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-rw-r--r--auth/credentials/credentials_ntlm.c256
1 files changed, 256 insertions, 0 deletions
diff --git a/auth/credentials/credentials_ntlm.c b/auth/credentials/credentials_ntlm.c
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+++ b/auth/credentials/credentials_ntlm.c
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+/*
+ 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"
+
+_PUBLIC_ NTSTATUS cli_credentials_get_ntlm_response(struct cli_credentials *cred, TALLOC_CTX *mem_ctx,
+ int *flags,
+ DATA_BLOB challenge, DATA_BLOB target_info,
+ DATA_BLOB *_lm_response, DATA_BLOB *_nt_response,
+ DATA_BLOB *_lm_session_key, DATA_BLOB *_session_key)
+{
+ const char *user, *domain;
+ DATA_BLOB lm_response, nt_response;
+ DATA_BLOB lm_session_key, session_key;
+ const struct samr_Password *nt_hash;
+ lm_session_key = data_blob(NULL, 0);
+
+ /* 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) {
+ *_nt_response = cred->nt_response;
+ *_lm_response = cred->lm_response;
+
+ if (!cred->lm_response.data) {
+ *flags = *flags & ~CLI_CRED_LANMAN_AUTH;
+ }
+ *_lm_session_key = data_blob(NULL, 0);
+ *_session_key = data_blob(NULL, 0);
+ return NT_STATUS_OK;
+ }
+
+ nt_hash = cli_credentials_get_nt_hash(cred, mem_ctx);
+
+ cli_credentials_get_ntlm_username_domain(cred, mem_ctx, &user, &domain);
+
+ /* 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 (cred->use_kerberos == CRED_MUST_USE_KERBEROS) {
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ if (!nt_hash) {
+ static const uint8_t zeros[16];
+ /* do nothing - blobs are zero length */
+
+ /* session key is all zeros */
+ session_key = data_blob_talloc(mem_ctx, zeros, 16);
+ lm_session_key = data_blob_talloc(mem_ctx, zeros, 16);
+
+ lm_response = data_blob(NULL, 0);
+ nt_response = data_blob(NULL, 0);
+
+ /* 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"));
+ 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(mem_ctx,
+ user,
+ domain,
+ nt_hash->hash, &challenge,
+ &target_info,
+ &lm_response, &nt_response,
+ NULL, &session_key)) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ /* LM Key is incompatible... */
+ *flags &= ~CLI_CRED_LANMAN_AUTH;
+ } else if (*flags & CLI_CRED_NTLM2) {
+ struct MD5Context md5_session_nonce_ctx;
+ uint8_t session_nonce[16];
+ uint8_t session_nonce_hash[16];
+ uint8_t user_session_key[16];
+
+ lm_response = data_blob_talloc(mem_ctx, NULL, 24);
+ generate_random_buffer(lm_response.data, 8);
+ memset(lm_response.data+8, 0, 16);
+
+ memcpy(session_nonce, challenge.data, 8);
+ memcpy(&session_nonce[8], lm_response.data, 8);
+
+ MD5Init(&md5_session_nonce_ctx);
+ MD5Update(&md5_session_nonce_ctx, challenge.data, 8);
+ MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
+ MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
+
+ 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(mem_ctx, NULL, 24);
+ SMBOWFencrypt(nt_hash->hash,
+ session_nonce_hash,
+ nt_response.data);
+
+ session_key = data_blob_talloc(mem_ctx, NULL, 16);
+
+ SMBsesskeygen_ntv1(nt_hash->hash, user_session_key);
+ hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
+ dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
+
+ /* LM Key is incompatible... */
+ *flags &= ~CLI_CRED_LANMAN_AUTH;
+ } else {
+ uint8_t lm_hash[16];
+ nt_response = data_blob_talloc(mem_ctx, NULL, 24);
+ SMBOWFencrypt(nt_hash->hash, challenge.data,
+ nt_response.data);
+
+ session_key = data_blob_talloc(mem_ctx, NULL, 16);
+ 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 (*flags & CLI_CRED_LANMAN_AUTH) {
+ const char *password;
+ password = cli_credentials_get_password(cred);
+ if (!password) {
+ lm_response = nt_response;
+ } else {
+ lm_response = data_blob_talloc(mem_ctx, NULL, 24);
+ if (!SMBencrypt(password,challenge.data,
+ lm_response.data)) {
+ /* If the LM password was too long (and therefore the LM hash being
+ of the first 14 chars only), don't send it.
+
+ We don't have any better options but to send the NT response
+ */
+ data_blob_free(&lm_response);
+ lm_response = nt_response;
+ /* LM Key is incompatible with 'long' passwords */
+ *flags &= ~CLI_CRED_LANMAN_AUTH;
+ } else {
+ E_deshash(password, lm_hash);
+ lm_session_key = data_blob_talloc(mem_ctx, NULL, 16);
+ memcpy(lm_session_key.data, lm_hash, 8);
+ memset(&lm_session_key.data[8], '\0', 8);
+
+ if (!(*flags & CLI_CRED_NTLM_AUTH)) {
+ session_key = lm_session_key;
+ }
+ }
+ }
+ } else {
+ const char *password;
+
+ /* LM Key is incompatible... */
+ lm_response = nt_response;
+ *flags &= ~CLI_CRED_LANMAN_AUTH;
+
+ password = cli_credentials_get_password(cred);
+ if (password) {
+ E_deshash(password, lm_hash);
+ lm_session_key = data_blob_talloc(mem_ctx, NULL, 16);
+ memcpy(lm_session_key.data, lm_hash, 8);
+ memset(&lm_session_key.data[8], '\0', 8);
+ }
+ }
+ }
+ if (_lm_response) {
+ *_lm_response = lm_response;
+ }
+ if (_nt_response) {
+ *_nt_response = nt_response;
+ }
+ if (_lm_session_key) {
+ *_lm_session_key = lm_session_key;
+ }
+ if (_session_key) {
+ *_session_key = session_key;
+ }
+ return NT_STATUS_OK;
+}
+
+_PUBLIC_ bool cli_credentials_set_nt_hash(struct cli_credentials *cred,
+ const struct samr_Password *nt_hash,
+ enum credentials_obtained obtained)
+{
+ if (obtained >= cred->password_obtained) {
+ cli_credentials_set_password(cred, NULL, obtained);
+ if (nt_hash) {
+ cred->nt_hash = talloc(cred, struct samr_Password);
+ *cred->nt_hash = *nt_hash;
+ } else {
+ cred->nt_hash = NULL;
+ }
+ return true;
+ }
+
+ return false;
+}
+
+_PUBLIC_ bool cli_credentials_set_ntlm_response(struct cli_credentials *cred,
+ const DATA_BLOB *lm_response,
+ const DATA_BLOB *nt_response,
+ enum credentials_obtained obtained)
+{
+ if (obtained >= cred->password_obtained) {
+ cli_credentials_set_password(cred, NULL, obtained);
+ if (nt_response) {
+ cred->nt_response = data_blob_talloc(cred, nt_response->data, nt_response->length);
+ talloc_steal(cred, cred->nt_response.data);
+ }
+ if (nt_response) {
+ cred->lm_response = data_blob_talloc(cred, lm_response->data, lm_response->length);
+ }
+ return true;
+ }
+
+ return false;
+}
+
generated by cgit (git 2.34.1) at 2024-06-21 20:07:21 +0000