| /* |
| * fs/cifs/smb2pdu.c |
| * |
| * Copyright (C) International Business Machines Corp., 2009, 2011 |
| * Etersoft, 2012 |
| * Author(s): Steve French (sfrench@us.ibm.com) |
| * Pavel Shilovsky (pshilovsky@samba.org) 2012 |
| * |
| * Contains the routines for constructing the SMB2 PDUs themselves |
| * |
| * This library is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Lesser General Public License as published |
| * by the Free Software Foundation; either version 2.1 of the License, or |
| * (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| * the GNU Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public License |
| * along with this library; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */ |
| /* Note that there are handle based routines which must be */ |
| /* treated slightly differently for reconnection purposes since we never */ |
| /* want to reuse a stale file handle and only the caller knows the file info */ |
| |
| #include <linux/fs.h> |
| #include <linux/kernel.h> |
| #include <linux/vfs.h> |
| #include <linux/uaccess.h> |
| #include <linux/xattr.h> |
| #include "smb2pdu.h" |
| #include "cifsglob.h" |
| #include "cifsacl.h" |
| #include "cifsproto.h" |
| #include "smb2proto.h" |
| #include "cifs_unicode.h" |
| #include "cifs_debug.h" |
| #include "ntlmssp.h" |
| #include "smb2status.h" |
| |
| /* |
| * The following table defines the expected "StructureSize" of SMB2 requests |
| * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests. |
| * |
| * Note that commands are defined in smb2pdu.h in le16 but the array below is |
| * indexed by command in host byte order. |
| */ |
| static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = { |
| /* SMB2_NEGOTIATE */ 36, |
| /* SMB2_SESSION_SETUP */ 25, |
| /* SMB2_LOGOFF */ 4, |
| /* SMB2_TREE_CONNECT */ 9, |
| /* SMB2_TREE_DISCONNECT */ 4, |
| /* SMB2_CREATE */ 57, |
| /* SMB2_CLOSE */ 24, |
| /* SMB2_FLUSH */ 24, |
| /* SMB2_READ */ 49, |
| /* SMB2_WRITE */ 49, |
| /* SMB2_LOCK */ 48, |
| /* SMB2_IOCTL */ 57, |
| /* SMB2_CANCEL */ 4, |
| /* SMB2_ECHO */ 4, |
| /* SMB2_QUERY_DIRECTORY */ 33, |
| /* SMB2_CHANGE_NOTIFY */ 32, |
| /* SMB2_QUERY_INFO */ 41, |
| /* SMB2_SET_INFO */ 33, |
| /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */ |
| }; |
| |
| |
| static void |
| smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ , |
| const struct cifs_tcon *tcon) |
| { |
| struct smb2_pdu *pdu = (struct smb2_pdu *)hdr; |
| char *temp = (char *)hdr; |
| /* lookup word count ie StructureSize from table */ |
| __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)]; |
| |
| /* |
| * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of |
| * largest operations (Create) |
| */ |
| memset(temp, 0, 256); |
| |
| /* Note this is only network field converted to big endian */ |
| hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr) |
| - 4 /* RFC 1001 length field itself not counted */); |
| |
| hdr->ProtocolId[0] = 0xFE; |
| hdr->ProtocolId[1] = 'S'; |
| hdr->ProtocolId[2] = 'M'; |
| hdr->ProtocolId[3] = 'B'; |
| hdr->StructureSize = cpu_to_le16(64); |
| hdr->Command = smb2_cmd; |
| hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */ |
| hdr->ProcessId = cpu_to_le32((__u16)current->tgid); |
| |
| if (!tcon) |
| goto out; |
| |
| hdr->TreeId = tcon->tid; |
| /* Uid is not converted */ |
| if (tcon->ses) |
| hdr->SessionId = tcon->ses->Suid; |
| /* BB check following DFS flags BB */ |
| /* BB do we have to add check for SHI1005_FLAGS_DFS_ROOT too? */ |
| /* if (tcon->share_flags & SHI1005_FLAGS_DFS) |
| hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */ |
| /* BB how does SMB2 do case sensitive? */ |
| /* if (tcon->nocase) |
| hdr->Flags |= SMBFLG_CASELESS; */ |
| /* if (tcon->ses && tcon->ses->server && |
| (tcon->ses->server->sec_mode & SECMODE_SIGN_REQUIRED)) |
| hdr->Flags |= SMB2_FLAGS_SIGNED; */ |
| out: |
| pdu->StructureSize2 = cpu_to_le16(parmsize); |
| return; |
| } |
| |
| static int |
| smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon) |
| { |
| int rc = 0; |
| /* BB add missing code here */ |
| return rc; |
| } |
| |
| /* |
| * Allocate and return pointer to an SMB request hdr, and set basic |
| * SMB information in the SMB header. If the return code is zero, this |
| * function must have filled in request_buf pointer. |
| */ |
| static int |
| small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon, |
| void **request_buf) |
| { |
| int rc = 0; |
| |
| rc = smb2_reconnect(smb2_command, tcon); |
| if (rc) |
| return rc; |
| |
| /* BB eventually switch this to SMB2 specific small buf size */ |
| *request_buf = cifs_small_buf_get(); |
| if (*request_buf == NULL) { |
| /* BB should we add a retry in here if not a writepage? */ |
| return -ENOMEM; |
| } |
| |
| smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon); |
| |
| if (tcon != NULL) { |
| #ifdef CONFIG_CIFS_STATS2 |
| /* |
| uint16_t com_code = le16_to_cpu(smb2_command); |
| cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]); |
| */ |
| #endif |
| cifs_stats_inc(&tcon->num_smbs_sent); |
| } |
| |
| return rc; |
| } |
| |
| static void |
| free_rsp_buf(int resp_buftype, void *rsp) |
| { |
| if (resp_buftype == CIFS_SMALL_BUFFER) |
| cifs_small_buf_release(rsp); |
| else if (resp_buftype == CIFS_LARGE_BUFFER) |
| cifs_buf_release(rsp); |
| } |
| |
| #define SMB2_NUM_PROT 1 |
| |
| #define SMB2_PROT 0 |
| #define SMB21_PROT 1 |
| #define BAD_PROT 0xFFFF |
| |
| #define SMB2_PROT_ID 0x0202 |
| #define SMB21_PROT_ID 0x0210 |
| #define BAD_PROT_ID 0xFFFF |
| |
| static struct { |
| int index; |
| __le16 name; |
| } smb2protocols[] = { |
| {SMB2_PROT, cpu_to_le16(SMB2_PROT_ID)}, |
| {SMB21_PROT, cpu_to_le16(SMB21_PROT_ID)}, |
| {BAD_PROT, cpu_to_le16(BAD_PROT_ID)} |
| }; |
| |
| /* |
| * |
| * SMB2 Worker functions follow: |
| * |
| * The general structure of the worker functions is: |
| * 1) Call smb2_init (assembles SMB2 header) |
| * 2) Initialize SMB2 command specific fields in fixed length area of SMB |
| * 3) Call smb_sendrcv2 (sends request on socket and waits for response) |
| * 4) Decode SMB2 command specific fields in the fixed length area |
| * 5) Decode variable length data area (if any for this SMB2 command type) |
| * 6) Call free smb buffer |
| * 7) return |
| * |
| */ |
| |
| int |
| SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses) |
| { |
| struct smb2_negotiate_req *req; |
| struct smb2_negotiate_rsp *rsp; |
| struct kvec iov[1]; |
| int rc = 0; |
| int resp_buftype; |
| struct TCP_Server_Info *server; |
| unsigned int sec_flags; |
| u16 i; |
| u16 temp = 0; |
| int blob_offset, blob_length; |
| char *security_blob; |
| int flags = CIFS_NEG_OP; |
| |
| cFYI(1, "Negotiate protocol"); |
| |
| if (ses->server) |
| server = ses->server; |
| else { |
| rc = -EIO; |
| return rc; |
| } |
| |
| rc = small_smb2_init(SMB2_NEGOTIATE, 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; |
| |
| for (i = 0; i < SMB2_NUM_PROT; i++) |
| req->Dialects[i] = smb2protocols[i].name; |
| |
| req->DialectCount = cpu_to_le16(i); |
| inc_rfc1001_len(req, i * 2); |
| |
| /* 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 (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */ |
| temp = SMB2_NEGOTIATE_SIGNING_ENABLED; |
| |
| req->SecurityMode = cpu_to_le16(temp); |
| |
| req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS); |
| |
| iov[0].iov_base = (char *)req; |
| /* 4 for rfc1002 length field */ |
| iov[0].iov_len = get_rfc1002_length(req) + 4; |
| |
| rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags); |
| |
| rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base; |
| /* |
| * No tcon so can't do |
| * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]); |
| */ |
| if (rc != 0) |
| goto neg_exit; |
| |
| if (rsp == NULL) { |
| rc = -EIO; |
| goto neg_exit; |
| } |
| |
| cFYI(1, "mode 0x%x", rsp->SecurityMode); |
| |
| if (rsp->DialectRevision == smb2protocols[SMB21_PROT].name) |
| cFYI(1, "negotiated smb2.1 dialect"); |
| else if (rsp->DialectRevision == smb2protocols[SMB2_PROT].name) |
| cFYI(1, "negotiated smb2 dialect"); |
| else { |
| cERROR(1, "Illegal dialect returned by server %d", |
| le16_to_cpu(rsp->DialectRevision)); |
| rc = -EIO; |
| goto neg_exit; |
| } |
| server->dialect = le16_to_cpu(rsp->DialectRevision); |
| |
| server->maxBuf = le32_to_cpu(rsp->MaxTransactSize); |
| server->max_read = le32_to_cpu(rsp->MaxReadSize); |
| server->max_write = le32_to_cpu(rsp->MaxWriteSize); |
| /* BB Do we need to validate the SecurityMode? */ |
| server->sec_mode = le16_to_cpu(rsp->SecurityMode); |
| server->capabilities = le32_to_cpu(rsp->Capabilities); |
| |
| security_blob = smb2_get_data_area_len(&blob_offset, &blob_length, |
| &rsp->hdr); |
| if (blob_length == 0) { |
| cERROR(1, "missing security blob on negprot"); |
| rc = -EIO; |
| goto neg_exit; |
| } |
| #ifdef CONFIG_SMB2_ASN1 /* BB REMOVEME when updated asn1.c ready */ |
| rc = decode_neg_token_init(security_blob, blob_length, |
| &server->sec_type); |
| if (rc == 1) |
| rc = 0; |
| else if (rc == 0) { |
| rc = -EIO; |
| goto neg_exit; |
| } |
| #endif |
| |
| neg_exit: |
| free_rsp_buf(resp_buftype, rsp); |
| return rc; |
| } |