[CIFS] Fix ntlmv2 auth with ntlmssp
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>
diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
index 847628d..051d000 100644
--- a/fs/cifs/cifsencrypt.c
+++ b/fs/cifs/cifsencrypt.c
@@ -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 @@
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;
- cifs_MD5_final(signature, &context);
+ 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);
+
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 @@
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 @@
}
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 @@
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 @@
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_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 @@
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 @@
}
/* 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 @@
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 @@
{
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 @@
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 @@
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;
}