| /* |
| * fs/cifs/sess.c |
| * |
| * SMB/CIFS session setup handling routines |
| * |
| * Copyright (c) International Business Machines Corp., 2006 |
| * Author(s): Steve French (sfrench@us.ibm.com) |
| * |
| * 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 |
| */ |
| |
| #include "cifspdu.h" |
| #include "cifsglob.h" |
| #include "cifsproto.h" |
| #include "cifs_unicode.h" |
| #include "cifs_debug.h" |
| #include "ntlmssp.h" |
| #include "nterr.h" |
| #include <linux/utsname.h> |
| |
| extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8, |
| unsigned char *p24); |
| |
| static __u32 cifs_ssetup_hdr(struct cifsSesInfo *ses, SESSION_SETUP_ANDX *pSMB) |
| { |
| __u32 capabilities = 0; |
| |
| /* init fields common to all four types of SessSetup */ |
| /* note that header is initialized to zero in header_assemble */ |
| pSMB->req.AndXCommand = 0xFF; |
| pSMB->req.MaxBufferSize = cpu_to_le16(ses->server->maxBuf); |
| pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq); |
| |
| /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */ |
| |
| /* BB verify whether signing required on neg or just on auth frame |
| (and NTLM case) */ |
| |
| capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS | |
| CAP_LARGE_WRITE_X | CAP_LARGE_READ_X; |
| |
| if(ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
| pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
| |
| if (ses->capabilities & CAP_UNICODE) { |
| pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE; |
| capabilities |= CAP_UNICODE; |
| } |
| if (ses->capabilities & CAP_STATUS32) { |
| pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS; |
| capabilities |= CAP_STATUS32; |
| } |
| if (ses->capabilities & CAP_DFS) { |
| pSMB->req.hdr.Flags2 |= SMBFLG2_DFS; |
| capabilities |= CAP_DFS; |
| } |
| if (ses->capabilities & CAP_UNIX) { |
| capabilities |= CAP_UNIX; |
| } |
| |
| /* BB check whether to init vcnum BB */ |
| return capabilities; |
| } |
| |
| static void unicode_ssetup_strings(char ** pbcc_area, struct cifsSesInfo *ses, |
| const struct nls_table * nls_cp) |
| { |
| char * bcc_ptr = *pbcc_area; |
| int bytes_ret = 0; |
| |
| /* BB FIXME add check that strings total less |
| than 335 or will need to send them as arrays */ |
| |
| /* unicode strings, must be word aligned before the call */ |
| /* if ((long) bcc_ptr % 2) { |
| *bcc_ptr = 0; |
| bcc_ptr++; |
| } */ |
| /* copy user */ |
| if(ses->userName == NULL) { |
| /* BB what about null user mounts - check that we do this BB */ |
| } else { /* 300 should be long enough for any conceivable user name */ |
| bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->userName, |
| 300, nls_cp); |
| } |
| bcc_ptr += 2 * bytes_ret; |
| bcc_ptr += 2; /* account for null termination */ |
| /* copy domain */ |
| if(ses->domainName == NULL) |
| bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, |
| "CIFS_LINUX_DOM", 32, nls_cp); |
| else |
| bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->domainName, |
| 256, nls_cp); |
| bcc_ptr += 2 * bytes_ret; |
| bcc_ptr += 2; /* account for null terminator */ |
| |
| /* Copy OS version */ |
| bytes_ret = cifs_strtoUCS((__le16 *)bcc_ptr, "Linux version ", 32, |
| nls_cp); |
| bcc_ptr += 2 * bytes_ret; |
| bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, system_utsname.release, |
| 32, nls_cp); |
| bcc_ptr += 2 * bytes_ret; |
| bcc_ptr += 2; /* trailing null */ |
| |
| bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS, |
| 32, nls_cp); |
| bcc_ptr += 2 * bytes_ret; |
| bcc_ptr += 2; /* trailing null */ |
| |
| *pbcc_area = bcc_ptr; |
| } |
| |
| static void ascii_ssetup_strings(char ** pbcc_area, struct cifsSesInfo *ses, |
| const struct nls_table * nls_cp) |
| { |
| char * bcc_ptr = *pbcc_area; |
| |
| /* copy user */ |
| /* BB what about null user mounts - check that we do this BB */ |
| /* copy user */ |
| if(ses->userName == NULL) { |
| /* BB what about null user mounts - check that we do this BB */ |
| } else { /* 300 should be long enough for any conceivable user name */ |
| strncpy(bcc_ptr, ses->userName, 300); |
| } |
| /* BB improve check for overflow */ |
| bcc_ptr += strnlen(ses->userName, 300); |
| *bcc_ptr = 0; |
| bcc_ptr++; /* account for null termination */ |
| |
| /* copy domain */ |
| |
| if(ses->domainName == NULL) { |
| strcpy(bcc_ptr, "CIFS_LINUX_DOM"); |
| bcc_ptr += 14; /* strlen(CIFS_LINUX_DOM) */ |
| } else { |
| strncpy(bcc_ptr, ses->domainName, 256); |
| bcc_ptr += strnlen(ses->domainName, 256); |
| } |
| *bcc_ptr = 0; |
| bcc_ptr++; |
| |
| /* BB check for overflow here */ |
| |
| strcpy(bcc_ptr, "Linux version "); |
| bcc_ptr += strlen("Linux version "); |
| strcpy(bcc_ptr, system_utsname.release); |
| bcc_ptr += strlen(system_utsname.release) + 1; |
| |
| strcpy(bcc_ptr, CIFS_NETWORK_OPSYS); |
| bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1; |
| |
| *pbcc_area = bcc_ptr; |
| } |
| |
| static int decode_unicode_ssetup(char ** pbcc_area, int bleft, struct cifsSesInfo *ses, |
| const struct nls_table * nls_cp) |
| { |
| int rc = 0; |
| int words_left, len; |
| char * data = *pbcc_area; |
| |
| |
| |
| cFYI(1,("bleft %d",bleft)); |
| |
| |
| /* word align, if bytes remaining is not even */ |
| if(bleft % 2) { |
| bleft--; |
| data++; |
| } |
| words_left = bleft / 2; |
| |
| /* save off server operating system */ |
| len = UniStrnlen((wchar_t *) data, words_left); |
| |
| /* We look for obvious messed up bcc or strings in response so we do not go off |
| the end since (at least) WIN2K and Windows XP have a major bug in not null |
| terminating last Unicode string in response */ |
| if(len >= words_left) |
| return rc; |
| |
| if(ses->serverOS) |
| kfree(ses->serverOS); |
| /* UTF-8 string will not grow more than four times as big as UCS-16 */ |
| ses->serverOS = kzalloc(4 * len, GFP_KERNEL); |
| if(ses->serverOS != NULL) { |
| cifs_strfromUCS_le(ses->serverOS, (__le16 *)data, len, |
| nls_cp); |
| } |
| data += 2 * (len + 1); |
| words_left -= len + 1; |
| |
| /* save off server network operating system */ |
| len = UniStrnlen((wchar_t *) data, words_left); |
| |
| if(len >= words_left) |
| return rc; |
| |
| if(ses->serverNOS) |
| kfree(ses->serverNOS); |
| ses->serverNOS = kzalloc(4 * len, GFP_KERNEL); /* BB this is wrong length FIXME BB */ |
| if(ses->serverNOS != NULL) { |
| cifs_strfromUCS_le(ses->serverNOS, (__le16 *)data, len, |
| nls_cp); |
| if(strncmp(ses->serverNOS, "NT LAN Manager 4",16) == 0) { |
| cFYI(1,("NT4 server")); |
| ses->flags |= CIFS_SES_NT4; |
| } |
| } |
| data += 2 * (len + 1); |
| words_left -= len + 1; |
| |
| /* save off server domain */ |
| len = UniStrnlen((wchar_t *) data, words_left); |
| |
| if(len > words_left) |
| return rc; |
| |
| if(ses->serverDomain) |
| kfree(ses->serverDomain); |
| ses->serverDomain = kzalloc(2 * (len + 1), GFP_KERNEL); /* BB FIXME wrong length */ |
| if(ses->serverDomain != NULL) { |
| cifs_strfromUCS_le(ses->serverDomain, (__le16 *)data, len, |
| nls_cp); |
| ses->serverDomain[2*len] = 0; |
| ses->serverDomain[(2*len) + 1] = 0; |
| } |
| data += 2 * (len + 1); |
| words_left -= len + 1; |
| |
| cFYI(1,("words left: %d",words_left)); |
| |
| return rc; |
| } |
| |
| static int decode_ascii_ssetup(char ** pbcc_area, int bleft, struct cifsSesInfo *ses, |
| const struct nls_table * nls_cp) |
| { |
| int rc = 0; |
| int len; |
| char * bcc_ptr = *pbcc_area; |
| |
| cFYI(1,("decode sessetup ascii. bleft %d", bleft)); |
| |
| len = strnlen(bcc_ptr, bleft); |
| if(len >= bleft) |
| return rc; |
| |
| if(ses->serverOS) |
| kfree(ses->serverOS); |
| |
| ses->serverOS = kzalloc(len + 1, GFP_KERNEL); |
| if(ses->serverOS) |
| strncpy(ses->serverOS, bcc_ptr, len); |
| if(strncmp(ses->serverOS, "OS/2",4) == 0) { |
| cFYI(1,("OS/2 server")); |
| ses->flags |= CIFS_SES_OS2; |
| } |
| |
| bcc_ptr += len + 1; |
| bleft -= len + 1; |
| |
| len = strnlen(bcc_ptr, bleft); |
| if(len >= bleft) |
| return rc; |
| |
| if(ses->serverNOS) |
| kfree(ses->serverNOS); |
| |
| ses->serverNOS = kzalloc(len + 1, GFP_KERNEL); |
| if(ses->serverNOS) |
| strncpy(ses->serverNOS, bcc_ptr, len); |
| |
| bcc_ptr += len + 1; |
| bleft -= len + 1; |
| |
| len = strnlen(bcc_ptr, bleft); |
| if(len > bleft) |
| return rc; |
| |
| /* No domain field in LANMAN case. Domain is |
| returned by old servers in the SMB negprot response */ |
| /* BB For newer servers which do not support Unicode, |
| but thus do return domain here we could add parsing |
| for it later, but it is not very important */ |
| cFYI(1,("ascii: bytes left %d",bleft)); |
| |
| return rc; |
| } |
| |
| int |
| CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time, |
| const struct nls_table *nls_cp) |
| { |
| int rc = 0; |
| int wct; |
| struct smb_hdr *smb_buf; |
| char *bcc_ptr; |
| char *str_area; |
| SESSION_SETUP_ANDX *pSMB; |
| __u32 capabilities; |
| int count; |
| int resp_buf_type = 0; |
| struct kvec iov[2]; |
| enum securityEnum type; |
| __u16 action; |
| int bytes_remaining; |
| |
| if(ses == NULL) |
| return -EINVAL; |
| |
| type = ses->server->secType; |
| |
| cFYI(1,("sess setup type %d",type)); |
| if(type == LANMAN) { |
| #ifndef CONFIG_CIFS_WEAK_PW_HASH |
| /* LANMAN and plaintext are less secure and off by default. |
| So we make this explicitly be turned on in kconfig (in the |
| build) and turned on at runtime (changed from the default) |
| in proc/fs/cifs or via mount parm. Unfortunately this is |
| needed for old Win (e.g. Win95), some obscure NAS and OS/2 */ |
| return -EOPNOTSUPP; |
| #endif |
| wct = 10; /* lanman 2 style sessionsetup */ |
| } else if((type == NTLM) || (type == NTLMv2)) { |
| /* For NTLMv2 failures eventually may need to retry NTLM */ |
| wct = 13; /* old style NTLM sessionsetup */ |
| } else /* same size for 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); |
| if(rc) |
| return rc; |
| |
| pSMB = (SESSION_SETUP_ANDX *)smb_buf; |
| |
| capabilities = cifs_ssetup_hdr(ses, pSMB); |
| |
| /* we will send the SMB in two pieces, |
| a fixed length beginning part, and a |
| second part which will include the strings |
| and rest of bcc area, in order to avoid having |
| to do a large buffer 17K allocation */ |
| iov[0].iov_base = (char *)pSMB; |
| iov[0].iov_len = smb_buf->smb_buf_length + 4; |
| |
| /* 2000 big enough to fit max user, domain, NOS name etc. */ |
| str_area = kmalloc(2000, GFP_KERNEL); |
| bcc_ptr = str_area; |
| |
| ses->flags &= ~CIFS_SES_LANMAN; |
| |
| if(type == LANMAN) { |
| #ifdef CONFIG_CIFS_WEAK_PW_HASH |
| char lnm_session_key[CIFS_SESS_KEY_SIZE]; |
| |
| /* no capabilities flags in old lanman negotiation */ |
| |
| pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE); |
| /* BB calculate hash with password */ |
| /* and copy into bcc */ |
| |
| calc_lanman_hash(ses, lnm_session_key); |
| ses->flags |= CIFS_SES_LANMAN; |
| /* #ifdef CONFIG_CIFS_DEBUG2 |
| cifs_dump_mem("cryptkey: ",ses->server->cryptKey, |
| CIFS_SESS_KEY_SIZE); |
| #endif */ |
| memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_SESS_KEY_SIZE); |
| bcc_ptr += CIFS_SESS_KEY_SIZE; |
| |
| /* can not sign if LANMAN negotiated so no need |
| to calculate signing key? but what if server |
| changed to do higher than lanman dialect and |
| we reconnected would we ever calc signing_key? */ |
| |
| cFYI(1,("Negotiating LANMAN setting up strings")); |
| /* Unicode not allowed for LANMAN dialects */ |
| ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); |
| #endif |
| } else if (type == NTLM) { |
| char ntlm_session_key[CIFS_SESS_KEY_SIZE]; |
| |
| pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); |
| pSMB->req_no_secext.CaseInsensitivePasswordLength = |
| cpu_to_le16(CIFS_SESS_KEY_SIZE); |
| pSMB->req_no_secext.CaseSensitivePasswordLength = |
| cpu_to_le16(CIFS_SESS_KEY_SIZE); |
| |
| /* calculate session key */ |
| SMBNTencrypt(ses->password, ses->server->cryptKey, |
| ntlm_session_key); |
| |
| if(first_time) /* should this be moved into common code |
| with similar ntlmv2 path? */ |
| cifs_calculate_mac_key(ses->server->mac_signing_key, |
| ntlm_session_key, ses->password); |
| /* copy session key */ |
| |
| memcpy(bcc_ptr, (char *)ntlm_session_key,CIFS_SESS_KEY_SIZE); |
| bcc_ptr += CIFS_SESS_KEY_SIZE; |
| memcpy(bcc_ptr, (char *)ntlm_session_key,CIFS_SESS_KEY_SIZE); |
| bcc_ptr += CIFS_SESS_KEY_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) { |
| char * v2_sess_key = |
| kmalloc(sizeof(struct ntlmv2_resp), GFP_KERNEL); |
| |
| /* BB FIXME change all users of v2_sess_key to |
| struct ntlmv2_resp */ |
| |
| if(v2_sess_key == NULL) { |
| cifs_small_buf_release(smb_buf); |
| return -ENOMEM; |
| } |
| |
| pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); |
| |
| /* LM2 password would be here if we supported it */ |
| pSMB->req_no_secext.CaseInsensitivePasswordLength = 0; |
| /* cpu_to_le16(LM2_SESS_KEY_SIZE); */ |
| |
| pSMB->req_no_secext.CaseSensitivePasswordLength = |
| cpu_to_le16(sizeof(struct ntlmv2_resp)); |
| |
| /* calculate session key */ |
| setup_ntlmv2_rsp(ses, v2_sess_key, nls_cp); |
| if(first_time) /* should this be moved into common code |
| with similar ntlmv2 path? */ |
| /* cifs_calculate_ntlmv2_mac_key(ses->server->mac_signing_key, |
| response BB FIXME, v2_sess_key); */ |
| |
| /* copy session key */ |
| |
| /* memcpy(bcc_ptr, (char *)ntlm_session_key,LM2_SESS_KEY_SIZE); |
| bcc_ptr += LM2_SESS_KEY_SIZE; */ |
| memcpy(bcc_ptr, (char *)v2_sess_key, sizeof(struct ntlmv2_resp)); |
| bcc_ptr += sizeof(struct ntlmv2_resp); |
| kfree(v2_sess_key); |
| 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 /* NTLMSSP or SPNEGO */ { |
| pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; |
| capabilities |= CAP_EXTENDED_SECURITY; |
| pSMB->req.Capabilities = cpu_to_le32(capabilities); |
| /* BB set password lengths */ |
| } |
| |
| count = (long) bcc_ptr - (long) str_area; |
| smb_buf->smb_buf_length += count; |
| |
| BCC_LE(smb_buf) = cpu_to_le16(count); |
| |
| iov[1].iov_base = str_area; |
| iov[1].iov_len = count; |
| rc = SendReceive2(xid, ses, iov, 2 /* num_iovecs */, &resp_buf_type, 0); |
| /* SMB request buf freed in SendReceive2 */ |
| |
| cFYI(1,("ssetup rc from sendrecv2 is %d",rc)); |
| if(rc) |
| goto ssetup_exit; |
| |
| pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base; |
| smb_buf = (struct smb_hdr *)iov[0].iov_base; |
| |
| if((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) { |
| rc = -EIO; |
| cERROR(1,("bad word count %d", smb_buf->WordCount)); |
| goto ssetup_exit; |
| } |
| action = le16_to_cpu(pSMB->resp.Action); |
| if (action & GUEST_LOGIN) |
| cFYI(1, ("Guest login")); /* BB mark SesInfo struct? */ |
| ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ |
| cFYI(1, ("UID = %d ", ses->Suid)); |
| /* response can have either 3 or 4 word count - Samba sends 3 */ |
| /* and lanman response is 3 */ |
| bytes_remaining = BCC(smb_buf); |
| bcc_ptr = pByteArea(smb_buf); |
| |
| if(smb_buf->WordCount == 4) { |
| __u16 blob_len; |
| blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); |
| bcc_ptr += blob_len; |
| if(blob_len > bytes_remaining) { |
| cERROR(1,("bad security blob length %d", blob_len)); |
| rc = -EINVAL; |
| goto ssetup_exit; |
| } |
| bytes_remaining -= blob_len; |
| } |
| |
| /* BB check if Unicode and decode strings */ |
| if(smb_buf->Flags2 & SMBFLG2_UNICODE) |
| rc = decode_unicode_ssetup(&bcc_ptr, bytes_remaining, |
| ses, nls_cp); |
| else |
| rc = decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,nls_cp); |
| |
| ssetup_exit: |
| kfree(str_area); |
| if(resp_buf_type == CIFS_SMALL_BUFFER) { |
| cFYI(1,("ssetup freeing small buf %p", 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); |
| |
| return rc; |
| } |