Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 555 insertions, 0 deletions

diff --git a/auth/credentials/credentials_ntlm.c b/auth/credentials/credentials_ntlm.c
new file mode 100644
index 0000000..1c17148
--- /dev/null
+++ b/auth/credentials/credentials_ntlm.c
@@ -0,0 +1,555 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   User credentials handling
+
+   Copyright (C) Andrew Tridgell      2001
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
+   Copyright (C) Stefan Metzmacher 2005
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "librpc/gen_ndr/samr.h" /* for struct samrPassword */
+#include "../lib/crypto/crypto.h"
+#include "libcli/auth/libcli_auth.h"
+#include "auth/credentials/credentials.h"
+#include "auth/credentials/credentials_internal.h"
+
+#include "lib/crypto/gnutls_helpers.h"
+#include <gnutls/gnutls.h>
+#include <gnutls/crypto.h>
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_AUTH
+
+_PUBLIC_ NTSTATUS cli_credentials_get_ntlm_response(struct cli_credentials *cred, TALLOC_CTX *mem_ctx, 
+					   int *flags,
+					   DATA_BLOB challenge,
+					   const NTTIME *server_timestamp,
+					   DATA_BLOB target_info,
+					   DATA_BLOB *_lm_response, DATA_BLOB *_nt_response, 
+					   DATA_BLOB *_lm_session_key, DATA_BLOB *_session_key) 
+{
+	TALLOC_CTX *frame = talloc_stackframe();
+	const char *user = NULL;
+	const char *domain = NULL;
+	DATA_BLOB lm_response = data_blob_null;
+	DATA_BLOB nt_response = data_blob_null;
+	DATA_BLOB lm_session_key = data_blob_null;
+	DATA_BLOB session_key = data_blob_null;
+	const struct samr_Password *nt_hash = NULL;
+	int rc;
+
+	if (cred->kerberos_state == CRED_USE_KERBEROS_REQUIRED) {
+		TALLOC_FREE(frame);
+		return NT_STATUS_INVALID_PARAMETER_MIX;
+	}
+
+	/* We may already have an NTLM response we prepared earlier.
+	 * This is used for NTLM pass-though authentication */
+	if (cred->nt_response.data || cred->lm_response.data) {
+		if (cred->nt_response.length != 0) {
+			nt_response = data_blob_dup_talloc(frame,
+							   cred->nt_response);
+			if (nt_response.data == NULL) {
+				TALLOC_FREE(frame);
+				return NT_STATUS_NO_MEMORY;
+			}
+		}
+		if (cred->nt_session_key.length != 0) {
+			session_key = data_blob_dup_talloc(frame,
+							   cred->nt_session_key);
+			if (session_key.data == NULL) {
+				TALLOC_FREE(frame);
+				return NT_STATUS_NO_MEMORY;
+			}
+		}
+		if (cred->lm_response.length != 0) {
+			lm_response = data_blob_dup_talloc(frame,
+							   cred->lm_response);
+			if (lm_response.data == NULL) {
+				TALLOC_FREE(frame);
+				return NT_STATUS_NO_MEMORY;
+			}
+		}
+		if (cred->lm_session_key.length != 0) {
+			lm_session_key = data_blob_dup_talloc(frame,
+							      cred->lm_session_key);
+			if (lm_session_key.data == NULL) {
+				TALLOC_FREE(frame);
+				return NT_STATUS_NO_MEMORY;
+			}
+		}
+
+		if (cred->lm_response.data == NULL) {
+			*flags = *flags & ~CLI_CRED_LANMAN_AUTH;
+		}
+		goto done;
+	}
+
+	nt_hash = cli_credentials_get_nt_hash(cred, frame);
+
+	cli_credentials_get_ntlm_username_domain(cred, frame, &user, &domain);
+	if (user == NULL) {
+		TALLOC_FREE(frame);
+		return NT_STATUS_NO_MEMORY;
+	}
+	if (domain == NULL) {
+		TALLOC_FREE(frame);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	/* If we are sending a username@realm login (see function
+	 * above), then we will not send LM, it will not be
+	 * accepted */
+	if (cred->principal_obtained > cred->username_obtained) {
+		*flags = *flags & ~CLI_CRED_LANMAN_AUTH;
+	}
+
+	/* Likewise if we are a machine account (avoid protocol downgrade attacks) */
+	if (cred->machine_account) {
+		*flags = *flags & ~CLI_CRED_LANMAN_AUTH;
+	}
+
+	if (!nt_hash) {
+		/* do nothing - blobs are zero length */
+
+		/* session key is all zeros */
+		session_key = data_blob_talloc_zero(frame, 16);
+		if (session_key.data == NULL) {
+			TALLOC_FREE(frame);
+			return NT_STATUS_NO_MEMORY;
+		}
+		lm_session_key = data_blob_talloc_zero(frame, 16);
+		if (lm_session_key.data == NULL) {
+			TALLOC_FREE(frame);
+			return NT_STATUS_NO_MEMORY;
+		}
+
+		/* not doing NTLM2 without a password */
+		*flags &= ~CLI_CRED_NTLM2;
+	} else if (*flags & CLI_CRED_NTLMv2_AUTH) {
+
+		if (!target_info.length) {
+			/* be lazy, match win2k - we can't do NTLMv2 without it */
+			DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
+			TALLOC_FREE(frame);
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+
+		/* TODO: if the remote server is standalone, then we should replace 'domain'
+		   with the server name as supplied above */
+		
+		if (!SMBNTLMv2encrypt_hash(frame,
+					   user, 
+					   domain, 
+					   nt_hash->hash, &challenge, 
+					   server_timestamp, &target_info,
+					   &lm_response, &nt_response, 
+					   NULL, &session_key)) {
+			TALLOC_FREE(frame);
+			return NT_STATUS_NO_MEMORY;
+		}
+
+		/* LM Key is incompatible... */
+		*flags &= ~CLI_CRED_LANMAN_AUTH;
+		if (lm_response.length != 0) {
+			/*
+			 * We should not expose the lm key.
+			 */
+			memset(lm_response.data, 0, lm_response.length);
+		}
+	} else if (*flags & CLI_CRED_NTLM2) {
+		uint8_t session_nonce[16];
+		uint8_t session_nonce_hash[16];
+		uint8_t user_session_key[16];
+
+		lm_response = data_blob_talloc_zero(frame, 24);
+		if (lm_response.data == NULL) {
+			TALLOC_FREE(frame);
+			return NT_STATUS_NO_MEMORY;
+		}
+		generate_random_buffer(lm_response.data, 8);
+
+		memcpy(session_nonce, challenge.data, 8);
+		memcpy(&session_nonce[8], lm_response.data, 8);
+
+		rc = gnutls_hash_fast(GNUTLS_DIG_MD5,
+				      session_nonce,
+				      sizeof(session_nonce),
+				      session_nonce_hash);
+		if (rc < 0) {
+			return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
+		}
+
+		DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
+		DEBUG(5, ("challenge is: \n"));
+		dump_data(5, session_nonce_hash, 8);
+
+		nt_response = data_blob_talloc_zero(frame, 24);
+		if (nt_response.data == NULL) {
+			TALLOC_FREE(frame);
+			return NT_STATUS_NO_MEMORY;
+		}
+		rc = SMBOWFencrypt(nt_hash->hash,
+				   session_nonce_hash,
+                                   nt_response.data);
+		if (rc != 0) {
+			TALLOC_FREE(frame);
+			return gnutls_error_to_ntstatus(rc, NT_STATUS_ACCESS_DISABLED_BY_POLICY_OTHER);
+		}
+
+		ZERO_ARRAY(session_nonce_hash);
+
+		session_key = data_blob_talloc_zero(frame, 16);
+		if (session_key.data == NULL) {
+			TALLOC_FREE(frame);
+			return NT_STATUS_NO_MEMORY;
+		}
+
+		SMBsesskeygen_ntv1(nt_hash->hash, user_session_key);
+
+		rc = gnutls_hmac_fast(GNUTLS_MAC_MD5,
+				      user_session_key,
+				      sizeof(user_session_key),
+				      session_nonce,
+				      sizeof(session_nonce),
+				      session_key.data);
+		if (rc < 0) {
+			return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
+		}
+
+		ZERO_ARRAY(user_session_key);
+
+		dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
+
+		/* LM Key is incompatible... */
+		*flags &= ~CLI_CRED_LANMAN_AUTH;
+	} else {
+		const char *password = cli_credentials_get_password(cred);
+		uint8_t lm_hash[16];
+		bool do_lm = false;
+
+		nt_response = data_blob_talloc_zero(frame, 24);
+		if (nt_response.data == NULL) {
+			TALLOC_FREE(frame);
+			return NT_STATUS_NO_MEMORY;
+		}
+		rc = SMBOWFencrypt(nt_hash->hash, challenge.data,
+				   nt_response.data);
+		if (rc != 0) {
+			TALLOC_FREE(frame);
+			return gnutls_error_to_ntstatus(rc, NT_STATUS_ACCESS_DISABLED_BY_POLICY_OTHER);
+		}
+
+		session_key = data_blob_talloc_zero(frame, 16);
+		if (session_key.data == NULL) {
+			TALLOC_FREE(frame);
+			return NT_STATUS_NO_MEMORY;
+		}
+		SMBsesskeygen_ntv1(nt_hash->hash, session_key.data);
+		dump_data_pw("NT session key:\n", session_key.data, session_key.length);
+
+		/* lanman auth is insecure, it may be disabled.  
+		   We may also not have a password */
+
+		if (password != NULL) {
+			do_lm = E_deshash(password, lm_hash);
+		}
+
+		if (*flags & CLI_CRED_LANMAN_AUTH && do_lm) {
+			lm_response = data_blob_talloc_zero(frame, 24);
+			if (lm_response.data == NULL) {
+				ZERO_STRUCT(lm_hash);
+				TALLOC_FREE(frame);
+				return NT_STATUS_NO_MEMORY;
+			}
+
+			rc = SMBencrypt_hash(lm_hash,
+					     challenge.data,
+					     lm_response.data);
+			if (rc != 0) {
+				ZERO_STRUCT(lm_hash);
+				TALLOC_FREE(frame);
+				return gnutls_error_to_ntstatus(rc, NT_STATUS_ACCESS_DISABLED_BY_POLICY_OTHER);
+			}
+		} else {
+			/* just copy the nt_response */
+			lm_response = data_blob_dup_talloc(frame, nt_response);
+			if (lm_response.data == NULL) {
+				ZERO_STRUCT(lm_hash);
+				TALLOC_FREE(frame);
+				return NT_STATUS_NO_MEMORY;
+			}
+		}
+
+		if (do_lm) {
+			lm_session_key = data_blob_talloc_zero(frame, 16);
+			if (lm_session_key.data == NULL) {
+				ZERO_STRUCT(lm_hash);
+				TALLOC_FREE(frame);
+				return NT_STATUS_NO_MEMORY;
+			}
+			memcpy(lm_session_key.data, lm_hash, 8);
+
+			if (!(*flags & CLI_CRED_NTLM_AUTH)) {
+				memcpy(session_key.data, lm_session_key.data, 16);
+			}
+			ZERO_STRUCT(lm_hash);
+		}
+	}
+
+done:
+	if (_lm_response != NULL) {
+		talloc_steal(mem_ctx, lm_response.data);
+		*_lm_response = lm_response;
+	} else {
+		data_blob_clear(&lm_response);
+	}
+	if (_nt_response != NULL) {
+		talloc_steal(mem_ctx, nt_response.data);
+		*_nt_response = nt_response;
+	} else {
+		data_blob_clear(&nt_response);
+	}
+	if (_lm_session_key != NULL) {
+		talloc_steal(mem_ctx, lm_session_key.data);
+		*_lm_session_key = lm_session_key;
+	} else {
+		data_blob_clear(&lm_session_key);
+	}
+	if (_session_key != NULL) {
+		talloc_steal(mem_ctx, session_key.data);
+		*_session_key = session_key;
+	} else {
+		data_blob_clear(&session_key);
+	}
+	TALLOC_FREE(frame);
+	return NT_STATUS_OK;
+}
+
+/*
+ * Set a utf16 password on the credentials context, including an indication
+ * of 'how' the password was obtained
+ *
+ * This is required because the nt_hash is calculated over the raw utf16 blob,
+ * which might not be completely valid utf16, which means the conversion
+ * from CH_UTF16MUNGED to CH_UTF8 might loose information.
+ */
+_PUBLIC_ bool cli_credentials_set_utf16_password(struct cli_credentials *cred,
+						 const DATA_BLOB *password_utf16,
+						 enum credentials_obtained obtained)
+{
+	cred->password_will_be_nt_hash = false;
+
+	if (password_utf16 == NULL) {
+		return cli_credentials_set_password(cred, NULL, obtained);
+	}
+
+	if (obtained >= cred->password_obtained) {
+		struct samr_Password *nt_hash = NULL;
+		char *password_talloc = NULL;
+		size_t password_len = 0;
+		bool ok;
+
+		nt_hash = talloc(cred, struct samr_Password);
+		if (nt_hash == NULL) {
+			return false;
+		}
+
+		ok = convert_string_talloc(cred,
+					   CH_UTF16MUNGED, CH_UTF8,
+					   password_utf16->data,
+					   password_utf16->length,
+					   (void *)&password_talloc,
+					   &password_len);
+		if (!ok) {
+			TALLOC_FREE(nt_hash);
+			return false;
+		}
+
+		ok = cli_credentials_set_password(cred, password_talloc, obtained);
+		TALLOC_FREE(password_talloc);
+		if (!ok) {
+			TALLOC_FREE(nt_hash);
+			return false;
+		}
+
+		mdfour(nt_hash->hash, password_utf16->data, password_utf16->length);
+		cred->nt_hash = nt_hash;
+		return true;
+	}
+
+	return false;
+}
+
+/*
+ * Set a old utf16 password on the credentials context.
+ *
+ * This is required because the nt_hash is calculated over the raw utf16 blob,
+ * which might not be completely valid utf16, which means the conversion
+ * from CH_UTF16MUNGED to CH_UTF8 might loose information.
+ */
+_PUBLIC_ bool cli_credentials_set_old_utf16_password(struct cli_credentials *cred,
+						     const DATA_BLOB *password_utf16)
+{
+	struct samr_Password *nt_hash = NULL;
+	char *password_talloc = NULL;
+	size_t password_len = 0;
+	bool ok;
+
+	if (password_utf16 == NULL) {
+		return cli_credentials_set_old_password(cred, NULL, CRED_SPECIFIED);
+	}
+
+	nt_hash = talloc(cred, struct samr_Password);
+	if (nt_hash == NULL) {
+		return false;
+	}
+
+	ok = convert_string_talloc(cred,
+				   CH_UTF16MUNGED, CH_UTF8,
+				   password_utf16->data,
+				   password_utf16->length,
+				   (void *)&password_talloc,
+				   &password_len);
+	if (!ok) {
+		TALLOC_FREE(nt_hash);
+		return false;
+	}
+
+	ok = cli_credentials_set_old_password(cred, password_talloc, CRED_SPECIFIED);
+	TALLOC_FREE(password_talloc);
+	if (!ok) {
+		TALLOC_FREE(nt_hash);
+		return false;
+	}
+
+	mdfour(nt_hash->hash, password_utf16->data, password_utf16->length);
+	cred->old_nt_hash = nt_hash;
+	return true;
+}
+
+_PUBLIC_ void cli_credentials_set_password_will_be_nt_hash(struct cli_credentials *cred,
+							   bool val)
+{
+	/*
+	 * We set this here and the next cli_credentials_set_password()
+	 * that resets the password or password callback
+	 * will pick this up.
+	 *
+	 * cli_credentials_set_nt_hash() and
+	 * cli_credentials_set_utf16_password() will reset this
+	 * to false.
+	 */
+	cred->password_will_be_nt_hash = val;
+}
+
+_PUBLIC_ bool cli_credentials_set_nt_hash(struct cli_credentials *cred,
+				 const struct samr_Password *nt_hash, 
+				 enum credentials_obtained obtained)
+{
+	cred->password_will_be_nt_hash = false;
+
+	if (obtained >= cred->password_obtained) {
+		cli_credentials_set_password(cred, NULL, obtained);
+		if (nt_hash) {
+			cred->nt_hash = talloc(cred, struct samr_Password);
+			if (cred->nt_hash == NULL) {
+				return false;
+			}
+			*cred->nt_hash = *nt_hash;
+		} else {
+			cred->nt_hash = NULL;
+		}
+		return true;
+	}
+
+	return false;
+}
+
+_PUBLIC_ bool cli_credentials_set_old_nt_hash(struct cli_credentials *cred,
+					      const struct samr_Password *nt_hash)
+{
+	cli_credentials_set_old_password(cred, NULL, CRED_SPECIFIED);
+	if (nt_hash) {
+		cred->old_nt_hash = talloc(cred, struct samr_Password);
+		if (cred->old_nt_hash == NULL) {
+			return false;
+		}
+		*cred->old_nt_hash = *nt_hash;
+	} else {
+		cred->old_nt_hash = NULL;
+	}
+
+	return true;
+}
+
+_PUBLIC_ bool cli_credentials_set_ntlm_response(struct cli_credentials *cred,
+						const DATA_BLOB *lm_response,
+						const DATA_BLOB *lm_session_key,
+						const DATA_BLOB *nt_response,
+						const DATA_BLOB *nt_session_key,
+						enum credentials_obtained obtained)
+{
+	if (obtained >= cred->password_obtained) {
+		cli_credentials_set_password(cred, NULL, obtained);
+
+		data_blob_clear_free(&cred->lm_response);
+		data_blob_clear_free(&cred->lm_session_key);
+		data_blob_clear_free(&cred->nt_response);
+		data_blob_clear_free(&cred->nt_session_key);
+
+		if (lm_response != NULL && lm_response->length != 0) {
+			cred->lm_response = data_blob_talloc(cred,
+							lm_response->data,
+							lm_response->length);
+			if (cred->lm_response.data == NULL) {
+				return false;
+			}
+		}
+		if (lm_session_key != NULL && lm_session_key->length != 0) {
+			cred->lm_session_key = data_blob_talloc(cred,
+							lm_session_key->data,
+							lm_session_key->length);
+			if (cred->lm_session_key.data == NULL) {
+				return false;
+			}
+		}
+
+		if (nt_response != NULL && nt_response->length != 0) {
+			cred->nt_response = data_blob_talloc(cred,
+							nt_response->data,
+							nt_response->length);
+			if (cred->nt_response.data == NULL) {
+				return false;
+			}
+		}
+		if (nt_session_key != NULL && nt_session_key->length != 0) {
+			cred->nt_session_key = data_blob_talloc(cred,
+							nt_session_key->data,
+							nt_session_key->length);
+			if (cred->nt_session_key.data == NULL) {
+				return false;
+			}
+		}
+
+		return true;
+	}
+
+	return false;
+}
+