From b609f06ac4ac77433035366e9aa4dcd7a0f743a0 Mon Sep 17 00:00:00 2001 From: Steve French Date: Mon, 9 Jul 2007 07:55:14 +0000 Subject: [CIFS] Fix packet signatures for NTLMv2 case Signed-off-by: Yehuda Sadeh Weinraub Signed-off-by: Steve French --- fs/cifs/cifsencrypt.c | 63 ++++++++++++++++++++++++++++++++------------------- 1 file changed, 40 insertions(+), 23 deletions(-) (limited to 'fs/cifs/cifsencrypt.c') diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c index 8422df81b994..860dc49ba79c 100644 --- a/fs/cifs/cifsencrypt.c +++ b/fs/cifs/cifsencrypt.c @@ -41,16 +41,17 @@ extern void SMBencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24); static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu, - const char *key, char *signature) + 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_SESS_KEY_SIZE+16); + MD5Update(&context, (char *)&key->data, key->len); MD5Update(&context, cifs_pdu->Protocol, cifs_pdu->smb_buf_length); + MD5Final(signature, &context); return 0; } @@ -76,7 +77,7 @@ int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server, server->sequence_number++; spin_unlock(&GlobalMid_Lock); - rc = cifs_calculate_signature(cifs_pdu, server->mac_signing_key, + rc = cifs_calculate_signature(cifs_pdu, &server->mac_signing_key, smb_signature); if (rc) memset(cifs_pdu->Signature.SecuritySignature, 0, 8); @@ -87,16 +88,16 @@ int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server, } static int cifs_calc_signature2(const struct kvec *iov, int n_vec, - const char *key, char *signature) + const struct mac_key *key, char *signature) { struct MD5Context context; int i; - if ((iov == NULL) || (signature == NULL)) + if ((iov == NULL) || (signature == NULL) || (key == NULL)) return -EINVAL; MD5Init(&context); - MD5Update(&context, key, CIFS_SESS_KEY_SIZE+16); + MD5Update(&context, (char *)&key->data, key->len); for (i=0;isequence_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); @@ -151,7 +152,8 @@ int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server, return rc; } -int cifs_verify_signature(struct smb_hdr *cifs_pdu, const char *mac_key, +int cifs_verify_signature(struct smb_hdr *cifs_pdu, + const struct mac_key *mac_key, __u32 expected_sequence_number) { unsigned int rc; @@ -202,15 +204,17 @@ 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_SESS_KEY_SIZE); + mdfour(key->data.ntlm, temp_key, 16); + memcpy(key->data.ntlm+16, rn, CIFS_SESS_KEY_SIZE); + key->len = 40; return 0; } @@ -235,35 +239,35 @@ int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, 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); 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); 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; @@ -347,7 +351,10 @@ static int calc_ntlmv2_hash(struct cifsSesInfo *ses, if(domain == NULL) goto calc_exit_1; len = cifs_strtoUCS(domain, ses->domainName, len, nls_cp); - UniStrupr(domain); + /* 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); @@ -358,7 +365,7 @@ calc_exit_1: 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->mac_signing_key, pctxt); + hmac_md5_final(ses->server->ntlmv2_hash, pctxt); return rc; } @@ -368,6 +375,7 @@ void setup_ntlmv2_rsp(struct cifsSesInfo * ses, char * resp_buf, { int rc; struct ntlmv2_resp * buf = (struct ntlmv2_resp *)resp_buf; + struct HMACMD5Context context; buf->blob_signature = cpu_to_le32(0x00000101); buf->reserved = 0; @@ -384,6 +392,15 @@ void setup_ntlmv2_rsp(struct cifsSesInfo * ses, char * resp_buf, 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) @@ -391,9 +408,9 @@ void CalcNTLMv2_response(const struct cifsSesInfo * ses, char * v2_session_respo struct HMACMD5Context context; /* rest of v2 struct already generated */ memcpy(v2_session_response + 8, ses->server->cryptKey,8); - hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context); + hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context); - hmac_md5_update(v2_session_response+8, + hmac_md5_update(v2_session_response+8, sizeof(struct ntlmv2_resp) - 8, &context); hmac_md5_final(v2_session_response,&context); -- cgit v1.2.3