+++ /dev/null
-/*
- Unix SMB/CIFS implementation.
- code to manipulate domain credentials
- Copyright (C) Andrew Tridgell 1997-1998
- Largely rewritten by Jeremy Allison 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 "../lib/crypto/crypto.h"
-#include "libcli/auth/libcli_auth.h"
-
-/****************************************************************************
- Represent a credential as a string.
-****************************************************************************/
-
-char *credstr(const unsigned char *cred)
-{
- char *result;
- result = talloc_asprintf(talloc_tos(),
- "%02X%02X%02X%02X%02X%02X%02X%02X",
- cred[0], cred[1], cred[2], cred[3],
- cred[4], cred[5], cred[6], cred[7]);
- SMB_ASSERT(result != NULL);
- return result;
-}
-
-/****************************************************************************
- Setup the session key and the client and server creds in dc.
- ADS-style 128 bit session keys.
- Used by both client and server creds setup.
-****************************************************************************/
-
-static void creds_init_128(struct dcinfo *dc,
- const struct netr_Credential *clnt_chal_in,
- const struct netr_Credential *srv_chal_in,
- const unsigned char mach_pw[16])
-{
- unsigned char zero[4], tmp[16];
- HMACMD5Context ctx;
- struct MD5Context md5;
-
- /* Just in case this isn't already there */
- memcpy(dc->mach_pw, mach_pw, 16);
-
- ZERO_STRUCT(dc->sess_key);
-
- memset(zero, 0, sizeof(zero));
-
- hmac_md5_init_rfc2104(mach_pw, 16, &ctx);
- MD5Init(&md5);
- MD5Update(&md5, zero, sizeof(zero));
- MD5Update(&md5, clnt_chal_in->data, 8);
- MD5Update(&md5, srv_chal_in->data, 8);
- MD5Final(tmp, &md5);
- hmac_md5_update(tmp, sizeof(tmp), &ctx);
- hmac_md5_final(dc->sess_key, &ctx);
-
- /* debug output */
- DEBUG(5,("creds_init_128\n"));
- DEBUG(5,("\tclnt_chal_in: %s\n", credstr(clnt_chal_in->data)));
- DEBUG(5,("\tsrv_chal_in : %s\n", credstr(srv_chal_in->data)));
- dump_data_pw("\tsession_key ", (const unsigned char *)dc->sess_key, 16);
-
- /* Generate the next client and server creds. */
-
- des_crypt112(dc->clnt_chal.data, /* output */
- clnt_chal_in->data, /* input */
- dc->sess_key, /* input */
- 1);
-
- des_crypt112(dc->srv_chal.data, /* output */
- srv_chal_in->data, /* input */
- dc->sess_key, /* input */
- 1);
-
- /* Seed is the client chal. */
- memcpy(dc->seed_chal.data, dc->clnt_chal.data, 8);
-}
-
-/****************************************************************************
- Setup the session key and the client and server creds in dc.
- Used by both client and server creds setup.
-****************************************************************************/
-
-static void creds_init_64(struct dcinfo *dc,
- const struct netr_Credential *clnt_chal_in,
- const struct netr_Credential *srv_chal_in,
- const unsigned char mach_pw[16])
-{
- uint32 sum[2];
- unsigned char sum2[8];
-
- /* Just in case this isn't already there */
- memcpy(dc->mach_pw, mach_pw, 16);
-
- sum[0] = IVAL(clnt_chal_in->data, 0) + IVAL(srv_chal_in->data, 0);
- sum[1] = IVAL(clnt_chal_in->data, 4) + IVAL(srv_chal_in->data, 4);
-
- SIVAL(sum2,0,sum[0]);
- SIVAL(sum2,4,sum[1]);
-
- ZERO_STRUCT(dc->sess_key);
-
- des_crypt128(dc->sess_key, sum2, dc->mach_pw);
-
- /* debug output */
- DEBUG(5,("creds_init_64\n"));
- DEBUG(5,("\tclnt_chal_in: %s\n", credstr(clnt_chal_in->data)));
- DEBUG(5,("\tsrv_chal_in : %s\n", credstr(srv_chal_in->data)));
- DEBUG(5,("\tclnt+srv : %s\n", credstr(sum2)));
- DEBUG(5,("\tsess_key_out : %s\n", credstr(dc->sess_key)));
-
- /* Generate the next client and server creds. */
-
- des_crypt112(dc->clnt_chal.data, /* output */
- clnt_chal_in->data, /* input */
- dc->sess_key, /* input */
- 1);
-
- des_crypt112(dc->srv_chal.data, /* output */
- srv_chal_in->data, /* input */
- dc->sess_key, /* input */
- 1);
-
- /* Seed is the client chal. */
- memcpy(dc->seed_chal.data, dc->clnt_chal.data, 8);
-}
-
-/****************************************************************************
- Utility function to step credential chain one forward.
- Deliberately doesn't update the seed. See reseed comment below.
-****************************************************************************/
-
-static void creds_step(struct dcinfo *dc)
-{
- struct netr_Credential time_chal;
-
- DEBUG(5,("\tsequence = 0x%x\n", (unsigned int)dc->sequence ));
-
- DEBUG(5,("\tseed: %s\n", credstr(dc->seed_chal.data) ));
-
- SIVAL(time_chal.data, 0, IVAL(dc->seed_chal.data, 0) + dc->sequence);
- SIVAL(time_chal.data, 4, IVAL(dc->seed_chal.data, 4));
-
- DEBUG(5,("\tseed+seq %s\n", credstr(time_chal.data) ));
-
- des_crypt112(dc->clnt_chal.data, time_chal.data, dc->sess_key, 1);
-
- DEBUG(5,("\tCLIENT %s\n", credstr(dc->clnt_chal.data) ));
-
- SIVAL(time_chal.data, 0, IVAL(dc->seed_chal.data, 0) + dc->sequence + 1);
- SIVAL(time_chal.data, 4, IVAL(dc->seed_chal.data, 4));
-
- DEBUG(5,("\tseed+seq+1 %s\n", credstr(time_chal.data) ));
-
- des_crypt112(dc->srv_chal.data, time_chal.data, dc->sess_key, 1);
-
- DEBUG(5,("\tSERVER %s\n", credstr(dc->srv_chal.data) ));
-}
-
-/****************************************************************************
- Create a server credential struct.
-****************************************************************************/
-
-void creds_server_init(uint32 neg_flags,
- struct dcinfo *dc,
- struct netr_Credential *clnt_chal,
- struct netr_Credential *srv_chal,
- const unsigned char mach_pw[16],
- struct netr_Credential *init_chal_out)
-{
- DEBUG(10,("creds_server_init: neg_flags : %x\n", (unsigned int)neg_flags));
- DEBUG(10,("creds_server_init: client chal : %s\n", credstr(clnt_chal->data) ));
- DEBUG(10,("creds_server_init: server chal : %s\n", credstr(srv_chal->data) ));
- dump_data_pw("creds_server_init: machine pass", mach_pw, 16);
-
- /* Generate the session key and the next client and server creds. */
- if (neg_flags & NETLOGON_NEG_128BIT) {
- creds_init_128(dc,
- clnt_chal,
- srv_chal,
- mach_pw);
- } else {
- creds_init_64(dc,
- clnt_chal,
- srv_chal,
- mach_pw);
- }
-
- dump_data_pw("creds_server_init: session key", dc->sess_key, 16);
-
- DEBUG(10,("creds_server_init: clnt : %s\n", credstr(dc->clnt_chal.data) ));
- DEBUG(10,("creds_server_init: server : %s\n", credstr(dc->srv_chal.data) ));
- DEBUG(10,("creds_server_init: seed : %s\n", credstr(dc->seed_chal.data) ));
-
- memcpy(init_chal_out->data, dc->srv_chal.data, 8);
-}
-
-/****************************************************************************
- Check a credential sent by the client.
-****************************************************************************/
-
-bool netlogon_creds_server_check(const struct dcinfo *dc,
- const struct netr_Credential *rcv_cli_chal_in)
-{
- if (memcmp(dc->clnt_chal.data, rcv_cli_chal_in->data, 8)) {
- DEBUG(5,("netlogon_creds_server_check: challenge : %s\n",
- credstr(rcv_cli_chal_in->data)));
- DEBUG(5,("calculated: %s\n", credstr(dc->clnt_chal.data)));
- DEBUG(2,("netlogon_creds_server_check: credentials check failed.\n"));
- return false;
- }
-
- DEBUG(10,("netlogon_creds_server_check: credentials check OK.\n"));
-
- return true;
-}
-/****************************************************************************
- Replace current seed chal. Internal function - due to split server step below.
-****************************************************************************/
-
-static void creds_reseed(struct dcinfo *dc)
-{
- struct netr_Credential time_chal;
-
- SIVAL(time_chal.data, 0, IVAL(dc->seed_chal.data, 0) + dc->sequence + 1);
- SIVAL(time_chal.data, 4, IVAL(dc->seed_chal.data, 4));
-
- dc->seed_chal = time_chal;
-
- DEBUG(5,("cred_reseed: seed %s\n", credstr(dc->seed_chal.data) ));
-}
-
-/****************************************************************************
- Step the server credential chain one forward.
-****************************************************************************/
-
-bool netlogon_creds_server_step(struct dcinfo *dc,
- const struct netr_Authenticator *received_cred,
- struct netr_Authenticator *cred_out)
-{
- bool ret;
- struct dcinfo tmp_dc = *dc;
-
- if (!received_cred || !cred_out) {
- return false;
- }
-
- /* Do all operations on a temporary copy of the dc,
- which we throw away if the checks fail. */
-
- tmp_dc.sequence = received_cred->timestamp;
-
- creds_step(&tmp_dc);
-
- /* Create the outgoing credentials */
- cred_out->timestamp = tmp_dc.sequence + 1;
- memcpy(&cred_out->cred, &tmp_dc.srv_chal, sizeof(cred_out->cred));
-
- creds_reseed(&tmp_dc);
-
- ret = netlogon_creds_server_check(&tmp_dc, &received_cred->cred);
- if (!ret) {
- return false;
- }
-
- /* creds step succeeded - replace the current creds. */
- *dc = tmp_dc;
- return true;
-}
-
-void cred_hash3(unsigned char *out, const unsigned char *in, const unsigned char *key, int forw)
-{
- unsigned char key2[8];
-
- memset(key2,'\0',8);
- des_crypt56(out, in, key, forw);
- key2[0] = key[7];
- des_crypt56(out + 8, in + 8, key2, forw);
-}
git.samba.org / abartlet / samba.git / .git / commitdiff