From 5d0d28824c76409f0d1a645bf0ae81318c8ffa42 Mon Sep 17 00:00:00 2001 From: Shirish Pargaonkar Date: Wed, 13 Oct 2010 18:15:00 -0500 Subject: NTLM authentication and signing - Calculate auth response per smb session Start calculation auth response within a session. Move/Add pertinet data structures like session key, server challenge and ntlmv2_hash in a session structure. We should do the calculations within a session before copying session key and response over to server data structures because a session setup can fail. Only after a very first smb session succeeds, it copies/makes its session key, session key of smb connection. This key stays with the smb connection throughout its life. Signed-off-by: Shirish Pargaonkar Reviewed-by: Jeff Layton Signed-off-by: Steve French --- fs/cifs/cifsencrypt.c | 16 ++++++++-------- fs/cifs/cifsglob.h | 6 ++++-- fs/cifs/cifssmb.c | 4 ++-- fs/cifs/connect.c | 18 ++++++++++++++---- fs/cifs/sess.c | 28 ++++++++-------------------- 5 files changed, 36 insertions(+), 36 deletions(-) (limited to 'fs') diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c index e3edd8a6840..7ac0056294c 100644 --- a/fs/cifs/cifsencrypt.c +++ b/fs/cifs/cifsencrypt.c @@ -458,7 +458,7 @@ 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->ntlmv2_hash, pctxt); + hmac_md5_final(ses->ntlmv2_hash, pctxt); kfree(pctxt); return rc; @@ -502,14 +502,14 @@ setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf, } CalcNTLMv2_response(ses, resp_buf); - /* now calculate the MAC key for NTLMv2 */ - hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context); + /* now calculate the session key for NTLMv2 */ + hmac_md5_init_limK_to_64(ses->ntlmv2_hash, 16, &context); hmac_md5_update(resp_buf, 16, &context); - hmac_md5_final(ses->server->session_key.data.ntlmv2.key, &context); + hmac_md5_final(ses->auth_key.data.ntlmv2.key, &context); - memcpy(&ses->server->session_key.data.ntlmv2.resp, resp_buf, + memcpy(&ses->auth_key.data.ntlmv2.resp, resp_buf, sizeof(struct ntlmv2_resp)); - ses->server->session_key.len = 16 + sizeof(struct ntlmv2_resp); + ses->auth_key.len = 16 + sizeof(struct ntlmv2_resp); return 0; @@ -526,8 +526,8 @@ void CalcNTLMv2_response(const struct cifsSesInfo *ses, { 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->ntlmv2_hash, 16, &context); + memcpy(v2_session_response + 8, ses->cryptKey, 8); + hmac_md5_init_limK_to_64(ses->ntlmv2_hash, 16, &context); hmac_md5_update(v2_session_response+8, sizeof(struct ntlmv2_resp) - 8, &context); diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index e2b760ef22f..6c69bd76249 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -179,12 +179,10 @@ struct TCP_Server_Info { int capabilities; /* allow selective disabling of caps by smb sess */ int timeAdj; /* Adjust for difference in server time zone in sec */ __u16 CurrentMid; /* multiplex id - rotating counter */ - char cryptKey[CIFS_CRYPTO_KEY_SIZE]; /* 16th byte of RFC1001 workstation name is always null */ char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL]; __u32 sequence_number; /* needed for CIFS PDU signature */ struct session_key session_key; - char ntlmv2_hash[16]; unsigned long lstrp; /* when we got last response from this server */ u16 dialect; /* dialect index that server chose */ /* extended security flavors that server supports */ @@ -192,6 +190,7 @@ struct TCP_Server_Info { bool sec_mskerberos; /* supports legacy MS Kerberos */ bool sec_kerberosu2u; /* supports U2U Kerberos */ bool sec_ntlmssp; /* supports NTLMSSP */ + bool session_estab; /* mark when very first sess is established */ #ifdef CONFIG_CIFS_FSCACHE struct fscache_cookie *fscache; /* client index cache cookie */ #endif @@ -223,6 +222,9 @@ struct cifsSesInfo { char userName[MAX_USERNAME_SIZE + 1]; char *domainName; char *password; + char cryptKey[CIFS_CRYPTO_KEY_SIZE]; + struct session_key auth_key; + char ntlmv2_hash[16]; unsigned int tilen; /* length of the target info blob */ unsigned char *tiblob; /* target info blob in challenge response */ bool need_reconnect:1; /* connection reset, uid now invalid */ diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index 54bd83af772..a420c7b0852 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -503,7 +503,7 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses) if (rsp->EncryptionKeyLength == cpu_to_le16(CIFS_CRYPTO_KEY_SIZE)) { - memcpy(server->cryptKey, rsp->EncryptionKey, + memcpy(ses->cryptKey, rsp->EncryptionKey, CIFS_CRYPTO_KEY_SIZE); } else if (server->secMode & SECMODE_PW_ENCRYPT) { rc = -EIO; /* need cryptkey unless plain text */ @@ -574,7 +574,7 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses) server->timeAdj = (int)(__s16)le16_to_cpu(pSMBr->ServerTimeZone); server->timeAdj *= 60; if (pSMBr->EncryptionKeyLength == CIFS_CRYPTO_KEY_SIZE) { - memcpy(server->cryptKey, pSMBr->u.EncryptionKey, + memcpy(ses->cryptKey, pSMBr->u.EncryptionKey, CIFS_CRYPTO_KEY_SIZE); } else if ((pSMBr->hdr.Flags2 & SMBFLG2_EXT_SEC) && (pSMBr->EncryptionKeyLength == 0)) { diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 4944fc84d5e..019f00380d1 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -173,6 +173,8 @@ cifs_reconnect(struct TCP_Server_Info *server) sock_release(server->ssocket); server->ssocket = NULL; } + server->sequence_number = 0; + server->session_estab = false; spin_lock(&GlobalMid_Lock); list_for_each(tmp, &server->pending_mid_q) { @@ -205,7 +207,6 @@ cifs_reconnect(struct TCP_Server_Info *server) spin_lock(&GlobalMid_Lock); if (server->tcpStatus != CifsExiting) server->tcpStatus = CifsGood; - server->sequence_number = 0; spin_unlock(&GlobalMid_Lock); /* atomic_set(&server->inFlight,0);*/ wake_up(&server->response_q); @@ -1631,6 +1632,7 @@ cifs_get_tcp_session(struct smb_vol *volume_info) volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL); memcpy(tcp_ses->server_RFC1001_name, volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL); + tcp_ses->session_estab = false; tcp_ses->sequence_number = 0; INIT_LIST_HEAD(&tcp_ses->tcp_ses_list); INIT_LIST_HEAD(&tcp_ses->smb_ses_list); @@ -2983,14 +2985,13 @@ CIFSTCon(unsigned int xid, struct cifsSesInfo *ses, #ifdef CONFIG_CIFS_WEAK_PW_HASH if ((global_secflags & CIFSSEC_MAY_LANMAN) && (ses->server->secType == LANMAN)) - calc_lanman_hash(tcon->password, ses->server->cryptKey, + calc_lanman_hash(tcon->password, ses->cryptKey, ses->server->secMode & SECMODE_PW_ENCRYPT ? true : false, bcc_ptr); else #endif /* CIFS_WEAK_PW_HASH */ - SMBNTencrypt(tcon->password, ses->server->cryptKey, - bcc_ptr); + SMBNTencrypt(tcon->password, ses->cryptKey, bcc_ptr); bcc_ptr += CIFS_SESS_KEY_SIZE; if (ses->capabilities & CAP_UNICODE) { @@ -3175,6 +3176,15 @@ int cifs_setup_session(unsigned int xid, struct cifsSesInfo *ses, if (rc) { cERROR(1, "Send error in SessSetup = %d", rc); } else { + mutex_lock(&ses->server->srv_mutex); + if (!server->session_estab) { + memcpy(&server->session_key.data, + &ses->auth_key.data, ses->auth_key.len); + server->session_key.len = ses->auth_key.len; + ses->server->session_estab = true; + } + mutex_unlock(&server->srv_mutex); + cFYI(1, "CIFS Session Established successfully"); spin_lock(&GlobalMid_Lock); ses->status = CifsGood; diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c index c926e6c7c0c..2111bed71b1 100644 --- a/fs/cifs/sess.c +++ b/fs/cifs/sess.c @@ -402,7 +402,7 @@ static int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len, return -EINVAL; } - memcpy(ses->server->cryptKey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE); + memcpy(ses->cryptKey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE); /* BB we could decode pblob->NegotiateFlags; some may be useful */ /* In particular we can examine sign flags */ /* BB spec says that if AvId field of MsvAvTimestamp is populated then @@ -591,17 +591,12 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int bytes_remaining; struct key *spnego_key = NULL; __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */ - bool first_time; int blob_len; char *ntlmsspblob = NULL; if (ses == NULL) return -EINVAL; - read_lock(&cifs_tcp_ses_lock); - first_time = is_first_ses_reconnect(ses); - read_unlock(&cifs_tcp_ses_lock); - type = ses->server->secType; cFYI(1, "sess setup type %d", type); @@ -672,7 +667,7 @@ ssetup_ntlmssp_authenticate: /* BB calculate hash with password */ /* and copy into bcc */ - calc_lanman_hash(ses->password, ses->server->cryptKey, + calc_lanman_hash(ses->password, ses->cryptKey, ses->server->secMode & SECMODE_PW_ENCRYPT ? true : false, lnm_session_key); @@ -699,15 +694,11 @@ ssetup_ntlmssp_authenticate: cpu_to_le16(CIFS_SESS_KEY_SIZE); /* calculate session key */ - SMBNTencrypt(ses->password, ses->server->cryptKey, - ntlm_session_key); + SMBNTencrypt(ses->password, ses->cryptKey, ntlm_session_key); - if (first_time) /* should this be moved into common code - with similar ntlmv2 path? */ - cifs_calculate_session_key(&ses->server->session_key, - ntlm_session_key, ses->password); + cifs_calculate_session_key(&ses->auth_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); @@ -794,17 +785,14 @@ ssetup_ntlmssp_authenticate: } /* bail out if key is too long */ if (msg->sesskey_len > - sizeof(ses->server->session_key.data.krb5)) { + sizeof(ses->auth_key.data.krb5)) { cERROR(1, "Kerberos signing key too long (%u bytes)", msg->sesskey_len); rc = -EOVERFLOW; goto ssetup_exit; } - if (first_time) { - ses->server->session_key.len = msg->sesskey_len; - memcpy(ses->server->session_key.data.krb5, - msg->data, msg->sesskey_len); - } + ses->auth_key.len = msg->sesskey_len; + memcpy(ses->auth_key.data.krb5, msg->data, msg->sesskey_len); pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; capabilities |= CAP_EXTENDED_SECURITY; pSMB->req.Capabilities = cpu_to_le32(capabilities); -- cgit v1.2.3