cifs: Separate rawntlmssp auth from CIFS_SessSetup()
Separate rawntlmssp authentication from CIFS_SessSetup(). Also cleanup CIFS_SessSetup() since we no longer do any auth within it. Signed-off-by: Sachin Prabhu <sprabhu@redhat.com> Reviewed-by: Shirish Pargaonkar <spargaonkar@suse.com> Signed-off-by: Steve French <smfrench@gmail.com>hifive-unleashed-5.1
Sachin Prabhu
Steve French
parent
ee03c646dd
commit
cc87c47d9d
566
fs/cifs/sess.c
566
fs/cifs/sess.c
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@ -1113,39 +1113,262 @@ sess_auth_kerberos(struct sess_data *sess_data)
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}
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#endif /* ! CONFIG_CIFS_UPCALL */
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int
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CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
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const struct nls_table *nls_cp)
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/*
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* The required kvec buffers have to be allocated before calling this
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* function.
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*/
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static int
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_sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
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{
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int rc = 0;
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int wct;
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struct smb_hdr *smb_buf;
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char *bcc_ptr;
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char *str_area;
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SESSION_SETUP_ANDX *pSMB;
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struct cifs_ses *ses = sess_data->ses;
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__u32 capabilities;
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__u16 count;
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int resp_buf_type;
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struct kvec iov[3];
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enum securityEnum type;
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__u16 action, bytes_remaining;
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__le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
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u16 blob_len;
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char *ntlmsspblob = NULL;
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struct sess_data *sess_data;
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char *bcc_ptr;
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if (ses == NULL) {
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WARN(1, "%s: ses == NULL!", __func__);
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return -EINVAL;
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pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
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smb_buf = (struct smb_hdr *)pSMB;
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capabilities = cifs_ssetup_hdr(ses, pSMB);
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if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
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cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
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return -ENOSYS;
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}
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sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
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if (!sess_data)
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return -ENOMEM;
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sess_data->xid = xid;
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sess_data->ses = ses;
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sess_data->buf0_type = CIFS_NO_BUFFER;
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sess_data->nls_cp = (struct nls_table *) nls_cp;
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pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
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capabilities |= CAP_EXTENDED_SECURITY;
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pSMB->req.Capabilities |= cpu_to_le32(capabilities);
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bcc_ptr = sess_data->iov[2].iov_base;
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/* unicode strings must be word aligned */
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if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
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*bcc_ptr = 0;
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bcc_ptr++;
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}
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unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
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sess_data->iov[2].iov_len = (long) bcc_ptr -
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(long) sess_data->iov[2].iov_base;
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return 0;
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}
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static void
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sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
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static void
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sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
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{
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int rc;
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struct smb_hdr *smb_buf;
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SESSION_SETUP_ANDX *pSMB;
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struct cifs_ses *ses = sess_data->ses;
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__u16 bytes_remaining;
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char *bcc_ptr;
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u16 blob_len;
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cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
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/*
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* if memory allocation is successful, caller of this function
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* frees it.
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*/
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ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
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if (!ses->ntlmssp) {
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rc = -ENOMEM;
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goto out;
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}
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ses->ntlmssp->sesskey_per_smbsess = false;
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/* wct = 12 */
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rc = sess_alloc_buffer(sess_data, 12);
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if (rc)
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goto out;
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pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
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/* Build security blob before we assemble the request */
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build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
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sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
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sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
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pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
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rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
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if (rc)
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goto out;
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rc = sess_sendreceive(sess_data);
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pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
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smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
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/* If true, rc here is expected and not an error */
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if (sess_data->buf0_type != CIFS_NO_BUFFER &&
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smb_buf->Status.CifsError ==
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cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
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rc = 0;
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if (rc)
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goto out;
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cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
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if (smb_buf->WordCount != 4) {
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rc = -EIO;
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cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
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goto out;
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}
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ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
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cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
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bytes_remaining = get_bcc(smb_buf);
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bcc_ptr = pByteArea(smb_buf);
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blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
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if (blob_len > bytes_remaining) {
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cifs_dbg(VFS, "bad security blob length %d\n",
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blob_len);
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rc = -EINVAL;
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goto out;
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}
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rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
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out:
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sess_free_buffer(sess_data);
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if (!rc) {
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sess_data->func = sess_auth_rawntlmssp_authenticate;
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return;
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}
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/* Else error. Cleanup */
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kfree(ses->auth_key.response);
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ses->auth_key.response = NULL;
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kfree(ses->ntlmssp);
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ses->ntlmssp = NULL;
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sess_data->func = NULL;
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sess_data->result = rc;
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}
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static void
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sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
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{
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int rc;
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struct smb_hdr *smb_buf;
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SESSION_SETUP_ANDX *pSMB;
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struct cifs_ses *ses = sess_data->ses;
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__u16 bytes_remaining;
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char *bcc_ptr;
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char *ntlmsspblob = NULL;
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u16 blob_len;
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cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
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/* wct = 12 */
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rc = sess_alloc_buffer(sess_data, 12);
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if (rc)
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goto out;
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/* Build security blob before we assemble the request */
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pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
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smb_buf = (struct smb_hdr *)pSMB;
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/*
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* 5 is an empirical value, large enough to hold
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* authenticate message plus max 10 of av paris,
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* domain, user, workstation names, flags, etc.
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*/
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ntlmsspblob = kzalloc(5*sizeof(struct _AUTHENTICATE_MESSAGE),
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GFP_KERNEL);
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if (!ntlmsspblob) {
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rc = -ENOMEM;
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goto out;
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}
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rc = build_ntlmssp_auth_blob(ntlmsspblob,
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&blob_len, ses, sess_data->nls_cp);
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if (rc)
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goto out_free_ntlmsspblob;
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sess_data->iov[1].iov_len = blob_len;
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sess_data->iov[1].iov_base = ntlmsspblob;
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pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
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/*
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* Make sure that we tell the server that we are using
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* the uid that it just gave us back on the response
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* (challenge)
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*/
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smb_buf->Uid = ses->Suid;
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rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
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if (rc)
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goto out_free_ntlmsspblob;
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rc = sess_sendreceive(sess_data);
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if (rc)
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goto out_free_ntlmsspblob;
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pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
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smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
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if (smb_buf->WordCount != 4) {
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rc = -EIO;
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cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
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goto out_free_ntlmsspblob;
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}
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if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
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cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
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bytes_remaining = get_bcc(smb_buf);
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bcc_ptr = pByteArea(smb_buf);
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blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
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if (blob_len > bytes_remaining) {
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cifs_dbg(VFS, "bad security blob length %d\n",
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blob_len);
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rc = -EINVAL;
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goto out_free_ntlmsspblob;
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}
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bcc_ptr += blob_len;
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bytes_remaining -= blob_len;
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/* BB check if Unicode and decode strings */
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if (bytes_remaining == 0) {
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/* no string area to decode, do nothing */
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} else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
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/* unicode string area must be word-aligned */
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if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
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++bcc_ptr;
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--bytes_remaining;
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}
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decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
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sess_data->nls_cp);
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} else {
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decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
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sess_data->nls_cp);
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}
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out_free_ntlmsspblob:
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kfree(ntlmsspblob);
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out:
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sess_free_buffer(sess_data);
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if (!rc)
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rc = sess_establish_session(sess_data);
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/* Cleanup */
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kfree(ses->auth_key.response);
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ses->auth_key.response = NULL;
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kfree(ses->ntlmssp);
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ses->ntlmssp = NULL;
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sess_data->func = NULL;
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sess_data->result = rc;
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}
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int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
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{
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int type;
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type = select_sectype(ses->server, ses->sectype);
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cifs_dbg(FYI, "sess setup type %d\n", type);
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@ -1157,261 +1380,74 @@ CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
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switch (type) {
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case LANMAN:
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sess_auth_lanman(sess_data);
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goto out;
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/* LANMAN and plaintext are less secure and off by default.
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* So we make this explicitly be turned on in kconfig (in the
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* build) and turned on at runtime (changed from the default)
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* in proc/fs/cifs or via mount parm. Unfortunately this is
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* needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
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#ifdef CONFIG_CIFS_WEAK_PW_HASH
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sess_data->func = sess_auth_lanman;
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break;
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#else
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return -EOPNOTSUPP;
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#endif
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case NTLM:
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sess_auth_ntlm(sess_data);
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goto out;
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sess_data->func = sess_auth_ntlm;
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break;
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case NTLMv2:
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sess_auth_ntlmv2(sess_data);
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goto out;
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sess_data->func = sess_auth_ntlmv2;
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break;
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case Kerberos:
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sess_auth_kerberos(sess_data);
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goto out;
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#ifdef CONFIG_CIFS_UPCALL
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sess_data->func = sess_auth_kerberos;
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break;
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#else
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cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
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return -ENOSYS;
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break;
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#endif /* CONFIG_CIFS_UPCALL */
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case RawNTLMSSP:
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sess_data->func = sess_auth_rawntlmssp_negotiate;
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break;
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default:
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cifs_dbg(FYI, "Continuing with CIFS_SessSetup\n");
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}
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if (type == RawNTLMSSP) {
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/* if memory allocation is successful, caller of this function
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* frees it.
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*/
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ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
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if (!ses->ntlmssp)
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return -ENOMEM;
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ses->ntlmssp->sesskey_per_smbsess = false;
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}
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ssetup_ntlmssp_authenticate:
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if (phase == NtLmChallenge)
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phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
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/* same size: negotiate or auth, NTLMSSP or extended security */
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wct = 12;
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rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
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(void **)&smb_buf);
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if (rc)
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return rc;
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pSMB = (SESSION_SETUP_ANDX *)smb_buf;
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capabilities = cifs_ssetup_hdr(ses, pSMB);
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/* we will send the SMB in three pieces:
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a fixed length beginning part, an optional
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SPNEGO blob (which can be zero length), and a
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last part which will include the strings
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and rest of bcc area. This allows us to avoid
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a large buffer 17K allocation */
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iov[0].iov_base = (char *)pSMB;
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iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
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/* setting this here allows the code at the end of the function
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to free the request buffer if there's an error */
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resp_buf_type = CIFS_SMALL_BUFFER;
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/* 2000 big enough to fit max user, domain, NOS name etc. */
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str_area = kmalloc(2000, GFP_KERNEL);
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if (str_area == NULL) {
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rc = -ENOMEM;
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goto ssetup_exit;
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}
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bcc_ptr = str_area;
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iov[1].iov_base = NULL;
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iov[1].iov_len = 0;
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if (type == RawNTLMSSP) {
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if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
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cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
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rc = -ENOSYS;
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goto ssetup_exit;
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}
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cifs_dbg(FYI, "ntlmssp session setup phase %d\n", phase);
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pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
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capabilities |= CAP_EXTENDED_SECURITY;
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pSMB->req.Capabilities |= cpu_to_le32(capabilities);
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switch(phase) {
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case NtLmNegotiate:
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build_ntlmssp_negotiate_blob(
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pSMB->req.SecurityBlob, ses);
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iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
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iov[1].iov_base = pSMB->req.SecurityBlob;
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pSMB->req.SecurityBlobLength =
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cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
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break;
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case NtLmAuthenticate:
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/*
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* 5 is an empirical value, large enough to hold
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* authenticate message plus max 10 of av paris,
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* domain, user, workstation names, flags, etc.
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*/
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ntlmsspblob = kzalloc(
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5*sizeof(struct _AUTHENTICATE_MESSAGE),
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GFP_KERNEL);
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if (!ntlmsspblob) {
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rc = -ENOMEM;
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goto ssetup_exit;
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}
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rc = build_ntlmssp_auth_blob(ntlmsspblob,
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&blob_len, ses, nls_cp);
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if (rc)
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goto ssetup_exit;
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iov[1].iov_len = blob_len;
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iov[1].iov_base = ntlmsspblob;
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pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
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/*
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* Make sure that we tell the server that we are using
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* the uid that it just gave us back on the response
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* (challenge)
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*/
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smb_buf->Uid = ses->Suid;
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break;
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default:
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cifs_dbg(VFS, "invalid phase %d\n", phase);
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rc = -ENOSYS;
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goto ssetup_exit;
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}
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/* unicode strings must be word aligned */
|
||||
if ((iov[0].iov_len + iov[1].iov_len) % 2) {
|
||||
*bcc_ptr = 0;
|
||||
bcc_ptr++;
|
||||
}
|
||||
unicode_oslm_strings(&bcc_ptr, nls_cp);
|
||||
} else {
|
||||
cifs_dbg(VFS, "secType %d not supported!\n", type);
|
||||
rc = -ENOSYS;
|
||||
goto ssetup_exit;
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
iov[2].iov_base = str_area;
|
||||
iov[2].iov_len = (long) bcc_ptr - (long) str_area;
|
||||
return 0;
|
||||
}
|
||||
|
||||
count = iov[1].iov_len + iov[2].iov_len;
|
||||
smb_buf->smb_buf_length =
|
||||
cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
|
||||
int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
|
||||
const struct nls_table *nls_cp)
|
||||
{
|
||||
int rc = 0;
|
||||
struct sess_data *sess_data;
|
||||
|
||||
put_bcc(count, smb_buf);
|
||||
|
||||
rc = SendReceive2(xid, ses, iov, 3 /* num_iovecs */, &resp_buf_type,
|
||||
CIFS_LOG_ERROR);
|
||||
/* SMB request buf freed in SendReceive2 */
|
||||
|
||||
pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base;
|
||||
smb_buf = (struct smb_hdr *)iov[0].iov_base;
|
||||
|
||||
if ((type == RawNTLMSSP) && (resp_buf_type != CIFS_NO_BUFFER) &&
|
||||
(smb_buf->Status.CifsError ==
|
||||
cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))) {
|
||||
if (phase != NtLmNegotiate) {
|
||||
cifs_dbg(VFS, "Unexpected more processing error\n");
|
||||
goto ssetup_exit;
|
||||
}
|
||||
/* NTLMSSP Negotiate sent now processing challenge (response) */
|
||||
phase = NtLmChallenge; /* process ntlmssp challenge */
|
||||
rc = 0; /* MORE_PROC rc is not an error here, but expected */
|
||||
if (ses == NULL) {
|
||||
WARN(1, "%s: ses == NULL!", __func__);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
|
||||
if (!sess_data)
|
||||
return -ENOMEM;
|
||||
|
||||
rc = select_sec(ses, sess_data);
|
||||
if (rc)
|
||||
goto ssetup_exit;
|
||||
goto out;
|
||||
|
||||
if (smb_buf->WordCount != 4) {
|
||||
rc = -EIO;
|
||||
cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
|
||||
goto ssetup_exit;
|
||||
}
|
||||
action = le16_to_cpu(pSMB->resp.Action);
|
||||
if (action & GUEST_LOGIN)
|
||||
cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
|
||||
ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
|
||||
cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
|
||||
/* response can have either 3 or 4 word count - Samba sends 3 */
|
||||
/* and lanman response is 3 */
|
||||
bytes_remaining = get_bcc(smb_buf);
|
||||
bcc_ptr = pByteArea(smb_buf);
|
||||
sess_data->xid = xid;
|
||||
sess_data->ses = ses;
|
||||
sess_data->buf0_type = CIFS_NO_BUFFER;
|
||||
sess_data->nls_cp = (struct nls_table *) nls_cp;
|
||||
|
||||
blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
|
||||
if (blob_len > bytes_remaining) {
|
||||
cifs_dbg(VFS, "bad security blob length %d\n",
|
||||
blob_len);
|
||||
rc = -EINVAL;
|
||||
goto ssetup_exit;
|
||||
}
|
||||
if (phase == NtLmChallenge) {
|
||||
rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
|
||||
if (rc)
|
||||
goto ssetup_exit;
|
||||
}
|
||||
bcc_ptr += blob_len;
|
||||
bytes_remaining -= blob_len;
|
||||
while (sess_data->func)
|
||||
sess_data->func(sess_data);
|
||||
|
||||
/* BB check if Unicode and decode strings */
|
||||
if (bytes_remaining == 0) {
|
||||
/* no string area to decode, do nothing */
|
||||
} else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
|
||||
/* unicode string area must be word-aligned */
|
||||
if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
|
||||
++bcc_ptr;
|
||||
--bytes_remaining;
|
||||
}
|
||||
decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, nls_cp);
|
||||
} else {
|
||||
decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, nls_cp);
|
||||
}
|
||||
|
||||
ssetup_exit:
|
||||
kfree(str_area);
|
||||
kfree(ntlmsspblob);
|
||||
ntlmsspblob = NULL;
|
||||
if (resp_buf_type == CIFS_SMALL_BUFFER) {
|
||||
cifs_dbg(FYI, "ssetup freeing small buf %p\n", iov[0].iov_base);
|
||||
cifs_small_buf_release(iov[0].iov_base);
|
||||
} else if (resp_buf_type == CIFS_LARGE_BUFFER)
|
||||
cifs_buf_release(iov[0].iov_base);
|
||||
|
||||
/* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
|
||||
if ((phase == NtLmChallenge) && (rc == 0))
|
||||
goto ssetup_ntlmssp_authenticate;
|
||||
|
||||
if (!rc) {
|
||||
mutex_lock(&ses->server->srv_mutex);
|
||||
if (!ses->server->session_estab) {
|
||||
if (ses->server->sign) {
|
||||
ses->server->session_key.response =
|
||||
kmemdup(ses->auth_key.response,
|
||||
ses->auth_key.len, GFP_KERNEL);
|
||||
if (!ses->server->session_key.response) {
|
||||
rc = -ENOMEM;
|
||||
mutex_unlock(&ses->server->srv_mutex);
|
||||
goto keycp_exit;
|
||||
}
|
||||
ses->server->session_key.len =
|
||||
ses->auth_key.len;
|
||||
}
|
||||
ses->server->sequence_number = 0x2;
|
||||
ses->server->session_estab = true;
|
||||
}
|
||||
mutex_unlock(&ses->server->srv_mutex);
|
||||
|
||||
cifs_dbg(FYI, "CIFS session established successfully\n");
|
||||
spin_lock(&GlobalMid_Lock);
|
||||
ses->status = CifsGood;
|
||||
ses->need_reconnect = false;
|
||||
spin_unlock(&GlobalMid_Lock);
|
||||
}
|
||||
|
||||
keycp_exit:
|
||||
kfree(ses->auth_key.response);
|
||||
ses->auth_key.response = NULL;
|
||||
kfree(ses->ntlmssp);
|
||||
|
||||
return rc;
|
||||
/* Store result before we free sess_data */
|
||||
rc = sess_data->result;
|
||||
|
||||
out:
|
||||
rc = sess_data->result;
|
||||
kfree(sess_data);
|
||||
return rc;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue