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-rw-r--r--fs/cifs/cifsglob.h5
-rw-r--r--fs/cifs/cifsproto.h2
-rw-r--r--fs/cifs/smb2pdu.c14
-rw-r--r--fs/cifs/smb2transport.c70
4 files changed, 67 insertions, 24 deletions
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 20c7f8f4fba8..92798f74f0c3 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -366,8 +366,7 @@ struct smb_version_operations {
void (*set_lease_key)(struct inode *, struct cifs_fid *fid);
/* generate new lease key */
void (*new_lease_key)(struct cifs_fid *fid);
- /* The next two functions will need to be changed to per smb session */
- void (*generate_signingkey)(struct TCP_Server_Info *server);
+ int (*generate_signingkey)(struct cifs_ses *);
int (*calc_signature)(struct smb_rqst *rqst,
struct TCP_Server_Info *server);
int (*query_mf_symlink)(const unsigned char *path, char *pbuf,
@@ -548,7 +547,6 @@ struct TCP_Server_Info {
int timeAdj; /* Adjust for difference in server time zone in sec */
__u64 CurrentMid; /* multiplex id - rotating counter */
char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
- char smb3signingkey[SMB3_SIGN_KEY_SIZE]; /* for signing smb3 packets */
/* 16th byte of RFC1001 workstation name is always null */
char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
__u32 sequence_number; /* for signing, protected by srv_mutex */
@@ -731,6 +729,7 @@ struct cifs_ses {
bool need_reconnect:1; /* connection reset, uid now invalid */
#ifdef CONFIG_CIFS_SMB2
__u16 session_flags;
+ char smb3signingkey[SMB3_SIGN_KEY_SIZE]; /* for signing smb3 packets */
#endif /* CONFIG_CIFS_SMB2 */
};
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 5b05eb082a41..b5ec2a268f56 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -431,7 +431,7 @@ extern int setup_ntlm_response(struct cifs_ses *, const struct nls_table *);
extern int setup_ntlmv2_rsp(struct cifs_ses *, const struct nls_table *);
extern void cifs_crypto_shash_release(struct TCP_Server_Info *);
extern int calc_seckey(struct cifs_ses *);
-extern void generate_smb3signingkey(struct TCP_Server_Info *);
+extern int generate_smb3signingkey(struct cifs_ses *);
#ifdef CONFIG_CIFS_WEAK_PW_HASH
extern int calc_lanman_hash(const char *password, const char *cryptkey,
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 3d010766f267..0a9458282717 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -639,11 +639,20 @@ ssetup_exit:
if (!rc) {
mutex_lock(&server->srv_mutex);
+ if (server->sign && server->ops->generate_signingkey) {
+ rc = server->ops->generate_signingkey(ses);
+ kfree(ses->auth_key.response);
+ ses->auth_key.response = NULL;
+ if (rc) {
+ cifs_dbg(FYI,
+ "SMB3 session key generation failed\n");
+ mutex_unlock(&server->srv_mutex);
+ goto keygen_exit;
+ }
+ }
if (!server->session_estab) {
server->sequence_number = 0x2;
server->session_estab = true;
- if (server->ops->generate_signingkey)
- server->ops->generate_signingkey(server);
}
mutex_unlock(&server->srv_mutex);
@@ -654,6 +663,7 @@ ssetup_exit:
spin_unlock(&GlobalMid_Lock);
}
+keygen_exit:
if (!server->sign) {
kfree(ses->auth_key.response);
ses->auth_key.response = NULL;
diff --git a/fs/cifs/smb2transport.c b/fs/cifs/smb2transport.c
index 4f2300d020c7..340abca3aa52 100644
--- a/fs/cifs/smb2transport.c
+++ b/fs/cifs/smb2transport.c
@@ -114,6 +114,23 @@ smb3_crypto_shash_allocate(struct TCP_Server_Info *server)
return 0;
}
+static struct cifs_ses *
+smb2_find_smb_ses(struct smb2_hdr *smb2hdr, struct TCP_Server_Info *server)
+{
+ struct cifs_ses *ses;
+
+ spin_lock(&cifs_tcp_ses_lock);
+ list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
+ if (ses->Suid != smb2hdr->SessionId)
+ continue;
+ spin_unlock(&cifs_tcp_ses_lock);
+ return ses;
+ }
+ spin_unlock(&cifs_tcp_ses_lock);
+
+ return NULL;
+}
+
int
smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
@@ -124,6 +141,13 @@ smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
struct kvec *iov = rqst->rq_iov;
int n_vec = rqst->rq_nvec;
struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)iov[0].iov_base;
+ struct cifs_ses *ses;
+
+ ses = smb2_find_smb_ses(smb2_pdu, server);
+ if (!ses) {
+ cifs_dbg(VFS, "%s: Could not find session\n", __func__);
+ return 0;
+ }
memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE);
memset(smb2_pdu->Signature, 0x0, SMB2_SIGNATURE_SIZE);
@@ -135,7 +159,7 @@ smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
}
rc = crypto_shash_setkey(server->secmech.hmacsha256,
- server->session_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
+ ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
if (rc) {
cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
return rc;
@@ -198,8 +222,8 @@ smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
return rc;
}
-void
-generate_smb3signingkey(struct TCP_Server_Info *server)
+int
+generate_smb3signingkey(struct cifs_ses *ses)
{
unsigned char zero = 0x0;
__u8 i[4] = {0, 0, 0, 1};
@@ -209,90 +233,99 @@ generate_smb3signingkey(struct TCP_Server_Info *server)
unsigned char *hashptr = prfhash;
memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
- memset(server->smb3signingkey, 0x0, SMB3_SIGNKEY_SIZE);
+ memset(ses->smb3signingkey, 0x0, SMB3_SIGNKEY_SIZE);
- rc = smb3_crypto_shash_allocate(server);
+ rc = smb3_crypto_shash_allocate(ses->server);
if (rc) {
cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
goto smb3signkey_ret;
}
- rc = crypto_shash_setkey(server->secmech.hmacsha256,
- server->session_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
+ rc = crypto_shash_setkey(ses->server->secmech.hmacsha256,
+ ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
if (rc) {
cifs_dbg(VFS, "%s: Could not set with session key\n", __func__);
goto smb3signkey_ret;
}
- rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash);
+ rc = crypto_shash_init(&ses->server->secmech.sdeschmacsha256->shash);
if (rc) {
cifs_dbg(VFS, "%s: Could not init sign hmac\n", __func__);
goto smb3signkey_ret;
}
- rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
+ rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
i, 4);
if (rc) {
cifs_dbg(VFS, "%s: Could not update with n\n", __func__);
goto smb3signkey_ret;
}
- rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
+ rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
"SMB2AESCMAC", 12);
if (rc) {
cifs_dbg(VFS, "%s: Could not update with label\n", __func__);
goto smb3signkey_ret;
}
- rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
+ rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
&zero, 1);
if (rc) {
cifs_dbg(VFS, "%s: Could not update with zero\n", __func__);
goto smb3signkey_ret;
}
- rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
+ rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
"SmbSign", 8);
if (rc) {
cifs_dbg(VFS, "%s: Could not update with context\n", __func__);
goto smb3signkey_ret;
}
- rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
+ rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
L, 4);
if (rc) {
cifs_dbg(VFS, "%s: Could not update with L\n", __func__);
goto smb3signkey_ret;
}
- rc = crypto_shash_final(&server->secmech.sdeschmacsha256->shash,
+ rc = crypto_shash_final(&ses->server->secmech.sdeschmacsha256->shash,
hashptr);
if (rc) {
cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__);
goto smb3signkey_ret;
}
- memcpy(server->smb3signingkey, hashptr, SMB3_SIGNKEY_SIZE);
+ memcpy(ses->smb3signingkey, hashptr, SMB3_SIGNKEY_SIZE);
smb3signkey_ret:
- return;
+ return rc;
}
int
smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
{
- int i, rc;
+ int i;
+ int rc = 0;
unsigned char smb3_signature[SMB2_CMACAES_SIZE];
unsigned char *sigptr = smb3_signature;
struct kvec *iov = rqst->rq_iov;
int n_vec = rqst->rq_nvec;
struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)iov[0].iov_base;
+ struct cifs_ses *ses;
+
+ ses = smb2_find_smb_ses(smb2_pdu, server);
+ if (!ses) {
+ cifs_dbg(VFS, "%s: Could not find session\n", __func__);
+ return 0;
+ }
memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE);
memset(smb2_pdu->Signature, 0x0, SMB2_SIGNATURE_SIZE);
rc = crypto_shash_setkey(server->secmech.cmacaes,
- server->smb3signingkey, SMB2_CMACAES_SIZE);
+ ses->smb3signingkey, SMB2_CMACAES_SIZE);
+
if (rc) {
cifs_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__);
return rc;
@@ -389,6 +422,7 @@ smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
if ((smb2_pdu->Command == SMB2_NEGOTIATE) ||
+ (smb2_pdu->Command == SMB2_SESSION_SETUP) ||
(smb2_pdu->Command == SMB2_OPLOCK_BREAK) ||
(!server->session_estab))
return 0;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.