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cifs: Split ntlm and ntlmv2 authentication methods off CIFS_SessSetup()
Signed-off-by: Sachin Prabhu <sprabhu@redhat.com> Reviewed-by: Shirish Pargaonkar <spargaonkar@suse.com> Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Sachin Prabhu
Steve French
parent
80a0e63751
commit
583cf7afc7
318
fs/cifs/sess.c
318
fs/cifs/sess.c
@ -754,6 +754,216 @@ sess_auth_lanman(struct sess_data *sess_data)
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}
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#endif
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static void
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sess_auth_ntlm(struct sess_data *sess_data)
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{
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int rc = 0;
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struct smb_hdr *smb_buf;
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SESSION_SETUP_ANDX *pSMB;
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char *bcc_ptr;
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struct cifs_ses *ses = sess_data->ses;
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__u32 capabilities;
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__u16 bytes_remaining;
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/* old style NTLM sessionsetup */
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/* wct = 13 */
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rc = sess_alloc_buffer(sess_data, 13);
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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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bcc_ptr = sess_data->iov[2].iov_base;
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capabilities = cifs_ssetup_hdr(ses, pSMB);
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pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
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pSMB->req_no_secext.CaseInsensitivePasswordLength =
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cpu_to_le16(CIFS_AUTH_RESP_SIZE);
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pSMB->req_no_secext.CaseSensitivePasswordLength =
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cpu_to_le16(CIFS_AUTH_RESP_SIZE);
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/* calculate ntlm response and session key */
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rc = setup_ntlm_response(ses, sess_data->nls_cp);
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if (rc) {
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cifs_dbg(VFS, "Error %d during NTLM authentication\n",
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rc);
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goto out;
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}
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/* copy ntlm response */
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memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
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CIFS_AUTH_RESP_SIZE);
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bcc_ptr += CIFS_AUTH_RESP_SIZE;
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memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
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CIFS_AUTH_RESP_SIZE);
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bcc_ptr += CIFS_AUTH_RESP_SIZE;
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if (ses->capabilities & CAP_UNICODE) {
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/* unicode strings must be word aligned */
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if (sess_data->iov[0].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_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
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} else {
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ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
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}
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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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rc = sess_sendreceive(sess_data);
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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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smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
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if (smb_buf->WordCount != 3) {
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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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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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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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/* 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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rc = sess_establish_session(sess_data);
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out:
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sess_data->result = rc;
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sess_data->func = NULL;
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sess_free_buffer(sess_data);
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kfree(ses->auth_key.response);
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ses->auth_key.response = NULL;
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}
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static void
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sess_auth_ntlmv2(struct sess_data *sess_data)
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{
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int rc = 0;
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struct smb_hdr *smb_buf;
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SESSION_SETUP_ANDX *pSMB;
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char *bcc_ptr;
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struct cifs_ses *ses = sess_data->ses;
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__u32 capabilities;
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__u16 bytes_remaining;
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/* old style NTLM sessionsetup */
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/* wct = 13 */
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rc = sess_alloc_buffer(sess_data, 13);
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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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bcc_ptr = sess_data->iov[2].iov_base;
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capabilities = cifs_ssetup_hdr(ses, pSMB);
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pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
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/* LM2 password would be here if we supported it */
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pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
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/* calculate nlmv2 response and session key */
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rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
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if (rc) {
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cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
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goto out;
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}
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memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
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ses->auth_key.len - CIFS_SESS_KEY_SIZE);
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bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
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/* set case sensitive password length after tilen may get
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* assigned, tilen is 0 otherwise.
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*/
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pSMB->req_no_secext.CaseSensitivePasswordLength =
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cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
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if (ses->capabilities & CAP_UNICODE) {
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if (sess_data->iov[0].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_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
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} else {
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ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
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}
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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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rc = sess_sendreceive(sess_data);
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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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smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
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if (smb_buf->WordCount != 3) {
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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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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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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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/* 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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rc = sess_establish_session(sess_data);
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out:
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sess_data->result = rc;
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sess_data->func = NULL;
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sess_free_buffer(sess_data);
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kfree(ses->auth_key.response);
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ses->auth_key.response = NULL;
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}
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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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@ -801,6 +1011,12 @@ CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
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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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case NTLM:
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sess_auth_ntlm(sess_data);
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goto out;
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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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default:
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cifs_dbg(FYI, "Continuing with CIFS_SessSetup\n");
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}
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@ -820,11 +1036,8 @@ 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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if ((type == NTLM) || (type == NTLMv2)) {
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/* For NTLMv2 failures eventually may need to retry NTLM */
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wct = 13; /* old style NTLM sessionsetup */
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} else /* same size: negotiate or auth, NTLMSSP or extended security */
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wct = 12;
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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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@ -859,70 +1072,7 @@ ssetup_ntlmssp_authenticate:
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iov[1].iov_base = NULL;
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iov[1].iov_len = 0;
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if (type == NTLM) {
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pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
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pSMB->req_no_secext.CaseInsensitivePasswordLength =
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cpu_to_le16(CIFS_AUTH_RESP_SIZE);
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pSMB->req_no_secext.CaseSensitivePasswordLength =
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cpu_to_le16(CIFS_AUTH_RESP_SIZE);
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/* calculate ntlm response and session key */
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rc = setup_ntlm_response(ses, nls_cp);
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if (rc) {
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cifs_dbg(VFS, "Error %d during NTLM authentication\n",
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rc);
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goto ssetup_exit;
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}
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/* copy ntlm response */
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memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
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CIFS_AUTH_RESP_SIZE);
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bcc_ptr += CIFS_AUTH_RESP_SIZE;
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memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
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CIFS_AUTH_RESP_SIZE);
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bcc_ptr += CIFS_AUTH_RESP_SIZE;
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if (ses->capabilities & CAP_UNICODE) {
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/* unicode strings must be word aligned */
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if (iov[0].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_ssetup_strings(&bcc_ptr, ses, nls_cp);
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} else
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ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
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} else if (type == NTLMv2) {
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pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
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/* LM2 password would be here if we supported it */
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pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
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/* calculate nlmv2 response and session key */
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rc = setup_ntlmv2_rsp(ses, nls_cp);
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if (rc) {
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cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n",
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rc);
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goto ssetup_exit;
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}
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memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
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ses->auth_key.len - CIFS_SESS_KEY_SIZE);
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bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
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/* set case sensitive password length after tilen may get
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* assigned, tilen is 0 otherwise.
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*/
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pSMB->req_no_secext.CaseSensitivePasswordLength =
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cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
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if (ses->capabilities & CAP_UNICODE) {
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if (iov[0].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_ssetup_strings(&bcc_ptr, ses, nls_cp);
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} else
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ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
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} else if (type == Kerberos) {
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if (type == Kerberos) {
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#ifdef CONFIG_CIFS_UPCALL
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struct cifs_spnego_msg *msg;
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@ -1073,7 +1223,7 @@ ssetup_ntlmssp_authenticate:
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if (rc)
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goto ssetup_exit;
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if ((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) {
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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 ssetup_exit;
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@ -1088,22 +1238,20 @@ ssetup_ntlmssp_authenticate:
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bytes_remaining = get_bcc(smb_buf);
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bcc_ptr = pByteArea(smb_buf);
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if (smb_buf->WordCount == 4) {
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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 ssetup_exit;
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}
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if (phase == NtLmChallenge) {
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rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
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if (rc)
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goto ssetup_exit;
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}
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bcc_ptr += blob_len;
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bytes_remaining -= blob_len;
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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 ssetup_exit;
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}
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if (phase == NtLmChallenge) {
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rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
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if (rc)
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goto ssetup_exit;
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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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