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[PATCH] cifs: Fix multiuser packet signing to use the right sequence number and mac session key

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Signed-off-by: Steve French (sfrench@us.ibm.com)
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Steve French 2005-04-28 22:41:05 -07:00 committed by Linus Torvalds
parent c67593a031
commit ad009ac965
6 changed files with 50 additions and 32 deletions
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3
fs/cifs/CHANGES
View file

@ -5,7 +5,8 @@ transact response for an SMB request and search entry split across two frames.
Add support for lsattr (getting ext2/ext3/reiserfs attr flags from the server)
as new protocol extensions. Do not send Get/Set calls for POSIX ACLs
unless server explicitly claims to support them in CIFS Unix extensions
POSIX ACL capability bit.
POSIX ACL capability bit. Fix packet signing when multiuser mounting with
different users from the same client to the same server.
Version 1.31
------------

16
fs/cifs/cifsencrypt.c
View file

@ -50,7 +50,7 @@ static int cifs_calculate_signature(const struct smb_hdr * cifs_pdu, const char
return 0;
}
int cifs_sign_smb(struct smb_hdr * cifs_pdu, struct cifsSesInfo * ses,
int cifs_sign_smb(struct smb_hdr * cifs_pdu, struct TCP_Server_Info * server,
__u32 * pexpected_response_sequence_number)
{
int rc = 0;
@ -59,21 +59,21 @@ int cifs_sign_smb(struct smb_hdr * cifs_pdu, struct cifsSesInfo * ses,
/* 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) || (ses == NULL))
if((cifs_pdu == NULL) || (server == NULL))
return -EINVAL;
if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
return rc;
spin_lock(&GlobalMid_Lock);
cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(ses->sequence_number);
cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(server->sequence_number);
cifs_pdu->Signature.Sequence.Reserved = 0;
*pexpected_response_sequence_number = ses->sequence_number++;
ses->sequence_number++;
*pexpected_response_sequence_number = server->sequence_number++;
server->sequence_number++;
spin_unlock(&GlobalMid_Lock);
rc = cifs_calculate_signature(cifs_pdu, ses->mac_signing_key,smb_signature);
rc = cifs_calculate_signature(cifs_pdu, server->mac_signing_key,smb_signature);
if(rc)
memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
else
@ -190,7 +190,7 @@ int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, struct nls_table * nls_
hmac_md5_update((const unsigned char *) unicode_buf,
(user_name_len+dom_name_len)*2,&ctx);
hmac_md5_final(ses->mac_signing_key,&ctx);
hmac_md5_final(ses->server->mac_signing_key,&ctx);
kfree(ucase_buf);
kfree(unicode_buf);
return 0;
@ -200,7 +200,7 @@ void CalcNTLMv2_response(const struct cifsSesInfo * ses,char * v2_session_respon
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->mac_signing_key, 16, &context);
hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context);
hmac_md5_update(ses->server->cryptKey,8,&context);
/* hmac_md5_update(v2_session_response+16)client thing,8,&context); */ /* BB fix */

11
fs/cifs/cifsglob.h
View file

@ -149,6 +149,8 @@ struct TCP_Server_Info {
__u16 timeZone;
char cryptKey[CIFS_CRYPTO_KEY_SIZE];
char workstation_RFC1001_name[16]; /* 16th byte is always zero */
__u32 sequence_number; /* needed for CIFS PDU signature */
char mac_signing_key[CIFS_SESSION_KEY_SIZE + 16];
};
/*
@ -174,17 +176,16 @@ struct cifsSesInfo {
struct TCP_Server_Info *server; /* pointer to server info */
atomic_t inUse; /* # of mounts (tree connections) on this ses */
enum statusEnum status;
__u32 sequence_number; /* needed for CIFS PDU signature */
__u16 ipc_tid; /* special tid for connection to IPC share */
__u16 flags;
char mac_signing_key[CIFS_SESSION_KEY_SIZE + 16];
char *serverOS; /* name of operating system underlying the server */
char *serverNOS; /* name of network operating system that the server is running */
char *serverOS; /* name of operating system underlying server */
char *serverNOS; /* name of network operating system of server */
char *serverDomain; /* security realm of server */
int Suid; /* remote smb uid */
uid_t linux_uid; /* local Linux uid */
int capabilities;
char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for tcp names - will ipv6 and sctp addresses fit here?? */
char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
TCP names - will ipv6 and sctp addresses fit? */
char userName[MAX_USERNAME_SIZE + 1];
char domainName[MAX_USERNAME_SIZE + 1];
char * password;

2
fs/cifs/cifsproto.h
View file

@ -230,7 +230,7 @@ extern void tconInfoFree(struct cifsTconInfo *);
extern int cifs_reconnect(struct TCP_Server_Info *server);
extern int cifs_sign_smb(struct smb_hdr *, struct cifsSesInfo *,__u32 *);
extern int cifs_sign_smb(struct smb_hdr *, struct TCP_Server_Info *,__u32 *);
extern int cifs_verify_signature(struct smb_hdr *, const char * mac_key,
__u32 expected_sequence_number);
extern int cifs_calculate_mac_key(char * key,const char * rn,const char * pass);

28
fs/cifs/connect.c
View file

@ -182,7 +182,8 @@ cifs_reconnect(struct TCP_Server_Info *server)
spin_lock(&GlobalMid_Lock);
if(server->tcpStatus != CifsExiting)
server->tcpStatus = CifsGood;
spin_unlock(&GlobalMid_Lock);
server->sequence_number = 0;
spin_unlock(&GlobalMid_Lock);
/* atomic_set(&server->inFlight,0);*/
wake_up(&server->response_q);
}
@ -1352,6 +1353,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
} else
rc = 0;
memcpy(srvTcp->workstation_RFC1001_name, volume_info.source_rfc1001_name,16);
srvTcp->sequence_number = 0;
}
}
@ -2959,6 +2961,7 @@ int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
int rc = 0;
char ntlm_session_key[CIFS_SESSION_KEY_SIZE];
int ntlmv2_flag = FALSE;
int first_time = 0;
/* what if server changes its buffer size after dropping the session? */
if(pSesInfo->server->maxBuf == 0) /* no need to send on reconnect */ {
@ -2977,12 +2980,13 @@ int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
spin_unlock(&GlobalMid_Lock);
}
first_time = 1;
}
if (!rc) {
pSesInfo->capabilities = pSesInfo->server->capabilities;
if(linuxExtEnabled == 0)
pSesInfo->capabilities &= (~CAP_UNIX);
pSesInfo->sequence_number = 0;
/* pSesInfo->sequence_number = 0;*/
cFYI(1,("Security Mode: 0x%x Capabilities: 0x%x Time Zone: %d",
pSesInfo->server->secMode,
pSesInfo->server->capabilities,
@ -3015,7 +3019,10 @@ int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
v2_response = kmalloc(16 + 64 /* blob */, GFP_KERNEL);
if(v2_response) {
CalcNTLMv2_response(pSesInfo,v2_response);
/* cifs_calculate_ntlmv2_mac_key(pSesInfo->mac_signing_key, response, ntlm_session_key, */
/* if(first_time)
cifs_calculate_ntlmv2_mac_key(
pSesInfo->server->mac_signing_key,
response, ntlm_session_key, */
kfree(v2_response);
/* BB Put dummy sig in SessSetup PDU? */
} else {
@ -3028,9 +3035,11 @@ int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
pSesInfo->server->cryptKey,
ntlm_session_key);
cifs_calculate_mac_key(pSesInfo->mac_signing_key,
ntlm_session_key,
pSesInfo->password);
if(first_time)
cifs_calculate_mac_key(
pSesInfo->server->mac_signing_key,
ntlm_session_key,
pSesInfo->password);
}
/* for better security the weaker lanman hash not sent
in AuthSessSetup so we no longer calculate it */
@ -3046,8 +3055,11 @@ int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
pSesInfo->server->cryptKey,
ntlm_session_key);
cifs_calculate_mac_key(pSesInfo->mac_signing_key,
ntlm_session_key, pSesInfo->password);
if(first_time)
cifs_calculate_mac_key(
pSesInfo->server->mac_signing_key,
ntlm_session_key, pSesInfo->password);
rc = CIFSSessSetup(xid, pSesInfo,
ntlm_session_key, nls_info);
}

22
fs/cifs/transport.c
View file

@ -346,7 +346,7 @@ CIFSSendRcv(const unsigned int xid, struct cifsSesInfo *ses,
}
/* BB can we sign efficiently in this path? */
rc = cifs_sign_smb(in_buf, ses, &midQ->sequence_number);
rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
midQ->midState = MID_REQUEST_SUBMITTED;
/* rc = smb_sendv(ses->server->ssocket, in_buf, in_buf->smb_buf_length, piovec,
@ -475,7 +475,7 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
return -EIO;
}
rc = cifs_sign_smb(in_buf, ses, &midQ->sequence_number);
rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
midQ->midState = MID_REQUEST_SUBMITTED;
rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
@ -559,8 +559,7 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
}
if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
cERROR(1,
("Frame too large received. Length: %d Xid: %d",
cERROR(1, ("Frame too large received. Length: %d Xid: %d",
receive_len, xid));
rc = -EIO;
} else { /* rcvd frame is ok */
@ -575,15 +574,20 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
dump_smb(out_buf, 92);
/* convert the length into a more usable form */
if((receive_len > 24) &&
(ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))) {
rc = cifs_verify_signature(out_buf, ses->mac_signing_key,midQ->sequence_number); /* BB fix BB */
if(rc)
cFYI(1,("Unexpected signature received from server"));
(ses->server->secMode & (SECMODE_SIGN_REQUIRED |
SECMODE_SIGN_ENABLED))) {
rc = cifs_verify_signature(out_buf,
ses->server->mac_signing_key,
midQ->sequence_number+1);
if(rc) {
cERROR(1,("Unexpected packet signature received from server"));
/* BB FIXME - add code to kill session here */
}
}
*pbytes_returned = out_buf->smb_buf_length;
/* BB special case reconnect tid and reconnect uid here? */
/* BB special case reconnect tid and uid here? */
rc = map_smb_to_linux_error(out_buf);
/* convert ByteCount if necessary */