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[CIFS] NTLMv2 support part 5
NTLMv2 authentication (stronger authentication than default NTLM) which many servers support now works. There was a problem with the construction of the security blob in the older code. Currently requires /proc/fs/cifs/Experimental to be set to 2 and /proc/fs/cifs/SecurityFlags to be set to 0x4004 (to require using NTLMv2 instead of default of NTLM) Next we will check signing to make sure optional NTLMv2 packet signing also works. Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French
parent
f3ffb68144
commit
1717ffc588
@ -5,7 +5,9 @@ session setup needed for OS/2 and older servers such as Windows 95 and 98.
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Fix oops on ls to OS/2 servers. Add support for level 1 FindFirst
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so we can do search (ls etc.) to OS/2. Do not send NTCreateX
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or recent levels of FindFirst unless server says it supports NT SMBs
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(instead use legacy equivalents from LANMAN dialect).
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(instead use legacy equivalents from LANMAN dialect). Fix to allow
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NTLMv2 authentication support (now can use stronger password hashing
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on mount if corresponding /proc/fs/cifs/SecurityFlags is set (0x4004)
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Version 1.43
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------------
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@ -212,7 +212,8 @@ int cifs_calculate_mac_key(char * key, const char * rn, const char * password)
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return 0;
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}
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int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, struct nls_table * nls_info)
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int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses,
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const struct nls_table * nls_info)
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{
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char temp_hash[16];
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struct HMACMD5Context ctx;
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@ -305,13 +306,15 @@ void calc_lanman_hash(struct cifsSesInfo * ses, char * lnm_session_key)
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}
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#endif /* CIFS_WEAK_PW_HASH */
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static int calc_ntlmv2_hash(const struct cifsSesInfo *ses,
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char * ntv2_hash)
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static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
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const struct nls_table * nls_cp)
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{
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int rc = 0;
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int len;
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char nt_hash[16];
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struct HMACMD5Context * pctxt;
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wchar_t * user;
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wchar_t * domain;
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pctxt = kmalloc(sizeof(struct HMACMD5Context), GFP_KERNEL);
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@ -321,26 +324,44 @@ static int calc_ntlmv2_hash(const struct cifsSesInfo *ses,
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/* calculate md4 hash of password */
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E_md4hash(ses->password, nt_hash);
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/* convERT Domainname to unicode and uppercase */
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/* convert Domainname to unicode and uppercase */
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hmac_md5_init_limK_to_64(nt_hash, 16, pctxt);
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/* convert ses->userName to unicode and uppercase */
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/* len = ... */ /* BB FIXME BB */
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/* hmac_md5_update(user, len, pctxt); */
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len = strlen(ses->userName);
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user = kmalloc(2 + (len * 2), GFP_KERNEL);
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if(user == NULL)
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goto calc_exit_2;
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len = cifs_strtoUCS(user, ses->userName, len, nls_cp);
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UniStrupr(user);
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hmac_md5_update((char *)user, 2*len, pctxt);
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/* convert ses->domainName to unicode and uppercase */
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if(ses->domainName) {
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len = strlen(ses->domainName);
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/* len = ... */ /* BB FIXME BB */
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/* hmac_md5_update(domain, len, pctxt); */
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domain = kmalloc(2 + (len * 2), GFP_KERNEL);
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if(domain == NULL)
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goto calc_exit_1;
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len = cifs_strtoUCS(domain, ses->domainName, len, nls_cp);
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UniStrupr(domain);
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hmac_md5_final(ntv2_hash, pctxt);
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hmac_md5_update((char *)domain, 2*len, pctxt);
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kfree(domain);
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}
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calc_exit_1:
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kfree(user);
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calc_exit_2:
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/* BB FIXME what about bytes 24 through 40 of the signing key?
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compare with the NTLM example */
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hmac_md5_final(ses->server->mac_signing_key, pctxt);
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return rc;
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}
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void setup_ntlmv2_rsp(const struct cifsSesInfo * ses, char * resp_buf)
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void setup_ntlmv2_rsp(struct cifsSesInfo * ses, char * resp_buf,
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const struct nls_table * nls_cp)
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{
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int rc;
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struct ntlmv2_resp * buf = (struct ntlmv2_resp *)resp_buf;
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@ -348,27 +369,28 @@ void setup_ntlmv2_rsp(const struct cifsSesInfo * ses, char * resp_buf)
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buf->blob_signature = cpu_to_le32(0x00000101);
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buf->reserved = 0;
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buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
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get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
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get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
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buf->reserved2 = 0;
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buf->names[0].type = 0;
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buf->names[0].length = 0;
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/* calculate buf->ntlmv2_hash */
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rc = calc_ntlmv2_hash(ses,buf->ntlmv2_hash);
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rc = calc_ntlmv2_hash(ses, nls_cp);
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if(rc)
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cERROR(1,("could not get v2 hash rc %d",rc));
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CalcNTLMv2_response(ses, resp_buf);
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}
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void CalcNTLMv2_response(const struct cifsSesInfo * ses,char * v2_session_response)
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void CalcNTLMv2_response(const struct cifsSesInfo * ses, char * v2_session_response)
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{
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struct HMACMD5Context context;
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/* rest of v2 struct already generated */
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memcpy(v2_session_response + 8, ses->server->cryptKey,8);
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/* gen_blob(v2_session_response + 16); */
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hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context);
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hmac_md5_update(ses->server->cryptKey,8,&context);
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/* hmac_md5_update(v2_session_response+16)client thing,8,&context); */ /* BB fix */
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hmac_md5_update(v2_session_response+8,
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sizeof(struct ntlmv2_resp) - 8, &context);
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hmac_md5_final(v2_session_response,&context);
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cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); /* BB removeme BB */
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/* cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); */
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}
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@ -285,9 +285,11 @@ extern int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *,
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extern int cifs_verify_signature(struct smb_hdr *, const char * mac_key,
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__u32 expected_sequence_number);
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extern int cifs_calculate_mac_key(char * key,const char * rn,const char * pass);
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extern int CalcNTLMv2_partial_mac_key(struct cifsSesInfo *, struct nls_table *);
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extern void CalcNTLMv2_response(const struct cifsSesInfo *,char * );
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extern void setup_ntlmv2_rsp(const struct cifsSesInfo *, char *);
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extern int CalcNTLMv2_partial_mac_key(struct cifsSesInfo *,
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const struct nls_table *);
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extern void CalcNTLMv2_response(const struct cifsSesInfo *, char * );
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extern void setup_ntlmv2_rsp(struct cifsSesInfo *, char *,
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const struct nls_table *);
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#ifdef CONFIG_CIFS_WEAK_PW_HASH
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extern void calc_lanman_hash(struct cifsSesInfo * ses, char * lnm_session_key);
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#endif /* CIFS_WEAK_PW_HASH */
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@ -432,7 +432,7 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
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cpu_to_le16(sizeof(struct ntlmv2_resp));
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/* calculate session key */
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setup_ntlmv2_rsp(ses, v2_sess_key);
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setup_ntlmv2_rsp(ses, v2_sess_key, nls_cp);
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if(first_time) /* should this be moved into common code
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with similar ntlmv2 path? */
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/* cifs_calculate_ntlmv2_mac_key(ses->server->mac_signing_key,
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