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[CIFS] Fix ntlmv2 auth with ntlmssp

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Make ntlmv2 as an authentication mechanism within ntlmssp
instead of ntlmv1.
Parse type 2 response in ntlmssp negotiation to pluck
AV pairs and use them to calculate ntlmv2 response token.
Also, assign domain name from the sever response in type 2
packet of ntlmssp and use that (netbios) domain name in
calculation of response.

Enable cifs/smb signing using rc4 and md5.

Changed name of the structure mac_key to session_key to reflect
the type of key it holds.

Use kernel crypto_shash_* APIs instead of the equivalent cifs functions.

Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French 2010-08-20 20:42:26 +00:00
parent bf4f121138
commit 9fbc590860
11 changed files with 452 additions and 172 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/cifs/Kconfig
View File

@ -2,6 +2,8 @@ config CIFS
tristate "CIFS support (advanced network filesystem, SMBFS successor)"
depends on INET
select NLS
select CRYPTO_MD5
select CRYPTO_ARC4
help
This is the client VFS module for the Common Internet File System
(CIFS) protocol which is the successor to the Server Message Block

6
fs/cifs/asn1.c
View File

@ -597,13 +597,13 @@ decode_negTokenInit(unsigned char *security_blob, int length,
if (compare_oid(oid, oidlen, MSKRB5_OID,
MSKRB5_OID_LEN))
server->sec_mskerberos = true;
else if (compare_oid(oid, oidlen, KRB5U2U_OID,
if (compare_oid(oid, oidlen, KRB5U2U_OID,
KRB5U2U_OID_LEN))
server->sec_kerberosu2u = true;
else if (compare_oid(oid, oidlen, KRB5_OID,
if (compare_oid(oid, oidlen, KRB5_OID,
KRB5_OID_LEN))
server->sec_kerberos = true;
else if (compare_oid(oid, oidlen, NTLMSSP_OID,
if (compare_oid(oid, oidlen, NTLMSSP_OID,
NTLMSSP_OID_LEN))
server->sec_ntlmssp = true;

416
fs/cifs/cifsencrypt.c
View File

@ -27,6 +27,7 @@
#include "md5.h"
#include "cifs_unicode.h"
#include "cifsproto.h"
#include "ntlmssp.h"
#include <linux/ctype.h>
#include <linux/random.h>
@ -42,21 +43,44 @@ 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 TCP_Server_Info *server, char *signature)
{
struct MD5Context context;
int rc = 0;
struct {
struct shash_desc shash;
char ctx[crypto_shash_descsize(server->ntlmssp.md5)];
} sdesc;
if ((cifs_pdu == NULL) || (signature == NULL) || (key == NULL))
if (cifs_pdu == NULL || server == NULL || signature == NULL)
return -EINVAL;
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);
sdesc.shash.tfm = server->ntlmssp.md5;
sdesc.shash.flags = 0x0;
rc = crypto_shash_init(&sdesc.shash);
if (rc) {
cERROR(1, "could not initialize master crypto API hmacmd5\n");
return rc;
}
if (server->secType == RawNTLMSSP)
crypto_shash_update(&sdesc.shash,
server->session_key.data.ntlmv2.key,
CIFS_NTLMV2_SESSKEY_SIZE);
else
crypto_shash_update(&sdesc.shash,
(char *)&server->session_key.data,
server->session_key.len);
crypto_shash_update(&sdesc.shash,
cifs_pdu->Protocol, cifs_pdu->smb_buf_length);
rc = crypto_shash_final(&sdesc.shash, signature);
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)
{
@ -78,8 +102,7 @@ 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,
smb_signature);
rc = cifs_calculate_signature(cifs_pdu, server, smb_signature);
if (rc)
memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
else
@ -89,16 +112,36 @@ 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 struct mac_key *key, char *signature)
struct TCP_Server_Info *server, char *signature)
{
struct MD5Context context;
int i;
int rc = 0;
struct {
struct shash_desc shash;
char ctx[crypto_shash_descsize(server->ntlmssp.md5)];
} sdesc;
if ((iov == NULL) || (signature == NULL) || (key == NULL))
if (iov == NULL || server == NULL || signature == NULL)
return -EINVAL;
cifs_MD5_init(&context);
cifs_MD5_update(&context, (char *)&key->data, key->len);
sdesc.shash.tfm = server->ntlmssp.md5;
sdesc.shash.flags = 0x0;
rc = crypto_shash_init(&sdesc.shash);
if (rc) {
cERROR(1, "could not initialize master crypto API hmacmd5\n");
return rc;
}
if (server->secType == RawNTLMSSP)
crypto_shash_update(&sdesc.shash,
server->session_key.data.ntlmv2.key,
CIFS_NTLMV2_SESSKEY_SIZE);
else
crypto_shash_update(&sdesc.shash,
(char *)&server->session_key.data,
server->session_key.len);
for (i = 0; i < n_vec; i++) {
if (iov[i].iov_len == 0)
continue;
@ -111,18 +154,18 @@ static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
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);
crypto_shash_update(&sdesc.shash,
iov[i].iov_base + 4, iov[i].iov_len - 4);
} else
cifs_MD5_update(&context, iov[i].iov_base, iov[i].iov_len);
crypto_shash_update(&sdesc.shash,
iov[i].iov_base, iov[i].iov_len);
}
cifs_MD5_final(signature, &context);
rc = crypto_shash_final(&sdesc.shash, signature);
return 0;
}
int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
__u32 *pexpected_response_sequence_number)
{
@ -145,8 +188,7 @@ int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
server->sequence_number++;
spin_unlock(&GlobalMid_Lock);
rc = cifs_calc_signature2(iov, n_vec, &server->mac_signing_key,
smb_signature);
rc = cifs_calc_signature2(iov, n_vec, server, smb_signature);
if (rc)
memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
else
@ -156,14 +198,14 @@ int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
}
int cifs_verify_signature(struct smb_hdr *cifs_pdu,
const struct mac_key *mac_key,
struct TCP_Server_Info *server,
__u32 expected_sequence_number)
{
unsigned int rc;
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 || server == NULL)
return -EINVAL;
if (cifs_pdu->Command == SMB_COM_NEGOTIATE)
@ -192,7 +234,7 @@ int cifs_verify_signature(struct smb_hdr *cifs_pdu,
cpu_to_le32(expected_sequence_number);
cifs_pdu->Signature.Sequence.Reserved = 0;
rc = cifs_calculate_signature(cifs_pdu, mac_key,
rc = cifs_calculate_signature(cifs_pdu, server,
what_we_think_sig_should_be);
if (rc)
@ -209,7 +251,7 @@ int cifs_verify_signature(struct smb_hdr *cifs_pdu,
}
/* We fill in key by putting in 40 byte array which was allocated by caller */
int cifs_calculate_mac_key(struct mac_key *key, const char *rn,
int cifs_calculate_session_key(struct session_key *key, const char *rn,
const char *password)
{
char temp_key[16];
@ -223,63 +265,6 @@ int cifs_calculate_mac_key(struct mac_key *key, const char *rn,
return 0;
}
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;
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)
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)
return -EINVAL;
ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL);
if (ucase_buf == NULL)
return -ENOMEM;
unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL);
if (unicode_buf == NULL) {
kfree(ucase_buf);
return -ENOMEM;
}
for (i = 0; i < user_name_len; i++)
ucase_buf[i] = nls_info->charset2upper[(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; i < dom_name_len; i++)
ucase_buf[i] = nls_info->charset2upper[(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);
hmac_md5_final(ses->server->ntlmv2_hash, &ctx);
kfree(ucase_buf);
kfree(unicode_buf);
return 0;
}
#ifdef CONFIG_CIFS_WEAK_PW_HASH
void calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
char *lnm_session_key)
@ -324,21 +309,29 @@ static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
{
int rc = 0;
int len;
char nt_hash[16];
struct HMACMD5Context *pctxt;
char nt_hash[CIFS_NTHASH_SIZE];
wchar_t *user;
wchar_t *domain;
pctxt = kmalloc(sizeof(struct HMACMD5Context), GFP_KERNEL);
if (pctxt == NULL)
return -ENOMEM;
wchar_t *server;
struct {
struct shash_desc shash;
char ctx[crypto_shash_descsize(ses->server->ntlmssp.hmacmd5)];
} sdesc;
/* 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);
sdesc.shash.tfm = ses->server->ntlmssp.hmacmd5;
sdesc.shash.flags = 0x0;
crypto_shash_setkey(ses->server->ntlmssp.hmacmd5, nt_hash,
CIFS_NTHASH_SIZE);
rc = crypto_shash_init(&sdesc.shash);
if (rc) {
cERROR(1, "could not initialize master crypto API hmacmd5\n");
return rc;
}
/* convert ses->userName to unicode and uppercase */
len = strlen(ses->userName);
@ -347,7 +340,8 @@ static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
goto calc_exit_2;
len = cifs_strtoUCS((__le16 *)user, ses->userName, len, nls_cp);
UniStrupr(user);
hmac_md5_update((char *)user, 2*len, pctxt);
crypto_shash_update(&sdesc.shash, (char *)user, 2 * len);
/* convert ses->domainName to unicode and uppercase */
if (ses->domainName) {
@ -363,65 +357,243 @@ static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
Maybe converting the domain name earlier makes sense */
/* UniStrupr(domain); */
hmac_md5_update((char *)domain, 2*len, pctxt);
crypto_shash_update(&sdesc.shash, (char *)domain, 2 * len);
kfree(domain);
} else if (ses->serverName) {
len = strlen(ses->serverName);
server = kmalloc(2 + (len * 2), GFP_KERNEL);
if (server == NULL)
goto calc_exit_1;
len = cifs_strtoUCS((__le16 *)server, ses->serverName, 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); */
crypto_shash_update(&sdesc.shash, (char *)server, 2 * len);
kfree(server);
}
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);
rc = crypto_shash_final(&sdesc.shash, ses->server->ntlmv2_hash);
kfree(pctxt);
return rc;
}
void setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf,
const struct nls_table *nls_cp)
static int
find_domain_name(struct cifsSesInfo *ses)
{
int rc = 0;
unsigned int attrsize;
unsigned int type;
unsigned char *blobptr;
struct ntlmssp2_name *attrptr;
if (ses->server->tiblob) {
blobptr = ses->server->tiblob;
attrptr = (struct ntlmssp2_name *) blobptr;
while ((type = attrptr->type) != 0) {
blobptr += 2; /* advance attr type */
attrsize = attrptr->length;
blobptr += 2; /* advance attr size */
if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
if (!ses->domainName) {
ses->domainName =
kmalloc(attrptr->length + 1,
GFP_KERNEL);
if (!ses->domainName)
return -ENOMEM;
cifs_from_ucs2(ses->domainName,
(__le16 *)blobptr,
attrptr->length,
attrptr->length,
load_nls_default(), false);
}
}
blobptr += attrsize; /* advance attr value */
attrptr = (struct ntlmssp2_name *) blobptr;
}
} else {
ses->server->tilen = 2 * sizeof(struct ntlmssp2_name);
ses->server->tiblob = kmalloc(ses->server->tilen, GFP_KERNEL);
if (!ses->server->tiblob) {
ses->server->tilen = 0;
cERROR(1, "Challenge target info allocation failure");
return -ENOMEM;
}
memset(ses->server->tiblob, 0x0, ses->server->tilen);
attrptr = (struct ntlmssp2_name *) ses->server->tiblob;
attrptr->type = cpu_to_le16(NTLMSSP_DOMAIN_TYPE);
}
return rc;
}
static int
CalcNTLMv2_response(const struct TCP_Server_Info *server,
char *v2_session_response)
{
int rc;
struct {
struct shash_desc shash;
char ctx[crypto_shash_descsize(server->ntlmssp.hmacmd5)];
} sdesc;
sdesc.shash.tfm = server->ntlmssp.hmacmd5;
sdesc.shash.flags = 0x0;
crypto_shash_setkey(server->ntlmssp.hmacmd5, server->ntlmv2_hash,
CIFS_HMAC_MD5_HASH_SIZE);
rc = crypto_shash_init(&sdesc.shash);
if (rc) {
cERROR(1, "could not initialize master crypto API hmacmd5\n");
return rc;
}
memcpy(v2_session_response + CIFS_SERVER_CHALLENGE_SIZE,
server->cryptKey, CIFS_SERVER_CHALLENGE_SIZE);
crypto_shash_update(&sdesc.shash,
v2_session_response + CIFS_SERVER_CHALLENGE_SIZE,
sizeof(struct ntlmv2_resp) - CIFS_SERVER_CHALLENGE_SIZE);
if (server->tilen)
crypto_shash_update(&sdesc.shash,
server->tiblob, server->tilen);
rc = crypto_shash_final(&sdesc.shash, v2_session_response);
return rc;
}
int
setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf,
const struct nls_table *nls_cp)
{
int rc = 0;
struct ntlmv2_resp *buf = (struct ntlmv2_resp *)resp_buf;
struct HMACMD5Context context;
struct {
struct shash_desc shash;
char ctx[crypto_shash_descsize(ses->server->ntlmssp.hmacmd5)];
} sdesc;
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;
if (!ses->domainName) {
rc = find_domain_name(ses);
if (rc) {
cERROR(1, "could not get domain/server name rc %d", rc);
return rc;
}
}
/* calculate buf->ntlmv2_hash */
rc = calc_ntlmv2_hash(ses, nls_cp);
if (rc)
if (rc) {
cERROR(1, "could not get v2 hash rc %d", rc);
CalcNTLMv2_response(ses, resp_buf);
return rc;
}
rc = CalcNTLMv2_response(ses->server, resp_buf);
if (rc) {
cERROR(1, "could not get v2 hash rc %d", rc);
return rc;
}
/* 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);
crypto_shash_setkey(ses->server->ntlmssp.hmacmd5,
ses->server->ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
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);
sdesc.shash.tfm = ses->server->ntlmssp.hmacmd5;
sdesc.shash.flags = 0x0;
rc = crypto_shash_init(&sdesc.shash);
if (rc) {
cERROR(1, "could not initialize master crypto API hmacmd5\n");
return rc;
}
crypto_shash_update(&sdesc.shash, resp_buf, CIFS_HMAC_MD5_HASH_SIZE);
rc = crypto_shash_final(&sdesc.shash,
ses->server->session_key.data.ntlmv2.key);
memcpy(&ses->server->session_key.data.ntlmv2.resp, resp_buf,
sizeof(struct ntlmv2_resp));
ses->server->session_key.len = 16 + sizeof(struct ntlmv2_resp);
return rc;
}
void CalcNTLMv2_response(const struct cifsSesInfo *ses,
char *v2_session_response)
int
calc_seckey(struct TCP_Server_Info *server)
{
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);
int rc;
unsigned char sec_key[CIFS_NTLMV2_SESSKEY_SIZE];
struct crypto_blkcipher *tfm_arc4;
struct scatterlist sgin, sgout;
struct blkcipher_desc desc;
hmac_md5_update(v2_session_response+8,
sizeof(struct ntlmv2_resp) - 8, &context);
get_random_bytes(sec_key, CIFS_NTLMV2_SESSKEY_SIZE);
hmac_md5_final(v2_session_response, &context);
/* cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); */
tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)",
0, CRYPTO_ALG_ASYNC);
if (!tfm_arc4 || IS_ERR(tfm_arc4)) {
cERROR(1, "could not allocate " "master crypto API arc4\n");
return 1;
}
crypto_blkcipher_setkey(tfm_arc4,
server->session_key.data.ntlmv2.key, CIFS_CPHTXT_SIZE);
sg_init_one(&sgin, sec_key, CIFS_CPHTXT_SIZE);
sg_init_one(&sgout, server->ntlmssp.ciphertext, CIFS_CPHTXT_SIZE);
rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
if (!rc)
memcpy(server->session_key.data.ntlmv2.key,
sec_key, CIFS_NTLMV2_SESSKEY_SIZE);
crypto_free_blkcipher(tfm_arc4);
return 0;
}
void
cifs_crypto_shash_release(struct TCP_Server_Info *server)
{
if (server->ntlmssp.md5)
crypto_free_shash(server->ntlmssp.md5);
if (server->ntlmssp.hmacmd5)
crypto_free_shash(server->ntlmssp.hmacmd5);
}
int
cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
{
server->ntlmssp.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
if (!server->ntlmssp.hmacmd5 ||
IS_ERR(server->ntlmssp.hmacmd5)) {
cERROR(1, "could not allocate master crypto API hmacmd5\n");
return 1;
}
server->ntlmssp.md5 = crypto_alloc_shash("md5", 0, 0);
if (!server->ntlmssp.md5 || IS_ERR(server->ntlmssp.md5)) {
crypto_free_shash(server->ntlmssp.hmacmd5);
cERROR(1, "could not allocate master crypto API md5\n");
return 1;
}
return 0;
}

18
fs/cifs/cifsglob.h
View File

@ -25,6 +25,9 @@
#include <linux/workqueue.h>
#include "cifs_fs_sb.h"
#include "cifsacl.h"
#include <crypto/internal/hash.h>
#include <linux/scatterlist.h>
/*
* The sizes of various internal tables and strings
*/
@ -97,7 +100,7 @@ enum protocolEnum {
/* Netbios frames protocol not supported at this time */
};
struct mac_key {
struct session_key {
unsigned int len;
union {
char ntlm[CIFS_SESS_KEY_SIZE + 16];
@ -120,6 +123,14 @@ struct cifs_cred {
struct cifs_ace *aces;
};
struct ntlmssp_auth {
__u32 client_flags;
__u32 server_flags;
unsigned char ciphertext[CIFS_CPHTXT_SIZE];
struct crypto_shash *hmacmd5;
struct crypto_shash *md5;
};
/*
*****************************************************************
* Except the CIFS PDUs themselves all the
@ -182,11 +193,14 @@ struct TCP_Server_Info {
/* 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 mac_key mac_signing_key;
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 */
unsigned int tilen; /* length of the target info blob */
unsigned char *tiblob; /* target info blob in challenge response */
struct ntlmssp_auth ntlmssp; /* various keys, ciphers, flags */
bool sec_kerberos; /* supports plain Kerberos */
bool sec_mskerberos; /* supports legacy MS Kerberos */
bool sec_kerberosu2u; /* supports U2U Kerberos */

7
fs/cifs/cifspdu.h
View File

@ -134,6 +134,12 @@
* Size of the session key (crypto key encrypted with the password
*/
#define CIFS_SESS_KEY_SIZE (24)
#define CIFS_CLIENT_CHALLENGE_SIZE (8)
#define CIFS_SERVER_CHALLENGE_SIZE (8)
#define CIFS_HMAC_MD5_HASH_SIZE (16)
#define CIFS_CPHTXT_SIZE (16)
#define CIFS_NTLMV2_SESSKEY_SIZE (16)
#define CIFS_NTHASH_SIZE (16)
/*
* Maximum user name length
@ -663,7 +669,6 @@ struct ntlmv2_resp {
__le64 time;
__u64 client_chal; /* random */
__u32 reserved2;
struct ntlmssp2_name names[2];
/* array of name entries could follow ending in minimum 4 byte struct */
} __attribute__((packed));

12
fs/cifs/cifsproto.h
View File

@ -361,15 +361,15 @@ extern int cifs_sign_smb(struct smb_hdr *, struct TCP_Server_Info *, __u32 *);
extern int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *,
__u32 *);
extern int cifs_verify_signature(struct smb_hdr *,
const struct mac_key *mac_key,
struct TCP_Server_Info *server,
__u32 expected_sequence_number);
extern int cifs_calculate_mac_key(struct mac_key *key, const char *rn,
extern int cifs_calculate_session_key(struct session_key *key, const char *rn,
const char *pass);
extern int CalcNTLMv2_partial_mac_key(struct cifsSesInfo *,
const struct nls_table *);
extern void CalcNTLMv2_response(const struct cifsSesInfo *, char *);
extern void setup_ntlmv2_rsp(struct cifsSesInfo *, char *,
extern int setup_ntlmv2_rsp(struct cifsSesInfo *, char *,
const struct nls_table *);
extern int cifs_crypto_shash_allocate(struct TCP_Server_Info *);
extern void cifs_crypto_shash_release(struct TCP_Server_Info *);
extern int calc_seckey(struct TCP_Server_Info *);
#ifdef CONFIG_CIFS_WEAK_PW_HASH
extern void calc_lanman_hash(const char *password, const char *cryptkey,
bool encrypt, char *lnm_session_key);

13
fs/cifs/cifssmb.c
View File

@ -604,11 +604,14 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
else
rc = -EINVAL;
if (server->sec_kerberos || server->sec_mskerberos)
server->secType = Kerberos;
else if (server->sec_ntlmssp)
server->secType = RawNTLMSSP;
else
if (server->secType == Kerberos) {
if (!server->sec_kerberos &&
!server->sec_mskerberos)
rc = -EOPNOTSUPP;
} else if (server->secType == RawNTLMSSP) {
if (!server->sec_ntlmssp)
rc = -EOPNOTSUPP;
} else
rc = -EOPNOTSUPP;
}
} else

13
fs/cifs/connect.c
View File

@ -1707,6 +1707,7 @@ cifs_put_smb_ses(struct cifsSesInfo *ses)
CIFSSMBLogoff(xid, ses);
_FreeXid(xid);
}
cifs_crypto_shash_release(server);
sesInfoFree(ses);
cifs_put_tcp_session(server);
}
@ -1786,13 +1787,23 @@ cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
ses->linux_uid = volume_info->linux_uid;
ses->overrideSecFlg = volume_info->secFlg;
rc = cifs_crypto_shash_allocate(server);
if (rc) {
cERROR(1, "could not setup hash structures rc %d", rc);
goto get_ses_fail;
}
server->tilen = 0;
server->tiblob = NULL;
mutex_lock(&ses->session_mutex);
rc = cifs_negotiate_protocol(xid, ses);
if (!rc)
rc = cifs_setup_session(xid, ses, volume_info->local_nls);
mutex_unlock(&ses->session_mutex);
if (rc)
if (rc) {
cifs_crypto_shash_release(ses->server);
goto get_ses_fail;
}
/* success, put it on the list */
write_lock(&cifs_tcp_ses_lock);

13
fs/cifs/ntlmssp.h
View File

@ -61,6 +61,19 @@
#define NTLMSSP_NEGOTIATE_KEY_XCH 0x40000000
#define NTLMSSP_NEGOTIATE_56 0x80000000
/* Define AV Pair Field IDs */
#define NTLMSSP_AV_EOL 0
#define NTLMSSP_AV_NB_COMPUTER_NAME 1
#define NTLMSSP_AV_NB_DOMAIN_NAME 2
#define NTLMSSP_AV_DNS_COMPUTER_NAME 3
#define NTLMSSP_AV_DNS_DOMAIN_NAME 4
#define NTLMSSP_AV_DNS_TREE_NAME 5
#define NTLMSSP_AV_FLAGS 6
#define NTLMSSP_AV_TIMESTAMP 7
#define NTLMSSP_AV_RESTRICTION 8
#define NTLMSSP_AV_TARGET_NAME 9
#define NTLMSSP_AV_CHANNEL_BINDINGS 10
/* Although typedefs are not commonly used for structure definitions */
/* in the Linux kernel, in this particular case they are useful */
/* to more closely match the standards document for NTLMSSP from */

118
fs/cifs/sess.c
View File

@ -383,6 +383,9 @@ static int decode_ascii_ssetup(char **pbcc_area, int bleft,
static int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
struct cifsSesInfo *ses)
{
unsigned int tioffset; /* challeng message target info area */
unsigned int tilen; /* challeng message target info area length */
CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
@ -405,6 +408,18 @@ static int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
/* BB spec says that if AvId field of MsvAvTimestamp is populated then
we must set the MIC field of the AUTHENTICATE_MESSAGE */
tioffset = cpu_to_le16(pblob->TargetInfoArray.BufferOffset);
tilen = cpu_to_le16(pblob->TargetInfoArray.Length);
ses->server->tilen = tilen;
if (tilen) {
ses->server->tiblob = kmalloc(tilen, GFP_KERNEL);
if (!ses->server->tiblob) {
cERROR(1, "Challenge target info allocation failure");
return -ENOMEM;
}
memcpy(ses->server->tiblob, bcc_ptr + tioffset, tilen);
}
return 0;
}
@ -451,10 +466,12 @@ static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
struct cifsSesInfo *ses,
const struct nls_table *nls_cp, bool first)
{
int rc;
unsigned int size;
AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer;
__u32 flags;
unsigned char *tmp;
char ntlm_session_key[CIFS_SESS_KEY_SIZE];
struct ntlmv2_resp ntlmv2_response = {};
memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
sec_blob->MessageType = NtLmAuthenticate;
@ -477,19 +494,25 @@ static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
sec_blob->LmChallengeResponse.Length = 0;
sec_blob->LmChallengeResponse.MaximumLength = 0;
/* calculate session key, BB what about adding similar ntlmv2 path? */
SMBNTencrypt(ses->password, ses->server->cryptKey, ntlm_session_key);
if (first)
cifs_calculate_mac_key(&ses->server->mac_signing_key,
ntlm_session_key, ses->password);
memcpy(tmp, ntlm_session_key, CIFS_SESS_KEY_SIZE);
sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer);
sec_blob->NtChallengeResponse.Length = cpu_to_le16(CIFS_SESS_KEY_SIZE);
sec_blob->NtChallengeResponse.MaximumLength =
cpu_to_le16(CIFS_SESS_KEY_SIZE);
rc = setup_ntlmv2_rsp(ses, (char *)&ntlmv2_response, nls_cp);
if (rc) {
cERROR(1, "error rc: %d during ntlmssp ntlmv2 setup", rc);
goto setup_ntlmv2_ret;
}
size = sizeof(struct ntlmv2_resp);
memcpy(tmp, (char *)&ntlmv2_response, size);
tmp += size;
if (ses->server->tilen > 0) {
memcpy(tmp, ses->server->tiblob, ses->server->tilen);
tmp += ses->server->tilen;
} else
ses->server->tilen = 0;
tmp += CIFS_SESS_KEY_SIZE;
sec_blob->NtChallengeResponse.Length = cpu_to_le16(size +
ses->server->tilen);
sec_blob->NtChallengeResponse.MaximumLength =
cpu_to_le16(size + ses->server->tilen);
if (ses->domainName == NULL) {
sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
@ -501,7 +524,6 @@ static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
len = cifs_strtoUCS((__le16 *)tmp, ses->domainName,
MAX_USERNAME_SIZE, nls_cp);
len *= 2; /* unicode is 2 bytes each */
len += 2; /* trailing null */
sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
sec_blob->DomainName.Length = cpu_to_le16(len);
sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
@ -518,7 +540,6 @@ static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
len = cifs_strtoUCS((__le16 *)tmp, ses->userName,
MAX_USERNAME_SIZE, nls_cp);
len *= 2; /* unicode is 2 bytes each */
len += 2; /* trailing null */
sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
sec_blob->UserName.Length = cpu_to_le16(len);
sec_blob->UserName.MaximumLength = cpu_to_le16(len);
@ -530,9 +551,26 @@ static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
sec_blob->WorkstationName.MaximumLength = 0;
tmp += 2;
sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
sec_blob->SessionKey.Length = 0;
sec_blob->SessionKey.MaximumLength = 0;
if ((ses->server->ntlmssp.server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
!calc_seckey(ses->server)) {
memcpy(tmp, ses->server->ntlmssp.ciphertext, CIFS_CPHTXT_SIZE);
sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
sec_blob->SessionKey.MaximumLength =
cpu_to_le16(CIFS_CPHTXT_SIZE);
tmp += CIFS_CPHTXT_SIZE;
} else {
sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
sec_blob->SessionKey.Length = 0;
sec_blob->SessionKey.MaximumLength = 0;
}
ses->server->sequence_number = 0;
setup_ntlmv2_ret:
if (ses->server->tilen > 0)
kfree(ses->server->tiblob);
return tmp - pbuffer;
}
@ -546,15 +584,14 @@ static void setup_ntlmssp_neg_req(SESSION_SETUP_ANDX *pSMB,
return;
}
static int setup_ntlmssp_auth_req(SESSION_SETUP_ANDX *pSMB,
static int setup_ntlmssp_auth_req(char *ntlmsspblob,
struct cifsSesInfo *ses,
const struct nls_table *nls, bool first_time)
{
int bloblen;
bloblen = build_ntlmssp_auth_blob(&pSMB->req.SecurityBlob[0], ses, nls,
bloblen = build_ntlmssp_auth_blob(ntlmsspblob, ses, nls,
first_time);
pSMB->req.SecurityBlobLength = cpu_to_le16(bloblen);
return bloblen;
}
@ -580,6 +617,7 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses,
struct key *spnego_key = NULL;
__le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
bool first_time;
char *ntlmsspblob;
if (ses == NULL)
return -EINVAL;
@ -690,7 +728,7 @@ ssetup_ntlmssp_authenticate:
if (first_time) /* should this be moved into common code
with similar ntlmv2 path? */
cifs_calculate_mac_key(&ses->server->mac_signing_key,
cifs_calculate_session_key(&ses->server->session_key,
ntlm_session_key, ses->password);
/* copy session key */
@ -729,12 +767,21 @@ ssetup_ntlmssp_authenticate:
cpu_to_le16(sizeof(struct ntlmv2_resp));
/* calculate session key */
setup_ntlmv2_rsp(ses, v2_sess_key, nls_cp);
rc = setup_ntlmv2_rsp(ses, v2_sess_key, nls_cp);
if (rc) {
kfree(v2_sess_key);
goto ssetup_exit;
}
/* FIXME: calculate MAC key */
memcpy(bcc_ptr, (char *)v2_sess_key,
sizeof(struct ntlmv2_resp));
bcc_ptr += sizeof(struct ntlmv2_resp);
kfree(v2_sess_key);
if (ses->server->tilen > 0) {
memcpy(bcc_ptr, ses->server->tiblob,
ses->server->tilen);
bcc_ptr += ses->server->tilen;
}
if (ses->capabilities & CAP_UNICODE) {
if (iov[0].iov_len % 2) {
*bcc_ptr = 0;
@ -765,15 +812,15 @@ ssetup_ntlmssp_authenticate:
}
/* bail out if key is too long */
if (msg->sesskey_len >
sizeof(ses->server->mac_signing_key.data.krb5)) {
sizeof(ses->server->session_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->mac_signing_key.len = msg->sesskey_len;
memcpy(ses->server->mac_signing_key.data.krb5,
ses->server->session_key.len = msg->sesskey_len;
memcpy(ses->server->session_key.data.krb5,
msg->data, msg->sesskey_len);
}
pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
@ -815,12 +862,26 @@ ssetup_ntlmssp_authenticate:
if (phase == NtLmNegotiate) {
setup_ntlmssp_neg_req(pSMB, ses);
iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
iov[1].iov_base = &pSMB->req.SecurityBlob[0];
} else if (phase == NtLmAuthenticate) {
int blob_len;
blob_len = setup_ntlmssp_auth_req(pSMB, ses,
nls_cp,
first_time);
ntlmsspblob = kmalloc(5 *
sizeof(struct _AUTHENTICATE_MESSAGE),
GFP_KERNEL);
if (!ntlmsspblob) {
cERROR(1, "Can't allocate NTLMSSP");
rc = -ENOMEM;
goto ssetup_exit;
}
blob_len = setup_ntlmssp_auth_req(ntlmsspblob,
ses,
nls_cp,
first_time);
iov[1].iov_len = blob_len;
iov[1].iov_base = ntlmsspblob;
pSMB->req.SecurityBlobLength =
cpu_to_le16(blob_len);
/* Make sure that we tell the server that we
are using the uid that it just gave us back
on the response (challenge) */
@ -830,7 +891,6 @@ ssetup_ntlmssp_authenticate:
rc = -ENOSYS;
goto ssetup_exit;
}
iov[1].iov_base = &pSMB->req.SecurityBlob[0];
/* unicode strings must be word aligned */
if ((iov[0].iov_len + iov[1].iov_len) % 2) {
*bcc_ptr = 0;

6
fs/cifs/transport.c
View File

@ -543,7 +543,7 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
(ses->server->secMode & (SECMODE_SIGN_REQUIRED |
SECMODE_SIGN_ENABLED))) {
rc = cifs_verify_signature(midQ->resp_buf,
&ses->server->mac_signing_key,
ses->server,
midQ->sequence_number+1);
if (rc) {
cERROR(1, "Unexpected SMB signature");
@ -731,7 +731,7 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
(ses->server->secMode & (SECMODE_SIGN_REQUIRED |
SECMODE_SIGN_ENABLED))) {
rc = cifs_verify_signature(out_buf,
&ses->server->mac_signing_key,
ses->server,
midQ->sequence_number+1);
if (rc) {
cERROR(1, "Unexpected SMB signature");
@ -981,7 +981,7 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
(ses->server->secMode & (SECMODE_SIGN_REQUIRED |
SECMODE_SIGN_ENABLED))) {
rc = cifs_verify_signature(out_buf,
&ses->server->mac_signing_key,
ses->server,
midQ->sequence_number+1);
if (rc) {
cERROR(1, "Unexpected SMB signature");