Move libcli/auth to the top level

1 files changed, 375 insertions, 0 deletions

diff --git a/libcli/auth/credentials.c b/libcli/auth/credentials.c
new file mode 100644
index 0000000000..3c77b0836d
--- /dev/null
+++ b/libcli/auth/credentials.c
@@ -0,0 +1,375 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   code to manipulate domain credentials
+
+   Copyright (C) Andrew Tridgell 1997-2003
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
+   
+   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 "system/time.h"
+#include "auth/auth.h"
+#include "../lib/crypto/crypto.h"
+#include "libcli/auth/libcli_auth.h"
+
+/*
+  initialise the credentials state for old-style 64 bit session keys
+
+  this call is made after the netr_ServerReqChallenge call
+*/
+static void creds_init_64bit(struct creds_CredentialState *creds,
+			     const struct netr_Credential *client_challenge,
+			     const struct netr_Credential *server_challenge,
+			     const struct samr_Password *machine_password)
+{
+	uint32_t sum[2];
+	uint8_t sum2[8];
+
+	sum[0] = IVAL(client_challenge->data, 0) + IVAL(server_challenge->data, 0);
+	sum[1] = IVAL(client_challenge->data, 4) + IVAL(server_challenge->data, 4);
+
+	SIVAL(sum2,0,sum[0]);
+	SIVAL(sum2,4,sum[1]);
+
+	ZERO_STRUCT(creds->session_key);
+
+	des_crypt128(creds->session_key, sum2, machine_password->hash);
+
+	des_crypt112(creds->client.data, client_challenge->data, creds->session_key, 1);
+	des_crypt112(creds->server.data, server_challenge->data, creds->session_key, 1);
+
+	creds->seed = creds->client;
+}
+
+/*
+  initialise the credentials state for ADS-style 128 bit session keys
+
+  this call is made after the netr_ServerReqChallenge call
+*/
+static void creds_init_128bit(struct creds_CredentialState *creds,
+			      const struct netr_Credential *client_challenge,
+			      const struct netr_Credential *server_challenge,
+			      const struct samr_Password *machine_password)
+{
+	unsigned char zero[4], tmp[16];
+	HMACMD5Context ctx;
+	struct MD5Context md5;
+
+	ZERO_STRUCT(creds->session_key);
+
+	memset(zero, 0, sizeof(zero));
+
+	hmac_md5_init_rfc2104(machine_password->hash, sizeof(machine_password->hash), &ctx);	
+	MD5Init(&md5);
+	MD5Update(&md5, zero, sizeof(zero));
+	MD5Update(&md5, client_challenge->data, 8);
+	MD5Update(&md5, server_challenge->data, 8);
+	MD5Final(tmp, &md5);
+	hmac_md5_update(tmp, sizeof(tmp), &ctx);
+	hmac_md5_final(creds->session_key, &ctx);
+
+	creds->client = *client_challenge;
+	creds->server = *server_challenge;
+
+	des_crypt112(creds->client.data, client_challenge->data, creds->session_key, 1);
+	des_crypt112(creds->server.data, server_challenge->data, creds->session_key, 1);
+
+	creds->seed = creds->client;
+}
+
+
+/*
+  step the credentials to the next element in the chain, updating the
+  current client and server credentials and the seed
+*/
+static void creds_step(struct creds_CredentialState *creds)
+{
+	struct netr_Credential time_cred;
+
+	DEBUG(5,("\tseed        %08x:%08x\n", 
+		 IVAL(creds->seed.data, 0), IVAL(creds->seed.data, 4)));
+
+	SIVAL(time_cred.data, 0, IVAL(creds->seed.data, 0) + creds->sequence);
+	SIVAL(time_cred.data, 4, IVAL(creds->seed.data, 4));
+
+	DEBUG(5,("\tseed+time   %08x:%08x\n", IVAL(time_cred.data, 0), IVAL(time_cred.data, 4)));
+
+	des_crypt112(creds->client.data, time_cred.data, creds->session_key, 1);
+
+	DEBUG(5,("\tCLIENT      %08x:%08x\n", 
+		 IVAL(creds->client.data, 0), IVAL(creds->client.data, 4)));
+
+	SIVAL(time_cred.data, 0, IVAL(creds->seed.data, 0) + creds->sequence + 1);
+	SIVAL(time_cred.data, 4, IVAL(creds->seed.data, 4));
+
+	DEBUG(5,("\tseed+time+1 %08x:%08x\n", 
+		 IVAL(time_cred.data, 0), IVAL(time_cred.data, 4)));
+
+	des_crypt112(creds->server.data, time_cred.data, creds->session_key, 1);
+
+	DEBUG(5,("\tSERVER      %08x:%08x\n", 
+		 IVAL(creds->server.data, 0), IVAL(creds->server.data, 4)));
+
+	creds->seed = time_cred;
+}
+
+
+/*
+  DES encrypt a 8 byte LMSessionKey buffer using the Netlogon session key
+*/
+void creds_des_encrypt_LMKey(struct creds_CredentialState *creds, struct netr_LMSessionKey *key)
+{
+	struct netr_LMSessionKey tmp;
+	des_crypt56(tmp.key, key->key, creds->session_key, 1);
+	*key = tmp;
+}
+
+/*
+  DES decrypt a 8 byte LMSessionKey buffer using the Netlogon session key
+*/
+void creds_des_decrypt_LMKey(struct creds_CredentialState *creds, struct netr_LMSessionKey *key)
+{
+	struct netr_LMSessionKey tmp;
+	des_crypt56(tmp.key, key->key, creds->session_key, 0);
+	*key = tmp;
+}
+
+/*
+  DES encrypt a 16 byte password buffer using the session key
+*/
+void creds_des_encrypt(struct creds_CredentialState *creds, struct samr_Password *pass)
+{
+	struct samr_Password tmp;
+	des_crypt112_16(tmp.hash, pass->hash, creds->session_key, 1);
+	*pass = tmp;
+}
+
+/*
+  DES decrypt a 16 byte password buffer using the session key
+*/
+void creds_des_decrypt(struct creds_CredentialState *creds, struct samr_Password *pass)
+{
+	struct samr_Password tmp;
+	des_crypt112_16(tmp.hash, pass->hash, creds->session_key, 0);
+	*pass = tmp;
+}
+
+/*
+  ARCFOUR encrypt/decrypt a password buffer using the session key
+*/
+void creds_arcfour_crypt(struct creds_CredentialState *creds, uint8_t *data, size_t len)
+{
+	DATA_BLOB session_key = data_blob(creds->session_key, 16);
+
+	arcfour_crypt_blob(data, len, &session_key);
+
+	data_blob_free(&session_key);
+}
+
+/*****************************************************************
+The above functions are common to the client and server interface
+next comes the client specific functions
+******************************************************************/
+
+/*
+  initialise the credentials chain and return the first client
+  credentials
+*/
+void creds_client_init(struct creds_CredentialState *creds,
+		       const struct netr_Credential *client_challenge,
+		       const struct netr_Credential *server_challenge,
+		       const struct samr_Password *machine_password,
+		       struct netr_Credential *initial_credential,
+		       uint32_t negotiate_flags)
+{
+	creds->sequence = time(NULL);
+	creds->negotiate_flags = negotiate_flags;
+
+	dump_data_pw("Client chall", client_challenge->data, sizeof(client_challenge->data));
+	dump_data_pw("Server chall", server_challenge->data, sizeof(server_challenge->data));
+	dump_data_pw("Machine Pass", machine_password->hash, sizeof(machine_password->hash));
+
+	if (negotiate_flags & NETLOGON_NEG_128BIT) {
+		creds_init_128bit(creds, client_challenge, server_challenge, machine_password);
+	} else {
+		creds_init_64bit(creds, client_challenge, server_challenge, machine_password);
+	}
+
+	dump_data_pw("Session key", creds->session_key, 16);
+	dump_data_pw("Credential ", creds->client.data, 8);
+
+	*initial_credential = creds->client;
+}
+
+/*
+  step the credentials to the next element in the chain, updating the
+  current client and server credentials and the seed
+
+  produce the next authenticator in the sequence ready to send to 
+  the server
+*/
+void creds_client_authenticator(struct creds_CredentialState *creds,
+				struct netr_Authenticator *next)
+{	
+	creds->sequence += 2;
+	creds_step(creds);
+
+	next->cred = creds->client;
+	next->timestamp = creds->sequence;
+}
+
+/*
+  check that a credentials reply from a server is correct
+*/
+bool creds_client_check(struct creds_CredentialState *creds,
+			const struct netr_Credential *received_credentials)
+{
+	if (!received_credentials || 
+	    memcmp(received_credentials->data, creds->server.data, 8) != 0) {
+		DEBUG(2,("credentials check failed\n"));
+		return false;
+	}
+	return true;
+}
+
+
+/*****************************************************************
+The above functions are common to the client and server interface
+next comes the server specific functions
+******************************************************************/
+
+/*
+  initialise the credentials chain and return the first server
+  credentials
+*/
+void creds_server_init(struct creds_CredentialState *creds,
+		       const struct netr_Credential *client_challenge,
+		       const struct netr_Credential *server_challenge,
+		       const struct samr_Password *machine_password,
+		       struct netr_Credential *initial_credential,
+		       uint32_t negotiate_flags)
+{
+	if (negotiate_flags & NETLOGON_NEG_128BIT) {
+		creds_init_128bit(creds, client_challenge, server_challenge, 
+				  machine_password);
+	} else {
+		creds_init_64bit(creds, client_challenge, server_challenge, 
+				 machine_password);
+	}
+
+	*initial_credential = creds->server;
+	creds->negotiate_flags = negotiate_flags;
+}
+
+/*
+  check that a credentials reply from a server is correct
+*/
+bool creds_server_check(const struct creds_CredentialState *creds,
+			const struct netr_Credential *received_credentials)
+{
+	if (memcmp(received_credentials->data, creds->client.data, 8) != 0) {
+		DEBUG(2,("credentials check failed\n"));
+		dump_data_pw("client creds", creds->client.data, 8);
+		dump_data_pw("calc   creds", received_credentials->data, 8);
+		return false;
+	}
+	return true;
+}
+
+NTSTATUS creds_server_step_check(struct creds_CredentialState *creds,
+				 struct netr_Authenticator *received_authenticator,
+				 struct netr_Authenticator *return_authenticator) 
+{
+	if (!received_authenticator || !return_authenticator) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	if (!creds) {
+		return NT_STATUS_ACCESS_DENIED;
+	}
+
+	/* TODO: this may allow the a replay attack on a non-signed
+	   connection. Should we check that this is increasing? */
+	creds->sequence = received_authenticator->timestamp;
+	creds_step(creds);
+	if (creds_server_check(creds, &received_authenticator->cred)) {
+		return_authenticator->cred = creds->server;
+		return_authenticator->timestamp = creds->sequence;
+		return NT_STATUS_OK;
+	} else {
+		ZERO_STRUCTP(return_authenticator);
+		return NT_STATUS_ACCESS_DENIED;
+	}
+}
+
+void creds_decrypt_samlogon(struct creds_CredentialState *creds,
+			    uint16_t validation_level,
+			    union netr_Validation *validation) 
+{
+	static const char zeros[16];
+
+	struct netr_SamBaseInfo *base = NULL;
+	switch (validation_level) {
+	case 2:
+		if (validation->sam2) {
+			base = &validation->sam2->base;
+		}
+		break;
+	case 3:
+		if (validation->sam3) {
+			base = &validation->sam3->base;
+		}
+		break;
+	case 6:
+		if (validation->sam6) {
+			base = &validation->sam6->base;
+		}
+		break;
+	default:
+		/* If we can't find it, we can't very well decrypt it */
+		return;
+	}
+
+	if (!base) {
+		return;
+	}
+
+	/* find and decyrpt the session keys, return in parameters above */
+	if (validation_level == 6) {
+		/* they aren't encrypted! */
+	} else if (creds->negotiate_flags & NETLOGON_NEG_ARCFOUR) {
+		if (memcmp(base->key.key, zeros,  
+			   sizeof(base->key.key)) != 0) {
+			creds_arcfour_crypt(creds, 
+					    base->key.key, 
+					    sizeof(base->key.key));
+		}
+			
+		if (memcmp(base->LMSessKey.key, zeros,  
+			   sizeof(base->LMSessKey.key)) != 0) {
+			creds_arcfour_crypt(creds, 
+					    base->LMSessKey.key, 
+					    sizeof(base->LMSessKey.key));
+		}
+	} else {
+		if (memcmp(base->LMSessKey.key, zeros,  
+			   sizeof(base->LMSessKey.key)) != 0) {
+			creds_des_decrypt_LMKey(creds, 
+						&base->LMSessKey);
+		}
+	}
+}