ptr, end_of_acl);
+
 /*      cifscred->uid = owner_sid_ptr->rid;
         cifscred->gid = group_sid_ptr->rid;
         memcpy((void *)(&(cifscred->osid)), (void *)owner_sid_ptr,
@@ -96,46 +228,5 @@ int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len)
         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);
 }
diff --git a/fs/cifs/cifsacl.h b/fs/cifs/cifsacl.h
index 5e7b56738cc5..bf297ea1905a 100644
--- a/fs/cifs/cifsacl.h
+++ b/fs/cifs/cifsacl.h
@@ -44,14 +44,14 @@ struct cifs_acl {
         __u32 num_aces;
 } __attribute__((packed));
 
-struct cifs_ntace {
+struct cifs_ntace { /* first part of ACE which contains perms */
         __u8 type;
         __u8 flags;
         __u16 size;
         __u32 access_req;
 } __attribute__((packed));
 
-struct cifs_ace {
+struct cifs_ace { /* last part of ACE which includes user info */
         __u8 revision; /* revision level */
         __u8 num_subauth;
         __u8 authority[6];
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 7dbb79b8dd50..001f0dc7e60d 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -310,7 +310,7 @@ extern void setup_ntlmv2_rsp(struct cifsSesInfo *, char *,
 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 extern void calc_lanman_hash(struct cifsSesInfo *ses, char *lnm_session_key);
 #endif /* CIFS_WEAK_PW_HASH */
-extern int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len);
+extern int parse_sec_desc(struct cifs_ntsd *, int);
 extern int CIFSSMBCopy(int xid,
                         struct cifsTconInfo *source_tcon,
                         const char *fromName,
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index a6ff324bc135..90b8f8d64d6e 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -34,10 +34,10 @@
 #include <asm/uaccess.h>
 #include "cifspdu.h"
 #include "cifsglob.h"
+#include "cifsacl.h"
 #include "cifsproto.h"
 #include "cifs_unicode.h"
 #include "cifs_debug.h"
-#include "cifsacl.h"
 
 #ifdef CONFIG_CIFS_POSIX
 static struct {