X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fcifs%2Fcifsencrypt.c;h=7efe1745494d10a4968ef09f308af577d6ccc1c9;hb=cf6e693212263d33c5882e4653df89a2fca4c0c4;hp=a2c24858d40f94f449de0e958c7971b31c3fff61;hpb=84afc29b185334f489975a003b128e1b15e24a54;p=safe%2Fjmp%2Flinux-2.6 diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c index a2c2485..7efe174 100644 --- a/fs/cifs/cifsencrypt.c +++ b/fs/cifs/cifsencrypt.c @@ -1,7 +1,7 @@ /* * fs/cifs/cifsencrypt.c * - * Copyright (C) International Business Machines Corp., 2005 + * Copyright (C) International Business Machines Corp., 2005,2006 * Author(s): Steve French (sfrench@us.ibm.com) * * This library is free software; you can redistribute it and/or modify @@ -21,60 +21,65 @@ #include #include "cifspdu.h" -#include "cifsglob.h" +#include "cifsglob.h" #include "cifs_debug.h" #include "md5.h" #include "cifs_unicode.h" #include "cifsproto.h" +#include +#include -/* Calculate and return the CIFS signature based on the mac key and the smb pdu */ +/* Calculate and return the CIFS signature based on the mac key and SMB PDU */ /* the 16 byte signature must be allocated by the caller */ /* Note we only use the 1st eight bytes */ -/* Note that the smb header signature field on input contains the +/* Note that the smb header signature field on input contains the sequence number before this function is called */ extern void mdfour(unsigned char *out, unsigned char *in, int n); extern void E_md4hash(const unsigned char *passwd, unsigned char *p16); - -static int cifs_calculate_signature(const struct smb_hdr * cifs_pdu, const char * key, char * signature) +extern void SMBencrypt(unsigned char *passwd, const unsigned char *c8, + unsigned char *p24); + +static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu, + const struct mac_key *key, char *signature) { struct MD5Context context; - if((cifs_pdu == NULL) || (signature == NULL)) + if ((cifs_pdu == NULL) || (signature == NULL) || (key == NULL)) return -EINVAL; - MD5Init(&context); - MD5Update(&context,key,CIFS_SESSION_KEY_SIZE+16); - MD5Update(&context,cifs_pdu->Protocol,cifs_pdu->smb_buf_length); - MD5Final(signature,&context); + cifs_MD5_init(&context); + cifs_MD5_update(&context, (char *)&key->data, key->len); + cifs_MD5_update(&context, cifs_pdu->Protocol, cifs_pdu->smb_buf_length); + + cifs_MD5_final(signature, &context); return 0; } -int cifs_sign_smb(struct smb_hdr * cifs_pdu, struct TCP_Server_Info * server, - __u32 * pexpected_response_sequence_number) +int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server, + __u32 *pexpected_response_sequence_number) { int rc = 0; char smb_signature[20]; - /* BB remember to initialize sequence number elsewhere and initialize mac_signing key elsewhere BB */ - /* BB remember to add code to save expected sequence number in midQ entry BB */ - - if((cifs_pdu == NULL) || (server == NULL)) + if ((cifs_pdu == NULL) || (server == NULL)) return -EINVAL; - if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0) + if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0) return rc; spin_lock(&GlobalMid_Lock); - cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(server->sequence_number); + cifs_pdu->Signature.Sequence.SequenceNumber = + cpu_to_le32(server->sequence_number); cifs_pdu->Signature.Sequence.Reserved = 0; - + *pexpected_response_sequence_number = server->sequence_number++; server->sequence_number++; spin_unlock(&GlobalMid_Lock); - rc = cifs_calculate_signature(cifs_pdu, server->mac_signing_key,smb_signature); - if(rc) + rc = cifs_calculate_signature(cifs_pdu, &server->mac_signing_key, + smb_signature); + if (rc) memset(cifs_pdu->Signature.SecuritySignature, 0, 8); else memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); @@ -82,102 +87,120 @@ int cifs_sign_smb(struct smb_hdr * cifs_pdu, struct TCP_Server_Info * server, return rc; } -static int cifs_calc_signature2(const struct kvec * iov, int n_vec, - const char * key, char * signature) +static int cifs_calc_signature2(const struct kvec *iov, int n_vec, + const struct mac_key *key, char *signature) { - struct MD5Context context; - - if((iov == NULL) || (signature == NULL)) - return -EINVAL; + struct MD5Context context; + int i; - MD5Init(&context); - MD5Update(&context,key,CIFS_SESSION_KEY_SIZE+16); + if ((iov == NULL) || (signature == NULL) || (key == NULL)) + return -EINVAL; -/* MD5Update(&context,cifs_pdu->Protocol,cifs_pdu->smb_buf_length); */ /* BB FIXME BB */ + cifs_MD5_init(&context); + cifs_MD5_update(&context, (char *)&key->data, key->len); + for (i = 0; i < n_vec; i++) { + if (iov[i].iov_len == 0) + continue; + if (iov[i].iov_base == NULL) { + cERROR(1, ("null iovec entry")); + return -EIO; + } + /* The first entry includes a length field (which does not get + signed that occupies the first 4 bytes before the header */ + if (i == 0) { + if (iov[0].iov_len <= 8) /* cmd field at offset 9 */ + break; /* nothing to sign or corrupt header */ + cifs_MD5_update(&context, iov[0].iov_base+4, + iov[0].iov_len-4); + } else + cifs_MD5_update(&context, iov[i].iov_base, iov[i].iov_len); + } - MD5Final(signature,&context); + cifs_MD5_final(signature, &context); - return -EOPNOTSUPP; -/* return 0; */ + return 0; } -int cifs_sign_smb2(struct kvec * iov, int n_vec, struct TCP_Server_Info *server, - __u32 * pexpected_response_sequence_number) +int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server, + __u32 *pexpected_response_sequence_number) { int rc = 0; char smb_signature[20]; - struct smb_hdr * cifs_pdu = iov[0].iov_base; + struct smb_hdr *cifs_pdu = iov[0].iov_base; - if((cifs_pdu == NULL) || (server == NULL)) + if ((cifs_pdu == NULL) || (server == NULL)) return -EINVAL; - if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0) + if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0) return rc; - spin_lock(&GlobalMid_Lock); - cifs_pdu->Signature.Sequence.SequenceNumber = + spin_lock(&GlobalMid_Lock); + cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(server->sequence_number); - cifs_pdu->Signature.Sequence.Reserved = 0; + cifs_pdu->Signature.Sequence.Reserved = 0; - *pexpected_response_sequence_number = server->sequence_number++; - server->sequence_number++; - spin_unlock(&GlobalMid_Lock); + *pexpected_response_sequence_number = server->sequence_number++; + server->sequence_number++; + spin_unlock(&GlobalMid_Lock); - rc = cifs_calc_signature2(iov, n_vec, server->mac_signing_key, + rc = cifs_calc_signature2(iov, n_vec, &server->mac_signing_key, smb_signature); - if(rc) - memset(cifs_pdu->Signature.SecuritySignature, 0, 8); - else - memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); - - return rc; + if (rc) + memset(cifs_pdu->Signature.SecuritySignature, 0, 8); + else + memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); + return rc; } -int cifs_verify_signature(struct smb_hdr * cifs_pdu, const char * mac_key, - __u32 expected_sequence_number) +int cifs_verify_signature(struct smb_hdr *cifs_pdu, + const struct mac_key *mac_key, + __u32 expected_sequence_number) { unsigned int rc; char server_response_sig[8]; char what_we_think_sig_should_be[20]; - if((cifs_pdu == NULL) || (mac_key == NULL)) + if ((cifs_pdu == NULL) || (mac_key == NULL)) return -EINVAL; if (cifs_pdu->Command == SMB_COM_NEGOTIATE) return 0; if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) { - struct smb_com_lock_req * pSMB = (struct smb_com_lock_req *)cifs_pdu; - if(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) + struct smb_com_lock_req *pSMB = + (struct smb_com_lock_req *)cifs_pdu; + if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) return 0; } - /* BB what if signatures are supposed to be on for session but server does not - send one? BB */ - + /* BB what if signatures are supposed to be on for session but + server does not send one? BB */ + /* Do not need to verify session setups with signature "BSRSPYL " */ - if(memcmp(cifs_pdu->Signature.SecuritySignature,"BSRSPYL ",8)==0) - cFYI(1,("dummy signature received for smb command 0x%x",cifs_pdu->Command)); + if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0) + cFYI(1, ("dummy signature received for smb command 0x%x", + cifs_pdu->Command)); /* save off the origiginal signature so we can modify the smb and check its signature against what the server sent */ - memcpy(server_response_sig,cifs_pdu->Signature.SecuritySignature,8); + memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8); - cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(expected_sequence_number); + cifs_pdu->Signature.Sequence.SequenceNumber = + cpu_to_le32(expected_sequence_number); cifs_pdu->Signature.Sequence.Reserved = 0; rc = cifs_calculate_signature(cifs_pdu, mac_key, what_we_think_sig_should_be); - if(rc) + if (rc) return rc; - -/* cifs_dump_mem("what we think it should be: ",what_we_think_sig_should_be,16); */ +/* cifs_dump_mem("what we think it should be: ", + what_we_think_sig_should_be, 16); */ - if(memcmp(server_response_sig, what_we_think_sig_should_be, 8)) + if (memcmp(server_response_sig, what_we_think_sig_should_be, 8)) return -EACCES; else return 0; @@ -185,78 +208,219 @@ int cifs_verify_signature(struct smb_hdr * cifs_pdu, const char * mac_key, } /* We fill in key by putting in 40 byte array which was allocated by caller */ -int cifs_calculate_mac_key(char * key, const char * rn, const char * password) +int cifs_calculate_mac_key(struct mac_key *key, const char *rn, + const char *password) { char temp_key[16]; if ((key == NULL) || (rn == NULL)) return -EINVAL; E_md4hash(password, temp_key); - mdfour(key,temp_key,16); - memcpy(key+16,rn, CIFS_SESSION_KEY_SIZE); + mdfour(key->data.ntlm, temp_key, 16); + memcpy(key->data.ntlm+16, rn, CIFS_SESS_KEY_SIZE); + key->len = 40; return 0; } -int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, struct nls_table * nls_info) +int CalcNTLMv2_partial_mac_key(struct cifsSesInfo *ses, + const struct nls_table *nls_info) { char temp_hash[16]; struct HMACMD5Context ctx; - char * ucase_buf; - __le16 * unicode_buf; - unsigned int i,user_name_len,dom_name_len; + char *ucase_buf; + __le16 *unicode_buf; + unsigned int i, user_name_len, dom_name_len; - if(ses == NULL) + if (ses == NULL) return -EINVAL; E_md4hash(ses->password, temp_hash); hmac_md5_init_limK_to_64(temp_hash, 16, &ctx); user_name_len = strlen(ses->userName); - if(user_name_len > MAX_USERNAME_SIZE) + if (user_name_len > MAX_USERNAME_SIZE) return -EINVAL; + if (ses->domainName == NULL) + return -EINVAL; /* BB should we use CIFS_LINUX_DOM */ dom_name_len = strlen(ses->domainName); - if(dom_name_len > MAX_USERNAME_SIZE) + if (dom_name_len > MAX_USERNAME_SIZE) return -EINVAL; - + ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL); - if(ucase_buf == NULL) + if (ucase_buf == NULL) return -ENOMEM; unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL); - if(unicode_buf == NULL) { + if (unicode_buf == NULL) { kfree(ucase_buf); return -ENOMEM; } - - for(i=0;icharset2upper[(int)ses->userName[i]]; ucase_buf[i] = 0; - user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf, MAX_USERNAME_SIZE*2, nls_info); + user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf, + MAX_USERNAME_SIZE*2, nls_info); unicode_buf[user_name_len] = 0; user_name_len++; - for(i=0;icharset2upper[(int)ses->domainName[i]]; ucase_buf[i] = 0; - dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf, MAX_USERNAME_SIZE*2, nls_info); + dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf, + MAX_USERNAME_SIZE*2, nls_info); unicode_buf[user_name_len + dom_name_len] = 0; hmac_md5_update((const unsigned char *) unicode_buf, - (user_name_len+dom_name_len)*2,&ctx); + (user_name_len+dom_name_len)*2, &ctx); - hmac_md5_final(ses->server->mac_signing_key,&ctx); + hmac_md5_final(ses->server->ntlmv2_hash, &ctx); kfree(ucase_buf); kfree(unicode_buf); return 0; } -void CalcNTLMv2_response(const struct cifsSesInfo * ses,char * v2_session_response) + +#ifdef CONFIG_CIFS_WEAK_PW_HASH +void calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt, + char *lnm_session_key) +{ + int i; + char password_with_pad[CIFS_ENCPWD_SIZE]; + + memset(password_with_pad, 0, CIFS_ENCPWD_SIZE); + if (password) + strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE); + + if (!encrypt && extended_security & CIFSSEC_MAY_PLNTXT) { + memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE); + memcpy(lnm_session_key, password_with_pad, + CIFS_ENCPWD_SIZE); + return; + } + + /* calculate old style session key */ + /* calling toupper is less broken than repeatedly + calling nls_toupper would be since that will never + work for UTF8, but neither handles multibyte code pages + but the only alternative would be converting to UCS-16 (Unicode) + (using a routine something like UniStrupr) then + uppercasing and then converting back from Unicode - which + would only worth doing it if we knew it were utf8. Basically + utf8 and other multibyte codepages each need their own strupper + function since a byte at a time will ont work. */ + + for (i = 0; i < CIFS_ENCPWD_SIZE; i++) + password_with_pad[i] = toupper(password_with_pad[i]); + + SMBencrypt(password_with_pad, cryptkey, lnm_session_key); + + /* clear password before we return/free memory */ + memset(password_with_pad, 0, CIFS_ENCPWD_SIZE); +} +#endif /* CIFS_WEAK_PW_HASH */ + +static int calc_ntlmv2_hash(struct cifsSesInfo *ses, + const struct nls_table *nls_cp) +{ + int rc = 0; + int len; + char nt_hash[16]; + struct HMACMD5Context *pctxt; + wchar_t *user; + wchar_t *domain; + + pctxt = kmalloc(sizeof(struct HMACMD5Context), GFP_KERNEL); + + if (pctxt == NULL) + return -ENOMEM; + + /* calculate md4 hash of password */ + E_md4hash(ses->password, nt_hash); + + /* convert Domainname to unicode and uppercase */ + hmac_md5_init_limK_to_64(nt_hash, 16, pctxt); + + /* convert ses->userName to unicode and uppercase */ + len = strlen(ses->userName); + user = kmalloc(2 + (len * 2), GFP_KERNEL); + if (user == NULL) + goto calc_exit_2; + len = cifs_strtoUCS((__le16 *)user, ses->userName, len, nls_cp); + UniStrupr(user); + hmac_md5_update((char *)user, 2*len, pctxt); + + /* convert ses->domainName to unicode and uppercase */ + if (ses->domainName) { + len = strlen(ses->domainName); + + domain = kmalloc(2 + (len * 2), GFP_KERNEL); + if (domain == NULL) + goto calc_exit_1; + len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len, + nls_cp); + /* the following line was removed since it didn't work well + with lower cased domain name that passed as an option. + Maybe converting the domain name earlier makes sense */ + /* UniStrupr(domain); */ + + hmac_md5_update((char *)domain, 2*len, pctxt); + + kfree(domain); + } +calc_exit_1: + kfree(user); +calc_exit_2: + /* BB FIXME what about bytes 24 through 40 of the signing key? + compare with the NTLM example */ + hmac_md5_final(ses->server->ntlmv2_hash, pctxt); + + kfree(pctxt); + return rc; +} + +void setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf, + const struct nls_table *nls_cp) +{ + int rc; + struct ntlmv2_resp *buf = (struct ntlmv2_resp *)resp_buf; + struct HMACMD5Context context; + + buf->blob_signature = cpu_to_le32(0x00000101); + buf->reserved = 0; + buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME)); + get_random_bytes(&buf->client_chal, sizeof(buf->client_chal)); + buf->reserved2 = 0; + buf->names[0].type = cpu_to_le16(NTLMSSP_DOMAIN_TYPE); + buf->names[0].length = 0; + buf->names[1].type = 0; + buf->names[1].length = 0; + + /* calculate buf->ntlmv2_hash */ + rc = calc_ntlmv2_hash(ses, nls_cp); + if (rc) + cERROR(1, ("could not get v2 hash rc %d", rc)); + CalcNTLMv2_response(ses, resp_buf); + + /* now calculate the MAC key for NTLMv2 */ + hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context); + hmac_md5_update(resp_buf, 16, &context); + hmac_md5_final(ses->server->mac_signing_key.data.ntlmv2.key, &context); + + memcpy(&ses->server->mac_signing_key.data.ntlmv2.resp, resp_buf, + sizeof(struct ntlmv2_resp)); + ses->server->mac_signing_key.len = 16 + sizeof(struct ntlmv2_resp); +} + +void CalcNTLMv2_response(const struct cifsSesInfo *ses, + char *v2_session_response) { struct HMACMD5Context context; - memcpy(v2_session_response + 8, ses->server->cryptKey,8); - /* gen_blob(v2_session_response + 16); */ - hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context); + /* rest of v2 struct already generated */ + memcpy(v2_session_response + 8, ses->server->cryptKey, 8); + hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context); - hmac_md5_update(ses->server->cryptKey,8,&context); -/* hmac_md5_update(v2_session_response+16)client thing,8,&context); */ /* BB fix */ + hmac_md5_update(v2_session_response+8, + sizeof(struct ntlmv2_resp) - 8, &context); - hmac_md5_final(v2_session_response,&context); + hmac_md5_final(v2_session_response, &context); +/* cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); */ }