From 583cf7afc743af9624e85aab472e8bdcd0ba8b3f Mon Sep 17 00:00:00 2001 From: Sachin Prabhu Date: Mon, 16 Jun 2014 15:35:26 +0100 Subject: [PATCH] cifs: Split ntlm and ntlmv2 authentication methods off CIFS_SessSetup() Signed-off-by: Sachin Prabhu Reviewed-by: Shirish Pargaonkar Signed-off-by: Steve French --- fs/cifs/sess.c | 318 ++++++++++++++++++++++++++++++++++++------------- 1 file changed, 233 insertions(+), 85 deletions(-) diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c index 36d0b908f8b4..4f481c133f6e 100644 --- a/fs/cifs/sess.c +++ b/fs/cifs/sess.c @@ -754,6 +754,216 @@ sess_auth_lanman(struct sess_data *sess_data) } #endif +static void +sess_auth_ntlm(struct sess_data *sess_data) +{ + int rc = 0; + struct smb_hdr *smb_buf; + SESSION_SETUP_ANDX *pSMB; + char *bcc_ptr; + struct cifs_ses *ses = sess_data->ses; + __u32 capabilities; + __u16 bytes_remaining; + + /* old style NTLM sessionsetup */ + /* wct = 13 */ + rc = sess_alloc_buffer(sess_data, 13); + if (rc) + goto out; + + pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; + bcc_ptr = sess_data->iov[2].iov_base; + capabilities = cifs_ssetup_hdr(ses, pSMB); + + pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); + pSMB->req_no_secext.CaseInsensitivePasswordLength = + cpu_to_le16(CIFS_AUTH_RESP_SIZE); + pSMB->req_no_secext.CaseSensitivePasswordLength = + cpu_to_le16(CIFS_AUTH_RESP_SIZE); + + /* calculate ntlm response and session key */ + rc = setup_ntlm_response(ses, sess_data->nls_cp); + if (rc) { + cifs_dbg(VFS, "Error %d during NTLM authentication\n", + rc); + goto out; + } + + /* copy ntlm response */ + memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, + CIFS_AUTH_RESP_SIZE); + bcc_ptr += CIFS_AUTH_RESP_SIZE; + memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, + CIFS_AUTH_RESP_SIZE); + bcc_ptr += CIFS_AUTH_RESP_SIZE; + + if (ses->capabilities & CAP_UNICODE) { + /* unicode strings must be word aligned */ + if (sess_data->iov[0].iov_len % 2) { + *bcc_ptr = 0; + bcc_ptr++; + } + unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); + } else { + ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); + } + + + sess_data->iov[2].iov_len = (long) bcc_ptr - + (long) sess_data->iov[2].iov_base; + + rc = sess_sendreceive(sess_data); + if (rc) + goto out; + + pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; + smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; + + if (smb_buf->WordCount != 3) { + rc = -EIO; + cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); + goto out; + } + + if (le16_to_cpu(pSMB->resp.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); + + bytes_remaining = get_bcc(smb_buf); + bcc_ptr = pByteArea(smb_buf); + + /* 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, + sess_data->nls_cp); + } else { + decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, + sess_data->nls_cp); + } + + rc = sess_establish_session(sess_data); +out: + sess_data->result = rc; + sess_data->func = NULL; + sess_free_buffer(sess_data); + kfree(ses->auth_key.response); + ses->auth_key.response = NULL; +} + +static void +sess_auth_ntlmv2(struct sess_data *sess_data) +{ + int rc = 0; + struct smb_hdr *smb_buf; + SESSION_SETUP_ANDX *pSMB; + char *bcc_ptr; + struct cifs_ses *ses = sess_data->ses; + __u32 capabilities; + __u16 bytes_remaining; + + /* old style NTLM sessionsetup */ + /* wct = 13 */ + rc = sess_alloc_buffer(sess_data, 13); + if (rc) + goto out; + + pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; + bcc_ptr = sess_data->iov[2].iov_base; + capabilities = cifs_ssetup_hdr(ses, pSMB); + + pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); + + /* LM2 password would be here if we supported it */ + pSMB->req_no_secext.CaseInsensitivePasswordLength = 0; + + /* calculate nlmv2 response and session key */ + rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp); + if (rc) { + cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc); + goto out; + } + + memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, + ses->auth_key.len - CIFS_SESS_KEY_SIZE); + bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE; + + /* set case sensitive password length after tilen may get + * assigned, tilen is 0 otherwise. + */ + pSMB->req_no_secext.CaseSensitivePasswordLength = + cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); + + if (ses->capabilities & CAP_UNICODE) { + if (sess_data->iov[0].iov_len % 2) { + *bcc_ptr = 0; + bcc_ptr++; + } + unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); + } else { + ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); + } + + + sess_data->iov[2].iov_len = (long) bcc_ptr - + (long) sess_data->iov[2].iov_base; + + rc = sess_sendreceive(sess_data); + if (rc) + goto out; + + pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; + smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; + + if (smb_buf->WordCount != 3) { + rc = -EIO; + cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); + goto out; + } + + if (le16_to_cpu(pSMB->resp.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); + + bytes_remaining = get_bcc(smb_buf); + bcc_ptr = pByteArea(smb_buf); + + /* 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, + sess_data->nls_cp); + } else { + decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, + sess_data->nls_cp); + } + + rc = sess_establish_session(sess_data); +out: + sess_data->result = rc; + sess_data->func = NULL; + sess_free_buffer(sess_data); + kfree(ses->auth_key.response); + ses->auth_key.response = NULL; +} + + int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses, const struct nls_table *nls_cp) @@ -801,6 +1011,12 @@ CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses, case LANMAN: sess_auth_lanman(sess_data); goto out; + case NTLM: + sess_auth_ntlm(sess_data); + goto out; + case NTLMv2: + sess_auth_ntlmv2(sess_data); + goto out; default: cifs_dbg(FYI, "Continuing with CIFS_SessSetup\n"); } @@ -820,11 +1036,8 @@ ssetup_ntlmssp_authenticate: if (phase == NtLmChallenge) phase = NtLmAuthenticate; /* if ntlmssp, now final phase */ - if ((type == NTLM) || (type == NTLMv2)) { - /* For NTLMv2 failures eventually may need to retry NTLM */ - wct = 13; /* old style NTLM sessionsetup */ - } else /* same size: negotiate or auth, NTLMSSP or extended security */ - wct = 12; + /* same size: negotiate or auth, NTLMSSP or extended security */ + wct = 12; rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses, (void **)&smb_buf); @@ -859,70 +1072,7 @@ ssetup_ntlmssp_authenticate: iov[1].iov_base = NULL; iov[1].iov_len = 0; - if (type == NTLM) { - pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); - pSMB->req_no_secext.CaseInsensitivePasswordLength = - cpu_to_le16(CIFS_AUTH_RESP_SIZE); - pSMB->req_no_secext.CaseSensitivePasswordLength = - cpu_to_le16(CIFS_AUTH_RESP_SIZE); - - /* calculate ntlm response and session key */ - rc = setup_ntlm_response(ses, nls_cp); - if (rc) { - cifs_dbg(VFS, "Error %d during NTLM authentication\n", - rc); - goto ssetup_exit; - } - - /* copy ntlm response */ - memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, - CIFS_AUTH_RESP_SIZE); - bcc_ptr += CIFS_AUTH_RESP_SIZE; - memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, - CIFS_AUTH_RESP_SIZE); - bcc_ptr += CIFS_AUTH_RESP_SIZE; - - if (ses->capabilities & CAP_UNICODE) { - /* unicode strings must be word aligned */ - if (iov[0].iov_len % 2) { - *bcc_ptr = 0; - bcc_ptr++; - } - unicode_ssetup_strings(&bcc_ptr, ses, nls_cp); - } else - ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); - } else if (type == NTLMv2) { - pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); - - /* LM2 password would be here if we supported it */ - pSMB->req_no_secext.CaseInsensitivePasswordLength = 0; - - /* calculate nlmv2 response and session key */ - rc = setup_ntlmv2_rsp(ses, nls_cp); - if (rc) { - cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", - rc); - goto ssetup_exit; - } - memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, - ses->auth_key.len - CIFS_SESS_KEY_SIZE); - bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE; - - /* set case sensitive password length after tilen may get - * assigned, tilen is 0 otherwise. - */ - pSMB->req_no_secext.CaseSensitivePasswordLength = - cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); - - if (ses->capabilities & CAP_UNICODE) { - if (iov[0].iov_len % 2) { - *bcc_ptr = 0; - bcc_ptr++; - } - unicode_ssetup_strings(&bcc_ptr, ses, nls_cp); - } else - ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); - } else if (type == Kerberos) { + if (type == Kerberos) { #ifdef CONFIG_CIFS_UPCALL struct cifs_spnego_msg *msg; @@ -1073,7 +1223,7 @@ ssetup_ntlmssp_authenticate: if (rc) goto ssetup_exit; - if ((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) { + if (smb_buf->WordCount != 4) { rc = -EIO; cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); goto ssetup_exit; @@ -1088,22 +1238,20 @@ ssetup_ntlmssp_authenticate: bytes_remaining = get_bcc(smb_buf); bcc_ptr = pByteArea(smb_buf); - if (smb_buf->WordCount == 4) { - 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; + 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; /* BB check if Unicode and decode strings */ if (bytes_remaining == 0) {