diff options
Diffstat (limited to 'fs/cifs/smb2pdu.c')
-rw-r--r-- | fs/cifs/smb2pdu.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 719e4c4f0307..2165f0d15963 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -328,3 +328,224 @@ neg_exit: free_rsp_buf(resp_buftype, rsp); return rc; } + +int +SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses, + const struct nls_table *nls_cp) +{ + struct smb2_sess_setup_req *req; + struct smb2_sess_setup_rsp *rsp = NULL; + struct kvec iov[2]; + int rc = 0; + int resp_buftype; + __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */ + struct TCP_Server_Info *server; + unsigned int sec_flags; + u8 temp = 0; + u16 blob_length = 0; + char *security_blob; + char *ntlmssp_blob = NULL; + bool use_spnego = false; /* else use raw ntlmssp */ + + cFYI(1, "Session Setup"); + + if (ses->server) + server = ses->server; + else { + rc = -EIO; + return rc; + } + + /* + * If memory allocation is successful, caller of this function + * frees it. + */ + ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL); + if (!ses->ntlmssp) + return -ENOMEM; + + ses->server->secType = RawNTLMSSP; + +ssetup_ntlmssp_authenticate: + if (phase == NtLmChallenge) + phase = NtLmAuthenticate; /* if ntlmssp, now final phase */ + + rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req); + if (rc) + return rc; + + /* if any of auth flags (ie not sign or seal) are overriden use them */ + if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL))) + sec_flags = ses->overrideSecFlg; /* BB FIXME fix sign flags?*/ + else /* if override flags set only sign/seal OR them with global auth */ + sec_flags = global_secflags | ses->overrideSecFlg; + + cFYI(1, "sec_flags 0x%x", sec_flags); + + req->hdr.SessionId = 0; /* First session, not a reauthenticate */ + req->VcNumber = 0; /* MBZ */ + /* to enable echos and oplocks */ + req->hdr.CreditRequest = cpu_to_le16(3); + + /* only one of SMB2 signing flags may be set in SMB2 request */ + if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) + temp = SMB2_NEGOTIATE_SIGNING_REQUIRED; + else if (ses->server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) + temp = SMB2_NEGOTIATE_SIGNING_REQUIRED; + else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */ + temp = SMB2_NEGOTIATE_SIGNING_ENABLED; + + req->SecurityMode = temp; + req->Capabilities = 0; + req->Channel = 0; /* MBZ */ + + iov[0].iov_base = (char *)req; + /* 4 for rfc1002 length field and 1 for pad */ + iov[0].iov_len = get_rfc1002_length(req) + 4 - 1; + if (phase == NtLmNegotiate) { + ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE), + GFP_KERNEL); + if (ntlmssp_blob == NULL) { + rc = -ENOMEM; + goto ssetup_exit; + } + build_ntlmssp_negotiate_blob(ntlmssp_blob, ses); + if (use_spnego) { + /* blob_length = build_spnego_ntlmssp_blob( + &security_blob, + sizeof(struct _NEGOTIATE_MESSAGE), + ntlmssp_blob); */ + /* BB eventually need to add this */ + cERROR(1, "spnego not supported for SMB2 yet"); + rc = -EOPNOTSUPP; + kfree(ntlmssp_blob); + goto ssetup_exit; + } else { + blob_length = sizeof(struct _NEGOTIATE_MESSAGE); + /* with raw NTLMSSP we don't encapsulate in SPNEGO */ + security_blob = ntlmssp_blob; + } + } else if (phase == NtLmAuthenticate) { + req->hdr.SessionId = ses->Suid; + ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500, + GFP_KERNEL); + if (ntlmssp_blob == NULL) { + cERROR(1, "failed to malloc ntlmssp blob"); + rc = -ENOMEM; + goto ssetup_exit; + } + rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses, + nls_cp); + if (rc) { + cFYI(1, "build_ntlmssp_auth_blob failed %d", rc); + goto ssetup_exit; /* BB double check error handling */ + } + if (use_spnego) { + /* blob_length = build_spnego_ntlmssp_blob( + &security_blob, + blob_length, + ntlmssp_blob); */ + cERROR(1, "spnego not supported for SMB2 yet"); + rc = -EOPNOTSUPP; + kfree(ntlmssp_blob); + goto ssetup_exit; + } else { + security_blob = ntlmssp_blob; + } + } else { + cERROR(1, "illegal ntlmssp phase"); + rc = -EIO; + goto ssetup_exit; + } + + /* Testing shows that buffer offset must be at location of Buffer[0] */ + req->SecurityBufferOffset = + cpu_to_le16(sizeof(struct smb2_sess_setup_req) - + 1 /* pad */ - 4 /* rfc1001 len */); + req->SecurityBufferLength = cpu_to_le16(blob_length); + iov[1].iov_base = security_blob; + iov[1].iov_len = blob_length; + + inc_rfc1001_len(req, blob_length - 1 /* pad */); + + /* BB add code to build os and lm fields */ + + rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, CIFS_LOG_ERROR); + + kfree(security_blob); + rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base; + if (rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) { + if (phase != NtLmNegotiate) { + cERROR(1, "Unexpected more processing error"); + goto ssetup_exit; + } + if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 != + le16_to_cpu(rsp->SecurityBufferOffset)) { + cERROR(1, "Invalid security buffer offset %d", + le16_to_cpu(rsp->SecurityBufferOffset)); + rc = -EIO; + goto ssetup_exit; + } + + /* NTLMSSP Negotiate sent now processing challenge (response) */ + phase = NtLmChallenge; /* process ntlmssp challenge */ + rc = 0; /* MORE_PROCESSING is not an error here but expected */ + ses->Suid = rsp->hdr.SessionId; + rc = decode_ntlmssp_challenge(rsp->Buffer, + le16_to_cpu(rsp->SecurityBufferLength), ses); + } + + /* + * BB eventually add code for SPNEGO decoding of NtlmChallenge blob, + * but at least the raw NTLMSSP case works. + */ + /* + * No tcon so can't do + * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]); + */ + if (rc != 0) + goto ssetup_exit; + + if (rsp == NULL) { + rc = -EIO; + goto ssetup_exit; + } + + ses->session_flags = le16_to_cpu(rsp->SessionFlags); +ssetup_exit: + free_rsp_buf(resp_buftype, rsp); + + /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */ + if ((phase == NtLmChallenge) && (rc == 0)) + goto ssetup_ntlmssp_authenticate; + return rc; +} + +int +SMB2_logoff(const unsigned int xid, struct cifs_ses *ses) +{ + struct smb2_logoff_req *req; /* response is also trivial struct */ + int rc = 0; + struct TCP_Server_Info *server; + + cFYI(1, "disconnect session %p", ses); + + if (ses && (ses->server)) + server = ses->server; + else + return -EIO; + + rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req); + if (rc) + return rc; + + /* since no tcon, smb2_init can not do this, so do here */ + req->hdr.SessionId = ses->Suid; + + rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0); + /* + * No tcon so can't do + * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]); + */ + return rc; +} |