struct {
uint64_t session_id;
uint16_t session_flags;
+ DATA_BLOB application_key;
DATA_BLOB signing_key;
- DATA_BLOB session_key;
bool should_sign;
- bool channel_setup;
+ DATA_BLOB channel_signing_key;
} smb2;
};
uint16_t charge;
uint16_t credits;
uint64_t mid;
- bool should_sign = false;
+ const DATA_BLOB *signing_key = NULL;
if (!tevent_req_is_in_progress(reqs[i])) {
return NT_STATUS_INTERNAL_ERROR;
nbt_len += reqlen;
if (state->session) {
- should_sign = state->session->smb2.should_sign;
- if (state->session->smb2.channel_setup) {
+ bool should_sign = state->session->smb2.should_sign;
+
+ if (opcode == SMB2_OP_SESSSETUP &&
+ state->session->smb2.signing_key.length != 0) {
should_sign = true;
}
+
+ /*
+ * We prefer the channel signing key if it is
+ * already there.
+ */
+ if (should_sign) {
+ signing_key = &state->session->smb2.channel_signing_key;
+ }
+
+ /*
+ * If it is a channel binding, we already have the main
+ * signing key and try that one.
+ */
+ if (signing_key && signing_key->length == 0) {
+ signing_key = &state->session->smb2.signing_key;
+ }
+
+ /*
+ * If we do not have any session key yet, we skip the
+ * signing of SMB2_OP_SESSSETUP requests.
+ */
+ if (signing_key && signing_key->length == 0) {
+ signing_key = NULL;
+ }
}
- if (should_sign) {
+ if (signing_key) {
NTSTATUS status;
- status = smb2_signing_sign_pdu(state->session->smb2.signing_key,
+ status = smb2_signing_sign_pdu(*signing_key,
+ state->session->conn->protocol,
&iov[hdr_iov], num_iov - hdr_iov);
if (!NT_STATUS_IS_OK(status)) {
return status;
if (session) {
should_sign = session->smb2.should_sign;
- if (session->smb2.channel_setup) {
+ if (opcode == SMB2_OP_SESSSETUP &&
+ session->smb2.signing_key.length != 0) {
should_sign = true;
}
}
}
last_session = session;
- signing_key = &session->smb2.signing_key;
+ signing_key = &session->smb2.channel_signing_key;
}
- if ((opcode == SMB2_OP_SESSSETUP) &&
- NT_STATUS_IS_OK(status)) {
+ if (opcode == SMB2_OP_SESSSETUP) {
/*
- * the caller has to check the signing
- * as only the caller knows the correct
- * session key
+ * We prefer the channel signing key, if it is
+ * already there.
+ *
+ * If we do not have a channel signing key yet,
+ * we try the main signing key, if it is not
+ * the final response.
*/
- signing_key = NULL;
+ if (signing_key && signing_key->length == 0 &&
+ !NT_STATUS_IS_OK(status)) {
+ signing_key = &session->smb2.signing_key;
+ }
+
+ if (signing_key && signing_key->length == 0) {
+ /*
+ * If we do not have a session key to
+ * verify the signature, we defer the
+ * signing check to the caller.
+ *
+ * The caller gets NT_STATUS_OK, it
+ * has to call
+ * smb2cli_session_set_session_key()
+ * or
+ * smb2cli_session_set_channel_key()
+ * which will check the signature
+ * with the channel signing key.
+ */
+ signing_key = NULL;
+ }
}
if (NT_STATUS_EQUAL(status, NT_STATUS_USER_SESSION_DELETED)) {
* propagate the NT_STATUS_USER_SESSION_DELETED
* status to the caller.
*/
- if (signing_key) {
- signing_key = NULL;
- }
+ signing_key = NULL;
}
if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_NAME_DELETED) ||
}
if (signing_key) {
- status = smb2_signing_check_pdu(*signing_key, cur, 3);
+ status = smb2_signing_check_pdu(*signing_key,
+ state->conn->protocol,
+ cur, 3);
if (!NT_STATUS_IS_OK(status)) {
/*
* If the signing check fails, we disconnect
return session->smb2.session_id;
}
+NTSTATUS smb2cli_session_application_key(struct smbXcli_session *session,
+ TALLOC_CTX *mem_ctx,
+ DATA_BLOB *key)
+{
+ *key = data_blob_null;
+
+ if (session->smb2.application_key.length == 0) {
+ return NT_STATUS_NO_USER_SESSION_KEY;
+ }
+
+ *key = data_blob_dup_talloc(mem_ctx, session->smb2.application_key);
+ if (key->data == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ return NT_STATUS_OK;
+}
+
void smb2cli_session_set_id_and_flags(struct smbXcli_session *session,
uint64_t session_id,
uint16_t session_flags)
session->smb2.session_flags = session_flags;
}
-NTSTATUS smb2cli_session_update_session_key(struct smbXcli_session *session,
- const DATA_BLOB session_key,
- const struct iovec *recv_iov)
+NTSTATUS smb2cli_session_set_session_key(struct smbXcli_session *session,
+ const DATA_BLOB _session_key,
+ const struct iovec *recv_iov)
{
struct smbXcli_conn *conn = session->conn;
uint16_t no_sign_flags;
- DATA_BLOB signing_key;
+ uint8_t session_key[16];
NTSTATUS status;
if (conn == NULL) {
return NT_STATUS_INVALID_PARAMETER_MIX;
}
+ if (session->smb2.signing_key.length != 0) {
+ return NT_STATUS_INVALID_PARAMETER_MIX;
+ }
+
no_sign_flags = SMB2_SESSION_FLAG_IS_GUEST | SMB2_SESSION_FLAG_IS_NULL;
if (session->smb2.session_flags & no_sign_flags) {
return NT_STATUS_OK;
}
- if (session->smb2.signing_key.length > 0) {
- signing_key = session->smb2.signing_key;
- } else {
- signing_key = session_key;
- }
- if (session->smb2.channel_setup) {
- signing_key = session_key;
- }
+ ZERO_STRUCT(session_key);
+ memcpy(session_key, _session_key.data,
+ MIN(_session_key.length, sizeof(session_key)));
- status = smb2_signing_check_pdu(signing_key, recv_iov, 3);
- if (!NT_STATUS_IS_OK(status)) {
- return status;
+ session->smb2.signing_key = data_blob_talloc(session,
+ session_key,
+ sizeof(session_key));
+ if (session->smb2.signing_key.data == NULL) {
+ ZERO_STRUCT(session_key);
+ return NT_STATUS_NO_MEMORY;
}
- if (!session->smb2.channel_setup) {
- session->smb2.session_key = data_blob_dup_talloc(session,
- session_key);
- if (session->smb2.session_key.data == NULL) {
- return NT_STATUS_NO_MEMORY;
- }
+ if (conn->protocol >= PROTOCOL_SMB2_24) {
+#define _STRING_BLOB(x) data_blob_const((const uint8_t *)(x), sizeof(x))
+ const DATA_BLOB label = _STRING_BLOB("SMB2AESCMAC");
+ const DATA_BLOB context = _STRING_BLOB("SmbSign");
+#undef _STRING_BLOB
+
+ smb2_key_derivation(session_key, sizeof(session_key),
+ label.data, label.length,
+ context.data, context.length,
+ session->smb2.signing_key.data);
}
- if (session->smb2.channel_setup) {
- data_blob_free(&session->smb2.signing_key);
- session->smb2.channel_setup = false;
+ session->smb2.application_key = data_blob_dup_talloc(session,
+ session->smb2.signing_key);
+ if (session->smb2.application_key.data == NULL) {
+ ZERO_STRUCT(session_key);
+ return NT_STATUS_NO_MEMORY;
}
- if (session->smb2.signing_key.length > 0) {
- return NT_STATUS_OK;
+ if (conn->protocol >= PROTOCOL_SMB2_24) {
+#define _STRING_BLOB(x) data_blob_const((const uint8_t *)(x), sizeof(x))
+ const DATA_BLOB label = _STRING_BLOB("SMB2APP");
+ const DATA_BLOB context = _STRING_BLOB("SmbRpc");
+#undef _STRING_BLOB
+
+ smb2_key_derivation(session_key, sizeof(session_key),
+ label.data, label.length,
+ context.data, context.length,
+ session->smb2.application_key.data);
}
+ ZERO_STRUCT(session_key);
- session->smb2.signing_key = data_blob_dup_talloc(session, signing_key);
- if (session->smb2.signing_key.data == NULL) {
+ session->smb2.channel_signing_key = data_blob_dup_talloc(session,
+ session->smb2.signing_key);
+ if (session->smb2.channel_signing_key.data == NULL) {
return NT_STATUS_NO_MEMORY;
}
+ status = smb2_signing_check_pdu(session->smb2.channel_signing_key,
+ session->conn->protocol,
+ recv_iov, 3);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
session->smb2.should_sign = false;
if (conn->desire_signing) {
struct smbXcli_session **_session2)
{
struct smbXcli_session *session2;
- uint16_t no_sign_flags;
-
- no_sign_flags = SMB2_SESSION_FLAG_IS_GUEST | SMB2_SESSION_FLAG_IS_NULL;
-
- if (session1->smb2.session_flags & no_sign_flags) {
- return NT_STATUS_INVALID_PARAMETER_MIX;
- }
-
- if (session1->smb2.session_key.length == 0) {
- return NT_STATUS_INVALID_PARAMETER_MIX;
- }
if (session1->smb2.signing_key.length == 0) {
return NT_STATUS_INVALID_PARAMETER_MIX;
session2->smb2.session_id = session1->smb2.session_id;
session2->smb2.session_flags = session1->smb2.session_flags;
- session2->smb2.session_key = data_blob_dup_talloc(session2,
- session1->smb2.session_key);
- if (session2->smb2.session_key.data == NULL) {
- return NT_STATUS_NO_MEMORY;
- }
-
session2->smb2.signing_key = data_blob_dup_talloc(session2,
session1->smb2.signing_key);
if (session2->smb2.signing_key.data == NULL) {
}
session2->smb2.should_sign = session1->smb2.should_sign;
- session2->smb2.channel_setup = true;
talloc_set_destructor(session2, smbXcli_session_destructor);
DLIST_ADD_END(conn->sessions, session2, struct smbXcli_session *);
*_session2 = session2;
return NT_STATUS_OK;
}
+
+NTSTATUS smb2cli_session_set_channel_key(struct smbXcli_session *session,
+ const DATA_BLOB _channel_key,
+ const struct iovec *recv_iov)
+{
+ struct smbXcli_conn *conn = session->conn;
+ uint8_t channel_key[16];
+ NTSTATUS status;
+
+ if (conn == NULL) {
+ return NT_STATUS_INVALID_PARAMETER_MIX;
+ }
+
+ if (session->smb2.channel_signing_key.length != 0) {
+ return NT_STATUS_INVALID_PARAMETER_MIX;
+ }
+
+ ZERO_STRUCT(channel_key);
+ memcpy(channel_key, _channel_key.data,
+ MIN(_channel_key.length, sizeof(channel_key)));
+
+ session->smb2.channel_signing_key = data_blob_talloc(session,
+ channel_key,
+ sizeof(channel_key));
+ if (session->smb2.channel_signing_key.data == NULL) {
+ ZERO_STRUCT(channel_key);
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ if (conn->protocol >= PROTOCOL_SMB2_24) {
+#define _STRING_BLOB(x) data_blob_const((const uint8_t *)(x), sizeof(x))
+ const DATA_BLOB label = _STRING_BLOB("SMB2AESCMAC");
+ const DATA_BLOB context = _STRING_BLOB("SmbSign");
+#undef _STRING_BLOB
+
+ smb2_key_derivation(channel_key, sizeof(channel_key),
+ label.data, label.length,
+ context.data, context.length,
+ session->smb2.channel_signing_key.data);
+ }
+ ZERO_STRUCT(channel_key);
+
+ status = smb2_signing_check_pdu(session->smb2.channel_signing_key,
+ session->conn->protocol,
+ recv_iov, 3);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ return NT_STATUS_OK;
+}
git.samba.org / ira / wip.git / blobdiff