[CIFS] Add worker function for Get ACL cifs style

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

1 files changed, 176 insertions, 3 deletions

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 1620991cd4d2..20300bc9ae77 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -1926,6 +1926,90 @@ querySymLinkRetry:
         return rc;
 }
 
+/* Initialize NT TRANSACT SMB into small smb request buffer.
+   This assumes that all NT TRANSACTS that we init here have
+   total parm and data under about 400 bytes (to fit in small cifs
+   buffer size), which is the case so far, it easily fits. NB:
+        Setup words themselves and ByteCount
+        MaxSetupCount (size of returned setup area) and
+        MaxParameterCount (returned parms size) must be set by caller */
+static int 
+smb_init_ntransact(const __u16 sub_command, const int setup_count,
+                   const int parm_len, struct cifsTconInfo *tcon,
+                   void ** ret_buf)
+{
+        int rc;
+        __u32 temp_offset;
+        struct smb_com_ntransact_req * pSMB;
+
+        rc = small_smb_init(SMB_COM_NT_TRANSACT, 19 + setup_count, tcon,
+                                (void **)&pSMB);
+        if (rc)
+                return rc;
+        *ret_buf = (void *)pSMB;
+        pSMB->Reserved = 0;
+        pSMB->TotalParameterCount = cpu_to_le32(parm_len);
+        pSMB->TotalDataCount  = 0;
+        pSMB->MaxDataCount = cpu_to_le32((tcon->ses->server->maxBuf -
+                                          MAX_CIFS_HDR_SIZE) & 0xFFFFFF00);
+        pSMB->ParameterCount = pSMB->TotalParameterCount;
+        pSMB->DataCount  = pSMB->TotalDataCount;
+        temp_offset = offsetof(struct smb_com_ntransact_req, Parms) +
+                        (setup_count * 2) - 4 /* for rfc1001 length itself */;
+        pSMB->ParameterOffset = cpu_to_le32(temp_offset);
+        pSMB->DataOffset = cpu_to_le32(temp_offset + parm_len);
+        pSMB->SetupCount = setup_count; /* no need to le convert byte fields */
+        pSMB->SubCommand = cpu_to_le16(sub_command);
+        return 0;
+}
+
+static int
+validate_ntransact(char * buf, char ** ppparm, char ** ppdata,
+                   int * pdatalen, int * pparmlen)
+{
+        char * end_of_smb;
+        __u32 data_count, data_offset, parm_count, parm_offset;
+        struct smb_com_ntransact_rsp * pSMBr;
+
+        if(buf == NULL)
+                return -EINVAL;
+
+        pSMBr = (struct smb_com_ntransact_rsp *)buf;
+
+        /* ByteCount was converted from little endian in SendReceive */
+        end_of_smb = 2 /* sizeof byte count */ + pSMBr->ByteCount + 
+                        (char *)&pSMBr->ByteCount;
+
+                
+        data_offset = le32_to_cpu(pSMBr->DataOffset);
+        data_count = le32_to_cpu(pSMBr->DataCount);
+        parm_offset = le32_to_cpu(pSMBr->ParameterOffset);
+        parm_count = le32_to_cpu(pSMBr->ParameterCount);
+
+        *ppparm = (char *)&pSMBr->hdr.Protocol + parm_offset;
+        *ppdata = (char *)&pSMBr->hdr.Protocol + data_offset;
+
+        /* should we also check that parm and data areas do not overlap? */
+        if(*ppparm > end_of_smb) {
+                cFYI(1,("parms start after end of smb"));
+                return -EINVAL;
+        } else if(parm_count + *ppparm > end_of_smb) {
+                cFYI(1,("parm end after end of smb"));
+                return -EINVAL;
+        } else if(*ppdata > end_of_smb) {
+                cFYI(1,("data starts after end of smb"));
+                return -EINVAL;
+        } else if(data_count + *ppdata > end_of_smb) {
+                cFYI(1,("data %p + count %d (%p) ends after end of smb %p start %p",
+                        *ppdata, data_count, (data_count + *ppdata), end_of_smb, pSMBr));  /* BB FIXME */
+                return -EINVAL;
+        } else if(parm_count + data_count > pSMBr->ByteCount) {
+                cFYI(1,("parm count and data count larger than SMB"));
+                return -EINVAL;
+        }
+        return 0;
+}
+
 int
 CIFSSMBQueryReparseLinkInfo(const int xid, struct cifsTconInfo *tcon,
                         const unsigned char *searchName,
@@ -1948,7 +2032,8 @@ CIFSSMBQueryReparseLinkInfo(const int xid, struct cifsTconInfo *tcon,
         pSMB->TotalDataCount = 0;
         pSMB->MaxParameterCount = cpu_to_le32(2);
         /* BB find exact data count max from sess structure BB */
-        pSMB->MaxDataCount = cpu_to_le32(4000);
+        pSMB->MaxDataCount = cpu_to_le32((tcon->ses->server->maxBuf -
+                                          MAX_CIFS_HDR_SIZE) & 0xFFFFFF00);
         pSMB->MaxSetupCount = 4;
         pSMB->Reserved = 0;
         pSMB->ParameterOffset = 0;
@@ -1975,7 +2060,9 @@ CIFSSMBQueryReparseLinkInfo(const int xid, struct cifsTconInfo *tcon,
                         rc = -EIO;      /* bad smb */
                 else {
                         if(data_count && (data_count < 2048)) {
-                                char * end_of_smb = pSMBr->ByteCount + (char *)&pSMBr->ByteCount;
+                                char * end_of_smb = 2 /* sizeof byte count */ +
+                                                pSMBr->ByteCount +
+                                                (char *)&pSMBr->ByteCount;
 
                                 struct reparse_data * reparse_buf = (struct reparse_data *)
                                         ((char *)&pSMBr->hdr.Protocol + data_offset);
@@ -2219,6 +2306,7 @@ queryAclRetry:
 
         rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                 (struct smb_hdr *) pSMBr, &bytes_returned, 0);
+        cifs_stats_inc(&tcon->num_acl_get);
         if (rc) {
                 cFYI(1, ("Send error in Query POSIX ACL = %d", rc));
         } else {
@@ -2406,6 +2494,87 @@ GetExtAttrOut:
 
 #endif /* CONFIG_POSIX */
 
+/* Convert CIFS ACL to POSIX form */
+static int parse_sec_desc(struct sec_desc * psec_desc, int acl_len)
+{
+        CHECK ON OTHER COMPUTER TO SEE IF FORMAT ENCODED IN CIFSPDU.H ALREADY
+        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 */)
+{
+        int rc = 0;
+        int buf_type = 0;
+        QUERY_SEC_DESC_REQ * pSMB;
+        struct kvec iov[1];
+
+        cFYI(1, ("GetCifsACL"));
+
+        rc = smb_init_ntransact(NT_TRANSACT_QUERY_SECURITY_DESC, 0, 
+                        8 /* parm len */, tcon, (void **) &pSMB);
+        if (rc)
+                return rc;
+
+        pSMB->MaxParameterCount = cpu_to_le32(4);
+        /* BB TEST with big acls that might need to be e.g. larger than 16K */
+        pSMB->MaxSetupCount = 0;
+        pSMB->Fid = fid; /* file handle always le */
+        pSMB->AclFlags = cpu_to_le32(CIFS_ACL_OWNER | CIFS_ACL_GROUP |
+                                     CIFS_ACL_DACL);
+        pSMB->ByteCount = cpu_to_le16(11); /* 3 bytes pad + 8 bytes parm */
+        pSMB->hdr.smb_buf_length += 11;
+        iov[0].iov_base = (char *)pSMB;
+        iov[0].iov_len = pSMB->hdr.smb_buf_length + 4;
+
+        rc = SendReceive2(xid, tcon->ses, iov, 1 /* num iovec */, &buf_type, 0);
+        cifs_stats_inc(&tcon->num_acl_get);
+        if (rc) {
+                cFYI(1, ("Send error in QuerySecDesc = %d", rc));
+        } else {                /* decode response */
+                struct sec_desc * psec_desc;
+                __le32 * parm;
+                int parm_len;
+                int data_len;
+                int acl_len;
+                struct smb_com_ntransact_rsp * pSMBr;
+
+/* validate_nttransact */
+                rc = validate_ntransact(iov[0].iov_base, (char **)&parm, 
+                                        (char **)&psec_desc,
+                                        &parm_len, &data_len);
+                
+                if(rc)
+                        goto qsec_out;
+                pSMBr = (struct smb_com_ntransact_rsp *)iov[0].iov_base;
+
+                cERROR(1,("smb %p parm %p data %p",pSMBr,parm,psec_desc));  /* BB removeme BB */
+
+                if (le32_to_cpu(pSMBr->ParameterCount) != 4) {
+                        rc = -EIO;      /* bad smb */
+                        goto qsec_out;
+                }
+
+/* BB check that data area is minimum length and as big as acl_len */
+
+                acl_len = le32_to_cpu(*(__le32 *)parm);
+                /* BB check if(acl_len > bufsize) */
+
+                parse_sec_desc(psec_desc, acl_len);
+        }
+qsec_out:
+        if(buf_type == CIFS_SMALL_BUFFER)
+                cifs_small_buf_release(iov[0].iov_base);
+        else if(buf_type == CIFS_LARGE_BUFFER)
+                cifs_buf_release(iov[0].iov_base);
+        cifs_small_buf_release(pSMB);
+        return rc;
+}
+
+
 /* Legacy Query Path Information call for lookup to old servers such
    as Win9x/WinME */
 int SMBQueryInformation(const int xid, struct cifsTconInfo *tcon,
@@ -4304,7 +4473,7 @@ int CIFSSMBNotify(const int xid, struct cifsTconInfo *tcon,
 {
         int rc = 0;
         struct smb_com_transaction_change_notify_req * pSMB = NULL;
-        struct smb_com_transaction_change_notify_rsp * pSMBr = NULL;
+        struct smb_com_ntransaction_change_notify_rsp * pSMBr = NULL;
         struct dir_notify_req *dnotify_req;
         int bytes_returned;
 
@@ -4319,6 +4488,10 @@ int CIFSSMBNotify(const int xid, struct cifsTconInfo *tcon,
         pSMB->MaxParameterCount = cpu_to_le32(2);
         /* BB find exact data count max from sess structure BB */
         pSMB->MaxDataCount = 0; /* same in little endian or be */
+/* BB VERIFY verify which is correct for above BB */
+        pSMB->MaxDataCount = cpu_to_le32((tcon->ses->server->maxBuf -
+                                             MAX_CIFS_HDR_SIZE) & 0xFFFFFF00);
+
         pSMB->MaxSetupCount = 4;
         pSMB->Reserved = 0;
         pSMB->ParameterOffset = 0;