@@ -2,6 +2,9 @@ config CIFS
tristate "CIFS support (advanced network filesystem, SMBFS successor)"
depends on INET
select NLS
+ select CRYPTO
+ 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
@@ -470,3 +470,74 @@ void CalcNTLMv2_response(const struct cifsSesInfo *ses,
hmac_md5_final(v2_session_response, &context);
/* cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); */
}
+
+void
+cifs_crypto_shash_release(struct TCP_Server_Info *server)
+{
+ if (server->secmech.md5)
+ crypto_free_shash(server->secmech.md5);
+
+ if (server->secmech.hmacmd5)
+ crypto_free_shash(server->secmech.hmacmd5);
+
+ kfree(server->secmech.sdeschmacmd5);
+
+ kfree(server->secmech.sdescmd5);
+}
+
+int
+cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
+{
+ int rc;
+ unsigned int size;
+
+ server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
+ if (!server->secmech.hmacmd5 ||
+ IS_ERR(server->secmech.hmacmd5)) {
+ cERROR(1, "could not allocate crypto hmacmd5\n");
+ return PTR_ERR(server->secmech.hmacmd5);
+ }
+
+ server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
+ if (!server->secmech.md5 || IS_ERR(server->secmech.md5)) {
+ cERROR(1, "could not allocate crypto md5\n");
+ rc = PTR_ERR(server->secmech.md5);
+ goto crypto_allocate_md5_fail;
+ }
+
+ size = sizeof(struct shash_desc) +
+ crypto_shash_descsize(server->secmech.hmacmd5);
+ server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
+ if (!server->secmech.sdeschmacmd5) {
+ cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5\n");
+ rc = -ENOMEM;
+ goto crypto_allocate_hmacmd5_sdesc_fail;
+ }
+ server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
+ server->secmech.sdeschmacmd5->shash.flags = 0x0;
+
+
+ size = sizeof(struct shash_desc) +
+ crypto_shash_descsize(server->secmech.md5);
+ server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
+ if (!server->secmech.sdescmd5) {
+ cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5\n");
+ rc = -ENOMEM;
+ goto crypto_allocate_md5_sdesc_fail;
+ }
+ server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
+ server->secmech.sdescmd5->shash.flags = 0x0;
+
+ return 0;
+
+crypto_allocate_md5_sdesc_fail:
+ kfree(server->secmech.sdeschmacmd5);
+
+crypto_allocate_hmacmd5_sdesc_fail:
+ crypto_free_shash(server->secmech.md5);
+
+crypto_allocate_md5_fail:
+ crypto_free_shash(server->secmech.hmacmd5);
+
+ return rc;
+}
@@ -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
*/
@@ -109,6 +112,20 @@ struct session_key {
} data;
};
+/* crypto security descriptor definition */
+struct sdesc {
+ struct shash_desc shash;
+ char ctx[];
+};
+
+/* crypto hashing related structure/fields, not speicific to a sec mech */
+struct cifs_secmech {
+ struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
+ struct crypto_shash *md5; /* md5 hash function */
+ struct sdesc *sdeschmacmd5; /* ctxt to generate ntlmv2 hash, CR1 */
+ struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
+};
+
struct cifs_cred {
int uid;
int gid;
@@ -187,6 +204,7 @@ struct TCP_Server_Info {
unsigned long lstrp; /* when we got last response from this server */
u16 dialect; /* dialect index that server chose */
/* extended security flavors that server supports */
+ struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
bool sec_kerberos; /* supports plain Kerberos */
bool sec_mskerberos; /* supports legacy MS Kerberos */
bool sec_kerberosu2u; /* supports U2U Kerberos */
@@ -369,6 +369,8 @@ extern int cifs_calculate_session_key(struct session_key *key, const char *rn,
extern void CalcNTLMv2_response(const 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 *);
#ifdef CONFIG_CIFS_WEAK_PW_HASH
extern void calc_lanman_hash(const char *password, const char *cryptkey,
bool encrypt, char *lnm_session_key);
@@ -1502,6 +1502,7 @@ cifs_put_tcp_session(struct TCP_Server_Info *server)
server->tcpStatus = CifsExiting;
spin_unlock(&GlobalMid_Lock);
+ cifs_crypto_shash_release(server);
cifs_fscache_release_client_cookie(server);
task = xchg(&server->tsk, NULL);
@@ -1556,10 +1557,16 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
goto out_err;
}
+ rc = cifs_crypto_shash_allocate(tcp_ses);
+ if (rc) {
+ cERROR(1, "could not setup hash structures rc %d", rc);
+ goto out_err;
+ }
+
tcp_ses->hostname = extract_hostname(volume_info->UNC);
if (IS_ERR(tcp_ses->hostname)) {
rc = PTR_ERR(tcp_ses->hostname);
- goto out_err;
+ goto out_err2;
}
tcp_ses->noblocksnd = volume_info->noblocksnd;
@@ -1600,7 +1607,7 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
}
if (rc < 0) {
cERROR(1, "Error connecting to socket. Aborting operation");
- goto out_err;
+ goto out_err2;
}
/*
@@ -1614,7 +1621,7 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
rc = PTR_ERR(tcp_ses->tsk);
cERROR(1, "error %d create cifsd thread", rc);
module_put(THIS_MODULE);
- goto out_err;
+ goto out_err2;
}
/* thread spawned, put it on the list */
@@ -1626,6 +1633,9 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
return tcp_ses;
+out_err2:
+ cifs_crypto_shash_release(tcp_ses);
+
out_err:
if (tcp_ses) {
if (!IS_ERR(tcp_ses->hostname))